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 zbxcomms

​

import (

    "bytes"

    "compress/zlib"

    "encoding/binary"

    "encoding/json"

    "errors"

    "fmt"

    "io"

    "net"

    "time"

​

    "golang.zabbix.com/agent2/pkg/tls"

    "golang.zabbix.com/sdk/log"

)

​

const (

    TimeoutModeFixed = iota

    TimeoutModeShift

)

​

const headerSize = 4 + 1 + 4 + 4

const tcpProtocol = byte(0x01)

const zlibCompress = byte(0x02)

​

const (

    connStateAccept = iota + 1

    connStateConnect

    connStateEstablished

)

​

const (

    responseFailed = "failed"

)

​

type Connection struct {

    conn        net.Conn

    tlsConfig   *tls.Config

    state       int

    compress    bool

    timeout     time.Duration

    timeoutMode int

}

​

type Listener struct {

    listener  net.Listener

    tlsconfig *tls.Config

}