frp/pkg/util/net/kcp.go

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// Copyright 2017 fatedier, fatedier@gmail.com
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package net
import (
"fmt"
"net"
kcp "github.com/xtaci/kcp-go/v5"
)
type KCPListener struct {
listener net.Listener
acceptCh chan net.Conn
closeFlag bool
}
func ListenKcp(address string) (l *KCPListener, err error) {
listener, err := kcp.ListenWithOptions(address, nil, 10, 3)
if err != nil {
return l, err
}
_ = listener.SetReadBuffer(4194304)
_ = listener.SetWriteBuffer(4194304)
l = &KCPListener{
listener: listener,
acceptCh: make(chan net.Conn),
closeFlag: false,
}
go func() {
for {
conn, err := listener.AcceptKCP()
if err != nil {
if l.closeFlag {
close(l.acceptCh)
return
}
continue
}
// No need to call SetStreamMode stream mode is now default
conn.SetWriteDelay(true)
conn.SetNoDelay(1, 20, 2, 1)
conn.SetMtu(1350)
conn.SetWindowSize(1024, 1024)
conn.SetACKNoDelay(false)
l.acceptCh <- conn
}
}()
return l, err
}
func (l *KCPListener) Accept() (net.Conn, error) {
conn, ok := <-l.acceptCh
if !ok {
return conn, fmt.Errorf("channel for kcp listener closed")
}
return conn, nil
}
func (l *KCPListener) Close() error {
if !l.closeFlag {
l.closeFlag = true
l.listener.Close()
}
return nil
}
func (l *KCPListener) Addr() net.Addr {
return l.listener.Addr()
}
func NewKCPConnFromUDP(conn *net.UDPConn, connected bool, raddr string) (net.Conn, error) {
udpAddr, err := net.ResolveUDPAddr("udp", raddr)
if err != nil {
return nil, err
}
var pConn net.PacketConn = conn
if connected {
pConn = &ConnectedUDPConn{conn}
}
kcpConn, err := kcp.NewConn3(1, udpAddr, nil, 10, 3, pConn)
if err != nil {
return nil, err
}
// No need to call SetStreamMode stream mode is now default
kcpConn.SetWriteDelay(true)
kcpConn.SetNoDelay(1, 20, 2, 1)
kcpConn.SetMtu(1350)
kcpConn.SetWindowSize(1024, 1024)
kcpConn.SetACKNoDelay(false)
return kcpConn, nil
}