public static DhcpV4Message HandleMessage(IPAddress localAddress, DhcpV4Message dhcpMessage)
{
DhcpV4Message replyMessage = null;
if (dhcpMessage.GetOp() == DhcpConstants.V4_OP_REQUEST)
{
IPAddress linkAddress = null;
if (dhcpMessage.GetGiAddr().Equals(DhcpConstants.ZEROADDR_V4))
{
linkAddress = localAddress;
//log.Info("Handling client request on local client link address: " +
// linkAddress.ToString());
}
else
{
linkAddress = dhcpMessage.GetGiAddr();
log.Info("Handling client request on remote client link address: " +
linkAddress.ToString());
}
DhcpV4MsgTypeOption msgTypeOption = (DhcpV4MsgTypeOption)
dhcpMessage.GetDhcpOption(DhcpConstants.V4OPTION_MESSAGE_TYPE);
if (msgTypeOption != null)
{
short msgType = msgTypeOption.GetUnsignedByte();
DhcpV4MessageProcessor processor = null;
switch (msgType)
{
case DhcpConstants.V4MESSAGE_TYPE_DISCOVER:
processor = new DhcpV4DiscoverProcessor(dhcpMessage, linkAddress);
break;
case DhcpConstants.V4MESSAGE_TYPE_REQUEST:
processor = new DhcpV4RequestProcessor(dhcpMessage, linkAddress);
break;
case DhcpConstants.V4MESSAGE_TYPE_DECLINE:
processor = new DhcpV4DeclineProcessor(dhcpMessage, linkAddress);
break;
case DhcpConstants.V4MESSAGE_TYPE_RELEASE:
processor = new DhcpV4ReleaseProcessor(dhcpMessage, linkAddress);
break;
case DhcpConstants.V4MESSAGE_TYPE_INFORM:
processor = new DhcpV4InformProcessor(dhcpMessage, linkAddress);
break;
default:
log.Error("Unknown message type.");
break;
}
if (processor != null)
{
return(processor.ProcessMessage(localAddress));
}
else
{
log.Error("No processor found for message type: " + msgType);
}
}
else
{
log.Error("No message type option found in request.");
}
return(null);
}
else
{
log.Error("Unsupported op code: " + dhcpMessage.GetOp());
}
return(replyMessage);
}