Query related to SSL_CTX_set_msg_callback_arg

[Viktor Dukhovni]

On Mon, Jun 10, 2019 at 07:16:26AM +0000, shalu dhamija via openssl-users wrote:

>  Actually while setting the callback, we can not pass the user-defined/application data.

You can however attach it to the SSL connection handle as "ex_data":

    https://github.com/vdukhovni/postfix/blob/master/postfix/src/tls/tls_misc.c#L300-L304
    https://github.com/vdukhovni/postfix/blob/master/postfix/src/tls/tls_server.c#L395-L406
    https://github.com/vdukhovni/postfix/blob/master/postfix/src/tls/tls_server.c#L812-L817

and retrieve it from the SSL handle as needed:

    https://github.com/vdukhovni/postfix/blob/master/postfix/src/tls/tls_server.c#L265

-- 
	Viktor.