DNS if u need it

// dgrammView.cpp : implementation of the CDgrammView class
//

#include "stdafx.h"
#include "dgramm.h"

#include "dgrammDoc.h"
#include "dgrammView.h"
#include "dnsresolver.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// CDgrammView

IMPLEMENT_DYNCREATE(CDgrammView, CEditView)

BEGIN_MESSAGE_MAP(CDgrammView, CEditView)
	//{{AFX_MSG_MAP(CDgrammView)
	ON_COMMAND(ID_SEND, OnSend)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CDgrammView construction/destruction

CDgrammView::CDgrammView()
{
}

CDgrammView::~CDgrammView()
{
}

BOOL CDgrammView::PreCreateWindow(CREATESTRUCT& cs)
{
	// TODO: Modify the Window class or styles here by modifying
	//  the CREATESTRUCT cs

	BOOL bPreCreated = CEditView::PreCreateWindow(cs);
	cs.style &= ~(ES_AUTOHSCROLL|WS_HSCROLL);	// Enable word-wrapping

	return bPreCreated;
}

/////////////////////////////////////////////////////////////////////////////
// CDgrammView drawing

void CDgrammView::OnDraw(CDC* /* pDC*/)
{
	CDgrammDoc* pDoc = GetDocument();
	ASSERT_VALID(pDoc);
	// TODO: add draw code for native data here
}

/////////////////////////////////////////////////////////////////////////////
// CDgrammView diagnostics

#ifdef _DEBUG
void CDgrammView::AssertValid() const
{
	CEditView::AssertValid();
}

void CDgrammView::Dump(CDumpContext& dc) const
{
	CEditView::Dump(dc);
}

CDgrammDoc* CDgrammView::GetDocument() // non-debug version is inline
{
	ASSERT(m_pDocument->IsKindOf(RUNTIME_CLASS(CDgrammDoc)));
	return (CDgrammDoc*)m_pDocument;
}
#endif //_DEBUG

/////////////////////////////////////////////////////////////////////////////
// CDgrammView message handlers

void CDgrammView::OnInitialUpdate() 
{
	CEditView::OnInitialUpdate();
/*
	{
		CDnsResolver dns;
		if (dns.Create("192.168.0.1")){
			CStringArray arr;
			if (dns.GetMX("hotbot.com", arr))
			{
				for(int i=0; i<arr.GetSize(); i++)
					Message(arr.GetAt(i));
			};
		}
	}
*/
	m_Socket.Init(this);

	//	Create socket object
	if (m_Socket.Create(1701, SOCK_DGRAM))
	{
		Message("Port opened");
	}else{
		Message("Can't open socket");
	};
}

//	Output text string to screen
void CDgrammView::Message(LPCSTR msg)
{
	CString tmp(msg);
	tmp += "\r\n";
	int len = GetEditCtrl().GetWindowTextLength();
	GetEditCtrl().SetSel(len, len);
	GetEditCtrl().ReplaceSel(tmp);
}

void CDgrammView::OnSend() 
{
	if (m_Dlg.DoModal()!=IDOK) return;

	GetEditCtrl().SetWindowText("Wait for answer...\r\n\r\n");
	m_Dns.Empty();

	_DNSRR rr(m_Dns);				//	DNS resource structure

	rr.q.qName.Add(m_Dlg.m_Host);	//	Adding host name to query
	rr.q.Type = typeAll;
	rr.q.Class = classIN;

	rr.Normalize();					//	Convert byte ordering
	rr.Add(m_Dns, m_Dns.Offset);	//	Fill DNS structure with data for query

	m_Dns.Normalize();				//	Convert byte ordering

	//	Sending ready data to DNS server
	if (m_Socket.SendTo(&m_Dns, m_Dns.GetSize(), 53, m_Dlg.m_Dns) != m_Dns.GetSize())
	{
		Message("Error sending datagramm to DNS server!\r\n");
	};
	//	Swith back byte ordering
	m_Dns.Normalize();
}