public void RequestAllocate()
{
if (++turnAllocateCount > 2)
{
return;
}
MessageSTUN message = CreateMessageSTUN(STUNMethod.AllocateRequest);
//message.WriteString(STUNAttribute.ServerName, "Coturn-4.5.1.1 'dan Eider'");
message.WriteString(STUNAttribute.Username, message.username);
message.WriteString(STUNAttribute.Realm, message.realm);
//message.WriteString(STUNAttribute.Password, message.password);
message.WriteUInt(STUNAttribute.Lifetime, lifeTime);
message.WriteEmpty(STUNAttribute.DontFragment);
message.WriteUInt(STUNAttribute.RequestedTransport, (uint)(17 << 24));//(uint)(17 << 24)
if (nonce != null)
{
message.WriteBytes(STUNAttribute.Nonce, nonce);
message.WriteRequestIntegrity();
}
byte[] pkg = message.WriteRequest();
sender.Send(pkg);
}
public string GetAttributeKeys(MessageSTUN message)
{
string attrKeys = "";
foreach (KeyValuePair <STUNAttribute, object> entry in message.response)
{
string key = Enum.GetName(typeof(STUNAttribute), entry.Key);
int id = (int)entry.Key;
if (attrKeys.Length > 0)
{
attrKeys += "\n";
}
object value = entry.Value;
string valueStr = "";
if (value is string v)
{
valueStr = v;
}
else if (value is byte[] b)
{
valueStr = NetworkSerializer.ByteArrayToHexString(b);
}
else
{
valueStr = value.ToString();
}
attrKeys += key + "(" + id.ToString("X") + ") = " + valueStr;
}
return(attrKeys);
}
private byte[] AddIndicationHeader(STUNAddress stunAddress, byte[] data)
{
// send indication
MessageSTUN message = CreateMessageSTUN(STUNMethod.DataIndication);
byte[] ret;
if (stunAddress.IsIPv4)
{
ret = new byte[8];
ret[1] = (byte)(0x01); // family
}
else
{
ret = new byte[16];
ret[1] = (byte)(0x02); // family
}
ret[0] = (byte)(0x0);
ret[3] = (byte)(stunAddress.port & 0xff);
ret[2] = (byte)((stunAddress.port >> 8) & 0xff);
ret[2] ^= transactionID[0];
ret[3] ^= transactionID[1];
for (int i = 0; i < stunAddress.address.Length; i++)
{
ret[4 + i] = (byte)(stunAddress.address[i] ^ transactionID[i]);
}
message.WriteBytes(STUNAttribute.XorPeerAddress, ret);
message.WriteEmpty(STUNAttribute.DontFragment);
message.WriteBytes(STUNAttribute.Data, data);
return(message.WriteRequest());
}
public void RequestChannelBind(STUNAddress stunAddress)
{
lock (_lock)
{
MessageSTUN message = CreateMessageSTUN(STUNMethod.ChannelBindRequest);
// channel number [0x4000 through 0x4FFF](uint)random.Next(0x4001, 0x4FFF);
uint channelNumber;
if (!ip2ChannelNumber.ContainsKey(stunAddress.ToString()))
{
GenerateChannelNumberForPeer(stunAddress);
}
channelNumber = ip2ChannelNumber[stunAddress.ToString()];
Console.WriteLine("RequestChannelBind: {0} {1}:{2}", channelNumber, stunAddress.ToString(), stunAddress.port);
channelNumber = (uint)(channelNumber << 16);
message.WriteString(STUNAttribute.Username, message.username);
message.WriteString(STUNAttribute.Realm, message.realm);
message.WriteUInt(STUNAttribute.ChannelNumber, channelNumber);
byte[] ret;
if (stunAddress.IsIPv4)
{
ret = new byte[8];
ret[1] = (byte)(0x01); // family
}
else
{
ret = new byte[16];
ret[1] = (byte)(0x02); // family
}
ret[0] = (byte)(0x0);
ret[3] = (byte)(stunAddress.port & 0xff);
ret[2] = (byte)((stunAddress.port >> 8) & 0xff);
ret[2] ^= transactionID[0];
ret[3] ^= transactionID[1];
for (int i = 0; i < stunAddress.address.Length; i++)
{
ret[4 + i] = (byte)(stunAddress.address[i] ^ transactionID[i]);
}
message.WriteBytes(STUNAttribute.XorPeerAddress, ret);
if (nonce != null)
{
message.WriteBytes(STUNAttribute.Nonce, nonce);
message.WriteRequestIntegrity();
}
byte[] pkg = message.WriteRequest();
sender.Send(pkg);
}
}
public virtual void OnAllocateResponse(MessageSTUN message)
{
lock (_lock)
{
ip2ChannelNumber.Clear();
channelNumber2Peer.Clear();
}
GenerateChannelNumberForAllPeers();
RequestRefreshAllBindingChannelLifeTime();
StartRefreshTimer();
StartCheckingConnectionTimer();
STUNAddress sa = (STUNAddress)message.Get(STUNAttribute.XorRelayedAddress);
//OnServerDataReceived?.BeginInvoke(this, new STUN_ServerDataReceivedEventArgs((int)responseChannelNumber, new ArraySegment<byte>(appData)), EndAsyncEvent, null);
OnAllocateResponseEvent?.Invoke(this, new NATP_SignalingEventArgs(true, "", new IPEndPoint(new IPAddress(sa.address), sa.port)));
}
public void RequestRefreshAllocationeLifeTime(uint lifetime)
{
MessageSTUN message = CreateMessageSTUN(STUNMethod.RefreshRequest);
message.WriteString(STUNAttribute.Username, message.username);
message.WriteString(STUNAttribute.Realm, message.realm);
message.WriteUInt(STUNAttribute.Lifetime, lifetime);
//message.WriteUInt(STUNAttribute.RequestedTransport, (uint)(17 << 24));
if (nonce != null)
{
message.WriteBytes(STUNAttribute.Nonce, nonce);
message.WriteRequestIntegrity();
}
byte[] pkg = message.WriteRequest();
sender.Send(pkg);
}
public void RequestCreatePermission(STUNAddress stunAddress)
{
lock (_lock)
{
MessageSTUN message = CreateMessageSTUN(STUNMethod.CreatePermissionRequest);
message.WriteString(STUNAttribute.Username, message.username);
message.WriteString(STUNAttribute.Realm, message.realm);
byte[] ret;
if (stunAddress.IsIPv4)
{
ret = new byte[8];
ret[1] = (byte)(0x01); // family
}
else
{
ret = new byte[16];
ret[1] = (byte)(0x02); // family
}
ret[0] = (byte)(0x0);
ushort xorFlag16 = (ushort)(magicCookie >> 16);
ret[3] = 0;
ret[2] = 0;
ret[2] ^= transactionID[0];
ret[3] ^= transactionID[1];
for (int i = 0; i < stunAddress.address.Length; i++)
{
ret[4 + i] = (byte)(stunAddress.address[i] ^ transactionID[i]);
}
message.WriteBytes(STUNAttribute.XorPeerAddress, ret);
if (nonce != null)
{
message.WriteBytes(STUNAttribute.Nonce, nonce);
message.WriteRequestIntegrity();
}
byte[] pkg = message.WriteRequest();
sender.Send(pkg);
}
}
public virtual void OnChannelBindError(MessageSTUN message)
{
Start();
}
public virtual void OnAllocateError(MessageSTUN message)
{
RequestAllocate();
}
public virtual void OnCreatePermissionResponse(MessageSTUN message)
{
}
public virtual void OnRefreshErrorResponse(MessageSTUN message)
{
RequestRefreshAllocationeLifeTime(this.lifeTime);
RequestRefreshAllBindingChannelLifeTime();
StartRefreshTimer();
}
public virtual void OnRefreshResponse(MessageSTUN message)
{
OnRefreshLifeTimeResponseEvent?.Invoke();
}
public virtual void OnChannelBindResponse(MessageSTUN message)
{
}
public virtual void OnBindingResponse(MessageSTUN message)
{
}
public virtual void OnResponse(byte[] buffer, long offset, long size)
{
byte[] appData;
MessageSTUN message = new MessageSTUN(buffer, offset, size, out appData);
if (!message.IsSTUNMessage) // Normal Data Received
{
string ip;
uint responseChannelNumber;
if (message.isIndicateData) // sender's ip and channel bind's ip are same, but port are different, so stun server send indicate data
{
if (!autoUpdatePort)
{
// deal with it
return;
}
if (ChannelNumberMode)
{
AddPeer(message.indicateAddress);
RequestChannelBind(message.indicateAddress);
return;
}
else
{
ip = message.indicateAddress.ToString();
if (!ip2ChannelNumber.ContainsKey(ip))
{
AddPeer(message.indicateAddress);
return;
}
}
responseChannelNumber = ip2ChannelNumber[ip];
}
else
{
responseChannelNumber = message.responseChannelNumber;
}
if (IsClientHeartbeat(appData))
{
SendHeartBeatToClient(responseChannelNumber);
}
else if (IsClientDisconnectHeartbeat(appData))
{
lock (_lockHeartbeat)
{
peerHeartbeat.Remove(responseChannelNumber);
}
DisconnectClient(responseChannelNumber);
}
else
{
OnServerDataReceived?.Invoke(this, new NATP_STUN_ServerDataReceivedEventArgs((int)responseChannelNumber, new ArraySegment <byte>(appData)));
//OnServerDataReceived?.BeginInvoke(this, new STUN_ServerDataReceivedEventArgs((int)responseChannelNumber, new ArraySegment<byte>(appData)), EndAsyncEvent, null);
}
}
else // Is STUN Server response
{
var newNonce = (byte[])message.Get(STUNAttribute.Nonce);
if (newNonce != null)
{
nonce = newNonce;
}
switch (message.method)
{
case STUNMethod.AllocateResponse:
OnAllocateResponse(message);
break;
case STUNMethod.BindingResponse:
OnBindingResponse(message);
break;
case STUNMethod.ChannelBindError:
OnChannelBindError(message);
break;
case STUNMethod.ChannelBindResponse:
OnChannelBindResponse(message);
break;
case STUNMethod.AllocateError:
OnAllocateError(message);
break;
case STUNMethod.RefreshResponse:
OnRefreshResponse(message);
break;
case STUNMethod.RefereshError:
OnRefreshErrorResponse(message);
break;
case STUNMethod.CreatePermissionResponse:
OnCreatePermissionResponse(message);
break;
}
}
}
