+/*
+ * Copyright (C) 2013 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License, version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc., 51
+ * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#define _LGPL_SOURCE
+#include <assert.h>
+#include <ctype.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <inttypes.h>
+#include <dirent.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+
+#include <common/defaults.h>
+#include <common/error.h>
+#include <common/macros.h>
+#include <common/utils.h>
+#include <common/compat/getenv.h>
+#include <lttng/lttng-error.h>
+#include <libxml/parser.h>
+#include <libxml/valid.h>
+#include <libxml/xmlschemas.h>
+#include <libxml/tree.h>
+#include <lttng/lttng.h>
+#include <lttng/snapshot.h>
+
+#include "session-config.h"
+#include "config-internal.h"
+
+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_str_yes = "yes";
+const char * const config_str_true = "true";
+const char * const config_str_on = "on";
+const char * const config_str_no = "no";
+const char * const config_str_false = "false";
+const char * const config_str_off = "off";
+const char * const config_xml_encoding = "UTF-8";
+const size_t config_xml_encoding_bytes_per_char = 2; /* Size of the encoding's largest character */
+const char * const config_xml_indent_string = "\t";
+const char * const config_xml_true = "true";
+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_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_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_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_perf = "perf";
+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_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_pid_tracker = "pid_tracker";
+const char * const config_element_trackers = "trackers";
+const char * const config_element_targets = "targets";
+const char * const config_element_target_pid = "pid_target";
+
+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_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";
+
+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 };
+
+ 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;
+}
+
+LTTNG_HIDDEN
+int config_get_section_entries(const char *override_path, const char *section,
+ config_entry_handler_cb handler, void *user_data)
+{
+ int ret = 0;
+ 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;
+}
+
+LTTNG_HIDDEN
+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;
+
+ 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;
+}
+
+LTTNG_HIDDEN
+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;
+}
+
+LTTNG_HIDDEN
+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;
+}
+
+LTTNG_HIDDEN
+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;
+}
+
+LTTNG_HIDDEN
+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;
+}
+
+LTTNG_HIDDEN
+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;
+}
+
+LTTNG_HIDDEN
+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;
+}
+
+LTTNG_HIDDEN
+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);
+}
+
+LTTNG_HIDDEN
+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()
+{
+ 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;
+ }
+
+ strncpy(xsd_path, base_path, max_path_len);
+ if (xsd_path[base_path_len - 1] != '/') {
+ xsd_path[base_path_len++] = '/';
+ }
+
+ strncpy(xsd_path + base_path_len, DEFAULT_SESSION_CONFIG_XSD_FILENAME,
+ max_path_len - base_path_len);
+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)) {
+ *val = 1;
+ } else if (!strcmp((const char *) str, config_xml_false)) {
+ *val = 0;
+ } else {
+ WARN("Invalid boolean value encoutered (%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_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 {
+ 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;
+
+ 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, struct lttng_domain *domain,
+ const char *control_uri, const char *data_uri)
+{
+ int ret;
+ struct lttng_handle *handle;
+ const char *uri = NULL;
+
+ assert(name);
+ assert(domain);
+
+ handle = lttng_create_handle(name, domain);
+ 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)
+{
+ int ret;
+ xmlNodePtr node = NULL;
+ xmlNodePtr snapshot_output_list_node;
+ xmlNodePtr snapshot_output_node;
+
+ 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;
+
+ 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;
+ }
+ }
+ }
+
+ 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 (output.path) {
+ ret = lttng_snapshot_output_set_ctrl_url(output.path,
+ snapshot_output);
+ if (ret) {
+ goto error_snapshot_output;
+ }
+ } else {
+ if (output.control_uri) {
+ ret = lttng_snapshot_output_set_ctrl_url(output.control_uri,
+ snapshot_output);
+ if (ret) {
+ goto error_snapshot_output;
+ }
+ }
+
+ if (output.data_uri) {
+ ret = lttng_snapshot_output_set_data_url(output.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,
+ struct lttng_domain *kernel_domain,
+ struct lttng_domain *ust_domain,
+ struct lttng_domain *jul_domain,
+ struct lttng_domain *log4j_domain,
+ xmlNodePtr output_node,
+ uint64_t live_timer_interval)
+{
+ int ret;
+ struct consumer_output output = { 0 };
+ xmlNodePtr consumer_output_node;
+
+ 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;
+ }
+ }
+
+ if (live_timer_interval != UINT64_MAX &&
+ !output.control_uri && !output.data_uri) {
+ ret = -LTTNG_ERR_LOAD_INVALID_CONFIG;
+ goto end;
+ }
+
+ if (output.control_uri || output.data_uri) {
+ int i;
+ struct lttng_domain *domain;
+ struct lttng_domain *domains[] =
+ { kernel_domain, ust_domain, jul_domain, log4j_domain };
+
+ /* 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;
+ }
+
+ for (i = 0; i < (sizeof(domains) / sizeof(domains[0])); i++) {
+ domain = domains[i];
+ if (!domain) {
+ continue;
+ }
+
+ ret = create_session_net_output(name, domain, output.control_uri,
+ output.data_uri);
+ if (ret) {
+ goto end;
+ }
+ }
+ } else {
+ /* either local output or no output */
+ ret = lttng_create_session(name, output.path);
+ if (ret) {
+ goto end;
+ }
+ }
+end:
+ free(output.path);
+ free(output.control_uri);
+ free(output.data_uri);
+ return ret;
+}
+static
+int process_probe_attribute_node(xmlNodePtr probe_attribute_node,
+ struct lttng_event_probe_attr *attr)
+{
+ int ret;
+
+ assert(probe_attribute_node);
+ 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;
+ size_t name_len;
+
+ /* symbol_name */
+ content = xmlNodeGetContent(probe_attribute_node);
+ if (!content) {
+ ret = -LTTNG_ERR_NOMEM;
+ goto end;
+ }
+
+ name_len = strlen((char *) content);
+ if (name_len >= LTTNG_SYMBOL_NAME_LEN) {
+ WARN("symbol_name too long.");
+ ret = -LTTNG_ERR_LOAD_INVALID_CONFIG;
+ free(content);
+ goto end;
+ }
+
+ strncpy(attr->symbol_name, (const char *) content, name_len);
+ free(content);
+ }
+ ret = 0;
+end:
+ return ret;
+}
+
+static
+int process_event_node(xmlNodePtr event_node, struct lttng_handle *handle,
+ const char *channel_name)
+{
+ int ret, i;
+ xmlNodePtr node;
+ struct lttng_event event;
+ char **exclusions = NULL;
+ unsigned long exclusion_count = 0;
+ char *filter_expression = NULL;
+
+ assert(event_node);
+ assert(handle);
+ assert(channel_name);
+
+ memset(&event, 0, sizeof(event));
+
+ /* 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:
+ assert(0);
+ }
+
+ for (node = xmlFirstElementChild(event_node); node;
+ node = xmlNextElementSibling(node)) {
+ if (!strcmp((const char *) node->name, config_element_name)) {
+ xmlChar *content;
+ size_t name_len;
+
+ /* name */
+ content = xmlNodeGetContent(node);
+ if (!content) {
+ ret = -LTTNG_ERR_NOMEM;
+ goto end;
+ }
+
+ name_len = strlen((char *) content);
+ if (name_len >= LTTNG_SYMBOL_NAME_LEN) {
+ WARN("Channel name too long.");
+ ret = -LTTNG_ERR_LOAD_INVALID_CONFIG;
+ free(content);
+ goto end;
+ }
+
+ strncpy(event.name, (const char *) content, name_len);
+ 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;
+ }
+
+ 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 *) 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 {
+ 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;
+ }
+
+ strncpy(event.attr.ftrace.symbol_name, (char *) content,
+ sym_len);
+ free(content);
+ }
+ }
+ }
+
+ ret = lttng_enable_event_with_exclusions(handle, &event, channel_name,
+ filter_expression, exclusion_count, exclusions);
+ if (ret) {
+ goto end;
+ }
+
+ if (!event.enabled) {
+ /*
+ * Note that we should use lttng_disable_event_ext() (2.6+) to
+ * eliminate the risk of clashing on events of the same
+ * name (with different event types and loglevels).
+ *
+ * Unfortunately, lttng_disable_event_ext() only performs a
+ * match on the name and event type and errors out if any other
+ * event attribute is not set to its default value.
+ *
+ * This will disable all events that match this name.
+ */
+ ret = lttng_disable_event(handle, event.name, channel_name);
+ }
+end:
+ for (i = 0; i < exclusion_count; i++) {
+ free(exclusions[i]);
+ }
+
+ 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;
+ xmlNodePtr node;
+
+ assert(events_node);
+ assert(handle);
+ assert(channel_name);
+
+ for (node = xmlFirstElementChild(events_node); node;
+ node = xmlNextElementSibling(node)) {
+ ret = process_event_node(node, handle, channel_name);
+ 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;
+
+ assert(attr_node);
+ assert(channel);
+ assert(contexts_node);
+ assert(events_node);
+
+ if (!strcmp((const char *) attr_node->name, config_element_name)) {
+ xmlChar *content;
+ size_t name_len;
+
+ /* name */
+ content = xmlNodeGetContent(attr_node);
+ if (!content) {
+ ret = -LTTNG_ERR_NOMEM;
+ goto end;
+ }
+
+ name_len = strlen((char *) content);
+ if (name_len >= LTTNG_SYMBOL_NAME_LEN) {
+ WARN("Channel name too long.");
+ ret = -LTTNG_ERR_LOAD_INVALID_CONFIG;
+ free(content);
+ goto end;
+ }
+
+ strncpy(channel->name, (const char *) content, name_len);
+ 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_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);
+
+ assert(handle);
+ 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 {
+ xmlNodePtr perf_attr_node;
+
+ /* perf */
+ 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;
+ size_t name_len;
+
+ /* name */
+ content = xmlNodeGetContent(perf_attr_node);
+ if (!content) {
+ ret = -LTTNG_ERR_NOMEM;
+ goto end;
+ }
+
+ name_len = strlen((char *) content);
+ if (name_len >= LTTNG_SYMBOL_NAME_LEN) {
+ WARN("perf context name too long.");
+ ret = -LTTNG_ERR_LOAD_INVALID_CONFIG;
+ free(content);
+ goto end;
+ }
+
+ strncpy(context.u.perf_counter.name, (const char *) content,
+ name_len);
+ free(content);
+ }
+ }
+ }
+
+ ret = lttng_add_context(handle, &context, NULL, channel_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 process_pid_tracker_node(xmlNodePtr pid_tracker_node,
+ struct lttng_handle *handle)
+{
+ int ret = 0, child;
+ xmlNodePtr targets_node = NULL;
+ xmlNodePtr node;
+
+ assert(handle);
+ assert(pid_tracker_node);
+ /* get the targets node */
+ for (node = xmlFirstElementChild(pid_tracker_node); node;
+ node = xmlNextElementSibling(node)) {
+ if (!strcmp((const char *) node->name,
+ config_element_targets)) {
+ targets_node = node;
+ break;
+ }
+ }
+
+ if (!targets_node) {
+ ret = LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ /* Go through all pid_target node */
+ child = xmlChildElementCount(targets_node);
+ if (child == 0) {
+ /* The session is explicitly set to target nothing. */
+ ret = lttng_untrack_pid(handle, -1);
+ if (ret) {
+ goto end;
+ }
+ }
+ for (node = xmlFirstElementChild(targets_node); node;
+ node = xmlNextElementSibling(node)) {
+ xmlNodePtr pid_target_node = node;
+
+ /* get pid node and track it */
+ for (node = xmlFirstElementChild(pid_target_node); node;
+ node = xmlNextElementSibling(node)) {
+ if (!strcmp((const char *) node->name,
+ config_element_pid)) {
+ int64_t pid;
+ xmlChar *content = NULL;
+
+ content = xmlNodeGetContent(node);
+ if (!content) {
+ ret = LTTNG_ERR_LOAD_INVALID_CONFIG;
+ goto end;
+ }
+
+ ret = parse_int(content, &pid);
+ free(content);
+ if (ret) {
+ ret = LTTNG_ERR_LOAD_INVALID_CONFIG;
+ goto end;
+ }
+
+ ret = lttng_track_pid(handle, (int) pid);
+ if (ret) {
+ goto end;
+ }
+ }
+ }
+ node = pid_target_node;
+ }
+
+end:
+ 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;
+ xmlNodePtr channels_node = NULL;
+ xmlNodePtr trackers_node = NULL;
+ xmlNodePtr pid_tracker_node = NULL;
+ xmlNodePtr node;
+
+ 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)) {
+ struct lttng_channel channel;
+ xmlNodePtr contexts_node = NULL;
+ xmlNodePtr events_node = NULL;
+ xmlNodePtr channel_attr_node;
+
+ memset(&channel, 0, sizeof(channel));
+ lttng_channel_set_default_attr(&domain, &channel.attr);
+
+ 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;
+ }
+
+ 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;
+ }
+ }
+
+ /* get the trackers node */
+ for (node = xmlFirstElementChild(domain_node); node;
+ node = xmlNextElementSibling(node)) {
+ if (!strcmp((const char *) node->name,
+ config_element_trackers)) {
+ 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_pid_tracker)) {
+ pid_tracker_node = node;
+ ret = process_pid_tracker_node(pid_tracker_node, handle);
+ if (ret) {
+ goto end;
+ }
+ }
+ }
+
+ if (!pid_tracker_node) {
+ lttng_track_pid(handle, -1);
+ }
+
+end:
+ lttng_destroy_handle(handle);
+ return ret;
+}
+
+static
+int process_session_node(xmlNodePtr session_node, const char *session_name,
+ int override)
+{
+ int ret, started = -1, snapshot_mode = -1;
+ uint64_t live_timer_interval = UINT64_MAX;
+ xmlChar *name = NULL;
+ xmlChar *shm_path = NULL;
+ xmlNodePtr domains_node = NULL;
+ xmlNodePtr output_node = NULL;
+ xmlNodePtr node;
+ 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 or live_timer_interval */
+ xmlNodePtr attributes_child =
+ xmlFirstElementChild(node);
+
+ 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 {
+ /* 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;
+ }
+ }
+ }
+ }
+
+ 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;
+ }
+
+ if (override) {
+ /* 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);
+ } else if (live_timer_interval &&
+ live_timer_interval != UINT64_MAX) {
+ ret = create_session((const char *) name, kernel_domain,
+ ust_domain, jul_domain, log4j_domain,
+ output_node, live_timer_interval);
+ } else {
+ /* regular session */
+ ret = create_session((const char *) name, kernel_domain,
+ ust_domain, jul_domain, log4j_domain,
+ output_node, UINT64_MAX);
+ }
+ 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 (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;
+
+ 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 override)
+{
+ int ret, session_found = !session_name;
+ xmlDocPtr doc = NULL;
+ xmlNodePtr sessions_node;
+ xmlNodePtr session_node;
+
+ assert(path);
+ 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) {
+ goto end;
+ }
+
+ for (session_node = xmlFirstElementChild(sessions_node);
+ session_node; session_node =
+ xmlNextElementSibling(session_node)) {
+ ret = process_session_node(session_node,
+ session_name, override);
+ if (session_name && ret == 0) {
+ /* Target session found and loaded */
+ session_found = 1;
+ break;
+ }
+ }
+end:
+ xmlFreeDoc(doc);
+ if (!ret) {
+ ret = session_found ? 0 : -LTTNG_ERR_LOAD_SESSION_NOENT;
+ }
+ return ret;
+}
+
+/* Allocate dirent as recommended by READDIR(3), NOTES on readdir_r */
+static
+struct dirent *alloc_dirent(const char *path)
+{
+ size_t len;
+ long name_max;
+ struct dirent *entry;
+
+ name_max = pathconf(path, _PC_NAME_MAX);
+ if (name_max == -1) {
+ name_max = PATH_MAX;
+ }
+ len = offsetof(struct dirent, d_name) + name_max + 1;
+ entry = zmalloc(len);
+ return entry;
+}
+
+static
+int load_session_from_path(const char *path, const char *session_name,
+ struct session_config_validation_ctx *validation_ctx, int override)
+{
+ int ret, session_found = !session_name;
+ DIR *directory = NULL;
+
+ assert(path);
+ assert(validation_ctx);
+
+ 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) {
+ struct dirent *entry;
+ struct dirent *result;
+ char *file_path = NULL;
+ size_t path_len = strlen(path);
+
+ if (path_len >= PATH_MAX) {
+ ret = -LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ entry = alloc_dirent(path);
+ if (!entry) {
+ ret = -LTTNG_ERR_NOMEM;
+ goto end;
+ }
+
+ file_path = zmalloc(PATH_MAX);
+ if (!file_path) {
+ ret = -LTTNG_ERR_NOMEM;
+ free(entry);
+ goto end;
+ }
+
+ strncpy(file_path, path, path_len);
+ if (file_path[path_len - 1] != '/') {
+ file_path[path_len++] = '/';
+ }
+
+ ret = 0;
+ /* Search for *.lttng files */
+ while (!readdir_r(directory, entry, &result) && result) {
+ size_t file_name_len = strlen(result->d_name);
+
+ if (file_name_len <=
+ sizeof(DEFAULT_SESSION_CONFIG_FILE_EXTENSION)) {
+ continue;
+ }
+
+ if (path_len + file_name_len >= PATH_MAX) {
+ continue;
+ }
+
+ if (strcmp(DEFAULT_SESSION_CONFIG_FILE_EXTENSION,
+ result->d_name + file_name_len - sizeof(
+ DEFAULT_SESSION_CONFIG_FILE_EXTENSION) + 1)) {
+ continue;
+ }
+
+ strncpy(file_path + path_len, result->d_name, file_name_len);
+ file_path[path_len + file_name_len] = '\0';
+
+ ret = load_session_from_file(file_path, session_name,
+ validation_ctx, override);
+ if (session_name && !ret) {
+ session_found = 1;
+ break;
+ }
+ }
+
+ free(entry);
+ free(file_path);
+ } else {
+ ret = load_session_from_file(path, session_name,
+ validation_ctx, override);
+ if (ret) {
+ goto end;
+ } else {
+ session_found = 1;
+ }
+ }
+
+end:
+ if (directory) {
+ if (closedir(directory)) {
+ PERROR("closedir");
+ }
+ }
+
+ if (!session_found) {
+ ret = -LTTNG_ERR_LOAD_SESSION_NOENT;
+ }
+
+ 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;
+
+ assert(path);
+
+ if (uid == 0) {
+ goto valid;
+ }
+
+ ret = stat(path, &buf);
+ if (ret < 0) {
+ if (errno != ENOENT) {
+ PERROR("stat");
+ }
+ ret = -LTTNG_ERR_INVALID;
+ goto valid;
+ }
+
+ if (buf.st_uid != uid) {
+ goto invalid;
+ }
+
+valid:
+ return 1;
+invalid:
+ return 0;
+}
+
+LTTNG_HIDDEN
+int config_load_session(const char *path, const char *session_name,
+ int override, unsigned int autoload)
+{
+ int ret;
+ 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) {
+ char *home_path;
+ const char *sys_path;
+
+ /* Try home path */
+ home_path = utils_get_home_dir();
+ if (home_path) {
+ char path[PATH_MAX];
+
+ /*
+ * Try user session configuration path. Ignore error here so we can
+ * continue loading the system wide sessions.
+ */
+ if (autoload) {
+ ret = snprintf(path, sizeof(path),
+ DEFAULT_SESSION_HOME_CONFIGPATH "/"
+ DEFAULT_SESSION_CONFIG_AUTOLOAD, home_path);
+ if (ret < 0) {
+ PERROR("snprintf session autoload home config path");
+ 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);
+ if (ret) {
+ path_ptr = path;
+ }
+ } else {
+ ret = snprintf(path, sizeof(path),
+ DEFAULT_SESSION_HOME_CONFIGPATH, home_path);
+ if (ret < 0) {
+ PERROR("snprintf session home config path");
+ goto end;
+ }
+ path_ptr = path;
+ }
+ if (path_ptr) {
+ ret = load_session_from_path(path_ptr, session_name,
+ &validation_ctx, override);
+ 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.
+ */
+ }
+ }
+
+ /* 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, override);
+ }
+ } 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, override);
+ }
+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;
+ }
+ return ret;
+}
projects / lttng-tools.git / commitdiff
