Zabbix

//go:build !windows

// +build !windows

​

/*

** 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 (

    "fmt"

    "os"

    "strings"

)

​

func (o *options) setDefaultIP() (err error) {

    data, err := os.ReadFile("/etc/resolv.conf")

    if err != nil {

        return

    }

​

    s := strings.Split(string(data), "\n")

    for _, tmp := range s {

        if strings.HasPrefix(tmp, "nameserver") {

            return o.setIP(strings.TrimSpace(strings.TrimPrefix(tmp, "nameserver")))

        }

    }

​

    return fmt.Errorf("cannot find default dns nameserver")

}