[#SSL_CTX_set_client_hello_cb]
= SSL_CTX_set_client_hello_cb
:mrdocs:

Install a server callback invoked after each ClientHello is parsed.

== Synopsis

Declared in `<openssl/ssl.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void
SSL_CTX_set_client_hello_cb(
    xref:SSL_CTX.adoc[SSL_CTX]* c,
    xref:SSL_client_hello_cb_fn.adoc[SSL_client_hello_cb_fn] cb,
    void* arg);
----

== Parameters

[cols="1,4"]
|===
| Name| Description
| *c*
| Server SSL context that receives ClientHellos.
| *cb*
| Callback of type SSL_client_hello_cb_fn, or NULL to clear.
| *arg*
| Application pointer forwarded to `cb.`
|===


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