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/*
* Copyright (c) 2010, Oracle America, Inc.
*
* 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 the "Oracle America, 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.
*/
/*
* 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 <stdio.h>
#include <unistd.h>
#include <rpc/rpc.h>
#include <rpc/clnt.h>
#include <sys/types.h>
#include <sys/poll.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <rpc/auth_des.h>
#include <errno.h>
#include <netinet/in.h>
#define NYEARS (u_long)(1970 - 1900)
#define TOFFSET (u_long)(60*60*24*(365*NYEARS + (NYEARS/4)))
static void do_close (int);
static void
do_close (int s)
{
int save;
save = errno;
__close (s);
__set_errno (save);
}
int
rtime (struct sockaddr_in *addrp, struct rpc_timeval *timep,
struct rpc_timeval *timeout)
{
int s;
struct pollfd fd;
int milliseconds;
int res;
/* RFC 868 says the time is transmitted as a 32-bit value. */
uint32_t thetime;
struct sockaddr_in from;
socklen_t fromlen;
int type;
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;
addrp->sin_port = htons (IPPORT_TIMESERVER);
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)
__set_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))
{
__set_errno (EIO);
return -1;
}
thetime = ntohl (thetime);
timep->tv_sec = thetime - TOFFSET;
timep->tv_usec = 0;
return 0;
}
libc_hidden_nolink (rtime, GLIBC_2_1)
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