X-Git-Url: https://git.liburcu.org/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fcommon%2Ftrigger.c;h=d740c80c77a377f8ff1a9a7141f6e7682e67cb62;hp=785fce3fcf0271e66a3d11a2777905dba3bd04fc;hb=a5c2d2a71919b8d1542b62f6d32579125cc2c8f8;hpb=3e6e0df2f8f9f23d252c2508b6d741916dfcc4b3 diff --git a/src/common/trigger.c b/src/common/trigger.c index 785fce3fc..d740c80c7 100644 --- a/src/common/trigger.c +++ b/src/common/trigger.c @@ -5,20 +5,27 @@ * */ -#include -#include -#include +#include #include -#include -#include -#include #include +#include #include -#include +#include +#include #include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include LTTNG_HIDDEN -bool lttng_trigger_validate(struct lttng_trigger *trigger) +bool lttng_trigger_validate(const struct lttng_trigger *trigger) { bool valid; @@ -61,6 +68,9 @@ struct lttng_trigger *lttng_trigger_create( lttng_action_get(action); trigger->action = action; + pthread_mutex_init(&trigger->lock, NULL); + trigger->registered = false; + end: return trigger; } @@ -76,14 +86,12 @@ struct lttng_condition *lttng_trigger_get_condition( return trigger ? trigger->condition : NULL; } -LTTNG_HIDDEN const struct lttng_condition *lttng_trigger_get_const_condition( const struct lttng_trigger *trigger) { - return trigger->condition; + 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 @@ -95,11 +103,10 @@ struct lttng_action *lttng_trigger_get_action( return trigger ? trigger->action : NULL; } -LTTNG_HIDDEN const struct lttng_action *lttng_trigger_get_const_action( const struct lttng_trigger *trigger) { - return trigger->action; + return trigger ? trigger->action : NULL; } static void trigger_destroy_ref(struct urcu_ref *ref) @@ -117,6 +124,8 @@ static void trigger_destroy_ref(struct urcu_ref *ref) lttng_action_put(action); lttng_condition_put(condition); + pthread_mutex_destroy(&trigger->lock); + free(trigger->name); free(trigger); } @@ -129,7 +138,7 @@ void lttng_trigger_destroy(struct lttng_trigger *trigger) LTTNG_HIDDEN ssize_t lttng_trigger_create_from_payload( struct lttng_payload_view *src_view, - struct lttng_trigger **trigger) + struct lttng_trigger **_trigger) { ssize_t ret, offset = 0, condition_size, action_size, name_size = 0; struct lttng_condition *condition = NULL; @@ -140,11 +149,12 @@ ssize_t lttng_trigger_create_from_payload( .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) { + if (!src_view || !_trigger) { ret = -1; goto end; } @@ -229,13 +239,13 @@ ssize_t lttng_trigger_create_from_payload( goto error; } - *trigger = lttng_trigger_create(condition, action); - if (!*trigger) { + trigger = lttng_trigger_create(condition, action); + if (!trigger) { ret = -1; goto error; } - lttng_trigger_set_credentials(*trigger, &creds); + lttng_trigger_set_credentials(trigger, &creds); /* * The trigger object owns references to the action and condition @@ -249,7 +259,7 @@ ssize_t lttng_trigger_create_from_payload( if (name) { const enum lttng_trigger_status status = - lttng_trigger_set_name(*trigger, name); + lttng_trigger_set_name(trigger, name); if (status != LTTNG_TRIGGER_STATUS_OK) { ret = -1; @@ -260,9 +270,15 @@ ssize_t lttng_trigger_create_from_payload( ret = offset; error: - lttng_condition_destroy(condition); - lttng_action_destroy(action); + lttng_condition_put(condition); + lttng_action_put(action); end: + if (ret >= 0) { + *_trigger = trigger; + } else { + lttng_trigger_put(trigger); + } + return ret; } @@ -330,9 +346,15 @@ LTTNG_HIDDEN bool lttng_trigger_is_equal( const struct lttng_trigger *a, const struct lttng_trigger *b) { - /* - * Name is not taken into account since it is cosmetic only. - */ + 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; } @@ -349,22 +371,24 @@ bool lttng_trigger_is_equal( return true; } +LTTNG_HIDDEN 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 || !name || - strlen(name) == 0) { + if (!trigger) { status = LTTNG_TRIGGER_STATUS_INVALID; goto end; } - name_copy = strdup(name); - if (!name_copy) { - status = LTTNG_TRIGGER_STATUS_ERROR; - goto end; + if (name) { + name_copy = strdup(name); + if (!name_copy) { + status = LTTNG_TRIGGER_STATUS_ERROR; + goto end; + } } free(trigger->name); @@ -687,6 +711,7 @@ 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, @@ -698,7 +723,7 @@ enum lttng_trigger_status lttng_trigger_set_owner_uid( } /* Client-side validation only to report a clearer error. */ - if (geteuid() != 0) { + if (euid != 0 && euid != uid) { ret = LTTNG_TRIGGER_STATUS_PERMISSION_DENIED; goto end; } @@ -731,3 +756,265 @@ enum lttng_trigger_status lttng_trigger_get_owner_uid( end: return ret; } + +LTTNG_HIDDEN +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; + + assert(trigger); + 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); + 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); + 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. + */ +LTTNG_HIDDEN +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); + + 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; +} + +LTTNG_HIDDEN +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; + 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; +} + +LTTNG_HIDDEN +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; +} + +LTTNG_HIDDEN +void lttng_trigger_set_as_registered(struct lttng_trigger *trigger) +{ + pthread_mutex_lock(&trigger->lock); + trigger->registered = true; + pthread_mutex_unlock(&trigger->lock); +} + +LTTNG_HIDDEN +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`. + */ +LTTNG_HIDDEN +bool lttng_trigger_is_registered(struct lttng_trigger *trigger) +{ + ASSERT_LOCKED(trigger->lock); + return trigger->registered; +} + +LTTNG_HIDDEN +void lttng_trigger_lock(struct lttng_trigger *trigger) +{ + pthread_mutex_lock(&trigger->lock); +} + +LTTNG_HIDDEN +void lttng_trigger_unlock(struct lttng_trigger *trigger) +{ + pthread_mutex_unlock(&trigger->lock); +}