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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 | |
19 | #include <fcntl.h> | |
20 | #include <getopt.h> | |
21 | #include <grp.h> | |
22 | #include <limits.h> | |
23 | #include <pthread.h> | |
24 | #include <signal.h> | |
25 | #include <stdio.h> | |
26 | #include <stdlib.h> | |
27 | #include <string.h> | |
28 | #include <sys/ipc.h> | |
29 | #include <sys/resource.h> | |
30 | #include <sys/shm.h> | |
31 | #include <sys/socket.h> | |
32 | #include <sys/stat.h> | |
33 | #include <sys/types.h> | |
34 | #include <urcu/list.h> | |
35 | #include <poll.h> | |
36 | #include <unistd.h> | |
37 | #include <sys/mman.h> | |
38 | #include <assert.h> | |
39 | #include <config.h> | |
40 | #include <urcu/compiler.h> | |
41 | #include <ulimit.h> | |
42 | #include <inttypes.h> | |
43 | ||
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> | |
51 | ||
52 | #include "lttng-relayd.h" | |
53 | #include "health-relayd.h" | |
54 | ||
55 | /* Global health check unix path */ | |
56 | static char health_unix_sock_path[PATH_MAX]; | |
3f28e561 DG |
57 | static char *relayd_path; |
58 | static char *lttng_rundir; | |
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 | ||
134 | static | |
135 | int setup_health_path(void) | |
136 | { | |
137 | int is_root, ret = 0; | |
3f28e561 | 138 | char *home_path = NULL; |
65931c8b MD |
139 | |
140 | is_root = !getuid(); | |
141 | ||
142 | if (is_root) { | |
3f28e561 | 143 | lttng_rundir = strdup(DEFAULT_LTTNG_RUNDIR); |
65931c8b MD |
144 | } else { |
145 | /* | |
146 | * Create rundir from home path. This will create something like | |
147 | * $HOME/.lttng | |
148 | */ | |
149 | home_path = utils_get_home_dir(); | |
150 | ||
151 | if (home_path == NULL) { | |
152 | /* TODO: Add --socket PATH option */ | |
153 | ERR("Can't get HOME directory for sockets creation."); | |
154 | ret = -EPERM; | |
155 | goto end; | |
156 | } | |
157 | ||
3f28e561 | 158 | ret = asprintf(<tng_rundir, DEFAULT_LTTNG_HOME_RUNDIR, home_path); |
65931c8b MD |
159 | if (ret < 0) { |
160 | ret = -ENOMEM; | |
161 | goto end; | |
162 | } | |
163 | } | |
164 | ||
3f28e561 | 165 | ret = asprintf(&relayd_path, DEFAULT_RELAYD_PATH, lttng_rundir); |
65931c8b MD |
166 | if (ret < 0) { |
167 | ret = -ENOMEM; | |
168 | goto end; | |
169 | } | |
170 | ||
3f28e561 | 171 | ret = create_lttng_rundir_with_perm(lttng_rundir); |
65931c8b MD |
172 | if (ret < 0) { |
173 | goto end; | |
174 | } | |
175 | ||
176 | ret = create_lttng_rundir_with_perm(relayd_path); | |
177 | if (ret < 0) { | |
178 | goto end; | |
179 | } | |
180 | ||
181 | if (is_root) { | |
182 | if (strlen(health_unix_sock_path) != 0) { | |
183 | goto end; | |
184 | } | |
185 | snprintf(health_unix_sock_path, sizeof(health_unix_sock_path), | |
186 | DEFAULT_GLOBAL_RELAY_HEALTH_UNIX_SOCK, | |
187 | getpid()); | |
188 | } else { | |
189 | /* Set health check Unix path */ | |
190 | if (strlen(health_unix_sock_path) != 0) { | |
191 | goto end; | |
192 | } | |
193 | ||
194 | snprintf(health_unix_sock_path, sizeof(health_unix_sock_path), | |
195 | DEFAULT_HOME_RELAY_HEALTH_UNIX_SOCK, | |
196 | home_path, getpid()); | |
197 | } | |
198 | ||
199 | end: | |
200 | return ret; | |
201 | } | |
202 | ||
203 | /* | |
204 | * Thread managing health check socket. | |
205 | */ | |
206 | void *thread_manage_health(void *data) | |
207 | { | |
208 | int sock = -1, new_sock = -1, ret, i, pollfd, err = -1; | |
209 | uint32_t revents, nb_fd; | |
210 | struct lttng_poll_event events; | |
211 | struct health_comm_msg msg; | |
212 | struct health_comm_reply reply; | |
213 | int is_root; | |
214 | ||
215 | DBG("[thread] Manage health check started"); | |
216 | ||
217 | setup_health_path(); | |
218 | ||
219 | rcu_register_thread(); | |
220 | ||
221 | /* We might hit an error path before this is created. */ | |
222 | lttng_poll_init(&events); | |
223 | ||
224 | /* Create unix socket */ | |
225 | sock = lttcomm_create_unix_sock(health_unix_sock_path); | |
226 | if (sock < 0) { | |
227 | ERR("Unable to create health check Unix socket"); | |
228 | ret = -1; | |
229 | goto error; | |
230 | } | |
231 | ||
232 | is_root = !getuid(); | |
233 | if (is_root) { | |
234 | /* lttng health client socket path permissions */ | |
235 | ret = chown(health_unix_sock_path, 0, | |
236 | utils_get_group_id(tracing_group_name)); | |
237 | if (ret < 0) { | |
238 | ERR("Unable to set group on %s", health_unix_sock_path); | |
239 | PERROR("chown"); | |
240 | ret = -1; | |
241 | goto error; | |
242 | } | |
243 | ||
244 | ret = chmod(health_unix_sock_path, | |
245 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
246 | if (ret < 0) { | |
247 | ERR("Unable to set permissions on %s", health_unix_sock_path); | |
248 | PERROR("chmod"); | |
249 | ret = -1; | |
250 | goto error; | |
251 | } | |
252 | } | |
253 | ||
254 | /* | |
255 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
256 | * show must go on. | |
257 | */ | |
258 | (void) utils_set_fd_cloexec(sock); | |
259 | ||
260 | ret = lttcomm_listen_unix_sock(sock); | |
261 | if (ret < 0) { | |
262 | goto error; | |
263 | } | |
264 | ||
265 | /* Size is set to 1 for the consumer_channel pipe */ | |
266 | ret = lttng_poll_create(&events, 2, LTTNG_CLOEXEC); | |
267 | if (ret < 0) { | |
268 | ERR("Poll set creation failed"); | |
269 | goto error; | |
270 | } | |
271 | ||
272 | ret = lttng_poll_add(&events, health_quit_pipe[0], LPOLLIN); | |
273 | if (ret < 0) { | |
274 | goto error; | |
275 | } | |
276 | ||
277 | /* Add the application registration socket */ | |
278 | ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLPRI); | |
279 | if (ret < 0) { | |
280 | goto error; | |
281 | } | |
282 | ||
283 | while (1) { | |
284 | DBG("Health check ready"); | |
285 | ||
286 | /* Inifinite blocking call, waiting for transmission */ | |
287 | restart: | |
288 | ret = lttng_poll_wait(&events, -1); | |
289 | if (ret < 0) { | |
290 | /* | |
291 | * Restart interrupted system call. | |
292 | */ | |
293 | if (errno == EINTR) { | |
294 | goto restart; | |
295 | } | |
296 | goto error; | |
297 | } | |
298 | ||
299 | nb_fd = ret; | |
300 | ||
301 | for (i = 0; i < nb_fd; i++) { | |
302 | /* Fetch once the poll data */ | |
303 | revents = LTTNG_POLL_GETEV(&events, i); | |
304 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
305 | ||
306 | /* Thread quit pipe has been closed. Killing thread. */ | |
307 | ret = check_health_quit_pipe(pollfd, revents); | |
308 | if (ret) { | |
309 | err = 0; | |
310 | goto exit; | |
311 | } | |
312 | ||
313 | /* Event on the registration socket */ | |
314 | if (pollfd == sock) { | |
315 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
316 | ERR("Health socket poll error"); | |
317 | goto error; | |
318 | } | |
319 | } | |
320 | } | |
321 | ||
322 | new_sock = lttcomm_accept_unix_sock(sock); | |
323 | if (new_sock < 0) { | |
324 | goto error; | |
325 | } | |
326 | ||
327 | /* | |
328 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
329 | * show must go on. | |
330 | */ | |
331 | (void) utils_set_fd_cloexec(new_sock); | |
332 | ||
333 | DBG("Receiving data from client for health..."); | |
334 | ret = lttcomm_recv_unix_sock(new_sock, (void *)&msg, sizeof(msg)); | |
335 | if (ret <= 0) { | |
336 | DBG("Nothing recv() from client... continuing"); | |
337 | ret = close(new_sock); | |
338 | if (ret) { | |
339 | PERROR("close"); | |
340 | } | |
341 | new_sock = -1; | |
342 | continue; | |
343 | } | |
344 | ||
345 | rcu_thread_online(); | |
346 | ||
347 | assert(msg.cmd == HEALTH_CMD_CHECK); | |
348 | ||
349 | reply.ret_code = 0; | |
350 | for (i = 0; i < NR_HEALTH_RELAYD_TYPES; i++) { | |
351 | /* | |
352 | * health_check_state return 0 if thread is in | |
353 | * error. | |
354 | */ | |
355 | if (!health_check_state(health_relayd, i)) { | |
356 | reply.ret_code |= 1ULL << i; | |
357 | } | |
358 | } | |
359 | ||
360 | DBG2("Health check return value %" PRIx64, reply.ret_code); | |
361 | ||
362 | ret = send_unix_sock(new_sock, (void *) &reply, sizeof(reply)); | |
363 | if (ret < 0) { | |
364 | ERR("Failed to send health data back to client"); | |
365 | } | |
366 | ||
367 | /* End of transmission */ | |
368 | ret = close(new_sock); | |
369 | if (ret) { | |
370 | PERROR("close"); | |
371 | } | |
372 | new_sock = -1; | |
373 | } | |
374 | ||
375 | exit: | |
376 | error: | |
377 | if (err) { | |
378 | ERR("Health error occurred in %s", __func__); | |
379 | } | |
380 | DBG("Health check thread dying"); | |
381 | unlink(health_unix_sock_path); | |
3f28e561 DG |
382 | (void) rmdir(relayd_path); |
383 | free(relayd_path); | |
384 | (void) rmdir(lttng_rundir); | |
385 | free(lttng_rundir); | |
386 | ||
65931c8b MD |
387 | if (sock >= 0) { |
388 | ret = close(sock); | |
389 | if (ret) { | |
390 | PERROR("close"); | |
391 | } | |
392 | } | |
393 | ||
394 | lttng_poll_clean(&events); | |
395 | ||
396 | rcu_unregister_thread(); | |
397 | return NULL; | |
398 | } |