private static void HandleHttpSessionRequest(TcpClient client, string httpCmd, Stream clientStream, string tunnelHostName, List<string> requestLines, CustomBinaryReader clientStreamReader, StreamWriter clientStreamWriter, string securehost)
{
if (httpCmd == null)
{
if (clientStreamReader != null)
clientStreamReader.Dispose();
if (clientStreamWriter != null)
clientStreamWriter.Dispose();
if (clientStream != null)
clientStream.Dispose();
if (client != null)
client.Close();
return;
}
var args = new SessionEventArgs(BUFFER_SIZE);
args.Client = client;
args.tunnelHostName = tunnelHostName;
args.securehost = securehost;
try
{
//break up the line into three components (method, remote URL & Http Version)
var splitBuffer = httpCmd.Split(spaceSplit, 3);
if (splitBuffer.Length != 3)
{
TcpHelper.SendRaw(httpCmd, tunnelHostName, requestLines, args.IsSSLRequest, clientStreamReader.BaseStream);
if (args != null)
args.Dispose();
if (clientStreamReader != null)
clientStreamReader.Dispose();
if (clientStreamWriter != null)
clientStreamWriter.Dispose();
if (clientStream != null)
clientStream.Dispose();
if (client != null)
client.Close();
return;
}
var method = splitBuffer[0];
var remoteUri = splitBuffer[1];
Version version;
if (splitBuffer[2] == "HTTP/1.1")
{
version = new Version(1, 1);
}
else
{
version = new Version(1, 0);
}
if (securehost != null)
{
remoteUri = securehost + remoteUri;
args.IsSSLRequest = true;
}
//construct the web request that we are going to issue on behalf of the client.
args.ProxyRequest = (HttpWebRequest)HttpWebRequest.Create(remoteUri.Trim());
args.ProxyRequest.Proxy = null;
args.ProxyRequest.UseDefaultCredentials = true;
args.ProxyRequest.Method = method;
args.ProxyRequest.ProtocolVersion = version;
args.ClientStream = clientStream;
args.ClientStreamReader = clientStreamReader;
args.ClientStreamWriter = clientStreamWriter;
for (int i = 1; i < requestLines.Count; i++)
{
var rawHeader = requestLines[i];
String[] header = rawHeader.ToLower().Trim().Split(colonSpaceSplit, 2, StringSplitOptions.None);
//if request was upgrade to web-socket protocol then relay the request without proxying
if ((header[0] == "upgrade") && (header[1] == "websocket"))
{
TcpHelper.SendRaw(httpCmd, tunnelHostName, requestLines, args.IsSSLRequest, clientStreamReader.BaseStream);
if (args != null)
args.Dispose();
if (clientStreamReader != null)
clientStreamReader.Dispose();
if (clientStreamWriter != null)
clientStreamWriter.Dispose();
if (clientStream != null)
clientStream.Dispose();
if (client != null)
client.Close();
return;
}
}
SetClientRequestHeaders(requestLines, args.ProxyRequest);
int contentLen = (int)args.ProxyRequest.ContentLength;
args.ProxyRequest.AllowAutoRedirect = false;
args.ProxyRequest.AutomaticDecompression = DecompressionMethods.None;
//If requested interception
if (BeforeRequest != null)
{
args.RequestHostname = args.ProxyRequest.RequestUri.Host;
args.RequestURL = args.ProxyRequest.RequestUri.OriginalString;
args.RequestLength = contentLen;
args.RequestHttpVersion = version;
args.ClientPort = ((IPEndPoint)client.Client.RemoteEndPoint).Port;
args.ClientIpAddress = ((IPEndPoint)client.Client.RemoteEndPoint).Address;
args.RequestIsAlive = args.ProxyRequest.KeepAlive;
BeforeRequest(null, args);
}
string tmpLine;
if (args.CancelRequest)
{
if (args != null)
args.Dispose();
if (clientStreamReader != null)
clientStreamReader.Dispose();
if (clientStreamWriter != null)
clientStreamWriter.Dispose();
if (clientStream != null)
clientStream.Dispose();
if (client != null)
client.Close();
return;
}
args.ProxyRequest.ConnectionGroupName = args.RequestHostname;
args.ProxyRequest.AllowWriteStreamBuffering = true;
//If request was modified by user
if (args.RequestWasModified)
{
ASCIIEncoding encoding = new ASCIIEncoding();
byte[] requestBytes = encoding.GetBytes(args.RequestHtmlBody);
args.ProxyRequest.ContentLength = requestBytes.Length;
Stream newStream = args.ProxyRequest.GetRequestStream();
newStream.Write(requestBytes, 0, requestBytes.Length);
args.ProxyRequest.BeginGetResponse(new AsyncCallback(HandleHttpSessionResponse), args);
}
else
{
//If its a post/put request, then read the client html body and send it to server
if (method.ToUpper() == "POST" || method.ToUpper() == "PUT")
{
SendClientRequestBody(args);
//Http request body sent, now wait asynchronously for response
args.ProxyRequest.BeginGetResponse(new AsyncCallback(HandleHttpSessionResponse), args);
}
else
{
//otherwise wait for response asynchronously
args.ProxyRequest.BeginGetResponse(new AsyncCallback(HandleHttpSessionResponse), args);
}
}
//Now read the next request (if keep-Alive is enabled, otherwise exit this thread)
//If client is pipeling the request, this will be immediately hit before response for previous request was made
tmpLine = null;
requestLines.Clear();
while (!String.IsNullOrEmpty(tmpLine = args.ClientStreamReader.ReadLine()))
{
requestLines.Add(tmpLine);
}
httpCmd = requestLines.Count() > 0 ? requestLines[0] : null;
TcpClient Client = args.Client;
//Http request body sent, now wait for next request
Task.Factory.StartNew(() => HandleHttpSessionRequest(Client, httpCmd, args.ClientStream, args.tunnelHostName, requestLines, args.ClientStreamReader, args.ClientStreamWriter, args.securehost));
}
catch
{
if (args != null)
args.Dispose();
if (clientStreamReader != null)
clientStreamReader.Dispose();
if (clientStreamWriter != null)
clientStreamWriter.Dispose();
if (clientStream != null)
clientStream.Dispose();
if (client != null)
client.Close();
}
}
