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-rw-r--r--src/main/java/de/thedevstack/conversationsplus/utils/DNSHelper.java221
1 files changed, 71 insertions, 150 deletions
diff --git a/src/main/java/de/thedevstack/conversationsplus/utils/DNSHelper.java b/src/main/java/de/thedevstack/conversationsplus/utils/DNSHelper.java
index aa16b06b..9481572d 100644
--- a/src/main/java/de/thedevstack/conversationsplus/utils/DNSHelper.java
+++ b/src/main/java/de/thedevstack/conversationsplus/utils/DNSHelper.java
@@ -6,170 +6,91 @@ import de.measite.minidns.Record;
import de.measite.minidns.Record.TYPE;
import de.measite.minidns.Record.CLASS;
import de.measite.minidns.record.SRV;
-import de.measite.minidns.record.A;
-import de.measite.minidns.record.AAAA;
import de.measite.minidns.record.Data;
import de.measite.minidns.util.NameUtil;
import java.io.IOException;
import java.net.InetAddress;
-import java.net.SocketTimeoutException;
-import java.util.ArrayList;
-import java.util.Collections;
-import java.util.Random;
-import java.util.TreeMap;
+import java.util.TreeSet;
import java.util.regex.Pattern;
-import android.os.Bundle;
-
import de.thedevstack.android.logcat.Logging;
-import de.thedevstack.conversationsplus.Config;
+import de.thedevstack.conversationsplus.dto.SrvRecord;
import de.thedevstack.conversationsplus.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 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();
- public static Bundle getSRVRecord(final Jid jid) throws IOException {
- final String host = jid.getDomainpart();
- String dns[] = client.findDNS();
-
- if (dns != null) {
- for (String dnsserver : dns) {
- InetAddress ip = InetAddress.getByName(dnsserver);
- Bundle b = queryDNS(host, ip);
- if (b.containsKey("values")) {
- return b;
- }
- }
- }
- return queryDNS(host, InetAddress.getByName("8.8.8.8"));
- }
-
- public static Bundle queryDNS(String host, InetAddress dnsServer) {
- Bundle bundle = new Bundle();
- try {
- String qname = "_xmpp-client._tcp." + host;
- Logging.d(Config.LOGTAG, "using dns server: " + dnsServer.getHostAddress() + " to look up " + host);
- DNSMessage message = client.query(qname, TYPE.SRV, CLASS.IN, dnsServer.getHostAddress());
-
- TreeMap<Integer, ArrayList<SRV>> priorities = new TreeMap<>();
- TreeMap<String, ArrayList<String>> ips4 = new TreeMap<>();
- TreeMap<String, ArrayList<String>> ips6 = new TreeMap<>();
-
- 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<SRV>());
- }
- priorities.get(srv.getPriority()).add(srv);
- }
- 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() + "]");
- }
- }
- }
-
- ArrayList<SRV> result = new ArrayList<>();
- for (ArrayList<SRV> s : priorities.values()) {
- result.addAll(s);
- }
-
- ArrayList<Bundle> values = new ArrayList<>();
- if (result.size() == 0) {
- DNSMessage response;
- 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()));
- }
- 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()));
- }
- values.add(createNamePortBundle(host,5222));
- bundle.putParcelableArrayList("values", values);
- return bundle;
- }
- for (SRV srv : result) {
- if (ips6.containsKey(srv.getName())) {
- values.add(createNamePortBundle(srv.getName(),srv.getPort(),ips6));
- } else {
- 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()));
- }
- }
- if (ips4.containsKey(srv.getName())) {
- values.add(createNamePortBundle(srv.getName(),srv.getPort(),ips4));
- } 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()));
- }
- }
- values.add(createNamePortBundle(srv.getName(), srv.getPort()));
- }
- bundle.putParcelableArrayList("values", values);
- } catch (SocketTimeoutException e) {
- bundle.putString("error", "timeout");
- } catch (Exception e) {
- e.printStackTrace();
- bundle.putString("error", "unhandled");
- }
- return bundle;
- }
-
- private static Bundle createNamePortBundle(String name, int port) {
- Bundle namePort = new Bundle();
- namePort.putString("name", name);
- namePort.putInt("port", port);
- return namePort;
- }
-
- private static Bundle createNamePortBundle(String name, int port, TreeMap<String, ArrayList<String>> ips) {
- Bundle namePort = new Bundle();
- namePort.putString("name", name);
- namePort.putInt("port", port);
- if (ips!=null) {
- ArrayList<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) {
- Bundle namePort = new Bundle();
- namePort.putString("name", name);
- 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;
- }
-
+ /**
+ * 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();
+ String dns[] = client.findDNS();
+ TreeSet<SrvRecord> result = new TreeSet<>();
+
+ if (dns != null) {
+ for (String dnsserver : dns) {
+ result = querySrvRecord(host, dnsserver);
+ if (!result.isEmpty()) {
+ break;
+ }
+ }
+ }
+
+ return result;
+ }
+
+ /**
+ * Queries the SRV record for an host from the given Domain Name Server.
+ * @param host the host to query for
+ * @param dnsserver the DNS to query on
+ * @return TreeSet with SrvRecords.
+ */
+ private static final TreeSet<SrvRecord> querySrvRecord(String host, String dnsserver) {
+ TreeSet<SrvRecord> result = new TreeSet<>();
+ try {
+ InetAddress dnsServerAddress = InetAddress.getByName(dnsserver);
+ String qname = CLIENT_SRV_PREFIX + host;
+ DNSMessage message = client.query(qname, TYPE.SRV, CLASS.IN, dnsServerAddress.getHostAddress());
+ 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;
+ SrvRecord srvRecord = new SrvRecord(srv.getPriority(), srv.getName(), srv.getPort());
+ result.add(srvRecord);
+ }
+ }
+ } catch (IOException e) {
+ Logging.d("dns", "Error while retrieving SRV record for '" + host + "' from DNS '" + dnsserver + "': " + e.getMessage());
+ }
+ return result;
+ }
+
+ /**
+ * Checks whether the given server is an IP address or not.
+ * The following patterns are treated as valid IP addresses:
+ * <ul>
+ * <li>{@link #PATTERN_IPV4}</li>
+ * <li>{@link #PATTERN_IPV6}</li>
+ * <li>{@link #PATTERN_IPV6_6HEX4DEC}</li>
+ * <li>{@link #PATTERN_IPV6_HEX4DECCOMPRESSED}</li>
+ * <li>{@link #PATTERN_IPV6_HEXCOMPRESSED}</li>
+ * </ul>
+ * @param server the string to check
+ * @return <code>true</code> if one of the patterns is matched <code>false</code> otherwise
+ */
public static boolean isIp(final String server) {
return PATTERN_IPV4.matcher(server).matches()
|| PATTERN_IPV6.matcher(server).matches()
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-20 18:05:50 +0000