73 lines
2.4 KiB
C++
73 lines
2.4 KiB
C++
#include "Common/WindowsRegistry.h"
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#include <Windows.h>
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#include <string>
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#include <type_traits>
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#include "Common/StringUtil.h"
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namespace WindowsRegistry
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{
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template <typename T>
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bool ReadValue(T* value, const std::string& subkey, const std::string& name)
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{
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DWORD flags = 0;
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static_assert(std::is_integral_v<T> && (sizeof(T) == sizeof(u32) || sizeof(T) == sizeof(u64)),
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"Unsupported type");
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if constexpr (sizeof(T) == sizeof(u32))
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flags = RRF_RT_REG_DWORD;
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else if constexpr (sizeof(T) == sizeof(u64))
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flags = RRF_RT_REG_QWORD;
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DWORD value_len = sizeof(*value);
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return RegGetValueA(HKEY_LOCAL_MACHINE, subkey.c_str(), name.c_str(), flags, nullptr, value,
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&value_len) == ERROR_SUCCESS;
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}
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template <>
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bool ReadValue(std::string* value, const std::string& subkey, const std::string& name)
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{
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const DWORD flags = RRF_RT_REG_SZ | RRF_NOEXPAND;
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DWORD value_len = 0;
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auto status = RegGetValueA(HKEY_LOCAL_MACHINE, subkey.c_str(), name.c_str(), flags, nullptr,
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nullptr, &value_len);
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if (status != ERROR_SUCCESS && status != ERROR_MORE_DATA)
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return false;
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value->resize(value_len);
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status = RegGetValueA(HKEY_LOCAL_MACHINE, subkey.c_str(), name.c_str(), flags, nullptr,
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value->data(), &value_len);
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if (status != ERROR_SUCCESS)
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{
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value->clear();
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return false;
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}
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TruncateToCString(value);
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return true;
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}
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OSVERSIONINFOW GetOSVersion()
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{
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// PEB may have faked data if the binary is launched with "compatibility mode" enabled.
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// Try to read real OS version from registry.
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const char* subkey = R"(SOFTWARE\Microsoft\Windows NT\CurrentVersion)";
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OSVERSIONINFOW info{.dwOSVersionInfoSize = sizeof(info)};
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std::string build_str;
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if (!ReadValue(&info.dwMajorVersion, subkey, "CurrentMajorVersionNumber") ||
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!ReadValue(&info.dwMinorVersion, subkey, "CurrentMinorVersionNumber") ||
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!ReadValue(&build_str, subkey, "CurrentBuildNumber") ||
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!TryParse(build_str, &info.dwBuildNumber))
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{
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// Fallback to version from PEB
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typedef DWORD(WINAPI * RtlGetVersion_t)(PRTL_OSVERSIONINFOW);
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auto RtlGetVersion =
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(RtlGetVersion_t)GetProcAddress(GetModuleHandle(TEXT("ntdll")), "RtlGetVersion");
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RtlGetVersion(&info);
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// Clear fields which would not be filled in by registry query
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info.dwPlatformId = 0;
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info.szCSDVersion[0] = L'\0';
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}
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return info;
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}
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}; // namespace WindowsRegistry
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