com.hazelcast.util.ICMPHelper Maven / Gradle / Ivy
/*
* Copyright (c) 2008-2018, Hazelcast, Inc. All Rights Reserved.
*
* 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 com.hazelcast.util;
import java.io.File;
import java.io.InputStream;
import static com.hazelcast.nio.IOUtil.closeResource;
import static com.hazelcast.nio.IOUtil.copy;
import static com.hazelcast.nio.IOUtil.getFileFromResourcesAsStream;
import static com.hazelcast.util.ExceptionUtil.rethrow;
import static com.hazelcast.util.JVMUtil.is32bitJVM;
import static com.hazelcast.util.OsHelper.OS;
import static com.hazelcast.util.OsHelper.isUnixFamily;
/**
* Helper class that uses JNI to check whether the JVM process has enough permission to create raw-sockets.
*/
public final class ICMPHelper {
static {
System.load(extractBundledLib());
}
private ICMPHelper() {
}
private static native boolean isRawSocketPermitted0();
public static boolean isRawSocketPermitted() {
return isRawSocketPermitted0();
}
private static String extractBundledLib() {
InputStream src = null;
try {
src = getFileFromResourcesAsStream(getBundledLibraryPath());
File dest = File.createTempFile("hazelcast-libicmp-helper-", ".so");
copy(src, dest);
return dest.getAbsolutePath();
} catch (Throwable t) {
throw rethrow(t);
} finally {
closeResource(src);
}
}
private static String getBundledLibraryPath() {
if (!isUnixFamily()) {
throw new IllegalStateException("ICMP not supported in this platform: " + OS);
}
return is32bitJVM()
? "lib/linux-x86/libicmp_helper.so"
: "lib/linux-x86_64/libicmp_helper.so";
}
}