Auto detect public IPs if not provided by user

adopted code from anacrolix/confluence 3c7a0c445d

server/go.mod

@@ -12,6 +12,7 @@ require (
 	github.com/anacrolix/dms v1.4.0
 	github.com/anacrolix/log v0.13.1
 	github.com/anacrolix/missinggo v1.3.0
+	github.com/anacrolix/publicip v0.2.0
 	github.com/anacrolix/torrent v1.43.1
 	github.com/gin-contrib/cors v1.3.1
 	github.com/gin-contrib/location v0.0.2

server/go.sum

@@ -66,6 +66,8 @@ github.com/anacrolix/mmsg v1.0.0 h1:btC7YLjOn29aTUAExJiVUhQOuf/8rhm+/nWCMAnL3Hg=
 github.com/anacrolix/mmsg v1.0.0/go.mod h1:x8kRaJY/dCrY9Al0PEcj1mb/uFHwP6GCJ9fLl4thEPc=
 github.com/anacrolix/multiless v0.3.0 h1:5Bu0DZncjE4e06b9r1Ap2tUY4Au0NToBP5RpuEngSis=
 github.com/anacrolix/multiless v0.3.0/go.mod h1:TrCLEZfIDbMVfLoQt5tOoiBS/uq4y8+ojuEVVvTNPX4=
+github.com/anacrolix/publicip v0.2.0 h1:n/BmRxXRlOT/wQFd6Xhu57r9uTU+Xvb9MyEkLooh3TU=
+github.com/anacrolix/publicip v0.2.0/go.mod h1:67G1lVkLo8UjdEcJkwScWVTvlJ35OCDsRJoWXl/wi4g=
 github.com/anacrolix/stm v0.2.0/go.mod h1:zoVQRvSiGjGoTmbM0vSLIiaKjWtNPeTvXUSdJQA4hsg=
 github.com/anacrolix/stm v0.3.0 h1:peQncJSNJtk1YBrFbW0DLKYqll+sa0kOk8EvXRcO+wA=
 github.com/anacrolix/stm v0.3.0/go.mod h1:spImf/rXwiAUoYYJK1YCZeWkpaHZ3kzjGFjwK5OStfU=

server/torr/btserver.go

@@ -1,12 +1,14 @@
 package torr
 
 import (
+	"context"
 	"fmt"
 	"log"
 	"net"
 	"strconv"
 	"sync"
 
+	"github.com/anacrolix/publicip"
 	"github.com/anacrolix/torrent"
 	"github.com/anacrolix/torrent/metainfo"
 
@@ -58,7 +60,7 @@ func (bt *BTServer) Connect() error {
 	bt.mu.Lock()
 	defer bt.mu.Unlock()
 	var err error
-	bt.configure()
+	bt.configure(context.TODO())
 	bt.client, err = torrent.NewClient(bt.config)
 	bt.torrents = make(map[metainfo.Hash]*Torrent)
 	InitApiHelper(bt)
@@ -75,7 +77,7 @@ func (bt *BTServer) Disconnect() {
 	}
 }
 
-func (bt *BTServer) configure() {
+func (bt *BTServer) configure(ctx context.Context) (err error) {
 	blocklist, _ := utils.ReadBlockedIP()
 	bt.config = torrent.NewDefaultClientConfig()
 
@@ -147,7 +149,10 @@ func (bt *BTServer) configure() {
 		}
 	}
 	if bt.config.PublicIp4 == nil {
-		bt.config.PublicIp4 = getPublicIp4()
+		bt.config.PublicIp4, err = publicip.Get4(ctx)
+		if err != nil {
+			log.Printf("error getting public ipv4 address: %v", err)
+		}
 	}
 	if bt.config.PublicIp4 != nil {
 		log.Println("PublicIp4:", bt.config.PublicIp4)
@@ -160,11 +165,15 @@ func (bt *BTServer) configure() {
 		}
 	}
 	if bt.config.PublicIp6 == nil {
-		bt.config.PublicIp6 = getPublicIp6()
+		bt.config.PublicIp6, err = publicip.Get6(ctx)
+		if err != nil {
+			log.Printf("error getting public ipv6 address: %v", err)
+		}
 	}
 	if bt.config.PublicIp6 != nil {
 		log.Println("PublicIp6:", bt.config.PublicIp6)
 	}
+	return err
 }
 
 func (bt *BTServer) GetTorrent(hash torrent.InfoHash) *Torrent {

server/web/server.go

@@ -30,7 +30,7 @@ func Start(port string) {
 	log.TLogln("Start TorrServer")
 	ips := getLocalIps()
 	if len(ips) > 0 {
-		log.TLogln("IPs:", ips)
+		log.TLogln("Local IPs:", ips)
 	}
 	err := BTS.Connect()
 	if err != nil {
@@ -102,7 +102,7 @@ func getLocalIps() []string {
 				case *net.IPAddr:
 					ip = v.IP
 				}
-				if !ip.IsLoopback() {
+				if !ip.IsLoopback() && !ip.IsLinkLocalUnicast() && !ip.IsLinkLocalMulticast() {
 					list = append(list, ip.String())
 				}
 			}