Commit | Line | Data |
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f248b7d8 JD |
1 | #define _GNU_SOURCE /* See feature_test_macros(7) */ |
2 | #include <stdlib.h> | |
3 | #include <unistd.h> | |
4 | #include <sys/types.h> | |
5 | #include <stdio.h> | |
6 | #include <stdint.h> | |
7 | #include <inttypes.h> | |
8 | ||
9 | #define event_list "lttng_statedump_start,lttng_statedump_end," \ | |
10 | "lttng_statedump_process_state,lttng_statedump_file_descriptor," \ | |
11 | "lttng_statedump_vm_map,lttng_statedump_network_interface," \ | |
12 | "lttng_statedump_interrupt,sched_process_free," \ | |
13 | "sched_switch,sched_process_fork" | |
14 | #define context_list "-t pid -t procname -t tid -t ppid " | |
15 | ||
16 | static | |
17 | int check_or_start_sessiond() | |
18 | { | |
19 | int ret; | |
20 | int sudo = 0; | |
21 | ||
22 | ret = system("pgrep -u root lttng-sessiond >/dev/null"); | |
23 | if (ret == 0) | |
24 | goto end; | |
25 | ||
26 | if (getuid() != 0) { | |
27 | fprintf(stderr, "Trying to start lttng-sessiond with sudo\n"); | |
28 | ret = system("sudo -l lttng-sessiond >/dev/null"); | |
29 | if (ret < 0) { | |
30 | fprintf(stderr, "[error] You are not root and not " | |
31 | "allowed by sudo to start lttng-sessiond\n"); | |
32 | ret = -1; | |
33 | goto end; | |
34 | } | |
26d63ddf JD |
35 | ret = system("sudo -l lttng >/dev/null"); |
36 | if (ret < 0) { | |
37 | fprintf(stderr, "[error] You are not root and not " | |
38 | "allowed by sudo to use lttng\n"); | |
39 | ret = -1; | |
40 | goto end; | |
41 | } | |
f248b7d8 JD |
42 | sudo = 1; |
43 | } | |
44 | ||
45 | if (sudo) | |
46 | ret = system("sudo lttng-sessiond -d"); | |
47 | else | |
48 | ret = system("lttng-sessiond -d"); | |
49 | ||
50 | if (ret != 0) { | |
51 | fprintf(stderr, "Error starting lttng-sessiond as root\n"); | |
52 | ret = -1; | |
53 | goto end; | |
54 | } | |
55 | ||
56 | end: | |
57 | return ret; | |
58 | } | |
59 | ||
60 | static | |
61 | int check_or_start_relayd() | |
62 | { | |
63 | int ret; | |
64 | ||
65 | ret = system("pgrep lttng-relayd >/dev/null"); | |
66 | if (ret == 0) | |
67 | goto end; | |
68 | ||
69 | ret = system("lttng-relayd -d"); | |
70 | if (ret != 0) { | |
71 | fprintf(stderr, "Error starting lttng-relayd\n"); | |
72 | ret = -1; | |
73 | goto end; | |
74 | } | |
75 | ||
76 | end: | |
77 | return ret; | |
78 | } | |
79 | ||
80 | /* | |
81 | * Return 0 if in tracing group or root, 1 if sudo is needed (and working), | |
82 | * a negative value on error. | |
83 | */ | |
84 | static | |
85 | int check_tracing_group() | |
86 | { | |
87 | int ret; | |
88 | ||
89 | ret = getuid(); | |
90 | if (ret == 0) | |
91 | goto end; | |
92 | ||
93 | ret = system("groups|grep tracing >/dev/null"); | |
94 | if (ret == 0) { | |
95 | goto end; | |
96 | } | |
97 | ||
98 | ret = system("sudo lttng --version >/dev/null"); | |
99 | if (ret != 0) { | |
100 | fprintf(stderr, "Error executing lttng with sudo, you need to " | |
101 | "be root or in the \"tracing\" group to start " | |
102 | "kernel tracing\n"); | |
103 | ret = -1; | |
104 | goto end; | |
105 | } else { | |
106 | ret = 1; | |
107 | } | |
108 | ||
109 | end: | |
110 | return ret; | |
111 | } | |
112 | ||
113 | static | |
114 | int check_lttng_modules(int sudo) | |
115 | { | |
116 | int ret; | |
117 | ||
118 | if (sudo) { | |
119 | ret = system("sudo lttng list -k | grep sched_switch >/dev/null"); | |
120 | } else { | |
121 | ret = system("lttng list -k | grep sched_switch >/dev/null"); | |
122 | } | |
123 | if (ret != 0) { | |
124 | fprintf(stderr, "Error listing kernel events, " | |
125 | "lttng-modules might not be installed\n"); | |
126 | goto end; | |
127 | } | |
128 | ||
129 | end: | |
130 | return ret; | |
131 | } | |
132 | ||
133 | static | |
134 | int check_requirements(int *sudo) | |
135 | { | |
136 | int ret; | |
137 | ||
138 | ret = check_or_start_sessiond(); | |
139 | if (ret < 0) | |
140 | goto end; | |
141 | ret = check_or_start_relayd(); | |
142 | if (ret < 0) | |
143 | goto end; | |
144 | ret = check_tracing_group(); | |
145 | if (ret < 0) | |
146 | goto end; | |
147 | else if (ret == 1) | |
148 | *sudo = 1; | |
149 | ||
150 | ret = check_lttng_modules(*sudo); | |
151 | if (ret < 0) | |
152 | goto end; | |
153 | end: | |
154 | return ret; | |
155 | } | |
156 | ||
157 | /* | |
158 | * Allocate a random string, must be freed by the caller. | |
159 | */ | |
160 | static | |
161 | char *random_session_name() | |
162 | { | |
163 | uint64_t id; | |
164 | char *str = NULL; | |
165 | int ret; | |
166 | ||
167 | FILE *f = fopen( "/dev/urandom", "r"); | |
168 | if (!f) { | |
169 | perror("fopen"); | |
170 | goto end; | |
171 | } | |
172 | ||
173 | ret = fread(&id, 1, sizeof(uint64_t), f); | |
174 | if (ret < sizeof(id)) { | |
175 | perror("fread"); | |
176 | goto end; | |
177 | } | |
178 | ||
179 | ret = asprintf(&str, "lttngtop-%" PRIu64, id); | |
180 | if (ret < 0) { | |
181 | fprintf(stderr, "Error allocating session name"); | |
182 | str = NULL; | |
183 | goto end; | |
184 | } | |
185 | ||
186 | ret = fclose(f); | |
187 | if (ret != 0) { | |
188 | perror("fclose"); | |
189 | goto end; | |
190 | } | |
191 | ||
192 | end: | |
193 | return str; | |
194 | } | |
195 | ||
196 | static | |
197 | int check_session_name(char *name, int sudo) | |
198 | { | |
199 | int ret; | |
200 | char cmd[1024]; | |
201 | ||
202 | ret = sprintf(cmd, "%s lttng list | grep %s >/dev/null", | |
203 | (sudo) ? "sudo" : " ", name); | |
204 | if (ret < 0) { | |
205 | fprintf(stderr, "Allocating cmd\n"); | |
206 | goto end; | |
207 | } | |
208 | ||
209 | ret = (system(cmd)); | |
210 | if (ret == 0) { | |
211 | fprintf(stderr, "Error: session %s already exist, either we " | |
212 | "are not random enough or something is " | |
213 | "really wrong\n", name); | |
214 | ret = -1; | |
215 | goto end; | |
216 | } | |
217 | ||
218 | end: | |
219 | return ret; | |
220 | } | |
221 | ||
222 | static | |
223 | int local_session(char *name, int sudo) | |
224 | { | |
225 | int ret; | |
226 | char cmd[1024]; | |
227 | ||
228 | ret = sprintf(cmd, "%s lttng create %s >/dev/null", | |
229 | (sudo) ? "sudo" : " ", name); | |
230 | if (ret < 0) { | |
231 | fprintf(stderr, "Allocating cmd\n"); | |
232 | goto end; | |
233 | } | |
234 | ret = (system(cmd)); | |
235 | if (ret != 0) { | |
236 | fprintf(stderr, "Error: creating the session\n"); | |
237 | ret = -1; | |
238 | goto end; | |
239 | } | |
240 | ||
241 | end: | |
242 | return ret; | |
243 | } | |
244 | ||
245 | static | |
26d63ddf JD |
246 | int live_local_session(char *name, int sudo) |
247 | { | |
248 | int ret; | |
249 | char cmd[1024]; | |
250 | ||
251 | ret = sprintf(cmd, "%s lttng create %s --live 1000000 -U net://localhost >/dev/null", | |
252 | (sudo) ? "sudo" : " ", name); | |
253 | if (ret < 0) { | |
254 | fprintf(stderr, "Allocating cmd\n"); | |
255 | goto end; | |
256 | } | |
257 | ret = (system(cmd)); | |
258 | if (ret != 0) { | |
259 | fprintf(stderr, "Error: creating the session\n"); | |
260 | ret = -1; | |
261 | goto end; | |
262 | } | |
263 | ||
264 | end: | |
265 | return ret; | |
266 | } | |
267 | ||
268 | static | |
269 | int enable_events(char *name, int sudo) | |
f248b7d8 JD |
270 | { |
271 | int ret; | |
272 | char cmd[1024]; | |
273 | ||
274 | ret = sprintf(cmd, "%s lttng enable-event -s %s -k %s >/dev/null", | |
275 | (sudo) ? "sudo" : " ", name, event_list); | |
276 | if (ret < 0) { | |
277 | fprintf(stderr, "Allocating cmd\n"); | |
278 | goto end; | |
279 | } | |
280 | ||
281 | ret = (system(cmd)); | |
282 | if (ret != 0) { | |
283 | fprintf(stderr, "Error: enabling events\n"); | |
284 | ret = -1; | |
285 | goto end; | |
286 | } | |
287 | ||
288 | end: | |
289 | return ret; | |
290 | } | |
291 | ||
292 | static | |
293 | int add_contexts(char *name, int sudo) | |
294 | { | |
295 | int ret; | |
296 | char cmd[1024]; | |
297 | ||
298 | ret = sprintf(cmd, "%s lttng add-context -s %s -k %s >/dev/null", | |
299 | (sudo) ? "sudo" : " ", name, context_list); | |
300 | if (ret < 0) { | |
301 | fprintf(stderr, "allocating cmd\n"); | |
302 | goto end; | |
303 | } | |
304 | ||
305 | ret = (system(cmd)); | |
306 | if (ret != 0) { | |
307 | fprintf(stderr, "error: adding contexts\n"); | |
308 | ret = -1; | |
309 | goto end; | |
310 | } | |
311 | ||
312 | end: | |
313 | return ret; | |
314 | } | |
315 | ||
316 | static | |
26d63ddf | 317 | int start(char *name, int sudo, int local) |
f248b7d8 JD |
318 | { |
319 | int ret; | |
320 | char cmd[1024]; | |
321 | ||
322 | ret = sprintf(cmd, "%s lttng start %s >/dev/null", | |
323 | (sudo) ? "sudo" : " ", name); | |
324 | if (ret < 0) { | |
325 | fprintf(stderr, "allocating cmd\n"); | |
326 | goto end; | |
327 | } | |
328 | ||
329 | ret = (system(cmd)); | |
330 | if (ret != 0) { | |
331 | fprintf(stderr, "error: starting the session %s\n", name); | |
332 | ret = -1; | |
333 | goto end; | |
334 | } | |
335 | ||
26d63ddf JD |
336 | if (local) { |
337 | ret = sprintf(cmd, "%s lttng list|grep %s|cut -d'(' -f2|cut -d ')' -f1", | |
338 | (sudo) ? "sudo" : " ", name); | |
339 | } else { | |
340 | ret = sprintf(cmd, "lttngtop -r net://localhost|grep %s|cut -d' ' -f1", | |
341 | name); | |
342 | } | |
f248b7d8 JD |
343 | if (ret < 0) { |
344 | fprintf(stderr, "allocating cmd\n"); | |
345 | goto end; | |
346 | } | |
26d63ddf JD |
347 | fprintf(stderr, "%s session started : ", |
348 | (local) ? "Local" : "Live"); | |
f248b7d8 JD |
349 | ret = (system(cmd)); |
350 | if (ret != 0) { | |
351 | fprintf(stderr, "error: listing the sessions\n"); | |
352 | ret = -1; | |
353 | goto end; | |
354 | } | |
355 | ||
356 | end: | |
357 | return ret; | |
358 | } | |
359 | ||
360 | static | |
26d63ddf | 361 | int destroy(char *name) |
f248b7d8 JD |
362 | { |
363 | int ret; | |
26d63ddf | 364 | int sudo = 0; |
f248b7d8 JD |
365 | char cmd[1024]; |
366 | ||
26d63ddf JD |
367 | if (getuid() != 0) { |
368 | ret = system("sudo -l lttng >/dev/null"); | |
369 | if (ret < 0) { | |
370 | fprintf(stderr, "[error] You are not root and not " | |
371 | "allowed by sudo to use lttng\n"); | |
372 | ret = -1; | |
373 | goto end; | |
374 | } | |
375 | sudo = 1; | |
376 | } | |
377 | ||
f248b7d8 JD |
378 | ret = sprintf(cmd, "%s lttng destroy %s >/dev/null", |
379 | (sudo) ? "sudo" : " ", name); | |
380 | if (ret < 0) { | |
381 | fprintf(stderr, "allocating cmd\n"); | |
382 | goto end; | |
383 | } | |
384 | ||
385 | ret = (system(cmd)); | |
386 | if (ret != 0) { | |
387 | fprintf(stderr, "error: destroying the session %s\n", name); | |
388 | ret = -1; | |
389 | goto end; | |
390 | } | |
391 | ||
392 | end: | |
393 | return ret; | |
394 | } | |
395 | ||
396 | int create_local_session() | |
397 | { | |
398 | int ret; | |
399 | char *name; | |
400 | int sudo = 0; | |
401 | ||
402 | ret = check_requirements(&sudo); | |
403 | ||
404 | name = random_session_name(); | |
405 | if (!name) { | |
406 | ret = -1; | |
407 | goto end; | |
408 | } | |
409 | ||
410 | ret = check_session_name(name, sudo); | |
411 | if (ret < 0) { | |
412 | goto end_free; | |
413 | } | |
414 | ||
415 | ret = local_session(name, sudo); | |
416 | if (ret < 0) { | |
417 | goto end_free; | |
418 | } | |
419 | ||
26d63ddf | 420 | ret = enable_events(name, sudo); |
f248b7d8 JD |
421 | if (ret < 0) { |
422 | goto end_free; | |
423 | } | |
424 | ||
425 | ret = add_contexts(name, sudo); | |
426 | if (ret < 0) { | |
427 | goto end_free; | |
428 | } | |
429 | ||
26d63ddf | 430 | ret = start(name, sudo, 1); |
f248b7d8 JD |
431 | if (ret < 0) { |
432 | goto end_free; | |
433 | } | |
434 | ||
435 | end_free: | |
436 | free(name); | |
437 | end: | |
438 | return ret; | |
439 | } | |
440 | ||
26d63ddf JD |
441 | int destroy_session(char *name) |
442 | { | |
443 | return destroy(name); | |
444 | } | |
445 | ||
446 | int create_live_local_session() | |
f248b7d8 | 447 | { |
26d63ddf JD |
448 | int ret; |
449 | char *name; | |
450 | int sudo = 0; | |
451 | ||
452 | ret = check_requirements(&sudo); | |
453 | ||
454 | name = random_session_name(); | |
455 | if (!name) { | |
456 | ret = -1; | |
457 | goto end; | |
458 | } | |
459 | ||
460 | ret = check_session_name(name, sudo); | |
461 | if (ret < 0) { | |
462 | goto end_free; | |
463 | } | |
464 | ||
465 | ret = live_local_session(name, sudo); | |
466 | if (ret < 0) { | |
467 | goto end_free; | |
468 | } | |
469 | ||
470 | ret = enable_events(name, sudo); | |
471 | if (ret < 0) { | |
472 | goto end_free; | |
473 | } | |
474 | ||
475 | ret = add_contexts(name, sudo); | |
476 | if (ret < 0) { | |
477 | goto end_free; | |
478 | } | |
479 | ||
480 | ret = start(name, sudo, 0); | |
481 | if (ret < 0) { | |
482 | goto end_free; | |
483 | } | |
484 | ||
485 | end_free: | |
486 | free(name); | |
487 | end: | |
488 | return ret; | |
f248b7d8 JD |
489 | } |
490 | ||
491 | /* | |
492 | int create_live_local_session(); | |
493 | int destroy_live_local_session(); | |
494 | */ |