SilcNetListener
    silc_net_tcp_create_listener(const char **local_ip_addr,
                                 SilcUInt32 local_ip_count, int port,
                                 SilcBool lookup, SilcBool require_fqdn,
                                 SilcSchedule schedule,
                                 SilcNetCallback callback, void *context);

    This function creates TCP listener.  This is used to create network
    listener for incoming connections, and `callback' will be called
    everytime new connection is received.  If `local_ip_addr' is NULL 'any'
    address is used.  If provided it can be used bind the listener to
    `local_ip_count' many IP addresses provided in `local_ip_addr' table.
    On success returns the SilcNetListener context, or NULL on error.
    If `require_fqdn' is TRUE the listener will require that the incoming
    connection has FQDN to be able to connect.  If the `lookup' is TRUE
    then the incoming connection hostname will be resolved.  If the `port'
    is zero (0), operating system will define it automatically.

    The `callback' always delivers valid new stream.  It is not called
    with an error status.