[#SSL_client_hello_cb_fn]
= SSL_client_hello_cb_fn
:mrdocs:

Server callback invoked after a ClientHello is received and parsed.

== Synopsis

Declared in `<openssl/ssl.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
typedef int(* SSL_client_hello_cb_fn)(xref:SSL.adoc[SSL]*, int*, void*);
----

== Return Value

SSL_CLIENT_HELLO_SUCCESS, SSL_CLIENT_HELLO_ERROR, or SSL_CLIENT_HELLO_RETRY.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *s*
| Server SSL connection processing the ClientHello.
| *al*
| On failure, set to a TLS alert description to send.
| *arg*
| Application pointer from SSL_CTX_set_client_hello_cb().
|===


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