144 lines
4.0 KiB
C
144 lines
4.0 KiB
C
/*
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* Copyright (c) 2010, Oracle America, Inc.
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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
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* met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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* * Neither the name of the "Oracle America, 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
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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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 <stdio.h>
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#include <unistd.h>
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#include <rpc/rpc.h>
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#include <rpc/clnt.h>
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#include <sys/types.h>
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#include <sys/poll.h>
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#include <sys/socket.h>
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#include <sys/time.h>
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#include <rpc/auth_des.h>
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#include <errno.h>
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#include <netinet/in.h>
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#define NYEARS (u_long)(1970 - 1900)
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#define TOFFSET (u_long)(60*60*24*(365*NYEARS + (NYEARS/4)))
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static void do_close (int);
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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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__close (s);
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__set_errno (save);
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}
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int
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rtime (struct sockaddr_in *addrp, struct rpc_timeval *timep,
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struct rpc_timeval *timeout)
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{
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int s;
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struct pollfd fd;
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int milliseconds;
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int res;
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/* RFC 868 says the time is transmitted as a 32-bit value. */
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uint32_t 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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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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s = __socket (AF_INET, type, 0);
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if (s < 0)
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return (-1);
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addrp->sin_family = AF_INET;
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addrp->sin_port = htons (IPPORT_TIMESERVER);
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if (type == SOCK_DGRAM)
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{
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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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{
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do_close (s);
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return -1;
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}
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milliseconds = (timeout->tv_sec * 1000) + (timeout->tv_usec / 1000);
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fd.fd = s;
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fd.events = POLLIN;
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do
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res = __poll (&fd, 1, milliseconds);
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while (res < 0 && errno == EINTR);
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if (res <= 0)
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{
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if (res == 0)
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__set_errno (ETIMEDOUT);
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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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{
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if (__connect (s, (struct sockaddr *) addrp, sizeof (*addrp)) < 0)
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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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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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if (res != sizeof (thetime))
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{
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__set_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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libc_hidden_nolink (rtime, GLIBC_2_1)
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