Commit | Line | Data |
---|---|---|
0f78b815 WD |
1 | /* |
2 | * Utility routines used in rsync. | |
5cb37436 | 3 | * |
0f78b815 WD |
4 | * Copyright (C) 1996-2000 Andrew Tridgell |
5 | * Copyright (C) 1996 Paul Mackerras | |
6 | * Copyright (C) 2001, 2002 Martin Pool <mbp@samba.org> | |
d3d07a5e | 7 | * Copyright (C) 2003-2008 Wayne Davison |
5cb37436 | 8 | * |
0ecfbf27 | 9 | * This program is free software; you can redistribute it and/or modify |
8e41b68e WD |
10 | * it under the terms of the GNU General Public License as published by |
11 | * the Free Software Foundation; either version 3 of the License, or | |
12 | * (at your option) any later version. | |
5cb37436 | 13 | * |
0ecfbf27 MP |
14 | * This program 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 | |
17 | * GNU General Public License for more details. | |
5cb37436 | 18 | * |
e7c67065 | 19 | * You should have received a copy of the GNU General Public License along |
4fd842f9 | 20 | * with this program; if not, visit the http://fsf.org website. |
0ecfbf27 | 21 | */ |
c627d613 | 22 | |
c627d613 | 23 | #include "rsync.h" |
1b42f628 | 24 | #include "ifuncs.h" |
5dd14f0c WD |
25 | #include "itypes.h" |
26 | #include "inums.h" | |
c627d613 | 27 | |
bc6ebcd2 WD |
28 | extern int dry_run; |
29 | extern int module_id; | |
30 | extern int modify_window; | |
7e43da81 | 31 | extern int relative_paths; |
e9489cd6 | 32 | extern int preserve_xattrs; |
7c73536c | 33 | extern char *module_dir; |
a8167c66 | 34 | extern unsigned int module_dirlen; |
e9357a2d | 35 | extern mode_t orig_umask; |
a7260c40 | 36 | extern char *partial_dir; |
819bfe45 | 37 | extern struct filter_list_struct daemon_filter_list; |
c7c11a0d | 38 | |
0ecfbf27 MP |
39 | int sanitize_paths = 0; |
40 | ||
a8167c66 WD |
41 | char curr_dir[MAXPATHLEN]; |
42 | unsigned int curr_dir_len; | |
43 | int curr_dir_depth; /* This is only set for a sanitizing daemon. */ | |
44 | ||
0f78b815 | 45 | /* Set a fd into nonblocking mode. */ |
f0359dd0 AT |
46 | void set_nonblocking(int fd) |
47 | { | |
48 | int val; | |
49 | ||
ff530f04 | 50 | if ((val = fcntl(fd, F_GETFL)) == -1) |
f0359dd0 AT |
51 | return; |
52 | if (!(val & NONBLOCK_FLAG)) { | |
53 | val |= NONBLOCK_FLAG; | |
54 | fcntl(fd, F_SETFL, val); | |
55 | } | |
56 | } | |
57 | ||
0f78b815 | 58 | /* Set a fd into blocking mode. */ |
36349ea0 AT |
59 | void set_blocking(int fd) |
60 | { | |
61 | int val; | |
62 | ||
ff530f04 | 63 | if ((val = fcntl(fd, F_GETFL)) == -1) |
36349ea0 AT |
64 | return; |
65 | if (val & NONBLOCK_FLAG) { | |
66 | val &= ~NONBLOCK_FLAG; | |
67 | fcntl(fd, F_SETFL, val); | |
68 | } | |
69 | } | |
70 | ||
ac13ad10 | 71 | /** |
0ecfbf27 MP |
72 | * Create a file descriptor pair - like pipe() but use socketpair if |
73 | * possible (because of blocking issues on pipes). | |
5cb37436 | 74 | * |
0ecfbf27 | 75 | * Always set non-blocking. |
f0359dd0 | 76 | */ |
08f15335 AT |
77 | int fd_pair(int fd[2]) |
78 | { | |
f0359dd0 AT |
79 | int ret; |
80 | ||
4f5b0756 | 81 | #ifdef HAVE_SOCKETPAIR |
f0359dd0 | 82 | ret = socketpair(AF_UNIX, SOCK_STREAM, 0, fd); |
08f15335 | 83 | #else |
f0359dd0 | 84 | ret = pipe(fd); |
08f15335 | 85 | #endif |
f0359dd0 AT |
86 | |
87 | if (ret == 0) { | |
88 | set_nonblocking(fd[0]); | |
89 | set_nonblocking(fd[1]); | |
90 | } | |
0ecfbf27 | 91 | |
f0359dd0 | 92 | return ret; |
08f15335 AT |
93 | } |
94 | ||
0b515981 | 95 | void print_child_argv(const char *prefix, char **cmd) |
5ad0e46f | 96 | { |
0b515981 | 97 | rprintf(FCLIENT, "%s ", prefix); |
5ad0e46f MP |
98 | for (; *cmd; cmd++) { |
99 | /* Look for characters that ought to be quoted. This | |
100 | * is not a great quoting algorithm, but it's | |
101 | * sufficient for a log message. */ | |
102 | if (strspn(*cmd, "abcdefghijklmnopqrstuvwxyz" | |
103 | "ABCDEFGHIJKLMNOPQRSTUVWXYZ" | |
104 | "0123456789" | |
105 | ",.-_=+@/") != strlen(*cmd)) { | |
a3f6dbdf | 106 | rprintf(FCLIENT, "\"%s\" ", *cmd); |
5ad0e46f | 107 | } else { |
a3f6dbdf | 108 | rprintf(FCLIENT, "%s ", *cmd); |
5ad0e46f MP |
109 | } |
110 | } | |
a3f6dbdf | 111 | rprintf(FCLIENT, "\n"); |
5ad0e46f MP |
112 | } |
113 | ||
4a19c3b2 | 114 | NORETURN void out_of_memory(const char *str) |
c627d613 | 115 | { |
2cd421d8 | 116 | rprintf(FERROR, "ERROR: out of memory in %s [%s]\n", str, who_am_i()); |
c284f34a | 117 | exit_cleanup(RERR_MALLOC); |
575f2fca AT |
118 | } |
119 | ||
4a19c3b2 | 120 | NORETURN void overflow_exit(const char *str) |
575f2fca | 121 | { |
2cd421d8 | 122 | rprintf(FERROR, "ERROR: buffer overflow in %s [%s]\n", str, who_am_i()); |
c284f34a | 123 | exit_cleanup(RERR_MALLOC); |
c627d613 AT |
124 | } |
125 | ||
4a19c3b2 | 126 | int set_modtime(const char *fname, time_t modtime, mode_t mode) |
c627d613 | 127 | { |
25007999 WD |
128 | #if !defined HAVE_LUTIMES || !defined HAVE_UTIMES |
129 | if (S_ISLNK(mode)) | |
130 | return 1; | |
131 | #endif | |
132 | ||
951e826b | 133 | if (DEBUG_GTE(TIME, 1)) { |
404e813c | 134 | rprintf(FINFO, "set modtime of %s to (%ld) %s", |
785abd48 | 135 | fname, (long)modtime, |
404e813c MP |
136 | asctime(localtime(&modtime))); |
137 | } | |
5cb37436 | 138 | |
15778afb WD |
139 | if (dry_run) |
140 | return 0; | |
141 | ||
31e12522 | 142 | { |
25007999 WD |
143 | #ifdef HAVE_UTIMES |
144 | struct timeval t[2]; | |
145 | t[0].tv_sec = time(NULL); | |
146 | t[0].tv_usec = 0; | |
147 | t[1].tv_sec = modtime; | |
148 | t[1].tv_usec = 0; | |
149 | # ifdef HAVE_LUTIMES | |
149a78e3 | 150 | if (S_ISLNK(mode)) { |
a5bb0902 WD |
151 | if (lutimes(fname, t) < 0) |
152 | return errno == ENOSYS ? 1 : -1; | |
77d4c400 | 153 | return 0; |
149a78e3 | 154 | } |
25007999 WD |
155 | # endif |
156 | return utimes(fname, t); | |
4f9b139a | 157 | #elif defined HAVE_STRUCT_UTIMBUF |
5cb37436 | 158 | struct utimbuf tbuf; |
31e12522 AT |
159 | tbuf.actime = time(NULL); |
160 | tbuf.modtime = modtime; | |
161 | return utime(fname,&tbuf); | |
4f5b0756 | 162 | #elif defined HAVE_UTIME |
31e12522 AT |
163 | time_t t[2]; |
164 | t[0] = time(NULL); | |
165 | t[1] = modtime; | |
166 | return utime(fname,t); | |
c627d613 | 167 | #else |
25007999 | 168 | #error No file-time-modification routine found! |
c627d613 | 169 | #endif |
31e12522 | 170 | } |
c627d613 | 171 | } |
94481d91 | 172 | |
e9357a2d WD |
173 | /* This creates a new directory with default permissions. Since there |
174 | * might be some directory-default permissions affecting this, we can't | |
175 | * force the permissions directly using the original umask and mkdir(). */ | |
176 | int mkdir_defmode(char *fname) | |
177 | { | |
178 | int ret; | |
179 | ||
180 | umask(orig_umask); | |
181 | ret = do_mkdir(fname, ACCESSPERMS); | |
182 | umask(0); | |
183 | ||
184 | return ret; | |
185 | } | |
186 | ||
85c41757 WD |
187 | /* Create any necessary directories in fname. Any missing directories are |
188 | * created with default permissions. */ | |
e9357a2d | 189 | int create_directory_path(char *fname) |
6574b4f7 | 190 | { |
6574b4f7 | 191 | char *p; |
85c41757 | 192 | int ret = 0; |
6574b4f7 | 193 | |
c284f34a WD |
194 | while (*fname == '/') |
195 | fname++; | |
196 | while (strncmp(fname, "./", 2) == 0) | |
197 | fname += 2; | |
6574b4f7 | 198 | |
85c41757 | 199 | umask(orig_umask); |
6574b4f7 | 200 | p = fname; |
c284f34a | 201 | while ((p = strchr(p,'/')) != NULL) { |
85c41757 WD |
202 | *p = '\0'; |
203 | if (do_mkdir(fname, ACCESSPERMS) < 0 && errno != EEXIST) | |
204 | ret = -1; | |
205 | *p++ = '/'; | |
6574b4f7 | 206 | } |
85c41757 WD |
207 | umask(0); |
208 | ||
209 | return ret; | |
6574b4f7 | 210 | } |
950ab32d | 211 | |
ac13ad10 MP |
212 | /** |
213 | * Write @p len bytes at @p ptr to descriptor @p desc, retrying if | |
214 | * interrupted. | |
215 | * | |
216 | * @retval len upon success | |
217 | * | |
218 | * @retval <0 write's (negative) error code | |
219 | * | |
220 | * Derived from GNU C's cccp.c. | |
221 | */ | |
4a19c3b2 | 222 | int full_write(int desc, const char *ptr, size_t len) |
950ab32d AT |
223 | { |
224 | int total_written; | |
5cb37436 | 225 | |
950ab32d AT |
226 | total_written = 0; |
227 | while (len > 0) { | |
5c1b7bfd | 228 | int written = write(desc, ptr, len); |
950ab32d | 229 | if (written < 0) { |
950ab32d AT |
230 | if (errno == EINTR) |
231 | continue; | |
950ab32d AT |
232 | return written; |
233 | } | |
234 | total_written += written; | |
235 | ptr += written; | |
236 | len -= written; | |
237 | } | |
238 | return total_written; | |
239 | } | |
240 | ||
ac13ad10 MP |
241 | /** |
242 | * Read @p len bytes at @p ptr from descriptor @p desc, retrying if | |
243 | * interrupted. | |
244 | * | |
245 | * @retval >0 the actual number of bytes read | |
246 | * | |
247 | * @retval 0 for EOF | |
248 | * | |
249 | * @retval <0 for an error. | |
250 | * | |
251 | * Derived from GNU C's cccp.c. */ | |
9dd891bb | 252 | static int safe_read(int desc, char *ptr, size_t len) |
950ab32d AT |
253 | { |
254 | int n_chars; | |
5cb37436 | 255 | |
9dd891bb | 256 | if (len == 0) |
950ab32d | 257 | return len; |
5cb37436 | 258 | |
950ab32d AT |
259 | do { |
260 | n_chars = read(desc, ptr, len); | |
261 | } while (n_chars < 0 && errno == EINTR); | |
5cb37436 | 262 | |
950ab32d AT |
263 | return n_chars; |
264 | } | |
265 | ||
2cce7545 WD |
266 | /* Copy a file. If ofd < 0, copy_file unlinks and opens the "dest" file. |
267 | * Otherwise, it just writes to and closes the provided file descriptor. | |
e9489cd6 WD |
268 | * In either case, if --xattrs are being preserved, the dest file will |
269 | * have its xattrs set from the source file. | |
ac13ad10 | 270 | * |
3e13004b WD |
271 | * This is used in conjunction with the --temp-dir, --backup, and |
272 | * --copy-dest options. */ | |
2cce7545 WD |
273 | int copy_file(const char *source, const char *dest, int ofd, |
274 | mode_t mode, int create_bak_dir) | |
950ab32d AT |
275 | { |
276 | int ifd; | |
950ab32d AT |
277 | char buf[1024 * 8]; |
278 | int len; /* Number of bytes read into `buf'. */ | |
279 | ||
f5b532b1 | 280 | if ((ifd = do_open(source, O_RDONLY, 0)) < 0) { |
f1ca7c44 | 281 | int save_errno = errno; |
3f0211b6 | 282 | rsyserr(FERROR_XFER, errno, "open %s", full_fname(source)); |
f1ca7c44 | 283 | errno = save_errno; |
950ab32d AT |
284 | return -1; |
285 | } | |
286 | ||
2cce7545 WD |
287 | if (ofd < 0) { |
288 | if (robust_unlink(dest) && errno != ENOENT) { | |
f1ca7c44 | 289 | int save_errno = errno; |
3f0211b6 | 290 | rsyserr(FERROR_XFER, errno, "unlink %s", full_fname(dest)); |
f1ca7c44 | 291 | errno = save_errno; |
2cce7545 WD |
292 | return -1; |
293 | } | |
950ab32d | 294 | |
f1ca7c44 WD |
295 | if ((ofd = do_open(dest, O_WRONLY | O_CREAT | O_TRUNC | O_EXCL, mode)) < 0) { |
296 | int save_errno = errno ? errno : EINVAL; /* 0 paranoia */ | |
297 | if (create_bak_dir && errno == ENOENT && make_bak_dir(dest) == 0) { | |
298 | if ((ofd = do_open(dest, O_WRONLY | O_CREAT | O_TRUNC | O_EXCL, mode)) < 0) | |
299 | save_errno = errno ? errno : save_errno; | |
300 | else | |
301 | save_errno = 0; | |
302 | } | |
303 | if (save_errno) { | |
304 | rsyserr(FERROR_XFER, save_errno, "open %s", full_fname(dest)); | |
305 | close(ifd); | |
306 | errno = save_errno; | |
307 | return -1; | |
308 | } | |
2cce7545 | 309 | } |
950ab32d AT |
310 | } |
311 | ||
5cb37436 | 312 | while ((len = safe_read(ifd, buf, sizeof buf)) > 0) { |
950ab32d | 313 | if (full_write(ofd, buf, len) < 0) { |
f1ca7c44 | 314 | int save_errno = errno; |
3f0211b6 | 315 | rsyserr(FERROR_XFER, errno, "write %s", full_fname(dest)); |
950ab32d AT |
316 | close(ifd); |
317 | close(ofd); | |
f1ca7c44 | 318 | errno = save_errno; |
950ab32d AT |
319 | return -1; |
320 | } | |
321 | } | |
322 | ||
8b602edd | 323 | if (len < 0) { |
f1ca7c44 | 324 | int save_errno = errno; |
3f0211b6 | 325 | rsyserr(FERROR_XFER, errno, "read %s", full_fname(source)); |
8b602edd WD |
326 | close(ifd); |
327 | close(ofd); | |
f1ca7c44 | 328 | errno = save_errno; |
8b602edd WD |
329 | return -1; |
330 | } | |
331 | ||
9f27cd8c | 332 | if (close(ifd) < 0) { |
3f0211b6 | 333 | rsyserr(FWARNING, errno, "close failed on %s", |
d62bcc17 | 334 | full_fname(source)); |
9f27cd8c WD |
335 | } |
336 | ||
337 | if (close(ofd) < 0) { | |
f1ca7c44 | 338 | int save_errno = errno; |
3f0211b6 | 339 | rsyserr(FERROR_XFER, errno, "close failed on %s", |
d62bcc17 | 340 | full_fname(dest)); |
f1ca7c44 | 341 | errno = save_errno; |
9f27cd8c WD |
342 | return -1; |
343 | } | |
950ab32d | 344 | |
e9489cd6 WD |
345 | #ifdef SUPPORT_XATTRS |
346 | if (preserve_xattrs) | |
347 | copy_xattrs(source, dest); | |
348 | #endif | |
349 | ||
950ab32d AT |
350 | return 0; |
351 | } | |
feaa89c4 | 352 | |
c7c11a0d DD |
353 | /* MAX_RENAMES should be 10**MAX_RENAMES_DIGITS */ |
354 | #define MAX_RENAMES_DIGITS 3 | |
355 | #define MAX_RENAMES 1000 | |
356 | ||
ac13ad10 | 357 | /** |
b4235b31 MP |
358 | * Robust unlink: some OS'es (HPUX) refuse to unlink busy files, so |
359 | * rename to <path>/.rsyncNNN instead. | |
360 | * | |
361 | * Note that successive rsync runs will shuffle the filenames around a | |
362 | * bit as long as the file is still busy; this is because this function | |
363 | * does not know if the unlink call is due to a new file coming in, or | |
364 | * --delete trying to remove old .rsyncNNN files, hence it renames it | |
365 | * each time. | |
366 | **/ | |
63cf5ae7 | 367 | int robust_unlink(const char *fname) |
c7c11a0d DD |
368 | { |
369 | #ifndef ETXTBSY | |
370 | return do_unlink(fname); | |
371 | #else | |
372 | static int counter = 1; | |
373 | int rc, pos, start; | |
374 | char path[MAXPATHLEN]; | |
375 | ||
376 | rc = do_unlink(fname); | |
c284f34a | 377 | if (rc == 0 || errno != ETXTBSY) |
c7c11a0d DD |
378 | return rc; |
379 | ||
c284f34a WD |
380 | if ((pos = strlcpy(path, fname, MAXPATHLEN)) >= MAXPATHLEN) |
381 | pos = MAXPATHLEN - 1; | |
c7c11a0d | 382 | |
c284f34a WD |
383 | while (pos > 0 && path[pos-1] != '/') |
384 | pos--; | |
5cb37436 | 385 | pos += strlcpy(path+pos, ".rsync", MAXPATHLEN-pos); |
c7c11a0d DD |
386 | |
387 | if (pos > (MAXPATHLEN-MAX_RENAMES_DIGITS-1)) { | |
388 | errno = ETXTBSY; | |
389 | return -1; | |
390 | } | |
391 | ||
392 | /* start where the last one left off to reduce chance of clashes */ | |
393 | start = counter; | |
394 | do { | |
434c4098 | 395 | snprintf(&path[pos], MAX_RENAMES_DIGITS+1, "%03d", counter); |
c7c11a0d DD |
396 | if (++counter >= MAX_RENAMES) |
397 | counter = 1; | |
c284f34a | 398 | } while ((rc = access(path, 0)) == 0 && counter != start); |
c7c11a0d | 399 | |
951e826b | 400 | if (INFO_GTE(MISC, 1)) { |
3f0211b6 | 401 | rprintf(FWARNING, "renaming %s to %s because of text busy\n", |
785abd48 | 402 | fname, path); |
4791825d | 403 | } |
c7c11a0d DD |
404 | |
405 | /* maybe we should return rename()'s exit status? Nah. */ | |
406 | if (do_rename(fname, path) != 0) { | |
407 | errno = ETXTBSY; | |
408 | return -1; | |
409 | } | |
410 | return 0; | |
411 | #endif | |
412 | } | |
413 | ||
630f548f | 414 | /* Returns 0 on successful rename, 1 if we successfully copied the file |
3ed8eafc WD |
415 | * across filesystems, -2 if copy_file() failed, and -1 on other errors. |
416 | * If partialptr is not NULL and we need to do a copy, copy the file into | |
417 | * the active partial-dir instead of over the destination file. */ | |
4a19c3b2 | 418 | int robust_rename(const char *from, const char *to, const char *partialptr, |
3ed8eafc | 419 | int mode) |
c7c11a0d | 420 | { |
62c9e6b3 WD |
421 | int tries = 4; |
422 | ||
423 | while (tries--) { | |
424 | if (do_rename(from, to) == 0) | |
425 | return 0; | |
426 | ||
427 | switch (errno) { | |
428 | #ifdef ETXTBSY | |
429 | case ETXTBSY: | |
f1ca7c44 WD |
430 | if (robust_unlink(to) != 0) { |
431 | errno = ETXTBSY; | |
62c9e6b3 | 432 | return -1; |
f1ca7c44 WD |
433 | } |
434 | errno = ETXTBSY; | |
62c9e6b3 | 435 | break; |
c7c11a0d | 436 | #endif |
62c9e6b3 | 437 | case EXDEV: |
3ed8eafc WD |
438 | if (partialptr) { |
439 | if (!handle_partial_dir(partialptr,PDIR_CREATE)) | |
0479eb76 | 440 | return -2; |
3ed8eafc WD |
441 | to = partialptr; |
442 | } | |
2cce7545 | 443 | if (copy_file(from, to, -1, mode, 0) != 0) |
62c9e6b3 WD |
444 | return -2; |
445 | do_unlink(from); | |
630f548f | 446 | return 1; |
62c9e6b3 WD |
447 | default: |
448 | return -1; | |
449 | } | |
450 | } | |
451 | return -1; | |
feaa89c4 | 452 | } |
3ba62a83 | 453 | |
3ba62a83 AT |
454 | static pid_t all_pids[10]; |
455 | static int num_pids; | |
456 | ||
4cf64834 | 457 | /** Fork and record the pid of the child. **/ |
3ba62a83 AT |
458 | pid_t do_fork(void) |
459 | { | |
460 | pid_t newpid = fork(); | |
5cb37436 | 461 | |
4cf64834 | 462 | if (newpid != 0 && newpid != -1) { |
3ba62a83 AT |
463 | all_pids[num_pids++] = newpid; |
464 | } | |
465 | return newpid; | |
466 | } | |
467 | ||
4cf64834 MP |
468 | /** |
469 | * Kill all children. | |
470 | * | |
471 | * @todo It would be kind of nice to make sure that they are actually | |
472 | * all our children before we kill them, because their pids may have | |
473 | * been recycled by some other process. Perhaps when we wait for a | |
474 | * child, we should remove it from this array. Alternatively we could | |
475 | * perhaps use process groups, but I think that would not work on | |
476 | * ancient Unix versions that don't support them. | |
477 | **/ | |
3ba62a83 AT |
478 | void kill_all(int sig) |
479 | { | |
480 | int i; | |
4cf64834 MP |
481 | |
482 | for (i = 0; i < num_pids; i++) { | |
483 | /* Let's just be a little careful where we | |
484 | * point that gun, hey? See kill(2) for the | |
485 | * magic caused by negative values. */ | |
486 | pid_t p = all_pids[i]; | |
487 | ||
488 | if (p == getpid()) | |
489 | continue; | |
490 | if (p <= 0) | |
491 | continue; | |
492 | ||
493 | kill(p, sig); | |
3ba62a83 AT |
494 | } |
495 | } | |
9486289c | 496 | |
ac13ad10 | 497 | /** Turn a user name into a uid */ |
7210dbfd | 498 | int name_to_uid(const char *name, uid_t *uid_p) |
8ef4ffd6 AT |
499 | { |
500 | struct passwd *pass; | |
b5bd5542 WD |
501 | if (!name || !*name) |
502 | return 0; | |
7210dbfd WD |
503 | if (!(pass = getpwnam(name))) |
504 | return 0; | |
505 | *uid_p = pass->pw_uid; | |
506 | return 1; | |
8ef4ffd6 AT |
507 | } |
508 | ||
ac13ad10 | 509 | /** Turn a group name into a gid */ |
7210dbfd | 510 | int name_to_gid(const char *name, gid_t *gid_p) |
8ef4ffd6 AT |
511 | { |
512 | struct group *grp; | |
b5bd5542 WD |
513 | if (!name || !*name) |
514 | return 0; | |
7210dbfd WD |
515 | if (!(grp = getgrnam(name))) |
516 | return 0; | |
517 | *gid_p = grp->gr_gid; | |
518 | return 1; | |
8ef4ffd6 AT |
519 | } |
520 | ||
ac13ad10 | 521 | /** Lock a byte range in a open file */ |
31593dd6 | 522 | int lock_range(int fd, int offset, int len) |
0c515f17 | 523 | { |
31593dd6 | 524 | struct flock lock; |
0c515f17 | 525 | |
31593dd6 AT |
526 | lock.l_type = F_WRLCK; |
527 | lock.l_whence = SEEK_SET; | |
528 | lock.l_start = offset; | |
529 | lock.l_len = len; | |
530 | lock.l_pid = 0; | |
5cb37436 | 531 | |
31593dd6 | 532 | return fcntl(fd,F_SETLK,&lock) == 0; |
0c515f17 | 533 | } |
874895d5 | 534 | |
4d30f176 | 535 | #define ENSURE_MEMSPACE(buf, type, sz, req) \ |
bc267e0f WD |
536 | if ((req) > sz && !(buf = realloc_array(buf, type, sz = MAX(sz * 2, req)))) \ |
537 | out_of_memory("glob_expand") | |
4d30f176 WD |
538 | |
539 | static inline void call_glob_match(const char *name, int len, int from_glob, | |
540 | char *arg, int abpos, int fbpos); | |
541 | ||
987a5467 WD |
542 | static struct glob_data { |
543 | char *arg_buf, *filt_buf, **argv; | |
544 | int absize, fbsize, maxargs, argc; | |
545 | } glob; | |
4d30f176 WD |
546 | |
547 | static void glob_match(char *arg, int abpos, int fbpos) | |
4791825d | 548 | { |
4d30f176 WD |
549 | int len; |
550 | char *slash; | |
551 | ||
552 | while (*arg == '.' && arg[1] == '/') { | |
553 | if (fbpos < 0) { | |
bc267e0f | 554 | ENSURE_MEMSPACE(glob.filt_buf, char, glob.fbsize, glob.absize); |
987a5467 | 555 | memcpy(glob.filt_buf, glob.arg_buf, abpos + 1); |
4d30f176 | 556 | fbpos = abpos; |
4791825d | 557 | } |
bc267e0f | 558 | ENSURE_MEMSPACE(glob.arg_buf, char, glob.absize, abpos + 3); |
987a5467 WD |
559 | glob.arg_buf[abpos++] = *arg++; |
560 | glob.arg_buf[abpos++] = *arg++; | |
561 | glob.arg_buf[abpos] = '\0'; | |
4791825d | 562 | } |
4d30f176 WD |
563 | if ((slash = strchr(arg, '/')) != NULL) { |
564 | *slash = '\0'; | |
565 | len = slash - arg; | |
566 | } else | |
567 | len = strlen(arg); | |
568 | if (strpbrk(arg, "*?[")) { | |
569 | struct dirent *di; | |
570 | DIR *d; | |
571 | ||
987a5467 | 572 | if (!(d = opendir(abpos ? glob.arg_buf : "."))) |
4d30f176 WD |
573 | return; |
574 | while ((di = readdir(d)) != NULL) { | |
575 | char *dname = d_name(di); | |
576 | if (dname[0] == '.' && (dname[1] == '\0' | |
577 | || (dname[1] == '.' && dname[2] == '\0'))) | |
578 | continue; | |
579 | if (!wildmatch(arg, dname)) | |
580 | continue; | |
581 | call_glob_match(dname, strlen(dname), 1, | |
582 | slash ? arg + len + 1 : NULL, | |
583 | abpos, fbpos); | |
584 | } | |
585 | closedir(d); | |
586 | } else { | |
587 | call_glob_match(arg, len, 0, | |
588 | slash ? arg + len + 1 : NULL, | |
589 | abpos, fbpos); | |
590 | } | |
591 | if (slash) | |
592 | *slash = '/'; | |
4791825d | 593 | } |
874895d5 | 594 | |
4d30f176 WD |
595 | static inline void call_glob_match(const char *name, int len, int from_glob, |
596 | char *arg, int abpos, int fbpos) | |
874895d5 | 597 | { |
4d30f176 WD |
598 | char *use_buf; |
599 | ||
987a5467 WD |
600 | ENSURE_MEMSPACE(glob.arg_buf, char, glob.absize, abpos + len + 2); |
601 | memcpy(glob.arg_buf + abpos, name, len); | |
4d30f176 | 602 | abpos += len; |
987a5467 | 603 | glob.arg_buf[abpos] = '\0'; |
4d30f176 WD |
604 | |
605 | if (fbpos >= 0) { | |
987a5467 WD |
606 | ENSURE_MEMSPACE(glob.filt_buf, char, glob.fbsize, fbpos + len + 2); |
607 | memcpy(glob.filt_buf + fbpos, name, len); | |
4d30f176 | 608 | fbpos += len; |
987a5467 WD |
609 | glob.filt_buf[fbpos] = '\0'; |
610 | use_buf = glob.filt_buf; | |
4d30f176 | 611 | } else |
987a5467 | 612 | use_buf = glob.arg_buf; |
4d30f176 | 613 | |
6db1db54 | 614 | if (from_glob || (arg && len)) { |
4d30f176 WD |
615 | STRUCT_STAT st; |
616 | int is_dir; | |
617 | ||
b5daf530 WD |
618 | if (do_stat(glob.arg_buf, &st) != 0) |
619 | return; | |
620 | is_dir = S_ISDIR(st.st_mode) != 0; | |
621 | if (arg && !is_dir) | |
622 | return; | |
4d30f176 WD |
623 | |
624 | if (daemon_filter_list.head | |
1df02d13 | 625 | && check_filter(&daemon_filter_list, FLOG, use_buf, is_dir) < 0) |
b5daf530 | 626 | return; |
b7061c82 | 627 | } |
874895d5 | 628 | |
4d30f176 | 629 | if (arg) { |
987a5467 WD |
630 | glob.arg_buf[abpos++] = '/'; |
631 | glob.arg_buf[abpos] = '\0'; | |
4d30f176 | 632 | if (fbpos >= 0) { |
987a5467 WD |
633 | glob.filt_buf[fbpos++] = '/'; |
634 | glob.filt_buf[fbpos] = '\0'; | |
4d30f176 WD |
635 | } |
636 | glob_match(arg, abpos, fbpos); | |
637 | } else { | |
987a5467 WD |
638 | ENSURE_MEMSPACE(glob.argv, char *, glob.maxargs, glob.argc + 1); |
639 | if (!(glob.argv[glob.argc++] = strdup(glob.arg_buf))) | |
4d30f176 WD |
640 | out_of_memory("glob_match"); |
641 | } | |
642 | } | |
643 | ||
644 | /* This routine performs wild-card expansion of the pathname in "arg". Any | |
91f625ce WD |
645 | * daemon-excluded files/dirs will not be matched by the wildcards. Returns 0 |
646 | * if a wild-card string is the only returned item (due to matching nothing). */ | |
647 | int glob_expand(const char *arg, char ***argv_p, int *argc_p, int *maxargs_p) | |
4d30f176 | 648 | { |
91f625ce | 649 | int ret, save_argc; |
4d30f176 | 650 | char *s; |
987a5467 WD |
651 | |
652 | if (!arg) { | |
653 | if (glob.filt_buf) | |
654 | free(glob.filt_buf); | |
655 | free(glob.arg_buf); | |
656 | memset(&glob, 0, sizeof glob); | |
91f625ce | 657 | return -1; |
987a5467 | 658 | } |
e42c9458 | 659 | |
4135d091 | 660 | if (sanitize_paths) |
4d30f176 | 661 | s = sanitize_path(NULL, arg, "", 0, SP_KEEP_DOT_DIRS); |
d48810ba | 662 | else { |
4d30f176 | 663 | s = strdup(arg); |
d48810ba WD |
664 | if (!s) |
665 | out_of_memory("glob_expand"); | |
666 | clean_fname(s, CFN_KEEP_DOT_DIRS | |
667 | | CFN_KEEP_TRAILING_SLASH | |
668 | | CFN_COLLAPSE_DOT_DOT_DIRS); | |
669 | } | |
087bf010 | 670 | |
bc267e0f | 671 | ENSURE_MEMSPACE(glob.arg_buf, char, glob.absize, MAXPATHLEN); |
987a5467 | 672 | *glob.arg_buf = '\0'; |
4d30f176 | 673 | |
987a5467 WD |
674 | glob.argc = save_argc = *argc_p; |
675 | glob.argv = *argv_p; | |
676 | glob.maxargs = *maxargs_p; | |
4d30f176 | 677 | |
bc267e0f | 678 | ENSURE_MEMSPACE(glob.argv, char *, glob.maxargs, 100); |
4d30f176 WD |
679 | |
680 | glob_match(s, 0, -1); | |
681 | ||
682 | /* The arg didn't match anything, so add the failed arg to the list. */ | |
987a5467 WD |
683 | if (glob.argc == save_argc) { |
684 | ENSURE_MEMSPACE(glob.argv, char *, glob.maxargs, glob.argc + 1); | |
685 | glob.argv[glob.argc++] = s; | |
91f625ce WD |
686 | ret = 0; |
687 | } else { | |
4d30f176 | 688 | free(s); |
91f625ce WD |
689 | ret = 1; |
690 | } | |
4d30f176 | 691 | |
987a5467 WD |
692 | *maxargs_p = glob.maxargs; |
693 | *argv_p = glob.argv; | |
694 | *argc_p = glob.argc; | |
91f625ce WD |
695 | |
696 | return ret; | |
874895d5 | 697 | } |
5a96ee05 | 698 | |
4791825d | 699 | /* This routine is only used in daemon mode. */ |
4d30f176 | 700 | void glob_expand_module(char *base1, char *arg, char ***argv_p, int *argc_p, int *maxargs_p) |
087bf010 | 701 | { |
044dc293 | 702 | char *p, *s; |
ba5e128d | 703 | char *base = base1; |
4791825d | 704 | int base_len = strlen(base); |
087bf010 | 705 | |
044dc293 | 706 | if (!arg || !*arg) |
b5bd5542 | 707 | return; |
087bf010 | 708 | |
044dc293 WD |
709 | if (strncmp(arg, base, base_len) == 0) |
710 | arg += base_len; | |
e42c9458 | 711 | |
044dc293 WD |
712 | if (!(arg = strdup(arg))) |
713 | out_of_memory("glob_expand_module"); | |
087bf010 | 714 | |
b5bd5542 | 715 | if (asprintf(&base," %s/", base1) <= 0) |
044dc293 | 716 | out_of_memory("glob_expand_module"); |
4791825d | 717 | base_len++; |
ba5e128d | 718 | |
044dc293 WD |
719 | for (s = arg; *s; s = p + base_len) { |
720 | if ((p = strstr(s, base)) != NULL) | |
b5bd5542 | 721 | *p = '\0'; /* split it at this point */ |
4d30f176 | 722 | glob_expand(s, argv_p, argc_p, maxargs_p); |
b5bd5542 WD |
723 | if (!p) |
724 | break; | |
087bf010 AT |
725 | } |
726 | ||
044dc293 | 727 | free(arg); |
ba5e128d | 728 | free(base); |
087bf010 | 729 | } |
5a96ee05 | 730 | |
ac13ad10 MP |
731 | /** |
732 | * Convert a string to lower case | |
733 | **/ | |
5a96ee05 AT |
734 | void strlower(char *s) |
735 | { | |
736 | while (*s) { | |
2dc7b8bd WD |
737 | if (isUpper(s)) |
738 | *s = toLower(s); | |
5a96ee05 AT |
739 | s++; |
740 | } | |
741 | } | |
e42c9458 | 742 | |
368ad70e WD |
743 | /* Join strings p1 & p2 into "dest" with a guaranteed '/' between them. (If |
744 | * p1 ends with a '/', no extra '/' is inserted.) Returns the length of both | |
a8f7e4b8 WD |
745 | * strings + 1 (if '/' was inserted), regardless of whether the null-terminated |
746 | * string fits into destsize. */ | |
368ad70e WD |
747 | size_t pathjoin(char *dest, size_t destsize, const char *p1, const char *p2) |
748 | { | |
749 | size_t len = strlcpy(dest, p1, destsize); | |
750 | if (len < destsize - 1) { | |
751 | if (!len || dest[len-1] != '/') | |
752 | dest[len++] = '/'; | |
753 | if (len < destsize - 1) | |
754 | len += strlcpy(dest + len, p2, destsize - len); | |
755 | else { | |
756 | dest[len] = '\0'; | |
757 | len += strlen(p2); | |
758 | } | |
759 | } | |
760 | else | |
761 | len += strlen(p2) + 1; /* Assume we'd insert a '/'. */ | |
762 | return len; | |
763 | } | |
764 | ||
765 | /* Join any number of strings together, putting them in "dest". The return | |
a8f7e4b8 WD |
766 | * value is the length of all the strings, regardless of whether the null- |
767 | * terminated whole fits in destsize. Your list of string pointers must end | |
768 | * with a NULL to indicate the end of the list. */ | |
368ad70e WD |
769 | size_t stringjoin(char *dest, size_t destsize, ...) |
770 | { | |
5cb37436 | 771 | va_list ap; |
368ad70e WD |
772 | size_t len, ret = 0; |
773 | const char *src; | |
774 | ||
775 | va_start(ap, destsize); | |
776 | while (1) { | |
777 | if (!(src = va_arg(ap, const char *))) | |
778 | break; | |
779 | len = strlen(src); | |
780 | ret += len; | |
781 | if (destsize > 1) { | |
782 | if (len >= destsize) | |
783 | len = destsize - 1; | |
784 | memcpy(dest, src, len); | |
785 | destsize -= len; | |
786 | dest += len; | |
787 | } | |
788 | } | |
789 | *dest = '\0'; | |
790 | va_end(ap); | |
791 | ||
792 | return ret; | |
793 | } | |
794 | ||
1d6b8f9a WD |
795 | int count_dir_elements(const char *p) |
796 | { | |
797 | int cnt = 0, new_component = 1; | |
798 | while (*p) { | |
799 | if (*p++ == '/') | |
a8167c66 | 800 | new_component = (*p != '.' || (p[1] != '/' && p[1] != '\0')); |
1d6b8f9a WD |
801 | else if (new_component) { |
802 | new_component = 0; | |
803 | cnt++; | |
804 | } | |
805 | } | |
806 | return cnt; | |
807 | } | |
808 | ||
d48810ba WD |
809 | /* Turns multiple adjacent slashes into a single slash, drops all leading or |
810 | * interior "." elements unless CFN_KEEP_DOT_DIRS is flagged. Will also drop | |
811 | * a trailing '.' after a '/' if CFN_DROP_TRAILING_DOT_DIR is flagged, removes | |
812 | * a trailing slash (perhaps after removing the aforementioned dot) unless | |
813 | * CFN_KEEP_TRAILING_SLASH is flagged, and will also collapse ".." elements | |
814 | * (except at the start) if CFN_COLLAPSE_DOT_DOT_DIRS is flagged. If the | |
815 | * resulting name would be empty, returns ".". */ | |
6bb82fe0 | 816 | unsigned int clean_fname(char *name, int flags) |
5243c216 | 817 | { |
e012b94f | 818 | char *limit = name - 1, *t = name, *f = name; |
ebdd24d6 | 819 | int anchored; |
5243c216 | 820 | |
b5bd5542 | 821 | if (!name) |
3104620c | 822 | return 0; |
5243c216 | 823 | |
ebdd24d6 WD |
824 | if ((anchored = *f == '/') != 0) |
825 | *t++ = *f++; | |
d48810ba | 826 | else if (flags & CFN_KEEP_DOT_DIRS && *f == '.' && f[1] == '/') { |
6bb82fe0 WD |
827 | *t++ = *f++; |
828 | *t++ = *f++; | |
829 | } | |
ebdd24d6 WD |
830 | while (*f) { |
831 | /* discard extra slashes */ | |
832 | if (*f == '/') { | |
833 | f++; | |
834 | continue; | |
5243c216 | 835 | } |
ebdd24d6 | 836 | if (*f == '.') { |
6bb82fe0 | 837 | /* discard interior "." dirs */ |
d48810ba | 838 | if (f[1] == '/' && !(flags & CFN_KEEP_DOT_DIRS)) { |
e012b94f | 839 | f += 2; |
ebdd24d6 WD |
840 | continue; |
841 | } | |
6bb82fe0 WD |
842 | if (f[1] == '\0' && flags & CFN_DROP_TRAILING_DOT_DIR) |
843 | break; | |
ebdd24d6 | 844 | /* collapse ".." dirs */ |
6bb82fe0 WD |
845 | if (flags & CFN_COLLAPSE_DOT_DOT_DIRS |
846 | && f[1] == '.' && (f[2] == '/' || !f[2])) { | |
ebdd24d6 WD |
847 | char *s = t - 1; |
848 | if (s == name && anchored) { | |
849 | f += 2; | |
850 | continue; | |
851 | } | |
852 | while (s > limit && *--s != '/') {} | |
e012b94f | 853 | if (s != t - 1 && (s < name || *s == '/')) { |
ebdd24d6 WD |
854 | t = s + 1; |
855 | f += 2; | |
856 | continue; | |
857 | } | |
f55c2dfc | 858 | limit = t + 2; |
5243c216 AT |
859 | } |
860 | } | |
ebdd24d6 | 861 | while (*f && (*t++ = *f++) != '/') {} |
5243c216 | 862 | } |
ebdd24d6 | 863 | |
6bb82fe0 | 864 | if (t > name+anchored && t[-1] == '/' && !(flags & CFN_KEEP_TRAILING_SLASH)) |
ebdd24d6 WD |
865 | t--; |
866 | if (t == name) | |
867 | *t++ = '.'; | |
868 | *t = '\0'; | |
3104620c WD |
869 | |
870 | return t - name; | |
5243c216 AT |
871 | } |
872 | ||
84a63795 WD |
873 | /* Make path appear as if a chroot had occurred. This handles a leading |
874 | * "/" (either removing it or expanding it) and any leading or embedded | |
875 | * ".." components that attempt to escape past the module's top dir. | |
b4235b31 | 876 | * |
1d6b8f9a WD |
877 | * If dest is NULL, a buffer is allocated to hold the result. It is legal |
878 | * to call with the dest and the path (p) pointing to the same buffer, but | |
879 | * rootdir will be ignored to avoid expansion of the string. | |
b4235b31 | 880 | * |
1d6b8f9a | 881 | * The rootdir string contains a value to use in place of a leading slash. |
7c73536c | 882 | * Specify NULL to get the default of "module_dir". |
ac13ad10 | 883 | * |
a8167c66 | 884 | * The depth var is a count of how many '..'s to allow at the start of the |
29bca53f | 885 | * path. |
ac13ad10 | 886 | * |
b92693da | 887 | * We also clean the path in a manner similar to clean_fname() but with a |
0f78b815 | 888 | * few differences: |
b92693da WD |
889 | * |
890 | * Turns multiple adjacent slashes into a single slash, gets rid of "." dir | |
891 | * elements (INCLUDING a trailing dot dir), PRESERVES a trailing slash, and | |
892 | * ALWAYS collapses ".." elements (except for those at the start of the | |
893 | * string up to "depth" deep). If the resulting name would be empty, | |
894 | * change it into a ".". */ | |
d48810ba WD |
895 | char *sanitize_path(char *dest, const char *p, const char *rootdir, int depth, |
896 | int flags) | |
1b8e662a | 897 | { |
29bca53f | 898 | char *start, *sanp; |
d48810ba | 899 | int rlen = 0, drop_dot_dirs = !relative_paths || !(flags & SP_KEEP_DOT_DIRS); |
84a63795 WD |
900 | |
901 | if (dest != p) { | |
902 | int plen = strlen(p); | |
1d6b8f9a WD |
903 | if (*p == '/') { |
904 | if (!rootdir) | |
7c73536c | 905 | rootdir = module_dir; |
1d6b8f9a WD |
906 | rlen = strlen(rootdir); |
907 | depth = 0; | |
84a63795 WD |
908 | p++; |
909 | } | |
910 | if (dest) { | |
911 | if (rlen + plen + 1 >= MAXPATHLEN) | |
912 | return NULL; | |
913 | } else if (!(dest = new_array(char, rlen + plen + 1))) | |
914 | out_of_memory("sanitize_path"); | |
915 | if (rlen) { | |
1d6b8f9a | 916 | memcpy(dest, rootdir, rlen); |
84a63795 WD |
917 | if (rlen > 1) |
918 | dest[rlen++] = '/'; | |
919 | } | |
920 | } | |
cb13abfe | 921 | |
d48810ba WD |
922 | if (drop_dot_dirs) { |
923 | while (*p == '.' && p[1] == '/') | |
924 | p += 2; | |
925 | } | |
926 | ||
84a63795 | 927 | start = sanp = dest + rlen; |
d2f6e192 WD |
928 | /* This loop iterates once per filename component in p, pointing at |
929 | * the start of the name (past any prior slash) for each iteration. */ | |
29bca53f | 930 | while (*p) { |
2d41264e WD |
931 | /* discard leading or extra slashes */ |
932 | if (*p == '/') { | |
933 | p++; | |
934 | continue; | |
935 | } | |
d48810ba WD |
936 | if (drop_dot_dirs) { |
937 | if (*p == '.' && (p[1] == '/' || p[1] == '\0')) { | |
7e43da81 WD |
938 | /* skip "." component */ |
939 | p++; | |
940 | continue; | |
941 | } | |
cb13abfe | 942 | } |
c284f34a | 943 | if (*p == '.' && p[1] == '.' && (p[2] == '/' || p[2] == '\0')) { |
cb13abfe | 944 | /* ".." component followed by slash or end */ |
8e5f029e WD |
945 | if (depth <= 0 || sanp != start) { |
946 | p += 2; | |
947 | if (sanp != start) { | |
948 | /* back up sanp one level */ | |
949 | --sanp; /* now pointing at slash */ | |
d48810ba | 950 | while (sanp > start && sanp[-1] != '/') |
8e5f029e | 951 | sanp--; |
b5f9e67d | 952 | } |
8e5f029e | 953 | continue; |
1b8e662a | 954 | } |
8e5f029e WD |
955 | /* allow depth levels of .. at the beginning */ |
956 | depth--; | |
957 | /* move the virtual beginning to leave the .. alone */ | |
958 | start = sanp + 3; | |
1b8e662a | 959 | } |
2d41264e WD |
960 | /* copy one component through next slash */ |
961 | while (*p && (*sanp++ = *p++) != '/') {} | |
1b8e662a | 962 | } |
84a63795 | 963 | if (sanp == dest) { |
b5f9e67d | 964 | /* ended up with nothing, so put in "." component */ |
44e2e578 | 965 | *sanp++ = '.'; |
b5f9e67d | 966 | } |
44e2e578 | 967 | *sanp = '\0'; |
1b8e662a | 968 | |
84a63795 | 969 | return dest; |
14b61c63 | 970 | } |
5243c216 | 971 | |
a8167c66 | 972 | /* Like chdir(), but it keeps track of the current directory (in the |
a16d8f2b | 973 | * global "curr_dir"), and ensures that the path size doesn't overflow. |
a8167c66 | 974 | * Also cleans the path using the clean_fname() function. */ |
29a89172 | 975 | int change_dir(const char *dir, int set_path_only) |
5243c216 | 976 | { |
5243c216 | 977 | static int initialised; |
4af8fe4e | 978 | unsigned int len; |
5243c216 AT |
979 | |
980 | if (!initialised) { | |
981 | initialised = 1; | |
5cb37436 | 982 | getcwd(curr_dir, sizeof curr_dir - 1); |
4af8fe4e | 983 | curr_dir_len = strlen(curr_dir); |
5243c216 AT |
984 | } |
985 | ||
4af8fe4e WD |
986 | if (!dir) /* this call was probably just to initialize */ |
987 | return 0; | |
c226b7c2 | 988 | |
4af8fe4e WD |
989 | len = strlen(dir); |
990 | if (len == 1 && *dir == '.') | |
991 | return 1; | |
5243c216 | 992 | |
5243c216 | 993 | if (*dir == '/') { |
29a89172 WD |
994 | if (len >= sizeof curr_dir) { |
995 | errno = ENAMETOOLONG; | |
996 | return 0; | |
997 | } | |
998 | if (!set_path_only && chdir(dir)) | |
999 | return 0; | |
4af8fe4e | 1000 | memcpy(curr_dir, dir, len + 1); |
4af8fe4e | 1001 | } else { |
29a89172 WD |
1002 | if (curr_dir_len + 1 + len >= sizeof curr_dir) { |
1003 | errno = ENAMETOOLONG; | |
1004 | return 0; | |
1005 | } | |
1006 | curr_dir[curr_dir_len] = '/'; | |
1007 | memcpy(curr_dir + curr_dir_len + 1, dir, len + 1); | |
1008 | ||
1009 | if (!set_path_only && chdir(curr_dir)) { | |
1010 | curr_dir[curr_dir_len] = '\0'; | |
1011 | return 0; | |
1012 | } | |
5243c216 AT |
1013 | } |
1014 | ||
6bb82fe0 | 1015 | curr_dir_len = clean_fname(curr_dir, CFN_COLLAPSE_DOT_DOT_DIRS); |
a8167c66 WD |
1016 | if (sanitize_paths) { |
1017 | if (module_dirlen > curr_dir_len) | |
1018 | module_dirlen = curr_dir_len; | |
1019 | curr_dir_depth = count_dir_elements(curr_dir + module_dirlen); | |
1020 | } | |
5243c216 | 1021 | |
951e826b | 1022 | if (DEBUG_GTE(CHDIR, 1) && !set_path_only) |
29a89172 | 1023 | rprintf(FINFO, "[%s] change_dir(%s)\n", who_am_i(), curr_dir); |
beef86d0 | 1024 | |
4af8fe4e | 1025 | return 1; |
5243c216 | 1026 | } |
aa9b77a5 | 1027 | |
eb61be19 WD |
1028 | /** |
1029 | * Return a quoted string with the full pathname of the indicated filename. | |
1030 | * The string " (in MODNAME)" may also be appended. The returned pointer | |
1031 | * remains valid until the next time full_fname() is called. | |
1032 | **/ | |
9a5ade18 | 1033 | char *full_fname(const char *fn) |
eb61be19 | 1034 | { |
eb61be19 WD |
1035 | static char *result = NULL; |
1036 | char *m1, *m2, *m3; | |
1037 | char *p1, *p2; | |
1038 | ||
1039 | if (result) | |
1040 | free(result); | |
1041 | ||
1042 | if (*fn == '/') | |
1043 | p1 = p2 = ""; | |
1044 | else { | |
4cff5fa4 | 1045 | p1 = curr_dir + module_dirlen; |
bc83274a WD |
1046 | for (p2 = p1; *p2 == '/'; p2++) {} |
1047 | if (*p2) | |
1048 | p2 = "/"; | |
eb61be19 WD |
1049 | } |
1050 | if (module_id >= 0) { | |
1051 | m1 = " (in "; | |
1052 | m2 = lp_name(module_id); | |
1053 | m3 = ")"; | |
eb61be19 WD |
1054 | } else |
1055 | m1 = m2 = m3 = ""; | |
1056 | ||
c98ad3df WD |
1057 | if (asprintf(&result, "\"%s%s%s\"%s%s%s", p1, p2, fn, m1, m2, m3) <= 0) |
1058 | out_of_memory("full_fname"); | |
eb61be19 WD |
1059 | |
1060 | return result; | |
1061 | } | |
1062 | ||
a7260c40 WD |
1063 | static char partial_fname[MAXPATHLEN]; |
1064 | ||
1065 | char *partial_dir_fname(const char *fname) | |
1066 | { | |
1067 | char *t = partial_fname; | |
1068 | int sz = sizeof partial_fname; | |
1069 | const char *fn; | |
1070 | ||
1071 | if ((fn = strrchr(fname, '/')) != NULL) { | |
1072 | fn++; | |
1073 | if (*partial_dir != '/') { | |
1074 | int len = fn - fname; | |
1075 | strncpy(t, fname, len); /* safe */ | |
1076 | t += len; | |
1077 | sz -= len; | |
1078 | } | |
1079 | } else | |
1080 | fn = fname; | |
1081 | if ((int)pathjoin(t, sz, partial_dir, fn) >= sz) | |
1082 | return NULL; | |
819bfe45 | 1083 | if (daemon_filter_list.head) { |
89363676 WD |
1084 | t = strrchr(partial_fname, '/'); |
1085 | *t = '\0'; | |
1df02d13 | 1086 | if (check_filter(&daemon_filter_list, FLOG, partial_fname, 1) < 0) |
5aa7b20a | 1087 | return NULL; |
89363676 | 1088 | *t = '/'; |
1df02d13 | 1089 | if (check_filter(&daemon_filter_list, FLOG, partial_fname, 0) < 0) |
5aa7b20a WD |
1090 | return NULL; |
1091 | } | |
a7260c40 WD |
1092 | |
1093 | return partial_fname; | |
1094 | } | |
1095 | ||
1096 | /* If no --partial-dir option was specified, we don't need to do anything | |
1097 | * (the partial-dir is essentially '.'), so just return success. */ | |
1098 | int handle_partial_dir(const char *fname, int create) | |
1099 | { | |
1100 | char *fn, *dir; | |
1101 | ||
1102 | if (fname != partial_fname) | |
1103 | return 1; | |
1104 | if (!create && *partial_dir == '/') | |
1105 | return 1; | |
1106 | if (!(fn = strrchr(partial_fname, '/'))) | |
1107 | return 1; | |
1108 | ||
1109 | *fn = '\0'; | |
1110 | dir = partial_fname; | |
1111 | if (create) { | |
1112 | STRUCT_STAT st; | |
a7260c40 | 1113 | int statret = do_lstat(dir, &st); |
a7260c40 | 1114 | if (statret == 0 && !S_ISDIR(st.st_mode)) { |
0479eb76 WD |
1115 | if (do_unlink(dir) < 0) { |
1116 | *fn = '/'; | |
a7260c40 | 1117 | return 0; |
0479eb76 | 1118 | } |
a7260c40 WD |
1119 | statret = -1; |
1120 | } | |
0479eb76 WD |
1121 | if (statret < 0 && do_mkdir(dir, 0700) < 0) { |
1122 | *fn = '/'; | |
a7260c40 | 1123 | return 0; |
0479eb76 | 1124 | } |
a7260c40 WD |
1125 | } else |
1126 | do_rmdir(dir); | |
1127 | *fn = '/'; | |
1128 | ||
1129 | return 1; | |
1130 | } | |
1131 | ||
ac13ad10 MP |
1132 | /** |
1133 | * Determine if a symlink points outside the current directory tree. | |
036e70b0 MP |
1134 | * This is considered "unsafe" because e.g. when mirroring somebody |
1135 | * else's machine it might allow them to establish a symlink to | |
1136 | * /etc/passwd, and then read it through a web server. | |
1137 | * | |
4e5db0ad MP |
1138 | * Null symlinks and absolute symlinks are always unsafe. |
1139 | * | |
1140 | * Basically here we are concerned with symlinks whose target contains | |
1141 | * "..", because this might cause us to walk back up out of the | |
1142 | * transferred directory. We are not allowed to go back up and | |
1143 | * reenter. | |
1144 | * | |
036e70b0 MP |
1145 | * @param dest Target of the symlink in question. |
1146 | * | |
25d34a5c | 1147 | * @param src Top source directory currently applicable. Basically this |
036e70b0 | 1148 | * is the first parameter to rsync in a simple invocation, but it's |
25d34a5c | 1149 | * modified by flist.c in slightly complex ways. |
036e70b0 MP |
1150 | * |
1151 | * @retval True if unsafe | |
1152 | * @retval False is unsafe | |
4e5db0ad MP |
1153 | * |
1154 | * @sa t_unsafe.c | |
ac13ad10 | 1155 | **/ |
7afa3a4a | 1156 | int unsafe_symlink(const char *dest, const char *src) |
4b957c22 | 1157 | { |
7afa3a4a | 1158 | const char *name, *slash; |
4b957c22 AT |
1159 | int depth = 0; |
1160 | ||
1161 | /* all absolute and null symlinks are unsafe */ | |
b5bd5542 WD |
1162 | if (!dest || !*dest || *dest == '/') |
1163 | return 1; | |
4b957c22 AT |
1164 | |
1165 | /* find out what our safety margin is */ | |
7afa3a4a WD |
1166 | for (name = src; (slash = strchr(name, '/')) != 0; name = slash+1) { |
1167 | if (strncmp(name, "../", 3) == 0) { | |
c284f34a | 1168 | depth = 0; |
7afa3a4a | 1169 | } else if (strncmp(name, "./", 2) == 0) { |
4b957c22 AT |
1170 | /* nothing */ |
1171 | } else { | |
1172 | depth++; | |
1173 | } | |
1174 | } | |
7afa3a4a WD |
1175 | if (strcmp(name, "..") == 0) |
1176 | depth = 0; | |
4b957c22 | 1177 | |
7afa3a4a WD |
1178 | for (name = dest; (slash = strchr(name, '/')) != 0; name = slash+1) { |
1179 | if (strncmp(name, "../", 3) == 0) { | |
1180 | /* if at any point we go outside the current directory | |
1181 | then stop - it is unsafe */ | |
1182 | if (--depth < 0) | |
1183 | return 1; | |
1184 | } else if (strncmp(name, "./", 2) == 0) { | |
4b957c22 AT |
1185 | /* nothing */ |
1186 | } else { | |
1187 | depth++; | |
1188 | } | |
4b957c22 | 1189 | } |
7afa3a4a WD |
1190 | if (strcmp(name, "..") == 0) |
1191 | depth--; | |
4b957c22 | 1192 | |
4b957c22 AT |
1193 | return (depth < 0); |
1194 | } | |
375a4556 | 1195 | |
4a19c3b2 | 1196 | /* Return the date and time as a string. Some callers tweak returned buf. */ |
f7632fc6 AT |
1197 | char *timestring(time_t t) |
1198 | { | |
1199 | static char TimeBuf[200]; | |
1200 | struct tm *tm = localtime(&t); | |
afa73c75 | 1201 | char *p; |
f7632fc6 | 1202 | |
4f5b0756 | 1203 | #ifdef HAVE_STRFTIME |
5cb37436 | 1204 | strftime(TimeBuf, sizeof TimeBuf - 1, "%Y/%m/%d %H:%M:%S", tm); |
f7632fc6 | 1205 | #else |
5cb37436 | 1206 | strlcpy(TimeBuf, asctime(tm), sizeof TimeBuf); |
f7632fc6 AT |
1207 | #endif |
1208 | ||
afa73c75 WD |
1209 | if ((p = strchr(TimeBuf, '\n')) != NULL) |
1210 | *p = '\0'; | |
f7632fc6 | 1211 | |
afa73c75 | 1212 | return TimeBuf; |
f7632fc6 AT |
1213 | } |
1214 | ||
e1bd49d6 MP |
1215 | /** |
1216 | * Sleep for a specified number of milliseconds. | |
1217 | * | |
1218 | * Always returns TRUE. (In the future it might return FALSE if | |
1219 | * interrupted.) | |
1220 | **/ | |
1221 | int msleep(int t) | |
9ec16c83 | 1222 | { |
c284f34a WD |
1223 | int tdiff = 0; |
1224 | struct timeval tval, t1, t2; | |
9ec16c83 AT |
1225 | |
1226 | gettimeofday(&t1, NULL); | |
5cb37436 | 1227 | |
9ec16c83 AT |
1228 | while (tdiff < t) { |
1229 | tval.tv_sec = (t-tdiff)/1000; | |
1230 | tval.tv_usec = 1000*((t-tdiff)%1000); | |
5cb37436 | 1231 | |
9ec16c83 AT |
1232 | errno = 0; |
1233 | select(0,NULL,NULL, NULL, &tval); | |
1234 | ||
1235 | gettimeofday(&t2, NULL); | |
5cb37436 | 1236 | tdiff = (t2.tv_sec - t1.tv_sec)*1000 + |
9ec16c83 AT |
1237 | (t2.tv_usec - t1.tv_usec)/1000; |
1238 | } | |
e1bd49d6 MP |
1239 | |
1240 | return True; | |
9ec16c83 AT |
1241 | } |
1242 | ||
c2b54076 WD |
1243 | /* Determine if two time_t values are equivalent (either exact, or in |
1244 | * the modification timestamp window established by --modify-window). | |
ac13ad10 MP |
1245 | * |
1246 | * @retval 0 if the times should be treated as the same | |
1247 | * | |
1248 | * @retval +1 if the first is later | |
1249 | * | |
1250 | * @retval -1 if the 2nd is later | |
1251 | **/ | |
c2b54076 | 1252 | int cmp_time(time_t file1, time_t file2) |
5b56cc19 | 1253 | { |
5b56cc19 | 1254 | if (file2 > file1) { |
bc6ebcd2 WD |
1255 | if (file2 - file1 <= modify_window) |
1256 | return 0; | |
5b56cc19 AT |
1257 | return -1; |
1258 | } | |
bc6ebcd2 WD |
1259 | if (file1 - file2 <= modify_window) |
1260 | return 0; | |
5b56cc19 AT |
1261 | return 1; |
1262 | } | |
1263 | ||
1264 | ||
1265 | #ifdef __INSURE__XX | |
0f8f98c8 AT |
1266 | #include <dlfcn.h> |
1267 | ||
ac13ad10 MP |
1268 | /** |
1269 | This routine is a trick to immediately catch errors when debugging | |
1270 | with insure. A xterm with a gdb is popped up when insure catches | |
1271 | a error. It is Linux specific. | |
1272 | **/ | |
0f8f98c8 AT |
1273 | int _Insure_trap_error(int a1, int a2, int a3, int a4, int a5, int a6) |
1274 | { | |
1275 | static int (*fn)(); | |
1276 | int ret; | |
8950ac03 | 1277 | char *cmd; |
0f8f98c8 | 1278 | |
5cb37436 | 1279 | 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 |
1280 | getpid(), getpid(), getpid()); |
1281 | ||
1282 | if (!fn) { | |
1283 | static void *h; | |
1284 | h = dlopen("/usr/local/parasoft/insure++lite/lib.linux2/libinsure.so", RTLD_LAZY); | |
1285 | fn = dlsym(h, "_Insure_trap_error"); | |
1286 | } | |
1287 | ||
1288 | ret = fn(a1, a2, a3, a4, a5, a6); | |
1289 | ||
1290 | system(cmd); | |
1291 | ||
8950ac03 AT |
1292 | free(cmd); |
1293 | ||
0f8f98c8 AT |
1294 | return ret; |
1295 | } | |
1296 | #endif | |
58cadc86 | 1297 | |
58cadc86 WD |
1298 | #define MALLOC_MAX 0x40000000 |
1299 | ||
a2dc4d68 | 1300 | void *_new_array(unsigned long num, unsigned int size, int use_calloc) |
58cadc86 WD |
1301 | { |
1302 | if (num >= MALLOC_MAX/size) | |
1303 | return NULL; | |
a2dc4d68 | 1304 | return use_calloc ? calloc(num, size) : malloc(num * size); |
58cadc86 WD |
1305 | } |
1306 | ||
1fe2a353 | 1307 | void *_realloc_array(void *ptr, unsigned int size, size_t num) |
58cadc86 WD |
1308 | { |
1309 | if (num >= MALLOC_MAX/size) | |
1310 | return NULL; | |
58cadc86 WD |
1311 | if (!ptr) |
1312 | return malloc(size * num); | |
1313 | return realloc(ptr, size * num); | |
1314 | } | |
e64ae6d7 WD |
1315 | |
1316 | /* Take a filename and filename length and return the most significant | |
1317 | * filename suffix we can find. This ignores suffixes such as "~", | |
1318 | * ".bak", ".orig", ".~1~", etc. */ | |
1319 | const char *find_filename_suffix(const char *fn, int fn_len, int *len_ptr) | |
1320 | { | |
1321 | const char *suf, *s; | |
1322 | BOOL had_tilde; | |
1323 | int s_len; | |
1324 | ||
1325 | /* One or more dots at the start aren't a suffix. */ | |
1326 | while (fn_len && *fn == '.') fn++, fn_len--; | |
1327 | ||
1328 | /* Ignore the ~ in a "foo~" filename. */ | |
1329 | if (fn_len > 1 && fn[fn_len-1] == '~') | |
1330 | fn_len--, had_tilde = True; | |
1331 | else | |
1332 | had_tilde = False; | |
1333 | ||
1334 | /* Assume we don't find an suffix. */ | |
1335 | suf = ""; | |
1336 | *len_ptr = 0; | |
1337 | ||
1338 | /* Find the last significant suffix. */ | |
1339 | for (s = fn + fn_len; fn_len > 1; ) { | |
1340 | while (*--s != '.' && s != fn) {} | |
1341 | if (s == fn) | |
1342 | break; | |
1343 | s_len = fn_len - (s - fn); | |
1344 | fn_len = s - fn; | |
6012eaa1 | 1345 | if (s_len == 4) { |
e64ae6d7 WD |
1346 | if (strcmp(s+1, "bak") == 0 |
1347 | || strcmp(s+1, "old") == 0) | |
1348 | continue; | |
6012eaa1 | 1349 | } else if (s_len == 5) { |
e64ae6d7 WD |
1350 | if (strcmp(s+1, "orig") == 0) |
1351 | continue; | |
1352 | } else if (s_len > 2 && had_tilde | |
2dc7b8bd | 1353 | && s[1] == '~' && isDigit(s + 2)) |
e64ae6d7 WD |
1354 | continue; |
1355 | *len_ptr = s_len; | |
1356 | suf = s; | |
1357 | if (s_len == 1) | |
1358 | break; | |
1359 | /* Determine if the suffix is all digits. */ | |
1360 | for (s++, s_len--; s_len > 0; s++, s_len--) { | |
2dc7b8bd | 1361 | if (!isDigit(s)) |
e64ae6d7 WD |
1362 | return suf; |
1363 | } | |
1364 | /* An all-digit suffix may not be that signficant. */ | |
1365 | s = suf; | |
1366 | } | |
1367 | ||
1368 | return suf; | |
1369 | } | |
1370 | ||
1371 | /* This is an implementation of the Levenshtein distance algorithm. It | |
1372 | * was implemented to avoid needing a two-dimensional matrix (to save | |
1373 | * memory). It was also tweaked to try to factor in the ASCII distance | |
1374 | * between changed characters as a minor distance quantity. The normal | |
1375 | * Levenshtein units of distance (each signifying a single change between | |
1376 | * the two strings) are defined as a "UNIT". */ | |
1377 | ||
1378 | #define UNIT (1 << 16) | |
1379 | ||
1380 | uint32 fuzzy_distance(const char *s1, int len1, const char *s2, int len2) | |
1381 | { | |
1382 | uint32 a[MAXPATHLEN], diag, above, left, diag_inc, above_inc, left_inc; | |
1383 | int32 cost; | |
1384 | int i1, i2; | |
1385 | ||
1386 | if (!len1 || !len2) { | |
1387 | if (!len1) { | |
1388 | s1 = s2; | |
1389 | len1 = len2; | |
1390 | } | |
1391 | for (i1 = 0, cost = 0; i1 < len1; i1++) | |
1392 | cost += s1[i1]; | |
1393 | return (int32)len1 * UNIT + cost; | |
1394 | } | |
1395 | ||
1396 | for (i2 = 0; i2 < len2; i2++) | |
1397 | a[i2] = (i2+1) * UNIT; | |
1398 | ||
1399 | for (i1 = 0; i1 < len1; i1++) { | |
1400 | diag = i1 * UNIT; | |
1401 | above = (i1+1) * UNIT; | |
1402 | for (i2 = 0; i2 < len2; i2++) { | |
1403 | left = a[i2]; | |
1404 | if ((cost = *((uchar*)s1+i1) - *((uchar*)s2+i2)) != 0) { | |
1405 | if (cost < 0) | |
1406 | cost = UNIT - cost; | |
1407 | else | |
1408 | cost = UNIT + cost; | |
1409 | } | |
1410 | diag_inc = diag + cost; | |
1411 | left_inc = left + UNIT + *((uchar*)s1+i1); | |
1412 | above_inc = above + UNIT + *((uchar*)s2+i2); | |
1413 | a[i2] = above = left < above | |
1414 | ? (left_inc < diag_inc ? left_inc : diag_inc) | |
1415 | : (above_inc < diag_inc ? above_inc : diag_inc); | |
1416 | diag = left; | |
1417 | } | |
1418 | } | |
1419 | ||
1420 | return a[len2-1]; | |
1421 | } | |
c2b54076 WD |
1422 | |
1423 | #define BB_SLOT_SIZE (16*1024) /* Desired size in bytes */ | |
1424 | #define BB_PER_SLOT_BITS (BB_SLOT_SIZE * 8) /* Number of bits per slot */ | |
1425 | #define BB_PER_SLOT_INTS (BB_SLOT_SIZE / 4) /* Number of int32s per slot */ | |
1426 | ||
1427 | struct bitbag { | |
1428 | uint32 **bits; | |
1429 | int slot_cnt; | |
1430 | }; | |
1431 | ||
1432 | struct bitbag *bitbag_create(int max_ndx) | |
1433 | { | |
1434 | struct bitbag *bb = new(struct bitbag); | |
1435 | bb->slot_cnt = (max_ndx + BB_PER_SLOT_BITS - 1) / BB_PER_SLOT_BITS; | |
1436 | ||
1437 | if (!(bb->bits = (uint32**)calloc(bb->slot_cnt, sizeof (uint32*)))) | |
1438 | out_of_memory("bitbag_create"); | |
1439 | ||
1440 | return bb; | |
1441 | } | |
1442 | ||
1443 | void bitbag_set_bit(struct bitbag *bb, int ndx) | |
1444 | { | |
1445 | int slot = ndx / BB_PER_SLOT_BITS; | |
1446 | ndx %= BB_PER_SLOT_BITS; | |
1447 | ||
1448 | if (!bb->bits[slot]) { | |
1449 | if (!(bb->bits[slot] = (uint32*)calloc(BB_PER_SLOT_INTS, 4))) | |
1450 | out_of_memory("bitbag_set_bit"); | |
1451 | } | |
1452 | ||
1453 | bb->bits[slot][ndx/32] |= 1u << (ndx % 32); | |
1454 | } | |
1455 | ||
1456 | #if 0 /* not needed yet */ | |
1457 | void bitbag_clear_bit(struct bitbag *bb, int ndx) | |
1458 | { | |
1459 | int slot = ndx / BB_PER_SLOT_BITS; | |
1460 | ndx %= BB_PER_SLOT_BITS; | |
1461 | ||
1462 | if (!bb->bits[slot]) | |
1463 | return; | |
1464 | ||
1465 | bb->bits[slot][ndx/32] &= ~(1u << (ndx % 32)); | |
1466 | } | |
1467 | ||
1468 | int bitbag_check_bit(struct bitbag *bb, int ndx) | |
1469 | { | |
1470 | int slot = ndx / BB_PER_SLOT_BITS; | |
1471 | ndx %= BB_PER_SLOT_BITS; | |
1472 | ||
1473 | if (!bb->bits[slot]) | |
1474 | return 0; | |
1475 | ||
1476 | return bb->bits[slot][ndx/32] & (1u << (ndx % 32)) ? 1 : 0; | |
1477 | } | |
1478 | #endif | |
1479 | ||
1480 | /* Call this with -1 to start checking from 0. Returns -1 at the end. */ | |
1481 | int bitbag_next_bit(struct bitbag *bb, int after) | |
1482 | { | |
1483 | uint32 bits, mask; | |
1484 | int i, ndx = after + 1; | |
1485 | int slot = ndx / BB_PER_SLOT_BITS; | |
1486 | ndx %= BB_PER_SLOT_BITS; | |
1487 | ||
1488 | mask = (1u << (ndx % 32)) - 1; | |
1489 | for (i = ndx / 32; slot < bb->slot_cnt; slot++, i = mask = 0) { | |
1490 | if (!bb->bits[slot]) | |
1491 | continue; | |
1492 | for ( ; i < BB_PER_SLOT_INTS; i++, mask = 0) { | |
1493 | if (!(bits = bb->bits[slot][i] & ~mask)) | |
1494 | continue; | |
1495 | /* The xor magic figures out the lowest enabled bit in | |
1496 | * bits, and the switch quickly computes log2(bit). */ | |
1497 | switch (bits ^ (bits & (bits-1))) { | |
1498 | #define LOG2(n) case 1u << n: return slot*BB_PER_SLOT_BITS + i*32 + n | |
1499 | LOG2(0); LOG2(1); LOG2(2); LOG2(3); | |
1500 | LOG2(4); LOG2(5); LOG2(6); LOG2(7); | |
1501 | LOG2(8); LOG2(9); LOG2(10); LOG2(11); | |
1502 | LOG2(12); LOG2(13); LOG2(14); LOG2(15); | |
1503 | LOG2(16); LOG2(17); LOG2(18); LOG2(19); | |
1504 | LOG2(20); LOG2(21); LOG2(22); LOG2(23); | |
1505 | LOG2(24); LOG2(25); LOG2(26); LOG2(27); | |
1506 | LOG2(28); LOG2(29); LOG2(30); LOG2(31); | |
1507 | } | |
1508 | return -1; /* impossible... */ | |
1509 | } | |
1510 | } | |
1511 | ||
1512 | return -1; | |
1513 | } | |
1c3344a1 WD |
1514 | |
1515 | void *expand_item_list(item_list *lp, size_t item_size, | |
1516 | const char *desc, int incr) | |
1517 | { | |
1518 | /* First time through, 0 <= 0, so list is expanded. */ | |
1519 | if (lp->malloced <= lp->count) { | |
1520 | void *new_ptr; | |
1521 | size_t new_size = lp->malloced; | |
1522 | if (incr < 0) | |
0b515981 | 1523 | new_size += -incr; /* increase slowly */ |
1c3344a1 WD |
1524 | else if (new_size < (size_t)incr) |
1525 | new_size += incr; | |
1526 | else | |
1527 | new_size *= 2; | |
1fe2a353 WD |
1528 | if (new_size < lp->malloced) |
1529 | overflow_exit("expand_item_list"); | |
1530 | /* Using _realloc_array() lets us pass the size, not a type. */ | |
1531 | new_ptr = _realloc_array(lp->items, item_size, new_size); | |
951e826b | 1532 | if (DEBUG_GTE(FLIST, 3)) { |
6d56efa6 | 1533 | rprintf(FINFO, "[%s] expand %s to %s bytes, did%s move\n", |
adc2476f | 1534 | who_am_i(), desc, big_num(new_size * item_size), |
1c3344a1 WD |
1535 | new_ptr == lp->items ? " not" : ""); |
1536 | } | |
1537 | if (!new_ptr) | |
1538 | out_of_memory("expand_item_list"); | |
1539 | ||
1540 | lp->items = new_ptr; | |
1541 | lp->malloced = new_size; | |
1542 | } | |
1543 | return (char*)lp->items + (lp->count++ * item_size); | |
1544 | } |