mirror of
https://github.com/netbirdio/netbird.git
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17b1099032
* Fix using wrong array index in log to avoid potential panic * Increase gRPC connection timeout and add the timeout resolv.conf option This makes sure the dns client is able to failover to a second configured nameserver, if present. That is the case then when using the dns `file` manager and a resolv.conf file generated for netbird. * On file backup restore, remove the first NS if it's the netbird NS * Bump dns mangager discovery message from debug to info to ease debugging
305 lines
8.3 KiB
Go
305 lines
8.3 KiB
Go
//go:build !android
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package dns
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import (
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"os"
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"path/filepath"
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"testing"
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"github.com/stretchr/testify/assert"
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)
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func Test_parseResolvConf(t *testing.T) {
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testCases := []struct {
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input string
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expectedSearch []string
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expectedNS []string
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expectedOther []string
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}{
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{
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input: `domain example.org
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search example.org
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nameserver 192.168.0.1
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`,
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expectedSearch: []string{"example.org"},
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expectedNS: []string{"192.168.0.1"},
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expectedOther: []string{},
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},
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{
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input: `# This is /run/systemd/resolve/resolv.conf managed by man:systemd-resolved(8).
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# Do not edit.
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#
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# This file might be symlinked as /etc/resolv.conf. If you're looking at
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# /etc/resolv.conf and seeing this text, you have followed the symlink.
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#
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# This is a dynamic resolv.conf file for connecting local clients directly to
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# all known uplink DNS servers. This file lists all configured search domains.
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#
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# Third party programs should typically not access this file directly, but only
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# through the symlink at /etc/resolv.conf. To manage man:resolv.conf(5) in a
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# different way, replace this symlink by a static file or a different symlink.
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#
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# See man:systemd-resolved.service(8) for details about the supported modes of
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# operation for /etc/resolv.conf.
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nameserver 192.168.2.1
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nameserver 100.81.99.197
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search netbird.cloud
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`,
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expectedSearch: []string{"netbird.cloud"},
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expectedNS: []string{"192.168.2.1", "100.81.99.197"},
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expectedOther: []string{},
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},
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{
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input: `# This is /run/systemd/resolve/resolv.conf managed by man:systemd-resolved(8).
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# Do not edit.
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#
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# This file might be symlinked as /etc/resolv.conf. If you're looking at
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# /etc/resolv.conf and seeing this text, you have followed the symlink.
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#
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# This is a dynamic resolv.conf file for connecting local clients directly to
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# all known uplink DNS servers. This file lists all configured search domains.
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#
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# Third party programs should typically not access this file directly, but only
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# through the symlink at /etc/resolv.conf. To manage man:resolv.conf(5) in a
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# different way, replace this symlink by a static file or a different symlink.
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#
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# See man:systemd-resolved.service(8) for details about the supported modes of
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# operation for /etc/resolv.conf.
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nameserver 192.168.2.1
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nameserver 100.81.99.197
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search netbird.cloud
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options debug
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`,
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expectedSearch: []string{"netbird.cloud"},
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expectedNS: []string{"192.168.2.1", "100.81.99.197"},
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expectedOther: []string{"options debug"},
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},
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}
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for _, testCase := range testCases {
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testCase := testCase
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t.Run("test", func(t *testing.T) {
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t.Parallel()
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tmpResolvConf := filepath.Join(t.TempDir(), "resolv.conf")
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err := os.WriteFile(tmpResolvConf, []byte(testCase.input), 0644)
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if err != nil {
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t.Fatal(err)
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}
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cfg, err := parseResolvConfFile(tmpResolvConf)
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if err != nil {
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t.Fatal(err)
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}
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ok := compareLists(cfg.searchDomains, testCase.expectedSearch)
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if !ok {
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t.Errorf("invalid parse result for search domains, expected: %v, got: %v", testCase.expectedSearch, cfg.searchDomains)
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}
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ok = compareLists(cfg.nameServers, testCase.expectedNS)
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if !ok {
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t.Errorf("invalid parse result for ns domains, expected: %v, got: %v", testCase.expectedNS, cfg.nameServers)
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}
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ok = compareLists(cfg.others, testCase.expectedOther)
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if !ok {
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t.Errorf("invalid parse result for others, expected: %v, got: %v", testCase.expectedOther, cfg.others)
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}
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})
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}
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}
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func compareLists(search []string, search2 []string) bool {
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if len(search) != len(search2) {
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return false
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}
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for i, v := range search {
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if v != search2[i] {
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return false
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}
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}
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return true
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}
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func Test_emptyFile(t *testing.T) {
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cfg, err := parseResolvConfFile("/tmp/nothing")
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if err == nil {
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t.Errorf("expected error, got nil")
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}
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if len(cfg.others) != 0 || len(cfg.searchDomains) != 0 || len(cfg.nameServers) != 0 {
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t.Errorf("expected empty config, got %v", cfg)
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}
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}
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func Test_symlink(t *testing.T) {
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input := `# This is /run/systemd/resolve/resolv.conf managed by man:systemd-resolved(8).
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# Do not edit.
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#
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# This file might be symlinked as /etc/resolv.conf. If you're looking at
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# /etc/resolv.conf and seeing this text, you have followed the symlink.
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#
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# This is a dynamic resolv.conf file for connecting local clients directly to
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# all known uplink DNS servers. This file lists all configured search domains.
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#
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# Third party programs should typically not access this file directly, but only
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# through the symlink at /etc/resolv.conf. To manage man:resolv.conf(5) in a
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# different way, replace this symlink by a static file or a different symlink.
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#
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# See man:systemd-resolved.service(8) for details about the supported modes of
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# operation for /etc/resolv.conf.
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nameserver 192.168.0.1
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`
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tmpResolvConf := filepath.Join(t.TempDir(), "resolv.conf")
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err := os.WriteFile(tmpResolvConf, []byte(input), 0644)
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if err != nil {
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t.Fatal(err)
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}
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tmpLink := filepath.Join(t.TempDir(), "symlink")
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err = os.Symlink(tmpResolvConf, tmpLink)
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if err != nil {
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t.Fatal(err)
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}
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cfg, err := parseResolvConfFile(tmpLink)
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if err != nil {
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t.Fatal(err)
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}
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if len(cfg.nameServers) != 1 {
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t.Errorf("unexpected resolv.conf content: %v", cfg)
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}
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}
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func TestPrepareOptionsWithTimeout(t *testing.T) {
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tests := []struct {
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name string
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others []string
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timeout int
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attempts int
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expected []string
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}{
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{
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name: "Append new options with timeout and attempts",
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others: []string{"some config"},
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timeout: 2,
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attempts: 2,
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expected: []string{"some config", "options timeout:2 attempts:2"},
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},
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{
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name: "Modify existing options to exclude rotate and include timeout and attempts",
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others: []string{"some config", "options rotate someother"},
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timeout: 3,
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attempts: 2,
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expected: []string{"some config", "options attempts:2 timeout:3 someother"},
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},
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{
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name: "Existing options with timeout and attempts are updated",
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others: []string{"some config", "options timeout:4 attempts:3"},
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timeout: 5,
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attempts: 4,
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expected: []string{"some config", "options timeout:5 attempts:4"},
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},
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{
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name: "Modify existing options, add missing attempts before timeout",
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others: []string{"some config", "options timeout:4"},
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timeout: 4,
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attempts: 3,
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expected: []string{"some config", "options attempts:3 timeout:4"},
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},
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}
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for _, tc := range tests {
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t.Run(tc.name, func(t *testing.T) {
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result := prepareOptionsWithTimeout(tc.others, tc.timeout, tc.attempts)
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assert.Equal(t, tc.expected, result)
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})
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}
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}
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func TestRemoveFirstNbNameserver(t *testing.T) {
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testCases := []struct {
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name string
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content string
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ipToRemove string
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expected string
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}{
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{
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name: "Unrelated nameservers with comments and options",
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content: `# This is a comment
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options rotate
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nameserver 1.1.1.1
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# Another comment
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nameserver 8.8.4.4
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search example.com`,
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ipToRemove: "9.9.9.9",
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expected: `# This is a comment
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options rotate
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nameserver 1.1.1.1
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# Another comment
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nameserver 8.8.4.4
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search example.com`,
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},
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{
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name: "First nameserver matches",
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content: `search example.com
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nameserver 9.9.9.9
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# oof, a comment
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nameserver 8.8.4.4
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options attempts:5`,
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ipToRemove: "9.9.9.9",
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expected: `search example.com
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# oof, a comment
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nameserver 8.8.4.4
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options attempts:5`,
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},
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{
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name: "Target IP not the first nameserver",
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// nolint:dupword
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content: `# Comment about the first nameserver
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nameserver 8.8.4.4
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# Comment before our target
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nameserver 9.9.9.9
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options timeout:2`,
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ipToRemove: "9.9.9.9",
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// nolint:dupword
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expected: `# Comment about the first nameserver
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nameserver 8.8.4.4
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# Comment before our target
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nameserver 9.9.9.9
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options timeout:2`,
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},
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{
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name: "Only nameserver matches",
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content: `options debug
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nameserver 9.9.9.9
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search localdomain`,
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ipToRemove: "9.9.9.9",
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expected: `options debug
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nameserver 9.9.9.9
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search localdomain`,
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},
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}
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for _, tc := range testCases {
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t.Run(tc.name, func(t *testing.T) {
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tempDir := t.TempDir()
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tempFile := filepath.Join(tempDir, "resolv.conf")
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err := os.WriteFile(tempFile, []byte(tc.content), 0644)
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assert.NoError(t, err)
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err = removeFirstNbNameserver(tempFile, tc.ipToRemove)
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assert.NoError(t, err)
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content, err := os.ReadFile(tempFile)
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assert.NoError(t, err)
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assert.Equal(t, tc.expected, string(content), "The resulting content should match the expected output.")
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})
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}
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}
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