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/>.

**/

​

package dns

​

import (

    "strings"

    "unsafe"

​

    "golang.org/x/sys/windows"

    "golang.zabbix.com/sdk/zbxerr"

)

​

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

                }

​

                break

            }

        }

    }

​