1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1988, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * David Hitz of Auspex Systems Inc. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #if 0 36 #ifndef lint 37 static char const copyright[] = 38 "@(#) Copyright (c) 1988, 1993, 1994\n\ 39 The Regents of the University of California. All rights reserved.\n"; 40 #endif /* not lint */ 41 42 #ifndef lint 43 static char sccsid[] = "@(#)cp.c 8.2 (Berkeley) 4/1/94"; 44 #endif /* not lint */ 45 #endif 46 #include <sys/cdefs.h> 47 __FBSDID("$FreeBSD$"); 48 49 /* 50 * Cp copies source files to target files. 51 * 52 * The global PATH_T structure "to" always contains the path to the 53 * current target file. Since fts(3) does not change directories, 54 * this path can be either absolute or dot-relative. 55 * 56 * The basic algorithm is to initialize "to" and use fts(3) to traverse 57 * the file hierarchy rooted in the argument list. A trivial case is the 58 * case of 'cp file1 file2'. The more interesting case is the case of 59 * 'cp file1 file2 ... fileN dir' where the hierarchy is traversed and the 60 * path (relative to the root of the traversal) is appended to dir (stored 61 * in "to") to form the final target path. 62 */ 63 64 #include <sys/types.h> 65 #include <sys/stat.h> 66 67 #include <err.h> 68 #include <errno.h> 69 #include <fts.h> 70 #include <limits.h> 71 #include <signal.h> 72 #include <stdio.h> 73 #include <stdlib.h> 74 #include <string.h> 75 #include <unistd.h> 76 77 #include "extern.h" 78 79 #define STRIP_TRAILING_SLASH(p) { \ 80 while ((p).p_end > (p).p_path + 1 && (p).p_end[-1] == '/') \ 81 *--(p).p_end = 0; \ 82 } 83 84 static char emptystring[] = ""; 85 86 PATH_T to = { to.p_path, emptystring, "" }; 87 88 int fflag, iflag, lflag, nflag, pflag, sflag, vflag; 89 static int Rflag, rflag; 90 volatile sig_atomic_t info; 91 92 enum op { FILE_TO_FILE, FILE_TO_DIR, DIR_TO_DNE }; 93 94 static int copy(char *[], enum op, int); 95 static void siginfo(int __unused); 96 97 int 98 main(int argc, char *argv[]) 99 { 100 struct stat to_stat, tmp_stat; 101 enum op type; 102 int Hflag, Lflag, ch, fts_options, r, have_trailing_slash; 103 char *target; 104 105 fts_options = FTS_NOCHDIR | FTS_PHYSICAL; 106 Hflag = Lflag = 0; 107 while ((ch = getopt(argc, argv, "HLPRafilnprsvx")) != -1) 108 switch (ch) { 109 case 'H': 110 Hflag = 1; 111 Lflag = 0; 112 break; 113 case 'L': 114 Lflag = 1; 115 Hflag = 0; 116 break; 117 case 'P': 118 Hflag = Lflag = 0; 119 break; 120 case 'R': 121 Rflag = 1; 122 break; 123 case 'a': 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 = 0; 149 break; 150 case 's': 151 sflag = 1; 152 break; 153 case 'v': 154 vflag = 1; 155 break; 156 case 'x': 157 fts_options |= FTS_XDEV; 158 break; 159 default: 160 usage(); 161 break; 162 } 163 argc -= optind; 164 argv += optind; 165 166 if (argc < 2) 167 usage(); 168 169 if (Rflag && rflag) 170 errx(1, "the -R and -r options may not be specified together"); 171 if (lflag && sflag) 172 errx(1, "the -l and -s options may not be specified together"); 173 if (rflag) 174 Rflag = 1; 175 if (Rflag) { 176 if (Hflag) 177 fts_options |= FTS_COMFOLLOW; 178 if (Lflag) { 179 fts_options &= ~FTS_PHYSICAL; 180 fts_options |= FTS_LOGICAL; 181 } 182 } else { 183 fts_options &= ~FTS_PHYSICAL; 184 fts_options |= FTS_LOGICAL | FTS_COMFOLLOW; 185 } 186 (void)signal(SIGINFO, siginfo); 187 188 /* Save the target base in "to". */ 189 target = argv[--argc]; 190 if (strlcpy(to.p_path, target, sizeof(to.p_path)) >= sizeof(to.p_path)) 191 errx(1, "%s: name too long", target); 192 to.p_end = to.p_path + strlen(to.p_path); 193 if (to.p_path == to.p_end) { 194 *to.p_end++ = '.'; 195 *to.p_end = 0; 196 } 197 have_trailing_slash = (to.p_end[-1] == '/'); 198 if (have_trailing_slash) 199 STRIP_TRAILING_SLASH(to); 200 to.target_end = to.p_end; 201 202 /* Set end of argument list for fts(3). */ 203 argv[argc] = NULL; 204 205 /* 206 * Cp has two distinct cases: 207 * 208 * cp [-R] source target 209 * cp [-R] source1 ... sourceN directory 210 * 211 * In both cases, source can be either a file or a directory. 212 * 213 * In (1), the target becomes a copy of the source. That is, if the 214 * source is a file, the target will be a file, and likewise for 215 * directories. 216 * 217 * In (2), the real target is not directory, but "directory/source". 218 */ 219 r = stat(to.p_path, &to_stat); 220 if (r == -1 && errno != ENOENT) 221 err(1, "%s", to.p_path); 222 if (r == -1 || !S_ISDIR(to_stat.st_mode)) { 223 /* 224 * Case (1). Target is not a directory. 225 */ 226 if (argc > 1) 227 errx(1, "%s is not a directory", to.p_path); 228 229 /* 230 * Need to detect the case: 231 * cp -R dir foo 232 * Where dir is a directory and foo does not exist, where 233 * we want pathname concatenations turned on but not for 234 * the initial mkdir(). 235 */ 236 if (r == -1) { 237 if (Rflag && (Lflag || Hflag)) 238 stat(*argv, &tmp_stat); 239 else 240 lstat(*argv, &tmp_stat); 241 242 if (S_ISDIR(tmp_stat.st_mode) && Rflag) 243 type = DIR_TO_DNE; 244 else 245 type = FILE_TO_FILE; 246 } else 247 type = FILE_TO_FILE; 248 249 if (have_trailing_slash && type == FILE_TO_FILE) { 250 if (r == -1) { 251 errx(1, "directory %s does not exist", 252 to.p_path); 253 } else 254 errx(1, "%s is not a directory", to.p_path); 255 } 256 } else 257 /* 258 * Case (2). Target is a directory. 259 */ 260 type = FILE_TO_DIR; 261 262 exit (copy(argv, type, fts_options)); 263 } 264 265 static int 266 copy(char *argv[], enum op type, int fts_options) 267 { 268 struct stat to_stat; 269 FTS *ftsp; 270 FTSENT *curr; 271 int base = 0, dne, badcp, rval; 272 size_t nlen; 273 char *p, *target_mid; 274 mode_t mask, mode; 275 276 /* 277 * Keep an inverted copy of the umask, for use in correcting 278 * permissions on created directories when not using -p. 279 */ 280 mask = ~umask(0777); 281 umask(~mask); 282 283 if ((ftsp = fts_open(argv, fts_options, NULL)) == NULL) 284 err(1, "fts_open"); 285 for (badcp = rval = 0; errno = 0, (curr = fts_read(ftsp)) != NULL; 286 badcp = 0) { 287 switch (curr->fts_info) { 288 case FTS_NS: 289 case FTS_DNR: 290 case FTS_ERR: 291 warnx("%s: %s", 292 curr->fts_path, strerror(curr->fts_errno)); 293 badcp = rval = 1; 294 continue; 295 case FTS_DC: /* Warn, continue. */ 296 warnx("%s: directory causes a cycle", curr->fts_path); 297 badcp = rval = 1; 298 continue; 299 default: 300 ; 301 } 302 303 /* 304 * If we are in case (2) or (3) above, we need to append the 305 * source name to the target name. 306 */ 307 if (type != FILE_TO_FILE) { 308 /* 309 * Need to remember the roots of traversals to create 310 * correct pathnames. If there's a directory being 311 * copied to a non-existent directory, e.g. 312 * cp -R a/dir noexist 313 * the resulting path name should be noexist/foo, not 314 * noexist/dir/foo (where foo is a file in dir), which 315 * is the case where the target exists. 316 * 317 * Also, check for "..". This is for correct path 318 * concatenation for paths ending in "..", e.g. 319 * cp -R .. /tmp 320 * Paths ending in ".." are changed to ".". This is 321 * tricky, but seems the easiest way to fix the problem. 322 * 323 * XXX 324 * Since the first level MUST be FTS_ROOTLEVEL, base 325 * is always initialized. 326 */ 327 if (curr->fts_level == FTS_ROOTLEVEL) { 328 if (type != DIR_TO_DNE) { 329 p = strrchr(curr->fts_path, '/'); 330 base = (p == NULL) ? 0 : 331 (int)(p - curr->fts_path + 1); 332 333 if (!strcmp(&curr->fts_path[base], 334 "..")) 335 base += 1; 336 } else 337 base = curr->fts_pathlen; 338 } 339 340 p = &curr->fts_path[base]; 341 nlen = curr->fts_pathlen - base; 342 target_mid = to.target_end; 343 if (*p != '/' && target_mid[-1] != '/') 344 *target_mid++ = '/'; 345 *target_mid = 0; 346 if (target_mid - to.p_path + nlen >= PATH_MAX) { 347 warnx("%s%s: name too long (not copied)", 348 to.p_path, p); 349 badcp = rval = 1; 350 continue; 351 } 352 (void)strncat(target_mid, p, nlen); 353 to.p_end = target_mid + nlen; 354 *to.p_end = 0; 355 STRIP_TRAILING_SLASH(to); 356 } 357 358 if (curr->fts_info == FTS_DP) { 359 /* 360 * We are nearly finished with this directory. If we 361 * didn't actually copy it, or otherwise don't need to 362 * change its attributes, then we are done. 363 */ 364 if (!curr->fts_number) 365 continue; 366 /* 367 * If -p is in effect, set all the attributes. 368 * Otherwise, set the correct permissions, limited 369 * by the umask. Optimise by avoiding a chmod() 370 * if possible (which is usually the case if we 371 * made the directory). Note that mkdir() does not 372 * honour setuid, setgid and sticky bits, but we 373 * normally want to preserve them on directories. 374 */ 375 if (pflag) { 376 if (setfile(curr->fts_statp, -1)) 377 rval = 1; 378 if (preserve_dir_acls(curr->fts_statp, 379 curr->fts_accpath, to.p_path) != 0) 380 rval = 1; 381 } else { 382 mode = curr->fts_statp->st_mode; 383 if ((mode & (S_ISUID | S_ISGID | S_ISTXT)) || 384 ((mode | S_IRWXU) & mask) != (mode & mask)) 385 if (chmod(to.p_path, mode & mask) != 386 0) { 387 warn("chmod: %s", to.p_path); 388 rval = 1; 389 } 390 } 391 continue; 392 } 393 394 /* Not an error but need to remember it happened. */ 395 if (stat(to.p_path, &to_stat) == -1) 396 dne = 1; 397 else { 398 if (to_stat.st_dev == curr->fts_statp->st_dev && 399 to_stat.st_ino == curr->fts_statp->st_ino) { 400 warnx("%s and %s are identical (not copied).", 401 to.p_path, curr->fts_path); 402 badcp = rval = 1; 403 if (S_ISDIR(curr->fts_statp->st_mode)) 404 (void)fts_set(ftsp, curr, FTS_SKIP); 405 continue; 406 } 407 if (!S_ISDIR(curr->fts_statp->st_mode) && 408 S_ISDIR(to_stat.st_mode)) { 409 warnx("cannot overwrite directory %s with " 410 "non-directory %s", 411 to.p_path, curr->fts_path); 412 badcp = rval = 1; 413 continue; 414 } 415 dne = 0; 416 } 417 418 switch (curr->fts_statp->st_mode & S_IFMT) { 419 case S_IFLNK: 420 /* Catch special case of a non-dangling symlink. */ 421 if ((fts_options & FTS_LOGICAL) || 422 ((fts_options & FTS_COMFOLLOW) && 423 curr->fts_level == 0)) { 424 if (copy_file(curr, dne)) 425 badcp = rval = 1; 426 } else { 427 if (copy_link(curr, !dne)) 428 badcp = rval = 1; 429 } 430 break; 431 case S_IFDIR: 432 if (!Rflag) { 433 warnx("%s is a directory (not copied).", 434 curr->fts_path); 435 (void)fts_set(ftsp, curr, FTS_SKIP); 436 badcp = rval = 1; 437 break; 438 } 439 /* 440 * If the directory doesn't exist, create the new 441 * one with the from file mode plus owner RWX bits, 442 * modified by the umask. Trade-off between being 443 * able to write the directory (if from directory is 444 * 555) and not causing a permissions race. If the 445 * umask blocks owner writes, we fail. 446 */ 447 if (dne) { 448 if (mkdir(to.p_path, 449 curr->fts_statp->st_mode | S_IRWXU) < 0) 450 err(1, "%s", to.p_path); 451 } else if (!S_ISDIR(to_stat.st_mode)) { 452 errno = ENOTDIR; 453 err(1, "%s", to.p_path); 454 } 455 /* 456 * Arrange to correct directory attributes later 457 * (in the post-order phase) if this is a new 458 * directory, or if the -p flag is in effect. 459 */ 460 curr->fts_number = pflag || dne; 461 break; 462 case S_IFBLK: 463 case S_IFCHR: 464 if (Rflag && !sflag) { 465 if (copy_special(curr->fts_statp, !dne)) 466 badcp = rval = 1; 467 } else { 468 if (copy_file(curr, dne)) 469 badcp = rval = 1; 470 } 471 break; 472 case S_IFSOCK: 473 warnx("%s is a socket (not copied).", 474 curr->fts_path); 475 break; 476 case S_IFIFO: 477 if (Rflag && !sflag) { 478 if (copy_fifo(curr->fts_statp, !dne)) 479 badcp = rval = 1; 480 } else { 481 if (copy_file(curr, dne)) 482 badcp = rval = 1; 483 } 484 break; 485 default: 486 if (copy_file(curr, dne)) 487 badcp = rval = 1; 488 break; 489 } 490 if (vflag && !badcp) 491 (void)printf("%s -> %s\n", curr->fts_path, to.p_path); 492 } 493 if (errno) 494 err(1, "fts_read"); 495 fts_close(ftsp); 496 return (rval); 497 } 498 499 static void 500 siginfo(int sig __unused) 501 { 502 503 info = 1; 504 } 505