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
main(int argc,char * argv[])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
do_move(const char * from,const char * to)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
fastcopy(const char * from,const char * to,struct stat * sbp)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
copy(const char * from,const char * to)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
preserve_fd_acls(int source_fd,int dest_fd,const char * source_path,const char * dest_path)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
usage(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