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/* SPDX-License-Identifier: GPL-2.0
*
* Copyright (C) 2018-2021 WireGuard LLC. All Rights Reserved.
*/
#include "entry.h"
#include "logger.h"
#include "resource.h"
#include <Windows.h>
_Return_type_success_(return != NULL) _Ret_bytecount_(*Size) const
void *ResourceGetAddress(_In_z_ const WCHAR *ResourceName, _Out_ DWORD *Size)
{
HRSRC FoundResource = FindResourceW(ResourceModule, ResourceName, RT_RCDATA);
if (!FoundResource)
{
LOG_LAST_ERROR(L"Failed to find resource %s", ResourceName);
return NULL;
}
*Size = SizeofResource(ResourceModule, FoundResource);
if (!*Size)
{
LOG_LAST_ERROR(L"Failed to query resource %s size", ResourceName);
return NULL;
}
HGLOBAL LoadedResource = LoadResource(ResourceModule, FoundResource);
if (!LoadedResource)
{
LOG_LAST_ERROR(L"Failed to load resource %s", ResourceName);
return NULL;
}
BYTE *Address = LockResource(LoadedResource);
if (!Address)
{
LOG(WINTUN_LOG_ERR, L"Failed to lock resource %s", ResourceName);
SetLastError(ERROR_LOCK_FAILED);
return NULL;
}
return Address;
}
_Return_type_success_(return != FALSE) BOOL
ResourceCopyToFile(_In_z_ const WCHAR *DestinationPath, _In_z_ const WCHAR *ResourceName)
{
DWORD SizeResource;
const void *LockedResource = ResourceGetAddress(ResourceName, &SizeResource);
if (!LockedResource)
{
LOG(WINTUN_LOG_ERR, L"Failed to locate resource %s", ResourceName);
return FALSE;
}
HANDLE DestinationHandle = CreateFileW(
DestinationPath,
GENERIC_WRITE,
0,
&SecurityAttributes,
CREATE_NEW,
FILE_ATTRIBUTE_NORMAL | FILE_ATTRIBUTE_TEMPORARY,
NULL);
if (DestinationHandle == INVALID_HANDLE_VALUE)
{
LOG_LAST_ERROR(L"Failed to create file %s", DestinationPath);
return FALSE;
}
DWORD BytesWritten;
DWORD LastError;
if (!WriteFile(DestinationHandle, LockedResource, SizeResource, &BytesWritten, NULL))
{
LastError = LOG_LAST_ERROR(L"Failed to write file %s", DestinationPath);
goto cleanupDestinationHandle;
}
if (BytesWritten != SizeResource)
{
LOG(WINTUN_LOG_ERR,
L"Incomplete write to %s (written: %u, expected: %u)",
DestinationPath,
BytesWritten,
SizeResource);
LastError = ERROR_WRITE_FAULT;
goto cleanupDestinationHandle;
}
LastError = ERROR_SUCCESS;
cleanupDestinationHandle:
CloseHandle(DestinationHandle);
return RET_ERROR(TRUE, LastError);
}
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