/*
- * Copyright (C) 2013 - Julien Desfossez <jdesfossez@efficios.com>
- * David Goulet <dgoulet@efficios.com>
- * 2015 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ * Copyright (C) 2013 Julien Desfossez <jdesfossez@efficios.com>
+ * Copyright (C) 2013 David Goulet <dgoulet@efficios.com>
+ * Copyright (C) 2015 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
*
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License, version 2 only, as
- * published by the Free Software Foundation.
+ * SPDX-License-Identifier: GPL-2.0-only
*
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along with
- * this program; if not, write to the Free Software Foundation, Inc., 51
- * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#define _LGPL_SOURCE
#include <common/common.h>
+#include <common/compat/path.h>
+#include <common/fd-tracker/utils.h>
+#include <common/time.h>
#include <common/utils.h>
-#include <common/compat/uuid.h>
+#include <common/uuid.h>
#include <urcu/rculist.h>
+#include <sys/stat.h>
+
#include "ctf-trace.h"
#include "lttng-relayd.h"
#include "session.h"
#include "sessiond-trace-chunks.h"
#include "stream.h"
+#include <common/defaults.h>
+#include "utils.h"
/* Global session id used in the session creation. */
static uint64_t last_relay_session_id;
static pthread_mutex_t last_relay_session_id_lock = PTHREAD_MUTEX_INITIALIZER;
-static int session_set_anonymous_chunk(struct relay_session *session)
+static int init_session_output_path_group_by_host(struct relay_session *session)
{
+ /*
+ * session_directory:
+ *
+ * if base_path is \0'
+ * hostname/session_name
+ * else
+ * hostname/base_path
+ */
+ char *session_directory = NULL;
int ret = 0;
- struct lttng_trace_chunk *chunk = NULL;
- enum lttng_trace_chunk_status status;
- struct lttng_directory_handle output_directory;
- const char *base_path = opt_output_path;
-
- if (base_path == NULL) {
- /* No output path defined */
- base_path = utils_get_home_dir();
- if (base_path == NULL) {
- ERR("Home path not found.\n \
- Please specify an output path using -o, --output PATH");
+
+ if (session->output_path[0] != '\0') {
+ goto end;
+ }
+ /*
+ * If base path is set, it overrides the session name for the
+ * session relative base path. No timestamp is appended if the
+ * base path is overridden.
+ *
+ * If the session name already contains the creation time (e.g.
+ * auto-<timestamp>, don't append yet another timestamp after
+ * the session name in the generated path.
+ *
+ * Otherwise, generate the path with session_name-<timestamp>.
+ */
+ if (session->base_path[0] != '\0') {
+ ret = asprintf(&session_directory, "%s/%s", session->hostname,
+ session->base_path);
+ } else if (session->session_name_contains_creation_time) {
+ ret = asprintf(&session_directory, "%s/%s", session->hostname,
+ session->session_name);
+ } else {
+ char session_creation_datetime[DATETIME_STR_LEN];
+
+ ret = time_to_datetime_str(
+ LTTNG_OPTIONAL_GET(session->creation_time),
+ session_creation_datetime,
+ sizeof(session_creation_datetime));
+ if (ret) {
+ ERR("Failed to format session creation timestamp while initializing session output directory handle");
ret = -1;
goto end;
}
+
+ ret = asprintf(&session_directory, "%s/%s-%s",
+ session->hostname, session->session_name,
+ session_creation_datetime);
+ }
+ if (ret < 0) {
+ PERROR("Failed to format session directory name");
+ goto end;
+ }
+
+ if (strlen(session_directory) >= LTTNG_PATH_MAX) {
+ ERR("Session output directory exceeds maximal length");
+ ret = -1;
+ goto end;
+ }
+ strcpy(session->output_path, session_directory);
+ ret = 0;
+
+end:
+ free(session_directory);
+ return ret;
+}
+
+static int init_session_output_path_group_by_session(
+ struct relay_session *session)
+{
+ /*
+ * session_directory:
+ *
+ * session_name/hostname-creation_time/base_path
+ *
+ * For session name including the datetime, use it as the complete name
+ * since. Do not perform modification on it since the datetime is an
+ * integral part of the name and how a user identify a session.
+ */
+ int ret = 0;
+ char *session_directory = NULL;
+ char creation_datetime[DATETIME_STR_LEN];
+
+ if (session->output_path[0] != '\0') {
+ /* output_path as been generated already */
+ goto end;
+ }
+
+ ret = time_to_datetime_str(LTTNG_OPTIONAL_GET(session->creation_time),
+ creation_datetime, sizeof(creation_datetime));
+ if (ret) {
+ ERR("Failed to format session creation timestamp while initializing session output directory handle");
+ ret = -1;
+ goto end;
+ }
+
+ ret = asprintf(&session_directory, "%s/%s-%s%s%s",
+ session->session_name, session->hostname,
+ creation_datetime,
+ session->base_path[0] != '\0' ? "/" : "",
+ session->base_path);
+ if (ret < 0) {
+ PERROR("Failed to format session directory name");
+ goto end;
+ }
+
+ if (strlen(session_directory) >= LTTNG_PATH_MAX) {
+ ERR("Session output directory exceeds maximal length");
+ ret = -1;
+ goto end;
+ }
+
+ strcpy(session->output_path, session_directory);
+ ret = 0;
+
+end:
+ free(session_directory);
+ return ret;
+}
+
+static int init_session_output_path(struct relay_session *session)
+{
+ int ret;
+
+ switch (opt_group_output_by) {
+ case RELAYD_GROUP_OUTPUT_BY_HOST:
+ ret = init_session_output_path_group_by_host(session);
+ break;
+ case RELAYD_GROUP_OUTPUT_BY_SESSION:
+ ret = init_session_output_path_group_by_session(session);
+ break;
+ case RELAYD_GROUP_OUTPUT_BY_UNKNOWN:
+ default:
+ abort();
+ break;
+ }
+
+ return ret;
+}
+
+static struct lttng_directory_handle *session_create_output_directory_handle(
+ struct relay_session *session)
+{
+ int ret;
+ /*
+ * relayd_output_path/session_directory
+ * e.g. /home/user/lttng-traces/hostname/session_name
+ */
+ char *full_session_path = NULL;
+ struct lttng_directory_handle *handle = NULL;
+
+ pthread_mutex_lock(&session->lock);
+ full_session_path = create_output_path(session->output_path);
+ if (!full_session_path) {
+ goto end;
}
- ret = lttng_directory_handle_init(&output_directory, base_path);
+ ret = utils_mkdir_recursive(
+ full_session_path, S_IRWXU | S_IRWXG, -1, -1);
if (ret) {
+ ERR("Failed to create session output path \"%s\"",
+ full_session_path);
+ goto end;
+ }
+
+ handle = fd_tracker_create_directory_handle(the_fd_tracker, full_session_path);
+end:
+ pthread_mutex_unlock(&session->lock);
+ free(full_session_path);
+ return handle;
+}
+
+static int session_set_anonymous_chunk(struct relay_session *session)
+{
+ int ret = 0;
+ struct lttng_trace_chunk *chunk = NULL;
+ enum lttng_trace_chunk_status status;
+ struct lttng_directory_handle *output_directory;
+
+ output_directory = session_create_output_directory_handle(session);
+ if (!output_directory) {
goto end;
}
goto end;
}
+ lttng_trace_chunk_set_fd_tracker(chunk, the_fd_tracker);
status = lttng_trace_chunk_set_credentials_current_user(chunk);
if (status != LTTNG_TRACE_CHUNK_STATUS_OK) {
ret = -1;
goto end;
}
- status = lttng_trace_chunk_set_as_owner(chunk, &output_directory);
+ status = lttng_trace_chunk_set_as_owner(chunk, output_directory);
if (status != LTTNG_TRACE_CHUNK_STATUS_OK) {
ret = -1;
goto end;
}
+
session->current_trace_chunk = chunk;
chunk = NULL;
end:
lttng_trace_chunk_put(chunk);
- lttng_directory_handle_fini(&output_directory);
+ lttng_directory_handle_put(output_directory);
return ret;
}
+/*
+ * Check if a name is safe to use in a path.
+ *
+ * A name that is deemed "path-safe":
+ * - Does not contains a path separator (/ or \, platform dependant),
+ * - Does not start with a '.' (hidden file/folder),
+ * - Is not empty.
+ */
+static bool is_name_path_safe(const char *name)
+{
+ const size_t name_len = strlen(name);
+
+ /* Not empty. */
+ if (name_len == 0) {
+ WARN("An empty name is not allowed to be used in a path");
+ return false;
+ }
+ /* Does not start with '.'. */
+ if (name[0] == '.') {
+ WARN("Name \"%s\" is not allowed to be used in a path since it starts with '.'", name);
+ return false;
+ }
+ /* Does not contain a path-separator. */
+ if (strchr(name, LTTNG_PATH_SEPARATOR)) {
+ WARN("Name \"%s\" is not allowed to be used in a path since it contains a path separator", name);
+ return false;
+ }
+
+ return true;
+}
+
/*
* Create a new session by assigning a new session ID.
*
* Return allocated session or else NULL.
*/
struct relay_session *session_create(const char *session_name,
- const char *hostname,
+ const char *hostname, const char *base_path,
uint32_t live_timer,
bool snapshot,
const lttng_uuid sessiond_uuid,
const uint64_t *current_chunk_id,
const time_t *creation_time,
uint32_t major,
- uint32_t minor)
+ uint32_t minor,
+ bool session_name_contains_creation_time)
{
int ret;
- struct relay_session *session;
+ struct relay_session *session = NULL;
+
+ assert(session_name);
+ assert(hostname);
+ assert(base_path);
+
+ if (!is_name_path_safe(session_name)) {
+ ERR("Refusing to create session as the provided session name is not path-safe");
+ goto error;
+ }
+ if (!is_name_path_safe(hostname)) {
+ ERR("Refusing to create session as the provided hostname is not path-safe");
+ goto error;
+ }
+ if (strstr(base_path, "../")) {
+ ERR("Invalid session base path walks up the path hierarchy: \"%s\"",
+ base_path);
+ goto error;
+ }
session = zmalloc(sizeof(*session));
if (!session) {
PERROR("Failed to allocate session");
goto error;
}
+
+ pthread_mutex_lock(&last_relay_session_id_lock);
+ session->id = ++last_relay_session_id;
+ pthread_mutex_unlock(&last_relay_session_id_lock);
+
+ lttng_ht_node_init_u64(&session->session_n, session->id);
+ urcu_ref_init(&session->ref);
+ CDS_INIT_LIST_HEAD(&session->recv_list);
+ pthread_mutex_init(&session->lock, NULL);
+ pthread_mutex_init(&session->recv_list_lock, NULL);
+
if (lttng_strncpy(session->session_name, session_name,
sizeof(session->session_name))) {
WARN("Session name exceeds maximal allowed length");
WARN("Hostname exceeds maximal allowed length");
goto error;
}
+ if (lttng_strncpy(session->base_path, base_path,
+ sizeof(session->base_path))) {
+ WARN("Base path exceeds maximal allowed length");
+ goto error;
+ }
+ if (creation_time) {
+ LTTNG_OPTIONAL_SET(&session->creation_time, *creation_time);
+ } else {
+ LTTNG_OPTIONAL_SET(&session->creation_time, time(NULL));
+ if (session->creation_time.value == (time_t) -1) {
+ PERROR("Failed to sample session creation time");
+ goto error;
+ }
+ }
+ session->session_name_contains_creation_time =
+ session_name_contains_creation_time;
+
session->ctf_traces_ht = lttng_ht_new(0, LTTNG_HT_TYPE_STRING);
if (!session->ctf_traces_ht) {
goto error;
}
- pthread_mutex_lock(&last_relay_session_id_lock);
- session->id = ++last_relay_session_id;
- pthread_mutex_unlock(&last_relay_session_id_lock);
-
session->major = major;
session->minor = minor;
- lttng_ht_node_init_u64(&session->session_n, session->id);
- urcu_ref_init(&session->ref);
- CDS_INIT_LIST_HEAD(&session->recv_list);
- pthread_mutex_init(&session->lock, NULL);
- pthread_mutex_init(&session->recv_list_lock, NULL);
session->live_timer = live_timer;
session->snapshot = snapshot;
LTTNG_OPTIONAL_SET(&session->id_sessiond, *id_sessiond);
}
+ if (major == 2 && minor >= 11) {
+ /* Only applies for 2.11+ peers using trace chunks. */
+ ret = init_session_output_path(session);
+ if (ret) {
+ goto error;
+ }
+ }
+
ret = sessiond_trace_chunk_registry_session_created(
sessiond_trace_chunk_registry, sessiond_uuid);
if (ret) {
}
if (id_sessiond && current_chunk_id) {
+ enum lttng_trace_chunk_status chunk_status;
+ struct lttng_directory_handle *session_output_directory;
+
session->current_trace_chunk =
sessiond_trace_chunk_registry_get_chunk(
sessiond_trace_chunk_registry,
session->id_sessiond.value,
*current_chunk_id);
if (!session->current_trace_chunk) {
- char uuid_str[UUID_STR_LEN];
+ char uuid_str[LTTNG_UUID_STR_LEN];
lttng_uuid_to_str(sessiond_uuid, uuid_str);
ERR("Could not find trace chunk: sessiond = {%s}, sessiond session id = %" PRIu64 ", trace chunk id = %" PRIu64,
uuid_str, *id_sessiond,
*current_chunk_id);
+ goto error;
}
+
+ chunk_status = lttng_trace_chunk_get_session_output_directory_handle(
+ session->current_trace_chunk,
+ &session_output_directory);
+ if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) {
+ goto error;
+ }
+
+ assert(session_output_directory);
+ session->output_directory = session_output_directory;
} else if (!id_sessiond) {
/*
* Pre-2.11 peers will not announce trace chunks. An
if (ret) {
goto error;
}
+ } else {
+ session->output_directory =
+ session_create_output_directory_handle(session);
+ if (!session->output_directory) {
+ goto error;
+ }
}
lttng_ht_add_unique_u64(sessions_ht, &session->session_n);
- if (creation_time) {
- LTTNG_OPTIONAL_SET(&session->creation_time, *creation_time);
- }
return session;
error:
return session;
}
+/*
+ * Check if any of the relay sessions originating from the same
+ * session daemon session have the 'ongoing_rotation' state set.
+ *
+ * The caller must hold the lock of session.
+ */
+bool session_has_ongoing_rotation(const struct relay_session *session)
+{
+ bool ongoing_rotation = false;
+ struct lttng_ht_iter iter;
+ struct relay_session *iterated_session;
+
+ ASSERT_LOCKED(session->lock);
+
+ if (!session->id_sessiond.is_set) {
+ /*
+ * The peer that created this session is too old to
+ * support rotations; we can assume no rotations are ongoing.
+ */
+ goto end;
+ }
+
+ if (session->ongoing_rotation) {
+ ongoing_rotation = true;
+ goto end;
+ }
+
+ rcu_read_lock();
+ /*
+ * Sample the 'ongoing_rotation' status of all relay sessions that
+ * originate from the same session daemon session.
+ */
+ cds_lfht_for_each_entry(sessions_ht->ht, &iter.iter, iterated_session,
+ session_n.node) {
+ if (!session_get(iterated_session)) {
+ continue;
+ }
+
+ if (session == iterated_session) {
+ /* Skip this session. */
+ goto next_session_no_unlock;
+ }
+
+ pthread_mutex_lock(&iterated_session->lock);
+
+ if (!iterated_session->id_sessiond.is_set) {
+ /*
+ * Session belongs to a peer that doesn't support
+ * rotations.
+ */
+ goto next_session;
+ }
+
+ if (!lttng_uuid_is_equal(session->sessiond_uuid,
+ iterated_session->sessiond_uuid)) {
+ /* Sessions do not originate from the same sessiond. */
+ goto next_session;
+ }
+
+ if (LTTNG_OPTIONAL_GET(session->id_sessiond) !=
+ LTTNG_OPTIONAL_GET(iterated_session->id_sessiond)) {
+ /*
+ * Sessions do not originate from the same sessiond
+ * session.
+ */
+ goto next_session;
+ }
+
+ ongoing_rotation = iterated_session->ongoing_rotation;
+
+next_session:
+ pthread_mutex_unlock(&iterated_session->lock);
+next_session_no_unlock:
+ session_put(iterated_session);
+
+ if (ongoing_rotation) {
+ break;
+ }
+ }
+ rcu_read_unlock();
+
+end:
+ return ongoing_rotation;
+}
+
static void rcu_destroy_session(struct rcu_head *rcu_head)
{
struct relay_session *session =
ret = sessiond_trace_chunk_registry_session_destroyed(
sessiond_trace_chunk_registry, session->sessiond_uuid);
assert(!ret);
+ lttng_directory_handle_put(session->output_directory);
+ session->output_directory = NULL;
call_rcu(&session->rcu_node, rcu_destroy_session);
}
-void session_release(struct urcu_ref *ref)
+static void session_release(struct urcu_ref *ref)
{
struct relay_session *session =
caa_container_of(ref, struct relay_session, ref);
void session_put(struct relay_session *session)
{
+ if (!session) {
+ return;
+ }
rcu_read_lock();
urcu_ref_put(&session->ref, session_release);
rcu_read_unlock();