/*
* This file is part of Spoutcraft.
*
* Copyright (c) 2011 SpoutcraftDev <http://spoutcraft.org/>
* Spoutcraft is licensed under the GNU Lesser General Public License.
*
* Spoutcraft is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Spoutcraft is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.spoutcraft.client.util;
import java.awt.Desktop;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.InetSocketAddress;
import java.net.URISyntaxException;
import java.net.URL;
import java.util.regex.Pattern;
import org.xbill.DNS.Lookup;
import org.xbill.DNS.Record;
import org.xbill.DNS.SRVRecord;
import org.xbill.DNS.TextParseException;
import org.xbill.DNS.Type;
import org.spoutcraft.client.gui.server.ServerItem;
public class NetworkUtils {
/**
* A {@link Pattern} matching valid DNS hostnames (as opposed to IP addresses).
*/
private static final Pattern HOSTNAME_PATTERN = Pattern.compile("[a-zA-Z-]");
public static void pingUrl(String Url) {
try {
URL url = new URL(Url);
HttpURLConnection con = (HttpURLConnection)(url.openConnection());
System.setProperty("http.agent", "");
con.setRequestProperty("User-Agent", "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/534.30 (KHTML, like Gecko) Chrome/12.0.742.100 Safari/534.30");
BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream()));
String str;
while ((str = in.readLine()) != null);
in.close();
} catch (Exception e) {
}
}
public static void openInBrowser(String url) {
try {
java.net.URI uri = new java.net.URI(url);
Desktop desktop = Desktop.getDesktop();
desktop.browse(uri);
} catch (IOException e) {
e.printStackTrace();
} catch (URISyntaxException e) {
e.printStackTrace();
}
}
/**
* Resolves a hostname to an {@link InetSocketAddress}, encapsulating an IP address and
* port. <code>hostname</code> may represent a valid DNS hostname or an IP address. If
* <code>hostname</code> is a valid DNS hostname <em>and</em> <code>port</code> is equal
* to {@link ServerItem#DEFAULT_PORT} (implying the user may not have specified a server
* port), a <a href="http://en.wikipedia.org/wiki/SRV_record">SRV record</a> lookup may
* be attempted—see {@link #resolve(String)} for implementation details.
* <p>
* This method is the equivalent of passing <code>true</code> to {@link #resolve(String, int, boolean)}.
*
* @param hostname the DNS hostname to resolve.
* @param port the port number to encapsulate within the <code>InetSocketAddress</code>.
* @return an {@link InetSocketAddress}, which may be marked unresolved if hostname lookup failed.
*/
public static InetSocketAddress resolve(String hostname, int port) {
return resolve(hostname, port, true);
}
/**
* Resolves a hostname to an {@link InetSocketAddress}, encapsulating an IP address and
* port. An optional <a href="http://en.wikipedia.org/wiki/SRV_record">SRV record</a>
* lookup may be attempted—see {@link #resolve(String)} for implementation details.
* A SRV record lookup will only be attempted if <code>hostname</code> represents a valid
* DNS hostname, and <code>port</code> is equal to {@link ServerItem#DEFAULT_PORT} (implying
* the user may not have specified a server port).
* <p>
* If <code>srv</code> is <code>true</code> and SRV record lookup fails or returns no
* results, a regular DNS lookup will be attempted.
* <p>
* If the given <code>hostname</code> represents an IP address, it will not be resolved.
*
* @param hostname the DNS hostname to resolve.
* @param port the port number to encapsulate within the <code>InetSocketAddress</code>.
* @param srv whether to attempt a SRV record lookup.
* @return an {@link InetSocketAddress}, which may be marked unresolved if hostname lookup failed.
*/
public static InetSocketAddress resolve(String hostname, int port, boolean srv) {
if (srv && (port == ServerItem.DEFAULT_PORT) && (HOSTNAME_PATTERN.matcher(hostname).find())) {
try {
InetSocketAddress address = resolve(hostname);
if (address != null) {
return address;
}
} catch (TextParseException e) {
// Do nothing: fall back on a regular DNS lookup before failing
}
}
return new InetSocketAddress(hostname, port);
}
/**
* Resolves a hostname to an {@link InetSocketAddress}, encapsulating an IP address and
* port, using a <a href="http://en.wikipedia.org/wiki/SRV_record">SRV record</a> lookup.
* This method assumes <code>minecraft</code> as the service name during the DNS query,
* such that a matching record looks like:
* <p>
* <code>_minecraft._tcp.example.com. 86400 IN SRV 0 1 25565 minecraft.example.com.</code>
* <p>
* If multiple SRV records exist for a given hostname, the record with the highest priority
* (that is, the lowest priority value) is selected. This implementation does not take
* into account relative weights for records with identical priorities, and behavior in
* such cases is undefined.
*
* @param hostname the DNS hostname to on which to perform a SRV lookup.
* @return an {@link InetSocketAddress}, or <code>null</code> if no SRV record was found.
* @throws TextParseException if the hostname is malformed.
*/
public static InetSocketAddress resolve(String hostname) throws TextParseException {
String query = "_minecraft._tcp." + hostname.trim();
Record[] records = new Lookup(query, Type.SRV).run();
if ((records != null) && (records.length > 0)) {
SRVRecord srv = (SRVRecord)records[0];
if (records.length > 1) {
for (int i = 1; i < records.length; i++) {
SRVRecord record = (SRVRecord)records[i];
if (record.getPriority() < srv.getPriority()) {
srv = record;
}
}
}
String host = srv.getTarget().toString().replaceAll("\\.+$", "");
int port = srv.getPort();
return new InetSocketAddress(host, port);
}
return null;
}
}