org.wildfly.common.net.Substitutions Maven / Gradle / Ivy
/*
* JBoss, Home of Professional Open Source.
* Copyright 2018 Red Hat, Inc., and individual contributors
* as indicated by the @author tags.
*
* 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.wildfly.common.net;
import java.net.UnknownHostException;
import java.util.Collections;
import java.util.List;
import com.oracle.svm.core.annotate.Substitute;
import com.oracle.svm.core.annotate.TargetClass;
import org.graalvm.nativeimage.StackValue;
import org.graalvm.nativeimage.c.CContext;
import org.graalvm.nativeimage.c.function.CFunction;
import org.graalvm.nativeimage.c.type.CCharPointer;
import org.graalvm.nativeimage.c.type.CTypeConversion;
import org.graalvm.word.UnsignedWord;
import org.graalvm.word.WordFactory;
/**
*/
final class Substitutions {
@TargetClass(className = "org.wildfly.common.net.GetHostInfoAction")
static final class Target_org_wildfly_common_net_GetHostInfoAction {
@Substitute
public String[] run() {
// still allow host name to be overridden
String qualifiedHostName = System.getProperty("jboss.qualified.host.name");
String providedHostName = System.getProperty("jboss.host.name");
String providedNodeName = System.getProperty("jboss.node.name");
if (qualifiedHostName == null) {
// if host name is specified, don't pick a qualified host name that isn't related to it
qualifiedHostName = providedHostName;
if (qualifiedHostName == null) {
// query the operating system
CCharPointer nameBuf = StackValue.get(ProcessSubstitutions.SIZE); // should be more than enough
int res = NativeInfo.gethostname(nameBuf, WordFactory.unsigned(ProcessSubstitutions.SIZE));
if (res != -1 && res > 0) {
if (res == ProcessSubstitutions.SIZE) {
// null-terminate a really long name
nameBuf.write(ProcessSubstitutions.SIZE - 1, (byte) 0);
}
qualifiedHostName = CTypeConversion.toJavaString(nameBuf);
}
}
if (qualifiedHostName == null) {
// POSIX-like OSes including Mac should have this set
qualifiedHostName = System.getenv("HOSTNAME");
}
if (qualifiedHostName == null) {
// Certain versions of Windows
qualifiedHostName = System.getenv("COMPUTERNAME");
}
if (qualifiedHostName == null) {
try {
qualifiedHostName = HostName.getLocalHost().getHostName();
} catch (UnknownHostException e) {
qualifiedHostName = null;
}
}
if (qualifiedHostName != null && (Inet.isInet4Address(qualifiedHostName) || Inet.isInet6Address(qualifiedHostName))) {
// IP address is not acceptable
qualifiedHostName = null;
}
if (qualifiedHostName == null) {
// Give up
qualifiedHostName = "unknown-host.unknown-domain";
} else {
qualifiedHostName = qualifiedHostName.trim().toLowerCase();
}
}
if (providedHostName == null) {
// Use the host part of the qualified host name
final int idx = qualifiedHostName.indexOf('.');
providedHostName = idx == - 1 ? qualifiedHostName : qualifiedHostName.substring(0, idx);
}
if (providedNodeName == null) {
providedNodeName = providedHostName;
}
return new String[] {
providedHostName,
qualifiedHostName,
providedNodeName
};
}
}
@CContext(NativeInfoDirectives.class)
static final class NativeInfo {
@CFunction
static native int gethostname(CCharPointer nameBuf, UnsignedWord /* size_t */ len);
}
static final class NativeInfoDirectives implements CContext.Directives {
public List getHeaderFiles() {
return Collections.singletonList("");
}
}
static final class ProcessSubstitutions {
static final int SIZE = 512;
}
}