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Diffstat (limited to 'src/main/java/de/pixart/messenger/utils/DNSHelper.java')
-rw-r--r--src/main/java/de/pixart/messenger/utils/DNSHelper.java294
1 files changed, 294 insertions, 0 deletions
diff --git a/src/main/java/de/pixart/messenger/utils/DNSHelper.java b/src/main/java/de/pixart/messenger/utils/DNSHelper.java
new file mode 100644
index 000000000..c6bfbf930
--- /dev/null
+++ b/src/main/java/de/pixart/messenger/utils/DNSHelper.java
@@ -0,0 +1,294 @@
+package de.pixart.messenger.utils;
+
+import android.annotation.TargetApi;
+import android.content.Context;
+import android.net.ConnectivityManager;
+import android.net.LinkProperties;
+import android.net.Network;
+import android.net.RouteInfo;
+import android.os.Build;
+import android.os.Bundle;
+import android.os.Parcelable;
+import android.util.Log;
+
+import java.io.IOException;
+import java.net.Inet4Address;
+import java.net.InetAddress;
+import java.net.SocketTimeoutException;
+import java.net.UnknownHostException;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import java.util.Map;
+import java.util.Random;
+import java.util.TreeMap;
+import java.util.regex.Pattern;
+
+import de.measite.minidns.Client;
+import de.measite.minidns.DNSMessage;
+import de.measite.minidns.Record;
+import de.measite.minidns.Record.CLASS;
+import de.measite.minidns.Record.TYPE;
+import de.measite.minidns.record.A;
+import de.measite.minidns.record.AAAA;
+import de.measite.minidns.record.Data;
+import de.measite.minidns.record.SRV;
+import de.measite.minidns.util.NameUtil;
+import de.pixart.messenger.Config;
+import de.pixart.messenger.xmpp.jid.Jid;
+
+public class DNSHelper {
+
+ 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");
+ 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");
+ 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");
+ 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");
+ public static final Pattern PATTERN_IPV6 = Pattern.compile("\\A(?:[0-9a-fA-F]{1,4}:){7}[0-9a-fA-F]{1,4}\\z");
+
+ protected static Client client = new Client();
+
+ protected static Context context;
+
+ public static Bundle getSRVRecord(final Jid jid, Context context) throws IOException {
+ DNSHelper.context = context;
+ final String host = jid.getDomainpart();
+ final List<InetAddress> servers = Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP ? getDnsServers(context) : getDnsServersPreLollipop();
+ Bundle b = new Bundle();
+ boolean interrupted = false;
+ for(InetAddress server : servers) {
+ if (Thread.currentThread().isInterrupted()) {
+ interrupted = true;
+ break;
+ }
+ b = queryDNS(host, server);
+ if (b.containsKey("values")) {
+ return b;
+ }
+ }
+ if (!b.containsKey("values")) {
+ Log.d(Config.LOGTAG,(interrupted ? "Thread interrupted during DNS query" :"all dns queries failed") + ". provide fallback A record");
+ ArrayList<Parcelable> values = new ArrayList<>();
+ values.add(createNamePortBundle(host, 5222, false));
+ b.putParcelableArrayList("values",values);
+ }
+ return b;
+ }
+
+ @TargetApi(21)
+ private static List<InetAddress> getDnsServers(Context context) {
+ List<InetAddress> servers = new ArrayList<>();
+ ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
+ Network[] networks = connectivityManager == null ? null : connectivityManager.getAllNetworks();
+ if (networks == null) {
+ return getDnsServersPreLollipop();
+ }
+ for(int i = 0; i < networks.length; ++i) {
+ LinkProperties linkProperties = connectivityManager.getLinkProperties(networks[i]);
+ if (linkProperties != null) {
+ if (hasDefaultRoute(linkProperties)) {
+ servers.addAll(0, getIPv4First(linkProperties.getDnsServers()));
+ } else {
+ servers.addAll(getIPv4First(linkProperties.getDnsServers()));
+ }
+ }
+ }
+ if (servers.size() > 0) {
+ Log.d(Config.LOGTAG, "used lollipop variant to discover dns servers in " + networks.length + " networks");
+ }
+ return servers.size() > 0 ? servers : getDnsServersPreLollipop();
+ }
+
+ private static List<InetAddress> getIPv4First(List<InetAddress> in) {
+ List<InetAddress> out = new ArrayList<>();
+ for(InetAddress addr : in) {
+ if (addr instanceof Inet4Address) {
+ out.add(0, addr);
+ } else {
+ out.add(addr);
+ }
+ }
+ return out;
+ }
+
+ @TargetApi(Build.VERSION_CODES.LOLLIPOP)
+ private static boolean hasDefaultRoute(LinkProperties linkProperties) {
+ for(RouteInfo route: linkProperties.getRoutes()) {
+ if (route.isDefaultRoute()) {
+ return true;
+ }
+ }
+ return false;
+ }
+
+ private static List<InetAddress> getDnsServersPreLollipop() {
+ List<InetAddress> servers = new ArrayList<>();
+ String[] dns = client.findDNS();
+ for(int i = 0; i < dns.length; ++i) {
+ try {
+ servers.add(InetAddress.getByName(dns[i]));
+ } catch (UnknownHostException e) {
+ //ignore
+ }
+ }
+ return servers;
+ }
+
+ private static class TlsSrv {
+ private final SRV srv;
+ private final boolean tls;
+
+ public TlsSrv(SRV srv, boolean tls) {
+ this.srv = srv;
+ this.tls = tls;
+ }
+ }
+
+ 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 {
+ final DNSMessage message = client.query(qname, TYPE.SRV, CLASS.IN, dnsServer.getHostAddress());
+ for (Record[] rrset : new Record[][] { message.getAnswers(), message.getAdditionalResourceRecords() }) {
+ for (Record rr : rrset) {
+ Data d = rr.getPayload();
+ if (d instanceof SRV && NameUtil.idnEquals(qname, rr.getName())) {
+ SRV srv = (SRV) d;
+ if (!priorities.containsKey(srv.getPriority())) {
+ priorities.put(srv.getPriority(),new ArrayList<TlsSrv>());
+ }
+ priorities.get(srv.getPriority()).add(new TlsSrv(srv, tls));
+ }
+ if (d instanceof A) {
+ A a = (A) d;
+ if (!ips4.containsKey(rr.getName())) {
+ ips4.put(rr.getName(), new ArrayList<String>());
+ }
+ ips4.get(rr.getName()).add(a.toString());
+ }
+ if (d instanceof AAAA) {
+ AAAA aaaa = (AAAA) d;
+ if (!ips6.containsKey(rr.getName())) {
+ ips6.put(rr.getName(), new ArrayList<String>());
+ }
+ ips6.get(rr.getName()).add("[" + aaaa.toString() + "]");
+ }
+ }
+ }
+ }
+
+ public static Bundle queryDNS(String host, InetAddress dnsServer) {
+ Bundle bundle = new Bundle();
+ try {
+ client.setTimeout(Config.SOCKET_TIMEOUT * 1000);
+ final String qname = "_xmpp-client._tcp." + host;
+ final String tlsQname = "_xmpps-client._tcp." + host;
+ Log.d(Config.LOGTAG, "using dns server: " + dnsServer.getHostAddress() + " to look up " + host);
+
+ final Map<Integer, List<TlsSrv>> priorities = new TreeMap<>();
+ final Map<String, List<String>> ips4 = new TreeMap<>();
+ final Map<String, List<String>> ips6 = new TreeMap<>();
+
+ fillSrvMaps(qname, dnsServer, priorities, ips4, ips6, false);
+ fillSrvMaps(tlsQname, dnsServer, priorities, ips4, ips6, true);
+
+ final List<TlsSrv> result = new ArrayList<>();
+ for (final List<TlsSrv> s : priorities.values()) {
+ result.addAll(s);
+ }
+
+ final ArrayList<Bundle> values = new ArrayList<>();
+ if (result.size() == 0) {
+ DNSMessage response;
+ try {
+ response = client.query(host, TYPE.A, CLASS.IN, dnsServer.getHostAddress());
+ for (int i = 0; i < response.getAnswers().length; ++i) {
+ values.add(createNamePortBundle(host, 5222, response.getAnswers()[i].getPayload(), false));
+ }
+ } catch (SocketTimeoutException e) {
+ Log.d(Config.LOGTAG,"ignoring timeout exception when querying A record on "+dnsServer.getHostAddress());
+ }
+ try {
+ response = client.query(host, TYPE.AAAA, CLASS.IN, dnsServer.getHostAddress());
+ for (int i = 0; i < response.getAnswers().length; ++i) {
+ values.add(createNamePortBundle(host, 5222, response.getAnswers()[i].getPayload(), false));
+ }
+ } catch (SocketTimeoutException e) {
+ Log.d(Config.LOGTAG,"ignoring timeout exception when querying AAAA record on "+dnsServer.getHostAddress());
+ }
+ values.add(createNamePortBundle(host, 5222, false));
+ bundle.putParcelableArrayList("values", values);
+ return bundle;
+ }
+ for (final TlsSrv tlsSrv : result) {
+ final SRV srv = tlsSrv.srv;
+ if (ips6.containsKey(srv.getName())) {
+ values.add(createNamePortBundle(srv.getName(),srv.getPort(),ips6, tlsSrv.tls));
+ } else {
+ try {
+ DNSMessage response = client.query(srv.getName(), TYPE.AAAA, CLASS.IN, dnsServer.getHostAddress());
+ for (int i = 0; i < response.getAnswers().length; ++i) {
+ values.add(createNamePortBundle(srv.getName(), srv.getPort(), response.getAnswers()[i].getPayload(), tlsSrv.tls));
+ }
+ } catch (SocketTimeoutException e) {
+ Log.d(Config.LOGTAG,"ignoring timeout exception when querying AAAA record on "+dnsServer.getHostAddress());
+ }
+ }
+ if (ips4.containsKey(srv.getName())) {
+ values.add(createNamePortBundle(srv.getName(),srv.getPort(),ips4, tlsSrv.tls));
+ } else {
+ DNSMessage response = client.query(srv.getName(), TYPE.A, CLASS.IN, dnsServer.getHostAddress());
+ for(int i = 0; i < response.getAnswers().length; ++i) {
+ values.add(createNamePortBundle(srv.getName(),srv.getPort(),response.getAnswers()[i].getPayload(), tlsSrv.tls));
+ }
+ }
+ values.add(createNamePortBundle(srv.getName(), srv.getPort(), tlsSrv.tls));
+ }
+ bundle.putParcelableArrayList("values", values);
+ } catch (SocketTimeoutException e) {
+ bundle.putString("error", "timeout");
+ } catch (Exception e) {
+ bundle.putString("error", "unhandled");
+ }
+ return bundle;
+ }
+
+ private static Bundle createNamePortBundle(String name, int port, final boolean tls) {
+ Bundle namePort = new Bundle();
+ namePort.putString("name", name);
+ namePort.putBoolean("tls", tls);
+ namePort.putInt("port", port);
+ return namePort;
+ }
+
+ private static Bundle createNamePortBundle(String name, int port, Map<String, List<String>> ips, final boolean tls) {
+ Bundle namePort = new Bundle();
+ namePort.putString("name", name);
+ namePort.putBoolean("tls", tls);
+ namePort.putInt("port", port);
+ if (ips!=null) {
+ List<String> ip = ips.get(name);
+ Collections.shuffle(ip, new Random());
+ namePort.putString("ip", ip.get(0));
+ }
+ return namePort;
+ }
+
+ private static Bundle createNamePortBundle(String name, int port, Data data, final boolean tls) {
+ Bundle namePort = new Bundle();
+ namePort.putString("name", name);
+ namePort.putBoolean("tls", tls);
+ namePort.putInt("port", port);
+ if (data instanceof A) {
+ namePort.putString("ip", data.toString());
+ } else if (data instanceof AAAA) {
+ namePort.putString("ip","["+data.toString()+"]");
+ }
+ return namePort;
+ }
+
+ public static boolean isIp(final String server) {
+ return server != null && (
+ PATTERN_IPV4.matcher(server).matches()
+ || PATTERN_IPV6.matcher(server).matches()
+ || PATTERN_IPV6_6HEX4DEC.matcher(server).matches()
+ || PATTERN_IPV6_HEX4DECCOMPRESSED.matcher(server).matches()
+ || PATTERN_IPV6_HEXCOMPRESSED.matcher(server).matches());
+ }
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-07-28 15:56:41 +0000