Fixed cannot reload RuleResolver when no rule is activated

Author: PeratX

app/src/main/java/org/itxtech/daedalus/Daedalus.java

@@ -140,7 +140,7 @@ public static <T> T parseJson(Class<T> beanClass, JsonReader reader) throws Json
         return gson.fromJson(reader, beanClass);
     }
 
-    public static void initHostsResolver() {
+    public static void initRuleResolver() {
         if (Daedalus.getPrefs().getBoolean("settings_local_rules_resolution", false)) {
             ArrayList<String> pendingLoad = new ArrayList<>();
             ArrayList<Rule> usingRules = configurations.getUsingRules();
@@ -161,6 +161,8 @@ public static void initHostsResolver() {
                             RuleResolver.startLoadDnsmasq(arr);
                             break;
                     }
+                } else {
+                    RuleResolver.clear();
                 }
             } else {
                 RuleResolver.clear();
@@ -171,7 +173,7 @@ public static void initHostsResolver() {
     public static void setRulesChanged() {
         if (DaedalusVpnService.isActivated() &&
                 getPrefs().getBoolean("settings_allow_dynamic_rule_reload", false)) {
-            initHostsResolver();
+            initRuleResolver();
         }
     }
 

app/src/main/java/org/itxtech/daedalus/service/DaedalusVpnService.java

@@ -111,7 +111,7 @@ public int onStartCommand(Intent intent, int flags, int startId) {
                         this.notification = builder;
                     }
 
-                    Daedalus.initHostsResolver();
+                    Daedalus.initRuleResolver();
                     DNSServerHelper.buildPortCache();
 
                     if (this.mThread == null) {

app/src/main/java/org/itxtech/daedalus/util/RuleResolver.java

@@ -33,8 +33,8 @@ public class RuleResolver implements Runnable {
     private static int mode = MODE_HOSTS;
     private static String[] hostsFiles;
     private static String[] dnsmasqFiles;
-    private static HashMap<String, String> rulesA;
-    private static HashMap<String, String> rulesAAAA;
+    private static HashMap<String, String> rulesA = new HashMap<>();
+    private static HashMap<String, String> rulesAAAA = new HashMap<>();
     private static boolean shutdown = false;
 
     public RuleResolver() {
@@ -61,18 +61,20 @@ public static void startLoadDnsmasq(String[] loadPath) {
     }
 
     public static void clear() {
-        rulesA = null;
-        rulesAAAA = null;
+        rulesA = new HashMap<>();
+        rulesAAAA = new HashMap<>();
     }
 
     public static String resolve(String hostname, Record.TYPE type) {
-        HashMap<String, String> rules = null;
+        HashMap<String, String> rules;
         if (type == Record.TYPE.A) {
             rules = rulesA;
         } else if (type == Record.TYPE.AAAA) {
             rules = rulesAAAA;
+        } else {
+            return null;
         }
-        if (rules == null) {
+        if (rules.size() == 0) {
             return null;
         }
         if (rules.containsKey(hostname)) {