/* $NetBSD: netdate.c,v 1.30 2011/01/29 02:16:52 christos Exp $ */
/*-
* Copyright (c) 1990, 1993
* The Regents of the University of California. 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. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
*/
#include <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "@(#)netdate.c 8.2 (Berkeley) 4/28/95";
#else
__RCSID("$NetBSD: netdate.c,v 1.30 2011/01/29 02:16:52 christos Exp $");
#endif
#endif /* not lint */
#include <sys/param.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#define TSPTYPES
#include <protocols/timed.h>
#include <err.h>
#include <errno.h>
#include <poll.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include "extern.h"
#define WAITACK 2000 /* milliseconds */
#define WAITDATEACK 5000 /* milliseconds */
static const char *
tsp_type_to_string(const struct tsp *msg)
{
unsigned i;
i = msg->tsp_type;
return i < TSPTYPENUMBER ? tsptype[i] : "unknown";
}
/*
* Set the date in the machines controlled by timedaemons by communicating the
* new date to the local timedaemon. If the timedaemon is in the master state,
* it performs the correction on all slaves. If it is in the slave state, it
* notifies the master that a correction is needed.
* Returns 0 on success. Returns > 0 on failure.
*/
int
netsettime(time_t tval)
{
struct sockaddr_in dest;
struct tsp msg;
char hostname[MAXHOSTNAMELEN];
struct servent *sp;
struct pollfd ready;
int found, s, timed_ack, waittime;
if ((sp = getservbyname("timed", "udp")) == NULL) {
warnx("udp/timed: unknown service");
return 2;
}
(void)memset(&dest, 0, sizeof(dest));
#ifdef BSD4_4
dest.sin_len = sizeof(dest);
#endif
dest.sin_family = AF_INET;
dest.sin_port = sp->s_port;
dest.sin_addr.s_addr = htonl(INADDR_ANY);
s = socket(AF_INET, SOCK_DGRAM, 0);
if (s == -1) {
if (errno != EAFNOSUPPORT)
warn("timed");
return 2;
}
#ifdef IP_PORTRANGE
{
static const int on = IP_PORTRANGE_LOW;
if (setsockopt(s, IPPROTO_IP, IP_PORTRANGE, &on,
sizeof(on)) == -1) {
warn("setsockopt");
goto bad;
}
}
#endif
msg.tsp_type = TSP_SETDATE;
msg.tsp_vers = TSPVERSION;
if (gethostname(hostname, sizeof(hostname)) == -1) {
warn("gethostname");
goto bad;
}
(void)strlcpy(msg.tsp_name, hostname, sizeof(msg.tsp_name));
msg.tsp_seq = htons((in_port_t)0);
msg.tsp_time.tv_sec = htonl((in_addr_t)tval); /* XXX: y2038 */
msg.tsp_time.tv_usec = htonl((in_addr_t)0);
if (connect(s, (const void *)&dest, sizeof(dest)) == -1) {
warn("connect");
goto bad;
}
if (send(s, &msg, sizeof(msg), 0) == -1) {
if (errno != ECONNREFUSED)
warn("send");
goto bad;
}
timed_ack = -1;
waittime = WAITACK;
ready.fd = s;
ready.events = POLLIN;
loop:
found = poll(&ready, 1, waittime);
{
socklen_t len;
int error;
len = sizeof(error);
if (getsockopt(s, SOL_SOCKET, SO_ERROR, &error, &len) == -1) {
warn("getsockopt");
goto bad;
}
if (error) {
if (error != ECONNREFUSED) {
errno = error;
warn("send (delayed error)");
}
goto bad;
}
}
if (found > 0 && ready.revents & POLLIN) {
ssize_t ret;
if ((ret = recv(s, &msg, sizeof(msg), 0)) == -1) {
if (errno != ECONNREFUSED)
warn("recv");
goto bad;
} else if ((size_t)ret < sizeof(msg)) {
warnx("recv: incomplete packet");
goto bad;
}
msg.tsp_seq = ntohs(msg.tsp_seq);
msg.tsp_time.tv_sec = ntohl(msg.tsp_time.tv_sec);
msg.tsp_time.tv_usec = ntohl(msg.tsp_time.tv_usec);
switch (msg.tsp_type) {
case TSP_ACK:
timed_ack = TSP_ACK;
waittime = WAITDATEACK;
goto loop;
case TSP_DATEACK:
(void)close(s);
return 0;
default:
warnx("wrong ack received from timed: %s",
tsp_type_to_string(&msg));
timed_ack = -1;
break;
}
}
if (timed_ack == -1)
warnx("can't reach time daemon, time set locally");
bad:
(void)close(s);
return 2;
}
