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#include "apphandler.h"
#include "app/channel.hpp"
#include "app/watchdog.hpp"
#include "host-ipmid/ipmid-api.h"
#include "ipmid.hpp"
#include "nlohmann/json.hpp"
#include "types.hpp"
#include "utils.hpp"

#if __has_include(<filesystem>)
#include <filesystem>
#elif __has_include(<experimental/filesystem>)
#include <experimental/filesystem>
namespace std {
  // splice experimental::filesystem into std
  namespace filesystem = std::experimental::filesystem;
}
#else
#  error filesystem not available
#endif
#include <fstream>
#include <stdio.h>
#include <stdint.h>
#include <systemd/sd-bus.h>
#include <mapper.h>
#include <array>
#include <vector>
#include <string>
#include <cstddef>

#include <arpa/inet.h>
#include "transporthandler.hpp"

#include <phosphor-logging/log.hpp>
#include <phosphor-logging/elog-errors.hpp>
#include "xyz/openbmc_project/Common/error.hpp"
#include "xyz/openbmc_project/Software/Version/server.hpp"
#include "xyz/openbmc_project/Software/Activation/server.hpp"

extern sd_bus *bus;

constexpr auto bmc_interface = "xyz.openbmc_project.Inventory.Item.Bmc";
constexpr auto bmc_guid_interface = "xyz.openbmc_project.Common.UUID";
constexpr auto bmc_guid_property = "UUID";
constexpr auto bmc_guid_len = 16;

static constexpr auto redundancyIntf =
    "xyz.openbmc_project.Software.RedundancyPriority";
static constexpr auto versionIntf =
    "xyz.openbmc_project.Software.Version";
static constexpr auto activationIntf =
    "xyz.openbmc_project.Software.Activation";
static constexpr auto softwareRoot = "/xyz/openbmc_project/software";

void register_netfn_app_functions() __attribute__((constructor));

using namespace phosphor::logging;
using namespace sdbusplus::xyz::openbmc_project::Common::Error;
using Version = sdbusplus::xyz::openbmc_project::Software::server::Version;
using Activation =
    sdbusplus::xyz::openbmc_project::Software::server::Activation;
namespace fs = std::filesystem;

// Offset in get device id command.
typedef struct
{
   uint8_t id;
   uint8_t revision;
   uint8_t fw[2];
   uint8_t ipmi_ver;
   uint8_t addn_dev_support;
   uint8_t manuf_id[3];
   uint8_t prod_id[2];
   uint8_t aux[4];
}__attribute__((packed)) ipmi_device_id_t;

/**
 * @brief Returns the Version info from primary s/w object
 *
 * Get the Version info from the active s/w object which is having high
 * "Priority" value(a smaller number is a higher priority) and "Purpose"
 * is "BMC" from the list of all s/w objects those are implementing
 * RedundancyPriority interface from the given softwareRoot path.
 *
 * @return On success returns the Version info from primary s/w object.
 *
 */
std::string getActiveSoftwareVersionInfo()
{
    sdbusplus::bus::bus bus{ipmid_get_sd_bus_connection()};

    std::string revision{};
    auto objectTree = ipmi::getAllDbusObjects(bus, softwareRoot, redundancyIntf,
                                              "");
    if (objectTree.empty())
    {
        log<level::ERR>("No Obj has implemented the s/w redundancy interface",
                        entry("INTERFACE=%s", redundancyIntf));
        elog<InternalFailure>();
    }

    auto objectFound = false;
    for (auto& softObject : objectTree)
    {
        auto service = ipmi::getService(bus, redundancyIntf, softObject.first);
        auto objValueTree = ipmi::getManagedObjects(bus, service, softwareRoot);

        auto minPriority = 0xFF;
        for (const auto& objIter : objValueTree)
        {
            try
            {
                auto& intfMap = objIter.second;
                auto& redundancyPriorityProps = intfMap.at(redundancyIntf);
                auto& versionProps = intfMap.at(versionIntf);
                auto& activationProps = intfMap.at(activationIntf);
                auto priority =
                    redundancyPriorityProps.at("Priority").get<uint8_t>();
                auto purpose = versionProps.at("Purpose").get<std::string>();
                auto activation =
                    activationProps.at("Activation").get<std::string>();
                auto version = versionProps.at("Version").get<std::string>();
                if ((Version::convertVersionPurposeFromString(purpose) ==
                     Version::VersionPurpose::BMC) &&
                    (Activation::convertActivationsFromString(activation) ==
                     Activation::Activations::Active))
                {
                    if (priority < minPriority)
                    {
                        minPriority = priority;
                        objectFound = true;
                        revision = std::move(version);
                    }
                }
            }
            catch (const std::exception& e)
            {
                log<level::ERR>(e.what());
            }
        }
    }

    if (!objectFound)
    {
        log<level::ERR>("Could not found an BMC software Object");
        elog<InternalFailure>();
    }

    return revision;
}


ipmi_ret_t ipmi_app_set_acpi_power_state(ipmi_netfn_t netfn, ipmi_cmd_t cmd,
                             ipmi_request_t request, ipmi_response_t response,
                             ipmi_data_len_t data_len, ipmi_context_t context)
{
    ipmi_ret_t rc = IPMI_CC_OK;
    *data_len = 0;

    log<level::DEBUG>("IPMI SET ACPI STATE Ignoring for now\n");
    return rc;
}

typedef struct
{
    char major;
    char minor;
    uint16_t d[2];
} rev_t;

/* Currently supports the vx.x-x-[-x] and v1.x.x-x-[-x] format. It will     */
/* return -1 if not in those formats, this routine knows how to parse       */
/* version = v0.6-19-gf363f61-dirty                                         */
/*            ^ ^ ^^          ^                                             */
/*            | |  |----------|-- additional details                        */
/*            | |---------------- Minor                                     */
/*            |------------------ Major                                     */
/* and version = v1.99.10-113-g65edf7d-r3-0-g9e4f715                        */
/*                ^ ^  ^^ ^                                                 */
/*                | |  |--|---------- additional details                    */
/*                | |---------------- Minor                                 */
/*                |------------------ Major                                 */
/* Additional details : If the option group exists it will force Auxiliary  */
/* Firmware Revision Information 4th byte to 1 indicating the build was     */
/* derived with additional edits                                            */
int convert_version(const char * p, rev_t *rev)
{
    std::string s(p);
    std::string token;
    uint16_t commits;

    auto location  = s.find_first_of('v');
    if (location != std::string::npos)
    {
        s = s.substr(location+1);
    }

    if (!s.empty())
    {
        location = s.find_first_of(".");
        if (location != std::string::npos)
        {
            rev->major = static_cast<char>(
                    std::stoi(s.substr(0, location), 0, 16));
            token = s.substr(location+1);
        }

        if (!token.empty())
        {
            location = token.find_first_of(".-");
            if (location != std::string::npos)
            {
                rev->minor = static_cast<char>(
                        std::stoi(token.substr(0, location), 0, 16));
                token = token.substr(location+1);
            }
        }

        // Capture the number of commits on top of the minor tag.
        // I'm using BE format like the ipmi spec asked for
        location = token.find_first_of(".-");
        if (!token.empty())
        {
            commits = std::stoi(token.substr(0, location), 0, 16);
            rev->d[0] = (commits>>8) | (commits<<8);

            // commit number we skip
            location = token.find_first_of(".-");
            if (location != std::string::npos)
            {
                token = token.substr(location+1);
            }
        }
        else {
            rev->d[0] = 0;
        }

        if (location != std::string::npos)
        {
            token = token.substr(location+1);
        }

        // Any value of the optional parameter forces it to 1
        location = token.find_first_of(".-");
        if (location != std::string::npos)
        {
            token = token.substr(location+1);
        }
        commits = (!token.empty()) ? 1 : 0;

        //We do this operation to get this displayed in least significant bytes
        //of ipmitool device id command.
        rev->d[1] = (commits>>8) | (commits<<8);
    }

    return 0;
}

ipmi_ret_t ipmi_app_get_device_id(ipmi_netfn_t netfn, ipmi_cmd_t cmd,
                             ipmi_request_t request, ipmi_response_t response,
                             ipmi_data_len_t data_len, ipmi_context_t context)
{
    ipmi_ret_t rc = IPMI_CC_OK;
    int r = -1;
    rev_t rev = {0};
    static ipmi_device_id_t dev_id{};
    static bool dev_id_initialized = false;
    const char* filename = "/usr/share/ipmi-providers/dev_id.json";

    // Data length
    *data_len = sizeof(dev_id);

    if (!dev_id_initialized)
    {
        try
        {
            auto version = getActiveSoftwareVersionInfo();
            r = convert_version(version.c_str(), &rev);
        }
        catch (const std::exception& e)
        {
            log<level::ERR>(e.what());
        }

        if( r >= 0 ) {
            // bit7 identifies if the device is available
            // 0=normal operation
            // 1=device firmware, SDR update,
            // or self-initialization in progress.
            // our SDR is normal working condition, so mask:
            dev_id.fw[0] = 0x7F & rev.major;

            rev.minor = (rev.minor > 99 ? 99 : rev.minor);
            dev_id.fw[1] = rev.minor % 10 + (rev.minor / 10) * 16;
            memcpy(&dev_id.aux, rev.d, 4);
        }

        // IPMI Spec version 2.0
        dev_id.ipmi_ver = 2;

        std::ifstream dev_id_file(filename);
        if (dev_id_file.is_open())
        {
            auto data = nlohmann::json::parse(dev_id_file, nullptr, false);
            if (!data.is_discarded())
            {
                dev_id.id = data.value("id", 0);
                dev_id.revision = data.value("revision", 0);
                dev_id.addn_dev_support = data.value("addn_dev_support", 0);
                dev_id.manuf_id[2] = data.value("manuf_id", 0) >> 16;
                dev_id.manuf_id[1] = data.value("manuf_id", 0) >> 8;
                dev_id.manuf_id[0] = data.value("manuf_id", 0);
                dev_id.prod_id[1] = data.value("prod_id", 0) >> 8;
                dev_id.prod_id[0] = data.value("prod_id", 0);
                dev_id.aux[3] = data.value("aux", 0);
                dev_id.aux[2] = data.value("aux", 0) >> 8;
                dev_id.aux[1] = data.value("aux", 0) >> 16;
                dev_id.aux[0] = data.value("aux", 0) >> 24;

                //Don't read the file every time if successful
                dev_id_initialized = true;
            }
            else
            {
                log<level::ERR>("Device ID JSON parser failure");
                rc = IPMI_CC_UNSPECIFIED_ERROR;
            }
        }
        else
        {
            log<level::ERR>("Device ID file not found");
            rc = IPMI_CC_UNSPECIFIED_ERROR;
        }
    }

    // Pack the actual response
    memcpy(response, &dev_id, *data_len);

    return rc;
}

ipmi_ret_t ipmi_app_get_self_test_results(ipmi_netfn_t netfn, ipmi_cmd_t cmd,
                             ipmi_request_t request, ipmi_response_t response,
                             ipmi_data_len_t data_len, ipmi_context_t context)
{
    ipmi_ret_t rc = IPMI_CC_OK;

    // Byte 2:
    //  55h - No error.
    //  56h - Self Test function not implemented in this controller.
    //  57h - Corrupted or inaccesssible data or devices.
    //  58h - Fatal hardware error.
    //  FFh - reserved.
    //  all other: Device-specific 'internal failure'.
    //  Byte 3:
    //      For byte 2 = 55h, 56h, FFh:     00h
    //      For byte 2 = 58h, all other:    Device-specific
    //      For byte 2 = 57h:   self-test error bitfield.
    //      Note: returning 57h does not imply that all test were run.
    //      [7] 1b = Cannot access SEL device.
    //      [6] 1b = Cannot access SDR Repository.
    //      [5] 1b = Cannot access BMC FRU device.
    //      [4] 1b = IPMB signal lines do not respond.
    //      [3] 1b = SDR Repository empty.
    //      [2] 1b = Internal Use Area of BMC FRU corrupted.
    //      [1] 1b = controller update 'boot block' firmware corrupted.
    //      [0] 1b = controller operational firmware corrupted.

    char selftestresults[2] = {0};

    *data_len = 2;

    selftestresults[0] = 0x56;
    selftestresults[1] = 0;

    memcpy(response, selftestresults, *data_len);

    return rc;
}

ipmi_ret_t ipmi_app_get_device_guid(ipmi_netfn_t netfn, ipmi_cmd_t cmd,
                             ipmi_request_t request, ipmi_response_t response,
                             ipmi_data_len_t data_len, ipmi_context_t context)
{
    const char  *objname = "/org/openbmc/control/chassis0";
    const char  *iface = "org.freedesktop.DBus.Properties";
    const char  *chassis_iface = "org.openbmc.control.Chassis";
    sd_bus_message *reply = NULL;
    sd_bus_error error = SD_BUS_ERROR_NULL;
    int r = 0;
    char *uuid = NULL;
    char *busname = NULL;

    // UUID is in RFC4122 format. Ex: 61a39523-78f2-11e5-9862-e6402cfc3223
    // Per IPMI Spec 2.0 need to convert to 16 hex bytes and reverse the byte
    // order
    // Ex: 0x2332fc2c40e66298e511f2782395a361

    const int resp_size = 16; // Response is 16 hex bytes per IPMI Spec
    uint8_t resp_uuid[resp_size]; // Array to hold the formatted response
    // Point resp end of array to save in reverse order
    int resp_loc = resp_size-1;
    int i = 0;
    char *tokptr = NULL;
    char *id_octet = NULL;

    // Status code.
    ipmi_ret_t rc = IPMI_CC_OK;
    *data_len = 0;

    // Call Get properties method with the interface and property name
    r = mapper_get_service(bus, objname, &busname);
    if (r < 0) {
        log<level::ERR>("Failed to get bus name",
                        entry("BUS=%s", objname),
                        entry("ERRNO=0x%X", -r));
        goto finish;
    }
    r = sd_bus_call_method(bus,busname,objname,iface,
                           "Get",&error, &reply, "ss",
                           chassis_iface, "uuid");
    if (r < 0)
    {
        log<level::ERR>("Failed to call Get Method",
                        entry("ERRNO=0x%X", -r));
        rc = IPMI_CC_UNSPECIFIED_ERROR;
        goto finish;
    }

    r = sd_bus_message_read(reply, "v", "s", &uuid);
    if (r < 0 || uuid == NULL)
    {
        log<level::ERR>("Failed to get a response",
                        entry("ERRNO=0x%X", -r));
        rc = IPMI_CC_RESPONSE_ERROR;
        goto finish;
    }

    // Traverse the UUID
    // Get the UUID octects separated by dash
    id_octet = strtok_r(uuid, "-", &tokptr);

    if (id_octet == NULL)
    {
        // Error
        log<level::ERR>("Unexpected UUID format",
                        entry("UUID=%s", uuid));
        rc = IPMI_CC_RESPONSE_ERROR;
        goto finish;
    }

    while (id_octet != NULL)
    {
        // Calculate the octet string size since it varies
        // Divide it by 2 for the array size since 1 byte is built from 2 chars
        int tmp_size = strlen(id_octet)/2;

        for(i = 0; i < tmp_size; i++)
        {
            // Holder of the 2 chars that will become a byte
            char tmp_array[3] = {0};
            strncpy(tmp_array, id_octet, 2); // 2 chars at a time

            int resp_byte = strtoul(tmp_array, NULL, 16); // Convert to hex byte
            // Copy end to first
            memcpy((void*)&resp_uuid[resp_loc], &resp_byte, 1);
            resp_loc--;
            id_octet+=2; // Finished with the 2 chars, advance
        }
        id_octet=strtok_r(NULL, "-", &tokptr); // Get next octet
    }

    // Data length
    *data_len = resp_size;

    // Pack the actual response
    memcpy(response, &resp_uuid, *data_len);

finish:
    sd_bus_error_free(&error);
    reply = sd_bus_message_unref(reply);
    free(busname);

    return rc;
}

ipmi_ret_t ipmi_app_get_bt_capabilities(ipmi_netfn_t netfn, ipmi_cmd_t cmd,
                             ipmi_request_t request, ipmi_response_t response,
                             ipmi_data_len_t data_len, ipmi_context_t context)
{

    // Status code.
    ipmi_ret_t rc = IPMI_CC_OK;

    // Per IPMI 2.0 spec, the input and output buffer size must be the max
    // buffer size minus one byte to allocate space for the length byte.
    uint8_t str[] = {0x01, MAX_IPMI_BUFFER-1, MAX_IPMI_BUFFER-1, 0x0A, 0x01};

    // Data length
    *data_len = sizeof(str);

    // Pack the actual response
    memcpy(response, &str, *data_len);

    return rc;
}

ipmi_ret_t ipmi_app_wildcard_handler(ipmi_netfn_t netfn, ipmi_cmd_t cmd,
                              ipmi_request_t request, ipmi_response_t response,
                              ipmi_data_len_t data_len, ipmi_context_t context)
{
    // Status code.
    ipmi_ret_t rc = IPMI_CC_INVALID;

    *data_len = strlen("THIS IS WILDCARD");

    // Now pack actual response
    memcpy(response, "THIS IS WILDCARD", *data_len);

    return rc;
}

ipmi_ret_t ipmi_app_get_sys_guid(ipmi_netfn_t netfn, ipmi_cmd_t cmd,
                             ipmi_request_t request, ipmi_response_t response,
                             ipmi_data_len_t data_len, ipmi_context_t context)

{
    ipmi_ret_t rc = IPMI_CC_OK;
    sdbusplus::bus::bus bus{ipmid_get_sd_bus_connection()};

    try
    {
        // Get the Inventory object implementing BMC interface
        ipmi::DbusObjectInfo bmcObject =
            ipmi::getDbusObject(bus, bmc_interface);

        // Read UUID property value from bmcObject
        // UUID is in RFC4122 format Ex: 61a39523-78f2-11e5-9862-e6402cfc3223
        auto variant = ipmi::getDbusProperty(
                bus, bmcObject.second, bmcObject.first, bmc_guid_interface,
                bmc_guid_property);
        std::string guidProp = variant.get<std::string>();

        // Erase "-" characters from the property value
        guidProp.erase(std::remove(guidProp.begin(), guidProp.end(), '-'),
                guidProp.end());

        auto guidPropLen = guidProp.length();
        // Validate UUID data
        // Divide by 2 as 1 byte is built from 2 chars
        if ( (guidPropLen <=0) || ((guidPropLen/2) != bmc_guid_len) )

        {
            log<level::ERR>("Invalid UUID property value",
                    entry("UUID_LENGTH=%d", guidPropLen));
            return IPMI_CC_RESPONSE_ERROR;
        }

        // Convert data in RFC4122(MSB) format to LSB format
        // Get 2 characters at a time as 1 byte is built from 2 chars and
        // convert to hex byte
        // TODO: Data printed for GUID command is not as per the
        // GUID format defined in IPMI specification 2.0 section 20.8
        // Ticket raised: https://sourceforge.net/p/ipmitool/bugs/501/
        uint8_t respGuid[bmc_guid_len];
        for (size_t i = 0, respLoc = (bmc_guid_len - 1);
            i < guidPropLen && respLoc >= 0; i += 2, respLoc--)
        {
            auto value = static_cast<uint8_t>(
                    std::stoi(guidProp.substr(i, 2).c_str(), NULL, 16));
            respGuid[respLoc] = value;
        }

        *data_len = bmc_guid_len;
        memcpy(response, &respGuid, bmc_guid_len);
    }
    catch (const InternalFailure& e)
    {
        log<level::ERR>("Failed in reading BMC UUID property",
                        entry("INTERFACE=%s", bmc_interface),
                        entry("PROPERTY_INTERFACE=%s", bmc_guid_interface),
                        entry("PROPERTY=%s", bmc_guid_property));
        return IPMI_CC_UNSPECIFIED_ERROR;
    }
    return rc;
}

void register_netfn_app_functions()
{
    // <Get BT Interface Capabilities>
    ipmi_register_callback(NETFUN_APP,
                           IPMI_CMD_GET_CAP_BIT,
                           NULL,
                           ipmi_app_get_bt_capabilities,
                           PRIVILEGE_USER);

    // <Wildcard Command>
    ipmi_register_callback(NETFUN_APP,
                           IPMI_CMD_WILDCARD,
                           NULL,
                           ipmi_app_wildcard_handler,
                           PRIVILEGE_USER);

    // <Reset Watchdog Timer>
    ipmi_register_callback(NETFUN_APP,
                           IPMI_CMD_RESET_WD,
                           NULL,
                           ipmi_app_watchdog_reset,
                           PRIVILEGE_OPERATOR);

    // <Set Watchdog Timer>
    ipmi_register_callback(NETFUN_APP,
                           IPMI_CMD_SET_WD,
                           NULL,
                           ipmi_app_watchdog_set,
                           PRIVILEGE_OPERATOR);

    // <Get Watchdog Timer>
    ipmi_register_callback(NETFUN_APP,
                           IPMI_CMD_GET_WD,
                           NULL,
                           ipmi_app_watchdog_get,
                           PRIVILEGE_OPERATOR);

    // <Get Device ID>
    ipmi_register_callback(NETFUN_APP,
                           IPMI_CMD_GET_DEVICE_ID,
                           NULL,
                           ipmi_app_get_device_id,
                           PRIVILEGE_USER);

    // <Get Self Test Results>
    ipmi_register_callback(NETFUN_APP,
                           IPMI_CMD_GET_SELF_TEST_RESULTS,
                           NULL,
                           ipmi_app_get_self_test_results,
                           PRIVILEGE_USER);

    // <Get Device GUID>
    ipmi_register_callback(NETFUN_APP,
                           IPMI_CMD_GET_DEVICE_GUID,
                           NULL,
                           ipmi_app_get_device_guid,
                           PRIVILEGE_USER);

    // <Set ACPI Power State>
    ipmi_register_callback(NETFUN_APP,
                           IPMI_CMD_SET_ACPI,
                           NULL,
                           ipmi_app_set_acpi_power_state,
                           PRIVILEGE_ADMIN);

    // <Get Channel Access>
    ipmi_register_callback(NETFUN_APP,
                           IPMI_CMD_GET_CHANNEL_ACCESS,
                           NULL,
                           ipmi_get_channel_access,
                           PRIVILEGE_USER);

    // <Get Channel Info Command>
    ipmi_register_callback(NETFUN_APP,
                           IPMI_CMD_GET_CHAN_INFO,
                           NULL,
                           ipmi_app_channel_info,
                           PRIVILEGE_USER);

    // <Get System GUID Command>
    ipmi_register_callback(NETFUN_APP,
                           IPMI_CMD_GET_SYS_GUID,
                           NULL,
                           ipmi_app_get_sys_guid,
                           PRIVILEGE_USER);

    // <Get Channel Cipher Suites Command>
    ipmi_register_callback(NETFUN_APP,
                           IPMI_CMD_GET_CHAN_CIPHER_SUITES,
                           NULL,
                           getChannelCipherSuites,
                           PRIVILEGE_CALLBACK);
    return;
}

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