openvpnmsica.h

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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) 2018-2025 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, see <https://www.gnu.org/licenses/>.
 */
 
#ifndef MSICA_H
#define MSICA_H
 
#include <windows.h>
#include <msi.h>
#include "../tapctl/basic.h"
 
 
/*
 * Error codes (next unused 2552L)
 */
#define ERROR_MSICA       2550L
#define ERROR_MSICA_ERRNO 2551L
 
 
struct openvpnmsica_thread_data
{
    MSIHANDLE hInstall; 
};
 
 
extern DWORD openvpnmsica_thread_data_idx;
 
 
#define OPENVPNMSICA_SAVE_MSI_SESSION(hInstall)                                           \
    {                                                                                     \
        struct openvpnmsica_thread_data *s =                                              \
            (struct openvpnmsica_thread_data *)TlsGetValue(openvpnmsica_thread_data_idx); \
        s->hInstall = (hInstall);                                                         \
    }
 
 
/*
 * Exported DLL Functions
 */
 
#ifdef __cplusplus
extern "C"
{
#endif
 
/* Ensure that clang-cl, which does not understand the cl specific
 * preprocessor defines like #pragma comment(linker, DLLEXP_EXPORT)
 * is handled the same way as mingw and uses the alternative instead
 * and does not define DLLEXP_EXPORT */
#if defined(__GNUC__) || defined(__clang__)
#define DLLEXP_DECL __declspec(dllexport)
#else
#define DLLEXP_DECL
#define DLLEXP_EXPORT "/EXPORT:" __FUNCTION__ "=" __FUNCDNAME__
#endif
 
 
    DLLEXP_DECL UINT __stdcall FindSystemInfo(_In_ MSIHANDLE hInstall);
 
 
    DLLEXP_DECL UINT __stdcall CloseOpenVPNGUI(_In_ MSIHANDLE hInstall);
 
 
    DLLEXP_DECL UINT __stdcall StartOpenVPNGUI(_In_ MSIHANDLE hInstall);
 
 
    DLLEXP_DECL UINT __stdcall EvaluateTUNTAPAdapters(_In_ MSIHANDLE hInstall);
 
 
    DLLEXP_DECL UINT __stdcall ProcessDeferredAction(_In_ MSIHANDLE hInstall);
 
 
    DLLEXP_DECL UINT __stdcall CheckAndScheduleReboot(_In_ MSIHANDLE hInstall);
 
#ifdef __cplusplus
}
#endif
 
#endif /* ifndef MSICA_H */