forked from v2fly/v2ray-core
-
Notifications
You must be signed in to change notification settings - Fork 29
/
listener.go
304 lines (264 loc) · 6.58 KB
/
listener.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
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
package kcp
import (
"crypto/cipher"
"crypto/tls"
"io"
"net"
"sync"
"time"
"v2ray.com/core/app/log"
"v2ray.com/core/common"
"v2ray.com/core/common/buf"
"v2ray.com/core/common/errors"
v2net "v2ray.com/core/common/net"
"v2ray.com/core/transport/internet"
"v2ray.com/core/transport/internet/internal"
v2tls "v2ray.com/core/transport/internet/tls"
"v2ray.com/core/transport/internet/udp"
)
type ConnectionID struct {
Remote v2net.Address
Port v2net.Port
Conv uint16
}
type ServerConnection struct {
id internal.ConnectionID
local net.Addr
remote net.Addr
writer PacketWriter
closer io.Closer
}
func (o *ServerConnection) Overhead() int {
return o.writer.Overhead()
}
func (o *ServerConnection) Read([]byte) (int, error) {
panic("KCP|ServerConnection: Read should not be called.")
}
func (o *ServerConnection) Write(b []byte) (int, error) {
return o.writer.Write(b)
}
func (o *ServerConnection) Close() error {
return o.closer.Close()
}
func (o *ServerConnection) Reset(input func([]Segment)) {
}
func (o *ServerConnection) LocalAddr() net.Addr {
return o.local
}
func (o *ServerConnection) RemoteAddr() net.Addr {
return o.remote
}
func (o *ServerConnection) SetDeadline(time.Time) error {
return nil
}
func (o *ServerConnection) SetReadDeadline(time.Time) error {
return nil
}
func (o *ServerConnection) SetWriteDeadline(time.Time) error {
return nil
}
func (o *ServerConnection) Id() internal.ConnectionID {
return o.id
}
// Listener defines a server listening for connections
type Listener struct {
sync.Mutex
closed chan bool
sessions map[ConnectionID]*Connection
awaitingConns chan *Connection
hub *udp.Hub
tlsConfig *tls.Config
config *Config
reader PacketReader
header internet.PacketHeader
security cipher.AEAD
}
func NewListener(address v2net.Address, port v2net.Port, options internet.ListenOptions) (*Listener, error) {
networkSettings, err := options.Stream.GetEffectiveTransportSettings()
if err != nil {
log.Error("KCP|Listener: Failed to get KCP settings: ", err)
return nil, err
}
kcpSettings := networkSettings.(*Config)
kcpSettings.ConnectionReuse = &ConnectionReuse{Enable: false}
header, err := kcpSettings.GetPackerHeader()
if err != nil {
return nil, errors.Base(err).Message("KCP|Listener: Failed to create packet header.")
}
security, err := kcpSettings.GetSecurity()
if err != nil {
return nil, errors.Base(err).Message("KCP|Listener: Failed to create security.")
}
l := &Listener{
header: header,
security: security,
reader: &KCPPacketReader{
Header: header,
Security: security,
},
sessions: make(map[ConnectionID]*Connection),
awaitingConns: make(chan *Connection, 64),
closed: make(chan bool),
config: kcpSettings,
}
if options.Stream != nil && options.Stream.HasSecuritySettings() {
securitySettings, err := options.Stream.GetEffectiveSecuritySettings()
if err != nil {
log.Error("KCP|Listener: Failed to get security settings: ", err)
return nil, err
}
switch securitySettings := securitySettings.(type) {
case *v2tls.Config:
l.tlsConfig = securitySettings.GetTLSConfig()
}
}
hub, err := udp.ListenUDP(address, port, udp.ListenOption{Callback: l.OnReceive, Concurrency: 2})
if err != nil {
return nil, err
}
l.Lock()
l.hub = hub
l.Unlock()
log.Info("KCP|Listener: listening on ", address, ":", port)
return l, nil
}
func (v *Listener) OnReceive(payload *buf.Buffer, src v2net.Destination, originalDest v2net.Destination) {
defer payload.Release()
segments := v.reader.Read(payload.Bytes())
if len(segments) == 0 {
log.Info("KCP|Listener: discarding invalid payload from ", src)
return
}
select {
case <-v.closed:
return
default:
}
v.Lock()
defer v.Unlock()
if v.hub == nil {
return
}
if payload.Len() < 4 {
return
}
conv := segments[0].Conversation()
cmd := segments[0].Command()
id := ConnectionID{
Remote: src.Address,
Port: src.Port,
Conv: conv,
}
conn, found := v.sessions[id]
if !found {
if cmd == CommandTerminate {
return
}
writer := &Writer{
id: id,
hub: v.hub,
dest: src,
listener: v,
}
remoteAddr := &net.UDPAddr{
IP: src.Address.IP(),
Port: int(src.Port),
}
localAddr := v.hub.Addr()
sConn := &ServerConnection{
id: internal.NewConnectionID(v2net.LocalHostIP, src),
local: localAddr,
remote: remoteAddr,
writer: &KCPPacketWriter{
Header: v.header,
Writer: writer,
Security: v.security,
},
closer: writer,
}
conn = NewConnection(conv, sConn, v, v.config)
select {
case v.awaitingConns <- conn:
case <-time.After(time.Second * 5):
conn.Close()
return
}
v.sessions[id] = conn
}
conn.Input(segments)
}
func (v *Listener) Remove(id ConnectionID) {
select {
case <-v.closed:
return
default:
v.Lock()
delete(v.sessions, id)
v.Unlock()
}
}
// Accept implements the Accept method in the Listener interface; it waits for the next call and returns a generic Conn.
func (v *Listener) Accept() (internet.Connection, error) {
for {
select {
case <-v.closed:
return nil, ErrClosedListener
case conn, open := <-v.awaitingConns:
if !open {
break
}
if v.tlsConfig != nil {
tlsConn := tls.Server(conn, v.tlsConfig)
return UnreusableConnection{Conn: tlsConn}, nil
}
return conn, nil
case <-time.After(time.Second):
}
}
}
// Close stops listening on the UDP address. Already Accepted connections are not closed.
func (v *Listener) Close() error {
v.Lock()
defer v.Unlock()
select {
case <-v.closed:
return ErrClosedListener
default:
}
close(v.closed)
close(v.awaitingConns)
for _, conn := range v.sessions {
go conn.Terminate()
}
v.hub.Close()
return nil
}
func (v *Listener) ActiveConnections() int {
v.Lock()
defer v.Unlock()
return len(v.sessions)
}
// Addr returns the listener's network address, The Addr returned is shared by all invocations of Addr, so do not modify it.
func (v *Listener) Addr() net.Addr {
return v.hub.Addr()
}
func (v *Listener) Put(internal.ConnectionID, net.Conn) {}
type Writer struct {
id ConnectionID
dest v2net.Destination
hub *udp.Hub
listener *Listener
}
func (v *Writer) Write(payload []byte) (int, error) {
return v.hub.WriteTo(payload, v.dest)
}
func (v *Writer) Close() error {
v.listener.Remove(v.id)
return nil
}
func ListenKCP(address v2net.Address, port v2net.Port, options internet.ListenOptions) (internet.Listener, error) {
return NewListener(address, port, options)
}
func init() {
common.Must(internet.RegisterTransportListener(internet.TransportProtocol_MKCP, ListenKCP))
}