300 lines
11 KiB
Java
300 lines
11 KiB
Java
package eu.siacs.conversations.utils;
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import android.annotation.TargetApi;
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import android.content.Context;
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import android.net.ConnectivityManager;
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import android.net.LinkProperties;
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import android.net.Network;
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import android.net.RouteInfo;
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import android.os.Build;
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import android.os.Bundle;
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import android.os.Parcelable;
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import android.util.Log;
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import java.io.IOException;
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import java.net.Inet4Address;
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import java.net.InetAddress;
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import java.net.SocketTimeoutException;
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import java.net.UnknownHostException;
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import java.util.ArrayList;
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import java.util.Collections;
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import java.util.List;
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import java.util.Locale;
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import java.util.Random;
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import java.util.TreeMap;
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import java.util.Map;
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import java.util.regex.Pattern;
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import de.measite.minidns.Client;
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import de.measite.minidns.DNSMessage;
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import de.measite.minidns.Record;
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import de.measite.minidns.Record.CLASS;
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import de.measite.minidns.Record.TYPE;
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import de.measite.minidns.record.A;
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import de.measite.minidns.record.AAAA;
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import de.measite.minidns.record.Data;
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import de.measite.minidns.record.SRV;
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import de.measite.minidns.util.NameUtil;
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import eu.siacs.conversations.Config;
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import eu.siacs.conversations.xmpp.jid.Jid;
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public class DNSHelper {
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public static final Pattern PATTERN_IPV4 = Pattern.compile("\\A(25[0-5]|2[0-4]\\d|[0-1]?\\d?\\d)(\\.(25[0-5]|2[0-4]\\d|[0-1]?\\d?\\d)){3}\\z");
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public static final Pattern PATTERN_IPV6_HEX4DECCOMPRESSED = Pattern.compile("\\A((?:[0-9A-Fa-f]{1,4}(?::[0-9A-Fa-f]{1,4})*)?) ::((?:[0-9A-Fa-f]{1,4}:)*)(25[0-5]|2[0-4]\\d|[0-1]?\\d?\\d)(\\.(25[0-5]|2[0-4]\\d|[0-1]?\\d?\\d)){3}\\z");
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public static final Pattern PATTERN_IPV6_6HEX4DEC = Pattern.compile("\\A((?:[0-9A-Fa-f]{1,4}:){6,6})(25[0-5]|2[0-4]\\d|[0-1]?\\d?\\d)(\\.(25[0-5]|2[0-4]\\d|[0-1]?\\d?\\d)){3}\\z");
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public static final Pattern PATTERN_IPV6_HEXCOMPRESSED = Pattern.compile("\\A((?:[0-9A-Fa-f]{1,4}(?::[0-9A-Fa-f]{1,4})*)?)::((?:[0-9A-Fa-f]{1,4}(?::[0-9A-Fa-f]{1,4})*)?)\\z");
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public static final Pattern PATTERN_IPV6 = Pattern.compile("\\A(?:[0-9a-fA-F]{1,4}:){7}[0-9a-fA-F]{1,4}\\z");
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protected static Client client = new Client();
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protected static Context context;
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public static Bundle getSRVRecord(final Jid jid, Context context) throws IOException {
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DNSHelper.context = context;
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final String host = jid.getDomainpart();
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final List<InetAddress> servers = Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP ? getDnsServers(context) : getDnsServersPreLollipop();
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Bundle b = new Bundle();
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boolean interrupted = false;
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for(InetAddress server : servers) {
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if (Thread.currentThread().isInterrupted()) {
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interrupted = true;
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break;
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}
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b = queryDNS(host, server);
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if (b.containsKey("values")) {
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return b;
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}
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}
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if (!b.containsKey("values")) {
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Log.d(Config.LOGTAG,(interrupted ? "Thread interrupted during DNS query" :"all dns queries failed") + ". provide fallback A record");
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ArrayList<Parcelable> values = new ArrayList<>();
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values.add(createNamePortBundle(host, 5222, false));
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b.putParcelableArrayList("values",values);
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}
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return b;
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}
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@TargetApi(21)
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private static List<InetAddress> getDnsServers(Context context) {
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List<InetAddress> servers = new ArrayList<>();
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ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
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Network[] networks = connectivityManager == null ? null : connectivityManager.getAllNetworks();
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if (networks == null) {
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return getDnsServersPreLollipop();
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}
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for(int i = 0; i < networks.length; ++i) {
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LinkProperties linkProperties = connectivityManager.getLinkProperties(networks[i]);
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if (linkProperties != null) {
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if (hasDefaultRoute(linkProperties)) {
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servers.addAll(0, getIPv4First(linkProperties.getDnsServers()));
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} else {
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servers.addAll(getIPv4First(linkProperties.getDnsServers()));
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}
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}
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}
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if (servers.size() > 0) {
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Log.d(Config.LOGTAG, "used lollipop variant to discover dns servers in " + networks.length + " networks");
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}
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return servers.size() > 0 ? servers : getDnsServersPreLollipop();
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}
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private static List<InetAddress> getIPv4First(List<InetAddress> in) {
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List<InetAddress> out = new ArrayList<>();
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for(InetAddress addr : in) {
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if (addr instanceof Inet4Address) {
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out.add(0, addr);
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} else {
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out.add(addr);
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}
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}
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return out;
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}
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@TargetApi(Build.VERSION_CODES.LOLLIPOP)
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private static boolean hasDefaultRoute(LinkProperties linkProperties) {
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for(RouteInfo route: linkProperties.getRoutes()) {
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if (route.isDefaultRoute()) {
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return true;
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}
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}
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return false;
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}
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private static List<InetAddress> getDnsServersPreLollipop() {
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List<InetAddress> servers = new ArrayList<>();
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String[] dns = client.findDNS();
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for(int i = 0; i < dns.length; ++i) {
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try {
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servers.add(InetAddress.getByName(dns[i]));
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} catch (UnknownHostException e) {
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//ignore
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}
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}
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return servers;
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}
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private static class TlsSrv {
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private final SRV srv;
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private final boolean tls;
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public TlsSrv(SRV srv, boolean tls) {
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this.srv = srv;
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this.tls = tls;
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}
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}
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private static void fillSrvMaps(final String qname, final InetAddress dnsServer, final Map<Integer, List<TlsSrv>> priorities, final Map<String, List<String>> ips4, final Map<String, List<String>> ips6, final boolean tls) throws IOException {
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final DNSMessage message = client.query(qname, TYPE.SRV, CLASS.IN, dnsServer.getHostAddress());
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for (Record[] rrset : new Record[][] { message.getAnswers(), message.getAdditionalResourceRecords() }) {
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for (Record rr : rrset) {
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Data d = rr.getPayload();
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final String name = rr.getName() != null ? rr.getName().toLowerCase(Locale.US) : null;
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if (d instanceof SRV && NameUtil.idnEquals(qname, name)) {
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SRV srv = (SRV) d;
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if (!priorities.containsKey(srv.getPriority())) {
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priorities.put(srv.getPriority(),new ArrayList<TlsSrv>());
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}
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priorities.get(srv.getPriority()).add(new TlsSrv(srv, tls));
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} else if (d instanceof SRV) {
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Log.d(Config.LOGTAG,"found unrecognized SRV record with name: "+name);
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}
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if (d instanceof A) {
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A a = (A) d;
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if (!ips4.containsKey(name)) {
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ips4.put(name, new ArrayList<String>());
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}
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ips4.get(name).add(a.toString());
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}
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if (d instanceof AAAA) {
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AAAA aaaa = (AAAA) d;
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if (!ips6.containsKey(name)) {
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ips6.put(name, new ArrayList<String>());
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}
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ips6.get(name).add("[" + aaaa.toString() + "]");
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}
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}
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}
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}
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public static Bundle queryDNS(String host, InetAddress dnsServer) {
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Bundle bundle = new Bundle();
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try {
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client.setTimeout(Config.SOCKET_TIMEOUT * 1000);
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final String qname = "_xmpp-client._tcp." + host.toLowerCase(Locale.US);
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final String tlsQname = "_xmpps-client._tcp." + host.toLowerCase(Locale.US);
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Log.d(Config.LOGTAG, "using dns server: " + dnsServer.getHostAddress() + " to look up " + host);
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final Map<Integer, List<TlsSrv>> priorities = new TreeMap<>();
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final Map<String, List<String>> ips4 = new TreeMap<>();
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final Map<String, List<String>> ips6 = new TreeMap<>();
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fillSrvMaps(qname, dnsServer, priorities, ips4, ips6, false);
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fillSrvMaps(tlsQname, dnsServer, priorities, ips4, ips6, true);
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final List<TlsSrv> result = new ArrayList<>();
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for (final List<TlsSrv> s : priorities.values()) {
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result.addAll(s);
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}
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final ArrayList<Bundle> values = new ArrayList<>();
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if (result.size() == 0) {
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DNSMessage response;
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try {
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response = client.query(host, TYPE.A, CLASS.IN, dnsServer.getHostAddress());
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for (int i = 0; i < response.getAnswers().length; ++i) {
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values.add(createNamePortBundle(host, 5222, response.getAnswers()[i].getPayload(), false));
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}
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} catch (SocketTimeoutException e) {
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Log.d(Config.LOGTAG,"ignoring timeout exception when querying A record on "+dnsServer.getHostAddress());
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}
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try {
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response = client.query(host, TYPE.AAAA, CLASS.IN, dnsServer.getHostAddress());
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for (int i = 0; i < response.getAnswers().length; ++i) {
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values.add(createNamePortBundle(host, 5222, response.getAnswers()[i].getPayload(), false));
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}
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} catch (SocketTimeoutException e) {
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Log.d(Config.LOGTAG,"ignoring timeout exception when querying AAAA record on "+dnsServer.getHostAddress());
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}
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values.add(createNamePortBundle(host, 5222, false));
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bundle.putParcelableArrayList("values", values);
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return bundle;
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}
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for (final TlsSrv tlsSrv : result) {
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final SRV srv = tlsSrv.srv;
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final String name = srv.getName() != null ? srv.getName().toLowerCase(Locale.US) : null;
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if (ips6.containsKey(name)) {
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values.add(createNamePortBundle(name,srv.getPort(),ips6, tlsSrv.tls));
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} else {
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try {
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DNSMessage response = client.query(name, TYPE.AAAA, CLASS.IN, dnsServer.getHostAddress());
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for (int i = 0; i < response.getAnswers().length; ++i) {
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values.add(createNamePortBundle(name, srv.getPort(), response.getAnswers()[i].getPayload(), tlsSrv.tls));
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}
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} catch (SocketTimeoutException e) {
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Log.d(Config.LOGTAG,"ignoring timeout exception when querying AAAA record on "+dnsServer.getHostAddress());
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}
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}
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if (ips4.containsKey(name)) {
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values.add(createNamePortBundle(name,srv.getPort(),ips4, tlsSrv.tls));
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} else {
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DNSMessage response = client.query(name, TYPE.A, CLASS.IN, dnsServer.getHostAddress());
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for(int i = 0; i < response.getAnswers().length; ++i) {
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values.add(createNamePortBundle(name,srv.getPort(),response.getAnswers()[i].getPayload(), tlsSrv.tls));
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}
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}
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values.add(createNamePortBundle(name, srv.getPort(), tlsSrv.tls));
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}
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bundle.putParcelableArrayList("values", values);
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} catch (SocketTimeoutException e) {
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bundle.putString("error", "timeout");
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} catch (Exception e) {
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bundle.putString("error", "unhandled");
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}
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return bundle;
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}
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private static Bundle createNamePortBundle(String name, int port, final boolean tls) {
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Bundle namePort = new Bundle();
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namePort.putString("name", name);
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namePort.putBoolean("tls", tls);
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namePort.putInt("port", port);
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return namePort;
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}
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private static Bundle createNamePortBundle(String name, int port, Map<String, List<String>> ips, final boolean tls) {
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Bundle namePort = new Bundle();
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namePort.putString("name", name);
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namePort.putBoolean("tls", tls);
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namePort.putInt("port", port);
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if (ips!=null) {
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List<String> ip = ips.get(name);
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Collections.shuffle(ip, new Random());
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namePort.putString("ip", ip.get(0));
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}
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return namePort;
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}
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private static Bundle createNamePortBundle(String name, int port, Data data, final boolean tls) {
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Bundle namePort = new Bundle();
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namePort.putString("name", name);
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namePort.putBoolean("tls", tls);
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namePort.putInt("port", port);
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if (data instanceof A) {
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namePort.putString("ip", data.toString());
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} else if (data instanceof AAAA) {
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namePort.putString("ip","["+data.toString()+"]");
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}
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return namePort;
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}
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public static boolean isIp(final String server) {
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return server != null && (
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PATTERN_IPV4.matcher(server).matches()
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|| PATTERN_IPV6.matcher(server).matches()
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|| PATTERN_IPV6_6HEX4DEC.matcher(server).matches()
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|| PATTERN_IPV6_HEX4DECCOMPRESSED.matcher(server).matches()
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|| PATTERN_IPV6_HEXCOMPRESSED.matcher(server).matches());
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}
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}
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