/*
* Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
*
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; only version 2
- * of the License.
+ * 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.
*
* 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
+ * 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ * 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 _GNU_SOURCE
#include <limits.h>
+#include <inttypes.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
-#include <sys/types.h>
#include <urcu.h>
#include <common/common.h>
static struct ltt_session_list ltt_session_list = {
.head = CDS_LIST_HEAD_INIT(ltt_session_list.head),
.lock = PTHREAD_MUTEX_INITIALIZER,
- .count = 0,
+ .next_uuid = 0,
};
+/* These characters are forbidden in a session name. Used by validate_name. */
+static const char *forbidden_name_chars = "/";
+
+/*
+ * Validate the session name for forbidden characters.
+ *
+ * Return 0 on success else -1 meaning a forbidden char. has been found.
+ */
+static int validate_name(const char *name)
+{
+ int ret;
+ char *tok, *tmp_name;
+
+ assert(name);
+
+ tmp_name = strdup(name);
+ if (!tmp_name) {
+ /* ENOMEM here. */
+ ret = -1;
+ goto error;
+ }
+
+ tok = strpbrk(tmp_name, forbidden_name_chars);
+ if (tok) {
+ DBG("Session name %s contains a forbidden character", name);
+ /* Forbidden character has been found. */
+ ret = -1;
+ goto error;
+ }
+ ret = 0;
+
+error:
+ free(tmp_name);
+ return ret;
+}
+
/*
* Add a ltt_session structure to the global list.
*
* The caller MUST acquire the session list lock before.
* Returns the unique identifier for the session.
*/
-static int add_session_list(struct ltt_session *ls)
+static uint64_t add_session_list(struct ltt_session *ls)
{
+ assert(ls);
+
cds_list_add(&ls->list, <t_session_list.head);
- return ++ltt_session_list.count;
+ return ltt_session_list.next_uuid++;
}
/*
*/
static void del_session_list(struct ltt_session *ls)
{
+ assert(ls);
+
cds_list_del(&ls->list);
- /* Sanity check */
- if (ltt_session_list.count > 0) {
- ltt_session_list.count--;
- }
}
/*
*/
void session_lock(struct ltt_session *session)
{
+ assert(session);
+
pthread_mutex_lock(&session->lock);
}
*/
void session_unlock(struct ltt_session *session)
{
+ assert(session);
+
pthread_mutex_unlock(&session->lock);
}
{
struct ltt_session *iter;
+ assert(name);
+
DBG2("Trying to find session by name %s", name);
cds_list_for_each_entry(iter, <t_session_list.head, list) {
* Delete session from the session list and free the memory.
*
* Return -1 if no session is found. On success, return 1;
+ * Should *NOT* be called with RCU read-side lock held.
*/
int session_destroy(struct ltt_session *session)
{
/* Safety check */
- if (session == NULL) {
- ERR("Session pointer was null on session destroy");
- return LTTCOMM_OK;
- }
+ assert(session);
DBG("Destroying session %s", session->name);
del_session_list(session);
pthread_mutex_destroy(&session->lock);
+
+ consumer_destroy_output(session->consumer);
+ snapshot_destroy(&session->snapshot);
free(session);
- return LTTCOMM_OK;
+ return LTTNG_OK;
}
/*
* Create a brand new session and add it to the session list.
*/
-int session_create(char *name, char *path, uid_t uid, gid_t gid)
+int session_create(char *name, uid_t uid, gid_t gid)
{
int ret;
struct ltt_session *new_session;
- new_session = session_find_by_name(name);
- if (new_session != NULL) {
- ret = LTTCOMM_EXIST_SESS;
- goto error_exist;
- }
-
/* Allocate session data structure */
new_session = zmalloc(sizeof(struct ltt_session));
if (new_session == NULL) {
PERROR("zmalloc");
- ret = LTTCOMM_FATAL;
+ ret = LTTNG_ERR_FATAL;
goto error_malloc;
}
/* Define session name */
if (name != NULL) {
if (snprintf(new_session->name, NAME_MAX, "%s", name) < 0) {
- ret = LTTCOMM_FATAL;
+ ret = LTTNG_ERR_FATAL;
goto error_asprintf;
}
} else {
ERR("No session name given");
- ret = LTTCOMM_FATAL;
+ ret = LTTNG_ERR_FATAL;
goto error;
}
- /* Define session system path */
- if (path != NULL) {
- if (snprintf(new_session->path, PATH_MAX, "%s", path) < 0) {
- ret = LTTCOMM_FATAL;
- goto error_asprintf;
- }
- } else {
- ERR("No session path given");
- ret = LTTCOMM_FATAL;
+ ret = validate_name(name);
+ if (ret < 0) {
+ ret = LTTNG_ERR_SESSION_INVALID_CHAR;
goto error;
}
+ ret = gethostname(new_session->hostname, sizeof(new_session->hostname));
+ if (ret < 0) {
+ if (errno == ENAMETOOLONG) {
+ new_session->hostname[sizeof(new_session->hostname) - 1] = '\0';
+ } else {
+ ret = LTTNG_ERR_FATAL;
+ goto error;
+ }
+ }
+
/* Init kernel session */
new_session->kernel_session = NULL;
new_session->ust_session = NULL;
new_session->uid = uid;
new_session->gid = gid;
- ret = run_as_mkdir_recursive(new_session->path, S_IRWXU | S_IRWXG,
- new_session->uid, new_session->gid);
+ ret = snapshot_init(&new_session->snapshot);
if (ret < 0) {
- if (ret != -EEXIST) {
- ERR("Trace directory creation error");
- ret = LTTCOMM_CREATE_DIR_FAIL;
- goto error;
- }
+ ret = LTTNG_ERR_NOMEM;
+ goto error;
}
/* Add new session to the session list */
new_session->id = add_session_list(new_session);
session_unlock_list();
- DBG("Tracing session %s created in %s with ID %d by UID %d GID %d",
- name, path, new_session->id,
- new_session->uid, new_session->gid);
+ /*
+ * Consumer is let to NULL since the create_session_uri command will set it
+ * up and, if valid, assign it to the session.
+ */
+
+ DBG("Tracing session %s created with ID %" PRIu64 " by UID %d GID %d",
+ name, new_session->id, new_session->uid, new_session->gid);
- return LTTCOMM_OK;
+ return LTTNG_OK;
error:
error_asprintf:
- if (new_session != NULL) {
- free(new_session);
- }
+ free(new_session);
-error_exist:
error_malloc:
return ret;
}
+
+/*
+ * Check if the UID or GID match the session. Root user has access to all
+ * sessions.
+ */
+int session_access_ok(struct ltt_session *session, uid_t uid, gid_t gid)
+{
+ assert(session);
+
+ if (uid != session->uid && gid != session->gid && uid != 0) {
+ return 0;
+ } else {
+ return 1;
+ }
+}
projects / lttng-tools.git / blobdiff