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package udp
import (
"fmt"
"v2ray.com/core/common/net"
)
type Server struct {
Port net.Port
MsgProcessor func(msg []byte) []byte
accepting bool
conn *net.UDPConn
}
func (server *Server) Start() (net.Destination, error) {
conn, err := net.ListenUDP("udp", &net.UDPAddr{
IP: []byte{127, 0, 0, 1},
Port: int(server.Port),
Zone: "",
})
if err != nil {
return net.Destination{}, err
}
server.Port = net.Port(conn.LocalAddr().(*net.UDPAddr).Port)
fmt.Println("UDP server started on port ", server.Port)
server.conn = conn
go server.handleConnection(conn)
localAddr := conn.LocalAddr().(*net.UDPAddr)
return net.UDPDestination(net.IPAddress(localAddr.IP), net.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])
if _, err := conn.WriteToUDP(response, addr); err != nil {
fmt.Println("Failed to write to UDP: ", err.Error())
}
}
}
func (server *Server) Close() error {
server.accepting = false
return server.conn.Close()
}
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