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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 | ||
7935833c | 26 | #define __STDC_FORMAT_MACROS /* Required for PRIu64 to work. */ |
643c1984 | 27 | #include <ctype.h> |
a1e5280d | 28 | #include <dirent.h> |
e3642c43 | 29 | #include <errno.h> |
a1e5280d | 30 | #include <fcntl.h> |
dbaf55a3 | 31 | #include <grp.h> |
7935833c | 32 | #include <inttypes.h> |
a1e5280d | 33 | #include <libgen.h> |
b467714b | 34 | #include <pthread.h> |
d983b93c | 35 | #include <stddef.h> |
a1e5280d CB |
36 | #include <stdio.h> |
37 | #include <stdlib.h> | |
61a1d519 | 38 | #include <string.h> |
981f6029 | 39 | #include <unistd.h> |
e3642c43 | 40 | #include <sys/mman.h> |
6e4bb2e0 | 41 | #include <sys/mount.h> |
a1e5280d CB |
42 | #include <sys/param.h> |
43 | #include <sys/prctl.h> | |
44 | #include <sys/stat.h> | |
9be53773 SH |
45 | #include <sys/types.h> |
46 | #include <sys/wait.h> | |
e3642c43 DL |
47 | |
48 | #include "log.h" | |
025ed0f3 | 49 | #include "lxclock.h" |
51d0854c | 50 | #include "namespace.h" |
e3db0162 | 51 | #include "parse.h" |
981f6029 | 52 | #include "utils.h" |
e3642c43 | 53 | |
43f984ea DJ |
54 | #ifndef HAVE_STRLCPY |
55 | #include "include/strlcpy.h" | |
56 | #endif | |
57 | ||
bd583214 DJ |
58 | #ifndef HAVE_STRLCAT |
59 | #include "include/strlcat.h" | |
60 | #endif | |
61 | ||
4928c718 SG |
62 | #ifndef O_PATH |
63 | #define O_PATH 010000000 | |
64 | #endif | |
65 | ||
66 | #ifndef O_NOFOLLOW | |
67 | #define O_NOFOLLOW 00400000 | |
68 | #endif | |
69 | ||
ac2cecc4 | 70 | lxc_log_define(utils, lxc); |
e3642c43 | 71 | |
4295c5de SH |
72 | /* |
73 | * if path is btrfs, tries to remove it and any subvolumes beneath it | |
74 | */ | |
75 | extern bool btrfs_try_remove_subvol(const char *path); | |
76 | ||
41dc7155 | 77 | static int _recursive_rmdir(const char *dirname, dev_t pdev, |
0cc417b2 | 78 | const char *exclude, int level, bool onedev) |
60bf62d4 | 79 | { |
74f96976 | 80 | struct dirent *direntp; |
60bf62d4 SH |
81 | DIR *dir; |
82 | int ret, failed=0; | |
83 | char pathname[MAXPATHLEN]; | |
18aa217b | 84 | bool hadexclude = false; |
60bf62d4 SH |
85 | |
86 | dir = opendir(dirname); | |
87 | if (!dir) { | |
b103ceac | 88 | ERROR("failed to open %s", dirname); |
4355ab5f | 89 | return -1; |
60bf62d4 SH |
90 | } |
91 | ||
74f96976 | 92 | while ((direntp = readdir(dir))) { |
60bf62d4 SH |
93 | struct stat mystat; |
94 | int rc; | |
95 | ||
60bf62d4 SH |
96 | if (!strcmp(direntp->d_name, ".") || |
97 | !strcmp(direntp->d_name, "..")) | |
98 | continue; | |
99 | ||
100 | rc = snprintf(pathname, MAXPATHLEN, "%s/%s", dirname, direntp->d_name); | |
101 | if (rc < 0 || rc >= MAXPATHLEN) { | |
102 | ERROR("pathname too long"); | |
103 | failed=1; | |
104 | continue; | |
105 | } | |
18aa217b SH |
106 | |
107 | if (!level && exclude && !strcmp(direntp->d_name, exclude)) { | |
108 | ret = rmdir(pathname); | |
109 | if (ret < 0) { | |
110 | switch(errno) { | |
111 | case ENOTEMPTY: | |
0cc417b2 | 112 | INFO("Not deleting snapshot %s", pathname); |
18aa217b SH |
113 | hadexclude = true; |
114 | break; | |
115 | case ENOTDIR: | |
116 | ret = unlink(pathname); | |
117 | if (ret) | |
b103ceac | 118 | INFO("Failed to remove %s", pathname); |
18aa217b SH |
119 | break; |
120 | default: | |
b103ceac | 121 | SYSERROR("Failed to rmdir %s", pathname); |
18aa217b SH |
122 | failed = 1; |
123 | break; | |
124 | } | |
125 | } | |
126 | continue; | |
127 | } | |
128 | ||
60bf62d4 SH |
129 | ret = lstat(pathname, &mystat); |
130 | if (ret) { | |
b103ceac | 131 | ERROR("Failed to stat %s", pathname); |
4295c5de | 132 | failed = 1; |
60bf62d4 SH |
133 | continue; |
134 | } | |
b14fc100 | 135 | |
4295c5de SH |
136 | if (onedev && mystat.st_dev != pdev) { |
137 | /* TODO should we be checking /proc/self/mountinfo for | |
138 | * pathname and not doing this if found? */ | |
139 | if (btrfs_try_remove_subvol(pathname)) | |
140 | INFO("Removed btrfs subvolume at %s\n", pathname); | |
60bf62d4 | 141 | continue; |
4295c5de | 142 | } |
b14fc100 | 143 | |
60bf62d4 | 144 | if (S_ISDIR(mystat.st_mode)) { |
0cc417b2 | 145 | if (_recursive_rmdir(pathname, pdev, exclude, level+1, onedev) < 0) |
60bf62d4 SH |
146 | failed=1; |
147 | } else { | |
148 | if (unlink(pathname) < 0) { | |
b103ceac | 149 | SYSERROR("Failed to delete %s", pathname); |
60bf62d4 SH |
150 | failed=1; |
151 | } | |
152 | } | |
153 | } | |
154 | ||
4295c5de | 155 | if (rmdir(dirname) < 0 && !btrfs_try_remove_subvol(dirname) && !hadexclude) { |
b103ceac | 156 | ERROR("Failed to delete %s", dirname); |
4295c5de | 157 | failed=1; |
60bf62d4 SH |
158 | } |
159 | ||
025ed0f3 | 160 | ret = closedir(dir); |
025ed0f3 | 161 | if (ret) { |
b103ceac | 162 | ERROR("Failed to close directory %s", dirname); |
60bf62d4 SH |
163 | failed=1; |
164 | } | |
165 | ||
4355ab5f | 166 | return failed ? -1 : 0; |
60bf62d4 SH |
167 | } |
168 | ||
29a11a7f CB |
169 | /* In overlayfs, st_dev is unreliable. So on overlayfs we don't do the |
170 | * lxc_rmdir_onedev() | |
0cc417b2 SH |
171 | */ |
172 | static bool is_native_overlayfs(const char *path) | |
173 | { | |
29a11a7f CB |
174 | if (has_fs_type(path, OVERLAY_SUPER_MAGIC) || |
175 | has_fs_type(path, OVERLAYFS_SUPER_MAGIC)) | |
0cc417b2 | 176 | return true; |
29a11a7f | 177 | |
0cc417b2 SH |
178 | return false; |
179 | } | |
180 | ||
4355ab5f | 181 | /* returns 0 on success, -1 if there were any failures */ |
41dc7155 | 182 | extern int lxc_rmdir_onedev(const char *path, const char *exclude) |
60bf62d4 SH |
183 | { |
184 | struct stat mystat; | |
0cc417b2 SH |
185 | bool onedev = true; |
186 | ||
41dc7155 | 187 | if (is_native_overlayfs(path)) |
0cc417b2 | 188 | onedev = false; |
60bf62d4 SH |
189 | |
190 | if (lstat(path, &mystat) < 0) { | |
067650d0 SH |
191 | if (errno == ENOENT) |
192 | return 0; | |
41dc7155 | 193 | |
b103ceac | 194 | ERROR("Failed to stat %s", path); |
4355ab5f | 195 | return -1; |
60bf62d4 SH |
196 | } |
197 | ||
0cc417b2 | 198 | return _recursive_rmdir(path, mystat.st_dev, exclude, 0, onedev); |
60bf62d4 SH |
199 | } |
200 | ||
9ddaf3bf | 201 | /* borrowed from iproute2 */ |
7c11d57a | 202 | extern int get_u16(unsigned short *val, const char *arg, int base) |
9ddaf3bf JHS |
203 | { |
204 | unsigned long res; | |
205 | char *ptr; | |
206 | ||
207 | if (!arg || !*arg) | |
208 | return -1; | |
209 | ||
09bbd745 | 210 | errno = 0; |
9ddaf3bf | 211 | res = strtoul(arg, &ptr, base); |
09bbd745 | 212 | if (!ptr || ptr == arg || *ptr || res > 0xFFFF || errno != 0) |
9ddaf3bf JHS |
213 | return -1; |
214 | ||
215 | *val = res; | |
216 | ||
217 | return 0; | |
218 | } | |
219 | ||
3ce74686 | 220 | extern int mkdir_p(const char *dir, mode_t mode) |
1b09f2c0 | 221 | { |
3ce74686 SH |
222 | const char *tmp = dir; |
223 | const char *orig = dir; | |
860fc865 RW |
224 | char *makeme; |
225 | ||
226 | do { | |
227 | dir = tmp + strspn(tmp, "/"); | |
228 | tmp = dir + strcspn(dir, "/"); | |
b14fc100 | 229 | |
d74325c4 | 230 | makeme = strndup(orig, dir - orig); |
860fc865 RW |
231 | if (*makeme) { |
232 | if (mkdir(makeme, mode) && errno != EEXIST) { | |
959aee9c | 233 | SYSERROR("failed to create directory '%s'", makeme); |
d74325c4 | 234 | free(makeme); |
860fc865 RW |
235 | return -1; |
236 | } | |
237 | } | |
d74325c4 | 238 | free(makeme); |
860fc865 | 239 | } while(tmp != dir); |
1b09f2c0 | 240 | |
98663823 | 241 | return 0; |
1b09f2c0 | 242 | } |
2a59a681 | 243 | |
44b9ae4b | 244 | char *get_rundir() |
9e60f51d | 245 | { |
97a696c6 SG |
246 | char *rundir; |
247 | const char *homedir; | |
9650c735 | 248 | struct stat sb; |
9e60f51d | 249 | |
b14fc100 | 250 | if (stat(RUNTIME_PATH, &sb) < 0) |
9650c735 | 251 | return NULL; |
9650c735 TA |
252 | |
253 | if (geteuid() == sb.st_uid || getegid() == sb.st_gid) { | |
c580b8d2 | 254 | rundir = strdup(RUNTIME_PATH); |
d6470e71 SG |
255 | return rundir; |
256 | } | |
97a696c6 SG |
257 | |
258 | rundir = getenv("XDG_RUNTIME_DIR"); | |
44b9ae4b SG |
259 | if (rundir) { |
260 | rundir = strdup(rundir); | |
261 | return rundir; | |
262 | } | |
97a696c6 | 263 | |
44b9ae4b SG |
264 | INFO("XDG_RUNTIME_DIR isn't set in the environment."); |
265 | homedir = getenv("HOME"); | |
266 | if (!homedir) { | |
267 | ERROR("HOME isn't set in the environment."); | |
268 | return NULL; | |
97a696c6 SG |
269 | } |
270 | ||
44b9ae4b | 271 | rundir = malloc(sizeof(char) * (17 + strlen(homedir))); |
b14fc100 | 272 | if (!rundir) |
273 | return NULL; | |
274 | ||
44b9ae4b SG |
275 | sprintf(rundir, "%s/.cache/lxc/run/", homedir); |
276 | ||
9e60f51d DE |
277 | return rundir; |
278 | } | |
279 | ||
9be53773 SH |
280 | int wait_for_pid(pid_t pid) |
281 | { | |
282 | int status, ret; | |
283 | ||
284 | again: | |
285 | ret = waitpid(pid, &status, 0); | |
286 | if (ret == -1) { | |
71b9b8ed | 287 | if (errno == EINTR) |
9be53773 | 288 | goto again; |
b14fc100 | 289 | |
9be53773 SH |
290 | return -1; |
291 | } | |
b14fc100 | 292 | |
9be53773 SH |
293 | if (ret != pid) |
294 | goto again; | |
b14fc100 | 295 | |
9be53773 SH |
296 | if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) |
297 | return -1; | |
b14fc100 | 298 | |
9be53773 SH |
299 | return 0; |
300 | } | |
c797a220 CS |
301 | |
302 | int lxc_wait_for_pid_status(pid_t pid) | |
303 | { | |
304 | int status, ret; | |
305 | ||
306 | again: | |
307 | ret = waitpid(pid, &status, 0); | |
308 | if (ret == -1) { | |
309 | if (errno == EINTR) | |
310 | goto again; | |
b14fc100 | 311 | |
c797a220 CS |
312 | return -1; |
313 | } | |
b14fc100 | 314 | |
c797a220 CS |
315 | if (ret != pid) |
316 | goto again; | |
b14fc100 | 317 | |
c797a220 CS |
318 | return status; |
319 | } | |
92f023dc | 320 | |
3ce74686 SH |
321 | #if HAVE_LIBGNUTLS |
322 | #include <gnutls/gnutls.h> | |
323 | #include <gnutls/crypto.h> | |
41246cee DE |
324 | |
325 | __attribute__((constructor)) | |
326 | static void gnutls_lxc_init(void) | |
327 | { | |
328 | gnutls_global_init(); | |
329 | } | |
330 | ||
3ce74686 SH |
331 | int sha1sum_file(char *fnam, unsigned char *digest) |
332 | { | |
333 | char *buf; | |
334 | int ret; | |
335 | FILE *f; | |
336 | long flen; | |
337 | ||
338 | if (!fnam) | |
339 | return -1; | |
b14fc100 | 340 | |
025ed0f3 | 341 | f = fopen_cloexec(fnam, "r"); |
7be677a8 | 342 | if (!f) { |
3ce74686 SH |
343 | SYSERROR("Error opening template"); |
344 | return -1; | |
345 | } | |
b14fc100 | 346 | |
3ce74686 SH |
347 | if (fseek(f, 0, SEEK_END) < 0) { |
348 | SYSERROR("Error seeking to end of template"); | |
dd1d77f9 | 349 | fclose(f); |
3ce74686 SH |
350 | return -1; |
351 | } | |
b14fc100 | 352 | |
3ce74686 SH |
353 | if ((flen = ftell(f)) < 0) { |
354 | SYSERROR("Error telling size of template"); | |
dd1d77f9 | 355 | fclose(f); |
3ce74686 SH |
356 | return -1; |
357 | } | |
b14fc100 | 358 | |
3ce74686 SH |
359 | if (fseek(f, 0, SEEK_SET) < 0) { |
360 | SYSERROR("Error seeking to start of template"); | |
dd1d77f9 | 361 | fclose(f); |
3ce74686 SH |
362 | return -1; |
363 | } | |
b14fc100 | 364 | |
3ce74686 SH |
365 | if ((buf = malloc(flen+1)) == NULL) { |
366 | SYSERROR("Out of memory"); | |
dd1d77f9 | 367 | fclose(f); |
3ce74686 SH |
368 | return -1; |
369 | } | |
b14fc100 | 370 | |
3ce74686 SH |
371 | if (fread(buf, 1, flen, f) != flen) { |
372 | SYSERROR("Failure reading template"); | |
373 | free(buf); | |
dd1d77f9 | 374 | fclose(f); |
3ce74686 SH |
375 | return -1; |
376 | } | |
b14fc100 | 377 | |
dd1d77f9 | 378 | if (fclose(f) < 0) { |
3ce74686 SH |
379 | SYSERROR("Failre closing template"); |
380 | free(buf); | |
381 | return -1; | |
382 | } | |
b14fc100 | 383 | |
3ce74686 SH |
384 | buf[flen] = '\0'; |
385 | ret = gnutls_hash_fast(GNUTLS_DIG_SHA1, buf, flen, (void *)digest); | |
386 | free(buf); | |
387 | return ret; | |
388 | } | |
389 | #endif | |
61a1d519 | 390 | |
8bd8018e | 391 | struct lxc_popen_FILE *lxc_popen(const char *command) |
ebec9176 | 392 | { |
3f323207 | 393 | int ret; |
ebec9176 AM |
394 | int pipe_fds[2]; |
395 | pid_t child_pid; | |
8bd8018e | 396 | struct lxc_popen_FILE *fp = NULL; |
ebec9176 | 397 | |
8bd8018e CB |
398 | ret = pipe2(pipe_fds, O_CLOEXEC); |
399 | if (ret < 0) | |
ebec9176 | 400 | return NULL; |
ebec9176 AM |
401 | |
402 | child_pid = fork(); | |
8bd8018e CB |
403 | if (child_pid < 0) |
404 | goto on_error; | |
405 | ||
406 | if (!child_pid) { | |
407 | sigset_t mask; | |
408 | ||
409 | close(pipe_fds[0]); | |
410 | ||
411 | /* duplicate stdout */ | |
412 | if (pipe_fds[1] != STDOUT_FILENO) | |
413 | ret = dup2(pipe_fds[1], STDOUT_FILENO); | |
414 | else | |
415 | ret = fcntl(pipe_fds[1], F_SETFD, 0); | |
416 | if (ret < 0) { | |
417 | close(pipe_fds[1]); | |
03f618af | 418 | _exit(EXIT_FAILURE); |
3f323207 CB |
419 | } |
420 | ||
8bd8018e CB |
421 | /* duplicate stderr */ |
422 | if (pipe_fds[1] != STDERR_FILENO) | |
423 | ret = dup2(pipe_fds[1], STDERR_FILENO); | |
424 | else | |
425 | ret = fcntl(pipe_fds[1], F_SETFD, 0); | |
426 | close(pipe_fds[1]); | |
427 | if (ret < 0) | |
03f618af | 428 | _exit(EXIT_FAILURE); |
8bd8018e CB |
429 | |
430 | /* unblock all signals */ | |
431 | ret = sigfillset(&mask); | |
432 | if (ret < 0) | |
03f618af | 433 | _exit(EXIT_FAILURE); |
8bd8018e | 434 | |
b467714b | 435 | ret = pthread_sigmask(SIG_UNBLOCK, &mask, NULL); |
8bd8018e | 436 | if (ret < 0) |
03f618af | 437 | _exit(EXIT_FAILURE); |
8bd8018e CB |
438 | |
439 | execl("/bin/sh", "sh", "-c", command, (char *)NULL); | |
03f618af | 440 | _exit(127); |
ebec9176 AM |
441 | } |
442 | ||
8bd8018e CB |
443 | close(pipe_fds[1]); |
444 | pipe_fds[1] = -1; | |
ebec9176 | 445 | |
8bd8018e CB |
446 | fp = malloc(sizeof(*fp)); |
447 | if (!fp) | |
448 | goto on_error; | |
b14fc100 | 449 | |
7e50ec0b | 450 | memset(fp, 0, sizeof(*fp)); |
ebec9176 AM |
451 | |
452 | fp->child_pid = child_pid; | |
8bd8018e | 453 | fp->pipe = pipe_fds[0]; |
ebec9176 | 454 | |
7e50ec0b CB |
455 | /* From now on, closing fp->f will also close fp->pipe. So only ever |
456 | * call fclose(fp->f). | |
457 | */ | |
8bd8018e CB |
458 | fp->f = fdopen(pipe_fds[0], "r"); |
459 | if (!fp->f) | |
460 | goto on_error; | |
ebec9176 | 461 | |
8bd8018e | 462 | return fp; |
ebec9176 | 463 | |
8bd8018e | 464 | on_error: |
7e50ec0b CB |
465 | /* We can only close pipe_fds[0] if fdopen() didn't succeed or wasn't |
466 | * called yet. Otherwise the fd belongs to the file opened by fdopen() | |
467 | * since it isn't dup()ed. | |
468 | */ | |
469 | if (fp && !fp->f && pipe_fds[0] >= 0) | |
8bd8018e CB |
470 | close(pipe_fds[0]); |
471 | ||
472 | if (pipe_fds[1] >= 0) | |
473 | close(pipe_fds[1]); | |
ebec9176 | 474 | |
7e50ec0b CB |
475 | if (fp && fp->f) |
476 | fclose(fp->f); | |
477 | ||
478 | if (fp) | |
479 | free(fp); | |
480 | ||
ebec9176 AM |
481 | return NULL; |
482 | } | |
483 | ||
8bd8018e | 484 | int lxc_pclose(struct lxc_popen_FILE *fp) |
ebec9176 | 485 | { |
ebec9176 | 486 | pid_t wait_pid; |
8bd8018e | 487 | int wstatus = 0; |
ebec9176 | 488 | |
8bd8018e | 489 | if (!fp) |
ebec9176 | 490 | return -1; |
ebec9176 AM |
491 | |
492 | do { | |
8bd8018e CB |
493 | wait_pid = waitpid(fp->child_pid, &wstatus, 0); |
494 | } while (wait_pid < 0 && errno == EINTR); | |
ebec9176 | 495 | |
8bd8018e CB |
496 | fclose(fp->f); |
497 | free(fp); | |
498 | ||
499 | if (wait_pid < 0) | |
ebec9176 | 500 | return -1; |
ebec9176 AM |
501 | |
502 | return wstatus; | |
503 | } | |
504 | ||
508c263e SH |
505 | int randseed(bool srand_it) |
506 | { | |
507 | /* | |
508 | srand pre-seed function based on /dev/urandom | |
509 | */ | |
091045f8 | 510 | unsigned int seed = time(NULL) + getpid(); |
508c263e SH |
511 | |
512 | FILE *f; | |
513 | f = fopen("/dev/urandom", "r"); | |
514 | if (f) { | |
515 | int ret = fread(&seed, sizeof(seed), 1, f); | |
516 | if (ret != 1) | |
7874d81a | 517 | SYSDEBUG("unable to fread /dev/urandom, fallback to time+pid rand seed"); |
518 | ||
508c263e SH |
519 | fclose(f); |
520 | } | |
521 | ||
522 | if (srand_it) | |
523 | srand(seed); | |
524 | ||
525 | return seed; | |
526 | } | |
5d897655 SH |
527 | |
528 | uid_t get_ns_uid(uid_t orig) | |
529 | { | |
530 | char *line = NULL; | |
531 | size_t sz = 0; | |
532 | uid_t nsid, hostid, range; | |
533 | FILE *f = fopen("/proc/self/uid_map", "r"); | |
534 | if (!f) | |
535 | return 0; | |
536 | ||
537 | while (getline(&line, &sz, f) != -1) { | |
538 | if (sscanf(line, "%u %u %u", &nsid, &hostid, &range) != 3) | |
539 | continue; | |
b14fc100 | 540 | |
5d897655 SH |
541 | if (hostid <= orig && hostid + range > orig) { |
542 | nsid += orig - hostid; | |
543 | goto found; | |
544 | } | |
545 | } | |
546 | ||
b962868f CB |
547 | nsid = LXC_INVALID_UID; |
548 | ||
549 | found: | |
550 | fclose(f); | |
551 | free(line); | |
552 | return nsid; | |
553 | } | |
554 | ||
555 | gid_t get_ns_gid(gid_t orig) | |
556 | { | |
557 | char *line = NULL; | |
558 | size_t sz = 0; | |
559 | gid_t nsid, hostid, range; | |
560 | FILE *f = fopen("/proc/self/gid_map", "r"); | |
561 | if (!f) | |
562 | return 0; | |
563 | ||
564 | while (getline(&line, &sz, f) != -1) { | |
565 | if (sscanf(line, "%u %u %u", &nsid, &hostid, &range) != 3) | |
566 | continue; | |
567 | ||
568 | if (hostid <= orig && hostid + range > orig) { | |
569 | nsid += orig - hostid; | |
570 | goto found; | |
571 | } | |
572 | } | |
573 | ||
574 | nsid = LXC_INVALID_GID; | |
b14fc100 | 575 | |
5d897655 SH |
576 | found: |
577 | fclose(f); | |
578 | free(line); | |
579 | return nsid; | |
580 | } | |
c476bdce SH |
581 | |
582 | bool dir_exists(const char *path) | |
583 | { | |
584 | struct stat sb; | |
585 | int ret; | |
586 | ||
587 | ret = stat(path, &sb); | |
588 | if (ret < 0) | |
1a0e70ac | 589 | /* Could be something other than eexist, just say "no". */ |
c476bdce | 590 | return false; |
b14fc100 | 591 | |
c476bdce SH |
592 | return S_ISDIR(sb.st_mode); |
593 | } | |
93c379f0 ÇO |
594 | |
595 | /* Note we don't use SHA-1 here as we don't want to depend on HAVE_GNUTLS. | |
596 | * FNV has good anti collision properties and we're not worried | |
597 | * about pre-image resistance or one-way-ness, we're just trying to make | |
598 | * the name unique in the 108 bytes of space we have. | |
599 | */ | |
600 | uint64_t fnv_64a_buf(void *buf, size_t len, uint64_t hval) | |
601 | { | |
602 | unsigned char *bp; | |
603 | ||
604 | for(bp = buf; bp < (unsigned char *)buf + len; bp++) | |
605 | { | |
606 | /* xor the bottom with the current octet */ | |
607 | hval ^= (uint64_t)*bp; | |
608 | ||
609 | /* gcc optimised: | |
610 | * multiply by the 64 bit FNV magic prime mod 2^64 | |
611 | */ | |
612 | hval += (hval << 1) + (hval << 4) + (hval << 5) + | |
613 | (hval << 7) + (hval << 8) + (hval << 40); | |
614 | } | |
615 | ||
616 | return hval; | |
617 | } | |
2c6f3fc9 | 618 | |
f6310f18 | 619 | bool is_shared_mountpoint(const char *path) |
2c6f3fc9 | 620 | { |
f6310f18 | 621 | char buf[LXC_LINELEN]; |
2c6f3fc9 SH |
622 | FILE *f; |
623 | int i; | |
f6310f18 | 624 | char *p, *p2; |
2c6f3fc9 SH |
625 | |
626 | f = fopen("/proc/self/mountinfo", "r"); | |
627 | if (!f) | |
628 | return 0; | |
b14fc100 | 629 | |
eab15c1e CB |
630 | while (fgets(buf, LXC_LINELEN, f)) { |
631 | for (p = buf, i = 0; p && i < 4; i++) | |
632 | p = strchr(p + 1, ' '); | |
2c6f3fc9 SH |
633 | if (!p) |
634 | continue; | |
b14fc100 | 635 | |
eab15c1e | 636 | p2 = strchr(p + 1, ' '); |
2c6f3fc9 SH |
637 | if (!p2) |
638 | continue; | |
b14fc100 | 639 | |
2c6f3fc9 | 640 | *p2 = '\0'; |
f6310f18 LT |
641 | if (strcmp(p + 1, path) == 0) { |
642 | /* This is the path. Is it shared? */ | |
eab15c1e | 643 | p = strchr(p2 + 1, ' '); |
2c6f3fc9 SH |
644 | if (p && strstr(p, "shared:")) { |
645 | fclose(f); | |
f6310f18 | 646 | return true; |
2c6f3fc9 SH |
647 | } |
648 | } | |
649 | } | |
b14fc100 | 650 | |
2c6f3fc9 | 651 | fclose(f); |
f6310f18 LT |
652 | return false; |
653 | } | |
654 | ||
655 | /* | |
656 | * Detect whether / is mounted MS_SHARED. The only way I know of to | |
657 | * check that is through /proc/self/mountinfo. | |
658 | * I'm only checking for /. If the container rootfs or mount location | |
659 | * is MS_SHARED, but not '/', then you're out of luck - figuring that | |
660 | * out would be too much work to be worth it. | |
661 | */ | |
662 | int detect_shared_rootfs(void) | |
663 | { | |
664 | if (is_shared_mountpoint("/")) | |
665 | return 1; | |
2c6f3fc9 SH |
666 | return 0; |
667 | } | |
0e6e3a41 | 668 | |
37ef15bb CB |
669 | bool switch_to_ns(pid_t pid, const char *ns) |
670 | { | |
51d0854c DY |
671 | int fd, ret; |
672 | char nspath[MAXPATHLEN]; | |
673 | ||
674 | /* Switch to new ns */ | |
675 | ret = snprintf(nspath, MAXPATHLEN, "/proc/%d/ns/%s", pid, ns); | |
676 | if (ret < 0 || ret >= MAXPATHLEN) | |
677 | return false; | |
678 | ||
679 | fd = open(nspath, O_RDONLY); | |
680 | if (fd < 0) { | |
a9cb0fb8 | 681 | SYSERROR("Failed to open %s", nspath); |
51d0854c DY |
682 | return false; |
683 | } | |
684 | ||
685 | ret = setns(fd, 0); | |
686 | if (ret) { | |
a9cb0fb8 | 687 | SYSERROR("Failed to set process %d to %s of %d.", pid, ns, fd); |
51d0854c DY |
688 | close(fd); |
689 | return false; | |
690 | } | |
b14fc100 | 691 | |
51d0854c DY |
692 | close(fd); |
693 | return true; | |
694 | } | |
695 | ||
b7f954bb SH |
696 | /* |
697 | * looking at fs/proc_namespace.c, it appears we can | |
698 | * actually expect the rootfs entry to very specifically contain | |
699 | * " - rootfs rootfs " | |
700 | * IIUC, so long as we've chrooted so that rootfs is not our root, | |
701 | * the rootfs entry should always be skipped in mountinfo contents. | |
702 | */ | |
fa454c8e | 703 | bool detect_ramfs_rootfs(void) |
b7f954bb | 704 | { |
b7f954bb | 705 | FILE *f; |
fa454c8e CB |
706 | char *p, *p2; |
707 | char *line = NULL; | |
708 | size_t len = 0; | |
b7f954bb | 709 | int i; |
b7f954bb SH |
710 | |
711 | f = fopen("/proc/self/mountinfo", "r"); | |
712 | if (!f) | |
fa454c8e CB |
713 | return false; |
714 | ||
715 | while (getline(&line, &len, f) != -1) { | |
716 | for (p = line, i = 0; p && i < 4; i++) | |
717 | p = strchr(p + 1, ' '); | |
b7f954bb SH |
718 | if (!p) |
719 | continue; | |
b14fc100 | 720 | |
fa454c8e | 721 | p2 = strchr(p + 1, ' '); |
b7f954bb SH |
722 | if (!p2) |
723 | continue; | |
b14fc100 | 724 | |
b7f954bb | 725 | *p2 = '\0'; |
fa454c8e | 726 | if (strcmp(p + 1, "/") == 0) { |
1a0e70ac | 727 | /* This is '/'. Is it the ramfs? */ |
fa454c8e | 728 | p = strchr(p2 + 1, '-'); |
b7f954bb | 729 | if (p && strncmp(p, "- rootfs rootfs ", 16) == 0) { |
fa454c8e | 730 | free(line); |
b7f954bb | 731 | fclose(f); |
8ce1abc2 | 732 | INFO("Rootfs is located on ramfs"); |
fa454c8e | 733 | return true; |
b7f954bb SH |
734 | } |
735 | } | |
736 | } | |
b14fc100 | 737 | |
fa454c8e | 738 | free(line); |
b7f954bb | 739 | fclose(f); |
fa454c8e | 740 | return false; |
b7f954bb SH |
741 | } |
742 | ||
37ef15bb CB |
743 | char *on_path(const char *cmd, const char *rootfs) |
744 | { | |
84c5549b | 745 | char *entry = NULL, *path = NULL; |
0e6e3a41 SG |
746 | char cmdpath[MAXPATHLEN]; |
747 | int ret; | |
748 | ||
749 | path = getenv("PATH"); | |
750 | if (!path) | |
8afb3e61 | 751 | return NULL; |
0e6e3a41 SG |
752 | |
753 | path = strdup(path); | |
754 | if (!path) | |
8afb3e61 | 755 | return NULL; |
0e6e3a41 | 756 | |
37ef15bb | 757 | lxc_iterate_parts (entry, path, ":") { |
9d9c111c | 758 | if (rootfs) |
37ef15bb CB |
759 | ret = snprintf(cmdpath, MAXPATHLEN, "%s/%s/%s", rootfs, |
760 | entry, cmd); | |
9d9c111c SH |
761 | else |
762 | ret = snprintf(cmdpath, MAXPATHLEN, "%s/%s", entry, cmd); | |
0e6e3a41 | 763 | if (ret < 0 || ret >= MAXPATHLEN) |
84c5549b | 764 | continue; |
0e6e3a41 SG |
765 | |
766 | if (access(cmdpath, X_OK) == 0) { | |
767 | free(path); | |
8afb3e61 | 768 | return strdup(cmdpath); |
0e6e3a41 | 769 | } |
0e6e3a41 SG |
770 | } |
771 | ||
772 | free(path); | |
8afb3e61 | 773 | return NULL; |
0e6e3a41 | 774 | } |
76a26f55 | 775 | |
12983ba4 SH |
776 | bool cgns_supported(void) |
777 | { | |
778 | return file_exists("/proc/self/ns/cgroup"); | |
779 | } | |
780 | ||
9d9c111c SH |
781 | /* historically lxc-init has been under /usr/lib/lxc and under |
782 | * /usr/lib/$ARCH/lxc. It now lives as $prefix/sbin/init.lxc. | |
783 | */ | |
784 | char *choose_init(const char *rootfs) | |
785 | { | |
786 | char *retv = NULL; | |
370ec268 SF |
787 | const char *empty = "", |
788 | *tmp; | |
9d9c111c | 789 | int ret, env_set = 0; |
9d9c111c SH |
790 | |
791 | if (!getenv("PATH")) { | |
792 | if (setenv("PATH", "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin", 0)) | |
793 | SYSERROR("Failed to setenv"); | |
b14fc100 | 794 | |
9d9c111c SH |
795 | env_set = 1; |
796 | } | |
797 | ||
798 | retv = on_path("init.lxc", rootfs); | |
799 | ||
800 | if (env_set) { | |
801 | if (unsetenv("PATH")) | |
802 | SYSERROR("Failed to unsetenv"); | |
803 | } | |
804 | ||
805 | if (retv) | |
806 | return retv; | |
807 | ||
808 | retv = malloc(PATH_MAX); | |
809 | if (!retv) | |
810 | return NULL; | |
811 | ||
812 | if (rootfs) | |
370ec268 | 813 | tmp = rootfs; |
9d9c111c | 814 | else |
370ec268 SF |
815 | tmp = empty; |
816 | ||
817 | ret = snprintf(retv, PATH_MAX, "%s/%s/%s", tmp, SBINDIR, "/init.lxc"); | |
9d9c111c SH |
818 | if (ret < 0 || ret >= PATH_MAX) { |
819 | ERROR("pathname too long"); | |
820 | goto out1; | |
821 | } | |
b14fc100 | 822 | |
e57cd7e9 | 823 | if (access(retv, X_OK) == 0) |
9d9c111c SH |
824 | return retv; |
825 | ||
370ec268 | 826 | ret = snprintf(retv, PATH_MAX, "%s/%s/%s", tmp, LXCINITDIR, "/lxc/lxc-init"); |
9d9c111c SH |
827 | if (ret < 0 || ret >= PATH_MAX) { |
828 | ERROR("pathname too long"); | |
829 | goto out1; | |
830 | } | |
b14fc100 | 831 | |
e57cd7e9 | 832 | if (access(retv, X_OK) == 0) |
9d9c111c SH |
833 | return retv; |
834 | ||
370ec268 | 835 | ret = snprintf(retv, PATH_MAX, "%s/usr/lib/lxc/lxc-init", tmp); |
9d9c111c SH |
836 | if (ret < 0 || ret >= PATH_MAX) { |
837 | ERROR("pathname too long"); | |
838 | goto out1; | |
839 | } | |
b14fc100 | 840 | |
e57cd7e9 | 841 | if (access(retv, X_OK) == 0) |
9d9c111c SH |
842 | return retv; |
843 | ||
370ec268 | 844 | ret = snprintf(retv, PATH_MAX, "%s/sbin/lxc-init", tmp); |
9d9c111c SH |
845 | if (ret < 0 || ret >= PATH_MAX) { |
846 | ERROR("pathname too long"); | |
847 | goto out1; | |
848 | } | |
b14fc100 | 849 | |
e57cd7e9 | 850 | if (access(retv, X_OK) == 0) |
9d9c111c SH |
851 | return retv; |
852 | ||
853 | /* | |
854 | * Last resort, look for the statically compiled init.lxc which we | |
855 | * hopefully bind-mounted in. | |
856 | * If we are called during container setup, and we get to this point, | |
857 | * then the init.lxc.static from the host will need to be bind-mounted | |
858 | * in. So we return NULL here to indicate that. | |
859 | */ | |
860 | if (rootfs) | |
861 | goto out1; | |
862 | ||
863 | ret = snprintf(retv, PATH_MAX, "/init.lxc.static"); | |
864 | if (ret < 0 || ret >= PATH_MAX) { | |
865 | WARN("Nonsense - name /lxc.init.static too long"); | |
866 | goto out1; | |
867 | } | |
b14fc100 | 868 | |
e57cd7e9 | 869 | if (access(retv, X_OK) == 0) |
9d9c111c SH |
870 | return retv; |
871 | ||
872 | out1: | |
873 | free(retv); | |
874 | return NULL; | |
875 | } | |
735f2c6e | 876 | |
6010a416 SG |
877 | /* |
878 | * Given the '-t' template option to lxc-create, figure out what to | |
879 | * do. If the template is a full executable path, use that. If it | |
880 | * is something like 'sshd', then return $templatepath/lxc-sshd. | |
881 | * On success return the template, on error return NULL. | |
882 | */ | |
883 | char *get_template_path(const char *t) | |
884 | { | |
885 | int ret, len; | |
886 | char *tpath; | |
887 | ||
888 | if (t[0] == '/' && access(t, X_OK) == 0) { | |
889 | tpath = strdup(t); | |
890 | return tpath; | |
891 | } | |
892 | ||
893 | len = strlen(LXCTEMPLATEDIR) + strlen(t) + strlen("/lxc-") + 1; | |
b14fc100 | 894 | |
6010a416 SG |
895 | tpath = malloc(len); |
896 | if (!tpath) | |
897 | return NULL; | |
b14fc100 | 898 | |
6010a416 SG |
899 | ret = snprintf(tpath, len, "%s/lxc-%s", LXCTEMPLATEDIR, t); |
900 | if (ret < 0 || ret >= len) { | |
901 | free(tpath); | |
902 | return NULL; | |
903 | } | |
b14fc100 | 904 | |
6010a416 SG |
905 | if (access(tpath, X_OK) < 0) { |
906 | SYSERROR("bad template: %s", t); | |
907 | free(tpath); | |
908 | return NULL; | |
909 | } | |
910 | ||
911 | return tpath; | |
912 | } | |
0a4be28d | 913 | |
592fd47a SH |
914 | /* |
915 | * @path: a pathname where / replaced with '\0'. | |
916 | * @offsetp: pointer to int showing which path segment was last seen. | |
917 | * Updated on return to reflect the next segment. | |
918 | * @fulllen: full original path length. | |
919 | * Returns a pointer to the next path segment, or NULL if done. | |
920 | */ | |
921 | static char *get_nextpath(char *path, int *offsetp, int fulllen) | |
922 | { | |
923 | int offset = *offsetp; | |
924 | ||
925 | if (offset >= fulllen) | |
926 | return NULL; | |
927 | ||
91d9cab6 | 928 | while (offset < fulllen && path[offset] != '\0') |
592fd47a | 929 | offset++; |
b14fc100 | 930 | |
91d9cab6 | 931 | while (offset < fulllen && path[offset] == '\0') |
592fd47a SH |
932 | offset++; |
933 | ||
934 | *offsetp = offset; | |
935 | return (offset < fulllen) ? &path[offset] : NULL; | |
936 | } | |
937 | ||
938 | /* | |
939 | * Check that @subdir is a subdir of @dir. @len is the length of | |
940 | * @dir (to avoid having to recalculate it). | |
941 | */ | |
942 | static bool is_subdir(const char *subdir, const char *dir, size_t len) | |
943 | { | |
944 | size_t subdirlen = strlen(subdir); | |
945 | ||
946 | if (subdirlen < len) | |
947 | return false; | |
b14fc100 | 948 | |
592fd47a SH |
949 | if (strncmp(subdir, dir, len) != 0) |
950 | return false; | |
b14fc100 | 951 | |
592fd47a SH |
952 | if (dir[len-1] == '/') |
953 | return true; | |
b14fc100 | 954 | |
592fd47a SH |
955 | if (subdir[len] == '/' || subdirlen == len) |
956 | return true; | |
b14fc100 | 957 | |
592fd47a SH |
958 | return false; |
959 | } | |
960 | ||
961 | /* | |
962 | * Check if the open fd is a symlink. Return -ELOOP if it is. Return | |
963 | * -ENOENT if we couldn't fstat. Return 0 if the fd is ok. | |
964 | */ | |
965 | static int check_symlink(int fd) | |
966 | { | |
967 | struct stat sb; | |
b14fc100 | 968 | int ret; |
969 | ||
970 | ret = fstat(fd, &sb); | |
592fd47a SH |
971 | if (ret < 0) |
972 | return -ENOENT; | |
b14fc100 | 973 | |
592fd47a SH |
974 | if (S_ISLNK(sb.st_mode)) |
975 | return -ELOOP; | |
b14fc100 | 976 | |
592fd47a SH |
977 | return 0; |
978 | } | |
979 | ||
980 | /* | |
981 | * Open a file or directory, provided that it contains no symlinks. | |
982 | * | |
983 | * CAVEAT: This function must not be used for other purposes than container | |
984 | * setup before executing the container's init | |
985 | */ | |
986 | static int open_if_safe(int dirfd, const char *nextpath) | |
987 | { | |
988 | int newfd = openat(dirfd, nextpath, O_RDONLY | O_NOFOLLOW); | |
1a0e70ac | 989 | if (newfd >= 0) /* Was not a symlink, all good. */ |
592fd47a SH |
990 | return newfd; |
991 | ||
992 | if (errno == ELOOP) | |
993 | return newfd; | |
994 | ||
995 | if (errno == EPERM || errno == EACCES) { | |
1a0e70ac CB |
996 | /* We're not root (cause we got EPERM) so try opening with |
997 | * O_PATH. | |
998 | */ | |
592fd47a SH |
999 | newfd = openat(dirfd, nextpath, O_PATH | O_NOFOLLOW); |
1000 | if (newfd >= 0) { | |
1a0e70ac CB |
1001 | /* O_PATH will return an fd for symlinks. We know |
1002 | * nextpath wasn't a symlink at last openat, so if fd is | |
1003 | * now a link, then something * fishy is going on. | |
592fd47a SH |
1004 | */ |
1005 | int ret = check_symlink(newfd); | |
1006 | if (ret < 0) { | |
1007 | close(newfd); | |
1008 | newfd = ret; | |
1009 | } | |
1010 | } | |
1011 | } | |
1012 | ||
1013 | return newfd; | |
1014 | } | |
1015 | ||
1016 | /* | |
1017 | * Open a path intending for mounting, ensuring that the final path | |
1018 | * is inside the container's rootfs. | |
1019 | * | |
1020 | * CAVEAT: This function must not be used for other purposes than container | |
1021 | * setup before executing the container's init | |
1022 | * | |
1023 | * @target: path to be opened | |
1024 | * @prefix_skip: a part of @target in which to ignore symbolic links. This | |
1025 | * would be the container's rootfs. | |
1026 | * | |
1027 | * Return an open fd for the path, or <0 on error. | |
1028 | */ | |
1029 | static int open_without_symlink(const char *target, const char *prefix_skip) | |
1030 | { | |
1031 | int curlen = 0, dirfd, fulllen, i; | |
1032 | char *dup = NULL; | |
1033 | ||
1034 | fulllen = strlen(target); | |
1035 | ||
1036 | /* make sure prefix-skip makes sense */ | |
01074e5b | 1037 | if (prefix_skip && strlen(prefix_skip) > 0) { |
592fd47a SH |
1038 | curlen = strlen(prefix_skip); |
1039 | if (!is_subdir(target, prefix_skip, curlen)) { | |
1040 | ERROR("WHOA there - target '%s' didn't start with prefix '%s'", | |
1041 | target, prefix_skip); | |
1042 | return -EINVAL; | |
1043 | } | |
b14fc100 | 1044 | |
592fd47a SH |
1045 | /* |
1046 | * get_nextpath() expects the curlen argument to be | |
1047 | * on a (turned into \0) / or before it, so decrement | |
1048 | * curlen to make sure that happens | |
1049 | */ | |
1050 | if (curlen) | |
1051 | curlen--; | |
1052 | } else { | |
1053 | prefix_skip = "/"; | |
1054 | curlen = 0; | |
1055 | } | |
1056 | ||
1057 | /* Make a copy of target which we can hack up, and tokenize it */ | |
1058 | if ((dup = strdup(target)) == NULL) { | |
1059 | SYSERROR("Out of memory checking for symbolic link"); | |
1060 | return -ENOMEM; | |
1061 | } | |
b14fc100 | 1062 | |
592fd47a SH |
1063 | for (i = 0; i < fulllen; i++) { |
1064 | if (dup[i] == '/') | |
1065 | dup[i] = '\0'; | |
1066 | } | |
1067 | ||
1068 | dirfd = open(prefix_skip, O_RDONLY); | |
1069 | if (dirfd < 0) | |
1070 | goto out; | |
b14fc100 | 1071 | |
592fd47a SH |
1072 | while (1) { |
1073 | int newfd, saved_errno; | |
1074 | char *nextpath; | |
1075 | ||
1076 | if ((nextpath = get_nextpath(dup, &curlen, fulllen)) == NULL) | |
1077 | goto out; | |
b14fc100 | 1078 | |
592fd47a SH |
1079 | newfd = open_if_safe(dirfd, nextpath); |
1080 | saved_errno = errno; | |
1081 | close(dirfd); | |
b14fc100 | 1082 | |
592fd47a SH |
1083 | dirfd = newfd; |
1084 | if (newfd < 0) { | |
1085 | errno = saved_errno; | |
1086 | if (errno == ELOOP) | |
1087 | SYSERROR("%s in %s was a symbolic link!", nextpath, target); | |
b14fc100 | 1088 | |
592fd47a SH |
1089 | goto out; |
1090 | } | |
1091 | } | |
1092 | ||
1093 | out: | |
1094 | free(dup); | |
1095 | return dirfd; | |
1096 | } | |
1097 | ||
1098 | /* | |
1099 | * Safely mount a path into a container, ensuring that the mount target | |
1100 | * is under the container's @rootfs. (If @rootfs is NULL, then the container | |
1101 | * uses the host's /) | |
1102 | * | |
1103 | * CAVEAT: This function must not be used for other purposes than container | |
1104 | * setup before executing the container's init | |
1105 | */ | |
1106 | int safe_mount(const char *src, const char *dest, const char *fstype, | |
1107 | unsigned long flags, const void *data, const char *rootfs) | |
1108 | { | |
1a0e70ac CB |
1109 | int destfd, ret, saved_errno; |
1110 | /* Only needs enough for /proc/self/fd/<fd>. */ | |
1111 | char srcbuf[50], destbuf[50]; | |
1112 | int srcfd = -1; | |
592fd47a SH |
1113 | const char *mntsrc = src; |
1114 | ||
1115 | if (!rootfs) | |
1116 | rootfs = ""; | |
1117 | ||
1118 | /* todo - allow symlinks for relative paths if 'allowsymlinks' option is passed */ | |
1119 | if (flags & MS_BIND && src && src[0] != '/') { | |
1120 | INFO("this is a relative bind mount"); | |
b14fc100 | 1121 | |
592fd47a SH |
1122 | srcfd = open_without_symlink(src, NULL); |
1123 | if (srcfd < 0) | |
1124 | return srcfd; | |
b14fc100 | 1125 | |
592fd47a SH |
1126 | ret = snprintf(srcbuf, 50, "/proc/self/fd/%d", srcfd); |
1127 | if (ret < 0 || ret > 50) { | |
1128 | close(srcfd); | |
1129 | ERROR("Out of memory"); | |
1130 | return -EINVAL; | |
1131 | } | |
1132 | mntsrc = srcbuf; | |
1133 | } | |
1134 | ||
1135 | destfd = open_without_symlink(dest, rootfs); | |
1136 | if (destfd < 0) { | |
88e078ba CB |
1137 | if (srcfd != -1) { |
1138 | saved_errno = errno; | |
592fd47a | 1139 | close(srcfd); |
88e078ba CB |
1140 | errno = saved_errno; |
1141 | } | |
b14fc100 | 1142 | |
592fd47a SH |
1143 | return destfd; |
1144 | } | |
1145 | ||
1146 | ret = snprintf(destbuf, 50, "/proc/self/fd/%d", destfd); | |
1147 | if (ret < 0 || ret > 50) { | |
1148 | if (srcfd != -1) | |
1149 | close(srcfd); | |
b14fc100 | 1150 | |
592fd47a SH |
1151 | close(destfd); |
1152 | ERROR("Out of memory"); | |
1153 | return -EINVAL; | |
1154 | } | |
1155 | ||
1156 | ret = mount(mntsrc, destbuf, fstype, flags, data); | |
1157 | saved_errno = errno; | |
1158 | if (srcfd != -1) | |
1159 | close(srcfd); | |
b14fc100 | 1160 | |
592fd47a SH |
1161 | close(destfd); |
1162 | if (ret < 0) { | |
1163 | errno = saved_errno; | |
0103eb53 | 1164 | SYSERROR("Failed to mount %s onto %s", src ? src : "(null)", dest); |
592fd47a SH |
1165 | return ret; |
1166 | } | |
1167 | ||
1168 | return 0; | |
1169 | } | |
1170 | ||
ced03a01 SH |
1171 | /* |
1172 | * Mount a proc under @rootfs if proc self points to a pid other than | |
1173 | * my own. This is needed to have a known-good proc mount for setting | |
1174 | * up LSMs both at container startup and attach. | |
1175 | * | |
1176 | * @rootfs : the rootfs where proc should be mounted | |
1177 | * | |
1178 | * Returns < 0 on failure, 0 if the correct proc was already mounted | |
1179 | * and 1 if a new proc was mounted. | |
f267d666 BP |
1180 | * |
1181 | * NOTE: not to be called from inside the container namespace! | |
ced03a01 | 1182 | */ |
943144d9 | 1183 | int lxc_mount_proc_if_needed(const char *rootfs) |
ced03a01 SH |
1184 | { |
1185 | char path[MAXPATHLEN]; | |
6b1ba5d6 | 1186 | int link_to_pid, linklen, mypid, ret; |
40464e8a | 1187 | char link[INTTYPE_TO_STRLEN(pid_t)] = {0}; |
ced03a01 SH |
1188 | |
1189 | ret = snprintf(path, MAXPATHLEN, "%s/proc/self", rootfs); | |
1190 | if (ret < 0 || ret >= MAXPATHLEN) { | |
1191 | SYSERROR("proc path name too long"); | |
1192 | return -1; | |
1193 | } | |
fc2ad9dc | 1194 | |
979a0d93 | 1195 | linklen = readlink(path, link, sizeof(link)); |
fc2ad9dc | 1196 | |
ced03a01 | 1197 | ret = snprintf(path, MAXPATHLEN, "%s/proc", rootfs); |
d539a2b2 CB |
1198 | if (ret < 0 || ret >= MAXPATHLEN) { |
1199 | SYSERROR("proc path name too long"); | |
1200 | return -1; | |
1201 | } | |
fc2ad9dc CB |
1202 | |
1203 | /* /proc not mounted */ | |
1204 | if (linklen < 0) { | |
1205 | if (mkdir(path, 0755) && errno != EEXIST) | |
1206 | return -1; | |
b14fc100 | 1207 | |
ced03a01 | 1208 | goto domount; |
979a0d93 | 1209 | } else if (linklen >= sizeof(link)) { |
6b1ba5d6 CB |
1210 | link[linklen - 1] = '\0'; |
1211 | ERROR("readlink returned truncated content: \"%s\"", link); | |
1212 | return -1; | |
fc2ad9dc CB |
1213 | } |
1214 | ||
0059379f | 1215 | mypid = lxc_raw_getpid(); |
6b1ba5d6 CB |
1216 | INFO("I am %d, /proc/self points to \"%s\"", mypid, link); |
1217 | ||
2d036cca CB |
1218 | if (lxc_safe_int(link, &link_to_pid) < 0) |
1219 | return -1; | |
fc2ad9dc | 1220 | |
6b1ba5d6 CB |
1221 | /* correct procfs is already mounted */ |
1222 | if (link_to_pid == mypid) | |
1223 | return 0; | |
fc2ad9dc | 1224 | |
6b1ba5d6 CB |
1225 | ret = umount2(path, MNT_DETACH); |
1226 | if (ret < 0) | |
1227 | WARN("failed to umount \"%s\" with MNT_DETACH", path); | |
ced03a01 SH |
1228 | |
1229 | domount: | |
fc2ad9dc | 1230 | /* rootfs is NULL */ |
6b1ba5d6 | 1231 | if (!strcmp(rootfs, "")) |
f267d666 BP |
1232 | ret = mount("proc", path, "proc", 0, NULL); |
1233 | else | |
1234 | ret = safe_mount("proc", path, "proc", 0, NULL, rootfs); | |
f267d666 | 1235 | if (ret < 0) |
ced03a01 | 1236 | return -1; |
f267d666 | 1237 | |
fc2ad9dc | 1238 | INFO("mounted /proc in container for security transition"); |
ced03a01 SH |
1239 | return 1; |
1240 | } | |
69aeabac | 1241 | |
f8dd0275 | 1242 | int open_devnull(void) |
69aeabac | 1243 | { |
f8dd0275 AM |
1244 | int fd = open("/dev/null", O_RDWR); |
1245 | ||
1246 | if (fd < 0) | |
1247 | SYSERROR("Can't open /dev/null"); | |
1248 | ||
1249 | return fd; | |
1250 | } | |
69aeabac | 1251 | |
f8dd0275 AM |
1252 | int set_stdfds(int fd) |
1253 | { | |
bbbf65ee CB |
1254 | int ret; |
1255 | ||
69aeabac TA |
1256 | if (fd < 0) |
1257 | return -1; | |
1258 | ||
bbbf65ee CB |
1259 | ret = dup2(fd, STDIN_FILENO); |
1260 | if (ret < 0) | |
f8dd0275 | 1261 | return -1; |
bbbf65ee CB |
1262 | |
1263 | ret = dup2(fd, STDOUT_FILENO); | |
1264 | if (ret < 0) | |
f8dd0275 | 1265 | return -1; |
bbbf65ee CB |
1266 | |
1267 | ret = dup2(fd, STDERR_FILENO); | |
1268 | if (ret < 0) | |
f8dd0275 AM |
1269 | return -1; |
1270 | ||
1271 | return 0; | |
1272 | } | |
1273 | ||
1274 | int null_stdfds(void) | |
1275 | { | |
1276 | int ret = -1; | |
b14fc100 | 1277 | int fd; |
f8dd0275 | 1278 | |
b14fc100 | 1279 | fd = open_devnull(); |
f8dd0275 AM |
1280 | if (fd >= 0) { |
1281 | ret = set_stdfds(fd); | |
1282 | close(fd); | |
1283 | } | |
69aeabac | 1284 | |
69aeabac TA |
1285 | return ret; |
1286 | } | |
ccb4cabe | 1287 | |
330ae3d3 | 1288 | /* Check whether a signal is blocked by a process. */ |
de3c491b | 1289 | /* /proc/pid-to-str/status\0 = (5 + 21 + 7 + 1) */ |
40464e8a | 1290 | #define __PROC_STATUS_LEN (6 + INTTYPE_TO_STRLEN(pid_t) + 7 + 1) |
573ad77f | 1291 | bool task_blocks_signal(pid_t pid, int signal) |
330ae3d3 | 1292 | { |
330ae3d3 | 1293 | int ret; |
de3c491b | 1294 | char status[__PROC_STATUS_LEN]; |
eabf1ea9 | 1295 | FILE *f; |
573ad77f | 1296 | uint64_t sigblk = 0, one = 1; |
eabf1ea9 CB |
1297 | size_t n = 0; |
1298 | bool bret = false; | |
1299 | char *line = NULL; | |
330ae3d3 | 1300 | |
de3c491b CB |
1301 | ret = snprintf(status, __PROC_STATUS_LEN, "/proc/%d/status", pid); |
1302 | if (ret < 0 || ret >= __PROC_STATUS_LEN) | |
330ae3d3 CB |
1303 | return bret; |
1304 | ||
1305 | f = fopen(status, "r"); | |
1306 | if (!f) | |
1307 | return bret; | |
1308 | ||
1309 | while (getline(&line, &n, f) != -1) { | |
573ad77f CB |
1310 | char *numstr; |
1311 | ||
eabf1ea9 | 1312 | if (strncmp(line, "SigBlk:", 7)) |
6fbcbe3b CB |
1313 | continue; |
1314 | ||
573ad77f CB |
1315 | numstr = lxc_trim_whitespace_in_place(line + 7); |
1316 | ret = lxc_safe_uint64(numstr, &sigblk, 16); | |
1317 | if (ret < 0) | |
6fbcbe3b | 1318 | goto out; |
573ad77f CB |
1319 | |
1320 | break; | |
330ae3d3 CB |
1321 | } |
1322 | ||
573ad77f | 1323 | if (sigblk & (one << (signal - 1))) |
330ae3d3 CB |
1324 | bret = true; |
1325 | ||
1326 | out: | |
1327 | free(line); | |
1328 | fclose(f); | |
1329 | return bret; | |
1330 | } | |
000dfda7 | 1331 | |
a687256f CB |
1332 | int lxc_preserve_ns(const int pid, const char *ns) |
1333 | { | |
1334 | int ret; | |
a052913d CB |
1335 | /* 5 /proc + 21 /int_as_str + 3 /ns + 20 /NS_NAME + 1 \0 */ |
1336 | #define __NS_PATH_LEN 50 | |
1337 | char path[__NS_PATH_LEN]; | |
a687256f | 1338 | |
4d8ac866 CB |
1339 | /* This way we can use this function to also check whether namespaces |
1340 | * are supported by the kernel by passing in the NULL or the empty | |
1341 | * string. | |
1342 | */ | |
a052913d | 1343 | ret = snprintf(path, __NS_PATH_LEN, "/proc/%d/ns%s%s", pid, |
4d8ac866 CB |
1344 | !ns || strcmp(ns, "") == 0 ? "" : "/", |
1345 | !ns || strcmp(ns, "") == 0 ? "" : ns); | |
ea918412 | 1346 | if (ret < 0 || (size_t)ret >= __NS_PATH_LEN) { |
1347 | errno = EFBIG; | |
1348 | return -1; | |
1349 | } | |
a687256f CB |
1350 | |
1351 | return open(path, O_RDONLY | O_CLOEXEC); | |
1352 | } | |
6bc2eafe | 1353 | |
dbaf55a3 CB |
1354 | int lxc_switch_uid_gid(uid_t uid, gid_t gid) |
1355 | { | |
db2d1af1 CB |
1356 | int ret = 0; |
1357 | ||
1358 | if (gid != LXC_INVALID_GID) { | |
1359 | ret = setgid(gid); | |
1360 | if (ret < 0) { | |
1361 | SYSERROR("Failed to switch to gid %d", gid); | |
1362 | return -1; | |
1363 | } | |
1364 | NOTICE("Switched to gid %d", gid); | |
dbaf55a3 | 1365 | } |
dbaf55a3 | 1366 | |
db2d1af1 CB |
1367 | if (uid != LXC_INVALID_UID) { |
1368 | ret = setuid(uid); | |
1369 | if (ret < 0) { | |
1370 | SYSERROR("Failed to switch to uid %d", uid); | |
1371 | return -1; | |
1372 | } | |
1373 | NOTICE("Switched to uid %d", uid); | |
dbaf55a3 | 1374 | } |
dbaf55a3 | 1375 | |
db2d1af1 | 1376 | return ret; |
dbaf55a3 CB |
1377 | } |
1378 | ||
1379 | /* Simple covenience function which enables uniform logging. */ | |
8af07f82 | 1380 | bool lxc_setgroups(int size, gid_t list[]) |
dbaf55a3 CB |
1381 | { |
1382 | if (setgroups(size, list) < 0) { | |
8af07f82 CB |
1383 | SYSERROR("Failed to setgroups()"); |
1384 | return false; | |
dbaf55a3 | 1385 | } |
8af07f82 | 1386 | NOTICE("Dropped additional groups"); |
dbaf55a3 | 1387 | |
8af07f82 | 1388 | return true; |
dbaf55a3 | 1389 | } |
c6868a1f CB |
1390 | |
1391 | static int lxc_get_unused_loop_dev_legacy(char *loop_name) | |
1392 | { | |
1393 | struct dirent *dp; | |
1394 | struct loop_info64 lo64; | |
1395 | DIR *dir; | |
1396 | int dfd = -1, fd = -1, ret = -1; | |
1397 | ||
1398 | dir = opendir("/dev"); | |
1399 | if (!dir) | |
1400 | return -1; | |
1401 | ||
1402 | while ((dp = readdir(dir))) { | |
c6868a1f CB |
1403 | if (strncmp(dp->d_name, "loop", 4) != 0) |
1404 | continue; | |
1405 | ||
1406 | dfd = dirfd(dir); | |
1407 | if (dfd < 0) | |
1408 | continue; | |
1409 | ||
1410 | fd = openat(dfd, dp->d_name, O_RDWR); | |
1411 | if (fd < 0) | |
1412 | continue; | |
1413 | ||
1414 | ret = ioctl(fd, LOOP_GET_STATUS64, &lo64); | |
1415 | if (ret < 0) { | |
1416 | if (ioctl(fd, LOOP_GET_STATUS64, &lo64) == 0 || | |
1417 | errno != ENXIO) { | |
1418 | close(fd); | |
1419 | fd = -1; | |
1420 | continue; | |
1421 | } | |
1422 | } | |
1423 | ||
1424 | ret = snprintf(loop_name, LO_NAME_SIZE, "/dev/%s", dp->d_name); | |
1425 | if (ret < 0 || ret >= LO_NAME_SIZE) { | |
1426 | close(fd); | |
1427 | fd = -1; | |
1428 | continue; | |
1429 | } | |
1430 | ||
1431 | break; | |
1432 | } | |
1433 | ||
1434 | closedir(dir); | |
1435 | ||
1436 | if (fd < 0) | |
1437 | return -1; | |
1438 | ||
1439 | return fd; | |
1440 | } | |
1441 | ||
1442 | static int lxc_get_unused_loop_dev(char *name_loop) | |
1443 | { | |
1444 | int loop_nr, ret; | |
1445 | int fd_ctl = -1, fd_tmp = -1; | |
1446 | ||
1447 | fd_ctl = open("/dev/loop-control", O_RDWR | O_CLOEXEC); | |
1448 | if (fd_ctl < 0) | |
1449 | return -ENODEV; | |
1450 | ||
1451 | loop_nr = ioctl(fd_ctl, LOOP_CTL_GET_FREE); | |
1452 | if (loop_nr < 0) | |
1453 | goto on_error; | |
1454 | ||
1455 | ret = snprintf(name_loop, LO_NAME_SIZE, "/dev/loop%d", loop_nr); | |
1456 | if (ret < 0 || ret >= LO_NAME_SIZE) | |
1457 | goto on_error; | |
1458 | ||
1459 | fd_tmp = open(name_loop, O_RDWR | O_CLOEXEC); | |
1460 | if (fd_tmp < 0) | |
1461 | goto on_error; | |
1462 | ||
1463 | on_error: | |
1464 | close(fd_ctl); | |
1465 | return fd_tmp; | |
1466 | } | |
1467 | ||
1468 | int lxc_prepare_loop_dev(const char *source, char *loop_dev, int flags) | |
1469 | { | |
1470 | int ret; | |
1471 | struct loop_info64 lo64; | |
1472 | int fd_img = -1, fret = -1, fd_loop = -1; | |
1473 | ||
1474 | fd_loop = lxc_get_unused_loop_dev(loop_dev); | |
1475 | if (fd_loop < 0) { | |
1476 | if (fd_loop == -ENODEV) | |
1477 | fd_loop = lxc_get_unused_loop_dev_legacy(loop_dev); | |
1478 | else | |
1479 | goto on_error; | |
1480 | } | |
1481 | ||
1482 | fd_img = open(source, O_RDWR | O_CLOEXEC); | |
1483 | if (fd_img < 0) | |
1484 | goto on_error; | |
1485 | ||
1486 | ret = ioctl(fd_loop, LOOP_SET_FD, fd_img); | |
1487 | if (ret < 0) | |
1488 | goto on_error; | |
1489 | ||
1490 | memset(&lo64, 0, sizeof(lo64)); | |
1491 | lo64.lo_flags = flags; | |
1492 | ||
1493 | ret = ioctl(fd_loop, LOOP_SET_STATUS64, &lo64); | |
1494 | if (ret < 0) | |
1495 | goto on_error; | |
1496 | ||
1497 | fret = 0; | |
1498 | ||
1499 | on_error: | |
1500 | if (fd_img >= 0) | |
1501 | close(fd_img); | |
1502 | ||
1503 | if (fret < 0 && fd_loop >= 0) { | |
1504 | close(fd_loop); | |
1505 | fd_loop = -1; | |
1506 | } | |
1507 | ||
1508 | return fd_loop; | |
1509 | } | |
74251e49 CB |
1510 | |
1511 | int lxc_unstack_mountpoint(const char *path, bool lazy) | |
1512 | { | |
1513 | int ret; | |
1514 | int umounts = 0; | |
1515 | ||
1516 | pop_stack: | |
1517 | ret = umount2(path, lazy ? MNT_DETACH : 0); | |
1518 | if (ret < 0) { | |
1519 | /* We consider anything else than EINVAL deadly to prevent going | |
1520 | * into an infinite loop. (The other alternative is constantly | |
1521 | * parsing /proc/self/mountinfo which is yucky and probably | |
1522 | * racy.) | |
1523 | */ | |
1524 | if (errno != EINVAL) | |
1525 | return -errno; | |
1526 | } else { | |
b4a40f7b CB |
1527 | /* Just stop counting when this happens. That'd just be so |
1528 | * stupid that we won't even bother trying to report back the | |
1529 | * correct value anymore. | |
1530 | */ | |
1531 | if (umounts != INT_MAX) | |
1532 | umounts++; | |
b14fc100 | 1533 | |
74251e49 CB |
1534 | /* We succeeded in umounting. Make sure that there's no other |
1535 | * mountpoint stacked underneath. | |
1536 | */ | |
74251e49 CB |
1537 | goto pop_stack; |
1538 | } | |
1539 | ||
1540 | return umounts; | |
1541 | } | |
ea3a694f CB |
1542 | |
1543 | int run_command(char *buf, size_t buf_size, int (*child_fn)(void *), void *args) | |
1544 | { | |
1545 | pid_t child; | |
1546 | int ret, fret, pipefd[2]; | |
1547 | ssize_t bytes; | |
1548 | ||
46210729 | 1549 | /* Make sure our callers do not receive uninitialized memory. */ |
ea3a694f CB |
1550 | if (buf_size > 0 && buf) |
1551 | buf[0] = '\0'; | |
1552 | ||
1553 | if (pipe(pipefd) < 0) { | |
1554 | SYSERROR("failed to create pipe"); | |
1555 | return -1; | |
1556 | } | |
1557 | ||
2d728b2f | 1558 | child = lxc_raw_clone(0); |
ea3a694f CB |
1559 | if (child < 0) { |
1560 | close(pipefd[0]); | |
1561 | close(pipefd[1]); | |
1562 | SYSERROR("failed to create new process"); | |
1563 | return -1; | |
1564 | } | |
1565 | ||
1566 | if (child == 0) { | |
1567 | /* Close the read-end of the pipe. */ | |
1568 | close(pipefd[0]); | |
1569 | ||
1570 | /* Redirect std{err,out} to write-end of the | |
1571 | * pipe. | |
1572 | */ | |
1573 | ret = dup2(pipefd[1], STDOUT_FILENO); | |
1574 | if (ret >= 0) | |
1575 | ret = dup2(pipefd[1], STDERR_FILENO); | |
1576 | ||
1577 | /* Close the write-end of the pipe. */ | |
1578 | close(pipefd[1]); | |
1579 | ||
1580 | if (ret < 0) { | |
1581 | SYSERROR("failed to duplicate std{err,out} file descriptor"); | |
d8b3f9c3 | 1582 | _exit(EXIT_FAILURE); |
ea3a694f CB |
1583 | } |
1584 | ||
1585 | /* Does not return. */ | |
1586 | child_fn(args); | |
1587 | ERROR("failed to exec command"); | |
d8b3f9c3 | 1588 | _exit(EXIT_FAILURE); |
ea3a694f CB |
1589 | } |
1590 | ||
1591 | /* close the write-end of the pipe */ | |
1592 | close(pipefd[1]); | |
1593 | ||
7a643c7c | 1594 | if (buf && buf_size > 0) { |
a5bc6cb0 | 1595 | bytes = lxc_read_nointr(pipefd[0], buf, buf_size - 1); |
7a643c7c CB |
1596 | if (bytes > 0) |
1597 | buf[bytes - 1] = '\0'; | |
1598 | } | |
ea3a694f CB |
1599 | |
1600 | fret = wait_for_pid(child); | |
1601 | /* close the read-end of the pipe */ | |
1602 | close(pipefd[0]); | |
1603 | ||
1604 | return fret; | |
1605 | } | |
04ad7ffe | 1606 | |
d75c14e2 CB |
1607 | bool lxc_nic_exists(char *nic) |
1608 | { | |
1609 | #define __LXC_SYS_CLASS_NET_LEN 15 + IFNAMSIZ + 1 | |
1610 | char path[__LXC_SYS_CLASS_NET_LEN]; | |
1611 | int ret; | |
1612 | struct stat sb; | |
1613 | ||
1614 | if (!strcmp(nic, "none")) | |
1615 | return true; | |
1616 | ||
1617 | ret = snprintf(path, __LXC_SYS_CLASS_NET_LEN, "/sys/class/net/%s", nic); | |
1618 | if (ret < 0 || (size_t)ret >= __LXC_SYS_CLASS_NET_LEN) | |
1619 | return false; | |
1620 | ||
1621 | ret = stat(path, &sb); | |
1622 | if (ret < 0) | |
1623 | return false; | |
1624 | ||
1625 | return true; | |
1626 | } | |
127c6e70 | 1627 | |
6222c3f4 CB |
1628 | uint64_t lxc_find_next_power2(uint64_t n) |
1629 | { | |
1630 | /* 0 is not valid input. We return 0 to the caller since 0 is not a | |
1631 | * valid power of two. | |
1632 | */ | |
1633 | if (n == 0) | |
1634 | return 0; | |
1635 | ||
1636 | if (!(n & (n - 1))) | |
1637 | return n; | |
1638 | ||
1639 | while (n & (n - 1)) | |
1640 | n = n & (n - 1); | |
1641 | ||
1642 | n = n << 1; | |
1643 | return n; | |
1644 | } | |
1fd0f41e CB |
1645 | |
1646 | int lxc_set_death_signal(int signal) | |
1647 | { | |
1648 | int ret; | |
1649 | pid_t ppid; | |
1650 | ||
b81689a1 CB |
1651 | ret = prctl(PR_SET_PDEATHSIG, prctl_arg(signal), prctl_arg(0), |
1652 | prctl_arg(0), prctl_arg(0)); | |
1fd0f41e CB |
1653 | |
1654 | /* Check whether we have been orphaned. */ | |
1655 | ppid = (pid_t)syscall(SYS_getppid); | |
1656 | if (ppid == 1) { | |
1657 | pid_t self; | |
1658 | ||
1659 | self = lxc_raw_getpid(); | |
1660 | ret = kill(self, SIGKILL); | |
1661 | if (ret < 0) | |
1662 | return -1; | |
1663 | } | |
1664 | ||
1665 | if (ret < 0) { | |
1666 | SYSERROR("Failed to set PR_SET_PDEATHSIG to %d", signal); | |
1667 | return -1; | |
1668 | } | |
1669 | ||
1670 | return 0; | |
1671 | } | |
7ad37670 | 1672 | |
a9d4ebc1 CB |
1673 | int fd_cloexec(int fd, bool cloexec) |
1674 | { | |
1675 | int oflags, nflags; | |
1676 | ||
1677 | oflags = fcntl(fd, F_GETFD, 0); | |
1678 | if (oflags < 0) | |
1679 | return -errno; | |
1680 | ||
1681 | if (cloexec) | |
1682 | nflags = oflags | FD_CLOEXEC; | |
1683 | else | |
1684 | nflags = oflags & ~FD_CLOEXEC; | |
1685 | ||
1686 | if (nflags == oflags) | |
1687 | return 0; | |
1688 | ||
1689 | if (fcntl(fd, F_SETFD, nflags) < 0) | |
1690 | return -errno; | |
1691 | ||
1692 | return 0; | |
1693 | } | |
d7ab0375 | 1694 | |
1695 | int recursive_destroy(char *dirname) | |
1696 | { | |
1697 | int ret; | |
1698 | struct dirent *direntp; | |
1699 | DIR *dir; | |
1700 | int r = 0; | |
1701 | ||
1702 | dir = opendir(dirname); | |
1703 | if (!dir) | |
1704 | return -1; | |
1705 | ||
1706 | while ((direntp = readdir(dir))) { | |
1707 | char *pathname; | |
1708 | struct stat mystat; | |
1709 | ||
1710 | if (!strcmp(direntp->d_name, ".") || | |
1711 | !strcmp(direntp->d_name, "..")) | |
1712 | continue; | |
1713 | ||
1714 | pathname = must_make_path(dirname, direntp->d_name, NULL); | |
1715 | ||
1716 | ret = lstat(pathname, &mystat); | |
1717 | if (ret < 0) { | |
1718 | if (!r) | |
1719 | WARN("Failed to stat \"%s\"", pathname); | |
1720 | ||
1721 | r = -1; | |
1722 | goto next; | |
1723 | } | |
1724 | ||
1725 | if (!S_ISDIR(mystat.st_mode)) | |
1726 | goto next; | |
1727 | ||
1728 | ret = recursive_destroy(pathname); | |
1729 | if (ret < 0) | |
1730 | r = -1; | |
1731 | ||
1732 | next: | |
1733 | free(pathname); | |
1734 | } | |
1735 | ||
1736 | ret = rmdir(dirname); | |
1737 | if (ret < 0) { | |
1738 | if (!r) | |
1739 | SYSWARN("Failed to delete \"%s\"", dirname); | |
1740 | ||
1741 | r = -1; | |
1742 | } | |
1743 | ||
1744 | ret = closedir(dir); | |
1745 | if (ret < 0) { | |
1746 | if (!r) | |
1747 | SYSWARN("Failed to delete \"%s\"", dirname); | |
1748 | ||
1749 | r = -1; | |
1750 | } | |
1751 | ||
1752 | return r; | |
1753 | } |