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/*
* openvpnmsica -- Custom Action DLL to provide OpenVPN-specific support to MSI packages
* https://community.openvpn.net/openvpn/wiki/OpenVPNMSICA
*
* Copyright (C) 2018-2021 Simon Rozman <simon@rozman.si>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#elif defined(_MSC_VER)
#include <config-msvc.h>
#endif
#include "msiex.h"
#include "../tapctl/error.h"
#include <windows.h>
#include <malloc.h>
#include <memory.h>
#include <msiquery.h>
#ifdef _MSC_VER
#pragma comment(lib, "msi.lib")
#endif
UINT
msi_get_string(
_In_ MSIHANDLE hInstall,
_In_z_ LPCTSTR szName,
_Out_ LPTSTR *pszValue)
{
if (pszValue == NULL)
{
return ERROR_BAD_ARGUMENTS;
}
/* Try with stack buffer first. */
TCHAR szBufStack[128];
DWORD dwLength = _countof(szBufStack);
UINT uiResult = MsiGetProperty(hInstall, szName, szBufStack, &dwLength);
if (uiResult == ERROR_SUCCESS)
{
/* Copy from stack. */
*pszValue = (LPTSTR)malloc(++dwLength * sizeof(TCHAR));
if (*pszValue == NULL)
{
msg(M_FATAL, "%s: malloc(%u) failed", dwLength * sizeof(TCHAR));
return ERROR_OUTOFMEMORY;
}
memcpy(*pszValue, szBufStack, dwLength * sizeof(TCHAR));
return ERROR_SUCCESS;
}
else if (uiResult == ERROR_MORE_DATA)
{
/* Allocate on heap and retry. */
LPTSTR szBufHeap = (LPTSTR)malloc(++dwLength * sizeof(TCHAR));
if (szBufHeap == NULL)
{
msg(M_FATAL, "%s: malloc(%u) failed", __FUNCTION__, dwLength * sizeof(TCHAR));
return ERROR_OUTOFMEMORY;
}
uiResult = MsiGetProperty(hInstall, szName, szBufHeap, &dwLength);
if (uiResult == ERROR_SUCCESS)
{
*pszValue = szBufHeap;
}
else
{
free(szBufHeap);
}
return uiResult;
}
else
{
SetLastError(uiResult); /* MSDN does not mention MsiGetProperty() to set GetLastError(). But we do have an error code. Set last error manually. */
msg(M_NONFATAL | M_ERRNO, "%s: MsiGetProperty failed", __FUNCTION__);
return uiResult;
}
}
UINT
msi_get_record_string(
_In_ MSIHANDLE hRecord,
_In_ unsigned int iField,
_Out_ LPTSTR *pszValue)
{
if (pszValue == NULL)
{
return ERROR_BAD_ARGUMENTS;
}
/* Try with stack buffer first. */
TCHAR szBufStack[128];
DWORD dwLength = _countof(szBufStack);
UINT uiResult = MsiRecordGetString(hRecord, iField, szBufStack, &dwLength);
if (uiResult == ERROR_SUCCESS)
{
/* Copy from stack. */
*pszValue = (LPTSTR)malloc(++dwLength * sizeof(TCHAR));
if (*pszValue == NULL)
{
msg(M_FATAL, "%s: malloc(%u) failed", __FUNCTION__, dwLength * sizeof(TCHAR));
return ERROR_OUTOFMEMORY;
}
memcpy(*pszValue, szBufStack, dwLength * sizeof(TCHAR));
return ERROR_SUCCESS;
}
else if (uiResult == ERROR_MORE_DATA)
{
/* Allocate on heap and retry. */
LPTSTR szBufHeap = (LPTSTR)malloc(++dwLength * sizeof(TCHAR));
if (szBufHeap == NULL)
{
msg(M_FATAL, "%s: malloc(%u) failed", __FUNCTION__, dwLength * sizeof(TCHAR));
return ERROR_OUTOFMEMORY;
}
uiResult = MsiRecordGetString(hRecord, iField, szBufHeap, &dwLength);
if (uiResult == ERROR_SUCCESS)
{
*pszValue = szBufHeap;
}
else
{
free(szBufHeap);
}
return uiResult;
}
else
{
SetLastError(uiResult); /* MSDN does not mention MsiRecordGetString() to set GetLastError(). But we do have an error code. Set last error manually. */
msg(M_NONFATAL | M_ERRNO, "%s: MsiRecordGetString failed", __FUNCTION__);
return uiResult;
}
}
UINT
msi_format_record(
_In_ MSIHANDLE hInstall,
_In_ MSIHANDLE hRecord,
_Out_ LPTSTR *pszValue)
{
if (pszValue == NULL)
{
return ERROR_BAD_ARGUMENTS;
}
/* Try with stack buffer first. */
TCHAR szBufStack[128];
DWORD dwLength = _countof(szBufStack);
UINT uiResult = MsiFormatRecord(hInstall, hRecord, szBufStack, &dwLength);
if (uiResult == ERROR_SUCCESS)
{
/* Copy from stack. */
*pszValue = (LPTSTR)malloc(++dwLength * sizeof(TCHAR));
if (*pszValue == NULL)
{
msg(M_FATAL, "%s: malloc(%u) failed", __FUNCTION__, dwLength * sizeof(TCHAR));
return ERROR_OUTOFMEMORY;
}
memcpy(*pszValue, szBufStack, dwLength * sizeof(TCHAR));
return ERROR_SUCCESS;
}
else if (uiResult == ERROR_MORE_DATA)
{
/* Allocate on heap and retry. */
LPTSTR szBufHeap = (LPTSTR)malloc(++dwLength * sizeof(TCHAR));
if (szBufHeap == NULL)
{
msg(M_FATAL, "%s: malloc(%u) failed", __FUNCTION__, dwLength * sizeof(TCHAR));
return ERROR_OUTOFMEMORY;
}
uiResult = MsiFormatRecord(hInstall, hRecord, szBufHeap, &dwLength);
if (uiResult == ERROR_SUCCESS)
{
*pszValue = szBufHeap;
}
else
{
free(szBufHeap);
}
return uiResult;
}
else
{
SetLastError(uiResult); /* MSDN does not mention MsiFormatRecord() to set GetLastError(). But we do have an error code. Set last error manually. */
msg(M_NONFATAL | M_ERRNO, "%s: MsiFormatRecord failed", __FUNCTION__);
return uiResult;
}
}
UINT
msi_format_field(
_In_ MSIHANDLE hInstall,
_In_ MSIHANDLE hRecord,
_In_ unsigned int iField,
_Out_ LPTSTR *pszValue)
{
if (pszValue == NULL)
{
return ERROR_BAD_ARGUMENTS;
}
/* Read string to format. */
LPTSTR szValue = NULL;
UINT uiResult = msi_get_record_string(hRecord, iField, &szValue);
if (uiResult != ERROR_SUCCESS)
{
return uiResult;
}
if (szValue[0] == 0)
{
/* The string is empty. There's nothing left to do. */
*pszValue = szValue;
return ERROR_SUCCESS;
}
/* Create a temporary record. */
MSIHANDLE hRecordEx = MsiCreateRecord(1);
if (!hRecordEx)
{
uiResult = ERROR_INVALID_HANDLE;
msg(M_NONFATAL, "%s: MsiCreateRecord failed", __FUNCTION__);
goto cleanup_szValue;
}
/* Populate the record with data. */
uiResult = MsiRecordSetString(hRecordEx, 0, szValue);
if (uiResult != ERROR_SUCCESS)
{
SetLastError(uiResult); /* MSDN does not mention MsiRecordSetString() to set GetLastError(). But we do have an error code. Set last error manually. */
msg(M_NONFATAL | M_ERRNO, "%s: MsiRecordSetString failed", __FUNCTION__);
goto cleanup_hRecordEx;
}
/* Do the formatting. */
uiResult = msi_format_record(hInstall, hRecordEx, pszValue);
cleanup_hRecordEx:
MsiCloseHandle(hRecordEx);
cleanup_szValue:
free(szValue);
return uiResult;
}
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