public void TellRemoteEndToUseThisPair(RTPStream stream, string strUsername, string strPassword)
{
if (IsControlling == false)
{
throw new Exception("Only controlling endpoint can send a usecandidate attribute");
}
STUN2Message msgRequest = new STUN2Message();
msgRequest.Method = StunMethod.Binding;
msgRequest.Class = StunClass.Request;
PriorityAttribute pattr = new PriorityAttribute();
pattr.Priority = (int)CalculatePriority(110, 30, this.LocalCandidate.component); ///Peer reflexive, not sure of the purpose of this yet //this.Priority;
msgRequest.AddAttribute(pattr);
IceControllingAttribute cattr = new IceControllingAttribute();
msgRequest.AddAttribute(cattr);
UseCandidateAttribute uattr = new UseCandidateAttribute();
msgRequest.AddAttribute(uattr);
if (strUsername != null)
{
UserNameAttribute unameattr = new UserNameAttribute();
unameattr.UserName = strUsername;
msgRequest.AddAttribute(unameattr);
}
/// Add message integrity, computes over all the items currently added
///
int nLengthWithoutMessageIntegrity = msgRequest.Bytes.Length;
MessageIntegrityAttribute mac = new MessageIntegrityAttribute();
msgRequest.AddAttribute(mac);
mac.ComputeHMACShortTermCredentials(msgRequest, nLengthWithoutMessageIntegrity, strPassword);
/// Add fingerprint
///
int nLengthWithoutFingerPrint = msgRequest.Bytes.Length;
FingerPrintAttribute fattr = new FingerPrintAttribute();
msgRequest.AddAttribute(fattr);
fattr.ComputeCRC(msgRequest, nLengthWithoutFingerPrint);
foreach (int nNextTimeout in Timeouts)
{
STUNMessage ResponseMessage = stream.SendRecvSTUN(this.RemoteCandidate.IPEndPoint, msgRequest, nNextTimeout);
if (ResponseMessage != null)
{
break;
}
}
}
public void SendIndicationGoogle(RTPStream stream, string strUsername)
{
/// Google talk appears to send a full stun binding request every 500 ms instead of a binding indication
STUN2Message msgRequest = new STUN2Message();
msgRequest.Method = StunMethod.Binding;
msgRequest.Class = StunClass.Request;
if (strUsername != null)
{
UserNameAttribute unameattr = new UserNameAttribute();
unameattr.UserName = strUsername;
msgRequest.AddAttribute(unameattr);
}
STUNMessage ResponseMessage = stream.SendRecvSTUN(this.RemoteCandidate.IPEndPoint, msgRequest, 0);
}
public void SendIndication(RTPStream stream)
{
/// Need to send a binding indication every 3 s from now on?
STUN2Message msgBindingIndication = new STUN2Message();
msgBindingIndication.Method = StunMethod.Binding;
msgBindingIndication.Class = StunClass.Inidication;
/// Add fingerprint
///
int nLengthWithoutFingerPrint = msgBindingIndication.Bytes.Length;
FingerPrintAttribute fattr = new FingerPrintAttribute();
msgBindingIndication.AddAttribute(fattr);
fattr.ComputeCRC(msgBindingIndication, nLengthWithoutFingerPrint);
stream.SendRecvSTUN(this.RemoteCandidate.IPEndPoint, msgBindingIndication, 0);
}
public string CreateAndSendSTUN(DnsEndPoint serverEp)
{
STUN2Message msgRequest = new STUN2Message();
msgRequest.Method = StunMethod.Binding;
msgRequest.Class = StunClass.Request;
MappedAddressAttribute mattr = new MappedAddressAttribute();
mattr.IPAddress = LocalEndpoint.Address;
mattr.Port = (ushort)LocalEndpoint.Port;
msgRequest.AddAttribute(mattr);
byte[] tosend = msgRequest.Bytes;
return(RTPUDPClient.SendByteArray(tosend, serverEp));
}
void RTPUDPClient_OnReceiveMessage(byte[] bData, int nLength, IPEndPoint epfrom, IPEndPoint epthis, DateTime dtReceived)
{
/// if we are an performing ICE, see if this is an ICE packet instead of an RTP one
if (nLength >= 8)
{
//0x2112A442
if ((bData[4] == 0x21) && (bData[5] == 0x12) && (bData[6] == 0xA4) && (bData[7] == 0x42))
{
/// STUN message
STUN2Message smsg = new STUN2Message();
byte[] bStun = new byte[nLength];
Array.Copy(bData, 0, bStun, 0, nLength);
smsg.Bytes = bStun;
STUNRequestResponse foundreq = null;
lock (StunLock)
{
foreach (STUNRequestResponse queuedreq in StunRequestResponses)
{
if (queuedreq.IsThisYourResponseSetIfItIs(smsg) == true)
{
foundreq = queuedreq;
break;
}
}
if (foundreq != null)
{
StunRequestResponses.Remove(foundreq);
return;
}
}
if (OnUnhandleSTUNMessage != null)
{
OnUnhandleSTUNMessage(smsg, epfrom);
}
return;
}
}
/// TODO... handle RTCP packets if we ever care to
}
public void PerformOutgoingSTUNCheckGoogle(RTPStream stream, string strUsername, string strPassword)
{
STUN2Message msgRequest = new STUN2Message();
msgRequest.Method = StunMethod.Binding;
msgRequest.Class = StunClass.Request;
if (strUsername != null)
{
UserNameAttribute unameattr = new UserNameAttribute();
unameattr.UserName = strUsername;
msgRequest.AddAttribute(unameattr);
}
foreach (int nNextTimeout in Timeouts)
{
STUNMessage ResponseMessage = stream.SendRecvSTUN(this.RemoteCandidate.IPEndPoint, msgRequest, nNextTimeout);
ResponseEndpoint = null;
if (ResponseMessage != null)
{
foreach (STUNAttributeContainer cont in ResponseMessage.Attributes)
{
if (cont.ParsedAttribute.Type == StunAttributeType.MappedAddress)
{
MappedAddressAttribute attrib = cont.ParsedAttribute as MappedAddressAttribute;
ResponseEndpoint = new IPEndPoint(attrib.IPAddress, attrib.Port);
}
}
this.CandidatePairState = RTP.CandidatePairState.Succeeded;
break;
}
else
{
this.CandidatePairState = RTP.CandidatePairState.Failed;
}
}
}
public STUNMessage SendRecvSTUN1(EndPoint epStun, STUN2Message msgRequest, int nTimeout)
{
STUNRequestResponse req = new STUNRequestResponse(msgRequest);
lock (StunLock)
{
StunRequestResponses.Add(req);
}
SendSTUNMessage(msgRequest, epStun);
bool bResponse = req.WaitForResponse(nTimeout);
lock (StunLock)
{
if (StunRequestResponses.Contains(req) == true)
{
StunRequestResponses.Remove(req);
}
}
return(req.ResponseMessage);
}
public void PerformOutgoingSTUNCheck(RTPStream stream, string strUsername, string strPassword)
{
STUN2Message msgRequest = new STUN2Message();
msgRequest.Method = StunMethod.Binding;
msgRequest.Class = StunClass.Request;
//MappedAddressAttribute mattr = new MappedAddressAttribute();
//mattr.IPAddress = LocalCandidate.IPEndPoint.Address;
//mattr.Port = (ushort)LocalCandidate.IPEndPoint.Port;
//msgRequest.AddAttribute(mattr);
PriorityAttribute pattr = new PriorityAttribute();
pattr.Priority = (int)CalculatePriority(110, 10, this.LocalCandidate.component); ///Peer reflexive, not sure of the purpose of this yet //this.Priority;
msgRequest.AddAttribute(pattr);
if (IsControlling == true)
{
IceControllingAttribute cattr = new IceControllingAttribute();
msgRequest.AddAttribute(cattr);
}
else
{
IceControlledAttribute cattr = new IceControlledAttribute();
msgRequest.AddAttribute(cattr);
}
if (strUsername != null)
{
UserNameAttribute unameattr = new UserNameAttribute();
unameattr.UserName = strUsername;
msgRequest.AddAttribute(unameattr);
}
/// Add message integrity, computes over all the items currently added
///
int nLengthWithoutMessageIntegrity = msgRequest.Bytes.Length;
MessageIntegrityAttribute mac = new MessageIntegrityAttribute();
msgRequest.AddAttribute(mac);
mac.ComputeHMACShortTermCredentials(msgRequest, nLengthWithoutMessageIntegrity, strPassword);
/// Add fingerprint
///
int nLengthWithoutFingerPrint = msgRequest.Bytes.Length;
FingerPrintAttribute fattr = new FingerPrintAttribute();
msgRequest.AddAttribute(fattr);
fattr.ComputeCRC(msgRequest, nLengthWithoutFingerPrint);
foreach (int nNextTimeout in Timeouts)
{
STUNMessage ResponseMessage = stream.SendRecvSTUN(this.RemoteCandidate.IPEndPoint, msgRequest, nNextTimeout);
ResponseEndpoint = null;
if (ResponseMessage != null)
{
foreach (STUNAttributeContainer cont in ResponseMessage.Attributes)
{
if (cont.ParsedAttribute.Type == StunAttributeType.MappedAddress)
{
MappedAddressAttribute attrib = cont.ParsedAttribute as MappedAddressAttribute;
ResponseEndpoint = new IPEndPoint(attrib.IPAddress, attrib.Port);
}
}
System.Diagnostics.Debug.WriteLine("STUN check for remote candidate {0} succeeded", this.RemoteCandidate.IPEndPoint);
this.CandidatePairState = RTP.CandidatePairState.Succeeded;
break;
}
else
{
System.Diagnostics.Debug.WriteLine("STUN check for remote candidate {0} failed", this.RemoteCandidate.IPEndPoint);
this.CandidatePairState = RTP.CandidatePairState.Failed;
}
}
}
public string CreateAndSendSTUN(DnsEndPoint serverEp)
{
STUN2Message msgRequest = new STUN2Message();
msgRequest.Method = StunMethod.Binding;
msgRequest.Class = StunClass.Request;
MappedAddressAttribute mattr = new MappedAddressAttribute();
mattr.IPAddress = LocalEndpoint.Address;
mattr.Port = (ushort)LocalEndpoint.Port;
msgRequest.AddAttribute(mattr);
byte[] tosend = msgRequest.Bytes;
return RTPUDPClient.SendByteArray(tosend, serverEp);
}
public void TellRemoteEndToUseThisPair(RTPStream stream, string strUsername, string strPassword)
{
if (IsControlling == false)
throw new Exception("Only controlling endpoint can send a usecandidate attribute");
STUN2Message msgRequest = new STUN2Message();
msgRequest.Method = StunMethod.Binding;
msgRequest.Class = StunClass.Request;
PriorityAttribute pattr = new PriorityAttribute();
pattr.Priority = (int)CalculatePriority(110, 30, this.LocalCandidate.component); ///Peer reflexive, not sure of the purpose of this yet //this.Priority;
msgRequest.AddAttribute(pattr);
IceControllingAttribute cattr = new IceControllingAttribute();
msgRequest.AddAttribute(cattr);
UseCandidateAttribute uattr = new UseCandidateAttribute();
msgRequest.AddAttribute(uattr);
if (strUsername != null)
{
UserNameAttribute unameattr = new UserNameAttribute();
unameattr.UserName = strUsername;
msgRequest.AddAttribute(unameattr);
}
/// Add message integrity, computes over all the items currently added
///
int nLengthWithoutMessageIntegrity = msgRequest.Bytes.Length;
MessageIntegrityAttribute mac = new MessageIntegrityAttribute();
msgRequest.AddAttribute(mac);
mac.ComputeHMACShortTermCredentials(msgRequest, nLengthWithoutMessageIntegrity, strPassword);
/// Add fingerprint
///
int nLengthWithoutFingerPrint = msgRequest.Bytes.Length;
FingerPrintAttribute fattr = new FingerPrintAttribute();
msgRequest.AddAttribute(fattr);
fattr.ComputeCRC(msgRequest, nLengthWithoutFingerPrint);
foreach (int nNextTimeout in Timeouts)
{
STUNMessage ResponseMessage = stream.SendRecvSTUN(this.RemoteCandidate.IPEndPoint, msgRequest, nNextTimeout);
if (ResponseMessage != null)
break;
}
}
public void SendIndicationGoogle(RTPStream stream, string strUsername)
{
/// Google talk appears to send a full stun binding request every 500 ms instead of a binding indication
STUN2Message msgRequest = new STUN2Message();
msgRequest.Method = StunMethod.Binding;
msgRequest.Class = StunClass.Request;
if (strUsername != null)
{
UserNameAttribute unameattr = new UserNameAttribute();
unameattr.UserName = strUsername;
msgRequest.AddAttribute(unameattr);
}
STUNMessage ResponseMessage = stream.SendRecvSTUN(this.RemoteCandidate.IPEndPoint, msgRequest, 0);
}
public void SendIndication(RTPStream stream)
{
/// Need to send a binding indication every 3 s from now on?
STUN2Message msgBindingIndication = new STUN2Message();
msgBindingIndication.Method = StunMethod.Binding;
msgBindingIndication.Class = StunClass.Inidication;
/// Add fingerprint
///
int nLengthWithoutFingerPrint = msgBindingIndication.Bytes.Length;
FingerPrintAttribute fattr = new FingerPrintAttribute();
msgBindingIndication.AddAttribute(fattr);
fattr.ComputeCRC(msgBindingIndication, nLengthWithoutFingerPrint);
stream.SendRecvSTUN(this.RemoteCandidate.IPEndPoint, msgBindingIndication, 0);
}
public void PerformOutgoingSTUNCheckGoogle(RTPStream stream, string strUsername, string strPassword)
{
STUN2Message msgRequest = new STUN2Message();
msgRequest.Method = StunMethod.Binding;
msgRequest.Class = StunClass.Request;
if (strUsername != null)
{
UserNameAttribute unameattr = new UserNameAttribute();
unameattr.UserName = strUsername;
msgRequest.AddAttribute(unameattr);
}
foreach (int nNextTimeout in Timeouts)
{
STUNMessage ResponseMessage = stream.SendRecvSTUN(this.RemoteCandidate.IPEndPoint, msgRequest, nNextTimeout);
ResponseEndpoint = null;
if (ResponseMessage != null)
{
foreach (STUNAttributeContainer cont in ResponseMessage.Attributes)
{
if (cont.ParsedAttribute.Type == StunAttributeType.MappedAddress)
{
MappedAddressAttribute attrib = cont.ParsedAttribute as MappedAddressAttribute;
ResponseEndpoint = new IPEndPoint(attrib.IPAddress, attrib.Port);
}
}
this.CandidatePairState = RTP.CandidatePairState.Succeeded;
break;
}
else
{
this.CandidatePairState = RTP.CandidatePairState.Failed;
}
}
}
public void PerformOutgoingSTUNCheck(RTPStream stream, string strUsername, string strPassword)
{
STUN2Message msgRequest = new STUN2Message();
msgRequest.Method = StunMethod.Binding;
msgRequest.Class = StunClass.Request;
//MappedAddressAttribute mattr = new MappedAddressAttribute();
//mattr.IPAddress = LocalCandidate.IPEndPoint.Address;
//mattr.Port = (ushort)LocalCandidate.IPEndPoint.Port;
//msgRequest.AddAttribute(mattr);
PriorityAttribute pattr = new PriorityAttribute();
pattr.Priority = (int) CalculatePriority(110, 10, this.LocalCandidate.component); ///Peer reflexive, not sure of the purpose of this yet //this.Priority;
msgRequest.AddAttribute(pattr);
if (IsControlling == true)
{
IceControllingAttribute cattr = new IceControllingAttribute();
msgRequest.AddAttribute(cattr);
}
else
{
IceControlledAttribute cattr = new IceControlledAttribute();
msgRequest.AddAttribute(cattr);
}
if (strUsername != null)
{
UserNameAttribute unameattr = new UserNameAttribute();
unameattr.UserName = strUsername;
msgRequest.AddAttribute(unameattr);
}
/// Add message integrity, computes over all the items currently added
///
int nLengthWithoutMessageIntegrity = msgRequest.Bytes.Length;
MessageIntegrityAttribute mac = new MessageIntegrityAttribute();
msgRequest.AddAttribute(mac);
mac.ComputeHMACShortTermCredentials(msgRequest, nLengthWithoutMessageIntegrity, strPassword);
/// Add fingerprint
///
int nLengthWithoutFingerPrint = msgRequest.Bytes.Length;
FingerPrintAttribute fattr = new FingerPrintAttribute();
msgRequest.AddAttribute(fattr);
fattr.ComputeCRC(msgRequest, nLengthWithoutFingerPrint);
foreach (int nNextTimeout in Timeouts)
{
STUNMessage ResponseMessage = stream.SendRecvSTUN(this.RemoteCandidate.IPEndPoint, msgRequest, nNextTimeout);
ResponseEndpoint = null;
if (ResponseMessage != null)
{
foreach (STUNAttributeContainer cont in ResponseMessage.Attributes)
{
if (cont.ParsedAttribute.Type == StunAttributeType.MappedAddress)
{
MappedAddressAttribute attrib = cont.ParsedAttribute as MappedAddressAttribute;
ResponseEndpoint = new IPEndPoint(attrib.IPAddress, attrib.Port);
}
}
System.Diagnostics.Debug.WriteLine("STUN check for remote candidate {0} succeeded", this.RemoteCandidate.IPEndPoint);
this.CandidatePairState = RTP.CandidatePairState.Succeeded;
break;
}
else
{
System.Diagnostics.Debug.WriteLine("STUN check for remote candidate {0} failed", this.RemoteCandidate.IPEndPoint);
this.CandidatePairState = RTP.CandidatePairState.Failed;
}
}
}
void RTPUDPClient_OnReceiveMessage(byte[] bData, int nLength, IPEndPoint epfrom, IPEndPoint epthis, DateTime dtReceived)
{
/// if we are an performing ICE, see if this is an ICE packet instead of an RTP one
if (nLength >= 8)
{
//0x2112A442
if ((bData[4] == 0x21) && (bData[5] == 0x12) && (bData[6] == 0xA4) && (bData[7] == 0x42))
{
/// STUN message
STUNMessage smsg = new STUN2Message();
byte[] bStun = new byte[nLength];
Array.Copy(bData, 0, bStun, 0, nLength);
try
{
smsg.Bytes = bStun;
}
catch (Exception ex)
{
smsg = new STUNMessage();
smsg.Bytes = bStun;
}
STUNRequestResponse foundreq = null;
lock (StunLock)
{
foreach (STUNRequestResponse queuedreq in StunRequestResponses)
{
if (queuedreq.IsThisYourResponseSetIfItIs(smsg) == true)
{
foundreq = queuedreq;
break;
}
}
if (foundreq != null)
{
StunRequestResponses.Remove(foundreq);
return;
}
}
if (OnUnhandleSTUNMessage != null)
{
OnUnhandleSTUNMessage(smsg, epfrom);
}
return;
}
}
RTPPacket packet = RTPPacket.BuildPacket(bData, 0, nLength);
if (packet != null) /// Seems we get some TURN channel data messages from google talk
{
if (ReceiveSSRC == 0)
{
ReceiveSSRC = packet.SSRC;
}
if ((packet.PayloadType == this.Payload) && (packet.SSRC == this.ReceiveSSRC))
{
IncomingRTPPacketBuffer.AddPacket(packet);
}
}
}
