#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 <lttng/action/action.h>
#include <lttng/channel.h>
#include <lttng/channel-internal.h>
cds_lfht_for_each_entry (
agt->events->ht, &iter.iter, agent_event, node.node) {
struct lttng_event event = {
- .enabled = agent_event->enabled,
+ .enabled = AGENT_EVENT_IS_ENABLED(agent_event),
.loglevel = agent_event->loglevel_value,
.loglevel_type = agent_event->loglevel_type,
};
- strncpy(event.name, agent_event->name, sizeof(event.name));
- event.name[sizeof(event.name) - 1] = '\0';
+ ret = lttng_strncpy(event.name, agent_event->name, sizeof(event.name));
+ if (ret) {
+ /* Internal error, invalid name. */
+ ERR("Invalid event name while listing agent events: '%s' exceeds the maximal allowed length of %zu bytes",
+ agent_event->name, sizeof(event.name));
+ ret = -LTTNG_ERR_UNK;
+ goto end;
+ }
ret = lttng_dynamic_buffer_append(
&payload->buffer, &event, sizeof(event));
continue;
}
- strncpy(event.name, uevent->attr.name, sizeof(event.name));
- event.name[sizeof(event.name) - 1] = '\0';
+ ret = lttng_strncpy(event.name, uevent->attr.name, sizeof(event.name));
+ if (ret) {
+ /* Internal error, invalid name. */
+ ERR("Invalid event name while listing user space tracer events: '%s' exceeds the maximal allowed length of %zu bytes",
+ uevent->attr.name, sizeof(event.name));
+ ret = -LTTNG_ERR_UNK;
+ goto end;
+ }
event.enabled = uevent->enabled;
cds_list_for_each_entry(kevent, &kchan->events_list.head , list) {
struct lttng_event event = {};
- strncpy(event.name, kevent->event->name, sizeof(event.name));
- event.name[sizeof(event.name) - 1] = '\0';
+ ret = lttng_strncpy(event.name, kevent->event->name, sizeof(event.name));
+ if (ret) {
+ /* Internal error, invalid name. */
+ ERR("Invalid event name while listing kernel events: '%s' exceeds the maximal allowed length of %zu bytes",
+ kevent->event->name,
+ sizeof(event.name));
+ ret = -LTTNG_ERR_UNK;
+ goto end;
+ }
+
event.enabled = kevent->enabled;
event.filter = (unsigned char) !!kevent->filter_expression;
return ret;
}
-int cmd_register_trigger(struct command_ctx *cmd_ctx, int sock,
- struct notification_thread_handle *notification_thread,
- struct lttng_trigger **return_trigger)
+static enum lttng_error_code trigger_modifies_event_notifier(
+ const struct lttng_trigger *trigger, bool *adds_event_notifier)
{
- int ret;
- size_t trigger_len;
- ssize_t sock_recv_len;
- struct lttng_trigger *trigger = NULL;
- struct lttng_payload trigger_payload;
- struct lttng_credentials cmd_creds = {
- .uid = LTTNG_OPTIONAL_INIT_VALUE(cmd_ctx->creds.uid),
- .gid = LTTNG_OPTIONAL_INIT_VALUE(cmd_ctx->creds.gid),
- };
+ enum lttng_error_code ret_code = LTTNG_OK;
+ const struct lttng_condition *condition = NULL;
- lttng_payload_init(&trigger_payload);
- trigger_len = (size_t) cmd_ctx->lsm.u.trigger.length;
- ret = lttng_dynamic_buffer_set_size(
- &trigger_payload.buffer, trigger_len);
- if (ret) {
- ret = LTTNG_ERR_NOMEM;
+ condition = lttng_trigger_get_const_condition(trigger);
+ if (!condition) {
+ ret_code = LTTNG_ERR_INVALID_TRIGGER;
goto end;
}
- sock_recv_len = lttcomm_recv_unix_sock(
- sock, trigger_payload.buffer.data, trigger_len);
- if (sock_recv_len < 0 || sock_recv_len != trigger_len) {
- ERR("Failed to receive \"register trigger\" command payload");
- /* TODO: should this be a new error enum ? */
- ret = LTTNG_ERR_INVALID_TRIGGER;
- goto end;
- }
+ *adds_event_notifier = lttng_condition_get_type(condition) ==
+ LTTNG_CONDITION_TYPE_EVENT_RULE_HIT;
+end:
+ return ret_code;
+}
- /* Receive fds, if any. */
- if (cmd_ctx->lsm.fd_count > 0) {
- ret = lttcomm_recv_payload_fds_unix_sock(
- sock, cmd_ctx->lsm.fd_count, &trigger_payload);
- if (ret > 0 && ret != cmd_ctx->lsm.fd_count * sizeof(int)) {
- ret = LTTNG_ERR_INVALID_PROTOCOL;
- goto end;
- } else if (ret <= 0) {
- ret = LTTNG_ERR_FATAL;
- goto end;
- }
- }
+enum lttng_error_code cmd_register_trigger(const struct lttng_credentials *cmd_creds,
+ struct lttng_trigger *trigger,
+ struct notification_thread_handle *notification_thread,
+ 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;
- /* Deserialize trigger. */
- {
- struct lttng_payload_view view =
- lttng_payload_view_from_payload(
- &trigger_payload, 0, -1);
-
- if (lttng_trigger_create_from_payload(&view, &trigger) !=
- trigger_len) {
- ERR("Invalid trigger payload received in \"register trigger\" command");
- ret = LTTNG_ERR_INVALID_TRIGGER;
- goto end;
- }
- }
+ 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);
+ assert(trigger_status == LTTNG_TRIGGER_STATUS_OK);
+
+ DBG("Running register trigger 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.
*/
if (!lttng_credentials_is_equal_uid(
lttng_trigger_get_credentials(trigger),
- &cmd_creds)) {
- if (lttng_credentials_get_uid(&cmd_creds) != 0) {
- ERR("Trigger credentials do not match the command credentials");
- ret = LTTNG_ERR_INVALID_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;
}
}
+ /*
+ * The bytecode generation also serves as a validation step for the
+ * bytecode expressions.
+ */
+ ret_code = lttng_trigger_generate_bytecode(trigger, cmd_creds);
+ if (ret_code != LTTNG_OK) {
+ ERR("Failed to generate bytecode of trigger: trigger name = '%s', trigger owner uid = %d, error code = %d",
+ trigger_name, (int) trigger_owner, ret_code);
+ goto end;
+ }
+
/*
* A reference to the trigger is acquired by the notification thread.
* It is safe to return the same trigger to the caller since it the
* it is safe to use without any locking as its properties are
* immutable.
*/
- ret = notification_thread_command_register_trigger(notification_thread,
+ ret_code = notification_thread_command_register_trigger(notification_thread,
trigger);
- if (ret != LTTNG_OK) {
- goto end_notification_thread;
+ if (ret_code != LTTNG_OK) {
+ DBG("Failed to register trigger to notification thread: trigger name = '%s', trigger owner uid = %d, error code = %d",
+ trigger_name, (int) trigger_owner, ret_code);
+ goto end;
}
- /* Return an updated trigger to the client. */
- *return_trigger = trigger;
-
-end_notification_thread:
- /* Ownership of trigger was transferred. */
- trigger = NULL;
-end:
- lttng_trigger_destroy(trigger);
- lttng_payload_reset(&trigger_payload);
- return ret;
-}
-
-int cmd_unregister_trigger(struct command_ctx *cmd_ctx, int sock,
- struct notification_thread_handle *notification_thread)
-{
- int ret;
- size_t trigger_len;
- ssize_t sock_recv_len;
- struct lttng_trigger *trigger = NULL;
- struct lttng_payload trigger_payload;
- struct lttng_credentials cmd_creds = {
- .uid = LTTNG_OPTIONAL_INIT_VALUE(cmd_ctx->creds.uid),
- .gid = LTTNG_OPTIONAL_INIT_VALUE(cmd_ctx->creds.gid),
- };
+ trigger_status = lttng_trigger_get_name(trigger, &trigger_name);
+ trigger_name = trigger_status == LTTNG_TRIGGER_STATUS_OK ?
+ trigger_name : "(unnamed)";
- lttng_payload_init(&trigger_payload);
- trigger_len = (size_t) cmd_ctx->lsm.u.trigger.length;
- ret = lttng_dynamic_buffer_set_size(
- &trigger_payload.buffer, trigger_len);
- if (ret) {
- ret = LTTNG_ERR_NOMEM;
+ 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;
}
- sock_recv_len = lttcomm_recv_unix_sock(
- sock, trigger_payload.buffer.data, trigger_len);
- if (sock_recv_len < 0 || sock_recv_len != trigger_len) {
- ERR("Failed to receive \"unregister trigger\" command payload");
- /* TODO: should this be a new error enum ? */
- ret = LTTNG_ERR_INVALID_TRIGGER;
- 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);
- /* Receive fds, if any. */
- if (cmd_ctx->lsm.fd_count > 0) {
- ret = lttcomm_recv_payload_fds_unix_sock(
- sock, cmd_ctx->lsm.fd_count, &trigger_payload);
- if (ret > 0 && ret != cmd_ctx->lsm.fd_count * sizeof(int)) {
- ret = LTTNG_ERR_INVALID_PROTOCOL;
- goto end;
- } else if (ret <= 0) {
- ret = LTTNG_ERR_FATAL;
- goto end;
+ 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);
- {
- struct lttng_payload_view view =
- lttng_payload_view_from_payload(
- &trigger_payload, 0, -1);
-
- if (lttng_trigger_create_from_payload(&view, &trigger) !=
- trigger_len) {
- ERR("Invalid trigger payload received in \"unregister trigger\" command");
- ret = LTTNG_ERR_INVALID_TRIGGER;
- goto end;
+ 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;
}
+ }
+
+ session_unlock_list();
}
+ /*
+ * Return an updated trigger to the client.
+ *
+ * Since a modified version of the same trigger is returned, acquire a
+ * reference to the trigger so the caller doesn't have to care if those
+ * are distinct instances or not.
+ */
+ if (ret_code == LTTNG_OK) {
+ lttng_trigger_get(trigger);
+ *return_trigger = trigger;
+ /* Ownership of trigger was transferred to caller. */
+ trigger = NULL;
+ }
+end:
+ return ret_code;
+end_unlock_session_list:
+ session_unlock_list();
+ return ret_code;
+}
+
+enum lttng_error_code cmd_unregister_trigger(const struct lttng_credentials *cmd_creds,
+ const struct lttng_trigger *trigger,
+ 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;
+
+ 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);
+ assert(trigger_status == LTTNG_TRIGGER_STATUS_OK);
+
+ DBG("Running unregister trigger 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 unregister a trigger with non-matching
*/
if (!lttng_credentials_is_equal_uid(
lttng_trigger_get_credentials(trigger),
- &cmd_creds)) {
- if (lttng_credentials_get_uid(&cmd_creds) != 0) {
- ERR("Trigger credentials do not match the command credentials");
- ret = LTTNG_ERR_INVALID_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;
}
}
- ret = notification_thread_command_unregister_trigger(notification_thread,
- trigger);
+ 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;
+ }
+
+ 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);
+ }
+
+ /*
+ * Synchronize tracers if the trigger removes an event notifier.
+ * Do this even if the trigger unregistration failed to at least stop
+ * 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;
+ }
+ }
+
+ session_unlock_list();
+ }
+
+end:
+ 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,
+ struct lttng_triggers **return_triggers)
+{
+ int ret = 0;
+ enum lttng_error_code ret_code;
+ struct lttng_triggers *triggers = NULL;
+
+ /* Get the set of triggers from the notification thread. */
+ ret_code = notification_thread_command_list_triggers(
+ notification_thread, cmd_ctx->creds.uid, &triggers);
+ if (ret_code != LTTNG_OK) {
+ ret = ret_code;
+ goto end;
+ }
+
+ *return_triggers = triggers;
+ triggers = NULL;
+ ret = LTTNG_OK;
end:
- lttng_trigger_destroy(trigger);
- lttng_payload_reset(&trigger_payload);
+ lttng_triggers_destroy(triggers);
return ret;
}
-
/*
* Send relayd sockets from snapshot output to consumer. Ignore request if the
* snapshot output is *not* set with a remote destination.
projects / lttng-tools.git / blobdiff