2 * Copyright (c) 1990, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
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13 * 3. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
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19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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29 * @(#)netdate.c 8.1 (Berkeley) 5/31/93
30 * $FreeBSD: src/bin/date/netdate.c,v 1.18 2004/04/06 20:06:45 markm Exp $
31 * $DragonFly: src/bin/date/netdate.c,v 1.8 2008/11/10 14:56:33 swildner Exp $
34 #include <sys/param.h>
36 #include <sys/socket.h>
38 #include <netinet/in.h>
41 #include <protocols/timed.h>
50 #define WAITACK 2 /* seconds */
51 #define WAITDATEACK 5 /* seconds */
56 * Set the date in the machines controlled by timedaemons by communicating the
57 * new date to the local timedaemon. If the timedaemon is in the master state,
58 * it performs the correction on all slaves. If it is in the slave state, it
59 * notifies the master that a correction is needed.
60 * Returns 0 on success. Returns > 0 on failure, setting retval to 2;
63 netsettime(time_t tval)
68 struct sockaddr_in tmpsin, dest, from;
71 int s, port, timed_ack, found, errn;
73 char hostname[MAXHOSTNAMELEN];
75 if ((sp = getservbyname("timed", "udp")) == NULL) {
76 warnx("timed/udp: unknown service");
80 dest.sin_port = sp->s_port;
81 dest.sin_family = AF_INET;
82 dest.sin_addr.s_addr = htonl((u_long)INADDR_ANY);
83 s = socket(AF_INET, SOCK_DGRAM, 0);
85 if (errno != EPROTONOSUPPORT)
90 memset(&tmpsin, 0, sizeof(tmpsin));
91 tmpsin.sin_family = AF_INET;
92 for (port = IPPORT_RESERVED - 1; port > IPPORT_RESERVED / 2; port--) {
93 tmpsin.sin_port = htons((u_short)port);
94 if (bind(s, (struct sockaddr *)&tmpsin, sizeof(tmpsin)) >= 0)
96 if (errno == EADDRINUSE)
98 if (errno != EADDRNOTAVAIL)
102 if (port == IPPORT_RESERVED / 2) {
103 warnx("all ports in use");
106 msg.tsp_type = TSP_SETDATE;
107 msg.tsp_vers = TSPVERSION;
108 if (gethostname(hostname, sizeof(hostname))) {
112 strncpy(msg.tsp_name, hostname, sizeof(msg.tsp_name) - 1);
113 msg.tsp_name[sizeof(msg.tsp_name) - 1] = '\0';
114 msg.tsp_seq = htons((u_short)0);
115 msg.tsp_time.tv_sec = htonl((u_long)tval);
116 msg.tsp_time.tv_usec = htonl((u_long)0);
117 length = sizeof(struct sockaddr_in);
118 if (connect(s, (struct sockaddr *)&dest, length) < 0) {
122 if (send(s, (char *)&msg, sizeof(struct tsp), 0) < 0) {
123 if (errno != ECONNREFUSED)
131 tout.tv_sec = waittime;
136 found = select(FD_SETSIZE, &ready, NULL, NULL, &tout);
138 length = sizeof(errn);
140 SOL_SOCKET, SO_ERROR, (char *)&errn, &length) && errn) {
141 if (errn != ECONNREFUSED)
142 warnc(errn, "send (delayed error)");
146 if (found > 0 && FD_ISSET(s, &ready)) {
147 length = sizeof(struct sockaddr_in);
148 if (recvfrom(s, &msg, sizeof(struct tsp), 0,
149 (struct sockaddr *)&from, &length) < 0) {
150 if (errno != ECONNREFUSED)
154 msg.tsp_seq = ntohs(msg.tsp_seq);
155 msg.tsp_time.tv_sec = ntohl(msg.tsp_time.tv_sec);
156 msg.tsp_time.tv_usec = ntohl(msg.tsp_time.tv_usec);
157 switch (msg.tsp_type) {
160 waittime = WAITDATEACK;
166 warnx("wrong ack received from timed: %s",
167 tsptype[msg.tsp_type]);
173 warnx("can't reach time daemon, time set locally");