+++ /dev/null
-/*
- * Copyright (C) 2017 Jérémie Galarneau <jeremie.galarneau@efficios.com>
- *
- * SPDX-License-Identifier: LGPL-2.1-only
- *
- */
-
-#include <lttng/trigger/trigger-internal.h>
-#include <lttng/condition/condition-internal.h>
-#include <lttng/action/action-internal.h>
-#include <common/credentials.h>
-#include <common/payload.h>
-#include <common/payload-view.h>
-#include <common/error.h>
-#include <common/optional.h>
-#include <assert.h>
-
-LTTNG_HIDDEN
-bool lttng_trigger_validate(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;
-
-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;
-}
-
-LTTNG_HIDDEN
-const struct lttng_condition *lttng_trigger_get_const_condition(
- const struct lttng_trigger *trigger)
-{
- return trigger->condition;
-}
-
-
-/*
- * 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;
-}
-
-LTTNG_HIDDEN
-const struct lttng_action *lttng_trigger_get_const_action(
- const struct lttng_trigger *trigger)
-{
- return trigger->action;
-}
-
-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);
-
- assert(action);
- assert(condition);
-
- /* Release ownership. */
- lttng_action_put(action);
- lttng_condition_put(condition);
-
- free(trigger);
-}
-
-void lttng_trigger_destroy(struct lttng_trigger *trigger)
-{
- lttng_trigger_put(trigger);
-}
-
-LTTNG_HIDDEN
-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;
- struct lttng_condition *condition = NULL;
- struct lttng_action *action = NULL;
- const struct lttng_trigger_comm *trigger_comm;
- struct lttng_credentials creds = {
- .uid = LTTNG_OPTIONAL_INIT_UNSET,
- .gid = LTTNG_OPTIONAL_INIT_UNSET,
- };
-
- if (!src_view || !trigger) {
- ret = -1;
- goto end;
- }
-
- /* lttng_trigger_comm header */
- trigger_comm = (typeof(trigger_comm)) src_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);
- {
- /* 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) {
- 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;
-
- ret = offset;
-
-error:
- lttng_condition_destroy(condition);
- lttng_action_destroy(action);
-end:
- return ret;
-}
-
-/*
- * Both elements are stored contiguously, see their "*_comm" structure
- * for the detailed format.
- */
-LTTNG_HIDDEN
-int lttng_trigger_serialize(struct lttng_trigger *trigger,
- struct lttng_payload *payload)
-{
- int ret;
- size_t header_offset, size_before_payload;
- struct lttng_trigger_comm trigger_comm = {};
- struct lttng_trigger_comm *header;
- const struct lttng_credentials *creds = NULL;
-
- creds = lttng_trigger_get_credentials(trigger);
- assert(creds);
-
- trigger_comm.uid = LTTNG_OPTIONAL_GET(creds->uid);
-
- 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;
- 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;
-}
-
-LTTNG_HIDDEN
-void lttng_trigger_get(struct lttng_trigger *trigger)
-{
- urcu_ref_get(&trigger->ref);
-}
-
-LTTNG_HIDDEN
-void lttng_trigger_put(struct lttng_trigger *trigger)
-{
- if (!trigger) {
- return;
- }
-
- urcu_ref_put(&trigger->ref , trigger_destroy_ref);
-}
-
-LTTNG_HIDDEN
-const struct lttng_credentials *lttng_trigger_get_credentials(
- const struct lttng_trigger *trigger)
-{
- return &trigger->creds;
-}
-
-LTTNG_HIDDEN
-void lttng_trigger_set_credentials(struct lttng_trigger *trigger,
- const struct lttng_credentials *creds)
-{
- 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 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 (geteuid() != 0) {
- 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;
-}
projects / lttng-tools.git / blobdiff