diff options
Diffstat (limited to 'src/main/java/eu/siacs/conversations/utils/DNSHelper.java')
-rw-r--r-- | src/main/java/eu/siacs/conversations/utils/DNSHelper.java | 294 |
1 files changed, 0 insertions, 294 deletions
diff --git a/src/main/java/eu/siacs/conversations/utils/DNSHelper.java b/src/main/java/eu/siacs/conversations/utils/DNSHelper.java deleted file mode 100644 index b51a9f16a..000000000 --- a/src/main/java/eu/siacs/conversations/utils/DNSHelper.java +++ /dev/null @@ -1,294 +0,0 @@ -package eu.siacs.conversations.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 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"); - - 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()); - } -} |