private static void ExecuteRequest(object arg)
{
try
{
using (Socket myClient = (Socket)arg)
{
if (myClient.Connected)
{
byte[] httpRequest = ReadToEnd(myClient);
Parser http = new Parser(httpRequest);
if (http.Items == null || http.Items.Count <= 0 || !http.Items.ContainsKey("Host"))
{
WriteLog("REQUEST {0} bytes, headers not found.", httpRequest.Length);
}
else
{
WriteLog("REQUEST {0} bytes, method{1}, host {2}:{3}", httpRequest.Length, http.Method, http.Host, http.Port);
// WriteLog(http.GetHeadersAsString());
byte[] response = null;
if (_NeedAuth)
{
if (!http.Items.ContainsKey("Authorization"))
{
response = GetHTTPError(401, "Unauthorized");
myClient.Send(response, response.Length, SocketFlags.None);
return;
}
else
{
string auth = Encoding.UTF8.GetString(Convert.FromBase64String(http.Items["Authorization"].Source.Replace("Basic ", "")));
string login = auth.Split(":".ToCharArray())[0];
string pwd = auth.Split(":".ToCharArray())[1];
if (_Login != login || _Password != pwd)
{
// wrong login or password
response = GetHTTPError(401, "Unauthorized");
myClient.Send(response, response.Length, SocketFlags.None);
return;
}
}
}
//check blacklist
if (_AllowBlackList && _BlackList != null && Array.IndexOf(_BlackList, http.Host.ToLower()) != -1)
{
response = GetHTTPError(403, "Forbidden");
myClient.Send(response, response.Length, SocketFlags.None);
return;
}
bool ready = false;
if (UseCache)
{
if (Cache.HasResource(http.Path))
{
ready = true;
response = Cache.GetData(http.Path);
if (response != null)
{
myClient.Send(response, response.Length, SocketFlags.None);
}
}
}
if (!ready)
{
IPHostEntry myIPHostEntry = Dns.GetHostEntry(http.Host);
if (myIPHostEntry == null || myIPHostEntry.AddressList == null || myIPHostEntry.AddressList.Length <= 0)
{
WriteLog("Can't determine IP-adress by host {0}.", http.Host);
}
else
{
IPEndPoint myIPEndPoint = new IPEndPoint(myIPHostEntry.AddressList[0], http.Port);
if (http.Method == Parser.MethodsList.CONNECT)
{
WriteLog("Protocol HTTPS not impemented.");
response = GetHTTPError(501, "Not Implemented");
} // HTTP.Parser.MethodsList.CONNECT
else
{
//if (!ready)
{
//redirect
using (Socket myRerouting = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp))
{
myRerouting.Connect(myIPEndPoint);
if (myRerouting.Send(httpRequest, httpRequest.Length, SocketFlags.None) != httpRequest.Length)
{
WriteLog("Data to host {0} was not sended...", http.Host);
}
else
{
//getting answer
Parser httpResponse = new Parser(ReadToEnd(myRerouting));
if (httpResponse.Source != null && httpResponse.Source.Length > 0)
{
WriteLog("Request recieved {0} bytes, status code {1}", httpResponse.Source.Length, httpResponse.StatusCode);
// WriteLog(httpResponse.GetHeadersAsString());
response = httpResponse.Source;
switch (httpResponse.StatusCode)
{
case 400:
case 403:
case 404:
case 407:
case 500:
case 501:
case 502:
case 503:
response = GetHTTPError(httpResponse.StatusCode, httpResponse.StatusMessage);
break;
default:
if (_AppendHtml)
{
//check if html
if (httpResponse.Items.ContainsKey("Content-Type") && ((ItemContentType)httpResponse.Items["Content-Type"]).Value == "text/html")
{
//get body
string body = httpResponse.GetBodyAsString();
body = Regex.Replace(body, "<title>(?<title>.*?)</title>", "<title>ProxyServer - $1</title>");
body = Regex.Replace(body, "(<body.*?>)", "$1<div style='height:20px;width:100%;background-color:black;color:white;font-weight:bold;text-align:center;'>Example of Proxy Server</div>");
httpResponse.SetStringBody(body);
response = httpResponse.Source;
}
}
//you can change image data too
break;
}
}
else
{
WriteLog("Recieved answer 0 byte");
}
}
myRerouting.Close();
}
} // HTTP.Parser.MethodsList.CONNECT
if (AllowStoreInCache)
{
Cache.SetData(http.Path, response);
}
}
if (response != null)
{
myClient.Send(response, response.Length, SocketFlags.None);
}
}
}
}
myClient.Close();
}
}
}
catch (Exception ex)
{
WriteLog("Error: ", ex.Message);
}
}
