test nits

README.md

 Go Netroute
 ===
 
+[![Build Status](https://travis-ci.com/willscott/go-netroute.svg?branch=master)](https://travis-ci.com/willscott/go-netroute)
+
 A cross-platform implementation of the [`gopacket/routing.Router`](https://godoc.org/github.com/google/gopacket/routing#Router) interface.
 
 This library uses `gopacket` for linux, `x/net/route`

netroute_darwin.go

@@ -168,7 +168,7 @@ func toIPAddr(a route.Addr) (net.IP, error) {
 		copy(ip, t.IP[:])
 		return ip, nil
 	default:
-		return net.IP{}, fmt.Errorf("unknown family: %T", t)
+		return net.IP{}, fmt.Errorf("unknown family: %v", t)
 	}
 }
 

netroute_test.go

@@ -2,6 +2,7 @@ package netroute
 
 import (
 	"net"
+	"strings"
 	"testing"
 )
 
@@ -11,12 +12,25 @@ func TestRoute(t *testing.T) {
 		t.Fatal(err)
 	}
 
-	// Route to 127.0.0.1 shouldn't have a gateway
-	_, gw, _, err := r.Route(net.IPv4(127, 0, 0, 1))
+	ifs, err := net.Interfaces()
+	if err != nil || len(ifs) == 0 {
+		t.Skip("Can't test routing without access to system interfaces")
+	}
+
+	var localAddr net.IP
+	addrs, err := ifs[0].Addrs()
+	for _, addr := range addrs {
+		if strings.HasPrefix(addr.Network(), "ip") {
+			localAddr, _, _ = net.ParseCIDR(addr.String())
+			break
+		}
+	}
+
+	_, gw, src, err := r.Route(localAddr)
 	if err != nil {
 		t.Fatal(err)
 	}
-	if gw != nil {
+	if gw != nil || !src.Equal(localAddr) {
 		t.Fatalf("Did not expect gateway to localhost: %v", gw)
 	}
 

netroute_windows.go

@@ -174,7 +174,7 @@ func getIface(index uint32) *net.Interface {
 	ifRow.Index = index
 	err := windows.GetIfEntry(&ifRow)
 	if err != nil {
-		return il
+		return nil
 	}
 
 	ifaces, err := net.Interfaces()
@@ -182,7 +182,7 @@ func getIface(index uint32) *net.Interface {
 		return nil
 	}
 	for _, iface := range ifaces {
-		if bytes.Equal(iface.HardwareAddr, ifRow.PhysAddr) {
+		if bytes.Equal(iface.HardwareAddr, ifRow.PhysAddr[:]) {
 			return &iface
 		}
 	}
@@ -200,10 +200,10 @@ func (r *winRouter) RouteWithSrc(input net.HardwareAddr, src, dst net.IP) (iface
 	if err != nil {
 		return nil, nil, nil, err
 	}
-	iface := getIface(route.index)
+	iface = getIface(route.index)
 
 	if route.nextHop.Addr.Family == 0 /* AF_UNDEF */ {
-		return nil, nil, pref, nil
+		return iface, nil, pref, nil
 	}
 	addr, err := route.nextHop.Sockaddr()
 	if err != nil {
@@ -211,7 +211,7 @@ func (r *winRouter) RouteWithSrc(input net.HardwareAddr, src, dst net.IP) (iface
 	}
 	nextHop, _ := sockaddrnet.SockaddrToIPAndZone(addr)
 
-	return nil, nextHop, pref, nil
+	return iface, nextHop, pref, nil
 }
 
 func New() (routing.Router, error) {