touch.c revision 1.10 
1/*	$OpenBSD: touch.c,v 1.10 2003/06/10 22:20:53 deraadt Exp $	*/
2/*	$NetBSD: touch.c,v 1.11 1995/08/31 22:10:06 jtc Exp $	*/
3
4/*
5 * Copyright (c) 1993
6 *	The Regents of the University of California.  All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 *    may be used to endorse or promote products derived from this software
18 *    without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33#ifndef lint
34static char copyright[] =
35"@(#) Copyright (c) 1993\n\
36	The Regents of the University of California.  All rights reserved.\n";
37#endif /* not lint */
38
39#ifndef lint
40#if 0
41static char sccsid[] = "@(#)touch.c	8.2 (Berkeley) 4/28/95";
42#endif
43static char rcsid[] = "$OpenBSD: touch.c,v 1.10 2003/06/10 22:20:53 deraadt Exp $";
44#endif /* not lint */
45
46#include <sys/types.h>
47#include <sys/stat.h>
48#include <sys/time.h>
49
50#include <err.h>
51#include <errno.h>
52#include <fcntl.h>
53#include <stdio.h>
54#include <stdlib.h>
55#include <string.h>
56#include <locale.h>
57#include <time.h>
58#include <tzfile.h>
59#include <unistd.h>
60
61int	rw(char *, struct stat *, int);
62void	stime_arg1(char *, struct timeval *);
63void	stime_arg2(char *, int, struct timeval *);
64void	stime_file(char *, struct timeval *);
65void	usage(void);
66
67int
68main(int argc, char *argv[])
69{
70	struct stat sb;
71	struct timeval tv[2];
72	int aflag, cflag, fflag, mflag, ch, fd, len, rval, timeset;
73	char *p;
74
75	setlocale(LC_ALL, "");
76
77	aflag = cflag = fflag = mflag = timeset = 0;
78	if (gettimeofday(&tv[0], NULL))
79		err(1, "gettimeofday");
80
81	while ((ch = getopt(argc, argv, "acfmr:t:")) != -1)
82		switch(ch) {
83		case 'a':
84			aflag = 1;
85			break;
86		case 'c':
87			cflag = 1;
88			break;
89		case 'f':
90			fflag = 1;
91			break;
92		case 'm':
93			mflag = 1;
94			break;
95		case 'r':
96			timeset = 1;
97			stime_file(optarg, tv);
98			break;
99		case 't':
100			timeset = 1;
101			stime_arg1(optarg, tv);
102			break;
103		case '?':
104		default:
105			usage();
106		}
107	argc -= optind;
108	argv += optind;
109
110	/* Default is both -a and -m. */
111	if (aflag == 0 && mflag == 0)
112		aflag = mflag = 1;
113
114	/*
115	 * If no -r or -t flag, at least two operands, the first of which
116	 * is an 8 or 10 digit number, use the obsolete time specification.
117	 */
118	if (!timeset && argc > 1) {
119		(void)strtol(argv[0], &p, 10);
120		len = p - argv[0];
121		if (*p == '\0' && (len == 8 || len == 10)) {
122			timeset = 1;
123			stime_arg2(*argv++, len == 10, tv);
124		}
125	}
126
127	/* Otherwise use the current time of day. */
128	if (!timeset)
129		tv[1] = tv[0];
130
131	if (*argv == NULL)
132		usage();
133
134	for (rval = 0; *argv; ++argv) {
135		/* See if the file exists. */
136		if (stat(*argv, &sb)) {
137			if (!cflag) {
138				/* Create the file. */
139				fd = open(*argv,
140				    O_WRONLY | O_CREAT, DEFFILEMODE);
141				if (fd == -1 || fstat(fd, &sb) || close(fd)) {
142					rval = 1;
143					warn("%s", *argv);
144					continue;
145				}
146
147				/* If using the current time, we're done. */
148				if (!timeset)
149					continue;
150			} else
151				continue;
152		}
153
154		if (!aflag)
155			TIMESPEC_TO_TIMEVAL(&tv[0], &sb.st_atimespec);
156		if (!mflag)
157			TIMESPEC_TO_TIMEVAL(&tv[1], &sb.st_mtimespec);
158
159		/* Try utimes(2). */
160		if (!utimes(*argv, tv))
161			continue;
162
163		/* If the user specified a time, nothing else we can do. */
164		if (timeset) {
165			rval = 1;
166			warn("%s", *argv);
167		}
168
169		/*
170		 * System V and POSIX 1003.1 require that a NULL argument
171		 * set the access/modification times to the current time.
172		 * The permission checks are different, too, in that the
173		 * ability to write the file is sufficient.  Take a shot.
174		 */
175		 if (!utimes(*argv, NULL))
176			continue;
177
178		/* Try reading/writing. */
179		if (rw(*argv, &sb, fflag))
180			rval = 1;
181	}
182	exit(rval);
183}
184
185#define	ATOI2(s)	((s) += 2, ((s)[-2] - '0') * 10 + ((s)[-1] - '0'))
186
187void
188stime_arg1(char *arg, struct timeval *tvp)
189{
190	struct tm *t;
191	time_t tmptime;
192	int yearset;
193	char *p;
194					/* Start with the current time. */
195	tmptime = tvp[0].tv_sec;
196	if ((t = localtime(&tmptime)) == NULL)
197		err(1, "localtime");
198					/* [[CC]YY]MMDDhhmm[.SS] */
199	if ((p = strchr(arg, '.')) == NULL)
200		t->tm_sec = 0;		/* Seconds defaults to 0. */
201	else {
202		if (strlen(p + 1) != 2)
203			goto terr;
204		*p++ = '\0';
205		t->tm_sec = ATOI2(p);
206	}
207
208	yearset = 0;
209	switch(strlen(arg)) {
210	case 12:			/* CCYYMMDDhhmm */
211		t->tm_year = ATOI2(arg) * 100 - TM_YEAR_BASE;
212		yearset = 1;
213		/* FALLTHROUGH */
214	case 10:			/* YYMMDDhhmm */
215		if (yearset) {
216			yearset = ATOI2(arg);
217			t->tm_year += yearset;
218		} else {
219			yearset = ATOI2(arg);
220			if (yearset < 69)
221				t->tm_year = yearset + 2000 - TM_YEAR_BASE;
222			else
223				t->tm_year = yearset + 1900 - TM_YEAR_BASE;
224		}
225		/* FALLTHROUGH */
226	case 8:				/* MMDDhhmm */
227		t->tm_mon = ATOI2(arg);
228		--t->tm_mon;		/* Convert from 01-12 to 00-11 */
229		t->tm_mday = ATOI2(arg);
230		t->tm_hour = ATOI2(arg);
231		t->tm_min = ATOI2(arg);
232		break;
233	default:
234		goto terr;
235	}
236
237	t->tm_isdst = -1;		/* Figure out DST. */
238	tvp[0].tv_sec = tvp[1].tv_sec = mktime(t);
239	if (tvp[0].tv_sec == -1)
240terr:		errx(1,
241	"out of range or illegal time specification: [[CC]YY]MMDDhhmm[.SS]");
242
243	tvp[0].tv_usec = tvp[1].tv_usec = 0;
244}
245
246void
247stime_arg2(char *arg, int year, struct timeval *tvp)
248{
249	struct tm *t;
250	time_t tmptime;
251					/* Start with the current time. */
252	tmptime = tvp[0].tv_sec;
253	if ((t = localtime(&tmptime)) == NULL)
254		err(1, "localtime");
255
256	t->tm_mon = ATOI2(arg);		/* MMDDhhmm[YY] */
257	--t->tm_mon;			/* Convert from 01-12 to 00-11 */
258	t->tm_mday = ATOI2(arg);
259	t->tm_hour = ATOI2(arg);
260	t->tm_min = ATOI2(arg);
261	if (year) {
262		year = ATOI2(arg);
263		if (year < 69)
264			t->tm_year = year + 2000 - TM_YEAR_BASE;
265		else
266			t->tm_year = year + 1900 - TM_YEAR_BASE;
267	}
268	t->tm_sec = 0;
269
270	t->tm_isdst = -1;		/* Figure out DST. */
271	tvp[0].tv_sec = tvp[1].tv_sec = mktime(t);
272	if (tvp[0].tv_sec == -1)
273		errx(1,
274	"out of range or illegal time specification: MMDDhhmm[YY]");
275
276	tvp[0].tv_usec = tvp[1].tv_usec = 0;
277}
278
279void
280stime_file(char *fname, struct timeval *tvp)
281{
282	struct stat sb;
283
284	if (stat(fname, &sb))
285		err(1, "%s", fname);
286	TIMESPEC_TO_TIMEVAL(tvp, &sb.st_atimespec);
287	TIMESPEC_TO_TIMEVAL(tvp + 1, &sb.st_mtimespec);
288}
289
290int
291rw(char *fname, struct stat *sbp, int force)
292{
293	int fd, needed_chmod, rval;
294	u_char byte;
295
296	/* Try regular files and directories. */
297	if (!S_ISREG(sbp->st_mode) && !S_ISDIR(sbp->st_mode)) {
298		warnx("%s: %s", fname, strerror(EFTYPE));
299		return (1);
300	}
301
302	needed_chmod = rval = 0;
303	if ((fd = open(fname, O_RDWR, 0)) == -1) {
304		if (!force || chmod(fname, DEFFILEMODE))
305			goto err;
306		if ((fd = open(fname, O_RDWR, 0)) == -1)
307			goto err;
308		needed_chmod = 1;
309	}
310
311	if (sbp->st_size != 0) {
312		if (read(fd, &byte, sizeof(byte)) != sizeof(byte))
313			goto err;
314		if (lseek(fd, (off_t)0, SEEK_SET) == -1)
315			goto err;
316		if (write(fd, &byte, sizeof(byte)) != sizeof(byte))
317			goto err;
318	} else {
319		if (write(fd, &byte, sizeof(byte)) != sizeof(byte)) {
320err:			rval = 1;
321			warn("%s", fname);
322		} else if (ftruncate(fd, (off_t)0)) {
323			rval = 1;
324			warn("%s: file modified", fname);
325		}
326	}
327
328	if (close(fd) && rval != 1) {
329		rval = 1;
330		warn("%s", fname);
331	}
332	if (needed_chmod && chmod(fname, sbp->st_mode) && rval != 1) {
333		rval = 1;
334		warn("%s: permissions modified", fname);
335	}
336	return (rval);
337}
338
339__dead void
340usage(void)
341{
342	(void)fprintf(stderr,
343	    "usage: touch [-acfm] [-r file] [-t time] file ...\n");
344	exit(1);
345}
346