initial working version

internal/dnstt/capture_unsupported.go

@@ -0,0 +1,20 @@
+//go:build !linux
+
+package dnstt
+
+import "fmt"
+
+// OpenRawSocket is only implemented on Linux.
+func OpenRawSocket() (int, error) {
+	return -1, fmt.Errorf("raw packet capture is only supported on Linux")
+}
+
+// CaptureLoop is only implemented on Linux.
+func CaptureLoop(fd int, port int, collector *Collector, stop <-chan struct{}) {
+	<-stop
+}
+
+// CloseRawSocket is only implemented on Linux.
+func CloseRawSocket(fd int) error {
+	return nil
+}