+YAZ_EXPORT void *cs_get_ssl(COMSTACK cs);
+YAZ_EXPORT int cs_set_ssl_ctx(COMSTACK cs, void *ctx);
+YAZ_EXPORT int cs_set_ssl_certificate_file(COMSTACK cs, const char *fname);
+YAZ_EXPORT int cs_get_peer_certificate_x509(COMSTACK cs, char **buf, int *len);