Preview: interface_test.go
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/proc/thread-self/root/opt/golang/1.22.0/src/net/interface_test.go
// 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 (
"fmt"
"reflect"
"runtime"
"testing"
)
// loopbackInterface returns an available logical network interface
// for loopback tests. It returns nil if no suitable interface is
// found.
func loopbackInterface() *Interface {
ift, err := Interfaces()
if err != nil {
return nil
}
for _, ifi := range ift {
if ifi.Flags&FlagLoopback != 0 && ifi.Flags&FlagUp != 0 {
return &ifi
}
}
return nil
}
// ipv6LinkLocalUnicastAddr returns an IPv6 link-local unicast address
// on the given network interface for tests. It returns "" if no
// suitable address is found.
func ipv6LinkLocalUnicastAddr(ifi *Interface) string {
if ifi == nil {
return ""
}
ifat, err := ifi.Addrs()
if err != nil {
return ""
}
for _, ifa := range ifat {
if ifa, ok := ifa.(*IPNet); ok {
if ifa.IP.To4() == nil && ifa.IP.IsLinkLocalUnicast() {
return ifa.IP.String()
}
}
}
return ""
}
func TestInterfaces(t *testing.T) {
ift, err := Interfaces()
if err != nil {
t.Fatal(err)
}
for _, ifi := range ift {
ifxi, err := InterfaceByIndex(ifi.Index)
if err != nil {
t.Fatal(err)
}
switch runtime.GOOS {
case "solaris", "illumos":
if ifxi.Index != ifi.Index {
t.Errorf("got %v; want %v", ifxi, ifi)
}
default:
if !reflect.DeepEqual(ifxi, &ifi) {
t.Errorf("got %v; want %v", ifxi, ifi)
}
}
ifxn, err := InterfaceByName(ifi.Name)
if err != nil {
t.Fatal(err)
}
if !reflect.DeepEqual(ifxn, &ifi) {
t.Errorf("got %v; want %v", ifxn, ifi)
}
t.Logf("%s: flags=%v index=%d mtu=%d hwaddr=%v", ifi.Name, ifi.Flags, ifi.Index, ifi.MTU, ifi.HardwareAddr)
}
}
func TestInterfaceAddrs(t *testing.T) {
ift, err := Interfaces()
if err != nil {
t.Fatal(err)
}
ifStats := interfaceStats(ift)
ifat, err := InterfaceAddrs()
if err != nil {
t.Fatal(err)
}
uniStats, err := validateInterfaceUnicastAddrs(ifat)
if err != nil {
t.Fatal(err)
}
if err := checkUnicastStats(ifStats, uniStats); err != nil {
t.Fatal(err)
}
}
func TestInterfaceUnicastAddrs(t *testing.T) {
ift, err := Interfaces()
if err != nil {
t.Fatal(err)
}
ifStats := interfaceStats(ift)
if err != nil {
t.Fatal(err)
}
var uniStats routeStats
for _, ifi := range ift {
ifat, err := ifi.Addrs()
if err != nil {
t.Fatal(ifi, err)
}
stats, err := validateInterfaceUnicastAddrs(ifat)
if err != nil {
t.Fatal(ifi, err)
}
uniStats.ipv4 += stats.ipv4
uniStats.ipv6 += stats.ipv6
}
if err := checkUnicastStats(ifStats, &uniStats); err != nil {
t.Fatal(err)
}
}
func TestInterfaceMulticastAddrs(t *testing.T) {
ift, err := Interfaces()
if err != nil {
t.Fatal(err)
}
ifStats := interfaceStats(ift)
ifat, err := InterfaceAddrs()
if err != nil {
t.Fatal(err)
}
uniStats, err := validateInterfaceUnicastAddrs(ifat)
if err != nil {
t.Fatal(err)
}
var multiStats routeStats
for _, ifi := range ift {
ifmat, err := ifi.MulticastAddrs()
if err != nil {
t.Fatal(ifi, err)
}
stats, err := validateInterfaceMulticastAddrs(ifmat)
if err != nil {
t.Fatal(ifi, err)
}
multiStats.ipv4 += stats.ipv4
multiStats.ipv6 += stats.ipv6
}
if err := checkMulticastStats(ifStats, uniStats, &multiStats); err != nil {
t.Fatal(err)
}
}
type ifStats struct {
loop int // # of active loopback interfaces
other int // # of active other interfaces
}
func interfaceStats(ift []Interface) *ifStats {
var stats ifStats
for _, ifi := range ift {
if ifi.Flags&FlagUp != 0 {
if ifi.Flags&FlagLoopback != 0 {
stats.loop++
} else {
stats.other++
}
}
}
return &stats
}
type routeStats struct {
ipv4, ipv6 int // # of active connected unicast, anycast or multicast routes
}
func validateInterfaceUnicastAddrs(ifat []Addr) (*routeStats, error) {
// Note: BSD variants allow assigning any IPv4/IPv6 address
// prefix to IP interface. For example,
// - 0.0.0.0/0 through 255.255.255.255/32
// - ::/0 through ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff/128
// In other words, there is no tightly-coupled combination of
// interface address prefixes and connected routes.
stats := new(routeStats)
for _, ifa := range ifat {
switch ifa := ifa.(type) {
case *IPNet:
if ifa == nil || ifa.IP == nil || ifa.IP.IsMulticast() || ifa.Mask == nil {
return nil, fmt.Errorf("unexpected value: %#v", ifa)
}
if len(ifa.IP) != IPv6len {
return nil, fmt.Errorf("should be internal representation either IPv6 or IPv4-mapped IPv6 address: %#v", ifa)
}
prefixLen, maxPrefixLen := ifa.Mask.Size()
if ifa.IP.To4() != nil {
if 0 >= prefixLen || prefixLen > 8*IPv4len || maxPrefixLen != 8*IPv4len {
return nil, fmt.Errorf("unexpected prefix length: %d/%d for %#v", prefixLen, maxPrefixLen, ifa)
}
if ifa.IP.IsLoopback() && prefixLen < 8 { // see RFC 1122
return nil, fmt.Errorf("unexpected prefix length: %d/%d for %#v", prefixLen, maxPrefixLen, ifa)
}
stats.ipv4++
}
if ifa.IP.To16() != nil && ifa.IP.To4() == nil {
if 0 >= prefixLen || prefixLen > 8*IPv6len || maxPrefixLen != 8*IPv6len {
return nil, fmt.Errorf("unexpected prefix length: %d/%d for %#v", prefixLen, maxPrefixLen, ifa)
}
if ifa.IP.IsLoopback() && prefixLen != 8*IPv6len { // see RFC 4291
return nil, fmt.Errorf("unexpected prefix length: %d/%d for %#v", prefixLen, maxPrefixLen, ifa)
}
stats.ipv6++
}
case *IPAddr:
if ifa == nil || ifa.IP == nil || ifa.IP.IsMulticast() {
return nil, fmt.Errorf("unexpected value: %#v", ifa)
}
if len(ifa.IP) != IPv6len {
return nil, fmt.Errorf("should be internal representation either IPv6 or IPv4-mapped IPv6 address: %#v", ifa)
}
if ifa.IP.To4() != nil {
stats.ipv4++
}
if ifa.IP.To16() != nil && ifa.IP.To4() == nil {
stats.ipv6++
}
default:
return nil, fmt.Errorf("unexpected type: %T", ifa)
}
}
return stats, nil
}
func validateInterfaceMulticastAddrs(ifat []Addr) (*routeStats, error) {
stats := new(routeStats)
for _, ifa := range ifat {
switch ifa := ifa.(type) {
case *IPAddr:
if ifa == nil || ifa.IP == nil || ifa.IP.IsUnspecified() || !ifa.IP.IsMulticast() {
return nil, fmt.Errorf("unexpected value: %#v", ifa)
}
if len(ifa.IP) != IPv6len {
return nil, fmt.Errorf("should be internal representation either IPv6 or IPv4-mapped IPv6 address: %#v", ifa)
}
if ifa.IP.To4() != nil {
stats.ipv4++
}
if ifa.IP.To16() != nil && ifa.IP.To4() == nil {
stats.ipv6++
}
default:
return nil, fmt.Errorf("unexpected type: %T", ifa)
}
}
return stats, nil
}
func checkUnicastStats(ifStats *ifStats, uniStats *routeStats) error {
// Test the existence of connected unicast routes for IPv4.
if supportsIPv4() && ifStats.loop+ifStats.other > 0 && uniStats.ipv4 == 0 {
return fmt.Errorf("num IPv4 unicast routes = 0; want >0; summary: %+v, %+v", ifStats, uniStats)
}
// Test the existence of connected unicast routes for IPv6.
// We can assume the existence of ::1/128 when at least one
// loopback interface is installed.
if supportsIPv6() && ifStats.loop > 0 && uniStats.ipv6 == 0 {
return fmt.Errorf("num IPv6 unicast routes = 0; want >0; summary: %+v, %+v", ifStats, uniStats)
}
return nil
}
func checkMulticastStats(ifStats *ifStats, uniStats, multiStats *routeStats) error {
switch runtime.GOOS {
case "aix", "dragonfly", "netbsd", "openbsd", "plan9", "solaris", "illumos":
default:
// Test the existence of connected multicast route
// clones for IPv4. Unlike IPv6, IPv4 multicast
// capability is not a mandatory feature, and so IPv4
// multicast validation is ignored and we only check
// IPv6 below.
//
// Test the existence of connected multicast route
// clones for IPv6. Some platform never uses loopback
// interface as the nexthop for multicast routing.
// We can assume the existence of connected multicast
// route clones when at least two connected unicast
// routes, ::1/128 and other, are installed.
if supportsIPv6() && ifStats.loop > 0 && uniStats.ipv6 > 1 && multiStats.ipv6 == 0 {
return fmt.Errorf("num IPv6 multicast route clones = 0; want >0; summary: %+v, %+v, %+v", ifStats, uniStats, multiStats)
}
}
return nil
}
func BenchmarkInterfaces(b *testing.B) {
b.ReportAllocs()
testHookUninstaller.Do(uninstallTestHooks)
for i := 0; i < b.N; i++ {
if _, err := Interfaces(); err != nil {
b.Fatal(err)
}
}
}
func BenchmarkInterfaceByIndex(b *testing.B) {
b.ReportAllocs()
testHookUninstaller.Do(uninstallTestHooks)
ifi := loopbackInterface()
if ifi == nil {
b.Skip("loopback interface not found")
}
for i := 0; i < b.N; i++ {
if _, err := InterfaceByIndex(ifi.Index); err != nil {
b.Fatal(err)
}
}
}
func BenchmarkInterfaceByName(b *testing.B) {
b.ReportAllocs()
testHookUninstaller.Do(uninstallTestHooks)
ifi := loopbackInterface()
if ifi == nil {
b.Skip("loopback interface not found")
}
for i := 0; i < b.N; i++ {
if _, err := InterfaceByName(ifi.Name); err != nil {
b.Fatal(err)
}
}
}
func BenchmarkInterfaceAddrs(b *testing.B) {
b.ReportAllocs()
testHookUninstaller.Do(uninstallTestHooks)
for i := 0; i < b.N; i++ {
if _, err := InterfaceAddrs(); err != nil {
b.Fatal(err)
}
}
}
func BenchmarkInterfacesAndAddrs(b *testing.B) {
b.ReportAllocs()
testHookUninstaller.Do(uninstallTestHooks)
ifi := loopbackInterface()
if ifi == nil {
b.Skip("loopback interface not found")
}
for i := 0; i < b.N; i++ {
if _, err := ifi.Addrs(); err != nil {
b.Fatal(err)
}
}
}
func BenchmarkInterfacesAndMulticastAddrs(b *testing.B) {
b.ReportAllocs()
testHookUninstaller.Do(uninstallTestHooks)
ifi := loopbackInterface()
if ifi == nil {
b.Skip("loopback interface not found")
}
for i := 0; i < b.N; i++ {
if _, err := ifi.MulticastAddrs(); err != nil {
b.Fatal(err)
}
}
}
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