kernel-netlink: Add a compile-time hook to simulate request message loss

src/libhydra/plugins/kernel_netlink/kernel_netlink_shared.c

@@ -77,6 +77,16 @@ struct private_netlink_socket_t {
 	u_int retries;
 };
 
+/**
+ * #definable hook to simulate request message loss
+ */
+#ifdef NETLINK_MSG_LOSS_HOOK
+bool NETLINK_MSG_LOSS_HOOK(struct nlmsghdr *msg);
+#define msg_loss_hook(msg) NETLINK_MSG_LOSS_HOOK(msg)
+#else
+#define msg_loss_hook(msg) FALSE
+#endif
+
 /**
  * Request entry the answer for a waiting thread is collected in
  */
@@ -109,6 +119,11 @@ static bool write_msg(private_netlink_socket_t *this, struct nlmsghdr *msg)
 	};
 	int len;
 
+	if (msg_loss_hook(msg))
+	{
+		return TRUE;
+	}
+
 	while (TRUE)
 	{
 		len = sendto(this->socket, msg, msg->nlmsg_len, 0,