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File: [cvs.NetBSD.org] / src / bin / date / netdate.c (download)

Revision 1.30, Sat Jan 29 02:16:52 2011 UTC (10 years, 10 months ago) by christos
Branch: MAIN
CVS Tags: yamt-pagecache-tag8, yamt-pagecache-base9, yamt-pagecache-base8, yamt-pagecache-base7, yamt-pagecache-base6, yamt-pagecache-base5, yamt-pagecache-base4, yamt-pagecache-base3, yamt-pagecache-base2, yamt-pagecache-base, yamt-pagecache, tls-maxphys-base, tls-maxphys, tls-earlyentropy-base, tls-earlyentropy, riastradh-xf86-video-intel-2-7-1-pre-2-21-15, riastradh-drm2-base3, riastradh-drm2-base2, riastradh-drm2-base1, riastradh-drm2-base, riastradh-drm2, prg-localcount2-base3, prg-localcount2-base2, prg-localcount2-base1, prg-localcount2-base, prg-localcount2, phil-wifi-base, phil-wifi-20200421, phil-wifi-20200411, phil-wifi-20200406, phil-wifi-20191119, phil-wifi-20190609, pgoyette-localcount-base, pgoyette-localcount-20170426, pgoyette-localcount-20170320, pgoyette-localcount-20170107, pgoyette-localcount-20161104, pgoyette-localcount-20160806, pgoyette-localcount-20160726, pgoyette-localcount, pgoyette-compat-merge-20190127, pgoyette-compat-base, pgoyette-compat-20190127, pgoyette-compat-20190118, pgoyette-compat-1226, pgoyette-compat-1126, pgoyette-compat-1020, pgoyette-compat-0930, pgoyette-compat-0906, pgoyette-compat-0728, pgoyette-compat-0625, pgoyette-compat-0521, pgoyette-compat-0502, pgoyette-compat-0422, pgoyette-compat-0415, pgoyette-compat-0407, pgoyette-compat-0330, pgoyette-compat-0322, pgoyette-compat-0315, pgoyette-compat, perseant-stdc-iso10646-base, perseant-stdc-iso10646, netbsd-9-base, netbsd-9-2-RELEASE, netbsd-9-1-RELEASE, netbsd-9-0-RELEASE, netbsd-9-0-RC2, netbsd-9-0-RC1, netbsd-9, netbsd-8-base, netbsd-8-2-RELEASE, netbsd-8-1-RELEASE, netbsd-8-1-RC1, netbsd-8-0-RELEASE, netbsd-8-0-RC2, netbsd-8-0-RC1, netbsd-8, netbsd-7-nhusb-base-20170116, netbsd-7-nhusb-base, netbsd-7-nhusb, netbsd-7-base, netbsd-7-2-RELEASE, netbsd-7-1-RELEASE, netbsd-7-1-RC2, netbsd-7-1-RC1, netbsd-7-1-2-RELEASE, netbsd-7-1-1-RELEASE, netbsd-7-1, netbsd-7-0-RELEASE, netbsd-7-0-RC3, netbsd-7-0-RC2, netbsd-7-0-RC1, netbsd-7-0-2-RELEASE, netbsd-7-0-1-RELEASE, netbsd-7-0, netbsd-7, netbsd-6-base, netbsd-6-1-RELEASE, netbsd-6-1-RC4, netbsd-6-1-RC3, netbsd-6-1-RC2, netbsd-6-1-RC1, netbsd-6-1-5-RELEASE, netbsd-6-1-4-RELEASE, netbsd-6-1-3-RELEASE, netbsd-6-1-2-RELEASE, netbsd-6-1-1-RELEASE, netbsd-6-1, netbsd-6-0-RELEASE, netbsd-6-0-RC2, netbsd-6-0-RC1, netbsd-6-0-6-RELEASE, netbsd-6-0-5-RELEASE, netbsd-6-0-4-RELEASE, netbsd-6-0-3-RELEASE, netbsd-6-0-2-RELEASE, netbsd-6-0-1-RELEASE, netbsd-6-0, netbsd-6, matt-nb8-mediatek-base, matt-nb8-mediatek, matt-nb6-plus-nbase, matt-nb6-plus-base, matt-nb6-plus, localcount-20160914, khorben-n900, is-mlppp-base, is-mlppp, cjep_sun2x-base1, cjep_sun2x-base, cjep_sun2x, cjep_staticlib_x-base1, cjep_staticlib_x-base, cjep_staticlib_x, cherry-xenmp-base, cherry-xenmp, bouyer-socketcan-base1, bouyer-socketcan-base, bouyer-socketcan, bouyer-quota2-nbase, bouyer-quota2-base, agc-symver-base, agc-symver, HEAD
Branch point for: phil-wifi
Changes since 1.29: +28 -27 lines

revert the revert and fix the code properly.

/* $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;
}