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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 | * | |
d75462e4 SH |
6 | * This library is free software; you can redistribute it and/or |
7 | * modify it under the terms of the GNU Lesser General Public | |
8 | * License as published by the Free Software Foundation; either | |
9 | * version 2.1 of the License, or (at your option) any later version. | |
10 | ||
11 | * This library is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | * Lesser General Public License for more details. | |
15 | ||
16 | * You should have received a copy of the GNU Lesser General Public | |
17 | * License along with this library; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
72d0e1cb SG |
19 | */ |
20 | ||
9be53773 | 21 | #define _GNU_SOURCE |
148a9d27 | 22 | #include <assert.h> |
a0e93eeb | 23 | #include <stdarg.h> |
71454076 | 24 | #include <pthread.h> |
9be53773 SH |
25 | #include <unistd.h> |
26 | #include <sys/types.h> | |
27 | #include <sys/wait.h> | |
4de2791f | 28 | #include <sys/mount.h> |
9be53773 | 29 | #include <errno.h> |
93dc5327 | 30 | #include <fcntl.h> |
9be53773 | 31 | #include <sched.h> |
f5dd1d53 | 32 | #include <dirent.h> |
9be53773 | 33 | #include "config.h" |
72d0e1cb SG |
34 | #include "lxc.h" |
35 | #include "state.h" | |
948955a2 | 36 | #include <lxc/lxccontainer.h> |
72d0e1cb | 37 | #include "conf.h" |
72d0e1cb | 38 | #include "confile.h" |
b5159817 | 39 | #include "console.h" |
72d0e1cb SG |
40 | #include "cgroup.h" |
41 | #include "commands.h" | |
b6b918a1 | 42 | #include "version.h" |
72d0e1cb | 43 | #include "log.h" |
9be53773 | 44 | #include "bdev.h" |
6a44839f | 45 | #include "utils.h" |
a0e93eeb | 46 | #include "attach.h" |
2a59a681 | 47 | #include <lxc/utils.h> |
e51d4895 | 48 | #include <lxc/monitor.h> |
e768f9c0 | 49 | #include <lxc/namespace.h> |
9c83a661 | 50 | #include <sched.h> |
9c83a661 | 51 | #include <arpa/inet.h> |
a9a0ed90 | 52 | #include <libgen.h> |
4ba0d9af SG |
53 | |
54 | #if HAVE_IFADDRS_H | |
9c83a661 | 55 | #include <ifaddrs.h> |
4ba0d9af SG |
56 | #else |
57 | #include <../include/ifaddrs.h> | |
58 | #endif | |
72d0e1cb | 59 | |
dfb31b25 SH |
60 | #ifndef HAVE_GETLINE |
61 | #ifdef HAVE_FGETLN | |
62 | #include <../include/getline.h> | |
63 | #endif | |
64 | #endif | |
65 | ||
a9a0ed90 ÇO |
66 | #define MAX_BUFFER 4096 |
67 | ||
72d0e1cb SG |
68 | lxc_log_define(lxc_container, lxc); |
69 | ||
3e625e2d SH |
70 | static bool file_exists(char *f) |
71 | { | |
72 | struct stat statbuf; | |
73 | ||
74 | return stat(f, &statbuf) == 0; | |
75 | } | |
76 | ||
a41f104b SH |
77 | static bool config_file_exists(const char *lxcpath, const char *cname) |
78 | { | |
79 | /* $lxcpath + '/' + $cname + '/config' + \0 */ | |
80 | int ret, len = strlen(lxcpath) + strlen(cname) + 9; | |
81 | char *fname = alloca(len); | |
82 | ||
83 | ret = snprintf(fname, len, "%s/%s/config", lxcpath, cname); | |
84 | if (ret < 0 || ret >= len) | |
85 | return false; | |
86 | ||
87 | return file_exists(fname); | |
88 | } | |
89 | ||
3e625e2d SH |
90 | /* |
91 | * A few functions to help detect when a container creation failed. | |
92 | * If a container creation was killed partway through, then trying | |
93 | * to actually start that container could harm the host. We detect | |
94 | * this by creating a 'partial' file under the container directory, | |
95 | * and keeping an advisory lock. When container creation completes, | |
96 | * we remove that file. When we load or try to start a container, if | |
97 | * we find that file, without a flock, we remove the container. | |
98 | */ | |
99 | int ongoing_create(struct lxc_container *c) | |
100 | { | |
101 | int len = strlen(c->config_path) + strlen(c->name) + 10; | |
102 | char *path = alloca(len); | |
103 | int fd, ret; | |
93dc5327 SH |
104 | struct flock lk; |
105 | ||
3e625e2d SH |
106 | ret = snprintf(path, len, "%s/%s/partial", c->config_path, c->name); |
107 | if (ret < 0 || ret >= len) { | |
108 | ERROR("Error writing partial pathname"); | |
109 | return -1; | |
110 | } | |
111 | ||
112 | if (!file_exists(path)) | |
113 | return 0; | |
025ed0f3 SH |
114 | process_lock(); |
115 | fd = open(path, O_RDWR); | |
116 | process_unlock(); | |
117 | if (fd < 0) { | |
3e625e2d SH |
118 | // give benefit of the doubt |
119 | SYSERROR("Error opening partial file"); | |
3e625e2d SH |
120 | return 0; |
121 | } | |
93dc5327 SH |
122 | lk.l_type = F_WRLCK; |
123 | lk.l_whence = SEEK_SET; | |
124 | lk.l_start = 0; | |
125 | lk.l_len = 0; | |
126 | lk.l_pid = -1; | |
127 | if (fcntl(fd, F_GETLK, &lk) == 0 && lk.l_pid != -1) { | |
3e625e2d | 128 | // create is still ongoing |
025ed0f3 | 129 | process_lock(); |
3e625e2d SH |
130 | close(fd); |
131 | process_unlock(); | |
132 | return 1; | |
133 | } | |
134 | // create completed but partial is still there. | |
025ed0f3 | 135 | process_lock(); |
3e625e2d SH |
136 | close(fd); |
137 | process_unlock(); | |
138 | return 2; | |
139 | } | |
140 | ||
141 | int create_partial(struct lxc_container *c) | |
142 | { | |
143 | // $lxcpath + '/' + $name + '/partial' + \0 | |
144 | int len = strlen(c->config_path) + strlen(c->name) + 10; | |
145 | char *path = alloca(len); | |
146 | int fd, ret; | |
93dc5327 SH |
147 | struct flock lk; |
148 | ||
3e625e2d SH |
149 | ret = snprintf(path, len, "%s/%s/partial", c->config_path, c->name); |
150 | if (ret < 0 || ret >= len) { | |
151 | ERROR("Error writing partial pathname"); | |
152 | return -1; | |
153 | } | |
025ed0f3 | 154 | process_lock(); |
93dc5327 | 155 | if ((fd=open(path, O_RDWR | O_CREAT | O_EXCL, 0755)) < 0) { |
3e625e2d SH |
156 | SYSERROR("Erorr creating partial file"); |
157 | process_unlock(); | |
158 | return -1; | |
159 | } | |
93dc5327 SH |
160 | lk.l_type = F_WRLCK; |
161 | lk.l_whence = SEEK_SET; | |
162 | lk.l_start = 0; | |
163 | lk.l_len = 0; | |
164 | if (fcntl(fd, F_SETLKW, &lk) < 0) { | |
3e625e2d SH |
165 | SYSERROR("Error locking partial file %s", path); |
166 | close(fd); | |
167 | process_unlock(); | |
168 | return -1; | |
169 | } | |
170 | process_unlock(); | |
171 | ||
172 | return fd; | |
173 | } | |
174 | ||
175 | void remove_partial(struct lxc_container *c, int fd) | |
176 | { | |
177 | // $lxcpath + '/' + $name + '/partial' + \0 | |
178 | int len = strlen(c->config_path) + strlen(c->name) + 10; | |
179 | char *path = alloca(len); | |
180 | int ret; | |
181 | ||
025ed0f3 | 182 | process_lock(); |
3e625e2d | 183 | close(fd); |
025ed0f3 | 184 | process_unlock(); |
3e625e2d SH |
185 | ret = snprintf(path, len, "%s/%s/partial", c->config_path, c->name); |
186 | if (ret < 0 || ret >= len) { | |
187 | ERROR("Error writing partial pathname"); | |
188 | return; | |
189 | } | |
3e625e2d SH |
190 | if (unlink(path) < 0) |
191 | SYSERROR("Error unlink partial file %s", path); | |
3e625e2d SH |
192 | } |
193 | ||
72d0e1cb | 194 | /* LOCKING |
3bc449ed SH |
195 | * 1. container_mem_lock(c) protects the struct lxc_container from multiple threads. |
196 | * 2. container_disk_lock(c) protects the on-disk container data - in particular the | |
197 | * container configuration file. | |
198 | * The container_disk_lock also takes the container_mem_lock. | |
199 | * 3. thread_mutex protects process data (ex: fd table) from multiple threads. | |
72d0e1cb SG |
200 | * NOTHING mutexes two independent programs with their own struct |
201 | * lxc_container for the same c->name, between API calls. For instance, | |
202 | * c->config_read(); c->start(); Between those calls, data on disk | |
203 | * could change (which shouldn't bother the caller unless for instance | |
204 | * the rootfs get moved). c->config_read(); update; c->config_write(); | |
205 | * Two such updaters could race. The callers should therefore check their | |
206 | * results. Trying to prevent that would necessarily expose us to deadlocks | |
207 | * due to hung callers. So I prefer to keep the locks only within our own | |
208 | * functions, not across functions. | |
209 | * | |
3bc449ed | 210 | * If you're going to clone while holding a lxccontainer, increment |
72d0e1cb SG |
211 | * c->numthreads (under privlock) before forking. When deleting, |
212 | * decrement numthreads under privlock, then if it hits 0 you can delete. | |
213 | * Do not ever use a lxccontainer whose numthreads you did not bump. | |
214 | */ | |
215 | ||
216 | static void lxc_container_free(struct lxc_container *c) | |
217 | { | |
218 | if (!c) | |
219 | return; | |
220 | ||
221 | if (c->configfile) { | |
222 | free(c->configfile); | |
223 | c->configfile = NULL; | |
224 | } | |
225 | if (c->error_string) { | |
226 | free(c->error_string); | |
227 | c->error_string = NULL; | |
228 | } | |
d95db067 | 229 | if (c->slock) { |
df271a59 | 230 | lxc_putlock(c->slock); |
d95db067 DE |
231 | c->slock = NULL; |
232 | } | |
72d0e1cb | 233 | if (c->privlock) { |
df271a59 | 234 | lxc_putlock(c->privlock); |
72d0e1cb SG |
235 | c->privlock = NULL; |
236 | } | |
237 | if (c->name) { | |
238 | free(c->name); | |
239 | c->name = NULL; | |
240 | } | |
d95db067 DE |
241 | if (c->lxc_conf) { |
242 | lxc_conf_free(c->lxc_conf); | |
243 | c->lxc_conf = NULL; | |
244 | } | |
2a59a681 SH |
245 | if (c->config_path) { |
246 | free(c->config_path); | |
247 | c->config_path = NULL; | |
248 | } | |
72d0e1cb SG |
249 | free(c); |
250 | } | |
251 | ||
43d1aa34 SH |
252 | /* |
253 | * Consider the following case: | |
254 | freer | racing get()er | |
255 | ================================================================== | |
256 | lxc_container_put() | lxc_container_get() | |
257 | \ lxclock(c->privlock) | c->numthreads < 1? (no) | |
258 | \ c->numthreads = 0 | \ lxclock(c->privlock) -> waits | |
259 | \ lxcunlock() | \ | |
260 | \ lxc_container_free() | \ lxclock() returns | |
261 | | \ c->numthreads < 1 -> return 0 | |
262 | \ \ (free stuff) | | |
263 | \ \ sem_destroy(privlock) | | |
264 | ||
265 | * When the get()er checks numthreads the first time, one of the following | |
266 | * is true: | |
267 | * 1. freer has set numthreads = 0. get() returns 0 | |
268 | * 2. freer is between lxclock and setting numthreads to 0. get()er will | |
269 | * sem_wait on privlock, get lxclock after freer() drops it, then see | |
270 | * numthreads is 0 and exit without touching lxclock again.. | |
271 | * 3. freer has not yet locked privlock. If get()er runs first, then put()er | |
272 | * will see --numthreads = 1 and not call lxc_container_free(). | |
273 | */ | |
274 | ||
72d0e1cb SG |
275 | int lxc_container_get(struct lxc_container *c) |
276 | { | |
277 | if (!c) | |
278 | return 0; | |
279 | ||
43d1aa34 SH |
280 | // if someone else has already started freeing the container, don't |
281 | // try to take the lock, which may be invalid | |
282 | if (c->numthreads < 1) | |
283 | return 0; | |
284 | ||
5cee8c50 | 285 | if (container_mem_lock(c)) |
72d0e1cb SG |
286 | return 0; |
287 | if (c->numthreads < 1) { | |
288 | // bail without trying to unlock, bc the privlock is now probably | |
289 | // in freed memory | |
290 | return 0; | |
291 | } | |
292 | c->numthreads++; | |
5cee8c50 | 293 | container_mem_unlock(c); |
72d0e1cb SG |
294 | return 1; |
295 | } | |
296 | ||
297 | int lxc_container_put(struct lxc_container *c) | |
298 | { | |
299 | if (!c) | |
300 | return -1; | |
5cee8c50 | 301 | if (container_mem_lock(c)) |
72d0e1cb SG |
302 | return -1; |
303 | if (--c->numthreads < 1) { | |
5cee8c50 | 304 | container_mem_unlock(c); |
72d0e1cb SG |
305 | lxc_container_free(c); |
306 | return 1; | |
307 | } | |
5cee8c50 | 308 | container_mem_unlock(c); |
72d0e1cb SG |
309 | return 0; |
310 | } | |
311 | ||
72d0e1cb SG |
312 | static bool lxcapi_is_defined(struct lxc_container *c) |
313 | { | |
314 | struct stat statbuf; | |
315 | bool ret = false; | |
316 | int statret; | |
317 | ||
318 | if (!c) | |
319 | return false; | |
320 | ||
5cee8c50 | 321 | if (container_mem_lock(c)) |
72d0e1cb SG |
322 | return false; |
323 | if (!c->configfile) | |
324 | goto out; | |
325 | statret = stat(c->configfile, &statbuf); | |
326 | if (statret != 0) | |
327 | goto out; | |
328 | ret = true; | |
329 | ||
330 | out: | |
5cee8c50 | 331 | container_mem_unlock(c); |
72d0e1cb SG |
332 | return ret; |
333 | } | |
334 | ||
335 | static const char *lxcapi_state(struct lxc_container *c) | |
336 | { | |
72d0e1cb SG |
337 | lxc_state_t s; |
338 | ||
339 | if (!c) | |
340 | return NULL; | |
13f5be62 | 341 | s = lxc_getstate(c->name, c->config_path); |
39dc698c | 342 | return lxc_state2str(s); |
72d0e1cb SG |
343 | } |
344 | ||
39dc698c | 345 | static bool is_stopped(struct lxc_container *c) |
794dd120 SH |
346 | { |
347 | lxc_state_t s; | |
13f5be62 | 348 | s = lxc_getstate(c->name, c->config_path); |
794dd120 SH |
349 | return (s == STOPPED); |
350 | } | |
351 | ||
72d0e1cb SG |
352 | static bool lxcapi_is_running(struct lxc_container *c) |
353 | { | |
354 | const char *s; | |
355 | ||
356 | if (!c) | |
357 | return false; | |
358 | s = lxcapi_state(c); | |
359 | if (!s || strcmp(s, "STOPPED") == 0) | |
360 | return false; | |
361 | return true; | |
362 | } | |
363 | ||
364 | static bool lxcapi_freeze(struct lxc_container *c) | |
365 | { | |
366 | int ret; | |
367 | if (!c) | |
368 | return false; | |
369 | ||
9123e471 | 370 | ret = lxc_freeze(c->name, c->config_path); |
72d0e1cb SG |
371 | if (ret) |
372 | return false; | |
373 | return true; | |
374 | } | |
375 | ||
376 | static bool lxcapi_unfreeze(struct lxc_container *c) | |
377 | { | |
378 | int ret; | |
379 | if (!c) | |
380 | return false; | |
381 | ||
9123e471 | 382 | ret = lxc_unfreeze(c->name, c->config_path); |
72d0e1cb SG |
383 | if (ret) |
384 | return false; | |
385 | return true; | |
386 | } | |
387 | ||
b5159817 | 388 | static int lxcapi_console_getfd(struct lxc_container *c, int *ttynum, int *masterfd) |
0115f8fd DE |
389 | { |
390 | int ttyfd; | |
391 | if (!c) | |
392 | return -1; | |
393 | ||
b5159817 | 394 | ttyfd = lxc_console_getfd(c, ttynum, masterfd); |
0115f8fd DE |
395 | return ttyfd; |
396 | } | |
397 | ||
b5159817 DE |
398 | static int lxcapi_console(struct lxc_container *c, int ttynum, int stdinfd, |
399 | int stdoutfd, int stderrfd, int escape) | |
400 | { | |
401 | return lxc_console(c, ttynum, stdinfd, stdoutfd, stderrfd, escape); | |
402 | } | |
403 | ||
72d0e1cb SG |
404 | static pid_t lxcapi_init_pid(struct lxc_container *c) |
405 | { | |
72d0e1cb SG |
406 | if (!c) |
407 | return -1; | |
408 | ||
5cee8c50 | 409 | return lxc_cmd_get_init_pid(c->name, c->config_path); |
72d0e1cb SG |
410 | } |
411 | ||
12a50cc6 | 412 | static bool load_config_locked(struct lxc_container *c, const char *fname) |
8eb5694b SH |
413 | { |
414 | if (!c->lxc_conf) | |
415 | c->lxc_conf = lxc_conf_init(); | |
416 | if (c->lxc_conf && !lxc_config_read(fname, c->lxc_conf)) | |
417 | return true; | |
418 | return false; | |
419 | } | |
420 | ||
12a50cc6 | 421 | static bool lxcapi_load_config(struct lxc_container *c, const char *alt_file) |
72d0e1cb | 422 | { |
39dc698c SH |
423 | bool ret = false, need_disklock = false; |
424 | int lret; | |
12a50cc6 | 425 | const char *fname; |
72d0e1cb SG |
426 | if (!c) |
427 | return false; | |
428 | ||
429 | fname = c->configfile; | |
430 | if (alt_file) | |
431 | fname = alt_file; | |
432 | if (!fname) | |
433 | return false; | |
39dc698c SH |
434 | /* |
435 | * If we're reading something other than the container's config, | |
436 | * we only need to lock the in-memory container. If loading the | |
437 | * container's config file, take the disk lock. | |
438 | */ | |
439 | if (strcmp(fname, c->configfile) == 0) | |
440 | need_disklock = true; | |
441 | ||
442 | if (need_disklock) | |
443 | lret = container_disk_lock(c); | |
444 | else | |
445 | lret = container_mem_lock(c); | |
446 | if (lret) | |
72d0e1cb | 447 | return false; |
39dc698c | 448 | |
8eb5694b | 449 | ret = load_config_locked(c, fname); |
39dc698c SH |
450 | |
451 | if (need_disklock) | |
452 | container_disk_unlock(c); | |
453 | else | |
454 | container_mem_unlock(c); | |
72d0e1cb SG |
455 | return ret; |
456 | } | |
457 | ||
540f932a | 458 | static bool lxcapi_want_daemonize(struct lxc_container *c, bool state) |
72d0e1cb | 459 | { |
497a2995 | 460 | if (!c || !c->lxc_conf) |
540f932a | 461 | return false; |
f02abefe | 462 | if (container_mem_lock(c)) { |
3bc449ed | 463 | ERROR("Error getting mem lock"); |
540f932a | 464 | return false; |
3bc449ed | 465 | } |
540f932a | 466 | c->daemonize = state; |
83758ed0 | 467 | /* daemonize implies close_all_fds so set it */ |
540f932a SG |
468 | if (state == 1) |
469 | c->lxc_conf->close_all_fds = 1; | |
3bc449ed | 470 | container_mem_unlock(c); |
540f932a | 471 | return true; |
72d0e1cb SG |
472 | } |
473 | ||
540f932a | 474 | static bool lxcapi_want_close_all_fds(struct lxc_container *c, bool state) |
130a1888 ÇO |
475 | { |
476 | if (!c || !c->lxc_conf) | |
49badbbe | 477 | return false; |
130a1888 ÇO |
478 | if (container_mem_lock(c)) { |
479 | ERROR("Error getting mem lock"); | |
49badbbe | 480 | return false; |
130a1888 | 481 | } |
540f932a | 482 | c->lxc_conf->close_all_fds = state; |
130a1888 | 483 | container_mem_unlock(c); |
49badbbe | 484 | return true; |
130a1888 ÇO |
485 | } |
486 | ||
12a50cc6 | 487 | static bool lxcapi_wait(struct lxc_container *c, const char *state, int timeout) |
7a44c8b4 SG |
488 | { |
489 | int ret; | |
490 | ||
491 | if (!c) | |
492 | return false; | |
493 | ||
67e571de | 494 | ret = lxc_wait(c->name, state, timeout, c->config_path); |
7a44c8b4 SG |
495 | return ret == 0; |
496 | } | |
497 | ||
498 | ||
03f064ff | 499 | static bool wait_on_daemonized_start(struct lxc_container *c, int pid) |
7a44c8b4 SG |
500 | { |
501 | /* we'll probably want to make this timeout configurable? */ | |
697fa639 | 502 | int timeout = 5, ret, status; |
7a44c8b4 | 503 | |
697fa639 SH |
504 | /* |
505 | * our child is going to fork again, then exit. reap the | |
506 | * child | |
507 | */ | |
03f064ff | 508 | ret = waitpid(pid, &status, 0); |
697fa639 SH |
509 | if (ret == -1 || !WIFEXITED(status) || WEXITSTATUS(status) != 0) |
510 | DEBUG("failed waiting for first dual-fork child"); | |
7a44c8b4 SG |
511 | return lxcapi_wait(c, "RUNNING", timeout); |
512 | } | |
513 | ||
2d834aa8 SH |
514 | static bool am_single_threaded(void) |
515 | { | |
516 | struct dirent dirent, *direntp; | |
517 | DIR *dir; | |
518 | int count=0; | |
519 | ||
520 | process_lock(); | |
521 | dir = opendir("/proc/self/task"); | |
522 | process_unlock(); | |
523 | if (!dir) { | |
524 | INFO("failed to open /proc/self/task"); | |
525 | return false; | |
526 | } | |
527 | ||
528 | while (!readdir_r(dir, &dirent, &direntp)) { | |
529 | if (!direntp) | |
530 | break; | |
531 | ||
532 | if (!strcmp(direntp->d_name, ".")) | |
533 | continue; | |
534 | ||
535 | if (!strcmp(direntp->d_name, "..")) | |
536 | continue; | |
537 | if (++count > 1) | |
538 | break; | |
539 | } | |
540 | process_lock(); | |
541 | closedir(dir); | |
542 | process_unlock(); | |
543 | return count == 1; | |
544 | } | |
545 | ||
72d0e1cb SG |
546 | /* |
547 | * I can't decide if it'd be more convenient for callers if we accept '...', | |
548 | * or a null-terminated array (i.e. execl vs execv) | |
549 | */ | |
12a50cc6 | 550 | static bool lxcapi_start(struct lxc_container *c, int useinit, char * const argv[]) |
72d0e1cb SG |
551 | { |
552 | int ret; | |
553 | struct lxc_conf *conf; | |
540f932a | 554 | bool daemonize = false; |
72d0e1cb SG |
555 | char *default_args[] = { |
556 | "/sbin/init", | |
557 | '\0', | |
558 | }; | |
559 | ||
560 | /* container exists */ | |
561 | if (!c) | |
562 | return false; | |
563 | /* container has been setup */ | |
564 | if (!c->lxc_conf) | |
565 | return false; | |
566 | ||
3e625e2d SH |
567 | if ((ret = ongoing_create(c)) < 0) { |
568 | ERROR("Error checking for incomplete creation"); | |
569 | return false; | |
570 | } | |
571 | if (ret == 2) { | |
572 | ERROR("Error: %s creation was not completed", c->name); | |
573 | c->destroy(c); | |
574 | return false; | |
575 | } else if (ret == 1) { | |
576 | ERROR("Error: creation of %s is ongoing", c->name); | |
577 | return false; | |
578 | } | |
579 | ||
72d0e1cb SG |
580 | /* is this app meant to be run through lxcinit, as in lxc-execute? */ |
581 | if (useinit && !argv) | |
582 | return false; | |
583 | ||
5cee8c50 | 584 | if (container_mem_lock(c)) |
72d0e1cb SG |
585 | return false; |
586 | conf = c->lxc_conf; | |
587 | daemonize = c->daemonize; | |
5cee8c50 | 588 | container_mem_unlock(c); |
72d0e1cb SG |
589 | |
590 | if (useinit) { | |
13f5be62 | 591 | ret = lxc_execute(c->name, argv, 1, conf, c->config_path); |
72d0e1cb SG |
592 | return ret == 0 ? true : false; |
593 | } | |
594 | ||
595 | if (!argv) | |
596 | argv = default_args; | |
597 | ||
598 | /* | |
599 | * say, I'm not sure - what locks do we want here? Any? | |
600 | * Is liblxc's locking enough here to protect the on disk | |
601 | * container? We don't want to exclude things like lxc_info | |
602 | * while container is running... | |
603 | */ | |
604 | if (daemonize) { | |
605 | if (!lxc_container_get(c)) | |
606 | return false; | |
e51d4895 | 607 | lxc_monitord_spawn(c->config_path); |
71454076 | 608 | |
72d0e1cb SG |
609 | pid_t pid = fork(); |
610 | if (pid < 0) { | |
611 | lxc_container_put(c); | |
612 | return false; | |
613 | } | |
025ed0f3 | 614 | if (pid != 0) |
03f064ff | 615 | return wait_on_daemonized_start(c, pid); |
025ed0f3 SH |
616 | |
617 | process_unlock(); // we're no longer sharing | |
697fa639 SH |
618 | /* second fork to be reparented by init */ |
619 | pid = fork(); | |
620 | if (pid < 0) { | |
621 | SYSERROR("Error doing dual-fork"); | |
622 | return false; | |
623 | } | |
624 | if (pid != 0) | |
625 | exit(0); | |
72d0e1cb | 626 | /* like daemon(), chdir to / and redirect 0,1,2 to /dev/null */ |
c278cef2 SH |
627 | if (chdir("/")) { |
628 | SYSERROR("Error chdir()ing to /."); | |
629 | return false; | |
630 | } | |
72d0e1cb SG |
631 | close(0); |
632 | close(1); | |
633 | close(2); | |
eddaaafd | 634 | open("/dev/zero", O_RDONLY); |
72d0e1cb SG |
635 | open("/dev/null", O_RDWR); |
636 | open("/dev/null", O_RDWR); | |
637 | setsid(); | |
2d834aa8 SH |
638 | } else { |
639 | if (!am_single_threaded()) { | |
640 | ERROR("Cannot start non-daemonized container when threaded"); | |
641 | return false; | |
642 | } | |
72d0e1cb SG |
643 | } |
644 | ||
72d0e1cb SG |
645 | reboot: |
646 | conf->reboot = 0; | |
13f5be62 | 647 | ret = lxc_start(c->name, argv, conf, c->config_path); |
72d0e1cb SG |
648 | |
649 | if (conf->reboot) { | |
650 | INFO("container requested reboot"); | |
651 | conf->reboot = 0; | |
72d0e1cb SG |
652 | goto reboot; |
653 | } | |
654 | ||
655 | if (daemonize) { | |
656 | lxc_container_put(c); | |
657 | exit (ret == 0 ? true : false); | |
658 | } else { | |
659 | return (ret == 0 ? true : false); | |
660 | } | |
661 | } | |
662 | ||
663 | /* | |
664 | * note there MUST be an ending NULL | |
665 | */ | |
666 | static bool lxcapi_startl(struct lxc_container *c, int useinit, ...) | |
667 | { | |
668 | va_list ap; | |
a0e93eeb | 669 | char **inargs = NULL; |
72d0e1cb SG |
670 | bool bret = false; |
671 | ||
672 | /* container exists */ | |
673 | if (!c) | |
674 | return false; | |
675 | ||
72d0e1cb | 676 | va_start(ap, useinit); |
a0e93eeb | 677 | inargs = lxc_va_arg_list_to_argv(ap, 0, 1); |
72d0e1cb SG |
678 | va_end(ap); |
679 | ||
a0e93eeb CS |
680 | if (!inargs) { |
681 | ERROR("Memory allocation error."); | |
682 | goto out; | |
72d0e1cb SG |
683 | } |
684 | ||
a0e93eeb CS |
685 | /* pass NULL if no arguments were supplied */ |
686 | bret = lxcapi_start(c, useinit, *inargs ? inargs : NULL); | |
72d0e1cb SG |
687 | |
688 | out: | |
689 | if (inargs) { | |
4e03ae57 DE |
690 | char **arg; |
691 | for (arg = inargs; *arg; arg++) | |
692 | free(*arg); | |
72d0e1cb SG |
693 | free(inargs); |
694 | } | |
695 | ||
696 | return bret; | |
697 | } | |
698 | ||
699 | static bool lxcapi_stop(struct lxc_container *c) | |
700 | { | |
701 | int ret; | |
702 | ||
703 | if (!c) | |
704 | return false; | |
705 | ||
ef6e34ee | 706 | ret = lxc_cmd_stop(c->name, c->config_path); |
72d0e1cb SG |
707 | |
708 | return ret == 0; | |
72d0e1cb SG |
709 | } |
710 | ||
72d0e1cb SG |
711 | /* |
712 | * create the standard expected container dir | |
713 | */ | |
714 | static bool create_container_dir(struct lxc_container *c) | |
715 | { | |
716 | char *s; | |
717 | int len, ret; | |
718 | ||
2a59a681 | 719 | len = strlen(c->config_path) + strlen(c->name) + 2; |
72d0e1cb SG |
720 | s = malloc(len); |
721 | if (!s) | |
722 | return false; | |
2a59a681 | 723 | ret = snprintf(s, len, "%s/%s", c->config_path, c->name); |
72d0e1cb SG |
724 | if (ret < 0 || ret >= len) { |
725 | free(s); | |
726 | return false; | |
727 | } | |
728 | ret = mkdir(s, 0755); | |
729 | if (ret) { | |
730 | if (errno == EEXIST) | |
731 | ret = 0; | |
732 | else | |
733 | SYSERROR("failed to create container path for %s\n", c->name); | |
734 | } | |
735 | free(s); | |
736 | return ret == 0; | |
737 | } | |
738 | ||
1897e3bc SH |
739 | static const char *lxcapi_get_config_path(struct lxc_container *c); |
740 | static bool lxcapi_set_config_item(struct lxc_container *c, const char *key, const char *v); | |
741 | ||
72d0e1cb | 742 | /* |
1897e3bc SH |
743 | * do_bdev_create: thin wrapper around bdev_create(). Like bdev_create(), |
744 | * it returns a mounted bdev on success, NULL on error. | |
72d0e1cb | 745 | */ |
1897e3bc SH |
746 | static struct bdev *do_bdev_create(struct lxc_container *c, const char *type, |
747 | struct bdev_specs *specs) | |
748 | { | |
749 | char *dest; | |
1897e3bc SH |
750 | size_t len; |
751 | struct bdev *bdev; | |
752 | int ret; | |
753 | ||
cd219ae6 SY |
754 | /* rootfs.path or lxcpath/lxcname/rootfs */ |
755 | if (c->lxc_conf->rootfs.path && access(c->lxc_conf->rootfs.path, F_OK) == 0) { | |
cf465fe4 SH |
756 | const char *rpath = c->lxc_conf->rootfs.path; |
757 | len = strlen(rpath) + 1; | |
cd219ae6 | 758 | dest = alloca(len); |
cf465fe4 | 759 | ret = snprintf(dest, len, "%s", rpath); |
cd219ae6 | 760 | } else { |
cf465fe4 | 761 | const char *lxcpath = lxcapi_get_config_path(c); |
cd219ae6 SY |
762 | len = strlen(c->name) + strlen(lxcpath) + 9; |
763 | dest = alloca(len); | |
764 | ret = snprintf(dest, len, "%s/%s/rootfs", lxcpath, c->name); | |
765 | } | |
1897e3bc SH |
766 | if (ret < 0 || ret >= len) |
767 | return NULL; | |
768 | ||
769 | bdev = bdev_create(dest, type, c->name, specs); | |
d44e88c2 SH |
770 | if (!bdev) { |
771 | ERROR("Failed to create backing store type %s\n", type); | |
1897e3bc | 772 | return NULL; |
d44e88c2 SH |
773 | } |
774 | ||
1897e3bc | 775 | lxcapi_set_config_item(c, "lxc.rootfs", bdev->src); |
cf3ef16d SH |
776 | |
777 | /* if we are not root, chown the rootfs dir to root in the | |
778 | * target uidmap */ | |
779 | ||
780 | if (geteuid() != 0) { | |
c4d10a05 SH |
781 | if (chown_mapped_root(bdev->dest, c->lxc_conf) < 0) { |
782 | ERROR("Error chowning %s to container root\n", bdev->dest); | |
cf3ef16d SH |
783 | bdev_put(bdev); |
784 | return NULL; | |
785 | } | |
786 | } | |
787 | ||
1897e3bc SH |
788 | return bdev; |
789 | } | |
790 | ||
cbee8106 SH |
791 | /* |
792 | * Given the '-t' template option to lxc-create, figure out what to | |
793 | * do. If the template is a full executable path, use that. If it | |
85db5535 DE |
794 | * is something like 'sshd', then return $templatepath/lxc-sshd. |
795 | * On success return the template, on error return NULL. | |
cbee8106 | 796 | */ |
85db5535 | 797 | static char *get_template_path(const char *t) |
cbee8106 SH |
798 | { |
799 | int ret, len; | |
800 | char *tpath; | |
801 | ||
cbee8106 SH |
802 | if (t[0] == '/' && access(t, X_OK) == 0) { |
803 | tpath = strdup(t); | |
cbee8106 SH |
804 | return tpath; |
805 | } | |
806 | ||
807 | len = strlen(LXCTEMPLATEDIR) + strlen(t) + strlen("/lxc-") + 1; | |
808 | tpath = malloc(len); | |
809 | if (!tpath) | |
85db5535 | 810 | return NULL; |
cbee8106 SH |
811 | ret = snprintf(tpath, len, "%s/lxc-%s", LXCTEMPLATEDIR, t); |
812 | if (ret < 0 || ret >= len) { | |
813 | free(tpath); | |
85db5535 | 814 | return NULL; |
cbee8106 SH |
815 | } |
816 | if (access(tpath, X_OK) < 0) { | |
817 | SYSERROR("bad template: %s\n", t); | |
818 | free(tpath); | |
85db5535 | 819 | return NULL; |
cbee8106 SH |
820 | } |
821 | ||
822 | return tpath; | |
823 | } | |
824 | ||
96b3cb40 | 825 | static char *lxcbasename(char *path) |
72d0e1cb | 826 | { |
96b3cb40 SH |
827 | char *p = path + strlen(path) - 1; |
828 | while (*p != '/' && p > path) | |
829 | p--; | |
830 | return p; | |
831 | } | |
72d0e1cb | 832 | |
dc23c1c8 | 833 | static bool create_run_template(struct lxc_container *c, char *tpath, bool quiet, |
96b3cb40 SH |
834 | char *const argv[]) |
835 | { | |
836 | pid_t pid; | |
72d0e1cb | 837 | |
72d0e1cb | 838 | if (!tpath) |
96b3cb40 | 839 | return true; |
72d0e1cb SG |
840 | |
841 | pid = fork(); | |
842 | if (pid < 0) { | |
843 | SYSERROR("failed to fork task for container creation template\n"); | |
96b3cb40 | 844 | return false; |
72d0e1cb SG |
845 | } |
846 | ||
847 | if (pid == 0) { // child | |
1897e3bc SH |
848 | char *patharg, *namearg, *rootfsarg, *src; |
849 | struct bdev *bdev = NULL; | |
72d0e1cb | 850 | int i; |
96b3cb40 SH |
851 | int ret, len, nargs = 0; |
852 | char **newargv; | |
cf3ef16d | 853 | struct lxc_conf *conf = c->lxc_conf; |
72d0e1cb | 854 | |
025ed0f3 | 855 | process_unlock(); // we're no longer sharing |
dc23c1c8 SH |
856 | if (quiet) { |
857 | close(0); | |
858 | close(1); | |
859 | close(2); | |
860 | open("/dev/zero", O_RDONLY); | |
861 | open("/dev/null", O_RDWR); | |
862 | open("/dev/null", O_RDWR); | |
863 | } | |
1897e3bc SH |
864 | |
865 | src = c->lxc_conf->rootfs.path; | |
866 | /* | |
867 | * for an overlayfs create, what the user wants is the template to fill | |
868 | * in what will become the readonly lower layer. So don't mount for | |
869 | * the template | |
870 | */ | |
871 | if (strncmp(src, "overlayfs:", 10) == 0) { | |
872 | src = overlayfs_getlower(src+10); | |
873 | } | |
874 | bdev = bdev_init(src, c->lxc_conf->rootfs.mount, NULL); | |
875 | if (!bdev) { | |
876 | ERROR("Error opening rootfs"); | |
877 | exit(1); | |
878 | } | |
879 | ||
4de2791f | 880 | if (geteuid() == 0) { |
cf3ef16d SH |
881 | if (unshare(CLONE_NEWNS) < 0) { |
882 | ERROR("error unsharing mounts"); | |
883 | exit(1); | |
884 | } | |
4de2791f SH |
885 | if (detect_shared_rootfs()) { |
886 | if (mount("", "", NULL, MS_SLAVE|MS_REC, 0)) { | |
887 | SYSERROR("Failed to make / rslave to run template"); | |
888 | ERROR("Continuing..."); | |
889 | } | |
890 | } | |
891 | } | |
892 | if (strcmp(bdev->type, "dir") != 0) { | |
893 | if (geteuid() != 0) { | |
894 | ERROR("non-root users can only create directory-backed containers"); | |
895 | exit(1); | |
896 | } | |
cf3ef16d SH |
897 | if (bdev->ops->mount(bdev) < 0) { |
898 | ERROR("Error mounting rootfs"); | |
899 | exit(1); | |
900 | } | |
901 | } else { // TODO come up with a better way here! | |
902 | if (bdev->dest) | |
903 | free(bdev->dest); | |
904 | bdev->dest = strdup(bdev->src); | |
1897e3bc SH |
905 | } |
906 | ||
72d0e1cb SG |
907 | /* |
908 | * create our new array, pre-pend the template name and | |
909 | * base args | |
910 | */ | |
911 | if (argv) | |
1897e3bc SH |
912 | for (nargs = 0; argv[nargs]; nargs++) ; |
913 | nargs += 4; // template, path, rootfs and name args | |
cf3ef16d | 914 | |
72d0e1cb SG |
915 | newargv = malloc(nargs * sizeof(*newargv)); |
916 | if (!newargv) | |
917 | exit(1); | |
96b3cb40 | 918 | newargv[0] = lxcbasename(tpath); |
72d0e1cb | 919 | |
2a59a681 | 920 | len = strlen(c->config_path) + strlen(c->name) + strlen("--path=") + 2; |
72d0e1cb SG |
921 | patharg = malloc(len); |
922 | if (!patharg) | |
923 | exit(1); | |
2a59a681 | 924 | ret = snprintf(patharg, len, "--path=%s/%s", c->config_path, c->name); |
72d0e1cb SG |
925 | if (ret < 0 || ret >= len) |
926 | exit(1); | |
927 | newargv[1] = patharg; | |
928 | len = strlen("--name=") + strlen(c->name) + 1; | |
929 | namearg = malloc(len); | |
930 | if (!namearg) | |
931 | exit(1); | |
932 | ret = snprintf(namearg, len, "--name=%s", c->name); | |
933 | if (ret < 0 || ret >= len) | |
934 | exit(1); | |
935 | newargv[2] = namearg; | |
936 | ||
1897e3bc SH |
937 | len = strlen("--rootfs=") + 1 + strlen(bdev->dest); |
938 | rootfsarg = malloc(len); | |
939 | if (!rootfsarg) | |
940 | exit(1); | |
941 | ret = snprintf(rootfsarg, len, "--rootfs=%s", bdev->dest); | |
942 | if (ret < 0 || ret >= len) | |
943 | exit(1); | |
944 | newargv[3] = rootfsarg; | |
945 | ||
72d0e1cb SG |
946 | /* add passed-in args */ |
947 | if (argv) | |
1897e3bc SH |
948 | for (i = 4; i < nargs; i++) |
949 | newargv[i] = argv[i-4]; | |
72d0e1cb SG |
950 | |
951 | /* add trailing NULL */ | |
952 | nargs++; | |
953 | newargv = realloc(newargv, nargs * sizeof(*newargv)); | |
954 | if (!newargv) | |
955 | exit(1); | |
956 | newargv[nargs - 1] = NULL; | |
957 | ||
cf3ef16d SH |
958 | /* |
959 | * If we're running the template in a mapped userns, then | |
960 | * we prepend the template command with: | |
961 | * lxc-usernsexec <-m map1> ... <-m mapn> -- | |
57d116ab SH |
962 | * and we append "--mapped-uid x", where x is the mapped uid |
963 | * for our geteuid() | |
cf3ef16d SH |
964 | */ |
965 | if (geteuid() != 0 && !lxc_list_empty(&conf->id_map)) { | |
966 | int n2args = 1; | |
57d116ab | 967 | char txtuid[20]; |
cf3ef16d SH |
968 | char **n2 = malloc(n2args * sizeof(*n2)); |
969 | struct lxc_list *it; | |
970 | struct id_map *map; | |
971 | ||
57d116ab SH |
972 | if (!n2) { |
973 | SYSERROR("out of memory"); | |
974 | exit(1); | |
975 | } | |
cf3ef16d SH |
976 | newargv[0] = tpath; |
977 | tpath = "lxc-usernsexec"; | |
978 | n2[0] = "lxc-usernsexec"; | |
979 | lxc_list_for_each(it, &conf->id_map) { | |
980 | map = it->elem; | |
981 | n2args += 2; | |
57d116ab | 982 | n2 = realloc(n2, n2args * sizeof(char *)); |
cf3ef16d SH |
983 | if (!n2) |
984 | exit(1); | |
985 | n2[n2args-2] = "-m"; | |
986 | n2[n2args-1] = malloc(200); | |
987 | if (!n2[n2args-1]) | |
988 | exit(1); | |
989 | ret = snprintf(n2[n2args-1], 200, "%c:%lu:%lu:%lu", | |
990 | map->idtype == ID_TYPE_UID ? 'u' : 'g', | |
991 | map->nsid, map->hostid, map->range); | |
992 | if (ret < 0 || ret >= 200) | |
993 | exit(1); | |
994 | } | |
57d116ab SH |
995 | int hostid_mapped = mapped_hostid(geteuid(), conf); |
996 | int extraargs = hostid_mapped >= 0 ? 1 : 3; | |
997 | n2 = realloc(n2, (nargs + n2args + extraargs) * sizeof(char *)); | |
cf3ef16d SH |
998 | if (!n2) |
999 | exit(1); | |
57d116ab SH |
1000 | if (hostid_mapped < 0) { |
1001 | hostid_mapped = find_unmapped_nsuid(conf); | |
cf3ef16d | 1002 | n2[n2args++] = "-m"; |
57d116ab | 1003 | if (hostid_mapped < 0) { |
cf3ef16d SH |
1004 | ERROR("Could not find free uid to map"); |
1005 | exit(1); | |
1006 | } | |
1007 | n2[n2args++] = malloc(200); | |
1008 | if (!n2[n2args-1]) { | |
1009 | SYSERROR("out of memory"); | |
1010 | exit(1); | |
1011 | } | |
1012 | ret = snprintf(n2[n2args-1], 200, "u:%d:%d:1", | |
57d116ab | 1013 | hostid_mapped, geteuid()); |
cf3ef16d SH |
1014 | if (ret < 0 || ret >= 200) { |
1015 | ERROR("string too long"); | |
1016 | exit(1); | |
1017 | } | |
1018 | } | |
1019 | n2[n2args++] = "--"; | |
1020 | for (i = 0; i < nargs; i++) | |
1021 | n2[i + n2args] = newargv[i]; | |
57d116ab SH |
1022 | n2args += nargs; |
1023 | // Finally add "--mapped-uid $uid" to tell template what to chown | |
1024 | // cached images to | |
1025 | n2args += 2; | |
1026 | n2 = realloc(n2, n2args * sizeof(char *)); | |
1027 | if (!n2) { | |
1028 | SYSERROR("out of memory"); | |
1029 | exit(1); | |
1030 | } | |
1031 | // note n2[n2args-1] is NULL | |
1032 | n2[n2args-3] = "--mapped-uid"; | |
1033 | snprintf(txtuid, 20, "%d", hostid_mapped); | |
1034 | n2[n2args-2] = txtuid; | |
1035 | n2[n2args-1] = NULL; | |
cf3ef16d SH |
1036 | free(newargv); |
1037 | newargv = n2; | |
1038 | } | |
72d0e1cb | 1039 | /* execute */ |
cf3ef16d | 1040 | execvp(tpath, newargv); |
72d0e1cb SG |
1041 | SYSERROR("failed to execute template %s", tpath); |
1042 | exit(1); | |
1043 | } | |
1044 | ||
9be53773 SH |
1045 | if (wait_for_pid(pid) != 0) { |
1046 | ERROR("container creation template for %s failed\n", c->name); | |
96b3cb40 SH |
1047 | return false; |
1048 | } | |
1049 | ||
1050 | return true; | |
1051 | } | |
1052 | ||
3ce74686 SH |
1053 | bool prepend_lxc_header(char *path, const char *t, char *const argv[]) |
1054 | { | |
1fd9bd50 | 1055 | long flen; |
b4569e93 | 1056 | char *contents; |
3ce74686 | 1057 | FILE *f; |
025ed0f3 | 1058 | int ret = -1; |
52026772 | 1059 | #if HAVE_LIBGNUTLS |
025ed0f3 | 1060 | int i; |
3ce74686 | 1061 | unsigned char md_value[SHA_DIGEST_LENGTH]; |
b4569e93 | 1062 | char *tpath; |
52026772 | 1063 | #endif |
3ce74686 | 1064 | |
025ed0f3 SH |
1065 | process_lock(); |
1066 | f = fopen(path, "r"); | |
1067 | process_unlock(); | |
1068 | if (f == NULL) | |
3ce74686 | 1069 | return false; |
025ed0f3 SH |
1070 | |
1071 | if (fseek(f, 0, SEEK_END) < 0) | |
1072 | goto out_error; | |
1073 | if ((flen = ftell(f)) < 0) | |
1074 | goto out_error; | |
1075 | if (fseek(f, 0, SEEK_SET) < 0) | |
1076 | goto out_error; | |
1077 | if ((contents = malloc(flen + 1)) == NULL) | |
1078 | goto out_error; | |
1079 | if (fread(contents, 1, flen, f) != flen) | |
1080 | goto out_free_contents; | |
1081 | ||
3ce74686 | 1082 | contents[flen] = '\0'; |
025ed0f3 SH |
1083 | process_lock(); |
1084 | ret = fclose(f); | |
1085 | process_unlock(); | |
1086 | f = NULL; | |
1087 | if (ret < 0) | |
1088 | goto out_free_contents; | |
3ce74686 | 1089 | |
b4569e93 | 1090 | #if HAVE_LIBGNUTLS |
01efd4d3 | 1091 | tpath = get_template_path(t); |
85db5535 | 1092 | if (!tpath) { |
3ce74686 | 1093 | ERROR("bad template: %s\n", t); |
025ed0f3 | 1094 | goto out_free_contents; |
3ce74686 SH |
1095 | } |
1096 | ||
85db5535 DE |
1097 | ret = sha1sum_file(tpath, md_value); |
1098 | if (ret < 0) { | |
1099 | ERROR("Error getting sha1sum of %s", tpath); | |
3ce74686 | 1100 | free(tpath); |
85db5535 | 1101 | goto out_free_contents; |
3ce74686 | 1102 | } |
85db5535 | 1103 | free(tpath); |
3ce74686 SH |
1104 | #endif |
1105 | ||
025ed0f3 SH |
1106 | process_lock(); |
1107 | f = fopen(path, "w"); | |
1108 | process_unlock(); | |
1109 | if (f == NULL) { | |
3ce74686 SH |
1110 | SYSERROR("reopening config for writing"); |
1111 | free(contents); | |
1112 | return false; | |
1113 | } | |
1114 | fprintf(f, "# Template used to create this container: %s\n", t); | |
1115 | if (argv) { | |
1116 | fprintf(f, "# Parameters passed to the template:"); | |
1117 | while (*argv) { | |
1118 | fprintf(f, " %s", *argv); | |
1119 | argv++; | |
1120 | } | |
1121 | fprintf(f, "\n"); | |
1122 | } | |
1123 | #if HAVE_LIBGNUTLS | |
56698177 SH |
1124 | fprintf(f, "# Template script checksum (SHA-1): "); |
1125 | for (i=0; i<SHA_DIGEST_LENGTH; i++) | |
1126 | fprintf(f, "%02x", md_value[i]); | |
1127 | fprintf(f, "\n"); | |
3ce74686 SH |
1128 | #endif |
1129 | if (fwrite(contents, 1, flen, f) != flen) { | |
1130 | SYSERROR("Writing original contents"); | |
1131 | free(contents); | |
025ed0f3 | 1132 | process_lock(); |
3ce74686 | 1133 | fclose(f); |
025ed0f3 | 1134 | process_unlock(); |
3ce74686 SH |
1135 | return false; |
1136 | } | |
025ed0f3 SH |
1137 | ret = 0; |
1138 | out_free_contents: | |
3ce74686 | 1139 | free(contents); |
025ed0f3 SH |
1140 | out_error: |
1141 | if (f) { | |
1142 | int newret; | |
1143 | process_lock(); | |
1144 | newret = fclose(f); | |
1145 | process_unlock(); | |
1146 | if (ret == 0) | |
1147 | ret = newret; | |
1148 | } | |
1149 | if (ret < 0) { | |
1150 | SYSERROR("Error prepending header"); | |
3ce74686 SH |
1151 | return false; |
1152 | } | |
1153 | return true; | |
1154 | } | |
1155 | ||
4df7f012 SH |
1156 | static void lxcapi_clear_config(struct lxc_container *c) |
1157 | { | |
1158 | if (c && c->lxc_conf) { | |
1159 | lxc_conf_free(c->lxc_conf); | |
1160 | c->lxc_conf = NULL; | |
1161 | } | |
1162 | } | |
1163 | ||
96b3cb40 SH |
1164 | static bool lxcapi_destroy(struct lxc_container *c); |
1165 | /* | |
1166 | * lxcapi_create: | |
1167 | * create a container with the given parameters. | |
1168 | * @c: container to be created. It has the lxcpath, name, and a starting | |
1169 | * configuration already set | |
1170 | * @t: the template to execute to instantiate the root filesystem and | |
1171 | * adjust the configuration. | |
1172 | * @bdevtype: backing store type to use. If NULL, dir will be used. | |
1173 | * @specs: additional parameters for the backing store, i.e. LVM vg to | |
1174 | * use. | |
1175 | * | |
1176 | * @argv: the arguments to pass to the template, terminated by NULL. If no | |
1177 | * arguments, you can just pass NULL. | |
1178 | */ | |
1179 | static bool lxcapi_create(struct lxc_container *c, const char *t, | |
dc23c1c8 | 1180 | const char *bdevtype, struct bdev_specs *specs, int flags, |
96b3cb40 SH |
1181 | char *const argv[]) |
1182 | { | |
a69aad27 | 1183 | bool ret = false; |
96b3cb40 | 1184 | pid_t pid; |
85db5535 | 1185 | char *tpath = NULL; |
cbee8106 | 1186 | int partial_fd; |
96b3cb40 SH |
1187 | |
1188 | if (!c) | |
1189 | return false; | |
1190 | ||
85db5535 DE |
1191 | if (t) { |
1192 | tpath = get_template_path(t); | |
1193 | if (!tpath) { | |
1194 | ERROR("bad template: %s\n", t); | |
1195 | goto out; | |
1196 | } | |
96b3cb40 SH |
1197 | } |
1198 | ||
cf465fe4 SH |
1199 | /* |
1200 | * If a template is passed in, and the rootfs already is defined in | |
1201 | * the container config and exists, then * caller is trying to create | |
1202 | * an existing container. Return an error, but do NOT delete the | |
1203 | * container. | |
1204 | */ | |
1205 | if (lxcapi_is_defined(c) && c->lxc_conf && c->lxc_conf->rootfs.path && | |
1206 | access(c->lxc_conf->rootfs.path, F_OK) == 0 && tpath) { | |
1207 | ERROR("Container %s:%s already exists", c->config_path, c->name); | |
6c6892b5 | 1208 | goto free_tpath; |
cf465fe4 SH |
1209 | } |
1210 | ||
6c6892b5 DE |
1211 | if (!c->lxc_conf) { |
1212 | if (!c->load_config(c, LXC_DEFAULT_CONFIG)) { | |
1213 | ERROR("Error loading default configuration file %s\n", LXC_DEFAULT_CONFIG); | |
1214 | goto free_tpath; | |
1215 | } | |
96b3cb40 SH |
1216 | } |
1217 | ||
6c6892b5 DE |
1218 | if (!create_container_dir(c)) |
1219 | goto free_tpath; | |
1220 | ||
0590e82c SH |
1221 | /* |
1222 | * either template or rootfs.path should be set. | |
1223 | * if both template and rootfs.path are set, template is setup as rootfs.path. | |
1224 | * container is already created if we have a config and rootfs.path is accessible | |
1225 | */ | |
1226 | if (!c->lxc_conf->rootfs.path && !tpath) | |
1227 | /* no template passed in and rootfs does not exist: error */ | |
1228 | goto out; | |
1229 | if (c->lxc_conf->rootfs.path && access(c->lxc_conf->rootfs.path, F_OK) != 0) | |
1230 | /* rootfs passed into configuration, but does not exist: error */ | |
1231 | goto out; | |
1232 | if (lxcapi_is_defined(c) && c->lxc_conf->rootfs.path && !tpath) { | |
1233 | /* Rootfs already existed, user just wanted to save the | |
1234 | * loaded configuration */ | |
1235 | ret = true; | |
1236 | goto out; | |
a69aad27 | 1237 | } |
96b3cb40 SH |
1238 | |
1239 | /* Mark that this container is being created */ | |
1240 | if ((partial_fd = create_partial(c)) < 0) | |
1241 | goto out; | |
1242 | ||
1243 | /* no need to get disk lock bc we have the partial locked */ | |
1244 | ||
1245 | /* | |
1246 | * Create the backing store | |
1247 | * Note we can't do this in the same task as we use to execute the | |
1248 | * template because of the way zfs works. | |
1249 | * After you 'zfs create', zfs mounts the fs only in the initial | |
1250 | * namespace. | |
1251 | */ | |
1252 | pid = fork(); | |
1253 | if (pid < 0) { | |
1254 | SYSERROR("failed to fork task for container creation template\n"); | |
8eb5694b SH |
1255 | goto out_unlock; |
1256 | } | |
1257 | ||
96b3cb40 SH |
1258 | if (pid == 0) { // child |
1259 | struct bdev *bdev = NULL; | |
1260 | ||
025ed0f3 | 1261 | process_unlock(); // we're no longer sharing |
96b3cb40 SH |
1262 | if (!(bdev = do_bdev_create(c, bdevtype, specs))) { |
1263 | ERROR("Error creating backing store type %s for %s", | |
1264 | bdevtype ? bdevtype : "(none)", c->name); | |
1265 | exit(1); | |
1266 | } | |
1267 | ||
1268 | /* save config file again to store the new rootfs location */ | |
1269 | if (!c->save_config(c, NULL)) { | |
1270 | ERROR("failed to save starting configuration for %s\n", c->name); | |
1271 | // parent task won't see bdev in config so we delete it | |
1272 | bdev->ops->umount(bdev); | |
1273 | bdev->ops->destroy(bdev); | |
1274 | exit(1); | |
1275 | } | |
1276 | exit(0); | |
1277 | } | |
1278 | if (wait_for_pid(pid) != 0) | |
a09295f8 | 1279 | goto out_unlock; |
96b3cb40 SH |
1280 | |
1281 | /* reload config to get the rootfs */ | |
1282 | if (c->lxc_conf) | |
1283 | lxc_conf_free(c->lxc_conf); | |
1284 | c->lxc_conf = NULL; | |
1285 | if (!load_config_locked(c, c->configfile)) | |
a09295f8 | 1286 | goto out_unlock; |
96b3cb40 | 1287 | |
dc23c1c8 | 1288 | if (!create_run_template(c, tpath, !!(flags & LXC_CREATE_QUIET), argv)) |
96b3cb40 SH |
1289 | goto out_unlock; |
1290 | ||
8eb5694b SH |
1291 | // now clear out the lxc_conf we have, reload from the created |
1292 | // container | |
4df7f012 | 1293 | lxcapi_clear_config(c); |
3ce74686 | 1294 | |
9d65a487 KY |
1295 | if (t) { |
1296 | if (!prepend_lxc_header(c->configfile, tpath, argv)) { | |
1297 | ERROR("Error prepending header to configuration file"); | |
1298 | goto out_unlock; | |
1299 | } | |
3ce74686 | 1300 | } |
a69aad27 | 1301 | ret = load_config_locked(c, c->configfile); |
72d0e1cb SG |
1302 | |
1303 | out_unlock: | |
3e625e2d SH |
1304 | if (partial_fd >= 0) |
1305 | remove_partial(c, partial_fd); | |
72d0e1cb | 1306 | out: |
a69aad27 | 1307 | if (!ret && c) |
1897e3bc | 1308 | lxcapi_destroy(c); |
6c6892b5 DE |
1309 | free_tpath: |
1310 | if (tpath) | |
1311 | free(tpath); | |
a69aad27 | 1312 | return ret; |
72d0e1cb SG |
1313 | } |
1314 | ||
3e625e2d SH |
1315 | static bool lxcapi_reboot(struct lxc_container *c) |
1316 | { | |
1317 | pid_t pid; | |
1318 | ||
1319 | if (!c) | |
1320 | return false; | |
1321 | if (!c->is_running(c)) | |
1322 | return false; | |
1323 | pid = c->init_pid(c); | |
1324 | if (pid <= 0) | |
1325 | return false; | |
1326 | if (kill(pid, SIGINT) < 0) | |
1327 | return false; | |
1328 | return true; | |
1329 | ||
1330 | } | |
1331 | ||
72d0e1cb SG |
1332 | static bool lxcapi_shutdown(struct lxc_container *c, int timeout) |
1333 | { | |
1334 | bool retv; | |
1335 | pid_t pid; | |
1336 | ||
1337 | if (!c) | |
1338 | return false; | |
1339 | ||
1340 | if (!timeout) | |
1341 | timeout = -1; | |
1342 | if (!c->is_running(c)) | |
1343 | return true; | |
1344 | pid = c->init_pid(c); | |
1345 | if (pid <= 0) | |
1346 | return true; | |
1347 | kill(pid, SIGPWR); | |
1348 | retv = c->wait(c, "STOPPED", timeout); | |
f6144ed4 | 1349 | if (!retv && timeout > 0) { |
72d0e1cb SG |
1350 | c->stop(c); |
1351 | retv = c->wait(c, "STOPPED", 0); // 0 means don't wait | |
1352 | } | |
1353 | return retv; | |
1354 | } | |
1355 | ||
1897e3bc | 1356 | static bool lxcapi_createl(struct lxc_container *c, const char *t, |
dc23c1c8 | 1357 | const char *bdevtype, struct bdev_specs *specs, int flags, ...) |
72d0e1cb SG |
1358 | { |
1359 | bool bret = false; | |
a0e93eeb | 1360 | char **args = NULL; |
72d0e1cb | 1361 | va_list ap; |
72d0e1cb SG |
1362 | |
1363 | if (!c) | |
1364 | return false; | |
1365 | ||
1366 | /* | |
1367 | * since we're going to wait for create to finish, I don't think we | |
1368 | * need to get a copy of the arguments. | |
1369 | */ | |
dc23c1c8 | 1370 | va_start(ap, flags); |
a0e93eeb | 1371 | args = lxc_va_arg_list_to_argv(ap, 0, 0); |
72d0e1cb | 1372 | va_end(ap); |
a0e93eeb CS |
1373 | if (!args) { |
1374 | ERROR("Memory allocation error."); | |
1375 | goto out; | |
1376 | } | |
72d0e1cb | 1377 | |
dc23c1c8 | 1378 | bret = c->create(c, t, bdevtype, specs, flags, args); |
72d0e1cb SG |
1379 | |
1380 | out: | |
a0e93eeb | 1381 | free(args); |
72d0e1cb SG |
1382 | return bret; |
1383 | } | |
1384 | ||
12a50cc6 | 1385 | static bool lxcapi_clear_config_item(struct lxc_container *c, const char *key) |
72d0e1cb SG |
1386 | { |
1387 | int ret; | |
1388 | ||
1389 | if (!c || !c->lxc_conf) | |
1390 | return false; | |
5cee8c50 | 1391 | if (container_mem_lock(c)) |
72d0e1cb | 1392 | return false; |
72d0e1cb | 1393 | ret = lxc_clear_config_item(c->lxc_conf, key); |
5cee8c50 | 1394 | container_mem_unlock(c); |
72d0e1cb SG |
1395 | return ret == 0; |
1396 | } | |
1397 | ||
799f29ab ÇO |
1398 | static inline void exit_from_ns(struct lxc_container *c, int *old_netns, int *new_netns) { |
1399 | /* Switch back to original netns */ | |
1400 | if (*old_netns >= 0 && setns(*old_netns, CLONE_NEWNET)) | |
1401 | SYSERROR("failed to setns"); | |
1402 | process_lock(); | |
1403 | if (*new_netns >= 0) | |
1404 | close(*new_netns); | |
1405 | if (*old_netns >= 0) | |
1406 | close(*old_netns); | |
1407 | process_unlock(); | |
1408 | } | |
1409 | ||
1410 | static inline bool enter_to_ns(struct lxc_container *c, int *old_netns, int *new_netns) { | |
1411 | int ret = 0; | |
9c83a661 | 1412 | char new_netns_path[MAXPATHLEN]; |
9c83a661 SG |
1413 | |
1414 | if (!c->is_running(c)) | |
1415 | goto out; | |
1416 | ||
1417 | /* Save reference to old netns */ | |
025ed0f3 | 1418 | process_lock(); |
799f29ab | 1419 | *old_netns = open("/proc/self/ns/net", O_RDONLY); |
025ed0f3 | 1420 | process_unlock(); |
799f29ab | 1421 | if (*old_netns < 0) { |
9c83a661 SG |
1422 | SYSERROR("failed to open /proc/self/ns/net"); |
1423 | goto out; | |
1424 | } | |
1425 | ||
1426 | /* Switch to new netns */ | |
1427 | ret = snprintf(new_netns_path, MAXPATHLEN, "/proc/%d/ns/net", c->init_pid(c)); | |
1428 | if (ret < 0 || ret >= MAXPATHLEN) | |
1429 | goto out; | |
1430 | ||
025ed0f3 | 1431 | process_lock(); |
799f29ab | 1432 | *new_netns = open(new_netns_path, O_RDONLY); |
025ed0f3 | 1433 | process_unlock(); |
799f29ab | 1434 | if (*new_netns < 0) { |
9c83a661 SG |
1435 | SYSERROR("failed to open %s", new_netns_path); |
1436 | goto out; | |
1437 | } | |
1438 | ||
799f29ab | 1439 | if (setns(*new_netns, CLONE_NEWNET)) { |
9c83a661 SG |
1440 | SYSERROR("failed to setns"); |
1441 | goto out; | |
1442 | } | |
799f29ab ÇO |
1443 | return true; |
1444 | out: | |
1445 | exit_from_ns(c, old_netns, new_netns); | |
1446 | return false; | |
1447 | } | |
1448 | ||
9c88ff1f ÇO |
1449 | // used by qsort and bsearch functions for comparing names |
1450 | static inline int string_cmp(char **first, char **second) | |
1451 | { | |
1452 | return strcmp(*first, *second); | |
1453 | } | |
1454 | ||
1455 | // used by qsort and bsearch functions for comparing container names | |
1456 | static inline int container_cmp(struct lxc_container **first, struct lxc_container **second) | |
1457 | { | |
1458 | return strcmp((*first)->name, (*second)->name); | |
1459 | } | |
1460 | ||
1461 | static bool add_to_array(char ***names, char *cname, int pos) | |
1462 | { | |
1463 | char **newnames = realloc(*names, (pos+1) * sizeof(char *)); | |
1464 | if (!newnames) { | |
1465 | ERROR("Out of memory"); | |
1466 | return false; | |
1467 | } | |
1468 | ||
1469 | *names = newnames; | |
1470 | newnames[pos] = strdup(cname); | |
1471 | if (!newnames[pos]) | |
1472 | return false; | |
1473 | ||
1474 | // sort the arrray as we will use binary search on it | |
1475 | qsort(newnames, pos + 1, sizeof(char *), (int (*)(const void *,const void *))string_cmp); | |
1476 | ||
1477 | return true; | |
1478 | } | |
1479 | ||
2871830a | 1480 | static bool add_to_clist(struct lxc_container ***list, struct lxc_container *c, int pos, bool sort) |
9c88ff1f ÇO |
1481 | { |
1482 | struct lxc_container **newlist = realloc(*list, (pos+1) * sizeof(struct lxc_container *)); | |
1483 | if (!newlist) { | |
1484 | ERROR("Out of memory"); | |
1485 | return false; | |
1486 | } | |
1487 | ||
1488 | *list = newlist; | |
1489 | newlist[pos] = c; | |
1490 | ||
1491 | // sort the arrray as we will use binary search on it | |
2871830a DE |
1492 | if (sort) |
1493 | qsort(newlist, pos + 1, sizeof(struct lxc_container *), (int (*)(const void *,const void *))container_cmp); | |
9c88ff1f ÇO |
1494 | |
1495 | return true; | |
1496 | } | |
1497 | ||
1498 | static char** get_from_array(char ***names, char *cname, int size) | |
1499 | { | |
1500 | return (char **)bsearch(&cname, *names, size, sizeof(char *), (int (*)(const void *, const void *))string_cmp); | |
1501 | } | |
1502 | ||
1503 | ||
1504 | static bool array_contains(char ***names, char *cname, int size) { | |
1505 | if(get_from_array(names, cname, size) != NULL) | |
1506 | return true; | |
1507 | return false; | |
1508 | } | |
1509 | ||
1510 | static bool remove_from_array(char ***names, char *cname, int size) | |
1511 | { | |
1512 | char **result = get_from_array(names, cname, size); | |
1513 | if (result != NULL) { | |
1514 | free(result); | |
1515 | return true; | |
1516 | } | |
1517 | return false; | |
1518 | } | |
1519 | ||
799f29ab ÇO |
1520 | static char** lxcapi_get_interfaces(struct lxc_container *c) |
1521 | { | |
9c88ff1f | 1522 | int i, count = 0; |
799f29ab | 1523 | struct ifaddrs *interfaceArray = NULL, *tempIfAddr = NULL; |
9c88ff1f | 1524 | char **interfaces = NULL; |
799f29ab ÇO |
1525 | int old_netns = -1, new_netns = -1; |
1526 | ||
1527 | if (!enter_to_ns(c, &old_netns, &new_netns)) | |
1528 | goto out; | |
1529 | ||
1530 | /* Grab the list of interfaces */ | |
1531 | if (getifaddrs(&interfaceArray)) { | |
1532 | SYSERROR("failed to get interfaces list"); | |
1533 | goto out; | |
1534 | } | |
1535 | ||
1536 | /* Iterate through the interfaces */ | |
1537 | for (tempIfAddr = interfaceArray; tempIfAddr != NULL; tempIfAddr = tempIfAddr->ifa_next) { | |
9c88ff1f ÇO |
1538 | if (array_contains(&interfaces, tempIfAddr->ifa_name, count)) |
1539 | continue; | |
799f29ab | 1540 | |
9c88ff1f ÇO |
1541 | if(!add_to_array(&interfaces, tempIfAddr->ifa_name, count)) |
1542 | goto err; | |
1543 | count++; | |
1544 | } | |
799f29ab ÇO |
1545 | |
1546 | out: | |
9c88ff1f ÇO |
1547 | if (interfaceArray) |
1548 | freeifaddrs(interfaceArray); | |
1549 | ||
1550 | exit_from_ns(c, &old_netns, &new_netns); | |
799f29ab | 1551 | |
9c88ff1f ÇO |
1552 | /* Append NULL to the array */ |
1553 | if(interfaces) | |
1554 | interfaces = (char **)lxc_append_null_to_array((void **)interfaces, count); | |
799f29ab | 1555 | |
9c88ff1f | 1556 | return interfaces; |
799f29ab | 1557 | |
9c88ff1f ÇO |
1558 | err: |
1559 | for(i=0;i<count;i++) | |
1560 | free(interfaces[i]); | |
1561 | free(interfaces); | |
1562 | interfaces = NULL; | |
1563 | goto out; | |
799f29ab ÇO |
1564 | } |
1565 | ||
1566 | static char** lxcapi_get_ips(struct lxc_container *c, char* interface, char* family, int scope) | |
1567 | { | |
9c88ff1f | 1568 | int i, count = 0; |
799f29ab ÇO |
1569 | struct ifaddrs *interfaceArray = NULL, *tempIfAddr = NULL; |
1570 | char addressOutputBuffer[INET6_ADDRSTRLEN]; | |
1571 | void *tempAddrPtr = NULL; | |
9c88ff1f | 1572 | char **addresses = NULL; |
799f29ab ÇO |
1573 | char *address = NULL; |
1574 | int old_netns = -1, new_netns = -1; | |
1575 | ||
1576 | if (!enter_to_ns(c, &old_netns, &new_netns)) | |
1577 | goto out; | |
9c83a661 SG |
1578 | |
1579 | /* Grab the list of interfaces */ | |
1580 | if (getifaddrs(&interfaceArray)) { | |
1581 | SYSERROR("failed to get interfaces list"); | |
1582 | goto out; | |
1583 | } | |
1584 | ||
1585 | /* Iterate through the interfaces */ | |
1586 | for (tempIfAddr = interfaceArray; tempIfAddr != NULL; tempIfAddr = tempIfAddr->ifa_next) { | |
fe218ca3 SG |
1587 | if (tempIfAddr->ifa_addr == NULL) |
1588 | continue; | |
1589 | ||
9c83a661 SG |
1590 | if(tempIfAddr->ifa_addr->sa_family == AF_INET) { |
1591 | if (family && strcmp(family, "inet")) | |
1592 | continue; | |
1593 | tempAddrPtr = &((struct sockaddr_in *)tempIfAddr->ifa_addr)->sin_addr; | |
1594 | } | |
1595 | else { | |
1596 | if (family && strcmp(family, "inet6")) | |
1597 | continue; | |
1598 | ||
1599 | if (((struct sockaddr_in6 *)tempIfAddr->ifa_addr)->sin6_scope_id != scope) | |
1600 | continue; | |
1601 | ||
1602 | tempAddrPtr = &((struct sockaddr_in6 *)tempIfAddr->ifa_addr)->sin6_addr; | |
1603 | } | |
1604 | ||
1605 | if (interface && strcmp(interface, tempIfAddr->ifa_name)) | |
1606 | continue; | |
1607 | else if (!interface && strcmp("lo", tempIfAddr->ifa_name) == 0) | |
1608 | continue; | |
1609 | ||
1610 | address = (char *)inet_ntop(tempIfAddr->ifa_addr->sa_family, | |
1611 | tempAddrPtr, | |
1612 | addressOutputBuffer, | |
1613 | sizeof(addressOutputBuffer)); | |
1614 | if (!address) | |
1615 | continue; | |
1616 | ||
9c88ff1f ÇO |
1617 | if(!add_to_array(&addresses, address, count)) |
1618 | goto err; | |
1619 | count++; | |
9c83a661 SG |
1620 | } |
1621 | ||
1622 | out: | |
1623 | if(interfaceArray) | |
1624 | freeifaddrs(interfaceArray); | |
1625 | ||
799f29ab | 1626 | exit_from_ns(c, &old_netns, &new_netns); |
9c83a661 SG |
1627 | |
1628 | /* Append NULL to the array */ | |
9c88ff1f ÇO |
1629 | if(addresses) |
1630 | addresses = (char **)lxc_append_null_to_array((void **)addresses, count); | |
9c83a661 SG |
1631 | |
1632 | return addresses; | |
9c88ff1f ÇO |
1633 | |
1634 | err: | |
1635 | for(i=0;i<count;i++) | |
1636 | free(addresses[i]); | |
1637 | free(addresses); | |
1638 | addresses = NULL; | |
1639 | ||
1640 | goto out; | |
9c83a661 SG |
1641 | } |
1642 | ||
12a50cc6 | 1643 | static int lxcapi_get_config_item(struct lxc_container *c, const char *key, char *retv, int inlen) |
72d0e1cb SG |
1644 | { |
1645 | int ret; | |
1646 | ||
1647 | if (!c || !c->lxc_conf) | |
1648 | return -1; | |
5cee8c50 | 1649 | if (container_mem_lock(c)) |
72d0e1cb | 1650 | return -1; |
72d0e1cb | 1651 | ret = lxc_get_config_item(c->lxc_conf, key, retv, inlen); |
5cee8c50 | 1652 | container_mem_unlock(c); |
72d0e1cb SG |
1653 | return ret; |
1654 | } | |
1655 | ||
12a50cc6 | 1656 | static int lxcapi_get_keys(struct lxc_container *c, const char *key, char *retv, int inlen) |
72d0e1cb SG |
1657 | { |
1658 | if (!key) | |
1659 | return lxc_listconfigs(retv, inlen); | |
1660 | /* | |
1661 | * Support 'lxc.network.<idx>', i.e. 'lxc.network.0' | |
1662 | * This is an intelligent result to show which keys are valid given | |
1663 | * the type of nic it is | |
1664 | */ | |
1665 | if (!c || !c->lxc_conf) | |
1666 | return -1; | |
5cee8c50 | 1667 | if (container_mem_lock(c)) |
72d0e1cb SG |
1668 | return -1; |
1669 | int ret = -1; | |
1670 | if (strncmp(key, "lxc.network.", 12) == 0) | |
1671 | ret = lxc_list_nicconfigs(c->lxc_conf, key, retv, inlen); | |
5cee8c50 | 1672 | container_mem_unlock(c); |
72d0e1cb SG |
1673 | return ret; |
1674 | } | |
1675 | ||
12a50cc6 | 1676 | static bool lxcapi_save_config(struct lxc_container *c, const char *alt_file) |
72d0e1cb | 1677 | { |
39dc698c SH |
1678 | FILE *fout; |
1679 | bool ret = false, need_disklock = false; | |
1680 | int lret; | |
1681 | ||
72d0e1cb SG |
1682 | if (!alt_file) |
1683 | alt_file = c->configfile; | |
1684 | if (!alt_file) | |
1685 | return false; // should we write to stdout if no file is specified? | |
39dc698c SH |
1686 | |
1687 | // If we haven't yet loaded a config, load the stock config | |
1688 | if (!c->lxc_conf) { | |
72d0e1cb SG |
1689 | if (!c->load_config(c, LXC_DEFAULT_CONFIG)) { |
1690 | ERROR("Error loading default configuration file %s while saving %s\n", LXC_DEFAULT_CONFIG, c->name); | |
1691 | return false; | |
1692 | } | |
39dc698c | 1693 | } |
72d0e1cb | 1694 | |
5a3d2e1e SG |
1695 | if (!create_container_dir(c)) |
1696 | return false; | |
1697 | ||
39dc698c SH |
1698 | /* |
1699 | * If we're writing to the container's config file, take the | |
1700 | * disk lock. Otherwise just take the memlock to protect the | |
1701 | * struct lxc_container while we're traversing it. | |
1702 | */ | |
1703 | if (strcmp(c->configfile, alt_file) == 0) | |
1704 | need_disklock = true; | |
1705 | ||
1706 | if (need_disklock) | |
1707 | lret = container_disk_lock(c); | |
1708 | else | |
1709 | lret = container_mem_lock(c); | |
1710 | ||
1711 | if (lret) | |
72d0e1cb | 1712 | return false; |
39dc698c | 1713 | |
68c9cf36 | 1714 | process_lock(); |
39dc698c | 1715 | fout = fopen(alt_file, "w"); |
68c9cf36 | 1716 | process_unlock(); |
39dc698c SH |
1717 | if (!fout) |
1718 | goto out; | |
72d0e1cb | 1719 | write_config(fout, c->lxc_conf); |
68c9cf36 | 1720 | process_lock(); |
72d0e1cb | 1721 | fclose(fout); |
68c9cf36 | 1722 | process_unlock(); |
39dc698c SH |
1723 | ret = true; |
1724 | ||
1725 | out: | |
1726 | if (need_disklock) | |
1727 | container_disk_unlock(c); | |
1728 | else | |
1729 | container_mem_unlock(c); | |
1730 | return ret; | |
72d0e1cb SG |
1731 | } |
1732 | ||
dfb31b25 SH |
1733 | static bool mod_rdep(struct lxc_container *c, bool inc) |
1734 | { | |
1735 | char path[MAXPATHLEN]; | |
1736 | int ret, v = 0; | |
1737 | FILE *f; | |
1738 | bool bret = false; | |
1739 | ||
1740 | if (container_disk_lock(c)) | |
1741 | return false; | |
1742 | ret = snprintf(path, MAXPATHLEN, "%s/%s/lxc_snapshots", c->config_path, | |
1743 | c->name); | |
1744 | if (ret < 0 || ret > MAXPATHLEN) | |
1745 | goto out; | |
025ed0f3 | 1746 | process_lock(); |
dfb31b25 | 1747 | f = fopen(path, "r"); |
025ed0f3 | 1748 | process_unlock(); |
dfb31b25 SH |
1749 | if (f) { |
1750 | ret = fscanf(f, "%d", &v); | |
025ed0f3 | 1751 | process_lock(); |
dfb31b25 | 1752 | fclose(f); |
025ed0f3 | 1753 | process_unlock(); |
dfb31b25 SH |
1754 | if (ret != 1) { |
1755 | ERROR("Corrupted file %s", path); | |
1756 | goto out; | |
1757 | } | |
1758 | } | |
1759 | v += inc ? 1 : -1; | |
025ed0f3 | 1760 | process_lock(); |
dfb31b25 | 1761 | f = fopen(path, "w"); |
025ed0f3 | 1762 | process_unlock(); |
dfb31b25 SH |
1763 | if (!f) |
1764 | goto out; | |
1765 | if (fprintf(f, "%d\n", v) < 0) { | |
1766 | ERROR("Error writing new snapshots value"); | |
025ed0f3 | 1767 | process_lock(); |
dfb31b25 | 1768 | fclose(f); |
025ed0f3 | 1769 | process_unlock(); |
dfb31b25 SH |
1770 | goto out; |
1771 | } | |
025ed0f3 SH |
1772 | process_lock(); |
1773 | ret = fclose(f); | |
1774 | process_unlock(); | |
1775 | if (ret != 0) { | |
dfb31b25 SH |
1776 | SYSERROR("Error writing to or closing snapshots file"); |
1777 | goto out; | |
1778 | } | |
1779 | ||
1780 | bret = true; | |
1781 | ||
1782 | out: | |
1783 | container_disk_unlock(c); | |
1784 | return bret; | |
1785 | } | |
1786 | ||
1787 | static void strip_newline(char *p) | |
1788 | { | |
1789 | size_t len = strlen(p); | |
1790 | if (len < 1) | |
1791 | return; | |
1792 | if (p[len-1] == '\n') | |
1793 | p[len-1] = '\0'; | |
1794 | } | |
1795 | ||
1796 | static void mod_all_rdeps(struct lxc_container *c, bool inc) | |
1797 | { | |
1798 | struct lxc_container *p; | |
1799 | char *lxcpath = NULL, *lxcname = NULL, path[MAXPATHLEN]; | |
1800 | size_t pathlen = 0, namelen = 0; | |
1801 | FILE *f; | |
1802 | int ret; | |
1803 | ||
1804 | ret = snprintf(path, MAXPATHLEN, "%s/%s/lxc_rdepends", | |
1805 | c->config_path, c->name); | |
1806 | if (ret < 0 || ret >= MAXPATHLEN) { | |
1807 | ERROR("Path name too long"); | |
1808 | return; | |
1809 | } | |
025ed0f3 SH |
1810 | process_lock(); |
1811 | f = fopen(path, "r"); | |
1812 | process_unlock(); | |
1813 | if (f == NULL) | |
dfb31b25 SH |
1814 | return; |
1815 | while (getline(&lxcpath, &pathlen, f) != -1) { | |
1816 | if (getline(&lxcname, &namelen, f) == -1) { | |
1817 | ERROR("badly formatted file %s\n", path); | |
1818 | goto out; | |
1819 | } | |
1820 | strip_newline(lxcpath); | |
1821 | strip_newline(lxcname); | |
1822 | if ((p = lxc_container_new(lxcname, lxcpath)) == NULL) { | |
1823 | ERROR("Unable to find dependent container %s:%s", | |
1824 | lxcpath, lxcname); | |
1825 | continue; | |
1826 | } | |
1827 | if (!mod_rdep(p, inc)) | |
1828 | ERROR("Failed to increase numsnapshots for %s:%s", | |
1829 | lxcpath, lxcname); | |
1830 | lxc_container_put(p); | |
1831 | } | |
1832 | out: | |
1833 | if (lxcpath) free(lxcpath); | |
1834 | if (lxcname) free(lxcname); | |
025ed0f3 | 1835 | process_lock(); |
dfb31b25 | 1836 | fclose(f); |
025ed0f3 | 1837 | process_unlock(); |
dfb31b25 SH |
1838 | } |
1839 | ||
1840 | static bool has_snapshots(struct lxc_container *c) | |
1841 | { | |
1842 | char path[MAXPATHLEN]; | |
1843 | int ret, v; | |
1844 | FILE *f; | |
1845 | bool bret = false; | |
1846 | ||
1847 | ret = snprintf(path, MAXPATHLEN, "%s/%s/lxc_snapshots", c->config_path, | |
1848 | c->name); | |
1849 | if (ret < 0 || ret > MAXPATHLEN) | |
1850 | goto out; | |
025ed0f3 | 1851 | process_lock(); |
dfb31b25 | 1852 | f = fopen(path, "r"); |
025ed0f3 | 1853 | process_unlock(); |
dfb31b25 SH |
1854 | if (!f) |
1855 | goto out; | |
1856 | ret = fscanf(f, "%d", &v); | |
025ed0f3 | 1857 | process_lock(); |
dfb31b25 | 1858 | fclose(f); |
025ed0f3 | 1859 | process_unlock(); |
dfb31b25 SH |
1860 | if (ret != 1) |
1861 | goto out; | |
1862 | bret = v != 0; | |
1863 | ||
1864 | out: | |
1865 | return bret; | |
1866 | } | |
1867 | ||
4355ab5f SH |
1868 | static int lxc_rmdir_onedev_wrapper(void *data) |
1869 | { | |
1870 | char *arg = (char *) data; | |
1871 | return lxc_rmdir_onedev(arg); | |
1872 | } | |
1873 | ||
60bf62d4 | 1874 | // do we want the api to support --force, or leave that to the caller? |
72d0e1cb SG |
1875 | static bool lxcapi_destroy(struct lxc_container *c) |
1876 | { | |
1897e3bc | 1877 | struct bdev *r = NULL; |
60bf62d4 | 1878 | bool ret = false; |
4355ab5f | 1879 | bool am_unpriv; |
72d0e1cb | 1880 | |
1897e3bc | 1881 | if (!c || !lxcapi_is_defined(c)) |
5a3d2e1e SG |
1882 | return false; |
1883 | ||
3bc449ed | 1884 | if (container_disk_lock(c)) |
72d0e1cb | 1885 | return false; |
72d0e1cb | 1886 | |
39dc698c | 1887 | if (!is_stopped(c)) { |
60bf62d4 SH |
1888 | // we should queue some sort of error - in c->error_string? |
1889 | ERROR("container %s is not stopped", c->name); | |
1890 | goto out; | |
72d0e1cb SG |
1891 | } |
1892 | ||
4355ab5f SH |
1893 | am_unpriv = c->lxc_conf && geteuid() != 0 && !lxc_list_empty(&c->lxc_conf->id_map); |
1894 | ||
dfb31b25 | 1895 | if (c->lxc_conf && has_snapshots(c)) { |
2a2d36a4 | 1896 | ERROR("container %s has dependent snapshots", c->name); |
dfb31b25 SH |
1897 | goto out; |
1898 | } | |
1899 | ||
4355ab5f | 1900 | if (!am_unpriv && c->lxc_conf->rootfs.path && c->lxc_conf->rootfs.mount) { |
1897e3bc | 1901 | r = bdev_init(c->lxc_conf->rootfs.path, c->lxc_conf->rootfs.mount, NULL); |
4355ab5f SH |
1902 | if (r) { |
1903 | if (r->ops->destroy(r) < 0) { | |
1904 | bdev_put(r); | |
1905 | ERROR("Error destroying rootfs for %s", c->name); | |
1906 | goto out; | |
1907 | } | |
59d66af2 | 1908 | bdev_put(r); |
60bf62d4 SH |
1909 | } |
1910 | } | |
1911 | ||
dfb31b25 SH |
1912 | mod_all_rdeps(c, false); |
1913 | ||
60bf62d4 SH |
1914 | const char *p1 = lxcapi_get_config_path(c); |
1915 | char *path = alloca(strlen(p1) + strlen(c->name) + 2); | |
1916 | sprintf(path, "%s/%s", p1, c->name); | |
4355ab5f SH |
1917 | if (am_unpriv) |
1918 | ret = userns_exec_1(c->lxc_conf, lxc_rmdir_onedev_wrapper, path); | |
1919 | else | |
1920 | ret = lxc_rmdir_onedev(path); | |
1921 | if (ret < 0) { | |
60bf62d4 SH |
1922 | ERROR("Error destroying container directory for %s", c->name); |
1923 | goto out; | |
1924 | } | |
1925 | ret = true; | |
1926 | ||
1927 | out: | |
3bc449ed | 1928 | container_disk_unlock(c); |
60bf62d4 | 1929 | return ret; |
72d0e1cb SG |
1930 | } |
1931 | ||
96532523 SH |
1932 | static bool set_config_item_locked(struct lxc_container *c, const char *key, const char *v) |
1933 | { | |
1934 | struct lxc_config_t *config; | |
1935 | ||
1936 | if (!c->lxc_conf) | |
1937 | c->lxc_conf = lxc_conf_init(); | |
1938 | if (!c->lxc_conf) | |
1939 | return false; | |
1940 | config = lxc_getconfig(key); | |
1941 | if (!config) | |
1942 | return false; | |
1943 | return (0 == config->cb(key, v, c->lxc_conf)); | |
1944 | } | |
1945 | ||
12a50cc6 | 1946 | static bool lxcapi_set_config_item(struct lxc_container *c, const char *key, const char *v) |
72d0e1cb | 1947 | { |
72d0e1cb | 1948 | bool b = false; |
72d0e1cb SG |
1949 | |
1950 | if (!c) | |
1951 | return false; | |
1952 | ||
5cee8c50 | 1953 | if (container_mem_lock(c)) |
72d0e1cb SG |
1954 | return false; |
1955 | ||
96532523 | 1956 | b = set_config_item_locked(c, key, v); |
72d0e1cb | 1957 | |
5cee8c50 | 1958 | container_mem_unlock(c); |
72d0e1cb SG |
1959 | return b; |
1960 | } | |
1961 | ||
1962 | static char *lxcapi_config_file_name(struct lxc_container *c) | |
1963 | { | |
1964 | if (!c || !c->configfile) | |
1965 | return NULL; | |
1966 | return strdup(c->configfile); | |
1967 | } | |
1968 | ||
2a59a681 SH |
1969 | static const char *lxcapi_get_config_path(struct lxc_container *c) |
1970 | { | |
1971 | if (!c || !c->config_path) | |
1972 | return NULL; | |
1973 | return (const char *)(c->config_path); | |
1974 | } | |
1975 | ||
afeecbba SH |
1976 | /* |
1977 | * not for export | |
1978 | * Just recalculate the c->configfile based on the | |
1979 | * c->config_path, which must be set. | |
1980 | * The lxc_container must be locked or not yet public. | |
1981 | */ | |
1982 | static bool set_config_filename(struct lxc_container *c) | |
1983 | { | |
1984 | char *newpath; | |
1985 | int len, ret; | |
1986 | ||
1987 | if (!c->config_path) | |
1988 | return false; | |
1989 | ||
1990 | /* $lxc_path + "/" + c->name + "/" + "config" + '\0' */ | |
1991 | len = strlen(c->config_path) + strlen(c->name) + strlen("config") + 3; | |
1992 | newpath = malloc(len); | |
1993 | if (!newpath) | |
1994 | return false; | |
1995 | ||
1996 | ret = snprintf(newpath, len, "%s/%s/config", c->config_path, c->name); | |
1997 | if (ret < 0 || ret >= len) { | |
1998 | fprintf(stderr, "Error printing out config file name\n"); | |
1999 | free(newpath); | |
2000 | return false; | |
2001 | } | |
2002 | ||
2003 | if (c->configfile) | |
2004 | free(c->configfile); | |
2005 | c->configfile = newpath; | |
2006 | ||
2007 | return true; | |
2008 | } | |
2009 | ||
2a59a681 SH |
2010 | static bool lxcapi_set_config_path(struct lxc_container *c, const char *path) |
2011 | { | |
2012 | char *p; | |
2013 | bool b = false; | |
afeecbba | 2014 | char *oldpath = NULL; |
2a59a681 SH |
2015 | |
2016 | if (!c) | |
2017 | return b; | |
2018 | ||
5cee8c50 | 2019 | if (container_mem_lock(c)) |
2a59a681 SH |
2020 | return b; |
2021 | ||
2022 | p = strdup(path); | |
afeecbba SH |
2023 | if (!p) { |
2024 | ERROR("Out of memory setting new lxc path"); | |
2a59a681 | 2025 | goto err; |
afeecbba SH |
2026 | } |
2027 | ||
2a59a681 SH |
2028 | b = true; |
2029 | if (c->config_path) | |
afeecbba | 2030 | oldpath = c->config_path; |
2a59a681 | 2031 | c->config_path = p; |
afeecbba SH |
2032 | |
2033 | /* Since we've changed the config path, we have to change the | |
2034 | * config file name too */ | |
2035 | if (!set_config_filename(c)) { | |
2036 | ERROR("Out of memory setting new config filename"); | |
2037 | b = false; | |
2038 | free(c->config_path); | |
2039 | c->config_path = oldpath; | |
2040 | oldpath = NULL; | |
2041 | } | |
2a59a681 | 2042 | err: |
afeecbba SH |
2043 | if (oldpath) |
2044 | free(oldpath); | |
5cee8c50 | 2045 | container_mem_unlock(c); |
2a59a681 SH |
2046 | return b; |
2047 | } | |
2048 | ||
2049 | ||
794dd120 SH |
2050 | static bool lxcapi_set_cgroup_item(struct lxc_container *c, const char *subsys, const char *value) |
2051 | { | |
2052 | int ret; | |
794dd120 SH |
2053 | |
2054 | if (!c) | |
2055 | return false; | |
2056 | ||
3bc449ed | 2057 | if (is_stopped(c)) |
794dd120 SH |
2058 | return false; |
2059 | ||
3bc449ed SH |
2060 | if (container_disk_lock(c)) |
2061 | return false; | |
794dd120 | 2062 | |
33ad9f1a | 2063 | ret = lxc_cgroup_set(subsys, value, c->name, c->config_path); |
3bc449ed SH |
2064 | |
2065 | container_disk_unlock(c); | |
2066 | return ret == 0; | |
794dd120 SH |
2067 | } |
2068 | ||
2069 | static int lxcapi_get_cgroup_item(struct lxc_container *c, const char *subsys, char *retv, int inlen) | |
2070 | { | |
3bc449ed | 2071 | int ret; |
794dd120 | 2072 | |
6502006a | 2073 | if (!c) |
794dd120 SH |
2074 | return -1; |
2075 | ||
3bc449ed | 2076 | if (is_stopped(c)) |
794dd120 SH |
2077 | return -1; |
2078 | ||
3bc449ed SH |
2079 | if (container_disk_lock(c)) |
2080 | return -1; | |
794dd120 | 2081 | |
33ad9f1a | 2082 | ret = lxc_cgroup_get(subsys, retv, inlen, c->name, c->config_path); |
794dd120 | 2083 | |
3bc449ed | 2084 | container_disk_unlock(c); |
794dd120 SH |
2085 | return ret; |
2086 | } | |
2087 | ||
67e571de | 2088 | const char *lxc_get_default_config_path(void) |
83c98d82 DE |
2089 | { |
2090 | return default_lxc_path(); | |
2091 | } | |
794dd120 | 2092 | |
a8428dfa SH |
2093 | const char *lxc_get_default_lvm_vg(void) |
2094 | { | |
2095 | return default_lvm_vg(); | |
2096 | } | |
2097 | ||
f99c386b SS |
2098 | const char *lxc_get_default_lvm_thin_pool(void) |
2099 | { | |
2100 | return default_lvm_thin_pool(); | |
2101 | } | |
2102 | ||
a8428dfa SH |
2103 | const char *lxc_get_default_zfs_root(void) |
2104 | { | |
2105 | return default_zfs_root(); | |
2106 | } | |
2107 | ||
b6b918a1 SG |
2108 | const char *lxc_get_version(void) |
2109 | { | |
2110 | return lxc_version(); | |
2111 | } | |
2112 | ||
9be53773 SH |
2113 | static int copy_file(char *old, char *new) |
2114 | { | |
2115 | int in, out; | |
2116 | ssize_t len, ret; | |
2117 | char buf[8096]; | |
2118 | struct stat sbuf; | |
2119 | ||
2120 | if (file_exists(new)) { | |
2121 | ERROR("copy destination %s exists", new); | |
2122 | return -1; | |
2123 | } | |
2124 | ret = stat(old, &sbuf); | |
2125 | if (ret < 0) { | |
dfb31b25 | 2126 | INFO("Error stat'ing %s", old); |
9be53773 SH |
2127 | return -1; |
2128 | } | |
2129 | ||
025ed0f3 | 2130 | process_lock(); |
9be53773 | 2131 | in = open(old, O_RDONLY); |
025ed0f3 | 2132 | process_unlock(); |
9be53773 | 2133 | if (in < 0) { |
dfb31b25 | 2134 | SYSERROR("Error opening original file %s", old); |
9be53773 SH |
2135 | return -1; |
2136 | } | |
025ed0f3 | 2137 | process_lock(); |
9be53773 | 2138 | out = open(new, O_CREAT | O_EXCL | O_WRONLY, 0644); |
025ed0f3 | 2139 | process_unlock(); |
9be53773 | 2140 | if (out < 0) { |
dfb31b25 | 2141 | SYSERROR("Error opening new file %s", new); |
025ed0f3 | 2142 | process_lock(); |
9be53773 | 2143 | close(in); |
025ed0f3 | 2144 | process_unlock(); |
9be53773 SH |
2145 | return -1; |
2146 | } | |
2147 | ||
2148 | while (1) { | |
2149 | len = read(in, buf, 8096); | |
2150 | if (len < 0) { | |
dfb31b25 | 2151 | SYSERROR("Error reading old file %s", old); |
9be53773 SH |
2152 | goto err; |
2153 | } | |
2154 | if (len == 0) | |
2155 | break; | |
2156 | ret = write(out, buf, len); | |
2157 | if (ret < len) { // should we retry? | |
dfb31b25 | 2158 | SYSERROR("Error: write to new file %s was interrupted", new); |
9be53773 SH |
2159 | goto err; |
2160 | } | |
2161 | } | |
025ed0f3 | 2162 | process_lock(); |
9be53773 SH |
2163 | close(in); |
2164 | close(out); | |
025ed0f3 | 2165 | process_unlock(); |
9be53773 SH |
2166 | |
2167 | // we set mode, but not owner/group | |
2168 | ret = chmod(new, sbuf.st_mode); | |
2169 | if (ret) { | |
dfb31b25 | 2170 | SYSERROR("Error setting mode on %s", new); |
9be53773 SH |
2171 | return -1; |
2172 | } | |
2173 | ||
2174 | return 0; | |
2175 | ||
2176 | err: | |
025ed0f3 | 2177 | process_lock(); |
9be53773 SH |
2178 | close(in); |
2179 | close(out); | |
025ed0f3 | 2180 | process_unlock(); |
9be53773 SH |
2181 | return -1; |
2182 | } | |
2183 | ||
9be53773 SH |
2184 | static int copyhooks(struct lxc_container *oldc, struct lxc_container *c) |
2185 | { | |
2186 | int i; | |
2187 | int ret; | |
2188 | struct lxc_list *it; | |
2189 | ||
2190 | for (i=0; i<NUM_LXC_HOOKS; i++) { | |
2191 | lxc_list_for_each(it, &c->lxc_conf->hooks[i]) { | |
2192 | char *hookname = it->elem; | |
c32981c3 | 2193 | char *fname = strrchr(hookname, '/'); |
9be53773 SH |
2194 | char tmppath[MAXPATHLEN]; |
2195 | if (!fname) // relative path - we don't support, but maybe we should | |
2196 | return 0; | |
2197 | // copy the script, and change the entry in confile | |
2198 | ret = snprintf(tmppath, MAXPATHLEN, "%s/%s/%s", | |
2199 | c->config_path, c->name, fname+1); | |
2200 | if (ret < 0 || ret >= MAXPATHLEN) | |
2201 | return -1; | |
2202 | ret = copy_file(it->elem, tmppath); | |
2203 | if (ret < 0) | |
2204 | return -1; | |
2205 | free(it->elem); | |
2206 | it->elem = strdup(tmppath); | |
2207 | if (!it->elem) { | |
2208 | ERROR("out of memory copying hook path"); | |
2209 | return -1; | |
2210 | } | |
9be53773 SH |
2211 | } |
2212 | } | |
2213 | ||
2214 | c->save_config(c, NULL); | |
2215 | return 0; | |
2216 | } | |
2217 | ||
2218 | static void new_hwaddr(char *hwaddr) | |
2219 | { | |
025ed0f3 SH |
2220 | FILE *f; |
2221 | process_lock(); | |
2222 | f = fopen("/dev/urandom", "r"); | |
2223 | process_unlock(); | |
9be53773 SH |
2224 | if (f) { |
2225 | unsigned int seed; | |
2226 | int ret = fread(&seed, sizeof(seed), 1, f); | |
2227 | if (ret != 1) | |
2228 | seed = time(NULL); | |
025ed0f3 | 2229 | process_lock(); |
9be53773 | 2230 | fclose(f); |
025ed0f3 | 2231 | process_unlock(); |
9be53773 SH |
2232 | srand(seed); |
2233 | } else | |
2234 | srand(time(NULL)); | |
2235 | snprintf(hwaddr, 18, "00:16:3e:%02x:%02x:%02x", | |
2236 | rand() % 255, rand() % 255, rand() % 255); | |
2237 | } | |
2238 | ||
2239 | static void network_new_hwaddrs(struct lxc_container *c) | |
2240 | { | |
2241 | struct lxc_list *it; | |
2242 | ||
2243 | lxc_list_for_each(it, &c->lxc_conf->network) { | |
2244 | struct lxc_netdev *n = it->elem; | |
2245 | if (n->hwaddr) | |
2246 | new_hwaddr(n->hwaddr); | |
2247 | } | |
2248 | } | |
2249 | ||
2250 | static int copy_fstab(struct lxc_container *oldc, struct lxc_container *c) | |
2251 | { | |
2252 | char newpath[MAXPATHLEN]; | |
2253 | char *oldpath = oldc->lxc_conf->fstab; | |
2254 | int ret; | |
2255 | ||
2256 | if (!oldpath) | |
2257 | return 0; | |
2258 | ||
c32981c3 | 2259 | char *p = strrchr(oldpath, '/'); |
9be53773 SH |
2260 | if (!p) |
2261 | return -1; | |
2262 | ret = snprintf(newpath, MAXPATHLEN, "%s/%s%s", | |
2263 | c->config_path, c->name, p); | |
2264 | if (ret < 0 || ret >= MAXPATHLEN) { | |
2265 | ERROR("error printing new path for %s", oldpath); | |
2266 | return -1; | |
2267 | } | |
2268 | if (file_exists(newpath)) { | |
2269 | ERROR("error: fstab file %s exists", newpath); | |
2270 | return -1; | |
2271 | } | |
2272 | ||
2273 | if (copy_file(oldpath, newpath) < 0) { | |
2274 | ERROR("error: copying %s to %s", oldpath, newpath); | |
2275 | return -1; | |
2276 | } | |
2277 | free(c->lxc_conf->fstab); | |
2278 | c->lxc_conf->fstab = strdup(newpath); | |
2279 | if (!c->lxc_conf->fstab) { | |
2280 | ERROR("error: allocating pathname"); | |
2281 | return -1; | |
2282 | } | |
2283 | ||
2284 | return 0; | |
2285 | } | |
2286 | ||
dfb31b25 SH |
2287 | static void copy_rdepends(struct lxc_container *c, struct lxc_container *c0) |
2288 | { | |
2289 | char path0[MAXPATHLEN], path1[MAXPATHLEN]; | |
2290 | int ret; | |
2291 | ||
2292 | ret = snprintf(path0, MAXPATHLEN, "%s/%s/lxc_rdepends", c0->config_path, | |
2293 | c0->name); | |
2294 | if (ret < 0 || ret >= MAXPATHLEN) { | |
2295 | WARN("Error copying reverse dependencies"); | |
2296 | return; | |
2297 | } | |
2298 | ret = snprintf(path1, MAXPATHLEN, "%s/%s/lxc_rdepends", c->config_path, | |
2299 | c->name); | |
2300 | if (ret < 0 || ret >= MAXPATHLEN) { | |
2301 | WARN("Error copying reverse dependencies"); | |
2302 | return; | |
2303 | } | |
2304 | if (copy_file(path0, path1) < 0) { | |
2305 | INFO("Error copying reverse dependencies"); | |
2306 | return; | |
2307 | } | |
2308 | } | |
2309 | ||
2310 | static bool add_rdepends(struct lxc_container *c, struct lxc_container *c0) | |
2311 | { | |
2312 | int ret; | |
2313 | char path[MAXPATHLEN]; | |
2314 | FILE *f; | |
2315 | bool bret; | |
2316 | ||
2317 | ret = snprintf(path, MAXPATHLEN, "%s/%s/lxc_rdepends", c->config_path, | |
2318 | c->name); | |
2319 | if (ret < 0 || ret >= MAXPATHLEN) | |
2320 | return false; | |
025ed0f3 | 2321 | process_lock(); |
dfb31b25 | 2322 | f = fopen(path, "a"); |
025ed0f3 | 2323 | process_unlock(); |
dfb31b25 SH |
2324 | if (!f) |
2325 | return false; | |
2326 | bret = true; | |
2327 | // if anything goes wrong, just return an error | |
2328 | if (fprintf(f, "%s\n%s\n", c0->config_path, c0->name) < 0) | |
2329 | bret = false; | |
025ed0f3 | 2330 | process_lock(); |
dfb31b25 SH |
2331 | if (fclose(f) != 0) |
2332 | bret = false; | |
025ed0f3 | 2333 | process_unlock(); |
dfb31b25 SH |
2334 | return bret; |
2335 | } | |
2336 | ||
9be53773 SH |
2337 | static int copy_storage(struct lxc_container *c0, struct lxc_container *c, |
2338 | const char *newtype, int flags, const char *bdevdata, unsigned long newsize) | |
2339 | { | |
2340 | struct bdev *bdev; | |
dfb31b25 | 2341 | int need_rdep; |
9be53773 SH |
2342 | |
2343 | bdev = bdev_copy(c0->lxc_conf->rootfs.path, c0->name, c->name, | |
2344 | c0->config_path, c->config_path, newtype, !!(flags & LXC_CLONE_SNAPSHOT), | |
dfb31b25 | 2345 | bdevdata, newsize, &need_rdep); |
9be53773 | 2346 | if (!bdev) { |
dfb31b25 | 2347 | ERROR("Error copying storage"); |
9be53773 SH |
2348 | return -1; |
2349 | } | |
2350 | free(c->lxc_conf->rootfs.path); | |
2351 | c->lxc_conf->rootfs.path = strdup(bdev->src); | |
2352 | bdev_put(bdev); | |
dfb31b25 SH |
2353 | if (!c->lxc_conf->rootfs.path) { |
2354 | ERROR("Out of memory while setting storage path"); | |
9be53773 | 2355 | return -1; |
dfb31b25 | 2356 | } |
eee59f94 SH |
2357 | if (flags & LXC_CLONE_SNAPSHOT) |
2358 | copy_rdepends(c, c0); | |
dfb31b25 SH |
2359 | if (need_rdep) { |
2360 | if (!add_rdepends(c, c0)) | |
2361 | WARN("Error adding reverse dependency from %s to %s", | |
2362 | c->name, c0->name); | |
2363 | } | |
2364 | ||
2365 | mod_all_rdeps(c, true); | |
2366 | ||
9be53773 SH |
2367 | return 0; |
2368 | } | |
2369 | ||
1143ed39 DE |
2370 | static int clone_update_rootfs(struct lxc_container *c0, |
2371 | struct lxc_container *c, int flags, | |
2372 | char **hookargs) | |
9be53773 SH |
2373 | { |
2374 | int ret = -1; | |
2375 | char path[MAXPATHLEN]; | |
2376 | struct bdev *bdev; | |
2377 | FILE *fout; | |
2378 | pid_t pid; | |
148e91f5 | 2379 | struct lxc_conf *conf = c->lxc_conf; |
9be53773 SH |
2380 | |
2381 | /* update hostname in rootfs */ | |
2382 | /* we're going to mount, so run in a clean namespace to simplify cleanup */ | |
2383 | ||
2384 | pid = fork(); | |
2385 | if (pid < 0) | |
2386 | return -1; | |
2387 | if (pid > 0) | |
2388 | return wait_for_pid(pid); | |
2389 | ||
025ed0f3 | 2390 | process_unlock(); // we're no longer sharing |
9be53773 SH |
2391 | bdev = bdev_init(c->lxc_conf->rootfs.path, c->lxc_conf->rootfs.mount, NULL); |
2392 | if (!bdev) | |
2393 | exit(1); | |
cf3ef16d SH |
2394 | if (strcmp(bdev->type, "dir") != 0) { |
2395 | if (unshare(CLONE_NEWNS) < 0) { | |
2396 | ERROR("error unsharing mounts"); | |
2397 | exit(1); | |
2398 | } | |
2399 | if (bdev->ops->mount(bdev) < 0) | |
2400 | exit(1); | |
2401 | } else { // TODO come up with a better way | |
2402 | if (bdev->dest) | |
2403 | free(bdev->dest); | |
2404 | bdev->dest = strdup(bdev->src); | |
2405 | } | |
148e91f5 SH |
2406 | |
2407 | if (!lxc_list_empty(&conf->hooks[LXCHOOK_CLONE])) { | |
2408 | /* Start of environment variable setup for hooks */ | |
1143ed39 DE |
2409 | if (setenv("LXC_SRC_NAME", c0->name, 1)) { |
2410 | SYSERROR("failed to set environment variable for source container name"); | |
2411 | } | |
148e91f5 SH |
2412 | if (setenv("LXC_NAME", c->name, 1)) { |
2413 | SYSERROR("failed to set environment variable for container name"); | |
2414 | } | |
2415 | if (setenv("LXC_CONFIG_FILE", conf->rcfile, 1)) { | |
2416 | SYSERROR("failed to set environment variable for config path"); | |
2417 | } | |
24ef39f4 | 2418 | if (setenv("LXC_ROOTFS_MOUNT", bdev->dest, 1)) { |
148e91f5 SH |
2419 | SYSERROR("failed to set environment variable for rootfs mount"); |
2420 | } | |
2421 | if (setenv("LXC_ROOTFS_PATH", conf->rootfs.path, 1)) { | |
2422 | SYSERROR("failed to set environment variable for rootfs mount"); | |
2423 | } | |
2424 | ||
283678ed | 2425 | if (run_lxc_hooks(c->name, "clone", conf, c->get_config_path(c), hookargs)) { |
148e91f5 SH |
2426 | ERROR("Error executing clone hook for %s", c->name); |
2427 | exit(1); | |
2428 | } | |
2429 | } | |
2430 | ||
2431 | if (!(flags & LXC_CLONE_KEEPNAME)) { | |
2432 | ret = snprintf(path, MAXPATHLEN, "%s/etc/hostname", bdev->dest); | |
2433 | if (ret < 0 || ret >= MAXPATHLEN) | |
2434 | exit(1); | |
8058be39 DE |
2435 | if (!file_exists(path)) |
2436 | exit(0); | |
148e91f5 SH |
2437 | if (!(fout = fopen(path, "w"))) { |
2438 | SYSERROR("unable to open %s: ignoring\n", path); | |
2439 | exit(0); | |
2440 | } | |
2441 | if (fprintf(fout, "%s", c->name) < 0) | |
2442 | exit(1); | |
2443 | if (fclose(fout) < 0) | |
2444 | exit(1); | |
9be53773 | 2445 | } |
9be53773 SH |
2446 | exit(0); |
2447 | } | |
2448 | ||
2449 | /* | |
2450 | * We want to support: | |
2451 | sudo lxc-clone -o o1 -n n1 -s -L|-fssize fssize -v|--vgname vgname \ | |
2452 | -p|--lvprefix lvprefix -t|--fstype fstype -B backingstore | |
2453 | ||
2454 | -s [ implies overlayfs] | |
2455 | -s -B overlayfs | |
2456 | -s -B aufs | |
2457 | ||
2458 | only rootfs gets converted (copied/snapshotted) on clone. | |
2459 | */ | |
2460 | ||
2461 | static int create_file_dirname(char *path) | |
2462 | { | |
c32981c3 | 2463 | char *p = strrchr(path, '/'); |
9be53773 SH |
2464 | int ret; |
2465 | ||
2466 | if (!p) | |
2467 | return -1; | |
2468 | *p = '\0'; | |
2469 | ret = mkdir(path, 0755); | |
2470 | if (ret && errno != EEXIST) | |
2471 | SYSERROR("creating container path %s\n", path); | |
2472 | *p = '/'; | |
2473 | return ret; | |
2474 | } | |
2475 | ||
2476 | struct lxc_container *lxcapi_clone(struct lxc_container *c, const char *newname, | |
2477 | const char *lxcpath, int flags, | |
148e91f5 SH |
2478 | const char *bdevtype, const char *bdevdata, unsigned long newsize, |
2479 | char **hookargs) | |
9be53773 SH |
2480 | { |
2481 | struct lxc_container *c2 = NULL; | |
2482 | char newpath[MAXPATHLEN]; | |
176d9acb | 2483 | int ret, storage_copied = 0; |
9be53773 SH |
2484 | const char *n, *l; |
2485 | FILE *fout; | |
2486 | ||
2487 | if (!c || !c->is_defined(c)) | |
2488 | return NULL; | |
2489 | ||
5cee8c50 | 2490 | if (container_mem_lock(c)) |
9be53773 SH |
2491 | return NULL; |
2492 | ||
39dc698c | 2493 | if (!is_stopped(c)) { |
9be53773 SH |
2494 | ERROR("error: Original container (%s) is running", c->name); |
2495 | goto out; | |
2496 | } | |
2497 | ||
2498 | // Make sure the container doesn't yet exist. | |
2499 | n = newname ? newname : c->name; | |
2500 | l = lxcpath ? lxcpath : c->get_config_path(c); | |
2501 | ret = snprintf(newpath, MAXPATHLEN, "%s/%s/config", l, n); | |
2502 | if (ret < 0 || ret >= MAXPATHLEN) { | |
2503 | SYSERROR("clone: failed making config pathname"); | |
2504 | goto out; | |
2505 | } | |
2506 | if (file_exists(newpath)) { | |
2507 | ERROR("error: clone: %s exists", newpath); | |
2508 | goto out; | |
2509 | } | |
2510 | ||
96532523 SH |
2511 | ret = create_file_dirname(newpath); |
2512 | if (ret < 0 && errno != EEXIST) { | |
9be53773 SH |
2513 | ERROR("Error creating container dir for %s", newpath); |
2514 | goto out; | |
2515 | } | |
2516 | ||
2517 | // copy the configuration, tweak it as needed, | |
025ed0f3 | 2518 | process_lock(); |
9be53773 | 2519 | fout = fopen(newpath, "w"); |
025ed0f3 | 2520 | process_unlock(); |
9be53773 SH |
2521 | if (!fout) { |
2522 | SYSERROR("open %s", newpath); | |
2523 | goto out; | |
2524 | } | |
2525 | write_config(fout, c->lxc_conf); | |
025ed0f3 | 2526 | process_lock(); |
9be53773 | 2527 | fclose(fout); |
025ed0f3 | 2528 | process_unlock(); |
9be53773 | 2529 | |
9be53773 SH |
2530 | sprintf(newpath, "%s/%s/rootfs", l, n); |
2531 | if (mkdir(newpath, 0755) < 0) { | |
2532 | SYSERROR("error creating %s", newpath); | |
2533 | goto out; | |
2534 | } | |
2535 | ||
2536 | c2 = lxc_container_new(n, l); | |
375c2258 | 2537 | if (!c2) { |
9be53773 SH |
2538 | ERROR("clone: failed to create new container (%s %s)", n, l); |
2539 | goto out; | |
2540 | } | |
2541 | ||
96532523 SH |
2542 | // update utsname |
2543 | if (!set_config_item_locked(c2, "lxc.utsname", newname)) { | |
2544 | ERROR("Error setting new hostname"); | |
2545 | goto out; | |
2546 | } | |
2547 | ||
2548 | ||
9be53773 SH |
2549 | // copy hooks if requested |
2550 | if (flags & LXC_CLONE_COPYHOOKS) { | |
2551 | ret = copyhooks(c, c2); | |
2552 | if (ret < 0) { | |
2553 | ERROR("error copying hooks"); | |
9be53773 SH |
2554 | goto out; |
2555 | } | |
2556 | } | |
2557 | ||
2558 | if (copy_fstab(c, c2) < 0) { | |
2559 | ERROR("error copying fstab"); | |
9be53773 SH |
2560 | goto out; |
2561 | } | |
2562 | ||
2563 | // update macaddrs | |
2564 | if (!(flags & LXC_CLONE_KEEPMACADDR)) | |
2565 | network_new_hwaddrs(c2); | |
2566 | ||
2567 | // copy/snapshot rootfs's | |
2568 | ret = copy_storage(c, c2, bdevtype, flags, bdevdata, newsize); | |
375c2258 | 2569 | if (ret < 0) |
9be53773 | 2570 | goto out; |
9be53773 | 2571 | |
176d9acb SH |
2572 | // We've now successfully created c2's storage, so clear it out if we |
2573 | // fail after this | |
2574 | storage_copied = 1; | |
2575 | ||
375c2258 | 2576 | if (!c2->save_config(c2, NULL)) |
9be53773 | 2577 | goto out; |
9be53773 | 2578 | |
1143ed39 | 2579 | if (clone_update_rootfs(c, c2, flags, hookargs) < 0) |
9be53773 | 2580 | goto out; |
9be53773 SH |
2581 | |
2582 | // TODO: update c's lxc.snapshot = count | |
5cee8c50 | 2583 | container_mem_unlock(c); |
9be53773 SH |
2584 | return c2; |
2585 | ||
2586 | out: | |
5cee8c50 | 2587 | container_mem_unlock(c); |
375c2258 | 2588 | if (c2) { |
176d9acb SH |
2589 | if (!storage_copied) |
2590 | c2->lxc_conf->rootfs.path = NULL; | |
375c2258 | 2591 | c2->destroy(c2); |
9be53773 | 2592 | lxc_container_put(c2); |
375c2258 | 2593 | } |
9be53773 SH |
2594 | |
2595 | return NULL; | |
2596 | } | |
2597 | ||
a0e93eeb CS |
2598 | 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) |
2599 | { | |
2600 | if (!c) | |
2601 | return -1; | |
2602 | ||
2603 | return lxc_attach(c->name, c->config_path, exec_function, exec_payload, options, attached_process); | |
2604 | } | |
2605 | ||
2606 | static int lxcapi_attach_run_wait(struct lxc_container *c, lxc_attach_options_t *options, const char *program, const char * const argv[]) | |
2607 | { | |
2608 | lxc_attach_command_t command; | |
2609 | pid_t pid; | |
2610 | int r; | |
2611 | ||
2612 | if (!c) | |
2613 | return -1; | |
2614 | ||
2615 | command.program = (char*)program; | |
2616 | command.argv = (char**)argv; | |
2617 | r = lxc_attach(c->name, c->config_path, lxc_attach_run_command, &command, options, &pid); | |
2618 | if (r < 0) { | |
2619 | ERROR("ups"); | |
2620 | return r; | |
2621 | } | |
2622 | return lxc_wait_for_pid_status(pid); | |
2623 | } | |
2624 | ||
f5dd1d53 SH |
2625 | int get_next_index(const char *lxcpath, char *cname) |
2626 | { | |
2627 | char *fname; | |
2628 | struct stat sb; | |
2629 | int i = 0, ret; | |
2630 | ||
2631 | fname = alloca(strlen(lxcpath) + 20); | |
2632 | while (1) { | |
2633 | sprintf(fname, "%s/snap%d", lxcpath, i); | |
2634 | ret = stat(fname, &sb); | |
2635 | if (ret != 0) | |
2636 | return i; | |
2637 | i++; | |
2638 | } | |
2639 | } | |
2640 | ||
2641 | static int lxcapi_snapshot(struct lxc_container *c, char *commentfile) | |
2642 | { | |
2643 | int i, flags, ret; | |
2644 | struct lxc_container *c2; | |
2645 | char snappath[MAXPATHLEN], newname[20]; | |
2646 | ||
2647 | // /var/lib/lxc -> /var/lib/lxcsnaps \0 | |
2648 | ret = snprintf(snappath, MAXPATHLEN, "%ssnaps/%s", c->config_path, c->name); | |
2649 | if (ret < 0 || ret >= MAXPATHLEN) | |
2650 | return -1; | |
2651 | i = get_next_index(snappath, c->name); | |
2652 | ||
2653 | if (mkdir_p(snappath, 0755) < 0) { | |
2654 | ERROR("Failed to create snapshot directory %s", snappath); | |
2655 | return -1; | |
2656 | } | |
2657 | ||
2658 | ret = snprintf(newname, 20, "snap%d", i); | |
2659 | if (ret < 0 || ret >= 20) | |
2660 | return -1; | |
2661 | ||
2662 | flags = LXC_CLONE_SNAPSHOT | LXC_CLONE_KEEPMACADDR | LXC_CLONE_KEEPNAME; | |
2663 | c2 = c->clone(c, newname, snappath, flags, NULL, NULL, 0, NULL); | |
2664 | if (!c2) { | |
2665 | ERROR("clone of %s:%s failed\n", c->config_path, c->name); | |
2666 | return -1; | |
2667 | } | |
2668 | ||
2669 | lxc_container_put(c2); | |
2670 | ||
2671 | // Now write down the creation time | |
2672 | time_t timer; | |
2673 | char buffer[25]; | |
2674 | struct tm* tm_info; | |
025ed0f3 | 2675 | FILE *f; |
f5dd1d53 SH |
2676 | |
2677 | time(&timer); | |
2678 | tm_info = localtime(&timer); | |
2679 | ||
2680 | strftime(buffer, 25, "%Y:%m:%d %H:%M:%S", tm_info); | |
2681 | ||
2682 | char *dfnam = alloca(strlen(snappath) + strlen(newname) + 5); | |
2683 | sprintf(dfnam, "%s/%s/ts", snappath, newname); | |
025ed0f3 SH |
2684 | process_lock(); |
2685 | f = fopen(dfnam, "w"); | |
2686 | process_unlock(); | |
f5dd1d53 SH |
2687 | if (!f) { |
2688 | ERROR("Failed to open %s\n", dfnam); | |
2689 | return -1; | |
2690 | } | |
2691 | if (fprintf(f, "%s", buffer) < 0) { | |
2692 | SYSERROR("Writing timestamp"); | |
2693 | fclose(f); | |
2694 | return -1; | |
2695 | } | |
025ed0f3 SH |
2696 | process_lock(); |
2697 | ret = fclose(f); | |
2698 | process_unlock(); | |
2699 | if (ret != 0) { | |
f5dd1d53 SH |
2700 | SYSERROR("Writing timestamp"); |
2701 | return -1; | |
2702 | } | |
2703 | ||
2704 | if (commentfile) { | |
2705 | // $p / $name / comment \0 | |
2706 | int len = strlen(snappath) + strlen(newname) + 10; | |
2707 | char *path = alloca(len); | |
2708 | sprintf(path, "%s/%s/comment", snappath, newname); | |
2709 | return copy_file(commentfile, path) < 0 ? -1 : i; | |
2710 | } | |
2711 | ||
2712 | return i; | |
2713 | } | |
2714 | ||
2715 | static void lxcsnap_free(struct lxc_snapshot *s) | |
2716 | { | |
2717 | if (s->name) | |
2718 | free(s->name); | |
2719 | if (s->comment_pathname) | |
2720 | free(s->comment_pathname); | |
2721 | if (s->timestamp) | |
2722 | free(s->timestamp); | |
2723 | if (s->lxcpath) | |
2724 | free(s->lxcpath); | |
2725 | } | |
2726 | ||
2727 | static char *get_snapcomment_path(char* snappath, char *name) | |
2728 | { | |
2729 | // $snappath/$name/comment | |
2730 | int ret, len = strlen(snappath) + strlen(name) + 10; | |
2731 | char *s = malloc(len); | |
2732 | ||
2733 | if (s) { | |
2734 | ret = snprintf(s, len, "%s/%s/comment", snappath, name); | |
2735 | if (ret < 0 || ret >= len) { | |
2736 | free(s); | |
2737 | s = NULL; | |
2738 | } | |
2739 | } | |
2740 | return s; | |
2741 | } | |
2742 | ||
2743 | static char *get_timestamp(char* snappath, char *name) | |
2744 | { | |
2745 | char path[MAXPATHLEN], *s = NULL; | |
2746 | int ret, len; | |
2747 | FILE *fin; | |
2748 | ||
2749 | ret = snprintf(path, MAXPATHLEN, "%s/%s/ts", snappath, name); | |
2750 | if (ret < 0 || ret >= MAXPATHLEN) | |
2751 | return NULL; | |
025ed0f3 SH |
2752 | process_lock(); |
2753 | fin = fopen(path, "r"); | |
2754 | process_unlock(); | |
2755 | if (!fin) | |
f5dd1d53 SH |
2756 | return NULL; |
2757 | (void) fseek(fin, 0, SEEK_END); | |
2758 | len = ftell(fin); | |
2759 | (void) fseek(fin, 0, SEEK_SET); | |
2760 | if (len > 0) { | |
2761 | s = malloc(len+1); | |
2762 | if (s) { | |
2763 | s[len] = '\0'; | |
2764 | if (fread(s, 1, len, fin) != len) { | |
2765 | SYSERROR("reading timestamp"); | |
2766 | free(s); | |
2767 | s = NULL; | |
2768 | } | |
2769 | } | |
2770 | } | |
025ed0f3 | 2771 | process_lock(); |
f5dd1d53 | 2772 | fclose(fin); |
025ed0f3 | 2773 | process_unlock(); |
f5dd1d53 SH |
2774 | return s; |
2775 | } | |
2776 | ||
2777 | static int lxcapi_snapshot_list(struct lxc_container *c, struct lxc_snapshot **ret_snaps) | |
2778 | { | |
2779 | char snappath[MAXPATHLEN], path2[MAXPATHLEN]; | |
2780 | int dirlen, count = 0, ret; | |
2781 | struct dirent dirent, *direntp; | |
2782 | struct lxc_snapshot *snaps =NULL, *nsnaps; | |
2783 | DIR *dir; | |
2784 | ||
2785 | if (!c || !lxcapi_is_defined(c)) | |
2786 | return -1; | |
2787 | // snappath is ${lxcpath}snaps/${lxcname}/ | |
2788 | dirlen = snprintf(snappath, MAXPATHLEN, "%ssnaps/%s", c->config_path, c->name); | |
2789 | if (dirlen < 0 || dirlen >= MAXPATHLEN) { | |
2790 | ERROR("path name too long"); | |
2791 | return -1; | |
2792 | } | |
025ed0f3 SH |
2793 | process_lock(); |
2794 | dir = opendir(snappath); | |
2795 | process_unlock(); | |
2796 | if (!dir) { | |
f5dd1d53 SH |
2797 | INFO("failed to open %s - assuming no snapshots", snappath); |
2798 | return 0; | |
2799 | } | |
2800 | ||
2801 | while (!readdir_r(dir, &dirent, &direntp)) { | |
2802 | if (!direntp) | |
2803 | break; | |
2804 | ||
2805 | if (!strcmp(direntp->d_name, ".")) | |
2806 | continue; | |
2807 | ||
2808 | if (!strcmp(direntp->d_name, "..")) | |
2809 | continue; | |
2810 | ||
2811 | ret = snprintf(path2, MAXPATHLEN, "%s/%s/config", snappath, direntp->d_name); | |
2812 | if (ret < 0 || ret >= MAXPATHLEN) { | |
2813 | ERROR("pathname too long"); | |
2814 | goto out_free; | |
2815 | } | |
2816 | if (!file_exists(path2)) | |
2817 | continue; | |
2818 | nsnaps = realloc(snaps, (count + 1)*sizeof(*snaps)); | |
2819 | if (!nsnaps) { | |
2820 | SYSERROR("Out of memory"); | |
2821 | goto out_free; | |
2822 | } | |
2823 | snaps = nsnaps; | |
2824 | snaps[count].free = lxcsnap_free; | |
2825 | snaps[count].name = strdup(direntp->d_name); | |
2826 | if (!snaps[count].name) | |
2827 | goto out_free; | |
2828 | snaps[count].lxcpath = strdup(snappath); | |
2829 | if (!snaps[count].lxcpath) { | |
2830 | free(snaps[count].name); | |
2831 | goto out_free; | |
2832 | } | |
2833 | snaps[count].comment_pathname = get_snapcomment_path(snappath, direntp->d_name); | |
2834 | snaps[count].timestamp = get_timestamp(snappath, direntp->d_name); | |
2835 | count++; | |
2836 | } | |
2837 | ||
025ed0f3 | 2838 | process_lock(); |
f5dd1d53 SH |
2839 | if (closedir(dir)) |
2840 | WARN("failed to close directory"); | |
025ed0f3 | 2841 | process_unlock(); |
f5dd1d53 SH |
2842 | |
2843 | *ret_snaps = snaps; | |
2844 | return count; | |
2845 | ||
2846 | out_free: | |
2847 | if (snaps) { | |
2848 | int i; | |
2849 | for (i=0; i<count; i++) | |
2850 | lxcsnap_free(&snaps[i]); | |
2851 | free(snaps); | |
2852 | } | |
9baa57bd SH |
2853 | process_lock(); |
2854 | if (closedir(dir)) | |
2855 | WARN("failed to close directory"); | |
2856 | process_unlock(); | |
f5dd1d53 SH |
2857 | return -1; |
2858 | } | |
2859 | ||
2860 | static bool lxcapi_snapshot_restore(struct lxc_container *c, char *snapname, char *newname) | |
2861 | { | |
2862 | char clonelxcpath[MAXPATHLEN]; | |
2863 | int ret; | |
2864 | struct lxc_container *snap, *rest; | |
2865 | struct bdev *bdev; | |
2866 | bool b = false; | |
2867 | ||
2868 | if (!c || !c->name || !c->config_path) | |
2869 | return false; | |
2870 | ||
2871 | bdev = bdev_init(c->lxc_conf->rootfs.path, c->lxc_conf->rootfs.mount, NULL); | |
2872 | if (!bdev) { | |
2873 | ERROR("Failed to find original backing store type"); | |
2874 | return false; | |
2875 | } | |
2876 | ||
2877 | if (!newname) | |
2878 | newname = c->name; | |
2879 | if (strcmp(c->name, newname) == 0) { | |
2880 | if (!lxcapi_destroy(c)) { | |
2881 | ERROR("Could not destroy existing container %s", newname); | |
2882 | bdev_put(bdev); | |
2883 | return false; | |
2884 | } | |
2885 | } | |
2886 | ret = snprintf(clonelxcpath, MAXPATHLEN, "%ssnaps/%s", c->config_path, c->name); | |
2887 | if (ret < 0 || ret >= MAXPATHLEN) { | |
2888 | bdev_put(bdev); | |
2889 | return false; | |
2890 | } | |
2891 | // how should we lock this? | |
2892 | ||
2893 | snap = lxc_container_new(snapname, clonelxcpath); | |
2894 | if (!snap || !lxcapi_is_defined(snap)) { | |
2895 | ERROR("Could not open snapshot %s", snapname); | |
2896 | if (snap) lxc_container_put(snap); | |
2897 | bdev_put(bdev); | |
2898 | return false; | |
2899 | } | |
2900 | ||
2901 | rest = lxcapi_clone(snap, newname, c->config_path, 0, bdev->type, NULL, 0, NULL); | |
2902 | bdev_put(bdev); | |
2903 | if (rest && lxcapi_is_defined(rest)) | |
2904 | b = true; | |
2905 | if (rest) | |
2906 | lxc_container_put(rest); | |
2907 | lxc_container_put(snap); | |
2908 | return b; | |
2909 | } | |
2910 | ||
771d96b3 ÇO |
2911 | static bool lxcapi_snapshot_destroy(struct lxc_container *c, char *snapname) |
2912 | { | |
2913 | int ret; | |
2914 | char clonelxcpath[MAXPATHLEN]; | |
2915 | struct lxc_container *snap = NULL; | |
2916 | ||
2917 | if (!c || !c->name || !c->config_path) | |
2918 | return false; | |
2919 | ||
2920 | ret = snprintf(clonelxcpath, MAXPATHLEN, "%ssnaps/%s", c->config_path, c->name); | |
2921 | if (ret < 0 || ret >= MAXPATHLEN) | |
2922 | goto err; | |
2923 | ||
2924 | snap = lxc_container_new(snapname, clonelxcpath); | |
2925 | if (!snap || !lxcapi_is_defined(snap)) { | |
2926 | ERROR("Could not find snapshot %s", snapname); | |
2927 | goto err; | |
2928 | } | |
2929 | ||
2930 | if (!lxcapi_destroy(snap)) { | |
2931 | ERROR("Could not destroy snapshot %s", snapname); | |
2932 | goto err; | |
2933 | } | |
2934 | lxc_container_put(snap); | |
2935 | ||
2936 | return true; | |
2937 | err: | |
2938 | if (snap) | |
2939 | lxc_container_put(snap); | |
2940 | return false; | |
2941 | } | |
2942 | ||
b494d2dd SH |
2943 | static bool lxcapi_may_control(struct lxc_container *c) |
2944 | { | |
2945 | return lxc_try_cmd(c->name, c->config_path) == 0; | |
2946 | } | |
2947 | ||
a9a0ed90 ÇO |
2948 | static bool add_remove_device_node(struct lxc_container *c, char *src_path, char *dest_path, bool add) |
2949 | { | |
2950 | int ret; | |
2951 | struct stat st; | |
2952 | char path[MAXPATHLEN]; | |
2953 | char value[MAX_BUFFER]; | |
2954 | char *directory_path = NULL, *p; | |
2955 | ||
2956 | /* make sure container is running */ | |
2957 | if (!c->is_running(c)) { | |
2958 | ERROR("container is not running"); | |
2959 | goto out; | |
2960 | } | |
2961 | ||
2962 | /* use src_path if dest_path is NULL otherwise use dest_path */ | |
2963 | p = dest_path ? dest_path : src_path; | |
2964 | ||
2965 | /* prepare the path */ | |
2966 | ret = snprintf(path, MAXPATHLEN, "/proc/%d/root/%s", c->init_pid(c), p); | |
2967 | if (ret < 0 || ret >= MAXPATHLEN) | |
2968 | goto out; | |
2969 | remove_trailing_slashes(path); | |
2970 | ||
2971 | p = add ? src_path : path; | |
2972 | /* make sure we can access p */ | |
2973 | if(access(p, F_OK) < 0 || stat(p, &st) < 0) | |
2974 | goto out; | |
2975 | ||
2976 | /* continue if path is character device or block device */ | |
c6a9b0d7 | 2977 | if (S_ISCHR(st.st_mode)) |
a9a0ed90 | 2978 | ret = snprintf(value, MAX_BUFFER, "c %d:%d rwm", major(st.st_rdev), minor(st.st_rdev)); |
c6a9b0d7 | 2979 | else if (S_ISBLK(st.st_mode)) |
a9a0ed90 ÇO |
2980 | ret = snprintf(value, MAX_BUFFER, "b %d:%d rwm", major(st.st_rdev), minor(st.st_rdev)); |
2981 | else | |
2982 | goto out; | |
2983 | ||
2984 | /* check snprintf return code */ | |
2985 | if (ret < 0 || ret >= MAX_BUFFER) | |
2986 | goto out; | |
2987 | ||
2988 | directory_path = dirname(strdup(path)); | |
2989 | /* remove path and directory_path (if empty) */ | |
2990 | if(access(path, F_OK) == 0) { | |
2991 | if (unlink(path) < 0) { | |
2992 | ERROR("unlink failed"); | |
2993 | goto out; | |
2994 | } | |
2995 | if (rmdir(directory_path) < 0 && errno != ENOTEMPTY) { | |
2996 | ERROR("rmdir failed"); | |
2997 | goto out; | |
2998 | } | |
2999 | } | |
3000 | ||
3001 | if (add) { | |
3002 | /* create the missing directories */ | |
3003 | if (mkdir_p(directory_path, 0755) < 0) { | |
3004 | ERROR("failed to create directory"); | |
3005 | goto out; | |
3006 | } | |
3007 | ||
3008 | /* create the device node */ | |
3009 | if (mknod(path, st.st_mode, st.st_rdev) < 0) { | |
3010 | ERROR("mknod failed"); | |
3011 | goto out; | |
3012 | } | |
3013 | ||
3014 | /* add device node to device list */ | |
3015 | if (!c->set_cgroup_item(c, "devices.allow", value)) { | |
3016 | ERROR("set_cgroup_item failed while adding the device node"); | |
3017 | goto out; | |
3018 | } | |
3019 | } else { | |
3020 | /* remove device node from device list */ | |
3021 | if (!c->set_cgroup_item(c, "devices.deny", value)) { | |
3022 | ERROR("set_cgroup_item failed while removing the device node"); | |
3023 | goto out; | |
3024 | } | |
3025 | } | |
3026 | return true; | |
3027 | out: | |
3028 | if (directory_path) | |
3029 | free(directory_path); | |
3030 | return false; | |
3031 | } | |
3032 | ||
3033 | static bool lxcapi_add_device_node(struct lxc_container *c, char *src_path, char *dest_path) | |
3034 | { | |
3035 | return add_remove_device_node(c, src_path, dest_path, true); | |
3036 | } | |
3037 | ||
3038 | static bool lxcapi_remove_device_node(struct lxc_container *c, char *src_path, char *dest_path) | |
3039 | { | |
3040 | return add_remove_device_node(c, src_path, dest_path, false); | |
3041 | } | |
3042 | ||
a0e93eeb CS |
3043 | static int lxcapi_attach_run_waitl(struct lxc_container *c, lxc_attach_options_t *options, const char *program, const char *arg, ...) |
3044 | { | |
3045 | va_list ap; | |
3046 | const char **argv; | |
3047 | int ret; | |
3048 | ||
3049 | if (!c) | |
3050 | return -1; | |
3051 | ||
3052 | va_start(ap, arg); | |
3053 | argv = lxc_va_arg_list_to_argv_const(ap, 1); | |
3054 | va_end(ap); | |
3055 | ||
3056 | if (!argv) { | |
3057 | ERROR("Memory allocation error."); | |
3058 | return -1; | |
3059 | } | |
3060 | argv[0] = arg; | |
3061 | ||
3062 | ret = lxcapi_attach_run_wait(c, options, program, (const char * const *)argv); | |
3063 | free((void*)argv); | |
3064 | return ret; | |
3065 | } | |
3066 | ||
afeecbba | 3067 | struct lxc_container *lxc_container_new(const char *name, const char *configpath) |
72d0e1cb SG |
3068 | { |
3069 | struct lxc_container *c; | |
72d0e1cb SG |
3070 | |
3071 | c = malloc(sizeof(*c)); | |
3072 | if (!c) { | |
3073 | fprintf(stderr, "failed to malloc lxc_container\n"); | |
3074 | return NULL; | |
3075 | } | |
3076 | memset(c, 0, sizeof(*c)); | |
3077 | ||
afeecbba SH |
3078 | if (configpath) |
3079 | c->config_path = strdup(configpath); | |
3080 | else | |
67e571de | 3081 | c->config_path = strdup(default_lxc_path()); |
afeecbba | 3082 | |
2a59a681 SH |
3083 | if (!c->config_path) { |
3084 | fprintf(stderr, "Out of memory"); | |
3085 | goto err; | |
3086 | } | |
3087 | ||
f5dd1d53 | 3088 | remove_trailing_slashes(c->config_path); |
72d0e1cb SG |
3089 | c->name = malloc(strlen(name)+1); |
3090 | if (!c->name) { | |
3091 | fprintf(stderr, "Error allocating lxc_container name\n"); | |
3092 | goto err; | |
3093 | } | |
3094 | strcpy(c->name, name); | |
3095 | ||
3096 | c->numthreads = 1; | |
df271a59 | 3097 | if (!(c->slock = lxc_newlock(c->config_path, name))) { |
72d0e1cb SG |
3098 | fprintf(stderr, "failed to create lock\n"); |
3099 | goto err; | |
3100 | } | |
3101 | ||
df271a59 | 3102 | if (!(c->privlock = lxc_newlock(NULL, NULL))) { |
72d0e1cb SG |
3103 | fprintf(stderr, "failed to alloc privlock\n"); |
3104 | goto err; | |
3105 | } | |
3106 | ||
afeecbba | 3107 | if (!set_config_filename(c)) { |
72d0e1cb SG |
3108 | fprintf(stderr, "Error allocating config file pathname\n"); |
3109 | goto err; | |
3110 | } | |
72d0e1cb SG |
3111 | |
3112 | if (file_exists(c->configfile)) | |
3113 | lxcapi_load_config(c, NULL); | |
3114 | ||
3e625e2d SH |
3115 | if (ongoing_create(c) == 2) { |
3116 | ERROR("Error: %s creation was not completed", c->name); | |
1897e3bc | 3117 | lxcapi_destroy(c); |
4df7f012 | 3118 | lxcapi_clear_config(c); |
3e625e2d SH |
3119 | } |
3120 | ||
72d0e1cb SG |
3121 | // assign the member functions |
3122 | c->is_defined = lxcapi_is_defined; | |
3123 | c->state = lxcapi_state; | |
3124 | c->is_running = lxcapi_is_running; | |
3125 | c->freeze = lxcapi_freeze; | |
3126 | c->unfreeze = lxcapi_unfreeze; | |
0115f8fd | 3127 | c->console = lxcapi_console; |
b5159817 | 3128 | c->console_getfd = lxcapi_console_getfd; |
72d0e1cb SG |
3129 | c->init_pid = lxcapi_init_pid; |
3130 | c->load_config = lxcapi_load_config; | |
3131 | c->want_daemonize = lxcapi_want_daemonize; | |
130a1888 | 3132 | c->want_close_all_fds = lxcapi_want_close_all_fds; |
72d0e1cb SG |
3133 | c->start = lxcapi_start; |
3134 | c->startl = lxcapi_startl; | |
3135 | c->stop = lxcapi_stop; | |
3136 | c->config_file_name = lxcapi_config_file_name; | |
3137 | c->wait = lxcapi_wait; | |
3138 | c->set_config_item = lxcapi_set_config_item; | |
3139 | c->destroy = lxcapi_destroy; | |
3140 | c->save_config = lxcapi_save_config; | |
3141 | c->get_keys = lxcapi_get_keys; | |
3142 | c->create = lxcapi_create; | |
3143 | c->createl = lxcapi_createl; | |
3144 | c->shutdown = lxcapi_shutdown; | |
3e625e2d | 3145 | c->reboot = lxcapi_reboot; |
4df7f012 | 3146 | c->clear_config = lxcapi_clear_config; |
72d0e1cb SG |
3147 | c->clear_config_item = lxcapi_clear_config_item; |
3148 | c->get_config_item = lxcapi_get_config_item; | |
794dd120 SH |
3149 | c->get_cgroup_item = lxcapi_get_cgroup_item; |
3150 | c->set_cgroup_item = lxcapi_set_cgroup_item; | |
2a59a681 SH |
3151 | c->get_config_path = lxcapi_get_config_path; |
3152 | c->set_config_path = lxcapi_set_config_path; | |
9be53773 | 3153 | c->clone = lxcapi_clone; |
799f29ab | 3154 | c->get_interfaces = lxcapi_get_interfaces; |
9c83a661 | 3155 | c->get_ips = lxcapi_get_ips; |
a0e93eeb CS |
3156 | c->attach = lxcapi_attach; |
3157 | c->attach_run_wait = lxcapi_attach_run_wait; | |
3158 | c->attach_run_waitl = lxcapi_attach_run_waitl; | |
f5dd1d53 SH |
3159 | c->snapshot = lxcapi_snapshot; |
3160 | c->snapshot_list = lxcapi_snapshot_list; | |
3161 | c->snapshot_restore = lxcapi_snapshot_restore; | |
771d96b3 | 3162 | c->snapshot_destroy = lxcapi_snapshot_destroy; |
b494d2dd | 3163 | c->may_control = lxcapi_may_control; |
a9a0ed90 ÇO |
3164 | c->add_device_node = lxcapi_add_device_node; |
3165 | c->remove_device_node = lxcapi_remove_device_node; | |
72d0e1cb SG |
3166 | |
3167 | /* we'll allow the caller to update these later */ | |
ab1bf971 | 3168 | if (lxc_log_init(NULL, "none", NULL, "lxc_container", 0, c->config_path)) { |
72d0e1cb SG |
3169 | fprintf(stderr, "failed to open log\n"); |
3170 | goto err; | |
3171 | } | |
3172 | ||
72d0e1cb SG |
3173 | return c; |
3174 | ||
3175 | err: | |
3176 | lxc_container_free(c); | |
3177 | return NULL; | |
3178 | } | |
3179 | ||
4a7c7daa | 3180 | int lxc_get_wait_states(const char **states) |
72d0e1cb SG |
3181 | { |
3182 | int i; | |
3183 | ||
3184 | if (states) | |
3185 | for (i=0; i<MAX_STATE; i++) | |
3186 | states[i] = lxc_state2str(i); | |
3187 | return MAX_STATE; | |
3188 | } | |
a41f104b | 3189 | |
a41f104b SH |
3190 | /* |
3191 | * These next two could probably be done smarter with reusing a common function | |
3192 | * with different iterators and tests... | |
3193 | */ | |
3194 | int list_defined_containers(const char *lxcpath, char ***names, struct lxc_container ***cret) | |
3195 | { | |
3196 | DIR *dir; | |
3197 | int i, cfound = 0, nfound = 0; | |
3198 | struct dirent dirent, *direntp; | |
3199 | struct lxc_container *c; | |
3200 | ||
3201 | if (!lxcpath) | |
3202 | lxcpath = default_lxc_path(); | |
3203 | ||
3204 | process_lock(); | |
3205 | dir = opendir(lxcpath); | |
3206 | process_unlock(); | |
3207 | ||
3208 | if (!dir) { | |
3209 | SYSERROR("opendir on lxcpath"); | |
3210 | return -1; | |
3211 | } | |
3212 | ||
3213 | if (cret) | |
3214 | *cret = NULL; | |
3215 | if (names) | |
3216 | *names = NULL; | |
3217 | ||
3218 | while (!readdir_r(dir, &dirent, &direntp)) { | |
3219 | if (!direntp) | |
3220 | break; | |
3221 | if (!strcmp(direntp->d_name, ".")) | |
3222 | continue; | |
3223 | if (!strcmp(direntp->d_name, "..")) | |
3224 | continue; | |
3225 | ||
3226 | if (!config_file_exists(lxcpath, direntp->d_name)) | |
3227 | continue; | |
3228 | ||
3229 | if (names) { | |
9c88ff1f | 3230 | if (!add_to_array(names, direntp->d_name, cfound)) |
a41f104b SH |
3231 | goto free_bad; |
3232 | } | |
3233 | cfound++; | |
3234 | ||
3235 | if (!cret) { | |
3236 | nfound++; | |
3237 | continue; | |
3238 | } | |
3239 | ||
3240 | c = lxc_container_new(direntp->d_name, lxcpath); | |
3241 | if (!c) { | |
3242 | INFO("Container %s:%s has a config but could not be loaded", | |
3243 | lxcpath, direntp->d_name); | |
3244 | if (names) | |
9c88ff1f ÇO |
3245 | if(!remove_from_array(names, direntp->d_name, cfound--)) |
3246 | goto free_bad; | |
a41f104b SH |
3247 | continue; |
3248 | } | |
3249 | if (!lxcapi_is_defined(c)) { | |
3250 | INFO("Container %s:%s has a config but is not defined", | |
3251 | lxcpath, direntp->d_name); | |
3252 | if (names) | |
9c88ff1f ÇO |
3253 | if(!remove_from_array(names, direntp->d_name, cfound--)) |
3254 | goto free_bad; | |
a41f104b SH |
3255 | lxc_container_put(c); |
3256 | continue; | |
3257 | } | |
3258 | ||
2871830a | 3259 | if (!add_to_clist(cret, c, nfound, true)) { |
a41f104b SH |
3260 | lxc_container_put(c); |
3261 | goto free_bad; | |
3262 | } | |
3263 | nfound++; | |
3264 | } | |
3265 | ||
3266 | process_lock(); | |
3267 | closedir(dir); | |
3268 | process_unlock(); | |
3269 | return nfound; | |
3270 | ||
3271 | free_bad: | |
3272 | if (names && *names) { | |
3273 | for (i=0; i<cfound; i++) | |
3274 | free((*names)[i]); | |
3275 | free(*names); | |
3276 | } | |
3277 | if (cret && *cret) { | |
3278 | for (i=0; i<nfound; i++) | |
3279 | lxc_container_put((*cret)[i]); | |
3280 | free(*cret); | |
3281 | } | |
3282 | process_lock(); | |
3283 | closedir(dir); | |
3284 | process_unlock(); | |
3285 | return -1; | |
3286 | } | |
3287 | ||
148a9d27 DE |
3288 | int list_active_containers(const char *lxcpath, char ***nret, |
3289 | struct lxc_container ***cret) | |
a41f104b | 3290 | { |
148a9d27 | 3291 | int i, ret = -1, cret_cnt = 0, ct_name_cnt = 0; |
a41f104b SH |
3292 | int lxcpath_len; |
3293 | char *line = NULL; | |
148a9d27 | 3294 | char **ct_name = NULL; |
a41f104b SH |
3295 | size_t len = 0; |
3296 | struct lxc_container *c; | |
3297 | ||
3298 | if (!lxcpath) | |
3299 | lxcpath = default_lxc_path(); | |
3300 | lxcpath_len = strlen(lxcpath); | |
3301 | ||
3302 | if (cret) | |
3303 | *cret = NULL; | |
148a9d27 DE |
3304 | if (nret) |
3305 | *nret = NULL; | |
a41f104b SH |
3306 | |
3307 | process_lock(); | |
3308 | FILE *f = fopen("/proc/net/unix", "r"); | |
3309 | process_unlock(); | |
3310 | if (!f) | |
3311 | return -1; | |
3312 | ||
3313 | while (getline(&line, &len, f) != -1) { | |
0f8f9c8a | 3314 | char *p = strrchr(line, ' '), *p2; |
a41f104b SH |
3315 | if (!p) |
3316 | continue; | |
3317 | p++; | |
3318 | if (*p != 0x40) | |
3319 | continue; | |
3320 | p++; | |
3321 | if (strncmp(p, lxcpath, lxcpath_len) != 0) | |
3322 | continue; | |
3323 | p += lxcpath_len; | |
3324 | while (*p == '/') | |
3325 | p++; | |
3326 | ||
3327 | // Now p is the start of lxc_name | |
3328 | p2 = index(p, '/'); | |
3329 | if (!p2 || strncmp(p2, "/command", 8) != 0) | |
3330 | continue; | |
3331 | *p2 = '\0'; | |
3332 | ||
148a9d27 | 3333 | if (array_contains(&ct_name, p, ct_name_cnt)) |
9c88ff1f ÇO |
3334 | continue; |
3335 | ||
148a9d27 DE |
3336 | if (!add_to_array(&ct_name, p, ct_name_cnt)) |
3337 | goto free_cret_list; | |
9c88ff1f | 3338 | |
148a9d27 | 3339 | ct_name_cnt++; |
a41f104b | 3340 | |
148a9d27 | 3341 | if (!cret) |
a41f104b | 3342 | continue; |
a41f104b SH |
3343 | |
3344 | c = lxc_container_new(p, lxcpath); | |
3345 | if (!c) { | |
3346 | INFO("Container %s:%s is running but could not be loaded", | |
3347 | lxcpath, p); | |
148a9d27 | 3348 | remove_from_array(&ct_name, p, ct_name_cnt--); |
a41f104b SH |
3349 | continue; |
3350 | } | |
3351 | ||
3352 | /* | |
3353 | * If this is an anonymous container, then is_defined *can* | |
3354 | * return false. So we don't do that check. Count on the | |
3355 | * fact that the command socket exists. | |
3356 | */ | |
3357 | ||
148a9d27 | 3358 | if (!add_to_clist(cret, c, cret_cnt, true)) { |
a41f104b | 3359 | lxc_container_put(c); |
148a9d27 | 3360 | goto free_cret_list; |
a41f104b | 3361 | } |
148a9d27 | 3362 | cret_cnt++; |
a41f104b SH |
3363 | } |
3364 | ||
148a9d27 DE |
3365 | assert(!nret || !cret || cret_cnt == ct_name_cnt); |
3366 | ret = ct_name_cnt; | |
3367 | if (nret) | |
3368 | *nret = ct_name; | |
3369 | else | |
3370 | goto free_ct_name; | |
3371 | goto out; | |
a41f104b | 3372 | |
148a9d27 | 3373 | free_cret_list: |
a41f104b | 3374 | if (cret && *cret) { |
148a9d27 | 3375 | for (i = 0; i < cret_cnt; i++) |
a41f104b SH |
3376 | lxc_container_put((*cret)[i]); |
3377 | free(*cret); | |
3378 | } | |
148a9d27 DE |
3379 | |
3380 | free_ct_name: | |
3381 | if (ct_name) { | |
3382 | for (i = 0; i < ct_name_cnt; i++) | |
3383 | free(ct_name[i]); | |
3384 | free(ct_name); | |
3385 | } | |
3386 | ||
3387 | out: | |
e853a32d ÇO |
3388 | if (line) |
3389 | free(line); | |
3390 | ||
a41f104b SH |
3391 | process_lock(); |
3392 | fclose(f); | |
3393 | process_unlock(); | |
148a9d27 | 3394 | return ret; |
a41f104b | 3395 | } |
2871830a DE |
3396 | |
3397 | int list_all_containers(const char *lxcpath, char ***nret, | |
3398 | struct lxc_container ***cret) | |
3399 | { | |
3400 | int i, ret, active_cnt, ct_cnt, ct_list_cnt; | |
3401 | char **active_name; | |
3402 | char **ct_name; | |
3403 | struct lxc_container **ct_list = NULL; | |
3404 | ||
3405 | ct_cnt = list_defined_containers(lxcpath, &ct_name, NULL); | |
3406 | if (ct_cnt < 0) | |
3407 | return ct_cnt; | |
3408 | ||
3409 | active_cnt = list_active_containers(lxcpath, &active_name, NULL); | |
3410 | if (active_cnt < 0) { | |
3411 | ret = active_cnt; | |
3412 | goto free_ct_name; | |
3413 | } | |
3414 | ||
3415 | for (i = 0; i < active_cnt; i++) { | |
3416 | if (!array_contains(&ct_name, active_name[i], ct_cnt)) { | |
3417 | if (!add_to_array(&ct_name, active_name[i], ct_cnt)) { | |
3418 | ret = -1; | |
3419 | goto free_active_name; | |
3420 | } | |
3421 | ct_cnt++; | |
3422 | } | |
3423 | free(active_name[i]); | |
3424 | active_name[i] = NULL; | |
3425 | } | |
3426 | free(active_name); | |
3427 | active_name = NULL; | |
3428 | active_cnt = 0; | |
3429 | ||
3430 | for (i = 0, ct_list_cnt = 0; i < ct_cnt && cret; i++) { | |
3431 | struct lxc_container *c; | |
3432 | ||
3433 | c = lxc_container_new(ct_name[i], lxcpath); | |
3434 | if (!c) { | |
3435 | WARN("Container %s:%s could not be loaded", lxcpath, ct_name[i]); | |
3436 | remove_from_array(&ct_name, ct_name[i], ct_cnt--); | |
3437 | continue; | |
3438 | } | |
3439 | ||
3440 | if (!add_to_clist(&ct_list, c, ct_list_cnt, false)) { | |
3441 | lxc_container_put(c); | |
3442 | ret = -1; | |
3443 | goto free_ct_list; | |
3444 | } | |
3445 | ct_list_cnt++; | |
3446 | } | |
3447 | ||
3448 | if (cret) | |
3449 | *cret = ct_list; | |
3450 | ||
3451 | if (nret) | |
3452 | *nret = ct_name; | |
3453 | else { | |
3454 | ret = ct_cnt; | |
3455 | goto free_ct_name; | |
3456 | } | |
3457 | return ct_cnt; | |
3458 | ||
3459 | free_ct_list: | |
3460 | for (i = 0; i < ct_list_cnt; i++) { | |
3461 | lxc_container_put(ct_list[i]); | |
3462 | } | |
3463 | if (ct_list) | |
3464 | free(ct_list); | |
3465 | ||
3466 | free_active_name: | |
3467 | for (i = 0; i < active_cnt; i++) { | |
3468 | if (active_name[i]) | |
3469 | free(active_name[i]); | |
3470 | } | |
3471 | if (active_name) | |
3472 | free(active_name); | |
3473 | ||
3474 | free_ct_name: | |
3475 | for (i = 0; i < ct_cnt; i++) { | |
3476 | free(ct_name[i]); | |
3477 | } | |
3478 | free(ct_name); | |
3479 | return ret; | |
3480 | } |