tcpinfo

Documentation

Overview

Package tcpinfo implements encoding and decoding of TCP-level socket options regarding connection information.

The Transmission Control Protocol (TCP) is defined in RFC 793. TCP Selective Acknowledgment Options is defined in RFC 2018. Management Information Base for the Transmission Control Protocol (TCP) is defined in RFC 4022. TCP Congestion Control is defined in RFC 5681. Computing TCP's Retransmission Timer is described in RFC 6298. TCP Options and Maximum Segment Size (MSS) is defined in RFC 6691. Shared Use of Experimental TCP Options is defined in RFC 6994. TCP Extensions for High Performance is defined in RFC 7323.

Example:

import (
	"github.com/mikioh/tcp"
	"github.com/mikioh/tcpinfo"
)

c, err := net.Dial("tcp", "golang.org:80")
if err != nil {
	// error handling
}
defer c.Close()

tc, err := tcp.NewConn(c)
if err != nil {
	// error handling
}
var o tcpinfo.Info
var b [256]byte
i, err := tc.Option(o.Level(), o.Name(), b[:])
if err != nil {
	// error handling
}
txt, err := json.Marshal(i)
if err != nil {
	// error handling
}
fmt.Println(txt)

Index

• Constants
• type TCPInfo

Constants

const (
	TCP_INFO      = 0xb
	SizeofTCPInfo = 0x90
)

Types

type TCPInfo

type TCPInfo struct {
	State           uint8
	Ca_state        uint8
	Retransmits     uint8
	Probes          uint8
	Backoff         uint8
	Options         uint8
	Pad_cgo_0       [2]byte
	Rto             uint32
	Ato             uint32
	Snd_mss         uint32
	Rcv_mss         uint32
	Unacked         uint32
	Sacked          uint32
	Lost            uint32
	Retrans         uint32
	Fackets         uint32
	Last_data_sent  uint32
	Last_ack_sent   uint32
	Last_data_recv  uint32
	Last_ack_recv   uint32
	Pmtu            uint32
	Rcv_ssthresh    uint32
	Rtt             uint32
	Rttvar          uint32
	Snd_ssthresh    uint32
	Snd_cwnd        uint32
	Advmss          uint32
	Reordering      uint32
	Rcv_rtt         uint32
	Rcv_space       uint32
	Total_retrans   uint32
	Pacing_rate     uint64
	Max_pacing_rate uint64
	Bytes_acked     uint64
	Bytes_received  uint64
	Segs_out        uint32
	Segs_in         uint32
}