mirror of https://github.com/M66B/FairEmail.git
66 lines
2.5 KiB
Java
66 lines
2.5 KiB
Java
package eu.faircode.email;
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/*
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This file is part of FairEmail.
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FairEmail is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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FairEmail is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with FairEmail. If not, see <http://www.gnu.org/licenses/>.
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Copyright 2018-2022 by Marcel Bokhorst (M66B)
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*/
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import java.io.IOException;
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import java.net.InetSocketAddress;
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import java.net.Socket;
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import java.net.UnknownHostException;
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import java.nio.charset.StandardCharsets;
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public class Whois {
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// https://datatracker.ietf.org/doc/html/rfc3912
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static final String WHOIS_INFO = "https://en.wikipedia.org/wiki/WHOIS";
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private static final int WHOIS_PORT = 43;
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private static final int WHOIS_TIMEOUT = 15 * 1000; // milliseconds
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private static final String WHOIS_IANA = "whois.iana.org";
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private static final String WHOIS_PREFIX = "whois:";
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static String get(String domain) throws IOException {
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return get(domain, getServer(domain), WHOIS_PORT);
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}
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static String get(String domain, String host) throws IOException {
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return get(domain, host, WHOIS_PORT);
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}
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static String get(String domain, String host, int port) throws IOException {
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Socket socket = new Socket();
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socket.connect(new InetSocketAddress(host, port), WHOIS_TIMEOUT);
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try {
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byte[] request = (domain + "\r\n").getBytes(StandardCharsets.ISO_8859_1);
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socket.getOutputStream().write(request);
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String response = Helper.readStream(socket.getInputStream(), StandardCharsets.ISO_8859_1);
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return host + ":" + port + "\n\n" + response;
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} finally {
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socket.close();
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}
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}
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private static String getServer(String domain) throws IOException {
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String iana = get(domain, WHOIS_IANA);
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for (String line : iana.split("\\r?\\n"))
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if (line.startsWith(WHOIS_PREFIX))
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return line.substring(WHOIS_PREFIX.length()).trim();
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Log.w(iana);
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throw new UnknownHostException("whois server unknown " + domain);
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}
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}
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