1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1989, 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 * Ken Smith of The State University of New York at Buffalo. 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. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #include <sys/types.h> 36 #include <sys/acl.h> 37 #include <sys/param.h> 38 #include <sys/time.h> 39 #include <sys/wait.h> 40 #include <sys/stat.h> 41 #include <sys/mount.h> 42 43 #include <err.h> 44 #include <errno.h> 45 #include <fcntl.h> 46 #include <grp.h> 47 #include <limits.h> 48 #include <paths.h> 49 #include <pwd.h> 50 #include <stdio.h> 51 #include <stdlib.h> 52 #include <string.h> 53 #include <sysexits.h> 54 #include <unistd.h> 55 56 /* Exit code for a failed exec. */ 57 #define EXEC_FAILED 127 58 59 static int fflg, hflg, iflg, nflg, vflg; 60 61 static int copy(const char *, const char *); 62 static int do_move(const char *, const char *); 63 static int fastcopy(const char *, const char *, struct stat *); 64 static void usage(void); 65 static void preserve_fd_acls(int source_fd, int dest_fd, const char *source_path, 66 const char *dest_path); 67 68 int 69 main(int argc, char *argv[]) 70 { 71 size_t baselen, len; 72 int rval; 73 char *p, *endp; 74 struct stat sb; 75 int ch; 76 char path[PATH_MAX]; 77 78 while ((ch = getopt(argc, argv, "fhinv")) != -1) 79 switch (ch) { 80 case 'h': 81 hflg = 1; 82 break; 83 case 'i': 84 iflg = 1; 85 fflg = nflg = 0; 86 break; 87 case 'f': 88 fflg = 1; 89 iflg = nflg = 0; 90 break; 91 case 'n': 92 nflg = 1; 93 fflg = iflg = 0; 94 break; 95 case 'v': 96 vflg = 1; 97 break; 98 default: 99 usage(); 100 } 101 argc -= optind; 102 argv += optind; 103 104 if (argc < 2) 105 usage(); 106 107 /* 108 * If the stat on the target fails or the target isn't a directory, 109 * try the move. More than 2 arguments is an error in this case. 110 */ 111 if (stat(argv[argc - 1], &sb) || !S_ISDIR(sb.st_mode)) { 112 if (argc > 2) 113 errx(1, "%s is not a directory", argv[argc - 1]); 114 exit(do_move(argv[0], argv[1])); 115 } 116 117 /* 118 * If -h was specified, treat the target as a symlink instead of 119 * directory. 120 */ 121 if (hflg) { 122 if (argc > 2) 123 usage(); 124 if (lstat(argv[1], &sb) == 0 && S_ISLNK(sb.st_mode)) 125 exit(do_move(argv[0], argv[1])); 126 } 127 128 /* It's a directory, move each file into it. */ 129 if (strlen(argv[argc - 1]) > sizeof(path) - 1) 130 errx(1, "%s: destination pathname too long", *argv); 131 (void)strcpy(path, argv[argc - 1]); 132 baselen = strlen(path); 133 endp = &path[baselen]; 134 if (!baselen || *(endp - 1) != '/') { 135 *endp++ = '/'; 136 ++baselen; 137 } 138 for (rval = 0; --argc; ++argv) { 139 /* 140 * Find the last component of the source pathname. It 141 * may have trailing slashes. 142 */ 143 p = *argv + strlen(*argv); 144 while (p != *argv && p[-1] == '/') 145 --p; 146 while (p != *argv && p[-1] != '/') 147 --p; 148 149 if ((baselen + (len = strlen(p))) >= PATH_MAX) { 150 warnx("%s: destination pathname too long", *argv); 151 rval = 1; 152 } else { 153 memmove(endp, p, (size_t)len + 1); 154 if (do_move(*argv, path)) 155 rval = 1; 156 } 157 } 158 exit(rval); 159 } 160 161 static int 162 do_move(const char *from, const char *to) 163 { 164 struct stat sb; 165 int ask, ch, first; 166 char modep[15]; 167 168 /* 169 * Check access. If interactive and file exists, ask user if it 170 * should be replaced. Otherwise if file exists but isn't writable 171 * make sure the user wants to clobber it. 172 */ 173 if (!fflg && !access(to, F_OK)) { 174 175 /* prompt only if source exists */ 176 if (lstat(from, &sb) == -1) { 177 warn("%s", from); 178 return (1); 179 } 180 181 #define YESNO "(y/n [n]) " 182 ask = 0; 183 if (nflg) { 184 if (vflg) 185 printf("%s not overwritten\n", to); 186 return (0); 187 } else if (iflg) { 188 (void)fprintf(stderr, "overwrite %s? %s", to, YESNO); 189 ask = 1; 190 } else if (access(to, W_OK) && !stat(to, &sb) && isatty(STDIN_FILENO)) { 191 strmode(sb.st_mode, modep); 192 (void)fprintf(stderr, "override %s%s%s/%s for %s? %s", 193 modep + 1, modep[9] == ' ' ? "" : " ", 194 user_from_uid((unsigned long)sb.st_uid, 0), 195 group_from_gid((unsigned long)sb.st_gid, 0), to, YESNO); 196 ask = 1; 197 } 198 if (ask) { 199 first = ch = getchar(); 200 while (ch != '\n' && ch != EOF) 201 ch = getchar(); 202 if (first != 'y' && first != 'Y') { 203 (void)fprintf(stderr, "not overwritten\n"); 204 return (0); 205 } 206 } 207 } 208 /* 209 * Rename on FreeBSD will fail with EISDIR and ENOTDIR, before failing 210 * with EXDEV. Therefore, copy() doesn't have to perform the checks 211 * specified in the Step 3 of the POSIX mv specification. 212 */ 213 if (!rename(from, to)) { 214 if (vflg) 215 printf("%s -> %s\n", from, to); 216 return (0); 217 } 218 219 if (errno == EXDEV) { 220 struct statfs sfs; 221 char path[PATH_MAX]; 222 223 /* 224 * If the source is a symbolic link and is on another 225 * filesystem, it can be recreated at the destination. 226 */ 227 if (lstat(from, &sb) == -1) { 228 warn("%s", from); 229 return (1); 230 } 231 if (!S_ISLNK(sb.st_mode)) { 232 /* Can't mv(1) a mount point. */ 233 if (realpath(from, path) == NULL) { 234 warn("cannot resolve %s: %s", from, path); 235 return (1); 236 } 237 if (!statfs(path, &sfs) && 238 !strcmp(path, sfs.f_mntonname)) { 239 warnx("cannot rename a mount point"); 240 return (1); 241 } 242 } 243 } else { 244 warn("rename %s to %s", from, to); 245 return (1); 246 } 247 248 /* 249 * If rename fails because we're trying to cross devices, and 250 * it's a regular file, do the copy internally; otherwise, use 251 * cp and rm. 252 */ 253 if (lstat(from, &sb)) { 254 warn("%s", from); 255 return (1); 256 } 257 return (S_ISREG(sb.st_mode) ? 258 fastcopy(from, to, &sb) : copy(from, to)); 259 } 260 261 static int 262 fastcopy(const char *from, const char *to, struct stat *sbp) 263 { 264 struct timespec ts[2]; 265 struct stat tsb; 266 static char *bp = NULL; 267 static size_t blen = MAXPHYS; 268 ssize_t nread; 269 int from_fd, to_fd; 270 mode_t oldmode; 271 272 if ((from_fd = open(from, O_RDONLY, 0)) < 0) { 273 warn("fastcopy: open() failed (from): %s", from); 274 return (1); 275 } 276 if (bp == NULL && (bp = malloc(blen)) == NULL) { 277 warnx("malloc(%zu) failed", blen); 278 (void)close(from_fd); 279 return (1); 280 } 281 while ((to_fd = 282 open(to, O_CREAT | O_EXCL | O_TRUNC | O_WRONLY, 0)) < 0) { 283 if (errno == EEXIST && unlink(to) == 0) 284 continue; 285 warn("fastcopy: open() failed (to): %s", to); 286 (void)close(from_fd); 287 return (1); 288 } 289 while ((nread = read(from_fd, bp, blen)) > 0) 290 if (write(to_fd, bp, (size_t)nread) != nread) { 291 warn("fastcopy: write() failed: %s", to); 292 goto err; 293 } 294 if (nread < 0) { 295 warn("fastcopy: read() failed: %s", from); 296 err: if (unlink(to)) 297 warn("%s: remove", to); 298 (void)close(from_fd); 299 (void)close(to_fd); 300 return (1); 301 } 302 303 oldmode = sbp->st_mode & ALLPERMS; 304 if (fchown(to_fd, sbp->st_uid, sbp->st_gid)) { 305 warn("%s: set owner/group (was: %lu/%lu)", to, 306 (u_long)sbp->st_uid, (u_long)sbp->st_gid); 307 if (oldmode & (S_ISUID | S_ISGID)) { 308 warnx( 309 "%s: owner/group changed; clearing suid/sgid (mode was 0%03o)", 310 to, oldmode); 311 sbp->st_mode &= ~(S_ISUID | S_ISGID); 312 } 313 } 314 if (fchmod(to_fd, sbp->st_mode)) 315 warn("%s: set mode (was: 0%03o)", to, oldmode); 316 /* 317 * POSIX 1003.2c states that if _POSIX_ACL_EXTENDED is in effect 318 * for dest_file, then its ACLs shall reflect the ACLs of the 319 * source_file. 320 */ 321 preserve_fd_acls(from_fd, to_fd, from, to); 322 (void)close(from_fd); 323 324 ts[0] = sbp->st_atim; 325 ts[1] = sbp->st_mtim; 326 if (futimens(to_fd, ts)) 327 warn("%s: set times", to); 328 329 /* 330 * XXX 331 * NFS doesn't support chflags; ignore errors unless there's reason 332 * to believe we're losing bits. (Note, this still won't be right 333 * if the server supports flags and we were trying to *remove* flags 334 * on a file that we copied, i.e., that we didn't create.) 335 */ 336 if (fstat(to_fd, &tsb) == 0) { 337 if ((sbp->st_flags & ~UF_ARCHIVE) != 338 (tsb.st_flags & ~UF_ARCHIVE)) { 339 if (fchflags(to_fd, 340 sbp->st_flags | (tsb.st_flags & UF_ARCHIVE))) 341 if (errno != EOPNOTSUPP || 342 ((sbp->st_flags & ~UF_ARCHIVE) != 0)) 343 warn("%s: set flags (was: 0%07o)", 344 to, sbp->st_flags); 345 } 346 } else 347 warn("%s: cannot stat", to); 348 349 if (close(to_fd)) { 350 warn("%s", to); 351 return (1); 352 } 353 354 if (unlink(from)) { 355 warn("%s: remove", from); 356 return (1); 357 } 358 if (vflg) 359 printf("%s -> %s\n", from, to); 360 return (0); 361 } 362 363 static int 364 copy(const char *from, const char *to) 365 { 366 struct stat sb; 367 int pid, status; 368 369 if (lstat(to, &sb) == 0) { 370 /* Destination path exists. */ 371 if (S_ISDIR(sb.st_mode)) { 372 if (rmdir(to) != 0) { 373 warn("rmdir %s", to); 374 return (1); 375 } 376 } else { 377 if (unlink(to) != 0) { 378 warn("unlink %s", to); 379 return (1); 380 } 381 } 382 } else if (errno != ENOENT) { 383 warn("%s", to); 384 return (1); 385 } 386 387 /* Copy source to destination. */ 388 if (!(pid = vfork())) { 389 execl(_PATH_CP, "mv", vflg ? "-PRpv" : "-PRp", "--", from, to, 390 (char *)NULL); 391 _exit(EXEC_FAILED); 392 } 393 if (waitpid(pid, &status, 0) == -1) { 394 warn("%s %s %s: waitpid", _PATH_CP, from, to); 395 return (1); 396 } 397 if (!WIFEXITED(status)) { 398 warnx("%s %s %s: did not terminate normally", 399 _PATH_CP, from, to); 400 return (1); 401 } 402 switch (WEXITSTATUS(status)) { 403 case 0: 404 break; 405 case EXEC_FAILED: 406 warnx("%s %s %s: exec failed", _PATH_CP, from, to); 407 return (1); 408 default: 409 warnx("%s %s %s: terminated with %d (non-zero) status", 410 _PATH_CP, from, to, WEXITSTATUS(status)); 411 return (1); 412 } 413 414 /* Delete the source. */ 415 if (!(pid = vfork())) { 416 execl(_PATH_RM, "mv", "-rf", "--", from, (char *)NULL); 417 _exit(EXEC_FAILED); 418 } 419 if (waitpid(pid, &status, 0) == -1) { 420 warn("%s %s: waitpid", _PATH_RM, from); 421 return (1); 422 } 423 if (!WIFEXITED(status)) { 424 warnx("%s %s: did not terminate normally", _PATH_RM, from); 425 return (1); 426 } 427 switch (WEXITSTATUS(status)) { 428 case 0: 429 break; 430 case EXEC_FAILED: 431 warnx("%s %s: exec failed", _PATH_RM, from); 432 return (1); 433 default: 434 warnx("%s %s: terminated with %d (non-zero) status", 435 _PATH_RM, from, WEXITSTATUS(status)); 436 return (1); 437 } 438 return (0); 439 } 440 441 static void 442 preserve_fd_acls(int source_fd, int dest_fd, const char *source_path, 443 const char *dest_path) 444 { 445 acl_t acl; 446 acl_type_t acl_type; 447 int acl_supported = 0, ret, trivial; 448 449 ret = fpathconf(source_fd, _PC_ACL_NFS4); 450 if (ret > 0 ) { 451 acl_supported = 1; 452 acl_type = ACL_TYPE_NFS4; 453 } else if (ret < 0 && errno != EINVAL) { 454 warn("fpathconf(..., _PC_ACL_NFS4) failed for %s", 455 source_path); 456 return; 457 } 458 if (acl_supported == 0) { 459 ret = fpathconf(source_fd, _PC_ACL_EXTENDED); 460 if (ret > 0 ) { 461 acl_supported = 1; 462 acl_type = ACL_TYPE_ACCESS; 463 } else if (ret < 0 && errno != EINVAL) { 464 warn("fpathconf(..., _PC_ACL_EXTENDED) failed for %s", 465 source_path); 466 return; 467 } 468 } 469 if (acl_supported == 0) 470 return; 471 472 acl = acl_get_fd_np(source_fd, acl_type); 473 if (acl == NULL) { 474 warn("failed to get acl entries for %s", source_path); 475 return; 476 } 477 if (acl_is_trivial_np(acl, &trivial)) { 478 warn("acl_is_trivial() failed for %s", source_path); 479 acl_free(acl); 480 return; 481 } 482 if (trivial) { 483 acl_free(acl); 484 return; 485 } 486 if (acl_set_fd_np(dest_fd, acl, acl_type) < 0) { 487 warn("failed to set acl entries for %s", dest_path); 488 acl_free(acl); 489 return; 490 } 491 acl_free(acl); 492 } 493 494 static void 495 usage(void) 496 { 497 498 (void)fprintf(stderr, "%s\n%s\n", 499 "usage: mv [-f | -i | -n] [-hv] source target", 500 " mv [-f | -i | -n] [-v] source ... directory"); 501 exit(EX_USAGE); 502 } 503