--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/fschmidt/tools/TcpProxy.java	Sun Oct 05 17:24:15 2025 -0600
@@ -0,0 +1,91 @@
+/*
+Copyright (c) 2009  Franklin Schmidt <fschmidt@gmail.com>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+*/
+
+package fschmidt.tools;
+
+import fschmidt.util.java.IoUtils;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.IOException;
+import java.net.InetSocketAddress;
+import java.net.ServerSocket;
+import java.net.Socket;
+import java.net.SocketAddress;
+import java.util.concurrent.Executor;
+import java.util.concurrent.Executors;
+
+
+public final class TcpProxy {
+	private static final Logger logger = LoggerFactory.getLogger(TcpProxy.class);
+
+	private static final Executor exec = Executors.newCachedThreadPool();
+
+	// never returns
+	public static void proxy(SocketAddress from,final SocketAddress to) throws IOException {
+		final ServerSocket server = new ServerSocket();
+		server.bind(from);
+		while(true) {
+			final Socket client = server.accept();
+			exec.execute(new Runnable(){public void run() {
+				final Socket proxy = new Socket();
+				try {
+					proxy.connect(to);
+					exec.execute(new Runnable(){public void run() {
+						try {
+							IoUtils.copyAll( proxy.getInputStream(), client.getOutputStream() );
+						} catch(IOException e) {
+							logger.debug("",e);
+						}
+					}});
+					IoUtils.copyAll( client.getInputStream(), proxy.getOutputStream() );
+				} catch(IOException e) {
+					logger.debug("",e);
+				} finally {
+					try {
+						proxy.close();
+					} catch(IOException e) {}
+					try {
+						client.close();
+					} catch(IOException e) {}
+				}
+			}});
+		}
+	}
+
+	private static SocketAddress parseSocketAddress(String s) {
+		String[] a = s.split(":");
+		return new InetSocketAddress( a[0], Integer.parseInt(a[1]) );
+	}
+
+	public static void proxy(String from,String to) throws IOException {
+		proxy(parseSocketAddress(from), parseSocketAddress(to));
+	}
+
+	// better to write your own main()
+	public static void main(String[] args) throws IOException {
+		org.apache.log4j.Logger.getRootLogger().setLevel(org.apache.log4j.Level.INFO);
+		org.apache.log4j.BasicConfigurator.configure();
+		proxy(args[0], args[1]);
+	}
+
+}