private static uint HandlePktSendHook(ref IntPtr Packet, ref uint PacketSize, uint ControlCode, uint IpAddress, IntPtr Reserved, IntPtr PktContext)
{
var stopPropagation = false;
var packet = new DhcpServerPacketWritable(Packet, (int)PacketSize);
var serverAddress = DhcpServerIpAddress.FromNative(IpAddress);
// ControlCode is ignored in this wrapper as:
// https://msdn.microsoft.com/en-us/library/windows/desktop/aa363294.aspx
// "The only acceptable value in this version of the DHCP Server API is DHCP_SEND_PACKET."
foreach (var consumer in Consumers)
{
if (consumer.SupportFlags.HasFlag(CalloutConsumerSupportFlags.PacketSend))
{
try
{
consumer.Proxy.PacketSend(packet, serverAddress, ref stopPropagation);
}
catch (Win32Exception ex)
{
return((uint)ex.NativeErrorCode);
}
catch (Exception)
{
return(0x1U); //ERROR_INVALID_FUNCTION
}
// stop propagation if instructed
if (stopPropagation)
{
break;
}
}
}
// write packet
if (packet.BufferModified)
{
packet.WriteBuffer(Packet, ref PacketSize);
}
// chain
if (!stopPropagation && ChainTable.DhcpPktSendHook != null)
{
return(ChainTable.DhcpPktSendHook(ref Packet, ref PacketSize, ControlCode, IpAddress, Reserved, PktContext));
}
return(ERROR_SUCCESS);
}
private static uint HandleNewPktHook(ref IntPtr Packet, ref uint PacketSize, uint IpAddress, IntPtr Reserved, IntPtr PktContext, out bool ProcessIt)
{
ProcessIt = true;
var stopPropagation = false;
var packet = new DhcpServerPacketWritable(Packet, (int)PacketSize);
var serverAddress = DhcpServerIpAddress.FromNative(IpAddress);
foreach (var consumer in Consumers)
{
if (consumer.SupportFlags.HasFlag(CalloutConsumerSupportFlags.NewPacket))
{
try
{
consumer.Proxy.NewPacket(packet, serverAddress, ref ProcessIt, ref stopPropagation);
}
catch (Win32Exception ex)
{
return((uint)ex.NativeErrorCode);
}
catch (Exception)
{
return(0x1U); //ERROR_INVALID_FUNCTION
}
// stop propagation if instructed or the packet is not to be processed
if (stopPropagation || !ProcessIt)
{
break;
}
}
}
// write packet
if (ProcessIt && packet.BufferModified)
{
packet.WriteBuffer(Packet, ref PacketSize);
}
// chain
if (ProcessIt && !stopPropagation && ChainTable.DhcpNewPktHook != null)
{
return(ChainTable.DhcpNewPktHook(ref Packet, ref PacketSize, IpAddress, Reserved, PktContext, out ProcessIt));
}
return(ERROR_SUCCESS);
}
