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/* $OpenBSD: rdate.c,v 1.24 2009/10/27 23:59:54 deraadt Exp $ */
/* $NetBSD: rdate.c,v 1.4 1996/03/16 12:37:45 pk Exp $ */
/*
* Copyright (c) 1994 Christos Zoulas
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Christos Zoulas.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* rdate.c: Set the date from the specified host
*
* Uses the rfc868 time protocol at socket 37.
* Time is returned as the number of seconds since
* midnight January 1st 1900.
*/
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <stdio.h>
#include <ctype.h>
#include <err.h>
#include <string.h>
#include <unistd.h>
#include <time.h>
/* there are systems without libutil; for portability */
#ifndef NO_UTIL
#include <util.h>
#else
#define logwtmp(a,b,c)
#endif
void rfc868time_client (const char *, int, struct timeval *, struct timeval *, int);
void ntp_client (const char *, int, struct timeval *, struct timeval *, int);
extern char *__progname;
void
usage(void)
{
(void) fprintf(stderr, "usage: %s [-46acnpsv] host\n", __progname);
(void) fprintf(stderr,
" -4: use IPv4 only\n"
" -6: use IPv6 only\n"
" -a: use adjtime instead of instant change\n"
" -c: correct leap second count\n"
" -n: use SNTP instead of RFC868 time protocol\n"
" -p: just print, don't set\n"
" -s: just set, don't print\n"
" -v: verbose output\n");
}
int
main(int argc, char **argv)
{
int pr = 0, silent = 0, ntp = 0, verbose = 0;
int slidetime = 0, corrleaps = 0;
char *hname;
extern int optind;
int c;
int family = PF_UNSPEC;
struct timeval new, adjust;
while ((c = getopt(argc, argv, "46psancv")) != -1)
switch (c) {
case '4':
family = PF_INET;
break;
case '6':
family = PF_INET6;
break;
case 'p':
pr++;
break;
case 's':
silent++;
break;
case 'a':
slidetime++;
break;
case 'n':
ntp++;
break;
case 'c':
corrleaps = 1;
break;
case 'v':
verbose++;
break;
default:
usage();
return 1;
}
if (argc - 1 != optind) {
usage();
return 1;
}
hname = argv[optind];
if (ntp)
ntp_client(hname, family, &new, &adjust, corrleaps);
else
rfc868time_client(hname, family, &new, &adjust, corrleaps);
if (!pr) {
if (!slidetime) {
logwtmp("|", "date", "");
if (settimeofday(&new, NULL) == -1)
err(1, "Could not set time of day");
logwtmp("{", "date", "");
} else {
if (adjtime(&adjust, NULL) == -1)
err(1, "Could not adjust time of day");
}
}
if (!silent) {
struct tm *ltm;
char buf[80];
time_t tim = new.tv_sec;
double adjsec;
ltm = localtime(&tim);
(void) strftime(buf, sizeof buf, "%a %b %e %H:%M:%S %Z %Y\n", ltm);
(void) fputs(buf, stdout);
adjsec = adjust.tv_sec + adjust.tv_usec / 1.0e6;
if (slidetime || verbose) {
if (ntp)
(void) fprintf(stdout,
"%s: adjust local clock by %.6f seconds\n",
__progname, adjsec);
else
(void) fprintf(stdout,
"%s: adjust local clock by %ld seconds\n",
__progname, adjust.tv_sec);
}
}
return 0;
}
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