1 /* $NetBSD: cp.c,v 1.48 2006/12/26 00:13:24 alc 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\n\ 39 The Regents of the University of California. All rights reserved.\n"); 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 1.48 2006/12/26 00:13:24 alc 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 (void)setlocale(LC_ALL, ""); 106 107 Hflag = Lflag = Pflag = Rflag = 0; 108 while ((ch = getopt(argc, argv, "HLNPRfiprv")) != -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 'N': 119 Nflag = 1; 120 break; 121 case 'P': 122 Pflag = 1; 123 Hflag = Lflag = 0; 124 break; 125 case 'R': 126 Rflag = 1; 127 break; 128 case 'f': 129 fflag = 1; 130 iflag = 0; 131 break; 132 case 'i': 133 iflag = isatty(fileno(stdin)); 134 fflag = 0; 135 break; 136 case 'p': 137 pflag = 1; 138 break; 139 case 'r': 140 rflag = 1; 141 break; 142 case 'v': 143 vflag = 1; 144 break; 145 case '?': 146 default: 147 usage(); 148 /* NOTREACHED */ 149 } 150 argc -= optind; 151 argv += optind; 152 153 if (argc < 2) 154 usage(); 155 156 fts_options = FTS_NOCHDIR | FTS_PHYSICAL; 157 if (rflag) { 158 if (Rflag) { 159 errx(EXIT_FAILURE, 160 "the -R and -r options may not be specified together."); 161 /* NOTREACHED */ 162 } 163 if (Hflag || Lflag || Pflag) { 164 errx(EXIT_FAILURE, 165 "the -H, -L, and -P options may not be specified with the -r option."); 166 /* NOTREACHED */ 167 } 168 fts_options &= ~FTS_PHYSICAL; 169 fts_options |= FTS_LOGICAL; 170 } 171 172 if (Rflag) { 173 if (Hflag) 174 fts_options |= FTS_COMFOLLOW; 175 if (Lflag) { 176 fts_options &= ~FTS_PHYSICAL; 177 fts_options |= FTS_LOGICAL; 178 } 179 } else if (!Pflag) { 180 fts_options &= ~FTS_PHYSICAL; 181 fts_options |= FTS_LOGICAL | FTS_COMFOLLOW; 182 } 183 184 myuid = getuid(); 185 186 /* Copy the umask for explicit mode setting. */ 187 myumask = umask(0); 188 (void)umask(myumask); 189 190 /* Save the target base in "to". */ 191 target = argv[--argc]; 192 if (strlcpy(to.p_path, target, sizeof(to.p_path)) >= sizeof(to.p_path)) 193 errx(EXIT_FAILURE, "%s: name too long", target); 194 to.p_end = to.p_path + strlen(to.p_path); 195 have_trailing_slash = (to.p_end[-1] == '/'); 196 if (have_trailing_slash) 197 STRIP_TRAILING_SLASH(to); 198 to.target_end = to.p_end; 199 200 /* Set end of argument list for fts(3). */ 201 argv[argc] = NULL; 202 203 /* 204 * Cp has two distinct cases: 205 * 206 * cp [-R] source target 207 * cp [-R] source1 ... sourceN directory 208 * 209 * In both cases, source can be either a file or a directory. 210 * 211 * In (1), the target becomes a copy of the source. That is, if the 212 * source is a file, the target will be a file, and likewise for 213 * directories. 214 * 215 * In (2), the real target is not directory, but "directory/source". 216 */ 217 if (Pflag) 218 r = lstat(to.p_path, &to_stat); 219 else 220 r = stat(to.p_path, &to_stat); 221 if (r == -1 && errno != ENOENT) { 222 err(EXIT_FAILURE, "%s", to.p_path); 223 /* NOTREACHED */ 224 } 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 usage(); 231 /* 232 * Need to detect the case: 233 * cp -R dir foo 234 * Where dir is a directory and foo does not exist, where 235 * we want pathname concatenations turned on but not for 236 * the initial mkdir(). 237 */ 238 if (r == -1) { 239 if (rflag || (Rflag && (Lflag || Hflag))) 240 r = stat(*argv, &tmp_stat); 241 else 242 r = lstat(*argv, &tmp_stat); 243 if (r == -1) { 244 err(EXIT_FAILURE, "%s", *argv); 245 /* NOTREACHED */ 246 } 247 248 if (S_ISDIR(tmp_stat.st_mode) && (Rflag || rflag)) 249 type = DIR_TO_DNE; 250 else 251 type = FILE_TO_FILE; 252 } else 253 type = FILE_TO_FILE; 254 255 if (have_trailing_slash && type == FILE_TO_FILE) { 256 if (r == -1) 257 errx(1, "directory %s does not exist", 258 to.p_path); 259 else 260 errx(1, "%s is not a directory", to.p_path); 261 } 262 } else { 263 /* 264 * Case (2). Target is a directory. 265 */ 266 type = FILE_TO_DIR; 267 } 268 269 /* 270 * make "cp -rp src/ dst" behave like "cp -rp src dst" not 271 * like "cp -rp src/. dst" 272 */ 273 for (src = argv; *src; src++) { 274 size_t len = strlen(*src); 275 while (len-- > 1 && (*src)[len] == '/') 276 (*src)[len] = '\0'; 277 } 278 279 exit(copy(argv, type, fts_options)); 280 /* NOTREACHED */ 281 } 282 283 int 284 copy(char *argv[], enum op type, int fts_options) 285 { 286 struct stat to_stat; 287 FTS *ftsp; 288 FTSENT *curr; 289 int base, dne, rval, sval; 290 size_t nlen; 291 char *p, *target_mid; 292 293 dne = 0; 294 base = 0; /* XXX gcc -Wuninitialized (see comment below) */ 295 296 if ((ftsp = fts_open(argv, fts_options, mastercmp)) == NULL) 297 err(EXIT_FAILURE, "%s", argv[0]); 298 /* NOTREACHED */ 299 for (rval = 0; (curr = fts_read(ftsp)) != NULL;) { 300 switch (curr->fts_info) { 301 case FTS_NS: 302 case FTS_DNR: 303 case FTS_ERR: 304 warnx("%s: %s", curr->fts_path, 305 strerror(curr->fts_errno)); 306 rval = 1; 307 continue; 308 case FTS_DC: /* Warn, continue. */ 309 warnx("%s: directory causes a cycle", curr->fts_path); 310 rval = 1; 311 continue; 312 } 313 314 /* 315 * If we are in case (2) or (3) above, we need to append the 316 * source name to the target name. 317 */ 318 if (type != FILE_TO_FILE) { 319 if ((curr->fts_namelen + 320 to.target_end - to.p_path + 1) > MAXPATHLEN) { 321 warnx("%s/%s: name too long (not copied)", 322 to.p_path, curr->fts_name); 323 rval = 1; 324 continue; 325 } 326 327 /* 328 * Need to remember the roots of traversals to create 329 * correct pathnames. If there's a directory being 330 * copied to a non-existent directory, e.g. 331 * cp -R a/dir noexist 332 * the resulting path name should be noexist/foo, not 333 * noexist/dir/foo (where foo is a file in dir), which 334 * is the case where the target exists. 335 * 336 * Also, check for "..". This is for correct path 337 * concatentation for paths ending in "..", e.g. 338 * cp -R .. /tmp 339 * Paths ending in ".." are changed to ".". This is 340 * tricky, but seems the easiest way to fix the problem. 341 * 342 * XXX 343 * Since the first level MUST be FTS_ROOTLEVEL, base 344 * is always initialized. 345 */ 346 if (curr->fts_level == FTS_ROOTLEVEL) { 347 if (type != DIR_TO_DNE) { 348 p = strrchr(curr->fts_path, '/'); 349 base = (p == NULL) ? 0 : 350 (int)(p - curr->fts_path + 1); 351 352 if (!strcmp(&curr->fts_path[base], 353 "..")) 354 base += 1; 355 } else 356 base = curr->fts_pathlen; 357 } 358 359 p = &curr->fts_path[base]; 360 nlen = curr->fts_pathlen - base; 361 target_mid = to.target_end; 362 if (*p != '/' && target_mid[-1] != '/') 363 *target_mid++ = '/'; 364 *target_mid = 0; 365 366 if (target_mid - to.p_path + nlen >= PATH_MAX) { 367 warnx("%s%s: name too long (not copied)", 368 to.p_path, p); 369 rval = 1; 370 continue; 371 } 372 (void)strncat(target_mid, p, nlen); 373 to.p_end = target_mid + nlen; 374 *to.p_end = 0; 375 STRIP_TRAILING_SLASH(to); 376 } 377 378 sval = Pflag ? lstat(to.p_path, &to_stat) : stat(to.p_path, &to_stat); 379 /* Not an error but need to remember it happened */ 380 if (sval == -1) 381 dne = 1; 382 else { 383 if (to_stat.st_dev == curr->fts_statp->st_dev && 384 to_stat.st_ino == curr->fts_statp->st_ino) { 385 warnx("%s and %s are identical (not copied).", 386 to.p_path, curr->fts_path); 387 rval = 1; 388 if (S_ISDIR(curr->fts_statp->st_mode)) 389 (void)fts_set(ftsp, curr, FTS_SKIP); 390 continue; 391 } 392 if (!S_ISDIR(curr->fts_statp->st_mode) && 393 S_ISDIR(to_stat.st_mode)) { 394 warnx("cannot overwrite directory %s with non-directory %s", 395 to.p_path, curr->fts_path); 396 rval = 1; 397 continue; 398 } 399 if (!S_ISDIR(curr->fts_statp->st_mode)) 400 dne = 0; 401 } 402 403 switch (curr->fts_statp->st_mode & S_IFMT) { 404 case S_IFLNK: 405 /* Catch special case of a non dangling symlink */ 406 if((fts_options & FTS_LOGICAL) || 407 ((fts_options & FTS_COMFOLLOW) && curr->fts_level == 0)) { 408 if (copy_file(curr, dne)) 409 rval = 1; 410 } else { 411 if (copy_link(curr, !dne)) 412 rval = 1; 413 } 414 break; 415 case S_IFDIR: 416 if (!Rflag && !rflag) { 417 if (curr->fts_info == FTS_D) 418 warnx("%s is a directory (not copied).", 419 curr->fts_path); 420 (void)fts_set(ftsp, curr, FTS_SKIP); 421 rval = 1; 422 break; 423 } 424 425 /* 426 * Directories get noticed twice: 427 * In the first pass, create it if needed. 428 * In the second pass, after the children have been copied, set the permissions. 429 */ 430 if (curr->fts_info == FTS_D) /* First pass */ 431 { 432 /* 433 * If the directory doesn't exist, create the new 434 * one with the from file mode plus owner RWX bits, 435 * modified by the umask. Trade-off between being 436 * able to write the directory (if from directory is 437 * 555) and not causing a permissions race. If the 438 * umask blocks owner writes, we fail.. 439 */ 440 if (dne) { 441 if (mkdir(to.p_path, 442 curr->fts_statp->st_mode | S_IRWXU) < 0) 443 err(EXIT_FAILURE, "%s", 444 to.p_path); 445 /* NOTREACHED */ 446 } else if (!S_ISDIR(to_stat.st_mode)) { 447 errno = ENOTDIR; 448 err(EXIT_FAILURE, "%s", 449 to.p_path); 450 /* NOTREACHED */ 451 } 452 } 453 else if (curr->fts_info == FTS_DP) /* Second pass */ 454 { 455 /* 456 * If not -p and directory didn't exist, set it to be 457 * the same as the from directory, umodified by the 458 * umask; arguably wrong, but it's been that way 459 * forever. 460 */ 461 if (pflag && setfile(curr->fts_statp, 0)) 462 rval = 1; 463 else if (dne) 464 (void)chmod(to.p_path, 465 curr->fts_statp->st_mode); 466 467 /* 468 * Since this is the second pass, we already 469 * noted (and acted on) the existence of the 470 * directory. 471 */ 472 dne = 0; 473 } 474 else 475 { 476 warnx("directory %s encountered when not expected.", 477 curr->fts_path); 478 rval = 1; 479 break; 480 } 481 482 break; 483 case S_IFBLK: 484 case S_IFCHR: 485 if (Rflag) { 486 if (copy_special(curr->fts_statp, !dne)) 487 rval = 1; 488 } else 489 if (copy_file(curr, dne)) 490 rval = 1; 491 break; 492 case S_IFIFO: 493 if (Rflag) { 494 if (copy_fifo(curr->fts_statp, !dne)) 495 rval = 1; 496 } else 497 if (copy_file(curr, dne)) 498 rval = 1; 499 break; 500 default: 501 if (copy_file(curr, dne)) 502 rval = 1; 503 break; 504 } 505 if (vflag && !rval) 506 (void)printf("%s -> %s\n", curr->fts_path, to.p_path); 507 } 508 if (errno) { 509 err(EXIT_FAILURE, "fts_read"); 510 /* NOTREACHED */ 511 } 512 (void)fts_close(ftsp); 513 return (rval); 514 } 515 516 /* 517 * mastercmp -- 518 * The comparison function for the copy order. The order is to copy 519 * non-directory files before directory files. The reason for this 520 * is because files tend to be in the same cylinder group as their 521 * parent directory, whereas directories tend not to be. Copying the 522 * files first reduces seeking. 523 */ 524 int 525 mastercmp(const FTSENT **a, const FTSENT **b) 526 { 527 int a_info, b_info; 528 529 a_info = (*a)->fts_info; 530 if (a_info == FTS_ERR || a_info == FTS_NS || a_info == FTS_DNR) 531 return (0); 532 b_info = (*b)->fts_info; 533 if (b_info == FTS_ERR || b_info == FTS_NS || b_info == FTS_DNR) 534 return (0); 535 if (a_info == FTS_D) 536 return (-1); 537 if (b_info == FTS_D) 538 return (1); 539 return (0); 540 } 541