Add the DragonFly cvs id and perform general cleanups on cvs/rcs/sccs ids. Most
[dragonfly.git] / bin / date / netdate.c
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1/*-
2 * Copyright (c) 1990, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
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32 *
33 * @(#)netdate.c 8.1 (Berkeley) 5/31/93
34 * $FreeBSD: src/bin/date/netdate.c,v 1.11.2.1 2001/05/12 17:14:22 fenner Exp $
35 * $DragonFly: src/bin/date/netdate.c,v 1.2 2003/06/17 04:22:49 dillon Exp $
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36 */
37
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38#include <sys/param.h>
39#include <sys/time.h>
40#include <sys/socket.h>
41
42#include <netinet/in.h>
43#include <netdb.h>
44#define TSPTYPES
45#include <protocols/timed.h>
46
47#include <err.h>
48#include <errno.h>
49#include <string.h>
50#include <unistd.h>
51
52#include "extern.h"
53
54#define WAITACK 2 /* seconds */
55#define WAITDATEACK 5 /* seconds */
56
57extern int retval;
58
59/*
60 * Set the date in the machines controlled by timedaemons by communicating the
61 * new date to the local timedaemon. If the timedaemon is in the master state,
62 * it performs the correction on all slaves. If it is in the slave state, it
63 * notifies the master that a correction is needed.
64 * Returns 0 on success. Returns > 0 on failure, setting retval to 2;
65 */
66int
67netsettime(tval)
68 time_t tval;
69{
70 struct timeval tout;
71 struct servent *sp;
72 struct tsp msg;
73 struct sockaddr_in sin, dest, from;
74 fd_set ready;
75 long waittime;
76 int s, length, port, timed_ack, found, err;
77 char hostname[MAXHOSTNAMELEN];
78
79 if ((sp = getservbyname("timed", "udp")) == NULL) {
80 warnx("udp/timed: unknown service");
81 return (retval = 2);
82 }
83
84 dest.sin_port = sp->s_port;
85 dest.sin_family = AF_INET;
86 dest.sin_addr.s_addr = htonl((u_long)INADDR_ANY);
87 s = socket(AF_INET, SOCK_DGRAM, 0);
88 if (s < 0) {
89 if (errno != EPROTONOSUPPORT)
90 warn("timed");
91 return (retval = 2);
92 }
93
94 memset(&sin, 0, sizeof(sin));
95 sin.sin_family = AF_INET;
96 for (port = IPPORT_RESERVED - 1; port > IPPORT_RESERVED / 2; port--) {
97 sin.sin_port = htons((u_short)port);
98 if (bind(s, (struct sockaddr *)&sin, sizeof(sin)) >= 0)
99 break;
100 if (errno == EADDRINUSE)
101 continue;
102 if (errno != EADDRNOTAVAIL)
103 warn("bind");
104 goto bad;
105 }
106 if (port == IPPORT_RESERVED / 2) {
107 warnx("all ports in use");
108 goto bad;
109 }
110 msg.tsp_type = TSP_SETDATE;
111 msg.tsp_vers = TSPVERSION;
112 if (gethostname(hostname, sizeof(hostname))) {
113 warn("gethostname");
114 goto bad;
115 }
116 (void)strncpy(msg.tsp_name, hostname, sizeof(msg.tsp_name) - 1);
117 msg.tsp_name[sizeof(msg.tsp_name) - 1] = '\0';
118 msg.tsp_seq = htons((u_short)0);
119 msg.tsp_time.tv_sec = htonl((u_long)tval);
120 msg.tsp_time.tv_usec = htonl((u_long)0);
121 length = sizeof(struct sockaddr_in);
122 if (connect(s, (struct sockaddr *)&dest, length) < 0) {
123 warn("connect");
124 goto bad;
125 }
126 if (send(s, (char *)&msg, sizeof(struct tsp), 0) < 0) {
127 if (errno != ECONNREFUSED)
128 warn("send");
129 goto bad;
130 }
131
132 timed_ack = -1;
133 waittime = WAITACK;
134loop:
135 tout.tv_sec = waittime;
136 tout.tv_usec = 0;
137
138 FD_ZERO(&ready);
139 FD_SET(s, &ready);
140 found = select(FD_SETSIZE, &ready, (fd_set *)0, (fd_set *)0, &tout);
141
142 length = sizeof(err);
143 if (!getsockopt(s,
144 SOL_SOCKET, SO_ERROR, (char *)&err, &length) && err) {
145 if (err != ECONNREFUSED)
146 warnc(err, "send (delayed error)");
147 goto bad;
148 }
149
150 if (found > 0 && FD_ISSET(s, &ready)) {
151 length = sizeof(struct sockaddr_in);
152 if (recvfrom(s, &msg, sizeof(struct tsp), 0,
153 (struct sockaddr *)&from, &length) < 0) {
154 if (errno != ECONNREFUSED)
155 warn("recvfrom");
156 goto bad;
157 }
158 msg.tsp_seq = ntohs(msg.tsp_seq);
159 msg.tsp_time.tv_sec = ntohl(msg.tsp_time.tv_sec);
160 msg.tsp_time.tv_usec = ntohl(msg.tsp_time.tv_usec);
161 switch (msg.tsp_type) {
162 case TSP_ACK:
163 timed_ack = TSP_ACK;
164 waittime = WAITDATEACK;
165 goto loop;
166 case TSP_DATEACK:
167 (void)close(s);
168 return (0);
169 default:
170 warnx("wrong ack received from timed: %s",
171 tsptype[msg.tsp_type]);
172 timed_ack = -1;
173 break;
174 }
175 }
176 if (timed_ack == -1)
177 warnx("can't reach time daemon, time set locally");
178
179bad:
180 (void)close(s);
181 return (retval = 2);
182}