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 cp_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 #ifndef ANDROID 114 setprogname(argv[0]); 115 #endif 116 (void)setlocale(LC_ALL, ""); 117 118 Hflag = Lflag = Pflag = Rflag = 0; 119 while ((ch = getopt(argc, argv, "HLNPRfailprv")) != -1) 120 switch (ch) { 121 case 'H': 122 Hflag = 1; 123 Lflag = Pflag = 0; 124 break; 125 case 'L': 126 Lflag = 1; 127 Hflag = Pflag = 0; 128 break; 129 case 'N': 130 Nflag = 1; 131 break; 132 case 'P': 133 Pflag = 1; 134 Hflag = Lflag = 0; 135 break; 136 case 'R': 137 Rflag = 1; 138 break; 139 case 'a': 140 Pflag = 1; 141 pflag = 1; 142 Rflag = 1; 143 Hflag = Lflag = 0; 144 break; 145 case 'f': 146 fflag = 1; 147 iflag = 0; 148 break; 149 case 'i': 150 iflag = isatty(fileno(stdin)); 151 fflag = 0; 152 break; 153 case 'l': 154 lflag = 1; 155 break; 156 case 'p': 157 pflag = 1; 158 break; 159 case 'r': 160 rflag = 1; 161 break; 162 case 'v': 163 vflag = 1; 164 break; 165 case '?': 166 default: 167 cp_usage(); 168 /* NOTREACHED */ 169 } 170 argc -= optind; 171 argv += optind; 172 173 if (argc < 2) 174 cp_usage(); 175 176 fts_options = FTS_NOCHDIR | FTS_PHYSICAL; 177 if (rflag) { 178 if (Rflag) { 179 errx(EXIT_FAILURE, 180 "the -R and -r options may not be specified together."); 181 /* NOTREACHED */ 182 } 183 if (Hflag || Lflag || Pflag) { 184 errx(EXIT_FAILURE, 185 "the -H, -L, and -P options may not be specified with the -r option."); 186 /* NOTREACHED */ 187 } 188 fts_options &= ~FTS_PHYSICAL; 189 fts_options |= FTS_LOGICAL; 190 } 191 192 if (Rflag) { 193 if (Hflag) 194 fts_options |= FTS_COMFOLLOW; 195 if (Lflag) { 196 fts_options &= ~FTS_PHYSICAL; 197 fts_options |= FTS_LOGICAL; 198 } 199 } else if (!Pflag) { 200 fts_options &= ~FTS_PHYSICAL; 201 fts_options |= FTS_LOGICAL | FTS_COMFOLLOW; 202 } 203 204 myuid = getuid(); 205 206 /* Copy the umask for explicit mode setting. */ 207 myumask = umask(0); 208 (void)umask(myumask); 209 210 /* Save the target base in "to". */ 211 target = argv[--argc]; 212 if (strlcpy(to.p_path, target, sizeof(to.p_path)) >= sizeof(to.p_path)) 213 errx(EXIT_FAILURE, "%s: name too long", target); 214 to.p_end = to.p_path + strlen(to.p_path); 215 have_trailing_slash = (to.p_end[-1] == '/'); 216 if (have_trailing_slash) 217 STRIP_TRAILING_SLASH(to); 218 to.target_end = to.p_end; 219 220 /* Set end of argument list for fts(3). */ 221 argv[argc] = NULL; 222 223 #ifndef ANDROID 224 (void)signal(SIGINFO, progress); 225 #endif 226 227 /* 228 * Cp has two distinct cases: 229 * 230 * cp [-R] source target 231 * cp [-R] source1 ... sourceN directory 232 * 233 * In both cases, source can be either a file or a directory. 234 * 235 * In (1), the target becomes a copy of the source. That is, if the 236 * source is a file, the target will be a file, and likewise for 237 * directories. 238 * 239 * In (2), the real target is not directory, but "directory/source". 240 */ 241 if (Pflag) 242 r = lstat(to.p_path, &to_stat); 243 else 244 r = stat(to.p_path, &to_stat); 245 if (r == -1 && errno != ENOENT) { 246 err(EXIT_FAILURE, "%s", to.p_path); 247 /* NOTREACHED */ 248 } 249 if (r == -1 || !S_ISDIR(to_stat.st_mode)) { 250 /* 251 * Case (1). Target is not a directory. 252 */ 253 if (argc > 1) 254 cp_usage(); 255 /* 256 * Need to detect the case: 257 * cp -R dir foo 258 * Where dir is a directory and foo does not exist, where 259 * we want pathname concatenations turned on but not for 260 * the initial mkdir(). 261 */ 262 if (r == -1) { 263 if (rflag || (Rflag && (Lflag || Hflag))) 264 r = stat(*argv, &tmp_stat); 265 else 266 r = lstat(*argv, &tmp_stat); 267 if (r == -1) { 268 err(EXIT_FAILURE, "%s", *argv); 269 /* NOTREACHED */ 270 } 271 272 if (S_ISDIR(tmp_stat.st_mode) && (Rflag || rflag)) 273 type = DIR_TO_DNE; 274 else 275 type = FILE_TO_FILE; 276 } else 277 type = FILE_TO_FILE; 278 279 if (have_trailing_slash && type == FILE_TO_FILE) { 280 if (r == -1) 281 errx(1, "directory %s does not exist", 282 to.p_path); 283 else 284 errx(1, "%s is not a directory", to.p_path); 285 } 286 } else { 287 /* 288 * Case (2). Target is a directory. 289 */ 290 type = FILE_TO_DIR; 291 } 292 293 /* 294 * make "cp -rp src/ dst" behave like "cp -rp src dst" not 295 * like "cp -rp src/. dst" 296 */ 297 for (src = argv; *src; src++) { 298 size_t len = strlen(*src); 299 while (len-- > 1 && (*src)[len] == '/') 300 (*src)[len] = '\0'; 301 } 302 303 exit(copy(argv, type, fts_options)); 304 /* NOTREACHED */ 305 } 306 307 static int dnestack[MAXPATHLEN]; /* unlikely we'll have more nested dirs */ 308 static ssize_t dnesp; 309 static void 310 pushdne(int dne) 311 { 312 313 dnestack[dnesp++] = dne; 314 assert(dnesp < MAXPATHLEN); 315 } 316 317 static int 318 popdne(void) 319 { 320 int rv; 321 322 rv = dnestack[--dnesp]; 323 assert(dnesp >= 0); 324 return rv; 325 } 326 327 static int 328 copy(char *argv[], enum op type, int fts_options) 329 { 330 struct stat to_stat; 331 FTS *ftsp; 332 FTSENT *curr; 333 int base, dne, sval; 334 int this_failed, any_failed; 335 size_t nlen; 336 char *p, *target_mid; 337 338 base = 0; /* XXX gcc -Wuninitialized (see comment below) */ 339 340 if ((ftsp = fts_open(argv, fts_options, NULL)) == NULL) 341 err(EXIT_FAILURE, "%s", argv[0]); 342 /* NOTREACHED */ 343 for (any_failed = 0; (curr = fts_read(ftsp)) != NULL;) { 344 this_failed = 0; 345 switch (curr->fts_info) { 346 case FTS_NS: 347 case FTS_DNR: 348 case FTS_ERR: 349 warnx("%s: %s", curr->fts_path, 350 strerror(curr->fts_errno)); 351 this_failed = any_failed = 1; 352 continue; 353 case FTS_DC: /* Warn, continue. */ 354 warnx("%s: directory causes a cycle", curr->fts_path); 355 this_failed = any_failed = 1; 356 continue; 357 } 358 359 /* 360 * If we are in case (2) or (3) above, we need to append the 361 * source name to the target name. 362 */ 363 if (type != FILE_TO_FILE) { 364 if ((curr->fts_namelen + 365 to.target_end - to.p_path + 1) > MAXPATHLEN) { 366 warnx("%s/%s: name too long (not copied)", 367 to.p_path, curr->fts_name); 368 this_failed = any_failed = 1; 369 continue; 370 } 371 372 /* 373 * Need to remember the roots of traversals to create 374 * correct pathnames. If there's a directory being 375 * copied to a non-existent directory, e.g. 376 * cp -R a/dir noexist 377 * the resulting path name should be noexist/foo, not 378 * noexist/dir/foo (where foo is a file in dir), which 379 * is the case where the target exists. 380 * 381 * Also, check for "..". This is for correct path 382 * concatentation for paths ending in "..", e.g. 383 * cp -R .. /tmp 384 * Paths ending in ".." are changed to ".". This is 385 * tricky, but seems the easiest way to fix the problem. 386 * 387 * XXX 388 * Since the first level MUST be FTS_ROOTLEVEL, base 389 * is always initialized. 390 */ 391 if (curr->fts_level == FTS_ROOTLEVEL) { 392 if (type != DIR_TO_DNE) { 393 p = strrchr(curr->fts_path, '/'); 394 base = (p == NULL) ? 0 : 395 (int)(p - curr->fts_path + 1); 396 397 if (!strcmp(&curr->fts_path[base], 398 "..")) 399 base += 1; 400 } else 401 base = curr->fts_pathlen; 402 } 403 404 p = &curr->fts_path[base]; 405 nlen = curr->fts_pathlen - base; 406 target_mid = to.target_end; 407 if (*p != '/' && target_mid[-1] != '/') 408 *target_mid++ = '/'; 409 *target_mid = 0; 410 411 if (target_mid - to.p_path + nlen >= PATH_MAX) { 412 warnx("%s%s: name too long (not copied)", 413 to.p_path, p); 414 this_failed = any_failed = 1; 415 continue; 416 } 417 (void)strncat(target_mid, p, nlen); 418 to.p_end = target_mid + nlen; 419 *to.p_end = 0; 420 STRIP_TRAILING_SLASH(to); 421 } 422 423 sval = Pflag ? lstat(to.p_path, &to_stat) : stat(to.p_path, &to_stat); 424 /* Not an error but need to remember it happened */ 425 if (sval == -1) 426 dne = 1; 427 else { 428 if (to_stat.st_dev == curr->fts_statp->st_dev && 429 to_stat.st_ino == curr->fts_statp->st_ino) { 430 warnx("%s and %s are identical (not copied).", 431 to.p_path, curr->fts_path); 432 this_failed = any_failed = 1; 433 if (S_ISDIR(curr->fts_statp->st_mode)) 434 (void)fts_set(ftsp, curr, FTS_SKIP); 435 continue; 436 } 437 if (!S_ISDIR(curr->fts_statp->st_mode) && 438 S_ISDIR(to_stat.st_mode)) { 439 warnx("cannot overwrite directory %s with non-directory %s", 440 to.p_path, curr->fts_path); 441 this_failed = any_failed = 1; 442 continue; 443 } 444 dne = 0; 445 } 446 447 switch (curr->fts_statp->st_mode & S_IFMT) { 448 case S_IFLNK: 449 /* Catch special case of a non dangling symlink */ 450 if((fts_options & FTS_LOGICAL) || 451 ((fts_options & FTS_COMFOLLOW) && curr->fts_level == 0)) { 452 if (copy_file(curr, dne)) 453 this_failed = any_failed = 1; 454 } else { 455 if (copy_link(curr, !dne)) 456 this_failed = any_failed = 1; 457 } 458 break; 459 case S_IFDIR: 460 if (!Rflag && !rflag) { 461 if (curr->fts_info == FTS_D) 462 warnx("%s is a directory (not copied).", 463 curr->fts_path); 464 (void)fts_set(ftsp, curr, FTS_SKIP); 465 this_failed = any_failed = 1; 466 break; 467 } 468 469 /* 470 * Directories get noticed twice: 471 * In the first pass, create it if needed. 472 * In the second pass, after the children have been copied, set the permissions. 473 */ 474 if (curr->fts_info == FTS_D) /* First pass */ 475 { 476 /* 477 * If the directory doesn't exist, create the new 478 * one with the from file mode plus owner RWX bits, 479 * modified by the umask. Trade-off between being 480 * able to write the directory (if from directory is 481 * 555) and not causing a permissions race. If the 482 * umask blocks owner writes, we fail.. 483 */ 484 pushdne(dne); 485 if (dne) { 486 if (mkdir(to.p_path, 487 curr->fts_statp->st_mode | S_IRWXU) < 0) 488 err(EXIT_FAILURE, "%s", 489 to.p_path); 490 /* NOTREACHED */ 491 } else if (!S_ISDIR(to_stat.st_mode)) { 492 errno = ENOTDIR; 493 err(EXIT_FAILURE, "%s", 494 to.p_path); 495 /* NOTREACHED */ 496 } 497 } 498 else if (curr->fts_info == FTS_DP) /* Second pass */ 499 { 500 /* 501 * If not -p and directory didn't exist, set it to be 502 * the same as the from directory, umodified by the 503 * umask; arguably wrong, but it's been that way 504 * forever. 505 */ 506 if (pflag && setfile(curr->fts_statp, 0)) 507 this_failed = any_failed = 1; 508 else if ((dne = popdne())) 509 (void)chmod(to.p_path, 510 curr->fts_statp->st_mode); 511 } 512 else 513 { 514 warnx("directory %s encountered when not expected.", 515 curr->fts_path); 516 this_failed = any_failed = 1; 517 break; 518 } 519 520 break; 521 case S_IFBLK: 522 case S_IFCHR: 523 if (Rflag) { 524 if (copy_special(curr->fts_statp, !dne)) 525 this_failed = any_failed = 1; 526 } else 527 if (copy_file(curr, dne)) 528 this_failed = any_failed = 1; 529 break; 530 case S_IFIFO: 531 if (Rflag) { 532 if (copy_fifo(curr->fts_statp, !dne)) 533 this_failed = any_failed = 1; 534 } else 535 if (copy_file(curr, dne)) 536 this_failed = any_failed = 1; 537 break; 538 default: 539 if (copy_file(curr, dne)) 540 this_failed = any_failed = 1; 541 break; 542 } 543 if (vflag && !this_failed) 544 (void)printf("%s -> %s\n", curr->fts_path, to.p_path); 545 } 546 if (errno) { 547 err(EXIT_FAILURE, "fts_read"); 548 /* NOTREACHED */ 549 } 550 (void)fts_close(ftsp); 551 return (any_failed); 552 } 553
