| 1 | /* -*- c-file-style: "linux" -*- |
| 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 | */ |
| 21 | |
| 22 | /** |
| 23 | * @file |
| 24 | * |
| 25 | * Utilities used in rsync |
| 26 | **/ |
| 27 | |
| 28 | #include "rsync.h" |
| 29 | |
| 30 | extern int verbose; |
| 31 | extern int dry_run; |
| 32 | extern int module_id; |
| 33 | extern int modify_window; |
| 34 | extern struct exclude_list_struct server_exclude_list; |
| 35 | |
| 36 | int sanitize_paths = 0; |
| 37 | |
| 38 | |
| 39 | |
| 40 | /** |
| 41 | * Set a fd into nonblocking mode |
| 42 | **/ |
| 43 | void set_nonblocking(int fd) |
| 44 | { |
| 45 | int val; |
| 46 | |
| 47 | if ((val = fcntl(fd, F_GETFL, 0)) == -1) |
| 48 | return; |
| 49 | if (!(val & NONBLOCK_FLAG)) { |
| 50 | val |= NONBLOCK_FLAG; |
| 51 | fcntl(fd, F_SETFL, val); |
| 52 | } |
| 53 | } |
| 54 | |
| 55 | /** |
| 56 | * Set a fd into blocking mode |
| 57 | **/ |
| 58 | void set_blocking(int fd) |
| 59 | { |
| 60 | int val; |
| 61 | |
| 62 | if ((val = fcntl(fd, F_GETFL, 0)) == -1) |
| 63 | return; |
| 64 | if (val & NONBLOCK_FLAG) { |
| 65 | val &= ~NONBLOCK_FLAG; |
| 66 | fcntl(fd, F_SETFL, val); |
| 67 | } |
| 68 | } |
| 69 | |
| 70 | |
| 71 | /** |
| 72 | * Create a file descriptor pair - like pipe() but use socketpair if |
| 73 | * possible (because of blocking issues on pipes). |
| 74 | * |
| 75 | * Always set non-blocking. |
| 76 | */ |
| 77 | int fd_pair(int fd[2]) |
| 78 | { |
| 79 | int ret; |
| 80 | |
| 81 | #if HAVE_SOCKETPAIR |
| 82 | ret = socketpair(AF_UNIX, SOCK_STREAM, 0, fd); |
| 83 | #else |
| 84 | ret = pipe(fd); |
| 85 | #endif |
| 86 | |
| 87 | if (ret == 0) { |
| 88 | set_nonblocking(fd[0]); |
| 89 | set_nonblocking(fd[1]); |
| 90 | } |
| 91 | |
| 92 | return ret; |
| 93 | } |
| 94 | |
| 95 | |
| 96 | void print_child_argv(char **cmd) |
| 97 | { |
| 98 | rprintf(FINFO, "opening connection using "); |
| 99 | for (; *cmd; cmd++) { |
| 100 | /* Look for characters that ought to be quoted. This |
| 101 | * is not a great quoting algorithm, but it's |
| 102 | * sufficient for a log message. */ |
| 103 | if (strspn(*cmd, "abcdefghijklmnopqrstuvwxyz" |
| 104 | "ABCDEFGHIJKLMNOPQRSTUVWXYZ" |
| 105 | "0123456789" |
| 106 | ",.-_=+@/") != strlen(*cmd)) { |
| 107 | rprintf(FINFO, "\"%s\" ", *cmd); |
| 108 | } else { |
| 109 | rprintf(FINFO, "%s ", *cmd); |
| 110 | } |
| 111 | } |
| 112 | rprintf(FINFO, "\n"); |
| 113 | } |
| 114 | |
| 115 | |
| 116 | void out_of_memory(char *str) |
| 117 | { |
| 118 | rprintf(FERROR, "ERROR: out of memory in %s\n", str); |
| 119 | exit_cleanup(RERR_MALLOC); |
| 120 | } |
| 121 | |
| 122 | void overflow(char *str) |
| 123 | { |
| 124 | rprintf(FERROR, "ERROR: buffer overflow in %s\n", str); |
| 125 | exit_cleanup(RERR_MALLOC); |
| 126 | } |
| 127 | |
| 128 | |
| 129 | |
| 130 | int set_modtime(char *fname, time_t modtime) |
| 131 | { |
| 132 | if (dry_run) |
| 133 | return 0; |
| 134 | |
| 135 | if (verbose > 2) { |
| 136 | rprintf(FINFO, "set modtime of %s to (%ld) %s", |
| 137 | fname, (long)modtime, |
| 138 | asctime(localtime(&modtime))); |
| 139 | } |
| 140 | |
| 141 | { |
| 142 | #ifdef HAVE_UTIMBUF |
| 143 | struct utimbuf tbuf; |
| 144 | tbuf.actime = time(NULL); |
| 145 | tbuf.modtime = modtime; |
| 146 | return utime(fname,&tbuf); |
| 147 | #elif defined(HAVE_UTIME) |
| 148 | time_t t[2]; |
| 149 | t[0] = time(NULL); |
| 150 | t[1] = modtime; |
| 151 | return utime(fname,t); |
| 152 | #else |
| 153 | struct timeval t[2]; |
| 154 | t[0].tv_sec = time(NULL); |
| 155 | t[0].tv_usec = 0; |
| 156 | t[1].tv_sec = modtime; |
| 157 | t[1].tv_usec = 0; |
| 158 | return utimes(fname,t); |
| 159 | #endif |
| 160 | } |
| 161 | } |
| 162 | |
| 163 | |
| 164 | /** |
| 165 | Create any necessary directories in fname. Unfortunately we don't know |
| 166 | what perms to give the directory when this is called so we need to rely |
| 167 | on the umask |
| 168 | **/ |
| 169 | int create_directory_path(char *fname, int base_umask) |
| 170 | { |
| 171 | char *p; |
| 172 | |
| 173 | while (*fname == '/') |
| 174 | fname++; |
| 175 | while (strncmp(fname, "./", 2) == 0) |
| 176 | fname += 2; |
| 177 | |
| 178 | p = fname; |
| 179 | while ((p = strchr(p,'/')) != NULL) { |
| 180 | *p = 0; |
| 181 | do_mkdir(fname, 0777 & ~base_umask); |
| 182 | *p = '/'; |
| 183 | p++; |
| 184 | } |
| 185 | return 0; |
| 186 | } |
| 187 | |
| 188 | |
| 189 | /** |
| 190 | * Write @p len bytes at @p ptr to descriptor @p desc, retrying if |
| 191 | * interrupted. |
| 192 | * |
| 193 | * @retval len upon success |
| 194 | * |
| 195 | * @retval <0 write's (negative) error code |
| 196 | * |
| 197 | * Derived from GNU C's cccp.c. |
| 198 | */ |
| 199 | static int full_write(int desc, char *ptr, size_t len) |
| 200 | { |
| 201 | int total_written; |
| 202 | |
| 203 | total_written = 0; |
| 204 | while (len > 0) { |
| 205 | int written = write(desc, ptr, len); |
| 206 | if (written < 0) { |
| 207 | if (errno == EINTR) |
| 208 | continue; |
| 209 | return written; |
| 210 | } |
| 211 | total_written += written; |
| 212 | ptr += written; |
| 213 | len -= written; |
| 214 | } |
| 215 | return total_written; |
| 216 | } |
| 217 | |
| 218 | |
| 219 | /** |
| 220 | * Read @p len bytes at @p ptr from descriptor @p desc, retrying if |
| 221 | * interrupted. |
| 222 | * |
| 223 | * @retval >0 the actual number of bytes read |
| 224 | * |
| 225 | * @retval 0 for EOF |
| 226 | * |
| 227 | * @retval <0 for an error. |
| 228 | * |
| 229 | * Derived from GNU C's cccp.c. */ |
| 230 | static int safe_read(int desc, char *ptr, size_t len) |
| 231 | { |
| 232 | int n_chars; |
| 233 | |
| 234 | if (len == 0) |
| 235 | return len; |
| 236 | |
| 237 | do { |
| 238 | n_chars = read(desc, ptr, len); |
| 239 | } while (n_chars < 0 && errno == EINTR); |
| 240 | |
| 241 | return n_chars; |
| 242 | } |
| 243 | |
| 244 | |
| 245 | /** Copy a file. |
| 246 | * |
| 247 | * This is used in conjunction with the --temp-dir option */ |
| 248 | int copy_file(char *source, char *dest, mode_t mode) |
| 249 | { |
| 250 | int ifd; |
| 251 | int ofd; |
| 252 | char buf[1024 * 8]; |
| 253 | int len; /* Number of bytes read into `buf'. */ |
| 254 | |
| 255 | ifd = do_open(source, O_RDONLY, 0); |
| 256 | if (ifd == -1) { |
| 257 | rsyserr(FERROR, errno, "open %s", full_fname(source)); |
| 258 | return -1; |
| 259 | } |
| 260 | |
| 261 | if (robust_unlink(dest) && errno != ENOENT) { |
| 262 | rsyserr(FERROR, errno, "unlink %s", full_fname(dest)); |
| 263 | return -1; |
| 264 | } |
| 265 | |
| 266 | ofd = do_open(dest, O_WRONLY | O_CREAT | O_TRUNC | O_EXCL, mode); |
| 267 | if (ofd == -1) { |
| 268 | rsyserr(FERROR, errno, "open %s", full_fname(dest)); |
| 269 | close(ifd); |
| 270 | return -1; |
| 271 | } |
| 272 | |
| 273 | while ((len = safe_read(ifd, buf, sizeof buf)) > 0) { |
| 274 | if (full_write(ofd, buf, len) < 0) { |
| 275 | rsyserr(FERROR, errno, "write %s", full_fname(dest)); |
| 276 | close(ifd); |
| 277 | close(ofd); |
| 278 | return -1; |
| 279 | } |
| 280 | } |
| 281 | |
| 282 | if (len < 0) { |
| 283 | rsyserr(FERROR, errno, "read %s", full_fname(source)); |
| 284 | close(ifd); |
| 285 | close(ofd); |
| 286 | return -1; |
| 287 | } |
| 288 | |
| 289 | if (close(ifd) < 0) { |
| 290 | rsyserr(FINFO, errno, "close failed on %s", |
| 291 | full_fname(source)); |
| 292 | } |
| 293 | |
| 294 | if (close(ofd) < 0) { |
| 295 | rsyserr(FERROR, errno, "close failed on %s", |
| 296 | full_fname(dest)); |
| 297 | return -1; |
| 298 | } |
| 299 | |
| 300 | return 0; |
| 301 | } |
| 302 | |
| 303 | /* MAX_RENAMES should be 10**MAX_RENAMES_DIGITS */ |
| 304 | #define MAX_RENAMES_DIGITS 3 |
| 305 | #define MAX_RENAMES 1000 |
| 306 | |
| 307 | /** |
| 308 | * Robust unlink: some OS'es (HPUX) refuse to unlink busy files, so |
| 309 | * rename to <path>/.rsyncNNN instead. |
| 310 | * |
| 311 | * Note that successive rsync runs will shuffle the filenames around a |
| 312 | * bit as long as the file is still busy; this is because this function |
| 313 | * does not know if the unlink call is due to a new file coming in, or |
| 314 | * --delete trying to remove old .rsyncNNN files, hence it renames it |
| 315 | * each time. |
| 316 | **/ |
| 317 | int robust_unlink(char *fname) |
| 318 | { |
| 319 | #ifndef ETXTBSY |
| 320 | return do_unlink(fname); |
| 321 | #else |
| 322 | static int counter = 1; |
| 323 | int rc, pos, start; |
| 324 | char path[MAXPATHLEN]; |
| 325 | |
| 326 | rc = do_unlink(fname); |
| 327 | if (rc == 0 || errno != ETXTBSY) |
| 328 | return rc; |
| 329 | |
| 330 | if ((pos = strlcpy(path, fname, MAXPATHLEN)) >= MAXPATHLEN) |
| 331 | pos = MAXPATHLEN - 1; |
| 332 | |
| 333 | while (pos > 0 && path[pos-1] != '/') |
| 334 | pos--; |
| 335 | pos += strlcpy(path+pos, ".rsync", MAXPATHLEN-pos); |
| 336 | |
| 337 | if (pos > (MAXPATHLEN-MAX_RENAMES_DIGITS-1)) { |
| 338 | errno = ETXTBSY; |
| 339 | return -1; |
| 340 | } |
| 341 | |
| 342 | /* start where the last one left off to reduce chance of clashes */ |
| 343 | start = counter; |
| 344 | do { |
| 345 | sprintf(&path[pos], "%03d", counter); |
| 346 | if (++counter >= MAX_RENAMES) |
| 347 | counter = 1; |
| 348 | } while ((rc = access(path, 0)) == 0 && counter != start); |
| 349 | |
| 350 | if (verbose > 0) { |
| 351 | rprintf(FINFO,"renaming %s to %s because of text busy\n", |
| 352 | fname, path); |
| 353 | } |
| 354 | |
| 355 | /* maybe we should return rename()'s exit status? Nah. */ |
| 356 | if (do_rename(fname, path) != 0) { |
| 357 | errno = ETXTBSY; |
| 358 | return -1; |
| 359 | } |
| 360 | return 0; |
| 361 | #endif |
| 362 | } |
| 363 | |
| 364 | /* Returns 0 on success, -1 on most errors, and -2 if we got an error |
| 365 | * trying to copy the file across file systems. */ |
| 366 | int robust_rename(char *from, char *to, int mode) |
| 367 | { |
| 368 | int tries = 4; |
| 369 | |
| 370 | while (tries--) { |
| 371 | if (do_rename(from, to) == 0) |
| 372 | return 0; |
| 373 | |
| 374 | switch (errno) { |
| 375 | #ifdef ETXTBSY |
| 376 | case ETXTBSY: |
| 377 | if (robust_unlink(to) != 0) |
| 378 | return -1; |
| 379 | break; |
| 380 | #endif |
| 381 | case EXDEV: |
| 382 | if (copy_file(from, to, mode) != 0) |
| 383 | return -2; |
| 384 | do_unlink(from); |
| 385 | return 0; |
| 386 | default: |
| 387 | return -1; |
| 388 | } |
| 389 | } |
| 390 | return -1; |
| 391 | } |
| 392 | |
| 393 | |
| 394 | static pid_t all_pids[10]; |
| 395 | static int num_pids; |
| 396 | |
| 397 | /** Fork and record the pid of the child. **/ |
| 398 | pid_t do_fork(void) |
| 399 | { |
| 400 | pid_t newpid = fork(); |
| 401 | |
| 402 | if (newpid != 0 && newpid != -1) { |
| 403 | all_pids[num_pids++] = newpid; |
| 404 | } |
| 405 | return newpid; |
| 406 | } |
| 407 | |
| 408 | /** |
| 409 | * Kill all children. |
| 410 | * |
| 411 | * @todo It would be kind of nice to make sure that they are actually |
| 412 | * all our children before we kill them, because their pids may have |
| 413 | * been recycled by some other process. Perhaps when we wait for a |
| 414 | * child, we should remove it from this array. Alternatively we could |
| 415 | * perhaps use process groups, but I think that would not work on |
| 416 | * ancient Unix versions that don't support them. |
| 417 | **/ |
| 418 | void kill_all(int sig) |
| 419 | { |
| 420 | int i; |
| 421 | |
| 422 | for (i = 0; i < num_pids; i++) { |
| 423 | /* Let's just be a little careful where we |
| 424 | * point that gun, hey? See kill(2) for the |
| 425 | * magic caused by negative values. */ |
| 426 | pid_t p = all_pids[i]; |
| 427 | |
| 428 | if (p == getpid()) |
| 429 | continue; |
| 430 | if (p <= 0) |
| 431 | continue; |
| 432 | |
| 433 | kill(p, sig); |
| 434 | } |
| 435 | } |
| 436 | |
| 437 | |
| 438 | /** Turn a user name into a uid */ |
| 439 | int name_to_uid(char *name, uid_t *uid) |
| 440 | { |
| 441 | struct passwd *pass; |
| 442 | if (!name || !*name) |
| 443 | return 0; |
| 444 | pass = getpwnam(name); |
| 445 | if (pass) { |
| 446 | *uid = pass->pw_uid; |
| 447 | return 1; |
| 448 | } |
| 449 | return 0; |
| 450 | } |
| 451 | |
| 452 | /** Turn a group name into a gid */ |
| 453 | int name_to_gid(char *name, gid_t *gid) |
| 454 | { |
| 455 | struct group *grp; |
| 456 | if (!name || !*name) |
| 457 | return 0; |
| 458 | grp = getgrnam(name); |
| 459 | if (grp) { |
| 460 | *gid = grp->gr_gid; |
| 461 | return 1; |
| 462 | } |
| 463 | return 0; |
| 464 | } |
| 465 | |
| 466 | |
| 467 | /** Lock a byte range in a open file */ |
| 468 | int lock_range(int fd, int offset, int len) |
| 469 | { |
| 470 | struct flock lock; |
| 471 | |
| 472 | lock.l_type = F_WRLCK; |
| 473 | lock.l_whence = SEEK_SET; |
| 474 | lock.l_start = offset; |
| 475 | lock.l_len = len; |
| 476 | lock.l_pid = 0; |
| 477 | |
| 478 | return fcntl(fd,F_SETLK,&lock) == 0; |
| 479 | } |
| 480 | |
| 481 | static int exclude_server_path(char *arg) |
| 482 | { |
| 483 | char *s; |
| 484 | |
| 485 | if (server_exclude_list.head) { |
| 486 | for (s = arg; (s = strchr(s, '/')) != NULL; ) { |
| 487 | *s = '\0'; |
| 488 | if (check_exclude(&server_exclude_list, arg, 1) < 0) { |
| 489 | /* We must leave arg truncated! */ |
| 490 | return 1; |
| 491 | } |
| 492 | *s++ = '/'; |
| 493 | } |
| 494 | } |
| 495 | return 0; |
| 496 | } |
| 497 | |
| 498 | static void glob_expand_one(char *s, char **argv, int *argc_ptr, int maxargs) |
| 499 | { |
| 500 | int argc = *argc_ptr; |
| 501 | #if !(defined(HAVE_GLOB) && defined(HAVE_GLOB_H)) |
| 502 | if (maxargs <= argc) |
| 503 | return; |
| 504 | if (!*s) |
| 505 | s = "."; |
| 506 | s = argv[argc++] = strdup(s); |
| 507 | exclude_server_path(s); |
| 508 | #else |
| 509 | glob_t globbuf; |
| 510 | int i; |
| 511 | |
| 512 | if (maxargs <= argc) |
| 513 | return; |
| 514 | if (!*s) |
| 515 | s = "."; |
| 516 | |
| 517 | s = strdup(s); |
| 518 | if (sanitize_paths) |
| 519 | sanitize_path(s, NULL); |
| 520 | |
| 521 | memset(&globbuf, 0, sizeof globbuf); |
| 522 | if (!exclude_server_path(s)) |
| 523 | glob(s, 0, NULL, &globbuf); |
| 524 | if (globbuf.gl_pathc == 0) |
| 525 | argv[argc++] = s; |
| 526 | else { |
| 527 | int j = globbuf.gl_pathc; |
| 528 | if (j > maxargs - argc) |
| 529 | j = maxargs - argc; |
| 530 | free(s); |
| 531 | for (i = 0; i < j; i++) { |
| 532 | if (!(argv[argc++] = strdup(globbuf.gl_pathv[i]))) |
| 533 | out_of_memory("glob_expand_one"); |
| 534 | } |
| 535 | } |
| 536 | globfree(&globbuf); |
| 537 | #endif |
| 538 | *argc_ptr = argc; |
| 539 | } |
| 540 | |
| 541 | /* This routine is only used in daemon mode. */ |
| 542 | void glob_expand(char *base1, char **argv, int *argc_ptr, int maxargs) |
| 543 | { |
| 544 | char *s = argv[*argc_ptr]; |
| 545 | char *p, *q; |
| 546 | char *base = base1; |
| 547 | int base_len = strlen(base); |
| 548 | |
| 549 | if (!s || !*s) |
| 550 | return; |
| 551 | |
| 552 | if (strncmp(s, base, base_len) == 0) |
| 553 | s += base_len; |
| 554 | |
| 555 | if (!(s = strdup(s))) |
| 556 | out_of_memory("glob_expand"); |
| 557 | |
| 558 | if (asprintf(&base," %s/", base1) <= 0) |
| 559 | out_of_memory("glob_expand"); |
| 560 | base_len++; |
| 561 | |
| 562 | for (q = s; *q; q = p + base_len) { |
| 563 | if ((p = strstr(q, base)) != NULL) |
| 564 | *p = '\0'; /* split it at this point */ |
| 565 | glob_expand_one(q, argv, argc_ptr, maxargs); |
| 566 | if (!p) |
| 567 | break; |
| 568 | } |
| 569 | |
| 570 | free(s); |
| 571 | free(base); |
| 572 | } |
| 573 | |
| 574 | /** |
| 575 | * Convert a string to lower case |
| 576 | **/ |
| 577 | void strlower(char *s) |
| 578 | { |
| 579 | while (*s) { |
| 580 | if (isupper(*(unsigned char *)s)) |
| 581 | *s = tolower(*(unsigned char *)s); |
| 582 | s++; |
| 583 | } |
| 584 | } |
| 585 | |
| 586 | /* Join strings p1 & p2 into "dest" with a guaranteed '/' between them. (If |
| 587 | * p1 ends with a '/', no extra '/' is inserted.) Returns the length of both |
| 588 | * strings + 1 (if '/' was inserted), regardless of whether the null-terminated |
| 589 | * string fits into destsize. */ |
| 590 | size_t pathjoin(char *dest, size_t destsize, const char *p1, const char *p2) |
| 591 | { |
| 592 | size_t len = strlcpy(dest, p1, destsize); |
| 593 | if (len < destsize - 1) { |
| 594 | if (!len || dest[len-1] != '/') |
| 595 | dest[len++] = '/'; |
| 596 | if (len < destsize - 1) |
| 597 | len += strlcpy(dest + len, p2, destsize - len); |
| 598 | else { |
| 599 | dest[len] = '\0'; |
| 600 | len += strlen(p2); |
| 601 | } |
| 602 | } |
| 603 | else |
| 604 | len += strlen(p2) + 1; /* Assume we'd insert a '/'. */ |
| 605 | return len; |
| 606 | } |
| 607 | |
| 608 | /* Join any number of strings together, putting them in "dest". The return |
| 609 | * value is the length of all the strings, regardless of whether the null- |
| 610 | * terminated whole fits in destsize. Your list of string pointers must end |
| 611 | * with a NULL to indicate the end of the list. */ |
| 612 | size_t stringjoin(char *dest, size_t destsize, ...) |
| 613 | { |
| 614 | va_list ap; |
| 615 | size_t len, ret = 0; |
| 616 | const char *src; |
| 617 | |
| 618 | va_start(ap, destsize); |
| 619 | while (1) { |
| 620 | if (!(src = va_arg(ap, const char *))) |
| 621 | break; |
| 622 | len = strlen(src); |
| 623 | ret += len; |
| 624 | if (destsize > 1) { |
| 625 | if (len >= destsize) |
| 626 | len = destsize - 1; |
| 627 | memcpy(dest, src, len); |
| 628 | destsize -= len; |
| 629 | dest += len; |
| 630 | } |
| 631 | } |
| 632 | *dest = '\0'; |
| 633 | va_end(ap); |
| 634 | |
| 635 | return ret; |
| 636 | } |
| 637 | |
| 638 | void clean_fname(char *name) |
| 639 | { |
| 640 | char *p; |
| 641 | int l; |
| 642 | int modified = 1; |
| 643 | |
| 644 | if (!name) |
| 645 | return; |
| 646 | |
| 647 | while (modified) { |
| 648 | modified = 0; |
| 649 | |
| 650 | if ((p = strstr(name,"/./")) != NULL) { |
| 651 | modified = 1; |
| 652 | while (*p) { |
| 653 | p[0] = p[2]; |
| 654 | p++; |
| 655 | } |
| 656 | } |
| 657 | |
| 658 | if ((p = strstr(name,"//")) != NULL) { |
| 659 | modified = 1; |
| 660 | while (*p) { |
| 661 | p[0] = p[1]; |
| 662 | p++; |
| 663 | } |
| 664 | } |
| 665 | |
| 666 | if (strncmp(p = name, "./", 2) == 0) { |
| 667 | modified = 1; |
| 668 | do { |
| 669 | p[0] = p[2]; |
| 670 | } while (*p++); |
| 671 | } |
| 672 | |
| 673 | l = strlen(p = name); |
| 674 | if (l > 1 && p[l-1] == '/') { |
| 675 | modified = 1; |
| 676 | p[l-1] = 0; |
| 677 | } |
| 678 | } |
| 679 | } |
| 680 | |
| 681 | /** |
| 682 | * Make path appear as if a chroot had occurred: |
| 683 | * |
| 684 | * @li 1. remove leading "/" (or replace with "." if at end) |
| 685 | * |
| 686 | * @li 2. remove leading ".." components (except those allowed by @p reldir) |
| 687 | * |
| 688 | * @li 3. delete any other "<dir>/.." (recursively) |
| 689 | * |
| 690 | * Can only shrink paths, so sanitizes in place. |
| 691 | * |
| 692 | * While we're at it, remove double slashes and "." components like |
| 693 | * clean_fname() does, but DON'T remove a trailing slash because that |
| 694 | * is sometimes significant on command line arguments. |
| 695 | * |
| 696 | * If @p reldir is non-null, it is a sanitized directory that the path will be |
| 697 | * relative to, so allow as many ".." at the beginning of the path as |
| 698 | * there are components in reldir. This is used for symbolic link targets. |
| 699 | * If reldir is non-null and the path began with "/", to be completely like |
| 700 | * a chroot we should add in depth levels of ".." at the beginning of the |
| 701 | * path, but that would blow the assumption that the path doesn't grow and |
| 702 | * it is not likely to end up being a valid symlink anyway, so just do |
| 703 | * the normal removal of the leading "/" instead. |
| 704 | * |
| 705 | * Contributed by Dave Dykstra <dwd@bell-labs.com> |
| 706 | */ |
| 707 | void sanitize_path(char *p, char *reldir) |
| 708 | { |
| 709 | char *start, *sanp; |
| 710 | int depth = 0; |
| 711 | int allowdotdot = 0; |
| 712 | |
| 713 | if (reldir) { |
| 714 | int new_component = 1; |
| 715 | while (*reldir) { |
| 716 | if (*reldir++ == '/') |
| 717 | new_component = 1; |
| 718 | else if (new_component) { |
| 719 | new_component = 0; |
| 720 | depth++; |
| 721 | } |
| 722 | } |
| 723 | } |
| 724 | start = p; |
| 725 | sanp = p; |
| 726 | while (*p == '/') { |
| 727 | /* remove leading slashes */ |
| 728 | p++; |
| 729 | } |
| 730 | while (*p != '\0') { |
| 731 | /* this loop iterates once per filename component in p. |
| 732 | * both p (and sanp if the original had a slash) should |
| 733 | * always be left pointing after a slash |
| 734 | */ |
| 735 | if (*p == '.' && (p[1] == '/' || p[1] == '\0')) { |
| 736 | /* skip "." component */ |
| 737 | while (*++p == '/') { |
| 738 | /* skip following slashes */ |
| 739 | ; |
| 740 | } |
| 741 | continue; |
| 742 | } |
| 743 | allowdotdot = 0; |
| 744 | if (*p == '.' && p[1] == '.' && (p[2] == '/' || p[2] == '\0')) { |
| 745 | /* ".." component followed by slash or end */ |
| 746 | if (depth > 0 && sanp == start) { |
| 747 | /* allow depth levels of .. at the beginning */ |
| 748 | --depth; |
| 749 | allowdotdot = 1; |
| 750 | } else { |
| 751 | p += 2; |
| 752 | if (*p == '/') |
| 753 | p++; |
| 754 | if (sanp != start) { |
| 755 | /* back up sanp one level */ |
| 756 | --sanp; /* now pointing at slash */ |
| 757 | while (sanp > start && sanp[-1] != '/') { |
| 758 | /* skip back up to slash */ |
| 759 | sanp--; |
| 760 | } |
| 761 | } |
| 762 | continue; |
| 763 | } |
| 764 | } |
| 765 | while (1) { |
| 766 | /* copy one component through next slash */ |
| 767 | *sanp++ = *p++; |
| 768 | if (*p == '\0' || p[-1] == '/') { |
| 769 | while (*p == '/') { |
| 770 | /* skip multiple slashes */ |
| 771 | p++; |
| 772 | } |
| 773 | break; |
| 774 | } |
| 775 | } |
| 776 | if (allowdotdot) { |
| 777 | /* move the virtual beginning to leave the .. alone */ |
| 778 | start = sanp; |
| 779 | } |
| 780 | } |
| 781 | if (sanp == start && !allowdotdot) { |
| 782 | /* ended up with nothing, so put in "." component */ |
| 783 | /* |
| 784 | * note that the !allowdotdot doesn't prevent this from |
| 785 | * happening in all allowed ".." situations, but I didn't |
| 786 | * think it was worth putting in an extra variable to ensure |
| 787 | * it since an extra "." won't hurt in those situations. |
| 788 | */ |
| 789 | *sanp++ = '.'; |
| 790 | } |
| 791 | *sanp = '\0'; |
| 792 | } |
| 793 | |
| 794 | /* Works much like sanitize_path(), with these differences: (1) a new buffer |
| 795 | * is allocated for the sanitized path rather than modifying it in-place; (2) |
| 796 | * a leading slash gets transformed into the rootdir value (which can be empty |
| 797 | * or NULL if you just want the slash to get dropped); (3) no "reldir" can be |
| 798 | * specified. */ |
| 799 | char *alloc_sanitize_path(const char *path, const char *rootdir) |
| 800 | { |
| 801 | char *buf; |
| 802 | int rlen, plen = strlen(path); |
| 803 | |
| 804 | if (*path == '/' && rootdir) { |
| 805 | rlen = strlen(rootdir); |
| 806 | if (rlen == 1) |
| 807 | path++; |
| 808 | } else |
| 809 | rlen = 0; |
| 810 | if (!(buf = new_array(char, rlen + plen + 1))) |
| 811 | out_of_memory("alloc_sanitize_path"); |
| 812 | if (rlen) |
| 813 | memcpy(buf, rootdir, rlen); |
| 814 | memcpy(buf + rlen, path, plen + 1); |
| 815 | |
| 816 | if (rlen > 1) |
| 817 | rlen++; |
| 818 | sanitize_path(buf + rlen, NULL); |
| 819 | if (rlen && buf[rlen] == '.' && buf[rlen+1] == '\0') { |
| 820 | if (rlen > 1) |
| 821 | rlen--; |
| 822 | buf[rlen] = '\0'; |
| 823 | } |
| 824 | |
| 825 | return buf; |
| 826 | } |
| 827 | |
| 828 | char curr_dir[MAXPATHLEN]; |
| 829 | unsigned int curr_dir_len; |
| 830 | |
| 831 | /** |
| 832 | * Like chdir(), but it keeps track of the current directory (in the |
| 833 | * global "curr_dir"), and ensures that the path size doesn't overflow. |
| 834 | * Also cleans the path using the clean_fname() function. |
| 835 | **/ |
| 836 | int push_dir(char *dir) |
| 837 | { |
| 838 | static int initialised; |
| 839 | unsigned int len; |
| 840 | |
| 841 | if (!initialised) { |
| 842 | initialised = 1; |
| 843 | getcwd(curr_dir, sizeof curr_dir - 1); |
| 844 | curr_dir_len = strlen(curr_dir); |
| 845 | } |
| 846 | |
| 847 | if (!dir) /* this call was probably just to initialize */ |
| 848 | return 0; |
| 849 | |
| 850 | len = strlen(dir); |
| 851 | if (len == 1 && *dir == '.') |
| 852 | return 1; |
| 853 | |
| 854 | if ((*dir == '/' ? len : curr_dir_len + 1 + len) >= sizeof curr_dir) |
| 855 | return 0; |
| 856 | |
| 857 | if (chdir(dir)) |
| 858 | return 0; |
| 859 | |
| 860 | if (*dir == '/') { |
| 861 | memcpy(curr_dir, dir, len + 1); |
| 862 | curr_dir_len = len; |
| 863 | } else { |
| 864 | curr_dir[curr_dir_len++] = '/'; |
| 865 | memcpy(curr_dir + curr_dir_len, dir, len + 1); |
| 866 | curr_dir_len += len; |
| 867 | } |
| 868 | |
| 869 | clean_fname(curr_dir); |
| 870 | |
| 871 | return 1; |
| 872 | } |
| 873 | |
| 874 | /** |
| 875 | * Reverse a push_dir() call. You must pass in an absolute path |
| 876 | * that was copied from a prior value of "curr_dir". |
| 877 | **/ |
| 878 | int pop_dir(char *dir) |
| 879 | { |
| 880 | if (chdir(dir)) |
| 881 | return 0; |
| 882 | |
| 883 | curr_dir_len = strlcpy(curr_dir, dir, sizeof curr_dir); |
| 884 | if (curr_dir_len >= sizeof curr_dir) |
| 885 | curr_dir_len = sizeof curr_dir - 1; |
| 886 | |
| 887 | return 1; |
| 888 | } |
| 889 | |
| 890 | /** |
| 891 | * Return a quoted string with the full pathname of the indicated filename. |
| 892 | * The string " (in MODNAME)" may also be appended. The returned pointer |
| 893 | * remains valid until the next time full_fname() is called. |
| 894 | **/ |
| 895 | char *full_fname(const char *fn) |
| 896 | { |
| 897 | static char *result = NULL; |
| 898 | char *m1, *m2, *m3; |
| 899 | char *p1, *p2; |
| 900 | |
| 901 | if (result) |
| 902 | free(result); |
| 903 | |
| 904 | if (*fn == '/') |
| 905 | p1 = p2 = ""; |
| 906 | else { |
| 907 | p1 = curr_dir; |
| 908 | p2 = "/"; |
| 909 | } |
| 910 | if (module_id >= 0) { |
| 911 | m1 = " (in "; |
| 912 | m2 = lp_name(module_id); |
| 913 | m3 = ")"; |
| 914 | if (*p1) { |
| 915 | if (!lp_use_chroot(module_id)) { |
| 916 | char *p = lp_path(module_id); |
| 917 | if (*p != '/' || p[1]) |
| 918 | p1 += strlen(p); |
| 919 | } |
| 920 | if (!*p1) |
| 921 | p2++; |
| 922 | else |
| 923 | p1++; |
| 924 | } |
| 925 | else |
| 926 | fn++; |
| 927 | } else |
| 928 | m1 = m2 = m3 = ""; |
| 929 | |
| 930 | asprintf(&result, "\"%s%s%s\"%s%s%s", p1, p2, fn, m1, m2, m3); |
| 931 | |
| 932 | return result; |
| 933 | } |
| 934 | |
| 935 | /** We need to supply our own strcmp function for file list comparisons |
| 936 | to ensure that signed/unsigned usage is consistent between machines. */ |
| 937 | int u_strcmp(const char *cs1, const char *cs2) |
| 938 | { |
| 939 | const uchar *s1 = (const uchar *)cs1; |
| 940 | const uchar *s2 = (const uchar *)cs2; |
| 941 | |
| 942 | while (*s1 && *s2 && (*s1 == *s2)) { |
| 943 | s1++; s2++; |
| 944 | } |
| 945 | |
| 946 | return (int)*s1 - (int)*s2; |
| 947 | } |
| 948 | |
| 949 | |
| 950 | |
| 951 | /** |
| 952 | * Determine if a symlink points outside the current directory tree. |
| 953 | * This is considered "unsafe" because e.g. when mirroring somebody |
| 954 | * else's machine it might allow them to establish a symlink to |
| 955 | * /etc/passwd, and then read it through a web server. |
| 956 | * |
| 957 | * Null symlinks and absolute symlinks are always unsafe. |
| 958 | * |
| 959 | * Basically here we are concerned with symlinks whose target contains |
| 960 | * "..", because this might cause us to walk back up out of the |
| 961 | * transferred directory. We are not allowed to go back up and |
| 962 | * reenter. |
| 963 | * |
| 964 | * @param dest Target of the symlink in question. |
| 965 | * |
| 966 | * @param src Top source directory currently applicable. Basically this |
| 967 | * is the first parameter to rsync in a simple invocation, but it's |
| 968 | * modified by flist.c in slightly complex ways. |
| 969 | * |
| 970 | * @retval True if unsafe |
| 971 | * @retval False is unsafe |
| 972 | * |
| 973 | * @sa t_unsafe.c |
| 974 | **/ |
| 975 | int unsafe_symlink(const char *dest, const char *src) |
| 976 | { |
| 977 | const char *name, *slash; |
| 978 | int depth = 0; |
| 979 | |
| 980 | /* all absolute and null symlinks are unsafe */ |
| 981 | if (!dest || !*dest || *dest == '/') |
| 982 | return 1; |
| 983 | |
| 984 | /* find out what our safety margin is */ |
| 985 | for (name = src; (slash = strchr(name, '/')) != 0; name = slash+1) { |
| 986 | if (strncmp(name, "../", 3) == 0) { |
| 987 | depth = 0; |
| 988 | } else if (strncmp(name, "./", 2) == 0) { |
| 989 | /* nothing */ |
| 990 | } else { |
| 991 | depth++; |
| 992 | } |
| 993 | } |
| 994 | if (strcmp(name, "..") == 0) |
| 995 | depth = 0; |
| 996 | |
| 997 | for (name = dest; (slash = strchr(name, '/')) != 0; name = slash+1) { |
| 998 | if (strncmp(name, "../", 3) == 0) { |
| 999 | /* if at any point we go outside the current directory |
| 1000 | then stop - it is unsafe */ |
| 1001 | if (--depth < 0) |
| 1002 | return 1; |
| 1003 | } else if (strncmp(name, "./", 2) == 0) { |
| 1004 | /* nothing */ |
| 1005 | } else { |
| 1006 | depth++; |
| 1007 | } |
| 1008 | } |
| 1009 | if (strcmp(name, "..") == 0) |
| 1010 | depth--; |
| 1011 | |
| 1012 | return (depth < 0); |
| 1013 | } |
| 1014 | |
| 1015 | |
| 1016 | /** |
| 1017 | * Return the date and time as a string |
| 1018 | **/ |
| 1019 | char *timestring(time_t t) |
| 1020 | { |
| 1021 | static char TimeBuf[200]; |
| 1022 | struct tm *tm = localtime(&t); |
| 1023 | |
| 1024 | #ifdef HAVE_STRFTIME |
| 1025 | strftime(TimeBuf, sizeof TimeBuf - 1, "%Y/%m/%d %H:%M:%S", tm); |
| 1026 | #else |
| 1027 | strlcpy(TimeBuf, asctime(tm), sizeof TimeBuf); |
| 1028 | #endif |
| 1029 | |
| 1030 | if (TimeBuf[strlen(TimeBuf)-1] == '\n') { |
| 1031 | TimeBuf[strlen(TimeBuf)-1] = 0; |
| 1032 | } |
| 1033 | |
| 1034 | return(TimeBuf); |
| 1035 | } |
| 1036 | |
| 1037 | |
| 1038 | /** |
| 1039 | * Sleep for a specified number of milliseconds. |
| 1040 | * |
| 1041 | * Always returns TRUE. (In the future it might return FALSE if |
| 1042 | * interrupted.) |
| 1043 | **/ |
| 1044 | int msleep(int t) |
| 1045 | { |
| 1046 | int tdiff = 0; |
| 1047 | struct timeval tval, t1, t2; |
| 1048 | |
| 1049 | gettimeofday(&t1, NULL); |
| 1050 | |
| 1051 | while (tdiff < t) { |
| 1052 | tval.tv_sec = (t-tdiff)/1000; |
| 1053 | tval.tv_usec = 1000*((t-tdiff)%1000); |
| 1054 | |
| 1055 | errno = 0; |
| 1056 | select(0,NULL,NULL, NULL, &tval); |
| 1057 | |
| 1058 | gettimeofday(&t2, NULL); |
| 1059 | tdiff = (t2.tv_sec - t1.tv_sec)*1000 + |
| 1060 | (t2.tv_usec - t1.tv_usec)/1000; |
| 1061 | } |
| 1062 | |
| 1063 | return True; |
| 1064 | } |
| 1065 | |
| 1066 | |
| 1067 | /** |
| 1068 | * Determine if two file modification times are equivalent (either |
| 1069 | * exact or in the modification timestamp window established by |
| 1070 | * --modify-window). |
| 1071 | * |
| 1072 | * @retval 0 if the times should be treated as the same |
| 1073 | * |
| 1074 | * @retval +1 if the first is later |
| 1075 | * |
| 1076 | * @retval -1 if the 2nd is later |
| 1077 | **/ |
| 1078 | int cmp_modtime(time_t file1, time_t file2) |
| 1079 | { |
| 1080 | if (file2 > file1) { |
| 1081 | if (file2 - file1 <= modify_window) |
| 1082 | return 0; |
| 1083 | return -1; |
| 1084 | } |
| 1085 | if (file1 - file2 <= modify_window) |
| 1086 | return 0; |
| 1087 | return 1; |
| 1088 | } |
| 1089 | |
| 1090 | |
| 1091 | #ifdef __INSURE__XX |
| 1092 | #include <dlfcn.h> |
| 1093 | |
| 1094 | /** |
| 1095 | This routine is a trick to immediately catch errors when debugging |
| 1096 | with insure. A xterm with a gdb is popped up when insure catches |
| 1097 | a error. It is Linux specific. |
| 1098 | **/ |
| 1099 | int _Insure_trap_error(int a1, int a2, int a3, int a4, int a5, int a6) |
| 1100 | { |
| 1101 | static int (*fn)(); |
| 1102 | int ret; |
| 1103 | char *cmd; |
| 1104 | |
| 1105 | 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'", |
| 1106 | getpid(), getpid(), getpid()); |
| 1107 | |
| 1108 | if (!fn) { |
| 1109 | static void *h; |
| 1110 | h = dlopen("/usr/local/parasoft/insure++lite/lib.linux2/libinsure.so", RTLD_LAZY); |
| 1111 | fn = dlsym(h, "_Insure_trap_error"); |
| 1112 | } |
| 1113 | |
| 1114 | ret = fn(a1, a2, a3, a4, a5, a6); |
| 1115 | |
| 1116 | system(cmd); |
| 1117 | |
| 1118 | free(cmd); |
| 1119 | |
| 1120 | return ret; |
| 1121 | } |
| 1122 | #endif |
| 1123 | |
| 1124 | |
| 1125 | #define MALLOC_MAX 0x40000000 |
| 1126 | |
| 1127 | void *_new_array(unsigned int size, unsigned long num) |
| 1128 | { |
| 1129 | if (num >= MALLOC_MAX/size) |
| 1130 | return NULL; |
| 1131 | return malloc(size * num); |
| 1132 | } |
| 1133 | |
| 1134 | void *_realloc_array(void *ptr, unsigned int size, unsigned long num) |
| 1135 | { |
| 1136 | if (num >= MALLOC_MAX/size) |
| 1137 | return NULL; |
| 1138 | /* No realloc should need this, but just in case... */ |
| 1139 | if (!ptr) |
| 1140 | return malloc(size * num); |
| 1141 | return realloc(ptr, size * num); |
| 1142 | } |