frp/cmd/frpc/sub/nathole.go

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// Copyright 2023 The frp Authors
//
// 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 sub
import (
"fmt"
"os"
"github.com/spf13/cobra"
"github.com/fatedier/frp/pkg/config"
"github.com/fatedier/frp/pkg/nathole"
)
var (
natHoleSTUNServer string
natHoleLocalAddr string
)
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func init() {
RegisterCommonFlags(natholeCmd)
rootCmd.AddCommand(natholeCmd)
natholeCmd.AddCommand(natholeDiscoveryCmd)
natholeCmd.PersistentFlags().StringVarP(&natHoleSTUNServer, "nat_hole_stun_server", "", "", "STUN server address for nathole")
natholeCmd.PersistentFlags().StringVarP(&natHoleLocalAddr, "nat_hole_local_addr", "l", "", "local address to connect STUN server")
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}
var natholeCmd = &cobra.Command{
Use: "nathole",
Short: "Actions about nathole",
}
var natholeDiscoveryCmd = &cobra.Command{
Use: "discover",
Short: "Discover nathole information from stun server",
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RunE: func(cmd *cobra.Command, args []string) error {
// ignore error here, because we can use command line pameters
cfg, _, _, err := config.ParseClientConfig(cfgFile)
if err != nil {
cfg = config.GetDefaultClientConf()
}
if natHoleSTUNServer != "" {
cfg.NatHoleSTUNServer = natHoleSTUNServer
}
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if err := validateForNatHoleDiscovery(cfg); err != nil {
fmt.Println(err)
os.Exit(1)
}
addrs, localAddr, err := nathole.Discover([]string{cfg.NatHoleSTUNServer}, natHoleLocalAddr)
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if err != nil {
fmt.Println("discover error:", err)
os.Exit(1)
}
if len(addrs) < 2 {
fmt.Printf("discover error: can not get enough addresses, need 2, got: %v\n", addrs)
os.Exit(1)
}
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localIPs, _ := nathole.ListLocalIPsForNatHole(10)
natFeature, err := nathole.ClassifyNATFeature(addrs, localIPs)
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if err != nil {
fmt.Println("classify nat feature error:", err)
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os.Exit(1)
}
fmt.Println("STUN server:", cfg.NatHoleSTUNServer)
fmt.Println("Your NAT type is:", natFeature.NatType)
fmt.Println("Behavior is:", natFeature.Behavior)
fmt.Println("External address is:", addrs)
fmt.Println("Local address is:", localAddr.String())
fmt.Println("Public Network:", natFeature.PublicNetwork)
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return nil
},
}
func validateForNatHoleDiscovery(cfg config.ClientCommonConf) error {
if cfg.NatHoleSTUNServer == "" {
return fmt.Errorf("nat_hole_stun_server can not be empty")
}
return nil
}