2 * Copyright (C) 2013 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License, version 2 only,
6 * as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
13 * You should have received a copy of the GNU General Public License along
14 * with this program; if not, write to the Free Software Foundation, Inc.,
15 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
29 #include <sys/resource.h>
31 #include <sys/socket.h>
33 #include <sys/types.h>
34 #include <urcu/list.h>
40 #include <urcu/compiler.h>
44 #include <common/defaults.h>
45 #include <common/common.h>
46 #include <common/consumer.h>
47 #include <common/consumer-timer.h>
48 #include <common/compat/poll.h>
49 #include <common/sessiond-comm/sessiond-comm.h>
50 #include <common/utils.h>
52 #include "lttng-relayd.h"
53 #include "health-relayd.h"
55 /* Global health check unix path */
57 char health_unix_sock_path
[PATH_MAX
];
59 int health_quit_pipe
[2];
62 * Check if the thread quit pipe was triggered.
64 * Return 1 if it was triggered else 0;
67 int check_health_quit_pipe(int fd
, uint32_t events
)
69 if (fd
== health_quit_pipe
[0] && (events
& LPOLLIN
)) {
77 * Send data on a unix socket using the liblttsessiondcomm API.
79 * Return lttcomm error code.
81 static int send_unix_sock(int sock
, void *buf
, size_t len
)
83 /* Check valid length */
88 return lttcomm_send_unix_sock(sock
, buf
, len
);
91 static int create_lttng_rundir_with_perm(const char *rundir
)
95 DBG3("Creating LTTng run directory: %s", rundir
);
97 ret
= mkdir(rundir
, S_IRWXU
);
99 if (errno
!= EEXIST
) {
100 ERR("Unable to create %s", rundir
);
105 } else if (ret
== 0) {
106 int is_root
= !getuid();
109 ret
= chown(rundir
, 0,
110 utils_get_group_id(tracing_group_name
));
112 ERR("Unable to set group on %s", rundir
);
119 S_IRUSR
| S_IWUSR
| S_IXUSR
| S_IRGRP
| S_IXGRP
| S_IROTH
| S_IXOTH
);
121 ERR("Unable to set permissions on %s", health_unix_sock_path
);
134 int parse_health_env(void)
136 const char *health_path
;
138 health_path
= getenv(LTTNG_RELAYD_HEALTH_ENV
);
140 strncpy(health_unix_sock_path
, health_path
,
142 health_unix_sock_path
[PATH_MAX
- 1] = '\0';
149 int setup_health_path(void)
151 int is_root
, ret
= 0;
152 char *home_path
= NULL
, *rundir
= NULL
, *relayd_path
;
154 ret
= parse_health_env();
162 rundir
= strdup(DEFAULT_LTTNG_RUNDIR
);
165 * Create rundir from home path. This will create something like
168 home_path
= utils_get_home_dir();
170 if (home_path
== NULL
) {
171 /* TODO: Add --socket PATH option */
172 ERR("Can't get HOME directory for sockets creation.");
177 ret
= asprintf(&rundir
, DEFAULT_LTTNG_HOME_RUNDIR
, home_path
);
184 ret
= asprintf(&relayd_path
, DEFAULT_RELAYD_PATH
, rundir
);
190 ret
= create_lttng_rundir_with_perm(rundir
);
195 ret
= create_lttng_rundir_with_perm(relayd_path
);
201 if (strlen(health_unix_sock_path
) != 0) {
204 snprintf(health_unix_sock_path
, sizeof(health_unix_sock_path
),
205 DEFAULT_GLOBAL_RELAY_HEALTH_UNIX_SOCK
,
208 /* Set health check Unix path */
209 if (strlen(health_unix_sock_path
) != 0) {
213 snprintf(health_unix_sock_path
, sizeof(health_unix_sock_path
),
214 DEFAULT_HOME_RELAY_HEALTH_UNIX_SOCK
,
215 home_path
, getpid());
224 * Thread managing health check socket.
226 void *thread_manage_health(void *data
)
228 int sock
= -1, new_sock
= -1, ret
, i
, pollfd
, err
= -1;
229 uint32_t revents
, nb_fd
;
230 struct lttng_poll_event events
;
231 struct health_comm_msg msg
;
232 struct health_comm_reply reply
;
235 DBG("[thread] Manage health check started");
239 rcu_register_thread();
241 /* We might hit an error path before this is created. */
242 lttng_poll_init(&events
);
244 /* Create unix socket */
245 sock
= lttcomm_create_unix_sock(health_unix_sock_path
);
247 ERR("Unable to create health check Unix socket");
254 /* lttng health client socket path permissions */
255 ret
= chown(health_unix_sock_path
, 0,
256 utils_get_group_id(tracing_group_name
));
258 ERR("Unable to set group on %s", health_unix_sock_path
);
264 ret
= chmod(health_unix_sock_path
,
265 S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
267 ERR("Unable to set permissions on %s", health_unix_sock_path
);
275 * Set the CLOEXEC flag. Return code is useless because either way, the
278 (void) utils_set_fd_cloexec(sock
);
280 ret
= lttcomm_listen_unix_sock(sock
);
285 /* Size is set to 1 for the consumer_channel pipe */
286 ret
= lttng_poll_create(&events
, 2, LTTNG_CLOEXEC
);
288 ERR("Poll set creation failed");
292 ret
= lttng_poll_add(&events
, health_quit_pipe
[0], LPOLLIN
);
297 /* Add the application registration socket */
298 ret
= lttng_poll_add(&events
, sock
, LPOLLIN
| LPOLLPRI
);
304 DBG("Health check ready");
306 /* Inifinite blocking call, waiting for transmission */
308 ret
= lttng_poll_wait(&events
, -1);
311 * Restart interrupted system call.
313 if (errno
== EINTR
) {
321 for (i
= 0; i
< nb_fd
; i
++) {
322 /* Fetch once the poll data */
323 revents
= LTTNG_POLL_GETEV(&events
, i
);
324 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
326 /* Thread quit pipe has been closed. Killing thread. */
327 ret
= check_health_quit_pipe(pollfd
, revents
);
333 /* Event on the registration socket */
334 if (pollfd
== sock
) {
335 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
336 ERR("Health socket poll error");
342 new_sock
= lttcomm_accept_unix_sock(sock
);
348 * Set the CLOEXEC flag. Return code is useless because either way, the
351 (void) utils_set_fd_cloexec(new_sock
);
353 DBG("Receiving data from client for health...");
354 ret
= lttcomm_recv_unix_sock(new_sock
, (void *)&msg
, sizeof(msg
));
356 DBG("Nothing recv() from client... continuing");
357 ret
= close(new_sock
);
367 assert(msg
.cmd
== HEALTH_CMD_CHECK
);
370 for (i
= 0; i
< NR_HEALTH_RELAYD_TYPES
; i
++) {
372 * health_check_state return 0 if thread is in
375 if (!health_check_state(health_relayd
, i
)) {
376 reply
.ret_code
|= 1ULL << i
;
380 DBG2("Health check return value %" PRIx64
, reply
.ret_code
);
382 ret
= send_unix_sock(new_sock
, (void *) &reply
, sizeof(reply
));
384 ERR("Failed to send health data back to client");
387 /* End of transmission */
388 ret
= close(new_sock
);
398 ERR("Health error occurred in %s", __func__
);
400 DBG("Health check thread dying");
401 unlink(health_unix_sock_path
);
410 * We do NOT rmdir rundir nor the relayd path because there are
411 * other processes using them.
414 lttng_poll_clean(&events
);
416 rcu_unregister_thread();