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1 /*
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2 * ConnectBot: simple, powerful, open-source SSH client for Android
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3 * Copyright 2007 Kenny Root, Jeffrey Sharkey
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4 *
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5 * Licensed under the Apache License, Version 2.0 (the "License");
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6 * you may not use this file except in compliance with the License.
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7 * You may obtain a copy of the License at
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8 *
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9 * http://www.apache.org/licenses/LICENSE-2.0
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10 *
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11 * Unless required by applicable law or agreed to in writing, software
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12 * distributed under the License is distributed on an "AS IS" BASIS,
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13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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14 * See the License for the specific language governing permissions and
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15 * limitations under the License.
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16 */
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17
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18 package com.five_ten_sg.connectbot.transport;
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19
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20 import java.io.IOException;
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21 import java.io.InputStream;
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22 import java.io.OutputStream;
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23 import java.net.Socket;
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24 import java.net.SocketException;
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25 import java.net.UnknownHostException;
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26 import java.nio.charset.Charset;
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27 import java.util.Map;
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28 import java.util.regex.Matcher;
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29 import java.util.regex.Pattern;
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30
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31 import com.five_ten_sg.connectbot.R;
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32 import com.five_ten_sg.connectbot.bean.HostBean;
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33 import com.five_ten_sg.connectbot.service.TerminalBridge;
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34 import com.five_ten_sg.connectbot.service.TerminalManager;
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35 import com.five_ten_sg.connectbot.util.HostDatabase;
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11
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36
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0
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37 import android.content.Context;
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38 import android.net.Uri;
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39 import android.util.Log;
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40 import de.mud.telnet.TelnetProtocolHandler;
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41
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42 /**
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43 * Telnet transport implementation.<br/>
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44 * Original idea from the JTA telnet package (de.mud.telnet)
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45 *
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46 * @author Kenny Root
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47 *
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48 */
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49 public class Telnet extends AbsTransport {
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50 private static final String TAG = "ConnectBot.Telnet";
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51 private static final String PROTOCOL = "telnet";
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52
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53 private static final int DEFAULT_PORT = 23;
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54
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55 private TelnetProtocolHandler handler;
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56 private Socket socket;
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57
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58 private InputStream is;
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59 private OutputStream os;
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60 private int width;
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61 private int height;
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62
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63 private boolean connected = false;
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64
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65 static final Pattern hostmask;
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66 static {
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67 hostmask = Pattern.compile("^([0-9a-z.-]+)(:(\\d+))?$", Pattern.CASE_INSENSITIVE);
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68 }
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69
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70 public Telnet() {
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71 handler = new TelnetProtocolHandler() {
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72 /** get the current terminal type */
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73 @Override
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74 public String getTerminalType() {
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75 return getEmulation();
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76 }
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77 /** get the current window size */
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78 @Override
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79 public int[] getWindowSize() {
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80 return new int[] { width, height };
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81 }
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82 /** notify about local echo */
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83 @Override
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84 public void setLocalEcho(boolean echo) {
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85 /* EMPTY */
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86 }
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87 /** write data to our back end */
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88 @Override
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89 public void write(byte[] b) throws IOException {
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90 if (os != null)
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91 os.write(b);
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92 }
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93 /** sent on IAC EOR (prompt terminator for remote access systems). */
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94 @Override
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95 public void notifyEndOfRecord() {
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96 }
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97 @Override
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98 protected String getCharsetName() {
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99 Charset charset = bridge.getCharset();
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100
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101 if (charset != null)
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102 return charset.name();
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103 else
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104 return "";
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105 }
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106 };
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107 }
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108
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109 /**
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110 * @param host
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111 * @param bridge
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112 * @param manager
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113 */
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114 public Telnet(HostBean host, TerminalBridge bridge, TerminalManager manager) {
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115 super(host, bridge, manager);
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116 }
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117
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118 public static String getProtocolName() {
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119 return PROTOCOL;
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120 }
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121
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122 @Override
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123 public void connect() {
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124 try {
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125 socket = new Socket(host.getHostname(), host.getPort());
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126 connected = true;
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127 is = socket.getInputStream();
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128 os = socket.getOutputStream();
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129 bridge.onConnected();
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130 }
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131 catch (UnknownHostException e) {
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132 Log.d(TAG, "IO Exception connecting to host", e);
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133 }
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134 catch (IOException e) {
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135 Log.d(TAG, "IO Exception connecting to host", e);
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136 }
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137 }
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138
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139 @Override
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140 public void close() {
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141 connected = false;
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142
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143 if (socket != null)
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144 try {
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145 socket.close();
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146 socket = null;
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147 }
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148 catch (IOException e) {
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149 Log.d(TAG, "Error closing telnet socket.", e);
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150 }
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151 }
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152
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153 @Override
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154 public void flush() throws IOException {
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155 os.flush();
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156 }
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157
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158 @Override
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159 public int getDefaultPort() {
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160 return DEFAULT_PORT;
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161 }
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162
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163 @Override
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164 public boolean isConnected() {
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165 return connected;
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166 }
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167
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168 @Override
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169 public boolean isSessionOpen() {
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170 return connected;
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171 }
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172
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173 @Override
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174 public boolean isAuthenticated() {
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175 return isConnected();
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176 }
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177
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178 @Override
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179 public boolean willBlock() {
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180 if (is == null) return true;
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181 try {
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182 return is.available() == 0;
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183 } catch (Exception e) {
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184 return true;
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185 }
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186 }
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187
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188 @Override
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189 public int read(byte[] buffer, int start, int len) throws IOException {
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190 /* process all already read bytes */
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191 int n = 0;
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192
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193 do {
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194 n = handler.negotiate(buffer, start);
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195
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196 if (n > 0)
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197 return n;
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198 }
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199 while (n == 0);
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200
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201 while (n <= 0) {
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202 do {
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203 n = handler.negotiate(buffer, start);
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204
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205 if (n > 0)
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206 return n;
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207 }
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208 while (n == 0);
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209
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210 n = is.read(buffer, start, len);
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211
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212 if (n < 0) {
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213 bridge.dispatchDisconnect(false);
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214 throw new IOException("Remote end closed connection.");
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215 }
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216
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217 handler.inputfeed(buffer, start, n);
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218 n = handler.negotiate(buffer, start);
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219 }
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220
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221 return n;
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222 }
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223
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224 @Override
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225 public void write(byte[] buffer) throws IOException {
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226 try {
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227 if (os != null)
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228 os.write(buffer);
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229 }
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230 catch (SocketException e) {
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231 bridge.dispatchDisconnect(false);
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232 }
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233 }
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234
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235 @Override
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236 public void write(int c) throws IOException {
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237 try {
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238 if (os != null)
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239 os.write(c);
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240 }
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241 catch (SocketException e) {
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242 bridge.dispatchDisconnect(false);
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243 }
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244 }
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245
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246 @Override
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247 public void setDimensions(int columns, int rows, int width, int height) {
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248 try {
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249 handler.setWindowSize(columns, rows);
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250 }
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251 catch (IOException e) {
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252 Log.e(TAG, "Couldn't resize remote terminal", e);
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253 }
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254 }
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255
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256 @Override
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257 public String getDefaultNickname(String username, String hostname, int port) {
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258 if (port == DEFAULT_PORT) {
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259 return String.format("%s", hostname);
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260 }
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261 else {
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262 return String.format("%s:%d", hostname, port);
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263 }
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264 }
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265
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266 public static Uri getUri(String input) {
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267 Matcher matcher = hostmask.matcher(input);
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268
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269 if (!matcher.matches())
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270 return null;
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271
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272 StringBuilder sb = new StringBuilder();
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273 sb.append(PROTOCOL)
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274 .append("://")
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275 .append(matcher.group(1));
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276 String portString = matcher.group(3);
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277 int port = DEFAULT_PORT;
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278
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279 if (portString != null) {
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280 try {
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281 port = Integer.parseInt(portString);
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282
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283 if (port < 1 || port > 65535) {
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284 port = DEFAULT_PORT;
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285 }
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286 }
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287 catch (NumberFormatException nfe) {
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288 // Keep the default port
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289 }
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290 }
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291
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292 if (port != DEFAULT_PORT) {
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293 sb.append(':');
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294 sb.append(port);
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295 }
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296
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297 sb.append("/#")
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298 .append(Uri.encode(input));
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299 Uri uri = Uri.parse(sb.toString());
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300 return uri;
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301 }
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302
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303 @Override
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304 public HostBean createHost(Uri uri) {
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305 HostBean host = new HostBean();
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306 host.setProtocol(PROTOCOL);
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307 host.setHostname(uri.getHost());
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308 int port = uri.getPort();
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309
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310 if (port < 0)
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311 port = DEFAULT_PORT;
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312
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313 host.setPort(port);
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314 String nickname = uri.getFragment();
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315
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316 if (nickname == null || nickname.length() == 0) {
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317 host.setNickname(getDefaultNickname(host.getUsername(),
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318 host.getHostname(), host.getPort()));
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319 }
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320 else {
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321 host.setNickname(uri.getFragment());
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322 }
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323
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324 return host;
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325 }
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326
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327 @Override
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328 public void getSelectionArgs(Uri uri, Map<String, String> selection) {
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329 selection.put(HostDatabase.FIELD_HOST_PROTOCOL, PROTOCOL);
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330 selection.put(HostDatabase.FIELD_HOST_NICKNAME, uri.getFragment());
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331 selection.put(HostDatabase.FIELD_HOST_HOSTNAME, uri.getHost());
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332 int port = uri.getPort();
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333
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334 if (port < 0)
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335 port = DEFAULT_PORT;
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336
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337 selection.put(HostDatabase.FIELD_HOST_PORT, Integer.toString(port));
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338 }
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339
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340 public static String getFormatHint(Context context) {
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341 return String.format("%s:%s",
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342 context.getString(R.string.format_hostname),
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343 context.getString(R.string.format_port));
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344 }
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345
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346 @Override
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347 public boolean usesNetwork() {
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348 return true;
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349 }
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350 }
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