| 1 | package be.nikiroo.utils.serial.server; |
| 2 | |
| 3 | import java.io.IOException; |
| 4 | import java.net.Socket; |
| 5 | |
| 6 | import be.nikiroo.utils.TraceHandler; |
| 7 | import be.nikiroo.utils.Version; |
| 8 | import be.nikiroo.utils.serial.Importer; |
| 9 | |
| 10 | /** |
| 11 | * This class implements a simple server that can bridge two other |
| 12 | * {@link Server}s. |
| 13 | * <p> |
| 14 | * It can, of course, inspect the data that goes through it (by default, it |
| 15 | * prints traces of the data). |
| 16 | * <p> |
| 17 | * Note: this {@link ServerBridge} has to be discarded after use (cannot be |
| 18 | * started twice). |
| 19 | * |
| 20 | * @author niki |
| 21 | */ |
| 22 | public class ServerBridge extends Server { |
| 23 | private final String forwardToHost; |
| 24 | private final int forwardToPort; |
| 25 | private final boolean forwardToSsl; |
| 26 | |
| 27 | /** |
| 28 | * Create a new server that will start listening on the network when |
| 29 | * {@link ServerBridge#start()} is called. |
| 30 | * |
| 31 | * @param port |
| 32 | * the port to listen on, or 0 to assign any unallocated port |
| 33 | * found (which can later on be queried via |
| 34 | * {@link ServerBridge#getPort()} |
| 35 | * @param ssl |
| 36 | * use a SSL connection (or not) |
| 37 | * |
| 38 | * @throws IOException |
| 39 | * in case of I/O error |
| 40 | */ |
| 41 | public ServerBridge(int port, boolean ssl, String forwardToHost, |
| 42 | int forwardToPort, boolean forwardToSsl) throws IOException { |
| 43 | super(port, ssl); |
| 44 | this.forwardToHost = forwardToHost; |
| 45 | this.forwardToPort = forwardToPort; |
| 46 | this.forwardToSsl = forwardToSsl; |
| 47 | } |
| 48 | |
| 49 | /** |
| 50 | * Create a new server that will start listening on the network when |
| 51 | * {@link ServerBridge#start()} is called. |
| 52 | * |
| 53 | * @param name |
| 54 | * the server name (only used for debug info and traces) |
| 55 | * @param port |
| 56 | * the port to listen on |
| 57 | * @param ssl |
| 58 | * use a SSL connection (or not) |
| 59 | * |
| 60 | * @throws IOException |
| 61 | * in case of I/O error |
| 62 | */ |
| 63 | public ServerBridge(String name, int port, boolean ssl, |
| 64 | String forwardToHost, int forwardToPort, boolean forwardToSsl) |
| 65 | throws IOException { |
| 66 | super(name, port, ssl); |
| 67 | this.forwardToHost = forwardToHost; |
| 68 | this.forwardToPort = forwardToPort; |
| 69 | this.forwardToSsl = forwardToSsl; |
| 70 | } |
| 71 | |
| 72 | /** |
| 73 | * The traces handler for this {@link Server}. |
| 74 | * <p> |
| 75 | * <ul> |
| 76 | * <li>At level 1, it will only print basic IN/OUT messages with length.</li> |
| 77 | * <li>At level 2, it will also print the data as a String.</li> |
| 78 | * <li>At level 3, it will try to interpret it (SLOW) and print the object |
| 79 | * type if possible.</li> |
| 80 | * <li>At level 4, it will try to print the {@link Object#toString()} value. |
| 81 | * </li> |
| 82 | * </ul> |
| 83 | * |
| 84 | * @param tracer |
| 85 | * the new traces handler |
| 86 | */ |
| 87 | @Override |
| 88 | public void setTraceHandler(TraceHandler tracer) { |
| 89 | super.setTraceHandler(tracer); |
| 90 | } |
| 91 | |
| 92 | @Override |
| 93 | protected ConnectActionServer createConnectActionServer(Socket s) { |
| 94 | return new ConnectActionServerString(s) { |
| 95 | @Override |
| 96 | public void action(final Version clientVersion) throws Exception { |
| 97 | onClientContact(clientVersion); |
| 98 | final ConnectActionServerString bridge = this; |
| 99 | |
| 100 | new ConnectActionClientString(forwardToHost, forwardToPort, |
| 101 | forwardToSsl, clientVersion) { |
| 102 | @Override |
| 103 | public void action(final Version serverVersion) |
| 104 | throws Exception { |
| 105 | onServerContact(serverVersion); |
| 106 | |
| 107 | for (String fromClient = bridge.rec(); fromClient != null; fromClient = bridge |
| 108 | .rec()) { |
| 109 | onRec(clientVersion, fromClient); |
| 110 | String fromServer = send(fromClient); |
| 111 | onSend(serverVersion, fromServer); |
| 112 | bridge.send(fromServer); |
| 113 | } |
| 114 | } |
| 115 | }.connect(); |
| 116 | } |
| 117 | }; |
| 118 | } |
| 119 | |
| 120 | /** |
| 121 | * This is the method that is called each time a client contact us. |
| 122 | * |
| 123 | * @param clientVersion |
| 124 | * the client version |
| 125 | * @param data |
| 126 | * the data sent by the client |
| 127 | */ |
| 128 | protected void onClientContact(Version clientVersion) { |
| 129 | getTraceHandler().trace("CLIENT " + clientVersion); |
| 130 | } |
| 131 | |
| 132 | /** |
| 133 | * This is the method that is called each time a client contact us. |
| 134 | * |
| 135 | * @param serverVersion |
| 136 | * the server version |
| 137 | * @param data |
| 138 | * the data sent by the client |
| 139 | */ |
| 140 | protected void onServerContact(Version serverVersion) { |
| 141 | getTraceHandler().trace("SERVER " + serverVersion); |
| 142 | } |
| 143 | |
| 144 | /** |
| 145 | * This is the method that is called each time a client contact us. |
| 146 | * |
| 147 | * @param clientVersion |
| 148 | * the client version |
| 149 | * @param data |
| 150 | * the data sent by the client |
| 151 | */ |
| 152 | protected void onRec(Version clientVersion, String data) { |
| 153 | trace("<<< CLIENT (" + clientVersion + ")", data); |
| 154 | } |
| 155 | |
| 156 | /** |
| 157 | * This is the method that is called each time the forwarded server contact |
| 158 | * us. |
| 159 | * |
| 160 | * @param serverVersion |
| 161 | * the client version |
| 162 | * @param data |
| 163 | * the data sent by the client |
| 164 | */ |
| 165 | protected void onSend(Version serverVersion, String data) { |
| 166 | trace(">>> SERVER (" + serverVersion + ")", data); |
| 167 | } |
| 168 | |
| 169 | /** |
| 170 | * Trace the data with the given prefix. |
| 171 | * |
| 172 | * @param prefix |
| 173 | * the prefix (client, server, version...) |
| 174 | * @param data |
| 175 | * the data to trace |
| 176 | */ |
| 177 | private void trace(String prefix, String data) { |
| 178 | getTraceHandler().trace(prefix + ": " + data.length() + " characters", |
| 179 | 1); |
| 180 | |
| 181 | if (getTraceHandler().getTraceLevel() >= 2) { |
| 182 | try { |
| 183 | Object obj = new Importer().read(data).getValue(); |
| 184 | if (obj == null) { |
| 185 | getTraceHandler().trace("NULL", 3); |
| 186 | getTraceHandler().trace("NULL", 4); |
| 187 | } else { |
| 188 | getTraceHandler().trace("(" + obj.getClass() + ")", 3); |
| 189 | getTraceHandler().trace("" + obj.toString(), 4); |
| 190 | } |
| 191 | } catch (Exception e) { |
| 192 | getTraceHandler().trace("(not an object)", 3); |
| 193 | getTraceHandler().trace(data, 4); |
| 194 | } |
| 195 | |
| 196 | getTraceHandler().trace("", 4); |
| 197 | } |
| 198 | } |
| 199 | |
| 200 | /** |
| 201 | * Start a bridge between 2 servers. |
| 202 | * |
| 203 | * @param args |
| 204 | * an array containing: |
| 205 | * <ul> |
| 206 | * <li>The bridge name</li> |
| 207 | * <li>The bridge port</li> |
| 208 | * <li>TRUE for a ssl bridge, FALSE for plain text</li> |
| 209 | * <li>The forward server host</li> |
| 210 | * <li>The forward server port</li> |
| 211 | * <li>TRUE for a ssl forward server, FALSE for plain text</li> |
| 212 | * <li>(optional) a trace level</li> |
| 213 | * </ul> |
| 214 | */ |
| 215 | public static void main(String[] args) { |
| 216 | final TraceHandler tracer = new TraceHandler(true, false, 0); |
| 217 | try { |
| 218 | if (args.length < 6) { |
| 219 | tracer.error("Invalid syntax.\n" |
| 220 | + "Syntax: [name] [port] [ssl] [fhost] [fport] [fssl] ([trace level])\n" |
| 221 | + "\tname: the bridge name\n" |
| 222 | + "\tport: the bridge port\n" |
| 223 | + "\tssl: TRUE for an SSL bridge, FALSE for plain text\n" |
| 224 | + "\tfhost: the forward server host\n" |
| 225 | + "\tfport: the forward server port\n" |
| 226 | + "\tfssl: TRUE for an SSL forward server, FALSE for plain text\n" |
| 227 | + "\ttrace level: the optional trace level (default is 1)\n"); |
| 228 | return; |
| 229 | } |
| 230 | |
| 231 | int i = 0; |
| 232 | String name = args[i++]; |
| 233 | int port = Integer.parseInt(args[i++]); |
| 234 | boolean ssl = Boolean.parseBoolean(args[i++]); |
| 235 | String fhost = args[i++]; |
| 236 | int fport = Integer.parseInt(args[i++]); |
| 237 | boolean fssl = Boolean.parseBoolean(args[i++]); |
| 238 | |
| 239 | int traceLevel = 1; |
| 240 | if (args.length > 6) { |
| 241 | traceLevel = Integer.parseInt(args[i++]); |
| 242 | } |
| 243 | |
| 244 | ServerBridge bridge = new ServerBridge(name, port, ssl, fhost, |
| 245 | fport, fssl); |
| 246 | bridge.setTraceHandler(new TraceHandler(true, true, traceLevel)); |
| 247 | bridge.run(); |
| 248 | } catch (Exception e) { |
| 249 | tracer.error(e); |
| 250 | } |
| 251 | } |
| 252 | } |