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// Copyright 2009 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 hosts
import (
"net"
"reflect"
"strings"
"testing"
"time"
)
func testHostsfile(file string) *Hostsfile {
h := &Hostsfile{expire: time.Now().Add(1 * time.Hour), Origins: []string{"."}}
h.Parse(strings.NewReader(file))
return h
}
type staticHostEntry struct {
in string
v4 []string
v6 []string
}
var (
hosts = `255.255.255.255 broadcasthost
127.0.0.2 odin
127.0.0.3 odin # inline comment
::2 odin
127.1.1.1 thor
# aliases
127.1.1.2 ullr ullrhost
fe80::1%lo0 localhost
# Bogus entries that must be ignored.
123.123.123 loki
321.321.321.321`
singlelinehosts = `127.0.0.2 odin`
ipv4hosts = `# See https://tools.ietf.org/html/rfc1123.
#
# The literal IPv4 address parser in the net package is a relaxed
# one. It may accept a literal IPv4 address in dotted-decimal notation
# with leading zeros such as "001.2.003.4".
# internet address and host name
127.0.0.1 localhost # inline comment separated by tab
127.000.000.002 localhost # inline comment separated by space
# internet address, host name and aliases
127.000.000.003 localhost localhost.localdomain`
ipv6hosts = `# See https://tools.ietf.org/html/rfc5952, https://tools.ietf.org/html/rfc4007.
# internet address and host name
::1 localhost # inline comment separated by tab
fe80:0000:0000:0000:0000:0000:0000:0001 localhost # inline comment separated by space
# internet address with zone identifier and host name
fe80:0000:0000:0000:0000:0000:0000:0002%lo0 localhost
# internet address, host name and aliases
fe80::3%lo0 localhost localhost.localdomain`
casehosts = `127.0.0.1 PreserveMe PreserveMe.local
::1 PreserveMe PreserveMe.local`
)
var lookupStaticHostTests = []struct {
file string
ents []staticHostEntry
}{
{
hosts,
[]staticHostEntry{
{"odin", []string{"127.0.0.2", "127.0.0.3"}, []string{"::2"}},
{"thor", []string{"127.1.1.1"}, []string{}},
{"ullr", []string{"127.1.1.2"}, []string{}},
{"ullrhost", []string{"127.1.1.2"}, []string{}},
{"localhost", []string{}, []string{"fe80::1"}},
},
},
{
singlelinehosts, // see golang.org/issue/6646
[]staticHostEntry{
{"odin", []string{"127.0.0.2"}, []string{}},
},
},
{
ipv4hosts,
[]staticHostEntry{
{"localhost", []string{"127.0.0.1", "127.0.0.2", "127.0.0.3"}, []string{}},
{"localhost.localdomain", []string{"127.0.0.3"}, []string{}},
},
},
{
ipv6hosts,
[]staticHostEntry{
{"localhost", []string{}, []string{"::1", "fe80::1", "fe80::2", "fe80::3"}},
{"localhost.localdomain", []string{}, []string{"fe80::3"}},
},
},
{
casehosts,
[]staticHostEntry{
{"PreserveMe", []string{"127.0.0.1"}, []string{"::1"}},
{"PreserveMe.local", []string{"127.0.0.1"}, []string{"::1"}},
},
},
}
func TestLookupStaticHost(t *testing.T) {
for _, tt := range lookupStaticHostTests {
h := testHostsfile(tt.file)
for _, ent := range tt.ents {
testStaticHost(t, ent, h)
}
}
}
func testStaticHost(t *testing.T, ent staticHostEntry, h *Hostsfile) {
ins := []string{ent.in, absDomainName(ent.in), strings.ToLower(ent.in), strings.ToUpper(ent.in)}
for k, in := range ins {
addrsV4 := h.LookupStaticHostV4(in)
if len(addrsV4) != len(ent.v4) {
t.Fatalf("%d, lookupStaticHostV4(%s) = %v; want %v", k, in, addrsV4, ent.v4)
}
for i, v4 := range addrsV4 {
if v4.String() != ent.v4[i] {
t.Fatalf("%d, lookupStaticHostV4(%s) = %v; want %v", k, in, addrsV4, ent.v4)
}
}
addrsV6 := h.LookupStaticHostV6(in)
if len(addrsV6) != len(ent.v6) {
t.Fatalf("%d, lookupStaticHostV6(%s) = %v; want %v", k, in, addrsV6, ent.v6)
}
for i, v6 := range addrsV6 {
if v6.String() != ent.v6[i] {
t.Fatalf("%d, lookupStaticHostV6(%s) = %v; want %v", k, in, addrsV6, ent.v6)
}
}
}
}
type staticIPEntry struct {
in string
out []string
}
var lookupStaticAddrTests = []struct {
file string
ents []staticIPEntry
}{
{
hosts,
[]staticIPEntry{
{"255.255.255.255", []string{"broadcasthost"}},
{"127.0.0.2", []string{"odin"}},
{"127.0.0.3", []string{"odin"}},
{"::2", []string{"odin"}},
{"127.1.1.1", []string{"thor"}},
{"127.1.1.2", []string{"ullr", "ullrhost"}},
{"fe80::1", []string{"localhost"}},
},
},
{
singlelinehosts, // see golang.org/issue/6646
[]staticIPEntry{
{"127.0.0.2", []string{"odin"}},
},
},
{
ipv4hosts, // see golang.org/issue/8996
[]staticIPEntry{
{"127.0.0.1", []string{"localhost"}},
{"127.0.0.2", []string{"localhost"}},
{"127.0.0.3", []string{"localhost", "localhost.localdomain"}},
},
},
{
ipv6hosts, // see golang.org/issue/8996
[]staticIPEntry{
{"::1", []string{"localhost"}},
{"fe80::1", []string{"localhost"}},
{"fe80::2", []string{"localhost"}},
{"fe80::3", []string{"localhost", "localhost.localdomain"}},
},
},
{
casehosts, // see golang.org/issue/12806
[]staticIPEntry{
{"127.0.0.1", []string{"PreserveMe", "PreserveMe.local"}},
{"::1", []string{"PreserveMe", "PreserveMe.local"}},
},
},
}
func TestLookupStaticAddr(t *testing.T) {
for _, tt := range lookupStaticAddrTests {
h := testHostsfile(tt.file)
for _, ent := range tt.ents {
testStaticAddr(t, ent, h)
}
}
}
func testStaticAddr(t *testing.T, ent staticIPEntry, h *Hostsfile) {
hosts := h.LookupStaticAddr(ent.in)
for i := range ent.out {
ent.out[i] = absDomainName(ent.out[i])
}
if !reflect.DeepEqual(hosts, ent.out) {
t.Errorf("%s, lookupStaticAddr(%s) = %v; want %v", h.path, ent.in, hosts, h)
}
}
func TestHostCacheModification(t *testing.T) {
// Ensure that programs can't modify the internals of the host cache.
// See https://github.com/golang/go/issues/14212.
h := testHostsfile(ipv4hosts)
ent := staticHostEntry{"localhost", []string{"127.0.0.1", "127.0.0.2", "127.0.0.3"}, []string{}}
testStaticHost(t, ent, h)
// Modify the addresses return by lookupStaticHost.
addrs := h.LookupStaticHostV6(ent.in)
for i := range addrs {
addrs[i] = net.IPv4zero
}
testStaticHost(t, ent, h)
h = testHostsfile(ipv6hosts)
entip := staticIPEntry{"::1", []string{"localhost"}}
testStaticAddr(t, entip, h)
// Modify the hosts return by lookupStaticAddr.
hosts := h.LookupStaticAddr(entip.in)
for i := range hosts {
hosts[i] += "junk"
}
testStaticAddr(t, entip, h)
}
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