623 lines
16 KiB
Go
623 lines
16 KiB
Go
package dnsforward
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import (
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"bytes"
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"encoding/json"
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"io"
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"net"
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"net/http"
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"net/http/httptest"
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"net/netip"
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"net/url"
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"os"
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"path/filepath"
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"strings"
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"testing"
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"testing/fstest"
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"time"
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"github.com/AdguardTeam/AdGuardHome/internal/aghhttp"
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"github.com/AdguardTeam/AdGuardHome/internal/aghnet"
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"github.com/AdguardTeam/AdGuardHome/internal/aghtest"
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"github.com/AdguardTeam/AdGuardHome/internal/filtering"
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"github.com/AdguardTeam/golibs/httphdr"
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"github.com/AdguardTeam/golibs/netutil"
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"github.com/AdguardTeam/golibs/testutil"
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"github.com/miekg/dns"
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"github.com/stretchr/testify/assert"
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"github.com/stretchr/testify/require"
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)
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// fakeSystemResolvers is a mock aghnet.SystemResolvers implementation for
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// tests.
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type fakeSystemResolvers struct {
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// SystemResolvers is embedded here simply to make *fakeSystemResolvers
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// an aghnet.SystemResolvers without actually implementing all methods.
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aghnet.SystemResolvers
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}
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// Get implements the aghnet.SystemResolvers interface for *fakeSystemResolvers.
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// It always returns nil.
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func (fsr *fakeSystemResolvers) Get() (rs []string) {
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return nil
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}
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func loadTestData(t *testing.T, casesFileName string, cases any) {
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t.Helper()
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var f *os.File
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f, err := os.Open(filepath.Join("testdata", casesFileName))
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require.NoError(t, err)
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testutil.CleanupAndRequireSuccess(t, f.Close)
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err = json.NewDecoder(f).Decode(cases)
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require.NoError(t, err)
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}
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const jsonExt = ".json"
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func TestDNSForwardHTTP_handleGetConfig(t *testing.T) {
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filterConf := &filtering.Config{
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SafeBrowsingEnabled: true,
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SafeBrowsingCacheSize: 1000,
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SafeSearchConf: filtering.SafeSearchConfig{Enabled: true},
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SafeSearchCacheSize: 1000,
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ParentalCacheSize: 1000,
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CacheTime: 30,
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}
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forwardConf := ServerConfig{
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UDPListenAddrs: []*net.UDPAddr{},
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TCPListenAddrs: []*net.TCPAddr{},
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FilteringConfig: FilteringConfig{
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ProtectionEnabled: true,
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BlockingMode: BlockingModeDefault,
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UpstreamDNS: []string{"8.8.8.8:53", "8.8.4.4:53"},
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EDNSClientSubnet: &EDNSClientSubnet{Enabled: false},
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},
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ConfigModified: func() {},
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}
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s := createTestServer(t, filterConf, forwardConf, nil)
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s.sysResolvers = &fakeSystemResolvers{}
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require.NoError(t, s.Start())
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testutil.CleanupAndRequireSuccess(t, s.Stop)
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defaultConf := s.conf
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w := httptest.NewRecorder()
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testCases := []struct {
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conf func() ServerConfig
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name string
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}{{
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conf: func() ServerConfig {
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return defaultConf
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},
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name: "all_right",
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}, {
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conf: func() ServerConfig {
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conf := defaultConf
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conf.FastestAddr = true
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return conf
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},
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name: "fastest_addr",
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}, {
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conf: func() ServerConfig {
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conf := defaultConf
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conf.AllServers = true
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return conf
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},
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name: "parallel",
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}}
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var data map[string]json.RawMessage
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loadTestData(t, t.Name()+jsonExt, &data)
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for _, tc := range testCases {
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caseWant, ok := data[tc.name]
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require.True(t, ok)
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t.Run(tc.name, func(t *testing.T) {
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t.Cleanup(w.Body.Reset)
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s.conf = tc.conf()
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s.handleGetConfig(w, nil)
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cType := w.Header().Get(httphdr.ContentType)
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assert.Equal(t, aghhttp.HdrValApplicationJSON, cType)
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assert.JSONEq(t, string(caseWant), w.Body.String())
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})
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}
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}
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func TestDNSForwardHTTP_handleSetConfig(t *testing.T) {
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filterConf := &filtering.Config{
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SafeBrowsingEnabled: true,
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SafeBrowsingCacheSize: 1000,
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SafeSearchConf: filtering.SafeSearchConfig{Enabled: true},
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SafeSearchCacheSize: 1000,
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ParentalCacheSize: 1000,
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CacheTime: 30,
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}
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forwardConf := ServerConfig{
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UDPListenAddrs: []*net.UDPAddr{},
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TCPListenAddrs: []*net.TCPAddr{},
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FilteringConfig: FilteringConfig{
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ProtectionEnabled: true,
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BlockingMode: BlockingModeDefault,
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UpstreamDNS: []string{"8.8.8.8:53", "8.8.4.4:53"},
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EDNSClientSubnet: &EDNSClientSubnet{Enabled: false},
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},
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ConfigModified: func() {},
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}
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s := createTestServer(t, filterConf, forwardConf, nil)
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s.sysResolvers = &fakeSystemResolvers{}
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defaultConf := s.conf
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err := s.Start()
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assert.NoError(t, err)
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testutil.CleanupAndRequireSuccess(t, s.Stop)
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w := httptest.NewRecorder()
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testCases := []struct {
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name string
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wantSet string
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}{{
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name: "upstream_dns",
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wantSet: "",
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}, {
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name: "bootstraps",
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wantSet: "",
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}, {
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name: "blocking_mode_good",
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wantSet: "",
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}, {
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name: "blocking_mode_bad",
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wantSet: "blocking_ipv4 must be set when blocking_mode is custom_ip",
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}, {
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name: "ratelimit",
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wantSet: "",
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}, {
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name: "edns_cs_enabled",
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wantSet: "",
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}, {
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name: "edns_cs_use_custom",
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wantSet: "",
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}, {
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name: "edns_cs_use_custom_bad_ip",
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wantSet: "decoding request: ParseAddr(\"bad.ip\"): unexpected character (at \"bad.ip\")",
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}, {
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name: "dnssec_enabled",
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wantSet: "",
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}, {
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name: "cache_size",
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wantSet: "",
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}, {
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name: "upstream_mode_parallel",
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wantSet: "",
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}, {
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name: "upstream_mode_fastest_addr",
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wantSet: "",
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}, {
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name: "upstream_dns_bad",
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wantSet: `validating upstream servers: validating upstream "!!!": not an ip:port`,
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}, {
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name: "bootstraps_bad",
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wantSet: `checking bootstrap a: invalid address: bootstrap a:53: ` +
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`ParseAddr("a"): unable to parse IP`,
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}, {
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name: "cache_bad_ttl",
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wantSet: `cache_ttl_min must be less or equal than cache_ttl_max`,
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}, {
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name: "upstream_mode_bad",
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wantSet: `upstream_mode: incorrect value`,
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}, {
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name: "local_ptr_upstreams_good",
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wantSet: "",
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}, {
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name: "local_ptr_upstreams_bad",
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wantSet: `validating private upstream servers: checking domain-specific upstreams: ` +
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`bad arpa domain name "non.arpa.": not a reversed ip network`,
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}, {
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name: "local_ptr_upstreams_null",
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wantSet: "",
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}}
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var data map[string]struct {
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Req json.RawMessage `json:"req"`
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Want json.RawMessage `json:"want"`
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}
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testData := t.Name() + jsonExt
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loadTestData(t, testData, &data)
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for _, tc := range testCases {
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// NOTE: Do not use require.Contains, because the size of the data
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// prevents it from printing a meaningful error message.
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caseData, ok := data[tc.name]
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require.Truef(t, ok, "%q does not contain test data for test case %s", testData, tc.name)
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t.Run(tc.name, func(t *testing.T) {
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t.Cleanup(func() {
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s.conf = defaultConf
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s.conf.FilteringConfig.EDNSClientSubnet = &EDNSClientSubnet{}
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})
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rBody := io.NopCloser(bytes.NewReader(caseData.Req))
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var r *http.Request
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r, err = http.NewRequest(http.MethodPost, "http://example.com", rBody)
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require.NoError(t, err)
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s.handleSetConfig(w, r)
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assert.Equal(t, tc.wantSet, strings.TrimSuffix(w.Body.String(), "\n"))
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w.Body.Reset()
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s.handleGetConfig(w, nil)
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assert.JSONEq(t, string(caseData.Want), w.Body.String())
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w.Body.Reset()
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})
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}
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}
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func TestIsCommentOrEmpty(t *testing.T) {
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for _, tc := range []struct {
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want assert.BoolAssertionFunc
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str string
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}{{
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want: assert.True,
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str: "",
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}, {
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want: assert.True,
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str: "# comment",
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}, {
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want: assert.False,
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str: "1.2.3.4",
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}} {
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tc.want(t, IsCommentOrEmpty(tc.str))
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}
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}
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func TestValidateUpstreams(t *testing.T) {
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const sdnsStamp = `sdns://AQMAAAAAAAAAFDE3Ni4xMDMuMTMwLjEzMDo1NDQzINErR_J` +
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`S3PLCu_iZEIbq95zkSV2LFsigxDIuUso_OQhzIjIuZG5zY3J5cHQuZGVmYXVsdC5uczE` +
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`uYWRndWFyZC5jb20`
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testCases := []struct {
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name string
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wantErr string
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set []string
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}{{
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name: "empty",
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wantErr: ``,
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set: nil,
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}, {
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name: "comment",
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wantErr: ``,
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set: []string{"# comment"},
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}, {
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name: "no_default",
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wantErr: `no default upstreams specified`,
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set: []string{
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"[/host.com/]1.1.1.1",
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"[//]tls://1.1.1.1",
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"[/www.host.com/]#",
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"[/host.com/google.com/]8.8.8.8",
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"[/host/]" + sdnsStamp,
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},
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}, {
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name: "with_default",
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wantErr: ``,
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set: []string{
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"[/host.com/]1.1.1.1",
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"[//]tls://1.1.1.1",
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"[/www.host.com/]#",
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"[/host.com/google.com/]8.8.8.8",
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"[/host/]" + sdnsStamp,
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"8.8.8.8",
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},
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}, {
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name: "invalid",
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wantErr: `validating upstream "dhcp://fake.dns": bad protocol "dhcp"`,
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set: []string{"dhcp://fake.dns"},
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}, {
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name: "invalid",
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wantErr: `validating upstream "1.2.3.4.5": not an ip:port`,
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set: []string{"1.2.3.4.5"},
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}, {
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name: "invalid",
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wantErr: `validating upstream "123.3.7m": not an ip:port`,
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set: []string{"123.3.7m"},
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}, {
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name: "invalid",
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wantErr: `bad upstream for domain "[/host.com]tls://dns.adguard.com": ` +
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`missing separator`,
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set: []string{"[/host.com]tls://dns.adguard.com"},
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}, {
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name: "invalid",
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wantErr: `validating upstream "[host.ru]#": not an ip:port`,
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set: []string{"[host.ru]#"},
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}, {
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name: "valid_default",
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wantErr: ``,
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set: []string{
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"1.1.1.1",
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"tls://1.1.1.1",
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"https://dns.adguard.com/dns-query",
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sdnsStamp,
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"udp://dns.google",
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"udp://8.8.8.8",
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"[/host.com/]1.1.1.1",
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"[//]tls://1.1.1.1",
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"[/www.host.com/]#",
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"[/host.com/google.com/]8.8.8.8",
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"[/host/]" + sdnsStamp,
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"[/пример.рф/]8.8.8.8",
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},
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}, {
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name: "bad_domain",
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wantErr: `bad upstream for domain "[/!/]8.8.8.8": domain at index 0: ` +
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`bad domain name "!": bad top-level domain name label "!": ` +
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`bad top-level domain name label rune '!'`,
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set: []string{"[/!/]8.8.8.8"},
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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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err := ValidateUpstreams(tc.set)
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testutil.AssertErrorMsg(t, tc.wantErr, err)
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})
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}
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}
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func TestValidateUpstreamsPrivate(t *testing.T) {
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ss := netutil.SubnetSetFunc(netutil.IsLocallyServed)
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testCases := []struct {
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name string
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wantErr string
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u string
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}{{
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name: "success_address",
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wantErr: ``,
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u: "[/1.0.0.127.in-addr.arpa/]#",
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}, {
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name: "success_subnet",
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wantErr: ``,
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u: "[/127.in-addr.arpa/]#",
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}, {
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name: "not_arpa_subnet",
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wantErr: `checking domain-specific upstreams: ` +
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`bad arpa domain name "hello.world.": not a reversed ip network`,
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u: "[/hello.world/]#",
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}, {
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name: "non-private_arpa_address",
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wantErr: `checking domain-specific upstreams: ` +
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`arpa domain "1.2.3.4.in-addr.arpa." should point to a locally-served network`,
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u: "[/1.2.3.4.in-addr.arpa/]#",
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}, {
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name: "non-private_arpa_subnet",
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wantErr: `checking domain-specific upstreams: ` +
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`arpa domain "128.in-addr.arpa." should point to a locally-served network`,
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u: "[/128.in-addr.arpa/]#",
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}, {
|
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name: "several_bad",
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wantErr: `checking domain-specific upstreams: 2 errors: ` +
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`"arpa domain \"1.2.3.4.in-addr.arpa.\" should point to a locally-served network", ` +
|
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`"bad arpa domain name \"non.arpa.\": not a reversed ip network"`,
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u: "[/non.arpa/1.2.3.4.in-addr.arpa/127.in-addr.arpa/]#",
|
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}, {
|
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name: "partial_good",
|
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wantErr: "",
|
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u: "[/a.1.2.3.10.in-addr.arpa/a.10.in-addr.arpa/]#",
|
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}}
|
|
|
|
for _, tc := range testCases {
|
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set := []string{"192.168.0.1", tc.u}
|
|
|
|
t.Run(tc.name, func(t *testing.T) {
|
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err := ValidateUpstreamsPrivate(set, ss)
|
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testutil.AssertErrorMsg(t, tc.wantErr, err)
|
|
})
|
|
}
|
|
}
|
|
|
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func newLocalUpstreamListener(t *testing.T, port uint16, handler dns.Handler) (real netip.AddrPort) {
|
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t.Helper()
|
|
|
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startCh := make(chan struct{})
|
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upsSrv := &dns.Server{
|
|
Addr: netip.AddrPortFrom(netutil.IPv4Localhost(), port).String(),
|
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Net: "tcp",
|
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Handler: handler,
|
|
NotifyStartedFunc: func() { close(startCh) },
|
|
}
|
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go func() {
|
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err := upsSrv.ListenAndServe()
|
|
require.NoError(testutil.PanicT{}, err)
|
|
}()
|
|
|
|
<-startCh
|
|
testutil.CleanupAndRequireSuccess(t, upsSrv.Shutdown)
|
|
|
|
return testutil.RequireTypeAssert[*net.TCPAddr](t, upsSrv.Listener.Addr()).AddrPort()
|
|
}
|
|
|
|
func TestServer_HandleTestUpstreamDNS(t *testing.T) {
|
|
goodHandler := dns.HandlerFunc(func(w dns.ResponseWriter, m *dns.Msg) {
|
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err := w.WriteMsg(new(dns.Msg).SetReply(m))
|
|
require.NoError(testutil.PanicT{}, err)
|
|
})
|
|
badHandler := dns.HandlerFunc(func(w dns.ResponseWriter, _ *dns.Msg) {
|
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err := w.WriteMsg(new(dns.Msg))
|
|
require.NoError(testutil.PanicT{}, err)
|
|
})
|
|
|
|
goodUps := (&url.URL{
|
|
Scheme: "tcp",
|
|
Host: newLocalUpstreamListener(t, 0, goodHandler).String(),
|
|
}).String()
|
|
badUps := (&url.URL{
|
|
Scheme: "tcp",
|
|
Host: newLocalUpstreamListener(t, 0, badHandler).String(),
|
|
}).String()
|
|
|
|
const (
|
|
upsTimeout = 100 * time.Millisecond
|
|
|
|
hostsFileName = "hosts"
|
|
upstreamHost = "custom.localhost"
|
|
)
|
|
|
|
hostsListener := newLocalUpstreamListener(t, 0, goodHandler)
|
|
hostsUps := (&url.URL{
|
|
Scheme: "tcp",
|
|
Host: netutil.JoinHostPort(upstreamHost, int(hostsListener.Port())),
|
|
}).String()
|
|
|
|
hc, err := aghnet.NewHostsContainer(
|
|
filtering.SysHostsListID,
|
|
fstest.MapFS{
|
|
hostsFileName: &fstest.MapFile{
|
|
Data: []byte(hostsListener.Addr().String() + " " + upstreamHost),
|
|
},
|
|
},
|
|
&aghtest.FSWatcher{
|
|
OnEvents: func() (e <-chan struct{}) { return nil },
|
|
OnAdd: func(_ string) (err error) { return nil },
|
|
OnClose: func() (err error) { return nil },
|
|
},
|
|
hostsFileName,
|
|
)
|
|
require.NoError(t, err)
|
|
|
|
srv := createTestServer(t, &filtering.Config{
|
|
EtcHosts: hc,
|
|
}, ServerConfig{
|
|
UDPListenAddrs: []*net.UDPAddr{{}},
|
|
TCPListenAddrs: []*net.TCPAddr{{}},
|
|
UpstreamTimeout: upsTimeout,
|
|
FilteringConfig: FilteringConfig{
|
|
EDNSClientSubnet: &EDNSClientSubnet{Enabled: false},
|
|
},
|
|
}, nil)
|
|
startDeferStop(t, srv)
|
|
|
|
testCases := []struct {
|
|
body map[string]any
|
|
wantResp map[string]any
|
|
name string
|
|
}{{
|
|
body: map[string]any{
|
|
"upstream_dns": []string{goodUps},
|
|
},
|
|
wantResp: map[string]any{
|
|
goodUps: "OK",
|
|
},
|
|
name: "success",
|
|
}, {
|
|
body: map[string]any{
|
|
"upstream_dns": []string{badUps},
|
|
},
|
|
wantResp: map[string]any{
|
|
badUps: `couldn't communicate with upstream: exchanging with ` +
|
|
badUps + ` over tcp: dns: id mismatch`,
|
|
},
|
|
name: "broken",
|
|
}, {
|
|
body: map[string]any{
|
|
"upstream_dns": []string{goodUps, badUps},
|
|
},
|
|
wantResp: map[string]any{
|
|
goodUps: "OK",
|
|
badUps: `couldn't communicate with upstream: exchanging with ` +
|
|
badUps + ` over tcp: dns: id mismatch`,
|
|
},
|
|
name: "both",
|
|
}, {
|
|
body: map[string]any{
|
|
"upstream_dns": []string{"[/domain.example/]" + badUps},
|
|
},
|
|
wantResp: map[string]any{
|
|
"[/domain.example/]" + badUps: `WARNING: couldn't communicate ` +
|
|
`with upstream: exchanging with ` + badUps + ` over tcp: ` +
|
|
`dns: id mismatch`,
|
|
},
|
|
name: "domain_specific_error",
|
|
}, {
|
|
body: map[string]any{
|
|
"upstream_dns": []string{hostsUps},
|
|
},
|
|
wantResp: map[string]any{
|
|
hostsUps: "OK",
|
|
},
|
|
name: "etc_hosts",
|
|
}}
|
|
|
|
for _, tc := range testCases {
|
|
t.Run(tc.name, func(t *testing.T) {
|
|
var reqBody []byte
|
|
reqBody, err = json.Marshal(tc.body)
|
|
require.NoError(t, err)
|
|
|
|
w := httptest.NewRecorder()
|
|
|
|
var r *http.Request
|
|
r, err = http.NewRequest(http.MethodPost, "", bytes.NewReader(reqBody))
|
|
require.NoError(t, err)
|
|
|
|
srv.handleTestUpstreamDNS(w, r)
|
|
require.Equal(t, http.StatusOK, w.Code)
|
|
|
|
resp := map[string]any{}
|
|
err = json.NewDecoder(w.Body).Decode(&resp)
|
|
require.NoError(t, err)
|
|
|
|
assert.Equal(t, tc.wantResp, resp)
|
|
})
|
|
}
|
|
|
|
t.Run("timeout", func(t *testing.T) {
|
|
slowHandler := dns.HandlerFunc(func(w dns.ResponseWriter, m *dns.Msg) {
|
|
time.Sleep(upsTimeout * 2)
|
|
writeErr := w.WriteMsg(new(dns.Msg).SetReply(m))
|
|
require.NoError(testutil.PanicT{}, writeErr)
|
|
})
|
|
sleepyUps := (&url.URL{
|
|
Scheme: "tcp",
|
|
Host: newLocalUpstreamListener(t, 0, slowHandler).String(),
|
|
}).String()
|
|
|
|
req := map[string]any{
|
|
"upstream_dns": []string{sleepyUps},
|
|
}
|
|
|
|
var reqBody []byte
|
|
reqBody, err = json.Marshal(req)
|
|
require.NoError(t, err)
|
|
|
|
w := httptest.NewRecorder()
|
|
|
|
var r *http.Request
|
|
r, err = http.NewRequest(http.MethodPost, "", bytes.NewReader(reqBody))
|
|
require.NoError(t, err)
|
|
|
|
srv.handleTestUpstreamDNS(w, r)
|
|
require.Equal(t, http.StatusOK, w.Code)
|
|
|
|
resp := map[string]any{}
|
|
err = json.NewDecoder(w.Body).Decode(&resp)
|
|
require.NoError(t, err)
|
|
|
|
require.Contains(t, resp, sleepyUps)
|
|
require.IsType(t, "", resp[sleepyUps])
|
|
sleepyRes, _ := resp[sleepyUps].(string)
|
|
|
|
// TODO(e.burkov): Improve the format of an error in dnsproxy.
|
|
assert.True(t, strings.HasSuffix(sleepyRes, "i/o timeout"))
|
|
})
|
|
}
|