private void HandleResponse(byte[] buffer)
{
if (buffer[0Xf0 + 42] == 0x35 && buffer[0xf2 + 42] == 0x2) // Offer
{
m_IStatusUpdate.UpdateStatus("Received DHCP Offer");
GetOfferData(ref buffer);
SendRequest();
}
else if (buffer[0Xf0 + 42] == 0x35 && buffer[0xf2 + 42] == 0x5) // ACK
{
string strIP = IPToString(m_dwRequestedIP);
string strSubnetMask = IPToString(m_dwSubnetMask);
m_IStatusUpdate.UpdateStatus("Received DHCP ACK with IP " + strIP);
NetworkManagement networkMgmt = new NetworkManagement();
if (networkMgmt.setIP(MAC, strIP, strSubnetMask))
{
m_IStatusUpdate.UpdateStatus("Set network card IP to " + strIP);
}
else
{
m_IStatusUpdate.UpdateStatus("Failed to change network card IP");
}
m_State = DHCPState.BOUND;
}
}
public void Connect(IStatusUpdate IStatusUpdate)
{
m_State = DHCPState.INIT;
m_bStop = false;
m_IStatusUpdate = IStatusUpdate;
m_Instance = this;
m_Device = null;
m_dtBound = DateTime.MaxValue;
m_FilterThread = new Thread(new ThreadStart(StartFilter));
m_FilterThread.Start();
m_TimerThread = new Thread(new ThreadStart(TimerHandler));
m_TimerThread.Start();
}
private void TimerHandler()
{
DHCPState previousState = m_State;
while (!m_bStop)
{
switch (m_State)
{
case DHCPState.INIT:
previousState = DHCPState.INIT;
SendDiscover();
break;
case DHCPState.DISCOVER:
m_State = DHCPState.INIT;
previousState = DHCPState.DISCOVER;
break;
case DHCPState.BOUND:
if (previousState != m_State)
{
previousState = DHCPState.BOUND;
byte[] temp = BitConverter.GetBytes(m_dwLeaseTime);
Array.Reverse(temp);
int dwLeaseTime = BitConverter.ToInt32(temp, 0);
m_spanLease = new TimeSpan(0, 0, dwLeaseTime / 2);
m_dtBound = DateTime.Now;
}
if (DateTime.Now.Subtract(m_dtBound) > m_spanLease)
{
m_State = DHCPState.INIT;
}
break;
default:
break;
}
Thread.Sleep(5000);
}
}
