Implement curl_copy_handle in terms of object cloning (#19841)

This prevents the implementations from going out of sync, causing bugs like #19813.

Author: TimWolla

ext/curl/interface.c

@@ -1544,37 +1544,23 @@ static inline zend_result build_mime_structure_from_hash(php_curl *ch, zval *zpo
 /* {{{ Copy a cURL handle along with all of it's preferences */
 PHP_FUNCTION(curl_copy_handle)
 {
-php_curl*ch;
-CURL*cp;
 zval*zid;
-php_curl*dupch;
-zval*postfields;
 
 ZEND_PARSE_PARAMETERS_START(1,1)
 Z_PARAM_OBJECT_OF_CLASS(zid, curl_ce)
 ZEND_PARSE_PARAMETERS_END();
 
-ch = Z_CURL_P(zid);
-
-cp = curl_easy_duphandle(ch->cp);
-if (!cp) {
+zend_object *new_object = Z_OBJ_P(zid)->handlers->clone_obj(Z_OBJ_P(zid));
+if (EG(exception)) {
+if (new_object != NULL) {
+OBJ_RELEASE(new_object);
+}
+zend_clear_exception();
 php_error_docref(NULL, E_WARNING, "Cannot duplicate cURL handle");
 RETURN_FALSE;
 }
 
-dupch = init_curl_handle_into_zval(return_value);
-dupch->cp = cp;
-
-_php_setup_easy_copy_handlers(dupch, ch);
-
-postfields = &ch->postfields;
-if (Z_TYPE_P(postfields) != IS_UNDEF) {
-if (build_mime_structure_from_hash(dupch, postfields) == FAILURE) {
-zval_ptr_dtor(return_value);
-php_error_docref(NULL, E_WARNING, "Cannot rebuild mime structure");
-RETURN_FALSE;
-}
-}
+RETURN_OBJ(new_object);
 }
 /* }}} */