private void Connect()
{
try
{
IPAddress ipAddress = null;
int _targetPort = 0;
{
if (_firstPacket[0] == 1)
{
byte[] addr = new byte[4];
Array.Copy(_firstPacket, 1, addr, 0, addr.Length);
ipAddress = new IPAddress(addr);
_targetPort = (_firstPacket[5] << 8) | _firstPacket[6];
_remote_host = ipAddress.ToString();
Logging.Info((_local_proxy ? "Local proxy" : "Direct") + " connect " + _remote_host + ":" + _targetPort);
}
else if (_firstPacket[0] == 4)
{
byte[] addr = new byte[16];
Array.Copy(_firstPacket, 1, addr, 0, addr.Length);
ipAddress = new IPAddress(addr);
_targetPort = (_firstPacket[17] << 8) | _firstPacket[18];
_remote_host = ipAddress.ToString();
Logging.Info((_local_proxy ? "Local proxy" : "Direct") + " connect " + _remote_host + ":" + _targetPort);
}
else if (_firstPacket[0] == 3)
{
int len = _firstPacket[1];
byte[] addr = new byte[len];
Array.Copy(_firstPacket, 2, addr, 0, addr.Length);
_remote_host = Encoding.UTF8.GetString(_firstPacket, 2, len);
_targetPort = (_firstPacket[len + 2] << 8) | _firstPacket[len + 3];
Logging.Info((_local_proxy ? "Local proxy" : "Direct") + " connect " + _remote_host + ":" + _targetPort);
//if (!_local_proxy)
{
if (!IPAddress.TryParse(_remote_host, out ipAddress))
{
if (_config.proxyRuleMode == (int)ProxyRuleMode.UserCustom)
{
HostMap hostMap = HostMap.Instance();
if (hostMap.GetHost(_remote_host, out var host_addr))
{
if (!string.IsNullOrEmpty(host_addr))
{
string lower_host_addr = host_addr.ToLower();
if (lower_host_addr.StartsWith("reject"))
{
Close();
return;
}
if (lower_host_addr.IndexOf('.') >= 0 || lower_host_addr.IndexOf(':') >= 0)
{
if (!IPAddress.TryParse(lower_host_addr, out ipAddress))
{
//
}
}
}
}
}
if (ipAddress == null)
{
ipAddress = Utils.LocalDnsBuffer.Get(_remote_host);
}
}
if (ipAddress == null)
{
ipAddress = Utils.QueryDns(_remote_host, _remote_host.IndexOf('.') >= 0 ? _config.localDnsServer : null);
}
if (ipAddress != null)
{
Utils.LocalDnsBuffer.Set(_remote_host, new IPAddress(ipAddress.GetAddressBytes()));
Utils.LocalDnsBuffer.Sweep();
}
else
{
if (!_local_proxy)
{
throw new SocketException((int)SocketError.HostNotFound);
}
}
}
}
_remote_port = _targetPort;
}
if (ipAddress != null && _config.proxyRuleMode == (int)ProxyRuleMode.UserCustom)
{
HostMap hostMap = HostMap.Instance();
string host_addr;
if (hostMap.GetIP(ipAddress, out host_addr))
{
string lower_host_addr = host_addr.ToLower();
if (lower_host_addr.StartsWith("reject")
)
{
Close();
return;
}
}
}
if (_local_proxy)
{
IPAddress.TryParse(_config.proxyHost, out ipAddress);
_targetPort = _config.proxyPort;
}
// ProxyAuth recv only socks5 head, so don't need to save anything else
IPEndPoint remoteEP = new IPEndPoint(ipAddress, _targetPort);
_remote = new ProxySocketTun(ipAddress.AddressFamily, SocketType.Stream, ProtocolType.Tcp);
_remote.GetSocket().NoDelay = true;
// Connect to the remote endpoint.
_remote.BeginConnect(remoteEP, ConnectCallback, null);
}
catch (Exception e)
{
Logging.LogUsefulException(e);
Close();
}
}