102 lines
2.1 KiB
Go
102 lines
2.1 KiB
Go
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// Copyright 2016 Mikio Hara. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package tcpinfo
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// A State represents a state of connection.
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type State int
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const (
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Unknown State = iota
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Closed
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Listen
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SynSent
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SynReceived
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Established
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FinWait1
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FinWait2
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CloseWait
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LastAck
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Closing
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TimeWait
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)
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var states = map[State]string{
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Unknown: "unknown",
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Closed: "closed",
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Listen: "listen",
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SynSent: "syn-sent",
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SynReceived: "syn-received",
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Established: "established",
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FinWait1: "fin-wait-1",
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FinWait2: "fin-wait-2",
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CloseWait: "close-wait",
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LastAck: "last-ack",
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Closing: "closing",
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TimeWait: "time-wait",
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}
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func (st State) String() string {
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s, ok := states[st]
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if !ok {
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return "<nil>"
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}
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return s
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}
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// An OptionKind represents an option kind.
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type OptionKind int
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const (
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KindMaxSegSize OptionKind = 2
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KindWindowScale OptionKind = 3
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KindSACKPermitted OptionKind = 4
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KindTimestamps OptionKind = 8
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)
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var optionKinds = map[OptionKind]string{
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KindMaxSegSize: "mss",
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KindWindowScale: "wscale",
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KindSACKPermitted: "sack",
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KindTimestamps: "tmstamps",
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}
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func (k OptionKind) String() string {
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s, ok := optionKinds[k]
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if !ok {
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return "<nil>"
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}
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return s
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}
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// An Option represents an option.
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type Option interface {
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Kind() OptionKind
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}
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// A MaxSegSize represents a maxiumum segment size option.
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type MaxSegSize uint
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// Kind returns an option kind field.
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func (mss MaxSegSize) Kind() OptionKind { return KindMaxSegSize }
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// A WindowScale represents a windows scale option.
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type WindowScale int
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// Kind returns an option kind field.
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func (ws WindowScale) Kind() OptionKind { return KindWindowScale }
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// A SACKPermitted reports whether a selective acknowledgment
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// permitted option is enabled.
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type SACKPermitted bool
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// Kind returns an option kind field.
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func (sp SACKPermitted) Kind() OptionKind { return KindSACKPermitted }
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// A Timestamps reports whether a timestamps option is enabled.
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type Timestamps bool
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// Kind returns an option kind field.
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func (ts Timestamps) Kind() OptionKind { return KindTimestamps }
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