From: Simon Marchi Date: Wed, 22 Sep 2021 01:00:28 +0000 (-0400) Subject: common: compile libconfig as C++ X-Git-Url: https://git.efficios.com/?a=commitdiff_plain;h=3afa94aeca5a0daae40fd7b6cc96b7e4c150c7d8;p=deliverable%2Flttng-tools.git common: compile libconfig as C++ As seen previously, make some global variables that need to be exported non-const. config_element_tracker_pid_target_legacy seems unused and clang gives an unused warning. It was not exposed publicly, so I think it's safe to remove it. Change-Id: I6f9e7d77a7a04b02ae6585383c11389869b4a79a Signed-off-by: Simon Marchi Signed-off-by: Jérémie Galarneau --- diff --git a/src/common/config/Makefile.am b/src/common/config/Makefile.am index aaeeea721..faa4a3835 100644 --- a/src/common/config/Makefile.am +++ b/src/common/config/Makefile.am @@ -2,8 +2,13 @@ noinst_LTLIBRARIES = libconfig.la -libconfig_la_SOURCES = ini.c ini.h session-config.c session-config.h \ - config-session-abi.h config-internal.h +libconfig_la_SOURCES = \ + config-internal.h \ + config-session-abi.h \ + ini.cpp \ + ini.h \ + session-config.cpp \ + session-config.h libconfig_la_CPPFLAGS = $(libxml2_CFLAGS) $(AM_CPPFLAGS) libconfig_la_LIBADD = ${libxml2_LIBS} diff --git a/src/common/config/ini.c b/src/common/config/ini.c deleted file mode 100644 index 1d967a49d..000000000 --- a/src/common/config/ini.c +++ /dev/null @@ -1,218 +0,0 @@ -/* - * inih -- simple .INI file parser - * - * The "inih" library is distributed under the New BSD license: - * - * Copyright (C) 2009 Brush Technology - All rights reserved. - * - * SPDX-License-Identifier: BSD-3-Clause - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions are met: - * - * * Redistributions of source code must retain the above copyright notice, - * this list of conditions and the following disclaimer. - * * Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * * Neither the name of Brush Technology nor the names of its contributors - * may be used to endorse or promote products derived from this software - * without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY BRUSH TECHNOLOGY ''AS IS'' AND ANY EXPRESS OR - * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF - * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO - * EVENT SHALL BRUSH TECHNOLOGY BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, - * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, - * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; - * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, - * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR - * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF - * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - * - * http://code.google.com/p/inih/ - */ - -#include -#include -#include -#include - -#include "ini.h" - -#if !INI_USE_STACK -#include -#endif - -#define MAX_SECTION 50 -#define MAX_NAME 50 - -/* Strip whitespace chars off end of given string, in place. Return s. */ -static char* rstrip(char* s) -{ - char* p = s + strlen(s); - - while (p > s && isspace((unsigned char)(*--p))) - *p = '\0'; - return s; -} - -/* Return pointer to first non-whitespace char in given string. */ -static char* lskip(const char* s) -{ - while (*s && isspace((unsigned char)(*s))) - s++; - return (char*)s; -} - -/* - * Return pointer to first char c or ';' comment in given string, or pointer to - * null at end of string if neither found. ';' must be prefixed by a whitespace - * character to register as a comment. - */ -static char* find_char_or_comment(const char* s, char c) -{ - int was_whitespace = 0; - - while (*s && *s != c && !(was_whitespace && *s == ';')) { - was_whitespace = isspace((unsigned char)(*s)); - s++; - } - return (char*)s; -} - -/* Version of strncpy that ensures dest (size bytes) is null-terminated. */ -static char* strncpy0(char* dest, const char* src, size_t size) -{ - strncpy(dest, src, size - 1); - dest[size - 1] = '\0'; - return dest; -} - -/* See documentation in header file. */ -int ini_parse_file(FILE* file, ini_entry_handler handler, void* user) -{ - /* Uses a fair bit of stack (use heap instead if you need to) */ -#if INI_USE_STACK - char line[INI_MAX_LINE]; -#else - char* line; -#endif - char section[MAX_SECTION] = ""; - char prev_name[MAX_NAME] = ""; - - char* start; - char* end; - char* name; - char* value; - int lineno = 0; - int error = 0; - -#if !INI_USE_STACK - line = (char*)zmalloc(INI_MAX_LINE); - if (!line) { - return -2; - } -#endif - - /* Scan through file line by line */ - while (fgets(line, INI_MAX_LINE, file) != NULL) { - lineno++; - - start = line; -#if INI_ALLOW_BOM - if (lineno == 1 && (unsigned char)start[0] == 0xEF && - (unsigned char)start[1] == 0xBB && - (unsigned char)start[2] == 0xBF) { - start += 3; - } -#endif - start = lskip(rstrip(start)); - - if (*start == ';' || *start == '#') { - /* - * Per Python ConfigParser, allow '#' comments at - * start of line. - */ - } -#if INI_ALLOW_MULTILINE - else if (*prev_name && *start && start > line) { - /* Non-black line with leading whitespace, treat as - * continuation of previous name's value - * (as per Python ConfigParser). - */ - if (handler(user, section, prev_name, start) < 0 && - !error) { - error = lineno; - } - } -#endif - else if (*start == '[') { - /* A "[section]" line */ - end = find_char_or_comment(start + 1, ']'); - if (*end == ']') { - *end = '\0'; - strncpy0(section, start + 1, sizeof(section)); - *prev_name = '\0'; - } - else if (!error) { - /* No ']' found on section line */ - error = lineno; - } - } - else if (*start && *start != ';') { - /* Not a comment, must be a name[=:]value pair */ - end = find_char_or_comment(start, '='); - if (*end != '=') { - end = find_char_or_comment(start, ':'); - } - if (*end == '=' || *end == ':') { - *end = '\0'; - name = rstrip(start); - value = lskip(end + 1); - end = find_char_or_comment(value, '\0'); - if (*end == ';') { - *end = '\0'; - } - - rstrip(value); - - /* - * Valid name[=:]value pair found, call - * handler - */ - strncpy0(prev_name, name, sizeof(prev_name)); - if (handler(user, section, name, value) < 0 && - !error) { - error = lineno; - } - } - else if (!error) { - /* No '=' or ':' found on name[=:]value line */ - error = lineno; - } - } - } - -#if !INI_USE_STACK - free(line); -#endif - - return error; -} - -/* See documentation in header file. */ -int ini_parse(const char* filename, ini_entry_handler handler, void* user) -{ - FILE* file; - int error; - - file = fopen(filename, "r"); - if (!file) { - return -1; - } - - error = ini_parse_file(file, handler, user); - fclose(file); - return error; -} diff --git a/src/common/config/ini.cpp b/src/common/config/ini.cpp new file mode 100644 index 000000000..1d967a49d --- /dev/null +++ b/src/common/config/ini.cpp @@ -0,0 +1,218 @@ +/* + * inih -- simple .INI file parser + * + * The "inih" library is distributed under the New BSD license: + * + * Copyright (C) 2009 Brush Technology - All rights reserved. + * + * SPDX-License-Identifier: BSD-3-Clause + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * + * * Redistributions of source code must retain the above copyright notice, + * this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * * Neither the name of Brush Technology nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY BRUSH TECHNOLOGY ''AS IS'' AND ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO + * EVENT SHALL BRUSH TECHNOLOGY BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, + * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; + * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, + * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR + * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF + * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * http://code.google.com/p/inih/ + */ + +#include +#include +#include +#include + +#include "ini.h" + +#if !INI_USE_STACK +#include +#endif + +#define MAX_SECTION 50 +#define MAX_NAME 50 + +/* Strip whitespace chars off end of given string, in place. Return s. */ +static char* rstrip(char* s) +{ + char* p = s + strlen(s); + + while (p > s && isspace((unsigned char)(*--p))) + *p = '\0'; + return s; +} + +/* Return pointer to first non-whitespace char in given string. */ +static char* lskip(const char* s) +{ + while (*s && isspace((unsigned char)(*s))) + s++; + return (char*)s; +} + +/* + * Return pointer to first char c or ';' comment in given string, or pointer to + * null at end of string if neither found. ';' must be prefixed by a whitespace + * character to register as a comment. + */ +static char* find_char_or_comment(const char* s, char c) +{ + int was_whitespace = 0; + + while (*s && *s != c && !(was_whitespace && *s == ';')) { + was_whitespace = isspace((unsigned char)(*s)); + s++; + } + return (char*)s; +} + +/* Version of strncpy that ensures dest (size bytes) is null-terminated. */ +static char* strncpy0(char* dest, const char* src, size_t size) +{ + strncpy(dest, src, size - 1); + dest[size - 1] = '\0'; + return dest; +} + +/* See documentation in header file. */ +int ini_parse_file(FILE* file, ini_entry_handler handler, void* user) +{ + /* Uses a fair bit of stack (use heap instead if you need to) */ +#if INI_USE_STACK + char line[INI_MAX_LINE]; +#else + char* line; +#endif + char section[MAX_SECTION] = ""; + char prev_name[MAX_NAME] = ""; + + char* start; + char* end; + char* name; + char* value; + int lineno = 0; + int error = 0; + +#if !INI_USE_STACK + line = (char*)zmalloc(INI_MAX_LINE); + if (!line) { + return -2; + } +#endif + + /* Scan through file line by line */ + while (fgets(line, INI_MAX_LINE, file) != NULL) { + lineno++; + + start = line; +#if INI_ALLOW_BOM + if (lineno == 1 && (unsigned char)start[0] == 0xEF && + (unsigned char)start[1] == 0xBB && + (unsigned char)start[2] == 0xBF) { + start += 3; + } +#endif + start = lskip(rstrip(start)); + + if (*start == ';' || *start == '#') { + /* + * Per Python ConfigParser, allow '#' comments at + * start of line. + */ + } +#if INI_ALLOW_MULTILINE + else if (*prev_name && *start && start > line) { + /* Non-black line with leading whitespace, treat as + * continuation of previous name's value + * (as per Python ConfigParser). + */ + if (handler(user, section, prev_name, start) < 0 && + !error) { + error = lineno; + } + } +#endif + else if (*start == '[') { + /* A "[section]" line */ + end = find_char_or_comment(start + 1, ']'); + if (*end == ']') { + *end = '\0'; + strncpy0(section, start + 1, sizeof(section)); + *prev_name = '\0'; + } + else if (!error) { + /* No ']' found on section line */ + error = lineno; + } + } + else if (*start && *start != ';') { + /* Not a comment, must be a name[=:]value pair */ + end = find_char_or_comment(start, '='); + if (*end != '=') { + end = find_char_or_comment(start, ':'); + } + if (*end == '=' || *end == ':') { + *end = '\0'; + name = rstrip(start); + value = lskip(end + 1); + end = find_char_or_comment(value, '\0'); + if (*end == ';') { + *end = '\0'; + } + + rstrip(value); + + /* + * Valid name[=:]value pair found, call + * handler + */ + strncpy0(prev_name, name, sizeof(prev_name)); + if (handler(user, section, name, value) < 0 && + !error) { + error = lineno; + } + } + else if (!error) { + /* No '=' or ':' found on name[=:]value line */ + error = lineno; + } + } + } + +#if !INI_USE_STACK + free(line); +#endif + + return error; +} + +/* See documentation in header file. */ +int ini_parse(const char* filename, ini_entry_handler handler, void* user) +{ + FILE* file; + int error; + + file = fopen(filename, "r"); + if (!file) { + return -1; + } + + error = ini_parse_file(file, handler, user); + fclose(file); + return error; +} diff --git a/src/common/config/session-config.c b/src/common/config/session-config.c deleted file mode 100644 index 08d66851b..000000000 --- a/src/common/config/session-config.c +++ /dev/null @@ -1,4153 +0,0 @@ -/* - * Copyright (C) 2013 Jérémie Galarneau - * - * SPDX-License-Identifier: GPL-2.0-only - * - */ - -#include "lttng/tracker.h" -#define _LGPL_SOURCE -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#include "session-config.h" -#include "config-internal.h" - -#define CONFIG_USERSPACE_PROBE_LOOKUP_METHOD_NAME_MAX_LEN 7 - -struct handler_filter_args { - const char* section; - config_entry_handler_cb handler; - void *user_data; -}; - -struct session_config_validation_ctx { - xmlSchemaParserCtxtPtr parser_ctx; - xmlSchemaPtr schema; - xmlSchemaValidCtxtPtr schema_validation_ctx; -}; - -const char * const config_element_all = "all"; -LTTNG_EXPORT const char * const config_str_yes = "yes"; -LTTNG_EXPORT const char * const config_str_true = "true"; -LTTNG_EXPORT const char * const config_str_on = "on"; -LTTNG_EXPORT const char * const config_str_no = "no"; -LTTNG_EXPORT const char * const config_str_false = "false"; -LTTNG_EXPORT const char * const config_str_off = "off"; -LTTNG_EXPORT const char * const config_xml_encoding = "UTF-8"; -LTTNG_EXPORT const size_t config_xml_encoding_bytes_per_char = 2; /* Size of the encoding's largest character */ -LTTNG_EXPORT const char * const config_xml_indent_string = "\t"; -LTTNG_EXPORT const char * const config_xml_true = "true"; -LTTNG_EXPORT const char * const config_xml_false = "false"; - -const char * const config_element_channel = "channel"; -const char * const config_element_channels = "channels"; -const char * const config_element_domain = "domain"; -const char * const config_element_domains = "domains"; -const char * const config_element_event = "event"; -const char * const config_element_events = "events"; -const char * const config_element_context = "context"; -const char * const config_element_contexts = "contexts"; -const char * const config_element_attributes = "attributes"; -const char * const config_element_exclusion = "exclusion"; -const char * const config_element_exclusions = "exclusions"; -const char * const config_element_function_attributes = "function_attributes"; -const char * const config_element_probe_attributes = "probe_attributes"; -const char * const config_element_symbol_name = "symbol_name"; -const char * const config_element_address = "address"; -const char * const config_element_offset = "offset"; - -const char * const config_element_userspace_probe_lookup = "lookup_method"; -const char * const config_element_userspace_probe_lookup_function_default = "DEFAULT"; -const char * const config_element_userspace_probe_lookup_function_elf = "ELF"; -const char * const config_element_userspace_probe_lookup_tracepoint_sdt = "SDT"; -const char * const config_element_userspace_probe_location_binary_path = "binary_path"; -const char * const config_element_userspace_probe_function_attributes = "userspace_probe_function_attributes"; -const char * const config_element_userspace_probe_function_location_function_name = "function_name"; -const char * const config_element_userspace_probe_tracepoint_attributes = "userspace_probe_tracepoint_attributes"; -const char * const config_element_userspace_probe_tracepoint_location_provider_name = "provider_name"; -const char * const config_element_userspace_probe_tracepoint_location_probe_name = "probe_name"; - -const char * const config_element_name = "name"; -const char * const config_element_enabled = "enabled"; -const char * const config_element_overwrite_mode = "overwrite_mode"; -const char * const config_element_subbuf_size = "subbuffer_size"; -const char * const config_element_num_subbuf = "subbuffer_count"; -const char * const config_element_switch_timer_interval = "switch_timer_interval"; -const char * const config_element_read_timer_interval = "read_timer_interval"; -const char * const config_element_monitor_timer_interval = "monitor_timer_interval"; -const char * const config_element_blocking_timeout = "blocking_timeout"; -const char * const config_element_output = "output"; -const char * const config_element_output_type = "output_type"; -const char * const config_element_tracefile_size = "tracefile_size"; -const char * const config_element_tracefile_count = "tracefile_count"; -const char * const config_element_live_timer_interval = "live_timer_interval"; -const char * const config_element_discarded_events = "discarded_events"; -const char * const config_element_lost_packets = "lost_packets"; -const char * const config_element_type = "type"; -const char * const config_element_buffer_type = "buffer_type"; -const char * const config_element_session = "session"; -const char * const config_element_sessions = "sessions"; -const char * const config_element_context_perf = "perf"; -const char * const config_element_context_app = "app"; -const char * const config_element_context_app_provider_name = "provider_name"; -const char * const config_element_context_app_ctx_name = "ctx_name"; -const char * const config_element_config = "config"; -const char * const config_element_started = "started"; -const char * const config_element_snapshot_mode = "snapshot_mode"; -const char * const config_element_loglevel = "loglevel"; -const char * const config_element_loglevel_type = "loglevel_type"; -const char * const config_element_filter = "filter"; -const char * const config_element_filter_expression = "filter_expression"; -const char * const config_element_snapshot_outputs = "snapshot_outputs"; -const char * const config_element_consumer_output = "consumer_output"; -const char * const config_element_destination = "destination"; -const char * const config_element_path = "path"; -const char * const config_element_net_output = "net_output"; -const char * const config_element_control_uri = "control_uri"; -const char * const config_element_data_uri = "data_uri"; -const char * const config_element_max_size = "max_size"; -const char * const config_element_pid = "pid"; -const char * const config_element_pids = "pids"; -const char * const config_element_shared_memory_path = "shared_memory_path"; - -const char * const config_element_process_attr_id = "id"; -const char * const config_element_process_attr_tracker_pid = "pid_process_attr_tracker"; -const char * const config_element_process_attr_tracker_vpid = "vpid_process_attr_tracker"; -const char * const config_element_process_attr_tracker_uid = "uid_process_attr_tracker"; -const char * const config_element_process_attr_tracker_vuid = "vuid_process_attr_tracker"; -const char * const config_element_process_attr_tracker_gid = "gid_process_attr_tracker"; -const char * const config_element_process_attr_tracker_vgid = "vgid_process_attr_tracker"; -const char * const config_element_process_attr_trackers = "process_attr_trackers"; -const char * const config_element_process_attr_values = "process_attr_values"; -const char * const config_element_process_attr_value_type = "process_attr_value_type"; -const char * const config_element_process_attr_pid_value = "pid"; -const char * const config_element_process_attr_vpid_value = "vpid"; -const char * const config_element_process_attr_uid_value = "uid"; -const char * const config_element_process_attr_vuid_value = "vuid"; -const char * const config_element_process_attr_gid_value = "gid"; -const char * const config_element_process_attr_vgid_value = "vgid"; -const char * const config_element_process_attr_tracker_type = "process_attr_tracker_type"; - -/* Used for support of legacy tracker serialization (< 2.12). */ -const char * const config_element_trackers_legacy = "trackers"; -const char * const config_element_pid_tracker_legacy = "pid_tracker"; -const char * const config_element_tracker_targets_legacy = "targets"; -const char * const config_element_tracker_pid_target_legacy = "pid_target"; -const char * const config_element_tracker_pid_legacy = "pid"; - -const char * const config_element_rotation_schedules = "rotation_schedules"; -const char * const config_element_rotation_schedule_periodic = "periodic"; -const char * const config_element_rotation_schedule_periodic_time_us = "time_us"; -const char * const config_element_rotation_schedule_size_threshold = "size_threshold"; -const char * const config_element_rotation_schedule_size_threshold_bytes = "bytes"; - -const char * const config_domain_type_kernel = "KERNEL"; -const char * const config_domain_type_ust = "UST"; -const char * const config_domain_type_jul = "JUL"; -const char * const config_domain_type_log4j = "LOG4J"; -const char * const config_domain_type_python = "PYTHON"; - -const char * const config_buffer_type_per_pid = "PER_PID"; -const char * const config_buffer_type_per_uid = "PER_UID"; -const char * const config_buffer_type_global = "GLOBAL"; - -const char * const config_overwrite_mode_discard = "DISCARD"; -const char * const config_overwrite_mode_overwrite = "OVERWRITE"; - -const char * const config_output_type_splice = "SPLICE"; -const char * const config_output_type_mmap = "MMAP"; - -const char * const config_loglevel_type_all = "ALL"; -const char * const config_loglevel_type_range = "RANGE"; -const char * const config_loglevel_type_single = "SINGLE"; - -const char * const config_event_type_all = "ALL"; -const char * const config_event_type_tracepoint = "TRACEPOINT"; -const char * const config_event_type_probe = "PROBE"; -const char * const config_event_type_userspace_probe = "USERSPACE_PROBE"; -const char * const config_event_type_function = "FUNCTION"; -const char * const config_event_type_function_entry = "FUNCTION_ENTRY"; -const char * const config_event_type_noop = "NOOP"; -const char * const config_event_type_syscall = "SYSCALL"; -const char * const config_event_type_kprobe = "KPROBE"; -const char * const config_event_type_kretprobe = "KRETPROBE"; - -const char * const config_event_context_pid = "PID"; -const char * const config_event_context_procname = "PROCNAME"; -const char * const config_event_context_prio = "PRIO"; -const char * const config_event_context_nice = "NICE"; -const char * const config_event_context_vpid = "VPID"; -const char * const config_event_context_tid = "TID"; -const char * const config_event_context_vtid = "VTID"; -const char * const config_event_context_ppid = "PPID"; -const char * const config_event_context_vppid = "VPPID"; -const char * const config_event_context_pthread_id = "PTHREAD_ID"; -const char * const config_event_context_hostname = "HOSTNAME"; -const char * const config_event_context_ip = "IP"; -const char * const config_event_context_perf_thread_counter = "PERF_THREAD_COUNTER"; -const char * const config_event_context_app = "APP"; -const char * const config_event_context_interruptible = "INTERRUPTIBLE"; -const char * const config_event_context_preemptible = "PREEMPTIBLE"; -const char * const config_event_context_need_reschedule = "NEED_RESCHEDULE"; -const char * const config_event_context_migratable = "MIGRATABLE"; -const char * const config_event_context_callstack_user= "CALLSTACK_USER"; -const char * const config_event_context_callstack_kernel = "CALLSTACK_KERNEL"; -const char * const config_event_context_cgroup_ns = "CGROUP_NS"; -const char * const config_event_context_ipc_ns = "IPC_NS"; -const char * const config_event_context_mnt_ns = "MNT_NS"; -const char * const config_event_context_net_ns = "NET_NS"; -const char * const config_event_context_pid_ns = "PID_NS"; -const char * const config_event_context_time_ns = "TIME_NS"; -const char * const config_event_context_user_ns = "USER_NS"; -const char * const config_event_context_uts_ns = "UTS_NS"; -const char * const config_event_context_uid = "UID"; -const char * const config_event_context_euid = "EUID"; -const char * const config_event_context_suid = "SUID"; -const char * const config_event_context_gid = "GID"; -const char * const config_event_context_egid = "EGID"; -const char * const config_event_context_sgid = "SGID"; -const char * const config_event_context_vuid = "VUID"; -const char * const config_event_context_veuid = "VEUID"; -const char * const config_event_context_vsuid = "VSUID"; -const char * const config_event_context_vgid = "VGID"; -const char * const config_event_context_vegid = "VEGID"; -const char * const config_event_context_vsgid = "VSGID"; - -/* Deprecated symbols */ -LTTNG_EXPORT const char * const config_element_perf; - -enum process_event_node_phase { - CREATION = 0, - ENABLE = 1, -}; - -struct consumer_output { - int enabled; - char *path; - char *control_uri; - char *data_uri; -}; - -static int config_entry_handler_filter(struct handler_filter_args *args, - const char *section, const char *name, const char *value) -{ - int ret = 0; - struct config_entry entry = { section, name, value }; - - LTTNG_ASSERT(args); - - if (!section || !name || !value) { - ret = -EIO; - goto end; - } - - if (args->section) { - if (strcmp(args->section, section)) { - goto end; - } - } - - ret = args->handler(&entry, args->user_data); -end: - return ret; -} - -int config_get_section_entries(const char *override_path, const char *section, - config_entry_handler_cb handler, void *user_data) -{ - int ret = 0; - const char *path; - FILE *config_file = NULL; - struct handler_filter_args filter = { section, handler, user_data }; - - /* First, try system-wide conf. file. */ - path = DEFAULT_DAEMON_SYSTEM_CONFIGPATH; - - config_file = fopen(path, "r"); - if (config_file) { - DBG("Loading daemon conf file at %s", path); - /* - * Return value is not very important here since error or not, we - * continue and try the next possible conf. file. - */ - (void) ini_parse_file(config_file, - (ini_entry_handler) config_entry_handler_filter, - (void *) &filter); - fclose(config_file); - } - - /* Second is the user local configuration. */ - path = utils_get_home_dir(); - if (path) { - char fullpath[PATH_MAX]; - - ret = snprintf(fullpath, sizeof(fullpath), - DEFAULT_DAEMON_HOME_CONFIGPATH, path); - if (ret < 0) { - PERROR("snprintf user conf. path"); - goto error; - } - - config_file = fopen(fullpath, "r"); - if (config_file) { - DBG("Loading daemon user conf file at %s", path); - /* - * Return value is not very important here since error or not, we - * continue and try the next possible conf. file. - */ - (void) ini_parse_file(config_file, - (ini_entry_handler) config_entry_handler_filter, - (void *) &filter); - fclose(config_file); - } - } - - /* Final path is the one that the user might have provided. */ - if (override_path) { - config_file = fopen(override_path, "r"); - if (config_file) { - DBG("Loading daemon command line conf file at %s", override_path); - (void) ini_parse_file(config_file, - (ini_entry_handler) config_entry_handler_filter, - (void *) &filter); - fclose(config_file); - } else { - ERR("Failed to open daemon configuration file at %s", - override_path); - ret = -ENOENT; - goto error; - } - } - - /* Everything went well. */ - ret = 0; - -error: - return ret; -} - -int config_parse_value(const char *value) -{ - int i, ret = 0; - char *endptr, *lower_str; - size_t len; - unsigned long v; - - len = strlen(value); - if (!len) { - ret = -1; - goto end; - } - - v = strtoul(value, &endptr, 10); - if (endptr != value) { - ret = v; - goto end; - } - - lower_str = zmalloc(len + 1); - if (!lower_str) { - PERROR("zmalloc"); - ret = -errno; - goto end; - } - - for (i = 0; i < len; i++) { - lower_str[i] = tolower(value[i]); - } - - if (!strcmp(lower_str, config_str_yes) || - !strcmp(lower_str, config_str_true) || - !strcmp(lower_str, config_str_on)) { - ret = 1; - } else if (!strcmp(lower_str, config_str_no) || - !strcmp(lower_str, config_str_false) || - !strcmp(lower_str, config_str_off)) { - ret = 0; - } else { - ret = -1; - } - - free(lower_str); -end: - return ret; -} - -/* - * Returns a xmlChar string which must be released using xmlFree(). - */ -static xmlChar *encode_string(const char *in_str) -{ - xmlChar *out_str = NULL; - xmlCharEncodingHandlerPtr handler; - int out_len, ret, in_len; - - LTTNG_ASSERT(in_str); - - handler = xmlFindCharEncodingHandler(config_xml_encoding); - if (!handler) { - ERR("xmlFindCharEncodingHandler return NULL!. Configure issue!"); - goto end; - } - - in_len = strlen(in_str); - /* - * Add 1 byte for the NULL terminted character. The factor 4 here is - * used because UTF-8 characters can take up to 4 bytes. - */ - out_len = (in_len * 4) + 1; - out_str = xmlMalloc(out_len); - if (!out_str) { - goto end; - } - - ret = handler->input(out_str, &out_len, (const xmlChar *) in_str, &in_len); - if (ret < 0) { - xmlFree(out_str); - out_str = NULL; - goto end; - } - - /* out_len is now the size of out_str */ - out_str[out_len] = '\0'; -end: - return out_str; -} - -struct config_writer *config_writer_create(int fd_output, int indent) -{ - int ret; - struct config_writer *writer; - xmlOutputBufferPtr buffer; - - writer = zmalloc(sizeof(struct config_writer)); - if (!writer) { - PERROR("zmalloc config_writer_create"); - goto end; - } - - buffer = xmlOutputBufferCreateFd(fd_output, NULL); - if (!buffer) { - goto error_destroy; - } - - writer->writer = xmlNewTextWriter(buffer); - ret = xmlTextWriterStartDocument(writer->writer, NULL, - config_xml_encoding, NULL); - if (ret < 0) { - goto error_destroy; - } - - ret = xmlTextWriterSetIndentString(writer->writer, - BAD_CAST config_xml_indent_string); - if (ret) { - goto error_destroy; - } - - ret = xmlTextWriterSetIndent(writer->writer, indent); - if (ret) { - goto error_destroy; - } - -end: - return writer; -error_destroy: - config_writer_destroy(writer); - return NULL; -} - -int config_writer_destroy(struct config_writer *writer) -{ - int ret = 0; - - if (!writer) { - ret = -EINVAL; - goto end; - } - - if (xmlTextWriterEndDocument(writer->writer) < 0) { - WARN("Could not close XML document"); - ret = -EIO; - } - - if (writer->writer) { - xmlFreeTextWriter(writer->writer); - } - - free(writer); -end: - return ret; -} - -int config_writer_open_element(struct config_writer *writer, - const char *element_name) -{ - int ret; - xmlChar *encoded_element_name; - - if (!writer || !writer->writer || !element_name || !element_name[0]) { - ret = -1; - goto end; - } - - encoded_element_name = encode_string(element_name); - if (!encoded_element_name) { - ret = -1; - goto end; - } - - ret = xmlTextWriterStartElement(writer->writer, encoded_element_name); - xmlFree(encoded_element_name); -end: - return ret >= 0 ? 0 : ret; -} - -int config_writer_write_attribute(struct config_writer *writer, - const char *name, const char *value) -{ - int ret; - xmlChar *encoded_name = NULL; - xmlChar *encoded_value = NULL; - - if (!writer || !writer->writer || !name || !name[0]) { - ret = -1; - goto end; - } - - encoded_name = encode_string(name); - if (!encoded_name) { - ret = -1; - goto end; - } - - encoded_value = encode_string(value); - if (!encoded_value) { - ret = -1; - goto end; - } - - ret = xmlTextWriterWriteAttribute(writer->writer, encoded_name, - encoded_value); -end: - xmlFree(encoded_name); - xmlFree(encoded_value); - return ret >= 0 ? 0 : ret; -} - -int config_writer_close_element(struct config_writer *writer) -{ - int ret; - - if (!writer || !writer->writer) { - ret = -1; - goto end; - } - - ret = xmlTextWriterEndElement(writer->writer); -end: - return ret >= 0 ? 0 : ret; -} - -int config_writer_write_element_unsigned_int(struct config_writer *writer, - const char *element_name, uint64_t value) -{ - int ret; - xmlChar *encoded_element_name; - - if (!writer || !writer->writer || !element_name || !element_name[0]) { - ret = -1; - goto end; - } - - encoded_element_name = encode_string(element_name); - if (!encoded_element_name) { - ret = -1; - goto end; - } - - ret = xmlTextWriterWriteFormatElement(writer->writer, - encoded_element_name, "%" PRIu64, value); - xmlFree(encoded_element_name); -end: - return ret >= 0 ? 0 : ret; -} - -int config_writer_write_element_signed_int(struct config_writer *writer, - const char *element_name, int64_t value) -{ - int ret; - xmlChar *encoded_element_name; - - if (!writer || !writer->writer || !element_name || !element_name[0]) { - ret = -1; - goto end; - } - - encoded_element_name = encode_string(element_name); - if (!encoded_element_name) { - ret = -1; - goto end; - } - - ret = xmlTextWriterWriteFormatElement(writer->writer, - encoded_element_name, "%" PRIi64, value); - xmlFree(encoded_element_name); -end: - return ret >= 0 ? 0 : ret; -} - -int config_writer_write_element_bool(struct config_writer *writer, - const char *element_name, int value) -{ - return config_writer_write_element_string(writer, element_name, - value ? config_xml_true : config_xml_false); -} - -int config_writer_write_element_double(struct config_writer *writer, - const char *element_name, - double value) -{ - int ret; - xmlChar *encoded_element_name; - - if (!writer || !writer->writer || !element_name || !element_name[0]) { - ret = -1; - goto end; - } - - encoded_element_name = encode_string(element_name); - if (!encoded_element_name) { - ret = -1; - goto end; - } - - ret = xmlTextWriterWriteFormatElement( - writer->writer, encoded_element_name, "%f", value); - xmlFree(encoded_element_name); -end: - return ret >= 0 ? 0 : ret; -} - -int config_writer_write_element_string(struct config_writer *writer, - const char *element_name, const char *value) -{ - int ret; - xmlChar *encoded_element_name = NULL; - xmlChar *encoded_value = NULL; - - if (!writer || !writer->writer || !element_name || !element_name[0] || - !value) { - ret = -1; - goto end; - } - - encoded_element_name = encode_string(element_name); - if (!encoded_element_name) { - ret = -1; - goto end; - } - - encoded_value = encode_string(value); - if (!encoded_value) { - ret = -1; - goto end; - } - - ret = xmlTextWriterWriteElement(writer->writer, encoded_element_name, - encoded_value); -end: - xmlFree(encoded_element_name); - xmlFree(encoded_value); - return ret >= 0 ? 0 : ret; -} - -static -void xml_error_handler(void *ctx, const char *format, ...) -{ - char *errMsg; - va_list args; - int ret; - - va_start(args, format); - ret = vasprintf(&errMsg, format, args); - va_end(args); - if (ret == -1) { - ERR("String allocation failed in xml error handler"); - return; - } - - fprintf(stderr, "XML Error: %s", errMsg); - free(errMsg); -} - -static -void fini_session_config_validation_ctx( - struct session_config_validation_ctx *ctx) -{ - if (ctx->parser_ctx) { - xmlSchemaFreeParserCtxt(ctx->parser_ctx); - } - - if (ctx->schema) { - xmlSchemaFree(ctx->schema); - } - - if (ctx->schema_validation_ctx) { - xmlSchemaFreeValidCtxt(ctx->schema_validation_ctx); - } - - memset(ctx, 0, sizeof(struct session_config_validation_ctx)); -} - -static -char *get_session_config_xsd_path(void) -{ - char *xsd_path; - const char *base_path = lttng_secure_getenv(DEFAULT_SESSION_CONFIG_XSD_PATH_ENV); - size_t base_path_len; - size_t max_path_len; - - if (!base_path) { - base_path = DEFAULT_SESSION_CONFIG_XSD_PATH; - } - - base_path_len = strlen(base_path); - max_path_len = base_path_len + - sizeof(DEFAULT_SESSION_CONFIG_XSD_FILENAME) + 1; - xsd_path = zmalloc(max_path_len); - if (!xsd_path) { - goto end; - } - - strcpy(xsd_path, base_path); - if (xsd_path[base_path_len - 1] != '/') { - xsd_path[base_path_len++] = '/'; - } - - strcpy(xsd_path + base_path_len, DEFAULT_SESSION_CONFIG_XSD_FILENAME); -end: - return xsd_path; -} - -static -int init_session_config_validation_ctx( - struct session_config_validation_ctx *ctx) -{ - int ret; - char *xsd_path = get_session_config_xsd_path(); - - if (!xsd_path) { - ret = -LTTNG_ERR_NOMEM; - goto end; - } - - ctx->parser_ctx = xmlSchemaNewParserCtxt(xsd_path); - if (!ctx->parser_ctx) { - ERR("XSD parser context creation failed"); - ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; - goto end; - } - xmlSchemaSetParserErrors(ctx->parser_ctx, xml_error_handler, - xml_error_handler, NULL); - - ctx->schema = xmlSchemaParse(ctx->parser_ctx); - if (!ctx->schema) { - ERR("XSD parsing failed"); - ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; - goto end; - } - - ctx->schema_validation_ctx = xmlSchemaNewValidCtxt(ctx->schema); - if (!ctx->schema_validation_ctx) { - ERR("XSD validation context creation failed"); - ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; - goto end; - } - - xmlSchemaSetValidErrors(ctx->schema_validation_ctx, xml_error_handler, - xml_error_handler, NULL); - ret = 0; - -end: - if (ret) { - fini_session_config_validation_ctx(ctx); - } - - free(xsd_path); - return ret; -} - -static -int parse_uint(xmlChar *str, uint64_t *val) -{ - int ret; - char *endptr; - - if (!str || !val) { - ret = -1; - goto end; - } - - *val = strtoull((const char *) str, &endptr, 10); - if (!endptr || *endptr) { - ret = -1; - } else { - ret = 0; - } - -end: - return ret; -} - -static -int parse_int(xmlChar *str, int64_t *val) -{ - int ret; - char *endptr; - - if (!str || !val) { - ret = -1; - goto end; - } - - *val = strtoll((const char *) str, &endptr, 10); - if (!endptr || *endptr) { - ret = -1; - } else { - ret = 0; - } - -end: - return ret; -} - -static -int parse_bool(xmlChar *str, int *val) -{ - int ret = 0; - - if (!str || !val) { - ret = -1; - goto end; - } - - if (!strcmp((const char *) str, config_xml_true) || - !strcmp((const char *) str, "1")) { - *val = 1; - } else if (!strcmp((const char *) str, config_xml_false) || - !strcmp((const char *) str, "0")) { - *val = 0; - } else { - WARN("Invalid boolean value encountered (%s).", - (const char *) str); - ret = -1; - } -end: - return ret; -} - -static -int get_domain_type(xmlChar *domain) -{ - int ret; - - if (!domain) { - goto error; - } - - if (!strcmp((char *) domain, config_domain_type_kernel)) { - ret = LTTNG_DOMAIN_KERNEL; - } else if (!strcmp((char *) domain, config_domain_type_ust)) { - ret = LTTNG_DOMAIN_UST; - } else if (!strcmp((char *) domain, config_domain_type_jul)) { - ret = LTTNG_DOMAIN_JUL; - } else if (!strcmp((char *) domain, config_domain_type_log4j)) { - ret = LTTNG_DOMAIN_LOG4J; - } else if (!strcmp((char *) domain, config_domain_type_python)) { - ret = LTTNG_DOMAIN_PYTHON; - } else { - goto error; - } - - return ret; -error: - return -1; -} - -static -int get_buffer_type(xmlChar *buffer_type) -{ - int ret; - - if (!buffer_type) { - goto error; - } - - if (!strcmp((char *) buffer_type, config_buffer_type_global)) { - ret = LTTNG_BUFFER_GLOBAL; - } else if (!strcmp((char *) buffer_type, config_buffer_type_per_uid)) { - ret = LTTNG_BUFFER_PER_UID; - } else if (!strcmp((char *) buffer_type, config_buffer_type_per_pid)) { - ret = LTTNG_BUFFER_PER_PID; - } else { - goto error; - } - - return ret; -error: - return -1; -} - -static -int get_overwrite_mode(xmlChar *overwrite_mode) -{ - int ret; - - if (!overwrite_mode) { - goto error; - } - - if (!strcmp((char *) overwrite_mode, config_overwrite_mode_overwrite)) { - ret = 1; - } else if (!strcmp((char *) overwrite_mode, - config_overwrite_mode_discard)) { - ret = 0; - } else { - goto error; - } - - return ret; -error: - return -1; -} - -static -int get_output_type(xmlChar *output_type) -{ - int ret; - - if (!output_type) { - goto error; - } - - if (!strcmp((char *) output_type, config_output_type_mmap)) { - ret = LTTNG_EVENT_MMAP; - } else if (!strcmp((char *) output_type, config_output_type_splice)) { - ret = LTTNG_EVENT_SPLICE; - } else { - goto error; - } - - return ret; -error: - return -1; -} - -static -int get_event_type(xmlChar *event_type) -{ - int ret; - - if (!event_type) { - goto error; - } - - if (!strcmp((char *) event_type, config_event_type_all)) { - ret = LTTNG_EVENT_ALL; - } else if (!strcmp((char *) event_type, config_event_type_tracepoint)) { - ret = LTTNG_EVENT_TRACEPOINT; - } else if (!strcmp((char *) event_type, config_event_type_probe)) { - ret = LTTNG_EVENT_PROBE; - } else if (!strcmp((char *) event_type, - config_event_type_userspace_probe)) { - ret = LTTNG_EVENT_USERSPACE_PROBE; - } else if (!strcmp((char *) event_type, config_event_type_function)) { - ret = LTTNG_EVENT_FUNCTION; - } else if (!strcmp((char *) event_type, - config_event_type_function_entry)) { - ret = LTTNG_EVENT_FUNCTION_ENTRY; - } else if (!strcmp((char *) event_type, config_event_type_noop)) { - ret = LTTNG_EVENT_NOOP; - } else if (!strcmp((char *) event_type, config_event_type_syscall)) { - ret = LTTNG_EVENT_SYSCALL; - } else { - goto error; - } - - return ret; -error: - return -1; -} - -static -int get_loglevel_type(xmlChar *loglevel_type) -{ - int ret; - - if (!loglevel_type) { - goto error; - } - - if (!strcmp((char *) loglevel_type, config_loglevel_type_all)) { - ret = LTTNG_EVENT_LOGLEVEL_ALL; - } else if (!strcmp((char *) loglevel_type, - config_loglevel_type_range)) { - ret = LTTNG_EVENT_LOGLEVEL_RANGE; - } else if (!strcmp((char *) loglevel_type, - config_loglevel_type_single)) { - ret = LTTNG_EVENT_LOGLEVEL_SINGLE; - } else { - goto error; - } - - return ret; -error: - return -1; -} - -/* - * Return the context type or -1 on error. - */ -static -int get_context_type(xmlChar *context_type) -{ - int ret; - - if (!context_type) { - goto error; - } - - if (!strcmp((char *) context_type, config_event_context_pid)) { - ret = LTTNG_EVENT_CONTEXT_PID; - } else if (!strcmp((char *) context_type, - config_event_context_procname)) { - ret = LTTNG_EVENT_CONTEXT_PROCNAME; - } else if (!strcmp((char *) context_type, - config_event_context_prio)) { - ret = LTTNG_EVENT_CONTEXT_PRIO; - } else if (!strcmp((char *) context_type, - config_event_context_nice)) { - ret = LTTNG_EVENT_CONTEXT_NICE; - } else if (!strcmp((char *) context_type, - config_event_context_vpid)) { - ret = LTTNG_EVENT_CONTEXT_VPID; - } else if (!strcmp((char *) context_type, - config_event_context_tid)) { - ret = LTTNG_EVENT_CONTEXT_TID; - } else if (!strcmp((char *) context_type, - config_event_context_vtid)) { - ret = LTTNG_EVENT_CONTEXT_VTID; - } else if (!strcmp((char *) context_type, - config_event_context_ppid)) { - ret = LTTNG_EVENT_CONTEXT_PPID; - } else if (!strcmp((char *) context_type, - config_event_context_vppid)) { - ret = LTTNG_EVENT_CONTEXT_VPPID; - } else if (!strcmp((char *) context_type, - config_event_context_pthread_id)) { - ret = LTTNG_EVENT_CONTEXT_PTHREAD_ID; - } else if (!strcmp((char *) context_type, - config_event_context_hostname)) { - ret = LTTNG_EVENT_CONTEXT_HOSTNAME; - } else if (!strcmp((char *) context_type, - config_event_context_ip)) { - ret = LTTNG_EVENT_CONTEXT_IP; - } else if (!strcmp((char *) context_type, - config_event_context_interruptible)) { - ret = LTTNG_EVENT_CONTEXT_INTERRUPTIBLE; - } else if (!strcmp((char *) context_type, - config_event_context_preemptible)) { - ret = LTTNG_EVENT_CONTEXT_PREEMPTIBLE; - } else if (!strcmp((char *) context_type, - config_event_context_need_reschedule)) { - ret = LTTNG_EVENT_CONTEXT_NEED_RESCHEDULE; - } else if (!strcmp((char *) context_type, - config_event_context_migratable)) { - ret = LTTNG_EVENT_CONTEXT_MIGRATABLE; - } else if (!strcmp((char *) context_type, - config_event_context_callstack_user)) { - ret = LTTNG_EVENT_CONTEXT_CALLSTACK_USER; - } else if (!strcmp((char *) context_type, - config_event_context_callstack_kernel)) { - ret = LTTNG_EVENT_CONTEXT_CALLSTACK_KERNEL; - } else if (!strcmp((char *) context_type, - config_event_context_cgroup_ns)) { - ret = LTTNG_EVENT_CONTEXT_CGROUP_NS; - } else if (!strcmp((char *) context_type, - config_event_context_ipc_ns)) { - ret = LTTNG_EVENT_CONTEXT_IPC_NS; - } else if (!strcmp((char *) context_type, - config_event_context_mnt_ns)) { - ret = LTTNG_EVENT_CONTEXT_MNT_NS; - } else if (!strcmp((char *) context_type, - config_event_context_net_ns)) { - ret = LTTNG_EVENT_CONTEXT_NET_NS; - } else if (!strcmp((char *) context_type, - config_event_context_pid_ns)) { - ret = LTTNG_EVENT_CONTEXT_PID_NS; - } else if (!strcmp((char *) context_type, - config_event_context_time_ns)) { - ret = LTTNG_EVENT_CONTEXT_TIME_NS; - } else if (!strcmp((char *) context_type, - config_event_context_user_ns)) { - ret = LTTNG_EVENT_CONTEXT_USER_NS; - } else if (!strcmp((char *) context_type, - config_event_context_uts_ns)) { - ret = LTTNG_EVENT_CONTEXT_UTS_NS; - } else if (!strcmp((char *) context_type, - config_event_context_uid)) { - ret = LTTNG_EVENT_CONTEXT_UID; - } else if (!strcmp((char *) context_type, - config_event_context_euid)) { - ret = LTTNG_EVENT_CONTEXT_EUID; - } else if (!strcmp((char *) context_type, - config_event_context_suid)) { - ret = LTTNG_EVENT_CONTEXT_SUID; - } else if (!strcmp((char *) context_type, - config_event_context_gid)) { - ret = LTTNG_EVENT_CONTEXT_GID; - } else if (!strcmp((char *) context_type, - config_event_context_egid)) { - ret = LTTNG_EVENT_CONTEXT_EGID; - } else if (!strcmp((char *) context_type, - config_event_context_sgid)) { - ret = LTTNG_EVENT_CONTEXT_SGID; - } else if (!strcmp((char *) context_type, - config_event_context_vuid)) { - ret = LTTNG_EVENT_CONTEXT_VUID; - } else if (!strcmp((char *) context_type, - config_event_context_veuid)) { - ret = LTTNG_EVENT_CONTEXT_VEUID; - } else if (!strcmp((char *) context_type, - config_event_context_vsuid)) { - ret = LTTNG_EVENT_CONTEXT_VSUID; - } else if (!strcmp((char *) context_type, - config_event_context_vgid)) { - ret = LTTNG_EVENT_CONTEXT_VGID; - } else if (!strcmp((char *) context_type, - config_event_context_vegid)) { - ret = LTTNG_EVENT_CONTEXT_VEGID; - } else if (!strcmp((char *) context_type, - config_event_context_vsgid)) { - ret = LTTNG_EVENT_CONTEXT_VSGID; - } else { - goto error; - } - - return ret; -error: - return -1; -} - -static -int init_domain(xmlNodePtr domain_node, struct lttng_domain *domain) -{ - int ret; - xmlNodePtr node; - - for (node = xmlFirstElementChild(domain_node); node; - node = xmlNextElementSibling(node)) { - if (!strcmp((const char *) node->name, config_element_type)) { - /* domain type */ - xmlChar *node_content = xmlNodeGetContent(node); - if (!node_content) { - ret = -LTTNG_ERR_NOMEM; - goto end; - } - - ret = get_domain_type(node_content); - free(node_content); - if (ret < 0) { - ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; - goto end; - } - - domain->type = ret; - } else if (!strcmp((const char *) node->name, - config_element_buffer_type)) { - /* buffer type */ - xmlChar *node_content = xmlNodeGetContent(node); - if (!node_content) { - ret = -LTTNG_ERR_NOMEM; - goto end; - } - - ret = get_buffer_type(node_content); - free(node_content); - if (ret < 0) { - ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; - goto end; - } - - domain->buf_type = ret; - } - } - ret = 0; -end: - return ret; -} - -static -int get_net_output_uris(xmlNodePtr net_output_node, char **control_uri, - char **data_uri) -{ - xmlNodePtr node; - - for (node = xmlFirstElementChild(net_output_node); node; - node = xmlNextElementSibling(node)) { - if (!strcmp((const char *) node->name, config_element_control_uri)) { - /* control_uri */ - *control_uri = (char *) xmlNodeGetContent(node); - if (!*control_uri) { - break; - } - } else { - /* data_uri */ - *data_uri = (char *) xmlNodeGetContent(node); - if (!*data_uri) { - break; - } - } - } - - return *control_uri || *data_uri ? 0 : -LTTNG_ERR_LOAD_INVALID_CONFIG; -} - -static -int process_consumer_output(xmlNodePtr consumer_output_node, - struct consumer_output *output) -{ - int ret; - xmlNodePtr node; - - LTTNG_ASSERT(output); - - for (node = xmlFirstElementChild(consumer_output_node); node; - node = xmlNextElementSibling(node)) { - if (!strcmp((const char *) node->name, config_element_enabled)) { - xmlChar *enabled_str = xmlNodeGetContent(node); - - /* enabled */ - if (!enabled_str) { - ret = -LTTNG_ERR_NOMEM; - goto end; - } - - ret = parse_bool(enabled_str, &output->enabled); - free(enabled_str); - if (ret) { - goto end; - } - } else { - xmlNodePtr output_type_node; - - /* destination */ - output_type_node = xmlFirstElementChild(node); - if (!output_type_node) { - ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; - goto end; - } - - if (!strcmp((const char *) output_type_node->name, - config_element_path)) { - /* path */ - output->path = (char *) xmlNodeGetContent(output_type_node); - if (!output->path) { - ret = -LTTNG_ERR_NOMEM; - goto end; - } - } else { - /* net_output */ - ret = get_net_output_uris(output_type_node, - &output->control_uri, &output->data_uri); - if (ret) { - goto end; - } - } - } - } - ret = 0; - -end: - if (ret) { - free(output->path); - free(output->control_uri); - free(output->data_uri); - memset(output, 0, sizeof(struct consumer_output)); - } - return ret; -} - -static -int create_session_net_output(const char *name, const char *control_uri, - const char *data_uri) -{ - int ret; - struct lttng_handle *handle; - const char *uri = NULL; - - LTTNG_ASSERT(name); - - handle = lttng_create_handle(name, NULL); - if (!handle) { - ret = -LTTNG_ERR_NOMEM; - goto end; - } - - if (!control_uri || !data_uri) { - uri = control_uri ? control_uri : data_uri; - control_uri = uri; - data_uri = uri; - } - - ret = lttng_set_consumer_url(handle, control_uri, data_uri); - lttng_destroy_handle(handle); -end: - return ret; -} - -static -int create_snapshot_session(const char *session_name, xmlNodePtr output_node, - const struct config_load_session_override_attr *overrides) -{ - int ret; - xmlNodePtr node = NULL; - xmlNodePtr snapshot_output_list_node; - xmlNodePtr snapshot_output_node; - - LTTNG_ASSERT(session_name); - - ret = lttng_create_session_snapshot(session_name, NULL); - if (ret) { - goto end; - } - - if (!output_node) { - goto end; - } - - snapshot_output_list_node = xmlFirstElementChild(output_node); - - /* Parse and create snapshot outputs */ - - for (snapshot_output_node = - xmlFirstElementChild(snapshot_output_list_node); - snapshot_output_node; snapshot_output_node = - xmlNextElementSibling(snapshot_output_node)) { - char *name = NULL; - uint64_t max_size = UINT64_MAX; - struct consumer_output output = { 0 }; - struct lttng_snapshot_output *snapshot_output = NULL; - const char *control_uri = NULL; - const char *data_uri = NULL; - const char *path = NULL; - - for (node = xmlFirstElementChild(snapshot_output_node); node; - node = xmlNextElementSibling(node)) { - if (!strcmp((const char *) node->name, - config_element_name)) { - /* name */ - name = (char *) xmlNodeGetContent(node); - if (!name) { - ret = -LTTNG_ERR_NOMEM; - goto error_snapshot_output; - } - } else if (!strcmp((const char *) node->name, - config_element_max_size)) { - xmlChar *content = xmlNodeGetContent(node); - - /* max_size */ - if (!content) { - ret = -LTTNG_ERR_NOMEM; - goto error_snapshot_output; - } - ret = parse_uint(content, &max_size); - free(content); - if (ret) { - ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; - goto error_snapshot_output; - } - } else { - /* consumer_output */ - ret = process_consumer_output(node, &output); - if (ret) { - goto error_snapshot_output; - } - } - } - - control_uri = output.control_uri; - data_uri = output.data_uri; - path = output.path; - - if (overrides) { - if (overrides->path_url) { - path = overrides->path_url; - /* Control/data_uri are null */ - control_uri = NULL; - data_uri = NULL; - } else { - if (overrides->ctrl_url) { - control_uri = overrides->ctrl_url; - /* path is null */ - path = NULL; - } - if (overrides->data_url) { - data_uri = overrides->data_url; - /* path is null */ - path = NULL; - } - } - } - - snapshot_output = lttng_snapshot_output_create(); - if (!snapshot_output) { - ret = -LTTNG_ERR_NOMEM; - goto error_snapshot_output; - } - - ret = lttng_snapshot_output_set_name(name, snapshot_output); - if (ret) { - goto error_snapshot_output; - } - - ret = lttng_snapshot_output_set_size(max_size, snapshot_output); - if (ret) { - goto error_snapshot_output; - } - - if (path) { - ret = lttng_snapshot_output_set_ctrl_url(path, - snapshot_output); - if (ret) { - goto error_snapshot_output; - } - } else { - if (control_uri) { - ret = lttng_snapshot_output_set_ctrl_url(control_uri, - snapshot_output); - if (ret) { - goto error_snapshot_output; - } - } - - if (data_uri) { - ret = lttng_snapshot_output_set_data_url(data_uri, - snapshot_output); - if (ret) { - goto error_snapshot_output; - } - } - } - - ret = lttng_snapshot_add_output(session_name, snapshot_output); -error_snapshot_output: - free(name); - free(output.path); - free(output.control_uri); - free(output.data_uri); - lttng_snapshot_output_destroy(snapshot_output); - if (ret) { - goto end; - } - } -end: - return ret; -} - -static -int create_session(const char *name, - xmlNodePtr output_node, - uint64_t live_timer_interval, - const struct config_load_session_override_attr *overrides) -{ - int ret; - struct consumer_output output = { 0 }; - xmlNodePtr consumer_output_node; - const char *control_uri = NULL; - const char *data_uri = NULL; - const char *path = NULL; - - LTTNG_ASSERT(name); - - if (output_node) { - consumer_output_node = xmlFirstElementChild(output_node); - if (!consumer_output_node) { - ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; - goto end; - } - - if (strcmp((const char *) consumer_output_node->name, - config_element_consumer_output)) { - WARN("Invalid output type, expected %s node", - config_element_consumer_output); - ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; - goto end; - } - - ret = process_consumer_output(consumer_output_node, &output); - if (ret) { - goto end; - } - } - - control_uri = output.control_uri; - data_uri = output.data_uri; - path = output.path; - - /* Check for override and apply them */ - if (overrides) { - if (overrides->path_url) { - path = overrides->path_url; - /* control/data_uri are null */; - control_uri = NULL; - data_uri = NULL; - } else { - if (overrides->ctrl_url) { - control_uri = overrides->ctrl_url; - /* path is null */ - path = NULL; - } - if (overrides->data_url) { - data_uri = overrides->data_url; - /* path is null */ - path = NULL; - } - } - } - - - if (live_timer_interval != UINT64_MAX && !control_uri && !data_uri) { - ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; - goto end; - } - - if (control_uri || data_uri) { - /* network destination */ - if (live_timer_interval && live_timer_interval != UINT64_MAX) { - /* - * URLs are provided for sure since the test above make sure that - * with a live timer the data and control URIs are provided. So, - * NULL is passed here and will be set right after. - */ - ret = lttng_create_session_live(name, NULL, live_timer_interval); - } else { - ret = lttng_create_session(name, NULL); - } - if (ret) { - goto end; - } - - ret = create_session_net_output(name, control_uri, data_uri); - if (ret) { - goto end; - } - - } else { - /* either local output or no output */ - ret = lttng_create_session(name, path); - if (ret) { - goto end; - } - } -end: - free(output.path); - free(output.control_uri); - free(output.data_uri); - return ret; -} - -static -struct lttng_userspace_probe_location * -process_userspace_probe_function_attribute_node( - xmlNodePtr attribute_node) -{ - xmlNodePtr function_attribute_node; - char *function_name = NULL, *binary_path = NULL; - struct lttng_userspace_probe_location *location = NULL; - struct lttng_userspace_probe_location_lookup_method *lookup_method = NULL; - - /* - * Process userspace probe location function attributes. The order of - * the fields are not guaranteed so we need to iterate over all fields - * and check at the end if everything we need for this location type is - * there. - */ - for (function_attribute_node = - xmlFirstElementChild(attribute_node); - function_attribute_node; - function_attribute_node = xmlNextElementSibling( - function_attribute_node)) { - /* Handle function name, binary path and lookup method. */ - if (!strcmp((const char *) function_attribute_node->name, - config_element_userspace_probe_function_location_function_name)) { - function_name = (char *) xmlNodeGetContent(function_attribute_node); - if (!function_name) { - goto error; - } - } else if (!strcmp((const char *) function_attribute_node->name, - config_element_userspace_probe_location_binary_path)) { - binary_path = (char *) xmlNodeGetContent(function_attribute_node); - if (!binary_path) { - goto error; - } - } else if (!strcmp((const char *) function_attribute_node->name, - config_element_userspace_probe_lookup)) { - char *lookup_method_name; - - lookup_method_name = (char *) xmlNodeGetContent( - function_attribute_node); - if (!lookup_method_name) { - goto error; - } - - /* - * function_default lookup method defaults to - * function_elf lookup method at the moment. - */ - if (!strcmp(lookup_method_name, config_element_userspace_probe_lookup_function_elf) - || !strcmp(lookup_method_name, config_element_userspace_probe_lookup_function_default)) { - lookup_method = lttng_userspace_probe_location_lookup_method_function_elf_create(); - if (!lookup_method) { - PERROR("Error creating function default/ELF lookup method"); - } - } else { - WARN("Unknown function lookup method"); - } - - free(lookup_method_name); - if (!lookup_method) { - goto error; - } - } else { - goto error; - } - - /* Check if all the necessary fields were found. */ - if (binary_path && function_name && lookup_method) { - /* Ownership of lookup_method is transferred. */ - location = - lttng_userspace_probe_location_function_create( - binary_path, function_name, - lookup_method); - lookup_method = NULL; - goto error; - } - } -error: - lttng_userspace_probe_location_lookup_method_destroy(lookup_method); - free(binary_path); - free(function_name); - return location; -} - -static -struct lttng_userspace_probe_location * -process_userspace_probe_tracepoint_attribute_node( - xmlNodePtr attribute_node) -{ - xmlNodePtr tracepoint_attribute_node; - char *probe_name = NULL, *provider_name = NULL, *binary_path = NULL; - struct lttng_userspace_probe_location *location = NULL; - struct lttng_userspace_probe_location_lookup_method *lookup_method = NULL; - - /* - * Process userspace probe location tracepoint attributes. The order of - * the fields are not guaranteed so we need to iterate over all fields - * and check at the end if everything we need for this location type is - * there. - */ - for (tracepoint_attribute_node = - xmlFirstElementChild(attribute_node); tracepoint_attribute_node; - tracepoint_attribute_node = xmlNextElementSibling( - tracepoint_attribute_node)) { - if (!strcmp((const char *) tracepoint_attribute_node->name, - config_element_userspace_probe_tracepoint_location_probe_name)) { - probe_name = (char *) xmlNodeGetContent(tracepoint_attribute_node); - if (!probe_name) { - goto error; - } - } else if (!strcmp((const char *) tracepoint_attribute_node->name, - config_element_userspace_probe_tracepoint_location_provider_name)) { - provider_name = (char *) xmlNodeGetContent(tracepoint_attribute_node); - if (!provider_name) { - goto error; - } - } else if (!strcmp((const char *) tracepoint_attribute_node->name, - config_element_userspace_probe_location_binary_path)) { - binary_path = (char *) xmlNodeGetContent(tracepoint_attribute_node); - if (!binary_path) { - goto error; - } - } else if (!strcmp((const char *) tracepoint_attribute_node->name, - config_element_userspace_probe_lookup)) { - char *lookup_method_name; - - lookup_method_name = (char *) xmlNodeGetContent( - tracepoint_attribute_node); - if (!lookup_method_name) { - goto error; - } - - if (!strcmp(lookup_method_name, - config_element_userspace_probe_lookup_tracepoint_sdt)) { - lookup_method = - lttng_userspace_probe_location_lookup_method_tracepoint_sdt_create(); - if (!lookup_method) { - PERROR("Error creating tracepoint SDT lookup method"); - } - } else { - WARN("Unknown tracepoint lookup method"); - } - - free(lookup_method_name); - if (!lookup_method) { - goto error; - } - } else { - WARN("Unknown tracepoint attribute"); - goto error; - } - - /* Check if all the necessary fields were found. */ - if (binary_path && provider_name && probe_name && lookup_method) { - /* Ownership of lookup_method is transferred. */ - location = - lttng_userspace_probe_location_tracepoint_create( - binary_path, provider_name, - probe_name, lookup_method); - lookup_method = NULL; - goto error; - } - } -error: - lttng_userspace_probe_location_lookup_method_destroy(lookup_method); - free(binary_path); - free(provider_name); - free(probe_name); - return location; -} - -static -int process_probe_attribute_node(xmlNodePtr probe_attribute_node, - struct lttng_event_probe_attr *attr) -{ - int ret; - - LTTNG_ASSERT(probe_attribute_node); - LTTNG_ASSERT(attr); - - if (!strcmp((const char *) probe_attribute_node->name, - config_element_address)) { - xmlChar *content; - uint64_t addr = 0; - - /* addr */ - content = xmlNodeGetContent(probe_attribute_node); - if (!content) { - ret = -LTTNG_ERR_NOMEM; - goto end; - } - - ret = parse_uint(content, &addr); - free(content); - if (ret) { - ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; - goto end; - } - - attr->addr = addr; - } else if (!strcmp((const char *) probe_attribute_node->name, - config_element_offset)) { - xmlChar *content; - uint64_t offset = 0; - - /* offset */ - content = xmlNodeGetContent(probe_attribute_node); - if (!content) { - ret = -LTTNG_ERR_NOMEM; - goto end; - } - - ret = parse_uint(content, &offset); - free(content); - if (ret) { - ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; - goto end; - } - - attr->offset = offset; - } else if (!strcmp((const char *) probe_attribute_node->name, - config_element_symbol_name)) { - xmlChar *content; - - /* symbol_name */ - content = xmlNodeGetContent(probe_attribute_node); - if (!content) { - ret = -LTTNG_ERR_NOMEM; - goto end; - } - - ret = lttng_strncpy(attr->symbol_name, - (const char *) content, - LTTNG_SYMBOL_NAME_LEN); - if (ret == -1) { - ERR("symbol name \"%s\"'s length (%zu) exceeds the maximal permitted length (%d) in session configuration", - (const char *) content, - strlen((const char *) content), - LTTNG_SYMBOL_NAME_LEN); - ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; - free(content); - goto end; - } - free(content); - } - ret = 0; -end: - return ret; -} - -static -int process_event_node(xmlNodePtr event_node, struct lttng_handle *handle, - const char *channel_name, const enum process_event_node_phase phase) -{ - int ret = 0, i; - xmlNodePtr node; - struct lttng_event *event; - char **exclusions = NULL; - unsigned long exclusion_count = 0; - char *filter_expression = NULL; - - LTTNG_ASSERT(event_node); - LTTNG_ASSERT(handle); - LTTNG_ASSERT(channel_name); - - event = lttng_event_create(); - if (!event) { - ret = -LTTNG_ERR_NOMEM; - goto end; - } - - /* Initialize default log level which varies by domain */ - switch (handle->domain.type) - { - case LTTNG_DOMAIN_JUL: - event->loglevel = LTTNG_LOGLEVEL_JUL_ALL; - break; - case LTTNG_DOMAIN_LOG4J: - event->loglevel = LTTNG_LOGLEVEL_LOG4J_ALL; - break; - case LTTNG_DOMAIN_PYTHON: - event->loglevel = LTTNG_LOGLEVEL_PYTHON_DEBUG; - break; - case LTTNG_DOMAIN_UST: - case LTTNG_DOMAIN_KERNEL: - event->loglevel = LTTNG_LOGLEVEL_DEBUG; - break; - default: - abort(); - } - - for (node = xmlFirstElementChild(event_node); node; - node = xmlNextElementSibling(node)) { - if (!strcmp((const char *) node->name, config_element_name)) { - xmlChar *content; - - /* name */ - content = xmlNodeGetContent(node); - if (!content) { - ret = -LTTNG_ERR_NOMEM; - goto end; - } - - ret = lttng_strncpy(event->name, - (const char *) content, - LTTNG_SYMBOL_NAME_LEN); - if (ret == -1) { - WARN("Event \"%s\"'s name length (%zu) exceeds the maximal permitted length (%d) in session configuration", - (const char *) content, - strlen((const char *) content), - LTTNG_SYMBOL_NAME_LEN); - ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; - free(content); - goto end; - } - free(content); - } else if (!strcmp((const char *) node->name, - config_element_enabled)) { - xmlChar *content = xmlNodeGetContent(node); - - /* enabled */ - if (!content) { - ret = -LTTNG_ERR_NOMEM; - goto end; - } - - ret = parse_bool(content, &event->enabled); - free(content); - if (ret) { - ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; - goto end; - } - } else if (!strcmp((const char *) node->name, - config_element_type)) { - xmlChar *content = xmlNodeGetContent(node); - - /* type */ - if (!content) { - ret = -LTTNG_ERR_NOMEM; - goto end; - } - - ret = get_event_type(content); - free(content); - if (ret < 0) { - ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; - goto end; - } - - event->type = ret; - } else if (!strcmp((const char *) node->name, - config_element_loglevel_type)) { - xmlChar *content = xmlNodeGetContent(node); - - /* loglevel_type */ - if (!content) { - ret = -LTTNG_ERR_NOMEM; - goto end; - } - - ret = get_loglevel_type(content); - free(content); - if (ret < 0) { - ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; - goto end; - } - - event->loglevel_type = ret; - } else if (!strcmp((const char *) node->name, - config_element_loglevel)) { - xmlChar *content; - int64_t loglevel = 0; - - /* loglevel */ - content = xmlNodeGetContent(node); - if (!content) { - ret = -LTTNG_ERR_NOMEM; - goto end; - } - - ret = parse_int(content, &loglevel); - free(content); - if (ret) { - ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; - goto end; - } - - if (loglevel > INT_MAX || loglevel < INT_MIN) { - WARN("loglevel out of range."); - ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; - goto end; - } - - event->loglevel = loglevel; - } else if (!strcmp((const char *) node->name, - config_element_filter)) { - xmlChar *content = - xmlNodeGetContent(node); - - /* filter */ - if (!content) { - ret = -LTTNG_ERR_NOMEM; - goto end; - } - - free(filter_expression); - filter_expression = strdup((char *) content); - free(content); - if (!filter_expression) { - ret = -LTTNG_ERR_NOMEM; - goto end; - } - } else if (!strcmp((const char *) node->name, - config_element_exclusions)) { - xmlNodePtr exclusion_node; - int exclusion_index = 0; - - /* exclusions */ - if (exclusions) { - /* - * Exclusions has already been initialized, - * invalid file. - */ - ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; - goto end; - } - - exclusion_count = xmlChildElementCount(node); - if (!exclusion_count) { - continue; - } - - exclusions = zmalloc(exclusion_count * sizeof(char *)); - if (!exclusions) { - exclusion_count = 0; - ret = -LTTNG_ERR_NOMEM; - goto end; - } - - for (exclusion_node = xmlFirstElementChild(node); exclusion_node; - exclusion_node = xmlNextElementSibling(exclusion_node)) { - xmlChar *content = - xmlNodeGetContent(exclusion_node); - - if (!content) { - ret = -LTTNG_ERR_NOMEM; - goto end; - } - - exclusions[exclusion_index] = strdup((const char *) content); - free(content); - if (!exclusions[exclusion_index]) { - ret = -LTTNG_ERR_NOMEM; - goto end; - } - exclusion_index++; - } - - event->exclusion = 1; - } else if (!strcmp((const char *) node->name, - config_element_attributes)) { - xmlNodePtr attribute_node = xmlFirstElementChild(node); - - /* attributes */ - if (!attribute_node) { - ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; - goto end; - } - - if (!strcmp((const char *) attribute_node->name, - config_element_probe_attributes)) { - xmlNodePtr probe_attribute_node; - - /* probe_attributes */ - for (probe_attribute_node = - xmlFirstElementChild(attribute_node); probe_attribute_node; - probe_attribute_node = xmlNextElementSibling( - probe_attribute_node)) { - - ret = process_probe_attribute_node(probe_attribute_node, - &event->attr.probe); - if (ret) { - goto end; - } - } - } else if (!strcmp((const char *) attribute_node->name, - config_element_function_attributes)) { - size_t sym_len; - xmlChar *content; - xmlNodePtr symbol_node = xmlFirstElementChild(attribute_node); - - /* function_attributes */ - content = xmlNodeGetContent(symbol_node); - if (!content) { - ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; - goto end; - } - - sym_len = strlen((char *) content); - if (sym_len >= LTTNG_SYMBOL_NAME_LEN) { - WARN("Function name too long."); - ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; - free(content); - goto end; - } - - ret = lttng_strncpy( - event->attr.ftrace.symbol_name, - (char *) content, sym_len); - if (ret == -1) { - ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; - free(content); - goto end; - } - free(content); - } else if (!strcmp((const char *) attribute_node->name, - config_element_userspace_probe_tracepoint_attributes)) { - struct lttng_userspace_probe_location *location; - - location = process_userspace_probe_tracepoint_attribute_node(attribute_node); - if (!location) { - WARN("Error processing userspace probe tracepoint attribute"); - ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; - goto end; - } - ret = lttng_event_set_userspace_probe_location( - event, location); - if (ret) { - WARN("Error setting userspace probe location field"); - lttng_userspace_probe_location_destroy( - location); - ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; - goto end; - } - } else if (!strcmp((const char *) attribute_node->name, - config_element_userspace_probe_function_attributes)) { - struct lttng_userspace_probe_location *location; - - location = - process_userspace_probe_function_attribute_node( - attribute_node); - if (!location) { - WARN("Error processing userspace probe function attribute"); - ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; - goto end; - } - - ret = lttng_event_set_userspace_probe_location( - event, location); - if (ret) { - WARN("Error setting userspace probe location field"); - lttng_userspace_probe_location_destroy( - location); - ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; - goto end; - } - } else { - /* Unknown event attribute. */ - ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; - goto end; - } - } - } - - if ((event->enabled && phase == ENABLE) || phase == CREATION) { - ret = lttng_enable_event_with_exclusions(handle, event, channel_name, - filter_expression, exclusion_count, exclusions); - if (ret < 0) { - WARN("Enabling event (name:%s) on load failed.", event->name); - ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; - goto end; - } - } - ret = 0; -end: - for (i = 0; i < exclusion_count; i++) { - free(exclusions[i]); - } - - lttng_event_destroy(event); - free(exclusions); - free(filter_expression); - return ret; -} - -static -int process_events_node(xmlNodePtr events_node, struct lttng_handle *handle, - const char *channel_name) -{ - int ret = 0; - struct lttng_event event; - xmlNodePtr node; - - LTTNG_ASSERT(events_node); - LTTNG_ASSERT(handle); - LTTNG_ASSERT(channel_name); - - for (node = xmlFirstElementChild(events_node); node; - node = xmlNextElementSibling(node)) { - ret = process_event_node(node, handle, channel_name, CREATION); - if (ret) { - goto end; - } - } - - /* - * Disable all events to enable only the necessary events. - * Limitations regarding lttng_disable_events and tuple descriptor - * force this approach. - */ - memset(&event, 0, sizeof(event)); - event.loglevel = -1; - event.type = LTTNG_EVENT_ALL; - ret = lttng_disable_event_ext(handle, &event, channel_name, NULL); - if (ret) { - goto end; - } - - for (node = xmlFirstElementChild(events_node); node; - node = xmlNextElementSibling(node)) { - ret = process_event_node(node, handle, channel_name, ENABLE); - if (ret) { - goto end; - } - } - -end: - return ret; -} - -static -int process_channel_attr_node(xmlNodePtr attr_node, - struct lttng_channel *channel, xmlNodePtr *contexts_node, - xmlNodePtr *events_node) -{ - int ret; - - LTTNG_ASSERT(attr_node); - LTTNG_ASSERT(channel); - LTTNG_ASSERT(contexts_node); - LTTNG_ASSERT(events_node); - - if (!strcmp((const char *) attr_node->name, config_element_name)) { - xmlChar *content; - - /* name */ - content = xmlNodeGetContent(attr_node); - if (!content) { - ret = -LTTNG_ERR_NOMEM; - goto end; - } - - ret = lttng_strncpy(channel->name, - (const char *) content, - LTTNG_SYMBOL_NAME_LEN); - if (ret == -1) { - WARN("Channel \"%s\"'s name length (%zu) exceeds the maximal permitted length (%d) in session configuration", - (const char *) content, - strlen((const char *) content), - LTTNG_SYMBOL_NAME_LEN); - ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; - free(content); - goto end; - } - free(content); - } else if (!strcmp((const char *) attr_node->name, - config_element_enabled)) { - xmlChar *content; - int enabled; - - /* enabled */ - content = xmlNodeGetContent(attr_node); - if (!content) { - ret = -LTTNG_ERR_NOMEM; - goto end; - } - - ret = parse_bool(content, &enabled); - free(content); - if (ret) { - ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; - goto end; - } - - channel->enabled = enabled; - } else if (!strcmp((const char *) attr_node->name, - config_element_overwrite_mode)) { - xmlChar *content; - - /* overwrite_mode */ - content = xmlNodeGetContent(attr_node); - if (!content) { - ret = -LTTNG_ERR_NOMEM; - goto end; - } - - ret = get_overwrite_mode(content); - free(content); - if (ret < 0) { - ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; - goto end; - } - - channel->attr.overwrite = ret; - } else if (!strcmp((const char *) attr_node->name, - config_element_subbuf_size)) { - xmlChar *content; - - /* subbuffer_size */ - content = xmlNodeGetContent(attr_node); - if (!content) { - ret = -LTTNG_ERR_NOMEM; - goto end; - } - - ret = parse_uint(content, &channel->attr.subbuf_size); - free(content); - if (ret) { - ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; - goto end; - } - } else if (!strcmp((const char *) attr_node->name, - config_element_num_subbuf)) { - xmlChar *content; - - /* subbuffer_count */ - content = xmlNodeGetContent(attr_node); - if (!content) { - ret = -LTTNG_ERR_NOMEM; - goto end; - } - - ret = parse_uint(content, &channel->attr.num_subbuf); - free(content); - if (ret) { - ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; - goto end; - } - } else if (!strcmp((const char *) attr_node->name, - config_element_switch_timer_interval)) { - xmlChar *content; - uint64_t switch_timer_interval = 0; - - /* switch_timer_interval */ - content = xmlNodeGetContent(attr_node); - if (!content) { - ret = -LTTNG_ERR_NOMEM; - goto end; - } - - ret = parse_uint(content, &switch_timer_interval); - free(content); - if (ret) { - ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; - goto end; - } - - if (switch_timer_interval > UINT_MAX) { - WARN("switch_timer_interval out of range."); - ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; - goto end; - } - - channel->attr.switch_timer_interval = - switch_timer_interval; - } else if (!strcmp((const char *) attr_node->name, - config_element_read_timer_interval)) { - xmlChar *content; - uint64_t read_timer_interval = 0; - - /* read_timer_interval */ - content = xmlNodeGetContent(attr_node); - if (!content) { - ret = -LTTNG_ERR_NOMEM; - goto end; - } - - ret = parse_uint(content, &read_timer_interval); - free(content); - if (ret) { - ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; - goto end; - } - - if (read_timer_interval > UINT_MAX) { - WARN("read_timer_interval out of range."); - ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; - goto end; - } - - channel->attr.read_timer_interval = - read_timer_interval; - } else if (!strcmp((const char *) attr_node->name, - config_element_output_type)) { - xmlChar *content; - - /* output_type */ - content = xmlNodeGetContent(attr_node); - if (!content) { - ret = -LTTNG_ERR_NOMEM; - goto end; - } - - ret = get_output_type(content); - free(content); - if (ret < 0) { - ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; - goto end; - } - - channel->attr.output = ret; - } else if (!strcmp((const char *) attr_node->name, - config_element_tracefile_size)) { - xmlChar *content; - - /* tracefile_size */ - content = xmlNodeGetContent(attr_node); - if (!content) { - ret = -LTTNG_ERR_NOMEM; - goto end; - } - - ret = parse_uint(content, &channel->attr.tracefile_size); - free(content); - if (ret) { - ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; - goto end; - } - } else if (!strcmp((const char *) attr_node->name, - config_element_tracefile_count)) { - xmlChar *content; - - /* tracefile_count */ - content = xmlNodeGetContent(attr_node); - if (!content) { - ret = -LTTNG_ERR_NOMEM; - goto end; - } - - ret = parse_uint(content, &channel->attr.tracefile_count); - free(content); - if (ret) { - ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; - goto end; - } - } else if (!strcmp((const char *) attr_node->name, - config_element_live_timer_interval)) { - xmlChar *content; - uint64_t live_timer_interval = 0; - - /* live_timer_interval */ - content = xmlNodeGetContent(attr_node); - if (!content) { - ret = -LTTNG_ERR_NOMEM; - goto end; - } - - ret = parse_uint(content, &live_timer_interval); - free(content); - if (ret) { - ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; - goto end; - } - - if (live_timer_interval > UINT_MAX) { - WARN("live_timer_interval out of range."); - ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; - goto end; - } - - channel->attr.live_timer_interval = - live_timer_interval; - } else if (!strcmp((const char *) attr_node->name, - config_element_monitor_timer_interval)) { - xmlChar *content; - uint64_t monitor_timer_interval = 0; - - /* monitor_timer_interval */ - content = xmlNodeGetContent(attr_node); - if (!content) { - ret = -LTTNG_ERR_NOMEM; - goto end; - } - - ret = parse_uint(content, &monitor_timer_interval); - free(content); - if (ret) { - ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; - goto end; - } - - ret = lttng_channel_set_monitor_timer_interval(channel, - monitor_timer_interval); - if (ret) { - ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; - goto end; - } - } else if (!strcmp((const char *) attr_node->name, - config_element_blocking_timeout)) { - xmlChar *content; - int64_t blocking_timeout = 0; - - /* blocking_timeout */ - content = xmlNodeGetContent(attr_node); - if (!content) { - ret = -LTTNG_ERR_NOMEM; - goto end; - } - - ret = parse_int(content, &blocking_timeout); - free(content); - if (ret) { - ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; - goto end; - } - - ret = lttng_channel_set_blocking_timeout(channel, - blocking_timeout); - if (ret) { - ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; - goto end; - } - } else if (!strcmp((const char *) attr_node->name, - config_element_events)) { - /* events */ - *events_node = attr_node; - } else { - /* contexts */ - *contexts_node = attr_node; - } - ret = 0; -end: - return ret; -} - -static -int process_context_node(xmlNodePtr context_node, - struct lttng_handle *handle, const char *channel_name) -{ - int ret; - struct lttng_event_context context; - xmlNodePtr context_child_node = xmlFirstElementChild(context_node); - - LTTNG_ASSERT(handle); - LTTNG_ASSERT(channel_name); - - if (!context_child_node) { - ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; - goto end; - } - - memset(&context, 0, sizeof(context)); - - if (!strcmp((const char *) context_child_node->name, - config_element_type)) { - /* type */ - xmlChar *content = xmlNodeGetContent(context_child_node); - - if (!content) { - ret = -LTTNG_ERR_NOMEM; - goto end; - } - - ret = get_context_type(content); - free(content); - if (ret < 0) { - ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; - goto end; - } - - context.ctx = ret; - } else if (!strcmp((const char *) context_child_node->name, - config_element_context_perf)) { - /* perf */ - xmlNodePtr perf_attr_node; - - context.ctx = handle->domain.type == LTTNG_DOMAIN_KERNEL ? - LTTNG_EVENT_CONTEXT_PERF_CPU_COUNTER : - LTTNG_EVENT_CONTEXT_PERF_THREAD_COUNTER; - for (perf_attr_node = xmlFirstElementChild(context_child_node); - perf_attr_node; perf_attr_node = - xmlNextElementSibling(perf_attr_node)) { - if (!strcmp((const char *) perf_attr_node->name, - config_element_type)) { - xmlChar *content; - uint64_t type = 0; - - /* type */ - content = xmlNodeGetContent(perf_attr_node); - if (!content) { - ret = -LTTNG_ERR_NOMEM; - goto end; - } - - ret = parse_uint(content, &type); - free(content); - if (ret) { - ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; - goto end; - } - - if (type > UINT32_MAX) { - WARN("perf context type out of range."); - ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; - goto end; - } - - context.u.perf_counter.type = type; - } else if (!strcmp((const char *) perf_attr_node->name, - config_element_config)) { - xmlChar *content; - uint64_t config = 0; - - /* config */ - content = xmlNodeGetContent(perf_attr_node); - if (!content) { - ret = -LTTNG_ERR_NOMEM; - goto end; - } - - ret = parse_uint(content, &config); - free(content); - if (ret) { - ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; - goto end; - } - - context.u.perf_counter.config = config; - } else if (!strcmp((const char *) perf_attr_node->name, - config_element_name)) { - xmlChar *content; - - /* name */ - content = xmlNodeGetContent(perf_attr_node); - if (!content) { - ret = -LTTNG_ERR_NOMEM; - goto end; - } - - ret = lttng_strncpy(context.u.perf_counter.name, - (const char *) content, - LTTNG_SYMBOL_NAME_LEN); - if (ret == -1) { - WARN("Perf counter \"%s\"'s name length (%zu) exceeds the maximal permitted length (%d) in session configuration", - (const char *) content, - strlen((const char *) content), - LTTNG_SYMBOL_NAME_LEN); - ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; - free(content); - goto end; - } - free(content); - } - } - } else if (!strcmp((const char *) context_child_node->name, - config_element_context_app)) { - /* application context */ - xmlNodePtr app_ctx_node; - - context.ctx = LTTNG_EVENT_CONTEXT_APP_CONTEXT; - for (app_ctx_node = xmlFirstElementChild(context_child_node); - app_ctx_node; app_ctx_node = - xmlNextElementSibling(app_ctx_node)) { - xmlChar *content; - char **target = strcmp( - (const char *) app_ctx_node->name, - config_element_context_app_provider_name) == 0 ? - &context.u.app_ctx.provider_name : - &context.u.app_ctx.ctx_name; - - content = xmlNodeGetContent(app_ctx_node); - if (!content) { - ret = -LTTNG_ERR_NOMEM; - goto end; - } - - *target = (char *) content; - } - } else { - /* Unrecognized context type */ - ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; - goto end; - } - - ret = lttng_add_context(handle, &context, NULL, channel_name); - if (context.ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT) { - free(context.u.app_ctx.provider_name); - free(context.u.app_ctx.ctx_name); - } -end: - return ret; -} - -static -int process_contexts_node(xmlNodePtr contexts_node, - struct lttng_handle *handle, const char *channel_name) -{ - int ret = 0; - xmlNodePtr context_node; - - for (context_node = xmlFirstElementChild(contexts_node); context_node; - context_node = xmlNextElementSibling(context_node)) { - ret = process_context_node(context_node, handle, channel_name); - if (ret) { - goto end; - } - } -end: - return ret; -} - -static int get_tracker_elements(enum lttng_process_attr process_attr, - const char **element_id_tracker, - const char **element_value_type, - const char **element_value, - const char **element_value_alias, - const char **element_name) -{ - int ret = 0; - - switch (process_attr) { - case LTTNG_PROCESS_ATTR_PROCESS_ID: - *element_id_tracker = config_element_process_attr_tracker_pid; - *element_value_type = config_element_process_attr_pid_value; - *element_value = config_element_process_attr_id; - *element_value_alias = config_element_process_attr_id; - *element_name = NULL; - break; - case LTTNG_PROCESS_ATTR_VIRTUAL_PROCESS_ID: - *element_id_tracker = config_element_process_attr_tracker_vpid; - *element_value_type = config_element_process_attr_vpid_value; - *element_value = config_element_process_attr_id; - *element_value_alias = NULL; - *element_name = NULL; - break; - case LTTNG_PROCESS_ATTR_USER_ID: - *element_id_tracker = config_element_process_attr_tracker_uid; - *element_value_type = config_element_process_attr_uid_value; - *element_value = config_element_process_attr_id; - *element_value_alias = NULL; - *element_name = config_element_name; - break; - case LTTNG_PROCESS_ATTR_VIRTUAL_USER_ID: - *element_id_tracker = config_element_process_attr_tracker_vuid; - *element_value_type = config_element_process_attr_vuid_value; - *element_value = config_element_process_attr_id; - *element_value_alias = NULL; - *element_name = config_element_name; - break; - case LTTNG_PROCESS_ATTR_GROUP_ID: - *element_id_tracker = config_element_process_attr_tracker_gid; - *element_value_type = config_element_process_attr_gid_value; - *element_value = config_element_process_attr_id; - *element_value_alias = NULL; - *element_name = config_element_name; - break; - case LTTNG_PROCESS_ATTR_VIRTUAL_GROUP_ID: - *element_id_tracker = config_element_process_attr_tracker_vgid; - *element_value_type = config_element_process_attr_vgid_value; - *element_value = config_element_process_attr_id; - *element_value_alias = NULL; - *element_name = config_element_name; - break; - default: - ret = LTTNG_ERR_INVALID; - } - return ret; -} - -static int process_legacy_pid_tracker_node( - xmlNodePtr trackers_node, struct lttng_handle *handle) -{ - int ret = 0, child_count; - xmlNodePtr targets_node = NULL; - xmlNodePtr node; - const char *element_id_tracker; - const char *element_target_id; - const char *element_id; - const char *element_id_alias; - const char *element_name; - enum lttng_error_code tracker_handle_ret_code; - struct lttng_process_attr_tracker_handle *tracker_handle = NULL; - enum lttng_process_attr_tracker_handle_status status; - const enum lttng_process_attr process_attr = - handle->domain.type == LTTNG_DOMAIN_UST ? - LTTNG_PROCESS_ATTR_VIRTUAL_PROCESS_ID : - LTTNG_PROCESS_ATTR_PROCESS_ID; - - LTTNG_ASSERT(handle); - - tracker_handle_ret_code = lttng_session_get_tracker_handle( - handle->session_name, handle->domain.type, - process_attr, - &tracker_handle); - if (tracker_handle_ret_code != LTTNG_OK) { - ret = LTTNG_ERR_INVALID; - goto end; - } - - ret = get_tracker_elements(process_attr, &element_id_tracker, - &element_target_id, &element_id, &element_id_alias, - &element_name); - if (ret) { - goto end; - } - - /* Get the targets node */ - for (node = xmlFirstElementChild(trackers_node); node; - node = xmlNextElementSibling(node)) { - if (!strcmp((const char *) node->name, - config_element_tracker_targets_legacy)) { - targets_node = node; - break; - } - } - - if (!targets_node) { - ret = LTTNG_ERR_INVALID; - goto end; - } - - /* Go through all id target node */ - child_count = xmlChildElementCount(targets_node); - status = lttng_process_attr_tracker_handle_set_tracking_policy( - tracker_handle, - child_count == 0 ? LTTNG_TRACKING_POLICY_EXCLUDE_ALL : - LTTNG_TRACKING_POLICY_INCLUDE_SET); - if (status != LTTNG_PROCESS_ATTR_TRACKER_HANDLE_STATUS_OK) { - ret = LTTNG_ERR_UNK; - goto end; - } - - /* Add all tracked values. */ - for (node = xmlFirstElementChild(targets_node); node; - node = xmlNextElementSibling(node)) { - xmlNodePtr pid_target_node = node; - - /* get pid_target node and track it */ - for (node = xmlFirstElementChild(pid_target_node); node; - node = xmlNextElementSibling(node)) { - if (!strcmp((const char *) node->name, - config_element_tracker_pid_legacy)) { - int64_t id; - xmlChar *content = xmlNodeGetContent(node); - - if (!content) { - ret = LTTNG_ERR_LOAD_INVALID_CONFIG; - goto end; - } - - ret = parse_int(content, &id); - free(content); - if (ret) { - ret = LTTNG_ERR_LOAD_INVALID_CONFIG; - goto end; - } - - switch (process_attr) { - case LTTNG_PROCESS_ATTR_PROCESS_ID: - status = lttng_process_attr_process_id_tracker_handle_add_pid( - tracker_handle, - (pid_t) id); - break; - case LTTNG_PROCESS_ATTR_VIRTUAL_PROCESS_ID: - status = lttng_process_attr_virtual_process_id_tracker_handle_add_pid( - tracker_handle, - (pid_t) id); - break; - default: - ret = LTTNG_ERR_INVALID; - goto end; - } - } - switch (status) { - case LTTNG_PROCESS_ATTR_TRACKER_HANDLE_STATUS_OK: - continue; - case LTTNG_PROCESS_ATTR_TRACKER_HANDLE_STATUS_INVALID: - ret = LTTNG_ERR_INVALID; - break; - case LTTNG_PROCESS_ATTR_TRACKER_HANDLE_STATUS_EXISTS: - ret = LTTNG_ERR_PROCESS_ATTR_EXISTS; - break; - case LTTNG_PROCESS_ATTR_TRACKER_HANDLE_STATUS_MISSING: - ret = LTTNG_ERR_PROCESS_ATTR_MISSING; - break; - case LTTNG_PROCESS_ATTR_TRACKER_HANDLE_STATUS_ERROR: - case LTTNG_PROCESS_ATTR_TRACKER_HANDLE_STATUS_COMMUNICATION_ERROR: - default: - ret = LTTNG_ERR_UNK; - goto end; - } - } - node = pid_target_node; - } - -end: - lttng_process_attr_tracker_handle_destroy(tracker_handle); - return ret; - } - -static int process_id_tracker_node(xmlNodePtr id_tracker_node, - struct lttng_handle *handle, - enum lttng_process_attr process_attr) -{ - int ret = 0, child_count; - xmlNodePtr values_node = NULL; - xmlNodePtr node; - const char *element_id_tracker; - const char *element_target_id; - const char *element_id; - const char *element_id_alias; - const char *element_name; - enum lttng_error_code tracker_handle_ret_code; - struct lttng_process_attr_tracker_handle *tracker_handle = NULL; - enum lttng_process_attr_tracker_handle_status status; - - LTTNG_ASSERT(handle); - LTTNG_ASSERT(id_tracker_node); - - tracker_handle_ret_code = lttng_session_get_tracker_handle( - handle->session_name, handle->domain.type, process_attr, - &tracker_handle); - if (tracker_handle_ret_code != LTTNG_OK) { - ret = LTTNG_ERR_INVALID; - goto end; - } - - ret = get_tracker_elements(process_attr, &element_id_tracker, - &element_target_id, &element_id, &element_id_alias, - &element_name); - if (ret) { - goto end; - } - - /* get the values node */ - for (node = xmlFirstElementChild(id_tracker_node); node; - node = xmlNextElementSibling(node)) { - if (!strcmp((const char *) node->name, - config_element_process_attr_values)) { - values_node = node; - break; - } - } - - if (!values_node) { - ret = LTTNG_ERR_INVALID; - goto end; - } - - /* Go through all id target node */ - child_count = xmlChildElementCount(values_node); - status = lttng_process_attr_tracker_handle_set_tracking_policy( - tracker_handle, - child_count == 0 ? LTTNG_TRACKING_POLICY_EXCLUDE_ALL : - LTTNG_TRACKING_POLICY_INCLUDE_SET); - if (status != LTTNG_PROCESS_ATTR_TRACKER_HANDLE_STATUS_OK) { - ret = LTTNG_ERR_UNK; - goto end; - } - - /* Add all tracked values. */ - for (node = xmlFirstElementChild(values_node); node; - node = xmlNextElementSibling(node)) { - xmlNodePtr id_target_node = node; - - /* get id node and track it */ - for (node = xmlFirstElementChild(id_target_node); node; - node = xmlNextElementSibling(node)) { - if (!strcmp((const char *) node->name, element_id) || - (element_id_alias && - !strcmp((const char *) node->name, - element_id_alias))) { - int64_t id; - xmlChar *content = xmlNodeGetContent(node); - - if (!content) { - ret = LTTNG_ERR_LOAD_INVALID_CONFIG; - goto end; - } - - ret = parse_int(content, &id); - free(content); - if (ret) { - ret = LTTNG_ERR_LOAD_INVALID_CONFIG; - goto end; - } - - switch (process_attr) { - case LTTNG_PROCESS_ATTR_PROCESS_ID: - status = lttng_process_attr_process_id_tracker_handle_add_pid( - tracker_handle, - (pid_t) id); - break; - case LTTNG_PROCESS_ATTR_VIRTUAL_PROCESS_ID: - status = lttng_process_attr_virtual_process_id_tracker_handle_add_pid( - tracker_handle, - (pid_t) id); - break; - case LTTNG_PROCESS_ATTR_USER_ID: - status = lttng_process_attr_user_id_tracker_handle_add_uid( - tracker_handle, - (uid_t) id); - break; - case LTTNG_PROCESS_ATTR_VIRTUAL_USER_ID: - status = lttng_process_attr_virtual_user_id_tracker_handle_add_uid( - tracker_handle, - (uid_t) id); - break; - case LTTNG_PROCESS_ATTR_GROUP_ID: - status = lttng_process_attr_group_id_tracker_handle_add_gid( - tracker_handle, - (gid_t) id); - break; - case LTTNG_PROCESS_ATTR_VIRTUAL_GROUP_ID: - status = lttng_process_attr_virtual_group_id_tracker_handle_add_gid( - tracker_handle, - (gid_t) id); - break; - default: - ret = LTTNG_ERR_INVALID; - goto end; - } - } else if (element_name && - !strcmp((const char *) node->name, - element_name)) { - xmlChar *content = xmlNodeGetContent(node); - - if (!content) { - ret = LTTNG_ERR_LOAD_INVALID_CONFIG; - goto end; - } - - switch (process_attr) { - case LTTNG_PROCESS_ATTR_USER_ID: - status = lttng_process_attr_user_id_tracker_handle_add_user_name( - tracker_handle, - (const char *) content); - break; - case LTTNG_PROCESS_ATTR_VIRTUAL_USER_ID: - status = lttng_process_attr_virtual_user_id_tracker_handle_add_user_name( - tracker_handle, - (const char *) content); - break; - case LTTNG_PROCESS_ATTR_GROUP_ID: - status = lttng_process_attr_group_id_tracker_handle_add_group_name( - tracker_handle, - (const char *) content); - break; - case LTTNG_PROCESS_ATTR_VIRTUAL_GROUP_ID: - status = lttng_process_attr_virtual_group_id_tracker_handle_add_group_name( - tracker_handle, - (const char *) content); - break; - default: - free(content); - ret = LTTNG_ERR_INVALID; - goto end; - } - free(content); - } - switch (status) { - case LTTNG_PROCESS_ATTR_TRACKER_HANDLE_STATUS_OK: - continue; - case LTTNG_PROCESS_ATTR_TRACKER_HANDLE_STATUS_INVALID: - ret = LTTNG_ERR_INVALID; - break; - case LTTNG_PROCESS_ATTR_TRACKER_HANDLE_STATUS_EXISTS: - ret = LTTNG_ERR_PROCESS_ATTR_EXISTS; - break; - case LTTNG_PROCESS_ATTR_TRACKER_HANDLE_STATUS_MISSING: - ret = LTTNG_ERR_PROCESS_ATTR_MISSING; - break; - case LTTNG_PROCESS_ATTR_TRACKER_HANDLE_STATUS_ERROR: - case LTTNG_PROCESS_ATTR_TRACKER_HANDLE_STATUS_COMMUNICATION_ERROR: - default: - ret = LTTNG_ERR_UNK; - goto end; - } - } - node = id_target_node; - } - -end: - lttng_process_attr_tracker_handle_destroy(tracker_handle); - return ret; -} - -static -int process_domain_node(xmlNodePtr domain_node, const char *session_name) -{ - int ret; - struct lttng_domain domain = { 0 }; - struct lttng_handle *handle = NULL; - struct lttng_channel *channel = NULL; - xmlNodePtr channels_node = NULL; - xmlNodePtr trackers_node = NULL; - xmlNodePtr pid_tracker_node = NULL; - xmlNodePtr vpid_tracker_node = NULL; - xmlNodePtr uid_tracker_node = NULL; - xmlNodePtr vuid_tracker_node = NULL; - xmlNodePtr gid_tracker_node = NULL; - xmlNodePtr vgid_tracker_node = NULL; - xmlNodePtr node; - - LTTNG_ASSERT(session_name); - - ret = init_domain(domain_node, &domain); - if (ret) { - goto end; - } - - handle = lttng_create_handle(session_name, &domain); - if (!handle) { - ret = -LTTNG_ERR_NOMEM; - goto end; - } - - /* get the channels node */ - for (node = xmlFirstElementChild(domain_node); node; - node = xmlNextElementSibling(node)) { - if (!strcmp((const char *) node->name, - config_element_channels)) { - channels_node = node; - break; - } - } - - if (!channels_node) { - goto end; - } - - /* create all channels */ - for (node = xmlFirstElementChild(channels_node); node; - node = xmlNextElementSibling(node)) { - const enum lttng_domain_type original_domain = domain.type; - xmlNodePtr contexts_node = NULL; - xmlNodePtr events_node = NULL; - xmlNodePtr channel_attr_node; - - /* - * Channels of the "agent" types cannot be created directly. - * They are meant to be created implicitly through the - * activation of events in their domain. However, a user - * can override the default channel configuration attributes - * by creating the underlying UST channel _before_ enabling - * an agent domain event. - * - * Hence, the channel's type is substituted before the creation - * and restored by the time the events are created. - */ - switch (domain.type) { - case LTTNG_DOMAIN_JUL: - case LTTNG_DOMAIN_LOG4J: - case LTTNG_DOMAIN_PYTHON: - domain.type = LTTNG_DOMAIN_UST; - default: - break; - } - - channel = lttng_channel_create(&domain); - if (!channel) { - ret = -1; - goto end; - } - - for (channel_attr_node = xmlFirstElementChild(node); - channel_attr_node; channel_attr_node = - xmlNextElementSibling(channel_attr_node)) { - ret = process_channel_attr_node(channel_attr_node, - channel, &contexts_node, &events_node); - if (ret) { - goto end; - } - } - - ret = lttng_enable_channel(handle, channel); - if (ret < 0) { - goto end; - } - - /* Restore the original channel domain. */ - domain.type = original_domain; - - ret = process_events_node(events_node, handle, channel->name); - if (ret) { - goto end; - } - - ret = process_contexts_node(contexts_node, handle, - channel->name); - if (ret) { - goto end; - } - - lttng_channel_destroy(channel); - } - channel = NULL; - - /* get the trackers node */ - for (node = xmlFirstElementChild(domain_node); node; - node = xmlNextElementSibling(node)) { - if (!strcmp((const char *) node->name, - config_element_process_attr_trackers) || - !strcmp((const char *) node->name, - config_element_trackers_legacy)) { - if (trackers_node) { - ERR("Only one instance of `%s` or `%s` is allowed in a session configuration", - config_element_process_attr_trackers, - config_element_trackers_legacy); - ret = -1; - goto end; - } - trackers_node = node; - break; - } - } - - if (!trackers_node) { - goto end; - } - - for (node = xmlFirstElementChild(trackers_node); node; - node = xmlNextElementSibling(node)) { - if (!strcmp((const char *) node->name, - config_element_process_attr_tracker_pid)) { - pid_tracker_node = node; - ret = process_id_tracker_node(pid_tracker_node, handle, - LTTNG_PROCESS_ATTR_PROCESS_ID); - if (ret) { - goto end; - } - } - if (!strcmp((const char *) node->name, - config_element_process_attr_tracker_vpid)) { - vpid_tracker_node = node; - ret = process_id_tracker_node(vpid_tracker_node, handle, - LTTNG_PROCESS_ATTR_VIRTUAL_PROCESS_ID); - if (ret) { - goto end; - } - } - if (!strcmp((const char *) node->name, - config_element_process_attr_tracker_uid)) { - uid_tracker_node = node; - ret = process_id_tracker_node(uid_tracker_node, handle, - LTTNG_PROCESS_ATTR_USER_ID); - if (ret) { - goto end; - } - } - if (!strcmp((const char *) node->name, - config_element_process_attr_tracker_vuid)) { - vuid_tracker_node = node; - ret = process_id_tracker_node(vuid_tracker_node, handle, - LTTNG_PROCESS_ATTR_VIRTUAL_USER_ID); - if (ret) { - goto end; - } - } - if (!strcmp((const char *) node->name, - config_element_process_attr_tracker_gid)) { - gid_tracker_node = node; - ret = process_id_tracker_node(gid_tracker_node, handle, - LTTNG_PROCESS_ATTR_GROUP_ID); - if (ret) { - goto end; - } - } - if (!strcmp((const char *) node->name, - config_element_process_attr_tracker_vgid)) { - vgid_tracker_node = node; - ret = process_id_tracker_node(vgid_tracker_node, handle, - LTTNG_PROCESS_ATTR_VIRTUAL_GROUP_ID); - if (ret) { - goto end; - } - } - if (!strcmp((const char *) node->name, - config_element_pid_tracker_legacy)) { - ret = process_legacy_pid_tracker_node(node, handle); - if (ret) { - goto end; - } - } - } - -end: - lttng_channel_destroy(channel); - lttng_destroy_handle(handle); - return ret; -} - -static -int add_periodic_rotation(const char *name, uint64_t time_us) -{ - int ret; - enum lttng_rotation_status status; - struct lttng_rotation_schedule *periodic = - lttng_rotation_schedule_periodic_create(); - - if (!periodic) { - ret = -LTTNG_ERR_NOMEM; - goto error; - } - - status = lttng_rotation_schedule_periodic_set_period(periodic, - time_us); - if (status != LTTNG_ROTATION_STATUS_OK) { - ret = -LTTNG_ERR_INVALID; - goto error; - } - - status = lttng_session_add_rotation_schedule(name, periodic); - switch (status) { - case LTTNG_ROTATION_STATUS_OK: - ret = 0; - break; - case LTTNG_ROTATION_STATUS_SCHEDULE_ALREADY_SET: - case LTTNG_ROTATION_STATUS_INVALID: - ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; - break; - default: - ret = -LTTNG_ERR_UNK; - break; - } -error: - lttng_rotation_schedule_destroy(periodic); - return ret; -} - -static -int add_size_rotation(const char *name, uint64_t size_bytes) -{ - int ret; - enum lttng_rotation_status status; - struct lttng_rotation_schedule *size = - lttng_rotation_schedule_size_threshold_create(); - - if (!size) { - ret = -LTTNG_ERR_NOMEM; - goto error; - } - - status = lttng_rotation_schedule_size_threshold_set_threshold(size, - size_bytes); - if (status != LTTNG_ROTATION_STATUS_OK) { - ret = -LTTNG_ERR_INVALID; - goto error; - } - - status = lttng_session_add_rotation_schedule(name, size); - switch (status) { - case LTTNG_ROTATION_STATUS_OK: - ret = 0; - break; - case LTTNG_ROTATION_STATUS_SCHEDULE_ALREADY_SET: - case LTTNG_ROTATION_STATUS_INVALID: - ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; - break; - default: - ret = -LTTNG_ERR_UNK; - break; - } -error: - lttng_rotation_schedule_destroy(size); - return ret; -} - -static -int process_session_rotation_schedules_node( - xmlNodePtr schedules_node, - uint64_t *rotation_timer_interval, - uint64_t *rotation_size) -{ - int ret = 0; - xmlNodePtr child; - - for (child = xmlFirstElementChild(schedules_node); - child; - child = xmlNextElementSibling(child)) { - if (!strcmp((const char *) child->name, - config_element_rotation_schedule_periodic)) { - xmlChar *content; - xmlNodePtr time_us_node; - - /* periodic rotation schedule */ - time_us_node = xmlFirstElementChild(child); - if (!time_us_node || - strcmp((const char *) time_us_node->name, - config_element_rotation_schedule_periodic_time_us)) { - ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; - goto end; - } - - /* time_us child */ - content = xmlNodeGetContent(time_us_node); - if (!content) { - ret = -LTTNG_ERR_NOMEM; - goto end; - } - ret = parse_uint(content, rotation_timer_interval); - free(content); - if (ret) { - ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; - goto end; - } - } else if (!strcmp((const char *) child->name, - config_element_rotation_schedule_size_threshold)) { - xmlChar *content; - xmlNodePtr bytes_node; - - /* size_threshold rotation schedule */ - bytes_node = xmlFirstElementChild(child); - if (!bytes_node || - strcmp((const char *) bytes_node->name, - config_element_rotation_schedule_size_threshold_bytes)) { - ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; - goto end; - } - - /* bytes child */ - content = xmlNodeGetContent(bytes_node); - if (!content) { - ret = -LTTNG_ERR_NOMEM; - goto end; - } - ret = parse_uint(content, rotation_size); - free(content); - if (ret) { - ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; - goto end; - } - } - } - -end: - return ret; -} - -static -int process_session_node(xmlNodePtr session_node, const char *session_name, - int overwrite, - const struct config_load_session_override_attr *overrides) -{ - int ret, started = -1, snapshot_mode = -1; - uint64_t live_timer_interval = UINT64_MAX, - rotation_timer_interval = 0, - rotation_size = 0; - xmlChar *name = NULL; - xmlChar *shm_path = NULL; - xmlNodePtr domains_node = NULL; - xmlNodePtr output_node = NULL; - xmlNodePtr node; - xmlNodePtr attributes_child; - struct lttng_domain *kernel_domain = NULL; - struct lttng_domain *ust_domain = NULL; - struct lttng_domain *jul_domain = NULL; - struct lttng_domain *log4j_domain = NULL; - struct lttng_domain *python_domain = NULL; - - for (node = xmlFirstElementChild(session_node); node; - node = xmlNextElementSibling(node)) { - if (!name && !strcmp((const char *) node->name, - config_element_name)) { - /* name */ - xmlChar *node_content = xmlNodeGetContent(node); - if (!node_content) { - ret = -LTTNG_ERR_NOMEM; - goto error; - } - - name = node_content; - } else if (!domains_node && !strcmp((const char *) node->name, - config_element_domains)) { - /* domains */ - domains_node = node; - } else if (started == -1 && !strcmp((const char *) node->name, - config_element_started)) { - /* started */ - xmlChar *node_content = xmlNodeGetContent(node); - if (!node_content) { - ret = -LTTNG_ERR_NOMEM; - goto error; - } - - ret = parse_bool(node_content, &started); - free(node_content); - if (ret) { - ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; - goto error; - } - } else if (!output_node && !strcmp((const char *) node->name, - config_element_output)) { - /* output */ - output_node = node; - } else if (!shm_path && !strcmp((const char *) node->name, - config_element_shared_memory_path)) { - /* shared memory path */ - xmlChar *node_content = xmlNodeGetContent(node); - if (!node_content) { - ret = -LTTNG_ERR_NOMEM; - goto error; - } - - shm_path = node_content; - } else { - /* - * attributes, snapshot_mode, live_timer_interval, rotation_size, - * rotation_timer_interval. - */ - for (attributes_child = xmlFirstElementChild(node); attributes_child; - attributes_child = xmlNextElementSibling(attributes_child)) { - if (!strcmp((const char *) attributes_child->name, - config_element_snapshot_mode)) { - /* snapshot_mode */ - xmlChar *snapshot_mode_content = - xmlNodeGetContent(attributes_child); - if (!snapshot_mode_content) { - ret = -LTTNG_ERR_NOMEM; - goto error; - } - - ret = parse_bool(snapshot_mode_content, &snapshot_mode); - free(snapshot_mode_content); - if (ret) { - ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; - goto error; - } - } else if (!strcmp((const char *) attributes_child->name, - config_element_live_timer_interval)) { - /* live_timer_interval */ - xmlChar *timer_interval_content = - xmlNodeGetContent(attributes_child); - if (!timer_interval_content) { - ret = -LTTNG_ERR_NOMEM; - goto error; - } - - ret = parse_uint(timer_interval_content, &live_timer_interval); - free(timer_interval_content); - if (ret) { - ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; - goto error; - } - } else if (!strcmp((const char *) attributes_child->name, - config_element_rotation_schedules)) { - ret = process_session_rotation_schedules_node( - attributes_child, - &rotation_timer_interval, - &rotation_size); - if (ret) { - ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; - goto error; - } - - } - } - } - } - - if (!name) { - /* Mandatory attribute, as defined in the session XSD */ - ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; - goto error; - } - - if (session_name && strcmp((char *) name, session_name)) { - /* This is not the session we are looking for */ - ret = -LTTNG_ERR_NO_SESSION; - goto error; - } - - /* Init domains to create the session handles */ - for (node = xmlFirstElementChild(domains_node); node; - node = xmlNextElementSibling(node)) { - struct lttng_domain *domain; - - domain = zmalloc(sizeof(*domain)); - if (!domain) { - ret = -LTTNG_ERR_NOMEM; - goto error; - } - - ret = init_domain(node, domain); - if (ret) { - goto domain_init_error; - } - - switch (domain->type) { - case LTTNG_DOMAIN_KERNEL: - if (kernel_domain) { - /* Same domain seen twice, invalid! */ - goto domain_init_error; - } - kernel_domain = domain; - break; - case LTTNG_DOMAIN_UST: - if (ust_domain) { - /* Same domain seen twice, invalid! */ - goto domain_init_error; - } - ust_domain = domain; - break; - case LTTNG_DOMAIN_JUL: - if (jul_domain) { - /* Same domain seen twice, invalid! */ - goto domain_init_error; - } - jul_domain = domain; - break; - case LTTNG_DOMAIN_LOG4J: - if (log4j_domain) { - /* Same domain seen twice, invalid! */ - goto domain_init_error; - } - log4j_domain = domain; - break; - case LTTNG_DOMAIN_PYTHON: - if (python_domain) { - /* Same domain seen twice, invalid! */ - goto domain_init_error; - } - python_domain = domain; - break; - default: - WARN("Invalid domain type"); - goto domain_init_error; - } - continue; -domain_init_error: - free(domain); - ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; - goto error; - } - - /* Apply overrides */ - if (overrides) { - if (overrides->session_name) { - xmlChar *name_override = xmlStrdup(BAD_CAST(overrides->session_name)); - if (!name_override) { - ret = -LTTNG_ERR_NOMEM; - goto error; - } - - /* Overrides the session name to the provided name */ - xmlFree(name); - name = name_override; - } - } - - if (overwrite) { - /* Destroy session if it exists */ - ret = lttng_destroy_session((const char *) name); - if (ret && ret != -LTTNG_ERR_SESS_NOT_FOUND) { - ERR("Failed to destroy existing session."); - goto error; - } - } - - /* Create session type depending on output type */ - if (snapshot_mode && snapshot_mode != -1) { - ret = create_snapshot_session((const char *) name, output_node, - overrides); - } else if (live_timer_interval && - live_timer_interval != UINT64_MAX) { - ret = create_session((const char *) name, - output_node, live_timer_interval, overrides); - } else { - /* regular session */ - ret = create_session((const char *) name, - output_node, UINT64_MAX, overrides); - } - if (ret) { - goto error; - } - - if (shm_path) { - ret = lttng_set_session_shm_path((const char *) name, - (const char *) shm_path); - if (ret) { - goto error; - } - } - - for (node = xmlFirstElementChild(domains_node); node; - node = xmlNextElementSibling(node)) { - ret = process_domain_node(node, (const char *) name); - if (ret) { - goto end; - } - } - - if (rotation_timer_interval) { - ret = add_periodic_rotation((const char *) name, - rotation_timer_interval); - if (ret < 0) { - goto error; - } - } - if (rotation_size) { - ret = add_size_rotation((const char *) name, - rotation_size); - if (ret < 0) { - goto error; - } - } - - if (started) { - ret = lttng_start_tracing((const char *) name); - if (ret) { - goto end; - } - } - -end: - if (ret < 0) { - ERR("Failed to load session %s: %s", (const char *) name, - lttng_strerror(ret)); - lttng_destroy_session((const char *) name); - } - -error: - free(kernel_domain); - free(ust_domain); - free(jul_domain); - free(log4j_domain); - free(python_domain); - xmlFree(name); - xmlFree(shm_path); - return ret; -} - -/* - * Return 1 if the given path is readable by the current UID or 0 if not. - * Return -1 if the path is EPERM. - */ -static int validate_file_read_creds(const char *path) -{ - int ret; - - LTTNG_ASSERT(path); - - /* Can we read the file. */ - ret = access(path, R_OK); - if (!ret) { - goto valid; - } - if (errno == EACCES) { - return -1; - } else { - /* Invalid. */ - return 0; - } -valid: - return 1; -} - -static -int load_session_from_file(const char *path, const char *session_name, - struct session_config_validation_ctx *validation_ctx, int overwrite, - const struct config_load_session_override_attr *overrides) -{ - int ret, session_found = !session_name; - xmlDocPtr doc = NULL; - xmlNodePtr sessions_node; - xmlNodePtr session_node; - - LTTNG_ASSERT(path); - LTTNG_ASSERT(validation_ctx); - - ret = validate_file_read_creds(path); - if (ret != 1) { - if (ret == -1) { - ret = -LTTNG_ERR_EPERM; - } else { - ret = -LTTNG_ERR_LOAD_SESSION_NOENT; - } - goto end; - } - - doc = xmlParseFile(path); - if (!doc) { - ret = -LTTNG_ERR_LOAD_IO_FAIL; - goto end; - } - - ret = xmlSchemaValidateDoc(validation_ctx->schema_validation_ctx, doc); - if (ret) { - ERR("Session configuration file validation failed"); - ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; - goto end; - } - - sessions_node = xmlDocGetRootElement(doc); - if (!sessions_node) { - ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; - goto end; - } - - for (session_node = xmlFirstElementChild(sessions_node); - session_node; session_node = - xmlNextElementSibling(session_node)) { - ret = process_session_node(session_node, - session_name, overwrite, overrides); - if (!session_name && ret) { - /* Loading error occurred. */ - goto end; - } else if (session_name) { - if (ret == 0) { - /* Target session found and loaded */ - session_found = 1; - break; - } else if (ret == -LTTNG_ERR_NO_SESSION) { - /* - * Ignore this error, we are looking for a - * specific session. - */ - ret = 0; - } else { - /* Loading error occurred. */ - goto end; - } - } - } -end: - xmlFreeDoc(doc); - if (!ret) { - ret = session_found ? 0 : -LTTNG_ERR_LOAD_SESSION_NOENT; - } - return ret; -} - -static -int load_session_from_path(const char *path, const char *session_name, - struct session_config_validation_ctx *validation_ctx, int overwrite, - const struct config_load_session_override_attr *overrides) -{ - int ret, session_found = !session_name; - DIR *directory = NULL; - struct lttng_dynamic_buffer file_path; - size_t path_len; - - LTTNG_ASSERT(path); - LTTNG_ASSERT(validation_ctx); - path_len = strlen(path); - lttng_dynamic_buffer_init(&file_path); - if (path_len >= LTTNG_PATH_MAX) { - ERR("Session configuration load path \"%s\" length (%zu) exceeds the maximal length allowed (%d)", - path, path_len, LTTNG_PATH_MAX); - ret = -LTTNG_ERR_INVALID; - goto end; - } - - directory = opendir(path); - if (!directory) { - switch (errno) { - case ENOTDIR: - /* Try the file loading. */ - break; - case ENOENT: - ret = -LTTNG_ERR_LOAD_SESSION_NOENT; - goto end; - default: - ret = -LTTNG_ERR_LOAD_IO_FAIL; - goto end; - } - } - if (directory) { - size_t file_path_root_len; - - ret = lttng_dynamic_buffer_set_capacity(&file_path, - LTTNG_PATH_MAX); - if (ret) { - ret = -LTTNG_ERR_NOMEM; - goto end; - } - - ret = lttng_dynamic_buffer_append(&file_path, path, path_len); - if (ret) { - ret = -LTTNG_ERR_NOMEM; - goto end; - } - - if (file_path.data[file_path.size - 1] != '/') { - ret = lttng_dynamic_buffer_append(&file_path, "/", 1); - if (ret) { - ret = -LTTNG_ERR_NOMEM; - goto end; - } - } - file_path_root_len = file_path.size; - - /* Search for *.lttng files */ - for (;;) { - size_t file_name_len; - struct dirent *result; - - /* - * When the end of the directory stream is reached, NULL - * is returned and errno is kept unchanged. When an - * error occurs, NULL is returned and errno is set - * accordingly. To distinguish between the two, set - * errno to zero before calling readdir(). - * - * On success, readdir() returns a pointer to a dirent - * structure. This structure may be statically - * allocated, do not attempt to free(3) it. - */ - errno = 0; - result = readdir(directory); - - /* Reached end of dir stream or error out. */ - if (!result) { - if (errno) { - PERROR("Failed to enumerate the contents of path \"%s\" while loading session, readdir returned", path); - ret = -LTTNG_ERR_LOAD_IO_FAIL; - goto end; - } - break; - } - - file_name_len = strlen(result->d_name); - - if (file_name_len <= - sizeof(DEFAULT_SESSION_CONFIG_FILE_EXTENSION)) { - continue; - } - - if (file_path.size + file_name_len >= LTTNG_PATH_MAX) { - WARN("Ignoring file \"%s\" since the path's length (%zu) would exceed the maximal permitted size (%d)", - result->d_name, - /* +1 to account for NULL terminator. */ - file_path.size + file_name_len + 1, - LTTNG_PATH_MAX); - continue; - } - - /* Does the file end with .lttng? */ - if (strcmp(DEFAULT_SESSION_CONFIG_FILE_EXTENSION, - result->d_name + file_name_len - sizeof( - DEFAULT_SESSION_CONFIG_FILE_EXTENSION) + 1)) { - continue; - } - - ret = lttng_dynamic_buffer_append(&file_path, result->d_name, - file_name_len + 1); - if (ret) { - ret = -LTTNG_ERR_NOMEM; - goto end; - } - - ret = load_session_from_file(file_path.data, session_name, - validation_ctx, overwrite, overrides); - if (session_name && - (!ret || ret != -LTTNG_ERR_LOAD_SESSION_NOENT)) { - session_found = 1; - break; - } - if (ret && ret != -LTTNG_ERR_LOAD_SESSION_NOENT) { - goto end; - } - /* - * Reset the buffer's size to the location of the - * path's trailing '/'. - */ - ret = lttng_dynamic_buffer_set_size(&file_path, - file_path_root_len); - if (ret) { - ret = -LTTNG_ERR_UNK; - goto end; - } - } - } else { - ret = load_session_from_file(path, session_name, - validation_ctx, overwrite, overrides); - if (ret) { - goto end; - } - session_found = 1; - } - - ret = 0; -end: - if (directory) { - if (closedir(directory)) { - PERROR("closedir"); - } - } - if (!ret && !session_found) { - ret = -LTTNG_ERR_LOAD_SESSION_NOENT; - } - lttng_dynamic_buffer_reset(&file_path); - return ret; -} - -/* - * Validate that the given path's credentials and the current process have the - * same UID. If so, return 1 else return 0 if it does NOT match. - */ -static int validate_path_creds(const char *path) -{ - int ret, uid = getuid(); - struct stat buf; - - LTTNG_ASSERT(path); - - if (uid == 0) { - goto valid; - } - - ret = stat(path, &buf); - if (ret < 0) { - if (errno != ENOENT) { - PERROR("stat"); - } - goto valid; - } - - if (buf.st_uid != uid) { - goto invalid; - } - -valid: - return 1; -invalid: - return 0; -} - -int config_load_session(const char *path, const char *session_name, - int overwrite, unsigned int autoload, - const struct config_load_session_override_attr *overrides) -{ - int ret; - bool session_loaded = false; - const char *path_ptr = NULL; - struct session_config_validation_ctx validation_ctx = { 0 }; - - ret = init_session_config_validation_ctx(&validation_ctx); - if (ret) { - goto end; - } - - if (!path) { - const char *home_path; - const char *sys_path; - - /* Try home path */ - home_path = utils_get_home_dir(); - if (home_path) { - char path_buf[PATH_MAX]; - - /* - * Try user session configuration path. Ignore error here so we can - * continue loading the system wide sessions. - */ - if (autoload) { - ret = snprintf(path_buf, sizeof(path_buf), - DEFAULT_SESSION_HOME_CONFIGPATH - "/" DEFAULT_SESSION_CONFIG_AUTOLOAD, - home_path); - if (ret < 0) { - PERROR("snprintf session autoload home config path"); - ret = -LTTNG_ERR_INVALID; - goto end; - } - - /* - * Credentials are only validated for the autoload in order to - * avoid any user session daemon to try to load kernel sessions - * automatically and failing all the times. - */ - ret = validate_path_creds(path_buf); - if (ret) { - path_ptr = path_buf; - } - } else { - ret = snprintf(path_buf, sizeof(path_buf), - DEFAULT_SESSION_HOME_CONFIGPATH, - home_path); - if (ret < 0) { - PERROR("snprintf session home config path"); - ret = -LTTNG_ERR_INVALID; - goto end; - } - path_ptr = path_buf; - } - if (path_ptr) { - ret = load_session_from_path(path_ptr, session_name, - &validation_ctx, overwrite, overrides); - if (ret && ret != -LTTNG_ERR_LOAD_SESSION_NOENT) { - goto end; - } - /* - * Continue even if the session was found since we have to try - * the system wide sessions. - */ - session_loaded = true; - } - } - - /* Reset path pointer for the system wide dir. */ - path_ptr = NULL; - - /* Try system wide configuration directory. */ - if (autoload) { - sys_path = DEFAULT_SESSION_SYSTEM_CONFIGPATH "/" - DEFAULT_SESSION_CONFIG_AUTOLOAD; - ret = validate_path_creds(sys_path); - if (ret) { - path_ptr = sys_path; - } - } else { - sys_path = DEFAULT_SESSION_SYSTEM_CONFIGPATH; - path_ptr = sys_path; - } - - if (path_ptr) { - ret = load_session_from_path(path_ptr, session_name, - &validation_ctx, overwrite, overrides); - if (!ret) { - session_loaded = true; - } - } else { - ret = 0; - } - } else { - ret = access(path, F_OK); - if (ret < 0) { - PERROR("access"); - switch (errno) { - case ENOENT: - ret = -LTTNG_ERR_INVALID; - WARN("Session configuration path does not exist."); - break; - case EACCES: - ret = -LTTNG_ERR_EPERM; - break; - default: - ret = -LTTNG_ERR_UNK; - break; - } - goto end; - } - - ret = load_session_from_path(path, session_name, - &validation_ctx, overwrite, overrides); - } -end: - fini_session_config_validation_ctx(&validation_ctx); - if (ret == -LTTNG_ERR_LOAD_SESSION_NOENT && !session_name && !path) { - /* - * Don't report an error if no sessions are found when called - * without a session_name or a search path. - */ - ret = 0; - } - - if (session_loaded && ret == -LTTNG_ERR_LOAD_SESSION_NOENT) { - /* A matching session was found in one of the search paths. */ - ret = 0; - } - return ret; -} - -static -void __attribute__((destructor)) session_config_exit(void) -{ - xmlCleanupParser(); -} diff --git a/src/common/config/session-config.cpp b/src/common/config/session-config.cpp new file mode 100644 index 000000000..4d57d581a --- /dev/null +++ b/src/common/config/session-config.cpp @@ -0,0 +1,4152 @@ +/* + * Copyright (C) 2013 Jérémie Galarneau + * + * SPDX-License-Identifier: GPL-2.0-only + * + */ + +#include "lttng/tracker.h" +#define _LGPL_SOURCE +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "session-config.h" +#include "config-internal.h" + +#define CONFIG_USERSPACE_PROBE_LOOKUP_METHOD_NAME_MAX_LEN 7 + +struct handler_filter_args { + const char* section; + config_entry_handler_cb handler; + void *user_data; +}; + +struct session_config_validation_ctx { + xmlSchemaParserCtxtPtr parser_ctx; + xmlSchemaPtr schema; + xmlSchemaValidCtxtPtr schema_validation_ctx; +}; + +const char * const config_element_all = "all"; +LTTNG_EXPORT const char *config_str_yes = "yes"; +LTTNG_EXPORT const char *config_str_true = "true"; +LTTNG_EXPORT const char *config_str_on = "on"; +LTTNG_EXPORT const char *config_str_no = "no"; +LTTNG_EXPORT const char *config_str_false = "false"; +LTTNG_EXPORT const char *config_str_off = "off"; +LTTNG_EXPORT const char *config_xml_encoding = "UTF-8"; +LTTNG_EXPORT size_t config_xml_encoding_bytes_per_char = 2; /* Size of the encoding's largest character */ +LTTNG_EXPORT const char *config_xml_indent_string = "\t"; +LTTNG_EXPORT const char *config_xml_true = "true"; +LTTNG_EXPORT const char *config_xml_false = "false"; + +const char * const config_element_channel = "channel"; +const char * const config_element_channels = "channels"; +const char * const config_element_domain = "domain"; +const char * const config_element_domains = "domains"; +const char * const config_element_event = "event"; +const char * const config_element_events = "events"; +const char * const config_element_context = "context"; +const char * const config_element_contexts = "contexts"; +const char * const config_element_attributes = "attributes"; +const char * const config_element_exclusion = "exclusion"; +const char * const config_element_exclusions = "exclusions"; +const char * const config_element_function_attributes = "function_attributes"; +const char * const config_element_probe_attributes = "probe_attributes"; +const char * const config_element_symbol_name = "symbol_name"; +const char * const config_element_address = "address"; +const char * const config_element_offset = "offset"; + +const char * const config_element_userspace_probe_lookup = "lookup_method"; +const char * const config_element_userspace_probe_lookup_function_default = "DEFAULT"; +const char * const config_element_userspace_probe_lookup_function_elf = "ELF"; +const char * const config_element_userspace_probe_lookup_tracepoint_sdt = "SDT"; +const char * const config_element_userspace_probe_location_binary_path = "binary_path"; +const char * const config_element_userspace_probe_function_attributes = "userspace_probe_function_attributes"; +const char * const config_element_userspace_probe_function_location_function_name = "function_name"; +const char * const config_element_userspace_probe_tracepoint_attributes = "userspace_probe_tracepoint_attributes"; +const char * const config_element_userspace_probe_tracepoint_location_provider_name = "provider_name"; +const char * const config_element_userspace_probe_tracepoint_location_probe_name = "probe_name"; + +const char * const config_element_name = "name"; +const char * const config_element_enabled = "enabled"; +const char * const config_element_overwrite_mode = "overwrite_mode"; +const char * const config_element_subbuf_size = "subbuffer_size"; +const char * const config_element_num_subbuf = "subbuffer_count"; +const char * const config_element_switch_timer_interval = "switch_timer_interval"; +const char * const config_element_read_timer_interval = "read_timer_interval"; +const char * const config_element_monitor_timer_interval = "monitor_timer_interval"; +const char * const config_element_blocking_timeout = "blocking_timeout"; +const char * const config_element_output = "output"; +const char * const config_element_output_type = "output_type"; +const char * const config_element_tracefile_size = "tracefile_size"; +const char * const config_element_tracefile_count = "tracefile_count"; +const char * const config_element_live_timer_interval = "live_timer_interval"; +const char * const config_element_discarded_events = "discarded_events"; +const char * const config_element_lost_packets = "lost_packets"; +const char * const config_element_type = "type"; +const char * const config_element_buffer_type = "buffer_type"; +const char * const config_element_session = "session"; +const char * const config_element_sessions = "sessions"; +const char * const config_element_context_perf = "perf"; +const char * const config_element_context_app = "app"; +const char * const config_element_context_app_provider_name = "provider_name"; +const char * const config_element_context_app_ctx_name = "ctx_name"; +const char * const config_element_config = "config"; +const char * const config_element_started = "started"; +const char * const config_element_snapshot_mode = "snapshot_mode"; +const char * const config_element_loglevel = "loglevel"; +const char * const config_element_loglevel_type = "loglevel_type"; +const char * const config_element_filter = "filter"; +const char * const config_element_filter_expression = "filter_expression"; +const char * const config_element_snapshot_outputs = "snapshot_outputs"; +const char * const config_element_consumer_output = "consumer_output"; +const char * const config_element_destination = "destination"; +const char * const config_element_path = "path"; +const char * const config_element_net_output = "net_output"; +const char * const config_element_control_uri = "control_uri"; +const char * const config_element_data_uri = "data_uri"; +const char * const config_element_max_size = "max_size"; +const char * const config_element_pid = "pid"; +const char * const config_element_pids = "pids"; +const char * const config_element_shared_memory_path = "shared_memory_path"; + +const char * const config_element_process_attr_id = "id"; +const char * const config_element_process_attr_tracker_pid = "pid_process_attr_tracker"; +const char * const config_element_process_attr_tracker_vpid = "vpid_process_attr_tracker"; +const char * const config_element_process_attr_tracker_uid = "uid_process_attr_tracker"; +const char * const config_element_process_attr_tracker_vuid = "vuid_process_attr_tracker"; +const char * const config_element_process_attr_tracker_gid = "gid_process_attr_tracker"; +const char * const config_element_process_attr_tracker_vgid = "vgid_process_attr_tracker"; +const char * const config_element_process_attr_trackers = "process_attr_trackers"; +const char * const config_element_process_attr_values = "process_attr_values"; +const char * const config_element_process_attr_value_type = "process_attr_value_type"; +const char * const config_element_process_attr_pid_value = "pid"; +const char * const config_element_process_attr_vpid_value = "vpid"; +const char * const config_element_process_attr_uid_value = "uid"; +const char * const config_element_process_attr_vuid_value = "vuid"; +const char * const config_element_process_attr_gid_value = "gid"; +const char * const config_element_process_attr_vgid_value = "vgid"; +const char * const config_element_process_attr_tracker_type = "process_attr_tracker_type"; + +/* Used for support of legacy tracker serialization (< 2.12). */ +const char * const config_element_trackers_legacy = "trackers"; +const char * const config_element_pid_tracker_legacy = "pid_tracker"; +const char * const config_element_tracker_targets_legacy = "targets"; +const char * const config_element_tracker_pid_legacy = "pid"; + +const char * const config_element_rotation_schedules = "rotation_schedules"; +const char * const config_element_rotation_schedule_periodic = "periodic"; +const char * const config_element_rotation_schedule_periodic_time_us = "time_us"; +const char * const config_element_rotation_schedule_size_threshold = "size_threshold"; +const char * const config_element_rotation_schedule_size_threshold_bytes = "bytes"; + +const char * const config_domain_type_kernel = "KERNEL"; +const char * const config_domain_type_ust = "UST"; +const char * const config_domain_type_jul = "JUL"; +const char * const config_domain_type_log4j = "LOG4J"; +const char * const config_domain_type_python = "PYTHON"; + +const char * const config_buffer_type_per_pid = "PER_PID"; +const char * const config_buffer_type_per_uid = "PER_UID"; +const char * const config_buffer_type_global = "GLOBAL"; + +const char * const config_overwrite_mode_discard = "DISCARD"; +const char * const config_overwrite_mode_overwrite = "OVERWRITE"; + +const char * const config_output_type_splice = "SPLICE"; +const char * const config_output_type_mmap = "MMAP"; + +const char * const config_loglevel_type_all = "ALL"; +const char * const config_loglevel_type_range = "RANGE"; +const char * const config_loglevel_type_single = "SINGLE"; + +const char * const config_event_type_all = "ALL"; +const char * const config_event_type_tracepoint = "TRACEPOINT"; +const char * const config_event_type_probe = "PROBE"; +const char * const config_event_type_userspace_probe = "USERSPACE_PROBE"; +const char * const config_event_type_function = "FUNCTION"; +const char * const config_event_type_function_entry = "FUNCTION_ENTRY"; +const char * const config_event_type_noop = "NOOP"; +const char * const config_event_type_syscall = "SYSCALL"; +const char * const config_event_type_kprobe = "KPROBE"; +const char * const config_event_type_kretprobe = "KRETPROBE"; + +const char * const config_event_context_pid = "PID"; +const char * const config_event_context_procname = "PROCNAME"; +const char * const config_event_context_prio = "PRIO"; +const char * const config_event_context_nice = "NICE"; +const char * const config_event_context_vpid = "VPID"; +const char * const config_event_context_tid = "TID"; +const char * const config_event_context_vtid = "VTID"; +const char * const config_event_context_ppid = "PPID"; +const char * const config_event_context_vppid = "VPPID"; +const char * const config_event_context_pthread_id = "PTHREAD_ID"; +const char * const config_event_context_hostname = "HOSTNAME"; +const char * const config_event_context_ip = "IP"; +const char * const config_event_context_perf_thread_counter = "PERF_THREAD_COUNTER"; +const char * const config_event_context_app = "APP"; +const char * const config_event_context_interruptible = "INTERRUPTIBLE"; +const char * const config_event_context_preemptible = "PREEMPTIBLE"; +const char * const config_event_context_need_reschedule = "NEED_RESCHEDULE"; +const char * const config_event_context_migratable = "MIGRATABLE"; +const char * const config_event_context_callstack_user= "CALLSTACK_USER"; +const char * const config_event_context_callstack_kernel = "CALLSTACK_KERNEL"; +const char * const config_event_context_cgroup_ns = "CGROUP_NS"; +const char * const config_event_context_ipc_ns = "IPC_NS"; +const char * const config_event_context_mnt_ns = "MNT_NS"; +const char * const config_event_context_net_ns = "NET_NS"; +const char * const config_event_context_pid_ns = "PID_NS"; +const char * const config_event_context_time_ns = "TIME_NS"; +const char * const config_event_context_user_ns = "USER_NS"; +const char * const config_event_context_uts_ns = "UTS_NS"; +const char * const config_event_context_uid = "UID"; +const char * const config_event_context_euid = "EUID"; +const char * const config_event_context_suid = "SUID"; +const char * const config_event_context_gid = "GID"; +const char * const config_event_context_egid = "EGID"; +const char * const config_event_context_sgid = "SGID"; +const char * const config_event_context_vuid = "VUID"; +const char * const config_event_context_veuid = "VEUID"; +const char * const config_event_context_vsuid = "VSUID"; +const char * const config_event_context_vgid = "VGID"; +const char * const config_event_context_vegid = "VEGID"; +const char * const config_event_context_vsgid = "VSGID"; + +/* Deprecated symbols */ +LTTNG_EXPORT const char *config_element_perf; + +enum process_event_node_phase { + CREATION = 0, + ENABLE = 1, +}; + +struct consumer_output { + int enabled; + char *path; + char *control_uri; + char *data_uri; +}; + +static int config_entry_handler_filter(struct handler_filter_args *args, + const char *section, const char *name, const char *value) +{ + int ret = 0; + struct config_entry entry = { section, name, value }; + + LTTNG_ASSERT(args); + + if (!section || !name || !value) { + ret = -EIO; + goto end; + } + + if (args->section) { + if (strcmp(args->section, section)) { + goto end; + } + } + + ret = args->handler(&entry, args->user_data); +end: + return ret; +} + +int config_get_section_entries(const char *override_path, const char *section, + config_entry_handler_cb handler, void *user_data) +{ + int ret = 0; + const char *path; + FILE *config_file = NULL; + struct handler_filter_args filter = { section, handler, user_data }; + + /* First, try system-wide conf. file. */ + path = DEFAULT_DAEMON_SYSTEM_CONFIGPATH; + + config_file = fopen(path, "r"); + if (config_file) { + DBG("Loading daemon conf file at %s", path); + /* + * Return value is not very important here since error or not, we + * continue and try the next possible conf. file. + */ + (void) ini_parse_file(config_file, + (ini_entry_handler) config_entry_handler_filter, + (void *) &filter); + fclose(config_file); + } + + /* Second is the user local configuration. */ + path = utils_get_home_dir(); + if (path) { + char fullpath[PATH_MAX]; + + ret = snprintf(fullpath, sizeof(fullpath), + DEFAULT_DAEMON_HOME_CONFIGPATH, path); + if (ret < 0) { + PERROR("snprintf user conf. path"); + goto error; + } + + config_file = fopen(fullpath, "r"); + if (config_file) { + DBG("Loading daemon user conf file at %s", path); + /* + * Return value is not very important here since error or not, we + * continue and try the next possible conf. file. + */ + (void) ini_parse_file(config_file, + (ini_entry_handler) config_entry_handler_filter, + (void *) &filter); + fclose(config_file); + } + } + + /* Final path is the one that the user might have provided. */ + if (override_path) { + config_file = fopen(override_path, "r"); + if (config_file) { + DBG("Loading daemon command line conf file at %s", override_path); + (void) ini_parse_file(config_file, + (ini_entry_handler) config_entry_handler_filter, + (void *) &filter); + fclose(config_file); + } else { + ERR("Failed to open daemon configuration file at %s", + override_path); + ret = -ENOENT; + goto error; + } + } + + /* Everything went well. */ + ret = 0; + +error: + return ret; +} + +int config_parse_value(const char *value) +{ + int i, ret = 0; + char *endptr, *lower_str; + size_t len; + unsigned long v; + + len = strlen(value); + if (!len) { + ret = -1; + goto end; + } + + v = strtoul(value, &endptr, 10); + if (endptr != value) { + ret = v; + goto end; + } + + lower_str = (char *) zmalloc(len + 1); + if (!lower_str) { + PERROR("zmalloc"); + ret = -errno; + goto end; + } + + for (i = 0; i < len; i++) { + lower_str[i] = tolower(value[i]); + } + + if (!strcmp(lower_str, config_str_yes) || + !strcmp(lower_str, config_str_true) || + !strcmp(lower_str, config_str_on)) { + ret = 1; + } else if (!strcmp(lower_str, config_str_no) || + !strcmp(lower_str, config_str_false) || + !strcmp(lower_str, config_str_off)) { + ret = 0; + } else { + ret = -1; + } + + free(lower_str); +end: + return ret; +} + +/* + * Returns a xmlChar string which must be released using xmlFree(). + */ +static xmlChar *encode_string(const char *in_str) +{ + xmlChar *out_str = NULL; + xmlCharEncodingHandlerPtr handler; + int out_len, ret, in_len; + + LTTNG_ASSERT(in_str); + + handler = xmlFindCharEncodingHandler(config_xml_encoding); + if (!handler) { + ERR("xmlFindCharEncodingHandler return NULL!. Configure issue!"); + goto end; + } + + in_len = strlen(in_str); + /* + * Add 1 byte for the NULL terminted character. The factor 4 here is + * used because UTF-8 characters can take up to 4 bytes. + */ + out_len = (in_len * 4) + 1; + out_str = (xmlChar *) xmlMalloc(out_len); + if (!out_str) { + goto end; + } + + ret = handler->input(out_str, &out_len, (const xmlChar *) in_str, &in_len); + if (ret < 0) { + xmlFree(out_str); + out_str = NULL; + goto end; + } + + /* out_len is now the size of out_str */ + out_str[out_len] = '\0'; +end: + return out_str; +} + +struct config_writer *config_writer_create(int fd_output, int indent) +{ + int ret; + struct config_writer *writer; + xmlOutputBufferPtr buffer; + + writer = (config_writer *) zmalloc(sizeof(struct config_writer)); + if (!writer) { + PERROR("zmalloc config_writer_create"); + goto end; + } + + buffer = xmlOutputBufferCreateFd(fd_output, NULL); + if (!buffer) { + goto error_destroy; + } + + writer->writer = xmlNewTextWriter(buffer); + ret = xmlTextWriterStartDocument(writer->writer, NULL, + config_xml_encoding, NULL); + if (ret < 0) { + goto error_destroy; + } + + ret = xmlTextWriterSetIndentString(writer->writer, + BAD_CAST config_xml_indent_string); + if (ret) { + goto error_destroy; + } + + ret = xmlTextWriterSetIndent(writer->writer, indent); + if (ret) { + goto error_destroy; + } + +end: + return writer; +error_destroy: + config_writer_destroy(writer); + return NULL; +} + +int config_writer_destroy(struct config_writer *writer) +{ + int ret = 0; + + if (!writer) { + ret = -EINVAL; + goto end; + } + + if (xmlTextWriterEndDocument(writer->writer) < 0) { + WARN("Could not close XML document"); + ret = -EIO; + } + + if (writer->writer) { + xmlFreeTextWriter(writer->writer); + } + + free(writer); +end: + return ret; +} + +int config_writer_open_element(struct config_writer *writer, + const char *element_name) +{ + int ret; + xmlChar *encoded_element_name; + + if (!writer || !writer->writer || !element_name || !element_name[0]) { + ret = -1; + goto end; + } + + encoded_element_name = encode_string(element_name); + if (!encoded_element_name) { + ret = -1; + goto end; + } + + ret = xmlTextWriterStartElement(writer->writer, encoded_element_name); + xmlFree(encoded_element_name); +end: + return ret >= 0 ? 0 : ret; +} + +int config_writer_write_attribute(struct config_writer *writer, + const char *name, const char *value) +{ + int ret; + xmlChar *encoded_name = NULL; + xmlChar *encoded_value = NULL; + + if (!writer || !writer->writer || !name || !name[0]) { + ret = -1; + goto end; + } + + encoded_name = encode_string(name); + if (!encoded_name) { + ret = -1; + goto end; + } + + encoded_value = encode_string(value); + if (!encoded_value) { + ret = -1; + goto end; + } + + ret = xmlTextWriterWriteAttribute(writer->writer, encoded_name, + encoded_value); +end: + xmlFree(encoded_name); + xmlFree(encoded_value); + return ret >= 0 ? 0 : ret; +} + +int config_writer_close_element(struct config_writer *writer) +{ + int ret; + + if (!writer || !writer->writer) { + ret = -1; + goto end; + } + + ret = xmlTextWriterEndElement(writer->writer); +end: + return ret >= 0 ? 0 : ret; +} + +int config_writer_write_element_unsigned_int(struct config_writer *writer, + const char *element_name, uint64_t value) +{ + int ret; + xmlChar *encoded_element_name; + + if (!writer || !writer->writer || !element_name || !element_name[0]) { + ret = -1; + goto end; + } + + encoded_element_name = encode_string(element_name); + if (!encoded_element_name) { + ret = -1; + goto end; + } + + ret = xmlTextWriterWriteFormatElement(writer->writer, + encoded_element_name, "%" PRIu64, value); + xmlFree(encoded_element_name); +end: + return ret >= 0 ? 0 : ret; +} + +int config_writer_write_element_signed_int(struct config_writer *writer, + const char *element_name, int64_t value) +{ + int ret; + xmlChar *encoded_element_name; + + if (!writer || !writer->writer || !element_name || !element_name[0]) { + ret = -1; + goto end; + } + + encoded_element_name = encode_string(element_name); + if (!encoded_element_name) { + ret = -1; + goto end; + } + + ret = xmlTextWriterWriteFormatElement(writer->writer, + encoded_element_name, "%" PRIi64, value); + xmlFree(encoded_element_name); +end: + return ret >= 0 ? 0 : ret; +} + +int config_writer_write_element_bool(struct config_writer *writer, + const char *element_name, int value) +{ + return config_writer_write_element_string(writer, element_name, + value ? config_xml_true : config_xml_false); +} + +int config_writer_write_element_double(struct config_writer *writer, + const char *element_name, + double value) +{ + int ret; + xmlChar *encoded_element_name; + + if (!writer || !writer->writer || !element_name || !element_name[0]) { + ret = -1; + goto end; + } + + encoded_element_name = encode_string(element_name); + if (!encoded_element_name) { + ret = -1; + goto end; + } + + ret = xmlTextWriterWriteFormatElement( + writer->writer, encoded_element_name, "%f", value); + xmlFree(encoded_element_name); +end: + return ret >= 0 ? 0 : ret; +} + +int config_writer_write_element_string(struct config_writer *writer, + const char *element_name, const char *value) +{ + int ret; + xmlChar *encoded_element_name = NULL; + xmlChar *encoded_value = NULL; + + if (!writer || !writer->writer || !element_name || !element_name[0] || + !value) { + ret = -1; + goto end; + } + + encoded_element_name = encode_string(element_name); + if (!encoded_element_name) { + ret = -1; + goto end; + } + + encoded_value = encode_string(value); + if (!encoded_value) { + ret = -1; + goto end; + } + + ret = xmlTextWriterWriteElement(writer->writer, encoded_element_name, + encoded_value); +end: + xmlFree(encoded_element_name); + xmlFree(encoded_value); + return ret >= 0 ? 0 : ret; +} + +static +void xml_error_handler(void *ctx, const char *format, ...) +{ + char *errMsg; + va_list args; + int ret; + + va_start(args, format); + ret = vasprintf(&errMsg, format, args); + va_end(args); + if (ret == -1) { + ERR("String allocation failed in xml error handler"); + return; + } + + fprintf(stderr, "XML Error: %s", errMsg); + free(errMsg); +} + +static +void fini_session_config_validation_ctx( + struct session_config_validation_ctx *ctx) +{ + if (ctx->parser_ctx) { + xmlSchemaFreeParserCtxt(ctx->parser_ctx); + } + + if (ctx->schema) { + xmlSchemaFree(ctx->schema); + } + + if (ctx->schema_validation_ctx) { + xmlSchemaFreeValidCtxt(ctx->schema_validation_ctx); + } + + memset(ctx, 0, sizeof(struct session_config_validation_ctx)); +} + +static +char *get_session_config_xsd_path(void) +{ + char *xsd_path; + const char *base_path = lttng_secure_getenv(DEFAULT_SESSION_CONFIG_XSD_PATH_ENV); + size_t base_path_len; + size_t max_path_len; + + if (!base_path) { + base_path = DEFAULT_SESSION_CONFIG_XSD_PATH; + } + + base_path_len = strlen(base_path); + max_path_len = base_path_len + + sizeof(DEFAULT_SESSION_CONFIG_XSD_FILENAME) + 1; + xsd_path = (char *) zmalloc(max_path_len); + if (!xsd_path) { + goto end; + } + + strcpy(xsd_path, base_path); + if (xsd_path[base_path_len - 1] != '/') { + xsd_path[base_path_len++] = '/'; + } + + strcpy(xsd_path + base_path_len, DEFAULT_SESSION_CONFIG_XSD_FILENAME); +end: + return xsd_path; +} + +static +int init_session_config_validation_ctx( + struct session_config_validation_ctx *ctx) +{ + int ret; + char *xsd_path = get_session_config_xsd_path(); + + if (!xsd_path) { + ret = -LTTNG_ERR_NOMEM; + goto end; + } + + ctx->parser_ctx = xmlSchemaNewParserCtxt(xsd_path); + if (!ctx->parser_ctx) { + ERR("XSD parser context creation failed"); + ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; + goto end; + } + xmlSchemaSetParserErrors(ctx->parser_ctx, xml_error_handler, + xml_error_handler, NULL); + + ctx->schema = xmlSchemaParse(ctx->parser_ctx); + if (!ctx->schema) { + ERR("XSD parsing failed"); + ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; + goto end; + } + + ctx->schema_validation_ctx = xmlSchemaNewValidCtxt(ctx->schema); + if (!ctx->schema_validation_ctx) { + ERR("XSD validation context creation failed"); + ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; + goto end; + } + + xmlSchemaSetValidErrors(ctx->schema_validation_ctx, xml_error_handler, + xml_error_handler, NULL); + ret = 0; + +end: + if (ret) { + fini_session_config_validation_ctx(ctx); + } + + free(xsd_path); + return ret; +} + +static +int parse_uint(xmlChar *str, uint64_t *val) +{ + int ret; + char *endptr; + + if (!str || !val) { + ret = -1; + goto end; + } + + *val = strtoull((const char *) str, &endptr, 10); + if (!endptr || *endptr) { + ret = -1; + } else { + ret = 0; + } + +end: + return ret; +} + +static +int parse_int(xmlChar *str, int64_t *val) +{ + int ret; + char *endptr; + + if (!str || !val) { + ret = -1; + goto end; + } + + *val = strtoll((const char *) str, &endptr, 10); + if (!endptr || *endptr) { + ret = -1; + } else { + ret = 0; + } + +end: + return ret; +} + +static +int parse_bool(xmlChar *str, int *val) +{ + int ret = 0; + + if (!str || !val) { + ret = -1; + goto end; + } + + if (!strcmp((const char *) str, config_xml_true) || + !strcmp((const char *) str, "1")) { + *val = 1; + } else if (!strcmp((const char *) str, config_xml_false) || + !strcmp((const char *) str, "0")) { + *val = 0; + } else { + WARN("Invalid boolean value encountered (%s).", + (const char *) str); + ret = -1; + } +end: + return ret; +} + +static +int get_domain_type(xmlChar *domain) +{ + int ret; + + if (!domain) { + goto error; + } + + if (!strcmp((char *) domain, config_domain_type_kernel)) { + ret = LTTNG_DOMAIN_KERNEL; + } else if (!strcmp((char *) domain, config_domain_type_ust)) { + ret = LTTNG_DOMAIN_UST; + } else if (!strcmp((char *) domain, config_domain_type_jul)) { + ret = LTTNG_DOMAIN_JUL; + } else if (!strcmp((char *) domain, config_domain_type_log4j)) { + ret = LTTNG_DOMAIN_LOG4J; + } else if (!strcmp((char *) domain, config_domain_type_python)) { + ret = LTTNG_DOMAIN_PYTHON; + } else { + goto error; + } + + return ret; +error: + return -1; +} + +static +int get_buffer_type(xmlChar *buffer_type) +{ + int ret; + + if (!buffer_type) { + goto error; + } + + if (!strcmp((char *) buffer_type, config_buffer_type_global)) { + ret = LTTNG_BUFFER_GLOBAL; + } else if (!strcmp((char *) buffer_type, config_buffer_type_per_uid)) { + ret = LTTNG_BUFFER_PER_UID; + } else if (!strcmp((char *) buffer_type, config_buffer_type_per_pid)) { + ret = LTTNG_BUFFER_PER_PID; + } else { + goto error; + } + + return ret; +error: + return -1; +} + +static +int get_overwrite_mode(xmlChar *overwrite_mode) +{ + int ret; + + if (!overwrite_mode) { + goto error; + } + + if (!strcmp((char *) overwrite_mode, config_overwrite_mode_overwrite)) { + ret = 1; + } else if (!strcmp((char *) overwrite_mode, + config_overwrite_mode_discard)) { + ret = 0; + } else { + goto error; + } + + return ret; +error: + return -1; +} + +static +int get_output_type(xmlChar *output_type) +{ + int ret; + + if (!output_type) { + goto error; + } + + if (!strcmp((char *) output_type, config_output_type_mmap)) { + ret = LTTNG_EVENT_MMAP; + } else if (!strcmp((char *) output_type, config_output_type_splice)) { + ret = LTTNG_EVENT_SPLICE; + } else { + goto error; + } + + return ret; +error: + return -1; +} + +static +int get_event_type(xmlChar *event_type) +{ + int ret; + + if (!event_type) { + goto error; + } + + if (!strcmp((char *) event_type, config_event_type_all)) { + ret = LTTNG_EVENT_ALL; + } else if (!strcmp((char *) event_type, config_event_type_tracepoint)) { + ret = LTTNG_EVENT_TRACEPOINT; + } else if (!strcmp((char *) event_type, config_event_type_probe)) { + ret = LTTNG_EVENT_PROBE; + } else if (!strcmp((char *) event_type, + config_event_type_userspace_probe)) { + ret = LTTNG_EVENT_USERSPACE_PROBE; + } else if (!strcmp((char *) event_type, config_event_type_function)) { + ret = LTTNG_EVENT_FUNCTION; + } else if (!strcmp((char *) event_type, + config_event_type_function_entry)) { + ret = LTTNG_EVENT_FUNCTION_ENTRY; + } else if (!strcmp((char *) event_type, config_event_type_noop)) { + ret = LTTNG_EVENT_NOOP; + } else if (!strcmp((char *) event_type, config_event_type_syscall)) { + ret = LTTNG_EVENT_SYSCALL; + } else { + goto error; + } + + return ret; +error: + return -1; +} + +static +int get_loglevel_type(xmlChar *loglevel_type) +{ + int ret; + + if (!loglevel_type) { + goto error; + } + + if (!strcmp((char *) loglevel_type, config_loglevel_type_all)) { + ret = LTTNG_EVENT_LOGLEVEL_ALL; + } else if (!strcmp((char *) loglevel_type, + config_loglevel_type_range)) { + ret = LTTNG_EVENT_LOGLEVEL_RANGE; + } else if (!strcmp((char *) loglevel_type, + config_loglevel_type_single)) { + ret = LTTNG_EVENT_LOGLEVEL_SINGLE; + } else { + goto error; + } + + return ret; +error: + return -1; +} + +/* + * Return the context type or -1 on error. + */ +static +int get_context_type(xmlChar *context_type) +{ + int ret; + + if (!context_type) { + goto error; + } + + if (!strcmp((char *) context_type, config_event_context_pid)) { + ret = LTTNG_EVENT_CONTEXT_PID; + } else if (!strcmp((char *) context_type, + config_event_context_procname)) { + ret = LTTNG_EVENT_CONTEXT_PROCNAME; + } else if (!strcmp((char *) context_type, + config_event_context_prio)) { + ret = LTTNG_EVENT_CONTEXT_PRIO; + } else if (!strcmp((char *) context_type, + config_event_context_nice)) { + ret = LTTNG_EVENT_CONTEXT_NICE; + } else if (!strcmp((char *) context_type, + config_event_context_vpid)) { + ret = LTTNG_EVENT_CONTEXT_VPID; + } else if (!strcmp((char *) context_type, + config_event_context_tid)) { + ret = LTTNG_EVENT_CONTEXT_TID; + } else if (!strcmp((char *) context_type, + config_event_context_vtid)) { + ret = LTTNG_EVENT_CONTEXT_VTID; + } else if (!strcmp((char *) context_type, + config_event_context_ppid)) { + ret = LTTNG_EVENT_CONTEXT_PPID; + } else if (!strcmp((char *) context_type, + config_event_context_vppid)) { + ret = LTTNG_EVENT_CONTEXT_VPPID; + } else if (!strcmp((char *) context_type, + config_event_context_pthread_id)) { + ret = LTTNG_EVENT_CONTEXT_PTHREAD_ID; + } else if (!strcmp((char *) context_type, + config_event_context_hostname)) { + ret = LTTNG_EVENT_CONTEXT_HOSTNAME; + } else if (!strcmp((char *) context_type, + config_event_context_ip)) { + ret = LTTNG_EVENT_CONTEXT_IP; + } else if (!strcmp((char *) context_type, + config_event_context_interruptible)) { + ret = LTTNG_EVENT_CONTEXT_INTERRUPTIBLE; + } else if (!strcmp((char *) context_type, + config_event_context_preemptible)) { + ret = LTTNG_EVENT_CONTEXT_PREEMPTIBLE; + } else if (!strcmp((char *) context_type, + config_event_context_need_reschedule)) { + ret = LTTNG_EVENT_CONTEXT_NEED_RESCHEDULE; + } else if (!strcmp((char *) context_type, + config_event_context_migratable)) { + ret = LTTNG_EVENT_CONTEXT_MIGRATABLE; + } else if (!strcmp((char *) context_type, + config_event_context_callstack_user)) { + ret = LTTNG_EVENT_CONTEXT_CALLSTACK_USER; + } else if (!strcmp((char *) context_type, + config_event_context_callstack_kernel)) { + ret = LTTNG_EVENT_CONTEXT_CALLSTACK_KERNEL; + } else if (!strcmp((char *) context_type, + config_event_context_cgroup_ns)) { + ret = LTTNG_EVENT_CONTEXT_CGROUP_NS; + } else if (!strcmp((char *) context_type, + config_event_context_ipc_ns)) { + ret = LTTNG_EVENT_CONTEXT_IPC_NS; + } else if (!strcmp((char *) context_type, + config_event_context_mnt_ns)) { + ret = LTTNG_EVENT_CONTEXT_MNT_NS; + } else if (!strcmp((char *) context_type, + config_event_context_net_ns)) { + ret = LTTNG_EVENT_CONTEXT_NET_NS; + } else if (!strcmp((char *) context_type, + config_event_context_pid_ns)) { + ret = LTTNG_EVENT_CONTEXT_PID_NS; + } else if (!strcmp((char *) context_type, + config_event_context_time_ns)) { + ret = LTTNG_EVENT_CONTEXT_TIME_NS; + } else if (!strcmp((char *) context_type, + config_event_context_user_ns)) { + ret = LTTNG_EVENT_CONTEXT_USER_NS; + } else if (!strcmp((char *) context_type, + config_event_context_uts_ns)) { + ret = LTTNG_EVENT_CONTEXT_UTS_NS; + } else if (!strcmp((char *) context_type, + config_event_context_uid)) { + ret = LTTNG_EVENT_CONTEXT_UID; + } else if (!strcmp((char *) context_type, + config_event_context_euid)) { + ret = LTTNG_EVENT_CONTEXT_EUID; + } else if (!strcmp((char *) context_type, + config_event_context_suid)) { + ret = LTTNG_EVENT_CONTEXT_SUID; + } else if (!strcmp((char *) context_type, + config_event_context_gid)) { + ret = LTTNG_EVENT_CONTEXT_GID; + } else if (!strcmp((char *) context_type, + config_event_context_egid)) { + ret = LTTNG_EVENT_CONTEXT_EGID; + } else if (!strcmp((char *) context_type, + config_event_context_sgid)) { + ret = LTTNG_EVENT_CONTEXT_SGID; + } else if (!strcmp((char *) context_type, + config_event_context_vuid)) { + ret = LTTNG_EVENT_CONTEXT_VUID; + } else if (!strcmp((char *) context_type, + config_event_context_veuid)) { + ret = LTTNG_EVENT_CONTEXT_VEUID; + } else if (!strcmp((char *) context_type, + config_event_context_vsuid)) { + ret = LTTNG_EVENT_CONTEXT_VSUID; + } else if (!strcmp((char *) context_type, + config_event_context_vgid)) { + ret = LTTNG_EVENT_CONTEXT_VGID; + } else if (!strcmp((char *) context_type, + config_event_context_vegid)) { + ret = LTTNG_EVENT_CONTEXT_VEGID; + } else if (!strcmp((char *) context_type, + config_event_context_vsgid)) { + ret = LTTNG_EVENT_CONTEXT_VSGID; + } else { + goto error; + } + + return ret; +error: + return -1; +} + +static +int init_domain(xmlNodePtr domain_node, struct lttng_domain *domain) +{ + int ret; + xmlNodePtr node; + + for (node = xmlFirstElementChild(domain_node); node; + node = xmlNextElementSibling(node)) { + if (!strcmp((const char *) node->name, config_element_type)) { + /* domain type */ + xmlChar *node_content = xmlNodeGetContent(node); + if (!node_content) { + ret = -LTTNG_ERR_NOMEM; + goto end; + } + + ret = get_domain_type(node_content); + free(node_content); + if (ret < 0) { + ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; + goto end; + } + + domain->type = (lttng_domain_type) ret; + } else if (!strcmp((const char *) node->name, + config_element_buffer_type)) { + /* buffer type */ + xmlChar *node_content = xmlNodeGetContent(node); + if (!node_content) { + ret = -LTTNG_ERR_NOMEM; + goto end; + } + + ret = get_buffer_type(node_content); + free(node_content); + if (ret < 0) { + ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; + goto end; + } + + domain->buf_type = (lttng_buffer_type) ret; + } + } + ret = 0; +end: + return ret; +} + +static +int get_net_output_uris(xmlNodePtr net_output_node, char **control_uri, + char **data_uri) +{ + xmlNodePtr node; + + for (node = xmlFirstElementChild(net_output_node); node; + node = xmlNextElementSibling(node)) { + if (!strcmp((const char *) node->name, config_element_control_uri)) { + /* control_uri */ + *control_uri = (char *) xmlNodeGetContent(node); + if (!*control_uri) { + break; + } + } else { + /* data_uri */ + *data_uri = (char *) xmlNodeGetContent(node); + if (!*data_uri) { + break; + } + } + } + + return *control_uri || *data_uri ? 0 : -LTTNG_ERR_LOAD_INVALID_CONFIG; +} + +static +int process_consumer_output(xmlNodePtr consumer_output_node, + struct consumer_output *output) +{ + int ret; + xmlNodePtr node; + + LTTNG_ASSERT(output); + + for (node = xmlFirstElementChild(consumer_output_node); node; + node = xmlNextElementSibling(node)) { + if (!strcmp((const char *) node->name, config_element_enabled)) { + xmlChar *enabled_str = xmlNodeGetContent(node); + + /* enabled */ + if (!enabled_str) { + ret = -LTTNG_ERR_NOMEM; + goto end; + } + + ret = parse_bool(enabled_str, &output->enabled); + free(enabled_str); + if (ret) { + goto end; + } + } else { + xmlNodePtr output_type_node; + + /* destination */ + output_type_node = xmlFirstElementChild(node); + if (!output_type_node) { + ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; + goto end; + } + + if (!strcmp((const char *) output_type_node->name, + config_element_path)) { + /* path */ + output->path = (char *) xmlNodeGetContent(output_type_node); + if (!output->path) { + ret = -LTTNG_ERR_NOMEM; + goto end; + } + } else { + /* net_output */ + ret = get_net_output_uris(output_type_node, + &output->control_uri, &output->data_uri); + if (ret) { + goto end; + } + } + } + } + ret = 0; + +end: + if (ret) { + free(output->path); + free(output->control_uri); + free(output->data_uri); + memset(output, 0, sizeof(struct consumer_output)); + } + return ret; +} + +static +int create_session_net_output(const char *name, const char *control_uri, + const char *data_uri) +{ + int ret; + struct lttng_handle *handle; + const char *uri = NULL; + + LTTNG_ASSERT(name); + + handle = lttng_create_handle(name, NULL); + if (!handle) { + ret = -LTTNG_ERR_NOMEM; + goto end; + } + + if (!control_uri || !data_uri) { + uri = control_uri ? control_uri : data_uri; + control_uri = uri; + data_uri = uri; + } + + ret = lttng_set_consumer_url(handle, control_uri, data_uri); + lttng_destroy_handle(handle); +end: + return ret; +} + +static +int create_snapshot_session(const char *session_name, xmlNodePtr output_node, + const struct config_load_session_override_attr *overrides) +{ + int ret; + xmlNodePtr node = NULL; + xmlNodePtr snapshot_output_list_node; + xmlNodePtr snapshot_output_node; + + LTTNG_ASSERT(session_name); + + ret = lttng_create_session_snapshot(session_name, NULL); + if (ret) { + goto end; + } + + if (!output_node) { + goto end; + } + + snapshot_output_list_node = xmlFirstElementChild(output_node); + + /* Parse and create snapshot outputs */ + + for (snapshot_output_node = + xmlFirstElementChild(snapshot_output_list_node); + snapshot_output_node; snapshot_output_node = + xmlNextElementSibling(snapshot_output_node)) { + char *name = NULL; + uint64_t max_size = UINT64_MAX; + struct consumer_output output = { 0 }; + struct lttng_snapshot_output *snapshot_output = NULL; + const char *control_uri = NULL; + const char *data_uri = NULL; + const char *path = NULL; + + for (node = xmlFirstElementChild(snapshot_output_node); node; + node = xmlNextElementSibling(node)) { + if (!strcmp((const char *) node->name, + config_element_name)) { + /* name */ + name = (char *) xmlNodeGetContent(node); + if (!name) { + ret = -LTTNG_ERR_NOMEM; + goto error_snapshot_output; + } + } else if (!strcmp((const char *) node->name, + config_element_max_size)) { + xmlChar *content = xmlNodeGetContent(node); + + /* max_size */ + if (!content) { + ret = -LTTNG_ERR_NOMEM; + goto error_snapshot_output; + } + ret = parse_uint(content, &max_size); + free(content); + if (ret) { + ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; + goto error_snapshot_output; + } + } else { + /* consumer_output */ + ret = process_consumer_output(node, &output); + if (ret) { + goto error_snapshot_output; + } + } + } + + control_uri = output.control_uri; + data_uri = output.data_uri; + path = output.path; + + if (overrides) { + if (overrides->path_url) { + path = overrides->path_url; + /* Control/data_uri are null */ + control_uri = NULL; + data_uri = NULL; + } else { + if (overrides->ctrl_url) { + control_uri = overrides->ctrl_url; + /* path is null */ + path = NULL; + } + if (overrides->data_url) { + data_uri = overrides->data_url; + /* path is null */ + path = NULL; + } + } + } + + snapshot_output = lttng_snapshot_output_create(); + if (!snapshot_output) { + ret = -LTTNG_ERR_NOMEM; + goto error_snapshot_output; + } + + ret = lttng_snapshot_output_set_name(name, snapshot_output); + if (ret) { + goto error_snapshot_output; + } + + ret = lttng_snapshot_output_set_size(max_size, snapshot_output); + if (ret) { + goto error_snapshot_output; + } + + if (path) { + ret = lttng_snapshot_output_set_ctrl_url(path, + snapshot_output); + if (ret) { + goto error_snapshot_output; + } + } else { + if (control_uri) { + ret = lttng_snapshot_output_set_ctrl_url(control_uri, + snapshot_output); + if (ret) { + goto error_snapshot_output; + } + } + + if (data_uri) { + ret = lttng_snapshot_output_set_data_url(data_uri, + snapshot_output); + if (ret) { + goto error_snapshot_output; + } + } + } + + ret = lttng_snapshot_add_output(session_name, snapshot_output); +error_snapshot_output: + free(name); + free(output.path); + free(output.control_uri); + free(output.data_uri); + lttng_snapshot_output_destroy(snapshot_output); + if (ret) { + goto end; + } + } +end: + return ret; +} + +static +int create_session(const char *name, + xmlNodePtr output_node, + uint64_t live_timer_interval, + const struct config_load_session_override_attr *overrides) +{ + int ret; + struct consumer_output output = { 0 }; + xmlNodePtr consumer_output_node; + const char *control_uri = NULL; + const char *data_uri = NULL; + const char *path = NULL; + + LTTNG_ASSERT(name); + + if (output_node) { + consumer_output_node = xmlFirstElementChild(output_node); + if (!consumer_output_node) { + ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; + goto end; + } + + if (strcmp((const char *) consumer_output_node->name, + config_element_consumer_output)) { + WARN("Invalid output type, expected %s node", + config_element_consumer_output); + ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; + goto end; + } + + ret = process_consumer_output(consumer_output_node, &output); + if (ret) { + goto end; + } + } + + control_uri = output.control_uri; + data_uri = output.data_uri; + path = output.path; + + /* Check for override and apply them */ + if (overrides) { + if (overrides->path_url) { + path = overrides->path_url; + /* control/data_uri are null */; + control_uri = NULL; + data_uri = NULL; + } else { + if (overrides->ctrl_url) { + control_uri = overrides->ctrl_url; + /* path is null */ + path = NULL; + } + if (overrides->data_url) { + data_uri = overrides->data_url; + /* path is null */ + path = NULL; + } + } + } + + + if (live_timer_interval != UINT64_MAX && !control_uri && !data_uri) { + ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; + goto end; + } + + if (control_uri || data_uri) { + /* network destination */ + if (live_timer_interval && live_timer_interval != UINT64_MAX) { + /* + * URLs are provided for sure since the test above make sure that + * with a live timer the data and control URIs are provided. So, + * NULL is passed here and will be set right after. + */ + ret = lttng_create_session_live(name, NULL, live_timer_interval); + } else { + ret = lttng_create_session(name, NULL); + } + if (ret) { + goto end; + } + + ret = create_session_net_output(name, control_uri, data_uri); + if (ret) { + goto end; + } + + } else { + /* either local output or no output */ + ret = lttng_create_session(name, path); + if (ret) { + goto end; + } + } +end: + free(output.path); + free(output.control_uri); + free(output.data_uri); + return ret; +} + +static +struct lttng_userspace_probe_location * +process_userspace_probe_function_attribute_node( + xmlNodePtr attribute_node) +{ + xmlNodePtr function_attribute_node; + char *function_name = NULL, *binary_path = NULL; + struct lttng_userspace_probe_location *location = NULL; + struct lttng_userspace_probe_location_lookup_method *lookup_method = NULL; + + /* + * Process userspace probe location function attributes. The order of + * the fields are not guaranteed so we need to iterate over all fields + * and check at the end if everything we need for this location type is + * there. + */ + for (function_attribute_node = + xmlFirstElementChild(attribute_node); + function_attribute_node; + function_attribute_node = xmlNextElementSibling( + function_attribute_node)) { + /* Handle function name, binary path and lookup method. */ + if (!strcmp((const char *) function_attribute_node->name, + config_element_userspace_probe_function_location_function_name)) { + function_name = (char *) xmlNodeGetContent(function_attribute_node); + if (!function_name) { + goto error; + } + } else if (!strcmp((const char *) function_attribute_node->name, + config_element_userspace_probe_location_binary_path)) { + binary_path = (char *) xmlNodeGetContent(function_attribute_node); + if (!binary_path) { + goto error; + } + } else if (!strcmp((const char *) function_attribute_node->name, + config_element_userspace_probe_lookup)) { + char *lookup_method_name; + + lookup_method_name = (char *) xmlNodeGetContent( + function_attribute_node); + if (!lookup_method_name) { + goto error; + } + + /* + * function_default lookup method defaults to + * function_elf lookup method at the moment. + */ + if (!strcmp(lookup_method_name, config_element_userspace_probe_lookup_function_elf) + || !strcmp(lookup_method_name, config_element_userspace_probe_lookup_function_default)) { + lookup_method = lttng_userspace_probe_location_lookup_method_function_elf_create(); + if (!lookup_method) { + PERROR("Error creating function default/ELF lookup method"); + } + } else { + WARN("Unknown function lookup method"); + } + + free(lookup_method_name); + if (!lookup_method) { + goto error; + } + } else { + goto error; + } + + /* Check if all the necessary fields were found. */ + if (binary_path && function_name && lookup_method) { + /* Ownership of lookup_method is transferred. */ + location = + lttng_userspace_probe_location_function_create( + binary_path, function_name, + lookup_method); + lookup_method = NULL; + goto error; + } + } +error: + lttng_userspace_probe_location_lookup_method_destroy(lookup_method); + free(binary_path); + free(function_name); + return location; +} + +static +struct lttng_userspace_probe_location * +process_userspace_probe_tracepoint_attribute_node( + xmlNodePtr attribute_node) +{ + xmlNodePtr tracepoint_attribute_node; + char *probe_name = NULL, *provider_name = NULL, *binary_path = NULL; + struct lttng_userspace_probe_location *location = NULL; + struct lttng_userspace_probe_location_lookup_method *lookup_method = NULL; + + /* + * Process userspace probe location tracepoint attributes. The order of + * the fields are not guaranteed so we need to iterate over all fields + * and check at the end if everything we need for this location type is + * there. + */ + for (tracepoint_attribute_node = + xmlFirstElementChild(attribute_node); tracepoint_attribute_node; + tracepoint_attribute_node = xmlNextElementSibling( + tracepoint_attribute_node)) { + if (!strcmp((const char *) tracepoint_attribute_node->name, + config_element_userspace_probe_tracepoint_location_probe_name)) { + probe_name = (char *) xmlNodeGetContent(tracepoint_attribute_node); + if (!probe_name) { + goto error; + } + } else if (!strcmp((const char *) tracepoint_attribute_node->name, + config_element_userspace_probe_tracepoint_location_provider_name)) { + provider_name = (char *) xmlNodeGetContent(tracepoint_attribute_node); + if (!provider_name) { + goto error; + } + } else if (!strcmp((const char *) tracepoint_attribute_node->name, + config_element_userspace_probe_location_binary_path)) { + binary_path = (char *) xmlNodeGetContent(tracepoint_attribute_node); + if (!binary_path) { + goto error; + } + } else if (!strcmp((const char *) tracepoint_attribute_node->name, + config_element_userspace_probe_lookup)) { + char *lookup_method_name; + + lookup_method_name = (char *) xmlNodeGetContent( + tracepoint_attribute_node); + if (!lookup_method_name) { + goto error; + } + + if (!strcmp(lookup_method_name, + config_element_userspace_probe_lookup_tracepoint_sdt)) { + lookup_method = + lttng_userspace_probe_location_lookup_method_tracepoint_sdt_create(); + if (!lookup_method) { + PERROR("Error creating tracepoint SDT lookup method"); + } + } else { + WARN("Unknown tracepoint lookup method"); + } + + free(lookup_method_name); + if (!lookup_method) { + goto error; + } + } else { + WARN("Unknown tracepoint attribute"); + goto error; + } + + /* Check if all the necessary fields were found. */ + if (binary_path && provider_name && probe_name && lookup_method) { + /* Ownership of lookup_method is transferred. */ + location = + lttng_userspace_probe_location_tracepoint_create( + binary_path, provider_name, + probe_name, lookup_method); + lookup_method = NULL; + goto error; + } + } +error: + lttng_userspace_probe_location_lookup_method_destroy(lookup_method); + free(binary_path); + free(provider_name); + free(probe_name); + return location; +} + +static +int process_probe_attribute_node(xmlNodePtr probe_attribute_node, + struct lttng_event_probe_attr *attr) +{ + int ret; + + LTTNG_ASSERT(probe_attribute_node); + LTTNG_ASSERT(attr); + + if (!strcmp((const char *) probe_attribute_node->name, + config_element_address)) { + xmlChar *content; + uint64_t addr = 0; + + /* addr */ + content = xmlNodeGetContent(probe_attribute_node); + if (!content) { + ret = -LTTNG_ERR_NOMEM; + goto end; + } + + ret = parse_uint(content, &addr); + free(content); + if (ret) { + ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; + goto end; + } + + attr->addr = addr; + } else if (!strcmp((const char *) probe_attribute_node->name, + config_element_offset)) { + xmlChar *content; + uint64_t offset = 0; + + /* offset */ + content = xmlNodeGetContent(probe_attribute_node); + if (!content) { + ret = -LTTNG_ERR_NOMEM; + goto end; + } + + ret = parse_uint(content, &offset); + free(content); + if (ret) { + ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; + goto end; + } + + attr->offset = offset; + } else if (!strcmp((const char *) probe_attribute_node->name, + config_element_symbol_name)) { + xmlChar *content; + + /* symbol_name */ + content = xmlNodeGetContent(probe_attribute_node); + if (!content) { + ret = -LTTNG_ERR_NOMEM; + goto end; + } + + ret = lttng_strncpy(attr->symbol_name, + (const char *) content, + LTTNG_SYMBOL_NAME_LEN); + if (ret == -1) { + ERR("symbol name \"%s\"'s length (%zu) exceeds the maximal permitted length (%d) in session configuration", + (const char *) content, + strlen((const char *) content), + LTTNG_SYMBOL_NAME_LEN); + ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; + free(content); + goto end; + } + free(content); + } + ret = 0; +end: + return ret; +} + +static +int process_event_node(xmlNodePtr event_node, struct lttng_handle *handle, + const char *channel_name, const enum process_event_node_phase phase) +{ + int ret = 0, i; + xmlNodePtr node; + struct lttng_event *event; + char **exclusions = NULL; + unsigned long exclusion_count = 0; + char *filter_expression = NULL; + + LTTNG_ASSERT(event_node); + LTTNG_ASSERT(handle); + LTTNG_ASSERT(channel_name); + + event = lttng_event_create(); + if (!event) { + ret = -LTTNG_ERR_NOMEM; + goto end; + } + + /* Initialize default log level which varies by domain */ + switch (handle->domain.type) + { + case LTTNG_DOMAIN_JUL: + event->loglevel = LTTNG_LOGLEVEL_JUL_ALL; + break; + case LTTNG_DOMAIN_LOG4J: + event->loglevel = LTTNG_LOGLEVEL_LOG4J_ALL; + break; + case LTTNG_DOMAIN_PYTHON: + event->loglevel = LTTNG_LOGLEVEL_PYTHON_DEBUG; + break; + case LTTNG_DOMAIN_UST: + case LTTNG_DOMAIN_KERNEL: + event->loglevel = LTTNG_LOGLEVEL_DEBUG; + break; + default: + abort(); + } + + for (node = xmlFirstElementChild(event_node); node; + node = xmlNextElementSibling(node)) { + if (!strcmp((const char *) node->name, config_element_name)) { + xmlChar *content; + + /* name */ + content = xmlNodeGetContent(node); + if (!content) { + ret = -LTTNG_ERR_NOMEM; + goto end; + } + + ret = lttng_strncpy(event->name, + (const char *) content, + LTTNG_SYMBOL_NAME_LEN); + if (ret == -1) { + WARN("Event \"%s\"'s name length (%zu) exceeds the maximal permitted length (%d) in session configuration", + (const char *) content, + strlen((const char *) content), + LTTNG_SYMBOL_NAME_LEN); + ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; + free(content); + goto end; + } + free(content); + } else if (!strcmp((const char *) node->name, + config_element_enabled)) { + xmlChar *content = xmlNodeGetContent(node); + + /* enabled */ + if (!content) { + ret = -LTTNG_ERR_NOMEM; + goto end; + } + + ret = parse_bool(content, &event->enabled); + free(content); + if (ret) { + ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; + goto end; + } + } else if (!strcmp((const char *) node->name, + config_element_type)) { + xmlChar *content = xmlNodeGetContent(node); + + /* type */ + if (!content) { + ret = -LTTNG_ERR_NOMEM; + goto end; + } + + ret = get_event_type(content); + free(content); + if (ret < 0) { + ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; + goto end; + } + + event->type = (lttng_event_type) ret; + } else if (!strcmp((const char *) node->name, + config_element_loglevel_type)) { + xmlChar *content = xmlNodeGetContent(node); + + /* loglevel_type */ + if (!content) { + ret = -LTTNG_ERR_NOMEM; + goto end; + } + + ret = get_loglevel_type(content); + free(content); + if (ret < 0) { + ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; + goto end; + } + + event->loglevel_type = (lttng_loglevel_type) ret; + } else if (!strcmp((const char *) node->name, + config_element_loglevel)) { + xmlChar *content; + int64_t loglevel = 0; + + /* loglevel */ + content = xmlNodeGetContent(node); + if (!content) { + ret = -LTTNG_ERR_NOMEM; + goto end; + } + + ret = parse_int(content, &loglevel); + free(content); + if (ret) { + ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; + goto end; + } + + if (loglevel > INT_MAX || loglevel < INT_MIN) { + WARN("loglevel out of range."); + ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; + goto end; + } + + event->loglevel = loglevel; + } else if (!strcmp((const char *) node->name, + config_element_filter)) { + xmlChar *content = + xmlNodeGetContent(node); + + /* filter */ + if (!content) { + ret = -LTTNG_ERR_NOMEM; + goto end; + } + + free(filter_expression); + filter_expression = strdup((char *) content); + free(content); + if (!filter_expression) { + ret = -LTTNG_ERR_NOMEM; + goto end; + } + } else if (!strcmp((const char *) node->name, + config_element_exclusions)) { + xmlNodePtr exclusion_node; + int exclusion_index = 0; + + /* exclusions */ + if (exclusions) { + /* + * Exclusions has already been initialized, + * invalid file. + */ + ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; + goto end; + } + + exclusion_count = xmlChildElementCount(node); + if (!exclusion_count) { + continue; + } + + exclusions = (char **) zmalloc(exclusion_count * sizeof(char *)); + if (!exclusions) { + exclusion_count = 0; + ret = -LTTNG_ERR_NOMEM; + goto end; + } + + for (exclusion_node = xmlFirstElementChild(node); exclusion_node; + exclusion_node = xmlNextElementSibling(exclusion_node)) { + xmlChar *content = + xmlNodeGetContent(exclusion_node); + + if (!content) { + ret = -LTTNG_ERR_NOMEM; + goto end; + } + + exclusions[exclusion_index] = strdup((const char *) content); + free(content); + if (!exclusions[exclusion_index]) { + ret = -LTTNG_ERR_NOMEM; + goto end; + } + exclusion_index++; + } + + event->exclusion = 1; + } else if (!strcmp((const char *) node->name, + config_element_attributes)) { + xmlNodePtr attribute_node = xmlFirstElementChild(node); + + /* attributes */ + if (!attribute_node) { + ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; + goto end; + } + + if (!strcmp((const char *) attribute_node->name, + config_element_probe_attributes)) { + xmlNodePtr probe_attribute_node; + + /* probe_attributes */ + for (probe_attribute_node = + xmlFirstElementChild(attribute_node); probe_attribute_node; + probe_attribute_node = xmlNextElementSibling( + probe_attribute_node)) { + + ret = process_probe_attribute_node(probe_attribute_node, + &event->attr.probe); + if (ret) { + goto end; + } + } + } else if (!strcmp((const char *) attribute_node->name, + config_element_function_attributes)) { + size_t sym_len; + xmlChar *content; + xmlNodePtr symbol_node = xmlFirstElementChild(attribute_node); + + /* function_attributes */ + content = xmlNodeGetContent(symbol_node); + if (!content) { + ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; + goto end; + } + + sym_len = strlen((char *) content); + if (sym_len >= LTTNG_SYMBOL_NAME_LEN) { + WARN("Function name too long."); + ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; + free(content); + goto end; + } + + ret = lttng_strncpy( + event->attr.ftrace.symbol_name, + (char *) content, sym_len); + if (ret == -1) { + ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; + free(content); + goto end; + } + free(content); + } else if (!strcmp((const char *) attribute_node->name, + config_element_userspace_probe_tracepoint_attributes)) { + struct lttng_userspace_probe_location *location; + + location = process_userspace_probe_tracepoint_attribute_node(attribute_node); + if (!location) { + WARN("Error processing userspace probe tracepoint attribute"); + ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; + goto end; + } + ret = lttng_event_set_userspace_probe_location( + event, location); + if (ret) { + WARN("Error setting userspace probe location field"); + lttng_userspace_probe_location_destroy( + location); + ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; + goto end; + } + } else if (!strcmp((const char *) attribute_node->name, + config_element_userspace_probe_function_attributes)) { + struct lttng_userspace_probe_location *location; + + location = + process_userspace_probe_function_attribute_node( + attribute_node); + if (!location) { + WARN("Error processing userspace probe function attribute"); + ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; + goto end; + } + + ret = lttng_event_set_userspace_probe_location( + event, location); + if (ret) { + WARN("Error setting userspace probe location field"); + lttng_userspace_probe_location_destroy( + location); + ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; + goto end; + } + } else { + /* Unknown event attribute. */ + ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; + goto end; + } + } + } + + if ((event->enabled && phase == ENABLE) || phase == CREATION) { + ret = lttng_enable_event_with_exclusions(handle, event, channel_name, + filter_expression, exclusion_count, exclusions); + if (ret < 0) { + WARN("Enabling event (name:%s) on load failed.", event->name); + ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; + goto end; + } + } + ret = 0; +end: + for (i = 0; i < exclusion_count; i++) { + free(exclusions[i]); + } + + lttng_event_destroy(event); + free(exclusions); + free(filter_expression); + return ret; +} + +static +int process_events_node(xmlNodePtr events_node, struct lttng_handle *handle, + const char *channel_name) +{ + int ret = 0; + struct lttng_event event; + xmlNodePtr node; + + LTTNG_ASSERT(events_node); + LTTNG_ASSERT(handle); + LTTNG_ASSERT(channel_name); + + for (node = xmlFirstElementChild(events_node); node; + node = xmlNextElementSibling(node)) { + ret = process_event_node(node, handle, channel_name, CREATION); + if (ret) { + goto end; + } + } + + /* + * Disable all events to enable only the necessary events. + * Limitations regarding lttng_disable_events and tuple descriptor + * force this approach. + */ + memset(&event, 0, sizeof(event)); + event.loglevel = -1; + event.type = LTTNG_EVENT_ALL; + ret = lttng_disable_event_ext(handle, &event, channel_name, NULL); + if (ret) { + goto end; + } + + for (node = xmlFirstElementChild(events_node); node; + node = xmlNextElementSibling(node)) { + ret = process_event_node(node, handle, channel_name, ENABLE); + if (ret) { + goto end; + } + } + +end: + return ret; +} + +static +int process_channel_attr_node(xmlNodePtr attr_node, + struct lttng_channel *channel, xmlNodePtr *contexts_node, + xmlNodePtr *events_node) +{ + int ret; + + LTTNG_ASSERT(attr_node); + LTTNG_ASSERT(channel); + LTTNG_ASSERT(contexts_node); + LTTNG_ASSERT(events_node); + + if (!strcmp((const char *) attr_node->name, config_element_name)) { + xmlChar *content; + + /* name */ + content = xmlNodeGetContent(attr_node); + if (!content) { + ret = -LTTNG_ERR_NOMEM; + goto end; + } + + ret = lttng_strncpy(channel->name, + (const char *) content, + LTTNG_SYMBOL_NAME_LEN); + if (ret == -1) { + WARN("Channel \"%s\"'s name length (%zu) exceeds the maximal permitted length (%d) in session configuration", + (const char *) content, + strlen((const char *) content), + LTTNG_SYMBOL_NAME_LEN); + ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; + free(content); + goto end; + } + free(content); + } else if (!strcmp((const char *) attr_node->name, + config_element_enabled)) { + xmlChar *content; + int enabled; + + /* enabled */ + content = xmlNodeGetContent(attr_node); + if (!content) { + ret = -LTTNG_ERR_NOMEM; + goto end; + } + + ret = parse_bool(content, &enabled); + free(content); + if (ret) { + ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; + goto end; + } + + channel->enabled = enabled; + } else if (!strcmp((const char *) attr_node->name, + config_element_overwrite_mode)) { + xmlChar *content; + + /* overwrite_mode */ + content = xmlNodeGetContent(attr_node); + if (!content) { + ret = -LTTNG_ERR_NOMEM; + goto end; + } + + ret = get_overwrite_mode(content); + free(content); + if (ret < 0) { + ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; + goto end; + } + + channel->attr.overwrite = ret; + } else if (!strcmp((const char *) attr_node->name, + config_element_subbuf_size)) { + xmlChar *content; + + /* subbuffer_size */ + content = xmlNodeGetContent(attr_node); + if (!content) { + ret = -LTTNG_ERR_NOMEM; + goto end; + } + + ret = parse_uint(content, &channel->attr.subbuf_size); + free(content); + if (ret) { + ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; + goto end; + } + } else if (!strcmp((const char *) attr_node->name, + config_element_num_subbuf)) { + xmlChar *content; + + /* subbuffer_count */ + content = xmlNodeGetContent(attr_node); + if (!content) { + ret = -LTTNG_ERR_NOMEM; + goto end; + } + + ret = parse_uint(content, &channel->attr.num_subbuf); + free(content); + if (ret) { + ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; + goto end; + } + } else if (!strcmp((const char *) attr_node->name, + config_element_switch_timer_interval)) { + xmlChar *content; + uint64_t switch_timer_interval = 0; + + /* switch_timer_interval */ + content = xmlNodeGetContent(attr_node); + if (!content) { + ret = -LTTNG_ERR_NOMEM; + goto end; + } + + ret = parse_uint(content, &switch_timer_interval); + free(content); + if (ret) { + ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; + goto end; + } + + if (switch_timer_interval > UINT_MAX) { + WARN("switch_timer_interval out of range."); + ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; + goto end; + } + + channel->attr.switch_timer_interval = + switch_timer_interval; + } else if (!strcmp((const char *) attr_node->name, + config_element_read_timer_interval)) { + xmlChar *content; + uint64_t read_timer_interval = 0; + + /* read_timer_interval */ + content = xmlNodeGetContent(attr_node); + if (!content) { + ret = -LTTNG_ERR_NOMEM; + goto end; + } + + ret = parse_uint(content, &read_timer_interval); + free(content); + if (ret) { + ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; + goto end; + } + + if (read_timer_interval > UINT_MAX) { + WARN("read_timer_interval out of range."); + ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; + goto end; + } + + channel->attr.read_timer_interval = + read_timer_interval; + } else if (!strcmp((const char *) attr_node->name, + config_element_output_type)) { + xmlChar *content; + + /* output_type */ + content = xmlNodeGetContent(attr_node); + if (!content) { + ret = -LTTNG_ERR_NOMEM; + goto end; + } + + ret = get_output_type(content); + free(content); + if (ret < 0) { + ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; + goto end; + } + + channel->attr.output = (lttng_event_output) ret; + } else if (!strcmp((const char *) attr_node->name, + config_element_tracefile_size)) { + xmlChar *content; + + /* tracefile_size */ + content = xmlNodeGetContent(attr_node); + if (!content) { + ret = -LTTNG_ERR_NOMEM; + goto end; + } + + ret = parse_uint(content, &channel->attr.tracefile_size); + free(content); + if (ret) { + ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; + goto end; + } + } else if (!strcmp((const char *) attr_node->name, + config_element_tracefile_count)) { + xmlChar *content; + + /* tracefile_count */ + content = xmlNodeGetContent(attr_node); + if (!content) { + ret = -LTTNG_ERR_NOMEM; + goto end; + } + + ret = parse_uint(content, &channel->attr.tracefile_count); + free(content); + if (ret) { + ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; + goto end; + } + } else if (!strcmp((const char *) attr_node->name, + config_element_live_timer_interval)) { + xmlChar *content; + uint64_t live_timer_interval = 0; + + /* live_timer_interval */ + content = xmlNodeGetContent(attr_node); + if (!content) { + ret = -LTTNG_ERR_NOMEM; + goto end; + } + + ret = parse_uint(content, &live_timer_interval); + free(content); + if (ret) { + ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; + goto end; + } + + if (live_timer_interval > UINT_MAX) { + WARN("live_timer_interval out of range."); + ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; + goto end; + } + + channel->attr.live_timer_interval = + live_timer_interval; + } else if (!strcmp((const char *) attr_node->name, + config_element_monitor_timer_interval)) { + xmlChar *content; + uint64_t monitor_timer_interval = 0; + + /* monitor_timer_interval */ + content = xmlNodeGetContent(attr_node); + if (!content) { + ret = -LTTNG_ERR_NOMEM; + goto end; + } + + ret = parse_uint(content, &monitor_timer_interval); + free(content); + if (ret) { + ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; + goto end; + } + + ret = lttng_channel_set_monitor_timer_interval(channel, + monitor_timer_interval); + if (ret) { + ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; + goto end; + } + } else if (!strcmp((const char *) attr_node->name, + config_element_blocking_timeout)) { + xmlChar *content; + int64_t blocking_timeout = 0; + + /* blocking_timeout */ + content = xmlNodeGetContent(attr_node); + if (!content) { + ret = -LTTNG_ERR_NOMEM; + goto end; + } + + ret = parse_int(content, &blocking_timeout); + free(content); + if (ret) { + ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; + goto end; + } + + ret = lttng_channel_set_blocking_timeout(channel, + blocking_timeout); + if (ret) { + ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; + goto end; + } + } else if (!strcmp((const char *) attr_node->name, + config_element_events)) { + /* events */ + *events_node = attr_node; + } else { + /* contexts */ + *contexts_node = attr_node; + } + ret = 0; +end: + return ret; +} + +static +int process_context_node(xmlNodePtr context_node, + struct lttng_handle *handle, const char *channel_name) +{ + int ret; + struct lttng_event_context context; + xmlNodePtr context_child_node = xmlFirstElementChild(context_node); + + LTTNG_ASSERT(handle); + LTTNG_ASSERT(channel_name); + + if (!context_child_node) { + ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; + goto end; + } + + memset(&context, 0, sizeof(context)); + + if (!strcmp((const char *) context_child_node->name, + config_element_type)) { + /* type */ + xmlChar *content = xmlNodeGetContent(context_child_node); + + if (!content) { + ret = -LTTNG_ERR_NOMEM; + goto end; + } + + ret = get_context_type(content); + free(content); + if (ret < 0) { + ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; + goto end; + } + + context.ctx = (lttng_event_context_type) ret; + } else if (!strcmp((const char *) context_child_node->name, + config_element_context_perf)) { + /* perf */ + xmlNodePtr perf_attr_node; + + context.ctx = handle->domain.type == LTTNG_DOMAIN_KERNEL ? + LTTNG_EVENT_CONTEXT_PERF_CPU_COUNTER : + LTTNG_EVENT_CONTEXT_PERF_THREAD_COUNTER; + for (perf_attr_node = xmlFirstElementChild(context_child_node); + perf_attr_node; perf_attr_node = + xmlNextElementSibling(perf_attr_node)) { + if (!strcmp((const char *) perf_attr_node->name, + config_element_type)) { + xmlChar *content; + uint64_t type = 0; + + /* type */ + content = xmlNodeGetContent(perf_attr_node); + if (!content) { + ret = -LTTNG_ERR_NOMEM; + goto end; + } + + ret = parse_uint(content, &type); + free(content); + if (ret) { + ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; + goto end; + } + + if (type > UINT32_MAX) { + WARN("perf context type out of range."); + ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; + goto end; + } + + context.u.perf_counter.type = type; + } else if (!strcmp((const char *) perf_attr_node->name, + config_element_config)) { + xmlChar *content; + uint64_t config = 0; + + /* config */ + content = xmlNodeGetContent(perf_attr_node); + if (!content) { + ret = -LTTNG_ERR_NOMEM; + goto end; + } + + ret = parse_uint(content, &config); + free(content); + if (ret) { + ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; + goto end; + } + + context.u.perf_counter.config = config; + } else if (!strcmp((const char *) perf_attr_node->name, + config_element_name)) { + xmlChar *content; + + /* name */ + content = xmlNodeGetContent(perf_attr_node); + if (!content) { + ret = -LTTNG_ERR_NOMEM; + goto end; + } + + ret = lttng_strncpy(context.u.perf_counter.name, + (const char *) content, + LTTNG_SYMBOL_NAME_LEN); + if (ret == -1) { + WARN("Perf counter \"%s\"'s name length (%zu) exceeds the maximal permitted length (%d) in session configuration", + (const char *) content, + strlen((const char *) content), + LTTNG_SYMBOL_NAME_LEN); + ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; + free(content); + goto end; + } + free(content); + } + } + } else if (!strcmp((const char *) context_child_node->name, + config_element_context_app)) { + /* application context */ + xmlNodePtr app_ctx_node; + + context.ctx = LTTNG_EVENT_CONTEXT_APP_CONTEXT; + for (app_ctx_node = xmlFirstElementChild(context_child_node); + app_ctx_node; app_ctx_node = + xmlNextElementSibling(app_ctx_node)) { + xmlChar *content; + char **target = strcmp( + (const char *) app_ctx_node->name, + config_element_context_app_provider_name) == 0 ? + &context.u.app_ctx.provider_name : + &context.u.app_ctx.ctx_name; + + content = xmlNodeGetContent(app_ctx_node); + if (!content) { + ret = -LTTNG_ERR_NOMEM; + goto end; + } + + *target = (char *) content; + } + } else { + /* Unrecognized context type */ + ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; + goto end; + } + + ret = lttng_add_context(handle, &context, NULL, channel_name); + if (context.ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT) { + free(context.u.app_ctx.provider_name); + free(context.u.app_ctx.ctx_name); + } +end: + return ret; +} + +static +int process_contexts_node(xmlNodePtr contexts_node, + struct lttng_handle *handle, const char *channel_name) +{ + int ret = 0; + xmlNodePtr context_node; + + for (context_node = xmlFirstElementChild(contexts_node); context_node; + context_node = xmlNextElementSibling(context_node)) { + ret = process_context_node(context_node, handle, channel_name); + if (ret) { + goto end; + } + } +end: + return ret; +} + +static int get_tracker_elements(enum lttng_process_attr process_attr, + const char **element_id_tracker, + const char **element_value_type, + const char **element_value, + const char **element_value_alias, + const char **element_name) +{ + int ret = 0; + + switch (process_attr) { + case LTTNG_PROCESS_ATTR_PROCESS_ID: + *element_id_tracker = config_element_process_attr_tracker_pid; + *element_value_type = config_element_process_attr_pid_value; + *element_value = config_element_process_attr_id; + *element_value_alias = config_element_process_attr_id; + *element_name = NULL; + break; + case LTTNG_PROCESS_ATTR_VIRTUAL_PROCESS_ID: + *element_id_tracker = config_element_process_attr_tracker_vpid; + *element_value_type = config_element_process_attr_vpid_value; + *element_value = config_element_process_attr_id; + *element_value_alias = NULL; + *element_name = NULL; + break; + case LTTNG_PROCESS_ATTR_USER_ID: + *element_id_tracker = config_element_process_attr_tracker_uid; + *element_value_type = config_element_process_attr_uid_value; + *element_value = config_element_process_attr_id; + *element_value_alias = NULL; + *element_name = config_element_name; + break; + case LTTNG_PROCESS_ATTR_VIRTUAL_USER_ID: + *element_id_tracker = config_element_process_attr_tracker_vuid; + *element_value_type = config_element_process_attr_vuid_value; + *element_value = config_element_process_attr_id; + *element_value_alias = NULL; + *element_name = config_element_name; + break; + case LTTNG_PROCESS_ATTR_GROUP_ID: + *element_id_tracker = config_element_process_attr_tracker_gid; + *element_value_type = config_element_process_attr_gid_value; + *element_value = config_element_process_attr_id; + *element_value_alias = NULL; + *element_name = config_element_name; + break; + case LTTNG_PROCESS_ATTR_VIRTUAL_GROUP_ID: + *element_id_tracker = config_element_process_attr_tracker_vgid; + *element_value_type = config_element_process_attr_vgid_value; + *element_value = config_element_process_attr_id; + *element_value_alias = NULL; + *element_name = config_element_name; + break; + default: + ret = LTTNG_ERR_INVALID; + } + return ret; +} + +static int process_legacy_pid_tracker_node( + xmlNodePtr trackers_node, struct lttng_handle *handle) +{ + int ret = 0, child_count; + xmlNodePtr targets_node = NULL; + xmlNodePtr node; + const char *element_id_tracker; + const char *element_target_id; + const char *element_id; + const char *element_id_alias; + const char *element_name; + enum lttng_error_code tracker_handle_ret_code; + struct lttng_process_attr_tracker_handle *tracker_handle = NULL; + enum lttng_process_attr_tracker_handle_status status; + const enum lttng_process_attr process_attr = + handle->domain.type == LTTNG_DOMAIN_UST ? + LTTNG_PROCESS_ATTR_VIRTUAL_PROCESS_ID : + LTTNG_PROCESS_ATTR_PROCESS_ID; + + LTTNG_ASSERT(handle); + + tracker_handle_ret_code = lttng_session_get_tracker_handle( + handle->session_name, handle->domain.type, + process_attr, + &tracker_handle); + if (tracker_handle_ret_code != LTTNG_OK) { + ret = LTTNG_ERR_INVALID; + goto end; + } + + ret = get_tracker_elements(process_attr, &element_id_tracker, + &element_target_id, &element_id, &element_id_alias, + &element_name); + if (ret) { + goto end; + } + + /* Get the targets node */ + for (node = xmlFirstElementChild(trackers_node); node; + node = xmlNextElementSibling(node)) { + if (!strcmp((const char *) node->name, + config_element_tracker_targets_legacy)) { + targets_node = node; + break; + } + } + + if (!targets_node) { + ret = LTTNG_ERR_INVALID; + goto end; + } + + /* Go through all id target node */ + child_count = xmlChildElementCount(targets_node); + status = lttng_process_attr_tracker_handle_set_tracking_policy( + tracker_handle, + child_count == 0 ? LTTNG_TRACKING_POLICY_EXCLUDE_ALL : + LTTNG_TRACKING_POLICY_INCLUDE_SET); + if (status != LTTNG_PROCESS_ATTR_TRACKER_HANDLE_STATUS_OK) { + ret = LTTNG_ERR_UNK; + goto end; + } + + /* Add all tracked values. */ + for (node = xmlFirstElementChild(targets_node); node; + node = xmlNextElementSibling(node)) { + xmlNodePtr pid_target_node = node; + + /* get pid_target node and track it */ + for (node = xmlFirstElementChild(pid_target_node); node; + node = xmlNextElementSibling(node)) { + if (!strcmp((const char *) node->name, + config_element_tracker_pid_legacy)) { + int64_t id; + xmlChar *content = xmlNodeGetContent(node); + + if (!content) { + ret = LTTNG_ERR_LOAD_INVALID_CONFIG; + goto end; + } + + ret = parse_int(content, &id); + free(content); + if (ret) { + ret = LTTNG_ERR_LOAD_INVALID_CONFIG; + goto end; + } + + switch (process_attr) { + case LTTNG_PROCESS_ATTR_PROCESS_ID: + status = lttng_process_attr_process_id_tracker_handle_add_pid( + tracker_handle, + (pid_t) id); + break; + case LTTNG_PROCESS_ATTR_VIRTUAL_PROCESS_ID: + status = lttng_process_attr_virtual_process_id_tracker_handle_add_pid( + tracker_handle, + (pid_t) id); + break; + default: + ret = LTTNG_ERR_INVALID; + goto end; + } + } + switch (status) { + case LTTNG_PROCESS_ATTR_TRACKER_HANDLE_STATUS_OK: + continue; + case LTTNG_PROCESS_ATTR_TRACKER_HANDLE_STATUS_INVALID: + ret = LTTNG_ERR_INVALID; + break; + case LTTNG_PROCESS_ATTR_TRACKER_HANDLE_STATUS_EXISTS: + ret = LTTNG_ERR_PROCESS_ATTR_EXISTS; + break; + case LTTNG_PROCESS_ATTR_TRACKER_HANDLE_STATUS_MISSING: + ret = LTTNG_ERR_PROCESS_ATTR_MISSING; + break; + case LTTNG_PROCESS_ATTR_TRACKER_HANDLE_STATUS_ERROR: + case LTTNG_PROCESS_ATTR_TRACKER_HANDLE_STATUS_COMMUNICATION_ERROR: + default: + ret = LTTNG_ERR_UNK; + goto end; + } + } + node = pid_target_node; + } + +end: + lttng_process_attr_tracker_handle_destroy(tracker_handle); + return ret; + } + +static int process_id_tracker_node(xmlNodePtr id_tracker_node, + struct lttng_handle *handle, + enum lttng_process_attr process_attr) +{ + int ret = 0, child_count; + xmlNodePtr values_node = NULL; + xmlNodePtr node; + const char *element_id_tracker; + const char *element_target_id; + const char *element_id; + const char *element_id_alias; + const char *element_name; + enum lttng_error_code tracker_handle_ret_code; + struct lttng_process_attr_tracker_handle *tracker_handle = NULL; + enum lttng_process_attr_tracker_handle_status status; + + LTTNG_ASSERT(handle); + LTTNG_ASSERT(id_tracker_node); + + tracker_handle_ret_code = lttng_session_get_tracker_handle( + handle->session_name, handle->domain.type, process_attr, + &tracker_handle); + if (tracker_handle_ret_code != LTTNG_OK) { + ret = LTTNG_ERR_INVALID; + goto end; + } + + ret = get_tracker_elements(process_attr, &element_id_tracker, + &element_target_id, &element_id, &element_id_alias, + &element_name); + if (ret) { + goto end; + } + + /* get the values node */ + for (node = xmlFirstElementChild(id_tracker_node); node; + node = xmlNextElementSibling(node)) { + if (!strcmp((const char *) node->name, + config_element_process_attr_values)) { + values_node = node; + break; + } + } + + if (!values_node) { + ret = LTTNG_ERR_INVALID; + goto end; + } + + /* Go through all id target node */ + child_count = xmlChildElementCount(values_node); + status = lttng_process_attr_tracker_handle_set_tracking_policy( + tracker_handle, + child_count == 0 ? LTTNG_TRACKING_POLICY_EXCLUDE_ALL : + LTTNG_TRACKING_POLICY_INCLUDE_SET); + if (status != LTTNG_PROCESS_ATTR_TRACKER_HANDLE_STATUS_OK) { + ret = LTTNG_ERR_UNK; + goto end; + } + + /* Add all tracked values. */ + for (node = xmlFirstElementChild(values_node); node; + node = xmlNextElementSibling(node)) { + xmlNodePtr id_target_node = node; + + /* get id node and track it */ + for (node = xmlFirstElementChild(id_target_node); node; + node = xmlNextElementSibling(node)) { + if (!strcmp((const char *) node->name, element_id) || + (element_id_alias && + !strcmp((const char *) node->name, + element_id_alias))) { + int64_t id; + xmlChar *content = xmlNodeGetContent(node); + + if (!content) { + ret = LTTNG_ERR_LOAD_INVALID_CONFIG; + goto end; + } + + ret = parse_int(content, &id); + free(content); + if (ret) { + ret = LTTNG_ERR_LOAD_INVALID_CONFIG; + goto end; + } + + switch (process_attr) { + case LTTNG_PROCESS_ATTR_PROCESS_ID: + status = lttng_process_attr_process_id_tracker_handle_add_pid( + tracker_handle, + (pid_t) id); + break; + case LTTNG_PROCESS_ATTR_VIRTUAL_PROCESS_ID: + status = lttng_process_attr_virtual_process_id_tracker_handle_add_pid( + tracker_handle, + (pid_t) id); + break; + case LTTNG_PROCESS_ATTR_USER_ID: + status = lttng_process_attr_user_id_tracker_handle_add_uid( + tracker_handle, + (uid_t) id); + break; + case LTTNG_PROCESS_ATTR_VIRTUAL_USER_ID: + status = lttng_process_attr_virtual_user_id_tracker_handle_add_uid( + tracker_handle, + (uid_t) id); + break; + case LTTNG_PROCESS_ATTR_GROUP_ID: + status = lttng_process_attr_group_id_tracker_handle_add_gid( + tracker_handle, + (gid_t) id); + break; + case LTTNG_PROCESS_ATTR_VIRTUAL_GROUP_ID: + status = lttng_process_attr_virtual_group_id_tracker_handle_add_gid( + tracker_handle, + (gid_t) id); + break; + default: + ret = LTTNG_ERR_INVALID; + goto end; + } + } else if (element_name && + !strcmp((const char *) node->name, + element_name)) { + xmlChar *content = xmlNodeGetContent(node); + + if (!content) { + ret = LTTNG_ERR_LOAD_INVALID_CONFIG; + goto end; + } + + switch (process_attr) { + case LTTNG_PROCESS_ATTR_USER_ID: + status = lttng_process_attr_user_id_tracker_handle_add_user_name( + tracker_handle, + (const char *) content); + break; + case LTTNG_PROCESS_ATTR_VIRTUAL_USER_ID: + status = lttng_process_attr_virtual_user_id_tracker_handle_add_user_name( + tracker_handle, + (const char *) content); + break; + case LTTNG_PROCESS_ATTR_GROUP_ID: + status = lttng_process_attr_group_id_tracker_handle_add_group_name( + tracker_handle, + (const char *) content); + break; + case LTTNG_PROCESS_ATTR_VIRTUAL_GROUP_ID: + status = lttng_process_attr_virtual_group_id_tracker_handle_add_group_name( + tracker_handle, + (const char *) content); + break; + default: + free(content); + ret = LTTNG_ERR_INVALID; + goto end; + } + free(content); + } + switch (status) { + case LTTNG_PROCESS_ATTR_TRACKER_HANDLE_STATUS_OK: + continue; + case LTTNG_PROCESS_ATTR_TRACKER_HANDLE_STATUS_INVALID: + ret = LTTNG_ERR_INVALID; + break; + case LTTNG_PROCESS_ATTR_TRACKER_HANDLE_STATUS_EXISTS: + ret = LTTNG_ERR_PROCESS_ATTR_EXISTS; + break; + case LTTNG_PROCESS_ATTR_TRACKER_HANDLE_STATUS_MISSING: + ret = LTTNG_ERR_PROCESS_ATTR_MISSING; + break; + case LTTNG_PROCESS_ATTR_TRACKER_HANDLE_STATUS_ERROR: + case LTTNG_PROCESS_ATTR_TRACKER_HANDLE_STATUS_COMMUNICATION_ERROR: + default: + ret = LTTNG_ERR_UNK; + goto end; + } + } + node = id_target_node; + } + +end: + lttng_process_attr_tracker_handle_destroy(tracker_handle); + return ret; +} + +static +int process_domain_node(xmlNodePtr domain_node, const char *session_name) +{ + int ret; + struct lttng_domain domain {}; + struct lttng_handle *handle = NULL; + struct lttng_channel *channel = NULL; + xmlNodePtr channels_node = NULL; + xmlNodePtr trackers_node = NULL; + xmlNodePtr pid_tracker_node = NULL; + xmlNodePtr vpid_tracker_node = NULL; + xmlNodePtr uid_tracker_node = NULL; + xmlNodePtr vuid_tracker_node = NULL; + xmlNodePtr gid_tracker_node = NULL; + xmlNodePtr vgid_tracker_node = NULL; + xmlNodePtr node; + + LTTNG_ASSERT(session_name); + + ret = init_domain(domain_node, &domain); + if (ret) { + goto end; + } + + handle = lttng_create_handle(session_name, &domain); + if (!handle) { + ret = -LTTNG_ERR_NOMEM; + goto end; + } + + /* get the channels node */ + for (node = xmlFirstElementChild(domain_node); node; + node = xmlNextElementSibling(node)) { + if (!strcmp((const char *) node->name, + config_element_channels)) { + channels_node = node; + break; + } + } + + if (!channels_node) { + goto end; + } + + /* create all channels */ + for (node = xmlFirstElementChild(channels_node); node; + node = xmlNextElementSibling(node)) { + const enum lttng_domain_type original_domain = domain.type; + xmlNodePtr contexts_node = NULL; + xmlNodePtr events_node = NULL; + xmlNodePtr channel_attr_node; + + /* + * Channels of the "agent" types cannot be created directly. + * They are meant to be created implicitly through the + * activation of events in their domain. However, a user + * can override the default channel configuration attributes + * by creating the underlying UST channel _before_ enabling + * an agent domain event. + * + * Hence, the channel's type is substituted before the creation + * and restored by the time the events are created. + */ + switch (domain.type) { + case LTTNG_DOMAIN_JUL: + case LTTNG_DOMAIN_LOG4J: + case LTTNG_DOMAIN_PYTHON: + domain.type = LTTNG_DOMAIN_UST; + default: + break; + } + + channel = lttng_channel_create(&domain); + if (!channel) { + ret = -1; + goto end; + } + + for (channel_attr_node = xmlFirstElementChild(node); + channel_attr_node; channel_attr_node = + xmlNextElementSibling(channel_attr_node)) { + ret = process_channel_attr_node(channel_attr_node, + channel, &contexts_node, &events_node); + if (ret) { + goto end; + } + } + + ret = lttng_enable_channel(handle, channel); + if (ret < 0) { + goto end; + } + + /* Restore the original channel domain. */ + domain.type = original_domain; + + ret = process_events_node(events_node, handle, channel->name); + if (ret) { + goto end; + } + + ret = process_contexts_node(contexts_node, handle, + channel->name); + if (ret) { + goto end; + } + + lttng_channel_destroy(channel); + } + channel = NULL; + + /* get the trackers node */ + for (node = xmlFirstElementChild(domain_node); node; + node = xmlNextElementSibling(node)) { + if (!strcmp((const char *) node->name, + config_element_process_attr_trackers) || + !strcmp((const char *) node->name, + config_element_trackers_legacy)) { + if (trackers_node) { + ERR("Only one instance of `%s` or `%s` is allowed in a session configuration", + config_element_process_attr_trackers, + config_element_trackers_legacy); + ret = -1; + goto end; + } + trackers_node = node; + break; + } + } + + if (!trackers_node) { + goto end; + } + + for (node = xmlFirstElementChild(trackers_node); node; + node = xmlNextElementSibling(node)) { + if (!strcmp((const char *) node->name, + config_element_process_attr_tracker_pid)) { + pid_tracker_node = node; + ret = process_id_tracker_node(pid_tracker_node, handle, + LTTNG_PROCESS_ATTR_PROCESS_ID); + if (ret) { + goto end; + } + } + if (!strcmp((const char *) node->name, + config_element_process_attr_tracker_vpid)) { + vpid_tracker_node = node; + ret = process_id_tracker_node(vpid_tracker_node, handle, + LTTNG_PROCESS_ATTR_VIRTUAL_PROCESS_ID); + if (ret) { + goto end; + } + } + if (!strcmp((const char *) node->name, + config_element_process_attr_tracker_uid)) { + uid_tracker_node = node; + ret = process_id_tracker_node(uid_tracker_node, handle, + LTTNG_PROCESS_ATTR_USER_ID); + if (ret) { + goto end; + } + } + if (!strcmp((const char *) node->name, + config_element_process_attr_tracker_vuid)) { + vuid_tracker_node = node; + ret = process_id_tracker_node(vuid_tracker_node, handle, + LTTNG_PROCESS_ATTR_VIRTUAL_USER_ID); + if (ret) { + goto end; + } + } + if (!strcmp((const char *) node->name, + config_element_process_attr_tracker_gid)) { + gid_tracker_node = node; + ret = process_id_tracker_node(gid_tracker_node, handle, + LTTNG_PROCESS_ATTR_GROUP_ID); + if (ret) { + goto end; + } + } + if (!strcmp((const char *) node->name, + config_element_process_attr_tracker_vgid)) { + vgid_tracker_node = node; + ret = process_id_tracker_node(vgid_tracker_node, handle, + LTTNG_PROCESS_ATTR_VIRTUAL_GROUP_ID); + if (ret) { + goto end; + } + } + if (!strcmp((const char *) node->name, + config_element_pid_tracker_legacy)) { + ret = process_legacy_pid_tracker_node(node, handle); + if (ret) { + goto end; + } + } + } + +end: + lttng_channel_destroy(channel); + lttng_destroy_handle(handle); + return ret; +} + +static +int add_periodic_rotation(const char *name, uint64_t time_us) +{ + int ret; + enum lttng_rotation_status status; + struct lttng_rotation_schedule *periodic = + lttng_rotation_schedule_periodic_create(); + + if (!periodic) { + ret = -LTTNG_ERR_NOMEM; + goto error; + } + + status = lttng_rotation_schedule_periodic_set_period(periodic, + time_us); + if (status != LTTNG_ROTATION_STATUS_OK) { + ret = -LTTNG_ERR_INVALID; + goto error; + } + + status = lttng_session_add_rotation_schedule(name, periodic); + switch (status) { + case LTTNG_ROTATION_STATUS_OK: + ret = 0; + break; + case LTTNG_ROTATION_STATUS_SCHEDULE_ALREADY_SET: + case LTTNG_ROTATION_STATUS_INVALID: + ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; + break; + default: + ret = -LTTNG_ERR_UNK; + break; + } +error: + lttng_rotation_schedule_destroy(periodic); + return ret; +} + +static +int add_size_rotation(const char *name, uint64_t size_bytes) +{ + int ret; + enum lttng_rotation_status status; + struct lttng_rotation_schedule *size = + lttng_rotation_schedule_size_threshold_create(); + + if (!size) { + ret = -LTTNG_ERR_NOMEM; + goto error; + } + + status = lttng_rotation_schedule_size_threshold_set_threshold(size, + size_bytes); + if (status != LTTNG_ROTATION_STATUS_OK) { + ret = -LTTNG_ERR_INVALID; + goto error; + } + + status = lttng_session_add_rotation_schedule(name, size); + switch (status) { + case LTTNG_ROTATION_STATUS_OK: + ret = 0; + break; + case LTTNG_ROTATION_STATUS_SCHEDULE_ALREADY_SET: + case LTTNG_ROTATION_STATUS_INVALID: + ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; + break; + default: + ret = -LTTNG_ERR_UNK; + break; + } +error: + lttng_rotation_schedule_destroy(size); + return ret; +} + +static +int process_session_rotation_schedules_node( + xmlNodePtr schedules_node, + uint64_t *rotation_timer_interval, + uint64_t *rotation_size) +{ + int ret = 0; + xmlNodePtr child; + + for (child = xmlFirstElementChild(schedules_node); + child; + child = xmlNextElementSibling(child)) { + if (!strcmp((const char *) child->name, + config_element_rotation_schedule_periodic)) { + xmlChar *content; + xmlNodePtr time_us_node; + + /* periodic rotation schedule */ + time_us_node = xmlFirstElementChild(child); + if (!time_us_node || + strcmp((const char *) time_us_node->name, + config_element_rotation_schedule_periodic_time_us)) { + ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; + goto end; + } + + /* time_us child */ + content = xmlNodeGetContent(time_us_node); + if (!content) { + ret = -LTTNG_ERR_NOMEM; + goto end; + } + ret = parse_uint(content, rotation_timer_interval); + free(content); + if (ret) { + ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; + goto end; + } + } else if (!strcmp((const char *) child->name, + config_element_rotation_schedule_size_threshold)) { + xmlChar *content; + xmlNodePtr bytes_node; + + /* size_threshold rotation schedule */ + bytes_node = xmlFirstElementChild(child); + if (!bytes_node || + strcmp((const char *) bytes_node->name, + config_element_rotation_schedule_size_threshold_bytes)) { + ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; + goto end; + } + + /* bytes child */ + content = xmlNodeGetContent(bytes_node); + if (!content) { + ret = -LTTNG_ERR_NOMEM; + goto end; + } + ret = parse_uint(content, rotation_size); + free(content); + if (ret) { + ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; + goto end; + } + } + } + +end: + return ret; +} + +static +int process_session_node(xmlNodePtr session_node, const char *session_name, + int overwrite, + const struct config_load_session_override_attr *overrides) +{ + int ret, started = -1, snapshot_mode = -1; + uint64_t live_timer_interval = UINT64_MAX, + rotation_timer_interval = 0, + rotation_size = 0; + xmlChar *name = NULL; + xmlChar *shm_path = NULL; + xmlNodePtr domains_node = NULL; + xmlNodePtr output_node = NULL; + xmlNodePtr node; + xmlNodePtr attributes_child; + struct lttng_domain *kernel_domain = NULL; + struct lttng_domain *ust_domain = NULL; + struct lttng_domain *jul_domain = NULL; + struct lttng_domain *log4j_domain = NULL; + struct lttng_domain *python_domain = NULL; + + for (node = xmlFirstElementChild(session_node); node; + node = xmlNextElementSibling(node)) { + if (!name && !strcmp((const char *) node->name, + config_element_name)) { + /* name */ + xmlChar *node_content = xmlNodeGetContent(node); + if (!node_content) { + ret = -LTTNG_ERR_NOMEM; + goto error; + } + + name = node_content; + } else if (!domains_node && !strcmp((const char *) node->name, + config_element_domains)) { + /* domains */ + domains_node = node; + } else if (started == -1 && !strcmp((const char *) node->name, + config_element_started)) { + /* started */ + xmlChar *node_content = xmlNodeGetContent(node); + if (!node_content) { + ret = -LTTNG_ERR_NOMEM; + goto error; + } + + ret = parse_bool(node_content, &started); + free(node_content); + if (ret) { + ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; + goto error; + } + } else if (!output_node && !strcmp((const char *) node->name, + config_element_output)) { + /* output */ + output_node = node; + } else if (!shm_path && !strcmp((const char *) node->name, + config_element_shared_memory_path)) { + /* shared memory path */ + xmlChar *node_content = xmlNodeGetContent(node); + if (!node_content) { + ret = -LTTNG_ERR_NOMEM; + goto error; + } + + shm_path = node_content; + } else { + /* + * attributes, snapshot_mode, live_timer_interval, rotation_size, + * rotation_timer_interval. + */ + for (attributes_child = xmlFirstElementChild(node); attributes_child; + attributes_child = xmlNextElementSibling(attributes_child)) { + if (!strcmp((const char *) attributes_child->name, + config_element_snapshot_mode)) { + /* snapshot_mode */ + xmlChar *snapshot_mode_content = + xmlNodeGetContent(attributes_child); + if (!snapshot_mode_content) { + ret = -LTTNG_ERR_NOMEM; + goto error; + } + + ret = parse_bool(snapshot_mode_content, &snapshot_mode); + free(snapshot_mode_content); + if (ret) { + ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; + goto error; + } + } else if (!strcmp((const char *) attributes_child->name, + config_element_live_timer_interval)) { + /* live_timer_interval */ + xmlChar *timer_interval_content = + xmlNodeGetContent(attributes_child); + if (!timer_interval_content) { + ret = -LTTNG_ERR_NOMEM; + goto error; + } + + ret = parse_uint(timer_interval_content, &live_timer_interval); + free(timer_interval_content); + if (ret) { + ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; + goto error; + } + } else if (!strcmp((const char *) attributes_child->name, + config_element_rotation_schedules)) { + ret = process_session_rotation_schedules_node( + attributes_child, + &rotation_timer_interval, + &rotation_size); + if (ret) { + ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; + goto error; + } + + } + } + } + } + + if (!name) { + /* Mandatory attribute, as defined in the session XSD */ + ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; + goto error; + } + + if (session_name && strcmp((char *) name, session_name)) { + /* This is not the session we are looking for */ + ret = -LTTNG_ERR_NO_SESSION; + goto error; + } + + /* Init domains to create the session handles */ + for (node = xmlFirstElementChild(domains_node); node; + node = xmlNextElementSibling(node)) { + struct lttng_domain *domain; + + domain = (lttng_domain *) zmalloc(sizeof(*domain)); + if (!domain) { + ret = -LTTNG_ERR_NOMEM; + goto error; + } + + ret = init_domain(node, domain); + if (ret) { + goto domain_init_error; + } + + switch (domain->type) { + case LTTNG_DOMAIN_KERNEL: + if (kernel_domain) { + /* Same domain seen twice, invalid! */ + goto domain_init_error; + } + kernel_domain = domain; + break; + case LTTNG_DOMAIN_UST: + if (ust_domain) { + /* Same domain seen twice, invalid! */ + goto domain_init_error; + } + ust_domain = domain; + break; + case LTTNG_DOMAIN_JUL: + if (jul_domain) { + /* Same domain seen twice, invalid! */ + goto domain_init_error; + } + jul_domain = domain; + break; + case LTTNG_DOMAIN_LOG4J: + if (log4j_domain) { + /* Same domain seen twice, invalid! */ + goto domain_init_error; + } + log4j_domain = domain; + break; + case LTTNG_DOMAIN_PYTHON: + if (python_domain) { + /* Same domain seen twice, invalid! */ + goto domain_init_error; + } + python_domain = domain; + break; + default: + WARN("Invalid domain type"); + goto domain_init_error; + } + continue; +domain_init_error: + free(domain); + ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; + goto error; + } + + /* Apply overrides */ + if (overrides) { + if (overrides->session_name) { + xmlChar *name_override = xmlStrdup(BAD_CAST(overrides->session_name)); + if (!name_override) { + ret = -LTTNG_ERR_NOMEM; + goto error; + } + + /* Overrides the session name to the provided name */ + xmlFree(name); + name = name_override; + } + } + + if (overwrite) { + /* Destroy session if it exists */ + ret = lttng_destroy_session((const char *) name); + if (ret && ret != -LTTNG_ERR_SESS_NOT_FOUND) { + ERR("Failed to destroy existing session."); + goto error; + } + } + + /* Create session type depending on output type */ + if (snapshot_mode && snapshot_mode != -1) { + ret = create_snapshot_session((const char *) name, output_node, + overrides); + } else if (live_timer_interval && + live_timer_interval != UINT64_MAX) { + ret = create_session((const char *) name, + output_node, live_timer_interval, overrides); + } else { + /* regular session */ + ret = create_session((const char *) name, + output_node, UINT64_MAX, overrides); + } + if (ret) { + goto error; + } + + if (shm_path) { + ret = lttng_set_session_shm_path((const char *) name, + (const char *) shm_path); + if (ret) { + goto error; + } + } + + for (node = xmlFirstElementChild(domains_node); node; + node = xmlNextElementSibling(node)) { + ret = process_domain_node(node, (const char *) name); + if (ret) { + goto end; + } + } + + if (rotation_timer_interval) { + ret = add_periodic_rotation((const char *) name, + rotation_timer_interval); + if (ret < 0) { + goto error; + } + } + if (rotation_size) { + ret = add_size_rotation((const char *) name, + rotation_size); + if (ret < 0) { + goto error; + } + } + + if (started) { + ret = lttng_start_tracing((const char *) name); + if (ret) { + goto end; + } + } + +end: + if (ret < 0) { + ERR("Failed to load session %s: %s", (const char *) name, + lttng_strerror(ret)); + lttng_destroy_session((const char *) name); + } + +error: + free(kernel_domain); + free(ust_domain); + free(jul_domain); + free(log4j_domain); + free(python_domain); + xmlFree(name); + xmlFree(shm_path); + return ret; +} + +/* + * Return 1 if the given path is readable by the current UID or 0 if not. + * Return -1 if the path is EPERM. + */ +static int validate_file_read_creds(const char *path) +{ + int ret; + + LTTNG_ASSERT(path); + + /* Can we read the file. */ + ret = access(path, R_OK); + if (!ret) { + goto valid; + } + if (errno == EACCES) { + return -1; + } else { + /* Invalid. */ + return 0; + } +valid: + return 1; +} + +static +int load_session_from_file(const char *path, const char *session_name, + struct session_config_validation_ctx *validation_ctx, int overwrite, + const struct config_load_session_override_attr *overrides) +{ + int ret, session_found = !session_name; + xmlDocPtr doc = NULL; + xmlNodePtr sessions_node; + xmlNodePtr session_node; + + LTTNG_ASSERT(path); + LTTNG_ASSERT(validation_ctx); + + ret = validate_file_read_creds(path); + if (ret != 1) { + if (ret == -1) { + ret = -LTTNG_ERR_EPERM; + } else { + ret = -LTTNG_ERR_LOAD_SESSION_NOENT; + } + goto end; + } + + doc = xmlParseFile(path); + if (!doc) { + ret = -LTTNG_ERR_LOAD_IO_FAIL; + goto end; + } + + ret = xmlSchemaValidateDoc(validation_ctx->schema_validation_ctx, doc); + if (ret) { + ERR("Session configuration file validation failed"); + ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; + goto end; + } + + sessions_node = xmlDocGetRootElement(doc); + if (!sessions_node) { + ret = -LTTNG_ERR_LOAD_INVALID_CONFIG; + goto end; + } + + for (session_node = xmlFirstElementChild(sessions_node); + session_node; session_node = + xmlNextElementSibling(session_node)) { + ret = process_session_node(session_node, + session_name, overwrite, overrides); + if (!session_name && ret) { + /* Loading error occurred. */ + goto end; + } else if (session_name) { + if (ret == 0) { + /* Target session found and loaded */ + session_found = 1; + break; + } else if (ret == -LTTNG_ERR_NO_SESSION) { + /* + * Ignore this error, we are looking for a + * specific session. + */ + ret = 0; + } else { + /* Loading error occurred. */ + goto end; + } + } + } +end: + xmlFreeDoc(doc); + if (!ret) { + ret = session_found ? 0 : -LTTNG_ERR_LOAD_SESSION_NOENT; + } + return ret; +} + +static +int load_session_from_path(const char *path, const char *session_name, + struct session_config_validation_ctx *validation_ctx, int overwrite, + const struct config_load_session_override_attr *overrides) +{ + int ret, session_found = !session_name; + DIR *directory = NULL; + struct lttng_dynamic_buffer file_path; + size_t path_len; + + LTTNG_ASSERT(path); + LTTNG_ASSERT(validation_ctx); + path_len = strlen(path); + lttng_dynamic_buffer_init(&file_path); + if (path_len >= LTTNG_PATH_MAX) { + ERR("Session configuration load path \"%s\" length (%zu) exceeds the maximal length allowed (%d)", + path, path_len, LTTNG_PATH_MAX); + ret = -LTTNG_ERR_INVALID; + goto end; + } + + directory = opendir(path); + if (!directory) { + switch (errno) { + case ENOTDIR: + /* Try the file loading. */ + break; + case ENOENT: + ret = -LTTNG_ERR_LOAD_SESSION_NOENT; + goto end; + default: + ret = -LTTNG_ERR_LOAD_IO_FAIL; + goto end; + } + } + if (directory) { + size_t file_path_root_len; + + ret = lttng_dynamic_buffer_set_capacity(&file_path, + LTTNG_PATH_MAX); + if (ret) { + ret = -LTTNG_ERR_NOMEM; + goto end; + } + + ret = lttng_dynamic_buffer_append(&file_path, path, path_len); + if (ret) { + ret = -LTTNG_ERR_NOMEM; + goto end; + } + + if (file_path.data[file_path.size - 1] != '/') { + ret = lttng_dynamic_buffer_append(&file_path, "/", 1); + if (ret) { + ret = -LTTNG_ERR_NOMEM; + goto end; + } + } + file_path_root_len = file_path.size; + + /* Search for *.lttng files */ + for (;;) { + size_t file_name_len; + struct dirent *result; + + /* + * When the end of the directory stream is reached, NULL + * is returned and errno is kept unchanged. When an + * error occurs, NULL is returned and errno is set + * accordingly. To distinguish between the two, set + * errno to zero before calling readdir(). + * + * On success, readdir() returns a pointer to a dirent + * structure. This structure may be statically + * allocated, do not attempt to free(3) it. + */ + errno = 0; + result = readdir(directory); + + /* Reached end of dir stream or error out. */ + if (!result) { + if (errno) { + PERROR("Failed to enumerate the contents of path \"%s\" while loading session, readdir returned", path); + ret = -LTTNG_ERR_LOAD_IO_FAIL; + goto end; + } + break; + } + + file_name_len = strlen(result->d_name); + + if (file_name_len <= + sizeof(DEFAULT_SESSION_CONFIG_FILE_EXTENSION)) { + continue; + } + + if (file_path.size + file_name_len >= LTTNG_PATH_MAX) { + WARN("Ignoring file \"%s\" since the path's length (%zu) would exceed the maximal permitted size (%d)", + result->d_name, + /* +1 to account for NULL terminator. */ + file_path.size + file_name_len + 1, + LTTNG_PATH_MAX); + continue; + } + + /* Does the file end with .lttng? */ + if (strcmp(DEFAULT_SESSION_CONFIG_FILE_EXTENSION, + result->d_name + file_name_len - sizeof( + DEFAULT_SESSION_CONFIG_FILE_EXTENSION) + 1)) { + continue; + } + + ret = lttng_dynamic_buffer_append(&file_path, result->d_name, + file_name_len + 1); + if (ret) { + ret = -LTTNG_ERR_NOMEM; + goto end; + } + + ret = load_session_from_file(file_path.data, session_name, + validation_ctx, overwrite, overrides); + if (session_name && + (!ret || ret != -LTTNG_ERR_LOAD_SESSION_NOENT)) { + session_found = 1; + break; + } + if (ret && ret != -LTTNG_ERR_LOAD_SESSION_NOENT) { + goto end; + } + /* + * Reset the buffer's size to the location of the + * path's trailing '/'. + */ + ret = lttng_dynamic_buffer_set_size(&file_path, + file_path_root_len); + if (ret) { + ret = -LTTNG_ERR_UNK; + goto end; + } + } + } else { + ret = load_session_from_file(path, session_name, + validation_ctx, overwrite, overrides); + if (ret) { + goto end; + } + session_found = 1; + } + + ret = 0; +end: + if (directory) { + if (closedir(directory)) { + PERROR("closedir"); + } + } + if (!ret && !session_found) { + ret = -LTTNG_ERR_LOAD_SESSION_NOENT; + } + lttng_dynamic_buffer_reset(&file_path); + return ret; +} + +/* + * Validate that the given path's credentials and the current process have the + * same UID. If so, return 1 else return 0 if it does NOT match. + */ +static int validate_path_creds(const char *path) +{ + int ret, uid = getuid(); + struct stat buf; + + LTTNG_ASSERT(path); + + if (uid == 0) { + goto valid; + } + + ret = stat(path, &buf); + if (ret < 0) { + if (errno != ENOENT) { + PERROR("stat"); + } + goto valid; + } + + if (buf.st_uid != uid) { + goto invalid; + } + +valid: + return 1; +invalid: + return 0; +} + +int config_load_session(const char *path, const char *session_name, + int overwrite, unsigned int autoload, + const struct config_load_session_override_attr *overrides) +{ + int ret; + bool session_loaded = false; + const char *path_ptr = NULL; + struct session_config_validation_ctx validation_ctx = { 0 }; + + ret = init_session_config_validation_ctx(&validation_ctx); + if (ret) { + goto end; + } + + if (!path) { + const char *home_path; + const char *sys_path; + + /* Try home path */ + home_path = utils_get_home_dir(); + if (home_path) { + char path_buf[PATH_MAX]; + + /* + * Try user session configuration path. Ignore error here so we can + * continue loading the system wide sessions. + */ + if (autoload) { + ret = snprintf(path_buf, sizeof(path_buf), + DEFAULT_SESSION_HOME_CONFIGPATH + "/" DEFAULT_SESSION_CONFIG_AUTOLOAD, + home_path); + if (ret < 0) { + PERROR("snprintf session autoload home config path"); + ret = -LTTNG_ERR_INVALID; + goto end; + } + + /* + * Credentials are only validated for the autoload in order to + * avoid any user session daemon to try to load kernel sessions + * automatically and failing all the times. + */ + ret = validate_path_creds(path_buf); + if (ret) { + path_ptr = path_buf; + } + } else { + ret = snprintf(path_buf, sizeof(path_buf), + DEFAULT_SESSION_HOME_CONFIGPATH, + home_path); + if (ret < 0) { + PERROR("snprintf session home config path"); + ret = -LTTNG_ERR_INVALID; + goto end; + } + path_ptr = path_buf; + } + if (path_ptr) { + ret = load_session_from_path(path_ptr, session_name, + &validation_ctx, overwrite, overrides); + if (ret && ret != -LTTNG_ERR_LOAD_SESSION_NOENT) { + goto end; + } + /* + * Continue even if the session was found since we have to try + * the system wide sessions. + */ + session_loaded = true; + } + } + + /* Reset path pointer for the system wide dir. */ + path_ptr = NULL; + + /* Try system wide configuration directory. */ + if (autoload) { + sys_path = DEFAULT_SESSION_SYSTEM_CONFIGPATH "/" + DEFAULT_SESSION_CONFIG_AUTOLOAD; + ret = validate_path_creds(sys_path); + if (ret) { + path_ptr = sys_path; + } + } else { + sys_path = DEFAULT_SESSION_SYSTEM_CONFIGPATH; + path_ptr = sys_path; + } + + if (path_ptr) { + ret = load_session_from_path(path_ptr, session_name, + &validation_ctx, overwrite, overrides); + if (!ret) { + session_loaded = true; + } + } else { + ret = 0; + } + } else { + ret = access(path, F_OK); + if (ret < 0) { + PERROR("access"); + switch (errno) { + case ENOENT: + ret = -LTTNG_ERR_INVALID; + WARN("Session configuration path does not exist."); + break; + case EACCES: + ret = -LTTNG_ERR_EPERM; + break; + default: + ret = -LTTNG_ERR_UNK; + break; + } + goto end; + } + + ret = load_session_from_path(path, session_name, + &validation_ctx, overwrite, overrides); + } +end: + fini_session_config_validation_ctx(&validation_ctx); + if (ret == -LTTNG_ERR_LOAD_SESSION_NOENT && !session_name && !path) { + /* + * Don't report an error if no sessions are found when called + * without a session_name or a search path. + */ + ret = 0; + } + + if (session_loaded && ret == -LTTNG_ERR_LOAD_SESSION_NOENT) { + /* A matching session was found in one of the search paths. */ + ret = 0; + } + return ret; +} + +static +void __attribute__((destructor)) session_config_exit(void) +{ + xmlCleanupParser(); +}