[3952] | 1 | package nu.fw.jeti.plugins.filetransfer.socks5.jsocks; |
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| 2 | import java.net.*; |
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| 3 | import java.io.*; |
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| 4 | import java.util.Hashtable; |
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| 5 | import java.util.Enumeration; |
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| 6 | |
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| 7 | /** |
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| 8 | SOCKS5 Proxy. |
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| 9 | */ |
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| 10 | |
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| 11 | public class Socks5Proxy extends Proxy implements Cloneable{ |
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| 12 | |
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| 13 | //Data members |
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| 14 | private Hashtable authMethods = new Hashtable(); |
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| 15 | private int selectedMethod; |
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| 16 | |
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| 17 | boolean resolveAddrLocally = true; |
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| 18 | UDPEncapsulation udp_encapsulation=null; |
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| 19 | |
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| 20 | |
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| 21 | //Public Constructors |
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| 22 | //==================== |
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| 23 | |
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| 24 | /** |
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| 25 | Creates SOCKS5 proxy. |
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| 26 | @param p Proxy to use to connect to this proxy, allows proxy chaining. |
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| 27 | @param proxyHost Host on which a Proxy server runs. |
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| 28 | @param proxyPort Port on which a Proxy server listens for connections. |
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| 29 | @throws UnknownHostException If proxyHost can't be resolved. |
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| 30 | */ |
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| 31 | public Socks5Proxy(Proxy p,String proxyHost,int proxyPort) |
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| 32 | throws UnknownHostException{ |
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| 33 | super(p,proxyHost,proxyPort); |
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| 34 | version = 5; |
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| 35 | setAuthenticationMethod(0,new AuthenticationNone()); |
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| 36 | } |
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| 37 | |
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| 38 | /** |
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| 39 | Creates SOCKS5 proxy. |
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| 40 | @param proxyHost Host on which a Proxy server runs. |
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| 41 | @param proxyPort Port on which a Proxy server listens for connections. |
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| 42 | @throws UnknownHostException If proxyHost can't be resolved. |
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| 43 | */ |
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| 44 | public Socks5Proxy(String proxyHost,int proxyPort) |
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| 45 | throws UnknownHostException{ |
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| 46 | this(null,proxyHost,proxyPort); |
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| 47 | } |
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| 48 | |
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| 49 | |
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| 50 | /** |
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| 51 | Creates SOCKS5 proxy. |
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| 52 | @param p Proxy to use to connect to this proxy, allows proxy chaining. |
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| 53 | @param proxyIP Host on which a Proxy server runs. |
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| 54 | @param proxyPort Port on which a Proxy server listens for connections. |
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| 55 | */ |
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| 56 | public Socks5Proxy(Proxy p,InetAddress proxyIP,int proxyPort){ |
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| 57 | super(p,proxyIP,proxyPort); |
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| 58 | version = 5; |
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| 59 | setAuthenticationMethod(0,new AuthenticationNone()); |
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| 60 | } |
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| 61 | |
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| 62 | /** |
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| 63 | Creates SOCKS5 proxy. |
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| 64 | @param proxyIP Host on which a Proxy server runs. |
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| 65 | @param proxyPort Port on which a Proxy server listens for connections. |
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| 66 | */ |
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| 67 | public Socks5Proxy(InetAddress proxyIP,int proxyPort){ |
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| 68 | this(null,proxyIP,proxyPort); |
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| 69 | } |
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| 70 | |
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| 71 | //Public instance methods |
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| 72 | //======================== |
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| 73 | |
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| 74 | |
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| 75 | /** |
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| 76 | * Wether to resolve address locally or to let proxy do so. |
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| 77 | <p> |
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| 78 | SOCKS5 protocol allows to send host names rather then IPs in the |
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| 79 | requests, this option controls wether the hostnames should be send |
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| 80 | to the proxy server as names, or should they be resolved locally. |
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| 81 | @param doResolve Wether to perform resolution locally. |
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| 82 | @return Previous settings. |
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| 83 | */ |
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| 84 | public boolean resolveAddrLocally(boolean doResolve){ |
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| 85 | boolean old = resolveAddrLocally; |
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| 86 | resolveAddrLocally = doResolve; |
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| 87 | return old; |
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| 88 | } |
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| 89 | /** |
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| 90 | Get current setting on how the addresses should be handled. |
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| 91 | @return Current setting for address resolution. |
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| 92 | @see Socks5Proxy#resolveAddrLocally(boolean doResolve) |
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| 93 | */ |
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| 94 | public boolean resolveAddrLocally(){ |
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| 95 | return resolveAddrLocally; |
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| 96 | } |
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| 97 | |
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| 98 | /** |
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| 99 | Adds another authentication method. |
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| 100 | @param methodId Authentication method id, see rfc1928 |
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| 101 | @param method Implementation of Authentication |
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| 102 | @see Authentication |
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| 103 | */ |
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| 104 | public boolean setAuthenticationMethod(int methodId, |
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| 105 | Authentication method){ |
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| 106 | if(methodId<0 || methodId > 255) |
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| 107 | return false; |
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| 108 | if(method == null){ |
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| 109 | //Want to remove a particular method |
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| 110 | return (authMethods.remove(new Integer(methodId)) != null); |
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| 111 | }else{//Add the method, or rewrite old one |
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| 112 | authMethods.put(new Integer(methodId),method); |
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| 113 | } |
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| 114 | return true; |
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| 115 | } |
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| 116 | |
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| 117 | /** |
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| 118 | Get authentication method, which corresponds to given method id |
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| 119 | @param methodId Authentication method id. |
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| 120 | @return Implementation for given method or null, if one was not set. |
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| 121 | */ |
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| 122 | public Authentication getAuthenticationMethod(int methodId){ |
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| 123 | Object method = authMethods.get(new Integer(methodId)); |
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| 124 | if(method == null) return null; |
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| 125 | return (Authentication)method; |
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| 126 | } |
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| 127 | |
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| 128 | /** |
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| 129 | Creates a clone of this Proxy. |
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| 130 | */ |
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| 131 | public Object clone(){ |
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| 132 | Socks5Proxy newProxy = new Socks5Proxy(proxyIP,proxyPort); |
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| 133 | newProxy.authMethods = (Hashtable) this.authMethods.clone(); |
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| 134 | newProxy.directHosts = (InetRange)directHosts.clone(); |
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| 135 | newProxy.resolveAddrLocally = resolveAddrLocally; |
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| 136 | newProxy.chainProxy = chainProxy; |
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| 137 | return newProxy; |
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| 138 | } |
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| 139 | |
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| 140 | //Public Static(Class) Methods |
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| 141 | //============================== |
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| 142 | |
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| 143 | |
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| 144 | //Protected Methods |
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| 145 | //================= |
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| 146 | |
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| 147 | protected Proxy copy(){ |
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| 148 | Socks5Proxy copy = new Socks5Proxy(proxyIP,proxyPort); |
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| 149 | copy.authMethods = this.authMethods; //same Hash, no copy |
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| 150 | copy.directHosts = this.directHosts; |
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| 151 | copy.chainProxy = this.chainProxy; |
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| 152 | copy.resolveAddrLocally = this.resolveAddrLocally; |
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| 153 | return copy; |
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| 154 | } |
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| 155 | /** |
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| 156 | * |
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| 157 | * |
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| 158 | */ |
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| 159 | protected void startSession()throws SocksException{ |
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| 160 | super.startSession(); |
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| 161 | Authentication auth; |
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| 162 | Socket ps = proxySocket; //The name is too long |
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| 163 | |
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| 164 | try{ |
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| 165 | |
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| 166 | byte nMethods = (byte) authMethods.size(); //Number of methods |
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| 167 | |
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| 168 | byte[] buf = new byte[2+nMethods]; //2 is for VER,NMETHODS |
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| 169 | buf[0] = (byte) version; |
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| 170 | buf[1] = nMethods; //Number of methods |
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| 171 | int i=2; |
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| 172 | |
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| 173 | Enumeration ids = authMethods.keys(); |
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| 174 | while(ids.hasMoreElements()) |
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| 175 | buf[i++] = (byte)((Integer)ids.nextElement()).intValue(); |
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| 176 | |
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| 177 | out.write(buf); |
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| 178 | out.flush(); |
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| 179 | |
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| 180 | int versionNumber = in.read(); |
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| 181 | selectedMethod = in.read(); |
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| 182 | |
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| 183 | if(versionNumber < 0 || selectedMethod < 0){ |
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| 184 | //EOF condition was reached |
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| 185 | endSession(); |
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| 186 | throw(new SocksException(SOCKS_PROXY_IO_ERROR, |
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| 187 | "Connection to proxy lost.")); |
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| 188 | } |
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| 189 | if(versionNumber < version){ |
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| 190 | //What should we do?? |
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| 191 | } |
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| 192 | if(selectedMethod == 0xFF){ //No method selected |
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| 193 | ps.close(); |
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| 194 | throw ( new SocksException(SOCKS_AUTH_NOT_SUPPORTED)); |
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| 195 | } |
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| 196 | |
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| 197 | auth = getAuthenticationMethod(selectedMethod); |
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| 198 | if(auth == null){ |
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| 199 | //This shouldn't happen, unless method was removed by other |
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| 200 | //thread, or the server stuffed up |
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| 201 | throw(new SocksException(SOCKS_JUST_ERROR, |
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| 202 | "Speciefied Authentication not found!")); |
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| 203 | } |
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| 204 | Object[] in_out = auth.doSocksAuthentication(selectedMethod,ps); |
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| 205 | if(in_out == null){ |
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| 206 | //Authentication failed by some reason |
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| 207 | throw(new SocksException(SOCKS_AUTH_FAILURE)); |
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| 208 | } |
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| 209 | //Most authentication methods are expected to return |
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| 210 | //simply the input/output streams associated with |
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| 211 | //the socket. However if the auth. method requires |
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| 212 | //some kind of encryption/decryption being done on the |
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| 213 | //connection it should provide classes to handle I/O. |
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| 214 | |
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| 215 | in = (InputStream) in_out[0]; |
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| 216 | out = (OutputStream) in_out[1]; |
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| 217 | if(in_out.length > 2) |
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| 218 | udp_encapsulation = (UDPEncapsulation) in_out[2]; |
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| 219 | |
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| 220 | }catch(SocksException s_ex){ |
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| 221 | throw s_ex; |
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| 222 | }catch(UnknownHostException uh_ex){ |
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| 223 | throw(new SocksException(SOCKS_PROXY_NO_CONNECT)); |
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| 224 | }catch(SocketException so_ex){ |
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| 225 | throw(new SocksException(SOCKS_PROXY_NO_CONNECT)); |
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| 226 | }catch(IOException io_ex){ |
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| 227 | //System.err.println(io_ex); |
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| 228 | throw(new SocksException(SOCKS_PROXY_IO_ERROR,""+io_ex)); |
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| 229 | } |
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| 230 | } |
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| 231 | |
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| 232 | protected ProxyMessage formMessage(int cmd,InetAddress ip,int port){ |
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| 233 | return new Socks5Message(cmd,ip,port); |
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| 234 | } |
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| 235 | protected ProxyMessage formMessage(int cmd,String host,int port) |
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| 236 | throws UnknownHostException{ |
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| 237 | //if(resolveAddrLocally) |
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| 238 | // return formMessage(cmd,InetAddress.getByName(host),port); |
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| 239 | //else |
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| 240 | return new Socks5Message(cmd,host,port); |
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| 241 | } |
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| 242 | protected ProxyMessage formMessage(InputStream in) |
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| 243 | throws SocksException, |
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| 244 | IOException{ |
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| 245 | return new Socks5Message(in); |
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| 246 | } |
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| 247 | |
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| 248 | } |
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