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