/
gvisorudpforwarder.go
83 lines (76 loc) · 2.46 KB
/
gvisorudpforwarder.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
package core
import (
"context"
"errors"
"io"
log "github.com/sirupsen/logrus"
"gvisor.dev/gvisor/pkg/tcpip/adapters/gonet"
"gvisor.dev/gvisor/pkg/tcpip/stack"
"gvisor.dev/gvisor/pkg/tcpip/transport/udp"
"gvisor.dev/gvisor/pkg/waiter"
"github.com/wencaiwulue/kubevpn/v2/pkg/config"
)
var GvisorUDPForwardAddr string
func UDPForwarder(s *stack.Stack) func(id stack.TransportEndpointID, pkt *stack.PacketBuffer) bool {
return udp.NewForwarder(s, func(request *udp.ForwarderRequest) {
endpointID := request.ID()
log.Debugf("[TUN-UDP] Debug: LocalPort: %d, LocalAddress: %s, RemotePort: %d, RemoteAddress %s",
endpointID.LocalPort, endpointID.LocalAddress.String(), endpointID.RemotePort, endpointID.RemoteAddress.String(),
)
w := &waiter.Queue{}
endpoint, tErr := request.CreateEndpoint(w)
if tErr != nil {
log.Debugf("[TUN-UDP] Error: can not create endpoint: %v", tErr)
return
}
node, err := ParseNode(GvisorUDPForwardAddr)
if err != nil {
log.Debugf("[TUN-UDP] Error: parse gviosr udp forward addr %s: %v", GvisorUDPForwardAddr, err)
return
}
node.Client = &Client{
Connector: GvisorUDPOverTCPTunnelConnector(endpointID),
Transporter: TCPTransporter(),
}
forwardChain := NewChain(5, node)
ctx := context.Background()
c, err := forwardChain.getConn(ctx)
if err != nil {
log.Debugf("[TUN-UDP] Error: can not get conn: %v", err)
return
}
if err = WriteProxyInfo(c, endpointID); err != nil {
log.Debugf("[TUN-UDP] Error: can not write proxy info: %v", err)
return
}
remote, err := node.Client.ConnectContext(ctx, c)
if err != nil {
log.Debugf("[TUN-UDP] Error: can not connect: %v", err)
return
}
conn := gonet.NewUDPConn(w, endpoint)
go func() {
defer conn.Close()
defer remote.Close()
errChan := make(chan error, 2)
go func() {
i := config.LPool.Get().([]byte)[:]
defer config.LPool.Put(i[:])
written, err2 := io.CopyBuffer(remote, conn, i)
log.Debugf("[TUN-UDP] Debug: write length %d data to remote", written)
errChan <- err2
}()
go func() {
i := config.LPool.Get().([]byte)[:]
defer config.LPool.Put(i[:])
written, err2 := io.CopyBuffer(conn, remote, i)
log.Debugf("[TUN-UDP] Debug: read length %d data from remote", written)
errChan <- err2
}()
err = <-errChan
if err != nil && !errors.Is(err, io.EOF) {
log.Debugf("[TUN-UDP] Error: dsiconnect: %s >-<: %s: %v", conn.LocalAddr(), remote.RemoteAddr(), err)
}
}()
}).HandlePacket
}