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>
diff --git a/src/utils.cpp b/src/utils.cpp
new file mode 100644
index 0000000..07239e2
--- /dev/null
+++ b/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);

+}