Support ip for hosts

catvod/src/main/java/com/github/catvod/net/OkDns.java

@@ -6,12 +6,14 @@ import java.net.InetAddress;
 import java.net.UnknownHostException;
 import java.util.HashMap;
 import java.util.List;
+import java.util.regex.Pattern;
 
 import okhttp3.Dns;
 import okhttp3.dnsoverhttps.DnsOverHttps;
 
 public class OkDns implements Dns {
 
+    private final Pattern IP = Pattern.compile("\\b(?:(?:[0-9]{1,3}\\.){3}[0-9]{1,3}|[0-9a-fA-F:]{2,39})\\b");
     private final HashMap<String, String> map;
     private DnsOverHttps doh;
 
@@ -31,10 +33,19 @@ public class OkDns implements Dns {
         }
     }
 
+    private boolean isAddress(String input) {
+        try {
+            return IP.matcher(input).find();
+        } catch (Exception e) {
+            return false;
+        }
+    }
+
     @NonNull
     @Override
     public List<InetAddress> lookup(@NonNull String hostname) throws UnknownHostException {
-        return (doh != null ? doh : Dns.SYSTEM).lookup(map.containsKey(hostname) ? map.get(hostname) : hostname);
+        String target = map.containsKey(hostname) ? map.get(hostname) : hostname;
+        return isAddress(target) ? List.of(InetAddress.getByName(target)) : (doh != null ? doh : Dns.SYSTEM).lookup(target);
     }
 }