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 #ifndef lint 38 static char const copyright[] = 39 "@(#) Copyright (c) 1988, 1993, 1994\n\ 40 The Regents of the University of California. All rights reserved.\n"; 41 #endif /* not lint */ 42 43 #ifndef lint 44 #if 0 45 static char sccsid[] = "@(#)cp.c 8.2 (Berkeley) 4/1/94"; 46 #endif 47 static const char rcsid[] = 48 "$FreeBSD$"; 49 #endif /* not lint */ 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/param.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 <stdio.h> 74 #include <stdlib.h> 75 #include <string.h> 76 #include <unistd.h> 77 78 #include "extern.h" 79 80 #define STRIP_TRAILING_SLASH(p) { \ 81 while ((p).p_end > (p).p_path + 1 && (p).p_end[-1] == '/') \ 82 *--(p).p_end = 0; \ 83 } 84 85 static char emptystring[] = ""; 86 87 PATH_T to = { to.p_path, emptystring, "" }; 88 89 int iflag, pflag, fflag; 90 static int Rflag, rflag, vflag; 91 92 enum op { FILE_TO_FILE, FILE_TO_DIR, DIR_TO_DNE }; 93 94 int copy(char *[], enum op, int); 95 int mastercmp(const FTSENT **, const FTSENT **); 96 97 int 98 main(int argc, char *argv[]) 99 { 100 struct stat to_stat, tmp_stat; 101 enum op type; 102 int Hflag, Lflag, Pflag, ch, fts_options, r; 103 char *target; 104 105 Hflag = Lflag = Pflag = 0; 106 while ((ch = getopt(argc, argv, "HLPRfiprv")) != -1) 107 switch (ch) { 108 case 'H': 109 Hflag = 1; 110 Lflag = Pflag = 0; 111 break; 112 case 'L': 113 Lflag = 1; 114 Hflag = Pflag = 0; 115 break; 116 case 'P': 117 Pflag = 1; 118 Hflag = Lflag = 0; 119 break; 120 case 'R': 121 Rflag = 1; 122 break; 123 case 'f': 124 fflag = 1; 125 iflag = 0; 126 break; 127 case 'i': 128 iflag = 1; 129 fflag = 0; 130 break; 131 case 'p': 132 pflag = 1; 133 break; 134 case 'r': 135 rflag = 1; 136 break; 137 case 'v': 138 vflag = 1; 139 break; 140 default: 141 usage(); 142 break; 143 } 144 argc -= optind; 145 argv += optind; 146 147 if (argc < 2) 148 usage(); 149 150 fts_options = FTS_NOCHDIR | FTS_PHYSICAL; 151 if (rflag) { 152 if (Rflag) 153 errx(1, 154 "the -R and -r options may not be specified together."); 155 if (Hflag || Lflag || Pflag) 156 errx(1, 157 "the -H, -L, and -P options may not be specified with the -r option."); 158 fts_options &= ~FTS_PHYSICAL; 159 fts_options |= FTS_LOGICAL; 160 } 161 if (Rflag) { 162 if (Hflag) 163 fts_options |= FTS_COMFOLLOW; 164 if (Lflag) { 165 fts_options &= ~FTS_PHYSICAL; 166 fts_options |= FTS_LOGICAL; 167 } 168 } else { 169 fts_options &= ~FTS_PHYSICAL; 170 fts_options |= FTS_LOGICAL; 171 } 172 173 /* Save the target base in "to". */ 174 target = argv[--argc]; 175 if (strlcpy(to.p_path, target, sizeof(to.p_path)) >= sizeof(to.p_path)) 176 errx(1, "%s: name too long", target); 177 to.p_end = to.p_path + strlen(to.p_path); 178 if (to.p_path == to.p_end) { 179 *to.p_end++ = '.'; 180 *to.p_end = 0; 181 } 182 STRIP_TRAILING_SLASH(to); 183 to.target_end = to.p_end; 184 185 /* Set end of argument list for fts(3). */ 186 argv[argc] = NULL; 187 188 /* 189 * Cp has two distinct cases: 190 * 191 * cp [-R] source target 192 * cp [-R] source1 ... sourceN directory 193 * 194 * In both cases, source can be either a file or a directory. 195 * 196 * In (1), the target becomes a copy of the source. That is, if the 197 * source is a file, the target will be a file, and likewise for 198 * directories. 199 * 200 * In (2), the real target is not directory, but "directory/source". 201 */ 202 r = stat(to.p_path, &to_stat); 203 if (r == -1 && errno != ENOENT) 204 err(1, "%s", to.p_path); 205 if (r == -1 || !S_ISDIR(to_stat.st_mode)) { 206 /* 207 * Case (1). Target is not a directory. 208 */ 209 if (argc > 1) { 210 usage(); 211 exit(1); 212 } 213 /* 214 * Need to detect the case: 215 * cp -R dir foo 216 * Where dir is a directory and foo does not exist, where 217 * we want pathname concatenations turned on but not for 218 * the initial mkdir(). 219 */ 220 if (r == -1) { 221 if (rflag || (Rflag && (Lflag || Hflag))) 222 stat(*argv, &tmp_stat); 223 else 224 lstat(*argv, &tmp_stat); 225 226 if (S_ISDIR(tmp_stat.st_mode) && (Rflag || rflag)) 227 type = DIR_TO_DNE; 228 else 229 type = FILE_TO_FILE; 230 } else 231 type = FILE_TO_FILE; 232 } else 233 /* 234 * Case (2). Target is a directory. 235 */ 236 type = FILE_TO_DIR; 237 238 exit (copy(argv, type, fts_options)); 239 } 240 241 int 242 copy(char *argv[], enum op type, int fts_options) 243 { 244 struct stat to_stat; 245 FTS *ftsp; 246 FTSENT *curr; 247 int base = 0, dne, badcp, rval; 248 size_t nlen; 249 char *p, *target_mid; 250 mode_t mask, mode; 251 252 /* 253 * Keep an inverted copy of the umask, for use in correcting 254 * permissions on created directories when not using -p. 255 */ 256 mask = ~umask(0777); 257 umask(~mask); 258 259 if ((ftsp = fts_open(argv, fts_options, mastercmp)) == NULL) 260 err(1, NULL); 261 for (badcp = rval = 0; (curr = fts_read(ftsp)) != NULL; badcp = 0) { 262 switch (curr->fts_info) { 263 case FTS_NS: 264 case FTS_DNR: 265 case FTS_ERR: 266 warnx("%s: %s", 267 curr->fts_path, strerror(curr->fts_errno)); 268 badcp = rval = 1; 269 continue; 270 case FTS_DC: /* Warn, continue. */ 271 warnx("%s: directory causes a cycle", curr->fts_path); 272 badcp = rval = 1; 273 continue; 274 default: 275 } 276 277 /* 278 * If we are in case (2) or (3) above, we need to append the 279 * source name to the target name. 280 */ 281 if (type != FILE_TO_FILE) { 282 /* 283 * Need to remember the roots of traversals to create 284 * correct pathnames. If there's a directory being 285 * copied to a non-existent directory, e.g. 286 * cp -R a/dir noexist 287 * the resulting path name should be noexist/foo, not 288 * noexist/dir/foo (where foo is a file in dir), which 289 * is the case where the target exists. 290 * 291 * Also, check for "..". This is for correct path 292 * concatenation for paths ending in "..", e.g. 293 * cp -R .. /tmp 294 * Paths ending in ".." are changed to ".". This is 295 * tricky, but seems the easiest way to fix the problem. 296 * 297 * XXX 298 * Since the first level MUST be FTS_ROOTLEVEL, base 299 * is always initialized. 300 */ 301 if (curr->fts_level == FTS_ROOTLEVEL) { 302 if (type != DIR_TO_DNE) { 303 p = strrchr(curr->fts_path, '/'); 304 base = (p == NULL) ? 0 : 305 (int)(p - curr->fts_path + 1); 306 307 if (!strcmp(&curr->fts_path[base], 308 "..")) 309 base += 1; 310 } else 311 base = curr->fts_pathlen; 312 } 313 314 p = &curr->fts_path[base]; 315 nlen = curr->fts_pathlen - base; 316 target_mid = to.target_end; 317 if (*p != '/' && target_mid[-1] != '/') 318 *target_mid++ = '/'; 319 *target_mid = 0; 320 if (target_mid - to.p_path + nlen >= PATH_MAX) { 321 warnx("%s%s: name too long (not copied)", 322 to.p_path, p); 323 badcp = rval = 1; 324 continue; 325 } 326 (void)strncat(target_mid, p, nlen); 327 to.p_end = target_mid + nlen; 328 *to.p_end = 0; 329 STRIP_TRAILING_SLASH(to); 330 } 331 332 if (curr->fts_info == FTS_DP) { 333 /* 334 * We are nearly finished with this directory. If we 335 * didn't actually copy it, or otherwise don't need to 336 * change its attributes, then we are done. 337 */ 338 if (!curr->fts_number) 339 continue; 340 /* 341 * If -p is in effect, set all the attributes. 342 * Otherwise, set the correct permissions, limited 343 * by the umask. Optimise by avoiding a chmod() 344 * if possible (which is usually the case if we 345 * made the directory). Note that mkdir() does not 346 * honour setuid, setgid and sticky bits, but we 347 * normally want to preserve them on directories. 348 */ 349 if (pflag) 350 rval = setfile(curr->fts_statp, 0); 351 else { 352 mode = curr->fts_statp->st_mode; 353 if ((mode & (S_ISUID | S_ISGID | S_ISTXT)) || 354 ((mode | S_IRWXU) & mask) != (mode & mask)) 355 if (chmod(to.p_path, mode & mask) != 0){ 356 warn("chmod: %s", to.p_path); 357 rval = 1; 358 } 359 } 360 continue; 361 } 362 363 /* Not an error but need to remember it happened */ 364 if (stat(to.p_path, &to_stat) == -1) 365 dne = 1; 366 else { 367 if (to_stat.st_dev == curr->fts_statp->st_dev && 368 to_stat.st_ino == curr->fts_statp->st_ino) { 369 warnx("%s and %s are identical (not copied).", 370 to.p_path, curr->fts_path); 371 badcp = rval = 1; 372 if (S_ISDIR(curr->fts_statp->st_mode)) 373 (void)fts_set(ftsp, curr, FTS_SKIP); 374 continue; 375 } 376 if (!S_ISDIR(curr->fts_statp->st_mode) && 377 S_ISDIR(to_stat.st_mode)) { 378 warnx("cannot overwrite directory %s with " 379 "non-directory %s", 380 to.p_path, curr->fts_path); 381 badcp = rval = 1; 382 continue; 383 } 384 dne = 0; 385 } 386 387 switch (curr->fts_statp->st_mode & S_IFMT) { 388 case S_IFLNK: 389 if (copy_link(curr, !dne)) 390 badcp = rval = 1; 391 break; 392 case S_IFDIR: 393 if (!Rflag && !rflag) { 394 warnx("%s is a directory (not copied).", 395 curr->fts_path); 396 (void)fts_set(ftsp, curr, FTS_SKIP); 397 badcp = rval = 1; 398 break; 399 } 400 /* 401 * If the directory doesn't exist, create the new 402 * one with the from file mode plus owner RWX bits, 403 * modified by the umask. Trade-off between being 404 * able to write the directory (if from directory is 405 * 555) and not causing a permissions race. If the 406 * umask blocks owner writes, we fail.. 407 */ 408 if (dne) { 409 if (mkdir(to.p_path, 410 curr->fts_statp->st_mode | S_IRWXU) < 0) 411 err(1, "%s", to.p_path); 412 } else if (!S_ISDIR(to_stat.st_mode)) { 413 errno = ENOTDIR; 414 err(1, "%s", to.p_path); 415 } 416 /* 417 * Arrange to correct directory attributes later 418 * (in the post-order phase) if this is a new 419 * directory, or if the -p flag is in effect. 420 */ 421 curr->fts_number = pflag || dne; 422 break; 423 case S_IFBLK: 424 case S_IFCHR: 425 if (Rflag) { 426 if (copy_special(curr->fts_statp, !dne)) 427 badcp = rval = 1; 428 } else { 429 if (copy_file(curr, dne)) 430 badcp = rval = 1; 431 } 432 break; 433 case S_IFIFO: 434 if (Rflag) { 435 if (copy_fifo(curr->fts_statp, !dne)) 436 badcp = rval = 1; 437 } else { 438 if (copy_file(curr, dne)) 439 badcp = rval = 1; 440 } 441 break; 442 default: 443 if (copy_file(curr, dne)) 444 badcp = rval = 1; 445 break; 446 } 447 if (vflag && !badcp) 448 (void)printf("%s -> %s\n", curr->fts_path, to.p_path); 449 } 450 if (errno) 451 err(1, "fts_read"); 452 return (rval); 453 } 454 455 /* 456 * mastercmp -- 457 * The comparison function for the copy order. The order is to copy 458 * non-directory files before directory files. The reason for this 459 * is because files tend to be in the same cylinder group as their 460 * parent directory, whereas directories tend not to be. Copying the 461 * files first reduces seeking. 462 */ 463 int 464 mastercmp(const FTSENT **a, const FTSENT **b) 465 { 466 int a_info, b_info; 467 468 a_info = (*a)->fts_info; 469 if (a_info == FTS_ERR || a_info == FTS_NS || a_info == FTS_DNR) 470 return (0); 471 b_info = (*b)->fts_info; 472 if (b_info == FTS_ERR || b_info == FTS_NS || b_info == FTS_DNR) 473 return (0); 474 if (a_info == FTS_D) 475 return (-1); 476 if (b_info == FTS_D) 477 return (1); 478 return (0); 479 } 480