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Diffstat (limited to 'src/main/java/eu/siacs/conversations/utils/DNSHelper.java')
-rw-r--r--src/main/java/eu/siacs/conversations/utils/DNSHelper.java235
1 files changed, 58 insertions, 177 deletions
diff --git a/src/main/java/eu/siacs/conversations/utils/DNSHelper.java b/src/main/java/eu/siacs/conversations/utils/DNSHelper.java
index ac64cf2e..26a7e195 100644
--- a/src/main/java/eu/siacs/conversations/utils/DNSHelper.java
+++ b/src/main/java/eu/siacs/conversations/utils/DNSHelper.java
@@ -7,21 +7,14 @@ 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.Random;
-import java.util.TreeMap;
-import java.util.Map;
+import java.util.TreeSet;
import java.util.regex.Pattern;
import de.measite.minidns.Client;
@@ -29,55 +22,60 @@ 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.thedevstack.android.logcat.Logging;
+import de.thedevstack.conversationsplus.ConversationsPlusApplication;
+import de.thedevstack.conversationsplus.dto.SrvRecord;
import eu.siacs.conversations.Config;
import eu.siacs.conversations.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");
+ private static final String CLIENT_SRV_PREFIX = "_xmpp-client._tcp.";
+ private static final String SECURE_CLIENT_SRV_PREFIX = "_xmpps-client._tcp.";
+ private 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");
+ private 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");
+ private 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");
+ private 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");
+ private 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;
+ static {
+ client.setTimeout(Config.SOCKET_TIMEOUT * 1000);
}
- b = queryDNS(host, server);
- if (b.containsKey("values")) {
- return b;
+
+ /**
+ * Queries the SRV record for the server JID.
+ * This method uses all available Domain Name Servers.
+ * @param jid the server JID
+ * @return TreeSet with SrvRecords. If no SRV record is found for JID an empty TreeSet is returned.
+ */
+ public static final TreeSet<SrvRecord> querySrvRecord(Jid jid) {
+ String host = jid.getDomainpart();
+ TreeSet<SrvRecord> result = new TreeSet<>();
+
+ final List<InetAddress> dnsServers = Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP ? getDnsServers() : getDnsServersPreLollipop();
+
+ if (dnsServers != null) {
+ for (InetAddress dnsServer : dnsServers) {
+ result = querySrvRecord(host, dnsServer);
+ if (!result.isEmpty()) {
+ break;
}
}
- 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;
+
+ return result;
}
@TargetApi(21)
- private static List<InetAddress> getDnsServers(Context context) {
+ private static List<InetAddress> getDnsServers() {
List<InetAddress> servers = new ArrayList<>();
- ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
+ ConnectivityManager connectivityManager = (ConnectivityManager) ConversationsPlusApplication.getInstance().getSystemService(Context.CONNECTIVITY_SERVICE);
Network[] networks = connectivityManager == null ? null : connectivityManager.getAllNetworks();
if (networks == null) {
return getDnsServersPreLollipop();
@@ -93,7 +91,7 @@ public class DNSHelper {
}
}
if (servers.size() > 0) {
- Log.d(Config.LOGTAG, "used lollipop variant to discover dns servers in " + networks.length + " networks");
+ Logging.d("dns", "used lollipop variant to discover dns servers in " + networks.length + " networks");
}
return servers.size() > 0 ? servers : getDnsServersPreLollipop();
}
@@ -133,154 +131,37 @@ public class DNSHelper {
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;
- }
+ /**
+ * Queries the SRV record for an host from the given Domain Name Server.
+ * @param host the host to query for
+ * @param dnsServerAddress the DNS to query on
+ * @return TreeSet with SrvRecords.
+ */
+ private static final TreeSet<SrvRecord> querySrvRecord(String host, InetAddress dnsServerAddress) {
+ TreeSet<SrvRecord> result = new TreeSet<>();
+ querySrvRecord(host, dnsServerAddress, false, result);
+ querySrvRecord(host, dnsServerAddress, true, result);
+ return result;
}
- 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() }) {
+ private static final void querySrvRecord(String host, InetAddress dnsServerAddress, boolean tlsSrvRecord, TreeSet<SrvRecord> result) {
+ String qname = (tlsSrvRecord ? SECURE_CLIENT_SRV_PREFIX : CLIENT_SRV_PREFIX) + host;
+ String dnsServerHostAddress = dnsServerAddress.getHostAddress();
+ Logging.d("dns", "using dns server: " + dnsServerHostAddress + " to look up " + qname);
+ try {
+ DNSMessage message = client.query(qname, TYPE.SRV, CLASS.IN, dnsServerHostAddress);
+ Record[] rrset = message.getAnswers();
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());
+ SrvRecord srvRecord = new SrvRecord(srv.getPriority(), srv.getName(), srv.getPort(), tlsSrvRecord);
+ result.add(srvRecord);
}
}
- 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()+"]");
+ } catch (IOException e) {
+ Logging.d("dns", "Error while retrieving SRV record '" + qname + "' for '" + host + "' from DNS '" + dnsServerHostAddress + "': " + e.getMessage());
}
- return namePort;
}
public static boolean isIp(final String server) {
generated by cgit v1.2.3 (git 2.25.1) at 2024-05-15 19:51:19 +0000