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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up with different versions on classes on the class path).

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/*
 * 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.security.PrivilegedAction;
import java.util.regex.Pattern;

/**
 */
final class GetHostInfoAction implements PrivilegedAction {
    GetHostInfoAction() {
    }

    public String[] run() {
        // 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) {
                // 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 && Pattern.compile("^\\d+\\.\\d+\\.\\d+\\.\\d+$|:").matcher(qualifiedHostName).find()) {
                // 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
        };
    }
}