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// 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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