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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> |
f2363e38 ÇO |
33 | #include <sched.h> |
34 | #include <arpa/inet.h> | |
35 | #include <libgen.h> | |
d659597e | 36 | #include <stdint.h> |
c476bdce | 37 | #include <grp.h> |
5f7eba0b | 38 | #include <sys/syscall.h> |
f2363e38 ÇO |
39 | |
40 | #include <lxc/lxccontainer.h> | |
41 | #include <lxc/version.h> | |
42 | ||
9be53773 | 43 | #include "config.h" |
72d0e1cb SG |
44 | #include "lxc.h" |
45 | #include "state.h" | |
72d0e1cb | 46 | #include "conf.h" |
72d0e1cb | 47 | #include "confile.h" |
b5159817 | 48 | #include "console.h" |
72d0e1cb SG |
49 | #include "cgroup.h" |
50 | #include "commands.h" | |
51 | #include "log.h" | |
9be53773 | 52 | #include "bdev.h" |
6a44839f | 53 | #include "utils.h" |
a0e93eeb | 54 | #include "attach.h" |
f2363e38 ÇO |
55 | #include "monitor.h" |
56 | #include "namespace.h" | |
95ee490b | 57 | #include "lxclock.h" |
4ba0d9af SG |
58 | |
59 | #if HAVE_IFADDRS_H | |
9c83a661 | 60 | #include <ifaddrs.h> |
4ba0d9af SG |
61 | #else |
62 | #include <../include/ifaddrs.h> | |
63 | #endif | |
72d0e1cb | 64 | |
a9a0ed90 ÇO |
65 | #define MAX_BUFFER 4096 |
66 | ||
c868b261 ÇO |
67 | #define NOT_SUPPORTED_ERROR "the requested function %s is not currently supported with unprivileged containers" |
68 | ||
5f7eba0b SG |
69 | /* Define faccessat() if missing from the C library */ |
70 | #ifndef HAVE_FACCESSAT | |
71 | static int faccessat(int __fd, const char *__file, int __type, int __flag) | |
72 | { | |
73 | #ifdef __NR_faccessat | |
74 | return syscall(__NR_faccessat, __fd, __file, __type, __flag); | |
75 | #else | |
76 | errno = ENOSYS; | |
77 | return -1; | |
78 | #endif | |
79 | } | |
80 | #endif | |
81 | ||
82 | ||
72d0e1cb SG |
83 | lxc_log_define(lxc_container, lxc); |
84 | ||
a41f104b SH |
85 | static bool config_file_exists(const char *lxcpath, const char *cname) |
86 | { | |
87 | /* $lxcpath + '/' + $cname + '/config' + \0 */ | |
88 | int ret, len = strlen(lxcpath) + strlen(cname) + 9; | |
89 | char *fname = alloca(len); | |
90 | ||
91 | ret = snprintf(fname, len, "%s/%s/config", lxcpath, cname); | |
92 | if (ret < 0 || ret >= len) | |
93 | return false; | |
94 | ||
95 | return file_exists(fname); | |
96 | } | |
97 | ||
3e625e2d SH |
98 | /* |
99 | * A few functions to help detect when a container creation failed. | |
100 | * If a container creation was killed partway through, then trying | |
101 | * to actually start that container could harm the host. We detect | |
102 | * this by creating a 'partial' file under the container directory, | |
103 | * and keeping an advisory lock. When container creation completes, | |
104 | * we remove that file. When we load or try to start a container, if | |
105 | * we find that file, without a flock, we remove the container. | |
106 | */ | |
74a3920a | 107 | static int ongoing_create(struct lxc_container *c) |
3e625e2d SH |
108 | { |
109 | int len = strlen(c->config_path) + strlen(c->name) + 10; | |
110 | char *path = alloca(len); | |
111 | int fd, ret; | |
93dc5327 SH |
112 | struct flock lk; |
113 | ||
3e625e2d SH |
114 | ret = snprintf(path, len, "%s/%s/partial", c->config_path, c->name); |
115 | if (ret < 0 || ret >= len) { | |
116 | ERROR("Error writing partial pathname"); | |
117 | return -1; | |
118 | } | |
119 | ||
120 | if (!file_exists(path)) | |
121 | return 0; | |
025ed0f3 | 122 | fd = open(path, O_RDWR); |
025ed0f3 | 123 | if (fd < 0) { |
3e625e2d SH |
124 | // give benefit of the doubt |
125 | SYSERROR("Error opening partial file"); | |
3e625e2d SH |
126 | return 0; |
127 | } | |
93dc5327 SH |
128 | lk.l_type = F_WRLCK; |
129 | lk.l_whence = SEEK_SET; | |
130 | lk.l_start = 0; | |
131 | lk.l_len = 0; | |
132 | lk.l_pid = -1; | |
133 | if (fcntl(fd, F_GETLK, &lk) == 0 && lk.l_pid != -1) { | |
3e625e2d SH |
134 | // create is still ongoing |
135 | close(fd); | |
3e625e2d SH |
136 | return 1; |
137 | } | |
138 | // create completed but partial is still there. | |
139 | close(fd); | |
3e625e2d SH |
140 | return 2; |
141 | } | |
142 | ||
74a3920a | 143 | static int create_partial(struct lxc_container *c) |
3e625e2d SH |
144 | { |
145 | // $lxcpath + '/' + $name + '/partial' + \0 | |
146 | int len = strlen(c->config_path) + strlen(c->name) + 10; | |
147 | char *path = alloca(len); | |
148 | int fd, ret; | |
93dc5327 SH |
149 | struct flock lk; |
150 | ||
3e625e2d SH |
151 | ret = snprintf(path, len, "%s/%s/partial", c->config_path, c->name); |
152 | if (ret < 0 || ret >= len) { | |
153 | ERROR("Error writing partial pathname"); | |
154 | return -1; | |
155 | } | |
93dc5327 | 156 | if ((fd=open(path, O_RDWR | O_CREAT | O_EXCL, 0755)) < 0) { |
3e625e2d | 157 | SYSERROR("Erorr creating partial file"); |
3e625e2d SH |
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); | |
3e625e2d SH |
167 | return -1; |
168 | } | |
3e625e2d SH |
169 | |
170 | return fd; | |
171 | } | |
172 | ||
74a3920a | 173 | static void remove_partial(struct lxc_container *c, int fd) |
3e625e2d SH |
174 | { |
175 | // $lxcpath + '/' + $name + '/partial' + \0 | |
176 | int len = strlen(c->config_path) + strlen(c->name) + 10; | |
177 | char *path = alloca(len); | |
178 | int ret; | |
179 | ||
180 | close(fd); | |
181 | ret = snprintf(path, len, "%s/%s/partial", c->config_path, c->name); | |
182 | if (ret < 0 || ret >= len) { | |
183 | ERROR("Error writing partial pathname"); | |
184 | return; | |
185 | } | |
3e625e2d SH |
186 | if (unlink(path) < 0) |
187 | SYSERROR("Error unlink partial file %s", path); | |
3e625e2d SH |
188 | } |
189 | ||
72d0e1cb | 190 | /* LOCKING |
3bc449ed SH |
191 | * 1. container_mem_lock(c) protects the struct lxc_container from multiple threads. |
192 | * 2. container_disk_lock(c) protects the on-disk container data - in particular the | |
193 | * container configuration file. | |
194 | * The container_disk_lock also takes the container_mem_lock. | |
195 | * 3. thread_mutex protects process data (ex: fd table) from multiple threads. | |
72d0e1cb SG |
196 | * NOTHING mutexes two independent programs with their own struct |
197 | * lxc_container for the same c->name, between API calls. For instance, | |
198 | * c->config_read(); c->start(); Between those calls, data on disk | |
199 | * could change (which shouldn't bother the caller unless for instance | |
200 | * the rootfs get moved). c->config_read(); update; c->config_write(); | |
201 | * Two such updaters could race. The callers should therefore check their | |
202 | * results. Trying to prevent that would necessarily expose us to deadlocks | |
203 | * due to hung callers. So I prefer to keep the locks only within our own | |
204 | * functions, not across functions. | |
205 | * | |
3bc449ed | 206 | * If you're going to clone while holding a lxccontainer, increment |
72d0e1cb SG |
207 | * c->numthreads (under privlock) before forking. When deleting, |
208 | * decrement numthreads under privlock, then if it hits 0 you can delete. | |
209 | * Do not ever use a lxccontainer whose numthreads you did not bump. | |
210 | */ | |
211 | ||
212 | static void lxc_container_free(struct lxc_container *c) | |
213 | { | |
214 | if (!c) | |
215 | return; | |
216 | ||
217 | if (c->configfile) { | |
218 | free(c->configfile); | |
219 | c->configfile = NULL; | |
220 | } | |
221 | if (c->error_string) { | |
222 | free(c->error_string); | |
223 | c->error_string = NULL; | |
224 | } | |
d95db067 | 225 | if (c->slock) { |
df271a59 | 226 | lxc_putlock(c->slock); |
d95db067 DE |
227 | c->slock = NULL; |
228 | } | |
72d0e1cb | 229 | if (c->privlock) { |
df271a59 | 230 | lxc_putlock(c->privlock); |
72d0e1cb SG |
231 | c->privlock = NULL; |
232 | } | |
233 | if (c->name) { | |
234 | free(c->name); | |
235 | c->name = NULL; | |
236 | } | |
d95db067 DE |
237 | if (c->lxc_conf) { |
238 | lxc_conf_free(c->lxc_conf); | |
239 | c->lxc_conf = NULL; | |
240 | } | |
2a59a681 SH |
241 | if (c->config_path) { |
242 | free(c->config_path); | |
243 | c->config_path = NULL; | |
244 | } | |
72cf75fa | 245 | |
72d0e1cb SG |
246 | free(c); |
247 | } | |
248 | ||
43d1aa34 SH |
249 | /* |
250 | * Consider the following case: | |
251 | freer | racing get()er | |
252 | ================================================================== | |
253 | lxc_container_put() | lxc_container_get() | |
254 | \ lxclock(c->privlock) | c->numthreads < 1? (no) | |
255 | \ c->numthreads = 0 | \ lxclock(c->privlock) -> waits | |
256 | \ lxcunlock() | \ | |
257 | \ lxc_container_free() | \ lxclock() returns | |
258 | | \ c->numthreads < 1 -> return 0 | |
259 | \ \ (free stuff) | | |
260 | \ \ sem_destroy(privlock) | | |
261 | ||
262 | * When the get()er checks numthreads the first time, one of the following | |
263 | * is true: | |
264 | * 1. freer has set numthreads = 0. get() returns 0 | |
265 | * 2. freer is between lxclock and setting numthreads to 0. get()er will | |
266 | * sem_wait on privlock, get lxclock after freer() drops it, then see | |
267 | * numthreads is 0 and exit without touching lxclock again.. | |
268 | * 3. freer has not yet locked privlock. If get()er runs first, then put()er | |
269 | * will see --numthreads = 1 and not call lxc_container_free(). | |
270 | */ | |
271 | ||
72d0e1cb SG |
272 | int lxc_container_get(struct lxc_container *c) |
273 | { | |
274 | if (!c) | |
275 | return 0; | |
276 | ||
43d1aa34 SH |
277 | // if someone else has already started freeing the container, don't |
278 | // try to take the lock, which may be invalid | |
279 | if (c->numthreads < 1) | |
280 | return 0; | |
281 | ||
5cee8c50 | 282 | if (container_mem_lock(c)) |
72d0e1cb SG |
283 | return 0; |
284 | if (c->numthreads < 1) { | |
285 | // bail without trying to unlock, bc the privlock is now probably | |
286 | // in freed memory | |
287 | return 0; | |
288 | } | |
289 | c->numthreads++; | |
5cee8c50 | 290 | container_mem_unlock(c); |
72d0e1cb SG |
291 | return 1; |
292 | } | |
293 | ||
294 | int lxc_container_put(struct lxc_container *c) | |
295 | { | |
296 | if (!c) | |
297 | return -1; | |
5cee8c50 | 298 | if (container_mem_lock(c)) |
72d0e1cb SG |
299 | return -1; |
300 | if (--c->numthreads < 1) { | |
5cee8c50 | 301 | container_mem_unlock(c); |
72d0e1cb SG |
302 | lxc_container_free(c); |
303 | return 1; | |
304 | } | |
5cee8c50 | 305 | container_mem_unlock(c); |
72d0e1cb SG |
306 | return 0; |
307 | } | |
308 | ||
72d0e1cb SG |
309 | static bool lxcapi_is_defined(struct lxc_container *c) |
310 | { | |
311 | struct stat statbuf; | |
312 | bool ret = false; | |
313 | int statret; | |
314 | ||
315 | if (!c) | |
316 | return false; | |
317 | ||
5cee8c50 | 318 | if (container_mem_lock(c)) |
72d0e1cb SG |
319 | return false; |
320 | if (!c->configfile) | |
321 | goto out; | |
322 | statret = stat(c->configfile, &statbuf); | |
323 | if (statret != 0) | |
324 | goto out; | |
325 | ret = true; | |
326 | ||
327 | out: | |
5cee8c50 | 328 | container_mem_unlock(c); |
72d0e1cb SG |
329 | return ret; |
330 | } | |
331 | ||
332 | static const char *lxcapi_state(struct lxc_container *c) | |
333 | { | |
72d0e1cb SG |
334 | lxc_state_t s; |
335 | ||
336 | if (!c) | |
337 | return NULL; | |
13f5be62 | 338 | s = lxc_getstate(c->name, c->config_path); |
39dc698c | 339 | return lxc_state2str(s); |
72d0e1cb SG |
340 | } |
341 | ||
39dc698c | 342 | static bool is_stopped(struct lxc_container *c) |
794dd120 SH |
343 | { |
344 | lxc_state_t s; | |
13f5be62 | 345 | s = lxc_getstate(c->name, c->config_path); |
794dd120 SH |
346 | return (s == STOPPED); |
347 | } | |
348 | ||
72d0e1cb SG |
349 | static bool lxcapi_is_running(struct lxc_container *c) |
350 | { | |
351 | const char *s; | |
352 | ||
353 | if (!c) | |
354 | return false; | |
355 | s = lxcapi_state(c); | |
356 | if (!s || strcmp(s, "STOPPED") == 0) | |
357 | return false; | |
358 | return true; | |
359 | } | |
360 | ||
361 | static bool lxcapi_freeze(struct lxc_container *c) | |
362 | { | |
363 | int ret; | |
364 | if (!c) | |
365 | return false; | |
366 | ||
9123e471 | 367 | ret = lxc_freeze(c->name, c->config_path); |
72d0e1cb SG |
368 | if (ret) |
369 | return false; | |
370 | return true; | |
371 | } | |
372 | ||
373 | static bool lxcapi_unfreeze(struct lxc_container *c) | |
374 | { | |
375 | int ret; | |
376 | if (!c) | |
377 | return false; | |
378 | ||
9123e471 | 379 | ret = lxc_unfreeze(c->name, c->config_path); |
72d0e1cb SG |
380 | if (ret) |
381 | return false; | |
382 | return true; | |
383 | } | |
384 | ||
b5159817 | 385 | static int lxcapi_console_getfd(struct lxc_container *c, int *ttynum, int *masterfd) |
0115f8fd DE |
386 | { |
387 | int ttyfd; | |
388 | if (!c) | |
389 | return -1; | |
390 | ||
b5159817 | 391 | ttyfd = lxc_console_getfd(c, ttynum, masterfd); |
0115f8fd DE |
392 | return ttyfd; |
393 | } | |
394 | ||
b5159817 DE |
395 | static int lxcapi_console(struct lxc_container *c, int ttynum, int stdinfd, |
396 | int stdoutfd, int stderrfd, int escape) | |
397 | { | |
398 | return lxc_console(c, ttynum, stdinfd, stdoutfd, stderrfd, escape); | |
399 | } | |
400 | ||
72d0e1cb SG |
401 | static pid_t lxcapi_init_pid(struct lxc_container *c) |
402 | { | |
72d0e1cb SG |
403 | if (!c) |
404 | return -1; | |
405 | ||
5cee8c50 | 406 | return lxc_cmd_get_init_pid(c->name, c->config_path); |
72d0e1cb SG |
407 | } |
408 | ||
12a50cc6 | 409 | static bool load_config_locked(struct lxc_container *c, const char *fname) |
8eb5694b SH |
410 | { |
411 | if (!c->lxc_conf) | |
412 | c->lxc_conf = lxc_conf_init(); | |
413 | if (c->lxc_conf && !lxc_config_read(fname, c->lxc_conf)) | |
414 | return true; | |
415 | return false; | |
416 | } | |
417 | ||
12a50cc6 | 418 | static bool lxcapi_load_config(struct lxc_container *c, const char *alt_file) |
72d0e1cb | 419 | { |
39dc698c SH |
420 | bool ret = false, need_disklock = false; |
421 | int lret; | |
12a50cc6 | 422 | const char *fname; |
72d0e1cb SG |
423 | if (!c) |
424 | return false; | |
425 | ||
426 | fname = c->configfile; | |
427 | if (alt_file) | |
428 | fname = alt_file; | |
429 | if (!fname) | |
430 | return false; | |
39dc698c SH |
431 | /* |
432 | * If we're reading something other than the container's config, | |
433 | * we only need to lock the in-memory container. If loading the | |
434 | * container's config file, take the disk lock. | |
435 | */ | |
436 | if (strcmp(fname, c->configfile) == 0) | |
437 | need_disklock = true; | |
438 | ||
439 | if (need_disklock) | |
440 | lret = container_disk_lock(c); | |
441 | else | |
442 | lret = container_mem_lock(c); | |
443 | if (lret) | |
72d0e1cb | 444 | return false; |
39dc698c | 445 | |
8eb5694b | 446 | ret = load_config_locked(c, fname); |
39dc698c SH |
447 | |
448 | if (need_disklock) | |
449 | container_disk_unlock(c); | |
450 | else | |
451 | container_mem_unlock(c); | |
72d0e1cb SG |
452 | return ret; |
453 | } | |
454 | ||
540f932a | 455 | static bool lxcapi_want_daemonize(struct lxc_container *c, bool state) |
72d0e1cb | 456 | { |
497a2995 | 457 | if (!c || !c->lxc_conf) |
540f932a | 458 | return false; |
f02abefe | 459 | if (container_mem_lock(c)) { |
3bc449ed | 460 | ERROR("Error getting mem lock"); |
540f932a | 461 | return false; |
3bc449ed | 462 | } |
540f932a | 463 | c->daemonize = state; |
83758ed0 | 464 | /* daemonize implies close_all_fds so set it */ |
540f932a SG |
465 | if (state == 1) |
466 | c->lxc_conf->close_all_fds = 1; | |
3bc449ed | 467 | container_mem_unlock(c); |
540f932a | 468 | return true; |
72d0e1cb SG |
469 | } |
470 | ||
540f932a | 471 | static bool lxcapi_want_close_all_fds(struct lxc_container *c, bool state) |
130a1888 ÇO |
472 | { |
473 | if (!c || !c->lxc_conf) | |
49badbbe | 474 | return false; |
130a1888 ÇO |
475 | if (container_mem_lock(c)) { |
476 | ERROR("Error getting mem lock"); | |
49badbbe | 477 | return false; |
130a1888 | 478 | } |
540f932a | 479 | c->lxc_conf->close_all_fds = state; |
130a1888 | 480 | container_mem_unlock(c); |
49badbbe | 481 | return true; |
130a1888 ÇO |
482 | } |
483 | ||
12a50cc6 | 484 | static bool lxcapi_wait(struct lxc_container *c, const char *state, int timeout) |
7a44c8b4 SG |
485 | { |
486 | int ret; | |
487 | ||
488 | if (!c) | |
489 | return false; | |
490 | ||
67e571de | 491 | ret = lxc_wait(c->name, state, timeout, c->config_path); |
7a44c8b4 SG |
492 | return ret == 0; |
493 | } | |
494 | ||
495 | ||
03f064ff | 496 | static bool wait_on_daemonized_start(struct lxc_container *c, int pid) |
7a44c8b4 SG |
497 | { |
498 | /* we'll probably want to make this timeout configurable? */ | |
697fa639 | 499 | int timeout = 5, ret, status; |
7a44c8b4 | 500 | |
697fa639 SH |
501 | /* |
502 | * our child is going to fork again, then exit. reap the | |
503 | * child | |
504 | */ | |
03f064ff | 505 | ret = waitpid(pid, &status, 0); |
697fa639 SH |
506 | if (ret == -1 || !WIFEXITED(status) || WEXITSTATUS(status) != 0) |
507 | DEBUG("failed waiting for first dual-fork child"); | |
7a44c8b4 SG |
508 | return lxcapi_wait(c, "RUNNING", timeout); |
509 | } | |
510 | ||
2d834aa8 SH |
511 | static bool am_single_threaded(void) |
512 | { | |
513 | struct dirent dirent, *direntp; | |
514 | DIR *dir; | |
515 | int count=0; | |
516 | ||
2d834aa8 | 517 | dir = opendir("/proc/self/task"); |
2d834aa8 SH |
518 | if (!dir) { |
519 | INFO("failed to open /proc/self/task"); | |
520 | return false; | |
521 | } | |
522 | ||
523 | while (!readdir_r(dir, &dirent, &direntp)) { | |
524 | if (!direntp) | |
525 | break; | |
526 | ||
527 | if (!strcmp(direntp->d_name, ".")) | |
528 | continue; | |
529 | ||
530 | if (!strcmp(direntp->d_name, "..")) | |
531 | continue; | |
532 | if (++count > 1) | |
533 | break; | |
534 | } | |
2d834aa8 | 535 | closedir(dir); |
2d834aa8 SH |
536 | return count == 1; |
537 | } | |
538 | ||
72d0e1cb SG |
539 | /* |
540 | * I can't decide if it'd be more convenient for callers if we accept '...', | |
541 | * or a null-terminated array (i.e. execl vs execv) | |
542 | */ | |
12a50cc6 | 543 | static bool lxcapi_start(struct lxc_container *c, int useinit, char * const argv[]) |
72d0e1cb SG |
544 | { |
545 | int ret; | |
546 | struct lxc_conf *conf; | |
540f932a | 547 | bool daemonize = false; |
6eaac303 | 548 | FILE *pid_fp = NULL; |
72d0e1cb SG |
549 | char *default_args[] = { |
550 | "/sbin/init", | |
13aad0ae | 551 | NULL, |
72d0e1cb SG |
552 | }; |
553 | ||
554 | /* container exists */ | |
555 | if (!c) | |
556 | return false; | |
557 | /* container has been setup */ | |
558 | if (!c->lxc_conf) | |
559 | return false; | |
560 | ||
3e625e2d SH |
561 | if ((ret = ongoing_create(c)) < 0) { |
562 | ERROR("Error checking for incomplete creation"); | |
563 | return false; | |
564 | } | |
565 | if (ret == 2) { | |
566 | ERROR("Error: %s creation was not completed", c->name); | |
567 | c->destroy(c); | |
568 | return false; | |
569 | } else if (ret == 1) { | |
570 | ERROR("Error: creation of %s is ongoing", c->name); | |
571 | return false; | |
572 | } | |
573 | ||
72d0e1cb SG |
574 | /* is this app meant to be run through lxcinit, as in lxc-execute? */ |
575 | if (useinit && !argv) | |
576 | return false; | |
577 | ||
5cee8c50 | 578 | if (container_mem_lock(c)) |
72d0e1cb SG |
579 | return false; |
580 | conf = c->lxc_conf; | |
581 | daemonize = c->daemonize; | |
5cee8c50 | 582 | container_mem_unlock(c); |
72d0e1cb SG |
583 | |
584 | if (useinit) { | |
13f5be62 | 585 | ret = lxc_execute(c->name, argv, 1, conf, c->config_path); |
72d0e1cb SG |
586 | return ret == 0 ? true : false; |
587 | } | |
588 | ||
589 | if (!argv) | |
590 | argv = default_args; | |
591 | ||
592 | /* | |
593 | * say, I'm not sure - what locks do we want here? Any? | |
594 | * Is liblxc's locking enough here to protect the on disk | |
595 | * container? We don't want to exclude things like lxc_info | |
596 | * while container is running... | |
597 | */ | |
598 | if (daemonize) { | |
e51d4895 | 599 | lxc_monitord_spawn(c->config_path); |
71454076 | 600 | |
72d0e1cb | 601 | pid_t pid = fork(); |
844f7a38 | 602 | if (pid < 0) |
72d0e1cb | 603 | return false; |
6eaac303 QH |
604 | |
605 | if (pid != 0) { | |
606 | /* Set to NULL because we don't want father unlink | |
607 | * the PID file, child will do the free and unlink. | |
608 | */ | |
609 | c->pidfile = NULL; | |
03f064ff | 610 | return wait_on_daemonized_start(c, pid); |
6eaac303 | 611 | } |
025ed0f3 | 612 | |
697fa639 SH |
613 | /* second fork to be reparented by init */ |
614 | pid = fork(); | |
615 | if (pid < 0) { | |
616 | SYSERROR("Error doing dual-fork"); | |
617 | return false; | |
618 | } | |
619 | if (pid != 0) | |
620 | exit(0); | |
72d0e1cb | 621 | /* like daemon(), chdir to / and redirect 0,1,2 to /dev/null */ |
c278cef2 SH |
622 | if (chdir("/")) { |
623 | SYSERROR("Error chdir()ing to /."); | |
624 | return false; | |
625 | } | |
72d0e1cb SG |
626 | close(0); |
627 | close(1); | |
628 | close(2); | |
eddaaafd | 629 | open("/dev/zero", O_RDONLY); |
72d0e1cb SG |
630 | open("/dev/null", O_RDWR); |
631 | open("/dev/null", O_RDWR); | |
632 | setsid(); | |
2d834aa8 SH |
633 | } else { |
634 | if (!am_single_threaded()) { | |
635 | ERROR("Cannot start non-daemonized container when threaded"); | |
636 | return false; | |
637 | } | |
72d0e1cb SG |
638 | } |
639 | ||
6eaac303 QH |
640 | /* We need to write PID file after daeminize, so we always |
641 | * write the right PID. | |
642 | */ | |
643 | if (c->pidfile) { | |
644 | pid_fp = fopen(c->pidfile, "w"); | |
645 | if (pid_fp == NULL) { | |
646 | SYSERROR("Failed to create pidfile '%s' for '%s'", | |
647 | c->pidfile, c->name); | |
648 | return false; | |
649 | } | |
650 | ||
651 | if (fprintf(pid_fp, "%d\n", getpid()) < 0) { | |
652 | SYSERROR("Failed to write '%s'", c->pidfile); | |
653 | fclose(pid_fp); | |
654 | pid_fp = NULL; | |
655 | return false; | |
656 | } | |
657 | ||
658 | fclose(pid_fp); | |
659 | pid_fp = NULL; | |
660 | } | |
661 | ||
72d0e1cb SG |
662 | reboot: |
663 | conf->reboot = 0; | |
13f5be62 | 664 | ret = lxc_start(c->name, argv, conf, c->config_path); |
72d0e1cb SG |
665 | |
666 | if (conf->reboot) { | |
667 | INFO("container requested reboot"); | |
668 | conf->reboot = 0; | |
72d0e1cb SG |
669 | goto reboot; |
670 | } | |
671 | ||
487d8008 QH |
672 | if (c->pidfile) { |
673 | unlink(c->pidfile); | |
674 | free(c->pidfile); | |
675 | c->pidfile = NULL; | |
676 | } | |
677 | ||
844f7a38 | 678 | if (daemonize) |
05e5d7dc | 679 | exit (ret == 0 ? true : false); |
844f7a38 | 680 | else |
05e5d7dc | 681 | return (ret == 0 ? true : false); |
72d0e1cb SG |
682 | } |
683 | ||
684 | /* | |
685 | * note there MUST be an ending NULL | |
686 | */ | |
687 | static bool lxcapi_startl(struct lxc_container *c, int useinit, ...) | |
688 | { | |
689 | va_list ap; | |
a0e93eeb | 690 | char **inargs = NULL; |
72d0e1cb SG |
691 | bool bret = false; |
692 | ||
693 | /* container exists */ | |
694 | if (!c) | |
695 | return false; | |
696 | ||
72d0e1cb | 697 | va_start(ap, useinit); |
a0e93eeb | 698 | inargs = lxc_va_arg_list_to_argv(ap, 0, 1); |
72d0e1cb SG |
699 | va_end(ap); |
700 | ||
a0e93eeb CS |
701 | if (!inargs) { |
702 | ERROR("Memory allocation error."); | |
703 | goto out; | |
72d0e1cb SG |
704 | } |
705 | ||
a0e93eeb CS |
706 | /* pass NULL if no arguments were supplied */ |
707 | bret = lxcapi_start(c, useinit, *inargs ? inargs : NULL); | |
72d0e1cb SG |
708 | |
709 | out: | |
710 | if (inargs) { | |
4e03ae57 DE |
711 | char **arg; |
712 | for (arg = inargs; *arg; arg++) | |
713 | free(*arg); | |
72d0e1cb SG |
714 | free(inargs); |
715 | } | |
716 | ||
717 | return bret; | |
718 | } | |
719 | ||
720 | static bool lxcapi_stop(struct lxc_container *c) | |
721 | { | |
722 | int ret; | |
723 | ||
724 | if (!c) | |
725 | return false; | |
726 | ||
ef6e34ee | 727 | ret = lxc_cmd_stop(c->name, c->config_path); |
72d0e1cb SG |
728 | |
729 | return ret == 0; | |
72d0e1cb SG |
730 | } |
731 | ||
72d0e1cb SG |
732 | /* |
733 | * create the standard expected container dir | |
734 | */ | |
735 | static bool create_container_dir(struct lxc_container *c) | |
736 | { | |
737 | char *s; | |
738 | int len, ret; | |
739 | ||
2a59a681 | 740 | len = strlen(c->config_path) + strlen(c->name) + 2; |
72d0e1cb SG |
741 | s = malloc(len); |
742 | if (!s) | |
743 | return false; | |
2a59a681 | 744 | ret = snprintf(s, len, "%s/%s", c->config_path, c->name); |
72d0e1cb SG |
745 | if (ret < 0 || ret >= len) { |
746 | free(s); | |
747 | return false; | |
748 | } | |
749 | ret = mkdir(s, 0755); | |
750 | if (ret) { | |
751 | if (errno == EEXIST) | |
752 | ret = 0; | |
753 | else | |
959aee9c | 754 | SYSERROR("failed to create container path for %s", c->name); |
72d0e1cb SG |
755 | } |
756 | free(s); | |
757 | return ret == 0; | |
758 | } | |
759 | ||
1897e3bc SH |
760 | static const char *lxcapi_get_config_path(struct lxc_container *c); |
761 | static bool lxcapi_set_config_item(struct lxc_container *c, const char *key, const char *v); | |
762 | ||
72d0e1cb | 763 | /* |
1897e3bc SH |
764 | * do_bdev_create: thin wrapper around bdev_create(). Like bdev_create(), |
765 | * it returns a mounted bdev on success, NULL on error. | |
72d0e1cb | 766 | */ |
1897e3bc SH |
767 | static struct bdev *do_bdev_create(struct lxc_container *c, const char *type, |
768 | struct bdev_specs *specs) | |
769 | { | |
770 | char *dest; | |
1897e3bc SH |
771 | size_t len; |
772 | struct bdev *bdev; | |
773 | int ret; | |
774 | ||
cd219ae6 SY |
775 | /* rootfs.path or lxcpath/lxcname/rootfs */ |
776 | if (c->lxc_conf->rootfs.path && access(c->lxc_conf->rootfs.path, F_OK) == 0) { | |
cf465fe4 SH |
777 | const char *rpath = c->lxc_conf->rootfs.path; |
778 | len = strlen(rpath) + 1; | |
cd219ae6 | 779 | dest = alloca(len); |
cf465fe4 | 780 | ret = snprintf(dest, len, "%s", rpath); |
cd219ae6 | 781 | } else { |
cf465fe4 | 782 | const char *lxcpath = lxcapi_get_config_path(c); |
cd219ae6 SY |
783 | len = strlen(c->name) + strlen(lxcpath) + 9; |
784 | dest = alloca(len); | |
785 | ret = snprintf(dest, len, "%s/%s/rootfs", lxcpath, c->name); | |
786 | } | |
1897e3bc SH |
787 | if (ret < 0 || ret >= len) |
788 | return NULL; | |
789 | ||
790 | bdev = bdev_create(dest, type, c->name, specs); | |
d44e88c2 | 791 | if (!bdev) { |
959aee9c | 792 | ERROR("Failed to create backing store type %s", type); |
1897e3bc | 793 | return NULL; |
d44e88c2 SH |
794 | } |
795 | ||
1897e3bc | 796 | lxcapi_set_config_item(c, "lxc.rootfs", bdev->src); |
cf3ef16d SH |
797 | |
798 | /* if we are not root, chown the rootfs dir to root in the | |
799 | * target uidmap */ | |
800 | ||
0e6e3a41 | 801 | if (geteuid() != 0 || (c->lxc_conf && !lxc_list_empty(&c->lxc_conf->id_map))) { |
c4d10a05 | 802 | if (chown_mapped_root(bdev->dest, c->lxc_conf) < 0) { |
959aee9c | 803 | ERROR("Error chowning %s to container root", bdev->dest); |
cf3ef16d SH |
804 | bdev_put(bdev); |
805 | return NULL; | |
806 | } | |
807 | } | |
808 | ||
1897e3bc SH |
809 | return bdev; |
810 | } | |
811 | ||
cbee8106 SH |
812 | /* |
813 | * Given the '-t' template option to lxc-create, figure out what to | |
814 | * do. If the template is a full executable path, use that. If it | |
85db5535 DE |
815 | * is something like 'sshd', then return $templatepath/lxc-sshd. |
816 | * On success return the template, on error return NULL. | |
cbee8106 | 817 | */ |
85db5535 | 818 | static char *get_template_path(const char *t) |
cbee8106 SH |
819 | { |
820 | int ret, len; | |
821 | char *tpath; | |
822 | ||
cbee8106 SH |
823 | if (t[0] == '/' && access(t, X_OK) == 0) { |
824 | tpath = strdup(t); | |
cbee8106 SH |
825 | return tpath; |
826 | } | |
827 | ||
828 | len = strlen(LXCTEMPLATEDIR) + strlen(t) + strlen("/lxc-") + 1; | |
829 | tpath = malloc(len); | |
830 | if (!tpath) | |
85db5535 | 831 | return NULL; |
cbee8106 SH |
832 | ret = snprintf(tpath, len, "%s/lxc-%s", LXCTEMPLATEDIR, t); |
833 | if (ret < 0 || ret >= len) { | |
834 | free(tpath); | |
85db5535 | 835 | return NULL; |
cbee8106 SH |
836 | } |
837 | if (access(tpath, X_OK) < 0) { | |
959aee9c | 838 | SYSERROR("bad template: %s", t); |
cbee8106 | 839 | free(tpath); |
85db5535 | 840 | return NULL; |
cbee8106 SH |
841 | } |
842 | ||
843 | return tpath; | |
844 | } | |
845 | ||
96b3cb40 | 846 | static char *lxcbasename(char *path) |
72d0e1cb | 847 | { |
96b3cb40 SH |
848 | char *p = path + strlen(path) - 1; |
849 | while (*p != '/' && p > path) | |
850 | p--; | |
851 | return p; | |
852 | } | |
72d0e1cb | 853 | |
dc23c1c8 | 854 | static bool create_run_template(struct lxc_container *c, char *tpath, bool quiet, |
96b3cb40 SH |
855 | char *const argv[]) |
856 | { | |
857 | pid_t pid; | |
72d0e1cb | 858 | |
72d0e1cb | 859 | if (!tpath) |
96b3cb40 | 860 | return true; |
72d0e1cb SG |
861 | |
862 | pid = fork(); | |
863 | if (pid < 0) { | |
959aee9c | 864 | SYSERROR("failed to fork task for container creation template"); |
96b3cb40 | 865 | return false; |
72d0e1cb SG |
866 | } |
867 | ||
868 | if (pid == 0) { // child | |
1897e3bc SH |
869 | char *patharg, *namearg, *rootfsarg, *src; |
870 | struct bdev *bdev = NULL; | |
72d0e1cb | 871 | int i; |
96b3cb40 SH |
872 | int ret, len, nargs = 0; |
873 | char **newargv; | |
cf3ef16d | 874 | struct lxc_conf *conf = c->lxc_conf; |
72d0e1cb | 875 | |
dc23c1c8 SH |
876 | if (quiet) { |
877 | close(0); | |
878 | close(1); | |
879 | close(2); | |
880 | open("/dev/zero", O_RDONLY); | |
881 | open("/dev/null", O_RDWR); | |
882 | open("/dev/null", O_RDWR); | |
883 | } | |
1897e3bc SH |
884 | |
885 | src = c->lxc_conf->rootfs.path; | |
886 | /* | |
1f92162d | 887 | * for an overlay create, what the user wants is the template to fill |
1897e3bc SH |
888 | * in what will become the readonly lower layer. So don't mount for |
889 | * the template | |
890 | */ | |
1f92162d SG |
891 | if (strncmp(src, "overlayfs:", 10) == 0) |
892 | src = overlay_getlower(src+10); | |
893 | if (strncmp(src, "aufs:", 5) == 0) | |
894 | src = overlay_getlower(src+5); | |
895 | ||
76a26f55 | 896 | bdev = bdev_init(c->lxc_conf, src, c->lxc_conf->rootfs.mount, NULL); |
1897e3bc SH |
897 | if (!bdev) { |
898 | ERROR("Error opening rootfs"); | |
899 | exit(1); | |
900 | } | |
901 | ||
4de2791f | 902 | if (geteuid() == 0) { |
cf3ef16d SH |
903 | if (unshare(CLONE_NEWNS) < 0) { |
904 | ERROR("error unsharing mounts"); | |
905 | exit(1); | |
906 | } | |
4de2791f | 907 | if (detect_shared_rootfs()) { |
c597baa8 | 908 | if (mount(NULL, "/", NULL, MS_SLAVE|MS_REC, NULL)) { |
4de2791f SH |
909 | SYSERROR("Failed to make / rslave to run template"); |
910 | ERROR("Continuing..."); | |
911 | } | |
912 | } | |
913 | } | |
2659c7cb | 914 | if (strcmp(bdev->type, "dir") && strcmp(bdev->type, "btrfs")) { |
4de2791f | 915 | if (geteuid() != 0) { |
2659c7cb | 916 | ERROR("non-root users can only create btrfs and directory-backed containers"); |
4de2791f SH |
917 | exit(1); |
918 | } | |
cf3ef16d SH |
919 | if (bdev->ops->mount(bdev) < 0) { |
920 | ERROR("Error mounting rootfs"); | |
921 | exit(1); | |
922 | } | |
923 | } else { // TODO come up with a better way here! | |
924 | if (bdev->dest) | |
925 | free(bdev->dest); | |
926 | bdev->dest = strdup(bdev->src); | |
1897e3bc SH |
927 | } |
928 | ||
72d0e1cb SG |
929 | /* |
930 | * create our new array, pre-pend the template name and | |
931 | * base args | |
932 | */ | |
933 | if (argv) | |
1897e3bc | 934 | for (nargs = 0; argv[nargs]; nargs++) ; |
6849cb5b | 935 | nargs += 4; // template, path, rootfs and name args |
cf3ef16d | 936 | |
72d0e1cb SG |
937 | newargv = malloc(nargs * sizeof(*newargv)); |
938 | if (!newargv) | |
939 | exit(1); | |
96b3cb40 | 940 | newargv[0] = lxcbasename(tpath); |
72d0e1cb | 941 | |
2a59a681 | 942 | len = strlen(c->config_path) + strlen(c->name) + strlen("--path=") + 2; |
72d0e1cb SG |
943 | patharg = malloc(len); |
944 | if (!patharg) | |
945 | exit(1); | |
2a59a681 | 946 | ret = snprintf(patharg, len, "--path=%s/%s", c->config_path, c->name); |
72d0e1cb SG |
947 | if (ret < 0 || ret >= len) |
948 | exit(1); | |
949 | newargv[1] = patharg; | |
950 | len = strlen("--name=") + strlen(c->name) + 1; | |
951 | namearg = malloc(len); | |
952 | if (!namearg) | |
953 | exit(1); | |
954 | ret = snprintf(namearg, len, "--name=%s", c->name); | |
955 | if (ret < 0 || ret >= len) | |
956 | exit(1); | |
957 | newargv[2] = namearg; | |
958 | ||
1897e3bc SH |
959 | len = strlen("--rootfs=") + 1 + strlen(bdev->dest); |
960 | rootfsarg = malloc(len); | |
961 | if (!rootfsarg) | |
962 | exit(1); | |
963 | ret = snprintf(rootfsarg, len, "--rootfs=%s", bdev->dest); | |
964 | if (ret < 0 || ret >= len) | |
965 | exit(1); | |
966 | newargv[3] = rootfsarg; | |
967 | ||
72d0e1cb SG |
968 | /* add passed-in args */ |
969 | if (argv) | |
1897e3bc SH |
970 | for (i = 4; i < nargs; i++) |
971 | newargv[i] = argv[i-4]; | |
72d0e1cb SG |
972 | |
973 | /* add trailing NULL */ | |
974 | nargs++; | |
975 | newargv = realloc(newargv, nargs * sizeof(*newargv)); | |
976 | if (!newargv) | |
977 | exit(1); | |
978 | newargv[nargs - 1] = NULL; | |
979 | ||
cf3ef16d SH |
980 | /* |
981 | * If we're running the template in a mapped userns, then | |
982 | * we prepend the template command with: | |
983 | * lxc-usernsexec <-m map1> ... <-m mapn> -- | |
57d116ab SH |
984 | * and we append "--mapped-uid x", where x is the mapped uid |
985 | * for our geteuid() | |
cf3ef16d | 986 | */ |
0e6e3a41 | 987 | if (!lxc_list_empty(&conf->id_map)) { |
cf3ef16d | 988 | int n2args = 1; |
57d116ab | 989 | char txtuid[20]; |
2133f58c | 990 | char txtgid[20]; |
cf3ef16d SH |
991 | char **n2 = malloc(n2args * sizeof(*n2)); |
992 | struct lxc_list *it; | |
993 | struct id_map *map; | |
994 | ||
57d116ab SH |
995 | if (!n2) { |
996 | SYSERROR("out of memory"); | |
997 | exit(1); | |
998 | } | |
cf3ef16d SH |
999 | newargv[0] = tpath; |
1000 | tpath = "lxc-usernsexec"; | |
1001 | n2[0] = "lxc-usernsexec"; | |
1002 | lxc_list_for_each(it, &conf->id_map) { | |
1003 | map = it->elem; | |
1004 | n2args += 2; | |
57d116ab | 1005 | n2 = realloc(n2, n2args * sizeof(char *)); |
cf3ef16d SH |
1006 | if (!n2) |
1007 | exit(1); | |
1008 | n2[n2args-2] = "-m"; | |
1009 | n2[n2args-1] = malloc(200); | |
1010 | if (!n2[n2args-1]) | |
1011 | exit(1); | |
1012 | ret = snprintf(n2[n2args-1], 200, "%c:%lu:%lu:%lu", | |
1013 | map->idtype == ID_TYPE_UID ? 'u' : 'g', | |
1014 | map->nsid, map->hostid, map->range); | |
1015 | if (ret < 0 || ret >= 200) | |
1016 | exit(1); | |
1017 | } | |
2133f58c | 1018 | int hostid_mapped = mapped_hostid(geteuid(), conf, ID_TYPE_UID); |
6849cb5b | 1019 | int extraargs = hostid_mapped >= 0 ? 1 : 3; |
57d116ab | 1020 | n2 = realloc(n2, (nargs + n2args + extraargs) * sizeof(char *)); |
cf3ef16d SH |
1021 | if (!n2) |
1022 | exit(1); | |
57d116ab | 1023 | if (hostid_mapped < 0) { |
2133f58c | 1024 | hostid_mapped = find_unmapped_nsuid(conf, ID_TYPE_UID); |
cf3ef16d | 1025 | n2[n2args++] = "-m"; |
57d116ab | 1026 | if (hostid_mapped < 0) { |
cf3ef16d SH |
1027 | ERROR("Could not find free uid to map"); |
1028 | exit(1); | |
1029 | } | |
1030 | n2[n2args++] = malloc(200); | |
1031 | if (!n2[n2args-1]) { | |
1032 | SYSERROR("out of memory"); | |
1033 | exit(1); | |
1034 | } | |
1035 | ret = snprintf(n2[n2args-1], 200, "u:%d:%d:1", | |
57d116ab | 1036 | hostid_mapped, geteuid()); |
cf3ef16d SH |
1037 | if (ret < 0 || ret >= 200) { |
1038 | ERROR("string too long"); | |
1039 | exit(1); | |
1040 | } | |
1041 | } | |
2133f58c SH |
1042 | int hostgid_mapped = mapped_hostid(getegid(), conf, ID_TYPE_GID); |
1043 | extraargs = hostgid_mapped >= 0 ? 1 : 3; | |
1044 | n2 = realloc(n2, (nargs + n2args + extraargs) * sizeof(char *)); | |
1045 | if (!n2) | |
1046 | exit(1); | |
1047 | if (hostgid_mapped < 0) { | |
1048 | hostgid_mapped = find_unmapped_nsuid(conf, ID_TYPE_GID); | |
1049 | n2[n2args++] = "-m"; | |
1050 | if (hostgid_mapped < 0) { | |
1051 | ERROR("Could not find free uid to map"); | |
1052 | exit(1); | |
1053 | } | |
1054 | n2[n2args++] = malloc(200); | |
1055 | if (!n2[n2args-1]) { | |
1056 | SYSERROR("out of memory"); | |
1057 | exit(1); | |
1058 | } | |
1059 | ret = snprintf(n2[n2args-1], 200, "g:%d:%d:1", | |
1060 | hostgid_mapped, getegid()); | |
1061 | if (ret < 0 || ret >= 200) { | |
1062 | ERROR("string too long"); | |
1063 | exit(1); | |
1064 | } | |
1065 | } | |
cf3ef16d SH |
1066 | n2[n2args++] = "--"; |
1067 | for (i = 0; i < nargs; i++) | |
1068 | n2[i + n2args] = newargv[i]; | |
57d116ab SH |
1069 | n2args += nargs; |
1070 | // Finally add "--mapped-uid $uid" to tell template what to chown | |
1071 | // cached images to | |
2133f58c | 1072 | n2args += 4; |
57d116ab SH |
1073 | n2 = realloc(n2, n2args * sizeof(char *)); |
1074 | if (!n2) { | |
1075 | SYSERROR("out of memory"); | |
1076 | exit(1); | |
1077 | } | |
1078 | // note n2[n2args-1] is NULL | |
2133f58c | 1079 | n2[n2args-5] = "--mapped-uid"; |
57d116ab | 1080 | snprintf(txtuid, 20, "%d", hostid_mapped); |
2133f58c SH |
1081 | n2[n2args-4] = txtuid; |
1082 | n2[n2args-3] = "--mapped-gid"; | |
1083 | snprintf(txtgid, 20, "%d", hostgid_mapped); | |
1084 | n2[n2args-2] = txtgid; | |
57d116ab | 1085 | n2[n2args-1] = NULL; |
cf3ef16d SH |
1086 | free(newargv); |
1087 | newargv = n2; | |
1088 | } | |
72d0e1cb | 1089 | /* execute */ |
cf3ef16d | 1090 | execvp(tpath, newargv); |
72d0e1cb SG |
1091 | SYSERROR("failed to execute template %s", tpath); |
1092 | exit(1); | |
1093 | } | |
1094 | ||
9be53773 | 1095 | if (wait_for_pid(pid) != 0) { |
959aee9c | 1096 | ERROR("container creation template for %s failed", c->name); |
96b3cb40 SH |
1097 | return false; |
1098 | } | |
1099 | ||
1100 | return true; | |
1101 | } | |
1102 | ||
74a3920a | 1103 | static bool prepend_lxc_header(char *path, const char *t, char *const argv[]) |
3ce74686 | 1104 | { |
1fd9bd50 | 1105 | long flen; |
b4569e93 | 1106 | char *contents; |
3ce74686 | 1107 | FILE *f; |
025ed0f3 | 1108 | int ret = -1; |
52026772 | 1109 | #if HAVE_LIBGNUTLS |
025ed0f3 | 1110 | int i; |
3ce74686 | 1111 | unsigned char md_value[SHA_DIGEST_LENGTH]; |
b4569e93 | 1112 | char *tpath; |
52026772 | 1113 | #endif |
3ce74686 | 1114 | |
025ed0f3 | 1115 | f = fopen(path, "r"); |
025ed0f3 | 1116 | if (f == NULL) |
3ce74686 | 1117 | return false; |
025ed0f3 SH |
1118 | |
1119 | if (fseek(f, 0, SEEK_END) < 0) | |
1120 | goto out_error; | |
1121 | if ((flen = ftell(f)) < 0) | |
1122 | goto out_error; | |
1123 | if (fseek(f, 0, SEEK_SET) < 0) | |
1124 | goto out_error; | |
1125 | if ((contents = malloc(flen + 1)) == NULL) | |
1126 | goto out_error; | |
1127 | if (fread(contents, 1, flen, f) != flen) | |
1128 | goto out_free_contents; | |
1129 | ||
3ce74686 | 1130 | contents[flen] = '\0'; |
025ed0f3 | 1131 | ret = fclose(f); |
025ed0f3 SH |
1132 | f = NULL; |
1133 | if (ret < 0) | |
1134 | goto out_free_contents; | |
3ce74686 | 1135 | |
b4569e93 | 1136 | #if HAVE_LIBGNUTLS |
01efd4d3 | 1137 | tpath = get_template_path(t); |
85db5535 | 1138 | if (!tpath) { |
959aee9c | 1139 | ERROR("bad template: %s", t); |
025ed0f3 | 1140 | goto out_free_contents; |
3ce74686 SH |
1141 | } |
1142 | ||
85db5535 DE |
1143 | ret = sha1sum_file(tpath, md_value); |
1144 | if (ret < 0) { | |
1145 | ERROR("Error getting sha1sum of %s", tpath); | |
3ce74686 | 1146 | free(tpath); |
85db5535 | 1147 | goto out_free_contents; |
3ce74686 | 1148 | } |
85db5535 | 1149 | free(tpath); |
3ce74686 SH |
1150 | #endif |
1151 | ||
025ed0f3 | 1152 | f = fopen(path, "w"); |
025ed0f3 | 1153 | if (f == NULL) { |
3ce74686 SH |
1154 | SYSERROR("reopening config for writing"); |
1155 | free(contents); | |
1156 | return false; | |
1157 | } | |
1158 | fprintf(f, "# Template used to create this container: %s\n", t); | |
1159 | if (argv) { | |
1160 | fprintf(f, "# Parameters passed to the template:"); | |
1161 | while (*argv) { | |
1162 | fprintf(f, " %s", *argv); | |
1163 | argv++; | |
1164 | } | |
1165 | fprintf(f, "\n"); | |
1166 | } | |
1167 | #if HAVE_LIBGNUTLS | |
56698177 SH |
1168 | fprintf(f, "# Template script checksum (SHA-1): "); |
1169 | for (i=0; i<SHA_DIGEST_LENGTH; i++) | |
1170 | fprintf(f, "%02x", md_value[i]); | |
1171 | fprintf(f, "\n"); | |
3ce74686 | 1172 | #endif |
f2a95ee1 | 1173 | fprintf(f, "# For additional config options, please look at lxc.conf(5)\n"); |
3ce74686 SH |
1174 | if (fwrite(contents, 1, flen, f) != flen) { |
1175 | SYSERROR("Writing original contents"); | |
1176 | free(contents); | |
1177 | fclose(f); | |
1178 | return false; | |
1179 | } | |
025ed0f3 SH |
1180 | ret = 0; |
1181 | out_free_contents: | |
3ce74686 | 1182 | free(contents); |
025ed0f3 SH |
1183 | out_error: |
1184 | if (f) { | |
1185 | int newret; | |
025ed0f3 | 1186 | newret = fclose(f); |
025ed0f3 SH |
1187 | if (ret == 0) |
1188 | ret = newret; | |
1189 | } | |
1190 | if (ret < 0) { | |
1191 | SYSERROR("Error prepending header"); | |
3ce74686 SH |
1192 | return false; |
1193 | } | |
1194 | return true; | |
1195 | } | |
1196 | ||
4df7f012 SH |
1197 | static void lxcapi_clear_config(struct lxc_container *c) |
1198 | { | |
1199 | if (c && c->lxc_conf) { | |
1200 | lxc_conf_free(c->lxc_conf); | |
1201 | c->lxc_conf = NULL; | |
1202 | } | |
1203 | } | |
1204 | ||
96b3cb40 SH |
1205 | static bool lxcapi_destroy(struct lxc_container *c); |
1206 | /* | |
1207 | * lxcapi_create: | |
1208 | * create a container with the given parameters. | |
1209 | * @c: container to be created. It has the lxcpath, name, and a starting | |
1210 | * configuration already set | |
1211 | * @t: the template to execute to instantiate the root filesystem and | |
1212 | * adjust the configuration. | |
1213 | * @bdevtype: backing store type to use. If NULL, dir will be used. | |
1214 | * @specs: additional parameters for the backing store, i.e. LVM vg to | |
1215 | * use. | |
1216 | * | |
1217 | * @argv: the arguments to pass to the template, terminated by NULL. If no | |
1218 | * arguments, you can just pass NULL. | |
1219 | */ | |
1220 | static bool lxcapi_create(struct lxc_container *c, const char *t, | |
dc23c1c8 | 1221 | const char *bdevtype, struct bdev_specs *specs, int flags, |
96b3cb40 SH |
1222 | char *const argv[]) |
1223 | { | |
a69aad27 | 1224 | bool ret = false; |
96b3cb40 | 1225 | pid_t pid; |
85db5535 | 1226 | char *tpath = NULL; |
cbee8106 | 1227 | int partial_fd; |
96b3cb40 SH |
1228 | |
1229 | if (!c) | |
1230 | return false; | |
1231 | ||
85db5535 DE |
1232 | if (t) { |
1233 | tpath = get_template_path(t); | |
1234 | if (!tpath) { | |
959aee9c | 1235 | ERROR("bad template: %s", t); |
85db5535 DE |
1236 | goto out; |
1237 | } | |
96b3cb40 SH |
1238 | } |
1239 | ||
cf465fe4 SH |
1240 | /* |
1241 | * If a template is passed in, and the rootfs already is defined in | |
1242 | * the container config and exists, then * caller is trying to create | |
1243 | * an existing container. Return an error, but do NOT delete the | |
1244 | * container. | |
1245 | */ | |
1246 | if (lxcapi_is_defined(c) && c->lxc_conf && c->lxc_conf->rootfs.path && | |
1247 | access(c->lxc_conf->rootfs.path, F_OK) == 0 && tpath) { | |
1248 | ERROR("Container %s:%s already exists", c->config_path, c->name); | |
6c6892b5 | 1249 | goto free_tpath; |
cf465fe4 SH |
1250 | } |
1251 | ||
6c6892b5 | 1252 | if (!c->lxc_conf) { |
dad87e3b | 1253 | if (!c->load_config(c, lxc_global_config_value("lxc.default_config"))) { |
959aee9c | 1254 | ERROR("Error loading default configuration file %s", lxc_global_config_value("lxc.default_config")); |
6c6892b5 DE |
1255 | goto free_tpath; |
1256 | } | |
96b3cb40 SH |
1257 | } |
1258 | ||
6c6892b5 DE |
1259 | if (!create_container_dir(c)) |
1260 | goto free_tpath; | |
1261 | ||
0590e82c SH |
1262 | /* |
1263 | * either template or rootfs.path should be set. | |
1264 | * if both template and rootfs.path are set, template is setup as rootfs.path. | |
1265 | * container is already created if we have a config and rootfs.path is accessible | |
1266 | */ | |
1267 | if (!c->lxc_conf->rootfs.path && !tpath) | |
1268 | /* no template passed in and rootfs does not exist: error */ | |
1269 | goto out; | |
1270 | if (c->lxc_conf->rootfs.path && access(c->lxc_conf->rootfs.path, F_OK) != 0) | |
1271 | /* rootfs passed into configuration, but does not exist: error */ | |
1272 | goto out; | |
1273 | if (lxcapi_is_defined(c) && c->lxc_conf->rootfs.path && !tpath) { | |
1274 | /* Rootfs already existed, user just wanted to save the | |
1275 | * loaded configuration */ | |
1276 | ret = true; | |
1277 | goto out; | |
a69aad27 | 1278 | } |
96b3cb40 SH |
1279 | |
1280 | /* Mark that this container is being created */ | |
1281 | if ((partial_fd = create_partial(c)) < 0) | |
1282 | goto out; | |
1283 | ||
1284 | /* no need to get disk lock bc we have the partial locked */ | |
1285 | ||
1286 | /* | |
1287 | * Create the backing store | |
1288 | * Note we can't do this in the same task as we use to execute the | |
1289 | * template because of the way zfs works. | |
1290 | * After you 'zfs create', zfs mounts the fs only in the initial | |
1291 | * namespace. | |
1292 | */ | |
1293 | pid = fork(); | |
1294 | if (pid < 0) { | |
959aee9c | 1295 | SYSERROR("failed to fork task for container creation template"); |
8eb5694b SH |
1296 | goto out_unlock; |
1297 | } | |
1298 | ||
96b3cb40 SH |
1299 | if (pid == 0) { // child |
1300 | struct bdev *bdev = NULL; | |
1301 | ||
1302 | if (!(bdev = do_bdev_create(c, bdevtype, specs))) { | |
1303 | ERROR("Error creating backing store type %s for %s", | |
1304 | bdevtype ? bdevtype : "(none)", c->name); | |
1305 | exit(1); | |
1306 | } | |
1307 | ||
1308 | /* save config file again to store the new rootfs location */ | |
1309 | if (!c->save_config(c, NULL)) { | |
959aee9c | 1310 | ERROR("failed to save starting configuration for %s", c->name); |
96b3cb40 SH |
1311 | // parent task won't see bdev in config so we delete it |
1312 | bdev->ops->umount(bdev); | |
1313 | bdev->ops->destroy(bdev); | |
1314 | exit(1); | |
1315 | } | |
1316 | exit(0); | |
1317 | } | |
1318 | if (wait_for_pid(pid) != 0) | |
a09295f8 | 1319 | goto out_unlock; |
96b3cb40 SH |
1320 | |
1321 | /* reload config to get the rootfs */ | |
a3b47c09 | 1322 | lxc_conf_free(c->lxc_conf); |
96b3cb40 SH |
1323 | c->lxc_conf = NULL; |
1324 | if (!load_config_locked(c, c->configfile)) | |
a09295f8 | 1325 | goto out_unlock; |
96b3cb40 | 1326 | |
dc23c1c8 | 1327 | if (!create_run_template(c, tpath, !!(flags & LXC_CREATE_QUIET), argv)) |
96b3cb40 SH |
1328 | goto out_unlock; |
1329 | ||
8eb5694b SH |
1330 | // now clear out the lxc_conf we have, reload from the created |
1331 | // container | |
4df7f012 | 1332 | lxcapi_clear_config(c); |
3ce74686 | 1333 | |
9d65a487 KY |
1334 | if (t) { |
1335 | if (!prepend_lxc_header(c->configfile, tpath, argv)) { | |
1336 | ERROR("Error prepending header to configuration file"); | |
1337 | goto out_unlock; | |
1338 | } | |
3ce74686 | 1339 | } |
a69aad27 | 1340 | ret = load_config_locked(c, c->configfile); |
72d0e1cb SG |
1341 | |
1342 | out_unlock: | |
3e625e2d SH |
1343 | if (partial_fd >= 0) |
1344 | remove_partial(c, partial_fd); | |
72d0e1cb | 1345 | out: |
a69aad27 | 1346 | if (!ret && c) |
1897e3bc | 1347 | lxcapi_destroy(c); |
6c6892b5 DE |
1348 | free_tpath: |
1349 | if (tpath) | |
1350 | free(tpath); | |
a69aad27 | 1351 | return ret; |
72d0e1cb SG |
1352 | } |
1353 | ||
3e625e2d SH |
1354 | static bool lxcapi_reboot(struct lxc_container *c) |
1355 | { | |
1356 | pid_t pid; | |
1357 | ||
1358 | if (!c) | |
1359 | return false; | |
1360 | if (!c->is_running(c)) | |
1361 | return false; | |
1362 | pid = c->init_pid(c); | |
1363 | if (pid <= 0) | |
1364 | return false; | |
1365 | if (kill(pid, SIGINT) < 0) | |
1366 | return false; | |
1367 | return true; | |
1368 | ||
1369 | } | |
1370 | ||
72d0e1cb SG |
1371 | static bool lxcapi_shutdown(struct lxc_container *c, int timeout) |
1372 | { | |
1373 | bool retv; | |
1374 | pid_t pid; | |
f0f1d8c0 | 1375 | int haltsignal = SIGPWR; |
72d0e1cb SG |
1376 | |
1377 | if (!c) | |
1378 | return false; | |
1379 | ||
72d0e1cb SG |
1380 | if (!c->is_running(c)) |
1381 | return true; | |
1382 | pid = c->init_pid(c); | |
1383 | if (pid <= 0) | |
1384 | return true; | |
b0227444 | 1385 | if (c->lxc_conf && c->lxc_conf->haltsignal) |
f0f1d8c0 DE |
1386 | haltsignal = c->lxc_conf->haltsignal; |
1387 | kill(pid, haltsignal); | |
72d0e1cb | 1388 | retv = c->wait(c, "STOPPED", timeout); |
72d0e1cb SG |
1389 | return retv; |
1390 | } | |
1391 | ||
1897e3bc | 1392 | static bool lxcapi_createl(struct lxc_container *c, const char *t, |
dc23c1c8 | 1393 | const char *bdevtype, struct bdev_specs *specs, int flags, ...) |
72d0e1cb SG |
1394 | { |
1395 | bool bret = false; | |
a0e93eeb | 1396 | char **args = NULL; |
72d0e1cb | 1397 | va_list ap; |
72d0e1cb SG |
1398 | |
1399 | if (!c) | |
1400 | return false; | |
1401 | ||
1402 | /* | |
1403 | * since we're going to wait for create to finish, I don't think we | |
1404 | * need to get a copy of the arguments. | |
1405 | */ | |
dc23c1c8 | 1406 | va_start(ap, flags); |
a0e93eeb | 1407 | args = lxc_va_arg_list_to_argv(ap, 0, 0); |
72d0e1cb | 1408 | va_end(ap); |
a0e93eeb CS |
1409 | if (!args) { |
1410 | ERROR("Memory allocation error."); | |
1411 | goto out; | |
1412 | } | |
72d0e1cb | 1413 | |
dc23c1c8 | 1414 | bret = c->create(c, t, bdevtype, specs, flags, args); |
72d0e1cb SG |
1415 | |
1416 | out: | |
a0e93eeb | 1417 | free(args); |
72d0e1cb SG |
1418 | return bret; |
1419 | } | |
1420 | ||
12a50cc6 | 1421 | static bool lxcapi_clear_config_item(struct lxc_container *c, const char *key) |
72d0e1cb SG |
1422 | { |
1423 | int ret; | |
1424 | ||
1425 | if (!c || !c->lxc_conf) | |
1426 | return false; | |
5cee8c50 | 1427 | if (container_mem_lock(c)) |
72d0e1cb | 1428 | return false; |
72d0e1cb | 1429 | ret = lxc_clear_config_item(c->lxc_conf, key); |
5cee8c50 | 1430 | container_mem_unlock(c); |
72d0e1cb SG |
1431 | return ret == 0; |
1432 | } | |
1433 | ||
ae22a220 ÇO |
1434 | static inline bool enter_to_ns(struct lxc_container *c) { |
1435 | int netns, userns, ret = 0, init_pid = 0;; | |
9c83a661 | 1436 | char new_netns_path[MAXPATHLEN]; |
ae22a220 | 1437 | char new_userns_path[MAXPATHLEN]; |
9c83a661 SG |
1438 | |
1439 | if (!c->is_running(c)) | |
1440 | goto out; | |
1441 | ||
ae22a220 ÇO |
1442 | init_pid = c->init_pid(c); |
1443 | ||
1444 | /* Switch to new userns */ | |
0e6e3a41 | 1445 | if ((geteuid() != 0 || (c->lxc_conf && !lxc_list_empty(&c->lxc_conf->id_map))) && access("/proc/self/ns/user", F_OK) == 0) { |
ae22a220 ÇO |
1446 | ret = snprintf(new_userns_path, MAXPATHLEN, "/proc/%d/ns/user", init_pid); |
1447 | if (ret < 0 || ret >= MAXPATHLEN) | |
1448 | goto out; | |
1449 | ||
1450 | userns = open(new_userns_path, O_RDONLY); | |
1451 | if (userns < 0) { | |
1452 | SYSERROR("failed to open %s", new_userns_path); | |
1453 | goto out; | |
1454 | } | |
1455 | ||
1456 | if (setns(userns, CLONE_NEWUSER)) { | |
1457 | SYSERROR("failed to setns for CLONE_NEWUSER"); | |
452c9141 | 1458 | close(userns); |
ae22a220 ÇO |
1459 | goto out; |
1460 | } | |
452c9141 | 1461 | close(userns); |
9c83a661 SG |
1462 | } |
1463 | ||
1464 | /* Switch to new netns */ | |
ae22a220 | 1465 | ret = snprintf(new_netns_path, MAXPATHLEN, "/proc/%d/ns/net", init_pid); |
9c83a661 SG |
1466 | if (ret < 0 || ret >= MAXPATHLEN) |
1467 | goto out; | |
1468 | ||
ae22a220 ÇO |
1469 | netns = open(new_netns_path, O_RDONLY); |
1470 | if (netns < 0) { | |
9c83a661 SG |
1471 | SYSERROR("failed to open %s", new_netns_path); |
1472 | goto out; | |
1473 | } | |
1474 | ||
ae22a220 ÇO |
1475 | if (setns(netns, CLONE_NEWNET)) { |
1476 | SYSERROR("failed to setns for CLONE_NEWNET"); | |
32f4b9c7 | 1477 | close(netns); |
9c83a661 SG |
1478 | goto out; |
1479 | } | |
32f4b9c7 | 1480 | close(netns); |
799f29ab ÇO |
1481 | return true; |
1482 | out: | |
799f29ab ÇO |
1483 | return false; |
1484 | } | |
1485 | ||
9c88ff1f ÇO |
1486 | // used by qsort and bsearch functions for comparing names |
1487 | static inline int string_cmp(char **first, char **second) | |
1488 | { | |
1489 | return strcmp(*first, *second); | |
1490 | } | |
1491 | ||
1492 | // used by qsort and bsearch functions for comparing container names | |
1493 | static inline int container_cmp(struct lxc_container **first, struct lxc_container **second) | |
1494 | { | |
1495 | return strcmp((*first)->name, (*second)->name); | |
1496 | } | |
1497 | ||
1498 | static bool add_to_array(char ***names, char *cname, int pos) | |
1499 | { | |
1500 | char **newnames = realloc(*names, (pos+1) * sizeof(char *)); | |
1501 | if (!newnames) { | |
1502 | ERROR("Out of memory"); | |
1503 | return false; | |
1504 | } | |
1505 | ||
1506 | *names = newnames; | |
1507 | newnames[pos] = strdup(cname); | |
1508 | if (!newnames[pos]) | |
1509 | return false; | |
1510 | ||
1511 | // sort the arrray as we will use binary search on it | |
1512 | qsort(newnames, pos + 1, sizeof(char *), (int (*)(const void *,const void *))string_cmp); | |
1513 | ||
1514 | return true; | |
1515 | } | |
1516 | ||
2871830a | 1517 | static bool add_to_clist(struct lxc_container ***list, struct lxc_container *c, int pos, bool sort) |
9c88ff1f ÇO |
1518 | { |
1519 | struct lxc_container **newlist = realloc(*list, (pos+1) * sizeof(struct lxc_container *)); | |
1520 | if (!newlist) { | |
1521 | ERROR("Out of memory"); | |
1522 | return false; | |
1523 | } | |
1524 | ||
1525 | *list = newlist; | |
1526 | newlist[pos] = c; | |
1527 | ||
1528 | // sort the arrray as we will use binary search on it | |
2871830a DE |
1529 | if (sort) |
1530 | qsort(newlist, pos + 1, sizeof(struct lxc_container *), (int (*)(const void *,const void *))container_cmp); | |
9c88ff1f ÇO |
1531 | |
1532 | return true; | |
1533 | } | |
1534 | ||
1535 | static char** get_from_array(char ***names, char *cname, int size) | |
1536 | { | |
1537 | return (char **)bsearch(&cname, *names, size, sizeof(char *), (int (*)(const void *, const void *))string_cmp); | |
1538 | } | |
1539 | ||
1540 | ||
1541 | static bool array_contains(char ***names, char *cname, int size) { | |
1542 | if(get_from_array(names, cname, size) != NULL) | |
1543 | return true; | |
1544 | return false; | |
1545 | } | |
1546 | ||
1547 | static bool remove_from_array(char ***names, char *cname, int size) | |
1548 | { | |
1549 | char **result = get_from_array(names, cname, size); | |
1550 | if (result != NULL) { | |
1551 | free(result); | |
1552 | return true; | |
1553 | } | |
1554 | return false; | |
1555 | } | |
1556 | ||
799f29ab ÇO |
1557 | static char** lxcapi_get_interfaces(struct lxc_container *c) |
1558 | { | |
ae22a220 ÇO |
1559 | pid_t pid; |
1560 | int i, count = 0, pipefd[2]; | |
9c88ff1f | 1561 | char **interfaces = NULL; |
ae22a220 | 1562 | char interface[IFNAMSIZ]; |
799f29ab | 1563 | |
ae22a220 ÇO |
1564 | if(pipe(pipefd) < 0) { |
1565 | SYSERROR("pipe failed"); | |
1566 | return NULL; | |
c868b261 ÇO |
1567 | } |
1568 | ||
ae22a220 ÇO |
1569 | pid = fork(); |
1570 | if (pid < 0) { | |
959aee9c | 1571 | SYSERROR("failed to fork task to get interfaces information"); |
ae22a220 ÇO |
1572 | close(pipefd[0]); |
1573 | close(pipefd[1]); | |
1574 | return NULL; | |
1575 | } | |
799f29ab | 1576 | |
ae22a220 ÇO |
1577 | if (pid == 0) { // child |
1578 | int ret = 1, nbytes; | |
1579 | struct ifaddrs *interfaceArray = NULL, *tempIfAddr = NULL; | |
1580 | ||
1581 | /* close the read-end of the pipe */ | |
1582 | close(pipefd[0]); | |
1583 | ||
1584 | if (!enter_to_ns(c)) { | |
1585 | SYSERROR("failed to enter namespace"); | |
1586 | goto out; | |
1587 | } | |
1588 | ||
1589 | /* Grab the list of interfaces */ | |
1590 | if (getifaddrs(&interfaceArray)) { | |
1591 | SYSERROR("failed to get interfaces list"); | |
1592 | goto out; | |
1593 | } | |
1594 | ||
1595 | /* Iterate through the interfaces */ | |
1596 | for (tempIfAddr = interfaceArray; tempIfAddr != NULL; tempIfAddr = tempIfAddr->ifa_next) { | |
1597 | nbytes = write(pipefd[1], tempIfAddr->ifa_name, IFNAMSIZ); | |
1598 | if (nbytes < 0) { | |
1599 | ERROR("write failed"); | |
1600 | goto out; | |
1601 | } | |
1602 | count++; | |
1603 | } | |
1604 | ret = 0; | |
1605 | ||
1606 | out: | |
1607 | if (interfaceArray) | |
1608 | freeifaddrs(interfaceArray); | |
1609 | ||
1610 | /* close the write-end of the pipe, thus sending EOF to the reader */ | |
1611 | close(pipefd[1]); | |
1612 | exit(ret); | |
799f29ab ÇO |
1613 | } |
1614 | ||
ae22a220 ÇO |
1615 | /* close the write-end of the pipe */ |
1616 | close(pipefd[1]); | |
1617 | ||
358afd84 | 1618 | while (read(pipefd[0], &interface, IFNAMSIZ) == IFNAMSIZ) { |
ae22a220 ÇO |
1619 | if (array_contains(&interfaces, interface, count)) |
1620 | continue; | |
799f29ab | 1621 | |
ae22a220 ÇO |
1622 | if(!add_to_array(&interfaces, interface, count)) |
1623 | ERROR("PARENT: add_to_array failed"); | |
9c88ff1f ÇO |
1624 | count++; |
1625 | } | |
799f29ab | 1626 | |
ae22a220 ÇO |
1627 | if (wait_for_pid(pid) != 0) { |
1628 | for(i=0;i<count;i++) | |
1629 | free(interfaces[i]); | |
1630 | free(interfaces); | |
1631 | interfaces = NULL; | |
1632 | } | |
9c88ff1f | 1633 | |
ae22a220 ÇO |
1634 | /* close the read-end of the pipe */ |
1635 | close(pipefd[0]); | |
799f29ab | 1636 | |
9c88ff1f ÇO |
1637 | /* Append NULL to the array */ |
1638 | if(interfaces) | |
1639 | interfaces = (char **)lxc_append_null_to_array((void **)interfaces, count); | |
799f29ab | 1640 | |
9c88ff1f | 1641 | return interfaces; |
799f29ab ÇO |
1642 | } |
1643 | ||
f0ca2726 | 1644 | static char** lxcapi_get_ips(struct lxc_container *c, const char* interface, const char* family, int scope) |
799f29ab | 1645 | { |
ae22a220 ÇO |
1646 | pid_t pid; |
1647 | int i, count = 0, pipefd[2]; | |
9c88ff1f | 1648 | char **addresses = NULL; |
ae22a220 | 1649 | char address[INET6_ADDRSTRLEN]; |
799f29ab | 1650 | |
ae22a220 ÇO |
1651 | if(pipe(pipefd) < 0) { |
1652 | SYSERROR("pipe failed"); | |
1653 | return NULL; | |
c868b261 ÇO |
1654 | } |
1655 | ||
ae22a220 ÇO |
1656 | pid = fork(); |
1657 | if (pid < 0) { | |
959aee9c | 1658 | SYSERROR("failed to fork task to get container ips"); |
ae22a220 ÇO |
1659 | close(pipefd[0]); |
1660 | close(pipefd[1]); | |
1661 | return NULL; | |
9c83a661 SG |
1662 | } |
1663 | ||
ae22a220 ÇO |
1664 | if (pid == 0) { // child |
1665 | int ret = 1, nbytes; | |
1666 | struct ifaddrs *interfaceArray = NULL, *tempIfAddr = NULL; | |
1667 | char addressOutputBuffer[INET6_ADDRSTRLEN]; | |
1668 | void *tempAddrPtr = NULL; | |
1669 | char *address = NULL; | |
fe218ca3 | 1670 | |
ae22a220 ÇO |
1671 | /* close the read-end of the pipe */ |
1672 | close(pipefd[0]); | |
1673 | ||
1674 | if (!enter_to_ns(c)) { | |
1675 | SYSERROR("failed to enter namespace"); | |
1676 | goto out; | |
9c83a661 | 1677 | } |
ae22a220 ÇO |
1678 | |
1679 | /* Grab the list of interfaces */ | |
1680 | if (getifaddrs(&interfaceArray)) { | |
1681 | SYSERROR("failed to get interfaces list"); | |
1682 | goto out; | |
1683 | } | |
1684 | ||
1685 | /* Iterate through the interfaces */ | |
1686 | for (tempIfAddr = interfaceArray; tempIfAddr != NULL; tempIfAddr = tempIfAddr->ifa_next) { | |
1687 | if (tempIfAddr->ifa_addr == NULL) | |
9c83a661 SG |
1688 | continue; |
1689 | ||
ae22a220 ÇO |
1690 | if(tempIfAddr->ifa_addr->sa_family == AF_INET) { |
1691 | if (family && strcmp(family, "inet")) | |
1692 | continue; | |
1693 | tempAddrPtr = &((struct sockaddr_in *)tempIfAddr->ifa_addr)->sin_addr; | |
1694 | } | |
1695 | else { | |
1696 | if (family && strcmp(family, "inet6")) | |
1697 | continue; | |
1698 | ||
1699 | if (((struct sockaddr_in6 *)tempIfAddr->ifa_addr)->sin6_scope_id != scope) | |
1700 | continue; | |
1701 | ||
1702 | tempAddrPtr = &((struct sockaddr_in6 *)tempIfAddr->ifa_addr)->sin6_addr; | |
1703 | } | |
1704 | ||
1705 | if (interface && strcmp(interface, tempIfAddr->ifa_name)) | |
1706 | continue; | |
1707 | else if (!interface && strcmp("lo", tempIfAddr->ifa_name) == 0) | |
9c83a661 SG |
1708 | continue; |
1709 | ||
ae22a220 ÇO |
1710 | address = (char *)inet_ntop(tempIfAddr->ifa_addr->sa_family, |
1711 | tempAddrPtr, | |
1712 | addressOutputBuffer, | |
1713 | sizeof(addressOutputBuffer)); | |
1714 | if (!address) | |
1715 | continue; | |
1716 | ||
1717 | nbytes = write(pipefd[1], address, INET6_ADDRSTRLEN); | |
1718 | if (nbytes < 0) { | |
1719 | ERROR("write failed"); | |
1720 | goto out; | |
1721 | } | |
1722 | count++; | |
9c83a661 | 1723 | } |
ae22a220 | 1724 | ret = 0; |
9c83a661 | 1725 | |
ae22a220 ÇO |
1726 | out: |
1727 | if(interfaceArray) | |
1728 | freeifaddrs(interfaceArray); | |
9c83a661 | 1729 | |
ae22a220 ÇO |
1730 | /* close the write-end of the pipe, thus sending EOF to the reader */ |
1731 | close(pipefd[1]); | |
1732 | exit(ret); | |
6849cb5b | 1733 | } |
9c83a661 | 1734 | |
ae22a220 ÇO |
1735 | /* close the write-end of the pipe */ |
1736 | close(pipefd[1]); | |
1737 | ||
358afd84 | 1738 | while (read(pipefd[0], &address, INET6_ADDRSTRLEN) == INET6_ADDRSTRLEN) { |
9c88ff1f | 1739 | if(!add_to_array(&addresses, address, count)) |
ae22a220 | 1740 | ERROR("PARENT: add_to_array failed"); |
9c88ff1f | 1741 | count++; |
9c83a661 SG |
1742 | } |
1743 | ||
ae22a220 ÇO |
1744 | if (wait_for_pid(pid) != 0) { |
1745 | for(i=0;i<count;i++) | |
1746 | free(addresses[i]); | |
1747 | free(addresses); | |
1748 | addresses = NULL; | |
1749 | } | |
9c83a661 | 1750 | |
ae22a220 ÇO |
1751 | /* close the read-end of the pipe */ |
1752 | close(pipefd[0]); | |
9c83a661 SG |
1753 | |
1754 | /* Append NULL to the array */ | |
9c88ff1f ÇO |
1755 | if(addresses) |
1756 | addresses = (char **)lxc_append_null_to_array((void **)addresses, count); | |
9c83a661 SG |
1757 | |
1758 | return addresses; | |
1759 | } | |
1760 | ||
12a50cc6 | 1761 | static int lxcapi_get_config_item(struct lxc_container *c, const char *key, char *retv, int inlen) |
72d0e1cb SG |
1762 | { |
1763 | int ret; | |
1764 | ||
1765 | if (!c || !c->lxc_conf) | |
1766 | return -1; | |
5cee8c50 | 1767 | if (container_mem_lock(c)) |
72d0e1cb | 1768 | return -1; |
72d0e1cb | 1769 | ret = lxc_get_config_item(c->lxc_conf, key, retv, inlen); |
5cee8c50 | 1770 | container_mem_unlock(c); |
72d0e1cb SG |
1771 | return ret; |
1772 | } | |
1773 | ||
8ac18377 ÇO |
1774 | static char* lxcapi_get_running_config_item(struct lxc_container *c, const char *key) |
1775 | { | |
1776 | char *ret; | |
1777 | ||
1778 | if (!c || !c->lxc_conf) | |
1779 | return NULL; | |
1780 | if (container_mem_lock(c)) | |
1781 | return NULL; | |
1782 | ret = lxc_cmd_get_config_item(c->name, key, c->get_config_path(c)); | |
1783 | container_mem_unlock(c); | |
1784 | return ret; | |
1785 | } | |
1786 | ||
12a50cc6 | 1787 | static int lxcapi_get_keys(struct lxc_container *c, const char *key, char *retv, int inlen) |
72d0e1cb SG |
1788 | { |
1789 | if (!key) | |
1790 | return lxc_listconfigs(retv, inlen); | |
1791 | /* | |
1792 | * Support 'lxc.network.<idx>', i.e. 'lxc.network.0' | |
1793 | * This is an intelligent result to show which keys are valid given | |
1794 | * the type of nic it is | |
1795 | */ | |
1796 | if (!c || !c->lxc_conf) | |
1797 | return -1; | |
5cee8c50 | 1798 | if (container_mem_lock(c)) |
72d0e1cb SG |
1799 | return -1; |
1800 | int ret = -1; | |
1801 | if (strncmp(key, "lxc.network.", 12) == 0) | |
6849cb5b | 1802 | ret = lxc_list_nicconfigs(c->lxc_conf, key, retv, inlen); |
5cee8c50 | 1803 | container_mem_unlock(c); |
72d0e1cb SG |
1804 | return ret; |
1805 | } | |
1806 | ||
12a50cc6 | 1807 | static bool lxcapi_save_config(struct lxc_container *c, const char *alt_file) |
72d0e1cb | 1808 | { |
39dc698c SH |
1809 | FILE *fout; |
1810 | bool ret = false, need_disklock = false; | |
1811 | int lret; | |
1812 | ||
72d0e1cb SG |
1813 | if (!alt_file) |
1814 | alt_file = c->configfile; | |
1815 | if (!alt_file) | |
6849cb5b | 1816 | return false; // should we write to stdout if no file is specified? |
39dc698c SH |
1817 | |
1818 | // If we haven't yet loaded a config, load the stock config | |
1819 | if (!c->lxc_conf) { | |
dad87e3b | 1820 | if (!c->load_config(c, lxc_global_config_value("lxc.default_config"))) { |
959aee9c | 1821 | ERROR("Error loading default configuration file %s while saving %s", lxc_global_config_value("lxc.default_config"), c->name); |
72d0e1cb SG |
1822 | return false; |
1823 | } | |
39dc698c | 1824 | } |
72d0e1cb | 1825 | |
5a3d2e1e SG |
1826 | if (!create_container_dir(c)) |
1827 | return false; | |
1828 | ||
39dc698c SH |
1829 | /* |
1830 | * If we're writing to the container's config file, take the | |
1831 | * disk lock. Otherwise just take the memlock to protect the | |
1832 | * struct lxc_container while we're traversing it. | |
1833 | */ | |
1834 | if (strcmp(c->configfile, alt_file) == 0) | |
1835 | need_disklock = true; | |
1836 | ||
1837 | if (need_disklock) | |
1838 | lret = container_disk_lock(c); | |
1839 | else | |
1840 | lret = container_mem_lock(c); | |
1841 | ||
1842 | if (lret) | |
72d0e1cb | 1843 | return false; |
39dc698c SH |
1844 | |
1845 | fout = fopen(alt_file, "w"); | |
1846 | if (!fout) | |
1847 | goto out; | |
72d0e1cb SG |
1848 | write_config(fout, c->lxc_conf); |
1849 | fclose(fout); | |
39dc698c SH |
1850 | ret = true; |
1851 | ||
1852 | out: | |
1853 | if (need_disklock) | |
1854 | container_disk_unlock(c); | |
1855 | else | |
1856 | container_mem_unlock(c); | |
1857 | return ret; | |
72d0e1cb SG |
1858 | } |
1859 | ||
dfb31b25 SH |
1860 | static bool mod_rdep(struct lxc_container *c, bool inc) |
1861 | { | |
1862 | char path[MAXPATHLEN]; | |
1863 | int ret, v = 0; | |
1864 | FILE *f; | |
1865 | bool bret = false; | |
1866 | ||
1867 | if (container_disk_lock(c)) | |
1868 | return false; | |
1869 | ret = snprintf(path, MAXPATHLEN, "%s/%s/lxc_snapshots", c->config_path, | |
1870 | c->name); | |
1871 | if (ret < 0 || ret > MAXPATHLEN) | |
1872 | goto out; | |
1873 | f = fopen(path, "r"); | |
1874 | if (f) { | |
1875 | ret = fscanf(f, "%d", &v); | |
1876 | fclose(f); | |
1877 | if (ret != 1) { | |
1878 | ERROR("Corrupted file %s", path); | |
1879 | goto out; | |
1880 | } | |
1881 | } | |
1882 | v += inc ? 1 : -1; | |
1883 | f = fopen(path, "w"); | |
1884 | if (!f) | |
1885 | goto out; | |
1886 | if (fprintf(f, "%d\n", v) < 0) { | |
1887 | ERROR("Error writing new snapshots value"); | |
1888 | fclose(f); | |
1889 | goto out; | |
1890 | } | |
025ed0f3 | 1891 | ret = fclose(f); |
025ed0f3 | 1892 | if (ret != 0) { |
dfb31b25 SH |
1893 | SYSERROR("Error writing to or closing snapshots file"); |
1894 | goto out; | |
1895 | } | |
1896 | ||
1897 | bret = true; | |
1898 | ||
1899 | out: | |
1900 | container_disk_unlock(c); | |
1901 | return bret; | |
1902 | } | |
1903 | ||
1904 | static void strip_newline(char *p) | |
1905 | { | |
1906 | size_t len = strlen(p); | |
1907 | if (len < 1) | |
1908 | return; | |
1909 | if (p[len-1] == '\n') | |
1910 | p[len-1] = '\0'; | |
1911 | } | |
1912 | ||
1913 | static void mod_all_rdeps(struct lxc_container *c, bool inc) | |
1914 | { | |
1915 | struct lxc_container *p; | |
1916 | char *lxcpath = NULL, *lxcname = NULL, path[MAXPATHLEN]; | |
1917 | size_t pathlen = 0, namelen = 0; | |
1918 | FILE *f; | |
1919 | int ret; | |
1920 | ||
1921 | ret = snprintf(path, MAXPATHLEN, "%s/%s/lxc_rdepends", | |
1922 | c->config_path, c->name); | |
1923 | if (ret < 0 || ret >= MAXPATHLEN) { | |
1924 | ERROR("Path name too long"); | |
1925 | return; | |
1926 | } | |
025ed0f3 | 1927 | f = fopen(path, "r"); |
025ed0f3 | 1928 | if (f == NULL) |
dfb31b25 SH |
1929 | return; |
1930 | while (getline(&lxcpath, &pathlen, f) != -1) { | |
1931 | if (getline(&lxcname, &namelen, f) == -1) { | |
959aee9c | 1932 | ERROR("badly formatted file %s", path); |
dfb31b25 SH |
1933 | goto out; |
1934 | } | |
1935 | strip_newline(lxcpath); | |
1936 | strip_newline(lxcname); | |
1937 | if ((p = lxc_container_new(lxcname, lxcpath)) == NULL) { | |
1938 | ERROR("Unable to find dependent container %s:%s", | |
1939 | lxcpath, lxcname); | |
1940 | continue; | |
1941 | } | |
1942 | if (!mod_rdep(p, inc)) | |
1943 | ERROR("Failed to increase numsnapshots for %s:%s", | |
1944 | lxcpath, lxcname); | |
1945 | lxc_container_put(p); | |
1946 | } | |
1947 | out: | |
1948 | if (lxcpath) free(lxcpath); | |
1949 | if (lxcname) free(lxcname); | |
1950 | fclose(f); | |
1951 | } | |
1952 | ||
1953 | static bool has_snapshots(struct lxc_container *c) | |
1954 | { | |
1955 | char path[MAXPATHLEN]; | |
1956 | int ret, v; | |
1957 | FILE *f; | |
1958 | bool bret = false; | |
1959 | ||
1960 | ret = snprintf(path, MAXPATHLEN, "%s/%s/lxc_snapshots", c->config_path, | |
1961 | c->name); | |
1962 | if (ret < 0 || ret > MAXPATHLEN) | |
1963 | goto out; | |
1964 | f = fopen(path, "r"); | |
1965 | if (!f) | |
1966 | goto out; | |
1967 | ret = fscanf(f, "%d", &v); | |
1968 | fclose(f); | |
1969 | if (ret != 1) | |
1970 | goto out; | |
1971 | bret = v != 0; | |
1972 | ||
1973 | out: | |
1974 | return bret; | |
1975 | } | |
1976 | ||
4355ab5f SH |
1977 | static int lxc_rmdir_onedev_wrapper(void *data) |
1978 | { | |
1979 | char *arg = (char *) data; | |
1980 | return lxc_rmdir_onedev(arg); | |
1981 | } | |
1982 | ||
44a706bd SH |
1983 | static int do_bdev_destroy(struct lxc_conf *conf) |
1984 | { | |
1985 | struct bdev *r; | |
1986 | int ret = 0; | |
1987 | ||
76a26f55 | 1988 | r = bdev_init(conf, conf->rootfs.path, conf->rootfs.mount, NULL); |
44a706bd SH |
1989 | if (!r) |
1990 | return -1; | |
1991 | ||
1992 | if (r->ops->destroy(r) < 0) | |
1993 | ret = -1; | |
1994 | bdev_put(r); | |
1995 | return ret; | |
1996 | } | |
1997 | ||
1998 | static int bdev_destroy_wrapper(void *data) | |
1999 | { | |
2000 | struct lxc_conf *conf = data; | |
2001 | ||
2002 | if (setgid(0) < 0) { | |
2003 | ERROR("Failed to setgid to 0"); | |
2004 | return -1; | |
2005 | } | |
2006 | if (setgroups(0, NULL) < 0) | |
2007 | WARN("Failed to clear groups"); | |
2008 | if (setuid(0) < 0) { | |
2009 | ERROR("Failed to setuid to 0"); | |
2010 | return -1; | |
2011 | } | |
2012 | return do_bdev_destroy(conf); | |
2013 | } | |
2014 | ||
60bf62d4 | 2015 | // do we want the api to support --force, or leave that to the caller? |
72d0e1cb SG |
2016 | static bool lxcapi_destroy(struct lxc_container *c) |
2017 | { | |
c868b261 | 2018 | bool bret = false; |
fef48dc9 | 2019 | int ret; |
72d0e1cb | 2020 | |
1897e3bc | 2021 | if (!c || !lxcapi_is_defined(c)) |
5a3d2e1e SG |
2022 | return false; |
2023 | ||
3bc449ed | 2024 | if (container_disk_lock(c)) |
72d0e1cb | 2025 | return false; |
72d0e1cb | 2026 | |
39dc698c | 2027 | if (!is_stopped(c)) { |
60bf62d4 SH |
2028 | // we should queue some sort of error - in c->error_string? |
2029 | ERROR("container %s is not stopped", c->name); | |
2030 | goto out; | |
72d0e1cb SG |
2031 | } |
2032 | ||
dfb31b25 | 2033 | if (c->lxc_conf && has_snapshots(c)) { |
2a2d36a4 | 2034 | ERROR("container %s has dependent snapshots", c->name); |
dfb31b25 SH |
2035 | goto out; |
2036 | } | |
2037 | ||
44a706bd SH |
2038 | if (c->lxc_conf && c->lxc_conf->rootfs.path && c->lxc_conf->rootfs.mount) { |
2039 | if (am_unpriv()) | |
2040 | ret = userns_exec_1(c->lxc_conf, bdev_destroy_wrapper, c->lxc_conf); | |
2041 | else | |
2042 | ret = do_bdev_destroy(c->lxc_conf); | |
2043 | if (ret < 0) { | |
2044 | ERROR("Error destroying rootfs for %s", c->name); | |
2045 | goto out; | |
60bf62d4 SH |
2046 | } |
2047 | } | |
2048 | ||
dfb31b25 SH |
2049 | mod_all_rdeps(c, false); |
2050 | ||
60bf62d4 SH |
2051 | const char *p1 = lxcapi_get_config_path(c); |
2052 | char *path = alloca(strlen(p1) + strlen(c->name) + 2); | |
2053 | sprintf(path, "%s/%s", p1, c->name); | |
c868b261 | 2054 | if (am_unpriv()) |
4355ab5f SH |
2055 | ret = userns_exec_1(c->lxc_conf, lxc_rmdir_onedev_wrapper, path); |
2056 | else | |
2057 | ret = lxc_rmdir_onedev(path); | |
2058 | if (ret < 0) { | |
60bf62d4 SH |
2059 | ERROR("Error destroying container directory for %s", c->name); |
2060 | goto out; | |
2061 | } | |
fef48dc9 | 2062 | bret = true; |
60bf62d4 SH |
2063 | |
2064 | out: | |
3bc449ed | 2065 | container_disk_unlock(c); |
fef48dc9 | 2066 | return bret; |
72d0e1cb SG |
2067 | } |
2068 | ||
96532523 SH |
2069 | static bool set_config_item_locked(struct lxc_container *c, const char *key, const char *v) |
2070 | { | |
2071 | struct lxc_config_t *config; | |
2072 | ||
2073 | if (!c->lxc_conf) | |
2074 | c->lxc_conf = lxc_conf_init(); | |
2075 | if (!c->lxc_conf) | |
2076 | return false; | |
2077 | config = lxc_getconfig(key); | |
2078 | if (!config) | |
2079 | return false; | |
2080 | return (0 == config->cb(key, v, c->lxc_conf)); | |
2081 | } | |
2082 | ||
12a50cc6 | 2083 | static bool lxcapi_set_config_item(struct lxc_container *c, const char *key, const char *v) |
72d0e1cb | 2084 | { |
72d0e1cb | 2085 | bool b = false; |
72d0e1cb SG |
2086 | |
2087 | if (!c) | |
2088 | return false; | |
2089 | ||
5cee8c50 | 2090 | if (container_mem_lock(c)) |
72d0e1cb SG |
2091 | return false; |
2092 | ||
96532523 | 2093 | b = set_config_item_locked(c, key, v); |
72d0e1cb | 2094 | |
5cee8c50 | 2095 | container_mem_unlock(c); |
72d0e1cb SG |
2096 | return b; |
2097 | } | |
2098 | ||
2099 | static char *lxcapi_config_file_name(struct lxc_container *c) | |
2100 | { | |
2101 | if (!c || !c->configfile) | |
2102 | return NULL; | |
2103 | return strdup(c->configfile); | |
2104 | } | |
2105 | ||
2a59a681 SH |
2106 | static const char *lxcapi_get_config_path(struct lxc_container *c) |
2107 | { | |
2108 | if (!c || !c->config_path) | |
2109 | return NULL; | |
2110 | return (const char *)(c->config_path); | |
2111 | } | |
2112 | ||
afeecbba SH |
2113 | /* |
2114 | * not for export | |
2115 | * Just recalculate the c->configfile based on the | |
2116 | * c->config_path, which must be set. | |
2117 | * The lxc_container must be locked or not yet public. | |
2118 | */ | |
2119 | static bool set_config_filename(struct lxc_container *c) | |
2120 | { | |
2121 | char *newpath; | |
2122 | int len, ret; | |
2123 | ||
2124 | if (!c->config_path) | |
2125 | return false; | |
2126 | ||
2127 | /* $lxc_path + "/" + c->name + "/" + "config" + '\0' */ | |
2128 | len = strlen(c->config_path) + strlen(c->name) + strlen("config") + 3; | |
2129 | newpath = malloc(len); | |
2130 | if (!newpath) | |
2131 | return false; | |
2132 | ||
2133 | ret = snprintf(newpath, len, "%s/%s/config", c->config_path, c->name); | |
2134 | if (ret < 0 || ret >= len) { | |
2135 | fprintf(stderr, "Error printing out config file name\n"); | |
2136 | free(newpath); | |
2137 | return false; | |
2138 | } | |
2139 | ||
2140 | if (c->configfile) | |
2141 | free(c->configfile); | |
2142 | c->configfile = newpath; | |
2143 | ||
2144 | return true; | |
2145 | } | |
2146 | ||
2a59a681 SH |
2147 | static bool lxcapi_set_config_path(struct lxc_container *c, const char *path) |
2148 | { | |
2149 | char *p; | |
2150 | bool b = false; | |
afeecbba | 2151 | char *oldpath = NULL; |
2a59a681 SH |
2152 | |
2153 | if (!c) | |
2154 | return b; | |
2155 | ||
5cee8c50 | 2156 | if (container_mem_lock(c)) |
2a59a681 SH |
2157 | return b; |
2158 | ||
2159 | p = strdup(path); | |
afeecbba SH |
2160 | if (!p) { |
2161 | ERROR("Out of memory setting new lxc path"); | |
2a59a681 | 2162 | goto err; |
afeecbba SH |
2163 | } |
2164 | ||
2a59a681 SH |
2165 | b = true; |
2166 | if (c->config_path) | |
afeecbba | 2167 | oldpath = c->config_path; |
2a59a681 | 2168 | c->config_path = p; |
afeecbba SH |
2169 | |
2170 | /* Since we've changed the config path, we have to change the | |
2171 | * config file name too */ | |
2172 | if (!set_config_filename(c)) { | |
2173 | ERROR("Out of memory setting new config filename"); | |
2174 | b = false; | |
2175 | free(c->config_path); | |
2176 | c->config_path = oldpath; | |
2177 | oldpath = NULL; | |
2178 | } | |
2a59a681 | 2179 | err: |
afeecbba SH |
2180 | if (oldpath) |
2181 | free(oldpath); | |
5cee8c50 | 2182 | container_mem_unlock(c); |
2a59a681 SH |
2183 | return b; |
2184 | } | |
2185 | ||
2186 | ||
794dd120 SH |
2187 | static bool lxcapi_set_cgroup_item(struct lxc_container *c, const char *subsys, const char *value) |
2188 | { | |
2189 | int ret; | |
794dd120 SH |
2190 | |
2191 | if (!c) | |
2192 | return false; | |
2193 | ||
3bc449ed | 2194 | if (is_stopped(c)) |
794dd120 SH |
2195 | return false; |
2196 | ||
3bc449ed SH |
2197 | if (container_disk_lock(c)) |
2198 | return false; | |
794dd120 | 2199 | |
33ad9f1a | 2200 | ret = lxc_cgroup_set(subsys, value, c->name, c->config_path); |
3bc449ed SH |
2201 | |
2202 | container_disk_unlock(c); | |
2203 | return ret == 0; | |
794dd120 SH |
2204 | } |
2205 | ||
2206 | static int lxcapi_get_cgroup_item(struct lxc_container *c, const char *subsys, char *retv, int inlen) | |
2207 | { | |
3bc449ed | 2208 | int ret; |
794dd120 | 2209 | |
6502006a | 2210 | if (!c) |
794dd120 SH |
2211 | return -1; |
2212 | ||
3bc449ed | 2213 | if (is_stopped(c)) |
794dd120 SH |
2214 | return -1; |
2215 | ||
3bc449ed SH |
2216 | if (container_disk_lock(c)) |
2217 | return -1; | |
794dd120 | 2218 | |
33ad9f1a | 2219 | ret = lxc_cgroup_get(subsys, retv, inlen, c->name, c->config_path); |
794dd120 | 2220 | |
3bc449ed | 2221 | container_disk_unlock(c); |
794dd120 SH |
2222 | return ret; |
2223 | } | |
2224 | ||
593e8478 | 2225 | const char *lxc_get_global_config_item(const char *key) |
83c98d82 | 2226 | { |
593e8478 | 2227 | return lxc_global_config_value(key); |
a8428dfa SH |
2228 | } |
2229 | ||
b6b918a1 SG |
2230 | const char *lxc_get_version(void) |
2231 | { | |
95ee490b | 2232 | return LXC_VERSION; |
b6b918a1 SG |
2233 | } |
2234 | ||
f0ca2726 | 2235 | static int copy_file(const char *old, const char *new) |
9be53773 SH |
2236 | { |
2237 | int in, out; | |
2238 | ssize_t len, ret; | |
2239 | char buf[8096]; | |
2240 | struct stat sbuf; | |
2241 | ||
2242 | if (file_exists(new)) { | |
2243 | ERROR("copy destination %s exists", new); | |
2244 | return -1; | |
2245 | } | |
2246 | ret = stat(old, &sbuf); | |
2247 | if (ret < 0) { | |
dfb31b25 | 2248 | INFO("Error stat'ing %s", old); |
9be53773 SH |
2249 | return -1; |
2250 | } | |
2251 | ||
2252 | in = open(old, O_RDONLY); | |
2253 | if (in < 0) { | |
dfb31b25 | 2254 | SYSERROR("Error opening original file %s", old); |
9be53773 SH |
2255 | return -1; |
2256 | } | |
2257 | out = open(new, O_CREAT | O_EXCL | O_WRONLY, 0644); | |
2258 | if (out < 0) { | |
dfb31b25 | 2259 | SYSERROR("Error opening new file %s", new); |
9be53773 SH |
2260 | close(in); |
2261 | return -1; | |
2262 | } | |
2263 | ||
2264 | while (1) { | |
2265 | len = read(in, buf, 8096); | |
2266 | if (len < 0) { | |
dfb31b25 | 2267 | SYSERROR("Error reading old file %s", old); |
9be53773 SH |
2268 | goto err; |
2269 | } | |
2270 | if (len == 0) | |
2271 | break; | |
2272 | ret = write(out, buf, len); | |
6849cb5b | 2273 | if (ret < len) { // should we retry? |
dfb31b25 | 2274 | SYSERROR("Error: write to new file %s was interrupted", new); |
9be53773 SH |
2275 | goto err; |
2276 | } | |
2277 | } | |
2278 | close(in); | |
2279 | close(out); | |
2280 | ||
2281 | // we set mode, but not owner/group | |
2282 | ret = chmod(new, sbuf.st_mode); | |
2283 | if (ret) { | |
dfb31b25 | 2284 | SYSERROR("Error setting mode on %s", new); |
9be53773 SH |
2285 | return -1; |
2286 | } | |
2287 | ||
2288 | return 0; | |
2289 | ||
2290 | err: | |
2291 | close(in); | |
2292 | close(out); | |
2293 | return -1; | |
2294 | } | |
2295 | ||
9be53773 SH |
2296 | static int copyhooks(struct lxc_container *oldc, struct lxc_container *c) |
2297 | { | |
619256b5 | 2298 | int i, len, ret; |
9be53773 | 2299 | struct lxc_list *it; |
619256b5 ÇO |
2300 | char *cpath; |
2301 | ||
2302 | len = strlen(oldc->config_path) + strlen(oldc->name) + 3; | |
2303 | cpath = alloca(len); | |
2304 | ret = snprintf(cpath, len, "%s/%s/", oldc->config_path, oldc->name); | |
2305 | if (ret < 0 || ret >= len) | |
2306 | return -1; | |
9be53773 SH |
2307 | |
2308 | for (i=0; i<NUM_LXC_HOOKS; i++) { | |
2309 | lxc_list_for_each(it, &c->lxc_conf->hooks[i]) { | |
2310 | char *hookname = it->elem; | |
c32981c3 | 2311 | char *fname = strrchr(hookname, '/'); |
9be53773 SH |
2312 | char tmppath[MAXPATHLEN]; |
2313 | if (!fname) // relative path - we don't support, but maybe we should | |
2314 | return 0; | |
619256b5 ÇO |
2315 | if (strncmp(hookname, cpath, len - 1) != 0) { |
2316 | // this hook is public - ignore | |
2317 | continue; | |
2318 | } | |
9be53773 SH |
2319 | // copy the script, and change the entry in confile |
2320 | ret = snprintf(tmppath, MAXPATHLEN, "%s/%s/%s", | |
2321 | c->config_path, c->name, fname+1); | |
2322 | if (ret < 0 || ret >= MAXPATHLEN) | |
2323 | return -1; | |
2324 | ret = copy_file(it->elem, tmppath); | |
2325 | if (ret < 0) | |
2326 | return -1; | |
2327 | free(it->elem); | |
2328 | it->elem = strdup(tmppath); | |
2329 | if (!it->elem) { | |
2330 | ERROR("out of memory copying hook path"); | |
2331 | return -1; | |
2332 | } | |
9be53773 SH |
2333 | } |
2334 | } | |
2335 | ||
2336 | c->save_config(c, NULL); | |
2337 | return 0; | |
2338 | } | |
2339 | ||
2340 | static void new_hwaddr(char *hwaddr) | |
2341 | { | |
025ed0f3 | 2342 | FILE *f; |
025ed0f3 | 2343 | f = fopen("/dev/urandom", "r"); |
9be53773 SH |
2344 | if (f) { |
2345 | unsigned int seed; | |
2346 | int ret = fread(&seed, sizeof(seed), 1, f); | |
2347 | if (ret != 1) | |
2348 | seed = time(NULL); | |
2349 | fclose(f); | |
2350 | srand(seed); | |
2351 | } else | |
2352 | srand(time(NULL)); | |
2353 | snprintf(hwaddr, 18, "00:16:3e:%02x:%02x:%02x", | |
2354 | rand() % 255, rand() % 255, rand() % 255); | |
2355 | } | |
2356 | ||
2357 | static void network_new_hwaddrs(struct lxc_container *c) | |
2358 | { | |
2359 | struct lxc_list *it; | |
2360 | ||
2361 | lxc_list_for_each(it, &c->lxc_conf->network) { | |
2362 | struct lxc_netdev *n = it->elem; | |
2363 | if (n->hwaddr) | |
2364 | new_hwaddr(n->hwaddr); | |
2365 | } | |
2366 | } | |
2367 | ||
2368 | static int copy_fstab(struct lxc_container *oldc, struct lxc_container *c) | |
2369 | { | |
2370 | char newpath[MAXPATHLEN]; | |
2371 | char *oldpath = oldc->lxc_conf->fstab; | |
2372 | int ret; | |
2373 | ||
2374 | if (!oldpath) | |
2375 | return 0; | |
2376 | ||
c32981c3 | 2377 | char *p = strrchr(oldpath, '/'); |
9be53773 SH |
2378 | if (!p) |
2379 | return -1; | |
2380 | ret = snprintf(newpath, MAXPATHLEN, "%s/%s%s", | |
2381 | c->config_path, c->name, p); | |
2382 | if (ret < 0 || ret >= MAXPATHLEN) { | |
2383 | ERROR("error printing new path for %s", oldpath); | |
2384 | return -1; | |
2385 | } | |
2386 | if (file_exists(newpath)) { | |
2387 | ERROR("error: fstab file %s exists", newpath); | |
2388 | return -1; | |
2389 | } | |
2390 | ||
2391 | if (copy_file(oldpath, newpath) < 0) { | |
2392 | ERROR("error: copying %s to %s", oldpath, newpath); | |
2393 | return -1; | |
2394 | } | |
2395 | free(c->lxc_conf->fstab); | |
2396 | c->lxc_conf->fstab = strdup(newpath); | |
2397 | if (!c->lxc_conf->fstab) { | |
2398 | ERROR("error: allocating pathname"); | |
2399 | return -1; | |
2400 | } | |
2401 | ||
2402 | return 0; | |
2403 | } | |
2404 | ||
dfb31b25 SH |
2405 | static void copy_rdepends(struct lxc_container *c, struct lxc_container *c0) |
2406 | { | |
2407 | char path0[MAXPATHLEN], path1[MAXPATHLEN]; | |
2408 | int ret; | |
2409 | ||
2410 | ret = snprintf(path0, MAXPATHLEN, "%s/%s/lxc_rdepends", c0->config_path, | |
2411 | c0->name); | |
2412 | if (ret < 0 || ret >= MAXPATHLEN) { | |
2413 | WARN("Error copying reverse dependencies"); | |
2414 | return; | |
2415 | } | |
2416 | ret = snprintf(path1, MAXPATHLEN, "%s/%s/lxc_rdepends", c->config_path, | |
2417 | c->name); | |
2418 | if (ret < 0 || ret >= MAXPATHLEN) { | |
2419 | WARN("Error copying reverse dependencies"); | |
2420 | return; | |
2421 | } | |
2422 | if (copy_file(path0, path1) < 0) { | |
2423 | INFO("Error copying reverse dependencies"); | |
2424 | return; | |
2425 | } | |
2426 | } | |
2427 | ||
2428 | static bool add_rdepends(struct lxc_container *c, struct lxc_container *c0) | |
2429 | { | |
2430 | int ret; | |
2431 | char path[MAXPATHLEN]; | |
2432 | FILE *f; | |
2433 | bool bret; | |
2434 | ||
2435 | ret = snprintf(path, MAXPATHLEN, "%s/%s/lxc_rdepends", c->config_path, | |
2436 | c->name); | |
2437 | if (ret < 0 || ret >= MAXPATHLEN) | |
2438 | return false; | |
2439 | f = fopen(path, "a"); | |
2440 | if (!f) | |
2441 | return false; | |
2442 | bret = true; | |
2443 | // if anything goes wrong, just return an error | |
2444 | if (fprintf(f, "%s\n%s\n", c0->config_path, c0->name) < 0) | |
2445 | bret = false; | |
2446 | if (fclose(f) != 0) | |
2447 | bret = false; | |
2448 | return bret; | |
2449 | } | |
2450 | ||
9be53773 | 2451 | static int copy_storage(struct lxc_container *c0, struct lxc_container *c, |
d659597e | 2452 | const char *newtype, int flags, const char *bdevdata, uint64_t newsize) |
9be53773 SH |
2453 | { |
2454 | struct bdev *bdev; | |
dfb31b25 | 2455 | int need_rdep; |
9be53773 | 2456 | |
1354955b | 2457 | bdev = bdev_copy(c0, c->name, c->config_path, newtype, flags, |
dfb31b25 | 2458 | bdevdata, newsize, &need_rdep); |
9be53773 | 2459 | if (!bdev) { |
dfb31b25 | 2460 | ERROR("Error copying storage"); |
9be53773 SH |
2461 | return -1; |
2462 | } | |
2463 | free(c->lxc_conf->rootfs.path); | |
2464 | c->lxc_conf->rootfs.path = strdup(bdev->src); | |
2465 | bdev_put(bdev); | |
dfb31b25 SH |
2466 | if (!c->lxc_conf->rootfs.path) { |
2467 | ERROR("Out of memory while setting storage path"); | |
9be53773 | 2468 | return -1; |
dfb31b25 | 2469 | } |
eee59f94 SH |
2470 | if (flags & LXC_CLONE_SNAPSHOT) |
2471 | copy_rdepends(c, c0); | |
dfb31b25 SH |
2472 | if (need_rdep) { |
2473 | if (!add_rdepends(c, c0)) | |
2474 | WARN("Error adding reverse dependency from %s to %s", | |
2475 | c->name, c0->name); | |
2476 | } | |
2477 | ||
2478 | mod_all_rdeps(c, true); | |
2479 | ||
9be53773 SH |
2480 | return 0; |
2481 | } | |
2482 | ||
1354955b SH |
2483 | struct clone_update_data { |
2484 | struct lxc_container *c0; | |
2485 | struct lxc_container *c1; | |
2486 | int flags; | |
2487 | char **hookargs; | |
2488 | }; | |
2489 | ||
2490 | static int clone_update_rootfs(struct clone_update_data *data) | |
9be53773 | 2491 | { |
1354955b SH |
2492 | struct lxc_container *c0 = data->c0; |
2493 | struct lxc_container *c = data->c1; | |
2494 | int flags = data->flags; | |
2495 | char **hookargs = data->hookargs; | |
9be53773 SH |
2496 | int ret = -1; |
2497 | char path[MAXPATHLEN]; | |
2498 | struct bdev *bdev; | |
2499 | FILE *fout; | |
148e91f5 | 2500 | struct lxc_conf *conf = c->lxc_conf; |
9be53773 SH |
2501 | |
2502 | /* update hostname in rootfs */ | |
2503 | /* we're going to mount, so run in a clean namespace to simplify cleanup */ | |
2504 | ||
1354955b SH |
2505 | if (setgid(0) < 0) { |
2506 | ERROR("Failed to setgid to 0"); | |
2507 | return -1; | |
2508 | } | |
2509 | if (setuid(0) < 0) { | |
2510 | ERROR("Failed to setuid to 0"); | |
9be53773 | 2511 | return -1; |
1354955b | 2512 | } |
c476bdce SH |
2513 | if (setgroups(0, NULL) < 0) |
2514 | WARN("Failed to clear groups"); | |
9be53773 | 2515 | |
1354955b SH |
2516 | if (unshare(CLONE_NEWNS) < 0) |
2517 | return -1; | |
76a26f55 | 2518 | bdev = bdev_init(c->lxc_conf, c->lxc_conf->rootfs.path, c->lxc_conf->rootfs.mount, NULL); |
9be53773 | 2519 | if (!bdev) |
1354955b | 2520 | return -1; |
cf3ef16d SH |
2521 | if (strcmp(bdev->type, "dir") != 0) { |
2522 | if (unshare(CLONE_NEWNS) < 0) { | |
2523 | ERROR("error unsharing mounts"); | |
e7de366c | 2524 | bdev_put(bdev); |
1354955b | 2525 | return -1; |
cf3ef16d | 2526 | } |
2c6f3fc9 SH |
2527 | if (detect_shared_rootfs()) { |
2528 | if (mount(NULL, "/", NULL, MS_SLAVE|MS_REC, NULL)) { | |
2529 | SYSERROR("Failed to make / rslave"); | |
2530 | ERROR("Continuing..."); | |
2531 | } | |
2532 | } | |
e7de366c SG |
2533 | if (bdev->ops->mount(bdev) < 0) { |
2534 | bdev_put(bdev); | |
1354955b | 2535 | return -1; |
e7de366c | 2536 | } |
cf3ef16d SH |
2537 | } else { // TODO come up with a better way |
2538 | if (bdev->dest) | |
2539 | free(bdev->dest); | |
2540 | bdev->dest = strdup(bdev->src); | |
2541 | } | |
148e91f5 SH |
2542 | |
2543 | if (!lxc_list_empty(&conf->hooks[LXCHOOK_CLONE])) { | |
2544 | /* Start of environment variable setup for hooks */ | |
1143ed39 DE |
2545 | if (setenv("LXC_SRC_NAME", c0->name, 1)) { |
2546 | SYSERROR("failed to set environment variable for source container name"); | |
2547 | } | |
148e91f5 SH |
2548 | if (setenv("LXC_NAME", c->name, 1)) { |
2549 | SYSERROR("failed to set environment variable for container name"); | |
2550 | } | |
2551 | if (setenv("LXC_CONFIG_FILE", conf->rcfile, 1)) { | |
2552 | SYSERROR("failed to set environment variable for config path"); | |
2553 | } | |
24ef39f4 | 2554 | if (setenv("LXC_ROOTFS_MOUNT", bdev->dest, 1)) { |
148e91f5 SH |
2555 | SYSERROR("failed to set environment variable for rootfs mount"); |
2556 | } | |
2557 | if (setenv("LXC_ROOTFS_PATH", conf->rootfs.path, 1)) { | |
2558 | SYSERROR("failed to set environment variable for rootfs mount"); | |
2559 | } | |
2560 | ||
283678ed | 2561 | if (run_lxc_hooks(c->name, "clone", conf, c->get_config_path(c), hookargs)) { |
148e91f5 | 2562 | ERROR("Error executing clone hook for %s", c->name); |
e7de366c | 2563 | bdev_put(bdev); |
1354955b | 2564 | return -1; |
148e91f5 SH |
2565 | } |
2566 | } | |
2567 | ||
2568 | if (!(flags & LXC_CLONE_KEEPNAME)) { | |
2569 | ret = snprintf(path, MAXPATHLEN, "%s/etc/hostname", bdev->dest); | |
e7de366c SG |
2570 | bdev_put(bdev); |
2571 | ||
148e91f5 | 2572 | if (ret < 0 || ret >= MAXPATHLEN) |
1354955b | 2573 | return -1; |
8058be39 | 2574 | if (!file_exists(path)) |
1354955b | 2575 | return 0; |
148e91f5 | 2576 | if (!(fout = fopen(path, "w"))) { |
959aee9c | 2577 | SYSERROR("unable to open %s: ignoring", path); |
1354955b | 2578 | return 0; |
148e91f5 | 2579 | } |
a684f0b7 ÇO |
2580 | if (fprintf(fout, "%s", c->name) < 0) { |
2581 | fclose(fout); | |
1354955b | 2582 | return -1; |
6849cb5b | 2583 | } |
148e91f5 | 2584 | if (fclose(fout) < 0) |
1354955b | 2585 | return -1; |
9be53773 | 2586 | } |
e7de366c SG |
2587 | else |
2588 | bdev_put(bdev); | |
2589 | ||
1354955b SH |
2590 | return 0; |
2591 | } | |
2592 | ||
2593 | static int clone_update_rootfs_wrapper(void *data) | |
2594 | { | |
2595 | struct clone_update_data *arg = (struct clone_update_data *) data; | |
2596 | return clone_update_rootfs(arg); | |
9be53773 SH |
2597 | } |
2598 | ||
2599 | /* | |
2600 | * We want to support: | |
2601 | sudo lxc-clone -o o1 -n n1 -s -L|-fssize fssize -v|--vgname vgname \ | |
2602 | -p|--lvprefix lvprefix -t|--fstype fstype -B backingstore | |
2603 | ||
2604 | -s [ implies overlayfs] | |
2605 | -s -B overlayfs | |
2606 | -s -B aufs | |
2607 | ||
2608 | only rootfs gets converted (copied/snapshotted) on clone. | |
2609 | */ | |
2610 | ||
2611 | static int create_file_dirname(char *path) | |
2612 | { | |
c32981c3 | 2613 | char *p = strrchr(path, '/'); |
9be53773 SH |
2614 | int ret; |
2615 | ||
2616 | if (!p) | |
2617 | return -1; | |
2618 | *p = '\0'; | |
2619 | ret = mkdir(path, 0755); | |
2620 | if (ret && errno != EEXIST) | |
959aee9c | 2621 | SYSERROR("creating container path %s", path); |
9be53773 SH |
2622 | *p = '/'; |
2623 | return ret; | |
2624 | } | |
2625 | ||
74a3920a | 2626 | static struct lxc_container *lxcapi_clone(struct lxc_container *c, const char *newname, |
9be53773 | 2627 | const char *lxcpath, int flags, |
d659597e | 2628 | const char *bdevtype, const char *bdevdata, uint64_t newsize, |
148e91f5 | 2629 | char **hookargs) |
9be53773 SH |
2630 | { |
2631 | struct lxc_container *c2 = NULL; | |
2632 | char newpath[MAXPATHLEN]; | |
176d9acb | 2633 | int ret, storage_copied = 0; |
9be53773 | 2634 | const char *n, *l; |
8d2efe40 | 2635 | char *origroot = NULL; |
1354955b | 2636 | struct clone_update_data data; |
9be53773 | 2637 | FILE *fout; |
1354955b | 2638 | pid_t pid; |
9be53773 SH |
2639 | |
2640 | if (!c || !c->is_defined(c)) | |
2641 | return NULL; | |
2642 | ||
5cee8c50 | 2643 | if (container_mem_lock(c)) |
9be53773 SH |
2644 | return NULL; |
2645 | ||
39dc698c | 2646 | if (!is_stopped(c)) { |
9be53773 SH |
2647 | ERROR("error: Original container (%s) is running", c->name); |
2648 | goto out; | |
2649 | } | |
2650 | ||
2651 | // Make sure the container doesn't yet exist. | |
2652 | n = newname ? newname : c->name; | |
2653 | l = lxcpath ? lxcpath : c->get_config_path(c); | |
2654 | ret = snprintf(newpath, MAXPATHLEN, "%s/%s/config", l, n); | |
6849cb5b | 2655 | if (ret < 0 || ret >= MAXPATHLEN) { |
9be53773 SH |
2656 | SYSERROR("clone: failed making config pathname"); |
2657 | goto out; | |
2658 | } | |
2659 | if (file_exists(newpath)) { | |
2660 | ERROR("error: clone: %s exists", newpath); | |
2661 | goto out; | |
2662 | } | |
2663 | ||
96532523 SH |
2664 | ret = create_file_dirname(newpath); |
2665 | if (ret < 0 && errno != EEXIST) { | |
9be53773 SH |
2666 | ERROR("Error creating container dir for %s", newpath); |
2667 | goto out; | |
2668 | } | |
2669 | ||
2670 | // copy the configuration, tweak it as needed, | |
8d2efe40 SH |
2671 | if (c->lxc_conf->rootfs.path) { |
2672 | origroot = c->lxc_conf->rootfs.path; | |
2673 | c->lxc_conf->rootfs.path = NULL; | |
2674 | } | |
9be53773 SH |
2675 | fout = fopen(newpath, "w"); |
2676 | if (!fout) { | |
2677 | SYSERROR("open %s", newpath); | |
2678 | goto out; | |
2679 | } | |
2680 | write_config(fout, c->lxc_conf); | |
2681 | fclose(fout); | |
8d2efe40 | 2682 | c->lxc_conf->rootfs.path = origroot; |
9be53773 | 2683 | |
9be53773 SH |
2684 | sprintf(newpath, "%s/%s/rootfs", l, n); |
2685 | if (mkdir(newpath, 0755) < 0) { | |
2686 | SYSERROR("error creating %s", newpath); | |
2687 | goto out; | |
2688 | } | |
2689 | ||
1354955b SH |
2690 | if (am_unpriv()) { |
2691 | if (chown_mapped_root(newpath, c->lxc_conf) < 0) { | |
959aee9c | 2692 | ERROR("Error chowning %s to container root", newpath); |
1354955b SH |
2693 | goto out; |
2694 | } | |
2695 | } | |
2696 | ||
9be53773 | 2697 | c2 = lxc_container_new(n, l); |
375c2258 | 2698 | if (!c2) { |
9be53773 SH |
2699 | ERROR("clone: failed to create new container (%s %s)", n, l); |
2700 | goto out; | |
2701 | } | |
8d2efe40 SH |
2702 | |
2703 | // copy/snapshot rootfs's | |
2704 | ret = copy_storage(c, c2, bdevtype, flags, bdevdata, newsize); | |
2705 | if (ret < 0) | |
2706 | goto out; | |
9be53773 | 2707 | |
96532523 SH |
2708 | // update utsname |
2709 | if (!set_config_item_locked(c2, "lxc.utsname", newname)) { | |
2710 | ERROR("Error setting new hostname"); | |
2711 | goto out; | |
2712 | } | |
2713 | ||
619256b5 ÇO |
2714 | // copy hooks |
2715 | ret = copyhooks(c, c2); | |
2716 | if (ret < 0) { | |
2717 | ERROR("error copying hooks"); | |
2718 | goto out; | |
9be53773 SH |
2719 | } |
2720 | ||
2721 | if (copy_fstab(c, c2) < 0) { | |
2722 | ERROR("error copying fstab"); | |
9be53773 SH |
2723 | goto out; |
2724 | } | |
2725 | ||
2726 | // update macaddrs | |
2727 | if (!(flags & LXC_CLONE_KEEPMACADDR)) | |
2728 | network_new_hwaddrs(c2); | |
2729 | ||
176d9acb SH |
2730 | // We've now successfully created c2's storage, so clear it out if we |
2731 | // fail after this | |
2732 | storage_copied = 1; | |
2733 | ||
375c2258 | 2734 | if (!c2->save_config(c2, NULL)) |
9be53773 | 2735 | goto out; |
9be53773 | 2736 | |
1354955b SH |
2737 | if ((pid = fork()) < 0) { |
2738 | SYSERROR("fork"); | |
9be53773 | 2739 | goto out; |
1354955b SH |
2740 | } |
2741 | if (pid > 0) { | |
2742 | ret = wait_for_pid(pid); | |
2743 | if (ret) | |
2744 | goto out; | |
2745 | container_mem_unlock(c); | |
2746 | return c2; | |
2747 | } | |
2748 | data.c0 = c; | |
2749 | data.c1 = c2; | |
2750 | data.flags = flags; | |
2751 | data.hookargs = hookargs; | |
2752 | if (am_unpriv()) | |
2753 | ret = userns_exec_1(c->lxc_conf, clone_update_rootfs_wrapper, | |
2754 | &data); | |
2755 | else | |
2756 | ret = clone_update_rootfs(&data); | |
2757 | if (ret < 0) | |
2758 | exit(1); | |
9be53773 | 2759 | |
5cee8c50 | 2760 | container_mem_unlock(c); |
1354955b | 2761 | exit(0); |
9be53773 SH |
2762 | |
2763 | out: | |
5cee8c50 | 2764 | container_mem_unlock(c); |
375c2258 | 2765 | if (c2) { |
176d9acb SH |
2766 | if (!storage_copied) |
2767 | c2->lxc_conf->rootfs.path = NULL; | |
375c2258 | 2768 | c2->destroy(c2); |
9be53773 | 2769 | lxc_container_put(c2); |
375c2258 | 2770 | } |
9be53773 SH |
2771 | |
2772 | return NULL; | |
2773 | } | |
2774 | ||
06e5650e ÇO |
2775 | static bool lxcapi_rename(struct lxc_container *c, const char *newname) |
2776 | { | |
2777 | struct bdev *bdev; | |
2778 | struct lxc_container *newc; | |
06e5650e | 2779 | |
d693cf93 | 2780 | if (!c || !c->name || !c->config_path || !c->lxc_conf) |
06e5650e ÇO |
2781 | return false; |
2782 | ||
76a26f55 | 2783 | bdev = bdev_init(c->lxc_conf, c->lxc_conf->rootfs.path, c->lxc_conf->rootfs.mount, NULL); |
06e5650e ÇO |
2784 | if (!bdev) { |
2785 | ERROR("Failed to find original backing store type"); | |
2786 | return false; | |
2787 | } | |
2788 | ||
619256b5 | 2789 | newc = lxcapi_clone(c, newname, c->config_path, LXC_CLONE_KEEPMACADDR, NULL, bdev->type, 0, NULL); |
06e5650e ÇO |
2790 | bdev_put(bdev); |
2791 | if (!newc) { | |
2792 | lxc_container_put(newc); | |
2793 | return false; | |
2794 | } | |
2795 | ||
2796 | if (newc && lxcapi_is_defined(newc)) | |
2797 | lxc_container_put(newc); | |
2798 | ||
2799 | if (!lxcapi_destroy(c)) { | |
2800 | ERROR("Could not destroy existing container %s", c->name); | |
2801 | return false; | |
2802 | } | |
2803 | return true; | |
2804 | } | |
2805 | ||
a0e93eeb CS |
2806 | 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) |
2807 | { | |
2808 | if (!c) | |
2809 | return -1; | |
2810 | ||
2811 | return lxc_attach(c->name, c->config_path, exec_function, exec_payload, options, attached_process); | |
2812 | } | |
2813 | ||
2814 | static int lxcapi_attach_run_wait(struct lxc_container *c, lxc_attach_options_t *options, const char *program, const char * const argv[]) | |
2815 | { | |
2816 | lxc_attach_command_t command; | |
2817 | pid_t pid; | |
2818 | int r; | |
2819 | ||
2820 | if (!c) | |
2821 | return -1; | |
2822 | ||
2823 | command.program = (char*)program; | |
2824 | command.argv = (char**)argv; | |
2825 | r = lxc_attach(c->name, c->config_path, lxc_attach_run_command, &command, options, &pid); | |
2826 | if (r < 0) { | |
2827 | ERROR("ups"); | |
2828 | return r; | |
2829 | } | |
2830 | return lxc_wait_for_pid_status(pid); | |
2831 | } | |
2832 | ||
74a3920a | 2833 | static int get_next_index(const char *lxcpath, char *cname) |
f5dd1d53 SH |
2834 | { |
2835 | char *fname; | |
2836 | struct stat sb; | |
2837 | int i = 0, ret; | |
2838 | ||
2839 | fname = alloca(strlen(lxcpath) + 20); | |
2840 | while (1) { | |
2841 | sprintf(fname, "%s/snap%d", lxcpath, i); | |
2842 | ret = stat(fname, &sb); | |
2843 | if (ret != 0) | |
2844 | return i; | |
2845 | i++; | |
2846 | } | |
2847 | } | |
2848 | ||
f0ca2726 | 2849 | static int lxcapi_snapshot(struct lxc_container *c, const char *commentfile) |
f5dd1d53 SH |
2850 | { |
2851 | int i, flags, ret; | |
2852 | struct lxc_container *c2; | |
2853 | char snappath[MAXPATHLEN], newname[20]; | |
2854 | ||
f79b86a3 SH |
2855 | // /var/lib/lxc -> /var/lib/lxcsnaps \0 |
2856 | ret = snprintf(snappath, MAXPATHLEN, "%ssnaps/%s", c->config_path, c->name); | |
2857 | if (ret < 0 || ret >= MAXPATHLEN) | |
f5dd1d53 SH |
2858 | return -1; |
2859 | i = get_next_index(snappath, c->name); | |
2860 | ||
2861 | if (mkdir_p(snappath, 0755) < 0) { | |
2862 | ERROR("Failed to create snapshot directory %s", snappath); | |
2863 | return -1; | |
2864 | } | |
2865 | ||
2866 | ret = snprintf(newname, 20, "snap%d", i); | |
2867 | if (ret < 0 || ret >= 20) | |
2868 | return -1; | |
2869 | ||
0a83cbbb SH |
2870 | /* |
2871 | * We pass LXC_CLONE_SNAPSHOT to make sure that a rdepends file entry is | |
2872 | * created in the original container | |
2873 | */ | |
2874 | flags = LXC_CLONE_SNAPSHOT | LXC_CLONE_KEEPMACADDR | LXC_CLONE_KEEPNAME | | |
2875 | LXC_CLONE_KEEPBDEVTYPE | LXC_CLONE_MAYBE_SNAPSHOT; | |
76a26f55 | 2876 | if (bdev_is_dir(c->lxc_conf, c->lxc_conf->rootfs.path)) { |
8c39f7a4 SH |
2877 | ERROR("Snapshot of directory-backed container requested."); |
2878 | ERROR("Making a copy-clone. If you do want snapshots, then"); | |
1f92162d | 2879 | ERROR("please create an aufs or overlayfs clone first, snapshot that"); |
8c39f7a4 SH |
2880 | ERROR("and keep the original container pristine."); |
2881 | flags &= ~LXC_CLONE_SNAPSHOT | LXC_CLONE_MAYBE_SNAPSHOT; | |
2882 | } | |
f5dd1d53 SH |
2883 | c2 = c->clone(c, newname, snappath, flags, NULL, NULL, 0, NULL); |
2884 | if (!c2) { | |
959aee9c | 2885 | ERROR("clone of %s:%s failed", c->config_path, c->name); |
f5dd1d53 SH |
2886 | return -1; |
2887 | } | |
2888 | ||
2889 | lxc_container_put(c2); | |
2890 | ||
2891 | // Now write down the creation time | |
2892 | time_t timer; | |
2893 | char buffer[25]; | |
2894 | struct tm* tm_info; | |
025ed0f3 | 2895 | FILE *f; |
f5dd1d53 SH |
2896 | |
2897 | time(&timer); | |
2898 | tm_info = localtime(&timer); | |
2899 | ||
2900 | strftime(buffer, 25, "%Y:%m:%d %H:%M:%S", tm_info); | |
2901 | ||
2902 | char *dfnam = alloca(strlen(snappath) + strlen(newname) + 5); | |
2903 | sprintf(dfnam, "%s/%s/ts", snappath, newname); | |
025ed0f3 | 2904 | f = fopen(dfnam, "w"); |
f5dd1d53 | 2905 | if (!f) { |
959aee9c | 2906 | ERROR("Failed to open %s", dfnam); |
f5dd1d53 SH |
2907 | return -1; |
2908 | } | |
2909 | if (fprintf(f, "%s", buffer) < 0) { | |
2910 | SYSERROR("Writing timestamp"); | |
2911 | fclose(f); | |
2912 | return -1; | |
2913 | } | |
025ed0f3 | 2914 | ret = fclose(f); |
025ed0f3 | 2915 | if (ret != 0) { |
f5dd1d53 SH |
2916 | SYSERROR("Writing timestamp"); |
2917 | return -1; | |
2918 | } | |
2919 | ||
2920 | if (commentfile) { | |
2921 | // $p / $name / comment \0 | |
2922 | int len = strlen(snappath) + strlen(newname) + 10; | |
2923 | char *path = alloca(len); | |
2924 | sprintf(path, "%s/%s/comment", snappath, newname); | |
2925 | return copy_file(commentfile, path) < 0 ? -1 : i; | |
2926 | } | |
2927 | ||
2928 | return i; | |
2929 | } | |
2930 | ||
2931 | static void lxcsnap_free(struct lxc_snapshot *s) | |
2932 | { | |
2933 | if (s->name) | |
2934 | free(s->name); | |
2935 | if (s->comment_pathname) | |
2936 | free(s->comment_pathname); | |
2937 | if (s->timestamp) | |
2938 | free(s->timestamp); | |
2939 | if (s->lxcpath) | |
2940 | free(s->lxcpath); | |
2941 | } | |
2942 | ||
2943 | static char *get_snapcomment_path(char* snappath, char *name) | |
2944 | { | |
2945 | // $snappath/$name/comment | |
2946 | int ret, len = strlen(snappath) + strlen(name) + 10; | |
2947 | char *s = malloc(len); | |
2948 | ||
2949 | if (s) { | |
2950 | ret = snprintf(s, len, "%s/%s/comment", snappath, name); | |
2951 | if (ret < 0 || ret >= len) { | |
2952 | free(s); | |
2953 | s = NULL; | |
2954 | } | |
2955 | } | |
2956 | return s; | |
2957 | } | |
2958 | ||
2959 | static char *get_timestamp(char* snappath, char *name) | |
2960 | { | |
2961 | char path[MAXPATHLEN], *s = NULL; | |
2962 | int ret, len; | |
2963 | FILE *fin; | |
2964 | ||
2965 | ret = snprintf(path, MAXPATHLEN, "%s/%s/ts", snappath, name); | |
2966 | if (ret < 0 || ret >= MAXPATHLEN) | |
2967 | return NULL; | |
025ed0f3 | 2968 | fin = fopen(path, "r"); |
025ed0f3 | 2969 | if (!fin) |
f5dd1d53 SH |
2970 | return NULL; |
2971 | (void) fseek(fin, 0, SEEK_END); | |
2972 | len = ftell(fin); | |
2973 | (void) fseek(fin, 0, SEEK_SET); | |
2974 | if (len > 0) { | |
2975 | s = malloc(len+1); | |
2976 | if (s) { | |
2977 | s[len] = '\0'; | |
2978 | if (fread(s, 1, len, fin) != len) { | |
2979 | SYSERROR("reading timestamp"); | |
2980 | free(s); | |
2981 | s = NULL; | |
2982 | } | |
2983 | } | |
2984 | } | |
2985 | fclose(fin); | |
2986 | return s; | |
2987 | } | |
2988 | ||
2989 | static int lxcapi_snapshot_list(struct lxc_container *c, struct lxc_snapshot **ret_snaps) | |
2990 | { | |
2991 | char snappath[MAXPATHLEN], path2[MAXPATHLEN]; | |
f79b86a3 | 2992 | int dirlen, count = 0, ret; |
f5dd1d53 SH |
2993 | struct dirent dirent, *direntp; |
2994 | struct lxc_snapshot *snaps =NULL, *nsnaps; | |
2995 | DIR *dir; | |
2996 | ||
2997 | if (!c || !lxcapi_is_defined(c)) | |
2998 | return -1; | |
c868b261 | 2999 | |
f79b86a3 SH |
3000 | // snappath is ${lxcpath}snaps/${lxcname}/ |
3001 | dirlen = snprintf(snappath, MAXPATHLEN, "%ssnaps/%s", c->config_path, c->name); | |
3002 | if (dirlen < 0 || dirlen >= MAXPATHLEN) { | |
f5dd1d53 SH |
3003 | ERROR("path name too long"); |
3004 | return -1; | |
3005 | } | |
025ed0f3 | 3006 | dir = opendir(snappath); |
025ed0f3 | 3007 | if (!dir) { |
f5dd1d53 SH |
3008 | INFO("failed to open %s - assuming no snapshots", snappath); |
3009 | return 0; | |
3010 | } | |
3011 | ||
3012 | while (!readdir_r(dir, &dirent, &direntp)) { | |
3013 | if (!direntp) | |
3014 | break; | |
3015 | ||
3016 | if (!strcmp(direntp->d_name, ".")) | |
3017 | continue; | |
3018 | ||
3019 | if (!strcmp(direntp->d_name, "..")) | |
3020 | continue; | |
3021 | ||
3022 | ret = snprintf(path2, MAXPATHLEN, "%s/%s/config", snappath, direntp->d_name); | |
3023 | if (ret < 0 || ret >= MAXPATHLEN) { | |
3024 | ERROR("pathname too long"); | |
3025 | goto out_free; | |
3026 | } | |
3027 | if (!file_exists(path2)) | |
3028 | continue; | |
3029 | nsnaps = realloc(snaps, (count + 1)*sizeof(*snaps)); | |
3030 | if (!nsnaps) { | |
3031 | SYSERROR("Out of memory"); | |
3032 | goto out_free; | |
3033 | } | |
3034 | snaps = nsnaps; | |
3035 | snaps[count].free = lxcsnap_free; | |
3036 | snaps[count].name = strdup(direntp->d_name); | |
3037 | if (!snaps[count].name) | |
3038 | goto out_free; | |
3039 | snaps[count].lxcpath = strdup(snappath); | |
3040 | if (!snaps[count].lxcpath) { | |
3041 | free(snaps[count].name); | |
3042 | goto out_free; | |
3043 | } | |
3044 | snaps[count].comment_pathname = get_snapcomment_path(snappath, direntp->d_name); | |
3045 | snaps[count].timestamp = get_timestamp(snappath, direntp->d_name); | |
3046 | count++; | |
3047 | } | |
3048 | ||
3049 | if (closedir(dir)) | |
3050 | WARN("failed to close directory"); | |
3051 | ||
3052 | *ret_snaps = snaps; | |
3053 | return count; | |
3054 | ||
3055 | out_free: | |
3056 | if (snaps) { | |
3057 | int i; | |
3058 | for (i=0; i<count; i++) | |
3059 | lxcsnap_free(&snaps[i]); | |
3060 | free(snaps); | |
3061 | } | |
9baa57bd SH |
3062 | if (closedir(dir)) |
3063 | WARN("failed to close directory"); | |
f5dd1d53 SH |
3064 | return -1; |
3065 | } | |
3066 | ||
f0ca2726 | 3067 | static bool lxcapi_snapshot_restore(struct lxc_container *c, const char *snapname, const char *newname) |
f5dd1d53 SH |
3068 | { |
3069 | char clonelxcpath[MAXPATHLEN]; | |
f79b86a3 | 3070 | int flags = 0,ret; |
f5dd1d53 SH |
3071 | struct lxc_container *snap, *rest; |
3072 | struct bdev *bdev; | |
3073 | bool b = false; | |
3074 | ||
3075 | if (!c || !c->name || !c->config_path) | |
3076 | return false; | |
3077 | ||
76a26f55 | 3078 | bdev = bdev_init(c->lxc_conf, c->lxc_conf->rootfs.path, c->lxc_conf->rootfs.mount, NULL); |
f5dd1d53 SH |
3079 | if (!bdev) { |
3080 | ERROR("Failed to find original backing store type"); | |
3081 | return false; | |
3082 | } | |
3083 | ||
3084 | if (!newname) | |
3085 | newname = c->name; | |
3086 | if (strcmp(c->name, newname) == 0) { | |
3087 | if (!lxcapi_destroy(c)) { | |
3088 | ERROR("Could not destroy existing container %s", newname); | |
3089 | bdev_put(bdev); | |
3090 | return false; | |
3091 | } | |
3092 | } | |
f79b86a3 SH |
3093 | ret = snprintf(clonelxcpath, MAXPATHLEN, "%ssnaps/%s", c->config_path, c->name); |
3094 | if (ret < 0 || ret >= MAXPATHLEN) { | |
f5dd1d53 SH |
3095 | bdev_put(bdev); |
3096 | return false; | |
3097 | } | |
3098 | // how should we lock this? | |
3099 | ||
3100 | snap = lxc_container_new(snapname, clonelxcpath); | |
3101 | if (!snap || !lxcapi_is_defined(snap)) { | |
3102 | ERROR("Could not open snapshot %s", snapname); | |
3103 | if (snap) lxc_container_put(snap); | |
3104 | bdev_put(bdev); | |
3105 | return false; | |
3106 | } | |
3107 | ||
de269ee8 SH |
3108 | if (strcmp(bdev->type, "dir") != 0 && strcmp(bdev->type, "loop") != 0) |
3109 | flags = LXC_CLONE_SNAPSHOT | LXC_CLONE_MAYBE_SNAPSHOT; | |
3110 | rest = lxcapi_clone(snap, newname, c->config_path, flags, | |
3111 | bdev->type, NULL, 0, NULL); | |
f5dd1d53 SH |
3112 | bdev_put(bdev); |
3113 | if (rest && lxcapi_is_defined(rest)) | |
3114 | b = true; | |
3115 | if (rest) | |
3116 | lxc_container_put(rest); | |
3117 | lxc_container_put(snap); | |
3118 | return b; | |
3119 | } | |
3120 | ||
f0ca2726 | 3121 | static bool lxcapi_snapshot_destroy(struct lxc_container *c, const char *snapname) |
771d96b3 ÇO |
3122 | { |
3123 | int ret; | |
3124 | char clonelxcpath[MAXPATHLEN]; | |
3125 | struct lxc_container *snap = NULL; | |
3126 | ||
3127 | if (!c || !c->name || !c->config_path) | |
3128 | return false; | |
3129 | ||
3130 | ret = snprintf(clonelxcpath, MAXPATHLEN, "%ssnaps/%s", c->config_path, c->name); | |
3131 | if (ret < 0 || ret >= MAXPATHLEN) | |
3132 | goto err; | |
3133 | ||
3134 | snap = lxc_container_new(snapname, clonelxcpath); | |
3135 | if (!snap || !lxcapi_is_defined(snap)) { | |
3136 | ERROR("Could not find snapshot %s", snapname); | |
3137 | goto err; | |
3138 | } | |
3139 | ||
3140 | if (!lxcapi_destroy(snap)) { | |
3141 | ERROR("Could not destroy snapshot %s", snapname); | |
3142 | goto err; | |
3143 | } | |
3144 | lxc_container_put(snap); | |
3145 | ||
3146 | return true; | |
3147 | err: | |
3148 | if (snap) | |
3149 | lxc_container_put(snap); | |
3150 | return false; | |
3151 | } | |
3152 | ||
b494d2dd SH |
3153 | static bool lxcapi_may_control(struct lxc_container *c) |
3154 | { | |
3155 | return lxc_try_cmd(c->name, c->config_path) == 0; | |
3156 | } | |
3157 | ||
d5aa23e6 SH |
3158 | static bool do_add_remove_node(pid_t init_pid, const char *path, bool add, |
3159 | struct stat *st) | |
3160 | { | |
3161 | char chrootpath[MAXPATHLEN]; | |
3162 | char *directory_path = NULL; | |
3163 | pid_t pid; | |
3164 | int ret; | |
3165 | ||
3166 | if ((pid = fork()) < 0) { | |
3167 | SYSERROR("failed to fork a child helper"); | |
3168 | return false; | |
3169 | } | |
3170 | if (pid) { | |
3171 | if (wait_for_pid(pid) != 0) { | |
3172 | ERROR("Failed to create note in guest"); | |
3173 | return false; | |
3174 | } | |
3175 | return true; | |
3176 | } | |
3177 | ||
3178 | /* prepare the path */ | |
3179 | ret = snprintf(chrootpath, MAXPATHLEN, "/proc/%d/root", init_pid); | |
3180 | if (ret < 0 || ret >= MAXPATHLEN) | |
3181 | return false; | |
3182 | ||
6b9324bd | 3183 | if (chroot(chrootpath) < 0) |
d5aa23e6 | 3184 | exit(1); |
6b9324bd | 3185 | if (chdir("/") < 0) |
d5aa23e6 SH |
3186 | exit(1); |
3187 | /* remove path if it exists */ | |
3188 | if(faccessat(AT_FDCWD, path, F_OK, AT_SYMLINK_NOFOLLOW) == 0) { | |
3189 | if (unlink(path) < 0) { | |
3190 | ERROR("unlink failed"); | |
3191 | exit(1); | |
3192 | } | |
3193 | } | |
3194 | if (!add) | |
3195 | exit(0); | |
3196 | ||
3197 | /* create any missing directories */ | |
3198 | directory_path = dirname(strdup(path)); | |
3199 | if (mkdir_p(directory_path, 0755) < 0 && errno != EEXIST) { | |
3200 | ERROR("failed to create directory"); | |
3201 | exit(1); | |
3202 | } | |
3203 | ||
3204 | /* create the device node */ | |
3205 | if (mknod(path, st->st_mode, st->st_rdev) < 0) { | |
3206 | ERROR("mknod failed"); | |
3207 | exit(1); | |
3208 | } | |
3209 | ||
3210 | exit(0); | |
3211 | } | |
3212 | ||
f0ca2726 | 3213 | static bool add_remove_device_node(struct lxc_container *c, const char *src_path, const char *dest_path, bool add) |
a9a0ed90 ÇO |
3214 | { |
3215 | int ret; | |
3216 | struct stat st; | |
a9a0ed90 | 3217 | char value[MAX_BUFFER]; |
f0ca2726 | 3218 | const char *p; |
a9a0ed90 ÇO |
3219 | |
3220 | /* make sure container is running */ | |
3221 | if (!c->is_running(c)) { | |
3222 | ERROR("container is not running"); | |
d5aa23e6 | 3223 | return false; |
a9a0ed90 ÇO |
3224 | } |
3225 | ||
3226 | /* use src_path if dest_path is NULL otherwise use dest_path */ | |
3227 | p = dest_path ? dest_path : src_path; | |
3228 | ||
a9a0ed90 ÇO |
3229 | /* make sure we can access p */ |
3230 | if(access(p, F_OK) < 0 || stat(p, &st) < 0) | |
d5aa23e6 | 3231 | return false; |
a9a0ed90 ÇO |
3232 | |
3233 | /* continue if path is character device or block device */ | |
c6a9b0d7 | 3234 | if (S_ISCHR(st.st_mode)) |
a9a0ed90 | 3235 | ret = snprintf(value, MAX_BUFFER, "c %d:%d rwm", major(st.st_rdev), minor(st.st_rdev)); |
c6a9b0d7 | 3236 | else if (S_ISBLK(st.st_mode)) |
a9a0ed90 ÇO |
3237 | ret = snprintf(value, MAX_BUFFER, "b %d:%d rwm", major(st.st_rdev), minor(st.st_rdev)); |
3238 | else | |
d5aa23e6 | 3239 | return false; |
a9a0ed90 ÇO |
3240 | |
3241 | /* check snprintf return code */ | |
3242 | if (ret < 0 || ret >= MAX_BUFFER) | |
d5aa23e6 | 3243 | return false; |
a9a0ed90 | 3244 | |
d5aa23e6 SH |
3245 | if (!do_add_remove_node(c->init_pid(c), p, add, &st)) |
3246 | return false; | |
a9a0ed90 | 3247 | |
d5aa23e6 | 3248 | /* add or remove device to/from cgroup access list */ |
a9a0ed90 | 3249 | if (add) { |
a9a0ed90 ÇO |
3250 | if (!c->set_cgroup_item(c, "devices.allow", value)) { |
3251 | ERROR("set_cgroup_item failed while adding the device node"); | |
d5aa23e6 | 3252 | return false; |
a9a0ed90 ÇO |
3253 | } |
3254 | } else { | |
a9a0ed90 ÇO |
3255 | if (!c->set_cgroup_item(c, "devices.deny", value)) { |
3256 | ERROR("set_cgroup_item failed while removing the device node"); | |
d5aa23e6 | 3257 | return false; |
a9a0ed90 ÇO |
3258 | } |
3259 | } | |
d5aa23e6 | 3260 | |
a9a0ed90 | 3261 | return true; |
a9a0ed90 ÇO |
3262 | } |
3263 | ||
f0ca2726 | 3264 | static bool lxcapi_add_device_node(struct lxc_container *c, const char *src_path, const char *dest_path) |
a9a0ed90 | 3265 | { |
c868b261 ÇO |
3266 | if (am_unpriv()) { |
3267 | ERROR(NOT_SUPPORTED_ERROR, __FUNCTION__); | |
3268 | return false; | |
3269 | } | |
a9a0ed90 ÇO |
3270 | return add_remove_device_node(c, src_path, dest_path, true); |
3271 | } | |
3272 | ||
f0ca2726 | 3273 | static bool lxcapi_remove_device_node(struct lxc_container *c, const char *src_path, const char *dest_path) |
a9a0ed90 | 3274 | { |
c868b261 ÇO |
3275 | if (am_unpriv()) { |
3276 | ERROR(NOT_SUPPORTED_ERROR, __FUNCTION__); | |
3277 | return false; | |
3278 | } | |
a9a0ed90 ÇO |
3279 | return add_remove_device_node(c, src_path, dest_path, false); |
3280 | } | |
3281 | ||
a0e93eeb CS |
3282 | static int lxcapi_attach_run_waitl(struct lxc_container *c, lxc_attach_options_t *options, const char *program, const char *arg, ...) |
3283 | { | |
3284 | va_list ap; | |
3285 | const char **argv; | |
3286 | int ret; | |
3287 | ||
3288 | if (!c) | |
3289 | return -1; | |
3290 | ||
3291 | va_start(ap, arg); | |
3292 | argv = lxc_va_arg_list_to_argv_const(ap, 1); | |
3293 | va_end(ap); | |
3294 | ||
3295 | if (!argv) { | |
3296 | ERROR("Memory allocation error."); | |
3297 | return -1; | |
3298 | } | |
3299 | argv[0] = arg; | |
3300 | ||
3301 | ret = lxcapi_attach_run_wait(c, options, program, (const char * const *)argv); | |
3302 | free((void*)argv); | |
3303 | return ret; | |
3304 | } | |
3305 | ||
afeecbba | 3306 | struct lxc_container *lxc_container_new(const char *name, const char *configpath) |
72d0e1cb SG |
3307 | { |
3308 | struct lxc_container *c; | |
72d0e1cb SG |
3309 | |
3310 | c = malloc(sizeof(*c)); | |
3311 | if (!c) { | |
3312 | fprintf(stderr, "failed to malloc lxc_container\n"); | |
3313 | return NULL; | |
3314 | } | |
3315 | memset(c, 0, sizeof(*c)); | |
3316 | ||
afeecbba SH |
3317 | if (configpath) |
3318 | c->config_path = strdup(configpath); | |
3319 | else | |
593e8478 | 3320 | c->config_path = strdup(lxc_global_config_value("lxc.lxcpath")); |
afeecbba | 3321 | |
2a59a681 | 3322 | if (!c->config_path) { |
03fadd16 | 3323 | fprintf(stderr, "Out of memory\n"); |
2a59a681 SH |
3324 | goto err; |
3325 | } | |
3326 | ||
f5dd1d53 | 3327 | remove_trailing_slashes(c->config_path); |
72d0e1cb SG |
3328 | c->name = malloc(strlen(name)+1); |
3329 | if (!c->name) { | |
3330 | fprintf(stderr, "Error allocating lxc_container name\n"); | |
3331 | goto err; | |
3332 | } | |
3333 | strcpy(c->name, name); | |
3334 | ||
3335 | c->numthreads = 1; | |
df271a59 | 3336 | if (!(c->slock = lxc_newlock(c->config_path, name))) { |
72d0e1cb SG |
3337 | fprintf(stderr, "failed to create lock\n"); |
3338 | goto err; | |
3339 | } | |
3340 | ||
df271a59 | 3341 | if (!(c->privlock = lxc_newlock(NULL, NULL))) { |
72d0e1cb SG |
3342 | fprintf(stderr, "failed to alloc privlock\n"); |
3343 | goto err; | |
3344 | } | |
3345 | ||
afeecbba | 3346 | if (!set_config_filename(c)) { |
72d0e1cb SG |
3347 | fprintf(stderr, "Error allocating config file pathname\n"); |
3348 | goto err; | |
3349 | } | |
72d0e1cb | 3350 | |
bac806d1 SH |
3351 | if (file_exists(c->configfile) && !lxcapi_load_config(c, NULL)) |
3352 | goto err; | |
72d0e1cb | 3353 | |
3e625e2d SH |
3354 | if (ongoing_create(c) == 2) { |
3355 | ERROR("Error: %s creation was not completed", c->name); | |
1897e3bc | 3356 | lxcapi_destroy(c); |
4df7f012 | 3357 | lxcapi_clear_config(c); |
3e625e2d | 3358 | } |
c8ad5f46 | 3359 | c->daemonize = true; |
72cf75fa | 3360 | c->pidfile = NULL; |
3e625e2d | 3361 | |
72d0e1cb SG |
3362 | // assign the member functions |
3363 | c->is_defined = lxcapi_is_defined; | |
3364 | c->state = lxcapi_state; | |
3365 | c->is_running = lxcapi_is_running; | |
3366 | c->freeze = lxcapi_freeze; | |
3367 | c->unfreeze = lxcapi_unfreeze; | |
0115f8fd | 3368 | c->console = lxcapi_console; |
b5159817 | 3369 | c->console_getfd = lxcapi_console_getfd; |
72d0e1cb SG |
3370 | c->init_pid = lxcapi_init_pid; |
3371 | c->load_config = lxcapi_load_config; | |
3372 | c->want_daemonize = lxcapi_want_daemonize; | |
130a1888 | 3373 | c->want_close_all_fds = lxcapi_want_close_all_fds; |
72d0e1cb SG |
3374 | c->start = lxcapi_start; |
3375 | c->startl = lxcapi_startl; | |
3376 | c->stop = lxcapi_stop; | |
3377 | c->config_file_name = lxcapi_config_file_name; | |
3378 | c->wait = lxcapi_wait; | |
3379 | c->set_config_item = lxcapi_set_config_item; | |
3380 | c->destroy = lxcapi_destroy; | |
06e5650e | 3381 | c->rename = lxcapi_rename; |
72d0e1cb SG |
3382 | c->save_config = lxcapi_save_config; |
3383 | c->get_keys = lxcapi_get_keys; | |
3384 | c->create = lxcapi_create; | |
3385 | c->createl = lxcapi_createl; | |
3386 | c->shutdown = lxcapi_shutdown; | |
3e625e2d | 3387 | c->reboot = lxcapi_reboot; |
4df7f012 | 3388 | c->clear_config = lxcapi_clear_config; |
72d0e1cb SG |
3389 | c->clear_config_item = lxcapi_clear_config_item; |
3390 | c->get_config_item = lxcapi_get_config_item; | |
8ac18377 | 3391 | c->get_running_config_item = lxcapi_get_running_config_item; |
794dd120 SH |
3392 | c->get_cgroup_item = lxcapi_get_cgroup_item; |
3393 | c->set_cgroup_item = lxcapi_set_cgroup_item; | |
2a59a681 SH |
3394 | c->get_config_path = lxcapi_get_config_path; |
3395 | c->set_config_path = lxcapi_set_config_path; | |
9be53773 | 3396 | c->clone = lxcapi_clone; |
799f29ab | 3397 | c->get_interfaces = lxcapi_get_interfaces; |
9c83a661 | 3398 | c->get_ips = lxcapi_get_ips; |
a0e93eeb CS |
3399 | c->attach = lxcapi_attach; |
3400 | c->attach_run_wait = lxcapi_attach_run_wait; | |
3401 | c->attach_run_waitl = lxcapi_attach_run_waitl; | |
f5dd1d53 SH |
3402 | c->snapshot = lxcapi_snapshot; |
3403 | c->snapshot_list = lxcapi_snapshot_list; | |
3404 | c->snapshot_restore = lxcapi_snapshot_restore; | |
771d96b3 | 3405 | c->snapshot_destroy = lxcapi_snapshot_destroy; |
b494d2dd | 3406 | c->may_control = lxcapi_may_control; |
a9a0ed90 ÇO |
3407 | c->add_device_node = lxcapi_add_device_node; |
3408 | c->remove_device_node = lxcapi_remove_device_node; | |
72d0e1cb SG |
3409 | |
3410 | /* we'll allow the caller to update these later */ | |
ab1bf971 | 3411 | if (lxc_log_init(NULL, "none", NULL, "lxc_container", 0, c->config_path)) { |
72d0e1cb SG |
3412 | fprintf(stderr, "failed to open log\n"); |
3413 | goto err; | |
3414 | } | |
3415 | ||
72d0e1cb SG |
3416 | return c; |
3417 | ||
3418 | err: | |
3419 | lxc_container_free(c); | |
3420 | return NULL; | |
3421 | } | |
3422 | ||
4a7c7daa | 3423 | int lxc_get_wait_states(const char **states) |
72d0e1cb SG |
3424 | { |
3425 | int i; | |
3426 | ||
3427 | if (states) | |
3428 | for (i=0; i<MAX_STATE; i++) | |
3429 | states[i] = lxc_state2str(i); | |
3430 | return MAX_STATE; | |
3431 | } | |
a41f104b | 3432 | |
a41f104b SH |
3433 | /* |
3434 | * These next two could probably be done smarter with reusing a common function | |
3435 | * with different iterators and tests... | |
3436 | */ | |
3437 | int list_defined_containers(const char *lxcpath, char ***names, struct lxc_container ***cret) | |
3438 | { | |
3439 | DIR *dir; | |
3440 | int i, cfound = 0, nfound = 0; | |
3441 | struct dirent dirent, *direntp; | |
3442 | struct lxc_container *c; | |
3443 | ||
3444 | if (!lxcpath) | |
593e8478 | 3445 | lxcpath = lxc_global_config_value("lxc.lxcpath"); |
a41f104b | 3446 | |
a41f104b | 3447 | dir = opendir(lxcpath); |
a41f104b SH |
3448 | if (!dir) { |
3449 | SYSERROR("opendir on lxcpath"); | |
3450 | return -1; | |
3451 | } | |
3452 | ||
3453 | if (cret) | |
3454 | *cret = NULL; | |
3455 | if (names) | |
3456 | *names = NULL; | |
3457 | ||
3458 | while (!readdir_r(dir, &dirent, &direntp)) { | |
3459 | if (!direntp) | |
3460 | break; | |
3461 | if (!strcmp(direntp->d_name, ".")) | |
3462 | continue; | |
3463 | if (!strcmp(direntp->d_name, "..")) | |
3464 | continue; | |
3465 | ||
3466 | if (!config_file_exists(lxcpath, direntp->d_name)) | |
3467 | continue; | |
3468 | ||
3469 | if (names) { | |
9c88ff1f | 3470 | if (!add_to_array(names, direntp->d_name, cfound)) |
a41f104b SH |
3471 | goto free_bad; |
3472 | } | |
3473 | cfound++; | |
3474 | ||
3475 | if (!cret) { | |
3476 | nfound++; | |
3477 | continue; | |
3478 | } | |
3479 | ||
3480 | c = lxc_container_new(direntp->d_name, lxcpath); | |
3481 | if (!c) { | |
3482 | INFO("Container %s:%s has a config but could not be loaded", | |
3483 | lxcpath, direntp->d_name); | |
3484 | if (names) | |
9c88ff1f ÇO |
3485 | if(!remove_from_array(names, direntp->d_name, cfound--)) |
3486 | goto free_bad; | |
a41f104b SH |
3487 | continue; |
3488 | } | |
3489 | if (!lxcapi_is_defined(c)) { | |
3490 | INFO("Container %s:%s has a config but is not defined", | |
3491 | lxcpath, direntp->d_name); | |
3492 | if (names) | |
9c88ff1f ÇO |
3493 | if(!remove_from_array(names, direntp->d_name, cfound--)) |
3494 | goto free_bad; | |
a41f104b SH |
3495 | lxc_container_put(c); |
3496 | continue; | |
3497 | } | |
3498 | ||
2871830a | 3499 | if (!add_to_clist(cret, c, nfound, true)) { |
a41f104b SH |
3500 | lxc_container_put(c); |
3501 | goto free_bad; | |
3502 | } | |
3503 | nfound++; | |
3504 | } | |
3505 | ||
a41f104b | 3506 | closedir(dir); |
a41f104b SH |
3507 | return nfound; |
3508 | ||
3509 | free_bad: | |
3510 | if (names && *names) { | |
3511 | for (i=0; i<cfound; i++) | |
3512 | free((*names)[i]); | |
3513 | free(*names); | |
3514 | } | |
3515 | if (cret && *cret) { | |
3516 | for (i=0; i<nfound; i++) | |
3517 | lxc_container_put((*cret)[i]); | |
3518 | free(*cret); | |
3519 | } | |
a41f104b | 3520 | closedir(dir); |
a41f104b SH |
3521 | return -1; |
3522 | } | |
3523 | ||
148a9d27 DE |
3524 | int list_active_containers(const char *lxcpath, char ***nret, |
3525 | struct lxc_container ***cret) | |
a41f104b | 3526 | { |
148a9d27 | 3527 | int i, ret = -1, cret_cnt = 0, ct_name_cnt = 0; |
a41f104b SH |
3528 | int lxcpath_len; |
3529 | char *line = NULL; | |
148a9d27 | 3530 | char **ct_name = NULL; |
a41f104b SH |
3531 | size_t len = 0; |
3532 | struct lxc_container *c; | |
3533 | ||
3534 | if (!lxcpath) | |
593e8478 | 3535 | lxcpath = lxc_global_config_value("lxc.lxcpath"); |
a41f104b SH |
3536 | lxcpath_len = strlen(lxcpath); |
3537 | ||
3538 | if (cret) | |
3539 | *cret = NULL; | |
148a9d27 DE |
3540 | if (nret) |
3541 | *nret = NULL; | |
a41f104b | 3542 | |
a41f104b | 3543 | FILE *f = fopen("/proc/net/unix", "r"); |
a41f104b SH |
3544 | if (!f) |
3545 | return -1; | |
3546 | ||
3547 | while (getline(&line, &len, f) != -1) { | |
0f8f9c8a | 3548 | char *p = strrchr(line, ' '), *p2; |
a41f104b SH |
3549 | if (!p) |
3550 | continue; | |
3551 | p++; | |
3552 | if (*p != 0x40) | |
3553 | continue; | |
3554 | p++; | |
3555 | if (strncmp(p, lxcpath, lxcpath_len) != 0) | |
3556 | continue; | |
3557 | p += lxcpath_len; | |
3558 | while (*p == '/') | |
3559 | p++; | |
3560 | ||
3561 | // Now p is the start of lxc_name | |
3562 | p2 = index(p, '/'); | |
3563 | if (!p2 || strncmp(p2, "/command", 8) != 0) | |
3564 | continue; | |
3565 | *p2 = '\0'; | |
3566 | ||
148a9d27 | 3567 | if (array_contains(&ct_name, p, ct_name_cnt)) |
9c88ff1f ÇO |
3568 | continue; |
3569 | ||
148a9d27 DE |
3570 | if (!add_to_array(&ct_name, p, ct_name_cnt)) |
3571 | goto free_cret_list; | |
9c88ff1f | 3572 | |
148a9d27 | 3573 | ct_name_cnt++; |
a41f104b | 3574 | |
148a9d27 | 3575 | if (!cret) |
a41f104b | 3576 | continue; |
a41f104b SH |
3577 | |
3578 | c = lxc_container_new(p, lxcpath); | |
3579 | if (!c) { | |
3580 | INFO("Container %s:%s is running but could not be loaded", | |
3581 | lxcpath, p); | |
148a9d27 | 3582 | remove_from_array(&ct_name, p, ct_name_cnt--); |
a41f104b SH |
3583 | continue; |
3584 | } | |
3585 | ||
3586 | /* | |
3587 | * If this is an anonymous container, then is_defined *can* | |
3588 | * return false. So we don't do that check. Count on the | |
3589 | * fact that the command socket exists. | |
3590 | */ | |
3591 | ||
148a9d27 | 3592 | if (!add_to_clist(cret, c, cret_cnt, true)) { |
a41f104b | 3593 | lxc_container_put(c); |
148a9d27 | 3594 | goto free_cret_list; |
a41f104b | 3595 | } |
148a9d27 | 3596 | cret_cnt++; |
a41f104b SH |
3597 | } |
3598 | ||
148a9d27 DE |
3599 | assert(!nret || !cret || cret_cnt == ct_name_cnt); |
3600 | ret = ct_name_cnt; | |
3601 | if (nret) | |
3602 | *nret = ct_name; | |
3603 | else | |
3604 | goto free_ct_name; | |
3605 | goto out; | |
a41f104b | 3606 | |
148a9d27 | 3607 | free_cret_list: |
a41f104b | 3608 | if (cret && *cret) { |
148a9d27 | 3609 | for (i = 0; i < cret_cnt; i++) |
a41f104b SH |
3610 | lxc_container_put((*cret)[i]); |
3611 | free(*cret); | |
3612 | } | |
148a9d27 DE |
3613 | |
3614 | free_ct_name: | |
3615 | if (ct_name) { | |
3616 | for (i = 0; i < ct_name_cnt; i++) | |
3617 | free(ct_name[i]); | |
3618 | free(ct_name); | |
3619 | } | |
3620 | ||
3621 | out: | |
e853a32d ÇO |
3622 | if (line) |
3623 | free(line); | |
3624 | ||
a41f104b | 3625 | fclose(f); |
148a9d27 | 3626 | return ret; |
a41f104b | 3627 | } |
2871830a DE |
3628 | |
3629 | int list_all_containers(const char *lxcpath, char ***nret, | |
3630 | struct lxc_container ***cret) | |
3631 | { | |
3632 | int i, ret, active_cnt, ct_cnt, ct_list_cnt; | |
3633 | char **active_name; | |
3634 | char **ct_name; | |
3635 | struct lxc_container **ct_list = NULL; | |
3636 | ||
3637 | ct_cnt = list_defined_containers(lxcpath, &ct_name, NULL); | |
3638 | if (ct_cnt < 0) | |
3639 | return ct_cnt; | |
3640 | ||
3641 | active_cnt = list_active_containers(lxcpath, &active_name, NULL); | |
3642 | if (active_cnt < 0) { | |
3643 | ret = active_cnt; | |
3644 | goto free_ct_name; | |
3645 | } | |
3646 | ||
3647 | for (i = 0; i < active_cnt; i++) { | |
3648 | if (!array_contains(&ct_name, active_name[i], ct_cnt)) { | |
3649 | if (!add_to_array(&ct_name, active_name[i], ct_cnt)) { | |
3650 | ret = -1; | |
3651 | goto free_active_name; | |
3652 | } | |
3653 | ct_cnt++; | |
3654 | } | |
3655 | free(active_name[i]); | |
3656 | active_name[i] = NULL; | |
3657 | } | |
3658 | free(active_name); | |
3659 | active_name = NULL; | |
3660 | active_cnt = 0; | |
3661 | ||
3662 | for (i = 0, ct_list_cnt = 0; i < ct_cnt && cret; i++) { | |
3663 | struct lxc_container *c; | |
3664 | ||
3665 | c = lxc_container_new(ct_name[i], lxcpath); | |
3666 | if (!c) { | |
3667 | WARN("Container %s:%s could not be loaded", lxcpath, ct_name[i]); | |
3668 | remove_from_array(&ct_name, ct_name[i], ct_cnt--); | |
3669 | continue; | |
3670 | } | |
3671 | ||
3672 | if (!add_to_clist(&ct_list, c, ct_list_cnt, false)) { | |
3673 | lxc_container_put(c); | |
3674 | ret = -1; | |
3675 | goto free_ct_list; | |
3676 | } | |
3677 | ct_list_cnt++; | |
3678 | } | |
3679 | ||
3680 | if (cret) | |
3681 | *cret = ct_list; | |
3682 | ||
3683 | if (nret) | |
3684 | *nret = ct_name; | |
3685 | else { | |
3686 | ret = ct_cnt; | |
3687 | goto free_ct_name; | |
3688 | } | |
3689 | return ct_cnt; | |
3690 | ||
3691 | free_ct_list: | |
3692 | for (i = 0; i < ct_list_cnt; i++) { | |
3693 | lxc_container_put(ct_list[i]); | |
3694 | } | |
3695 | if (ct_list) | |
3696 | free(ct_list); | |
3697 | ||
3698 | free_active_name: | |
3699 | for (i = 0; i < active_cnt; i++) { | |
3700 | if (active_name[i]) | |
3701 | free(active_name[i]); | |
3702 | } | |
3703 | if (active_name) | |
3704 | free(active_name); | |
3705 | ||
3706 | free_ct_name: | |
3707 | for (i = 0; i < ct_cnt; i++) { | |
3708 | free(ct_name[i]); | |
3709 | } | |
3710 | free(ct_name); | |
3711 | return ret; | |
3712 | } |