/*
* Copyright (c) 2009, Sun Microsystems, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* - Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* - Neither the name of Sun Microsystems, Inc. nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Copyright (c) 1988 by Sun Microsystems, Inc.
*/
/*
* rtime - get time from remote machine
*
* gets time, obtaining value from host
* on the udp/time socket. Since timeserver returns
* with time of day in seconds since Jan 1, 1900, must
* subtract seconds before Jan 1, 1970 to get
* what unix uses.
*/
#include <pthread.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/poll.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <netinet/in.h>
#include <stdio.h>
#include <netdb.h>
#include <sys/select.h>
extern int _rpc_dtablesize( void );
#define NYEARS (unsigned long)(1970 - 1900)
#define TOFFSET (unsigned long)(60*60*24*(365*NYEARS + (NYEARS/4)))
static void do_close( int );
int
rtime(addrp, timep, timeout)
struct sockaddr_in *addrp;
struct timeval *timep;
struct timeval *timeout;
{
int s;
struct pollfd fd;
int milliseconds;
int res;
unsigned long thetime;
struct sockaddr_in from;
socklen_t fromlen;
int type;
struct servent *serv;
if (timeout == NULL) {
type = SOCK_STREAM;
} else {
type = SOCK_DGRAM;
}
s = socket(AF_INET, type, 0);
if (s < 0) {
return(-1);
}
addrp->sin_family = AF_INET;
/* TCP and UDP port are the same in this case */
if ((serv = getservbyname("time", "tcp")) == NULL) {
do_close(s);
return(-1);
}
addrp->sin_port = serv->s_port;
if (type == SOCK_DGRAM) {
res = sendto(s, (char *)&thetime, sizeof(thetime), 0,
(struct sockaddr *)addrp, sizeof(*addrp));
if (res < 0) {
do_close(s);
return(-1);
}
milliseconds = (timeout->tv_sec * 1000) + (timeout->tv_usec / 1000);
fd.fd = s;
fd.events = POLLIN;
do
res = poll (&fd, 1, milliseconds);
while (res < 0 && errno == EINTR);
if (res <= 0) {
if (res == 0) {
errno = ETIMEDOUT;
}
do_close(s);
return(-1);
}
fromlen = sizeof(from);
res = recvfrom(s, (char *)&thetime, sizeof(thetime), 0,
(struct sockaddr *)&from, &fromlen);
do_close(s);
if (res < 0) {
return(-1);
}
} else {
if (connect(s, (struct sockaddr *)addrp, sizeof(*addrp)) < 0) {
do_close(s);
return(-1);
}
res = read(s, (char *)&thetime, sizeof(thetime));
do_close(s);
if (res < 0) {
return(-1);
}
}
if (res != sizeof(thetime)) {
errno = EIO;
return(-1);
}
thetime = ntohl(thetime);
timep->tv_sec = thetime - TOFFSET;
timep->tv_usec = 0;
return(0);
}
static void
do_close(s)
int s;
{
int save;
save = errno;
(void)close(s);
errno = save;
}