package udp
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import (
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"fmt"
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"github.com/v2fly/v2ray-core/v5/common/net"
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)
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type Server struct {
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Port net.Port
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MsgProcessor func(msg []byte) []byte
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accepting bool
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conn *net.UDPConn
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}
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func (server *Server) Start() (net.Destination, error) {
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conn, err := net.ListenUDP("udp", &net.UDPAddr{
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IP: []byte{127, 0, 0, 1},
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Port: int(server.Port),
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Zone: "",
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})
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if err != nil {
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return net.Destination{}, err
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}
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server.Port = net.Port(conn.LocalAddr().(*net.UDPAddr).Port)
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fmt.Println("UDP server started on port ", server.Port)
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server.conn = conn
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go server.handleConnection(conn)
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localAddr := conn.LocalAddr().(*net.UDPAddr)
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return net.UDPDestination(net.IPAddress(localAddr.IP), net.Port(localAddr.Port)), nil
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}
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func (server *Server) handleConnection(conn *net.UDPConn) {
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server.accepting = true
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for server.accepting {
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buffer := make([]byte, 2*1024)
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nBytes, addr, err := conn.ReadFromUDP(buffer)
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if err != nil {
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fmt.Printf("Failed to read from UDP: %v\n", err)
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continue
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}
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response := server.MsgProcessor(buffer[:nBytes])
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if _, err := conn.WriteToUDP(response, addr); err != nil {
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fmt.Println("Failed to write to UDP: ", err.Error())
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}
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}
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}
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func (server *Server) Close() error {
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server.accepting = false
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return server.conn.Close()
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}
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