Fixed private ip lookup

Signed-off-by: Vishal Rana <vr@labstack.com>

Makefile

@@ -1,5 +1,5 @@
 IMAGE = labstack/armor
-VERSION = 0.4.9
+VERSION = 0.4.10
 
 run:
 	go run cmd/armor/main.go

armor.go

@@ -92,7 +92,7 @@ type (
 )
 
 const (
-	Version = "0.4.9"
+	Version = "0.4.10"
 	Website = "https://armor.labstack.com"
 )
 

http.go

@@ -99,7 +99,7 @@ func (h *HTTP) Start() error {
 	e := h.echo
 	if a.DefaultConfig {
 		a.Colorer.Printf("⇨ serving from %s (Local)\n", a.Colorer.Green("http://localhost"+a.Address))
-		ip := util.GetPrivateIP()
+		ip := util.PrivateIP()
 		if ip != "" {
 			_, port, _ := net.SplitHostPort(a.Address)
 			a.Colorer.Printf("⇨ serving from %s (Intranet)\n", a.Colorer.Green(fmt.Sprintf("http://%s:%s", ip, port)))

util/util.go

@@ -24,15 +24,22 @@ func StripPort(host string) string {
 	return host[:colon]
 }
 
-func GetPrivateIP() string {
+func PrivateIP() string {
 	addrs, err := net.InterfaceAddrs()
 	if err != nil {
 		return ""
 	}
 	for _, address := range addrs {
 		if ipNet, ok := address.(*net.IPNet); ok && !ipNet.IP.IsLoopback() {
 			if ipNet.IP.To4() != nil {
-				return ipNet.IP.String()
+				ip := ipNet.IP
+				_, cidr24BitBlock, _ := net.ParseCIDR("10.0.0.0/8")
+				_, cidr20BitBlock, _ := net.ParseCIDR("172.16.0.0/12")
+				_, cidr16BitBlock, _ := net.ParseCIDR("192.168.0.0/16")
+				private := cidr24BitBlock.Contains(ip) || cidr20BitBlock.Contains(ip) || cidr16BitBlock.Contains(ip)
+				if private {
+					return ip.String()
+				}
 			}
 		}
 	}

website/content/guide.md

@@ -44,7 +44,7 @@ Type `armor` in your terminal
    ___
   / _ | ______ _  ___  ____
  / __ |/ __/  ' \/ _ \/ __/
-/_/ |_/_/ /_/_/_/\___/_/    v0.4.9
+/_/ |_/_/ /_/_/_/\___/_/    v0.4.10
 
 Uncomplicated, modern HTTP server
 https://armor.labstack.com