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/*
* Copyright (c) 2003, 2023, 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.
*/
/*
* A Launcher to launch a java process with its standard input, output,
* and error streams connected to a socket.
*/
import java.io.IOException;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.SocketAddress;
import java.net.StandardProtocolFamily;
import java.net.UnixDomainSocketAddress;
import java.nio.channels.DatagramChannel;
import java.nio.channels.ServerSocketChannel;
import java.nio.channels.SocketChannel;
import java.nio.file.Files;
import static java.net.StandardProtocolFamily.INET;
import static java.net.StandardProtocolFamily.UNIX;
public class Launcher {
static {
System.loadLibrary("InheritedChannel");
}
private static native void launch0(String cmdarray[], int fd) throws IOException;
private static void launch(String className, String options[], String args[], int fd) throws IOException {
// java [-options] class [args...]
int optsLen = (options == null) ? 0 : options.length;
int argsLen = (args == null) ? 0 : args.length;
int len = 1 + optsLen + 1 + argsLen;
String cmdarray[] = new String[len];
int pos = 0;
cmdarray[pos++] = Util.javaCommand();
if (options != null) {
for (String opt: options) {
cmdarray[pos++] = opt;
}
}
cmdarray[pos++] = className;
if (args != null) {
for (String arg: args) {
cmdarray[pos++] = arg;
}
}
launch0(cmdarray, fd);
}
/**
* Launch 'java' with specified class. The launched process will inherit
* a connected Unix Domain socket. The remote endpoint will be the
* SocketChannel returned by this method.
*/
public static SocketChannel launchWithUnixSocketChannel(String className)
throws IOException
{
UnixDomainSocketAddress addr = null;
try (ServerSocketChannel ssc = ServerSocketChannel.open(UNIX)) {
addr = (UnixDomainSocketAddress)ssc.bind(null).getLocalAddress();
SocketChannel sc1 = SocketChannel.open(addr);
try (SocketChannel sc2 = ssc.accept()) {
launch(className, null, null, Util.getFD(sc2));
}
return sc1;
} finally {
if (addr != null)
Files.delete(addr.getPath());
}
}
/**
* Launch 'java' with specified class with the specified arguments (may be null).
* The launched process will inherit a connected TCP socket. The remote endpoint
* will be the SocketChannel returned by this method.
*/
public static SocketChannel launchWithInetSocketChannel(String className,
String options[],
String... args)
throws IOException
{
ServerSocketChannel ch;
try {
ch = ServerSocketChannel.open(INET);
System.out.println("Using INET (IPv4) channel");
} catch (Exception e) {
ch = ServerSocketChannel.open();
System.out.println("Using default channel (probably IPv6)");
}
try (ServerSocketChannel ssc = ch) {
ssc.socket().bind(new InetSocketAddress(InetAddress.getLoopbackAddress(), 0));
System.out.println("Socket bound to " + ssc.getLocalAddress());
SocketChannel sc1 = SocketChannel.open(ssc.getLocalAddress());
try (SocketChannel sc2 = ssc.accept()) {
launch(className, options, args, Util.getFD(sc2));
}
return sc1;
}
}
/**
* Launch specified class with a SocketChannel created externally.
*/
public static void launchWithSocketChannel(String className,
SocketChannel sc,
String[] options,
String... args) throws Exception {
launch(className, options, args, Util.getFD(sc));
}
/**
* Launch 'java' with specified class with the specified arguments (may be null).
* The launched process will inherited a TCP listener socket.
* Once launched this method tries to connect to service. If a connection
* can be established a SocketChannel, connected to the service, is returned.
*/
public static SocketChannel launchWithInetServerSocketChannel(String className,
String[] options,
String... args)
throws IOException
{
try (ServerSocketChannel ssc = ServerSocketChannel.open()) {
ssc.socket().bind(new InetSocketAddress(InetAddress.getLocalHost(), 0));
int port = ssc.socket().getLocalPort();
launch(className, options, args, Util.getFD(ssc));
InetSocketAddress isa = new InetSocketAddress(InetAddress.getLocalHost(), port);
return SocketChannel.open(isa);
}
}
public static SocketChannel launchWithUnixServerSocketChannel(String className) throws IOException {
ServerSocketChannel ssc = ServerSocketChannel.open(StandardProtocolFamily.UNIX);
ssc.bind(null);
var addr = ssc.getLocalAddress();
launch(className, null, null, Util.getFD(ssc));
ssc.close();
return SocketChannel.open(addr);
}
/**
* Launch specified class with a ServerSocketChannel created externally.
*/
public static void launchWithServerSocketChannel(String className,
ServerSocketChannel ssc,
String[] options,
String... args)
throws Exception {
launch(className, options, args, Util.getFD(ssc));
}
/**
* Launch 'java' with specified class with the specified arguments (may be null).
* The launch process will inherited a bound UDP socket.
* Once launched this method creates a DatagramChannel and "connects
* it to the service. The created DatagramChannel is then returned.
* As it is connected any packets sent from the socket will be
* sent to the service.
*/
public static DatagramChannel launchWithDatagramChannel(String className,
String[] options,
String... args)
throws IOException {
InetAddress address = InetAddress.getLocalHost();
if (address.isLoopbackAddress()) {
address = InetAddress.getLoopbackAddress();
}
DatagramChannel dc = DatagramChannel.open();
dc.socket().bind(new InetSocketAddress(address, 0));
int port = dc.socket().getLocalPort();
launch(className, options, args, Util.getFD(dc));
dc.close();
dc = DatagramChannel.open();
InetSocketAddress isa = new InetSocketAddress(address, port);
dc.connect(isa);
return dc;
}
}
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