1 /* $NetBSD: cp.c,v 1.53 2009/10/08 20:36:41 pooka 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 1.53 2009/10/08 20:36:41 pooka 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, "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 static int dnestack[MAXPATHLEN]; /* unlikely we'll have more nested dirs */ 285 static ssize_t dnesp; 286 static void 287 pushdne(int dne) 288 { 289 290 dnestack[dnesp++] = dne; 291 assert(dnesp < MAXPATHLEN); 292 } 293 294 static int 295 popdne(void) 296 { 297 int rv; 298 299 rv = dnestack[--dnesp]; 300 assert(dnesp >= 0); 301 return rv; 302 } 303 304 int 305 copy(char *argv[], enum op type, int fts_options) 306 { 307 struct stat to_stat; 308 FTS *ftsp; 309 FTSENT *curr; 310 int base, dne, sval; 311 int this_failed, any_failed; 312 size_t nlen; 313 char *p, *target_mid; 314 315 base = 0; /* XXX gcc -Wuninitialized (see comment below) */ 316 317 if ((ftsp = fts_open(argv, fts_options, NULL)) == NULL) 318 err(EXIT_FAILURE, "%s", argv[0]); 319 /* NOTREACHED */ 320 for (any_failed = 0; (curr = fts_read(ftsp)) != NULL;) { 321 this_failed = 0; 322 switch (curr->fts_info) { 323 case FTS_NS: 324 case FTS_DNR: 325 case FTS_ERR: 326 warnx("%s: %s", curr->fts_path, 327 strerror(curr->fts_errno)); 328 this_failed = any_failed = 1; 329 continue; 330 case FTS_DC: /* Warn, continue. */ 331 warnx("%s: directory causes a cycle", curr->fts_path); 332 this_failed = any_failed = 1; 333 continue; 334 } 335 336 /* 337 * If we are in case (2) or (3) above, we need to append the 338 * source name to the target name. 339 */ 340 if (type != FILE_TO_FILE) { 341 if ((curr->fts_namelen + 342 to.target_end - to.p_path + 1) > MAXPATHLEN) { 343 warnx("%s/%s: name too long (not copied)", 344 to.p_path, curr->fts_name); 345 this_failed = any_failed = 1; 346 continue; 347 } 348 349 /* 350 * Need to remember the roots of traversals to create 351 * correct pathnames. If there's a directory being 352 * copied to a non-existent directory, e.g. 353 * cp -R a/dir noexist 354 * the resulting path name should be noexist/foo, not 355 * noexist/dir/foo (where foo is a file in dir), which 356 * is the case where the target exists. 357 * 358 * Also, check for "..". This is for correct path 359 * concatentation for paths ending in "..", e.g. 360 * cp -R .. /tmp 361 * Paths ending in ".." are changed to ".". This is 362 * tricky, but seems the easiest way to fix the problem. 363 * 364 * XXX 365 * Since the first level MUST be FTS_ROOTLEVEL, base 366 * is always initialized. 367 */ 368 if (curr->fts_level == FTS_ROOTLEVEL) { 369 if (type != DIR_TO_DNE) { 370 p = strrchr(curr->fts_path, '/'); 371 base = (p == NULL) ? 0 : 372 (int)(p - curr->fts_path + 1); 373 374 if (!strcmp(&curr->fts_path[base], 375 "..")) 376 base += 1; 377 } else 378 base = curr->fts_pathlen; 379 } 380 381 p = &curr->fts_path[base]; 382 nlen = curr->fts_pathlen - base; 383 target_mid = to.target_end; 384 if (*p != '/' && target_mid[-1] != '/') 385 *target_mid++ = '/'; 386 *target_mid = 0; 387 388 if (target_mid - to.p_path + nlen >= PATH_MAX) { 389 warnx("%s%s: name too long (not copied)", 390 to.p_path, p); 391 this_failed = any_failed = 1; 392 continue; 393 } 394 (void)strncat(target_mid, p, nlen); 395 to.p_end = target_mid + nlen; 396 *to.p_end = 0; 397 STRIP_TRAILING_SLASH(to); 398 } 399 400 sval = Pflag ? lstat(to.p_path, &to_stat) : stat(to.p_path, &to_stat); 401 /* Not an error but need to remember it happened */ 402 if (sval == -1) 403 dne = 1; 404 else { 405 if (to_stat.st_dev == curr->fts_statp->st_dev && 406 to_stat.st_ino == curr->fts_statp->st_ino) { 407 warnx("%s and %s are identical (not copied).", 408 to.p_path, curr->fts_path); 409 this_failed = any_failed = 1; 410 if (S_ISDIR(curr->fts_statp->st_mode)) 411 (void)fts_set(ftsp, curr, FTS_SKIP); 412 continue; 413 } 414 if (!S_ISDIR(curr->fts_statp->st_mode) && 415 S_ISDIR(to_stat.st_mode)) { 416 warnx("cannot overwrite directory %s with non-directory %s", 417 to.p_path, curr->fts_path); 418 this_failed = any_failed = 1; 419 continue; 420 } 421 dne = 0; 422 } 423 424 switch (curr->fts_statp->st_mode & S_IFMT) { 425 case S_IFLNK: 426 /* Catch special case of a non dangling symlink */ 427 if((fts_options & FTS_LOGICAL) || 428 ((fts_options & FTS_COMFOLLOW) && curr->fts_level == 0)) { 429 if (copy_file(curr, dne)) 430 this_failed = any_failed = 1; 431 } else { 432 if (copy_link(curr, !dne)) 433 this_failed = any_failed = 1; 434 } 435 break; 436 case S_IFDIR: 437 if (!Rflag && !rflag) { 438 if (curr->fts_info == FTS_D) 439 warnx("%s is a directory (not copied).", 440 curr->fts_path); 441 (void)fts_set(ftsp, curr, FTS_SKIP); 442 this_failed = any_failed = 1; 443 break; 444 } 445 446 /* 447 * Directories get noticed twice: 448 * In the first pass, create it if needed. 449 * In the second pass, after the children have been copied, set the permissions. 450 */ 451 if (curr->fts_info == FTS_D) /* First pass */ 452 { 453 /* 454 * If the directory doesn't exist, create the new 455 * one with the from file mode plus owner RWX bits, 456 * modified by the umask. Trade-off between being 457 * able to write the directory (if from directory is 458 * 555) and not causing a permissions race. If the 459 * umask blocks owner writes, we fail.. 460 */ 461 pushdne(dne); 462 if (dne) { 463 if (mkdir(to.p_path, 464 curr->fts_statp->st_mode | S_IRWXU) < 0) 465 err(EXIT_FAILURE, "%s", 466 to.p_path); 467 /* NOTREACHED */ 468 } else if (!S_ISDIR(to_stat.st_mode)) { 469 errno = ENOTDIR; 470 err(EXIT_FAILURE, "%s", 471 to.p_path); 472 /* NOTREACHED */ 473 } 474 } 475 else if (curr->fts_info == FTS_DP) /* Second pass */ 476 { 477 /* 478 * If not -p and directory didn't exist, set it to be 479 * the same as the from directory, umodified by the 480 * umask; arguably wrong, but it's been that way 481 * forever. 482 */ 483 if (pflag && setfile(curr->fts_statp, 0)) 484 this_failed = any_failed = 1; 485 else if ((dne = popdne())) 486 (void)chmod(to.p_path, 487 curr->fts_statp->st_mode); 488 } 489 else 490 { 491 warnx("directory %s encountered when not expected.", 492 curr->fts_path); 493 this_failed = any_failed = 1; 494 break; 495 } 496 497 break; 498 case S_IFBLK: 499 case S_IFCHR: 500 if (Rflag) { 501 if (copy_special(curr->fts_statp, !dne)) 502 this_failed = any_failed = 1; 503 } else 504 if (copy_file(curr, dne)) 505 this_failed = any_failed = 1; 506 break; 507 case S_IFIFO: 508 if (Rflag) { 509 if (copy_fifo(curr->fts_statp, !dne)) 510 this_failed = any_failed = 1; 511 } else 512 if (copy_file(curr, dne)) 513 this_failed = any_failed = 1; 514 break; 515 default: 516 if (copy_file(curr, dne)) 517 this_failed = any_failed = 1; 518 break; 519 } 520 if (vflag && !this_failed) 521 (void)printf("%s -> %s\n", curr->fts_path, to.p_path); 522 } 523 if (errno) { 524 err(EXIT_FAILURE, "fts_read"); 525 /* NOTREACHED */ 526 } 527 (void)fts_close(ftsp); 528 return (any_failed); 529 } 530