bin/date/date.c

   1 /* $NetBSD: date.c,v 1.60 2011/08/27 12:55:09 joerg 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 1.60 2011/08/27 12:55:09 joerg 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 badformat(void);
  70 __dead static void badtime(void);
  71 __dead static void badvalue(const char *);
  72 static void setthetime(const char *);
  73 __dead static void usage(void);
  74
  75 int
  76 main(int argc, char *argv[])
  77 {
  78         char *buf;
  79         size_t bufsiz;
  80         const char *format;
  81         int ch;
  82         long long val;
  83         struct tm *tm;
  84
  85         setprogname(argv[0]);
  86         (void)setlocale(LC_ALL, "");
  87
  88         while ((ch = getopt(argc, argv, "ad:jnr:u")) != -1) {
  89                 switch (ch) {
  90                 case 'a':               /* adjust time slowly */
  91                         aflag = 1;
  92                         nflag = 1;
  93                         break;
  94                 case 'd':
  95 #ifndef __minix
  96                         rflag = 1;
  97                         tval = parsedate(optarg, NULL, NULL);
  98                         if (tval == -1)
  99 #endif
 100 badarg:                          errx(EXIT_FAILURE,
 101                                     "Cannot parse `%s'", optarg);
 102                         break;
 103                 case 'j':               /* don't set time */
 104                         jflag = 1;
 105                         break;
 106                 case 'n':               /* don't set network */
 107                         nflag = 1;
 108                         break;
 109                 case 'r':               /* user specified seconds */
 110                         errno = 0;
 111                         val = strtoll(optarg, &buf, 0);
 112                         if (optarg[0] == '\0' || *buf != '\0')
 113                                 goto badarg;
 114                         if (errno == ERANGE && (val == LLONG_MAX ||
 115                             val == LLONG_MIN))
 116                                 err(EXIT_FAILURE, "Bad number `%s'", optarg);
 117                         rflag = 1;
 118                         tval = (time_t)val;
 119                         break;
 120                 case 'u':               /* do everything in UTC */
 121                         (void)setenv("TZ", "UTC0", 1);
 122                         break;
 123                 default:
 124                         usage();
 125                 }
 126         }
 127         argc -= optind;
 128         argv += optind;
 129
 130         if (!rflag && time(&tval) == -1)
 131                 err(EXIT_FAILURE, "time");
 132
 133
 134         /* allow the operands in any order */
 135         if (*argv && **argv == '+') {
 136                 format = *argv;
 137                 ++argv;
 138         } else
 139                 format = "+%a %b %e %H:%M:%S %Z %Y";
 140
 141         if (*argv) {
 142                 setthetime(*argv);
 143                 ++argv;
 144         }
 145
 146         if (*argv && **argv == '+')
 147                 format = *argv;
 148
 149         if ((buf = malloc(bufsiz = 1024)) == NULL)
 150                 goto bad;
 151
 152         if ((tm = localtime(&tval)) == NULL)
 153                 err(EXIT_FAILURE, "localtime %lld failed", (long long)tval);
 154
 155         while (strftime(buf, bufsiz, format, tm) == 0)
 156                 if ((buf = realloc(buf, bufsiz <<= 1)) == NULL)
 157                         goto bad;
 158
 159         (void)printf("%s\n", buf + 1);
 160         free(buf);
 161         return 0;
 162 bad:
 163         err(EXIT_FAILURE, "Cannot allocate format buffer");
 164 }
 165
 166 static void
 167 badformat(void)
 168 {
 169         warnx("illegal time format");
 170         usage();
 171 }
 172
 173 static void
 174 badtime(void)
 175 {
 176         errx(EXIT_FAILURE, "illegal time");
 177         /* NOTREACHED */
 178 }
 179
 180 static void
 181 badvalue(const char *param)
 182 {
 183         warnx("invalid %s supplied", param);
 184         usage();
 185 }
 186
 187 #define ATOI2(s) ((s) += 2, ((s)[-2] - '0') * 10 + ((s)[-1] - '0'))
 188
 189 static void
 190 setthetime(const char *p)
 191 {
 192         struct timeval tv;
 193         time_t new_time;
 194         struct tm *lt;
 195         const char *dot, *t;
 196         size_t len;
 197         int yearset;
 198
 199         for (t = p, dot = NULL; *t; ++t) {
 200                 if (isdigit((unsigned char)*t))
 201                         continue;
 202                 if (*t == '.' && dot == NULL) {
 203                         dot = t;
 204                         continue;
 205                 }
 206                 badformat();
 207         }
 208
 209         if ((lt = localtime(&tval)) == NULL)
 210                 err(EXIT_FAILURE, "localtime %lld failed", (long long)tval);
 211
 212         lt->tm_isdst = -1;                      /* Divine correct DST */
 213
 214         if (dot != NULL) {                      /* .ss */
 215                 len = strlen(dot);
 216                 if (len != 3)
 217                         badformat();
 218                 ++dot;
 219                 lt->tm_sec = ATOI2(dot);
 220                 if (lt->tm_sec > 61)
 221                         badvalue("seconds");
 222         } else {
 223                 len = 0;
 224                 lt->tm_sec = 0;
 225         }
 226
 227         yearset = 0;
 228         switch (strlen(p) - len) {
 229         case 12:                                /* cc */
 230                 lt->tm_year = ATOI2(p) * 100 - TM_YEAR_BASE;
 231                 if (lt->tm_year < 0)
 232                         badtime();
 233                 yearset = 1;
 234                 /* FALLTHROUGH */
 235         case 10:                                /* yy */
 236                 if (yearset) {
 237                         lt->tm_year += ATOI2(p);
 238                 } else {
 239                         yearset = ATOI2(p);
 240                         if (yearset < 69)
 241                                 lt->tm_year = yearset + 2000 - TM_YEAR_BASE;
 242                         else
 243                                 lt->tm_year = yearset + 1900 - TM_YEAR_BASE;
 244                 }
 245                 /* FALLTHROUGH */
 246         case 8:                                 /* mm */
 247                 lt->tm_mon = ATOI2(p);
 248                 if (lt->tm_mon > 12 || lt->tm_mon == 0)
 249                         badvalue("month");
 250                 --lt->tm_mon;                   /* time struct is 0 - 11 */
 251                 /* FALLTHROUGH */
 252         case 6:                                 /* dd */
 253                 lt->tm_mday = ATOI2(p);
 254                 switch (lt->tm_mon) {
 255                 case 0:
 256                 case 2:
 257                 case 4:
 258                 case 6:
 259                 case 7:
 260                 case 9:
 261                 case 11:
 262                         if (lt->tm_mday > 31 || lt->tm_mday == 0)
 263                                 badvalue("day of month");
 264                         break;
 265                 case 3:
 266                 case 5:
 267                 case 8:
 268                 case 10:
 269                         if (lt->tm_mday > 30 || lt->tm_mday == 0)
 270                                 badvalue("day of month");
 271                         break;
 272                 case 1:
 273                         if (lt->tm_mday > 29 || lt->tm_mday == 0 ||
 274                             (lt->tm_mday == 29 &&
 275                              !isleap(lt->tm_year + TM_YEAR_BASE)))
 276                                 badvalue("day of month");
 277                         break;
 278                 default:
 279                         badvalue("month");
 280                         break;
 281                 }
 282                 /* FALLTHROUGH */
 283         case 4:                                 /* hh */
 284                 lt->tm_hour = ATOI2(p);
 285                 if (lt->tm_hour > 23)
 286                         badvalue("hour");
 287                 /* FALLTHROUGH */
 288         case 2:                                 /* mm */
 289                 lt->tm_min = ATOI2(p);
 290                 if (lt->tm_min > 59)
 291                         badvalue("minute");
 292                 break;
 293         case 0:                                 /* was just .sss */
 294                 if (len != 0)
 295                         break;
 296                 /* FALLTHROUGH */
 297         default:
 298                 badformat();
 299         }
 300
 301         /* convert broken-down time to UTC clock time */
 302         if ((new_time = mktime(lt)) == -1)
 303                 badtime();
 304
 305         /* if jflag is set, don't actually change the time, just return */
 306         if (jflag) {
 307                 tval = new_time;
 308                 return;
 309         }
 310
 311         /* set the time */
 312         if (nflag || netsettime(new_time)) {
 313                 logwtmp("|", "date", "");
 314 #if HAVE_ADJTIME
 315                 if (aflag) {
 316                         tv.tv_sec = new_time - tval;
 317                         tv.tv_usec = 0;
 318                         if (adjtime(&tv, NULL))
 319                                 err(EXIT_FAILURE, "adjtime");
 320                 }
 321 #else
 322                 if (aflag) {
 323                         err(EXIT_FAILURE, "no adjtime");
 324                 }
 325 #endif
 326                 else {
 327                         tval = new_time;
 328                         tv.tv_sec = tval;
 329                         tv.tv_usec = 0;
 330                         if (settimeofday(&tv, NULL))
 331                                 err(EXIT_FAILURE, "settimeofday");
 332                 }
 333                 logwtmp("{", "date", "");
 334         }
 335
 336         if ((p = getlogin()) == NULL)
 337                 p = "???";
 338         syslog(LOG_AUTH | LOG_NOTICE, "date set by %s", p);
 339 }
 340
 341 static void
 342 usage(void)
 343 {
 344         (void)fprintf(stderr,
 345             "Usage: %s [-ajnu] [-d date] [-r seconds] [+format]",
 346             getprogname());
 347         (void)fprintf(stderr, " [[[[[[CC]yy]mm]dd]HH]MM[.SS]]\n");
 348         exit(EXIT_FAILURE);
 349         /* NOTREACHED */
 350 }