1/* $NetBSD: date.c,v 1.61 2014/09/01 21:42:21 dholland 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#include <sys/cdefs.h>
33#ifndef lint
34__COPYRIGHT(
35"@(#) Copyright (c) 1985, 1987, 1988, 1993\
36 The Regents of the University of California. All rights reserved.");
37#endif /* not lint */
38
39#ifndef lint
40#if 0
41static char sccsid[] = "@(#)date.c 8.2 (Berkeley) 4/28/95";
42#else
43__RCSID("$NetBSD: date.c,v 1.61 2014/09/01 21:42:21 dholland Exp $");
44#endif
45#endif /* not lint */
46
47#include <sys/param.h>
48#include <sys/time.h>
49
50#include <ctype.h>
51#include <err.h>
52#include <fcntl.h>
53#include <errno.h>
54#include <locale.h>
55#include <stdio.h>
56#include <stdlib.h>
57#include <string.h>
58#include <syslog.h>
59#include <time.h>
60#include <tzfile.h>
61#include <unistd.h>
62#include <util.h>
63
64#include "extern.h"
65
66static time_t tval;
67static int aflag, jflag, rflag, nflag;
68
69__dead static void badcanotime(const char *, const char *, size_t);
70static void setthetime(const char *);
71__dead static void usage(void);
72
73int
74main(int argc, char *argv[])
75{
76 char *buf;
77 size_t bufsiz;
78 const char *format;
79 int ch;
80 long long val;
81 struct tm *tm;
82
83 setprogname(argv[0]);
84 (void)setlocale(LC_ALL, "");
85
86 while ((ch = getopt(argc, argv, "ad:jnr:u")) != -1) {
87 switch (ch) {
88 case 'a': /* adjust time slowly */
89 aflag = 1;
90 nflag = 1;
91 break;
92 case 'd':
93 rflag = 1;
94 tval = parsedate(optarg, NULL, NULL);
95 if (tval == -1) {
96 errx(EXIT_FAILURE,
97 "%s: Unrecognized date format", optarg);
98 }
99 break;
100 case 'j': /* don't set time */
101 jflag = 1;
102 break;
103 case 'n': /* don't set network */
104 nflag = 1;
105 break;
106 case 'r': /* user specified seconds */
107 if (optarg[0] == '\0') {
108 errx(EXIT_FAILURE, "<empty>: Invalid number");
109 }
110 errno = 0;
111 val = strtoll(optarg, &buf, 0);
112 if (errno) {
113 err(EXIT_FAILURE, "%s", optarg);
114 }
115 if (optarg[0] == '\0' || *buf != '\0') {
116 errx(EXIT_FAILURE,
117 "%s: Invalid number", optarg);
118 }
119 rflag = 1;
120 tval = (time_t)val;
121 break;
122 case 'u': /* do everything in UTC */
123 (void)setenv("TZ", "UTC0", 1);
124 break;
125 default:
126 usage();
127 }
128 }
129 argc -= optind;
130 argv += optind;
131
132 if (!rflag && time(&tval) == -1)
133 err(EXIT_FAILURE, "time");
134
135
136 /* allow the operands in any order */
137 if (*argv && **argv == '+') {
138 format = *argv;
139 ++argv;
140 } else
141 format = "+%a %b %e %H:%M:%S %Z %Y";
142
143 if (*argv) {
144 setthetime(*argv);
145 ++argv;
146 }
147
148 if (*argv && **argv == '+')
149 format = *argv;
150
151 if ((buf = malloc(bufsiz = 1024)) == NULL)
152 goto bad;
153
154 if ((tm = localtime(&tval)) == NULL)
155 err(EXIT_FAILURE, "%lld: localtime", (long long)tval);
156
157 while (strftime(buf, bufsiz, format, tm) == 0)
158 if ((buf = realloc(buf, bufsiz <<= 1)) == NULL)
159 goto bad;
160
161 (void)printf("%s\n", buf + 1);
162 free(buf);
163 return 0;
164bad:
165 err(EXIT_FAILURE, "Cannot allocate format buffer");
166}
167
168static void
169badcanotime(const char *msg, const char *val, size_t where)
170{
171 warnx("%s in canonical time", msg);
172 warnx("%s", val);
173 warnx("%*s", (int)where + 1, "^");
174 usage();
175}
176
177#define ATOI2(s) ((s) += 2, ((s)[-2] - '0') * 10 + ((s)[-1] - '0'))
178
179static void
180setthetime(const char *p)
181{
182 struct timeval tv;
183 time_t new_time;
184 struct tm *lt;
185 const char *dot, *t, *op;
186 size_t len;
187 int yearset;
188
189 for (t = p, dot = NULL; *t; ++t) {
190 if (*t == '.') {
191 if (dot == NULL) {
192 dot = t;
193 } else {
194 badcanotime("Unexpected dot", p, t - p);
195 }
196 } else if (!isdigit((unsigned char)*t)) {
197 badcanotime("Expected digit", p, t - p);
198 }
199 }
200
201 if ((lt = localtime(&tval)) == NULL)
202 err(EXIT_FAILURE, "%lld: localtime", (long long)tval);
203
204 lt->tm_isdst = -1; /* Divine correct DST */
205
206 if (dot != NULL) { /* .ss */
207 len = strlen(dot);
208 if (len > 3) {
209 badcanotime("Unexpected digit after seconds field",
210 p, strlen(p) - 1);
211 } else if (len < 3) {
212 badcanotime("Expected digit in seconds field",
213 p, strlen(p));
214 }
215 ++dot;
216 lt->tm_sec = ATOI2(dot);
217 if (lt->tm_sec > 61)
218 badcanotime("Seconds out of range", p, strlen(p) - 1);
219 } else {
220 len = 0;
221 lt->tm_sec = 0;
222 }
223
224 op = p;
225 yearset = 0;
226 switch (strlen(p) - len) {
227 case 12: /* cc */
228 lt->tm_year = ATOI2(p) * 100 - TM_YEAR_BASE;
229 if (lt->tm_year < 0)
230 badcanotime("Year before 1900", op, p - op + 1);
231 yearset = 1;
232 /* FALLTHROUGH */
233 case 10: /* yy */
234 if (yearset) {
235 lt->tm_year += ATOI2(p);
236 } else {
237 yearset = ATOI2(p);
238 if (yearset < 69)
239 lt->tm_year = yearset + 2000 - TM_YEAR_BASE;
240 else
241 lt->tm_year = yearset + 1900 - TM_YEAR_BASE;
242 }
243 /* FALLTHROUGH */
244 case 8: /* mm */
245 lt->tm_mon = ATOI2(p);
246 if (lt->tm_mon > 12 || lt->tm_mon == 0)
247 badcanotime("Month out of range", op, p - op - 1);
248 --lt->tm_mon; /* time struct is 0 - 11 */
249 /* FALLTHROUGH */
250 case 6: /* dd */
251 lt->tm_mday = ATOI2(p);
252 switch (lt->tm_mon) {
253 case 0:
254 case 2:
255 case 4:
256 case 6:
257 case 7:
258 case 9:
259 case 11:
260 if (lt->tm_mday > 31 || lt->tm_mday == 0)
261 badcanotime("Day out of range (max 31)",
262 op, p - op - 1);
263 break;
264 case 3:
265 case 5:
266 case 8:
267 case 10:
268 if (lt->tm_mday > 30 || lt->tm_mday == 0)
269 badcanotime("Day out of range (max 30)",
270 op, p - op - 1);
271 break;
272 case 1:
273 if (isleap(lt->tm_year + TM_YEAR_BASE)) {
274 if (lt->tm_mday > 29 || lt->tm_mday == 0) {
275 badcanotime("Day out of range "
276 "(max 29)",
277 op, p - op - 1);
278 }
279 } else {
280 if (lt->tm_mday > 28 || lt->tm_mday == 0) {
281 badcanotime("Day out of range "
282 "(max 28)",
283 op, p - op - 1);
284 }
285 }
286 break;
287 default:
288 /*
289 * If the month was given, it's already been
290 * checked. If a bad value came back from
291 * localtime, something's badly broken.
292 * (make this an assertion?)
293 */
294 errx(EXIT_FAILURE, "localtime gave invalid month %d",
295 lt->tm_mon);
296 }
297 /* FALLTHROUGH */
298 case 4: /* hh */
299 lt->tm_hour = ATOI2(p);
300 if (lt->tm_hour > 23)
301 badcanotime("Hour out of range", op, p - op - 1);
302 /* FALLTHROUGH */
303 case 2: /* mm */
304 lt->tm_min = ATOI2(p);
305 if (lt->tm_min > 59)
306 badcanotime("Minute out of range", op, p - op - 1);
307 break;
308 case 0: /* was just .sss */
309 if (len != 0)
310 break;
311 /* FALLTHROUGH */
312 default:
313 if (strlen(p) - len > 12) {
314 badcanotime("Too many digits", p, 12);
315 } else {
316 badcanotime("Not enough digits", p, strlen(p) - len);
317 }
318 }
319
320 /* convert broken-down time to UTC clock time */
321 if ((new_time = mktime(lt)) == -1) {
322 /* Can this actually happen? */
323 err(EXIT_FAILURE, "%s: mktime", op);
324 }
325
326 /* if jflag is set, don't actually change the time, just return */
327 if (jflag) {
328 tval = new_time;
329 return;
330 }
331
332 /* set the time */
333 if (nflag || netsettime(new_time)) {
334 logwtmp("|", "date", "");
335 if (aflag) {
336 tv.tv_sec = new_time - tval;
337 tv.tv_usec = 0;
338 if (adjtime(&tv, NULL))
339 err(EXIT_FAILURE, "adjtime");
340 } else {
341 tval = new_time;
342 tv.tv_sec = tval;
343 tv.tv_usec = 0;
344 if (settimeofday(&tv, NULL))
345 err(EXIT_FAILURE, "settimeofday");
346 }
347 logwtmp("{", "date", "");
348 }
349
350 if ((p = getlogin()) == NULL)
351 p = "???";
352 syslog(LOG_AUTH | LOG_NOTICE, "date set by %s", p);
353}
354
355static void
356usage(void)
357{
358 (void)fprintf(stderr,
359 "Usage: %s [-ajnu] [-d date] [-r seconds] [+format]",
360 getprogname());
361 (void)fprintf(stderr, " [[[[[[CC]yy]mm]dd]HH]MM[.SS]]\n");
362 exit(EXIT_FAILURE);
363 /* NOTREACHED */
364}
365