1 /* $NetBSD: cp.c,v 1.54 2010/12/21 20:56:01 christos 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 1.54 2010/12/21 20:56:01 christos 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, 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, "HLNPRfaiprv")) != -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 'p': 144 pflag = 1; 145 break; 146 case 'r': 147 rflag = 1; 148 break; 149 case 'v': 150 vflag = 1; 151 break; 152 case '?': 153 default: 154 usage(); 155 /* NOTREACHED */ 156 } 157 argc -= optind; 158 argv += optind; 159 160 if (argc < 2) 161 usage(); 162 163 fts_options = FTS_NOCHDIR | FTS_PHYSICAL; 164 if (rflag) { 165 if (Rflag) { 166 errx(EXIT_FAILURE, 167 "the -R and -r options may not be specified together."); 168 /* NOTREACHED */ 169 } 170 if (Hflag || Lflag || Pflag) { 171 errx(EXIT_FAILURE, 172 "the -H, -L, and -P options may not be specified with the -r option."); 173 /* NOTREACHED */ 174 } 175 fts_options &= ~FTS_PHYSICAL; 176 fts_options |= FTS_LOGICAL; 177 } 178 179 if (Rflag) { 180 if (Hflag) 181 fts_options |= FTS_COMFOLLOW; 182 if (Lflag) { 183 fts_options &= ~FTS_PHYSICAL; 184 fts_options |= FTS_LOGICAL; 185 } 186 } else if (!Pflag) { 187 fts_options &= ~FTS_PHYSICAL; 188 fts_options |= FTS_LOGICAL | FTS_COMFOLLOW; 189 } 190 191 myuid = getuid(); 192 193 /* Copy the umask for explicit mode setting. */ 194 myumask = umask(0); 195 (void)umask(myumask); 196 197 /* Save the target base in "to". */ 198 target = argv[--argc]; 199 if (strlcpy(to.p_path, target, sizeof(to.p_path)) >= sizeof(to.p_path)) 200 errx(EXIT_FAILURE, "%s: name too long", target); 201 to.p_end = to.p_path + strlen(to.p_path); 202 have_trailing_slash = (to.p_end[-1] == '/'); 203 if (have_trailing_slash) 204 STRIP_TRAILING_SLASH(to); 205 to.target_end = to.p_end; 206 207 /* Set end of argument list for fts(3). */ 208 argv[argc] = NULL; 209 210 /* 211 * Cp has two distinct cases: 212 * 213 * cp [-R] source target 214 * cp [-R] source1 ... sourceN directory 215 * 216 * In both cases, source can be either a file or a directory. 217 * 218 * In (1), the target becomes a copy of the source. That is, if the 219 * source is a file, the target will be a file, and likewise for 220 * directories. 221 * 222 * In (2), the real target is not directory, but "directory/source". 223 */ 224 if (Pflag) 225 r = lstat(to.p_path, &to_stat); 226 else 227 r = stat(to.p_path, &to_stat); 228 if (r == -1 && errno != ENOENT) { 229 err(EXIT_FAILURE, "%s", to.p_path); 230 /* NOTREACHED */ 231 } 232 if (r == -1 || !S_ISDIR(to_stat.st_mode)) { 233 /* 234 * Case (1). Target is not a directory. 235 */ 236 if (argc > 1) 237 usage(); 238 /* 239 * Need to detect the case: 240 * cp -R dir foo 241 * Where dir is a directory and foo does not exist, where 242 * we want pathname concatenations turned on but not for 243 * the initial mkdir(). 244 */ 245 if (r == -1) { 246 if (rflag || (Rflag && (Lflag || Hflag))) 247 r = stat(*argv, &tmp_stat); 248 else 249 r = lstat(*argv, &tmp_stat); 250 if (r == -1) { 251 err(EXIT_FAILURE, "%s", *argv); 252 /* NOTREACHED */ 253 } 254 255 if (S_ISDIR(tmp_stat.st_mode) && (Rflag || rflag)) 256 type = DIR_TO_DNE; 257 else 258 type = FILE_TO_FILE; 259 } else 260 type = FILE_TO_FILE; 261 262 if (have_trailing_slash && type == FILE_TO_FILE) { 263 if (r == -1) 264 errx(1, "directory %s does not exist", 265 to.p_path); 266 else 267 errx(1, "%s is not a directory", to.p_path); 268 } 269 } else { 270 /* 271 * Case (2). Target is a directory. 272 */ 273 type = FILE_TO_DIR; 274 } 275 276 /* 277 * make "cp -rp src/ dst" behave like "cp -rp src dst" not 278 * like "cp -rp src/. dst" 279 */ 280 for (src = argv; *src; src++) { 281 size_t len = strlen(*src); 282 while (len-- > 1 && (*src)[len] == '/') 283 (*src)[len] = '\0'; 284 } 285 286 exit(copy(argv, type, fts_options)); 287 /* NOTREACHED */ 288 } 289 290 static int dnestack[MAXPATHLEN]; /* unlikely we'll have more nested dirs */ 291 static ssize_t dnesp; 292 static void 293 pushdne(int dne) 294 { 295 296 dnestack[dnesp++] = dne; 297 assert(dnesp < MAXPATHLEN); 298 } 299 300 static int 301 popdne(void) 302 { 303 int rv; 304 305 rv = dnestack[--dnesp]; 306 assert(dnesp >= 0); 307 return rv; 308 } 309 310 int 311 copy(char *argv[], enum op type, int fts_options) 312 { 313 struct stat to_stat; 314 FTS *ftsp; 315 FTSENT *curr; 316 int base, dne, sval; 317 int this_failed, any_failed; 318 size_t nlen; 319 char *p, *target_mid; 320 321 base = 0; /* XXX gcc -Wuninitialized (see comment below) */ 322 323 if ((ftsp = fts_open(argv, fts_options, NULL)) == NULL) 324 err(EXIT_FAILURE, "%s", argv[0]); 325 /* NOTREACHED */ 326 for (any_failed = 0; (curr = fts_read(ftsp)) != NULL;) { 327 this_failed = 0; 328 switch (curr->fts_info) { 329 case FTS_NS: 330 case FTS_DNR: 331 case FTS_ERR: 332 warnx("%s: %s", curr->fts_path, 333 strerror(curr->fts_errno)); 334 this_failed = any_failed = 1; 335 continue; 336 case FTS_DC: /* Warn, continue. */ 337 warnx("%s: directory causes a cycle", curr->fts_path); 338 this_failed = any_failed = 1; 339 continue; 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 if ((curr->fts_namelen + 348 to.target_end - to.p_path + 1) > MAXPATHLEN) { 349 warnx("%s/%s: name too long (not copied)", 350 to.p_path, curr->fts_name); 351 this_failed = any_failed = 1; 352 continue; 353 } 354 355 /* 356 * Need to remember the roots of traversals to create 357 * correct pathnames. If there's a directory being 358 * copied to a non-existent directory, e.g. 359 * cp -R a/dir noexist 360 * the resulting path name should be noexist/foo, not 361 * noexist/dir/foo (where foo is a file in dir), which 362 * is the case where the target exists. 363 * 364 * Also, check for "..". This is for correct path 365 * concatentation for paths ending in "..", e.g. 366 * cp -R .. /tmp 367 * Paths ending in ".." are changed to ".". This is 368 * tricky, but seems the easiest way to fix the problem. 369 * 370 * XXX 371 * Since the first level MUST be FTS_ROOTLEVEL, base 372 * is always initialized. 373 */ 374 if (curr->fts_level == FTS_ROOTLEVEL) { 375 if (type != DIR_TO_DNE) { 376 p = strrchr(curr->fts_path, '/'); 377 base = (p == NULL) ? 0 : 378 (int)(p - curr->fts_path + 1); 379 380 if (!strcmp(&curr->fts_path[base], 381 "..")) 382 base += 1; 383 } else 384 base = curr->fts_pathlen; 385 } 386 387 p = &curr->fts_path[base]; 388 nlen = curr->fts_pathlen - base; 389 target_mid = to.target_end; 390 if (*p != '/' && target_mid[-1] != '/') 391 *target_mid++ = '/'; 392 *target_mid = 0; 393 394 if (target_mid - to.p_path + nlen >= PATH_MAX) { 395 warnx("%s%s: name too long (not copied)", 396 to.p_path, p); 397 this_failed = any_failed = 1; 398 continue; 399 } 400 (void)strncat(target_mid, p, nlen); 401 to.p_end = target_mid + nlen; 402 *to.p_end = 0; 403 STRIP_TRAILING_SLASH(to); 404 } 405 406 sval = Pflag ? lstat(to.p_path, &to_stat) : stat(to.p_path, &to_stat); 407 /* Not an error but need to remember it happened */ 408 if (sval == -1) 409 dne = 1; 410 else { 411 if (to_stat.st_dev == curr->fts_statp->st_dev && 412 to_stat.st_ino == curr->fts_statp->st_ino) { 413 warnx("%s and %s are identical (not copied).", 414 to.p_path, curr->fts_path); 415 this_failed = any_failed = 1; 416 if (S_ISDIR(curr->fts_statp->st_mode)) 417 (void)fts_set(ftsp, curr, FTS_SKIP); 418 continue; 419 } 420 if (!S_ISDIR(curr->fts_statp->st_mode) && 421 S_ISDIR(to_stat.st_mode)) { 422 warnx("cannot overwrite directory %s with non-directory %s", 423 to.p_path, curr->fts_path); 424 this_failed = any_failed = 1; 425 continue; 426 } 427 dne = 0; 428 } 429 430 switch (curr->fts_statp->st_mode & S_IFMT) { 431 case S_IFLNK: 432 /* Catch special case of a non dangling symlink */ 433 if((fts_options & FTS_LOGICAL) || 434 ((fts_options & FTS_COMFOLLOW) && curr->fts_level == 0)) { 435 if (copy_file(curr, dne)) 436 this_failed = any_failed = 1; 437 } else { 438 if (copy_link(curr, !dne)) 439 this_failed = any_failed = 1; 440 } 441 break; 442 case S_IFDIR: 443 if (!Rflag && !rflag) { 444 if (curr->fts_info == FTS_D) 445 warnx("%s is a directory (not copied).", 446 curr->fts_path); 447 (void)fts_set(ftsp, curr, FTS_SKIP); 448 this_failed = any_failed = 1; 449 break; 450 } 451 452 /* 453 * Directories get noticed twice: 454 * In the first pass, create it if needed. 455 * In the second pass, after the children have been copied, set the permissions. 456 */ 457 if (curr->fts_info == FTS_D) /* First pass */ 458 { 459 /* 460 * If the directory doesn't exist, create the new 461 * one with the from file mode plus owner RWX bits, 462 * modified by the umask. Trade-off between being 463 * able to write the directory (if from directory is 464 * 555) and not causing a permissions race. If the 465 * umask blocks owner writes, we fail.. 466 */ 467 pushdne(dne); 468 if (dne) { 469 if (mkdir(to.p_path, 470 curr->fts_statp->st_mode | S_IRWXU) < 0) 471 err(EXIT_FAILURE, "%s", 472 to.p_path); 473 /* NOTREACHED */ 474 } else if (!S_ISDIR(to_stat.st_mode)) { 475 errno = ENOTDIR; 476 err(EXIT_FAILURE, "%s", 477 to.p_path); 478 /* NOTREACHED */ 479 } 480 } 481 else if (curr->fts_info == FTS_DP) /* Second pass */ 482 { 483 /* 484 * If not -p and directory didn't exist, set it to be 485 * the same as the from directory, umodified by the 486 * umask; arguably wrong, but it's been that way 487 * forever. 488 */ 489 if (pflag && setfile(curr->fts_statp, 0)) 490 this_failed = any_failed = 1; 491 else if ((dne = popdne())) 492 (void)chmod(to.p_path, 493 curr->fts_statp->st_mode); 494 } 495 else 496 { 497 warnx("directory %s encountered when not expected.", 498 curr->fts_path); 499 this_failed = any_failed = 1; 500 break; 501 } 502 503 break; 504 case S_IFBLK: 505 case S_IFCHR: 506 if (Rflag) { 507 if (copy_special(curr->fts_statp, !dne)) 508 this_failed = any_failed = 1; 509 } else 510 if (copy_file(curr, dne)) 511 this_failed = any_failed = 1; 512 break; 513 case S_IFIFO: 514 if (Rflag) { 515 if (copy_fifo(curr->fts_statp, !dne)) 516 this_failed = any_failed = 1; 517 } else 518 if (copy_file(curr, dne)) 519 this_failed = any_failed = 1; 520 break; 521 default: 522 if (copy_file(curr, dne)) 523 this_failed = any_failed = 1; 524 break; 525 } 526 if (vflag && !this_failed) 527 (void)printf("%s -> %s\n", curr->fts_path, to.p_path); 528 } 529 if (errno) { 530 err(EXIT_FAILURE, "fts_read"); 531 /* NOTREACHED */ 532 } 533 (void)fts_close(ftsp); 534 return (any_failed); 535 } 536