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