Zabbix

/*

** Zabbix

** Copyright (C) 2001-2023 Zabbix SIA

**

** This program is free software; you can redistribute it and/or modify

** it under the terms of the GNU General Public License as published by

** the Free Software Foundation; either version 2 of the License, or

** (at your option) any later version.

**

** 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.

**/

​

#include "zbxip.h"

​

#include "zbxnum.h"

#include "zbxstr.h"

#include "log.h"

​

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

 *                                                                            *

 * Purpose: is string IPv4 address                                            *

 *                                                                            *

 * Parameters: ip - string                                                    *

 *                                                                            *

 * Return value: SUCCEED - is IPv4 address                                    *

 *               FAIL - otherwise                                             *

 *                                                                            *

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

int zbx_is_ip4(const char *ip)

{

    const char  *p = ip;

    int     digits = 0, dots = 0, res = FAIL, octet = 0;

​

    zabbix_log(LOG_LEVEL_DEBUG, "In %s() ip:'%s'", __func__, ip);

​

    while ('\0' != *p)

    {

        if (0 != isdigit(*p))

        {

            octet = octet * 10 + (*p - '0');

            digits++;

        }

        else if ('.' == *p)

        {

            if (0 == digits || 3 < digits || 255 < octet)

                break;

​

            digits = 0;

            octet = 0;

            dots++;

        }

        else

        {

            digits = 0;

            break;

        }