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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> | |
42 | ||
43 | #include <common/defaults.h> | |
44 | #include <common/common.h> | |
45 | #include <common/consumer.h> | |
46 | #include <common/consumer-timer.h> | |
47 | #include <common/compat/poll.h> | |
48 | #include <common/sessiond-comm/sessiond-comm.h> | |
49 | #include <common/utils.h> | |
50 | ||
51 | #include "lttng-consumerd.h" | |
52 | #include "health-consumerd.h" | |
53 | ||
54 | /* Global health check unix path */ | |
55 | static char health_unix_sock_path[PATH_MAX]; | |
56 | ||
57 | int health_quit_pipe[2]; | |
58 | ||
59 | /* | |
60 | * Check if the thread quit pipe was triggered. | |
61 | * | |
62 | * Return 1 if it was triggered else 0; | |
63 | */ | |
64 | static | |
65 | int check_health_quit_pipe(int fd, uint32_t events) | |
66 | { | |
67 | if (fd == health_quit_pipe[0] && (events & LPOLLIN)) { | |
68 | return 1; | |
69 | } | |
70 | ||
71 | return 0; | |
72 | } | |
73 | ||
74 | /* | |
75 | * Send data on a unix socket using the liblttsessiondcomm API. | |
76 | * | |
77 | * Return lttcomm error code. | |
78 | */ | |
79 | static int send_unix_sock(int sock, void *buf, size_t len) | |
80 | { | |
81 | /* Check valid length */ | |
82 | if (len == 0) { | |
83 | return -1; | |
84 | } | |
85 | ||
86 | return lttcomm_send_unix_sock(sock, buf, len); | |
87 | } | |
88 | ||
89 | static | |
90 | int setup_health_path(void) | |
91 | { | |
92 | int is_root, ret = 0; | |
93 | enum lttng_consumer_type type; | |
94 | const char *home_path; | |
95 | ||
96 | type = lttng_consumer_get_type(); | |
97 | is_root = !getuid(); | |
98 | ||
99 | if (is_root) { | |
100 | if (strlen(health_unix_sock_path) != 0) { | |
101 | goto end; | |
102 | } | |
103 | switch (type) { | |
104 | case LTTNG_CONSUMER_KERNEL: | |
105 | snprintf(health_unix_sock_path, sizeof(health_unix_sock_path), | |
106 | DEFAULT_GLOBAL_KCONSUMER_HEALTH_UNIX_SOCK); | |
107 | break; | |
108 | case LTTNG_CONSUMER64_UST: | |
109 | snprintf(health_unix_sock_path, sizeof(health_unix_sock_path), | |
110 | DEFAULT_GLOBAL_USTCONSUMER64_HEALTH_UNIX_SOCK); | |
111 | break; | |
112 | case LTTNG_CONSUMER32_UST: | |
113 | snprintf(health_unix_sock_path, sizeof(health_unix_sock_path), | |
114 | DEFAULT_GLOBAL_USTCONSUMER32_HEALTH_UNIX_SOCK); | |
115 | break; | |
116 | default: | |
117 | ret = -EINVAL; | |
118 | goto end; | |
119 | } | |
120 | } else { | |
121 | static char *rundir; | |
122 | ||
123 | home_path = utils_get_home_dir(); | |
124 | if (home_path == NULL) { | |
125 | /* TODO: Add --socket PATH option */ | |
126 | ERR("Can't get HOME directory for sockets creation."); | |
127 | ret = -EPERM; | |
128 | goto end; | |
129 | } | |
130 | ||
131 | /* | |
132 | * Create rundir from home path. This will create something like | |
133 | * $HOME/.lttng | |
134 | */ | |
135 | ret = asprintf(&rundir, DEFAULT_LTTNG_HOME_RUNDIR, home_path); | |
136 | if (ret < 0) { | |
137 | ret = -ENOMEM; | |
138 | goto end; | |
139 | } | |
140 | ||
141 | /* Set health check Unix path */ | |
142 | if (strlen(health_unix_sock_path) != 0) { | |
143 | goto end; | |
144 | } | |
145 | switch (type) { | |
146 | case LTTNG_CONSUMER_KERNEL: | |
147 | snprintf(health_unix_sock_path, sizeof(health_unix_sock_path), | |
148 | DEFAULT_HOME_KCONSUMER_HEALTH_UNIX_SOCK, rundir); | |
149 | break; | |
150 | case LTTNG_CONSUMER64_UST: | |
151 | snprintf(health_unix_sock_path, sizeof(health_unix_sock_path), | |
152 | DEFAULT_HOME_USTCONSUMER64_HEALTH_UNIX_SOCK, rundir); | |
153 | break; | |
154 | case LTTNG_CONSUMER32_UST: | |
155 | snprintf(health_unix_sock_path, sizeof(health_unix_sock_path), | |
156 | DEFAULT_HOME_USTCONSUMER32_HEALTH_UNIX_SOCK, rundir); | |
157 | break; | |
158 | default: | |
159 | ret = -EINVAL; | |
160 | goto end; | |
161 | } | |
162 | } | |
163 | ||
164 | end: | |
165 | return ret; | |
166 | } | |
167 | ||
168 | /* | |
169 | * Thread managing health check socket. | |
170 | */ | |
171 | void *thread_manage_health(void *data) | |
172 | { | |
173 | int sock = -1, new_sock = -1, ret, i, pollfd, err = -1; | |
174 | uint32_t revents, nb_fd; | |
175 | struct lttng_poll_event events; | |
176 | struct health_comm_msg msg; | |
177 | struct health_comm_reply reply; | |
178 | ||
179 | DBG("[thread] Manage health check started"); | |
180 | ||
181 | setup_health_path(); | |
182 | ||
183 | rcu_register_thread(); | |
184 | ||
185 | /* We might hit an error path before this is created. */ | |
186 | lttng_poll_init(&events); | |
187 | ||
188 | /* Create unix socket */ | |
189 | sock = lttcomm_create_unix_sock(health_unix_sock_path); | |
190 | if (sock < 0) { | |
191 | ERR("Unable to create health check Unix socket"); | |
192 | ret = -1; | |
193 | goto error; | |
194 | } | |
195 | ||
196 | /* | |
197 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
198 | * show must go on. | |
199 | */ | |
200 | (void) utils_set_fd_cloexec(sock); | |
201 | ||
202 | ret = lttcomm_listen_unix_sock(sock); | |
203 | if (ret < 0) { | |
204 | goto error; | |
205 | } | |
206 | ||
207 | /* Size is set to 1 for the consumer_channel pipe */ | |
208 | ret = lttng_poll_create(&events, 2, LTTNG_CLOEXEC); | |
209 | if (ret < 0) { | |
210 | ERR("Poll set creation failed"); | |
211 | goto error; | |
212 | } | |
213 | ||
214 | ret = lttng_poll_add(&events, health_quit_pipe[0], LPOLLIN); | |
215 | if (ret < 0) { | |
216 | goto error; | |
217 | } | |
218 | ||
219 | /* Add the application registration socket */ | |
220 | ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLPRI); | |
221 | if (ret < 0) { | |
222 | goto error; | |
223 | } | |
224 | ||
225 | while (1) { | |
226 | DBG("Health check ready"); | |
227 | ||
228 | /* Inifinite blocking call, waiting for transmission */ | |
229 | restart: | |
230 | ret = lttng_poll_wait(&events, -1); | |
231 | if (ret < 0) { | |
232 | /* | |
233 | * Restart interrupted system call. | |
234 | */ | |
235 | if (errno == EINTR) { | |
236 | goto restart; | |
237 | } | |
238 | goto error; | |
239 | } | |
240 | ||
241 | nb_fd = ret; | |
242 | ||
243 | for (i = 0; i < nb_fd; i++) { | |
244 | /* Fetch once the poll data */ | |
245 | revents = LTTNG_POLL_GETEV(&events, i); | |
246 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
247 | ||
248 | /* Thread quit pipe has been closed. Killing thread. */ | |
249 | ret = check_health_quit_pipe(pollfd, revents); | |
250 | if (ret) { | |
251 | err = 0; | |
252 | goto exit; | |
253 | } | |
254 | ||
255 | /* Event on the registration socket */ | |
256 | if (pollfd == sock) { | |
257 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
258 | ERR("Health socket poll error"); | |
259 | goto error; | |
260 | } | |
261 | } | |
262 | } | |
263 | ||
264 | new_sock = lttcomm_accept_unix_sock(sock); | |
265 | if (new_sock < 0) { | |
266 | goto error; | |
267 | } | |
268 | ||
269 | /* | |
270 | * Set the CLOEXEC flag. Return code is useless because either way, the | |
271 | * show must go on. | |
272 | */ | |
273 | (void) utils_set_fd_cloexec(new_sock); | |
274 | ||
275 | DBG("Receiving data from client for health..."); | |
276 | ret = lttcomm_recv_unix_sock(new_sock, (void *)&msg, sizeof(msg)); | |
277 | if (ret <= 0) { | |
278 | DBG("Nothing recv() from client... continuing"); | |
279 | ret = close(new_sock); | |
280 | if (ret) { | |
281 | PERROR("close"); | |
282 | } | |
283 | new_sock = -1; | |
284 | continue; | |
285 | } | |
286 | ||
287 | rcu_thread_online(); | |
288 | ||
289 | assert(msg.cmd == HEALTH_CMD_CHECK); | |
290 | ||
291 | switch (msg.component) { | |
292 | case LTTNG_HEALTH_CONSUMERD_CHANNEL: | |
293 | reply.ret_code = health_check_state(health_consumerd, HEALTH_CONSUMERD_TYPE_CHANNEL); | |
294 | break; | |
295 | case LTTNG_HEALTH_CONSUMERD_METADATA: | |
296 | reply.ret_code = health_check_state(health_consumerd, HEALTH_CONSUMERD_TYPE_METADATA); | |
297 | break; | |
298 | case LTTNG_HEALTH_CONSUMERD_DATA: | |
299 | reply.ret_code = health_check_state(health_consumerd, HEALTH_CONSUMERD_TYPE_DATA); | |
300 | break; | |
301 | case LTTNG_HEALTH_CONSUMERD_SESSIOND: | |
302 | reply.ret_code = health_check_state(health_consumerd, HEALTH_CONSUMERD_TYPE_SESSIOND); | |
303 | break; | |
304 | case LTTNG_HEALTH_CONSUMERD_METADATA_TIMER: | |
305 | reply.ret_code = health_check_state(health_consumerd, HEALTH_CONSUMERD_TYPE_METADATA_TIMER); | |
306 | break; | |
307 | ||
308 | case LTTNG_HEALTH_CONSUMERD_ALL: | |
309 | reply.ret_code = | |
310 | health_check_state(health_consumerd, HEALTH_CONSUMERD_TYPE_CHANNEL) && | |
311 | health_check_state(health_consumerd, HEALTH_CONSUMERD_TYPE_METADATA) && | |
312 | health_check_state(health_consumerd, HEALTH_CONSUMERD_TYPE_DATA) && | |
313 | health_check_state(health_consumerd, HEALTH_CONSUMERD_TYPE_SESSIOND) && | |
314 | health_check_state(health_consumerd, HEALTH_CONSUMERD_TYPE_METADATA_TIMER); | |
315 | break; | |
316 | default: | |
317 | reply.ret_code = LTTNG_ERR_UND; | |
318 | break; | |
319 | } | |
320 | ||
321 | /* | |
322 | * Flip ret value since 0 is a success and 1 indicates a bad health for | |
323 | * the client where in the sessiond it is the opposite. Again, this is | |
324 | * just to make things easier for us poor developer which enjoy a lot | |
325 | * lazyness. | |
326 | */ | |
327 | if (reply.ret_code == 0 || reply.ret_code == 1) { | |
328 | reply.ret_code = !reply.ret_code; | |
329 | } | |
330 | ||
331 | DBG2("Health check return value %d", reply.ret_code); | |
332 | ||
333 | ret = send_unix_sock(new_sock, (void *) &reply, sizeof(reply)); | |
334 | if (ret < 0) { | |
335 | ERR("Failed to send health data back to client"); | |
336 | } | |
337 | ||
338 | /* End of transmission */ | |
339 | ret = close(new_sock); | |
340 | if (ret) { | |
341 | PERROR("close"); | |
342 | } | |
343 | new_sock = -1; | |
344 | } | |
345 | ||
346 | exit: | |
347 | error: | |
348 | if (err) { | |
349 | ERR("Health error occurred in %s", __func__); | |
350 | } | |
351 | DBG("Health check thread dying"); | |
352 | unlink(health_unix_sock_path); | |
353 | if (sock >= 0) { | |
354 | ret = close(sock); | |
355 | if (ret) { | |
356 | PERROR("close"); | |
357 | } | |
358 | } | |
359 | ||
360 | lttng_poll_clean(&events); | |
361 | ||
362 | rcu_unregister_thread(); | |
363 | return NULL; | |
364 | } |