-
Notifications
You must be signed in to change notification settings - Fork 4.6k
/
udp.go
50 lines (43 loc) · 1.06 KB
/
udp.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
package udp
import (
"fmt"
"net"
v2net "github.com/v2ray/v2ray-core/common/net"
)
type Server struct {
Port v2net.Port
MsgProcessor func(msg []byte) []byte
accepting bool
conn *net.UDPConn
}
func (server *Server) Start() (v2net.Destination, error) {
conn, err := net.ListenUDP("udp", &net.UDPAddr{
IP: []byte{127, 0, 0, 1},
Port: int(server.Port),
Zone: "",
})
if err != nil {
return nil, err
}
server.conn = conn
go server.handleConnection(conn)
localAddr := conn.LocalAddr().(*net.UDPAddr)
return v2net.UDPDestination(v2net.IPAddress(localAddr.IP), v2net.Port(localAddr.Port)), nil
}
func (server *Server) handleConnection(conn *net.UDPConn) {
server.accepting = true
for server.accepting {
buffer := make([]byte, 2*1024)
nBytes, addr, err := conn.ReadFromUDP(buffer)
if err != nil {
fmt.Printf("Failed to read from UDP: %v\n", err)
continue
}
response := server.MsgProcessor(buffer[:nBytes])
conn.WriteToUDP(response, addr)
}
}
func (server *Server) Close() {
server.accepting = false
server.conn.Close()
}