// 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 net import ( "reflect" "strings" "testing" ) type staticHostEntry struct { in string out []string } var lookupStaticHostTests = []struct { name string ents []staticHostEntry }{ { "testdata/hosts", []staticHostEntry{ {"odin", []string{"127.0.0.2", "127.0.0.3", "::2"}}, {"thor", []string{"127.1.1.1"}}, {"ullr", []string{"127.1.1.2"}}, {"ullrhost", []string{"127.1.1.2"}}, {"localhost", []string{"fe80::1%lo0"}}, }, }, { "testdata/singleline-hosts", // see golang.org/issue/6646 []staticHostEntry{ {"odin", []string{"127.0.0.2"}}, }, }, { "testdata/ipv4-hosts", []staticHostEntry{ {"localhost", []string{"127.0.0.1", "127.0.0.2", "127.0.0.3"}}, {"localhost.localdomain", []string{"127.0.0.3"}}, }, }, { "testdata/ipv6-hosts", // see golang.org/issue/8996 []staticHostEntry{ {"localhost", []string{"::1", "fe80::1", "fe80::2%lo0", "fe80::3%lo0"}}, {"localhost.localdomain", []string{"fe80::3%lo0"}}, }, }, { "testdata/case-hosts", // see golang.org/issue/12806 []staticHostEntry{ {"PreserveMe", []string{"127.0.0.1", "::1"}}, {"PreserveMe.local", []string{"127.0.0.1", "::1"}}, }, }, } func TestLookupStaticHost(t *testing.T) { defer func(orig string) { testHookHostsPath = orig }(testHookHostsPath) for _, tt := range lookupStaticHostTests { testHookHostsPath = tt.name for _, ent := range tt.ents { testStaticHost(t, tt.name, ent) } } } func testStaticHost(t *testing.T, hostsPath string, ent staticHostEntry) { ins := []string{ent.in, absDomainName(ent.in), strings.ToLower(ent.in), strings.ToUpper(ent.in)} for _, in := range ins { addrs := lookupStaticHost(in) if !reflect.DeepEqual(addrs, ent.out) { t.Errorf("%s, lookupStaticHost(%s) = %v; want %v", hostsPath, in, addrs, ent.out) } } } var lookupStaticAddrTests = []struct { name string ents []staticHostEntry }{ { "testdata/hosts", []staticHostEntry{ {"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%lo0", []string{"localhost"}}, }, }, { "testdata/singleline-hosts", // see golang.org/issue/6646 []staticHostEntry{ {"127.0.0.2", []string{"odin"}}, }, }, { "testdata/ipv4-hosts", []staticHostEntry{ {"127.0.0.1", []string{"localhost"}}, {"127.0.0.2", []string{"localhost"}}, {"127.0.0.3", []string{"localhost", "localhost.localdomain"}}, }, }, { "testdata/ipv6-hosts", // see golang.org/issue/8996 []staticHostEntry{ {"::1", []string{"localhost"}}, {"fe80::1", []string{"localhost"}}, {"fe80::2%lo0", []string{"localhost"}}, {"fe80::3%lo0", []string{"localhost", "localhost.localdomain"}}, }, }, { "testdata/case-hosts", // see golang.org/issue/12806 []staticHostEntry{ {"127.0.0.1", []string{"PreserveMe", "PreserveMe.local"}}, {"::1", []string{"PreserveMe", "PreserveMe.local"}}, }, }, } func TestLookupStaticAddr(t *testing.T) { defer func(orig string) { testHookHostsPath = orig }(testHookHostsPath) for _, tt := range lookupStaticAddrTests { testHookHostsPath = tt.name for _, ent := range tt.ents { testStaticAddr(t, tt.name, ent) } } } func testStaticAddr(t *testing.T, hostsPath string, ent staticHostEntry) { hosts := 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", hostsPath, ent.in, hosts, ent.out) } } func TestHostCacheModification(t *testing.T) { // Ensure that programs can't modify the internals of the host cache. // See https://golang.org/issues/14212. defer func(orig string) { testHookHostsPath = orig }(testHookHostsPath) testHookHostsPath = "testdata/ipv4-hosts" ent := staticHostEntry{"localhost", []string{"127.0.0.1", "127.0.0.2", "127.0.0.3"}} testStaticHost(t, testHookHostsPath, ent) // Modify the addresses return by lookupStaticHost. addrs := lookupStaticHost(ent.in) for i := range addrs { addrs[i] += "junk" } testStaticHost(t, testHookHostsPath, ent) testHookHostsPath = "testdata/ipv6-hosts" ent = staticHostEntry{"::1", []string{"localhost"}} testStaticAddr(t, testHookHostsPath, ent) // Modify the hosts return by lookupStaticAddr. hosts := lookupStaticAddr(ent.in) for i := range hosts { hosts[i] += "junk" } testStaticAddr(t, testHookHostsPath, ent) }