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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 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 "openvpnmsica.h"
#include "../tapctl/error.h"
#include <windows.h>
#include <msi.h>
#include <msiquery.h>
#ifdef _MSC_VER
#pragma comment(lib, "msi.lib")
#endif
#include <stdio.h>
#include <tchar.h>
DWORD openvpnmsica_thread_data_idx = TLS_OUT_OF_INDEXES;
/**
* DLL entry point
*/
BOOL WINAPI
DllMain(
_In_ HINSTANCE hinstDLL,
_In_ DWORD dwReason,
_In_ LPVOID lpReserved)
{
UNREFERENCED_PARAMETER(hinstDLL);
UNREFERENCED_PARAMETER(lpReserved);
switch (dwReason)
{
case DLL_PROCESS_ATTACH:
/* Allocate thread local storage index. */
openvpnmsica_thread_data_idx = TlsAlloc();
if (openvpnmsica_thread_data_idx == TLS_OUT_OF_INDEXES)
{
return FALSE;
}
/* Fall through. */
case DLL_THREAD_ATTACH:
{
/* Create thread local storage data. */
struct openvpnmsica_thread_data *s = (struct openvpnmsica_thread_data *)calloc(1, sizeof(struct openvpnmsica_thread_data));
if (s == NULL)
{
return FALSE;
}
TlsSetValue(openvpnmsica_thread_data_idx, s);
break;
}
case DLL_PROCESS_DETACH:
if (openvpnmsica_thread_data_idx != TLS_OUT_OF_INDEXES)
{
/* Free thread local storage data and index. */
free(TlsGetValue(openvpnmsica_thread_data_idx));
TlsFree(openvpnmsica_thread_data_idx);
}
break;
case DLL_THREAD_DETACH:
/* Free thread local storage data. */
free(TlsGetValue(openvpnmsica_thread_data_idx));
break;
}
return TRUE;
}
bool
dont_mute(unsigned int flags)
{
UNREFERENCED_PARAMETER(flags);
return true;
}
void
x_msg_va(const unsigned int flags, const char *format, va_list arglist)
{
/* Secure last error before it is overridden. */
DWORD dwResult = (flags & M_ERRNO) != 0 ? GetLastError() : ERROR_SUCCESS;
struct openvpnmsica_thread_data *s = (struct openvpnmsica_thread_data *)TlsGetValue(openvpnmsica_thread_data_idx);
if (s->hInstall == 0)
{
/* No MSI session, no fun. */
return;
}
/* Prepare the message record. The record will contain up to four fields. */
MSIHANDLE hRecordProg = MsiCreateRecord(4);
{
/* Field 2: The message string. */
char szBufStack[128];
int iResultLen = vsnprintf(szBufStack, _countof(szBufStack), format, arglist);
if (iResultLen < _countof(szBufStack))
{
/* Use from stack. */
MsiRecordSetStringA(hRecordProg, 2, szBufStack);
}
else
{
/* Allocate on heap and retry. */
char *szMessage = (char *)malloc(++iResultLen * sizeof(char));
if (szMessage != NULL)
{
vsnprintf(szMessage, iResultLen, format, arglist);
MsiRecordSetStringA(hRecordProg, 2, szMessage);
free(szMessage);
}
else
{
/* Use stack variant anyway, but make sure it's zero-terminated. */
szBufStack[_countof(szBufStack) - 1] = 0;
MsiRecordSetStringA(hRecordProg, 2, szBufStack);
}
}
}
if ((flags & M_ERRNO) == 0)
{
/* Field 1: MSI Error Code */
MsiRecordSetInteger(hRecordProg, 1, ERROR_MSICA);
}
else
{
/* Field 1: MSI Error Code */
MsiRecordSetInteger(hRecordProg, 1, ERROR_MSICA_ERRNO);
/* Field 3: The Windows error number. */
MsiRecordSetInteger(hRecordProg, 3, dwResult);
/* Field 4: The Windows error description. */
LPTSTR szErrMessage = NULL;
if (FormatMessage(
FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_IGNORE_INSERTS,
0,
dwResult,
0,
(LPTSTR)&szErrMessage,
0,
NULL) && szErrMessage)
{
/* Trim trailing whitespace. Set terminator after the last non-whitespace character. This prevents excessive trailing line breaks. */
for (size_t i = 0, i_last = 0;; i++)
{
if (szErrMessage[i])
{
if (!_istspace(szErrMessage[i]))
{
i_last = i + 1;
}
}
else
{
szErrMessage[i_last] = 0;
break;
}
}
MsiRecordSetString(hRecordProg, 4, szErrMessage);
LocalFree(szErrMessage);
}
}
MsiProcessMessage(s->hInstall, INSTALLMESSAGE_ERROR, hRecordProg);
MsiCloseHandle(hRecordProg);
}
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