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/* SPDX-License-Identifier: GPL-2.0
*
* Copyright (C) 2018-2020 WireGuard LLC. All Rights Reserved.
*/
#include "pch.h"
/**
* Locates RT_RCDATA resource memory address and size.
*
* ResourceName Name of the RT_RCDATA resource. Use MAKEINTRESOURCEW to locate resource by ID.
*
* Address Pointer to a pointer variable to receive resource address.
*
* Size Pointer to a variable to receive resource size.
*
* @return ERROR_SUCCESS on success; Win32 error code otherwise.
*/
WINTUN_STATUS
ResourceGetAddress(_In_z_ const WCHAR *ResourceName, _Out_ const VOID **Address, _Out_ DWORD *Size)
{
HRSRC FoundResource = FindResourceW(ResourceModule, ResourceName, RT_RCDATA);
if (!FoundResource)
return LOG_LAST_ERROR(L"Failed to find resource");
*Size = SizeofResource(ResourceModule, FoundResource);
if (!*Size)
return LOG_LAST_ERROR(L"Failed to size resource");
HGLOBAL LoadedResource = LoadResource(ResourceModule, FoundResource);
if (!LoadedResource)
return LOG_LAST_ERROR(L"Failed to load resource");
*Address = LockResource(LoadedResource);
if (!*Address)
{
LOG(WINTUN_LOG_ERR, L"Failed to lock resource");
return ERROR_LOCK_FAILED;
}
return ERROR_SUCCESS;
}
/**
* Copies resource to a file.
*
* DestinationPath File path
*
* SecurityAttributes File security attributes. May be NULL for detault.
*
* ResourceName Name of the RT_RCDATA resource. Use MAKEINTRESOURCEW to locate resource by ID.
*
* @return ERROR_SUCCESS on success; Win32 error code otherwise.
*/
WINTUN_STATUS
ResourceCopyToFile(
_In_z_ const WCHAR *DestinationPath,
_In_opt_ SECURITY_ATTRIBUTES *SecurityAttributes,
_In_z_ const WCHAR *ResourceName)
{
const VOID *LockedResource;
DWORD SizeResource;
DWORD Result = ResourceGetAddress(ResourceName, &LockedResource, &SizeResource);
if (Result != ERROR_SUCCESS)
return LOG_ERROR("Failed to locate resource", Result);
HANDLE DestinationHandle = CreateFileW(
DestinationPath,
GENERIC_WRITE,
0,
SecurityAttributes,
CREATE_NEW,
FILE_ATTRIBUTE_NORMAL | FILE_ATTRIBUTE_TEMPORARY,
NULL);
if (DestinationHandle == INVALID_HANDLE_VALUE)
return LOG_LAST_ERROR(L"Failed to create file");
DWORD BytesWritten;
if (!WriteFile(DestinationHandle, LockedResource, SizeResource, &BytesWritten, NULL))
Result = LOG_LAST_ERROR(L"Failed to write file");
if (BytesWritten != SizeResource)
{
LOG(WINTUN_LOG_ERR, L"Incomplete write");
Result = Result != ERROR_SUCCESS ? Result : ERROR_WRITE_FAULT;
}
CloseHandle(DestinationHandle);
return Result;
}
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