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The source code is released under:
GNU Lesser General Public License
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package net.sourceforge.jsocks.socks; /*from w w w . j av a 2 s .c o m*/ import java.net.*; import java.io.*; /** Abstract class Proxy, base for classes Socks4Proxy and Socks5Proxy. Defines methods for specifying default proxy, to be used by all classes of this package. */ public abstract class Proxy{ //Data members protected InetRange directHosts = new InetRange(); protected InetAddress proxyIP = null; protected String proxyHost = null; protected int proxyPort; protected Socket proxySocket = null; protected InputStream in; protected OutputStream out; protected int version; protected Proxy chainProxy = null; protected int localSocketPort = 0; protected int localSocketPortAssigned; //Protected static/class variables protected static Proxy defaultProxy = null; //Constructors //==================== Proxy(Proxy chainProxy, String proxyHost,int proxyPort)throws UnknownHostException{ this.chainProxy = chainProxy; this.proxyHost = proxyHost; if(chainProxy == null) this.proxyIP = InetAddress.getByName(proxyHost); this.proxyPort = proxyPort; } Proxy(String proxyHost,int proxyPort)throws UnknownHostException{ this(null,proxyHost,proxyPort); } Proxy(Proxy chainProxy,InetAddress proxyIP,int proxyPort){ this.chainProxy = chainProxy; this.proxyIP = proxyIP; this.proxyPort = proxyPort; } Proxy(InetAddress proxyIP,int proxyPort){ this(null,proxyIP,proxyPort); } Proxy(Proxy p){ this.proxyIP = p.proxyIP; this.proxyPort = p.proxyPort; this.version = p.version; this.directHosts = p.directHosts; } //Public instance methods //======================== /** Get the port on which proxy server is running. * @return Proxy port. */ public int getPort(){ return proxyPort; } /** Get the ip address of the proxy server host. * @return Proxy InetAddress. */ public InetAddress getInetAddress(){ return proxyIP; } /** * Adds given ip to the list of direct addresses. * This machine will be accessed without using proxy. */ public void addDirect(InetAddress ip){ directHosts.add(ip); } /** * Adds host to the list of direct addresses. * This machine will be accessed without using proxy. */ public boolean addDirect(String host){ return directHosts.add(host); } /** * Adds given range of addresses to the lsit of direct addresses, * machines within this range will be accessed without using proxy. */ public void addDirect(InetAddress from,InetAddress to){ directHosts.add(from,to); } /** * Sets given InetRange as the list of direct address, previous * list will be discarded, any changes done previously with * addDirect(Inetaddress) will be lost. * The machines in this range will be accessed without using proxy. * @param ir InetRange which should be used to look up direct addresses. * @see InetRange */ public void setDirect(InetRange ir){ directHosts = ir; } /** Get the list of direct hosts. * @return Current range of direct address as InetRange object. * @see InetRange */ public InetRange getDirect(){ return directHosts; } /** Check wether the given host is on the list of direct address. @param host Host name to check. * @return true if the given host is specified as the direct addresses. */ public boolean isDirect(String host){ return directHosts.contains(host); } /** Check wether the given host is on the list of direct addresses. @param host Host address to check. * @return true if the given host is specified as the direct address. */ public boolean isDirect(InetAddress host){ return directHosts.contains(host); } /** Set the proxy which should be used to connect to given proxy. @param chainProxy Proxy to use to connect to this proxy. */ public void setChainProxy(Proxy chainProxy){ this.chainProxy = chainProxy; } /** Get proxy which is used to connect to this proxy. @return Proxy which is used to connect to this proxy, or null if proxy is to be contacted directly. */ public Proxy getChainProxy(){ return chainProxy; } /** Get string representation of this proxy. * @returns string in the form:proxyHost:proxyPort \t Version versionNumber */ public String toString(){ return (""+proxyIP.getHostName()+":"+proxyPort+"\tVersion "+version); } //Public Static(Class) Methods //============================== /** * Sets SOCKS4 proxy as default. @param hostName Host name on which SOCKS4 server is running. @param port Port on which SOCKS4 server is running. @param user Username to use for communications with proxy. */ public static void setDefaultProxy(String hostName,int port,String user) throws UnknownHostException{ defaultProxy = new Socks4Proxy(hostName,port,user); } /** * Sets SOCKS4 proxy as default. @param ipAddress Host address on which SOCKS4 server is running. @param port Port on which SOCKS4 server is running. @param user Username to use for communications with proxy. */ public static void setDefaultProxy(InetAddress ipAddress,int port, String user){ defaultProxy = new Socks4Proxy(ipAddress,port,user); } /** * Sets SOCKS5 proxy as default. * Default proxy only supports no-authentication. @param hostName Host name on which SOCKS5 server is running. @param port Port on which SOCKS5 server is running. */ public static void setDefaultProxy(String hostName,int port) throws UnknownHostException{ defaultProxy = new Socks5Proxy(hostName,port); } /** * Sets SOCKS5 proxy as default. * Default proxy only supports no-authentication. @param ipAddress Host address on which SOCKS5 server is running. @param port Port on which SOCKS5 server is running. */ public static void setDefaultProxy(InetAddress ipAddress,int port){ defaultProxy = new Socks5Proxy(ipAddress,port); } /** * Sets default proxy. @param p Proxy to use as default proxy. */ public static void setDefaultProxy(Proxy p){ defaultProxy = p; } /** Get current default proxy. * @return Current default proxy, or null if none is set. */ public static Proxy getDefaultProxy(){ return defaultProxy; } /** Parses strings in the form: host[:port:user:password], and creates proxy from information obtained from parsing. <p> Defaults: port = 1080.<br> If user specified but not password, creates Socks4Proxy, if user not specified creates Socks5Proxy, if both user and password are speciefied creates Socks5Proxy with user/password authentication. @param proxy_entry String in the form host[:port:user:password] @return Proxy created from the string, null if entry was somehow invalid(host unknown for example, or empty string) */ public static Proxy parseProxy(String proxy_entry){ String proxy_host; int proxy_port = 1080; String proxy_user = null; String proxy_password = null; Proxy proxy; java.util.StringTokenizer st = new java.util.StringTokenizer( proxy_entry,":"); if(st.countTokens() < 1) return null; proxy_host = st.nextToken(); if(st.hasMoreTokens()) try{ proxy_port = Integer.parseInt(st.nextToken().trim()); }catch(NumberFormatException nfe){} if(st.hasMoreTokens()) proxy_user = st.nextToken(); if(st.hasMoreTokens()) proxy_password = st.nextToken(); try{ if(proxy_user == null) proxy = new Socks5Proxy(proxy_host,proxy_port); else if(proxy_password == null) proxy = new Socks4Proxy(proxy_host,proxy_port,proxy_user); else{ proxy = new Socks5Proxy(proxy_host,proxy_port); UserPasswordAuthentication upa = new UserPasswordAuthentication( proxy_user, proxy_password); ((Socks5Proxy)proxy).setAuthenticationMethod(upa.METHOD_ID,upa); } }catch(UnknownHostException uhe){ return null; } return proxy; } public int getLocalSocketPort() { return localSocketPortAssigned; } //Protected Methods //================= protected void startSession()throws SocksException{ try{ if(chainProxy == null) { if (localSocketPort > 0) { proxySocket = new Socket(proxyIP, proxyPort, InetAddress.getLocalHost(), localSocketPort); } else { proxySocket = new Socket(proxyIP, proxyPort); } localSocketPortAssigned = proxySocket.getLocalPort(); } else if(proxyIP != null) proxySocket = new SocksSocket(chainProxy,proxyIP,proxyPort); else proxySocket = new SocksSocket(chainProxy,proxyHost,proxyPort); in = proxySocket.getInputStream(); out = proxySocket.getOutputStream(); }catch(SocksException se){ throw se; }catch(IOException io_ex){ throw new SocksException(SOCKS_PROXY_IO_ERROR,""+io_ex); } } protected abstract Proxy copy(); protected abstract ProxyMessage formMessage(int cmd,InetAddress ip,int port); protected abstract ProxyMessage formMessage(int cmd,String host,int port) throws UnknownHostException; protected abstract ProxyMessage formMessage(InputStream in) throws SocksException, IOException; protected ProxyMessage connect(InetAddress ip,int port) throws SocksException{ try{ startSession(); ProxyMessage request = formMessage(SOCKS_CMD_CONNECT, ip,port); return exchange(request); }catch(SocksException se){ endSession(); throw se; } } protected ProxyMessage connect(String host,int port) throws UnknownHostException,SocksException{ try{ startSession(); ProxyMessage request = formMessage(SOCKS_CMD_CONNECT, host,port); return exchange(request); }catch(SocksException se){ endSession(); throw se; } } protected ProxyMessage bind(InetAddress ip,int port) throws SocksException{ try{ startSession(); ProxyMessage request = formMessage(SOCKS_CMD_BIND, ip,port); return exchange(request); }catch(SocksException se){ endSession(); throw se; } } protected ProxyMessage bind(String host,int port) throws UnknownHostException,SocksException{ try{ startSession(); ProxyMessage request = formMessage(SOCKS_CMD_BIND, host,port); return exchange(request); }catch(SocksException se){ endSession(); throw se; } } protected ProxyMessage accept() throws IOException,SocksException{ ProxyMessage msg; try{ msg = formMessage(in); }catch(InterruptedIOException iioe){ throw iioe; }catch(IOException io_ex){ endSession(); throw new SocksException(SOCKS_PROXY_IO_ERROR,"While Trying accept:" +io_ex); } return msg; } protected ProxyMessage udpAssociate(InetAddress ip,int port) throws SocksException{ try{ startSession(); ProxyMessage request = formMessage(SOCKS_CMD_UDP_ASSOCIATE, ip,port); if(request != null) return exchange(request); }catch(SocksException se){ endSession(); throw se; } //Only get here if request was null endSession(); throw new SocksException(SOCKS_METHOD_NOTSUPPORTED, "This version of proxy does not support UDP associate, use version 5"); } protected ProxyMessage udpAssociate(String host,int port) throws UnknownHostException,SocksException{ try{ startSession(); ProxyMessage request = formMessage(SOCKS_CMD_UDP_ASSOCIATE, host,port); if(request != null) return exchange(request); }catch(SocksException se){ endSession(); throw se; } //Only get here if request was null endSession(); throw new SocksException(SOCKS_METHOD_NOTSUPPORTED, "This version of proxy does not support UDP associate, use version 5"); } protected void endSession(){ try{ if(proxySocket!=null) proxySocket.close(); proxySocket = null; }catch(IOException io_ex){ } } /** *Sends the request to SOCKS server */ protected void sendMsg(ProxyMessage msg)throws SocksException, IOException{ msg.write(out); } /** * Reads the reply from the SOCKS server */ protected ProxyMessage readMsg()throws SocksException, IOException{ return formMessage(in); } /** *Sends the request reads reply and returns it *throws exception if something wrong with IO *or the reply code is not zero */ protected ProxyMessage exchange(ProxyMessage request) throws SocksException{ ProxyMessage reply; try{ request.write(out); reply = formMessage(in); }catch(SocksException s_ex){ throw s_ex; }catch(IOException ioe){ throw(new SocksException(SOCKS_PROXY_IO_ERROR,""+ioe)); } return reply; } //Private methods //=============== //Constants public static final int SOCKS_SUCCESS =0; public static final int SOCKS_FAILURE =1; public static final int SOCKS_NOT_ALLOWED_BY_RULESET =2; public static final int SOCKS_BADNETWORK =3; public static final int SOCKS_HOST_UNREACHABLE =4; public static final int SOCKS_CONNECTION_REFUSED =5; public static final int SOCKS_TTL_EXPIRE =6; public static final int SOCKS_CMD_NOT_SUPPORTED =7; public static final int SOCKS_ADDR_NOT_SUPPORTED =8; public static final int SOCKS_NO_PROXY =1<<16; public static final int SOCKS_PROXY_NO_CONNECT =2<<16; public static final int SOCKS_PROXY_IO_ERROR =3<<16; public static final int SOCKS_AUTH_NOT_SUPPORTED =4<<16; public static final int SOCKS_AUTH_FAILURE =5<<16; public static final int SOCKS_JUST_ERROR =6<<16; public static final int SOCKS_DIRECT_FAILED =7<<16; public static final int SOCKS_METHOD_NOTSUPPORTED =8<<16; static final int SOCKS_CMD_CONNECT =0x1; static final int SOCKS_CMD_BIND =0x2; static final int SOCKS_CMD_UDP_ASSOCIATE =0x3; }