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 /* 48 * Cp copies source files to target files. 49 * 50 * The global PATH_T structure "to" always contains the path to the 51 * current target file. Since fts(3) does not change directories, 52 * this path can be either absolute or dot-relative. 53 * 54 * The basic algorithm is to initialize "to" and use fts(3) to traverse 55 * the file hierarchy rooted in the argument list. A trivial case is the 56 * case of 'cp file1 file2'. The more interesting case is the case of 57 * 'cp file1 file2 ... fileN dir' where the hierarchy is traversed and the 58 * path (relative to the root of the traversal) is appended to dir (stored 59 * in "to") to form the final target path. 60 */ 61 62 #include <sys/types.h> 63 #include <sys/stat.h> 64 65 #include <assert.h> 66 #include <err.h> 67 #include <errno.h> 68 #include <fts.h> 69 #include <limits.h> 70 #include <signal.h> 71 #include <stdio.h> 72 #include <stdlib.h> 73 #include <string.h> 74 #include <unistd.h> 75 76 #include "extern.h" 77 78 #define STRIP_TRAILING_SLASH(p) { \ 79 while ((p).p_end > (p).p_path + 1 && (p).p_end[-1] == '/') \ 80 *--(p).p_end = 0; \ 81 } 82 83 static char emptystring[] = ""; 84 85 PATH_T to = { to.p_path, emptystring, "" }; 86 87 int fflag, iflag, lflag, nflag, pflag, sflag, vflag; 88 static int Hflag, Lflag, Rflag, rflag; 89 volatile sig_atomic_t info; 90 91 enum op { FILE_TO_FILE, FILE_TO_DIR, DIR_TO_DNE }; 92 93 static int copy(char *[], enum op, int, struct stat *); 94 static void siginfo(int __unused); 95 96 int 97 main(int argc, char *argv[]) 98 { 99 struct stat to_stat, tmp_stat; 100 enum op type; 101 int Pflag, ch, fts_options, r, have_trailing_slash; 102 char *target; 103 104 fts_options = FTS_NOCHDIR | FTS_PHYSICAL; 105 Pflag = 0; 106 while ((ch = getopt(argc, argv, "HLPRafilnprsvx")) != -1) 107 switch (ch) { 108 case 'H': 109 Hflag = 1; 110 Lflag = Pflag = 0; 111 break; 112 case 'L': 113 Lflag = 1; 114 Hflag = Pflag = 0; 115 break; 116 case 'P': 117 Pflag = 1; 118 Hflag = Lflag = 0; 119 break; 120 case 'R': 121 Rflag = 1; 122 break; 123 case 'a': 124 pflag = 1; 125 Rflag = 1; 126 Pflag = 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 = Pflag = 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 if (!Pflag) { 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 /* Does the right thing based on -R + -H/-L/-P */ 275 static int 276 copy_stat(const char *path, struct stat *sb) 277 { 278 279 /* 280 * For -R -H/-P, we need to lstat() instead; copy() cares about the link 281 * itself rather than the target if we're not following links during the 282 * traversal. 283 */ 284 if (!Rflag || Lflag) 285 return (stat(path, sb)); 286 return (lstat(path, sb)); 287 } 288 289 290 static int 291 copy(char *argv[], enum op type, int fts_options, struct stat *root_stat) 292 { 293 char rootname[NAME_MAX]; 294 struct stat created_root_stat, to_stat; 295 FTS *ftsp; 296 FTSENT *curr; 297 int base = 0, dne, badcp, rval; 298 size_t nlen; 299 char *p, *recurse_path, *target_mid; 300 mode_t mask, mode; 301 302 /* 303 * Keep an inverted copy of the umask, for use in correcting 304 * permissions on created directories when not using -p. 305 */ 306 mask = ~umask(0777); 307 umask(~mask); 308 309 recurse_path = NULL; 310 if ((ftsp = fts_open(argv, fts_options, NULL)) == NULL) 311 err(1, "fts_open"); 312 for (badcp = rval = 0; (curr = fts_read(ftsp)) != NULL; badcp = 0) { 313 switch (curr->fts_info) { 314 case FTS_NS: 315 case FTS_DNR: 316 case FTS_ERR: 317 warnx("%s: %s", 318 curr->fts_path, strerror(curr->fts_errno)); 319 badcp = rval = 1; 320 continue; 321 case FTS_DC: /* Warn, continue. */ 322 warnx("%s: directory causes a cycle", curr->fts_path); 323 badcp = rval = 1; 324 continue; 325 default: 326 ; 327 } 328 329 /* 330 * Stash the root basename off for detecting recursion later. 331 * 332 * This will be essential if the root is a symlink and we're 333 * rolling with -L or -H. The later bits will need this bit in 334 * particular. 335 */ 336 if (curr->fts_level == FTS_ROOTLEVEL) { 337 strlcpy(rootname, curr->fts_name, sizeof(rootname)); 338 } 339 340 /* 341 * If we are in case (2) or (3) above, we need to append the 342 * source name to the target name. 343 */ 344 if (type != FILE_TO_FILE) { 345 /* 346 * Need to remember the roots of traversals to create 347 * correct pathnames. If there's a directory being 348 * copied to a non-existent directory, e.g. 349 * cp -R a/dir noexist 350 * the resulting path name should be noexist/foo, not 351 * noexist/dir/foo (where foo is a file in dir), which 352 * is the case where the target exists. 353 * 354 * Also, check for "..". This is for correct path 355 * concatenation for paths ending in "..", e.g. 356 * cp -R .. /tmp 357 * Paths ending in ".." are changed to ".". This is 358 * tricky, but seems the easiest way to fix the problem. 359 * 360 * XXX 361 * Since the first level MUST be FTS_ROOTLEVEL, base 362 * is always initialized. 363 */ 364 if (curr->fts_level == FTS_ROOTLEVEL) { 365 if (type != DIR_TO_DNE) { 366 p = strrchr(curr->fts_path, '/'); 367 base = (p == NULL) ? 0 : 368 (int)(p - curr->fts_path + 1); 369 370 if (!strcmp(&curr->fts_path[base], 371 "..")) 372 base += 1; 373 } else 374 base = curr->fts_pathlen; 375 } 376 377 p = &curr->fts_path[base]; 378 nlen = curr->fts_pathlen - base; 379 target_mid = to.target_end; 380 if (*p != '/' && target_mid[-1] != '/') 381 *target_mid++ = '/'; 382 *target_mid = 0; 383 if (target_mid - to.p_path + nlen >= PATH_MAX) { 384 warnx("%s%s: name too long (not copied)", 385 to.p_path, p); 386 badcp = rval = 1; 387 continue; 388 } 389 (void)strncat(target_mid, p, nlen); 390 to.p_end = target_mid + nlen; 391 *to.p_end = 0; 392 STRIP_TRAILING_SLASH(to); 393 394 /* 395 * We're on the verge of recursing on ourselves. Either 396 * we need to stop right here (we knowingly just created 397 * it), or we will in an immediate descendant. Record 398 * the path of the immediate descendant to make our 399 * lives a little less complicated looking. 400 */ 401 if (curr->fts_info == FTS_D && root_stat != NULL && 402 root_stat->st_dev == curr->fts_statp->st_dev && 403 root_stat->st_ino == curr->fts_statp->st_ino) { 404 assert(recurse_path == NULL); 405 406 if (root_stat == &created_root_stat) { 407 /* 408 * This directory didn't exist when we 409 * started, we created it as part of 410 * traversal. Stop right here before we 411 * do something silly. 412 */ 413 fts_set(ftsp, curr, FTS_SKIP); 414 continue; 415 } 416 417 418 if (asprintf(&recurse_path, "%s/%s", to.p_path, 419 rootname) == -1) 420 err(1, "asprintf"); 421 } 422 423 if (recurse_path != NULL && 424 strcmp(to.p_path, recurse_path) == 0) { 425 fts_set(ftsp, curr, FTS_SKIP); 426 continue; 427 } 428 } 429 430 if (curr->fts_info == FTS_DP) { 431 /* 432 * We are nearly finished with this directory. If we 433 * didn't actually copy it, or otherwise don't need to 434 * change its attributes, then we are done. 435 */ 436 if (!curr->fts_number) 437 continue; 438 /* 439 * If -p is in effect, set all the attributes. 440 * Otherwise, set the correct permissions, limited 441 * by the umask. Optimise by avoiding a chmod() 442 * if possible (which is usually the case if we 443 * made the directory). Note that mkdir() does not 444 * honour setuid, setgid and sticky bits, but we 445 * normally want to preserve them on directories. 446 */ 447 if (pflag) { 448 if (setfile(curr->fts_statp, -1)) 449 rval = 1; 450 if (preserve_dir_acls(curr->fts_statp, 451 curr->fts_accpath, to.p_path) != 0) 452 rval = 1; 453 } else { 454 mode = curr->fts_statp->st_mode; 455 if ((mode & (S_ISUID | S_ISGID | S_ISTXT)) || 456 ((mode | S_IRWXU) & mask) != (mode & mask)) 457 if (chmod(to.p_path, mode & mask) != 458 0) { 459 warn("chmod: %s", to.p_path); 460 rval = 1; 461 } 462 } 463 continue; 464 } 465 466 /* Not an error but need to remember it happened. */ 467 if (copy_stat(to.p_path, &to_stat) == -1) 468 dne = 1; 469 else { 470 if (to_stat.st_dev == curr->fts_statp->st_dev && 471 to_stat.st_ino == curr->fts_statp->st_ino) { 472 warnx("%s and %s are identical (not copied).", 473 to.p_path, curr->fts_path); 474 badcp = rval = 1; 475 if (S_ISDIR(curr->fts_statp->st_mode)) 476 (void)fts_set(ftsp, curr, FTS_SKIP); 477 continue; 478 } 479 if (!S_ISDIR(curr->fts_statp->st_mode) && 480 S_ISDIR(to_stat.st_mode)) { 481 warnx("cannot overwrite directory %s with " 482 "non-directory %s", 483 to.p_path, curr->fts_path); 484 badcp = rval = 1; 485 continue; 486 } 487 dne = 0; 488 } 489 490 switch (curr->fts_statp->st_mode & S_IFMT) { 491 case S_IFLNK: 492 /* Catch special case of a non-dangling symlink. */ 493 if ((fts_options & FTS_LOGICAL) || 494 ((fts_options & FTS_COMFOLLOW) && 495 curr->fts_level == 0)) { 496 if (copy_file(curr, dne)) 497 badcp = rval = 1; 498 } else { 499 if (copy_link(curr, !dne)) 500 badcp = rval = 1; 501 } 502 break; 503 case S_IFDIR: 504 if (!Rflag) { 505 warnx("%s is a directory (not copied).", 506 curr->fts_path); 507 (void)fts_set(ftsp, curr, FTS_SKIP); 508 badcp = rval = 1; 509 break; 510 } 511 /* 512 * If the directory doesn't exist, create the new 513 * one with the from file mode plus owner RWX bits, 514 * modified by the umask. Trade-off between being 515 * able to write the directory (if from directory is 516 * 555) and not causing a permissions race. If the 517 * umask blocks owner writes, we fail. 518 */ 519 if (dne) { 520 if (mkdir(to.p_path, 521 curr->fts_statp->st_mode | S_IRWXU) < 0) 522 err(1, "%s", to.p_path); 523 /* 524 * First DNE with a NULL root_stat is the root 525 * path, so set root_stat. We can't really 526 * tell in all cases if the target path is 527 * within the src path, so we just stat() the 528 * first directory we created and use that. 529 */ 530 if (root_stat == NULL && 531 stat(to.p_path, &created_root_stat) == -1) { 532 err(1, "stat"); 533 } else if (root_stat == NULL) { 534 root_stat = &created_root_stat; 535 } 536 } else if (!S_ISDIR(to_stat.st_mode)) { 537 errno = ENOTDIR; 538 err(1, "%s", to.p_path); 539 } 540 /* 541 * Arrange to correct directory attributes later 542 * (in the post-order phase) if this is a new 543 * directory, or if the -p flag is in effect. 544 */ 545 curr->fts_number = pflag || dne; 546 break; 547 case S_IFBLK: 548 case S_IFCHR: 549 if (Rflag && !sflag) { 550 if (copy_special(curr->fts_statp, !dne)) 551 badcp = rval = 1; 552 } else { 553 if (copy_file(curr, dne)) 554 badcp = rval = 1; 555 } 556 break; 557 case S_IFSOCK: 558 warnx("%s is a socket (not copied).", 559 curr->fts_path); 560 break; 561 case S_IFIFO: 562 if (Rflag && !sflag) { 563 if (copy_fifo(curr->fts_statp, !dne)) 564 badcp = rval = 1; 565 } else { 566 if (copy_file(curr, dne)) 567 badcp = rval = 1; 568 } 569 break; 570 default: 571 if (copy_file(curr, dne)) 572 badcp = rval = 1; 573 break; 574 } 575 if (vflag && !badcp) 576 (void)printf("%s -> %s\n", curr->fts_path, to.p_path); 577 } 578 if (errno) 579 err(1, "fts_read"); 580 fts_close(ftsp); 581 free(recurse_path); 582 return (rval); 583 } 584 585 static void 586 siginfo(int sig __unused) 587 { 588 589 info = 1; 590 } 591