Class Socks5LogicHandler

java.lang.Object

org.apache.mina.proxy.AbstractProxyLogicHandler

org.apache.mina.proxy.handlers.socks.AbstractSocksLogicHandler

org.apache.mina.proxy.handlers.socks.Socks5LogicHandler

All Implemented Interfaces:

ProxyLogicHandler

public class Socks5LogicHandler
extends AbstractSocksLogicHandler

Socks5LogicHandler.java - SOCKS5 authentication mechanisms logic handler.

Since:

MINA 2.0.0-M3

Field Summary

Fields

Modifier and Type	Field	Description
private static final String	GSS_CONTEXT	The Java GSS-API context attribute key.
private static final String	GSS_TOKEN	Last GSS token received attribute key.
private static final String	HANDSHAKE_STEP	The current step in the handshake attribute key.
private static final org.slf4j.Logger	LOGGER
private static final String	SELECTED_AUTH_METHOD	The selected authentication method attribute key.

Fields inherited from class AbstractSocksLogicHandler

request

Constructor Summary

Constructors

Constructor	Description
Socks5LogicHandler(ProxyIoSession proxyIoSession)

Method Summary

Modifier and Type	Method	Description
protected void	closeSession(String message)	Closes the session.
void	doHandshake(IoFilter.NextFilter nextFilter)	Performs the handshake process.
private IoBuffer	encodeAuthenticationPacket(SocksProxyRequest request)	Encodes the authentication packet for supported authentication methods.
private IoBuffer	encodeGSSAPIAuthenticationPacket(SocksProxyRequest request)	Encodes the authentication packet for supported authentication methods.
private IoBuffer	encodeInitialGreetingPacket(SocksProxyRequest request)	Encodes the initial greeting packet.
private IoBuffer	encodeProxyRequestPacket(SocksProxyRequest request)	Encodes the proxy authorization request packet.
protected void	handleResponse(IoFilter.NextFilter nextFilter, IoBuffer buf, int step)	Handle a SOCKS v5 response from the proxy server.
void	messageReceived(IoFilter.NextFilter nextFilter, IoBuffer buf)	Handles incoming data during the handshake process.
private void	writeRequest(IoFilter.NextFilter nextFilter, SocksProxyRequest request, int step)	Encodes a SOCKS5 request and writes it to the next filter so it can be sent to the proxy server.

Methods inherited from class AbstractProxyLogicHandler

closeSession, enqueueWriteRequest, flushPendingWriteRequests, getProxyFilter, getProxyIoSession, getSession, isHandshakeComplete, setHandshakeComplete, writeData

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

LOGGER

private static final org.slf4j.Logger LOGGER

SELECTED_AUTH_METHOD

private static final String SELECTED_AUTH_METHOD

The selected authentication method attribute key.

HANDSHAKE_STEP

private static final String HANDSHAKE_STEP

The current step in the handshake attribute key.

GSS_CONTEXT

private static final String GSS_CONTEXT

The Java GSS-API context attribute key.

GSS_TOKEN

private static final String GSS_TOKEN

Last GSS token received attribute key.

Constructor Details

Socks5LogicHandler

public Socks5LogicHandler(ProxyIoSession proxyIoSession)

Parameters:

proxyIoSession - The original session

See Also:

• AbstractSocksLogicHandler(ProxyIoSession)

Method Details

doHandshake

public void doHandshake(IoFilter.NextFilter nextFilter)

Performs the handshake process.

Parameters:

nextFilter - the next filter

encodeInitialGreetingPacket

private IoBuffer encodeInitialGreetingPacket(SocksProxyRequest request)

Encodes the initial greeting packet.

Parameters:

request - the socks proxy request data

Returns:

the encoded buffer

encodeProxyRequestPacket

private IoBuffer encodeProxyRequestPacket(SocksProxyRequest request)

Encodes the proxy authorization request packet.

Parameters:

request - the socks proxy request data

Returns:

the encoded buffer

encodeAuthenticationPacket

private IoBuffer encodeAuthenticationPacket(SocksProxyRequest request)
                                     throws GSSException

Encodes the authentication packet for supported authentication methods.

Parameters:

request - the socks proxy request data

Returns:

the encoded buffer, if null then authentication step is over and handshake process can jump immediately to the next step without waiting for a server reply.

Throws:

GSSException - when something fails while using GSSAPI

encodeGSSAPIAuthenticationPacket

private IoBuffer encodeGSSAPIAuthenticationPacket(SocksProxyRequest request)
                                           throws GSSException

Encodes the authentication packet for supported authentication methods.

Parameters:

request - the socks proxy request data

Returns:

the encoded buffer

Throws:

GSSException - when something fails while using GSSAPI

writeRequest

private void writeRequest(IoFilter.NextFilter nextFilter,
 SocksProxyRequest request,
 int step)

Encodes a SOCKS5 request and writes it to the next filter so it can be sent to the proxy server.

Parameters:

nextFilter - the next filter

request - the request to send.

step - the current step in the handshake process

messageReceived

public void messageReceived(IoFilter.NextFilter nextFilter,
 IoBuffer buf)

Handles incoming data during the handshake process. Should consume only the handshake data from the buffer, leaving any extra data in place.

Parameters:

nextFilter - the next filter

buf - the buffered data received

handleResponse

protected void handleResponse(IoFilter.NextFilter nextFilter,
 IoBuffer buf,
 int step)
                       throws Exception

Handle a SOCKS v5 response from the proxy server.

Parameters:

nextFilter - the next filter

buf - the buffered data received

step - the current step in the authentication process

Throws:

Exception - If something went wrong

closeSession

protected void closeSession(String message)

Closes the session. If any GSSContext is present in the session then it is closed.

Overrides:

closeSession in class AbstractProxyLogicHandler

Parameters:

message - the error message