private static void SendMDNSNameReply()
{
if (Adapter.IPAddress == null || Networking.Adapter.Name == string.Empty)
{
return;
}
prefix.Overwrite(0, new byte[6] {
0x01, 0x00, 0x5e, 0x00, 0x00, 0xfb
});
prefix.Overwrite(6, Adapter.MacAddress); // Source MAC Address
prefix.Overwrite(26, Adapter.IPAddress); // Source IP Address
lock (lockObj)
{
// Set the all-important name and IP address -- that's the whole purpose here...!
suffix.Overwrite(10, Adapter.IPAddress);
var result = Utility.CombineArrays(prefix, Utility.CombineArrays(DNS.EncodeDnsName(Networking.Adapter.Name + ".local"), suffix));
result.Overwrite(16, ((ushort)(result.Length - 14)).ToBytes()); // Set IPv4 message size
result.Overwrite(38, ((ushort)(result.Length - 34)).ToBytes()); // Set UDP message size
result.Overwrite(24, new byte[] { 0x00, 0x00 }); // clear header checksum, so that calc excludes the checksum itself
result.Overwrite(24, result.InternetChecksum(20, 14)); // header checksum
result.Overwrite(40, new byte[] { 0x00, 0x00 }); // clear UDP Checksum
Debug.WriteLine("Sending MDNS name message! ");
Adapter.nic.SendFrame(result); // Send the packet out into the ether....!
}
}
/// <summary>
/// Take care of a packet of Multicast DNS stuff
/// </summary>
/// <param name="payload"></param>
internal static void HandlePacket(byte[] payload)
{
ushort ipHeaderLength = (ushort)((payload[14] & 0x0f) * 4);
var name = DNS.DecodeDnsName(payload, 34 + ipHeaderLength); // Name from first Query
if (Adapter.VerboseDebugging)
{
Debug.WriteLine("Local Name Request (MDNS) for " + name);
}
bool isQuery = (payload[24 + ipHeaderLength] & (1 << 7)) == 0; // DNS Query ?
if (!isQuery)
{
return;
}
// Validate that this is MDNS address 224.0.0.251
if (payload[10 + ipHeaderLength] != 0xe0 || payload[11 + ipHeaderLength] != 0x00 || payload[12 + ipHeaderLength] != 0x00 || payload[13 + ipHeaderLength] != 0xfb)
{
return;
}
if (name != Networking.Adapter.Name + ".local")
{
return; // if the name requested does not match ours, exit!
}
// Wow, if we made it past all that, we should send a reply...
SendMDNSNameReply();
}
/// <summary>
/// A synchronous call to send an HTTP Request and Receive a Response -- this call will block (until the timeout) while trying to get the result
/// </summary>
/// <param name="timeout">Time out in seconds</param>
/// <param name="RetrieveHeaderOnly">Set this to true if you don't need the content of the response (which can consume a lot of memory)</param>
/// <returns>And HttpResponse object OR a null if it timeout happened</returns>
public HttpResponse Send(ushort timeout = 5, bool ReturnHeaderOnly = false)
{
this.omitContent = ReturnHeaderOnly;
// if _con is null, create and open a new connection. with a DNS lookup of host if necessary
if (_con == null)
{
var remoteIp = DNS.Lookup(Host);
_con = new Connection()
{
RemoteIP = remoteIp
};
}
var r = AssembleRequest();
_responseToSend = null;
_con.OnConnectionPacketReceived += _con_OnConnectionPacketReceived;
responseWaitHandle.Reset(); // This will release an Open() call waiting for the connection!
_con.SendAsync(r, 0, (short)r.Length);
//Wait for response or timeout
responseWaitHandle.WaitOne(timeout * 1000, true);
_con.OnConnectionPacketReceived -= _con_OnConnectionPacketReceived;
return(_responseToSend);
}
public void SendAsync()
{
// if _con is null, create and open a new connection. with a DNS lookup of host if necessary
if (_con == null)
{
var remoteIp = DNS.Lookup(Host);
_con = new Connection()
{
RemoteIP = remoteIp
};
}
var r = AssembleRequest();
_con.SendAsync(r, 0, (short)r.Length);
}
/// <summary>
///
/// </summary>
private static void SendLLMNRNameReply(string name, byte[] tranID, byte[] destinationMac, byte[] destinationIP, byte[] destinationPort)
{
if (Adapter.IPAddress == null || Networking.Adapter.Name == string.Empty)
{
return;
}
lock (lockObj)
{
prefix.Overwrite(0, destinationMac);
prefix.Overwrite(6, Adapter.MacAddress); // Source MAC Address
prefix.Overwrite(26, Adapter.IPAddress); // Source IP Address
prefix.Overwrite(30, destinationIP);
prefix.Overwrite(36, destinationPort);
prefix.Overwrite(42, tranID);
var suffix = new byte[name.Length * 2 + 22];
var byteName = Utility.CombineArrays(DNS.EncodeDnsName(name), new byte[4] {
0x00, 0x01, 0x00, 0x01
});
suffix.Overwrite(0, Utility.CombineArrays(byteName, byteName));
suffix.Overwrite(suffix.Length - 7, new byte[1] {
0x1e
}); // Time To Live (30 seconds)
suffix.Overwrite(suffix.Length - 5, new byte[1] {
0x04
}); // IP Address length
suffix.Overwrite(suffix.Length - 4, Adapter.IPAddress);
var result = Utility.CombineArrays(prefix, suffix);
result.Overwrite(16, ((ushort)(result.Length - 14)).ToBytes()); // Set IPv4 message size
result.Overwrite(38, ((ushort)(result.Length - 34)).ToBytes()); // Set UDP message size
result.Overwrite(24, new byte[] { 0x00, 0x00 }); // clear header checksum, so that calc excludes the checksum itself
result.Overwrite(24, result.InternetChecksum(20, 14)); // header checksum
result.Overwrite(40, new byte[] { 0x00, 0x00 }); // clear UDP Checksum
Adapter.nic.SendFrame(result); // Send the packet out into the ether....!
Debug.WriteLine("LLMNR Response sent");
}
}
/// <summary>
/// Take care of a packet of Linked-Local Multicast Name Resolution (LLMNR) stuff
/// </summary>
/// <param name="payload"></param>
internal static void HandlePacket(byte[] payload)
{
ushort ipHeaderLength = (ushort)((payload[14] & 0x0f) * 4);
var name = DNS.DecodeDnsName(payload, 34 + ipHeaderLength); // Name from first Query
bool isQuery = (payload[24 + ipHeaderLength] & (1 << 7)) == 0; // DNS Query ?
if (!isQuery)
{
return;
}
// This is not a good or valid way to detect the type because there could be multiple answers, but I have bigger fish to fry...
bool isTypeA = payload[payload.Length - 3] == 0x01;
if (!isTypeA)
{
return;
}
// Validate that this is an LLMNR address 224.0.0.252
if (payload[10 + ipHeaderLength] != 0xe0 || payload[11 + ipHeaderLength] != 0x00 || payload[12 + ipHeaderLength] != 0x00 || payload[13 + ipHeaderLength] != 0xfc)
{
return;
}
//Debug.WriteLine("Local Name Request (LLMNR, Type A) for " + name);
if (name != Networking.Adapter.Name + ".local" && name != Networking.Adapter.Name)
{
return; // if the name requested does not match ours, exit!
}
if (Adapter.VerboseDebugging)
{
Debug.WriteLine("Local Name Request (LLMNR, Type A) for " + name);
}
SendLLMNRNameReply(name, Utility.ExtractRangeFromArray(payload, 42, 2), Utility.ExtractRangeFromArray(payload, 6, 6), Utility.ExtractRangeFromArray(payload, 26, 4), Utility.ExtractRangeFromArray(payload, 34, 2));
}
// 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);
}
/// <summary>
/// Seperate send method to share a lock so that we don't mix up packets...
/// </summary>
/// <param name="packetType"></param>
internal static void SendMessage(byte[] packetType)
{
lock (MagicCookie)
{
scratch.Overwrite(0, Adapter.BroadcastMAC); // Destination MAC Address
scratch.Overwrite(6, Adapter.MacAddress); // Source MAC Address
scratch.Overwrite(30, Adapter.BroadcastIPAddress); // Destiantion IP Address
scratch.Overwrite(54, Adapter.BlankIPAddress); // Source IP Address
scratch.Overwrite(70, Adapter.MacAddress); // Source MAC Address Again inside the DHCP section
scratch.Overwrite(284, packetType);
byte[] options = new byte[13 + (Adapter.Name == string.Empty ? 0 : Adapter.Name.Length + 2)];
options.Overwrite(0, Adapter.MacAddress);
transactionID = transactionID ?? Extensions.GetRandomBytes(4); // Make up some transaction ID
if (packetType == DHCP.Discover)
{
// Debug.WriteLine("Composing Discover Message");
PendingIpAddress = null;
//scratch.Overwrite(306, suffix); // write the Discover suffix
options.Overwrite(6, new byte[6] {
0x33, 0x04, 0x00, 0x76, 0xa7, 0x00
}); // Request an IP lease time of 90 days
}
else if (packetType == DHCP.Request && PendingIpAddress != null && Adapter.Gateway != null)
{
//Debug.WriteLine("Composing Request Message");
options.Overwrite(6, new byte[2] {
0x32, 0x04
}); // Set the option prefix for IP Address
options.Overwrite(8, PendingIpAddress); // Set the option Value
options.Overwrite(12, new byte[2] {
0x36, 0x04
}); // Set the option prefix for Gateway
options.Overwrite(14, Adapter.Gateway); // Set the option value
if (Adapter.GatewayMac != null && Adapter.Gateway != null && Adapter.IPAddress != null)
{
// This is for the renewals
//TODO: Test to make sure this works!
//scratch.Overwrite(0, Adapter.GatewayMac);
//scratch.Overwrite(30, Adapter.Gateway);
scratch.Overwrite(54, Adapter.IPAddress);
}
}
else
{
Debug.WriteLine("Odd DHCP situation... should we be concerned?");
return;
}
if (Adapter.Name != string.Empty)
{
// Add Hostname option to Discover and Request messages
options.Overwrite(options.Length - (Adapter.Name.Length + 3), new byte[1] {
0x0c
});
options.Overwrite(options.Length - (Adapter.Name.Length + 2), DNS.EncodeDnsName(Adapter.Name));
}
options.Overwrite(options.Length - 1, new byte[1] {
0xFF
}); // End of option section marker
scratch.Overwrite(46, transactionID); // Write the transaction ID
var result = Utility.CombineArrays(scratch, options);
result.Overwrite(16, ((ushort)(result.Length - 14)).ToBytes()); // Set IPv4 message size
result.Overwrite(38, ((ushort)(result.Length - 34)).ToBytes()); // Set UDP message size
result.Overwrite(24, new byte[] { 0x00, 0x00 }); // clear header checksum, so that calc excludes the checksum itself
result.Overwrite(24, result.InternetChecksum(20, 14)); // header checksum
result.Overwrite(40, new byte[] { 0x00, 0x00 }); // clear UDP Checksum
Adapter.nic.SendFrame(result); // Send the packet out into the ether....!
}
}
