Zabbix

/*

** Copyright (C) 2001-2025 Zabbix SIA

**

** This program is free software: you can redistribute it and/or modify it under the terms of

** the GNU Affero General Public License as published by the Free Software Foundation, version 3.

**

** 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 Affero General Public License for more details.

**

** You should have received a copy of the GNU Affero General Public License along with this program.

** If not, see <https://www.gnu.org/licenses/>.

**/

​

#include "zbxsysinfo.h"

#include "../sysinfo.h"

​

#include "zbxstr.h"

#include "zbxnum.h"

#include "zbxlog.h"

#include "zbxjson.h"

​

/* __stdcall calling convention is used for GetIfEntry2(). In order to declare a */

/* pointer to GetIfEntry2() we have to expand NETIOPAPI_API macro manually since */

/* part of it must be together with the pointer name in the parentheses.         */

typedef NETIO_STATUS (NETIOAPI_API_ *pGetIfEntry2_t)(PMIB_IF_ROW2 Row);

​

/* GetIfEntry2() is available since Windows Vista and Windows Server 2008. In    */

/* earlier Windows releases this pointer remains set to NULL and GetIfEntry() is */

/* used directly instead.                                                        */

static pGetIfEntry2_t   pGetIfEntry2 = NULL;

​

/* GetIfEntry2() and GetIfEntry() work with different MIB interface structures.  */

/* Use zbx_ifrow_t variables and zbx_ifrow_*() functions below instead of        */

/* version specific MIB interface API.                                           */

typedef struct

{

    MIB_IFROW   *ifRow;     /* 32-bit counters */

    MIB_IF_ROW2 *ifRow2;    /* 64-bit counters, supported since Windows Vista, Server 2008 */

}

zbx_ifrow_t;

​

/******************************************************************************

 *                                                                            *

 * Purpose: initializes zbx_ifrow_t variable                                  *

 *                                                                            *

 * Parameters:                                                                *

 *     pIfRow      - [IN/OUT] pointer to zbx_ifrow_t variable with all        *

 *                            members set to NULL                             *

 *                                                                            *

 * Comments: allocates memory, calls zbx_ifrow_clean() with pointer to free   *

 *           it                                                               *

 *                                                                            *

 ******************************************************************************/

static void zbx_ifrow_init(zbx_ifrow_t *pIfRow)

{

    HMODULE     module;

    static  char    check_done = FALSE;

​

    /* check (once) if GetIfEntry2() is available on this system */

    if (FALSE == check_done)

    {

        if (NULL != (module = GetModuleHandle(L"iphlpapi.dll")))

        {

            if (NULL == (pGetIfEntry2 = (pGetIfEntry2_t)GetProcAddress(module, "GetIfEntry2")))

            {

                zabbix_log(LOG_LEVEL_DEBUG, "GetProcAddress failed with error: %s",

                        zbx_strerror_from_system(GetLastError()));

            }

        }

        else

        {

            zabbix_log(LOG_LEVEL_DEBUG, "GetModuleHandle failed with error: %s",

                    zbx_strerror_from_system(GetLastError()));

        }

​

        check_done = TRUE;

    }

​

    /* allocate the relevant MIB interface structure */

    if (NULL != pGetIfEntry2)

        pIfRow->ifRow2 = zbx_malloc(pIfRow->ifRow2, sizeof(MIB_IF_ROW2));

    else

        pIfRow->ifRow = zbx_malloc(pIfRow->ifRow, sizeof(MIB_IFROW));

}

​

/******************************************************************************

 *                                                                            *

 * Purpose: cleans zbx_ifrow_t variable                                       *

 *                                                                            *

 * Parameters:                                                                *