348 lines
8.3 KiB
C++
348 lines
8.3 KiB
C++
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// utils.cpp : Implementation of helper functions
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#include "stdafx.h"
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#include <dns.h>
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#include <macfile.h>
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HRESULT
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GetErrorMessageFromModule(
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IN DWORD dwError,
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IN LPCTSTR lpszDll,
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OUT LPTSTR *ppBuffer
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)
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{
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if (0 == dwError || !lpszDll || !*lpszDll || !ppBuffer)
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return E_INVALIDARG;
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HRESULT hr = S_OK;
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HINSTANCE hMsgLib = LoadLibrary(lpszDll);
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if (!hMsgLib)
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hr = HRESULT_FROM_WIN32(GetLastError());
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else
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{
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DWORD dwRet = ::FormatMessage(
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FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_HMODULE,
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hMsgLib, dwError, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
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(LPTSTR)ppBuffer, 0, NULL);
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if (0 == dwRet)
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hr = HRESULT_FROM_WIN32(GetLastError());
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FreeLibrary(hMsgLib);
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}
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return hr;
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}
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HRESULT
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GetErrorMessage(
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IN DWORD i_dwError,
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OUT CString& cstrErrorMsg
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)
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{
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if (0 == i_dwError)
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return E_INVALIDARG;
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HRESULT hr = S_OK;
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LPTSTR lpBuffer = NULL;
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DWORD dwRet = ::FormatMessage(
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FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM,
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NULL, i_dwError, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
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(LPTSTR)&lpBuffer, 0, NULL);
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if (0 == dwRet)
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{
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// if no message is found, GetLastError will return ERROR_MR_MID_NOT_FOUND
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hr = HRESULT_FROM_WIN32(GetLastError());
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if (HRESULT_FROM_WIN32(ERROR_MR_MID_NOT_FOUND) == hr ||
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0x80070000 == (i_dwError & 0xffff0000) ||
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0 == (i_dwError & 0xffff0000) )
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{
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hr = GetErrorMessageFromModule((i_dwError & 0x0000ffff), _T("netmsg.dll"), &lpBuffer);
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if (HRESULT_FROM_WIN32(ERROR_MR_MID_NOT_FOUND) == hr)
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{
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int iError = i_dwError; // convert to a signed integer
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if (iError >= AFPERR_MIN && iError < AFPERR_BASE)
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{
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// use a positive number to search sfmmsg.dll
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hr = GetErrorMessageFromModule(-iError, _T("sfmmsg.dll"), &lpBuffer);
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}
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}
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}
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}
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if (SUCCEEDED(hr))
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{
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cstrErrorMsg = lpBuffer;
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LocalFree(lpBuffer);
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}
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else
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{
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// we failed to retrieve the error message from system/netmsg.dll/sfmmsg.dll,
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// report the error code directly to user
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hr = S_OK;
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cstrErrorMsg.Format(_T("0x%x"), i_dwError);
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}
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return S_OK;
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}
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void
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GetDisplayMessageHelper(
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OUT CString& cstrMsg,
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IN DWORD dwErr, // error code
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IN UINT iStringId, // string resource Id
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IN va_list *parglist) // Optional arguments
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{
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HRESULT hr = S_OK;
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CString cstrErrorMsg;
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if (dwErr)
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hr = GetErrorMessage(dwErr, cstrErrorMsg);
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if (SUCCEEDED(hr))
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{
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if (iStringId == 0)
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{
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if (dwErr)
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{
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cstrMsg = cstrErrorMsg;
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} else
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{
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cstrMsg = va_arg(*parglist, LPCTSTR);
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}
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}
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else
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{
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CString cstrString;
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cstrString.LoadString(iStringId);
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LPTSTR lpBuffer = NULL;
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DWORD dwRet = ::FormatMessage(
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FORMAT_MESSAGE_FROM_STRING | FORMAT_MESSAGE_ALLOCATE_BUFFER,
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cstrString,
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0, // dwMessageId
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0, // dwLanguageId, ignored
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(LPTSTR)&lpBuffer,
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0, // nSize
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parglist);
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if (dwRet == 0)
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{
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hr = HRESULT_FROM_WIN32(GetLastError());
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}
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else
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{
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cstrMsg = lpBuffer;
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if (dwErr)
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cstrMsg += cstrErrorMsg;
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LocalFree(lpBuffer);
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}
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}
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}
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if (FAILED(hr))
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{
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// Failed to retrieve the proper message, report the failure directly to user
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cstrMsg.Format(_T("0x%x"), hr);
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}
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}
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void
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GetDisplayMessage(
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OUT CString& cstrMsg,
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IN DWORD dwErr, // error code
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IN UINT iStringId, // string resource Id
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...) // Optional arguments
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{
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va_list arglist;
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va_start(arglist, iStringId);
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GetDisplayMessageHelper(cstrMsg, dwErr, iStringId, &arglist);
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va_end(arglist);
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}
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int
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DisplayMessageBox(
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IN HWND hwndParent,
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IN UINT uType, // style of message box
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IN DWORD dwErr, // error code
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IN UINT iStringId, // string resource Id
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...) // Optional arguments
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{
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CString cstrCaption;
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CString cstrMsg;
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cstrCaption.LoadString(IDS_WIZARD_TITLE);
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va_list arglist;
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va_start(arglist, iStringId);
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GetDisplayMessageHelper(cstrMsg, dwErr, iStringId, &arglist);
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va_end(arglist);
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return ::MessageBox(hwndParent, cstrMsg, cstrCaption, uType);
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}
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// NOTE: this function only handles limited cases, e.g., no ip address
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BOOL IsLocalComputer(IN LPCTSTR lpszComputer)
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{
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if (!lpszComputer || !*lpszComputer)
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return TRUE;
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if ( _tcslen(lpszComputer) > 2 && *lpszComputer == _T('\\') && *(lpszComputer + 1) == _T('\\') )
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lpszComputer += 2;
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BOOL bReturn = FALSE;
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DWORD dwErr = 0;
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TCHAR szBuffer[DNS_MAX_NAME_BUFFER_LENGTH];
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DWORD dwSize = DNS_MAX_NAME_BUFFER_LENGTH;
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// 1st: compare against local Netbios computer name
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if ( !GetComputerNameEx(ComputerNameNetBIOS, szBuffer, &dwSize) )
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{
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dwErr = GetLastError();
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} else
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{
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bReturn = (0 == lstrcmpi(szBuffer, lpszComputer));
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if (!bReturn)
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{ // 2nd: compare against local Dns computer name
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dwSize = DNS_MAX_NAME_BUFFER_LENGTH;
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if (GetComputerNameEx(ComputerNameDnsFullyQualified, szBuffer, &dwSize))
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bReturn = (0 == lstrcmpi(szBuffer, lpszComputer));
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else
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dwErr = GetLastError();
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}
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}
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if (dwErr)
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TRACE(_T("IsLocalComputer dwErr = %x\n"), dwErr);
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return bReturn;
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}
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void GetFullPath(
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IN LPCTSTR lpszServer,
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IN LPCTSTR lpszDir,
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OUT CString& cstrPath
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)
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{
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ASSERT(lpszDir && *lpszDir);
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if (IsLocalComputer(lpszServer))
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{
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cstrPath = lpszDir;
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} else
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{
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if (*lpszServer != _T('\\') || *(lpszServer + 1) != _T('\\'))
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{
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cstrPath = _T("\\\\");
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cstrPath += lpszServer;
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} else
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{
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cstrPath = lpszServer;
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}
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cstrPath += _T("\\");
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cstrPath += lpszDir;
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int i = cstrPath.Find(_T(':'));
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ASSERT(-1 != i);
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cstrPath.SetAt(i, _T('$'));
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}
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}
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// Purpose: verify if the specified drive belongs to a list of disk drives on the server
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// Return:
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// S_OK: yes
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// S_FALSE: no
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// hr: some error happened
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HRESULT
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VerifyDriveLetter(
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IN LPCTSTR lpszServer,
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IN LPCTSTR lpszDrive
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)
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{
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HRESULT hr = S_FALSE;
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LPBYTE pBuffer = NULL;
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DWORD dwEntriesRead = 0;
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DWORD dwTotalEntries = 0;
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DWORD dwRet = NetServerDiskEnum(
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const_cast<LPTSTR>(lpszServer),
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0,
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&pBuffer,
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-1,
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&dwEntriesRead,
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&dwTotalEntries,
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NULL);
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if (NERR_Success == dwRet)
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{
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LPTSTR pDrive = (LPTSTR)pBuffer;
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for (UINT i=0; i<dwEntriesRead; i++)
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{
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if (_totupper(*pDrive) == _totupper(*lpszDrive))
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{
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hr = S_OK;
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break;
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}
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pDrive += 3;
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}
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NetApiBufferFree(pBuffer);
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} else
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{
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hr = HRESULT_FROM_WIN32(dwRet);
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}
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return hr;
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}
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// Purpose: is there a related admin $ share
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// Return:
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// S_OK: yes
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// S_FALSE: no
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// hr: some error happened
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HRESULT
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IsAdminShare(
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IN LPCTSTR lpszServer,
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IN LPCTSTR lpszDrive
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)
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{
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ASSERT(!IsLocalComputer(lpszServer));
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HRESULT hr = S_FALSE;
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LPBYTE pBuffer = NULL;
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DWORD dwEntriesRead = 0;
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DWORD dwTotalEntries = 0;
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DWORD dwRet = NetShareEnum(
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const_cast<LPTSTR>(lpszServer),
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1,
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&pBuffer,
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-1,
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&dwEntriesRead,
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&dwTotalEntries,
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NULL);
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if (NERR_Success == dwRet)
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{
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PSHARE_INFO_1 pShareInfo = (PSHARE_INFO_1)pBuffer;
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for (UINT i=0; i<dwEntriesRead; i++)
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{
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if ( (pShareInfo->shi1_type & STYPE_SPECIAL) &&
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_tcslen(pShareInfo->shi1_netname) == 2 &&
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*(pShareInfo->shi1_netname + 1) == _T('$') &&
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_totupper(*(pShareInfo->shi1_netname)) == _totupper(*lpszDrive) )
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{
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hr = S_OK;
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break;
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}
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pShareInfo++;
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}
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NetApiBufferFree(pBuffer);
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} else
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{
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hr = HRESULT_FROM_WIN32(dwRet);
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}
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return hr;
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}
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