Why does my SOCKS proxy code throw SocketException: Malformed reply from SOCKS server?

http, java, proxy, socks

Solution

Explanation of this bug: bugs.java.com/view_bug.do?bug_id=6964547

You need to manually change mode in Socket object using this code:

Class clazzSocks  = socket.getClass();
Method setSockVersion  = null;
Field sockImplField = null; 
SocketImpl socksimpl = null; 
try {
  sockImplField = clazzSocks.getDeclaredField("impl");
  sockImplField.setAccessible(true);
  socksimpl  = (SocketImpl) sockImplField.get(socket);
  Class clazzSocksImpl  =  socksimpl.getClass();
  setSockVersion  = clazzSocksImpl.getDeclaredMethod("setV4");
  setSockVersion.setAccessible(true);
  if(null != setSockVersion){
      setSockVersion.invoke(socksimpl);
  }
  sockImplField.set(socket, socksimpl);
} catch (Exception e) {

}

Problem

Why does my SOCKS proxy code throw `SocketException: Malformed reply from SOCKS server`? I've tried to set in URLConnection or other, but this doesn't work. Only thing that worked - chilkat lib, but it's commercial. So, how I, for example, make http request through a ASOCKS proxy? Maybe exist some free lib for that? For example, that code: ``` SocketAddress addr = new InetSocketAddress(proxy_ip, proxy_port); Proxy proxy = new Proxy(Proxy.Type.SOCKS, addr); Socket socket = new Socket(proxy); InetSocketAddress dest = new InetSocketAddress("google.com", 80); try { socket.connect(dest); } catch (IOException ex) { Logger.getLogger(CheckProxy.class.getName()).log(Level.SEVERE, null, ex); } ``` Throws exception: ``` java.net.SocketException: Malformed reply from SOCKS server at java.net.SocksSocketImpl.readSocksReply(Unknown Source) at java.net.SocksSocketImpl.connect(Unknown Source) at java.net.Socket.connect(Unknown Source) at java.net.Socket.connect(Unknown Source) at proxychecker.CheckProxy.SocksCheck(CheckProxy.java:86) ``` Where line 86 is "socket.connect(dest);"

Original source