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
|
package socket
import (
"errors"
"fmt"
"log"
"net"
"strings"
"sync"
"tunnel/pkg/server/env"
"tunnel/pkg/server/opts"
"tunnel/pkg/server/queue"
)
var errAlreadyClosed = errors.New("already closed")
type exported struct {
info string
Channel
}
type Channel interface {
Send(wq queue.Q) error
Recv(rq queue.Q) error
Close() error
}
type S interface {
Open(env env.Env) (Channel, error)
Close()
}
type listenSocket struct {
proto, addr string
listen net.Listener
}
type conn struct {
net.Conn
once sync.Once
}
func (c exported) String() string {
return c.info
}
func newConn(cn net.Conn) Channel {
c := &conn{Conn: cn}
log.Println("open", c)
return c
}
func (c *conn) final(f func() error, err error) error {
if e := f(); e != nil {
if e == errAlreadyClosed {
return nil
} else {
return e
}
}
return err
}
func (c *conn) Send(wq queue.Q) error {
err := queue.IoCopy(c, wq.Writer())
return c.final(c.Close, err)
}
func (c *conn) Recv(rq queue.Q) error {
err := queue.IoCopy(rq.Reader(), c)
return c.final(c.Close, err)
}
func (c *conn) String() string {
local, remote := c.LocalAddr(), c.RemoteAddr()
return fmt.Sprintf("%s/%s->%s", local.Network(), local, remote)
}
func (c *conn) Close() error {
err := errAlreadyClosed
c.once.Do(func() {
log.Println("close", c)
err = c.Conn.Close()
})
return err
}
func New(desc string, env env.Env) (S, error) {
base, opts := opts.Parse(desc)
args := strings.SplitN(base, "/", 2)
var proto string
var addr string
if len(args) < 2 {
addr = args[0]
} else {
proto, addr = args[0], args[1]
}
if addr == "loop" {
return newLoopSocket()
}
if proto == "" {
proto = "tcp"
}
if addr == "" {
return nil, fmt.Errorf("bad socket '%s'", desc)
}
if _, ok := opts["listen"]; ok {
return newListenSocket(proto, addr)
}
if _, ok := opts["auto"]; ok {
return newAutoSocket(proto, addr)
}
return newDialSocket(proto, addr)
}
|
