1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright 2004 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */ 28 /* All Rights Reserved */ 29 30 /* 31 * University Copyright- Copyright (c) 1982, 1986, 1988 32 * The Regents of the University of California 33 * All Rights Reserved 34 * 35 * University Acknowledgment- Portions of this document are derived from 36 * software developed by the University of California, Berkeley, and its 37 * contributors. 38 */ 39 40 /* 41 * rtime - get time from remote machine 42 * 43 * gets time, obtaining value from host 44 * on the udp/time socket. Since timeserver returns 45 * with time of day in seconds since Jan 1, 1900, must 46 * subtract seconds before Jan 1, 1970 to get 47 * what unix uses. 48 */ 49 50 #include <sys/types.h> 51 #include <stdio.h> 52 #include <string.h> 53 #include <sys/socket.h> 54 #include <sys/time.h> 55 #include <errno.h> 56 #include <netinet/in.h> 57 #include <malloc.h> 58 59 #define NYEARS (1970 - 1900) 60 #define TOFFSET ((uint_t)60*60*24*(365*NYEARS + (NYEARS/4))) 61 62 extern int _socket(int, int, int); 63 extern int _sendto(int, const char *, int, int, 64 const struct sockaddr *, int); 65 extern int _recvfrom(int, char *, int, int, 66 struct sockaddr *, int *); 67 extern int _connect(int, struct sockaddr *, int); 68 extern int __rpc_dtbsize(); 69 extern ssize_t read(int, void *, size_t); 70 extern int close(int); 71 static void do_close(); 72 73 int 74 rtime(addrp, timep, timeout) 75 struct sockaddr_in *addrp; 76 struct timeval *timep; 77 struct timeval *timeout; 78 { 79 int s; 80 fd_set readfds; 81 int res; 82 uint_t thetime; 83 struct sockaddr_in from; 84 int fromlen; 85 int type; 86 87 if (timeout == NULL) { 88 type = SOCK_STREAM; 89 } else { 90 type = SOCK_DGRAM; 91 } 92 s = _socket(AF_INET, type, 0); 93 if (s < 0) { 94 return (-1); 95 } 96 addrp->sin_family = AF_INET; 97 addrp->sin_port = htons(IPPORT_TIMESERVER); 98 if (type == SOCK_DGRAM) { 99 res = _sendto(s, (char *)&thetime, sizeof (thetime), 0, 100 (struct sockaddr *)addrp, sizeof (*addrp)); 101 if (res < 0) { 102 do_close(s); 103 return (-1); 104 } 105 do { 106 FD_ZERO(&readfds); 107 FD_SET(s, &readfds); 108 res = select(__rpc_dtbsize(), &readfds, NULL, 109 NULL, timeout); 110 } while (res < 0 && errno == EINTR); 111 if (res <= 0) { 112 if (res == 0) { 113 errno = ETIMEDOUT; 114 } 115 do_close(s); 116 return (-1); 117 } 118 fromlen = sizeof (from); 119 res = _recvfrom(s, (char *)&thetime, sizeof (thetime), 0, 120 (struct sockaddr *)&from, &fromlen); 121 do_close(s); 122 if (res < 0) { 123 return (-1); 124 } 125 } else { 126 if (_connect(s, (struct sockaddr *)addrp, 127 sizeof (*addrp)) < 0) { 128 do_close(s); 129 return (-1); 130 } 131 res = read(s, (char *)&thetime, sizeof (thetime)); 132 do_close(s); 133 if (res < 0) { 134 return (-1); 135 } 136 } 137 if (res != sizeof (thetime)) { 138 errno = EIO; 139 return (-1); 140 } 141 thetime = ntohl(thetime); 142 143 thetime = thetime - TOFFSET; 144 #ifdef _ILP32 145 if (thetime > INT32_MAX) 146 thetime = INT32_MAX; 147 #endif 148 timep->tv_sec = thetime; 149 timep->tv_usec = 0; 150 return (0); 151 } 152 153 static void 154 do_close(s) 155 int s; 156 { 157 int save; 158 159 save = errno; 160 (void) close(s); 161 errno = save; 162 } 163