1 /*- 2 * Copyright (c) 1988, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * David Hitz of Auspex Systems Inc. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 4. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 #if 0 34 #ifndef lint 35 static char const copyright[] = 36 "@(#) Copyright (c) 1988, 1993, 1994\n\ 37 The Regents of the University of California. All rights reserved.\n"; 38 #endif /* not lint */ 39 40 #ifndef lint 41 static char sccsid[] = "@(#)cp.c 8.2 (Berkeley) 4/1/94"; 42 #endif /* not lint */ 43 #endif 44 #include <sys/cdefs.h> 45 __FBSDID("$FreeBSD$"); 46 47 /* 48 * Cp copies source files to target files. 49 * 50 * The global PATH_T structure "to" always contains the path to the 51 * current target file. Since fts(3) does not change directories, 52 * this path can be either absolute or dot-relative. 53 * 54 * The basic algorithm is to initialize "to" and use fts(3) to traverse 55 * the file hierarchy rooted in the argument list. A trivial case is the 56 * case of 'cp file1 file2'. The more interesting case is the case of 57 * 'cp file1 file2 ... fileN dir' where the hierarchy is traversed and the 58 * path (relative to the root of the traversal) is appended to dir (stored 59 * in "to") to form the final target path. 60 */ 61 62 #include <sys/types.h> 63 #include <sys/stat.h> 64 65 #include <err.h> 66 #include <errno.h> 67 #include <fts.h> 68 #include <limits.h> 69 #include <signal.h> 70 #include <stdio.h> 71 #include <stdlib.h> 72 #include <string.h> 73 #include <unistd.h> 74 75 #include "extern.h" 76 77 #define STRIP_TRAILING_SLASH(p) { \ 78 while ((p).p_end > (p).p_path + 1 && (p).p_end[-1] == '/') \ 79 *--(p).p_end = 0; \ 80 } 81 82 static char emptystring[] = ""; 83 84 PATH_T to = { to.p_path, emptystring, "" }; 85 86 int fflag, iflag, lflag, nflag, pflag, vflag; 87 static int Rflag, rflag; 88 volatile sig_atomic_t info; 89 90 enum op { FILE_TO_FILE, FILE_TO_DIR, DIR_TO_DNE }; 91 92 static int copy(char *[], enum op, int); 93 static int mastercmp(const FTSENT * const *, const FTSENT * const *); 94 static void siginfo(int __unused); 95 96 int 97 main(int argc, char *argv[]) 98 { 99 struct stat to_stat, tmp_stat; 100 enum op type; 101 int Hflag, Lflag, Pflag, ch, fts_options, r, have_trailing_slash; 102 char *target; 103 104 fts_options = FTS_NOCHDIR | FTS_PHYSICAL; 105 Hflag = Lflag = Pflag = 0; 106 while ((ch = getopt(argc, argv, "HLPRafilnprvx")) != -1) 107 switch (ch) { 108 case 'H': 109 Hflag = 1; 110 Lflag = Pflag = 0; 111 break; 112 case 'L': 113 Lflag = 1; 114 Hflag = Pflag = 0; 115 break; 116 case 'P': 117 Pflag = 1; 118 Hflag = Lflag = 0; 119 break; 120 case 'R': 121 Rflag = 1; 122 break; 123 case 'a': 124 Pflag = 1; 125 pflag = 1; 126 Rflag = 1; 127 Hflag = Lflag = 0; 128 break; 129 case 'f': 130 fflag = 1; 131 iflag = nflag = 0; 132 break; 133 case 'i': 134 iflag = 1; 135 fflag = nflag = 0; 136 break; 137 case 'l': 138 lflag = 1; 139 break; 140 case 'n': 141 nflag = 1; 142 fflag = iflag = 0; 143 break; 144 case 'p': 145 pflag = 1; 146 break; 147 case 'r': 148 rflag = Lflag = 1; 149 Hflag = Pflag = 0; 150 break; 151 case 'v': 152 vflag = 1; 153 break; 154 case 'x': 155 fts_options |= FTS_XDEV; 156 break; 157 default: 158 usage(); 159 break; 160 } 161 argc -= optind; 162 argv += optind; 163 164 if (argc < 2) 165 usage(); 166 167 if (Rflag && rflag) 168 errx(1, "the -R and -r options may not be specified together"); 169 if (rflag) 170 Rflag = 1; 171 if (Rflag) { 172 if (Hflag) 173 fts_options |= FTS_COMFOLLOW; 174 if (Lflag) { 175 fts_options &= ~FTS_PHYSICAL; 176 fts_options |= FTS_LOGICAL; 177 } 178 } else { 179 fts_options &= ~FTS_PHYSICAL; 180 fts_options |= FTS_LOGICAL | FTS_COMFOLLOW; 181 } 182 (void)signal(SIGINFO, siginfo); 183 184 /* Save the target base in "to". */ 185 target = argv[--argc]; 186 if (strlcpy(to.p_path, target, sizeof(to.p_path)) >= sizeof(to.p_path)) 187 errx(1, "%s: name too long", target); 188 to.p_end = to.p_path + strlen(to.p_path); 189 if (to.p_path == to.p_end) { 190 *to.p_end++ = '.'; 191 *to.p_end = 0; 192 } 193 have_trailing_slash = (to.p_end[-1] == '/'); 194 if (have_trailing_slash) 195 STRIP_TRAILING_SLASH(to); 196 to.target_end = to.p_end; 197 198 /* Set end of argument list for fts(3). */ 199 argv[argc] = NULL; 200 201 /* 202 * Cp has two distinct cases: 203 * 204 * cp [-R] source target 205 * cp [-R] source1 ... sourceN directory 206 * 207 * In both cases, source can be either a file or a directory. 208 * 209 * In (1), the target becomes a copy of the source. That is, if the 210 * source is a file, the target will be a file, and likewise for 211 * directories. 212 * 213 * In (2), the real target is not directory, but "directory/source". 214 */ 215 r = stat(to.p_path, &to_stat); 216 if (r == -1 && errno != ENOENT) 217 err(1, "%s", to.p_path); 218 if (r == -1 || !S_ISDIR(to_stat.st_mode)) { 219 /* 220 * Case (1). Target is not a directory. 221 */ 222 if (argc > 1) 223 errx(1, "%s is not a directory", to.p_path); 224 225 /* 226 * Need to detect the case: 227 * cp -R dir foo 228 * Where dir is a directory and foo does not exist, where 229 * we want pathname concatenations turned on but not for 230 * the initial mkdir(). 231 */ 232 if (r == -1) { 233 if (Rflag && (Lflag || Hflag)) 234 stat(*argv, &tmp_stat); 235 else 236 lstat(*argv, &tmp_stat); 237 238 if (S_ISDIR(tmp_stat.st_mode) && Rflag) 239 type = DIR_TO_DNE; 240 else 241 type = FILE_TO_FILE; 242 } else 243 type = FILE_TO_FILE; 244 245 if (have_trailing_slash && type == FILE_TO_FILE) { 246 if (r == -1) 247 errx(1, "directory %s does not exist", 248 to.p_path); 249 else 250 errx(1, "%s is not a directory", to.p_path); 251 } 252 } else 253 /* 254 * Case (2). Target is a directory. 255 */ 256 type = FILE_TO_DIR; 257 258 exit (copy(argv, type, fts_options)); 259 } 260 261 static int 262 copy(char *argv[], enum op type, int fts_options) 263 { 264 struct stat to_stat; 265 FTS *ftsp; 266 FTSENT *curr; 267 int base = 0, dne, badcp, rval; 268 size_t nlen; 269 char *p, *target_mid; 270 mode_t mask, mode; 271 272 /* 273 * Keep an inverted copy of the umask, for use in correcting 274 * permissions on created directories when not using -p. 275 */ 276 mask = ~umask(0777); 277 umask(~mask); 278 279 if ((ftsp = fts_open(argv, fts_options, mastercmp)) == NULL) 280 err(1, "fts_open"); 281 for (badcp = rval = 0; (curr = fts_read(ftsp)) != NULL; badcp = 0) { 282 switch (curr->fts_info) { 283 case FTS_NS: 284 case FTS_DNR: 285 case FTS_ERR: 286 warnx("%s: %s", 287 curr->fts_path, strerror(curr->fts_errno)); 288 badcp = rval = 1; 289 continue; 290 case FTS_DC: /* Warn, continue. */ 291 warnx("%s: directory causes a cycle", curr->fts_path); 292 badcp = rval = 1; 293 continue; 294 default: 295 ; 296 } 297 298 /* 299 * If we are in case (2) or (3) above, we need to append the 300 * source name to the target name. 301 */ 302 if (type != FILE_TO_FILE) { 303 /* 304 * Need to remember the roots of traversals to create 305 * correct pathnames. If there's a directory being 306 * copied to a non-existent directory, e.g. 307 * cp -R a/dir noexist 308 * the resulting path name should be noexist/foo, not 309 * noexist/dir/foo (where foo is a file in dir), which 310 * is the case where the target exists. 311 * 312 * Also, check for "..". This is for correct path 313 * concatenation for paths ending in "..", e.g. 314 * cp -R .. /tmp 315 * Paths ending in ".." are changed to ".". This is 316 * tricky, but seems the easiest way to fix the problem. 317 * 318 * XXX 319 * Since the first level MUST be FTS_ROOTLEVEL, base 320 * is always initialized. 321 */ 322 if (curr->fts_level == FTS_ROOTLEVEL) { 323 if (type != DIR_TO_DNE) { 324 p = strrchr(curr->fts_path, '/'); 325 base = (p == NULL) ? 0 : 326 (int)(p - curr->fts_path + 1); 327 328 if (!strcmp(&curr->fts_path[base], 329 "..")) 330 base += 1; 331 } else 332 base = curr->fts_pathlen; 333 } 334 335 p = &curr->fts_path[base]; 336 nlen = curr->fts_pathlen - base; 337 target_mid = to.target_end; 338 if (*p != '/' && target_mid[-1] != '/') 339 *target_mid++ = '/'; 340 *target_mid = 0; 341 if (target_mid - to.p_path + nlen >= PATH_MAX) { 342 warnx("%s%s: name too long (not copied)", 343 to.p_path, p); 344 badcp = rval = 1; 345 continue; 346 } 347 (void)strncat(target_mid, p, nlen); 348 to.p_end = target_mid + nlen; 349 *to.p_end = 0; 350 STRIP_TRAILING_SLASH(to); 351 } 352 353 if (curr->fts_info == FTS_DP) { 354 /* 355 * We are nearly finished with this directory. If we 356 * didn't actually copy it, or otherwise don't need to 357 * change its attributes, then we are done. 358 */ 359 if (!curr->fts_number) 360 continue; 361 /* 362 * If -p is in effect, set all the attributes. 363 * Otherwise, set the correct permissions, limited 364 * by the umask. Optimise by avoiding a chmod() 365 * if possible (which is usually the case if we 366 * made the directory). Note that mkdir() does not 367 * honour setuid, setgid and sticky bits, but we 368 * normally want to preserve them on directories. 369 */ 370 if (pflag) { 371 if (setfile(curr->fts_statp, -1)) 372 rval = 1; 373 if (preserve_dir_acls(curr->fts_statp, 374 curr->fts_accpath, to.p_path) != 0) 375 rval = 1; 376 } else { 377 mode = curr->fts_statp->st_mode; 378 if ((mode & (S_ISUID | S_ISGID | S_ISTXT)) || 379 ((mode | S_IRWXU) & mask) != (mode & mask)) 380 if (chmod(to.p_path, mode & mask) != 0){ 381 warn("chmod: %s", to.p_path); 382 rval = 1; 383 } 384 } 385 continue; 386 } 387 388 /* Not an error but need to remember it happened */ 389 if (stat(to.p_path, &to_stat) == -1) 390 dne = 1; 391 else { 392 if (to_stat.st_dev == curr->fts_statp->st_dev && 393 to_stat.st_ino == curr->fts_statp->st_ino) { 394 warnx("%s and %s are identical (not copied).", 395 to.p_path, curr->fts_path); 396 badcp = rval = 1; 397 if (S_ISDIR(curr->fts_statp->st_mode)) 398 (void)fts_set(ftsp, curr, FTS_SKIP); 399 continue; 400 } 401 if (!S_ISDIR(curr->fts_statp->st_mode) && 402 S_ISDIR(to_stat.st_mode)) { 403 warnx("cannot overwrite directory %s with " 404 "non-directory %s", 405 to.p_path, curr->fts_path); 406 badcp = rval = 1; 407 continue; 408 } 409 dne = 0; 410 } 411 412 switch (curr->fts_statp->st_mode & S_IFMT) { 413 case S_IFLNK: 414 /* Catch special case of a non-dangling symlink */ 415 if ((fts_options & FTS_LOGICAL) || 416 ((fts_options & FTS_COMFOLLOW) && 417 curr->fts_level == 0)) { 418 if (copy_file(curr, dne)) 419 badcp = rval = 1; 420 } else { 421 if (copy_link(curr, !dne)) 422 badcp = rval = 1; 423 } 424 break; 425 case S_IFDIR: 426 if (!Rflag) { 427 warnx("%s is a directory (not copied).", 428 curr->fts_path); 429 (void)fts_set(ftsp, curr, FTS_SKIP); 430 badcp = rval = 1; 431 break; 432 } 433 /* 434 * If the directory doesn't exist, create the new 435 * one with the from file mode plus owner RWX bits, 436 * modified by the umask. Trade-off between being 437 * able to write the directory (if from directory is 438 * 555) and not causing a permissions race. If the 439 * umask blocks owner writes, we fail.. 440 */ 441 if (dne) { 442 if (mkdir(to.p_path, 443 curr->fts_statp->st_mode | S_IRWXU) < 0) 444 err(1, "%s", to.p_path); 445 } else if (!S_ISDIR(to_stat.st_mode)) { 446 errno = ENOTDIR; 447 err(1, "%s", to.p_path); 448 } 449 /* 450 * Arrange to correct directory attributes later 451 * (in the post-order phase) if this is a new 452 * directory, or if the -p flag is in effect. 453 */ 454 curr->fts_number = pflag || dne; 455 break; 456 case S_IFBLK: 457 case S_IFCHR: 458 if (Rflag) { 459 if (copy_special(curr->fts_statp, !dne)) 460 badcp = rval = 1; 461 } else { 462 if (copy_file(curr, dne)) 463 badcp = rval = 1; 464 } 465 break; 466 case S_IFSOCK: 467 warnx("%s is a socket (not copied).", 468 curr->fts_path); 469 break; 470 case S_IFIFO: 471 if (Rflag) { 472 if (copy_fifo(curr->fts_statp, !dne)) 473 badcp = rval = 1; 474 } else { 475 if (copy_file(curr, dne)) 476 badcp = rval = 1; 477 } 478 break; 479 default: 480 if (copy_file(curr, dne)) 481 badcp = rval = 1; 482 break; 483 } 484 if (vflag && !badcp) 485 (void)printf("%s -> %s\n", curr->fts_path, to.p_path); 486 } 487 if (errno) 488 err(1, "fts_read"); 489 fts_close(ftsp); 490 return (rval); 491 } 492 493 /* 494 * mastercmp -- 495 * The comparison function for the copy order. The order is to copy 496 * non-directory files before directory files. The reason for this 497 * is because files tend to be in the same cylinder group as their 498 * parent directory, whereas directories tend not to be. Copying the 499 * files first reduces seeking. 500 */ 501 static int 502 mastercmp(const FTSENT * const *a, const FTSENT * const *b) 503 { 504 int a_info, b_info; 505 506 a_info = (*a)->fts_info; 507 if (a_info == FTS_ERR || a_info == FTS_NS || a_info == FTS_DNR) 508 return (0); 509 b_info = (*b)->fts_info; 510 if (b_info == FTS_ERR || b_info == FTS_NS || b_info == FTS_DNR) 511 return (0); 512 if (a_info == FTS_D) 513 return (-1); 514 if (b_info == FTS_D) 515 return (1); 516 return (0); 517 } 518 519 static void 520 siginfo(int sig __unused) 521 { 522 523 info = 1; 524 } 525