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 * @(#) Copyright (c) 1988, 1993, 1994 The Regents of the University of California. All rights reserved. 37 * @(#)cp.c 8.2 (Berkeley) 4/1/94 38 * $FreeBSD: src/bin/cp/cp.c,v 1.51 2005/01/10 08:39:21 imp Exp $ $ 39 * $DragonFly: src/bin/cp/cp.c,v 1.12 2006/06/19 12:07:50 corecode Exp $ 40 */ 41 42 /* 43 * Cp copies source files to target files. 44 * 45 * The global PATH_T structure "to" always contains the path to the 46 * current target file. Since fts(3) does not change directories, 47 * this path can be either absolute or dot-relative. 48 * 49 * The basic algorithm is to initialize "to" and use fts(3) to traverse 50 * the file hierarchy rooted in the argument list. A trivial case is the 51 * case of 'cp file1 file2'. The more interesting case is the case of 52 * 'cp file1 file2 ... fileN dir' where the hierarchy is traversed and the 53 * path (relative to the root of the traversal) is appended to dir (stored 54 * in "to") to form the final target path. 55 */ 56 57 #include <sys/types.h> 58 #include <sys/stat.h> 59 60 #include <err.h> 61 #include <errno.h> 62 #include <fts.h> 63 #include <limits.h> 64 #include <signal.h> 65 #include <stdio.h> 66 #include <stdlib.h> 67 #include <string.h> 68 #include <unistd.h> 69 70 #include "extern.h" 71 72 #define STRIP_TRAILING_SLASH(p) { \ 73 while ((p).p_end > (p).p_path + 1 && (p).p_end[-1] == '/') \ 74 *--(p).p_end = 0; \ 75 } 76 77 PATH_T to = { to.p_path, to.p_path, "" }; 78 79 int fflag, iflag, nflag, pflag, vflag; 80 static int Rflag, rflag; 81 volatile sig_atomic_t info; 82 83 enum op { FILE_TO_FILE, FILE_TO_DIR, DIR_TO_DNE }; 84 85 static int copy (char **, enum op, int); 86 static int mastercmp (const FTSENT **, const FTSENT **); 87 static void siginfo (int); 88 89 int 90 main(int argc, char **argv) 91 { 92 struct stat to_stat, tmp_stat; 93 enum op type; 94 int Hflag, Lflag, Pflag, ch, has_trailing_slash, r, fts_options; 95 char *target; 96 97 Hflag = Lflag = Pflag = 0; 98 while ((ch = getopt(argc, argv, "HLPRfinprv")) != -1) 99 switch (ch) { 100 case 'H': 101 Hflag = 1; 102 Lflag = Pflag = 0; 103 break; 104 case 'L': 105 Lflag = 1; 106 Hflag = Pflag = 0; 107 break; 108 case 'P': 109 Pflag = 1; 110 Hflag = Lflag = 0; 111 break; 112 case 'R': 113 Rflag = 1; 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 'n': 124 nflag = 1; 125 fflag = iflag = 0; 126 break; 127 case 'p': 128 pflag = 1; 129 break; 130 case 'r': 131 rflag = 1; 132 break; 133 case 'v': 134 vflag = 1; 135 break; 136 default: 137 usage(); 138 break; 139 } 140 argc -= optind; 141 argv += optind; 142 143 if (argc < 2) 144 usage(); 145 146 fts_options = FTS_NOCHDIR | FTS_PHYSICAL; 147 if (rflag) { 148 if (Rflag) 149 errx(1, 150 "the -R and -r options may not be specified together."); 151 if (Hflag || Lflag || Pflag) 152 errx(1, 153 "the -H, -L, and -P options may not be specified with the -r option."); 154 fts_options &= ~FTS_PHYSICAL; 155 fts_options |= FTS_LOGICAL; 156 } 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 has_trailing_slash = (to.p_end[-1] == '/'); 180 if (has_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 usage(); 210 exit(1); 211 } 212 /* 213 * Need to detect the case: 214 * cp -R dir foo 215 * Where dir is a directory and foo does not exist, where 216 * we want pathname concatenations turned on but not for 217 * the initial mkdir(). 218 */ 219 if (r == -1) { 220 if (rflag || (Rflag && (Lflag || Hflag))) 221 stat(*argv, &tmp_stat); 222 else 223 lstat(*argv, &tmp_stat); 224 225 if (S_ISDIR(tmp_stat.st_mode) && (Rflag || rflag)) 226 type = DIR_TO_DNE; 227 else 228 type = FILE_TO_FILE; 229 } else 230 type = FILE_TO_FILE; 231 232 if (has_trailing_slash && type == FILE_TO_FILE) { 233 if (r == -1) 234 errx(1, "directory %s does not exist", 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, dne, badcp, nlen, rval; 254 char *p, *target_mid; 255 mode_t mask, mode; 256 257 /* 258 * Keep an inverted copy of the umask, for use in correcting 259 * permissions on created directories when not using -p. 260 */ 261 mask = ~umask(0777); 262 umask(~mask); 263 base = 0; 264 265 if ((ftsp = fts_open(argv, fts_options, mastercmp)) == NULL) 266 err(1, NULL); 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 badcp = rval = 1; 275 continue; 276 case FTS_DC: /* Warn, continue. */ 277 warnx("%s: directory causes a cycle", curr->fts_path); 278 badcp = rval = 1; 279 continue; 280 } 281 282 /* 283 * If we are in case (2) or (3) above, we need to append the 284 * source name to the target name. 285 */ 286 if (type != FILE_TO_FILE) { 287 /* 288 * Need to remember the roots of traversals to create 289 * correct pathnames. If there's a directory being 290 * copied to a non-existent directory, e.g. 291 * cp -R a/dir noexist 292 * the resulting path name should be noexist/foo, not 293 * noexist/dir/foo (where foo is a file in dir), which 294 * is the case where the target exists. 295 * 296 * Also, check for "..". This is for correct path 297 * concatenation for paths ending in "..", e.g. 298 * cp -R .. /tmp 299 * Paths ending in ".." are changed to ".". This is 300 * tricky, but seems the easiest way to fix the problem. 301 * 302 * XXX 303 * Since the first level MUST be FTS_ROOTLEVEL, base 304 * is always initialized. 305 */ 306 if (curr->fts_level == FTS_ROOTLEVEL) { 307 if (type != DIR_TO_DNE) { 308 p = strrchr(curr->fts_path, '/'); 309 base = (p == NULL) ? 0 : 310 (int)(p - curr->fts_path + 1); 311 312 if (!strcmp(&curr->fts_path[base], 313 "..")) 314 base += 1; 315 } else 316 base = curr->fts_pathlen; 317 } 318 319 p = &curr->fts_path[base]; 320 nlen = curr->fts_pathlen - base; 321 target_mid = to.target_end; 322 if (*p != '/' && target_mid[-1] != '/') 323 *target_mid++ = '/'; 324 *target_mid = 0; 325 if (target_mid - to.p_path + nlen >= PATH_MAX) { 326 warnx("%s%s: name too long (not copied)", 327 to.p_path, p); 328 badcp = rval = 1; 329 continue; 330 } 331 strncat(target_mid, p, nlen); 332 to.p_end = target_mid + nlen; 333 *to.p_end = 0; 334 STRIP_TRAILING_SLASH(to); 335 } 336 337 if (curr->fts_info == FTS_DP) { 338 /* 339 * We are nearly finished with this directory. If we 340 * didn't actually copy it, or otherwise don't need to 341 * change its attributes, then we are done. 342 */ 343 if (!curr->fts_number) 344 continue; 345 /* 346 * If -p is in effect, set all the attributes. 347 * Otherwise, set the correct permissions, limited 348 * by the umask. Optimise by avoiding a chmod() 349 * if possible (which is usually the case if we 350 * made the directory). Note that mkdir() does not 351 * honour setuid, setgid and sticky bits, but we 352 * normally want to preserve them on directories. 353 */ 354 if (pflag) { 355 if (setfile(curr->fts_statp, -1)) 356 rval = 1; 357 } else { 358 mode = curr->fts_statp->st_mode; 359 if ((mode & (S_ISUID | S_ISGID | S_ISTXT)) || 360 ((mode | S_IRWXU) & mask) != (mode & mask)) 361 if (chmod(to.p_path, mode & mask) != 0){ 362 warn("chmod: %s", to.p_path); 363 rval = 1; 364 } 365 } 366 continue; 367 } 368 369 /* Not an error but need to remember it happened */ 370 if (stat(to.p_path, &to_stat) == -1) 371 dne = 1; 372 else { 373 if (to_stat.st_dev == curr->fts_statp->st_dev && 374 to_stat.st_ino == curr->fts_statp->st_ino) { 375 warnx("%s and %s are identical (not copied).", 376 to.p_path, curr->fts_path); 377 badcp = rval = 1; 378 if (S_ISDIR(curr->fts_statp->st_mode)) 379 fts_set(ftsp, curr, FTS_SKIP); 380 continue; 381 } 382 if (!S_ISDIR(curr->fts_statp->st_mode) && 383 S_ISDIR(to_stat.st_mode)) { 384 warnx("cannot overwrite directory %s with non-directory %s", 385 to.p_path, curr->fts_path); 386 badcp = rval = 1; 387 continue; 388 } 389 dne = 0; 390 } 391 392 switch (curr->fts_statp->st_mode & S_IFMT) { 393 case S_IFLNK: 394 /* Catch special case of a non-dangling symlink */ 395 if ((fts_options & FTS_LOGICAL) || 396 ((fts_options & FTS_COMFOLLOW) && 397 curr->fts_level == 0)) { 398 if (copy_file(curr, dne)) 399 badcp = rval = 1; 400 } else { 401 if (copy_link(curr, !dne)) 402 badcp = rval = 1; 403 } 404 break; 405 case S_IFDIR: 406 if (!Rflag && !rflag) { 407 warnx("%s is a directory (not copied).", 408 curr->fts_path); 409 fts_set(ftsp, curr, FTS_SKIP); 410 badcp = rval = 1; 411 break; 412 } 413 /* 414 * If the directory doesn't exist, create the new 415 * one with the from file mode plus owner RWX bits, 416 * modified by the umask. Trade-off between being 417 * able to write the directory (if from directory is 418 * 555) and not causing a permissions race. If the 419 * umask blocks owner writes, we fail.. 420 */ 421 if (dne) { 422 if (mkdir(to.p_path, 423 curr->fts_statp->st_mode | S_IRWXU) < 0) 424 err(1, "%s", to.p_path); 425 } else if (!S_ISDIR(to_stat.st_mode)) { 426 errno = ENOTDIR; 427 err(1, "%s", to.p_path); 428 } 429 /* 430 * Arrange to correct directory attributes later 431 * (in the post-order phase) if this is a new 432 * directory, or if the -p flag is in effect. 433 */ 434 curr->fts_number = pflag || dne; 435 break; 436 case S_IFBLK: 437 case S_IFCHR: 438 if (Rflag) { 439 if (copy_special(curr->fts_statp, !dne)) 440 badcp = rval = 1; 441 } else { 442 if (copy_file(curr, dne)) 443 badcp = rval = 1; 444 } 445 break; 446 case S_IFIFO: 447 if (Rflag) { 448 if (copy_fifo(curr->fts_statp, !dne)) 449 badcp = rval = 1; 450 } else { 451 if (copy_file(curr, dne)) 452 badcp = rval = 1; 453 } 454 break; 455 default: 456 if (copy_file(curr, dne)) 457 badcp = rval = 1; 458 break; 459 } 460 if (vflag && !badcp) 461 printf("%s -> %s\n", curr->fts_path, to.p_path); 462 } 463 if (errno) 464 err(1, "fts_read"); 465 fts_close(ftsp); 466 return (rval); 467 } 468 469 /* 470 * mastercmp -- 471 * The comparison function for the copy order. The order is to copy 472 * non-directory files before directory files. The reason for this 473 * is because files tend to be in the same cylinder group as their 474 * parent directory, whereas directories tend not to be. Copying the 475 * files first reduces seeking. 476 */ 477 static int 478 mastercmp(const FTSENT **a, const FTSENT **b) 479 { 480 int a_info, b_info; 481 482 a_info = (*a)->fts_info; 483 if (a_info == FTS_ERR || a_info == FTS_NS || a_info == FTS_DNR) 484 return (0); 485 b_info = (*b)->fts_info; 486 if (b_info == FTS_ERR || b_info == FTS_NS || b_info == FTS_DNR) 487 return (0); 488 if (a_info == FTS_D) 489 return (-1); 490 if (b_info == FTS_D) 491 return (1); 492 return (0); 493 } 494 495 static void 496 siginfo(int notused __unused) 497 { 498 499 info = 1; 500 } 501