1 /*
2 * EL4J, the Extension Library for the J2EE, adds incremental enhancements to
3 * the spring framework, http://el4j.sf.net
4 * Copyright (C) 2006 by ELCA Informatique SA, Av. de la Harpe 22-24,
5 * 1000 Lausanne, Switzerland, http://www.elca.ch
6 *
7 * EL4J is published under the GNU Lesser General Public License (LGPL)
8 * Version 2.1. See http://www.gnu.org/licenses/
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU Lesser General Public License for more details.
14 *
15 * For alternative licensing, please contact info@elca.ch
16 */
17
18 // Checkstyle: UseLogger off
19 package ch.elca.el4j.services.tcpforwarder;
20
21 import java.net.InetSocketAddress;
22
23 import org.springframework.util.StringUtils;
24
25 // Checkstyle: UncommentedMain off
26 /**
27 * Used to start the tcp forwarder from command line.
28 *
29 * @svnLink $Revision: 3884 $;$Date: 2009-08-04 15:48:31 +0200 (Di, 04. Aug 2009) $;$Author: swismer $;$URL: https://el4j.svn.sourceforge.net/svnroot/el4j/branches/el4j_3_1/el4j/framework/modules/tcp_forwarder/src/main/java/ch/elca/el4j/services/tcpforwarder/TcpForwarderRunner.java $
30 *
31 * @author Martin Zeltner (MZE)
32 */
33 public class TcpForwarderRunner {
34 /**
35 * Hide default constructor.
36 */
37 protected TcpForwarderRunner() { }
38
39 /**
40 * Runs a tcp forwarder on a given port and forwards the tcp messages to
41 * the given target address.
42 *
43 * @param args
44 * The first argument is the local listening port and the second
45 * argument is the local port or remote target with its port to
46 * forward to.
47 */
48 public static void main(String[] args) {
49 int listeningPort = 0;
50 InetSocketAddress targetAddress = null;
51 if (args.length != 2) {
52 printUsage();
53 } else {
54 try {
55 listeningPort = Integer.parseInt(args[0]);
56
57 String target = args[1];
58 String targetHost = null;
59 int targetPort = 0;
60 if (StringUtils.hasText(target)) {
61 int i = target.indexOf(':');
62 if (i > 0) {
63 targetHost = target.substring(0, i);
64 }
65 if (i < target.length() - 1) {
66 targetPort = Integer.parseInt(target.substring(i + 1));
67 }
68 }
69 if (targetHost == null) {
70 targetAddress = new InetSocketAddress(targetPort);
71 } else {
72 targetAddress
73 = new InetSocketAddress(targetHost, targetPort);
74 }
75 } catch (Exception e) {
76 e.printStackTrace();
77 printUsage();
78 }
79 }
80
81 if (listeningPort <= 0 || targetAddress == null) {
82 return;
83 }
84
85 new TcpForwarder(listeningPort, targetAddress);
86 }
87
88 /**
89 * Prints the usage of this main class.
90 */
91 protected static void printUsage() {
92 System.out.println(
93 "Usage: java TcpForwarderRunner listeningPort targetAddress");
94 System.out.println(
95 " Example: java TcpForwarderRunner 6786 tulipe.elca.ch:1521");
96 }
97 }
98 // Checkstyle: UseLogger on
99 // Checkstyle: UncommentedMain on