1 /* $OpenBSD: cp.c,v 1.35 2012/08/28 06:02:58 otto 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. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 /* 37 * Cp copies source files to target files. 38 * 39 * The global PATH_T structure "to" always contains the path to the 40 * current target file. Since fts(3) does not change directories, 41 * this path can be either absolute or dot-relative. 42 * 43 * The basic algorithm is to initialize "to" and use fts(3) to traverse 44 * the file hierarchy rooted in the argument list. A trivial case is the 45 * case of 'cp file1 file2'. The more interesting case is the case of 46 * 'cp file1 file2 ... fileN dir' where the hierarchy is traversed and the 47 * path (relative to the root of the traversal) is appended to dir (stored 48 * in "to") to form the final target path. 49 */ 50 51 #include <sys/param.h> 52 #include <sys/stat.h> 53 #include <sys/mman.h> 54 #include <sys/time.h> 55 56 #include <dirent.h> 57 #include <err.h> 58 #include <errno.h> 59 #include <fcntl.h> 60 #include <fts.h> 61 #include <locale.h> 62 #include <stdio.h> 63 #include <stdlib.h> 64 #include <string.h> 65 #include <unistd.h> 66 67 #include "extern.h" 68 69 #define fts_dne(_x) (_x->fts_pointer != NULL) 70 71 PATH_T to = { to.p_path, "" }; 72 73 uid_t myuid; 74 int Rflag, fflag, iflag, pflag, rflag; 75 mode_t myumask; 76 77 enum op { FILE_TO_FILE, FILE_TO_DIR, DIR_TO_DNE }; 78 79 int copy(char *[], enum op, int); 80 char *find_last_component(char *); 81 82 int 83 main(int argc, char *argv[]) 84 { 85 struct stat to_stat, tmp_stat; 86 enum op type; 87 int Hflag, Lflag, Pflag, ch, fts_options, r; 88 char *target; 89 90 (void)setlocale(LC_ALL, ""); 91 92 Hflag = Lflag = Pflag = Rflag = 0; 93 while ((ch = getopt(argc, argv, "HLPRfipr")) != -1) 94 switch (ch) { 95 case 'H': 96 Hflag = 1; 97 Lflag = Pflag = 0; 98 break; 99 case 'L': 100 Lflag = 1; 101 Hflag = Pflag = 0; 102 break; 103 case 'P': 104 Pflag = 1; 105 Hflag = Lflag = 0; 106 break; 107 case 'R': 108 Rflag = 1; 109 break; 110 case 'f': 111 fflag = 1; 112 iflag = 0; 113 break; 114 case 'i': 115 iflag = isatty(STDIN_FILENO); 116 fflag = 0; 117 break; 118 case 'p': 119 pflag = 1; 120 break; 121 case 'r': 122 rflag = 1; 123 break; 124 default: 125 usage(); 126 break; 127 } 128 argc -= optind; 129 argv += optind; 130 131 if (argc < 2) 132 usage(); 133 134 fts_options = FTS_NOCHDIR | FTS_PHYSICAL; 135 if (rflag) { 136 if (Rflag) 137 errx(1, 138 "the -R and -r options may not be specified together."); 139 if (Hflag || Lflag || Pflag) 140 errx(1, 141 "the -H, -L, and -P options may not be specified with the -r option."); 142 fts_options &= ~FTS_PHYSICAL; 143 fts_options |= FTS_LOGICAL; 144 } 145 if (Rflag) { 146 if (Hflag) 147 fts_options |= FTS_COMFOLLOW; 148 if (Lflag) { 149 fts_options &= ~FTS_PHYSICAL; 150 fts_options |= FTS_LOGICAL; 151 } 152 } else { 153 fts_options &= ~FTS_PHYSICAL; 154 fts_options |= FTS_LOGICAL; 155 } 156 157 myuid = getuid(); 158 159 /* Copy the umask for explicit mode setting. */ 160 myumask = umask(0); 161 (void)umask(myumask); 162 163 /* Save the target base in "to". */ 164 target = argv[--argc]; 165 if (strlcpy(to.p_path, target, sizeof to.p_path) >= sizeof(to.p_path)) 166 errx(1, "%s: name too long", target); 167 to.p_end = to.p_path + strlen(to.p_path); 168 if (to.p_path == to.p_end) { 169 *to.p_end++ = '.'; 170 *to.p_end = '\0'; 171 } 172 to.target_end = to.p_end; 173 174 /* Set end of argument list for fts(3). */ 175 argv[argc] = NULL; 176 177 /* 178 * Cp has two distinct cases: 179 * 180 * cp [-R] source target 181 * cp [-R] source1 ... sourceN directory 182 * 183 * In both cases, source can be either a file or a directory. 184 * 185 * In (1), the target becomes a copy of the source. That is, if the 186 * source is a file, the target will be a file, and likewise for 187 * directories. 188 * 189 * In (2), the real target is not directory, but "directory/source". 190 */ 191 r = stat(to.p_path, &to_stat); 192 if (r == -1 && errno != ENOENT) 193 err(1, "%s", to.p_path); 194 if (r == -1 || !S_ISDIR(to_stat.st_mode)) { 195 /* 196 * Case (1). Target is not a directory. 197 */ 198 if (argc > 1) 199 usage(); 200 /* 201 * Need to detect the case: 202 * cp -R dir foo 203 * Where dir is a directory and foo does not exist, where 204 * we want pathname concatenations turned on but not for 205 * the initial mkdir(). 206 */ 207 if (r == -1) { 208 if (rflag || (Rflag && (Lflag || Hflag))) 209 stat(*argv, &tmp_stat); 210 else 211 lstat(*argv, &tmp_stat); 212 213 if (S_ISDIR(tmp_stat.st_mode) && (Rflag || rflag)) 214 type = DIR_TO_DNE; 215 else 216 type = FILE_TO_FILE; 217 } else 218 type = FILE_TO_FILE; 219 } else { 220 /* 221 * Case (2). Target is a directory. 222 */ 223 type = FILE_TO_DIR; 224 } 225 226 exit(copy(argv, type, fts_options)); 227 } 228 229 char * 230 find_last_component(char *path) 231 { 232 char *p; 233 234 if ((p = strrchr(path, '/')) == NULL) 235 p = path; 236 else { 237 /* Special case foo/ */ 238 if (!*(p+1)) { 239 while ((p >= path) && *p == '/') 240 p--; 241 242 while ((p >= path) && *p != '/') 243 p--; 244 } 245 246 p++; 247 } 248 249 return (p); 250 } 251 252 int 253 copy(char *argv[], enum op type, int fts_options) 254 { 255 struct stat to_stat; 256 FTS *ftsp; 257 FTSENT *curr; 258 int base, nlen, rval; 259 char *p, *target_mid; 260 base = 0; 261 262 if ((ftsp = fts_open(argv, fts_options, NULL)) == NULL) 263 err(1, NULL); 264 for (rval = 0; (curr = fts_read(ftsp)) != NULL;) { 265 switch (curr->fts_info) { 266 case FTS_NS: 267 case FTS_DNR: 268 case FTS_ERR: 269 warnx("%s: %s", 270 curr->fts_path, strerror(curr->fts_errno)); 271 rval = 1; 272 continue; 273 case FTS_DC: 274 warnx("%s: directory causes a cycle", curr->fts_path); 275 rval = 1; 276 continue; 277 } 278 279 /* 280 * If we are in case (2) or (3) above, we need to append the 281 * source name to the target name. 282 */ 283 if (type != FILE_TO_FILE) { 284 /* 285 * Need to remember the roots of traversals to create 286 * correct pathnames. If there's a directory being 287 * copied to a non-existent directory, e.g. 288 * cp -R a/dir noexist 289 * the resulting path name should be noexist/foo, not 290 * noexist/dir/foo (where foo is a file in dir), which 291 * is the case where the target exists. 292 * 293 * Also, check for "..". This is for correct path 294 * concatenation for paths ending in "..", e.g. 295 * cp -R .. /tmp 296 * Paths ending in ".." are changed to ".". This is 297 * tricky, but seems the easiest way to fix the problem. 298 * 299 * XXX 300 * Since the first level MUST be FTS_ROOTLEVEL, base 301 * is always initialized. 302 */ 303 if (curr->fts_level == FTS_ROOTLEVEL) { 304 if (type != DIR_TO_DNE) { 305 p = find_last_component(curr->fts_path); 306 base = p - curr->fts_path; 307 308 if (!strcmp(&curr->fts_path[base], 309 "..")) 310 base += 1; 311 } else 312 base = curr->fts_pathlen; 313 } 314 315 p = &curr->fts_path[base]; 316 nlen = curr->fts_pathlen - base; 317 target_mid = to.target_end; 318 if (*p != '/' && target_mid[-1] != '/') 319 *target_mid++ = '/'; 320 *target_mid = '\0'; 321 if (target_mid - to.p_path + nlen >= MAXPATHLEN) { 322 warnx("%s%s: name too long (not copied)", 323 to.p_path, p); 324 rval = 1; 325 continue; 326 } 327 (void)strncat(target_mid, p, nlen); 328 to.p_end = target_mid + nlen; 329 *to.p_end = '\0'; 330 } 331 332 /* Not an error but need to remember it happened */ 333 if (stat(to.p_path, &to_stat) == -1) { 334 if (curr->fts_info == FTS_DP) 335 continue; 336 /* 337 * We use fts_pointer as a boolean to indicate that 338 * we created this directory ourselves. We'll use 339 * this later on via the fts_dne macro to decide 340 * whether or not to set the directory mode during 341 * the post-order pass. 342 */ 343 curr->fts_pointer = (void *)1; 344 } else { 345 /* 346 * Set directory mode/user/times on the post-order 347 * pass. We can't do this earlier because the mode 348 * may not allow us write permission. Furthermore, 349 * if we set the times during the pre-order pass, 350 * they will get changed later when the directory 351 * is populated. 352 */ 353 if (curr->fts_info == FTS_DP) { 354 if (!S_ISDIR(to_stat.st_mode)) 355 continue; 356 /* 357 * If not -p and directory didn't exist, set 358 * it to be the same as the from directory, 359 * unmodified by the umask; arguably wrong, 360 * but it's been that way forever. 361 */ 362 if (pflag && setfile(curr->fts_statp, 0)) 363 rval = 1; 364 else if (fts_dne(curr)) 365 (void)chmod(to.p_path, 366 curr->fts_statp->st_mode); 367 continue; 368 } 369 if (to_stat.st_dev == curr->fts_statp->st_dev && 370 to_stat.st_ino == curr->fts_statp->st_ino) { 371 warnx("%s and %s are identical (not copied).", 372 to.p_path, curr->fts_path); 373 rval = 1; 374 if (S_ISDIR(curr->fts_statp->st_mode)) 375 (void)fts_set(ftsp, curr, FTS_SKIP); 376 continue; 377 } 378 if (!S_ISDIR(curr->fts_statp->st_mode) && 379 S_ISDIR(to_stat.st_mode)) { 380 warnx("cannot overwrite directory %s with non-directory %s", 381 to.p_path, curr->fts_path); 382 rval = 1; 383 continue; 384 } 385 } 386 387 switch (curr->fts_statp->st_mode & S_IFMT) { 388 case S_IFLNK: 389 if (copy_link(curr, !fts_dne(curr))) 390 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 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 (fts_dne(curr)) { 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 break; 417 case S_IFBLK: 418 case S_IFCHR: 419 if (Rflag) { 420 if (copy_special(curr->fts_statp, !fts_dne(curr))) 421 rval = 1; 422 } else 423 if (copy_file(curr, fts_dne(curr))) 424 rval = 1; 425 break; 426 case S_IFIFO: 427 if (Rflag) { 428 if (copy_fifo(curr->fts_statp, !fts_dne(curr))) 429 rval = 1; 430 } else 431 if (copy_file(curr, fts_dne(curr))) 432 rval = 1; 433 break; 434 case S_IFSOCK: 435 warnx("%s: %s", curr->fts_path, strerror(EOPNOTSUPP)); 436 break; 437 default: 438 if (copy_file(curr, fts_dne(curr))) 439 rval = 1; 440 break; 441 } 442 } 443 if (errno) 444 err(1, "fts_read"); 445 (void)fts_close(ftsp); 446 return (rval); 447 } 448