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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 | } |