-
Notifications
You must be signed in to change notification settings - Fork 413
/
bind.go
138 lines (117 loc) · 2.96 KB
/
bind.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
package bind
import (
"fmt"
"net"
"runtime"
"sync"
"github.com/pion/stun/v2"
"github.com/pion/transport/v3"
log "github.com/sirupsen/logrus"
"golang.org/x/net/ipv4"
wgConn "golang.zx2c4.com/wireguard/conn"
)
type receiverCreator struct {
iceBind *ICEBind
}
func (rc receiverCreator) CreateIPv4ReceiverFn(msgPool *sync.Pool, pc *ipv4.PacketConn, conn *net.UDPConn) wgConn.ReceiveFunc {
return rc.iceBind.createIPv4ReceiverFn(msgPool, pc, conn)
}
type ICEBind struct {
*wgConn.StdNetBind
muUDPMux sync.Mutex
transportNet transport.Net
udpMux *UniversalUDPMuxDefault
}
func NewICEBind(transportNet transport.Net) *ICEBind {
ib := &ICEBind{
transportNet: transportNet,
}
rc := receiverCreator{
ib,
}
ib.StdNetBind = wgConn.NewStdNetBindWithReceiverCreator(rc)
return ib
}
// GetICEMux returns the ICE UDPMux that was created and used by ICEBind
func (s *ICEBind) GetICEMux() (*UniversalUDPMuxDefault, error) {
s.muUDPMux.Lock()
defer s.muUDPMux.Unlock()
if s.udpMux == nil {
return nil, fmt.Errorf("ICEBind has not been initialized yet")
}
return s.udpMux, nil
}
func (s *ICEBind) createIPv4ReceiverFn(ipv4MsgsPool *sync.Pool, pc *ipv4.PacketConn, conn *net.UDPConn) wgConn.ReceiveFunc {
s.muUDPMux.Lock()
defer s.muUDPMux.Unlock()
s.udpMux = NewUniversalUDPMuxDefault(
UniversalUDPMuxParams{
UDPConn: conn,
Net: s.transportNet,
},
)
return func(bufs [][]byte, sizes []int, eps []wgConn.Endpoint) (n int, err error) {
msgs := ipv4MsgsPool.Get().(*[]ipv4.Message)
defer ipv4MsgsPool.Put(msgs)
for i := range bufs {
(*msgs)[i].Buffers[0] = bufs[i]
}
var numMsgs int
if runtime.GOOS == "linux" {
numMsgs, err = pc.ReadBatch(*msgs, 0)
if err != nil {
return 0, err
}
} else {
msg := &(*msgs)[0]
msg.N, msg.NN, _, msg.Addr, err = conn.ReadMsgUDP(msg.Buffers[0], msg.OOB)
if err != nil {
return 0, err
}
numMsgs = 1
}
for i := 0; i < numMsgs; i++ {
msg := &(*msgs)[i]
// todo: handle err
ok, _ := s.filterOutStunMessages(msg.Buffers, msg.N, msg.Addr)
if ok {
sizes[i] = 0
} else {
sizes[i] = msg.N
}
addrPort := msg.Addr.(*net.UDPAddr).AddrPort()
ep := &wgConn.StdNetEndpoint{AddrPort: addrPort} // TODO: remove allocation
wgConn.GetSrcFromControl(msg.OOB[:msg.NN], ep)
eps[i] = ep
}
return numMsgs, nil
}
}
func (s *ICEBind) filterOutStunMessages(buffers [][]byte, n int, addr net.Addr) (bool, error) {
for i := range buffers {
if !stun.IsMessage(buffers[i]) {
continue
}
msg, err := s.parseSTUNMessage(buffers[i][:n])
if err != nil {
buffers[i] = []byte{}
return true, err
}
muxErr := s.udpMux.HandleSTUNMessage(msg, addr)
if muxErr != nil {
log.Warnf("failed to handle STUN packet")
}
buffers[i] = []byte{}
return true, nil
}
return false, nil
}
func (s *ICEBind) parseSTUNMessage(raw []byte) (*stun.Message, error) {
msg := &stun.Message{
Raw: raw,
}
if err := msg.Decode(); err != nil {
return nil, err
}
return msg, nil
}