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annotate src/net/sourceforge/jsocks/server/Ident.java @ 416:07c1da90deab

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avoid null pointer
author Carl Byington <carl@five-ten-sg.com>
date Mon, 27 Oct 2014 13:58:42 -0700
parents 72de889ecfe7
children
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rev   line source
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1 package net.sourceforge.jsocks.server;
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2 import net.sourceforge.jsocks.*;
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3 import java.net.*;
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4 import java.io.*;
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5 import java.util.StringTokenizer;
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6
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7 /**
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8 Class Ident provides means to obtain user name of the owner of the socket
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9 on remote machine, providing remote machine runs identd daemon.
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10 <p>
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11 To use it:
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12 <tt><pre>
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13 Socket s = ss.accept();
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14 Ident id = new Ident(s);
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15 if(id.successful) goUseUser(id.userName);
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16 else handleIdentError(id.errorCode,id.errorMessage)
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17 </pre></tt>
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18 */
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19 public class Ident{
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20
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21 /** Error Message can be null.*/
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22 public String errorMessage;
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23 /** Host type as returned by daemon, can be null, if error happened*/
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24 public String hostType;
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25 /** User name as returned by the identd daemon, or null, if it failed*/
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26 public String userName;
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27
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28 /** If this is true then userName and hostType contain valid values.
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29 Else errorCode contain the error code, and errorMessage contains
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30 the corresponding message.
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31 */
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32 public boolean successful;
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33 /** Error code*/
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34 public int errorCode;
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35 /** Identd on port 113 can't be contacted*/
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36 public static final int ERR_NO_CONNECT = 1;
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37 /** Connection timed out*/
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38 public static final int ERR_TIMEOUT = 2;
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39 /** Identd daemon responded with ERROR, in this case errorMessage
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40 contains the string explanation, as send by the daemon.
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41 */
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42 public static final int ERR_PROTOCOL = 3;
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43 /**
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44 When parsing server response protocol error happened.
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45 */
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46 public static final int ERR_PROTOCOL_INCORRECT = 4;
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47
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48
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49 /** Maximum amount of time we should wait before dropping the
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50 connection to identd server.Setting it to 0 implies infinit
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51 timeout.
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52 */
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53 public static final int connectionTimeout = 10000;
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54
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55
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56 /**
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57 Constructor tries to connect to Identd daemon on the host of the
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58 given socket, and retrieve user name of the owner of given socket
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59 connection on remote machine. After constructor returns public
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60 fields are initialised to whatever the server returned.
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61 <p>
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62 If user name was successfully retrieved successful is set to true,
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63 and userName and hostType are set to whatever server returned. If
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64 however for some reason user name was not obtained, successful is set
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65 to false and errorCode contains the code explaining the reason of
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66 failure, and errorMessage contains human readable explanation.
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67 <p>
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68 Constructor may block, for a while.
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69 @param s Socket whose ownership on remote end should be obtained.
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70 */
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71 public Ident(Socket s ){
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72 Socket sock = null;
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73 successful = false; //We are pessimistic
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74
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75 try{
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76 sock = new Socket(s.getInetAddress(),113);
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77 sock.setSoTimeout(connectionTimeout);
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78 byte[] request = (""+s.getPort()+" , "+
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79 s.getLocalPort()+"\r\n").getBytes();
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80
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81 sock.getOutputStream().write(request);
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82
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83 BufferedReader in = new BufferedReader(
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84 new InputStreamReader(sock.getInputStream()));
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85
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86 parseResponse(in.readLine());
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87
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88 }catch(InterruptedIOException iioe){
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89 errorCode = ERR_TIMEOUT;
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90 errorMessage = "Connection to identd timed out.";
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91 }catch(ConnectException ce){
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92 errorCode = ERR_NO_CONNECT;
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93 errorMessage = "Connection to identd server failed.";
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94
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95 }catch(IOException ioe){
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96 errorCode = ERR_NO_CONNECT;
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97 errorMessage = ""+ioe;
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98 }finally{
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99 try{ if(sock!=null) sock.close();}catch(IOException ioe){};
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100 }
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101 }
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102
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103 private void parseResponse(String response){
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104 if(response == null){
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105 errorCode = ERR_PROTOCOL_INCORRECT;
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106 errorMessage = "Identd server closed connection.";
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107 return;
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108 }
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109
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110 StringTokenizer st = new StringTokenizer(response,":");
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111 if(st.countTokens() < 3){
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112 errorCode = ERR_PROTOCOL_INCORRECT;
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113 errorMessage = "Can't parse server response.";
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114 return;
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115 }
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116
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117 st.nextToken(); //Discard first token, it's basically what we have send
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118 String command = st.nextToken().trim().toUpperCase();
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119
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120 if(command.equals("USERID") && st.countTokens() >= 2){
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121 successful = true;
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122 hostType = st.nextToken().trim();
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123 userName = st.nextToken("").substring(1);//Get all that is left
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124 }else if(command.equals("ERROR")){
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125 errorCode = ERR_PROTOCOL;
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126 errorMessage = st.nextToken();
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127 }else{
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128 errorCode = ERR_PROTOCOL_INCORRECT;
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129 System.out.println("Opa!");
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130 errorMessage = "Can't parse server response.";
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131 }
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132
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133
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134 }
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135
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136 ///////////////////////////////////////////////
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137 //USED for Testing
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138 /*
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139 public static void main(String[] args) throws IOException{
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140
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141 Socket s = null;
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142 s = new Socket("gp101-16", 1391);
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143
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144 Ident id = new Ident(s);
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145 if(id.successful){
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146 System.out.println("User: "+id.userName);
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147 System.out.println("HostType: "+id.hostType);
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148 }else{
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149 System.out.println("ErrorCode: "+id.errorCode);
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150 System.out.println("ErrorMessage: "+id.errorMessage);
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151
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152 }
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153
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154 if(s!= null) s.close();
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155 }
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156 //*/
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157
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158 }