1 /* $NetBSD: netdate.c,v 1.22 2002/09/21 18:15:57 mycroft 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 1.22 2002/09/21 18:15:57 mycroft 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 <poll.h> 57 #include <stdio.h> 58 #include <string.h> 59 #include <unistd.h> 60 61 #include "extern.h" 62 63 #define WAITACK 2 /* seconds */ 64 #define WAITDATEACK 5 /* seconds */ 65 66 extern int retval; 67 68 /* 69 * Set the date in the machines controlled by timedaemons by communicating the 70 * new date to the local timedaemon. If the timedaemon is in the master state, 71 * it performs the correction on all slaves. If it is in the slave state, it 72 * notifies the master that a correction is needed. 73 * Returns 0 on success. Returns > 0 on failure, setting retval to 2; 74 */ 75 int 76 netsettime(time_t tval) 77 { 78 struct sockaddr_in dest, from, nsin; 79 struct tsp msg; 80 char hostname[MAXHOSTNAMELEN]; 81 struct servent *sp; 82 struct pollfd ready[1]; 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 ready[0].fd = s; 152 ready[0].events = POLLIN; 153 loop: 154 found = poll(ready, 1, waittime * 1000); 155 156 length = sizeof(error); 157 if (!getsockopt(s, 158 SOL_SOCKET, SO_ERROR, (char *)&error, &length) && error) { 159 if (error != ECONNREFUSED) 160 warn("send (delayed error)"); 161 goto bad; 162 } 163 164 if (found > 0 && ready[0].revents & POLLIN) { 165 length = sizeof(struct sockaddr_in); 166 if (recvfrom(s, &msg, sizeof(struct tsp), 0, 167 (struct sockaddr *)&from, &length) < 0) { 168 if (errno != ECONNREFUSED) 169 warn("recvfrom"); 170 goto bad; 171 } 172 msg.tsp_seq = ntohs(msg.tsp_seq); 173 msg.tsp_time.tv_sec = ntohl(msg.tsp_time.tv_sec); 174 msg.tsp_time.tv_usec = ntohl(msg.tsp_time.tv_usec); 175 switch (msg.tsp_type) { 176 case TSP_ACK: 177 timed_ack = TSP_ACK; 178 waittime = WAITDATEACK; 179 goto loop; 180 case TSP_DATEACK: 181 (void)close(s); 182 return (0); 183 default: 184 warnx("wrong ack received from timed: %s", 185 tsptype[msg.tsp_type]); 186 timed_ack = -1; 187 break; 188 } 189 } 190 if (timed_ack == -1) 191 warnx("can't reach time daemon, time set locally"); 192 193 bad: 194 (void)close(s); 195 return (retval = 2); 196 } 197