1 /* $NetBSD: netdate.c,v 1.24 2003/08/07 09:05:09 agc 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. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 #ifndef lint 34 #if 0 35 static char sccsid[] = "@(#)netdate.c 8.2 (Berkeley) 4/28/95"; 36 #else 37 __RCSID("$NetBSD: netdate.c,v 1.24 2003/08/07 09:05:09 agc Exp $"); 38 #endif 39 #endif /* not lint */ 40 41 #include <sys/param.h> 42 #include <sys/time.h> 43 #include <sys/socket.h> 44 45 #include <netinet/in.h> 46 #include <netdb.h> 47 #define TSPTYPES 48 #include <protocols/timed.h> 49 50 #include <err.h> 51 #include <errno.h> 52 #include <poll.h> 53 #include <stdio.h> 54 #include <string.h> 55 #include <unistd.h> 56 57 #include "extern.h" 58 59 #define WAITACK 2 /* seconds */ 60 #define WAITDATEACK 5 /* seconds */ 61 62 extern int retval; 63 64 /* 65 * Set the date in the machines controlled by timedaemons by communicating the 66 * new date to the local timedaemon. If the timedaemon is in the master state, 67 * it performs the correction on all slaves. If it is in the slave state, it 68 * notifies the master that a correction is needed. 69 * Returns 0 on success. Returns > 0 on failure, setting retval to 2; 70 */ 71 int 72 netsettime(time_t tval) 73 { 74 struct sockaddr_in dest, from, nsin; 75 struct tsp msg; 76 char hostname[MAXHOSTNAMELEN]; 77 struct servent *sp; 78 struct pollfd ready[1]; 79 long waittime; 80 int error, found, s, timed_ack; 81 socklen_t length; 82 #ifdef IP_PORTRANGE 83 int on; 84 #endif 85 86 if ((sp = getservbyname("timed", "udp")) == NULL) { 87 warnx("udp/timed: unknown service"); 88 return (retval = 2); 89 } 90 91 (void)memset(&dest, 0, sizeof(dest)); 92 #ifdef BSD4_4 93 dest.sin_len = sizeof(struct sockaddr_in); 94 #endif 95 dest.sin_family = AF_INET; 96 dest.sin_port = sp->s_port; 97 dest.sin_addr.s_addr = htonl(INADDR_ANY); 98 s = socket(AF_INET, SOCK_DGRAM, 0); 99 if (s < 0) { 100 if (errno != EPROTONOSUPPORT) 101 warn("timed"); 102 return (retval = 2); 103 } 104 105 #ifdef IP_PORTRANGE 106 on = IP_PORTRANGE_LOW; 107 if (setsockopt(s, IPPROTO_IP, IP_PORTRANGE, &on, sizeof(on)) < 0) { 108 warn("setsockopt"); 109 goto bad; 110 } 111 #endif 112 113 (void)memset(&nsin, 0, sizeof(nsin)); 114 #ifdef BSD4_4 115 nsin.sin_len = sizeof(struct sockaddr_in); 116 #endif 117 nsin.sin_family = AF_INET; 118 if (bind(s, (struct sockaddr *)&nsin, sizeof(nsin)) < 0) { 119 warn("bind"); 120 goto bad; 121 } 122 123 msg.tsp_type = TSP_SETDATE; 124 msg.tsp_vers = TSPVERSION; 125 if (gethostname(hostname, sizeof(hostname))) { 126 warn("gethostname"); 127 goto bad; 128 } 129 hostname[sizeof(hostname) - 1] = '\0'; 130 (void)strlcpy(msg.tsp_name, hostname, sizeof(msg.tsp_name)); 131 msg.tsp_seq = htons((u_short)0); 132 msg.tsp_time.tv_sec = htonl((u_long)tval); 133 msg.tsp_time.tv_usec = htonl((u_long)0); 134 length = sizeof(struct sockaddr_in); 135 if (connect(s, (struct sockaddr *)&dest, length) < 0) { 136 warn("connect"); 137 goto bad; 138 } 139 if (send(s, (char *)&msg, sizeof(struct tsp), 0) < 0) { 140 if (errno != ECONNREFUSED) 141 warn("send"); 142 goto bad; 143 } 144 145 timed_ack = -1; 146 waittime = WAITACK; 147 ready[0].fd = s; 148 ready[0].events = POLLIN; 149 loop: 150 found = poll(ready, 1, waittime * 1000); 151 152 length = sizeof(error); 153 if (!getsockopt(s, 154 SOL_SOCKET, SO_ERROR, (char *)&error, &length) && error) { 155 if (error != ECONNREFUSED) 156 warn("send (delayed error)"); 157 goto bad; 158 } 159 160 if (found > 0 && ready[0].revents & POLLIN) { 161 length = sizeof(struct sockaddr_in); 162 if (recvfrom(s, &msg, sizeof(struct tsp), 0, 163 (struct sockaddr *)&from, &length) < 0) { 164 if (errno != ECONNREFUSED) 165 warn("recvfrom"); 166 goto bad; 167 } 168 msg.tsp_seq = ntohs(msg.tsp_seq); 169 msg.tsp_time.tv_sec = ntohl(msg.tsp_time.tv_sec); 170 msg.tsp_time.tv_usec = ntohl(msg.tsp_time.tv_usec); 171 switch (msg.tsp_type) { 172 case TSP_ACK: 173 timed_ack = TSP_ACK; 174 waittime = WAITDATEACK; 175 goto loop; 176 case TSP_DATEACK: 177 (void)close(s); 178 return (0); 179 default: 180 warnx("wrong ack received from timed: %s", 181 tsptype[msg.tsp_type]); 182 timed_ack = -1; 183 break; 184 } 185 } 186 if (timed_ack == -1) 187 warnx("can't reach time daemon, time set locally"); 188 189 bad: 190 (void)close(s); 191 return (retval = 2); 192 } 193