1 /* $OpenBSD: cp.c,v 1.17 2001/06/25 04:35:31 art Exp $ */ 2 /* $NetBSD: cp.c,v 1.14 1995/09/07 06:14:51 jtc Exp $ */ 3 4 /* 5 * Copyright (c) 1988, 1993, 1994 6 * The Regents of the University of California. All rights reserved. 7 * 8 * This code is derived from software contributed to Berkeley by 9 * David Hitz of Auspex Systems Inc. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgment: 21 * This product includes software developed by the University of 22 * California, Berkeley and its contributors. 23 * 4. Neither the name of the University nor the names of its contributors 24 * may be used to endorse or promote products derived from this software 25 * without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 30 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 37 * SUCH DAMAGE. 38 */ 39 40 #ifndef lint 41 static char copyright[] = 42 "@(#) Copyright (c) 1988, 1993, 1994\n\ 43 The Regents of the University of California. All rights reserved.\n"; 44 #endif /* not lint */ 45 46 #ifndef lint 47 #if 0 48 static char sccsid[] = "@(#)cp.c 8.5 (Berkeley) 4/29/95"; 49 #else 50 static char rcsid[] = "$OpenBSD: cp.c,v 1.17 2001/06/25 04:35:31 art Exp $"; 51 #endif 52 #endif /* not lint */ 53 54 /* 55 * Cp copies source files to target files. 56 * 57 * The global PATH_T structure "to" always contains the path to the 58 * current target file. Since fts(3) does not change directories, 59 * this path can be either absolute or dot-relative. 60 * 61 * The basic algorithm is to initialize "to" and use fts(3) to traverse 62 * the file hierarchy rooted in the argument list. A trivial case is the 63 * case of 'cp file1 file2'. The more interesting case is the case of 64 * 'cp file1 file2 ... fileN dir' where the hierarchy is traversed and the 65 * path (relative to the root of the traversal) is appended to dir (stored 66 * in "to") to form the final target path. 67 */ 68 69 #include <sys/param.h> 70 #include <sys/stat.h> 71 #include <sys/mman.h> 72 #include <sys/time.h> 73 74 #include <dirent.h> 75 #include <err.h> 76 #include <errno.h> 77 #include <fcntl.h> 78 #include <fts.h> 79 #include <locale.h> 80 #include <stdio.h> 81 #include <stdlib.h> 82 #include <string.h> 83 #include <unistd.h> 84 85 #include "extern.h" 86 87 #define STRIP_TRAILING_SLASH(p) { \ 88 while ((p).p_end > (p).p_path + 1 && (p).p_end[-1] == '/') \ 89 *--(p).p_end = '\0'; \ 90 } 91 92 PATH_T to = { to.p_path, "" }; 93 94 uid_t myuid; 95 int Rflag, fflag, iflag, pflag, rflag; 96 int myumask; 97 98 enum op { FILE_TO_FILE, FILE_TO_DIR, DIR_TO_DNE }; 99 100 int copy __P((char *[], enum op, int)); 101 int mastercmp __P((const FTSENT **, const FTSENT **)); 102 char *find_last_component __P((char *)); 103 104 int 105 main(argc, argv) 106 int argc; 107 char *argv[]; 108 { 109 struct stat to_stat, tmp_stat; 110 enum op type; 111 int Hflag, Lflag, Pflag, ch, fts_options, r; 112 char *target; 113 114 (void)setlocale(LC_ALL, ""); 115 116 Hflag = Lflag = Pflag = Rflag = 0; 117 while ((ch = getopt(argc, argv, "HLPRfipr")) != -1) 118 switch (ch) { 119 case 'H': 120 Hflag = 1; 121 Lflag = Pflag = 0; 122 break; 123 case 'L': 124 Lflag = 1; 125 Hflag = Pflag = 0; 126 break; 127 case 'P': 128 Pflag = 1; 129 Hflag = Lflag = 0; 130 break; 131 case 'R': 132 Rflag = 1; 133 break; 134 case 'f': 135 fflag = 1; 136 iflag = 0; 137 break; 138 case 'i': 139 iflag = isatty(fileno(stdin)); 140 fflag = 0; 141 break; 142 case 'p': 143 pflag = 1; 144 break; 145 case 'r': 146 rflag = 1; 147 break; 148 default: 149 usage(); 150 break; 151 } 152 argc -= optind; 153 argv += optind; 154 155 if (argc < 2) 156 usage(); 157 158 fts_options = FTS_NOCHDIR | FTS_PHYSICAL; 159 if (rflag) { 160 if (Rflag) 161 errx(1, 162 "the -R and -r options may not be specified together."); 163 if (Hflag || Lflag || Pflag) 164 errx(1, 165 "the -H, -L, and -P options may not be specified with the -r option."); 166 fts_options &= ~FTS_PHYSICAL; 167 fts_options |= FTS_LOGICAL; 168 } 169 if (Rflag) { 170 if (Hflag) 171 fts_options |= FTS_COMFOLLOW; 172 if (Lflag) { 173 fts_options &= ~FTS_PHYSICAL; 174 fts_options |= FTS_LOGICAL; 175 } 176 } else { 177 fts_options &= ~FTS_PHYSICAL; 178 fts_options |= FTS_LOGICAL; 179 } 180 181 myuid = getuid(); 182 183 /* Copy the umask for explicit mode setting. */ 184 myumask = umask(0); 185 (void)umask(myumask); 186 187 /* Save the target base in "to". */ 188 target = argv[--argc]; 189 if (strlen(target) >= sizeof(to.p_path)) 190 errx(1, "%s: name too long", target); 191 (void)strcpy(to.p_path, target); 192 to.p_end = to.p_path + strlen(to.p_path); 193 if (to.p_path == to.p_end) { 194 *to.p_end++ = '.'; 195 *to.p_end = '\0'; 196 } 197 to.target_end = to.p_end; 198 199 /* Set end of argument list for fts(3). */ 200 argv[argc] = NULL; 201 202 /* 203 * Cp has two distinct cases: 204 * 205 * cp [-R] source target 206 * cp [-R] source1 ... sourceN directory 207 * 208 * In both cases, source can be either a file or a directory. 209 * 210 * In (1), the target becomes a copy of the source. That is, if the 211 * source is a file, the target will be a file, and likewise for 212 * directories. 213 * 214 * In (2), the real target is not directory, but "directory/source". 215 */ 216 r = stat(to.p_path, &to_stat); 217 if (r == -1 && errno != ENOENT) 218 err(1, "%s", to.p_path); 219 if (r == -1 || !S_ISDIR(to_stat.st_mode)) { 220 /* 221 * Case (1). Target is not a directory. 222 */ 223 if (argc > 1) 224 usage(); 225 /* 226 * Need to detect the case: 227 * cp -R dir foo 228 * Where dir is a directory and foo does not exist, where 229 * we want pathname concatenations turned on but not for 230 * the initial mkdir(). 231 */ 232 if (r == -1) { 233 if (rflag || (Rflag && (Lflag || Hflag))) 234 stat(*argv, &tmp_stat); 235 else 236 lstat(*argv, &tmp_stat); 237 238 if (S_ISDIR(tmp_stat.st_mode) && (Rflag || rflag)) 239 type = DIR_TO_DNE; 240 else 241 type = FILE_TO_FILE; 242 } else 243 type = FILE_TO_FILE; 244 } else 245 /* 246 * Case (2). Target is a directory. 247 */ 248 type = FILE_TO_DIR; 249 250 exit (copy(argv, type, fts_options)); 251 } 252 253 char * 254 find_last_component(path) 255 char *path; 256 257 { 258 char *p; 259 260 if ((p = strrchr(path, '/')) == NULL) 261 p = path; 262 else { 263 /* Special case foo/ */ 264 if (!*(p+1)) { 265 while ((p >= path) && 266 *p == '/') 267 p--; 268 269 while ((p >= path) && 270 *p != '/') 271 p--; 272 } 273 274 p++; 275 } 276 277 return (p); 278 } 279 280 int 281 copy(argv, type, fts_options) 282 char *argv[]; 283 enum op type; 284 int fts_options; 285 { 286 struct stat to_stat; 287 FTS *ftsp; 288 FTSENT *curr; 289 int base, dne, nlen, rval; 290 char *p, *target_mid; 291 #ifdef lint 292 base = 0; 293 #endif 294 if ((ftsp = fts_open(argv, fts_options, mastercmp)) == NULL) 295 err(1, NULL); 296 for (rval = 0; (curr = fts_read(ftsp)) != NULL;) { 297 switch (curr->fts_info) { 298 case FTS_NS: 299 case FTS_ERR: 300 warnx("%s: %s", 301 curr->fts_path, strerror(curr->fts_errno)); 302 rval = 1; 303 continue; 304 case FTS_DC: 305 warnx("%s: directory causes a cycle", curr->fts_path); 306 rval = 1; 307 continue; 308 } 309 310 /* 311 * If we are in case (2) or (3) above, we need to append the 312 * source name to the target name. 313 */ 314 if (type != FILE_TO_FILE) { 315 /* 316 * Need to remember the roots of traversals to create 317 * correct pathnames. If there's a directory being 318 * copied to a non-existent directory, e.g. 319 * cp -R a/dir noexist 320 * the resulting path name should be noexist/foo, not 321 * noexist/dir/foo (where foo is a file in dir), which 322 * is the case where the target exists. 323 * 324 * Also, check for "..". This is for correct path 325 * concatenation for paths ending in "..", e.g. 326 * cp -R .. /tmp 327 * Paths ending in ".." are changed to ".". This is 328 * tricky, but seems the easiest way to fix the problem. 329 * 330 * XXX 331 * Since the first level MUST be FTS_ROOTLEVEL, base 332 * is always initialized. 333 */ 334 if (curr->fts_level == FTS_ROOTLEVEL) { 335 if (type != DIR_TO_DNE) { 336 p = find_last_component(curr->fts_path); 337 base = p - curr->fts_path; 338 339 if (!strcmp(&curr->fts_path[base], 340 "..")) 341 base += 1; 342 } else 343 base = curr->fts_pathlen; 344 } 345 346 p = &curr->fts_path[base]; 347 nlen = curr->fts_pathlen - base; 348 target_mid = to.target_end; 349 if (*p != '/' && target_mid[-1] != '/') 350 *target_mid++ = '/'; 351 *target_mid = '\0'; 352 if (target_mid - to.p_path + nlen >= MAXPATHLEN) { 353 warnx("%s%s: name too long (not copied)", 354 to.p_path, p); 355 rval = 1; 356 continue; 357 } 358 (void)strncat(target_mid, p, nlen); 359 to.p_end = target_mid + nlen; 360 *to.p_end = '\0'; 361 } 362 363 /* Not an error but need to remember it happened */ 364 if (stat(to.p_path, &to_stat) == -1) { 365 if (curr->fts_info == FTS_DP) 366 continue; 367 dne = 1; 368 } else { 369 /* 370 * For -p mode, we need to reset the directory 371 * times in the post-order pass since the times 372 * will have been changed when we added files to 373 * the directory in the pre-order pass. 374 */ 375 if (curr->fts_info == FTS_DP) { 376 if (pflag && S_ISDIR(to_stat.st_mode)) { 377 struct timeval tv[2]; 378 379 TIMESPEC_TO_TIMEVAL(&tv[0], 380 &curr->fts_statp->st_atimespec); 381 TIMESPEC_TO_TIMEVAL(&tv[1], 382 &curr->fts_statp->st_mtimespec); 383 if (utimes(to.p_path, tv)) 384 warn("utimes: %s", to.p_path); 385 } 386 continue; 387 } 388 if (to_stat.st_dev == curr->fts_statp->st_dev && 389 to_stat.st_ino == curr->fts_statp->st_ino) { 390 warnx("%s and %s are identical (not copied).", 391 to.p_path, curr->fts_path); 392 rval = 1; 393 if (S_ISDIR(curr->fts_statp->st_mode)) 394 (void)fts_set(ftsp, curr, FTS_SKIP); 395 continue; 396 } 397 if (!S_ISDIR(curr->fts_statp->st_mode) && 398 S_ISDIR(to_stat.st_mode)) { 399 warnx("cannot overwrite directory %s with non-directory %s", 400 to.p_path, curr->fts_path); 401 rval = 1; 402 continue; 403 } 404 dne = 0; 405 } 406 407 switch (curr->fts_statp->st_mode & S_IFMT) { 408 case S_IFLNK: 409 if (copy_link(curr, !dne)) 410 rval = 1; 411 break; 412 case S_IFDIR: 413 if (!Rflag && !rflag) { 414 warnx("%s is a directory (not copied).", 415 curr->fts_path); 416 (void)fts_set(ftsp, curr, FTS_SKIP); 417 rval = 1; 418 break; 419 } 420 /* 421 * If the directory doesn't exist, create the new 422 * one with the from file mode plus owner RWX bits, 423 * modified by the umask. Trade-off between being 424 * able to write the directory (if from directory is 425 * 555) and not causing a permissions race. If the 426 * umask blocks owner writes, we fail.. 427 */ 428 if (dne) { 429 if (mkdir(to.p_path, 430 curr->fts_statp->st_mode | S_IRWXU) < 0) 431 err(1, "%s", to.p_path); 432 } else if (!S_ISDIR(to_stat.st_mode)) { 433 errno = ENOTDIR; 434 err(1, "%s", to.p_path); 435 } 436 /* 437 * If not -p and directory didn't exist, set it to be 438 * the same as the from directory, unmodified by the 439 * umask; arguably wrong, but it's been that way 440 * forever. 441 */ 442 if (pflag && setfile(curr->fts_statp, 0)) 443 rval = 1; 444 else if (dne) 445 (void)chmod(to.p_path, 446 curr->fts_statp->st_mode); 447 break; 448 case S_IFBLK: 449 case S_IFCHR: 450 if (Rflag) { 451 if (copy_special(curr->fts_statp, !dne)) 452 rval = 1; 453 } else 454 if (copy_file(curr, dne)) 455 rval = 1; 456 break; 457 case S_IFIFO: 458 if (Rflag) { 459 if (copy_fifo(curr->fts_statp, !dne)) 460 rval = 1; 461 } else 462 if (copy_file(curr, dne)) 463 rval = 1; 464 break; 465 default: 466 if (copy_file(curr, dne)) 467 rval = 1; 468 break; 469 } 470 } 471 if (errno) 472 err(1, "fts_read"); 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 int 485 mastercmp(a, b) 486 const FTSENT **a, **b; 487 { 488 int a_info, b_info; 489 490 a_info = (*a)->fts_info; 491 if (a_info == FTS_ERR || a_info == FTS_NS || a_info == FTS_DNR) 492 return (0); 493 b_info = (*b)->fts_info; 494 if (b_info == FTS_ERR || b_info == FTS_NS || b_info == FTS_DNR) 495 return (0); 496 if (a_info == FTS_D) 497 return (-1); 498 if (b_info == FTS_D) 499 return (1); 500 return (0); 501 } 502