/// <summary>
/// Performs the initial greeting.
/// </summary>
/// <returns>The greeting-message returned by the SOCKS5 server.</returns>
/// <exception cref="Socks5Exception">The server returned invalid or
/// unexpected data.</exception>
private ServerGreeting PerformGreeting()
{
var methods = new HashSet <AuthMethod>()
{
AuthMethod.None
};
if (!String.IsNullOrEmpty(Username))
{
methods.Add(AuthMethod.Username);
}
byte[] bytes = new ClientGreeting(methods).Serialize();
stream.Write(bytes, 0, bytes.Length);
// Read the server's response.
bytes = new byte[2];
stream.Read(bytes, 0, 2);
return(ServerGreeting.Deserialize(bytes));
}
/// <summary>
/// Performs the initial greeting.
/// </summary>
/// <exception cref="Socks5Exception">The client sent invalid data, or
/// requires authentication.</exception>
/// <exception cref="IOException">The stream could not be read, or the
/// operation timed out.</exception>
private void PerformGreeting()
{
ByteBuilder b = new ByteBuilder();
using (var r = new BinaryReader(stream, Encoding.UTF8, true))
{
byte[] bytes = r.ReadBytes(2);
b.Append(bytes);
// The number of method-bytes following is contained in the second byte.
b.Append(r.ReadBytes(bytes[1]));
}
ClientGreeting greeting = ClientGreeting.Deserialize(b.ToArray());
// We only accept an authentication method of 'none'.
if (!greeting.Methods.Contains(AuthMethod.None))
{
Dispose();
throw new Socks5Exception("Client requires authentication.");
}
// Send back our greeting response.
var response = new ServerGreeting(AuthMethod.None).Serialize();
stream.Write(response, 0, response.Length);
}