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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 2014 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 io.undertow.server.handlers;

import io.undertow.UndertowLogger;
import io.undertow.server.HandlerWrapper;
import io.undertow.server.HttpHandler;
import io.undertow.server.HttpServerExchange;
import io.undertow.server.handlers.builder.HandlerBuilder;

import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.UnknownHostException;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.security.PrivilegedExceptionAction;
import java.util.Collections;
import java.util.Map;
import java.util.Set;

/**
 * A handler that performs DNS lookup to resolve a local address. Unresolved local address may be created when a front
 * end server has sent a X-forwarded-host header or AJP is in use
 *
 * @author Stuart Douglas
 */
public class LocalNameResolvingHandler implements HttpHandler {

    private final HttpHandler next;
    private final ResolveType resolveType;

    public LocalNameResolvingHandler(HttpHandler next) {
        this.next = next;
        this.resolveType = ResolveType.FORWARD_AND_REVERSE;
    }

    public LocalNameResolvingHandler(HttpHandler next, ResolveType resolveType) {
        this.next = next;
        this.resolveType = resolveType;
    }

    @Override
    public void handleRequest(final HttpServerExchange exchange) throws Exception {
        final InetSocketAddress address = exchange.getDestinationAddress();
        if (address != null) {
            if ((resolveType == ResolveType.FORWARD || resolveType == ResolveType.FORWARD_AND_REVERSE)
                    && address.isUnresolved()) {
                try {
                    if (System.getSecurityManager() == null) {
                        final InetSocketAddress resolvedAddress = new InetSocketAddress(InetAddress.getByName(address.getHostName()), address.getPort());
                        exchange.setDestinationAddress(resolvedAddress);
                    } else {
                        AccessController.doPrivileged(new PrivilegedExceptionAction() {
                            @Override
                            public Object run() throws UnknownHostException {
                                final InetSocketAddress resolvedAddress = new InetSocketAddress(InetAddress.getByName(address.getHostName()), address.getPort());
                                exchange.setDestinationAddress(resolvedAddress);
                                return null;
                            }
                        });
                    }
                } catch (UnknownHostException e) {
                    UndertowLogger.REQUEST_LOGGER.debugf(e, "Could not resolve hostname %s", address.getHostString());
                }

            } else if (resolveType == ResolveType.REVERSE || resolveType == ResolveType.FORWARD_AND_REVERSE) {
                if (System.getSecurityManager() == null) {
                    address.getHostName();
                } else {
                    AccessController.doPrivileged(new PrivilegedAction() {
                        @Override
                        public Object run() {
                            address.getHostName();
                            return null;
                        }
                    });
                }
                //we call set source address because otherwise the underlying channel could just return a new address
                exchange.setDestinationAddress(address);
            }
        }

        next.handleRequest(exchange);
    }

    public enum ResolveType {
        FORWARD,
        REVERSE,
        FORWARD_AND_REVERSE

    }

    public static class Builder implements HandlerBuilder {

        @Override
        public String name() {
            return "resolve-local-name";
        }

        @Override
        public Map> parameters() {
            return Collections.emptyMap();
        }

        @Override
        public Set requiredParameters() {
            return Collections.emptySet();
        }

        @Override
        public String defaultParameter() {
            return null;
        }

        @Override
        public HandlerWrapper build(Map config) {
            return new Wrapper();
        }

    }

    private static class Wrapper implements HandlerWrapper {
        @Override
        public HttpHandler wrap(HttpHandler handler) {
            return new LocalNameResolvingHandler(handler);
        }
    }


}
    

    

    

            

    

            



    
    






    
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