Fix faulty memory access in Util's User custom actions

Generally, clean up the handling of getting the domain from a server name by
centralizing and simplifying it behind an improved GetDomainFromServerName()
based on the buggy GetServerName().

Fixes 8576

1 files changed, 8 insertions, 0 deletions

diff --git a/src/ext/Util/ca/utilca.h b/src/ext/Util/ca/utilca.h
new file mode 100644
index 00000000..97c54561
--- /dev/null
+++ b/src/ext/Util/ca/utilca.h
@@ -0,0 +1,8 @@
+#pragma once
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+
+HRESULT GetDomainFromServerName(
+    __deref_out_z LPWSTR* ppwzDomainName,
+    __in_z LPCWSTR wzServerName,
+    __in DWORD dwFlags
+    );