internal void Add(ByteVector data)
{
Add(data.Data, 0, data.Size);
}
int AnalyzeReply(ByteVector reply, out string reason)
{
if(0 == reply.Size)
throw new SocketException(SockErrors.WSAECONNREFUSED);
//throw new ProxyErrorException("Web proxy close the connection.");
//reply should be in following form:
//"HTTP/x.x xxx reason(\r)?\n"
string replyStr = Encoding.ASCII.GetString(reply.Data, 0, reply.Size);
Match m = _replyRegEx.Match(replyStr);
if((reply.Size < 14) || (m.Groups.Count != 4))
throw new ProtocolViolationException("Web proxy reply is incorrect.");
int code = int.Parse(m.Groups["code"].Value);
reason = m.Groups["reason"].Value;
return code;
}
ByteVector ReadReply()
{
ByteVector reply = new ByteVector();
byte[] buf = new byte[512];
while(true)
{
int num = Receive(buf);
if(0 == num)
break;
reply.Add(buf, 0, num);
//handle the end of reply
int afterEndPos = FindReplyEnd(reply.Data, reply.Size);
if(afterEndPos > 0)
{
if(afterEndPos < num) //read after reply finished?
{
//put data back into the buffer for further
//processing in receive functions
PutBufferData(buf, afterEndPos, num - afterEndPos);
reply.CutTail(num - afterEndPos);
}
break;
}
if(reply.Size > _maxReplySize)
throw new ProtocolViolationException("Web proxy reply exceed maximum length.");
}
return reply;
}
override internal void Connect(string hostName, int hostPort)
{
CheckDisposed();
SetProgress(true);
try
{
if (null == hostName)
{
throw new ArgumentNullException("hostName", "The value cannot be null.");
}
if (hostPort < IPEndPoint.MinPort || hostPort > IPEndPoint.MaxPort)
{
throw new ArgumentOutOfRangeException("hostPort", "Value, specified for the port is out of the valid range.");
}
//------------------------------------
// Get end point for the proxy server
IPHostEntry proxyEntry = GetHostByName(_proxyServer);
if (null == proxyEntry)
{
throw new SocketException(SockErrors.WSAHOST_NOT_FOUND);
}
//throw new HostNotFoundException("Unable to resolve proxy name.");
IPEndPoint proxyEndPoint;
if (_proxyServer.Equals("127.0.0.1"))
{
proxyEndPoint = new IPEndPoint(IPAddress.Parse("127.0.0.1"), _proxyPort);
}
else
{
proxyEndPoint = ConstructEndPoint(proxyEntry, _proxyPort);
}
//------------------------------------------
// Connect to proxy server
_socket.Connect(proxyEndPoint);
bool useCredentials = PreAuthenticate;
while (true)
{
//------------------------------------------
// Send CONNECT command
byte[] cmd = GetConnectCmd(hostName, hostPort, useCredentials);
NStream.Write(cmd, 0, cmd.Length);
//-----------------------------------------
// Read the reply
ByteVector reply = ReadReply();
//------------------------------------------
// Analyze reply
string reason = null;
int code = AnalyzeReply(reply, out reason);
//------------------------------------------
//is good return code?
if (code >= 200 && code <= 299)
{
return;
}
//------------------------------------------
//If Proxy Authentication Required
//but we do not issued it, then try again
if ((407 == code) &&
!useCredentials &&
(_proxyUser != null))
{
useCredentials = true;
continue;
}
//string msg = string.Format("Connection refused by web proxy: {0} ({1}).", reason, code);
//throw new ProxyErrorException(msg);
throw new SocketException(SockErrors.WSAECONNREFUSED);
}
}
finally
{
SetProgress(false);
}
}