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 Pflag, ch, fts_options, r, have_trailing_slash; 104 char *target; 105 106 fts_options = FTS_NOCHDIR | FTS_PHYSICAL; 107 Pflag = 0; 108 while ((ch = getopt(argc, argv, "HLPRafilnprsvx")) != -1) 109 switch (ch) { 110 case 'H': 111 Hflag = 1; 112 Lflag = Pflag = 0; 113 break; 114 case 'L': 115 Lflag = 1; 116 Hflag = Pflag = 0; 117 break; 118 case 'P': 119 Pflag = 1; 120 Hflag = Lflag = 0; 121 break; 122 case 'R': 123 Rflag = 1; 124 break; 125 case 'a': 126 pflag = 1; 127 Rflag = 1; 128 Pflag = 1; 129 Hflag = Lflag = 0; 130 break; 131 case 'f': 132 fflag = 1; 133 iflag = nflag = 0; 134 break; 135 case 'i': 136 iflag = 1; 137 fflag = nflag = 0; 138 break; 139 case 'l': 140 lflag = 1; 141 break; 142 case 'n': 143 nflag = 1; 144 fflag = iflag = 0; 145 break; 146 case 'p': 147 pflag = 1; 148 break; 149 case 'r': 150 rflag = Lflag = 1; 151 Hflag = Pflag = 0; 152 break; 153 case 's': 154 sflag = 1; 155 break; 156 case 'v': 157 vflag = 1; 158 break; 159 case 'x': 160 fts_options |= FTS_XDEV; 161 break; 162 default: 163 usage(); 164 break; 165 } 166 argc -= optind; 167 argv += optind; 168 169 if (argc < 2) 170 usage(); 171 172 if (Rflag && rflag) 173 errx(1, "the -R and -r options may not be specified together"); 174 if (lflag && sflag) 175 errx(1, "the -l and -s options may not be specified together"); 176 if (rflag) 177 Rflag = 1; 178 if (Rflag) { 179 if (Hflag) 180 fts_options |= FTS_COMFOLLOW; 181 if (Lflag) { 182 fts_options &= ~FTS_PHYSICAL; 183 fts_options |= FTS_LOGICAL; 184 } 185 } else if (!Pflag) { 186 fts_options &= ~FTS_PHYSICAL; 187 fts_options |= FTS_LOGICAL | FTS_COMFOLLOW; 188 } 189 (void)signal(SIGINFO, siginfo); 190 191 /* Save the target base in "to". */ 192 target = argv[--argc]; 193 if (strlcpy(to.p_path, target, sizeof(to.p_path)) >= sizeof(to.p_path)) 194 errx(1, "%s: name too long", target); 195 to.p_end = to.p_path + strlen(to.p_path); 196 if (to.p_path == to.p_end) { 197 *to.p_end++ = '.'; 198 *to.p_end = 0; 199 } 200 have_trailing_slash = (to.p_end[-1] == '/'); 201 if (have_trailing_slash) 202 STRIP_TRAILING_SLASH(to); 203 to.target_end = to.p_end; 204 205 /* Set end of argument list for fts(3). */ 206 argv[argc] = NULL; 207 208 /* 209 * Cp has two distinct cases: 210 * 211 * cp [-R] source target 212 * cp [-R] source1 ... sourceN directory 213 * 214 * In both cases, source can be either a file or a directory. 215 * 216 * In (1), the target becomes a copy of the source. That is, if the 217 * source is a file, the target will be a file, and likewise for 218 * directories. 219 * 220 * In (2), the real target is not directory, but "directory/source". 221 */ 222 r = stat(to.p_path, &to_stat); 223 if (r == -1 && errno != ENOENT) 224 err(1, "%s", to.p_path); 225 if (r == -1 || !S_ISDIR(to_stat.st_mode)) { 226 /* 227 * Case (1). Target is not a directory. 228 */ 229 if (argc > 1) 230 errx(1, "%s is not a directory", to.p_path); 231 232 /* 233 * Need to detect the case: 234 * cp -R dir foo 235 * Where dir is a directory and foo does not exist, where 236 * we want pathname concatenations turned on but not for 237 * the initial mkdir(). 238 */ 239 if (r == -1) { 240 if (Rflag && (Lflag || Hflag)) 241 stat(*argv, &tmp_stat); 242 else 243 lstat(*argv, &tmp_stat); 244 245 if (S_ISDIR(tmp_stat.st_mode) && Rflag) 246 type = DIR_TO_DNE; 247 else 248 type = FILE_TO_FILE; 249 } else 250 type = FILE_TO_FILE; 251 252 if (have_trailing_slash && type == FILE_TO_FILE) { 253 if (r == -1) { 254 errx(1, "directory %s does not exist", 255 to.p_path); 256 } else 257 errx(1, "%s is not a directory", to.p_path); 258 } 259 } else 260 /* 261 * Case (2). Target is a directory. 262 */ 263 type = FILE_TO_DIR; 264 265 /* 266 * For DIR_TO_DNE, we could provide copy() with the to_stat we've 267 * already allocated on the stack here that isn't being used for 268 * anything. Not doing so, though, simplifies later logic a little bit 269 * as we need to skip checking root_stat on the first iteration and 270 * ensure that we set it with the first mkdir(). 271 */ 272 exit (copy(argv, type, fts_options, (type == DIR_TO_DNE ? NULL : 273 &to_stat))); 274 } 275 276 /* Does the right thing based on -R + -H/-L/-P */ 277 static int 278 copy_stat(const char *path, struct stat *sb) 279 { 280 281 /* 282 * For -R -H/-P, we need to lstat() instead; copy() cares about the link 283 * itself rather than the target if we're not following links during the 284 * traversal. 285 */ 286 if (!Rflag || Lflag) 287 return (stat(path, sb)); 288 return (lstat(path, sb)); 289 } 290 291 292 static int 293 copy(char *argv[], enum op type, int fts_options, struct stat *root_stat) 294 { 295 struct stat created_root_stat, to_stat; 296 FTS *ftsp; 297 FTSENT *curr; 298 int base = 0, dne, badcp, rval; 299 size_t nlen; 300 char *p, *recurse_path, *target_mid; 301 mode_t mask, mode; 302 303 /* 304 * Keep an inverted copy of the umask, for use in correcting 305 * permissions on created directories when not using -p. 306 */ 307 mask = ~umask(0777); 308 umask(~mask); 309 310 recurse_path = NULL; 311 if ((ftsp = fts_open(argv, fts_options, NULL)) == NULL) 312 err(1, "fts_open"); 313 for (badcp = rval = 0; errno = 0, (curr = fts_read(ftsp)) != NULL; 314 badcp = 0) { 315 switch (curr->fts_info) { 316 case FTS_NS: 317 case FTS_DNR: 318 case FTS_ERR: 319 warnx("%s: %s", 320 curr->fts_path, strerror(curr->fts_errno)); 321 badcp = rval = 1; 322 continue; 323 case FTS_DC: /* Warn, continue. */ 324 warnx("%s: directory causes a cycle", curr->fts_path); 325 badcp = rval = 1; 326 continue; 327 default: 328 ; 329 } 330 331 if (curr->fts_info == FTS_D && type != FILE_TO_FILE && 332 root_stat != NULL && 333 root_stat->st_dev == curr->fts_statp->st_dev && 334 root_stat->st_ino == curr->fts_statp->st_ino) { 335 assert(recurse_path == NULL); 336 if (curr->fts_level > FTS_ROOTLEVEL) { 337 /* 338 * If the recursion isn't at the immediate 339 * level, we can just not traverse into this 340 * directory. 341 */ 342 fts_set(ftsp, curr, FTS_SKIP); 343 continue; 344 } else { 345 const char *slash; 346 347 /* 348 * Grab the last path component and double it, 349 * to make life easier later and ensure that 350 * we work even with fts_level == 0 is a couple 351 * of components deep in fts_path. No path 352 * separators are fine and expected in the 353 * common case, though. 354 */ 355 slash = strrchr(curr->fts_path, '/'); 356 if (slash != NULL) 357 slash++; 358 else 359 slash = curr->fts_path; 360 if (asprintf(&recurse_path, "%s/%s", 361 curr->fts_path, slash) == -1) 362 err(1, "asprintf"); 363 } 364 } 365 366 if (recurse_path != NULL && 367 strcmp(curr->fts_path, recurse_path) == 0) { 368 fts_set(ftsp, curr, FTS_SKIP); 369 continue; 370 } 371 372 /* 373 * If we are in case (2) or (3) above, we need to append the 374 * source name to the target name. 375 */ 376 if (type != FILE_TO_FILE) { 377 /* 378 * Need to remember the roots of traversals to create 379 * correct pathnames. If there's a directory being 380 * copied to a non-existent directory, e.g. 381 * cp -R a/dir noexist 382 * the resulting path name should be noexist/foo, not 383 * noexist/dir/foo (where foo is a file in dir), which 384 * is the case where the target exists. 385 * 386 * Also, check for "..". This is for correct path 387 * concatenation for paths ending in "..", e.g. 388 * cp -R .. /tmp 389 * Paths ending in ".." are changed to ".". This is 390 * tricky, but seems the easiest way to fix the problem. 391 * 392 * XXX 393 * Since the first level MUST be FTS_ROOTLEVEL, base 394 * is always initialized. 395 */ 396 if (curr->fts_level == FTS_ROOTLEVEL) { 397 if (type != DIR_TO_DNE) { 398 p = strrchr(curr->fts_path, '/'); 399 base = (p == NULL) ? 0 : 400 (int)(p - curr->fts_path + 1); 401 402 if (!strcmp(&curr->fts_path[base], 403 "..")) 404 base += 1; 405 } else 406 base = curr->fts_pathlen; 407 } 408 409 p = &curr->fts_path[base]; 410 nlen = curr->fts_pathlen - base; 411 target_mid = to.target_end; 412 if (*p != '/' && target_mid[-1] != '/') 413 *target_mid++ = '/'; 414 *target_mid = 0; 415 if (target_mid - to.p_path + nlen >= PATH_MAX) { 416 warnx("%s%s: name too long (not copied)", 417 to.p_path, p); 418 badcp = rval = 1; 419 continue; 420 } 421 (void)strncat(target_mid, p, nlen); 422 to.p_end = target_mid + nlen; 423 *to.p_end = 0; 424 STRIP_TRAILING_SLASH(to); 425 } 426 427 if (curr->fts_info == FTS_DP) { 428 /* 429 * We are nearly finished with this directory. If we 430 * didn't actually copy it, or otherwise don't need to 431 * change its attributes, then we are done. 432 */ 433 if (!curr->fts_number) 434 continue; 435 /* 436 * If -p is in effect, set all the attributes. 437 * Otherwise, set the correct permissions, limited 438 * by the umask. Optimise by avoiding a chmod() 439 * if possible (which is usually the case if we 440 * made the directory). Note that mkdir() does not 441 * honour setuid, setgid and sticky bits, but we 442 * normally want to preserve them on directories. 443 */ 444 if (pflag) { 445 if (setfile(curr->fts_statp, -1)) 446 rval = 1; 447 if (preserve_dir_acls(curr->fts_statp, 448 curr->fts_accpath, to.p_path) != 0) 449 rval = 1; 450 } else { 451 mode = curr->fts_statp->st_mode; 452 if ((mode & (S_ISUID | S_ISGID | S_ISTXT)) || 453 ((mode | S_IRWXU) & mask) != (mode & mask)) 454 if (chmod(to.p_path, mode & mask) != 455 0) { 456 warn("chmod: %s", to.p_path); 457 rval = 1; 458 } 459 } 460 continue; 461 } 462 463 /* Not an error but need to remember it happened. */ 464 if (copy_stat(to.p_path, &to_stat) == -1) 465 dne = 1; 466 else { 467 if (to_stat.st_dev == curr->fts_statp->st_dev && 468 to_stat.st_ino == curr->fts_statp->st_ino) { 469 warnx("%s and %s are identical (not copied).", 470 to.p_path, curr->fts_path); 471 badcp = rval = 1; 472 if (S_ISDIR(curr->fts_statp->st_mode)) 473 (void)fts_set(ftsp, curr, FTS_SKIP); 474 continue; 475 } 476 if (!S_ISDIR(curr->fts_statp->st_mode) && 477 S_ISDIR(to_stat.st_mode)) { 478 warnx("cannot overwrite directory %s with " 479 "non-directory %s", 480 to.p_path, curr->fts_path); 481 badcp = rval = 1; 482 continue; 483 } 484 dne = 0; 485 } 486 487 switch (curr->fts_statp->st_mode & S_IFMT) { 488 case S_IFLNK: 489 /* Catch special case of a non-dangling symlink. */ 490 if ((fts_options & FTS_LOGICAL) || 491 ((fts_options & FTS_COMFOLLOW) && 492 curr->fts_level == 0)) { 493 if (copy_file(curr, dne)) 494 badcp = rval = 1; 495 } else { 496 if (copy_link(curr, !dne)) 497 badcp = rval = 1; 498 } 499 break; 500 case S_IFDIR: 501 if (!Rflag) { 502 warnx("%s is a directory (not copied).", 503 curr->fts_path); 504 (void)fts_set(ftsp, curr, FTS_SKIP); 505 badcp = rval = 1; 506 break; 507 } 508 /* 509 * If the directory doesn't exist, create the new 510 * one with the from file mode plus owner RWX bits, 511 * modified by the umask. Trade-off between being 512 * able to write the directory (if from directory is 513 * 555) and not causing a permissions race. If the 514 * umask blocks owner writes, we fail. 515 */ 516 if (dne) { 517 if (mkdir(to.p_path, 518 curr->fts_statp->st_mode | S_IRWXU) < 0) 519 err(1, "%s", to.p_path); 520 /* 521 * First DNE with a NULL root_stat is the root 522 * path, so set root_stat. We can't really 523 * tell in all cases if the target path is 524 * within the src path, so we just stat() the 525 * first directory we created and use that. 526 */ 527 if (root_stat == NULL && 528 stat(to.p_path, &created_root_stat) == -1) { 529 err(1, "stat"); 530 } else if (root_stat == NULL) { 531 root_stat = &created_root_stat; 532 } 533 } else if (!S_ISDIR(to_stat.st_mode)) { 534 errno = ENOTDIR; 535 err(1, "%s", to.p_path); 536 } 537 /* 538 * Arrange to correct directory attributes later 539 * (in the post-order phase) if this is a new 540 * directory, or if the -p flag is in effect. 541 */ 542 curr->fts_number = pflag || dne; 543 break; 544 case S_IFBLK: 545 case S_IFCHR: 546 if (Rflag && !sflag) { 547 if (copy_special(curr->fts_statp, !dne)) 548 badcp = rval = 1; 549 } else { 550 if (copy_file(curr, dne)) 551 badcp = rval = 1; 552 } 553 break; 554 case S_IFSOCK: 555 warnx("%s is a socket (not copied).", 556 curr->fts_path); 557 break; 558 case S_IFIFO: 559 if (Rflag && !sflag) { 560 if (copy_fifo(curr->fts_statp, !dne)) 561 badcp = rval = 1; 562 } else { 563 if (copy_file(curr, dne)) 564 badcp = rval = 1; 565 } 566 break; 567 default: 568 if (copy_file(curr, dne)) 569 badcp = rval = 1; 570 break; 571 } 572 if (vflag && !badcp) 573 (void)printf("%s -> %s\n", curr->fts_path, to.p_path); 574 } 575 if (errno) 576 err(1, "fts_read"); 577 fts_close(ftsp); 578 free(recurse_path); 579 return (rval); 580 } 581 582 static void 583 siginfo(int sig __unused) 584 { 585 586 info = 1; 587 } 588