DobbyRdkPluginUtils.h

/*
* If not stated otherwise in this file or this component's LICENSE file the
* following copyright and licenses apply:
*
* Copyright 2020 Sky UK
*
* Licensed 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.
*/
/*
 * File:   DobbyRdkPluginUtils.h
 *
 */
#ifndef DOBBYRDKPLUGINUTILS_H
#define DOBBYRDKPLUGINUTILS_H
 
#include "rt_dobby_schema.h"
#include "rt_state_schema.h"
 
#if defined (DOBBY_BUILD)
    #include <IDobbyStartState.h>
#else
    #include <Dobby/rdkPlugins/IDobbyStartState.h>
#endif
 
#include <sys/types.h>
#include <string>
#include <fstream>
#include <functional>
#include <memory>
#include <list>
#include <mutex>
#include <arpa/inet.h>
#include <vector>
 
 
// TODO:: This would be better stored in the dobby workspace dir rather than /tmp,
// but we don't programatically know the workspace dir in this code.
#define ADDRESS_FILE_DIR          "/tmp/dobby/plugin/networking/"
 
#define MOUNT_TUNNEL_CONTAINER_PATH  "/mnt/.containermnttunnel"
#define MOUNT_TUNNEL_HOST_PATH       "/tmp/.hostmnttunnel"
 
typedef struct ContainerNetworkInfo
{
    std::string vethName;
    std::string ipAddress;
    in_addr_t ipAddressRaw;
    std::string containerId;
 
    bool operator==(const ContainerNetworkInfo &rhs) const
    {
        if (containerId.empty() || rhs.containerId.empty())
        {
            return ipAddressRaw == rhs.ipAddressRaw;
        }
        return containerId == rhs.containerId;
    }
} ContainerNetworkInfo;
 
// -----------------------------------------------------------------------------
class DobbyRdkPluginUtils
{
public:
    DobbyRdkPluginUtils(const std::shared_ptr<rt_dobby_schema> &cfg,
                        const std::string &containerId);
    DobbyRdkPluginUtils(const std::shared_ptr<rt_dobby_schema> &cfg,
                        const std::shared_ptr<IDobbyStartState> &startState,
                        const std::string &containerId);
    DobbyRdkPluginUtils(const std::shared_ptr<rt_dobby_schema> &cfg,
                        const std::shared_ptr<const rt_state_schema> &state,
                        const std::string &containerId);
    DobbyRdkPluginUtils(const std::shared_ptr<rt_dobby_schema> &cfg,
                        const std::shared_ptr<const rt_state_schema> &state,
                        const std::shared_ptr<IDobbyStartState> &startState,
                        const std::string &containerId);
    ~DobbyRdkPluginUtils();
 
    // -------------------------------------------------------------------------
    template< class Function, class... Args >
    inline bool callInNamespace(pid_t pid, int nsType, Function&& f, Args&&... args) const
    {
        return this->callInNamespaceImpl(pid, nsType, std::bind(std::forward<Function>(f),
                                                                std::forward<Args>(args)...));
    }
 
    bool callInNamespaceImpl(pid_t pid, int nsType,
                             const std::function<bool()>& func) const;
 
    void nsThread(int newNsFd, int nsType, bool* success,
                  std::function<bool()>& func) const;
 
 
    pid_t getContainerPid() const;
    std::string getContainerId() const;
    bool getContainerNetworkInfo(ContainerNetworkInfo &networkInfo);
    bool getTakenVeths(std::vector<std::string> &takenVeths);
 
    bool writeTextFile(const std::string &path,
                       const std::string &str,
                       int flags,
                       mode_t mode) const;
 
    std::string readTextFile(const std::string &path) const;
 
    bool addMount(const std::string &source,
                  const std::string &target,
                  const std::string &fsType,
                  const std::list<std::string> &mountOptions) const;
 
    static bool mkdirRecursive(const std::string& path, mode_t mode);
 
    bool addEnvironmentVar(const std::string& envVar) const;
 
    int addFileDescriptor(const std::string& pluginName, int fd);
 
    std::list<int> files() const;
 
    std::list<int> files(const std::string& pluginName) const;
 
    int exitStatus;
 
private:
    std::string ipAddressToString(const in_addr_t &ipAddress);
 
private:
    mutable std::mutex mLock;
 
    std::shared_ptr<rt_dobby_schema> mConf;
    std::shared_ptr<const rt_state_schema> mState;
    std::shared_ptr<IDobbyStartState> mStartState;
 
    const std::string mContainerId;
};
 
#endif // !defined(DOBBYRDKPLUGINUTILS_H)