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, ch, fts_options, r, have_trailing_slash; 102 char *target; 103 104 fts_options = FTS_NOCHDIR | FTS_PHYSICAL; 105 Hflag = Lflag = 0; 106 while ((ch = getopt(argc, argv, "HLPRafilnprvx")) != -1) 107 switch (ch) { 108 case 'H': 109 Hflag = 1; 110 Lflag = 0; 111 break; 112 case 'L': 113 Lflag = 1; 114 Hflag = 0; 115 break; 116 case 'P': 117 Hflag = Lflag = 0; 118 break; 119 case 'R': 120 Rflag = 1; 121 break; 122 case 'a': 123 pflag = 1; 124 Rflag = 1; 125 Hflag = Lflag = 0; 126 break; 127 case 'f': 128 fflag = 1; 129 iflag = nflag = 0; 130 break; 131 case 'i': 132 iflag = 1; 133 fflag = nflag = 0; 134 break; 135 case 'l': 136 lflag = 1; 137 break; 138 case 'n': 139 nflag = 1; 140 fflag = iflag = 0; 141 break; 142 case 'p': 143 pflag = 1; 144 break; 145 case 'r': 146 rflag = Lflag = 1; 147 Hflag = 0; 148 break; 149 case 'v': 150 vflag = 1; 151 break; 152 case 'x': 153 fts_options |= FTS_XDEV; 154 break; 155 default: 156 usage(); 157 break; 158 } 159 argc -= optind; 160 argv += optind; 161 162 if (argc < 2) 163 usage(); 164 165 if (Rflag && rflag) 166 errx(1, "the -R and -r options may not be specified together"); 167 if (rflag) 168 Rflag = 1; 169 if (Rflag) { 170 if (Hflag) 171 fts_options |= FTS_COMFOLLOW; 172 if (Lflag) { 173 fts_options &= ~FTS_PHYSICAL; 174 fts_options |= FTS_LOGICAL; 175 } 176 } else { 177 fts_options &= ~FTS_PHYSICAL; 178 fts_options |= FTS_LOGICAL | FTS_COMFOLLOW; 179 } 180 (void)signal(SIGINFO, siginfo); 181 182 /* Save the target base in "to". */ 183 target = argv[--argc]; 184 if (strlcpy(to.p_path, target, sizeof(to.p_path)) >= sizeof(to.p_path)) 185 errx(1, "%s: name too long", target); 186 to.p_end = to.p_path + strlen(to.p_path); 187 if (to.p_path == to.p_end) { 188 *to.p_end++ = '.'; 189 *to.p_end = 0; 190 } 191 have_trailing_slash = (to.p_end[-1] == '/'); 192 if (have_trailing_slash) 193 STRIP_TRAILING_SLASH(to); 194 to.target_end = to.p_end; 195 196 /* Set end of argument list for fts(3). */ 197 argv[argc] = NULL; 198 199 /* 200 * Cp has two distinct cases: 201 * 202 * cp [-R] source target 203 * cp [-R] source1 ... sourceN directory 204 * 205 * In both cases, source can be either a file or a directory. 206 * 207 * In (1), the target becomes a copy of the source. That is, if the 208 * source is a file, the target will be a file, and likewise for 209 * directories. 210 * 211 * In (2), the real target is not directory, but "directory/source". 212 */ 213 r = stat(to.p_path, &to_stat); 214 if (r == -1 && errno != ENOENT) 215 err(1, "%s", to.p_path); 216 if (r == -1 || !S_ISDIR(to_stat.st_mode)) { 217 /* 218 * Case (1). Target is not a directory. 219 */ 220 if (argc > 1) 221 errx(1, "%s is not a directory", to.p_path); 222 223 /* 224 * Need to detect the case: 225 * cp -R dir foo 226 * Where dir is a directory and foo does not exist, where 227 * we want pathname concatenations turned on but not for 228 * the initial mkdir(). 229 */ 230 if (r == -1) { 231 if (Rflag && (Lflag || Hflag)) 232 stat(*argv, &tmp_stat); 233 else 234 lstat(*argv, &tmp_stat); 235 236 if (S_ISDIR(tmp_stat.st_mode) && Rflag) 237 type = DIR_TO_DNE; 238 else 239 type = FILE_TO_FILE; 240 } else 241 type = FILE_TO_FILE; 242 243 if (have_trailing_slash && type == FILE_TO_FILE) { 244 if (r == -1) 245 errx(1, "directory %s does not exist", 246 to.p_path); 247 else 248 errx(1, "%s is not a directory", to.p_path); 249 } 250 } else 251 /* 252 * Case (2). Target is a directory. 253 */ 254 type = FILE_TO_DIR; 255 256 exit (copy(argv, type, fts_options)); 257 } 258 259 static int 260 copy(char *argv[], enum op type, int fts_options) 261 { 262 struct stat to_stat; 263 FTS *ftsp; 264 FTSENT *curr; 265 int base = 0, dne, badcp, rval; 266 size_t nlen; 267 char *p, *target_mid; 268 mode_t mask, mode; 269 270 /* 271 * Keep an inverted copy of the umask, for use in correcting 272 * permissions on created directories when not using -p. 273 */ 274 mask = ~umask(0777); 275 umask(~mask); 276 277 if ((ftsp = fts_open(argv, fts_options, mastercmp)) == NULL) 278 err(1, "fts_open"); 279 for (badcp = rval = 0; (curr = fts_read(ftsp)) != NULL; badcp = 0) { 280 switch (curr->fts_info) { 281 case FTS_NS: 282 case FTS_DNR: 283 case FTS_ERR: 284 warnx("%s: %s", 285 curr->fts_path, strerror(curr->fts_errno)); 286 badcp = rval = 1; 287 continue; 288 case FTS_DC: /* Warn, continue. */ 289 warnx("%s: directory causes a cycle", curr->fts_path); 290 badcp = rval = 1; 291 continue; 292 default: 293 ; 294 } 295 296 /* 297 * If we are in case (2) or (3) above, we need to append the 298 * source name to the target name. 299 */ 300 if (type != FILE_TO_FILE) { 301 /* 302 * Need to remember the roots of traversals to create 303 * correct pathnames. If there's a directory being 304 * copied to a non-existent directory, e.g. 305 * cp -R a/dir noexist 306 * the resulting path name should be noexist/foo, not 307 * noexist/dir/foo (where foo is a file in dir), which 308 * is the case where the target exists. 309 * 310 * Also, check for "..". This is for correct path 311 * concatenation for paths ending in "..", e.g. 312 * cp -R .. /tmp 313 * Paths ending in ".." are changed to ".". This is 314 * tricky, but seems the easiest way to fix the problem. 315 * 316 * XXX 317 * Since the first level MUST be FTS_ROOTLEVEL, base 318 * is always initialized. 319 */ 320 if (curr->fts_level == FTS_ROOTLEVEL) { 321 if (type != DIR_TO_DNE) { 322 p = strrchr(curr->fts_path, '/'); 323 base = (p == NULL) ? 0 : 324 (int)(p - curr->fts_path + 1); 325 326 if (!strcmp(&curr->fts_path[base], 327 "..")) 328 base += 1; 329 } else 330 base = curr->fts_pathlen; 331 } 332 333 p = &curr->fts_path[base]; 334 nlen = curr->fts_pathlen - base; 335 target_mid = to.target_end; 336 if (*p != '/' && target_mid[-1] != '/') 337 *target_mid++ = '/'; 338 *target_mid = 0; 339 if (target_mid - to.p_path + nlen >= PATH_MAX) { 340 warnx("%s%s: name too long (not copied)", 341 to.p_path, p); 342 badcp = rval = 1; 343 continue; 344 } 345 (void)strncat(target_mid, p, nlen); 346 to.p_end = target_mid + nlen; 347 *to.p_end = 0; 348 STRIP_TRAILING_SLASH(to); 349 } 350 351 if (curr->fts_info == FTS_DP) { 352 /* 353 * We are nearly finished with this directory. If we 354 * didn't actually copy it, or otherwise don't need to 355 * change its attributes, then we are done. 356 */ 357 if (!curr->fts_number) 358 continue; 359 /* 360 * If -p is in effect, set all the attributes. 361 * Otherwise, set the correct permissions, limited 362 * by the umask. Optimise by avoiding a chmod() 363 * if possible (which is usually the case if we 364 * made the directory). Note that mkdir() does not 365 * honour setuid, setgid and sticky bits, but we 366 * normally want to preserve them on directories. 367 */ 368 if (pflag) { 369 if (setfile(curr->fts_statp, -1)) 370 rval = 1; 371 if (preserve_dir_acls(curr->fts_statp, 372 curr->fts_accpath, to.p_path) != 0) 373 rval = 1; 374 } else { 375 mode = curr->fts_statp->st_mode; 376 if ((mode & (S_ISUID | S_ISGID | S_ISTXT)) || 377 ((mode | S_IRWXU) & mask) != (mode & mask)) 378 if (chmod(to.p_path, mode & mask) != 0){ 379 warn("chmod: %s", to.p_path); 380 rval = 1; 381 } 382 } 383 continue; 384 } 385 386 /* Not an error but need to remember it happened */ 387 if (stat(to.p_path, &to_stat) == -1) 388 dne = 1; 389 else { 390 if (to_stat.st_dev == curr->fts_statp->st_dev && 391 to_stat.st_ino == curr->fts_statp->st_ino) { 392 warnx("%s and %s are identical (not copied).", 393 to.p_path, curr->fts_path); 394 badcp = rval = 1; 395 if (S_ISDIR(curr->fts_statp->st_mode)) 396 (void)fts_set(ftsp, curr, FTS_SKIP); 397 continue; 398 } 399 if (!S_ISDIR(curr->fts_statp->st_mode) && 400 S_ISDIR(to_stat.st_mode)) { 401 warnx("cannot overwrite directory %s with " 402 "non-directory %s", 403 to.p_path, curr->fts_path); 404 badcp = rval = 1; 405 continue; 406 } 407 dne = 0; 408 } 409 410 switch (curr->fts_statp->st_mode & S_IFMT) { 411 case S_IFLNK: 412 /* Catch special case of a non-dangling symlink */ 413 if ((fts_options & FTS_LOGICAL) || 414 ((fts_options & FTS_COMFOLLOW) && 415 curr->fts_level == 0)) { 416 if (copy_file(curr, dne)) 417 badcp = rval = 1; 418 } else { 419 if (copy_link(curr, !dne)) 420 badcp = rval = 1; 421 } 422 break; 423 case S_IFDIR: 424 if (!Rflag) { 425 warnx("%s is a directory (not copied).", 426 curr->fts_path); 427 (void)fts_set(ftsp, curr, FTS_SKIP); 428 badcp = rval = 1; 429 break; 430 } 431 /* 432 * If the directory doesn't exist, create the new 433 * one with the from file mode plus owner RWX bits, 434 * modified by the umask. Trade-off between being 435 * able to write the directory (if from directory is 436 * 555) and not causing a permissions race. If the 437 * umask blocks owner writes, we fail.. 438 */ 439 if (dne) { 440 if (mkdir(to.p_path, 441 curr->fts_statp->st_mode | S_IRWXU) < 0) 442 err(1, "%s", to.p_path); 443 } else if (!S_ISDIR(to_stat.st_mode)) { 444 errno = ENOTDIR; 445 err(1, "%s", to.p_path); 446 } 447 /* 448 * Arrange to correct directory attributes later 449 * (in the post-order phase) if this is a new 450 * directory, or if the -p flag is in effect. 451 */ 452 curr->fts_number = pflag || dne; 453 break; 454 case S_IFBLK: 455 case S_IFCHR: 456 if (Rflag) { 457 if (copy_special(curr->fts_statp, !dne)) 458 badcp = rval = 1; 459 } else { 460 if (copy_file(curr, dne)) 461 badcp = rval = 1; 462 } 463 break; 464 case S_IFSOCK: 465 warnx("%s is a socket (not copied).", 466 curr->fts_path); 467 break; 468 case S_IFIFO: 469 if (Rflag) { 470 if (copy_fifo(curr->fts_statp, !dne)) 471 badcp = rval = 1; 472 } else { 473 if (copy_file(curr, dne)) 474 badcp = rval = 1; 475 } 476 break; 477 default: 478 if (copy_file(curr, dne)) 479 badcp = rval = 1; 480 break; 481 } 482 if (vflag && !badcp) 483 (void)printf("%s -> %s\n", curr->fts_path, to.p_path); 484 } 485 if (errno) 486 err(1, "fts_read"); 487 fts_close(ftsp); 488 return (rval); 489 } 490 491 /* 492 * mastercmp -- 493 * The comparison function for the copy order. The order is to copy 494 * non-directory files before directory files. The reason for this 495 * is because files tend to be in the same cylinder group as their 496 * parent directory, whereas directories tend not to be. Copying the 497 * files first reduces seeking. 498 */ 499 static int 500 mastercmp(const FTSENT * const *a, const FTSENT * const *b) 501 { 502 int a_info, b_info; 503 504 a_info = (*a)->fts_info; 505 if (a_info == FTS_ERR || a_info == FTS_NS || a_info == FTS_DNR) 506 return (0); 507 b_info = (*b)->fts_info; 508 if (b_info == FTS_ERR || b_info == FTS_NS || b_info == FTS_DNR) 509 return (0); 510 if (a_info == FTS_D) 511 return (-1); 512 if (b_info == FTS_D) 513 return (1); 514 return (0); 515 } 516 517 static void 518 siginfo(int sig __unused) 519 { 520 521 info = 1; 522 } 523