///<summary>Processes a specified query and connects to the requested HTTP web server.</summary>
///<param name="Query">A string containing the query to process.</param>
///<remarks>If there's an error while processing the HTTP request or when connecting to the remote server, the Proxy sends a "400 - Bad Request" error to the client.</remarks>
private void ProcessQuery(string Query)
{
HeaderFields = ParseQuery(Query);
if (HeaderFields == null || !HeaderFields.ContainsKey("Host"))
{
SendBadRequest();
return;
}
#region Parse destination address and port
int Port;
string Host;
int Ret;
if (HttpRequestType.ToUpper().Equals("CONNECT")) //HTTPS
{
isThisSSL = true;
this.isPayloadSecure = true;
Ret = RequestedPath.IndexOf(":");
if (Ret >= 0)
{
Host = RequestedPath.Substring(0, Ret);
if (RequestedPath.Length > Ret + 1)
{
Port = int.Parse(RequestedPath.Substring(Ret + 1));
CurrentHTTPSport = Port;
}
else
{
Port = 443;
CurrentHTTPSport = 443;
}
}
else
{
Host = RequestedPath;
Port = 443;
CurrentHTTPSport = 443;
}
}
else
{
isThisSSL = false;
Ret = ((string)HeaderFields["Host"]).IndexOf(":");
if (Ret > 0)
{
Host = ((string)HeaderFields["Host"]).Substring(0, Ret);
Port = int.Parse(((string)HeaderFields["Host"]).Substring(Ret + 1));
CurrentHTTPSport = Port;
}
else
{
Host = (string)HeaderFields["Host"];
Port = 80;
CurrentHTTPSport = 80;
}
if (HttpRequestType.ToUpper().Equals("GET") == false)
{
int index = Query.IndexOf("\r\n\r\n");
m_HttpPost = Query.Substring(index + 4);
}
}
#endregion
#region Create destination socket
try {
IPEndPoint DestinationEndPoint = new IPEndPoint(Dns.Resolve(Host).AddressList[0], Port);
if (this.isPayloadSecure)
{
SecurityOptions options = new SecurityOptions(
SecureProtocol.Ssl3 | SecureProtocol.Tls1, // use SSL3 or TLS1
null, // not required for SSL client
ConnectionEnd.Client, // this is the client side
CredentialVerification.None, // do not check the certificate -- this should not be used in a real-life application :-)
null, // not used with automatic certificate verification
"www.bogus.com", // this is the common name of the Microsoft web server
SecurityFlags.Default, // use the default security flags
SslAlgorithms.SECURE_CIPHERS, // only use secure ciphers
null); // do not process certificate requests.
// This line for intercept proxy
DestinationSocket = new SecureSocket(DestinationEndPoint.AddressFamily, SocketType.Stream, ProtocolType.Tcp, options);
// This line for pass-through proxy
//DestinationSocket = new SecureSocket(DestinationEndPoint.AddressFamily, SocketType.Stream, ProtocolType.Tcp);
}
else
{
DestinationSocket = new SecureSocket(DestinationEndPoint.AddressFamily, SocketType.Stream, ProtocolType.Tcp);
}
if (HeaderFields.ContainsKey("Proxy-Connection") && HeaderFields["Proxy-Connection"].ToLower().Equals("keep-alive"))
{
DestinationSocket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.KeepAlive, 1);
}
DestinationSocket.BeginConnect(DestinationEndPoint, new AsyncCallback(this.OnConnected), DestinationSocket);
} catch {
SendBadRequest();
return;
}
#endregion
}
