date.c revision 1.65 
1/* $NetBSD: date.c,v 1.65 2023/05/31 17:56:54 kim Exp $ */
2
3/*
4 * Copyright (c) 1985, 1987, 1988, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#if HAVE_NBTOOL_CONFIG_H
33#include "nbtool_config.h"
34#endif
35
36#include <sys/cdefs.h>
37#ifndef lint
38__COPYRIGHT(
39"@(#) Copyright (c) 1985, 1987, 1988, 1993\
40 The Regents of the University of California.  All rights reserved.");
41#endif /* not lint */
42
43#ifndef lint
44#if 0
45static char sccsid[] = "@(#)date.c	8.2 (Berkeley) 4/28/95";
46#else
47__RCSID("$NetBSD: date.c,v 1.65 2023/05/31 17:56:54 kim Exp $");
48#endif
49#endif /* not lint */
50
51#include <sys/param.h>
52#include <sys/time.h>
53
54#include <ctype.h>
55#include <err.h>
56#include <fcntl.h>
57#include <errno.h>
58#include <locale.h>
59#include <stdio.h>
60#include <stdlib.h>
61#include <string.h>
62#include <syslog.h>
63#include <time.h>
64#include <tzfile.h>
65#include <unistd.h>
66#include <util.h>
67#if !HAVE_NBTOOL_CONFIG_H
68#include <utmpx.h>
69#endif
70
71#include "extern.h"
72
73static time_t tval;
74static int Rflag, aflag, jflag, rflag, nflag;
75static char *fmt;
76
77__dead static void badcanotime(const char *, const char *, size_t);
78static void setthetime(const char *);
79__dead static void usage(void);
80
81int
82main(int argc, char *argv[])
83{
84	char *buf;
85	size_t bufsiz;
86	const char *format;
87	int ch;
88	long long val;
89	struct tm *tm;
90
91	setprogname(argv[0]);
92	(void)setlocale(LC_ALL, "");
93
94	while ((ch = getopt(argc, argv, "ad:f:jnRr:u")) != -1) {
95		switch (ch) {
96		case 'a':		/* adjust time slowly */
97			aflag = 1;
98			nflag = 1;
99			break;
100		case 'd':
101#ifndef HAVE_NBTOOL_CONFIG_H
102			rflag = 1;
103			tval = parsedate(optarg, NULL, NULL);
104			if (tval == -1) {
105				errx(EXIT_FAILURE,
106				    "%s: Unrecognized date format", optarg);
107			}
108			break;
109#else
110			errx(EXIT_FAILURE,
111			    "-d not supported in the tool version");
112#endif
113		case 'f':
114			fmt = optarg;
115			break;
116		case 'j':		/* don't set time */
117			jflag = 1;
118			break;
119		case 'n':		/* don't set network */
120			nflag = 1;
121			break;
122		case 'R':		/* RFC-5322 email format */
123			Rflag = 1;
124			break;
125		case 'r':		/* user specified seconds */
126			if (optarg[0] == '\0') {
127				errx(EXIT_FAILURE, "<empty>: Invalid number");
128			}
129			errno = 0;
130			val = strtoll(optarg, &buf, 0);
131			if (errno) {
132				err(EXIT_FAILURE, "%s", optarg);
133			}
134			if (optarg[0] == '\0' || *buf != '\0') {
135				errx(EXIT_FAILURE,
136				    "%s: Invalid number", optarg);
137			}
138			rflag = 1;
139			tval = (time_t)val;
140			break;
141		case 'u':		/* do everything in UTC */
142			(void)setenv("TZ", "UTC0", 1);
143			break;
144		default:
145			usage();
146		}
147	}
148	argc -= optind;
149	argv += optind;
150
151	if (!rflag && time(&tval) == -1)
152		err(EXIT_FAILURE, "time");
153
154
155	/* allow the operands in any order */
156	if (*argv && **argv == '+') {
157		format = *argv;
158		++argv;
159	} else if (Rflag) {
160		(void)setlocale(LC_TIME, "C");
161		format = "+%a, %-e %b %Y %H:%M:%S %z";
162	} else
163		format = "+%a %b %e %H:%M:%S %Z %Y";
164
165	if (*argv) {
166		setthetime(*argv);
167		++argv;
168	} else if (fmt)
169		usage();
170
171	if (*argv && **argv == '+')
172		format = *argv;
173
174	if ((buf = malloc(bufsiz = 1024)) == NULL)
175		goto bad;
176
177	if ((tm = localtime(&tval)) == NULL)
178		err(EXIT_FAILURE, "%lld: localtime", (long long)tval);
179
180	while (strftime(buf, bufsiz, format, tm) == 0)
181		if ((buf = realloc(buf, bufsiz <<= 1)) == NULL)
182			goto bad;
183
184	(void)printf("%s\n", buf + 1);
185	free(buf);
186	return 0;
187bad:
188	err(EXIT_FAILURE, "Cannot allocate format buffer");
189}
190
191static void
192badcanotime(const char *msg, const char *val, size_t where)
193{
194	warnx("%s in canonical time", msg);
195	warnx("%s", val);
196	warnx("%*s", (int)where + 1, "^");
197	usage();
198}
199
200#define ATOI2(s) ((s) += 2, ((s)[-2] - '0') * 10 + ((s)[-1] - '0'))
201
202static void
203setthetime(const char *p)
204{
205	struct timeval tv;
206	time_t new_time;
207	struct tm *lt;
208	const char *dot, *t, *op;
209	size_t len;
210	int yearset;
211
212	if ((lt = localtime(&tval)) == NULL)
213		err(EXIT_FAILURE, "%lld: localtime", (long long)tval);
214
215	lt->tm_isdst = -1;			/* Divine correct DST */
216
217	if (fmt) {
218		t = strptime(p, fmt, lt);
219		if (t == NULL) {
220			warnx("Failed conversion of ``%s''"
221			    " using format ``%s''\n", p, fmt);
222		} else if (*t != '\0')
223			warnx("Ignoring %zu extraneous"
224				" characters in date string (%s)",
225				strlen(t), t);
226		goto setit;
227	}
228	for (t = p, dot = NULL; *t; ++t) {
229		if (*t == '.') {
230			if (dot == NULL) {
231				dot = t;
232			} else {
233				badcanotime("Unexpected dot", p, t - p);
234			}
235		} else if (!isdigit((unsigned char)*t)) {
236			badcanotime("Expected digit", p, t - p);
237		}
238	}
239
240
241	if (dot != NULL) {			/* .ss */
242		len = strlen(dot);
243		if (len > 3) {
244			badcanotime("Unexpected digit after seconds field",
245				    p, strlen(p) - 1);
246		} else if (len < 3) {
247			badcanotime("Expected digit in seconds field",
248				    p, strlen(p));
249		}
250		++dot;
251		lt->tm_sec = ATOI2(dot);
252		if (lt->tm_sec > 61)
253			badcanotime("Seconds out of range", p, strlen(p) - 1);
254	} else {
255		len = 0;
256		lt->tm_sec = 0;
257	}
258
259	op = p;
260	yearset = 0;
261	switch (strlen(p) - len) {
262	case 12:				/* cc */
263		lt->tm_year = ATOI2(p) * 100 - TM_YEAR_BASE;
264		if (lt->tm_year < 0)
265			badcanotime("Year before 1900", op, p - op + 1);
266		yearset = 1;
267		/* FALLTHROUGH */
268	case 10:				/* yy */
269		if (yearset) {
270			lt->tm_year += ATOI2(p);
271		} else {
272			yearset = ATOI2(p);
273			if (yearset < 69)
274				lt->tm_year = yearset + 2000 - TM_YEAR_BASE;
275			else
276				lt->tm_year = yearset + 1900 - TM_YEAR_BASE;
277		}
278		/* FALLTHROUGH */
279	case 8:					/* mm */
280		lt->tm_mon = ATOI2(p);
281		if (lt->tm_mon > 12 || lt->tm_mon == 0)
282			badcanotime("Month out of range", op, p - op - 1);
283		--lt->tm_mon;			/* time struct is 0 - 11 */
284		/* FALLTHROUGH */
285	case 6:					/* dd */
286		lt->tm_mday = ATOI2(p);
287		switch (lt->tm_mon) {
288		case 0:
289		case 2:
290		case 4:
291		case 6:
292		case 7:
293		case 9:
294		case 11:
295			if (lt->tm_mday > 31 || lt->tm_mday == 0)
296				badcanotime("Day out of range (max 31)",
297					    op, p - op - 1);
298			break;
299		case 3:
300		case 5:
301		case 8:
302		case 10:
303			if (lt->tm_mday > 30 || lt->tm_mday == 0)
304				badcanotime("Day out of range (max 30)",
305					    op, p - op - 1);
306			break;
307		case 1:
308			if (isleap(lt->tm_year + TM_YEAR_BASE)) {
309				if (lt->tm_mday > 29 || lt->tm_mday == 0) {
310					badcanotime("Day out of range "
311						    "(max 29)",
312						    op, p - op - 1);
313				}
314			} else {
315				if (lt->tm_mday > 28 || lt->tm_mday == 0) {
316					badcanotime("Day out of range "
317						    "(max 28)",
318						    op, p - op - 1);
319				}
320			}
321			break;
322		default:
323			/*
324			 * If the month was given, it's already been
325			 * checked.  If a bad value came back from
326			 * localtime, something's badly broken.
327			 * (make this an assertion?)
328			 */
329			errx(EXIT_FAILURE, "localtime gave invalid month %d",
330			    lt->tm_mon);
331		}
332		/* FALLTHROUGH */
333	case 4:					/* hh */
334		lt->tm_hour = ATOI2(p);
335		if (lt->tm_hour > 23)
336			badcanotime("Hour out of range", op, p - op - 1);
337		/* FALLTHROUGH */
338	case 2:					/* mm */
339		lt->tm_min = ATOI2(p);
340		if (lt->tm_min > 59)
341			badcanotime("Minute out of range", op, p - op - 1);
342		break;
343	case 0:					/* was just .sss */
344		if (len != 0)
345			break;
346		/* FALLTHROUGH */
347	default:
348	    if (strlen(p) - len > 12) {
349		    badcanotime("Too many digits", p, 12);
350	    } else {
351		    badcanotime("Not enough digits", p, strlen(p) - len);
352	    }
353	}
354setit:
355	/* convert broken-down time to UTC clock time */
356	if ((new_time = mktime(lt)) == -1) {
357		/* Can this actually happen? */
358		err(EXIT_FAILURE, "mktime");
359	}
360
361	/* if jflag is set, don't actually change the time, just return */
362	if (jflag) {
363		tval = new_time;
364		return;
365	}
366
367	/* set the time */
368#ifndef HAVE_NBTOOL_CONFIG_H
369	struct utmpx utx;
370	memset(&utx, 0, sizeof(utx));
371	utx.ut_type = OLD_TIME;
372	(void)gettimeofday(&utx.ut_tv, NULL);
373	pututxline(&utx);
374
375	if (nflag || netsettime(new_time)) {
376		logwtmp("|", "date", "");
377		if (aflag) {
378			tv.tv_sec = new_time - tval;
379			tv.tv_usec = 0;
380			if (adjtime(&tv, NULL))
381				err(EXIT_FAILURE, "adjtime");
382		} else {
383			tval = new_time;
384			tv.tv_sec = tval;
385			tv.tv_usec = 0;
386			if (settimeofday(&tv, NULL))
387				err(EXIT_FAILURE, "settimeofday");
388		}
389		logwtmp("{", "date", "");
390	}
391	utx.ut_type = NEW_TIME;
392	(void)gettimeofday(&utx.ut_tv, NULL);
393	pututxline(&utx);
394
395	if ((p = getlogin()) == NULL)
396		p = "???";
397	syslog(LOG_AUTH | LOG_NOTICE, "date set by %s", p);
398#else
399	errx(EXIT_FAILURE, "Can't set the time in the tools version");
400#endif
401}
402
403static void
404usage(void)
405{
406	(void)fprintf(stderr,
407	    "Usage: %s [-ajnRu] [-d date] [-r seconds] [+format]",
408	    getprogname());
409	(void)fprintf(stderr, " [[[[[[CC]yy]mm]dd]HH]MM[.SS]]\n");
410	(void)fprintf(stderr,
411	    "       %s [-ajnRu] -f input_format new_date [+format]\n",
412	    getprogname());
413	exit(EXIT_FAILURE);
414	/* NOTREACHED */
415}
416