// NOTE: this is the magic method where the nio and net implementations come together
public static DhcpV6Message HandleMessage(IPAddress localAddress, DhcpV6Message dhcpMessage, IPAddress v4IPAddress = null)
{
DhcpV6Message replyMessage = null;
if (dhcpMessage is DhcpV6RelayMessage)
{
//if (dhcpMessage.GetMessageType() == DhcpConstants.V6MESSAGE_TYPE_RELAY_FORW)
//{
// DhcpV6RelayMessage relayMessage = (DhcpV6RelayMessage)(dhcpMessage);
// replyMessage = DhcpV6MessageHandler.HandleRelayForward(relayMessage);
//}
//else
//{
// _log.ErrorFormat("Unsupported message type: {0}", dhcpMessage.GetMessageType());
//}
}
else
{
_log.InfoFormat("Handling client request on local client link address: {0}", localAddress.ToString());
replyMessage = DhcpV6MessageHandler.HandleClientRequest(localAddress, dhcpMessage, v4IPAddress);
}
return(replyMessage);
}
private static DhcpV6RelayMessage HandleRelayForward(DhcpV6RelayMessage relayMessage)
{
IPAddress linkAddr = relayMessage.GetLinkAddress();
_log.Info(("Handling relay forward on link address: " + linkAddr.ToString()));
DhcpV6RelayOption relayOption = relayMessage.GetRelayOption();
if ((relayOption != null))
{
DhcpV6Message relayOptionMessage = relayOption.GetDhcpMessage();
while ((relayOptionMessage != null))
{
// check what kind of message is in the option
if ((relayOptionMessage is DhcpV6RelayMessage))
{
// encapsulated message is another relay message
DhcpV6RelayMessage anotherRelayMessage = ((DhcpV6RelayMessage)(relayOptionMessage));
// flip this inner relay_forward into a relay_reply,
// because we reuse the relay message "stack" for the reply
anotherRelayMessage.SetMessageType(DhcpConstants.V6MESSAGE_TYPE_RELAY_REPL);
// reset the client link reference
linkAddr = anotherRelayMessage.GetLinkAddress();
// reset the current relay option reference to the
// encapsulated relay message's relay option
relayOption = anotherRelayMessage.GetRelayOption();
// reset the relayOptionMessage reference to recurse
relayOptionMessage = relayOption.GetDhcpMessage();
}
else
{
// we've peeled off all the layers of the relay message(s),
// so now go handle the client request
_log.Info(("Handling client request on remote client link address: " + linkAddr.ToString()));
DhcpV6Message replyMessage = DhcpV6MessageHandler.HandleClientRequest(linkAddr, relayOptionMessage, null);
if ((replyMessage != null))
{
// replace the original client request message inside
// the relayed message with the generated Reply message
relayOption.SetDhcpMessage(replyMessage);
// flip the outer-most relay_foward into a relay_reply
relayMessage.SetMessageType(DhcpConstants.V6MESSAGE_TYPE_RELAY_REPL);
// return the relay message we started with,
// with each relay "layer" flipped from a relay_forward
// to a relay_reply, and the lowest level relayOption
// will contain our Reply for the client request
return(relayMessage);
}
relayOptionMessage = null;
// done with relayed messages
}
}
}
else
{
_log.Error("Relay message does not contain a relay option");
}
// if we get here, no reply was generated
return(null);
}