157 lines
4.1 KiB
C
157 lines
4.1 KiB
C
/*-
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* Copyright (c) 2009, Sun Microsystems, Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* - Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* - Neither the name of Sun Microsystems, Inc. nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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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 "namespace.h"
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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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#include "un-namespace.h"
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#if defined(LIBC_SCCS) && !defined(lint)
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static char sccsid[] = "@(#)rtime.c 2.2 88/08/10 4.0 RPCSRC; from 1.8 88/02/08 SMI";
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#endif
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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extern int _rpc_dtablesize( 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( int );
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int
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rtime(struct sockaddr_in *addrp, 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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socklen_t 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(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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