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125 lines
3.3 KiB
Go
125 lines
3.3 KiB
Go
package net
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import (
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"b612.me/starlog"
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"context"
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"fmt"
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"net"
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"strings"
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"sync/atomic"
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)
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type NatTesterServer struct {
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MainPort string
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AltPort string
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MainIP string
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AltIP string
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LogPath string
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stopCtx context.Context
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stopFn context.CancelFunc
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maina *net.UDPConn
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mainb *net.UDPConn
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alt *net.UDPConn
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running int32
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}
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func (n *NatTesterServer) Run() error {
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if atomic.LoadInt32(&n.running) > 0 {
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starlog.Errorln("already running")
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return fmt.Errorf("already running")
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}
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atomic.StoreInt32(&n.running, 1)
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defer atomic.StoreInt32(&n.running, 0)
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if n.LogPath != "" {
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starlog.SetLogFile(n.LogPath, starlog.Std, true)
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starlog.Infof("Log file set to %s\n", n.LogPath)
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}
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starlog.Infof("MainPort: %s\n", n.MainPort)
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starlog.Infof("AltPort: %s\n", n.AltPort)
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tmp, err := net.Dial("udp", "8.8.8.8:53")
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if err != nil {
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return err
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}
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starlog.Infof("Current Output IP: %s\n", tmp.LocalAddr().(*net.UDPAddr).IP.String())
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tmp.Close()
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n.stopCtx, n.stopFn = context.WithCancel(context.Background())
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mainaaddr, err := net.ResolveUDPAddr("udp", n.MainIP+":"+n.MainPort)
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if err != nil {
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return err
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}
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mainbaddr, err := net.ResolveUDPAddr("udp", n.MainIP+":"+n.AltPort)
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if err != nil {
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return err
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}
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n.maina, err = net.ListenUDP("udp", mainaaddr)
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if err != nil {
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return err
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}
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starlog.Infof("UDP MainIP:MainPort Listening on %s\n", n.maina.LocalAddr().String())
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n.mainb, err = net.ListenUDP("udp", mainbaddr)
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if err != nil {
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return err
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}
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starlog.Infof("UDP MainIP:AltPort Listening on %s\n", n.mainb.LocalAddr().String())
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altaddr, err := net.ResolveUDPAddr("udp", n.AltIP+":"+n.AltPort)
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if err != nil {
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return err
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}
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n.alt, err = net.ListenUDP("udp", altaddr)
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if err != nil {
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return err
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}
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starlog.Infof("UDP AltIP:AltPort Listening on %s\n", n.alt.LocalAddr().String())
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go func() {
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for {
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select {
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case <-n.stopCtx.Done():
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starlog.Infoln("Stopping,Reason: Context Done")
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return
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default:
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}
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buf := make([]byte, 1024)
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num, r, e := n.alt.ReadFromUDP(buf)
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if e != nil {
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continue
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}
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go n.Analyse(n.alt, r, strings.Split(string(buf[:num]), "::"))
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}
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}()
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for {
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select {
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case <-n.stopCtx.Done():
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starlog.Infoln("Stopping,Reason: Context Done")
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n.maina.Close()
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n.mainb.Close()
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n.alt.Close()
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return nil
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default:
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}
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buf := make([]byte, 1024)
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num, r, e := n.maina.ReadFromUDP(buf)
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if e != nil {
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continue
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}
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go n.Analyse(n.maina, r, strings.Split(string(buf[:num]), "::"))
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}
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}
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func (n *NatTesterServer) Analyse(c *net.UDPConn, r *net.UDPAddr, cmds []string) error {
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switch cmds[0] {
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case "ip":
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c.WriteToUDP([]byte("ip::"+r.String()), r)
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starlog.Infof("Recv IP Request from %s,Local: %s\n", r.String(), c.LocalAddr().String())
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case "startnat1":
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n.alt.WriteToUDP([]byte("stage1"), r)
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starlog.Infof("Start NAT1 Test from %s,Recv Local:%s Send Local:%s\n", r.String(), c.LocalAddr().String(), n.alt.LocalAddr().String())
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case "startnat2":
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n.mainb.WriteToUDP([]byte("stage2"), r)
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starlog.Infof("Start NAT2 Test from %s,Recv Local:%s Send Local:%s\n", r.String(), c.LocalAddr().String(), n.mainb.LocalAddr().String())
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case "startnat3":
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n.maina.WriteToUDP([]byte("stage3"), r)
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starlog.Infof("Start NAT3 Test from %s,Recv Local:%s Send Local:%s\n", r.String(), c.LocalAddr().String(), n.maina.LocalAddr().String())
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}
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return nil
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}
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