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Socket Options and IOCTLs 7 part 6

What do we have in this chapter 7 part 6?

Setting the IOCTL SIO_ENABLE_CIRCULAR_QUEUEING Program Example
The SIO_GET_ATM_ADDRESS Program Example

Setting the IOCTL SIO_ENABLE_CIRCULAR_QUEUEING Program Example

Create a new empty Win32 console mode application and add the project/solution name.

Winsock 2 socket options and ioctls: Setting the IOCTL SIO_ENABLE_CIRCULAR_QUEUEING program example

Add the following source code.

// Description:

// This sample shows how to set the ioctl SIO_ENABLE_CIRCULAR_QUEUEING.

// This ioctl is very difficult to prove that it works. You need to

// start blasting datagram packets as quickly as possible and capture

// the results with Microsoft Network Monitor to find out which packets

// got dropped.

// No command Line arguments

// Sio_enable_circular_queueing

// Link to ws2_32.lib

#include <winsock2.h>

#include <ws2tcpip.h>

#include <stdio.h>

// Function: main

// Description:

// Load Winsock, create a socket, and set the ioctl. Afterwards

// call the ioctl again to retrieve its value.

int main(int argc, char **argv)

{

WSADATA wsd;

SOCKET s;

int ret;

DWORD dwBytesRet;

BOOL bOpt;

// Load Winsock

if (WSAStartup(MAKEWORD(2,2), &wsd) != 0)

{

printf("WSAStartup() failed with error code %d\n", WSAGetLastError());

return -1;

}

else

printf("WSAStartup() is OK!\n");

// Creat a socket

s = WSASocket(AF_INET, SOCK_DGRAM, IPPROTO_UDP, NULL, 0, WSA_FLAG_OVERLAPPED);

if (s == INVALID_SOCKET)

{

printf("WSASocket() failed with error code %d\n", WSAGetLastError());

return -1;

}

else

printf("WSASocket() is OK!\n");

// Set the ioctl

printf("Setting the ioctl...\n");

bOpt = TRUE;

ret = WSAIoctl(s, SIO_ENABLE_CIRCULAR_QUEUEING, &bOpt, sizeof(bOpt), NULL, 0, &dwBytesRet, NULL, NULL);

if (ret == SOCKET_ERROR)

{

printf(" WSAIoctl(SIO_ENABLE_CIRCULAR_QUEUEING) failed with error code %d\n", WSAGetLastError());

return -1;

}

else

printf(" WSAIoctl(SIO_ENABLE_CIRCULAR_QUEUEING) is OK!\n");

// Get the ioctl

printf("Getting the ioctl...\n");

ret = WSAIoctl(s, SIO_ENABLE_CIRCULAR_QUEUEING, NULL, 0, &bOpt, sizeof(bOpt), &dwBytesRet, NULL, NULL);

if (ret == SOCKET_ERROR)

{

printf(" WSAIoctl(SIO_ENABLE_CIRCULAR_QUEUEING) failed with error code %d\n", WSAGetLastError());

return -1;

}

else

printf(" WSAIoctl(SIO_ENABLE_CIRCULAR_QUEUEING) is OK!\n");

if (bOpt == TRUE)

printf("Circular queuing is TRUE!\n");

else

printf("Circular queuing is FALSE!\n");

// Cleanup

if(closesocket(s) == 0)

printf("closesocket() should be fine!\n");

else

printf("closesocket() failed with error code %d\n", WSAGetLastError());

if(WSACleanup() == 0)

printf("WSACleanup() is OK!\n");

else

printf("WSACleanup() failed with error code %d\n", WSAGetLastError());

return 0;

}

Build and run the project.

Winsock 2 socket options and ioctls: Setting the IOCTL SIO_ENABLE_CIRCULAR_QUEUEING program example - a sample output

The SIO_GET_ATM_ADDRESS Program Example

Create a new empty Win32 console mode application and add the project/solution name.

Winsock 2 socket options and ioctls: The SIO_GET_ATM_ADDRESS program example

Add the following source code.

#include "support.h"

#include <stdio.h>

int main(int argc, char **argv)

{

WSADATA wsd;

SOCKET s;

DWORD deviceID, bytes, dwAddrLen = 256;

ATM_ADDRESS addr;

SOCKADDR_ATM atm_addr;

char szAddress[256];

WSAPROTOCOL_INFO pProtocolInfo;

if (WSAStartup(MAKEWORD(2,2), &wsd) != 0)

{

printf("WSAStartup() failed with error code %d\n", WSAGetLastError());

return -1;

}

else

printf("WSAStartup() is OK!\n");

if (FindProtocol(&pProtocolInfo) == FALSE)

{

printf("FindProtocol() returned NULL for ATM. Check the ATM adapter/NIC!!\n");

WSACleanup();

return -1;

}

else

printf("FindProtocol() returned something for ATM!\n");

s = WSASocket(FROM_PROTOCOL_INFO, FROM_PROTOCOL_INFO, FROM_PROTOCOL_INFO,&pProtocolInfo, 0, WSA_FLAG_OVERLAPPED);

if (s == INVALID_SOCKET)

{

printf("WSASocket() failed with error code %d\n", WSAGetLastError());

WSACleanup();

return -1;

}

else

printf("WSASocket() is OK!\n");

deviceID = 0;

if (WSAIoctl(s, SIO_GET_ATM_ADDRESS, (LPVOID) &deviceID,

sizeof(DWORD), (LPVOID) &addr, sizeof(ATM_ADDRESS),

&bytes, NULL, NULL) == SOCKET_ERROR)

{

printf("WSAIoctl() error %d\n", WSAGetLastError());

WSACleanup();

return -1;

}

else

printf("WSAIoctl() is OK!\n");

ZeroMemory((PVOID)&atm_addr, sizeof(atm_addr));

atm_addr.satm_family = AF_ATM;

atm_addr.satm_number.AddressType = ATM_NSAP;

atm_addr.satm_number.NumofDigits = ATM_ADDR_SIZE;

atm_addr.satm_blli.Layer2Protocol = SAP_FIELD_ANY;

atm_addr.satm_blli.Layer3Protocol = SAP_FIELD_ABSENT;

atm_addr.satm_bhli.HighLayerInfoType = SAP_FIELD_ABSENT;

memcpy(atm_addr.satm_number.Addr, &addr.Addr, ATM_ADDR_SIZE);

ZeroMemory((PVOID)szAddress, sizeof(szAddress));

if (WSAAddressToString((LPSOCKADDR)&atm_addr, sizeof(atm_addr), &pProtocolInfo, (LPWSTR)szAddress, &dwAddrLen))

{

printf("WSAAddressToString() error %d\n", WSAGetLastError());

return(FALSE);

}

else

printf("WSAAddressToString() is fine!\n");

printf("The atm address (if any): <%S>\n", szAddress);

// Cleanup

if(closesocket(s) == 0)

printf("closesocket() should be fine!\n");

else

printf("closesocket() failed with error code %d\n", WSAGetLastError());

if(WSACleanup() == 0)

printf("WSACleanup() is OK!\n");

else

printf("WSACleanup() failed with error code %d\n", WSAGetLastError());

return 0;

}

Add new header file, support.h.

Winsock 2 socket options and ioctls: The SIO_GET_ATM_ADDRESS program example - adding the support.h header file

Add the source code.

// Link to ws2_32.lib

#include <winsock2.h>

#include <ws2atm.h>

// Prototypes

int GetNumATMInterfaces(SOCKET s);

BOOL GetATMAddress(SOCKET s, int device, ATM_ADDRESS *atmaddr);

BOOL FindProtocol(WSAPROTOCOL_INFO *lpProto);

void AtoH( CHAR *szDest, CHAR *szSource, INT iCount );

Add the header file definition, support.cpp.

--------------------------------------------------------------------

Winsock 2 socket options and ioctls: The SIO_GET_ATM_ADDRESS program example - adding the support.cpp, the definition file

Add the source code.

#include "support.h"

#include <stdio.h>

UCHAR BtoH( CHAR ch );

int GetNumATMInterfaces(SOCKET s)

{

DWORD dwNum, nbytes = sizeof(DWORD);

if (WSAIoctl(s, SIO_GET_NUMBER_OF_ATM_DEVICES, NULL, 0,

(LPVOID)&dwNum, sizeof(DWORD), &nbytes, NULL, NULL) == SOCKET_ERROR)

{

return -1;

}

return dwNum;

}

BOOL GetATMAddress(SOCKET s, int device, ATM_ADDRESS *atmaddr)

{

DWORD bytes;

if (WSAIoctl(s, SIO_GET_ATM_ADDRESS, (LPVOID)&device, sizeof(DWORD),

(LPVOID)atmaddr, sizeof(ATM_ADDRESS), &bytes, NULL, NULL) == SOCKET_ERROR)

{

return FALSE;

}

return TRUE;

}

BOOL FindProtocol(WSAPROTOCOL_INFO *lpProto)

{

WSAPROTOCOL_INFO *lpProtocolBuf=NULL;

DWORD dwErr, dwRet, dwBufLen=0, i;

if (WSAEnumProtocols(NULL, lpProtocolBuf, &dwBufLen) != SOCKET_ERROR)

{

// This should never happen as there is a NULL buffer

printf("WSAEnumProtocols() failed!\n");

return FALSE;

}

else if ((dwErr = WSAGetLastError()) != WSAENOBUFS)

{

// We failed for some reason not relating to buffer size - also odd

printf("WSAEnumProtocols() failed with error code %d\n", dwErr);

return FALSE;

}

else

printf("WSAEnumProtocols() should be fine!\n");

// Allocate the correct buffer size for WSAEnumProtocols as well as the buffer to return

lpProtocolBuf = (WSAPROTOCOL_INFO *)GlobalAlloc(GMEM_FIXED, dwBufLen);

if (lpProtocolBuf == NULL)

{

printf("GlobalAlloc() for protocol buffer failed with error code %d\n", GetLastError());

return FALSE;

}

else

printf("GlobalAlloc() is OK for protocol buffer...\n");

dwRet = WSAEnumProtocols(NULL, lpProtocolBuf, &dwBufLen);

if (dwRet == SOCKET_ERROR)

{

printf("WSAEnumProtocols() failed wit herror code %d\n", WSAGetLastError());

GlobalFree(lpProtocolBuf);

return FALSE;

}

else

printf("WSAEnumProtocols() is OK!\n");

// Loop through the returned protocol information looking for those that are in the AF_ATM address family.

for (i=0; i < dwRet ;i++)

{

printf("Protocol: %S\n", lpProtocolBuf[i].szProtocol);

if ( (lpProtocolBuf[i].iAddressFamily == AF_ATM) && (lpProtocolBuf[i].iSocketType == SOCK_RAW) &&

(lpProtocolBuf[i].iProtocol == ATMPROTO_AAL5) )

{

memcpy(lpProto, &lpProtocolBuf[i], sizeof(WSAPROTOCOL_INFO));

GlobalFree(lpProtocolBuf);

return TRUE;

}

GlobalFree(lpProtocolBuf);

return FALSE;

}

// AtoH () coverts the ATM address specified in the string (ascii) format to the binary(hexadecimal) format.

void AtoH( CHAR *szDest, CHAR *szSource, INT iCount )

{

while (iCount--)

{

*szDest++ = ( BtoH ( *szSource++ ) << 4 ) + BtoH ( *szSource++ );

}

return;

}

// BtoH () returns the equivalent binary value for an individual character specified in the ascii format.

UCHAR BtoH( CHAR ch )

{

if ( ch >= '0' && ch <= '9' )

{

return ( ch - '0' );

}

if ( ch >= 'A' && ch <= 'F' )

{

return ( ch - 'A' + 0xA );

}

if (ch >= 'a' && ch <= 'f' )

{

return ( ch - 'a' + 0xA );

}

// Illegal values in the address will not be excepted

return -1;

}

Build and run the project.

Winsock 2 socket options and ioctls: The SIO_GET_ATM_ADDRESS program example - a sample output

< IP_TOS & SIO_ADDRESS_LIST_QUERY Examples | Socket Options & IOCTLs Main | SIO_GET_BROADCAST_ADDRESS & SO_KEEPALIVE_VALS Examples >