- if (ctx && !SSL_CTX_add_server_custom_ext(ctx, ext_type,
- serverinfo_srv_add_cb,
- NULL, NULL,
- serverinfo_srv_parse_cb,
- NULL))
- return 0;
+ if (ctx) {
+ int have_ext_cbs = 0;
+ size_t i;
+ custom_ext_methods *exts = &ctx->cert->srv_ext;
+ custom_ext_method *meth = exts->meths;
+
+ /* check for existing callbacks for this extension */
+ for (i = 0; i < exts->meths_count; i++, meth++) {
+ if (ext_type == meth->ext_type) {
+ have_ext_cbs = 1;
+ break;
+ }
+ }
+
+ if (!have_ext_cbs && !SSL_CTX_add_server_custom_ext(ctx, ext_type,
+ serverinfo_srv_add_cb,
+ NULL, NULL,
+ serverinfo_srv_parse_cb,
+ NULL))
+ return 0;
+ }