From 9b981ab38b114d92eb806a50b94248e62af3fffa Mon Sep 17 00:00:00 2001
From: Christian Schneppe <christian@pix-art.de>
Date: Sun, 13 Aug 2017 22:11:14 +0200
Subject: provide extra 'network is unreachable' account state

---
 .../java/de/pixart/messenger/utils/Resolver.java   | 31 +++++++++++++++++++++-
 1 file changed, 30 insertions(+), 1 deletion(-)

(limited to 'src/main/java/de/pixart/messenger/utils/Resolver.java')

diff --git a/src/main/java/de/pixart/messenger/utils/Resolver.java b/src/main/java/de/pixart/messenger/utils/Resolver.java
index 0dc5bd0ac..83875b3eb 100644
--- a/src/main/java/de/pixart/messenger/utils/Resolver.java
+++ b/src/main/java/de/pixart/messenger/utils/Resolver.java
@@ -9,6 +9,7 @@ import java.net.Inet4Address;
 import java.net.InetAddress;
 import java.util.ArrayList;
 import java.util.Collections;
+import java.util.HashSet;
 import java.util.List;
 
 import de.measite.minidns.DNSClient;
@@ -23,6 +24,7 @@ import de.measite.minidns.record.CNAME;
 import de.measite.minidns.record.Data;
 import de.measite.minidns.record.InternetAddressRR;
 import de.measite.minidns.record.SRV;
+import de.measite.minidns.util.MultipleIoException;
 import de.pixart.messenger.Config;
 import de.pixart.messenger.R;
 import de.pixart.messenger.services.XmppConnectionService;
@@ -32,6 +34,8 @@ public class Resolver {
     private static final String DIRECT_TLS_SERVICE = "_xmpps-client";
     private static final String STARTTLS_SERICE = "_xmpp-client";
 
+    private static final String NETWORK_IS_UNREACHABLE = "Network is unreachable";
+
     private static XmppConnectionService SERVICE = null;
 
     public static void registerXmppConnectionService(XmppConnectionService service) {
@@ -43,19 +47,28 @@ public class Resolver {
         DNSClient.addDnsServerLookupMechanism(new AndroidUsingLinkProperties(context));
     }
 
-    public static List<Result> resolve(String domain) {
+    public static List<Result> resolve(String domain) throws NetworkIsUnreachableException {
         List<Result> results = new ArrayList<>();
+        HashSet<String> messages = new HashSet<>();
+
         try {
             results.addAll(resolveSrv(domain, true));
+        } catch (MultipleIoException e) {
+            messages.addAll(extractMessages(e));
         } catch (Throwable throwable) {
             Log.d(Config.LOGTAG, Resolver.class.getSimpleName() + ": error resolving SRV record (direct TLS)", throwable);
         }
         try {
             results.addAll(resolveSrv(domain, false));
+        } catch (MultipleIoException e) {
+            messages.addAll(extractMessages(e));
         } catch (Throwable throwable) {
             Log.d(Config.LOGTAG, Resolver.class.getSimpleName() + ": error resolving SRV record (STARTTLS)", throwable);
         }
         if (results.size() == 0) {
+            if (messages.size() == 1 && messages.contains(NETWORK_IS_UNREACHABLE)) {
+                throw new NetworkIsUnreachableException();
+            }
             results.addAll(resolveNoSrvRecords(DNSName.from(domain), true));
         }
         Collections.sort(results);
@@ -63,6 +76,18 @@ public class Resolver {
         return results;
     }
 
+    private static HashSet<String> extractMessages(MultipleIoException e) {
+        HashSet<String> messages = new HashSet<>();
+        for (Exception inner : e.getExceptions()) {
+            if (inner instanceof MultipleIoException) {
+                messages.addAll(extractMessages((MultipleIoException) inner));
+            } else {
+                messages.add(inner.getMessage());
+            }
+        }
+        return messages;
+    }
+
     private static List<Result> resolveSrv(String domain, final boolean directTls) throws IOException {
         if (Thread.currentThread().isInterrupted()) {
             return Collections.emptyList();
@@ -238,4 +263,8 @@ public class Resolver {
             return createDefault(hostname, null);
         }
     }
+
+    public static class NetworkIsUnreachableException extends Exception {
+
+    }
 }
\ No newline at end of file
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