From cb7084c0833c1fb4ce99345933595b3d7e69e014 Mon Sep 17 00:00:00 2001
From: Will Scott <will@cypherpunk.email>
Date: Sun, 8 Mar 2020 13:08:23 -0700
Subject: [PATCH] skip v6 test when no v6 interface

---
 netroute_linux.go |  2 +-
 netroute_test.go  | 13 +++++++++++++
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/netroute_linux.go b/netroute_linux.go
index 18c691c..203efb8 100644
--- a/netroute_linux.go
+++ b/netroute_linux.go
@@ -29,5 +29,5 @@ func New() (routing.Router, error) {
 	if err != nil {
 		return nil, err
 	}
-	return router{r}, nil
+	return &router{r}, nil
 }
diff --git a/netroute_test.go b/netroute_test.go
index 1ad8bac..0aeffbd 100644
--- a/netroute_test.go
+++ b/netroute_test.go
@@ -18,6 +18,7 @@ func TestRoute(t *testing.T) {
 	}
 
 	var localAddr net.IP
+	var hasV6 bool
 	addrs, err := ifs[0].Addrs()
 	for _, addr := range addrs {
 		if strings.HasPrefix(addr.Network(), "ip") {
@@ -25,6 +26,15 @@ func TestRoute(t *testing.T) {
 			break
 		}
 	}
+	for _, addr := range addrs {
+		if strings.HasPrefix(addr.Network(), "ip") {
+			_, ipn, _ := net.ParseCIDR(addr.String())
+			if ipn.IP.To4() == nil {
+				hasV6 = true
+				break
+			}
+		}
+	}
 
 	_, gw, src, err := r.Route(localAddr)
 	if err != nil {
@@ -44,6 +54,9 @@ func TestRoute(t *testing.T) {
 	}
 
 	// Route to v4 and v6 should differ.
+	if !hasV6 {
+		return
+	}
 	_, v6gw, _, err := r.Route(net.ParseIP("2607:f8b0:400a:809::200e")) // at one point google.
 	if err != nil {
 		t.Fatal(err)