private bool SendProxyConnectProtocol(TelegramExchangerHost serverAddressPair)
{
// SOCKS 4 Protocol
// +----+----+----+----+----+----+----+----+----+----+....+----+
// | VN | CD | DSTPORT | DSTIP | USERID |NULL|
// +----+----+----+----+----+----+----+----+----+----+....+----+
// 1 1 2 4 variable 1
byte[] buffer = new byte[14];
buffer[0] = 0x04; // VN
buffer[1] = 0x01; // CD, 1:CONNECT request，2: BIND request
// DSTPORT
UInt16 port = Convert.ToUInt16(serverAddressPair.Port);
byte[] portBytes = BitConverter.GetBytes(port);
if (BitConverter.IsLittleEndian)
{
Array.Reverse(portBytes);
}
Array.Copy(portBytes, 0, buffer, 2, 2);
// DSTIP
string[] ipAddresses = serverAddressPair.Host.Split('.');
byte[] ipBytes = new byte[4];
for (int i = 0; i < 4; i++)
{
ipBytes[i] = Byte.Parse(ipAddresses[i]);
}
Array.Copy(ipBytes, 0, buffer, 4, 4);
// USERID : using default user name "guest"
byte[] userIDBytes = Encoding.UTF8.GetBytes("guest");
Array.Copy(userIDBytes, 0, buffer, 8, 5);
// add c++ string terminated
buffer[13] = 0x00;
var sendResult = ClientSocket.Send(buffer);
if (!sendResult)
{
OnErrorOccured();
}
return(sendResult);
}
private bool ConnectThroughProxy(TelegramExchangerHost serverAddressPair)
{
if (!ConnectProxy())
{
return(false);
}
if (!SendProxyConnectProtocol(serverAddressPair))
{
return(false);
}
if (!ReceiveProxyConnectResult())
{
return(false);
}
return(true);
}
private bool ConnectDirect(TelegramExchangerHost serverAddressPair)
{
return(ClientSocket.Connect(serverAddressPair.Host, serverAddressPair.Port));
}