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
41 static 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
66 static time_t tval;
67 static int aflag, jflag, rflag, nflag;
68
69 __dead static void badcanotime(const char *, const char *, size_t);
70 static void setthetime(const char *);
71 __dead static void usage(void);
72
73 int
main(int argc,char * argv[])74 main(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 #if !defined(__minix)
94 rflag = 1;
95 tval = parsedate(optarg, NULL, NULL);
96 if (tval == -1) {
97 errx(EXIT_FAILURE,
98 "%s: Unrecognized date format", optarg);
99 }
100 #else
101 errx(EXIT_FAILURE,
102 "%s: Unrecognized date format", optarg);
103 #endif /* !defined(__minix) */
104 break;
105 case 'j': /* don't set time */
106 jflag = 1;
107 break;
108 case 'n': /* don't set network */
109 nflag = 1;
110 break;
111 case 'r': /* user specified seconds */
112 if (optarg[0] == '\0') {
113 errx(EXIT_FAILURE, "<empty>: Invalid number");
114 }
115 errno = 0;
116 val = strtoll(optarg, &buf, 0);
117 if (errno) {
118 err(EXIT_FAILURE, "%s", optarg);
119 }
120 if (optarg[0] == '\0' || *buf != '\0') {
121 errx(EXIT_FAILURE,
122 "%s: Invalid number", optarg);
123 }
124 rflag = 1;
125 tval = (time_t)val;
126 break;
127 case 'u': /* do everything in UTC */
128 (void)setenv("TZ", "UTC0", 1);
129 break;
130 default:
131 usage();
132 }
133 }
134 argc -= optind;
135 argv += optind;
136
137 if (!rflag && time(&tval) == -1)
138 err(EXIT_FAILURE, "time");
139
140
141 /* allow the operands in any order */
142 if (*argv && **argv == '+') {
143 format = *argv;
144 ++argv;
145 } else
146 format = "+%a %b %e %H:%M:%S %Z %Y";
147
148 if (*argv) {
149 setthetime(*argv);
150 ++argv;
151 }
152
153 if (*argv && **argv == '+')
154 format = *argv;
155
156 if ((buf = malloc(bufsiz = 1024)) == NULL)
157 goto bad;
158
159 if ((tm = localtime(&tval)) == NULL)
160 err(EXIT_FAILURE, "%lld: localtime", (long long)tval);
161
162 while (strftime(buf, bufsiz, format, tm) == 0)
163 if ((buf = realloc(buf, bufsiz <<= 1)) == NULL)
164 goto bad;
165
166 (void)printf("%s\n", buf + 1);
167 free(buf);
168 return 0;
169 bad:
170 err(EXIT_FAILURE, "Cannot allocate format buffer");
171 }
172
173 static void
badcanotime(const char * msg,const char * val,size_t where)174 badcanotime(const char *msg, const char *val, size_t where)
175 {
176 warnx("%s in canonical time", msg);
177 warnx("%s", val);
178 warnx("%*s", (int)where + 1, "^");
179 usage();
180 }
181
182 #define ATOI2(s) ((s) += 2, ((s)[-2] - '0') * 10 + ((s)[-1] - '0'))
183
184 static void
setthetime(const char * p)185 setthetime(const char *p)
186 {
187 struct timeval tv;
188 time_t new_time;
189 struct tm *lt;
190 const char *dot, *t, *op;
191 size_t len;
192 int yearset;
193
194 for (t = p, dot = NULL; *t; ++t) {
195 if (*t == '.') {
196 if (dot == NULL) {
197 dot = t;
198 } else {
199 badcanotime("Unexpected dot", p, t - p);
200 }
201 } else if (!isdigit((unsigned char)*t)) {
202 badcanotime("Expected digit", p, t - p);
203 }
204 }
205
206 if ((lt = localtime(&tval)) == NULL)
207 err(EXIT_FAILURE, "%lld: localtime", (long long)tval);
208
209 lt->tm_isdst = -1; /* Divine correct DST */
210
211 if (dot != NULL) { /* .ss */
212 len = strlen(dot);
213 if (len > 3) {
214 badcanotime("Unexpected digit after seconds field",
215 p, strlen(p) - 1);
216 } else if (len < 3) {
217 badcanotime("Expected digit in seconds field",
218 p, strlen(p));
219 }
220 ++dot;
221 lt->tm_sec = ATOI2(dot);
222 if (lt->tm_sec > 61)
223 badcanotime("Seconds out of range", p, strlen(p) - 1);
224 } else {
225 len = 0;
226 lt->tm_sec = 0;
227 }
228
229 op = p;
230 yearset = 0;
231 switch (strlen(p) - len) {
232 case 12: /* cc */
233 lt->tm_year = ATOI2(p) * 100 - TM_YEAR_BASE;
234 if (lt->tm_year < 0)
235 badcanotime("Year before 1900", op, p - op + 1);
236 yearset = 1;
237 /* FALLTHROUGH */
238 case 10: /* yy */
239 if (yearset) {
240 lt->tm_year += ATOI2(p);
241 } else {
242 yearset = ATOI2(p);
243 if (yearset < 69)
244 lt->tm_year = yearset + 2000 - TM_YEAR_BASE;
245 else
246 lt->tm_year = yearset + 1900 - TM_YEAR_BASE;
247 }
248 /* FALLTHROUGH */
249 case 8: /* mm */
250 lt->tm_mon = ATOI2(p);
251 if (lt->tm_mon > 12 || lt->tm_mon == 0)
252 badcanotime("Month out of range", op, p - op - 1);
253 --lt->tm_mon; /* time struct is 0 - 11 */
254 /* FALLTHROUGH */
255 case 6: /* dd */
256 lt->tm_mday = ATOI2(p);
257 switch (lt->tm_mon) {
258 case 0:
259 case 2:
260 case 4:
261 case 6:
262 case 7:
263 case 9:
264 case 11:
265 if (lt->tm_mday > 31 || lt->tm_mday == 0)
266 badcanotime("Day out of range (max 31)",
267 op, p - op - 1);
268 break;
269 case 3:
270 case 5:
271 case 8:
272 case 10:
273 if (lt->tm_mday > 30 || lt->tm_mday == 0)
274 badcanotime("Day out of range (max 30)",
275 op, p - op - 1);
276 break;
277 case 1:
278 if (isleap(lt->tm_year + TM_YEAR_BASE)) {
279 if (lt->tm_mday > 29 || lt->tm_mday == 0) {
280 badcanotime("Day out of range "
281 "(max 29)",
282 op, p - op - 1);
283 }
284 } else {
285 if (lt->tm_mday > 28 || lt->tm_mday == 0) {
286 badcanotime("Day out of range "
287 "(max 28)",
288 op, p - op - 1);
289 }
290 }
291 break;
292 default:
293 /*
294 * If the month was given, it's already been
295 * checked. If a bad value came back from
296 * localtime, something's badly broken.
297 * (make this an assertion?)
298 */
299 errx(EXIT_FAILURE, "localtime gave invalid month %d",
300 lt->tm_mon);
301 }
302 /* FALLTHROUGH */
303 case 4: /* hh */
304 lt->tm_hour = ATOI2(p);
305 if (lt->tm_hour > 23)
306 badcanotime("Hour out of range", op, p - op - 1);
307 /* FALLTHROUGH */
308 case 2: /* mm */
309 lt->tm_min = ATOI2(p);
310 if (lt->tm_min > 59)
311 badcanotime("Minute out of range", op, p - op - 1);
312 break;
313 case 0: /* was just .sss */
314 if (len != 0)
315 break;
316 /* FALLTHROUGH */
317 default:
318 if (strlen(p) - len > 12) {
319 badcanotime("Too many digits", p, 12);
320 } else {
321 badcanotime("Not enough digits", p, strlen(p) - len);
322 }
323 }
324
325 /* convert broken-down time to UTC clock time */
326 if ((new_time = mktime(lt)) == -1) {
327 /* Can this actually happen? */
328 err(EXIT_FAILURE, "%s: mktime", op);
329 }
330
331 /* if jflag is set, don't actually change the time, just return */
332 if (jflag) {
333 tval = new_time;
334 return;
335 }
336
337 /* set the time */
338 if (nflag || netsettime(new_time)) {
339 logwtmp("|", "date", "");
340 if (aflag) {
341 tv.tv_sec = new_time - tval;
342 tv.tv_usec = 0;
343 if (adjtime(&tv, NULL))
344 err(EXIT_FAILURE, "adjtime");
345 } else {
346 tval = new_time;
347 tv.tv_sec = tval;
348 tv.tv_usec = 0;
349 if (settimeofday(&tv, NULL))
350 err(EXIT_FAILURE, "settimeofday");
351 }
352 logwtmp("{", "date", "");
353 }
354
355 if ((p = getlogin()) == NULL)
356 p = "???";
357 syslog(LOG_AUTH | LOG_NOTICE, "date set by %s", p);
358 }
359
360 static void
usage(void)361 usage(void)
362 {
363 (void)fprintf(stderr,
364 "Usage: %s [-ajnu] [-d date] [-r seconds] [+format]",
365 getprogname());
366 (void)fprintf(stderr, " [[[[[[CC]yy]mm]dd]HH]MM[.SS]]\n");
367 exit(EXIT_FAILURE);
368 /* NOTREACHED */
369 }
370