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 usage(); 215 exit(1); 216 } 217 /* 218 * Need to detect the case: 219 * cp -R dir foo 220 * Where dir is a directory and foo does not exist, where 221 * we want pathname concatenations turned on but not for 222 * the initial mkdir(). 223 */ 224 if (r == -1) { 225 if (Rflag && (Lflag || Hflag)) 226 stat(*argv, &tmp_stat); 227 else 228 lstat(*argv, &tmp_stat); 229 230 if (S_ISDIR(tmp_stat.st_mode) && Rflag) 231 type = DIR_TO_DNE; 232 else 233 type = FILE_TO_FILE; 234 } else 235 type = FILE_TO_FILE; 236 237 if (have_trailing_slash && type == FILE_TO_FILE) { 238 if (r == -1) 239 errx(1, "directory %s does not exist", 240 to.p_path); 241 else 242 errx(1, "%s is not a directory", to.p_path); 243 } 244 } else 245 /* 246 * Case (2). Target is a directory. 247 */ 248 type = FILE_TO_DIR; 249 250 exit (copy(argv, type, fts_options)); 251 } 252 253 static int 254 copy(char *argv[], enum op type, int fts_options) 255 { 256 struct stat to_stat; 257 FTS *ftsp; 258 FTSENT *curr; 259 int base = 0, dne, badcp, rval; 260 size_t nlen; 261 char *p, *target_mid; 262 mode_t mask, mode; 263 264 /* 265 * Keep an inverted copy of the umask, for use in correcting 266 * permissions on created directories when not using -p. 267 */ 268 mask = ~umask(0777); 269 umask(~mask); 270 271 if ((ftsp = fts_open(argv, fts_options, mastercmp)) == NULL) 272 err(1, "fts_open"); 273 for (badcp = rval = 0; (curr = fts_read(ftsp)) != NULL; badcp = 0) { 274 switch (curr->fts_info) { 275 case FTS_NS: 276 case FTS_DNR: 277 case FTS_ERR: 278 warnx("%s: %s", 279 curr->fts_path, strerror(curr->fts_errno)); 280 badcp = rval = 1; 281 continue; 282 case FTS_DC: /* Warn, continue. */ 283 warnx("%s: directory causes a cycle", curr->fts_path); 284 badcp = rval = 1; 285 continue; 286 default: 287 ; 288 } 289 290 /* 291 * If we are in case (2) or (3) above, we need to append the 292 * source name to the target name. 293 */ 294 if (type != FILE_TO_FILE) { 295 /* 296 * Need to remember the roots of traversals to create 297 * correct pathnames. If there's a directory being 298 * copied to a non-existent directory, e.g. 299 * cp -R a/dir noexist 300 * the resulting path name should be noexist/foo, not 301 * noexist/dir/foo (where foo is a file in dir), which 302 * is the case where the target exists. 303 * 304 * Also, check for "..". This is for correct path 305 * concatenation for paths ending in "..", e.g. 306 * cp -R .. /tmp 307 * Paths ending in ".." are changed to ".". This is 308 * tricky, but seems the easiest way to fix the problem. 309 * 310 * XXX 311 * Since the first level MUST be FTS_ROOTLEVEL, base 312 * is always initialized. 313 */ 314 if (curr->fts_level == FTS_ROOTLEVEL) { 315 if (type != DIR_TO_DNE) { 316 p = strrchr(curr->fts_path, '/'); 317 base = (p == NULL) ? 0 : 318 (int)(p - curr->fts_path + 1); 319 320 if (!strcmp(&curr->fts_path[base], 321 "..")) 322 base += 1; 323 } else 324 base = curr->fts_pathlen; 325 } 326 327 p = &curr->fts_path[base]; 328 nlen = curr->fts_pathlen - base; 329 target_mid = to.target_end; 330 if (*p != '/' && target_mid[-1] != '/') 331 *target_mid++ = '/'; 332 *target_mid = 0; 333 if (target_mid - to.p_path + nlen >= PATH_MAX) { 334 warnx("%s%s: name too long (not copied)", 335 to.p_path, p); 336 badcp = rval = 1; 337 continue; 338 } 339 (void)strncat(target_mid, p, nlen); 340 to.p_end = target_mid + nlen; 341 *to.p_end = 0; 342 STRIP_TRAILING_SLASH(to); 343 } 344 345 if (curr->fts_info == FTS_DP) { 346 /* 347 * We are nearly finished with this directory. If we 348 * didn't actually copy it, or otherwise don't need to 349 * change its attributes, then we are done. 350 */ 351 if (!curr->fts_number) 352 continue; 353 /* 354 * If -p is in effect, set all the attributes. 355 * Otherwise, set the correct permissions, limited 356 * by the umask. Optimise by avoiding a chmod() 357 * if possible (which is usually the case if we 358 * made the directory). Note that mkdir() does not 359 * honour setuid, setgid and sticky bits, but we 360 * normally want to preserve them on directories. 361 */ 362 if (pflag) { 363 if (setfile(curr->fts_statp, -1)) 364 rval = 1; 365 if (preserve_dir_acls(curr->fts_statp, 366 curr->fts_accpath, to.p_path) != 0) 367 rval = 1; 368 } else { 369 mode = curr->fts_statp->st_mode; 370 if ((mode & (S_ISUID | S_ISGID | S_ISTXT)) || 371 ((mode | S_IRWXU) & mask) != (mode & mask)) 372 if (chmod(to.p_path, mode & mask) != 0){ 373 warn("chmod: %s", to.p_path); 374 rval = 1; 375 } 376 } 377 continue; 378 } 379 380 /* Not an error but need to remember it happened */ 381 if (stat(to.p_path, &to_stat) == -1) 382 dne = 1; 383 else { 384 if (to_stat.st_dev == curr->fts_statp->st_dev && 385 to_stat.st_ino == curr->fts_statp->st_ino) { 386 warnx("%s and %s are identical (not copied).", 387 to.p_path, curr->fts_path); 388 badcp = rval = 1; 389 if (S_ISDIR(curr->fts_statp->st_mode)) 390 (void)fts_set(ftsp, curr, FTS_SKIP); 391 continue; 392 } 393 if (!S_ISDIR(curr->fts_statp->st_mode) && 394 S_ISDIR(to_stat.st_mode)) { 395 warnx("cannot overwrite directory %s with " 396 "non-directory %s", 397 to.p_path, curr->fts_path); 398 badcp = rval = 1; 399 continue; 400 } 401 dne = 0; 402 } 403 404 switch (curr->fts_statp->st_mode & S_IFMT) { 405 case S_IFLNK: 406 /* Catch special case of a non-dangling symlink */ 407 if ((fts_options & FTS_LOGICAL) || 408 ((fts_options & FTS_COMFOLLOW) && 409 curr->fts_level == 0)) { 410 if (copy_file(curr, dne)) 411 badcp = rval = 1; 412 } else { 413 if (copy_link(curr, !dne)) 414 badcp = rval = 1; 415 } 416 break; 417 case S_IFDIR: 418 if (!Rflag) { 419 warnx("%s is a directory (not copied).", 420 curr->fts_path); 421 (void)fts_set(ftsp, curr, FTS_SKIP); 422 badcp = rval = 1; 423 break; 424 } 425 /* 426 * If the directory doesn't exist, create the new 427 * one with the from file mode plus owner RWX bits, 428 * modified by the umask. Trade-off between being 429 * able to write the directory (if from directory is 430 * 555) and not causing a permissions race. If the 431 * umask blocks owner writes, we fail.. 432 */ 433 if (dne) { 434 if (mkdir(to.p_path, 435 curr->fts_statp->st_mode | S_IRWXU) < 0) 436 err(1, "%s", to.p_path); 437 } else if (!S_ISDIR(to_stat.st_mode)) { 438 errno = ENOTDIR; 439 err(1, "%s", to.p_path); 440 } 441 /* 442 * Arrange to correct directory attributes later 443 * (in the post-order phase) if this is a new 444 * directory, or if the -p flag is in effect. 445 */ 446 curr->fts_number = pflag || dne; 447 break; 448 case S_IFBLK: 449 case S_IFCHR: 450 if (Rflag) { 451 if (copy_special(curr->fts_statp, !dne)) 452 badcp = rval = 1; 453 } else { 454 if (copy_file(curr, dne)) 455 badcp = rval = 1; 456 } 457 break; 458 case S_IFSOCK: 459 warnx("%s is a socket (not copied).", 460 curr->fts_path); 461 case S_IFIFO: 462 if (Rflag) { 463 if (copy_fifo(curr->fts_statp, !dne)) 464 badcp = rval = 1; 465 } else { 466 if (copy_file(curr, dne)) 467 badcp = rval = 1; 468 } 469 break; 470 default: 471 if (copy_file(curr, dne)) 472 badcp = rval = 1; 473 break; 474 } 475 if (vflag && !badcp) 476 (void)printf("%s -> %s\n", curr->fts_path, to.p_path); 477 } 478 if (errno) 479 err(1, "fts_read"); 480 fts_close(ftsp); 481 return (rval); 482 } 483 484 /* 485 * mastercmp -- 486 * The comparison function for the copy order. The order is to copy 487 * non-directory files before directory files. The reason for this 488 * is because files tend to be in the same cylinder group as their 489 * parent directory, whereas directories tend not to be. Copying the 490 * files first reduces seeking. 491 */ 492 static int 493 mastercmp(const FTSENT * const *a, const FTSENT * const *b) 494 { 495 int a_info, b_info; 496 497 a_info = (*a)->fts_info; 498 if (a_info == FTS_ERR || a_info == FTS_NS || a_info == FTS_DNR) 499 return (0); 500 b_info = (*b)->fts_info; 501 if (b_info == FTS_ERR || b_info == FTS_NS || b_info == FTS_DNR) 502 return (0); 503 if (a_info == FTS_D) 504 return (-1); 505 if (b_info == FTS_D) 506 return (1); 507 return (0); 508 } 509 510 static void 511 siginfo(int sig __unused) 512 { 513 514 info = 1; 515 } 516