1 /* 2 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for 3 * unrestricted use provided that this legend is included on all tape 4 * media and as a part of the software program in whole or part. Users 5 * may copy or modify Sun RPC without charge, but are not authorized 6 * to license or distribute it to anyone else except as part of a product or 7 * program developed by the user. 8 * 9 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE 10 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR 11 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE. 12 * 13 * Sun RPC is provided with no support and without any obligation on the 14 * part of Sun Microsystems, Inc. to assist in its use, correction, 15 * modification or enhancement. 16 * 17 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE 18 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC 19 * OR ANY PART THEREOF. 20 * 21 * In no event will Sun Microsystems, Inc. be liable for any lost revenue 22 * or profits or other special, indirect and consequential damages, even if 23 * Sun has been advised of the possibility of such damages. 24 * 25 * Sun Microsystems, Inc. 26 * 2550 Garcia Avenue 27 * Mountain View, California 94043 28 */ 29 30 /* 31 * Copyright (c) 1988 by Sun Microsystems, Inc. 32 33 */ 34 35 /* 36 * rtime - get time from remote machine 37 * 38 * gets time, obtaining value from host 39 * on the udp/time socket. Since timeserver returns 40 * with time of day in seconds since Jan 1, 1900, must 41 * subtract seconds before Jan 1, 1970 to get 42 * what unix uses. 43 */ 44 #include <stdlib.h> 45 #include <string.h> 46 #include <unistd.h> 47 #include <errno.h> 48 #include <sys/types.h> 49 #include <sys/socket.h> 50 #include <sys/time.h> 51 #include <netinet/in.h> 52 #include <stdio.h> 53 #include <netdb.h> 54 55 #if defined(LIBC_SCCS) && !defined(lint) 56 /* from: static char sccsid[] = "@(#)rtime.c 2.2 88/08/10 4.0 RPCSRC; from 1.8 88/02/08 SMI"; */ 57 static const char rcsid[] = "$FreeBSD$"; 58 #endif 59 60 extern int _rpc_dtablesize __P(( void )); 61 62 #define NYEARS (unsigned long)(1970 - 1900) 63 #define TOFFSET (unsigned long)(60*60*24*(365*NYEARS + (NYEARS/4))) 64 65 static void do_close __P(( int )); 66 67 int 68 rtime(addrp, timep, timeout) 69 struct sockaddr_in *addrp; 70 struct timeval *timep; 71 struct timeval *timeout; 72 { 73 int s; 74 fd_set readfds; 75 int res; 76 unsigned long thetime; 77 struct sockaddr_in from; 78 int fromlen; 79 int type; 80 struct servent *serv; 81 82 if (timeout == NULL) { 83 type = SOCK_STREAM; 84 } else { 85 type = SOCK_DGRAM; 86 } 87 s = socket(AF_INET, type, 0); 88 if (s < 0) { 89 return(-1); 90 } 91 addrp->sin_family = AF_INET; 92 93 /* TCP and UDP port are the same in this case */ 94 if ((serv = getservbyname("time", "tcp")) == NULL) { 95 return(-1); 96 } 97 98 addrp->sin_port = serv->s_port; 99 100 if (type == SOCK_DGRAM) { 101 res = sendto(s, (char *)&thetime, sizeof(thetime), 0, 102 (struct sockaddr *)addrp, sizeof(*addrp)); 103 if (res < 0) { 104 do_close(s); 105 return(-1); 106 } 107 do { 108 FD_ZERO(&readfds); 109 FD_SET(s, &readfds); 110 res = select(_rpc_dtablesize(), &readfds, 111 (fd_set *)NULL, (fd_set *)NULL, timeout); 112 } while (res < 0 && errno == EINTR); 113 if (res <= 0) { 114 if (res == 0) { 115 errno = ETIMEDOUT; 116 } 117 do_close(s); 118 return(-1); 119 } 120 fromlen = sizeof(from); 121 res = recvfrom(s, (char *)&thetime, sizeof(thetime), 0, 122 (struct sockaddr *)&from, &fromlen); 123 do_close(s); 124 if (res < 0) { 125 return(-1); 126 } 127 } else { 128 if (connect(s, (struct sockaddr *)addrp, sizeof(*addrp)) < 0) { 129 do_close(s); 130 return(-1); 131 } 132 res = _read(s, (char *)&thetime, sizeof(thetime)); 133 do_close(s); 134 if (res < 0) { 135 return(-1); 136 } 137 } 138 if (res != sizeof(thetime)) { 139 errno = EIO; 140 return(-1); 141 } 142 thetime = ntohl(thetime); 143 timep->tv_sec = thetime - TOFFSET; 144 timep->tv_usec = 0; 145 return(0); 146 } 147 148 static void 149 do_close(s) 150 int s; 151 { 152 int save; 153 154 save = errno; 155 (void)_close(s); 156 errno = save; 157 } 158