SOCKS.java

package uc.protocol;


import java.util.*;
import java.io.*;
import java.net.*;
import socks.server.*;
import socks.*;
import socks.Proxy;

public class SOCKS{

	public static void usage(){
      System.out.println(
      "Usage: java SOCKS [inifile1 inifile2 ...]\n"+
      "If none inifile is given, uses socks.properties.\n"
      );
   }

   public static void main(String[] args){

      String[] file_names;
      int port=1080;
      String logFile = null;
      String host = null;

      IdentAuthenticator auth = new IdentAuthenticator();
      OutputStream log = null;
      InetAddress localIP = null;

      if(args.length == 0){
         file_names = new String[1];
         file_names[0] = "socks.properties";
      }else{
         file_names = args;
      }


      inform("Loading properties");
      for(int i=0;i<file_names.length;++i){

         inform("Reading file "+file_names[i]);

         Properties pr = loadProperties(file_names[i]);
         if(pr==null){
           System.err.println("Loading of properties from "+
                               file_names[i]+"failed.");
           usage();
           return;
         }
         if(!addAuth(auth,pr)){
           System.err.println("Error in file "+file_names[i]+".");
           usage();
           return;
         }
         //First file should contain all global settings,
         // like port and host and log.
         if(i==0){
           String port_s = (String) pr.get("port");
           if(port_s != null)
              try{
                port = Integer.parseInt(port_s);
              }catch(NumberFormatException nfe){
                System.err.println("Can't parse port: "+port_s);
                return;
              }

           serverInit(pr);
           logFile = (String) pr.get("log");
           host = (String) pr.get("host");
         }
         
         //inform("Props:"+pr);
      }

      if(logFile!=null){
        if(logFile.equals("-"))
           log = System.out;
        else
           try{
             log = new FileOutputStream(logFile);
           }catch(IOException ioe){
             System.err.println("Can't open log file "+logFile);
             return;
           }
      }
      if(host!=null)
         try{
           localIP = InetAddress.getByName(host);
         }catch(UnknownHostException uhe){
           System.err.println("Can't resolve local ip: "+host);
           return;
         }


      inform("Using Ident Authentication scheme:\n"+auth+"\n");
      ProxyServer server = new ProxyServer(auth);
      ProxyServer.setLog(log);
      server.start(port,5,localIP);
   }

   static Properties loadProperties(String file_name){

      Properties pr = new Properties();

      try{
         InputStream fin = new FileInputStream(file_name);
         pr.load(fin);
         fin.close();
      }catch(IOException ioe){
         return null;
      }
      return pr;
   }


   static boolean addAuth(IdentAuthenticator ident,Properties pr){

      InetRange irange;

      String range = (String) pr.get("range");
      if(range == null) return false;
      irange = parseInetRange(range);


      String users = (String) pr.get("users");

      if(users == null){
         ident.add(irange,null);
         return true;
      }

      Hashtable<String, String> uhash = new Hashtable<String, String>();

      StringTokenizer st = new StringTokenizer(users,";");
      while(st.hasMoreTokens())
         uhash.put(st.nextToken(),"");

      ident.add(irange,uhash);
      return true;
   }

   /**
     Does server initialisation. 
   */
   static void serverInit(Properties props){
      int val;
      val = readInt(props,"iddleTimeout");
      if(val>=0){ 
        ProxyServer.setIddleTimeout(val);
        inform("Setting iddle timeout to "+val+" ms.");
      }
      val = readInt(props,"acceptTimeout");
      if(val>=0){
        ProxyServer.setAcceptTimeout(val);
        inform("Setting accept timeout to "+val+" ms.");
      }
      val = readInt(props,"udpTimeout");
      if(val>=0){
        ProxyServer.setUDPTimeout(val);
        inform("Setting udp timeout to "+val+" ms.");
      }

      val = readInt(props,"datagramSize");
      if(val>=0){
        ProxyServer.setDatagramSize(val);
        inform("Setting datagram size to "+val+" bytes.");
      }

      proxyInit(props);

   }

   /**
     Initialises proxy, if any specified.
   */
   static void proxyInit(Properties props){
      String proxy_list;
      Proxy proxy = null;
      StringTokenizer st;

      proxy_list = (String) props.get("proxy");
      if(proxy_list == null) return;

      st = new StringTokenizer(proxy_list,";");
      while(st.hasMoreTokens()){
         String proxy_entry = st.nextToken();

         Proxy p = Proxy.parseProxy(proxy_entry);

         if(p == null)
            exit("Can't parse proxy entry:"+proxy_entry);
        

         inform("Adding Proxy:"+p);

         if(proxy != null) 
            p.setChainProxy(proxy);

         proxy = p;

      }
      if(proxy == null) return;  //Empty list

      String direct_hosts = (String) props.get("directHosts");
      if(direct_hosts!=null){
        InetRange ir = parseInetRange(direct_hosts);
        inform("Setting direct hosts:"+ir);
        proxy.setDirect(ir);
      }


      ProxyServer.setProxy(proxy);
   }
   /**
     Inits range from the string of semicolon separated ranges.
   */
   static InetRange parseInetRange(String source){
      InetRange irange = new InetRange();

      StringTokenizer st = new StringTokenizer(source,";");
      while(st.hasMoreTokens())
        irange.add(st.nextToken());

      return irange;
   }

   /**
    Integer representaion of the property named name, or -1 if one
    is not found.
   */
   static int readInt(Properties props,String name){
      int result = -1;
      String val = (String) props.get(name);
      if(val==null) return -1;
      StringTokenizer st = new StringTokenizer(val);
      if(!st.hasMoreElements()) return -1;
      try{
        result = Integer.parseInt(st.nextToken());
      }catch(NumberFormatException nfe){
        inform("Bad value for "+name+":"+val);
      }
      return result;
   }

//Display functions
///////////////////

   static void inform(String s){
      System.out.println(s);
   }

   static void exit(String msg){
      System.err.println("Error:"+msg);
      System.err.println("Aborting operation");
      System.exit(0);
   }
}