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Source file src/net/dnsconfig_unix_test.go

Documentation: net

     1  // Copyright 2013 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  // +build darwin dragonfly freebsd linux netbsd openbsd solaris
     6  
     7  package net
     8  
     9  import (
    10  	"errors"
    11  	"os"
    12  	"reflect"
    13  	"strings"
    14  	"testing"
    15  	"time"
    16  )
    17  
    18  var dnsReadConfigTests = []struct {
    19  	name string
    20  	want *dnsConfig
    21  }{
    22  	{
    23  		name: "testdata/resolv.conf",
    24  		want: &dnsConfig{
    25  			servers:    []string{"8.8.8.8:53", "[2001:4860:4860::8888]:53", "[fe80::1%lo0]:53"},
    26  			search:     []string{"localdomain."},
    27  			ndots:      5,
    28  			timeout:    10 * time.Second,
    29  			attempts:   3,
    30  			rotate:     true,
    31  			unknownOpt: true, // the "options attempts 3" line
    32  		},
    33  	},
    34  	{
    35  		name: "testdata/domain-resolv.conf",
    36  		want: &dnsConfig{
    37  			servers:  []string{"8.8.8.8:53"},
    38  			search:   []string{"localdomain."},
    39  			ndots:    1,
    40  			timeout:  5 * time.Second,
    41  			attempts: 2,
    42  		},
    43  	},
    44  	{
    45  		name: "testdata/search-resolv.conf",
    46  		want: &dnsConfig{
    47  			servers:  []string{"8.8.8.8:53"},
    48  			search:   []string{"test.", "invalid."},
    49  			ndots:    1,
    50  			timeout:  5 * time.Second,
    51  			attempts: 2,
    52  		},
    53  	},
    54  	{
    55  		name: "testdata/empty-resolv.conf",
    56  		want: &dnsConfig{
    57  			servers:  defaultNS,
    58  			ndots:    1,
    59  			timeout:  5 * time.Second,
    60  			attempts: 2,
    61  			search:   []string{"domain.local."},
    62  		},
    63  	},
    64  	{
    65  		name: "testdata/invalid-ndots-resolv.conf",
    66  		want: &dnsConfig{
    67  			servers:  defaultNS,
    68  			ndots:    0,
    69  			timeout:  5 * time.Second,
    70  			attempts: 2,
    71  			search:   []string{"domain.local."},
    72  		},
    73  	},
    74  	{
    75  		name: "testdata/large-ndots-resolv.conf",
    76  		want: &dnsConfig{
    77  			servers:  defaultNS,
    78  			ndots:    15,
    79  			timeout:  5 * time.Second,
    80  			attempts: 2,
    81  			search:   []string{"domain.local."},
    82  		},
    83  	},
    84  	{
    85  		name: "testdata/negative-ndots-resolv.conf",
    86  		want: &dnsConfig{
    87  			servers:  defaultNS,
    88  			ndots:    0,
    89  			timeout:  5 * time.Second,
    90  			attempts: 2,
    91  			search:   []string{"domain.local."},
    92  		},
    93  	},
    94  	{
    95  		name: "testdata/openbsd-resolv.conf",
    96  		want: &dnsConfig{
    97  			ndots:    1,
    98  			timeout:  5 * time.Second,
    99  			attempts: 2,
   100  			lookup:   []string{"file", "bind"},
   101  			servers:  []string{"169.254.169.254:53", "10.240.0.1:53"},
   102  			search:   []string{"c.symbolic-datum-552.internal."},
   103  		},
   104  	},
   105  }
   106  
   107  func TestDNSReadConfig(t *testing.T) {
   108  	origGetHostname := getHostname
   109  	defer func() { getHostname = origGetHostname }()
   110  	getHostname = func() (string, error) { return "host.domain.local", nil }
   111  
   112  	for _, tt := range dnsReadConfigTests {
   113  		conf := dnsReadConfig(tt.name)
   114  		if conf.err != nil {
   115  			t.Fatal(conf.err)
   116  		}
   117  		conf.mtime = time.Time{}
   118  		if !reflect.DeepEqual(conf, tt.want) {
   119  			t.Errorf("%s:\ngot: %+v\nwant: %+v", tt.name, conf, tt.want)
   120  		}
   121  	}
   122  }
   123  
   124  func TestDNSReadMissingFile(t *testing.T) {
   125  	origGetHostname := getHostname
   126  	defer func() { getHostname = origGetHostname }()
   127  	getHostname = func() (string, error) { return "host.domain.local", nil }
   128  
   129  	conf := dnsReadConfig("a-nonexistent-file")
   130  	if !os.IsNotExist(conf.err) {
   131  		t.Errorf("missing resolv.conf:\ngot: %v\nwant: %v", conf.err, os.ErrNotExist)
   132  	}
   133  	conf.err = nil
   134  	want := &dnsConfig{
   135  		servers:  defaultNS,
   136  		ndots:    1,
   137  		timeout:  5 * time.Second,
   138  		attempts: 2,
   139  		search:   []string{"domain.local."},
   140  	}
   141  	if !reflect.DeepEqual(conf, want) {
   142  		t.Errorf("missing resolv.conf:\ngot: %+v\nwant: %+v", conf, want)
   143  	}
   144  }
   145  
   146  var dnsDefaultSearchTests = []struct {
   147  	name string
   148  	err  error
   149  	want []string
   150  }{
   151  	{
   152  		name: "host.long.domain.local",
   153  		want: []string{"long.domain.local."},
   154  	},
   155  	{
   156  		name: "host.local",
   157  		want: []string{"local."},
   158  	},
   159  	{
   160  		name: "host",
   161  		want: nil,
   162  	},
   163  	{
   164  		name: "host.domain.local",
   165  		err:  errors.New("errored"),
   166  		want: nil,
   167  	},
   168  	{
   169  		// ensures we don't return []string{""}
   170  		// which causes duplicate lookups
   171  		name: "foo.",
   172  		want: nil,
   173  	},
   174  }
   175  
   176  func TestDNSDefaultSearch(t *testing.T) {
   177  	origGetHostname := getHostname
   178  	defer func() { getHostname = origGetHostname }()
   179  
   180  	for _, tt := range dnsDefaultSearchTests {
   181  		getHostname = func() (string, error) { return tt.name, tt.err }
   182  		got := dnsDefaultSearch()
   183  		if !reflect.DeepEqual(got, tt.want) {
   184  			t.Errorf("dnsDefaultSearch with hostname %q and error %+v = %q, wanted %q", tt.name, tt.err, got, tt.want)
   185  		}
   186  	}
   187  }
   188  
   189  func TestDNSNameLength(t *testing.T) {
   190  	origGetHostname := getHostname
   191  	defer func() { getHostname = origGetHostname }()
   192  	getHostname = func() (string, error) { return "host.domain.local", nil }
   193  
   194  	var char63 = ""
   195  	for i := 0; i < 63; i++ {
   196  		char63 += "a"
   197  	}
   198  	longDomain := strings.Repeat(char63+".", 5) + "example"
   199  
   200  	for _, tt := range dnsReadConfigTests {
   201  		conf := dnsReadConfig(tt.name)
   202  		if conf.err != nil {
   203  			t.Fatal(conf.err)
   204  		}
   205  
   206  		var shortestSuffix int
   207  		for _, suffix := range tt.want.search {
   208  			if shortestSuffix == 0 || len(suffix) < shortestSuffix {
   209  				shortestSuffix = len(suffix)
   210  			}
   211  		}
   212  
   213  		// Test a name that will be maximally long when prefixing the shortest
   214  		// suffix (accounting for the intervening dot).
   215  		longName := longDomain[len(longDomain)-254+1+shortestSuffix:]
   216  		if longName[0] == '.' || longName[1] == '.' {
   217  			longName = "aa." + longName[3:]
   218  		}
   219  		for _, fqdn := range conf.nameList(longName) {
   220  			if len(fqdn) > 254 {
   221  				t.Errorf("got %d; want less than or equal to 254", len(fqdn))
   222  			}
   223  		}
   224  
   225  		// Now test a name that's too long for suffixing.
   226  		unsuffixable := "a." + longName[1:]
   227  		unsuffixableResults := conf.nameList(unsuffixable)
   228  		if len(unsuffixableResults) != 1 {
   229  			t.Errorf("suffixed names %v; want []", unsuffixableResults[1:])
   230  		}
   231  
   232  		// Now test a name that's too long for DNS.
   233  		tooLong := "a." + longDomain
   234  		tooLongResults := conf.nameList(tooLong)
   235  		if tooLongResults != nil {
   236  			t.Errorf("suffixed names %v; want nil", tooLongResults)
   237  		}
   238  	}
   239  }
   240  

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