1 /* $NetBSD: netdate.c,v 1.21 2001/11/03 13:08:16 lukem Exp $ */ 2 3 /*- 4 * Copyright (c) 1990, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 #ifndef lint 38 #if 0 39 static char sccsid[] = "@(#)netdate.c 8.2 (Berkeley) 4/28/95"; 40 #else 41 __RCSID("$NetBSD: netdate.c,v 1.21 2001/11/03 13:08:16 lukem Exp $"); 42 #endif 43 #endif /* not lint */ 44 45 #include <sys/param.h> 46 #include <sys/time.h> 47 #include <sys/socket.h> 48 49 #include <netinet/in.h> 50 #include <netdb.h> 51 #define TSPTYPES 52 #include <protocols/timed.h> 53 54 #include <err.h> 55 #include <errno.h> 56 #include <stdio.h> 57 #include <string.h> 58 #include <unistd.h> 59 60 #include "extern.h" 61 62 #define WAITACK 2 /* seconds */ 63 #define WAITDATEACK 5 /* seconds */ 64 65 extern int retval; 66 67 /* 68 * Set the date in the machines controlled by timedaemons by communicating the 69 * new date to the local timedaemon. If the timedaemon is in the master state, 70 * it performs the correction on all slaves. If it is in the slave state, it 71 * notifies the master that a correction is needed. 72 * Returns 0 on success. Returns > 0 on failure, setting retval to 2; 73 */ 74 int 75 netsettime(time_t tval) 76 { 77 struct sockaddr_in dest, from, nsin; 78 struct timeval tout; 79 struct tsp msg; 80 char hostname[MAXHOSTNAMELEN]; 81 struct servent *sp; 82 fd_set ready; 83 long waittime; 84 int error, found, s, timed_ack; 85 socklen_t length; 86 #ifdef IP_PORTRANGE 87 int on; 88 #endif 89 90 if ((sp = getservbyname("timed", "udp")) == NULL) { 91 warnx("udp/timed: unknown service"); 92 return (retval = 2); 93 } 94 95 (void)memset(&dest, 0, sizeof(dest)); 96 #ifdef BSD4_4 97 dest.sin_len = sizeof(struct sockaddr_in); 98 #endif 99 dest.sin_family = AF_INET; 100 dest.sin_port = sp->s_port; 101 dest.sin_addr.s_addr = htonl(INADDR_ANY); 102 s = socket(AF_INET, SOCK_DGRAM, 0); 103 if (s < 0) { 104 if (errno != EPROTONOSUPPORT) 105 warn("timed"); 106 return (retval = 2); 107 } 108 109 #ifdef IP_PORTRANGE 110 on = IP_PORTRANGE_LOW; 111 if (setsockopt(s, IPPROTO_IP, IP_PORTRANGE, &on, sizeof(on)) < 0) { 112 warn("setsockopt"); 113 goto bad; 114 } 115 #endif 116 117 (void)memset(&nsin, 0, sizeof(nsin)); 118 #ifdef BSD4_4 119 nsin.sin_len = sizeof(struct sockaddr_in); 120 #endif 121 nsin.sin_family = AF_INET; 122 if (bind(s, (struct sockaddr *)&nsin, sizeof(nsin)) < 0) { 123 warn("bind"); 124 goto bad; 125 } 126 127 msg.tsp_type = TSP_SETDATE; 128 msg.tsp_vers = TSPVERSION; 129 if (gethostname(hostname, sizeof(hostname))) { 130 warn("gethostname"); 131 goto bad; 132 } 133 hostname[sizeof(hostname) - 1] = '\0'; 134 (void)strncpy(msg.tsp_name, hostname, sizeof(hostname)); 135 msg.tsp_seq = htons((u_short)0); 136 msg.tsp_time.tv_sec = htonl((u_long)tval); 137 msg.tsp_time.tv_usec = htonl((u_long)0); 138 length = sizeof(struct sockaddr_in); 139 if (connect(s, (struct sockaddr *)&dest, length) < 0) { 140 warn("connect"); 141 goto bad; 142 } 143 if (send(s, (char *)&msg, sizeof(struct tsp), 0) < 0) { 144 if (errno != ECONNREFUSED) 145 warn("send"); 146 goto bad; 147 } 148 149 timed_ack = -1; 150 waittime = WAITACK; 151 loop: 152 tout.tv_sec = waittime; 153 tout.tv_usec = 0; 154 155 FD_ZERO(&ready); 156 FD_SET(s, &ready); 157 found = select(FD_SETSIZE, &ready, (fd_set *)0, (fd_set *)0, &tout); 158 159 length = sizeof(error); 160 if (!getsockopt(s, 161 SOL_SOCKET, SO_ERROR, (char *)&error, &length) && error) { 162 if (error != ECONNREFUSED) 163 warn("send (delayed error)"); 164 goto bad; 165 } 166 167 if (found > 0 && FD_ISSET(s, &ready)) { 168 length = sizeof(struct sockaddr_in); 169 if (recvfrom(s, &msg, sizeof(struct tsp), 0, 170 (struct sockaddr *)&from, &length) < 0) { 171 if (errno != ECONNREFUSED) 172 warn("recvfrom"); 173 goto bad; 174 } 175 msg.tsp_seq = ntohs(msg.tsp_seq); 176 msg.tsp_time.tv_sec = ntohl(msg.tsp_time.tv_sec); 177 msg.tsp_time.tv_usec = ntohl(msg.tsp_time.tv_usec); 178 switch (msg.tsp_type) { 179 case TSP_ACK: 180 timed_ack = TSP_ACK; 181 waittime = WAITDATEACK; 182 goto loop; 183 case TSP_DATEACK: 184 (void)close(s); 185 return (0); 186 default: 187 warnx("wrong ack received from timed: %s", 188 tsptype[msg.tsp_type]); 189 timed_ack = -1; 190 break; 191 } 192 } 193 if (timed_ack == -1) 194 warnx("can't reach time daemon, time set locally"); 195 196 bad: 197 (void)close(s); 198 return (retval = 2); 199 } 200