1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1988, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * David Hitz of Auspex Systems Inc. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #if 0 36 #ifndef lint 37 static char const copyright[] = 38 "@(#) Copyright (c) 1988, 1993, 1994\n\ 39 The Regents of the University of California. All rights reserved.\n"; 40 #endif /* not lint */ 41 42 #ifndef lint 43 static char sccsid[] = "@(#)cp.c 8.2 (Berkeley) 4/1/94"; 44 #endif /* not lint */ 45 #endif 46 #include <sys/cdefs.h> 47 __FBSDID("$FreeBSD$"); 48 49 /* 50 * Cp copies source files to target files. 51 * 52 * The global PATH_T structure "to" always contains the path to the 53 * current target file. Since fts(3) does not change directories, 54 * this path can be either absolute or dot-relative. 55 * 56 * The basic algorithm is to initialize "to" and use fts(3) to traverse 57 * the file hierarchy rooted in the argument list. A trivial case is the 58 * case of 'cp file1 file2'. The more interesting case is the case of 59 * 'cp file1 file2 ... fileN dir' where the hierarchy is traversed and the 60 * path (relative to the root of the traversal) is appended to dir (stored 61 * in "to") to form the final target path. 62 */ 63 64 #include <sys/types.h> 65 #include <sys/stat.h> 66 67 #include <assert.h> 68 #include <err.h> 69 #include <errno.h> 70 #include <fts.h> 71 #include <limits.h> 72 #include <signal.h> 73 #include <stdio.h> 74 #include <stdlib.h> 75 #include <string.h> 76 #include <unistd.h> 77 78 #include "extern.h" 79 80 #define STRIP_TRAILING_SLASH(p) { \ 81 while ((p).p_end > (p).p_path + 1 && (p).p_end[-1] == '/') \ 82 *--(p).p_end = 0; \ 83 } 84 85 static char emptystring[] = ""; 86 87 PATH_T to = { to.p_path, emptystring, "" }; 88 89 int fflag, iflag, lflag, nflag, pflag, sflag, vflag; 90 static int Hflag, Lflag, Rflag, rflag; 91 volatile sig_atomic_t info; 92 93 enum op { FILE_TO_FILE, FILE_TO_DIR, DIR_TO_DNE }; 94 95 static int copy(char *[], enum op, int, struct stat *); 96 static void siginfo(int __unused); 97 98 int 99 main(int argc, char *argv[]) 100 { 101 struct stat to_stat, tmp_stat; 102 enum op type; 103 int ch, fts_options, r, have_trailing_slash; 104 char *target; 105 106 fts_options = FTS_NOCHDIR | FTS_PHYSICAL; 107 while ((ch = getopt(argc, argv, "HLPRafilnprsvx")) != -1) 108 switch (ch) { 109 case 'H': 110 Hflag = 1; 111 Lflag = 0; 112 break; 113 case 'L': 114 Lflag = 1; 115 Hflag = 0; 116 break; 117 case 'P': 118 Hflag = Lflag = 0; 119 break; 120 case 'R': 121 Rflag = 1; 122 break; 123 case 'a': 124 pflag = 1; 125 Rflag = 1; 126 Hflag = Lflag = 0; 127 break; 128 case 'f': 129 fflag = 1; 130 iflag = nflag = 0; 131 break; 132 case 'i': 133 iflag = 1; 134 fflag = nflag = 0; 135 break; 136 case 'l': 137 lflag = 1; 138 break; 139 case 'n': 140 nflag = 1; 141 fflag = iflag = 0; 142 break; 143 case 'p': 144 pflag = 1; 145 break; 146 case 'r': 147 rflag = Lflag = 1; 148 Hflag = 0; 149 break; 150 case 's': 151 sflag = 1; 152 break; 153 case 'v': 154 vflag = 1; 155 break; 156 case 'x': 157 fts_options |= FTS_XDEV; 158 break; 159 default: 160 usage(); 161 break; 162 } 163 argc -= optind; 164 argv += optind; 165 166 if (argc < 2) 167 usage(); 168 169 if (Rflag && rflag) 170 errx(1, "the -R and -r options may not be specified together"); 171 if (lflag && sflag) 172 errx(1, "the -l and -s options may not be specified together"); 173 if (rflag) 174 Rflag = 1; 175 if (Rflag) { 176 if (Hflag) 177 fts_options |= FTS_COMFOLLOW; 178 if (Lflag) { 179 fts_options &= ~FTS_PHYSICAL; 180 fts_options |= FTS_LOGICAL; 181 } 182 } else { 183 fts_options &= ~FTS_PHYSICAL; 184 fts_options |= FTS_LOGICAL | FTS_COMFOLLOW; 185 } 186 (void)signal(SIGINFO, siginfo); 187 188 /* Save the target base in "to". */ 189 target = argv[--argc]; 190 if (strlcpy(to.p_path, target, sizeof(to.p_path)) >= sizeof(to.p_path)) 191 errx(1, "%s: name too long", target); 192 to.p_end = to.p_path + strlen(to.p_path); 193 if (to.p_path == to.p_end) { 194 *to.p_end++ = '.'; 195 *to.p_end = 0; 196 } 197 have_trailing_slash = (to.p_end[-1] == '/'); 198 if (have_trailing_slash) 199 STRIP_TRAILING_SLASH(to); 200 to.target_end = to.p_end; 201 202 /* Set end of argument list for fts(3). */ 203 argv[argc] = NULL; 204 205 /* 206 * Cp has two distinct cases: 207 * 208 * cp [-R] source target 209 * cp [-R] source1 ... sourceN directory 210 * 211 * In both cases, source can be either a file or a directory. 212 * 213 * In (1), the target becomes a copy of the source. That is, if the 214 * source is a file, the target will be a file, and likewise for 215 * directories. 216 * 217 * In (2), the real target is not directory, but "directory/source". 218 */ 219 r = stat(to.p_path, &to_stat); 220 if (r == -1 && errno != ENOENT) 221 err(1, "%s", to.p_path); 222 if (r == -1 || !S_ISDIR(to_stat.st_mode)) { 223 /* 224 * Case (1). Target is not a directory. 225 */ 226 if (argc > 1) 227 errx(1, "%s is not a directory", to.p_path); 228 229 /* 230 * Need to detect the case: 231 * cp -R dir foo 232 * Where dir is a directory and foo does not exist, where 233 * we want pathname concatenations turned on but not for 234 * the initial mkdir(). 235 */ 236 if (r == -1) { 237 if (Rflag && (Lflag || Hflag)) 238 stat(*argv, &tmp_stat); 239 else 240 lstat(*argv, &tmp_stat); 241 242 if (S_ISDIR(tmp_stat.st_mode) && Rflag) 243 type = DIR_TO_DNE; 244 else 245 type = FILE_TO_FILE; 246 } else 247 type = FILE_TO_FILE; 248 249 if (have_trailing_slash && type == FILE_TO_FILE) { 250 if (r == -1) { 251 errx(1, "directory %s does not exist", 252 to.p_path); 253 } else 254 errx(1, "%s is not a directory", to.p_path); 255 } 256 } else 257 /* 258 * Case (2). Target is a directory. 259 */ 260 type = FILE_TO_DIR; 261 262 /* 263 * For DIR_TO_DNE, we could provide copy() with the to_stat we've 264 * already allocated on the stack here that isn't being used for 265 * anything. Not doing so, though, simplifies later logic a little bit 266 * as we need to skip checking root_stat on the first iteration and 267 * ensure that we set it with the first mkdir(). 268 */ 269 exit (copy(argv, type, fts_options, (type == DIR_TO_DNE ? NULL : 270 &to_stat))); 271 } 272 273 /* Does the right thing based on -R + -H/-L/-P */ 274 static int 275 copy_stat(const char *path, struct stat *sb) 276 { 277 278 /* 279 * For -R -H/-P, we need to lstat() instead; copy() cares about the link 280 * itself rather than the target if we're not following links during the 281 * traversal. 282 */ 283 if (!Rflag || Lflag) 284 return (stat(path, sb)); 285 return (lstat(path, sb)); 286 } 287 288 289 static int 290 copy(char *argv[], enum op type, int fts_options, struct stat *root_stat) 291 { 292 struct stat created_root_stat, to_stat; 293 FTS *ftsp; 294 FTSENT *curr; 295 int base = 0, dne, badcp, rval; 296 size_t nlen; 297 char *p, *recurse_path, *target_mid; 298 mode_t mask, mode; 299 300 /* 301 * Keep an inverted copy of the umask, for use in correcting 302 * permissions on created directories when not using -p. 303 */ 304 mask = ~umask(0777); 305 umask(~mask); 306 307 recurse_path = NULL; 308 if ((ftsp = fts_open(argv, fts_options, NULL)) == NULL) 309 err(1, "fts_open"); 310 for (badcp = rval = 0; errno = 0, (curr = fts_read(ftsp)) != NULL; 311 badcp = 0) { 312 switch (curr->fts_info) { 313 case FTS_NS: 314 case FTS_DNR: 315 case FTS_ERR: 316 warnx("%s: %s", 317 curr->fts_path, strerror(curr->fts_errno)); 318 badcp = rval = 1; 319 continue; 320 case FTS_DC: /* Warn, continue. */ 321 warnx("%s: directory causes a cycle", curr->fts_path); 322 badcp = rval = 1; 323 continue; 324 default: 325 ; 326 } 327 328 if (curr->fts_info == FTS_D && type != FILE_TO_FILE && 329 root_stat != NULL && 330 root_stat->st_dev == curr->fts_statp->st_dev && 331 root_stat->st_ino == curr->fts_statp->st_ino) { 332 assert(recurse_path == NULL); 333 if (curr->fts_level > FTS_ROOTLEVEL) { 334 /* 335 * If the recursion isn't at the immediate 336 * level, we can just not traverse into this 337 * directory. 338 */ 339 fts_set(ftsp, curr, FTS_SKIP); 340 continue; 341 } else { 342 const char *slash; 343 344 /* 345 * Grab the last path component and double it, 346 * to make life easier later and ensure that 347 * we work even with fts_level == 0 is a couple 348 * of components deep in fts_path. No path 349 * separators are fine and expected in the 350 * common case, though. 351 */ 352 slash = strrchr(curr->fts_path, '/'); 353 if (slash != NULL) 354 slash++; 355 else 356 slash = curr->fts_path; 357 if (asprintf(&recurse_path, "%s/%s", 358 curr->fts_path, slash) == -1) 359 err(1, "asprintf"); 360 } 361 } 362 363 if (recurse_path != NULL && 364 strcmp(curr->fts_path, recurse_path) == 0) { 365 fts_set(ftsp, curr, FTS_SKIP); 366 continue; 367 } 368 369 /* 370 * If we are in case (2) or (3) above, we need to append the 371 * source name to the target name. 372 */ 373 if (type != FILE_TO_FILE) { 374 /* 375 * Need to remember the roots of traversals to create 376 * correct pathnames. If there's a directory being 377 * copied to a non-existent directory, e.g. 378 * cp -R a/dir noexist 379 * the resulting path name should be noexist/foo, not 380 * noexist/dir/foo (where foo is a file in dir), which 381 * is the case where the target exists. 382 * 383 * Also, check for "..". This is for correct path 384 * concatenation for paths ending in "..", e.g. 385 * cp -R .. /tmp 386 * Paths ending in ".." are changed to ".". This is 387 * tricky, but seems the easiest way to fix the problem. 388 * 389 * XXX 390 * Since the first level MUST be FTS_ROOTLEVEL, base 391 * is always initialized. 392 */ 393 if (curr->fts_level == FTS_ROOTLEVEL) { 394 if (type != DIR_TO_DNE) { 395 p = strrchr(curr->fts_path, '/'); 396 base = (p == NULL) ? 0 : 397 (int)(p - curr->fts_path + 1); 398 399 if (!strcmp(&curr->fts_path[base], 400 "..")) 401 base += 1; 402 } else 403 base = curr->fts_pathlen; 404 } 405 406 p = &curr->fts_path[base]; 407 nlen = curr->fts_pathlen - base; 408 target_mid = to.target_end; 409 if (*p != '/' && target_mid[-1] != '/') 410 *target_mid++ = '/'; 411 *target_mid = 0; 412 if (target_mid - to.p_path + nlen >= PATH_MAX) { 413 warnx("%s%s: name too long (not copied)", 414 to.p_path, p); 415 badcp = rval = 1; 416 continue; 417 } 418 (void)strncat(target_mid, p, nlen); 419 to.p_end = target_mid + nlen; 420 *to.p_end = 0; 421 STRIP_TRAILING_SLASH(to); 422 } 423 424 if (curr->fts_info == FTS_DP) { 425 /* 426 * We are nearly finished with this directory. If we 427 * didn't actually copy it, or otherwise don't need to 428 * change its attributes, then we are done. 429 */ 430 if (!curr->fts_number) 431 continue; 432 /* 433 * If -p is in effect, set all the attributes. 434 * Otherwise, set the correct permissions, limited 435 * by the umask. Optimise by avoiding a chmod() 436 * if possible (which is usually the case if we 437 * made the directory). Note that mkdir() does not 438 * honour setuid, setgid and sticky bits, but we 439 * normally want to preserve them on directories. 440 */ 441 if (pflag) { 442 if (setfile(curr->fts_statp, -1)) 443 rval = 1; 444 if (preserve_dir_acls(curr->fts_statp, 445 curr->fts_accpath, to.p_path) != 0) 446 rval = 1; 447 } else { 448 mode = curr->fts_statp->st_mode; 449 if ((mode & (S_ISUID | S_ISGID | S_ISTXT)) || 450 ((mode | S_IRWXU) & mask) != (mode & mask)) 451 if (chmod(to.p_path, mode & mask) != 452 0) { 453 warn("chmod: %s", to.p_path); 454 rval = 1; 455 } 456 } 457 continue; 458 } 459 460 /* Not an error but need to remember it happened. */ 461 if (copy_stat(to.p_path, &to_stat) == -1) 462 dne = 1; 463 else { 464 if (to_stat.st_dev == curr->fts_statp->st_dev && 465 to_stat.st_ino == curr->fts_statp->st_ino) { 466 warnx("%s and %s are identical (not copied).", 467 to.p_path, curr->fts_path); 468 badcp = rval = 1; 469 if (S_ISDIR(curr->fts_statp->st_mode)) 470 (void)fts_set(ftsp, curr, FTS_SKIP); 471 continue; 472 } 473 if (!S_ISDIR(curr->fts_statp->st_mode) && 474 S_ISDIR(to_stat.st_mode)) { 475 warnx("cannot overwrite directory %s with " 476 "non-directory %s", 477 to.p_path, curr->fts_path); 478 badcp = rval = 1; 479 continue; 480 } 481 dne = 0; 482 } 483 484 switch (curr->fts_statp->st_mode & S_IFMT) { 485 case S_IFLNK: 486 /* Catch special case of a non-dangling symlink. */ 487 if ((fts_options & FTS_LOGICAL) || 488 ((fts_options & FTS_COMFOLLOW) && 489 curr->fts_level == 0)) { 490 if (copy_file(curr, dne)) 491 badcp = rval = 1; 492 } else { 493 if (copy_link(curr, !dne)) 494 badcp = rval = 1; 495 } 496 break; 497 case S_IFDIR: 498 if (!Rflag) { 499 warnx("%s is a directory (not copied).", 500 curr->fts_path); 501 (void)fts_set(ftsp, curr, FTS_SKIP); 502 badcp = rval = 1; 503 break; 504 } 505 /* 506 * If the directory doesn't exist, create the new 507 * one with the from file mode plus owner RWX bits, 508 * modified by the umask. Trade-off between being 509 * able to write the directory (if from directory is 510 * 555) and not causing a permissions race. If the 511 * umask blocks owner writes, we fail. 512 */ 513 if (dne) { 514 if (mkdir(to.p_path, 515 curr->fts_statp->st_mode | S_IRWXU) < 0) 516 err(1, "%s", to.p_path); 517 /* 518 * First DNE with a NULL root_stat is the root 519 * path, so set root_stat. We can't really 520 * tell in all cases if the target path is 521 * within the src path, so we just stat() the 522 * first directory we created and use that. 523 */ 524 if (root_stat == NULL && 525 stat(to.p_path, &created_root_stat) == -1) { 526 err(1, "stat"); 527 } else if (root_stat == NULL) { 528 root_stat = &created_root_stat; 529 } 530 } else if (!S_ISDIR(to_stat.st_mode)) { 531 errno = ENOTDIR; 532 err(1, "%s", to.p_path); 533 } 534 /* 535 * Arrange to correct directory attributes later 536 * (in the post-order phase) if this is a new 537 * directory, or if the -p flag is in effect. 538 */ 539 curr->fts_number = pflag || dne; 540 break; 541 case S_IFBLK: 542 case S_IFCHR: 543 if (Rflag && !sflag) { 544 if (copy_special(curr->fts_statp, !dne)) 545 badcp = rval = 1; 546 } else { 547 if (copy_file(curr, dne)) 548 badcp = rval = 1; 549 } 550 break; 551 case S_IFSOCK: 552 warnx("%s is a socket (not copied).", 553 curr->fts_path); 554 break; 555 case S_IFIFO: 556 if (Rflag && !sflag) { 557 if (copy_fifo(curr->fts_statp, !dne)) 558 badcp = rval = 1; 559 } else { 560 if (copy_file(curr, dne)) 561 badcp = rval = 1; 562 } 563 break; 564 default: 565 if (copy_file(curr, dne)) 566 badcp = rval = 1; 567 break; 568 } 569 if (vflag && !badcp) 570 (void)printf("%s -> %s\n", curr->fts_path, to.p_path); 571 } 572 if (errno) 573 err(1, "fts_read"); 574 fts_close(ftsp); 575 free(recurse_path); 576 return (rval); 577 } 578 579 static void 580 siginfo(int sig __unused) 581 { 582 583 info = 1; 584 } 585