private static IPEndPoint GetFirstRespondingEndpoint(string sHostPortList)
{
string str;
IPAddress[] addressArray;
if ((sHostPortList == null) || sHostPortList.Trim().Equals(string.Empty))
{
return(null);
}
sHostPortList = Utilities.TrimAfter(sHostPortList, ';');
IPEndPoint point = null;
int iPort = 80;
Utilities.CrackHostAndPort(sHostPortList, out str, ref iPort);
try
{
addressArray = DNSResolver.GetIPAddressList(str, true, null);
}
catch
{
//KProxyApplication.Log.LogFormat("KProxy.network.gateway> Unable to resolve upstream proxy '{0}'... ignoring.", new object[] { sHostPortList });
return(null);
}
try
{
foreach (IPAddress address in addressArray)
{
try
{
Socket socket = new Socket(address.AddressFamily, SocketType.Stream, ProtocolType.Tcp);
socket.NoDelay = true;
if (KProxyApplication.oProxy._DefaultEgressEndPoint != null)
{
socket.Bind(KProxyApplication.oProxy._DefaultEgressEndPoint);
}
socket.Connect(address, iPort);
point = new IPEndPoint(address, iPort);
socket.Close();
break;
}
catch (Exception exception)
{
if (!KProxyApplication.Prefs.GetBoolPref("KProxy.network.dns.fallback", true))
{
break;
}
//KProxyApplication.Log.LogFormat("KProxy.network.gateway.connect>Connection to {0} failed. {1}. Will try DNS Failover if available.", new object[] { address.ToString(), exception.Message });
}
}
return(point);
}
catch
{
return(null);
}
}
private void TunnelDirectly()
{
string str;
this._mySession.SetBitFlag(SessionFlags.SentToGateway, false);
int iPort = 0x1bb;
string sHostPort = this._mySession.oFlags["x-overrideHost"];
if (sHostPort == null)
{
sHostPort = this._mySession.PathAndQuery;
}
Utilities.CrackHostAndPort(sHostPort, out str, ref iPort);
try
{
IPAddress[] arrDestIPs = DNSResolver.GetIPAddressList(str, true, this._mySession.Timers);
this.socketRemote = ServerChatter.CreateConnectedSocket(arrDestIPs, iPort, this._mySession);
}
catch (Exception exception)
{
this._indicateTunnelFailure(0x1f8, exception.Message);
return;
}
try
{
this._mySession.oResponse.headers = new HTTPResponseHeaders();
this._mySession.oResponse.headers.HTTPVersion = this._mySession.oRequest.headers.HTTPVersion;
this._mySession.oResponse.headers.HTTPResponseCode = 200;
this._mySession.oResponse.headers.HTTPResponseStatus = "200 Blind-Connection Established";
this._mySession.oResponse.headers.Add("KavprotProxyGateway", "Direct");
this._mySession.oResponse.headers.Add("StartTime", DateTime.Now.ToString("HH:mm:ss.fff"));
this.socketClient.Send(this._mySession.oResponse.headers.ToByteArray(true, true));
this._mySession.oFlags["x-EgressPort"] = (this.socketRemote.LocalEndPoint as IPEndPoint).Port.ToString();
this.socketClient.BeginReceive(this.arrRequestBytes, 0, this.arrRequestBytes.Length, SocketFlags.None, new AsyncCallback(this.OnClientReceive), this.socketClient);
this.socketRemote.BeginReceive(this.arrResponseBytes, 0, this.arrResponseBytes.Length, SocketFlags.None, new AsyncCallback(this.OnRemoteReceive), this.socketRemote);
this.WaitForCompletion();
}
catch
{
try
{
this.socketRemote.Close();
this.socketClient.Close();
}
catch
{
}
}
}
private void NetworkChange_NetworkAddressChanged(object sender, EventArgs e)
{
try
{
DNSResolver.ClearCache();
//KProxyApplication.Log.LogString("NetworkAddressChanged.");
if (this.oAutoProxy != null)
{
this.oAutoProxy.iAutoProxySuccessCount = 0;
}
if ((KPCONFIG.bForwardToGateway && (this.piPrior != null)) && this.piPrior.bUseManualProxies)
{
this._DetermineGatewayIPEndPoints();
}
}
catch (Exception exception)
{
KProxyApplication.ReportException(exception);
}
}
private bool ConnectToHost()
{
IPEndPoint point = null;
string str2;
string str3;
IPAddress[] addressArray;
string sHostAndPort = this.m_session.oFlags["x-overrideHost"];
if (sHostAndPort == null)
{
sHostAndPort = this.m_session.host;
}
if (this.m_session.oFlags["x-overrideGateway"] != null)
{
if (string.Equals("DIRECT", this.m_session.oFlags["x-overrideGateway"], StringComparison.OrdinalIgnoreCase))
{
this.m_session.bypassGateway = true;
}
else
{
point = Utilities.IPEndPointFromHostPortString(this.m_session.oFlags["x-overrideGateway"]);
}
}
else if (!this.m_session.bypassGateway)
{
int tickCount = Environment.TickCount;
point = KProxyApplication.oProxy.FindGatewayForOrigin(this.m_session.oRequest.headers.UriScheme, sHostAndPort);
this.m_session.Timers.GatewayDeterminationTime = Environment.TickCount - tickCount;
}
if (point != null)
{
this._bWasForwarded = true;
}
else if (this.m_session.isFTP)
{
this.m_session.oRequest.FailSession(0x1f6, "Kavprot Proxy - FTP Connection Failed", "[KProxy] Kavprot Proxy does not support proxying FTP traffic without an upstream HTTP->FTP proxy.");
return(false);
}
int iPort = this.m_session.isHTTPS ? 0x1bb : (this.m_session.isFTP ? 0x15 : 80);
Utilities.CrackHostAndPort(sHostAndPort, out str2, ref iPort);
if (point != null)
{
if (this.m_session.isHTTPS)
{
str3 = "GATEWAY:HTTPS:" + str2 + ":" + iPort.ToString();
}
else
{
str3 = "GW:" + point.ToString();
}
}
else
{
str3 = (this.m_session.isHTTPS ? "HTTPS:" : "") + str2 + ":" + iPort.ToString();
}
if (((this.pipeServer != null) && !this.m_session.oFlags.ContainsKey("X-ServerPipe-Marriage-Trumps-All")) && !this.SIDsMatch(this.m_session.LocalProcessID, str3, this.pipeServer.sPoolKey))
{
this.m_session.oFlags["X-Divorced-ServerPipe"] = string.Format("Had: {0} but needs: {1}", this.pipeServer.sPoolKey, str3);
this._detachServerPipe();
}
if ((this.pipeServer == null) && !this.m_session.oFlags.ContainsKey("X-Bypass-ServerPipe-Reuse-Pool"))
{
this.pipeServer = Proxy.htServerPipePool.DequeuePipe(str3, this.m_session.LocalProcessID, this.m_session.id);
}
if (this.pipeServer != null)
{
StringDictionary dictionary;
this.m_session.Timers.ServerConnected = this.pipeServer.dtConnected;
(dictionary = this.m_session.oFlags)["x-serversocket"] = dictionary["x-serversocket"] + "REUSE " + this.pipeServer._sPipeName;
if ((this.pipeServer.Address != null) && !this.pipeServer.isConnectedToGateway)
{
this.m_session.m_hostIP = this.pipeServer.Address.ToString();
this.m_session.oFlags["x-hostIP"] = this.m_session.m_hostIP;
}
return(true);
}
int port = iPort;
if (point != null)
{
addressArray = new IPAddress[] { point.Address };
port = point.Port;
}
else
{
try
{
addressArray = DNSResolver.GetIPAddressList(str2, true, this.m_session.Timers);
}
catch (Exception exception)
{
this.m_session.oRequest.FailSession(0x1f6, "Kavprot Proxy - DNS Lookup Failed", "KProxy: DNS Lookup for " + Utilities.HtmlEncode(str2) + " failed. " + Utilities.DescribeException(exception));
return(false);
}
if ((port < 0) || (port > 0xffff))
{
this.m_session.oRequest.FailSession(0x1f6, "Invalid Request", "HTTP Request specified an invalid port number.");
return(false);
}
}
try
{
this.pipeServer = new ServerPipe("ServerPipe#" + this.m_session.id.ToString(), this._bWasForwarded);
Socket oSocket = CreateConnectedSocket(addressArray, port, this.m_session);
if (this._bWasForwarded)
{
if (!this.m_session.isHTTPS)
{
this.pipeServer.WrapSocketInPipe(this.m_session, oSocket, false, false, str2, this.m_session.oFlags["https-Client-Certificate"], "GW:" + point.ToString(), ref this.m_session.Timers.HTTPSHandshakeTime);
}
else
{
this.m_session.oFlags["x-CreatedTunnel"] = "KProxy-Created-A-CONNECT-Tunnel";
this.pipeServer.WrapSocketInPipe(this.m_session, oSocket, true, true, str2, this.m_session.oFlags["https-Client-Certificate"], "HTTPS:" + str2 + ":" + iPort.ToString(), ref this.m_session.Timers.HTTPSHandshakeTime);
}
}
else
{
this.pipeServer.WrapSocketInPipe(this.m_session, oSocket, this.m_session.isHTTPS, false, str2, this.m_session.oFlags["https-Client-Certificate"], (this.m_session.isHTTPS ? "HTTPS:" : "") + str2 + ":" + iPort.ToString(), ref this.m_session.Timers.HTTPSHandshakeTime);
}
return(true);
}
catch (Exception exception2)
{
if (this._bWasForwarded)
{
this.m_session.oRequest.FailSession(0x1f6, "Kavprot Proxy - Gateway Connection Failed", "[Kavprot Proxy] Connection to Gateway failed.<BR>Exception Text: " + Utilities.DescribeException(exception2));
}
else
{
this.m_session.oRequest.FailSession(0x1f6, "Kavprot Proxy - Connection Failed", "[Kavprot Proxy] Connection to " + Utilities.HtmlEncode(str2) + " failed.<BR>Exception Text: " + Utilities.DescribeException(exception2));
}
return(false);
}
}