net: add network interface identification API
This CL introduces new API into package net to identify the network
interface. A functionality of new API is very similar to RFC3493 -
"Interface Identification".
R=r, gri, bradfitz, robert.hencke, fullung, rsc
CC=golang-dev
https://golang.org/cl/4437087
diff --git a/src/pkg/net/interface_test.go b/src/pkg/net/interface_test.go
new file mode 100644
index 0000000..9384346
--- /dev/null
+++ b/src/pkg/net/interface_test.go
@@ -0,0 +1,90 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package net
+
+import (
+ "bytes"
+ "testing"
+)
+
+func sameInterface(i, j *Interface) bool {
+ if i == nil || j == nil {
+ return false
+ }
+ if i.Index == j.Index && i.Name == j.Name && bytes.Equal(i.HardwareAddr, j.HardwareAddr) {
+ return true
+ }
+ return false
+}
+
+func interfaceFlagsString(ifi *Interface) string {
+ fs := "<"
+ if ifi.IsUp() {
+ fs += "UP,"
+ }
+ if ifi.CanBroadcast() {
+ fs += "BROADCAST,"
+ }
+ if ifi.IsLoopback() {
+ fs += "LOOPBACK,"
+ }
+ if ifi.IsPointToPoint() {
+ fs += "POINTOPOINT,"
+ }
+ if ifi.CanMulticast() {
+ fs += "MULTICAST,"
+ }
+ if len(fs) > 1 {
+ fs = fs[:len(fs)-1]
+ }
+ fs += ">"
+ return fs
+}
+
+func TestInterfaces(t *testing.T) {
+ ift, err := Interfaces()
+ if err != nil {
+ t.Fatalf("Interfaces() failed: %v", err)
+ }
+ t.Logf("table: len/cap = %v/%v\n", len(ift), cap(ift))
+
+ for _, ifi := range ift {
+ ifxi, err := InterfaceByIndex(ifi.Index)
+ if err != nil {
+ t.Fatalf("InterfaceByIndex(%#q) failed: %v", ifi.Index, err)
+ }
+ if !sameInterface(ifxi, &ifi) {
+ t.Fatalf("InterfaceByIndex(%#q) = %v, want %v", ifi.Index, *ifxi, ifi)
+ }
+ ifxn, err := InterfaceByName(ifi.Name)
+ if err != nil {
+ t.Fatalf("InterfaceByName(%#q) failed: %v", ifi.Name, err)
+ }
+ if !sameInterface(ifxn, &ifi) {
+ t.Fatalf("InterfaceByName(%#q) = %v, want %v", ifi.Name, *ifxn, ifi)
+ }
+ ifat, err := ifi.Addrs()
+ if err != nil {
+ t.Fatalf("Interface.Addrs() failed: %v", err)
+ }
+ t.Logf("%s: flags %s, ifindex %v, mtu %v\n", ifi.Name, interfaceFlagsString(&ifi), ifi.Index, ifi.MTU)
+ for _, ifa := range ifat {
+ t.Logf("\tinterface address %s\n", ifa.String())
+ }
+ t.Logf("\thardware address %v", ifi.HardwareAddr.String())
+ }
+}
+
+func TestInterfaceAddrs(t *testing.T) {
+ ifat, err := InterfaceAddrs()
+ if err != nil {
+ t.Fatalf("InterfaceAddrs() failed: %v", err)
+ }
+ t.Logf("table: len/cap = %v/%v\n", len(ifat), cap(ifat))
+
+ for _, ifa := range ifat {
+ t.Logf("interface address %s\n", ifa.String())
+ }
+}
