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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 TestClientConfigFromReaderAttempts(t *testing.T) {
testCases := []struct {
data string
expected int
}{
{data: "options attempts:0", expected: 1},
{data: "options attempts:1", expected: 1},
{data: "options attempts:15", expected: 15},
{data: "options attempts:16", expected: 16},
{data: "options attempts:-1", expected: 1},
{data: "options attempt:", expected: 2},
}
for _, test := range testCases {
test := test
t.Run(strings.Replace(test.data, ":", " ", -1), func(t *testing.T) {
t.Parallel()
cc, err := ClientConfigFromReader(strings.NewReader(test.data))
if err != nil {
t.Errorf("error parsing resolv.conf: %v", err)
}
if cc.Attempts != test.expected {
t.Errorf("A attempts not properly parsed: (Expected: %d / Was: %d)", test.expected, cc.Attempts)
}
})
}
}
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])
}
}