--- /dev/null
+#include <stdio.h>
+#include <ctype.h>
+
+#include "../command.h"
+#include "../uprobe.h"
+
+#include "common/argpar/argpar.h"
+#include "common/dynamic-array.h"
+#include "common/string-utils/string-utils.h"
+#include "common/utils.h"
+#include "lttng/condition/event-rule.h"
+#include "lttng/event-internal.h"
+#include "lttng/event-expr.h"
+#include <lttng/event-rule/event-rule-internal.h>
+#include "lttng/event-rule/kprobe.h"
+#include "lttng/event-rule/syscall.h"
+#include <lttng/event-rule/tracepoint.h>
+#include "lttng/event-rule/uprobe.h"
+#include "lttng/kernel-probe.h"
+#include "common/filter/filter-ast.h"
+#include "common/filter/filter-ir.h"
+#include "common/dynamic-array.h"
+
+
+#if (LTTNG_SYMBOL_NAME_LEN == 256)
+#define LTTNG_SYMBOL_NAME_LEN_SCANF_IS_A_BROKEN_API "255"
+#endif
+
+#ifdef LTTNG_EMBED_HELP
+static const char help_msg[] =
+#include <lttng-add-trigger.1.h>
+;
+#endif
+
+enum {
+ OPT_HELP,
+ OPT_LIST_OPTIONS,
+
+ OPT_CONDITION,
+ OPT_ACTION,
+ OPT_ID,
+ OPT_FIRE_ONCE_AFTER,
+ OPT_FIRE_EVERY,
+ OPT_USER_ID,
+
+ OPT_ALL,
+ OPT_FILTER,
+ OPT_EXCLUDE,
+ OPT_LOGLEVEL,
+ OPT_LOGLEVEL_ONLY,
+
+ OPT_USERSPACE,
+ OPT_KERNEL,
+ OPT_LOG4J,
+ OPT_JUL,
+ OPT_PYTHON,
+
+ OPT_FUNCTION,
+ OPT_PROBE,
+ OPT_USERSPACE_PROBE,
+ OPT_SYSCALL,
+ OPT_TRACEPOINT,
+
+ OPT_NAME,
+ OPT_MAX_SIZE,
+ OPT_DATA_URL,
+ OPT_CTRL_URL,
+
+ OPT_CAPTURE,
+};
+
+static const struct argpar_opt_descr event_rule_opt_descrs[] = {
+ { OPT_ALL, 'a', "all", false },
+ { OPT_FILTER, 'f', "filter", true },
+ { OPT_EXCLUDE, 'x', "exclude", true },
+ { OPT_LOGLEVEL, '\0', "loglevel", true },
+ { OPT_LOGLEVEL_ONLY, '\0', "loglevel-only", true },
+
+ /* Domains */
+ { OPT_USERSPACE, 'u', "userspace", false },
+ { OPT_KERNEL, 'k', "kernel", false },
+ { OPT_LOG4J, 'l', "log4j", false },
+ { OPT_JUL, 'j', "jul", false },
+ { OPT_PYTHON, 'p', "python", false },
+
+ /* Event rule types */
+ { OPT_FUNCTION, '\0', "function", true },
+ { OPT_PROBE, '\0', "probe", true },
+ { OPT_USERSPACE_PROBE, '\0', "userspace-probe", true },
+ { OPT_SYSCALL, '\0', "syscall" },
+ { OPT_TRACEPOINT, '\0', "tracepoint" },
+
+ /* Capture descriptor */
+ { OPT_CAPTURE, '\0', "capture", true },
+
+ ARGPAR_OPT_DESCR_SENTINEL
+};
+
+static
+bool assign_domain_type(enum lttng_domain_type *dest,
+ enum lttng_domain_type src)
+{
+ bool ret;
+
+ if (*dest == LTTNG_DOMAIN_NONE || *dest == src) {
+ *dest = src;
+ ret = true;
+ } else {
+ ERR("Multiple domains specified.");
+ ret = false;
+ }
+
+ return ret;
+}
+
+static
+bool assign_event_rule_type(enum lttng_event_rule_type *dest,
+ enum lttng_event_rule_type src)
+{
+ bool ret;
+
+ if (*dest == LTTNG_EVENT_RULE_TYPE_UNKNOWN || *dest == src) {
+ *dest = src;
+ ret = true;
+ } else {
+ ERR("Multiple event type not supported.");
+ ret = false;
+ }
+
+ return ret;
+}
+
+static
+bool assign_string(char **dest, const char *src, const char *opt_name)
+{
+ bool ret;
+
+ if (*dest) {
+ ERR(
+ "Duplicate %s given.", opt_name);
+ goto error;
+ }
+
+ *dest = strdup(src);
+ if (!*dest) {
+ ERR("Failed to allocate %s string.", opt_name);
+ goto error;
+ }
+
+ ret = true;
+ goto end;
+
+error:
+ ret = false;
+
+end:
+ return ret;
+}
+
+/* This is defined in enable_events.c. */
+LTTNG_HIDDEN
+int create_exclusion_list_and_validate(const char *event_name,
+ const char *exclusions_arg,
+ char ***exclusion_list);
+
+/*
+ * Parse `str` as a log level in domain `domain_type`. Return -1 if the string
+ * is not recognized as a valid log level.
+ */
+static
+int parse_loglevel_string(const char *str, enum lttng_domain_type domain_type)
+{
+
+ switch (domain_type) {
+ case LTTNG_DOMAIN_UST:
+ return loglevel_str_to_value(str);
+
+ case LTTNG_DOMAIN_LOG4J:
+ return loglevel_log4j_str_to_value(str);
+
+ case LTTNG_DOMAIN_JUL:
+ return loglevel_jul_str_to_value(str);
+
+ case LTTNG_DOMAIN_PYTHON:
+ return loglevel_python_str_to_value(str);
+
+ default:
+ /* Invalid domain type. */
+ abort();
+ }
+}
+
+static int parse_kernel_probe_opts(const char *source,
+ struct lttng_kernel_probe_location **location)
+{
+ int ret = 0;
+ int match;
+ char s_hex[19];
+ char name[LTTNG_SYMBOL_NAME_LEN];
+ char *symbol_name = NULL;
+ uint64_t offset;
+
+ /* Check for symbol+offset */
+ match = sscanf(source, "%255[^'+']+%18s", name, s_hex);
+ if (match == 2) {
+ if (*s_hex == '\0') {
+ ERR("Kernel probe symbol offset is missing.");
+ goto error;
+ }
+ symbol_name = strndup(name, LTTNG_SYMBOL_NAME_LEN);
+ if (!symbol_name) {
+ ERR("Strndup kernel probe location symbol name.");
+ goto error;
+ }
+ offset = strtoul(s_hex, NULL, 0);
+
+ *location = lttng_kernel_probe_location_symbol_create(
+ symbol_name, offset);
+ if (!location) {
+ ERR("Symbol kernel probe location creation failed.");
+ goto error;
+ }
+
+ goto end;
+ }
+
+ /* Check for symbol */
+ if (isalpha(name[0]) || name[0] == '_') {
+ match = sscanf(source,
+ "%" LTTNG_SYMBOL_NAME_LEN_SCANF_IS_A_BROKEN_API
+ "s",
+ name);
+ if (match == 1) {
+ symbol_name = strndup(name, LTTNG_SYMBOL_NAME_LEN);
+ if (!symbol_name) {
+ ERR("Strndup kernel probe location symbol name.");
+ goto error;
+ }
+
+ *location = lttng_kernel_probe_location_symbol_create(
+ symbol_name, 0);
+ if (!location) {
+ ERR("Symbol kernel probe location creation failed.");
+ goto error;
+ }
+
+ goto end;
+ }
+ }
+
+ /* Check for address */
+ match = sscanf(source, "%18s", s_hex);
+ if (match > 0) {
+ uint64_t address;
+ if (*s_hex == '\0') {
+ ERR("Invalid kernel probe location address.");
+ goto error;
+ }
+ address = strtoul(s_hex, NULL, 0);
+ *location = lttng_kernel_probe_location_address_create(address);
+ if (!location) {
+ ERR("Symbol kernel probe location creation failed.");
+ goto error;
+ }
+
+ goto end;
+ }
+
+error:
+ /* No match */
+ ret = -1;
+ *location = NULL;
+
+end:
+ free(symbol_name);
+ return ret;
+}
+
+static
+struct lttng_event_expr *ir_op_load_expr_to_event_expr(
+ struct ir_load_expression *load_exp, const char *capture_str)
+{
+ struct ir_load_expression_op *load_expr_op = load_exp->child;
+ struct lttng_event_expr *event_expr = NULL;
+ char *provider_name = NULL;
+
+ switch (load_expr_op->type) {
+ case IR_LOAD_EXPRESSION_GET_PAYLOAD_ROOT:
+ {
+ const char *field_name;
+
+ load_expr_op = load_expr_op->next;
+ assert(load_expr_op);
+ assert(load_expr_op->type == IR_LOAD_EXPRESSION_GET_SYMBOL);
+ field_name = load_expr_op->u.symbol;
+ assert(field_name);
+
+ event_expr = lttng_event_expr_event_payload_field_create(field_name);
+ if (!event_expr) {
+ fprintf(stderr, "Failed to create payload field event expression.\n");
+ goto error;
+ }
+
+ break;
+ }
+
+ case IR_LOAD_EXPRESSION_GET_CONTEXT_ROOT:
+ {
+ const char *field_name;
+
+ load_expr_op = load_expr_op->next;
+ assert(load_expr_op);
+ assert(load_expr_op->type == IR_LOAD_EXPRESSION_GET_SYMBOL);
+ field_name = load_expr_op->u.symbol;
+ assert(field_name);
+
+ event_expr = lttng_event_expr_channel_context_field_create(field_name);
+ if (!event_expr) {
+ fprintf(stderr, "Failed to create channel context field event expression.\n");
+ goto error;
+ }
+
+ break;
+ }
+
+ case IR_LOAD_EXPRESSION_GET_APP_CONTEXT_ROOT:
+ {
+ const char *field_name;
+ const char *colon;
+ const char *type_name;
+
+ load_expr_op = load_expr_op->next;
+ assert(load_expr_op);
+ assert(load_expr_op->type == IR_LOAD_EXPRESSION_GET_SYMBOL);
+ field_name = load_expr_op->u.symbol;
+ assert(field_name);
+
+ /*
+ * The field name needs to be of the form PROVIDER:TYPE. We
+ * split it here.
+ */
+ colon = strchr(field_name, ':');
+ if (!colon) {
+ fprintf(stderr, "Invalid app-specific context field name: missing colon in `%s`.\n",
+ field_name);
+ goto error;
+ }
+
+ type_name = colon + 1;
+ if (*type_name == '\0') {
+ fprintf(stderr,
+ "Invalid app-specific context field name: missing type name after colon in `%s`.\n",
+ field_name);
+ goto error;
+ }
+
+ provider_name = strndup(field_name, colon - field_name);
+ if (!provider_name) {
+ fprintf(stderr, "Failed to allocate string.\n");
+ goto error;
+ }
+
+ event_expr = lttng_event_expr_app_specific_context_field_create(
+ provider_name, type_name);
+ if (!event_expr) {
+ fprintf(stderr,
+ "Failed to create app-specific context field event expression.\n");
+ goto error;
+ }
+
+ break;
+ }
+
+ default:
+ fprintf(stderr, "%s: unexpected load expr type %d.\n",
+ __func__, load_expr_op->type);
+ abort();
+ }
+
+ load_expr_op = load_expr_op->next;
+
+ /* There may be a single array index after that. */
+ if (load_expr_op->type == IR_LOAD_EXPRESSION_GET_INDEX) {
+ uint64_t index = load_expr_op->u.index;
+ struct lttng_event_expr *index_event_expr;
+
+ index_event_expr = lttng_event_expr_array_field_element_create(event_expr, index);
+ if (!index_event_expr) {
+ fprintf(stderr, "Failed to create array field element event expression.\n");
+ goto error;
+ }
+
+ event_expr = index_event_expr;
+ load_expr_op = load_expr_op->next;
+ }
+
+ switch (load_expr_op->type) {
+ case IR_LOAD_EXPRESSION_LOAD_FIELD:
+ /*
+ * This is what we expect, IR_LOAD_EXPRESSION_LOAD_FIELD is
+ * always found at the end of the chain.
+ */
+ break;
+ case IR_LOAD_EXPRESSION_GET_SYMBOL:
+ fprintf(stderr, "Error: While parsing expression `%s`: Capturing subfields is not supported.\n",
+ capture_str);
+ goto error;
+
+ default:
+ fprintf(stderr, "%s: unexpected load expression operator %s.\n",
+ __func__, ir_load_expression_type_str(load_expr_op->type));
+ abort();
+ }
+
+ goto end;
+
+error:
+ lttng_event_expr_destroy(event_expr);
+ event_expr = NULL;
+
+end:
+ free(provider_name);
+
+ return event_expr;
+}
+
+static
+struct lttng_event_expr *ir_op_load_to_event_expr(struct ir_op *ir,
+ const char *capture_str)
+{
+ struct lttng_event_expr *event_expr = NULL;
+
+ assert(ir->op == IR_OP_LOAD);
+
+ switch (ir->data_type) {
+ case IR_DATA_EXPRESSION:
+ {
+ struct ir_load_expression *ir_load_expr = ir->u.load.u.expression;
+ event_expr = ir_op_load_expr_to_event_expr(ir_load_expr, capture_str);
+ break;
+ }
+
+ default:
+ fprintf(stderr, "%s: unexpected data type: %s.\n", __func__,
+ ir_data_type_str(ir->data_type));
+ abort();
+ }
+
+ return event_expr;
+}
+
+static
+struct lttng_event_expr *ir_op_root_to_event_expr(struct ir_op *ir,
+ const char *capture_str)
+{
+ struct lttng_event_expr *event_expr = NULL;
+
+ assert(ir->op == IR_OP_ROOT);
+ ir = ir->u.root.child;
+
+ switch (ir->op) {
+ case IR_OP_LOAD:
+ event_expr = ir_op_load_to_event_expr(ir, capture_str);
+ break;
+
+ case IR_OP_BINARY:
+ fprintf(stderr, "Error: While parsing expression `%s`: Binary operators are not allowed in capture expressions.\n",
+ capture_str);
+ break;
+
+ case IR_OP_UNARY:
+ fprintf(stderr, "Error: While parsing expression `%s`: Unary operators are not allowed in capture expressions.\n",
+ capture_str);
+ break;
+
+ case IR_OP_LOGICAL:
+ fprintf(stderr, "Error: While parsing expression `%s`: Logical operators are not allowed in capture expressions.\n",
+ capture_str);
+ break;
+
+ default:
+ fprintf(stderr, "%s: unexpected IR op type: %s.\n", __func__,
+ ir_op_type_str(ir->op));
+ abort();
+ }
+
+ return event_expr;
+}
+
+static
+void destroy_event_expr(void *ptr)
+{
+ lttng_event_expr_destroy(ptr);
+}
+
+struct parse_event_rule_res {
+ /* Owned by this */
+ struct lttng_event_rule *er;
+
+ /* Array of `struct lttng_event_expr *` */
+ struct lttng_dynamic_pointer_array capture_descriptors;
+};
+
+static
+struct parse_event_rule_res parse_event_rule(int *argc, const char ***argv)
+{
+ enum lttng_domain_type domain_type = LTTNG_DOMAIN_NONE;
+ enum lttng_event_rule_type event_rule_type = LTTNG_EVENT_RULE_TYPE_UNKNOWN;
+ struct argpar_state *state;
+ struct argpar_item *item = NULL;
+ char *error = NULL;
+ int consumed_args = -1;
+ struct lttng_kernel_probe_location *kernel_probe_location = NULL;
+ struct lttng_userspace_probe_location *userspace_probe_location = NULL;
+ struct parse_event_rule_res res = { 0 };
+ struct lttng_event_expr *event_expr = NULL;
+ struct filter_parser_ctx *parser_ctx = NULL;
+
+ /* Was the -a/--all flag provided? */
+ bool all_events = false;
+
+ /* Tracepoint name (non-option argument) */
+ const char *tracepoint_name = NULL;
+
+ /* Holds the argument of --probe / --userspace-probe. */
+ char *source = NULL;
+
+ /* Filter */
+ char *filter = NULL;
+
+ /* Exclude */
+ char *exclude = NULL;
+ char **exclusion_list = NULL;
+
+ /* Log level */
+ char *loglevel_str = NULL;
+ bool loglevel_only = false;
+
+ lttng_dynamic_pointer_array_init(&res.capture_descriptors,
+ destroy_event_expr);
+ state = argpar_state_create(*argc, *argv, event_rule_opt_descrs);
+ if (!state) {
+ ERR("Failed to allocate an argpar state.");
+ goto error;
+ }
+
+ while (true) {
+ enum argpar_state_parse_next_status status;
+
+ ARGPAR_ITEM_DESTROY_AND_RESET(item);
+ status = argpar_state_parse_next(state, &item, &error);
+ if (status == ARGPAR_STATE_PARSE_NEXT_STATUS_ERROR) {
+ ERR("%s", error);
+ goto error;
+ } else if (status == ARGPAR_STATE_PARSE_NEXT_STATUS_ERROR_UNKNOWN_OPT) {
+ /* Just stop parsing here. */
+ break;
+ } else if (status == ARGPAR_STATE_PARSE_NEXT_STATUS_END) {
+ break;
+ }
+
+ assert(status == ARGPAR_STATE_PARSE_NEXT_STATUS_OK);
+
+ if (item->type == ARGPAR_ITEM_TYPE_OPT) {
+ struct argpar_item_opt *item_opt =
+ (struct argpar_item_opt *) item;
+
+ switch (item_opt->descr->id) {
+ /* Domains */
+ case OPT_USERSPACE:
+ if (!assign_domain_type(&domain_type, LTTNG_DOMAIN_UST)) {
+ goto error;
+ }
+ break;
+
+ case OPT_KERNEL:
+ if (!assign_domain_type(&domain_type, LTTNG_DOMAIN_KERNEL)) {
+ goto error;
+ }
+ break;
+
+ case OPT_LOG4J:
+ if (!assign_domain_type(&domain_type, LTTNG_DOMAIN_LOG4J)) {
+ goto error;
+ }
+ break;
+
+ case OPT_JUL:
+ if (!assign_domain_type(&domain_type, LTTNG_DOMAIN_JUL)) {
+ goto error;
+ }
+ break;
+
+ case OPT_PYTHON:
+ if (!assign_domain_type(&domain_type, LTTNG_DOMAIN_PYTHON)) {
+ goto error;
+ }
+ break;
+
+ /* Event rule types */
+ case OPT_FUNCTION:
+ if (!assign_event_rule_type(&event_rule_type,
+ LTTNG_EVENT_RULE_TYPE_KRETPROBE)) {
+ goto error;
+ }
+ break;
+
+ case OPT_PROBE:
+ if (!assign_event_rule_type(&event_rule_type,
+ LTTNG_EVENT_RULE_TYPE_KPROBE)) {
+ goto error;
+ }
+
+ if (!assign_string(&source, item_opt->arg, "source")) {
+ goto error;
+ }
+
+ break;
+
+ case OPT_USERSPACE_PROBE:
+ if (!assign_event_rule_type(&event_rule_type,
+ LTTNG_EVENT_RULE_TYPE_UPROBE)) {
+ goto error;
+ }
+
+ if (!assign_string(&source, item_opt->arg, "source")) {
+ goto error;
+ }
+ break;
+
+ case OPT_SYSCALL:
+ if (!assign_event_rule_type(&event_rule_type,
+ LTTNG_EVENT_RULE_TYPE_SYSCALL)) {
+ goto error;
+ }
+ break;
+
+ case OPT_TRACEPOINT:
+ if (!assign_event_rule_type(&event_rule_type,
+ LTTNG_EVENT_RULE_TYPE_TRACEPOINT)) {
+ goto error;
+ }
+ break;
+
+ case OPT_ALL:
+ all_events = true;
+ break;
+
+ case OPT_FILTER:
+ if (!assign_string(&filter, item_opt->arg, "--filter/-f")) {
+ goto error;
+ }
+ break;
+
+ case OPT_EXCLUDE:
+ if (!assign_string(&exclude, item_opt->arg, "--exclude/-x")) {
+ goto error;
+ }
+ break;
+
+ case OPT_LOGLEVEL:
+ case OPT_LOGLEVEL_ONLY:
+ if (!assign_string(&loglevel_str, item_opt->arg, "--loglevel/--loglevel-only")) {
+ goto error;
+ }
+
+ loglevel_only = item_opt->descr->id == OPT_LOGLEVEL_ONLY;
+ break;
+
+ case OPT_CAPTURE:
+ {
+ const char *capture_str = item_opt->arg;
+ int ret;
+
+ ret = filter_parser_ctx_create_from_filter_expression(
+ capture_str, &parser_ctx);
+ if (ret) {
+ fprintf(stderr, "Failed to parse capture expression `%s`.\n", capture_str);
+ goto error;
+ }
+
+ event_expr = ir_op_root_to_event_expr(parser_ctx->ir_root,
+ capture_str);
+ if (!event_expr) {
+ /* ir_op_root_to_event_expr has printed an error message. */
+ goto error;
+ }
+
+ ret = lttng_dynamic_pointer_array_add_pointer(
+ &res.capture_descriptors,
+ event_expr);
+ if (ret) {
+ goto error;
+ }
+
+ /* The ownership of event expression was transferred to the dynamic array. */
+ event_expr = NULL;
+
+ break;
+ }
+
+ default:
+ abort();
+ }
+ } else {
+ struct argpar_item_non_opt *item_non_opt =
+ (struct argpar_item_non_opt *) item;
+
+ /*
+ * Don't accept two non-option arguments/tracepoint
+ * names.
+ */
+ if (tracepoint_name) {
+ ERR(
+ "Unexpected argument: %s",
+ item_non_opt->arg);
+ goto error;
+ }
+
+ tracepoint_name = item_non_opt->arg;
+ }
+ }
+
+ if (event_rule_type == LTTNG_EVENT_RULE_TYPE_UNKNOWN) {
+ event_rule_type = LTTNG_EVENT_RULE_TYPE_TRACEPOINT;
+ }
+
+ /*
+ * Option -a is applicable to event rules of type tracepoint and
+ * syscall, and it is equivalent to using "*" as the tracepoint name.
+ */
+ if (all_events) {
+ switch (event_rule_type) {
+ case LTTNG_EVENT_RULE_TYPE_TRACEPOINT:
+ case LTTNG_EVENT_RULE_TYPE_SYSCALL:
+ break;
+ default:
+ ERR("Can't use -a/--all with event rule of type %s.",
+ lttng_event_rule_type_str(event_rule_type));
+ goto error;
+ }
+
+ if (tracepoint_name) {
+ ERR("Can't provide a tracepoint name with -a/--all.");
+ goto error;
+ }
+
+ /* In which case, it's equivalent to tracepoint name "*". */
+ tracepoint_name = "*";
+ }
+
+ /*
+ * A tracepoint name (or -a, for the event rule types that accept it)
+ * is required.
+ */
+ if (!tracepoint_name) {
+ ERR("Need to provide either a tracepoint name or -a/--all.");
+ goto error;
+ }
+
+ /*
+ * We don't support multiple tracepoint names for now.
+ */
+ if (strchr(tracepoint_name, ',')) {
+ ERR("multiple tracepoint names are not supported at the moment.");
+ goto error;
+ }
+
+ /*
+ * Update *argc and *argv so our caller can keep parsing what follows.
+ */
+ consumed_args = argpar_state_get_ingested_orig_args(state);
+ assert(consumed_args >= 0);
+ *argc -= consumed_args;
+ *argv += consumed_args;
+
+ /* Need to specify a domain. */
+ if (domain_type == LTTNG_DOMAIN_NONE) {
+ ERR("Please specify a domain (-k/-u/-j).");
+ goto error;
+ }
+
+ /* Validate event rule type against domain. */
+ switch (event_rule_type) {
+ case LTTNG_EVENT_RULE_TYPE_KPROBE:
+ case LTTNG_EVENT_RULE_TYPE_KRETPROBE:
+ case LTTNG_EVENT_RULE_TYPE_UPROBE:
+ case LTTNG_EVENT_RULE_TYPE_SYSCALL:
+ if (domain_type != LTTNG_DOMAIN_KERNEL) {
+ ERR("Event type not available for user-space tracing");
+ goto error;
+ }
+ break;
+
+ case LTTNG_EVENT_RULE_TYPE_TRACEPOINT:
+ break;
+
+ default:
+ abort();
+ }
+
+ /*
+ * Adding a filter to a probe, function or userspace-probe would be
+ * denied by the kernel tracer as it's not supported at the moment. We
+ * do an early check here to warn the user.
+ */
+ if (filter && domain_type == LTTNG_DOMAIN_KERNEL) {
+ switch (event_rule_type) {
+ case LTTNG_EVENT_RULE_TYPE_TRACEPOINT:
+ case LTTNG_EVENT_RULE_TYPE_SYSCALL:
+ break;
+ default:
+ ERR("Filter expressions are not supported for %s events",
+ lttng_event_rule_type_str(event_rule_type));
+ goto error;
+ }
+ }
+
+ /* If --exclude/-x was passed, split it into an exclusion list. */
+ if (exclude) {
+ if (domain_type != LTTNG_DOMAIN_UST) {
+ ERR("Event name exclusions are not yet implemented for %s events",
+ get_domain_str(domain_type));
+ goto error;
+ }
+
+
+ if (create_exclusion_list_and_validate(tracepoint_name, exclude,
+ &exclusion_list) != 0) {
+ ERR("Failed to create exclusion list.");
+ goto error;
+ }
+ }
+
+ if (loglevel_str && event_rule_type != LTTNG_EVENT_RULE_TYPE_TRACEPOINT) {
+ ERR("Log levels are only application to tracepoint event rules.");
+ goto error;
+ }
+
+ /* Finally, create the event rule object. */
+ switch (event_rule_type) {
+ case LTTNG_EVENT_RULE_TYPE_TRACEPOINT:
+ {
+ enum lttng_event_rule_status event_rule_status;
+
+ res.er = lttng_event_rule_tracepoint_create(domain_type);
+ if (!res.er) {
+ ERR("Failed to create tracepoint event rule.");
+ goto error;
+ }
+
+ /* Set pattern. */
+ event_rule_status =
+ lttng_event_rule_tracepoint_set_pattern(res.er, tracepoint_name);
+ if (event_rule_status != LTTNG_EVENT_RULE_STATUS_OK) {
+ ERR("Failed to set tracepoint pattern.");
+ goto error;
+ }
+
+ /* Set filter. */
+ if (filter) {
+ event_rule_status =
+ lttng_event_rule_tracepoint_set_filter(
+ res.er, filter);
+ if (event_rule_status != LTTNG_EVENT_RULE_STATUS_OK) {
+ ERR("Failed to set tracepoint filter expression.");
+ goto error;
+ }
+ }
+
+ /* Set exclusion list. */
+ if (exclusion_list) {
+ int n;
+
+ for (n = 0; exclusion_list[n]; n++) {
+ event_rule_status = lttng_event_rule_tracepoint_add_exclusion(
+ res.er,
+ exclusion_list[n]);
+ if (event_rule_status !=
+ LTTNG_EVENT_RULE_STATUS_OK) {
+ ERR("Failed to set tracepoint exclusion list.");
+ goto error;
+ }
+ }
+ }
+
+ if (loglevel_str) {
+ int loglevel;
+
+ if (domain_type == LTTNG_DOMAIN_KERNEL) {
+ ERR("Log levels are not supported by the kernel tracer.");
+ goto error;
+ }
+
+ loglevel = parse_loglevel_string(
+ loglevel_str, domain_type);
+ if (loglevel < 0) {
+ ERR("Failed to parse `%s` as a log level.", loglevel_str);
+ goto error;
+ }
+
+ if (loglevel_only) {
+ event_rule_status =
+ lttng_event_rule_tracepoint_set_log_level(
+ res.er, loglevel);
+ } else {
+ event_rule_status =
+ lttng_event_rule_tracepoint_set_log_level_range_lower_bound(
+ res.er, loglevel);
+ }
+
+ if (event_rule_status != LTTNG_EVENT_RULE_STATUS_OK) {
+ ERR("Failed to set log level.");
+ goto error;
+ }
+ }
+
+ break;
+ }
+
+ case LTTNG_EVENT_RULE_TYPE_KPROBE:
+ {
+ int ret;
+ enum lttng_event_rule_status event_rule_status;
+
+ res.er = lttng_event_rule_kprobe_create();
+ if (!res.er) {
+ ERR("Failed to create kprobe event rule.");
+ goto error;
+ }
+
+ ret = parse_kernel_probe_opts(source, &kernel_probe_location);
+ if (ret) {
+ ERR("Failed to parse kernel probe location.");
+ goto error;
+ }
+
+ event_rule_status = lttng_event_rule_kprobe_set_name(res.er, tracepoint_name);
+ if (event_rule_status != LTTNG_EVENT_RULE_STATUS_OK) {
+ ERR("Failed to set kprobe event rule's name.");
+ goto error;
+ }
+
+ assert(kernel_probe_location);
+ event_rule_status = lttng_event_rule_kprobe_set_location(res.er, kernel_probe_location);
+ if (event_rule_status != LTTNG_EVENT_RULE_STATUS_OK) {
+ ERR("Failed to set kprobe event rule's location.");
+ goto error;
+ }
+
+ break;
+ }
+
+ case LTTNG_EVENT_RULE_TYPE_UPROBE:
+ {
+ int ret;
+ enum lttng_event_rule_status event_rule_status;
+
+ ret = parse_userspace_probe_opts(source, &userspace_probe_location);
+ if (ret) {
+ ERR("Failed to parse userspace probe location.");
+ goto error;
+ }
+
+ res.er = lttng_event_rule_uprobe_create();
+ if (!res.er) {
+ ERR("Failed to create userspace probe event rule.");
+ goto error;
+ }
+
+ event_rule_status = lttng_event_rule_uprobe_set_location(res.er, userspace_probe_location);
+ if (event_rule_status != LTTNG_EVENT_RULE_STATUS_OK) {
+ ERR("Failed to set userspace probe event rule's location.");
+ goto error;
+ }
+
+ event_rule_status = lttng_event_rule_uprobe_set_name(res.er, tracepoint_name);
+ if (event_rule_status != LTTNG_EVENT_RULE_STATUS_OK) {
+ ERR("Failed to set userspace probe event rule's name.");
+ goto error;
+ }
+
+ break;
+ }
+
+ case LTTNG_EVENT_RULE_TYPE_SYSCALL:
+ {
+ enum lttng_event_rule_status event_rule_status;
+
+ res.er = lttng_event_rule_syscall_create();
+ if (!res.er) {
+ ERR("Failed to create syscall event rule.");
+ goto error;
+ }
+
+ event_rule_status = lttng_event_rule_syscall_set_pattern(res.er, tracepoint_name);
+ if (event_rule_status != LTTNG_EVENT_RULE_STATUS_OK) {
+ ERR("Failed to set syscall event rule's pattern.");
+ goto error;
+ }
+
+ if (filter) {
+ event_rule_status = lttng_event_rule_syscall_set_filter(
+ res.er, filter);
+ if (event_rule_status != LTTNG_EVENT_RULE_STATUS_OK) {
+ ERR("Failed to set syscall event rule's filter expression.");
+ goto error;
+ }
+ }
+
+ break;
+ }
+
+ default:
+ ERR("%s: I don't support event rules of type `%s` at the moment.", __func__,
+ lttng_event_rule_type_str(event_rule_type));
+ goto error;
+ }
+
+ goto end;
+
+error:
+ lttng_event_rule_destroy(res.er);
+ res.er = NULL;
+ lttng_dynamic_pointer_array_reset(&res.capture_descriptors);
+
+end:
+ if (parser_ctx) {
+ filter_parser_ctx_free(parser_ctx);
+ }
+
+ lttng_event_expr_destroy(event_expr);
+ argpar_item_destroy(item);
+ free(error);
+ argpar_state_destroy(state);
+ free(filter);
+ free(exclude);
+ free(loglevel_str);
+ strutils_free_null_terminated_array_of_strings(exclusion_list);
+ lttng_kernel_probe_location_destroy(kernel_probe_location);
+ lttng_userspace_probe_location_destroy(userspace_probe_location);
+ return res;
+}
+
+static
+struct lttng_condition *handle_condition_event(int *argc, const char ***argv)
+{
+ struct parse_event_rule_res res;
+ struct lttng_condition *c;
+ size_t i;
+
+ res = parse_event_rule(argc, argv);
+ if (!res.er) {
+ c = NULL;
+ goto error;
+ }
+
+ c = lttng_condition_event_rule_create(res.er);
+ if (!c) {
+ goto error;
+ }
+
+ for (i = 0; i < lttng_dynamic_pointer_array_get_count(&res.capture_descriptors);
+ i++) {
+ enum lttng_condition_status status;
+ struct lttng_event_expr **expr =
+ lttng_dynamic_array_get_element(
+ &res.capture_descriptors.array, i);
+
+ assert(expr);
+ assert(*expr);
+ status = lttng_condition_event_rule_append_capture_descriptor(
+ c, *expr);
+ if (status != LTTNG_CONDITION_STATUS_OK) {
+ if (status == LTTNG_CONDITION_STATUS_UNSUPPORTED) {
+ ERR("The capture feature is unsupported by the event-rule type");
+ }
+ goto error;
+ }
+
+ /* Ownership of event expression moved to `c` */
+ *expr = NULL;
+ }
+
+ goto end;
+
+error:
+ lttng_condition_destroy(c);
+ c = NULL;
+
+end:
+ lttng_dynamic_pointer_array_reset(&res.capture_descriptors);
+ lttng_event_rule_destroy(res.er);
+ return c;
+}
+
+static
+struct lttng_condition *handle_condition_session_consumed_size(int *argc, const char ***argv)
+{
+ struct lttng_condition *cond = NULL;
+ struct argpar_state *state = NULL;
+ struct argpar_item *item = NULL;
+ const char *threshold_arg = NULL;
+ const char *session_name_arg = NULL;
+ uint64_t threshold;
+ char *error = NULL;
+ enum lttng_condition_status condition_status;
+
+ state = argpar_state_create(*argc, *argv, event_rule_opt_descrs);
+ if (!state) {
+ ERR("Failed to allocate an argpar state.");
+ goto error;
+ }
+
+ while (true) {
+ enum argpar_state_parse_next_status status;
+
+ ARGPAR_ITEM_DESTROY_AND_RESET(item);
+ status = argpar_state_parse_next(state, &item, &error);
+ if (status == ARGPAR_STATE_PARSE_NEXT_STATUS_ERROR) {
+ ERR("%s", error);
+ goto error;
+ } else if (status == ARGPAR_STATE_PARSE_NEXT_STATUS_ERROR_UNKNOWN_OPT) {
+ /* Just stop parsing here. */
+ break;
+ } else if (status == ARGPAR_STATE_PARSE_NEXT_STATUS_END) {
+ break;
+ }
+
+ assert(status == ARGPAR_STATE_PARSE_NEXT_STATUS_OK);
+
+ if (item->type == ARGPAR_ITEM_TYPE_OPT) {
+ struct argpar_item_opt *item_opt =
+ (struct argpar_item_opt *) item;
+
+ switch (item_opt->descr->id) {
+ default:
+ abort();
+ }
+ } else {
+ struct argpar_item_non_opt *item_non_opt;
+
+ assert(item->type == ARGPAR_ITEM_TYPE_NON_OPT);
+
+ item_non_opt = (struct argpar_item_non_opt *) item;
+
+ switch (item_non_opt->non_opt_index) {
+ case 0:
+ session_name_arg = item_non_opt->arg;
+ break;
+ case 1:
+ threshold_arg = item_non_opt->arg;
+ break;
+ default:
+ ERR("Unexpected argument `%s`.",
+ item_non_opt->arg);
+ goto error;
+ }
+ }
+ }
+
+ *argc -= argpar_state_get_ingested_orig_args(state);
+ *argv += argpar_state_get_ingested_orig_args(state);
+
+ if (!session_name_arg) {
+ ERR("Missing session name argument.");
+ goto error;
+ }
+
+ if (!threshold_arg) {
+ ERR("Missing threshold argument.");
+ goto error;
+ }
+
+ if (utils_parse_size_suffix(threshold_arg, &threshold) != 0) {
+ ERR("Failed to parse `%s` as a size.", threshold_arg);
+ goto error;
+ }
+
+ cond = lttng_condition_session_consumed_size_create();
+ if (!cond) {
+ ERR("Failed to allocate a session consumed size condition.");
+ goto error;
+ }
+
+ condition_status = lttng_condition_session_consumed_size_set_session_name(
+ cond, session_name_arg);
+ if (condition_status != LTTNG_CONDITION_STATUS_OK) {
+ ERR("Failed to set session consumed size condition session name.");
+ goto error;
+ }
+
+
+ condition_status = lttng_condition_session_consumed_size_set_threshold(
+ cond, threshold);
+ if (condition_status != LTTNG_CONDITION_STATUS_OK) {
+ ERR("Failed to set session consumed size condition threshold.");
+ goto error;
+ }
+
+ goto end;
+
+error:
+ lttng_condition_destroy(cond);
+ cond = NULL;
+
+end:
+ argpar_state_destroy(state);
+ argpar_item_destroy(item);
+ free(error);
+ return cond;
+}
+
+static
+struct lttng_condition *handle_condition_buffer_usage_high(int *argc, const char ***argv)
+{
+ struct lttng_condition *cond = NULL;
+ struct argpar_state *state = NULL;
+ struct argpar_item *item = NULL;
+ const char *threshold_arg = NULL;
+ const char *session_name_arg = NULL;
+ uint64_t threshold;
+ char *error = NULL;
+ enum lttng_condition_status condition_status;
+
+ state = argpar_state_create(*argc, *argv, event_rule_opt_descrs);
+ if (!state) {
+ ERR("Failed to allocate an argpar state.");
+ goto error;
+ }
+
+ while (true) {
+ enum argpar_state_parse_next_status status;
+
+ ARGPAR_ITEM_DESTROY_AND_RESET(item);
+ status = argpar_state_parse_next(state, &item, &error);
+ if (status == ARGPAR_STATE_PARSE_NEXT_STATUS_ERROR) {
+ ERR("%s", error);
+ goto error;
+ } else if (status == ARGPAR_STATE_PARSE_NEXT_STATUS_ERROR_UNKNOWN_OPT) {
+ /* Just stop parsing here. */
+ break;
+ } else if (status == ARGPAR_STATE_PARSE_NEXT_STATUS_END) {
+ break;
+ }
+
+ assert(status == ARGPAR_STATE_PARSE_NEXT_STATUS_OK);
+
+ if (item->type == ARGPAR_ITEM_TYPE_OPT) {
+ struct argpar_item_opt *item_opt =
+ (struct argpar_item_opt *) item;
+
+ switch (item_opt->descr->id) {
+ default:
+ abort();
+ }
+ } else {
+ struct argpar_item_non_opt *item_non_opt;
+
+ assert(item->type == ARGPAR_ITEM_TYPE_NON_OPT);
+
+ item_non_opt = (struct argpar_item_non_opt *) item;
+
+ switch (item_non_opt->non_opt_index) {
+ case 0:
+ session_name_arg = item_non_opt->arg;
+ break;
+ case 1:
+ threshold_arg = item_non_opt->arg;
+ break;
+ default:
+ ERR("Unexpected argument `%s`.",
+ item_non_opt->arg);
+ goto error;
+ }
+ }
+ }
+
+ *argc -= argpar_state_get_ingested_orig_args(state);
+ *argv += argpar_state_get_ingested_orig_args(state);
+
+ if (!session_name_arg) {
+ ERR("Missing session name argument.");
+ goto error;
+ }
+
+ if (!threshold_arg) {
+ ERR("Missing threshold argument.");
+ goto error;
+ }
+
+ if (utils_parse_size_suffix(threshold_arg, &threshold) != 0) {
+ ERR("Failed to parse `%s` as a size.", threshold_arg);
+ goto error;
+ }
+
+ cond = lttng_condition_session_consumed_size_create();
+ if (!cond) {
+ ERR("Failed to allocate a session consumed size condition.");
+ goto error;
+ }
+
+ condition_status = lttng_condition_session_consumed_size_set_session_name(
+ cond, session_name_arg);
+ if (condition_status != LTTNG_CONDITION_STATUS_OK) {
+ ERR("Failed to set session consumed size condition session name.");
+ goto error;
+ }
+
+ condition_status = lttng_condition_session_consumed_size_set_threshold(
+ cond, threshold);
+ if (condition_status != LTTNG_CONDITION_STATUS_OK) {
+ ERR("Failed to set session consumed size condition threshold.");
+ goto error;
+ }
+
+ goto end;
+
+error:
+ lttng_condition_destroy(cond);
+ cond = NULL;
+
+end:
+ argpar_state_destroy(state);
+ argpar_item_destroy(item);
+ free(error);
+ return cond;
+}
+
+static
+struct lttng_condition *handle_condition_buffer_usage_low(int *argc, const char ***argv)
+{
+ return NULL;
+}
+
+static
+struct lttng_condition *handle_condition_session_rotation_ongoing(int *argc, const char ***argv)
+{
+ return NULL;
+}
+
+static
+struct lttng_condition *handle_condition_session_rotation_completed(int *argc, const char ***argv)
+{
+ return NULL;
+}
+
+struct condition_descr {
+ const char *name;
+ struct lttng_condition *(*handler) (int *argc, const char ***argv);
+};
+
+static const
+struct condition_descr condition_descrs[] = {
+ { "on-event", handle_condition_event },
+ { "on-session-consumed-size", handle_condition_session_consumed_size },
+ { "on-buffer-usage-high", handle_condition_buffer_usage_high },
+ { "on-buffer-usage-low", handle_condition_buffer_usage_low },
+ { "on-session-rotation-ongoing", handle_condition_session_rotation_ongoing },
+ { "on-session-rotation-completed", handle_condition_session_rotation_completed },
+};
+
+static
+struct lttng_condition *parse_condition(int *argc, const char ***argv)
+{
+ int i;
+ struct lttng_condition *cond;
+ const char *condition_name;
+ const struct condition_descr *descr = NULL;
+
+ if (*argc == 0) {
+ ERR("Missing condition name.");
+ goto error;
+ }
+
+ condition_name = (*argv)[0];
+
+ (*argc)--;
+ (*argv)++;
+
+ for (i = 0; i < ARRAY_SIZE(condition_descrs); i++) {
+ if (strcmp(condition_name, condition_descrs[i].name) == 0) {
+ descr = &condition_descrs[i];
+ break;
+ }
+ }
+
+ if (!descr) {
+ ERR("Unknown condition name: %s", condition_name);
+ goto error;
+ }
+
+ cond = descr->handler(argc, argv);
+ if (!cond) {
+ /* The handler has already printed an error message. */
+ goto error;
+ }
+
+ goto end;
+error:
+ cond = NULL;
+end:
+ return cond;
+}
+
+
+static
+struct lttng_action *handle_action_notify(int *argc, const char ***argv)
+{
+ return lttng_action_notify_create();
+}
+
+static const struct argpar_opt_descr no_opt_descrs[] = {
+ ARGPAR_OPT_DESCR_SENTINEL
+};
+
+/*
+ * Generic handler for a kind of action that takes a session name as its sole
+ * argument.
+ */
+
+static
+struct lttng_action *handle_action_simple_session(
+ int *argc, const char ***argv,
+ struct lttng_action *(*create_action_cb)(void),
+ enum lttng_action_status (*set_session_name_cb)(struct lttng_action *, const char *),
+ const char *action_name)
+{
+ struct lttng_action *action = NULL;
+ struct argpar_state *state = NULL;
+ struct argpar_item *item = NULL;
+ const char *session_name_arg = NULL;
+ char *error = NULL;
+ enum lttng_action_status action_status;
+
+ state = argpar_state_create(*argc, *argv, no_opt_descrs);
+ if (!state) {
+ ERR("Failed to allocate an argpar state.");
+ goto error;
+ }
+
+ while (true) {
+ enum argpar_state_parse_next_status status;
+ struct argpar_item_non_opt *item_non_opt;
+
+ ARGPAR_ITEM_DESTROY_AND_RESET(item);
+ status = argpar_state_parse_next(state, &item, &error);
+ if (status == ARGPAR_STATE_PARSE_NEXT_STATUS_ERROR) {
+ ERR("%s", error);
+ goto error;
+ } else if (status == ARGPAR_STATE_PARSE_NEXT_STATUS_ERROR_UNKNOWN_OPT) {
+ /* Just stop parsing here. */
+ break;
+ } else if (status == ARGPAR_STATE_PARSE_NEXT_STATUS_END) {
+ break;
+ }
+
+ assert(status == ARGPAR_STATE_PARSE_NEXT_STATUS_OK);
+ assert(item->type == ARGPAR_ITEM_TYPE_NON_OPT);
+
+ item_non_opt = (struct argpar_item_non_opt *) item;
+
+ switch (item_non_opt->non_opt_index) {
+ case 0:
+ session_name_arg = item_non_opt->arg;
+ break;
+ default:
+ ERR("Unexpected argument `%s`.",
+ item_non_opt->arg);
+ goto error;
+ }
+ }
+
+ *argc -= argpar_state_get_ingested_orig_args(state);
+ *argv += argpar_state_get_ingested_orig_args(state);
+
+ if (!session_name_arg) {
+ ERR("Missing session name.");
+ goto error;
+ }
+
+ action = create_action_cb();
+ if (!action) {
+ ERR(
+ "Failed to allocate %s session action.", action_name);
+ goto error;
+ }
+
+ action_status = set_session_name_cb(action, session_name_arg);
+ if (action_status != LTTNG_ACTION_STATUS_OK) {
+ ERR(
+ "Failed to set action %s session's session name.",
+ action_name);
+ goto error;
+ }
+
+ goto end;
+
+error:
+ lttng_action_destroy(action);
+ action = NULL;
+
+end:
+ return action;
+}
+
+static
+struct lttng_action *handle_action_start_session(int *argc,
+ const char ***argv)
+{
+ return handle_action_simple_session(argc, argv,
+ lttng_action_start_session_create,
+ lttng_action_start_session_set_session_name,
+ "start");
+}
+
+static
+struct lttng_action *handle_action_stop_session(int *argc,
+ const char ***argv)
+{
+ return handle_action_simple_session(argc, argv,
+ lttng_action_stop_session_create,
+ lttng_action_stop_session_set_session_name,
+ "stop");
+}
+
+static
+struct lttng_action *handle_action_rotate_session(int *argc,
+ const char ***argv)
+{
+ return handle_action_simple_session(argc, argv,
+ lttng_action_rotate_session_create,
+ lttng_action_rotate_session_set_session_name,
+ "rotate");
+}
+
+static const struct argpar_opt_descr snapshot_action_opt_descrs[] = {
+ { OPT_NAME, 'n', "name", true },
+ { OPT_MAX_SIZE, 'm', "max-size", true },
+ { OPT_CTRL_URL, '\0', "ctrl-url", true },
+ { OPT_DATA_URL, '\0', "data-url", true },
+ ARGPAR_OPT_DESCR_SENTINEL
+};
+
+static
+struct lttng_action *handle_action_snapshot_session(int *argc,
+ const char ***argv)
+{
+ struct lttng_action *action = NULL;
+ struct argpar_state *state = NULL;
+ struct argpar_item *item = NULL;
+ const char *session_name_arg = NULL;
+ char *snapshot_name_arg = NULL;
+ char *ctrl_url_arg = NULL;
+ char *data_url_arg = NULL;
+ char *max_size_arg = NULL;
+ const char *url_arg = NULL;
+ char *error = NULL;
+ enum lttng_action_status action_status;
+ struct lttng_snapshot_output *snapshot_output = NULL;
+ int ret;
+
+ state = argpar_state_create(*argc, *argv, snapshot_action_opt_descrs);
+ if (!state) {
+ ERR("Failed to allocate an argpar state.");
+ goto error;
+ }
+
+ while (true) {
+ enum argpar_state_parse_next_status status;
+
+ ARGPAR_ITEM_DESTROY_AND_RESET(item);
+ status = argpar_state_parse_next(state, &item, &error);
+ if (status == ARGPAR_STATE_PARSE_NEXT_STATUS_ERROR) {
+ ERR("%s", error);
+ goto error;
+ } else if (status == ARGPAR_STATE_PARSE_NEXT_STATUS_ERROR_UNKNOWN_OPT) {
+ /* Just stop parsing here. */
+ break;
+ } else if (status == ARGPAR_STATE_PARSE_NEXT_STATUS_END) {
+ break;
+ }
+
+ assert(status == ARGPAR_STATE_PARSE_NEXT_STATUS_OK);
+
+ if (item->type == ARGPAR_ITEM_TYPE_OPT) {
+ struct argpar_item_opt *item_opt =
+ (struct argpar_item_opt *) item;
+
+ switch (item_opt->descr->id) {
+ case OPT_NAME:
+ if (!assign_string(&snapshot_name_arg, item_opt->arg, "--name/-n")) {
+ goto error;
+ }
+ break;
+
+ case OPT_MAX_SIZE:
+ if (!assign_string(&max_size_arg, item_opt->arg, "--max-size/-m")) {
+ goto error;
+ }
+ break;
+
+ case OPT_CTRL_URL:
+ if (!assign_string(&ctrl_url_arg, item_opt->arg, "--ctrl-url")) {
+ goto error;
+ }
+ break;
+
+ case OPT_DATA_URL:
+ if (!assign_string(&data_url_arg, item_opt->arg, "--data-url")) {
+ goto error;
+ }
+ break;
+
+ default:
+ abort();
+ }
+ } else {
+ struct argpar_item_non_opt *item_non_opt;
+
+ assert(item->type == ARGPAR_ITEM_TYPE_NON_OPT);
+
+ item_non_opt = (struct argpar_item_non_opt *) item;
+
+ switch (item_non_opt->non_opt_index) {
+ case 0:
+ session_name_arg = item_non_opt->arg;
+ break;
+
+ // FIXME: the use of a non-option argument for this is to
+ // follow the syntax of `lttng snapshot record`. But otherwise,
+ // I think an option argument would be best.
+ case 1:
+ url_arg = item_non_opt->arg;
+ break;
+
+ default:
+ ERR("Unexpected argument `%s`.",
+ item_non_opt->arg);
+ goto error;
+ }
+ }
+ }
+
+ *argc -= argpar_state_get_ingested_orig_args(state);
+ *argv += argpar_state_get_ingested_orig_args(state);
+
+ if (!session_name_arg) {
+ ERR("Missing session name.");
+ goto error;
+ }
+
+ /* --ctrl-url and --data-url must come in pair. */
+ if (ctrl_url_arg && !data_url_arg) {
+ ERR("--ctrl-url is specified, but --data-url is missing.");
+ goto error;
+ }
+
+ if (!ctrl_url_arg && data_url_arg) {
+ ERR("--data-url is specified, but --ctrl-url is missing.");
+ goto error;
+ }
+
+ /* --ctrl-url/--data-url and the non-option URL are mutually exclusive. */
+ if (ctrl_url_arg && url_arg) {
+ ERR("Both --ctrl-url/--data-url and the non-option URL argument "
+ "can't be used together.");
+ goto error;
+ }
+
+ /*
+ * Did the user specify an option that implies using a
+ * custom/unregistered output?
+ */
+ if (url_arg || ctrl_url_arg) {
+ snapshot_output = lttng_snapshot_output_create();
+ if (!snapshot_output) {
+ ERR("Failed to allocate a snapshot output.");
+ goto error;
+ }
+ }
+
+ action = lttng_action_snapshot_session_create();
+ if (!action) {
+ ERR(
+ "Failed to allocate snapshot session action.");
+ goto error;
+ }
+
+ action_status = lttng_action_snapshot_session_set_session_name(
+ action, session_name_arg);
+ if (action_status != LTTNG_ACTION_STATUS_OK) {
+ ERR(
+ "Failed to set action snapshot session's session name.");
+ goto error;
+ }
+
+ if (snapshot_name_arg) {
+ if (!snapshot_output) {
+ ERR("Can't provide a snapshot output name without a snapshot output destination.");
+ goto error;
+ }
+
+ ret = lttng_snapshot_output_set_name(snapshot_name_arg, snapshot_output);
+ if (ret != 0) {
+ ERR("Failed to set name of snapshot output.");
+ goto error;
+ }
+ }
+
+ if (max_size_arg) {
+ uint64_t max_size;
+
+ if (!snapshot_output) {
+ ERR("Can't provide a snapshot output max size without a snapshot output destination.");
+ goto error;
+ }
+
+ ret = utils_parse_size_suffix(max_size_arg, &max_size);
+ if (ret != 0) {
+ ERR("Failed to parse `%s` as a size.", max_size_arg);
+ goto error;
+ }
+
+ ret = lttng_snapshot_output_set_size(max_size, snapshot_output);
+ if (ret != 0) {
+ ERR("Failed to set snapshot output's max size.");
+ goto error;
+ }
+ }
+
+ if (url_arg) {
+ /* One argument form, either net:// / net6:// or a local file path. */
+
+ if (strncmp(url_arg, "net://", strlen("net://")) == 0 ||
+ strncmp(url_arg, "net6://", strlen("net6://")) == 0) {
+ ret = lttng_snapshot_output_set_network_url(
+ url_arg, snapshot_output);
+ if (ret != 0) {
+ ERR("Failed to parse %s as a network URL.", url_arg);
+ goto error;
+ }
+ } else {
+ ret = lttng_snapshot_output_set_local_path(
+ url_arg, snapshot_output);
+ if (ret != 0) {
+ ERR("Failed to parse %s as a local path.", url_arg);
+ goto error;
+ }
+ }
+ }
+
+ if (ctrl_url_arg) {
+ /*
+ * Two argument form, network output with separate control and
+ * data URLs.
+ */
+ ret = lttng_snapshot_output_set_network_urls(
+ ctrl_url_arg, data_url_arg, snapshot_output);
+ if (ret != 0) {
+ ERR("Failed to parse `%s` and `%s` as control and data URLs.",
+ ctrl_url_arg, data_url_arg);
+ goto error;
+ }
+ }
+
+ if (snapshot_output) {
+ action_status = lttng_action_snapshot_session_set_output(
+ action, snapshot_output);
+ if (action_status != LTTNG_ACTION_STATUS_OK) {
+ ERR("Failed to set snapshot session action's output.");
+ goto error;
+ }
+
+ /* Ownership of `snapshot_output` has been transferred to the action. */
+ snapshot_output = NULL;
+ }
+
+ goto end;
+
+error:
+ lttng_action_destroy(action);
+ action = NULL;
+
+end:
+ free(snapshot_name_arg);
+ free(ctrl_url_arg);
+ free(data_url_arg);
+ free(snapshot_output);
+ return action;
+}
+
+struct action_descr {
+ const char *name;
+ struct lttng_action *(*handler) (int *argc, const char ***argv);
+};
+
+static const
+struct action_descr action_descrs[] = {
+ { "notify", handle_action_notify },
+ { "start-session", handle_action_start_session },
+ { "stop-session", handle_action_stop_session },
+ { "rotate-session", handle_action_rotate_session },
+ { "snapshot-session", handle_action_snapshot_session },
+};
+
+static
+struct lttng_action *parse_action(int *argc, const char ***argv)
+{
+ int i;
+ struct lttng_action *action;
+ const char *action_name;
+ const struct action_descr *descr = NULL;
+
+ if (*argc == 0) {
+ ERR("Missing action name.");
+ goto error;
+ }
+
+ action_name = (*argv)[0];
+
+ (*argc)--;
+ (*argv)++;
+
+ for (i = 0; i < ARRAY_SIZE(action_descrs); i++) {
+ if (strcmp(action_name, action_descrs[i].name) == 0) {
+ descr = &action_descrs[i];
+ break;
+ }
+ }
+
+ if (!descr) {
+ ERR("Unknown action name: %s", action_name);
+ goto error;
+ }
+
+ action = descr->handler(argc, argv);
+ if (!action) {
+ /* The handler has already printed an error message. */
+ goto error;
+ }
+
+ goto end;
+error:
+ action = NULL;
+end:
+ return action;
+}
+
+static const
+struct argpar_opt_descr add_trigger_options[] = {
+ { OPT_HELP, 'h', "help", false },
+ { OPT_LIST_OPTIONS, '\0', "list-options", false },
+ { OPT_CONDITION, '\0', "condition", false },
+ { OPT_ACTION, '\0', "action", false },
+ { OPT_ID, '\0', "id", true },
+ { OPT_FIRE_ONCE_AFTER, '\0', "fire-once-after", true },
+ { OPT_FIRE_EVERY, '\0', "fire-every", true },
+ { OPT_USER_ID, '\0', "user-id", true },
+ ARGPAR_OPT_DESCR_SENTINEL,
+};
+
+static
+void lttng_actions_destructor(void *p)
+{
+ struct lttng_action *action = p;
+
+ lttng_action_destroy(action);
+}
+
+int cmd_add_trigger(int argc, const char **argv)
+{
+ int ret;
+ int my_argc = argc - 1;
+ const char **my_argv = argv + 1;
+ struct lttng_condition *condition = NULL;
+ struct lttng_dynamic_pointer_array actions;
+ struct argpar_state *argpar_state = NULL;
+ struct argpar_item *argpar_item = NULL;
+ struct lttng_action *action_group = NULL;
+ struct lttng_action *action = NULL;
+ struct lttng_trigger *trigger = NULL;
+ char *error = NULL;
+ char *id = NULL;
+ int i;
+ char *fire_once_after_str = NULL;
+ char *fire_every_str = NULL;
+ char *user_id = NULL;
+
+ lttng_dynamic_pointer_array_init(&actions, lttng_actions_destructor);
+
+ while (true) {
+ enum argpar_state_parse_next_status status;
+ struct argpar_item_opt *item_opt;
+ int ingested_args;
+
+ argpar_state_destroy(argpar_state);
+ argpar_state = argpar_state_create(my_argc, my_argv,
+ add_trigger_options);
+ if (!argpar_state) {
+ ERR("Failed to create argpar state.");
+ goto error;
+ }
+
+ status = argpar_state_parse_next(argpar_state, &argpar_item, &error);
+
+ if (status == ARGPAR_STATE_PARSE_NEXT_STATUS_ERROR) {
+ ERR("%s", error);
+ goto error;
+ } else if (status == ARGPAR_STATE_PARSE_NEXT_STATUS_ERROR_UNKNOWN_OPT) {
+ ERR("%s", error);
+ goto error;
+ } else if (status == ARGPAR_STATE_PARSE_NEXT_STATUS_END) {
+ break;
+ }
+
+ assert(status == ARGPAR_STATE_PARSE_NEXT_STATUS_OK);
+
+ if (argpar_item->type == ARGPAR_ITEM_TYPE_NON_OPT) {
+ struct argpar_item_non_opt *item_non_opt =
+ (struct argpar_item_non_opt *) argpar_item;
+
+ ERR("Unexpected argument `%s`.",
+ item_non_opt->arg);
+ goto error;
+ }
+
+ item_opt = (struct argpar_item_opt *) argpar_item;
+
+ ingested_args = argpar_state_get_ingested_orig_args(
+ argpar_state);
+
+ my_argc -= ingested_args;
+ my_argv += ingested_args;
+
+ switch (item_opt->descr->id) {
+ case OPT_HELP:
+ SHOW_HELP();
+ ret = 0;
+ goto end;
+
+ case OPT_LIST_OPTIONS:
+ list_cmd_options_argpar(stdout, add_trigger_options);
+ ret = 0;
+ goto end;
+
+ case OPT_CONDITION:
+ {
+ if (condition) {
+ ERR("A --condition was already given.");
+ goto error;
+ }
+
+ condition = parse_condition(&my_argc, &my_argv);
+ if (!condition) {
+ /*
+ * An error message was already printed by
+ * parse_condition.
+ */
+ goto error;
+ }
+
+ break;
+ }
+
+ case OPT_ACTION:
+ {
+ action = parse_action(&my_argc, &my_argv);
+ if (!action) {
+ /*
+ * An error message was already printed by
+ * parse_condition.
+ */
+ goto error;
+ }
+
+ ret = lttng_dynamic_pointer_array_add_pointer(
+ &actions, action);
+ if (ret) {
+ ERR("Failed to add pointer to pointer array.");
+ goto error;
+ }
+
+ /* Ownership of the action was transferred to the group. */
+ action = NULL;
+
+ break;
+ }
+
+ case OPT_ID:
+ {
+ if (!assign_string(&id, item_opt->arg, "--id")) {
+ goto error;
+ }
+
+ break;
+ }
+
+ case OPT_FIRE_ONCE_AFTER:
+ {
+ if (!assign_string(&fire_once_after_str, item_opt->arg,
+ "--fire-once-after")) {
+ goto error;
+ }
+ break;
+ }
+
+ case OPT_FIRE_EVERY:
+ {
+ if (!assign_string(&fire_every_str, item_opt->arg,
+ "--fire-every")) {
+ goto error;
+ }
+ break;
+ }
+
+ case OPT_USER_ID:
+ {
+ if (!assign_string(&user_id, item_opt->arg,
+ "--user-id")) {
+ goto error;
+ }
+ break;
+ }
+
+ default:
+ abort();
+ }
+ }
+
+ if (!condition) {
+ ERR("Missing --condition.");
+ goto error;
+ }
+
+ if (lttng_dynamic_pointer_array_get_count(&actions) == 0) {
+ ERR("Need at least one --action.");
+ goto error;
+ }
+
+ if (fire_every_str && fire_once_after_str) {
+ ERR("Can't specify both --fire-once-after and --fire-every.");
+ goto error;
+ }
+
+ action_group = lttng_action_group_create();
+ if (!action_group) {
+ goto error;
+ }
+
+ for (i = 0; i < lttng_dynamic_pointer_array_get_count(&actions); i++) {
+ enum lttng_action_status status;
+
+ action = lttng_dynamic_pointer_array_steal_pointer(&actions, i);
+
+ status = lttng_action_group_add_action(
+ action_group, action);
+ if (status != LTTNG_ACTION_STATUS_OK) {
+ goto error;
+ }
+
+ /* Ownership of the action was transferred to the group. */
+ action = NULL;
+ }
+
+
+ trigger = lttng_trigger_create(condition, action_group);
+ if (!trigger) {
+ goto error;
+ }
+
+ if (id) {
+ enum lttng_trigger_status trigger_status =
+ lttng_trigger_set_name(trigger, id);
+ if (trigger_status != LTTNG_TRIGGER_STATUS_OK) {
+ ERR("Failed to set trigger id.");
+ goto error;
+ }
+ }
+
+ if (fire_once_after_str) {
+ unsigned long long threshold;
+ enum lttng_trigger_status trigger_status;
+
+ if (utils_parse_unsigned_long_long(fire_once_after_str, &threshold) != 0) {
+ ERR("Failed to parse `%s` as an integer.", fire_once_after_str);
+ goto error;
+ }
+
+ trigger_status = lttng_trigger_set_firing_policy(trigger,
+ LTTNG_TRIGGER_FIRE_ONCE_AFTER_N, threshold);
+ if (trigger_status != LTTNG_TRIGGER_STATUS_OK) {
+ ERR("Failed to set trigger's firing policy.");
+ goto error;
+ }
+ }
+
+ if (fire_every_str) {
+ unsigned long long threshold;
+ enum lttng_trigger_status trigger_status;
+
+ if (utils_parse_unsigned_long_long(fire_every_str, &threshold) != 0) {
+ ERR("Failed to parse `%s` as an integer.", fire_every_str);
+ goto error;
+ }
+
+ trigger_status = lttng_trigger_set_firing_policy(trigger,
+ LTTNG_TRIGGER_FIRE_EVERY_N, threshold);
+ if (trigger_status != LTTNG_TRIGGER_STATUS_OK) {
+ ERR("Failed to set trigger's firing policy.");
+ goto error;
+ }
+ }
+
+ if (user_id) {
+ enum lttng_trigger_status trigger_status;
+ char *end;
+ long long uid;
+
+ errno = 0;
+ uid = strtol(user_id, &end, 10);
+ if (end == user_id || *end != '\0' || errno != 0) {
+ ERR("Failed to parse `%s` as an integer.", user_id);
+ }
+
+ trigger_status = lttng_trigger_set_user_identity(trigger,
+ uid);
+ if (trigger_status != LTTNG_TRIGGER_STATUS_OK) {
+ ERR("Failed to set trigger's user identity.");
+ goto error;
+ }
+ }
+
+ ret = lttng_register_trigger(trigger);
+ if (ret) {
+ ERR("Failed to register trigger: %s.",
+ lttng_strerror(ret));
+ goto error;
+ }
+
+ MSG("Trigger registered successfully.");
+
+ goto end;
+
+error:
+ ret = 1;
+
+end:
+ argpar_state_destroy(argpar_state);
+ lttng_dynamic_pointer_array_reset(&actions);
+ lttng_condition_destroy(condition);
+ lttng_action_destroy(action_group);
+ lttng_trigger_destroy(trigger);
+ free(id);
+ free(fire_once_after_str);
+ free(fire_every_str);
+ free(user_id);
+ // TODO: check what else to free
+
+ return ret;
+}
projects / lttng-tools.git / blobdiff