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annotate src/net/sourceforge/jsocks/server/ServerAuthenticator.java @ 372:20d0a1356c43

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debug kex error
author Carl Byington <carl@five-ten-sg.com>
date Mon, 04 Aug 2014 12:11:12 -0700
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1 package net.sourceforge.jsocks.server;
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2
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3 import java.io.IOException;
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4 import java.io.InputStream;
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5 import java.io.OutputStream;
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6 import java.net.Socket;
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7 import java.net.DatagramPacket;
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8 import net.sourceforge.jsocks.ProxyMessage;
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9 import net.sourceforge.jsocks.UDPEncapsulation;
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10
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11 /**
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12 Classes implementing this interface should provide socks server with
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13 authentication and authorization of users.
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14 **/
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15 public interface ServerAuthenticator{
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16
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17 /**
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18 This method is called when a new connection accepted by the server.
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19 <p>
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20 At this point no data have been extracted from the connection. It is
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21 responsibility of this method to ensure that the next byte in the
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22 stream after this method have been called is the first byte of the
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23 socks request message. For SOCKSv4 there is no authentication data and
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24 the first byte in the stream is part of the request. With SOCKSv5 however
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25 there is an authentication data first. It is expected that implementaions
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26 will process this authentication data.
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27 <p>
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28 If authentication was successful an instance of ServerAuthentication
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29 should be returned, it later will be used by the server to perform
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30 authorization and some other things. If authentication fails null should
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31 be returned, or an exception may be thrown.
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32
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33 @param s Accepted Socket.
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34 @return An instance of ServerAuthenticator to be used for this connection
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35 or null
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36 */
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37 ServerAuthenticator startSession(Socket s) throws IOException;
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38
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39 /**
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40 This method should return input stream which should be used on the
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41 accepted socket.
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42 <p>
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43 SOCKSv5 allows to have multiple authentication methods, and these methods
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44 might require some kind of transformations being made on the data.
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45 <p>
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46 This method is called on the object returned from the startSession
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47 function.
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48 */
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49 InputStream getInputStream();
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50 /**
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51 This method should return output stream to use to write to the accepted
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52 socket.
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53 <p>
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54 SOCKSv5 allows to have multiple authentication methods, and these methods
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55 might require some kind of transformations being made on the data.
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56 <p>
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57 This method is called on the object returned from the startSession
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58 function.
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59 */
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60 OutputStream getOutputStream();
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61
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62 /**
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63 This method should return UDPEncapsulation, which should be used
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64 on the datagrams being send in/out.
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65 <p>
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66 If no transformation should be done on the datagrams, this method
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67 should return null.
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68 <p>
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69 This method is called on the object returned from the startSession
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70 function.
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71 */
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72
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73 UDPEncapsulation getUdpEncapsulation();
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74
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75 /**
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76 This method is called when a request have been read.
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77 <p>
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78 Implementation should decide wether to grant request or not. Returning
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79 true implies granting the request, false means request should be rejected.
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80 <p>
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81 This method is called on the object returned from the startSession
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82 function.
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83 @param msg Request message.
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84 @return true to grant request, false to reject it.
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85 */
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86 boolean checkRequest(ProxyMessage msg);
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87
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88 /**
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89 This method is called when datagram is received by the server.
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90 <p>
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91 Implementaions should decide wether it should be forwarded or dropped.
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92 It is expecteed that implementation will use datagram address and port
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93 information to make a decision, as well as anything else. Address and
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94 port of the datagram are always correspond to remote machine. It is
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95 either destination or source address. If out is true address is destination
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96 address, else it is a source address, address of the machine from which
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97 datagram have been received for the client.
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98 <p>
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99 Implementaions should return true if the datagram is to be forwarded, and
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100 false if the datagram should be dropped.
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101 <p>
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102 This method is called on the object returned from the startSession
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103 function.
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104
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105 @param out If true the datagram is being send out(from the client),
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106 otherwise it is an incoming datagram.
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107 @return True to forward datagram false drop it silently.
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108 */
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109 boolean checkRequest(DatagramPacket dp, boolean out);
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110
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111 /**
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112 This method is called when session is completed. Either due to normal
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113 termination or due to any error condition.
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114 <p>
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115 This method is called on the object returned from the startSession
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116 function.
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117 */
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118 void endSession();
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119 }