Refactoring louloulibs and cmake

Use OBJECT libraries
Remove the louloulibs directory
Write FOUND variables in the cache

src/network/dns_handler.hpp

@@ -0,0 +1,37 @@
+#pragma once
+
+#include <biboumi.h>
+#ifdef UDNS_FOUND
+
+class Poller;
+
+#include <network/dns_socket_handler.hpp>
+
+#include <string>
+#include <vector>
+#include <memory>
+
+class DNSHandler
+{
+public:
+  explicit DNSHandler(std::shared_ptr<Poller>& poller);
+  ~DNSHandler() = default;
+
+  DNSHandler(const DNSHandler&) = delete;
+  DNSHandler(DNSHandler&&) = delete;
+  DNSHandler& operator=(const DNSHandler&) = delete;
+  DNSHandler& operator=(DNSHandler&&) = delete;
+
+  void destroy();
+
+  static void watch();
+  static void unwatch();
+
+private:
+  /**
+   * Manager for the socket returned by udns, that we need to watch with the poller
+   */
+  static std::unique_ptr<DNSSocketHandler> socket_handler;
+};
+
+#endif /* UDNS_FOUND */