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 1.9 2004/11/07 20:54:51 eirikn 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, to.p_path, "" }; 77 78 int fflag, iflag, nflag, pflag, vflag; 79 static int Rflag, rflag; 80 81 enum op { FILE_TO_FILE, FILE_TO_DIR, DIR_TO_DNE }; 82 83 static int copy (char **, enum op, int); 84 static int mastercmp (const FTSENT **, const FTSENT **); 85 86 int 87 main(int argc, char **argv) 88 { 89 struct stat to_stat, tmp_stat; 90 enum op type; 91 int Hflag, Lflag, Pflag, ch, fts_options, r; 92 char *target; 93 94 Hflag = Lflag = Pflag = 0; 95 while ((ch = getopt(argc, argv, "HLPRfinprv")) != -1) 96 switch (ch) { 97 case 'H': 98 Hflag = 1; 99 Lflag = Pflag = 0; 100 break; 101 case 'L': 102 Lflag = 1; 103 Hflag = Pflag = 0; 104 break; 105 case 'P': 106 Pflag = 1; 107 Hflag = Lflag = 0; 108 break; 109 case 'R': 110 Rflag = 1; 111 break; 112 case 'f': 113 fflag = 1; 114 iflag = nflag = 0; 115 break; 116 case 'i': 117 iflag = 1; 118 fflag = nflag = 0; 119 break; 120 case 'n': 121 nflag = 1; 122 fflag = iflag = 0; 123 break; 124 case 'p': 125 pflag = 1; 126 break; 127 case 'r': 128 rflag = 1; 129 break; 130 case 'v': 131 vflag = 1; 132 break; 133 default: 134 usage(); 135 break; 136 } 137 argc -= optind; 138 argv += optind; 139 140 if (argc < 2) 141 usage(); 142 143 fts_options = FTS_NOCHDIR | FTS_PHYSICAL; 144 if (rflag) { 145 if (Rflag) 146 errx(1, 147 "the -R and -r options may not be specified together."); 148 if (Hflag || Lflag || Pflag) 149 errx(1, 150 "the -H, -L, and -P options may not be specified with the -r option."); 151 fts_options &= ~FTS_PHYSICAL; 152 fts_options |= FTS_LOGICAL; 153 } 154 if (Rflag) { 155 if (Hflag) 156 fts_options |= FTS_COMFOLLOW; 157 if (Lflag) { 158 fts_options &= ~FTS_PHYSICAL; 159 fts_options |= FTS_LOGICAL; 160 } 161 } else { 162 fts_options &= ~FTS_PHYSICAL; 163 fts_options |= FTS_LOGICAL; 164 } 165 166 /* Save the target base in "to". */ 167 target = argv[--argc]; 168 if (strlcpy(to.p_path, target, sizeof(to.p_path)) >= sizeof(to.p_path)) 169 errx(1, "%s: name too long", target); 170 to.p_end = to.p_path + strlen(to.p_path); 171 if (to.p_path == to.p_end) { 172 *to.p_end++ = '.'; 173 *to.p_end = 0; 174 } 175 STRIP_TRAILING_SLASH(to); 176 to.target_end = to.p_end; 177 178 /* Set end of argument list for fts(3). */ 179 argv[argc] = NULL; 180 181 /* 182 * Cp has two distinct cases: 183 * 184 * cp [-R] source target 185 * cp [-R] source1 ... sourceN directory 186 * 187 * In both cases, source can be either a file or a directory. 188 * 189 * In (1), the target becomes a copy of the source. That is, if the 190 * source is a file, the target will be a file, and likewise for 191 * directories. 192 * 193 * In (2), the real target is not directory, but "directory/source". 194 */ 195 r = stat(to.p_path, &to_stat); 196 if (r == -1 && errno != ENOENT) 197 err(1, "%s", to.p_path); 198 if (r == -1 || !S_ISDIR(to_stat.st_mode)) { 199 /* 200 * Case (1). Target is not a directory. 201 */ 202 if (argc > 1) { 203 usage(); 204 exit(1); 205 } 206 /* 207 * Need to detect the case: 208 * cp -R dir foo 209 * Where dir is a directory and foo does not exist, where 210 * we want pathname concatenations turned on but not for 211 * the initial mkdir(). 212 */ 213 if (r == -1) { 214 if (rflag || (Rflag && (Lflag || Hflag))) 215 stat(*argv, &tmp_stat); 216 else 217 lstat(*argv, &tmp_stat); 218 219 if (S_ISDIR(tmp_stat.st_mode) && (Rflag || rflag)) 220 type = DIR_TO_DNE; 221 else 222 type = FILE_TO_FILE; 223 } else 224 type = FILE_TO_FILE; 225 } else 226 /* 227 * Case (2). Target is a directory. 228 */ 229 type = FILE_TO_DIR; 230 231 exit (copy(argv, type, fts_options)); 232 } 233 234 static int 235 copy(char **argv, enum op type, int fts_options) 236 { 237 struct stat to_stat; 238 FTS *ftsp; 239 FTSENT *curr; 240 int base, dne, badcp, nlen, rval; 241 char *p, *target_mid; 242 mode_t mask, mode; 243 244 /* 245 * Keep an inverted copy of the umask, for use in correcting 246 * permissions on created directories when not using -p. 247 */ 248 mask = ~umask(0777); 249 umask(~mask); 250 base = 0; 251 252 if ((ftsp = fts_open(argv, fts_options, mastercmp)) == NULL) 253 err(1, NULL); 254 for (badcp = rval = 0; (curr = fts_read(ftsp)) != NULL; badcp = 0) { 255 switch (curr->fts_info) { 256 case FTS_NS: 257 case FTS_DNR: 258 case FTS_ERR: 259 warnx("%s: %s", 260 curr->fts_path, strerror(curr->fts_errno)); 261 badcp = rval = 1; 262 continue; 263 case FTS_DC: /* Warn, continue. */ 264 warnx("%s: directory causes a cycle", curr->fts_path); 265 badcp = rval = 1; 266 continue; 267 } 268 269 /* 270 * If we are in case (2) or (3) above, we need to append the 271 * source name to the target name. 272 */ 273 if (type != FILE_TO_FILE) { 274 /* 275 * Need to remember the roots of traversals to create 276 * correct pathnames. If there's a directory being 277 * copied to a non-existent directory, e.g. 278 * cp -R a/dir noexist 279 * the resulting path name should be noexist/foo, not 280 * noexist/dir/foo (where foo is a file in dir), which 281 * is the case where the target exists. 282 * 283 * Also, check for "..". This is for correct path 284 * concatenation for paths ending in "..", e.g. 285 * cp -R .. /tmp 286 * Paths ending in ".." are changed to ".". This is 287 * tricky, but seems the easiest way to fix the problem. 288 * 289 * XXX 290 * Since the first level MUST be FTS_ROOTLEVEL, base 291 * is always initialized. 292 */ 293 if (curr->fts_level == FTS_ROOTLEVEL) { 294 if (type != DIR_TO_DNE) { 295 p = strrchr(curr->fts_path, '/'); 296 base = (p == NULL) ? 0 : 297 (int)(p - curr->fts_path + 1); 298 299 if (!strcmp(&curr->fts_path[base], 300 "..")) 301 base += 1; 302 } else 303 base = curr->fts_pathlen; 304 } 305 306 p = &curr->fts_path[base]; 307 nlen = curr->fts_pathlen - base; 308 target_mid = to.target_end; 309 if (*p != '/' && target_mid[-1] != '/') 310 *target_mid++ = '/'; 311 *target_mid = 0; 312 if (target_mid - to.p_path + nlen >= PATH_MAX) { 313 warnx("%s%s: name too long (not copied)", 314 to.p_path, p); 315 badcp = rval = 1; 316 continue; 317 } 318 strncat(target_mid, p, nlen); 319 to.p_end = target_mid + nlen; 320 *to.p_end = 0; 321 STRIP_TRAILING_SLASH(to); 322 } 323 324 if (curr->fts_info == FTS_DP) { 325 /* 326 * We are nearly finished with this directory. If we 327 * didn't actually copy it, or otherwise don't need to 328 * change its attributes, then we are done. 329 */ 330 if (!curr->fts_number) 331 continue; 332 /* 333 * If -p is in effect, set all the attributes. 334 * Otherwise, set the correct permissions, limited 335 * by the umask. Optimise by avoiding a chmod() 336 * if possible (which is usually the case if we 337 * made the directory). Note that mkdir() does not 338 * honour setuid, setgid and sticky bits, but we 339 * normally want to preserve them on directories. 340 */ 341 if (pflag) { 342 if (setfile(curr->fts_statp, 0)) 343 rval = 1; 344 } else { 345 mode = curr->fts_statp->st_mode; 346 if ((mode & (S_ISUID | S_ISGID | S_ISTXT)) || 347 ((mode | S_IRWXU) & mask) != (mode & mask)) 348 if (chmod(to.p_path, mode & mask) != 0){ 349 warn("chmod: %s", to.p_path); 350 rval = 1; 351 } 352 } 353 continue; 354 } 355 356 /* Not an error but need to remember it happened */ 357 if (stat(to.p_path, &to_stat) == -1) 358 dne = 1; 359 else { 360 if (to_stat.st_dev == curr->fts_statp->st_dev && 361 to_stat.st_ino == curr->fts_statp->st_ino) { 362 warnx("%s and %s are identical (not copied).", 363 to.p_path, curr->fts_path); 364 badcp = rval = 1; 365 if (S_ISDIR(curr->fts_statp->st_mode)) 366 fts_set(ftsp, curr, FTS_SKIP); 367 continue; 368 } 369 if (!S_ISDIR(curr->fts_statp->st_mode) && 370 S_ISDIR(to_stat.st_mode)) { 371 warnx("cannot overwrite directory %s with non-directory %s", 372 to.p_path, curr->fts_path); 373 badcp = rval = 1; 374 continue; 375 } 376 dne = 0; 377 } 378 379 switch (curr->fts_statp->st_mode & S_IFMT) { 380 case S_IFLNK: 381 if (copy_link(curr, !dne)) 382 badcp = rval = 1; 383 break; 384 case S_IFDIR: 385 if (!Rflag && !rflag) { 386 warnx("%s is a directory (not copied).", 387 curr->fts_path); 388 fts_set(ftsp, curr, FTS_SKIP); 389 badcp = rval = 1; 390 break; 391 } 392 /* 393 * If the directory doesn't exist, create the new 394 * one with the from file mode plus owner RWX bits, 395 * modified by the umask. Trade-off between being 396 * able to write the directory (if from directory is 397 * 555) and not causing a permissions race. If the 398 * umask blocks owner writes, we fail.. 399 */ 400 if (dne) { 401 if (mkdir(to.p_path, 402 curr->fts_statp->st_mode | S_IRWXU) < 0) 403 err(1, "%s", to.p_path); 404 } else if (!S_ISDIR(to_stat.st_mode)) { 405 errno = ENOTDIR; 406 err(1, "%s", to.p_path); 407 } 408 /* 409 * Arrange to correct directory attributes later 410 * (in the post-order phase) if this is a new 411 * directory, or if the -p flag is in effect. 412 */ 413 curr->fts_number = pflag || dne; 414 break; 415 case S_IFBLK: 416 case S_IFCHR: 417 if (Rflag) { 418 if (copy_special(curr->fts_statp, !dne)) 419 badcp = rval = 1; 420 } else { 421 if (copy_file(curr, dne)) 422 badcp = rval = 1; 423 } 424 break; 425 case S_IFIFO: 426 if (Rflag) { 427 if (copy_fifo(curr->fts_statp, !dne)) 428 badcp = rval = 1; 429 } else { 430 if (copy_file(curr, dne)) 431 badcp = rval = 1; 432 } 433 break; 434 default: 435 if (copy_file(curr, dne)) 436 badcp = rval = 1; 437 break; 438 } 439 if (vflag && !badcp) 440 printf("%s -> %s\n", curr->fts_path, to.p_path); 441 } 442 if (errno) 443 err(1, "fts_read"); 444 return (rval); 445 } 446 447 /* 448 * mastercmp -- 449 * The comparison function for the copy order. The order is to copy 450 * non-directory files before directory files. The reason for this 451 * is because files tend to be in the same cylinder group as their 452 * parent directory, whereas directories tend not to be. Copying the 453 * files first reduces seeking. 454 */ 455 static int 456 mastercmp(const FTSENT **a, const FTSENT **b) 457 { 458 int a_info, b_info; 459 460 a_info = (*a)->fts_info; 461 if (a_info == FTS_ERR || a_info == FTS_NS || a_info == FTS_DNR) 462 return (0); 463 b_info = (*b)->fts_info; 464 if (b_info == FTS_ERR || b_info == FTS_NS || b_info == FTS_DNR) 465 return (0); 466 if (a_info == FTS_D) 467 return (-1); 468 if (b_info == FTS_D) 469 return (1); 470 return (0); 471 } 472