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/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch licenses this file to you 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.elasticsearch.bootstrap;
import org.apache.logging.log4j.Logger;
import org.elasticsearch.common.logging.Loggers;
import java.nio.file.Path;
/**
* The Natives class is a wrapper class that checks if the classes necessary for calling native methods are available on
* startup. If they are not available, this class will avoid calling code that loads these classes.
*/
final class Natives {
/** no instantiation */
private Natives() {}
private static final Logger logger = Loggers.getLogger(Natives.class);
// marker to determine if the JNA class files are available to the JVM
static final boolean JNA_AVAILABLE;
static {
boolean v = false;
try {
// load one of the main JNA classes to see if the classes are available. this does not ensure that all native
// libraries are available, only the ones necessary by JNA to function
Class.forName("com.sun.jna.Native");
v = true;
} catch (ClassNotFoundException e) {
logger.warn("JNA not found. native methods will be disabled.", e);
} catch (UnsatisfiedLinkError e) {
logger.warn("unable to load JNA native support library, native methods will be disabled.", e);
}
JNA_AVAILABLE = v;
}
static void tryMlockall() {
if (!JNA_AVAILABLE) {
logger.warn("cannot mlockall because JNA is not available");
return;
}
JNANatives.tryMlockall();
}
static boolean definitelyRunningAsRoot() {
if (!JNA_AVAILABLE) {
logger.warn("cannot check if running as root because JNA is not available");
return false;
}
return JNANatives.definitelyRunningAsRoot();
}
static void tryVirtualLock() {
if (!JNA_AVAILABLE) {
logger.warn("cannot mlockall because JNA is not available");
return;
}
JNANatives.tryVirtualLock();
}
static void addConsoleCtrlHandler(ConsoleCtrlHandler handler) {
if (!JNA_AVAILABLE) {
logger.warn("cannot register console handler because JNA is not available");
return;
}
JNANatives.addConsoleCtrlHandler(handler);
}
static boolean isMemoryLocked() {
if (!JNA_AVAILABLE) {
return false;
}
return JNANatives.LOCAL_MLOCKALL;
}
static void trySeccomp(Path tmpFile) {
if (!JNA_AVAILABLE) {
logger.warn("cannot install syscall filters because JNA is not available");
return;
}
JNANatives.trySeccomp(tmpFile);
}
static void trySetMaxNumberOfThreads() {
if (!JNA_AVAILABLE) {
logger.warn("cannot getrlimit RLIMIT_NPROC because JNA is not available");
return;
}
JNANatives.trySetMaxNumberOfThreads();
}
static void trySetMaxSizeVirtualMemory() {
if (!JNA_AVAILABLE) {
logger.warn("cannot getrlimit RLIMIT_AS beacuse JNA is not available");
return;
}
JNANatives.trySetMaxSizeVirtualMemory();
}
static boolean isSeccompInstalled() {
if (!JNA_AVAILABLE) {
return false;
}
return JNANatives.LOCAL_SECCOMP;
}
}