bin/date/date.c

   1 /*-
   2  * Copyright (c) 1985, 1987, 1988, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 4. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29
  30 #ifndef lint
  31 static char const copyright[] =
  32 "@(#) Copyright (c) 1985, 1987, 1988, 1993\n\
  33         The Regents of the University of California.  All rights reserved.\n";
  34 #endif /* not lint */
  35
  36 #if 0
  37 #ifndef lint
  38 static char sccsid[] = "@(#)date.c      8.2 (Berkeley) 4/28/95";
  39 #endif /* not lint */
  40 #endif
  41
  42 #include <sys/cdefs.h>
  43 __FBSDID("$FreeBSD$");
  44
  45 #include <sys/param.h>
  46 #include <sys/time.h>
  47 #include <sys/stat.h>
  48
  49 #include <ctype.h>
  50 #include <err.h>
  51 #include <locale.h>
  52 #include <stdio.h>
  53 #include <stdlib.h>
  54 #include <string.h>
  55 #include <syslog.h>
  56 #include <unistd.h>
  57 #include <utmpx.h>
  58
  59 #include "extern.h"
  60 #include "vary.h"
  61
  62 #ifndef TM_YEAR_BASE
  63 #define TM_YEAR_BASE    1900
  64 #endif
  65
  66 static time_t tval;
  67 int retval;
  68
  69 static void setthetime(const char *, const char *, int, int);
  70 static void badformat(void);
  71 static void usage(void);
  72
  73 static const char *rfc2822_format = "%a, %d %b %Y %T %z";
  74
  75 int
  76 main(int argc, char *argv[])
  77 {
  78         struct timezone tz;
  79         int ch, rflag;
  80         int jflag, nflag, Rflag;
  81         const char *format;
  82         char buf[1024];
  83         char *endptr, *fmt;
  84         char *tmp;
  85         int set_timezone;
  86         struct vary *v;
  87         const struct vary *badv;
  88         struct tm lt;
  89         struct stat sb;
  90
  91         v = NULL;
  92         fmt = NULL;
  93         (void) setlocale(LC_TIME, "");
  94         tz.tz_dsttime = tz.tz_minuteswest = 0;
  95         rflag = 0;
  96         jflag = nflag = Rflag = 0;
  97         set_timezone = 0;
  98         while ((ch = getopt(argc, argv, "d:f:jnRr:t:uv:")) != -1)
  99                 switch((char)ch) {
 100                 case 'd':               /* daylight savings time */
 101                         tz.tz_dsttime = strtol(optarg, &endptr, 10) ? 1 : 0;
 102                         if (endptr == optarg || *endptr != '\0')
 103                                 usage();
 104                         set_timezone = 1;
 105                         break;
 106                 case 'f':
 107                         fmt = optarg;
 108                         break;
 109                 case 'j':
 110                         jflag = 1;      /* don't set time */
 111                         break;
 112                 case 'n':               /* don't set network */
 113                         nflag = 1;
 114                         break;
 115                 case 'R':               /* RFC 2822 datetime format */
 116                         Rflag = 1;
 117                         break;
 118                 case 'r':               /* user specified seconds */
 119                         rflag = 1;
 120                         tval = strtoq(optarg, &tmp, 0);
 121                         if (*tmp != 0) {
 122                                 if (stat(optarg, &sb) == 0)
 123                                         tval = sb.st_mtim.tv_sec;
 124                                 else
 125                                         usage();
 126                         }
 127                         break;
 128                 case 't':               /* minutes west of UTC */
 129                                         /* error check; don't allow "PST" */
 130                         tz.tz_minuteswest = strtol(optarg, &endptr, 10);
 131                         if (endptr == optarg || *endptr != '\0')
 132                                 usage();
 133                         set_timezone = 1;
 134                         break;
 135                 case 'u':               /* do everything in UTC */
 136                         (void)setenv("TZ", "UTC0", 1);
 137                         break;
 138                 case 'v':
 139                         v = vary_append(v, optarg);
 140                         break;
 141                 default:
 142                         usage();
 143                 }
 144         argc -= optind;
 145         argv += optind;
 146
 147         /*
 148          * If -d or -t, set the timezone or daylight savings time; this
 149          * doesn't belong here; the kernel should not know about either.
 150          */
 151         if (set_timezone && settimeofday(NULL, &tz) != 0)
 152                 err(1, "settimeofday (timezone)");
 153
 154         if (!rflag && time(&tval) == -1)
 155                 err(1, "time");
 156
 157         format = "%+";
 158
 159         if (Rflag)
 160                 format = rfc2822_format;
 161
 162         /* allow the operands in any order */
 163         if (*argv && **argv == '+') {
 164                 format = *argv + 1;
 165                 ++argv;
 166         }
 167
 168         if (*argv) {
 169                 setthetime(fmt, *argv, jflag, nflag);
 170                 ++argv;
 171         } else if (fmt != NULL)
 172                 usage();
 173
 174         if (*argv && **argv == '+')
 175                 format = *argv + 1;
 176
 177         lt = *localtime(&tval);
 178         badv = vary_apply(v, &lt);
 179         if (badv) {
 180                 fprintf(stderr, "%s: Cannot apply date adjustment\n",
 181                         badv->arg);
 182                 vary_destroy(v);
 183                 usage();
 184         }
 185         vary_destroy(v);
 186
 187         if (format == rfc2822_format)
 188                 /*
 189                  * When using RFC 2822 datetime format, don't honor the
 190                  * locale.
 191                  */
 192                 setlocale(LC_TIME, "C");
 193
 194         (void)strftime(buf, sizeof(buf), format, &lt);
 195         (void)printf("%s\n", buf);
 196         if (fflush(stdout))
 197                 err(1, "stdout");
 198         exit(retval);
 199 }
 200
 201 #define ATOI2(s)        ((s) += 2, ((s)[-2] - '0') * 10 + ((s)[-1] - '0'))
 202
 203 static void
 204 setthetime(const char *fmt, const char *p, int jflag, int nflag)
 205 {
 206         struct utmpx utx;
 207         struct tm *lt;
 208         struct timeval tv;
 209         const char *dot, *t;
 210         int century;
 211
 212         lt = localtime(&tval);
 213         lt->tm_isdst = -1;              /* divine correct DST */
 214
 215         if (fmt != NULL) {
 216                 t = strptime(p, fmt, lt);
 217                 if (t == NULL) {
 218                         fprintf(stderr, "Failed conversion of ``%s''"
 219                                 " using format ``%s''\n", p, fmt);
 220                         badformat();
 221                 } else if (*t != '\0')
 222                         fprintf(stderr, "Warning: Ignoring %ld extraneous"
 223                                 " characters in date string (%s)\n",
 224                                 (long) strlen(t), t);
 225         } else {
 226                 for (t = p, dot = NULL; *t; ++t) {
 227                         if (isdigit(*t))
 228                                 continue;
 229                         if (*t == '.' && dot == NULL) {
 230                                 dot = t;
 231                                 continue;
 232                         }
 233                         badformat();
 234                 }
 235
 236                 if (dot != NULL) {                      /* .ss */
 237                         dot++; /* *dot++ = '\0'; */
 238                         if (strlen(dot) != 2)
 239                                 badformat();
 240                         lt->tm_sec = ATOI2(dot);
 241                         if (lt->tm_sec > 61)
 242                                 badformat();
 243                 } else
 244                         lt->tm_sec = 0;
 245
 246                 century = 0;
 247                 /* if p has a ".ss" field then let's pretend it's not there */
 248                 switch (strlen(p) - ((dot != NULL) ? 3 : 0)) {
 249                 case 12:                                /* cc */
 250                         lt->tm_year = ATOI2(p) * 100 - TM_YEAR_BASE;
 251                         century = 1;
 252                         /* FALLTHROUGH */
 253                 case 10:                                /* yy */
 254                         if (century)
 255                                 lt->tm_year += ATOI2(p);
 256                         else {
 257                                 lt->tm_year = ATOI2(p);
 258                                 if (lt->tm_year < 69)   /* hack for 2000 ;-} */
 259                                         lt->tm_year += 2000 - TM_YEAR_BASE;
 260                                 else
 261                                         lt->tm_year += 1900 - TM_YEAR_BASE;
 262                         }
 263                         /* FALLTHROUGH */
 264                 case 8:                                 /* mm */
 265                         lt->tm_mon = ATOI2(p);
 266                         if (lt->tm_mon > 12)
 267                                 badformat();
 268                         --lt->tm_mon;           /* time struct is 0 - 11 */
 269                         /* FALLTHROUGH */
 270                 case 6:                                 /* dd */
 271                         lt->tm_mday = ATOI2(p);
 272                         if (lt->tm_mday > 31)
 273                                 badformat();
 274                         /* FALLTHROUGH */
 275                 case 4:                                 /* HH */
 276                         lt->tm_hour = ATOI2(p);
 277                         if (lt->tm_hour > 23)
 278                                 badformat();
 279                         /* FALLTHROUGH */
 280                 case 2:                                 /* MM */
 281                         lt->tm_min = ATOI2(p);
 282                         if (lt->tm_min > 59)
 283                                 badformat();
 284                         break;
 285                 default:
 286                         badformat();
 287                 }
 288         }
 289
 290         /* convert broken-down time to GMT clock time */
 291         if ((tval = mktime(lt)) == -1)
 292                 errx(1, "nonexistent time");
 293
 294         if (!jflag) {
 295                 /* set the time */
 296                 if (nflag || netsettime(tval)) {
 297                         utx.ut_type = OLD_TIME;
 298                         (void)gettimeofday(&utx.ut_tv, NULL);
 299                         pututxline(&utx);
 300                         tv.tv_sec = tval;
 301                         tv.tv_usec = 0;
 302                         if (settimeofday(&tv, NULL) != 0)
 303                                 err(1, "settimeofday (timeval)");
 304                         utx.ut_type = NEW_TIME;
 305                         (void)gettimeofday(&utx.ut_tv, NULL);
 306                         pututxline(&utx);
 307                 }
 308
 309                 if ((p = getlogin()) == NULL)
 310                         p = "???";
 311                 syslog(LOG_AUTH | LOG_NOTICE, "date set by %s", p);
 312         }
 313 }
 314
 315 static void
 316 badformat(void)
 317 {
 318         warnx("illegal time format");
 319         usage();
 320 }
 321
 322 static void
 323 usage(void)
 324 {
 325         (void)fprintf(stderr, "%s\n%s\n",
 326             "usage: date [-jnRu] [-d dst] [-r seconds] [-t west] "
 327             "[-v[+|-]val[ymwdHMS]] ... ",
 328             "            "
 329             "[-f fmt date | [[[[[cc]yy]mm]dd]HH]MM[.ss]] [+format]");
 330         exit(1);
 331 }