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 char rootname[NAME_MAX]; 296 struct stat created_root_stat, to_stat; 297 FTS *ftsp; 298 FTSENT *curr; 299 int base = 0, dne, badcp, rval; 300 size_t nlen; 301 char *p, *recurse_path, *target_mid; 302 mode_t mask, mode; 303 304 /* 305 * Keep an inverted copy of the umask, for use in correcting 306 * permissions on created directories when not using -p. 307 */ 308 mask = ~umask(0777); 309 umask(~mask); 310 311 recurse_path = NULL; 312 if ((ftsp = fts_open(argv, fts_options, NULL)) == NULL) 313 err(1, "fts_open"); 314 for (badcp = rval = 0; (curr = fts_read(ftsp)) != NULL; 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 /* 332 * Stash the root basename off for detecting recursion later. 333 * 334 * This will be essential if the root is a symlink and we're 335 * rolling with -L or -H. The later bits will need this bit in 336 * particular. 337 */ 338 if (curr->fts_level == FTS_ROOTLEVEL) { 339 strlcpy(rootname, curr->fts_name, sizeof(rootname)); 340 } 341 342 /* 343 * If we are in case (2) or (3) above, we need to append the 344 * source name to the target name. 345 */ 346 if (type != FILE_TO_FILE) { 347 /* 348 * Need to remember the roots of traversals to create 349 * correct pathnames. If there's a directory being 350 * copied to a non-existent directory, e.g. 351 * cp -R a/dir noexist 352 * the resulting path name should be noexist/foo, not 353 * noexist/dir/foo (where foo is a file in dir), which 354 * is the case where the target exists. 355 * 356 * Also, check for "..". This is for correct path 357 * concatenation for paths ending in "..", e.g. 358 * cp -R .. /tmp 359 * Paths ending in ".." are changed to ".". This is 360 * tricky, but seems the easiest way to fix the problem. 361 * 362 * XXX 363 * Since the first level MUST be FTS_ROOTLEVEL, base 364 * is always initialized. 365 */ 366 if (curr->fts_level == FTS_ROOTLEVEL) { 367 if (type != DIR_TO_DNE) { 368 p = strrchr(curr->fts_path, '/'); 369 base = (p == NULL) ? 0 : 370 (int)(p - curr->fts_path + 1); 371 372 if (!strcmp(&curr->fts_path[base], 373 "..")) 374 base += 1; 375 } else 376 base = curr->fts_pathlen; 377 } 378 379 p = &curr->fts_path[base]; 380 nlen = curr->fts_pathlen - base; 381 target_mid = to.target_end; 382 if (*p != '/' && target_mid[-1] != '/') 383 *target_mid++ = '/'; 384 *target_mid = 0; 385 if (target_mid - to.p_path + nlen >= PATH_MAX) { 386 warnx("%s%s: name too long (not copied)", 387 to.p_path, p); 388 badcp = rval = 1; 389 continue; 390 } 391 (void)strncat(target_mid, p, nlen); 392 to.p_end = target_mid + nlen; 393 *to.p_end = 0; 394 STRIP_TRAILING_SLASH(to); 395 396 /* 397 * We're on the verge of recursing on ourselves. Either 398 * we need to stop right here (we knowingly just created 399 * it), or we will in an immediate descendant. Record 400 * the path of the immediate descendant to make our 401 * lives a little less complicated looking. 402 */ 403 if (curr->fts_info == FTS_D && root_stat != NULL && 404 root_stat->st_dev == curr->fts_statp->st_dev && 405 root_stat->st_ino == curr->fts_statp->st_ino) { 406 assert(recurse_path == NULL); 407 408 if (root_stat == &created_root_stat) { 409 /* 410 * This directory didn't exist when we 411 * started, we created it as part of 412 * traversal. Stop right here before we 413 * do something silly. 414 */ 415 fts_set(ftsp, curr, FTS_SKIP); 416 continue; 417 } 418 419 420 if (asprintf(&recurse_path, "%s/%s", to.p_path, 421 rootname) == -1) 422 err(1, "asprintf"); 423 } 424 425 if (recurse_path != NULL && 426 strcmp(to.p_path, recurse_path) == 0) { 427 fts_set(ftsp, curr, FTS_SKIP); 428 continue; 429 } 430 } 431 432 if (curr->fts_info == FTS_DP) { 433 /* 434 * We are nearly finished with this directory. If we 435 * didn't actually copy it, or otherwise don't need to 436 * change its attributes, then we are done. 437 */ 438 if (!curr->fts_number) 439 continue; 440 /* 441 * If -p is in effect, set all the attributes. 442 * Otherwise, set the correct permissions, limited 443 * by the umask. Optimise by avoiding a chmod() 444 * if possible (which is usually the case if we 445 * made the directory). Note that mkdir() does not 446 * honour setuid, setgid and sticky bits, but we 447 * normally want to preserve them on directories. 448 */ 449 if (pflag) { 450 if (setfile(curr->fts_statp, -1)) 451 rval = 1; 452 if (preserve_dir_acls(curr->fts_statp, 453 curr->fts_accpath, to.p_path) != 0) 454 rval = 1; 455 } else { 456 mode = curr->fts_statp->st_mode; 457 if ((mode & (S_ISUID | S_ISGID | S_ISTXT)) || 458 ((mode | S_IRWXU) & mask) != (mode & mask)) 459 if (chmod(to.p_path, mode & mask) != 460 0) { 461 warn("chmod: %s", to.p_path); 462 rval = 1; 463 } 464 } 465 continue; 466 } 467 468 /* Not an error but need to remember it happened. */ 469 if (copy_stat(to.p_path, &to_stat) == -1) 470 dne = 1; 471 else { 472 if (to_stat.st_dev == curr->fts_statp->st_dev && 473 to_stat.st_ino == curr->fts_statp->st_ino) { 474 warnx("%s and %s are identical (not copied).", 475 to.p_path, curr->fts_path); 476 badcp = rval = 1; 477 if (S_ISDIR(curr->fts_statp->st_mode)) 478 (void)fts_set(ftsp, curr, FTS_SKIP); 479 continue; 480 } 481 if (!S_ISDIR(curr->fts_statp->st_mode) && 482 S_ISDIR(to_stat.st_mode)) { 483 warnx("cannot overwrite directory %s with " 484 "non-directory %s", 485 to.p_path, curr->fts_path); 486 badcp = rval = 1; 487 continue; 488 } 489 dne = 0; 490 } 491 492 switch (curr->fts_statp->st_mode & S_IFMT) { 493 case S_IFLNK: 494 /* Catch special case of a non-dangling symlink. */ 495 if ((fts_options & FTS_LOGICAL) || 496 ((fts_options & FTS_COMFOLLOW) && 497 curr->fts_level == 0)) { 498 if (copy_file(curr, dne)) 499 badcp = rval = 1; 500 } else { 501 if (copy_link(curr, !dne)) 502 badcp = rval = 1; 503 } 504 break; 505 case S_IFDIR: 506 if (!Rflag) { 507 warnx("%s is a directory (not copied).", 508 curr->fts_path); 509 (void)fts_set(ftsp, curr, FTS_SKIP); 510 badcp = rval = 1; 511 break; 512 } 513 /* 514 * If the directory doesn't exist, create the new 515 * one with the from file mode plus owner RWX bits, 516 * modified by the umask. Trade-off between being 517 * able to write the directory (if from directory is 518 * 555) and not causing a permissions race. If the 519 * umask blocks owner writes, we fail. 520 */ 521 if (dne) { 522 if (mkdir(to.p_path, 523 curr->fts_statp->st_mode | S_IRWXU) < 0) 524 err(1, "%s", to.p_path); 525 /* 526 * First DNE with a NULL root_stat is the root 527 * path, so set root_stat. We can't really 528 * tell in all cases if the target path is 529 * within the src path, so we just stat() the 530 * first directory we created and use that. 531 */ 532 if (root_stat == NULL && 533 stat(to.p_path, &created_root_stat) == -1) { 534 err(1, "stat"); 535 } else if (root_stat == NULL) { 536 root_stat = &created_root_stat; 537 } 538 } else if (!S_ISDIR(to_stat.st_mode)) { 539 errno = ENOTDIR; 540 err(1, "%s", to.p_path); 541 } 542 /* 543 * Arrange to correct directory attributes later 544 * (in the post-order phase) if this is a new 545 * directory, or if the -p flag is in effect. 546 */ 547 curr->fts_number = pflag || dne; 548 break; 549 case S_IFBLK: 550 case S_IFCHR: 551 if (Rflag && !sflag) { 552 if (copy_special(curr->fts_statp, !dne)) 553 badcp = rval = 1; 554 } else { 555 if (copy_file(curr, dne)) 556 badcp = rval = 1; 557 } 558 break; 559 case S_IFSOCK: 560 warnx("%s is a socket (not copied).", 561 curr->fts_path); 562 break; 563 case S_IFIFO: 564 if (Rflag && !sflag) { 565 if (copy_fifo(curr->fts_statp, !dne)) 566 badcp = rval = 1; 567 } else { 568 if (copy_file(curr, dne)) 569 badcp = rval = 1; 570 } 571 break; 572 default: 573 if (copy_file(curr, dne)) 574 badcp = rval = 1; 575 break; 576 } 577 if (vflag && !badcp) 578 (void)printf("%s -> %s\n", curr->fts_path, to.p_path); 579 } 580 if (errno) 581 err(1, "fts_read"); 582 fts_close(ftsp); 583 free(recurse_path); 584 return (rval); 585 } 586 587 static void 588 siginfo(int sig __unused) 589 { 590 591 info = 1; 592 } 593