/// <summary>This method handles IPPackets that come from the TAP Device, i.e.,
/// local system.</summary>
/// <remarks>Currently this supports HandleMulticast (ip[0] >= 244 &&
/// ip[0]<=239), HandleDns (dport = 53 and ip[3] == 1), dhcp (sport 68 and
/// dport 67.</remarks>
/// <param name="packet">The packet from the TAP device</param>
/// <param name="from"> This should always be the tap device</param>
protected virtual void HandleIPOut(EthernetPacket packet, ISender ret)
{
IPPacket ipp = new IPPacket(packet.Payload);
if (IpopLog.PacketLog.Enabled)
{
ProtocolLog.Write(IpopLog.PacketLog, String.Format(
"Outgoing {0} packet::IP src: {1}, IP dst: {2}",
ipp.Protocol, ipp.SSourceIP, ipp.SDestinationIP));
}
if (!IsLocalIP(ipp.SourceIP))
{
HandleNewStaticIP(packet.SourceAddress, ipp.SourceIP);
return;
}
UdpPacket udpp = null;
switch (ipp.Protocol)
{
case IPPacket.Protocols.Udp:
udpp = new UdpPacket(ipp.Payload);
if (udpp.SourcePort == _dhcp_client_port && udpp.DestinationPort == _dhcp_server_port)
{
if (HandleDhcp(ipp))
{
return;
}
}
else if (udpp.DestinationPort == 53 && ipp.DestinationIP.Equals(_dhcp_server.ServerIP))
{
if (HandleDns(ipp))
{
return;
}
}
break;
}
if (ipp.DestinationIP[0] >= 224 && ipp.DestinationIP[0] <= 239)
{
// We don't want to send Brunet multicast packets over IPOP!
if (udpp != null && udpp.DestinationPort == IPHandler.mc_port)
{
return;
}
else if (HandleMulticast(ipp))
{
return;
}
}
if (ipp.DestinationIP.Equals(IPPacket.BroadcastAddress))
{
if (HandleBroadcast(ipp))
{
return;
}
}
if (HandleOther(ipp))
{
return;
}
if (_dhcp_server == null || ipp.DestinationIP.Equals(_dhcp_server.ServerIP))
{
return;
}
Address target = null;
try {
target = _address_resolver.Resolve(ipp.DestinationIP) as AHAddress;
} catch (AddressResolutionException ex) {
if (ex.Issue != AddressResolutionException.Issues.DoesNotExist)
{
throw;
}
// Otherwise nothing to do, mapping doesn't exist...
}
if (target != null)
{
if (IpopLog.PacketLog.Enabled)
{
ProtocolLog.Write(IpopLog.PacketLog, String.Format(
"Brunet destination ID: {0}", target));
}
SendIP(target, packet.Payload);
_ondemand.Set(target);
}
}
public void ConnectTo(Address dst)
{
_ondemand.Set(dst);
}
