forked from txthinking/brook
-
Notifications
You must be signed in to change notification settings - Fork 0
/
socks5.go
247 lines (231 loc) · 5.99 KB
/
socks5.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
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
package brook
import (
"errors"
"io"
"log"
"net"
"time"
cache "github.com/patrickmn/go-cache"
"github.com/txthinking/brook/plugin"
"github.com/txthinking/socks5"
)
// Socks5Server is the client of raw socks5 protocol
type Socks5Server struct {
Server *socks5.Server
Socks5Middleman plugin.Socks5Middleman
TCPTimeout int
TCPDeadline int // not refreshed
UDPDeadline int
UDPSessionTime int
ForwardAddress string
ForwardUserName string
ForwardPassword string
Cache *cache.Cache
}
// NewSocks5Server returns a new Socks5Server
func NewSocks5Server(addr, ip, userName, password string, tcpTimeout, tcpDeadline, udpDeadline, udpSessionTime int) (*Socks5Server, error) {
s5, err := socks5.NewClassicServer(addr, ip, userName, password, tcpTimeout, tcpDeadline, udpDeadline, udpSessionTime)
if err != nil {
return nil, err
}
cs := cache.New(cache.NoExpiration, cache.NoExpiration)
x := &Socks5Server{
Server: s5,
TCPTimeout: tcpTimeout,
TCPDeadline: tcpDeadline,
UDPDeadline: udpDeadline,
UDPSessionTime: udpSessionTime,
Cache: cs,
}
return x, nil
}
// SetSocks5Middleman sets socks5middleman plugin
func (x *Socks5Server) SetSocks5Middleman(m plugin.Socks5Middleman) {
x.Socks5Middleman = m
}
// ListenAndServe will let client start to listen and serve, sm can be nil
func (x *Socks5Server) ListenAndServe() error {
return x.Server.Run(nil)
}
// ListenAndForward will let client start a proxy to listen and forward to another socks5,
// sm can be nil
func (x *Socks5Server) ListenAndForward(addr, username, password string) error {
x.ForwardAddress = addr
x.ForwardUserName = username
x.ForwardPassword = password
return x.Server.Run(x)
}
// TCPHandle handles tcp request
func (x *Socks5Server) TCPHandle(s *socks5.Server, c *net.TCPConn, r *socks5.Request) error {
if x.Socks5Middleman != nil {
done, err := x.Socks5Middleman.TCPHandle(s, c, r)
if err != nil {
if done {
return err
}
return ErrorReply(r, c, err)
}
if done {
return nil
}
}
client, err := socks5.NewClient(x.ForwardAddress, x.ForwardUserName, x.ForwardPassword, x.TCPTimeout, x.TCPDeadline, x.UDPDeadline)
if err != nil {
return err
}
if err := client.Negotiate(); err != nil {
return ErrorReply(r, c, err)
}
defer client.TCPConn.Close()
if r.Cmd == socks5.CmdUDP {
// TODO If client's udp address is not 0, then prepare a local udp address
if r.Atyp == socks5.ATYPIPv4 || r.Atyp == socks5.ATYPDomain {
r.DstAddr = net.IPv4zero
} else {
r.DstAddr = net.IPv6zero
}
r.DstPort = []byte{0x00, 0x00}
}
rp, err := client.Request(r)
if err != nil {
return ErrorReply(r, c, err)
}
// reply ok and choose address according to cmd or something wrong
if r.Cmd == socks5.CmdConnect {
a, address, port, err := socks5.ParseAddress(client.TCPConn.LocalAddr().String())
if err != nil {
return ErrorReply(r, c, err)
}
rp.Atyp = a
rp.BndAddr = address
rp.BndPort = port
if err := rp.WriteTo(c); err != nil {
return err
}
// TODO
go func() {
_, _ = io.Copy(c, client.TCPConn)
}()
_, _ = io.Copy(client.TCPConn, c)
return nil
}
if r.Cmd == socks5.CmdUDP {
caddr, err := r.UDP(c, x.Server.ServerAddr)
if err != nil {
return err
}
// Because we always send zero:0 to remote
_, ok := x.Cache.Get("RUA")
if !ok {
x.Cache.Set("RUA", rp.Address(), cache.DefaultExpiration)
}
_, p, err := net.SplitHostPort(caddr.String())
if err != nil {
return err
}
if p == "0" {
time.Sleep(time.Duration(x.Server.UDPSessionTime) * time.Second)
return nil
}
ch := make(chan byte)
x.Server.TCPUDPAssociate.Set(caddr.String(), ch, cache.DefaultExpiration)
<-ch
return nil
}
return ErrorReply(r, c, socks5.ErrUnsupportCmd)
}
// UDPHandle handles udp request
func (x *Socks5Server) UDPHandle(s *socks5.Server, addr *net.UDPAddr, d *socks5.Datagram) error {
if x.Socks5Middleman != nil {
if done, err := x.Socks5Middleman.UDPHandle(s, addr, d); err != nil || done {
return err
}
}
send := func(ue *socks5.UDPExchange, data []byte) error {
_, err := ue.RemoteConn.Write(data)
if err != nil {
return err
}
return nil
}
var ue *socks5.UDPExchange
iue, ok := s.UDPExchanges.Get(addr.String())
if ok {
ue = iue.(*socks5.UDPExchange)
return send(ue, d.Bytes())
}
raddr, ok := x.Cache.Get("RUA")
if !ok {
return errors.New("Can not find remote udp address.")
}
tmp, err := Dial.Dial("udp", raddr.(string))
if err != nil {
v, ok := s.TCPUDPAssociate.Get(addr.String())
if ok {
ch := v.(chan byte)
ch <- 0x00
s.TCPUDPAssociate.Delete(addr.String())
}
return err
}
rc := tmp.(*net.UDPConn)
ue = &socks5.UDPExchange{
ClientAddr: addr,
RemoteConn: rc,
}
if err := send(ue, d.Bytes()); err != nil {
v, ok := s.TCPUDPAssociate.Get(ue.ClientAddr.String())
if ok {
ch := v.(chan byte)
ch <- 0x00
}
ue.RemoteConn.Close()
return err
}
s.UDPExchanges.Set(ue.ClientAddr.String(), ue, cache.DefaultExpiration)
go func(ue *socks5.UDPExchange) {
defer func() {
v, ok := s.TCPUDPAssociate.Get(ue.ClientAddr.String())
if ok {
ch := v.(chan byte)
ch <- 0x00
}
s.UDPExchanges.Delete(ue.ClientAddr.String())
ue.RemoteConn.Close()
}()
var b [65536]byte
for {
if s.UDPDeadline != 0 {
if err := ue.RemoteConn.SetDeadline(time.Now().Add(time.Duration(s.UDPDeadline) * time.Second)); err != nil {
log.Println(err)
break
}
}
n, err := ue.RemoteConn.Read(b[:])
if err != nil {
log.Println(err)
break
}
d1, err := socks5.NewDatagramFromBytes(b[0:n])
if err != nil {
log.Println(err)
break
}
a, addr, port, err := socks5.ParseAddress(ue.ClientAddr.String())
if err != nil {
log.Println(err)
break
}
d1 = socks5.NewDatagram(a, addr, port, d1.Data)
if _, err := s.UDPConn.WriteToUDP(d1.Bytes(), ue.ClientAddr); err != nil {
log.Println(err)
break
}
}
}(ue)
return nil
}
// Shutdown used to stop the client
func (x *Socks5Server) Shutdown() error {
return x.Server.Stop()
}