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, sflag, 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 void siginfo(int __unused); 94 95 int 96 main(int argc, char *argv[]) 97 { 98 struct stat to_stat, tmp_stat; 99 enum op type; 100 int Hflag, Lflag, ch, fts_options, r, have_trailing_slash; 101 char *target; 102 103 fts_options = FTS_NOCHDIR | FTS_PHYSICAL; 104 Hflag = Lflag = 0; 105 while ((ch = getopt(argc, argv, "HLPRafilnprsvx")) != -1) 106 switch (ch) { 107 case 'H': 108 Hflag = 1; 109 Lflag = 0; 110 break; 111 case 'L': 112 Lflag = 1; 113 Hflag = 0; 114 break; 115 case 'P': 116 Hflag = Lflag = 0; 117 break; 118 case 'R': 119 Rflag = 1; 120 break; 121 case 'a': 122 pflag = 1; 123 Rflag = 1; 124 Hflag = Lflag = 0; 125 break; 126 case 'f': 127 fflag = 1; 128 iflag = nflag = 0; 129 break; 130 case 'i': 131 iflag = 1; 132 fflag = nflag = 0; 133 break; 134 case 'l': 135 lflag = 1; 136 break; 137 case 'n': 138 nflag = 1; 139 fflag = iflag = 0; 140 break; 141 case 'p': 142 pflag = 1; 143 break; 144 case 'r': 145 rflag = Lflag = 1; 146 Hflag = 0; 147 break; 148 case 's': 149 sflag = 1; 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 (lflag && sflag) 170 errx(1, "the -l and -s options may not be specified together"); 171 if (rflag) 172 Rflag = 1; 173 if (Rflag) { 174 if (Hflag) 175 fts_options |= FTS_COMFOLLOW; 176 if (Lflag) { 177 fts_options &= ~FTS_PHYSICAL; 178 fts_options |= FTS_LOGICAL; 179 } 180 } else { 181 fts_options &= ~FTS_PHYSICAL; 182 fts_options |= FTS_LOGICAL | FTS_COMFOLLOW; 183 } 184 (void)signal(SIGINFO, siginfo); 185 186 /* Save the target base in "to". */ 187 target = argv[--argc]; 188 if (strlcpy(to.p_path, target, sizeof(to.p_path)) >= sizeof(to.p_path)) 189 errx(1, "%s: name too long", target); 190 to.p_end = to.p_path + strlen(to.p_path); 191 if (to.p_path == to.p_end) { 192 *to.p_end++ = '.'; 193 *to.p_end = 0; 194 } 195 have_trailing_slash = (to.p_end[-1] == '/'); 196 if (have_trailing_slash) 197 STRIP_TRAILING_SLASH(to); 198 to.target_end = to.p_end; 199 200 /* Set end of argument list for fts(3). */ 201 argv[argc] = NULL; 202 203 /* 204 * Cp has two distinct cases: 205 * 206 * cp [-R] source target 207 * cp [-R] source1 ... sourceN directory 208 * 209 * In both cases, source can be either a file or a directory. 210 * 211 * In (1), the target becomes a copy of the source. That is, if the 212 * source is a file, the target will be a file, and likewise for 213 * directories. 214 * 215 * In (2), the real target is not directory, but "directory/source". 216 */ 217 r = stat(to.p_path, &to_stat); 218 if (r == -1 && errno != ENOENT) 219 err(1, "%s", to.p_path); 220 if (r == -1 || !S_ISDIR(to_stat.st_mode)) { 221 /* 222 * Case (1). Target is not a directory. 223 */ 224 if (argc > 1) 225 errx(1, "%s is not a directory", to.p_path); 226 227 /* 228 * Need to detect the case: 229 * cp -R dir foo 230 * Where dir is a directory and foo does not exist, where 231 * we want pathname concatenations turned on but not for 232 * the initial mkdir(). 233 */ 234 if (r == -1) { 235 if (Rflag && (Lflag || Hflag)) 236 stat(*argv, &tmp_stat); 237 else 238 lstat(*argv, &tmp_stat); 239 240 if (S_ISDIR(tmp_stat.st_mode) && Rflag) 241 type = DIR_TO_DNE; 242 else 243 type = FILE_TO_FILE; 244 } else 245 type = FILE_TO_FILE; 246 247 if (have_trailing_slash && type == FILE_TO_FILE) { 248 if (r == -1) { 249 errx(1, "directory %s does not exist", 250 to.p_path); 251 } else 252 errx(1, "%s is not a directory", to.p_path); 253 } 254 } else 255 /* 256 * Case (2). Target is a directory. 257 */ 258 type = FILE_TO_DIR; 259 260 exit (copy(argv, type, fts_options)); 261 } 262 263 static int 264 copy(char *argv[], enum op type, int fts_options) 265 { 266 struct stat to_stat; 267 FTS *ftsp; 268 FTSENT *curr; 269 int base = 0, dne, badcp, rval; 270 size_t nlen; 271 char *p, *target_mid; 272 mode_t mask, mode; 273 274 /* 275 * Keep an inverted copy of the umask, for use in correcting 276 * permissions on created directories when not using -p. 277 */ 278 mask = ~umask(0777); 279 umask(~mask); 280 281 if ((ftsp = fts_open(argv, fts_options, NULL)) == NULL) 282 err(1, "fts_open"); 283 for (badcp = rval = 0; (curr = fts_read(ftsp)) != NULL; badcp = 0) { 284 switch (curr->fts_info) { 285 case FTS_NS: 286 case FTS_DNR: 287 case FTS_ERR: 288 warnx("%s: %s", 289 curr->fts_path, strerror(curr->fts_errno)); 290 badcp = rval = 1; 291 continue; 292 case FTS_DC: /* Warn, continue. */ 293 warnx("%s: directory causes a cycle", curr->fts_path); 294 badcp = rval = 1; 295 continue; 296 default: 297 ; 298 } 299 300 /* 301 * If we are in case (2) or (3) above, we need to append the 302 * source name to the target name. 303 */ 304 if (type != FILE_TO_FILE) { 305 /* 306 * Need to remember the roots of traversals to create 307 * correct pathnames. If there's a directory being 308 * copied to a non-existent directory, e.g. 309 * cp -R a/dir noexist 310 * the resulting path name should be noexist/foo, not 311 * noexist/dir/foo (where foo is a file in dir), which 312 * is the case where the target exists. 313 * 314 * Also, check for "..". This is for correct path 315 * concatenation for paths ending in "..", e.g. 316 * cp -R .. /tmp 317 * Paths ending in ".." are changed to ".". This is 318 * tricky, but seems the easiest way to fix the problem. 319 * 320 * XXX 321 * Since the first level MUST be FTS_ROOTLEVEL, base 322 * is always initialized. 323 */ 324 if (curr->fts_level == FTS_ROOTLEVEL) { 325 if (type != DIR_TO_DNE) { 326 p = strrchr(curr->fts_path, '/'); 327 base = (p == NULL) ? 0 : 328 (int)(p - curr->fts_path + 1); 329 330 if (!strcmp(&curr->fts_path[base], 331 "..")) 332 base += 1; 333 } else 334 base = curr->fts_pathlen; 335 } 336 337 p = &curr->fts_path[base]; 338 nlen = curr->fts_pathlen - base; 339 target_mid = to.target_end; 340 if (*p != '/' && target_mid[-1] != '/') 341 *target_mid++ = '/'; 342 *target_mid = 0; 343 if (target_mid - to.p_path + nlen >= PATH_MAX) { 344 warnx("%s%s: name too long (not copied)", 345 to.p_path, p); 346 badcp = rval = 1; 347 continue; 348 } 349 (void)strncat(target_mid, p, nlen); 350 to.p_end = target_mid + nlen; 351 *to.p_end = 0; 352 STRIP_TRAILING_SLASH(to); 353 } 354 355 if (curr->fts_info == FTS_DP) { 356 /* 357 * We are nearly finished with this directory. If we 358 * didn't actually copy it, or otherwise don't need to 359 * change its attributes, then we are done. 360 */ 361 if (!curr->fts_number) 362 continue; 363 /* 364 * If -p is in effect, set all the attributes. 365 * Otherwise, set the correct permissions, limited 366 * by the umask. Optimise by avoiding a chmod() 367 * if possible (which is usually the case if we 368 * made the directory). Note that mkdir() does not 369 * honour setuid, setgid and sticky bits, but we 370 * normally want to preserve them on directories. 371 */ 372 if (pflag) { 373 if (setfile(curr->fts_statp, -1)) 374 rval = 1; 375 if (preserve_dir_acls(curr->fts_statp, 376 curr->fts_accpath, to.p_path) != 0) 377 rval = 1; 378 } else { 379 mode = curr->fts_statp->st_mode; 380 if ((mode & (S_ISUID | S_ISGID | S_ISTXT)) || 381 ((mode | S_IRWXU) & mask) != (mode & mask)) 382 if (chmod(to.p_path, mode & mask) != 383 0) { 384 warn("chmod: %s", to.p_path); 385 rval = 1; 386 } 387 } 388 continue; 389 } 390 391 /* Not an error but need to remember it happened. */ 392 if (stat(to.p_path, &to_stat) == -1) 393 dne = 1; 394 else { 395 if (to_stat.st_dev == curr->fts_statp->st_dev && 396 to_stat.st_ino == curr->fts_statp->st_ino) { 397 warnx("%s and %s are identical (not copied).", 398 to.p_path, curr->fts_path); 399 badcp = rval = 1; 400 if (S_ISDIR(curr->fts_statp->st_mode)) 401 (void)fts_set(ftsp, curr, FTS_SKIP); 402 continue; 403 } 404 if (!S_ISDIR(curr->fts_statp->st_mode) && 405 S_ISDIR(to_stat.st_mode)) { 406 warnx("cannot overwrite directory %s with " 407 "non-directory %s", 408 to.p_path, curr->fts_path); 409 badcp = rval = 1; 410 continue; 411 } 412 dne = 0; 413 } 414 415 switch (curr->fts_statp->st_mode & S_IFMT) { 416 case S_IFLNK: 417 /* Catch special case of a non-dangling symlink. */ 418 if ((fts_options & FTS_LOGICAL) || 419 ((fts_options & FTS_COMFOLLOW) && 420 curr->fts_level == 0)) { 421 if (copy_file(curr, dne)) 422 badcp = rval = 1; 423 } else { 424 if (copy_link(curr, !dne)) 425 badcp = rval = 1; 426 } 427 break; 428 case S_IFDIR: 429 if (!Rflag) { 430 warnx("%s is a directory (not copied).", 431 curr->fts_path); 432 (void)fts_set(ftsp, curr, FTS_SKIP); 433 badcp = rval = 1; 434 break; 435 } 436 /* 437 * If the directory doesn't exist, create the new 438 * one with the from file mode plus owner RWX bits, 439 * modified by the umask. Trade-off between being 440 * able to write the directory (if from directory is 441 * 555) and not causing a permissions race. If the 442 * umask blocks owner writes, we fail. 443 */ 444 if (dne) { 445 if (mkdir(to.p_path, 446 curr->fts_statp->st_mode | S_IRWXU) < 0) 447 err(1, "%s", to.p_path); 448 } else if (!S_ISDIR(to_stat.st_mode)) { 449 errno = ENOTDIR; 450 err(1, "%s", to.p_path); 451 } 452 /* 453 * Arrange to correct directory attributes later 454 * (in the post-order phase) if this is a new 455 * directory, or if the -p flag is in effect. 456 */ 457 curr->fts_number = pflag || dne; 458 break; 459 case S_IFBLK: 460 case S_IFCHR: 461 if (Rflag && !sflag) { 462 if (copy_special(curr->fts_statp, !dne)) 463 badcp = rval = 1; 464 } else { 465 if (copy_file(curr, dne)) 466 badcp = rval = 1; 467 } 468 break; 469 case S_IFSOCK: 470 warnx("%s is a socket (not copied).", 471 curr->fts_path); 472 break; 473 case S_IFIFO: 474 if (Rflag && !sflag) { 475 if (copy_fifo(curr->fts_statp, !dne)) 476 badcp = rval = 1; 477 } else { 478 if (copy_file(curr, dne)) 479 badcp = rval = 1; 480 } 481 break; 482 default: 483 if (copy_file(curr, dne)) 484 badcp = rval = 1; 485 break; 486 } 487 if (vflag && !badcp) 488 (void)printf("%s -> %s\n", curr->fts_path, to.p_path); 489 } 490 if (errno) 491 err(1, "fts_read"); 492 fts_close(ftsp); 493 return (rval); 494 } 495 496 static void 497 siginfo(int sig __unused) 498 { 499 500 info = 1; 501 } 502