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> | |
6a1b139c | 8 | #include <string.h> |
f248b7d8 JD |
9 | |
10 | #define event_list "lttng_statedump_start,lttng_statedump_end," \ | |
11 | "lttng_statedump_process_state,lttng_statedump_file_descriptor," \ | |
12 | "lttng_statedump_vm_map,lttng_statedump_network_interface," \ | |
13 | "lttng_statedump_interrupt,sched_process_free," \ | |
14 | "sched_switch,sched_process_fork" | |
15 | #define context_list "-t pid -t procname -t tid -t ppid " | |
16 | ||
17 | static | |
18 | int check_or_start_sessiond() | |
19 | { | |
20 | int ret; | |
21 | int sudo = 0; | |
22 | ||
23 | ret = system("pgrep -u root lttng-sessiond >/dev/null"); | |
24 | if (ret == 0) | |
25 | goto end; | |
26 | ||
27 | if (getuid() != 0) { | |
28 | fprintf(stderr, "Trying to start lttng-sessiond with sudo\n"); | |
29 | ret = system("sudo -l lttng-sessiond >/dev/null"); | |
30 | if (ret < 0) { | |
31 | fprintf(stderr, "[error] You are not root and not " | |
32 | "allowed by sudo to start lttng-sessiond\n"); | |
33 | ret = -1; | |
34 | goto end; | |
35 | } | |
26d63ddf JD |
36 | ret = system("sudo -l lttng >/dev/null"); |
37 | if (ret < 0) { | |
38 | fprintf(stderr, "[error] You are not root and not " | |
39 | "allowed by sudo to use lttng\n"); | |
40 | ret = -1; | |
41 | goto end; | |
42 | } | |
f248b7d8 JD |
43 | sudo = 1; |
44 | } | |
45 | ||
46 | if (sudo) | |
47 | ret = system("sudo lttng-sessiond -d"); | |
48 | else | |
49 | ret = system("lttng-sessiond -d"); | |
50 | ||
51 | if (ret != 0) { | |
52 | fprintf(stderr, "Error starting lttng-sessiond as root\n"); | |
53 | ret = -1; | |
54 | goto end; | |
55 | } | |
56 | ||
57 | end: | |
58 | return ret; | |
59 | } | |
60 | ||
61 | static | |
62 | int check_or_start_relayd() | |
63 | { | |
64 | int ret; | |
65 | ||
66 | ret = system("pgrep lttng-relayd >/dev/null"); | |
67 | if (ret == 0) | |
68 | goto end; | |
69 | ||
70 | ret = system("lttng-relayd -d"); | |
71 | if (ret != 0) { | |
72 | fprintf(stderr, "Error starting lttng-relayd\n"); | |
73 | ret = -1; | |
74 | goto end; | |
75 | } | |
76 | ||
77 | end: | |
78 | return ret; | |
79 | } | |
80 | ||
81 | /* | |
82 | * Return 0 if in tracing group or root, 1 if sudo is needed (and working), | |
83 | * a negative value on error. | |
84 | */ | |
85 | static | |
86 | int check_tracing_group() | |
87 | { | |
88 | int ret; | |
89 | ||
90 | ret = getuid(); | |
91 | if (ret == 0) | |
92 | goto end; | |
93 | ||
94 | ret = system("groups|grep tracing >/dev/null"); | |
95 | if (ret == 0) { | |
96 | goto end; | |
97 | } | |
98 | ||
99 | ret = system("sudo lttng --version >/dev/null"); | |
100 | if (ret != 0) { | |
101 | fprintf(stderr, "Error executing lttng with sudo, you need to " | |
102 | "be root or in the \"tracing\" group to start " | |
103 | "kernel tracing\n"); | |
104 | ret = -1; | |
105 | goto end; | |
106 | } else { | |
107 | ret = 1; | |
108 | } | |
109 | ||
110 | end: | |
111 | return ret; | |
112 | } | |
113 | ||
114 | static | |
115 | int check_lttng_modules(int sudo) | |
116 | { | |
117 | int ret; | |
118 | ||
119 | if (sudo) { | |
120 | ret = system("sudo lttng list -k | grep sched_switch >/dev/null"); | |
121 | } else { | |
122 | ret = system("lttng list -k | grep sched_switch >/dev/null"); | |
123 | } | |
124 | if (ret != 0) { | |
125 | fprintf(stderr, "Error listing kernel events, " | |
126 | "lttng-modules might not be installed\n"); | |
127 | goto end; | |
128 | } | |
129 | ||
130 | end: | |
131 | return ret; | |
132 | } | |
133 | ||
134 | static | |
135 | int check_requirements(int *sudo) | |
136 | { | |
137 | int ret; | |
138 | ||
139 | ret = check_or_start_sessiond(); | |
140 | if (ret < 0) | |
141 | goto end; | |
142 | ret = check_or_start_relayd(); | |
143 | if (ret < 0) | |
144 | goto end; | |
145 | ret = check_tracing_group(); | |
146 | if (ret < 0) | |
147 | goto end; | |
148 | else if (ret == 1) | |
149 | *sudo = 1; | |
150 | ||
151 | ret = check_lttng_modules(*sudo); | |
152 | if (ret < 0) | |
153 | goto end; | |
154 | end: | |
155 | return ret; | |
156 | } | |
157 | ||
158 | /* | |
159 | * Allocate a random string, must be freed by the caller. | |
160 | */ | |
161 | static | |
162 | char *random_session_name() | |
163 | { | |
164 | uint64_t id; | |
165 | char *str = NULL; | |
166 | int ret; | |
167 | ||
168 | FILE *f = fopen( "/dev/urandom", "r"); | |
169 | if (!f) { | |
170 | perror("fopen"); | |
171 | goto end; | |
172 | } | |
173 | ||
174 | ret = fread(&id, 1, sizeof(uint64_t), f); | |
175 | if (ret < sizeof(id)) { | |
176 | perror("fread"); | |
177 | goto end; | |
178 | } | |
179 | ||
180 | ret = asprintf(&str, "lttngtop-%" PRIu64, id); | |
181 | if (ret < 0) { | |
182 | fprintf(stderr, "Error allocating session name"); | |
183 | str = NULL; | |
184 | goto end; | |
185 | } | |
186 | ||
187 | ret = fclose(f); | |
188 | if (ret != 0) { | |
189 | perror("fclose"); | |
190 | goto end; | |
191 | } | |
192 | ||
193 | end: | |
194 | return str; | |
195 | } | |
196 | ||
197 | static | |
198 | int check_session_name(char *name, int sudo) | |
199 | { | |
200 | int ret; | |
201 | char cmd[1024]; | |
202 | ||
203 | ret = sprintf(cmd, "%s lttng list | grep %s >/dev/null", | |
204 | (sudo) ? "sudo" : " ", name); | |
205 | if (ret < 0) { | |
206 | fprintf(stderr, "Allocating cmd\n"); | |
207 | goto end; | |
208 | } | |
209 | ||
210 | ret = (system(cmd)); | |
211 | if (ret == 0) { | |
212 | fprintf(stderr, "Error: session %s already exist, either we " | |
213 | "are not random enough or something is " | |
214 | "really wrong\n", name); | |
215 | ret = -1; | |
216 | goto end; | |
217 | } | |
218 | ||
219 | end: | |
220 | return ret; | |
221 | } | |
222 | ||
223 | static | |
224 | int local_session(char *name, int sudo) | |
225 | { | |
226 | int ret; | |
227 | char cmd[1024]; | |
228 | ||
229 | ret = sprintf(cmd, "%s lttng create %s >/dev/null", | |
230 | (sudo) ? "sudo" : " ", name); | |
231 | if (ret < 0) { | |
232 | fprintf(stderr, "Allocating cmd\n"); | |
233 | goto end; | |
234 | } | |
235 | ret = (system(cmd)); | |
236 | if (ret != 0) { | |
237 | fprintf(stderr, "Error: creating the session\n"); | |
238 | ret = -1; | |
239 | goto end; | |
240 | } | |
241 | ||
242 | end: | |
243 | return ret; | |
244 | } | |
245 | ||
246 | static | |
26d63ddf JD |
247 | int live_local_session(char *name, int sudo) |
248 | { | |
249 | int ret; | |
250 | char cmd[1024]; | |
251 | ||
252 | ret = sprintf(cmd, "%s lttng create %s --live 1000000 -U net://localhost >/dev/null", | |
253 | (sudo) ? "sudo" : " ", name); | |
254 | if (ret < 0) { | |
255 | fprintf(stderr, "Allocating cmd\n"); | |
256 | goto end; | |
257 | } | |
258 | ret = (system(cmd)); | |
259 | if (ret != 0) { | |
260 | fprintf(stderr, "Error: creating the session\n"); | |
261 | ret = -1; | |
262 | goto end; | |
263 | } | |
264 | ||
265 | end: | |
266 | return ret; | |
267 | } | |
268 | ||
269 | static | |
270 | int enable_events(char *name, int sudo) | |
f248b7d8 JD |
271 | { |
272 | int ret; | |
273 | char cmd[1024]; | |
274 | ||
58b6d0bf JD |
275 | ret = sprintf(cmd, "%s lttng enable-event -s %s -k %s >/dev/null;" |
276 | "lttng enable-event -k --syscall -a -s %s >/dev/null", | |
277 | (sudo) ? "sudo" : " ", name, event_list, name); | |
f248b7d8 JD |
278 | if (ret < 0) { |
279 | fprintf(stderr, "Allocating cmd\n"); | |
280 | goto end; | |
281 | } | |
282 | ||
283 | ret = (system(cmd)); | |
284 | if (ret != 0) { | |
285 | fprintf(stderr, "Error: enabling events\n"); | |
286 | ret = -1; | |
287 | goto end; | |
288 | } | |
289 | ||
290 | end: | |
291 | return ret; | |
292 | } | |
293 | ||
294 | static | |
295 | int add_contexts(char *name, int sudo) | |
296 | { | |
297 | int ret; | |
298 | char cmd[1024]; | |
299 | ||
300 | ret = sprintf(cmd, "%s lttng add-context -s %s -k %s >/dev/null", | |
301 | (sudo) ? "sudo" : " ", name, context_list); | |
302 | if (ret < 0) { | |
303 | fprintf(stderr, "allocating cmd\n"); | |
304 | goto end; | |
305 | } | |
306 | ||
307 | ret = (system(cmd)); | |
308 | if (ret != 0) { | |
309 | fprintf(stderr, "error: adding contexts\n"); | |
310 | ret = -1; | |
311 | goto end; | |
312 | } | |
313 | ||
314 | end: | |
315 | return ret; | |
316 | } | |
317 | ||
318 | static | |
6a1b139c | 319 | int start(char *name, int sudo, int local, int print) |
f248b7d8 JD |
320 | { |
321 | int ret; | |
322 | char cmd[1024]; | |
323 | ||
324 | ret = sprintf(cmd, "%s lttng start %s >/dev/null", | |
325 | (sudo) ? "sudo" : " ", name); | |
326 | if (ret < 0) { | |
327 | fprintf(stderr, "allocating cmd\n"); | |
328 | goto end; | |
329 | } | |
330 | ||
331 | ret = (system(cmd)); | |
332 | if (ret != 0) { | |
333 | fprintf(stderr, "error: starting the session %s\n", name); | |
334 | ret = -1; | |
335 | goto end; | |
336 | } | |
337 | ||
6a1b139c JD |
338 | if (!print) |
339 | goto end; | |
340 | ||
26d63ddf JD |
341 | if (local) { |
342 | ret = sprintf(cmd, "%s lttng list|grep %s|cut -d'(' -f2|cut -d ')' -f1", | |
343 | (sudo) ? "sudo" : " ", name); | |
344 | } else { | |
6a1b139c | 345 | ret = sprintf(cmd, "babeltrace -i lttng-live net://localhost|grep %s|cut -d' ' -f1", |
26d63ddf JD |
346 | name); |
347 | } | |
f248b7d8 JD |
348 | if (ret < 0) { |
349 | fprintf(stderr, "allocating cmd\n"); | |
350 | goto end; | |
351 | } | |
26d63ddf JD |
352 | fprintf(stderr, "%s session started : ", |
353 | (local) ? "Local" : "Live"); | |
f248b7d8 JD |
354 | ret = (system(cmd)); |
355 | if (ret != 0) { | |
356 | fprintf(stderr, "error: listing the sessions\n"); | |
357 | ret = -1; | |
358 | goto end; | |
359 | } | |
360 | ||
361 | end: | |
362 | return ret; | |
363 | } | |
364 | ||
6a1b139c JD |
365 | static |
366 | char *live_path(char *name) | |
367 | { | |
368 | FILE *fp; | |
369 | int ret; | |
370 | char path[1035]; | |
371 | char cmd[1024]; | |
372 | char *out = NULL; | |
373 | ||
374 | ret = sprintf(cmd, "lttngtop -r net://localhost|grep %s|cut -d' ' -f1", | |
375 | name); | |
376 | if (ret < 0) { | |
377 | fprintf(stderr, "allocating cmd\n"); | |
378 | goto end; | |
379 | } | |
380 | ||
381 | fp = popen(cmd, "r"); | |
382 | if (fp == NULL) { | |
383 | printf("Failed to run command\n" ); | |
384 | goto end; | |
385 | } | |
386 | ||
387 | /* Read the output a line at a time - output it. */ | |
388 | out = fgets(path, sizeof(path)-1, fp); | |
389 | if (out) | |
390 | out = strdup(path); | |
391 | ||
392 | /* close */ | |
393 | pclose(fp); | |
394 | ||
395 | end: | |
396 | return out; | |
397 | } | |
398 | ||
f248b7d8 | 399 | static |
26d63ddf | 400 | int destroy(char *name) |
f248b7d8 JD |
401 | { |
402 | int ret; | |
26d63ddf | 403 | int sudo = 0; |
f248b7d8 JD |
404 | char cmd[1024]; |
405 | ||
415f00b6 JD |
406 | ret = system("groups|grep tracing >/dev/null"); |
407 | if (ret != 0 && getuid() != 0) { | |
26d63ddf JD |
408 | ret = system("sudo -l lttng >/dev/null"); |
409 | if (ret < 0) { | |
410 | fprintf(stderr, "[error] You are not root and not " | |
411 | "allowed by sudo to use lttng\n"); | |
412 | ret = -1; | |
413 | goto end; | |
414 | } | |
415 | sudo = 1; | |
416 | } | |
417 | ||
f248b7d8 JD |
418 | ret = sprintf(cmd, "%s lttng destroy %s >/dev/null", |
419 | (sudo) ? "sudo" : " ", name); | |
420 | if (ret < 0) { | |
421 | fprintf(stderr, "allocating cmd\n"); | |
422 | goto end; | |
423 | } | |
424 | ||
425 | ret = (system(cmd)); | |
426 | if (ret != 0) { | |
427 | fprintf(stderr, "error: destroying the session %s\n", name); | |
428 | ret = -1; | |
429 | goto end; | |
430 | } | |
431 | ||
432 | end: | |
433 | return ret; | |
434 | } | |
435 | ||
436 | int create_local_session() | |
437 | { | |
438 | int ret; | |
439 | char *name; | |
440 | int sudo = 0; | |
441 | ||
442 | ret = check_requirements(&sudo); | |
443 | ||
444 | name = random_session_name(); | |
445 | if (!name) { | |
446 | ret = -1; | |
447 | goto end; | |
448 | } | |
449 | ||
450 | ret = check_session_name(name, sudo); | |
451 | if (ret < 0) { | |
452 | goto end_free; | |
453 | } | |
454 | ||
455 | ret = local_session(name, sudo); | |
456 | if (ret < 0) { | |
457 | goto end_free; | |
458 | } | |
459 | ||
26d63ddf | 460 | ret = enable_events(name, sudo); |
f248b7d8 JD |
461 | if (ret < 0) { |
462 | goto end_free; | |
463 | } | |
464 | ||
465 | ret = add_contexts(name, sudo); | |
466 | if (ret < 0) { | |
467 | goto end_free; | |
468 | } | |
469 | ||
6a1b139c | 470 | ret = start(name, sudo, 1, 1); |
f248b7d8 JD |
471 | if (ret < 0) { |
472 | goto end_free; | |
473 | } | |
474 | ||
475 | end_free: | |
476 | free(name); | |
477 | end: | |
478 | return ret; | |
479 | } | |
480 | ||
6a1b139c | 481 | int destroy_live_local_session(char *name) |
26d63ddf JD |
482 | { |
483 | return destroy(name); | |
484 | } | |
485 | ||
6a1b139c | 486 | int create_live_local_session(char **session_path, char **session_name, int print) |
f248b7d8 | 487 | { |
26d63ddf JD |
488 | int ret; |
489 | char *name; | |
490 | int sudo = 0; | |
491 | ||
492 | ret = check_requirements(&sudo); | |
493 | ||
494 | name = random_session_name(); | |
495 | if (!name) { | |
496 | ret = -1; | |
497 | goto end; | |
498 | } | |
499 | ||
500 | ret = check_session_name(name, sudo); | |
501 | if (ret < 0) { | |
502 | goto end_free; | |
503 | } | |
504 | ||
505 | ret = live_local_session(name, sudo); | |
506 | if (ret < 0) { | |
507 | goto end_free; | |
508 | } | |
509 | ||
510 | ret = enable_events(name, sudo); | |
511 | if (ret < 0) { | |
512 | goto end_free; | |
513 | } | |
514 | ||
515 | ret = add_contexts(name, sudo); | |
516 | if (ret < 0) { | |
517 | goto end_free; | |
518 | } | |
519 | ||
6a1b139c | 520 | ret = start(name, sudo, 0, print); |
26d63ddf JD |
521 | if (ret < 0) { |
522 | goto end_free; | |
523 | } | |
524 | ||
6a1b139c JD |
525 | if (session_path) |
526 | *session_path = live_path(name); | |
527 | if (session_name) { | |
528 | *session_name = name; | |
529 | goto end; | |
530 | } | |
531 | ||
26d63ddf JD |
532 | end_free: |
533 | free(name); | |
534 | end: | |
535 | return ret; | |
f248b7d8 | 536 | } |