AdGuardHome/internal/home/rdns_test.go

270 lines
6.3 KiB
Go

package home
import (
"bytes"
"encoding/binary"
"fmt"
"net"
"net/netip"
"sync"
"testing"
"time"
"github.com/AdguardTeam/AdGuardHome/internal/aghalg"
"github.com/AdguardTeam/AdGuardHome/internal/aghtest"
"github.com/AdguardTeam/dnsproxy/upstream"
"github.com/AdguardTeam/golibs/cache"
"github.com/AdguardTeam/golibs/log"
"github.com/AdguardTeam/golibs/netutil"
"github.com/AdguardTeam/golibs/stringutil"
"github.com/miekg/dns"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
)
func TestRDNS_Begin(t *testing.T) {
aghtest.ReplaceLogLevel(t, log.DEBUG)
w := &bytes.Buffer{}
aghtest.ReplaceLogWriter(t, w)
ip1234, ip1235 := netip.MustParseAddr("1.2.3.4"), netip.MustParseAddr("1.2.3.5")
testCases := []struct {
cliIDIndex map[string]*Client
customChan chan netip.Addr
name string
wantLog string
ip netip.Addr
wantCacheHit int
wantCacheMiss int
}{{
cliIDIndex: map[string]*Client{},
customChan: nil,
name: "cached",
wantLog: "",
ip: ip1234,
wantCacheHit: 1,
wantCacheMiss: 0,
}, {
cliIDIndex: map[string]*Client{},
customChan: nil,
name: "not_cached",
wantLog: "rdns: queue is full",
ip: ip1235,
wantCacheHit: 0,
wantCacheMiss: 1,
}, {
cliIDIndex: map[string]*Client{"1.2.3.5": {}},
customChan: nil,
name: "already_in_clients",
wantLog: "",
ip: ip1235,
wantCacheHit: 0,
wantCacheMiss: 1,
}, {
cliIDIndex: map[string]*Client{},
customChan: make(chan netip.Addr, 1),
name: "add_to_queue",
wantLog: `rdns: "1.2.3.5" added to queue`,
ip: ip1235,
wantCacheHit: 0,
wantCacheMiss: 1,
}}
for _, tc := range testCases {
w.Reset()
ipCache := cache.New(cache.Config{
EnableLRU: true,
MaxCount: revDNSCacheSize,
})
ttl := make([]byte, binary.Size(uint64(0)))
binary.BigEndian.PutUint64(ttl, uint64(time.Now().Add(100*time.Hour).Unix()))
rdns := &RDNS{
ipCache: ipCache,
exchanger: &rDNSExchanger{
ex: aghtest.NewErrorUpstream(),
},
clients: &clientsContainer{
list: map[string]*Client{},
idIndex: tc.cliIDIndex,
ipToRC: map[netip.Addr]*RuntimeClient{},
allTags: stringutil.NewSet(),
},
}
ipCache.Clear()
ipCache.Set(net.IP{1, 2, 3, 4}, ttl)
if tc.customChan != nil {
rdns.ipCh = tc.customChan
defer close(tc.customChan)
}
t.Run(tc.name, func(t *testing.T) {
rdns.Begin(tc.ip)
assert.Equal(t, tc.wantCacheHit, ipCache.Stats().Hit)
assert.Equal(t, tc.wantCacheMiss, ipCache.Stats().Miss)
assert.Contains(t, w.String(), tc.wantLog)
})
}
}
// rDNSExchanger is a mock dnsforward.RDNSExchanger implementation for tests.
type rDNSExchanger struct {
ex upstream.Upstream
usePrivate bool
}
// Exchange implements dnsforward.RDNSExchanger interface for *RDNSExchanger.
func (e *rDNSExchanger) Exchange(ip net.IP) (host string, err error) {
rev, err := netutil.IPToReversedAddr(ip)
if err != nil {
return "", fmt.Errorf("reversing ip: %w", err)
}
req := &dns.Msg{
Question: []dns.Question{{
Name: dns.Fqdn(rev),
Qclass: dns.ClassINET,
Qtype: dns.TypePTR,
}},
}
resp, err := e.ex.Exchange(req)
if err != nil {
return "", err
}
if len(resp.Answer) == 0 {
return "", nil
}
return resp.Answer[0].Header().Name, nil
}
// Exchange implements dnsforward.RDNSExchanger interface for *RDNSExchanger.
func (e *rDNSExchanger) ResolvesPrivatePTR() (ok bool) {
return e.usePrivate
}
func TestRDNS_ensurePrivateCache(t *testing.T) {
data := []byte{1, 2, 3, 4}
ipCache := cache.New(cache.Config{
EnableLRU: true,
MaxCount: revDNSCacheSize,
})
ex := &rDNSExchanger{
ex: aghtest.NewErrorUpstream(),
}
rdns := &RDNS{
ipCache: ipCache,
exchanger: ex,
}
rdns.ipCache.Set(data, data)
require.NotZero(t, rdns.ipCache.Stats().Count)
ex.usePrivate = !ex.usePrivate
rdns.ensurePrivateCache()
require.Zero(t, rdns.ipCache.Stats().Count)
}
func TestRDNS_WorkerLoop(t *testing.T) {
aghtest.ReplaceLogLevel(t, log.DEBUG)
w := &bytes.Buffer{}
aghtest.ReplaceLogWriter(t, w)
localIP := netip.MustParseAddr("192.168.1.1")
revIPv4, err := netutil.IPToReversedAddr(localIP.AsSlice())
require.NoError(t, err)
revIPv6, err := netutil.IPToReversedAddr(net.ParseIP("2a00:1450:400c:c06::93"))
require.NoError(t, err)
locUpstream := &aghtest.UpstreamMock{
OnAddress: func() (addr string) { return "local.upstream.example" },
OnExchange: func(req *dns.Msg) (resp *dns.Msg, err error) {
return aghalg.Coalesce(
aghtest.MatchedResponse(req, dns.TypePTR, revIPv4, "local.domain"),
aghtest.MatchedResponse(req, dns.TypePTR, revIPv6, "ipv6.domain"),
new(dns.Msg).SetRcode(req, dns.RcodeNameError),
), nil
},
}
errUpstream := aghtest.NewErrorUpstream()
testCases := []struct {
ups upstream.Upstream
cliIP netip.Addr
wantLog string
name string
wantClientSource clientSource
}{{
ups: locUpstream,
cliIP: localIP,
wantLog: "",
name: "all_good",
wantClientSource: ClientSourceRDNS,
}, {
ups: errUpstream,
cliIP: netip.MustParseAddr("192.168.1.2"),
wantLog: `rdns: resolving "192.168.1.2": test upstream error`,
name: "resolve_error",
wantClientSource: ClientSourceNone,
}, {
ups: locUpstream,
cliIP: netip.MustParseAddr("2a00:1450:400c:c06::93"),
wantLog: "",
name: "ipv6_good",
wantClientSource: ClientSourceRDNS,
}}
for _, tc := range testCases {
w.Reset()
cc := &clientsContainer{
list: map[string]*Client{},
idIndex: map[string]*Client{},
ipToRC: map[netip.Addr]*RuntimeClient{},
allTags: stringutil.NewSet(),
}
ch := make(chan netip.Addr)
rdns := &RDNS{
exchanger: &rDNSExchanger{
ex: tc.ups,
},
clients: cc,
ipCh: ch,
ipCache: cache.New(cache.Config{
EnableLRU: true,
MaxCount: revDNSCacheSize,
}),
}
t.Run(tc.name, func(t *testing.T) {
var wg sync.WaitGroup
wg.Add(1)
go func() {
rdns.workerLoop()
wg.Done()
}()
ch <- tc.cliIP
close(ch)
wg.Wait()
if tc.wantLog != "" {
assert.Contains(t, w.String(), tc.wantLog)
}
assert.Equal(t, tc.wantClientSource, cc.clientSource(tc.cliIP))
})
}
}