Initial version of Virtual-Media

This is initial version of virtual media support
this covers:
* udev monitoring
* configuration reading
* exposing appropriate interfaces on dbus
* allows mount/umount images from existing unix socket

Does not cover:
* configuration of usb gadget

Integration with bmcweb will be delivered to bmcweb

Change-Id: I358ab80fe32a7ed933007143bfa00da847a95316
Signed-off-by: Rapkiewicz, Pawel <pawel.rapkiewicz@intel.com>
Signed-off-by: Kowalski, Kamil <kamil.kowalski@intel.com>

7 files changed, 1275 insertions, 0 deletions

diff --git a/.clang-format b/.clang-format
new file mode 100644
index 0000000..ae9ad39
--- /dev/null
+++ b/.clang-format
@@ -0,0 +1,98 @@
+---
+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: true
+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: false
+PointerAlignment: Left
+DisableFormat:   false
+ExperimentalAutoDetectBinPacking: false
+FixNamespaceComments: true
+ForEachMacros:   [ foreach, Q_FOREACH, BOOST_FOREACH ]
+IncludeBlocks: Regroup
+IncludeCategories:
+  - Regex:           '^[<"](gtest|gmock)'
+    Priority:        5
+  - Regex:           '^"config.h"'
+    Priority:        -1
+  - Regex:           '^".*\.hpp"'
+    Priority:        1
+  - Regex:           '^<.*\.h>'
+    Priority:        2
+  - Regex:           '^<.*'
+    Priority:        3
+  - Regex:           '.*'
+    Priority:        4
+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
+ReflowComments:  true
+SortIncludes:    true
+SortUsingDeclarations: true
+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/CMakeLists.txt b/CMakeLists.txt
new file mode 100644
index 0000000..60af112
--- /dev/null
+++ b/CMakeLists.txt
@@ -0,0 +1,144 @@
+cmake_minimum_required(VERSION 3.5 FATAL_ERROR)
+
+project(VirtualMedia CXX)
+
+cmake_policy(SET CMP0054 NEW)
+
+set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
+set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+set(CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/cmake ${CMAKE_MODULE_PATH})
+
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -fno-rtti")
+set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -Os -flto")
+set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -O0")
+
+option(YOCTO_DEPENDENCIES "Use YOCTO dependencies system" OFF)
+
+option(VM_USE_VALGRIND "Build VirtualMedia to work with valgrind" OFF)
+
+if(NOT ${YOCTO_DEPENDENCIES})
+  include(ExternalProject)
+
+  externalproject_add(sdbusplus-project
+                      PREFIX
+                      ${CMAKE_BINARY_DIR}/sdbusplus-project
+                      GIT_REPOSITORY
+                      https://github.com/openbmc/sdbusplus.git
+                      GIT_TAG
+                      c08cf5283b80a071d19506d9a462f6c69e1797f1
+                      SOURCE_DIR
+                      ${CMAKE_BINARY_DIR}/sdbusplus-src
+                      BINARY_DIR
+                      ${CMAKE_BINARY_DIR}/sdbusplus-build
+                      CONFIGURE_COMMAND
+                      ""
+                      BUILD_COMMAND
+                      cd
+                      ${CMAKE_BINARY_DIR}/sdbusplus-src
+                      &&
+                      ./bootstrap.sh
+                      &&
+                      ./configure
+                      --enable-transaction
+                      &&
+                      make
+                      -j
+                      libsdbusplus.la
+                      INSTALL_COMMAND
+                      ""
+                      LOG_DOWNLOAD
+                      ON
+                      UPDATE_COMMAND
+                      "")
+
+  externalproject_add(nlohmann-json
+                      GIT_REPOSITORY
+                      "https://github.com/nlohmann/json.git"
+                      GIT_TAG
+                      aafad2be1f3cd259a1e79d2f6fcf267d1ede9ec7
+                      SOURCE_DIR
+                      "${CMAKE_BINARY_DIR}/nlohmann-json-src"
+                      BINARY_DIR
+                      "${CMAKE_BINARY_DIR}/nlohmann-json-build"
+                      CONFIGURE_COMMAND
+                      ""
+                      BUILD_COMMAND
+                      ""
+                      INSTALL_COMMAND
+                      mkdir
+                      -p
+                      "${CMAKE_BINARY_DIR}/prefix/include/nlohmann"
+                      &&
+                      cp
+                      -r
+                      "${CMAKE_BINARY_DIR}/nlohmann-json-src/include/nlohmann"
+                      "${CMAKE_BINARY_DIR}/prefix/include"
+                      UPDATE_COMMAND
+                      "")
+
+  include_directories(${CMAKE_BINARY_DIR}/prefix/include)
+  include_directories(${CMAKE_BINARY_DIR}/sdbusplus-src)
+
+  link_directories(${CMAKE_BINARY_DIR}/sdbusplus-src/.libs)
+
+endif()
+
+# Include UDEV library
+find_package(udev REQUIRED)
+include_directories(${UDEV_INCLUDE_DIRS})
+link_directories(${UDEV_LIBRARIES})
+
+# Include Boost library This allows specify exact version of BOOST to be used,
+# especially important while using valgrind, to point BOOST that is compiled
+# with valgrind support
+if(${BOOST_VERSION})
+  find_package(Boost ${BOOST_VERSION} EXACT)
+else()
+  find_package(Boost 1.69 REQUIRED)
+endif()
+message("++ Using Boost version: " ${Boost_VERSION})
+
+include_directories(${Boost_INCLUDE_DIRS})
+link_directories(${Boost_LIBRARY_DIRS})
+
+# Boost related definitions
+add_definitions(-DBOOST_COROUTINES_NO_DEPRECATION_WARNING)
+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)
+
+# Define source files
+set(SRC_FILES src/main.cpp)
+
+# Executables
+add_executable(virtual-media ${SRC_FILES} ${HEADER_FILES})
+if(NOT ${YOCTO_DEPENDENCIES})
+  add_dependencies(virtual-media nlohmann-json sdbusplus-project)
+endif()
+
+# Default linkage
+target_link_libraries(virtual-media systemd)
+target_link_libraries(virtual-media -lsdbusplus)
+target_link_libraries(virtual-media -ludev)
+target_link_libraries(virtual-media -lboost_coroutine)
+target_link_libraries(virtual-media -lboost_context)
+install(TARGETS virtual-media DESTINATION sbin)
+
+# Options based compile definitions
+target_compile_definitions(virtual-media
+                           PRIVATE
+                           $<$<BOOL:${VM_USE_VALGRIND}>:
+                           -DBOOST_USE_VALGRIND>
+                           $<$<BOOL:${CUSTOM_DBUS_PATH}>:
+                           -DCUSTOM_DBUS_PATH="${CUSTOM_DBUS_PATH}">)
+
+if(CMAKE_INSTALL_SYSCONFDIR)
+  install(FILES ${PROJECT_SOURCE_DIR}/virtual-media.json DESTINATION
+                ${CMAKE_INSTALL_SYSCONFDIR})
+endif()
+install(FILES ${PROJECT_SOURCE_DIR}/xyz.openbmc_project.VirtualMedia.service
+              DESTINATION /lib/systemd/system/)
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..8dada3e
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,201 @@
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+
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diff --git a/cmake/Findudev.cmake b/cmake/Findudev.cmake
new file mode 100644
index 0000000..ce454d5
--- /dev/null
+++ b/cmake/Findudev.cmake
@@ -0,0 +1,77 @@
+# - try to find the udev library
+#
+# Cache Variables: (probably not for direct use in your scripts)
+#  UDEV_INCLUDE_DIR
+#  UDEV_SOURCE_DIR
+#  UDEV_LIBRARY
+#
+# Non-cache variables you might use in your CMakeLists.txt:
+#  UDEV_FOUND
+#  UDEV_INCLUDE_DIRS
+#  UDEV_LIBRARIES
+#
+# Requires these CMake modules:
+#  FindPackageHandleStandardArgs (known included with CMake >=2.6.2)
+#
+# Original Author:
+# 2014 Kevin M. Godby <kevin@godby.org>
+#
+# Distributed under the Boost Software License, Version 1.0.
+# (See accompanying file LICENSE_1_0.txt or copy at
+# http://www.boost.org/LICENSE_1_0.txt)
+
+set(UDEV_ROOT_DIR
+    "${UDEV_ROOT_DIR}"
+	CACHE
+	PATH
+    "Directory to search for udev")
+
+find_package(PkgConfig QUIET)
+if(PKG_CONFIG_FOUND)
+	pkg_check_modules(PC_LIBUDEV libudev)
+endif()
+
+find_library(UDEV_LIBRARY
+	NAMES
+	udev
+	PATHS
+	${PC_LIBUDEV_LIBRARY_DIRS}
+	${PC_LIBUDEV_LIBDIR}
+	HINTS
+	"${UDEV_ROOT_DIR}"
+	PATH_SUFFIXES
+	lib
+	)
+
+get_filename_component(_libdir "${UDEV_LIBRARY}" PATH)
+
+find_path(UDEV_INCLUDE_DIR
+	NAMES
+	libudev.h
+	PATHS
+	${PC_LIBUDEV_INCLUDE_DIRS}
+	${PC_LIBUDEV_INCLUDEDIR}
+	HINTS
+	"${_libdir}"
+	"${_libdir}/.."
+	"${UDEV_ROOT_DIR}"
+	PATH_SUFFIXES
+	include
+	)
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(UDEV
+	DEFAULT_MSG
+	UDEV_LIBRARY
+	UDEV_INCLUDE_DIR
+	)
+
+if(UDEV_FOUND)
+	list(APPEND UDEV_LIBRARIES ${UDEV_LIBRARY})
+	list(APPEND UDEV_INCLUDE_DIRS ${UDEV_INCLUDE_DIR})
+	mark_as_advanced(UDEV_ROOT_DIR)
+endif()
+
+mark_as_advanced(UDEV_INCLUDE_DIR
+	UDEV_LIBRARY)
+
diff --git a/src/main.cpp b/src/main.cpp
new file mode 100644
index 0000000..3dfd0ad
--- /dev/null
+++ b/src/main.cpp
@@ -0,0 +1,722 @@
+#include <boost/asio.hpp>
+#include <boost/asio/buffer.hpp>
+#include <boost/asio/posix/stream_descriptor.hpp>
+#include <boost/asio/spawn.hpp>
+#include <boost/container/flat_map.hpp>
+#include <boost/container/flat_set.hpp>
+#include <boost/process.hpp>
+#include <filesystem>
+#include <iostream>
+#include <memory>
+#include <nlohmann/json.hpp>
+#include <sdbusplus/asio/connection.hpp>
+#include <sdbusplus/asio/object_server.hpp>
+
+namespace fs = std::filesystem;
+
+namespace udev
+{
+#include <libudev.h>
+struct udev;
+struct udev_monitor;
+struct udev_device;
+
+struct udevDeleter
+{
+    void operator()(udev* desc) const
+    {
+        udev_unref(desc);
+    }
+};
+
+struct monitorDeleter
+{
+    void operator()(udev_monitor* desc) const
+    {
+        udev_monitor_unref(desc);
+    };
+};
+
+struct deviceDeleter
+{
+    void operator()(udev_device* desc) const
+    {
+        udev_device_unref(desc);
+    };
+};
+} // namespace udev
+
+enum class StateChange
+{
+    notmonitored,
+    unknown,
+    removed,
+    inserted
+};
+
+class DeviceMonitor
+{
+  public:
+    DeviceMonitor(boost::asio::io_context& ioc) : ioc(ioc), monitorSd(ioc)
+    {
+        udev = std::unique_ptr<udev::udev, udev::udevDeleter>(udev::udev_new());
+        if (!udev)
+        {
+            throw std::system_error(EFAULT, std::generic_category(),
+                                    "Unable to create uDev handler.");
+        }
+
+        monitor = std::unique_ptr<udev::udev_monitor, udev::monitorDeleter>(
+            udev::udev_monitor_new_from_netlink(udev.get(), "kernel"));
+
+        if (!monitor)
+        {
+            throw std::system_error(EFAULT, std::generic_category(),
+                                    "Unable to create uDev Monitor handler.");
+        }
+        int rc = udev_monitor_filter_add_match_subsystem_devtype(
+            monitor.get(), "block", "disk");
+
+        if (rc)
+        {
+            throw std::system_error(EFAULT, std::generic_category(),
+                                    "Could not apply filters.");
+        }
+        rc = udev_monitor_enable_receiving(monitor.get());
+        if (rc)
+        {
+            throw std::system_error(EFAULT, std::generic_category(),
+                                    "Enable receiving failed.");
+        }
+        monitorSd.assign(udev_monitor_get_fd(monitor.get()));
+    }
+
+    DeviceMonitor(const DeviceMonitor&) = delete;
+    DeviceMonitor(DeviceMonitor&&) = delete;
+
+    DeviceMonitor& operator=(const DeviceMonitor&) = delete;
+    DeviceMonitor& operator=(DeviceMonitor&&) = delete;
+
+    template <typename DeviceChangeStateCb>
+    void run(DeviceChangeStateCb callback)
+    {
+        boost::asio::spawn(ioc, [this,
+                                 callback](boost::asio::yield_context yield) {
+            boost::system::error_code ec;
+            while (1)
+            {
+                monitorSd.async_wait(
+                    boost::asio::posix::stream_descriptor::wait_read,
+                    yield[ec]);
+
+                std::unique_ptr<udev::udev_device, udev::deviceDeleter> device =
+                    std::unique_ptr<udev::udev_device, udev::deviceDeleter>(
+                        udev::udev_monitor_receive_device(monitor.get()));
+                if (device)
+                {
+                    const char* devAction =
+                        udev_device_get_action(device.get());
+                    if (devAction == nullptr)
+                    {
+                        std::cerr << "Received NULL action.\n";
+                        continue;
+                    }
+                    if (strcmp(devAction, "change") == 0)
+                    {
+                        const char* sysname =
+                            udev_device_get_sysname(device.get());
+                        if (sysname == nullptr)
+                        {
+                            std::cerr << "Received NULL sysname.\n";
+                            continue;
+                        }
+                        auto monitoredDevice = devices.find(sysname);
+                        if (monitoredDevice != devices.cend())
+                        {
+                            const char* size_str =
+                                udev_device_get_sysattr_value(device.get(),
+                                                              "size");
+                            if (size_str == nullptr)
+                            {
+                                std::cerr << "Received NULL size.\n";
+                                continue;
+                            }
+                            uint64_t size = 0;
+                            try
+                            {
+                                size = std::stoul(size_str, 0, 0);
+                            }
+                            catch (const std::exception& e)
+                            {
+                                std::cerr
+                                    << "Could not convert size to integer.\n";
+                                continue;
+                            }
+                            if (size > 0 && monitoredDevice->second !=
+                                                StateChange::inserted)
+                            {
+                                std::cout << sysname << " inserted.\n";
+                                monitoredDevice->second = StateChange::inserted;
+                                callback(sysname, StateChange::inserted);
+                            }
+                            else if (size == 0 && monitoredDevice->second !=
+                                                      StateChange::removed)
+                            {
+                                std::cout << sysname << " removed.\n";
+                                monitoredDevice->second = StateChange::removed;
+                                callback(sysname, StateChange::removed);
+                            }
+                        };
+                    }
+                }
+            }
+        });
+    }
+
+    void addDevice(const std::string& device)
+    {
+        std::cout << "Watch on /dev/" << device << '\n';
+        devices.insert(
+            std::pair<std::string, StateChange>(device, StateChange::unknown));
+    }
+
+    StateChange getState(const std::string& device)
+    {
+        auto monitoredDevice = devices.find(device);
+        if (monitoredDevice != devices.cend())
+        {
+            return monitoredDevice->second;
+        }
+        return StateChange::notmonitored;
+    }
+
+  private:
+    boost::asio::io_context& ioc;
+    boost::asio::posix::stream_descriptor monitorSd;
+
+    std::unique_ptr<udev::udev, udev::udevDeleter> udev;
+    std::unique_ptr<udev::udev_monitor, udev::monitorDeleter> monitor;
+
+    boost::container::flat_map<std::string, StateChange> devices;
+};
+
+class Process : public std::enable_shared_from_this<Process>
+{
+  public:
+    Process(boost::asio::io_context& ioc, const std::string& name) :
+        ioc(ioc), pipe(ioc), name(name)
+    {
+    }
+
+    template <typename ExitCb>
+    bool spawn(const std::vector<std::string>& args, ExitCb&& onExit)
+    {
+        std::error_code ec;
+        child = boost::process::child(
+            "/usr/sbin/nbd-client",
+            //"/sbin/nbd-client", "-N", "otherexport", "127.0.0.1", "/dev/nbd0",
+            //"-n",
+            boost::process::args(args),
+            boost::process::on_exit(
+                [name(this->name), onExit{std::move(onExit)}](
+                    int exit, const std::error_code& ecIn) {
+                    std::cout << "- child " << name << "(" << exit << " "
+                              << ecIn << ")\n";
+                    auto process = processList.find(name);
+                    if (process != processList.end() && process->second)
+                    {
+                        std::cout << "Removing process from processList\n";
+                        process->second.reset();
+                    }
+                    onExit(name);
+                }),
+            (boost::process::std_out & boost::process::std_err) > pipe, ec,
+            ioc);
+
+        if (ec)
+        {
+            std::cerr << "Error while creating child process: " << ec << '\n';
+            return false;
+        }
+
+        boost::asio::spawn(ioc, [this, self = shared_from_this()](
+                                    boost::asio::yield_context yield) {
+            boost::system::error_code bec;
+            std::string line;
+            boost::asio::dynamic_string_buffer buffer{line};
+            std::cout << "Entering COUT Loop\n";
+            while (1)
+            {
+                auto x = boost::asio::async_read_until(pipe, std::move(buffer),
+                                                       '\n', yield[bec]);
+                std::cout << "-[" << name << "]-> " << line;
+                buffer.consume(x);
+                if (bec)
+                {
+                    std::cerr << "Loop Error: " << bec << '\n';
+                    break;
+                }
+            }
+            std::cout << "Exiting from COUT Loop\n";
+        });
+        return true;
+    }
+
+    void terminate(int signal = SIGTERM)
+    {
+        int rc = kill(child.id(), SIGTERM);
+        if (rc)
+        {
+            return;
+        }
+        child.wait();
+    }
+
+    static void addProcess(const std::string& name)
+    {
+        processList[name] = nullptr;
+    }
+
+    template <typename ExitCb>
+    static bool spawn(boost::asio::io_context& ioc, const std::string& name,
+                      const std::vector<std::string>& args, ExitCb&& onExit)
+    {
+        auto process = processList.find(name);
+        if (process != processList.end() && !process->second)
+        {
+            std::cout << "Spawning process for " << name << '\n';
+
+            auto newProcess = std::make_shared<Process>(ioc, name);
+            if (newProcess->spawn(args, onExit))
+            {
+                process->second = newProcess;
+                return true;
+            }
+            std::cout << "Process (" << name << ") exited immediately.\n";
+            return false;
+        }
+        std::cout << "No process (" << name << ") to be spawned.\n";
+        return false;
+    }
+
+    static bool terminate(const std::string& name, int signal = SIGTERM)
+    {
+        auto process = processList.find(name);
+        if (process != processList.end() && process->second)
+        {
+            std::cout << "Terminating " << name << '\n';
+            process->second->terminate(signal);
+            return true;
+        }
+        std::cout << "No process (" << name << ") for termination.\n";
+        return false;
+    }
+
+    static bool isActive(const std::string& name)
+    {
+        auto process = processList.find(name);
+        if (process != processList.end())
+        {
+            if (process->second)
+            {
+                return true;
+            }
+        }
+        return false;
+    }
+
+  private:
+    boost::asio::io_context& ioc;
+    boost::process::child child;
+    boost::process::async_pipe pipe;
+    std::string name;
+    inline static boost::container::flat_map<std::string,
+                                             std::shared_ptr<Process>>
+        processList;
+};
+
+class Configuration
+{
+  public:
+    struct MountPoint
+    {
+        std::string nbdDevice;
+        std::string unixSocket;
+        std::string endPointId;
+        std::optional<int> timeout;
+        std::optional<int> blocksize;
+
+        static std::vector<std::string> toArgs(const MountPoint& mp)
+        {
+            std::vector<std::string> args = {
+                "-N",          "otherexport",          "-u",
+                mp.unixSocket, "/dev/" + mp.nbdDevice, "-n"};
+            return args;
+        }
+    };
+
+    bool valid = false;
+    boost::container::flat_map<std::string, MountPoint> mountPoints;
+
+    Configuration(const std::string& file)
+    {
+        valid = loadConfiguration(file);
+    }
+
+  private:
+    bool loadConfiguration(const std::string& file) noexcept
+    {
+        std::ifstream configFile(file);
+        if (!configFile.is_open())
+        {
+            std::cout << "Could not open configuration file\n";
+            return false;
+        }
+        try
+        {
+            auto data = nlohmann::json::parse(configFile, nullptr);
+            setupVariables(data);
+        }
+        catch (nlohmann::json::exception& e)
+        {
+            std::cerr << "Error parsing JSON file\n";
+            return false;
+        }
+        catch (std::out_of_range& e)
+        {
+            std::cerr << "Error parsing JSON file\n";
+            return false;
+        }
+        return true;
+    }
+
+    bool setupVariables(const nlohmann::json& config)
+    {
+        for (const auto& item : config.items())
+        {
+            if (item.key() == "MountPoints")
+            {
+                for (const auto& mountpoint : item.value().items())
+                {
+                    MountPoint mp;
+                    const auto nbdDeviceIter =
+                        mountpoint.value().find("NBDDevice");
+                    if (nbdDeviceIter != mountpoint.value().cend())
+                    {
+                        const std::string* value =
+                            nbdDeviceIter->get_ptr<const std::string*>();
+                        if (value)
+                        {
+                            mp.nbdDevice = *value;
+                        }
+                        else
+                        {
+                            std::cerr << "NBDDevice required, not set\n";
+                            continue;
+                        }
+                    };
+                    const auto unixSocketIter =
+                        mountpoint.value().find("UnixSocket");
+                    if (unixSocketIter != mountpoint.value().cend())
+                    {
+                        const std::string* value =
+                            unixSocketIter->get_ptr<const std::string*>();
+                        if (value)
+                        {
+                            mp.unixSocket = *value;
+                        }
+                        else
+                        {
+                            std::cerr << "UnixSocket required, not set\n";
+                            continue;
+                        }
+                    }
+                    const auto endPointIdIter =
+                        mountpoint.value().find("EndpointId");
+                    if (endPointIdIter != mountpoint.value().cend())
+                    {
+                        const std::string* value =
+                            endPointIdIter->get_ptr<const std::string*>();
+                        if (value)
+                        {
+                            mp.endPointId = *value;
+                        }
+                        else
+                        {
+                            std::cerr << "EndpointId required, not set\n";
+                            continue;
+                        }
+                    }
+                    const auto timeoutIter = mountpoint.value().find("Timeout");
+                    if (timeoutIter != mountpoint.value().cend())
+                    {
+                        const uint64_t* value =
+                            timeoutIter->get_ptr<const uint64_t*>();
+                        if (value)
+                        {
+                            mp.timeout = *value;
+                        }
+                        else
+                        {
+                            std::cout << "Timeout not set, use default\n";
+                        }
+                    }
+                    const auto blocksizeIter =
+                        mountpoint.value().find("BlockSize");
+                    if (blocksizeIter != mountpoint.value().cend())
+                    {
+                        const uint64_t* value =
+                            blocksizeIter->get_ptr<const uint64_t*>();
+                        if (value)
+                        {
+                            mp.blocksize = *value;
+                        }
+                        else
+                        {
+                            std::cout << "BlockSize not set, use default\n";
+                        }
+                    }
+                    mountPoints[mountpoint.key()] = std::move(mp);
+                }
+            }
+        }
+        return true;
+    }
+};
+
+class App
+{
+  public:
+    App(boost::asio::io_context& ioc, const Configuration& config,
+        sd_bus* custom_bus = nullptr) :
+        ioc(ioc),
+        devMonitor(ioc), config(config)
+    {
+        if (!custom_bus)
+        {
+            bus = std::make_shared<sdbusplus::asio::connection>(ioc);
+        }
+        else
+        {
+            bus =
+                std::make_shared<sdbusplus::asio::connection>(ioc, custom_bus);
+        }
+        objServer = std::make_shared<sdbusplus::asio::object_server>(bus);
+        bus->request_name("xyz.openbmc_project.VirtualMedia");
+        objManager = std::make_shared<sdbusplus::server::manager::manager>(
+            *bus, "/xyz/openbmc_project/VirtualMedia");
+        for (const auto& entry : config.mountPoints)
+        {
+            devMonitor.addDevice(entry.second.nbdDevice);
+            Process::addProcess(entry.first);
+
+            addMountPointInterface(entry.first, entry.second);
+            addProxyInterface(entry.first, entry.second);
+            addProcessInterface(entry.first);
+        }
+        devMonitor.run([this](const std::string& device, StateChange change) {
+            configureUsbGadget(device, change);
+        });
+    };
+
+  private:
+    bool echoToFile(const fs::path& fname, const std::string& content)
+    {
+        std::ofstream fileWriter;
+        fileWriter.exceptions(std::ofstream::failbit | std::ofstream::badbit);
+        fileWriter.open(fname, std::ios::out | std::ios::app);
+        fileWriter << content << std::endl; // Make sure for new line and flush
+        fileWriter.close();
+        return true;
+    }
+
+    bool configureUsbGadget(const std::string& device, StateChange change)
+    {
+        bool success = true;
+        std::error_code ec;
+        if (change == StateChange::unknown)
+        {
+            std::cerr << "Change to unknown state is not possible\n";
+            return false;
+        }
+        StateChange currentState = devMonitor.getState(device);
+        if (currentState == StateChange::notmonitored)
+        {
+            std::cerr << "Unregistered device\n";
+            return false;
+        }
+
+        const fs::path gadgetDir =
+            "/sys/kernel/config/usb_gadget/mass-storage-" + device;
+        const fs::path funcMassStorageDir =
+            gadgetDir / "functions/mass_storage.usb0";
+        const fs::path stringsDir = gadgetDir / "strings/0x409";
+        const fs::path configDir = gadgetDir / "configs/c.1";
+        const fs::path massStorageDir = configDir / "mass_storage.usb0";
+        const fs::path configStringsDir = configDir / "strings/0x409";
+
+        if (change == StateChange::inserted)
+        {
+            try
+            {
+                fs::create_directories(gadgetDir);
+                echoToFile(gadgetDir / "idVendor", "0x1d6b");
+                echoToFile(gadgetDir / "idProduct", "0x0104");
+                fs::create_directories(stringsDir);
+                echoToFile(stringsDir / "manufacturer", "OpenBMC");
+                echoToFile(stringsDir / "product", "Virtual Media Device");
+                fs::create_directories(configStringsDir);
+                echoToFile(configStringsDir / "configuration", "config 1");
+                fs::create_directories(funcMassStorageDir);
+                fs::create_directories(funcMassStorageDir / "lun.0");
+                fs::create_directory_symlink(funcMassStorageDir,
+                                             massStorageDir);
+                echoToFile(funcMassStorageDir / "lun.0/removable", "1");
+                echoToFile(funcMassStorageDir / "lun.0/ro", "1");
+                echoToFile(funcMassStorageDir / "lun.0/cdrom", "0");
+                echoToFile(funcMassStorageDir / "lun.0/file", "/dev/" + device);
+
+                for (const auto& port : fs::directory_iterator(
+                         "/sys/bus/platform/devices/1e6a0000.usb-vhub"))
+                {
+                    if (fs::is_directory(port) && !fs::is_symlink(port) &&
+                        !fs::exists(port.path() / "gadget/suspended"))
+                    {
+                        const std::string portId = port.path().filename();
+                        std::cout << "Use port : " << port.path().filename()
+                                  << '\n';
+                        echoToFile(gadgetDir / "UDC", portId);
+                        return true;
+                    }
+                }
+            }
+            catch (fs::filesystem_error& e)
+            {
+                // Got error perform cleanup
+                std::cerr << e.what() << '\n';
+                success = false;
+            }
+            catch (std::ofstream::failure& e)
+            {
+                // Got error perform cleanup
+                std::cerr << e.what() << '\n';
+                success = false;
+            }
+        }
+        // StateChange: unknown, notmonitored, inserted were handler
+        // earlier. We'll get here only for removed, or cleanup
+
+        fs::remove_all(massStorageDir, ec);
+        if (ec)
+        {
+            std::cerr << ec.message() << '\n';
+        }
+        fs::remove_all(funcMassStorageDir, ec);
+        if (ec)
+        {
+            std::cerr << ec.message() << '\n';
+        }
+        fs::remove_all(configStringsDir, ec);
+        if (ec)
+        {
+            std::cerr << ec.message() << '\n';
+        }
+        fs::remove_all(configDir, ec);
+        if (ec)
+        {
+            std::cerr << ec.message() << '\n';
+        }
+        fs::remove_all(stringsDir, ec);
+        if (ec)
+        {
+            std::cerr << ec.message() << '\n';
+        }
+        fs::remove_all(gadgetDir, ec);
+        if (ec)
+        {
+            std::cerr << ec.message() << '\n';
+        }
+        return (success && !static_cast<bool>(ec));
+    }
+
+    void addMountPointInterface(const std::string& name,
+                                const Configuration::MountPoint& mp)
+    {
+        auto iface = objServer->add_interface(
+            "/xyz/openbmc_project/VirtualMedia/Proxy/" + name,
+            "xyz.openbmc_project.VirtualMedia.MountPoint");
+        iface->register_property("Device", mp.nbdDevice);
+        iface->register_property("EndpointId", mp.endPointId);
+        iface->register_property("Socket", mp.unixSocket);
+        iface->register_property("Timeout", *mp.timeout);
+        iface->register_property("BlockSize", *mp.blocksize);
+        iface->initialize();
+    };
+
+    void addProxyInterface(const std::string& name,
+                           const Configuration::MountPoint& mp)
+    {
+        auto iface = objServer->add_interface(
+            "/xyz/openbmc_project/VirtualMedia/Proxy/" + name,
+            "xyz.openbmc_project.VirtualMedia.Proxy");
+        iface->register_method(
+            "Mount", [&, name, args(Configuration::MountPoint::toArgs(mp))]() {
+                return Process::spawn(
+                    ioc, name, args, [this](const std::string& name) {
+                        configureUsbGadget(name, StateChange::removed);
+                    });
+            });
+        iface->register_method("Unmount", [this, name]() {
+            const auto mp = config.mountPoints.find(name);
+            std::string nbdDevice = mp->second.nbdDevice;
+            configureUsbGadget(nbdDevice, StateChange::removed);
+            return Process::terminate(name);
+        });
+        iface->initialize();
+    }
+
+    void addProcessInterface(const std::string& name)
+    {
+        auto iface = objServer->add_interface(
+            "/xyz/openbmc_project/VirtualMedia/Proxy/" + name,
+            "xyz.openbmc_project.VirtualMedia.Process");
+        iface->register_property(
+            "Active", bool(false),
+            [](const bool& req, bool& property) { return 0; },
+            [name](const bool& property) { return Process::isActive(name); });
+        iface->initialize();
+    }
+
+    boost::asio::io_context& ioc;
+    DeviceMonitor devMonitor;
+    std::shared_ptr<sdbusplus::asio::connection> bus;
+    std::shared_ptr<sdbusplus::asio::object_server> objServer;
+    std::shared_ptr<sdbusplus::server::manager::manager> objManager;
+    const Configuration& config;
+};
+
+int main()
+{
+    Configuration config("/etc/virtual-media.json");
+    if (!config.valid)
+        return -1;
+
+    boost::asio::io_context ioc;
+    boost::asio::signal_set signals(ioc, SIGINT, SIGTERM);
+    signals.async_wait(
+        [&ioc](const boost::system::error_code&, const int&) { ioc.stop(); });
+
+    sd_bus* b = nullptr;
+#if defined(CUSTOM_DBUS_PATH)
+#pragma message("You are using custom DBUS path set to " CUSTOM_DBUS_PATH)
+    sd_bus_new(&b);
+    sd_bus_set_bus_client(b, true);
+    sd_bus_set_address(b, CUSTOM_DBUS_PATH);
+    sd_bus_start(b);
+#endif
+    App app(ioc, config, b);
+
+    ioc.run();
+
+    return 0;
+}
diff --git a/virtual-media.json b/virtual-media.json
new file mode 100644
index 0000000..3c61583
--- /dev/null
+++ b/virtual-media.json
@@ -0,0 +1,22 @@
+{
+    "InactivityTimeout": 1800,
+    "MountPoints": {
+        "ISO0": {
+            "EndpointId": "/nbd/0",
+            "Mode": 0,
+            "NBDDevice": "nbd0",
+            "UnixSocket": "/tmp/nbd0.sock",
+            "Timeout": 30,
+            "BlockSize": 512
+        },
+        "USB0": {
+            "EndpointId": "/nbd/1",
+            "Mode": 0,
+            "NBDDevice": "nbd1",
+            "UnixSocket": "/tmp/nbd1.sock",
+            "Timeout": 30,
+            "BlockSize": 512
+        }
+    }
+}
+
diff --git a/xyz.openbmc_project.VirtualMedia.service b/xyz.openbmc_project.VirtualMedia.service
new file mode 100644
index 0000000..b5c21ae
--- /dev/null
+++ b/xyz.openbmc_project.VirtualMedia.service
@@ -0,0 +1,11 @@
+[Unit]
+Description=Virtual Media Service
+After=dbus.service
+
+[Service]
+ExecStart=/usr/sbin/virtual-media
+Restart=always
+Type=simple
+
+[Install]
+WantedBy=multi-user.target