1 /* $NetBSD: cp.c,v 1.57 2011/08/18 08:11:58 manu 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 1.57 2011/08/18 08:11:58 manu 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 <assert.h> 69 #include <err.h> 70 #include <errno.h> 71 #include <fts.h> 72 #include <locale.h> 73 #include <stdlib.h> 74 #include <stdio.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 empty[] = ""; 86 PATH_T to = { .p_end = to.p_path, .target_end = empty }; 87 88 uid_t myuid; 89 int Hflag, Lflag, Rflag, Pflag, fflag, iflag, lflag, pflag, rflag, vflag, Nflag; 90 mode_t myumask; 91 92 enum op { FILE_TO_FILE, FILE_TO_DIR, DIR_TO_DNE }; 93 94 int main(int, char *[]); 95 int copy(char *[], enum op, int); 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, "HLNPRfailprv")) != -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 'a': 130 Pflag = 1; 131 pflag = 1; 132 Rflag = 1; 133 Hflag = Lflag = 0; 134 break; 135 case 'f': 136 fflag = 1; 137 iflag = 0; 138 break; 139 case 'i': 140 iflag = isatty(fileno(stdin)); 141 fflag = 0; 142 break; 143 case 'l': 144 lflag = 1; 145 break; 146 case 'p': 147 pflag = 1; 148 break; 149 case 'r': 150 rflag = 1; 151 break; 152 case 'v': 153 vflag = 1; 154 break; 155 case '?': 156 default: 157 usage(); 158 /* NOTREACHED */ 159 } 160 argc -= optind; 161 argv += optind; 162 163 if (argc < 2) 164 usage(); 165 166 fts_options = FTS_NOCHDIR | FTS_PHYSICAL; 167 if (rflag) { 168 if (Rflag) { 169 errx(EXIT_FAILURE, 170 "the -R and -r options may not be specified together."); 171 /* NOTREACHED */ 172 } 173 if (Hflag || Lflag || Pflag) { 174 errx(EXIT_FAILURE, 175 "the -H, -L, and -P options may not be specified with the -r option."); 176 /* NOTREACHED */ 177 } 178 fts_options &= ~FTS_PHYSICAL; 179 fts_options |= FTS_LOGICAL; 180 } 181 182 if (Rflag) { 183 if (Hflag) 184 fts_options |= FTS_COMFOLLOW; 185 if (Lflag) { 186 fts_options &= ~FTS_PHYSICAL; 187 fts_options |= FTS_LOGICAL; 188 } 189 } else if (!Pflag) { 190 fts_options &= ~FTS_PHYSICAL; 191 fts_options |= FTS_LOGICAL | FTS_COMFOLLOW; 192 } 193 194 myuid = getuid(); 195 196 /* Copy the umask for explicit mode setting. */ 197 myumask = umask(0); 198 (void)umask(myumask); 199 200 /* Save the target base in "to". */ 201 target = argv[--argc]; 202 if (strlcpy(to.p_path, target, sizeof(to.p_path)) >= sizeof(to.p_path)) 203 errx(EXIT_FAILURE, "%s: name too long", target); 204 to.p_end = to.p_path + strlen(to.p_path); 205 have_trailing_slash = (to.p_end[-1] == '/'); 206 if (have_trailing_slash) 207 STRIP_TRAILING_SLASH(to); 208 to.target_end = to.p_end; 209 210 /* Set end of argument list for fts(3). */ 211 argv[argc] = NULL; 212 213 /* 214 * Cp has two distinct cases: 215 * 216 * cp [-R] source target 217 * cp [-R] source1 ... sourceN directory 218 * 219 * In both cases, source can be either a file or a directory. 220 * 221 * In (1), the target becomes a copy of the source. That is, if the 222 * source is a file, the target will be a file, and likewise for 223 * directories. 224 * 225 * In (2), the real target is not directory, but "directory/source". 226 */ 227 if (Pflag) 228 r = lstat(to.p_path, &to_stat); 229 else 230 r = stat(to.p_path, &to_stat); 231 if (r == -1 && errno != ENOENT) { 232 err(EXIT_FAILURE, "%s", to.p_path); 233 /* NOTREACHED */ 234 } 235 if (r == -1 || !S_ISDIR(to_stat.st_mode)) { 236 /* 237 * Case (1). Target is not a directory. 238 */ 239 if (argc > 1) 240 usage(); 241 /* 242 * Need to detect the case: 243 * cp -R dir foo 244 * Where dir is a directory and foo does not exist, where 245 * we want pathname concatenations turned on but not for 246 * the initial mkdir(). 247 */ 248 if (r == -1) { 249 if (rflag || (Rflag && (Lflag || Hflag))) 250 r = stat(*argv, &tmp_stat); 251 else 252 r = lstat(*argv, &tmp_stat); 253 if (r == -1) { 254 err(EXIT_FAILURE, "%s", *argv); 255 /* NOTREACHED */ 256 } 257 258 if (S_ISDIR(tmp_stat.st_mode) && (Rflag || rflag)) 259 type = DIR_TO_DNE; 260 else 261 type = FILE_TO_FILE; 262 } else 263 type = FILE_TO_FILE; 264 265 if (have_trailing_slash && type == FILE_TO_FILE) { 266 if (r == -1) 267 errx(1, "directory %s does not exist", 268 to.p_path); 269 else 270 errx(1, "%s is not a directory", to.p_path); 271 } 272 } else { 273 /* 274 * Case (2). Target is a directory. 275 */ 276 type = FILE_TO_DIR; 277 } 278 279 /* 280 * make "cp -rp src/ dst" behave like "cp -rp src dst" not 281 * like "cp -rp src/. dst" 282 */ 283 for (src = argv; *src; src++) { 284 size_t len = strlen(*src); 285 while (len-- > 1 && (*src)[len] == '/') 286 (*src)[len] = '\0'; 287 } 288 289 exit(copy(argv, type, fts_options)); 290 /* NOTREACHED */ 291 } 292 293 static int dnestack[MAXPATHLEN]; /* unlikely we'll have more nested dirs */ 294 static ssize_t dnesp; 295 static void 296 pushdne(int dne) 297 { 298 299 dnestack[dnesp++] = dne; 300 assert(dnesp < MAXPATHLEN); 301 } 302 303 static int 304 popdne(void) 305 { 306 int rv; 307 308 rv = dnestack[--dnesp]; 309 assert(dnesp >= 0); 310 return rv; 311 } 312 313 int 314 copy(char *argv[], enum op type, int fts_options) 315 { 316 struct stat to_stat; 317 FTS *ftsp; 318 FTSENT *curr; 319 int base, dne, sval; 320 int this_failed, any_failed; 321 size_t nlen; 322 char *p, *target_mid; 323 324 base = 0; /* XXX gcc -Wuninitialized (see comment below) */ 325 326 if ((ftsp = fts_open(argv, fts_options, NULL)) == NULL) 327 err(EXIT_FAILURE, "%s", argv[0]); 328 /* NOTREACHED */ 329 for (any_failed = 0; (curr = fts_read(ftsp)) != NULL;) { 330 this_failed = 0; 331 switch (curr->fts_info) { 332 case FTS_NS: 333 case FTS_DNR: 334 case FTS_ERR: 335 warnx("%s: %s", curr->fts_path, 336 strerror(curr->fts_errno)); 337 this_failed = any_failed = 1; 338 continue; 339 case FTS_DC: /* Warn, continue. */ 340 warnx("%s: directory causes a cycle", curr->fts_path); 341 this_failed = any_failed = 1; 342 continue; 343 } 344 345 /* 346 * If we are in case (2) or (3) above, we need to append the 347 * source name to the target name. 348 */ 349 if (type != FILE_TO_FILE) { 350 if ((curr->fts_namelen + 351 to.target_end - to.p_path + 1) > MAXPATHLEN) { 352 warnx("%s/%s: name too long (not copied)", 353 to.p_path, curr->fts_name); 354 this_failed = any_failed = 1; 355 continue; 356 } 357 358 /* 359 * Need to remember the roots of traversals to create 360 * correct pathnames. If there's a directory being 361 * copied to a non-existent directory, e.g. 362 * cp -R a/dir noexist 363 * the resulting path name should be noexist/foo, not 364 * noexist/dir/foo (where foo is a file in dir), which 365 * is the case where the target exists. 366 * 367 * Also, check for "..". This is for correct path 368 * concatentation for paths ending in "..", e.g. 369 * cp -R .. /tmp 370 * Paths ending in ".." are changed to ".". This is 371 * tricky, but seems the easiest way to fix the problem. 372 * 373 * XXX 374 * Since the first level MUST be FTS_ROOTLEVEL, base 375 * is always initialized. 376 */ 377 if (curr->fts_level == FTS_ROOTLEVEL) { 378 if (type != DIR_TO_DNE) { 379 p = strrchr(curr->fts_path, '/'); 380 base = (p == NULL) ? 0 : 381 (int)(p - curr->fts_path + 1); 382 383 if (!strcmp(&curr->fts_path[base], 384 "..")) 385 base += 1; 386 } else 387 base = curr->fts_pathlen; 388 } 389 390 p = &curr->fts_path[base]; 391 nlen = curr->fts_pathlen - base; 392 target_mid = to.target_end; 393 if (*p != '/' && target_mid[-1] != '/') 394 *target_mid++ = '/'; 395 *target_mid = 0; 396 397 if (target_mid - to.p_path + nlen >= PATH_MAX) { 398 warnx("%s%s: name too long (not copied)", 399 to.p_path, p); 400 this_failed = any_failed = 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 sval = Pflag ? lstat(to.p_path, &to_stat) : stat(to.p_path, &to_stat); 410 /* Not an error but need to remember it happened */ 411 if (sval == -1) 412 dne = 1; 413 else { 414 if (to_stat.st_dev == curr->fts_statp->st_dev && 415 to_stat.st_ino == curr->fts_statp->st_ino) { 416 warnx("%s and %s are identical (not copied).", 417 to.p_path, curr->fts_path); 418 this_failed = any_failed = 1; 419 if (S_ISDIR(curr->fts_statp->st_mode)) 420 (void)fts_set(ftsp, curr, FTS_SKIP); 421 continue; 422 } 423 if (!S_ISDIR(curr->fts_statp->st_mode) && 424 S_ISDIR(to_stat.st_mode)) { 425 warnx("cannot overwrite directory %s with non-directory %s", 426 to.p_path, curr->fts_path); 427 this_failed = any_failed = 1; 428 continue; 429 } 430 dne = 0; 431 } 432 433 switch (curr->fts_statp->st_mode & S_IFMT) { 434 case S_IFLNK: 435 /* Catch special case of a non dangling symlink */ 436 if((fts_options & FTS_LOGICAL) || 437 ((fts_options & FTS_COMFOLLOW) && curr->fts_level == 0)) { 438 if (copy_file(curr, dne)) 439 this_failed = any_failed = 1; 440 } else { 441 if (copy_link(curr, !dne)) 442 this_failed = any_failed = 1; 443 } 444 break; 445 case S_IFDIR: 446 if (!Rflag && !rflag) { 447 if (curr->fts_info == FTS_D) 448 warnx("%s is a directory (not copied).", 449 curr->fts_path); 450 (void)fts_set(ftsp, curr, FTS_SKIP); 451 this_failed = any_failed = 1; 452 break; 453 } 454 455 /* 456 * Directories get noticed twice: 457 * In the first pass, create it if needed. 458 * In the second pass, after the children have been copied, set the permissions. 459 */ 460 if (curr->fts_info == FTS_D) /* First pass */ 461 { 462 /* 463 * If the directory doesn't exist, create the new 464 * one with the from file mode plus owner RWX bits, 465 * modified by the umask. Trade-off between being 466 * able to write the directory (if from directory is 467 * 555) and not causing a permissions race. If the 468 * umask blocks owner writes, we fail.. 469 */ 470 pushdne(dne); 471 if (dne) { 472 if (mkdir(to.p_path, 473 curr->fts_statp->st_mode | S_IRWXU) < 0) 474 err(EXIT_FAILURE, "%s", 475 to.p_path); 476 /* NOTREACHED */ 477 } else if (!S_ISDIR(to_stat.st_mode)) { 478 errno = ENOTDIR; 479 err(EXIT_FAILURE, "%s", 480 to.p_path); 481 /* NOTREACHED */ 482 } 483 } 484 else if (curr->fts_info == FTS_DP) /* Second pass */ 485 { 486 /* 487 * If not -p and directory didn't exist, set it to be 488 * the same as the from directory, umodified by the 489 * umask; arguably wrong, but it's been that way 490 * forever. 491 */ 492 if (pflag && setfile(curr->fts_statp, 0)) 493 this_failed = any_failed = 1; 494 else if ((dne = popdne())) 495 (void)chmod(to.p_path, 496 curr->fts_statp->st_mode); 497 } 498 else 499 { 500 warnx("directory %s encountered when not expected.", 501 curr->fts_path); 502 this_failed = any_failed = 1; 503 break; 504 } 505 506 break; 507 case S_IFBLK: 508 case S_IFCHR: 509 if (Rflag) { 510 if (copy_special(curr->fts_statp, !dne)) 511 this_failed = any_failed = 1; 512 } else 513 if (copy_file(curr, dne)) 514 this_failed = any_failed = 1; 515 break; 516 case S_IFIFO: 517 if (Rflag) { 518 if (copy_fifo(curr->fts_statp, !dne)) 519 this_failed = any_failed = 1; 520 } else 521 if (copy_file(curr, dne)) 522 this_failed = any_failed = 1; 523 break; 524 default: 525 if (copy_file(curr, dne)) 526 this_failed = any_failed = 1; 527 break; 528 } 529 if (vflag && !this_failed) 530 (void)printf("%s -> %s\n", curr->fts_path, to.p_path); 531 } 532 if (errno) { 533 err(EXIT_FAILURE, "fts_read"); 534 /* NOTREACHED */ 535 } 536 (void)fts_close(ftsp); 537 return (any_failed); 538 } 539