typedef enum { ... } SilcSocketType;

    Socket types. These identifies the socket connection. There
    are four different types; unknown, client, server and router.
    Unknown connections are connections that hasn't advanced long
    enough so that we might know which type of connection it is.
    It is the applications responsibility to update the type
    information when it becomes available.

    typedef enum {
      SILC_SOCKET_TYPE_UNKNOWN = 0,
      SILC_SOCKET_TYPE_CLIENT = 1,
      SILC_SOCKET_TYPE_SERVER = 2,
      SILC_SOCKET_TYPE_ROUTER = 3
    } SilcSocketType;