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[mirror_lxc.git] / src / lxc / lxccontainer.c
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72d0e1cb
SG		 1/* liblxcapi
2 *
3 * Copyright © 2012 Serge Hallyn <serge.hallyn@ubuntu.com>.
4 * Copyright © 2012 Canonical Ltd.
5 *
d75462e4
SH		 6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
72d0e1cb
SG		 19 */
20
9be53773 21#define _GNU_SOURCE
0ea055b3 22#include <sys/mman.h>
148a9d27 23#include <assert.h>
a0e93eeb 24#include <stdarg.h>
71454076 25#include <pthread.h>
9be53773
SH		 26#include <unistd.h>
27#include <sys/types.h>
28#include <sys/wait.h>
4de2791f 29#include <sys/mount.h>
9be53773 30#include <errno.h>
93dc5327 31#include <fcntl.h>
9be53773 32#include <sched.h>
f5dd1d53 33#include <dirent.h>
f2363e38
ÇO		 34#include <sched.h>
35#include <arpa/inet.h>
36#include <libgen.h>
d659597e 37#include <stdint.h>
c476bdce 38#include <grp.h>
9fc7f8c0 39#include <stdio.h>
5f7eba0b 40#include <sys/syscall.h>
f2363e38
ÇO		 41
42#include <lxc/lxccontainer.h>
43#include <lxc/version.h>
e58fae8f 44#include <lxc/network.h>
f2363e38 45
9be53773 46#include "config.h"
72d0e1cb
SG		 47#include "lxc.h"
48#include "state.h"
72d0e1cb 49#include "conf.h"
72d0e1cb 50#include "confile.h"
b5159817 51#include "console.h"
72d0e1cb
SG		 52#include "cgroup.h"
53#include "commands.h"
e29fe1dd 54#include "criu.h"
72d0e1cb 55#include "log.h"
9be53773 56#include "bdev.h"
6a44839f 57#include "utils.h"
a0e93eeb 58#include "attach.h"
f2363e38
ÇO		 59#include "monitor.h"
60#include "namespace.h"
fed29fad 61#include "network.h"
95ee490b 62#include "lxclock.h"
735f2c6e 63#include "sync.h"
4ba0d9af
SG		 64
65#if HAVE_IFADDRS_H
9c83a661 66#include <ifaddrs.h>
4ba0d9af
SG		 67#else
68#include <../include/ifaddrs.h>
69#endif
72d0e1cb 70
684f79a5
SG		 71#if IS_BIONIC
72#include <../include/lxcmntent.h>
73#else
74#include <mntent.h>
75#endif
76
a9a0ed90
ÇO		 77#define MAX_BUFFER 4096
78
c868b261
ÇO		 79#define NOT_SUPPORTED_ERROR "the requested function %s is not currently supported with unprivileged containers"
80
5f7eba0b
SG		 81/* Define faccessat() if missing from the C library */
82#ifndef HAVE_FACCESSAT
83static int faccessat(int __fd, const char *__file, int __type, int __flag)
84{
85#ifdef __NR_faccessat
86return syscall(__NR_faccessat, __fd, __file, __type, __flag);
87#else
88errno = ENOSYS;
89return -1;
90#endif
91}
92#endif
93
72d0e1cb
SG		 94lxc_log_define(lxc_container, lxc);
95
858377e4
SH		 96static bool do_lxcapi_destroy(struct lxc_container *c);
97static const char *lxcapi_get_config_path(struct lxc_container *c);
98#define do_lxcapi_get_config_path(c) lxcapi_get_config_path(c)
99static bool do_lxcapi_set_config_item(struct lxc_container *c, const char *key, const char *v);
100static bool container_destroy(struct lxc_container *c);
101static bool get_snappath_dir(struct lxc_container *c, char *snappath);
102static bool lxcapi_snapshot_destroy_all(struct lxc_container *c);
103static bool do_lxcapi_save_config(struct lxc_container *c, const char *alt_file);
104
a41f104b
SH		 105static bool config_file_exists(const char *lxcpath, const char *cname)
106{
107 /* $lxcpath + '/' + $cname + '/config' + \0 */
108 int ret, len = strlen(lxcpath) + strlen(cname) + 9;
109 char *fname = alloca(len);
110
111 ret = snprintf(fname, len, "%s/%s/config", lxcpath, cname);
112 if (ret < 0 || ret >= len)
113 return false;
114
115 return file_exists(fname);
116}
117
3e625e2d
SH		 118/*
119 * A few functions to help detect when a container creation failed.
120 * If a container creation was killed partway through, then trying
121 * to actually start that container could harm the host. We detect
122 * this by creating a 'partial' file under the container directory,
123 * and keeping an advisory lock. When container creation completes,
124 * we remove that file. When we load or try to start a container, if
125 * we find that file, without a flock, we remove the container.
126 */
74a3920a 127static int ongoing_create(struct lxc_container *c)
3e625e2d
SH		 128{
129 int len = strlen(c->config_path) + strlen(c->name) + 10;
130 char *path = alloca(len);
131 int fd, ret;
93dc5327
SH		 132 struct flock lk;
133
3e625e2d
SH		 134 ret = snprintf(path, len, "%s/%s/partial", c->config_path, c->name);
135 if (ret < 0 || ret >= len) {
136 ERROR("Error writing partial pathname");
137 return -1;
138 }
139
140 if (!file_exists(path))
141 return 0;
025ed0f3 142 fd = open(path, O_RDWR);
025ed0f3 143 if (fd < 0) {
3e625e2d
SH		 144 // give benefit of the doubt
145 SYSERROR("Error opening partial file");
3e625e2d
SH		 146 return 0;
147 }
93dc5327
SH		 148 lk.l_type = F_WRLCK;
149 lk.l_whence = SEEK_SET;
150 lk.l_start = 0;
151 lk.l_len = 0;
152 lk.l_pid = -1;
153 if (fcntl(fd, F_GETLK, &lk) == 0 && lk.l_pid != -1) {
3e625e2d
SH		 154 // create is still ongoing
155 close(fd);
3e625e2d
SH		 156 return 1;
157 }
158 // create completed but partial is still there.
159 close(fd);
3e625e2d
SH		 160 return 2;
161}
162
74a3920a 163static int create_partial(struct lxc_container *c)
3e625e2d
SH		 164{
165 // $lxcpath + '/' + $name + '/partial' + \0
166 int len = strlen(c->config_path) + strlen(c->name) + 10;
167 char *path = alloca(len);
168 int fd, ret;
93dc5327
SH		 169 struct flock lk;
170
3e625e2d
SH		 171 ret = snprintf(path, len, "%s/%s/partial", c->config_path, c->name);
172 if (ret < 0 || ret >= len) {
173 ERROR("Error writing partial pathname");
174 return -1;
175 }
93dc5327 176 if ((fd=open(path, O_RDWR | O_CREAT | O_EXCL, 0755)) < 0) {
3e625e2d 177 SYSERROR("Erorr creating partial file");
3e625e2d
SH		 178 return -1;
179 }
93dc5327
SH		 180 lk.l_type = F_WRLCK;
181 lk.l_whence = SEEK_SET;
182 lk.l_start = 0;
183 lk.l_len = 0;
184 if (fcntl(fd, F_SETLKW, &lk) < 0) {
3e625e2d
SH		 185 SYSERROR("Error locking partial file %s", path);
186 close(fd);
3e625e2d
SH		 187 return -1;
188 }
3e625e2d
SH		 189
190 return fd;
191}
192
74a3920a 193static void remove_partial(struct lxc_container *c, int fd)
3e625e2d
SH		 194{
195 // $lxcpath + '/' + $name + '/partial' + \0
196 int len = strlen(c->config_path) + strlen(c->name) + 10;
197 char *path = alloca(len);
198 int ret;
199
200 close(fd);
201 ret = snprintf(path, len, "%s/%s/partial", c->config_path, c->name);
202 if (ret < 0 || ret >= len) {
203 ERROR("Error writing partial pathname");
204 return;
205 }
3e625e2d
SH		 206 if (unlink(path) < 0)
207 SYSERROR("Error unlink partial file %s", path);
3e625e2d
SH		 208}
209
72d0e1cb 210/* LOCKING
3bc449ed
SH		 211 * 1. container_mem_lock(c) protects the struct lxc_container from multiple threads.
212 * 2. container_disk_lock(c) protects the on-disk container data - in particular the
213 * container configuration file.
214 * The container_disk_lock also takes the container_mem_lock.
215 * 3. thread_mutex protects process data (ex: fd table) from multiple threads.
72d0e1cb
SG		 216 * NOTHING mutexes two independent programs with their own struct
217 * lxc_container for the same c->name, between API calls. For instance,
218 * c->config_read(); c->start(); Between those calls, data on disk
219 * could change (which shouldn't bother the caller unless for instance
220 * the rootfs get moved). c->config_read(); update; c->config_write();
221 * Two such updaters could race. The callers should therefore check their
222 * results. Trying to prevent that would necessarily expose us to deadlocks
223 * due to hung callers. So I prefer to keep the locks only within our own
224 * functions, not across functions.
225 *
3bc449ed 226 * If you're going to clone while holding a lxccontainer, increment
72d0e1cb
SG		 227 * c->numthreads (under privlock) before forking. When deleting,
228 * decrement numthreads under privlock, then if it hits 0 you can delete.
229 * Do not ever use a lxccontainer whose numthreads you did not bump.
230 */
231
232static void lxc_container_free(struct lxc_container *c)
233{
234 if (!c)
235 return;
236
f10fad2f
ME		 237 free(c->configfile);
238 c->configfile = NULL;
239 free(c->error_string);
240 c->error_string = NULL;
d95db067 241 if (c->slock) {
df271a59 242 lxc_putlock(c->slock);
d95db067
DE		 243 c->slock = NULL;
244 }
72d0e1cb 245 if (c->privlock) {
df271a59 246 lxc_putlock(c->privlock);
72d0e1cb
SG		 247 c->privlock = NULL;
248 }
f10fad2f
ME		 249 free(c->name);
250 c->name = NULL;
d95db067
DE		 251 if (c->lxc_conf) {
252 lxc_conf_free(c->lxc_conf);
253 c->lxc_conf = NULL;
254 }
f10fad2f
ME		 255 free(c->config_path);
256 c->config_path = NULL;
72cf75fa 257
72d0e1cb
SG		 258 free(c);
259}
260
43d1aa34
SH		 261/*
262 * Consider the following case:
263freer | racing get()er
264==================================================================
265lxc_container_put() | lxc_container_get()
266\ lxclock(c->privlock) | c->numthreads < 1? (no)
267\ c->numthreads = 0 | \ lxclock(c->privlock) -> waits
268\ lxcunlock() | \
269\ lxc_container_free() | \ lxclock() returns
270 | \ c->numthreads < 1 -> return 0
271\ \ (free stuff) |
272\ \ sem_destroy(privlock) |
273
274 * When the get()er checks numthreads the first time, one of the following
275 * is true:
276 * 1. freer has set numthreads = 0. get() returns 0
277 * 2. freer is between lxclock and setting numthreads to 0. get()er will
278 * sem_wait on privlock, get lxclock after freer() drops it, then see
279 * numthreads is 0 and exit without touching lxclock again..
280 * 3. freer has not yet locked privlock. If get()er runs first, then put()er
281 * will see --numthreads = 1 and not call lxc_container_free().
282*/
283
72d0e1cb
SG		 284int lxc_container_get(struct lxc_container *c)
285{
286 if (!c)
287 return 0;
288
43d1aa34
SH		 289 // if someone else has already started freeing the container, don't
290 // try to take the lock, which may be invalid
291 if (c->numthreads < 1)
292 return 0;
293
5cee8c50 294 if (container_mem_lock(c))
72d0e1cb
SG		 295 return 0;
296 if (c->numthreads < 1) {
297 // bail without trying to unlock, bc the privlock is now probably
298 // in freed memory
299 return 0;
300 }
301 c->numthreads++;
5cee8c50 302 container_mem_unlock(c);
72d0e1cb
SG		 303 return 1;
304}
305
306int lxc_container_put(struct lxc_container *c)
307{
308 if (!c)
309 return -1;
5cee8c50 310 if (container_mem_lock(c))
72d0e1cb
SG		 311 return -1;
312 if (--c->numthreads < 1) {
5cee8c50 313 container_mem_unlock(c);
72d0e1cb
SG		 314 lxc_container_free(c);
315 return 1;
316 }
5cee8c50 317 container_mem_unlock(c);
72d0e1cb
SG		 318 return 0;
319}
320
858377e4 321static bool do_lxcapi_is_defined(struct lxc_container *c)
72d0e1cb
SG		 322{
323 struct stat statbuf;
324 bool ret = false;
325 int statret;
326
327 if (!c)
328 return false;
329
5cee8c50 330 if (container_mem_lock(c))
72d0e1cb
SG		 331 return false;
332 if (!c->configfile)
333 goto out;
334 statret = stat(c->configfile, &statbuf);
335 if (statret != 0)
336 goto out;
337 ret = true;
338
339out:
5cee8c50 340 container_mem_unlock(c);
72d0e1cb
SG		 341 return ret;
342}
343
858377e4
SH		 344#define WRAP_API(rettype, fnname) \
345static rettype fnname(struct lxc_container *c) \
346{ \
347 rettype ret; \
348 current_config = c ? c->lxc_conf : NULL; \
349 ret = do_##fnname(c); \
350 current_config = NULL; \
351 return ret; \
352}
353
354#define WRAP_API_1(rettype, fnname, t1) \
355static rettype fnname(struct lxc_container *c, t1 a1) \
356{ \
357 rettype ret; \
358 current_config = c ? c->lxc_conf : NULL; \
359 ret = do_##fnname(c, a1); \
360 current_config = NULL; \
361 return ret; \
362}
363
364#define WRAP_API_2(rettype, fnname, t1, t2) \
365static rettype fnname(struct lxc_container *c, t1 a1, t2 a2) \
366{ \
367 rettype ret; \
368 current_config = c ? c->lxc_conf : NULL; \
369 ret = do_##fnname(c, a1, a2); \
370 current_config = NULL; \
371 return ret; \
372}
373
374#define WRAP_API_3(rettype, fnname, t1, t2, t3) \
375static rettype fnname(struct lxc_container *c, t1 a1, t2 a2, t3 a3) \
376{ \
377 rettype ret; \
378 current_config = c ? c->lxc_conf : NULL; \
379 ret = do_##fnname(c, a1, a2, a3); \
380 current_config = NULL; \
381 return ret; \
382}
383
384WRAP_API(bool, lxcapi_is_defined)
385
386static const char *do_lxcapi_state(struct lxc_container *c)
72d0e1cb 387{
72d0e1cb
SG		 388 lxc_state_t s;
389
390 if (!c)
391 return NULL;
13f5be62 392 s = lxc_getstate(c->name, c->config_path);
39dc698c 393 return lxc_state2str(s);
72d0e1cb
SG		 394}
395
858377e4
SH		 396WRAP_API(const char *, lxcapi_state)
397
39dc698c 398static bool is_stopped(struct lxc_container *c)
794dd120
SH		 399{
400 lxc_state_t s;
13f5be62 401 s = lxc_getstate(c->name, c->config_path);
794dd120
SH		 402 return (s == STOPPED);
403}
404
858377e4 405static bool do_lxcapi_is_running(struct lxc_container *c)
72d0e1cb
SG		 406{
407 const char *s;
408
409 if (!c)
410 return false;
858377e4 411 s = do_lxcapi_state(c);
72d0e1cb
SG		 412 if (!s || strcmp(s, "STOPPED") == 0)
413 return false;
414 return true;
415}
416
858377e4
SH		 417WRAP_API(bool, lxcapi_is_running)
418
419static bool do_lxcapi_freeze(struct lxc_container *c)
72d0e1cb
SG		 420{
421 int ret;
422 if (!c)
423 return false;
424
9123e471 425 ret = lxc_freeze(c->name, c->config_path);
72d0e1cb
SG		 426 if (ret)
427 return false;
428 return true;
429}
430
858377e4
SH		 431WRAP_API(bool, lxcapi_freeze)
432
433static bool do_lxcapi_unfreeze(struct lxc_container *c)
72d0e1cb
SG		 434{
435 int ret;
436 if (!c)
437 return false;
438
9123e471 439 ret = lxc_unfreeze(c->name, c->config_path);
72d0e1cb
SG		 440 if (ret)
441 return false;
442 return true;
443}
444
858377e4
SH		 445WRAP_API(bool, lxcapi_unfreeze)
446
447static int do_lxcapi_console_getfd(struct lxc_container *c, int *ttynum, int *masterfd)
0115f8fd
DE		 448{
449 int ttyfd;
450 if (!c)
451 return -1;
452
b5159817 453 ttyfd = lxc_console_getfd(c, ttynum, masterfd);
0115f8fd
DE		 454 return ttyfd;
455}
456
858377e4
SH		 457WRAP_API_2(int, lxcapi_console_getfd, int *, int *)
458
b5159817
DE		 459static int lxcapi_console(struct lxc_container *c, int ttynum, int stdinfd,
460 int stdoutfd, int stderrfd, int escape)
461{
858377e4
SH		 462 int ret;
463
464 if (!c)
465 return -1;
466
467 current_config = c->lxc_conf;
468 ret = lxc_console(c, ttynum, stdinfd, stdoutfd, stderrfd, escape);
469 current_config = NULL;
470 return ret;
b5159817
DE		 471}
472
858377e4 473static pid_t do_lxcapi_init_pid(struct lxc_container *c)
72d0e1cb 474{
72d0e1cb
SG		 475 if (!c)
476 return -1;
477
5cee8c50 478 return lxc_cmd_get_init_pid(c->name, c->config_path);
72d0e1cb
SG		 479}
480
858377e4
SH		 481WRAP_API(pid_t, lxcapi_init_pid)
482
12a50cc6 483static bool load_config_locked(struct lxc_container *c, const char *fname)
8eb5694b
SH		 484{
485 if (!c->lxc_conf)
486 c->lxc_conf = lxc_conf_init();
6b0d5538
SH		 487 if (!c->lxc_conf)
488 return false;
d08779d4
SH		 489 if (lxc_config_read(fname, c->lxc_conf, false) != 0)
490 return false;
d08779d4 491 return true;
8eb5694b
SH		 492}
493
858377e4 494static bool do_lxcapi_load_config(struct lxc_container *c, const char *alt_file)
72d0e1cb 495{
39dc698c
SH		 496 bool ret = false, need_disklock = false;
497 int lret;
12a50cc6 498 const char *fname;
72d0e1cb
SG		 499 if (!c)
500 return false;
501
502 fname = c->configfile;
503 if (alt_file)
504 fname = alt_file;
505 if (!fname)
506 return false;
39dc698c
SH		 507 /*
508 * If we're reading something other than the container's config,
509 * we only need to lock the in-memory container. If loading the
510 * container's config file, take the disk lock.
511 */
512 if (strcmp(fname, c->configfile) == 0)
513 need_disklock = true;
514
515 if (need_disklock)
516 lret = container_disk_lock(c);
517 else
518 lret = container_mem_lock(c);
519 if (lret)
72d0e1cb 520 return false;
39dc698c 521
8eb5694b 522 ret = load_config_locked(c, fname);
39dc698c
SH		 523
524 if (need_disklock)
525 container_disk_unlock(c);
526 else
527 container_mem_unlock(c);
72d0e1cb
SG		 528 return ret;
529}
530
858377e4
SH		 531WRAP_API_1(bool, lxcapi_load_config, const char *)
532
533static bool do_lxcapi_want_daemonize(struct lxc_container *c, bool state)
72d0e1cb 534{
497a2995 535 if (!c || !c->lxc_conf)
540f932a 536 return false;
f02abefe 537 if (container_mem_lock(c)) {
3bc449ed 538 ERROR("Error getting mem lock");
540f932a 539 return false;
3bc449ed 540 }
a2739df5 541 c->daemonize = state;
3bc449ed 542 container_mem_unlock(c);
540f932a 543 return true;
72d0e1cb
SG		 544}
545
858377e4
SH		 546WRAP_API_1(bool, lxcapi_want_daemonize, bool)
547
548static bool do_lxcapi_want_close_all_fds(struct lxc_container *c, bool state)
130a1888
ÇO		 549{
550 if (!c || !c->lxc_conf)
49badbbe 551 return false;
130a1888
ÇO		 552 if (container_mem_lock(c)) {
553 ERROR("Error getting mem lock");
49badbbe 554 return false;
130a1888 555 }
540f932a 556 c->lxc_conf->close_all_fds = state;
130a1888 557 container_mem_unlock(c);
49badbbe 558 return true;
130a1888
ÇO		 559}
560
858377e4
SH		 561WRAP_API_1(bool, lxcapi_want_close_all_fds, bool)
562
563static bool do_lxcapi_wait(struct lxc_container *c, const char *state, int timeout)
7a44c8b4
SG		 564{
565 int ret;
566
567 if (!c)
568 return false;
569
67e571de 570 ret = lxc_wait(c->name, state, timeout, c->config_path);
7a44c8b4
SG		 571 return ret == 0;
572}
573
858377e4 574WRAP_API_2(bool, lxcapi_wait, const char *, int)
7a44c8b4 575
858377e4 576static bool do_wait_on_daemonized_start(struct lxc_container *c, int pid)
7a44c8b4
SG		 577{
578 /* we'll probably want to make this timeout configurable? */
697fa639 579 int timeout = 5, ret, status;
7a44c8b4 580
697fa639
SH		 581 /*
582 * our child is going to fork again, then exit. reap the
583 * child
584 */
03f064ff 585 ret = waitpid(pid, &status, 0);
697fa639
SH		 586 if (ret == -1 || !WIFEXITED(status) || WEXITSTATUS(status) != 0)
587 DEBUG("failed waiting for first dual-fork child");
858377e4 588 return do_lxcapi_wait(c, "RUNNING", timeout);
7a44c8b4
SG		 589}
590
858377e4
SH		 591WRAP_API_1(bool, wait_on_daemonized_start, int)
592
2d834aa8
SH		 593static bool am_single_threaded(void)
594{
595 struct dirent dirent, *direntp;
596 DIR *dir;
597 int count=0;
598
2d834aa8 599 dir = opendir("/proc/self/task");
2d834aa8
SH		 600 if (!dir) {
601 INFO("failed to open /proc/self/task");
602 return false;
603 }
604
605 while (!readdir_r(dir, &dirent, &direntp)) {
606 if (!direntp)
607 break;
608
609 if (!strcmp(direntp->d_name, "."))
610 continue;
611
612 if (!strcmp(direntp->d_name, ".."))
613 continue;
614 if (++count > 1)
615 break;
616 }
2d834aa8 617 closedir(dir);
2d834aa8
SH		 618 return count == 1;
619}
620
72d0e1cb
SG		 621/*
622 * I can't decide if it'd be more convenient for callers if we accept '...',
623 * or a null-terminated array (i.e. execl vs execv)
624 */
858377e4 625static bool do_lxcapi_start(struct lxc_container *c, int useinit, char * const argv[])
72d0e1cb
SG		 626{
627 int ret;
628 struct lxc_conf *conf;
540f932a 629 bool daemonize = false;
6eaac303 630 FILE *pid_fp = NULL;
72d0e1cb
SG		 631 char *default_args[] = {
632 "/sbin/init",
13aad0ae 633 NULL,
72d0e1cb 634 };
67c660d0 635 char *init_cmd[2];
72d0e1cb
SG		 636
637 /* container exists */
638 if (!c)
639 return false;
640 /* container has been setup */
641 if (!c->lxc_conf)
642 return false;
643
3e625e2d
SH		 644 if ((ret = ongoing_create(c)) < 0) {
645 ERROR("Error checking for incomplete creation");
646 return false;
647 }
648 if (ret == 2) {
649 ERROR("Error: %s creation was not completed", c->name);
858377e4 650 do_lxcapi_destroy(c);
3e625e2d
SH		 651 return false;
652 } else if (ret == 1) {
653 ERROR("Error: creation of %s is ongoing", c->name);
654 return false;
655 }
656
72d0e1cb
SG		 657 /* is this app meant to be run through lxcinit, as in lxc-execute? */
658 if (useinit && !argv)
659 return false;
660
5cee8c50 661 if (container_mem_lock(c))
72d0e1cb
SG		 662 return false;
663 conf = c->lxc_conf;
664 daemonize = c->daemonize;
5cee8c50 665 container_mem_unlock(c);
72d0e1cb
SG		 666
667 if (useinit) {
507cee36 668 ret = lxc_execute(c->name, argv, 1, conf, c->config_path, daemonize);
72d0e1cb
SG		 669 return ret == 0 ? true : false;
670 }
671
67c660d0
SG		 672 if (!argv) {
673 if (conf->init_cmd) {
674 init_cmd[0] = conf->init_cmd;
675 init_cmd[1] = NULL;
676 argv = init_cmd;
677 }
678 else
679 argv = default_args;
680 }
72d0e1cb
SG		 681
682 /*
683 * say, I'm not sure - what locks do we want here? Any?
684 * Is liblxc's locking enough here to protect the on disk
685 * container? We don't want to exclude things like lxc_info
686 * while container is running...
687 */
688 if (daemonize) {
0a4be28d 689 char title[2048];
e51d4895 690 lxc_monitord_spawn(c->config_path);
71454076 691
72d0e1cb 692 pid_t pid = fork();
844f7a38 693 if (pid < 0)
72d0e1cb 694 return false;
6eaac303
QH		 695
696 if (pid != 0) {
697 /* Set to NULL because we don't want father unlink
698 * the PID file, child will do the free and unlink.
699 */
700 c->pidfile = NULL;
03f064ff 701 return wait_on_daemonized_start(c, pid);
6eaac303 702 }
025ed0f3 703
0a4be28d
TA		 704 /* We don't really care if this doesn't print all the
705 * characters; all that it means is that the proctitle will be
706 * ugly. Similarly, we also don't care if setproctitle()
707 * fails. */
708 snprintf(title, sizeof(title), "[lxc monitor] %s %s", c->config_path, c->name);
709 INFO("Attempting to set proc title to %s", title);
710 setproctitle(title);
711
697fa639
SH		 712 /* second fork to be reparented by init */
713 pid = fork();
714 if (pid < 0) {
715 SYSERROR("Error doing dual-fork");
13353dc4 716 exit(1);
697fa639
SH		 717 }
718 if (pid != 0)
719 exit(0);
72d0e1cb 720 /* like daemon(), chdir to / and redirect 0,1,2 to /dev/null */
c278cef2
SH		 721 if (chdir("/")) {
722 SYSERROR("Error chdir()ing to /.");
13353dc4 723 exit(1);
c278cef2 724 }
d2cf4c37 725 lxc_check_inherited(conf, true, -1);
69aeabac
TA		 726 if (null_stdfds() < 0) {
727 ERROR("failed to close fds");
13353dc4 728 exit(1);
69aeabac 729 }
72d0e1cb 730 setsid();
2d834aa8
SH		 731 } else {
732 if (!am_single_threaded()) {
733 ERROR("Cannot start non-daemonized container when threaded");
734 return false;
735 }
72d0e1cb
SG		 736 }
737
6eaac303
QH		 738 /* We need to write PID file after daeminize, so we always
739 * write the right PID.
740 */
741 if (c->pidfile) {
742 pid_fp = fopen(c->pidfile, "w");
743 if (pid_fp == NULL) {
744 SYSERROR("Failed to create pidfile '%s' for '%s'",
745 c->pidfile, c->name);
13353dc4
SH		 746 if (daemonize)
747 exit(1);
6eaac303
QH		 748 return false;
749 }
750
751 if (fprintf(pid_fp, "%d\n", getpid()) < 0) {
752 SYSERROR("Failed to write '%s'", c->pidfile);
753 fclose(pid_fp);
754 pid_fp = NULL;
13353dc4
SH		 755 if (daemonize)
756 exit(1);
6eaac303
QH		 757 return false;
758 }
759
760 fclose(pid_fp);
761 pid_fp = NULL;
762 }
763
72d0e1cb 764 conf->reboot = 0;
d2cf4c37 765
8bee8851 766reboot:
d2cf4c37
SH		 767 if (lxc_check_inherited(conf, daemonize, -1)) {
768 ERROR("Inherited fds found");
769 ret = 1;
770 goto out;
771 }
772
507cee36 773 ret = lxc_start(c->name, argv, conf, c->config_path, daemonize);
d4ef230c 774 c->error_num = ret;
72d0e1cb 775
8bee8851 776 if (conf->reboot == 1) {
72d0e1cb 777 INFO("container requested reboot");
8bee8851 778 conf->reboot = 2;
72d0e1cb
SG		 779 goto reboot;
780 }
781
d2cf4c37 782out:
487d8008
QH		 783 if (c->pidfile) {
784 unlink(c->pidfile);
785 free(c->pidfile);
786 c->pidfile = NULL;
787 }
788
844f7a38 789 if (daemonize)
05e5d7dc 790 exit (ret == 0 ? true : false);
844f7a38 791 else
05e5d7dc 792 return (ret == 0 ? true : false);
72d0e1cb
SG		 793}
794
858377e4
SH		 795static bool lxcapi_start(struct lxc_container *c, int useinit, char * const argv[])
796{
797 bool ret;
798 current_config = c ? c->lxc_conf : NULL;
799 ret = do_lxcapi_start(c, useinit, argv);
800 current_config = NULL;
801 return ret;
802}
803
72d0e1cb
SG		 804/*
805 * note there MUST be an ending NULL
806 */
807static bool lxcapi_startl(struct lxc_container *c, int useinit, ...)
808{
809 va_list ap;
a0e93eeb 810 char **inargs = NULL;
72d0e1cb
SG		 811 bool bret = false;
812
813 /* container exists */
814 if (!c)
815 return false;
816
858377e4
SH		 817 current_config = c->lxc_conf;
818
72d0e1cb 819 va_start(ap, useinit);
a0e93eeb 820 inargs = lxc_va_arg_list_to_argv(ap, 0, 1);
72d0e1cb
SG		 821 va_end(ap);
822
a0e93eeb
CS		 823 if (!inargs) {
824 ERROR("Memory allocation error.");
825 goto out;
72d0e1cb
SG		 826 }
827
a0e93eeb 828 /* pass NULL if no arguments were supplied */
858377e4 829 bret = do_lxcapi_start(c, useinit, *inargs ? inargs : NULL);
72d0e1cb
SG		 830
831out:
832 if (inargs) {
4e03ae57
DE		 833 char **arg;
834 for (arg = inargs; *arg; arg++)
835 free(*arg);
72d0e1cb
SG		 836 free(inargs);
837 }
838
858377e4 839 current_config = NULL;
72d0e1cb
SG		 840 return bret;
841}
842
858377e4 843static bool do_lxcapi_stop(struct lxc_container *c)
72d0e1cb
SG		 844{
845 int ret;
846
847 if (!c)
848 return false;
849
ef6e34ee 850 ret = lxc_cmd_stop(c->name, c->config_path);
72d0e1cb 851
d775f21b 852 return ret == 0;
72d0e1cb
SG		 853}
854
858377e4
SH		 855WRAP_API(bool, lxcapi_stop)
856
d5752559
SH		 857static int do_create_container_dir(const char *path, struct lxc_conf *conf)
858{
859 int ret = -1, lasterr;
860 char *p = alloca(strlen(path)+1);
861 mode_t mask = umask(0002);
862 ret = mkdir(path, 0770);
863 lasterr = errno;
864 umask(mask);
865 errno = lasterr;
866 if (ret) {
867 if (errno == EEXIST)
868 ret = 0;
869 else {
870 SYSERROR("failed to create container path %s", path);
871 return -1;
872 }
873 }
874 strcpy(p, path);
875 if (!lxc_list_empty(&conf->id_map) && chown_mapped_root(p, conf) != 0) {
876 ERROR("Failed to chown container dir");
877 ret = -1;
878 }
879 return ret;
880}
881
72d0e1cb
SG		 882/*
883 * create the standard expected container dir
884 */
885static bool create_container_dir(struct lxc_container *c)
886{
887 char *s;
888 int len, ret;
889
2a59a681 890 len = strlen(c->config_path) + strlen(c->name) + 2;
72d0e1cb
SG		 891 s = malloc(len);
892 if (!s)
893 return false;
2a59a681 894 ret = snprintf(s, len, "%s/%s", c->config_path, c->name);
72d0e1cb
SG		 895 if (ret < 0 || ret >= len) {
896 free(s);
897 return false;
898 }
d5752559 899 ret = do_create_container_dir(s, c->lxc_conf);
72d0e1cb
SG		 900 free(s);
901 return ret == 0;
902}
903
904/*
1897e3bc
SH		 905 * do_bdev_create: thin wrapper around bdev_create(). Like bdev_create(),
906 * it returns a mounted bdev on success, NULL on error.
72d0e1cb 907 */
1897e3bc
SH		 908static struct bdev *do_bdev_create(struct lxc_container *c, const char *type,
909 struct bdev_specs *specs)
910{
911 char *dest;
1897e3bc
SH		 912 size_t len;
913 struct bdev *bdev;
914 int ret;
915
cd219ae6
SY		 916 /* rootfs.path or lxcpath/lxcname/rootfs */
917 if (c->lxc_conf->rootfs.path && access(c->lxc_conf->rootfs.path, F_OK) == 0) {
cf465fe4
SH		 918 const char *rpath = c->lxc_conf->rootfs.path;
919 len = strlen(rpath) + 1;
cd219ae6 920 dest = alloca(len);
cf465fe4 921 ret = snprintf(dest, len, "%s", rpath);
cd219ae6 922 } else {
858377e4 923 const char *lxcpath = do_lxcapi_get_config_path(c);
cd219ae6
SY		 924 len = strlen(c->name) + strlen(lxcpath) + 9;
925 dest = alloca(len);
926 ret = snprintf(dest, len, "%s/%s/rootfs", lxcpath, c->name);
927 }
1897e3bc
SH		 928 if (ret < 0 || ret >= len)
929 return NULL;
930
931 bdev = bdev_create(dest, type, c->name, specs);
d44e88c2 932 if (!bdev) {
959aee9c 933 ERROR("Failed to create backing store type %s", type);
1897e3bc 934 return NULL;
d44e88c2
SH		 935 }
936
858377e4 937 do_lxcapi_set_config_item(c, "lxc.rootfs", bdev->src);
cf3ef16d
SH		 938
939 /* if we are not root, chown the rootfs dir to root in the
940 * target uidmap */
941
0e6e3a41 942 if (geteuid() != 0 || (c->lxc_conf && !lxc_list_empty(&c->lxc_conf->id_map))) {
c4d10a05 943 if (chown_mapped_root(bdev->dest, c->lxc_conf) < 0) {
959aee9c 944 ERROR("Error chowning %s to container root", bdev->dest);
97e9cfa0 945 suggest_default_idmap();
cf3ef16d
SH		 946 bdev_put(bdev);
947 return NULL;
948 }
949 }
950
1897e3bc
SH		 951 return bdev;
952}
953
96b3cb40 954static char *lxcbasename(char *path)
72d0e1cb 955{
96b3cb40
SH		 956 char *p = path + strlen(path) - 1;
957 while (*p != '/' && p > path)
958 p--;
959 return p;
960}
72d0e1cb 961
69aeabac 962static bool create_run_template(struct lxc_container *c, char *tpath, bool need_null_stdfds,
96b3cb40
SH		 963 char *const argv[])
964{
965 pid_t pid;
72d0e1cb 966
72d0e1cb 967 if (!tpath)
96b3cb40 968 return true;
72d0e1cb
SG		 969
970 pid = fork();
971 if (pid < 0) {
959aee9c 972 SYSERROR("failed to fork task for container creation template");
96b3cb40 973 return false;
72d0e1cb
SG		 974 }
975
976 if (pid == 0) { // child
1897e3bc
SH		 977 char *patharg, *namearg, *rootfsarg, *src;
978 struct bdev *bdev = NULL;
72d0e1cb 979 int i;
96b3cb40
SH		 980 int ret, len, nargs = 0;
981 char **newargv;
cf3ef16d 982 struct lxc_conf *conf = c->lxc_conf;
72d0e1cb 983
69aeabac
TA		 984 if (need_null_stdfds && null_stdfds() < 0) {
985 exit(1);
dc23c1c8 986 }
1897e3bc
SH		 987
988 src = c->lxc_conf->rootfs.path;
989 /*
1f92162d 990 * for an overlay create, what the user wants is the template to fill
1897e3bc
SH		 991 * in what will become the readonly lower layer. So don't mount for
992 * the template
993 */
1f92162d
SG		 994 if (strncmp(src, "overlayfs:", 10) == 0)
995 src = overlay_getlower(src+10);
996 if (strncmp(src, "aufs:", 5) == 0)
997 src = overlay_getlower(src+5);
998
76a26f55 999 bdev = bdev_init(c->lxc_conf, src, c->lxc_conf->rootfs.mount, NULL);
1897e3bc
SH		 1000 if (!bdev) {
1001 ERROR("Error opening rootfs");
1002 exit(1);
1003 }
1004
4de2791f 1005 if (geteuid() == 0) {
cf3ef16d
SH		 1006 if (unshare(CLONE_NEWNS) < 0) {
1007 ERROR("error unsharing mounts");
1008 exit(1);
1009 }
4de2791f 1010 if (detect_shared_rootfs()) {
c597baa8 1011 if (mount(NULL, "/", NULL, MS_SLAVE|MS_REC, NULL)) {
4de2791f
SH		 1012 SYSERROR("Failed to make / rslave to run template");
1013 ERROR("Continuing...");
1014 }
1015 }
1016 }
2659c7cb 1017 if (strcmp(bdev->type, "dir") && strcmp(bdev->type, "btrfs")) {
4de2791f 1018 if (geteuid() != 0) {
2659c7cb 1019 ERROR("non-root users can only create btrfs and directory-backed containers");
4de2791f
SH		 1020 exit(1);
1021 }
cf3ef16d
SH		 1022 if (bdev->ops->mount(bdev) < 0) {
1023 ERROR("Error mounting rootfs");
1024 exit(1);
1025 }
1026 } else { // TODO come up with a better way here!
f10fad2f 1027 free(bdev->dest);
cf3ef16d 1028 bdev->dest = strdup(bdev->src);
1897e3bc
SH		 1029 }
1030
72d0e1cb
SG		 1031 /*
1032 * create our new array, pre-pend the template name and
1033 * base args
1034 */
1035 if (argv)
1897e3bc 1036 for (nargs = 0; argv[nargs]; nargs++) ;
6849cb5b 1037 nargs += 4; // template, path, rootfs and name args
cf3ef16d 1038
72d0e1cb
SG		 1039 newargv = malloc(nargs * sizeof(*newargv));
1040 if (!newargv)
1041 exit(1);
96b3cb40 1042 newargv[0] = lxcbasename(tpath);
72d0e1cb 1043
2a59a681 1044 len = strlen(c->config_path) + strlen(c->name) + strlen("--path=") + 2;
72d0e1cb
SG		 1045 patharg = malloc(len);
1046 if (!patharg)
1047 exit(1);
2a59a681 1048 ret = snprintf(patharg, len, "--path=%s/%s", c->config_path, c->name);
72d0e1cb
SG		 1049 if (ret < 0 || ret >= len)
1050 exit(1);
1051 newargv[1] = patharg;
1052 len = strlen("--name=") + strlen(c->name) + 1;
1053 namearg = malloc(len);
1054 if (!namearg)
1055 exit(1);
1056 ret = snprintf(namearg, len, "--name=%s", c->name);
1057 if (ret < 0 || ret >= len)
1058 exit(1);
1059 newargv[2] = namearg;
1060
1897e3bc
SH		 1061 len = strlen("--rootfs=") + 1 + strlen(bdev->dest);
1062 rootfsarg = malloc(len);
1063 if (!rootfsarg)
1064 exit(1);
1065 ret = snprintf(rootfsarg, len, "--rootfs=%s", bdev->dest);
1066 if (ret < 0 || ret >= len)
1067 exit(1);
1068 newargv[3] = rootfsarg;
1069
72d0e1cb
SG		 1070 /* add passed-in args */
1071 if (argv)
1897e3bc
SH		 1072 for (i = 4; i < nargs; i++)
1073 newargv[i] = argv[i-4];
72d0e1cb
SG		 1074
1075 /* add trailing NULL */
1076 nargs++;
1077 newargv = realloc(newargv, nargs * sizeof(*newargv));
1078 if (!newargv)
1079 exit(1);
1080 newargv[nargs - 1] = NULL;
1081
cf3ef16d
SH		 1082 /*
1083 * If we're running the template in a mapped userns, then
1084 * we prepend the template command with:
1085 * lxc-usernsexec <-m map1> ... <-m mapn> --
57d116ab
SH		 1086 * and we append "--mapped-uid x", where x is the mapped uid
1087 * for our geteuid()
cf3ef16d 1088 */
0e6e3a41 1089 if (!lxc_list_empty(&conf->id_map)) {
cf3ef16d 1090 int n2args = 1;
57d116ab 1091 char txtuid[20];
2133f58c 1092 char txtgid[20];
cf3ef16d
SH		 1093 char **n2 = malloc(n2args * sizeof(*n2));
1094 struct lxc_list *it;
1095 struct id_map *map;
1096
57d116ab
SH		 1097 if (!n2) {
1098 SYSERROR("out of memory");
1099 exit(1);
1100 }
cf3ef16d
SH		 1101 newargv[0] = tpath;
1102 tpath = "lxc-usernsexec";
1103 n2[0] = "lxc-usernsexec";
1104 lxc_list_for_each(it, &conf->id_map) {
1105 map = it->elem;
1106 n2args += 2;
57d116ab 1107 n2 = realloc(n2, n2args * sizeof(char *));
cf3ef16d
SH		 1108 if (!n2)
1109 exit(1);
1110 n2[n2args-2] = "-m";
1111 n2[n2args-1] = malloc(200);
1112 if (!n2[n2args-1])
1113 exit(1);
1114 ret = snprintf(n2[n2args-1], 200, "%c:%lu:%lu:%lu",
1115 map->idtype == ID_TYPE_UID ? 'u' : 'g',
1116 map->nsid, map->hostid, map->range);
1117 if (ret < 0 || ret >= 200)
1118 exit(1);
1119 }
2133f58c 1120 int hostid_mapped = mapped_hostid(geteuid(), conf, ID_TYPE_UID);
6849cb5b 1121 int extraargs = hostid_mapped >= 0 ? 1 : 3;
57d116ab 1122 n2 = realloc(n2, (nargs + n2args + extraargs) * sizeof(char *));
cf3ef16d
SH		 1123 if (!n2)
1124 exit(1);
57d116ab 1125 if (hostid_mapped < 0) {
2133f58c 1126 hostid_mapped = find_unmapped_nsuid(conf, ID_TYPE_UID);
cf3ef16d 1127 n2[n2args++] = "-m";
57d116ab 1128 if (hostid_mapped < 0) {
cf3ef16d
SH		 1129 ERROR("Could not find free uid to map");
1130 exit(1);
1131 }
1132 n2[n2args++] = malloc(200);
1133 if (!n2[n2args-1]) {
1134 SYSERROR("out of memory");
1135 exit(1);
1136 }
1137 ret = snprintf(n2[n2args-1], 200, "u:%d:%d:1",
57d116ab 1138 hostid_mapped, geteuid());
cf3ef16d
SH		 1139 if (ret < 0 || ret >= 200) {
1140 ERROR("string too long");
1141 exit(1);
1142 }
1143 }
2133f58c
SH		 1144 int hostgid_mapped = mapped_hostid(getegid(), conf, ID_TYPE_GID);
1145 extraargs = hostgid_mapped >= 0 ? 1 : 3;
1146 n2 = realloc(n2, (nargs + n2args + extraargs) * sizeof(char *));
1147 if (!n2)
1148 exit(1);
1149 if (hostgid_mapped < 0) {
1150 hostgid_mapped = find_unmapped_nsuid(conf, ID_TYPE_GID);
1151 n2[n2args++] = "-m";
1152 if (hostgid_mapped < 0) {
1153 ERROR("Could not find free uid to map");
1154 exit(1);
1155 }
1156 n2[n2args++] = malloc(200);
1157 if (!n2[n2args-1]) {
1158 SYSERROR("out of memory");
1159 exit(1);
1160 }
1161 ret = snprintf(n2[n2args-1], 200, "g:%d:%d:1",
1162 hostgid_mapped, getegid());
1163 if (ret < 0 || ret >= 200) {
1164 ERROR("string too long");
1165 exit(1);
1166 }
1167 }
cf3ef16d
SH		 1168 n2[n2args++] = "--";
1169 for (i = 0; i < nargs; i++)
1170 n2[i + n2args] = newargv[i];
57d116ab
SH		 1171 n2args += nargs;
1172 // Finally add "--mapped-uid $uid" to tell template what to chown
1173 // cached images to
2133f58c 1174 n2args += 4;
57d116ab
SH		 1175 n2 = realloc(n2, n2args * sizeof(char *));
1176 if (!n2) {
1177 SYSERROR("out of memory");
1178 exit(1);
1179 }
1180 // note n2[n2args-1] is NULL
2133f58c 1181 n2[n2args-5] = "--mapped-uid";
57d116ab 1182 snprintf(txtuid, 20, "%d", hostid_mapped);
2133f58c
SH		 1183 n2[n2args-4] = txtuid;
1184 n2[n2args-3] = "--mapped-gid";
1185 snprintf(txtgid, 20, "%d", hostgid_mapped);
1186 n2[n2args-2] = txtgid;
57d116ab 1187 n2[n2args-1] = NULL;
cf3ef16d
SH		 1188 free(newargv);
1189 newargv = n2;
1190 }
72d0e1cb 1191 /* execute */
cf3ef16d 1192 execvp(tpath, newargv);
72d0e1cb
SG		 1193 SYSERROR("failed to execute template %s", tpath);
1194 exit(1);
1195 }
1196
9be53773 1197 if (wait_for_pid(pid) != 0) {
959aee9c 1198 ERROR("container creation template for %s failed", c->name);
96b3cb40
SH		 1199 return false;
1200 }
1201
1202 return true;
1203}
1204
74a3920a 1205static bool prepend_lxc_header(char *path, const char *t, char *const argv[])
3ce74686 1206{
1fd9bd50 1207 long flen;
b4569e93 1208 char *contents;
3ce74686 1209 FILE *f;
025ed0f3 1210 int ret = -1;
52026772 1211#if HAVE_LIBGNUTLS
025ed0f3 1212 int i;
3ce74686 1213 unsigned char md_value[SHA_DIGEST_LENGTH];
b4569e93 1214 char *tpath;
52026772 1215#endif
3ce74686 1216
025ed0f3 1217 f = fopen(path, "r");
025ed0f3 1218 if (f == NULL)
3ce74686 1219 return false;
025ed0f3
SH		 1220
1221 if (fseek(f, 0, SEEK_END) < 0)
1222 goto out_error;
1223 if ((flen = ftell(f)) < 0)
1224 goto out_error;
1225 if (fseek(f, 0, SEEK_SET) < 0)
1226 goto out_error;
1227 if ((contents = malloc(flen + 1)) == NULL)
1228 goto out_error;
1229 if (fread(contents, 1, flen, f) != flen)
1230 goto out_free_contents;
1231
3ce74686 1232 contents[flen] = '\0';
025ed0f3 1233 ret = fclose(f);
025ed0f3
SH		 1234 f = NULL;
1235 if (ret < 0)
1236 goto out_free_contents;
3ce74686 1237
b4569e93 1238#if HAVE_LIBGNUTLS
01efd4d3 1239 tpath = get_template_path(t);
85db5535 1240 if (!tpath) {
959aee9c 1241 ERROR("bad template: %s", t);
025ed0f3 1242 goto out_free_contents;
3ce74686
SH		 1243 }
1244
85db5535
DE		 1245 ret = sha1sum_file(tpath, md_value);
1246 if (ret < 0) {
1247 ERROR("Error getting sha1sum of %s", tpath);
3ce74686 1248 free(tpath);
85db5535 1249 goto out_free_contents;
3ce74686 1250 }
85db5535 1251 free(tpath);
3ce74686
SH		 1252#endif
1253
025ed0f3 1254 f = fopen(path, "w");
025ed0f3 1255 if (f == NULL) {
3ce74686
SH		 1256 SYSERROR("reopening config for writing");
1257 free(contents);
1258 return false;
1259 }
1260 fprintf(f, "# Template used to create this container: %s\n", t);
1261 if (argv) {
1262 fprintf(f, "# Parameters passed to the template:");
1263 while (*argv) {
1264 fprintf(f, " %s", *argv);
1265 argv++;
1266 }
1267 fprintf(f, "\n");
1268 }
1269#if HAVE_LIBGNUTLS
56698177
SH		 1270 fprintf(f, "# Template script checksum (SHA-1): ");
1271 for (i=0; i<SHA_DIGEST_LENGTH; i++)
1272 fprintf(f, "%02x", md_value[i]);
1273 fprintf(f, "\n");
3ce74686 1274#endif
0520c252 1275 fprintf(f, "# For additional config options, please look at lxc.container.conf(5)\n");
3ce74686
SH		 1276 if (fwrite(contents, 1, flen, f) != flen) {
1277 SYSERROR("Writing original contents");
1278 free(contents);
1279 fclose(f);
1280 return false;
1281 }
025ed0f3
SH		 1282 ret = 0;
1283out_free_contents:
3ce74686 1284 free(contents);
025ed0f3
SH		 1285out_error:
1286 if (f) {
1287 int newret;
025ed0f3 1288 newret = fclose(f);
025ed0f3
SH		 1289 if (ret == 0)
1290 ret = newret;
1291 }
1292 if (ret < 0) {
1293 SYSERROR("Error prepending header");
3ce74686
SH		 1294 return false;
1295 }
1296 return true;
1297}
1298
4df7f012
SH		 1299static void lxcapi_clear_config(struct lxc_container *c)
1300{
f979ac15
SH		 1301 if (c) {
1302 if (c->lxc_conf) {
1303 lxc_conf_free(c->lxc_conf);
1304 c->lxc_conf = NULL;
1305 }
4df7f012
SH		 1306 }
1307}
1308
858377e4
SH		 1309#define do_lxcapi_clear_config(c) lxcapi_clear_config(c)
1310
96b3cb40
SH		 1311/*
1312 * lxcapi_create:
1313 * create a container with the given parameters.
1314 * @c: container to be created. It has the lxcpath, name, and a starting
1315 * configuration already set
1316 * @t: the template to execute to instantiate the root filesystem and
1317 * adjust the configuration.
1318 * @bdevtype: backing store type to use. If NULL, dir will be used.
1319 * @specs: additional parameters for the backing store, i.e. LVM vg to
1320 * use.
1321 *
1322 * @argv: the arguments to pass to the template, terminated by NULL. If no
1323 * arguments, you can just pass NULL.
1324 */
858377e4 1325static bool do_lxcapi_create(struct lxc_container *c, const char *t,
dc23c1c8 1326 const char *bdevtype, struct bdev_specs *specs, int flags,
96b3cb40
SH		 1327 char *const argv[])
1328{
a69aad27 1329 bool ret = false;
96b3cb40 1330 pid_t pid;
85db5535 1331 char *tpath = NULL;
cbee8106 1332 int partial_fd;
96b3cb40
SH		 1333
1334 if (!c)
1335 return false;
1336
85db5535
DE		 1337 if (t) {
1338 tpath = get_template_path(t);
1339 if (!tpath) {
959aee9c 1340 ERROR("bad template: %s", t);
85db5535
DE		 1341 goto out;
1342 }
96b3cb40
SH		 1343 }
1344
cf465fe4
SH		 1345 /*
1346 * If a template is passed in, and the rootfs already is defined in
1347 * the container config and exists, then * caller is trying to create
1348 * an existing container. Return an error, but do NOT delete the
1349 * container.
1350 */
858377e4 1351 if (do_lxcapi_is_defined(c) && c->lxc_conf && c->lxc_conf->rootfs.path &&
cf465fe4
SH		 1352 access(c->lxc_conf->rootfs.path, F_OK) == 0 && tpath) {
1353 ERROR("Container %s:%s already exists", c->config_path, c->name);
6c6892b5 1354 goto free_tpath;
cf465fe4
SH		 1355 }
1356
6c6892b5 1357 if (!c->lxc_conf) {
858377e4 1358 if (!do_lxcapi_load_config(c, lxc_global_config_value("lxc.default_config"))) {
959aee9c 1359 ERROR("Error loading default configuration file %s", lxc_global_config_value("lxc.default_config"));
6c6892b5
DE		 1360 goto free_tpath;
1361 }
96b3cb40
SH		 1362 }
1363
6c6892b5
DE		 1364 if (!create_container_dir(c))
1365 goto free_tpath;
1366
0590e82c 1367 /*
0590e82c
SH		 1368 * if both template and rootfs.path are set, template is setup as rootfs.path.
1369 * container is already created if we have a config and rootfs.path is accessible
1370 */
00370edd
DW		 1371 if (!c->lxc_conf->rootfs.path && !tpath) {
1372 /* no template passed in and rootfs does not exist */
1373 if (!c->save_config(c, NULL)) {
1374 ERROR("failed to save starting configuration for %s\n", c->name);
1375 goto out;
1376 }
1377 ret = true;
0590e82c 1378 goto out;
00370edd 1379 }
0590e82c
SH		 1380 if (c->lxc_conf->rootfs.path && access(c->lxc_conf->rootfs.path, F_OK) != 0)
1381 /* rootfs passed into configuration, but does not exist: error */
1382 goto out;
858377e4 1383 if (do_lxcapi_is_defined(c) && c->lxc_conf->rootfs.path && !tpath) {
0590e82c
SH		 1384 /* Rootfs already existed, user just wanted to save the
1385 * loaded configuration */
1386 ret = true;
1387 goto out;
a69aad27 1388 }
96b3cb40
SH		 1389
1390 /* Mark that this container is being created */
1391 if ((partial_fd = create_partial(c)) < 0)
1392 goto out;
1393
1394 /* no need to get disk lock bc we have the partial locked */
1395
1396 /*
1397 * Create the backing store
1398 * Note we can't do this in the same task as we use to execute the
1399 * template because of the way zfs works.
1400 * After you 'zfs create', zfs mounts the fs only in the initial
1401 * namespace.
1402 */
1403 pid = fork();
1404 if (pid < 0) {
959aee9c 1405 SYSERROR("failed to fork task for container creation template");
8eb5694b
SH		 1406 goto out_unlock;
1407 }
1408
96b3cb40
SH		 1409 if (pid == 0) { // child
1410 struct bdev *bdev = NULL;
1411
1412 if (!(bdev = do_bdev_create(c, bdevtype, specs))) {
1413 ERROR("Error creating backing store type %s for %s",
1414 bdevtype ? bdevtype : "(none)", c->name);
1415 exit(1);
1416 }
1417
1418 /* save config file again to store the new rootfs location */
858377e4 1419 if (!do_lxcapi_save_config(c, NULL)) {
959aee9c 1420 ERROR("failed to save starting configuration for %s", c->name);
96b3cb40
SH		 1421 // parent task won't see bdev in config so we delete it
1422 bdev->ops->umount(bdev);
1423 bdev->ops->destroy(bdev);
1424 exit(1);
1425 }
1426 exit(0);
1427 }
1428 if (wait_for_pid(pid) != 0)
a09295f8 1429 goto out_unlock;
96b3cb40
SH		 1430
1431 /* reload config to get the rootfs */
a3b47c09 1432 lxc_conf_free(c->lxc_conf);
96b3cb40
SH		 1433 c->lxc_conf = NULL;
1434 if (!load_config_locked(c, c->configfile))
a09295f8 1435 goto out_unlock;
96b3cb40 1436
dc23c1c8 1437 if (!create_run_template(c, tpath, !!(flags & LXC_CREATE_QUIET), argv))
96b3cb40
SH		 1438 goto out_unlock;
1439
8eb5694b
SH		 1440 // now clear out the lxc_conf we have, reload from the created
1441 // container
858377e4 1442 do_lxcapi_clear_config(c);
3ce74686 1443
9d65a487
KY		 1444 if (t) {
1445 if (!prepend_lxc_header(c->configfile, tpath, argv)) {
1446 ERROR("Error prepending header to configuration file");
1447 goto out_unlock;
1448 }
3ce74686 1449 }
a69aad27 1450 ret = load_config_locked(c, c->configfile);
72d0e1cb
SG		 1451
1452out_unlock:
3e625e2d
SH		 1453 if (partial_fd >= 0)
1454 remove_partial(c, partial_fd);
72d0e1cb 1455out:
c55d4505 1456 if (!ret)
18aa217b 1457 container_destroy(c);
6c6892b5 1458free_tpath:
f10fad2f 1459 free(tpath);
a69aad27 1460 return ret;
72d0e1cb
SG		 1461}
1462
858377e4
SH		 1463static bool lxcapi_create(struct lxc_container *c, const char *t,
1464 const char *bdevtype, struct bdev_specs *specs, int flags,
1465 char *const argv[])
1466{
1467 bool ret;
1468 current_config = c ? c->lxc_conf : NULL;
1469 ret = do_lxcapi_create(c, t, bdevtype, specs, flags, argv);
1470 current_config = NULL;
1471 return ret;
1472}
1473
1474static bool do_lxcapi_reboot(struct lxc_container *c)
3e625e2d
SH		 1475{
1476 pid_t pid;
dd267776 1477 int rebootsignal = SIGINT;
3e625e2d
SH		 1478
1479 if (!c)
1480 return false;
858377e4 1481 if (!do_lxcapi_is_running(c))
3e625e2d 1482 return false;
858377e4 1483 pid = do_lxcapi_init_pid(c);
3e625e2d
SH		 1484 if (pid <= 0)
1485 return false;
dd267776
BP		 1486 if (c->lxc_conf && c->lxc_conf->rebootsignal)
1487 rebootsignal = c->lxc_conf->rebootsignal;
1488 if (kill(pid, rebootsignal) < 0)
3e625e2d
SH		 1489 return false;
1490 return true;
1491
1492}
1493
858377e4
SH		 1494WRAP_API(bool, lxcapi_reboot)
1495
1496static bool do_lxcapi_shutdown(struct lxc_container *c, int timeout)
72d0e1cb
SG		 1497{
1498 bool retv;
1499 pid_t pid;
f0f1d8c0 1500 int haltsignal = SIGPWR;
72d0e1cb
SG		 1501
1502 if (!c)
1503 return false;
1504
858377e4 1505 if (!do_lxcapi_is_running(c))
72d0e1cb 1506 return true;
858377e4 1507 pid = do_lxcapi_init_pid(c);
72d0e1cb
SG		 1508 if (pid <= 0)
1509 return true;
b0227444 1510 if (c->lxc_conf && c->lxc_conf->haltsignal)
f0f1d8c0
DE		 1511 haltsignal = c->lxc_conf->haltsignal;
1512 kill(pid, haltsignal);
858377e4 1513 retv = do_lxcapi_wait(c, "STOPPED", timeout);
72d0e1cb
SG		 1514 return retv;
1515}
1516
858377e4
SH		 1517WRAP_API_1(bool, lxcapi_shutdown, int)
1518
1897e3bc 1519static bool lxcapi_createl(struct lxc_container *c, const char *t,
dc23c1c8 1520 const char *bdevtype, struct bdev_specs *specs, int flags, ...)
72d0e1cb
SG		 1521{
1522 bool bret = false;
a0e93eeb 1523 char **args = NULL;
72d0e1cb 1524 va_list ap;
72d0e1cb
SG		 1525
1526 if (!c)
1527 return false;
1528
858377e4
SH		 1529 current_config = c->lxc_conf;
1530
72d0e1cb
SG		 1531 /*
1532 * since we're going to wait for create to finish, I don't think we
1533 * need to get a copy of the arguments.
1534 */
dc23c1c8 1535 va_start(ap, flags);
a0e93eeb 1536 args = lxc_va_arg_list_to_argv(ap, 0, 0);
72d0e1cb 1537 va_end(ap);
a0e93eeb
CS		 1538 if (!args) {
1539 ERROR("Memory allocation error.");
1540 goto out;
1541 }
72d0e1cb 1542
858377e4 1543 bret = do_lxcapi_create(c, t, bdevtype, specs, flags, args);
72d0e1cb
SG		 1544
1545out:
a0e93eeb 1546 free(args);
858377e4 1547 current_config = NULL;
72d0e1cb
SG		 1548 return bret;
1549}
1550
6b0d5538
SH		 1551static void do_clear_unexp_config_line(struct lxc_conf *conf, const char *key)
1552{
1553 if (strcmp(key, "lxc.cgroup") == 0)
1554 clear_unexp_config_line(conf, key, true);
1555 else if (strcmp(key, "lxc.network") == 0)
1556 clear_unexp_config_line(conf, key, true);
1557 else if (strcmp(key, "lxc.hook") == 0)
1558 clear_unexp_config_line(conf, key, true);
1559 else
1560 clear_unexp_config_line(conf, key, false);
1561 if (!do_append_unexp_config_line(conf, key, ""))
1562 WARN("Error clearing configuration for %s", key);
1563}
1564
858377e4 1565static bool do_lxcapi_clear_config_item(struct lxc_container *c, const char *key)
72d0e1cb
SG		 1566{
1567 int ret;
1568
1569 if (!c || !c->lxc_conf)
1570 return false;
5cee8c50 1571 if (container_mem_lock(c))
72d0e1cb 1572 return false;
72d0e1cb 1573 ret = lxc_clear_config_item(c->lxc_conf, key);
6b0d5538
SH		 1574 if (!ret)
1575 do_clear_unexp_config_line(c->lxc_conf, key);
5cee8c50 1576 container_mem_unlock(c);
72d0e1cb
SG		 1577 return ret == 0;
1578}
1579
858377e4
SH		 1580WRAP_API_1(bool, lxcapi_clear_config_item, const char *)
1581
e0f59189 1582static inline bool enter_net_ns(struct lxc_container *c)
51d0854c 1583{
858377e4 1584 pid_t pid = do_lxcapi_init_pid(c);
ae22a220 1585
0e6e3a41 1586 if ((geteuid() != 0 || (c->lxc_conf && !lxc_list_empty(&c->lxc_conf->id_map))) && access("/proc/self/ns/user", F_OK) == 0) {
51d0854c
DY		 1587 if (!switch_to_ns(pid, "user"))
1588 return false;
9c83a661 1589 }
51d0854c 1590 return switch_to_ns(pid, "net");
799f29ab
ÇO		 1591}
1592
9c88ff1f
ÇO		 1593// used by qsort and bsearch functions for comparing names
1594static inline int string_cmp(char **first, char **second)
1595{
1596 return strcmp(*first, *second);
1597}
1598
1599// used by qsort and bsearch functions for comparing container names
1600static inline int container_cmp(struct lxc_container **first, struct lxc_container **second)
1601{
1602 return strcmp((*first)->name, (*second)->name);
1603}
1604
1605static bool add_to_array(char ***names, char *cname, int pos)
1606{
1607 char **newnames = realloc(*names, (pos+1) * sizeof(char *));
1608 if (!newnames) {
1609 ERROR("Out of memory");
1610 return false;
1611 }
1612
1613 *names = newnames;
1614 newnames[pos] = strdup(cname);
1615 if (!newnames[pos])
1616 return false;
1617
1618 // sort the arrray as we will use binary search on it
1619 qsort(newnames, pos + 1, sizeof(char *), (int (*)(const void *,const void *))string_cmp);
1620
1621 return true;
1622}
1623
2871830a 1624static bool add_to_clist(struct lxc_container ***list, struct lxc_container *c, int pos, bool sort)
9c88ff1f
ÇO		 1625{
1626 struct lxc_container **newlist = realloc(*list, (pos+1) * sizeof(struct lxc_container *));
1627 if (!newlist) {
1628 ERROR("Out of memory");
1629 return false;
1630 }
1631
1632 *list = newlist;
1633 newlist[pos] = c;
1634
1635 // sort the arrray as we will use binary search on it
2871830a
DE		 1636 if (sort)
1637 qsort(newlist, pos + 1, sizeof(struct lxc_container *), (int (*)(const void *,const void *))container_cmp);
9c88ff1f
ÇO		 1638
1639 return true;
1640}
1641
1642static char** get_from_array(char ***names, char *cname, int size)
1643{
1644 return (char **)bsearch(&cname, *names, size, sizeof(char *), (int (*)(const void *, const void *))string_cmp);
1645}
1646
1647
1648static bool array_contains(char ***names, char *cname, int size) {
1649 if(get_from_array(names, cname, size) != NULL)
1650 return true;
1651 return false;
1652}
1653
1654static bool remove_from_array(char ***names, char *cname, int size)
1655{
1656 char **result = get_from_array(names, cname, size);
1657 if (result != NULL) {
1658 free(result);
1659 return true;
1660 }
1661 return false;
1662}
1663
858377e4 1664static char ** do_lxcapi_get_interfaces(struct lxc_container *c)
799f29ab 1665{
ae22a220
ÇO		 1666 pid_t pid;
1667 int i, count = 0, pipefd[2];
9c88ff1f 1668 char **interfaces = NULL;
ae22a220 1669 char interface[IFNAMSIZ];
799f29ab 1670
ae22a220
ÇO		 1671 if(pipe(pipefd) < 0) {
1672 SYSERROR("pipe failed");
1673 return NULL;
c868b261
ÇO		 1674 }
1675
ae22a220
ÇO		 1676 pid = fork();
1677 if (pid < 0) {
959aee9c 1678 SYSERROR("failed to fork task to get interfaces information");
ae22a220
ÇO		 1679 close(pipefd[0]);
1680 close(pipefd[1]);
1681 return NULL;
1682 }
799f29ab 1683
ae22a220
ÇO		 1684 if (pid == 0) { // child
1685 int ret = 1, nbytes;
1686 struct ifaddrs *interfaceArray = NULL, *tempIfAddr = NULL;
1687
1688 /* close the read-end of the pipe */
1689 close(pipefd[0]);
1690
e0f59189 1691 if (!enter_net_ns(c)) {
ae22a220
ÇO		 1692 SYSERROR("failed to enter namespace");
1693 goto out;
1694 }
1695
1696 /* Grab the list of interfaces */
1697 if (getifaddrs(&interfaceArray)) {
1698 SYSERROR("failed to get interfaces list");
1699 goto out;
1700 }
1701
1702 /* Iterate through the interfaces */
1703 for (tempIfAddr = interfaceArray; tempIfAddr != NULL; tempIfAddr = tempIfAddr->ifa_next) {
1704 nbytes = write(pipefd[1], tempIfAddr->ifa_name, IFNAMSIZ);
1705 if (nbytes < 0) {
1706 ERROR("write failed");
1707 goto out;
1708 }
1709 count++;
1710 }
1711 ret = 0;
1712
1713 out:
1714 if (interfaceArray)
1715 freeifaddrs(interfaceArray);
1716
1717 /* close the write-end of the pipe, thus sending EOF to the reader */
1718 close(pipefd[1]);
1719 exit(ret);
799f29ab
ÇO		 1720 }
1721
ae22a220
ÇO		 1722 /* close the write-end of the pipe */
1723 close(pipefd[1]);
1724
358afd84 1725 while (read(pipefd[0], &interface, IFNAMSIZ) == IFNAMSIZ) {
ae22a220
ÇO		 1726 if (array_contains(&interfaces, interface, count))
1727 continue;
799f29ab 1728
ae22a220
ÇO		 1729 if(!add_to_array(&interfaces, interface, count))
1730 ERROR("PARENT: add_to_array failed");
9c88ff1f
ÇO		 1731 count++;
1732 }
799f29ab 1733
ae22a220
ÇO		 1734 if (wait_for_pid(pid) != 0) {
1735 for(i=0;i<count;i++)
1736 free(interfaces[i]);
1737 free(interfaces);
1738 interfaces = NULL;
1739 }
9c88ff1f 1740
ae22a220
ÇO		 1741 /* close the read-end of the pipe */
1742 close(pipefd[0]);
799f29ab 1743
9c88ff1f
ÇO		 1744 /* Append NULL to the array */
1745 if(interfaces)
1746 interfaces = (char **)lxc_append_null_to_array((void **)interfaces, count);
799f29ab 1747
9c88ff1f 1748 return interfaces;
799f29ab
ÇO		 1749}
1750
858377e4
SH		 1751WRAP_API(char **, lxcapi_get_interfaces)
1752
1753static char** do_lxcapi_get_ips(struct lxc_container *c, const char* interface, const char* family, int scope)
799f29ab 1754{
ae22a220
ÇO		 1755 pid_t pid;
1756 int i, count = 0, pipefd[2];
9c88ff1f 1757 char **addresses = NULL;
ae22a220 1758 char address[INET6_ADDRSTRLEN];
799f29ab 1759
ae22a220
ÇO		 1760 if(pipe(pipefd) < 0) {
1761 SYSERROR("pipe failed");
1762 return NULL;
c868b261
ÇO		 1763 }
1764
ae22a220
ÇO		 1765 pid = fork();
1766 if (pid < 0) {
959aee9c 1767 SYSERROR("failed to fork task to get container ips");
ae22a220
ÇO		 1768 close(pipefd[0]);
1769 close(pipefd[1]);
1770 return NULL;
9c83a661
SG		 1771 }
1772
ae22a220
ÇO		 1773 if (pid == 0) { // child
1774 int ret = 1, nbytes;
1775 struct ifaddrs *interfaceArray = NULL, *tempIfAddr = NULL;
1776 char addressOutputBuffer[INET6_ADDRSTRLEN];
1777 void *tempAddrPtr = NULL;
1778 char *address = NULL;
fe218ca3 1779
ae22a220
ÇO		 1780 /* close the read-end of the pipe */
1781 close(pipefd[0]);
1782
e0f59189 1783 if (!enter_net_ns(c)) {
ae22a220
ÇO		 1784 SYSERROR("failed to enter namespace");
1785 goto out;
9c83a661 1786 }
ae22a220
ÇO		 1787
1788 /* Grab the list of interfaces */
1789 if (getifaddrs(&interfaceArray)) {
1790 SYSERROR("failed to get interfaces list");
1791 goto out;
1792 }
1793
1794 /* Iterate through the interfaces */
1795 for (tempIfAddr = interfaceArray; tempIfAddr != NULL; tempIfAddr = tempIfAddr->ifa_next) {
1796 if (tempIfAddr->ifa_addr == NULL)
9c83a661
SG		 1797 continue;
1798
ae22a220
ÇO		 1799 if(tempIfAddr->ifa_addr->sa_family == AF_INET) {
1800 if (family && strcmp(family, "inet"))
1801 continue;
1802 tempAddrPtr = &((struct sockaddr_in *)tempIfAddr->ifa_addr)->sin_addr;
1803 }
1804 else {
1805 if (family && strcmp(family, "inet6"))
1806 continue;
1807
1808 if (((struct sockaddr_in6 *)tempIfAddr->ifa_addr)->sin6_scope_id != scope)
1809 continue;
1810
1811 tempAddrPtr = &((struct sockaddr_in6 *)tempIfAddr->ifa_addr)->sin6_addr;
1812 }
1813
1814 if (interface && strcmp(interface, tempIfAddr->ifa_name))
1815 continue;
1816 else if (!interface && strcmp("lo", tempIfAddr->ifa_name) == 0)
9c83a661
SG		 1817 continue;
1818
ae22a220
ÇO		 1819 address = (char *)inet_ntop(tempIfAddr->ifa_addr->sa_family,
1820 tempAddrPtr,
1821 addressOutputBuffer,
1822 sizeof(addressOutputBuffer));
1823 if (!address)
1824 continue;
1825
1826 nbytes = write(pipefd[1], address, INET6_ADDRSTRLEN);
1827 if (nbytes < 0) {
1828 ERROR("write failed");
1829 goto out;
1830 }
1831 count++;
9c83a661 1832 }
ae22a220 1833 ret = 0;
9c83a661 1834
ae22a220
ÇO		 1835 out:
1836 if(interfaceArray)
1837 freeifaddrs(interfaceArray);
9c83a661 1838
ae22a220
ÇO		 1839 /* close the write-end of the pipe, thus sending EOF to the reader */
1840 close(pipefd[1]);
1841 exit(ret);
6849cb5b 1842 }
9c83a661 1843
ae22a220
ÇO		 1844 /* close the write-end of the pipe */
1845 close(pipefd[1]);
1846
358afd84 1847 while (read(pipefd[0], &address, INET6_ADDRSTRLEN) == INET6_ADDRSTRLEN) {
9c88ff1f 1848 if(!add_to_array(&addresses, address, count))
ae22a220 1849 ERROR("PARENT: add_to_array failed");
9c88ff1f 1850 count++;
9c83a661
SG		 1851 }
1852
ae22a220
ÇO		 1853 if (wait_for_pid(pid) != 0) {
1854 for(i=0;i<count;i++)
1855 free(addresses[i]);
1856 free(addresses);
1857 addresses = NULL;
1858 }
9c83a661 1859
ae22a220
ÇO		 1860 /* close the read-end of the pipe */
1861 close(pipefd[0]);
9c83a661
SG		 1862
1863 /* Append NULL to the array */
9c88ff1f
ÇO		 1864 if(addresses)
1865 addresses = (char **)lxc_append_null_to_array((void **)addresses, count);
9c83a661
SG		 1866
1867 return addresses;
1868}
1869
858377e4
SH		 1870WRAP_API_3(char **, lxcapi_get_ips, const char *, const char *, int)
1871
1872static int do_lxcapi_get_config_item(struct lxc_container *c, const char *key, char *retv, int inlen)
72d0e1cb
SG		 1873{
1874 int ret;
1875
1876 if (!c || !c->lxc_conf)
1877 return -1;
5cee8c50 1878 if (container_mem_lock(c))
72d0e1cb 1879 return -1;
72d0e1cb 1880 ret = lxc_get_config_item(c->lxc_conf, key, retv, inlen);
5cee8c50 1881 container_mem_unlock(c);
72d0e1cb
SG		 1882 return ret;
1883}
1884
858377e4
SH		 1885WRAP_API_3(int, lxcapi_get_config_item, const char *, char *, int)
1886
1887static char* do_lxcapi_get_running_config_item(struct lxc_container *c, const char *key)
8ac18377
ÇO		 1888{
1889 char *ret;
1890
1891 if (!c || !c->lxc_conf)
1892 return NULL;
1893 if (container_mem_lock(c))
1894 return NULL;
858377e4 1895 ret = lxc_cmd_get_config_item(c->name, key, do_lxcapi_get_config_path(c));
8ac18377
ÇO		 1896 container_mem_unlock(c);
1897 return ret;
1898}
1899
858377e4
SH		 1900WRAP_API_1(char *, lxcapi_get_running_config_item, const char *)
1901
1902static int do_lxcapi_get_keys(struct lxc_container *c, const char *key, char *retv, int inlen)
72d0e1cb
SG		 1903{
1904 if (!key)
1905 return lxc_listconfigs(retv, inlen);
1906 /*
1907 * Support 'lxc.network.<idx>', i.e. 'lxc.network.0'
1908 * This is an intelligent result to show which keys are valid given
1909 * the type of nic it is
1910 */
1911 if (!c || !c->lxc_conf)
1912 return -1;
5cee8c50 1913 if (container_mem_lock(c))
72d0e1cb
SG		 1914 return -1;
1915 int ret = -1;
1916 if (strncmp(key, "lxc.network.", 12) == 0)
6849cb5b 1917 ret = lxc_list_nicconfigs(c->lxc_conf, key, retv, inlen);
5cee8c50 1918 container_mem_unlock(c);
72d0e1cb
SG		 1919 return ret;
1920}
1921
858377e4
SH		 1922WRAP_API_3(int, lxcapi_get_keys, const char *, char *, int)
1923
1924static bool do_lxcapi_save_config(struct lxc_container *c, const char *alt_file)
72d0e1cb 1925{
39dc698c
SH		 1926 FILE *fout;
1927 bool ret = false, need_disklock = false;
1928 int lret;
1929
72d0e1cb
SG		 1930 if (!alt_file)
1931 alt_file = c->configfile;
1932 if (!alt_file)
6849cb5b 1933 return false; // should we write to stdout if no file is specified?
39dc698c
SH		 1934
1935 // If we haven't yet loaded a config, load the stock config
1936 if (!c->lxc_conf) {
858377e4 1937 if (!do_lxcapi_load_config(c, lxc_global_config_value("lxc.default_config"))) {
959aee9c 1938 ERROR("Error loading default configuration file %s while saving %s", lxc_global_config_value("lxc.default_config"), c->name);
72d0e1cb
SG		 1939 return false;
1940 }
39dc698c 1941 }
72d0e1cb 1942
5a3d2e1e
SG		 1943 if (!create_container_dir(c))
1944 return false;
1945
39dc698c
SH		 1946 /*
1947 * If we're writing to the container's config file, take the
1948 * disk lock. Otherwise just take the memlock to protect the
1949 * struct lxc_container while we're traversing it.
1950 */
1951 if (strcmp(c->configfile, alt_file) == 0)
1952 need_disklock = true;
1953
1954 if (need_disklock)
1955 lret = container_disk_lock(c);
1956 else
1957 lret = container_mem_lock(c);
1958
1959 if (lret)
72d0e1cb 1960 return false;
39dc698c
SH		 1961
1962 fout = fopen(alt_file, "w");
1963 if (!fout)
1964 goto out;
6b0d5538 1965 write_config(fout, c->lxc_conf);
72d0e1cb 1966 fclose(fout);
39dc698c
SH		 1967 ret = true;
1968
1969out:
1970 if (need_disklock)
1971 container_disk_unlock(c);
1972 else
1973 container_mem_unlock(c);
1974 return ret;
72d0e1cb
SG		 1975}
1976
858377e4
SH		 1977WRAP_API_1(bool, lxcapi_save_config, const char *)
1978
0ea055b3
CB		 1979
1980static bool mod_rdep(struct lxc_container *c0, struct lxc_container *c, bool inc)
dfb31b25 1981{
0ea055b3
CB		 1982 FILE *f1;
1983 struct stat fbuf;
1984 char *buf = NULL;
1985 char *del;
dfb31b25 1986 char path[MAXPATHLEN];
0ea055b3
CB		 1987 char newpath[MAXPATHLEN];
1988 int fd, ret, n = 0, v = 0;
dfb31b25 1989 bool bret = false;
0ea055b3 1990 size_t len;
dfb31b25 1991
0ea055b3 1992 if (container_disk_lock(c0))
dfb31b25 1993 return false;
0ea055b3
CB		 1994
1995 ret = snprintf(path, MAXPATHLEN, "%s/%s/lxc_snapshots", c0->config_path, c0->name);
dfb31b25
SH		 1996 if (ret < 0 || ret > MAXPATHLEN)
1997 goto out;
0ea055b3
CB		 1998 ret = snprintf(newpath, MAXPATHLEN, "%s\n%s\n", c->config_path, c->name);
1999 if (ret < 0 || ret > MAXPATHLEN)
dfb31b25 2000 goto out;
0ea055b3
CB		 2001
2002 /* If we find an lxc-snapshot file using the old format only listing the
2003 * number of snapshots we will keep using it. */
2004 f1 = fopen(path, "r");
2005 if (f1) {
2006 n = fscanf(f1, "%d", &v);
2007 fclose(f1);
2008 if (n == 1 && v == 0) {
2009 remove(path);
2010 n = 0;
2011 }
dfb31b25 2012 }
0ea055b3
CB		 2013 if (n == 1) {
2014 v += inc ? 1 : -1;
2015 f1 = fopen(path, "w");
2016 if (!f1)
2017 goto out;
2018 if (fprintf(f1, "%d\n", v) < 0) {
2019 ERROR("Error writing new snapshots value");
2020 fclose(f1);
2021 goto out;
2022 }
2023 ret = fclose(f1);
2024 if (ret != 0) {
2025 SYSERROR("Error writing to or closing snapshots file");
2026 goto out;
2027 }
2028 } else {
2029 /* Here we know that we have or can use an lxc-snapshot file
2030 * using the new format. */
2031 if (inc) {
2032 f1 = fopen(path, "a");
2033 if (!f1)
2034 goto out;
2035
2036 if (fprintf(f1, "%s", newpath) < 0) {
2037 ERROR("Error writing new snapshots entry");
2038 ret = fclose(f1);
2039 if (ret != 0)
2040 SYSERROR("Error writing to or closing snapshots file");
2041 goto out;
2042 }
2043
2044 ret = fclose(f1);
2045 if (ret != 0) {
2046 SYSERROR("Error writing to or closing snapshots file");
2047 goto out;
2048 }
2049 } else if (!inc) {
2050 fd = open(path, O_RDWR | O_CLOEXEC);
2051 if (fd < 0)
2052 goto out;
2053
2054 ret = fstat(fd, &fbuf);
2055 if (ret < 0) {
2056 close(fd);
2057 goto out;
2058 }
2059
2060 if (fbuf.st_size != 0) {
2061 buf = mmap(NULL, fbuf.st_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
2062 if (buf == MAP_FAILED) {
2063 SYSERROR("Failed to create mapping %s", path);
2064 close(fd);
2065 goto out;
2066 }
2067 }
2068
2069 len = strlen(newpath);
2070
2071 /* mmap()ed memory is only \0-terminated when it is not
2072 * a multiple of a pagesize. Hence, we'll use memmem(). */
2073 if ((del = memmem(buf, fbuf.st_size, newpath, len))) {
2074 /* remove container entry */
2075 memmove(del, del + len, strlen(del) - len + 1);
2076
2077 munmap(buf, fbuf.st_size);
2078
2079 if (ftruncate(fd, fbuf.st_size - len) < 0) {
2080 SYSERROR("Failed to truncate file %s", path);
2081 close(fd);
2082 goto out;
2083 }
2084 } else {
2085 munmap(buf, fbuf.st_size);
2086 }
2087
2088 close(fd);
2089 }
2090
2091 /* If the lxc-snapshot file is empty, remove it. */
2092 if (stat(path, &fbuf) < 0)
2093 goto out;
2094 if (!fbuf.st_size) {
2095 remove(path);
2096 }
dfb31b25
SH		 2097 }
2098
2099 bret = true;
2100
2101out:
0ea055b3 2102 container_disk_unlock(c0);
dfb31b25
SH		 2103 return bret;
2104}
2105
2106static void strip_newline(char *p)
2107{
2108 size_t len = strlen(p);
2109 if (len < 1)
2110 return;
2111 if (p[len-1] == '\n')
2112 p[len-1] = '\0';
2113}
2114
2115static void mod_all_rdeps(struct lxc_container *c, bool inc)
2116{
2117 struct lxc_container *p;
2118 char *lxcpath = NULL, *lxcname = NULL, path[MAXPATHLEN];
2119 size_t pathlen = 0, namelen = 0;
2120 FILE *f;
2121 int ret;
2122
2123 ret = snprintf(path, MAXPATHLEN, "%s/%s/lxc_rdepends",
2124 c->config_path, c->name);
2125 if (ret < 0 || ret >= MAXPATHLEN) {
2126 ERROR("Path name too long");
2127 return;
2128 }
025ed0f3 2129 f = fopen(path, "r");
025ed0f3 2130 if (f == NULL)
dfb31b25
SH		 2131 return;
2132 while (getline(&lxcpath, &pathlen, f) != -1) {
2133 if (getline(&lxcname, &namelen, f) == -1) {
959aee9c 2134 ERROR("badly formatted file %s", path);
dfb31b25
SH		 2135 goto out;
2136 }
2137 strip_newline(lxcpath);
2138 strip_newline(lxcname);
2139 if ((p = lxc_container_new(lxcname, lxcpath)) == NULL) {
2140 ERROR("Unable to find dependent container %s:%s",
2141 lxcpath, lxcname);
2142 continue;
2143 }
0ea055b3
CB		 2144 if (!mod_rdep(p, c, inc))
2145 ERROR("Failed to update snapshots file for %s:%s",
dfb31b25
SH		 2146 lxcpath, lxcname);
2147 lxc_container_put(p);
2148 }
2149out:
f10fad2f
ME		 2150 free(lxcpath);
2151 free(lxcname);
dfb31b25
SH		 2152 fclose(f);
2153}
2154
18aa217b 2155static bool has_fs_snapshots(struct lxc_container *c)
dfb31b25 2156{
0ea055b3 2157 FILE *f;
dfb31b25
SH		 2158 char path[MAXPATHLEN];
2159 int ret, v;
0ea055b3 2160 struct stat fbuf;
dfb31b25
SH		 2161 bool bret = false;
2162
2163 ret = snprintf(path, MAXPATHLEN, "%s/%s/lxc_snapshots", c->config_path,
2164 c->name);
2165 if (ret < 0 || ret > MAXPATHLEN)
2166 goto out;
0ea055b3
CB		 2167 /* If the file doesn't exist there are no snapshots. */
2168 if (stat(path, &fbuf) < 0)
dfb31b25 2169 goto out;
0ea055b3
CB		 2170 v = fbuf.st_size;
2171 if (v != 0) {
2172 f = fopen(path, "r");
2173 if (!f)
2174 goto out;
2175 ret = fscanf(f, "%d", &v);
2176 fclose(f);
2177 // TODO: Figure out what to do with the return value of fscanf.
2178 if (ret != 1)
2179 INFO("Container uses new lxc-snapshots format %s", path);
2180 }
dfb31b25
SH		 2181 bret = v != 0;
2182
2183out:
2184 return bret;
2185}
2186
18aa217b
SH		 2187static bool has_snapshots(struct lxc_container *c)
2188{
2189 char path[MAXPATHLEN];
2190 struct dirent dirent, *direntp;
2191 int count=0;
2192 DIR *dir;
2193
2194 if (!get_snappath_dir(c, path))
2195 return false;
2196 dir = opendir(path);
2197 if (!dir)
2198 return false;
2199 while (!readdir_r(dir, &dirent, &direntp)) {
2200 if (!direntp)
2201 break;
2202
2203 if (!strcmp(direntp->d_name, "."))
2204 continue;
2205
2206 if (!strcmp(direntp->d_name, ".."))
2207 continue;
2208 count++;
2209 break;
2210 }
2211 closedir(dir);
2212 return count > 0;
2213}
2214
4355ab5f
SH		 2215static int lxc_rmdir_onedev_wrapper(void *data)
2216{
2217 char *arg = (char *) data;
18aa217b 2218 return lxc_rmdir_onedev(arg, "snaps");
4355ab5f
SH		 2219}
2220
44a706bd
SH		 2221static int do_bdev_destroy(struct lxc_conf *conf)
2222{
2223 struct bdev *r;
2224 int ret = 0;
2225
76a26f55 2226 r = bdev_init(conf, conf->rootfs.path, conf->rootfs.mount, NULL);
44a706bd
SH		 2227 if (!r)
2228 return -1;
2229
2230 if (r->ops->destroy(r) < 0)
2231 ret = -1;
2232 bdev_put(r);
2233 return ret;
2234}
2235
2236static int bdev_destroy_wrapper(void *data)
2237{
2238 struct lxc_conf *conf = data;
2239
2240 if (setgid(0) < 0) {
2241 ERROR("Failed to setgid to 0");
2242 return -1;
2243 }
2244 if (setgroups(0, NULL) < 0)
2245 WARN("Failed to clear groups");
2246 if (setuid(0) < 0) {
2247 ERROR("Failed to setuid to 0");
2248 return -1;
2249 }
2250 return do_bdev_destroy(conf);
2251}
2252
18aa217b 2253static bool container_destroy(struct lxc_container *c)
72d0e1cb 2254{
c868b261 2255 bool bret = false;
fef48dc9 2256 int ret;
a70a69e8 2257 struct lxc_conf *conf;
72d0e1cb 2258
858377e4 2259 if (!c || !do_lxcapi_is_defined(c))
5a3d2e1e
SG		 2260 return false;
2261
a70a69e8 2262 conf = c->lxc_conf;
3bc449ed 2263 if (container_disk_lock(c))
72d0e1cb 2264 return false;
72d0e1cb 2265
39dc698c 2266 if (!is_stopped(c)) {
60bf62d4
SH		 2267 // we should queue some sort of error - in c->error_string?
2268 ERROR("container %s is not stopped", c->name);
2269 goto out;
72d0e1cb
SG		 2270 }
2271
a70a69e8 2272 if (conf && !lxc_list_empty(&conf->hooks[LXCHOOK_DESTROY])) {
37cf711b 2273 /* Start of environment variable setup for hooks */
ab7efcf5 2274 if (c->name && setenv("LXC_NAME", c->name, 1)) {
37cf711b
SY		 2275 SYSERROR("failed to set environment variable for container name");
2276 }
ab7efcf5 2277 if (conf->rcfile && setenv("LXC_CONFIG_FILE", conf->rcfile, 1)) {
37cf711b
SY		 2278 SYSERROR("failed to set environment variable for config path");
2279 }
ab7efcf5 2280 if (conf->rootfs.mount && setenv("LXC_ROOTFS_MOUNT", conf->rootfs.mount, 1)) {
37cf711b
SY		 2281 SYSERROR("failed to set environment variable for rootfs mount");
2282 }
ab7efcf5 2283 if (conf->rootfs.path && setenv("LXC_ROOTFS_PATH", conf->rootfs.path, 1)) {
37cf711b
SY		 2284 SYSERROR("failed to set environment variable for rootfs mount");
2285 }
2286 if (conf->console.path && setenv("LXC_CONSOLE", conf->console.path, 1)) {
2287 SYSERROR("failed to set environment variable for console path");
2288 }
2289 if (conf->console.log_path && setenv("LXC_CONSOLE_LOGPATH", conf->console.log_path, 1)) {
2290 SYSERROR("failed to set environment variable for console log");
2291 }
2292 /* End of environment variable setup for hooks */
2293
2294 if (run_lxc_hooks(c->name, "destroy", conf, c->get_config_path(c), NULL)) {
2295 ERROR("Error executing clone hook for %s", c->name);
2296 goto out;
2297 }
2298 }
2299
2300 if (current_config && conf == current_config) {
858377e4 2301 current_config = NULL;
37cf711b
SY		 2302 if (conf->logfd != -1) {
2303 close(conf->logfd);
2304 conf->logfd = -1;
858377e4
SH		 2305 }
2306 }
2307
37cf711b 2308 if (conf && conf->rootfs.path && conf->rootfs.mount) {
44a706bd 2309 if (am_unpriv())
37cf711b 2310 ret = userns_exec_1(conf, bdev_destroy_wrapper, conf);
44a706bd 2311 else
37cf711b 2312 ret = do_bdev_destroy(conf);
44a706bd
SH		 2313 if (ret < 0) {
2314 ERROR("Error destroying rootfs for %s", c->name);
2315 goto out;
60bf62d4
SH		 2316 }
2317 }
2318
dfb31b25
SH		 2319 mod_all_rdeps(c, false);
2320
858377e4 2321 const char *p1 = do_lxcapi_get_config_path(c);
60bf62d4
SH		 2322 char *path = alloca(strlen(p1) + strlen(c->name) + 2);
2323 sprintf(path, "%s/%s", p1, c->name);
c868b261 2324 if (am_unpriv())
37cf711b 2325 ret = userns_exec_1(conf, lxc_rmdir_onedev_wrapper, path);
4355ab5f 2326 else
18aa217b 2327 ret = lxc_rmdir_onedev(path, "snaps");
4355ab5f 2328 if (ret < 0) {
60bf62d4
SH		 2329 ERROR("Error destroying container directory for %s", c->name);
2330 goto out;
2331 }
fef48dc9 2332 bret = true;
60bf62d4
SH		 2333
2334out:
3bc449ed 2335 container_disk_unlock(c);
fef48dc9 2336 return bret;
72d0e1cb
SG		 2337}
2338
858377e4 2339static bool do_lxcapi_destroy(struct lxc_container *c)
18aa217b
SH		 2340{
2341 if (!c || !lxcapi_is_defined(c))
2342 return false;
2343 if (has_snapshots(c)) {
2344 ERROR("Container %s has snapshots; not removing", c->name);
2345 return false;
2346 }
2347
2348 if (has_fs_snapshots(c)) {
2349 ERROR("container %s has snapshots on its rootfs", c->name);
2350 return false;
2351 }
2352
2353 return container_destroy(c);
2354}
2355
858377e4 2356WRAP_API(bool, lxcapi_destroy)
18aa217b 2357
858377e4 2358static bool do_lxcapi_destroy_with_snapshots(struct lxc_container *c)
18aa217b
SH		 2359{
2360 if (!c || !lxcapi_is_defined(c))
2361 return false;
2362 if (!lxcapi_snapshot_destroy_all(c)) {
2363 ERROR("Error deleting all snapshots");
2364 return false;
2365 }
2366 return lxcapi_destroy(c);
2367}
2368
858377e4
SH		 2369WRAP_API(bool, lxcapi_destroy_with_snapshots)
2370
96532523
SH		 2371static bool set_config_item_locked(struct lxc_container *c, const char *key, const char *v)
2372{
2373 struct lxc_config_t *config;
2374
2375 if (!c->lxc_conf)
2376 c->lxc_conf = lxc_conf_init();
6b0d5538 2377 if (!c->lxc_conf)
96532523
SH		 2378 return false;
2379 config = lxc_getconfig(key);
2380 if (!config)
2381 return false;
6b0d5538 2382 if (config->cb(key, v, c->lxc_conf) != 0)
f979ac15 2383 return false;
6b0d5538 2384 return do_append_unexp_config_line(c->lxc_conf, key, v);
96532523
SH		 2385}
2386
858377e4 2387static bool do_lxcapi_set_config_item(struct lxc_container *c, const char *key, const char *v)
72d0e1cb 2388{
72d0e1cb 2389 bool b = false;
72d0e1cb
SG		 2390
2391 if (!c)
2392 return false;
2393
5cee8c50 2394 if (container_mem_lock(c))
72d0e1cb
SG		 2395 return false;
2396
96532523 2397 b = set_config_item_locked(c, key, v);
72d0e1cb 2398
5cee8c50 2399 container_mem_unlock(c);
72d0e1cb
SG		 2400 return b;
2401}
2402
858377e4
SH		 2403WRAP_API_2(bool, lxcapi_set_config_item, const char *, const char *)
2404
72d0e1cb
SG		 2405static char *lxcapi_config_file_name(struct lxc_container *c)
2406{
2407 if (!c || !c->configfile)
2408 return NULL;
2409 return strdup(c->configfile);
2410}
2411
2a59a681
SH		 2412static const char *lxcapi_get_config_path(struct lxc_container *c)
2413{
2414 if (!c || !c->config_path)
2415 return NULL;
2416 return (const char *)(c->config_path);
2417}
2418
afeecbba
SH		 2419/*
2420 * not for export
2421 * Just recalculate the c->configfile based on the
2422 * c->config_path, which must be set.
2423 * The lxc_container must be locked or not yet public.
2424 */
2425static bool set_config_filename(struct lxc_container *c)
2426{
2427 char *newpath;
2428 int len, ret;
2429
2430 if (!c->config_path)
2431 return false;
2432
2433 /* $lxc_path + "/" + c->name + "/" + "config" + '\0' */
2434 len = strlen(c->config_path) + strlen(c->name) + strlen("config") + 3;
2435 newpath = malloc(len);
2436 if (!newpath)
2437 return false;
2438
2439 ret = snprintf(newpath, len, "%s/%s/config", c->config_path, c->name);
2440 if (ret < 0 || ret >= len) {
2441 fprintf(stderr, "Error printing out config file name\n");
2442 free(newpath);
2443 return false;
2444 }
2445
f10fad2f 2446 free(c->configfile);
afeecbba
SH		 2447 c->configfile = newpath;
2448
2449 return true;
2450}
2451
858377e4 2452static bool do_lxcapi_set_config_path(struct lxc_container *c, const char *path)
2a59a681
SH		 2453{
2454 char *p;
2455 bool b = false;
afeecbba 2456 char *oldpath = NULL;
2a59a681
SH		 2457
2458 if (!c)
2459 return b;
2460
5cee8c50 2461 if (container_mem_lock(c))
2a59a681
SH		 2462 return b;
2463
2464 p = strdup(path);
afeecbba
SH		 2465 if (!p) {
2466 ERROR("Out of memory setting new lxc path");
2a59a681 2467 goto err;
afeecbba
SH		 2468 }
2469
2a59a681
SH		 2470 b = true;
2471 if (c->config_path)
afeecbba 2472 oldpath = c->config_path;
2a59a681 2473 c->config_path = p;
afeecbba
SH		 2474
2475 /* Since we've changed the config path, we have to change the
2476 * config file name too */
2477 if (!set_config_filename(c)) {
2478 ERROR("Out of memory setting new config filename");
2479 b = false;
2480 free(c->config_path);
2481 c->config_path = oldpath;
2482 oldpath = NULL;
2483 }
2a59a681 2484err:
f10fad2f 2485 free(oldpath);
5cee8c50 2486 container_mem_unlock(c);
2a59a681
SH		 2487 return b;
2488}
2489
858377e4 2490WRAP_API_1(bool, lxcapi_set_config_path, const char *)
2a59a681 2491
858377e4 2492static bool do_lxcapi_set_cgroup_item(struct lxc_container *c, const char *subsys, const char *value)
794dd120
SH		 2493{
2494 int ret;
794dd120
SH		 2495
2496 if (!c)
2497 return false;
2498
3bc449ed 2499 if (is_stopped(c))
794dd120
SH		 2500 return false;
2501
3bc449ed
SH		 2502 if (container_disk_lock(c))
2503 return false;
794dd120 2504
33ad9f1a 2505 ret = lxc_cgroup_set(subsys, value, c->name, c->config_path);
3bc449ed
SH		 2506
2507 container_disk_unlock(c);
2508 return ret == 0;
794dd120
SH		 2509}
2510
858377e4
SH		 2511WRAP_API_2(bool, lxcapi_set_cgroup_item, const char *, const char *)
2512
2513static int do_lxcapi_get_cgroup_item(struct lxc_container *c, const char *subsys, char *retv, int inlen)
794dd120 2514{
3bc449ed 2515 int ret;
794dd120 2516
6502006a 2517 if (!c)
794dd120
SH		 2518 return -1;
2519
3bc449ed 2520 if (is_stopped(c))
794dd120
SH		 2521 return -1;
2522
3bc449ed
SH		 2523 if (container_disk_lock(c))
2524 return -1;
794dd120 2525
33ad9f1a 2526 ret = lxc_cgroup_get(subsys, retv, inlen, c->name, c->config_path);
794dd120 2527
3bc449ed 2528 container_disk_unlock(c);
794dd120
SH		 2529 return ret;
2530}
2531
858377e4
SH		 2532WRAP_API_3(int, lxcapi_get_cgroup_item, const char *, char *, int)
2533
593e8478 2534const char *lxc_get_global_config_item(const char *key)
83c98d82 2535{
593e8478 2536 return lxc_global_config_value(key);
a8428dfa
SH		 2537}
2538
b6b918a1
SG		 2539const char *lxc_get_version(void)
2540{
95ee490b 2541 return LXC_VERSION;
b6b918a1
SG		 2542}
2543
f0ca2726 2544static int copy_file(const char *old, const char *new)
9be53773
SH		 2545{
2546 int in, out;
2547 ssize_t len, ret;
2548 char buf[8096];
2549 struct stat sbuf;
2550
2551 if (file_exists(new)) {
2552 ERROR("copy destination %s exists", new);
2553 return -1;
2554 }
2555 ret = stat(old, &sbuf);
2556 if (ret < 0) {
dfb31b25 2557 INFO("Error stat'ing %s", old);
9be53773
SH		 2558 return -1;
2559 }
2560
2561 in = open(old, O_RDONLY);
2562 if (in < 0) {
dfb31b25 2563 SYSERROR("Error opening original file %s", old);
9be53773
SH		 2564 return -1;
2565 }
2566 out = open(new, O_CREAT | O_EXCL | O_WRONLY, 0644);
2567 if (out < 0) {
dfb31b25 2568 SYSERROR("Error opening new file %s", new);
9be53773
SH		 2569 close(in);
2570 return -1;
2571 }
2572
2573 while (1) {
2574 len = read(in, buf, 8096);
2575 if (len < 0) {
dfb31b25 2576 SYSERROR("Error reading old file %s", old);
9be53773
SH		 2577 goto err;
2578 }
2579 if (len == 0)
2580 break;
2581 ret = write(out, buf, len);
6849cb5b 2582 if (ret < len) { // should we retry?
dfb31b25 2583 SYSERROR("Error: write to new file %s was interrupted", new);
9be53773
SH		 2584 goto err;
2585 }
2586 }
2587 close(in);
2588 close(out);
2589
2590 // we set mode, but not owner/group
2591 ret = chmod(new, sbuf.st_mode);
2592 if (ret) {
dfb31b25 2593 SYSERROR("Error setting mode on %s", new);
9be53773
SH		 2594 return -1;
2595 }
2596
2597 return 0;
2598
2599err:
2600 close(in);
2601 close(out);
2602 return -1;
2603}
2604
9be53773
SH		 2605static int copyhooks(struct lxc_container *oldc, struct lxc_container *c)
2606{
619256b5 2607 int i, len, ret;
9be53773 2608 struct lxc_list *it;
619256b5
ÇO		 2609 char *cpath;
2610
2611 len = strlen(oldc->config_path) + strlen(oldc->name) + 3;
2612 cpath = alloca(len);
2613 ret = snprintf(cpath, len, "%s/%s/", oldc->config_path, oldc->name);
2614 if (ret < 0 || ret >= len)
2615 return -1;
9be53773
SH		 2616
2617 for (i=0; i<NUM_LXC_HOOKS; i++) {
2618 lxc_list_for_each(it, &c->lxc_conf->hooks[i]) {
2619 char *hookname = it->elem;
c32981c3 2620 char *fname = strrchr(hookname, '/');
9be53773
SH		 2621 char tmppath[MAXPATHLEN];
2622 if (!fname) // relative path - we don't support, but maybe we should
2623 return 0;
619256b5
ÇO		 2624 if (strncmp(hookname, cpath, len - 1) != 0) {
2625 // this hook is public - ignore
2626 continue;
2627 }
9be53773
SH		 2628 // copy the script, and change the entry in confile
2629 ret = snprintf(tmppath, MAXPATHLEN, "%s/%s/%s",
2630 c->config_path, c->name, fname+1);
2631 if (ret < 0 || ret >= MAXPATHLEN)
2632 return -1;
2633 ret = copy_file(it->elem, tmppath);
2634 if (ret < 0)
2635 return -1;
2636 free(it->elem);
2637 it->elem = strdup(tmppath);
2638 if (!it->elem) {
2639 ERROR("out of memory copying hook path");
2640 return -1;
2641 }
9be53773
SH		 2642 }
2643 }
2644
67702c21
SH		 2645 if (!clone_update_unexp_hooks(c->lxc_conf, oldc->config_path,
2646 c->config_path, oldc->name, c->name)) {
6b0d5538
SH		 2647 ERROR("Error saving new hooks in clone");
2648 return -1;
2649 }
858377e4 2650 do_lxcapi_save_config(c, NULL);
9be53773
SH		 2651 return 0;
2652}
2653
9be53773
SH		 2654
2655static int copy_fstab(struct lxc_container *oldc, struct lxc_container *c)
2656{
2657 char newpath[MAXPATHLEN];
2658 char *oldpath = oldc->lxc_conf->fstab;
2659 int ret;
2660
2661 if (!oldpath)
2662 return 0;
2663
6b0d5538
SH		 2664 clear_unexp_config_line(c->lxc_conf, "lxc.mount", false);
2665
c32981c3 2666 char *p = strrchr(oldpath, '/');
9be53773
SH		 2667 if (!p)
2668 return -1;
2669 ret = snprintf(newpath, MAXPATHLEN, "%s/%s%s",
2670 c->config_path, c->name, p);
2671 if (ret < 0 || ret >= MAXPATHLEN) {
2672 ERROR("error printing new path for %s", oldpath);
2673 return -1;
2674 }
2675 if (file_exists(newpath)) {
2676 ERROR("error: fstab file %s exists", newpath);
2677 return -1;
2678 }
2679
2680 if (copy_file(oldpath, newpath) < 0) {
2681 ERROR("error: copying %s to %s", oldpath, newpath);
2682 return -1;
2683 }
2684 free(c->lxc_conf->fstab);
2685 c->lxc_conf->fstab = strdup(newpath);
2686 if (!c->lxc_conf->fstab) {
2687 ERROR("error: allocating pathname");
2688 return -1;
2689 }
6b0d5538
SH		 2690 if (!do_append_unexp_config_line(c->lxc_conf, "lxc.mount", newpath)) {
2691 ERROR("error saving new lxctab");
2692 return -1;
2693 }
9be53773
SH		 2694
2695 return 0;
2696}
2697
dfb31b25
SH		 2698static void copy_rdepends(struct lxc_container *c, struct lxc_container *c0)
2699{
2700 char path0[MAXPATHLEN], path1[MAXPATHLEN];
2701 int ret;
2702
2703 ret = snprintf(path0, MAXPATHLEN, "%s/%s/lxc_rdepends", c0->config_path,
2704 c0->name);
2705 if (ret < 0 || ret >= MAXPATHLEN) {
2706 WARN("Error copying reverse dependencies");
2707 return;
2708 }
2709 ret = snprintf(path1, MAXPATHLEN, "%s/%s/lxc_rdepends", c->config_path,
2710 c->name);
2711 if (ret < 0 || ret >= MAXPATHLEN) {
2712 WARN("Error copying reverse dependencies");
2713 return;
2714 }
2715 if (copy_file(path0, path1) < 0) {
2716 INFO("Error copying reverse dependencies");
2717 return;
2718 }
2719}
2720
2721static bool add_rdepends(struct lxc_container *c, struct lxc_container *c0)
2722{
2723 int ret;
2724 char path[MAXPATHLEN];
2725 FILE *f;
2726 bool bret;
2727
2728 ret = snprintf(path, MAXPATHLEN, "%s/%s/lxc_rdepends", c->config_path,
2729 c->name);
2730 if (ret < 0 || ret >= MAXPATHLEN)
2731 return false;
2732 f = fopen(path, "a");
2733 if (!f)
2734 return false;
2735 bret = true;
2736 // if anything goes wrong, just return an error
2737 if (fprintf(f, "%s\n%s\n", c0->config_path, c0->name) < 0)
2738 bret = false;
2739 if (fclose(f) != 0)
2740 bret = false;
2741 return bret;
2742}
2743
9be53773 2744static int copy_storage(struct lxc_container *c0, struct lxc_container *c,
d659597e 2745 const char *newtype, int flags, const char *bdevdata, uint64_t newsize)
9be53773
SH		 2746{
2747 struct bdev *bdev;
dfb31b25 2748 int need_rdep;
9be53773 2749
1354955b 2750 bdev = bdev_copy(c0, c->name, c->config_path, newtype, flags,
dfb31b25 2751 bdevdata, newsize, &need_rdep);
9be53773 2752 if (!bdev) {
dfb31b25 2753 ERROR("Error copying storage");
9be53773
SH		 2754 return -1;
2755 }
2756 free(c->lxc_conf->rootfs.path);
2757 c->lxc_conf->rootfs.path = strdup(bdev->src);
2758 bdev_put(bdev);
dfb31b25
SH		 2759 if (!c->lxc_conf->rootfs.path) {
2760 ERROR("Out of memory while setting storage path");
9be53773 2761 return -1;
dfb31b25 2762 }
6b0d5538
SH		 2763 // We will simply append a new lxc.rootfs entry to the unexpanded config
2764 clear_unexp_config_line(c->lxc_conf, "lxc.rootfs", false);
2765 if (!do_append_unexp_config_line(c->lxc_conf, "lxc.rootfs", c->lxc_conf->rootfs.path)) {
222dc581 2766 ERROR("Error saving new rootfs to cloned config");
d0218321
SH		 2767 return -1;
2768 }
eee59f94
SH		 2769 if (flags & LXC_CLONE_SNAPSHOT)
2770 copy_rdepends(c, c0);
dfb31b25
SH		 2771 if (need_rdep) {
2772 if (!add_rdepends(c, c0))
2773 WARN("Error adding reverse dependency from %s to %s",
2774 c->name, c0->name);
2775 }
2776
2777 mod_all_rdeps(c, true);
2778
9be53773
SH		 2779 return 0;
2780}
2781
1354955b
SH		 2782struct clone_update_data {
2783 struct lxc_container *c0;
2784 struct lxc_container *c1;
2785 int flags;
2786 char **hookargs;
2787};
2788
2789static int clone_update_rootfs(struct clone_update_data *data)
9be53773 2790{
1354955b
SH		 2791 struct lxc_container *c0 = data->c0;
2792 struct lxc_container *c = data->c1;
2793 int flags = data->flags;
2794 char **hookargs = data->hookargs;
9be53773
SH		 2795 int ret = -1;
2796 char path[MAXPATHLEN];
2797 struct bdev *bdev;
2798 FILE *fout;
148e91f5 2799 struct lxc_conf *conf = c->lxc_conf;
9be53773
SH		 2800
2801 /* update hostname in rootfs */
2802 /* we're going to mount, so run in a clean namespace to simplify cleanup */
2803
1354955b
SH		 2804 if (setgid(0) < 0) {
2805 ERROR("Failed to setgid to 0");
2806 return -1;
2807 }
2808 if (setuid(0) < 0) {
2809 ERROR("Failed to setuid to 0");
9be53773 2810 return -1;
1354955b 2811 }
c476bdce
SH		 2812 if (setgroups(0, NULL) < 0)
2813 WARN("Failed to clear groups");
9be53773 2814
1354955b
SH		 2815 if (unshare(CLONE_NEWNS) < 0)
2816 return -1;
76a26f55 2817 bdev = bdev_init(c->lxc_conf, c->lxc_conf->rootfs.path, c->lxc_conf->rootfs.mount, NULL);
9be53773 2818 if (!bdev)
1354955b 2819 return -1;
cf3ef16d
SH		 2820 if (strcmp(bdev->type, "dir") != 0) {
2821 if (unshare(CLONE_NEWNS) < 0) {
2822 ERROR("error unsharing mounts");
e7de366c 2823 bdev_put(bdev);
1354955b 2824 return -1;
cf3ef16d 2825 }
2c6f3fc9
SH		 2826 if (detect_shared_rootfs()) {
2827 if (mount(NULL, "/", NULL, MS_SLAVE|MS_REC, NULL)) {
2828 SYSERROR("Failed to make / rslave");
2829 ERROR("Continuing...");
2830 }
2831 }
e7de366c
SG		 2832 if (bdev->ops->mount(bdev) < 0) {
2833 bdev_put(bdev);
1354955b 2834 return -1;
e7de366c 2835 }
cf3ef16d 2836 } else { // TODO come up with a better way
f10fad2f 2837 free(bdev->dest);
cf3ef16d
SH		 2838 bdev->dest = strdup(bdev->src);
2839 }
148e91f5
SH		 2840
2841 if (!lxc_list_empty(&conf->hooks[LXCHOOK_CLONE])) {
2842 /* Start of environment variable setup for hooks */
ab7efcf5 2843 if (c0->name && setenv("LXC_SRC_NAME", c0->name, 1)) {
1143ed39
DE		 2844 SYSERROR("failed to set environment variable for source container name");
2845 }
ab7efcf5 2846 if (c->name && setenv("LXC_NAME", c->name, 1)) {
148e91f5
SH		 2847 SYSERROR("failed to set environment variable for container name");
2848 }
ab7efcf5 2849 if (conf->rcfile && setenv("LXC_CONFIG_FILE", conf->rcfile, 1)) {
148e91f5
SH		 2850 SYSERROR("failed to set environment variable for config path");
2851 }
ab7efcf5 2852 if (bdev->dest && setenv("LXC_ROOTFS_MOUNT", bdev->dest, 1)) {
148e91f5
SH		 2853 SYSERROR("failed to set environment variable for rootfs mount");
2854 }
ab7efcf5 2855 if (conf->rootfs.path && setenv("LXC_ROOTFS_PATH", conf->rootfs.path, 1)) {
148e91f5
SH		 2856 SYSERROR("failed to set environment variable for rootfs mount");
2857 }
2858
283678ed 2859 if (run_lxc_hooks(c->name, "clone", conf, c->get_config_path(c), hookargs)) {
148e91f5 2860 ERROR("Error executing clone hook for %s", c->name);
e7de366c 2861 bdev_put(bdev);
1354955b 2862 return -1;
148e91f5
SH		 2863 }
2864 }
2865
2866 if (!(flags & LXC_CLONE_KEEPNAME)) {
2867 ret = snprintf(path, MAXPATHLEN, "%s/etc/hostname", bdev->dest);
e7de366c
SG		 2868 bdev_put(bdev);
2869
148e91f5 2870 if (ret < 0 || ret >= MAXPATHLEN)
1354955b 2871 return -1;
8058be39 2872 if (!file_exists(path))
1354955b 2873 return 0;
148e91f5 2874 if (!(fout = fopen(path, "w"))) {
959aee9c 2875 SYSERROR("unable to open %s: ignoring", path);
1354955b 2876 return 0;
148e91f5 2877 }
a684f0b7
ÇO		 2878 if (fprintf(fout, "%s", c->name) < 0) {
2879 fclose(fout);
1354955b 2880 return -1;
6849cb5b 2881 }
148e91f5 2882 if (fclose(fout) < 0)
1354955b 2883 return -1;
9be53773 2884 }
e7de366c
SG		 2885 else
2886 bdev_put(bdev);
2887
1354955b
SH		 2888 return 0;
2889}
2890
2891static int clone_update_rootfs_wrapper(void *data)
2892{
2893 struct clone_update_data *arg = (struct clone_update_data *) data;
2894 return clone_update_rootfs(arg);
9be53773
SH		 2895}
2896
2897/*
2898 * We want to support:
2899sudo lxc-clone -o o1 -n n1 -s -L|-fssize fssize -v|--vgname vgname \
2900 -p|--lvprefix lvprefix -t|--fstype fstype -B backingstore
2901
2902-s [ implies overlayfs]
2903-s -B overlayfs
2904-s -B aufs
2905
2906only rootfs gets converted (copied/snapshotted) on clone.
2907*/
2908
d5752559 2909static int create_file_dirname(char *path, struct lxc_conf *conf)
9be53773 2910{
c32981c3 2911 char *p = strrchr(path, '/');
d5752559 2912 int ret = -1;
9be53773
SH		 2913
2914 if (!p)
2915 return -1;
2916 *p = '\0';
d5752559 2917 ret = do_create_container_dir(path, conf);
9be53773
SH		 2918 *p = '/';
2919 return ret;
2920}
2921
858377e4 2922static struct lxc_container *do_lxcapi_clone(struct lxc_container *c, const char *newname,
9be53773 2923 const char *lxcpath, int flags,
d659597e 2924 const char *bdevtype, const char *bdevdata, uint64_t newsize,
148e91f5 2925 char **hookargs)
9be53773
SH		 2926{
2927 struct lxc_container *c2 = NULL;
2928 char newpath[MAXPATHLEN];
176d9acb 2929 int ret, storage_copied = 0;
8d2efe40 2930 char *origroot = NULL;
1354955b 2931 struct clone_update_data data;
9be53773 2932 FILE *fout;
1354955b 2933 pid_t pid;
9be53773 2934
858377e4 2935 if (!c || !do_lxcapi_is_defined(c))
9be53773
SH		 2936 return NULL;
2937
5cee8c50 2938 if (container_mem_lock(c))
9be53773
SH		 2939 return NULL;
2940
39dc698c 2941 if (!is_stopped(c)) {
9be53773
SH		 2942 ERROR("error: Original container (%s) is running", c->name);
2943 goto out;
2944 }
2945
2946 // Make sure the container doesn't yet exist.
05d53f4c
SH		 2947 if (!newname)
2948 newname = c->name;
2949 if (!lxcpath)
858377e4 2950 lxcpath = do_lxcapi_get_config_path(c);
05d53f4c 2951 ret = snprintf(newpath, MAXPATHLEN, "%s/%s/config", lxcpath, newname);
6849cb5b 2952 if (ret < 0 || ret >= MAXPATHLEN) {
9be53773
SH		 2953 SYSERROR("clone: failed making config pathname");
2954 goto out;
2955 }
2956 if (file_exists(newpath)) {
2957 ERROR("error: clone: %s exists", newpath);
2958 goto out;
2959 }
2960
d5752559 2961 ret = create_file_dirname(newpath, c->lxc_conf);
96532523 2962 if (ret < 0 && errno != EEXIST) {
9be53773
SH		 2963 ERROR("Error creating container dir for %s", newpath);
2964 goto out;
2965 }
2966
2967 // copy the configuration, tweak it as needed,
8d2efe40
SH		 2968 if (c->lxc_conf->rootfs.path) {
2969 origroot = c->lxc_conf->rootfs.path;
2970 c->lxc_conf->rootfs.path = NULL;
2971 }
9be53773
SH		 2972 fout = fopen(newpath, "w");
2973 if (!fout) {
2974 SYSERROR("open %s", newpath);
2975 goto out;
2976 }
6b0d5538 2977 write_config(fout, c->lxc_conf);
9be53773 2978 fclose(fout);
8d2efe40 2979 c->lxc_conf->rootfs.path = origroot;
9be53773 2980
05d53f4c 2981 sprintf(newpath, "%s/%s/rootfs", lxcpath, newname);
9be53773
SH		 2982 if (mkdir(newpath, 0755) < 0) {
2983 SYSERROR("error creating %s", newpath);
2984 goto out;
2985 }
2986
1354955b
SH		 2987 if (am_unpriv()) {
2988 if (chown_mapped_root(newpath, c->lxc_conf) < 0) {
959aee9c 2989 ERROR("Error chowning %s to container root", newpath);
1354955b
SH		 2990 goto out;
2991 }
2992 }
2993
05d53f4c 2994 c2 = lxc_container_new(newname, lxcpath);
375c2258 2995 if (!c2) {
05d53f4c
SH		 2996 ERROR("clone: failed to create new container (%s %s)", newname,
2997 lxcpath);
9be53773
SH		 2998 goto out;
2999 }
8d2efe40
SH		 3000
3001 // copy/snapshot rootfs's
3002 ret = copy_storage(c, c2, bdevtype, flags, bdevdata, newsize);
3003 if (ret < 0)
3004 goto out;
9be53773 3005
6b0d5538 3006
96532523 3007 // update utsname
3d7ad474
CB		 3008 if (!(flags & LXC_CLONE_KEEPNAME)) {
3009 clear_unexp_config_line(c2->lxc_conf, "lxc.utsname", false);
3010
3011 if (!set_config_item_locked(c2, "lxc.utsname", newname)) {
3012 ERROR("Error setting new hostname");
3013 goto out;
3014 }
96532523
SH		 3015 }
3016
619256b5
ÇO		 3017 // copy hooks
3018 ret = copyhooks(c, c2);
3019 if (ret < 0) {
3020 ERROR("error copying hooks");
3021 goto out;
9be53773
SH		 3022 }
3023
3024 if (copy_fstab(c, c2) < 0) {
3025 ERROR("error copying fstab");
9be53773
SH		 3026 goto out;
3027 }
3028
3029 // update macaddrs
6b0d5538 3030 if (!(flags & LXC_CLONE_KEEPMACADDR)) {
67702c21
SH		 3031 if (!network_new_hwaddrs(c2->lxc_conf)) {
3032 ERROR("Error updating mac addresses");
6b0d5538
SH		 3033 goto out;
3034 }
3035 }
9be53773 3036
176d9acb
SH		 3037 // We've now successfully created c2's storage, so clear it out if we
3038 // fail after this
3039 storage_copied = 1;
3040
375c2258 3041 if (!c2->save_config(c2, NULL))
9be53773 3042 goto out;
9be53773 3043
1354955b
SH		 3044 if ((pid = fork()) < 0) {
3045 SYSERROR("fork");
9be53773 3046 goto out;
1354955b
SH		 3047 }
3048 if (pid > 0) {
3049 ret = wait_for_pid(pid);
3050 if (ret)
3051 goto out;
3052 container_mem_unlock(c);
3053 return c2;
3054 }
3055 data.c0 = c;
3056 data.c1 = c2;
3057 data.flags = flags;
3058 data.hookargs = hookargs;
3059 if (am_unpriv())
3060 ret = userns_exec_1(c->lxc_conf, clone_update_rootfs_wrapper,
3061 &data);
3062 else
3063 ret = clone_update_rootfs(&data);
3064 if (ret < 0)
3065 exit(1);
9be53773 3066
5cee8c50 3067 container_mem_unlock(c);
1354955b 3068 exit(0);
9be53773
SH		 3069
3070out:
5cee8c50 3071 container_mem_unlock(c);
375c2258 3072 if (c2) {
176d9acb
SH		 3073 if (!storage_copied)
3074 c2->lxc_conf->rootfs.path = NULL;
375c2258 3075 c2->destroy(c2);
9be53773 3076 lxc_container_put(c2);
375c2258 3077 }
9be53773
SH		 3078
3079 return NULL;
3080}
3081
858377e4
SH		 3082static struct lxc_container *lxcapi_clone(struct lxc_container *c, const char *newname,
3083 const char *lxcpath, int flags,
3084 const char *bdevtype, const char *bdevdata, uint64_t newsize,
3085 char **hookargs)
3086{
3087 struct lxc_container * ret;
3088 current_config = c ? c->lxc_conf : NULL;
3089 ret = do_lxcapi_clone(c, newname, lxcpath, flags, bdevtype, bdevdata, newsize, hookargs);
3090 current_config = NULL;
3091 return ret;
3092}
3093
3094static bool do_lxcapi_rename(struct lxc_container *c, const char *newname)
06e5650e
ÇO		 3095{
3096 struct bdev *bdev;
3097 struct lxc_container *newc;
06e5650e 3098
d693cf93 3099 if (!c || !c->name || !c->config_path || !c->lxc_conf)
06e5650e
ÇO		 3100 return false;
3101
18aa217b
SH		 3102 if (has_fs_snapshots(c) || has_snapshots(c)) {
3103 ERROR("Renaming a container with snapshots is not supported");
3104 return false;
3105 }
76a26f55 3106 bdev = bdev_init(c->lxc_conf, c->lxc_conf->rootfs.path, c->lxc_conf->rootfs.mount, NULL);
06e5650e
ÇO		 3107 if (!bdev) {
3108 ERROR("Failed to find original backing store type");
3109 return false;
3110 }
3111
619256b5 3112 newc = lxcapi_clone(c, newname, c->config_path, LXC_CLONE_KEEPMACADDR, NULL, bdev->type, 0, NULL);
06e5650e
ÇO		 3113 bdev_put(bdev);
3114 if (!newc) {
3115 lxc_container_put(newc);
3116 return false;
3117 }
3118
3119 if (newc && lxcapi_is_defined(newc))
3120 lxc_container_put(newc);
3121
18aa217b 3122 if (!container_destroy(c)) {
06e5650e
ÇO		 3123 ERROR("Could not destroy existing container %s", c->name);
3124 return false;
3125 }
3126 return true;
3127}
3128
858377e4
SH		 3129WRAP_API_1(bool, lxcapi_rename, const char *)
3130
a0e93eeb
CS		 3131static 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)
3132{
858377e4
SH		 3133 int ret;
3134
a0e93eeb
CS		 3135 if (!c)
3136 return -1;
3137
858377e4
SH		 3138 current_config = c->lxc_conf;
3139
3140 ret = lxc_attach(c->name, c->config_path, exec_function, exec_payload, options, attached_process);
3141 current_config = NULL;
3142 return ret;
a0e93eeb
CS		 3143}
3144
858377e4 3145static int do_lxcapi_attach_run_wait(struct lxc_container *c, lxc_attach_options_t *options, const char *program, const char * const argv[])
a0e93eeb
CS		 3146{
3147 lxc_attach_command_t command;
3148 pid_t pid;
3149 int r;
3150
3151 if (!c)
3152 return -1;
3153
3154 command.program = (char*)program;
3155 command.argv = (char**)argv;
3156 r = lxc_attach(c->name, c->config_path, lxc_attach_run_command, &command, options, &pid);
3157 if (r < 0) {
3158 ERROR("ups");
3159 return r;
3160 }
3161 return lxc_wait_for_pid_status(pid);
3162}
3163
858377e4
SH		 3164static int lxcapi_attach_run_wait(struct lxc_container *c, lxc_attach_options_t *options, const char *program, const char * const argv[])
3165{
3166 int ret;
3167 current_config = c ? c->lxc_conf : NULL;
3168 ret = do_lxcapi_attach_run_wait(c, options, program, argv);
3169 current_config = NULL;
3170 return ret;
3171}
3172
74a3920a 3173static int get_next_index(const char *lxcpath, char *cname)
f5dd1d53
SH		 3174{
3175 char *fname;
3176 struct stat sb;
3177 int i = 0, ret;
3178
3179 fname = alloca(strlen(lxcpath) + 20);
3180 while (1) {
3181 sprintf(fname, "%s/snap%d", lxcpath, i);
3182 ret = stat(fname, &sb);
3183 if (ret != 0)
3184 return i;
3185 i++;
3186 }
3187}
3188
18aa217b
SH		 3189static bool get_snappath_dir(struct lxc_container *c, char *snappath)
3190{
3191 int ret;
3192 /*
3193 * If the old style snapshot path exists, use it
3194 * /var/lib/lxc -> /var/lib/lxcsnaps
3195 */
3196 ret = snprintf(snappath, MAXPATHLEN, "%ssnaps", c->config_path);
3197 if (ret < 0 || ret >= MAXPATHLEN)
3198 return false;
3199 if (dir_exists(snappath)) {
3200 ret = snprintf(snappath, MAXPATHLEN, "%ssnaps/%s", c->config_path, c->name);
3201 if (ret < 0 || ret >= MAXPATHLEN)
3202 return false;
3203 return true;
3204 }
3205
3206 /*
3207 * Use the new style path
3208 * /var/lib/lxc -> /var/lib/lxc + c->name + /snaps + \0
3209 */
3210 ret = snprintf(snappath, MAXPATHLEN, "%s/%s/snaps", c->config_path, c->name);
3211 if (ret < 0 || ret >= MAXPATHLEN)
3212 return false;
3213 return true;
3214}
3215
858377e4 3216static int do_lxcapi_snapshot(struct lxc_container *c, const char *commentfile)
f5dd1d53
SH		 3217{
3218 int i, flags, ret;
3219 struct lxc_container *c2;
3220 char snappath[MAXPATHLEN], newname[20];
3221
840f05df
SH		 3222 if (!c || !lxcapi_is_defined(c))
3223 return -1;
3224
cdd01be2
SH		 3225 if (!bdev_can_backup(c->lxc_conf)) {
3226 ERROR("%s's backing store cannot be backed up.", c->name);
3227 ERROR("Your container must use another backing store type.");
3228 return -1;
3229 }
3230
18aa217b 3231 if (!get_snappath_dir(c, snappath))
f5dd1d53 3232 return -1;
18aa217b 3233
f5dd1d53
SH		 3234 i = get_next_index(snappath, c->name);
3235
3236 if (mkdir_p(snappath, 0755) < 0) {
3237 ERROR("Failed to create snapshot directory %s", snappath);
3238 return -1;
3239 }
3240
3241 ret = snprintf(newname, 20, "snap%d", i);
3242 if (ret < 0 || ret >= 20)
3243 return -1;
3244
0a83cbbb
SH		 3245 /*
3246 * We pass LXC_CLONE_SNAPSHOT to make sure that a rdepends file entry is
3247 * created in the original container
3248 */
3249 flags = LXC_CLONE_SNAPSHOT | LXC_CLONE_KEEPMACADDR | LXC_CLONE_KEEPNAME |
3250 LXC_CLONE_KEEPBDEVTYPE | LXC_CLONE_MAYBE_SNAPSHOT;
76a26f55 3251 if (bdev_is_dir(c->lxc_conf, c->lxc_conf->rootfs.path)) {
8c39f7a4
SH		 3252 ERROR("Snapshot of directory-backed container requested.");
3253 ERROR("Making a copy-clone. If you do want snapshots, then");
1f92162d 3254 ERROR("please create an aufs or overlayfs clone first, snapshot that");
8c39f7a4
SH		 3255 ERROR("and keep the original container pristine.");
3256 flags &= ~LXC_CLONE_SNAPSHOT | LXC_CLONE_MAYBE_SNAPSHOT;
3257 }
858377e4 3258 c2 = do_lxcapi_clone(c, newname, snappath, flags, NULL, NULL, 0, NULL);
f5dd1d53 3259 if (!c2) {
959aee9c 3260 ERROR("clone of %s:%s failed", c->config_path, c->name);
f5dd1d53
SH		 3261 return -1;
3262 }
3263
3264 lxc_container_put(c2);
3265
3266 // Now write down the creation time
3267 time_t timer;
3268 char buffer[25];
3269 struct tm* tm_info;
025ed0f3 3270 FILE *f;
f5dd1d53
SH		 3271
3272 time(&timer);
3273 tm_info = localtime(&timer);
3274
3275 strftime(buffer, 25, "%Y:%m:%d %H:%M:%S", tm_info);
3276
3277 char *dfnam = alloca(strlen(snappath) + strlen(newname) + 5);
3278 sprintf(dfnam, "%s/%s/ts", snappath, newname);
025ed0f3 3279 f = fopen(dfnam, "w");
f5dd1d53 3280 if (!f) {
959aee9c 3281 ERROR("Failed to open %s", dfnam);
f5dd1d53
SH		 3282 return -1;
3283 }
3284 if (fprintf(f, "%s", buffer) < 0) {
3285 SYSERROR("Writing timestamp");
3286 fclose(f);
3287 return -1;
3288 }
025ed0f3 3289 ret = fclose(f);
025ed0f3 3290 if (ret != 0) {
f5dd1d53
SH		 3291 SYSERROR("Writing timestamp");
3292 return -1;
3293 }
3294
3295 if (commentfile) {
3296 // $p / $name / comment \0
3297 int len = strlen(snappath) + strlen(newname) + 10;
3298 char *path = alloca(len);
3299 sprintf(path, "%s/%s/comment", snappath, newname);
3300 return copy_file(commentfile, path) < 0 ? -1 : i;
3301 }
3302
3303 return i;
3304}
3305
858377e4
SH		 3306WRAP_API_1(int, lxcapi_snapshot, const char *)
3307
f5dd1d53
SH		 3308static void lxcsnap_free(struct lxc_snapshot *s)
3309{
f10fad2f
ME		 3310 free(s->name);
3311 free(s->comment_pathname);
3312 free(s->timestamp);
3313 free(s->lxcpath);
f5dd1d53
SH		 3314}
3315
3316static char *get_snapcomment_path(char* snappath, char *name)
3317{
3318 // $snappath/$name/comment
3319 int ret, len = strlen(snappath) + strlen(name) + 10;
3320 char *s = malloc(len);
3321
3322 if (s) {
3323 ret = snprintf(s, len, "%s/%s/comment", snappath, name);
3324 if (ret < 0 || ret >= len) {
3325 free(s);
3326 s = NULL;
3327 }
3328 }
3329 return s;
3330}
3331
3332static char *get_timestamp(char* snappath, char *name)
3333{
3334 char path[MAXPATHLEN], *s = NULL;
3335 int ret, len;
3336 FILE *fin;
3337
3338 ret = snprintf(path, MAXPATHLEN, "%s/%s/ts", snappath, name);
3339 if (ret < 0 || ret >= MAXPATHLEN)
3340 return NULL;
025ed0f3 3341 fin = fopen(path, "r");
025ed0f3 3342 if (!fin)
f5dd1d53
SH		 3343 return NULL;
3344 (void) fseek(fin, 0, SEEK_END);
3345 len = ftell(fin);
3346 (void) fseek(fin, 0, SEEK_SET);
3347 if (len > 0) {
3348 s = malloc(len+1);
3349 if (s) {
3350 s[len] = '\0';
3351 if (fread(s, 1, len, fin) != len) {
3352 SYSERROR("reading timestamp");
3353 free(s);
3354 s = NULL;
3355 }
3356 }
3357 }
3358 fclose(fin);
3359 return s;
3360}
3361
858377e4 3362static int do_lxcapi_snapshot_list(struct lxc_container *c, struct lxc_snapshot **ret_snaps)
f5dd1d53
SH		 3363{
3364 char snappath[MAXPATHLEN], path2[MAXPATHLEN];
18aa217b 3365 int count = 0, ret;
f5dd1d53
SH		 3366 struct dirent dirent, *direntp;
3367 struct lxc_snapshot *snaps =NULL, *nsnaps;
3368 DIR *dir;
3369
3370 if (!c || !lxcapi_is_defined(c))
3371 return -1;
c868b261 3372
18aa217b 3373 if (!get_snappath_dir(c, snappath)) {
f5dd1d53
SH		 3374 ERROR("path name too long");
3375 return -1;
3376 }
025ed0f3 3377 dir = opendir(snappath);
025ed0f3 3378 if (!dir) {
f5dd1d53
SH		 3379 INFO("failed to open %s - assuming no snapshots", snappath);
3380 return 0;
3381 }
3382
3383 while (!readdir_r(dir, &dirent, &direntp)) {
3384 if (!direntp)
3385 break;
3386
3387 if (!strcmp(direntp->d_name, "."))
3388 continue;
3389
3390 if (!strcmp(direntp->d_name, ".."))
3391 continue;
3392
3393 ret = snprintf(path2, MAXPATHLEN, "%s/%s/config", snappath, direntp->d_name);
3394 if (ret < 0 || ret >= MAXPATHLEN) {
3395 ERROR("pathname too long");
3396 goto out_free;
3397 }
3398 if (!file_exists(path2))
3399 continue;
3400 nsnaps = realloc(snaps, (count + 1)*sizeof(*snaps));
3401 if (!nsnaps) {
3402 SYSERROR("Out of memory");
3403 goto out_free;
3404 }
3405 snaps = nsnaps;
3406 snaps[count].free = lxcsnap_free;
3407 snaps[count].name = strdup(direntp->d_name);
3408 if (!snaps[count].name)
3409 goto out_free;
3410 snaps[count].lxcpath = strdup(snappath);
3411 if (!snaps[count].lxcpath) {
3412 free(snaps[count].name);
3413 goto out_free;
3414 }
3415 snaps[count].comment_pathname = get_snapcomment_path(snappath, direntp->d_name);
3416 snaps[count].timestamp = get_timestamp(snappath, direntp->d_name);
3417 count++;
3418 }
3419
3420 if (closedir(dir))
3421 WARN("failed to close directory");
3422
3423 *ret_snaps = snaps;
3424 return count;
3425
3426out_free:
3427 if (snaps) {
3428 int i;
3429 for (i=0; i<count; i++)
3430 lxcsnap_free(&snaps[i]);
3431 free(snaps);
3432 }
9baa57bd
SH		 3433 if (closedir(dir))
3434 WARN("failed to close directory");
f5dd1d53
SH		 3435 return -1;
3436}
3437
858377e4
SH		 3438WRAP_API_1(int, lxcapi_snapshot_list, struct lxc_snapshot **)
3439
3440static bool do_lxcapi_snapshot_restore(struct lxc_container *c, const char *snapname, const char *newname)
f5dd1d53
SH		 3441{
3442 char clonelxcpath[MAXPATHLEN];
18aa217b 3443 int flags = 0;
f5dd1d53
SH		 3444 struct lxc_container *snap, *rest;
3445 struct bdev *bdev;
3446 bool b = false;
3447
3448 if (!c || !c->name || !c->config_path)
3449 return false;
3450
18aa217b
SH		 3451 if (has_fs_snapshots(c)) {
3452 ERROR("container rootfs has dependent snapshots");
3453 return false;
3454 }
3455
76a26f55 3456 bdev = bdev_init(c->lxc_conf, c->lxc_conf->rootfs.path, c->lxc_conf->rootfs.mount, NULL);
f5dd1d53
SH		 3457 if (!bdev) {
3458 ERROR("Failed to find original backing store type");
3459 return false;
3460 }
3461
3462 if (!newname)
3463 newname = c->name;
7e36f87e 3464
18aa217b 3465 if (!get_snappath_dir(c, clonelxcpath)) {
f5dd1d53
SH		 3466 bdev_put(bdev);
3467 return false;
3468 }
3469 // how should we lock this?
3470
3471 snap = lxc_container_new(snapname, clonelxcpath);
3472 if (!snap || !lxcapi_is_defined(snap)) {
3473 ERROR("Could not open snapshot %s", snapname);
3474 if (snap) lxc_container_put(snap);
3475 bdev_put(bdev);
3476 return false;
3477 }
3478
7e36f87e 3479 if (strcmp(c->name, newname) == 0) {
18aa217b 3480 if (!container_destroy(c)) {
7e36f87e
ÇO		 3481 ERROR("Could not destroy existing container %s", newname);
3482 lxc_container_put(snap);
3483 bdev_put(bdev);
3484 return false;
3485 }
3486 }
3487
de269ee8
SH		 3488 if (strcmp(bdev->type, "dir") != 0 && strcmp(bdev->type, "loop") != 0)
3489 flags = LXC_CLONE_SNAPSHOT | LXC_CLONE_MAYBE_SNAPSHOT;
3490 rest = lxcapi_clone(snap, newname, c->config_path, flags,
3491 bdev->type, NULL, 0, NULL);
f5dd1d53
SH		 3492 bdev_put(bdev);
3493 if (rest && lxcapi_is_defined(rest))
3494 b = true;
3495 if (rest)
3496 lxc_container_put(rest);
3497 lxc_container_put(snap);
3498 return b;
3499}
3500
858377e4
SH		 3501WRAP_API_2(bool, lxcapi_snapshot_restore, const char *, const char *)
3502
18aa217b 3503static bool do_snapshot_destroy(const char *snapname, const char *clonelxcpath)
771d96b3 3504{
771d96b3 3505 struct lxc_container *snap = NULL;
18aa217b 3506 bool bret = false;
771d96b3
ÇO		 3507
3508 snap = lxc_container_new(snapname, clonelxcpath);
18aa217b 3509 if (!snap) {
771d96b3
ÇO		 3510 ERROR("Could not find snapshot %s", snapname);
3511 goto err;
3512 }
3513
858377e4 3514 if (!do_lxcapi_destroy(snap)) {
771d96b3
ÇO		 3515 ERROR("Could not destroy snapshot %s", snapname);
3516 goto err;
3517 }
18aa217b 3518 bret = true;
771d96b3 3519
771d96b3
ÇO		 3520err:
3521 if (snap)
3522 lxc_container_put(snap);
18aa217b
SH		 3523 return bret;
3524}
3525
3526static bool remove_all_snapshots(const char *path)
3527{
3528 DIR *dir;
3529 struct dirent dirent, *direntp;
3530 bool bret = true;
3531
3532 dir = opendir(path);
3533 if (!dir) {
3534 SYSERROR("opendir on snapshot path %s", path);
3535 return false;
3536 }
3537 while (!readdir_r(dir, &dirent, &direntp)) {
3538 if (!direntp)
3539 break;
3540 if (!strcmp(direntp->d_name, "."))
3541 continue;
3542 if (!strcmp(direntp->d_name, ".."))
3543 continue;
3544 if (!do_snapshot_destroy(direntp->d_name, path)) {
3545 bret = false;
3546 continue;
3547 }
3548 }
3549
3550 closedir(dir);
3551
3552 if (rmdir(path))
3553 SYSERROR("Error removing directory %s", path);
3554
3555 return bret;
3556}
3557
858377e4 3558static bool do_lxcapi_snapshot_destroy(struct lxc_container *c, const char *snapname)
18aa217b
SH		 3559{
3560 char clonelxcpath[MAXPATHLEN];
3561
3562 if (!c || !c->name || !c->config_path || !snapname)
3563 return false;
3564
3565 if (!get_snappath_dir(c, clonelxcpath))
3566 return false;
3567
3568 return do_snapshot_destroy(snapname, clonelxcpath);
3569}
3570
858377e4
SH		 3571WRAP_API_1(bool, lxcapi_snapshot_destroy, const char *)
3572
3573static bool do_lxcapi_snapshot_destroy_all(struct lxc_container *c)
18aa217b
SH		 3574{
3575 char clonelxcpath[MAXPATHLEN];
3576
3577 if (!c || !c->name || !c->config_path)
3578 return false;
3579
3580 if (!get_snappath_dir(c, clonelxcpath))
3581 return false;
3582
3583 return remove_all_snapshots(clonelxcpath);
771d96b3
ÇO		 3584}
3585
858377e4
SH		 3586WRAP_API(bool, lxcapi_snapshot_destroy_all)
3587
3588static bool do_lxcapi_may_control(struct lxc_container *c)
b494d2dd
SH		 3589{
3590 return lxc_try_cmd(c->name, c->config_path) == 0;
3591}
3592
858377e4
SH		 3593WRAP_API(bool, lxcapi_may_control)
3594
d5aa23e6
SH		 3595static bool do_add_remove_node(pid_t init_pid, const char *path, bool add,
3596 struct stat *st)
3597{
3598 char chrootpath[MAXPATHLEN];
3599 char *directory_path = NULL;
3600 pid_t pid;
3601 int ret;
3602
3603 if ((pid = fork()) < 0) {
3604 SYSERROR("failed to fork a child helper");
3605 return false;
3606 }
3607 if (pid) {
3608 if (wait_for_pid(pid) != 0) {
3609 ERROR("Failed to create note in guest");
3610 return false;
3611 }
3612 return true;
3613 }
3614
3615 /* prepare the path */
3616 ret = snprintf(chrootpath, MAXPATHLEN, "/proc/%d/root", init_pid);
3617 if (ret < 0 || ret >= MAXPATHLEN)
3618 return false;
3619
6b9324bd 3620 if (chroot(chrootpath) < 0)
d5aa23e6 3621 exit(1);
6b9324bd 3622 if (chdir("/") < 0)
d5aa23e6
SH		 3623 exit(1);
3624 /* remove path if it exists */
3625 if(faccessat(AT_FDCWD, path, F_OK, AT_SYMLINK_NOFOLLOW) == 0) {
3626 if (unlink(path) < 0) {
3627 ERROR("unlink failed");
3628 exit(1);
3629 }
3630 }
3631 if (!add)
3632 exit(0);
3633
3634 /* create any missing directories */
3635 directory_path = dirname(strdup(path));
3636 if (mkdir_p(directory_path, 0755) < 0 && errno != EEXIST) {
3637 ERROR("failed to create directory");
3638 exit(1);
3639 }
3640
3641 /* create the device node */
3642 if (mknod(path, st->st_mode, st->st_rdev) < 0) {
3643 ERROR("mknod failed");
3644 exit(1);
3645 }
3646
3647 exit(0);
3648}
3649
f0ca2726 3650static bool add_remove_device_node(struct lxc_container *c, const char *src_path, const char *dest_path, bool add)
a9a0ed90
ÇO		 3651{
3652 int ret;
3653 struct stat st;
a9a0ed90 3654 char value[MAX_BUFFER];
f0ca2726 3655 const char *p;
a9a0ed90
ÇO		 3656
3657 /* make sure container is running */
858377e4 3658 if (!do_lxcapi_is_running(c)) {
a9a0ed90 3659 ERROR("container is not running");
d5aa23e6 3660 return false;
a9a0ed90
ÇO		 3661 }
3662
3663 /* use src_path if dest_path is NULL otherwise use dest_path */
3664 p = dest_path ? dest_path : src_path;
3665
a9a0ed90
ÇO		 3666 /* make sure we can access p */
3667 if(access(p, F_OK) < 0 || stat(p, &st) < 0)
d5aa23e6 3668 return false;
a9a0ed90
ÇO		 3669
3670 /* continue if path is character device or block device */
c6a9b0d7 3671 if (S_ISCHR(st.st_mode))
a9a0ed90 3672 ret = snprintf(value, MAX_BUFFER, "c %d:%d rwm", major(st.st_rdev), minor(st.st_rdev));
c6a9b0d7 3673 else if (S_ISBLK(st.st_mode))
a9a0ed90
ÇO		 3674 ret = snprintf(value, MAX_BUFFER, "b %d:%d rwm", major(st.st_rdev), minor(st.st_rdev));
3675 else
d5aa23e6 3676 return false;
a9a0ed90
ÇO		 3677
3678 /* check snprintf return code */
3679 if (ret < 0 || ret >= MAX_BUFFER)
d5aa23e6 3680 return false;
a9a0ed90 3681
858377e4 3682 if (!do_add_remove_node(do_lxcapi_init_pid(c), p, add, &st))
d5aa23e6 3683 return false;
a9a0ed90 3684
d5aa23e6 3685 /* add or remove device to/from cgroup access list */
a9a0ed90 3686 if (add) {
858377e4 3687 if (!do_lxcapi_set_cgroup_item(c, "devices.allow", value)) {
a9a0ed90 3688 ERROR("set_cgroup_item failed while adding the device node");
d5aa23e6 3689 return false;
a9a0ed90
ÇO		 3690 }
3691 } else {
858377e4 3692 if (!do_lxcapi_set_cgroup_item(c, "devices.deny", value)) {
a9a0ed90 3693 ERROR("set_cgroup_item failed while removing the device node");
d5aa23e6 3694 return false;
a9a0ed90
ÇO		 3695 }
3696 }
d5aa23e6 3697
a9a0ed90 3698 return true;
a9a0ed90
ÇO		 3699}
3700
858377e4 3701static bool do_lxcapi_add_device_node(struct lxc_container *c, const char *src_path, const char *dest_path)
a9a0ed90 3702{
c868b261
ÇO		 3703 if (am_unpriv()) {
3704 ERROR(NOT_SUPPORTED_ERROR, __FUNCTION__);
3705 return false;
3706 }
a9a0ed90
ÇO		 3707 return add_remove_device_node(c, src_path, dest_path, true);
3708}
3709
858377e4
SH		 3710WRAP_API_2(bool, lxcapi_add_device_node, const char *, const char *)
3711
3712static bool do_lxcapi_remove_device_node(struct lxc_container *c, const char *src_path, const char *dest_path)
a9a0ed90 3713{
c868b261
ÇO		 3714 if (am_unpriv()) {
3715 ERROR(NOT_SUPPORTED_ERROR, __FUNCTION__);
3716 return false;
3717 }
a9a0ed90
ÇO		 3718 return add_remove_device_node(c, src_path, dest_path, false);
3719}
3720
858377e4
SH		 3721WRAP_API_2(bool, lxcapi_remove_device_node, const char *, const char *)
3722
3723static bool do_lxcapi_attach_interface(struct lxc_container *c, const char *ifname,
e58fae8f
DY		 3724 const char *dst_ifname)
3725{
3726 int ret = 0;
3727 if (am_unpriv()) {
3728 ERROR(NOT_SUPPORTED_ERROR, __FUNCTION__);
3729 return false;
3730 }
3731
3732 if (!ifname) {
3733 ERROR("No source interface name given");
3734 return false;
3735 }
3736
3737 ret = lxc_netdev_isup(ifname);
e58fae8f 3738
e5848d39
SH		 3739 if (ret > 0) {
3740 /* netdev of ifname is up. */
e58fae8f
DY		 3741 ret = lxc_netdev_down(ifname);
3742 if (ret)
3743 goto err;
3744 }
3745
858377e4 3746 ret = lxc_netdev_move_by_name(ifname, do_lxcapi_init_pid(c), dst_ifname);
e58fae8f
DY		 3747 if (ret)
3748 goto err;
3749
3750 return true;
e5848d39 3751
e58fae8f 3752err:
e58fae8f
DY		 3753 return false;
3754}
3755
858377e4
SH		 3756WRAP_API_2(bool, lxcapi_attach_interface, const char *, const char *)
3757
3758static bool do_lxcapi_detach_interface(struct lxc_container *c, const char *ifname,
e58fae8f
DY		 3759 const char *dst_ifname)
3760{
3761 pid_t pid, pid_outside;
3762
3763 if (am_unpriv()) {
3764 ERROR(NOT_SUPPORTED_ERROR, __FUNCTION__);
3765 return false;
3766 }
3767
3768 if (!ifname) {
3769 ERROR("No source interface name given");
3770 return false;
3771 }
3772
3773 pid_outside = getpid();
3774 pid = fork();
3775 if (pid < 0) {
3776 ERROR("failed to fork task to get interfaces information");
3777 return false;
3778 }
3779
3780 if (pid == 0) { // child
3781 int ret = 0;
e0f59189 3782 if (!enter_net_ns(c)) {
e58fae8f
DY		 3783 ERROR("failed to enter namespace");
3784 exit(-1);
3785 }
3786
3787 ret = lxc_netdev_isup(ifname);
3788 if (ret < 0)
3789 exit(ret);
3790
3791 /* netdev of ifname is up. */
3792 if (ret) {
3793 ret = lxc_netdev_down(ifname);
3794 if (ret)
3795 exit(ret);
3796 }
3797
3798 ret = lxc_netdev_move_by_name(ifname, pid_outside, dst_ifname);
3799
3800 /* -EINVAL means there is no netdev named as ifanme. */
3801 if (ret == -EINVAL) {
3802 ERROR("No network device named as %s.", ifname);
3803 }
3804 exit(ret);
3805 }
3806
3807 if (wait_for_pid(pid) != 0)
3808 return false;
3809
3810 return true;
3811}
3812
858377e4
SH		 3813WRAP_API_2(bool, lxcapi_detach_interface, const char *, const char *)
3814
3815static bool do_lxcapi_checkpoint(struct lxc_container *c, char *directory, bool stop, bool verbose)
bbd4e13e
TA		 3816{
3817 pid_t pid;
3818 int status;
85c50991 3819 char path[PATH_MAX];
bbd4e13e
TA		 3820
3821 if (!criu_ok(c))
3822 return false;
3823
3824 if (mkdir(directory, 0700) < 0 && errno != EEXIST)
3825 return false;
3826
85c50991
TA		 3827 status = snprintf(path, sizeof(path), "%s/inventory.img", directory);
3828 if (status < 0 || status >= sizeof(path))
3829 return false;
3830
3831 if (access(path, F_OK) == 0) {
3832 ERROR("please use a fresh directory for the dump directory\n");
3833 return false;
3834 }
3835
735f2c6e
TA		 3836 pid = fork();
3837 if (pid < 0)
3838 return false;
3839
3840 if (pid == 0) {
3841 struct criu_opts os;
3842
3843 os.action = "dump";
3844 os.directory = directory;
3845 os.c = c;
3846 os.stop = stop;
3847 os.verbose = verbose;
3848
3849 /* exec_criu() returning is an error */
3850 exec_criu(&os);
3851 exit(1);
3852 } else {
3853 pid_t w = waitpid(pid, &status, 0);
3854 if (w == -1) {
3fdf4a73 3855 SYSERROR("waitpid");
735f2c6e
TA		 3856 return false;
3857 }
3858
3859 if (WIFEXITED(status)) {
3860 return !WEXITSTATUS(status);
3861 }
3862
3863 return false;
3864 }
3865}
3866
858377e4
SH		 3867WRAP_API_3(bool, lxcapi_checkpoint, char *, bool, bool)
3868
3869static bool do_lxcapi_restore(struct lxc_container *c, char *directory, bool verbose)
c9d8f2ee
TA		 3870{
3871 pid_t pid;
3872 int status, nread;
3873 int pipefd[2];
3874
3875 if (!criu_ok(c))
3876 return false;
3877
3878 if (geteuid()) {
3879 ERROR("Must be root to restore\n");
3880 return false;
3881 }
3882
3883 if (pipe(pipefd)) {
3884 ERROR("failed to create pipe");
3885 return false;
3886 }
3887
3888 pid = fork();
3889 if (pid < 0) {
3890 close(pipefd[0]);
3891 close(pipefd[1]);
3892 return false;
3893 }
3894
3895 if (pid == 0) {
3896 close(pipefd[0]);
3897 // this never returns
3898 do_restore(c, pipefd[1], directory, verbose);
3899 }
3900
3901 close(pipefd[1]);
3902
3903 nread = read(pipefd[0], &status, sizeof(status));
3904 close(pipefd[0]);
3905 if (sizeof(status) != nread) {
3906 ERROR("reading status from pipe failed");
3907 goto err_wait;
3908 }
3909
3910 // If the criu process was killed or exited nonzero, wait() for the
3911 // handler, since the restore process died. Otherwise, we don't need to
3912 // wait, since the child becomes the monitor process.
3913 if (!WIFEXITED(status) || WEXITSTATUS(status))
3914 goto err_wait;
3915 return true;
3916
3917err_wait:
3918 if (wait_for_pid(pid))
3919 ERROR("restore process died");
3920 return false;
735f2c6e
TA		 3921}
3922
858377e4
SH		 3923WRAP_API_2(bool, lxcapi_restore, char *, bool)
3924
a0e93eeb
CS		 3925static int lxcapi_attach_run_waitl(struct lxc_container *c, lxc_attach_options_t *options, const char *program, const char *arg, ...)
3926{
3927 va_list ap;
3928 const char **argv;
3929 int ret;
3930
3931 if (!c)
3932 return -1;
3933
858377e4
SH		 3934 current_config = c->lxc_conf;
3935
a0e93eeb
CS		 3936 va_start(ap, arg);
3937 argv = lxc_va_arg_list_to_argv_const(ap, 1);
3938 va_end(ap);
3939
3940 if (!argv) {
3941 ERROR("Memory allocation error.");
858377e4
SH		 3942 ret = -1;
3943 goto out;
a0e93eeb
CS		 3944 }
3945 argv[0] = arg;
3946
858377e4 3947 ret = do_lxcapi_attach_run_wait(c, options, program, (const char * const *)argv);
a0e93eeb 3948 free((void*)argv);
858377e4
SH		 3949out:
3950 current_config = NULL;
a0e93eeb
CS		 3951 return ret;
3952}
3953
afeecbba 3954struct lxc_container *lxc_container_new(const char *name, const char *configpath)
72d0e1cb
SG		 3955{
3956 struct lxc_container *c;
72d0e1cb 3957
18aa217b
SH		 3958 if (!name)
3959 return NULL;
3960
72d0e1cb
SG		 3961 c = malloc(sizeof(*c));
3962 if (!c) {
3963 fprintf(stderr, "failed to malloc lxc_container\n");
3964 return NULL;
3965 }
3966 memset(c, 0, sizeof(*c));
3967
afeecbba
SH		 3968 if (configpath)
3969 c->config_path = strdup(configpath);
3970 else
593e8478 3971 c->config_path = strdup(lxc_global_config_value("lxc.lxcpath"));
afeecbba 3972
2a59a681 3973 if (!c->config_path) {
03fadd16 3974 fprintf(stderr, "Out of memory\n");
2a59a681
SH		 3975 goto err;
3976 }
3977
f5dd1d53 3978 remove_trailing_slashes(c->config_path);
72d0e1cb
SG		 3979 c->name = malloc(strlen(name)+1);
3980 if (!c->name) {
3981 fprintf(stderr, "Error allocating lxc_container name\n");
3982 goto err;
3983 }
3984 strcpy(c->name, name);
3985
3986 c->numthreads = 1;
df271a59 3987 if (!(c->slock = lxc_newlock(c->config_path, name))) {
72d0e1cb
SG		 3988 fprintf(stderr, "failed to create lock\n");
3989 goto err;
3990 }
3991
df271a59 3992 if (!(c->privlock = lxc_newlock(NULL, NULL))) {
72d0e1cb
SG		 3993 fprintf(stderr, "failed to alloc privlock\n");
3994 goto err;
3995 }
3996
afeecbba 3997 if (!set_config_filename(c)) {
72d0e1cb
SG		 3998 fprintf(stderr, "Error allocating config file pathname\n");
3999 goto err;
4000 }
72d0e1cb 4001
bac806d1
SH		 4002 if (file_exists(c->configfile) && !lxcapi_load_config(c, NULL))
4003 goto err;
72d0e1cb 4004
3e625e2d
SH		 4005 if (ongoing_create(c) == 2) {
4006 ERROR("Error: %s creation was not completed", c->name);
18aa217b 4007 container_destroy(c);
4df7f012 4008 lxcapi_clear_config(c);
3e625e2d 4009 }
a2739df5 4010 c->daemonize = true;
72cf75fa 4011 c->pidfile = NULL;
3e625e2d 4012
72d0e1cb
SG		 4013 // assign the member functions
4014 c->is_defined = lxcapi_is_defined;
4015 c->state = lxcapi_state;
4016 c->is_running = lxcapi_is_running;
4017 c->freeze = lxcapi_freeze;
4018 c->unfreeze = lxcapi_unfreeze;
0115f8fd 4019 c->console = lxcapi_console;
b5159817 4020 c->console_getfd = lxcapi_console_getfd;
72d0e1cb
SG		 4021 c->init_pid = lxcapi_init_pid;
4022 c->load_config = lxcapi_load_config;
4023 c->want_daemonize = lxcapi_want_daemonize;
130a1888 4024 c->want_close_all_fds = lxcapi_want_close_all_fds;
72d0e1cb
SG		 4025 c->start = lxcapi_start;
4026 c->startl = lxcapi_startl;
4027 c->stop = lxcapi_stop;
4028 c->config_file_name = lxcapi_config_file_name;
4029 c->wait = lxcapi_wait;
4030 c->set_config_item = lxcapi_set_config_item;
4031 c->destroy = lxcapi_destroy;
18aa217b 4032 c->destroy_with_snapshots = lxcapi_destroy_with_snapshots;
06e5650e 4033 c->rename = lxcapi_rename;
72d0e1cb
SG		 4034 c->save_config = lxcapi_save_config;
4035 c->get_keys = lxcapi_get_keys;
4036 c->create = lxcapi_create;
4037 c->createl = lxcapi_createl;
4038 c->shutdown = lxcapi_shutdown;
3e625e2d 4039 c->reboot = lxcapi_reboot;
4df7f012 4040 c->clear_config = lxcapi_clear_config;
72d0e1cb
SG		 4041 c->clear_config_item = lxcapi_clear_config_item;
4042 c->get_config_item = lxcapi_get_config_item;
8ac18377 4043 c->get_running_config_item = lxcapi_get_running_config_item;
794dd120
SH		 4044 c->get_cgroup_item = lxcapi_get_cgroup_item;
4045 c->set_cgroup_item = lxcapi_set_cgroup_item;
2a59a681
SH		 4046 c->get_config_path = lxcapi_get_config_path;
4047 c->set_config_path = lxcapi_set_config_path;
9be53773 4048 c->clone = lxcapi_clone;
799f29ab 4049 c->get_interfaces = lxcapi_get_interfaces;
9c83a661 4050 c->get_ips = lxcapi_get_ips;
a0e93eeb
CS		 4051 c->attach = lxcapi_attach;
4052 c->attach_run_wait = lxcapi_attach_run_wait;
4053 c->attach_run_waitl = lxcapi_attach_run_waitl;
f5dd1d53
SH		 4054 c->snapshot = lxcapi_snapshot;
4055 c->snapshot_list = lxcapi_snapshot_list;
4056 c->snapshot_restore = lxcapi_snapshot_restore;
771d96b3 4057 c->snapshot_destroy = lxcapi_snapshot_destroy;
18aa217b 4058 c->snapshot_destroy_all = lxcapi_snapshot_destroy_all;
b494d2dd 4059 c->may_control = lxcapi_may_control;
a9a0ed90
ÇO		 4060 c->add_device_node = lxcapi_add_device_node;
4061 c->remove_device_node = lxcapi_remove_device_node;
e58fae8f
DY		 4062 c->attach_interface = lxcapi_attach_interface;
4063 c->detach_interface = lxcapi_detach_interface;
735f2c6e
TA		 4064 c->checkpoint = lxcapi_checkpoint;
4065 c->restore = lxcapi_restore;
72d0e1cb 4066
72d0e1cb
SG		 4067 return c;
4068
4069err:
4070 lxc_container_free(c);
4071 return NULL;
4072}
4073
4a7c7daa 4074int lxc_get_wait_states(const char **states)
72d0e1cb
SG		 4075{
4076 int i;
4077
4078 if (states)
4079 for (i=0; i<MAX_STATE; i++)
4080 states[i] = lxc_state2str(i);
4081 return MAX_STATE;
4082}
a41f104b 4083
a41f104b
SH		 4084/*
4085 * These next two could probably be done smarter with reusing a common function
4086 * with different iterators and tests...
4087 */
4088int list_defined_containers(const char *lxcpath, char ***names, struct lxc_container ***cret)
4089{
4090 DIR *dir;
4091 int i, cfound = 0, nfound = 0;
4092 struct dirent dirent, *direntp;
4093 struct lxc_container *c;
4094
4095 if (!lxcpath)
593e8478 4096 lxcpath = lxc_global_config_value("lxc.lxcpath");
a41f104b 4097
a41f104b 4098 dir = opendir(lxcpath);
a41f104b
SH		 4099 if (!dir) {
4100 SYSERROR("opendir on lxcpath");
4101 return -1;
4102 }
4103
4104 if (cret)
4105 *cret = NULL;
4106 if (names)
4107 *names = NULL;
4108
4109 while (!readdir_r(dir, &dirent, &direntp)) {
4110 if (!direntp)
4111 break;
4112 if (!strcmp(direntp->d_name, "."))
4113 continue;
4114 if (!strcmp(direntp->d_name, ".."))
4115 continue;
4116
4117 if (!config_file_exists(lxcpath, direntp->d_name))
4118 continue;
4119
4120 if (names) {
9c88ff1f 4121 if (!add_to_array(names, direntp->d_name, cfound))
a41f104b
SH		 4122 goto free_bad;
4123 }
4124 cfound++;
4125
4126 if (!cret) {
4127 nfound++;
4128 continue;
4129 }
4130
4131 c = lxc_container_new(direntp->d_name, lxcpath);
4132 if (!c) {
4133 INFO("Container %s:%s has a config but could not be loaded",
4134 lxcpath, direntp->d_name);
4135 if (names)
9c88ff1f
ÇO		 4136 if(!remove_from_array(names, direntp->d_name, cfound--))
4137 goto free_bad;
a41f104b
SH		 4138 continue;
4139 }
858377e4 4140 if (!do_lxcapi_is_defined(c)) {
a41f104b
SH		 4141 INFO("Container %s:%s has a config but is not defined",
4142 lxcpath, direntp->d_name);
4143 if (names)
9c88ff1f
ÇO		 4144 if(!remove_from_array(names, direntp->d_name, cfound--))
4145 goto free_bad;
a41f104b
SH		 4146 lxc_container_put(c);
4147 continue;
4148 }
4149
2871830a 4150 if (!add_to_clist(cret, c, nfound, true)) {
a41f104b
SH		 4151 lxc_container_put(c);
4152 goto free_bad;
4153 }
4154 nfound++;
4155 }
4156
a41f104b 4157 closedir(dir);
a41f104b
SH		 4158 return nfound;
4159
4160free_bad:
4161 if (names && *names) {
4162 for (i=0; i<cfound; i++)
4163 free((*names)[i]);
4164 free(*names);
4165 }
4166 if (cret && *cret) {
4167 for (i=0; i<nfound; i++)
4168 lxc_container_put((*cret)[i]);
4169 free(*cret);
4170 }
a41f104b 4171 closedir(dir);
a41f104b
SH		 4172 return -1;
4173}
4174
148a9d27
DE		 4175int list_active_containers(const char *lxcpath, char ***nret,
4176 struct lxc_container ***cret)
a41f104b 4177{
148a9d27 4178 int i, ret = -1, cret_cnt = 0, ct_name_cnt = 0;
a41f104b
SH		 4179 int lxcpath_len;
4180 char *line = NULL;
148a9d27 4181 char **ct_name = NULL;
a41f104b
SH		 4182 size_t len = 0;
4183 struct lxc_container *c;
88556fd7 4184 bool is_hashed;
a41f104b
SH		 4185
4186 if (!lxcpath)
593e8478 4187 lxcpath = lxc_global_config_value("lxc.lxcpath");
a41f104b
SH		 4188 lxcpath_len = strlen(lxcpath);
4189
4190 if (cret)
4191 *cret = NULL;
148a9d27
DE		 4192 if (nret)
4193 *nret = NULL;
a41f104b 4194
a41f104b 4195 FILE *f = fopen("/proc/net/unix", "r");
a41f104b
SH		 4196 if (!f)
4197 return -1;
4198
4199 while (getline(&line, &len, f) != -1) {
88556fd7 4200
0f8f9c8a 4201 char *p = strrchr(line, ' '), *p2;
a41f104b
SH		 4202 if (!p)
4203 continue;
4204 p++;
4205 if (*p != 0x40)
4206 continue;
4207 p++;
88556fd7
ÇO		 4208
4209 is_hashed = false;
4210 if (strncmp(p, lxcpath, lxcpath_len) == 0) {
4211 p += lxcpath_len;
4212 } else if (strncmp(p, "lxc/", 4) == 0) {
4213 p += 4;
4214 is_hashed = true;
4215 } else {
a41f104b 4216 continue;
88556fd7
ÇO		 4217 }
4218
a41f104b
SH		 4219 while (*p == '/')
4220 p++;
4221
4222 // Now p is the start of lxc_name
46cd2845 4223 p2 = strchr(p, '/');
a41f104b
SH		 4224 if (!p2 || strncmp(p2, "/command", 8) != 0)
4225 continue;
4226 *p2 = '\0';
4227
88556fd7
ÇO		 4228 if (is_hashed) {
4229 if (strncmp(lxcpath, lxc_cmd_get_lxcpath(p), lxcpath_len) != 0)
4230 continue;
4231 p = lxc_cmd_get_name(p);
4232 }
4233
148a9d27 4234 if (array_contains(&ct_name, p, ct_name_cnt))
9c88ff1f
ÇO		 4235 continue;
4236
148a9d27
DE		 4237 if (!add_to_array(&ct_name, p, ct_name_cnt))
4238 goto free_cret_list;
9c88ff1f 4239
148a9d27 4240 ct_name_cnt++;
a41f104b 4241
148a9d27 4242 if (!cret)
a41f104b 4243 continue;
a41f104b
SH		 4244
4245 c = lxc_container_new(p, lxcpath);
4246 if (!c) {
4247 INFO("Container %s:%s is running but could not be loaded",
4248 lxcpath, p);
148a9d27 4249 remove_from_array(&ct_name, p, ct_name_cnt--);
a41f104b
SH		 4250 continue;
4251 }
4252
4253 /*
4254 * If this is an anonymous container, then is_defined *can*
4255 * return false. So we don't do that check. Count on the
4256 * fact that the command socket exists.
4257 */
4258
148a9d27 4259 if (!add_to_clist(cret, c, cret_cnt, true)) {
a41f104b 4260 lxc_container_put(c);
148a9d27 4261 goto free_cret_list;
a41f104b 4262 }
148a9d27 4263 cret_cnt++;
a41f104b
SH		 4264 }
4265
148a9d27
DE		 4266 assert(!nret || !cret || cret_cnt == ct_name_cnt);
4267 ret = ct_name_cnt;
4268 if (nret)
4269 *nret = ct_name;
4270 else
4271 goto free_ct_name;
4272 goto out;
a41f104b 4273
148a9d27 4274free_cret_list:
a41f104b 4275 if (cret && *cret) {
148a9d27 4276 for (i = 0; i < cret_cnt; i++)
a41f104b
SH		 4277 lxc_container_put((*cret)[i]);
4278 free(*cret);
4279 }
148a9d27
DE		 4280
4281free_ct_name:
4282 if (ct_name) {
4283 for (i = 0; i < ct_name_cnt; i++)
4284 free(ct_name[i]);
4285 free(ct_name);
4286 }
4287
4288out:
f10fad2f 4289 free(line);
e853a32d 4290
a41f104b 4291 fclose(f);
148a9d27 4292 return ret;
a41f104b 4293}
2871830a
DE		 4294
4295int list_all_containers(const char *lxcpath, char ***nret,
4296 struct lxc_container ***cret)
4297{
4298 int i, ret, active_cnt, ct_cnt, ct_list_cnt;
4299 char **active_name;
4300 char **ct_name;
4301 struct lxc_container **ct_list = NULL;
4302
4303 ct_cnt = list_defined_containers(lxcpath, &ct_name, NULL);
4304 if (ct_cnt < 0)
4305 return ct_cnt;
4306
4307 active_cnt = list_active_containers(lxcpath, &active_name, NULL);
4308 if (active_cnt < 0) {
4309 ret = active_cnt;
4310 goto free_ct_name;
4311 }
4312
4313 for (i = 0; i < active_cnt; i++) {
4314 if (!array_contains(&ct_name, active_name[i], ct_cnt)) {
4315 if (!add_to_array(&ct_name, active_name[i], ct_cnt)) {
4316 ret = -1;
4317 goto free_active_name;
4318 }
4319 ct_cnt++;
4320 }
4321 free(active_name[i]);
4322 active_name[i] = NULL;
4323 }
4324 free(active_name);
4325 active_name = NULL;
4326 active_cnt = 0;
4327
4328 for (i = 0, ct_list_cnt = 0; i < ct_cnt && cret; i++) {
4329 struct lxc_container *c;
4330
4331 c = lxc_container_new(ct_name[i], lxcpath);
4332 if (!c) {
4333 WARN("Container %s:%s could not be loaded", lxcpath, ct_name[i]);
4334 remove_from_array(&ct_name, ct_name[i], ct_cnt--);
4335 continue;
4336 }
4337
4338 if (!add_to_clist(&ct_list, c, ct_list_cnt, false)) {
4339 lxc_container_put(c);
4340 ret = -1;
4341 goto free_ct_list;
4342 }
4343 ct_list_cnt++;
4344 }
4345
4346 if (cret)
4347 *cret = ct_list;
4348
4349 if (nret)
4350 *nret = ct_name;
4351 else {
4352 ret = ct_cnt;
4353 goto free_ct_name;
4354 }
4355 return ct_cnt;
4356
4357free_ct_list:
4358 for (i = 0; i < ct_list_cnt; i++) {
4359 lxc_container_put(ct_list[i]);
4360 }
f10fad2f 4361 free(ct_list);
2871830a
DE		 4362
4363free_active_name:
4364 for (i = 0; i < active_cnt; i++) {
f10fad2f 4365 free(active_name[i]);
2871830a 4366 }
f10fad2f 4367 free(active_name);
2871830a
DE		 4368
4369free_ct_name:
4370 for (i = 0; i < ct_cnt; i++) {
4371 free(ct_name[i]);
4372 }
4373 free(ct_name);
4374 return ret;
4375}
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