private static void V4Request()
{
var V4Message = new DhcpV4Message(IPAddress.Any,
new IPEndPoint(IPAddress.Parse("192.168.61.48"), DhcpConstants.V4_SERVER_PORT));
V4Message.SetOp((short)DhcpConstants.V4_OP_REQUEST); //V4_OP_REQUEST
V4Message.SetGiAddr(IPAddress.Any);
V4Message.SetChAddr(PhysicalAddress.Parse("9C-EB-E8-28-92-D4").GetAddressBytes());
DhcpV4MsgTypeOption msgTypeOption = new DhcpV4MsgTypeOption();
msgTypeOption.SetUnsignedByte((short)DhcpConstants.V4MESSAGE_TYPE_REQUEST);
V4Message.PutDhcpOption(msgTypeOption);
V4Message.PutDhcpOption(new DhcpV4RequestedIpAddressOption(
new v4RequestedIpAddressOption()
{
code = DhcpConstants.V4OPTION_REQUESTED_IP,
ipAddress = "192.168.61.140"
}));
V4Message.SetDhcpV4ServerIdOption(
new DhcpV4ServerIdOption(
new v4ServerIdOption()
{
code = DhcpConstants.V4OPTION_SERVERID,
ipAddress = "192.168.61.48"
}));
var message = DhcpV4MessageHandler.HandleMessage(
IPAddress.Parse("192.168.61.48"), V4Message);
Console.WriteLine(message.ToString());
}
public void SetMessageType(short msgType)
{
DhcpV4MsgTypeOption msgTypeOption = new DhcpV4MsgTypeOption();
msgTypeOption.SetUnsignedByte(msgType);
PutDhcpOption(msgTypeOption);
}
public short GetMessageType()
{
DhcpV4MsgTypeOption msgType = (DhcpV4MsgTypeOption)
_dhcpOptions.Get(DhcpConstants.V4OPTION_MESSAGE_TYPE);
if (msgType != null)
{
return(msgType.GetUnsignedByte());
}
return(0);
}
/**
* Builds the discover message.
*
* @return the dhcp message
*/
private DhcpV4Message BuildDiscoverMessage(byte[] chAddr)
{
DhcpV4Message msg = new DhcpV4Message(IPAddress.Parse("0.0.0.0"), new IPEndPoint(serverAddr, serverPort));
msg.SetOp((short)DhcpConstants.V4_OP_REQUEST);
msg.SetTransactionId(GetRandomLong());
msg.SetHtype((short)1); // ethernet
msg.SetHlen((byte)6);
msg.SetChAddr(chAddr);
msg.SetGiAddr(clientAddr); // look like a relay to the DHCP server
DhcpV4MsgTypeOption msgTypeOption = new DhcpV4MsgTypeOption();
msgTypeOption.SetUnsignedByte((short)DhcpConstants.V4MESSAGE_TYPE_DISCOVER);
msg.PutDhcpOption(msgTypeOption);
return(msg);
}
private DhcpV4Message BuildReleaseMessage(DhcpV4Message ack)
{
DhcpV4Message msg = new DhcpV4Message(null, new IPEndPoint(serverAddr, serverPort));
msg.SetOp((short)DhcpConstants.V4_OP_REQUEST);
msg.SetTransactionId(ack.GetTransactionId());
msg.SetHtype((short)1); // ethernet
msg.SetHlen((byte)6);
msg.SetChAddr(ack.GetChAddr());
msg.SetGiAddr(clientAddr); // look like a relay to the DHCP server
msg.SetCiAddr(ack.GetYiAddr());
DhcpV4MsgTypeOption msgTypeOption = new DhcpV4MsgTypeOption();
msgTypeOption.SetUnsignedByte((short)DhcpConstants.V4MESSAGE_TYPE_RELEASE);
msg.PutDhcpOption(msgTypeOption);
return(msg);
}
private static void V4Discover()
{
var V4Message = new DhcpV4Message(IPAddress.Any,
new IPEndPoint(IPAddress.Parse("192.168.61.48"), DhcpConstants.V4_SERVER_PORT));
V4Message.SetOp((short)DhcpConstants.V4_OP_REQUEST); //V4_OP_REQUEST
V4Message.SetGiAddr(IPAddress.Any);
V4Message.SetChAddr(PhysicalAddress.Parse("9C-EB-E8-28-92-D4").GetAddressBytes());
V4Message.SetHlen(6);
V4Message.SetHtype((byte)6);
V4Message.SetTransactionId(-1729018559);
DhcpV4MsgTypeOption msgTypeOption = new DhcpV4MsgTypeOption();
msgTypeOption.SetUnsignedByte((short)DhcpConstants.V4MESSAGE_TYPE_DISCOVER);
V4Message.PutDhcpOption(msgTypeOption);
var message = DhcpV4MessageHandler.HandleMessage(
IPAddress.Parse("192.168.61.48"), V4Message);
Console.WriteLine(message.ToString());
}
private DhcpV4Message BuildRequestMessage(DhcpV4Message offer)
{
DhcpV4Message msg = new DhcpV4Message(IPAddress.Parse("0.0.0.0"), new IPEndPoint(serverAddr, serverPort));
msg.SetOp((short)DhcpConstants.V4_OP_REQUEST);
msg.SetTransactionId(offer.GetTransactionId());
msg.SetHtype((short)1); // ethernet
msg.SetHlen((byte)6);
msg.SetChAddr(offer.GetChAddr());
msg.SetGiAddr(clientAddr); // look like a relay to the DHCP server
DhcpV4MsgTypeOption msgTypeOption = new DhcpV4MsgTypeOption();
msgTypeOption.SetUnsignedByte((short)DhcpConstants.V4MESSAGE_TYPE_REQUEST);
msg.PutDhcpOption(msgTypeOption);
DhcpV4RequestedIpAddressOption reqIpOption = new DhcpV4RequestedIpAddressOption();
reqIpOption.SetIpAddress(offer.GetYiAddr().ToString());
msg.PutDhcpOption(reqIpOption);
return(msg);
}
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);
}
