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 agent

​

import (

    "bytes"

    "errors"

    "fmt"

    "io/ioutil"

    "os"

    "strings"

    "unicode"

    "unicode/utf8"

​

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

    "zabbix.com/pkg/tls"

)

​

var Options AgentOptions

​

const (

    HostNameLen      = 128

    hostNameListLen  = 2048

    HostMetadataLen  = 65535 // UTF-8 characters, not bytes

    HostInterfaceLen = 255   // UTF-8 characters, not bytes

)

​

// CutAfterN returns the whole string s, if it is not longer then n runes (not bytes). Otherwise it returns the

// beginning of the string s, which is cut after the fist n runes.

func CutAfterN(s string, n int) string {

    var i int

    for pos := range s {

        if i >= n {

            return s[:pos]

        }

        i++

    }

​

    return s

}

​

func CheckHostnameParameter(s string) error {

    for i := 0; i < len(s); i++ {

        if s[i] == '.' || s[i] == ' ' || s[i] == '_' || s[i] == '-' || s[i] == ',' ||

            (s[i] >= 'A' && s[i] <= 'Z') || (s[i] >= 'a' && s[i] <= 'z') || (s[i] >= '0' && s[i] <= '9') {

            continue