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 #if 0 36 #ifndef lint 37 static char const copyright[] = 38 "@(#) Copyright (c) 1989, 1993, 1994\n\ 39 The Regents of the University of California. All rights reserved.\n"; 40 #endif /* not lint */ 41 42 #endif 43 #include <sys/cdefs.h> 44 #include <sys/types.h> 45 #include <sys/acl.h> 46 #include <sys/param.h> 47 #include <sys/time.h> 48 #include <sys/wait.h> 49 #include <sys/stat.h> 50 #include <sys/mount.h> 51 52 #include <err.h> 53 #include <errno.h> 54 #include <fcntl.h> 55 #include <grp.h> 56 #include <limits.h> 57 #include <paths.h> 58 #include <pwd.h> 59 #include <stdio.h> 60 #include <stdlib.h> 61 #include <string.h> 62 #include <sysexits.h> 63 #include <unistd.h> 64 65 /* Exit code for a failed exec. */ 66 #define EXEC_FAILED 127 67 68 static int fflg, hflg, iflg, nflg, vflg; 69 70 static int copy(const char *, const char *); 71 static int do_move(const char *, const char *); 72 static int fastcopy(const char *, const char *, struct stat *); 73 static void usage(void); 74 static void preserve_fd_acls(int source_fd, int dest_fd, const char *source_path, 75 const char *dest_path); 76 77 int 78 main(int argc, char *argv[]) 79 { 80 size_t baselen, len; 81 int rval; 82 char *p, *endp; 83 struct stat sb; 84 int ch; 85 char path[PATH_MAX]; 86 87 while ((ch = getopt(argc, argv, "fhinv")) != -1) 88 switch (ch) { 89 case 'h': 90 hflg = 1; 91 break; 92 case 'i': 93 iflg = 1; 94 fflg = nflg = 0; 95 break; 96 case 'f': 97 fflg = 1; 98 iflg = nflg = 0; 99 break; 100 case 'n': 101 nflg = 1; 102 fflg = iflg = 0; 103 break; 104 case 'v': 105 vflg = 1; 106 break; 107 default: 108 usage(); 109 } 110 argc -= optind; 111 argv += optind; 112 113 if (argc < 2) 114 usage(); 115 116 /* 117 * If the stat on the target fails or the target isn't a directory, 118 * try the move. More than 2 arguments is an error in this case. 119 */ 120 if (stat(argv[argc - 1], &sb) || !S_ISDIR(sb.st_mode)) { 121 if (argc > 2) 122 errx(1, "%s is not a directory", argv[argc - 1]); 123 exit(do_move(argv[0], argv[1])); 124 } 125 126 /* 127 * If -h was specified, treat the target as a symlink instead of 128 * directory. 129 */ 130 if (hflg) { 131 if (argc > 2) 132 usage(); 133 if (lstat(argv[1], &sb) == 0 && S_ISLNK(sb.st_mode)) 134 exit(do_move(argv[0], argv[1])); 135 } 136 137 /* It's a directory, move each file into it. */ 138 if (strlen(argv[argc - 1]) > sizeof(path) - 1) 139 errx(1, "%s: destination pathname too long", *argv); 140 (void)strcpy(path, argv[argc - 1]); 141 baselen = strlen(path); 142 endp = &path[baselen]; 143 if (!baselen || *(endp - 1) != '/') { 144 *endp++ = '/'; 145 ++baselen; 146 } 147 for (rval = 0; --argc; ++argv) { 148 /* 149 * Find the last component of the source pathname. It 150 * may have trailing slashes. 151 */ 152 p = *argv + strlen(*argv); 153 while (p != *argv && p[-1] == '/') 154 --p; 155 while (p != *argv && p[-1] != '/') 156 --p; 157 158 if ((baselen + (len = strlen(p))) >= PATH_MAX) { 159 warnx("%s: destination pathname too long", *argv); 160 rval = 1; 161 } else { 162 memmove(endp, p, (size_t)len + 1); 163 if (do_move(*argv, path)) 164 rval = 1; 165 } 166 } 167 exit(rval); 168 } 169 170 static int 171 do_move(const char *from, const char *to) 172 { 173 struct stat sb; 174 int ask, ch, first; 175 char modep[15]; 176 177 /* 178 * Check access. If interactive and file exists, ask user if it 179 * should be replaced. Otherwise if file exists but isn't writable 180 * make sure the user wants to clobber it. 181 */ 182 if (!fflg && !access(to, F_OK)) { 183 184 /* prompt only if source exist */ 185 if (lstat(from, &sb) == -1) { 186 warn("%s", from); 187 return (1); 188 } 189 190 #define YESNO "(y/n [n]) " 191 ask = 0; 192 if (nflg) { 193 if (vflg) 194 printf("%s not overwritten\n", to); 195 return (0); 196 } else if (iflg) { 197 (void)fprintf(stderr, "overwrite %s? %s", to, YESNO); 198 ask = 1; 199 } else if (access(to, W_OK) && !stat(to, &sb) && isatty(STDIN_FILENO)) { 200 strmode(sb.st_mode, modep); 201 (void)fprintf(stderr, "override %s%s%s/%s for %s? %s", 202 modep + 1, modep[9] == ' ' ? "" : " ", 203 user_from_uid((unsigned long)sb.st_uid, 0), 204 group_from_gid((unsigned long)sb.st_gid, 0), to, YESNO); 205 ask = 1; 206 } 207 if (ask) { 208 first = ch = getchar(); 209 while (ch != '\n' && ch != EOF) 210 ch = getchar(); 211 if (first != 'y' && first != 'Y') { 212 (void)fprintf(stderr, "not overwritten\n"); 213 return (0); 214 } 215 } 216 } 217 /* 218 * Rename on FreeBSD will fail with EISDIR and ENOTDIR, before failing 219 * with EXDEV. Therefore, copy() doesn't have to perform the checks 220 * specified in the Step 3 of the POSIX mv specification. 221 */ 222 if (!rename(from, to)) { 223 if (vflg) 224 printf("%s -> %s\n", from, to); 225 return (0); 226 } 227 228 if (errno == EXDEV) { 229 struct statfs sfs; 230 char path[PATH_MAX]; 231 232 /* 233 * If the source is a symbolic link and is on another 234 * filesystem, it can be recreated at the destination. 235 */ 236 if (lstat(from, &sb) == -1) { 237 warn("%s", from); 238 return (1); 239 } 240 if (!S_ISLNK(sb.st_mode)) { 241 /* Can't mv(1) a mount point. */ 242 if (realpath(from, path) == NULL) { 243 warn("cannot resolve %s: %s", from, path); 244 return (1); 245 } 246 if (!statfs(path, &sfs) && 247 !strcmp(path, sfs.f_mntonname)) { 248 warnx("cannot rename a mount point"); 249 return (1); 250 } 251 } 252 } else { 253 warn("rename %s to %s", from, to); 254 return (1); 255 } 256 257 /* 258 * If rename fails because we're trying to cross devices, and 259 * it's a regular file, do the copy internally; otherwise, use 260 * cp and rm. 261 */ 262 if (lstat(from, &sb)) { 263 warn("%s", from); 264 return (1); 265 } 266 return (S_ISREG(sb.st_mode) ? 267 fastcopy(from, to, &sb) : copy(from, to)); 268 } 269 270 static int 271 fastcopy(const char *from, const char *to, struct stat *sbp) 272 { 273 struct timespec ts[2]; 274 static u_int blen = MAXPHYS; 275 static char *bp = NULL; 276 mode_t oldmode; 277 int nread, from_fd, to_fd; 278 struct stat tsb; 279 280 if ((from_fd = open(from, O_RDONLY, 0)) < 0) { 281 warn("fastcopy: open() failed (from): %s", from); 282 return (1); 283 } 284 if (bp == NULL && (bp = malloc((size_t)blen)) == NULL) { 285 warnx("malloc(%u) failed", blen); 286 (void)close(from_fd); 287 return (1); 288 } 289 while ((to_fd = 290 open(to, O_CREAT | O_EXCL | O_TRUNC | O_WRONLY, 0)) < 0) { 291 if (errno == EEXIST && unlink(to) == 0) 292 continue; 293 warn("fastcopy: open() failed (to): %s", to); 294 (void)close(from_fd); 295 return (1); 296 } 297 while ((nread = read(from_fd, bp, (size_t)blen)) > 0) 298 if (write(to_fd, bp, (size_t)nread) != nread) { 299 warn("fastcopy: write() failed: %s", to); 300 goto err; 301 } 302 if (nread < 0) { 303 warn("fastcopy: read() failed: %s", from); 304 err: if (unlink(to)) 305 warn("%s: remove", to); 306 (void)close(from_fd); 307 (void)close(to_fd); 308 return (1); 309 } 310 311 oldmode = sbp->st_mode & ALLPERMS; 312 if (fchown(to_fd, sbp->st_uid, sbp->st_gid)) { 313 warn("%s: set owner/group (was: %lu/%lu)", to, 314 (u_long)sbp->st_uid, (u_long)sbp->st_gid); 315 if (oldmode & (S_ISUID | S_ISGID)) { 316 warnx( 317 "%s: owner/group changed; clearing suid/sgid (mode was 0%03o)", 318 to, oldmode); 319 sbp->st_mode &= ~(S_ISUID | S_ISGID); 320 } 321 } 322 if (fchmod(to_fd, sbp->st_mode)) 323 warn("%s: set mode (was: 0%03o)", to, oldmode); 324 /* 325 * POSIX 1003.2c states that if _POSIX_ACL_EXTENDED is in effect 326 * for dest_file, then its ACLs shall reflect the ACLs of the 327 * source_file. 328 */ 329 preserve_fd_acls(from_fd, to_fd, from, to); 330 (void)close(from_fd); 331 /* 332 * XXX 333 * NFS doesn't support chflags; ignore errors unless there's reason 334 * to believe we're losing bits. (Note, this still won't be right 335 * if the server supports flags and we were trying to *remove* flags 336 * on a file that we copied, i.e., that we didn't create.) 337 */ 338 if (fstat(to_fd, &tsb) == 0) { 339 if ((sbp->st_flags & ~UF_ARCHIVE) != 340 (tsb.st_flags & ~UF_ARCHIVE)) { 341 if (fchflags(to_fd, 342 sbp->st_flags | (tsb.st_flags & UF_ARCHIVE))) 343 if (errno != EOPNOTSUPP || 344 ((sbp->st_flags & ~UF_ARCHIVE) != 0)) 345 warn("%s: set flags (was: 0%07o)", 346 to, sbp->st_flags); 347 } 348 } else 349 warn("%s: cannot stat", to); 350 351 ts[0] = sbp->st_atim; 352 ts[1] = sbp->st_mtim; 353 if (futimens(to_fd, ts)) 354 warn("%s: set times", to); 355 356 if (close(to_fd)) { 357 warn("%s", to); 358 return (1); 359 } 360 361 if (unlink(from)) { 362 warn("%s: remove", from); 363 return (1); 364 } 365 if (vflg) 366 printf("%s -> %s\n", from, to); 367 return (0); 368 } 369 370 static int 371 copy(const char *from, const char *to) 372 { 373 struct stat sb; 374 int pid, status; 375 376 if (lstat(to, &sb) == 0) { 377 /* Destination path exists. */ 378 if (S_ISDIR(sb.st_mode)) { 379 if (rmdir(to) != 0) { 380 warn("rmdir %s", to); 381 return (1); 382 } 383 } else { 384 if (unlink(to) != 0) { 385 warn("unlink %s", to); 386 return (1); 387 } 388 } 389 } else if (errno != ENOENT) { 390 warn("%s", to); 391 return (1); 392 } 393 394 /* Copy source to destination. */ 395 if (!(pid = vfork())) { 396 execl(_PATH_CP, "mv", vflg ? "-PRpv" : "-PRp", "--", from, to, 397 (char *)NULL); 398 _exit(EXEC_FAILED); 399 } 400 if (waitpid(pid, &status, 0) == -1) { 401 warn("%s %s %s: waitpid", _PATH_CP, from, to); 402 return (1); 403 } 404 if (!WIFEXITED(status)) { 405 warnx("%s %s %s: did not terminate normally", 406 _PATH_CP, from, to); 407 return (1); 408 } 409 switch (WEXITSTATUS(status)) { 410 case 0: 411 break; 412 case EXEC_FAILED: 413 warnx("%s %s %s: exec failed", _PATH_CP, from, to); 414 return (1); 415 default: 416 warnx("%s %s %s: terminated with %d (non-zero) status", 417 _PATH_CP, from, to, WEXITSTATUS(status)); 418 return (1); 419 } 420 421 /* Delete the source. */ 422 if (!(pid = vfork())) { 423 execl(_PATH_RM, "mv", "-rf", "--", from, (char *)NULL); 424 _exit(EXEC_FAILED); 425 } 426 if (waitpid(pid, &status, 0) == -1) { 427 warn("%s %s: waitpid", _PATH_RM, from); 428 return (1); 429 } 430 if (!WIFEXITED(status)) { 431 warnx("%s %s: did not terminate normally", _PATH_RM, from); 432 return (1); 433 } 434 switch (WEXITSTATUS(status)) { 435 case 0: 436 break; 437 case EXEC_FAILED: 438 warnx("%s %s: exec failed", _PATH_RM, from); 439 return (1); 440 default: 441 warnx("%s %s: terminated with %d (non-zero) status", 442 _PATH_RM, from, WEXITSTATUS(status)); 443 return (1); 444 } 445 return (0); 446 } 447 448 static void 449 preserve_fd_acls(int source_fd, int dest_fd, const char *source_path, 450 const char *dest_path) 451 { 452 acl_t acl; 453 acl_type_t acl_type; 454 int acl_supported = 0, ret, trivial; 455 456 ret = fpathconf(source_fd, _PC_ACL_NFS4); 457 if (ret > 0 ) { 458 acl_supported = 1; 459 acl_type = ACL_TYPE_NFS4; 460 } else if (ret < 0 && errno != EINVAL) { 461 warn("fpathconf(..., _PC_ACL_NFS4) failed for %s", 462 source_path); 463 return; 464 } 465 if (acl_supported == 0) { 466 ret = fpathconf(source_fd, _PC_ACL_EXTENDED); 467 if (ret > 0 ) { 468 acl_supported = 1; 469 acl_type = ACL_TYPE_ACCESS; 470 } else if (ret < 0 && errno != EINVAL) { 471 warn("fpathconf(..., _PC_ACL_EXTENDED) failed for %s", 472 source_path); 473 return; 474 } 475 } 476 if (acl_supported == 0) 477 return; 478 479 acl = acl_get_fd_np(source_fd, acl_type); 480 if (acl == NULL) { 481 warn("failed to get acl entries for %s", source_path); 482 return; 483 } 484 if (acl_is_trivial_np(acl, &trivial)) { 485 warn("acl_is_trivial() failed for %s", source_path); 486 acl_free(acl); 487 return; 488 } 489 if (trivial) { 490 acl_free(acl); 491 return; 492 } 493 if (acl_set_fd_np(dest_fd, acl, acl_type) < 0) { 494 warn("failed to set acl entries for %s", dest_path); 495 acl_free(acl); 496 return; 497 } 498 acl_free(acl); 499 } 500 501 static void 502 usage(void) 503 { 504 505 (void)fprintf(stderr, "%s\n%s\n", 506 "usage: mv [-f | -i | -n] [-hv] source target", 507 " mv [-f | -i | -n] [-v] source ... directory"); 508 exit(EX_USAGE); 509 } 510