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 * 4. 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. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30#if 0 31#ifndef lint 32static char sccsid[] = "@(#)netdate.c 8.1 (Berkeley) 5/31/93"; 33#endif /* not lint */ 34#endif 35 36#include <sys/cdefs.h> 37__FBSDID("$FreeBSD: releng/10.3/bin/date/netdate.c 244538 2012-12-21 15:54:13Z kevlo $"); 38 39#include <sys/param.h> 40#include <sys/time.h> 41#include <sys/socket.h> 42 43#include <netinet/in.h> 44#include <netdb.h> 45#define TSPTYPES 46#include <protocols/timed.h> 47 48#include <err.h> 49#include <errno.h> 50#include <string.h> 51#include <unistd.h> 52 53#include "extern.h" 54 55#define WAITACK 2 /* seconds */ 56#define WAITDATEACK 5 /* seconds */ 57 58/* 59 * Set the date in the machines controlled by timedaemons by communicating the 60 * new date to the local timedaemon. If the timedaemon is in the master state, 61 * it performs the correction on all slaves. If it is in the slave state, it 62 * notifies the master that a correction is needed. 63 * Returns 0 on success. Returns > 0 on failure, setting retval to 2; 64 */ 65int 66netsettime(time_t tval) 67{ 68 struct timeval tout; 69 struct servent *sp; 70 struct tsp msg; 71 struct sockaddr_in lsin, dest, from; 72 fd_set ready; 73 long waittime; 74 int s, port, timed_ack, found, lerr; 75 socklen_t length; 76 char hostname[MAXHOSTNAMELEN]; 77 78 if ((sp = getservbyname("timed", "udp")) == NULL) { 79 warnx("timed/udp: unknown service"); 80 return (retval = 2); 81 } 82 83 dest.sin_port = sp->s_port; 84 dest.sin_family = AF_INET; 85 dest.sin_addr.s_addr = htonl((u_long)INADDR_ANY); 86 s = socket(AF_INET, SOCK_DGRAM, 0); 87 if (s < 0) { 88 if (errno != EAFNOSUPPORT) 89 warn("timed"); 90 return (retval = 2); 91 } 92 93 memset(&lsin, 0, sizeof(lsin)); 94 lsin.sin_family = AF_INET; 95 for (port = IPPORT_RESERVED - 1; port > IPPORT_RESERVED / 2; port--) { 96 lsin.sin_port = htons((u_short)port); 97 if (bind(s, (struct sockaddr *)&lsin, sizeof(lsin)) >= 0) 98 break; 99 if (errno == EADDRINUSE) 100 continue; 101 if (errno != EADDRNOTAVAIL) 102 warn("bind"); 103 goto bad; 104 } 105 if (port == IPPORT_RESERVED / 2) { 106 warnx("all ports in use"); 107 goto bad; 108 } 109 memset(&msg, 0, sizeof(msg)); 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)strlcpy(msg.tsp_name, hostname, sizeof(msg.tsp_name)); 117 msg.tsp_seq = htons((u_short)0); 118 msg.tsp_time.tv_sec = htonl((u_long)tval); 119 msg.tsp_time.tv_usec = htonl((u_long)0); 120 length = sizeof(struct sockaddr_in); 121 if (connect(s, (struct sockaddr *)&dest, length) < 0) { 122 warn("connect"); 123 goto bad; 124 } 125 if (send(s, (char *)&msg, sizeof(struct tsp), 0) < 0) { 126 if (errno != ECONNREFUSED) 127 warn("send"); 128 goto bad; 129 } 130 131 timed_ack = -1; 132 waittime = WAITACK; 133loop: 134 tout.tv_sec = waittime; 135 tout.tv_usec = 0; 136 137 FD_ZERO(&ready); 138 FD_SET(s, &ready); 139 found = select(FD_SETSIZE, &ready, (fd_set *)0, (fd_set *)0, &tout); 140 141 length = sizeof(lerr); 142 if (!getsockopt(s, 143 SOL_SOCKET, SO_ERROR, (char *)&lerr, &length) && lerr) { 144 if (lerr != ECONNREFUSED) 145 warnc(lerr, "send (delayed error)"); 146 goto bad; 147 } 148 149 if (found > 0 && FD_ISSET(s, &ready)) { 150 length = sizeof(struct sockaddr_in); 151 if (recvfrom(s, &msg, sizeof(struct tsp), 0, 152 (struct sockaddr *)&from, &length) < 0) { 153 if (errno != ECONNREFUSED) 154 warn("recvfrom"); 155 goto bad; 156 } 157 msg.tsp_seq = ntohs(msg.tsp_seq); 158 msg.tsp_time.tv_sec = ntohl(msg.tsp_time.tv_sec); 159 msg.tsp_time.tv_usec = ntohl(msg.tsp_time.tv_usec); 160 switch (msg.tsp_type) { 161 case TSP_ACK: 162 timed_ack = TSP_ACK; 163 waittime = WAITDATEACK; 164 goto loop; 165 case TSP_DATEACK: 166 (void)close(s); 167 return (0); 168 default: 169 warnx("wrong ack received from timed: %s", 170 tsptype[msg.tsp_type]); 171 timed_ack = -1; 172 break; 173 } 174 } 175 if (timed_ack == -1) 176 warnx("can't reach time daemon, time set locally"); 177 178bad: 179 (void)close(s); 180 return (retval = 2); 181} 182