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Commit | Line | Data |
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72d0e1cb SG |
1 | /* liblxcapi |
2 | * | |
3 | * Copyright © 2012 Serge Hallyn <serge.hallyn@ubuntu.com>. | |
4 | * Copyright © 2012 Canonical Ltd. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2, as | |
8 | * published by the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License along | |
16 | * with this program; if not, write to the Free Software Foundation, Inc., | |
17 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 | */ | |
19 | ||
9be53773 | 20 | #define _GNU_SOURCE |
71454076 | 21 | #include <pthread.h> |
9be53773 SH |
22 | #include <unistd.h> |
23 | #include <sys/types.h> | |
24 | #include <sys/wait.h> | |
25 | #include <errno.h> | |
93dc5327 | 26 | #include <fcntl.h> |
9be53773 SH |
27 | #include <sched.h> |
28 | #include "config.h" | |
72d0e1cb SG |
29 | #include "lxc.h" |
30 | #include "state.h" | |
31 | #include "lxccontainer.h" | |
32 | #include "conf.h" | |
72d0e1cb | 33 | #include "confile.h" |
b5159817 | 34 | #include "console.h" |
72d0e1cb SG |
35 | #include "cgroup.h" |
36 | #include "commands.h" | |
b6b918a1 | 37 | #include "version.h" |
72d0e1cb | 38 | #include "log.h" |
9be53773 | 39 | #include "bdev.h" |
6a44839f | 40 | #include "utils.h" |
2a59a681 | 41 | #include <lxc/utils.h> |
e51d4895 | 42 | #include <lxc/monitor.h> |
9c83a661 | 43 | #include <sched.h> |
9c83a661 SG |
44 | #include <arpa/inet.h> |
45 | #include <ifaddrs.h> | |
72d0e1cb SG |
46 | |
47 | lxc_log_define(lxc_container, lxc); | |
48 | ||
3e625e2d SH |
49 | static bool file_exists(char *f) |
50 | { | |
51 | struct stat statbuf; | |
52 | ||
53 | return stat(f, &statbuf) == 0; | |
54 | } | |
55 | ||
56 | /* | |
57 | * A few functions to help detect when a container creation failed. | |
58 | * If a container creation was killed partway through, then trying | |
59 | * to actually start that container could harm the host. We detect | |
60 | * this by creating a 'partial' file under the container directory, | |
61 | * and keeping an advisory lock. When container creation completes, | |
62 | * we remove that file. When we load or try to start a container, if | |
63 | * we find that file, without a flock, we remove the container. | |
64 | */ | |
65 | int ongoing_create(struct lxc_container *c) | |
66 | { | |
67 | int len = strlen(c->config_path) + strlen(c->name) + 10; | |
68 | char *path = alloca(len); | |
69 | int fd, ret; | |
93dc5327 SH |
70 | struct flock lk; |
71 | ||
3e625e2d SH |
72 | ret = snprintf(path, len, "%s/%s/partial", c->config_path, c->name); |
73 | if (ret < 0 || ret >= len) { | |
74 | ERROR("Error writing partial pathname"); | |
75 | return -1; | |
76 | } | |
77 | ||
78 | if (!file_exists(path)) | |
79 | return 0; | |
80 | if (process_lock()) | |
81 | return -1; | |
82 | if ((fd = open(path, O_RDWR)) < 0) { | |
83 | // give benefit of the doubt | |
84 | SYSERROR("Error opening partial file"); | |
85 | process_unlock(); | |
86 | return 0; | |
87 | } | |
93dc5327 SH |
88 | lk.l_type = F_WRLCK; |
89 | lk.l_whence = SEEK_SET; | |
90 | lk.l_start = 0; | |
91 | lk.l_len = 0; | |
92 | lk.l_pid = -1; | |
93 | if (fcntl(fd, F_GETLK, &lk) == 0 && lk.l_pid != -1) { | |
3e625e2d SH |
94 | // create is still ongoing |
95 | close(fd); | |
96 | process_unlock(); | |
97 | return 1; | |
98 | } | |
99 | // create completed but partial is still there. | |
100 | close(fd); | |
101 | process_unlock(); | |
102 | return 2; | |
103 | } | |
104 | ||
105 | int create_partial(struct lxc_container *c) | |
106 | { | |
107 | // $lxcpath + '/' + $name + '/partial' + \0 | |
108 | int len = strlen(c->config_path) + strlen(c->name) + 10; | |
109 | char *path = alloca(len); | |
110 | int fd, ret; | |
93dc5327 SH |
111 | struct flock lk; |
112 | ||
3e625e2d SH |
113 | ret = snprintf(path, len, "%s/%s/partial", c->config_path, c->name); |
114 | if (ret < 0 || ret >= len) { | |
115 | ERROR("Error writing partial pathname"); | |
116 | return -1; | |
117 | } | |
1897e3bc | 118 | if (process_lock()) |
3e625e2d | 119 | return -1; |
93dc5327 | 120 | if ((fd=open(path, O_RDWR | O_CREAT | O_EXCL, 0755)) < 0) { |
3e625e2d SH |
121 | SYSERROR("Erorr creating partial file"); |
122 | process_unlock(); | |
123 | return -1; | |
124 | } | |
93dc5327 SH |
125 | lk.l_type = F_WRLCK; |
126 | lk.l_whence = SEEK_SET; | |
127 | lk.l_start = 0; | |
128 | lk.l_len = 0; | |
129 | if (fcntl(fd, F_SETLKW, &lk) < 0) { | |
3e625e2d SH |
130 | SYSERROR("Error locking partial file %s", path); |
131 | close(fd); | |
132 | process_unlock(); | |
133 | return -1; | |
134 | } | |
135 | process_unlock(); | |
136 | ||
137 | return fd; | |
138 | } | |
139 | ||
140 | void remove_partial(struct lxc_container *c, int fd) | |
141 | { | |
142 | // $lxcpath + '/' + $name + '/partial' + \0 | |
143 | int len = strlen(c->config_path) + strlen(c->name) + 10; | |
144 | char *path = alloca(len); | |
145 | int ret; | |
146 | ||
147 | close(fd); | |
148 | ret = snprintf(path, len, "%s/%s/partial", c->config_path, c->name); | |
149 | if (ret < 0 || ret >= len) { | |
150 | ERROR("Error writing partial pathname"); | |
151 | return; | |
152 | } | |
153 | if (process_lock()) | |
154 | return; | |
155 | if (unlink(path) < 0) | |
156 | SYSERROR("Error unlink partial file %s", path); | |
157 | process_unlock(); | |
158 | } | |
159 | ||
72d0e1cb | 160 | /* LOCKING |
3bc449ed SH |
161 | * 1. container_mem_lock(c) protects the struct lxc_container from multiple threads. |
162 | * 2. container_disk_lock(c) protects the on-disk container data - in particular the | |
163 | * container configuration file. | |
164 | * The container_disk_lock also takes the container_mem_lock. | |
165 | * 3. thread_mutex protects process data (ex: fd table) from multiple threads. | |
72d0e1cb SG |
166 | * NOTHING mutexes two independent programs with their own struct |
167 | * lxc_container for the same c->name, between API calls. For instance, | |
168 | * c->config_read(); c->start(); Between those calls, data on disk | |
169 | * could change (which shouldn't bother the caller unless for instance | |
170 | * the rootfs get moved). c->config_read(); update; c->config_write(); | |
171 | * Two such updaters could race. The callers should therefore check their | |
172 | * results. Trying to prevent that would necessarily expose us to deadlocks | |
173 | * due to hung callers. So I prefer to keep the locks only within our own | |
174 | * functions, not across functions. | |
175 | * | |
3bc449ed | 176 | * If you're going to clone while holding a lxccontainer, increment |
72d0e1cb SG |
177 | * c->numthreads (under privlock) before forking. When deleting, |
178 | * decrement numthreads under privlock, then if it hits 0 you can delete. | |
179 | * Do not ever use a lxccontainer whose numthreads you did not bump. | |
180 | */ | |
181 | ||
182 | static void lxc_container_free(struct lxc_container *c) | |
183 | { | |
184 | if (!c) | |
185 | return; | |
186 | ||
187 | if (c->configfile) { | |
188 | free(c->configfile); | |
189 | c->configfile = NULL; | |
190 | } | |
191 | if (c->error_string) { | |
192 | free(c->error_string); | |
193 | c->error_string = NULL; | |
194 | } | |
d95db067 | 195 | if (c->slock) { |
df271a59 | 196 | lxc_putlock(c->slock); |
d95db067 DE |
197 | c->slock = NULL; |
198 | } | |
72d0e1cb | 199 | if (c->privlock) { |
df271a59 | 200 | lxc_putlock(c->privlock); |
72d0e1cb SG |
201 | c->privlock = NULL; |
202 | } | |
203 | if (c->name) { | |
204 | free(c->name); | |
205 | c->name = NULL; | |
206 | } | |
d95db067 DE |
207 | if (c->lxc_conf) { |
208 | lxc_conf_free(c->lxc_conf); | |
209 | c->lxc_conf = NULL; | |
210 | } | |
2a59a681 SH |
211 | if (c->config_path) { |
212 | free(c->config_path); | |
213 | c->config_path = NULL; | |
214 | } | |
72d0e1cb SG |
215 | free(c); |
216 | } | |
217 | ||
43d1aa34 SH |
218 | /* |
219 | * Consider the following case: | |
220 | freer | racing get()er | |
221 | ================================================================== | |
222 | lxc_container_put() | lxc_container_get() | |
223 | \ lxclock(c->privlock) | c->numthreads < 1? (no) | |
224 | \ c->numthreads = 0 | \ lxclock(c->privlock) -> waits | |
225 | \ lxcunlock() | \ | |
226 | \ lxc_container_free() | \ lxclock() returns | |
227 | | \ c->numthreads < 1 -> return 0 | |
228 | \ \ (free stuff) | | |
229 | \ \ sem_destroy(privlock) | | |
230 | ||
231 | * When the get()er checks numthreads the first time, one of the following | |
232 | * is true: | |
233 | * 1. freer has set numthreads = 0. get() returns 0 | |
234 | * 2. freer is between lxclock and setting numthreads to 0. get()er will | |
235 | * sem_wait on privlock, get lxclock after freer() drops it, then see | |
236 | * numthreads is 0 and exit without touching lxclock again.. | |
237 | * 3. freer has not yet locked privlock. If get()er runs first, then put()er | |
238 | * will see --numthreads = 1 and not call lxc_container_free(). | |
239 | */ | |
240 | ||
72d0e1cb SG |
241 | int lxc_container_get(struct lxc_container *c) |
242 | { | |
243 | if (!c) | |
244 | return 0; | |
245 | ||
43d1aa34 SH |
246 | // if someone else has already started freeing the container, don't |
247 | // try to take the lock, which may be invalid | |
248 | if (c->numthreads < 1) | |
249 | return 0; | |
250 | ||
5cee8c50 | 251 | if (container_mem_lock(c)) |
72d0e1cb SG |
252 | return 0; |
253 | if (c->numthreads < 1) { | |
254 | // bail without trying to unlock, bc the privlock is now probably | |
255 | // in freed memory | |
256 | return 0; | |
257 | } | |
258 | c->numthreads++; | |
5cee8c50 | 259 | container_mem_unlock(c); |
72d0e1cb SG |
260 | return 1; |
261 | } | |
262 | ||
263 | int lxc_container_put(struct lxc_container *c) | |
264 | { | |
265 | if (!c) | |
266 | return -1; | |
5cee8c50 | 267 | if (container_mem_lock(c)) |
72d0e1cb SG |
268 | return -1; |
269 | if (--c->numthreads < 1) { | |
5cee8c50 | 270 | container_mem_unlock(c); |
72d0e1cb SG |
271 | lxc_container_free(c); |
272 | return 1; | |
273 | } | |
5cee8c50 | 274 | container_mem_unlock(c); |
72d0e1cb SG |
275 | return 0; |
276 | } | |
277 | ||
72d0e1cb SG |
278 | static bool lxcapi_is_defined(struct lxc_container *c) |
279 | { | |
280 | struct stat statbuf; | |
281 | bool ret = false; | |
282 | int statret; | |
283 | ||
284 | if (!c) | |
285 | return false; | |
286 | ||
5cee8c50 | 287 | if (container_mem_lock(c)) |
72d0e1cb SG |
288 | return false; |
289 | if (!c->configfile) | |
290 | goto out; | |
291 | statret = stat(c->configfile, &statbuf); | |
292 | if (statret != 0) | |
293 | goto out; | |
294 | ret = true; | |
295 | ||
296 | out: | |
5cee8c50 | 297 | container_mem_unlock(c); |
72d0e1cb SG |
298 | return ret; |
299 | } | |
300 | ||
301 | static const char *lxcapi_state(struct lxc_container *c) | |
302 | { | |
72d0e1cb SG |
303 | lxc_state_t s; |
304 | ||
305 | if (!c) | |
306 | return NULL; | |
13f5be62 | 307 | s = lxc_getstate(c->name, c->config_path); |
39dc698c | 308 | return lxc_state2str(s); |
72d0e1cb SG |
309 | } |
310 | ||
39dc698c | 311 | static bool is_stopped(struct lxc_container *c) |
794dd120 SH |
312 | { |
313 | lxc_state_t s; | |
13f5be62 | 314 | s = lxc_getstate(c->name, c->config_path); |
794dd120 SH |
315 | return (s == STOPPED); |
316 | } | |
317 | ||
72d0e1cb SG |
318 | static bool lxcapi_is_running(struct lxc_container *c) |
319 | { | |
320 | const char *s; | |
321 | ||
322 | if (!c) | |
323 | return false; | |
324 | s = lxcapi_state(c); | |
325 | if (!s || strcmp(s, "STOPPED") == 0) | |
326 | return false; | |
327 | return true; | |
328 | } | |
329 | ||
330 | static bool lxcapi_freeze(struct lxc_container *c) | |
331 | { | |
332 | int ret; | |
333 | if (!c) | |
334 | return false; | |
335 | ||
9123e471 | 336 | ret = lxc_freeze(c->name, c->config_path); |
72d0e1cb SG |
337 | if (ret) |
338 | return false; | |
339 | return true; | |
340 | } | |
341 | ||
342 | static bool lxcapi_unfreeze(struct lxc_container *c) | |
343 | { | |
344 | int ret; | |
345 | if (!c) | |
346 | return false; | |
347 | ||
9123e471 | 348 | ret = lxc_unfreeze(c->name, c->config_path); |
72d0e1cb SG |
349 | if (ret) |
350 | return false; | |
351 | return true; | |
352 | } | |
353 | ||
b5159817 | 354 | static int lxcapi_console_getfd(struct lxc_container *c, int *ttynum, int *masterfd) |
0115f8fd DE |
355 | { |
356 | int ttyfd; | |
357 | if (!c) | |
358 | return -1; | |
359 | ||
b5159817 | 360 | ttyfd = lxc_console_getfd(c, ttynum, masterfd); |
0115f8fd DE |
361 | return ttyfd; |
362 | } | |
363 | ||
b5159817 DE |
364 | static int lxcapi_console(struct lxc_container *c, int ttynum, int stdinfd, |
365 | int stdoutfd, int stderrfd, int escape) | |
366 | { | |
367 | return lxc_console(c, ttynum, stdinfd, stdoutfd, stderrfd, escape); | |
368 | } | |
369 | ||
72d0e1cb SG |
370 | static pid_t lxcapi_init_pid(struct lxc_container *c) |
371 | { | |
72d0e1cb SG |
372 | if (!c) |
373 | return -1; | |
374 | ||
5cee8c50 | 375 | return lxc_cmd_get_init_pid(c->name, c->config_path); |
72d0e1cb SG |
376 | } |
377 | ||
12a50cc6 | 378 | static bool load_config_locked(struct lxc_container *c, const char *fname) |
8eb5694b SH |
379 | { |
380 | if (!c->lxc_conf) | |
381 | c->lxc_conf = lxc_conf_init(); | |
382 | if (c->lxc_conf && !lxc_config_read(fname, c->lxc_conf)) | |
383 | return true; | |
384 | return false; | |
385 | } | |
386 | ||
12a50cc6 | 387 | static bool lxcapi_load_config(struct lxc_container *c, const char *alt_file) |
72d0e1cb | 388 | { |
39dc698c SH |
389 | bool ret = false, need_disklock = false; |
390 | int lret; | |
12a50cc6 | 391 | const char *fname; |
72d0e1cb SG |
392 | if (!c) |
393 | return false; | |
394 | ||
395 | fname = c->configfile; | |
396 | if (alt_file) | |
397 | fname = alt_file; | |
398 | if (!fname) | |
399 | return false; | |
39dc698c SH |
400 | /* |
401 | * If we're reading something other than the container's config, | |
402 | * we only need to lock the in-memory container. If loading the | |
403 | * container's config file, take the disk lock. | |
404 | */ | |
405 | if (strcmp(fname, c->configfile) == 0) | |
406 | need_disklock = true; | |
407 | ||
408 | if (need_disklock) | |
409 | lret = container_disk_lock(c); | |
410 | else | |
411 | lret = container_mem_lock(c); | |
412 | if (lret) | |
72d0e1cb | 413 | return false; |
39dc698c | 414 | |
8eb5694b | 415 | ret = load_config_locked(c, fname); |
39dc698c SH |
416 | |
417 | if (need_disklock) | |
418 | container_disk_unlock(c); | |
419 | else | |
420 | container_mem_unlock(c); | |
72d0e1cb SG |
421 | return ret; |
422 | } | |
423 | ||
424 | static void lxcapi_want_daemonize(struct lxc_container *c) | |
425 | { | |
426 | if (!c) | |
427 | return; | |
f02abefe | 428 | if (container_mem_lock(c)) { |
3bc449ed SH |
429 | ERROR("Error getting mem lock"); |
430 | return; | |
431 | } | |
72d0e1cb | 432 | c->daemonize = 1; |
3bc449ed | 433 | container_mem_unlock(c); |
72d0e1cb SG |
434 | } |
435 | ||
12a50cc6 | 436 | static bool lxcapi_wait(struct lxc_container *c, const char *state, int timeout) |
7a44c8b4 SG |
437 | { |
438 | int ret; | |
439 | ||
440 | if (!c) | |
441 | return false; | |
442 | ||
67e571de | 443 | ret = lxc_wait(c->name, state, timeout, c->config_path); |
7a44c8b4 SG |
444 | return ret == 0; |
445 | } | |
446 | ||
447 | ||
448 | static bool wait_on_daemonized_start(struct lxc_container *c) | |
449 | { | |
450 | /* we'll probably want to make this timeout configurable? */ | |
697fa639 | 451 | int timeout = 5, ret, status; |
7a44c8b4 | 452 | |
697fa639 SH |
453 | /* |
454 | * our child is going to fork again, then exit. reap the | |
455 | * child | |
456 | */ | |
457 | ret = wait(&status); | |
458 | if (ret == -1 || !WIFEXITED(status) || WEXITSTATUS(status) != 0) | |
459 | DEBUG("failed waiting for first dual-fork child"); | |
7a44c8b4 SG |
460 | return lxcapi_wait(c, "RUNNING", timeout); |
461 | } | |
462 | ||
72d0e1cb SG |
463 | /* |
464 | * I can't decide if it'd be more convenient for callers if we accept '...', | |
465 | * or a null-terminated array (i.e. execl vs execv) | |
466 | */ | |
12a50cc6 | 467 | static bool lxcapi_start(struct lxc_container *c, int useinit, char * const argv[]) |
72d0e1cb SG |
468 | { |
469 | int ret; | |
470 | struct lxc_conf *conf; | |
471 | int daemonize = 0; | |
472 | char *default_args[] = { | |
473 | "/sbin/init", | |
474 | '\0', | |
475 | }; | |
476 | ||
477 | /* container exists */ | |
478 | if (!c) | |
479 | return false; | |
480 | /* container has been setup */ | |
481 | if (!c->lxc_conf) | |
482 | return false; | |
483 | ||
3e625e2d SH |
484 | if ((ret = ongoing_create(c)) < 0) { |
485 | ERROR("Error checking for incomplete creation"); | |
486 | return false; | |
487 | } | |
488 | if (ret == 2) { | |
489 | ERROR("Error: %s creation was not completed", c->name); | |
490 | c->destroy(c); | |
491 | return false; | |
492 | } else if (ret == 1) { | |
493 | ERROR("Error: creation of %s is ongoing", c->name); | |
494 | return false; | |
495 | } | |
496 | ||
72d0e1cb SG |
497 | /* is this app meant to be run through lxcinit, as in lxc-execute? */ |
498 | if (useinit && !argv) | |
499 | return false; | |
500 | ||
5cee8c50 | 501 | if (container_mem_lock(c)) |
72d0e1cb SG |
502 | return false; |
503 | conf = c->lxc_conf; | |
504 | daemonize = c->daemonize; | |
5cee8c50 | 505 | container_mem_unlock(c); |
72d0e1cb SG |
506 | |
507 | if (useinit) { | |
13f5be62 | 508 | ret = lxc_execute(c->name, argv, 1, conf, c->config_path); |
72d0e1cb SG |
509 | return ret == 0 ? true : false; |
510 | } | |
511 | ||
512 | if (!argv) | |
513 | argv = default_args; | |
514 | ||
515 | /* | |
516 | * say, I'm not sure - what locks do we want here? Any? | |
517 | * Is liblxc's locking enough here to protect the on disk | |
518 | * container? We don't want to exclude things like lxc_info | |
519 | * while container is running... | |
520 | */ | |
521 | if (daemonize) { | |
522 | if (!lxc_container_get(c)) | |
523 | return false; | |
e51d4895 | 524 | lxc_monitord_spawn(c->config_path); |
71454076 | 525 | |
5cee8c50 | 526 | if (process_lock()) |
71454076 | 527 | return false; |
72d0e1cb SG |
528 | pid_t pid = fork(); |
529 | if (pid < 0) { | |
530 | lxc_container_put(c); | |
5cee8c50 | 531 | process_unlock(); |
72d0e1cb SG |
532 | return false; |
533 | } | |
71454076 DE |
534 | if (pid != 0) { |
535 | ret = wait_on_daemonized_start(c); | |
5cee8c50 | 536 | process_unlock(); |
71454076 DE |
537 | return ret; |
538 | } | |
5cee8c50 | 539 | process_unlock(); |
697fa639 SH |
540 | /* second fork to be reparented by init */ |
541 | pid = fork(); | |
542 | if (pid < 0) { | |
543 | SYSERROR("Error doing dual-fork"); | |
544 | return false; | |
545 | } | |
546 | if (pid != 0) | |
547 | exit(0); | |
72d0e1cb | 548 | /* like daemon(), chdir to / and redirect 0,1,2 to /dev/null */ |
c278cef2 SH |
549 | if (chdir("/")) { |
550 | SYSERROR("Error chdir()ing to /."); | |
551 | return false; | |
552 | } | |
72d0e1cb SG |
553 | close(0); |
554 | close(1); | |
555 | close(2); | |
eddaaafd | 556 | open("/dev/zero", O_RDONLY); |
72d0e1cb SG |
557 | open("/dev/null", O_RDWR); |
558 | open("/dev/null", O_RDWR); | |
559 | setsid(); | |
560 | } | |
561 | ||
72d0e1cb SG |
562 | reboot: |
563 | conf->reboot = 0; | |
13f5be62 | 564 | ret = lxc_start(c->name, argv, conf, c->config_path); |
72d0e1cb SG |
565 | |
566 | if (conf->reboot) { | |
567 | INFO("container requested reboot"); | |
568 | conf->reboot = 0; | |
72d0e1cb SG |
569 | goto reboot; |
570 | } | |
571 | ||
572 | if (daemonize) { | |
573 | lxc_container_put(c); | |
574 | exit (ret == 0 ? true : false); | |
575 | } else { | |
576 | return (ret == 0 ? true : false); | |
577 | } | |
578 | } | |
579 | ||
580 | /* | |
581 | * note there MUST be an ending NULL | |
582 | */ | |
583 | static bool lxcapi_startl(struct lxc_container *c, int useinit, ...) | |
584 | { | |
585 | va_list ap; | |
586 | char **inargs = NULL, **temp; | |
587 | int n_inargs = 0; | |
588 | bool bret = false; | |
589 | ||
590 | /* container exists */ | |
591 | if (!c) | |
592 | return false; | |
593 | ||
594 | /* build array of arguments if any */ | |
595 | va_start(ap, useinit); | |
596 | while (1) { | |
597 | char *arg; | |
598 | arg = va_arg(ap, char *); | |
599 | if (!arg) | |
600 | break; | |
601 | n_inargs++; | |
602 | temp = realloc(inargs, n_inargs * sizeof(*inargs)); | |
586d4e9b SH |
603 | if (!temp) { |
604 | va_end(ap); | |
72d0e1cb | 605 | goto out; |
586d4e9b | 606 | } |
72d0e1cb SG |
607 | inargs = temp; |
608 | inargs[n_inargs - 1] = strdup(arg); // not sure if it's safe not to copy | |
609 | } | |
610 | va_end(ap); | |
611 | ||
612 | /* add trailing NULL */ | |
613 | if (n_inargs) { | |
614 | n_inargs++; | |
615 | temp = realloc(inargs, n_inargs * sizeof(*inargs)); | |
616 | if (!temp) | |
617 | goto out; | |
618 | inargs = temp; | |
619 | inargs[n_inargs - 1] = NULL; | |
620 | } | |
621 | ||
622 | bret = lxcapi_start(c, useinit, inargs); | |
623 | ||
624 | out: | |
625 | if (inargs) { | |
626 | int i; | |
627 | for (i = 0; i < n_inargs; i++) { | |
628 | if (inargs[i]) | |
629 | free(inargs[i]); | |
630 | } | |
631 | free(inargs); | |
632 | } | |
633 | ||
634 | return bret; | |
635 | } | |
636 | ||
637 | static bool lxcapi_stop(struct lxc_container *c) | |
638 | { | |
639 | int ret; | |
640 | ||
641 | if (!c) | |
642 | return false; | |
643 | ||
ef6e34ee | 644 | ret = lxc_cmd_stop(c->name, c->config_path); |
72d0e1cb SG |
645 | |
646 | return ret == 0; | |
72d0e1cb SG |
647 | } |
648 | ||
72d0e1cb SG |
649 | /* |
650 | * create the standard expected container dir | |
651 | */ | |
652 | static bool create_container_dir(struct lxc_container *c) | |
653 | { | |
654 | char *s; | |
655 | int len, ret; | |
656 | ||
2a59a681 | 657 | len = strlen(c->config_path) + strlen(c->name) + 2; |
72d0e1cb SG |
658 | s = malloc(len); |
659 | if (!s) | |
660 | return false; | |
2a59a681 | 661 | ret = snprintf(s, len, "%s/%s", c->config_path, c->name); |
72d0e1cb SG |
662 | if (ret < 0 || ret >= len) { |
663 | free(s); | |
664 | return false; | |
665 | } | |
666 | ret = mkdir(s, 0755); | |
667 | if (ret) { | |
668 | if (errno == EEXIST) | |
669 | ret = 0; | |
670 | else | |
671 | SYSERROR("failed to create container path for %s\n", c->name); | |
672 | } | |
673 | free(s); | |
674 | return ret == 0; | |
675 | } | |
676 | ||
1897e3bc SH |
677 | static const char *lxcapi_get_config_path(struct lxc_container *c); |
678 | static bool lxcapi_set_config_item(struct lxc_container *c, const char *key, const char *v); | |
679 | ||
72d0e1cb | 680 | /* |
1897e3bc SH |
681 | * do_bdev_create: thin wrapper around bdev_create(). Like bdev_create(), |
682 | * it returns a mounted bdev on success, NULL on error. | |
72d0e1cb | 683 | */ |
1897e3bc SH |
684 | static struct bdev *do_bdev_create(struct lxc_container *c, const char *type, |
685 | struct bdev_specs *specs) | |
686 | { | |
687 | char *dest; | |
688 | const char *lxcpath = lxcapi_get_config_path(c); | |
689 | size_t len; | |
690 | struct bdev *bdev; | |
691 | int ret; | |
692 | ||
693 | /* lxcpath/lxcname/rootfs */ | |
694 | len = strlen(c->name) + strlen(lxcpath) + 9; | |
695 | dest = alloca(len); | |
696 | ret = snprintf(dest, len, "%s/%s/rootfs", lxcpath, c->name); | |
697 | if (ret < 0 || ret >= len) | |
698 | return NULL; | |
699 | ||
700 | bdev = bdev_create(dest, type, c->name, specs); | |
701 | if (!bdev) | |
702 | return NULL; | |
703 | lxcapi_set_config_item(c, "lxc.rootfs", bdev->src); | |
704 | return bdev; | |
705 | } | |
706 | ||
cbee8106 SH |
707 | /* |
708 | * Given the '-t' template option to lxc-create, figure out what to | |
709 | * do. If the template is a full executable path, use that. If it | |
710 | * is something like 'sshd', then return $templatepath/lxc-sshd. If | |
711 | * no template was passed in, return NULL (this is ok). | |
712 | * On error return (char *) -1. | |
713 | */ | |
714 | char *get_template_path(const char *t) | |
715 | { | |
716 | int ret, len; | |
717 | char *tpath; | |
718 | ||
719 | if (!t) | |
720 | return NULL; | |
721 | ||
722 | if (t[0] == '/' && access(t, X_OK) == 0) { | |
723 | tpath = strdup(t); | |
724 | if (!tpath) | |
725 | return (char *) -1; | |
726 | return tpath; | |
727 | } | |
728 | ||
729 | len = strlen(LXCTEMPLATEDIR) + strlen(t) + strlen("/lxc-") + 1; | |
730 | tpath = malloc(len); | |
731 | if (!tpath) | |
732 | return (char *) -1; | |
733 | ret = snprintf(tpath, len, "%s/lxc-%s", LXCTEMPLATEDIR, t); | |
734 | if (ret < 0 || ret >= len) { | |
735 | free(tpath); | |
736 | return (char *) -1; | |
737 | } | |
738 | if (access(tpath, X_OK) < 0) { | |
739 | SYSERROR("bad template: %s\n", t); | |
740 | free(tpath); | |
741 | return (char *) -1; | |
742 | } | |
743 | ||
744 | return tpath; | |
745 | } | |
746 | ||
96b3cb40 | 747 | static char *lxcbasename(char *path) |
72d0e1cb | 748 | { |
96b3cb40 SH |
749 | char *p = path + strlen(path) - 1; |
750 | while (*p != '/' && p > path) | |
751 | p--; | |
752 | return p; | |
753 | } | |
72d0e1cb | 754 | |
dc23c1c8 | 755 | static bool create_run_template(struct lxc_container *c, char *tpath, bool quiet, |
96b3cb40 SH |
756 | char *const argv[]) |
757 | { | |
758 | pid_t pid; | |
72d0e1cb | 759 | |
72d0e1cb | 760 | if (!tpath) |
96b3cb40 | 761 | return true; |
72d0e1cb SG |
762 | |
763 | pid = fork(); | |
764 | if (pid < 0) { | |
765 | SYSERROR("failed to fork task for container creation template\n"); | |
96b3cb40 | 766 | return false; |
72d0e1cb SG |
767 | } |
768 | ||
769 | if (pid == 0) { // child | |
1897e3bc SH |
770 | char *patharg, *namearg, *rootfsarg, *src; |
771 | struct bdev *bdev = NULL; | |
72d0e1cb | 772 | int i; |
96b3cb40 SH |
773 | int ret, len, nargs = 0; |
774 | char **newargv; | |
72d0e1cb | 775 | |
dc23c1c8 SH |
776 | if (quiet) { |
777 | close(0); | |
778 | close(1); | |
779 | close(2); | |
780 | open("/dev/zero", O_RDONLY); | |
781 | open("/dev/null", O_RDWR); | |
782 | open("/dev/null", O_RDWR); | |
783 | } | |
1897e3bc SH |
784 | if (unshare(CLONE_NEWNS) < 0) { |
785 | ERROR("error unsharing mounts"); | |
786 | exit(1); | |
787 | } | |
788 | ||
789 | src = c->lxc_conf->rootfs.path; | |
790 | /* | |
791 | * for an overlayfs create, what the user wants is the template to fill | |
792 | * in what will become the readonly lower layer. So don't mount for | |
793 | * the template | |
794 | */ | |
795 | if (strncmp(src, "overlayfs:", 10) == 0) { | |
796 | src = overlayfs_getlower(src+10); | |
797 | } | |
798 | bdev = bdev_init(src, c->lxc_conf->rootfs.mount, NULL); | |
799 | if (!bdev) { | |
800 | ERROR("Error opening rootfs"); | |
801 | exit(1); | |
802 | } | |
803 | ||
804 | if (bdev->ops->mount(bdev) < 0) { | |
805 | ERROR("Error mounting rootfs"); | |
806 | exit(1); | |
807 | } | |
808 | ||
72d0e1cb SG |
809 | /* |
810 | * create our new array, pre-pend the template name and | |
811 | * base args | |
812 | */ | |
813 | if (argv) | |
1897e3bc SH |
814 | for (nargs = 0; argv[nargs]; nargs++) ; |
815 | nargs += 4; // template, path, rootfs and name args | |
72d0e1cb SG |
816 | newargv = malloc(nargs * sizeof(*newargv)); |
817 | if (!newargv) | |
818 | exit(1); | |
96b3cb40 | 819 | newargv[0] = lxcbasename(tpath); |
72d0e1cb | 820 | |
2a59a681 | 821 | len = strlen(c->config_path) + strlen(c->name) + strlen("--path=") + 2; |
72d0e1cb SG |
822 | patharg = malloc(len); |
823 | if (!patharg) | |
824 | exit(1); | |
2a59a681 | 825 | ret = snprintf(patharg, len, "--path=%s/%s", c->config_path, c->name); |
72d0e1cb SG |
826 | if (ret < 0 || ret >= len) |
827 | exit(1); | |
828 | newargv[1] = patharg; | |
829 | len = strlen("--name=") + strlen(c->name) + 1; | |
830 | namearg = malloc(len); | |
831 | if (!namearg) | |
832 | exit(1); | |
833 | ret = snprintf(namearg, len, "--name=%s", c->name); | |
834 | if (ret < 0 || ret >= len) | |
835 | exit(1); | |
836 | newargv[2] = namearg; | |
837 | ||
1897e3bc SH |
838 | len = strlen("--rootfs=") + 1 + strlen(bdev->dest); |
839 | rootfsarg = malloc(len); | |
840 | if (!rootfsarg) | |
841 | exit(1); | |
842 | ret = snprintf(rootfsarg, len, "--rootfs=%s", bdev->dest); | |
843 | if (ret < 0 || ret >= len) | |
844 | exit(1); | |
845 | newargv[3] = rootfsarg; | |
846 | ||
72d0e1cb SG |
847 | /* add passed-in args */ |
848 | if (argv) | |
1897e3bc SH |
849 | for (i = 4; i < nargs; i++) |
850 | newargv[i] = argv[i-4]; | |
72d0e1cb SG |
851 | |
852 | /* add trailing NULL */ | |
853 | nargs++; | |
854 | newargv = realloc(newargv, nargs * sizeof(*newargv)); | |
855 | if (!newargv) | |
856 | exit(1); | |
857 | newargv[nargs - 1] = NULL; | |
858 | ||
859 | /* execute */ | |
e6a19d26 | 860 | execv(tpath, newargv); |
72d0e1cb SG |
861 | SYSERROR("failed to execute template %s", tpath); |
862 | exit(1); | |
863 | } | |
864 | ||
9be53773 SH |
865 | if (wait_for_pid(pid) != 0) { |
866 | ERROR("container creation template for %s failed\n", c->name); | |
96b3cb40 SH |
867 | return false; |
868 | } | |
869 | ||
870 | return true; | |
871 | } | |
872 | ||
3ce74686 SH |
873 | bool prepend_lxc_header(char *path, const char *t, char *const argv[]) |
874 | { | |
875 | size_t flen; | |
876 | char *contents, *tpath; | |
3ce74686 | 877 | FILE *f; |
52026772 SH |
878 | #if HAVE_LIBGNUTLS |
879 | int i, ret; | |
3ce74686 SH |
880 | unsigned char md_value[SHA_DIGEST_LENGTH]; |
881 | bool have_tpath = false; | |
52026772 | 882 | #endif |
3ce74686 SH |
883 | |
884 | if ((f = fopen(path, "r")) == NULL) { | |
885 | SYSERROR("Opening old config"); | |
886 | return false; | |
887 | } | |
888 | if (fseek(f, 0, SEEK_END) < 0) { | |
889 | SYSERROR("Seeking to end of old config file"); | |
890 | fclose(f); | |
891 | return false; | |
892 | } | |
893 | if ((flen = ftell(f)) < 0) { | |
894 | SYSERROR("telling size of old config"); | |
895 | fclose(f); | |
896 | return false; | |
897 | } | |
898 | if (fseek(f, 0, SEEK_SET) < 0) { | |
899 | SYSERROR("rewinding old config"); | |
900 | fclose(f); | |
901 | return false; | |
902 | } | |
903 | if ((contents = malloc(flen + 1)) == NULL) { | |
904 | SYSERROR("out of memory"); | |
905 | fclose(f); | |
906 | return false; | |
907 | } | |
908 | if (fread(contents, 1, flen, f) != flen) { | |
909 | SYSERROR("Reading old config"); | |
910 | free(contents); | |
911 | fclose(f); | |
912 | return false; | |
913 | } | |
914 | contents[flen] = '\0'; | |
915 | if (fclose(f) < 0) { | |
916 | SYSERROR("closing old config"); | |
917 | free(contents); | |
918 | return false; | |
919 | } | |
920 | ||
921 | if ((tpath = get_template_path(t)) < 0) { | |
922 | ERROR("bad template: %s\n", t); | |
923 | free(contents); | |
924 | return false; | |
925 | } | |
926 | ||
927 | #if HAVE_LIBGNUTLS | |
928 | if (tpath) { | |
929 | have_tpath = true; | |
930 | ret = sha1sum_file(tpath, md_value); | |
931 | if (ret < 0) { | |
932 | ERROR("Error getting sha1sum of %s", tpath); | |
933 | free(contents); | |
934 | return false; | |
935 | } | |
936 | free(tpath); | |
937 | } | |
938 | #endif | |
939 | ||
940 | if ((f = fopen(path, "w")) == NULL) { | |
941 | SYSERROR("reopening config for writing"); | |
942 | free(contents); | |
943 | return false; | |
944 | } | |
945 | fprintf(f, "# Template used to create this container: %s\n", t); | |
946 | if (argv) { | |
947 | fprintf(f, "# Parameters passed to the template:"); | |
948 | while (*argv) { | |
949 | fprintf(f, " %s", *argv); | |
950 | argv++; | |
951 | } | |
952 | fprintf(f, "\n"); | |
953 | } | |
954 | #if HAVE_LIBGNUTLS | |
955 | if (have_tpath) { | |
956 | fprintf(f, "# Template script checksum (SHA-1): "); | |
957 | for (i=0; i<SHA_DIGEST_LENGTH; i++) | |
958 | fprintf(f, "%02x", md_value[i]); | |
959 | fprintf(f, "\n"); | |
960 | } | |
961 | #endif | |
962 | if (fwrite(contents, 1, flen, f) != flen) { | |
963 | SYSERROR("Writing original contents"); | |
964 | free(contents); | |
965 | fclose(f); | |
966 | return false; | |
967 | } | |
968 | free(contents); | |
969 | if (fclose(f) < 0) { | |
970 | SYSERROR("Closing config file after write"); | |
971 | return false; | |
972 | } | |
973 | return true; | |
974 | } | |
975 | ||
96b3cb40 SH |
976 | static bool lxcapi_destroy(struct lxc_container *c); |
977 | /* | |
978 | * lxcapi_create: | |
979 | * create a container with the given parameters. | |
980 | * @c: container to be created. It has the lxcpath, name, and a starting | |
981 | * configuration already set | |
982 | * @t: the template to execute to instantiate the root filesystem and | |
983 | * adjust the configuration. | |
984 | * @bdevtype: backing store type to use. If NULL, dir will be used. | |
985 | * @specs: additional parameters for the backing store, i.e. LVM vg to | |
986 | * use. | |
987 | * | |
988 | * @argv: the arguments to pass to the template, terminated by NULL. If no | |
989 | * arguments, you can just pass NULL. | |
990 | */ | |
991 | static bool lxcapi_create(struct lxc_container *c, const char *t, | |
dc23c1c8 | 992 | const char *bdevtype, struct bdev_specs *specs, int flags, |
96b3cb40 SH |
993 | char *const argv[]) |
994 | { | |
995 | bool bret = false; | |
996 | pid_t pid; | |
cbee8106 SH |
997 | char *tpath; |
998 | int partial_fd; | |
96b3cb40 SH |
999 | |
1000 | if (!c) | |
1001 | return false; | |
1002 | ||
cbee8106 | 1003 | if ((tpath = get_template_path(t)) < 0) { |
96b3cb40 SH |
1004 | ERROR("bad template: %s\n", t); |
1005 | goto out; | |
1006 | } | |
1007 | ||
1008 | if (!c->save_config(c, NULL)) { | |
1009 | ERROR("failed to save starting configuration for %s\n", c->name); | |
1010 | goto out; | |
1011 | } | |
1012 | ||
1013 | /* container is already created if we have a config and rootfs.path is accessible */ | |
1014 | if (lxcapi_is_defined(c) && c->lxc_conf && c->lxc_conf->rootfs.path && access(c->lxc_conf->rootfs.path, F_OK) == 0) | |
1015 | goto out; | |
1016 | ||
1017 | /* Mark that this container is being created */ | |
1018 | if ((partial_fd = create_partial(c)) < 0) | |
1019 | goto out; | |
1020 | ||
1021 | /* no need to get disk lock bc we have the partial locked */ | |
1022 | ||
1023 | /* | |
1024 | * Create the backing store | |
1025 | * Note we can't do this in the same task as we use to execute the | |
1026 | * template because of the way zfs works. | |
1027 | * After you 'zfs create', zfs mounts the fs only in the initial | |
1028 | * namespace. | |
1029 | */ | |
1030 | pid = fork(); | |
1031 | if (pid < 0) { | |
1032 | SYSERROR("failed to fork task for container creation template\n"); | |
8eb5694b SH |
1033 | goto out_unlock; |
1034 | } | |
1035 | ||
96b3cb40 SH |
1036 | if (pid == 0) { // child |
1037 | struct bdev *bdev = NULL; | |
1038 | ||
1039 | if (!(bdev = do_bdev_create(c, bdevtype, specs))) { | |
1040 | ERROR("Error creating backing store type %s for %s", | |
1041 | bdevtype ? bdevtype : "(none)", c->name); | |
1042 | exit(1); | |
1043 | } | |
1044 | ||
1045 | /* save config file again to store the new rootfs location */ | |
1046 | if (!c->save_config(c, NULL)) { | |
1047 | ERROR("failed to save starting configuration for %s\n", c->name); | |
1048 | // parent task won't see bdev in config so we delete it | |
1049 | bdev->ops->umount(bdev); | |
1050 | bdev->ops->destroy(bdev); | |
1051 | exit(1); | |
1052 | } | |
1053 | exit(0); | |
1054 | } | |
1055 | if (wait_for_pid(pid) != 0) | |
1056 | goto out; | |
1057 | ||
1058 | /* reload config to get the rootfs */ | |
1059 | if (c->lxc_conf) | |
1060 | lxc_conf_free(c->lxc_conf); | |
1061 | c->lxc_conf = NULL; | |
1062 | if (!load_config_locked(c, c->configfile)) | |
1063 | goto out; | |
1064 | ||
dc23c1c8 | 1065 | if (!create_run_template(c, tpath, !!(flags & LXC_CREATE_QUIET), argv)) |
96b3cb40 SH |
1066 | goto out_unlock; |
1067 | ||
8eb5694b SH |
1068 | // now clear out the lxc_conf we have, reload from the created |
1069 | // container | |
1070 | if (c->lxc_conf) | |
1071 | lxc_conf_free(c->lxc_conf); | |
1072 | c->lxc_conf = NULL; | |
3ce74686 SH |
1073 | |
1074 | if (!prepend_lxc_header(c->configfile, tpath, argv)) { | |
1075 | ERROR("Error prepending header to configuration file"); | |
1076 | goto out_unlock; | |
1077 | } | |
8eb5694b | 1078 | bret = load_config_locked(c, c->configfile); |
72d0e1cb SG |
1079 | |
1080 | out_unlock: | |
3e625e2d SH |
1081 | if (partial_fd >= 0) |
1082 | remove_partial(c, partial_fd); | |
72d0e1cb SG |
1083 | out: |
1084 | if (tpath) | |
1085 | free(tpath); | |
1897e3bc SH |
1086 | if (!bret && c) |
1087 | lxcapi_destroy(c); | |
72d0e1cb SG |
1088 | return bret; |
1089 | } | |
1090 | ||
3e625e2d SH |
1091 | static bool lxcapi_reboot(struct lxc_container *c) |
1092 | { | |
1093 | pid_t pid; | |
1094 | ||
1095 | if (!c) | |
1096 | return false; | |
1097 | if (!c->is_running(c)) | |
1098 | return false; | |
1099 | pid = c->init_pid(c); | |
1100 | if (pid <= 0) | |
1101 | return false; | |
1102 | if (kill(pid, SIGINT) < 0) | |
1103 | return false; | |
1104 | return true; | |
1105 | ||
1106 | } | |
1107 | ||
72d0e1cb SG |
1108 | static bool lxcapi_shutdown(struct lxc_container *c, int timeout) |
1109 | { | |
1110 | bool retv; | |
1111 | pid_t pid; | |
1112 | ||
1113 | if (!c) | |
1114 | return false; | |
1115 | ||
1116 | if (!timeout) | |
1117 | timeout = -1; | |
1118 | if (!c->is_running(c)) | |
1119 | return true; | |
1120 | pid = c->init_pid(c); | |
1121 | if (pid <= 0) | |
1122 | return true; | |
1123 | kill(pid, SIGPWR); | |
1124 | retv = c->wait(c, "STOPPED", timeout); | |
f6144ed4 | 1125 | if (!retv && timeout > 0) { |
72d0e1cb SG |
1126 | c->stop(c); |
1127 | retv = c->wait(c, "STOPPED", 0); // 0 means don't wait | |
1128 | } | |
1129 | return retv; | |
1130 | } | |
1131 | ||
1897e3bc | 1132 | static bool lxcapi_createl(struct lxc_container *c, const char *t, |
dc23c1c8 | 1133 | const char *bdevtype, struct bdev_specs *specs, int flags, ...) |
72d0e1cb SG |
1134 | { |
1135 | bool bret = false; | |
1136 | char **args = NULL, **temp; | |
1137 | va_list ap; | |
1138 | int nargs = 0; | |
1139 | ||
1140 | if (!c) | |
1141 | return false; | |
1142 | ||
1143 | /* | |
1144 | * since we're going to wait for create to finish, I don't think we | |
1145 | * need to get a copy of the arguments. | |
1146 | */ | |
dc23c1c8 | 1147 | va_start(ap, flags); |
72d0e1cb SG |
1148 | while (1) { |
1149 | char *arg; | |
1150 | arg = va_arg(ap, char *); | |
1151 | if (!arg) | |
1152 | break; | |
1153 | nargs++; | |
83cab6e0 | 1154 | temp = realloc(args, (nargs+1) * sizeof(*args)); |
41670788 SH |
1155 | if (!temp) { |
1156 | va_end(ap); | |
72d0e1cb | 1157 | goto out; |
41670788 | 1158 | } |
72d0e1cb SG |
1159 | args = temp; |
1160 | args[nargs - 1] = arg; | |
1161 | } | |
1162 | va_end(ap); | |
63e414f8 SH |
1163 | if (args) |
1164 | args[nargs] = NULL; | |
72d0e1cb | 1165 | |
dc23c1c8 | 1166 | bret = c->create(c, t, bdevtype, specs, flags, args); |
72d0e1cb SG |
1167 | |
1168 | out: | |
1169 | if (args) | |
1170 | free(args); | |
1171 | return bret; | |
1172 | } | |
1173 | ||
12a50cc6 | 1174 | static bool lxcapi_clear_config_item(struct lxc_container *c, const char *key) |
72d0e1cb SG |
1175 | { |
1176 | int ret; | |
1177 | ||
1178 | if (!c || !c->lxc_conf) | |
1179 | return false; | |
5cee8c50 | 1180 | if (container_mem_lock(c)) |
72d0e1cb | 1181 | return false; |
72d0e1cb | 1182 | ret = lxc_clear_config_item(c->lxc_conf, key); |
5cee8c50 | 1183 | container_mem_unlock(c); |
72d0e1cb SG |
1184 | return ret == 0; |
1185 | } | |
1186 | ||
9c83a661 SG |
1187 | char** lxcapi_get_ips(struct lxc_container *c, char* interface, char* family, int scope) |
1188 | { | |
1189 | int count = 0; | |
1190 | struct ifaddrs *interfaceArray = NULL, *tempIfAddr = NULL; | |
1191 | char addressOutputBuffer[INET6_ADDRSTRLEN]; | |
1192 | void *tempAddrPtr = NULL; | |
1193 | char **addresses = NULL, **temp; | |
1194 | char *address = NULL; | |
1195 | char new_netns_path[MAXPATHLEN]; | |
1196 | int old_netns = -1, new_netns = -1, ret = 0; | |
1197 | ||
1198 | if (!c->is_running(c)) | |
1199 | goto out; | |
1200 | ||
1201 | /* Save reference to old netns */ | |
1202 | old_netns = open("/proc/self/ns/net", O_RDONLY); | |
1203 | if (old_netns < 0) { | |
1204 | SYSERROR("failed to open /proc/self/ns/net"); | |
1205 | goto out; | |
1206 | } | |
1207 | ||
1208 | /* Switch to new netns */ | |
1209 | ret = snprintf(new_netns_path, MAXPATHLEN, "/proc/%d/ns/net", c->init_pid(c)); | |
1210 | if (ret < 0 || ret >= MAXPATHLEN) | |
1211 | goto out; | |
1212 | ||
1213 | new_netns = open(new_netns_path, O_RDONLY); | |
1214 | if (new_netns < 0) { | |
1215 | SYSERROR("failed to open %s", new_netns_path); | |
1216 | goto out; | |
1217 | } | |
1218 | ||
1219 | if (setns(new_netns, CLONE_NEWNET)) { | |
1220 | SYSERROR("failed to setns"); | |
1221 | goto out; | |
1222 | } | |
1223 | ||
1224 | /* Grab the list of interfaces */ | |
1225 | if (getifaddrs(&interfaceArray)) { | |
1226 | SYSERROR("failed to get interfaces list"); | |
1227 | goto out; | |
1228 | } | |
1229 | ||
1230 | /* Iterate through the interfaces */ | |
1231 | for (tempIfAddr = interfaceArray; tempIfAddr != NULL; tempIfAddr = tempIfAddr->ifa_next) { | |
1232 | if(tempIfAddr->ifa_addr->sa_family == AF_INET) { | |
1233 | if (family && strcmp(family, "inet")) | |
1234 | continue; | |
1235 | tempAddrPtr = &((struct sockaddr_in *)tempIfAddr->ifa_addr)->sin_addr; | |
1236 | } | |
1237 | else { | |
1238 | if (family && strcmp(family, "inet6")) | |
1239 | continue; | |
1240 | ||
1241 | if (((struct sockaddr_in6 *)tempIfAddr->ifa_addr)->sin6_scope_id != scope) | |
1242 | continue; | |
1243 | ||
1244 | tempAddrPtr = &((struct sockaddr_in6 *)tempIfAddr->ifa_addr)->sin6_addr; | |
1245 | } | |
1246 | ||
1247 | if (interface && strcmp(interface, tempIfAddr->ifa_name)) | |
1248 | continue; | |
1249 | else if (!interface && strcmp("lo", tempIfAddr->ifa_name) == 0) | |
1250 | continue; | |
1251 | ||
1252 | address = (char *)inet_ntop(tempIfAddr->ifa_addr->sa_family, | |
1253 | tempAddrPtr, | |
1254 | addressOutputBuffer, | |
1255 | sizeof(addressOutputBuffer)); | |
1256 | if (!address) | |
1257 | continue; | |
1258 | ||
1259 | count += 1; | |
1260 | temp = realloc(addresses, count * sizeof(*addresses)); | |
1261 | if (!temp) { | |
1262 | count--; | |
1263 | goto out; | |
1264 | } | |
1265 | addresses = temp; | |
1266 | addresses[count - 1] = strdup(address); | |
1267 | } | |
1268 | ||
1269 | out: | |
1270 | if(interfaceArray) | |
1271 | freeifaddrs(interfaceArray); | |
1272 | ||
1273 | /* Switch back to original netns */ | |
1274 | if (old_netns >= 0 && setns(old_netns, CLONE_NEWNET)) | |
1275 | SYSERROR("failed to setns"); | |
1276 | if (new_netns >= 0) | |
1277 | close(new_netns); | |
1278 | if (old_netns >= 0) | |
1279 | close(old_netns); | |
1280 | ||
1281 | /* Append NULL to the array */ | |
1282 | if (count) { | |
1283 | count++; | |
1284 | temp = realloc(addresses, count * sizeof(*addresses)); | |
1285 | if (!temp) { | |
fca3080f DE |
1286 | int i; |
1287 | for (i = 0; i < count-1; i++) | |
9c83a661 SG |
1288 | free(addresses[i]); |
1289 | free(addresses); | |
1290 | return NULL; | |
1291 | } | |
1292 | addresses = temp; | |
1293 | addresses[count - 1] = NULL; | |
1294 | } | |
1295 | ||
1296 | return addresses; | |
1297 | } | |
1298 | ||
12a50cc6 | 1299 | static int lxcapi_get_config_item(struct lxc_container *c, const char *key, char *retv, int inlen) |
72d0e1cb SG |
1300 | { |
1301 | int ret; | |
1302 | ||
1303 | if (!c || !c->lxc_conf) | |
1304 | return -1; | |
5cee8c50 | 1305 | if (container_mem_lock(c)) |
72d0e1cb | 1306 | return -1; |
72d0e1cb | 1307 | ret = lxc_get_config_item(c->lxc_conf, key, retv, inlen); |
5cee8c50 | 1308 | container_mem_unlock(c); |
72d0e1cb SG |
1309 | return ret; |
1310 | } | |
1311 | ||
12a50cc6 | 1312 | static int lxcapi_get_keys(struct lxc_container *c, const char *key, char *retv, int inlen) |
72d0e1cb SG |
1313 | { |
1314 | if (!key) | |
1315 | return lxc_listconfigs(retv, inlen); | |
1316 | /* | |
1317 | * Support 'lxc.network.<idx>', i.e. 'lxc.network.0' | |
1318 | * This is an intelligent result to show which keys are valid given | |
1319 | * the type of nic it is | |
1320 | */ | |
1321 | if (!c || !c->lxc_conf) | |
1322 | return -1; | |
5cee8c50 | 1323 | if (container_mem_lock(c)) |
72d0e1cb SG |
1324 | return -1; |
1325 | int ret = -1; | |
1326 | if (strncmp(key, "lxc.network.", 12) == 0) | |
1327 | ret = lxc_list_nicconfigs(c->lxc_conf, key, retv, inlen); | |
5cee8c50 | 1328 | container_mem_unlock(c); |
72d0e1cb SG |
1329 | return ret; |
1330 | } | |
1331 | ||
12a50cc6 | 1332 | static bool lxcapi_save_config(struct lxc_container *c, const char *alt_file) |
72d0e1cb | 1333 | { |
39dc698c SH |
1334 | FILE *fout; |
1335 | bool ret = false, need_disklock = false; | |
1336 | int lret; | |
1337 | ||
72d0e1cb SG |
1338 | if (!alt_file) |
1339 | alt_file = c->configfile; | |
1340 | if (!alt_file) | |
1341 | return false; // should we write to stdout if no file is specified? | |
39dc698c SH |
1342 | |
1343 | // If we haven't yet loaded a config, load the stock config | |
1344 | if (!c->lxc_conf) { | |
72d0e1cb SG |
1345 | if (!c->load_config(c, LXC_DEFAULT_CONFIG)) { |
1346 | ERROR("Error loading default configuration file %s while saving %s\n", LXC_DEFAULT_CONFIG, c->name); | |
1347 | return false; | |
1348 | } | |
39dc698c | 1349 | } |
72d0e1cb | 1350 | |
5a3d2e1e SG |
1351 | if (!create_container_dir(c)) |
1352 | return false; | |
1353 | ||
39dc698c SH |
1354 | /* |
1355 | * If we're writing to the container's config file, take the | |
1356 | * disk lock. Otherwise just take the memlock to protect the | |
1357 | * struct lxc_container while we're traversing it. | |
1358 | */ | |
1359 | if (strcmp(c->configfile, alt_file) == 0) | |
1360 | need_disklock = true; | |
1361 | ||
1362 | if (need_disklock) | |
1363 | lret = container_disk_lock(c); | |
1364 | else | |
1365 | lret = container_mem_lock(c); | |
1366 | ||
1367 | if (lret) | |
72d0e1cb | 1368 | return false; |
39dc698c SH |
1369 | |
1370 | fout = fopen(alt_file, "w"); | |
1371 | if (!fout) | |
1372 | goto out; | |
72d0e1cb SG |
1373 | write_config(fout, c->lxc_conf); |
1374 | fclose(fout); | |
39dc698c SH |
1375 | ret = true; |
1376 | ||
1377 | out: | |
1378 | if (need_disklock) | |
1379 | container_disk_unlock(c); | |
1380 | else | |
1381 | container_mem_unlock(c); | |
1382 | return ret; | |
72d0e1cb SG |
1383 | } |
1384 | ||
60bf62d4 | 1385 | // do we want the api to support --force, or leave that to the caller? |
72d0e1cb SG |
1386 | static bool lxcapi_destroy(struct lxc_container *c) |
1387 | { | |
1897e3bc | 1388 | struct bdev *r = NULL; |
60bf62d4 | 1389 | bool ret = false; |
72d0e1cb | 1390 | |
1897e3bc | 1391 | if (!c || !lxcapi_is_defined(c)) |
5a3d2e1e SG |
1392 | return false; |
1393 | ||
3bc449ed | 1394 | if (container_disk_lock(c)) |
72d0e1cb | 1395 | return false; |
72d0e1cb | 1396 | |
39dc698c | 1397 | if (!is_stopped(c)) { |
60bf62d4 SH |
1398 | // we should queue some sort of error - in c->error_string? |
1399 | ERROR("container %s is not stopped", c->name); | |
1400 | goto out; | |
72d0e1cb SG |
1401 | } |
1402 | ||
3bc449ed | 1403 | if (c->lxc_conf && c->lxc_conf->rootfs.path && c->lxc_conf->rootfs.mount) |
1897e3bc | 1404 | r = bdev_init(c->lxc_conf->rootfs.path, c->lxc_conf->rootfs.mount, NULL); |
60bf62d4 SH |
1405 | if (r) { |
1406 | if (r->ops->destroy(r) < 0) { | |
1407 | ERROR("Error destroying rootfs for %s", c->name); | |
1408 | goto out; | |
1409 | } | |
1410 | } | |
1411 | ||
1412 | const char *p1 = lxcapi_get_config_path(c); | |
1413 | char *path = alloca(strlen(p1) + strlen(c->name) + 2); | |
1414 | sprintf(path, "%s/%s", p1, c->name); | |
1415 | if (lxc_rmdir_onedev(path) < 0) { | |
1416 | ERROR("Error destroying container directory for %s", c->name); | |
1417 | goto out; | |
1418 | } | |
1419 | ret = true; | |
1420 | ||
1421 | out: | |
3bc449ed | 1422 | container_disk_unlock(c); |
60bf62d4 | 1423 | return ret; |
72d0e1cb SG |
1424 | } |
1425 | ||
12a50cc6 | 1426 | static bool lxcapi_set_config_item(struct lxc_container *c, const char *key, const char *v) |
72d0e1cb SG |
1427 | { |
1428 | int ret; | |
1429 | bool b = false; | |
1430 | struct lxc_config_t *config; | |
1431 | ||
1432 | if (!c) | |
1433 | return false; | |
1434 | ||
5cee8c50 | 1435 | if (container_mem_lock(c)) |
72d0e1cb SG |
1436 | return false; |
1437 | ||
1438 | if (!c->lxc_conf) | |
1439 | c->lxc_conf = lxc_conf_init(); | |
1440 | if (!c->lxc_conf) | |
1441 | goto err; | |
1442 | config = lxc_getconfig(key); | |
1443 | if (!config) | |
1444 | goto err; | |
1445 | ret = config->cb(key, v, c->lxc_conf); | |
1446 | if (!ret) | |
1447 | b = true; | |
1448 | ||
1449 | err: | |
5cee8c50 | 1450 | container_mem_unlock(c); |
72d0e1cb SG |
1451 | return b; |
1452 | } | |
1453 | ||
1454 | static char *lxcapi_config_file_name(struct lxc_container *c) | |
1455 | { | |
1456 | if (!c || !c->configfile) | |
1457 | return NULL; | |
1458 | return strdup(c->configfile); | |
1459 | } | |
1460 | ||
2a59a681 SH |
1461 | static const char *lxcapi_get_config_path(struct lxc_container *c) |
1462 | { | |
1463 | if (!c || !c->config_path) | |
1464 | return NULL; | |
1465 | return (const char *)(c->config_path); | |
1466 | } | |
1467 | ||
afeecbba SH |
1468 | /* |
1469 | * not for export | |
1470 | * Just recalculate the c->configfile based on the | |
1471 | * c->config_path, which must be set. | |
1472 | * The lxc_container must be locked or not yet public. | |
1473 | */ | |
1474 | static bool set_config_filename(struct lxc_container *c) | |
1475 | { | |
1476 | char *newpath; | |
1477 | int len, ret; | |
1478 | ||
1479 | if (!c->config_path) | |
1480 | return false; | |
1481 | ||
1482 | /* $lxc_path + "/" + c->name + "/" + "config" + '\0' */ | |
1483 | len = strlen(c->config_path) + strlen(c->name) + strlen("config") + 3; | |
1484 | newpath = malloc(len); | |
1485 | if (!newpath) | |
1486 | return false; | |
1487 | ||
1488 | ret = snprintf(newpath, len, "%s/%s/config", c->config_path, c->name); | |
1489 | if (ret < 0 || ret >= len) { | |
1490 | fprintf(stderr, "Error printing out config file name\n"); | |
1491 | free(newpath); | |
1492 | return false; | |
1493 | } | |
1494 | ||
1495 | if (c->configfile) | |
1496 | free(c->configfile); | |
1497 | c->configfile = newpath; | |
1498 | ||
1499 | return true; | |
1500 | } | |
1501 | ||
2a59a681 SH |
1502 | static bool lxcapi_set_config_path(struct lxc_container *c, const char *path) |
1503 | { | |
1504 | char *p; | |
1505 | bool b = false; | |
afeecbba | 1506 | char *oldpath = NULL; |
2a59a681 SH |
1507 | |
1508 | if (!c) | |
1509 | return b; | |
1510 | ||
5cee8c50 | 1511 | if (container_mem_lock(c)) |
2a59a681 SH |
1512 | return b; |
1513 | ||
1514 | p = strdup(path); | |
afeecbba SH |
1515 | if (!p) { |
1516 | ERROR("Out of memory setting new lxc path"); | |
2a59a681 | 1517 | goto err; |
afeecbba SH |
1518 | } |
1519 | ||
2a59a681 SH |
1520 | b = true; |
1521 | if (c->config_path) | |
afeecbba | 1522 | oldpath = c->config_path; |
2a59a681 | 1523 | c->config_path = p; |
afeecbba SH |
1524 | |
1525 | /* Since we've changed the config path, we have to change the | |
1526 | * config file name too */ | |
1527 | if (!set_config_filename(c)) { | |
1528 | ERROR("Out of memory setting new config filename"); | |
1529 | b = false; | |
1530 | free(c->config_path); | |
1531 | c->config_path = oldpath; | |
1532 | oldpath = NULL; | |
1533 | } | |
2a59a681 | 1534 | err: |
afeecbba SH |
1535 | if (oldpath) |
1536 | free(oldpath); | |
5cee8c50 | 1537 | container_mem_unlock(c); |
2a59a681 SH |
1538 | return b; |
1539 | } | |
1540 | ||
1541 | ||
794dd120 SH |
1542 | static bool lxcapi_set_cgroup_item(struct lxc_container *c, const char *subsys, const char *value) |
1543 | { | |
1544 | int ret; | |
794dd120 SH |
1545 | |
1546 | if (!c) | |
1547 | return false; | |
1548 | ||
3bc449ed | 1549 | if (is_stopped(c)) |
794dd120 SH |
1550 | return false; |
1551 | ||
3bc449ed SH |
1552 | if (container_disk_lock(c)) |
1553 | return false; | |
794dd120 | 1554 | |
ef091cef | 1555 | ret = lxc_cgroup_set(c->name, subsys, value, c->config_path); |
3bc449ed SH |
1556 | |
1557 | container_disk_unlock(c); | |
1558 | return ret == 0; | |
794dd120 SH |
1559 | } |
1560 | ||
1561 | static int lxcapi_get_cgroup_item(struct lxc_container *c, const char *subsys, char *retv, int inlen) | |
1562 | { | |
3bc449ed | 1563 | int ret; |
794dd120 SH |
1564 | |
1565 | if (!c || !c->lxc_conf) | |
1566 | return -1; | |
1567 | ||
3bc449ed | 1568 | if (is_stopped(c)) |
794dd120 SH |
1569 | return -1; |
1570 | ||
3bc449ed SH |
1571 | if (container_disk_lock(c)) |
1572 | return -1; | |
794dd120 | 1573 | |
ae5c8b8e | 1574 | ret = lxc_cgroup_get(c->name, subsys, retv, inlen, c->config_path); |
794dd120 | 1575 | |
3bc449ed | 1576 | container_disk_unlock(c); |
794dd120 SH |
1577 | return ret; |
1578 | } | |
1579 | ||
67e571de | 1580 | const char *lxc_get_default_config_path(void) |
83c98d82 DE |
1581 | { |
1582 | return default_lxc_path(); | |
1583 | } | |
794dd120 | 1584 | |
a8428dfa SH |
1585 | const char *lxc_get_default_lvm_vg(void) |
1586 | { | |
1587 | return default_lvm_vg(); | |
1588 | } | |
1589 | ||
1590 | const char *lxc_get_default_zfs_root(void) | |
1591 | { | |
1592 | return default_zfs_root(); | |
1593 | } | |
1594 | ||
b6b918a1 SG |
1595 | const char *lxc_get_version(void) |
1596 | { | |
1597 | return lxc_version(); | |
1598 | } | |
1599 | ||
9be53773 SH |
1600 | static int copy_file(char *old, char *new) |
1601 | { | |
1602 | int in, out; | |
1603 | ssize_t len, ret; | |
1604 | char buf[8096]; | |
1605 | struct stat sbuf; | |
1606 | ||
1607 | if (file_exists(new)) { | |
1608 | ERROR("copy destination %s exists", new); | |
1609 | return -1; | |
1610 | } | |
1611 | ret = stat(old, &sbuf); | |
1612 | if (ret < 0) { | |
1613 | SYSERROR("stat'ing %s", old); | |
1614 | return -1; | |
1615 | } | |
1616 | ||
1617 | in = open(old, O_RDONLY); | |
1618 | if (in < 0) { | |
1619 | SYSERROR("opening original file %s", old); | |
1620 | return -1; | |
1621 | } | |
1622 | out = open(new, O_CREAT | O_EXCL | O_WRONLY, 0644); | |
1623 | if (out < 0) { | |
1624 | SYSERROR("opening new file %s", new); | |
1625 | close(in); | |
1626 | return -1; | |
1627 | } | |
1628 | ||
1629 | while (1) { | |
1630 | len = read(in, buf, 8096); | |
1631 | if (len < 0) { | |
1632 | SYSERROR("reading old file %s", old); | |
1633 | goto err; | |
1634 | } | |
1635 | if (len == 0) | |
1636 | break; | |
1637 | ret = write(out, buf, len); | |
1638 | if (ret < len) { // should we retry? | |
1639 | SYSERROR("write to new file %s was interrupted", new); | |
1640 | goto err; | |
1641 | } | |
1642 | } | |
1643 | close(in); | |
1644 | close(out); | |
1645 | ||
1646 | // we set mode, but not owner/group | |
1647 | ret = chmod(new, sbuf.st_mode); | |
1648 | if (ret) { | |
1649 | SYSERROR("setting mode on %s", new); | |
1650 | return -1; | |
1651 | } | |
1652 | ||
1653 | return 0; | |
1654 | ||
1655 | err: | |
1656 | close(in); | |
1657 | close(out); | |
1658 | return -1; | |
1659 | } | |
1660 | ||
1661 | /* | |
1662 | * we're being passed result of two strstrs(x, y). We want to write | |
1663 | * all data up to the first found string, or to end of the string if | |
1664 | * neither string was found. | |
1665 | * This function will return the earliest found string if any, or else | |
1666 | * NULL | |
1667 | */ | |
1668 | static const char *lowest_nonnull(const char *p1, const char *p2) | |
1669 | { | |
1670 | if (!p1) | |
1671 | return p2; | |
1672 | if (!p2) | |
1673 | return p1; | |
1674 | return p1 < p2 ? p1 : p2; | |
1675 | } | |
1676 | ||
1677 | static int is_word_sep(char c) | |
1678 | { | |
1679 | switch(c) { | |
1680 | case '\0': | |
1681 | case '\n': | |
1682 | case '\r': | |
1683 | case '\t': | |
1684 | case ' ': | |
1685 | case '=': | |
ae3f8cf9 SH |
1686 | case '.': |
1687 | case ',': | |
1688 | case '_': | |
1689 | case '-': | |
9be53773 SH |
1690 | case '/': |
1691 | return 1; | |
1692 | default: return 0; | |
1693 | } | |
1694 | } | |
1695 | ||
3327917f | 1696 | static const char *find_first_wholeword(const char *p0, const char *word) |
9be53773 | 1697 | { |
3327917f DE |
1698 | const char *p = p0; |
1699 | ||
9be53773 SH |
1700 | if (!p) |
1701 | return NULL; | |
1702 | ||
1703 | while ((p = strstr(p, word)) != NULL) { | |
3327917f DE |
1704 | if ((p == p0 || is_word_sep(*(p-1))) && |
1705 | is_word_sep(p[strlen(word)])) | |
9be53773 SH |
1706 | return p; |
1707 | p++; | |
1708 | } | |
1709 | return NULL; | |
1710 | } | |
1711 | ||
1712 | static int update_name_and_paths(const char *path, struct lxc_container *oldc, | |
1713 | const char *newname, const char *newpath) | |
1714 | { | |
1715 | FILE *f; | |
a7478944 | 1716 | long flen; |
9be53773 SH |
1717 | char *contents; |
1718 | const char *p0, *p1, *p2, *end; | |
1719 | const char *oldpath = oldc->get_config_path(oldc); | |
1720 | const char *oldname = oldc->name; | |
1721 | ||
1722 | f = fopen(path, "r"); | |
1723 | if (!f) { | |
1724 | SYSERROR("opening old config"); | |
1725 | return -1; | |
1726 | } | |
1727 | if (fseek(f, 0, SEEK_END) < 0) { | |
1728 | SYSERROR("seeking to end of old config"); | |
1729 | fclose(f); | |
1730 | return -1; | |
1731 | } | |
1732 | flen = ftell(f); | |
1733 | if (flen < 0) { | |
9be53773 | 1734 | SYSERROR("telling size of old config"); |
3ce74686 | 1735 | fclose(f); |
9be53773 SH |
1736 | return -1; |
1737 | } | |
1738 | if (fseek(f, 0, SEEK_SET) < 0) { | |
9be53773 | 1739 | SYSERROR("rewinding old config"); |
3ce74686 | 1740 | fclose(f); |
9be53773 SH |
1741 | return -1; |
1742 | } | |
a2eea3c1 | 1743 | contents = malloc(flen+1); |
9be53773 SH |
1744 | if (!contents) { |
1745 | SYSERROR("out of memory"); | |
1746 | fclose(f); | |
a2eea3c1 | 1747 | return -1; |
9be53773 SH |
1748 | } |
1749 | if (fread(contents, 1, flen, f) != flen) { | |
3ce74686 | 1750 | SYSERROR("reading old config"); |
9be53773 SH |
1751 | free(contents); |
1752 | fclose(f); | |
9be53773 SH |
1753 | return -1; |
1754 | } | |
a2eea3c1 | 1755 | contents[flen] = '\0'; |
9be53773 | 1756 | if (fclose(f) < 0) { |
9be53773 | 1757 | SYSERROR("closing old config"); |
3ce74686 | 1758 | free(contents); |
9be53773 SH |
1759 | return -1; |
1760 | } | |
1761 | ||
1762 | f = fopen(path, "w"); | |
1763 | if (!f) { | |
1764 | SYSERROR("reopening config"); | |
1765 | free(contents); | |
1766 | return -1; | |
1767 | } | |
1768 | ||
1769 | p0 = contents; | |
1770 | end = contents + flen; | |
1771 | while (1) { | |
1772 | p1 = find_first_wholeword(p0, oldpath); | |
1773 | p2 = find_first_wholeword(p0, oldname); | |
1774 | if (!p1 && !p2) { | |
1775 | // write the rest and be done | |
1776 | if (fwrite(p0, 1, (end-p0), f) != (end-p0)) { | |
1777 | SYSERROR("writing new config"); | |
1778 | free(contents); | |
1779 | fclose(f); | |
1780 | return -1; | |
1781 | } | |
1782 | free(contents); | |
1783 | fclose(f); | |
1784 | // success | |
1785 | return 0; | |
1786 | } else { | |
1787 | const char *p = lowest_nonnull(p1, p2); | |
1788 | const char *new = (p == p2) ? newname : newpath; | |
1789 | if (fwrite(p0, 1, (p-p0), f) != (p-p0)) { | |
1790 | SYSERROR("writing new config"); | |
1791 | free(contents); | |
1792 | fclose(f); | |
1793 | return -1; | |
1794 | } | |
1795 | p0 = p; | |
1796 | // now write the newpath or newname | |
1797 | if (fwrite(new, 1, strlen(new), f) != strlen(new)) { | |
1798 | SYSERROR("writing new name or path in new config"); | |
1799 | free(contents); | |
1800 | fclose(f); | |
1801 | return -1; | |
1802 | } | |
1803 | p0 += (p == p2) ? strlen(oldname) : strlen(oldpath); | |
1804 | } | |
1805 | } | |
1806 | } | |
1807 | ||
1808 | static int copyhooks(struct lxc_container *oldc, struct lxc_container *c) | |
1809 | { | |
1810 | int i; | |
1811 | int ret; | |
1812 | struct lxc_list *it; | |
1813 | ||
1814 | for (i=0; i<NUM_LXC_HOOKS; i++) { | |
1815 | lxc_list_for_each(it, &c->lxc_conf->hooks[i]) { | |
1816 | char *hookname = it->elem; | |
1817 | char *fname = rindex(hookname, '/'); | |
1818 | char tmppath[MAXPATHLEN]; | |
1819 | if (!fname) // relative path - we don't support, but maybe we should | |
1820 | return 0; | |
1821 | // copy the script, and change the entry in confile | |
1822 | ret = snprintf(tmppath, MAXPATHLEN, "%s/%s/%s", | |
1823 | c->config_path, c->name, fname+1); | |
1824 | if (ret < 0 || ret >= MAXPATHLEN) | |
1825 | return -1; | |
1826 | ret = copy_file(it->elem, tmppath); | |
1827 | if (ret < 0) | |
1828 | return -1; | |
1829 | free(it->elem); | |
1830 | it->elem = strdup(tmppath); | |
1831 | if (!it->elem) { | |
1832 | ERROR("out of memory copying hook path"); | |
1833 | return -1; | |
1834 | } | |
1835 | update_name_and_paths(it->elem, oldc, c->name, c->get_config_path(c)); | |
1836 | } | |
1837 | } | |
1838 | ||
1839 | c->save_config(c, NULL); | |
1840 | return 0; | |
1841 | } | |
1842 | ||
1843 | static void new_hwaddr(char *hwaddr) | |
1844 | { | |
1845 | FILE *f = fopen("/dev/urandom", "r"); | |
1846 | if (f) { | |
1847 | unsigned int seed; | |
1848 | int ret = fread(&seed, sizeof(seed), 1, f); | |
1849 | if (ret != 1) | |
1850 | seed = time(NULL); | |
1851 | fclose(f); | |
1852 | srand(seed); | |
1853 | } else | |
1854 | srand(time(NULL)); | |
1855 | snprintf(hwaddr, 18, "00:16:3e:%02x:%02x:%02x", | |
1856 | rand() % 255, rand() % 255, rand() % 255); | |
1857 | } | |
1858 | ||
1859 | static void network_new_hwaddrs(struct lxc_container *c) | |
1860 | { | |
1861 | struct lxc_list *it; | |
1862 | ||
1863 | lxc_list_for_each(it, &c->lxc_conf->network) { | |
1864 | struct lxc_netdev *n = it->elem; | |
1865 | if (n->hwaddr) | |
1866 | new_hwaddr(n->hwaddr); | |
1867 | } | |
1868 | } | |
1869 | ||
1870 | static int copy_fstab(struct lxc_container *oldc, struct lxc_container *c) | |
1871 | { | |
1872 | char newpath[MAXPATHLEN]; | |
1873 | char *oldpath = oldc->lxc_conf->fstab; | |
1874 | int ret; | |
1875 | ||
1876 | if (!oldpath) | |
1877 | return 0; | |
1878 | ||
1879 | char *p = rindex(oldpath, '/'); | |
1880 | if (!p) | |
1881 | return -1; | |
1882 | ret = snprintf(newpath, MAXPATHLEN, "%s/%s%s", | |
1883 | c->config_path, c->name, p); | |
1884 | if (ret < 0 || ret >= MAXPATHLEN) { | |
1885 | ERROR("error printing new path for %s", oldpath); | |
1886 | return -1; | |
1887 | } | |
1888 | if (file_exists(newpath)) { | |
1889 | ERROR("error: fstab file %s exists", newpath); | |
1890 | return -1; | |
1891 | } | |
1892 | ||
1893 | if (copy_file(oldpath, newpath) < 0) { | |
1894 | ERROR("error: copying %s to %s", oldpath, newpath); | |
1895 | return -1; | |
1896 | } | |
1897 | free(c->lxc_conf->fstab); | |
1898 | c->lxc_conf->fstab = strdup(newpath); | |
1899 | if (!c->lxc_conf->fstab) { | |
1900 | ERROR("error: allocating pathname"); | |
1901 | return -1; | |
1902 | } | |
1903 | ||
1904 | return 0; | |
1905 | } | |
1906 | ||
1907 | static int copy_storage(struct lxc_container *c0, struct lxc_container *c, | |
1908 | const char *newtype, int flags, const char *bdevdata, unsigned long newsize) | |
1909 | { | |
1910 | struct bdev *bdev; | |
1911 | ||
1912 | bdev = bdev_copy(c0->lxc_conf->rootfs.path, c0->name, c->name, | |
1913 | c0->config_path, c->config_path, newtype, !!(flags & LXC_CLONE_SNAPSHOT), | |
1914 | bdevdata, newsize); | |
1915 | if (!bdev) { | |
1916 | ERROR("error copying storage"); | |
1917 | return -1; | |
1918 | } | |
1919 | free(c->lxc_conf->rootfs.path); | |
1920 | c->lxc_conf->rootfs.path = strdup(bdev->src); | |
1921 | bdev_put(bdev); | |
1922 | if (!c->lxc_conf->rootfs.path) | |
1923 | return -1; | |
1924 | // here we could also update all lxc.mount.entries or even | |
1925 | // items in the lxc.mount fstab list. As discussed on m-l, | |
1926 | // we could do either any source paths starting with the | |
1927 | // lxcpath/oldname, or simply anythign which is not a virtual | |
1928 | // fs or a bind mount. | |
1929 | return 0; | |
1930 | } | |
1931 | ||
1143ed39 DE |
1932 | static int clone_update_rootfs(struct lxc_container *c0, |
1933 | struct lxc_container *c, int flags, | |
1934 | char **hookargs) | |
9be53773 SH |
1935 | { |
1936 | int ret = -1; | |
1937 | char path[MAXPATHLEN]; | |
1938 | struct bdev *bdev; | |
1939 | FILE *fout; | |
1940 | pid_t pid; | |
148e91f5 | 1941 | struct lxc_conf *conf = c->lxc_conf; |
9be53773 SH |
1942 | |
1943 | /* update hostname in rootfs */ | |
1944 | /* we're going to mount, so run in a clean namespace to simplify cleanup */ | |
1945 | ||
1946 | pid = fork(); | |
1947 | if (pid < 0) | |
1948 | return -1; | |
1949 | if (pid > 0) | |
1950 | return wait_for_pid(pid); | |
1951 | ||
1952 | if (unshare(CLONE_NEWNS) < 0) { | |
1953 | ERROR("error unsharing mounts"); | |
1954 | exit(1); | |
1955 | } | |
1956 | bdev = bdev_init(c->lxc_conf->rootfs.path, c->lxc_conf->rootfs.mount, NULL); | |
1957 | if (!bdev) | |
1958 | exit(1); | |
1959 | if (bdev->ops->mount(bdev) < 0) | |
1960 | exit(1); | |
148e91f5 SH |
1961 | |
1962 | if (!lxc_list_empty(&conf->hooks[LXCHOOK_CLONE])) { | |
1963 | /* Start of environment variable setup for hooks */ | |
1143ed39 DE |
1964 | if (setenv("LXC_SRC_NAME", c0->name, 1)) { |
1965 | SYSERROR("failed to set environment variable for source container name"); | |
1966 | } | |
148e91f5 SH |
1967 | if (setenv("LXC_NAME", c->name, 1)) { |
1968 | SYSERROR("failed to set environment variable for container name"); | |
1969 | } | |
1970 | if (setenv("LXC_CONFIG_FILE", conf->rcfile, 1)) { | |
1971 | SYSERROR("failed to set environment variable for config path"); | |
1972 | } | |
1973 | if (setenv("LXC_ROOTFS_MOUNT", conf->rootfs.mount, 1)) { | |
1974 | SYSERROR("failed to set environment variable for rootfs mount"); | |
1975 | } | |
1976 | if (setenv("LXC_ROOTFS_PATH", conf->rootfs.path, 1)) { | |
1977 | SYSERROR("failed to set environment variable for rootfs mount"); | |
1978 | } | |
1979 | ||
283678ed | 1980 | if (run_lxc_hooks(c->name, "clone", conf, c->get_config_path(c), hookargs)) { |
148e91f5 SH |
1981 | ERROR("Error executing clone hook for %s", c->name); |
1982 | exit(1); | |
1983 | } | |
1984 | } | |
1985 | ||
1986 | if (!(flags & LXC_CLONE_KEEPNAME)) { | |
1987 | ret = snprintf(path, MAXPATHLEN, "%s/etc/hostname", bdev->dest); | |
1988 | if (ret < 0 || ret >= MAXPATHLEN) | |
1989 | exit(1); | |
1990 | if (!(fout = fopen(path, "w"))) { | |
1991 | SYSERROR("unable to open %s: ignoring\n", path); | |
1992 | exit(0); | |
1993 | } | |
1994 | if (fprintf(fout, "%s", c->name) < 0) | |
1995 | exit(1); | |
1996 | if (fclose(fout) < 0) | |
1997 | exit(1); | |
9be53773 | 1998 | } |
9be53773 SH |
1999 | exit(0); |
2000 | } | |
2001 | ||
2002 | /* | |
2003 | * We want to support: | |
2004 | sudo lxc-clone -o o1 -n n1 -s -L|-fssize fssize -v|--vgname vgname \ | |
2005 | -p|--lvprefix lvprefix -t|--fstype fstype -B backingstore | |
2006 | ||
2007 | -s [ implies overlayfs] | |
2008 | -s -B overlayfs | |
2009 | -s -B aufs | |
2010 | ||
2011 | only rootfs gets converted (copied/snapshotted) on clone. | |
2012 | */ | |
2013 | ||
2014 | static int create_file_dirname(char *path) | |
2015 | { | |
2016 | char *p = rindex(path, '/'); | |
2017 | int ret; | |
2018 | ||
2019 | if (!p) | |
2020 | return -1; | |
2021 | *p = '\0'; | |
2022 | ret = mkdir(path, 0755); | |
2023 | if (ret && errno != EEXIST) | |
2024 | SYSERROR("creating container path %s\n", path); | |
2025 | *p = '/'; | |
2026 | return ret; | |
2027 | } | |
2028 | ||
2029 | struct lxc_container *lxcapi_clone(struct lxc_container *c, const char *newname, | |
2030 | const char *lxcpath, int flags, | |
148e91f5 SH |
2031 | const char *bdevtype, const char *bdevdata, unsigned long newsize, |
2032 | char **hookargs) | |
9be53773 SH |
2033 | { |
2034 | struct lxc_container *c2 = NULL; | |
2035 | char newpath[MAXPATHLEN]; | |
176d9acb | 2036 | int ret, storage_copied = 0; |
9be53773 SH |
2037 | const char *n, *l; |
2038 | FILE *fout; | |
2039 | ||
2040 | if (!c || !c->is_defined(c)) | |
2041 | return NULL; | |
2042 | ||
5cee8c50 | 2043 | if (container_mem_lock(c)) |
9be53773 SH |
2044 | return NULL; |
2045 | ||
39dc698c | 2046 | if (!is_stopped(c)) { |
9be53773 SH |
2047 | ERROR("error: Original container (%s) is running", c->name); |
2048 | goto out; | |
2049 | } | |
2050 | ||
2051 | // Make sure the container doesn't yet exist. | |
2052 | n = newname ? newname : c->name; | |
2053 | l = lxcpath ? lxcpath : c->get_config_path(c); | |
2054 | ret = snprintf(newpath, MAXPATHLEN, "%s/%s/config", l, n); | |
2055 | if (ret < 0 || ret >= MAXPATHLEN) { | |
2056 | SYSERROR("clone: failed making config pathname"); | |
2057 | goto out; | |
2058 | } | |
2059 | if (file_exists(newpath)) { | |
2060 | ERROR("error: clone: %s exists", newpath); | |
2061 | goto out; | |
2062 | } | |
2063 | ||
2064 | if (create_file_dirname(newpath) < 0) { | |
2065 | ERROR("Error creating container dir for %s", newpath); | |
2066 | goto out; | |
2067 | } | |
2068 | ||
2069 | // copy the configuration, tweak it as needed, | |
2070 | fout = fopen(newpath, "w"); | |
2071 | if (!fout) { | |
2072 | SYSERROR("open %s", newpath); | |
2073 | goto out; | |
2074 | } | |
2075 | write_config(fout, c->lxc_conf); | |
2076 | fclose(fout); | |
2077 | ||
2078 | if (update_name_and_paths(newpath, c, n, l) < 0) { | |
2079 | ERROR("Error updating name in cloned config"); | |
2080 | goto out; | |
2081 | } | |
2082 | ||
2083 | sprintf(newpath, "%s/%s/rootfs", l, n); | |
2084 | if (mkdir(newpath, 0755) < 0) { | |
2085 | SYSERROR("error creating %s", newpath); | |
2086 | goto out; | |
2087 | } | |
2088 | ||
2089 | c2 = lxc_container_new(n, l); | |
375c2258 | 2090 | if (!c2) { |
9be53773 SH |
2091 | ERROR("clone: failed to create new container (%s %s)", n, l); |
2092 | goto out; | |
2093 | } | |
2094 | ||
2095 | // copy hooks if requested | |
2096 | if (flags & LXC_CLONE_COPYHOOKS) { | |
2097 | ret = copyhooks(c, c2); | |
2098 | if (ret < 0) { | |
2099 | ERROR("error copying hooks"); | |
9be53773 SH |
2100 | goto out; |
2101 | } | |
2102 | } | |
2103 | ||
2104 | if (copy_fstab(c, c2) < 0) { | |
2105 | ERROR("error copying fstab"); | |
9be53773 SH |
2106 | goto out; |
2107 | } | |
2108 | ||
2109 | // update macaddrs | |
2110 | if (!(flags & LXC_CLONE_KEEPMACADDR)) | |
2111 | network_new_hwaddrs(c2); | |
2112 | ||
2113 | // copy/snapshot rootfs's | |
2114 | ret = copy_storage(c, c2, bdevtype, flags, bdevdata, newsize); | |
375c2258 | 2115 | if (ret < 0) |
9be53773 | 2116 | goto out; |
9be53773 | 2117 | |
176d9acb SH |
2118 | // We've now successfully created c2's storage, so clear it out if we |
2119 | // fail after this | |
2120 | storage_copied = 1; | |
2121 | ||
375c2258 | 2122 | if (!c2->save_config(c2, NULL)) |
9be53773 | 2123 | goto out; |
9be53773 | 2124 | |
1143ed39 | 2125 | if (clone_update_rootfs(c, c2, flags, hookargs) < 0) |
9be53773 | 2126 | goto out; |
9be53773 SH |
2127 | |
2128 | // TODO: update c's lxc.snapshot = count | |
5cee8c50 | 2129 | container_mem_unlock(c); |
9be53773 SH |
2130 | return c2; |
2131 | ||
2132 | out: | |
5cee8c50 | 2133 | container_mem_unlock(c); |
375c2258 | 2134 | if (c2) { |
176d9acb SH |
2135 | if (!storage_copied) |
2136 | c2->lxc_conf->rootfs.path = NULL; | |
375c2258 | 2137 | c2->destroy(c2); |
9be53773 | 2138 | lxc_container_put(c2); |
375c2258 | 2139 | } |
9be53773 SH |
2140 | |
2141 | return NULL; | |
2142 | } | |
2143 | ||
afeecbba | 2144 | struct lxc_container *lxc_container_new(const char *name, const char *configpath) |
72d0e1cb SG |
2145 | { |
2146 | struct lxc_container *c; | |
72d0e1cb SG |
2147 | |
2148 | c = malloc(sizeof(*c)); | |
2149 | if (!c) { | |
2150 | fprintf(stderr, "failed to malloc lxc_container\n"); | |
2151 | return NULL; | |
2152 | } | |
2153 | memset(c, 0, sizeof(*c)); | |
2154 | ||
afeecbba SH |
2155 | if (configpath) |
2156 | c->config_path = strdup(configpath); | |
2157 | else | |
67e571de | 2158 | c->config_path = strdup(default_lxc_path()); |
afeecbba | 2159 | |
2a59a681 SH |
2160 | if (!c->config_path) { |
2161 | fprintf(stderr, "Out of memory"); | |
2162 | goto err; | |
2163 | } | |
2164 | ||
72d0e1cb SG |
2165 | c->name = malloc(strlen(name)+1); |
2166 | if (!c->name) { | |
2167 | fprintf(stderr, "Error allocating lxc_container name\n"); | |
2168 | goto err; | |
2169 | } | |
2170 | strcpy(c->name, name); | |
2171 | ||
2172 | c->numthreads = 1; | |
df271a59 | 2173 | if (!(c->slock = lxc_newlock(c->config_path, name))) { |
72d0e1cb SG |
2174 | fprintf(stderr, "failed to create lock\n"); |
2175 | goto err; | |
2176 | } | |
2177 | ||
df271a59 | 2178 | if (!(c->privlock = lxc_newlock(NULL, NULL))) { |
72d0e1cb SG |
2179 | fprintf(stderr, "failed to alloc privlock\n"); |
2180 | goto err; | |
2181 | } | |
2182 | ||
afeecbba | 2183 | if (!set_config_filename(c)) { |
72d0e1cb SG |
2184 | fprintf(stderr, "Error allocating config file pathname\n"); |
2185 | goto err; | |
2186 | } | |
72d0e1cb SG |
2187 | |
2188 | if (file_exists(c->configfile)) | |
2189 | lxcapi_load_config(c, NULL); | |
2190 | ||
3e625e2d SH |
2191 | if (ongoing_create(c) == 2) { |
2192 | ERROR("Error: %s creation was not completed", c->name); | |
1897e3bc SH |
2193 | lxcapi_destroy(c); |
2194 | lxc_conf_free(c->lxc_conf); | |
2195 | c->lxc_conf = NULL; | |
3e625e2d SH |
2196 | } |
2197 | ||
72d0e1cb SG |
2198 | // assign the member functions |
2199 | c->is_defined = lxcapi_is_defined; | |
2200 | c->state = lxcapi_state; | |
2201 | c->is_running = lxcapi_is_running; | |
2202 | c->freeze = lxcapi_freeze; | |
2203 | c->unfreeze = lxcapi_unfreeze; | |
0115f8fd | 2204 | c->console = lxcapi_console; |
b5159817 | 2205 | c->console_getfd = lxcapi_console_getfd; |
72d0e1cb SG |
2206 | c->init_pid = lxcapi_init_pid; |
2207 | c->load_config = lxcapi_load_config; | |
2208 | c->want_daemonize = lxcapi_want_daemonize; | |
2209 | c->start = lxcapi_start; | |
2210 | c->startl = lxcapi_startl; | |
2211 | c->stop = lxcapi_stop; | |
2212 | c->config_file_name = lxcapi_config_file_name; | |
2213 | c->wait = lxcapi_wait; | |
2214 | c->set_config_item = lxcapi_set_config_item; | |
2215 | c->destroy = lxcapi_destroy; | |
2216 | c->save_config = lxcapi_save_config; | |
2217 | c->get_keys = lxcapi_get_keys; | |
2218 | c->create = lxcapi_create; | |
2219 | c->createl = lxcapi_createl; | |
2220 | c->shutdown = lxcapi_shutdown; | |
3e625e2d | 2221 | c->reboot = lxcapi_reboot; |
72d0e1cb SG |
2222 | c->clear_config_item = lxcapi_clear_config_item; |
2223 | c->get_config_item = lxcapi_get_config_item; | |
794dd120 SH |
2224 | c->get_cgroup_item = lxcapi_get_cgroup_item; |
2225 | c->set_cgroup_item = lxcapi_set_cgroup_item; | |
2a59a681 SH |
2226 | c->get_config_path = lxcapi_get_config_path; |
2227 | c->set_config_path = lxcapi_set_config_path; | |
9be53773 | 2228 | c->clone = lxcapi_clone; |
9c83a661 | 2229 | c->get_ips = lxcapi_get_ips; |
72d0e1cb SG |
2230 | |
2231 | /* we'll allow the caller to update these later */ | |
ab1bf971 | 2232 | if (lxc_log_init(NULL, "none", NULL, "lxc_container", 0, c->config_path)) { |
72d0e1cb SG |
2233 | fprintf(stderr, "failed to open log\n"); |
2234 | goto err; | |
2235 | } | |
2236 | ||
72d0e1cb SG |
2237 | return c; |
2238 | ||
2239 | err: | |
2240 | lxc_container_free(c); | |
2241 | return NULL; | |
2242 | } | |
2243 | ||
4a7c7daa | 2244 | int lxc_get_wait_states(const char **states) |
72d0e1cb SG |
2245 | { |
2246 | int i; | |
2247 | ||
2248 | if (states) | |
2249 | for (i=0; i<MAX_STATE; i++) | |
2250 | states[i] = lxc_state2str(i); | |
2251 | return MAX_STATE; | |
2252 | } |