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
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
|
// Copyright 2012 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 ipv4
import (
"net"
"syscall"
"time"
"golang.org/x/net/internal/socket"
)
// BUG(mikio): On Windows, the JoinSourceSpecificGroup,
// LeaveSourceSpecificGroup, ExcludeSourceSpecificGroup and
// IncludeSourceSpecificGroup methods of PacketConn and RawConn are
// not implemented.
// A Conn represents a network endpoint that uses the IPv4 transport.
// It is used to control basic IP-level socket options such as TOS and
// TTL.
type Conn struct {
genericOpt
}
type genericOpt struct {
*socket.Conn
}
func (c *genericOpt) ok() bool { return c != nil && c.Conn != nil }
// NewConn returns a new Conn.
func NewConn(c net.Conn) *Conn {
cc, _ := socket.NewConn(c)
return &Conn{
genericOpt: genericOpt{Conn: cc},
}
}
// A PacketConn represents a packet network endpoint that uses the
// IPv4 transport. It is used to control several IP-level socket
// options including multicasting. It also provides datagram based
// network I/O methods specific to the IPv4 and higher layer protocols
// such as UDP.
type PacketConn struct {
genericOpt
dgramOpt
payloadHandler
}
type dgramOpt struct {
*socket.Conn
}
func (c *dgramOpt) ok() bool { return c != nil && c.Conn != nil }
// SetControlMessage sets the per packet IP-level socket options.
func (c *PacketConn) SetControlMessage(cf ControlFlags, on bool) error {
if !c.payloadHandler.ok() {
return syscall.EINVAL
}
return setControlMessage(c.dgramOpt.Conn, &c.payloadHandler.rawOpt, cf, on)
}
// SetDeadline sets the read and write deadlines associated with the
// endpoint.
func (c *PacketConn) SetDeadline(t time.Time) error {
if !c.payloadHandler.ok() {
return syscall.EINVAL
}
return c.payloadHandler.PacketConn.SetDeadline(t)
}
// SetReadDeadline sets the read deadline associated with the
// endpoint.
func (c *PacketConn) SetReadDeadline(t time.Time) error {
if !c.payloadHandler.ok() {
return syscall.EINVAL
}
return c.payloadHandler.PacketConn.SetReadDeadline(t)
}
// SetWriteDeadline sets the write deadline associated with the
// endpoint.
func (c *PacketConn) SetWriteDeadline(t time.Time) error {
if !c.payloadHandler.ok() {
return syscall.EINVAL
}
return c.payloadHandler.PacketConn.SetWriteDeadline(t)
}
// Close closes the endpoint.
func (c *PacketConn) Close() error {
if !c.payloadHandler.ok() {
return syscall.EINVAL
}
return c.payloadHandler.PacketConn.Close()
}
// NewPacketConn returns a new PacketConn using c as its underlying
// transport.
func NewPacketConn(c net.PacketConn) *PacketConn {
cc, _ := socket.NewConn(c.(net.Conn))
p := &PacketConn{
genericOpt: genericOpt{Conn: cc},
dgramOpt: dgramOpt{Conn: cc},
payloadHandler: payloadHandler{PacketConn: c, Conn: cc},
}
return p
}
// A RawConn represents a packet network endpoint that uses the IPv4
// transport. It is used to control several IP-level socket options
// including IPv4 header manipulation. It also provides datagram
// based network I/O methods specific to the IPv4 and higher layer
// protocols that handle IPv4 datagram directly such as OSPF, GRE.
type RawConn struct {
genericOpt
dgramOpt
packetHandler
}
// SetControlMessage sets the per packet IP-level socket options.
func (c *RawConn) SetControlMessage(cf ControlFlags, on bool) error {
if !c.packetHandler.ok() {
return syscall.EINVAL
}
return setControlMessage(c.dgramOpt.Conn, &c.packetHandler.rawOpt, cf, on)
}
// SetDeadline sets the read and write deadlines associated with the
// endpoint.
func (c *RawConn) SetDeadline(t time.Time) error {
if !c.packetHandler.ok() {
return syscall.EINVAL
}
return c.packetHandler.IPConn.SetDeadline(t)
}
// SetReadDeadline sets the read deadline associated with the
// endpoint.
func (c *RawConn) SetReadDeadline(t time.Time) error {
if !c.packetHandler.ok() {
return syscall.EINVAL
}
return c.packetHandler.IPConn.SetReadDeadline(t)
}
// SetWriteDeadline sets the write deadline associated with the
// endpoint.
func (c *RawConn) SetWriteDeadline(t time.Time) error {
if !c.packetHandler.ok() {
return syscall.EINVAL
}
return c.packetHandler.IPConn.SetWriteDeadline(t)
}
// Close closes the endpoint.
func (c *RawConn) Close() error {
if !c.packetHandler.ok() {
return syscall.EINVAL
}
return c.packetHandler.IPConn.Close()
}
// NewRawConn returns a new RawConn using c as its underlying
// transport.
func NewRawConn(c net.PacketConn) (*RawConn, error) {
cc, err := socket.NewConn(c.(net.Conn))
if err != nil {
return nil, err
}
r := &RawConn{
genericOpt: genericOpt{Conn: cc},
dgramOpt: dgramOpt{Conn: cc},
packetHandler: packetHandler{IPConn: c.(*net.IPConn), Conn: cc},
}
so, ok := sockOpts[ssoHeaderPrepend]
if !ok {
return nil, errOpNoSupport
}
if err := so.SetInt(r.dgramOpt.Conn, boolint(true)); err != nil {
return nil, err
}
return r, nil
}
|
