1 /*- 2 * Copyright (c) 1990 The Regents of the University of California. 3 * 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 5.2 (Berkeley) 2/25/91";*/ 36 static char rcsid[] = "$Id: netdate.c,v 1.4 1993/08/01 19:00:17 mycroft Exp $"; 37 #endif /* not lint */ 38 39 #include <sys/param.h> 40 #include <sys/time.h> 41 #include <sys/socket.h> 42 #include <sys/errno.h> 43 #include <netinet/in.h> 44 #include <netdb.h> 45 #define TSPTYPES 46 #include <protocols/timed.h> 47 #include <unistd.h> 48 #include <stdio.h> 49 #include <string.h> 50 51 #define WAITACK 2 /* seconds */ 52 #define WAITDATEACK 5 /* seconds */ 53 54 extern int retval; 55 56 /* 57 * Set the date in the machines controlled by timedaemons by communicating the 58 * new date to the local timedaemon. If the timedaemon is in the master state, 59 * it performs the correction on all slaves. If it is in the slave state, it 60 * notifies the master that a correction is needed. 61 * Returns 0 on success. Returns > 0 on failure, setting retval to 2; 62 */ 63 netsettime(tval) 64 time_t tval; 65 { 66 struct timeval tout; 67 struct servent *sp; 68 struct tsp msg; 69 struct sockaddr_in sin, dest, from; 70 fd_set ready; 71 long waittime; 72 int s, length, port, timed_ack, found, err; 73 char hostname[MAXHOSTNAMELEN]; 74 75 if ((sp = getservbyname("timed", "udp")) == NULL) { 76 (void)fprintf(stderr, "date: udp/timed: unknown service.n"); 77 return (retval = 2); 78 } 79 80 dest.sin_port = sp->s_port; 81 dest.sin_family = AF_INET; 82 dest.sin_addr.s_addr = htonl((u_long)INADDR_ANY); 83 s = socket(AF_INET, SOCK_DGRAM, 0); 84 if (s < 0) { 85 if (errno != EPROTONOSUPPORT) 86 perror("date: timed"); 87 return(retval = 2); 88 } 89 90 bzero((char *)&sin, sizeof(sin)); 91 sin.sin_family = AF_INET; 92 for (port = IPPORT_RESERVED - 1; port > IPPORT_RESERVED / 2; port--) { 93 sin.sin_port = htons((u_short)port); 94 if (bind(s, (struct sockaddr *)&sin, sizeof(sin)) >= 0) 95 break; 96 if (errno == EADDRINUSE) 97 continue; 98 if (errno != EADDRNOTAVAIL) 99 perror("date: bind"); 100 goto bad; 101 } 102 if (port == IPPORT_RESERVED / 2) { 103 (void)fprintf(stderr, "date: all ports in use.\n"); 104 goto bad; 105 } 106 msg.tsp_type = TSP_SETDATE; 107 msg.tsp_vers = TSPVERSION; 108 if (gethostname(hostname, sizeof(hostname))) { 109 perror("date: gethostname"); 110 goto bad; 111 } 112 (void)strncpy(msg.tsp_name, hostname, sizeof(hostname)); 113 msg.tsp_seq = htons((u_short)0); 114 msg.tsp_time.tv_sec = htonl((u_long)tval); 115 msg.tsp_time.tv_usec = htonl((u_long)0); 116 length = sizeof(struct sockaddr_in); 117 if (connect(s, (struct sockaddr *)&dest, length) < 0) { 118 perror("date: connect"); 119 goto bad; 120 } 121 if (send(s, (char *)&msg, sizeof(struct tsp), 0) < 0) { 122 if (errno != ECONNREFUSED) 123 perror("date: send"); 124 goto bad; 125 } 126 127 timed_ack = -1; 128 waittime = WAITACK; 129 loop: 130 tout.tv_sec = waittime; 131 tout.tv_usec = 0; 132 133 FD_ZERO(&ready); 134 FD_SET(s, &ready); 135 found = select(FD_SETSIZE, &ready, (fd_set *)0, (fd_set *)0, &tout); 136 137 length = sizeof(err); 138 if (!getsockopt(s, SOL_SOCKET, SO_ERROR, (char *)&err, &length) 139 && err) { 140 if (err != ECONNREFUSED) 141 perror("date: send (delayed error)"); 142 goto bad; 143 } 144 145 if (found > 0 && FD_ISSET(s, &ready)) { 146 length = sizeof(struct sockaddr_in); 147 if (recvfrom(s, &msg, sizeof(struct tsp), 0, 148 (struct sockaddr *)&from, &length) < 0) { 149 if (errno != ECONNREFUSED) 150 perror("date: recvfrom"); 151 goto bad; 152 } 153 msg.tsp_seq = ntohs(msg.tsp_seq); 154 msg.tsp_time.tv_sec = ntohl(msg.tsp_time.tv_sec); 155 msg.tsp_time.tv_usec = ntohl(msg.tsp_time.tv_usec); 156 switch (msg.tsp_type) { 157 case TSP_ACK: 158 timed_ack = TSP_ACK; 159 waittime = WAITDATEACK; 160 goto loop; 161 case TSP_DATEACK: 162 (void)close(s); 163 return (0); 164 default: 165 (void)fprintf(stderr, 166 "date: wrong ack received from timed: %s.\n", 167 tsptype[msg.tsp_type]); 168 timed_ack = -1; 169 break; 170 } 171 } 172 if (timed_ack == -1) 173 (void)fprintf(stderr, 174 "date: can't reach time daemon, time set locally.\n"); 175 176 bad: 177 (void)close(s); 178 return(retval = 2); 179 } 180