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6c71277b MD |
1 | /* |
2 | * lttng-ctl-health.c | |
3 | * | |
4 | * Linux Trace Toolkit Health Control Library | |
5 | * | |
6 | * Copyright (C) 2011 David Goulet <david.goulet@polymtl.ca> | |
7 | * Copyright (C) 2013 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
8 | * | |
9 | * This library is free software; you can redistribute it and/or modify it | |
10 | * under the terms of the GNU Lesser General Public License, version 2.1 only, | |
11 | * as published by the Free Software Foundation. | |
12 | * | |
13 | * This library is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | * Lesser General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU Lesser General Public License | |
19 | * along with this library; if not, write to the Free Software Foundation, | |
20 | * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
21 | */ | |
22 | ||
6c1c0768 MD |
23 | #define _GNU_SOURCE |
24 | #define _LGPL_SOURCE | |
6c71277b MD |
25 | #include <unistd.h> |
26 | #include <sys/types.h> | |
27 | #include <stdint.h> | |
28 | #include <limits.h> | |
29 | #include <errno.h> | |
30 | #include <lttng/health-internal.h> | |
31 | ||
32 | #include <bin/lttng-sessiond/health-sessiond.h> | |
33 | #include <bin/lttng-consumerd/health-consumerd.h> | |
34 | #include <bin/lttng-relayd/health-relayd.h> | |
35 | #include <common/defaults.h> | |
36 | #include <common/utils.h> | |
37 | ||
38 | #include "lttng-ctl-helper.h" | |
39 | ||
40 | enum health_component { | |
41 | HEALTH_COMPONENT_SESSIOND, | |
42 | HEALTH_COMPONENT_CONSUMERD, | |
43 | HEALTH_COMPONENT_RELAYD, | |
44 | ||
45 | NR_HEALTH_COMPONENT, | |
46 | }; | |
47 | ||
48 | struct lttng_health_thread { | |
49 | struct lttng_health *p; | |
50 | int state; | |
51 | }; | |
52 | ||
53 | struct lttng_health { | |
54 | enum health_component component; | |
55 | uint64_t state; | |
56 | unsigned int nr_threads; | |
57 | char health_sock_path[PATH_MAX]; | |
58 | /* For consumer health only */ | |
59 | enum lttng_health_consumerd consumerd_type; | |
60 | struct lttng_health_thread thread[]; | |
61 | }; | |
62 | ||
63 | static | |
64 | const char *sessiond_thread_name[NR_HEALTH_SESSIOND_TYPES] = { | |
65 | [ HEALTH_SESSIOND_TYPE_CMD ] = "Session daemon command", | |
66 | [ HEALTH_SESSIOND_TYPE_APP_MANAGE ] = "Session daemon application manager", | |
67 | [ HEALTH_SESSIOND_TYPE_APP_REG ] = "Session daemon application registration", | |
68 | [ HEALTH_SESSIOND_TYPE_KERNEL ] = "Session daemon kernel", | |
69 | [ HEALTH_SESSIOND_TYPE_CONSUMER ] = "Session daemon consumer manager", | |
70 | [ HEALTH_SESSIOND_TYPE_HT_CLEANUP ] = "Session daemon hash table cleanup", | |
71 | [ HEALTH_SESSIOND_TYPE_APP_MANAGE_NOTIFY ] = "Session daemon application notification manager", | |
72 | [ HEALTH_SESSIOND_TYPE_APP_REG_DISPATCH ] = "Session daemon application registration dispatcher", | |
73 | }; | |
74 | ||
75 | static | |
76 | const char *consumerd_thread_name[NR_HEALTH_CONSUMERD_TYPES] = { | |
77 | [ HEALTH_CONSUMERD_TYPE_CHANNEL ] = "Consumer daemon channel", | |
78 | [ HEALTH_CONSUMERD_TYPE_METADATA ] = "Consumer daemon metadata", | |
79 | [ HEALTH_CONSUMERD_TYPE_DATA ] = "Consumer daemon data", | |
80 | [ HEALTH_CONSUMERD_TYPE_SESSIOND ] = "Consumer daemon session daemon command manager", | |
81 | [ HEALTH_CONSUMERD_TYPE_METADATA_TIMER ] = "Consumer daemon metadata timer", | |
82 | }; | |
83 | ||
84 | static | |
85 | const char *relayd_thread_name[NR_HEALTH_RELAYD_TYPES] = { | |
86 | [ HEALTH_RELAYD_TYPE_DISPATCHER ] = "Relay daemon dispatcher", | |
87 | [ HEALTH_RELAYD_TYPE_WORKER ] = "Relay daemon worker", | |
88 | [ HEALTH_RELAYD_TYPE_LISTENER ] = "Relay daemon listener", | |
e7b0d526 MD |
89 | [ HEALTH_RELAYD_TYPE_LIVE_DISPATCHER ] = "Relay daemon live dispatcher", |
90 | [ HEALTH_RELAYD_TYPE_LIVE_WORKER ] = "Relay daemon live worker", | |
91 | [ HEALTH_RELAYD_TYPE_LIVE_LISTENER ] = "Relay daemon live listener", | |
6c71277b MD |
92 | }; |
93 | ||
94 | static | |
95 | const char **thread_name[NR_HEALTH_COMPONENT] = { | |
96 | [ HEALTH_COMPONENT_SESSIOND ] = sessiond_thread_name, | |
97 | [ HEALTH_COMPONENT_CONSUMERD] = consumerd_thread_name, | |
98 | [ HEALTH_COMPONENT_RELAYD ] = relayd_thread_name, | |
99 | }; | |
100 | ||
101 | /* | |
102 | * Set health socket path. | |
103 | * | |
104 | * Returns 0 on success or -ENOMEM. | |
105 | */ | |
106 | static | |
107 | int set_health_socket_path(struct lttng_health *lh, | |
108 | int tracing_group) | |
109 | { | |
110 | uid_t uid; | |
111 | const char *home; | |
112 | int ret; | |
113 | /* Global and home format strings */ | |
114 | const char *global_str, *home_str; | |
115 | ||
116 | switch (lh->component) { | |
117 | case HEALTH_COMPONENT_SESSIOND: | |
118 | global_str = DEFAULT_GLOBAL_HEALTH_UNIX_SOCK; | |
119 | home_str = DEFAULT_HOME_HEALTH_UNIX_SOCK; | |
120 | break; | |
121 | case HEALTH_COMPONENT_CONSUMERD: | |
122 | switch (lh->consumerd_type) { | |
123 | case LTTNG_HEALTH_CONSUMERD_UST_32: | |
124 | global_str = DEFAULT_GLOBAL_USTCONSUMER32_HEALTH_UNIX_SOCK; | |
125 | home_str = DEFAULT_HOME_USTCONSUMER32_HEALTH_UNIX_SOCK; | |
126 | break; | |
127 | case LTTNG_HEALTH_CONSUMERD_UST_64: | |
128 | global_str = DEFAULT_GLOBAL_USTCONSUMER64_HEALTH_UNIX_SOCK; | |
129 | home_str = DEFAULT_HOME_USTCONSUMER64_HEALTH_UNIX_SOCK; | |
130 | break; | |
131 | case LTTNG_HEALTH_CONSUMERD_KERNEL: | |
132 | global_str = DEFAULT_GLOBAL_KCONSUMER_HEALTH_UNIX_SOCK; | |
133 | home_str = DEFAULT_HOME_KCONSUMER_HEALTH_UNIX_SOCK; | |
134 | break; | |
135 | default: | |
136 | return -EINVAL; | |
137 | } | |
138 | break; | |
139 | case HEALTH_COMPONENT_RELAYD: | |
140 | if (lh->health_sock_path[0] == '\0') { | |
141 | return -EINVAL; | |
142 | } else { | |
143 | return 0; | |
144 | } | |
145 | break; /* Unreached */ | |
146 | default: | |
147 | return -EINVAL; | |
148 | } | |
149 | ||
150 | uid = getuid(); | |
151 | ||
152 | if (uid == 0 || tracing_group) { | |
153 | lttng_ctl_copy_string(lh->health_sock_path, | |
154 | global_str, | |
155 | sizeof(lh->health_sock_path)); | |
156 | return 0; | |
157 | } | |
158 | ||
159 | /* | |
160 | * With GNU C < 2.1, snprintf returns -1 if the target buffer | |
161 | * is too small; With GNU C >= 2.1, snprintf returns the | |
162 | * required size (excluding closing null). | |
163 | */ | |
164 | home = utils_get_home_dir(); | |
165 | if (home == NULL) { | |
166 | /* Fallback in /tmp */ | |
167 | home = "/tmp"; | |
168 | } | |
169 | ||
170 | ret = snprintf(lh->health_sock_path, sizeof(lh->health_sock_path), | |
171 | home_str, home); | |
172 | if ((ret < 0) || (ret >= sizeof(lh->health_sock_path))) { | |
173 | return -ENOMEM; | |
174 | } | |
175 | ||
176 | return 0; | |
177 | } | |
178 | ||
179 | static | |
180 | struct lttng_health *lttng_health_create(enum health_component hc, | |
181 | unsigned int nr_threads) | |
182 | { | |
183 | struct lttng_health *lh; | |
184 | int i; | |
185 | ||
186 | lh = zmalloc(sizeof(*lh) + sizeof(lh->thread[0]) * nr_threads); | |
187 | if (!lh) { | |
188 | return NULL; | |
189 | } | |
190 | ||
191 | lh->component = hc; | |
192 | lh->state = UINT64_MAX; /* All bits in error initially */ | |
193 | lh->nr_threads = nr_threads; | |
194 | for (i = 0; i < nr_threads; i++) { | |
195 | lh->thread[i].p = lh; | |
196 | } | |
197 | return lh; | |
198 | } | |
199 | ||
200 | struct lttng_health *lttng_health_create_sessiond(void) | |
201 | { | |
202 | struct lttng_health *lh; | |
203 | ||
204 | lh = lttng_health_create(HEALTH_COMPONENT_SESSIOND, | |
205 | NR_HEALTH_SESSIOND_TYPES); | |
206 | if (!lh) { | |
207 | return NULL; | |
208 | } | |
209 | return lh; | |
210 | } | |
211 | ||
212 | struct lttng_health * | |
213 | lttng_health_create_consumerd(enum lttng_health_consumerd consumerd) | |
214 | { | |
215 | struct lttng_health *lh; | |
216 | ||
217 | lh = lttng_health_create(HEALTH_COMPONENT_CONSUMERD, | |
218 | NR_HEALTH_CONSUMERD_TYPES); | |
219 | if (!lh) { | |
220 | return NULL; | |
221 | } | |
222 | lh->consumerd_type = consumerd; | |
223 | return lh; | |
224 | } | |
225 | ||
226 | struct lttng_health *lttng_health_create_relayd(const char *path) | |
227 | { | |
228 | struct lttng_health *lh; | |
229 | ||
230 | if (!path) { | |
231 | return NULL; | |
232 | } | |
233 | ||
234 | lh = lttng_health_create(HEALTH_COMPONENT_RELAYD, | |
235 | NR_HEALTH_RELAYD_TYPES); | |
236 | if (!lh) { | |
237 | return NULL; | |
238 | } | |
239 | lttng_ctl_copy_string(lh->health_sock_path, path, | |
240 | sizeof(lh->health_sock_path)); | |
241 | return lh; | |
242 | } | |
243 | ||
244 | void lttng_health_destroy(struct lttng_health *lh) | |
245 | { | |
246 | free(lh); | |
247 | } | |
248 | ||
249 | int lttng_health_query(struct lttng_health *health) | |
250 | { | |
251 | int sock, ret, i, tracing_group; | |
252 | struct health_comm_msg msg; | |
253 | struct health_comm_reply reply; | |
254 | ||
255 | if (!health) { | |
256 | return -EINVAL; | |
257 | } | |
258 | ||
259 | tracing_group = lttng_check_tracing_group(); | |
260 | retry: | |
261 | ret = set_health_socket_path(health, tracing_group); | |
262 | if (ret) { | |
263 | goto error; | |
264 | } | |
71d01237 | 265 | /* Connect to component */ |
6c71277b MD |
266 | sock = lttcomm_connect_unix_sock(health->health_sock_path); |
267 | if (sock < 0) { | |
268 | if (tracing_group) { | |
269 | /* For tracing group, fallback to per-user */ | |
270 | tracing_group = 0; | |
271 | goto retry; | |
272 | } | |
273 | ret = -1; | |
274 | goto error; | |
275 | } | |
276 | ||
53efb85a | 277 | memset(&msg, 0, sizeof(msg)); |
6c71277b MD |
278 | msg.cmd = HEALTH_CMD_CHECK; |
279 | ||
280 | ret = lttcomm_send_unix_sock(sock, (void *)&msg, sizeof(msg)); | |
281 | if (ret < 0) { | |
282 | ret = -1; | |
283 | goto close_error; | |
284 | } | |
285 | ||
286 | ret = lttcomm_recv_unix_sock(sock, (void *)&reply, sizeof(reply)); | |
287 | if (ret < 0) { | |
288 | ret = -1; | |
289 | goto close_error; | |
290 | } | |
291 | ||
292 | health->state = reply.ret_code; | |
293 | for (i = 0; i < health->nr_threads; i++) { | |
294 | if (health->state & (1ULL << i)) { | |
295 | health->thread[i].state = -1; | |
296 | } else { | |
297 | health->thread[i].state = 0; | |
298 | } | |
299 | } | |
300 | ||
301 | close_error: | |
302 | { | |
303 | int closeret; | |
304 | ||
305 | closeret = close(sock); | |
306 | assert(!closeret); | |
307 | } | |
308 | ||
309 | error: | |
310 | if (ret >= 0) | |
311 | ret = 0; | |
312 | return ret; | |
313 | } | |
314 | ||
315 | int lttng_health_state(const struct lttng_health *health) | |
316 | { | |
317 | if (!health) { | |
318 | return -EINVAL; | |
319 | } | |
320 | ||
321 | if (health->state == 0) { | |
322 | return 0; | |
323 | } else { | |
324 | return -1; | |
325 | } | |
326 | } | |
327 | ||
328 | int lttng_health_get_nr_threads(const struct lttng_health *health) | |
329 | { | |
330 | if (!health) { | |
331 | return -EINVAL; | |
332 | } | |
333 | return health->nr_threads; | |
334 | } | |
335 | ||
336 | const struct lttng_health_thread * | |
337 | lttng_health_get_thread(const struct lttng_health *health, | |
338 | unsigned int nth_thread) | |
339 | { | |
340 | if (!health || nth_thread >= health->nr_threads) { | |
341 | return NULL; | |
342 | } | |
343 | return &health->thread[nth_thread]; | |
344 | } | |
345 | ||
346 | int lttng_health_thread_state(const struct lttng_health_thread *thread) | |
347 | { | |
348 | if (!thread) { | |
349 | return -EINVAL; | |
350 | } | |
351 | return thread->state; | |
352 | } | |
353 | ||
354 | const char *lttng_health_thread_name(const struct lttng_health_thread *thread) | |
355 | { | |
356 | unsigned int nr; | |
357 | ||
358 | if (!thread) { | |
359 | return NULL; | |
360 | } | |
361 | nr = thread - &thread->p->thread[0]; | |
362 | return thread_name[thread->p->component][nr]; | |
363 | } |