diff --git a/handler.hpp b/handler.hpp
new file mode 100644
index 0000000..cad2916
--- /dev/null
+++ b/handler.hpp
@@ -0,0 +1,37 @@
+#pragma once
+
+#include <cstdint>
+#include <string>
+#include <tuple>
+
+namespace google
+{
+namespace ipmi
+{
+
+class HandlerInterface
+{
+  public:
+    virtual ~HandlerInterface() = default;
+
+    /**
+     * Return ethernet details (hard-coded).
+     *
+     * @return tuple of ethernet details (channel, if name).
+     */
+    virtual std::tuple<std::uint8_t, std::string> getEthDetails() const = 0;
+};
+
+class Handler : public HandlerInterface
+{
+  public:
+    Handler() = default;
+    ~Handler() = default;
+
+    std::tuple<std::uint8_t, std::string> getEthDetails() const override;
+};
+
+extern Handler handlerImpl;
+
+} // namespace ipmi
+} // namespace google