Add support for UDP routing in systemd socket activation

pkg/server/socket_activation.go

@@ -0,0 +1,41 @@
+package server
+
+import (
+	"errors"
+	"net"
+)
+
+type SocketActivation struct {
+	enabled   bool
+	listeners map[string]net.Listener
+	conns     map[string]net.PacketConn
+}
+
+func (s *SocketActivation) isEnabled() bool {
+	return s.enabled
+}
+
+func (s *SocketActivation) getListener(name string) (net.Listener, error) {
+	listener, ok := s.listeners[name]
+	if !ok {
+		return nil, errors.New("unable to find socket activation TCP listener for entryPoint")
+	}
+
+	return listener, nil
+}
+
+func (s *SocketActivation) getConn(name string) (net.PacketConn, error) {
+	conn, ok := s.conns[name]
+	if !ok {
+		return nil, errors.New("unable to find socket activation UDP listener for entryPoint")
+	}
+
+	return conn, nil
+}
+
+var socketActivation *SocketActivation
+
+func init() {
+	// Populates pre-defined TCP and UDP listeners provided by systemd socket activation.
+	socketActivation = populateSocketActivationListeners()
+}