SSL_CTRL_SET_MSG_CALLBACK_ARG
#define SSL_CTX_set_msg_callback_arg(ctx, arg) SSL_CTX_ctrl((ctx), SSL_CTRL_SET_MSG_CALLBACK_ARG, 0, (arg))
#define SSL_set_msg_callback_arg(ssl, arg) SSL_ctrl((ssl), SSL_CTRL_SET_MSG_CALLBACK_ARG, 0, (arg))
case SSL_CTRL_SET_MSG_CALLBACK_ARG:
case SSL_CTRL_SET_MSG_CALLBACK_ARG:
case SSL_CTRL_SET_MSG_CALLBACK_ARG: