1 /* $NetBSD: cp.c,v 1.31 2001/09/13 09:53:59 wiz 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 1.31 2001/09/13 09:53:59 wiz 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; 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, "HLPRfipr")) != -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 '?': 143 default: 144 usage(); 145 break; 146 } 147 argc -= optind; 148 argv += optind; 149 150 if (argc < 2) 151 usage(); 152 153 fts_options = FTS_NOCHDIR | FTS_PHYSICAL; 154 if (rflag) { 155 if (Rflag) 156 errx(1, 157 "the -R and -r options may not be specified together."); 158 if (Hflag || Lflag || Pflag) 159 errx(1, 160 "the -H, -L, and -P options may not be specified with the -r option."); 161 fts_options &= ~FTS_PHYSICAL; 162 fts_options |= FTS_LOGICAL; 163 } 164 if (Rflag) { 165 if (Hflag) 166 fts_options |= FTS_COMFOLLOW; 167 if (Lflag) { 168 fts_options &= ~FTS_PHYSICAL; 169 fts_options |= FTS_LOGICAL; 170 } 171 } else { 172 fts_options &= ~FTS_PHYSICAL; 173 fts_options |= FTS_LOGICAL | FTS_COMFOLLOW; 174 } 175 176 myuid = getuid(); 177 178 /* Copy the umask for explicit mode setting. */ 179 myumask = umask(0); 180 (void)umask(myumask); 181 182 /* Save the target base in "to". */ 183 target = argv[--argc]; 184 if (strlen(target) > MAXPATHLEN) 185 errx(1, "%s: name too long", target); 186 (void)strcpy(to.p_path, target); 187 to.p_end = to.p_path + strlen(to.p_path); 188 if (to.p_path == to.p_end) { 189 *to.p_end++ = '.'; 190 *to.p_end = 0; 191 } 192 STRIP_TRAILING_SLASH(to); 193 to.target_end = to.p_end; 194 195 /* Set end of argument list for fts(3). */ 196 argv[argc] = NULL; 197 198 /* 199 * Cp has two distinct cases: 200 * 201 * cp [-R] source target 202 * cp [-R] source1 ... sourceN directory 203 * 204 * In both cases, source can be either a file or a directory. 205 * 206 * In (1), the target becomes a copy of the source. That is, if the 207 * source is a file, the target will be a file, and likewise for 208 * directories. 209 * 210 * In (2), the real target is not directory, but "directory/source". 211 */ 212 r = stat(to.p_path, &to_stat); 213 if (r == -1 && errno != ENOENT) 214 err(1, "%s", to.p_path); 215 if (r == -1 || !S_ISDIR(to_stat.st_mode)) { 216 /* 217 * Case (1). Target is not a directory. 218 */ 219 if (argc > 1) { 220 usage(); 221 exit(1); 222 } 223 /* 224 * Need to detect the case: 225 * cp -R dir foo 226 * Where dir is a directory and foo does not exist, where 227 * we want pathname concatenations turned on but not for 228 * the initial mkdir(). 229 */ 230 if (r == -1) { 231 if (rflag || (Rflag && (Lflag || Hflag))) 232 r = stat(*argv, &tmp_stat); 233 else 234 r = lstat(*argv, &tmp_stat); 235 if (r == -1) 236 err(1, "%s", *argv); 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 } 250 251 exit(copy(argv, type, fts_options)); 252 /* NOTREACHED */ 253 } 254 255 int 256 copy(char *argv[], enum op type, int fts_options) 257 { 258 struct stat to_stat; 259 FTS *ftsp; 260 FTSENT *curr; 261 int base, dne, nlen, rval; 262 char *p, *tmp; 263 264 base = 0; /* XXX gcc -Wuninitialized (see comment below) */ 265 266 if ((ftsp = fts_open(argv, fts_options, mastercmp)) == NULL) 267 err(1, "%s", argv[0]); 268 for (rval = 0; (curr = fts_read(ftsp)) != NULL;) { 269 switch (curr->fts_info) { 270 case FTS_NS: 271 case FTS_DNR: 272 case FTS_ERR: 273 warnx("%s: %s", 274 curr->fts_path, strerror(curr->fts_errno)); 275 rval = 1; 276 continue; 277 case FTS_DC: /* Warn, continue. */ 278 warnx("%s: directory causes a cycle", curr->fts_path); 279 rval = 1; 280 continue; 281 } 282 283 /* 284 * If we are in case (2) or (3) above, we need to append the 285 * source name to the target name. 286 */ 287 if (type != FILE_TO_FILE) { 288 if ((curr->fts_namelen + 289 to.target_end - to.p_path + 1) > MAXPATHLEN) { 290 warnx("%s/%s: name too long (not copied)", 291 to.p_path, curr->fts_name); 292 rval = 1; 293 continue; 294 } 295 296 /* 297 * Need to remember the roots of traversals to create 298 * correct pathnames. If there's a directory being 299 * copied to a non-existent directory, e.g. 300 * cp -R a/dir noexist 301 * the resulting path name should be noexist/foo, not 302 * noexist/dir/foo (where foo is a file in dir), which 303 * is the case where the target exists. 304 * 305 * Also, check for "..". This is for correct path 306 * concatentation for paths ending in "..", e.g. 307 * cp -R .. /tmp 308 * Paths ending in ".." are changed to ".". This is 309 * tricky, but seems the easiest way to fix the problem. 310 * 311 * XXX 312 * Since the first level MUST be FTS_ROOTLEVEL, base 313 * is always initialized. 314 */ 315 if (curr->fts_level == FTS_ROOTLEVEL) { 316 if (type != DIR_TO_DNE) { 317 p = strrchr(curr->fts_path, '/'); 318 base = (p == NULL) ? 0 : 319 (int)(p - curr->fts_path + 1); 320 321 if (!strcmp(&curr->fts_path[base], 322 "..")) 323 base += 1; 324 } else 325 base = curr->fts_pathlen; 326 } 327 328 p = &curr->fts_path[base]; 329 nlen = curr->fts_pathlen - base; 330 331 tmp = to.target_end; 332 if (*p != '/' && *(tmp - 1) != '/') 333 *tmp++ = '/'; 334 *tmp = 0; 335 336 (void)strncat(tmp, p, nlen); 337 to.p_end = tmp + nlen; 338 *to.p_end = 0; 339 STRIP_TRAILING_SLASH(to); 340 } 341 342 /* Not an error but need to remember it happened */ 343 if (stat(to.p_path, &to_stat) == -1) 344 dne = 1; 345 else { 346 if (to_stat.st_dev == curr->fts_statp->st_dev && 347 to_stat.st_ino == curr->fts_statp->st_ino) { 348 warnx("%s and %s are identical (not copied).", 349 to.p_path, curr->fts_path); 350 rval = 1; 351 if (S_ISDIR(curr->fts_statp->st_mode)) 352 (void)fts_set(ftsp, curr, FTS_SKIP); 353 continue; 354 } 355 if (!S_ISDIR(curr->fts_statp->st_mode) && 356 S_ISDIR(to_stat.st_mode)) { 357 warnx("cannot overwrite directory %s with non-directory %s", 358 to.p_path, curr->fts_path); 359 rval = 1; 360 continue; 361 } 362 dne = 0; 363 } 364 365 switch (curr->fts_statp->st_mode & S_IFMT) { 366 case S_IFLNK: 367 /* Catch special case of a non dangling symlink */ 368 if((fts_options & FTS_LOGICAL) || 369 ((fts_options & FTS_COMFOLLOW) && curr->fts_level == 0)) { 370 if (copy_file(curr, dne)) 371 rval = 1; 372 } else { 373 if (copy_link(curr, !dne)) 374 rval = 1; 375 } 376 break; 377 case S_IFDIR: 378 if (!Rflag && !rflag) { 379 if (curr->fts_info == FTS_D) 380 warnx("%s is a directory (not copied).", 381 curr->fts_path); 382 (void)fts_set(ftsp, curr, FTS_SKIP); 383 rval = 1; 384 break; 385 } 386 387 /* 388 * Directories get noticed twice: 389 * In the first pass, create it if needed. 390 * In the second pass, after the children have been copied, set the permissions. 391 */ 392 if (curr->fts_info == FTS_D) /* First pass */ 393 { 394 /* 395 * If the directory doesn't exist, create the new 396 * one with the from file mode plus owner RWX bits, 397 * modified by the umask. Trade-off between being 398 * able to write the directory (if from directory is 399 * 555) and not causing a permissions race. If the 400 * umask blocks owner writes, we fail.. 401 */ 402 if (dne) { 403 if (mkdir(to.p_path, 404 curr->fts_statp->st_mode | S_IRWXU) < 0) 405 err(1, "%s", to.p_path); 406 } else if (!S_ISDIR(to_stat.st_mode)) { 407 errno = ENOTDIR; 408 err(1, "%s", to.p_path); 409 } 410 } 411 else if (curr->fts_info == FTS_DP) /* Second pass */ 412 { 413 /* 414 * If not -p and directory didn't exist, set it to be 415 * the same as the from directory, umodified by the 416 * umask; arguably wrong, but it's been that way 417 * forever. 418 */ 419 if (pflag && setfile(curr->fts_statp, 0)) 420 rval = 1; 421 else if (dne) 422 (void)chmod(to.p_path, 423 curr->fts_statp->st_mode); 424 } 425 else 426 { 427 warnx("directory %s encountered when not expected.", curr->fts_path); 428 rval = 1; 429 break; 430 } 431 432 break; 433 case S_IFBLK: 434 case S_IFCHR: 435 if (Rflag) { 436 if (copy_special(curr->fts_statp, !dne)) 437 rval = 1; 438 } else 439 if (copy_file(curr, dne)) 440 rval = 1; 441 break; 442 case S_IFIFO: 443 if (Rflag) { 444 if (copy_fifo(curr->fts_statp, !dne)) 445 rval = 1; 446 } else 447 if (copy_file(curr, dne)) 448 rval = 1; 449 break; 450 default: 451 if (copy_file(curr, dne)) 452 rval = 1; 453 break; 454 } 455 } 456 if (errno) 457 err(1, "fts_read"); 458 return (rval); 459 } 460 461 /* 462 * mastercmp -- 463 * The comparison function for the copy order. The order is to copy 464 * non-directory files before directory files. The reason for this 465 * is because files tend to be in the same cylinder group as their 466 * parent directory, whereas directories tend not to be. Copying the 467 * files first reduces seeking. 468 */ 469 int 470 mastercmp(const FTSENT **a, const FTSENT **b) 471 { 472 int a_info, b_info; 473 474 a_info = (*a)->fts_info; 475 if (a_info == FTS_ERR || a_info == FTS_NS || a_info == FTS_DNR) 476 return (0); 477 b_info = (*b)->fts_info; 478 if (b_info == FTS_ERR || b_info == FTS_NS || b_info == FTS_DNR) 479 return (0); 480 if (a_info == FTS_D) 481 return (-1); 482 if (b_info == FTS_D) 483 return (1); 484 return (0); 485 } 486