-
-
Notifications
You must be signed in to change notification settings - Fork 2k
/
conn.go
166 lines (141 loc) · 3.27 KB
/
conn.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
package v2raygrpclite
import (
std_bufio "bufio"
"encoding/binary"
"io"
"net"
"net/http"
"os"
"time"
"github.com/sagernet/sing/common"
"github.com/sagernet/sing/common/baderror"
"github.com/sagernet/sing/common/buf"
M "github.com/sagernet/sing/common/metadata"
"github.com/sagernet/sing/common/rw"
)
// kanged from: https://github.com/Qv2ray/gun-lite
var _ net.Conn = (*GunConn)(nil)
type GunConn struct {
reader *std_bufio.Reader
writer io.Writer
flusher http.Flusher
create chan struct{}
err error
readRemaining int
}
func newGunConn(reader io.Reader, writer io.Writer, flusher http.Flusher) *GunConn {
return &GunConn{
reader: std_bufio.NewReader(reader),
writer: writer,
flusher: flusher,
}
}
func newLateGunConn(writer io.Writer) *GunConn {
return &GunConn{
create: make(chan struct{}),
writer: writer,
}
}
func (c *GunConn) setup(reader io.Reader, err error) {
if reader != nil {
c.reader = std_bufio.NewReader(reader)
}
c.err = err
close(c.create)
}
func (c *GunConn) Read(b []byte) (n int, err error) {
n, err = c.read(b)
return n, baderror.WrapH2(err)
}
func (c *GunConn) read(b []byte) (n int, err error) {
if c.reader == nil {
<-c.create
if c.err != nil {
return 0, c.err
}
}
if c.readRemaining > 0 {
if len(b) > c.readRemaining {
b = b[:c.readRemaining]
}
n, err = c.reader.Read(b)
c.readRemaining -= n
return
}
_, err = c.reader.Discard(6)
if err != nil {
return
}
dataLen, err := binary.ReadUvarint(c.reader)
if err != nil {
return
}
readLen := int(dataLen)
c.readRemaining = readLen
if len(b) > readLen {
b = b[:readLen]
}
n, err = c.reader.Read(b)
c.readRemaining -= n
return
}
func (c *GunConn) Write(b []byte) (n int, err error) {
varLen := rw.UVariantLen(uint64(len(b)))
buffer := buf.NewSize(6 + varLen + len(b))
header := buffer.Extend(6 + varLen)
header[0] = 0x00
binary.BigEndian.PutUint32(header[1:5], uint32(1+varLen+len(b)))
header[5] = 0x0A
binary.PutUvarint(header[6:], uint64(len(b)))
common.Must1(buffer.Write(b))
_, err = c.writer.Write(buffer.Bytes())
if err != nil {
return 0, baderror.WrapH2(err)
}
if c.flusher != nil {
c.flusher.Flush()
}
return len(b), nil
}
func (c *GunConn) WriteBuffer(buffer *buf.Buffer) error {
defer buffer.Release()
dataLen := buffer.Len()
varLen := rw.UVariantLen(uint64(dataLen))
header := buffer.ExtendHeader(6 + varLen)
header[0] = 0x00
binary.BigEndian.PutUint32(header[1:5], uint32(1+varLen+dataLen))
header[5] = 0x0A
binary.PutUvarint(header[6:], uint64(dataLen))
err := rw.WriteBytes(c.writer, buffer.Bytes())
if err != nil {
return baderror.WrapH2(err)
}
if c.flusher != nil {
c.flusher.Flush()
}
return nil
}
func (c *GunConn) FrontHeadroom() int {
return 6 + binary.MaxVarintLen64
}
func (c *GunConn) Close() error {
return common.Close(c.reader, c.writer)
}
func (c *GunConn) LocalAddr() net.Addr {
return M.Socksaddr{}
}
func (c *GunConn) RemoteAddr() net.Addr {
return M.Socksaddr{}
}
func (c *GunConn) SetDeadline(t time.Time) error {
return os.ErrInvalid
}
func (c *GunConn) SetReadDeadline(t time.Time) error {
return os.ErrInvalid
}
func (c *GunConn) SetWriteDeadline(t time.Time) error {
return os.ErrInvalid
}
func (c *GunConn) NeedAdditionalReadDeadline() bool {
return true
}