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// Copyright 2016 Cong Ding
//
// 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 main
import (
"flag"
"fmt"
"github.com/ccding/go-stun/stun"
)
func main() {
var serverAddr = flag.String("s", stun.DefaultServerAddr, "STUN server address")
var v = flag.Bool("v", false, "verbose mode")
var vv = flag.Bool("vv", false, "double verbose mode (includes -v)")
var vvv = flag.Bool("vvv", false, "triple verbose mode (includes -v and -vv)")
flag.Parse()
// Creates a STUN client. NewClientWithConnection can also be used if you want to handle the UDP listener by yourself.
client := stun.NewClient()
// The default addr (stun.DefaultServerAddr) will be used unless we call SetServerAddr.
client.SetServerAddr(*serverAddr)
// Non verbose mode will be used by default unless we call SetVerbose(true) or SetVVerbose(true).
client.SetVerbose(*v || *vv || *vvv)
client.SetVVerbose(*vv || *vvv)
// Discover the NAT and return the result.
nat, host, err := client.Discover()
if err != nil {
fmt.Println(err)
return
}
fmt.Println("NAT Type:", nat)
if host != nil {
fmt.Println("External IP Family:", host.Family())
fmt.Println("External IP:", host.IP())
fmt.Println("External Port:", host.Port())
}
}
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