summaryrefslogtreecommitdiffstats
path: root/bin/date/netdate.c
blob: 0f12aae5ddf57e37dd70121728e18ba0b11ac7f3 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
/*-
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. 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.
 *
 *	$Id: netdate.c,v 1.2 1994/09/24 02:54:38 davidg Exp $
 */

#ifndef lint
static char sccsid[] = "@(#)netdate.c	8.1 (Berkeley) 5/31/93";
#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 <stdio.h>
#include <string.h>
#include <unistd.h>

#include "extern.h"

#define	WAITACK		2	/* seconds */
#define	WAITDATEACK	5	/* seconds */

extern int retval;

/*
 * 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, setting retval to 2;
 */
int
netsettime(tval)
	time_t tval;
{
	struct timeval tout;
	struct servent *sp;
	struct tsp msg;
	struct sockaddr_in sin, dest, from;
	fd_set ready;
	long waittime;
	int s, length, port, timed_ack, found, err;
	char hostname[MAXHOSTNAMELEN];

	if ((sp = getservbyname("timed", "udp")) == NULL) {
		warnx("udp/timed: unknown service");
		return (retval = 2);
	}

	dest.sin_port = sp->s_port;
	dest.sin_family = AF_INET;
	dest.sin_addr.s_addr = htonl((u_long)INADDR_ANY);
	s = socket(AF_INET, SOCK_DGRAM, 0);
	if (s < 0) {
		if (errno != EPROTONOSUPPORT)
			warn("timed");
		return (retval = 2);
	}

	memset(&sin, 0, sizeof(sin));
	sin.sin_family = AF_INET;
	for (port = IPPORT_RESERVED - 1; port > IPPORT_RESERVED / 2; port--) {
		sin.sin_port = htons((u_short)port);
		if (bind(s, (struct sockaddr *)&sin, sizeof(sin)) >= 0)
			break;
		if (errno == EADDRINUSE)
			continue;
		if (errno != EADDRNOTAVAIL)
			warn("bind");
		goto bad;
	}
	if (port == IPPORT_RESERVED / 2) {
		warnx("all ports in use");
		goto bad;
	}
	msg.tsp_type = TSP_SETDATE;
	msg.tsp_vers = TSPVERSION;
	if (gethostname(hostname, sizeof(hostname))) {
		warn("gethostname");
		goto bad;
	}
	(void)strncpy(msg.tsp_name, hostname, sizeof(hostname));
	msg.tsp_seq = htons((u_short)0);
	msg.tsp_time.tv_sec = htonl((u_long)tval);
	msg.tsp_time.tv_usec = htonl((u_long)0);
	length = sizeof(struct sockaddr_in);
	if (connect(s, (struct sockaddr *)&dest, length) < 0) {
		warn("connect");
		goto bad;
	}
	if (send(s, (char *)&msg, sizeof(struct tsp), 0) < 0) {
		if (errno != ECONNREFUSED)
			warn("send");
		goto bad;
	}

	timed_ack = -1;
	waittime = WAITACK;
loop:
	tout.tv_sec = waittime;
	tout.tv_usec = 0;

	FD_ZERO(&ready);
	FD_SET(s, &ready);
	found = select(FD_SETSIZE, &ready, (fd_set *)0, (fd_set *)0, &tout);

	length = sizeof(err);
	if (!getsockopt(s,
	    SOL_SOCKET, SO_ERROR, (char *)&err, &length) && err) {
		if (err != ECONNREFUSED)
			warn("send (delayed error)");
		goto bad;
	}

	if (found > 0 && FD_ISSET(s, &ready)) {
		length = sizeof(struct sockaddr_in);
		if (recvfrom(s, &msg, sizeof(struct tsp), 0,
		    (struct sockaddr *)&from, &length) < 0) {
			if (errno != ECONNREFUSED)
				warn("recvfrom");
			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",
			    tsptype[msg.tsp_type]);
			timed_ack = -1;
			break;
		}
	}
	if (timed_ack == -1)
		warnx("can't reach time daemon, time set locally");

bad:
	(void)close(s);
	return (retval = 2);
}
OpenPOWER on IntegriCloud