mirror of
https://github.com/tailscale/tailscale.git
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59 lines
1.1 KiB
Go
59 lines
1.1 KiB
Go
// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Command stunc makes a STUN request to a STUN server and prints the result.
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package main
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import (
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"log"
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"net"
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"os"
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"tailscale.com/net/stun"
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)
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func main() {
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log.SetFlags(0)
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if len(os.Args) != 2 {
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log.Fatalf("usage: %s <hostname>", os.Args[0])
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}
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host := os.Args[1]
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uaddr, err := net.ResolveUDPAddr("udp", host+":3478")
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if err != nil {
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log.Fatal(err)
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}
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c, err := net.ListenUDP("udp", nil)
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if err != nil {
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log.Fatal(err)
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}
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txID := stun.NewTxID()
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req := stun.Request(txID)
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_, err = c.WriteToUDP(req, uaddr)
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if err != nil {
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log.Fatal(err)
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}
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var buf [1024]byte
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n, raddr, err := c.ReadFromUDPAddrPort(buf[:])
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if err != nil {
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log.Fatal(err)
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}
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tid, saddr, err := stun.ParseResponse(buf[:n])
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if err != nil {
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log.Fatal(err)
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}
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if tid != txID {
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log.Fatalf("txid mismatch: got %v, want %v", tid, txID)
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}
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log.Printf("sent addr: %v", uaddr)
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log.Printf("from addr: %v", raddr)
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log.Printf("stun addr: %v", saddr)
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}
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