summaryrefslogtreecommitdiff
path: root/vendor/golang.org/x/net/icmp/endpoint.go
blob: 7640a8c5d0c1c3be9df143b90fafa0010385b6f2 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
// Copyright 2014 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package icmp

import (
	"net"
	"runtime"
	"time"

	"golang.org/x/net/ipv4"
	"golang.org/x/net/ipv6"
)

var _ net.PacketConn = &PacketConn{}

// A PacketConn represents a packet network endpoint that uses either
// ICMPv4 or ICMPv6.
type PacketConn struct {
	c  net.PacketConn
	p4 *ipv4.PacketConn
	p6 *ipv6.PacketConn
}

func (c *PacketConn) ok() bool { return c != nil && c.c != nil }

// IPv4PacketConn returns the ipv4.PacketConn of c.
// It returns nil when c is not created as the endpoint for ICMPv4.
func (c *PacketConn) IPv4PacketConn() *ipv4.PacketConn {
	if !c.ok() {
		return nil
	}
	return c.p4
}

// IPv6PacketConn returns the ipv6.PacketConn of c.
// It returns nil when c is not created as the endpoint for ICMPv6.
func (c *PacketConn) IPv6PacketConn() *ipv6.PacketConn {
	if !c.ok() {
		return nil
	}
	return c.p6
}

// ReadFrom reads an ICMP message from the connection.
func (c *PacketConn) ReadFrom(b []byte) (int, net.Addr, error) {
	if !c.ok() {
		return 0, nil, errInvalidConn
	}
	// Please be informed that ipv4.NewPacketConn enables
	// IP_STRIPHDR option by default on Darwin.
	// See golang.org/issue/9395 for further information.
	if runtime.GOOS == "darwin" && c.p4 != nil {
		n, _, peer, err := c.p4.ReadFrom(b)
		return n, peer, err
	}
	return c.c.ReadFrom(b)
}

// WriteTo writes the ICMP message b to dst.
// Dst must be net.UDPAddr when c is a non-privileged
// datagram-oriented ICMP endpoint. Otherwise it must be net.IPAddr.
func (c *PacketConn) WriteTo(b []byte, dst net.Addr) (int, error) {
	if !c.ok() {
		return 0, errInvalidConn
	}
	return c.c.WriteTo(b, dst)
}

// Close closes the endpoint.
func (c *PacketConn) Close() error {
	if !c.ok() {
		return errInvalidConn
	}
	return c.c.Close()
}

// LocalAddr returns the local network address.
func (c *PacketConn) LocalAddr() net.Addr {
	if !c.ok() {
		return nil
	}
	return c.c.LocalAddr()
}

// SetDeadline sets the read and write deadlines associated with the
// endpoint.
func (c *PacketConn) SetDeadline(t time.Time) error {
	if !c.ok() {
		return errInvalidConn
	}
	return c.c.SetDeadline(t)
}

// SetReadDeadline sets the read deadline associated with the
// endpoint.
func (c *PacketConn) SetReadDeadline(t time.Time) error {
	if !c.ok() {
		return errInvalidConn
	}
	return c.c.SetReadDeadline(t)
}

// SetWriteDeadline sets the write deadline associated with the
// endpoint.
func (c *PacketConn) SetWriteDeadline(t time.Time) error {
	if !c.ok() {
		return errInvalidConn
	}
	return c.c.SetWriteDeadline(t)
}