1 /* $NetBSD: cp.c,v 1.51 2008/07/20 00:52:39 lukem Exp $ */ 2 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 #include <sys/cdefs.h> 36 #ifndef lint 37 __COPYRIGHT( 38 "@(#) Copyright (c) 1988, 1993, 1994\ 39 The Regents of the University of California. All rights reserved."); 40 #endif /* not lint */ 41 42 #ifndef lint 43 #if 0 44 static char sccsid[] = "@(#)cp.c 8.5 (Berkeley) 4/29/95"; 45 #else 46 __RCSID("$NetBSD: cp.c,v 1.51 2008/07/20 00:52:39 lukem Exp $"); 47 #endif 48 #endif /* not lint */ 49 50 /* 51 * Cp copies source files to target files. 52 * 53 * The global PATH_T structure "to" always contains the path to the 54 * current target file. Since fts(3) does not change directories, 55 * this path can be either absolute or dot-relative. 56 * 57 * The basic algorithm is to initialize "to" and use fts(3) to traverse 58 * the file hierarchy rooted in the argument list. A trivial case is the 59 * case of 'cp file1 file2'. The more interesting case is the case of 60 * 'cp file1 file2 ... fileN dir' where the hierarchy is traversed and the 61 * path (relative to the root of the traversal) is appended to dir (stored 62 * in "to") to form the final target path. 63 */ 64 65 #include <sys/param.h> 66 #include <sys/stat.h> 67 68 #include <err.h> 69 #include <errno.h> 70 #include <fts.h> 71 #include <locale.h> 72 #include <stdlib.h> 73 #include <stdio.h> 74 #include <string.h> 75 #include <unistd.h> 76 77 #include "extern.h" 78 79 #define STRIP_TRAILING_SLASH(p) { \ 80 while ((p).p_end > (p).p_path + 1 && (p).p_end[-1] == '/') \ 81 *--(p).p_end = '\0'; \ 82 } 83 84 static char empty[] = ""; 85 PATH_T to = { .p_end = to.p_path, .target_end = empty }; 86 87 uid_t myuid; 88 int Hflag, Lflag, Rflag, Pflag, fflag, iflag, pflag, rflag, vflag, Nflag; 89 mode_t myumask; 90 91 enum op { FILE_TO_FILE, FILE_TO_DIR, DIR_TO_DNE }; 92 93 int main(int, char *[]); 94 int copy(char *[], enum op, int); 95 int mastercmp(const FTSENT **, const FTSENT **); 96 97 int 98 main(int argc, char *argv[]) 99 { 100 struct stat to_stat, tmp_stat; 101 enum op type; 102 int ch, fts_options, r, have_trailing_slash; 103 char *target, **src; 104 105 setprogname(argv[0]); 106 (void)setlocale(LC_ALL, ""); 107 108 Hflag = Lflag = Pflag = Rflag = 0; 109 while ((ch = getopt(argc, argv, "HLNPRfiprv")) != -1) 110 switch (ch) { 111 case 'H': 112 Hflag = 1; 113 Lflag = Pflag = 0; 114 break; 115 case 'L': 116 Lflag = 1; 117 Hflag = Pflag = 0; 118 break; 119 case 'N': 120 Nflag = 1; 121 break; 122 case 'P': 123 Pflag = 1; 124 Hflag = Lflag = 0; 125 break; 126 case 'R': 127 Rflag = 1; 128 break; 129 case 'f': 130 fflag = 1; 131 iflag = 0; 132 break; 133 case 'i': 134 iflag = isatty(fileno(stdin)); 135 fflag = 0; 136 break; 137 case 'p': 138 pflag = 1; 139 break; 140 case 'r': 141 rflag = 1; 142 break; 143 case 'v': 144 vflag = 1; 145 break; 146 case '?': 147 default: 148 usage(); 149 /* NOTREACHED */ 150 } 151 argc -= optind; 152 argv += optind; 153 154 if (argc < 2) 155 usage(); 156 157 fts_options = FTS_NOCHDIR | FTS_PHYSICAL; 158 if (rflag) { 159 if (Rflag) { 160 errx(EXIT_FAILURE, 161 "the -R and -r options may not be specified together."); 162 /* NOTREACHED */ 163 } 164 if (Hflag || Lflag || Pflag) { 165 errx(EXIT_FAILURE, 166 "the -H, -L, and -P options may not be specified with the -r option."); 167 /* NOTREACHED */ 168 } 169 fts_options &= ~FTS_PHYSICAL; 170 fts_options |= FTS_LOGICAL; 171 } 172 173 if (Rflag) { 174 if (Hflag) 175 fts_options |= FTS_COMFOLLOW; 176 if (Lflag) { 177 fts_options &= ~FTS_PHYSICAL; 178 fts_options |= FTS_LOGICAL; 179 } 180 } else if (!Pflag) { 181 fts_options &= ~FTS_PHYSICAL; 182 fts_options |= FTS_LOGICAL | FTS_COMFOLLOW; 183 } 184 185 myuid = getuid(); 186 187 /* Copy the umask for explicit mode setting. */ 188 myumask = umask(0); 189 (void)umask(myumask); 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(EXIT_FAILURE, "%s: name too long", target); 195 to.p_end = to.p_path + strlen(to.p_path); 196 have_trailing_slash = (to.p_end[-1] == '/'); 197 if (have_trailing_slash) 198 STRIP_TRAILING_SLASH(to); 199 to.target_end = to.p_end; 200 201 /* Set end of argument list for fts(3). */ 202 argv[argc] = NULL; 203 204 /* 205 * Cp has two distinct cases: 206 * 207 * cp [-R] source target 208 * cp [-R] source1 ... sourceN directory 209 * 210 * In both cases, source can be either a file or a directory. 211 * 212 * In (1), the target becomes a copy of the source. That is, if the 213 * source is a file, the target will be a file, and likewise for 214 * directories. 215 * 216 * In (2), the real target is not directory, but "directory/source". 217 */ 218 if (Pflag) 219 r = lstat(to.p_path, &to_stat); 220 else 221 r = stat(to.p_path, &to_stat); 222 if (r == -1 && errno != ENOENT) { 223 err(EXIT_FAILURE, "%s", to.p_path); 224 /* NOTREACHED */ 225 } 226 if (r == -1 || !S_ISDIR(to_stat.st_mode)) { 227 /* 228 * Case (1). Target is not a directory. 229 */ 230 if (argc > 1) 231 usage(); 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 || (Rflag && (Lflag || Hflag))) 241 r = stat(*argv, &tmp_stat); 242 else 243 r = lstat(*argv, &tmp_stat); 244 if (r == -1) { 245 err(EXIT_FAILURE, "%s", *argv); 246 /* NOTREACHED */ 247 } 248 249 if (S_ISDIR(tmp_stat.st_mode) && (Rflag || rflag)) 250 type = DIR_TO_DNE; 251 else 252 type = FILE_TO_FILE; 253 } else 254 type = FILE_TO_FILE; 255 256 if (have_trailing_slash && type == FILE_TO_FILE) { 257 if (r == -1) 258 errx(1, "directory %s does not exist", 259 to.p_path); 260 else 261 errx(1, "%s is not a directory", to.p_path); 262 } 263 } else { 264 /* 265 * Case (2). Target is a directory. 266 */ 267 type = FILE_TO_DIR; 268 } 269 270 /* 271 * make "cp -rp src/ dst" behave like "cp -rp src dst" not 272 * like "cp -rp src/. dst" 273 */ 274 for (src = argv; *src; src++) { 275 size_t len = strlen(*src); 276 while (len-- > 1 && (*src)[len] == '/') 277 (*src)[len] = '\0'; 278 } 279 280 exit(copy(argv, type, fts_options)); 281 /* NOTREACHED */ 282 } 283 284 int 285 copy(char *argv[], enum op type, int fts_options) 286 { 287 struct stat to_stat; 288 FTS *ftsp; 289 FTSENT *curr; 290 int base, dne, sval; 291 int this_failed, any_failed; 292 size_t nlen; 293 char *p, *target_mid; 294 295 dne = 0; 296 base = 0; /* XXX gcc -Wuninitialized (see comment below) */ 297 298 if ((ftsp = fts_open(argv, fts_options, mastercmp)) == NULL) 299 err(EXIT_FAILURE, "%s", argv[0]); 300 /* NOTREACHED */ 301 for (any_failed = 0; (curr = fts_read(ftsp)) != NULL;) { 302 this_failed = 0; 303 switch (curr->fts_info) { 304 case FTS_NS: 305 case FTS_DNR: 306 case FTS_ERR: 307 warnx("%s: %s", curr->fts_path, 308 strerror(curr->fts_errno)); 309 this_failed = any_failed = 1; 310 continue; 311 case FTS_DC: /* Warn, continue. */ 312 warnx("%s: directory causes a cycle", curr->fts_path); 313 this_failed = any_failed = 1; 314 continue; 315 } 316 317 /* 318 * If we are in case (2) or (3) above, we need to append the 319 * source name to the target name. 320 */ 321 if (type != FILE_TO_FILE) { 322 if ((curr->fts_namelen + 323 to.target_end - to.p_path + 1) > MAXPATHLEN) { 324 warnx("%s/%s: name too long (not copied)", 325 to.p_path, curr->fts_name); 326 this_failed = any_failed = 1; 327 continue; 328 } 329 330 /* 331 * Need to remember the roots of traversals to create 332 * correct pathnames. If there's a directory being 333 * copied to a non-existent directory, e.g. 334 * cp -R a/dir noexist 335 * the resulting path name should be noexist/foo, not 336 * noexist/dir/foo (where foo is a file in dir), which 337 * is the case where the target exists. 338 * 339 * Also, check for "..". This is for correct path 340 * concatentation for paths ending in "..", e.g. 341 * cp -R .. /tmp 342 * Paths ending in ".." are changed to ".". This is 343 * tricky, but seems the easiest way to fix the problem. 344 * 345 * XXX 346 * Since the first level MUST be FTS_ROOTLEVEL, base 347 * is always initialized. 348 */ 349 if (curr->fts_level == FTS_ROOTLEVEL) { 350 if (type != DIR_TO_DNE) { 351 p = strrchr(curr->fts_path, '/'); 352 base = (p == NULL) ? 0 : 353 (int)(p - curr->fts_path + 1); 354 355 if (!strcmp(&curr->fts_path[base], 356 "..")) 357 base += 1; 358 } else 359 base = curr->fts_pathlen; 360 } 361 362 p = &curr->fts_path[base]; 363 nlen = curr->fts_pathlen - base; 364 target_mid = to.target_end; 365 if (*p != '/' && target_mid[-1] != '/') 366 *target_mid++ = '/'; 367 *target_mid = 0; 368 369 if (target_mid - to.p_path + nlen >= PATH_MAX) { 370 warnx("%s%s: name too long (not copied)", 371 to.p_path, p); 372 this_failed = any_failed = 1; 373 continue; 374 } 375 (void)strncat(target_mid, p, nlen); 376 to.p_end = target_mid + nlen; 377 *to.p_end = 0; 378 STRIP_TRAILING_SLASH(to); 379 } 380 381 sval = Pflag ? lstat(to.p_path, &to_stat) : stat(to.p_path, &to_stat); 382 /* Not an error but need to remember it happened */ 383 if (sval == -1) 384 dne = 1; 385 else { 386 if (to_stat.st_dev == curr->fts_statp->st_dev && 387 to_stat.st_ino == curr->fts_statp->st_ino) { 388 warnx("%s and %s are identical (not copied).", 389 to.p_path, curr->fts_path); 390 this_failed = any_failed = 1; 391 if (S_ISDIR(curr->fts_statp->st_mode)) 392 (void)fts_set(ftsp, curr, FTS_SKIP); 393 continue; 394 } 395 if (!S_ISDIR(curr->fts_statp->st_mode) && 396 S_ISDIR(to_stat.st_mode)) { 397 warnx("cannot overwrite directory %s with non-directory %s", 398 to.p_path, curr->fts_path); 399 this_failed = any_failed = 1; 400 continue; 401 } 402 if (!S_ISDIR(curr->fts_statp->st_mode)) 403 dne = 0; 404 } 405 406 switch (curr->fts_statp->st_mode & S_IFMT) { 407 case S_IFLNK: 408 /* Catch special case of a non dangling symlink */ 409 if((fts_options & FTS_LOGICAL) || 410 ((fts_options & FTS_COMFOLLOW) && curr->fts_level == 0)) { 411 if (copy_file(curr, dne)) 412 this_failed = any_failed = 1; 413 } else { 414 if (copy_link(curr, !dne)) 415 this_failed = any_failed = 1; 416 } 417 break; 418 case S_IFDIR: 419 if (!Rflag && !rflag) { 420 if (curr->fts_info == FTS_D) 421 warnx("%s is a directory (not copied).", 422 curr->fts_path); 423 (void)fts_set(ftsp, curr, FTS_SKIP); 424 this_failed = any_failed = 1; 425 break; 426 } 427 428 /* 429 * Directories get noticed twice: 430 * In the first pass, create it if needed. 431 * In the second pass, after the children have been copied, set the permissions. 432 */ 433 if (curr->fts_info == FTS_D) /* First pass */ 434 { 435 /* 436 * If the directory doesn't exist, create the new 437 * one with the from file mode plus owner RWX bits, 438 * modified by the umask. Trade-off between being 439 * able to write the directory (if from directory is 440 * 555) and not causing a permissions race. If the 441 * umask blocks owner writes, we fail.. 442 */ 443 if (dne) { 444 if (mkdir(to.p_path, 445 curr->fts_statp->st_mode | S_IRWXU) < 0) 446 err(EXIT_FAILURE, "%s", 447 to.p_path); 448 /* NOTREACHED */ 449 } else if (!S_ISDIR(to_stat.st_mode)) { 450 errno = ENOTDIR; 451 err(EXIT_FAILURE, "%s", 452 to.p_path); 453 /* NOTREACHED */ 454 } 455 } 456 else if (curr->fts_info == FTS_DP) /* Second pass */ 457 { 458 /* 459 * If not -p and directory didn't exist, set it to be 460 * the same as the from directory, umodified by the 461 * umask; arguably wrong, but it's been that way 462 * forever. 463 */ 464 if (pflag && setfile(curr->fts_statp, 0)) 465 this_failed = any_failed = 1; 466 else if (dne) 467 (void)chmod(to.p_path, 468 curr->fts_statp->st_mode); 469 470 /* 471 * Since this is the second pass, we already 472 * noted (and acted on) the existence of the 473 * directory. 474 */ 475 dne = 0; 476 } 477 else 478 { 479 warnx("directory %s encountered when not expected.", 480 curr->fts_path); 481 this_failed = any_failed = 1; 482 break; 483 } 484 485 break; 486 case S_IFBLK: 487 case S_IFCHR: 488 if (Rflag) { 489 if (copy_special(curr->fts_statp, !dne)) 490 this_failed = any_failed = 1; 491 } else 492 if (copy_file(curr, dne)) 493 this_failed = any_failed = 1; 494 break; 495 case S_IFIFO: 496 if (Rflag) { 497 if (copy_fifo(curr->fts_statp, !dne)) 498 this_failed = any_failed = 1; 499 } else 500 if (copy_file(curr, dne)) 501 this_failed = any_failed = 1; 502 break; 503 default: 504 if (copy_file(curr, dne)) 505 this_failed = any_failed = 1; 506 break; 507 } 508 if (vflag && !this_failed) 509 (void)printf("%s -> %s\n", curr->fts_path, to.p_path); 510 } 511 if (errno) { 512 err(EXIT_FAILURE, "fts_read"); 513 /* NOTREACHED */ 514 } 515 (void)fts_close(ftsp); 516 return (any_failed); 517 } 518 519 /* 520 * mastercmp -- 521 * The comparison function for the copy order. The order is to copy 522 * non-directory files before directory files. The reason for this 523 * is because files tend to be in the same cylinder group as their 524 * parent directory, whereas directories tend not to be. Copying the 525 * files first reduces seeking. 526 */ 527 int 528 mastercmp(const FTSENT **a, const FTSENT **b) 529 { 530 int a_info, b_info; 531 532 a_info = (*a)->fts_info; 533 if (a_info == FTS_ERR || a_info == FTS_NS || a_info == FTS_DNR) 534 return (0); 535 b_info = (*b)->fts_info; 536 if (b_info == FTS_ERR || b_info == FTS_NS || b_info == FTS_DNR) 537 return (0); 538 if (a_info == FTS_D) 539 return (-1); 540 if (b_info == FTS_D) 541 return (1); 542 return (0); 543 } 544