Function s2n_quic::provider::tls::default::ffi::s2n_client_hello_get_session_id

pub unsafe extern "C" fn s2n_client_hello_get_session_id(
    ch: *mut s2n_client_hello,
    out: *mut u8,
    out_length: *mut u32,
    max_length: u32
) -> i32

Copies up to max_length bytes of the ClientHello session_id into the out buffer and stores the number of copied bytes in out_length.

Retrieve the session id as sent by the client in the ClientHello message. The session id on the s2n_connection may change later when the server sends the ServerHello; see s2n_connection_get_session_id for how to get the final session id used for future session resumption.

Use s2n_client_hello_get_session_id_length() to get the the ClientHello session id length in bytes. ch is a pointer to the s2n_client_hello of the s2n_connection which can be obtained using s2n_connection_get_client_hello().

@param ch A pointer to the Client Hello @param out A pointer to the buffer that s2n will write the client session id to. This buffer MUST be the size of max_length @param out_length An out pointer. s2n will set it’s value to the size of the session_id in bytes. @param max_length The size of out. @returns S2N_SUCCESS on success. S2N_FAILURE on failure