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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 |
a0e93eeb | 21 | #include <stdarg.h> |
71454076 | 22 | #include <pthread.h> |
9be53773 SH |
23 | #include <unistd.h> |
24 | #include <sys/types.h> | |
25 | #include <sys/wait.h> | |
26 | #include <errno.h> | |
93dc5327 | 27 | #include <fcntl.h> |
9be53773 SH |
28 | #include <sched.h> |
29 | #include "config.h" | |
72d0e1cb SG |
30 | #include "lxc.h" |
31 | #include "state.h" | |
32 | #include "lxccontainer.h" | |
33 | #include "conf.h" | |
72d0e1cb | 34 | #include "confile.h" |
b5159817 | 35 | #include "console.h" |
72d0e1cb SG |
36 | #include "cgroup.h" |
37 | #include "commands.h" | |
b6b918a1 | 38 | #include "version.h" |
72d0e1cb | 39 | #include "log.h" |
9be53773 | 40 | #include "bdev.h" |
6a44839f | 41 | #include "utils.h" |
a0e93eeb | 42 | #include "attach.h" |
2a59a681 | 43 | #include <lxc/utils.h> |
e51d4895 | 44 | #include <lxc/monitor.h> |
e768f9c0 | 45 | #include <lxc/namespace.h> |
9c83a661 | 46 | #include <sched.h> |
9c83a661 | 47 | #include <arpa/inet.h> |
4ba0d9af SG |
48 | |
49 | #if HAVE_IFADDRS_H | |
9c83a661 | 50 | #include <ifaddrs.h> |
4ba0d9af SG |
51 | #else |
52 | #include <../include/ifaddrs.h> | |
53 | #endif | |
72d0e1cb SG |
54 | |
55 | lxc_log_define(lxc_container, lxc); | |
56 | ||
3e625e2d SH |
57 | static bool file_exists(char *f) |
58 | { | |
59 | struct stat statbuf; | |
60 | ||
61 | return stat(f, &statbuf) == 0; | |
62 | } | |
63 | ||
64 | /* | |
65 | * A few functions to help detect when a container creation failed. | |
66 | * If a container creation was killed partway through, then trying | |
67 | * to actually start that container could harm the host. We detect | |
68 | * this by creating a 'partial' file under the container directory, | |
69 | * and keeping an advisory lock. When container creation completes, | |
70 | * we remove that file. When we load or try to start a container, if | |
71 | * we find that file, without a flock, we remove the container. | |
72 | */ | |
73 | int ongoing_create(struct lxc_container *c) | |
74 | { | |
75 | int len = strlen(c->config_path) + strlen(c->name) + 10; | |
76 | char *path = alloca(len); | |
77 | int fd, ret; | |
93dc5327 SH |
78 | struct flock lk; |
79 | ||
3e625e2d SH |
80 | ret = snprintf(path, len, "%s/%s/partial", c->config_path, c->name); |
81 | if (ret < 0 || ret >= len) { | |
82 | ERROR("Error writing partial pathname"); | |
83 | return -1; | |
84 | } | |
85 | ||
86 | if (!file_exists(path)) | |
87 | return 0; | |
88 | if (process_lock()) | |
89 | return -1; | |
90 | if ((fd = open(path, O_RDWR)) < 0) { | |
91 | // give benefit of the doubt | |
92 | SYSERROR("Error opening partial file"); | |
93 | process_unlock(); | |
94 | return 0; | |
95 | } | |
93dc5327 SH |
96 | lk.l_type = F_WRLCK; |
97 | lk.l_whence = SEEK_SET; | |
98 | lk.l_start = 0; | |
99 | lk.l_len = 0; | |
100 | lk.l_pid = -1; | |
101 | if (fcntl(fd, F_GETLK, &lk) == 0 && lk.l_pid != -1) { | |
3e625e2d SH |
102 | // create is still ongoing |
103 | close(fd); | |
104 | process_unlock(); | |
105 | return 1; | |
106 | } | |
107 | // create completed but partial is still there. | |
108 | close(fd); | |
109 | process_unlock(); | |
110 | return 2; | |
111 | } | |
112 | ||
113 | int create_partial(struct lxc_container *c) | |
114 | { | |
115 | // $lxcpath + '/' + $name + '/partial' + \0 | |
116 | int len = strlen(c->config_path) + strlen(c->name) + 10; | |
117 | char *path = alloca(len); | |
118 | int fd, ret; | |
93dc5327 SH |
119 | struct flock lk; |
120 | ||
3e625e2d SH |
121 | ret = snprintf(path, len, "%s/%s/partial", c->config_path, c->name); |
122 | if (ret < 0 || ret >= len) { | |
123 | ERROR("Error writing partial pathname"); | |
124 | return -1; | |
125 | } | |
1897e3bc | 126 | if (process_lock()) |
3e625e2d | 127 | return -1; |
93dc5327 | 128 | if ((fd=open(path, O_RDWR | O_CREAT | O_EXCL, 0755)) < 0) { |
3e625e2d SH |
129 | SYSERROR("Erorr creating partial file"); |
130 | process_unlock(); | |
131 | return -1; | |
132 | } | |
93dc5327 SH |
133 | lk.l_type = F_WRLCK; |
134 | lk.l_whence = SEEK_SET; | |
135 | lk.l_start = 0; | |
136 | lk.l_len = 0; | |
137 | if (fcntl(fd, F_SETLKW, &lk) < 0) { | |
3e625e2d SH |
138 | SYSERROR("Error locking partial file %s", path); |
139 | close(fd); | |
140 | process_unlock(); | |
141 | return -1; | |
142 | } | |
143 | process_unlock(); | |
144 | ||
145 | return fd; | |
146 | } | |
147 | ||
148 | void remove_partial(struct lxc_container *c, int fd) | |
149 | { | |
150 | // $lxcpath + '/' + $name + '/partial' + \0 | |
151 | int len = strlen(c->config_path) + strlen(c->name) + 10; | |
152 | char *path = alloca(len); | |
153 | int ret; | |
154 | ||
155 | close(fd); | |
156 | ret = snprintf(path, len, "%s/%s/partial", c->config_path, c->name); | |
157 | if (ret < 0 || ret >= len) { | |
158 | ERROR("Error writing partial pathname"); | |
159 | return; | |
160 | } | |
161 | if (process_lock()) | |
162 | return; | |
163 | if (unlink(path) < 0) | |
164 | SYSERROR("Error unlink partial file %s", path); | |
165 | process_unlock(); | |
166 | } | |
167 | ||
72d0e1cb | 168 | /* LOCKING |
3bc449ed SH |
169 | * 1. container_mem_lock(c) protects the struct lxc_container from multiple threads. |
170 | * 2. container_disk_lock(c) protects the on-disk container data - in particular the | |
171 | * container configuration file. | |
172 | * The container_disk_lock also takes the container_mem_lock. | |
173 | * 3. thread_mutex protects process data (ex: fd table) from multiple threads. | |
72d0e1cb SG |
174 | * NOTHING mutexes two independent programs with their own struct |
175 | * lxc_container for the same c->name, between API calls. For instance, | |
176 | * c->config_read(); c->start(); Between those calls, data on disk | |
177 | * could change (which shouldn't bother the caller unless for instance | |
178 | * the rootfs get moved). c->config_read(); update; c->config_write(); | |
179 | * Two such updaters could race. The callers should therefore check their | |
180 | * results. Trying to prevent that would necessarily expose us to deadlocks | |
181 | * due to hung callers. So I prefer to keep the locks only within our own | |
182 | * functions, not across functions. | |
183 | * | |
3bc449ed | 184 | * If you're going to clone while holding a lxccontainer, increment |
72d0e1cb SG |
185 | * c->numthreads (under privlock) before forking. When deleting, |
186 | * decrement numthreads under privlock, then if it hits 0 you can delete. | |
187 | * Do not ever use a lxccontainer whose numthreads you did not bump. | |
188 | */ | |
189 | ||
190 | static void lxc_container_free(struct lxc_container *c) | |
191 | { | |
192 | if (!c) | |
193 | return; | |
194 | ||
195 | if (c->configfile) { | |
196 | free(c->configfile); | |
197 | c->configfile = NULL; | |
198 | } | |
199 | if (c->error_string) { | |
200 | free(c->error_string); | |
201 | c->error_string = NULL; | |
202 | } | |
d95db067 | 203 | if (c->slock) { |
df271a59 | 204 | lxc_putlock(c->slock); |
d95db067 DE |
205 | c->slock = NULL; |
206 | } | |
72d0e1cb | 207 | if (c->privlock) { |
df271a59 | 208 | lxc_putlock(c->privlock); |
72d0e1cb SG |
209 | c->privlock = NULL; |
210 | } | |
211 | if (c->name) { | |
212 | free(c->name); | |
213 | c->name = NULL; | |
214 | } | |
d95db067 DE |
215 | if (c->lxc_conf) { |
216 | lxc_conf_free(c->lxc_conf); | |
217 | c->lxc_conf = NULL; | |
218 | } | |
2a59a681 SH |
219 | if (c->config_path) { |
220 | free(c->config_path); | |
221 | c->config_path = NULL; | |
222 | } | |
72d0e1cb SG |
223 | free(c); |
224 | } | |
225 | ||
43d1aa34 SH |
226 | /* |
227 | * Consider the following case: | |
228 | freer | racing get()er | |
229 | ================================================================== | |
230 | lxc_container_put() | lxc_container_get() | |
231 | \ lxclock(c->privlock) | c->numthreads < 1? (no) | |
232 | \ c->numthreads = 0 | \ lxclock(c->privlock) -> waits | |
233 | \ lxcunlock() | \ | |
234 | \ lxc_container_free() | \ lxclock() returns | |
235 | | \ c->numthreads < 1 -> return 0 | |
236 | \ \ (free stuff) | | |
237 | \ \ sem_destroy(privlock) | | |
238 | ||
239 | * When the get()er checks numthreads the first time, one of the following | |
240 | * is true: | |
241 | * 1. freer has set numthreads = 0. get() returns 0 | |
242 | * 2. freer is between lxclock and setting numthreads to 0. get()er will | |
243 | * sem_wait on privlock, get lxclock after freer() drops it, then see | |
244 | * numthreads is 0 and exit without touching lxclock again.. | |
245 | * 3. freer has not yet locked privlock. If get()er runs first, then put()er | |
246 | * will see --numthreads = 1 and not call lxc_container_free(). | |
247 | */ | |
248 | ||
72d0e1cb SG |
249 | int lxc_container_get(struct lxc_container *c) |
250 | { | |
251 | if (!c) | |
252 | return 0; | |
253 | ||
43d1aa34 SH |
254 | // if someone else has already started freeing the container, don't |
255 | // try to take the lock, which may be invalid | |
256 | if (c->numthreads < 1) | |
257 | return 0; | |
258 | ||
5cee8c50 | 259 | if (container_mem_lock(c)) |
72d0e1cb SG |
260 | return 0; |
261 | if (c->numthreads < 1) { | |
262 | // bail without trying to unlock, bc the privlock is now probably | |
263 | // in freed memory | |
264 | return 0; | |
265 | } | |
266 | c->numthreads++; | |
5cee8c50 | 267 | container_mem_unlock(c); |
72d0e1cb SG |
268 | return 1; |
269 | } | |
270 | ||
271 | int lxc_container_put(struct lxc_container *c) | |
272 | { | |
273 | if (!c) | |
274 | return -1; | |
5cee8c50 | 275 | if (container_mem_lock(c)) |
72d0e1cb SG |
276 | return -1; |
277 | if (--c->numthreads < 1) { | |
5cee8c50 | 278 | container_mem_unlock(c); |
72d0e1cb SG |
279 | lxc_container_free(c); |
280 | return 1; | |
281 | } | |
5cee8c50 | 282 | container_mem_unlock(c); |
72d0e1cb SG |
283 | return 0; |
284 | } | |
285 | ||
72d0e1cb SG |
286 | static bool lxcapi_is_defined(struct lxc_container *c) |
287 | { | |
288 | struct stat statbuf; | |
289 | bool ret = false; | |
290 | int statret; | |
291 | ||
292 | if (!c) | |
293 | return false; | |
294 | ||
5cee8c50 | 295 | if (container_mem_lock(c)) |
72d0e1cb SG |
296 | return false; |
297 | if (!c->configfile) | |
298 | goto out; | |
299 | statret = stat(c->configfile, &statbuf); | |
300 | if (statret != 0) | |
301 | goto out; | |
302 | ret = true; | |
303 | ||
304 | out: | |
5cee8c50 | 305 | container_mem_unlock(c); |
72d0e1cb SG |
306 | return ret; |
307 | } | |
308 | ||
309 | static const char *lxcapi_state(struct lxc_container *c) | |
310 | { | |
72d0e1cb SG |
311 | lxc_state_t s; |
312 | ||
313 | if (!c) | |
314 | return NULL; | |
13f5be62 | 315 | s = lxc_getstate(c->name, c->config_path); |
39dc698c | 316 | return lxc_state2str(s); |
72d0e1cb SG |
317 | } |
318 | ||
39dc698c | 319 | static bool is_stopped(struct lxc_container *c) |
794dd120 SH |
320 | { |
321 | lxc_state_t s; | |
13f5be62 | 322 | s = lxc_getstate(c->name, c->config_path); |
794dd120 SH |
323 | return (s == STOPPED); |
324 | } | |
325 | ||
72d0e1cb SG |
326 | static bool lxcapi_is_running(struct lxc_container *c) |
327 | { | |
328 | const char *s; | |
329 | ||
330 | if (!c) | |
331 | return false; | |
332 | s = lxcapi_state(c); | |
333 | if (!s || strcmp(s, "STOPPED") == 0) | |
334 | return false; | |
335 | return true; | |
336 | } | |
337 | ||
338 | static bool lxcapi_freeze(struct lxc_container *c) | |
339 | { | |
340 | int ret; | |
341 | if (!c) | |
342 | return false; | |
343 | ||
9123e471 | 344 | ret = lxc_freeze(c->name, c->config_path); |
72d0e1cb SG |
345 | if (ret) |
346 | return false; | |
347 | return true; | |
348 | } | |
349 | ||
350 | static bool lxcapi_unfreeze(struct lxc_container *c) | |
351 | { | |
352 | int ret; | |
353 | if (!c) | |
354 | return false; | |
355 | ||
9123e471 | 356 | ret = lxc_unfreeze(c->name, c->config_path); |
72d0e1cb SG |
357 | if (ret) |
358 | return false; | |
359 | return true; | |
360 | } | |
361 | ||
b5159817 | 362 | static int lxcapi_console_getfd(struct lxc_container *c, int *ttynum, int *masterfd) |
0115f8fd DE |
363 | { |
364 | int ttyfd; | |
365 | if (!c) | |
366 | return -1; | |
367 | ||
b5159817 | 368 | ttyfd = lxc_console_getfd(c, ttynum, masterfd); |
0115f8fd DE |
369 | return ttyfd; |
370 | } | |
371 | ||
b5159817 DE |
372 | static int lxcapi_console(struct lxc_container *c, int ttynum, int stdinfd, |
373 | int stdoutfd, int stderrfd, int escape) | |
374 | { | |
375 | return lxc_console(c, ttynum, stdinfd, stdoutfd, stderrfd, escape); | |
376 | } | |
377 | ||
72d0e1cb SG |
378 | static pid_t lxcapi_init_pid(struct lxc_container *c) |
379 | { | |
72d0e1cb SG |
380 | if (!c) |
381 | return -1; | |
382 | ||
5cee8c50 | 383 | return lxc_cmd_get_init_pid(c->name, c->config_path); |
72d0e1cb SG |
384 | } |
385 | ||
12a50cc6 | 386 | static bool load_config_locked(struct lxc_container *c, const char *fname) |
8eb5694b SH |
387 | { |
388 | if (!c->lxc_conf) | |
389 | c->lxc_conf = lxc_conf_init(); | |
390 | if (c->lxc_conf && !lxc_config_read(fname, c->lxc_conf)) | |
391 | return true; | |
392 | return false; | |
393 | } | |
394 | ||
12a50cc6 | 395 | static bool lxcapi_load_config(struct lxc_container *c, const char *alt_file) |
72d0e1cb | 396 | { |
39dc698c SH |
397 | bool ret = false, need_disklock = false; |
398 | int lret; | |
12a50cc6 | 399 | const char *fname; |
72d0e1cb SG |
400 | if (!c) |
401 | return false; | |
402 | ||
403 | fname = c->configfile; | |
404 | if (alt_file) | |
405 | fname = alt_file; | |
406 | if (!fname) | |
407 | return false; | |
39dc698c SH |
408 | /* |
409 | * If we're reading something other than the container's config, | |
410 | * we only need to lock the in-memory container. If loading the | |
411 | * container's config file, take the disk lock. | |
412 | */ | |
413 | if (strcmp(fname, c->configfile) == 0) | |
414 | need_disklock = true; | |
415 | ||
416 | if (need_disklock) | |
417 | lret = container_disk_lock(c); | |
418 | else | |
419 | lret = container_mem_lock(c); | |
420 | if (lret) | |
72d0e1cb | 421 | return false; |
39dc698c | 422 | |
8eb5694b | 423 | ret = load_config_locked(c, fname); |
39dc698c SH |
424 | |
425 | if (need_disklock) | |
426 | container_disk_unlock(c); | |
427 | else | |
428 | container_mem_unlock(c); | |
72d0e1cb SG |
429 | return ret; |
430 | } | |
431 | ||
432 | static void lxcapi_want_daemonize(struct lxc_container *c) | |
433 | { | |
434 | if (!c) | |
435 | return; | |
f02abefe | 436 | if (container_mem_lock(c)) { |
3bc449ed SH |
437 | ERROR("Error getting mem lock"); |
438 | return; | |
439 | } | |
72d0e1cb | 440 | c->daemonize = 1; |
3bc449ed | 441 | container_mem_unlock(c); |
72d0e1cb SG |
442 | } |
443 | ||
12a50cc6 | 444 | static bool lxcapi_wait(struct lxc_container *c, const char *state, int timeout) |
7a44c8b4 SG |
445 | { |
446 | int ret; | |
447 | ||
448 | if (!c) | |
449 | return false; | |
450 | ||
67e571de | 451 | ret = lxc_wait(c->name, state, timeout, c->config_path); |
7a44c8b4 SG |
452 | return ret == 0; |
453 | } | |
454 | ||
455 | ||
456 | static bool wait_on_daemonized_start(struct lxc_container *c) | |
457 | { | |
458 | /* we'll probably want to make this timeout configurable? */ | |
697fa639 | 459 | int timeout = 5, ret, status; |
7a44c8b4 | 460 | |
697fa639 SH |
461 | /* |
462 | * our child is going to fork again, then exit. reap the | |
463 | * child | |
464 | */ | |
465 | ret = wait(&status); | |
466 | if (ret == -1 || !WIFEXITED(status) || WEXITSTATUS(status) != 0) | |
467 | DEBUG("failed waiting for first dual-fork child"); | |
7a44c8b4 SG |
468 | return lxcapi_wait(c, "RUNNING", timeout); |
469 | } | |
470 | ||
72d0e1cb SG |
471 | /* |
472 | * I can't decide if it'd be more convenient for callers if we accept '...', | |
473 | * or a null-terminated array (i.e. execl vs execv) | |
474 | */ | |
12a50cc6 | 475 | static bool lxcapi_start(struct lxc_container *c, int useinit, char * const argv[]) |
72d0e1cb SG |
476 | { |
477 | int ret; | |
478 | struct lxc_conf *conf; | |
479 | int daemonize = 0; | |
480 | char *default_args[] = { | |
481 | "/sbin/init", | |
482 | '\0', | |
483 | }; | |
484 | ||
485 | /* container exists */ | |
486 | if (!c) | |
487 | return false; | |
488 | /* container has been setup */ | |
489 | if (!c->lxc_conf) | |
490 | return false; | |
491 | ||
3e625e2d SH |
492 | if ((ret = ongoing_create(c)) < 0) { |
493 | ERROR("Error checking for incomplete creation"); | |
494 | return false; | |
495 | } | |
496 | if (ret == 2) { | |
497 | ERROR("Error: %s creation was not completed", c->name); | |
498 | c->destroy(c); | |
499 | return false; | |
500 | } else if (ret == 1) { | |
501 | ERROR("Error: creation of %s is ongoing", c->name); | |
502 | return false; | |
503 | } | |
504 | ||
72d0e1cb SG |
505 | /* is this app meant to be run through lxcinit, as in lxc-execute? */ |
506 | if (useinit && !argv) | |
507 | return false; | |
508 | ||
5cee8c50 | 509 | if (container_mem_lock(c)) |
72d0e1cb SG |
510 | return false; |
511 | conf = c->lxc_conf; | |
512 | daemonize = c->daemonize; | |
5cee8c50 | 513 | container_mem_unlock(c); |
72d0e1cb SG |
514 | |
515 | if (useinit) { | |
13f5be62 | 516 | ret = lxc_execute(c->name, argv, 1, conf, c->config_path); |
72d0e1cb SG |
517 | return ret == 0 ? true : false; |
518 | } | |
519 | ||
520 | if (!argv) | |
521 | argv = default_args; | |
522 | ||
523 | /* | |
524 | * say, I'm not sure - what locks do we want here? Any? | |
525 | * Is liblxc's locking enough here to protect the on disk | |
526 | * container? We don't want to exclude things like lxc_info | |
527 | * while container is running... | |
528 | */ | |
529 | if (daemonize) { | |
530 | if (!lxc_container_get(c)) | |
531 | return false; | |
e51d4895 | 532 | lxc_monitord_spawn(c->config_path); |
71454076 | 533 | |
5cee8c50 | 534 | if (process_lock()) |
71454076 | 535 | return false; |
72d0e1cb SG |
536 | pid_t pid = fork(); |
537 | if (pid < 0) { | |
538 | lxc_container_put(c); | |
5cee8c50 | 539 | process_unlock(); |
72d0e1cb SG |
540 | return false; |
541 | } | |
71454076 DE |
542 | if (pid != 0) { |
543 | ret = wait_on_daemonized_start(c); | |
5cee8c50 | 544 | process_unlock(); |
71454076 DE |
545 | return ret; |
546 | } | |
5cee8c50 | 547 | process_unlock(); |
697fa639 SH |
548 | /* second fork to be reparented by init */ |
549 | pid = fork(); | |
550 | if (pid < 0) { | |
551 | SYSERROR("Error doing dual-fork"); | |
552 | return false; | |
553 | } | |
554 | if (pid != 0) | |
555 | exit(0); | |
72d0e1cb | 556 | /* like daemon(), chdir to / and redirect 0,1,2 to /dev/null */ |
c278cef2 SH |
557 | if (chdir("/")) { |
558 | SYSERROR("Error chdir()ing to /."); | |
559 | return false; | |
560 | } | |
72d0e1cb SG |
561 | close(0); |
562 | close(1); | |
563 | close(2); | |
eddaaafd | 564 | open("/dev/zero", O_RDONLY); |
72d0e1cb SG |
565 | open("/dev/null", O_RDWR); |
566 | open("/dev/null", O_RDWR); | |
567 | setsid(); | |
568 | } | |
569 | ||
72d0e1cb SG |
570 | reboot: |
571 | conf->reboot = 0; | |
13f5be62 | 572 | ret = lxc_start(c->name, argv, conf, c->config_path); |
72d0e1cb SG |
573 | |
574 | if (conf->reboot) { | |
575 | INFO("container requested reboot"); | |
576 | conf->reboot = 0; | |
72d0e1cb SG |
577 | goto reboot; |
578 | } | |
579 | ||
580 | if (daemonize) { | |
581 | lxc_container_put(c); | |
582 | exit (ret == 0 ? true : false); | |
583 | } else { | |
584 | return (ret == 0 ? true : false); | |
585 | } | |
586 | } | |
587 | ||
588 | /* | |
589 | * note there MUST be an ending NULL | |
590 | */ | |
591 | static bool lxcapi_startl(struct lxc_container *c, int useinit, ...) | |
592 | { | |
593 | va_list ap; | |
a0e93eeb | 594 | char **inargs = NULL; |
72d0e1cb SG |
595 | bool bret = false; |
596 | ||
597 | /* container exists */ | |
598 | if (!c) | |
599 | return false; | |
600 | ||
72d0e1cb | 601 | va_start(ap, useinit); |
a0e93eeb | 602 | inargs = lxc_va_arg_list_to_argv(ap, 0, 1); |
72d0e1cb SG |
603 | va_end(ap); |
604 | ||
a0e93eeb CS |
605 | if (!inargs) { |
606 | ERROR("Memory allocation error."); | |
607 | goto out; | |
72d0e1cb SG |
608 | } |
609 | ||
a0e93eeb CS |
610 | /* pass NULL if no arguments were supplied */ |
611 | bret = lxcapi_start(c, useinit, *inargs ? inargs : NULL); | |
72d0e1cb SG |
612 | |
613 | out: | |
614 | if (inargs) { | |
a0e93eeb CS |
615 | char *arg; |
616 | for (arg = *inargs; arg; arg++) | |
617 | free(arg); | |
72d0e1cb SG |
618 | free(inargs); |
619 | } | |
620 | ||
621 | return bret; | |
622 | } | |
623 | ||
624 | static bool lxcapi_stop(struct lxc_container *c) | |
625 | { | |
626 | int ret; | |
627 | ||
628 | if (!c) | |
629 | return false; | |
630 | ||
ef6e34ee | 631 | ret = lxc_cmd_stop(c->name, c->config_path); |
72d0e1cb SG |
632 | |
633 | return ret == 0; | |
72d0e1cb SG |
634 | } |
635 | ||
72d0e1cb SG |
636 | /* |
637 | * create the standard expected container dir | |
638 | */ | |
639 | static bool create_container_dir(struct lxc_container *c) | |
640 | { | |
641 | char *s; | |
642 | int len, ret; | |
643 | ||
2a59a681 | 644 | len = strlen(c->config_path) + strlen(c->name) + 2; |
72d0e1cb SG |
645 | s = malloc(len); |
646 | if (!s) | |
647 | return false; | |
2a59a681 | 648 | ret = snprintf(s, len, "%s/%s", c->config_path, c->name); |
72d0e1cb SG |
649 | if (ret < 0 || ret >= len) { |
650 | free(s); | |
651 | return false; | |
652 | } | |
653 | ret = mkdir(s, 0755); | |
654 | if (ret) { | |
655 | if (errno == EEXIST) | |
656 | ret = 0; | |
657 | else | |
658 | SYSERROR("failed to create container path for %s\n", c->name); | |
659 | } | |
660 | free(s); | |
661 | return ret == 0; | |
662 | } | |
663 | ||
1897e3bc SH |
664 | static const char *lxcapi_get_config_path(struct lxc_container *c); |
665 | static bool lxcapi_set_config_item(struct lxc_container *c, const char *key, const char *v); | |
666 | ||
72d0e1cb | 667 | /* |
1897e3bc SH |
668 | * do_bdev_create: thin wrapper around bdev_create(). Like bdev_create(), |
669 | * it returns a mounted bdev on success, NULL on error. | |
72d0e1cb | 670 | */ |
1897e3bc SH |
671 | static struct bdev *do_bdev_create(struct lxc_container *c, const char *type, |
672 | struct bdev_specs *specs) | |
673 | { | |
674 | char *dest; | |
675 | const char *lxcpath = lxcapi_get_config_path(c); | |
676 | size_t len; | |
677 | struct bdev *bdev; | |
678 | int ret; | |
679 | ||
680 | /* lxcpath/lxcname/rootfs */ | |
681 | len = strlen(c->name) + strlen(lxcpath) + 9; | |
682 | dest = alloca(len); | |
683 | ret = snprintf(dest, len, "%s/%s/rootfs", lxcpath, c->name); | |
684 | if (ret < 0 || ret >= len) | |
685 | return NULL; | |
686 | ||
687 | bdev = bdev_create(dest, type, c->name, specs); | |
d44e88c2 SH |
688 | if (!bdev) { |
689 | ERROR("Failed to create backing store type %s\n", type); | |
1897e3bc | 690 | return NULL; |
d44e88c2 SH |
691 | } |
692 | ||
1897e3bc SH |
693 | lxcapi_set_config_item(c, "lxc.rootfs", bdev->src); |
694 | return bdev; | |
695 | } | |
696 | ||
cbee8106 SH |
697 | /* |
698 | * Given the '-t' template option to lxc-create, figure out what to | |
699 | * do. If the template is a full executable path, use that. If it | |
700 | * is something like 'sshd', then return $templatepath/lxc-sshd. If | |
701 | * no template was passed in, return NULL (this is ok). | |
702 | * On error return (char *) -1. | |
703 | */ | |
704 | char *get_template_path(const char *t) | |
705 | { | |
706 | int ret, len; | |
707 | char *tpath; | |
708 | ||
709 | if (!t) | |
710 | return NULL; | |
711 | ||
712 | if (t[0] == '/' && access(t, X_OK) == 0) { | |
713 | tpath = strdup(t); | |
714 | if (!tpath) | |
715 | return (char *) -1; | |
716 | return tpath; | |
717 | } | |
718 | ||
719 | len = strlen(LXCTEMPLATEDIR) + strlen(t) + strlen("/lxc-") + 1; | |
720 | tpath = malloc(len); | |
721 | if (!tpath) | |
722 | return (char *) -1; | |
723 | ret = snprintf(tpath, len, "%s/lxc-%s", LXCTEMPLATEDIR, t); | |
724 | if (ret < 0 || ret >= len) { | |
725 | free(tpath); | |
726 | return (char *) -1; | |
727 | } | |
728 | if (access(tpath, X_OK) < 0) { | |
729 | SYSERROR("bad template: %s\n", t); | |
730 | free(tpath); | |
731 | return (char *) -1; | |
732 | } | |
733 | ||
734 | return tpath; | |
735 | } | |
736 | ||
96b3cb40 | 737 | static char *lxcbasename(char *path) |
72d0e1cb | 738 | { |
96b3cb40 SH |
739 | char *p = path + strlen(path) - 1; |
740 | while (*p != '/' && p > path) | |
741 | p--; | |
742 | return p; | |
743 | } | |
72d0e1cb | 744 | |
dc23c1c8 | 745 | static bool create_run_template(struct lxc_container *c, char *tpath, bool quiet, |
96b3cb40 SH |
746 | char *const argv[]) |
747 | { | |
748 | pid_t pid; | |
72d0e1cb | 749 | |
72d0e1cb | 750 | if (!tpath) |
96b3cb40 | 751 | return true; |
72d0e1cb SG |
752 | |
753 | pid = fork(); | |
754 | if (pid < 0) { | |
755 | SYSERROR("failed to fork task for container creation template\n"); | |
96b3cb40 | 756 | return false; |
72d0e1cb SG |
757 | } |
758 | ||
759 | if (pid == 0) { // child | |
1897e3bc SH |
760 | char *patharg, *namearg, *rootfsarg, *src; |
761 | struct bdev *bdev = NULL; | |
72d0e1cb | 762 | int i; |
96b3cb40 SH |
763 | int ret, len, nargs = 0; |
764 | char **newargv; | |
72d0e1cb | 765 | |
dc23c1c8 SH |
766 | if (quiet) { |
767 | close(0); | |
768 | close(1); | |
769 | close(2); | |
770 | open("/dev/zero", O_RDONLY); | |
771 | open("/dev/null", O_RDWR); | |
772 | open("/dev/null", O_RDWR); | |
773 | } | |
1897e3bc SH |
774 | if (unshare(CLONE_NEWNS) < 0) { |
775 | ERROR("error unsharing mounts"); | |
776 | exit(1); | |
777 | } | |
778 | ||
779 | src = c->lxc_conf->rootfs.path; | |
780 | /* | |
781 | * for an overlayfs create, what the user wants is the template to fill | |
782 | * in what will become the readonly lower layer. So don't mount for | |
783 | * the template | |
784 | */ | |
785 | if (strncmp(src, "overlayfs:", 10) == 0) { | |
786 | src = overlayfs_getlower(src+10); | |
787 | } | |
788 | bdev = bdev_init(src, c->lxc_conf->rootfs.mount, NULL); | |
789 | if (!bdev) { | |
790 | ERROR("Error opening rootfs"); | |
791 | exit(1); | |
792 | } | |
793 | ||
794 | if (bdev->ops->mount(bdev) < 0) { | |
795 | ERROR("Error mounting rootfs"); | |
796 | exit(1); | |
797 | } | |
798 | ||
72d0e1cb SG |
799 | /* |
800 | * create our new array, pre-pend the template name and | |
801 | * base args | |
802 | */ | |
803 | if (argv) | |
1897e3bc SH |
804 | for (nargs = 0; argv[nargs]; nargs++) ; |
805 | nargs += 4; // template, path, rootfs and name args | |
72d0e1cb SG |
806 | newargv = malloc(nargs * sizeof(*newargv)); |
807 | if (!newargv) | |
808 | exit(1); | |
96b3cb40 | 809 | newargv[0] = lxcbasename(tpath); |
72d0e1cb | 810 | |
2a59a681 | 811 | len = strlen(c->config_path) + strlen(c->name) + strlen("--path=") + 2; |
72d0e1cb SG |
812 | patharg = malloc(len); |
813 | if (!patharg) | |
814 | exit(1); | |
2a59a681 | 815 | ret = snprintf(patharg, len, "--path=%s/%s", c->config_path, c->name); |
72d0e1cb SG |
816 | if (ret < 0 || ret >= len) |
817 | exit(1); | |
818 | newargv[1] = patharg; | |
819 | len = strlen("--name=") + strlen(c->name) + 1; | |
820 | namearg = malloc(len); | |
821 | if (!namearg) | |
822 | exit(1); | |
823 | ret = snprintf(namearg, len, "--name=%s", c->name); | |
824 | if (ret < 0 || ret >= len) | |
825 | exit(1); | |
826 | newargv[2] = namearg; | |
827 | ||
1897e3bc SH |
828 | len = strlen("--rootfs=") + 1 + strlen(bdev->dest); |
829 | rootfsarg = malloc(len); | |
830 | if (!rootfsarg) | |
831 | exit(1); | |
832 | ret = snprintf(rootfsarg, len, "--rootfs=%s", bdev->dest); | |
833 | if (ret < 0 || ret >= len) | |
834 | exit(1); | |
835 | newargv[3] = rootfsarg; | |
836 | ||
72d0e1cb SG |
837 | /* add passed-in args */ |
838 | if (argv) | |
1897e3bc SH |
839 | for (i = 4; i < nargs; i++) |
840 | newargv[i] = argv[i-4]; | |
72d0e1cb SG |
841 | |
842 | /* add trailing NULL */ | |
843 | nargs++; | |
844 | newargv = realloc(newargv, nargs * sizeof(*newargv)); | |
845 | if (!newargv) | |
846 | exit(1); | |
847 | newargv[nargs - 1] = NULL; | |
848 | ||
849 | /* execute */ | |
e6a19d26 | 850 | execv(tpath, newargv); |
72d0e1cb SG |
851 | SYSERROR("failed to execute template %s", tpath); |
852 | exit(1); | |
853 | } | |
854 | ||
9be53773 SH |
855 | if (wait_for_pid(pid) != 0) { |
856 | ERROR("container creation template for %s failed\n", c->name); | |
96b3cb40 SH |
857 | return false; |
858 | } | |
859 | ||
860 | return true; | |
861 | } | |
862 | ||
3ce74686 SH |
863 | bool prepend_lxc_header(char *path, const char *t, char *const argv[]) |
864 | { | |
1fd9bd50 | 865 | long flen; |
b4569e93 | 866 | char *contents; |
3ce74686 | 867 | FILE *f; |
52026772 SH |
868 | #if HAVE_LIBGNUTLS |
869 | int i, ret; | |
3ce74686 | 870 | unsigned char md_value[SHA_DIGEST_LENGTH]; |
b4569e93 | 871 | char *tpath; |
3ce74686 | 872 | bool have_tpath = false; |
52026772 | 873 | #endif |
3ce74686 SH |
874 | |
875 | if ((f = fopen(path, "r")) == NULL) { | |
876 | SYSERROR("Opening old config"); | |
877 | return false; | |
878 | } | |
879 | if (fseek(f, 0, SEEK_END) < 0) { | |
880 | SYSERROR("Seeking to end of old config file"); | |
881 | fclose(f); | |
882 | return false; | |
883 | } | |
884 | if ((flen = ftell(f)) < 0) { | |
885 | SYSERROR("telling size of old config"); | |
886 | fclose(f); | |
887 | return false; | |
888 | } | |
889 | if (fseek(f, 0, SEEK_SET) < 0) { | |
890 | SYSERROR("rewinding old config"); | |
891 | fclose(f); | |
892 | return false; | |
893 | } | |
894 | if ((contents = malloc(flen + 1)) == NULL) { | |
895 | SYSERROR("out of memory"); | |
896 | fclose(f); | |
897 | return false; | |
898 | } | |
899 | if (fread(contents, 1, flen, f) != flen) { | |
900 | SYSERROR("Reading old config"); | |
901 | free(contents); | |
902 | fclose(f); | |
903 | return false; | |
904 | } | |
905 | contents[flen] = '\0'; | |
906 | if (fclose(f) < 0) { | |
907 | SYSERROR("closing old config"); | |
908 | free(contents); | |
909 | return false; | |
910 | } | |
911 | ||
b4569e93 | 912 | #if HAVE_LIBGNUTLS |
01efd4d3 SH |
913 | tpath = get_template_path(t); |
914 | if (tpath == (char *) -1) { | |
3ce74686 SH |
915 | ERROR("bad template: %s\n", t); |
916 | free(contents); | |
917 | return false; | |
918 | } | |
919 | ||
3ce74686 SH |
920 | if (tpath) { |
921 | have_tpath = true; | |
922 | ret = sha1sum_file(tpath, md_value); | |
923 | if (ret < 0) { | |
924 | ERROR("Error getting sha1sum of %s", tpath); | |
925 | free(contents); | |
926 | return false; | |
927 | } | |
928 | free(tpath); | |
929 | } | |
930 | #endif | |
931 | ||
932 | if ((f = fopen(path, "w")) == NULL) { | |
933 | SYSERROR("reopening config for writing"); | |
934 | free(contents); | |
935 | return false; | |
936 | } | |
937 | fprintf(f, "# Template used to create this container: %s\n", t); | |
938 | if (argv) { | |
939 | fprintf(f, "# Parameters passed to the template:"); | |
940 | while (*argv) { | |
941 | fprintf(f, " %s", *argv); | |
942 | argv++; | |
943 | } | |
944 | fprintf(f, "\n"); | |
945 | } | |
946 | #if HAVE_LIBGNUTLS | |
947 | if (have_tpath) { | |
948 | fprintf(f, "# Template script checksum (SHA-1): "); | |
949 | for (i=0; i<SHA_DIGEST_LENGTH; i++) | |
950 | fprintf(f, "%02x", md_value[i]); | |
951 | fprintf(f, "\n"); | |
952 | } | |
953 | #endif | |
954 | if (fwrite(contents, 1, flen, f) != flen) { | |
955 | SYSERROR("Writing original contents"); | |
956 | free(contents); | |
957 | fclose(f); | |
958 | return false; | |
959 | } | |
960 | free(contents); | |
961 | if (fclose(f) < 0) { | |
962 | SYSERROR("Closing config file after write"); | |
963 | return false; | |
964 | } | |
965 | return true; | |
966 | } | |
967 | ||
96b3cb40 SH |
968 | static bool lxcapi_destroy(struct lxc_container *c); |
969 | /* | |
970 | * lxcapi_create: | |
971 | * create a container with the given parameters. | |
972 | * @c: container to be created. It has the lxcpath, name, and a starting | |
973 | * configuration already set | |
974 | * @t: the template to execute to instantiate the root filesystem and | |
975 | * adjust the configuration. | |
976 | * @bdevtype: backing store type to use. If NULL, dir will be used. | |
977 | * @specs: additional parameters for the backing store, i.e. LVM vg to | |
978 | * use. | |
979 | * | |
980 | * @argv: the arguments to pass to the template, terminated by NULL. If no | |
981 | * arguments, you can just pass NULL. | |
982 | */ | |
983 | static bool lxcapi_create(struct lxc_container *c, const char *t, | |
dc23c1c8 | 984 | const char *bdevtype, struct bdev_specs *specs, int flags, |
96b3cb40 SH |
985 | char *const argv[]) |
986 | { | |
987 | bool bret = false; | |
988 | pid_t pid; | |
cbee8106 SH |
989 | char *tpath; |
990 | int partial_fd; | |
96b3cb40 SH |
991 | |
992 | if (!c) | |
993 | return false; | |
994 | ||
01efd4d3 SH |
995 | tpath = get_template_path(t); |
996 | if (tpath == (char *) -1) { | |
96b3cb40 SH |
997 | ERROR("bad template: %s\n", t); |
998 | goto out; | |
999 | } | |
1000 | ||
1001 | if (!c->save_config(c, NULL)) { | |
1002 | ERROR("failed to save starting configuration for %s\n", c->name); | |
1003 | goto out; | |
1004 | } | |
1005 | ||
1006 | /* container is already created if we have a config and rootfs.path is accessible */ | |
1007 | if (lxcapi_is_defined(c) && c->lxc_conf && c->lxc_conf->rootfs.path && access(c->lxc_conf->rootfs.path, F_OK) == 0) | |
1008 | goto out; | |
1009 | ||
1010 | /* Mark that this container is being created */ | |
1011 | if ((partial_fd = create_partial(c)) < 0) | |
1012 | goto out; | |
1013 | ||
1014 | /* no need to get disk lock bc we have the partial locked */ | |
1015 | ||
1016 | /* | |
1017 | * Create the backing store | |
1018 | * Note we can't do this in the same task as we use to execute the | |
1019 | * template because of the way zfs works. | |
1020 | * After you 'zfs create', zfs mounts the fs only in the initial | |
1021 | * namespace. | |
1022 | */ | |
1023 | pid = fork(); | |
1024 | if (pid < 0) { | |
1025 | SYSERROR("failed to fork task for container creation template\n"); | |
8eb5694b SH |
1026 | goto out_unlock; |
1027 | } | |
1028 | ||
96b3cb40 SH |
1029 | if (pid == 0) { // child |
1030 | struct bdev *bdev = NULL; | |
1031 | ||
1032 | if (!(bdev = do_bdev_create(c, bdevtype, specs))) { | |
1033 | ERROR("Error creating backing store type %s for %s", | |
1034 | bdevtype ? bdevtype : "(none)", c->name); | |
1035 | exit(1); | |
1036 | } | |
1037 | ||
1038 | /* save config file again to store the new rootfs location */ | |
1039 | if (!c->save_config(c, NULL)) { | |
1040 | ERROR("failed to save starting configuration for %s\n", c->name); | |
1041 | // parent task won't see bdev in config so we delete it | |
1042 | bdev->ops->umount(bdev); | |
1043 | bdev->ops->destroy(bdev); | |
1044 | exit(1); | |
1045 | } | |
1046 | exit(0); | |
1047 | } | |
1048 | if (wait_for_pid(pid) != 0) | |
a09295f8 | 1049 | goto out_unlock; |
96b3cb40 SH |
1050 | |
1051 | /* reload config to get the rootfs */ | |
1052 | if (c->lxc_conf) | |
1053 | lxc_conf_free(c->lxc_conf); | |
1054 | c->lxc_conf = NULL; | |
1055 | if (!load_config_locked(c, c->configfile)) | |
a09295f8 | 1056 | goto out_unlock; |
96b3cb40 | 1057 | |
dc23c1c8 | 1058 | if (!create_run_template(c, tpath, !!(flags & LXC_CREATE_QUIET), argv)) |
96b3cb40 SH |
1059 | goto out_unlock; |
1060 | ||
8eb5694b SH |
1061 | // now clear out the lxc_conf we have, reload from the created |
1062 | // container | |
1063 | if (c->lxc_conf) | |
1064 | lxc_conf_free(c->lxc_conf); | |
1065 | c->lxc_conf = NULL; | |
3ce74686 SH |
1066 | |
1067 | if (!prepend_lxc_header(c->configfile, tpath, argv)) { | |
1068 | ERROR("Error prepending header to configuration file"); | |
1069 | goto out_unlock; | |
1070 | } | |
8eb5694b | 1071 | bret = load_config_locked(c, c->configfile); |
72d0e1cb SG |
1072 | |
1073 | out_unlock: | |
3e625e2d SH |
1074 | if (partial_fd >= 0) |
1075 | remove_partial(c, partial_fd); | |
72d0e1cb SG |
1076 | out: |
1077 | if (tpath) | |
1078 | free(tpath); | |
1897e3bc SH |
1079 | if (!bret && c) |
1080 | lxcapi_destroy(c); | |
72d0e1cb SG |
1081 | return bret; |
1082 | } | |
1083 | ||
3e625e2d SH |
1084 | static bool lxcapi_reboot(struct lxc_container *c) |
1085 | { | |
1086 | pid_t pid; | |
1087 | ||
1088 | if (!c) | |
1089 | return false; | |
1090 | if (!c->is_running(c)) | |
1091 | return false; | |
1092 | pid = c->init_pid(c); | |
1093 | if (pid <= 0) | |
1094 | return false; | |
1095 | if (kill(pid, SIGINT) < 0) | |
1096 | return false; | |
1097 | return true; | |
1098 | ||
1099 | } | |
1100 | ||
72d0e1cb SG |
1101 | static bool lxcapi_shutdown(struct lxc_container *c, int timeout) |
1102 | { | |
1103 | bool retv; | |
1104 | pid_t pid; | |
1105 | ||
1106 | if (!c) | |
1107 | return false; | |
1108 | ||
1109 | if (!timeout) | |
1110 | timeout = -1; | |
1111 | if (!c->is_running(c)) | |
1112 | return true; | |
1113 | pid = c->init_pid(c); | |
1114 | if (pid <= 0) | |
1115 | return true; | |
1116 | kill(pid, SIGPWR); | |
1117 | retv = c->wait(c, "STOPPED", timeout); | |
f6144ed4 | 1118 | if (!retv && timeout > 0) { |
72d0e1cb SG |
1119 | c->stop(c); |
1120 | retv = c->wait(c, "STOPPED", 0); // 0 means don't wait | |
1121 | } | |
1122 | return retv; | |
1123 | } | |
1124 | ||
1897e3bc | 1125 | static bool lxcapi_createl(struct lxc_container *c, const char *t, |
dc23c1c8 | 1126 | const char *bdevtype, struct bdev_specs *specs, int flags, ...) |
72d0e1cb SG |
1127 | { |
1128 | bool bret = false; | |
a0e93eeb | 1129 | char **args = NULL; |
72d0e1cb | 1130 | va_list ap; |
72d0e1cb SG |
1131 | |
1132 | if (!c) | |
1133 | return false; | |
1134 | ||
1135 | /* | |
1136 | * since we're going to wait for create to finish, I don't think we | |
1137 | * need to get a copy of the arguments. | |
1138 | */ | |
dc23c1c8 | 1139 | va_start(ap, flags); |
a0e93eeb | 1140 | args = lxc_va_arg_list_to_argv(ap, 0, 0); |
72d0e1cb | 1141 | va_end(ap); |
a0e93eeb CS |
1142 | if (!args) { |
1143 | ERROR("Memory allocation error."); | |
1144 | goto out; | |
1145 | } | |
72d0e1cb | 1146 | |
dc23c1c8 | 1147 | bret = c->create(c, t, bdevtype, specs, flags, args); |
72d0e1cb SG |
1148 | |
1149 | out: | |
a0e93eeb | 1150 | free(args); |
72d0e1cb SG |
1151 | return bret; |
1152 | } | |
1153 | ||
12a50cc6 | 1154 | static bool lxcapi_clear_config_item(struct lxc_container *c, const char *key) |
72d0e1cb SG |
1155 | { |
1156 | int ret; | |
1157 | ||
1158 | if (!c || !c->lxc_conf) | |
1159 | return false; | |
5cee8c50 | 1160 | if (container_mem_lock(c)) |
72d0e1cb | 1161 | return false; |
72d0e1cb | 1162 | ret = lxc_clear_config_item(c->lxc_conf, key); |
5cee8c50 | 1163 | container_mem_unlock(c); |
72d0e1cb SG |
1164 | return ret == 0; |
1165 | } | |
1166 | ||
9c83a661 SG |
1167 | char** lxcapi_get_ips(struct lxc_container *c, char* interface, char* family, int scope) |
1168 | { | |
1169 | int count = 0; | |
1170 | struct ifaddrs *interfaceArray = NULL, *tempIfAddr = NULL; | |
1171 | char addressOutputBuffer[INET6_ADDRSTRLEN]; | |
1172 | void *tempAddrPtr = NULL; | |
1173 | char **addresses = NULL, **temp; | |
1174 | char *address = NULL; | |
1175 | char new_netns_path[MAXPATHLEN]; | |
1176 | int old_netns = -1, new_netns = -1, ret = 0; | |
1177 | ||
1178 | if (!c->is_running(c)) | |
1179 | goto out; | |
1180 | ||
1181 | /* Save reference to old netns */ | |
1182 | old_netns = open("/proc/self/ns/net", O_RDONLY); | |
1183 | if (old_netns < 0) { | |
1184 | SYSERROR("failed to open /proc/self/ns/net"); | |
1185 | goto out; | |
1186 | } | |
1187 | ||
1188 | /* Switch to new netns */ | |
1189 | ret = snprintf(new_netns_path, MAXPATHLEN, "/proc/%d/ns/net", c->init_pid(c)); | |
1190 | if (ret < 0 || ret >= MAXPATHLEN) | |
1191 | goto out; | |
1192 | ||
1193 | new_netns = open(new_netns_path, O_RDONLY); | |
1194 | if (new_netns < 0) { | |
1195 | SYSERROR("failed to open %s", new_netns_path); | |
1196 | goto out; | |
1197 | } | |
1198 | ||
1199 | if (setns(new_netns, CLONE_NEWNET)) { | |
1200 | SYSERROR("failed to setns"); | |
1201 | goto out; | |
1202 | } | |
1203 | ||
1204 | /* Grab the list of interfaces */ | |
1205 | if (getifaddrs(&interfaceArray)) { | |
1206 | SYSERROR("failed to get interfaces list"); | |
1207 | goto out; | |
1208 | } | |
1209 | ||
1210 | /* Iterate through the interfaces */ | |
1211 | for (tempIfAddr = interfaceArray; tempIfAddr != NULL; tempIfAddr = tempIfAddr->ifa_next) { | |
1212 | if(tempIfAddr->ifa_addr->sa_family == AF_INET) { | |
1213 | if (family && strcmp(family, "inet")) | |
1214 | continue; | |
1215 | tempAddrPtr = &((struct sockaddr_in *)tempIfAddr->ifa_addr)->sin_addr; | |
1216 | } | |
1217 | else { | |
1218 | if (family && strcmp(family, "inet6")) | |
1219 | continue; | |
1220 | ||
1221 | if (((struct sockaddr_in6 *)tempIfAddr->ifa_addr)->sin6_scope_id != scope) | |
1222 | continue; | |
1223 | ||
1224 | tempAddrPtr = &((struct sockaddr_in6 *)tempIfAddr->ifa_addr)->sin6_addr; | |
1225 | } | |
1226 | ||
1227 | if (interface && strcmp(interface, tempIfAddr->ifa_name)) | |
1228 | continue; | |
1229 | else if (!interface && strcmp("lo", tempIfAddr->ifa_name) == 0) | |
1230 | continue; | |
1231 | ||
1232 | address = (char *)inet_ntop(tempIfAddr->ifa_addr->sa_family, | |
1233 | tempAddrPtr, | |
1234 | addressOutputBuffer, | |
1235 | sizeof(addressOutputBuffer)); | |
1236 | if (!address) | |
1237 | continue; | |
1238 | ||
1239 | count += 1; | |
1240 | temp = realloc(addresses, count * sizeof(*addresses)); | |
1241 | if (!temp) { | |
1242 | count--; | |
1243 | goto out; | |
1244 | } | |
1245 | addresses = temp; | |
1246 | addresses[count - 1] = strdup(address); | |
1247 | } | |
1248 | ||
1249 | out: | |
1250 | if(interfaceArray) | |
1251 | freeifaddrs(interfaceArray); | |
1252 | ||
1253 | /* Switch back to original netns */ | |
1254 | if (old_netns >= 0 && setns(old_netns, CLONE_NEWNET)) | |
1255 | SYSERROR("failed to setns"); | |
1256 | if (new_netns >= 0) | |
1257 | close(new_netns); | |
1258 | if (old_netns >= 0) | |
1259 | close(old_netns); | |
1260 | ||
1261 | /* Append NULL to the array */ | |
1262 | if (count) { | |
1263 | count++; | |
1264 | temp = realloc(addresses, count * sizeof(*addresses)); | |
1265 | if (!temp) { | |
fca3080f DE |
1266 | int i; |
1267 | for (i = 0; i < count-1; i++) | |
9c83a661 SG |
1268 | free(addresses[i]); |
1269 | free(addresses); | |
1270 | return NULL; | |
1271 | } | |
1272 | addresses = temp; | |
1273 | addresses[count - 1] = NULL; | |
1274 | } | |
1275 | ||
1276 | return addresses; | |
1277 | } | |
1278 | ||
12a50cc6 | 1279 | static int lxcapi_get_config_item(struct lxc_container *c, const char *key, char *retv, int inlen) |
72d0e1cb SG |
1280 | { |
1281 | int ret; | |
1282 | ||
1283 | if (!c || !c->lxc_conf) | |
1284 | return -1; | |
5cee8c50 | 1285 | if (container_mem_lock(c)) |
72d0e1cb | 1286 | return -1; |
72d0e1cb | 1287 | ret = lxc_get_config_item(c->lxc_conf, key, retv, inlen); |
5cee8c50 | 1288 | container_mem_unlock(c); |
72d0e1cb SG |
1289 | return ret; |
1290 | } | |
1291 | ||
12a50cc6 | 1292 | static int lxcapi_get_keys(struct lxc_container *c, const char *key, char *retv, int inlen) |
72d0e1cb SG |
1293 | { |
1294 | if (!key) | |
1295 | return lxc_listconfigs(retv, inlen); | |
1296 | /* | |
1297 | * Support 'lxc.network.<idx>', i.e. 'lxc.network.0' | |
1298 | * This is an intelligent result to show which keys are valid given | |
1299 | * the type of nic it is | |
1300 | */ | |
1301 | if (!c || !c->lxc_conf) | |
1302 | return -1; | |
5cee8c50 | 1303 | if (container_mem_lock(c)) |
72d0e1cb SG |
1304 | return -1; |
1305 | int ret = -1; | |
1306 | if (strncmp(key, "lxc.network.", 12) == 0) | |
1307 | ret = lxc_list_nicconfigs(c->lxc_conf, key, retv, inlen); | |
5cee8c50 | 1308 | container_mem_unlock(c); |
72d0e1cb SG |
1309 | return ret; |
1310 | } | |
1311 | ||
12a50cc6 | 1312 | static bool lxcapi_save_config(struct lxc_container *c, const char *alt_file) |
72d0e1cb | 1313 | { |
39dc698c SH |
1314 | FILE *fout; |
1315 | bool ret = false, need_disklock = false; | |
1316 | int lret; | |
1317 | ||
72d0e1cb SG |
1318 | if (!alt_file) |
1319 | alt_file = c->configfile; | |
1320 | if (!alt_file) | |
1321 | return false; // should we write to stdout if no file is specified? | |
39dc698c SH |
1322 | |
1323 | // If we haven't yet loaded a config, load the stock config | |
1324 | if (!c->lxc_conf) { | |
72d0e1cb SG |
1325 | if (!c->load_config(c, LXC_DEFAULT_CONFIG)) { |
1326 | ERROR("Error loading default configuration file %s while saving %s\n", LXC_DEFAULT_CONFIG, c->name); | |
1327 | return false; | |
1328 | } | |
39dc698c | 1329 | } |
72d0e1cb | 1330 | |
5a3d2e1e SG |
1331 | if (!create_container_dir(c)) |
1332 | return false; | |
1333 | ||
39dc698c SH |
1334 | /* |
1335 | * If we're writing to the container's config file, take the | |
1336 | * disk lock. Otherwise just take the memlock to protect the | |
1337 | * struct lxc_container while we're traversing it. | |
1338 | */ | |
1339 | if (strcmp(c->configfile, alt_file) == 0) | |
1340 | need_disklock = true; | |
1341 | ||
1342 | if (need_disklock) | |
1343 | lret = container_disk_lock(c); | |
1344 | else | |
1345 | lret = container_mem_lock(c); | |
1346 | ||
1347 | if (lret) | |
72d0e1cb | 1348 | return false; |
39dc698c SH |
1349 | |
1350 | fout = fopen(alt_file, "w"); | |
1351 | if (!fout) | |
1352 | goto out; | |
72d0e1cb SG |
1353 | write_config(fout, c->lxc_conf); |
1354 | fclose(fout); | |
39dc698c SH |
1355 | ret = true; |
1356 | ||
1357 | out: | |
1358 | if (need_disklock) | |
1359 | container_disk_unlock(c); | |
1360 | else | |
1361 | container_mem_unlock(c); | |
1362 | return ret; | |
72d0e1cb SG |
1363 | } |
1364 | ||
60bf62d4 | 1365 | // do we want the api to support --force, or leave that to the caller? |
72d0e1cb SG |
1366 | static bool lxcapi_destroy(struct lxc_container *c) |
1367 | { | |
1897e3bc | 1368 | struct bdev *r = NULL; |
60bf62d4 | 1369 | bool ret = false; |
72d0e1cb | 1370 | |
1897e3bc | 1371 | if (!c || !lxcapi_is_defined(c)) |
5a3d2e1e SG |
1372 | return false; |
1373 | ||
3bc449ed | 1374 | if (container_disk_lock(c)) |
72d0e1cb | 1375 | return false; |
72d0e1cb | 1376 | |
39dc698c | 1377 | if (!is_stopped(c)) { |
60bf62d4 SH |
1378 | // we should queue some sort of error - in c->error_string? |
1379 | ERROR("container %s is not stopped", c->name); | |
1380 | goto out; | |
72d0e1cb SG |
1381 | } |
1382 | ||
3bc449ed | 1383 | if (c->lxc_conf && c->lxc_conf->rootfs.path && c->lxc_conf->rootfs.mount) |
1897e3bc | 1384 | r = bdev_init(c->lxc_conf->rootfs.path, c->lxc_conf->rootfs.mount, NULL); |
60bf62d4 SH |
1385 | if (r) { |
1386 | if (r->ops->destroy(r) < 0) { | |
1387 | ERROR("Error destroying rootfs for %s", c->name); | |
1388 | goto out; | |
1389 | } | |
1390 | } | |
1391 | ||
1392 | const char *p1 = lxcapi_get_config_path(c); | |
1393 | char *path = alloca(strlen(p1) + strlen(c->name) + 2); | |
1394 | sprintf(path, "%s/%s", p1, c->name); | |
1395 | if (lxc_rmdir_onedev(path) < 0) { | |
1396 | ERROR("Error destroying container directory for %s", c->name); | |
1397 | goto out; | |
1398 | } | |
1399 | ret = true; | |
1400 | ||
1401 | out: | |
3bc449ed | 1402 | container_disk_unlock(c); |
60bf62d4 | 1403 | return ret; |
72d0e1cb SG |
1404 | } |
1405 | ||
96532523 SH |
1406 | static bool set_config_item_locked(struct lxc_container *c, const char *key, const char *v) |
1407 | { | |
1408 | struct lxc_config_t *config; | |
1409 | ||
1410 | if (!c->lxc_conf) | |
1411 | c->lxc_conf = lxc_conf_init(); | |
1412 | if (!c->lxc_conf) | |
1413 | return false; | |
1414 | config = lxc_getconfig(key); | |
1415 | if (!config) | |
1416 | return false; | |
1417 | return (0 == config->cb(key, v, c->lxc_conf)); | |
1418 | } | |
1419 | ||
12a50cc6 | 1420 | static bool lxcapi_set_config_item(struct lxc_container *c, const char *key, const char *v) |
72d0e1cb | 1421 | { |
72d0e1cb | 1422 | bool b = false; |
72d0e1cb SG |
1423 | |
1424 | if (!c) | |
1425 | return false; | |
1426 | ||
5cee8c50 | 1427 | if (container_mem_lock(c)) |
72d0e1cb SG |
1428 | return false; |
1429 | ||
96532523 | 1430 | b = set_config_item_locked(c, key, v); |
72d0e1cb | 1431 | |
5cee8c50 | 1432 | container_mem_unlock(c); |
72d0e1cb SG |
1433 | return b; |
1434 | } | |
1435 | ||
1436 | static char *lxcapi_config_file_name(struct lxc_container *c) | |
1437 | { | |
1438 | if (!c || !c->configfile) | |
1439 | return NULL; | |
1440 | return strdup(c->configfile); | |
1441 | } | |
1442 | ||
2a59a681 SH |
1443 | static const char *lxcapi_get_config_path(struct lxc_container *c) |
1444 | { | |
1445 | if (!c || !c->config_path) | |
1446 | return NULL; | |
1447 | return (const char *)(c->config_path); | |
1448 | } | |
1449 | ||
afeecbba SH |
1450 | /* |
1451 | * not for export | |
1452 | * Just recalculate the c->configfile based on the | |
1453 | * c->config_path, which must be set. | |
1454 | * The lxc_container must be locked or not yet public. | |
1455 | */ | |
1456 | static bool set_config_filename(struct lxc_container *c) | |
1457 | { | |
1458 | char *newpath; | |
1459 | int len, ret; | |
1460 | ||
1461 | if (!c->config_path) | |
1462 | return false; | |
1463 | ||
1464 | /* $lxc_path + "/" + c->name + "/" + "config" + '\0' */ | |
1465 | len = strlen(c->config_path) + strlen(c->name) + strlen("config") + 3; | |
1466 | newpath = malloc(len); | |
1467 | if (!newpath) | |
1468 | return false; | |
1469 | ||
1470 | ret = snprintf(newpath, len, "%s/%s/config", c->config_path, c->name); | |
1471 | if (ret < 0 || ret >= len) { | |
1472 | fprintf(stderr, "Error printing out config file name\n"); | |
1473 | free(newpath); | |
1474 | return false; | |
1475 | } | |
1476 | ||
1477 | if (c->configfile) | |
1478 | free(c->configfile); | |
1479 | c->configfile = newpath; | |
1480 | ||
1481 | return true; | |
1482 | } | |
1483 | ||
2a59a681 SH |
1484 | static bool lxcapi_set_config_path(struct lxc_container *c, const char *path) |
1485 | { | |
1486 | char *p; | |
1487 | bool b = false; | |
afeecbba | 1488 | char *oldpath = NULL; |
2a59a681 SH |
1489 | |
1490 | if (!c) | |
1491 | return b; | |
1492 | ||
5cee8c50 | 1493 | if (container_mem_lock(c)) |
2a59a681 SH |
1494 | return b; |
1495 | ||
1496 | p = strdup(path); | |
afeecbba SH |
1497 | if (!p) { |
1498 | ERROR("Out of memory setting new lxc path"); | |
2a59a681 | 1499 | goto err; |
afeecbba SH |
1500 | } |
1501 | ||
2a59a681 SH |
1502 | b = true; |
1503 | if (c->config_path) | |
afeecbba | 1504 | oldpath = c->config_path; |
2a59a681 | 1505 | c->config_path = p; |
afeecbba SH |
1506 | |
1507 | /* Since we've changed the config path, we have to change the | |
1508 | * config file name too */ | |
1509 | if (!set_config_filename(c)) { | |
1510 | ERROR("Out of memory setting new config filename"); | |
1511 | b = false; | |
1512 | free(c->config_path); | |
1513 | c->config_path = oldpath; | |
1514 | oldpath = NULL; | |
1515 | } | |
2a59a681 | 1516 | err: |
afeecbba SH |
1517 | if (oldpath) |
1518 | free(oldpath); | |
5cee8c50 | 1519 | container_mem_unlock(c); |
2a59a681 SH |
1520 | return b; |
1521 | } | |
1522 | ||
1523 | ||
794dd120 SH |
1524 | static bool lxcapi_set_cgroup_item(struct lxc_container *c, const char *subsys, const char *value) |
1525 | { | |
1526 | int ret; | |
794dd120 SH |
1527 | |
1528 | if (!c) | |
1529 | return false; | |
1530 | ||
3bc449ed | 1531 | if (is_stopped(c)) |
794dd120 SH |
1532 | return false; |
1533 | ||
3bc449ed SH |
1534 | if (container_disk_lock(c)) |
1535 | return false; | |
794dd120 | 1536 | |
ef091cef | 1537 | ret = lxc_cgroup_set(c->name, subsys, value, c->config_path); |
3bc449ed SH |
1538 | |
1539 | container_disk_unlock(c); | |
1540 | return ret == 0; | |
794dd120 SH |
1541 | } |
1542 | ||
1543 | static int lxcapi_get_cgroup_item(struct lxc_container *c, const char *subsys, char *retv, int inlen) | |
1544 | { | |
3bc449ed | 1545 | int ret; |
794dd120 SH |
1546 | |
1547 | if (!c || !c->lxc_conf) | |
1548 | return -1; | |
1549 | ||
3bc449ed | 1550 | if (is_stopped(c)) |
794dd120 SH |
1551 | return -1; |
1552 | ||
3bc449ed SH |
1553 | if (container_disk_lock(c)) |
1554 | return -1; | |
794dd120 | 1555 | |
ae5c8b8e | 1556 | ret = lxc_cgroup_get(c->name, subsys, retv, inlen, c->config_path); |
794dd120 | 1557 | |
3bc449ed | 1558 | container_disk_unlock(c); |
794dd120 SH |
1559 | return ret; |
1560 | } | |
1561 | ||
67e571de | 1562 | const char *lxc_get_default_config_path(void) |
83c98d82 DE |
1563 | { |
1564 | return default_lxc_path(); | |
1565 | } | |
794dd120 | 1566 | |
a8428dfa SH |
1567 | const char *lxc_get_default_lvm_vg(void) |
1568 | { | |
1569 | return default_lvm_vg(); | |
1570 | } | |
1571 | ||
1572 | const char *lxc_get_default_zfs_root(void) | |
1573 | { | |
1574 | return default_zfs_root(); | |
1575 | } | |
1576 | ||
b6b918a1 SG |
1577 | const char *lxc_get_version(void) |
1578 | { | |
1579 | return lxc_version(); | |
1580 | } | |
1581 | ||
9be53773 SH |
1582 | static int copy_file(char *old, char *new) |
1583 | { | |
1584 | int in, out; | |
1585 | ssize_t len, ret; | |
1586 | char buf[8096]; | |
1587 | struct stat sbuf; | |
1588 | ||
1589 | if (file_exists(new)) { | |
1590 | ERROR("copy destination %s exists", new); | |
1591 | return -1; | |
1592 | } | |
1593 | ret = stat(old, &sbuf); | |
1594 | if (ret < 0) { | |
1595 | SYSERROR("stat'ing %s", old); | |
1596 | return -1; | |
1597 | } | |
1598 | ||
1599 | in = open(old, O_RDONLY); | |
1600 | if (in < 0) { | |
1601 | SYSERROR("opening original file %s", old); | |
1602 | return -1; | |
1603 | } | |
1604 | out = open(new, O_CREAT | O_EXCL | O_WRONLY, 0644); | |
1605 | if (out < 0) { | |
1606 | SYSERROR("opening new file %s", new); | |
1607 | close(in); | |
1608 | return -1; | |
1609 | } | |
1610 | ||
1611 | while (1) { | |
1612 | len = read(in, buf, 8096); | |
1613 | if (len < 0) { | |
1614 | SYSERROR("reading old file %s", old); | |
1615 | goto err; | |
1616 | } | |
1617 | if (len == 0) | |
1618 | break; | |
1619 | ret = write(out, buf, len); | |
1620 | if (ret < len) { // should we retry? | |
1621 | SYSERROR("write to new file %s was interrupted", new); | |
1622 | goto err; | |
1623 | } | |
1624 | } | |
1625 | close(in); | |
1626 | close(out); | |
1627 | ||
1628 | // we set mode, but not owner/group | |
1629 | ret = chmod(new, sbuf.st_mode); | |
1630 | if (ret) { | |
1631 | SYSERROR("setting mode on %s", new); | |
1632 | return -1; | |
1633 | } | |
1634 | ||
1635 | return 0; | |
1636 | ||
1637 | err: | |
1638 | close(in); | |
1639 | close(out); | |
1640 | return -1; | |
1641 | } | |
1642 | ||
9be53773 SH |
1643 | static int copyhooks(struct lxc_container *oldc, struct lxc_container *c) |
1644 | { | |
1645 | int i; | |
1646 | int ret; | |
1647 | struct lxc_list *it; | |
1648 | ||
1649 | for (i=0; i<NUM_LXC_HOOKS; i++) { | |
1650 | lxc_list_for_each(it, &c->lxc_conf->hooks[i]) { | |
1651 | char *hookname = it->elem; | |
c32981c3 | 1652 | char *fname = strrchr(hookname, '/'); |
9be53773 SH |
1653 | char tmppath[MAXPATHLEN]; |
1654 | if (!fname) // relative path - we don't support, but maybe we should | |
1655 | return 0; | |
1656 | // copy the script, and change the entry in confile | |
1657 | ret = snprintf(tmppath, MAXPATHLEN, "%s/%s/%s", | |
1658 | c->config_path, c->name, fname+1); | |
1659 | if (ret < 0 || ret >= MAXPATHLEN) | |
1660 | return -1; | |
1661 | ret = copy_file(it->elem, tmppath); | |
1662 | if (ret < 0) | |
1663 | return -1; | |
1664 | free(it->elem); | |
1665 | it->elem = strdup(tmppath); | |
1666 | if (!it->elem) { | |
1667 | ERROR("out of memory copying hook path"); | |
1668 | return -1; | |
1669 | } | |
9be53773 SH |
1670 | } |
1671 | } | |
1672 | ||
1673 | c->save_config(c, NULL); | |
1674 | return 0; | |
1675 | } | |
1676 | ||
1677 | static void new_hwaddr(char *hwaddr) | |
1678 | { | |
1679 | FILE *f = fopen("/dev/urandom", "r"); | |
1680 | if (f) { | |
1681 | unsigned int seed; | |
1682 | int ret = fread(&seed, sizeof(seed), 1, f); | |
1683 | if (ret != 1) | |
1684 | seed = time(NULL); | |
1685 | fclose(f); | |
1686 | srand(seed); | |
1687 | } else | |
1688 | srand(time(NULL)); | |
1689 | snprintf(hwaddr, 18, "00:16:3e:%02x:%02x:%02x", | |
1690 | rand() % 255, rand() % 255, rand() % 255); | |
1691 | } | |
1692 | ||
1693 | static void network_new_hwaddrs(struct lxc_container *c) | |
1694 | { | |
1695 | struct lxc_list *it; | |
1696 | ||
1697 | lxc_list_for_each(it, &c->lxc_conf->network) { | |
1698 | struct lxc_netdev *n = it->elem; | |
1699 | if (n->hwaddr) | |
1700 | new_hwaddr(n->hwaddr); | |
1701 | } | |
1702 | } | |
1703 | ||
1704 | static int copy_fstab(struct lxc_container *oldc, struct lxc_container *c) | |
1705 | { | |
1706 | char newpath[MAXPATHLEN]; | |
1707 | char *oldpath = oldc->lxc_conf->fstab; | |
1708 | int ret; | |
1709 | ||
1710 | if (!oldpath) | |
1711 | return 0; | |
1712 | ||
c32981c3 | 1713 | char *p = strrchr(oldpath, '/'); |
9be53773 SH |
1714 | if (!p) |
1715 | return -1; | |
1716 | ret = snprintf(newpath, MAXPATHLEN, "%s/%s%s", | |
1717 | c->config_path, c->name, p); | |
1718 | if (ret < 0 || ret >= MAXPATHLEN) { | |
1719 | ERROR("error printing new path for %s", oldpath); | |
1720 | return -1; | |
1721 | } | |
1722 | if (file_exists(newpath)) { | |
1723 | ERROR("error: fstab file %s exists", newpath); | |
1724 | return -1; | |
1725 | } | |
1726 | ||
1727 | if (copy_file(oldpath, newpath) < 0) { | |
1728 | ERROR("error: copying %s to %s", oldpath, newpath); | |
1729 | return -1; | |
1730 | } | |
1731 | free(c->lxc_conf->fstab); | |
1732 | c->lxc_conf->fstab = strdup(newpath); | |
1733 | if (!c->lxc_conf->fstab) { | |
1734 | ERROR("error: allocating pathname"); | |
1735 | return -1; | |
1736 | } | |
1737 | ||
1738 | return 0; | |
1739 | } | |
1740 | ||
1741 | static int copy_storage(struct lxc_container *c0, struct lxc_container *c, | |
1742 | const char *newtype, int flags, const char *bdevdata, unsigned long newsize) | |
1743 | { | |
1744 | struct bdev *bdev; | |
1745 | ||
1746 | bdev = bdev_copy(c0->lxc_conf->rootfs.path, c0->name, c->name, | |
1747 | c0->config_path, c->config_path, newtype, !!(flags & LXC_CLONE_SNAPSHOT), | |
1748 | bdevdata, newsize); | |
1749 | if (!bdev) { | |
1750 | ERROR("error copying storage"); | |
1751 | return -1; | |
1752 | } | |
1753 | free(c->lxc_conf->rootfs.path); | |
1754 | c->lxc_conf->rootfs.path = strdup(bdev->src); | |
1755 | bdev_put(bdev); | |
1756 | if (!c->lxc_conf->rootfs.path) | |
1757 | return -1; | |
1758 | // here we could also update all lxc.mount.entries or even | |
1759 | // items in the lxc.mount fstab list. As discussed on m-l, | |
1760 | // we could do either any source paths starting with the | |
1761 | // lxcpath/oldname, or simply anythign which is not a virtual | |
1762 | // fs or a bind mount. | |
1763 | return 0; | |
1764 | } | |
1765 | ||
1143ed39 DE |
1766 | static int clone_update_rootfs(struct lxc_container *c0, |
1767 | struct lxc_container *c, int flags, | |
1768 | char **hookargs) | |
9be53773 SH |
1769 | { |
1770 | int ret = -1; | |
1771 | char path[MAXPATHLEN]; | |
1772 | struct bdev *bdev; | |
1773 | FILE *fout; | |
1774 | pid_t pid; | |
148e91f5 | 1775 | struct lxc_conf *conf = c->lxc_conf; |
9be53773 SH |
1776 | |
1777 | /* update hostname in rootfs */ | |
1778 | /* we're going to mount, so run in a clean namespace to simplify cleanup */ | |
1779 | ||
1780 | pid = fork(); | |
1781 | if (pid < 0) | |
1782 | return -1; | |
1783 | if (pid > 0) | |
1784 | return wait_for_pid(pid); | |
1785 | ||
1786 | if (unshare(CLONE_NEWNS) < 0) { | |
1787 | ERROR("error unsharing mounts"); | |
1788 | exit(1); | |
1789 | } | |
1790 | bdev = bdev_init(c->lxc_conf->rootfs.path, c->lxc_conf->rootfs.mount, NULL); | |
1791 | if (!bdev) | |
1792 | exit(1); | |
1793 | if (bdev->ops->mount(bdev) < 0) | |
1794 | exit(1); | |
148e91f5 SH |
1795 | |
1796 | if (!lxc_list_empty(&conf->hooks[LXCHOOK_CLONE])) { | |
1797 | /* Start of environment variable setup for hooks */ | |
1143ed39 DE |
1798 | if (setenv("LXC_SRC_NAME", c0->name, 1)) { |
1799 | SYSERROR("failed to set environment variable for source container name"); | |
1800 | } | |
148e91f5 SH |
1801 | if (setenv("LXC_NAME", c->name, 1)) { |
1802 | SYSERROR("failed to set environment variable for container name"); | |
1803 | } | |
1804 | if (setenv("LXC_CONFIG_FILE", conf->rcfile, 1)) { | |
1805 | SYSERROR("failed to set environment variable for config path"); | |
1806 | } | |
1807 | if (setenv("LXC_ROOTFS_MOUNT", conf->rootfs.mount, 1)) { | |
1808 | SYSERROR("failed to set environment variable for rootfs mount"); | |
1809 | } | |
1810 | if (setenv("LXC_ROOTFS_PATH", conf->rootfs.path, 1)) { | |
1811 | SYSERROR("failed to set environment variable for rootfs mount"); | |
1812 | } | |
1813 | ||
283678ed | 1814 | if (run_lxc_hooks(c->name, "clone", conf, c->get_config_path(c), hookargs)) { |
148e91f5 SH |
1815 | ERROR("Error executing clone hook for %s", c->name); |
1816 | exit(1); | |
1817 | } | |
1818 | } | |
1819 | ||
1820 | if (!(flags & LXC_CLONE_KEEPNAME)) { | |
1821 | ret = snprintf(path, MAXPATHLEN, "%s/etc/hostname", bdev->dest); | |
1822 | if (ret < 0 || ret >= MAXPATHLEN) | |
1823 | exit(1); | |
8058be39 DE |
1824 | if (!file_exists(path)) |
1825 | exit(0); | |
148e91f5 SH |
1826 | if (!(fout = fopen(path, "w"))) { |
1827 | SYSERROR("unable to open %s: ignoring\n", path); | |
1828 | exit(0); | |
1829 | } | |
1830 | if (fprintf(fout, "%s", c->name) < 0) | |
1831 | exit(1); | |
1832 | if (fclose(fout) < 0) | |
1833 | exit(1); | |
9be53773 | 1834 | } |
9be53773 SH |
1835 | exit(0); |
1836 | } | |
1837 | ||
1838 | /* | |
1839 | * We want to support: | |
1840 | sudo lxc-clone -o o1 -n n1 -s -L|-fssize fssize -v|--vgname vgname \ | |
1841 | -p|--lvprefix lvprefix -t|--fstype fstype -B backingstore | |
1842 | ||
1843 | -s [ implies overlayfs] | |
1844 | -s -B overlayfs | |
1845 | -s -B aufs | |
1846 | ||
1847 | only rootfs gets converted (copied/snapshotted) on clone. | |
1848 | */ | |
1849 | ||
1850 | static int create_file_dirname(char *path) | |
1851 | { | |
c32981c3 | 1852 | char *p = strrchr(path, '/'); |
9be53773 SH |
1853 | int ret; |
1854 | ||
1855 | if (!p) | |
1856 | return -1; | |
1857 | *p = '\0'; | |
1858 | ret = mkdir(path, 0755); | |
1859 | if (ret && errno != EEXIST) | |
1860 | SYSERROR("creating container path %s\n", path); | |
1861 | *p = '/'; | |
1862 | return ret; | |
1863 | } | |
1864 | ||
1865 | struct lxc_container *lxcapi_clone(struct lxc_container *c, const char *newname, | |
1866 | const char *lxcpath, int flags, | |
148e91f5 SH |
1867 | const char *bdevtype, const char *bdevdata, unsigned long newsize, |
1868 | char **hookargs) | |
9be53773 SH |
1869 | { |
1870 | struct lxc_container *c2 = NULL; | |
1871 | char newpath[MAXPATHLEN]; | |
176d9acb | 1872 | int ret, storage_copied = 0; |
9be53773 SH |
1873 | const char *n, *l; |
1874 | FILE *fout; | |
1875 | ||
1876 | if (!c || !c->is_defined(c)) | |
1877 | return NULL; | |
1878 | ||
5cee8c50 | 1879 | if (container_mem_lock(c)) |
9be53773 SH |
1880 | return NULL; |
1881 | ||
39dc698c | 1882 | if (!is_stopped(c)) { |
9be53773 SH |
1883 | ERROR("error: Original container (%s) is running", c->name); |
1884 | goto out; | |
1885 | } | |
1886 | ||
1887 | // Make sure the container doesn't yet exist. | |
1888 | n = newname ? newname : c->name; | |
1889 | l = lxcpath ? lxcpath : c->get_config_path(c); | |
1890 | ret = snprintf(newpath, MAXPATHLEN, "%s/%s/config", l, n); | |
1891 | if (ret < 0 || ret >= MAXPATHLEN) { | |
1892 | SYSERROR("clone: failed making config pathname"); | |
1893 | goto out; | |
1894 | } | |
1895 | if (file_exists(newpath)) { | |
1896 | ERROR("error: clone: %s exists", newpath); | |
1897 | goto out; | |
1898 | } | |
1899 | ||
96532523 SH |
1900 | ret = create_file_dirname(newpath); |
1901 | if (ret < 0 && errno != EEXIST) { | |
9be53773 SH |
1902 | ERROR("Error creating container dir for %s", newpath); |
1903 | goto out; | |
1904 | } | |
1905 | ||
1906 | // copy the configuration, tweak it as needed, | |
1907 | fout = fopen(newpath, "w"); | |
1908 | if (!fout) { | |
1909 | SYSERROR("open %s", newpath); | |
1910 | goto out; | |
1911 | } | |
1912 | write_config(fout, c->lxc_conf); | |
1913 | fclose(fout); | |
1914 | ||
9be53773 SH |
1915 | sprintf(newpath, "%s/%s/rootfs", l, n); |
1916 | if (mkdir(newpath, 0755) < 0) { | |
1917 | SYSERROR("error creating %s", newpath); | |
1918 | goto out; | |
1919 | } | |
1920 | ||
1921 | c2 = lxc_container_new(n, l); | |
375c2258 | 1922 | if (!c2) { |
9be53773 SH |
1923 | ERROR("clone: failed to create new container (%s %s)", n, l); |
1924 | goto out; | |
1925 | } | |
1926 | ||
96532523 SH |
1927 | // update utsname |
1928 | if (!set_config_item_locked(c2, "lxc.utsname", newname)) { | |
1929 | ERROR("Error setting new hostname"); | |
1930 | goto out; | |
1931 | } | |
1932 | ||
1933 | ||
9be53773 SH |
1934 | // copy hooks if requested |
1935 | if (flags & LXC_CLONE_COPYHOOKS) { | |
1936 | ret = copyhooks(c, c2); | |
1937 | if (ret < 0) { | |
1938 | ERROR("error copying hooks"); | |
9be53773 SH |
1939 | goto out; |
1940 | } | |
1941 | } | |
1942 | ||
1943 | if (copy_fstab(c, c2) < 0) { | |
1944 | ERROR("error copying fstab"); | |
9be53773 SH |
1945 | goto out; |
1946 | } | |
1947 | ||
1948 | // update macaddrs | |
1949 | if (!(flags & LXC_CLONE_KEEPMACADDR)) | |
1950 | network_new_hwaddrs(c2); | |
1951 | ||
1952 | // copy/snapshot rootfs's | |
1953 | ret = copy_storage(c, c2, bdevtype, flags, bdevdata, newsize); | |
375c2258 | 1954 | if (ret < 0) |
9be53773 | 1955 | goto out; |
9be53773 | 1956 | |
176d9acb SH |
1957 | // We've now successfully created c2's storage, so clear it out if we |
1958 | // fail after this | |
1959 | storage_copied = 1; | |
1960 | ||
375c2258 | 1961 | if (!c2->save_config(c2, NULL)) |
9be53773 | 1962 | goto out; |
9be53773 | 1963 | |
1143ed39 | 1964 | if (clone_update_rootfs(c, c2, flags, hookargs) < 0) |
9be53773 | 1965 | goto out; |
9be53773 SH |
1966 | |
1967 | // TODO: update c's lxc.snapshot = count | |
5cee8c50 | 1968 | container_mem_unlock(c); |
9be53773 SH |
1969 | return c2; |
1970 | ||
1971 | out: | |
5cee8c50 | 1972 | container_mem_unlock(c); |
375c2258 | 1973 | if (c2) { |
176d9acb SH |
1974 | if (!storage_copied) |
1975 | c2->lxc_conf->rootfs.path = NULL; | |
375c2258 | 1976 | c2->destroy(c2); |
9be53773 | 1977 | lxc_container_put(c2); |
375c2258 | 1978 | } |
9be53773 SH |
1979 | |
1980 | return NULL; | |
1981 | } | |
1982 | ||
a0e93eeb CS |
1983 | static int lxcapi_attach(struct lxc_container *c, lxc_attach_exec_t exec_function, void *exec_payload, lxc_attach_options_t *options, pid_t *attached_process) |
1984 | { | |
1985 | if (!c) | |
1986 | return -1; | |
1987 | ||
1988 | return lxc_attach(c->name, c->config_path, exec_function, exec_payload, options, attached_process); | |
1989 | } | |
1990 | ||
1991 | static int lxcapi_attach_run_wait(struct lxc_container *c, lxc_attach_options_t *options, const char *program, const char * const argv[]) | |
1992 | { | |
1993 | lxc_attach_command_t command; | |
1994 | pid_t pid; | |
1995 | int r; | |
1996 | ||
1997 | if (!c) | |
1998 | return -1; | |
1999 | ||
2000 | command.program = (char*)program; | |
2001 | command.argv = (char**)argv; | |
2002 | r = lxc_attach(c->name, c->config_path, lxc_attach_run_command, &command, options, &pid); | |
2003 | if (r < 0) { | |
2004 | ERROR("ups"); | |
2005 | return r; | |
2006 | } | |
2007 | return lxc_wait_for_pid_status(pid); | |
2008 | } | |
2009 | ||
2010 | static int lxcapi_attach_run_waitl(struct lxc_container *c, lxc_attach_options_t *options, const char *program, const char *arg, ...) | |
2011 | { | |
2012 | va_list ap; | |
2013 | const char **argv; | |
2014 | int ret; | |
2015 | ||
2016 | if (!c) | |
2017 | return -1; | |
2018 | ||
2019 | va_start(ap, arg); | |
2020 | argv = lxc_va_arg_list_to_argv_const(ap, 1); | |
2021 | va_end(ap); | |
2022 | ||
2023 | if (!argv) { | |
2024 | ERROR("Memory allocation error."); | |
2025 | return -1; | |
2026 | } | |
2027 | argv[0] = arg; | |
2028 | ||
2029 | ret = lxcapi_attach_run_wait(c, options, program, (const char * const *)argv); | |
2030 | free((void*)argv); | |
2031 | return ret; | |
2032 | } | |
2033 | ||
afeecbba | 2034 | struct lxc_container *lxc_container_new(const char *name, const char *configpath) |
72d0e1cb SG |
2035 | { |
2036 | struct lxc_container *c; | |
72d0e1cb SG |
2037 | |
2038 | c = malloc(sizeof(*c)); | |
2039 | if (!c) { | |
2040 | fprintf(stderr, "failed to malloc lxc_container\n"); | |
2041 | return NULL; | |
2042 | } | |
2043 | memset(c, 0, sizeof(*c)); | |
2044 | ||
afeecbba SH |
2045 | if (configpath) |
2046 | c->config_path = strdup(configpath); | |
2047 | else | |
67e571de | 2048 | c->config_path = strdup(default_lxc_path()); |
afeecbba | 2049 | |
2a59a681 SH |
2050 | if (!c->config_path) { |
2051 | fprintf(stderr, "Out of memory"); | |
2052 | goto err; | |
2053 | } | |
2054 | ||
72d0e1cb SG |
2055 | c->name = malloc(strlen(name)+1); |
2056 | if (!c->name) { | |
2057 | fprintf(stderr, "Error allocating lxc_container name\n"); | |
2058 | goto err; | |
2059 | } | |
2060 | strcpy(c->name, name); | |
2061 | ||
2062 | c->numthreads = 1; | |
df271a59 | 2063 | if (!(c->slock = lxc_newlock(c->config_path, name))) { |
72d0e1cb SG |
2064 | fprintf(stderr, "failed to create lock\n"); |
2065 | goto err; | |
2066 | } | |
2067 | ||
df271a59 | 2068 | if (!(c->privlock = lxc_newlock(NULL, NULL))) { |
72d0e1cb SG |
2069 | fprintf(stderr, "failed to alloc privlock\n"); |
2070 | goto err; | |
2071 | } | |
2072 | ||
afeecbba | 2073 | if (!set_config_filename(c)) { |
72d0e1cb SG |
2074 | fprintf(stderr, "Error allocating config file pathname\n"); |
2075 | goto err; | |
2076 | } | |
72d0e1cb SG |
2077 | |
2078 | if (file_exists(c->configfile)) | |
2079 | lxcapi_load_config(c, NULL); | |
2080 | ||
3e625e2d SH |
2081 | if (ongoing_create(c) == 2) { |
2082 | ERROR("Error: %s creation was not completed", c->name); | |
1897e3bc SH |
2083 | lxcapi_destroy(c); |
2084 | lxc_conf_free(c->lxc_conf); | |
2085 | c->lxc_conf = NULL; | |
3e625e2d SH |
2086 | } |
2087 | ||
72d0e1cb SG |
2088 | // assign the member functions |
2089 | c->is_defined = lxcapi_is_defined; | |
2090 | c->state = lxcapi_state; | |
2091 | c->is_running = lxcapi_is_running; | |
2092 | c->freeze = lxcapi_freeze; | |
2093 | c->unfreeze = lxcapi_unfreeze; | |
0115f8fd | 2094 | c->console = lxcapi_console; |
b5159817 | 2095 | c->console_getfd = lxcapi_console_getfd; |
72d0e1cb SG |
2096 | c->init_pid = lxcapi_init_pid; |
2097 | c->load_config = lxcapi_load_config; | |
2098 | c->want_daemonize = lxcapi_want_daemonize; | |
2099 | c->start = lxcapi_start; | |
2100 | c->startl = lxcapi_startl; | |
2101 | c->stop = lxcapi_stop; | |
2102 | c->config_file_name = lxcapi_config_file_name; | |
2103 | c->wait = lxcapi_wait; | |
2104 | c->set_config_item = lxcapi_set_config_item; | |
2105 | c->destroy = lxcapi_destroy; | |
2106 | c->save_config = lxcapi_save_config; | |
2107 | c->get_keys = lxcapi_get_keys; | |
2108 | c->create = lxcapi_create; | |
2109 | c->createl = lxcapi_createl; | |
2110 | c->shutdown = lxcapi_shutdown; | |
3e625e2d | 2111 | c->reboot = lxcapi_reboot; |
72d0e1cb SG |
2112 | c->clear_config_item = lxcapi_clear_config_item; |
2113 | c->get_config_item = lxcapi_get_config_item; | |
794dd120 SH |
2114 | c->get_cgroup_item = lxcapi_get_cgroup_item; |
2115 | c->set_cgroup_item = lxcapi_set_cgroup_item; | |
2a59a681 SH |
2116 | c->get_config_path = lxcapi_get_config_path; |
2117 | c->set_config_path = lxcapi_set_config_path; | |
9be53773 | 2118 | c->clone = lxcapi_clone; |
9c83a661 | 2119 | c->get_ips = lxcapi_get_ips; |
a0e93eeb CS |
2120 | c->attach = lxcapi_attach; |
2121 | c->attach_run_wait = lxcapi_attach_run_wait; | |
2122 | c->attach_run_waitl = lxcapi_attach_run_waitl; | |
72d0e1cb SG |
2123 | |
2124 | /* we'll allow the caller to update these later */ | |
ab1bf971 | 2125 | if (lxc_log_init(NULL, "none", NULL, "lxc_container", 0, c->config_path)) { |
72d0e1cb SG |
2126 | fprintf(stderr, "failed to open log\n"); |
2127 | goto err; | |
2128 | } | |
2129 | ||
72d0e1cb SG |
2130 | return c; |
2131 | ||
2132 | err: | |
2133 | lxc_container_free(c); | |
2134 | return NULL; | |
2135 | } | |
2136 | ||
4a7c7daa | 2137 | int lxc_get_wait_states(const char **states) |
72d0e1cb SG |
2138 | { |
2139 | int i; | |
2140 | ||
2141 | if (states) | |
2142 | for (i=0; i<MAX_STATE; i++) | |
2143 | states[i] = lxc_state2str(i); | |
2144 | return MAX_STATE; | |
2145 | } |