Source Code Cross Referenced for serverPortForwardingSch.java in  » Search-Engine » yacy » de » anomic » server » portForwarding » sch » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Search Engine » yacy » de.anomic.server.portForwarding.sch 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        // serverPortForwardingSch.java 
002:        // -------------------------------------
003:        // part of YACY
004:        // (C) by Michael Peter Christen; mc@anomic.de
005:        // first published on http://www.anomic.de
006:        // Frankfurt, Germany, 2004
007:        //
008:        // This file ist contributed by Martin Thelian
009:        //
010:        // $LastChangedDate: 2006-02-20 23:57:42 +0100 (Mo, 20 Feb 2006) $
011:        // $LastChangedRevision: 1715 $
012:        // $LastChangedBy: borg-0300 $
013:        //
014:        // This program is free software; you can redistribute it and/or modify
015:        // it under the terms of the GNU General Public License as published by
016:        // the Free Software Foundation; either version 2 of the License, or
017:        // (at your option) any later version.
018:        //
019:        // This program is distributed in the hope that it will be useful,
020:        // but WITHOUT ANY WARRANTY; without even the implied warranty of
021:        // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
022:        // GNU General Public License for more details.
023:        //
024:        // You should have received a copy of the GNU General Public License
025:        // along with this program; if not, write to the Free Software
026:        // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
027:        //
028:        // Using this software in any meaning (reading, learning, copying, compiling,
029:        // running) means that you agree that the Author(s) is (are) not responsible
030:        // for cost, loss of data or any harm that may be caused directly or indirectly
031:        // by usage of this softare or this documentation. The usage of this software
032:        // is on your own risk. The installation and usage (starting/running) of this
033:        // software may allow other people or application to access your computer and
034:        // any attached devices and is highly dependent on the configuration of the
035:        // software which must be done by the user of the software; the author(s) is
036:        // (are) also not responsible for proper configuration and usage of the
037:        // software, even if provoked by documentation provided together with
038:        // the software.
039:        //
040:        // Any changes to this file according to the GPL as documented in the file
041:        // gpl.txt aside this file in the shipment you received can be done to the
042:        // lines that follows this copyright notice here, but changes must not be
043:        // done inside the copyright notive above. A re-distribution must contain
044:        // the intact and unchanged copyright notice.
045:        // Contributions and changes to the program code must be marked as such.
046:
047:        package de.anomic.server.portForwarding.sch;
048:
049:        import java.io.IOException;
050:
051:        import com.jcraft.jsch.JSch;
052:        import com.jcraft.jsch.ProxyHTTP;
053:        import com.jcraft.jsch.Session;
054:        import com.jcraft.jsch.UIKeyboardInteractive;
055:        import com.jcraft.jsch.UserInfo;
056:
057:        import de.anomic.server.serverInstantThread;
058:        import de.anomic.server.serverSwitch;
059:        import de.anomic.server.logging.serverLog;
060:        import de.anomic.server.portForwarding.serverPortForwarding;
061:        import de.anomic.yacy.yacyClient;
062:        import de.anomic.yacy.yacyCore;
063:
064:        public class serverPortForwardingSch implements  serverPortForwarding {
065:
066:            /* ========================================================================
067:             * Constants needed to read properties from the configuration file
068:             * ======================================================================== */
069:            public static final String FORWARDING_HOST = "portForwarding.sch.Host";
070:            public static final String FORWARDING_HOST_PORT = "portForwarding.sch.HostPort";
071:            public static final String FORWARDING_HOST_USER = "portForwarding.sch.HostUser";
072:            public static final String FORWARDING_HOST_PWD = "portForwarding.sch.HostPwd";
073:
074:            public static final String FORWARDING_PORT = "portForwarding.sch.Port";
075:            public static final String FORWARDING_USE_PROXY = "portForwarding.sch.UseProxy";
076:
077:            /* ========================================================================
078:             * Other object fields
079:             * ======================================================================== */
080:            private serverSwitch switchboard;
081:
082:            private String forwardingHost;
083:            private int forwardingHostPort;
084:            private String forwardingHostUser;
085:            private String forwardingHostPwd;
086:
087:            private int forwardingPort;
088:            private boolean useProxy;
089:
090:            private String remoteProxyHost;
091:            private int remoteProxyPort;
092:
093:            private String localHost;
094:            private int localHostPort;
095:
096:            private static Session session;
097:            private static serverInstantThread sessionWatcher;
098:
099:            private serverLog log;
100:
101:            public serverPortForwardingSch() {
102:                super ();
103:                this .log = new serverLog("PORT_FORWARDING_SCH");
104:            }
105:
106:            public void init(serverSwitch switchboard, String localHost,
107:                    int localPort) throws Exception {
108:                try {
109:                    this .log
110:                            .logFine("Initializing port forwarding via sch ...");
111:
112:                    this .switchboard = switchboard;
113:
114:                    this .forwardingHost = switchboard.getConfig(
115:                            FORWARDING_HOST, "localhost");
116:                    this .forwardingHostPort = Integer
117:                            .valueOf(
118:                                    switchboard.getConfig(FORWARDING_HOST_PORT,
119:                                            "8080")).intValue();
120:                    this .forwardingHostUser = switchboard.getConfig(
121:                            FORWARDING_HOST_USER, "xxx");
122:                    this .forwardingHostPwd = switchboard.getConfig(
123:                            FORWARDING_HOST_PWD, "xxx");
124:
125:                    this .forwardingPort = Integer.valueOf(
126:                            switchboard.getConfig(FORWARDING_PORT, "8080"))
127:                            .intValue();
128:                    this .useProxy = Boolean.valueOf(
129:                            switchboard
130:                                    .getConfig(FORWARDING_USE_PROXY, "false"))
131:                            .booleanValue();
132:
133:                    this .localHost = localHost;
134:                    this .localHostPort = localPort;
135:
136:                    // load remote proxy data
137:                    this .remoteProxyHost = switchboard.getConfig(
138:                            "remoteProxyHost", "");
139:                    try {
140:                        this .remoteProxyPort = Integer.parseInt(switchboard
141:                                .getConfig("remoteProxyPort", "3128"));
142:                    } catch (NumberFormatException e) {
143:                        remoteProxyPort = 3128;
144:                    }
145:
146:                    // checking if all needed libs are availalbe
147:                    String javaClassPath = System
148:                            .getProperty("java.class.path");
149:                    if (javaClassPath.indexOf("jsch") == -1) {
150:                        throw new IllegalStateException("Missing library.");
151:                    }
152:                } catch (Exception e) {
153:                    this .log.logSevere("Unable to initialize port forwarding.",
154:                            e);
155:                    throw e;
156:                }
157:            }
158:
159:            public String getHost() {
160:                return this .forwardingHost;
161:            }
162:
163:            public int getPort() {
164:                return this .forwardingPort;
165:            }
166:
167:            public synchronized void connect() throws IOException {
168:                try {
169:                    if ((session != null) && (session.isConnected()))
170:                        throw new IOException("Session already connected");
171:
172:                    this .log
173:                            .logInfo("Trying to connect to remote port forwarding host "
174:                                    + this .forwardingHostUser
175:                                    + "@"
176:                                    + this .forwardingHost
177:                                    + ":"
178:                                    + this .forwardingHostPort);
179:
180:                    JSch jsch = new JSch();
181:                    session = jsch.getSession(this .forwardingHostUser,
182:                            this .forwardingHost, this .forwardingHostPort);
183:                    session.setPassword(this .forwardingHostPwd);
184:
185:                    /*
186:                     * Setting the StrictHostKeyChecking to ignore unknown
187:                     * hosts because of a missing known_hosts file ...
188:                     */
189:                    java.util.Properties config = new java.util.Properties();
190:                    config.put("StrictHostKeyChecking", "no");
191:                    session.setConfig(config);
192:
193:                    // setting the proxy that should be used
194:                    if (this .useProxy) {
195:                        session.setProxy(new ProxyHTTP(this .remoteProxyHost,
196:                                this .remoteProxyPort));
197:                    }
198:
199:                    // username and password will be given via UserInfo interface.
200:                    UserInfo ui = new MyUserInfo(this .forwardingHostPwd);
201:                    session.setUserInfo(ui);
202:
203:                    // trying to connect ...
204:                    session.connect();
205:
206:                    // activating remote port forwarding 
207:                    session.setPortForwardingR(this .forwardingPort,
208:                            this .localHost, this .localHostPort);
209:
210:                    // using a timer task to control if the session remains open
211:                    if (sessionWatcher == null) {
212:                        this .log
213:                                .logFine("Deploying port forwarding session watcher thread.");
214:                        this .switchboard
215:                                .deployThread(
216:                                        "portForwardingWatcher",
217:                                        "Remote Port Forwarding Watcher",
218:                                        "this thread is used to detect broken connections and to re-establish it if necessary.",
219:                                        null,
220:                                        sessionWatcher = new serverInstantThread(
221:                                                this , "reconnect", null, null),
222:                                        30000, 30000, 30000, 1000);
223:                        sessionWatcher.setSyncObject(new Object());
224:                    }
225:
226:                    this .log
227:                            .logInfo("Remote port forwarding connection established: "
228:                                    + this .forwardingHost
229:                                    + ":"
230:                                    + this .forwardingPort
231:                                    + " -> "
232:                                    + this .localHost + ":" + this .localHostPort);
233:                } catch (Exception e) {
234:                    this .log
235:                            .logSevere(
236:                                    "Unable to connect to remote port forwarding host.",
237:                                    e);
238:                    throw new IOException(e.getMessage());
239:                }
240:            }
241:
242:            public synchronized boolean reconnect() throws IOException {
243:                if ((!this .isConnected())
244:                        && (!Thread.currentThread().isInterrupted())) {
245:                    this .log
246:                            .logFine("Trying to reconnect to port forwarding host.");
247:                    this .disconnect();
248:                    this .connect();
249:                    return this .isConnected();
250:                }
251:                return false;
252:            }
253:
254:            public synchronized void disconnect() throws IOException {
255:                if (session == null)
256:                    throw new IOException("No connection established.");
257:
258:                // terminating port watcher thread
259:                this .log
260:                        .logFine("Terminating port forwarding session watcher thread.");
261:                this .switchboard.terminateThread("portForwardingWatcher", true);
262:                sessionWatcher = null;
263:
264:                // disconnection the session
265:                try {
266:                    session.disconnect();
267:                    this .log
268:                            .logFine("Successfully disconnected from port forwarding host.");
269:                } catch (Exception e) {
270:                    this .log
271:                            .logSevere(
272:                                    "Error while trying to disconnect from port forwarding host.",
273:                                    e);
274:                    throw new IOException(e.getMessage());
275:                }
276:            }
277:
278:            public synchronized boolean isConnected() {
279:                if (session == null)
280:                    return false;
281:                if (!session.isConnected())
282:                    return false;
283:                int urls = yacyClient.queryUrlCount(yacyCore.seedDB.mySeed());
284:                return !(urls < 0);
285:            }
286:
287:            class MyUserInfo implements  UserInfo, UIKeyboardInteractive {
288:                String passwd;
289:
290:                public MyUserInfo(String password) {
291:                    this .passwd = password;
292:                }
293:
294:                public String getPassword() {
295:                    return this .passwd;
296:                }
297:
298:                public boolean promptYesNo(String str) {
299:                    System.err.println("User was prompted from: " + str);
300:                    return true;
301:                }
302:
303:                public String getPassphrase() {
304:                    return null;
305:                }
306:
307:                public boolean promptPassphrase(String message) {
308:                    System.out.println("promptPassphrase : " + message);
309:                    return false;
310:                }
311:
312:                public boolean promptPassword(String message) {
313:                    System.out.println("promptPassword : " + message);
314:                    return true;
315:                }
316:
317:                /**
318:                 * @see com.jcraft.jsch.UserInfo#showMessage(java.lang.String)
319:                 */
320:                public void showMessage(String message) {
321:                    System.out
322:                            .println("Sch has tried to show the following message to the user: "
323:                                    + message);
324:                }
325:
326:                public String[] promptKeyboardInteractive(String destination,
327:                        String name, String instruction, String[] prompt,
328:                        boolean[] echo) {
329:                    System.out
330:                            .println("User was prompted using interactive-keyboard: "
331:                                    + "\n\tDestination: "
332:                                    + destination
333:                                    + "\n\tName:        "
334:                                    + name
335:                                    + "\n\tInstruction: "
336:                                    + instruction
337:                                    + "\n\tPrompt:      "
338:                                    + arrayToString2(prompt, "|")
339:                                    + "\n\techo:        "
340:                                    + arrayToString2(echo, "|"));
341:
342:                    if ((prompt.length >= 1)
343:                            && (prompt[0].startsWith("Password")))
344:                        return new String[] { this .passwd };
345:                    return new String[] {};
346:                }
347:
348:                String arrayToString2(String[] a, String separator) {
349:                    StringBuffer result = new StringBuffer(); // start with first element
350:                    if (a.length > 0) {
351:                        result.append(a[0]);
352:                        for (int i = 1; i < a.length; i++) {
353:                            result.append(separator);
354:                            result.append(a[i]);
355:                        }
356:                    }
357:                    return result.toString();
358:                }
359:
360:                String arrayToString2(boolean[] a, String separator) {
361:                    StringBuffer result = new StringBuffer(); // start with first element
362:                    if (a.length > 0) {
363:                        result.append(a[0]);
364:                        for (int i = 1; i < a.length; i++) {
365:                            result.append(separator);
366:                            result.append(a[i]);
367:                        }
368:                    }
369:                    return result.toString();
370:                }
371:            }
372:
373:        }
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