async Task <P2PSettings> MatchingRequest(string url, StunResult ret, CancellationToken token)
{
var json = $"{{\"endpoint\":\"{ret.EndPoint}\",\"local_endpoint\":\"{ret.LocalEndPoint}\", \"nattype\": \"{ret.NatType}\"}}";
var content = new StringContent(json);
using (var client = new HttpClient())
{
var response = await client.PostAsync(url, content, token);
if (response.StatusCode == HttpStatusCode.OK)
{
json = await response.Content.ReadAsStringAsync();
var res = Json.From <Response>(json);
return(new P2PSettings
{
SelfId = res.id,
Peers = res.peers.Select(x => x.Create()).ToArray()
});
}
else if (response.StatusCode == HttpStatusCode.RequestTimeout)
{
throw new Exception("Matching Timeout");
}
}
throw new Exception("Matching fail");
}
/// <summary>
/// Processes a received stun message.
/// </summary>
/// <returns>Stun result</returns>
/// <param name="inputData">Input raw stun message</param>
public static StunResult ProcessStun(byte[] inputData, int inputDataLength)
{
StunResult retVal = new StunResult();
if (inputDataLength < 20)
{
return(retVal);
}
byte[] messageShortBytes = new byte[2];
Array.Copy(inputData, 0, messageShortBytes, 0, 2);
UdpMeshCommon.FlipEndian(ref messageShortBytes);
int messageTypeCombined = BitConverter.ToInt16(messageShortBytes, 0);
Array.Copy(inputData, 2, messageShortBytes, 0, 2);
UdpMeshCommon.FlipEndian(ref messageShortBytes);
int messageLength = BitConverter.ToInt16(messageShortBytes, 0);
byte[] messageGuidBytes = new byte[16];
Array.Copy(inputData, 4, messageGuidBytes, 0, 16);
retVal.messageGuid = new Guid(messageGuidBytes);
int bytesToRead = messageLength;
while (bytesToRead > 0)
{
if (bytesToRead < 4)
{
return(retVal);
}
Array.Copy(inputData, inputData.Length - bytesToRead, messageShortBytes, 0, 2);
UdpMeshCommon.FlipEndian(ref messageShortBytes);
int attrType = BitConverter.ToUInt16(messageShortBytes, 0);
bytesToRead -= 2;
Array.Copy(inputData, inputData.Length - bytesToRead, messageShortBytes, 0, 2);
UdpMeshCommon.FlipEndian(ref messageShortBytes);
int attrLength = BitConverter.ToUInt16(messageShortBytes, 0);
bytesToRead -= 2;
if (attrLength > 0)
{
byte[] attrBytes = new byte[attrLength];
Array.Copy(inputData, inputData.Length - bytesToRead, attrBytes, 0, attrLength);
bytesToRead -= attrLength;
if (attrType == 1 && attrBytes[1] == 1 && attrLength == 8)
{
Array.Copy(attrBytes, 2, messageShortBytes, 0, 2);
UdpMeshCommon.FlipEndian(ref messageShortBytes);
retVal.port = BitConverter.ToUInt16(messageShortBytes, 0);
byte[] ipBytes = new byte[4];
Array.Copy(attrBytes, 4, ipBytes, 0, 4);
retVal.remoteAddr = new IPAddress(ipBytes);
retVal.success = true;
}
if (attrType == 1 && attrBytes[1] == 2 && attrLength == 20)
{
Array.Copy(attrBytes, 2, messageShortBytes, 0, 2);
UdpMeshCommon.FlipEndian(ref messageShortBytes);
retVal.port = BitConverter.ToUInt16(messageShortBytes, 0);
byte[] ipBytes = new byte[16];
Array.Copy(attrBytes, 4, ipBytes, 0, 16);
retVal.remoteAddr = new IPAddress(ipBytes);
retVal.success = true;
}
if (attrType == 32 && attrBytes[1] == 1 && attrLength == 8)
{
Array.Copy(attrBytes, 2, messageShortBytes, 0, 2);
//Xor with magic cookie
XorBytes(messageShortBytes, messageGuidBytes);
UdpMeshCommon.FlipEndian(ref messageShortBytes);
retVal.port = BitConverter.ToUInt16(messageShortBytes, 0);
byte[] ipBytes = new byte[4];
Array.Copy(attrBytes, 4, ipBytes, 0, 4);
//Xor with magic cookie
XorBytes(ipBytes, messageGuidBytes);
retVal.remoteAddr = new IPAddress(ipBytes);
retVal.success = true;
}
if (attrType == 32 && attrBytes[1] == 2 && attrLength == 20)
{
Array.Copy(attrBytes, 2, messageShortBytes, 0, 2);
//Xor with magic cookie
XorBytes(messageShortBytes, messageGuidBytes);
UdpMeshCommon.FlipEndian(ref messageShortBytes);
retVal.port = BitConverter.ToUInt16(messageShortBytes, 0);
byte[] ipBytes = new byte[16];
Array.Copy(attrBytes, 4, ipBytes, 0, 16);
//Xor with magic cookie
XorBytes(ipBytes, messageGuidBytes);
retVal.remoteAddr = new IPAddress(ipBytes);
retVal.success = true;
}
}
}
if (callback != null)
{
callback(retVal);
}
return(retVal);
}
