3.6.4 HeartBeat

This is a TLS extension that allows to ping and receive confirmation from the peer, and is described in [RFC6520]. The extension is disabled by default and gnutls_heartbeat_enable can be used to enable it. A policy may be negotiated to only allow sending heartbeat messages or sending and receiving. The current session policy can be checked with gnutls_heartbeat_allowed. The requests coming from the peer result to GNUTLS_E_HEARTBEAT_PING_RECEIVED being returned from the receive function. Ping requests to peer can be send via gnutls_heartbeat_ping.

unsigned gnutls_heartbeat_allowed (gnutls_session_t session, unsigned int type)

void gnutls_heartbeat_enable (gnutls_session_t session, unsigned int type)

int gnutls_heartbeat_ping (gnutls_session_t session, size_t data_size, unsigned int max_tries, unsigned int flags)

int gnutls_heartbeat_pong (gnutls_session_t session, unsigned int flags)

void gnutls_heartbeat_set_timeouts (gnutls_session_t session, unsigned int retrans_timeout, unsigned int total_timeout)

unsigned int gnutls_heartbeat_get_timeout (gnutls_session_t session)