// event handler for link status changes
static void nic_OnLinkChangedEvent(ENC28J60Driver sender, DateTime time, bool isUp)
{
Debug.WriteLine("Link is now " + (isUp ? "up :)" : "down :("));
if (isUp && (Adapter.IPAddress == null || !DhcpDisabled))
{
PollingTimer.Change(500, 10000); // Get DHCP addresses now that link is up
}
else if (isUp && Adapter.IPAddress != null && DhcpDisabled && Adapter.Gateway != null)
{
PollingTimer.Change(500, 10000); // Get Gateway when setup for static ip and link comes up
}
else if (!isUp && !DhcpDisabled)
{
// Link is down, so when it comes back up, if we were using DHCP, we want to renew the address.
AreRenewing = true;
PollingTimer.Change(500, 7000);
}
}
// event handler for new ethernet frame arrivals
static void nic_OnFrameArrived(ENC28J60Driver sender, byte[] frame, DateTime timeReceived)
{
//if (buf[0] == 0x01)
//{
// Debug.WriteLine("Probable Multicast Message Detected - " + buf.Length.ToString());
// if (buf[29] == 0x65) Debug.WriteLine("IP ending in 101");
//}
//if (buf[29] == 0x65)
//{
// Debug.WriteLine("IP ending in 101 - size: " + buf.Length.ToString());
// if (buf.Length == 541)
// Debug.WriteLine("What is this? ");
//}
//var packetID = Guid.NewGuid().ToString();
if (frame == null) return;
//Debug.WriteLine("Memory: " + Microsoft.SPOT.Debug.GC(false).ToString() + ", packetID = " + packetID + ", age = " + timeReceived.Subtract(DateTime.Now).Seconds + "s, size = " + frame.Length + ", addys = " + Utility.ExtractRangeFromArray(frame, 0, 14).ToAddress());
if (frame[13] == 0x06 && frame[12] == 0x08) // ARP Packet Type
{
if (IPAddress != null)
{
// If message request, and IP matches ours, we need to respond!
if (frame[41] == IPAddress[3] && frame[40] == IPAddress[2] && frame[39] == IPAddress[1] && frame[38] == IPAddress[0])
{
ARP.HandlePacket(frame);
}
else if (frame[21] == 0x02 && frame[31] == IPAddress[3] && frame[30] == IPAddress[2] && frame[29] == IPAddress[1] && frame[28] == IPAddress[0])
{
Debug.WriteLine("Possible IP Address Conflict Detected");
Adapter.Stop(); // IP Address Conflict!
//TODO: if DHCP is enabled, don't stop the networking! Just reset and get a new IP!!!!
}
}
}
else if (frame[13] == 0x00 && frame[12] == 0x08) // Handle IP packets
{
if (frame[23] == 0x01) // Protocol 1 -- PING
{
// Debug.WriteLine("Received ICMP (Ping) Packet -- " + frame.Length + " bytes");
ICMP.HandlePacket(frame);
}
else if (frame[23] == 0x11) // Protocol 17 -- UDP
{
if (frame[37] == 0x44 && !DhcpDisabled && frame[36] == 0x00) // DHCP port 68 -- Order of conditions to short-circuit earlier!
{
//Debug.WriteLine("Received DHCP Packet -- " + frame.Length + " bytes");
DHCP.HandlePacket(frame);
}
else if (frame[37] == 0x89 && frame[36] == 0x00 && Name != null && Name != string.Empty && IPAddress != null) // NetBIOS port 137 and name is set
{
//Debug.WriteLine("Received NBNS Packet -- " + frame.Length + " bytes");
// Uncomment the line below to enable Netbios over TCP Name resolution
NetBiosNaming.HandlePacket(frame);
}
else if (frame[35] == 0x35 && frame[34] == 0x00) // DNS Source Port of 53 (0x35h)
{
//Debug.WriteLine("Received DNS Packet -- " + frame.Length + " bytes");
DNS.HandlePacket(frame);
}
else if (frame[37] == 0xe9 && frame[36] == 0x14 && frame[35] == 0xe9 && frame[34] == 0x14 && Name != null && Name != string.Empty && IPAddress != null) // mDNS Source and Destination Port of 5353 or LLMNR Destination Port of 5355
{
//Debug.WriteLine("Received MDNS Packet -- " + frame.Length + " bytes");
MDNS.HandlePacket(frame);
}
else if (frame[37] == 0xeb && frame[36] == 0x14 && Name != null && Name != string.Empty && IPAddress != null)
{
// Debug.WriteLine("Received LLMNR Packet -- " + frame.Length + " bytes");
LLMNR.HandlePacket(frame);
}
else if (OnUdpReceivedPacketEvent != null && IPAddress != null) // Check Listening ports
{
//Debug.WriteLine("Received UDP Packet -- " + frame.Length + " bytes");
foreach (byte[] aPort in ListeningPorts.Values)
if (aPort[0] == frame[36] && aPort[1] == frame[37]) UDP.HandlePacket(frame);
}
}
else if (frame[23] == 0x06 && IPAddress != null) // Protocol 6 -- TCP
{
//Debug.WriteLine("Received TCP Packet -- " + frame.Length + " bytes");
foreach (byte[] aPort in ListeningPorts.Values)
{
if (aPort[0] == frame[36] && aPort[1] == frame[37])
{
TCP.HandlePacket(frame);
return;
}
}
// Handle a response from a currently open connection
ulong conID = TCP.GenerateConnectionID(frame);
if (TCP.Connections.Contains(conID))
TCP.HandlePacket(frame);
//else
//TODO: Send a RST as a response to a closed port.
//var port = (new byte[2] { frame[36], frame[37] }).ToShort();
//foreach (Connection aCon in TCP.Connections)
//{
// if (aCon.LocalPort == port)
// TCP.HandlePacket(frame);
// return;
//}
}
}
// All other packets are ignored... like throwing back a fish :)
//Debug.WriteLine("Memory: " + Microsoft.SPOT.Debug.GC(false).ToString() + ", packetID = " + packetID);
//Microsoft.SPOT.Debug.EnableGCMessages(true);
}
private static void MainService()
{
if (nic != null && nic is ENC28J60Driver) return;
nic = new ENC28J60Driver(Adapter.IntPin, Adapter.CSPin, Adapter.SpiPort);
// event handler for link status changes (i.e. up/down)
nic.OnLinkChangedEvent += new ENC28J60Driver.LinkChangedEventHandler(nic_OnLinkChangedEvent);
// event handler for incoming packet arrival
nic.OnFrameArrived += new ENC28J60Driver.FrameArrivedEventHandler(nic_OnFrameArrived);
// NOTE: Don't call any other functions until started
nic.Start(MacAddress);
//PollingTimer.Change(10000, 10000);
}