382 lines
14 KiB
Go
382 lines
14 KiB
Go
package filtering
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import (
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"bytes"
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"context"
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"encoding/binary"
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"encoding/gob"
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"encoding/json"
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"fmt"
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"net"
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"net/http"
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"time"
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"github.com/AdguardTeam/AdGuardHome/internal/aghhttp"
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"github.com/AdguardTeam/golibs/cache"
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"github.com/AdguardTeam/golibs/log"
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)
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/*
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expire byte[4]
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res Result
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*/
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func (d *DNSFilter) setCacheResult(cache cache.Cache, host string, res Result) int {
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var buf bytes.Buffer
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expire := uint(time.Now().Unix()) + d.Config.CacheTime*60
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exp := make([]byte, 4)
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binary.BigEndian.PutUint32(exp, uint32(expire))
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_, _ = buf.Write(exp)
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enc := gob.NewEncoder(&buf)
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err := enc.Encode(res)
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if err != nil {
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log.Error("gob.Encode(): %s", err)
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return 0
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}
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val := buf.Bytes()
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_ = cache.Set([]byte(host), val)
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return len(val)
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}
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func getCachedResult(cache cache.Cache, host string) (Result, bool) {
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data := cache.Get([]byte(host))
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if data == nil {
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return Result{}, false
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}
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exp := int(binary.BigEndian.Uint32(data[:4]))
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if exp <= int(time.Now().Unix()) {
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cache.Del([]byte(host))
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return Result{}, false
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}
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var buf bytes.Buffer
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buf.Write(data[4:])
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dec := gob.NewDecoder(&buf)
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r := Result{}
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err := dec.Decode(&r)
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if err != nil {
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log.Debug("gob.Decode(): %s", err)
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return Result{}, false
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}
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return r, true
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}
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// SafeSearchDomain returns replacement address for search engine
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func (d *DNSFilter) SafeSearchDomain(host string) (string, bool) {
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val, ok := safeSearchDomains[host]
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return val, ok
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}
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func (d *DNSFilter) checkSafeSearch(
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host string,
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_ uint16,
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setts *Settings,
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) (res Result, err error) {
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if !setts.ProtectionEnabled || !setts.SafeSearchEnabled {
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return Result{}, nil
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}
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if log.GetLevel() >= log.DEBUG {
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timer := log.StartTimer()
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defer timer.LogElapsed("SafeSearch: lookup for %s", host)
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}
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// Check cache. Return cached result if it was found
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cachedValue, isFound := getCachedResult(d.safeSearchCache, host)
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if isFound {
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// atomic.AddUint64(&gctx.stats.Safesearch.CacheHits, 1)
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log.Tracef("SafeSearch: found in cache: %s", host)
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return cachedValue, nil
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}
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safeHost, ok := d.SafeSearchDomain(host)
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if !ok {
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return Result{}, nil
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}
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res = Result{
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IsFiltered: true,
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Reason: FilteredSafeSearch,
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Rules: []*ResultRule{{
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FilterListID: SafeSearchListID,
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}},
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}
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if ip := net.ParseIP(safeHost); ip != nil {
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res.Rules[0].IP = ip
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valLen := d.setCacheResult(d.safeSearchCache, host, res)
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log.Debug("SafeSearch: stored in cache: %s (%d bytes)", host, valLen)
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return res, nil
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}
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ips, err := d.resolver.LookupIP(context.Background(), "ip", safeHost)
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if err != nil {
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log.Tracef("SafeSearchDomain for %s was found but failed to lookup for %s cause %s", host, safeHost, err)
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return Result{}, err
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}
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for _, ip := range ips {
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if ip = ip.To4(); ip == nil {
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continue
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}
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res.Rules[0].IP = ip
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l := d.setCacheResult(d.safeSearchCache, host, res)
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log.Debug("SafeSearch: stored in cache: %s (%d bytes)", host, l)
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return res, nil
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}
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return Result{}, fmt.Errorf("no ipv4 addresses in safe search response for %s", safeHost)
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}
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func (d *DNSFilter) handleSafeSearchEnable(w http.ResponseWriter, r *http.Request) {
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d.Config.SafeSearchEnabled = true
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d.Config.ConfigModified()
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}
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func (d *DNSFilter) handleSafeSearchDisable(w http.ResponseWriter, r *http.Request) {
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d.Config.SafeSearchEnabled = false
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d.Config.ConfigModified()
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}
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func (d *DNSFilter) handleSafeSearchStatus(w http.ResponseWriter, r *http.Request) {
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w.Header().Set("Content-Type", "application/json")
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err := json.NewEncoder(w).Encode(&struct {
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Enabled bool `json:"enabled"`
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}{
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Enabled: d.Config.SafeSearchEnabled,
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})
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if err != nil {
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aghhttp.Error(
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r,
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w,
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http.StatusInternalServerError,
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"Unable to write response json: %s",
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err,
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)
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}
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}
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var safeSearchDomains = map[string]string{
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"yandex.com": "213.180.193.56",
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"yandex.ru": "213.180.193.56",
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"yandex.ua": "213.180.193.56",
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"yandex.by": "213.180.193.56",
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"yandex.kz": "213.180.193.56",
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"www.yandex.com": "213.180.193.56",
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"www.yandex.ru": "213.180.193.56",
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"www.yandex.ua": "213.180.193.56",
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"www.yandex.by": "213.180.193.56",
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"www.yandex.kz": "213.180.193.56",
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"www.bing.com": "strict.bing.com",
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"duckduckgo.com": "safe.duckduckgo.com",
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"www.duckduckgo.com": "safe.duckduckgo.com",
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"start.duckduckgo.com": "safe.duckduckgo.com",
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"www.google.com": "forcesafesearch.google.com",
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"www.google.ad": "forcesafesearch.google.com",
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"www.google.ae": "forcesafesearch.google.com",
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"www.google.com.af": "forcesafesearch.google.com",
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"www.google.com.ag": "forcesafesearch.google.com",
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"www.google.com.ai": "forcesafesearch.google.com",
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"www.google.al": "forcesafesearch.google.com",
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"www.google.am": "forcesafesearch.google.com",
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"www.google.co.ao": "forcesafesearch.google.com",
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"www.google.com.ar": "forcesafesearch.google.com",
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"www.google.as": "forcesafesearch.google.com",
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"www.google.at": "forcesafesearch.google.com",
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"www.google.com.au": "forcesafesearch.google.com",
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"www.google.az": "forcesafesearch.google.com",
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"www.google.ba": "forcesafesearch.google.com",
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"www.google.com.bd": "forcesafesearch.google.com",
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"www.google.be": "forcesafesearch.google.com",
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"www.google.bf": "forcesafesearch.google.com",
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"www.google.bg": "forcesafesearch.google.com",
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"www.google.com.bh": "forcesafesearch.google.com",
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"www.google.bi": "forcesafesearch.google.com",
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"www.google.bj": "forcesafesearch.google.com",
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"www.google.com.bn": "forcesafesearch.google.com",
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"www.google.com.bo": "forcesafesearch.google.com",
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"www.google.com.br": "forcesafesearch.google.com",
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"www.google.bs": "forcesafesearch.google.com",
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"www.google.bt": "forcesafesearch.google.com",
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"www.google.co.bw": "forcesafesearch.google.com",
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"www.google.by": "forcesafesearch.google.com",
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"www.google.com.bz": "forcesafesearch.google.com",
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"www.google.ca": "forcesafesearch.google.com",
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"www.google.cd": "forcesafesearch.google.com",
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"www.google.cf": "forcesafesearch.google.com",
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"www.google.cg": "forcesafesearch.google.com",
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"www.google.ch": "forcesafesearch.google.com",
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"www.google.ci": "forcesafesearch.google.com",
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"www.google.co.ck": "forcesafesearch.google.com",
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"www.google.cl": "forcesafesearch.google.com",
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"www.google.cm": "forcesafesearch.google.com",
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"www.google.cn": "forcesafesearch.google.com",
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"www.google.com.co": "forcesafesearch.google.com",
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"www.google.co.cr": "forcesafesearch.google.com",
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"www.google.com.cu": "forcesafesearch.google.com",
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"www.google.cv": "forcesafesearch.google.com",
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"www.google.com.cy": "forcesafesearch.google.com",
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"www.google.cz": "forcesafesearch.google.com",
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"www.google.de": "forcesafesearch.google.com",
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"www.google.dj": "forcesafesearch.google.com",
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"www.google.dk": "forcesafesearch.google.com",
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"www.google.dm": "forcesafesearch.google.com",
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"www.google.com.do": "forcesafesearch.google.com",
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"www.google.dz": "forcesafesearch.google.com",
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"www.google.com.ec": "forcesafesearch.google.com",
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"www.google.ee": "forcesafesearch.google.com",
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"www.google.com.eg": "forcesafesearch.google.com",
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"www.google.es": "forcesafesearch.google.com",
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"www.google.com.et": "forcesafesearch.google.com",
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"www.google.fi": "forcesafesearch.google.com",
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"www.google.com.fj": "forcesafesearch.google.com",
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"www.google.fm": "forcesafesearch.google.com",
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"www.google.fr": "forcesafesearch.google.com",
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"www.google.ga": "forcesafesearch.google.com",
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"www.google.ge": "forcesafesearch.google.com",
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"www.google.gg": "forcesafesearch.google.com",
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"www.google.com.gh": "forcesafesearch.google.com",
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"www.google.com.gi": "forcesafesearch.google.com",
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"www.google.gl": "forcesafesearch.google.com",
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"www.google.gm": "forcesafesearch.google.com",
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"www.google.gp": "forcesafesearch.google.com",
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"www.google.gr": "forcesafesearch.google.com",
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"www.google.com.gt": "forcesafesearch.google.com",
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"www.google.gy": "forcesafesearch.google.com",
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"www.google.com.hk": "forcesafesearch.google.com",
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"www.google.hn": "forcesafesearch.google.com",
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"www.google.hr": "forcesafesearch.google.com",
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"www.google.ht": "forcesafesearch.google.com",
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"www.google.hu": "forcesafesearch.google.com",
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"www.google.co.id": "forcesafesearch.google.com",
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"www.google.ie": "forcesafesearch.google.com",
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"www.google.co.il": "forcesafesearch.google.com",
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"www.google.im": "forcesafesearch.google.com",
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"www.google.co.in": "forcesafesearch.google.com",
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"www.google.iq": "forcesafesearch.google.com",
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"www.google.is": "forcesafesearch.google.com",
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"www.google.it": "forcesafesearch.google.com",
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"www.google.je": "forcesafesearch.google.com",
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"www.google.com.jm": "forcesafesearch.google.com",
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"www.google.jo": "forcesafesearch.google.com",
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"www.google.co.jp": "forcesafesearch.google.com",
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"www.google.co.ke": "forcesafesearch.google.com",
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"www.google.com.kh": "forcesafesearch.google.com",
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"www.google.ki": "forcesafesearch.google.com",
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"www.google.kg": "forcesafesearch.google.com",
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"www.google.co.kr": "forcesafesearch.google.com",
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"www.google.com.kw": "forcesafesearch.google.com",
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"www.google.kz": "forcesafesearch.google.com",
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"www.google.la": "forcesafesearch.google.com",
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"www.google.com.lb": "forcesafesearch.google.com",
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"www.google.li": "forcesafesearch.google.com",
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"www.google.lk": "forcesafesearch.google.com",
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"www.google.co.ls": "forcesafesearch.google.com",
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"www.google.lt": "forcesafesearch.google.com",
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"www.google.lu": "forcesafesearch.google.com",
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"www.google.lv": "forcesafesearch.google.com",
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"www.google.com.ly": "forcesafesearch.google.com",
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"www.google.co.ma": "forcesafesearch.google.com",
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"www.google.md": "forcesafesearch.google.com",
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"www.google.me": "forcesafesearch.google.com",
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"www.google.mg": "forcesafesearch.google.com",
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"www.google.mk": "forcesafesearch.google.com",
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"www.google.ml": "forcesafesearch.google.com",
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"www.google.com.mm": "forcesafesearch.google.com",
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"www.google.mn": "forcesafesearch.google.com",
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"www.google.ms": "forcesafesearch.google.com",
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"www.google.com.mt": "forcesafesearch.google.com",
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"www.google.mu": "forcesafesearch.google.com",
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"www.google.mv": "forcesafesearch.google.com",
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"www.google.mw": "forcesafesearch.google.com",
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"www.google.com.mx": "forcesafesearch.google.com",
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"www.google.com.my": "forcesafesearch.google.com",
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"www.google.co.mz": "forcesafesearch.google.com",
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"www.google.com.na": "forcesafesearch.google.com",
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"www.google.com.nf": "forcesafesearch.google.com",
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"www.google.com.ng": "forcesafesearch.google.com",
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"www.google.com.ni": "forcesafesearch.google.com",
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"www.google.ne": "forcesafesearch.google.com",
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"www.google.nl": "forcesafesearch.google.com",
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"www.google.no": "forcesafesearch.google.com",
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"www.google.com.np": "forcesafesearch.google.com",
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"www.google.nr": "forcesafesearch.google.com",
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"www.google.nu": "forcesafesearch.google.com",
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"www.google.co.nz": "forcesafesearch.google.com",
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"www.google.com.om": "forcesafesearch.google.com",
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"www.google.com.pa": "forcesafesearch.google.com",
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"www.google.com.pe": "forcesafesearch.google.com",
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"www.google.com.pg": "forcesafesearch.google.com",
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"www.google.com.ph": "forcesafesearch.google.com",
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"www.google.com.pk": "forcesafesearch.google.com",
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"www.google.pl": "forcesafesearch.google.com",
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"www.google.pn": "forcesafesearch.google.com",
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"www.google.com.pr": "forcesafesearch.google.com",
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"www.google.ps": "forcesafesearch.google.com",
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"www.google.pt": "forcesafesearch.google.com",
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"www.google.com.py": "forcesafesearch.google.com",
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"www.google.com.qa": "forcesafesearch.google.com",
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"www.google.ro": "forcesafesearch.google.com",
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"www.google.ru": "forcesafesearch.google.com",
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"www.google.rw": "forcesafesearch.google.com",
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"www.google.com.sa": "forcesafesearch.google.com",
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"www.google.com.sb": "forcesafesearch.google.com",
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"www.google.sc": "forcesafesearch.google.com",
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"www.google.se": "forcesafesearch.google.com",
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"www.google.com.sg": "forcesafesearch.google.com",
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"www.google.sh": "forcesafesearch.google.com",
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"www.google.si": "forcesafesearch.google.com",
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"www.google.sk": "forcesafesearch.google.com",
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"www.google.com.sl": "forcesafesearch.google.com",
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"www.google.sn": "forcesafesearch.google.com",
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"www.google.so": "forcesafesearch.google.com",
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"www.google.sm": "forcesafesearch.google.com",
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"www.google.sr": "forcesafesearch.google.com",
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"www.google.st": "forcesafesearch.google.com",
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"www.google.com.sv": "forcesafesearch.google.com",
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"www.google.td": "forcesafesearch.google.com",
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"www.google.tg": "forcesafesearch.google.com",
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"www.google.co.th": "forcesafesearch.google.com",
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"www.google.com.tj": "forcesafesearch.google.com",
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"www.google.tk": "forcesafesearch.google.com",
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"www.google.tl": "forcesafesearch.google.com",
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"www.google.tm": "forcesafesearch.google.com",
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"www.google.tn": "forcesafesearch.google.com",
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"www.google.to": "forcesafesearch.google.com",
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"www.google.com.tr": "forcesafesearch.google.com",
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"www.google.tt": "forcesafesearch.google.com",
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"www.google.com.tw": "forcesafesearch.google.com",
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"www.google.co.tz": "forcesafesearch.google.com",
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"www.google.com.ua": "forcesafesearch.google.com",
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"www.google.co.ug": "forcesafesearch.google.com",
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"www.google.co.uk": "forcesafesearch.google.com",
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"www.google.com.uy": "forcesafesearch.google.com",
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"www.google.co.uz": "forcesafesearch.google.com",
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"www.google.com.vc": "forcesafesearch.google.com",
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"www.google.co.ve": "forcesafesearch.google.com",
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"www.google.vg": "forcesafesearch.google.com",
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"www.google.co.vi": "forcesafesearch.google.com",
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"www.google.com.vn": "forcesafesearch.google.com",
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"www.google.vu": "forcesafesearch.google.com",
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"www.google.ws": "forcesafesearch.google.com",
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"www.google.rs": "forcesafesearch.google.com",
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"www.youtube.com": "restrictmoderate.youtube.com",
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"m.youtube.com": "restrictmoderate.youtube.com",
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"youtubei.googleapis.com": "restrictmoderate.youtube.com",
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"youtube.googleapis.com": "restrictmoderate.youtube.com",
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"www.youtube-nocookie.com": "restrictmoderate.youtube.com",
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"pixabay.com": "safesearch.pixabay.com",
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}
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