forked from ginuerzh/gost
/
udp.go
175 lines (152 loc) · 3.54 KB
/
udp.go
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
package main
import (
"bytes"
"github.com/ginuerzh/gosocks5"
"github.com/golang/glog"
"net"
"time"
)
type UDPConn struct {
isClient bool
udp *net.UDPConn
addr net.Addr
tcp net.Conn
}
func Client(conn net.Conn, addr net.Addr) *UDPConn {
c := &UDPConn{isClient: true}
switch conn := conn.(type) {
case *net.UDPConn:
c.udp = conn
c.addr = addr
default:
c.tcp = conn
}
return c
}
func Server(conn net.Conn) *UDPConn {
c := &UDPConn{}
switch conn := conn.(type) {
case *net.UDPConn:
c.udp = conn
default:
c.tcp = conn
}
return c
}
func (c *UDPConn) ReadUDP() (*gosocks5.UDPDatagram, error) {
if c.isClient {
return c.readUDPClient()
}
return c.readUDPServer()
}
func (c *UDPConn) ReadUDPTimeout(timeout time.Duration) (*gosocks5.UDPDatagram, error) {
if c.udp != nil {
c.udp.SetReadDeadline(time.Now().Add(timeout))
defer c.udp.SetReadDeadline(time.Time{})
} else {
c.tcp.SetReadDeadline(time.Now().Add(timeout))
defer c.tcp.SetReadDeadline(time.Time{})
}
if c.isClient {
return c.readUDPClient()
}
return c.readUDPServer()
}
func (c *UDPConn) readUDPClient() (*gosocks5.UDPDatagram, error) {
if c.udp != nil {
return gosocks5.ReadUDPDatagram(c.udp)
}
return gosocks5.ReadUDPDatagram(c.tcp)
}
func (c *UDPConn) readUDPServer() (*gosocks5.UDPDatagram, error) {
if c.udp != nil {
b := make([]byte, 65535)
n, addr, err := c.udp.ReadFrom(b)
if err != nil {
return nil, err
}
dgram := gosocks5.NewUDPDatagram(
gosocks5.NewUDPHeader(0, 0, ToSocksAddr(addr)), b[:n])
return dgram, nil
}
return gosocks5.ReadUDPDatagram(c.tcp)
}
func (c *UDPConn) WriteUDP(dgram *gosocks5.UDPDatagram) error {
if c.isClient {
return c.writeUDPClient(dgram)
}
return c.writeUDPServer(dgram)
}
func (c *UDPConn) WriteUDPTimeout(dgram *gosocks5.UDPDatagram, timeout time.Duration) error {
if c.udp != nil {
c.udp.SetWriteDeadline(time.Now().Add(timeout))
defer c.udp.SetWriteDeadline(time.Time{})
} else {
c.tcp.SetWriteDeadline(time.Now().Add(timeout))
defer c.tcp.SetWriteDeadline(time.Time{})
}
if c.isClient {
return c.writeUDPClient(dgram)
}
return c.writeUDPServer(dgram)
}
func (c *UDPConn) writeUDPClient(dgram *gosocks5.UDPDatagram) error {
if c.udp != nil {
dgram.Header.Rsv = 0
buffer := bytes.Buffer{}
dgram.Write(&buffer)
_, err := c.udp.WriteTo(buffer.Bytes(), c.addr)
return err
}
dgram.Header.Rsv = uint16(len(dgram.Data))
return dgram.Write(c.tcp)
}
func (c *UDPConn) writeUDPServer(dgram *gosocks5.UDPDatagram) error {
if c.udp != nil {
addr, err := net.ResolveUDPAddr("udp", dgram.Header.Addr.String())
if err != nil {
glog.V(LWARNING).Infoln(err)
return nil // drop silently
}
_, err = c.udp.WriteTo(dgram.Data, addr)
return err
}
dgram.Header.Rsv = uint16(len(dgram.Data))
return dgram.Write(c.tcp)
}
func (c *UDPConn) Close() error {
if c.udp != nil {
return c.udp.Close()
}
return c.tcp.Close()
}
func (c *UDPConn) LocalAddr() net.Addr {
if c.udp != nil {
return c.udp.LocalAddr()
}
return c.tcp.LocalAddr()
}
func (c *UDPConn) RemoteAddr() net.Addr {
if c.udp != nil {
return c.udp.RemoteAddr()
}
return c.tcp.RemoteAddr()
}
func (c *UDPConn) SetDeadline(t time.Time) error {
if c.udp != nil {
return c.udp.SetDeadline(t)
}
return c.tcp.SetDeadline(t)
}
func (c *UDPConn) SetReadDeadline(t time.Time) error {
if c.udp != nil {
return c.udp.SetReadDeadline(t)
}
return c.tcp.SetReadDeadline(t)
}
func (c *UDPConn) SetWriteDeadline(t time.Time) error {
if c.udp != nil {
return c.udp.SetWriteDeadline(t)
}
return c.tcp.SetWriteDeadline(t)
}