// Copyright 2017 JanusGraph Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package org.janusgraph.util.system;
import java.net.InetAddress;
import java.net.Socket;
/*
* This doesn't really belong here. It's only used in the zipfile
* distribution to check whether Gremlin Server or ES are listening on
* their respective TCP ports. But it's so tiny that I don't want
* to reorganize the repo to accommodate it (yet).
*
* Many widely available *NIX programs do this task better (e.g.
* netcat, telnet, nmap, socat, ... we could even use netstat since
* we're interested only in the status of local ports). But we want
* to keep the JanusGraph distribution self-contained insofar as is
* reasonable.
*/
public class CheckSocket {
public static final int E_USAGE = 1;
public static final int E_FAILED = 2;
public static final String MSG_USAGE =
"Usage: " + CheckSocket.class.getSimpleName() + " hostname port";
public static void main(String args[]) {
if (2 != args.length) {
System.err.println(MSG_USAGE);
System.exit(E_USAGE);
}
try {
Socket s = new Socket(
InetAddress.getByName(args[0]),
Integer.valueOf(args[1]).intValue());
s.close();
System.exit(0);
} catch (Throwable t) {
System.err.println(t.toString());
System.exit(E_FAILED);
}
}
}