1 /* $OpenBSD: cp.c,v 1.53 2019/06/28 13:34:58 deraadt 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/types.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 <limits.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, vflag; 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 Hflag = Lflag = Pflag = Rflag = 0; 91 while ((ch = getopt(argc, argv, "HLPRafiprv")) != -1) 92 switch (ch) { 93 case 'H': 94 Hflag = 1; 95 Lflag = Pflag = 0; 96 break; 97 case 'L': 98 Lflag = 1; 99 Hflag = Pflag = 0; 100 break; 101 case 'P': 102 Pflag = 1; 103 Hflag = Lflag = 0; 104 break; 105 case 'R': 106 Rflag = 1; 107 break; 108 case 'a': 109 Rflag = 1; 110 pflag = 1; 111 Pflag = 1; 112 Hflag = Lflag = 0; 113 break; 114 case 'f': 115 fflag = 1; 116 iflag = 0; 117 break; 118 case 'i': 119 iflag = 1; 120 fflag = 0; 121 break; 122 case 'p': 123 pflag = 1; 124 break; 125 case 'r': 126 rflag = 1; 127 break; 128 case 'v': 129 vflag = 1; 130 break; 131 default: 132 usage(); 133 break; 134 } 135 argc -= optind; 136 argv += optind; 137 138 /* 139 * Unfortunately, -R will use mkfifo & mknod; 140 * -p will use fchown, fchmod, lchown, fchflags.. 141 */ 142 if (Rflag == 0 && pflag == 0) 143 if (pledge("stdio rpath wpath cpath fattr", NULL) == -1) 144 err(1, "pledge"); 145 146 if (argc < 2) 147 usage(); 148 149 fts_options = FTS_NOCHDIR | FTS_PHYSICAL; 150 if (rflag) { 151 if (Rflag) 152 errx(1, 153 "the -R and -r options may not be specified together."); 154 if (Hflag || Lflag || Pflag) 155 errx(1, 156 "the -H, -L, and -P options may not be specified with the -r option."); 157 fts_options &= ~FTS_PHYSICAL; 158 fts_options |= FTS_LOGICAL; 159 } 160 if (Rflag) { 161 if (Hflag) 162 fts_options |= FTS_COMFOLLOW; 163 if (Lflag) { 164 fts_options &= ~FTS_PHYSICAL; 165 fts_options |= FTS_LOGICAL; 166 } 167 } else { 168 fts_options &= ~FTS_PHYSICAL; 169 fts_options |= FTS_LOGICAL; 170 } 171 172 myuid = getuid(); 173 174 /* Copy the umask for explicit mode setting. */ 175 myumask = umask(0); 176 (void)umask(myumask); 177 178 /* Save the target base in "to". */ 179 target = argv[--argc]; 180 if (strlcpy(to.p_path, target, sizeof to.p_path) >= sizeof(to.p_path)) 181 errx(1, "%s: name too long", target); 182 to.p_end = to.p_path + strlen(to.p_path); 183 if (to.p_path == to.p_end) { 184 *to.p_end++ = '.'; 185 *to.p_end = '\0'; 186 } 187 to.target_end = to.p_end; 188 189 /* Set end of argument list for fts(3). */ 190 argv[argc] = NULL; 191 192 /* 193 * Cp has two distinct cases: 194 * 195 * cp [-R] source target 196 * cp [-R] source1 ... sourceN directory 197 * 198 * In both cases, source can be either a file or a directory. 199 * 200 * In (1), the target becomes a copy of the source. That is, if the 201 * source is a file, the target will be a file, and likewise for 202 * directories. 203 * 204 * In (2), the real target is not directory, but "directory/source". 205 */ 206 r = stat(to.p_path, &to_stat); 207 if (r == -1 && errno != ENOENT) 208 err(1, "%s", to.p_path); 209 if (r == -1 || !S_ISDIR(to_stat.st_mode)) { 210 /* 211 * Case (1). Target is not a directory. 212 */ 213 if (argc > 1) 214 usage(); 215 /* 216 * Need to detect the case: 217 * cp -R dir foo 218 * Where dir is a directory and foo does not exist, where 219 * we want pathname concatenations turned on but not for 220 * the initial mkdir(). 221 */ 222 if (r == -1) { 223 if (rflag || (Rflag && (Lflag || Hflag))) 224 stat(*argv, &tmp_stat); 225 else 226 lstat(*argv, &tmp_stat); 227 228 if (S_ISDIR(tmp_stat.st_mode) && (Rflag || rflag)) 229 type = DIR_TO_DNE; 230 else 231 type = FILE_TO_FILE; 232 } else 233 type = FILE_TO_FILE; 234 } else { 235 /* 236 * Case (2). Target is a directory. 237 */ 238 type = FILE_TO_DIR; 239 } 240 241 return (copy(argv, type, fts_options)); 242 } 243 244 char * 245 find_last_component(char *path) 246 { 247 char *p; 248 249 if ((p = strrchr(path, '/')) == NULL) 250 p = path; 251 else { 252 /* Special case foo/ */ 253 if (!*(p+1)) { 254 while ((p >= path) && *p == '/') 255 p--; 256 257 while ((p >= path) && *p != '/') 258 p--; 259 } 260 261 p++; 262 } 263 264 return (p); 265 } 266 267 int 268 copy(char *argv[], enum op type, int fts_options) 269 { 270 struct stat to_stat; 271 FTS *ftsp; 272 FTSENT *curr; 273 int base, cval, nlen, rval; 274 char *p, *target_mid; 275 base = 0; 276 277 if ((ftsp = fts_open(argv, fts_options, NULL)) == NULL) 278 err(1, NULL); 279 for (rval = 0; (curr = fts_read(ftsp)) != NULL;) { 280 switch (curr->fts_info) { 281 case FTS_NS: 282 case FTS_DNR: 283 case FTS_ERR: 284 warnx("%s: %s", 285 curr->fts_path, strerror(curr->fts_errno)); 286 rval = 1; 287 continue; 288 case FTS_DC: 289 warnx("%s: directory causes a cycle", curr->fts_path); 290 rval = 1; 291 continue; 292 } 293 294 /* 295 * If we are in case (2) or (3) above, we need to append the 296 * source name to the target name. 297 */ 298 if (type != FILE_TO_FILE) { 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 * concatenation 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 = find_last_component(curr->fts_path); 321 base = p - curr->fts_path; 322 323 if (!strcmp(&curr->fts_path[base], 324 "..")) 325 base += 1; 326 } else 327 base = curr->fts_pathlen; 328 } 329 330 p = &curr->fts_path[base]; 331 nlen = curr->fts_pathlen - base; 332 target_mid = to.target_end; 333 if (*p != '/' && target_mid[-1] != '/') 334 *target_mid++ = '/'; 335 *target_mid = '\0'; 336 if (target_mid - to.p_path + nlen >= PATH_MAX) { 337 warnx("%s%s: name too long (not copied)", 338 to.p_path, p); 339 rval = 1; 340 continue; 341 } 342 (void)strncat(target_mid, p, nlen); 343 to.p_end = target_mid + nlen; 344 *to.p_end = '\0'; 345 } 346 347 /* Not an error but need to remember it happened */ 348 if (stat(to.p_path, &to_stat) == -1) { 349 if (curr->fts_info == FTS_DP) 350 continue; 351 /* 352 * We use fts_pointer as a boolean to indicate that 353 * we created this directory ourselves. We'll use 354 * this later on via the fts_dne macro to decide 355 * whether or not to set the directory mode during 356 * the post-order pass. 357 */ 358 curr->fts_pointer = (void *)1; 359 } else { 360 /* 361 * Set directory mode/user/times on the post-order 362 * pass. We can't do this earlier because the mode 363 * may not allow us write permission. Furthermore, 364 * if we set the times during the pre-order pass, 365 * they will get changed later when the directory 366 * is populated. 367 */ 368 if (curr->fts_info == FTS_DP) { 369 if (!S_ISDIR(to_stat.st_mode)) 370 continue; 371 /* 372 * If not -p and directory didn't exist, set 373 * it to be the same as the from directory, 374 * unmodified by the umask; arguably wrong, 375 * but it's been that way forever. 376 */ 377 if (pflag && setfile(curr->fts_statp, -1)) 378 rval = 1; 379 else if (fts_dne(curr)) 380 (void)chmod(to.p_path, 381 curr->fts_statp->st_mode); 382 continue; 383 } 384 if (to_stat.st_dev == curr->fts_statp->st_dev && 385 to_stat.st_ino == curr->fts_statp->st_ino) { 386 warnx("%s and %s are identical (not copied).", 387 to.p_path, curr->fts_path); 388 rval = 1; 389 if (S_ISDIR(curr->fts_statp->st_mode)) 390 (void)fts_set(ftsp, curr, FTS_SKIP); 391 continue; 392 } 393 if (!S_ISDIR(curr->fts_statp->st_mode) && 394 S_ISDIR(to_stat.st_mode)) { 395 warnx("cannot overwrite directory %s with non-directory %s", 396 to.p_path, curr->fts_path); 397 rval = 1; 398 continue; 399 } 400 } 401 402 switch (curr->fts_statp->st_mode & S_IFMT) { 403 case S_IFLNK: 404 if ((cval = copy_link(curr, !fts_dne(curr))) == 1) 405 rval = 1; 406 if (!cval && vflag) 407 (void)fprintf(stdout, "%s -> %s\n", 408 curr->fts_path, to.p_path); 409 break; 410 case S_IFDIR: 411 if (!Rflag && !rflag) { 412 warnx("%s is a directory (not copied).", 413 curr->fts_path); 414 (void)fts_set(ftsp, curr, FTS_SKIP); 415 rval = 1; 416 break; 417 } 418 /* 419 * If the directory doesn't exist, create the new 420 * one with the from file mode plus owner RWX bits, 421 * modified by the umask. Trade-off between being 422 * able to write the directory (if from directory is 423 * 555) and not causing a permissions race. If the 424 * umask blocks owner writes, we fail.. 425 */ 426 if (fts_dne(curr)) { 427 if (mkdir(to.p_path, 428 curr->fts_statp->st_mode | S_IRWXU) == -1) 429 err(1, "%s", to.p_path); 430 else if (vflag) 431 (void)fprintf(stdout, "%s -> %s\n", 432 curr->fts_path, to.p_path); 433 } else if (!S_ISDIR(to_stat.st_mode)) 434 errc(1, ENOTDIR, "%s", to.p_path); 435 break; 436 case S_IFBLK: 437 case S_IFCHR: 438 if (Rflag) { 439 if ((cval = copy_special(curr->fts_statp, 440 !fts_dne(curr))) == 1) 441 rval = 1; 442 } else 443 if ((cval = copy_file(curr, !fts_dne(curr))) == 1) 444 rval = 1; 445 if (!cval && vflag) 446 (void)fprintf(stdout, "%s -> %s\n", 447 curr->fts_path, to.p_path); 448 cval = 0; 449 break; 450 case S_IFIFO: 451 if (Rflag) { 452 if ((cval = copy_fifo(curr->fts_statp, 453 !fts_dne(curr))) == 1) 454 rval = 1; 455 } else 456 if ((cval = copy_file(curr, !fts_dne(curr))) == 1) 457 rval = 1; 458 if (!cval && vflag) 459 (void)fprintf(stdout, "%s -> %s\n", 460 curr->fts_path, to.p_path); 461 cval = 0; 462 break; 463 case S_IFSOCK: 464 warnc(EOPNOTSUPP, "%s", curr->fts_path); 465 break; 466 default: 467 if ((cval = copy_file(curr, !fts_dne(curr))) == 1) 468 rval = 1; 469 if (!cval && vflag) 470 (void)fprintf(stdout, "%s -> %s\n", 471 curr->fts_path, to.p_path); 472 cval = 0; 473 break; 474 } 475 } 476 if (errno) 477 err(1, "fts_read"); 478 (void)fts_close(ftsp); 479 return (rval); 480 } 481