weizhouapache commented on code in PR #8530: URL: https://github.com/apache/cloudstack/pull/8530#discussion_r1635956238
########## services/secondary-storage/server/src/main/java/org/apache/cloudstack/storage/resource/IpTablesHelper.java: ########## @@ -0,0 +1,66 @@ +// +// Licensed to the Apache Software Foundation (ASF) under one +// or more contributor license agreements. See the NOTICE file +// distributed with this work for additional information +// regarding copyright ownership. The ASF licenses this file +// to you under the Apache License, Version 2.0 (the +// "License"); you may not use this file except in compliance +// with the License. You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, +// software distributed under the License is distributed on an +// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY +// KIND, either express or implied. See the License for the +// specific language governing permissions and limitations +// under the License. +// + +package org.apache.cloudstack.storage.resource; + +import com.cloud.utils.script.Script; +import org.apache.log4j.Logger; + +public class IpTablesHelper { + public static final Logger LOGGER = Logger.getLogger(IpTablesHelper.class); + + public static final String OUTPUT_CHAIN = "OUTPUT"; + public static final String INPUT_CHAIN = "INPUT"; + public static final String INSERT = " -I "; + public static final String APPEND = " -A "; + + public static boolean needsAdding(String chain, String rule) { + Script command = new Script("/bin/bash", LOGGER); + command.add("-c"); + command.add("iptables -C " + chain + " " + rule); + + String commandOutput = command.execute(); + boolean needsAdding = (commandOutput != null && commandOutput.contains("iptables: Bad rule (does a matching rule exist in that chain?).")); + LOGGER.debug(String.format("Rule [%s], %s need adding to [%s] : %s", + rule, + needsAdding ? "does indeed" : "doesn't", + chain, + commandOutput + )); + return needsAdding; + } + + public static String addConditionally(String chain, boolean insert, String rule, String errMsg) { + LOGGER.info(String.format("Adding rule [%s] to [%s] if required.", rule, chain)); + if (needsAdding(chain, rule)) { + Script command = new Script("/bin/bash", LOGGER); + command.add("-c"); + command.add("iptables" + (insert ? INSERT : APPEND) + chain + " " + rule); + String result = command.execute(); + LOGGER.debug(String.format("Executed [%s] with result [%s]", command, result)); + if (result != null) { + LOGGER.warn(errMsg + result); + return errMsg + result; + } + } else { + LOGGER.warn("Rule already defined in SVM: " + rule); Review Comment: > I had the idea that this would/could be more generic code. Is it important? @DaanHoogland it is trivial. ignore it then -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: commits-unsubscr...@cloudstack.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org
