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a5752d55e0
Submitted by: Garrett Cooper
182 lines
5.1 KiB
C
182 lines
5.1 KiB
C
/*-
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* Copyright (c) 1990, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#if 0
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#ifndef lint
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static char sccsid[] = "@(#)netdate.c 8.1 (Berkeley) 5/31/93";
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#endif /* not lint */
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#endif
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/time.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <netdb.h>
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#define TSPTYPES
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#include <protocols/timed.h>
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#include <err.h>
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#include <errno.h>
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#include <string.h>
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#include <unistd.h>
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#include "extern.h"
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#define WAITACK 2 /* seconds */
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#define WAITDATEACK 5 /* seconds */
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/*
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* Set the date in the machines controlled by timedaemons by communicating the
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* new date to the local timedaemon. If the timedaemon is in the master state,
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* it performs the correction on all slaves. If it is in the slave state, it
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* notifies the master that a correction is needed.
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* Returns 0 on success. Returns > 0 on failure, setting retval to 2;
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*/
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int
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netsettime(time_t tval)
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{
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struct timeval tout;
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struct servent *sp;
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struct tsp msg;
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struct sockaddr_in lsin, dest, from;
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fd_set ready;
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long waittime;
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int s, port, timed_ack, found, lerr;
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socklen_t length;
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char hostname[MAXHOSTNAMELEN];
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if ((sp = getservbyname("timed", "udp")) == NULL) {
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warnx("timed/udp: unknown service");
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return (retval = 2);
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}
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dest.sin_port = sp->s_port;
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dest.sin_family = AF_INET;
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dest.sin_addr.s_addr = htonl((u_long)INADDR_ANY);
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s = socket(AF_INET, SOCK_DGRAM, 0);
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if (s < 0) {
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if (errno != EAFNOSUPPORT)
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warn("timed");
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return (retval = 2);
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}
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memset(&lsin, 0, sizeof(lsin));
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lsin.sin_family = AF_INET;
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for (port = IPPORT_RESERVED - 1; port > IPPORT_RESERVED / 2; port--) {
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lsin.sin_port = htons((u_short)port);
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if (bind(s, (struct sockaddr *)&lsin, sizeof(lsin)) >= 0)
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break;
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if (errno == EADDRINUSE)
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continue;
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if (errno != EADDRNOTAVAIL)
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warn("bind");
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goto bad;
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}
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if (port == IPPORT_RESERVED / 2) {
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warnx("all ports in use");
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goto bad;
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}
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memset(&msg, 0, sizeof(msg));
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msg.tsp_type = TSP_SETDATE;
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msg.tsp_vers = TSPVERSION;
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if (gethostname(hostname, sizeof(hostname))) {
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warn("gethostname");
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goto bad;
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}
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(void)strlcpy(msg.tsp_name, hostname, sizeof(msg.tsp_name));
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msg.tsp_seq = htons((u_short)0);
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msg.tsp_time.tv_sec = htonl((u_long)tval);
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msg.tsp_time.tv_usec = htonl((u_long)0);
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length = sizeof(struct sockaddr_in);
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if (connect(s, (struct sockaddr *)&dest, length) < 0) {
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warn("connect");
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goto bad;
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}
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if (send(s, (char *)&msg, sizeof(struct tsp), 0) < 0) {
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if (errno != ECONNREFUSED)
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warn("send");
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goto bad;
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}
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timed_ack = -1;
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waittime = WAITACK;
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loop:
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tout.tv_sec = waittime;
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tout.tv_usec = 0;
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FD_ZERO(&ready);
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FD_SET(s, &ready);
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found = select(FD_SETSIZE, &ready, (fd_set *)0, (fd_set *)0, &tout);
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length = sizeof(lerr);
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if (!getsockopt(s,
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SOL_SOCKET, SO_ERROR, (char *)&lerr, &length) && lerr) {
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if (lerr != ECONNREFUSED)
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warnc(lerr, "send (delayed error)");
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goto bad;
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}
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if (found > 0 && FD_ISSET(s, &ready)) {
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length = sizeof(struct sockaddr_in);
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if (recvfrom(s, &msg, sizeof(struct tsp), 0,
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(struct sockaddr *)&from, &length) < 0) {
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if (errno != ECONNREFUSED)
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warn("recvfrom");
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goto bad;
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}
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msg.tsp_seq = ntohs(msg.tsp_seq);
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msg.tsp_time.tv_sec = ntohl(msg.tsp_time.tv_sec);
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msg.tsp_time.tv_usec = ntohl(msg.tsp_time.tv_usec);
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switch (msg.tsp_type) {
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case TSP_ACK:
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timed_ack = TSP_ACK;
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waittime = WAITDATEACK;
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goto loop;
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case TSP_DATEACK:
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(void)close(s);
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return (0);
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default:
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warnx("wrong ack received from timed: %s",
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tsptype[msg.tsp_type]);
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timed_ack = -1;
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break;
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}
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}
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if (timed_ack == -1)
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warnx("can't reach time daemon, time set locally");
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bad:
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(void)close(s);
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return (retval = 2);
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}
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