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 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #ifndef lint 35 /*static char sccsid[] = "from: @(#)netdate.c 8.1 (Berkeley) 5/31/93";*/ 36 static char *rcsid = "$Id: netdate.c,v 1.7 1994/09/22 09:24:52 mycroft Exp $"; 37 #endif /* not lint */ 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 <stdio.h> 51 #include <string.h> 52 #include <unistd.h> 53 54 #include "extern.h" 55 56 #define WAITACK 2 /* seconds */ 57 #define WAITDATEACK 5 /* seconds */ 58 59 extern int retval; 60 61 /* 62 * Set the date in the machines controlled by timedaemons by communicating the 63 * new date to the local timedaemon. If the timedaemon is in the master state, 64 * it performs the correction on all slaves. If it is in the slave state, it 65 * notifies the master that a correction is needed. 66 * Returns 0 on success. Returns > 0 on failure, setting retval to 2; 67 */ 68 int 69 netsettime(tval) 70 time_t tval; 71 { 72 struct timeval tout; 73 struct servent *sp; 74 struct tsp msg; 75 struct sockaddr_in sin, dest, from; 76 fd_set ready; 77 long waittime; 78 int s, length, port, timed_ack, found, err; 79 char hostname[MAXHOSTNAMELEN]; 80 81 if ((sp = getservbyname("timed", "udp")) == NULL) { 82 warnx("udp/timed: unknown service"); 83 return (retval = 2); 84 } 85 86 memset(&dest, 0, sizeof(dest)); 87 dest.sin_port = sp->s_port; 88 dest.sin_family = AF_INET; 89 dest.sin_addr.s_addr = htonl((u_long)INADDR_ANY); 90 s = socket(AF_INET, SOCK_DGRAM, 0); 91 if (s < 0) { 92 if (errno != EPROTONOSUPPORT) 93 warn("timed"); 94 return (retval = 2); 95 } 96 97 memset(&sin, 0, sizeof(sin)); 98 sin.sin_family = AF_INET; 99 for (port = IPPORT_RESERVED - 1; port > IPPORT_RESERVED / 2; port--) { 100 sin.sin_port = htons((u_short)port); 101 if (bind(s, (struct sockaddr *)&sin, sizeof(sin)) >= 0) 102 break; 103 if (errno == EADDRINUSE) 104 continue; 105 if (errno != EADDRNOTAVAIL) 106 warn("bind"); 107 goto bad; 108 } 109 if (port == IPPORT_RESERVED / 2) { 110 warnx("all ports in use"); 111 goto bad; 112 } 113 msg.tsp_type = TSP_SETDATE; 114 msg.tsp_vers = TSPVERSION; 115 if (gethostname(hostname, sizeof(hostname))) { 116 warn("gethostname"); 117 goto bad; 118 } 119 (void)strncpy(msg.tsp_name, hostname, sizeof(hostname)); 120 msg.tsp_seq = htons((u_short)0); 121 msg.tsp_time.tv_sec = htonl((u_long)tval); 122 msg.tsp_time.tv_usec = htonl((u_long)0); 123 length = sizeof(struct sockaddr_in); 124 if (connect(s, (struct sockaddr *)&dest, length) < 0) { 125 warn("connect"); 126 goto bad; 127 } 128 if (send(s, (char *)&msg, sizeof(struct tsp), 0) < 0) { 129 if (errno != ECONNREFUSED) 130 warn("send"); 131 goto bad; 132 } 133 134 timed_ack = -1; 135 waittime = WAITACK; 136 loop: 137 tout.tv_sec = waittime; 138 tout.tv_usec = 0; 139 140 FD_ZERO(&ready); 141 FD_SET(s, &ready); 142 found = select(FD_SETSIZE, &ready, (fd_set *)0, (fd_set *)0, &tout); 143 144 length = sizeof(err); 145 if (!getsockopt(s, 146 SOL_SOCKET, SO_ERROR, (char *)&err, &length) && err) { 147 if (err != ECONNREFUSED) 148 warn("send (delayed error)"); 149 goto bad; 150 } 151 152 if (found > 0 && FD_ISSET(s, &ready)) { 153 length = sizeof(struct sockaddr_in); 154 if (recvfrom(s, &msg, sizeof(struct tsp), 0, 155 (struct sockaddr *)&from, &length) < 0) { 156 if (errno != ECONNREFUSED) 157 warn("recvfrom"); 158 goto bad; 159 } 160 msg.tsp_seq = ntohs(msg.tsp_seq); 161 msg.tsp_time.tv_sec = ntohl(msg.tsp_time.tv_sec); 162 msg.tsp_time.tv_usec = ntohl(msg.tsp_time.tv_usec); 163 switch (msg.tsp_type) { 164 case TSP_ACK: 165 timed_ack = TSP_ACK; 166 waittime = WAITDATEACK; 167 goto loop; 168 case TSP_DATEACK: 169 (void)close(s); 170 return (0); 171 default: 172 warnx("wrong ack received from timed: %s", 173 tsptype[msg.tsp_type]); 174 timed_ack = -1; 175 break; 176 } 177 } 178 if (timed_ack == -1) 179 warnx("can't reach time daemon, time set locally"); 180 181 bad: 182 (void)close(s); 183 return (retval = 2); 184 } 185