Donetsk/hook_lib/common/utils/smbios.cpp

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2023-10-09 11:54:34 -04:00
#include "smbios.hpp"
#include "memory.hpp"
#define WIN32_LEAN_AND_MEAN
#include <Windows.h>
#include <intrin.h>
namespace utils::smbios
{
namespace
{
#pragma warning(push)
#pragma warning(disable: 4200)
struct RawSMBIOSData
{
BYTE Used20CallingMethod;
BYTE SMBIOSMajorVersion;
BYTE SMBIOSMinorVersion;
BYTE DmiRevision;
DWORD Length;
BYTE SMBIOSTableData[];
};
typedef struct
{
BYTE type;
BYTE length;
WORD handle;
} dmi_header;
#pragma warning(pop)
std::vector<uint8_t> get_smbios_data()
{
DWORD size = 0;
std::vector<uint8_t> data{};
size = GetSystemFirmwareTable('RSMB', 0, nullptr, size);
data.resize(size);
GetSystemFirmwareTable('RSMB', 0, data.data(), size);
return data;
}
std::string parse_uuid(const uint8_t* data)
{
if (utils::memory::is_set(data, 0, 16) || utils::memory::is_set(data, -1, 16))
{
return {};
}
char uuid[16] = {0};
*reinterpret_cast<unsigned long*>(uuid + 0) =
_byteswap_ulong(*reinterpret_cast<const unsigned long*>(data + 0));
*reinterpret_cast<unsigned short*>(uuid + 4) =
_byteswap_ushort(*reinterpret_cast<const unsigned short*>(data + 4));
*reinterpret_cast<unsigned short*>(uuid + 6) =
_byteswap_ushort(*reinterpret_cast<const unsigned short*>(data + 6));
memcpy(uuid + 8, data + 8, 8);
return std::string(uuid, sizeof(uuid));
}
}
std::string get_uuid()
{
auto smbios_data = get_smbios_data();
auto* raw_data = reinterpret_cast<RawSMBIOSData*>(smbios_data.data());
auto* data = raw_data->SMBIOSTableData;
for (DWORD i = 0; i + sizeof(dmi_header) < raw_data->Length;)
{
auto* header = reinterpret_cast<dmi_header*>(data + i);
if (header->length < 4)
{
return {};
}
if (header->type == 0x01 && header->length >= 0x19)
{
return parse_uuid(data + i + 0x8);
}
i += header->length;
while ((i + 1) < raw_data->Length && *reinterpret_cast<uint16_t*>(data + i) != 0)
{
++i;
}
i += 2;
}
return {};
}
}