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1960e228 | 1 | /* -*- c-file-style: "linux" -*- |
0ecfbf27 MP |
2 | * |
3 | * Copyright (C) 1996-2000 by Andrew Tridgell | |
4 | * Copyright (C) Paul Mackerras 1996 | |
5 | * Copyright (C) 2001, 2002 by Martin Pool <mbp@samba.org> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software | |
19 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
20 | */ | |
c627d613 | 21 | |
ac13ad10 | 22 | /** |
0ecfbf27 | 23 | * @file |
ac13ad10 MP |
24 | * |
25 | * Utilities used in rsync | |
26 | **/ | |
c627d613 | 27 | |
c627d613 AT |
28 | #include "rsync.h" |
29 | ||
c7c11a0d DD |
30 | extern int verbose; |
31 | ||
0ecfbf27 MP |
32 | int sanitize_paths = 0; |
33 | ||
34 | ||
f0359dd0 | 35 | |
ac13ad10 | 36 | /** |
0ecfbf27 MP |
37 | * Set a fd into nonblocking mode |
38 | **/ | |
f0359dd0 AT |
39 | void set_nonblocking(int fd) |
40 | { | |
41 | int val; | |
42 | ||
0ecfbf27 | 43 | if ((val = fcntl(fd, F_GETFL, 0)) == -1) |
f0359dd0 AT |
44 | return; |
45 | if (!(val & NONBLOCK_FLAG)) { | |
46 | val |= NONBLOCK_FLAG; | |
47 | fcntl(fd, F_SETFL, val); | |
48 | } | |
49 | } | |
50 | ||
ac13ad10 | 51 | /** |
0ecfbf27 MP |
52 | * Set a fd into blocking mode |
53 | **/ | |
36349ea0 AT |
54 | void set_blocking(int fd) |
55 | { | |
56 | int val; | |
57 | ||
0ecfbf27 | 58 | if ((val = fcntl(fd, F_GETFL, 0)) == -1) |
36349ea0 AT |
59 | return; |
60 | if (val & NONBLOCK_FLAG) { | |
61 | val &= ~NONBLOCK_FLAG; | |
62 | fcntl(fd, F_SETFL, val); | |
63 | } | |
64 | } | |
65 | ||
f0359dd0 | 66 | |
ac13ad10 | 67 | /** |
0ecfbf27 MP |
68 | * Create a file descriptor pair - like pipe() but use socketpair if |
69 | * possible (because of blocking issues on pipes). | |
70 | * | |
71 | * Always set non-blocking. | |
f0359dd0 | 72 | */ |
08f15335 AT |
73 | int fd_pair(int fd[2]) |
74 | { | |
f0359dd0 AT |
75 | int ret; |
76 | ||
08f15335 | 77 | #if HAVE_SOCKETPAIR |
f0359dd0 | 78 | ret = socketpair(AF_UNIX, SOCK_STREAM, 0, fd); |
08f15335 | 79 | #else |
f0359dd0 | 80 | ret = pipe(fd); |
08f15335 | 81 | #endif |
f0359dd0 AT |
82 | |
83 | if (ret == 0) { | |
84 | set_nonblocking(fd[0]); | |
85 | set_nonblocking(fd[1]); | |
86 | } | |
0ecfbf27 | 87 | |
f0359dd0 | 88 | return ret; |
08f15335 AT |
89 | } |
90 | ||
91 | ||
0ecfbf27 | 92 | void print_child_argv(char **cmd) |
5ad0e46f | 93 | { |
1bbd10fe | 94 | rprintf(FINFO, "opening connection using "); |
5ad0e46f MP |
95 | for (; *cmd; cmd++) { |
96 | /* Look for characters that ought to be quoted. This | |
97 | * is not a great quoting algorithm, but it's | |
98 | * sufficient for a log message. */ | |
99 | if (strspn(*cmd, "abcdefghijklmnopqrstuvwxyz" | |
100 | "ABCDEFGHIJKLMNOPQRSTUVWXYZ" | |
101 | "0123456789" | |
102 | ",.-_=+@/") != strlen(*cmd)) { | |
103 | rprintf(FINFO, "\"%s\" ", *cmd); | |
104 | } else { | |
105 | rprintf(FINFO, "%s ", *cmd); | |
106 | } | |
107 | } | |
108 | rprintf(FINFO, "\n"); | |
109 | } | |
110 | ||
111 | ||
c627d613 AT |
112 | void out_of_memory(char *str) |
113 | { | |
9486289c | 114 | rprintf(FERROR,"ERROR: out of memory in %s\n",str); |
65417579 | 115 | exit_cleanup(RERR_MALLOC); |
575f2fca AT |
116 | } |
117 | ||
118 | void overflow(char *str) | |
119 | { | |
9486289c | 120 | rprintf(FERROR,"ERROR: buffer overflow in %s\n",str); |
65417579 | 121 | exit_cleanup(RERR_MALLOC); |
c627d613 AT |
122 | } |
123 | ||
124 | ||
c627d613 | 125 | |
404e813c | 126 | int set_modtime(char *fname, time_t modtime) |
c627d613 | 127 | { |
31e12522 | 128 | extern int dry_run; |
404e813c MP |
129 | if (dry_run) |
130 | return 0; | |
131 | ||
132 | if (verbose > 2) { | |
133 | rprintf(FINFO, "set modtime of %s to (%ld) %s", | |
134 | fname, (long) modtime, | |
135 | asctime(localtime(&modtime))); | |
136 | } | |
137 | ||
31e12522 | 138 | { |
1e9f155a | 139 | #ifdef HAVE_UTIMBUF |
31e12522 AT |
140 | struct utimbuf tbuf; |
141 | tbuf.actime = time(NULL); | |
142 | tbuf.modtime = modtime; | |
143 | return utime(fname,&tbuf); | |
c627d613 | 144 | #elif defined(HAVE_UTIME) |
31e12522 AT |
145 | time_t t[2]; |
146 | t[0] = time(NULL); | |
147 | t[1] = modtime; | |
148 | return utime(fname,t); | |
c627d613 | 149 | #else |
31e12522 AT |
150 | struct timeval t[2]; |
151 | t[0].tv_sec = time(NULL); | |
152 | t[0].tv_usec = 0; | |
153 | t[1].tv_sec = modtime; | |
154 | t[1].tv_usec = 0; | |
155 | return utimes(fname,t); | |
c627d613 | 156 | #endif |
31e12522 | 157 | } |
c627d613 | 158 | } |
94481d91 | 159 | |
720b47f2 | 160 | |
ac13ad10 MP |
161 | /** |
162 | Create any necessary directories in fname. Unfortunately we don't know | |
163 | what perms to give the directory when this is called so we need to rely | |
164 | on the umask | |
165 | **/ | |
0ecfbf27 | 166 | int create_directory_path(char *fname, int base_umask) |
6574b4f7 | 167 | { |
6574b4f7 AT |
168 | char *p; |
169 | ||
170 | while (*fname == '/') fname++; | |
171 | while (strncmp(fname,"./",2)==0) fname += 2; | |
172 | ||
173 | p = fname; | |
174 | while ((p=strchr(p,'/'))) { | |
175 | *p = 0; | |
0ecfbf27 | 176 | do_mkdir(fname, 0777 & ~base_umask); |
6574b4f7 AT |
177 | *p = '/'; |
178 | p++; | |
179 | } | |
180 | return 0; | |
181 | } | |
950ab32d AT |
182 | |
183 | ||
ac13ad10 MP |
184 | /** |
185 | * Write @p len bytes at @p ptr to descriptor @p desc, retrying if | |
186 | * interrupted. | |
187 | * | |
188 | * @retval len upon success | |
189 | * | |
190 | * @retval <0 write's (negative) error code | |
191 | * | |
192 | * Derived from GNU C's cccp.c. | |
193 | */ | |
9dd891bb | 194 | static int full_write(int desc, char *ptr, size_t len) |
950ab32d AT |
195 | { |
196 | int total_written; | |
197 | ||
198 | total_written = 0; | |
199 | while (len > 0) { | |
200 | int written = write (desc, ptr, len); | |
201 | if (written < 0) { | |
202 | #ifdef EINTR | |
203 | if (errno == EINTR) | |
204 | continue; | |
205 | #endif | |
206 | return written; | |
207 | } | |
208 | total_written += written; | |
209 | ptr += written; | |
210 | len -= written; | |
211 | } | |
212 | return total_written; | |
213 | } | |
214 | ||
950ab32d | 215 | |
ac13ad10 MP |
216 | /** |
217 | * Read @p len bytes at @p ptr from descriptor @p desc, retrying if | |
218 | * interrupted. | |
219 | * | |
220 | * @retval >0 the actual number of bytes read | |
221 | * | |
222 | * @retval 0 for EOF | |
223 | * | |
224 | * @retval <0 for an error. | |
225 | * | |
226 | * Derived from GNU C's cccp.c. */ | |
9dd891bb | 227 | static int safe_read(int desc, char *ptr, size_t len) |
950ab32d AT |
228 | { |
229 | int n_chars; | |
230 | ||
9dd891bb | 231 | if (len == 0) |
950ab32d AT |
232 | return len; |
233 | ||
234 | #ifdef EINTR | |
235 | do { | |
236 | n_chars = read(desc, ptr, len); | |
237 | } while (n_chars < 0 && errno == EINTR); | |
238 | #else | |
239 | n_chars = read(desc, ptr, len); | |
240 | #endif | |
241 | ||
242 | return n_chars; | |
243 | } | |
244 | ||
245 | ||
ac13ad10 MP |
246 | /** Copy a file. |
247 | * | |
248 | * This is used in conjunction with the --temp-dir option */ | |
950ab32d AT |
249 | int copy_file(char *source, char *dest, mode_t mode) |
250 | { | |
251 | int ifd; | |
252 | int ofd; | |
253 | char buf[1024 * 8]; | |
254 | int len; /* Number of bytes read into `buf'. */ | |
255 | ||
8c9fd200 | 256 | ifd = do_open(source, O_RDONLY, 0); |
950ab32d | 257 | if (ifd == -1) { |
9486289c | 258 | rprintf(FERROR,"open %s: %s\n", |
950ab32d AT |
259 | source,strerror(errno)); |
260 | return -1; | |
261 | } | |
262 | ||
c7c11a0d | 263 | if (robust_unlink(dest) && errno != ENOENT) { |
9486289c | 264 | rprintf(FERROR,"unlink %s: %s\n", |
950ab32d AT |
265 | dest,strerror(errno)); |
266 | return -1; | |
267 | } | |
268 | ||
31e12522 | 269 | ofd = do_open(dest, O_WRONLY | O_CREAT | O_TRUNC | O_EXCL, mode); |
c46ded46 | 270 | if (ofd == -1) { |
9486289c | 271 | rprintf(FERROR,"open %s: %s\n", |
950ab32d AT |
272 | dest,strerror(errno)); |
273 | close(ifd); | |
274 | return -1; | |
275 | } | |
276 | ||
277 | while ((len = safe_read(ifd, buf, sizeof(buf))) > 0) { | |
278 | if (full_write(ofd, buf, len) < 0) { | |
9486289c | 279 | rprintf(FERROR,"write %s: %s\n", |
950ab32d AT |
280 | dest,strerror(errno)); |
281 | close(ifd); | |
282 | close(ofd); | |
283 | return -1; | |
284 | } | |
285 | } | |
286 | ||
287 | close(ifd); | |
288 | close(ofd); | |
289 | ||
290 | if (len < 0) { | |
9486289c | 291 | rprintf(FERROR,"read %s: %s\n", |
950ab32d AT |
292 | source,strerror(errno)); |
293 | return -1; | |
294 | } | |
295 | ||
296 | return 0; | |
297 | } | |
feaa89c4 | 298 | |
c7c11a0d DD |
299 | /* MAX_RENAMES should be 10**MAX_RENAMES_DIGITS */ |
300 | #define MAX_RENAMES_DIGITS 3 | |
301 | #define MAX_RENAMES 1000 | |
302 | ||
ac13ad10 | 303 | /** |
b4235b31 MP |
304 | * Robust unlink: some OS'es (HPUX) refuse to unlink busy files, so |
305 | * rename to <path>/.rsyncNNN instead. | |
306 | * | |
307 | * Note that successive rsync runs will shuffle the filenames around a | |
308 | * bit as long as the file is still busy; this is because this function | |
309 | * does not know if the unlink call is due to a new file coming in, or | |
310 | * --delete trying to remove old .rsyncNNN files, hence it renames it | |
311 | * each time. | |
312 | **/ | |
c7c11a0d DD |
313 | int robust_unlink(char *fname) |
314 | { | |
315 | #ifndef ETXTBSY | |
316 | return do_unlink(fname); | |
317 | #else | |
318 | static int counter = 1; | |
319 | int rc, pos, start; | |
320 | char path[MAXPATHLEN]; | |
321 | ||
322 | rc = do_unlink(fname); | |
323 | if ((rc == 0) || (errno != ETXTBSY)) | |
324 | return rc; | |
325 | ||
326 | strlcpy(path, fname, MAXPATHLEN); | |
327 | ||
328 | pos = strlen(path); | |
329 | while((path[--pos] != '/') && (pos >= 0)) | |
330 | ; | |
331 | ++pos; | |
332 | strlcpy(&path[pos], ".rsync", MAXPATHLEN-pos); | |
333 | pos += sizeof(".rsync")-1; | |
334 | ||
335 | if (pos > (MAXPATHLEN-MAX_RENAMES_DIGITS-1)) { | |
336 | errno = ETXTBSY; | |
337 | return -1; | |
338 | } | |
339 | ||
340 | /* start where the last one left off to reduce chance of clashes */ | |
341 | start = counter; | |
342 | do { | |
343 | sprintf(&path[pos], "%03d", counter); | |
344 | if (++counter >= MAX_RENAMES) | |
345 | counter = 1; | |
346 | } while (((rc = access(path, 0)) == 0) && (counter != start)); | |
347 | ||
348 | if (verbose > 0) | |
349 | rprintf(FINFO,"renaming %s to %s because of text busy\n", | |
350 | fname, path); | |
351 | ||
352 | /* maybe we should return rename()'s exit status? Nah. */ | |
353 | if (do_rename(fname, path) != 0) { | |
354 | errno = ETXTBSY; | |
355 | return -1; | |
356 | } | |
357 | return 0; | |
358 | #endif | |
359 | } | |
360 | ||
361 | int robust_rename(char *from, char *to) | |
362 | { | |
363 | #ifndef ETXTBSY | |
364 | return do_rename(from, to); | |
365 | #else | |
366 | int rc = do_rename(from, to); | |
367 | if ((rc == 0) || (errno != ETXTBSY)) | |
368 | return rc; | |
369 | if (robust_unlink(to) != 0) | |
370 | return -1; | |
371 | return do_rename(from, to); | |
372 | #endif | |
feaa89c4 | 373 | } |
3ba62a83 AT |
374 | |
375 | ||
376 | static pid_t all_pids[10]; | |
377 | static int num_pids; | |
378 | ||
4cf64834 | 379 | /** Fork and record the pid of the child. **/ |
3ba62a83 AT |
380 | pid_t do_fork(void) |
381 | { | |
382 | pid_t newpid = fork(); | |
383 | ||
4cf64834 | 384 | if (newpid != 0 && newpid != -1) { |
3ba62a83 AT |
385 | all_pids[num_pids++] = newpid; |
386 | } | |
387 | return newpid; | |
388 | } | |
389 | ||
4cf64834 MP |
390 | /** |
391 | * Kill all children. | |
392 | * | |
393 | * @todo It would be kind of nice to make sure that they are actually | |
394 | * all our children before we kill them, because their pids may have | |
395 | * been recycled by some other process. Perhaps when we wait for a | |
396 | * child, we should remove it from this array. Alternatively we could | |
397 | * perhaps use process groups, but I think that would not work on | |
398 | * ancient Unix versions that don't support them. | |
399 | **/ | |
3ba62a83 AT |
400 | void kill_all(int sig) |
401 | { | |
402 | int i; | |
4cf64834 MP |
403 | |
404 | for (i = 0; i < num_pids; i++) { | |
405 | /* Let's just be a little careful where we | |
406 | * point that gun, hey? See kill(2) for the | |
407 | * magic caused by negative values. */ | |
408 | pid_t p = all_pids[i]; | |
409 | ||
410 | if (p == getpid()) | |
411 | continue; | |
412 | if (p <= 0) | |
413 | continue; | |
414 | ||
415 | kill(p, sig); | |
3ba62a83 AT |
416 | } |
417 | } | |
9486289c | 418 | |
4cf64834 | 419 | |
ac13ad10 | 420 | /** Turn a user name into a uid */ |
8ef4ffd6 AT |
421 | int name_to_uid(char *name, uid_t *uid) |
422 | { | |
423 | struct passwd *pass; | |
424 | if (!name || !*name) return 0; | |
425 | pass = getpwnam(name); | |
426 | if (pass) { | |
427 | *uid = pass->pw_uid; | |
428 | return 1; | |
429 | } | |
430 | return 0; | |
431 | } | |
432 | ||
ac13ad10 | 433 | /** Turn a group name into a gid */ |
8ef4ffd6 AT |
434 | int name_to_gid(char *name, gid_t *gid) |
435 | { | |
436 | struct group *grp; | |
437 | if (!name || !*name) return 0; | |
438 | grp = getgrnam(name); | |
439 | if (grp) { | |
440 | *gid = grp->gr_gid; | |
441 | return 1; | |
442 | } | |
443 | return 0; | |
444 | } | |
445 | ||
ff8b29b8 | 446 | |
ac13ad10 | 447 | /** Lock a byte range in a open file */ |
31593dd6 | 448 | int lock_range(int fd, int offset, int len) |
0c515f17 | 449 | { |
31593dd6 | 450 | struct flock lock; |
0c515f17 | 451 | |
31593dd6 AT |
452 | lock.l_type = F_WRLCK; |
453 | lock.l_whence = SEEK_SET; | |
454 | lock.l_start = offset; | |
455 | lock.l_len = len; | |
456 | lock.l_pid = 0; | |
457 | ||
458 | return fcntl(fd,F_SETLK,&lock) == 0; | |
0c515f17 | 459 | } |
874895d5 AT |
460 | |
461 | ||
cb13abfe | 462 | static void glob_expand_one(char *s, char **argv, int *argc, int maxargs) |
874895d5 | 463 | { |
932be9aa | 464 | #if !(defined(HAVE_GLOB) && defined(HAVE_GLOB_H)) |
e42c9458 | 465 | if (!*s) s = "."; |
087bf010 | 466 | argv[*argc] = strdup(s); |
874895d5 AT |
467 | (*argc)++; |
468 | return; | |
469 | #else | |
cb13abfe | 470 | extern int sanitize_paths; |
874895d5 AT |
471 | glob_t globbuf; |
472 | int i; | |
473 | ||
e42c9458 AT |
474 | if (!*s) s = "."; |
475 | ||
cb13abfe DD |
476 | argv[*argc] = strdup(s); |
477 | if (sanitize_paths) { | |
478 | sanitize_path(argv[*argc], NULL); | |
479 | } | |
087bf010 | 480 | |
874895d5 AT |
481 | memset(&globbuf, 0, sizeof(globbuf)); |
482 | glob(argv[*argc], 0, NULL, &globbuf); | |
483 | if (globbuf.gl_pathc == 0) { | |
484 | (*argc)++; | |
485 | globfree(&globbuf); | |
486 | return; | |
487 | } | |
a261989c | 488 | for (i=0; i<(maxargs - (*argc)) && i < (int) globbuf.gl_pathc;i++) { |
874895d5 AT |
489 | if (i == 0) free(argv[*argc]); |
490 | argv[(*argc) + i] = strdup(globbuf.gl_pathv[i]); | |
491 | if (!argv[(*argc) + i]) out_of_memory("glob_expand"); | |
492 | } | |
493 | globfree(&globbuf); | |
494 | (*argc) += i; | |
495 | #endif | |
496 | } | |
5a96ee05 | 497 | |
cb13abfe | 498 | void glob_expand(char *base1, char **argv, int *argc, int maxargs) |
087bf010 AT |
499 | { |
500 | char *s = argv[*argc]; | |
501 | char *p, *q; | |
ba5e128d | 502 | char *base = base1; |
087bf010 AT |
503 | |
504 | if (!s || !*s) return; | |
505 | ||
e42c9458 AT |
506 | if (strncmp(s, base, strlen(base)) == 0) { |
507 | s += strlen(base); | |
508 | } | |
509 | ||
087bf010 AT |
510 | s = strdup(s); |
511 | if (!s) out_of_memory("glob_expand"); | |
512 | ||
8950ac03 | 513 | if (asprintf(&base," %s/", base1) <= 0) out_of_memory("glob_expand"); |
ba5e128d | 514 | |
087bf010 AT |
515 | q = s; |
516 | while ((p = strstr(q,base)) && ((*argc) < maxargs)) { | |
ba5e128d AT |
517 | /* split it at this point */ |
518 | *p = 0; | |
cb13abfe | 519 | glob_expand_one(q, argv, argc, maxargs); |
ba5e128d | 520 | q = p+strlen(base); |
087bf010 AT |
521 | } |
522 | ||
cb13abfe | 523 | if (*q && (*argc < maxargs)) glob_expand_one(q, argv, argc, maxargs); |
087bf010 AT |
524 | |
525 | free(s); | |
ba5e128d | 526 | free(base); |
087bf010 | 527 | } |
5a96ee05 | 528 | |
ac13ad10 MP |
529 | /** |
530 | * Convert a string to lower case | |
531 | **/ | |
5a96ee05 AT |
532 | void strlower(char *s) |
533 | { | |
534 | while (*s) { | |
535 | if (isupper(*s)) *s = tolower(*s); | |
536 | s++; | |
537 | } | |
538 | } | |
e42c9458 | 539 | |
fe8c0a98 AT |
540 | void *Realloc(void *p, int size) |
541 | { | |
542 | if (!p) return (void *)malloc(size); | |
543 | return (void *)realloc(p, size); | |
544 | } | |
5243c216 AT |
545 | |
546 | ||
547 | void clean_fname(char *name) | |
548 | { | |
549 | char *p; | |
550 | int l; | |
551 | int modified = 1; | |
552 | ||
553 | if (!name) return; | |
554 | ||
555 | while (modified) { | |
556 | modified = 0; | |
557 | ||
558 | if ((p=strstr(name,"/./"))) { | |
559 | modified = 1; | |
560 | while (*p) { | |
561 | p[0] = p[2]; | |
562 | p++; | |
563 | } | |
564 | } | |
565 | ||
566 | if ((p=strstr(name,"//"))) { | |
567 | modified = 1; | |
568 | while (*p) { | |
569 | p[0] = p[1]; | |
570 | p++; | |
571 | } | |
572 | } | |
573 | ||
574 | if (strncmp(p=name,"./",2) == 0) { | |
575 | modified = 1; | |
576 | do { | |
577 | p[0] = p[2]; | |
578 | } while (*p++); | |
579 | } | |
580 | ||
581 | l = strlen(p=name); | |
582 | if (l > 1 && p[l-1] == '/') { | |
583 | modified = 1; | |
584 | p[l-1] = 0; | |
585 | } | |
586 | } | |
587 | } | |
588 | ||
ac13ad10 | 589 | /** |
1b8e662a | 590 | * Make path appear as if a chroot had occurred: |
ac13ad10 | 591 | * |
b4235b31 MP |
592 | * @li 1. remove leading "/" (or replace with "." if at end) |
593 | * | |
594 | * @li 2. remove leading ".." components (except those allowed by @p reldir) | |
595 | * | |
596 | * @li 3. delete any other "<dir>/.." (recursively) | |
ac13ad10 | 597 | * |
79452d46 | 598 | * Can only shrink paths, so sanitizes in place. |
ac13ad10 | 599 | * |
b5f9e67d | 600 | * While we're at it, remove double slashes and "." components like |
b4235b31 | 601 | * clean_fname() does, but DON'T remove a trailing slash because that |
b5f9e67d | 602 | * is sometimes significant on command line arguments. |
ac13ad10 | 603 | * |
b4235b31 | 604 | * If @p reldir is non-null, it is a sanitized directory that the path will be |
79452d46 DD |
605 | * relative to, so allow as many ".." at the beginning of the path as |
606 | * there are components in reldir. This is used for symbolic link targets. | |
607 | * If reldir is non-null and the path began with "/", to be completely like | |
608 | * a chroot we should add in depth levels of ".." at the beginning of the | |
609 | * path, but that would blow the assumption that the path doesn't grow and | |
610 | * it is not likely to end up being a valid symlink anyway, so just do | |
611 | * the normal removal of the leading "/" instead. | |
ac13ad10 | 612 | * |
1b8e662a DD |
613 | * Contributed by Dave Dykstra <dwd@bell-labs.com> |
614 | */ | |
cb13abfe | 615 | void sanitize_path(char *p, char *reldir) |
1b8e662a | 616 | { |
44e2e578 | 617 | char *start, *sanp; |
cb13abfe DD |
618 | int depth = 0; |
619 | int allowdotdot = 0; | |
620 | ||
621 | if (reldir) { | |
622 | depth++; | |
623 | while (*reldir) { | |
624 | if (*reldir++ == '/') { | |
625 | depth++; | |
626 | } | |
627 | } | |
628 | } | |
44e2e578 DD |
629 | start = p; |
630 | sanp = p; | |
b5f9e67d DD |
631 | while (*p == '/') { |
632 | /* remove leading slashes */ | |
633 | p++; | |
634 | } | |
1b8e662a | 635 | while (*p != '\0') { |
b5f9e67d | 636 | /* this loop iterates once per filename component in p. |
44e2e578 | 637 | * both p (and sanp if the original had a slash) should |
b5f9e67d DD |
638 | * always be left pointing after a slash |
639 | */ | |
640 | if ((*p == '.') && ((*(p+1) == '/') || (*(p+1) == '\0'))) { | |
641 | /* skip "." component */ | |
642 | while (*++p == '/') { | |
643 | /* skip following slashes */ | |
644 | ; | |
645 | } | |
cb13abfe DD |
646 | continue; |
647 | } | |
648 | allowdotdot = 0; | |
649 | if ((*p == '.') && (*(p+1) == '.') && | |
1b8e662a | 650 | ((*(p+2) == '/') || (*(p+2) == '\0'))) { |
cb13abfe DD |
651 | /* ".." component followed by slash or end */ |
652 | if ((depth > 0) && (sanp == start)) { | |
653 | /* allow depth levels of .. at the beginning */ | |
654 | --depth; | |
655 | allowdotdot = 1; | |
656 | } else { | |
657 | p += 2; | |
658 | if (*p == '/') | |
659 | p++; | |
660 | if (sanp != start) { | |
661 | /* back up sanp one level */ | |
662 | --sanp; /* now pointing at slash */ | |
663 | while ((sanp > start) && (*(sanp - 1) != '/')) { | |
664 | /* skip back up to slash */ | |
665 | sanp--; | |
666 | } | |
b5f9e67d | 667 | } |
cb13abfe | 668 | continue; |
1b8e662a | 669 | } |
cb13abfe DD |
670 | } |
671 | while (1) { | |
672 | /* copy one component through next slash */ | |
673 | *sanp++ = *p++; | |
674 | if ((*p == '\0') || (*(p-1) == '/')) { | |
675 | while (*p == '/') { | |
676 | /* skip multiple slashes */ | |
677 | p++; | |
b5f9e67d | 678 | } |
cb13abfe | 679 | break; |
1b8e662a DD |
680 | } |
681 | } | |
cb13abfe DD |
682 | if (allowdotdot) { |
683 | /* move the virtual beginning to leave the .. alone */ | |
684 | start = sanp; | |
685 | } | |
1b8e662a | 686 | } |
cb13abfe | 687 | if ((sanp == start) && !allowdotdot) { |
b5f9e67d | 688 | /* ended up with nothing, so put in "." component */ |
79452d46 DD |
689 | /* |
690 | * note that the !allowdotdot doesn't prevent this from | |
691 | * happening in all allowed ".." situations, but I didn't | |
692 | * think it was worth putting in an extra variable to ensure | |
693 | * it since an extra "." won't hurt in those situations. | |
694 | */ | |
44e2e578 | 695 | *sanp++ = '.'; |
b5f9e67d | 696 | } |
44e2e578 | 697 | *sanp = '\0'; |
1b8e662a DD |
698 | } |
699 | ||
5243c216 AT |
700 | |
701 | static char curr_dir[MAXPATHLEN]; | |
702 | ||
4e5db0ad MP |
703 | /** |
704 | * Like chdir() but can be reversed with pop_dir() if @p save is set. | |
705 | * It is also much faster as it remembers where we have been. | |
706 | **/ | |
5243c216 AT |
707 | char *push_dir(char *dir, int save) |
708 | { | |
709 | char *ret = curr_dir; | |
710 | static int initialised; | |
711 | ||
712 | if (!initialised) { | |
713 | initialised = 1; | |
714 | getcwd(curr_dir, sizeof(curr_dir)-1); | |
715 | } | |
716 | ||
c226b7c2 DD |
717 | if (!dir) return NULL; /* this call was probably just to initialize */ |
718 | ||
5243c216 AT |
719 | if (chdir(dir)) return NULL; |
720 | ||
721 | if (save) { | |
722 | ret = strdup(curr_dir); | |
723 | } | |
724 | ||
725 | if (*dir == '/') { | |
37f9805d | 726 | strlcpy(curr_dir, dir, sizeof(curr_dir)); |
5243c216 | 727 | } else { |
37f9805d AT |
728 | strlcat(curr_dir,"/", sizeof(curr_dir)); |
729 | strlcat(curr_dir,dir, sizeof(curr_dir)); | |
5243c216 AT |
730 | } |
731 | ||
732 | clean_fname(curr_dir); | |
733 | ||
734 | return ret; | |
735 | } | |
736 | ||
4e5db0ad | 737 | /** Reverse a push_dir() call */ |
5243c216 AT |
738 | int pop_dir(char *dir) |
739 | { | |
740 | int ret; | |
741 | ||
742 | ret = chdir(dir); | |
743 | if (ret) { | |
744 | free(dir); | |
745 | return ret; | |
746 | } | |
747 | ||
37f9805d | 748 | strlcpy(curr_dir, dir, sizeof(curr_dir)); |
5243c216 AT |
749 | |
750 | free(dir); | |
751 | ||
752 | return 0; | |
753 | } | |
aa9b77a5 | 754 | |
ac13ad10 | 755 | /** We need to supply our own strcmp function for file list comparisons |
aa9b77a5 AT |
756 | to ensure that signed/unsigned usage is consistent between machines. */ |
757 | int u_strcmp(const char *cs1, const char *cs2) | |
758 | { | |
5a788ade AT |
759 | const uchar *s1 = (const uchar *)cs1; |
760 | const uchar *s2 = (const uchar *)cs2; | |
aa9b77a5 AT |
761 | |
762 | while (*s1 && *s2 && (*s1 == *s2)) { | |
763 | s1++; s2++; | |
764 | } | |
765 | ||
766 | return (int)*s1 - (int)*s2; | |
767 | } | |
eb86d661 | 768 | |
4b957c22 | 769 | |
ac13ad10 MP |
770 | |
771 | /** | |
772 | * Determine if a symlink points outside the current directory tree. | |
036e70b0 MP |
773 | * This is considered "unsafe" because e.g. when mirroring somebody |
774 | * else's machine it might allow them to establish a symlink to | |
775 | * /etc/passwd, and then read it through a web server. | |
776 | * | |
4e5db0ad MP |
777 | * Null symlinks and absolute symlinks are always unsafe. |
778 | * | |
779 | * Basically here we are concerned with symlinks whose target contains | |
780 | * "..", because this might cause us to walk back up out of the | |
781 | * transferred directory. We are not allowed to go back up and | |
782 | * reenter. | |
783 | * | |
036e70b0 MP |
784 | * @param dest Target of the symlink in question. |
785 | * | |
25d34a5c | 786 | * @param src Top source directory currently applicable. Basically this |
036e70b0 | 787 | * is the first parameter to rsync in a simple invocation, but it's |
25d34a5c | 788 | * modified by flist.c in slightly complex ways. |
036e70b0 MP |
789 | * |
790 | * @retval True if unsafe | |
791 | * @retval False is unsafe | |
4e5db0ad MP |
792 | * |
793 | * @sa t_unsafe.c | |
ac13ad10 | 794 | **/ |
4b957c22 AT |
795 | int unsafe_symlink(char *dest, char *src) |
796 | { | |
797 | char *tok; | |
798 | int depth = 0; | |
799 | ||
800 | /* all absolute and null symlinks are unsafe */ | |
801 | if (!dest || !(*dest) || (*dest == '/')) return 1; | |
802 | ||
803 | src = strdup(src); | |
804 | if (!src) out_of_memory("unsafe_symlink"); | |
805 | ||
806 | /* find out what our safety margin is */ | |
807 | for (tok=strtok(src,"/"); tok; tok=strtok(NULL,"/")) { | |
808 | if (strcmp(tok,"..") == 0) { | |
809 | depth=0; | |
810 | } else if (strcmp(tok,".") == 0) { | |
811 | /* nothing */ | |
812 | } else { | |
813 | depth++; | |
814 | } | |
815 | } | |
816 | free(src); | |
817 | ||
818 | /* drop by one to account for the filename portion */ | |
819 | depth--; | |
820 | ||
821 | dest = strdup(dest); | |
822 | if (!dest) out_of_memory("unsafe_symlink"); | |
823 | ||
824 | for (tok=strtok(dest,"/"); tok; tok=strtok(NULL,"/")) { | |
825 | if (strcmp(tok,"..") == 0) { | |
826 | depth--; | |
827 | } else if (strcmp(tok,".") == 0) { | |
828 | /* nothing */ | |
829 | } else { | |
830 | depth++; | |
831 | } | |
832 | /* if at any point we go outside the current directory then | |
833 | stop - it is unsafe */ | |
834 | if (depth < 0) break; | |
835 | } | |
836 | ||
837 | free(dest); | |
838 | return (depth < 0); | |
839 | } | |
375a4556 | 840 | |
f7632fc6 | 841 | |
ac13ad10 | 842 | /** |
b4235b31 MP |
843 | * Return the date and time as a string |
844 | **/ | |
f7632fc6 AT |
845 | char *timestring(time_t t) |
846 | { | |
847 | static char TimeBuf[200]; | |
848 | struct tm *tm = localtime(&t); | |
849 | ||
850 | #ifdef HAVE_STRFTIME | |
851 | strftime(TimeBuf,sizeof(TimeBuf)-1,"%Y/%m/%d %T",tm); | |
852 | #else | |
37f9805d | 853 | strlcpy(TimeBuf, asctime(tm), sizeof(TimeBuf)); |
f7632fc6 AT |
854 | #endif |
855 | ||
856 | if (TimeBuf[strlen(TimeBuf)-1] == '\n') { | |
857 | TimeBuf[strlen(TimeBuf)-1] = 0; | |
858 | } | |
859 | ||
860 | return(TimeBuf); | |
861 | } | |
862 | ||
9ec16c83 | 863 | |
e1bd49d6 MP |
864 | /** |
865 | * Sleep for a specified number of milliseconds. | |
866 | * | |
867 | * Always returns TRUE. (In the future it might return FALSE if | |
868 | * interrupted.) | |
869 | **/ | |
870 | int msleep(int t) | |
9ec16c83 AT |
871 | { |
872 | int tdiff=0; | |
873 | struct timeval tval,t1,t2; | |
874 | ||
875 | gettimeofday(&t1, NULL); | |
876 | gettimeofday(&t2, NULL); | |
877 | ||
878 | while (tdiff < t) { | |
879 | tval.tv_sec = (t-tdiff)/1000; | |
880 | tval.tv_usec = 1000*((t-tdiff)%1000); | |
881 | ||
882 | errno = 0; | |
883 | select(0,NULL,NULL, NULL, &tval); | |
884 | ||
885 | gettimeofday(&t2, NULL); | |
886 | tdiff = (t2.tv_sec - t1.tv_sec)*1000 + | |
887 | (t2.tv_usec - t1.tv_usec)/1000; | |
888 | } | |
e1bd49d6 MP |
889 | |
890 | return True; | |
9ec16c83 AT |
891 | } |
892 | ||
893 | ||
ac13ad10 MP |
894 | /** |
895 | * Determine if two file modification times are equivalent (either | |
896 | * exact or in the modification timestamp window established by | |
897 | * --modify-window). | |
898 | * | |
899 | * @retval 0 if the times should be treated as the same | |
900 | * | |
901 | * @retval +1 if the first is later | |
902 | * | |
903 | * @retval -1 if the 2nd is later | |
904 | **/ | |
5b56cc19 AT |
905 | int cmp_modtime(time_t file1, time_t file2) |
906 | { | |
5b56cc19 AT |
907 | extern int modify_window; |
908 | ||
909 | if (file2 > file1) { | |
910 | if (file2 - file1 <= modify_window) return 0; | |
911 | return -1; | |
912 | } | |
913 | if (file1 - file2 <= modify_window) return 0; | |
914 | return 1; | |
915 | } | |
916 | ||
917 | ||
918 | #ifdef __INSURE__XX | |
0f8f98c8 AT |
919 | #include <dlfcn.h> |
920 | ||
ac13ad10 MP |
921 | /** |
922 | This routine is a trick to immediately catch errors when debugging | |
923 | with insure. A xterm with a gdb is popped up when insure catches | |
924 | a error. It is Linux specific. | |
925 | **/ | |
0f8f98c8 AT |
926 | int _Insure_trap_error(int a1, int a2, int a3, int a4, int a5, int a6) |
927 | { | |
928 | static int (*fn)(); | |
929 | int ret; | |
8950ac03 | 930 | char *cmd; |
0f8f98c8 | 931 | |
8950ac03 | 932 | asprintf(&cmd, "/usr/X11R6/bin/xterm -display :0 -T Panic -n Panic -e /bin/sh -c 'cat /tmp/ierrs.*.%d ; gdb /proc/%d/exe %d'", |
0f8f98c8 AT |
933 | getpid(), getpid(), getpid()); |
934 | ||
935 | if (!fn) { | |
936 | static void *h; | |
937 | h = dlopen("/usr/local/parasoft/insure++lite/lib.linux2/libinsure.so", RTLD_LAZY); | |
938 | fn = dlsym(h, "_Insure_trap_error"); | |
939 | } | |
940 | ||
941 | ret = fn(a1, a2, a3, a4, a5, a6); | |
942 | ||
943 | system(cmd); | |
944 | ||
8950ac03 AT |
945 | free(cmd); |
946 | ||
0f8f98c8 AT |
947 | return ret; |
948 | } | |
949 | #endif |