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