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1 /* liblxcapi
2 *
3 * Copyright © 2012 Serge Hallyn <serge.hallyn@ubuntu.com>.
4 * Copyright © 2012 Canonical Ltd.
5 *
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
19 */
20
21 #define _GNU_SOURCE
22 #include <arpa/inet.h>
23 #include <dirent.h>
24 #include <errno.h>
25 #include <fcntl.h>
26 #include <grp.h>
27 #include <libgen.h>
28 #include <pthread.h>
29 #include <sched.h>
30 #include <stdarg.h>
31 #include <stdint.h>
32 #include <stdio.h>
33 #include <sys/file.h>
34 #include <sys/mman.h>
35 #include <sys/mount.h>
36 #include <sys/syscall.h>
37 #include <sys/sysmacros.h>
38 #include <sys/types.h>
39 #include <sys/wait.h>
40 #include <unistd.h>
41
42 #include "af_unix.h"
43 #include "attach.h"
44 #include "cgroup.h"
45 #include "commands.h"
46 #include "commands_utils.h"
47 #include "conf.h"
48 #include "config.h"
49 #include "confile.h"
50 #include "confile_utils.h"
51 #include "criu.h"
52 #include "error.h"
53 #include "initutils.h"
54 #include "log.h"
55 #include "lxc.h"
56 #include "lxccontainer.h"
57 #include "lxclock.h"
58 #include "monitor.h"
59 #include "namespace.h"
60 #include "network.h"
61 #include "parse.h"
62 #include "start.h"
63 #include "state.h"
64 #include "storage.h"
65 #include "storage/btrfs.h"
66 #include "storage/overlay.h"
67 #include "storage_utils.h"
68 #include "sync.h"
69 #include "terminal.h"
70 #include "utils.h"
71 #include "version.h"
72
73 /* major()/minor() */
74 #ifdef MAJOR_IN_MKDEV
75 #include <sys/mkdev.h>
76 #endif
77
78 #if HAVE_IFADDRS_H
79 #include <ifaddrs.h>
80 #else
81 #include <../include/ifaddrs.h>
82 #endif
83
84 #if IS_BIONIC
85 #include <../include/lxcmntent.h>
86 #else
87 #include <mntent.h>
88 #endif
89
90 #ifndef HAVE_STRLCPY
91 #include "include/strlcpy.h"
92 #endif
93
94 /* Define faccessat() if missing from the C library */
95 #ifndef HAVE_FACCESSAT
96 static int faccessat(int __fd, const char *__file, int __type, int __flag)
97 {
98 #ifdef __NR_faccessat
99 return syscall(__NR_faccessat, __fd, __file, __type, __flag);
100 #else
101 errno = ENOSYS;
102 return -1;
103 #endif
104 }
105 #endif
106
107 lxc_log_define(lxc_container, lxc);
108
109 static bool do_lxcapi_destroy(struct lxc_container *c);
110 static const char *lxcapi_get_config_path(struct lxc_container *c);
111 #define do_lxcapi_get_config_path(c) lxcapi_get_config_path(c)
112 static bool do_lxcapi_set_config_item(struct lxc_container *c, const char *key, const char *v);
113 static bool container_destroy(struct lxc_container *c,
114 struct lxc_storage *storage);
115 static bool get_snappath_dir(struct lxc_container *c, char *snappath);
116 static bool lxcapi_snapshot_destroy_all(struct lxc_container *c);
117 static bool do_lxcapi_save_config(struct lxc_container *c, const char *alt_file);
118
119 static bool config_file_exists(const char *lxcpath, const char *cname)
120 {
121 int ret;
122 size_t len;
123 char *fname;
124
125 /* $lxcpath + '/' + $cname + '/config' + \0 */
126 len = strlen(lxcpath) + strlen(cname) + 9;
127 fname = alloca(len);
128 ret = snprintf(fname, len, "%s/%s/config", lxcpath, cname);
129 if (ret < 0 || (size_t)ret >= len)
130 return false;
131
132 return file_exists(fname);
133 }
134
135 /* A few functions to help detect when a container creation failed. If a
136 * container creation was killed partway through, then trying to actually start
137 * that container could harm the host. We detect this by creating a 'partial'
138 * file under the container directory, and keeping an advisory lock. When
139 * container creation completes, we remove that file. When we load or try to
140 * start a container, if we find that file, without a flock, we remove the
141 * container.
142 */
143 static int ongoing_create(struct lxc_container *c)
144 {
145 int fd, ret;
146 size_t len;
147 char *path;
148 struct flock lk = {0};
149
150 len = strlen(c->config_path) + strlen(c->name) + 10;
151 path = alloca(len);
152 ret = snprintf(path, len, "%s/%s/partial", c->config_path, c->name);
153 if (ret < 0 || (size_t)ret >= len)
154 return -1;
155
156 if (!file_exists(path))
157 return 0;
158
159 fd = open(path, O_RDWR);
160 if (fd < 0)
161 return 0;
162
163 lk.l_type = F_WRLCK;
164 lk.l_whence = SEEK_SET;
165 lk.l_pid = -1;
166
167 ret = fcntl(fd, F_OFD_GETLK, &lk);
168 if (ret < 0 && errno == EINVAL)
169 ret = flock(fd, LOCK_EX | LOCK_NB);
170 close(fd);
171 if (ret == 0 && lk.l_pid != -1) {
172 /* create is still ongoing */
173 return 1;
174 }
175
176 /* Create completed but partial is still there. */
177 return 2;
178 }
179
180 static int create_partial(struct lxc_container *c)
181 {
182 int fd, ret;
183 size_t len;
184 char *path;
185 struct flock lk = {0};
186
187 /* $lxcpath + '/' + $name + '/partial' + \0 */
188 len = strlen(c->config_path) + strlen(c->name) + 10;
189 path = alloca(len);
190 ret = snprintf(path, len, "%s/%s/partial", c->config_path, c->name);
191 if (ret < 0 || (size_t)ret >= len)
192 return -1;
193
194 fd = open(path, O_RDWR | O_CREAT | O_EXCL, 0755);
195 if (fd < 0)
196 return -1;
197
198 lk.l_type = F_WRLCK;
199 lk.l_whence = SEEK_SET;
200
201 ret = fcntl(fd, F_OFD_SETLKW, &lk);
202 if (ret < 0) {
203 if (errno == EINVAL) {
204 ret = flock(fd, LOCK_EX);
205 if (ret == 0)
206 return fd;
207 }
208
209 SYSERROR("Failed to lock partial file %s", path);
210 close(fd);
211 return -1;
212 }
213
214 return fd;
215 }
216
217 static void remove_partial(struct lxc_container *c, int fd)
218 {
219 int ret;
220 size_t len;
221 char *path;
222
223 close(fd);
224 /* $lxcpath + '/' + $name + '/partial' + \0 */
225 len = strlen(c->config_path) + strlen(c->name) + 10;
226 path = alloca(len);
227 ret = snprintf(path, len, "%s/%s/partial", c->config_path, c->name);
228 if (ret < 0 || (size_t)ret >= len)
229 return;
230
231 ret = unlink(path);
232 if (ret < 0)
233 SYSERROR("Failed to remove partial file %s", path);
234 }
235
236 /* LOCKING
237 * 1. container_mem_lock(c) protects the struct lxc_container from multiple threads.
238 * 2. container_disk_lock(c) protects the on-disk container data - in particular the
239 * container configuration file.
240 * The container_disk_lock also takes the container_mem_lock.
241 * 3. thread_mutex protects process data (ex: fd table) from multiple threads.
242 * NOTHING mutexes two independent programs with their own struct
243 * lxc_container for the same c->name, between API calls. For instance,
244 * c->config_read(); c->start(); Between those calls, data on disk
245 * could change (which shouldn't bother the caller unless for instance
246 * the rootfs get moved). c->config_read(); update; c->config_write();
247 * Two such updaters could race. The callers should therefore check their
248 * results. Trying to prevent that would necessarily expose us to deadlocks
249 * due to hung callers. So I prefer to keep the locks only within our own
250 * functions, not across functions.
251 *
252 * If you're going to clone while holding a lxccontainer, increment
253 * c->numthreads (under privlock) before forking. When deleting,
254 * decrement numthreads under privlock, then if it hits 0 you can delete.
255 * Do not ever use a lxccontainer whose numthreads you did not bump.
256 */
257
258 static void lxc_container_free(struct lxc_container *c)
259 {
260 if (!c)
261 return;
262
263 free(c->configfile);
264 c->configfile = NULL;
265
266 free(c->error_string);
267 c->error_string = NULL;
268
269 if (c->slock) {
270 lxc_putlock(c->slock);
271 c->slock = NULL;
272 }
273
274 if (c->privlock) {
275 lxc_putlock(c->privlock);
276 c->privlock = NULL;
277 }
278
279 free(c->name);
280 c->name = NULL;
281
282 if (c->lxc_conf) {
283 lxc_conf_free(c->lxc_conf);
284 c->lxc_conf = NULL;
285 }
286
287 free(c->config_path);
288 c->config_path = NULL;
289
290 free(c);
291 }
292
293 /* Consider the following case:
294 *
295 * |====================================================================|
296 * | freer | racing get()er |
297 * |====================================================================|
298 * | lxc_container_put() | lxc_container_get() |
299 * | \ lxclock(c->privlock) | c->numthreads < 1? (no) |
300 * | \ c->numthreads = 0 | \ lxclock(c->privlock) -> waits |
301 * | \ lxcunlock() | \ |
302 * | \ lxc_container_free() | \ lxclock() returns |
303 * | | \ c->numthreads < 1 -> return 0 |
304 * | \ \ (free stuff) | |
305 * | \ \ sem_destroy(privlock) | |
306 * |_______________________________|____________________________________|
307 *
308 * When the get()er checks numthreads the first time, one of the following
309 * is true:
310 * 1. freer has set numthreads = 0. get() returns 0
311 * 2. freer is between lxclock and setting numthreads to 0. get()er will
312 * sem_wait on privlock, get lxclock after freer() drops it, then see
313 * numthreads is 0 and exit without touching lxclock again..
314 * 3. freer has not yet locked privlock. If get()er runs first, then put()er
315 * will see --numthreads = 1 and not call lxc_container_free().
316 */
317
318 int lxc_container_get(struct lxc_container *c)
319 {
320 if (!c)
321 return 0;
322
323 /* If someone else has already started freeing the container, don't try
324 * to take the lock, which may be invalid.
325 */
326 if (c->numthreads < 1)
327 return 0;
328
329 if (container_mem_lock(c))
330 return 0;
331
332 /* Bail without trying to unlock, bc the privlock is now probably in
333 * freed memory.
334 */
335 if (c->numthreads < 1)
336 return 0;
337
338 c->numthreads++;
339 container_mem_unlock(c);
340
341 return 1;
342 }
343
344 int lxc_container_put(struct lxc_container *c)
345 {
346 if (!c)
347 return -1;
348
349 if (container_mem_lock(c))
350 return -1;
351
352 c->numthreads--;
353
354 if (c->numthreads < 1) {
355 container_mem_unlock(c);
356 lxc_container_free(c);
357 return 1;
358 }
359
360 container_mem_unlock(c);
361
362 return 0;
363 }
364
365 static bool do_lxcapi_is_defined(struct lxc_container *c)
366 {
367 int statret;
368 struct stat statbuf;
369 bool ret = false;
370
371 if (!c)
372 return false;
373
374 if (container_mem_lock(c))
375 return false;
376
377 if (!c->configfile)
378 goto on_error;
379
380 statret = stat(c->configfile, &statbuf);
381 if (statret != 0)
382 goto on_error;
383
384 ret = true;
385
386 on_error:
387 container_mem_unlock(c);
388
389 return ret;
390 }
391
392 #define WRAP_API(rettype, fnname) \
393 static rettype fnname(struct lxc_container *c) \
394 { \
395 rettype ret; \
396 bool reset_config = false; \
397 \
398 if (!current_config && c && c->lxc_conf) { \
399 current_config = c->lxc_conf; \
400 reset_config = true; \
401 } \
402 \
403 ret = do_##fnname(c); \
404 if (reset_config) \
405 current_config = NULL; \
406 \
407 return ret; \
408 }
409
410 #define WRAP_API_1(rettype, fnname, t1) \
411 static rettype fnname(struct lxc_container *c, t1 a1) \
412 { \
413 rettype ret; \
414 bool reset_config = false; \
415 \
416 if (!current_config && c && c->lxc_conf) { \
417 current_config = c->lxc_conf; \
418 reset_config = true; \
419 } \
420 \
421 ret = do_##fnname(c, a1); \
422 if (reset_config) \
423 current_config = NULL; \
424 \
425 return ret; \
426 }
427
428 #define WRAP_API_2(rettype, fnname, t1, t2) \
429 static rettype fnname(struct lxc_container *c, t1 a1, t2 a2) \
430 { \
431 rettype ret; \
432 bool reset_config = false; \
433 \
434 if (!current_config && c && c->lxc_conf) { \
435 current_config = c->lxc_conf; \
436 reset_config = true; \
437 } \
438 \
439 ret = do_##fnname(c, a1, a2); \
440 if (reset_config) \
441 current_config = NULL; \
442 \
443 return ret; \
444 }
445
446 #define WRAP_API_3(rettype, fnname, t1, t2, t3) \
447 static rettype fnname(struct lxc_container *c, t1 a1, t2 a2, t3 a3) \
448 { \
449 rettype ret; \
450 bool reset_config = false; \
451 \
452 if (!current_config && c && c->lxc_conf) { \
453 current_config = c->lxc_conf; \
454 reset_config = true; \
455 } \
456 \
457 ret = do_##fnname(c, a1, a2, a3); \
458 if (reset_config) \
459 current_config = NULL; \
460 \
461 return ret; \
462 }
463
464 WRAP_API(bool, lxcapi_is_defined)
465
466 static const char *do_lxcapi_state(struct lxc_container *c)
467 {
468 lxc_state_t s;
469
470 if (!c)
471 return NULL;
472
473 s = lxc_getstate(c->name, c->config_path);
474 return lxc_state2str(s);
475 }
476
477 WRAP_API(const char *, lxcapi_state)
478
479 static bool is_stopped(struct lxc_container *c)
480 {
481 lxc_state_t s;
482
483 s = lxc_getstate(c->name, c->config_path);
484 return (s == STOPPED);
485 }
486
487 static bool do_lxcapi_is_running(struct lxc_container *c)
488 {
489 if (!c)
490 return false;
491
492 return !is_stopped(c);
493 }
494
495 WRAP_API(bool, lxcapi_is_running)
496
497 static bool do_lxcapi_freeze(struct lxc_container *c)
498 {
499 int ret;
500
501 if (!c)
502 return false;
503
504 ret = lxc_freeze(c->name, c->config_path);
505 if (ret < 0)
506 return false;
507
508 return true;
509 }
510
511 WRAP_API(bool, lxcapi_freeze)
512
513 static bool do_lxcapi_unfreeze(struct lxc_container *c)
514 {
515 int ret;
516
517 if (!c)
518 return false;
519
520 ret = lxc_unfreeze(c->name, c->config_path);
521 if (ret < 0)
522 return false;
523
524 return true;
525 }
526
527 WRAP_API(bool, lxcapi_unfreeze)
528
529 static int do_lxcapi_console_getfd(struct lxc_container *c, int *ttynum, int *masterfd)
530 {
531 if (!c)
532 return -1;
533
534 return lxc_terminal_getfd(c, ttynum, masterfd);
535 }
536
537 WRAP_API_2(int, lxcapi_console_getfd, int *, int *)
538
539 static int lxcapi_console(struct lxc_container *c, int ttynum, int stdinfd,
540 int stdoutfd, int stderrfd, int escape)
541 {
542 int ret;
543
544 if (!c)
545 return -1;
546
547 current_config = c->lxc_conf;
548 ret = lxc_console(c, ttynum, stdinfd, stdoutfd, stderrfd, escape);
549 current_config = NULL;
550
551 return ret;
552 }
553
554 static int do_lxcapi_console_log(struct lxc_container *c, struct lxc_console_log *log)
555 {
556 int ret;
557
558 ret = lxc_cmd_console_log(c->name, do_lxcapi_get_config_path(c), log);
559 if (ret < 0) {
560 if (ret == -ENODATA)
561 NOTICE("The console log is empty");
562 else if (ret == -EFAULT)
563 NOTICE("The container does not keep a console log");
564 else if (ret == -ENOENT)
565 NOTICE("The container does not keep a console log file");
566 else if (ret == -EIO)
567 NOTICE("Failed to write console log to log file");
568 else
569 ERROR("Failed to retrieve console log");
570 }
571
572 return ret;
573 }
574
575 WRAP_API_1(int, lxcapi_console_log, struct lxc_console_log *)
576
577 static pid_t do_lxcapi_init_pid(struct lxc_container *c)
578 {
579 if (!c)
580 return -1;
581
582 return lxc_cmd_get_init_pid(c->name, c->config_path);
583 }
584
585 WRAP_API(pid_t, lxcapi_init_pid)
586
587 static bool load_config_locked(struct lxc_container *c, const char *fname)
588 {
589 if (!c->lxc_conf)
590 c->lxc_conf = lxc_conf_init();
591
592 if (!c->lxc_conf)
593 return false;
594
595 if (lxc_config_read(fname, c->lxc_conf, false) != 0)
596 return false;
597
598 c->lxc_conf->name = c->name;
599
600 return true;
601 }
602
603 static bool do_lxcapi_load_config(struct lxc_container *c, const char *alt_file)
604 {
605 int lret;
606 const char *fname;
607 bool need_disklock = false, ret = false;
608
609 if (!c)
610 return false;
611
612 fname = c->configfile;
613 if (alt_file)
614 fname = alt_file;
615 if (!fname)
616 return false;
617
618 /* If we're reading something other than the container's config, we only
619 * need to lock the in-memory container. If loading the container's
620 * config file, take the disk lock.
621 */
622 if (strcmp(fname, c->configfile) == 0)
623 need_disklock = true;
624
625 if (need_disklock)
626 lret = container_disk_lock(c);
627 else
628 lret = container_mem_lock(c);
629 if (lret)
630 return false;
631
632 ret = load_config_locked(c, fname);
633
634 if (need_disklock)
635 container_disk_unlock(c);
636 else
637 container_mem_unlock(c);
638
639 return ret;
640 }
641
642 WRAP_API_1(bool, lxcapi_load_config, const char *)
643
644 static bool do_lxcapi_want_daemonize(struct lxc_container *c, bool state)
645 {
646 if (!c || !c->lxc_conf)
647 return false;
648
649 if (container_mem_lock(c))
650 return false;
651
652 c->daemonize = state;
653
654 container_mem_unlock(c);
655
656 return true;
657 }
658
659 WRAP_API_1(bool, lxcapi_want_daemonize, bool)
660
661 static bool do_lxcapi_want_close_all_fds(struct lxc_container *c, bool state)
662 {
663 if (!c || !c->lxc_conf)
664 return false;
665
666 if (container_mem_lock(c))
667 return false;
668
669 c->lxc_conf->close_all_fds = state;
670
671 container_mem_unlock(c);
672
673 return true;
674 }
675
676 WRAP_API_1(bool, lxcapi_want_close_all_fds, bool)
677
678 static bool do_lxcapi_wait(struct lxc_container *c, const char *state,
679 int timeout)
680 {
681 int ret;
682
683 if (!c)
684 return false;
685
686 ret = lxc_wait(c->name, state, timeout, c->config_path);
687 return ret == 0;
688 }
689
690 WRAP_API_2(bool, lxcapi_wait, const char *, int)
691
692 static bool am_single_threaded(void)
693 {
694 DIR *dir;
695 struct dirent *direntp;
696 int count = 0;
697
698 dir = opendir("/proc/self/task");
699 if (!dir)
700 return false;
701
702 while ((direntp = readdir(dir))) {
703 if (strcmp(direntp->d_name, ".") == 0)
704 continue;
705
706 if (strcmp(direntp->d_name, "..") == 0)
707 continue;
708
709 count++;
710 if (count > 1)
711 break;
712 }
713 closedir(dir);
714
715 return count == 1;
716 }
717
718 static void push_arg(char ***argp, char *arg, int *nargs)
719 {
720 char *copy;
721 char **argv;
722
723 copy = must_copy_string(arg);
724
725 do {
726 argv = realloc(*argp, (*nargs + 2) * sizeof(char *));
727 } while (!argv);
728
729 *argp = argv;
730 argv[*nargs] = copy;
731 (*nargs)++;
732 argv[*nargs] = NULL;
733 }
734
735 static char **split_init_cmd(const char *incmd)
736 {
737 size_t len, retlen;
738 char *copy, *p;
739 char **argv;
740 int nargs = 0;
741 char *saveptr = NULL;
742
743 if (!incmd)
744 return NULL;
745
746 len = strlen(incmd) + 1;
747 copy = alloca(len);
748 retlen = strlcpy(copy, incmd, len);
749 if (retlen >= len) {
750 return NULL;
751 }
752
753 do {
754 argv = malloc(sizeof(char *));
755 } while (!argv);
756
757 argv[0] = NULL;
758 for (; (p = strtok_r(copy, " ", &saveptr)); copy = NULL)
759 push_arg(&argv, p, &nargs);
760
761 if (nargs == 0) {
762 free(argv);
763 return NULL;
764 }
765
766 return argv;
767 }
768
769 static void free_init_cmd(char **argv)
770 {
771 int i = 0;
772
773 if (!argv)
774 return;
775
776 while (argv[i])
777 free(argv[i++]);
778
779 free(argv);
780 }
781
782 static int lxc_rcv_status(int state_socket)
783 {
784 int ret;
785 int state = -1;
786
787 again:
788 /* Receive container state. */
789 ret = lxc_abstract_unix_rcv_credential(state_socket, &state,
790 sizeof(int));
791 if (ret <= 0) {
792 if (errno != EINTR)
793 return -1;
794 TRACE("Caught EINTR; retrying");
795 goto again;
796 }
797
798 return state;
799 }
800
801 static bool wait_on_daemonized_start(struct lxc_handler *handler, int pid)
802 {
803 int ret, state;
804
805 /* Close write end of the socket pair. */
806 close(handler->state_socket_pair[1]);
807 handler->state_socket_pair[1] = -1;
808
809 state = lxc_rcv_status(handler->state_socket_pair[0]);
810
811 /* Close read end of the socket pair. */
812 close(handler->state_socket_pair[0]);
813 handler->state_socket_pair[0] = -1;
814
815 /* The first child is going to fork() again and then exits. So we reap
816 * the first child here.
817 */
818 ret = wait_for_pid(pid);
819 if (ret < 0)
820 DEBUG("Failed waiting on first child %d", pid);
821 else
822 DEBUG("First child %d exited", pid);
823
824 if (state < 0) {
825 SYSERROR("Failed to receive the container state");
826 return false;
827 }
828
829 /* If we receive anything else then running we know that the container
830 * failed to start.
831 */
832 if (state != RUNNING) {
833 ERROR("Received container state \"%s\" instead of \"RUNNING\"",
834 lxc_state2str(state));
835 return false;
836 }
837
838 TRACE("Container is in \"RUNNING\" state");
839 return true;
840 }
841
842 static bool do_lxcapi_start(struct lxc_container *c, int useinit, char * const argv[])
843 {
844 int ret;
845 struct lxc_handler *handler;
846 struct lxc_conf *conf;
847 char *default_args[] = {
848 "/sbin/init",
849 NULL,
850 };
851 char **init_cmd = NULL;
852 int keepfds[3] = {-1, -1, -1};
853
854 /* container does exist */
855 if (!c)
856 return false;
857
858 /* If anything fails before we set error_num, we want an error in there.
859 */
860 c->error_num = 1;
861
862 /* Container has not been setup. */
863 if (!c->lxc_conf)
864 return false;
865
866 ret = ongoing_create(c);
867 if (ret < 0) {
868 ERROR("Failed checking for incomplete container creation");
869 return false;
870 } else if (ret == 1) {
871 ERROR("Ongoing container creation detected");
872 return false;
873 } else if (ret == 2) {
874 ERROR("Failed to create container");
875 do_lxcapi_destroy(c);
876 return false;
877 }
878
879 if (container_mem_lock(c))
880 return false;
881
882 conf = c->lxc_conf;
883
884 /* initialize handler */
885 handler = lxc_init_handler(c->name, conf, c->config_path, c->daemonize);
886
887 container_mem_unlock(c);
888 if (!handler)
889 return false;
890
891 if (!argv) {
892 if (useinit && conf->execute_cmd)
893 argv = init_cmd = split_init_cmd(conf->execute_cmd);
894 else
895 argv = init_cmd = split_init_cmd(conf->init_cmd);
896 }
897
898 /* ... otherwise use default_args. */
899 if (!argv) {
900 if (useinit) {
901 ERROR("No valid init detected");
902 lxc_free_handler(handler);
903 return false;
904 }
905 argv = default_args;
906 }
907
908 /* I'm not sure what locks we want here.Any? Is liblxc's locking enough
909 * here to protect the on disk container? We don't want to exclude
910 * things like lxc_info while the container is running.
911 */
912 if (c->daemonize) {
913 bool started;
914 char title[2048];
915 pid_t pid;
916
917 pid = fork();
918 if (pid < 0) {
919 free_init_cmd(init_cmd);
920 lxc_free_handler(handler);
921 return false;
922 }
923
924 /* first parent */
925 if (pid != 0) {
926 /* Set to NULL because we don't want father unlink
927 * the PID file, child will do the free and unlink.
928 */
929 c->pidfile = NULL;
930
931 /* Wait for container to tell us whether it started
932 * successfully.
933 */
934 started = wait_on_daemonized_start(handler, pid);
935
936 free_init_cmd(init_cmd);
937 lxc_free_handler(handler);
938 return started;
939 }
940
941 /* first child */
942
943 /* We don't really care if this doesn't print all the
944 * characters. All that it means is that the proctitle will be
945 * ugly. Similarly, we also don't care if setproctitle() fails.
946 * */
947 (void)snprintf(title, sizeof(title), "[lxc monitor] %s %s", c->config_path, c->name);
948 INFO("Attempting to set proc title to %s", title);
949 (void)setproctitle(title);
950
951 /* We fork() a second time to be reparented to init. Like
952 * POSIX's daemon() function we change to "/" and redirect
953 * std{in,out,err} to /dev/null.
954 */
955 pid = fork();
956 if (pid < 0) {
957 SYSERROR("Failed to fork first child process");
958 _exit(EXIT_FAILURE);
959 }
960
961 /* second parent */
962 if (pid != 0) {
963 free_init_cmd(init_cmd);
964 lxc_free_handler(handler);
965 _exit(EXIT_SUCCESS);
966 }
967
968 /* second child */
969
970 /* change to / directory */
971 ret = chdir("/");
972 if (ret < 0) {
973 SYSERROR("Failed to change to \"/\" directory");
974 _exit(EXIT_FAILURE);
975 }
976
977 keepfds[0] = handler->conf->maincmd_fd;
978 keepfds[1] = handler->state_socket_pair[0];
979 keepfds[2] = handler->state_socket_pair[1];
980 ret = lxc_check_inherited(conf, true, keepfds,
981 sizeof(keepfds) / sizeof(keepfds[0]));
982 if (ret < 0)
983 _exit(EXIT_FAILURE);
984
985 /* redirect std{in,out,err} to /dev/null */
986 ret = null_stdfds();
987 if (ret < 0) {
988 ERROR("Failed to redirect std{in,out,err} to /dev/null");
989 _exit(EXIT_FAILURE);
990 }
991
992 /* become session leader */
993 ret = setsid();
994 if (ret < 0)
995 TRACE("Process %d is already process group leader", lxc_raw_getpid());
996 } else {
997 if (!am_single_threaded()) {
998 ERROR("Cannot start non-daemonized container when threaded");
999 free_init_cmd(init_cmd);
1000 lxc_free_handler(handler);
1001 return false;
1002 }
1003 }
1004
1005 /* We need to write PID file after daemonize, so we always
1006 * write the right PID.
1007 */
1008 if (c->pidfile) {
1009 int ret, w;
1010 char pidstr[LXC_NUMSTRLEN64];
1011
1012 w = snprintf(pidstr, LXC_NUMSTRLEN64, "%d", (int)lxc_raw_getpid());
1013 if (w < 0 || (size_t)w >= LXC_NUMSTRLEN64) {
1014 free_init_cmd(init_cmd);
1015 lxc_free_handler(handler);
1016
1017 SYSERROR("Failed to write monitor pid to \"%s\"", c->pidfile);
1018
1019 if (c->daemonize)
1020 _exit(EXIT_FAILURE);
1021
1022 return false;
1023 }
1024
1025 ret = lxc_write_to_file(c->pidfile, pidstr, w, false, 0600);
1026 if (ret < 0) {
1027 free_init_cmd(init_cmd);
1028 lxc_free_handler(handler);
1029
1030 SYSERROR("Failed to write '%s'", c->pidfile);
1031
1032 if (c->daemonize)
1033 _exit(EXIT_FAILURE);
1034
1035 return false;
1036 }
1037 }
1038
1039 conf->reboot = 0;
1040
1041 /* Unshare the mount namespace if requested */
1042 if (conf->monitor_unshare) {
1043 ret = unshare(CLONE_NEWNS);
1044 if (ret < 0) {
1045 SYSERROR("failed to unshare mount namespace");
1046 lxc_free_handler(handler);
1047 ret = 1;
1048 goto on_error;
1049 }
1050
1051 ret = mount(NULL, "/", NULL, MS_SLAVE|MS_REC, NULL);
1052 if (ret < 0) {
1053 SYSERROR("Failed to make / rslave at startup");
1054 lxc_free_handler(handler);
1055 ret = 1;
1056 goto on_error;
1057 }
1058 }
1059
1060 reboot:
1061 if (conf->reboot == 2) {
1062 /* initialize handler */
1063 handler = lxc_init_handler(c->name, conf, c->config_path, c->daemonize);
1064 if (!handler) {
1065 ret = 1;
1066 goto on_error;
1067 }
1068 }
1069
1070 keepfds[0] = handler->conf->maincmd_fd;
1071 keepfds[1] = handler->state_socket_pair[0];
1072 keepfds[2] = handler->state_socket_pair[1];
1073 ret = lxc_check_inherited(conf, c->daemonize, keepfds,
1074 sizeof(keepfds) / sizeof(keepfds[0]));
1075 if (ret < 0) {
1076 lxc_free_handler(handler);
1077 ret = 1;
1078 goto on_error;
1079 }
1080
1081 if (useinit)
1082 ret = lxc_execute(c->name, argv, 1, handler, c->config_path,
1083 c->daemonize, &c->error_num);
1084 else
1085 ret = lxc_start(c->name, argv, handler, c->config_path,
1086 c->daemonize, &c->error_num);
1087
1088 if (conf->reboot == 1) {
1089 INFO("Container requested reboot");
1090 conf->reboot = 2;
1091 goto reboot;
1092 }
1093
1094 on_error:
1095 if (c->pidfile) {
1096 unlink(c->pidfile);
1097 free(c->pidfile);
1098 c->pidfile = NULL;
1099 }
1100 free_init_cmd(init_cmd);
1101
1102 if (c->daemonize && ret != 0)
1103 _exit(EXIT_FAILURE);
1104 else if (c->daemonize)
1105 _exit(EXIT_SUCCESS);
1106
1107 if (ret != 0)
1108 return false;
1109
1110 return true;
1111 }
1112
1113 static bool lxcapi_start(struct lxc_container *c, int useinit,
1114 char *const argv[])
1115 {
1116 bool ret;
1117
1118 current_config = c ? c->lxc_conf : NULL;
1119 ret = do_lxcapi_start(c, useinit, argv);
1120 current_config = NULL;
1121
1122 return ret;
1123 }
1124
1125 /* Note, there MUST be an ending NULL. */
1126 static bool lxcapi_startl(struct lxc_container *c, int useinit, ...)
1127 {
1128 va_list ap;
1129 char **inargs = NULL;
1130 bool bret = false;
1131
1132 /* container exists */
1133 if (!c)
1134 return false;
1135
1136 current_config = c->lxc_conf;
1137
1138 va_start(ap, useinit);
1139 inargs = lxc_va_arg_list_to_argv(ap, 0, 1);
1140 va_end(ap);
1141 if (!inargs)
1142 goto on_error;
1143
1144 /* pass NULL if no arguments were supplied */
1145 bret = do_lxcapi_start(c, useinit, *inargs ? inargs : NULL);
1146
1147 on_error:
1148 if (inargs) {
1149 char **arg;
1150 for (arg = inargs; *arg; arg++)
1151 free(*arg);
1152 free(inargs);
1153 }
1154
1155 current_config = NULL;
1156
1157 return bret;
1158 }
1159
1160 static bool do_lxcapi_stop(struct lxc_container *c)
1161 {
1162 int ret;
1163
1164 if (!c)
1165 return false;
1166
1167 ret = lxc_cmd_stop(c->name, c->config_path);
1168
1169 return ret == 0;
1170 }
1171
1172 WRAP_API(bool, lxcapi_stop)
1173
1174 static int do_create_container_dir(const char *path, struct lxc_conf *conf)
1175 {
1176 int lasterr;
1177 size_t len;
1178 char *p;
1179 int ret = -1;
1180
1181 mode_t mask = umask(0002);
1182 ret = mkdir(path, 0770);
1183 lasterr = errno;
1184 umask(mask);
1185 errno = lasterr;
1186 if (ret) {
1187 if (errno != EEXIST)
1188 return -1;
1189
1190 ret = 0;
1191 }
1192
1193 len = strlen(path);
1194 p = alloca(len + 1);
1195 strcpy(p, path);
1196 if (!lxc_list_empty(&conf->id_map)) {
1197 ret = chown_mapped_root(p, conf);
1198 if (ret < 0)
1199 ret = -1;
1200 }
1201
1202 return ret;
1203 }
1204
1205 /* Create the standard expected container dir. */
1206 static bool create_container_dir(struct lxc_container *c)
1207 {
1208 int ret;
1209 size_t len;
1210 char *s;
1211
1212 len = strlen(c->config_path) + strlen(c->name) + 2;
1213 s = malloc(len);
1214 if (!s)
1215 return false;
1216
1217 ret = snprintf(s, len, "%s/%s", c->config_path, c->name);
1218 if (ret < 0 || (size_t)ret >= len) {
1219 free(s);
1220 return false;
1221 }
1222
1223 ret = do_create_container_dir(s, c->lxc_conf);
1224 free(s);
1225
1226 return ret == 0;
1227 }
1228
1229 /* do_storage_create: thin wrapper around storage_create(). Like
1230 * storage_create(), it returns a mounted bdev on success, NULL on error.
1231 */
1232 static struct lxc_storage *do_storage_create(struct lxc_container *c,
1233 const char *type,
1234 struct bdev_specs *specs)
1235 {
1236 int ret;
1237 size_t len;
1238 char *dest;
1239 struct lxc_storage *bdev;
1240
1241 /* rootfs.path or lxcpath/lxcname/rootfs */
1242 if (c->lxc_conf->rootfs.path &&
1243 (access(c->lxc_conf->rootfs.path, F_OK) == 0)) {
1244 const char *rpath = c->lxc_conf->rootfs.path;
1245 len = strlen(rpath) + 1;
1246 dest = alloca(len);
1247 ret = snprintf(dest, len, "%s", rpath);
1248 } else {
1249 const char *lxcpath = do_lxcapi_get_config_path(c);
1250 len = strlen(c->name) + strlen(lxcpath) + 9;
1251 dest = alloca(len);
1252 ret = snprintf(dest, len, "%s/%s/rootfs", lxcpath, c->name);
1253 }
1254 if (ret < 0 || (size_t)ret >= len)
1255 return NULL;
1256
1257 bdev = storage_create(dest, type, c->name, specs);
1258 if (!bdev) {
1259 ERROR("Failed to create \"%s\" storage", type);
1260 return NULL;
1261 }
1262
1263 if (!c->set_config_item(c, "lxc.rootfs.path", bdev->src)) {
1264 ERROR("Failed to set \"lxc.rootfs.path = %s\"", bdev->src);
1265 return NULL;
1266 }
1267
1268 /* If we are not root, chown the rootfs dir to root in the target user
1269 * namespace.
1270 */
1271 ret = geteuid();
1272 if (ret != 0 || (c->lxc_conf && !lxc_list_empty(&c->lxc_conf->id_map))) {
1273 ret = chown_mapped_root(bdev->dest, c->lxc_conf);
1274 if (ret < 0) {
1275 ERROR("Error chowning \"%s\" to container root", bdev->dest);
1276 suggest_default_idmap();
1277 storage_put(bdev);
1278 return NULL;
1279 }
1280 }
1281
1282 return bdev;
1283 }
1284
1285 static char *lxcbasename(char *path)
1286 {
1287 char *p;
1288
1289 p = path + strlen(path) - 1;
1290 while (*p != '/' && p > path)
1291 p--;
1292
1293 return p;
1294 }
1295
1296 static bool create_run_template(struct lxc_container *c, char *tpath,
1297 bool need_null_stdfds, char *const argv[])
1298 {
1299 int ret;
1300 pid_t pid;
1301
1302 if (!tpath)
1303 return true;
1304
1305 pid = fork();
1306 if (pid < 0) {
1307 SYSERROR("Failed to fork task for container creation template");
1308 return false;
1309 }
1310
1311 if (pid == 0) { /* child */
1312 int i, len;
1313 char *namearg, *patharg, *rootfsarg;
1314 char **newargv;
1315 int nargs = 0;
1316 struct lxc_storage *bdev = NULL;
1317 struct lxc_conf *conf = c->lxc_conf;
1318 uid_t euid;
1319
1320 if (need_null_stdfds) {
1321 ret = null_stdfds();
1322 if (ret < 0)
1323 _exit(EXIT_FAILURE);
1324 }
1325
1326 bdev = storage_init(c->lxc_conf);
1327 if (!bdev) {
1328 ERROR("Failed to initialize storage");
1329 _exit(EXIT_FAILURE);
1330 }
1331
1332 euid = geteuid();
1333 if (euid == 0) {
1334 ret = unshare(CLONE_NEWNS);
1335 if (ret < 0) {
1336 ERROR("Failed to unshare CLONE_NEWNS");
1337 _exit(EXIT_FAILURE);
1338 }
1339
1340 ret = detect_shared_rootfs();
1341 if (ret == 1) {
1342 ret = mount(NULL, "/", NULL, MS_SLAVE | MS_REC, NULL);
1343 if (ret < 0) {
1344 SYSERROR("Failed to make \"/\" rslave");
1345 ERROR("Continuing...");
1346 }
1347 }
1348 }
1349
1350 if (strcmp(bdev->type, "dir") != 0 && strcmp(bdev->type, "btrfs") != 0) {
1351 if (euid != 0) {
1352 ERROR("Unprivileged users can only create "
1353 "btrfs and directory-backed containers");
1354 _exit(EXIT_FAILURE);
1355 }
1356
1357 if (strcmp(bdev->type, "overlay") == 0 ||
1358 strcmp(bdev->type, "overlayfs") == 0) {
1359 /* If we create an overlay container we need to
1360 * rsync the contents into
1361 * <container-path>/<container-name>/rootfs.
1362 * However, the overlay mount function will
1363 * mount will mount
1364 * <container-path>/<container-name>/delta0
1365 * over
1366 * <container-path>/<container-name>/rootfs
1367 * which means we would rsync the rootfs into
1368 * the delta directory. That doesn't make sense
1369 * since the delta directory only exists to
1370 * record the differences to
1371 * <container-path>/<container-name>/rootfs. So
1372 * let's simply bind-mount here and then rsync
1373 * directly into
1374 * <container-path>/<container-name>/rootfs.
1375 */
1376 char *src;
1377
1378 src = ovl_get_rootfs(bdev->src, &(size_t){0});
1379 if (!src) {
1380 ERROR("Failed to get rootfs");
1381 _exit(EXIT_FAILURE);
1382 }
1383
1384 ret = mount(src, bdev->dest, "bind", MS_BIND | MS_REC, NULL);
1385 if (ret < 0) {
1386 ERROR("Failed to mount rootfs");
1387 return -1;
1388 }
1389 } else {
1390 ret = bdev->ops->mount(bdev);
1391 if (ret < 0) {
1392 ERROR("Failed to mount rootfs");
1393 _exit(EXIT_FAILURE);
1394 }
1395 }
1396 } else { /* TODO come up with a better way here! */
1397 const char *src;
1398 free(bdev->dest);
1399 src = lxc_storage_get_path(bdev->src, bdev->type);
1400 bdev->dest = strdup(src);
1401 }
1402
1403 /* Create our new array, pre-pend the template name and base
1404 * args.
1405 */
1406 if (argv)
1407 for (nargs = 0; argv[nargs]; nargs++) {
1408 ;
1409 }
1410 /* template, path, rootfs and name args */
1411 nargs += 4;
1412
1413 newargv = malloc(nargs * sizeof(*newargv));
1414 if (!newargv)
1415 _exit(EXIT_FAILURE);
1416 newargv[0] = lxcbasename(tpath);
1417
1418 /* --path */
1419 len = strlen(c->config_path) + strlen(c->name) + strlen("--path=") + 2;
1420 patharg = malloc(len);
1421 if (!patharg)
1422 _exit(EXIT_FAILURE);
1423 ret = snprintf(patharg, len, "--path=%s/%s", c->config_path, c->name);
1424 if (ret < 0 || ret >= len)
1425 _exit(EXIT_FAILURE);
1426 newargv[1] = patharg;
1427
1428 /* --name */
1429 len = strlen("--name=") + strlen(c->name) + 1;
1430 namearg = malloc(len);
1431 if (!namearg)
1432 _exit(EXIT_FAILURE);
1433 ret = snprintf(namearg, len, "--name=%s", c->name);
1434 if (ret < 0 || ret >= len)
1435 _exit(EXIT_FAILURE);
1436 newargv[2] = namearg;
1437
1438 /* --rootfs */
1439 len = strlen("--rootfs=") + 1 + strlen(bdev->dest);
1440 rootfsarg = malloc(len);
1441 if (!rootfsarg)
1442 _exit(EXIT_FAILURE);
1443 ret = snprintf(rootfsarg, len, "--rootfs=%s", bdev->dest);
1444 if (ret < 0 || ret >= len)
1445 _exit(EXIT_FAILURE);
1446 newargv[3] = rootfsarg;
1447
1448 /* add passed-in args */
1449 if (argv)
1450 for (i = 4; i < nargs; i++)
1451 newargv[i] = argv[i - 4];
1452
1453 /* add trailing NULL */
1454 nargs++;
1455 newargv = realloc(newargv, nargs * sizeof(*newargv));
1456 if (!newargv)
1457 _exit(EXIT_FAILURE);
1458 newargv[nargs - 1] = NULL;
1459
1460 /* If we're running the template in a mapped userns, then we
1461 * prepend the template command with: lxc-usernsexec <-m map1>
1462 * ... <-m mapn> -- and we append "--mapped-uid x", where x is
1463 * the mapped uid for our geteuid()
1464 */
1465 if (!lxc_list_empty(&conf->id_map)) {
1466 int extraargs, hostuid_mapped, hostgid_mapped;
1467 char **n2;
1468 char txtuid[20], txtgid[20];
1469 struct lxc_list *it;
1470 struct id_map *map;
1471 int n2args = 1;
1472
1473 n2 = malloc(n2args * sizeof(*n2));
1474 if (!n2)
1475 _exit(EXIT_FAILURE);
1476
1477 newargv[0] = tpath;
1478 tpath = "lxc-usernsexec";
1479 n2[0] = "lxc-usernsexec";
1480 lxc_list_for_each(it, &conf->id_map) {
1481 map = it->elem;
1482 n2args += 2;
1483 n2 = realloc(n2, n2args * sizeof(char *));
1484 if (!n2)
1485 _exit(EXIT_FAILURE);
1486
1487 n2[n2args - 2] = "-m";
1488 n2[n2args - 1] = malloc(200);
1489 if (!n2[n2args - 1])
1490 _exit(EXIT_FAILURE);
1491
1492 ret = snprintf(n2[n2args - 1], 200, "%c:%lu:%lu:%lu",
1493 map->idtype == ID_TYPE_UID ? 'u' : 'g',
1494 map->nsid, map->hostid, map->range);
1495 if (ret < 0 || ret >= 200)
1496 _exit(EXIT_FAILURE);
1497 }
1498
1499 hostuid_mapped = mapped_hostid(geteuid(), conf, ID_TYPE_UID);
1500 extraargs = hostuid_mapped >= 0 ? 1 : 3;
1501 n2 = realloc(n2, (nargs + n2args + extraargs) * sizeof(char *));
1502 if (!n2)
1503 _exit(EXIT_FAILURE);
1504
1505 if (hostuid_mapped < 0) {
1506 hostuid_mapped = find_unmapped_nsid(conf, ID_TYPE_UID);
1507 n2[n2args++] = "-m";
1508 if (hostuid_mapped < 0) {
1509 ERROR("Failed to find free uid to map");
1510 _exit(EXIT_FAILURE);
1511 }
1512
1513 n2[n2args++] = malloc(200);
1514 if (!n2[n2args - 1]) {
1515 SYSERROR("out of memory");
1516 _exit(EXIT_FAILURE);
1517 }
1518 ret = snprintf(n2[n2args - 1], 200, "u:%d:%d:1",
1519 hostuid_mapped, geteuid());
1520 if (ret < 0 || ret >= 200)
1521 _exit(EXIT_FAILURE);
1522 }
1523
1524 hostgid_mapped = mapped_hostid(getegid(), conf, ID_TYPE_GID);
1525 extraargs = hostgid_mapped >= 0 ? 1 : 3;
1526 n2 = realloc(n2, (nargs + n2args + extraargs) * sizeof(char *));
1527 if (!n2)
1528 _exit(EXIT_FAILURE);
1529
1530 if (hostgid_mapped < 0) {
1531 hostgid_mapped = find_unmapped_nsid(conf, ID_TYPE_GID);
1532 n2[n2args++] = "-m";
1533 if (hostgid_mapped < 0) {
1534 ERROR("Failed to find free gid to map");
1535 _exit(EXIT_FAILURE);
1536 }
1537
1538 n2[n2args++] = malloc(200);
1539 if (!n2[n2args - 1]) {
1540 SYSERROR("out of memory");
1541 _exit(EXIT_FAILURE);
1542 }
1543
1544 ret = snprintf(n2[n2args - 1], 200, "g:%d:%d:1",
1545 hostgid_mapped, getegid());
1546 if (ret < 0 || ret >= 200)
1547 _exit(EXIT_FAILURE);
1548 }
1549 n2[n2args++] = "--";
1550 for (i = 0; i < nargs; i++)
1551 n2[i + n2args] = newargv[i];
1552 n2args += nargs;
1553
1554 /* Finally add "--mapped-uid $uid" to tell template what
1555 * to chown cached images to.
1556 */
1557 n2args += 4;
1558 n2 = realloc(n2, n2args * sizeof(char *));
1559 if (!n2)
1560 _exit(EXIT_FAILURE);
1561
1562 /* note n2[n2args-1] is NULL */
1563 n2[n2args - 5] = "--mapped-uid";
1564 snprintf(txtuid, 20, "%d", hostuid_mapped);
1565 n2[n2args - 4] = txtuid;
1566 n2[n2args - 3] = "--mapped-gid";
1567 snprintf(txtgid, 20, "%d", hostgid_mapped);
1568 n2[n2args - 2] = txtgid;
1569 n2[n2args - 1] = NULL;
1570 free(newargv);
1571 newargv = n2;
1572 }
1573
1574 execvp(tpath, newargv);
1575 SYSERROR("Failed to execute template %s", tpath);
1576 _exit(EXIT_FAILURE);
1577 }
1578
1579 ret = wait_for_pid(pid);
1580 if (ret != 0) {
1581 ERROR("Failed to create container from template");
1582 return false;
1583 }
1584
1585 return true;
1586 }
1587
1588 static bool prepend_lxc_header(char *path, const char *t, char *const argv[])
1589 {
1590 long flen;
1591 size_t len;
1592 char *contents;
1593 FILE *f;
1594 int ret = -1;
1595 #if HAVE_LIBGNUTLS
1596 int i;
1597 unsigned char md_value[SHA_DIGEST_LENGTH];
1598 char *tpath;
1599 #endif
1600
1601 f = fopen(path, "r");
1602 if (f == NULL)
1603 return false;
1604
1605 ret = fseek(f, 0, SEEK_END);
1606 if (ret < 0)
1607 goto out_error;
1608
1609 ret = -1;
1610 flen = ftell(f);
1611 if (flen < 0)
1612 goto out_error;
1613
1614 ret = fseek(f, 0, SEEK_SET);
1615 if (ret < 0)
1616 goto out_error;
1617
1618 ret = fseek(f, 0, SEEK_SET);
1619 if (ret < 0)
1620 goto out_error;
1621
1622 ret = -1;
1623 contents = malloc(flen + 1);
1624 if (!contents)
1625 goto out_error;
1626
1627 len = fread(contents, 1, flen, f);
1628 if (len != flen)
1629 goto out_free_contents;
1630
1631 contents[flen] = '\0';
1632 ret = fclose(f);
1633 f = NULL;
1634 if (ret < 0)
1635 goto out_free_contents;
1636
1637 #if HAVE_LIBGNUTLS
1638 tpath = get_template_path(t);
1639 if (!tpath) {
1640 ERROR("Invalid template \"%s\" specified", t);
1641 goto out_free_contents;
1642 }
1643
1644 ret = sha1sum_file(tpath, md_value);
1645 if (ret < 0) {
1646 ERROR("Failed to get sha1sum of %s", tpath);
1647 free(tpath);
1648 goto out_free_contents;
1649 }
1650 free(tpath);
1651 #endif
1652
1653 f = fopen(path, "w");
1654 if (f == NULL) {
1655 SYSERROR("Reopening config for writing");
1656 free(contents);
1657 return false;
1658 }
1659
1660 fprintf(f, "# Template used to create this container: %s\n", t);
1661 if (argv) {
1662 fprintf(f, "# Parameters passed to the template:");
1663 while (*argv) {
1664 fprintf(f, " %s", *argv);
1665 argv++;
1666 }
1667 fprintf(f, "\n");
1668 }
1669 #if HAVE_LIBGNUTLS
1670 fprintf(f, "# Template script checksum (SHA-1): ");
1671 for (i=0; i<SHA_DIGEST_LENGTH; i++)
1672 fprintf(f, "%02x", md_value[i]);
1673 fprintf(f, "\n");
1674 #endif
1675 fprintf(f, "# For additional config options, please look at lxc.container.conf(5)\n");
1676 fprintf(f, "\n# Uncomment the following line to support nesting containers:\n");
1677 fprintf(f, "#lxc.include = " LXCTEMPLATECONFIG "/nesting.conf\n");
1678 fprintf(f, "# (Be aware this has security implications)\n\n");
1679 if (fwrite(contents, 1, flen, f) != flen) {
1680 SYSERROR("Writing original contents");
1681 free(contents);
1682 fclose(f);
1683 return false;
1684 }
1685
1686 ret = 0;
1687
1688 out_free_contents:
1689 free(contents);
1690
1691 out_error:
1692 if (f) {
1693 int newret;
1694 newret = fclose(f);
1695 if (ret == 0)
1696 ret = newret;
1697 }
1698
1699 if (ret < 0) {
1700 SYSERROR("Error prepending header");
1701 return false;
1702 }
1703
1704 return true;
1705 }
1706
1707 static void lxcapi_clear_config(struct lxc_container *c)
1708 {
1709 if (!c || !c->lxc_conf)
1710 return;
1711
1712 lxc_conf_free(c->lxc_conf);
1713 c->lxc_conf = NULL;
1714 }
1715
1716 #define do_lxcapi_clear_config(c) lxcapi_clear_config(c)
1717
1718 /*
1719 * lxcapi_create:
1720 * create a container with the given parameters.
1721 * @c: container to be created. It has the lxcpath, name, and a starting
1722 * configuration already set
1723 * @t: the template to execute to instantiate the root filesystem and
1724 * adjust the configuration.
1725 * @bdevtype: backing store type to use. If NULL, dir will be used.
1726 * @specs: additional parameters for the backing store, i.e. LVM vg to
1727 * use.
1728 *
1729 * @argv: the arguments to pass to the template, terminated by NULL. If no
1730 * arguments, you can just pass NULL.
1731 */
1732 static bool do_lxcapi_create(struct lxc_container *c, const char *t,
1733 const char *bdevtype, struct bdev_specs *specs,
1734 int flags, char *const argv[])
1735 {
1736 int partial_fd;
1737 mode_t mask;
1738 pid_t pid;
1739 bool ret = false;
1740 char *tpath = NULL;
1741
1742 if (!c)
1743 return false;
1744
1745 if (t) {
1746 tpath = get_template_path(t);
1747 if (!tpath) {
1748 ERROR("Unknown template \"%s\"", t);
1749 goto out;
1750 }
1751 }
1752
1753 /* If a template is passed in, and the rootfs already is defined in the
1754 * container config and exists, then the caller is trying to create an
1755 * existing container. Return an error, but do NOT delete the container.
1756 */
1757 if (do_lxcapi_is_defined(c) && c->lxc_conf && c->lxc_conf->rootfs.path &&
1758 access(c->lxc_conf->rootfs.path, F_OK) == 0 && tpath) {
1759 ERROR("Container \"%s\" already exists in \"%s\"", c->name,
1760 c->config_path);
1761 goto free_tpath;
1762 }
1763
1764 if (!c->lxc_conf) {
1765 if (!do_lxcapi_load_config(c, lxc_global_config_value("lxc.default_config"))) {
1766 ERROR("Error loading default configuration file %s",
1767 lxc_global_config_value("lxc.default_config"));
1768 goto free_tpath;
1769 }
1770 }
1771
1772 if (!create_container_dir(c))
1773 goto free_tpath;
1774
1775 /* If both template and rootfs.path are set, template is setup as
1776 * rootfs.path. The container is already created if we have a config and
1777 * rootfs.path is accessible
1778 */
1779 if (!c->lxc_conf->rootfs.path && !tpath) {
1780 /* No template passed in and rootfs does not exist. */
1781 if (!c->save_config(c, NULL)) {
1782 ERROR("Failed to save initial config for \"%s\"", c->name);
1783 goto out;
1784 }
1785 ret = true;
1786 goto out;
1787 }
1788
1789 /* Rootfs passed into configuration, but does not exist. */
1790 if (c->lxc_conf->rootfs.path && access(c->lxc_conf->rootfs.path, F_OK) != 0)
1791 goto out;
1792
1793 if (do_lxcapi_is_defined(c) && c->lxc_conf->rootfs.path && !tpath) {
1794 /* Rootfs already existed, user just wanted to save the loaded
1795 * configuration.
1796 */
1797 if (!c->save_config(c, NULL))
1798 ERROR("Failed to save initial config for \"%s\"", c->name);
1799 ret = true;
1800 goto out;
1801 }
1802
1803 /* Mark that this container is being created */
1804 partial_fd = create_partial(c);
1805 if (partial_fd < 0)
1806 goto out;
1807
1808 /* No need to get disk lock bc we have the partial lock. */
1809
1810 mask = umask(0022);
1811
1812 /* Create the storage.
1813 * Note we can't do this in the same task as we use to execute the
1814 * template because of the way zfs works.
1815 * After you 'zfs create', zfs mounts the fs only in the initial
1816 * namespace.
1817 */
1818 pid = fork();
1819 if (pid < 0) {
1820 SYSERROR("Failed to fork task for container creation template");
1821 goto out_unlock;
1822 }
1823
1824 if (pid == 0) { /* child */
1825 struct lxc_storage *bdev = NULL;
1826
1827 bdev = do_storage_create(c, bdevtype, specs);
1828 if (!bdev) {
1829 ERROR("Failed to create %s storage for %s",
1830 bdevtype ? bdevtype : "(none)", c->name);
1831 _exit(EXIT_FAILURE);
1832 }
1833
1834 /* Save config file again to store the new rootfs location. */
1835 if (!do_lxcapi_save_config(c, NULL)) {
1836 ERROR("Failed to save initial config for %s", c->name);
1837 /* Parent task won't see the storage driver in the
1838 * config so we delete it.
1839 */
1840 bdev->ops->umount(bdev);
1841 bdev->ops->destroy(bdev);
1842 _exit(EXIT_FAILURE);
1843 }
1844 _exit(EXIT_SUCCESS);
1845 }
1846 if (wait_for_pid(pid) != 0)
1847 goto out_unlock;
1848
1849 /* Reload config to get the rootfs. */
1850 lxc_conf_free(c->lxc_conf);
1851 c->lxc_conf = NULL;
1852 if (!load_config_locked(c, c->configfile))
1853 goto out_unlock;
1854
1855 if (!create_run_template(c, tpath, !!(flags & LXC_CREATE_QUIET), argv))
1856 goto out_unlock;
1857
1858 /* Now clear out the lxc_conf we have, reload from the created
1859 * container.
1860 */
1861 do_lxcapi_clear_config(c);
1862
1863 if (t) {
1864 if (!prepend_lxc_header(c->configfile, tpath, argv)) {
1865 ERROR("Failed to prepend header to config file");
1866 goto out_unlock;
1867 }
1868 }
1869 ret = load_config_locked(c, c->configfile);
1870
1871 out_unlock:
1872 umask(mask);
1873 if (partial_fd >= 0)
1874 remove_partial(c, partial_fd);
1875 out:
1876 if (!ret)
1877 container_destroy(c, NULL);
1878 free_tpath:
1879 free(tpath);
1880 return ret;
1881 }
1882
1883 static bool lxcapi_create(struct lxc_container *c, const char *t,
1884 const char *bdevtype, struct bdev_specs *specs,
1885 int flags, char *const argv[])
1886 {
1887 bool ret;
1888 current_config = c ? c->lxc_conf : NULL;
1889 ret = do_lxcapi_create(c, t, bdevtype, specs, flags, argv);
1890 current_config = NULL;
1891 return ret;
1892 }
1893
1894 static bool do_lxcapi_reboot(struct lxc_container *c)
1895 {
1896 int ret;
1897 pid_t pid;
1898 int rebootsignal = SIGINT;
1899
1900 if (!c)
1901 return false;
1902
1903 if (!do_lxcapi_is_running(c))
1904 return false;
1905
1906 pid = do_lxcapi_init_pid(c);
1907 if (pid <= 0)
1908 return false;
1909
1910 if (c->lxc_conf && c->lxc_conf->rebootsignal)
1911 rebootsignal = c->lxc_conf->rebootsignal;
1912
1913 ret = kill(pid, rebootsignal);
1914 if (ret < 0) {
1915 WARN("Failed to send signal %d to pid %d", rebootsignal, pid);
1916 return false;
1917 }
1918
1919 return true;
1920 }
1921
1922 WRAP_API(bool, lxcapi_reboot)
1923
1924 static bool do_lxcapi_reboot2(struct lxc_container *c, int timeout)
1925 {
1926 int killret, ret;
1927 pid_t pid;
1928 int rebootsignal = SIGINT, state_client_fd = -1;
1929 lxc_state_t states[MAX_STATE] = {0};
1930
1931 if (!c)
1932 return false;
1933
1934 if (!do_lxcapi_is_running(c))
1935 return true;
1936
1937 pid = do_lxcapi_init_pid(c);
1938 if (pid <= 0)
1939 return true;
1940
1941 if (c->lxc_conf && c->lxc_conf->rebootsignal)
1942 rebootsignal = c->lxc_conf->rebootsignal;
1943
1944 /* Add a new state client before sending the shutdown signal so that we
1945 * don't miss a state.
1946 */
1947 if (timeout != 0) {
1948 states[RUNNING] = 2;
1949 ret = lxc_cmd_add_state_client(c->name, c->config_path, states,
1950 &state_client_fd);
1951 if (ret < 0)
1952 return false;
1953
1954 if (state_client_fd < 0)
1955 return false;
1956
1957 if (ret == RUNNING)
1958 return true;
1959
1960 if (ret < MAX_STATE)
1961 return false;
1962 }
1963
1964 /* Send reboot signal to container. */
1965 killret = kill(pid, rebootsignal);
1966 if (killret < 0) {
1967 if (state_client_fd >= 0)
1968 close(state_client_fd);
1969 WARN("Failed to send signal %d to pid %d", rebootsignal, pid);
1970 return false;
1971 }
1972 TRACE("Sent signal %d to pid %d", rebootsignal, pid);
1973
1974 if (timeout == 0)
1975 return true;
1976
1977 ret = lxc_cmd_sock_rcv_state(state_client_fd, timeout);
1978 close(state_client_fd);
1979 if (ret < 0)
1980 return false;
1981
1982 TRACE("Received state \"%s\"", lxc_state2str(ret));
1983 if (ret != RUNNING)
1984 return false;
1985
1986 return true;
1987 }
1988
1989 WRAP_API_1(bool, lxcapi_reboot2, int)
1990
1991 static bool do_lxcapi_shutdown(struct lxc_container *c, int timeout)
1992 {
1993 int killret, ret;
1994 pid_t pid;
1995 int haltsignal = SIGPWR, state_client_fd = -EBADF;
1996 lxc_state_t states[MAX_STATE] = {0};
1997
1998 if (!c)
1999 return false;
2000
2001 if (!do_lxcapi_is_running(c))
2002 return true;
2003
2004 pid = do_lxcapi_init_pid(c);
2005 if (pid <= 0)
2006 return true;
2007
2008 /* Detect whether we should send SIGRTMIN + 3 (e.g. systemd). */
2009 if (c->lxc_conf && c->lxc_conf->haltsignal)
2010 haltsignal = c->lxc_conf->haltsignal;
2011 else if (task_blocking_signal(pid, (SIGRTMIN + 3)))
2012 haltsignal = (SIGRTMIN + 3);
2013
2014 /* Add a new state client before sending the shutdown signal so that we
2015 * don't miss a state.
2016 */
2017 if (timeout != 0) {
2018 states[STOPPED] = 1;
2019 ret = lxc_cmd_add_state_client(c->name, c->config_path, states,
2020 &state_client_fd);
2021 if (ret < 0)
2022 return false;
2023
2024 if (state_client_fd < 0)
2025 return false;
2026
2027 if (ret == STOPPED)
2028 return true;
2029
2030 if (ret < MAX_STATE)
2031 return false;
2032 }
2033
2034 /* Send shutdown signal to container. */
2035 killret = kill(pid, haltsignal);
2036 if (killret < 0) {
2037 if (state_client_fd >= 0)
2038 close(state_client_fd);
2039 WARN("Failed to send signal %d to pid %d", haltsignal, pid);
2040 return false;
2041 }
2042 TRACE("Sent signal %d to pid %d", haltsignal, pid);
2043
2044 if (timeout == 0) {
2045 if (state_client_fd >= 0)
2046 close(state_client_fd);
2047 return true;
2048 }
2049
2050 ret = lxc_cmd_sock_rcv_state(state_client_fd, timeout);
2051 close(state_client_fd);
2052 if (ret < 0)
2053 return false;
2054
2055 TRACE("Received state \"%s\"", lxc_state2str(ret));
2056 if (ret != STOPPED)
2057 return false;
2058
2059 return true;
2060 }
2061
2062 WRAP_API_1(bool, lxcapi_shutdown, int)
2063
2064 static bool lxcapi_createl(struct lxc_container *c, const char *t,
2065 const char *bdevtype, struct bdev_specs *specs, int flags, ...)
2066 {
2067 bool bret = false;
2068 char **args = NULL;
2069 va_list ap;
2070
2071 if (!c)
2072 return false;
2073
2074 current_config = c->lxc_conf;
2075
2076 /*
2077 * since we're going to wait for create to finish, I don't think we
2078 * need to get a copy of the arguments.
2079 */
2080 va_start(ap, flags);
2081 args = lxc_va_arg_list_to_argv(ap, 0, 0);
2082 va_end(ap);
2083 if (!args) {
2084 ERROR("Failed to allocate memory");
2085 goto out;
2086 }
2087
2088 bret = do_lxcapi_create(c, t, bdevtype, specs, flags, args);
2089
2090 out:
2091 free(args);
2092 current_config = NULL;
2093 return bret;
2094 }
2095
2096 static void do_clear_unexp_config_line(struct lxc_conf *conf, const char *key)
2097 {
2098 if (!strcmp(key, "lxc.cgroup"))
2099 return clear_unexp_config_line(conf, key, true);
2100
2101 if (!strcmp(key, "lxc.network"))
2102 return clear_unexp_config_line(conf, key, true);
2103
2104 if (!strcmp(key, "lxc.net"))
2105 return clear_unexp_config_line(conf, key, true);
2106
2107 /* Clear a network with a specific index. */
2108 if (!strncmp(key, "lxc.net.", 8)) {
2109 int ret;
2110 const char *idx;
2111
2112 idx = key + 8;
2113 ret = lxc_safe_uint(idx, &(unsigned int){0});
2114 if (!ret)
2115 return clear_unexp_config_line(conf, key, true);
2116 }
2117
2118 if (!strcmp(key, "lxc.hook"))
2119 return clear_unexp_config_line(conf, key, true);
2120
2121 return clear_unexp_config_line(conf, key, false);
2122 }
2123
2124 static bool do_lxcapi_clear_config_item(struct lxc_container *c,
2125 const char *key)
2126 {
2127 int ret = 1;
2128 struct lxc_config_t *config;
2129
2130 if (!c || !c->lxc_conf)
2131 return false;
2132
2133 if (container_mem_lock(c))
2134 return false;
2135
2136 config = lxc_get_config(key);
2137 /* Verify that the config key exists and that it has a callback
2138 * implemented.
2139 */
2140 if (config && config->clr)
2141 ret = config->clr(key, c->lxc_conf, NULL);
2142 if (!ret)
2143 do_clear_unexp_config_line(c->lxc_conf, key);
2144
2145 container_mem_unlock(c);
2146 return ret == 0;
2147 }
2148
2149 WRAP_API_1(bool, lxcapi_clear_config_item, const char *)
2150
2151 static inline bool enter_net_ns(struct lxc_container *c)
2152 {
2153 pid_t pid = do_lxcapi_init_pid(c);
2154
2155 if ((geteuid() != 0 || (c->lxc_conf && !lxc_list_empty(&c->lxc_conf->id_map))) && access("/proc/self/ns/user", F_OK) == 0) {
2156 if (!switch_to_ns(pid, "user"))
2157 return false;
2158 }
2159 return switch_to_ns(pid, "net");
2160 }
2161
2162 /* Used by qsort and bsearch functions for comparing names. */
2163 static inline int string_cmp(char **first, char **second)
2164 {
2165 return strcmp(*first, *second);
2166 }
2167
2168 /* Used by qsort and bsearch functions for comparing container names. */
2169 static inline int container_cmp(struct lxc_container **first,
2170 struct lxc_container **second)
2171 {
2172 return strcmp((*first)->name, (*second)->name);
2173 }
2174
2175 static bool add_to_array(char ***names, char *cname, int pos)
2176 {
2177 char **newnames = realloc(*names, (pos+1) * sizeof(char *));
2178 if (!newnames) {
2179 ERROR("Out of memory");
2180 return false;
2181 }
2182
2183 *names = newnames;
2184 newnames[pos] = strdup(cname);
2185 if (!newnames[pos])
2186 return false;
2187
2188 /* Sort the arrray as we will use binary search on it. */
2189 qsort(newnames, pos + 1, sizeof(char *),
2190 (int (*)(const void *, const void *))string_cmp);
2191
2192 return true;
2193 }
2194
2195 static bool add_to_clist(struct lxc_container ***list, struct lxc_container *c,
2196 int pos, bool sort)
2197 {
2198 struct lxc_container **newlist = realloc(*list, (pos + 1) * sizeof(struct lxc_container *));
2199 if (!newlist) {
2200 ERROR("Out of memory");
2201 return false;
2202 }
2203
2204 *list = newlist;
2205 newlist[pos] = c;
2206
2207 /* Sort the arrray as we will use binary search on it. */
2208 if (sort)
2209 qsort(newlist, pos + 1, sizeof(struct lxc_container *),
2210 (int (*)(const void *, const void *))container_cmp);
2211
2212 return true;
2213 }
2214
2215 static char** get_from_array(char ***names, char *cname, int size)
2216 {
2217 return (char **)bsearch(&cname, *names, size, sizeof(char *), (int (*)(const void *, const void *))string_cmp);
2218 }
2219
2220
2221 static bool array_contains(char ***names, char *cname, int size) {
2222 if(get_from_array(names, cname, size) != NULL)
2223 return true;
2224 return false;
2225 }
2226
2227 static bool remove_from_array(char ***names, char *cname, int size)
2228 {
2229 char **result = get_from_array(names, cname, size);
2230 if (result != NULL) {
2231 free(result);
2232 return true;
2233 }
2234 return false;
2235 }
2236
2237 static char ** do_lxcapi_get_interfaces(struct lxc_container *c)
2238 {
2239 pid_t pid;
2240 int i, count = 0, pipefd[2];
2241 char **interfaces = NULL;
2242 char interface[IFNAMSIZ];
2243
2244 if(pipe(pipefd) < 0) {
2245 SYSERROR("pipe failed");
2246 return NULL;
2247 }
2248
2249 pid = fork();
2250 if (pid < 0) {
2251 SYSERROR("failed to fork task to get interfaces information");
2252 close(pipefd[0]);
2253 close(pipefd[1]);
2254 return NULL;
2255 }
2256
2257 if (pid == 0) { /* child */
2258 int ret = 1, nbytes;
2259 struct ifaddrs *interfaceArray = NULL, *tempIfAddr = NULL;
2260
2261 /* close the read-end of the pipe */
2262 close(pipefd[0]);
2263
2264 if (!enter_net_ns(c)) {
2265 SYSERROR("failed to enter namespace");
2266 goto out;
2267 }
2268
2269 /* Grab the list of interfaces */
2270 if (getifaddrs(&interfaceArray)) {
2271 SYSERROR("failed to get interfaces list");
2272 goto out;
2273 }
2274
2275 /* Iterate through the interfaces */
2276 for (tempIfAddr = interfaceArray; tempIfAddr != NULL; tempIfAddr = tempIfAddr->ifa_next) {
2277 nbytes = write(pipefd[1], tempIfAddr->ifa_name, IFNAMSIZ);
2278 if (nbytes < 0) {
2279 ERROR("write failed");
2280 goto out;
2281 }
2282 count++;
2283 }
2284 ret = 0;
2285
2286 out:
2287 if (interfaceArray)
2288 freeifaddrs(interfaceArray);
2289
2290 /* close the write-end of the pipe, thus sending EOF to the reader */
2291 close(pipefd[1]);
2292 _exit(ret);
2293 }
2294
2295 /* close the write-end of the pipe */
2296 close(pipefd[1]);
2297
2298 while (read(pipefd[0], &interface, IFNAMSIZ) == IFNAMSIZ) {
2299 interface[IFNAMSIZ - 1] = '\0';
2300
2301 if (array_contains(&interfaces, interface, count))
2302 continue;
2303
2304 if(!add_to_array(&interfaces, interface, count))
2305 ERROR("Failed to add \"%s\" to array", interface);
2306
2307 count++;
2308 }
2309
2310 if (wait_for_pid(pid) != 0) {
2311 for(i=0;i<count;i++)
2312 free(interfaces[i]);
2313 free(interfaces);
2314 interfaces = NULL;
2315 }
2316
2317 /* close the read-end of the pipe */
2318 close(pipefd[0]);
2319
2320 /* Append NULL to the array */
2321 if(interfaces)
2322 interfaces = (char **)lxc_append_null_to_array((void **)interfaces, count);
2323
2324 return interfaces;
2325 }
2326
2327 WRAP_API(char **, lxcapi_get_interfaces)
2328
2329 static char** do_lxcapi_get_ips(struct lxc_container *c, const char* interface, const char* family, int scope)
2330 {
2331 pid_t pid;
2332 int i, count = 0, pipefd[2];
2333 char **addresses = NULL;
2334 char address[INET6_ADDRSTRLEN];
2335
2336 if(pipe(pipefd) < 0) {
2337 SYSERROR("pipe failed");
2338 return NULL;
2339 }
2340
2341 pid = fork();
2342 if (pid < 0) {
2343 SYSERROR("failed to fork task to get container ips");
2344 close(pipefd[0]);
2345 close(pipefd[1]);
2346 return NULL;
2347 }
2348
2349 if (pid == 0) { /* child */
2350 int ret = 1, nbytes;
2351 struct ifaddrs *interfaceArray = NULL, *tempIfAddr = NULL;
2352 char addressOutputBuffer[INET6_ADDRSTRLEN];
2353 void *tempAddrPtr = NULL;
2354 char *address = NULL;
2355
2356 /* close the read-end of the pipe */
2357 close(pipefd[0]);
2358
2359 if (!enter_net_ns(c)) {
2360 SYSERROR("failed to enter namespace");
2361 goto out;
2362 }
2363
2364 /* Grab the list of interfaces */
2365 if (getifaddrs(&interfaceArray)) {
2366 SYSERROR("failed to get interfaces list");
2367 goto out;
2368 }
2369
2370 /* Iterate through the interfaces */
2371 for (tempIfAddr = interfaceArray; tempIfAddr != NULL; tempIfAddr = tempIfAddr->ifa_next) {
2372 if (tempIfAddr->ifa_addr == NULL)
2373 continue;
2374
2375 if(tempIfAddr->ifa_addr->sa_family == AF_INET) {
2376 if (family && strcmp(family, "inet"))
2377 continue;
2378 tempAddrPtr = &((struct sockaddr_in *)tempIfAddr->ifa_addr)->sin_addr;
2379 }
2380 else {
2381 if (family && strcmp(family, "inet6"))
2382 continue;
2383
2384 if (((struct sockaddr_in6 *)tempIfAddr->ifa_addr)->sin6_scope_id != scope)
2385 continue;
2386
2387 tempAddrPtr = &((struct sockaddr_in6 *)tempIfAddr->ifa_addr)->sin6_addr;
2388 }
2389
2390 if (interface && strcmp(interface, tempIfAddr->ifa_name))
2391 continue;
2392 else if (!interface && strcmp("lo", tempIfAddr->ifa_name) == 0)
2393 continue;
2394
2395 address = (char *)inet_ntop(tempIfAddr->ifa_addr->sa_family,
2396 tempAddrPtr,
2397 addressOutputBuffer,
2398 sizeof(addressOutputBuffer));
2399 if (!address)
2400 continue;
2401
2402 nbytes = write(pipefd[1], address, INET6_ADDRSTRLEN);
2403 if (nbytes < 0) {
2404 ERROR("write failed");
2405 goto out;
2406 }
2407 count++;
2408 }
2409 ret = 0;
2410
2411 out:
2412 if(interfaceArray)
2413 freeifaddrs(interfaceArray);
2414
2415 /* close the write-end of the pipe, thus sending EOF to the reader */
2416 close(pipefd[1]);
2417 _exit(ret);
2418 }
2419
2420 /* close the write-end of the pipe */
2421 close(pipefd[1]);
2422
2423 while (read(pipefd[0], &address, INET6_ADDRSTRLEN) == INET6_ADDRSTRLEN) {
2424 if(!add_to_array(&addresses, address, count))
2425 ERROR("PARENT: add_to_array failed");
2426 count++;
2427 }
2428
2429 if (wait_for_pid(pid) != 0) {
2430 for(i=0;i<count;i++)
2431 free(addresses[i]);
2432 free(addresses);
2433 addresses = NULL;
2434 }
2435
2436 /* close the read-end of the pipe */
2437 close(pipefd[0]);
2438
2439 /* Append NULL to the array */
2440 if(addresses)
2441 addresses = (char **)lxc_append_null_to_array((void **)addresses, count);
2442
2443 return addresses;
2444 }
2445
2446 WRAP_API_3(char **, lxcapi_get_ips, const char *, const char *, int)
2447
2448 static int do_lxcapi_get_config_item(struct lxc_container *c, const char *key, char *retv, int inlen)
2449 {
2450 int ret = -1;
2451 struct lxc_config_t *config;
2452
2453 if (!c || !c->lxc_conf)
2454 return -1;
2455
2456 if (container_mem_lock(c))
2457 return -1;
2458
2459 config = lxc_get_config(key);
2460 /* Verify that the config key exists and that it has a callback
2461 * implemented.
2462 */
2463 if (config && config->get)
2464 ret = config->get(key, retv, inlen, c->lxc_conf, NULL);
2465
2466 container_mem_unlock(c);
2467 return ret;
2468 }
2469
2470 WRAP_API_3(int, lxcapi_get_config_item, const char *, char *, int)
2471
2472 static char* do_lxcapi_get_running_config_item(struct lxc_container *c, const char *key)
2473 {
2474 char *ret;
2475
2476 if (!c || !c->lxc_conf)
2477 return NULL;
2478 if (container_mem_lock(c))
2479 return NULL;
2480 ret = lxc_cmd_get_config_item(c->name, key, do_lxcapi_get_config_path(c));
2481 container_mem_unlock(c);
2482 return ret;
2483 }
2484
2485 WRAP_API_1(char *, lxcapi_get_running_config_item, const char *)
2486
2487 static int do_lxcapi_get_keys(struct lxc_container *c, const char *key, char *retv, int inlen)
2488 {
2489 int ret = -1;
2490
2491 /* List all config items. */
2492 if (!key)
2493 return lxc_list_config_items(retv, inlen);
2494
2495 if (!c || !c->lxc_conf)
2496 return -1;
2497
2498 if (container_mem_lock(c))
2499 return -1;
2500
2501 /* Support 'lxc.net.<idx>', i.e. 'lxc.net.0'
2502 * This is an intelligent result to show which keys are valid given the
2503 * type of nic it is.
2504 */
2505 if (strncmp(key, "lxc.net.", 8) == 0)
2506 ret = lxc_list_net(c->lxc_conf, key, retv, inlen);
2507 else
2508 ret = lxc_list_subkeys(c->lxc_conf, key, retv, inlen);
2509
2510 container_mem_unlock(c);
2511 return ret;
2512 }
2513
2514 WRAP_API_3(int, lxcapi_get_keys, const char *, char *, int)
2515
2516 static bool do_lxcapi_save_config(struct lxc_container *c, const char *alt_file)
2517 {
2518 int fd, lret;
2519 bool ret = false, need_disklock = false;
2520
2521 if (!alt_file)
2522 alt_file = c->configfile;
2523 if (!alt_file)
2524 return false;
2525
2526 /* If we haven't yet loaded a config, load the stock config. */
2527 if (!c->lxc_conf) {
2528 if (!do_lxcapi_load_config(c, lxc_global_config_value("lxc.default_config"))) {
2529 ERROR("Error loading default configuration file %s "
2530 "while saving %s",
2531 lxc_global_config_value("lxc.default_config"),
2532 c->name);
2533 return false;
2534 }
2535 }
2536
2537 if (!create_container_dir(c))
2538 return false;
2539
2540 /* If we're writing to the container's config file, take the disk lock.
2541 * Otherwise just take the memlock to protect the struct lxc_container
2542 * while we're traversing it.
2543 */
2544 if (strcmp(c->configfile, alt_file) == 0)
2545 need_disklock = true;
2546
2547 if (need_disklock)
2548 lret = container_disk_lock(c);
2549 else
2550 lret = container_mem_lock(c);
2551 if (lret)
2552 return false;
2553
2554 fd = open(alt_file, O_WRONLY | O_CREAT | O_TRUNC | O_CLOEXEC,
2555 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
2556 if (fd < 0)
2557 goto on_error;
2558
2559 lret = write_config(fd, c->lxc_conf);
2560 close(fd);
2561 if (lret < 0)
2562 goto on_error;
2563
2564 ret = true;
2565
2566 on_error:
2567 if (need_disklock)
2568 container_disk_unlock(c);
2569 else
2570 container_mem_unlock(c);
2571
2572 return ret;
2573 }
2574
2575 WRAP_API_1(bool, lxcapi_save_config, const char *)
2576
2577
2578 static bool mod_rdep(struct lxc_container *c0, struct lxc_container *c, bool inc)
2579 {
2580 FILE *f1;
2581 struct stat fbuf;
2582 void *buf = NULL;
2583 char *del = NULL;
2584 char path[MAXPATHLEN];
2585 char newpath[MAXPATHLEN];
2586 int fd, ret, n = 0, v = 0;
2587 bool bret = false;
2588 size_t len = 0, bytes = 0;
2589
2590 if (container_disk_lock(c0))
2591 return false;
2592
2593 ret = snprintf(path, MAXPATHLEN, "%s/%s/lxc_snapshots", c0->config_path, c0->name);
2594 if (ret < 0 || ret > MAXPATHLEN)
2595 goto out;
2596 ret = snprintf(newpath, MAXPATHLEN, "%s\n%s\n", c->config_path, c->name);
2597 if (ret < 0 || ret > MAXPATHLEN)
2598 goto out;
2599
2600 /* If we find an lxc-snapshot file using the old format only listing the
2601 * number of snapshots we will keep using it. */
2602 f1 = fopen(path, "r");
2603 if (f1) {
2604 n = fscanf(f1, "%d", &v);
2605 fclose(f1);
2606 if (n == 1 && v == 0) {
2607 remove(path);
2608 n = 0;
2609 }
2610 }
2611 if (n == 1) {
2612 v += inc ? 1 : -1;
2613 f1 = fopen(path, "w");
2614 if (!f1)
2615 goto out;
2616 if (fprintf(f1, "%d\n", v) < 0) {
2617 ERROR("Error writing new snapshots value");
2618 fclose(f1);
2619 goto out;
2620 }
2621 ret = fclose(f1);
2622 if (ret != 0) {
2623 SYSERROR("Error writing to or closing snapshots file");
2624 goto out;
2625 }
2626 } else {
2627 /* Here we know that we have or can use an lxc-snapshot file
2628 * using the new format. */
2629 if (inc) {
2630 f1 = fopen(path, "a");
2631 if (!f1)
2632 goto out;
2633
2634 if (fprintf(f1, "%s", newpath) < 0) {
2635 ERROR("Error writing new snapshots entry");
2636 ret = fclose(f1);
2637 if (ret != 0)
2638 SYSERROR("Error writing to or closing snapshots file");
2639 goto out;
2640 }
2641
2642 ret = fclose(f1);
2643 if (ret != 0) {
2644 SYSERROR("Error writing to or closing snapshots file");
2645 goto out;
2646 }
2647 } else if (!inc) {
2648 if ((fd = open(path, O_RDWR | O_CLOEXEC)) < 0)
2649 goto out;
2650
2651 if (fstat(fd, &fbuf) < 0) {
2652 close(fd);
2653 goto out;
2654 }
2655
2656 if (fbuf.st_size != 0) {
2657
2658 buf = lxc_strmmap(NULL, fbuf.st_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
2659 if (buf == MAP_FAILED) {
2660 SYSERROR("Failed to create mapping %s", path);
2661 close(fd);
2662 goto out;
2663 }
2664
2665 len = strlen(newpath);
2666 while ((del = strstr((char *)buf, newpath))) {
2667 memmove(del, del + len, strlen(del) - len + 1);
2668 bytes += len;
2669 }
2670
2671 lxc_strmunmap(buf, fbuf.st_size);
2672 if (ftruncate(fd, fbuf.st_size - bytes) < 0) {
2673 SYSERROR("Failed to truncate file %s", path);
2674 close(fd);
2675 goto out;
2676 }
2677 }
2678 close(fd);
2679 }
2680
2681 /* If the lxc-snapshot file is empty, remove it. */
2682 if (stat(path, &fbuf) < 0)
2683 goto out;
2684 if (!fbuf.st_size) {
2685 remove(path);
2686 }
2687 }
2688
2689 bret = true;
2690
2691 out:
2692 container_disk_unlock(c0);
2693 return bret;
2694 }
2695
2696 void mod_all_rdeps(struct lxc_container *c, bool inc)
2697 {
2698 struct lxc_container *p;
2699 char *lxcpath = NULL, *lxcname = NULL, path[MAXPATHLEN];
2700 size_t pathlen = 0, namelen = 0;
2701 FILE *f;
2702 int ret;
2703
2704 ret = snprintf(path, MAXPATHLEN, "%s/%s/lxc_rdepends",
2705 c->config_path, c->name);
2706 if (ret < 0 || ret >= MAXPATHLEN) {
2707 ERROR("Path name too long");
2708 return;
2709 }
2710 f = fopen(path, "r");
2711 if (f == NULL)
2712 return;
2713 while (getline(&lxcpath, &pathlen, f) != -1) {
2714 if (getline(&lxcname, &namelen, f) == -1) {
2715 ERROR("badly formatted file %s", path);
2716 goto out;
2717 }
2718
2719 remove_trailing_newlines(lxcpath);
2720 remove_trailing_newlines(lxcname);
2721
2722 if ((p = lxc_container_new(lxcname, lxcpath)) == NULL) {
2723 ERROR("Unable to find dependent container %s:%s",
2724 lxcpath, lxcname);
2725 continue;
2726 }
2727 if (!mod_rdep(p, c, inc))
2728 ERROR("Failed to update snapshots file for %s:%s",
2729 lxcpath, lxcname);
2730 lxc_container_put(p);
2731 }
2732 out:
2733 free(lxcpath);
2734 free(lxcname);
2735 fclose(f);
2736 }
2737
2738 static bool has_fs_snapshots(struct lxc_container *c)
2739 {
2740 FILE *f;
2741 char path[MAXPATHLEN];
2742 int ret, v;
2743 struct stat fbuf;
2744 bool bret = false;
2745
2746 ret = snprintf(path, MAXPATHLEN, "%s/%s/lxc_snapshots", c->config_path,
2747 c->name);
2748 if (ret < 0 || ret > MAXPATHLEN)
2749 goto out;
2750 /* If the file doesn't exist there are no snapshots. */
2751 if (stat(path, &fbuf) < 0)
2752 goto out;
2753 v = fbuf.st_size;
2754 if (v != 0) {
2755 f = fopen(path, "r");
2756 if (!f)
2757 goto out;
2758 ret = fscanf(f, "%d", &v);
2759 fclose(f);
2760 /* TODO: Figure out what to do with the return value of fscanf. */
2761 if (ret != 1)
2762 INFO("Container uses new lxc-snapshots format %s", path);
2763 }
2764 bret = v != 0;
2765
2766 out:
2767 return bret;
2768 }
2769
2770 static bool has_snapshots(struct lxc_container *c)
2771 {
2772 char path[MAXPATHLEN];
2773 struct dirent *direntp;
2774 int count=0;
2775 DIR *dir;
2776
2777 if (!get_snappath_dir(c, path))
2778 return false;
2779 dir = opendir(path);
2780 if (!dir)
2781 return false;
2782 while ((direntp = readdir(dir))) {
2783 if (!direntp)
2784 break;
2785
2786 if (!strcmp(direntp->d_name, "."))
2787 continue;
2788
2789 if (!strcmp(direntp->d_name, ".."))
2790 continue;
2791 count++;
2792 break;
2793 }
2794 closedir(dir);
2795 return count > 0;
2796 }
2797
2798 static bool do_destroy_container(struct lxc_conf *conf) {
2799 int ret;
2800
2801 if (am_guest_unpriv()) {
2802 ret = userns_exec_full(conf, storage_destroy_wrapper, conf,
2803 "storage_destroy_wrapper");
2804 if (ret < 0)
2805 return false;
2806
2807 return true;
2808 }
2809
2810 return storage_destroy(conf);
2811 }
2812
2813 static int lxc_rmdir_onedev_wrapper(void *data)
2814 {
2815 char *arg = (char *) data;
2816 return lxc_rmdir_onedev(arg, "snaps");
2817 }
2818
2819 static int lxc_unlink_exec_wrapper(void *data)
2820 {
2821 char *arg = data;
2822 return unlink(arg);
2823 }
2824
2825 static bool container_destroy(struct lxc_container *c,
2826 struct lxc_storage *storage)
2827 {
2828 const char *p1;
2829 size_t len;
2830 struct lxc_conf *conf;
2831 char *path = NULL;
2832 bool bret = false;
2833 int ret = 0;
2834
2835 if (!c || !do_lxcapi_is_defined(c))
2836 return false;
2837
2838 conf = c->lxc_conf;
2839 if (container_disk_lock(c))
2840 return false;
2841
2842 if (!is_stopped(c)) {
2843 /* We should queue some sort of error - in c->error_string? */
2844 ERROR("container %s is not stopped", c->name);
2845 goto out;
2846 }
2847
2848 if (conf && !lxc_list_empty(&conf->hooks[LXCHOOK_DESTROY])) {
2849 /* Start of environment variable setup for hooks */
2850 if (setenv("LXC_NAME", c->name, 1))
2851 SYSERROR("Failed to set environment variable for container name");
2852
2853 if (conf->rcfile && setenv("LXC_CONFIG_FILE", conf->rcfile, 1))
2854 SYSERROR("Failed to set environment variable for config path");
2855
2856 if (conf->rootfs.mount && setenv("LXC_ROOTFS_MOUNT", conf->rootfs.mount, 1))
2857 SYSERROR("Failed to set environment variable for rootfs mount");
2858
2859 if (conf->rootfs.path && setenv("LXC_ROOTFS_PATH", conf->rootfs.path, 1))
2860 SYSERROR("Failed to set environment variable for rootfs mount");
2861
2862 if (conf->console.path && setenv("LXC_CONSOLE", conf->console.path, 1))
2863 SYSERROR("Failed to set environment variable for console path");
2864
2865 if (conf->console.log_path && setenv("LXC_CONSOLE_LOGPATH", conf->console.log_path, 1))
2866 SYSERROR("Failed to set environment variable for console log");
2867 /* End of environment variable setup for hooks */
2868
2869 if (run_lxc_hooks(c->name, "destroy", conf, NULL)) {
2870 ERROR("Failed to execute clone hook for \"%s\"", c->name);
2871 goto out;
2872 }
2873 }
2874
2875 if (current_config && conf == current_config) {
2876 current_config = NULL;
2877 if (conf->logfd != -1) {
2878 close(conf->logfd);
2879 conf->logfd = -1;
2880 }
2881 }
2882
2883 if (conf && conf->rootfs.path && conf->rootfs.mount) {
2884 if (!do_destroy_container(conf)) {
2885 ERROR("Error destroying rootfs for %s", c->name);
2886 goto out;
2887 }
2888 INFO("Destroyed rootfs for %s", c->name);
2889 }
2890
2891 mod_all_rdeps(c, false);
2892
2893 p1 = do_lxcapi_get_config_path(c);
2894 /* strlen(p1)
2895 * +
2896 * /
2897 * +
2898 * strlen(c->name)
2899 * +
2900 * /
2901 * +
2902 * strlen("config") = 6
2903 * +
2904 * \0
2905 */
2906 len = strlen(p1) + 1 + strlen(c->name) + 1 + 6 + 1;
2907 path = malloc(len);
2908 if (!path) {
2909 ERROR("Failed to allocate memory");
2910 goto out;
2911 }
2912
2913 /* For an overlay container the rootfs is considered immutable and
2914 * cannot be removed when restoring from a snapshot.
2915 */
2916 if (storage && (!strcmp(storage->type, "overlay") ||
2917 !strcmp(storage->type, "overlayfs")) &&
2918 (storage->flags & LXC_STORAGE_INTERNAL_OVERLAY_RESTORE)) {
2919 ret = snprintf(path, len, "%s/%s/config", p1, c->name);
2920 if (ret < 0 || (size_t)ret >= len)
2921 goto out;
2922
2923 if (am_guest_unpriv())
2924 ret = userns_exec_1(conf, lxc_unlink_exec_wrapper, path,
2925 "lxc_unlink_exec_wrapper");
2926 else
2927 ret = unlink(path);
2928 if (ret < 0) {
2929 SYSERROR("Failed to destroy config file \"%s\" for \"%s\"",
2930 path, c->name);
2931 goto out;
2932 }
2933 INFO("Destroyed config file \"%s\" for \"%s\"", path, c->name);
2934
2935 bret = true;
2936 goto out;
2937 }
2938
2939 ret = snprintf(path, len, "%s/%s", p1, c->name);
2940 if (ret < 0 || (size_t)ret >= len)
2941 goto out;
2942 if (am_guest_unpriv())
2943 ret = userns_exec_full(conf, lxc_rmdir_onedev_wrapper, path,
2944 "lxc_rmdir_onedev_wrapper");
2945 else
2946 ret = lxc_rmdir_onedev(path, "snaps");
2947 if (ret < 0) {
2948 ERROR("Failed to destroy directory \"%s\" for \"%s\"", path,
2949 c->name);
2950 goto out;
2951 }
2952 INFO("Destroyed directory \"%s\" for \"%s\"", path, c->name);
2953
2954 bret = true;
2955
2956 out:
2957 if (path)
2958 free(path);
2959 container_disk_unlock(c);
2960 return bret;
2961 }
2962
2963 static bool do_lxcapi_destroy(struct lxc_container *c)
2964 {
2965 if (!c || !lxcapi_is_defined(c))
2966 return false;
2967
2968 if (has_snapshots(c)) {
2969 ERROR("Container %s has snapshots; not removing", c->name);
2970 return false;
2971 }
2972
2973 if (has_fs_snapshots(c)) {
2974 ERROR("container %s has snapshots on its rootfs", c->name);
2975 return false;
2976 }
2977
2978 return container_destroy(c, NULL);
2979 }
2980
2981 WRAP_API(bool, lxcapi_destroy)
2982
2983 static bool do_lxcapi_destroy_with_snapshots(struct lxc_container *c)
2984 {
2985 if (!c || !lxcapi_is_defined(c))
2986 return false;
2987 if (!lxcapi_snapshot_destroy_all(c)) {
2988 ERROR("Error deleting all snapshots");
2989 return false;
2990 }
2991 return lxcapi_destroy(c);
2992 }
2993
2994 WRAP_API(bool, lxcapi_destroy_with_snapshots)
2995
2996 int lxc_set_config_item_locked(struct lxc_conf *conf, const char *key,
2997 const char *v)
2998 {
2999 int ret;
3000 struct lxc_config_t *config;
3001 bool bret = true;
3002
3003 config = lxc_get_config(key);
3004 if (!config)
3005 return -EINVAL;
3006
3007 ret = config->set(key, v, conf, NULL);
3008 if (ret < 0)
3009 return -EINVAL;
3010
3011 if (lxc_config_value_empty(v))
3012 do_clear_unexp_config_line(conf, key);
3013 else
3014 bret = do_append_unexp_config_line(conf, key, v);
3015 if (!bret)
3016 return -ENOMEM;
3017
3018 return 0;
3019 }
3020
3021 static bool do_set_config_item_locked(struct lxc_container *c, const char *key,
3022 const char *v)
3023 {
3024 int ret;
3025
3026 if (!c->lxc_conf)
3027 c->lxc_conf = lxc_conf_init();
3028
3029 if (!c->lxc_conf)
3030 return false;
3031
3032 ret = lxc_set_config_item_locked(c->lxc_conf, key, v);
3033 if (ret < 0)
3034 return false;
3035
3036 return true;
3037 }
3038
3039 static bool do_lxcapi_set_config_item(struct lxc_container *c, const char *key, const char *v)
3040 {
3041 bool b = false;
3042
3043 if (!c)
3044 return false;
3045
3046 if (container_mem_lock(c))
3047 return false;
3048
3049 b = do_set_config_item_locked(c, key, v);
3050
3051 container_mem_unlock(c);
3052 return b;
3053 }
3054
3055 WRAP_API_2(bool, lxcapi_set_config_item, const char *, const char *)
3056
3057 static char *lxcapi_config_file_name(struct lxc_container *c)
3058 {
3059 if (!c || !c->configfile)
3060 return NULL;
3061 return strdup(c->configfile);
3062 }
3063
3064 static const char *lxcapi_get_config_path(struct lxc_container *c)
3065 {
3066 if (!c || !c->config_path)
3067 return NULL;
3068 return (const char *)(c->config_path);
3069 }
3070
3071 /*
3072 * not for export
3073 * Just recalculate the c->configfile based on the
3074 * c->config_path, which must be set.
3075 * The lxc_container must be locked or not yet public.
3076 */
3077 static bool set_config_filename(struct lxc_container *c)
3078 {
3079 char *newpath;
3080 int len, ret;
3081
3082 if (!c->config_path)
3083 return false;
3084
3085 /* $lxc_path + "/" + c->name + "/" + "config" + '\0' */
3086 len = strlen(c->config_path) + strlen(c->name) + strlen("config") + 3;
3087 newpath = malloc(len);
3088 if (!newpath)
3089 return false;
3090
3091 ret = snprintf(newpath, len, "%s/%s/config", c->config_path, c->name);
3092 if (ret < 0 || ret >= len) {
3093 fprintf(stderr, "Error printing out config file name\n");
3094 free(newpath);
3095 return false;
3096 }
3097
3098 free(c->configfile);
3099 c->configfile = newpath;
3100
3101 return true;
3102 }
3103
3104 static bool do_lxcapi_set_config_path(struct lxc_container *c, const char *path)
3105 {
3106 char *p;
3107 bool b = false;
3108 char *oldpath = NULL;
3109
3110 if (!c)
3111 return b;
3112
3113 if (container_mem_lock(c))
3114 return b;
3115
3116 p = strdup(path);
3117 if (!p) {
3118 ERROR("Out of memory setting new lxc path");
3119 goto err;
3120 }
3121
3122 b = true;
3123 if (c->config_path)
3124 oldpath = c->config_path;
3125 c->config_path = p;
3126
3127 /* Since we've changed the config path, we have to change the
3128 * config file name too */
3129 if (!set_config_filename(c)) {
3130 ERROR("Out of memory setting new config filename");
3131 b = false;
3132 free(c->config_path);
3133 c->config_path = oldpath;
3134 oldpath = NULL;
3135 }
3136 err:
3137 free(oldpath);
3138 container_mem_unlock(c);
3139 return b;
3140 }
3141
3142 WRAP_API_1(bool, lxcapi_set_config_path, const char *)
3143
3144 static bool do_lxcapi_set_cgroup_item(struct lxc_container *c, const char *subsys, const char *value)
3145 {
3146 int ret;
3147 struct cgroup_ops *cgroup_ops;
3148
3149 if (!c)
3150 return false;
3151
3152 if (is_stopped(c))
3153 return false;
3154
3155 cgroup_ops = cgroup_init(NULL);
3156 if (!cgroup_ops)
3157 return false;
3158
3159 if (container_disk_lock(c))
3160 return false;
3161
3162 ret = cgroup_ops->set(cgroup_ops, subsys, value, c->name, c->config_path);
3163
3164 container_disk_unlock(c);
3165
3166 cgroup_exit(cgroup_ops);
3167
3168 return ret == 0;
3169 }
3170
3171 WRAP_API_2(bool, lxcapi_set_cgroup_item, const char *, const char *)
3172
3173 static int do_lxcapi_get_cgroup_item(struct lxc_container *c, const char *subsys, char *retv, int inlen)
3174 {
3175 int ret;
3176 struct cgroup_ops *cgroup_ops;
3177
3178 if (!c)
3179 return -1;
3180
3181 if (is_stopped(c))
3182 return -1;
3183
3184 cgroup_ops = cgroup_init(NULL);
3185 if (!cgroup_ops)
3186 return -1;
3187
3188 if (container_disk_lock(c))
3189 return -1;
3190
3191 ret = cgroup_ops->get(cgroup_ops, subsys, retv, inlen, c->name,
3192 c->config_path);
3193
3194 container_disk_unlock(c);
3195
3196 cgroup_exit(cgroup_ops);
3197
3198 return ret;
3199 }
3200
3201 WRAP_API_3(int, lxcapi_get_cgroup_item, const char *, char *, int)
3202
3203 const char *lxc_get_global_config_item(const char *key)
3204 {
3205 return lxc_global_config_value(key);
3206 }
3207
3208 const char *lxc_get_version(void)
3209 {
3210 return LXC_VERSION;
3211 }
3212
3213 static int copy_file(const char *old, const char *new)
3214 {
3215 int in, out;
3216 ssize_t len, ret;
3217 char buf[8096];
3218 struct stat sbuf;
3219
3220 if (file_exists(new)) {
3221 ERROR("copy destination %s exists", new);
3222 return -1;
3223 }
3224 ret = stat(old, &sbuf);
3225 if (ret < 0) {
3226 INFO("Error stat'ing %s", old);
3227 return -1;
3228 }
3229
3230 in = open(old, O_RDONLY);
3231 if (in < 0) {
3232 SYSERROR("Error opening original file %s", old);
3233 return -1;
3234 }
3235 out = open(new, O_CREAT | O_EXCL | O_WRONLY, 0644);
3236 if (out < 0) {
3237 SYSERROR("Error opening new file %s", new);
3238 close(in);
3239 return -1;
3240 }
3241
3242 while (1) {
3243 len = read(in, buf, 8096);
3244 if (len < 0) {
3245 SYSERROR("Error reading old file %s", old);
3246 goto err;
3247 }
3248 if (len == 0)
3249 break;
3250 ret = write(out, buf, len);
3251 if (ret < len) { /* should we retry? */
3252 SYSERROR("Error: write to new file %s was interrupted", new);
3253 goto err;
3254 }
3255 }
3256 close(in);
3257 close(out);
3258
3259 /* We set mode, but not owner/group. */
3260 ret = chmod(new, sbuf.st_mode);
3261 if (ret) {
3262 SYSERROR("Error setting mode on %s", new);
3263 return -1;
3264 }
3265
3266 return 0;
3267
3268 err:
3269 close(in);
3270 close(out);
3271 return -1;
3272 }
3273
3274 static int copyhooks(struct lxc_container *oldc, struct lxc_container *c)
3275 {
3276 int i, len, ret;
3277 struct lxc_list *it;
3278 char *cpath;
3279
3280 len = strlen(oldc->config_path) + strlen(oldc->name) + 3;
3281 cpath = alloca(len);
3282 ret = snprintf(cpath, len, "%s/%s/", oldc->config_path, oldc->name);
3283 if (ret < 0 || ret >= len)
3284 return -1;
3285
3286 for (i=0; i<NUM_LXC_HOOKS; i++) {
3287 lxc_list_for_each(it, &c->lxc_conf->hooks[i]) {
3288 char *hookname = it->elem;
3289 char *fname = strrchr(hookname, '/');
3290 char tmppath[MAXPATHLEN];
3291 if (!fname) /* relative path - we don't support, but maybe we should */
3292 return 0;
3293 if (strncmp(hookname, cpath, len - 1) != 0) {
3294 /* this hook is public - ignore */
3295 continue;
3296 }
3297 /* copy the script, and change the entry in confile */
3298 ret = snprintf(tmppath, MAXPATHLEN, "%s/%s/%s",
3299 c->config_path, c->name, fname+1);
3300 if (ret < 0 || ret >= MAXPATHLEN)
3301 return -1;
3302 ret = copy_file(it->elem, tmppath);
3303 if (ret < 0)
3304 return -1;
3305 free(it->elem);
3306 it->elem = strdup(tmppath);
3307 if (!it->elem) {
3308 ERROR("out of memory copying hook path");
3309 return -1;
3310 }
3311 }
3312 }
3313
3314 if (!clone_update_unexp_hooks(c->lxc_conf, oldc->config_path,
3315 c->config_path, oldc->name, c->name)) {
3316 ERROR("Error saving new hooks in clone");
3317 return -1;
3318 }
3319 do_lxcapi_save_config(c, NULL);
3320 return 0;
3321 }
3322
3323
3324 static int copy_fstab(struct lxc_container *oldc, struct lxc_container *c)
3325 {
3326 char newpath[MAXPATHLEN];
3327 char *oldpath = oldc->lxc_conf->fstab;
3328 int ret;
3329
3330 if (!oldpath)
3331 return 0;
3332
3333 clear_unexp_config_line(c->lxc_conf, "lxc.mount.fstab", false);
3334
3335 char *p = strrchr(oldpath, '/');
3336 if (!p)
3337 return -1;
3338 ret = snprintf(newpath, MAXPATHLEN, "%s/%s%s",
3339 c->config_path, c->name, p);
3340 if (ret < 0 || ret >= MAXPATHLEN) {
3341 ERROR("error printing new path for %s", oldpath);
3342 return -1;
3343 }
3344 if (file_exists(newpath)) {
3345 ERROR("error: fstab file %s exists", newpath);
3346 return -1;
3347 }
3348
3349 if (copy_file(oldpath, newpath) < 0) {
3350 ERROR("error: copying %s to %s", oldpath, newpath);
3351 return -1;
3352 }
3353 free(c->lxc_conf->fstab);
3354 c->lxc_conf->fstab = strdup(newpath);
3355 if (!c->lxc_conf->fstab) {
3356 ERROR("error: allocating pathname");
3357 return -1;
3358 }
3359 if (!do_append_unexp_config_line(c->lxc_conf, "lxc.mount.fstab", newpath)) {
3360 ERROR("error saving new lxctab");
3361 return -1;
3362 }
3363
3364 return 0;
3365 }
3366
3367 static void copy_rdepends(struct lxc_container *c, struct lxc_container *c0)
3368 {
3369 char path0[MAXPATHLEN], path1[MAXPATHLEN];
3370 int ret;
3371
3372 ret = snprintf(path0, MAXPATHLEN, "%s/%s/lxc_rdepends", c0->config_path,
3373 c0->name);
3374 if (ret < 0 || ret >= MAXPATHLEN) {
3375 WARN("Error copying reverse dependencies");
3376 return;
3377 }
3378 ret = snprintf(path1, MAXPATHLEN, "%s/%s/lxc_rdepends", c->config_path,
3379 c->name);
3380 if (ret < 0 || ret >= MAXPATHLEN) {
3381 WARN("Error copying reverse dependencies");
3382 return;
3383 }
3384 if (copy_file(path0, path1) < 0) {
3385 INFO("Error copying reverse dependencies");
3386 return;
3387 }
3388 }
3389
3390 static bool add_rdepends(struct lxc_container *c, struct lxc_container *c0)
3391 {
3392 int ret;
3393 char path[MAXPATHLEN];
3394 FILE *f;
3395 bool bret;
3396
3397 ret = snprintf(path, MAXPATHLEN, "%s/%s/lxc_rdepends", c->config_path,
3398 c->name);
3399 if (ret < 0 || ret >= MAXPATHLEN)
3400 return false;
3401 f = fopen(path, "a");
3402 if (!f)
3403 return false;
3404 bret = true;
3405 /* If anything goes wrong, just return an error. */
3406 if (fprintf(f, "%s\n%s\n", c0->config_path, c0->name) < 0)
3407 bret = false;
3408 if (fclose(f) != 0)
3409 bret = false;
3410 return bret;
3411 }
3412
3413 /*
3414 * If the fs natively supports snapshot clones with no penalty,
3415 * then default to those even if not requested.
3416 * Currently we only do this for btrfs.
3417 */
3418 bool should_default_to_snapshot(struct lxc_container *c0,
3419 struct lxc_container *c1)
3420 {
3421 size_t l0 = strlen(c0->config_path) + strlen(c0->name) + 2;
3422 size_t l1 = strlen(c1->config_path) + strlen(c1->name) + 2;
3423 char *p0 = alloca(l0 + 1);
3424 char *p1 = alloca(l1 + 1);
3425 char *rootfs = c0->lxc_conf->rootfs.path;
3426
3427 snprintf(p0, l0, "%s/%s", c0->config_path, c0->name);
3428 snprintf(p1, l1, "%s/%s", c1->config_path, c1->name);
3429
3430 if (!is_btrfs_fs(p0) || !is_btrfs_fs(p1))
3431 return false;
3432
3433 if (is_btrfs_subvol(rootfs) <= 0)
3434 return false;
3435
3436 return btrfs_same_fs(p0, p1) == 0;
3437 }
3438
3439 static int copy_storage(struct lxc_container *c0, struct lxc_container *c,
3440 const char *newtype, int flags, const char *bdevdata,
3441 uint64_t newsize)
3442 {
3443 struct lxc_storage *bdev;
3444 bool need_rdep;
3445
3446 if (should_default_to_snapshot(c0, c))
3447 flags |= LXC_CLONE_SNAPSHOT;
3448
3449 bdev = storage_copy(c0, c->name, c->config_path, newtype, flags,
3450 bdevdata, newsize, &need_rdep);
3451 if (!bdev) {
3452 ERROR("Error copying storage.");
3453 return -1;
3454 }
3455
3456 /* Set new rootfs. */
3457 free(c->lxc_conf->rootfs.path);
3458 c->lxc_conf->rootfs.path = strdup(bdev->src);
3459 storage_put(bdev);
3460
3461 if (!c->lxc_conf->rootfs.path) {
3462 ERROR("Out of memory while setting storage path.");
3463 return -1;
3464 }
3465
3466 /* Append a new lxc.rootfs.path entry to the unexpanded config. */
3467 clear_unexp_config_line(c->lxc_conf, "lxc.rootfs.path", false);
3468 if (!do_append_unexp_config_line(c->lxc_conf, "lxc.rootfs.path",
3469 c->lxc_conf->rootfs.path)) {
3470 ERROR("Error saving new rootfs to cloned config.");
3471 return -1;
3472 }
3473
3474 if (flags & LXC_CLONE_SNAPSHOT)
3475 copy_rdepends(c, c0);
3476 if (need_rdep) {
3477 if (!add_rdepends(c, c0))
3478 WARN("Error adding reverse dependency from %s to %s",
3479 c->name, c0->name);
3480 }
3481
3482 mod_all_rdeps(c, true);
3483
3484 return 0;
3485 }
3486
3487 struct clone_update_data {
3488 struct lxc_container *c0;
3489 struct lxc_container *c1;
3490 int flags;
3491 char **hookargs;
3492 };
3493
3494 static int clone_update_rootfs(struct clone_update_data *data)
3495 {
3496 struct lxc_container *c0 = data->c0;
3497 struct lxc_container *c = data->c1;
3498 int flags = data->flags;
3499 char **hookargs = data->hookargs;
3500 int ret = -1;
3501 char path[MAXPATHLEN];
3502 struct lxc_storage *bdev;
3503 FILE *fout;
3504 struct lxc_conf *conf = c->lxc_conf;
3505
3506 /* update hostname in rootfs */
3507 /* we're going to mount, so run in a clean namespace to simplify cleanup */
3508
3509 if (setgid(0) < 0) {
3510 ERROR("Failed to setgid to 0");
3511 return -1;
3512 }
3513 if (setuid(0) < 0) {
3514 ERROR("Failed to setuid to 0");
3515 return -1;
3516 }
3517 if (setgroups(0, NULL) < 0)
3518 WARN("Failed to clear groups");
3519
3520 if (unshare(CLONE_NEWNS) < 0)
3521 return -1;
3522 bdev = storage_init(c->lxc_conf);
3523 if (!bdev)
3524 return -1;
3525 if (strcmp(bdev->type, "dir") != 0) {
3526 if (unshare(CLONE_NEWNS) < 0) {
3527 ERROR("error unsharing mounts");
3528 storage_put(bdev);
3529 return -1;
3530 }
3531 if (detect_shared_rootfs()) {
3532 if (mount(NULL, "/", NULL, MS_SLAVE|MS_REC, NULL)) {
3533 SYSERROR("Failed to make / rslave");
3534 ERROR("Continuing...");
3535 }
3536 }
3537 if (bdev->ops->mount(bdev) < 0) {
3538 storage_put(bdev);
3539 return -1;
3540 }
3541 } else { /* TODO come up with a better way */
3542 free(bdev->dest);
3543 bdev->dest = strdup(bdev->src);
3544 }
3545
3546 if (!lxc_list_empty(&conf->hooks[LXCHOOK_CLONE])) {
3547 /* Start of environment variable setup for hooks */
3548 if (c0->name && setenv("LXC_SRC_NAME", c0->name, 1)) {
3549 SYSERROR("failed to set environment variable for source container name");
3550 }
3551 if (setenv("LXC_NAME", c->name, 1)) {
3552 SYSERROR("failed to set environment variable for container name");
3553 }
3554 if (conf->rcfile && setenv("LXC_CONFIG_FILE", conf->rcfile, 1)) {
3555 SYSERROR("failed to set environment variable for config path");
3556 }
3557 if (bdev->dest && setenv("LXC_ROOTFS_MOUNT", bdev->dest, 1)) {
3558 SYSERROR("failed to set environment variable for rootfs mount");
3559 }
3560 if (conf->rootfs.path && setenv("LXC_ROOTFS_PATH", conf->rootfs.path, 1)) {
3561 SYSERROR("failed to set environment variable for rootfs mount");
3562 }
3563
3564 if (run_lxc_hooks(c->name, "clone", conf, hookargs)) {
3565 ERROR("Error executing clone hook for %s", c->name);
3566 storage_put(bdev);
3567 return -1;
3568 }
3569 }
3570
3571 if (!(flags & LXC_CLONE_KEEPNAME)) {
3572 ret = snprintf(path, MAXPATHLEN, "%s/etc/hostname", bdev->dest);
3573 storage_put(bdev);
3574
3575 if (ret < 0 || ret >= MAXPATHLEN)
3576 return -1;
3577 if (!file_exists(path))
3578 return 0;
3579 if (!(fout = fopen(path, "w"))) {
3580 SYSERROR("unable to open %s: ignoring", path);
3581 return 0;
3582 }
3583 if (fprintf(fout, "%s", c->name) < 0) {
3584 fclose(fout);
3585 return -1;
3586 }
3587 if (fclose(fout) < 0)
3588 return -1;
3589 } else {
3590 storage_put(bdev);
3591 }
3592
3593 return 0;
3594 }
3595
3596 static int clone_update_rootfs_wrapper(void *data)
3597 {
3598 struct clone_update_data *arg = (struct clone_update_data *) data;
3599 return clone_update_rootfs(arg);
3600 }
3601
3602 /*
3603 * We want to support:
3604 sudo lxc-clone -o o1 -n n1 -s -L|-fssize fssize -v|--vgname vgname \
3605 -p|--lvprefix lvprefix -t|--fstype fstype -B backingstore
3606
3607 -s [ implies overlay]
3608 -s -B overlay
3609
3610 only rootfs gets converted (copied/snapshotted) on clone.
3611 */
3612
3613 static int create_file_dirname(char *path, struct lxc_conf *conf)
3614 {
3615 char *p = strrchr(path, '/');
3616 int ret = -1;
3617
3618 if (!p)
3619 return -1;
3620 *p = '\0';
3621 ret = do_create_container_dir(path, conf);
3622 *p = '/';
3623 return ret;
3624 }
3625
3626 static struct lxc_container *do_lxcapi_clone(struct lxc_container *c, const char *newname,
3627 const char *lxcpath, int flags,
3628 const char *bdevtype, const char *bdevdata, uint64_t newsize,
3629 char **hookargs)
3630 {
3631 char newpath[MAXPATHLEN];
3632 int fd, ret;
3633 struct clone_update_data data;
3634 size_t saved_unexp_len;
3635 pid_t pid;
3636 int storage_copied = 0;
3637 char *origroot = NULL, *saved_unexp_conf = NULL;
3638 struct lxc_container *c2 = NULL;
3639
3640 if (!c || !do_lxcapi_is_defined(c))
3641 return NULL;
3642
3643 if (container_mem_lock(c))
3644 return NULL;
3645
3646 if (!is_stopped(c)) {
3647 ERROR("error: Original container (%s) is running", c->name);
3648 goto out;
3649 }
3650
3651 /* Make sure the container doesn't yet exist. */
3652 if (!newname)
3653 newname = c->name;
3654 if (!lxcpath)
3655 lxcpath = do_lxcapi_get_config_path(c);
3656 ret = snprintf(newpath, MAXPATHLEN, "%s/%s/config", lxcpath, newname);
3657 if (ret < 0 || ret >= MAXPATHLEN) {
3658 SYSERROR("clone: failed making config pathname");
3659 goto out;
3660 }
3661
3662 if (file_exists(newpath)) {
3663 ERROR("error: clone: %s exists", newpath);
3664 goto out;
3665 }
3666
3667 ret = create_file_dirname(newpath, c->lxc_conf);
3668 if (ret < 0 && errno != EEXIST) {
3669 ERROR("Error creating container dir for %s", newpath);
3670 goto out;
3671 }
3672
3673 /* Copy the configuration. Tweak it as needed. */
3674 if (c->lxc_conf->rootfs.path) {
3675 origroot = c->lxc_conf->rootfs.path;
3676 c->lxc_conf->rootfs.path = NULL;
3677 }
3678
3679 fd = open(newpath, O_WRONLY | O_CREAT | O_CLOEXEC,
3680 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
3681 if (fd < 0) {
3682 SYSERROR("Failed to open \"%s\"", newpath);
3683 goto out;
3684 }
3685
3686 saved_unexp_conf = c->lxc_conf->unexpanded_config;
3687 saved_unexp_len = c->lxc_conf->unexpanded_len;
3688 c->lxc_conf->unexpanded_config = strdup(saved_unexp_conf);
3689 if (!c->lxc_conf->unexpanded_config) {
3690 close(fd);
3691 goto out;
3692 }
3693
3694 clear_unexp_config_line(c->lxc_conf, "lxc.rootfs.path", false);
3695 write_config(fd, c->lxc_conf);
3696 close(fd);
3697 c->lxc_conf->rootfs.path = origroot;
3698 free(c->lxc_conf->unexpanded_config);
3699 c->lxc_conf->unexpanded_config = saved_unexp_conf;
3700 saved_unexp_conf = NULL;
3701 c->lxc_conf->unexpanded_len = saved_unexp_len;
3702
3703 ret = snprintf(newpath, MAXPATHLEN, "%s/%s/rootfs", lxcpath, newname);
3704 if (ret < 0 || ret >= MAXPATHLEN) {
3705 SYSERROR("clone: failed making rootfs pathname");
3706 goto out;
3707 }
3708
3709 ret = mkdir(newpath, 0755);
3710 if (ret < 0) {
3711 /* For an overlay container the rootfs is considered immutable
3712 * and will not have been removed when restoring from a
3713 * snapshot.
3714 */
3715 if (errno != ENOENT &&
3716 !(flags & LXC_STORAGE_INTERNAL_OVERLAY_RESTORE)) {
3717 SYSERROR("Failed to create directory \"%s\"", newpath);
3718 goto out;
3719 }
3720 }
3721
3722 if (am_guest_unpriv()) {
3723 if (chown_mapped_root(newpath, c->lxc_conf) < 0) {
3724 ERROR("Error chowning %s to container root", newpath);
3725 goto out;
3726 }
3727 }
3728
3729 c2 = lxc_container_new(newname, lxcpath);
3730 if (!c2) {
3731 ERROR("clone: failed to create new container (%s %s)", newname,
3732 lxcpath);
3733 goto out;
3734 }
3735
3736 /* copy/snapshot rootfs's */
3737 ret = copy_storage(c, c2, bdevtype, flags, bdevdata, newsize);
3738 if (ret < 0)
3739 goto out;
3740
3741
3742 /* update utsname */
3743 if (!(flags & LXC_CLONE_KEEPNAME)) {
3744 clear_unexp_config_line(c2->lxc_conf, "lxc.utsname", false);
3745 clear_unexp_config_line(c2->lxc_conf, "lxc.uts.name", false);
3746
3747 if (!do_set_config_item_locked(c2, "lxc.uts.name", newname)) {
3748 ERROR("Error setting new hostname");
3749 goto out;
3750 }
3751 }
3752
3753 /* copy hooks */
3754 ret = copyhooks(c, c2);
3755 if (ret < 0) {
3756 ERROR("error copying hooks");
3757 goto out;
3758 }
3759
3760 if (copy_fstab(c, c2) < 0) {
3761 ERROR("error copying fstab");
3762 goto out;
3763 }
3764
3765 /* update macaddrs */
3766 if (!(flags & LXC_CLONE_KEEPMACADDR)) {
3767 if (!network_new_hwaddrs(c2->lxc_conf)) {
3768 ERROR("Error updating mac addresses");
3769 goto out;
3770 }
3771 }
3772
3773 /* Update absolute paths for overlay mount directories. */
3774 if (ovl_update_abs_paths(c2->lxc_conf, c->config_path, c->name, lxcpath, newname) < 0)
3775 goto out;
3776
3777 /* We've now successfully created c2's storage, so clear it out if we
3778 * fail after this.
3779 */
3780 storage_copied = 1;
3781
3782 if (!c2->save_config(c2, NULL))
3783 goto out;
3784
3785 if ((pid = fork()) < 0) {
3786 SYSERROR("fork");
3787 goto out;
3788 }
3789 if (pid > 0) {
3790 ret = wait_for_pid(pid);
3791 if (ret)
3792 goto out;
3793 container_mem_unlock(c);
3794 return c2;
3795 }
3796 data.c0 = c;
3797 data.c1 = c2;
3798 data.flags = flags;
3799 data.hookargs = hookargs;
3800 if (am_guest_unpriv())
3801 ret = userns_exec_full(c->lxc_conf, clone_update_rootfs_wrapper,
3802 &data, "clone_update_rootfs_wrapper");
3803 else
3804 ret = clone_update_rootfs(&data);
3805 if (ret < 0)
3806 _exit(EXIT_FAILURE);
3807
3808 container_mem_unlock(c);
3809 _exit(EXIT_SUCCESS);
3810
3811 out:
3812 container_mem_unlock(c);
3813 if (c2) {
3814 if (!storage_copied)
3815 c2->lxc_conf->rootfs.path = NULL;
3816 c2->destroy(c2);
3817 lxc_container_put(c2);
3818 }
3819
3820 return NULL;
3821 }
3822
3823 static struct lxc_container *lxcapi_clone(struct lxc_container *c, const char *newname,
3824 const char *lxcpath, int flags,
3825 const char *bdevtype, const char *bdevdata, uint64_t newsize,
3826 char **hookargs)
3827 {
3828 struct lxc_container * ret;
3829 current_config = c ? c->lxc_conf : NULL;
3830 ret = do_lxcapi_clone(c, newname, lxcpath, flags, bdevtype, bdevdata, newsize, hookargs);
3831 current_config = NULL;
3832 return ret;
3833 }
3834
3835 static bool do_lxcapi_rename(struct lxc_container *c, const char *newname)
3836 {
3837 struct lxc_storage *bdev;
3838 struct lxc_container *newc;
3839
3840 if (!c || !c->name || !c->config_path || !c->lxc_conf)
3841 return false;
3842
3843 if (has_fs_snapshots(c) || has_snapshots(c)) {
3844 ERROR("Renaming a container with snapshots is not supported");
3845 return false;
3846 }
3847 bdev = storage_init(c->lxc_conf);
3848 if (!bdev) {
3849 ERROR("Failed to find original backing store type");
3850 return false;
3851 }
3852
3853 newc = lxcapi_clone(c, newname, c->config_path, LXC_CLONE_KEEPMACADDR, NULL, bdev->type, 0, NULL);
3854 storage_put(bdev);
3855 if (!newc) {
3856 lxc_container_put(newc);
3857 return false;
3858 }
3859
3860 if (newc && lxcapi_is_defined(newc))
3861 lxc_container_put(newc);
3862
3863 if (!container_destroy(c, NULL)) {
3864 ERROR("Could not destroy existing container %s", c->name);
3865 return false;
3866 }
3867 return true;
3868 }
3869
3870 WRAP_API_1(bool, lxcapi_rename, const char *)
3871
3872 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)
3873 {
3874 int ret;
3875
3876 if (!c)
3877 return -1;
3878
3879 current_config = c->lxc_conf;
3880
3881 ret = lxc_attach(c->name, c->config_path, exec_function, exec_payload, options, attached_process);
3882 current_config = NULL;
3883 return ret;
3884 }
3885
3886 static int do_lxcapi_attach_run_wait(struct lxc_container *c, lxc_attach_options_t *options, const char *program, const char * const argv[])
3887 {
3888 lxc_attach_command_t command;
3889 pid_t pid;
3890 int r;
3891
3892 if (!c)
3893 return -1;
3894
3895 command.program = (char*)program;
3896 command.argv = (char**)argv;
3897 r = lxc_attach(c->name, c->config_path, lxc_attach_run_command, &command, options, &pid);
3898 if (r < 0) {
3899 ERROR("ups");
3900 return r;
3901 }
3902 return lxc_wait_for_pid_status(pid);
3903 }
3904
3905 static int lxcapi_attach_run_wait(struct lxc_container *c, lxc_attach_options_t *options, const char *program, const char * const argv[])
3906 {
3907 int ret;
3908 current_config = c ? c->lxc_conf : NULL;
3909 ret = do_lxcapi_attach_run_wait(c, options, program, argv);
3910 current_config = NULL;
3911 return ret;
3912 }
3913
3914 static int get_next_index(const char *lxcpath, char *cname)
3915 {
3916 char *fname;
3917 struct stat sb;
3918 int i = 0, ret;
3919
3920 fname = alloca(strlen(lxcpath) + 20);
3921 while (1) {
3922 sprintf(fname, "%s/snap%d", lxcpath, i);
3923 ret = stat(fname, &sb);
3924 if (ret != 0)
3925 return i;
3926 i++;
3927 }
3928 }
3929
3930 static bool get_snappath_dir(struct lxc_container *c, char *snappath)
3931 {
3932 int ret;
3933 /*
3934 * If the old style snapshot path exists, use it
3935 * /var/lib/lxc -> /var/lib/lxcsnaps
3936 */
3937 ret = snprintf(snappath, MAXPATHLEN, "%ssnaps", c->config_path);
3938 if (ret < 0 || ret >= MAXPATHLEN)
3939 return false;
3940 if (dir_exists(snappath)) {
3941 ret = snprintf(snappath, MAXPATHLEN, "%ssnaps/%s", c->config_path, c->name);
3942 if (ret < 0 || ret >= MAXPATHLEN)
3943 return false;
3944 return true;
3945 }
3946
3947 /*
3948 * Use the new style path
3949 * /var/lib/lxc -> /var/lib/lxc + c->name + /snaps + \0
3950 */
3951 ret = snprintf(snappath, MAXPATHLEN, "%s/%s/snaps", c->config_path, c->name);
3952 if (ret < 0 || ret >= MAXPATHLEN)
3953 return false;
3954 return true;
3955 }
3956
3957 static int do_lxcapi_snapshot(struct lxc_container *c, const char *commentfile)
3958 {
3959 int i, flags, ret;
3960 struct lxc_container *c2;
3961 char snappath[MAXPATHLEN], newname[20];
3962
3963 if (!c || !lxcapi_is_defined(c))
3964 return -1;
3965
3966 if (!storage_can_backup(c->lxc_conf)) {
3967 ERROR("%s's backing store cannot be backed up.", c->name);
3968 ERROR("Your container must use another backing store type.");
3969 return -1;
3970 }
3971
3972 if (!get_snappath_dir(c, snappath))
3973 return -1;
3974
3975 i = get_next_index(snappath, c->name);
3976
3977 if (mkdir_p(snappath, 0755) < 0) {
3978 ERROR("Failed to create snapshot directory %s", snappath);
3979 return -1;
3980 }
3981
3982 ret = snprintf(newname, 20, "snap%d", i);
3983 if (ret < 0 || ret >= 20)
3984 return -1;
3985
3986 /*
3987 * We pass LXC_CLONE_SNAPSHOT to make sure that a rdepends file entry is
3988 * created in the original container
3989 */
3990 flags = LXC_CLONE_SNAPSHOT | LXC_CLONE_KEEPMACADDR | LXC_CLONE_KEEPNAME |
3991 LXC_CLONE_KEEPBDEVTYPE | LXC_CLONE_MAYBE_SNAPSHOT;
3992 if (storage_is_dir(c->lxc_conf)) {
3993 ERROR("Snapshot of directory-backed container requested.");
3994 ERROR("Making a copy-clone. If you do want snapshots, then");
3995 ERROR("please create overlay clone first, snapshot that");
3996 ERROR("and keep the original container pristine.");
3997 flags &= ~LXC_CLONE_SNAPSHOT | LXC_CLONE_MAYBE_SNAPSHOT;
3998 }
3999 c2 = do_lxcapi_clone(c, newname, snappath, flags, NULL, NULL, 0, NULL);
4000 if (!c2) {
4001 ERROR("clone of %s:%s failed", c->config_path, c->name);
4002 return -1;
4003 }
4004
4005 lxc_container_put(c2);
4006
4007 /* Now write down the creation time. */
4008 time_t timer;
4009 char buffer[25];
4010 struct tm* tm_info;
4011 FILE *f;
4012
4013 time(&timer);
4014 tm_info = localtime(&timer);
4015
4016 strftime(buffer, 25, "%Y:%m:%d %H:%M:%S", tm_info);
4017
4018 char *dfnam = alloca(strlen(snappath) + strlen(newname) + 5);
4019 sprintf(dfnam, "%s/%s/ts", snappath, newname);
4020 f = fopen(dfnam, "w");
4021 if (!f) {
4022 ERROR("Failed to open %s", dfnam);
4023 return -1;
4024 }
4025 if (fprintf(f, "%s", buffer) < 0) {
4026 SYSERROR("Writing timestamp");
4027 fclose(f);
4028 return -1;
4029 }
4030 ret = fclose(f);
4031 if (ret != 0) {
4032 SYSERROR("Writing timestamp");
4033 return -1;
4034 }
4035
4036 if (commentfile) {
4037 /* $p / $name / comment \0 */
4038 int len = strlen(snappath) + strlen(newname) + 10;
4039 char *path = alloca(len);
4040 sprintf(path, "%s/%s/comment", snappath, newname);
4041 return copy_file(commentfile, path) < 0 ? -1 : i;
4042 }
4043
4044 return i;
4045 }
4046
4047 WRAP_API_1(int, lxcapi_snapshot, const char *)
4048
4049 static void lxcsnap_free(struct lxc_snapshot *s)
4050 {
4051 free(s->name);
4052 free(s->comment_pathname);
4053 free(s->timestamp);
4054 free(s->lxcpath);
4055 }
4056
4057 static char *get_snapcomment_path(char* snappath, char *name)
4058 {
4059 /* $snappath/$name/comment */
4060 int ret, len = strlen(snappath) + strlen(name) + 10;
4061 char *s = malloc(len);
4062
4063 if (s) {
4064 ret = snprintf(s, len, "%s/%s/comment", snappath, name);
4065 if (ret < 0 || ret >= len) {
4066 free(s);
4067 s = NULL;
4068 }
4069 }
4070 return s;
4071 }
4072
4073 static char *get_timestamp(char* snappath, char *name)
4074 {
4075 char path[MAXPATHLEN], *s = NULL;
4076 int ret, len;
4077 FILE *fin;
4078
4079 ret = snprintf(path, MAXPATHLEN, "%s/%s/ts", snappath, name);
4080 if (ret < 0 || ret >= MAXPATHLEN)
4081 return NULL;
4082 fin = fopen(path, "r");
4083 if (!fin)
4084 return NULL;
4085 (void) fseek(fin, 0, SEEK_END);
4086 len = ftell(fin);
4087 (void) fseek(fin, 0, SEEK_SET);
4088 if (len > 0) {
4089 s = malloc(len+1);
4090 if (s) {
4091 s[len] = '\0';
4092 if (fread(s, 1, len, fin) != len) {
4093 SYSERROR("reading timestamp");
4094 free(s);
4095 s = NULL;
4096 }
4097 }
4098 }
4099 fclose(fin);
4100 return s;
4101 }
4102
4103 static int do_lxcapi_snapshot_list(struct lxc_container *c, struct lxc_snapshot **ret_snaps)
4104 {
4105 char snappath[MAXPATHLEN], path2[MAXPATHLEN];
4106 int count = 0, ret;
4107 struct dirent *direntp;
4108 struct lxc_snapshot *snaps =NULL, *nsnaps;
4109 DIR *dir;
4110
4111 if (!c || !lxcapi_is_defined(c))
4112 return -1;
4113
4114 if (!get_snappath_dir(c, snappath)) {
4115 ERROR("path name too long");
4116 return -1;
4117 }
4118 dir = opendir(snappath);
4119 if (!dir) {
4120 INFO("failed to open %s - assuming no snapshots", snappath);
4121 return 0;
4122 }
4123
4124 while ((direntp = readdir(dir))) {
4125 if (!direntp)
4126 break;
4127
4128 if (!strcmp(direntp->d_name, "."))
4129 continue;
4130
4131 if (!strcmp(direntp->d_name, ".."))
4132 continue;
4133
4134 ret = snprintf(path2, MAXPATHLEN, "%s/%s/config", snappath, direntp->d_name);
4135 if (ret < 0 || ret >= MAXPATHLEN) {
4136 ERROR("pathname too long");
4137 goto out_free;
4138 }
4139 if (!file_exists(path2))
4140 continue;
4141 nsnaps = realloc(snaps, (count + 1)*sizeof(*snaps));
4142 if (!nsnaps) {
4143 SYSERROR("Out of memory");
4144 goto out_free;
4145 }
4146 snaps = nsnaps;
4147 snaps[count].free = lxcsnap_free;
4148 snaps[count].name = strdup(direntp->d_name);
4149 if (!snaps[count].name)
4150 goto out_free;
4151 snaps[count].lxcpath = strdup(snappath);
4152 if (!snaps[count].lxcpath) {
4153 free(snaps[count].name);
4154 goto out_free;
4155 }
4156 snaps[count].comment_pathname = get_snapcomment_path(snappath, direntp->d_name);
4157 snaps[count].timestamp = get_timestamp(snappath, direntp->d_name);
4158 count++;
4159 }
4160
4161 if (closedir(dir))
4162 WARN("failed to close directory");
4163
4164 *ret_snaps = snaps;
4165 return count;
4166
4167 out_free:
4168 if (snaps) {
4169 int i;
4170 for (i=0; i<count; i++)
4171 lxcsnap_free(&snaps[i]);
4172 free(snaps);
4173 }
4174 if (closedir(dir))
4175 WARN("failed to close directory");
4176 return -1;
4177 }
4178
4179 WRAP_API_1(int, lxcapi_snapshot_list, struct lxc_snapshot **)
4180
4181 static bool do_lxcapi_snapshot_restore(struct lxc_container *c, const char *snapname, const char *newname)
4182 {
4183 char clonelxcpath[MAXPATHLEN];
4184 int flags = 0;
4185 struct lxc_container *snap, *rest;
4186 struct lxc_storage *bdev;
4187 bool b = false;
4188
4189 if (!c || !c->name || !c->config_path)
4190 return false;
4191
4192 if (has_fs_snapshots(c)) {
4193 ERROR("container rootfs has dependent snapshots");
4194 return false;
4195 }
4196
4197 bdev = storage_init(c->lxc_conf);
4198 if (!bdev) {
4199 ERROR("Failed to find original backing store type");
4200 return false;
4201 }
4202
4203 /* For an overlay container the rootfs is considered immutable
4204 * and cannot be removed when restoring from a snapshot. We pass this
4205 * internal flag along to communicate this to various parts of the
4206 * codebase.
4207 */
4208 if (!strcmp(bdev->type, "overlay") || !strcmp(bdev->type, "overlayfs"))
4209 bdev->flags |= LXC_STORAGE_INTERNAL_OVERLAY_RESTORE;
4210
4211 if (!newname)
4212 newname = c->name;
4213
4214 if (!get_snappath_dir(c, clonelxcpath)) {
4215 storage_put(bdev);
4216 return false;
4217 }
4218 /* how should we lock this? */
4219
4220 snap = lxc_container_new(snapname, clonelxcpath);
4221 if (!snap || !lxcapi_is_defined(snap)) {
4222 ERROR("Could not open snapshot %s", snapname);
4223 if (snap)
4224 lxc_container_put(snap);
4225 storage_put(bdev);
4226 return false;
4227 }
4228
4229 if (!strcmp(c->name, newname)) {
4230 if (!container_destroy(c, bdev)) {
4231 ERROR("Could not destroy existing container %s", newname);
4232 lxc_container_put(snap);
4233 storage_put(bdev);
4234 return false;
4235 }
4236 }
4237
4238 if (strcmp(bdev->type, "dir") != 0 && strcmp(bdev->type, "loop") != 0)
4239 flags = LXC_CLONE_SNAPSHOT | LXC_CLONE_MAYBE_SNAPSHOT;
4240
4241 if (!strcmp(bdev->type, "overlay") || !strcmp(bdev->type, "overlayfs"))
4242 flags |= LXC_STORAGE_INTERNAL_OVERLAY_RESTORE;
4243 rest = lxcapi_clone(snap, newname, c->config_path, flags, bdev->type,
4244 NULL, 0, NULL);
4245 storage_put(bdev);
4246 if (rest && lxcapi_is_defined(rest))
4247 b = true;
4248 if (rest)
4249 lxc_container_put(rest);
4250
4251 lxc_container_put(snap);
4252 return b;
4253 }
4254
4255 WRAP_API_2(bool, lxcapi_snapshot_restore, const char *, const char *)
4256
4257 static bool do_snapshot_destroy(const char *snapname, const char *clonelxcpath)
4258 {
4259 struct lxc_container *snap = NULL;
4260 bool bret = false;
4261
4262 snap = lxc_container_new(snapname, clonelxcpath);
4263 if (!snap) {
4264 ERROR("Could not find snapshot %s", snapname);
4265 goto err;
4266 }
4267
4268 if (!do_lxcapi_destroy(snap)) {
4269 ERROR("Could not destroy snapshot %s", snapname);
4270 goto err;
4271 }
4272 bret = true;
4273
4274 err:
4275 if (snap)
4276 lxc_container_put(snap);
4277 return bret;
4278 }
4279
4280 static bool remove_all_snapshots(const char *path)
4281 {
4282 DIR *dir;
4283 struct dirent *direntp;
4284 bool bret = true;
4285
4286 dir = opendir(path);
4287 if (!dir) {
4288 SYSERROR("opendir on snapshot path %s", path);
4289 return false;
4290 }
4291 while ((direntp = readdir(dir))) {
4292 if (!strcmp(direntp->d_name, "."))
4293 continue;
4294 if (!strcmp(direntp->d_name, ".."))
4295 continue;
4296 if (!do_snapshot_destroy(direntp->d_name, path)) {
4297 bret = false;
4298 continue;
4299 }
4300 }
4301
4302 closedir(dir);
4303
4304 if (rmdir(path))
4305 SYSERROR("Error removing directory %s", path);
4306
4307 return bret;
4308 }
4309
4310 static bool do_lxcapi_snapshot_destroy(struct lxc_container *c, const char *snapname)
4311 {
4312 char clonelxcpath[MAXPATHLEN];
4313
4314 if (!c || !c->name || !c->config_path || !snapname)
4315 return false;
4316
4317 if (!get_snappath_dir(c, clonelxcpath))
4318 return false;
4319
4320 return do_snapshot_destroy(snapname, clonelxcpath);
4321 }
4322
4323 WRAP_API_1(bool, lxcapi_snapshot_destroy, const char *)
4324
4325 static bool do_lxcapi_snapshot_destroy_all(struct lxc_container *c)
4326 {
4327 char clonelxcpath[MAXPATHLEN];
4328
4329 if (!c || !c->name || !c->config_path)
4330 return false;
4331
4332 if (!get_snappath_dir(c, clonelxcpath))
4333 return false;
4334
4335 return remove_all_snapshots(clonelxcpath);
4336 }
4337
4338 WRAP_API(bool, lxcapi_snapshot_destroy_all)
4339
4340 static bool do_lxcapi_may_control(struct lxc_container *c)
4341 {
4342 return lxc_try_cmd(c->name, c->config_path) == 0;
4343 }
4344
4345 WRAP_API(bool, lxcapi_may_control)
4346
4347 static bool do_add_remove_node(pid_t init_pid, const char *path, bool add,
4348 struct stat *st)
4349 {
4350 int ret;
4351 char *tmp;
4352 pid_t pid;
4353 char chrootpath[MAXPATHLEN];
4354 char *directory_path = NULL;
4355
4356 pid = fork();
4357 if (pid < 0) {
4358 SYSERROR("Failed to fork()");
4359 return false;
4360 }
4361
4362 if (pid) {
4363 ret = wait_for_pid(pid);
4364 if (ret != 0) {
4365 ERROR("Failed to create device node");
4366 return false;
4367 }
4368
4369 return true;
4370 }
4371
4372 /* prepare the path */
4373 ret = snprintf(chrootpath, MAXPATHLEN, "/proc/%d/root", init_pid);
4374 if (ret < 0 || ret >= MAXPATHLEN)
4375 return false;
4376
4377 ret = chroot(chrootpath);
4378 if (ret < 0)
4379 _exit(EXIT_FAILURE);
4380
4381 ret = chdir("/");
4382 if (ret < 0)
4383 _exit(EXIT_FAILURE);
4384
4385 /* remove path if it exists */
4386 ret = faccessat(AT_FDCWD, path, F_OK, AT_SYMLINK_NOFOLLOW);
4387 if(ret == 0) {
4388 ret = unlink(path);
4389 if (ret < 0) {
4390 ERROR("%s - Failed to remove \"%s\"", strerror(errno), path);
4391 _exit(EXIT_FAILURE);
4392 }
4393 }
4394
4395 if (!add)
4396 _exit(EXIT_SUCCESS);
4397
4398 /* create any missing directories */
4399 tmp = strdup(path);
4400 if (!tmp)
4401 _exit(EXIT_FAILURE);
4402
4403 directory_path = dirname(tmp);
4404 ret = mkdir_p(directory_path, 0755);
4405 if (ret < 0 && errno != EEXIST) {
4406 ERROR("%s - Failed to create path \"%s\"", strerror(errno), directory_path);
4407 free(tmp);
4408 _exit(EXIT_FAILURE);
4409 }
4410
4411 /* create the device node */
4412 ret = mknod(path, st->st_mode, st->st_rdev);
4413 free(tmp);
4414 if (ret < 0) {
4415 ERROR("%s - Failed to create device node at \"%s\"", strerror(errno), path);
4416 _exit(EXIT_FAILURE);
4417 }
4418
4419 _exit(EXIT_SUCCESS);
4420 }
4421
4422 static bool add_remove_device_node(struct lxc_container *c, const char *src_path, const char *dest_path, bool add)
4423 {
4424 int ret;
4425 struct stat st;
4426 char value[LXC_MAX_BUFFER];
4427 const char *p;
4428
4429 /* make sure container is running */
4430 if (!do_lxcapi_is_running(c)) {
4431 ERROR("container is not running");
4432 return false;
4433 }
4434
4435 /* use src_path if dest_path is NULL otherwise use dest_path */
4436 p = dest_path ? dest_path : src_path;
4437
4438 /* make sure we can access p */
4439 if(access(p, F_OK) < 0 || stat(p, &st) < 0)
4440 return false;
4441
4442 /* continue if path is character device or block device */
4443 if (S_ISCHR(st.st_mode))
4444 ret = snprintf(value, LXC_MAX_BUFFER, "c %d:%d rwm", major(st.st_rdev), minor(st.st_rdev));
4445 else if (S_ISBLK(st.st_mode))
4446 ret = snprintf(value, LXC_MAX_BUFFER, "b %d:%d rwm", major(st.st_rdev), minor(st.st_rdev));
4447 else
4448 return false;
4449
4450 /* check snprintf return code */
4451 if (ret < 0 || ret >= LXC_MAX_BUFFER)
4452 return false;
4453
4454 if (!do_add_remove_node(do_lxcapi_init_pid(c), p, add, &st))
4455 return false;
4456
4457 /* add or remove device to/from cgroup access list */
4458 if (add) {
4459 if (!do_lxcapi_set_cgroup_item(c, "devices.allow", value)) {
4460 ERROR("set_cgroup_item failed while adding the device node");
4461 return false;
4462 }
4463 } else {
4464 if (!do_lxcapi_set_cgroup_item(c, "devices.deny", value)) {
4465 ERROR("set_cgroup_item failed while removing the device node");
4466 return false;
4467 }
4468 }
4469
4470 return true;
4471 }
4472
4473 static bool do_lxcapi_add_device_node(struct lxc_container *c, const char *src_path, const char *dest_path)
4474 {
4475 // cannot mknod if we're not privileged wrt init_user_ns
4476 if (am_host_unpriv()) {
4477 ERROR(LXC_UNPRIV_EOPNOTSUPP, __FUNCTION__);
4478 return false;
4479 }
4480 return add_remove_device_node(c, src_path, dest_path, true);
4481 }
4482
4483 WRAP_API_2(bool, lxcapi_add_device_node, const char *, const char *)
4484
4485 static bool do_lxcapi_remove_device_node(struct lxc_container *c, const char *src_path, const char *dest_path)
4486 {
4487 if (am_guest_unpriv()) {
4488 ERROR(LXC_UNPRIV_EOPNOTSUPP, __FUNCTION__);
4489 return false;
4490 }
4491 return add_remove_device_node(c, src_path, dest_path, false);
4492 }
4493
4494 WRAP_API_2(bool, lxcapi_remove_device_node, const char *, const char *)
4495
4496 static bool do_lxcapi_attach_interface(struct lxc_container *c,
4497 const char *ifname,
4498 const char *dst_ifname)
4499 {
4500 pid_t init_pid;
4501 int ret = 0;
4502
4503 if (am_guest_unpriv()) {
4504 ERROR(LXC_UNPRIV_EOPNOTSUPP, __FUNCTION__);
4505 return false;
4506 }
4507
4508 if (!ifname) {
4509 ERROR("No source interface name given");
4510 return false;
4511 }
4512
4513 ret = lxc_netdev_isup(ifname);
4514 if (ret > 0) {
4515 /* netdev of ifname is up. */
4516 ret = lxc_netdev_down(ifname);
4517 if (ret)
4518 goto err;
4519 }
4520
4521 init_pid = do_lxcapi_init_pid(c);
4522 ret = lxc_netdev_move_by_name(ifname, init_pid, dst_ifname);
4523 if (ret)
4524 goto err;
4525
4526 INFO("Moved network device \"%s\" to network namespace of %d", ifname, init_pid);
4527 return true;
4528
4529 err:
4530 return false;
4531 }
4532
4533 WRAP_API_2(bool, lxcapi_attach_interface, const char *, const char *)
4534
4535 static bool do_lxcapi_detach_interface(struct lxc_container *c,
4536 const char *ifname,
4537 const char *dst_ifname)
4538 {
4539 int ret;
4540 pid_t pid, pid_outside;
4541
4542 /*
4543 * TODO - if this is a physical device, then we need am_host_unpriv.
4544 * But for other types guest privilege suffices.
4545 */
4546 if (am_guest_unpriv()) {
4547 ERROR(LXC_UNPRIV_EOPNOTSUPP, __FUNCTION__);
4548 return false;
4549 }
4550
4551 if (!ifname) {
4552 ERROR("No source interface name given");
4553 return false;
4554 }
4555
4556 pid_outside = lxc_raw_getpid();
4557 pid = fork();
4558 if (pid < 0) {
4559 ERROR("Failed to fork");
4560 return false;
4561 }
4562
4563 if (pid == 0) { /* child */
4564 pid_t init_pid;
4565
4566 init_pid = do_lxcapi_init_pid(c);
4567 if (!switch_to_ns(init_pid, "net")) {
4568 ERROR("Failed to enter network namespace");
4569 _exit(EXIT_FAILURE);
4570 }
4571
4572 ret = lxc_netdev_isup(ifname);
4573 if (ret < 0) {
4574 ERROR("Failed to determine whether network device \"%s\" is up", ifname);
4575 _exit(EXIT_FAILURE);
4576 }
4577
4578 /* netdev of ifname is up. */
4579 if (ret) {
4580 ret = lxc_netdev_down(ifname);
4581 if (ret) {
4582 ERROR("Failed to set network device \"%s\" down", ifname);
4583 _exit(EXIT_FAILURE);
4584 }
4585 }
4586
4587 ret = lxc_netdev_move_by_name(ifname, pid_outside, dst_ifname);
4588 /* -EINVAL means there is no netdev named as ifname. */
4589 if (ret < 0) {
4590 if (ret == -EINVAL)
4591 ERROR("Network device \"%s\" not found", ifname);
4592 else
4593 ERROR("Failed to remove network device \"%s\"", ifname);
4594 _exit(EXIT_FAILURE);
4595 }
4596
4597 _exit(EXIT_SUCCESS);
4598 }
4599
4600 ret = wait_for_pid(pid);
4601 if (ret != 0)
4602 return false;
4603
4604 INFO("Moved network device \"%s\" to network namespace of %d", ifname, pid_outside);
4605 return true;
4606 }
4607
4608 WRAP_API_2(bool, lxcapi_detach_interface, const char *, const char *)
4609
4610 static int do_lxcapi_migrate(struct lxc_container *c, unsigned int cmd,
4611 struct migrate_opts *opts, unsigned int size)
4612 {
4613 int ret = -1;
4614 struct migrate_opts *valid_opts = opts;
4615 uint64_t features_to_check = 0;
4616
4617 /* If the caller has a bigger (newer) struct migrate_opts, let's make
4618 * sure that the stuff on the end is zero, i.e. that they didn't ask us
4619 * to do anything special.
4620 */
4621 if (size > sizeof(*opts)) {
4622 unsigned char *addr;
4623 unsigned char *end;
4624
4625 addr = (void *)opts + sizeof(*opts);
4626 end = (void *)opts + size;
4627 for (; addr < end; addr++) {
4628 if (*addr) {
4629 return -E2BIG;
4630 }
4631 }
4632 }
4633
4634 /* If the caller has a smaller struct, let's zero out the end for them
4635 * so we don't accidentally use bits of it that they didn't know about
4636 * to initialize.
4637 */
4638 if (size < sizeof(*opts)) {
4639 valid_opts = malloc(sizeof(*opts));
4640 if (!valid_opts)
4641 return -ENOMEM;
4642
4643 memset(valid_opts, 0, sizeof(*opts));
4644 memcpy(valid_opts, opts, size);
4645 }
4646
4647 switch (cmd) {
4648 case MIGRATE_PRE_DUMP:
4649 if (!do_lxcapi_is_running(c)) {
4650 ERROR("container is not running");
4651 goto on_error;
4652 }
4653 ret = !__criu_pre_dump(c, valid_opts);
4654 break;
4655 case MIGRATE_DUMP:
4656 if (!do_lxcapi_is_running(c)) {
4657 ERROR("container is not running");
4658 goto on_error;
4659 }
4660 ret = !__criu_dump(c, valid_opts);
4661 break;
4662 case MIGRATE_RESTORE:
4663 if (do_lxcapi_is_running(c)) {
4664 ERROR("container is already running");
4665 goto on_error;
4666 }
4667 ret = !__criu_restore(c, valid_opts);
4668 break;
4669 case MIGRATE_FEATURE_CHECK:
4670 features_to_check = valid_opts->features_to_check;
4671 ret = !__criu_check_feature(&features_to_check);
4672 if (ret) {
4673 /* Something went wrong. Let's let the caller
4674 * know which feature checks failed. */
4675 valid_opts->features_to_check = features_to_check;
4676 }
4677 break;
4678 default:
4679 ERROR("invalid migrate command %u", cmd);
4680 ret = -EINVAL;
4681 }
4682
4683 on_error:
4684 if (size < sizeof(*opts))
4685 free(valid_opts);
4686
4687 return ret;
4688 }
4689
4690 WRAP_API_3(int, lxcapi_migrate, unsigned int, struct migrate_opts *, unsigned int)
4691
4692 static bool do_lxcapi_checkpoint(struct lxc_container *c, char *directory, bool stop, bool verbose)
4693 {
4694 struct migrate_opts opts;
4695
4696 memset(&opts, 0, sizeof(opts));
4697
4698 opts.directory = directory;
4699 opts.stop = stop;
4700 opts.verbose = verbose;
4701
4702 return !do_lxcapi_migrate(c, MIGRATE_DUMP, &opts, sizeof(opts));
4703 }
4704
4705 WRAP_API_3(bool, lxcapi_checkpoint, char *, bool, bool)
4706
4707 static bool do_lxcapi_restore(struct lxc_container *c, char *directory, bool verbose)
4708 {
4709 struct migrate_opts opts;
4710
4711 memset(&opts, 0, sizeof(opts));
4712
4713 opts.directory = directory;
4714 opts.verbose = verbose;
4715
4716 return !do_lxcapi_migrate(c, MIGRATE_RESTORE, &opts, sizeof(opts));
4717 }
4718
4719 WRAP_API_2(bool, lxcapi_restore, char *, bool)
4720
4721 static int lxcapi_attach_run_waitl(struct lxc_container *c, lxc_attach_options_t *options, const char *program, const char *arg, ...)
4722 {
4723 va_list ap;
4724 const char **argv;
4725 int ret;
4726
4727 if (!c)
4728 return -1;
4729
4730 current_config = c->lxc_conf;
4731
4732 va_start(ap, arg);
4733 argv = lxc_va_arg_list_to_argv_const(ap, 1);
4734 va_end(ap);
4735
4736 if (!argv) {
4737 ERROR("Memory allocation error.");
4738 ret = -1;
4739 goto out;
4740 }
4741 argv[0] = arg;
4742
4743 ret = do_lxcapi_attach_run_wait(c, options, program, (const char * const *)argv);
4744 free((void*)argv);
4745 out:
4746 current_config = NULL;
4747 return ret;
4748 }
4749
4750 struct lxc_container *lxc_container_new(const char *name, const char *configpath)
4751 {
4752 struct lxc_container *c;
4753
4754 if (!name)
4755 return NULL;
4756
4757 c = malloc(sizeof(*c));
4758 if (!c) {
4759 fprintf(stderr, "Failed to allocate memory for %s\n", name);
4760 return NULL;
4761 }
4762 memset(c, 0, sizeof(*c));
4763
4764 if (configpath)
4765 c->config_path = strdup(configpath);
4766 else
4767 c->config_path = strdup(lxc_global_config_value("lxc.lxcpath"));
4768
4769 if (!c->config_path) {
4770 fprintf(stderr, "Failed to allocate memory for %s\n", name);
4771 goto err;
4772 }
4773
4774 remove_trailing_slashes(c->config_path);
4775 c->name = malloc(strlen(name)+1);
4776 if (!c->name) {
4777 fprintf(stderr, "Failed to allocate memory for %s\n", name);
4778 goto err;
4779 }
4780 strcpy(c->name, name);
4781
4782 c->numthreads = 1;
4783 c->slock = lxc_newlock(c->config_path, name);
4784 if (!c->slock) {
4785 fprintf(stderr, "Failed to create lock for %s\n", name);
4786 goto err;
4787 }
4788
4789 c->privlock = lxc_newlock(NULL, NULL);
4790 if (!c->privlock) {
4791 fprintf(stderr, "Failed to create private lock for %s\n", name);
4792 goto err;
4793 }
4794
4795 if (!set_config_filename(c)) {
4796 fprintf(stderr, "Failed to create config file name for %s\n", name);
4797 goto err;
4798 }
4799
4800 if (file_exists(c->configfile) && !lxcapi_load_config(c, NULL)) {
4801 fprintf(stderr, "Failed to load config for %s\n", name);
4802 goto err;
4803 }
4804
4805 if (ongoing_create(c) == 2) {
4806 ERROR("Failed to complete container creation for %s", c->name);
4807 container_destroy(c, NULL);
4808 lxcapi_clear_config(c);
4809 }
4810 c->daemonize = true;
4811 c->pidfile = NULL;
4812
4813 /* Assign the member functions. */
4814 c->is_defined = lxcapi_is_defined;
4815 c->state = lxcapi_state;
4816 c->is_running = lxcapi_is_running;
4817 c->freeze = lxcapi_freeze;
4818 c->unfreeze = lxcapi_unfreeze;
4819 c->console = lxcapi_console;
4820 c->console_getfd = lxcapi_console_getfd;
4821 c->init_pid = lxcapi_init_pid;
4822 c->load_config = lxcapi_load_config;
4823 c->want_daemonize = lxcapi_want_daemonize;
4824 c->want_close_all_fds = lxcapi_want_close_all_fds;
4825 c->start = lxcapi_start;
4826 c->startl = lxcapi_startl;
4827 c->stop = lxcapi_stop;
4828 c->config_file_name = lxcapi_config_file_name;
4829 c->wait = lxcapi_wait;
4830 c->set_config_item = lxcapi_set_config_item;
4831 c->destroy = lxcapi_destroy;
4832 c->destroy_with_snapshots = lxcapi_destroy_with_snapshots;
4833 c->rename = lxcapi_rename;
4834 c->save_config = lxcapi_save_config;
4835 c->get_keys = lxcapi_get_keys;
4836 c->create = lxcapi_create;
4837 c->createl = lxcapi_createl;
4838 c->shutdown = lxcapi_shutdown;
4839 c->reboot = lxcapi_reboot;
4840 c->reboot2 = lxcapi_reboot2;
4841 c->clear_config = lxcapi_clear_config;
4842 c->clear_config_item = lxcapi_clear_config_item;
4843 c->get_config_item = lxcapi_get_config_item;
4844 c->get_running_config_item = lxcapi_get_running_config_item;
4845 c->get_cgroup_item = lxcapi_get_cgroup_item;
4846 c->set_cgroup_item = lxcapi_set_cgroup_item;
4847 c->get_config_path = lxcapi_get_config_path;
4848 c->set_config_path = lxcapi_set_config_path;
4849 c->clone = lxcapi_clone;
4850 c->get_interfaces = lxcapi_get_interfaces;
4851 c->get_ips = lxcapi_get_ips;
4852 c->attach = lxcapi_attach;
4853 c->attach_run_wait = lxcapi_attach_run_wait;
4854 c->attach_run_waitl = lxcapi_attach_run_waitl;
4855 c->snapshot = lxcapi_snapshot;
4856 c->snapshot_list = lxcapi_snapshot_list;
4857 c->snapshot_restore = lxcapi_snapshot_restore;
4858 c->snapshot_destroy = lxcapi_snapshot_destroy;
4859 c->snapshot_destroy_all = lxcapi_snapshot_destroy_all;
4860 c->may_control = lxcapi_may_control;
4861 c->add_device_node = lxcapi_add_device_node;
4862 c->remove_device_node = lxcapi_remove_device_node;
4863 c->attach_interface = lxcapi_attach_interface;
4864 c->detach_interface = lxcapi_detach_interface;
4865 c->checkpoint = lxcapi_checkpoint;
4866 c->restore = lxcapi_restore;
4867 c->migrate = lxcapi_migrate;
4868 c->console_log = lxcapi_console_log;
4869
4870 return c;
4871
4872 err:
4873 lxc_container_free(c);
4874 return NULL;
4875 }
4876
4877 int lxc_get_wait_states(const char **states)
4878 {
4879 int i;
4880
4881 if (states)
4882 for (i=0; i<MAX_STATE; i++)
4883 states[i] = lxc_state2str(i);
4884 return MAX_STATE;
4885 }
4886
4887 /*
4888 * These next two could probably be done smarter with reusing a common function
4889 * with different iterators and tests...
4890 */
4891 int list_defined_containers(const char *lxcpath, char ***names, struct lxc_container ***cret)
4892 {
4893 DIR *dir;
4894 int i, cfound = 0, nfound = 0;
4895 struct dirent *direntp;
4896 struct lxc_container *c;
4897
4898 if (!lxcpath)
4899 lxcpath = lxc_global_config_value("lxc.lxcpath");
4900
4901 dir = opendir(lxcpath);
4902 if (!dir) {
4903 SYSERROR("opendir on lxcpath");
4904 return -1;
4905 }
4906
4907 if (cret)
4908 *cret = NULL;
4909 if (names)
4910 *names = NULL;
4911
4912 while ((direntp = readdir(dir))) {
4913 if (!direntp)
4914 break;
4915
4916 /* Ignore '.', '..' and any hidden directory. */
4917 if (!strncmp(direntp->d_name, ".", 1))
4918 continue;
4919
4920 if (!config_file_exists(lxcpath, direntp->d_name))
4921 continue;
4922
4923 if (names) {
4924 if (!add_to_array(names, direntp->d_name, cfound))
4925 goto free_bad;
4926 }
4927 cfound++;
4928
4929 if (!cret) {
4930 nfound++;
4931 continue;
4932 }
4933
4934 c = lxc_container_new(direntp->d_name, lxcpath);
4935 if (!c) {
4936 INFO("Container %s:%s has a config but could not be loaded",
4937 lxcpath, direntp->d_name);
4938 if (names)
4939 if(!remove_from_array(names, direntp->d_name, cfound--))
4940 goto free_bad;
4941 continue;
4942 }
4943 if (!do_lxcapi_is_defined(c)) {
4944 INFO("Container %s:%s has a config but is not defined",
4945 lxcpath, direntp->d_name);
4946 if (names)
4947 if(!remove_from_array(names, direntp->d_name, cfound--))
4948 goto free_bad;
4949 lxc_container_put(c);
4950 continue;
4951 }
4952
4953 if (!add_to_clist(cret, c, nfound, true)) {
4954 lxc_container_put(c);
4955 goto free_bad;
4956 }
4957 nfound++;
4958 }
4959
4960 closedir(dir);
4961 return nfound;
4962
4963 free_bad:
4964 if (names && *names) {
4965 for (i=0; i<cfound; i++)
4966 free((*names)[i]);
4967 free(*names);
4968 }
4969 if (cret && *cret) {
4970 for (i=0; i<nfound; i++)
4971 lxc_container_put((*cret)[i]);
4972 free(*cret);
4973 }
4974 closedir(dir);
4975 return -1;
4976 }
4977
4978 int list_active_containers(const char *lxcpath, char ***nret,
4979 struct lxc_container ***cret)
4980 {
4981 int i, ret = -1, cret_cnt = 0, ct_name_cnt = 0;
4982 int lxcpath_len;
4983 char *line = NULL;
4984 char **ct_name = NULL;
4985 size_t len = 0;
4986 struct lxc_container *c = NULL;
4987 bool is_hashed;
4988
4989 if (!lxcpath)
4990 lxcpath = lxc_global_config_value("lxc.lxcpath");
4991 lxcpath_len = strlen(lxcpath);
4992
4993 if (cret)
4994 *cret = NULL;
4995 if (nret)
4996 *nret = NULL;
4997
4998 FILE *f = fopen("/proc/net/unix", "r");
4999 if (!f)
5000 return -1;
5001
5002 while (getline(&line, &len, f) != -1) {
5003
5004 char *p = strrchr(line, ' '), *p2;
5005 if (!p)
5006 continue;
5007 p++;
5008 if (*p != 0x40)
5009 continue;
5010 p++;
5011
5012 is_hashed = false;
5013 if (strncmp(p, lxcpath, lxcpath_len) == 0) {
5014 p += lxcpath_len;
5015 } else if (strncmp(p, "lxc/", 4) == 0) {
5016 p += 4;
5017 is_hashed = true;
5018 } else {
5019 continue;
5020 }
5021
5022 while (*p == '/')
5023 p++;
5024
5025 /* Now p is the start of lxc_name. */
5026 p2 = strchr(p, '/');
5027 if (!p2 || strncmp(p2, "/command", 8) != 0)
5028 continue;
5029 *p2 = '\0';
5030
5031 if (is_hashed) {
5032 char *recvpath = lxc_cmd_get_lxcpath(p);
5033 if (!recvpath)
5034 continue;
5035 if (strncmp(lxcpath, recvpath, lxcpath_len) != 0) {
5036 free(recvpath);
5037 continue;
5038 }
5039 free(recvpath);
5040 p = lxc_cmd_get_name(p);
5041 if (!p)
5042 continue;
5043 }
5044
5045 if (array_contains(&ct_name, p, ct_name_cnt)) {
5046 if (is_hashed)
5047 free(p);
5048 continue;
5049 }
5050
5051 if (!add_to_array(&ct_name, p, ct_name_cnt)) {
5052 if (is_hashed)
5053 free(p);
5054 goto free_cret_list;
5055 }
5056
5057 ct_name_cnt++;
5058
5059 if (!cret) {
5060 if (is_hashed)
5061 free(p);
5062 continue;
5063 }
5064
5065 c = lxc_container_new(p, lxcpath);
5066 if (!c) {
5067 INFO("Container %s:%s is running but could not be loaded",
5068 lxcpath, p);
5069 remove_from_array(&ct_name, p, ct_name_cnt--);
5070 if (is_hashed)
5071 free(p);
5072 continue;
5073 }
5074
5075 if (is_hashed)
5076 free(p);
5077
5078 /*
5079 * If this is an anonymous container, then is_defined *can*
5080 * return false. So we don't do that check. Count on the
5081 * fact that the command socket exists.
5082 */
5083
5084 if (!add_to_clist(cret, c, cret_cnt, true)) {
5085 lxc_container_put(c);
5086 goto free_cret_list;
5087 }
5088 cret_cnt++;
5089 }
5090
5091 if (nret && cret && cret_cnt != ct_name_cnt) {
5092 if (c)
5093 lxc_container_put(c);
5094 goto free_cret_list;
5095 }
5096
5097 ret = ct_name_cnt;
5098 if (nret)
5099 *nret = ct_name;
5100 else
5101 goto free_ct_name;
5102 goto out;
5103
5104 free_cret_list:
5105 if (cret && *cret) {
5106 for (i = 0; i < cret_cnt; i++)
5107 lxc_container_put((*cret)[i]);
5108 free(*cret);
5109 }
5110
5111 free_ct_name:
5112 if (ct_name) {
5113 for (i = 0; i < ct_name_cnt; i++)
5114 free(ct_name[i]);
5115 free(ct_name);
5116 }
5117
5118 out:
5119 free(line);
5120
5121 fclose(f);
5122 return ret;
5123 }
5124
5125 int list_all_containers(const char *lxcpath, char ***nret,
5126 struct lxc_container ***cret)
5127 {
5128 int i, ret, active_cnt, ct_cnt, ct_list_cnt;
5129 char **active_name;
5130 char **ct_name;
5131 struct lxc_container **ct_list = NULL;
5132
5133 ct_cnt = list_defined_containers(lxcpath, &ct_name, NULL);
5134 if (ct_cnt < 0)
5135 return ct_cnt;
5136
5137 active_cnt = list_active_containers(lxcpath, &active_name, NULL);
5138 if (active_cnt < 0) {
5139 ret = active_cnt;
5140 goto free_ct_name;
5141 }
5142
5143 for (i = 0; i < active_cnt; i++) {
5144 if (!array_contains(&ct_name, active_name[i], ct_cnt)) {
5145 if (!add_to_array(&ct_name, active_name[i], ct_cnt)) {
5146 ret = -1;
5147 goto free_active_name;
5148 }
5149 ct_cnt++;
5150 }
5151 free(active_name[i]);
5152 active_name[i] = NULL;
5153 }
5154 free(active_name);
5155 active_name = NULL;
5156 active_cnt = 0;
5157
5158 for (i = 0, ct_list_cnt = 0; i < ct_cnt && cret; i++) {
5159 struct lxc_container *c;
5160
5161 c = lxc_container_new(ct_name[i], lxcpath);
5162 if (!c) {
5163 WARN("Container %s:%s could not be loaded", lxcpath, ct_name[i]);
5164 remove_from_array(&ct_name, ct_name[i], ct_cnt--);
5165 continue;
5166 }
5167
5168 if (!add_to_clist(&ct_list, c, ct_list_cnt, false)) {
5169 lxc_container_put(c);
5170 ret = -1;
5171 goto free_ct_list;
5172 }
5173 ct_list_cnt++;
5174 }
5175
5176 if (cret)
5177 *cret = ct_list;
5178
5179 if (nret)
5180 *nret = ct_name;
5181 else {
5182 ret = ct_cnt;
5183 goto free_ct_name;
5184 }
5185 return ct_cnt;
5186
5187 free_ct_list:
5188 for (i = 0; i < ct_list_cnt; i++) {
5189 lxc_container_put(ct_list[i]);
5190 }
5191 free(ct_list);
5192
5193 free_active_name:
5194 for (i = 0; i < active_cnt; i++) {
5195 free(active_name[i]);
5196 }
5197 free(active_name);
5198
5199 free_ct_name:
5200 for (i = 0; i < ct_cnt; i++) {
5201 free(ct_name[i]);
5202 }
5203 free(ct_name);
5204 return ret;
5205 }
5206
5207 bool lxc_config_item_is_supported(const char *key)
5208 {
5209 return !!lxc_get_config(key);
5210 }
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