1 /* $NetBSD: cp.c,v 1.32 2002/12/16 14:44:14 jrf Exp $ */ 2 3 /* 4 * Copyright (c) 1988, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * David Hitz of Auspex Systems Inc. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 */ 38 39 #include <sys/cdefs.h> 40 #ifndef lint 41 __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 __RCSID("$NetBSD: cp.c,v 1.32 2002/12/16 14:44:14 jrf 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 72 #include <err.h> 73 #include <errno.h> 74 #include <fts.h> 75 #include <locale.h> 76 #include <stdlib.h> 77 #include <stdio.h> 78 #include <string.h> 79 #include <unistd.h> 80 81 #include "extern.h" 82 83 #define STRIP_TRAILING_SLASH(p) { \ 84 while ((p).p_end > (p).p_path + 1 && (p).p_end[-1] == '/') \ 85 *--(p).p_end = '\0'; \ 86 } 87 88 PATH_T to = { to.p_path, "" }; 89 90 uid_t myuid; 91 int Rflag, fflag, iflag, pflag, rflag, vflag; 92 mode_t myumask; 93 94 enum op { FILE_TO_FILE, FILE_TO_DIR, DIR_TO_DNE }; 95 96 int main(int, char *[]); 97 int copy(char *[], enum op, int); 98 int mastercmp(const FTSENT **, const FTSENT **); 99 100 int 101 main(int argc, char *argv[]) 102 { 103 struct stat to_stat, tmp_stat; 104 enum op type; 105 int Hflag, Lflag, Pflag, ch, fts_options, r; 106 char *target; 107 108 (void)setlocale(LC_ALL, ""); 109 110 Hflag = Lflag = Pflag = Rflag = 0; 111 while ((ch = getopt(argc, argv, "HLPRfiprv")) != -1) 112 switch (ch) { 113 case 'H': 114 Hflag = 1; 115 Lflag = Pflag = 0; 116 break; 117 case 'L': 118 Lflag = 1; 119 Hflag = Pflag = 0; 120 break; 121 case 'P': 122 Pflag = 1; 123 Hflag = Lflag = 0; 124 break; 125 case 'R': 126 Rflag = 1; 127 break; 128 case 'f': 129 fflag = 1; 130 iflag = 0; 131 break; 132 case 'i': 133 iflag = isatty(fileno(stdin)); 134 fflag = 0; 135 break; 136 case 'p': 137 pflag = 1; 138 break; 139 case 'r': 140 rflag = 1; 141 break; 142 case 'v': 143 vflag = 1; 144 break; 145 case '?': 146 default: 147 usage(); 148 break; 149 } 150 argc -= optind; 151 argv += optind; 152 153 if (argc < 2) 154 usage(); 155 156 fts_options = FTS_NOCHDIR | FTS_PHYSICAL; 157 if (rflag) { 158 if (Rflag) 159 errx(1, 160 "the -R and -r options may not be specified together."); 161 if (Hflag || Lflag || Pflag) 162 errx(1, 163 "the -H, -L, and -P options may not be specified with the -r option."); 164 fts_options &= ~FTS_PHYSICAL; 165 fts_options |= FTS_LOGICAL; 166 } 167 if (Rflag) { 168 if (Hflag) 169 fts_options |= FTS_COMFOLLOW; 170 if (Lflag) { 171 fts_options &= ~FTS_PHYSICAL; 172 fts_options |= FTS_LOGICAL; 173 } 174 } else { 175 fts_options &= ~FTS_PHYSICAL; 176 fts_options |= FTS_LOGICAL | FTS_COMFOLLOW; 177 } 178 179 myuid = getuid(); 180 181 /* Copy the umask for explicit mode setting. */ 182 myumask = umask(0); 183 (void)umask(myumask); 184 185 /* Save the target base in "to". */ 186 target = argv[--argc]; 187 if (strlen(target) > MAXPATHLEN) 188 errx(1, "%s: name too long", target); 189 (void)strcpy(to.p_path, target); 190 to.p_end = to.p_path + strlen(to.p_path); 191 if (to.p_path == to.p_end) { 192 *to.p_end++ = '.'; 193 *to.p_end = 0; 194 } 195 STRIP_TRAILING_SLASH(to); 196 to.target_end = to.p_end; 197 198 /* Set end of argument list for fts(3). */ 199 argv[argc] = NULL; 200 201 /* 202 * Cp has two distinct cases: 203 * 204 * cp [-R] source target 205 * cp [-R] source1 ... sourceN directory 206 * 207 * In both cases, source can be either a file or a directory. 208 * 209 * In (1), the target becomes a copy of the source. That is, if the 210 * source is a file, the target will be a file, and likewise for 211 * directories. 212 * 213 * In (2), the real target is not directory, but "directory/source". 214 */ 215 r = stat(to.p_path, &to_stat); 216 if (r == -1 && errno != ENOENT) 217 err(1, "%s", to.p_path); 218 if (r == -1 || !S_ISDIR(to_stat.st_mode)) { 219 /* 220 * Case (1). Target is not a directory. 221 */ 222 if (argc > 1) { 223 usage(); 224 exit(1); 225 } 226 /* 227 * Need to detect the case: 228 * cp -R dir foo 229 * Where dir is a directory and foo does not exist, where 230 * we want pathname concatenations turned on but not for 231 * the initial mkdir(). 232 */ 233 if (r == -1) { 234 if (rflag || (Rflag && (Lflag || Hflag))) 235 r = stat(*argv, &tmp_stat); 236 else 237 r = lstat(*argv, &tmp_stat); 238 if (r == -1) 239 err(1, "%s", *argv); 240 241 if (S_ISDIR(tmp_stat.st_mode) && (Rflag || rflag)) 242 type = DIR_TO_DNE; 243 else 244 type = FILE_TO_FILE; 245 } else 246 type = FILE_TO_FILE; 247 } else { 248 /* 249 * Case (2). Target is a directory. 250 */ 251 type = FILE_TO_DIR; 252 } 253 254 exit(copy(argv, type, fts_options)); 255 /* NOTREACHED */ 256 } 257 258 int 259 copy(char *argv[], enum op type, int fts_options) 260 { 261 struct stat to_stat; 262 FTS *ftsp; 263 FTSENT *curr; 264 int base, dne, nlen, rval; 265 char *p, *tmp; 266 267 base = 0; /* XXX gcc -Wuninitialized (see comment below) */ 268 269 if ((ftsp = fts_open(argv, fts_options, mastercmp)) == NULL) 270 err(1, "%s", argv[0]); 271 for (rval = 0; (curr = fts_read(ftsp)) != NULL;) { 272 switch (curr->fts_info) { 273 case FTS_NS: 274 case FTS_DNR: 275 case FTS_ERR: 276 warnx("%s: %s", 277 curr->fts_path, strerror(curr->fts_errno)); 278 rval = 1; 279 continue; 280 case FTS_DC: /* Warn, continue. */ 281 warnx("%s: directory causes a cycle", curr->fts_path); 282 rval = 1; 283 continue; 284 } 285 286 /* 287 * If we are in case (2) or (3) above, we need to append the 288 * source name to the target name. 289 */ 290 if (type != FILE_TO_FILE) { 291 if ((curr->fts_namelen + 292 to.target_end - to.p_path + 1) > MAXPATHLEN) { 293 warnx("%s/%s: name too long (not copied)", 294 to.p_path, curr->fts_name); 295 rval = 1; 296 continue; 297 } 298 299 /* 300 * Need to remember the roots of traversals to create 301 * correct pathnames. If there's a directory being 302 * copied to a non-existent directory, e.g. 303 * cp -R a/dir noexist 304 * the resulting path name should be noexist/foo, not 305 * noexist/dir/foo (where foo is a file in dir), which 306 * is the case where the target exists. 307 * 308 * Also, check for "..". This is for correct path 309 * concatentation for paths ending in "..", e.g. 310 * cp -R .. /tmp 311 * Paths ending in ".." are changed to ".". This is 312 * tricky, but seems the easiest way to fix the problem. 313 * 314 * XXX 315 * Since the first level MUST be FTS_ROOTLEVEL, base 316 * is always initialized. 317 */ 318 if (curr->fts_level == FTS_ROOTLEVEL) { 319 if (type != DIR_TO_DNE) { 320 p = strrchr(curr->fts_path, '/'); 321 base = (p == NULL) ? 0 : 322 (int)(p - curr->fts_path + 1); 323 324 if (!strcmp(&curr->fts_path[base], 325 "..")) 326 base += 1; 327 } else 328 base = curr->fts_pathlen; 329 } 330 331 p = &curr->fts_path[base]; 332 nlen = curr->fts_pathlen - base; 333 334 tmp = to.target_end; 335 if (*p != '/' && *(tmp - 1) != '/') 336 *tmp++ = '/'; 337 *tmp = 0; 338 339 (void)strncat(tmp, p, nlen); 340 to.p_end = tmp + nlen; 341 *to.p_end = 0; 342 STRIP_TRAILING_SLASH(to); 343 } 344 345 /* Not an error but need to remember it happened */ 346 if (stat(to.p_path, &to_stat) == -1) 347 dne = 1; 348 else { 349 if (to_stat.st_dev == curr->fts_statp->st_dev && 350 to_stat.st_ino == curr->fts_statp->st_ino) { 351 warnx("%s and %s are identical (not copied).", 352 to.p_path, curr->fts_path); 353 rval = 1; 354 if (S_ISDIR(curr->fts_statp->st_mode)) 355 (void)fts_set(ftsp, curr, FTS_SKIP); 356 continue; 357 } 358 if (!S_ISDIR(curr->fts_statp->st_mode) && 359 S_ISDIR(to_stat.st_mode)) { 360 warnx("cannot overwrite directory %s with non-directory %s", 361 to.p_path, curr->fts_path); 362 rval = 1; 363 continue; 364 } 365 dne = 0; 366 } 367 368 switch (curr->fts_statp->st_mode & S_IFMT) { 369 case S_IFLNK: 370 /* Catch special case of a non dangling symlink */ 371 if((fts_options & FTS_LOGICAL) || 372 ((fts_options & FTS_COMFOLLOW) && curr->fts_level == 0)) { 373 if (copy_file(curr, dne)) 374 rval = 1; 375 } else { 376 if (copy_link(curr, !dne)) 377 rval = 1; 378 } 379 break; 380 case S_IFDIR: 381 if (!Rflag && !rflag) { 382 if (curr->fts_info == FTS_D) 383 warnx("%s is a directory (not copied).", 384 curr->fts_path); 385 (void)fts_set(ftsp, curr, FTS_SKIP); 386 rval = 1; 387 break; 388 } 389 390 /* 391 * Directories get noticed twice: 392 * In the first pass, create it if needed. 393 * In the second pass, after the children have been copied, set the permissions. 394 */ 395 if (curr->fts_info == FTS_D) /* First pass */ 396 { 397 /* 398 * If the directory doesn't exist, create the new 399 * one with the from file mode plus owner RWX bits, 400 * modified by the umask. Trade-off between being 401 * able to write the directory (if from directory is 402 * 555) and not causing a permissions race. If the 403 * umask blocks owner writes, we fail.. 404 */ 405 if (dne) { 406 if (mkdir(to.p_path, 407 curr->fts_statp->st_mode | S_IRWXU) < 0) 408 err(1, "%s", to.p_path); 409 } else if (!S_ISDIR(to_stat.st_mode)) { 410 errno = ENOTDIR; 411 err(1, "%s", to.p_path); 412 } 413 } 414 else if (curr->fts_info == FTS_DP) /* Second pass */ 415 { 416 /* 417 * If not -p and directory didn't exist, set it to be 418 * the same as the from directory, umodified by the 419 * umask; arguably wrong, but it's been that way 420 * forever. 421 */ 422 if (pflag && setfile(curr->fts_statp, 0)) 423 rval = 1; 424 else if (dne) 425 (void)chmod(to.p_path, 426 curr->fts_statp->st_mode); 427 } 428 else 429 { 430 warnx("directory %s encountered when not expected.", curr->fts_path); 431 rval = 1; 432 break; 433 } 434 435 break; 436 case S_IFBLK: 437 case S_IFCHR: 438 if (Rflag) { 439 if (copy_special(curr->fts_statp, !dne)) 440 rval = 1; 441 } else 442 if (copy_file(curr, dne)) 443 rval = 1; 444 break; 445 case S_IFIFO: 446 if (Rflag) { 447 if (copy_fifo(curr->fts_statp, !dne)) 448 rval = 1; 449 } else 450 if (copy_file(curr, dne)) 451 rval = 1; 452 break; 453 default: 454 if (copy_file(curr, dne)) 455 rval = 1; 456 break; 457 } 458 if (vflag) 459 (void)printf("%s -> %s\n", curr->fts_path, to.p_path); 460 } 461 if (errno) 462 err(1, "fts_read"); 463 return (rval); 464 } 465 466 /* 467 * mastercmp -- 468 * The comparison function for the copy order. The order is to copy 469 * non-directory files before directory files. The reason for this 470 * is because files tend to be in the same cylinder group as their 471 * parent directory, whereas directories tend not to be. Copying the 472 * files first reduces seeking. 473 */ 474 int 475 mastercmp(const FTSENT **a, const FTSENT **b) 476 { 477 int a_info, b_info; 478 479 a_info = (*a)->fts_info; 480 if (a_info == FTS_ERR || a_info == FTS_NS || a_info == FTS_DNR) 481 return (0); 482 b_info = (*b)->fts_info; 483 if (b_info == FTS_ERR || b_info == FTS_NS || b_info == FTS_DNR) 484 return (0); 485 if (a_info == FTS_D) 486 return (-1); 487 if (b_info == FTS_D) 488 return (1); 489 return (0); 490 } 491