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/* $OpenBSD: rfc868time.c,v 1.11 2018/08/18 15:25:20 mestre 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 (tcp).
* Time is returned as the number of seconds since
* midnight January 1st 1900.
*/
#include <sys/socket.h>
#include <sys/time.h>
#include <netinet/in.h>
#include <stdio.h>
#include <ctype.h>
#include <err.h>
#include <string.h>
#include <netdb.h>
#include <unistd.h>
#include <time.h>
/* Obviously it is not just for SNTP clients... */
#include "ntpleaps.h"
/* seconds from midnight Jan 1900 - 1970 */
#define DIFFERENCE 2208988800UL
void
rfc868time_client(const char *hostname, int family, struct timeval *new,
struct timeval *adjust, int leapflag);
void
rfc868time_client(const char *hostname, int family, struct timeval *new,
struct timeval *adjust, int leapflag)
{
struct addrinfo hints, *res0, *res;
struct timeval old;
u_int32_t tim; /* RFC 868 states clearly this is an uint32 */
int s;
int error;
u_int64_t td;
memset(&hints, 0, sizeof(hints));
hints.ai_family = family;
hints.ai_socktype = SOCK_STREAM;
error = getaddrinfo(hostname, "time", &hints, &res0);
if (error) {
errx(1, "%s: %s", hostname, gai_strerror(error));
/*NOTREACHED*/
}
if (pledge("stdio inet", NULL) == -1)
err(1, "pledge");
s = -1;
for (res = res0; res; res = res->ai_next) {
s = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
if (s < 0)
continue;
if (connect(s, res->ai_addr, res->ai_addrlen) < 0) {
close(s);
s = -1;
continue;
}
break;
}
if (s < 0)
err(1, "Could not connect socket");
freeaddrinfo(res0);
if (read(s, &tim, sizeof(tim)) != sizeof(tim))
err(1, "Could not read data");
(void) close(s);
tim = ntohl(tim) - DIFFERENCE;
if (gettimeofday(&old, NULL) == -1)
err(1, "Could not get local time of day");
td = SEC_TO_TAI64(old.tv_sec);
if (leapflag)
ntpleaps_sub(&td);
adjust->tv_sec = tim - TAI64_TO_SEC(td);
adjust->tv_usec = 0;
new->tv_sec = old.tv_sec + adjust->tv_sec;
new->tv_usec = 0;
}
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