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 1.24.2.7 2002/09/24 12:41:04 mckay Exp $ 39 * $DragonFly: src/bin/cp/cp.c,v 1.2 2003/06/17 04:22:49 dillon 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/param.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 <stdio.h> 65 #include <stdlib.h> 66 #include <string.h> 67 #include <unistd.h> 68 69 #include "extern.h" 70 71 #define STRIP_TRAILING_SLASH(p) { \ 72 while ((p).p_end > (p).p_path + 1 && (p).p_end[-1] == '/') \ 73 *--(p).p_end = 0; \ 74 } 75 76 PATH_T to = { to.p_path, "", "" }; 77 78 int Rflag, fflag, iflag, nflag, pflag, rflag, vflag; 79 80 enum op { FILE_TO_FILE, FILE_TO_DIR, DIR_TO_DNE }; 81 82 int copy __P((char *[], enum op, int)); 83 int mastercmp __P((const FTSENT **, const FTSENT **)); 84 85 int 86 main(argc, argv) 87 int argc; 88 char *argv[]; 89 { 90 struct stat to_stat, tmp_stat; 91 enum op type; 92 int Hflag, Lflag, Pflag, ch, fts_options, r; 93 char *target; 94 95 Hflag = Lflag = Pflag = 0; 96 while ((ch = getopt(argc, argv, "HLPRfinprv")) != -1) 97 switch (ch) { 98 case 'H': 99 Hflag = 1; 100 Lflag = Pflag = 0; 101 break; 102 case 'L': 103 Lflag = 1; 104 Hflag = Pflag = 0; 105 break; 106 case 'P': 107 Pflag = 1; 108 Hflag = Lflag = 0; 109 break; 110 case 'R': 111 Rflag = 1; 112 break; 113 case 'f': 114 fflag = 1; 115 iflag = nflag = 0; 116 break; 117 case 'i': 118 iflag = 1; 119 fflag = nflag = 0; 120 break; 121 case 'n': 122 nflag = 1; 123 fflag = iflag = 0; 124 break; 125 case 'p': 126 pflag = 1; 127 break; 128 case 'r': 129 rflag = 1; 130 break; 131 case 'v': 132 vflag = 1; 133 break; 134 default: 135 usage(); 136 break; 137 } 138 argc -= optind; 139 argv += optind; 140 141 if (argc < 2) 142 usage(); 143 144 fts_options = FTS_NOCHDIR | FTS_PHYSICAL; 145 if (rflag) { 146 if (Rflag) 147 errx(1, 148 "the -R and -r options may not be specified together."); 149 if (Hflag || Lflag || Pflag) 150 errx(1, 151 "the -H, -L, and -P options may not be specified with the -r option."); 152 fts_options &= ~FTS_PHYSICAL; 153 fts_options |= FTS_LOGICAL; 154 } 155 if (Rflag) { 156 if (Hflag) 157 fts_options |= FTS_COMFOLLOW; 158 if (Lflag) { 159 fts_options &= ~FTS_PHYSICAL; 160 fts_options |= FTS_LOGICAL; 161 } 162 } else { 163 fts_options &= ~FTS_PHYSICAL; 164 fts_options |= FTS_LOGICAL; 165 } 166 167 /* Save the target base in "to". */ 168 target = argv[--argc]; 169 if (strlcpy(to.p_path, target, sizeof(to.p_path)) >= sizeof(to.p_path)) 170 errx(1, "%s: name too long", target); 171 to.p_end = to.p_path + strlen(to.p_path); 172 if (to.p_path == to.p_end) { 173 *to.p_end++ = '.'; 174 *to.p_end = 0; 175 } 176 STRIP_TRAILING_SLASH(to); 177 to.target_end = to.p_end; 178 179 /* Set end of argument list for fts(3). */ 180 argv[argc] = NULL; 181 182 /* 183 * Cp has two distinct cases: 184 * 185 * cp [-R] source target 186 * cp [-R] source1 ... sourceN directory 187 * 188 * In both cases, source can be either a file or a directory. 189 * 190 * In (1), the target becomes a copy of the source. That is, if the 191 * source is a file, the target will be a file, and likewise for 192 * directories. 193 * 194 * In (2), the real target is not directory, but "directory/source". 195 */ 196 r = stat(to.p_path, &to_stat); 197 if (r == -1 && errno != ENOENT) 198 err(1, "%s", to.p_path); 199 if (r == -1 || !S_ISDIR(to_stat.st_mode)) { 200 /* 201 * Case (1). Target is not a directory. 202 */ 203 if (argc > 1) { 204 usage(); 205 exit(1); 206 } 207 /* 208 * Need to detect the case: 209 * cp -R dir foo 210 * Where dir is a directory and foo does not exist, where 211 * we want pathname concatenations turned on but not for 212 * the initial mkdir(). 213 */ 214 if (r == -1) { 215 if (rflag || (Rflag && (Lflag || Hflag))) 216 stat(*argv, &tmp_stat); 217 else 218 lstat(*argv, &tmp_stat); 219 220 if (S_ISDIR(tmp_stat.st_mode) && (Rflag || rflag)) 221 type = DIR_TO_DNE; 222 else 223 type = FILE_TO_FILE; 224 } else 225 type = FILE_TO_FILE; 226 } else 227 /* 228 * Case (2). Target is a directory. 229 */ 230 type = FILE_TO_DIR; 231 232 exit (copy(argv, type, fts_options)); 233 } 234 235 int 236 copy(argv, type, fts_options) 237 char *argv[]; 238 enum op type; 239 int fts_options; 240 { 241 struct stat to_stat; 242 FTS *ftsp; 243 FTSENT *curr; 244 int base = 0, dne, badcp, nlen, rval; 245 char *p, *target_mid; 246 mode_t mask, mode; 247 248 /* 249 * Keep an inverted copy of the umask, for use in correcting 250 * permissions on created directories when not using -p. 251 */ 252 mask = ~umask(0777); 253 umask(~mask); 254 255 if ((ftsp = fts_open(argv, fts_options, mastercmp)) == NULL) 256 err(1, NULL); 257 for (badcp = rval = 0; (curr = fts_read(ftsp)) != NULL; badcp = 0) { 258 switch (curr->fts_info) { 259 case FTS_NS: 260 case FTS_DNR: 261 case FTS_ERR: 262 warnx("%s: %s", 263 curr->fts_path, strerror(curr->fts_errno)); 264 badcp = rval = 1; 265 continue; 266 case FTS_DC: /* Warn, continue. */ 267 warnx("%s: directory causes a cycle", curr->fts_path); 268 badcp = rval = 1; 269 continue; 270 } 271 272 /* 273 * If we are in case (2) or (3) above, we need to append the 274 * source name to the target name. 275 */ 276 if (type != FILE_TO_FILE) { 277 /* 278 * Need to remember the roots of traversals to create 279 * correct pathnames. If there's a directory being 280 * copied to a non-existent directory, e.g. 281 * cp -R a/dir noexist 282 * the resulting path name should be noexist/foo, not 283 * noexist/dir/foo (where foo is a file in dir), which 284 * is the case where the target exists. 285 * 286 * Also, check for "..". This is for correct path 287 * concatenation for paths ending in "..", e.g. 288 * cp -R .. /tmp 289 * Paths ending in ".." are changed to ".". This is 290 * tricky, but seems the easiest way to fix the problem. 291 * 292 * XXX 293 * Since the first level MUST be FTS_ROOTLEVEL, base 294 * is always initialized. 295 */ 296 if (curr->fts_level == FTS_ROOTLEVEL) { 297 if (type != DIR_TO_DNE) { 298 p = strrchr(curr->fts_path, '/'); 299 base = (p == NULL) ? 0 : 300 (int)(p - curr->fts_path + 1); 301 302 if (!strcmp(&curr->fts_path[base], 303 "..")) 304 base += 1; 305 } else 306 base = curr->fts_pathlen; 307 } 308 309 p = &curr->fts_path[base]; 310 nlen = curr->fts_pathlen - base; 311 target_mid = to.target_end; 312 if (*p != '/' && target_mid[-1] != '/') 313 *target_mid++ = '/'; 314 *target_mid = 0; 315 if (target_mid - to.p_path + nlen >= PATH_MAX) { 316 warnx("%s%s: name too long (not copied)", 317 to.p_path, p); 318 badcp = rval = 1; 319 continue; 320 } 321 (void)strncat(target_mid, p, nlen); 322 to.p_end = target_mid + nlen; 323 *to.p_end = 0; 324 STRIP_TRAILING_SLASH(to); 325 } 326 327 if (curr->fts_info == FTS_DP) { 328 /* 329 * We are nearly finished with this directory. If we 330 * didn't actually copy it, or otherwise don't need to 331 * change its attributes, then we are done. 332 */ 333 if (!curr->fts_number) 334 continue; 335 /* 336 * If -p is in effect, set all the attributes. 337 * Otherwise, set the correct permissions, limited 338 * by the umask. Optimise by avoiding a chmod() 339 * if possible (which is usually the case if we 340 * made the directory). Note that mkdir() does not 341 * honour setuid, setgid and sticky bits, but we 342 * normally want to preserve them on directories. 343 */ 344 if (pflag) { 345 if (setfile(curr->fts_statp, 0)) 346 rval = 1; 347 } else { 348 mode = curr->fts_statp->st_mode; 349 if ((mode & (S_ISUID | S_ISGID | S_ISTXT)) || 350 ((mode | S_IRWXU) & mask) != (mode & mask)) 351 if (chmod(to.p_path, mode & mask) != 0){ 352 warn("chmod: %s", to.p_path); 353 rval = 1; 354 } 355 } 356 continue; 357 } 358 359 /* Not an error but need to remember it happened */ 360 if (stat(to.p_path, &to_stat) == -1) 361 dne = 1; 362 else { 363 if (to_stat.st_dev == curr->fts_statp->st_dev && 364 to_stat.st_ino == curr->fts_statp->st_ino) { 365 warnx("%s and %s are identical (not copied).", 366 to.p_path, curr->fts_path); 367 badcp = rval = 1; 368 if (S_ISDIR(curr->fts_statp->st_mode)) 369 (void)fts_set(ftsp, curr, FTS_SKIP); 370 continue; 371 } 372 if (!S_ISDIR(curr->fts_statp->st_mode) && 373 S_ISDIR(to_stat.st_mode)) { 374 warnx("cannot overwrite directory %s with non-directory %s", 375 to.p_path, curr->fts_path); 376 badcp = rval = 1; 377 continue; 378 } 379 dne = 0; 380 } 381 382 switch (curr->fts_statp->st_mode & S_IFMT) { 383 case S_IFLNK: 384 if (copy_link(curr, !dne)) 385 badcp = rval = 1; 386 break; 387 case S_IFDIR: 388 if (!Rflag && !rflag) { 389 warnx("%s is a directory (not copied).", 390 curr->fts_path); 391 (void)fts_set(ftsp, curr, FTS_SKIP); 392 badcp = rval = 1; 393 break; 394 } 395 /* 396 * If the directory doesn't exist, create the new 397 * one with the from file mode plus owner RWX bits, 398 * modified by the umask. Trade-off between being 399 * able to write the directory (if from directory is 400 * 555) and not causing a permissions race. If the 401 * umask blocks owner writes, we fail.. 402 */ 403 if (dne) { 404 if (mkdir(to.p_path, 405 curr->fts_statp->st_mode | S_IRWXU) < 0) 406 err(1, "%s", to.p_path); 407 } else if (!S_ISDIR(to_stat.st_mode)) { 408 errno = ENOTDIR; 409 err(1, "%s", to.p_path); 410 } 411 /* 412 * Arrange to correct directory attributes later 413 * (in the post-order phase) if this is a new 414 * directory, or if the -p flag is in effect. 415 */ 416 curr->fts_number = pflag || dne; 417 break; 418 case S_IFBLK: 419 case S_IFCHR: 420 if (Rflag) { 421 if (copy_special(curr->fts_statp, !dne)) 422 badcp = rval = 1; 423 } else { 424 if (copy_file(curr, dne)) 425 badcp = rval = 1; 426 } 427 break; 428 case S_IFIFO: 429 if (Rflag) { 430 if (copy_fifo(curr->fts_statp, !dne)) 431 badcp = rval = 1; 432 } else { 433 if (copy_file(curr, dne)) 434 badcp = rval = 1; 435 } 436 break; 437 default: 438 if (copy_file(curr, dne)) 439 badcp = rval = 1; 440 break; 441 } 442 if (vflag && !badcp) 443 (void)printf("%s -> %s\n", curr->fts_path, to.p_path); 444 } 445 if (errno) 446 err(1, "fts_read"); 447 return (rval); 448 } 449 450 /* 451 * mastercmp -- 452 * The comparison function for the copy order. The order is to copy 453 * non-directory files before directory files. The reason for this 454 * is because files tend to be in the same cylinder group as their 455 * parent directory, whereas directories tend not to be. Copying the 456 * files first reduces seeking. 457 */ 458 int 459 mastercmp(a, b) 460 const FTSENT **a, **b; 461 { 462 int a_info, b_info; 463 464 a_info = (*a)->fts_info; 465 if (a_info == FTS_ERR || a_info == FTS_NS || a_info == FTS_DNR) 466 return (0); 467 b_info = (*b)->fts_info; 468 if (b_info == FTS_ERR || b_info == FTS_NS || b_info == FTS_DNR) 469 return (0); 470 if (a_info == FTS_D) 471 return (-1); 472 if (b_info == FTS_D) 473 return (1); 474 return (0); 475 } 476