*
*/
+
#define _LGPL_SOURCE
#include <assert.h>
#include <inttypes.h>
+#include <stdio.h>
+#include <sys/stat.h>
#include <urcu/list.h>
#include <urcu/uatomic.h>
-#include <sys/stat.h>
-#include <stdio.h>
-#include <common/defaults.h>
+#include <common/buffer-view.h>
#include <common/common.h>
-#include <common/sessiond-comm/sessiond-comm.h>
-#include <common/relayd/relayd.h>
-#include <common/utils.h>
#include <common/compat/string.h>
-#include <common/kernel-ctl/kernel-ctl.h>
+#include <common/defaults.h>
#include <common/dynamic-buffer.h>
-#include <common/buffer-view.h>
-#include <common/payload.h>
+#include <common/kernel-ctl/kernel-ctl.h>
#include <common/payload-view.h>
+#include <common/payload.h>
+#include <common/relayd/relayd.h>
+#include <common/sessiond-comm/sessiond-comm.h>
+#include <common/string-utils/string-utils.h>
#include <common/trace-chunk.h>
-#include <lttng/location-internal.h>
-#include <lttng/trigger/trigger-internal.h>
-#include <lttng/condition/condition.h>
-#include <lttng/condition/condition-internal.h>
-#include <lttng/condition/event-rule.h>
-#include <lttng/condition/event-rule-internal.h>
-#include <lttng/event-rule/event-rule.h>
-#include <lttng/event-rule/event-rule-internal.h>
+#include <common/utils.h>
+#include <lttng/action/action-internal.h>
#include <lttng/action/action.h>
-#include <lttng/channel.h>
#include <lttng/channel-internal.h>
-#include <lttng/rotate-internal.h>
+#include <lttng/channel.h>
+#include <lttng/condition/condition-internal.h>
+#include <lttng/condition/condition.h>
+#include <lttng/condition/on-event-internal.h>
+#include <lttng/condition/on-event.h>
+#include <lttng/error-query-internal.h>
+#include <lttng/event-rule/event-rule-internal.h>
+#include <lttng/event-rule/event-rule.h>
#include <lttng/location-internal.h>
-#include <lttng/session-internal.h>
-#include <lttng/userspace-probe-internal.h>
-#include <lttng/session-descriptor-internal.h>
#include <lttng/lttng-error.h>
+#include <lttng/rotate-internal.h>
+#include <lttng/session-descriptor-internal.h>
+#include <lttng/session-internal.h>
#include <lttng/tracker.h>
-#include <common/string-utils/string-utils.h>
+#include <lttng/trigger/trigger-internal.h>
+#include <lttng/userspace-probe-internal.h>
+#include "agent-thread.h"
+#include "agent.h"
+#include "buffer-registry.h"
#include "channel.h"
+#include "cmd.h"
#include "consumer.h"
+#include "event-notifier-error-accounting.h"
#include "event.h"
#include "health-sessiond.h"
-#include "kernel.h"
#include "kernel-consumer.h"
+#include "kernel.h"
#include "lttng-sessiond.h"
-#include "utils.h"
#include "lttng-syscall.h"
-#include "agent.h"
-#include "buffer-registry.h"
-#include "notification-thread.h"
#include "notification-thread-commands.h"
+#include "notification-thread.h"
#include "rotate.h"
#include "rotation-thread.h"
+#include "session.h"
#include "timer.h"
-#include "agent-thread.h"
#include "tracker.h"
-
-#include "cmd.h"
+#include "utils.h"
/* Sleep for 100ms between each check for the shm path's deletion. */
#define SESSION_DESTROY_SHM_PATH_CHECK_DELAY_US 100000
return ret;
}
-static enum lttng_error_code trigger_modifies_event_notifier(
- const struct lttng_trigger *trigger, bool *adds_event_notifier)
+static
+enum lttng_error_code synchronize_tracer_notifier_register(
+ struct notification_thread_handle *notification_thread,
+ struct lttng_trigger *trigger, const struct lttng_credentials *cmd_creds)
{
- enum lttng_error_code ret_code = LTTNG_OK;
- const struct lttng_condition *condition = NULL;
+ enum lttng_error_code ret_code;
+ const struct lttng_condition *condition =
+ lttng_trigger_get_const_condition(trigger);
+ const char *trigger_name;
+ uid_t trigger_owner;
+ enum lttng_trigger_status trigger_status;
+ const enum lttng_domain_type trigger_domain =
+ lttng_trigger_get_underlying_domain_type_restriction(
+ trigger);
- condition = lttng_trigger_get_const_condition(trigger);
- if (!condition) {
- ret_code = LTTNG_ERR_INVALID_TRIGGER;
- goto end;
+ trigger_status = lttng_trigger_get_owner_uid(trigger, &trigger_owner);
+ assert(trigger_status == LTTNG_TRIGGER_STATUS_OK);
+
+ assert(condition);
+ assert(lttng_condition_get_type(condition) == LTTNG_CONDITION_TYPE_ON_EVENT);
+
+ trigger_status = lttng_trigger_get_name(trigger, &trigger_name);
+ trigger_name = trigger_status == LTTNG_TRIGGER_STATUS_OK ?
+ trigger_name :
+ "(unnamed)";
+
+ session_lock_list();
+ switch (trigger_domain) {
+ case LTTNG_DOMAIN_KERNEL:
+ {
+ ret_code = kernel_register_event_notifier(trigger, cmd_creds);
+ if (ret_code != LTTNG_OK) {
+ enum lttng_error_code notif_thread_unregister_ret;
+
+ notif_thread_unregister_ret =
+ notification_thread_command_unregister_trigger(
+ notification_thread, trigger);
+
+ if (notif_thread_unregister_ret != LTTNG_OK) {
+ /* Return the original error code. */
+ ERR("Failed to unregister trigger from notification thread during error recovery: trigger name = '%s', trigger owner uid = %d, error code = %d",
+ trigger_name,
+ (int) trigger_owner,
+ ret_code);
+ }
+ }
+ break;
+ }
+ case LTTNG_DOMAIN_UST:
+ ust_app_global_update_all_event_notifier_rules();
+ break;
+ case LTTNG_DOMAIN_JUL:
+ case LTTNG_DOMAIN_LOG4J:
+ case LTTNG_DOMAIN_PYTHON:
+ {
+ /* Agent domains. */
+ struct agent *agt = agent_find_by_event_notifier_domain(
+ trigger_domain);
+
+ if (!agt) {
+ agt = agent_create(trigger_domain);
+ if (!agt) {
+ ret_code = LTTNG_ERR_NOMEM;
+ goto end_unlock_session_list;
+ }
+
+ agent_add(agt, the_trigger_agents_ht_by_domain);
+ }
+
+ ret_code = trigger_agent_enable(trigger, agt);
+ if (ret_code != LTTNG_OK) {
+ goto end_unlock_session_list;
+ }
+
+ break;
+ }
+ case LTTNG_DOMAIN_NONE:
+ default:
+ abort();
}
- *adds_event_notifier = lttng_condition_get_type(condition) ==
- LTTNG_CONDITION_TYPE_EVENT_RULE_HIT;
-end:
+ ret_code = LTTNG_OK;
+end_unlock_session_list:
+ session_unlock_list();
return ret_code;
}
struct lttng_trigger **return_trigger)
{
enum lttng_error_code ret_code;
- bool must_update_event_notifiers;
const char *trigger_name;
uid_t trigger_owner;
enum lttng_trigger_status trigger_status;
trigger_name = trigger_status == LTTNG_TRIGGER_STATUS_OK ?
trigger_name : "(unnamed)";
- ret_code = trigger_modifies_event_notifier(trigger, &must_update_event_notifiers);
- if (ret_code != LTTNG_OK) {
- ERR("Failed to determine if event modifies event notifiers: trigger name = '%s', trigger owner uid = %d, error code = %d",
- trigger_name, (int) trigger_owner, ret_code);
- goto end;
- }
-
/*
* Synchronize tracers if the trigger adds an event notifier.
*/
- if (must_update_event_notifiers) {
- const enum lttng_domain_type trigger_domain =
- lttng_trigger_get_underlying_domain_type_restriction(trigger);
-
- session_lock_list();
- switch (trigger_domain) {
- case LTTNG_DOMAIN_KERNEL:
- {
- ret_code = kernel_register_event_notifier(
- trigger, cmd_creds);
- if (ret_code != LTTNG_OK) {
- const enum lttng_error_code notif_thread_unregister_ret =
- notification_thread_command_unregister_trigger(
- notification_thread,
- trigger);
-
- if (notif_thread_unregister_ret != LTTNG_OK) {
- /* Return the original error code. */
- ERR("Failed to unregister trigger from notification thread during error recovery: trigger name = '%s', trigger owner uid = %d, error code = %d",
- trigger_name,
- (int) trigger_owner,
- ret_code);
- }
- }
- break;
- }
- case LTTNG_DOMAIN_UST:
- ust_app_global_update_all_event_notifier_rules();
- break;
- case LTTNG_DOMAIN_NONE:
- abort();
- default:
- {
- /* Agent domains. */
- struct agent *agt = agent_find_by_event_notifier_domain(
- trigger_domain);
-
- if (!agt) {
- agt = agent_create(trigger_domain);
- if (!agt) {
- ret_code = LTTNG_ERR_NOMEM;
- goto end_unlock_session_list;
- }
- agent_add(agt, trigger_agents_ht_by_domain);
- }
-
- ret_code = trigger_agent_enable(trigger, agt);
- if (ret_code != LTTNG_OK) {
- goto end_unlock_session_list;
- }
-
- break;
- }
+ if (lttng_trigger_needs_tracer_notifier(trigger)) {
+ ret_code = synchronize_tracer_notifier_register(notification_thread,
+ trigger, cmd_creds);
+ if (ret_code != LTTNG_OK) {
+ ERR("Error registering tracer notifier: %s",
+ lttng_strerror(-ret_code));
+ goto end;
}
-
- session_unlock_list();
}
/*
}
end:
return ret_code;
+}
+
+static
+enum lttng_error_code synchronize_tracer_notifier_unregister(
+ const struct lttng_trigger *trigger)
+{
+ enum lttng_error_code ret_code;
+ const struct lttng_condition *condition =
+ lttng_trigger_get_const_condition(trigger);
+ const enum lttng_domain_type trigger_domain =
+ lttng_trigger_get_underlying_domain_type_restriction(
+ trigger);
+
+ assert(condition);
+ assert(lttng_condition_get_type(condition) == LTTNG_CONDITION_TYPE_ON_EVENT);
+
+ session_lock_list();
+ switch (trigger_domain) {
+ case LTTNG_DOMAIN_KERNEL:
+ ret_code = kernel_unregister_event_notifier(trigger);
+ if (ret_code != LTTNG_OK) {
+ goto end_unlock_session_list;
+ }
+
+ break;
+ case LTTNG_DOMAIN_UST:
+ ust_app_global_update_all_event_notifier_rules();
+ break;
+ case LTTNG_DOMAIN_JUL:
+ case LTTNG_DOMAIN_LOG4J:
+ case LTTNG_DOMAIN_PYTHON:
+ {
+ /* Agent domains. */
+ struct agent *agt = agent_find_by_event_notifier_domain(
+ trigger_domain);
+
+ /*
+ * This trigger was never registered in the first place. Calling
+ * this function under those circumstances is an internal error.
+ */
+ assert(agt);
+ ret_code = trigger_agent_disable(trigger, agt);
+ if (ret_code != LTTNG_OK) {
+ goto end_unlock_session_list;
+ }
+
+ break;
+ }
+ case LTTNG_DOMAIN_NONE:
+ default:
+ abort();
+ }
+
+ ret_code = LTTNG_OK;
+
end_unlock_session_list:
session_unlock_list();
return ret_code;
struct notification_thread_handle *notification_thread)
{
enum lttng_error_code ret_code;
- bool must_update_event_notifiers;
const char *trigger_name;
uid_t trigger_owner;
enum lttng_trigger_status trigger_status;
+ struct lttng_trigger *sessiond_trigger = NULL;
trigger_status = lttng_trigger_get_name(trigger, &trigger_name);
trigger_name = trigger_status == LTTNG_TRIGGER_STATUS_OK ? trigger_name : "(unnamed)";
- trigger_status = lttng_trigger_get_owner_uid(
- trigger, &trigger_owner);
+ trigger_status = lttng_trigger_get_owner_uid(trigger, &trigger_owner);
assert(trigger_status == LTTNG_TRIGGER_STATUS_OK);
DBG("Running unregister trigger command: trigger name = '%s', trigger owner uid = %d, command creds uid = %d",
}
}
- ret_code = trigger_modifies_event_notifier(trigger, &must_update_event_notifiers);
+ /* Fetch the sessiond side trigger object. */
+ ret_code = notification_thread_command_get_trigger(
+ notification_thread, trigger, &sessiond_trigger);
if (ret_code != LTTNG_OK) {
- ERR("Failed to determine if event modifies event notifiers: trigger name = '%s', trigger owner uid = %d, error code = %d",
+ DBG("Failed to get trigger from notification thread during unregister: trigger name = '%s', trigger owner uid = %d, error code = %d",
trigger_name, (int) trigger_owner, ret_code);
goto end;
}
+ assert(sessiond_trigger);
+
+ /*
+ * From this point on, no matter what, consider the trigger
+ * unregistered.
+ *
+ * We set the unregistered state of the sessiond side trigger object in
+ * the client thread since we want to minimize the possibility of the
+ * notification thread being stalled due to a long execution of an
+ * action that required the trigger lock.
+ */
+ lttng_trigger_set_as_unregistered(sessiond_trigger);
+
ret_code = notification_thread_command_unregister_trigger(notification_thread,
trigger);
if (ret_code != LTTNG_OK) {
DBG("Failed to unregister trigger from notification thread: trigger name = '%s', trigger owner uid = %d, error code = %d",
trigger_name, (int) trigger_owner, ret_code);
+ goto end;
}
/*
* the tracers from producing notifications associated with this
* event notifier.
*/
- if (must_update_event_notifiers) {
- const enum lttng_domain_type trigger_domain =
- lttng_trigger_get_underlying_domain_type_restriction(
- trigger);
-
- session_lock_list();
- switch (trigger_domain) {
- case LTTNG_DOMAIN_KERNEL:
- {
- ret_code = kernel_unregister_event_notifier(
- trigger);
- break;
- }
- case LTTNG_DOMAIN_UST:
- ust_app_global_update_all_event_notifier_rules();
- break;
- case LTTNG_DOMAIN_NONE:
- abort();
- default:
- {
- /* Agent domains. */
- struct agent *agt = agent_find_by_event_notifier_domain(
- trigger_domain);
-
- if (!agt) {
- agt = agent_create(trigger_domain);
- if (!agt) {
- ret_code = LTTNG_ERR_NOMEM;
- goto end_unlock_session_list;
- }
- agent_add(agt, trigger_agents_ht_by_domain);
- }
-
- ret_code = trigger_agent_disable(trigger, agt);
- if (ret_code != LTTNG_OK) {
- goto end_unlock_session_list;
- }
-
- break;
- }
+ if (lttng_trigger_needs_tracer_notifier(trigger)) {
+ ret_code = synchronize_tracer_notifier_unregister(trigger);
+ if (ret_code != LTTNG_OK) {
+ ERR("Error unregistering trigger to tracer.");
+ goto end;
}
- session_unlock_list();
}
end:
+ lttng_trigger_put(sessiond_trigger);
return ret_code;
-end_unlock_session_list:
- session_unlock_list();
- return ret_code;}
+}
int cmd_list_triggers(struct command_ctx *cmd_ctx,
struct notification_thread_handle *notification_thread,
lttng_triggers_destroy(triggers);
return ret;
}
+
+enum lttng_error_code cmd_execute_error_query(const struct lttng_credentials *cmd_creds,
+ const struct lttng_error_query *query,
+ struct lttng_error_query_results **_results,
+ struct notification_thread_handle *notification_thread)
+{
+ enum lttng_error_code ret_code;
+ const struct lttng_trigger *query_target_trigger;
+ struct lttng_action *query_target_action = NULL;
+ struct lttng_trigger *matching_trigger = NULL;
+ const char *trigger_name;
+ uid_t trigger_owner;
+ enum lttng_trigger_status trigger_status;
+ struct lttng_error_query_results *results = NULL;
+
+ switch (lttng_error_query_get_target_type(query)) {
+ case LTTNG_ERROR_QUERY_TARGET_TYPE_TRIGGER:
+ query_target_trigger = lttng_error_query_trigger_borrow_target(query);
+ break;
+ case LTTNG_ERROR_QUERY_TARGET_TYPE_ACTION:
+ query_target_trigger = lttng_error_query_action_borrow_trigger_target(
+ query);
+ break;
+ default:
+ abort();
+ }
+
+ assert(query_target_trigger);
+
+ ret_code = notification_thread_command_get_trigger(notification_thread,
+ query_target_trigger, &matching_trigger);
+ if (ret_code != LTTNG_OK) {
+ goto end;
+ }
+
+ /* No longer needed. */
+ query_target_trigger = NULL;
+
+ if (lttng_error_query_get_target_type(query) ==
+ LTTNG_ERROR_QUERY_TARGET_TYPE_ACTION) {
+ /* Get the sessiond-side version of the target action. */
+ query_target_action =
+ lttng_error_query_action_borrow_action_target(
+ query, matching_trigger);
+ }
+
+ trigger_status = lttng_trigger_get_name(matching_trigger, &trigger_name);
+ trigger_name = trigger_status == LTTNG_TRIGGER_STATUS_OK ?
+ trigger_name : "(unnamed)";
+ trigger_status = lttng_trigger_get_owner_uid(matching_trigger,
+ &trigger_owner);
+ assert(trigger_status == LTTNG_TRIGGER_STATUS_OK);
+
+ results = lttng_error_query_results_create();
+ if (!results) {
+ ret_code = LTTNG_ERR_NOMEM;
+ goto end;
+ }
+
+ DBG("Running \"execute error query\" command: trigger name = '%s', trigger owner uid = %d, command creds uid = %d",
+ trigger_name, (int) trigger_owner,
+ (int) lttng_credentials_get_uid(cmd_creds));
+
+ /*
+ * Validate the trigger credentials against the command credentials.
+ * Only the root user can target a trigger with non-matching
+ * credentials.
+ */
+ if (!lttng_credentials_is_equal_uid(
+ lttng_trigger_get_credentials(matching_trigger),
+ cmd_creds)) {
+ if (lttng_credentials_get_uid(cmd_creds) != 0) {
+ ERR("Trigger credentials do not match the command credentials: trigger name = '%s', trigger owner uid = %d, command creds uid = %d",
+ trigger_name, (int) trigger_owner,
+ (int) lttng_credentials_get_uid(cmd_creds));
+ ret_code = LTTNG_ERR_INVALID_TRIGGER;
+ goto end;
+ }
+ }
+
+ switch (lttng_error_query_get_target_type(query)) {
+ case LTTNG_ERROR_QUERY_TARGET_TYPE_TRIGGER:
+ trigger_status = lttng_trigger_add_error_results(
+ matching_trigger, results);
+
+ switch (trigger_status) {
+ case LTTNG_TRIGGER_STATUS_OK:
+ break;
+ default:
+ ret_code = LTTNG_ERR_UNK;
+ goto end;
+ }
+
+ break;
+ case LTTNG_ERROR_QUERY_TARGET_TYPE_ACTION:
+ {
+ const enum lttng_action_status action_status =
+ lttng_action_add_error_query_results(
+ query_target_action, results);
+
+ switch (action_status) {
+ case LTTNG_ACTION_STATUS_OK:
+ break;
+ default:
+ ret_code = LTTNG_ERR_UNK;
+ goto end;
+ }
+
+ break;
+ }
+ default:
+ abort();
+ break;
+ }
+
+ *_results = results;
+ results = NULL;
+ ret_code = LTTNG_OK;
+end:
+ lttng_trigger_put(matching_trigger);
+ lttng_error_query_results_destroy(results);
+ return ret_code;
+}
+
/*
* Send relayd sockets from snapshot output to consumer. Ignore request if the
* snapshot output is *not* set with a remote destination.
chunk_being_archived = NULL;
if (!quiet_rotation) {
ret = notification_thread_command_session_rotation_ongoing(
- notification_thread_handle,
- session->name, session->uid, session->gid,
+ the_notification_thread_handle, session->name,
+ session->uid, session->gid,
ongoing_rotation_chunk_id);
if (ret != LTTNG_OK) {
ERR("Failed to notify notification thread that a session rotation is ongoing for session %s",