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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2004 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
/* All Rights Reserved */
/*
* University Copyright- Copyright (c) 1982, 1986, 1988
* The Regents of the University of California
* All Rights Reserved
*
* University Acknowledgment- Portions of this document are derived from
* software developed by the University of California, Berkeley, and its
* contributors.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
/*
* 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 <sys/types.h>
#include <stdio.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <errno.h>
#include <netinet/in.h>
#include <malloc.h>
#define NYEARS (1970 - 1900)
#define TOFFSET ((uint_t)60*60*24*(365*NYEARS + (NYEARS/4)))
extern int _socket(int, int, int);
extern int _sendto(int, const char *, int, int,
const struct sockaddr *, int);
extern int _recvfrom(int, char *, int, int,
struct sockaddr *, int *);
extern int _connect(int, struct sockaddr *, int);
extern int __rpc_dtbsize();
extern ssize_t read(int, void *, size_t);
extern int close(int);
static void do_close();
int
rtime(addrp, timep, timeout)
struct sockaddr_in *addrp;
struct timeval *timep;
struct timeval *timeout;
{
int s;
fd_set readfds;
int res;
uint_t thetime;
struct sockaddr_in from;
int 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);
}
do {
FD_ZERO(&readfds);
FD_SET(s, &readfds);
res = select(__rpc_dtbsize(), &readfds, NULL,
NULL, timeout);
} 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);
thetime = thetime - TOFFSET;
#ifdef _ILP32
if (thetime > INT32_MAX)
thetime = INT32_MAX;
#endif
timep->tv_sec = thetime;
timep->tv_usec = 0;
return (0);
}
static void
do_close(s)
int s;
{
int save;
save = errno;
(void) close(s);
errno = save;
}
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