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