Commit | Line | Data |
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65931c8b MD |
1 | /* |
2 | * Copyright (C) 2013 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
3 | * | |
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. | |
7 | * | |
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. | |
12 | * | |
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. | |
16 | */ | |
17 | ||
18 | #define _GNU_SOURCE | |
6c1c0768 | 19 | #define _LGPL_SOURCE |
65931c8b MD |
20 | #include <fcntl.h> |
21 | #include <getopt.h> | |
22 | #include <grp.h> | |
23 | #include <limits.h> | |
24 | #include <pthread.h> | |
25 | #include <signal.h> | |
26 | #include <stdio.h> | |
27 | #include <stdlib.h> | |
28 | #include <string.h> | |
29 | #include <sys/ipc.h> | |
30 | #include <sys/resource.h> | |
31 | #include <sys/shm.h> | |
32 | #include <sys/socket.h> | |
33 | #include <sys/stat.h> | |
34 | #include <sys/types.h> | |
35 | #include <urcu/list.h> | |
36 | #include <poll.h> | |
37 | #include <unistd.h> | |
38 | #include <sys/mman.h> | |
39 | #include <assert.h> | |
40 | #include <config.h> | |
41 | #include <urcu/compiler.h> | |
42 | #include <ulimit.h> | |
43 | #include <inttypes.h> | |
44 | ||
45 | #include <common/defaults.h> | |
46 | #include <common/common.h> | |
47 | #include <common/consumer.h> | |
48 | #include <common/consumer-timer.h> | |
49 | #include <common/compat/poll.h> | |
50 | #include <common/sessiond-comm/sessiond-comm.h> | |
51 | #include <common/utils.h> | |
52 | ||
53 | #include "lttng-relayd.h" | |
54 | #include "health-relayd.h" | |
55 | ||
56 | /* Global health check unix path */ | |
094fe907 MD |
57 | static |
58 | char health_unix_sock_path[PATH_MAX]; | |
65931c8b MD |
59 | |
60 | int health_quit_pipe[2]; | |
61 | ||
62 | /* | |
63 | * Check if the thread quit pipe was triggered. | |
64 | * | |
65 | * Return 1 if it was triggered else 0; | |
66 | */ | |
67 | static | |
68 | int check_health_quit_pipe(int fd, uint32_t events) | |
69 | { | |
70 | if (fd == health_quit_pipe[0] && (events & LPOLLIN)) { | |
71 | return 1; | |
72 | } | |
73 | ||
74 | return 0; | |
75 | } | |
76 | ||
77 | /* | |
78 | * Send data on a unix socket using the liblttsessiondcomm API. | |
79 | * | |
80 | * Return lttcomm error code. | |
81 | */ | |
82 | static int send_unix_sock(int sock, void *buf, size_t len) | |
83 | { | |
84 | /* Check valid length */ | |
85 | if (len == 0) { | |
86 | return -1; | |
87 | } | |
88 | ||
89 | return lttcomm_send_unix_sock(sock, buf, len); | |
90 | } | |
91 | ||
92 | static int create_lttng_rundir_with_perm(const char *rundir) | |
93 | { | |
94 | int ret; | |
95 | ||
96 | DBG3("Creating LTTng run directory: %s", rundir); | |
97 | ||
98 | ret = mkdir(rundir, S_IRWXU); | |
99 | if (ret < 0) { | |
100 | if (errno != EEXIST) { | |
101 | ERR("Unable to create %s", rundir); | |
102 | goto error; | |
103 | } else { | |
104 | ret = 0; | |
105 | } | |
106 | } else if (ret == 0) { | |
107 | int is_root = !getuid(); | |
108 | ||
109 | if (is_root) { | |
110 | ret = chown(rundir, 0, | |
111 | utils_get_group_id(tracing_group_name)); | |
112 | if (ret < 0) { | |
113 | ERR("Unable to set group on %s", rundir); | |
114 | PERROR("chown"); | |
115 | ret = -1; | |
116 | goto error; | |
117 | } | |
118 | ||
119 | ret = chmod(rundir, | |
120 | S_IRUSR | S_IWUSR | S_IXUSR | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH); | |
121 | if (ret < 0) { | |
122 | ERR("Unable to set permissions on %s", health_unix_sock_path); | |
123 | PERROR("chmod"); | |
124 | ret = -1; | |
125 | goto error; | |
126 | } | |
127 | } | |
128 | } | |
129 | ||
130 | error: | |
131 | return ret; | |
132 | } | |
133 | ||
094fe907 MD |
134 | static |
135 | int parse_health_env(void) | |
136 | { | |
137 | const char *health_path; | |
138 | ||
139 | health_path = getenv(LTTNG_RELAYD_HEALTH_ENV); | |
140 | if (health_path) { | |
141 | strncpy(health_unix_sock_path, health_path, | |
142 | PATH_MAX); | |
143 | health_unix_sock_path[PATH_MAX - 1] = '\0'; | |
144 | } | |
145 | ||
146 | return 0; | |
147 | } | |
148 | ||
65931c8b MD |
149 | static |
150 | int setup_health_path(void) | |
151 | { | |
152 | int is_root, ret = 0; | |
c3844e39 | 153 | char *home_path = NULL, *rundir = NULL, *relayd_path; |
65931c8b | 154 | |
094fe907 MD |
155 | ret = parse_health_env(); |
156 | if (ret) { | |
157 | return ret; | |
158 | } | |
159 | ||
65931c8b MD |
160 | is_root = !getuid(); |
161 | ||
162 | if (is_root) { | |
c3844e39 | 163 | rundir = strdup(DEFAULT_LTTNG_RUNDIR); |
b6ab01aa MD |
164 | if (!rundir) { |
165 | ret = -ENOMEM; | |
166 | goto end; | |
167 | } | |
65931c8b MD |
168 | } else { |
169 | /* | |
170 | * Create rundir from home path. This will create something like | |
171 | * $HOME/.lttng | |
172 | */ | |
173 | home_path = utils_get_home_dir(); | |
174 | ||
175 | if (home_path == NULL) { | |
176 | /* TODO: Add --socket PATH option */ | |
177 | ERR("Can't get HOME directory for sockets creation."); | |
178 | ret = -EPERM; | |
179 | goto end; | |
180 | } | |
181 | ||
c3844e39 | 182 | ret = asprintf(&rundir, DEFAULT_LTTNG_HOME_RUNDIR, home_path); |
65931c8b MD |
183 | if (ret < 0) { |
184 | ret = -ENOMEM; | |
185 | goto end; | |
186 | } | |
187 | } | |
188 | ||
c3844e39 | 189 | ret = asprintf(&relayd_path, DEFAULT_RELAYD_PATH, rundir); |
65931c8b MD |
190 | if (ret < 0) { |
191 | ret = -ENOMEM; | |
192 | goto end; | |
193 | } | |
194 | ||
c3844e39 | 195 | ret = create_lttng_rundir_with_perm(rundir); |
65931c8b MD |
196 | if (ret < 0) { |
197 | goto end; | |
198 | } | |
199 | ||
200 | ret = create_lttng_rundir_with_perm(relayd_path); | |
201 | if (ret < 0) { | |
202 | goto end; | |
203 | } | |
204 | ||
205 | if (is_root) { | |
206 | if (strlen(health_unix_sock_path) != 0) { | |
207 | goto end; | |
208 | } | |
209 | snprintf(health_unix_sock_path, sizeof(health_unix_sock_path), | |
210 | DEFAULT_GLOBAL_RELAY_HEALTH_UNIX_SOCK, | |
211 | getpid()); | |
212 | } else { | |
213 | /* Set health check Unix path */ | |
214 | if (strlen(health_unix_sock_path) != 0) { | |
215 | goto end; | |
216 | } | |
217 | ||
218 | snprintf(health_unix_sock_path, sizeof(health_unix_sock_path), | |
219 | DEFAULT_HOME_RELAY_HEALTH_UNIX_SOCK, | |
220 | home_path, getpid()); | |
221 | } | |
222 | ||
223 | end: | |
c3844e39 | 224 | free(rundir); |
65931c8b MD |
225 | return ret; |
226 | } | |
227 | ||
228 | /* | |
229 | * Thread managing health check socket. | |
230 | */ | |
231 | void *thread_manage_health(void *data) | |
232 | { | |
233 | int sock = -1, new_sock = -1, ret, i, pollfd, err = -1; | |
234 | uint32_t revents, nb_fd; | |
235 | struct lttng_poll_event events; | |
236 | struct health_comm_msg msg; | |
237 | struct health_comm_reply reply; | |
238 | int is_root; | |
239 | ||
240 | DBG("[thread] Manage health check started"); | |
241 | ||
242 | setup_health_path(); | |
243 | ||
244 | rcu_register_thread(); | |
245 | ||
246 | /* We might hit an error path before this is created. */ | |
247 | lttng_poll_init(&events); | |
248 | ||
249 | /* Create unix socket */ | |
250 | sock = lttcomm_create_unix_sock(health_unix_sock_path); | |
251 | if (sock < 0) { | |
252 | ERR("Unable to create health check Unix socket"); | |
253 | ret = -1; | |
254 | goto error; | |
255 | } | |
256 | ||
257 | is_root = !getuid(); | |
258 | if (is_root) { | |
259 | /* lttng health client socket path permissions */ | |
260 | ret = chown(health_unix_sock_path, 0, | |
261 | utils_get_group_id(tracing_group_name)); | |
262 | if (ret < 0) { | |
263 | ERR("Unable to set group on %s", health_unix_sock_path); | |
264 | PERROR("chown"); | |
265 | ret = -1; | |
266 | goto error; | |
267 | } | |
268 | ||
269 | ret = chmod(health_unix_sock_path, | |
270 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
271 | if (ret < 0) { | |
272 | ERR("Unable to set permissions on %s", health_unix_sock_path); | |
273 | PERROR("chmod"); | |
274 | ret = -1; | |
275 | goto error; | |
276 | } | |
277 | } | |
278 | ||
279 | /* | |
280 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
281 | * show must go on. | |
282 | */ | |
283 | (void) utils_set_fd_cloexec(sock); | |
284 | ||
285 | ret = lttcomm_listen_unix_sock(sock); | |
286 | if (ret < 0) { | |
287 | goto error; | |
288 | } | |
289 | ||
290 | /* Size is set to 1 for the consumer_channel pipe */ | |
291 | ret = lttng_poll_create(&events, 2, LTTNG_CLOEXEC); | |
292 | if (ret < 0) { | |
293 | ERR("Poll set creation failed"); | |
294 | goto error; | |
295 | } | |
296 | ||
297 | ret = lttng_poll_add(&events, health_quit_pipe[0], LPOLLIN); | |
298 | if (ret < 0) { | |
299 | goto error; | |
300 | } | |
301 | ||
302 | /* Add the application registration socket */ | |
303 | ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLPRI); | |
304 | if (ret < 0) { | |
305 | goto error; | |
306 | } | |
307 | ||
3fd27398 MD |
308 | lttng_relay_notify_ready(); |
309 | ||
65931c8b MD |
310 | while (1) { |
311 | DBG("Health check ready"); | |
312 | ||
313 | /* Inifinite blocking call, waiting for transmission */ | |
314 | restart: | |
315 | ret = lttng_poll_wait(&events, -1); | |
316 | if (ret < 0) { | |
317 | /* | |
318 | * Restart interrupted system call. | |
319 | */ | |
320 | if (errno == EINTR) { | |
321 | goto restart; | |
322 | } | |
323 | goto error; | |
324 | } | |
325 | ||
326 | nb_fd = ret; | |
327 | ||
328 | for (i = 0; i < nb_fd; i++) { | |
329 | /* Fetch once the poll data */ | |
330 | revents = LTTNG_POLL_GETEV(&events, i); | |
331 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
332 | ||
333 | /* Thread quit pipe has been closed. Killing thread. */ | |
334 | ret = check_health_quit_pipe(pollfd, revents); | |
335 | if (ret) { | |
336 | err = 0; | |
337 | goto exit; | |
338 | } | |
339 | ||
340 | /* Event on the registration socket */ | |
341 | if (pollfd == sock) { | |
342 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
343 | ERR("Health socket poll error"); | |
344 | goto error; | |
345 | } | |
346 | } | |
347 | } | |
348 | ||
349 | new_sock = lttcomm_accept_unix_sock(sock); | |
350 | if (new_sock < 0) { | |
351 | goto error; | |
352 | } | |
353 | ||
354 | /* | |
355 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
356 | * show must go on. | |
357 | */ | |
358 | (void) utils_set_fd_cloexec(new_sock); | |
359 | ||
360 | DBG("Receiving data from client for health..."); | |
361 | ret = lttcomm_recv_unix_sock(new_sock, (void *)&msg, sizeof(msg)); | |
362 | if (ret <= 0) { | |
363 | DBG("Nothing recv() from client... continuing"); | |
364 | ret = close(new_sock); | |
365 | if (ret) { | |
366 | PERROR("close"); | |
367 | } | |
368 | new_sock = -1; | |
369 | continue; | |
370 | } | |
371 | ||
372 | rcu_thread_online(); | |
373 | ||
374 | assert(msg.cmd == HEALTH_CMD_CHECK); | |
375 | ||
53efb85a | 376 | memset(&reply, 0, sizeof(reply)); |
65931c8b MD |
377 | for (i = 0; i < NR_HEALTH_RELAYD_TYPES; i++) { |
378 | /* | |
379 | * health_check_state return 0 if thread is in | |
380 | * error. | |
381 | */ | |
382 | if (!health_check_state(health_relayd, i)) { | |
383 | reply.ret_code |= 1ULL << i; | |
384 | } | |
385 | } | |
386 | ||
387 | DBG2("Health check return value %" PRIx64, reply.ret_code); | |
388 | ||
389 | ret = send_unix_sock(new_sock, (void *) &reply, sizeof(reply)); | |
390 | if (ret < 0) { | |
391 | ERR("Failed to send health data back to client"); | |
392 | } | |
393 | ||
394 | /* End of transmission */ | |
395 | ret = close(new_sock); | |
396 | if (ret) { | |
397 | PERROR("close"); | |
398 | } | |
399 | new_sock = -1; | |
400 | } | |
401 | ||
402 | exit: | |
403 | error: | |
404 | if (err) { | |
405 | ERR("Health error occurred in %s", __func__); | |
406 | } | |
407 | DBG("Health check thread dying"); | |
408 | unlink(health_unix_sock_path); | |
409 | if (sock >= 0) { | |
410 | ret = close(sock); | |
411 | if (ret) { | |
412 | PERROR("close"); | |
413 | } | |
414 | } | |
415 | ||
dcbcae3e MD |
416 | /* |
417 | * We do NOT rmdir rundir nor the relayd path because there are | |
418 | * other processes using them. | |
419 | */ | |
420 | ||
65931c8b MD |
421 | lttng_poll_clean(&events); |
422 | ||
423 | rcu_unregister_thread(); | |
424 | return NULL; | |
425 | } |