1 /* $OpenBSD: rfc868time.c,v 1.7 2009/10/27 23:59:54 deraadt Exp $ */ 2 /* $NetBSD: rdate.c,v 1.4 1996/03/16 12:37:45 pk Exp $ */ 3 4 /* 5 * Copyright (c) 1994 Christos Zoulas 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by Christos Zoulas. 19 * 4. The name of the author may not be used to endorse or promote products 20 * derived from this software without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 25 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34 /* 35 * rdate.c: Set the date from the specified host 36 * 37 * Uses the rfc868 time protocol at socket 37 (tcp). 38 * Time is returned as the number of seconds since 39 * midnight January 1st 1900. 40 */ 41 42 #include <sys/param.h> 43 #include <sys/socket.h> 44 #include <sys/time.h> 45 #include <netinet/in.h> 46 47 #include <stdio.h> 48 #include <ctype.h> 49 #include <err.h> 50 #include <string.h> 51 #include <netdb.h> 52 #include <unistd.h> 53 #include <time.h> 54 55 /* Obviously it is not just for SNTP clients... */ 56 #include "ntpleaps.h" 57 58 /* seconds from midnight Jan 1900 - 1970 */ 59 #define DIFFERENCE 2208988800UL 60 61 62 void 63 rfc868time_client (const char *hostname, int family, struct timeval *new, 64 struct timeval *adjust, int leapflag) 65 { 66 struct addrinfo hints, *res0, *res; 67 struct timeval old; 68 u_int32_t tim; /* RFC 868 states clearly this is an uint32 */ 69 int s; 70 int error; 71 u_int64_t td; 72 73 memset(&hints, 0, sizeof(hints)); 74 hints.ai_family = family; 75 hints.ai_socktype = SOCK_STREAM; 76 /* XXX what about rfc868 UDP 77 * probably not due to the Y2038 issue -mirabile */ 78 error = getaddrinfo(hostname, "time", &hints, &res0); 79 if (error) { 80 errx(1, "%s: %s", hostname, gai_strerror(error)); 81 /*NOTREACHED*/ 82 } 83 84 s = -1; 85 for (res = res0; res; res = res->ai_next) { 86 s = socket(res->ai_family, res->ai_socktype, res->ai_protocol); 87 if (s < 0) 88 continue; 89 90 if (connect(s, res->ai_addr, res->ai_addrlen) < 0) { 91 close(s); 92 s = -1; 93 continue; 94 } 95 96 break; 97 } 98 if (s < 0) 99 err(1, "Could not connect socket"); 100 freeaddrinfo(res0); 101 102 if (read(s, &tim, sizeof(tim)) != sizeof(tim)) 103 err(1, "Could not read data"); 104 105 (void) close(s); 106 tim = ntohl(tim) - DIFFERENCE; 107 108 if (gettimeofday(&old, NULL) == -1) 109 err(1, "Could not get local time of day"); 110 111 td = SEC_TO_TAI64(old.tv_sec); 112 if (leapflag) 113 ntpleaps_sub(&td); 114 115 adjust->tv_sec = tim - TAI64_TO_SEC(td); 116 adjust->tv_usec = 0; 117 118 new->tv_sec = old.tv_sec + adjust->tv_sec; 119 new->tv_usec = 0; 120 } 121