Config service manager implementation.

Added new service for managing the service(RMCP+, ssh, web)
properties like state, port, channel etc. This is common
service supports both systemctl and iptables.

Example usage: Blocking specific service port and restricting
network traffic on specific channels etc.

Unit Test:
 - Changed port of RMCP+ service and validated.
 - Restricted network traffic on specific channel(eth0)
    and cross validated functionality.

Change-Id: I835a4723bc5d5a65efb6ec329f74f3932e841522
Signed-off-by: AppaRao Puli <apparao.puli@linux.intel.com>

9 files changed, 1040 insertions, 0 deletions

diff --git a/srvcfg-manager/.clang-format b/srvcfg-manager/.clang-format
new file mode 100644
index 0000000..37469de
--- /dev/null
+++ b/srvcfg-manager/.clang-format
@@ -0,0 +1,84 @@
+---
+Language:        Cpp
+# BasedOnStyle:  LLVM
+AccessModifierOffset: -2
+AlignAfterOpenBracket: Align
+AlignConsecutiveAssignments: false
+AlignConsecutiveDeclarations: false
+AlignEscapedNewlinesLeft: false
+AlignOperands:   true
+AlignTrailingComments: true
+AllowAllParametersOfDeclarationOnNextLine: true
+AllowShortBlocksOnASingleLine: false
+AllowShortCaseLabelsOnASingleLine: false
+AllowShortFunctionsOnASingleLine: None
+AllowShortIfStatementsOnASingleLine: false
+AllowShortLoopsOnASingleLine: false
+AlwaysBreakAfterDefinitionReturnType: None
+AlwaysBreakAfterReturnType: None
+AlwaysBreakBeforeMultilineStrings: false
+AlwaysBreakTemplateDeclarations: false
+BinPackArguments: true
+BinPackParameters: true
+BraceWrapping:
+  AfterClass:      true
+  AfterControlStatement: true
+  AfterEnum:       true
+  AfterFunction:   true
+  AfterNamespace:  true
+  AfterObjCDeclaration: true
+  AfterStruct:     true
+  AfterUnion:      true
+  BeforeCatch:     true
+  BeforeElse:      true
+  IndentBraces:    false
+BreakBeforeBinaryOperators: None
+BreakBeforeBraces: Custom
+BreakBeforeTernaryOperators: true
+BreakConstructorInitializers: AfterColon
+ColumnLimit:     80
+CommentPragmas:  '^ IWYU pragma:'
+ConstructorInitializerAllOnOneLineOrOnePerLine: false
+ConstructorInitializerIndentWidth: 4
+ContinuationIndentWidth: 4
+Cpp11BracedListStyle: true
+DerivePointerAlignment: true
+PointerAlignment: Left
+DisableFormat:   false
+ExperimentalAutoDetectBinPacking: false
+FixNamespaceComments: true
+ForEachMacros:   [ foreach, Q_FOREACH, BOOST_FOREACH ]
+IndentCaseLabels: true
+IndentWidth:     4
+IndentWrappedFunctionNames: true
+KeepEmptyLinesAtTheStartOfBlocks: true
+MacroBlockBegin: ''
+MacroBlockEnd:   ''
+MaxEmptyLinesToKeep: 1
+NamespaceIndentation: None
+ObjCBlockIndentWidth: 2
+ObjCSpaceAfterProperty: false
+ObjCSpaceBeforeProtocolList: true
+PenaltyBreakBeforeFirstCallParameter: 19
+PenaltyBreakComment: 300
+PenaltyBreakFirstLessLess: 120
+PenaltyBreakString: 1000
+PenaltyExcessCharacter: 1000000
+PenaltyReturnTypeOnItsOwnLine: 60
+PointerAlignment: Right
+ReflowComments:  true
+SortIncludes:    false
+SpaceAfterCStyleCast: false
+SpaceBeforeAssignmentOperators: true
+SpaceBeforeParens: ControlStatements
+SpaceInEmptyParentheses: false
+SpacesBeforeTrailingComments: 1
+SpacesInAngles:  false
+SpacesInContainerLiterals: true
+SpacesInCStyleCastParentheses: false
+SpacesInParentheses: false
+SpacesInSquareBrackets: false
+Standard:        Cpp11
+TabWidth:        4
+UseTab:          Never
+...
diff --git a/srvcfg-manager/CMakeLists.txt b/srvcfg-manager/CMakeLists.txt
new file mode 100644
index 0000000..6dd3e29
--- /dev/null
+++ b/srvcfg-manager/CMakeLists.txt
@@ -0,0 +1,58 @@
+cmake_minimum_required(VERSION 3.5 FATAL_ERROR)
+project(phosphor-srvcfg-manager CXX)
+set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-rtti")
+set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fno-rtti")
+
+set(CMAKE_INSTALL_RPATH_USE_LINK_PATH TRUE)
+
+include(GNUInstallDirs)
+include_directories(${CMAKE_CURRENT_SOURCE_DIR}/inc)
+find_package(Boost REQUIRED)
+include_directories(${Boost_INCLUDE_DIRS})
+add_definitions(-DBOOST_ERROR_CODE_HEADER_ONLY)
+add_definitions(-DBOOST_SYSTEM_NO_DEPRECATED)
+add_definitions(-DBOOST_ALL_NO_LIB)
+add_definitions(-DBOOST_NO_RTTI)
+add_definitions(-DBOOST_NO_TYPEID)
+add_definitions(-DBOOST_ASIO_DISABLE_THREADS)
+
+set(SRC_FILES src/main.cpp src/srvcfg_manager.cpp src/utils.cpp)
+
+# import libsystemd
+find_package(PkgConfig REQUIRED)
+pkg_check_modules(SYSTEMD libsystemd REQUIRED)
+include_directories(${SYSTEMD_INCLUDE_DIRS})
+link_directories(${SYSTEMD_LIBRARY_DIRS})
+
+# import sdbusplus
+find_package(PkgConfig REQUIRED)
+pkg_check_modules(SDBUSPLUSPLUS sdbusplus REQUIRED)
+include_directories(${SDBUSPLUSPLUS_INCLUDE_DIRS})
+link_directories(${SDBUSPLUSPLUS_LIBRARY_DIRS})
+find_program(SDBUSPLUSPLUS sdbus++)
+
+# phosphor-dbus-interfaces
+find_package(PkgConfig REQUIRED)
+pkg_check_modules(DBUSINTERFACE phosphor-dbus-interfaces REQUIRED)
+include_directories(${DBUSINTERFACE_INCLUDE_DIRS})
+link_directories(${DBUSINTERFACE_LIBRARY_DIRS})
+
+# import phosphor-logging
+find_package(PkgConfig REQUIRED)
+pkg_check_modules(LOGGING phosphor-logging REQUIRED)
+include_directories(${LOGGING_INCLUDE_DIRS})
+link_directories(${LOGGING_LIBRARY_DIRS})
+
+add_executable(${PROJECT_NAME} ${SRC_FILES})
+target_link_libraries(${PROJECT_NAME} systemd)
+target_link_libraries(${PROJECT_NAME} "${SDBUSPLUSPLUS_LIBRARIES} -lstdc++fs")
+target_link_libraries(${PROJECT_NAME} ${DBUSINTERFACE_LIBRARIES})
+target_link_libraries(${PROJECT_NAME} ${Boost_LIBRARIES})
+target_link_libraries(${PROJECT_NAME} phosphor_logging)
+
+set(SERVICE_FILES ${PROJECT_SOURCE_DIR}/srvcfg-manager.service)
+
+install(TARGETS ${PROJECT_NAME} DESTINATION sbin)
+install(FILES ${SERVICE_FILES} DESTINATION /lib/systemd/system/)
diff --git a/srvcfg-manager/LICENSE b/srvcfg-manager/LICENSE
new file mode 100644
index 0000000..8dada3e
--- /dev/null
+++ b/srvcfg-manager/LICENSE
@@ -0,0 +1,201 @@
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
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+   5. Submission of Contributions. Unless You explicitly state otherwise,
+      any Contribution intentionally submitted for inclusion in the Work
+      by You to the Licensor shall be under the terms and conditions of
+      this License, without any additional terms or conditions.
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+      the terms of any separate license agreement you may have executed
+      with Licensor regarding such Contributions.
+
+   6. Trademarks. This License does not grant permission to use the trade
+      names, trademarks, service marks, or product names of the Licensor,
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+
+   7. Disclaimer of Warranty. Unless required by applicable law or
+      agreed to in writing, Licensor provides the Work (and each
+      Contributor provides its Contributions) on an "AS IS" BASIS,
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+      whether in tort (including negligence), contract, or otherwise,
+      unless required by applicable law (such as deliberate and grossly
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+       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.
diff --git a/srvcfg-manager/inc/srvcfg_manager.hpp b/srvcfg-manager/inc/srvcfg_manager.hpp
new file mode 100644
index 0000000..8979f78
--- /dev/null
+++ b/srvcfg-manager/inc/srvcfg_manager.hpp
@@ -0,0 +1,69 @@
+/*

+// Copyright (c) 2018 Intel Corporation

+//

+// 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.

+*/

+#pragma once

+#include <sdbusplus/timer.hpp>

+#include "utils.hpp"

+

+namespace phosphor

+{

+namespace service

+{

+

+static constexpr const char *serviceConfigSrvName =

+    "xyz.openbmc_project.Control.Service.Manager";

+static constexpr const char *serviceConfigIntfName =

+    "xyz.openbmc_project.Control.Service.Attributes";

+

+enum class UpdatedProp

+{

+    port = 1,

+    channel,

+    state

+};

+

+class ServiceConfig

+{

+  public:

+    ServiceConfig(sdbusplus::asio::object_server &srv_,

+                  std::shared_ptr<sdbusplus::asio::connection> &conn_,

+                  std::string objPath_, std::string unitName);

+    ~ServiceConfig() = default;

+

+    void applySystemDServiceConfig();

+    void startServiceRestartTimer();

+

+    std::shared_ptr<sdbusplus::asio::connection> conn;

+    uint8_t updatedFlag;

+

+  private:

+    sdbusplus::asio::object_server &server;

+    std::string objPath;

+

+    uint16_t portNum;

+    std::string protocol;

+    std::string stateValue;

+    std::vector<std::string> channelList;

+

+    void registerProperties();

+    std::string sysDUnitName;

+    std::string unitSocketFilePath;

+    std::string sysDSockObjPath;

+

+    void syncWithSystemD1Properties();

+};

+

+} // namespace service

+} // namespace phosphor

diff --git a/srvcfg-manager/inc/utils.hpp b/srvcfg-manager/inc/utils.hpp
new file mode 100644
index 0000000..67ced4c
--- /dev/null
+++ b/srvcfg-manager/inc/utils.hpp
@@ -0,0 +1,40 @@
+/*

+// Copyright (c) 2018 Intel Corporation

+//

+// 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.

+*/

+#pragma once

+#include <ctime>

+#include <chrono>

+#include <string>

+#include <sdbusplus/asio/object_server.hpp>

+#include <phosphor-logging/elog-errors.hpp>

+#include <xyz/openbmc_project/Common/error.hpp>

+#include <experimental/filesystem>

+#include <boost/asio.hpp>

+

+static constexpr const char *sysdActionStartUnit = "StartUnit";

+static constexpr const char *sysdActionStopUnit = "StopUnit";

+

+void systemdDaemonReload(

+    const std::shared_ptr<sdbusplus::asio::connection> &conn);

+

+void systemdUnitAction(const std::shared_ptr<sdbusplus::asio::connection> &conn,

+                       const std::string &unitName,

+                       const std::string &actionMethod);

+

+void systemdUnitFileStateChange(

+    const std::shared_ptr<sdbusplus::asio::connection> &conn,

+    const std::string &unitName, const std::string &unitState);

+

+bool checkSystemdUnitExist(const std::string &unitName);

diff --git a/srvcfg-manager/src/main.cpp b/srvcfg-manager/src/main.cpp
new file mode 100644
index 0000000..ffb0e11
--- /dev/null
+++ b/srvcfg-manager/src/main.cpp
@@ -0,0 +1,45 @@
+/*

+// Copyright (c) 2018 Intel Corporation

+//

+// 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.

+*/

+#include "srvcfg_manager.hpp"

+

+std::shared_ptr<boost::asio::deadline_timer> timer = nullptr;

+std::map<std::string, std::shared_ptr<phosphor::service::ServiceConfig>>

+    srvMgrObjects;

+

+static std::map<std::string, std::string> serviceList = {

+    {"netipmid", "phosphor-ipmi-net"}, {"web", "bmcweb"}, {"ssh", "dropbear"}};

+

+int main()

+{

+    // setup connection to dbus

+    boost::asio::io_service io;

+    auto conn = std::make_shared<sdbusplus::asio::connection>(io);

+    timer = std::make_shared<boost::asio::deadline_timer>(io);

+    conn->request_name(phosphor::service::serviceConfigSrvName);

+    auto server = sdbusplus::asio::object_server(conn);

+    for (const auto &service : serviceList)

+    {

+        std::string objPath("/xyz/openbmc_project/control/service/" +

+                            service.first);

+        auto srvCfgObj = std::make_unique<phosphor::service::ServiceConfig>(

+            server, conn, objPath, service.second);

+        srvMgrObjects.emplace(

+            std::make_pair(std::move(service.first), std::move(srvCfgObj)));

+    }

+    io.run();

+

+    return 0;

+}

diff --git a/srvcfg-manager/src/srvcfg_manager.cpp b/srvcfg-manager/src/srvcfg_manager.cpp
new file mode 100644
index 0000000..04d41ca
--- /dev/null
+++ b/srvcfg-manager/src/srvcfg_manager.cpp
@@ -0,0 +1,387 @@
+/*

+// Copyright (c) 2018 Intel Corporation

+//

+// 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.

+*/

+#include <fstream>

+#include <regex>

+#include "srvcfg_manager.hpp"

+

+extern std::shared_ptr<boost::asio::deadline_timer> timer;

+extern std::map<std::string, std::shared_ptr<phosphor::service::ServiceConfig>>

+    srvMgrObjects;

+

+namespace phosphor

+{

+namespace service

+{

+

+static constexpr const char *overrideConfFileName = "override.conf";

+static constexpr const size_t restartTimeout = 15; // seconds

+

+static constexpr const char *systemd1UnitBasePath =

+    "/org/freedesktop/systemd1/unit/";

+static constexpr const char *systemdOverrideUnitBasePath =

+    "/etc/systemd/system/";

+

+void ServiceConfig::syncWithSystemD1Properties()

+{

+    // Read systemd1 socket/service property and load.

+    conn->async_method_call(

+        [this](boost::system::error_code ec,

+               const sdbusplus::message::variant<

+                   std::vector<std::tuple<std::string, std::string>>> &value) {

+            if (ec)

+            {

+                phosphor::logging::log<phosphor::logging::level::ERR>(

+                    "async_method_call error: Failed to get property");

+                return;

+            }

+

+            try

+            {

+                auto listenVal = sdbusplus::message::variant_ns::get<

+                    std::vector<std::tuple<std::string, std::string>>>(value);

+                protocol = std::get<0>(listenVal[0]);

+                std::string port = std::get<1>(listenVal[0]);

+                auto tmp = std::stoul(port.substr(port.find_last_of(":") + 1),

+                                      nullptr, 10);

+                if (tmp > std::numeric_limits<uint16_t>::max())

+                {

+                    throw std::out_of_range("Out of range");

+                }

+                portNum = tmp;

+            }

+            catch (const std::exception &e)

+            {

+                phosphor::logging::log<phosphor::logging::level::ERR>(

+                    "Exception for port number",

+                    phosphor::logging::entry("WHAT=%s", e.what()));

+                return;

+            }

+            conn->async_method_call(

+                [](boost::system::error_code ec) {

+                    if (ec)

+                    {

+                        phosphor::logging::log<phosphor::logging::level::ERR>(

+                            "async_method_call error: Failed to set property");

+                        return;

+                    }

+                },

+                serviceConfigSrvName, objPath.c_str(),

+                "org.freedesktop.DBus.Properties", "Set", serviceConfigIntfName,

+                "Port", sdbusplus::message::variant<uint16_t>(portNum));

+        },

+        "org.freedesktop.systemd1", sysDSockObjPath.c_str(),

+        "org.freedesktop.DBus.Properties", "Get",

+        "org.freedesktop.systemd1.Socket", "Listen");

+

+    conn->async_method_call(

+        [this](boost::system::error_code ec,

+               const sdbusplus::message::variant<std::string> &pValue) {

+            if (ec)

+            {

+                phosphor::logging::log<phosphor::logging::level::ERR>(

+                    "async_method_call error: Failed to get property");

+                return;

+            }

+

+            channelList.clear();

+            std::istringstream stm(

+                sdbusplus::message::variant_ns::get<std::string>(pValue));

+            std::string token;

+            while (std::getline(stm, token, ','))

+            {

+                channelList.push_back(token);

+            }

+            conn->async_method_call(

+                [](boost::system::error_code ec) {

+                    if (ec)

+                    {

+                        phosphor::logging::log<phosphor::logging::level::ERR>(

+                            "async_method_call error: Failed to set property");

+                        return;

+                    }

+                },

+                serviceConfigSrvName, objPath.c_str(),

+                "org.freedesktop.DBus.Properties", "Set", serviceConfigIntfName,

+                "Channel",

+                sdbusplus::message::variant<std::vector<std::string>>(

+                    channelList));

+        },

+        "org.freedesktop.systemd1", sysDSockObjPath.c_str(),

+        "org.freedesktop.DBus.Properties", "Get",

+        "org.freedesktop.systemd1.Socket", "BindToDevice");

+

+    std::string srvUnitName(sysDUnitName);

+    if (srvUnitName == "dropbear")

+    {

+        srvUnitName.append("@");

+    }

+    srvUnitName.append(".service");

+    conn->async_method_call(

+        [this](boost::system::error_code ec, const std::string &pValue) {

+            if (ec)

+            {

+                phosphor::logging::log<phosphor::logging::level::ERR>(

+                    "async_method_call error: Failed to get property");

+                return;

+            }

+            stateValue = pValue;

+            conn->async_method_call(

+                [](boost::system::error_code ec) {

+                    if (ec)

+                    {

+                        phosphor::logging::log<phosphor::logging::level::ERR>(

+                            "async_method_call error: Failed to set property");

+                        return;

+                    }

+                },

+                serviceConfigSrvName, objPath.c_str(),

+                "org.freedesktop.DBus.Properties", "Set", serviceConfigIntfName,

+                "State", sdbusplus::message::variant<std::string>(stateValue));

+        },

+        "org.freedesktop.systemd1", "/org/freedesktop/systemd1",

+        "org.freedesktop.systemd1.Manager", "GetUnitFileState", srvUnitName);

+

+    return;

+}

+

+ServiceConfig::ServiceConfig(

+    sdbusplus::asio::object_server &srv_,

+    std::shared_ptr<sdbusplus::asio::connection> &conn_, std::string objPath_,

+    std::string unitName) :

+    server(srv_),

+    conn(conn_), objPath(objPath_), sysDUnitName(unitName)

+{

+    std::string socketUnitName(sysDUnitName + ".socket");

+    // .socket systemd service files are handled.

+    // Regular .service only files are ignored.

+    if (!checkSystemdUnitExist(socketUnitName))

+    {

+        phosphor::logging::log<phosphor::logging::level::ERR>(

+            "Unit doesn't exist.",

+            phosphor::logging::entry("UNITNAME=%s", socketUnitName.c_str()));

+        phosphor::logging::elog<

+            sdbusplus::xyz::openbmc_project::Common::Error::InternalFailure>();

+    }

+

+    /// Check override socket directory exist, if not create it.

+    std::experimental::filesystem::path ovrUnitFileDir(

+        systemdOverrideUnitBasePath);

+    ovrUnitFileDir += socketUnitName;

+    ovrUnitFileDir += ".d";

+    if (!std::experimental::filesystem::exists(ovrUnitFileDir))

+    {

+        if (!std::experimental::filesystem::create_directories(ovrUnitFileDir))

+        {

+            phosphor::logging::log<phosphor::logging::level::ERR>(

+                "Unable to create the directory.",

+                phosphor::logging::entry("DIR=%s", ovrUnitFileDir.c_str()));

+            phosphor::logging::elog<sdbusplus::xyz::openbmc_project::Common::

+                                        Error::InternalFailure>();

+        }

+    }

+

+    /* Store require info locally */

+    unitSocketFilePath = std::string(ovrUnitFileDir);

+

+    sysDSockObjPath = systemd1UnitBasePath;

+    sysDSockObjPath.append(

+        std::regex_replace(sysDUnitName, std::regex("-"), "_2d"));

+    sysDSockObjPath.append("_2esocket");

+

+    // Adds interface, object and Properties....

+    registerProperties();

+

+    syncWithSystemD1Properties();

+

+    updatedFlag = 0;

+    return;

+}

+

+void ServiceConfig::applySystemDServiceConfig()

+{

+    phosphor::logging::log<phosphor::logging::level::INFO>(

+        "Applying new settings.",

+        phosphor::logging::entry("OBJPATH=%s", objPath.c_str()));

+    if (updatedFlag & ((1 << static_cast<uint8_t>(UpdatedProp::channel)) |

+                       (1 << static_cast<uint8_t>(UpdatedProp::port))))

+    {

+        // Create override config file and write data.

+        std::string ovrCfgFile{unitSocketFilePath + "/" + overrideConfFileName};

+        std::string tmpFile{ovrCfgFile + "_tmp"};

+        std::ofstream cfgFile(tmpFile, std::ios::out);

+        if (!cfgFile.good())

+        {

+            phosphor::logging::log<phosphor::logging::level::ERR>(

+                "Failed to open override.conf_tmp file");

+            phosphor::logging::elog<sdbusplus::xyz::openbmc_project::Common::

+                                        Error::InternalFailure>();

+        }

+

+        // Write the socket header

+        cfgFile << "[Socket]\n";

+        // Listen

+        cfgFile << "Listen" << protocol << "="

+                << "\n";

+        cfgFile << "Listen" << protocol << "=" << portNum << "\n";

+        // BindToDevice

+        bool firstElement = true;

+        cfgFile << "BindToDevice=";

+        for (const auto &it : channelList)

+        {

+            if (firstElement)

+            {

+                cfgFile << it;

+                firstElement = false;

+            }

+            else

+            {

+                cfgFile << "," << it;

+            }

+        }

+        cfgFile.close();

+

+        if (std::rename(tmpFile.c_str(), ovrCfgFile.c_str()) != 0)

+        {

+            phosphor::logging::log<phosphor::logging::level::ERR>(

+                "Failed to rename tmp file as override.conf");

+            std::remove(tmpFile.c_str());

+            phosphor::logging::elog<sdbusplus::xyz::openbmc_project::Common::

+                                        Error::InternalFailure>();

+        }

+

+        // Systemd forcing explicit socket stop before reload...!

+        std::string socketUnitName(sysDUnitName + ".socket");

+        systemdUnitAction(conn, socketUnitName, sysdActionStopUnit);

+

+        std::string srvUnitName(sysDUnitName + ".service");

+        systemdUnitAction(conn, srvUnitName, sysdActionStopUnit);

+

+        // Perform daemon reload to read new settings

+        systemdDaemonReload(conn);

+

+        // Restart the unit

+        systemdUnitAction(conn, socketUnitName, sysdActionStartUnit);

+        systemdUnitAction(conn, srvUnitName, sysdActionStartUnit);

+    }

+

+    if (updatedFlag & (1 << static_cast<uint8_t>(UpdatedProp::state)))

+    {

+        if ((stateValue == "enabled") || (stateValue == "disabled"))

+        {

+            systemdUnitFileStateChange(conn, sysDUnitName, stateValue);

+        }

+    }

+

+    // Reset the flag

+    updatedFlag = 0;

+

+    // All done. Lets reload the properties which are applied on systemd1.

+    // TODO: We need to capture the service restart signal and reload data

+    // inside the signal handler. So that we can update the service properties

+    // modified, outside of this service as well.

+    syncWithSystemD1Properties();

+

+    return;

+}

+

+void ServiceConfig::startServiceRestartTimer()

+{

+    timer->expires_from_now(boost::posix_time::seconds(restartTimeout));

+    timer->async_wait([this](const boost::system::error_code &ec) {

+        if (ec == boost::asio::error::operation_aborted)

+        {

+            // Timer reset.

+            return;

+        }

+        else if (ec)

+        {

+            phosphor::logging::log<phosphor::logging::level::ERR>(

+                "async wait error.");

+            return;

+        }

+        for (auto &srvMgrObj : srvMgrObjects)

+        {

+            auto &srvObj = srvMgrObj.second;

+            if (srvObj->updatedFlag)

+            {

+                srvObj->applySystemDServiceConfig();

+            }

+        }

+    });

+}

+

+void ServiceConfig::registerProperties()

+{

+    std::shared_ptr<sdbusplus::asio::dbus_interface> iface =

+        server.add_interface(objPath, serviceConfigIntfName);

+

+    iface->register_property(

+        "Port", portNum, [this](const uint16_t &req, uint16_t &res) {

+            phosphor::logging::log<phosphor::logging::level::ERR>(

+                " Inside register_property");

+            if (req == res)

+            {

+                return 1;

+            }

+            portNum = req;

+            updatedFlag |= (1 << static_cast<uint8_t>(UpdatedProp::port));

+            startServiceRestartTimer();

+            res = req;

+            return 1;

+        });

+

+    iface->register_property(

+        "Channel", channelList,

+        [this](const std::vector<std::string> &req,

+               std::vector<std::string> &res) {

+            if (req == res)

+            {

+                return 1;

+            }

+            channelList.clear();

+            std::copy(req.begin(), req.end(), back_inserter(channelList));

+

+            updatedFlag |= (1 << static_cast<uint8_t>(UpdatedProp::channel));

+            startServiceRestartTimer();

+            res = req;

+            return 1;

+        });

+

+    iface->register_property(

+        "State", stateValue, [this](const std::string &req, std::string &res) {

+            if (req == res)

+            {

+                return 1;

+            }

+            if ((req != "enabled") && (req != "disabled") && (req != "static"))

+            {

+                phosphor::logging::log<phosphor::logging::level::ERR>(

+                    "Invalid value specified");

+                return -EINVAL;

+            }

+            stateValue = req;

+            updatedFlag |= (1 << static_cast<uint8_t>(UpdatedProp::state));

+            startServiceRestartTimer();

+            res = req;

+            return 1;

+        });

+

+    iface->initialize();

+    return;

+}

+

+} // namespace service

+} // namespace phosphor

diff --git a/srvcfg-manager/src/utils.cpp b/srvcfg-manager/src/utils.cpp
new file mode 100644
index 0000000..07239e2
--- /dev/null
+++ b/srvcfg-manager/src/utils.cpp
@@ -0,0 +1,143 @@
+/*

+// Copyright (c) 2018 Intel Corporation

+//

+// 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.

+*/

+#include "utils.hpp"

+

+void systemdDaemonReload(

+    const std::shared_ptr<sdbusplus::asio::connection> &conn)

+{

+    try

+    {

+        conn->async_method_call(

+            [](boost::system::error_code ec) {

+                if (ec)

+                {

+                    phosphor::logging::log<phosphor::logging::level::ERR>(

+                        "async error: Failed to do systemd reload.");

+                    return;

+                }

+            },

+            "org.freedesktop.systemd1", "/org/freedesktop/systemd1",

+            "org.freedesktop.systemd1.Manager", "Reload");

+    }

+    catch (const sdbusplus::exception::SdBusError &e)

+    {

+        phosphor::logging::log<phosphor::logging::level::ERR>(

+            "daemon-reload operation failed.");

+        phosphor::logging::elog<

+            sdbusplus::xyz::openbmc_project::Common::Error::InternalFailure>();

+    }

+

+    return;

+}

+

+void systemdUnitAction(const std::shared_ptr<sdbusplus::asio::connection> &conn,

+                       const std::string &unitName,

+                       const std::string &actionMethod)

+{

+    try

+    {

+        conn->async_method_call(

+            [](boost::system::error_code ec,

+               const sdbusplus::message::object_path &res) {

+                if (ec)

+                {

+                    phosphor::logging::log<phosphor::logging::level::ERR>(

+                        "async error: Failed to do systemd action");

+                    return;

+                }

+            },

+            "org.freedesktop.systemd1", "/org/freedesktop/systemd1",

+            "org.freedesktop.systemd1.Manager", actionMethod, unitName,

+            "replace");

+    }

+    catch (const sdbusplus::exception::SdBusError &e)

+    {

+        phosphor::logging::log<phosphor::logging::level::ERR>(

+            "Systemd operation failed.",

+            phosphor::logging::entry("ACTION=%s", actionMethod.c_str()));

+        phosphor::logging::elog<

+            sdbusplus::xyz::openbmc_project::Common::Error::InternalFailure>();

+    }

+

+    return;

+}

+

+void systemdUnitFileStateChange(

+    const std::shared_ptr<sdbusplus::asio::connection> &conn,

+    const std::string &unitName, const std::string &unitState)

+{

+    try

+    {

+        // For now, we support two states(enabled & disabled). we can extend

+        // to other states (enable-runtime, mask, link etc..) if needed.

+        std::vector<std::string> unitFiles = {unitName};

+        if (unitState == "enabled")

+        {

+            conn->async_method_call(

+                [](boost::system::error_code ec) {

+                    if (ec)

+                    {

+                        phosphor::logging::log<phosphor::logging::level::ERR>(

+                            "async error: Failed to do systemd reload.");

+                        return;

+                    }

+                },

+                "org.freedesktop.systemd1", "/org/freedesktop/systemd1",

+                "org.freedesktop.systemd1.Manager", "EnableUnitFiles",

+                unitFiles, false, false);

+        }

+        else if (unitState == "disabled")

+        {

+            conn->async_method_call(

+                [](boost::system::error_code ec) {

+                    if (ec)

+                    {

+                        phosphor::logging::log<phosphor::logging::level::ERR>(

+                            "async error: Failed to do systemd reload.");

+                        return;

+                    }

+                },

+                "org.freedesktop.systemd1", "/org/freedesktop/systemd1",

+                "org.freedesktop.systemd1.Manager", "DisableUnitFiles",

+                unitFiles, false);

+        }

+        else

+        {

+            // Not supported unit State

+            phosphor::logging::log<phosphor::logging::level::ERR>(

+                "invalid Unit state",

+                phosphor::logging::entry("STATE=%s", unitState.c_str()));

+            phosphor::logging::elog<sdbusplus::xyz::openbmc_project::Common::

+                                        Error::InternalFailure>();

+        }

+    }

+    catch (const sdbusplus::exception::SdBusError &e)

+    {

+        phosphor::logging::log<phosphor::logging::level::ERR>(

+            "Systemd state change operation failed.");

+        phosphor::logging::elog<

+            sdbusplus::xyz::openbmc_project::Common::Error::InternalFailure>();

+    }

+

+    return;

+}

+

+bool checkSystemdUnitExist(const std::string &unitName)

+{

+    std::experimental::filesystem::path unitFilePath(

+        std::string("/lib/systemd/system/") + unitName);

+    return std::experimental::filesystem::exists(unitFilePath);

+}

diff --git a/srvcfg-manager/srvcfg-manager.service b/srvcfg-manager/srvcfg-manager.service
new file mode 100644
index 0000000..288b5f4
--- /dev/null
+++ b/srvcfg-manager/srvcfg-manager.service
@@ -0,0 +1,13 @@
+[Unit]
+Description=Daemon to control service configuration
+
+[Service]
+Restart=always
+ExecStart={sbindir}/phosphor-srvcfg-manager
+RestartSec=5
+StartLimitInterval=0
+Type=dbus
+BusName=xyz.openbmc_project.Control.Service.Manager
+
+[Install]
+WantedBy=basic.target