public static async Task <NatTypeTestResult> DiscoveryNatTypeAsync(Socks5Server socks5, CancellationToken ctx = default)
{
var stunServer = Global.Settings.STUN_Server;
var port = (ushort)Global.Settings.STUN_Server_Port;
var local = new IPEndPoint(IPAddress.Any, 0);
var socks5Option = new Socks5CreateOption
{
Address = await DnsUtils.LookupAsync(socks5.Hostname),
Port = socks5.Port,
UsernamePassword = new UsernamePassword
{
UserName = socks5.Username,
Password = socks5.Password
}
};
var ip = await DnsUtils.LookupAsync(stunServer);
if (ip == null)
{
return(new NatTypeTestResult {
Result = "Wrong STUN Server!"
});
}
using IUdpProxy proxy = ProxyFactory.CreateProxy(ProxyType.Socks5, new IPEndPoint(IPAddress.Loopback, 0), socks5Option);
using var client = new StunClient5389UDP(new IPEndPoint(ip, port), local, proxy);
await client.ConnectProxyAsync(ctx);
try
{
await client.QueryAsync(ctx);
}
finally
{
await client.CloseProxyAsync(ctx);
}
var res = client.State;
var result = GetSimpleResult(res);
return(new NatTypeTestResult
{
Result = result,
LocalEnd = res.LocalEndPoint?.ToString(),
PublicEnd = res.PublicEndPoint?.ToString()
});
}
public StunClient5389UDP(string server, ushort port = 3478, IPEndPoint local = null, IUdpProxy proxy = null, IDnsQuery dnsQuery = null)
: base(server, port, local, proxy, dnsQuery)
{
Timeout = TimeSpan.FromSeconds(3);
}
