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fixed rare NPE in DnsHelper. fixed spelling and added logging

This commit is contained in:
Daniel Gultsch 2015-09-17 13:55:27 +02:00
parent b1b13ba0e5
commit 7e712d9d4c
1 changed files with 13 additions and 5 deletions
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16
src/main/java/eu/siacs/conversations/utils/DNSHelper.java
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@ -45,7 +45,7 @@ public class DNSHelper {
public static Bundle getSRVRecord(final Jid jid, Context context) throws IOException {
final String host = jid.getDomainpart();
final List<InetAddress> servers = Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP ? getDnsServers(context) : getDnsServersPreLolipop();
final List<InetAddress> servers = Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP ? getDnsServers(context) : getDnsServersPreLollipop();
Bundle b = null;
for(InetAddress server : servers) {
b = queryDNS(host, server);
@ -60,15 +60,23 @@ public class DNSHelper {
private static List<InetAddress> getDnsServers(Context context) {
List<InetAddress> servers = new ArrayList<>();
ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
Network[] networks = connectivityManager.getAllNetworks();
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) {
servers.addAll(linkProperties.getDnsServers());
}
return servers.size() > 0 ? servers : getDnsServersPreLolipop();
}
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> getDnsServersPreLolipop() {
private static List<InetAddress> getDnsServersPreLollipop() {
List<InetAddress> servers = new ArrayList<>();
String[] dns = client.findDNS();
for(int i = 0; i < dns.length; ++i) {