native DNS resolving using Netty on macOS fails

[aviramha]

In a Java project using Netty to resolve DNS on macOS with native netty resolving it tries to access
dns_configuration_copy
to fetch dns configuration, which retrieves it via system api, hence returning the local DNS.
I think the solution would be to hook that function.

Code example

package org.example;

import io.netty.bootstrap.Bootstrap;
import io.netty.channel.EventLoop;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.nio.NioDatagramChannel;
import io.netty.channel.socket.nio.NioSocketChannel;
import io.netty.handler.codec.dns.DefaultDnsOptEcsRecord;
import io.netty.handler.codec.dns.DnsRecord;
import io.netty.resolver.dns.DnsNameResolverBuilder;
import io.netty.util.internal.SocketUtils;
import io.netty.util.concurrent.Future;
import io.netty.resolver.dns.DnsNameResolver;
import io.netty.resolver.dns.DnsAddressResolverGroup;

import java.net.InetAddress;
import java.util.Collections;
import java.util.List;
import java.util.concurrent.TimeUnit;

public class Main {
    public static void main(String[] args)
    {
        System.out.println("Hello, World!");
        EventLoopGroup group = new NioEventLoopGroup(1);
        DnsNameResolver resolver = new DnsNameResolverBuilder(group.next())
                .channelType(NioDatagramChannel.class).build();
        Future<List<InetAddress>> caca = resolver.resolveAll("mongo-mongodb.default.svc.cluster.local");
        for (InetAddress address: caca.syncUninterruptibly().getNow()) {
            System.out.println(address);
        }
        resolver.close();
        group.shutdownGracefully(0, 0, TimeUnit.SECONDS);
    }
}

[aviramha]

Related
rust-lang/libc#3667