1 /* $NetBSD: cp.c,v 1.58 2012/01/04 15:58:37 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 1.58 2012/01/04 15:58:37 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 <signal.h> 74 #include <stdlib.h> 75 #include <stdio.h> 76 #include <string.h> 77 #include <unistd.h> 78 79 #include "extern.h" 80 81 #define STRIP_TRAILING_SLASH(p) { \ 82 while ((p).p_end > (p).p_path + 1 && (p).p_end[-1] == '/') \ 83 *--(p).p_end = '\0'; \ 84 } 85 86 static char empty[] = ""; 87 PATH_T to = { .p_end = to.p_path, .target_end = empty }; 88 89 uid_t myuid; 90 int Hflag, Lflag, Rflag, Pflag, fflag, iflag, lflag, pflag, rflag, vflag, Nflag; 91 mode_t myumask; 92 sig_atomic_t pinfo; 93 94 enum op { FILE_TO_FILE, FILE_TO_DIR, DIR_TO_DNE }; 95 96 static int copy(char *[], enum op, int); 97 98 static void 99 progress(int sig __unused) 100 { 101 102 pinfo++; 103 } 104 105 int 106 main(int argc, char *argv[]) 107 { 108 struct stat to_stat, tmp_stat; 109 enum op type; 110 int ch, fts_options, r, have_trailing_slash; 111 char *target, **src; 112 113 setprogname(argv[0]); 114 (void)setlocale(LC_ALL, ""); 115 116 Hflag = Lflag = Pflag = Rflag = 0; 117 while ((ch = getopt(argc, argv, "HLNPRfailprv")) != -1) 118 switch (ch) { 119 case 'H': 120 Hflag = 1; 121 Lflag = Pflag = 0; 122 break; 123 case 'L': 124 Lflag = 1; 125 Hflag = Pflag = 0; 126 break; 127 case 'N': 128 Nflag = 1; 129 break; 130 case 'P': 131 Pflag = 1; 132 Hflag = Lflag = 0; 133 break; 134 case 'R': 135 Rflag = 1; 136 break; 137 case 'a': 138 Pflag = 1; 139 pflag = 1; 140 Rflag = 1; 141 Hflag = Lflag = 0; 142 break; 143 case 'f': 144 fflag = 1; 145 iflag = 0; 146 break; 147 case 'i': 148 iflag = isatty(fileno(stdin)); 149 fflag = 0; 150 break; 151 case 'l': 152 lflag = 1; 153 break; 154 case 'p': 155 pflag = 1; 156 break; 157 case 'r': 158 rflag = 1; 159 break; 160 case 'v': 161 vflag = 1; 162 break; 163 case '?': 164 default: 165 usage(); 166 /* NOTREACHED */ 167 } 168 argc -= optind; 169 argv += optind; 170 171 if (argc < 2) 172 usage(); 173 174 fts_options = FTS_NOCHDIR | FTS_PHYSICAL; 175 if (rflag) { 176 if (Rflag) { 177 errx(EXIT_FAILURE, 178 "the -R and -r options may not be specified together."); 179 /* NOTREACHED */ 180 } 181 if (Hflag || Lflag || Pflag) { 182 errx(EXIT_FAILURE, 183 "the -H, -L, and -P options may not be specified with the -r option."); 184 /* NOTREACHED */ 185 } 186 fts_options &= ~FTS_PHYSICAL; 187 fts_options |= FTS_LOGICAL; 188 } 189 190 if (Rflag) { 191 if (Hflag) 192 fts_options |= FTS_COMFOLLOW; 193 if (Lflag) { 194 fts_options &= ~FTS_PHYSICAL; 195 fts_options |= FTS_LOGICAL; 196 } 197 } else if (!Pflag) { 198 fts_options &= ~FTS_PHYSICAL; 199 fts_options |= FTS_LOGICAL | FTS_COMFOLLOW; 200 } 201 202 myuid = getuid(); 203 204 /* Copy the umask for explicit mode setting. */ 205 myumask = umask(0); 206 (void)umask(myumask); 207 208 /* Save the target base in "to". */ 209 target = argv[--argc]; 210 if (strlcpy(to.p_path, target, sizeof(to.p_path)) >= sizeof(to.p_path)) 211 errx(EXIT_FAILURE, "%s: name too long", target); 212 to.p_end = to.p_path + strlen(to.p_path); 213 have_trailing_slash = (to.p_end[-1] == '/'); 214 if (have_trailing_slash) 215 STRIP_TRAILING_SLASH(to); 216 to.target_end = to.p_end; 217 218 /* Set end of argument list for fts(3). */ 219 argv[argc] = NULL; 220 221 (void)signal(SIGINFO, progress); 222 223 /* 224 * Cp has two distinct cases: 225 * 226 * cp [-R] source target 227 * cp [-R] source1 ... sourceN directory 228 * 229 * In both cases, source can be either a file or a directory. 230 * 231 * In (1), the target becomes a copy of the source. That is, if the 232 * source is a file, the target will be a file, and likewise for 233 * directories. 234 * 235 * In (2), the real target is not directory, but "directory/source". 236 */ 237 if (Pflag) 238 r = lstat(to.p_path, &to_stat); 239 else 240 r = stat(to.p_path, &to_stat); 241 if (r == -1 && errno != ENOENT) { 242 err(EXIT_FAILURE, "%s", to.p_path); 243 /* NOTREACHED */ 244 } 245 if (r == -1 || !S_ISDIR(to_stat.st_mode)) { 246 /* 247 * Case (1). Target is not a directory. 248 */ 249 if (argc > 1) 250 usage(); 251 /* 252 * Need to detect the case: 253 * cp -R dir foo 254 * Where dir is a directory and foo does not exist, where 255 * we want pathname concatenations turned on but not for 256 * the initial mkdir(). 257 */ 258 if (r == -1) { 259 if (rflag || (Rflag && (Lflag || Hflag))) 260 r = stat(*argv, &tmp_stat); 261 else 262 r = lstat(*argv, &tmp_stat); 263 if (r == -1) { 264 err(EXIT_FAILURE, "%s", *argv); 265 /* NOTREACHED */ 266 } 267 268 if (S_ISDIR(tmp_stat.st_mode) && (Rflag || rflag)) 269 type = DIR_TO_DNE; 270 else 271 type = FILE_TO_FILE; 272 } else 273 type = FILE_TO_FILE; 274 275 if (have_trailing_slash && type == FILE_TO_FILE) { 276 if (r == -1) 277 errx(1, "directory %s does not exist", 278 to.p_path); 279 else 280 errx(1, "%s is not a directory", to.p_path); 281 } 282 } else { 283 /* 284 * Case (2). Target is a directory. 285 */ 286 type = FILE_TO_DIR; 287 } 288 289 /* 290 * make "cp -rp src/ dst" behave like "cp -rp src dst" not 291 * like "cp -rp src/. dst" 292 */ 293 for (src = argv; *src; src++) { 294 size_t len = strlen(*src); 295 while (len-- > 1 && (*src)[len] == '/') 296 (*src)[len] = '\0'; 297 } 298 299 exit(copy(argv, type, fts_options)); 300 /* NOTREACHED */ 301 } 302 303 static int dnestack[MAXPATHLEN]; /* unlikely we'll have more nested dirs */ 304 static ssize_t dnesp; 305 static void 306 pushdne(int dne) 307 { 308 309 dnestack[dnesp++] = dne; 310 assert(dnesp < MAXPATHLEN); 311 } 312 313 static int 314 popdne(void) 315 { 316 int rv; 317 318 rv = dnestack[--dnesp]; 319 assert(dnesp >= 0); 320 return rv; 321 } 322 323 static int 324 copy(char *argv[], enum op type, int fts_options) 325 { 326 struct stat to_stat; 327 FTS *ftsp; 328 FTSENT *curr; 329 int base, dne, sval; 330 int this_failed, any_failed; 331 size_t nlen; 332 char *p, *target_mid; 333 334 base = 0; /* XXX gcc -Wuninitialized (see comment below) */ 335 336 if ((ftsp = fts_open(argv, fts_options, NULL)) == NULL) 337 err(EXIT_FAILURE, "%s", argv[0]); 338 /* NOTREACHED */ 339 for (any_failed = 0; (curr = fts_read(ftsp)) != NULL;) { 340 this_failed = 0; 341 switch (curr->fts_info) { 342 case FTS_NS: 343 case FTS_DNR: 344 case FTS_ERR: 345 warnx("%s: %s", curr->fts_path, 346 strerror(curr->fts_errno)); 347 this_failed = any_failed = 1; 348 continue; 349 case FTS_DC: /* Warn, continue. */ 350 warnx("%s: directory causes a cycle", curr->fts_path); 351 this_failed = any_failed = 1; 352 continue; 353 } 354 355 /* 356 * If we are in case (2) or (3) above, we need to append the 357 * source name to the target name. 358 */ 359 if (type != FILE_TO_FILE) { 360 if ((curr->fts_namelen + 361 to.target_end - to.p_path + 1) > MAXPATHLEN) { 362 warnx("%s/%s: name too long (not copied)", 363 to.p_path, curr->fts_name); 364 this_failed = any_failed = 1; 365 continue; 366 } 367 368 /* 369 * Need to remember the roots of traversals to create 370 * correct pathnames. If there's a directory being 371 * copied to a non-existent directory, e.g. 372 * cp -R a/dir noexist 373 * the resulting path name should be noexist/foo, not 374 * noexist/dir/foo (where foo is a file in dir), which 375 * is the case where the target exists. 376 * 377 * Also, check for "..". This is for correct path 378 * concatentation for paths ending in "..", e.g. 379 * cp -R .. /tmp 380 * Paths ending in ".." are changed to ".". This is 381 * tricky, but seems the easiest way to fix the problem. 382 * 383 * XXX 384 * Since the first level MUST be FTS_ROOTLEVEL, base 385 * is always initialized. 386 */ 387 if (curr->fts_level == FTS_ROOTLEVEL) { 388 if (type != DIR_TO_DNE) { 389 p = strrchr(curr->fts_path, '/'); 390 base = (p == NULL) ? 0 : 391 (int)(p - curr->fts_path + 1); 392 393 if (!strcmp(&curr->fts_path[base], 394 "..")) 395 base += 1; 396 } else 397 base = curr->fts_pathlen; 398 } 399 400 p = &curr->fts_path[base]; 401 nlen = curr->fts_pathlen - base; 402 target_mid = to.target_end; 403 if (*p != '/' && target_mid[-1] != '/') 404 *target_mid++ = '/'; 405 *target_mid = 0; 406 407 if (target_mid - to.p_path + nlen >= PATH_MAX) { 408 warnx("%s%s: name too long (not copied)", 409 to.p_path, p); 410 this_failed = any_failed = 1; 411 continue; 412 } 413 (void)strncat(target_mid, p, nlen); 414 to.p_end = target_mid + nlen; 415 *to.p_end = 0; 416 STRIP_TRAILING_SLASH(to); 417 } 418 419 sval = Pflag ? lstat(to.p_path, &to_stat) : stat(to.p_path, &to_stat); 420 /* Not an error but need to remember it happened */ 421 if (sval == -1) 422 dne = 1; 423 else { 424 if (to_stat.st_dev == curr->fts_statp->st_dev && 425 to_stat.st_ino == curr->fts_statp->st_ino) { 426 warnx("%s and %s are identical (not copied).", 427 to.p_path, curr->fts_path); 428 this_failed = any_failed = 1; 429 if (S_ISDIR(curr->fts_statp->st_mode)) 430 (void)fts_set(ftsp, curr, FTS_SKIP); 431 continue; 432 } 433 if (!S_ISDIR(curr->fts_statp->st_mode) && 434 S_ISDIR(to_stat.st_mode)) { 435 warnx("cannot overwrite directory %s with non-directory %s", 436 to.p_path, curr->fts_path); 437 this_failed = any_failed = 1; 438 continue; 439 } 440 dne = 0; 441 } 442 443 switch (curr->fts_statp->st_mode & S_IFMT) { 444 case S_IFLNK: 445 /* Catch special case of a non dangling symlink */ 446 if((fts_options & FTS_LOGICAL) || 447 ((fts_options & FTS_COMFOLLOW) && curr->fts_level == 0)) { 448 if (copy_file(curr, dne)) 449 this_failed = any_failed = 1; 450 } else { 451 if (copy_link(curr, !dne)) 452 this_failed = any_failed = 1; 453 } 454 break; 455 case S_IFDIR: 456 if (!Rflag && !rflag) { 457 if (curr->fts_info == FTS_D) 458 warnx("%s is a directory (not copied).", 459 curr->fts_path); 460 (void)fts_set(ftsp, curr, FTS_SKIP); 461 this_failed = any_failed = 1; 462 break; 463 } 464 465 /* 466 * Directories get noticed twice: 467 * In the first pass, create it if needed. 468 * In the second pass, after the children have been copied, set the permissions. 469 */ 470 if (curr->fts_info == FTS_D) /* First pass */ 471 { 472 /* 473 * If the directory doesn't exist, create the new 474 * one with the from file mode plus owner RWX bits, 475 * modified by the umask. Trade-off between being 476 * able to write the directory (if from directory is 477 * 555) and not causing a permissions race. If the 478 * umask blocks owner writes, we fail.. 479 */ 480 pushdne(dne); 481 if (dne) { 482 if (mkdir(to.p_path, 483 curr->fts_statp->st_mode | S_IRWXU) < 0) 484 err(EXIT_FAILURE, "%s", 485 to.p_path); 486 /* NOTREACHED */ 487 } else if (!S_ISDIR(to_stat.st_mode)) { 488 errno = ENOTDIR; 489 err(EXIT_FAILURE, "%s", 490 to.p_path); 491 /* NOTREACHED */ 492 } 493 } 494 else if (curr->fts_info == FTS_DP) /* Second pass */ 495 { 496 /* 497 * If not -p and directory didn't exist, set it to be 498 * the same as the from directory, umodified by the 499 * umask; arguably wrong, but it's been that way 500 * forever. 501 */ 502 if (pflag && setfile(curr->fts_statp, 0)) 503 this_failed = any_failed = 1; 504 else if ((dne = popdne())) 505 (void)chmod(to.p_path, 506 curr->fts_statp->st_mode); 507 } 508 else 509 { 510 warnx("directory %s encountered when not expected.", 511 curr->fts_path); 512 this_failed = any_failed = 1; 513 break; 514 } 515 516 break; 517 case S_IFBLK: 518 case S_IFCHR: 519 if (Rflag) { 520 if (copy_special(curr->fts_statp, !dne)) 521 this_failed = any_failed = 1; 522 } else 523 if (copy_file(curr, dne)) 524 this_failed = any_failed = 1; 525 break; 526 case S_IFIFO: 527 if (Rflag) { 528 if (copy_fifo(curr->fts_statp, !dne)) 529 this_failed = any_failed = 1; 530 } else 531 if (copy_file(curr, dne)) 532 this_failed = any_failed = 1; 533 break; 534 default: 535 if (copy_file(curr, dne)) 536 this_failed = any_failed = 1; 537 break; 538 } 539 if (vflag && !this_failed) 540 (void)printf("%s -> %s\n", curr->fts_path, to.p_path); 541 } 542 if (errno) { 543 err(EXIT_FAILURE, "fts_read"); 544 /* NOTREACHED */ 545 } 546 (void)fts_close(ftsp); 547 return (any_failed); 548 } 549
