1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
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 #ifndef lint
33 static char const copyright[] =
34 "@(#) Copyright (c) 1985, 1987, 1988, 1993\n\
35 The Regents of the University of California. All rights reserved.\n";
36 #endif /* not lint */
37
38 #if 0
39 #ifndef lint
40 static char sccsid[] = "@(#)date.c 8.2 (Berkeley) 4/28/95";
41 #endif /* not lint */
42 #endif
43
44 #include <sys/cdefs.h>
45 __FBSDID("$FreeBSD$");
46
47 #include <sys/param.h>
48 #include <sys/time.h>
49 #include <sys/stat.h>
50
51 #include <ctype.h>
52 #include <err.h>
53 #include <locale.h>
54 #include <stdbool.h>
55 #include <stdio.h>
56 #include <stdlib.h>
57 #include <string.h>
58 #include <syslog.h>
59 #include <unistd.h>
60 #include <utmpx.h>
61
62 #include "extern.h"
63 #include "vary.h"
64
65 #ifndef TM_YEAR_BASE
66 #define TM_YEAR_BASE 1900
67 #endif
68
69 static time_t tval;
70 int retval;
71
72 static void badformat(void);
73 static void iso8601_usage(const char *);
74 static void multipleformats(void);
75 static void printdate(const char *);
76 static void printisodate(struct tm *);
77 static void setthetime(const char *, const char *, int, int);
78 static void usage(void);
79
80 static const struct iso8601_fmt {
81 const char *refname;
82 const char *format_string;
83 } iso8601_fmts[] = {
84 { "date", "%Y-%m-%d" },
85 { "hours", "T%H" },
86 { "minutes", ":%M" },
87 { "seconds", ":%S" },
88 };
89 static const struct iso8601_fmt *iso8601_selected;
90
91 static const char *rfc2822_format = "%a, %d %b %Y %T %z";
92
93 int
main(int argc,char * argv[])94 main(int argc, char *argv[])
95 {
96 struct timezone tz;
97 int ch, rflag;
98 bool Iflag, jflag, nflag, Rflag;
99 const char *format;
100 char buf[1024];
101 char *endptr, *fmt;
102 char *tmp;
103 int set_timezone;
104 struct vary *v;
105 const struct vary *badv;
106 struct tm *lt;
107 struct stat sb;
108 size_t i;
109
110 v = NULL;
111 fmt = NULL;
112 (void) setlocale(LC_TIME, "");
113 tz.tz_dsttime = tz.tz_minuteswest = 0;
114 rflag = 0;
115 Iflag = jflag = nflag = Rflag = 0;
116 set_timezone = 0;
117 while ((ch = getopt(argc, argv, "d:f:I::jnRr:t:uv:")) != -1)
118 switch((char)ch) {
119 case 'd': /* daylight savings time */
120 tz.tz_dsttime = strtol(optarg, &endptr, 10) ? 1 : 0;
121 if (endptr == optarg || *endptr != '\0')
122 usage();
123 set_timezone = 1;
124 break;
125 case 'f':
126 fmt = optarg;
127 break;
128 case 'I':
129 if (Rflag)
130 multipleformats();
131 Iflag = 1;
132 if (optarg == NULL) {
133 iso8601_selected = iso8601_fmts;
134 break;
135 }
136 for (i = 0; i < nitems(iso8601_fmts); i++)
137 if (strcmp(optarg, iso8601_fmts[i].refname) == 0)
138 break;
139 if (i == nitems(iso8601_fmts))
140 iso8601_usage(optarg);
141
142 iso8601_selected = &iso8601_fmts[i];
143 break;
144 case 'j':
145 jflag = 1; /* don't set time */
146 break;
147 case 'n': /* don't set network */
148 nflag = 1;
149 break;
150 case 'R': /* RFC 2822 datetime format */
151 if (Iflag)
152 multipleformats();
153 Rflag = 1;
154 break;
155 case 'r': /* user specified seconds */
156 rflag = 1;
157 tval = strtoq(optarg, &tmp, 0);
158 if (*tmp != 0) {
159 if (stat(optarg, &sb) == 0)
160 tval = sb.st_mtim.tv_sec;
161 else
162 usage();
163 }
164 break;
165 case 't': /* minutes west of UTC */
166 /* error check; don't allow "PST" */
167 tz.tz_minuteswest = strtol(optarg, &endptr, 10);
168 if (endptr == optarg || *endptr != '\0')
169 usage();
170 set_timezone = 1;
171 break;
172 case 'u': /* do everything in UTC */
173 (void)setenv("TZ", "UTC0", 1);
174 break;
175 case 'v':
176 v = vary_append(v, optarg);
177 break;
178 default:
179 usage();
180 }
181 argc -= optind;
182 argv += optind;
183
184 /*
185 * If -d or -t, set the timezone or daylight savings time; this
186 * doesn't belong here; the kernel should not know about either.
187 */
188 if (set_timezone && settimeofday(NULL, &tz) != 0)
189 err(1, "settimeofday (timezone)");
190
191 if (!rflag && time(&tval) == -1)
192 err(1, "time");
193
194 format = "%+";
195
196 if (Rflag)
197 format = rfc2822_format;
198
199 /* allow the operands in any order */
200 if (*argv && **argv == '+') {
201 if (Iflag)
202 multipleformats();
203 format = *argv + 1;
204 ++argv;
205 }
206
207 if (*argv) {
208 setthetime(fmt, *argv, jflag, nflag);
209 ++argv;
210 } else if (fmt != NULL)
211 usage();
212
213 if (*argv && **argv == '+') {
214 if (Iflag)
215 multipleformats();
216 format = *argv + 1;
217 }
218
219 lt = localtime(&tval);
220 if (lt == NULL)
221 errx(1, "invalid time");
222 badv = vary_apply(v, lt);
223 if (badv) {
224 fprintf(stderr, "%s: Cannot apply date adjustment\n",
225 badv->arg);
226 vary_destroy(v);
227 usage();
228 }
229 vary_destroy(v);
230
231 if (Iflag)
232 printisodate(lt);
233
234 if (format == rfc2822_format)
235 /*
236 * When using RFC 2822 datetime format, don't honor the
237 * locale.
238 */
239 setlocale(LC_TIME, "C");
240
241 (void)strftime(buf, sizeof(buf), format, lt);
242 printdate(buf);
243 }
244
245 static void
printdate(const char * buf)246 printdate(const char *buf)
247 {
248 (void)printf("%s\n", buf);
249 if (fflush(stdout))
250 err(1, "stdout");
251 exit(retval);
252 }
253
254 static void
printisodate(struct tm * lt)255 printisodate(struct tm *lt)
256 {
257 const struct iso8601_fmt *it;
258 char fmtbuf[32], buf[32], tzbuf[8];
259
260 fmtbuf[0] = 0;
261 for (it = iso8601_fmts; it <= iso8601_selected; it++)
262 strlcat(fmtbuf, it->format_string, sizeof(fmtbuf));
263
264 (void)strftime(buf, sizeof(buf), fmtbuf, lt);
265
266 if (iso8601_selected > iso8601_fmts) {
267 (void)strftime(tzbuf, sizeof(tzbuf), "%z", lt);
268 memmove(&tzbuf[4], &tzbuf[3], 3);
269 tzbuf[3] = ':';
270 strlcat(buf, tzbuf, sizeof(buf));
271 }
272
273 printdate(buf);
274 }
275
276 #define ATOI2(s) ((s) += 2, ((s)[-2] - '0') * 10 + ((s)[-1] - '0'))
277
278 static void
setthetime(const char * fmt,const char * p,int jflag,int nflag)279 setthetime(const char *fmt, const char *p, int jflag, int nflag)
280 {
281 struct utmpx utx;
282 struct tm *lt;
283 struct timeval tv;
284 const char *dot, *t;
285 int century;
286
287 lt = localtime(&tval);
288 if (lt == NULL)
289 errx(1, "invalid time");
290 lt->tm_isdst = -1; /* divine correct DST */
291
292 if (fmt != NULL) {
293 t = strptime(p, fmt, lt);
294 if (t == NULL) {
295 fprintf(stderr, "Failed conversion of ``%s''"
296 " using format ``%s''\n", p, fmt);
297 badformat();
298 } else if (*t != '\0')
299 fprintf(stderr, "Warning: Ignoring %ld extraneous"
300 " characters in date string (%s)\n",
301 (long) strlen(t), t);
302 } else {
303 for (t = p, dot = NULL; *t; ++t) {
304 if (isdigit(*t))
305 continue;
306 if (*t == '.' && dot == NULL) {
307 dot = t;
308 continue;
309 }
310 badformat();
311 }
312
313 if (dot != NULL) { /* .ss */
314 dot++; /* *dot++ = '\0'; */
315 if (strlen(dot) != 2)
316 badformat();
317 lt->tm_sec = ATOI2(dot);
318 if (lt->tm_sec > 61)
319 badformat();
320 } else
321 lt->tm_sec = 0;
322
323 century = 0;
324 /* if p has a ".ss" field then let's pretend it's not there */
325 switch (strlen(p) - ((dot != NULL) ? 3 : 0)) {
326 case 12: /* cc */
327 lt->tm_year = ATOI2(p) * 100 - TM_YEAR_BASE;
328 century = 1;
329 /* FALLTHROUGH */
330 case 10: /* yy */
331 if (century)
332 lt->tm_year += ATOI2(p);
333 else {
334 lt->tm_year = ATOI2(p);
335 if (lt->tm_year < 69) /* hack for 2000 ;-} */
336 lt->tm_year += 2000 - TM_YEAR_BASE;
337 else
338 lt->tm_year += 1900 - TM_YEAR_BASE;
339 }
340 /* FALLTHROUGH */
341 case 8: /* mm */
342 lt->tm_mon = ATOI2(p);
343 if (lt->tm_mon > 12)
344 badformat();
345 --lt->tm_mon; /* time struct is 0 - 11 */
346 /* FALLTHROUGH */
347 case 6: /* dd */
348 lt->tm_mday = ATOI2(p);
349 if (lt->tm_mday > 31)
350 badformat();
351 /* FALLTHROUGH */
352 case 4: /* HH */
353 lt->tm_hour = ATOI2(p);
354 if (lt->tm_hour > 23)
355 badformat();
356 /* FALLTHROUGH */
357 case 2: /* MM */
358 lt->tm_min = ATOI2(p);
359 if (lt->tm_min > 59)
360 badformat();
361 break;
362 default:
363 badformat();
364 }
365 }
366
367 /* convert broken-down time to GMT clock time */
368 if ((tval = mktime(lt)) == -1)
369 errx(1, "nonexistent time");
370
371 if (!jflag) {
372 /* set the time */
373 if (nflag || netsettime(tval)) {
374 utx.ut_type = OLD_TIME;
375 memset(utx.ut_id, 0, sizeof(utx.ut_id));
376 (void)gettimeofday(&utx.ut_tv, NULL);
377 pututxline(&utx);
378 tv.tv_sec = tval;
379 tv.tv_usec = 0;
380 if (settimeofday(&tv, NULL) != 0)
381 err(1, "settimeofday (timeval)");
382 utx.ut_type = NEW_TIME;
383 (void)gettimeofday(&utx.ut_tv, NULL);
384 pututxline(&utx);
385 }
386
387 if ((p = getlogin()) == NULL)
388 p = "???";
389 syslog(LOG_AUTH | LOG_NOTICE, "date set by %s", p);
390 }
391 }
392
393 static void
badformat(void)394 badformat(void)
395 {
396 warnx("illegal time format");
397 usage();
398 }
399
400 static void
iso8601_usage(const char * badarg)401 iso8601_usage(const char *badarg)
402 {
403 errx(1, "invalid argument '%s' for -I", badarg);
404 }
405
406 static void
multipleformats(void)407 multipleformats(void)
408 {
409 errx(1, "multiple output formats specified");
410 }
411
412 static void
usage(void)413 usage(void)
414 {
415 (void)fprintf(stderr, "%s\n%s\n%s\n",
416 "usage: date [-jnRu] [-d dst] [-r seconds|file] [-t west] "
417 "[-v[+|-]val[ymwdHMS]]",
418 " "
419 "[-I[date | hours | minutes | seconds]]",
420 " "
421 "[-f fmt date | [[[[[cc]yy]mm]dd]HH]MM[.ss]] [+format]"
422 );
423 exit(1);
424 }
425