/*
 * Copyright (c) 2005, 2015, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * questions.
 */

import java.net.Socket;

import com.sun.jdi.Bootstrap;
import com.sun.jdi.VirtualMachine;
import com.sun.jdi.event.*;
import com.sun.jdi.connect.Connector;
import com.sun.jdi.connect.AttachingConnector;
import com.sun.jdi.connect.Connector.Argument;

import java.util.Map;
import java.util.List;
import java.util.Iterator;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;

import jdk.testlibrary.Utils;
import jdk.testlibrary.ProcessTools;

/* @test
 * @bug 6306165 6432567
 * @summary Check that a bad handshake doesn't cause a debuggee to abort
 * @library /lib/testlibrary
 *
 * @modules java.management
 *          jdk.jdi
 * @build jdk.testlibrary.* VMConnection BadHandshakeTest Exit0
 * @run driver BadHandshakeTest
 */
public class BadHandshakeTest {

    /*
     * Find a connector by name
     */
    private static Connector findConnector(String name) {
        List<Connector> connectors = Bootstrap.virtualMachineManager().allConnectors();
        Iterator<Connector> iter = connectors.iterator();
        while (iter.hasNext()) {
            Connector connector = (Connector)iter.next();
            if (connector.name().equals(name)) {
                return connector;
            }
        }
        return null;
    }

    /*
     * Launch a server debuggee with the given address
     */
    private static LaunchResult launch(String address, String class_name) throws Exception {
        String[] args = VMConnection.insertDebuggeeVMOptions(new String[] {
            "-agentlib:jdwp=transport=dt_socket" +
            ",server=y" + ",suspend=y" + ",address=" + address,
            class_name
        });

        ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(args);

        final AtomicBoolean success = new AtomicBoolean();
        final AtomicBoolean bindFailed = new AtomicBoolean();
        Process p = ProcessTools.startProcess(
            class_name,
            pb,
            (line) -> {
                // 'Listening for transport dt_socket at address: xxxxx'
                // indicates the debuggee is ready to accept connections
                if (line.contains("Listening for transport dt_socket at address:")) {
                    success.set(true);
                    return true;
                }
                // 'Address already in use' indicates
                // the debuggee has failed to start due to busy port.
                if (line.contains("Address already in use")) {
                    bindFailed.set(true);
                    return true;
                }
                return false;
            },
            Integer.MAX_VALUE,
            TimeUnit.MILLISECONDS
        );

        return new LaunchResult(success.get() ? p : null,
                bindFailed.get());
    }

    /*
     * - pick a TCP port
     * - Launch a server debuggee: server=y,suspend=y,address=${port}
     * - run it to VM death
     * - verify we saw no error
     */
    public static void main(String args[]) throws Exception {
        // Launch the server debuggee
        int port = 0;
        Process process = null;
        while (process == null) {
            port = Utils.getFreePort();
            String address = String.valueOf(port);
            LaunchResult launchResult = launch(address, "Exit0");
            process = launchResult.getProcess();
            if (launchResult.isBindFailed()) {
                System.out.println("Port " + port + " already in use. Trying to restart debuggee with a new one...");
                Thread.sleep(100);
            } else if (process == null ) {
                throw new RuntimeException("Unable to start debugee");
            }
        }

        // Connect to the debuggee and handshake with garbage
        Socket s = new Socket("localhost", port);
        s.getOutputStream().write("Here's a poke in the eye".getBytes("UTF-8"));
        s.close();

        // Re-connect and to a partial handshake - don't disconnect
        s = new Socket("localhost", port);
        s.getOutputStream().write("JDWP-".getBytes("UTF-8"));


        // Attach to server debuggee and resume it so it can exit
        AttachingConnector conn = (AttachingConnector)findConnector("com.sun.jdi.SocketAttach");
        Map<String, Argument> conn_args = conn.defaultArguments();
        Connector.IntegerArgument port_arg =
            (Connector.IntegerArgument)conn_args.get("port");
        port_arg.setValue(port);
        VirtualMachine vm = conn.attach(conn_args);

        // The first event is always a VMStartEvent, and it is always in
        // an EventSet by itself.  Wait for it.
        EventSet evtSet = vm.eventQueue().remove();
        for (Event event: evtSet) {
            if (event instanceof VMStartEvent) {
                break;
            }
            throw new RuntimeException("Test failed - debuggee did not start properly");
        }

        vm.eventRequestManager().deleteAllBreakpoints();
        vm.resume();

        process.waitFor();
    }

    private static class LaunchResult {

        private final Process p;
        private final boolean bindFailed;

        public LaunchResult(Process p, boolean bindFailed) {
            this.p = p;
            this.bindFailed = bindFailed;
        }

        public Process getProcess() {
            return p;
        }

        public boolean isBindFailed() {
            return bindFailed;
        }

    }

}