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
37static 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
43static 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
73static int	fflg, hflg, iflg, nflg, vflg;
74
75static int	copy(const char *, const char *);
76static int	do_move(const char *, const char *);
77static int	fastcopy(const char *, const char *, struct stat *);
78static void	usage(void);
79static void	preserve_fd_acls(int source_fd, int dest_fd, const char *source_path,
80		    const char *dest_path);
81
82int
83main(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
175static int
176do_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
275static int
276fastcopy(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);
309err:		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
375static int
376copy(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
453static void
454preserve_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
506static void
507usage(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