extip

README

extip

Go package which retrieves external IP address using STUN servers

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Usage

Example:

package main

import (
    "fmt"
    "github.com/Snawoot/extip"
    "context"
    "os"
    "time"
)

func main() {
    ctx, _ := context.WithTimeout(context.Background(), 3 * time.Second)
    ip, err := extip.QueryMultipleServers(ctx, nil, 2, false)
    if err != nil {
        switch res := err.(type) {
        case extip.InconclusiveResult:
            fmt.Fprintf(os.Stderr, "Inconclusive result:\n")
            fmt.Fprintf(os.Stderr, "Required quorum = %v\n", res.Quorum)
            for k, v := range res.Results {
                fmt.Fprintf(os.Stderr, "Server %s responded: %s\n", k, v)
            }
            for k, v := range res.Errors {
                fmt.Fprintf(os.Stderr, "Server %s failed: %v\n", k, v)
            }
        default:
            fmt.Fprintf(os.Stderr, "Error: %v\n", err)
        }
        return
    }
    fmt.Println(ip)
}

See GoDoc and sources for more details.

Documentation

Index

• Variables
• func QueryMultipleServers(ctx context.Context, servers []string, quorum uint, ipv6 bool) (string, error)
• func QuerySingleServer(ctx context.Context, server string, ipv6 bool) (string, error)
• type InconclusiveResult
  • func (_ InconclusiveResult) Error() string

Variables

var PublicServerList = []string{
	"stun.l.google.com:19302",
	"stun.ekiga.net:3478",
	"stun.schlund.de:3478",
	"stun.voiparound.com:3478",
	"stun.voipbuster.com:3478",
	"stun.voipstunt.com:3478",
}

Functions

func QueryMultipleServers

func QueryMultipleServers(ctx context.Context, servers []string, quorum uint, ipv6 bool) (string, error)

Query multiple servers and determine result by quorum of successful responses. List of servers can be a nil slice. In this case public server list will be used. Recommended quorum value is 2.

func QuerySingleServer

func QuerySingleServer(ctx context.Context, server string, ipv6 bool) (string, error)

Query external IP address from single server

Types

type InconclusiveResult

type InconclusiveResult struct {
	// Map with error for each failed server
	Errors map[string]error

	// Map with result for each server
	Results map[string]string

	// Quorum set for matching responses
	Quorum uint
}

func (InconclusiveResult) Error

func (_ InconclusiveResult) Error() string