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 #ifndef lint 43 static char sccsid[] = "@(#)mv.c 8.2 (Berkeley) 4/2/94"; 44 #endif /* not lint */ 45 #endif 46 #include <sys/cdefs.h> 47 __FBSDID("$FreeBSD$"); 48 49 #include <sys/types.h> 50 #include <sys/acl.h> 51 #include <sys/param.h> 52 #include <sys/time.h> 53 #include <sys/wait.h> 54 #include <sys/stat.h> 55 #include <sys/mount.h> 56 57 #include <err.h> 58 #include <errno.h> 59 #include <fcntl.h> 60 #include <grp.h> 61 #include <limits.h> 62 #include <paths.h> 63 #include <pwd.h> 64 #include <stdio.h> 65 #include <stdlib.h> 66 #include <string.h> 67 #include <sysexits.h> 68 #include <unistd.h> 69 70 /* Exit code for a failed exec. */ 71 #define EXEC_FAILED 127 72 73 static int fflg, hflg, iflg, nflg, vflg; 74 75 static int copy(const char *, const char *); 76 static int do_move(const char *, const char *); 77 static int fastcopy(const char *, const char *, struct stat *); 78 static void usage(void); 79 static void preserve_fd_acls(int source_fd, int dest_fd, const char *source_path, 80 const char *dest_path); 81 82 int 83 main(int argc, char *argv[]) 84 { 85 size_t baselen, len; 86 int rval; 87 char *p, *endp; 88 struct stat sb; 89 int ch; 90 char path[PATH_MAX]; 91 92 while ((ch = getopt(argc, argv, "fhinv")) != -1) 93 switch (ch) { 94 case 'h': 95 hflg = 1; 96 break; 97 case 'i': 98 iflg = 1; 99 fflg = nflg = 0; 100 break; 101 case 'f': 102 fflg = 1; 103 iflg = nflg = 0; 104 break; 105 case 'n': 106 nflg = 1; 107 fflg = iflg = 0; 108 break; 109 case 'v': 110 vflg = 1; 111 break; 112 default: 113 usage(); 114 } 115 argc -= optind; 116 argv += optind; 117 118 if (argc < 2) 119 usage(); 120 121 /* 122 * If the stat on the target fails or the target isn't a directory, 123 * try the move. More than 2 arguments is an error in this case. 124 */ 125 if (stat(argv[argc - 1], &sb) || !S_ISDIR(sb.st_mode)) { 126 if (argc > 2) 127 errx(1, "%s is not a directory", argv[argc - 1]); 128 exit(do_move(argv[0], argv[1])); 129 } 130 131 /* 132 * If -h was specified, treat the target as a symlink instead of 133 * directory. 134 */ 135 if (hflg) { 136 if (argc > 2) 137 usage(); 138 if (lstat(argv[1], &sb) == 0 && S_ISLNK(sb.st_mode)) 139 exit(do_move(argv[0], argv[1])); 140 } 141 142 /* It's a directory, move each file into it. */ 143 if (strlen(argv[argc - 1]) > sizeof(path) - 1) 144 errx(1, "%s: destination pathname too long", *argv); 145 (void)strcpy(path, argv[argc - 1]); 146 baselen = strlen(path); 147 endp = &path[baselen]; 148 if (!baselen || *(endp - 1) != '/') { 149 *endp++ = '/'; 150 ++baselen; 151 } 152 for (rval = 0; --argc; ++argv) { 153 /* 154 * Find the last component of the source pathname. It 155 * may have trailing slashes. 156 */ 157 p = *argv + strlen(*argv); 158 while (p != *argv && p[-1] == '/') 159 --p; 160 while (p != *argv && p[-1] != '/') 161 --p; 162 163 if ((baselen + (len = strlen(p))) >= PATH_MAX) { 164 warnx("%s: destination pathname too long", *argv); 165 rval = 1; 166 } else { 167 memmove(endp, p, (size_t)len + 1); 168 if (do_move(*argv, path)) 169 rval = 1; 170 } 171 } 172 exit(rval); 173 } 174 175 static int 176 do_move(const char *from, const char *to) 177 { 178 struct stat sb; 179 int ask, ch, first; 180 char modep[15]; 181 182 /* 183 * Check access. If interactive and file exists, ask user if it 184 * should be replaced. Otherwise if file exists but isn't writable 185 * make sure the user wants to clobber it. 186 */ 187 if (!fflg && !access(to, F_OK)) { 188 189 /* prompt only if source exist */ 190 if (lstat(from, &sb) == -1) { 191 warn("%s", from); 192 return (1); 193 } 194 195 #define YESNO "(y/n [n]) " 196 ask = 0; 197 if (nflg) { 198 if (vflg) 199 printf("%s not overwritten\n", to); 200 return (0); 201 } else if (iflg) { 202 (void)fprintf(stderr, "overwrite %s? %s", to, YESNO); 203 ask = 1; 204 } else if (access(to, W_OK) && !stat(to, &sb) && isatty(STDIN_FILENO)) { 205 strmode(sb.st_mode, modep); 206 (void)fprintf(stderr, "override %s%s%s/%s for %s? %s", 207 modep + 1, modep[9] == ' ' ? "" : " ", 208 user_from_uid((unsigned long)sb.st_uid, 0), 209 group_from_gid((unsigned long)sb.st_gid, 0), to, YESNO); 210 ask = 1; 211 } 212 if (ask) { 213 first = ch = getchar(); 214 while (ch != '\n' && ch != EOF) 215 ch = getchar(); 216 if (first != 'y' && first != 'Y') { 217 (void)fprintf(stderr, "not overwritten\n"); 218 return (0); 219 } 220 } 221 } 222 /* 223 * Rename on FreeBSD will fail with EISDIR and ENOTDIR, before failing 224 * with EXDEV. Therefore, copy() doesn't have to perform the checks 225 * specified in the Step 3 of the POSIX mv specification. 226 */ 227 if (!rename(from, to)) { 228 if (vflg) 229 printf("%s -> %s\n", from, to); 230 return (0); 231 } 232 233 if (errno == EXDEV) { 234 struct statfs sfs; 235 char path[PATH_MAX]; 236 237 /* 238 * If the source is a symbolic link and is on another 239 * filesystem, it can be recreated at the destination. 240 */ 241 if (lstat(from, &sb) == -1) { 242 warn("%s", from); 243 return (1); 244 } 245 if (!S_ISLNK(sb.st_mode)) { 246 /* Can't mv(1) a mount point. */ 247 if (realpath(from, path) == NULL) { 248 warn("cannot resolve %s: %s", from, path); 249 return (1); 250 } 251 if (!statfs(path, &sfs) && 252 !strcmp(path, sfs.f_mntonname)) { 253 warnx("cannot rename a mount point"); 254 return (1); 255 } 256 } 257 } else { 258 warn("rename %s to %s", from, to); 259 return (1); 260 } 261 262 /* 263 * If rename fails because we're trying to cross devices, and 264 * it's a regular file, do the copy internally; otherwise, use 265 * cp and rm. 266 */ 267 if (lstat(from, &sb)) { 268 warn("%s", from); 269 return (1); 270 } 271 return (S_ISREG(sb.st_mode) ? 272 fastcopy(from, to, &sb) : copy(from, to)); 273 } 274 275 static int 276 fastcopy(const char *from, const char *to, struct stat *sbp) 277 { 278 struct timespec ts[2]; 279 static u_int blen = MAXPHYS; 280 static char *bp = NULL; 281 mode_t oldmode; 282 int nread, from_fd, to_fd; 283 struct stat tsb; 284 285 if ((from_fd = open(from, O_RDONLY, 0)) < 0) { 286 warn("fastcopy: open() failed (from): %s", from); 287 return (1); 288 } 289 if (bp == NULL && (bp = malloc((size_t)blen)) == NULL) { 290 warnx("malloc(%u) failed", blen); 291 (void)close(from_fd); 292 return (1); 293 } 294 while ((to_fd = 295 open(to, O_CREAT | O_EXCL | O_TRUNC | O_WRONLY, 0)) < 0) { 296 if (errno == EEXIST && unlink(to) == 0) 297 continue; 298 warn("fastcopy: open() failed (to): %s", to); 299 (void)close(from_fd); 300 return (1); 301 } 302 while ((nread = read(from_fd, bp, (size_t)blen)) > 0) 303 if (write(to_fd, bp, (size_t)nread) != nread) { 304 warn("fastcopy: write() failed: %s", to); 305 goto err; 306 } 307 if (nread < 0) { 308 warn("fastcopy: read() failed: %s", from); 309 err: if (unlink(to)) 310 warn("%s: remove", to); 311 (void)close(from_fd); 312 (void)close(to_fd); 313 return (1); 314 } 315 316 oldmode = sbp->st_mode & ALLPERMS; 317 if (fchown(to_fd, sbp->st_uid, sbp->st_gid)) { 318 warn("%s: set owner/group (was: %lu/%lu)", to, 319 (u_long)sbp->st_uid, (u_long)sbp->st_gid); 320 if (oldmode & (S_ISUID | S_ISGID)) { 321 warnx( 322 "%s: owner/group changed; clearing suid/sgid (mode was 0%03o)", 323 to, oldmode); 324 sbp->st_mode &= ~(S_ISUID | S_ISGID); 325 } 326 } 327 if (fchmod(to_fd, sbp->st_mode)) 328 warn("%s: set mode (was: 0%03o)", to, oldmode); 329 /* 330 * POSIX 1003.2c states that if _POSIX_ACL_EXTENDED is in effect 331 * for dest_file, then its ACLs shall reflect the ACLs of the 332 * source_file. 333 */ 334 preserve_fd_acls(from_fd, to_fd, from, to); 335 (void)close(from_fd); 336 /* 337 * XXX 338 * NFS doesn't support chflags; ignore errors unless there's reason 339 * to believe we're losing bits. (Note, this still won't be right 340 * if the server supports flags and we were trying to *remove* flags 341 * on a file that we copied, i.e., that we didn't create.) 342 */ 343 if (fstat(to_fd, &tsb) == 0) { 344 if ((sbp->st_flags & ~UF_ARCHIVE) != 345 (tsb.st_flags & ~UF_ARCHIVE)) { 346 if (fchflags(to_fd, 347 sbp->st_flags | (tsb.st_flags & UF_ARCHIVE))) 348 if (errno != EOPNOTSUPP || 349 ((sbp->st_flags & ~UF_ARCHIVE) != 0)) 350 warn("%s: set flags (was: 0%07o)", 351 to, sbp->st_flags); 352 } 353 } else 354 warn("%s: cannot stat", to); 355 356 ts[0] = sbp->st_atim; 357 ts[1] = sbp->st_mtim; 358 if (futimens(to_fd, ts)) 359 warn("%s: set times", to); 360 361 if (close(to_fd)) { 362 warn("%s", to); 363 return (1); 364 } 365 366 if (unlink(from)) { 367 warn("%s: remove", from); 368 return (1); 369 } 370 if (vflg) 371 printf("%s -> %s\n", from, to); 372 return (0); 373 } 374 375 static int 376 copy(const char *from, const char *to) 377 { 378 struct stat sb; 379 int pid, status; 380 381 if (lstat(to, &sb) == 0) { 382 /* Destination path exists. */ 383 if (S_ISDIR(sb.st_mode)) { 384 if (rmdir(to) != 0) { 385 warn("rmdir %s", to); 386 return (1); 387 } 388 } else { 389 if (unlink(to) != 0) { 390 warn("unlink %s", to); 391 return (1); 392 } 393 } 394 } else if (errno != ENOENT) { 395 warn("%s", to); 396 return (1); 397 } 398 399 /* Copy source to destination. */ 400 if (!(pid = vfork())) { 401 execl(_PATH_CP, "mv", vflg ? "-PRpv" : "-PRp", "--", from, to, 402 (char *)NULL); 403 _exit(EXEC_FAILED); 404 } 405 if (waitpid(pid, &status, 0) == -1) { 406 warn("%s %s %s: waitpid", _PATH_CP, from, to); 407 return (1); 408 } 409 if (!WIFEXITED(status)) { 410 warnx("%s %s %s: did not terminate normally", 411 _PATH_CP, from, to); 412 return (1); 413 } 414 switch (WEXITSTATUS(status)) { 415 case 0: 416 break; 417 case EXEC_FAILED: 418 warnx("%s %s %s: exec failed", _PATH_CP, from, to); 419 return (1); 420 default: 421 warnx("%s %s %s: terminated with %d (non-zero) status", 422 _PATH_CP, from, to, WEXITSTATUS(status)); 423 return (1); 424 } 425 426 /* Delete the source. */ 427 if (!(pid = vfork())) { 428 execl(_PATH_RM, "mv", "-rf", "--", from, (char *)NULL); 429 _exit(EXEC_FAILED); 430 } 431 if (waitpid(pid, &status, 0) == -1) { 432 warn("%s %s: waitpid", _PATH_RM, from); 433 return (1); 434 } 435 if (!WIFEXITED(status)) { 436 warnx("%s %s: did not terminate normally", _PATH_RM, from); 437 return (1); 438 } 439 switch (WEXITSTATUS(status)) { 440 case 0: 441 break; 442 case EXEC_FAILED: 443 warnx("%s %s: exec failed", _PATH_RM, from); 444 return (1); 445 default: 446 warnx("%s %s: terminated with %d (non-zero) status", 447 _PATH_RM, from, WEXITSTATUS(status)); 448 return (1); 449 } 450 return (0); 451 } 452 453 static void 454 preserve_fd_acls(int source_fd, int dest_fd, const char *source_path, 455 const char *dest_path) 456 { 457 acl_t acl; 458 acl_type_t acl_type; 459 int acl_supported = 0, ret, trivial; 460 461 ret = fpathconf(source_fd, _PC_ACL_NFS4); 462 if (ret > 0 ) { 463 acl_supported = 1; 464 acl_type = ACL_TYPE_NFS4; 465 } else if (ret < 0 && errno != EINVAL) { 466 warn("fpathconf(..., _PC_ACL_NFS4) failed for %s", 467 source_path); 468 return; 469 } 470 if (acl_supported == 0) { 471 ret = fpathconf(source_fd, _PC_ACL_EXTENDED); 472 if (ret > 0 ) { 473 acl_supported = 1; 474 acl_type = ACL_TYPE_ACCESS; 475 } else if (ret < 0 && errno != EINVAL) { 476 warn("fpathconf(..., _PC_ACL_EXTENDED) failed for %s", 477 source_path); 478 return; 479 } 480 } 481 if (acl_supported == 0) 482 return; 483 484 acl = acl_get_fd_np(source_fd, acl_type); 485 if (acl == NULL) { 486 warn("failed to get acl entries for %s", source_path); 487 return; 488 } 489 if (acl_is_trivial_np(acl, &trivial)) { 490 warn("acl_is_trivial() failed for %s", source_path); 491 acl_free(acl); 492 return; 493 } 494 if (trivial) { 495 acl_free(acl); 496 return; 497 } 498 if (acl_set_fd_np(dest_fd, acl, acl_type) < 0) { 499 warn("failed to set acl entries for %s", dest_path); 500 acl_free(acl); 501 return; 502 } 503 acl_free(acl); 504 } 505 506 static void 507 usage(void) 508 { 509 510 (void)fprintf(stderr, "%s\n%s\n", 511 "usage: mv [-f | -i | -n] [-hv] source target", 512 " mv [-f | -i | -n] [-v] source ... directory"); 513 exit(EX_USAGE); 514 } 515