package dns import ( "io/ioutil" "os" "path/filepath" "strings" "testing" ) const normal string = ` # Comment domain somedomain.com nameserver 10.28.10.2 nameserver 11.28.10.1 ` const missingNewline string = ` domain somedomain.com nameserver 10.28.10.2 nameserver 11.28.10.1` // <- NOTE: NO newline. func testConfig(t *testing.T, data string) { cc, err := ClientConfigFromReader(strings.NewReader(data)) if err != nil { t.Errorf("error parsing resolv.conf: %v", err) } if l := len(cc.Servers); l != 2 { t.Errorf("incorrect number of nameservers detected: %d", l) } if l := len(cc.Search); l != 1 { t.Errorf("domain directive not parsed correctly: %v", cc.Search) } else { if cc.Search[0] != "somedomain.com" { t.Errorf("domain is unexpected: %v", cc.Search[0]) } } } func TestNameserver(t *testing.T) { testConfig(t, normal) } func TestMissingFinalNewLine(t *testing.T) { testConfig(t, missingNewline) } func TestNdots(t *testing.T) { ndotsVariants := map[string]int{ "options ndots:0": 0, "options ndots:1": 1, "options ndots:15": 15, "options ndots:16": 15, "options ndots:-1": 0, "": 1, } for data := range ndotsVariants { cc, err := ClientConfigFromReader(strings.NewReader(data)) if err != nil { t.Errorf("error parsing resolv.conf: %v", err) } if cc.Ndots != ndotsVariants[data] { t.Errorf("Ndots not properly parsed: (Expected: %d / Was: %d)", ndotsVariants[data], cc.Ndots) } } } func TestReadFromFile(t *testing.T) { tempDir, err := ioutil.TempDir("", "") if err != nil { t.Fatalf("tempDir: %v", err) } defer os.RemoveAll(tempDir) path := filepath.Join(tempDir, "resolv.conf") if err := ioutil.WriteFile(path, []byte(normal), 0644); err != nil { t.Fatalf("writeFile: %v", err) } cc, err := ClientConfigFromFile(path) if err != nil { t.Errorf("error parsing resolv.conf: %v", err) } if l := len(cc.Servers); l != 2 { t.Errorf("incorrect number of nameservers detected: %d", l) } if l := len(cc.Search); l != 1 { t.Errorf("domain directive not parsed correctly: %v", cc.Search) } else { if cc.Search[0] != "somedomain.com" { t.Errorf("domain is unexpected: %v", cc.Search[0]) } } } func TestNameListNdots1(t *testing.T) { cfg := ClientConfig{ Ndots: 1, } // fqdn should be only result returned names := cfg.NameList("miek.nl.") if len(names) != 1 { t.Errorf("NameList returned != 1 names: %v", names) } else if names[0] != "miek.nl." { t.Errorf("NameList didn't return sent fqdn domain: %v", names[0]) } cfg.Search = []string{ "test", } // Sent domain has NDots and search names = cfg.NameList("miek.nl") if len(names) != 2 { t.Errorf("NameList returned != 2 names: %v", names) } else if names[0] != "miek.nl." { t.Errorf("NameList didn't return sent domain first: %v", names[0]) } else if names[1] != "miek.nl.test." { t.Errorf("NameList didn't return search last: %v", names[1]) } } func TestNameListNdots2(t *testing.T) { cfg := ClientConfig{ Ndots: 2, } // Sent domain has less than NDots and search cfg.Search = []string{ "test", } names := cfg.NameList("miek.nl") if len(names) != 2 { t.Errorf("NameList returned != 2 names: %v", names) } else if names[0] != "miek.nl.test." { t.Errorf("NameList didn't return search first: %v", names[0]) } else if names[1] != "miek.nl." { t.Errorf("NameList didn't return sent domain last: %v", names[1]) } } func TestNameListNdots0(t *testing.T) { cfg := ClientConfig{ Ndots: 0, } cfg.Search = []string{ "test", } // Sent domain has less than NDots and search names := cfg.NameList("miek") if len(names) != 2 { t.Errorf("NameList returned != 2 names: %v", names) } else if names[0] != "miek." { t.Errorf("NameList didn't return search first: %v", names[0]) } else if names[1] != "miek.test." { t.Errorf("NameList didn't return sent domain last: %v", names[1]) } }