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Code Editor : dnsconfig_unix_test.go
// Copyright 2013 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. // +build aix darwin dragonfly freebsd linux netbsd openbsd solaris package net import ( "errors" "os" "reflect" "strings" "testing" "time" ) var dnsReadConfigTests = []struct { name string want *dnsConfig }{ { name: "testdata/resolv.conf", want: &dnsConfig{ servers: []string{"8.8.8.8:53", "[2001:4860:4860::8888]:53", "[fe80::1%lo0]:53"}, search: []string{"localdomain."}, ndots: 5, timeout: 10 * time.Second, attempts: 3, rotate: true, unknownOpt: true, // the "options attempts 3" line }, }, { name: "testdata/domain-resolv.conf", want: &dnsConfig{ servers: []string{"8.8.8.8:53"}, search: []string{"localdomain."}, ndots: 1, timeout: 5 * time.Second, attempts: 2, }, }, { name: "testdata/search-resolv.conf", want: &dnsConfig{ servers: []string{"8.8.8.8:53"}, search: []string{"test.", "invalid."}, ndots: 1, timeout: 5 * time.Second, attempts: 2, }, }, { name: "testdata/empty-resolv.conf", want: &dnsConfig{ servers: defaultNS, ndots: 1, timeout: 5 * time.Second, attempts: 2, search: []string{"domain.local."}, }, }, { name: "testdata/invalid-ndots-resolv.conf", want: &dnsConfig{ servers: defaultNS, ndots: 0, timeout: 5 * time.Second, attempts: 2, search: []string{"domain.local."}, }, }, { name: "testdata/large-ndots-resolv.conf", want: &dnsConfig{ servers: defaultNS, ndots: 15, timeout: 5 * time.Second, attempts: 2, search: []string{"domain.local."}, }, }, { name: "testdata/negative-ndots-resolv.conf", want: &dnsConfig{ servers: defaultNS, ndots: 0, timeout: 5 * time.Second, attempts: 2, search: []string{"domain.local."}, }, }, { name: "testdata/openbsd-resolv.conf", want: &dnsConfig{ ndots: 1, timeout: 5 * time.Second, attempts: 2, lookup: []string{"file", "bind"}, servers: []string{"169.254.169.254:53", "10.240.0.1:53"}, search: []string{"c.symbolic-datum-552.internal."}, }, }, { name: "testdata/single-request-resolv.conf", want: &dnsConfig{ servers: defaultNS, ndots: 1, singleRequest: true, timeout: 5 * time.Second, attempts: 2, search: []string{"domain.local."}, }, }, { name: "testdata/single-request-reopen-resolv.conf", want: &dnsConfig{ servers: defaultNS, ndots: 1, singleRequest: true, timeout: 5 * time.Second, attempts: 2, search: []string{"domain.local."}, }, }, { name: "testdata/linux-use-vc-resolv.conf", want: &dnsConfig{ servers: defaultNS, ndots: 1, useTCP: true, timeout: 5 * time.Second, attempts: 2, search: []string{"domain.local."}, }, }, { name: "testdata/freebsd-usevc-resolv.conf", want: &dnsConfig{ servers: defaultNS, ndots: 1, useTCP: true, timeout: 5 * time.Second, attempts: 2, search: []string{"domain.local."}, }, }, { name: "testdata/openbsd-tcp-resolv.conf", want: &dnsConfig{ servers: defaultNS, ndots: 1, useTCP: true, timeout: 5 * time.Second, attempts: 2, search: []string{"domain.local."}, }, }, } func TestDNSReadConfig(t *testing.T) { origGetHostname := getHostname defer func() { getHostname = origGetHostname }() getHostname = func() (string, error) { return "host.domain.local", nil } for _, tt := range dnsReadConfigTests { conf := dnsReadConfig(tt.name) if conf.err != nil { t.Fatal(conf.err) } conf.mtime = time.Time{} if !reflect.DeepEqual(conf, tt.want) { t.Errorf("%s:\ngot: %+v\nwant: %+v", tt.name, conf, tt.want) } } } func TestDNSReadMissingFile(t *testing.T) { origGetHostname := getHostname defer func() { getHostname = origGetHostname }() getHostname = func() (string, error) { return "host.domain.local", nil } conf := dnsReadConfig("a-nonexistent-file") if !os.IsNotExist(conf.err) { t.Errorf("missing resolv.conf:\ngot: %v\nwant: %v", conf.err, os.ErrNotExist) } conf.err = nil want := &dnsConfig{ servers: defaultNS, ndots: 1, timeout: 5 * time.Second, attempts: 2, search: []string{"domain.local."}, } if !reflect.DeepEqual(conf, want) { t.Errorf("missing resolv.conf:\ngot: %+v\nwant: %+v", conf, want) } } var dnsDefaultSearchTests = []struct { name string err error want []string }{ { name: "host.long.domain.local", want: []string{"long.domain.local."}, }, { name: "host.local", want: []string{"local."}, }, { name: "host", want: nil, }, { name: "host.domain.local", err: errors.New("errored"), want: nil, }, { // ensures we don't return []string{""} // which causes duplicate lookups name: "foo.", want: nil, }, } func TestDNSDefaultSearch(t *testing.T) { origGetHostname := getHostname defer func() { getHostname = origGetHostname }() for _, tt := range dnsDefaultSearchTests { getHostname = func() (string, error) { return tt.name, tt.err } got := dnsDefaultSearch() if !reflect.DeepEqual(got, tt.want) { t.Errorf("dnsDefaultSearch with hostname %q and error %+v = %q, wanted %q", tt.name, tt.err, got, tt.want) } } } func TestDNSNameLength(t *testing.T) { origGetHostname := getHostname defer func() { getHostname = origGetHostname }() getHostname = func() (string, error) { return "host.domain.local", nil } var char63 = "" for i := 0; i < 63; i++ { char63 += "a" } longDomain := strings.Repeat(char63+".", 5) + "example" for _, tt := range dnsReadConfigTests { conf := dnsReadConfig(tt.name) if conf.err != nil { t.Fatal(conf.err) } var shortestSuffix int for _, suffix := range tt.want.search { if shortestSuffix == 0 || len(suffix) < shortestSuffix { shortestSuffix = len(suffix) } } // Test a name that will be maximally long when prefixing the shortest // suffix (accounting for the intervening dot). longName := longDomain[len(longDomain)-254+1+shortestSuffix:] if longName[0] == '.' || longName[1] == '.' { longName = "aa." + longName[3:] } for _, fqdn := range conf.nameList(longName) { if len(fqdn) > 254 { t.Errorf("got %d; want less than or equal to 254", len(fqdn)) } } // Now test a name that's too long for suffixing. unsuffixable := "a." + longName[1:] unsuffixableResults := conf.nameList(unsuffixable) if len(unsuffixableResults) != 1 { t.Errorf("suffixed names %v; want []", unsuffixableResults[1:]) } // Now test a name that's too long for DNS. tooLong := "a." + longDomain tooLongResults := conf.nameList(tooLong) if tooLongResults != nil { t.Errorf("suffixed names %v; want nil", tooLongResults) } } }
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