NPN server callback that advertises the server's protocol list.
Declared in <openssl/ssl.h>
typedef int(* SSL_CTX_npn_advertised_cb_func)(SSL*, unsigned char const**, unsigned int*, void*);SSL_TLSEXT_ERR_OK to send the list, or another SSL_TLSEXT_ERR_* code.
| Name | Description |
|---|---|
| ssl | Server SSL connection performing NPN. |
| out | Set to the wire-format protocol list to advertise. |
| outlen | Receives the length of *out. |
| arg | User argument from SSL_CTX_set_next_protos_advertised_cb. |