aboutsummaryrefslogtreecommitdiffstats
path: root/src/main/java/de/thedevstack/conversationsplus/utils/DNSHelper.java
diff options
context:
space:
mode:
Diffstat (limited to 'src/main/java/de/thedevstack/conversationsplus/utils/DNSHelper.java')
-rw-r--r--src/main/java/de/thedevstack/conversationsplus/utils/DNSHelper.java139
1 files changed, 99 insertions, 40 deletions
diff --git a/src/main/java/de/thedevstack/conversationsplus/utils/DNSHelper.java b/src/main/java/de/thedevstack/conversationsplus/utils/DNSHelper.java
index 9481572d..90618292 100644
--- a/src/main/java/de/thedevstack/conversationsplus/utils/DNSHelper.java
+++ b/src/main/java/de/thedevstack/conversationsplus/utils/DNSHelper.java
@@ -1,33 +1,50 @@
package de.thedevstack.conversationsplus.utils;
-import de.measite.minidns.Client;
-import de.measite.minidns.DNSMessage;
-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.Data;
-import de.measite.minidns.util.NameUtil;
+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 java.io.IOException;
import java.net.InetAddress;
+import java.net.UnknownHostException;
+import java.util.ArrayList;
+import java.util.List;
import java.util.TreeSet;
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.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 de.thedevstack.conversationsplus.Config;
import de.thedevstack.conversationsplus.xmpp.jid.Jid;
public class DNSHelper {
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");
+ 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();
+ static {
+ client.setTimeout(Config.PING_TIMEOUT * 1000);
+ }
+
/**
* Queries the SRV record for the server JID.
* This method uses all available Domain Name Servers.
@@ -36,12 +53,13 @@ public class DNSHelper {
*/
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);
+ 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;
}
@@ -51,51 +69,92 @@ public class DNSHelper {
return result;
}
+ @TargetApi(21)
+ private static List<InetAddress> getDnsServers() {
+ List<InetAddress> servers = new ArrayList<>();
+ ConnectivityManager connectivityManager = (ConnectivityManager) ConversationsPlusApplication.getInstance().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, linkProperties.getDnsServers());
+ } else {
+ servers.addAll(linkProperties.getDnsServers());
+ }
+ }
+ }
+ if (servers.size() > 0) {
+ Logging.d("dns", "used lollipop variant to discover dns servers in " + networks.length + " networks");
+ }
+ return servers.size() > 0 ? servers : getDnsServersPreLollipop();
+ }
+
+ @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;
+ }
+
/**
* 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
+ * @param dnsServerAddress the DNS to query on
* @return TreeSet with SrvRecords.
*/
- private static final TreeSet<SrvRecord> querySrvRecord(String host, String dnsserver) {
+ 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 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 {
- InetAddress dnsServerAddress = InetAddress.getByName(dnsserver);
- String qname = CLIENT_SRV_PREFIX + host;
- DNSMessage message = client.query(qname, TYPE.SRV, CLASS.IN, dnsServerAddress.getHostAddress());
+ 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;
- SrvRecord srvRecord = new SrvRecord(srv.getPriority(), srv.getName(), srv.getPort());
+ SrvRecord srvRecord = new SrvRecord(srv.getPriority(), srv.getName(), srv.getPort(), tlsSrvRecord);
result.add(srvRecord);
}
}
} catch (IOException e) {
- Logging.d("dns", "Error while retrieving SRV record for '" + host + "' from DNS '" + dnsserver + "': " + e.getMessage());
+ Logging.d("dns", "Error while retrieving SRV record '" + qname + "' for '" + host + "' from DNS '" + dnsServerHostAddress + "': " + 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()
+ 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();
+ || PATTERN_IPV6_HEXCOMPRESSED.matcher(server).matches());
}
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-11 01:05:50 +0000