370 lines
13 KiB
C++
370 lines
13 KiB
C++
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//+---------------------------------------------------------------------------
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//
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// Microsoft Windows
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// Copyright (C) Microsoft Corporation, 1997.
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//
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// File: E X P O R T S . C P P
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//
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// Contents: Exported functions from NETCFG.DLL
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//
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// Notes:
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//
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// Author: danielwe 5 Dec 1997
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//
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//----------------------------------------------------------------------------
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#include "pch.h"
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#pragma hdrstop
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#include "ncreg.h"
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#include "ncsetup.h"
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#include "ncsvc.h"
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#define REGSTR_PATH_SVCHOST L"Software\\Microsoft\\Windows NT\\CurrentVersion\\Svchost"
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HRESULT
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HrPrepareForSvchostEnum (
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IN PCWSTR pszService,
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IN OUT CServiceManager* pscm,
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IN OUT CService* psvc,
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OUT LPQUERY_SERVICE_CONFIG* ppOriginalConfig,
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OUT HKEY* phkeySvchost,
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OUT PWSTR* ppszValueNameBuffer,
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OUT DWORD* pcchValueNameBuffer,
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OUT PWSTR* ppmszValueBuffer,
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OUT DWORD* pcbValueBuffer)
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{
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// Initialize the output parameters.
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//
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*ppOriginalConfig = NULL;
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*phkeySvchost = NULL;
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*ppszValueNameBuffer = NULL;
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*pcchValueNameBuffer = 0;
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*ppmszValueBuffer = NULL;
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*pcbValueBuffer = 0;
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const DWORD dwScmAccess = STANDARD_RIGHTS_REQUIRED |
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SC_MANAGER_CONNECT |
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SC_MANAGER_LOCK;
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const DWORD dwSvcAccess = STANDARD_RIGHTS_REQUIRED |
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SERVICE_QUERY_CONFIG |
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SERVICE_CHANGE_CONFIG;
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// Open the service and lock the service database so we can change
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// the service's configuration.
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//
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HRESULT hr = pscm->HrOpenService (
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psvc,
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pszService,
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WITH_LOCK,
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dwScmAccess,
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dwSvcAccess);
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if (SUCCEEDED(hr))
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{
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// Query the service's current configuration in the event we
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// need to revert what we set.
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//
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LPQUERY_SERVICE_CONFIG pOriginalConfig;
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hr = psvc->HrQueryServiceConfig (&pOriginalConfig);
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if (SUCCEEDED(hr))
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{
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// Open the svchost software key and query information
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// about it like the length of the longest value name
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// and longest value.
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//
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HKEY hkeySvchost;
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hr = HrRegOpenKeyEx (
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HKEY_LOCAL_MACHINE, REGSTR_PATH_SVCHOST,
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KEY_READ | KEY_SET_VALUE,
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&hkeySvchost);
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if (SUCCEEDED(hr))
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{
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DWORD cchMaxValueNameLen;
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DWORD cbMaxValueLen;
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LONG lr = RegQueryInfoKeyW (hkeySvchost,
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NULL, // lpClass
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NULL, // lpcbClass
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NULL, // lpReserved
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NULL, // lpcSubKeys
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NULL, // lpcbMaxSubKeyLen
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NULL, // lpcbMaxClassLen
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NULL, // lpcValues
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&cchMaxValueNameLen,
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&cbMaxValueLen,
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NULL, // lpcbSecurityDescriptor
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NULL // lpftLastWriteTime
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);
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hr = HRESULT_FROM_WIN32 (lr);
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if (SUCCEEDED(hr))
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{
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// Make sure the name buffer length (in bytes) is a
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// multiple of sizeof(WCHAR). This is because we expect
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// to use RegEnumValue which accepts and returns buffer
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// size in characters. We tell it the the buffer
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// capacity (in characters) is count of bytes divided
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// by sizeof(WCHAR). So, to avoid any round off
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// error (which would not occur in our favor) we make
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// sure that the buffer size is a multiple of
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// sizeof(WCHAR).
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//
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INT cbFraction = cbMaxValueLen % sizeof(WCHAR);
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if (cbFraction)
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{
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cbMaxValueLen += sizeof(WCHAR) - cbFraction;
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}
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// Need room for the null terminator as RegQueryInfoKey
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// doesn't return it.
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//
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cchMaxValueNameLen++;
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// Allocate buffers for the longest value name and value
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// data for our caller to use.
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//
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PWSTR pszValueNameBuffer = (PWSTR)
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MemAlloc (cchMaxValueNameLen * sizeof(WCHAR));
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PWSTR pmszValueBuffer = (PWSTR) MemAlloc (cbMaxValueLen);
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if ((pszValueNameBuffer != NULL) &&
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(pmszValueBuffer != NULL))
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{
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*ppOriginalConfig = pOriginalConfig;
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*phkeySvchost = hkeySvchost;
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*ppszValueNameBuffer = pszValueNameBuffer;
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*pcchValueNameBuffer = cchMaxValueNameLen;
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*ppmszValueBuffer = pmszValueBuffer;
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*pcbValueBuffer = cbMaxValueLen;
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hr = S_OK;
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}
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else
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{
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hr = E_OUTOFMEMORY;
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}
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}
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if (FAILED(hr))
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{
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RegCloseKey (hkeySvchost);
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}
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}
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if (FAILED(hr))
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{
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MemFree (pOriginalConfig);
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}
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}
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}
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TraceError ("HrPrepareForSvchostEnum", hr);
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return hr;
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}
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STDAPI
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SvchostChangeSvchostGroup (
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PCWSTR pszService,
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PCWSTR pszNewGroup
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)
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{
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Assert (pszService);
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Assert (pszNewGroup);
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static const WCHAR c_pszBasePath [] =
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L"%SystemRoot%\\System32\\svchost.exe -k ";
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// Validate the new group name by making sure it doesn't exceed
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// MAX_PATH when combined with the base path.
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//
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if (!pszService || !pszNewGroup ||
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!*pszService || !*pszNewGroup ||
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(lstrlenW (c_pszBasePath) + lstrlenW (pszNewGroup) > MAX_PATH))
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{
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return E_INVALIDARG;
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}
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// Form the new image path based on the base path and the new group
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// name.
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//
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WCHAR pszImagePath [MAX_PATH + 1];
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lstrcpyW (pszImagePath, c_pszBasePath);
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lstrcatW (pszImagePath, pszNewGroup);
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// Need to change the ImagePath of the service as well as the
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// Svchost Group values. The implementation tries to ensure that
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// both of these changes are made or neither of them are made.
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//
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// Prepare for the enumeration by setting up a few pieces of information
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// first. HrPrepareForSvchostEnum sets up all of these variables.
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//
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// SCM is opened and locked, pszService is opened for config change.
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//
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CServiceManager scm;
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CService svc;
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// pszService's current configration is obtained in the event we
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// need to rollback, we'll use this info to reset the ImagePath.
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//
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LPQUERY_SERVICE_CONFIG pOriginalConfig;
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// hkeySvcHost is opened at REGSTR_PATH_SVCHOST and is used to
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// enumerate the values under it.
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//
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HKEY hkeySvcHost;
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// These buffers are allocated so that RegEnumValue will have a place
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// to store what was enumerated.
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//
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PWSTR pszValueNameBuffer;
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DWORD cchValueNameBuffer;
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PWSTR pmszValueBuffer;
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DWORD cbValueBuffer;
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HRESULT hr = HrPrepareForSvchostEnum (
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pszService,
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&scm,
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&svc,
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&pOriginalConfig,
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&hkeySvcHost,
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&pszValueNameBuffer,
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&cchValueNameBuffer,
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&pmszValueBuffer,
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&cbValueBuffer);
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if (SUCCEEDED(hr))
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{
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// Set the new image path of the service.
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//
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hr = svc.HrSetImagePath (pszImagePath);
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if (SUCCEEDED(hr))
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{
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// fAddNewValue will be set to FALSE if we've found an existing
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// group name value.
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//
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BOOL fAddNewValue = TRUE;
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BOOL fChanged;
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// Now perform the enumeration. For each value enumerated,
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// make sure the service name is included in the multi-sz
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// for the valuename that matches the new group name. For all
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// other values, make sure the service name is not included
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// in the multi-sz.
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//
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DWORD dwIndex = 0;
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do
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{
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DWORD dwType;
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DWORD cchValueName = cchValueNameBuffer;
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DWORD cbValue = cbValueBuffer;
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hr = HrRegEnumValue (hkeySvcHost, dwIndex,
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pszValueNameBuffer, &cchValueName,
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&dwType,
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(LPBYTE)pmszValueBuffer, &cbValue);
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if (SUCCEEDED(hr) && (REG_MULTI_SZ == dwType))
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{
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// If we find a value that matches the group name,
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// make sure the service is a part of the mutli-sz
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// value.
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//
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if (0 == lstrcmpiW (pszNewGroup, pszValueNameBuffer))
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{
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// Since we found an existing group name, we don't
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// need to add a new one.
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//
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fAddNewValue = FALSE;
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PWSTR pmszNewValue;
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hr = HrAddSzToMultiSz (pszService,
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pmszValueBuffer,
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STRING_FLAG_DONT_MODIFY_IF_PRESENT |
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STRING_FLAG_ENSURE_AT_END,
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0,
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&pmszNewValue,
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&fChanged);
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if (SUCCEEDED(hr) && fChanged)
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{
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hr = HrRegSetMultiSz (hkeySvcHost,
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pszNewGroup,
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pmszNewValue);
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MemFree (pmszNewValue);
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}
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}
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// Otherwise, since the value does not match the group
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// name, make sure the service is NOT part of the
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// mutli-sz value.
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//
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else
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{
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RemoveSzFromMultiSz (pszService,
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pmszValueBuffer, STRING_FLAG_REMOVE_ALL,
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&fChanged);
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if (fChanged)
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{
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hr = HrRegSetMultiSz (hkeySvcHost,
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pszValueNameBuffer,
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pmszValueBuffer);
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}
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}
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}
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else if (HRESULT_FROM_WIN32(ERROR_NO_MORE_ITEMS) == hr)
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{
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hr = S_OK;
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break;
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}
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dwIndex++;
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}
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while (S_OK == hr);
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// If we need to add a new group name, do so.
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//
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if (SUCCEEDED(hr) && fAddNewValue)
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{
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// Add pszService to a empty multi-sz. This has the effect
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// of creating a multi-sz from a single string.
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//
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PWSTR pmszNewValue;
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hr = HrAddSzToMultiSz (pszService,
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NULL,
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STRING_FLAG_ENSURE_AT_END, 0,
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&pmszNewValue, &fChanged);
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if (S_OK == hr)
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{
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// We know that it should have been added, so assert
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// that the multi-sz "changed".
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//
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Assert (fChanged);
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// Add the new value by setting the multi-sz in the
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// registry.
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//
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hr = HrRegSetMultiSz (hkeySvcHost,
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pszNewGroup,
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pmszNewValue);
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MemFree (pmszNewValue);
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}
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}
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}
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RegCloseKey (hkeySvcHost);
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MemFree (pmszValueBuffer);
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MemFree (pszValueNameBuffer);
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MemFree (pOriginalConfig);
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}
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TraceError ("SvchostChangeSvchostGroup", hr);
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return hr;
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}
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