installer: do not require KB2921916

In anticipation of upcoming wintun changes.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

2 files changed, 0 insertions, 96 deletions

diff --git a/installer/customactions.c b/installer/customactions.c
index 981415e1..7c6a528e 100644
--- a/installer/customactions.c
+++ b/installer/customactions.c
@@ -122,94 +122,6 @@ out:
 	return ret;
 }
 
-extern NTAPI __declspec(dllimport) void RtlGetNtVersionNumbers(DWORD *MajorVersion, DWORD *MinorVersion, DWORD *BuildNumber);
-
-static int message_box(MSIHANDLE installer, TCHAR *text, UINT type)
-{
-	TCHAR progressOnly[2];
-	DWORD len;
-	MSIHANDLE record;
-	int ret;
-
-	len = _countof(progressOnly);
-	if (MsiGetProperty(installer, TEXT("MsiUIProgressOnly"), progressOnly, &len) == ERROR_SUCCESS && _tcstoul(progressOnly, NULL, 10) == 1)
-		return MessageBox(GetForegroundWindow(), text, TEXT("WireGuard"), type);
-	record = MsiCreateRecord(2);
-	MsiRecordSetString(record, 0, TEXT("[1]"));
-	MsiRecordSetString(record, 1, text);
-	ret = MsiProcessMessage(installer, INSTALLMESSAGE_USER | type, record);
-	MsiCloseHandle(record);
-	return ret;
-}
-
-__declspec(dllexport) UINT __stdcall CheckKB2921916(MSIHANDLE installer)
-{
-	bool is_com_initialized = SUCCEEDED(CoInitialize(NULL));
-	UINT ret = ERROR_SUCCESS;
-	DWORD maj, min, build, len;
-	TCHAR uiLevel[10];
-	TCHAR setupapi_path[MAX_PATH];
-	HANDLE setupapi_handle = INVALID_HANDLE_VALUE;
-	HANDLE setupapi_filemapping = NULL;
-	const char *setupapi_bytes = NULL;
-	MEMORY_BASIC_INFORMATION setupapi_meminfo;
-	static const char setupapi_marker[] = "Signature Hash";
-
-	RtlGetNtVersionNumbers(&maj, &min, &build);
-	if (maj != 6 || min != 1)
-		goto out;
-
-	ret = ERROR_INSTALL_FAILURE;
-	if (!GetSystemDirectory(setupapi_path, _countof(setupapi_path)))
-		goto out;
-	if (!PathAppend(setupapi_path, TEXT("setupapi.dll")))
-		goto out;
-	setupapi_handle = CreateFile(setupapi_path, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
-	if (setupapi_handle == INVALID_HANDLE_VALUE)
-		goto out;
-	setupapi_filemapping = CreateFileMapping(setupapi_handle, NULL, PAGE_READONLY, 0, 0, NULL);
-	if (!setupapi_filemapping)
-		goto out;
-	setupapi_bytes = MapViewOfFile(setupapi_filemapping, FILE_MAP_READ, 0, 0, 0);
-	if (!setupapi_bytes)
-		goto out;
-	if (VirtualQuery(setupapi_bytes, &setupapi_meminfo, sizeof(setupapi_meminfo)) != sizeof(setupapi_meminfo))
-		goto out;
-	if (setupapi_meminfo.RegionSize > strlen(setupapi_marker)) {
-		for (const char *p = setupapi_bytes + strlen(setupapi_marker) - 1; (p = memchr(p, 'h', setupapi_meminfo.RegionSize - (p - setupapi_bytes))); ++p) {
-			if (!memcmp(p - strlen(setupapi_marker) + 1, setupapi_marker, strlen(setupapi_marker))) {
-				ret = ERROR_SUCCESS;
-				goto out;
-			}
-		}
-	}
-
-	len = _countof(uiLevel);
-	if (MsiGetProperty(installer, TEXT("UILevel"), uiLevel, &len) != ERROR_SUCCESS || _tcstoul(uiLevel, NULL, 10) < INSTALLUILEVEL_BASIC) {
-		log_messagef(installer, LOG_LEVEL_MSIERR, TEXT("Use of WireGuard on Windows 7 requires KB2921916."));
-		goto out;
-	}
-#ifdef _WIN64
-	static const TCHAR url[] = TEXT("https://download.wireguard.com/windows-toolchain/distfiles/Windows6.1-KB2921916-x64.msu");
-#else
-	static const TCHAR url[] = TEXT("https://download.wireguard.com/windows-toolchain/distfiles/Windows6.1-KB2921916-x86.msu");
-#endif
-	if (message_box(installer, TEXT("Missing Windows Hotfix\n\nUse of WireGuard on Windows 7 requires KB2921916. Would you like to download the hotfix in your web browser?"), MB_ICONWARNING | MB_YESNO) == IDYES)
-		ShellExecute(GetForegroundWindow(), NULL, url, NULL, NULL, SW_SHOWNORMAL);
-	ret = ERROR_INSTALL_USEREXIT;
-
-out:
-	if (setupapi_bytes)
-		UnmapViewOfFile(setupapi_bytes);
-	if (setupapi_filemapping)
-		CloseHandle(setupapi_filemapping);
-	if (setupapi_handle != INVALID_HANDLE_VALUE)
-		CloseHandle(setupapi_handle);
-	if (is_com_initialized)
-		CoUninitialize();
-	return ret;
-}
-
 static UINT insert_service_control(MSIHANDLE installer, MSIHANDLE view, const TCHAR *service_name, bool start)
 {
 	static unsigned int index = 0;
diff --git a/installer/wireguard.wxs b/installer/wireguard.wxs
index a0fc1396..9cc27156 100644
--- a/installer/wireguard.wxs
+++ b/installer/wireguard.wxs
@@ -102,14 +102,6 @@
 		</InstallExecuteSequence>
 
 		<!--
-			Abort early if running without KB2921916 on Windows 7
-		-->
-		<CustomAction Id="CheckKB2921916" BinaryKey="customactions.dll" DllEntry="CheckKB2921916" />
-		<InstallExecuteSequence>
-			<Custom Action="CheckKB2921916" After="CheckWow64">NOT REMOVE</Custom>
-		</InstallExecuteSequence>
-
-		<!--
 			Evaluate WireGuard services and populate ServiceControl table
 		-->
 		<CustomAction Id="EvaluateWireGuardServices" BinaryKey="customactions.dll" DllEntry="EvaluateWireGuardServices" />