Commit | Line | Data |
---|---|---|
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 | ||
275 | ret = sprintf(cmd, "%s lttng enable-event -s %s -k %s >/dev/null", | |
276 | (sudo) ? "sudo" : " ", name, event_list); | |
277 | if (ret < 0) { | |
278 | fprintf(stderr, "Allocating cmd\n"); | |
279 | goto end; | |
280 | } | |
281 | ||
282 | ret = (system(cmd)); | |
283 | if (ret != 0) { | |
284 | fprintf(stderr, "Error: enabling events\n"); | |
285 | ret = -1; | |
286 | goto end; | |
287 | } | |
288 | ||
289 | end: | |
290 | return ret; | |
291 | } | |
292 | ||
293 | static | |
294 | int add_contexts(char *name, int sudo) | |
295 | { | |
296 | int ret; | |
297 | char cmd[1024]; | |
298 | ||
299 | ret = sprintf(cmd, "%s lttng add-context -s %s -k %s >/dev/null", | |
300 | (sudo) ? "sudo" : " ", name, context_list); | |
301 | if (ret < 0) { | |
302 | fprintf(stderr, "allocating cmd\n"); | |
303 | goto end; | |
304 | } | |
305 | ||
306 | ret = (system(cmd)); | |
307 | if (ret != 0) { | |
308 | fprintf(stderr, "error: adding contexts\n"); | |
309 | ret = -1; | |
310 | goto end; | |
311 | } | |
312 | ||
313 | end: | |
314 | return ret; | |
315 | } | |
316 | ||
317 | static | |
6a1b139c | 318 | int start(char *name, int sudo, int local, int print) |
f248b7d8 JD |
319 | { |
320 | int ret; | |
321 | char cmd[1024]; | |
322 | ||
323 | ret = sprintf(cmd, "%s lttng start %s >/dev/null", | |
324 | (sudo) ? "sudo" : " ", name); | |
325 | if (ret < 0) { | |
326 | fprintf(stderr, "allocating cmd\n"); | |
327 | goto end; | |
328 | } | |
329 | ||
330 | ret = (system(cmd)); | |
331 | if (ret != 0) { | |
332 | fprintf(stderr, "error: starting the session %s\n", name); | |
333 | ret = -1; | |
334 | goto end; | |
335 | } | |
336 | ||
6a1b139c JD |
337 | if (!print) |
338 | goto end; | |
339 | ||
26d63ddf JD |
340 | if (local) { |
341 | ret = sprintf(cmd, "%s lttng list|grep %s|cut -d'(' -f2|cut -d ')' -f1", | |
342 | (sudo) ? "sudo" : " ", name); | |
343 | } else { | |
6a1b139c | 344 | ret = sprintf(cmd, "babeltrace -i lttng-live net://localhost|grep %s|cut -d' ' -f1", |
26d63ddf JD |
345 | name); |
346 | } | |
f248b7d8 JD |
347 | if (ret < 0) { |
348 | fprintf(stderr, "allocating cmd\n"); | |
349 | goto end; | |
350 | } | |
26d63ddf JD |
351 | fprintf(stderr, "%s session started : ", |
352 | (local) ? "Local" : "Live"); | |
f248b7d8 JD |
353 | ret = (system(cmd)); |
354 | if (ret != 0) { | |
355 | fprintf(stderr, "error: listing the sessions\n"); | |
356 | ret = -1; | |
357 | goto end; | |
358 | } | |
359 | ||
360 | end: | |
361 | return ret; | |
362 | } | |
363 | ||
6a1b139c JD |
364 | static |
365 | char *live_path(char *name) | |
366 | { | |
367 | FILE *fp; | |
368 | int ret; | |
369 | char path[1035]; | |
370 | char cmd[1024]; | |
371 | char *out = NULL; | |
372 | ||
373 | ret = sprintf(cmd, "lttngtop -r net://localhost|grep %s|cut -d' ' -f1", | |
374 | name); | |
375 | if (ret < 0) { | |
376 | fprintf(stderr, "allocating cmd\n"); | |
377 | goto end; | |
378 | } | |
379 | ||
380 | fp = popen(cmd, "r"); | |
381 | if (fp == NULL) { | |
382 | printf("Failed to run command\n" ); | |
383 | goto end; | |
384 | } | |
385 | ||
386 | /* Read the output a line at a time - output it. */ | |
387 | out = fgets(path, sizeof(path)-1, fp); | |
388 | if (out) | |
389 | out = strdup(path); | |
390 | ||
391 | /* close */ | |
392 | pclose(fp); | |
393 | ||
394 | end: | |
395 | return out; | |
396 | } | |
397 | ||
f248b7d8 | 398 | static |
26d63ddf | 399 | int destroy(char *name) |
f248b7d8 JD |
400 | { |
401 | int ret; | |
26d63ddf | 402 | int sudo = 0; |
f248b7d8 JD |
403 | char cmd[1024]; |
404 | ||
415f00b6 JD |
405 | ret = system("groups|grep tracing >/dev/null"); |
406 | if (ret != 0 && getuid() != 0) { | |
26d63ddf JD |
407 | ret = system("sudo -l lttng >/dev/null"); |
408 | if (ret < 0) { | |
409 | fprintf(stderr, "[error] You are not root and not " | |
410 | "allowed by sudo to use lttng\n"); | |
411 | ret = -1; | |
412 | goto end; | |
413 | } | |
414 | sudo = 1; | |
415 | } | |
416 | ||
f248b7d8 JD |
417 | ret = sprintf(cmd, "%s lttng destroy %s >/dev/null", |
418 | (sudo) ? "sudo" : " ", name); | |
419 | if (ret < 0) { | |
420 | fprintf(stderr, "allocating cmd\n"); | |
421 | goto end; | |
422 | } | |
423 | ||
424 | ret = (system(cmd)); | |
425 | if (ret != 0) { | |
426 | fprintf(stderr, "error: destroying the session %s\n", name); | |
427 | ret = -1; | |
428 | goto end; | |
429 | } | |
430 | ||
431 | end: | |
432 | return ret; | |
433 | } | |
434 | ||
435 | int create_local_session() | |
436 | { | |
437 | int ret; | |
438 | char *name; | |
439 | int sudo = 0; | |
440 | ||
441 | ret = check_requirements(&sudo); | |
442 | ||
443 | name = random_session_name(); | |
444 | if (!name) { | |
445 | ret = -1; | |
446 | goto end; | |
447 | } | |
448 | ||
449 | ret = check_session_name(name, sudo); | |
450 | if (ret < 0) { | |
451 | goto end_free; | |
452 | } | |
453 | ||
454 | ret = local_session(name, sudo); | |
455 | if (ret < 0) { | |
456 | goto end_free; | |
457 | } | |
458 | ||
26d63ddf | 459 | ret = enable_events(name, sudo); |
f248b7d8 JD |
460 | if (ret < 0) { |
461 | goto end_free; | |
462 | } | |
463 | ||
464 | ret = add_contexts(name, sudo); | |
465 | if (ret < 0) { | |
466 | goto end_free; | |
467 | } | |
468 | ||
6a1b139c | 469 | ret = start(name, sudo, 1, 1); |
f248b7d8 JD |
470 | if (ret < 0) { |
471 | goto end_free; | |
472 | } | |
473 | ||
474 | end_free: | |
475 | free(name); | |
476 | end: | |
477 | return ret; | |
478 | } | |
479 | ||
6a1b139c | 480 | int destroy_live_local_session(char *name) |
26d63ddf JD |
481 | { |
482 | return destroy(name); | |
483 | } | |
484 | ||
6a1b139c | 485 | int create_live_local_session(char **session_path, char **session_name, int print) |
f248b7d8 | 486 | { |
26d63ddf JD |
487 | int ret; |
488 | char *name; | |
489 | int sudo = 0; | |
490 | ||
491 | ret = check_requirements(&sudo); | |
492 | ||
493 | name = random_session_name(); | |
494 | if (!name) { | |
495 | ret = -1; | |
496 | goto end; | |
497 | } | |
498 | ||
499 | ret = check_session_name(name, sudo); | |
500 | if (ret < 0) { | |
501 | goto end_free; | |
502 | } | |
503 | ||
504 | ret = live_local_session(name, sudo); | |
505 | if (ret < 0) { | |
506 | goto end_free; | |
507 | } | |
508 | ||
509 | ret = enable_events(name, sudo); | |
510 | if (ret < 0) { | |
511 | goto end_free; | |
512 | } | |
513 | ||
514 | ret = add_contexts(name, sudo); | |
515 | if (ret < 0) { | |
516 | goto end_free; | |
517 | } | |
518 | ||
6a1b139c | 519 | ret = start(name, sudo, 0, print); |
26d63ddf JD |
520 | if (ret < 0) { |
521 | goto end_free; | |
522 | } | |
523 | ||
6a1b139c JD |
524 | if (session_path) |
525 | *session_path = live_path(name); | |
526 | if (session_name) { | |
527 | *session_name = name; | |
528 | goto end; | |
529 | } | |
530 | ||
26d63ddf JD |
531 | end_free: |
532 | free(name); | |
533 | end: | |
534 | return ret; | |
f248b7d8 | 535 | } |