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Commit | Line | Data |
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e3642c43 DL |
1 | /* |
2 | * lxc: linux Container library | |
3 | * | |
4 | * (C) Copyright IBM Corp. 2007, 2008 | |
5 | * | |
6 | * Authors: | |
9afe19d6 | 7 | * Daniel Lezcano <daniel.lezcano at free.fr> |
e3642c43 DL |
8 | * |
9 | * This library is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU Lesser General Public | |
11 | * License as published by the Free Software Foundation; either | |
12 | * version 2.1 of the License, or (at your option) any later version. | |
13 | * | |
14 | * This library is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
17 | * Lesser General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU Lesser General Public | |
20 | * License along with this library; if not, write to the Free Software | |
250b1eec | 21 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
e3642c43 DL |
22 | */ |
23 | ||
052616eb ÇO |
24 | #include "config.h" |
25 | ||
e3642c43 DL |
26 | #include <errno.h> |
27 | #include <unistd.h> | |
d983b93c MN |
28 | #include <stdlib.h> |
29 | #include <stddef.h> | |
61a1d519 | 30 | #include <string.h> |
e3642c43 | 31 | #include <sys/types.h> |
0cc417b2 | 32 | #include <sys/vfs.h> |
e3642c43 DL |
33 | #include <sys/stat.h> |
34 | #include <sys/mman.h> | |
d983b93c | 35 | #include <sys/param.h> |
6e4bb2e0 | 36 | #include <sys/mount.h> |
d983b93c MN |
37 | #include <dirent.h> |
38 | #include <fcntl.h> | |
1b09f2c0 | 39 | #include <libgen.h> |
9be53773 SH |
40 | #include <sys/types.h> |
41 | #include <sys/wait.h> | |
502657d5 | 42 | #include <assert.h> |
0a4be28d | 43 | #include <sys/prctl.h> |
e3642c43 | 44 | |
3ce74686 | 45 | #include "utils.h" |
e3642c43 | 46 | #include "log.h" |
025ed0f3 | 47 | #include "lxclock.h" |
51d0854c | 48 | #include "namespace.h" |
e3642c43 | 49 | |
5d6ef228 SG |
50 | #ifndef PR_SET_MM |
51 | #define PR_SET_MM 35 | |
52 | #endif | |
53 | ||
553347e4 TA |
54 | #ifndef PR_SET_MM_ARG_START |
55 | #define PR_SET_MM_ARG_START 8 | |
56 | #endif | |
57 | ||
58 | #ifndef PR_SET_MM_ARG_END | |
59 | #define PR_SET_MM_ARG_END 9 | |
60 | #endif | |
61 | ||
62 | #ifndef PR_SET_MM_ENV_START | |
63 | #define PR_SET_MM_ENV_START 10 | |
64 | #endif | |
65 | ||
66 | #ifndef PR_SET_MM_ENV_END | |
67 | #define PR_SET_MM_ENV_END 11 | |
68 | #endif | |
69 | ||
e3642c43 DL |
70 | lxc_log_define(lxc_utils, lxc); |
71 | ||
0cc417b2 SH |
72 | static int _recursive_rmdir(char *dirname, dev_t pdev, |
73 | const char *exclude, int level, bool onedev) | |
60bf62d4 SH |
74 | { |
75 | struct dirent dirent, *direntp; | |
76 | DIR *dir; | |
77 | int ret, failed=0; | |
78 | char pathname[MAXPATHLEN]; | |
18aa217b | 79 | bool hadexclude = false; |
60bf62d4 SH |
80 | |
81 | dir = opendir(dirname); | |
82 | if (!dir) { | |
83 | ERROR("%s: failed to open %s", __func__, dirname); | |
4355ab5f | 84 | return -1; |
60bf62d4 SH |
85 | } |
86 | ||
87 | while (!readdir_r(dir, &dirent, &direntp)) { | |
88 | struct stat mystat; | |
89 | int rc; | |
90 | ||
91 | if (!direntp) | |
92 | break; | |
93 | ||
94 | if (!strcmp(direntp->d_name, ".") || | |
95 | !strcmp(direntp->d_name, "..")) | |
96 | continue; | |
97 | ||
98 | rc = snprintf(pathname, MAXPATHLEN, "%s/%s", dirname, direntp->d_name); | |
99 | if (rc < 0 || rc >= MAXPATHLEN) { | |
100 | ERROR("pathname too long"); | |
101 | failed=1; | |
102 | continue; | |
103 | } | |
18aa217b SH |
104 | |
105 | if (!level && exclude && !strcmp(direntp->d_name, exclude)) { | |
106 | ret = rmdir(pathname); | |
107 | if (ret < 0) { | |
108 | switch(errno) { | |
109 | case ENOTEMPTY: | |
0cc417b2 | 110 | INFO("Not deleting snapshot %s", pathname); |
18aa217b SH |
111 | hadexclude = true; |
112 | break; | |
113 | case ENOTDIR: | |
114 | ret = unlink(pathname); | |
115 | if (ret) | |
116 | INFO("%s: failed to remove %s", __func__, pathname); | |
117 | break; | |
118 | default: | |
119 | SYSERROR("%s: failed to rmdir %s", __func__, pathname); | |
120 | failed = 1; | |
121 | break; | |
122 | } | |
123 | } | |
124 | continue; | |
125 | } | |
126 | ||
60bf62d4 SH |
127 | ret = lstat(pathname, &mystat); |
128 | if (ret) { | |
129 | ERROR("%s: failed to stat %s", __func__, pathname); | |
130 | failed=1; | |
131 | continue; | |
132 | } | |
0cc417b2 | 133 | if (onedev && mystat.st_dev != pdev) |
60bf62d4 SH |
134 | continue; |
135 | if (S_ISDIR(mystat.st_mode)) { | |
0cc417b2 | 136 | if (_recursive_rmdir(pathname, pdev, exclude, level+1, onedev) < 0) |
60bf62d4 SH |
137 | failed=1; |
138 | } else { | |
139 | if (unlink(pathname) < 0) { | |
0cc417b2 | 140 | SYSERROR("%s: failed to delete %s", __func__, pathname); |
60bf62d4 SH |
141 | failed=1; |
142 | } | |
143 | } | |
144 | } | |
145 | ||
146 | if (rmdir(dirname) < 0) { | |
18aa217b SH |
147 | if (!hadexclude) { |
148 | ERROR("%s: failed to delete %s", __func__, dirname); | |
149 | failed=1; | |
150 | } | |
60bf62d4 SH |
151 | } |
152 | ||
025ed0f3 | 153 | ret = closedir(dir); |
025ed0f3 | 154 | if (ret) { |
60bf62d4 SH |
155 | ERROR("%s: failed to close directory %s", __func__, dirname); |
156 | failed=1; | |
157 | } | |
158 | ||
4355ab5f | 159 | return failed ? -1 : 0; |
60bf62d4 SH |
160 | } |
161 | ||
0cc417b2 SH |
162 | /* we have two different magic values for overlayfs, yay */ |
163 | #define OVERLAYFS_SUPER_MAGIC 0x794c764f | |
164 | #define OVERLAY_SUPER_MAGIC 0x794c7630 | |
165 | /* | |
166 | * In overlayfs, st_dev is unreliable. so on overlayfs we don't do | |
167 | * the lxc_rmdir_onedev() | |
168 | */ | |
169 | static bool is_native_overlayfs(const char *path) | |
170 | { | |
171 | struct statfs sb; | |
172 | ||
173 | if (statfs(path, &sb) < 0) | |
174 | return false; | |
175 | if (sb.f_type == OVERLAYFS_SUPER_MAGIC || | |
176 | sb.f_type == OVERLAY_SUPER_MAGIC) | |
177 | return true; | |
178 | return false; | |
179 | } | |
180 | ||
4355ab5f | 181 | /* returns 0 on success, -1 if there were any failures */ |
18aa217b | 182 | extern int lxc_rmdir_onedev(char *path, const char *exclude) |
60bf62d4 SH |
183 | { |
184 | struct stat mystat; | |
0cc417b2 SH |
185 | bool onedev = true; |
186 | ||
187 | if (is_native_overlayfs(path)) { | |
188 | onedev = false; | |
189 | } | |
60bf62d4 SH |
190 | |
191 | if (lstat(path, &mystat) < 0) { | |
192 | ERROR("%s: failed to stat %s", __func__, path); | |
4355ab5f | 193 | return -1; |
60bf62d4 SH |
194 | } |
195 | ||
0cc417b2 | 196 | return _recursive_rmdir(path, mystat.st_dev, exclude, 0, onedev); |
60bf62d4 SH |
197 | } |
198 | ||
6e4bb2e0 MN |
199 | static int mount_fs(const char *source, const char *target, const char *type) |
200 | { | |
201 | /* the umount may fail */ | |
202 | if (umount(target)) | |
203 | WARN("failed to unmount %s : %s", target, strerror(errno)); | |
204 | ||
205 | if (mount(source, target, type, 0, NULL)) { | |
206 | ERROR("failed to mount %s : %s", target, strerror(errno)); | |
207 | return -1; | |
208 | } | |
209 | ||
210 | DEBUG("'%s' mounted on '%s'", source, target); | |
211 | ||
212 | return 0; | |
213 | } | |
214 | ||
ea0da529 | 215 | extern void lxc_setup_fs(void) |
6e4bb2e0 MN |
216 | { |
217 | if (mount_fs("proc", "/proc", "proc")) | |
ea0da529 | 218 | INFO("failed to remount proc"); |
6e4bb2e0 | 219 | |
721d262c | 220 | /* if we can't mount /dev/shm, continue anyway */ |
6e4bb2e0 | 221 | if (mount_fs("shmfs", "/dev/shm", "tmpfs")) |
3283db09 | 222 | INFO("failed to mount /dev/shm"); |
6e4bb2e0 MN |
223 | |
224 | /* If we were able to mount /dev/shm, then /dev exists */ | |
b91b1cd7 | 225 | /* Sure, but it's read-only per config :) */ |
6e4bb2e0 | 226 | if (access("/dev/mqueue", F_OK) && mkdir("/dev/mqueue", 0666)) { |
b91b1cd7 | 227 | DEBUG("failed to create '/dev/mqueue'"); |
ea0da529 | 228 | return; |
6e4bb2e0 MN |
229 | } |
230 | ||
5d4d3ebb | 231 | /* continue even without posix message queue support */ |
6e4bb2e0 | 232 | if (mount_fs("mqueue", "/dev/mqueue", "mqueue")) |
5d4d3ebb | 233 | INFO("failed to mount /dev/mqueue"); |
6e4bb2e0 | 234 | } |
9ddaf3bf JHS |
235 | |
236 | /* borrowed from iproute2 */ | |
7c11d57a | 237 | extern int get_u16(unsigned short *val, const char *arg, int base) |
9ddaf3bf JHS |
238 | { |
239 | unsigned long res; | |
240 | char *ptr; | |
241 | ||
242 | if (!arg || !*arg) | |
243 | return -1; | |
244 | ||
09bbd745 | 245 | errno = 0; |
9ddaf3bf | 246 | res = strtoul(arg, &ptr, base); |
09bbd745 | 247 | if (!ptr || ptr == arg || *ptr || res > 0xFFFF || errno != 0) |
9ddaf3bf JHS |
248 | return -1; |
249 | ||
250 | *val = res; | |
251 | ||
252 | return 0; | |
253 | } | |
254 | ||
3ce74686 | 255 | extern int mkdir_p(const char *dir, mode_t mode) |
1b09f2c0 | 256 | { |
3ce74686 SH |
257 | const char *tmp = dir; |
258 | const char *orig = dir; | |
860fc865 RW |
259 | char *makeme; |
260 | ||
261 | do { | |
262 | dir = tmp + strspn(tmp, "/"); | |
263 | tmp = dir + strcspn(dir, "/"); | |
d74325c4 | 264 | makeme = strndup(orig, dir - orig); |
860fc865 RW |
265 | if (*makeme) { |
266 | if (mkdir(makeme, mode) && errno != EEXIST) { | |
959aee9c | 267 | SYSERROR("failed to create directory '%s'", makeme); |
d74325c4 | 268 | free(makeme); |
860fc865 RW |
269 | return -1; |
270 | } | |
271 | } | |
d74325c4 | 272 | free(makeme); |
860fc865 | 273 | } while(tmp != dir); |
1b09f2c0 | 274 | |
98663823 | 275 | return 0; |
1b09f2c0 | 276 | } |
2a59a681 | 277 | |
89cd7793 QH |
278 | extern void remove_trailing_slashes(char *p) |
279 | { | |
280 | int l = strlen(p); | |
281 | while (--l >= 0 && (p[l] == '/' || p[l] == '\n')) | |
282 | p[l] = '\0'; | |
283 | } | |
284 | ||
d0386d66 | 285 | static char *copy_global_config_value(char *p) |
2a59a681 SH |
286 | { |
287 | int len = strlen(p); | |
288 | char *retbuf; | |
289 | ||
290 | if (len < 1) | |
291 | return NULL; | |
292 | if (p[len-1] == '\n') { | |
293 | p[len-1] = '\0'; | |
294 | len--; | |
295 | } | |
296 | retbuf = malloc(len+1); | |
297 | if (!retbuf) | |
298 | return NULL; | |
299 | strcpy(retbuf, p); | |
300 | return retbuf; | |
301 | } | |
302 | ||
31a95fec | 303 | #define DEFAULT_VG "lxc" |
055af165 | 304 | #define DEFAULT_THIN_POOL "lxc" |
31a95fec | 305 | #define DEFAULT_ZFSROOT "lxc" |
67e571de | 306 | |
593e8478 | 307 | const char *lxc_global_config_value(const char *option_name) |
31a95fec | 308 | { |
74a3920a | 309 | static const char * const options[][2] = { |
2e59ba02 SG |
310 | { "lxc.bdev.lvm.vg", DEFAULT_VG }, |
311 | { "lxc.bdev.lvm.thin_pool", DEFAULT_THIN_POOL }, | |
312 | { "lxc.bdev.zfs.root", DEFAULT_ZFSROOT }, | |
313 | { "lxc.lxcpath", NULL }, | |
314 | { "lxc.default_config", NULL }, | |
5e1c5795 | 315 | { "lxc.cgroup.pattern", NULL }, |
2e59ba02 | 316 | { "lxc.cgroup.use", NULL }, |
d0386d66 CS |
317 | { NULL, NULL }, |
318 | }; | |
4878dac4 | 319 | |
93c379f0 | 320 | /* placed in the thread local storage pool for non-bionic targets */ |
babbea4b ÇO |
321 | #ifdef HAVE_TLS |
322 | static __thread const char *values[sizeof(options) / sizeof(options[0])] = { 0 }; | |
323 | #else | |
91664352 | 324 | static const char *values[sizeof(options) / sizeof(options[0])] = { 0 }; |
babbea4b | 325 | #endif |
48921d92 SH |
326 | |
327 | /* user_config_path is freed as soon as it is used */ | |
4878dac4 | 328 | char *user_config_path = NULL; |
48921d92 SH |
329 | |
330 | /* | |
331 | * The following variables are freed at bottom unconditionally. | |
332 | * So NULL the value if it is to be returned to the caller | |
333 | */ | |
9e8be781 | 334 | char *user_default_config_path = NULL; |
4878dac4 | 335 | char *user_lxc_path = NULL; |
5e1c5795 | 336 | char *user_cgroup_pattern = NULL; |
4878dac4 SG |
337 | |
338 | if (geteuid() > 0) { | |
6ed46d9e AM |
339 | const char *user_home = getenv("HOME"); |
340 | if (!user_home) | |
e99facec | 341 | user_home = "/"; |
4878dac4 SG |
342 | |
343 | user_config_path = malloc(sizeof(char) * (22 + strlen(user_home))); | |
9e8be781 | 344 | user_default_config_path = malloc(sizeof(char) * (26 + strlen(user_home))); |
4878dac4 SG |
345 | user_lxc_path = malloc(sizeof(char) * (19 + strlen(user_home))); |
346 | ||
347 | sprintf(user_config_path, "%s/.config/lxc/lxc.conf", user_home); | |
9e8be781 | 348 | sprintf(user_default_config_path, "%s/.config/lxc/default.conf", user_home); |
4878dac4 | 349 | sprintf(user_lxc_path, "%s/.local/share/lxc/", user_home); |
89a4ec73 | 350 | user_cgroup_pattern = strdup("lxc/%n"); |
4878dac4 SG |
351 | } |
352 | else { | |
353 | user_config_path = strdup(LXC_GLOBAL_CONF); | |
9e8be781 | 354 | user_default_config_path = strdup(LXC_DEFAULT_CONFIG); |
4878dac4 | 355 | user_lxc_path = strdup(LXCPATH); |
5e1c5795 | 356 | user_cgroup_pattern = strdup(DEFAULT_CGROUP_PATTERN); |
4878dac4 SG |
357 | } |
358 | ||
74a3920a | 359 | const char * const (*ptr)[2]; |
d0386d66 CS |
360 | size_t i; |
361 | char buf[1024], *p, *p2; | |
362 | FILE *fin = NULL; | |
363 | ||
364 | for (i = 0, ptr = options; (*ptr)[0]; ptr++, i++) { | |
365 | if (!strcmp(option_name, (*ptr)[0])) | |
366 | break; | |
367 | } | |
368 | if (!(*ptr)[0]) { | |
4878dac4 | 369 | free(user_config_path); |
9e8be781 | 370 | free(user_default_config_path); |
4878dac4 | 371 | free(user_lxc_path); |
5e1c5795 | 372 | free(user_cgroup_pattern); |
d0386d66 CS |
373 | errno = EINVAL; |
374 | return NULL; | |
375 | } | |
052616eb | 376 | |
052616eb | 377 | if (values[i]) { |
4878dac4 | 378 | free(user_config_path); |
9e8be781 | 379 | free(user_default_config_path); |
4878dac4 | 380 | free(user_lxc_path); |
5e1c5795 | 381 | free(user_cgroup_pattern); |
babbea4b | 382 | return values[i]; |
052616eb | 383 | } |
31a95fec | 384 | |
4878dac4 SG |
385 | fin = fopen_cloexec(user_config_path, "r"); |
386 | free(user_config_path); | |
31a95fec SH |
387 | if (fin) { |
388 | while (fgets(buf, 1024, fin)) { | |
389 | if (buf[0] == '#') | |
390 | continue; | |
d0386d66 | 391 | p = strstr(buf, option_name); |
31a95fec SH |
392 | if (!p) |
393 | continue; | |
d0386d66 CS |
394 | /* see if there was just white space in front |
395 | * of the option name | |
396 | */ | |
397 | for (p2 = buf; p2 < p; p2++) { | |
398 | if (*p2 != ' ' && *p2 != '\t') | |
399 | break; | |
400 | } | |
401 | if (p2 < p) | |
402 | continue; | |
31a95fec SH |
403 | p = strchr(p, '='); |
404 | if (!p) | |
405 | continue; | |
d0386d66 CS |
406 | /* see if there was just white space after |
407 | * the option name | |
408 | */ | |
409 | for (p2 += strlen(option_name); p2 < p; p2++) { | |
410 | if (*p2 != ' ' && *p2 != '\t') | |
411 | break; | |
412 | } | |
413 | if (p2 < p) | |
414 | continue; | |
31a95fec SH |
415 | p++; |
416 | while (*p && (*p == ' ' || *p == '\t')) p++; | |
417 | if (!*p) | |
418 | continue; | |
f407c5e4 | 419 | |
f407c5e4 SG |
420 | if (strcmp(option_name, "lxc.lxcpath") == 0) { |
421 | free(user_lxc_path); | |
422 | user_lxc_path = copy_global_config_value(p); | |
423 | remove_trailing_slashes(user_lxc_path); | |
424 | values[i] = user_lxc_path; | |
a1c9a9c9 | 425 | user_lxc_path = NULL; |
f407c5e4 SG |
426 | goto out; |
427 | } | |
428 | ||
429 | values[i] = copy_global_config_value(p); | |
31a95fec SH |
430 | goto out; |
431 | } | |
432 | } | |
d0386d66 | 433 | /* could not find value, use default */ |
9e8be781 | 434 | if (strcmp(option_name, "lxc.lxcpath") == 0) { |
f407c5e4 | 435 | remove_trailing_slashes(user_lxc_path); |
4878dac4 | 436 | values[i] = user_lxc_path; |
48921d92 | 437 | user_lxc_path = NULL; |
9e8be781 SG |
438 | } |
439 | else if (strcmp(option_name, "lxc.default_config") == 0) { | |
440 | values[i] = user_default_config_path; | |
48921d92 | 441 | user_default_config_path = NULL; |
5e1c5795 KY |
442 | } |
443 | else if (strcmp(option_name, "lxc.cgroup.pattern") == 0) { | |
444 | values[i] = user_cgroup_pattern; | |
48921d92 | 445 | user_cgroup_pattern = NULL; |
9e8be781 | 446 | } |
48921d92 | 447 | else |
4878dac4 | 448 | values[i] = (*ptr)[1]; |
48921d92 | 449 | |
d0386d66 CS |
450 | /* special case: if default value is NULL, |
451 | * and there is no config, don't view that | |
452 | * as an error... */ | |
453 | if (!values[i]) | |
454 | errno = 0; | |
31a95fec SH |
455 | |
456 | out: | |
457 | if (fin) | |
458 | fclose(fin); | |
41f68357 | 459 | |
48921d92 SH |
460 | free(user_cgroup_pattern); |
461 | free(user_default_config_path); | |
462 | free(user_lxc_path); | |
463 | ||
babbea4b | 464 | return values[i]; |
31a95fec SH |
465 | } |
466 | ||
44b9ae4b | 467 | char *get_rundir() |
9e60f51d | 468 | { |
97a696c6 SG |
469 | char *rundir; |
470 | const char *homedir; | |
9e60f51d | 471 | |
d6470e71 | 472 | if (geteuid() == 0) { |
c580b8d2 | 473 | rundir = strdup(RUNTIME_PATH); |
d6470e71 SG |
474 | return rundir; |
475 | } | |
97a696c6 SG |
476 | |
477 | rundir = getenv("XDG_RUNTIME_DIR"); | |
44b9ae4b SG |
478 | if (rundir) { |
479 | rundir = strdup(rundir); | |
480 | return rundir; | |
481 | } | |
97a696c6 | 482 | |
44b9ae4b SG |
483 | INFO("XDG_RUNTIME_DIR isn't set in the environment."); |
484 | homedir = getenv("HOME"); | |
485 | if (!homedir) { | |
486 | ERROR("HOME isn't set in the environment."); | |
487 | return NULL; | |
97a696c6 SG |
488 | } |
489 | ||
44b9ae4b SG |
490 | rundir = malloc(sizeof(char) * (17 + strlen(homedir))); |
491 | sprintf(rundir, "%s/.cache/lxc/run/", homedir); | |
492 | ||
9e60f51d DE |
493 | return rundir; |
494 | } | |
495 | ||
9be53773 SH |
496 | int wait_for_pid(pid_t pid) |
497 | { | |
498 | int status, ret; | |
499 | ||
500 | again: | |
501 | ret = waitpid(pid, &status, 0); | |
502 | if (ret == -1) { | |
71b9b8ed | 503 | if (errno == EINTR) |
9be53773 SH |
504 | goto again; |
505 | return -1; | |
506 | } | |
507 | if (ret != pid) | |
508 | goto again; | |
509 | if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) | |
510 | return -1; | |
511 | return 0; | |
512 | } | |
c797a220 CS |
513 | |
514 | int lxc_wait_for_pid_status(pid_t pid) | |
515 | { | |
516 | int status, ret; | |
517 | ||
518 | again: | |
519 | ret = waitpid(pid, &status, 0); | |
520 | if (ret == -1) { | |
521 | if (errno == EINTR) | |
522 | goto again; | |
523 | return -1; | |
524 | } | |
525 | if (ret != pid) | |
526 | goto again; | |
527 | return status; | |
528 | } | |
92f023dc | 529 | |
650468bb | 530 | ssize_t lxc_write_nointr(int fd, const void* buf, size_t count) |
92f023dc | 531 | { |
650468bb | 532 | ssize_t ret; |
92f023dc CS |
533 | again: |
534 | ret = write(fd, buf, count); | |
535 | if (ret < 0 && errno == EINTR) | |
536 | goto again; | |
537 | return ret; | |
538 | } | |
539 | ||
650468bb | 540 | ssize_t lxc_read_nointr(int fd, void* buf, size_t count) |
92f023dc | 541 | { |
650468bb | 542 | ssize_t ret; |
92f023dc CS |
543 | again: |
544 | ret = read(fd, buf, count); | |
545 | if (ret < 0 && errno == EINTR) | |
546 | goto again; | |
547 | return ret; | |
548 | } | |
549 | ||
650468bb | 550 | ssize_t lxc_read_nointr_expect(int fd, void* buf, size_t count, const void* expected_buf) |
92f023dc | 551 | { |
650468bb | 552 | ssize_t ret; |
92f023dc CS |
553 | ret = lxc_read_nointr(fd, buf, count); |
554 | if (ret <= 0) | |
555 | return ret; | |
650468bb | 556 | if ((size_t)ret != count) |
92f023dc CS |
557 | return -1; |
558 | if (expected_buf && memcmp(buf, expected_buf, count) != 0) { | |
559 | errno = EINVAL; | |
560 | return -1; | |
561 | } | |
562 | return ret; | |
563 | } | |
3ce74686 SH |
564 | |
565 | #if HAVE_LIBGNUTLS | |
566 | #include <gnutls/gnutls.h> | |
567 | #include <gnutls/crypto.h> | |
41246cee DE |
568 | |
569 | __attribute__((constructor)) | |
570 | static void gnutls_lxc_init(void) | |
571 | { | |
572 | gnutls_global_init(); | |
573 | } | |
574 | ||
3ce74686 SH |
575 | int sha1sum_file(char *fnam, unsigned char *digest) |
576 | { | |
577 | char *buf; | |
578 | int ret; | |
579 | FILE *f; | |
580 | long flen; | |
581 | ||
582 | if (!fnam) | |
583 | return -1; | |
025ed0f3 | 584 | f = fopen_cloexec(fnam, "r"); |
7be677a8 | 585 | if (!f) { |
3ce74686 SH |
586 | SYSERROR("Error opening template"); |
587 | return -1; | |
588 | } | |
589 | if (fseek(f, 0, SEEK_END) < 0) { | |
590 | SYSERROR("Error seeking to end of template"); | |
dd1d77f9 | 591 | fclose(f); |
3ce74686 SH |
592 | return -1; |
593 | } | |
594 | if ((flen = ftell(f)) < 0) { | |
595 | SYSERROR("Error telling size of template"); | |
dd1d77f9 | 596 | fclose(f); |
3ce74686 SH |
597 | return -1; |
598 | } | |
599 | if (fseek(f, 0, SEEK_SET) < 0) { | |
600 | SYSERROR("Error seeking to start of template"); | |
dd1d77f9 | 601 | fclose(f); |
3ce74686 SH |
602 | return -1; |
603 | } | |
604 | if ((buf = malloc(flen+1)) == NULL) { | |
605 | SYSERROR("Out of memory"); | |
dd1d77f9 | 606 | fclose(f); |
3ce74686 SH |
607 | return -1; |
608 | } | |
609 | if (fread(buf, 1, flen, f) != flen) { | |
610 | SYSERROR("Failure reading template"); | |
611 | free(buf); | |
dd1d77f9 | 612 | fclose(f); |
3ce74686 SH |
613 | return -1; |
614 | } | |
dd1d77f9 | 615 | if (fclose(f) < 0) { |
3ce74686 SH |
616 | SYSERROR("Failre closing template"); |
617 | free(buf); | |
618 | return -1; | |
619 | } | |
620 | buf[flen] = '\0'; | |
621 | ret = gnutls_hash_fast(GNUTLS_DIG_SHA1, buf, flen, (void *)digest); | |
622 | free(buf); | |
623 | return ret; | |
624 | } | |
625 | #endif | |
61a1d519 CS |
626 | |
627 | char** lxc_va_arg_list_to_argv(va_list ap, size_t skip, int do_strdup) | |
628 | { | |
629 | va_list ap2; | |
630 | size_t count = 1 + skip; | |
631 | char **result; | |
632 | ||
633 | /* first determine size of argument list, we don't want to reallocate | |
634 | * constantly... | |
635 | */ | |
636 | va_copy(ap2, ap); | |
637 | while (1) { | |
638 | char* arg = va_arg(ap2, char*); | |
639 | if (!arg) | |
640 | break; | |
641 | count++; | |
642 | } | |
643 | va_end(ap2); | |
644 | ||
645 | result = calloc(count, sizeof(char*)); | |
646 | if (!result) | |
647 | return NULL; | |
648 | count = skip; | |
649 | while (1) { | |
650 | char* arg = va_arg(ap, char*); | |
651 | if (!arg) | |
652 | break; | |
653 | arg = do_strdup ? strdup(arg) : arg; | |
654 | if (!arg) | |
655 | goto oom; | |
656 | result[count++] = arg; | |
657 | } | |
658 | ||
659 | /* calloc has already set last element to NULL*/ | |
660 | return result; | |
661 | ||
662 | oom: | |
663 | free(result); | |
664 | return NULL; | |
665 | } | |
666 | ||
667 | const char** lxc_va_arg_list_to_argv_const(va_list ap, size_t skip) | |
668 | { | |
669 | return (const char**)lxc_va_arg_list_to_argv(ap, skip, 0); | |
670 | } | |
db27c8d7 CS |
671 | |
672 | FILE *fopen_cloexec(const char *path, const char *mode) | |
673 | { | |
674 | int open_mode = 0; | |
675 | int step = 0; | |
676 | int fd; | |
677 | int saved_errno = 0; | |
678 | FILE *ret; | |
679 | ||
680 | if (!strncmp(mode, "r+", 2)) { | |
681 | open_mode = O_RDWR; | |
682 | step = 2; | |
683 | } else if (!strncmp(mode, "r", 1)) { | |
684 | open_mode = O_RDONLY; | |
685 | step = 1; | |
686 | } else if (!strncmp(mode, "w+", 2)) { | |
687 | open_mode = O_RDWR | O_TRUNC | O_CREAT; | |
688 | step = 2; | |
689 | } else if (!strncmp(mode, "w", 1)) { | |
690 | open_mode = O_WRONLY | O_TRUNC | O_CREAT; | |
691 | step = 1; | |
692 | } else if (!strncmp(mode, "a+", 2)) { | |
693 | open_mode = O_RDWR | O_CREAT | O_APPEND; | |
694 | step = 2; | |
695 | } else if (!strncmp(mode, "a", 1)) { | |
696 | open_mode = O_WRONLY | O_CREAT | O_APPEND; | |
697 | step = 1; | |
698 | } | |
699 | for (; mode[step]; step++) | |
700 | if (mode[step] == 'x') | |
701 | open_mode |= O_EXCL; | |
702 | open_mode |= O_CLOEXEC; | |
703 | ||
82371fdd | 704 | fd = open(path, open_mode, 0666); |
db27c8d7 CS |
705 | if (fd < 0) |
706 | return NULL; | |
707 | ||
708 | ret = fdopen(fd, mode); | |
709 | saved_errno = errno; | |
710 | if (!ret) | |
711 | close(fd); | |
712 | errno = saved_errno; | |
713 | return ret; | |
714 | } | |
502657d5 | 715 | |
ebec9176 AM |
716 | extern struct lxc_popen_FILE *lxc_popen(const char *command) |
717 | { | |
718 | struct lxc_popen_FILE *fp = NULL; | |
719 | int parent_end = -1, child_end = -1; | |
720 | int pipe_fds[2]; | |
721 | pid_t child_pid; | |
722 | ||
723 | int r = pipe2(pipe_fds, O_CLOEXEC); | |
724 | ||
725 | if (r < 0) { | |
726 | ERROR("pipe2 failure"); | |
727 | return NULL; | |
728 | } | |
729 | ||
730 | parent_end = pipe_fds[0]; | |
731 | child_end = pipe_fds[1]; | |
732 | ||
733 | child_pid = fork(); | |
734 | ||
735 | if (child_pid == 0) { | |
736 | /* child */ | |
737 | int child_std_end = STDOUT_FILENO; | |
738 | ||
739 | if (child_end != child_std_end) { | |
740 | /* dup2() doesn't dup close-on-exec flag */ | |
741 | dup2(child_end, child_std_end); | |
742 | ||
743 | /* it's safe not to close child_end here | |
744 | * as it's marked close-on-exec anyway | |
745 | */ | |
746 | } else { | |
747 | /* | |
748 | * The descriptor is already the one we will use. | |
749 | * But it must not be marked close-on-exec. | |
750 | * Undo the effects. | |
751 | */ | |
57d2be54 SG |
752 | if (fcntl(child_end, F_SETFD, 0) != 0) { |
753 | SYSERROR("Failed to remove FD_CLOEXEC from fd."); | |
754 | exit(127); | |
755 | } | |
ebec9176 AM |
756 | } |
757 | ||
758 | /* | |
759 | * Unblock signals. | |
760 | * This is the main/only reason | |
761 | * why we do our lousy popen() emulation. | |
762 | */ | |
763 | { | |
764 | sigset_t mask; | |
765 | sigfillset(&mask); | |
766 | sigprocmask(SIG_UNBLOCK, &mask, NULL); | |
767 | } | |
768 | ||
769 | execl("/bin/sh", "sh", "-c", command, (char *) NULL); | |
770 | exit(127); | |
771 | } | |
772 | ||
773 | /* parent */ | |
774 | ||
775 | close(child_end); | |
776 | child_end = -1; | |
777 | ||
778 | if (child_pid < 0) { | |
779 | ERROR("fork failure"); | |
780 | goto error; | |
781 | } | |
782 | ||
783 | fp = calloc(1, sizeof(*fp)); | |
784 | if (!fp) { | |
785 | ERROR("failed to allocate memory"); | |
786 | goto error; | |
787 | } | |
788 | ||
789 | fp->f = fdopen(parent_end, "r"); | |
790 | if (!fp->f) { | |
791 | ERROR("fdopen failure"); | |
792 | goto error; | |
793 | } | |
794 | ||
795 | fp->child_pid = child_pid; | |
796 | ||
797 | return fp; | |
798 | ||
799 | error: | |
800 | ||
801 | if (fp) { | |
802 | if (fp->f) { | |
803 | fclose(fp->f); | |
804 | parent_end = -1; /* so we do not close it second time */ | |
805 | } | |
806 | ||
807 | free(fp); | |
808 | } | |
809 | ||
ebec9176 AM |
810 | if (parent_end != -1) |
811 | close(parent_end); | |
812 | ||
813 | return NULL; | |
814 | } | |
815 | ||
ebec9176 AM |
816 | extern int lxc_pclose(struct lxc_popen_FILE *fp) |
817 | { | |
818 | FILE *f = NULL; | |
819 | pid_t child_pid = 0; | |
820 | int wstatus = 0; | |
821 | pid_t wait_pid; | |
822 | ||
823 | if (fp) { | |
824 | f = fp->f; | |
825 | child_pid = fp->child_pid; | |
826 | /* free memory (we still need to close file stream) */ | |
827 | free(fp); | |
828 | fp = NULL; | |
829 | } | |
830 | ||
831 | if (!f || fclose(f)) { | |
832 | ERROR("fclose failure"); | |
833 | return -1; | |
834 | } | |
835 | ||
836 | do { | |
837 | wait_pid = waitpid(child_pid, &wstatus, 0); | |
838 | } while (wait_pid == -1 && errno == EINTR); | |
839 | ||
840 | if (wait_pid == -1) { | |
841 | ERROR("waitpid failure"); | |
842 | return -1; | |
843 | } | |
844 | ||
845 | return wstatus; | |
846 | } | |
847 | ||
502657d5 CS |
848 | char *lxc_string_replace(const char *needle, const char *replacement, const char *haystack) |
849 | { | |
850 | ssize_t len = -1, saved_len = -1; | |
851 | char *result = NULL; | |
852 | size_t replacement_len = strlen(replacement); | |
853 | size_t needle_len = strlen(needle); | |
854 | ||
855 | /* should be executed exactly twice */ | |
856 | while (len == -1 || result == NULL) { | |
857 | char *p; | |
858 | char *last_p; | |
859 | ssize_t part_len; | |
860 | ||
861 | if (len != -1) { | |
862 | result = calloc(1, len + 1); | |
863 | if (!result) | |
864 | return NULL; | |
865 | saved_len = len; | |
866 | } | |
867 | ||
868 | len = 0; | |
869 | ||
870 | for (last_p = (char *)haystack, p = strstr(last_p, needle); p; last_p = p, p = strstr(last_p, needle)) { | |
871 | part_len = (ssize_t)(p - last_p); | |
872 | if (result && part_len > 0) | |
873 | memcpy(&result[len], last_p, part_len); | |
874 | len += part_len; | |
875 | if (result && replacement_len > 0) | |
876 | memcpy(&result[len], replacement, replacement_len); | |
877 | len += replacement_len; | |
878 | p += needle_len; | |
879 | } | |
880 | part_len = strlen(last_p); | |
881 | if (result && part_len > 0) | |
882 | memcpy(&result[len], last_p, part_len); | |
883 | len += part_len; | |
884 | } | |
885 | ||
886 | /* make sure we did the same thing twice, | |
887 | * once for calculating length, the other | |
888 | * time for copying data */ | |
889 | assert(saved_len == len); | |
890 | /* make sure we didn't overwrite any buffer, | |
891 | * due to calloc the string should be 0-terminated */ | |
892 | assert(result[len] == '\0'); | |
893 | ||
894 | return result; | |
895 | } | |
896 | ||
897 | bool lxc_string_in_array(const char *needle, const char **haystack) | |
898 | { | |
899 | for (; haystack && *haystack; haystack++) | |
900 | if (!strcmp(needle, *haystack)) | |
901 | return true; | |
902 | return false; | |
903 | } | |
904 | ||
905 | char *lxc_string_join(const char *sep, const char **parts, bool use_as_prefix) | |
906 | { | |
907 | char *result; | |
908 | char **p; | |
909 | size_t sep_len = strlen(sep); | |
910 | size_t result_len = use_as_prefix * sep_len; | |
911 | ||
912 | /* calculate new string length */ | |
913 | for (p = (char **)parts; *p; p++) | |
914 | result_len += (p > (char **)parts) * sep_len + strlen(*p); | |
915 | ||
916 | result = calloc(result_len + 1, 1); | |
917 | if (!result) | |
918 | return NULL; | |
919 | ||
920 | if (use_as_prefix) | |
921 | strcpy(result, sep); | |
922 | for (p = (char **)parts; *p; p++) { | |
923 | if (p > (char **)parts) | |
924 | strcat(result, sep); | |
925 | strcat(result, *p); | |
926 | } | |
927 | ||
928 | return result; | |
929 | } | |
930 | ||
931 | char **lxc_normalize_path(const char *path) | |
932 | { | |
933 | char **components; | |
934 | char **p; | |
935 | size_t components_len = 0; | |
936 | size_t pos = 0; | |
937 | ||
938 | components = lxc_string_split(path, '/'); | |
939 | if (!components) | |
940 | return NULL; | |
941 | for (p = components; *p; p++) | |
942 | components_len++; | |
943 | ||
944 | /* resolve '.' and '..' */ | |
945 | for (pos = 0; pos < components_len; ) { | |
946 | if (!strcmp(components[pos], ".") || (!strcmp(components[pos], "..") && pos == 0)) { | |
947 | /* eat this element */ | |
948 | free(components[pos]); | |
949 | memmove(&components[pos], &components[pos+1], sizeof(char *) * (components_len - pos)); | |
950 | components_len--; | |
951 | } else if (!strcmp(components[pos], "..")) { | |
952 | /* eat this and the previous element */ | |
953 | free(components[pos - 1]); | |
954 | free(components[pos]); | |
955 | memmove(&components[pos-1], &components[pos+1], sizeof(char *) * (components_len - pos)); | |
956 | components_len -= 2; | |
957 | pos--; | |
958 | } else { | |
959 | pos++; | |
960 | } | |
961 | } | |
962 | ||
963 | return components; | |
964 | } | |
965 | ||
24b51482 CS |
966 | char *lxc_append_paths(const char *first, const char *second) |
967 | { | |
968 | size_t len = strlen(first) + strlen(second) + 1; | |
969 | const char *pattern = "%s%s"; | |
970 | char *result = NULL; | |
971 | ||
972 | if (second[0] != '/') { | |
973 | len += 1; | |
974 | pattern = "%s/%s"; | |
975 | } | |
976 | ||
977 | result = calloc(1, len); | |
978 | if (!result) | |
979 | return NULL; | |
980 | ||
981 | snprintf(result, len, pattern, first, second); | |
982 | return result; | |
983 | } | |
984 | ||
502657d5 CS |
985 | bool lxc_string_in_list(const char *needle, const char *haystack, char _sep) |
986 | { | |
987 | char *token, *str, *saveptr = NULL; | |
988 | char sep[2] = { _sep, '\0' }; | |
989 | ||
990 | if (!haystack || !needle) | |
991 | return 0; | |
992 | ||
993 | str = alloca(strlen(haystack)+1); | |
994 | strcpy(str, haystack); | |
995 | for (; (token = strtok_r(str, sep, &saveptr)); str = NULL) { | |
996 | if (strcmp(needle, token) == 0) | |
997 | return 1; | |
998 | } | |
999 | ||
1000 | return 0; | |
1001 | } | |
1002 | ||
1003 | char **lxc_string_split(const char *string, char _sep) | |
1004 | { | |
1005 | char *token, *str, *saveptr = NULL; | |
1006 | char sep[2] = { _sep, '\0' }; | |
1007 | char **result = NULL; | |
1008 | size_t result_capacity = 0; | |
1009 | size_t result_count = 0; | |
1010 | int r, saved_errno; | |
1011 | ||
1012 | if (!string) | |
1013 | return calloc(1, sizeof(char *)); | |
1014 | ||
1015 | str = alloca(strlen(string)+1); | |
1016 | strcpy(str, string); | |
1017 | for (; (token = strtok_r(str, sep, &saveptr)); str = NULL) { | |
1018 | r = lxc_grow_array((void ***)&result, &result_capacity, result_count + 1, 16); | |
1019 | if (r < 0) | |
1020 | goto error_out; | |
1021 | result[result_count] = strdup(token); | |
1022 | if (!result[result_count]) | |
1023 | goto error_out; | |
1024 | result_count++; | |
1025 | } | |
1026 | ||
1027 | /* if we allocated too much, reduce it */ | |
1028 | return realloc(result, (result_count + 1) * sizeof(char *)); | |
1029 | error_out: | |
1030 | saved_errno = errno; | |
1031 | lxc_free_array((void **)result, free); | |
1032 | errno = saved_errno; | |
1033 | return NULL; | |
1034 | } | |
1035 | ||
1036 | char **lxc_string_split_and_trim(const char *string, char _sep) | |
1037 | { | |
1038 | char *token, *str, *saveptr = NULL; | |
1039 | char sep[2] = { _sep, '\0' }; | |
1040 | char **result = NULL; | |
1041 | size_t result_capacity = 0; | |
1042 | size_t result_count = 0; | |
1043 | int r, saved_errno; | |
1044 | size_t i = 0; | |
1045 | ||
1046 | if (!string) | |
1047 | return calloc(1, sizeof(char *)); | |
1048 | ||
1049 | str = alloca(strlen(string)+1); | |
1050 | strcpy(str, string); | |
1051 | for (; (token = strtok_r(str, sep, &saveptr)); str = NULL) { | |
1052 | while (token[0] == ' ' || token[0] == '\t') | |
1053 | token++; | |
1054 | i = strlen(token); | |
1055 | while (i > 0 && (token[i - 1] == ' ' || token[i - 1] == '\t')) { | |
1056 | token[i - 1] = '\0'; | |
1057 | i--; | |
1058 | } | |
1059 | r = lxc_grow_array((void ***)&result, &result_capacity, result_count + 1, 16); | |
1060 | if (r < 0) | |
1061 | goto error_out; | |
1062 | result[result_count] = strdup(token); | |
1063 | if (!result[result_count]) | |
1064 | goto error_out; | |
1065 | result_count++; | |
1066 | } | |
1067 | ||
1068 | /* if we allocated too much, reduce it */ | |
1069 | return realloc(result, (result_count + 1) * sizeof(char *)); | |
1070 | error_out: | |
1071 | saved_errno = errno; | |
1072 | lxc_free_array((void **)result, free); | |
1073 | errno = saved_errno; | |
1074 | return NULL; | |
1075 | } | |
1076 | ||
1077 | void lxc_free_array(void **array, lxc_free_fn element_free_fn) | |
1078 | { | |
1079 | void **p; | |
1080 | for (p = array; p && *p; p++) | |
1081 | element_free_fn(*p); | |
1082 | free((void*)array); | |
1083 | } | |
1084 | ||
1085 | int lxc_grow_array(void ***array, size_t* capacity, size_t new_size, size_t capacity_increment) | |
1086 | { | |
1087 | size_t new_capacity; | |
1088 | void **new_array; | |
1089 | ||
1090 | /* first time around, catch some trivial mistakes of the user | |
1091 | * only initializing one of these */ | |
1092 | if (!*array || !*capacity) { | |
1093 | *array = NULL; | |
1094 | *capacity = 0; | |
1095 | } | |
1096 | ||
1097 | new_capacity = *capacity; | |
1098 | while (new_size + 1 > new_capacity) | |
1099 | new_capacity += capacity_increment; | |
1100 | if (new_capacity != *capacity) { | |
1101 | /* we have to reallocate */ | |
1102 | new_array = realloc(*array, new_capacity * sizeof(void *)); | |
1103 | if (!new_array) | |
1104 | return -1; | |
1105 | memset(&new_array[*capacity], 0, (new_capacity - (*capacity)) * sizeof(void *)); | |
1106 | *array = new_array; | |
1107 | *capacity = new_capacity; | |
1108 | } | |
1109 | ||
1110 | /* array has sufficient elements */ | |
1111 | return 0; | |
1112 | } | |
1113 | ||
1114 | size_t lxc_array_len(void **array) | |
1115 | { | |
1116 | void **p; | |
1117 | size_t result = 0; | |
1118 | ||
1119 | for (p = array; p && *p; p++) | |
1120 | result++; | |
1121 | ||
1122 | return result; | |
1123 | } | |
1124 | ||
0e95426b CS |
1125 | int lxc_write_to_file(const char *filename, const void* buf, size_t count, bool add_newline) |
1126 | { | |
1127 | int fd, saved_errno; | |
1128 | ssize_t ret; | |
1129 | ||
1130 | fd = open(filename, O_WRONLY | O_TRUNC | O_CREAT | O_CLOEXEC, 0666); | |
1131 | if (fd < 0) | |
1132 | return -1; | |
1133 | ret = lxc_write_nointr(fd, buf, count); | |
1134 | if (ret < 0) | |
799f29ab | 1135 | goto out_error; |
0e95426b CS |
1136 | if ((size_t)ret != count) |
1137 | goto out_error; | |
1138 | if (add_newline) { | |
1139 | ret = lxc_write_nointr(fd, "\n", 1); | |
1140 | if (ret != 1) | |
1141 | goto out_error; | |
1142 | } | |
1143 | close(fd); | |
1144 | return 0; | |
1145 | ||
1146 | out_error: | |
1147 | saved_errno = errno; | |
1148 | close(fd); | |
1149 | errno = saved_errno; | |
1150 | return -1; | |
1151 | } | |
1152 | ||
1153 | int lxc_read_from_file(const char *filename, void* buf, size_t count) | |
1154 | { | |
1155 | int fd = -1, saved_errno; | |
1156 | ssize_t ret; | |
1157 | ||
1158 | fd = open(filename, O_RDONLY | O_CLOEXEC); | |
1159 | if (fd < 0) | |
1160 | return -1; | |
1161 | ||
1162 | if (!buf || !count) { | |
1163 | char buf2[100]; | |
1164 | size_t count2 = 0; | |
1165 | while ((ret = read(fd, buf2, 100)) > 0) | |
1166 | count2 += ret; | |
1167 | if (ret >= 0) | |
1168 | ret = count2; | |
1169 | } else { | |
1170 | memset(buf, 0, count); | |
1171 | ret = read(fd, buf, count); | |
1172 | } | |
1173 | ||
1174 | if (ret < 0) | |
1175 | ERROR("read %s: %s", filename, strerror(errno)); | |
1176 | ||
1177 | saved_errno = errno; | |
1178 | close(fd); | |
1179 | errno = saved_errno; | |
1180 | return ret; | |
1181 | } | |
799f29ab ÇO |
1182 | |
1183 | void **lxc_append_null_to_array(void **array, size_t count) | |
1184 | { | |
1185 | void **temp; | |
1186 | ||
1187 | /* Append NULL to the array */ | |
1188 | if (count) { | |
1189 | temp = realloc(array, (count + 1) * sizeof(*array)); | |
1190 | if (!temp) { | |
1191 | int i; | |
1192 | for (i = 0; i < count; i++) | |
1193 | free(array[i]); | |
1194 | free(array); | |
1195 | return NULL; | |
1196 | } | |
1197 | array = temp; | |
1198 | array[count] = NULL; | |
1199 | } | |
1200 | return array; | |
1201 | } | |
508c263e SH |
1202 | |
1203 | int randseed(bool srand_it) | |
1204 | { | |
1205 | /* | |
1206 | srand pre-seed function based on /dev/urandom | |
1207 | */ | |
1208 | unsigned int seed=time(NULL)+getpid(); | |
1209 | ||
1210 | FILE *f; | |
1211 | f = fopen("/dev/urandom", "r"); | |
1212 | if (f) { | |
1213 | int ret = fread(&seed, sizeof(seed), 1, f); | |
1214 | if (ret != 1) | |
1215 | DEBUG("unable to fread /dev/urandom, %s, fallback to time+pid rand seed", strerror(errno)); | |
1216 | fclose(f); | |
1217 | } | |
1218 | ||
1219 | if (srand_it) | |
1220 | srand(seed); | |
1221 | ||
1222 | return seed; | |
1223 | } | |
5d897655 SH |
1224 | |
1225 | uid_t get_ns_uid(uid_t orig) | |
1226 | { | |
1227 | char *line = NULL; | |
1228 | size_t sz = 0; | |
1229 | uid_t nsid, hostid, range; | |
1230 | FILE *f = fopen("/proc/self/uid_map", "r"); | |
1231 | if (!f) | |
1232 | return 0; | |
1233 | ||
1234 | while (getline(&line, &sz, f) != -1) { | |
1235 | if (sscanf(line, "%u %u %u", &nsid, &hostid, &range) != 3) | |
1236 | continue; | |
1237 | if (hostid <= orig && hostid + range > orig) { | |
1238 | nsid += orig - hostid; | |
1239 | goto found; | |
1240 | } | |
1241 | } | |
1242 | ||
1243 | nsid = 0; | |
1244 | found: | |
1245 | fclose(f); | |
1246 | free(line); | |
1247 | return nsid; | |
1248 | } | |
c476bdce SH |
1249 | |
1250 | bool dir_exists(const char *path) | |
1251 | { | |
1252 | struct stat sb; | |
1253 | int ret; | |
1254 | ||
1255 | ret = stat(path, &sb); | |
1256 | if (ret < 0) | |
1257 | // could be something other than eexist, just say no | |
1258 | return false; | |
1259 | return S_ISDIR(sb.st_mode); | |
1260 | } | |
93c379f0 ÇO |
1261 | |
1262 | /* Note we don't use SHA-1 here as we don't want to depend on HAVE_GNUTLS. | |
1263 | * FNV has good anti collision properties and we're not worried | |
1264 | * about pre-image resistance or one-way-ness, we're just trying to make | |
1265 | * the name unique in the 108 bytes of space we have. | |
1266 | */ | |
1267 | uint64_t fnv_64a_buf(void *buf, size_t len, uint64_t hval) | |
1268 | { | |
1269 | unsigned char *bp; | |
1270 | ||
1271 | for(bp = buf; bp < (unsigned char *)buf + len; bp++) | |
1272 | { | |
1273 | /* xor the bottom with the current octet */ | |
1274 | hval ^= (uint64_t)*bp; | |
1275 | ||
1276 | /* gcc optimised: | |
1277 | * multiply by the 64 bit FNV magic prime mod 2^64 | |
1278 | */ | |
1279 | hval += (hval << 1) + (hval << 4) + (hval << 5) + | |
1280 | (hval << 7) + (hval << 8) + (hval << 40); | |
1281 | } | |
1282 | ||
1283 | return hval; | |
1284 | } | |
2c6f3fc9 SH |
1285 | |
1286 | /* | |
1287 | * Detect whether / is mounted MS_SHARED. The only way I know of to | |
1288 | * check that is through /proc/self/mountinfo. | |
1289 | * I'm only checking for /. If the container rootfs or mount location | |
1290 | * is MS_SHARED, but not '/', then you're out of luck - figuring that | |
1291 | * out would be too much work to be worth it. | |
1292 | */ | |
1293 | #define LINELEN 4096 | |
1294 | int detect_shared_rootfs(void) | |
1295 | { | |
1296 | char buf[LINELEN], *p; | |
1297 | FILE *f; | |
1298 | int i; | |
1299 | char *p2; | |
1300 | ||
1301 | f = fopen("/proc/self/mountinfo", "r"); | |
1302 | if (!f) | |
1303 | return 0; | |
1304 | while (fgets(buf, LINELEN, f)) { | |
1305 | for (p = buf, i=0; p && i < 4; i++) | |
b7f954bb | 1306 | p = strchr(p+1, ' '); |
2c6f3fc9 SH |
1307 | if (!p) |
1308 | continue; | |
b7f954bb | 1309 | p2 = strchr(p+1, ' '); |
2c6f3fc9 SH |
1310 | if (!p2) |
1311 | continue; | |
1312 | *p2 = '\0'; | |
1313 | if (strcmp(p+1, "/") == 0) { | |
1314 | // this is '/'. is it shared? | |
b7f954bb | 1315 | p = strchr(p2+1, ' '); |
2c6f3fc9 SH |
1316 | if (p && strstr(p, "shared:")) { |
1317 | fclose(f); | |
1318 | return 1; | |
1319 | } | |
1320 | } | |
1321 | } | |
1322 | fclose(f); | |
1323 | return 0; | |
1324 | } | |
0e6e3a41 | 1325 | |
51d0854c DY |
1326 | bool switch_to_ns(pid_t pid, const char *ns) { |
1327 | int fd, ret; | |
1328 | char nspath[MAXPATHLEN]; | |
1329 | ||
1330 | /* Switch to new ns */ | |
1331 | ret = snprintf(nspath, MAXPATHLEN, "/proc/%d/ns/%s", pid, ns); | |
1332 | if (ret < 0 || ret >= MAXPATHLEN) | |
1333 | return false; | |
1334 | ||
1335 | fd = open(nspath, O_RDONLY); | |
1336 | if (fd < 0) { | |
1337 | SYSERROR("failed to open %s", nspath); | |
1338 | return false; | |
1339 | } | |
1340 | ||
1341 | ret = setns(fd, 0); | |
1342 | if (ret) { | |
1343 | SYSERROR("failed to set process %d to %s of %d.", pid, ns, fd); | |
1344 | close(fd); | |
1345 | return false; | |
1346 | } | |
1347 | close(fd); | |
1348 | return true; | |
1349 | } | |
1350 | ||
b7f954bb SH |
1351 | /* |
1352 | * looking at fs/proc_namespace.c, it appears we can | |
1353 | * actually expect the rootfs entry to very specifically contain | |
1354 | * " - rootfs rootfs " | |
1355 | * IIUC, so long as we've chrooted so that rootfs is not our root, | |
1356 | * the rootfs entry should always be skipped in mountinfo contents. | |
1357 | */ | |
1358 | int detect_ramfs_rootfs(void) | |
1359 | { | |
1360 | char buf[LINELEN], *p; | |
1361 | FILE *f; | |
1362 | int i; | |
1363 | char *p2; | |
1364 | ||
1365 | f = fopen("/proc/self/mountinfo", "r"); | |
1366 | if (!f) | |
1367 | return 0; | |
1368 | while (fgets(buf, LINELEN, f)) { | |
1369 | for (p = buf, i=0; p && i < 4; i++) | |
1370 | p = strchr(p+1, ' '); | |
1371 | if (!p) | |
1372 | continue; | |
1373 | p2 = strchr(p+1, ' '); | |
1374 | if (!p2) | |
1375 | continue; | |
1376 | *p2 = '\0'; | |
1377 | if (strcmp(p+1, "/") == 0) { | |
1378 | // this is '/'. is it the ramfs? | |
1379 | p = strchr(p2+1, '-'); | |
1380 | if (p && strncmp(p, "- rootfs rootfs ", 16) == 0) { | |
1381 | fclose(f); | |
1382 | return 1; | |
1383 | } | |
1384 | } | |
1385 | } | |
1386 | fclose(f); | |
1387 | return 0; | |
1388 | } | |
1389 | ||
9d9c111c | 1390 | char *on_path(char *cmd, const char *rootfs) { |
0e6e3a41 SG |
1391 | char *path = NULL; |
1392 | char *entry = NULL; | |
1393 | char *saveptr = NULL; | |
1394 | char cmdpath[MAXPATHLEN]; | |
1395 | int ret; | |
1396 | ||
1397 | path = getenv("PATH"); | |
1398 | if (!path) | |
8afb3e61 | 1399 | return NULL; |
0e6e3a41 SG |
1400 | |
1401 | path = strdup(path); | |
1402 | if (!path) | |
8afb3e61 | 1403 | return NULL; |
0e6e3a41 SG |
1404 | |
1405 | entry = strtok_r(path, ":", &saveptr); | |
1406 | while (entry) { | |
9d9c111c SH |
1407 | if (rootfs) |
1408 | ret = snprintf(cmdpath, MAXPATHLEN, "%s/%s/%s", rootfs, entry, cmd); | |
1409 | else | |
1410 | ret = snprintf(cmdpath, MAXPATHLEN, "%s/%s", entry, cmd); | |
0e6e3a41 SG |
1411 | |
1412 | if (ret < 0 || ret >= MAXPATHLEN) | |
1413 | goto next_loop; | |
1414 | ||
1415 | if (access(cmdpath, X_OK) == 0) { | |
1416 | free(path); | |
8afb3e61 | 1417 | return strdup(cmdpath); |
0e6e3a41 SG |
1418 | } |
1419 | ||
1420 | next_loop: | |
b707e368 | 1421 | entry = strtok_r(NULL, ":", &saveptr); |
0e6e3a41 SG |
1422 | } |
1423 | ||
1424 | free(path); | |
8afb3e61 | 1425 | return NULL; |
0e6e3a41 | 1426 | } |
76a26f55 SH |
1427 | |
1428 | bool file_exists(const char *f) | |
1429 | { | |
1430 | struct stat statbuf; | |
1431 | ||
1432 | return stat(f, &statbuf) == 0; | |
1433 | } | |
9d9c111c SH |
1434 | |
1435 | /* historically lxc-init has been under /usr/lib/lxc and under | |
1436 | * /usr/lib/$ARCH/lxc. It now lives as $prefix/sbin/init.lxc. | |
1437 | */ | |
1438 | char *choose_init(const char *rootfs) | |
1439 | { | |
1440 | char *retv = NULL; | |
370ec268 SF |
1441 | const char *empty = "", |
1442 | *tmp; | |
9d9c111c SH |
1443 | int ret, env_set = 0; |
1444 | struct stat mystat; | |
1445 | ||
1446 | if (!getenv("PATH")) { | |
1447 | if (setenv("PATH", "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin", 0)) | |
1448 | SYSERROR("Failed to setenv"); | |
1449 | env_set = 1; | |
1450 | } | |
1451 | ||
1452 | retv = on_path("init.lxc", rootfs); | |
1453 | ||
1454 | if (env_set) { | |
1455 | if (unsetenv("PATH")) | |
1456 | SYSERROR("Failed to unsetenv"); | |
1457 | } | |
1458 | ||
1459 | if (retv) | |
1460 | return retv; | |
1461 | ||
1462 | retv = malloc(PATH_MAX); | |
1463 | if (!retv) | |
1464 | return NULL; | |
1465 | ||
1466 | if (rootfs) | |
370ec268 | 1467 | tmp = rootfs; |
9d9c111c | 1468 | else |
370ec268 SF |
1469 | tmp = empty; |
1470 | ||
1471 | ret = snprintf(retv, PATH_MAX, "%s/%s/%s", tmp, SBINDIR, "/init.lxc"); | |
9d9c111c SH |
1472 | if (ret < 0 || ret >= PATH_MAX) { |
1473 | ERROR("pathname too long"); | |
1474 | goto out1; | |
1475 | } | |
1476 | ||
1477 | ret = stat(retv, &mystat); | |
1478 | if (ret == 0) | |
1479 | return retv; | |
1480 | ||
370ec268 | 1481 | ret = snprintf(retv, PATH_MAX, "%s/%s/%s", tmp, LXCINITDIR, "/lxc/lxc-init"); |
9d9c111c SH |
1482 | if (ret < 0 || ret >= PATH_MAX) { |
1483 | ERROR("pathname too long"); | |
1484 | goto out1; | |
1485 | } | |
1486 | ||
1487 | ret = stat(retv, &mystat); | |
1488 | if (ret == 0) | |
1489 | return retv; | |
1490 | ||
370ec268 | 1491 | ret = snprintf(retv, PATH_MAX, "%s/usr/lib/lxc/lxc-init", tmp); |
9d9c111c SH |
1492 | if (ret < 0 || ret >= PATH_MAX) { |
1493 | ERROR("pathname too long"); | |
1494 | goto out1; | |
1495 | } | |
1496 | ret = stat(retv, &mystat); | |
1497 | if (ret == 0) | |
1498 | return retv; | |
1499 | ||
370ec268 | 1500 | ret = snprintf(retv, PATH_MAX, "%s/sbin/lxc-init", tmp); |
9d9c111c SH |
1501 | if (ret < 0 || ret >= PATH_MAX) { |
1502 | ERROR("pathname too long"); | |
1503 | goto out1; | |
1504 | } | |
1505 | ret = stat(retv, &mystat); | |
1506 | if (ret == 0) | |
1507 | return retv; | |
1508 | ||
1509 | /* | |
1510 | * Last resort, look for the statically compiled init.lxc which we | |
1511 | * hopefully bind-mounted in. | |
1512 | * If we are called during container setup, and we get to this point, | |
1513 | * then the init.lxc.static from the host will need to be bind-mounted | |
1514 | * in. So we return NULL here to indicate that. | |
1515 | */ | |
1516 | if (rootfs) | |
1517 | goto out1; | |
1518 | ||
1519 | ret = snprintf(retv, PATH_MAX, "/init.lxc.static"); | |
1520 | if (ret < 0 || ret >= PATH_MAX) { | |
1521 | WARN("Nonsense - name /lxc.init.static too long"); | |
1522 | goto out1; | |
1523 | } | |
1524 | ret = stat(retv, &mystat); | |
1525 | if (ret == 0) | |
1526 | return retv; | |
1527 | ||
1528 | out1: | |
1529 | free(retv); | |
1530 | return NULL; | |
1531 | } | |
735f2c6e TA |
1532 | |
1533 | int print_to_file(const char *file, const char *content) | |
1534 | { | |
1535 | FILE *f; | |
1536 | int ret = 0; | |
1537 | ||
1538 | f = fopen(file, "w"); | |
1539 | if (!f) | |
1540 | return -1; | |
1541 | if (fprintf(f, "%s", content) != strlen(content)) | |
1542 | ret = -1; | |
1543 | fclose(f); | |
1544 | return ret; | |
1545 | } | |
e1daebd9 SH |
1546 | |
1547 | int is_dir(const char *path) | |
1548 | { | |
1549 | struct stat statbuf; | |
1550 | int ret = stat(path, &statbuf); | |
1551 | if (ret == 0 && S_ISDIR(statbuf.st_mode)) | |
1552 | return 1; | |
1553 | return 0; | |
1554 | } | |
6010a416 SG |
1555 | |
1556 | /* | |
1557 | * Given the '-t' template option to lxc-create, figure out what to | |
1558 | * do. If the template is a full executable path, use that. If it | |
1559 | * is something like 'sshd', then return $templatepath/lxc-sshd. | |
1560 | * On success return the template, on error return NULL. | |
1561 | */ | |
1562 | char *get_template_path(const char *t) | |
1563 | { | |
1564 | int ret, len; | |
1565 | char *tpath; | |
1566 | ||
1567 | if (t[0] == '/' && access(t, X_OK) == 0) { | |
1568 | tpath = strdup(t); | |
1569 | return tpath; | |
1570 | } | |
1571 | ||
1572 | len = strlen(LXCTEMPLATEDIR) + strlen(t) + strlen("/lxc-") + 1; | |
1573 | tpath = malloc(len); | |
1574 | if (!tpath) | |
1575 | return NULL; | |
1576 | ret = snprintf(tpath, len, "%s/lxc-%s", LXCTEMPLATEDIR, t); | |
1577 | if (ret < 0 || ret >= len) { | |
1578 | free(tpath); | |
1579 | return NULL; | |
1580 | } | |
1581 | if (access(tpath, X_OK) < 0) { | |
1582 | SYSERROR("bad template: %s", t); | |
1583 | free(tpath); | |
1584 | return NULL; | |
1585 | } | |
1586 | ||
1587 | return tpath; | |
1588 | } | |
0a4be28d TA |
1589 | |
1590 | /* | |
1591 | * Sets the process title to the specified title. Note: | |
1592 | * 1. this function requires root to succeed | |
1593 | * 2. it clears /proc/self/environ | |
1594 | * 3. it may not succed (e.g. if title is longer than /proc/self/environ + | |
1595 | * the original title) | |
1596 | */ | |
1597 | int setproctitle(char *title) | |
1598 | { | |
1599 | char buf[2048], *tmp; | |
1600 | FILE *f; | |
1601 | int i, len, ret = 0; | |
1602 | unsigned long arg_start, arg_end, env_start, env_end; | |
1603 | ||
1604 | f = fopen_cloexec("/proc/self/stat", "r"); | |
1605 | if (!f) { | |
1606 | return -1; | |
1607 | } | |
1608 | ||
1609 | tmp = fgets(buf, sizeof(buf), f); | |
1610 | fclose(f); | |
1611 | if (!tmp) { | |
1612 | return -1; | |
1613 | } | |
1614 | ||
1615 | /* Skip the first 47 fields, column 48-51 are ARG_START and | |
1616 | * ARG_END. */ | |
1617 | tmp = strchr(buf, ' '); | |
1618 | for (i = 0; i < 46; i++) { | |
1619 | if (!tmp) | |
1620 | return -1; | |
1621 | tmp = strchr(tmp+1, ' '); | |
1622 | } | |
1623 | ||
73c1c887 SH |
1624 | if (!tmp) |
1625 | return -1; | |
1626 | ||
0a4be28d TA |
1627 | i = sscanf(tmp, "%lu %lu %lu %lu", &arg_start, &arg_end, &env_start, &env_end); |
1628 | if (i != 4) { | |
1629 | return -1; | |
1630 | } | |
1631 | ||
96fe6d1d TA |
1632 | /* Include the null byte here, because in the calculations below we |
1633 | * want to have room for it. */ | |
1634 | len = strlen(title) + 1; | |
1635 | ||
0a4be28d TA |
1636 | /* We're truncating the environment, so we should use at most the |
1637 | * length of the argument + environment for the title. */ | |
0a4be28d TA |
1638 | if (len > env_end - arg_start) { |
1639 | arg_end = env_end; | |
1640 | len = env_end - arg_start; | |
1641 | } else { | |
1642 | /* Only truncate the environment if we're actually going to | |
1643 | * overwrite part of it. */ | |
1644 | if (len >= arg_end - arg_start) { | |
1645 | env_start = env_end; | |
1646 | } | |
70642c33 | 1647 | |
69f97e3c TA |
1648 | arg_end = arg_start + len; |
1649 | ||
70642c33 | 1650 | /* check overflow */ |
69f97e3c | 1651 | if (arg_end < len || arg_end < arg_start) { |
70642c33 TA |
1652 | return -1; |
1653 | } | |
1654 | ||
0a4be28d TA |
1655 | } |
1656 | ||
96fe6d1d | 1657 | strcpy((char*)arg_start, title); |
0a4be28d | 1658 | |
70642c33 TA |
1659 | ret |= prctl(PR_SET_MM, PR_SET_MM_ARG_START, arg_start, 0, 0); |
1660 | ret |= prctl(PR_SET_MM, PR_SET_MM_ARG_END, arg_end, 0, 0); | |
1661 | ret |= prctl(PR_SET_MM, PR_SET_MM_ENV_START, env_start, 0, 0); | |
1662 | ret |= prctl(PR_SET_MM, PR_SET_MM_ENV_END, env_end, 0, 0); | |
0a4be28d TA |
1663 | |
1664 | return ret; | |
1665 | } |