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 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37 #if 0 38 #ifndef lint 39 static char const copyright[] = 40 "@(#) Copyright (c) 1988, 1993, 1994\n\ 41 The Regents of the University of California. All rights reserved.\n"; 42 #endif /* not lint */ 43 44 #ifndef lint 45 static char sccsid[] = "@(#)cp.c 8.2 (Berkeley) 4/1/94"; 46 #endif /* not lint */ 47 #endif 48 #include <sys/cdefs.h> 49 __FBSDID("$FreeBSD$"); 50 51 /* 52 * Cp copies source files to target files. 53 * 54 * The global PATH_T structure "to" always contains the path to the 55 * current target file. Since fts(3) does not change directories, 56 * this path can be either absolute or dot-relative. 57 * 58 * The basic algorithm is to initialize "to" and use fts(3) to traverse 59 * the file hierarchy rooted in the argument list. A trivial case is the 60 * case of 'cp file1 file2'. The more interesting case is the case of 61 * 'cp file1 file2 ... fileN dir' where the hierarchy is traversed and the 62 * path (relative to the root of the traversal) is appended to dir (stored 63 * in "to") to form the final target path. 64 */ 65 66 #include <sys/types.h> 67 #include <sys/stat.h> 68 69 #include <err.h> 70 #include <errno.h> 71 #include <fts.h> 72 #include <limits.h> 73 #include <signal.h> 74 #include <stdio.h> 75 #include <stdlib.h> 76 #include <string.h> 77 #include <unistd.h> 78 79 #include "extern.h" 80 81 #define STRIP_TRAILING_SLASH(p) { \ 82 while ((p).p_end > (p).p_path + 1 && (p).p_end[-1] == '/') \ 83 *--(p).p_end = 0; \ 84 } 85 86 static char emptystring[] = ""; 87 88 PATH_T to = { to.p_path, emptystring, "" }; 89 90 int fflag, iflag, nflag, pflag, vflag; 91 static int Rflag, rflag; 92 volatile sig_atomic_t info; 93 94 enum op { FILE_TO_FILE, FILE_TO_DIR, DIR_TO_DNE }; 95 96 static int copy(char *[], enum op, int); 97 static int mastercmp(const FTSENT * const *, const FTSENT * const *); 98 static void siginfo(int __unused); 99 100 int 101 main(int argc, char *argv[]) 102 { 103 struct stat to_stat, tmp_stat; 104 enum op type; 105 int Hflag, Lflag, Pflag, ch, fts_options, r, have_trailing_slash; 106 char *target; 107 108 Hflag = Lflag = Pflag = 0; 109 while ((ch = getopt(argc, argv, "HLPRfinprv")) != -1) 110 switch (ch) { 111 case 'H': 112 Hflag = 1; 113 Lflag = Pflag = 0; 114 break; 115 case 'L': 116 Lflag = 1; 117 Hflag = Pflag = 0; 118 break; 119 case 'P': 120 Pflag = 1; 121 Hflag = Lflag = 0; 122 break; 123 case 'R': 124 Rflag = 1; 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 'n': 135 nflag = 1; 136 fflag = iflag = 0; 137 break; 138 case 'p': 139 pflag = 1; 140 break; 141 case 'r': 142 rflag = 1; 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) { 159 if (Rflag) 160 errx(1, 161 "the -R and -r options may not be specified together."); 162 if (Hflag || Lflag || Pflag) 163 errx(1, 164 "the -H, -L, and -P options may not be specified with the -r option."); 165 fts_options &= ~FTS_PHYSICAL; 166 fts_options |= FTS_LOGICAL; 167 } 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 usage(); 221 exit(1); 222 } 223 /* 224 * Need to detect the case: 225 * cp -R dir foo 226 * Where dir is a directory and foo does not exist, where 227 * we want pathname concatenations turned on but not for 228 * the initial mkdir(). 229 */ 230 if (r == -1) { 231 if (rflag || (Rflag && (Lflag || Hflag))) 232 stat(*argv, &tmp_stat); 233 else 234 lstat(*argv, &tmp_stat); 235 236 if (S_ISDIR(tmp_stat.st_mode) && (Rflag || rflag)) 237 type = DIR_TO_DNE; 238 else 239 type = FILE_TO_FILE; 240 } else 241 type = FILE_TO_FILE; 242 243 if (have_trailing_slash && type == FILE_TO_FILE) { 244 if (r == -1) 245 errx(1, "directory %s does not exist", 246 to.p_path); 247 else 248 errx(1, "%s is not a directory", to.p_path); 249 } 250 } else 251 /* 252 * Case (2). Target is a directory. 253 */ 254 type = FILE_TO_DIR; 255 256 exit (copy(argv, type, fts_options)); 257 } 258 259 static int 260 copy(char *argv[], enum op type, int fts_options) 261 { 262 struct stat to_stat; 263 FTS *ftsp; 264 FTSENT *curr; 265 int base = 0, dne, badcp, rval; 266 size_t nlen; 267 char *p, *target_mid; 268 mode_t mask, mode; 269 270 /* 271 * Keep an inverted copy of the umask, for use in correcting 272 * permissions on created directories when not using -p. 273 */ 274 mask = ~umask(0777); 275 umask(~mask); 276 277 if ((ftsp = fts_open(argv, fts_options, mastercmp)) == NULL) 278 err(1, "fts_open"); 279 for (badcp = rval = 0; (curr = fts_read(ftsp)) != NULL; badcp = 0) { 280 switch (curr->fts_info) { 281 case FTS_NS: 282 case FTS_DNR: 283 case FTS_ERR: 284 warnx("%s: %s", 285 curr->fts_path, strerror(curr->fts_errno)); 286 badcp = rval = 1; 287 continue; 288 case FTS_DC: /* Warn, continue. */ 289 warnx("%s: directory causes a cycle", curr->fts_path); 290 badcp = rval = 1; 291 continue; 292 default: 293 ; 294 } 295 296 /* 297 * If we are in case (2) or (3) above, we need to append the 298 * source name to the target name. 299 */ 300 if (type != FILE_TO_FILE) { 301 /* 302 * Need to remember the roots of traversals to create 303 * correct pathnames. If there's a directory being 304 * copied to a non-existent directory, e.g. 305 * cp -R a/dir noexist 306 * the resulting path name should be noexist/foo, not 307 * noexist/dir/foo (where foo is a file in dir), which 308 * is the case where the target exists. 309 * 310 * Also, check for "..". This is for correct path 311 * concatenation for paths ending in "..", e.g. 312 * cp -R .. /tmp 313 * Paths ending in ".." are changed to ".". This is 314 * tricky, but seems the easiest way to fix the problem. 315 * 316 * XXX 317 * Since the first level MUST be FTS_ROOTLEVEL, base 318 * is always initialized. 319 */ 320 if (curr->fts_level == FTS_ROOTLEVEL) { 321 if (type != DIR_TO_DNE) { 322 p = strrchr(curr->fts_path, '/'); 323 base = (p == NULL) ? 0 : 324 (int)(p - curr->fts_path + 1); 325 326 if (!strcmp(&curr->fts_path[base], 327 "..")) 328 base += 1; 329 } else 330 base = curr->fts_pathlen; 331 } 332 333 p = &curr->fts_path[base]; 334 nlen = curr->fts_pathlen - base; 335 target_mid = to.target_end; 336 if (*p != '/' && target_mid[-1] != '/') 337 *target_mid++ = '/'; 338 *target_mid = 0; 339 if (target_mid - to.p_path + nlen >= PATH_MAX) { 340 warnx("%s%s: name too long (not copied)", 341 to.p_path, p); 342 badcp = rval = 1; 343 continue; 344 } 345 (void)strncat(target_mid, p, nlen); 346 to.p_end = target_mid + nlen; 347 *to.p_end = 0; 348 STRIP_TRAILING_SLASH(to); 349 } 350 351 if (curr->fts_info == FTS_DP) { 352 /* 353 * We are nearly finished with this directory. If we 354 * didn't actually copy it, or otherwise don't need to 355 * change its attributes, then we are done. 356 */ 357 if (!curr->fts_number) 358 continue; 359 /* 360 * If -p is in effect, set all the attributes. 361 * Otherwise, set the correct permissions, limited 362 * by the umask. Optimise by avoiding a chmod() 363 * if possible (which is usually the case if we 364 * made the directory). Note that mkdir() does not 365 * honour setuid, setgid and sticky bits, but we 366 * normally want to preserve them on directories. 367 */ 368 if (pflag) { 369 if (setfile(curr->fts_statp, -1)) 370 rval = 1; 371 } else { 372 mode = curr->fts_statp->st_mode; 373 if ((mode & (S_ISUID | S_ISGID | S_ISTXT)) || 374 ((mode | S_IRWXU) & mask) != (mode & mask)) 375 if (chmod(to.p_path, mode & mask) != 0){ 376 warn("chmod: %s", to.p_path); 377 rval = 1; 378 } 379 } 380 continue; 381 } 382 383 /* Not an error but need to remember it happened */ 384 if (stat(to.p_path, &to_stat) == -1) 385 dne = 1; 386 else { 387 if (to_stat.st_dev == curr->fts_statp->st_dev && 388 to_stat.st_ino == curr->fts_statp->st_ino) { 389 warnx("%s and %s are identical (not copied).", 390 to.p_path, curr->fts_path); 391 badcp = rval = 1; 392 if (S_ISDIR(curr->fts_statp->st_mode)) 393 (void)fts_set(ftsp, curr, FTS_SKIP); 394 continue; 395 } 396 if (!S_ISDIR(curr->fts_statp->st_mode) && 397 S_ISDIR(to_stat.st_mode)) { 398 warnx("cannot overwrite directory %s with " 399 "non-directory %s", 400 to.p_path, curr->fts_path); 401 badcp = rval = 1; 402 continue; 403 } 404 dne = 0; 405 } 406 407 switch (curr->fts_statp->st_mode & S_IFMT) { 408 case S_IFLNK: 409 /* Catch special case of a non-dangling symlink */ 410 if ((fts_options & FTS_LOGICAL) || 411 ((fts_options & FTS_COMFOLLOW) && 412 curr->fts_level == 0)) { 413 if (copy_file(curr, dne)) 414 badcp = rval = 1; 415 } else { 416 if (copy_link(curr, !dne)) 417 badcp = rval = 1; 418 } 419 break; 420 case S_IFDIR: 421 if (!Rflag && !rflag) { 422 warnx("%s is a directory (not copied).", 423 curr->fts_path); 424 (void)fts_set(ftsp, curr, FTS_SKIP); 425 badcp = rval = 1; 426 break; 427 } 428 /* 429 * If the directory doesn't exist, create the new 430 * one with the from file mode plus owner RWX bits, 431 * modified by the umask. Trade-off between being 432 * able to write the directory (if from directory is 433 * 555) and not causing a permissions race. If the 434 * umask blocks owner writes, we fail.. 435 */ 436 if (dne) { 437 if (mkdir(to.p_path, 438 curr->fts_statp->st_mode | S_IRWXU) < 0) 439 err(1, "%s", to.p_path); 440 } else if (!S_ISDIR(to_stat.st_mode)) { 441 errno = ENOTDIR; 442 err(1, "%s", to.p_path); 443 } 444 /* 445 * Arrange to correct directory attributes later 446 * (in the post-order phase) if this is a new 447 * directory, or if the -p flag is in effect. 448 */ 449 curr->fts_number = pflag || dne; 450 break; 451 case S_IFBLK: 452 case S_IFCHR: 453 if (Rflag) { 454 if (copy_special(curr->fts_statp, !dne)) 455 badcp = rval = 1; 456 } else { 457 if (copy_file(curr, dne)) 458 badcp = rval = 1; 459 } 460 break; 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 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