[#SSL_custom_ext_parse_cb_ex]
= SSL_custom_ext_parse_cb_ex
:mrdocs:

Parse a received custom TLS extension (context‐aware form).

== Synopsis

Declared in `<openssl/ssl.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
typedef int(* SSL_custom_ext_parse_cb_ex)(xref:SSL.adoc[SSL]*, unsigned int, unsigned int, unsigned char const*, size_t, xref:X509.adoc[X509]*, size_t, int*, void*);
----

== Return Value

1 if the extension is acceptable; 0 or negative to abort with `al.`

== Parameters

[cols="1,4"]
|===
| Name| Description
| *s*
| SSL connection parsing the message.
| *ext_type*
| TLS extension type being parsed.
| *context*
| Bitmask identifying the message and conditions for this call.
| *in*
| Extension payload bytes (temporary; invalid after return).
| *inlen*
| Length of `in` in bytes.
| *x*
| Current certificate when parsing a Certificate message, else NULL.
| *chainidx*
| Index of `x` in the Certificate message (0 = end entity).
| *al*
| On fatal error, set to the TLS alert to send.
| *parse_arg*
| Application argument registered with the extension.
|===


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