usr.sbin/rdate/rdate.c

   1 /*      $OpenBSD: src/usr.sbin/rdate/rdate.c,v 1.22 2004/02/18 20:10:53 jmc Exp $       */
   2 /*      $NetBSD: rdate.c,v 1.4 1996/03/16 12:37:45 pk Exp $     */
   3 /*      $DragonFly: src/usr.sbin/rdate/rdate.c,v 1.2 2005/03/28 02:39:57 dillon Exp $ */
   4
   5 /*
   6  * Copyright (c) 1994 Christos Zoulas
   7  * All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  * 3. All advertising materials mentioning features or use of this software
  18  *    must display the following acknowledgement:
  19  *      This product includes software developed by Christos Zoulas.
  20  * 4. The name of the author may not be used to endorse or promote products
  21  *    derived from this software without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  24  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  25  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  26  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  27  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  28  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  29  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  30  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  31  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  32  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  33  */
  34
  35 /*
  36  * rdate.c: Set the date from the specified host
  37  *
  38  *      Uses the rfc868 time protocol at socket 37.
  39  *      Time is returned as the number of seconds since
  40  *      midnight January 1st 1900.
  41  */
  42
  43 #include <sys/param.h>
  44 #include <sys/socket.h>
  45 #include <sys/time.h>
  46
  47 #include <ctype.h>
  48 #include <err.h>
  49 #include <libutil.h>
  50 #include <stdio.h>
  51 #include <stdlib.h>
  52 #include <string.h>
  53 #include <time.h>
  54 #include <unistd.h>
  55
  56 #include "rdate.h"
  57
  58 static void     usage(void);
  59
  60 int
  61 main(int argc, char **argv)
  62 {
  63         struct timeval new, adjust;
  64         int pr = 0, silent = 0, ntp = 0, verbose = 0;
  65         int slidetime = 0, corrleaps = 0;
  66         const char *hname;
  67         int c;
  68         int family = PF_UNSPEC;
  69
  70         while ((c = getopt(argc, argv, "46psancv")) != -1) {
  71                 switch (c) {
  72                 case '4':
  73                         family = PF_INET;
  74                         break;
  75
  76                 case '6':
  77                         family = PF_INET6;
  78                         break;
  79
  80                 case 'p':
  81                         pr++;
  82                         break;
  83
  84                 case 's':
  85                         silent++;
  86                         break;
  87
  88                 case 'a':
  89                         slidetime++;
  90                         break;
  91
  92                 case 'n':
  93                         ntp++;
  94                         break;
  95
  96                 case 'c':
  97                         corrleaps = 1;
  98                         break;
  99
 100                 case 'v':
 101                         verbose++;
 102                         break;
 103
 104                 default:
 105                         usage();
 106                         return 1;
 107                 }
 108         }
 109         argc -= optind;
 110         argv += optind;
 111
 112         if (argc != 1)
 113                 usage();
 114
 115         hname = *argv;
 116
 117         if (ntp)
 118                 ntp_client(hname, family, &new, &adjust, corrleaps);
 119         else
 120                 rfc868time_client(hname, family, &new, &adjust, corrleaps);
 121
 122         if (!pr) {
 123                 if (!slidetime) {
 124                         logwtmp("|", "date", "");
 125                         if (settimeofday(&new, NULL) == -1)
 126                                 err(1, "Could not set time of day");
 127                         logwtmp("{", "date", "");
 128                 } else {
 129                         if (adjtime(&adjust, NULL) == -1)
 130                                 err(1, "Could not adjust time of day");
 131                 }
 132         }
 133
 134         if (!silent) {
 135                 struct tm *ltm;
 136                 char buf[80];
 137                 time_t tim = new.tv_sec;
 138                 double adjsec;
 139
 140                 ltm = localtime(&tim);
 141                 strftime(buf, sizeof buf, "%a %b %e %H:%M:%S %Z %Y\n", ltm);
 142                 fputs(buf, stdout);
 143
 144                 adjsec  = adjust.tv_sec + adjust.tv_usec / 1.0e6;
 145
 146                 if (ntp) {
 147                         fprintf(stdout,
 148                            "%s: adjust local clock by %.6f seconds\n",
 149                            getprogname(), adjsec);
 150                 } else {
 151                         fprintf(stdout,
 152                            "%s: adjust local clock by %ld seconds\n",
 153                            getprogname(), adjust.tv_sec);
 154                 }
 155         }
 156
 157         return(EXIT_SUCCESS);
 158 }
 159
 160 static void
 161 usage(void)
 162 {
 163         fprintf(stderr, "Usage: %s [-46acnpsv] host\n", getprogname());
 164         fprintf(stderr, "  -4: use IPv4 only\n");
 165         fprintf(stderr, "  -6: use IPv6 only\n");
 166         fprintf(stderr, "  -a: use adjtime instead of instant change\n");
 167         fprintf(stderr, "  -c: correct leap second count\n");
 168         fprintf(stderr, "  -n: use SNTP instead of RFC868 time protocol\n");
 169         fprintf(stderr, "  -p: just print, don't set\n");
 170         fprintf(stderr, "  -s: just set, don't print\n");
 171         fprintf(stderr, "  -v: verbose output\n");
 172         exit(EXIT_FAILURE);
 173 }