From 5d8375007754101ff2889d0e79486c8f9b7cf5ab Mon Sep 17 00:00:00 2001
From: Rob Mensching <rob@firegiant.com>
Date: Sun, 3 Sep 2017 11:22:38 -0700
Subject: Initial commit

---
 src/dutil/polcutil.cpp | 111 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 111 insertions(+)
 create mode 100644 src/dutil/polcutil.cpp

(limited to 'src/dutil/polcutil.cpp')

diff --git a/src/dutil/polcutil.cpp b/src/dutil/polcutil.cpp
new file mode 100644
index 00000000..1cc29e61
--- /dev/null
+++ b/src/dutil/polcutil.cpp
@@ -0,0 +1,111 @@
+// 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.
+
+#include "precomp.h"
+
+const LPCWSTR REGISTRY_POLICIES_KEY = L"SOFTWARE\\Policies\\";
+
+static HRESULT OpenPolicyKey(
+    __in_z LPCWSTR wzPolicyPath,
+    __out HKEY* phk
+    );
+
+
+extern "C" HRESULT DAPI PolcReadNumber(
+    __in_z LPCWSTR wzPolicyPath,
+    __in_z LPCWSTR wzPolicyName,
+    __in DWORD dwDefault,
+    __out DWORD* pdw
+    )
+{
+    HRESULT hr = S_OK;
+    HKEY hk = NULL;
+
+    hr = OpenPolicyKey(wzPolicyPath, &hk);
+    if (E_FILENOTFOUND == hr || E_PATHNOTFOUND == hr)
+    {
+        ExitFunction1(hr = S_FALSE);
+    }
+    ExitOnFailure(hr, "Failed to open policy key: %ls", wzPolicyPath);
+
+    hr = RegReadNumber(hk, wzPolicyName, pdw);
+    if (E_FILENOTFOUND == hr || E_PATHNOTFOUND == hr)
+    {
+        ExitFunction1(hr = S_FALSE);
+    }
+    ExitOnFailure(hr, "Failed to open policy key: %ls, name: %ls", wzPolicyPath, wzPolicyName);
+
+LExit:
+    ReleaseRegKey(hk);
+
+    if (S_FALSE == hr || FAILED(hr))
+    {
+        *pdw = dwDefault;
+    }
+
+    return hr;
+}
+
+extern "C" HRESULT DAPI PolcReadString(
+    __in_z LPCWSTR wzPolicyPath,
+    __in_z LPCWSTR wzPolicyName,
+    __in_z_opt LPCWSTR wzDefault,
+    __deref_out_z LPWSTR* pscz
+    )
+{
+    HRESULT hr = S_OK;
+    HKEY hk = NULL;
+
+    hr = OpenPolicyKey(wzPolicyPath, &hk);
+    if (E_FILENOTFOUND == hr || E_PATHNOTFOUND == hr)
+    {
+        ExitFunction1(hr = S_FALSE);
+    }
+    ExitOnFailure(hr, "Failed to open policy key: %ls", wzPolicyPath);
+
+    hr = RegReadString(hk, wzPolicyName, pscz);
+    if (E_FILENOTFOUND == hr || E_PATHNOTFOUND == hr)
+    {
+        ExitFunction1(hr = S_FALSE);
+    }
+    ExitOnFailure(hr, "Failed to open policy key: %ls, name: %ls", wzPolicyPath, wzPolicyName);
+
+LExit:
+    ReleaseRegKey(hk);
+
+    if (S_FALSE == hr || FAILED(hr))
+    {
+        if (NULL == wzDefault)
+        {
+            ReleaseNullStr(*pscz);
+        }
+        else
+        {
+            hr = StrAllocString(pscz, wzDefault, 0);
+        }
+    }
+
+    return hr;
+}
+
+
+// internal functions
+
+static HRESULT OpenPolicyKey(
+    __in_z LPCWSTR wzPolicyPath,
+    __out HKEY* phk
+    )
+{
+    HRESULT hr = S_OK;
+    LPWSTR sczPath = NULL;
+
+    hr = PathConcat(REGISTRY_POLICIES_KEY, wzPolicyPath, &sczPath);
+    ExitOnFailure(hr, "Failed to combine logging path with root path.");
+
+    hr = RegOpen(HKEY_LOCAL_MACHINE, sczPath, KEY_READ, phk);
+    ExitOnFailure(hr, "Failed to open policy registry key.");
+
+LExit:
+    ReleaseStr(sczPath);
+
+    return hr;
+}
-- 
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