package it.unimi.di.law.bubing.frontier.dns; /* * Copyright (C) 2013-2017 Paolo Boldi, Massimo Santini, and Sebastiano Vigna * * 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. */ import it.unimi.di.law.bubing.RuntimeConfiguration; import it.unimi.di.law.bubing.frontier.Frontier; import java.net.InetAddress; import java.net.UnknownHostException; import org.apache.http.conn.DnsResolver; import org.xbill.DNS.Address; //RELEASE-STATUS: DIST /** A resolver based on <a href="http://www.xbill.org/dnsjava/">dnsjava</a>. */ public final class DnsJavaResolver implements DnsResolver { @Override public InetAddress[] resolve(String hostname) throws UnknownHostException { if ("localhost".equals(hostname)) return Frontier.LOOPBACK; // DnsJava does not understand dotted-notation IP addresses with additional zeroes (e.g., 127.0.0.01). if (RuntimeConfiguration.DOTTED_ADDRESS.matcher(hostname).matches()) return InetAddress.getAllByName(hostname); // This avoid expensive trials with domain suffixes (but must not be applied to dotted-notation IP addresses). hostname = hostname.endsWith(".") ? hostname : hostname + "."; return Address.getAllByName(hostname); } }