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/* This file implements i/o calls that are specific to Windows */
#include <config.h>
#include <stdio.h>
#include "ntp_fp.h"
#include "ntp_net.h"
#include "ntp_stdlib.h"
#include "ntp_syslog.h"
#include "win32_io.h"
#include <isc/win32os.h>
/*
* Define this macro to control the behavior of connection
* resets on UDP sockets. See Microsoft KnowledgeBase Article Q263823
* for details.
* Based on that article, it is surprising that a much newer winsock2.h
* does not define SIO_UDP_CONNRESET (the one that comes with VS 2008).
* NOTE: This requires that Windows 2000 systems install Service Pack 2
* or later.
*/
#ifndef SIO_UDP_CONNRESET
#define SIO_UDP_CONNRESET _WSAIOW(IOC_VENDOR,12)
#endif
void
InitSockets(
void
)
{
WORD wVersionRequested;
WSADATA wsaData;
int err;
/* Need Winsock 2.0 or better */
wVersionRequested = MAKEWORD(2, 0);
err = WSAStartup(wVersionRequested, &wsaData);
if ( err != 0 ) {
SetLastError(err);
mfprintf(stderr, "No usable winsock: %m\n");
SetLastError(err);
msyslog(LOG_ERR, "No usable winsock: %m");
exit(1);
}
}
/*
* Windows 2000 systems incorrectly cause UDP sockets using WASRecvFrom
* to not work correctly, returning a WSACONNRESET error when a WSASendTo
* fails with an "ICMP port unreachable" response and preventing the
* socket from using the WSARecvFrom in subsequent operations.
* The function below fixes this, but requires that Windows 2000
* Service Pack 2 or later be installed on the system. NT 4.0
* systems are not affected by this and work correctly.
* See Microsoft Knowledge Base Article Q263823 for details of this.
*/
void
connection_reset_fix(
SOCKET fd,
sockaddr_u * addr
)
{
DWORD dw;
BOOL bNewBehavior = FALSE;
DWORD status;
/*
* disable bad behavior using IOCTL: SIO_UDP_CONNRESET
* NT 4.0 has no problem
*/
if (isc_win32os_majorversion() >= 5) {
status = WSAIoctl(fd, SIO_UDP_CONNRESET, &bNewBehavior,
sizeof(bNewBehavior), NULL, 0,
&dw, NULL, NULL);
if (SOCKET_ERROR == status)
msyslog(LOG_ERR,
"connection_reset_fix() failed for address %s: %m",
stoa(addr));
}
}
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