forked from nadoo/glider
-
Notifications
You must be signed in to change notification settings - Fork 0
/
uottun.go
110 lines (90 loc) · 2.05 KB
/
uottun.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
package uottun
import (
"io/ioutil"
"net"
"net/url"
"strings"
"time"
"github.com/nadoo/glider/common/conn"
"github.com/nadoo/glider/common/log"
"github.com/nadoo/glider/proxy"
)
// UoTTun udp over tcp tunnel
type UoTTun struct {
dialer proxy.Dialer
addr string
raddr string
}
func init() {
proxy.RegisterServer("uottun", NewUoTTunServer)
}
// NewUoTTun returns a UoTTun proxy
func NewUoTTun(s string, dialer proxy.Dialer) (*UoTTun, error) {
u, err := url.Parse(s)
if err != nil {
log.F("parse err: %s", err)
return nil, err
}
addr := u.Host
d := strings.Split(addr, "=")
p := &UoTTun{
dialer: dialer,
addr: d[0],
raddr: d[1],
}
return p, nil
}
// NewUoTTunServer returns a uot tunnel server
func NewUoTTunServer(s string, dialer proxy.Dialer) (proxy.Server, error) {
return NewUoTTun(s, dialer)
}
// ListenAndServe .
func (s *UoTTun) ListenAndServe() {
c, err := net.ListenPacket("udp", s.addr)
if err != nil {
log.F("[uottun] failed to listen on %s: %v", s.addr, err)
return
}
defer c.Close()
log.F("[uottun] listening UDP on %s", s.addr)
buf := make([]byte, conn.UDPBufSize)
for {
n, clientAddr, err := c.ReadFrom(buf)
if err != nil {
log.F("[uottun] read error: %v", err)
continue
}
rc, err := s.dialer.Dial("uot", s.raddr)
if err != nil {
log.F("[uottun] failed to connect to server %v: %v", s.raddr, err)
continue
}
go func() {
// no remote forwarder, just a local udp forwarder
if urc, ok := rc.(*net.UDPConn); ok {
conn.TimedCopy(c, clientAddr, urc, 2*time.Minute)
urc.Close()
return
}
// remote forwarder, udp over tcp
resp, err := ioutil.ReadAll(rc)
if err != nil {
log.F("error in ioutil.ReadAll: %s\n", err)
return
}
rc.Close()
c.WriteTo(resp, clientAddr)
}()
_, err = rc.Write(buf[:n])
if err != nil {
log.F("[uottun] remote write error: %v", err)
continue
}
log.F("[uottun] %s <-> %s", clientAddr, s.raddr)
}
}
// Serve .
func (s *UoTTun) Serve(c net.Conn) {
// TODO
log.F("[uottun] func Serve: can not be called directly")
}