public static IPEndPoint GetMappedAddress(this StunAttribute attribute)
{
var variable = attribute.Variable;
if (variable[0] != 0)
{
Debug.LogWarning($"MAPPED-ADDRESS first byte must be 0x00, got 0x{variable[0].ToString("X2")}");
}
var family = (AddressFamily)variable[1];
var port = (ushort)((variable[2] << 8) | variable[3]);
var addressSize = variable.Length - sizeof(ushort) * 2;
if (family == AddressFamily.IPv4 && addressSize != 4)
{
Debug.LogWarning($"MAPPED-ADDRESS with family {family} needs to have 32 bits, got {addressSize * 8} bits");
}
else if (family == AddressFamily.IPv6 && addressSize != 16)
{
Debug.LogWarning($"MAPPED-ADDRESS with family {family} needs to have 128 bits, got {addressSize * 8} bits");
}
var addressBytes = new byte[addressSize];
Array.Copy(variable, 4, addressBytes, 0, addressBytes.Length);
var ipAddress = new IPAddress(addressBytes);
return(new IPEndPoint(ipAddress, port));
}
private async void Start()
{
var hosts = new string[] {
"stun://localhost:3478",
"stun://127.0.0.1:3478",
// Google
"stun://stun.l.google.com:19302",
"stun://stun1.l.google.com:19302",
"stun://stun2.l.google.com:19302",
"stun://stun3.l.google.com:19302",
"stun://stun4.l.google.com:19302",
// Other
"stun://stun.voip.blackberry.com:3478",
"stun://stun.voipgate.com:3478",
"stun://stun.voys.nl:3478",
"stun://stun1.faktortel.com.au:3478",
// TCP
"stun://stun.sipnet.net:3478",
"stun://stun.sipnet.ru:3478",
"stun://stun.stunprotocol.org:3478",
};
var req = new StunMessage();
var software = new StunAttribute(StunAttributeType.SOFTWARE, req);
software.SetSoftware("Ice Cold Mirror");
req.attributes.Add(software);
var clientUdp = new StunClientUdp();
var clientTcp = new StunClientTcp();
await Task.WhenAll(hosts.Select(async(host) => {
try {
var res = await clientUdp.SendRequest(req, host).AwaitWithTimeout(1500);
Debug.Log("UDP: " + res);
var indication = res.attributes.First(a => a.Type == StunAttributeType.XOR_MAPPED_ADDRESS).GetXorMappedAddress();
Debug.LogWarning($"UDP: {host} STUN indication is {indication}");
} catch (Exception e) {
Debug.LogException(new Exception($"UDP: STUN host \"{host}\" failed", e));
}
}).ToArray());
await Task.WhenAll(hosts.Select(async(host) => {
try {
var res = await clientTcp.SendRequest(req, host).AwaitWithTimeout(1500);
Debug.Log("TCP: " + res);
var indication = res.attributes.First(a => a.Type == StunAttributeType.XOR_MAPPED_ADDRESS).GetXorMappedAddress();
Debug.LogWarning($"TCP: {host} STUN indication is {indication}");
} catch (Exception e) {
Debug.LogException(new Exception($"TCP: STUN host \"{host}\" failed", e));
}
}).ToArray());
}
public static IPEndPoint GetXorMappedAddress(this StunAttribute attribute)
{
var variable = attribute.Variable;
if (variable[0] != 0)
{
Debug.LogWarning($"XOR-MAPPED-ADDRESS first byte must be 0x00, got 0x{variable[0].ToString("X2")}");
}
var family = (AddressFamily)variable[1];
var xPort = (ushort)((variable[2] << 8) | variable[3]);
// xor port with 16 most significant bit of magic cookie
var port = (ushort)(xPort ^ ((magicCookieBytes[0] << 8) | magicCookieBytes[1]));
var addressSize = variable.Length - sizeof(ushort) * 2;
if (family == AddressFamily.IPv4 && addressSize != 4)
{
Debug.LogWarning($"XOR-MAPPED-ADDRESS with family {family} needs to have 32 bits, got {addressSize * 8} bits");
}
else if (family == AddressFamily.IPv6 && addressSize != 16)
{
Debug.LogWarning($"XOR-MAPPED-ADDRESS with family {family} needs to have 128 bits, got {addressSize * 8} bits");
}
var addressBytes = new byte[addressSize];
Array.Copy(variable, 4, addressBytes, 0, addressBytes.Length);
// xor each address byte with the magic cookie byte
for (int i = 0; i < 4; i++)
{
addressBytes[i] ^= magicCookieBytes[i];
}
if (family == AddressFamily.IPv6)
{
var header = attribute.Owner.header;
// getting the transaction id generates GC, only call when ipv6
var transactionID = header.TransactionId;
// xor each byte with the concatenation of magic cookie and transaction id
for (int i = 0; i < transactionID.Length; i++)
{
addressBytes[i + 4] ^= transactionID[i];
}
}
var ipAddress = new IPAddress(addressBytes);
return(new IPEndPoint(ipAddress, port));
}
public StunMessage(Stream stream)
{
this.header = new StunMessageHeader(stream);
var pos = 0;
while (pos < header.Length)
{
var attr = new StunAttribute(stream, this);
pos += attr.AttrbiuteLength;
this.attributes.Add(attr);
}
}
public static void SetSoftware(this StunAttribute attribute, string info)
{
if (info.Length >= 128)
{
throw new ArgumentException("String must be less than 128 characteres", nameof(info));
}
var bytes = Encoding.UTF8.GetBytes(info);
if (bytes.Length >= 763)
{
throw new ArgumentException("String must be less than 763 bytes", nameof(info));
}
attribute.Variable = bytes;
}
public static void SetMappedAddress(this StunAttribute attribute, IPEndPoint endPoint)
{
throw new NotImplementedException();
}
public static string GetSoftware(this StunAttribute attribute)
{
return(Encoding.UTF8.GetString(attribute.Variable));
}
