126 lines
4.4 KiB
Java
126 lines
4.4 KiB
Java
/*
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* Copyright © 2017-2019 WireGuard LLC. All Rights Reserved.
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* SPDX-License-Identifier: Apache-2.0
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*/
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package com.wireguard.config;
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import androidx.annotation.Nullable;
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import org.threeten.bp.Duration;
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import org.threeten.bp.Instant;
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import java.net.Inet4Address;
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import java.net.InetAddress;
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import java.net.URI;
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import java.net.URISyntaxException;
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import java.net.UnknownHostException;
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import java.util.regex.Pattern;
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import java9.util.Optional;
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/**
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* An external endpoint (host and port) used to connect to a WireGuard {@link Peer}.
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* <p>
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* Instances of this class are externally immutable.
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*/
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public final class InetEndpoint {
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private static final Pattern BARE_IPV6 = Pattern.compile("^[^\\[\\]]*:[^\\[\\]]*");
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private static final Pattern FORBIDDEN_CHARACTERS = Pattern.compile("[/?#]");
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private final String host;
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private final boolean isResolved;
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private final Object lock = new Object();
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private final int port;
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private Instant lastResolution = Instant.EPOCH;
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@Nullable private InetEndpoint resolved;
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private InetEndpoint(final String host, final boolean isResolved, final int port) {
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this.host = host;
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this.isResolved = isResolved;
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this.port = port;
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}
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public static InetEndpoint parse(final String endpoint) throws ParseException {
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if (FORBIDDEN_CHARACTERS.matcher(endpoint).find())
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throw new ParseException(InetEndpoint.class, endpoint, "Forbidden characters");
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final URI uri;
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try {
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uri = new URI("wg://" + endpoint);
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} catch (final URISyntaxException e) {
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throw new IllegalArgumentException(e);
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}
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if (uri.getPort() < 0 || uri.getPort() > 65535)
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throw new ParseException(InetEndpoint.class, endpoint, "Missing/invalid port number");
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try {
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InetAddresses.parse(uri.getHost());
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// Parsing ths host as a numeric address worked, so we don't need to do DNS lookups.
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return new InetEndpoint(uri.getHost(), true, uri.getPort());
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} catch (final ParseException ignored) {
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// Failed to parse the host as a numeric address, so it must be a DNS hostname/FQDN.
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return new InetEndpoint(uri.getHost(), false, uri.getPort());
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}
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}
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@Override
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public boolean equals(final Object obj) {
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if (!(obj instanceof InetEndpoint))
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return false;
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final InetEndpoint other = (InetEndpoint) obj;
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return host.equals(other.host) && port == other.port;
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}
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public String getHost() {
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return host;
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}
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public int getPort() {
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return port;
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}
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/**
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* Generate an {@code InetEndpoint} instance with the same port and the host resolved using DNS
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* to a numeric address. If the host is already numeric, the existing instance may be returned.
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* Because this function may perform network I/O, it must not be called from the main thread.
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*
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* @return the resolved endpoint, or {@link Optional#empty()}
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*/
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public Optional<InetEndpoint> getResolved() {
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if (isResolved)
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return Optional.of(this);
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synchronized (lock) {
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//TODO(zx2c4): Implement a real timeout mechanism using DNS TTL
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if (Duration.between(lastResolution, Instant.now()).toMinutes() > 1) {
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try {
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// Prefer v4 endpoints over v6 to work around DNS64 and IPv6 NAT issues.
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final InetAddress[] candidates = InetAddress.getAllByName(host);
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InetAddress address = candidates[0];
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for (final InetAddress candidate : candidates) {
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if (candidate instanceof Inet4Address) {
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address = candidate;
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break;
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}
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}
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resolved = new InetEndpoint(address.getHostAddress(), true, port);
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lastResolution = Instant.now();
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} catch (final UnknownHostException e) {
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resolved = null;
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}
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}
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return Optional.ofNullable(resolved);
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}
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}
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@Override
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public int hashCode() {
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return host.hashCode() ^ port;
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}
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@Override
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public String toString() {
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final boolean isBareIpv6 = isResolved && BARE_IPV6.matcher(host).matches();
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return (isBareIpv6 ? '[' + host + ']' : host) + ':' + port;
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}
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}
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