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71029cea2d
This updates all source files to use a new standard header for copyright and license declaration. Notably, copyright no longer includes a date, and we now use the standard SPDX-License-Identifier header. This commit was done almost entirely mechanically with perl, and then some minimal manual fixes. Updates #6865 Signed-off-by: Will Norris <will@tailscale.com>
58 lines
1.0 KiB
Go
58 lines
1.0 KiB
Go
// Copyright (c) Tailscale Inc & AUTHORS
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// SPDX-License-Identifier: BSD-3-Clause
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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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