Callback that supplies the contents of a custom TLS extension being sent.
Declared in <openssl/ssl.h>
typedef int(* SSL_custom_ext_add_cb_ex)(SSL*, unsigned int, unsigned int, unsigned char const**, size_t*, X509*, size_t, int*, void*);1 to include the extension, 0 to omit it, or -1 to abort with *al.
| Name | Description |
|---|---|
| s | SSL connection constructing the extension. |
| ext_type | TLS extension type code. |
| context | Bitmask identifying the message and role (SSL_EXT_*). |
| out | Set to point at the extension payload bytes to send. |
| outlen | Receives the length of *out. |
| x | Certificate associated with this extension when relevant, or NULL. |
| chainidx | Index of x in the certificate chain when applicable. |
| al | Set to a TLS alert code on failure. |
| add_arg | User argument from SSL_CTX_add_custom_ext. |