Improved the management of soap request/response.

The director has the opportunity to change the configuration of AC in join
connection. The virtual interfaces which encapsulate the wifi stations is
managed dynamically by the Director.
The AC must request authorization from Director for associate a station.

src/ac/ac_soap.c

@@ -721,6 +721,44 @@ struct ac_soap_response* ac_soapclient_recv_response(struct ac_http_soap_request
 	return response;
 }
 
+/* */
+struct json_object* ac_soapclient_parse_json_response(struct ac_soap_response* response) {
+	int length;
+	char* json;
+	xmlChar* xmlResult;
+	struct json_object* jsonroot;
+
+	ASSERT(response != NULL);
+
+	/* */
+	if ((response->responsecode != HTTP_RESULT_OK) || !response->xmlResponseReturn) {
+		return NULL;
+	}
+
+	/* Decode base64 result */
+	xmlResult = xmlNodeGetContent(response->xmlResponseReturn);
+	if (!xmlResult) {
+		return NULL;
+	}
+
+	length = xmlStrlen(xmlResult);
+	if (!length) {
+		xmlFree(xmlResult);
+		return NULL;
+	}
+
+	json = (char*)capwap_alloc(AC_BASE64_DECODE_LENGTH(length));
+	ac_base64_string_decode((const char*)xmlResult, json);
+
+	xmlFree(xmlResult);
+
+	/* Parsing JSON result */
+	jsonroot = json_tokener_parse(json);
+	capwap_free(json);
+
+	return jsonroot;
+}
+
 /* */
 void ac_soapclient_free_response(struct ac_soap_response* response) {
 	ASSERT(response != NULL);