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