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5c635c72 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> | |
6c71277b | 42 | #include <inttypes.h> |
5c635c72 MD |
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-consumerd.h" | |
53 | #include "health-consumerd.h" | |
54 | ||
55 | /* Global health check unix path */ | |
56 | static char health_unix_sock_path[PATH_MAX]; | |
57 | ||
58 | int health_quit_pipe[2]; | |
59 | ||
60 | /* | |
61 | * Check if the thread quit pipe was triggered. | |
62 | * | |
63 | * Return 1 if it was triggered else 0; | |
64 | */ | |
65 | static | |
66 | int check_health_quit_pipe(int fd, uint32_t events) | |
67 | { | |
68 | if (fd == health_quit_pipe[0] && (events & LPOLLIN)) { | |
69 | return 1; | |
70 | } | |
71 | ||
72 | return 0; | |
73 | } | |
74 | ||
75 | /* | |
76 | * Send data on a unix socket using the liblttsessiondcomm API. | |
77 | * | |
78 | * Return lttcomm error code. | |
79 | */ | |
80 | static int send_unix_sock(int sock, void *buf, size_t len) | |
81 | { | |
82 | /* Check valid length */ | |
83 | if (len == 0) { | |
84 | return -1; | |
85 | } | |
86 | ||
87 | return lttcomm_send_unix_sock(sock, buf, len); | |
88 | } | |
89 | ||
90 | static | |
91 | int setup_health_path(void) | |
92 | { | |
93 | int is_root, ret = 0; | |
94 | enum lttng_consumer_type type; | |
95 | const char *home_path; | |
96 | ||
97 | type = lttng_consumer_get_type(); | |
98 | is_root = !getuid(); | |
99 | ||
100 | if (is_root) { | |
101 | if (strlen(health_unix_sock_path) != 0) { | |
102 | goto end; | |
103 | } | |
104 | switch (type) { | |
105 | case LTTNG_CONSUMER_KERNEL: | |
106 | snprintf(health_unix_sock_path, sizeof(health_unix_sock_path), | |
107 | DEFAULT_GLOBAL_KCONSUMER_HEALTH_UNIX_SOCK); | |
108 | break; | |
109 | case LTTNG_CONSUMER64_UST: | |
110 | snprintf(health_unix_sock_path, sizeof(health_unix_sock_path), | |
111 | DEFAULT_GLOBAL_USTCONSUMER64_HEALTH_UNIX_SOCK); | |
112 | break; | |
113 | case LTTNG_CONSUMER32_UST: | |
114 | snprintf(health_unix_sock_path, sizeof(health_unix_sock_path), | |
115 | DEFAULT_GLOBAL_USTCONSUMER32_HEALTH_UNIX_SOCK); | |
116 | break; | |
117 | default: | |
118 | ret = -EINVAL; | |
119 | goto end; | |
120 | } | |
121 | } else { | |
5c635c72 MD |
122 | home_path = utils_get_home_dir(); |
123 | if (home_path == NULL) { | |
124 | /* TODO: Add --socket PATH option */ | |
125 | ERR("Can't get HOME directory for sockets creation."); | |
126 | ret = -EPERM; | |
127 | goto end; | |
128 | } | |
129 | ||
5c635c72 MD |
130 | /* Set health check Unix path */ |
131 | if (strlen(health_unix_sock_path) != 0) { | |
132 | goto end; | |
133 | } | |
134 | switch (type) { | |
135 | case LTTNG_CONSUMER_KERNEL: | |
136 | snprintf(health_unix_sock_path, sizeof(health_unix_sock_path), | |
dbc8403d | 137 | DEFAULT_HOME_KCONSUMER_HEALTH_UNIX_SOCK, home_path); |
5c635c72 MD |
138 | break; |
139 | case LTTNG_CONSUMER64_UST: | |
140 | snprintf(health_unix_sock_path, sizeof(health_unix_sock_path), | |
dbc8403d | 141 | DEFAULT_HOME_USTCONSUMER64_HEALTH_UNIX_SOCK, home_path); |
5c635c72 MD |
142 | break; |
143 | case LTTNG_CONSUMER32_UST: | |
144 | snprintf(health_unix_sock_path, sizeof(health_unix_sock_path), | |
dbc8403d | 145 | DEFAULT_HOME_USTCONSUMER32_HEALTH_UNIX_SOCK, home_path); |
5c635c72 MD |
146 | break; |
147 | default: | |
148 | ret = -EINVAL; | |
149 | goto end; | |
150 | } | |
151 | } | |
5c635c72 MD |
152 | end: |
153 | return ret; | |
154 | } | |
155 | ||
156 | /* | |
157 | * Thread managing health check socket. | |
158 | */ | |
159 | void *thread_manage_health(void *data) | |
160 | { | |
161 | int sock = -1, new_sock = -1, ret, i, pollfd, err = -1; | |
162 | uint32_t revents, nb_fd; | |
163 | struct lttng_poll_event events; | |
164 | struct health_comm_msg msg; | |
165 | struct health_comm_reply reply; | |
6c71277b | 166 | int is_root; |
5c635c72 MD |
167 | |
168 | DBG("[thread] Manage health check started"); | |
169 | ||
170 | setup_health_path(); | |
171 | ||
172 | rcu_register_thread(); | |
173 | ||
174 | /* We might hit an error path before this is created. */ | |
175 | lttng_poll_init(&events); | |
176 | ||
177 | /* Create unix socket */ | |
178 | sock = lttcomm_create_unix_sock(health_unix_sock_path); | |
179 | if (sock < 0) { | |
180 | ERR("Unable to create health check Unix socket"); | |
181 | ret = -1; | |
182 | goto error; | |
183 | } | |
184 | ||
6c71277b MD |
185 | is_root = !getuid(); |
186 | if (is_root) { | |
187 | /* lttng health client socket path permissions */ | |
188 | ret = chown(health_unix_sock_path, 0, | |
189 | utils_get_group_id(tracing_group_name)); | |
190 | if (ret < 0) { | |
191 | ERR("Unable to set group on %s", health_unix_sock_path); | |
192 | PERROR("chown"); | |
193 | ret = -1; | |
194 | goto error; | |
195 | } | |
196 | ||
197 | ret = chmod(health_unix_sock_path, | |
198 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
199 | if (ret < 0) { | |
200 | ERR("Unable to set permissions on %s", health_unix_sock_path); | |
201 | PERROR("chmod"); | |
202 | ret = -1; | |
203 | goto error; | |
204 | } | |
205 | } | |
206 | ||
5c635c72 MD |
207 | /* |
208 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
209 | * show must go on. | |
210 | */ | |
211 | (void) utils_set_fd_cloexec(sock); | |
212 | ||
213 | ret = lttcomm_listen_unix_sock(sock); | |
214 | if (ret < 0) { | |
215 | goto error; | |
216 | } | |
217 | ||
218 | /* Size is set to 1 for the consumer_channel pipe */ | |
219 | ret = lttng_poll_create(&events, 2, LTTNG_CLOEXEC); | |
220 | if (ret < 0) { | |
221 | ERR("Poll set creation failed"); | |
222 | goto error; | |
223 | } | |
224 | ||
225 | ret = lttng_poll_add(&events, health_quit_pipe[0], LPOLLIN); | |
226 | if (ret < 0) { | |
227 | goto error; | |
228 | } | |
229 | ||
230 | /* Add the application registration socket */ | |
231 | ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLPRI); | |
232 | if (ret < 0) { | |
233 | goto error; | |
234 | } | |
235 | ||
748b7b07 MD |
236 | /* Perform prior memory accesses before decrementing ready */ |
237 | cmm_smp_mb__before_uatomic_dec(); | |
238 | uatomic_dec(<tng_consumer_ready); | |
239 | ||
5c635c72 MD |
240 | while (1) { |
241 | DBG("Health check ready"); | |
242 | ||
243 | /* Inifinite blocking call, waiting for transmission */ | |
244 | restart: | |
245 | ret = lttng_poll_wait(&events, -1); | |
246 | if (ret < 0) { | |
247 | /* | |
248 | * Restart interrupted system call. | |
249 | */ | |
250 | if (errno == EINTR) { | |
251 | goto restart; | |
252 | } | |
253 | goto error; | |
254 | } | |
255 | ||
256 | nb_fd = ret; | |
257 | ||
258 | for (i = 0; i < nb_fd; i++) { | |
259 | /* Fetch once the poll data */ | |
260 | revents = LTTNG_POLL_GETEV(&events, i); | |
261 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
262 | ||
263 | /* Thread quit pipe has been closed. Killing thread. */ | |
264 | ret = check_health_quit_pipe(pollfd, revents); | |
265 | if (ret) { | |
266 | err = 0; | |
267 | goto exit; | |
268 | } | |
269 | ||
270 | /* Event on the registration socket */ | |
271 | if (pollfd == sock) { | |
272 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
273 | ERR("Health socket poll error"); | |
274 | goto error; | |
275 | } | |
276 | } | |
277 | } | |
278 | ||
279 | new_sock = lttcomm_accept_unix_sock(sock); | |
280 | if (new_sock < 0) { | |
281 | goto error; | |
282 | } | |
283 | ||
284 | /* | |
285 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
286 | * show must go on. | |
287 | */ | |
288 | (void) utils_set_fd_cloexec(new_sock); | |
289 | ||
290 | DBG("Receiving data from client for health..."); | |
291 | ret = lttcomm_recv_unix_sock(new_sock, (void *)&msg, sizeof(msg)); | |
292 | if (ret <= 0) { | |
293 | DBG("Nothing recv() from client... continuing"); | |
294 | ret = close(new_sock); | |
295 | if (ret) { | |
296 | PERROR("close"); | |
297 | } | |
298 | new_sock = -1; | |
299 | continue; | |
300 | } | |
301 | ||
302 | rcu_thread_online(); | |
303 | ||
304 | assert(msg.cmd == HEALTH_CMD_CHECK); | |
305 | ||
53efb85a | 306 | memset(&reply, 0, sizeof(reply)); |
6c71277b MD |
307 | for (i = 0; i < NR_HEALTH_CONSUMERD_TYPES; i++) { |
308 | /* | |
309 | * health_check_state return 0 if thread is in | |
310 | * error. | |
311 | */ | |
312 | if (!health_check_state(health_consumerd, i)) { | |
313 | reply.ret_code |= 1ULL << i; | |
314 | } | |
5c635c72 MD |
315 | } |
316 | ||
6137f630 | 317 | DBG("Health check return value %" PRIx64, reply.ret_code); |
5c635c72 MD |
318 | |
319 | ret = send_unix_sock(new_sock, (void *) &reply, sizeof(reply)); | |
320 | if (ret < 0) { | |
321 | ERR("Failed to send health data back to client"); | |
322 | } | |
323 | ||
324 | /* End of transmission */ | |
325 | ret = close(new_sock); | |
326 | if (ret) { | |
327 | PERROR("close"); | |
328 | } | |
329 | new_sock = -1; | |
330 | } | |
331 | ||
332 | exit: | |
333 | error: | |
334 | if (err) { | |
335 | ERR("Health error occurred in %s", __func__); | |
336 | } | |
337 | DBG("Health check thread dying"); | |
338 | unlink(health_unix_sock_path); | |
339 | if (sock >= 0) { | |
340 | ret = close(sock); | |
341 | if (ret) { | |
342 | PERROR("close"); | |
343 | } | |
344 | } | |
345 | ||
346 | lttng_poll_clean(&events); | |
347 | ||
348 | rcu_unregister_thread(); | |
349 | return NULL; | |
350 | } |