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/*
* Copyright (c) 2022, 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
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
import java.io.IOException;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.nio.ByteBuffer;
import java.nio.channels.Channel;
import java.nio.channels.SocketChannel;
public class CheckIPv6Service {
static boolean isIPv6Available() {
try {
new ServerSocket(0,0, InetAddress.getByAddress(new byte[16])).close();
return true;
} catch (Exception e) {
return false;
}
}
private static void doIt(SocketChannel sc, int closeAfter, int delay) throws IOException {
ByteBuffer bb = ByteBuffer.allocate(1024);
int total = 0;
for (;;) {
bb.clear();
int n = sc.read(bb);
if (n < 0) {
break;
}
total += n;
// echo
bb.flip();
sc.write(bb);
// close after X bytes?
if (closeAfter > 0 && total >= closeAfter) {
break;
}
}
sc.close();
if (delay > 0) {
try {
Thread.currentThread().sleep(delay);
} catch (InterruptedException x) { }
}
}
public static void main(String args[]) throws IOException {
// check if IPv6 is available; if it is, behave like EchoService.
if (!isIPv6Available()) {
return;
}
Channel c = System.inheritedChannel();
if (c == null) {
return;
}
if (c instanceof SocketChannel) {
int closeAfter = 0;
int delay = 0;
if (args.length > 0) {
closeAfter = Integer.parseInt(args[0]);
}
if (args.length > 1) {
delay = Integer.parseInt(args[1]);
}
doIt((SocketChannel)c, closeAfter, delay);
}
}
}
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