158 lines
3.8 KiB
C
158 lines
3.8 KiB
C
/*
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* Sun RPC is a product of Sun Microsystems, Inc. and is provided for
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* unrestricted use provided that this legend is included on all tape
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* media and as a part of the software program in whole or part. Users
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* may copy or modify Sun RPC without charge, but are not authorized
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* to license or distribute it to anyone else except as part of a product or
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* program developed by the user.
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*
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* SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
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* WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
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*
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* Sun RPC is provided with no support and without any obligation on the
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* part of Sun Microsystems, Inc. to assist in its use, correction,
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* modification or enhancement.
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*
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* SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
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* INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
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* OR ANY PART THEREOF.
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*
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* In no event will Sun Microsystems, Inc. be liable for any lost revenue
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* or profits or other special, indirect and consequential damages, even if
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* Sun has been advised of the possibility of such damages.
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*
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* Sun Microsystems, Inc.
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* 2550 Garcia Avenue
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* Mountain View, California 94043
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*/
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/*
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* Copyright (c) 1988 by Sun Microsystems, Inc.
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*/
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/*
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* rtime - get time from remote machine
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*
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* gets time, obtaining value from host
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* on the udp/time socket. Since timeserver returns
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* with time of day in seconds since Jan 1, 1900, must
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* subtract seconds before Jan 1, 1970 to get
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* what unix uses.
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*/
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <errno.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/time.h>
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#include <netinet/in.h>
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#include <stdio.h>
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#include <netdb.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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/* from: static char sccsid[] = "@(#)rtime.c 2.2 88/08/10 4.0 RPCSRC; from 1.8 88/02/08 SMI"; */
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static const char rcsid[] = "$Id$";
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#endif
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extern int _rpc_dtablesize __P(( void ));
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#define NYEARS (unsigned long)(1970 - 1900)
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#define TOFFSET (unsigned long)(60*60*24*(365*NYEARS + (NYEARS/4)))
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static void do_close __P(( int ));
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int
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rtime(addrp, timep, timeout)
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struct sockaddr_in *addrp;
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struct timeval *timep;
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struct timeval *timeout;
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{
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int s;
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fd_set readfds;
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int res;
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unsigned long thetime;
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struct sockaddr_in from;
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int fromlen;
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int type;
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struct servent *serv;
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if (timeout == NULL) {
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type = SOCK_STREAM;
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} else {
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type = SOCK_DGRAM;
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}
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s = socket(AF_INET, type, 0);
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if (s < 0) {
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return(-1);
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}
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addrp->sin_family = AF_INET;
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/* TCP and UDP port are the same in this case */
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if ((serv = getservbyname("time", "tcp")) == NULL) {
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return(-1);
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}
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addrp->sin_port = serv->s_port;
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if (type == SOCK_DGRAM) {
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res = sendto(s, (char *)&thetime, sizeof(thetime), 0,
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(struct sockaddr *)addrp, sizeof(*addrp));
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if (res < 0) {
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do_close(s);
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return(-1);
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}
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do {
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FD_ZERO(&readfds);
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FD_SET(s, &readfds);
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res = select(_rpc_dtablesize(), &readfds,
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(fd_set *)NULL, (fd_set *)NULL, timeout);
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} while (res < 0 && errno == EINTR);
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if (res <= 0) {
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if (res == 0) {
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errno = ETIMEDOUT;
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}
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do_close(s);
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return(-1);
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}
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fromlen = sizeof(from);
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res = recvfrom(s, (char *)&thetime, sizeof(thetime), 0,
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(struct sockaddr *)&from, &fromlen);
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do_close(s);
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if (res < 0) {
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return(-1);
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}
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} else {
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if (connect(s, (struct sockaddr *)addrp, sizeof(*addrp)) < 0) {
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do_close(s);
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return(-1);
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}
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res = read(s, (char *)&thetime, sizeof(thetime));
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do_close(s);
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if (res < 0) {
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return(-1);
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}
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}
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if (res != sizeof(thetime)) {
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errno = EIO;
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return(-1);
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}
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thetime = ntohl(thetime);
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timep->tv_sec = thetime - TOFFSET;
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timep->tv_usec = 0;
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return(0);
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}
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static void
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do_close(s)
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int s;
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{
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int save;
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save = errno;
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(void) close(s);
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errno = save;
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}
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