X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fcommon%2Ftrigger.c;fp=src%2Fcommon%2Ftrigger.c;h=0000000000000000000000000000000000000000;hp=76082a0855d05bb7571f8e017a41f244748dac6b;hb=a6bc4ca9d659caf016ef932fcd944029737ac57c;hpb=97535efaa975ca52bf02c2d5e76351bfd2e3defa diff --git a/src/common/trigger.c b/src/common/trigger.c deleted file mode 100644 index 76082a085..000000000 --- a/src/common/trigger.c +++ /dev/null @@ -1,1240 +0,0 @@ -/* - * Copyright (C) 2017 Jérémie Galarneau - * - * SPDX-License-Identifier: LGPL-2.1-only - * - */ - -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -bool lttng_trigger_validate(const struct lttng_trigger *trigger) -{ - bool valid; - - if (!trigger) { - valid = false; - goto end; - } - - if (!trigger->creds.uid.is_set) { - valid = false; - goto end; - } - - valid = lttng_condition_validate(trigger->condition) && - lttng_action_validate(trigger->action); -end: - return valid; -} - -struct lttng_trigger *lttng_trigger_create( - struct lttng_condition *condition, - struct lttng_action *action) -{ - struct lttng_trigger *trigger = NULL; - - if (!condition || !action) { - goto end; - } - - trigger = zmalloc(sizeof(struct lttng_trigger)); - if (!trigger) { - goto end; - } - - urcu_ref_init(&trigger->ref); - - lttng_condition_get(condition); - trigger->condition = condition; - - lttng_action_get(action); - trigger->action = action; - - pthread_mutex_init(&trigger->lock, NULL); - trigger->registered = false; - -end: - return trigger; -} - -/* - * Note: the lack of reference counting 'get' on the condition object is normal. - * This API was exposed as such in 2.11. The client is not expected to call - * lttng_condition_destroy on the returned object. - */ -struct lttng_condition *lttng_trigger_get_condition( - struct lttng_trigger *trigger) -{ - return trigger ? trigger->condition : NULL; -} - -const struct lttng_condition *lttng_trigger_get_const_condition( - const struct lttng_trigger *trigger) -{ - return trigger ? trigger->condition : NULL; -} - -/* - * Note: the lack of reference counting 'get' on the action object is normal. - * This API was exposed as such in 2.11. The client is not expected to call - * lttng_action_destroy on the returned object. - */ -struct lttng_action *lttng_trigger_get_action( - struct lttng_trigger *trigger) -{ - return trigger ? trigger->action : NULL; -} - -const struct lttng_action *lttng_trigger_get_const_action( - const struct lttng_trigger *trigger) -{ - return trigger ? trigger->action : NULL; -} - -static void trigger_destroy_ref(struct urcu_ref *ref) -{ - struct lttng_trigger *trigger = - container_of(ref, struct lttng_trigger, ref); - struct lttng_action *action = lttng_trigger_get_action(trigger); - struct lttng_condition *condition = - lttng_trigger_get_condition(trigger); - - LTTNG_ASSERT(action); - LTTNG_ASSERT(condition); - - /* Release ownership. */ - lttng_action_put(action); - lttng_condition_put(condition); - - pthread_mutex_destroy(&trigger->lock); - - free(trigger->name); - free(trigger); -} - -void lttng_trigger_destroy(struct lttng_trigger *trigger) -{ - lttng_trigger_put(trigger); -} - -ssize_t lttng_trigger_create_from_payload( - struct lttng_payload_view *src_view, - struct lttng_trigger **_trigger) -{ - ssize_t ret, offset = 0, condition_size, action_size, name_size = 0; - struct lttng_condition *condition = NULL; - struct lttng_action *action = NULL; - const struct lttng_trigger_comm *trigger_comm; - const char *name = NULL; - struct lttng_credentials creds = { - .uid = LTTNG_OPTIONAL_INIT_UNSET, - .gid = LTTNG_OPTIONAL_INIT_UNSET, - }; - struct lttng_trigger *trigger = NULL; - const struct lttng_payload_view trigger_comm_view = - lttng_payload_view_from_view( - src_view, 0, sizeof(*trigger_comm)); - - if (!src_view || !_trigger) { - ret = -1; - goto end; - } - - if (!lttng_payload_view_is_valid(&trigger_comm_view)) { - /* Payload not large enough to contain the header. */ - ret = -1; - goto end; - } - - /* lttng_trigger_comm header */ - trigger_comm = (typeof(trigger_comm)) trigger_comm_view.buffer.data; - - /* Set the trigger's creds. */ - if (trigger_comm->uid > (uint64_t) ((uid_t) -1)) { - /* UID out of range for this platform. */ - ret = -1; - goto end; - } - - LTTNG_OPTIONAL_SET(&creds.uid, trigger_comm->uid); - - offset += sizeof(*trigger_comm); - - if (trigger_comm->name_length != 0) { - /* Name. */ - const struct lttng_payload_view name_view = - lttng_payload_view_from_view( - src_view, offset, - trigger_comm->name_length); - - if (!lttng_payload_view_is_valid(&name_view)) { - ret = -1; - goto end; - } - - name = name_view.buffer.data; - if (!lttng_buffer_view_contains_string(&name_view.buffer, name, - trigger_comm->name_length)) { - ret = -1; - goto end; - } - - offset += trigger_comm->name_length; - name_size = trigger_comm->name_length; - } - - { - /* struct lttng_condition */ - struct lttng_payload_view condition_view = - lttng_payload_view_from_view( - src_view, offset, -1); - - condition_size = lttng_condition_create_from_payload(&condition_view, - &condition); - } - - if (condition_size < 0) { - ret = condition_size; - goto end; - } - - offset += condition_size; - { - /* struct lttng_action */ - struct lttng_payload_view action_view = - lttng_payload_view_from_view( - src_view, offset, -1); - - action_size = lttng_action_create_from_payload(&action_view, &action); - } - - if (action_size < 0) { - ret = action_size; - goto end; - } - offset += action_size; - - /* Unexpected size of inner-elements; the buffer is corrupted. */ - if ((ssize_t) trigger_comm->length != condition_size + action_size + name_size) { - ret = -1; - goto error; - } - - trigger = lttng_trigger_create(condition, action); - if (!trigger) { - ret = -1; - goto error; - } - - lttng_trigger_set_credentials(trigger, &creds); - - /* - * The trigger object owns references to the action and condition - * objects. - */ - lttng_condition_put(condition); - condition = NULL; - - lttng_action_put(action); - action = NULL; - - if (name) { - const enum lttng_trigger_status status = - lttng_trigger_set_name(trigger, name); - - if (status != LTTNG_TRIGGER_STATUS_OK) { - ret = -1; - goto end; - } - } - - ret = offset; - -error: - lttng_condition_put(condition); - lttng_action_put(action); -end: - if (ret >= 0) { - *_trigger = trigger; - } else { - lttng_trigger_put(trigger); - } - - return ret; -} - -/* - * Both elements are stored contiguously, see their "*_comm" structure - * for the detailed format. - */ -int lttng_trigger_serialize(const struct lttng_trigger *trigger, - struct lttng_payload *payload) -{ - int ret; - size_t header_offset, size_before_payload, size_name; - struct lttng_trigger_comm trigger_comm = {}; - struct lttng_trigger_comm *header; - const struct lttng_credentials *creds = NULL; - - creds = lttng_trigger_get_credentials(trigger); - LTTNG_ASSERT(creds); - - trigger_comm.uid = LTTNG_OPTIONAL_GET(creds->uid); - - if (trigger->name != NULL) { - size_name = strlen(trigger->name) + 1; - } else { - size_name = 0; - } - - trigger_comm.name_length = size_name; - - header_offset = payload->buffer.size; - ret = lttng_dynamic_buffer_append(&payload->buffer, &trigger_comm, - sizeof(trigger_comm)); - if (ret) { - goto end; - } - - size_before_payload = payload->buffer.size; - - /* Trigger name. */ - ret = lttng_dynamic_buffer_append( - &payload->buffer, trigger->name, size_name); - if (ret) { - goto end; - } - - ret = lttng_condition_serialize(trigger->condition, payload); - if (ret) { - goto end; - } - - ret = lttng_action_serialize(trigger->action, payload); - if (ret) { - goto end; - } - - /* Update payload size. */ - header = (typeof(header)) (payload->buffer.data + header_offset); - header->length = payload->buffer.size - size_before_payload; -end: - return ret; -} - -bool lttng_trigger_is_equal( - const struct lttng_trigger *a, const struct lttng_trigger *b) -{ - if (!!a->name != !!b->name) { - /* Both must be either anonymous or named. */ - return false; - } - - if (a->name && strcmp(a->name, b->name) != 0) { - return false; - } - - if (!lttng_condition_is_equal(a->condition, b->condition)) { - return false; - } - - if (!lttng_action_is_equal(a->action, b->action)) { - return false; - } - - if (!lttng_credentials_is_equal(lttng_trigger_get_credentials(a), - lttng_trigger_get_credentials(b))) { - return false; - } - - if (a->is_hidden != b->is_hidden) { - return false; - } - - return true; -} - -bool lttng_trigger_is_hidden(const struct lttng_trigger *trigger) -{ - return trigger->is_hidden; -} - -void lttng_trigger_set_hidden(struct lttng_trigger *trigger) -{ - LTTNG_ASSERT(!trigger->is_hidden); - trigger->is_hidden = true; -} - -enum lttng_trigger_status lttng_trigger_set_name(struct lttng_trigger *trigger, - const char* name) -{ - char *name_copy = NULL; - enum lttng_trigger_status status = LTTNG_TRIGGER_STATUS_OK; - - if (!trigger) { - status = LTTNG_TRIGGER_STATUS_INVALID; - goto end; - } - - if (name) { - name_copy = strdup(name); - if (!name_copy) { - status = LTTNG_TRIGGER_STATUS_ERROR; - goto end; - } - } - - free(trigger->name); - - trigger->name = name_copy; - name_copy = NULL; -end: - return status; -} - -enum lttng_trigger_status lttng_trigger_get_name( - const struct lttng_trigger *trigger, const char **name) -{ - enum lttng_trigger_status status = LTTNG_TRIGGER_STATUS_OK; - - if (!trigger || !name) { - status = LTTNG_TRIGGER_STATUS_INVALID; - goto end; - } - - if (!trigger->name) { - status = LTTNG_TRIGGER_STATUS_UNSET; - } - - *name = trigger->name; -end: - return status; -} - -int lttng_trigger_assign_name(struct lttng_trigger *dst, - const struct lttng_trigger *src) -{ - int ret = 0; - enum lttng_trigger_status status; - - status = lttng_trigger_set_name(dst, src->name); - if (status != LTTNG_TRIGGER_STATUS_OK) { - ret = -1; - ERR("Failed to set name for trigger"); - goto end; - } -end: - return ret; -} - -void lttng_trigger_set_tracer_token(struct lttng_trigger *trigger, - uint64_t token) -{ - LTTNG_ASSERT(trigger); - LTTNG_OPTIONAL_SET(&trigger->tracer_token, token); -} - -uint64_t lttng_trigger_get_tracer_token(const struct lttng_trigger *trigger) -{ - LTTNG_ASSERT(trigger); - - return LTTNG_OPTIONAL_GET(trigger->tracer_token); -} - -int lttng_trigger_generate_name(struct lttng_trigger *trigger, - uint64_t unique_id) -{ - int ret = 0; - char *generated_name = NULL; - - ret = asprintf(&generated_name, "trigger%" PRIu64 "", unique_id); - if (ret < 0) { - ERR("Failed to generate trigger name"); - ret = -1; - goto end; - } - - ret = 0; - free(trigger->name); - trigger->name = generated_name; -end: - return ret; -} - -void lttng_trigger_get(struct lttng_trigger *trigger) -{ - urcu_ref_get(&trigger->ref); -} - -void lttng_trigger_put(struct lttng_trigger *trigger) -{ - if (!trigger) { - return; - } - - urcu_ref_put(&trigger->ref , trigger_destroy_ref); -} - -static void delete_trigger_array_element(void *ptr) -{ - struct lttng_trigger *trigger = ptr; - - lttng_trigger_put(trigger); -} - -struct lttng_triggers *lttng_triggers_create(void) -{ - struct lttng_triggers *triggers = NULL; - - triggers = zmalloc(sizeof(*triggers)); - if (!triggers) { - goto end; - } - - lttng_dynamic_pointer_array_init(&triggers->array, delete_trigger_array_element); - -end: - return triggers; -} - -struct lttng_trigger *lttng_triggers_borrow_mutable_at_index( - const struct lttng_triggers *triggers, unsigned int index) -{ - struct lttng_trigger *trigger = NULL; - - LTTNG_ASSERT(triggers); - if (index >= lttng_dynamic_pointer_array_get_count(&triggers->array)) { - goto end; - } - - trigger = (struct lttng_trigger *) - lttng_dynamic_pointer_array_get_pointer( - &triggers->array, index); -end: - return trigger; -} - -int lttng_triggers_add( - struct lttng_triggers *triggers, struct lttng_trigger *trigger) -{ - int ret; - - LTTNG_ASSERT(triggers); - LTTNG_ASSERT(trigger); - - lttng_trigger_get(trigger); - - ret = lttng_dynamic_pointer_array_add_pointer(&triggers->array, trigger); - if (ret) { - lttng_trigger_put(trigger); - } - - return ret; -} - -int lttng_triggers_remove_hidden_triggers(struct lttng_triggers *triggers) -{ - int ret; - unsigned int trigger_count, i = 0; - enum lttng_trigger_status trigger_status; - - LTTNG_ASSERT(triggers); - - trigger_status = lttng_triggers_get_count(triggers, &trigger_count); - LTTNG_ASSERT(trigger_status == LTTNG_TRIGGER_STATUS_OK); - - while (i < trigger_count) { - const struct lttng_trigger *trigger = - lttng_triggers_get_at_index(triggers, i); - - if (lttng_trigger_is_hidden(trigger)) { - ret = lttng_dynamic_pointer_array_remove_pointer( - &triggers->array, i); - if (ret) { - goto end; - } - - trigger_count--; - } else { - i++; - } - } - - ret = 0; -end: - return ret; -} - -const struct lttng_trigger *lttng_triggers_get_at_index( - const struct lttng_triggers *triggers, unsigned int index) -{ - return lttng_triggers_borrow_mutable_at_index(triggers, index); -} - -enum lttng_trigger_status lttng_triggers_get_count(const struct lttng_triggers *triggers, unsigned int *count) -{ - enum lttng_trigger_status status = LTTNG_TRIGGER_STATUS_OK; - - if (!triggers || !count) { - status = LTTNG_TRIGGER_STATUS_INVALID; - goto end; - } - - *count = lttng_dynamic_pointer_array_get_count(&triggers->array); -end: - return status; -} - -void lttng_triggers_destroy(struct lttng_triggers *triggers) -{ - if (!triggers) { - return; - } - - lttng_dynamic_pointer_array_reset(&triggers->array); - free(triggers); -} - -int lttng_triggers_serialize(const struct lttng_triggers *triggers, - struct lttng_payload *payload) -{ - int ret; - unsigned int i, count; - size_t size_before_payload; - struct lttng_triggers_comm triggers_comm = {}; - struct lttng_triggers_comm *header; - enum lttng_trigger_status status; - const size_t header_offset = payload->buffer.size; - - status = lttng_triggers_get_count(triggers, &count); - if (status != LTTNG_TRIGGER_STATUS_OK) { - ret = LTTNG_ERR_INVALID; - goto end; - } - - triggers_comm.count = count; - - /* Placeholder header; updated at the end. */ - ret = lttng_dynamic_buffer_append(&payload->buffer, &triggers_comm, - sizeof(triggers_comm)); - if (ret) { - goto end; - } - - size_before_payload = payload->buffer.size; - - for (i = 0; i < count; i++) { - const struct lttng_trigger *trigger = - lttng_triggers_get_at_index(triggers, i); - - LTTNG_ASSERT(trigger); - - ret = lttng_trigger_serialize(trigger, payload); - if (ret) { - goto end; - } - } - - /* Update payload size. */ - header = (struct lttng_triggers_comm *) ((char *) payload->buffer.data + header_offset); - header->length = payload->buffer.size - size_before_payload; -end: - return ret; -} - -ssize_t lttng_triggers_create_from_payload( - struct lttng_payload_view *src_view, - struct lttng_triggers **triggers) -{ - ssize_t ret, offset = 0, triggers_size = 0; - unsigned int i; - const struct lttng_triggers_comm *triggers_comm; - struct lttng_triggers *local_triggers = NULL; - - if (!src_view || !triggers) { - ret = -1; - goto error; - } - - /* lttng_trigger_comms header */ - triggers_comm = (const struct lttng_triggers_comm *) src_view->buffer.data; - offset += sizeof(*triggers_comm); - - local_triggers = lttng_triggers_create(); - if (!local_triggers) { - ret = -1; - goto error; - } - - for (i = 0; i < triggers_comm->count; i++) { - struct lttng_trigger *trigger = NULL; - struct lttng_payload_view trigger_view = - lttng_payload_view_from_view(src_view, offset, -1); - ssize_t trigger_size; - - trigger_size = lttng_trigger_create_from_payload( - &trigger_view, &trigger); - if (trigger_size < 0) { - ret = trigger_size; - goto error; - } - - /* Transfer ownership of the trigger to the collection. */ - ret = lttng_triggers_add(local_triggers, trigger); - lttng_trigger_put(trigger); - if (ret < 0) { - ret = -1; - goto error; - } - - offset += trigger_size; - triggers_size += trigger_size; - } - - /* Unexpected size of inner-elements; the buffer is corrupted. */ - if ((ssize_t) triggers_comm->length != triggers_size) { - ret = -1; - goto error; - } - - /* Pass ownership to caller. */ - *triggers = local_triggers; - local_triggers = NULL; - - ret = offset; -error: - - lttng_triggers_destroy(local_triggers); - return ret; -} - -const struct lttng_credentials *lttng_trigger_get_credentials( - const struct lttng_trigger *trigger) -{ - return &trigger->creds; -} - -void lttng_trigger_set_credentials(struct lttng_trigger *trigger, - const struct lttng_credentials *creds) -{ - LTTNG_ASSERT(creds); - trigger->creds = *creds; -} - -enum lttng_trigger_status lttng_trigger_set_owner_uid( - struct lttng_trigger *trigger, uid_t uid) -{ - enum lttng_trigger_status ret = LTTNG_TRIGGER_STATUS_OK; - const uid_t euid = geteuid(); - const struct lttng_credentials creds = { - .uid = LTTNG_OPTIONAL_INIT_VALUE(uid), - .gid = LTTNG_OPTIONAL_INIT_UNSET, - }; - - if (!trigger) { - ret = LTTNG_TRIGGER_STATUS_INVALID; - goto end; - } - - /* Client-side validation only to report a clearer error. */ - if (euid != 0 && euid != uid) { - ret = LTTNG_TRIGGER_STATUS_PERMISSION_DENIED; - goto end; - } - - lttng_trigger_set_credentials(trigger, &creds); - -end: - return ret; -} - -enum lttng_trigger_status lttng_trigger_get_owner_uid( - const struct lttng_trigger *trigger, uid_t *uid) -{ - enum lttng_trigger_status ret = LTTNG_TRIGGER_STATUS_OK; - const struct lttng_credentials *creds = NULL; - - if (!trigger || !uid ) { - ret = LTTNG_TRIGGER_STATUS_INVALID; - goto end; - } - - if (!trigger->creds.uid.is_set ) { - ret = LTTNG_TRIGGER_STATUS_UNSET; - goto end; - } - - creds = lttng_trigger_get_credentials(trigger); - *uid = lttng_credentials_get_uid(creds); - -end: - return ret; -} - -enum lttng_domain_type lttng_trigger_get_underlying_domain_type_restriction( - const struct lttng_trigger *trigger) -{ - enum lttng_domain_type type = LTTNG_DOMAIN_NONE; - const struct lttng_event_rule *event_rule; - enum lttng_condition_status c_status; - enum lttng_condition_type c_type; - - LTTNG_ASSERT(trigger); - LTTNG_ASSERT(trigger->condition); - - c_type = lttng_condition_get_type(trigger->condition); - assert (c_type != LTTNG_CONDITION_TYPE_UNKNOWN); - - switch (c_type) { - case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE: - case LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING: - case LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED: - /* Apply to any domain. */ - type = LTTNG_DOMAIN_NONE; - break; - case LTTNG_CONDITION_TYPE_EVENT_RULE_MATCHES: - /* Return the domain of the event rule. */ - c_status = lttng_condition_event_rule_matches_get_rule( - trigger->condition, &event_rule); - LTTNG_ASSERT(c_status == LTTNG_CONDITION_STATUS_OK); - type = lttng_event_rule_get_domain_type(event_rule); - break; - case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: - case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: - /* Return the domain of the channel being monitored. */ - c_status = lttng_condition_buffer_usage_get_domain_type( - trigger->condition, &type); - LTTNG_ASSERT(c_status == LTTNG_CONDITION_STATUS_OK); - break; - default: - abort(); - } - - return type; -} - -/* - * Generate bytecode related to the trigger. - * On success LTTNG_OK. On error, returns lttng_error code. - */ -enum lttng_error_code lttng_trigger_generate_bytecode( - struct lttng_trigger *trigger, - const struct lttng_credentials *creds) -{ - enum lttng_error_code ret; - struct lttng_condition *condition = NULL; - - condition = lttng_trigger_get_condition(trigger); - if (!condition) { - ret = LTTNG_ERR_INVALID_TRIGGER; - goto end; - } - - switch (lttng_condition_get_type(condition)) { - case LTTNG_CONDITION_TYPE_EVENT_RULE_MATCHES: - { - struct lttng_event_rule *event_rule; - const enum lttng_condition_status condition_status = - lttng_condition_event_rule_matches_borrow_rule_mutable( - condition, &event_rule); - - LTTNG_ASSERT(condition_status == LTTNG_CONDITION_STATUS_OK); - - /* Generate the filter bytecode. */ - ret = lttng_event_rule_generate_filter_bytecode( - event_rule, creds); - if (ret != LTTNG_OK) { - goto end; - } - - /* Generate the capture bytecode. */ - ret = lttng_condition_event_rule_matches_generate_capture_descriptor_bytecode( - condition); - if (ret != LTTNG_OK) { - goto end; - } - - ret = LTTNG_OK; - break; - } - default: - ret = LTTNG_OK; - break; - } -end: - return ret; -} - -struct lttng_trigger *lttng_trigger_copy(const struct lttng_trigger *trigger) -{ - int ret; - struct lttng_payload copy_buffer; - struct lttng_condition *condition_copy = NULL; - struct lttng_action *action_copy = NULL; - struct lttng_trigger *copy = NULL; - enum lttng_trigger_status trigger_status; - const char *trigger_name; - uid_t trigger_owner_uid; - - lttng_payload_init(©_buffer); - - ret = lttng_condition_serialize(trigger->condition, ©_buffer); - if (ret < 0) { - goto end; - } - - { - struct lttng_payload_view view = - lttng_payload_view_from_payload( - ©_buffer, 0, -1); - - ret = lttng_condition_create_from_payload( - &view, &condition_copy); - if (ret < 0) { - goto end; - } - } - - lttng_payload_clear(©_buffer); - - ret = lttng_action_serialize(trigger->action, ©_buffer); - if (ret < 0) { - goto end; - } - - { - struct lttng_payload_view view = - lttng_payload_view_from_payload( - ©_buffer, 0, -1); - - ret = lttng_action_create_from_payload( - &view, &action_copy); - if (ret < 0) { - goto end; - } - } - - copy = lttng_trigger_create(condition_copy, action_copy); - if (!copy) { - ERR("Failed to allocate trigger during trigger copy"); - goto end; - } - - trigger_status = lttng_trigger_get_name(trigger, &trigger_name); - switch (trigger_status) { - case LTTNG_TRIGGER_STATUS_OK: - trigger_status = lttng_trigger_set_name(copy, trigger_name); - if (trigger_status != LTTNG_TRIGGER_STATUS_OK) { - ERR("Failed to set name of new trigger during copy"); - goto error_cleanup_trigger; - } - break; - case LTTNG_TRIGGER_STATUS_UNSET: - break; - default: - ERR("Failed to get name of original trigger during copy"); - goto error_cleanup_trigger; - } - - trigger_status = lttng_trigger_get_owner_uid( - trigger, &trigger_owner_uid); - switch (trigger_status) { - case LTTNG_TRIGGER_STATUS_OK: - LTTNG_OPTIONAL_SET(©->creds.uid, trigger_owner_uid); - break; - case LTTNG_TRIGGER_STATUS_UNSET: - break; - default: - ERR("Failed to get owner uid of original trigger during copy"); - goto error_cleanup_trigger; - } - - copy->tracer_token = trigger->tracer_token; - copy->registered = trigger->registered; - copy->is_hidden = trigger->is_hidden; - goto end; - -error_cleanup_trigger: - lttng_trigger_destroy(copy); - copy = NULL; -end: - lttng_condition_put(condition_copy); - lttng_action_put(action_copy); - lttng_payload_reset(©_buffer); - return copy; -} - -bool lttng_trigger_needs_tracer_notifier(const struct lttng_trigger *trigger) -{ - bool needs_tracer_notifier = false; - const struct lttng_condition *condition = - lttng_trigger_get_const_condition(trigger); - - switch (lttng_condition_get_type(condition)) { - case LTTNG_CONDITION_TYPE_EVENT_RULE_MATCHES: - needs_tracer_notifier = true; - goto end; - case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE: - case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: - case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: - case LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING: - case LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED: - goto end; - case LTTNG_CONDITION_TYPE_UNKNOWN: - default: - abort(); - } -end: - return needs_tracer_notifier; -} - -void lttng_trigger_set_as_registered(struct lttng_trigger *trigger) -{ - pthread_mutex_lock(&trigger->lock); - trigger->registered = true; - pthread_mutex_unlock(&trigger->lock); -} - -void lttng_trigger_set_as_unregistered(struct lttng_trigger *trigger) -{ - pthread_mutex_lock(&trigger->lock); - trigger->registered = false; - pthread_mutex_unlock(&trigger->lock); -} - -/* - * The trigger must be locked before calling lttng_trigger_registered. - * The lock is necessary since a trigger can be unregistered at anytime. - * Manipulations requiring that the trigger be registered must always acquire - * the trigger lock for the duration of the manipulation using - * `lttng_trigger_lock` and `lttng_trigger_unlock`. - */ -bool lttng_trigger_is_registered(struct lttng_trigger *trigger) -{ - ASSERT_LOCKED(trigger->lock); - return trigger->registered; -} - -void lttng_trigger_lock(struct lttng_trigger *trigger) -{ - pthread_mutex_lock(&trigger->lock); -} - -void lttng_trigger_unlock(struct lttng_trigger *trigger) -{ - pthread_mutex_unlock(&trigger->lock); -} - -enum lttng_error_code lttng_trigger_mi_serialize(const struct lttng_trigger *trigger, - struct mi_writer *writer, - const struct mi_lttng_error_query_callbacks - *error_query_callbacks) -{ - int ret; - enum lttng_error_code ret_code; - enum lttng_trigger_status trigger_status; - const struct lttng_condition *condition = NULL; - const struct lttng_action *action = NULL; - struct lttng_dynamic_array action_path_indexes; - uid_t owner_uid; - - LTTNG_ASSERT(trigger); - LTTNG_ASSERT(writer); - - lttng_dynamic_array_init(&action_path_indexes, sizeof(uint64_t), NULL); - - /* Open trigger element. */ - ret = mi_lttng_writer_open_element(writer, mi_lttng_element_trigger); - if (ret) { - goto mi_error; - } - - trigger_status = lttng_trigger_get_owner_uid(trigger, &owner_uid); - LTTNG_ASSERT(trigger_status == LTTNG_TRIGGER_STATUS_OK); - - /* Name. */ - ret = mi_lttng_writer_write_element_string( - writer, config_element_name, trigger->name); - if (ret) { - goto mi_error; - } - - /* Owner uid. */ - ret = mi_lttng_writer_write_element_signed_int(writer, - mi_lttng_element_trigger_owner_uid, - (int64_t) owner_uid); - if (ret) { - goto mi_error; - } - - /* Condition. */ - condition = lttng_trigger_get_const_condition(trigger); - LTTNG_ASSERT(condition); - ret_code = lttng_condition_mi_serialize( - trigger, condition, writer, error_query_callbacks); - if (ret_code != LTTNG_OK) { - goto end; - } - - /* Action. */ - action = lttng_trigger_get_const_action(trigger); - LTTNG_ASSERT(action); - ret_code = lttng_action_mi_serialize(trigger, action, writer, - error_query_callbacks, &action_path_indexes); - if (ret_code != LTTNG_OK) { - goto end; - } - - if (error_query_callbacks && error_query_callbacks->trigger_cb) { - struct lttng_error_query_results *results = NULL; - - ret_code = error_query_callbacks->trigger_cb(trigger, &results); - if (ret_code != LTTNG_OK) { - goto end; - } - - ret_code = lttng_error_query_results_mi_serialize( - results, writer); - lttng_error_query_results_destroy(results); - if (ret_code != LTTNG_OK) { - goto end; - } - } - - /* Close trigger element. */ - ret = mi_lttng_writer_close_element(writer); - if (ret) { - goto mi_error; - } - - ret_code = LTTNG_OK; - goto end; - -mi_error: - ret_code = LTTNG_ERR_MI_IO_FAIL; -end: - lttng_dynamic_array_reset(&action_path_indexes); - return ret_code; -} - -/* Used by qsort, which expects the semantics of strcmp(). */ -static int compare_triggers_by_name(const void *a, const void *b) -{ - const struct lttng_trigger *trigger_a = - *((const struct lttng_trigger **) a); - const struct lttng_trigger *trigger_b = - *((const struct lttng_trigger **) b); - const char *name_a, *name_b; - enum lttng_trigger_status trigger_status; - - /* Anonymous triggers are not reachable here. */ - trigger_status = lttng_trigger_get_name(trigger_a, &name_a); - LTTNG_ASSERT(trigger_status == LTTNG_TRIGGER_STATUS_OK); - - trigger_status = lttng_trigger_get_name(trigger_b, &name_b); - LTTNG_ASSERT(trigger_status == LTTNG_TRIGGER_STATUS_OK); - - return strcmp(name_a, name_b); -} - -enum lttng_error_code lttng_triggers_mi_serialize(const struct lttng_triggers *triggers, - struct mi_writer *writer, - const struct mi_lttng_error_query_callbacks - *error_query_callbacks) -{ - int ret; - enum lttng_error_code ret_code; - enum lttng_trigger_status status; - unsigned int count, i; - struct lttng_dynamic_pointer_array sorted_triggers; - - LTTNG_ASSERT(triggers); - LTTNG_ASSERT(writer); - - /* - * Sort trigger by name to ensure an order at the MI level and ignore - * any anonymous trigger present. - */ - lttng_dynamic_pointer_array_init(&sorted_triggers, NULL); - - status = lttng_triggers_get_count(triggers, &count); - LTTNG_ASSERT(status == LTTNG_TRIGGER_STATUS_OK); - - for (i = 0; i < count; i++) { - int add_ret; - const char *unused_name; - const struct lttng_trigger *trigger = - lttng_triggers_get_at_index(triggers, i); - - status = lttng_trigger_get_name(trigger, &unused_name); - switch (status) { - case LTTNG_TRIGGER_STATUS_OK: - break; - case LTTNG_TRIGGER_STATUS_UNSET: - /* Don't list anonymous triggers. */ - continue; - default: - abort(); - } - - add_ret = lttng_dynamic_pointer_array_add_pointer( - &sorted_triggers, (void *) trigger); - - if (add_ret) { - ERR("Failed to lttng_trigger to sorting array."); - ret_code = LTTNG_ERR_NOMEM; - goto error; - } - } - - qsort(sorted_triggers.array.buffer.data, count, - sizeof(struct lttng_trigger *), - compare_triggers_by_name); - - /* Open triggers element. */ - ret = mi_lttng_writer_open_element(writer, mi_lttng_element_triggers); - if (ret) { - ret_code = LTTNG_ERR_MI_IO_FAIL; - goto error; - } - - for (i = 0; i < lttng_dynamic_pointer_array_get_count(&sorted_triggers); i++) { - const struct lttng_trigger *trigger = - (const struct lttng_trigger *) - lttng_dynamic_pointer_array_get_pointer( - &sorted_triggers, i); - - lttng_trigger_mi_serialize(trigger, writer, error_query_callbacks); - } - - /* Close triggers element. */ - ret = mi_lttng_writer_close_element(writer); - if (ret) { - ret_code = LTTNG_ERR_MI_IO_FAIL; - goto error; - } - - ret_code = LTTNG_OK; - -error: - lttng_dynamic_pointer_array_reset(&sorted_triggers); - return ret_code; -}