1 /* $NetBSD: rdate.c,v 1.10 2000/02/05 22:14:20 kleink Exp $ */ 2 3 /* 4 * Copyright (c) 1994 Christos Zoulas 5 * 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 Christos Zoulas. 18 * 4. The name of the author may not be used to endorse or promote products 19 * derived from this software without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 /* 34 * rdate.c: Set the date from the specified host 35 * 36 * Uses the rfc868 time protocol at socket 37. 37 * Time is returned as the number of seconds since 38 * midnight January 1st 1900. 39 */ 40 #include <sys/cdefs.h> 41 #ifndef lint 42 __RCSID("$NetBSD: rdate.c,v 1.10 2000/02/05 22:14:20 kleink Exp $"); 43 #endif/* lint */ 44 45 #include <sys/types.h> 46 #include <sys/socket.h> 47 #include <sys/time.h> 48 49 #include <netinet/in.h> 50 51 #include <ctype.h> 52 #include <err.h> 53 #include <netdb.h> 54 #include <stdio.h> 55 #include <string.h> 56 #include <unistd.h> 57 #include <util.h> 58 59 /* seconds from midnight Jan 1900 - 1970 */ 60 #if __STDC__ 61 #define DIFFERENCE 2208988800UL 62 #else 63 #define DIFFERENCE 2208988800 64 #endif 65 66 extern char *__progname; 67 68 int main __P((int, char **)); 69 static void usage __P((void)); 70 71 static void 72 usage() 73 { 74 (void) fprintf(stderr, "Usage: %s [-psa] host\n", __progname); 75 (void) fprintf(stderr, " -p: just print, don't set\n"); 76 (void) fprintf(stderr, " -s: just set, don't print\n"); 77 (void) fprintf(stderr, " -a: use adjtime instead of instant change\n"); 78 } 79 80 int 81 main(argc, argv) 82 int argc; 83 char *argv[]; 84 { 85 int pr = 0, silent = 0, s; 86 int slidetime = 0; 87 int adjustment; 88 time_t tim; 89 char *hname, *emsg; 90 struct addrinfo hints, *res, *res0; 91 int c; 92 int error; 93 94 adjustment = 0; 95 while ((c = getopt(argc, argv, "psa")) != -1) 96 switch (c) { 97 case 'p': 98 pr++; 99 break; 100 101 case 's': 102 silent++; 103 break; 104 105 case 'a': 106 slidetime++; 107 break; 108 109 default: 110 usage(); 111 return 1; 112 } 113 114 if (argc - 1 != optind) { 115 usage(); 116 return 1; 117 } 118 hname = argv[optind]; 119 120 memset(&hints, 0, sizeof (hints)); 121 hints.ai_family = PF_UNSPEC; 122 hints.ai_socktype = SOCK_STREAM; 123 hints.ai_flags = AI_CANONNAME; 124 error = getaddrinfo(hname, "time", &hints, &res0); 125 if (error) 126 errx(1, "%s: %s", gai_strerror(error), hname); 127 128 for (res = res0, s = -1; res != NULL; res = res->ai_next) { 129 s = socket(res->ai_family, res->ai_socktype, res->ai_protocol); 130 if (s < 0) { 131 emsg = "socket"; 132 continue; 133 } 134 135 if (connect(s, res->ai_addr, res->ai_addrlen)) { 136 close(s); 137 s = -1; 138 emsg = "connect"; 139 continue; 140 } 141 142 break; 143 } 144 if (s < 0) 145 err(1, emsg); 146 147 if (read(s, &tim, sizeof(time_t)) != sizeof(time_t)) 148 err(1, "Could not read data"); 149 150 (void) close(s); 151 tim = ntohl(tim) - DIFFERENCE; 152 153 if (!pr) { 154 struct timeval tv; 155 if (!slidetime) { 156 logwtmp("|", "date", ""); 157 tv.tv_sec = tim; 158 tv.tv_usec = 0; 159 if (settimeofday(&tv, NULL) == -1) 160 err(1, "Could not set time of day"); 161 logwtmp("{", "date", ""); 162 } else { 163 struct timeval tv_current; 164 if (gettimeofday(&tv_current, NULL) == -1) 165 err(1, "Could not get local time of day"); 166 adjustment = tv.tv_sec = tim - tv_current.tv_sec; 167 tv.tv_usec = 0; 168 if (adjtime(&tv, NULL) == -1) 169 err(1, "Could not adjust time of day"); 170 } 171 } 172 173 if (!silent) { 174 (void) fputs(ctime(&tim), stdout); 175 if (slidetime) 176 (void) fprintf(stdout, 177 "%s: adjust local clock by %d seconds\n", 178 __progname, adjustment); 179 } 180 return 0; 181 } 182