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: src/bin/date/date.c,v 1.47 2005/01/10 08:39:21 imp Exp $");
  44
  45 #include <sys/param.h>
  46 #include <sys/time.h>
  47
  48 #include <ctype.h>
  49 #include <err.h>
  50 #include <locale.h>
  51 #ifndef __APPLE__
  52 #include <libutil.h>
  53 #endif /* !__APPLE__ */
  54 #include <stdio.h>
  55 #include <stdlib.h>
  56 #include <string.h>
  57 #include <syslog.h>
  58 #include <unistd.h>
  59 #include <utmpx.h>
  60
  61 #ifdef __APPLE__
  62 #include <get_compat.h>
  63 #include <util.h>
  64 #else
  65 #define COMPAT_MODE(a,b) (1)
  66 #endif /* __APPLE__ */
  67
  68 #include "extern.h"
  69 #include "vary.h"
  70
  71 #ifndef TM_YEAR_BASE
  72 #define TM_YEAR_BASE    1900
  73 #endif
  74
  75 static time_t tval;
  76 int retval;
  77 int unix2003_std = 0;   /* to determine legacy vs std mode */
  78
  79 static void setthetime(const char *, const char *, int, int);
  80 static void badformat(void);
  81 static void usage(void);
  82
  83 int
  84 main(int argc, char *argv[])
  85 {
  86         struct timezone tz;
  87         int ch, rflag;
  88         int jflag, nflag;
  89         const char *format;
  90         char buf[1024];
  91         char *endptr, *fmt;
  92         char *tmp;
  93         int set_timezone;
  94         struct vary *v;
  95         const struct vary *badv;
  96         struct tm lt;
  97
  98         unix2003_std = COMPAT_MODE("bin/date", "unix2003");     /* Determine the STD */
  99
 100         v = NULL;
 101         fmt = NULL;
 102         (void) setlocale(LC_TIME, "");
 103         tz.tz_dsttime = tz.tz_minuteswest = 0;
 104         rflag = 0;
 105         jflag = nflag = 0;
 106         set_timezone = 0;
 107         while ((ch = getopt(argc, argv, "d:f:jnr:t:uv:")) != -1)
 108                 switch((char)ch) {
 109                 case 'd':               /* daylight savings time */
 110                         tz.tz_dsttime = strtol(optarg, &endptr, 10) ? 1 : 0;
 111                         if (endptr == optarg || *endptr != '\0')
 112                                 usage();
 113                         set_timezone = 1;
 114                         break;
 115                 case 'f':
 116                         fmt = optarg;
 117                         break;
 118                 case 'j':
 119                         jflag = 1;      /* don't set time */
 120                         break;
 121                 case 'n':               /* don't set network */
 122                         nflag = 1;
 123                         break;
 124                 case 'r':               /* user specified seconds */
 125                         rflag = 1;
 126                         tval = strtoq(optarg, &tmp, 0);
 127                         if (*tmp != 0)
 128                                 usage();
 129                         break;
 130                 case 't':               /* minutes west of UTC */
 131                                         /* error check; don't allow "PST" */
 132                         tz.tz_minuteswest = strtol(optarg, &endptr, 10);
 133                         if (endptr == optarg || *endptr != '\0')
 134                                 usage();
 135                         set_timezone = 1;
 136                         break;
 137                 case 'u':               /* do everything in UTC */
 138                         (void)setenv("TZ", "UTC0", 1);
 139                         break;
 140                 case 'v':
 141                         v = vary_append(v, optarg);
 142                         break;
 143                 default:
 144                         usage();
 145                 }
 146         argc -= optind;
 147         argv += optind;
 148
 149         /*
 150          * If -d or -t, set the timezone or daylight savings time; this
 151          * doesn't belong here; the kernel should not know about either.
 152          */
 153         if (set_timezone && settimeofday((struct timeval *)NULL, &tz))
 154                 err(1, "settimeofday (timezone)");
 155
 156         if (!rflag && time(&tval) == -1)
 157                 err(1, "time");
 158
 159         format = "%+";
 160
 161         /* allow the operands in any order */
 162         if (*argv && **argv == '+') {
 163                 format = *argv + 1;
 164                 ++argv;
 165         }
 166
 167         if (*argv) {
 168                 setthetime(fmt, *argv, jflag, nflag);
 169                 ++argv;
 170         } else if (fmt != NULL)
 171                 usage();
 172
 173         if (*argv && **argv == '+')
 174                 format = *argv + 1;
 175
 176 #ifdef __APPLE__
 177         /* 7999711 */
 178         struct tm *ltp = localtime(&tval);
 179         if (ltp == NULL) {
 180                 err(1, "localtime");
 181         }
 182         lt = *ltp;
 183 #else
 184         lt = *localtime(&tval);
 185 #endif
 186         badv = vary_apply(v, &lt);
 187         if (badv) {
 188                 fprintf(stderr, "%s: Cannot apply date adjustment\n",
 189                         badv->arg);
 190                 vary_destroy(v);
 191                 usage();
 192         }
 193         vary_destroy(v);
 194         (void)strftime(buf, sizeof(buf), format, &lt);
 195         (void)printf("%s\n", buf);
 196         if (fflush(stdout))
 197                 err(1, "stdout");
 198         /*
 199          * If date/time could not be set/notified in the other hosts as
 200          * determined by netsetval(), a return value 2 is set, which is
 201          * only propagated back to shell in legacy mode.
 202          */
 203         if (unix2003_std)
 204                 exit(0);
 205         exit(retval);
 206 }
 207
 208 #define ATOI2(s)        ((s) += 2, ((s)[-2] - '0') * 10 + ((s)[-1] - '0'))
 209 #define ATOI2_OFFSET(s, o)      (((s)[o] - '0') * 10 + ((s)[o + 1] - '0'))
 210
 211 static void
 212 setthetime(const char *fmt, const char *p, int jflag, int nflag)
 213 {
 214         struct tm *lt;
 215         const char *dot, *t;
 216         int century;
 217         size_t length;
 218
 219         if (fmt != NULL) {
 220                 lt = localtime(&tval);
 221                 t = strptime(p, fmt, lt);
 222                 if (t == NULL) {
 223                         fprintf(stderr, "Failed conversion of ``%s''"
 224                                 " using format ``%s''\n", p, fmt);
 225                         badformat();
 226                 } else if (*t != '\0')
 227                         fprintf(stderr, "Warning: Ignoring %ld extraneous"
 228                                 " characters in date string (%s)\n",
 229                                 (long) strlen(t), t);
 230         } else {
 231                 for (t = p, dot = NULL; *t; ++t) {
 232                         if (isdigit(*t))
 233                                 continue;
 234                         if (*t == '.' && dot == NULL) {
 235                                 dot = t;
 236                                 continue;
 237                         }
 238                         badformat();
 239                 }
 240
 241                 lt = localtime(&tval);
 242
 243                 if (dot != NULL) {                      /* .ss */
 244                         dot++; /* *dot++ = '\0'; */
 245                         if (strlen(dot) != 2)
 246                                 badformat();
 247                         lt->tm_sec = ATOI2(dot);
 248                         if (lt->tm_sec > 61)
 249                                 badformat();
 250                 } else
 251                         lt->tm_sec = 0;
 252
 253                 century = 0;
 254                 /* if p has a ".ss" field then let's pretend it's not there */
 255                 switch (length = strlen(p) - ((dot != NULL) ? 3 : 0)) {
 256                 case 12:                                /* cc */
 257                         lt->tm_year = (unix2003_std ? ATOI2_OFFSET(p, length - 4) : ATOI2(p)) * 100 - TM_YEAR_BASE;
 258                         century = 1;
 259                         /* FALLTHROUGH */
 260                 case 10:                                /* yy */
 261                         if (century)
 262                                 lt->tm_year += (unix2003_std ? ATOI2_OFFSET(p, length - 2) : ATOI2(p));
 263                         else {
 264                                 lt->tm_year = (unix2003_std ? ATOI2_OFFSET(p, length - 2) : ATOI2(p));
 265                                 if (lt->tm_year < 69)   /* hack for 2000 ;-} */
 266                                         lt->tm_year += 2000 - TM_YEAR_BASE;
 267                                 else
 268                                         lt->tm_year += 1900 - TM_YEAR_BASE;
 269                         }
 270                         /* FALLTHROUGH */
 271                 case 8:                                 /* mm */
 272                         lt->tm_mon = ATOI2(p);
 273                         if (lt->tm_mon > 12)
 274                                 badformat();
 275                         --lt->tm_mon;           /* time struct is 0 - 11 */
 276                         /* FALLTHROUGH */
 277                 case 6:                                 /* dd */
 278                         lt->tm_mday = ATOI2(p);
 279                         if (lt->tm_mday > 31)
 280                                 badformat();
 281                         /* FALLTHROUGH */
 282                 case 4:                                 /* HH */
 283                         lt->tm_hour = ATOI2(p);
 284                         if (lt->tm_hour > 23)
 285                                 badformat();
 286                         /* FALLTHROUGH */
 287                 case 2:                                 /* MM */
 288                         lt->tm_min = ATOI2(p);
 289                         if (lt->tm_min > 59)
 290                                 badformat();
 291                         break;
 292                 default:
 293                         badformat();
 294                 }
 295         }
 296
 297         /* Let mktime() decide whether summer time is in effect. */
 298         lt->tm_isdst = -1;
 299
 300         /* convert broken-down time to GMT clock time */
 301         if ((tval = mktime(lt)) == -1)
 302                 errx(1, "nonexistent time");
 303
 304         if (!jflag) {
 305                 /* set the time */
 306                 if (nflag || netsettime(tval)) {
 307                         struct utmpx ut;
 308                         bzero(&ut, sizeof(ut));
 309                         ut.ut_type = OLD_TIME;
 310                         (void)gettimeofday(&ut.ut_tv, NULL);
 311                         pututxline(&ut);
 312                         ut.ut_tv.tv_sec = tval;
 313                         ut.ut_tv.tv_usec = 0;
 314                         if (settimeofday(&ut.ut_tv, NULL))
 315                                 err(1, "settimeofday (timeval)");
 316                         ut.ut_type = NEW_TIME;
 317                         pututxline(&ut);
 318                 }
 319
 320                 if ((p = getlogin()) == NULL)
 321                         p = "???";
 322                 syslog(LOG_AUTH | LOG_NOTICE, "date set by %s", p);
 323         }
 324 }
 325
 326 static void
 327 badformat(void)
 328 {
 329         warnx("illegal time format");
 330         usage();
 331 }
 332
 333 static void
 334 usage(void)
 335 {
 336         (void)fprintf(stderr, "%s\n%s\n",
 337             "usage: date [-jnu] [-d dst] [-r seconds] [-t west] "
 338             "[-v[+|-]val[ymwdHMS]] ... ",
 339                 unix2003_std ? "            "
 340             "[-f fmt date | [[[mm]dd]HH]MM[[cc]yy][.ss]] [+format]" :
 341             "            "
 342             "[-f fmt date | [[[[[cc]yy]mm]dd]HH]MM[.ss]] [+format]");
 343         exit(1);
 344 }