GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: bin/mv/mv.c Lines: 38 164 23.2 %
Date: 2017-11-07 Branches: 30 140 21.4 %

Line Branch Exec Source
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/*	$OpenBSD: mv.c,v 1.45 2017/06/27 21:43:46 tedu Exp $	*/
2
/*	$NetBSD: mv.c,v 1.9 1995/03/21 09:06:52 cgd Exp $	*/
3
4
/*
5
 * Copyright (c) 1989, 1993, 1994
6
 *	The Regents of the University of California.  All rights reserved.
7
 *
8
 * This code is derived from software contributed to Berkeley by
9
 * Ken Smith of The State University of New York at Buffalo.
10
 *
11
 * Redistribution and use in source and binary forms, with or without
12
 * modification, are permitted provided that the following conditions
13
 * are met:
14
 * 1. Redistributions of source code must retain the above copyright
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 *    notice, this list of conditions and the following disclaimer.
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 * 2. Redistributions in binary form must reproduce the above copyright
17
 *    notice, this list of conditions and the following disclaimer in the
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 *    documentation and/or other materials provided with the distribution.
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 * 3. Neither the name of the University nor the names of its contributors
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 *    may be used to endorse or promote products derived from this software
21
 *    without specific prior written permission.
22
 *
23
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33
 * SUCH DAMAGE.
34
 */
35
36
#include <sys/time.h>
37
#include <sys/wait.h>
38
#include <sys/stat.h>
39
#include <sys/mount.h>
40
41
#include <err.h>
42
#include <errno.h>
43
#include <fcntl.h>
44
#include <stdio.h>
45
#include <stdlib.h>
46
#include <string.h>
47
#include <unistd.h>
48
#include <limits.h>
49
#include <pwd.h>
50
#include <grp.h>
51
52
extern char *__progname;
53
54
int fflg, iflg, vflg;
55
int stdin_ok;
56
57
extern int cpmain(int argc, char **argv);
58
extern int rmmain(int argc, char **argv);
59
60
int	mvcopy(char *, char *);
61
int	do_move(char *, char *);
62
int	fastcopy(char *, char *, struct stat *);
63
void	usage(void);
64
65
int
66
main(int argc, char *argv[])
67
{
68
	int baselen, len, rval;
69
	char *p, *endp;
70
38408
	struct stat sb;
71
	int ch;
72
19204
	char path[PATH_MAX];
73
74
38477
	while ((ch = getopt(argc, argv, "ifv")) != -1)
75

69
		switch (ch) {
76
		case 'i':
77
			fflg = 0;
78
			iflg = 1;
79
			break;
80
		case 'f':
81
69
			iflg = 0;
82
69
			fflg = 1;
83
69
			break;
84
		case 'v':
85
			vflg = 1;
86
			break;
87
		default:
88
			usage();
89
		}
90
19204
	argc -= optind;
91
19204
	argv += optind;
92
93
19204
	if (argc < 2)
94
		usage();
95
96
19204
	stdin_ok = isatty(STDIN_FILENO);
97
98
	/*
99
	 * If the stat on the target fails or the target isn't a directory,
100
	 * try the move.  More than 2 arguments is an error in this case.
101
	 */
102

33653
	if (stat(argv[argc - 1], &sb) || !S_ISDIR(sb.st_mode)) {
103
19203
		if (argc > 2)
104
			usage();
105
		exit(do_move(argv[0], argv[1]));
106
	}
107
108
	/* It's a directory, move each file into it. */
109
1
	if (strlcpy(path, argv[argc - 1], sizeof path) >= sizeof path)
110
		errx(1, "%s: destination pathname too long", *argv);
111
1
	baselen = strlen(path);
112
1
	endp = &path[baselen];
113
1
	if (*(endp - 1) != '/') {
114
		*endp++ = '/';
115
		++baselen;
116
	}
117
5302
	for (rval = 0; --argc; ++argv) {
118
2650
		char *current_arg = *argv;
119
120
		/*
121
		 * Get the name of the file to create from
122
		 * the argument. This is a bit tricky because
123
		 * in the case of b/ we actually want b and empty
124
		 * string
125
		 */
126
2650
		if ((p = strrchr(current_arg, '/')) == NULL)
127
2650
			p = current_arg;
128
		else {
129
			/* Special case foo/ */
130
			if (!*(p+1)) {
131
				while (p >= current_arg && *p == '/')
132
					p--;
133
134
				while (p >= current_arg && *p != '/')
135
					p--;
136
			}
137
138
			p++;
139
		}
140
141
2650
		if ((baselen + (len = strlen(p))) >= PATH_MAX) {
142
			warnx("%s: destination pathname too long", *argv);
143
			rval = 1;
144
		} else {
145
2650
			memmove(endp, p, len + 1);
146
2650
			if (do_move(current_arg, path))
147
				rval = 1;
148
		}
149
	}
150
	exit(rval);
151
}
152
153
int
154
do_move(char *from, char *to)
155
{
156
43706
	struct stat sb, fsb;
157
21853
	char modep[15];
158
159
	/* Source path must exist (symlink is OK). */
160
21853
	if (lstat(from, &fsb)) {
161
6
		warn("%s", from);
162
6
		return (1);
163
	}
164
165
	/*
166
	 * (1)	If the destination path exists, the -f option is not specified
167
	 *	and either of the following conditions are true:
168
	 *
169
	 *	(a) The permissions of the destination path do not permit
170
	 *	    writing and the standard input is a terminal.
171
	 *	(b) The -i option is specified.
172
	 *
173
	 *	the mv utility shall write a prompt to standard error and
174
	 *	read a line from standard input.  If the response is not
175
	 *	affirmative, mv shall do nothing more with the current
176
	 *	source file...
177
	 */
178

43631
	if (!fflg && !access(to, F_OK)) {
179
		int ask = 1;
180
		int ch, first;
181
182

14404
		if (iflg && !access(from, F_OK)) {
183
			(void)fprintf(stderr, "overwrite %s? ", to);
184

28775
		} else if (stdin_ok && access(to, W_OK) && !stat(to, &sb)) {
185
			strmode(sb.st_mode, modep);
186
			(void)fprintf(stderr, "override %s%s%s/%s for %s? ",
187
			    modep + 1, modep[9] == ' ' ? "" : " ",
188
			    user_from_uid(sb.st_uid, 0),
189
			    group_from_gid(sb.st_gid, 0), to);
190
		} else
191
			ask = 0;
192
14404
		if (ask) {
193
			first = ch = getchar();
194
			while (ch != '\n' && ch != EOF)
195
				ch = getchar();
196
			if (first != 'y' && first != 'Y')
197
				return (0);
198
		}
199
14404
	}
200
201
	/*
202
	 * (2)	If rename() succeeds, mv shall do nothing more with the
203
	 *	current source file.  If it fails for any other reason than
204
	 *	EXDEV, mv shall write a diagnostic message to the standard
205
	 *	error and do nothing more with the current source file.
206
	 *
207
	 * (3)	If the destination path exists, and it is a file of type
208
	 *	directory and source_file is not a file of type directory,
209
	 *	or it is a file not of type directory, and source file is
210
	 *	a file of type directory, mv shall write a diagnostic
211
	 *	message to standard error, and do nothing more with the
212
	 *	current source file...
213
	 */
214
21847
	if (!rename(from, to)) {
215
21847
		if (vflg)
216
			(void)fprintf(stdout, "%s -> %s\n", from, to);
217
21847
		return (0);
218
	}
219
220
	if (errno != EXDEV) {
221
		warn("rename %s to %s", from, to);
222
		return (1);
223
	}
224
225
	/* Disallow moving a mount point. */
226
	if (S_ISDIR(fsb.st_mode)) {
227
		struct statfs sfs;
228
		char path[PATH_MAX];
229
230
		if (realpath(from, path) == NULL) {
231
			warnx("cannot resolve %s", from);
232
			return (1);
233
		}
234
		if (!statfs(path, &sfs) && !strcmp(path, sfs.f_mntonname)) {
235
			warnx("cannot rename a mount point");
236
			return (1);
237
		}
238
	}
239
240
	/*
241
	 * (4)	If the destination path exists, mv shall attempt to remove it.
242
	 *	If this fails for any reason, mv shall write a diagnostic
243
	 *	message to the standard error and do nothing more with the
244
	 *	current source file...
245
	 */
246
	if (!lstat(to, &sb)) {
247
		if ((S_ISDIR(sb.st_mode)) ? rmdir(to) : unlink(to)) {
248
			warn("can't remove %s", to);
249
			return (1);
250
		}
251
	}
252
253
	/*
254
	 * (5)	The file hierarchy rooted in source_file shall be duplicated
255
	 *	as a file hierarchy rooted in the destination path...
256
	 */
257
	return (S_ISREG(fsb.st_mode) ?
258
	    fastcopy(from, to, &fsb) : mvcopy(from, to));
259
21853
}
260
261
int
262
fastcopy(char *from, char *to, struct stat *sbp)
263
{
264
	struct timespec ts[2];
265
	static u_int32_t blen;
266
	static char *bp;
267
	int nread, from_fd, to_fd;
268
	int badchown = 0, serrno = 0;
269
270
	if (!blen) {
271
		blen = sbp->st_blksize;
272
		if ((bp = malloc(blen)) == NULL) {
273
			warn(NULL);
274
			blen = 0;
275
			return (1);
276
		}
277
	}
278
279
	if ((from_fd = open(from, O_RDONLY, 0)) < 0) {
280
		warn("%s", from);
281
		return (1);
282
	}
283
	if ((to_fd = open(to, O_CREAT | O_TRUNC | O_WRONLY, 0600)) < 0) {
284
		warn("%s", to);
285
		(void)close(from_fd);
286
		return (1);
287
	}
288
289
	if (fchown(to_fd, sbp->st_uid, sbp->st_gid)) {
290
		serrno = errno;
291
		badchown = 1;
292
	}
293
	(void) fchmod(to_fd, sbp->st_mode & ~(S_ISUID|S_ISGID));
294
295
	while ((nread = read(from_fd, bp, blen)) > 0)
296
		if (write(to_fd, bp, nread) != nread) {
297
			warn("%s", to);
298
			goto err;
299
		}
300
	if (nread < 0) {
301
		warn("%s", from);
302
err:		if (unlink(to))
303
			warn("%s: remove", to);
304
		(void)close(from_fd);
305
		(void)close(to_fd);
306
		return (1);
307
	}
308
	(void)close(from_fd);
309
310
	if (badchown) {
311
		if ((sbp->st_mode & (S_ISUID|S_ISGID)))  {
312
			warnc(serrno,
313
			    "%s: set owner/group; not setting setuid/setgid",
314
			    to);
315
			sbp->st_mode &= ~(S_ISUID|S_ISGID);
316
		} else if (!fflg)
317
			warnc(serrno, "%s: set owner/group", to);
318
	}
319
	if (fchmod(to_fd, sbp->st_mode))
320
		warn("%s: set mode", to);
321
322
	/*
323
	 * XXX
324
	 * NFS doesn't support chflags; ignore errors unless there's reason
325
	 * to believe we're losing bits.  (Note, this still won't be right
326
	 * if the server supports flags and we were trying to *remove* flags
327
	 * on a file that we copied, i.e., that we didn't create.)
328
	 */
329
	errno = 0;
330
	if (fchflags(to_fd, sbp->st_flags))
331
		if (errno != EOPNOTSUPP || sbp->st_flags != 0)
332
			warn("%s: set flags", to);
333
334
	ts[0] = sbp->st_atim;
335
	ts[1] = sbp->st_mtim;
336
	if (futimens(to_fd, ts))
337
		warn("%s: set times", to);
338
339
	if (close(to_fd)) {
340
		warn("%s", to);
341
		return (1);
342
	}
343
344
	if (unlink(from)) {
345
		warn("%s: remove", from);
346
		return (1);
347
	}
348
349
	if (vflg)
350
		(void)fprintf(stdout, "%s -> %s\n", from, to);
351
352
	return (0);
353
}
354
355
int
356
mvcopy(char *from, char *to)
357
{
358
	char *argv[3];
359
360
	argv[0] = from;
361
	argv[1] = to;
362
	argv[2] = NULL;
363
	if (cpmain(2, argv)) {
364
		warn("cp failed");
365
		_exit(1);
366
	}
367
368
	argv[0] = from;
369
	argv[1] = NULL;
370
	if (rmmain(1, argv)) {
371
		warn("rm failed");
372
		_exit(1);
373
	}
374
375
	/*
376
	 * XXX
377
	 * The external cpmain(), rmmain() approach (to avoid
378
	 * fork+exec) hides some of the details on what was moved.
379
	 * This can be improved upon during a refactor.
380
	 */
381
	if (vflg)
382
		(void)fprintf(stdout, "%s -> %s\n", from, to);
383
384
	return (0);
385
}
386
387
void
388
usage(void)
389
{
390
	(void)fprintf(stderr, "usage: %s [-fiv] source target\n", __progname);
391
	(void)fprintf(stderr, "       %s [-fiv] source ... directory\n",
392
	    __progname);
393
	exit(1);
394
}