[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 | |
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| 5 | /** |
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| 6 | Datagram socket to interract through the firewall.<BR> |
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| 7 | Can be used same way as the normal DatagramSocket. One should |
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| 8 | be carefull though with the datagram sizes used, as additional data |
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| 9 | is present in both incomming and outgoing datagrams. |
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| 10 | <p> |
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| 11 | SOCKS5 protocol allows to send host address as either: |
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| 12 | <ul> |
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| 13 | <li> IPV4, normal 4 byte address. (10 bytes header size) |
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| 14 | <li> IPV6, version 6 ip address (not supported by Java as for now). |
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| 15 | 22 bytes header size. |
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| 16 | <li> Host name,(7+length of the host name bytes header size). |
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| 17 | </ul> |
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| 18 | As with other Socks equivalents, direct addresses are handled |
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| 19 | transparently, that is data will be send directly when required |
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| 20 | by the proxy settings. |
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| 21 | <p> |
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| 22 | <b>NOTE:</b><br> |
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| 23 | Unlike other SOCKS Sockets, it <b>does not</b> support proxy chaining, |
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| 24 | and will throw an exception if proxy has a chain proxy attached. The |
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| 25 | reason for that is not my laziness, but rather the restrictions of |
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| 26 | the SOCKSv5 protocol. Basicaly SOCKSv5 proxy server, needs to know from |
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| 27 | which host:port datagrams will be send for association, and returns address |
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| 28 | to which datagrams should be send by the client, but it does not |
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| 29 | inform client from which host:port it is going to send datagrams, in fact |
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| 30 | there is even no guarantee they will be send at all and from the same address |
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| 31 | each time. |
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| 32 | |
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| 33 | */ |
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| 34 | public class Socks5DatagramSocket extends DatagramSocket{ |
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| 35 | |
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| 36 | InetAddress relayIP; |
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| 37 | int relayPort; |
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| 38 | Socks5Proxy proxy; |
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| 39 | private boolean server_mode = false; |
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| 40 | UDPEncapsulation encapsulation; |
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| 41 | |
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| 42 | |
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| 43 | /** |
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| 44 | Construct Datagram socket for communication over SOCKS5 proxy |
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| 45 | server. This constructor uses default proxy, the one set with |
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| 46 | Proxy.setDefaultProxy() method. If default proxy is not set or |
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| 47 | it is set to version4 proxy, which does not support datagram |
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| 48 | forwarding, throws SocksException. |
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| 49 | |
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| 50 | */ |
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| 51 | public Socks5DatagramSocket() throws SocksException, |
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| 52 | IOException{ |
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| 53 | this(Proxy.defaultProxy,0,null); |
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| 54 | } |
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| 55 | /** |
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| 56 | Construct Datagram socket for communication over SOCKS5 proxy |
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| 57 | server. And binds it to the specified local port. |
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| 58 | This constructor uses default proxy, the one set with |
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| 59 | Proxy.setDefaultProxy() method. If default proxy is not set or |
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| 60 | it is set to version4 proxy, which does not support datagram |
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| 61 | forwarding, throws SocksException. |
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| 62 | */ |
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| 63 | public Socks5DatagramSocket(int port) throws SocksException, |
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| 64 | IOException{ |
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| 65 | this(Proxy.defaultProxy,port,null); |
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| 66 | } |
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| 67 | /** |
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| 68 | Construct Datagram socket for communication over SOCKS5 proxy |
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| 69 | server. And binds it to the specified local port and address. |
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| 70 | This constructor uses default proxy, the one set with |
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| 71 | Proxy.setDefaultProxy() method. If default proxy is not set or |
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| 72 | it is set to version4 proxy, which does not support datagram |
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| 73 | forwarding, throws SocksException. |
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| 74 | */ |
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| 75 | public Socks5DatagramSocket(int port,InetAddress ip) throws SocksException, |
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| 76 | IOException{ |
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| 77 | this(Proxy.defaultProxy,port,ip); |
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| 78 | } |
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| 79 | |
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| 80 | /** |
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| 81 | Constructs datagram socket for communication over specified proxy. |
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| 82 | And binds it to the given local address and port. Address of null |
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| 83 | and port of 0, signify any availabale port/address. |
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| 84 | Might throw SocksException, if: |
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| 85 | <ol> |
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| 86 | <li> Given version of proxy does not support UDP_ASSOCIATE. |
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| 87 | <li> Proxy can't be reached. |
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| 88 | <li> Authorization fails. |
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| 89 | <li> Proxy does not want to perform udp forwarding, for any reason. |
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| 90 | </ol> |
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| 91 | Might throw IOException if binding dtagram socket to given address/port |
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| 92 | fails. |
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| 93 | See java.net.DatagramSocket for more details. |
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| 94 | */ |
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| 95 | public Socks5DatagramSocket(Proxy p,int port,InetAddress ip) |
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| 96 | throws SocksException, |
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| 97 | IOException{ |
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| 98 | super(port,ip); |
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| 99 | if(p == null) throw new SocksException(Proxy.SOCKS_NO_PROXY); |
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| 100 | if(!(p instanceof Socks5Proxy)) |
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| 101 | throw new SocksException(-1,"Datagram Socket needs Proxy version 5"); |
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| 102 | |
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| 103 | if(p.chainProxy != null) |
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| 104 | throw new SocksException(Proxy.SOCKS_JUST_ERROR, |
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| 105 | "Datagram Sockets do not support proxy chaining."); |
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| 106 | |
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| 107 | proxy =(Socks5Proxy) p.copy(); |
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| 108 | |
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| 109 | ProxyMessage msg = proxy.udpAssociate(super.getLocalAddress(), |
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| 110 | super.getLocalPort()); |
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| 111 | relayIP = msg.ip; |
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| 112 | if(relayIP.getHostAddress().equals("0.0.0.0")) relayIP = proxy.proxyIP; |
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| 113 | relayPort = msg.port; |
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| 114 | |
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| 115 | encapsulation = proxy.udp_encapsulation; |
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| 116 | |
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| 117 | //debug("Datagram Socket:"+getLocalAddress()+":"+getLocalPort()+"\n"); |
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| 118 | //debug("Socks5Datagram: "+relayIP+":"+relayPort+"\n"); |
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| 119 | } |
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| 120 | |
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| 121 | /** |
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| 122 | Used by UDPRelayServer. |
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| 123 | */ |
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| 124 | Socks5DatagramSocket(boolean server_mode,UDPEncapsulation encapsulation, |
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| 125 | InetAddress relayIP,int relayPort) |
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| 126 | throws IOException{ |
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| 127 | super(); |
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| 128 | this.server_mode = server_mode; |
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| 129 | this.relayIP = relayIP; |
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| 130 | this.relayPort = relayPort; |
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| 131 | this.encapsulation = encapsulation; |
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| 132 | this.proxy = null; |
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| 133 | } |
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| 134 | |
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| 135 | /** |
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| 136 | Sends the Datagram either through the proxy or directly depending |
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| 137 | on current proxy settings and destination address. <BR> |
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| 138 | |
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| 139 | <B> NOTE: </B> DatagramPacket size should be at least 10 bytes less |
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| 140 | than the systems limit. |
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| 141 | |
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| 142 | <P> |
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| 143 | See documentation on java.net.DatagramSocket |
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| 144 | for full details on how to use this method. |
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| 145 | @param dp Datagram to send. |
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| 146 | @throws IOException If error happens with I/O. |
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| 147 | */ |
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| 148 | public void send(DatagramPacket dp) throws IOException{ |
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| 149 | //If the host should be accessed directly, send it as is. |
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| 150 | if(!server_mode && proxy.isDirect(dp.getAddress())){ |
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| 151 | super.send(dp); |
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| 152 | //debug("Sending directly:"); |
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| 153 | return; |
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| 154 | } |
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| 155 | |
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| 156 | byte[] head = formHeader(dp.getAddress(),dp.getPort()); |
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| 157 | byte[] buf = new byte[head.length + dp.getLength()]; |
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| 158 | byte[] data = dp.getData(); |
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| 159 | //Merge head and data |
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| 160 | System.arraycopy(head,0,buf,0,head.length); |
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| 161 | //System.arraycopy(data,dp.getOffset(),buf,head.length,dp.getLength()); |
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| 162 | System.arraycopy(data,0,buf,head.length,dp.getLength()); |
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| 163 | |
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| 164 | if(encapsulation != null) |
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| 165 | buf = encapsulation.udpEncapsulate(buf,true); |
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| 166 | |
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| 167 | super.send(new DatagramPacket(buf,buf.length,relayIP,relayPort)); |
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| 168 | } |
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| 169 | /** |
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| 170 | This method allows to send datagram packets with address type DOMAINNAME. |
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| 171 | SOCKS5 allows to specify host as names rather than ip addresses.Using |
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| 172 | this method one can send udp datagrams through the proxy, without having |
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| 173 | to know the ip address of the destination host. |
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| 174 | <p> |
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| 175 | If proxy specified for that socket has an option resolveAddrLocally set |
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| 176 | to true host will be resolved, and the datagram will be send with address |
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| 177 | type IPV4, if resolve fails, UnknownHostException is thrown. |
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| 178 | @param dp Datagram to send, it should contain valid port and data |
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| 179 | @param host Host name to which datagram should be send. |
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| 180 | @throws IOException If error happens with I/O, or the host can't be |
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| 181 | resolved when proxy settings say that hosts should be resolved locally. |
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| 182 | @see Socks5Proxy#resolveAddrLocally(boolean) |
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| 183 | */ |
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| 184 | public void send(DatagramPacket dp, String host) throws IOException{ |
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| 185 | if(proxy.isDirect(host)){ |
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| 186 | dp.setAddress(InetAddress.getByName(host)); |
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| 187 | super.send(dp); |
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| 188 | return; |
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| 189 | } |
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| 190 | |
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| 191 | if(((Socks5Proxy)proxy).resolveAddrLocally){ |
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| 192 | dp.setAddress(InetAddress.getByName(host)); |
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| 193 | } |
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| 194 | |
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| 195 | byte[] head = formHeader(host,dp.getPort()); |
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| 196 | byte[] buf = new byte[head.length + dp.getLength()]; |
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| 197 | byte[] data = dp.getData(); |
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| 198 | //Merge head and data |
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| 199 | System.arraycopy(head,0,buf,0,head.length); |
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| 200 | //System.arraycopy(data,dp.getOffset(),buf,head.length,dp.getLength()); |
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| 201 | System.arraycopy(data,0,buf,head.length,dp.getLength()); |
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| 202 | |
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| 203 | if(encapsulation != null) |
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| 204 | buf = encapsulation.udpEncapsulate(buf,true); |
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| 205 | |
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| 206 | super.send(new DatagramPacket(buf,buf.length,relayIP,relayPort)); |
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| 207 | } |
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| 208 | |
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| 209 | /** |
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| 210 | * Receives udp packet. If packet have arrived from the proxy relay server, |
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| 211 | * it is processed and address and port of the packet are set to the |
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| 212 | * address and port of sending host.<BR> |
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| 213 | * If the packet arrived from anywhere else it is not changed.<br> |
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| 214 | * <B> NOTE: </B> DatagramPacket size should be at least 10 bytes bigger |
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| 215 | * than the largest packet you expect (this is for IPV4 addresses). |
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| 216 | * For hostnames and IPV6 it is even more. |
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| 217 | @param dp Datagram in which all relevent information will be copied. |
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| 218 | */ |
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| 219 | public void receive(DatagramPacket dp) throws IOException{ |
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| 220 | super.receive(dp); |
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| 221 | |
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| 222 | if(server_mode){ |
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| 223 | //Drop all datagrams not from relayIP/relayPort |
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| 224 | int init_length = dp.getLength(); |
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| 225 | int initTimeout = getSoTimeout(); |
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| 226 | long startTime = System.currentTimeMillis(); |
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| 227 | |
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| 228 | while(!relayIP.equals(dp.getAddress()) || |
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| 229 | relayPort != dp.getPort()){ |
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| 230 | |
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| 231 | //Restore datagram size |
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| 232 | dp.setLength(init_length); |
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| 233 | |
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| 234 | //If there is a non-infinit timeout on this socket |
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| 235 | //Make sure that it happens no matter how often unexpected |
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| 236 | //packets arrive. |
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| 237 | if(initTimeout != 0){ |
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| 238 | int newTimeout = initTimeout - (int)(System.currentTimeMillis() - |
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| 239 | startTime); |
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| 240 | if(newTimeout <= 0) throw new InterruptedIOException( |
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| 241 | "In Socks5DatagramSocket->receive()"); |
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| 242 | setSoTimeout(newTimeout); |
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| 243 | } |
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| 244 | |
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| 245 | super.receive(dp); |
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| 246 | } |
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| 247 | |
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| 248 | //Restore timeout settings |
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| 249 | if(initTimeout != 0) setSoTimeout(initTimeout); |
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| 250 | |
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| 251 | }else if(!relayIP.equals(dp.getAddress()) || |
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| 252 | relayPort != dp.getPort()) |
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| 253 | return; // Recieved direct packet |
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| 254 | //If the datagram is not from the relay server, return it it as is. |
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| 255 | |
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| 256 | byte[] data; |
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| 257 | data = dp.getData(); |
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| 258 | |
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| 259 | if(encapsulation != null) |
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| 260 | data = encapsulation.udpEncapsulate(data,false); |
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| 261 | |
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| 262 | int offset = 0; //Java 1.1 |
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| 263 | //int offset = dp.getOffset(); //Java 1.2 |
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| 264 | |
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| 265 | ByteArrayInputStream bIn = new ByteArrayInputStream(data,offset, |
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| 266 | dp.getLength()); |
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| 267 | |
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| 268 | |
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| 269 | ProxyMessage msg = new Socks5Message(bIn); |
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| 270 | dp.setPort(msg.port); |
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| 271 | dp.setAddress(msg.getInetAddress()); |
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| 272 | |
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| 273 | //what wasn't read by the Message is the data |
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| 274 | int data_length = bIn.available(); |
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| 275 | //Shift data to the left |
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| 276 | System.arraycopy(data,offset+dp.getLength()-data_length, |
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| 277 | data,offset,data_length); |
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| 278 | |
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| 279 | |
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| 280 | dp.setLength(data_length); |
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| 281 | } |
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| 282 | |
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| 283 | /** |
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| 284 | * Returns port assigned by the proxy, to which datagrams are relayed. |
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| 285 | * It is not the same port to which other party should send datagrams. |
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| 286 | @return Port assigned by socks server to which datagrams are send |
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| 287 | for association. |
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| 288 | */ |
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| 289 | public int getLocalPort(){ |
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| 290 | if(server_mode) return super.getLocalPort(); |
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| 291 | return relayPort; |
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| 292 | } |
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| 293 | /** |
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| 294 | * Address assigned by the proxy, to which datagrams are send for relay. |
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| 295 | * It is not necesseraly the same address, to which other party should send |
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| 296 | * datagrams. |
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| 297 | @return Address to which datagrams are send for association. |
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| 298 | */ |
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| 299 | public InetAddress getLocalAddress(){ |
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| 300 | if(server_mode) return super.getLocalAddress(); |
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| 301 | return relayIP; |
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| 302 | } |
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| 303 | |
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| 304 | /** |
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| 305 | * Closes datagram socket, and proxy connection. |
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| 306 | */ |
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| 307 | public void close(){ |
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| 308 | if(!server_mode) proxy.endSession(); |
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| 309 | super.close(); |
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| 310 | } |
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| 311 | |
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| 312 | /** |
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| 313 | This method checks wether proxy still runs udp forwarding service |
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| 314 | for this socket. |
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| 315 | <p> |
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| 316 | This methods checks wether the primary connection to proxy server |
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| 317 | is active. If it is, chances are that proxy continues to forward |
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| 318 | datagrams being send from this socket. If it was closed, most likely |
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| 319 | datagrams are no longer being forwarded by the server. |
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| 320 | <p> |
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| 321 | Proxy might decide to stop forwarding datagrams, in which case it |
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| 322 | should close primary connection. This method allows to check, wether |
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| 323 | this have been done. |
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| 324 | <p> |
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| 325 | You can specify timeout for which we should be checking EOF condition |
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| 326 | on the primary connection. Timeout is in milliseconds. Specifying 0 as |
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| 327 | timeout implies infinity, in which case method will block, until |
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| 328 | connection to proxy is closed or an error happens, and then return false. |
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| 329 | <p> |
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| 330 | One possible scenario is to call isProxyactive(0) in separate thread, |
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| 331 | and once it returned notify other threads about this event. |
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| 332 | |
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| 333 | @param timeout For how long this method should block, before returning. |
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| 334 | @return true if connection to proxy is active, false if eof or error |
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| 335 | condition have been encountered on the connection. |
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| 336 | */ |
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| 337 | public boolean isProxyAlive(int timeout){ |
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| 338 | if(server_mode) return false; |
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| 339 | if(proxy != null){ |
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| 340 | try{ |
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| 341 | proxy.proxySocket.setSoTimeout(timeout); |
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| 342 | |
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| 343 | int eof = proxy.in.read(); |
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| 344 | if(eof < 0) return false; // EOF encountered. |
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| 345 | else return true; // This really should not happen |
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| 346 | |
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| 347 | }catch(InterruptedIOException iioe){ |
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| 348 | return true; // read timed out. |
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| 349 | }catch(IOException ioe){ |
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| 350 | return false; |
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| 351 | } |
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| 352 | } |
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| 353 | return false; |
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| 354 | } |
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| 355 | |
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| 356 | //PRIVATE METHODS |
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| 357 | ////////////////// |
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| 358 | |
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| 359 | |
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| 360 | private byte[] formHeader(InetAddress ip, int port){ |
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| 361 | Socks5Message request = new Socks5Message(0,ip,port); |
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| 362 | request.data[0] = 0; |
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| 363 | return request.data; |
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| 364 | } |
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| 365 | |
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| 366 | |
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| 367 | private byte[] formHeader(String host,int port){ |
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| 368 | Socks5Message request = new Socks5Message(0,host,port); |
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| 369 | request.data[0] = 0; |
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| 370 | return request.data; |
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| 371 | } |
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| 372 | |
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| 373 | |
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| 374 | /*====================================================================== |
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| 375 | |
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| 376 | //Mainly Test functions |
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| 377 | ////////////////////// |
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| 378 | |
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| 379 | private String bytes2String(byte[] b){ |
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| 380 | String s=""; |
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| 381 | char[] hex_digit = { '0','1','2','3','4','5','6','7','8','9', |
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| 382 | 'A','B','C','D','E','F'}; |
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| 383 | for(int i=0;i<b.length;++i){ |
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| 384 | int i1 = (b[i] & 0xF0) >> 4; |
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| 385 | int i2 = b[i] & 0xF; |
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| 386 | s+=hex_digit[i1]; |
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| 387 | s+=hex_digit[i2]; |
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| 388 | s+=" "; |
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| 389 | } |
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| 390 | return s; |
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| 391 | } |
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| 392 | private static final void debug(String s){ |
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| 393 | if(DEBUG) |
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| 394 | System.out.print(s); |
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| 395 | } |
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| 396 | |
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| 397 | private static final boolean DEBUG = true; |
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| 398 | |
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| 399 | |
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| 400 | public static void usage(){ |
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| 401 | System.err.print( |
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| 402 | "Usage: java Socks.SocksDatagramSocket host port [socksHost socksPort]\n"); |
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| 403 | } |
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| 404 | |
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| 405 | static final int defaultProxyPort = 1080; //Default Port |
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| 406 | static final String defaultProxyHost = "www-proxy"; //Default proxy |
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| 407 | |
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| 408 | public static void main(String args[]){ |
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| 409 | int port; |
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| 410 | String host; |
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| 411 | int proxyPort; |
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| 412 | String proxyHost; |
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| 413 | InetAddress ip; |
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| 414 | |
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| 415 | if(args.length > 1 && args.length < 5){ |
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| 416 | try{ |
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| 417 | |
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| 418 | host = args[0]; |
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| 419 | port = Integer.parseInt(args[1]); |
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| 420 | |
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| 421 | proxyPort =(args.length > 3)? Integer.parseInt(args[3]) |
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| 422 | : defaultProxyPort; |
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| 423 | |
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| 424 | host = args[0]; |
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| 425 | ip = InetAddress.getByName(host); |
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| 426 | |
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| 427 | proxyHost =(args.length > 2)? args[2] |
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| 428 | : defaultProxyHost; |
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| 429 | |
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| 430 | Proxy.setDefaultProxy(proxyHost,proxyPort); |
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| 431 | Proxy p = Proxy.getDefaultProxy(); |
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| 432 | p.addDirect("lux"); |
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| 433 | |
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| 434 | |
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| 435 | DatagramSocket ds = new Socks5DatagramSocket(); |
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| 436 | |
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| 437 | |
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| 438 | BufferedReader in = new BufferedReader( |
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| 439 | new InputStreamReader(System.in)); |
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| 440 | String s; |
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| 441 | |
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| 442 | System.out.print("Enter line:"); |
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| 443 | s = in.readLine(); |
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| 444 | |
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| 445 | while(s != null){ |
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| 446 | byte[] data = (s+"\r\n").getBytes(); |
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| 447 | DatagramPacket dp = new DatagramPacket(data,0,data.length, |
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| 448 | ip,port); |
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| 449 | System.out.println("Sending to: "+ip+":"+port); |
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| 450 | ds.send(dp); |
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| 451 | dp = new DatagramPacket(new byte[1024],1024); |
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| 452 | |
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| 453 | System.out.println("Trying to recieve on port:"+ |
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| 454 | ds.getLocalPort()); |
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| 455 | ds.receive(dp); |
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| 456 | System.out.print("Recieved:\n"+ |
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| 457 | "From:"+dp.getAddress()+":"+dp.getPort()+ |
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| 458 | "\n\n"+ |
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| 459 | new String(dp.getData(),dp.getOffset(),dp.getLength())+"\n" |
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| 460 | ); |
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| 461 | System.out.print("Enter line:"); |
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| 462 | s = in.readLine(); |
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| 463 | |
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| 464 | } |
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| 465 | ds.close(); |
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| 466 | System.exit(1); |
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| 467 | |
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| 468 | }catch(SocksException s_ex){ |
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| 469 | System.err.println("SocksException:"+s_ex); |
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| 470 | s_ex.printStackTrace(); |
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| 471 | System.exit(1); |
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| 472 | }catch(IOException io_ex){ |
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| 473 | io_ex.printStackTrace(); |
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| 474 | System.exit(1); |
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| 475 | }catch(NumberFormatException num_ex){ |
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| 476 | usage(); |
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| 477 | num_ex.printStackTrace(); |
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| 478 | System.exit(1); |
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| 479 | } |
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| 480 | |
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| 481 | }else{ |
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| 482 | usage(); |
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| 483 | } |
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| 484 | } |
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| 485 | */ |
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| 486 | |
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| 487 | } |
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