writefrudata.cpp - openbmc/ipmi-fru-parser - Gitiles

 #include <exception>
 #include <vector>
 #include <stdlib.h>
 #include <dlfcn.h>
 #include <errno.h>
 #include <stdio.h>
 #include <systemd/sd-bus.h>
 #include <unistd.h>
 #include <host-ipmid/ipmid-api.h>
 #include <iostream>
 #include <memory>
 #include <algorithm>
 #include <fstream>
 #include <sstream>
 #include <mapper.h>
 #include "types.hpp"
 #include "frup.hpp"
 #include "fru-area.hpp"
 #include <sdbusplus/server.hpp>

 using namespace ipmi::vpd;

 extern const FruMap frus;
 extern const std::map<Path, InterfaceMap> extras;

 //----------------------------------------------------------------
 // Constructor
 //----------------------------------------------------------------
 ipmi_fru::ipmi_fru(const uint8_t fruid, const ipmi_fru_area_type type,
                    sd_bus *bus_type, bool bmc_fru)
 {
     iv_fruid = fruid;
     iv_type = type;
     iv_bmc_fru = bmc_fru;
     iv_bus_type = bus_type;
     iv_valid = false;
     iv_data = NULL;
     iv_present = false;

     if(iv_type == IPMI_FRU_AREA_INTERNAL_USE)
     {
         iv_name = "INTERNAL_";
     }
     else if(iv_type == IPMI_FRU_AREA_CHASSIS_INFO)
     {
         iv_name = "CHASSIS_";
     }
     else if(iv_type == IPMI_FRU_AREA_BOARD_INFO)
     {
         iv_name = "BOARD_";
     }
     else if(iv_type == IPMI_FRU_AREA_PRODUCT_INFO)
     {
         iv_name = "PRODUCT_";
     }
     else if(iv_type == IPMI_FRU_AREA_MULTI_RECORD)
     {
         iv_name = "MULTI_";
     }
     else
     {
         iv_name = IPMI_FRU_AREA_TYPE_MAX;
         fprintf(stderr, "ERROR: Invalid Area type :[%d]\n",iv_type);
     }
 }

 //-----------------------------------------------------
 // For a FRU area type, accepts the data and updates
 // area specific data.
 //-----------------------------------------------------
 void ipmi_fru::set_data(const uint8_t *data, const size_t len)
 {
     iv_len = len;
     iv_data = new uint8_t[len];
     memcpy(iv_data, data, len);
 }

 //-----------------------------------------------------
 // Sets the dbus parameters
 //-----------------------------------------------------
 void ipmi_fru::update_dbus_paths(const char *bus_name,
                       const char *obj_path, const char *intf_name)
 {
     iv_bus_name = bus_name;
     iv_obj_path = obj_path;
     iv_intf_name = intf_name;
 }

 //-------------------
 // Destructor
 //-------------------
 ipmi_fru::~ipmi_fru()
 {
     if(iv_data != NULL)
     {
         delete [] iv_data;
         iv_data = NULL;
     }
 }

 //------------------------------------------------
 // Takes the pointer to stream of bytes and length
 // and returns the 8 bit checksum
 // This algo is per IPMI V2.0 spec
 //-------------------------------------------------
 unsigned char calculate_crc(const unsigned char *data, size_t len)
 {
     char crc = 0;
     size_t byte = 0;

     for(byte = 0; byte < len; byte++)
     {
         crc += *data++;
     }

     return(-crc);
 }

 //---------------------------------------------------------------------
 // Accepts a fru area offset in commom hdr and tells which area it is.
 //---------------------------------------------------------------------
 ipmi_fru_area_type get_fru_area_type(uint8_t area_offset)
 {
     ipmi_fru_area_type type = IPMI_FRU_AREA_TYPE_MAX;

     switch(area_offset)
     {
         case IPMI_FRU_INTERNAL_OFFSET:
             type = IPMI_FRU_AREA_INTERNAL_USE;
             break;

         case IPMI_FRU_CHASSIS_OFFSET:
             type = IPMI_FRU_AREA_CHASSIS_INFO;
             break;

         case IPMI_FRU_BOARD_OFFSET:
             type = IPMI_FRU_AREA_BOARD_INFO;
             break;

         case IPMI_FRU_PRODUCT_OFFSET:
             type = IPMI_FRU_AREA_PRODUCT_INFO;
             break;

         case IPMI_FRU_MULTI_OFFSET:
             type = IPMI_FRU_AREA_MULTI_RECORD;
             break;

         default:
             type = IPMI_FRU_AREA_TYPE_MAX;
     }

     return type;
 }

 ///-----------------------------------------------
 // Validates the data for crc and mandatory fields
 ///-----------------------------------------------
 int verify_fru_data(const uint8_t *data, const size_t len)
 {
     uint8_t checksum = 0;
     int rc = -1;

     // Validate for first byte to always have a value of [1]
     if(data[0] != IPMI_FRU_HDR_BYTE_ZERO)
     {
         fprintf(stderr, "Invalid entry:[%d] in byte-0\n",data[0]);
         return rc;
     }
 #ifdef __IPMI_DEBUG__
     else
     {
         printf("SUCCESS: Validated [0x%X] in entry_1 of fru_data\n",data[0]);
     }
 #endif

     // See if the calculated CRC matches with the embedded one.
     // CRC to be calculated on all except the last one that is CRC itself.
     checksum = calculate_crc(data, len - 1);
     if(checksum != data[len-1])
     {
 #ifdef __IPMI_DEBUG__
         fprintf(stderr, "Checksum mismatch."
                 " Calculated:[0x%X], Embedded:[0x%X]\n",
                 checksum, data[len]);
 #endif
         return rc;
     }
 #ifdef __IPMI_DEBUG__
     else
     {
         printf("SUCCESS: Checksum matches:[0x%X]\n",checksum);
     }
 #endif

     return EXIT_SUCCESS;
 }

 //------------------------------------------------------------------------
 // Gets the value of the key from the fru dictionary of the given section.
 // FRU dictionary is parsed fru data for all the sections.
 //------------------------------------------------------------------------

 std::string getFRUValue(const std::string& section,
                         const std::string& key,
                         const std::string& delimiter,
                         IPMIFruInfo& fruData)
 {

     auto minIndexValue = 0;
     auto maxIndexValue = 0;
     std::string fruValue = "";
     if (section == "Board")
     {
         minIndexValue = OPENBMC_VPD_KEY_BOARD_MFG_DATE;
         maxIndexValue = OPENBMC_VPD_KEY_BOARD_MAX;
     }
     else if (section == "Product")
     {
         minIndexValue = OPENBMC_VPD_KEY_PRODUCT_MFR;
         maxIndexValue = OPENBMC_VPD_KEY_PRODUCT_MAX;

     }
     else if (section == "Chassis")
     {
         minIndexValue = OPENBMC_VPD_KEY_CHASSIS_TYPE;
         maxIndexValue = OPENBMC_VPD_KEY_CHASSIS_MAX;
     }

     auto first = fruData.cbegin() + minIndexValue;
     auto last = first + (maxIndexValue - minIndexValue) + 1;

     auto itr = std::find_if(first, last,
             [&key](auto& e){ return key == e.first; });

     if (itr != last)
     {
         fruValue = itr->second;
     }

     //if the key is custom property then the value could be in two formats.
     //1) custom field 2 = "value".
     //2) custom field 2 =  "key:value".
     //if delimeter length = 0 i.e custom field 2 = "value"

     constexpr auto customProp = "Custom Field";
     if (key.find(customProp) != std::string::npos)
     {
        if (delimiter.length() > 0)
        {
            size_t delimiterpos = fruValue.find(delimiter);
            if (delimiterpos != std::string::npos)
                fruValue = fruValue.substr(delimiterpos + 1);
        }
     }
     return fruValue;

 }
 //Get the inventory service from the mapper.
 auto getService(sdbusplus::bus::bus& bus,
                          const std::string& intf,
                          const std::string& path)
 {
     auto mapperCall = bus.new_method_call(
             "xyz.openbmc_project.ObjectMapper",
             "/xyz/openbmc_project/object_mapper",
             "xyz.openbmc_project.ObjectMapper",
             "GetObject");

     mapperCall.append(path);
     mapperCall.append(std::vector<std::string>({intf}));

     auto mapperResponseMsg = bus.call(mapperCall);
     if (mapperResponseMsg.is_method_error())
     {
         throw std::runtime_error("ERROR in mapper call");
     }

     std::map<std::string, std::vector<std::string>> mapperResponse;
     mapperResponseMsg.read(mapperResponse);

     if (mapperResponse.begin() == mapperResponse.end())
     {
         throw std::runtime_error("ERROR in reading the mapper response");
     }

     return mapperResponse.begin()->first;
 }

 //------------------------------------------------------------------------
 // Takes FRU data, invokes Parser for each fru record area and updates
 // Inventory
 //------------------------------------------------------------------------
 int ipmi_update_inventory(fru_area_vec_t& area_vec, sd_bus* bus_sd)
 {
     // Generic error reporter
     int rc = 0;
     uint8_t fruid = 0;
     IPMIFruInfo fruData;

     // For each FRU area, extract the needed data , get it parsed and update
     // the Inventory.
     for (const auto& fruArea : area_vec)
     {
         fruid = fruArea->get_fruid();
         // Fill the container with information
         rc = parse_fru_area((fruArea)->get_type(), (void*)(fruArea)->get_data(),
                             (fruArea)->get_len(), fruData);
         if (rc < 0)
         {
             std::cerr << "ERROR parsing FRU records\n";
             return rc;
         }
     } // END walking the vector of areas and updating

     // For each Fru we have the list of instances which needs to be updated.
     // Each instance object implements certain interfaces.
     // Each Interface is having Dbus properties.
     // Each Dbus Property would be having metaData(eg section,VpdPropertyName).

     // Here we are just printing the object,interface and the properties.
     // which needs to be called with the new inventory manager implementation.
     sdbusplus::bus::bus bus{bus_sd};
     using namespace std::string_literals;
     static const auto intf = "xyz.openbmc_project.Inventory.Manager"s;
     static const auto path = "/xyz/openbmc_project/inventory"s;
     std::string service;
     try
     {
         service = getService(bus,intf,path);
     }
     catch (const std::runtime_error& e)
     {
         std::cerr << e.what() << "\n";
         return -1;
     }

     auto iter = frus.find(fruid);
     if (iter == frus.end())
     {
         std::cerr << "ERROR Unable to get the fru info for FRU="
                   << static_cast<int>(fruid) << "\n";
         return -1;
     }

     auto& instanceList = iter->second;
     if (instanceList.size() <= 0)
     {
         std::cout << "Object List empty for this FRU="
                   << static_cast<int>(fruid) << "\n";
     }

     ObjectMap objects;
     for (auto& instance : instanceList)
     {
         InterfaceMap interfaces;
         const auto& extrasIter = extras.find(instance.first);

         for (auto& interfaceList : instance.second)
         {
             PropertyMap props;//store all the properties
             for (auto& properties : interfaceList.second)
             {
                 std::string section, property, delimiter, value;
                 for (auto& info : properties.second)
                 {
                     if (info.first == "IPMIFruSection")
                     {
                         section = std::move(info.second);
                     }
                     if (info.first == "IPMIFruProperty")
                     {
                         property = std::move(info.second);
                     }
                     if (info.first == "IPMIFruValueDelimiter")
                     {
                         //Read the delimeter as ascii value
                         //convert it into char
                         if( info.second.length() > 0 )
                         {
                             char dlm = ' ';
                             rc = sscanf(info.second.c_str(),"%hhd",&dlm);
                             if (rc > 0)
                             {
                                 delimiter = std::string(1,dlm);
                             }
                         }
                     }

                 }

                 if (!section.empty() && !property.empty())
                 {
                     value = getFRUValue(section, property, delimiter, fruData);
                 }
                 props.emplace(std::move(properties.first), std::move(value));
             }
             // Check and update extra properties
             if(extras.end() != extrasIter)
             {
                 const auto& propsIter =
                     (extrasIter->second).find(interfaceList.first);
                 if((extrasIter->second).end() != propsIter)
                 {
                     for(const auto& map : propsIter->second)
                     {
                         props.emplace(map.first, map.second);
                     }
                 }
             }
             interfaces.emplace(std::move(interfaceList.first),
                                std::move(props));
         }

         // Call the inventory manager
         sdbusplus::message::object_path path = instance.first;
         // Check and update extra properties
         if(extras.end() != extrasIter)
         {
             for(const auto& entry : extrasIter->second)
             {
                 if(interfaces.end() == interfaces.find(entry.first))
                 {
                     interfaces.emplace(entry.first, entry.second);
                 }
             }
         }
         objects.emplace(path,interfaces);
     }

     auto pimMsg = bus.new_method_call(
                           service.c_str(),
                           path.c_str(),
                           intf.c_str(),
                           "Notify");
     pimMsg.append(std::move(objects));
     auto inventoryMgrResponseMsg = bus.call(pimMsg);
     if (inventoryMgrResponseMsg.is_method_error())
     {
         std::cerr << "Error in notify call\n";
         return -1;
     }
     return rc;
 }

 ///----------------------------------------------------
 // Checks if a particular fru area is populated or not
 ///----------------------------------------------------
 bool remove_invalid_area(const std::unique_ptr<ipmi_fru> &fru_area)
 {
     // Filter the ones that are empty
     if(!(fru_area->get_len()))
     {
         return true;
     }
     return false;
 }

 ///----------------------------------------------------------------------------------
 // Populates various FRU areas
 // @prereq : This must be called only after validating common header.
 ///----------------------------------------------------------------------------------
 int ipmi_populate_fru_areas(uint8_t *fru_data, const size_t data_len,
                             fru_area_vec_t & fru_area_vec)
 {
     size_t area_offset = 0;
     int rc = -1;

     // Now walk the common header and see if the file size has atleast the last
     // offset mentioned by the common_hdr. If the file size is less than the
     // offset of any if the fru areas mentioned in the common header, then we do
     // not have a complete file.
     for(uint8_t fru_entry = IPMI_FRU_INTERNAL_OFFSET;
             fru_entry < (sizeof(struct common_header) -2); fru_entry++)
     {
         rc = -1;
         // Actual offset in the payload is the offset mentioned in common header
         // multipled by 8. Common header is always the first 8 bytes.
         area_offset = fru_data[fru_entry] * IPMI_EIGHT_BYTES;
         if(area_offset && (data_len < (area_offset + 2)))
         {
             // Our file size is less than what it needs to be. +2 because we are
             // using area len that is at 2 byte off area_offset
             fprintf(stderr, "fru file is incomplete. Size:[%zd]\n",data_len);
             return rc;
         }
         else if(area_offset)
         {
             // Read 2 bytes to know the actual size of area.
             uint8_t area_hdr[2] = {0};
             memcpy(area_hdr, &((uint8_t *)fru_data)[area_offset], sizeof(area_hdr));

             // Size of this area will be the 2nd byte in the fru area header.
             size_t  area_len = area_hdr[1] * IPMI_EIGHT_BYTES;
             uint8_t area_data[area_len] = {0};

             printf("fru data size:[%zd], area offset:[%zd], area_size:[%zd]\n",
                     data_len, area_offset, area_len);

             // See if we really have that much buffer. We have area offset amd
             // from there, the actual len.
             if(data_len < (area_len + area_offset))
             {
                 fprintf(stderr, "Incomplete Fru file.. Size:[%zd]\n",data_len);
                 return rc;
             }

             // Save off the data.
             memcpy(area_data, &((uint8_t *)fru_data)[area_offset], area_len);

             // Validate the crc
             rc = verify_fru_data(area_data, area_len);
             if(rc < 0)
             {
                 fprintf(stderr, "Error validating fru area. offset:[%zd]\n",area_offset);
                 return rc;
             }
             else
             {
                 printf("Successfully verified area checksum. offset:[%zd]\n",area_offset);
             }

             // We already have a vector that is passed to us containing all
             // of the fields populated. Update the data portion now.
             for(auto& iter : fru_area_vec)
             {
                 if((iter)->get_type() == get_fru_area_type(fru_entry))
                 {
                     (iter)->set_data(area_data, area_len);
                 }
             }
         } // If we have fru data present
     } // Walk common_hdr

     // Not all the fields will be populated in a fru data. Mostly all cases will
     // not have more than 2 or 3.
     fru_area_vec.erase(std::remove_if(fru_area_vec.begin(), fru_area_vec.end(),
                        remove_invalid_area), fru_area_vec.end());

     return EXIT_SUCCESS;
 }

 ///---------------------------------------------------------
 // Validates the fru data per ipmi common header constructs.
 // Returns with updated common_hdr and also file_size
 //----------------------------------------------------------
 int ipmi_validate_common_hdr(const uint8_t *fru_data, const size_t data_len)
 {
     int rc = -1;

     uint8_t common_hdr[sizeof(struct common_header)] = {0};
     if(data_len >= sizeof(common_hdr))
     {
         memcpy(common_hdr, fru_data, sizeof(common_hdr));
     }
     else
     {
         fprintf(stderr, "Incomplete fru data file. Size:[%zd]\n", data_len);
         return rc;
     }

     // Verify the crc and size
     rc = verify_fru_data(common_hdr, sizeof(common_hdr));
     if(rc < 0)
     {
         fprintf(stderr, "Failed to validate common header\n");
         return rc;
     }

     return EXIT_SUCCESS;
 }

 //------------------------------------------------------------
 // Cleanup routine
 //------------------------------------------------------------
 int cleanup_error(FILE *fru_fp, fru_area_vec_t & fru_area_vec)
 {
     if(fru_fp != NULL)
     {
         fclose(fru_fp);
         fru_fp = NULL;
     }

     if(!(fru_area_vec.empty()))
     {
         fru_area_vec.clear();
     }

     return  -1;
 }

 ///-----------------------------------------------------
 // Accepts the filename and validates per IPMI FRU spec
 //----------------------------------------------------
 int ipmi_validate_fru_area(const uint8_t fruid, const char *fru_file_name,
                            sd_bus *bus_type, const bool bmc_fru)
 {
     size_t data_len = 0;
     size_t bytes_read = 0;
     int rc = -1;

     // Vector that holds individual IPMI FRU AREAs. Although MULTI and INTERNAL
     // are not used, keeping it here for completeness.
     fru_area_vec_t fru_area_vec;
     std::vector<std::string> defined_fru_area;

     for(uint8_t fru_entry = IPMI_FRU_INTERNAL_OFFSET;
         fru_entry < (sizeof(struct common_header) -2); fru_entry++)
     {
         // Create an object and push onto a vector.
         std::unique_ptr<ipmi_fru> fru_area = std::make_unique<ipmi_fru>
                          (fruid, get_fru_area_type(fru_entry), bus_type, bmc_fru);

         // Physically being present
         bool present = access(fru_file_name, F_OK) == 0;
         fru_area->set_present(present);

         fru_area_vec.emplace_back(std::move(fru_area));
     }

     FILE *fru_fp = fopen(fru_file_name,"rb");
     if(fru_fp == NULL)
     {
         fprintf(stderr, "ERROR: opening:[%s]\n",fru_file_name);
         perror("Error:");
         return cleanup_error(fru_fp, fru_area_vec);
     }

     // Get the size of the file to see if it meets minimum requirement
     if(fseek(fru_fp, 0, SEEK_END))
     {
         perror("Error:");
         return cleanup_error(fru_fp, fru_area_vec);
     }

     // Allocate a buffer to hold entire file content
     data_len = ftell(fru_fp);
     uint8_t fru_data[data_len] = {0};

     rewind(fru_fp);
     bytes_read = fread(fru_data, data_len, 1, fru_fp);
     if(bytes_read != 1)
     {
         fprintf(stderr, "Failed reading fru data. Bytes_read=[%zd]\n",bytes_read);
         perror("Error:");
         return cleanup_error(fru_fp, fru_area_vec);
     }

     // We are done reading.
     fclose(fru_fp);
     fru_fp = NULL;

     rc = ipmi_validate_common_hdr(fru_data, data_len);
     if(rc < 0)
     {
         return cleanup_error(fru_fp, fru_area_vec);
     }

     // Now that we validated the common header, populate various fru sections if we have them here.
     rc = ipmi_populate_fru_areas(fru_data, data_len, fru_area_vec);
     if(rc < 0)
     {
         fprintf(stderr,"Populating FRU areas failed for:[%d]\n",fruid);
         return cleanup_error(fru_fp, fru_area_vec);
     }
     else
     {
         printf("SUCCESS: Populated FRU areas for:[%s]\n",fru_file_name);
     }

 #ifdef __IPMI_DEBUG__
     for(auto& iter : fru_area_vec)
     {
         printf("FRU ID : [%d]\n",(iter)->get_fruid());
         printf("AREA NAME : [%s]\n",(iter)->get_name());
         printf("TYPE : [%d]\n",(iter)->get_type());
         printf("LEN : [%d]\n",(iter)->get_len());
         printf("BUS NAME : [%s]\n", (iter)->get_bus_name());
         printf("OBJ PATH : [%s]\n", (iter)->get_obj_path());
         printf("INTF NAME :[%s]\n", (iter)->get_intf_name());
     }
 #endif

     // If the vector is populated with everything, then go ahead and update the
     // inventory.
     if(!(fru_area_vec.empty()))
     {

 #ifdef __IPMI_DEBUG__
         printf("\n SIZE of vector is : [%d] \n",fru_area_vec.size());
 #endif
         rc = ipmi_update_inventory(fru_area_vec, bus_type);
         if(rc <0)
         {
             fprintf(stderr, "Error updating inventory\n");
         }
     }

     // we are done with all that we wanted to do. This will do the job of
     // calling any destructors too.
     fru_area_vec.clear();

     return rc;
 }
	#include <exception>
	#include <vector>
	#include <stdlib.h>
	#include <dlfcn.h>
	#include <errno.h>
	#include <stdio.h>
	#include <systemd/sd-bus.h>
	#include <unistd.h>
	#include <host-ipmid/ipmid-api.h>
	#include <iostream>
	#include <memory>
	#include <algorithm>
	#include <fstream>
	#include <sstream>
	#include <mapper.h>
	#include "types.hpp"
	#include "frup.hpp"
	#include "fru-area.hpp"
	#include <sdbusplus/server.hpp>

	using namespace ipmi::vpd;

	extern const FruMap frus;
	extern const std::map<Path, InterfaceMap> extras;

	//----------------------------------------------------------------
	// Constructor
	//----------------------------------------------------------------
	ipmi_fru::ipmi_fru(const uint8_t fruid, const ipmi_fru_area_type type,
	sd_bus *bus_type, bool bmc_fru)
	{
	iv_fruid = fruid;
	iv_type = type;
	iv_bmc_fru = bmc_fru;
	iv_bus_type = bus_type;
	iv_valid = false;
	iv_data = NULL;
	iv_present = false;

	if(iv_type == IPMI_FRU_AREA_INTERNAL_USE)
	{
	iv_name = "INTERNAL_";
	}
	else if(iv_type == IPMI_FRU_AREA_CHASSIS_INFO)
	{
	iv_name = "CHASSIS_";
	}
	else if(iv_type == IPMI_FRU_AREA_BOARD_INFO)
	{
	iv_name = "BOARD_";
	}
	else if(iv_type == IPMI_FRU_AREA_PRODUCT_INFO)
	{
	iv_name = "PRODUCT_";
	}
	else if(iv_type == IPMI_FRU_AREA_MULTI_RECORD)
	{
	iv_name = "MULTI_";
	}
	else
	{
	iv_name = IPMI_FRU_AREA_TYPE_MAX;
	fprintf(stderr, "ERROR: Invalid Area type :[%d]\n",iv_type);
	}
	}

	//-----------------------------------------------------
	// For a FRU area type, accepts the data and updates
	// area specific data.
	//-----------------------------------------------------
	void ipmi_fru::set_data(const uint8_t *data, const size_t len)
	{
	iv_len = len;
	iv_data = new uint8_t[len];
	memcpy(iv_data, data, len);
	}

	//-----------------------------------------------------
	// Sets the dbus parameters
	//-----------------------------------------------------
	void ipmi_fru::update_dbus_paths(const char *bus_name,
	const char obj_path, const char intf_name)
	{
	iv_bus_name = bus_name;
	iv_obj_path = obj_path;
	iv_intf_name = intf_name;
	}

	//-------------------
	// Destructor
	//-------------------
	ipmi_fru::~ipmi_fru()
	{
	if(iv_data != NULL)
	{
	delete [] iv_data;
	iv_data = NULL;
	}
	}

	//------------------------------------------------
	// Takes the pointer to stream of bytes and length
	// and returns the 8 bit checksum
	// This algo is per IPMI V2.0 spec
	//-------------------------------------------------
	unsigned char calculate_crc(const unsigned char *data, size_t len)
	{
	char crc = 0;
	size_t byte = 0;

	for(byte = 0; byte < len; byte++)
	{
	crc += *data++;
	}

	return(-crc);
	}

	//---------------------------------------------------------------------
	// Accepts a fru area offset in commom hdr and tells which area it is.
	//---------------------------------------------------------------------
	ipmi_fru_area_type get_fru_area_type(uint8_t area_offset)
	{
	ipmi_fru_area_type type = IPMI_FRU_AREA_TYPE_MAX;

	switch(area_offset)
	{
	case IPMI_FRU_INTERNAL_OFFSET:
	type = IPMI_FRU_AREA_INTERNAL_USE;
	break;

	case IPMI_FRU_CHASSIS_OFFSET:
	type = IPMI_FRU_AREA_CHASSIS_INFO;
	break;

	case IPMI_FRU_BOARD_OFFSET:
	type = IPMI_FRU_AREA_BOARD_INFO;
	break;

	case IPMI_FRU_PRODUCT_OFFSET:
	type = IPMI_FRU_AREA_PRODUCT_INFO;
	break;

	case IPMI_FRU_MULTI_OFFSET:
	type = IPMI_FRU_AREA_MULTI_RECORD;
	break;

	default:
	type = IPMI_FRU_AREA_TYPE_MAX;
	}

	return type;
	}

	///-----------------------------------------------
	// Validates the data for crc and mandatory fields
	///-----------------------------------------------
	int verify_fru_data(const uint8_t *data, const size_t len)
	{
	uint8_t checksum = 0;
	int rc = -1;

	// Validate for first byte to always have a value of [1]
	if(data[0] != IPMI_FRU_HDR_BYTE_ZERO)
	{
	fprintf(stderr, "Invalid entry:[%d] in byte-0\n",data[0]);
	return rc;
	}
	#ifdef __IPMI_DEBUG__
	else
	{
	printf("SUCCESS: Validated [0x%X] in entry_1 of fru_data\n",data[0]);
	}
	#endif

	// See if the calculated CRC matches with the embedded one.
	// CRC to be calculated on all except the last one that is CRC itself.
	checksum = calculate_crc(data, len - 1);
	if(checksum != data[len-1])
	{
	#ifdef __IPMI_DEBUG__
	fprintf(stderr, "Checksum mismatch."
	" Calculated:[0x%X], Embedded:[0x%X]\n",
	checksum, data[len]);
	#endif
	return rc;
	}
	#ifdef __IPMI_DEBUG__
	else
	{
	printf("SUCCESS: Checksum matches:[0x%X]\n",checksum);
	}
	#endif

	return EXIT_SUCCESS;
	}

	//------------------------------------------------------------------------
	// Gets the value of the key from the fru dictionary of the given section.
	// FRU dictionary is parsed fru data for all the sections.
	//------------------------------------------------------------------------

	std::string getFRUValue(const std::string& section,
	const std::string& key,
	const std::string& delimiter,
	IPMIFruInfo& fruData)
	{

	auto minIndexValue = 0;
	auto maxIndexValue = 0;
	std::string fruValue = "";
	if (section == "Board")
	{
	minIndexValue = OPENBMC_VPD_KEY_BOARD_MFG_DATE;
	maxIndexValue = OPENBMC_VPD_KEY_BOARD_MAX;
	}
	else if (section == "Product")
	{
	minIndexValue = OPENBMC_VPD_KEY_PRODUCT_MFR;
	maxIndexValue = OPENBMC_VPD_KEY_PRODUCT_MAX;

	}
	else if (section == "Chassis")
	{
	minIndexValue = OPENBMC_VPD_KEY_CHASSIS_TYPE;
	maxIndexValue = OPENBMC_VPD_KEY_CHASSIS_MAX;
	}

	auto first = fruData.cbegin() + minIndexValue;
	auto last = first + (maxIndexValue - minIndexValue) + 1;

	auto itr = std::find_if(first, last,
	[&key](auto& e){ return key == e.first; });

	if (itr != last)
	{
	fruValue = itr->second;
	}

	//if the key is custom property then the value could be in two formats.
	//1) custom field 2 = "value".
	//2) custom field 2 = "key:value".
	//if delimeter length = 0 i.e custom field 2 = "value"

	constexpr auto customProp = "Custom Field";
	if (key.find(customProp) != std::string::npos)
	{
	if (delimiter.length() > 0)
	{
	size_t delimiterpos = fruValue.find(delimiter);
	if (delimiterpos != std::string::npos)
	fruValue = fruValue.substr(delimiterpos + 1);
	}
	}
	return fruValue;

	}
	//Get the inventory service from the mapper.
	auto getService(sdbusplus::bus::bus& bus,
	const std::string& intf,
	const std::string& path)
	{
	auto mapperCall = bus.new_method_call(
	"xyz.openbmc_project.ObjectMapper",
	"/xyz/openbmc_project/object_mapper",
	"xyz.openbmc_project.ObjectMapper",
	"GetObject");

	mapperCall.append(path);
	mapperCall.append(std::vector<std::string>({intf}));

	auto mapperResponseMsg = bus.call(mapperCall);
	if (mapperResponseMsg.is_method_error())
	{
	throw std::runtime_error("ERROR in mapper call");
	}

	std::map<std::string, std::vector<std::string>> mapperResponse;
	mapperResponseMsg.read(mapperResponse);

	if (mapperResponse.begin() == mapperResponse.end())
	{
	throw std::runtime_error("ERROR in reading the mapper response");
	}

	return mapperResponse.begin()->first;
	}

	//------------------------------------------------------------------------
	// Takes FRU data, invokes Parser for each fru record area and updates
	// Inventory
	//------------------------------------------------------------------------
	int ipmi_update_inventory(fru_area_vec_t& area_vec, sd_bus* bus_sd)
	{
	// Generic error reporter
	int rc = 0;
	uint8_t fruid = 0;
	IPMIFruInfo fruData;

	// For each FRU area, extract the needed data , get it parsed and update
	// the Inventory.
	for (const auto& fruArea : area_vec)
	{
	fruid = fruArea->get_fruid();
	// Fill the container with information
	rc = parse_fru_area((fruArea)->get_type(), (void*)(fruArea)->get_data(),
	(fruArea)->get_len(), fruData);
	if (rc < 0)
	{
	std::cerr << "ERROR parsing FRU records\n";
	return rc;
	}
	} // END walking the vector of areas and updating

	// For each Fru we have the list of instances which needs to be updated.
	// Each instance object implements certain interfaces.
	// Each Interface is having Dbus properties.
	// Each Dbus Property would be having metaData(eg section,VpdPropertyName).

	// Here we are just printing the object,interface and the properties.
	// which needs to be called with the new inventory manager implementation.
	sdbusplus::bus::bus bus{bus_sd};
	using namespace std::string_literals;
	static const auto intf = "xyz.openbmc_project.Inventory.Manager"s;
	static const auto path = "/xyz/openbmc_project/inventory"s;
	std::string service;
	try
	{
	service = getService(bus,intf,path);
	}
	catch (const std::runtime_error& e)
	{
	std::cerr << e.what() << "\n";
	return -1;
	}

	auto iter = frus.find(fruid);
	if (iter == frus.end())
	{
	std::cerr << "ERROR Unable to get the fru info for FRU="
	<< static_cast<int>(fruid) << "\n";
	return -1;
	}

	auto& instanceList = iter->second;
	if (instanceList.size() <= 0)
	{
	std::cout << "Object List empty for this FRU="
	<< static_cast<int>(fruid) << "\n";
	}

	ObjectMap objects;
	for (auto& instance : instanceList)
	{
	InterfaceMap interfaces;
	const auto& extrasIter = extras.find(instance.first);

	for (auto& interfaceList : instance.second)
	{
	PropertyMap props;//store all the properties
	for (auto& properties : interfaceList.second)
	{
	std::string section, property, delimiter, value;
	for (auto& info : properties.second)
	{
	if (info.first == "IPMIFruSection")
	{
	section = std::move(info.second);
	}
	if (info.first == "IPMIFruProperty")
	{
	property = std::move(info.second);
	}
	if (info.first == "IPMIFruValueDelimiter")
	{
	//Read the delimeter as ascii value
	//convert it into char
	if( info.second.length() > 0 )
	{
	char dlm = ' ';
	rc = sscanf(info.second.c_str(),"%hhd",&dlm);
	if (rc > 0)
	{
	delimiter = std::string(1,dlm);
	}
	}
	}

	}

	if (!section.empty() && !property.empty())
	{
	value = getFRUValue(section, property, delimiter, fruData);
	}
	props.emplace(std::move(properties.first), std::move(value));
	}
	// Check and update extra properties
	if(extras.end() != extrasIter)
	{
	const auto& propsIter =
	(extrasIter->second).find(interfaceList.first);
	if((extrasIter->second).end() != propsIter)
	{
	for(const auto& map : propsIter->second)
	{
	props.emplace(map.first, map.second);
	}
	}
	}
	interfaces.emplace(std::move(interfaceList.first),
	std::move(props));
	}

	// Call the inventory manager
	sdbusplus::message::object_path path = instance.first;
	// Check and update extra properties
	if(extras.end() != extrasIter)
	{
	for(const auto& entry : extrasIter->second)
	{
	if(interfaces.end() == interfaces.find(entry.first))
	{
	interfaces.emplace(entry.first, entry.second);
	}
	}
	}
	objects.emplace(path,interfaces);
	}

	auto pimMsg = bus.new_method_call(
	service.c_str(),
	path.c_str(),
	intf.c_str(),
	"Notify");
	pimMsg.append(std::move(objects));
	auto inventoryMgrResponseMsg = bus.call(pimMsg);
	if (inventoryMgrResponseMsg.is_method_error())
	{
	std::cerr << "Error in notify call\n";
	return -1;
	}
	return rc;
	}

	///----------------------------------------------------
	// Checks if a particular fru area is populated or not
	///----------------------------------------------------
	bool remove_invalid_area(const std::unique_ptr<ipmi_fru> &fru_area)
	{
	// Filter the ones that are empty
	if(!(fru_area->get_len()))
	{
	return true;
	}
	return false;
	}

	///----------------------------------------------------------------------------------
	// Populates various FRU areas
	// @prereq : This must be called only after validating common header.
	///----------------------------------------------------------------------------------
	int ipmi_populate_fru_areas(uint8_t *fru_data, const size_t data_len,
	fru_area_vec_t & fru_area_vec)
	{
	size_t area_offset = 0;
	int rc = -1;

	// Now walk the common header and see if the file size has atleast the last
	// offset mentioned by the common_hdr. If the file size is less than the
	// offset of any if the fru areas mentioned in the common header, then we do
	// not have a complete file.
	for(uint8_t fru_entry = IPMI_FRU_INTERNAL_OFFSET;
	fru_entry < (sizeof(struct common_header) -2); fru_entry++)
	{
	rc = -1;
	// Actual offset in the payload is the offset mentioned in common header
	// multipled by 8. Common header is always the first 8 bytes.
	area_offset = fru_data[fru_entry] * IPMI_EIGHT_BYTES;
	if(area_offset && (data_len < (area_offset + 2)))
	{
	// Our file size is less than what it needs to be. +2 because we are
	// using area len that is at 2 byte off area_offset
	fprintf(stderr, "fru file is incomplete. Size:[%zd]\n",data_len);
	return rc;
	}
	else if(area_offset)
	{
	// Read 2 bytes to know the actual size of area.
	uint8_t area_hdr[2] = {0};
	memcpy(area_hdr, &((uint8_t *)fru_data)[area_offset], sizeof(area_hdr));

	// Size of this area will be the 2nd byte in the fru area header.
	size_t area_len = area_hdr[1] * IPMI_EIGHT_BYTES;
	uint8_t area_data[area_len] = {0};

	printf("fru data size:[%zd], area offset:[%zd], area_size:[%zd]\n",
	data_len, area_offset, area_len);

	// See if we really have that much buffer. We have area offset amd
	// from there, the actual len.
	if(data_len < (area_len + area_offset))
	{
	fprintf(stderr, "Incomplete Fru file.. Size:[%zd]\n",data_len);
	return rc;
	}

	// Save off the data.
	memcpy(area_data, &((uint8_t *)fru_data)[area_offset], area_len);

	// Validate the crc
	rc = verify_fru_data(area_data, area_len);
	if(rc < 0)
	{
	fprintf(stderr, "Error validating fru area. offset:[%zd]\n",area_offset);
	return rc;
	}
	else
	{
	printf("Successfully verified area checksum. offset:[%zd]\n",area_offset);
	}

	// We already have a vector that is passed to us containing all
	// of the fields populated. Update the data portion now.
	for(auto& iter : fru_area_vec)
	{
	if((iter)->get_type() == get_fru_area_type(fru_entry))
	{
	(iter)->set_data(area_data, area_len);
	}
	}
	} // If we have fru data present
	} // Walk common_hdr

	// Not all the fields will be populated in a fru data. Mostly all cases will
	// not have more than 2 or 3.
	fru_area_vec.erase(std::remove_if(fru_area_vec.begin(), fru_area_vec.end(),
	remove_invalid_area), fru_area_vec.end());

	return EXIT_SUCCESS;
	}

	///---------------------------------------------------------
	// Validates the fru data per ipmi common header constructs.
	// Returns with updated common_hdr and also file_size
	//----------------------------------------------------------
	int ipmi_validate_common_hdr(const uint8_t *fru_data, const size_t data_len)
	{
	int rc = -1;

	uint8_t common_hdr[sizeof(struct common_header)] = {0};
	if(data_len >= sizeof(common_hdr))
	{
	memcpy(common_hdr, fru_data, sizeof(common_hdr));
	}
	else
	{
	fprintf(stderr, "Incomplete fru data file. Size:[%zd]\n", data_len);
	return rc;
	}

	// Verify the crc and size
	rc = verify_fru_data(common_hdr, sizeof(common_hdr));
	if(rc < 0)
	{
	fprintf(stderr, "Failed to validate common header\n");
	return rc;
	}

	return EXIT_SUCCESS;
	}

	//------------------------------------------------------------
	// Cleanup routine
	//------------------------------------------------------------
	int cleanup_error(FILE *fru_fp, fru_area_vec_t & fru_area_vec)
	{
	if(fru_fp != NULL)
	{
	fclose(fru_fp);
	fru_fp = NULL;
	}

	if(!(fru_area_vec.empty()))
	{
	fru_area_vec.clear();
	}

	return -1;
	}

	///-----------------------------------------------------
	// Accepts the filename and validates per IPMI FRU spec
	//----------------------------------------------------
	int ipmi_validate_fru_area(const uint8_t fruid, const char *fru_file_name,
	sd_bus *bus_type, const bool bmc_fru)
	{
	size_t data_len = 0;
	size_t bytes_read = 0;
	int rc = -1;

	// Vector that holds individual IPMI FRU AREAs. Although MULTI and INTERNAL
	// are not used, keeping it here for completeness.
	fru_area_vec_t fru_area_vec;
	std::vector<std::string> defined_fru_area;

	for(uint8_t fru_entry = IPMI_FRU_INTERNAL_OFFSET;
	fru_entry < (sizeof(struct common_header) -2); fru_entry++)
	{
	// Create an object and push onto a vector.
	std::unique_ptr<ipmi_fru> fru_area = std::make_unique<ipmi_fru>
	(fruid, get_fru_area_type(fru_entry), bus_type, bmc_fru);

	// Physically being present
	bool present = access(fru_file_name, F_OK) == 0;
	fru_area->set_present(present);

	fru_area_vec.emplace_back(std::move(fru_area));
	}

	FILE *fru_fp = fopen(fru_file_name,"rb");
	if(fru_fp == NULL)
	{
	fprintf(stderr, "ERROR: opening:[%s]\n",fru_file_name);
	perror("Error:");
	return cleanup_error(fru_fp, fru_area_vec);
	}

	// Get the size of the file to see if it meets minimum requirement
	if(fseek(fru_fp, 0, SEEK_END))
	{
	perror("Error:");
	return cleanup_error(fru_fp, fru_area_vec);
	}

	// Allocate a buffer to hold entire file content
	data_len = ftell(fru_fp);
	uint8_t fru_data[data_len] = {0};

	rewind(fru_fp);
	bytes_read = fread(fru_data, data_len, 1, fru_fp);
	if(bytes_read != 1)
	{
	fprintf(stderr, "Failed reading fru data. Bytes_read=[%zd]\n",bytes_read);
	perror("Error:");
	return cleanup_error(fru_fp, fru_area_vec);
	}

	// We are done reading.
	fclose(fru_fp);
	fru_fp = NULL;

	rc = ipmi_validate_common_hdr(fru_data, data_len);
	if(rc < 0)
	{
	return cleanup_error(fru_fp, fru_area_vec);
	}

	// Now that we validated the common header, populate various fru sections if we have them here.
	rc = ipmi_populate_fru_areas(fru_data, data_len, fru_area_vec);
	if(rc < 0)
	{
	fprintf(stderr,"Populating FRU areas failed for:[%d]\n",fruid);
	return cleanup_error(fru_fp, fru_area_vec);
	}
	else
	{
	printf("SUCCESS: Populated FRU areas for:[%s]\n",fru_file_name);
	}

	#ifdef __IPMI_DEBUG__
	for(auto& iter : fru_area_vec)
	{
	printf("FRU ID : [%d]\n",(iter)->get_fruid());
	printf("AREA NAME : [%s]\n",(iter)->get_name());
	printf("TYPE : [%d]\n",(iter)->get_type());
	printf("LEN : [%d]\n",(iter)->get_len());
	printf("BUS NAME : [%s]\n", (iter)->get_bus_name());
	printf("OBJ PATH : [%s]\n", (iter)->get_obj_path());
	printf("INTF NAME :[%s]\n", (iter)->get_intf_name());
	}
	#endif

	// If the vector is populated with everything, then go ahead and update the
	// inventory.
	if(!(fru_area_vec.empty()))
	{

	#ifdef __IPMI_DEBUG__
	printf("\n SIZE of vector is : [%d] \n",fru_area_vec.size());
	#endif
	rc = ipmi_update_inventory(fru_area_vec, bus_type);
	if(rc <0)
	{
	fprintf(stderr, "Error updating inventory\n");
	}
	}

	// we are done with all that we wanted to do. This will do the job of
	// calling any destructors too.
	fru_area_vec.clear();

	return rc;
	}