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. 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 /* 34 * Cp copies source files to target files. 35 * 36 * The global PATH_T structure "to" always contains the path to the 37 * current target file. Since fts(3) does not change directories, 38 * this path can be either absolute or dot-relative. 39 * 40 * The basic algorithm is to initialize "to" and use fts(3) to traverse 41 * the file hierarchy rooted in the argument list. A trivial case is the 42 * case of 'cp file1 file2'. The more interesting case is the case of 43 * 'cp file1 file2 ... fileN dir' where the hierarchy is traversed and the 44 * path (relative to the root of the traversal) is appended to dir (stored 45 * in "to") to form the final target path. 46 */ 47 48 #include <sys/types.h> 49 #include <sys/stat.h> 50 51 #include <err.h> 52 #include <errno.h> 53 #include <fts.h> 54 #include <limits.h> 55 #include <signal.h> 56 #include <stdio.h> 57 #include <stdlib.h> 58 #include <string.h> 59 #include <unistd.h> 60 61 #include "extern.h" 62 63 #define STRIP_TRAILING_SLASH(p) { \ 64 while ((p).p_end > (p).p_path + 1 && (p).p_end[-1] == '/') \ 65 *--(p).p_end = 0; \ 66 } 67 68 static char emptystring[] = ""; 69 70 PATH_T to = { to.p_path, emptystring, "" }; 71 72 int fflag, iflag, lflag, nflag, pflag, vflag; 73 static int Rflag, rflag; 74 volatile sig_atomic_t info; 75 76 enum op { FILE_TO_FILE, FILE_TO_DIR, DIR_TO_DNE }; 77 78 static int copy(char *[], enum op, int); 79 static int mastercmp (const FTSENT * const *, const FTSENT * const *); 80 static void siginfo (int); 81 82 int 83 main(int argc, char *argv[]) 84 { 85 struct stat to_stat, tmp_stat; 86 enum op type; 87 int Hflag, Lflag, Pflag, ch, fts_options, r, have_trailing_slash; 88 char *target; 89 90 fts_options = FTS_NOCHDIR | FTS_PHYSICAL; 91 Hflag = Lflag = Pflag = 0; 92 while ((ch = getopt(argc, argv, "HLPRafilnprvx")) != -1) 93 switch (ch) { 94 case 'H': 95 Hflag = 1; 96 Lflag = Pflag = 0; 97 break; 98 case 'L': 99 Lflag = 1; 100 Hflag = Pflag = 0; 101 break; 102 case 'P': 103 Pflag = 1; 104 Hflag = Lflag = 0; 105 break; 106 case 'R': 107 Rflag = 1; 108 break; 109 case 'a': 110 Pflag = 1; 111 pflag = 1; 112 Rflag = 1; 113 Hflag = Lflag = 0; 114 break; 115 case 'f': 116 fflag = 1; 117 iflag = nflag = 0; 118 break; 119 case 'i': 120 iflag = 1; 121 fflag = nflag = 0; 122 break; 123 case 'l': 124 lflag = 1; 125 break; 126 case 'n': 127 nflag = 1; 128 fflag = iflag = 0; 129 break; 130 case 'p': 131 pflag = 1; 132 break; 133 case 'r': 134 rflag = Lflag = 1; 135 Hflag = Pflag = 0; 136 break; 137 case 'v': 138 vflag = 1; 139 break; 140 case 'x': 141 fts_options |= FTS_XDEV; 142 break; 143 default: 144 usage(); 145 break; 146 } 147 argc -= optind; 148 argv += optind; 149 150 if (argc < 2) 151 usage(); 152 153 if (Rflag && rflag) 154 errx(1, "the -R and -r options may not be specified together"); 155 if (rflag) 156 Rflag = 1; 157 if (Rflag) { 158 if (Hflag) 159 fts_options |= FTS_COMFOLLOW; 160 if (Lflag) { 161 fts_options &= ~FTS_PHYSICAL; 162 fts_options |= FTS_LOGICAL; 163 } 164 } else { 165 fts_options &= ~FTS_PHYSICAL; 166 fts_options |= FTS_LOGICAL | FTS_COMFOLLOW; 167 } 168 signal(SIGINFO, siginfo); 169 170 /* Save the target base in "to". */ 171 target = argv[--argc]; 172 if (strlcpy(to.p_path, target, sizeof(to.p_path)) >= sizeof(to.p_path)) 173 errx(1, "%s: name too long", target); 174 to.p_end = to.p_path + strlen(to.p_path); 175 if (to.p_path == to.p_end) { 176 *to.p_end++ = '.'; 177 *to.p_end = 0; 178 } 179 have_trailing_slash = (to.p_end[-1] == '/'); 180 if (have_trailing_slash) 181 STRIP_TRAILING_SLASH(to); 182 to.target_end = to.p_end; 183 184 /* Set end of argument list for fts(3). */ 185 argv[argc] = NULL; 186 187 /* 188 * Cp has two distinct cases: 189 * 190 * cp [-R] source target 191 * cp [-R] source1 ... sourceN directory 192 * 193 * In both cases, source can be either a file or a directory. 194 * 195 * In (1), the target becomes a copy of the source. That is, if the 196 * source is a file, the target will be a file, and likewise for 197 * directories. 198 * 199 * In (2), the real target is not directory, but "directory/source". 200 */ 201 r = stat(to.p_path, &to_stat); 202 if (r == -1 && errno != ENOENT) 203 err(1, "%s", to.p_path); 204 if (r == -1 || !S_ISDIR(to_stat.st_mode)) { 205 /* 206 * Case (1). Target is not a directory. 207 */ 208 if (argc > 1) 209 errx(1, "%s is not a directory", to.p_path); 210 211 /* 212 * Need to detect the case: 213 * cp -R dir foo 214 * Where dir is a directory and foo does not exist, where 215 * we want pathname concatenations turned on but not for 216 * the initial mkdir(). 217 */ 218 if (r == -1) { 219 if (Rflag && (Lflag || Hflag)) 220 stat(*argv, &tmp_stat); 221 else 222 lstat(*argv, &tmp_stat); 223 224 if (S_ISDIR(tmp_stat.st_mode) && Rflag) 225 type = DIR_TO_DNE; 226 else 227 type = FILE_TO_FILE; 228 } else 229 type = FILE_TO_FILE; 230 231 if (have_trailing_slash && type == FILE_TO_FILE) { 232 if (r == -1) 233 errx(1, "directory %s does not exist", 234 to.p_path); 235 else 236 errx(1, "%s is not a directory", to.p_path); 237 } 238 } else 239 /* 240 * Case (2). Target is a directory. 241 */ 242 type = FILE_TO_DIR; 243 244 exit (copy(argv, type, fts_options)); 245 } 246 247 static int 248 copy(char *argv[], enum op type, int fts_options) 249 { 250 struct stat to_stat; 251 FTS *ftsp; 252 FTSENT *curr; 253 int base = 0, dne, badcp, rval; 254 size_t nlen; 255 char *p, *target_mid; 256 mode_t mask, mode; 257 258 /* 259 * Keep an inverted copy of the umask, for use in correcting 260 * permissions on created directories when not using -p. 261 */ 262 mask = ~umask(0777); 263 umask(~mask); 264 265 if ((ftsp = fts_open(argv, fts_options, mastercmp)) == NULL) 266 err(1, "fts_open"); 267 for (badcp = rval = 0; (curr = fts_read(ftsp)) != NULL; badcp = 0) { 268 switch (curr->fts_info) { 269 case FTS_NS: 270 case FTS_DNR: 271 case FTS_ERR: 272 warnx("%s: %s", 273 curr->fts_path, strerror(curr->fts_errno)); 274 rval = 1; 275 continue; 276 case FTS_DC: /* Warn, continue. */ 277 warnx("%s: directory causes a cycle", curr->fts_path); 278 rval = 1; 279 continue; 280 default: 281 ; 282 } 283 284 /* 285 * If we are in case (2) or (3) above, we need to append the 286 * source name to the target name. 287 */ 288 if (type != FILE_TO_FILE) { 289 /* 290 * Need to remember the roots of traversals to create 291 * correct pathnames. If there's a directory being 292 * copied to a non-existent directory, e.g. 293 * cp -R a/dir noexist 294 * the resulting path name should be noexist/foo, not 295 * noexist/dir/foo (where foo is a file in dir), which 296 * is the case where the target exists. 297 * 298 * Also, check for "..". This is for correct path 299 * concatenation for paths ending in "..", e.g. 300 * cp -R .. /tmp 301 * Paths ending in ".." are changed to ".". This is 302 * tricky, but seems the easiest way to fix the problem. 303 * 304 * XXX 305 * Since the first level MUST be FTS_ROOTLEVEL, base 306 * is always initialized. 307 */ 308 if (curr->fts_level == FTS_ROOTLEVEL) { 309 if (type != DIR_TO_DNE) { 310 p = strrchr(curr->fts_path, '/'); 311 base = (p == NULL) ? 0 : 312 (int)(p - curr->fts_path + 1); 313 314 if (!strcmp(&curr->fts_path[base], 315 "..")) 316 base += 1; 317 } else 318 base = curr->fts_pathlen; 319 } 320 321 p = &curr->fts_path[base]; 322 nlen = curr->fts_pathlen - base; 323 target_mid = to.target_end; 324 if (*p != '/' && target_mid[-1] != '/') 325 *target_mid++ = '/'; 326 *target_mid = 0; 327 if (target_mid - to.p_path + nlen >= PATH_MAX) { 328 warnx("%s%s: name too long (not copied)", 329 to.p_path, p); 330 rval = 1; 331 continue; 332 } 333 strncat(target_mid, p, nlen); 334 to.p_end = target_mid + nlen; 335 *to.p_end = 0; 336 STRIP_TRAILING_SLASH(to); 337 } 338 339 if (curr->fts_info == FTS_DP) { 340 /* 341 * We are nearly finished with this directory. If we 342 * didn't actually copy it, or otherwise don't need to 343 * change its attributes, then we are done. 344 */ 345 if (!curr->fts_number) 346 continue; 347 /* 348 * If -p is in effect, set all the attributes. 349 * Otherwise, set the correct permissions, limited 350 * by the umask. Optimise by avoiding a chmod() 351 * if possible (which is usually the case if we 352 * made the directory). Note that mkdir() does not 353 * honour setuid, setgid and sticky bits, but we 354 * normally want to preserve them on directories. 355 */ 356 if (pflag) { 357 if (setfile(curr->fts_statp, -1)) 358 rval = 1; 359 } else { 360 mode = curr->fts_statp->st_mode; 361 if ((mode & (S_ISUID | S_ISGID | S_ISTXT)) || 362 ((mode | S_IRWXU) & mask) != (mode & mask)) 363 if (chmod(to.p_path, mode & mask) != 0){ 364 warn("chmod: %s", to.p_path); 365 rval = 1; 366 } 367 } 368 continue; 369 } 370 371 /* Not an error but need to remember it happened */ 372 if (stat(to.p_path, &to_stat) == -1) 373 dne = 1; 374 else { 375 if (to_stat.st_dev == curr->fts_statp->st_dev && 376 to_stat.st_ino == curr->fts_statp->st_ino) { 377 warnx("%s and %s are identical (not copied).", 378 to.p_path, curr->fts_path); 379 rval = 1; 380 if (S_ISDIR(curr->fts_statp->st_mode)) 381 fts_set(ftsp, curr, FTS_SKIP); 382 continue; 383 } 384 if (!S_ISDIR(curr->fts_statp->st_mode) && 385 S_ISDIR(to_stat.st_mode)) { 386 warnx("cannot overwrite directory %s with " 387 "non-directory %s", 388 to.p_path, curr->fts_path); 389 rval = 1; 390 continue; 391 } 392 dne = 0; 393 } 394 395 switch (curr->fts_statp->st_mode & S_IFMT) { 396 case S_IFLNK: 397 /* Catch special case of a non-dangling symlink */ 398 if ((fts_options & FTS_LOGICAL) || 399 ((fts_options & FTS_COMFOLLOW) && 400 curr->fts_level == 0)) { 401 if (copy_file(curr, dne)) 402 badcp = rval = 1; 403 } else { 404 if (copy_link(curr, !dne)) 405 badcp = rval = 1; 406 } 407 break; 408 case S_IFDIR: 409 if (!Rflag) { 410 warnx("%s is a directory (not copied).", 411 curr->fts_path); 412 fts_set(ftsp, curr, FTS_SKIP); 413 badcp = rval = 1; 414 break; 415 } 416 /* 417 * If the directory doesn't exist, create the new 418 * one with the from file mode plus owner RWX bits, 419 * modified by the umask. Trade-off between being 420 * able to write the directory (if from directory is 421 * 555) and not causing a permissions race. If the 422 * umask blocks owner writes, we fail.. 423 */ 424 if (dne) { 425 if (mkdir(to.p_path, 426 curr->fts_statp->st_mode | S_IRWXU) < 0) 427 err(1, "%s", to.p_path); 428 } else if (!S_ISDIR(to_stat.st_mode)) { 429 errno = ENOTDIR; 430 err(1, "%s", to.p_path); 431 } 432 /* 433 * Arrange to correct directory attributes later 434 * (in the post-order phase) if this is a new 435 * directory, or if the -p flag is in effect. 436 */ 437 curr->fts_number = pflag || dne; 438 break; 439 case S_IFBLK: 440 case S_IFCHR: 441 if (Rflag) { 442 if (copy_special(curr->fts_statp, !dne)) 443 badcp = rval = 1; 444 } else { 445 if (copy_file(curr, dne)) 446 badcp = rval = 1; 447 } 448 break; 449 case S_IFSOCK: 450 warnx("%s is a socket (not copied).", 451 curr->fts_path); 452 break; 453 case S_IFIFO: 454 if (Rflag) { 455 if (copy_fifo(curr->fts_statp, !dne)) 456 badcp = rval = 1; 457 } else { 458 if (copy_file(curr, dne)) 459 badcp = rval = 1; 460 } 461 break; 462 default: 463 if (copy_file(curr, dne)) 464 badcp = rval = 1; 465 break; 466 } 467 if (vflag && !badcp) 468 printf("%s -> %s\n", curr->fts_path, to.p_path); 469 } 470 if (errno) 471 err(1, "fts_read"); 472 fts_close(ftsp); 473 return (rval); 474 } 475 476 /* 477 * mastercmp -- 478 * The comparison function for the copy order. The order is to copy 479 * non-directory files before directory files. The reason for this 480 * is because files tend to be in the same cylinder group as their 481 * parent directory, whereas directories tend not to be. Copying the 482 * files first reduces seeking. 483 */ 484 static int 485 mastercmp(const FTSENT * const *a, const FTSENT * const *b) 486 { 487 int a_info, b_info; 488 489 a_info = (*a)->fts_info; 490 if (a_info == FTS_ERR || a_info == FTS_NS || a_info == FTS_DNR) 491 return (0); 492 b_info = (*b)->fts_info; 493 if (b_info == FTS_ERR || b_info == FTS_NS || b_info == FTS_DNR) 494 return (0); 495 if (a_info == FTS_D) 496 return (-1); 497 if (b_info == FTS_D) 498 return (1); 499 return (0); 500 } 501 502 static void 503 siginfo(int sig __unused) 504 { 505 506 info = 1; 507 } 508