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.

**/

​

package dns

​

import (

    "strings"

    "unsafe"

​

    "git.zabbix.com/ap/plugin-support/zbxerr"

    "golang.org/x/sys/windows"

)

​

func (o *options) setDefaultIP() error {

    l := uint32(20000)

    b := make([]byte, l)

​

    if err := windows.GetAdaptersAddresses(windows.AF_UNSPEC, windows.GAA_FLAG_INCLUDE_PREFIX, 0, (*windows.IpAdapterAddresses)(unsafe.Pointer(&b[0])), &l); err != nil {

        return err

    }

​

    var addresses []*windows.IpAdapterAddresses

    for addr := (*windows.IpAdapterAddresses)(unsafe.Pointer(&b[0])); addr != nil; addr = addr.Next {

        addresses = append(addresses, addr)

    }

​

    resolvers := map[string]bool{}

    for _, addr := range addresses {

        for next := addr.FirstUnicastAddress; next != nil; next = next.Next {

            if addr.OperStatus != windows.IfOperStatusUp {

                continue

            }

​

            if next.Address.IP() != nil {

                for dnsServer := addr.FirstDnsServerAddress; dnsServer != nil; dnsServer = dnsServer.Next {

                    ip := dnsServer.Address.IP()

                    if ip.IsMulticast() || ip.IsLinkLocalMulticast() || ip.IsLinkLocalUnicast() || ip.IsUnspecified() {

                        continue

                    }

​

                    if ip.To16() != nil && strings.HasPrefix(ip.To16().String(), "fec0:") {

                        continue

                    }

​

                    resolvers[ip.String()] = true

                }

​