110 lines
2.2 KiB
C
110 lines
2.2 KiB
C
#if !defined(lint) && defined(SCCSIDS)
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static char sccsid[] = "@(#)rtime.c 1.1 92/07/30 Copyr 1987 Sun Micro";
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#endif
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/*
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* rtime - get time from remote machine
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*
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* Copyright (C) 1986, Sun Microsystems, Inc.
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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 <sys/types.h>
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#include <sys/socket.h>
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#include <sys/time.h>
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#include <sys/errno.h>
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#include <netinet/in.h>
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#include <stdio.h>
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#define NYEARS (1970 - 1900)
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#define TOFFSET (60*60*24*(365*NYEARS + (NYEARS/4)))
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extern errno;
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static void do_close();
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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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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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addrp->sin_port = htons(IPPORT_TIMESERVER);
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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, (int *)NULL,
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(int *)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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