AdGuardHome/internal/querylog/http.go

262 lines
6.5 KiB
Go

package querylog
import (
"encoding/json"
"fmt"
"net"
"net/http"
"net/url"
"strconv"
"strings"
"time"
"github.com/AdguardTeam/AdGuardHome/internal/aghhttp"
"github.com/AdguardTeam/golibs/jsonutil"
"github.com/AdguardTeam/golibs/log"
"github.com/AdguardTeam/golibs/stringutil"
"github.com/AdguardTeam/golibs/timeutil"
"golang.org/x/net/idna"
)
type qlogConfig struct {
// Use float64 here to support fractional numbers and not mess the API
// users by changing the units.
Interval float64 `json:"interval"`
Enabled bool `json:"enabled"`
AnonymizeClientIP bool `json:"anonymize_client_ip"`
}
// Register web handlers
func (l *queryLog) initWeb() {
l.conf.HTTPRegister(http.MethodGet, "/control/querylog", l.handleQueryLog)
l.conf.HTTPRegister(http.MethodGet, "/control/querylog_info", l.handleQueryLogInfo)
l.conf.HTTPRegister(http.MethodPost, "/control/querylog_clear", l.handleQueryLogClear)
l.conf.HTTPRegister(http.MethodPost, "/control/querylog_config", l.handleQueryLogConfig)
}
func (l *queryLog) handleQueryLog(w http.ResponseWriter, r *http.Request) {
params, err := l.parseSearchParams(r)
if err != nil {
aghhttp.Error(r, w, http.StatusBadRequest, "failed to parse params: %s", err)
return
}
// search for the log entries
entries, oldest := l.search(params)
// convert log entries to JSON
data := l.entriesToJSON(entries, oldest)
jsonVal, err := json.Marshal(data)
if err != nil {
aghhttp.Error(
r,
w,
http.StatusInternalServerError,
"Couldn't marshal data into json: %s",
err,
)
return
}
w.Header().Set("Content-Type", "application/json")
_, err = w.Write(jsonVal)
if err != nil {
aghhttp.Error(r, w, http.StatusInternalServerError, "Unable to write response json: %s", err)
}
}
func (l *queryLog) handleQueryLogClear(_ http.ResponseWriter, _ *http.Request) {
l.clear()
}
// Get configuration
func (l *queryLog) handleQueryLogInfo(w http.ResponseWriter, r *http.Request) {
resp := qlogConfig{}
resp.Enabled = l.conf.Enabled
resp.Interval = l.conf.RotationIvl.Hours() / 24
resp.AnonymizeClientIP = l.conf.AnonymizeClientIP
jsonVal, err := json.Marshal(resp)
if err != nil {
aghhttp.Error(r, w, http.StatusInternalServerError, "json encode: %s", err)
return
}
w.Header().Set("Content-Type", "application/json")
_, err = w.Write(jsonVal)
if err != nil {
aghhttp.Error(r, w, http.StatusInternalServerError, "http write: %s", err)
}
}
// AnonymizeIP masks ip to anonymize the client if the ip is a valid one.
func AnonymizeIP(ip net.IP) {
// zeroes is a slice of zero bytes from which the IP address tail is copied.
// Using constant string as source of copying is more efficient than byte
// slice, see https://github.com/golang/go/issues/49997.
const zeroes = "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
if ip4 := ip.To4(); ip4 != nil {
copy(ip4[net.IPv4len-2:net.IPv4len], zeroes)
} else if len(ip) == net.IPv6len {
copy(ip[net.IPv6len-10:net.IPv6len], zeroes)
}
}
// Set configuration
func (l *queryLog) handleQueryLogConfig(w http.ResponseWriter, r *http.Request) {
d := &qlogConfig{}
req, err := jsonutil.DecodeObject(d, r.Body)
if err != nil {
aghhttp.Error(r, w, http.StatusBadRequest, "%s", err)
return
}
ivl := time.Duration(float64(timeutil.Day) * d.Interval)
if req.Exists("interval") && !checkInterval(ivl) {
aghhttp.Error(r, w, http.StatusBadRequest, "Unsupported interval")
return
}
defer l.conf.ConfigModified()
l.lock.Lock()
defer l.lock.Unlock()
// Copy data, modify it, then activate. Other threads (readers) don't need
// to use this lock.
conf := *l.conf
if req.Exists("enabled") {
conf.Enabled = d.Enabled
}
if req.Exists("interval") {
conf.RotationIvl = ivl
}
if req.Exists("anonymize_client_ip") {
if conf.AnonymizeClientIP = d.AnonymizeClientIP; conf.AnonymizeClientIP {
l.anonymizer.Store(AnonymizeIP)
} else {
l.anonymizer.Store(nil)
}
}
l.conf = &conf
}
// "value" -> value, return TRUE
func getDoubleQuotesEnclosedValue(s *string) bool {
t := *s
if len(t) >= 2 && t[0] == '"' && t[len(t)-1] == '"' {
*s = t[1 : len(t)-1]
return true
}
return false
}
// parseSearchCriterion parses a search criterion from the query parameter.
func (l *queryLog) parseSearchCriterion(q url.Values, name string, ct criterionType) (
ok bool,
sc searchCriterion,
err error,
) {
val := q.Get(name)
if val == "" {
return false, sc, nil
}
strict := getDoubleQuotesEnclosedValue(&val)
var asciiVal string
switch ct {
case ctTerm:
// Decode lowercased value from punycode to make EqualFold and
// friends work properly with IDNAs.
//
// TODO(e.burkov): Make it work with parts of IDNAs somehow.
loweredVal := strings.ToLower(val)
if asciiVal, err = idna.ToASCII(loweredVal); err != nil {
log.Debug("can't convert %q to ascii: %s", val, err)
} else if asciiVal == loweredVal {
// Purge asciiVal to prevent checking the same value
// twice.
asciiVal = ""
}
case ctFilteringStatus:
if !stringutil.InSlice(filteringStatusValues, val) {
return false, sc, fmt.Errorf("invalid value %s", val)
}
default:
return false, sc, fmt.Errorf(
"invalid criterion type %v: should be one of %v",
ct,
[]criterionType{ctTerm, ctFilteringStatus},
)
}
sc = searchCriterion{
criterionType: ct,
value: val,
asciiVal: asciiVal,
strict: strict,
}
return true, sc, nil
}
// parseSearchParams - parses "searchParams" from the HTTP request's query string
func (l *queryLog) parseSearchParams(r *http.Request) (p *searchParams, err error) {
p = newSearchParams()
q := r.URL.Query()
olderThan := q.Get("older_than")
if len(olderThan) != 0 {
p.olderThan, err = time.Parse(time.RFC3339Nano, olderThan)
if err != nil {
return nil, err
}
}
var limit64 int64
if limit64, err = strconv.ParseInt(q.Get("limit"), 10, 64); err == nil {
p.limit = int(limit64)
}
var offset64 int64
if offset64, err = strconv.ParseInt(q.Get("offset"), 10, 64); err == nil {
p.offset = int(offset64)
// If we don't use "olderThan" and use offset/limit instead, we should change the default behavior
// and scan all log records until we found enough log entries
p.maxFileScanEntries = 0
}
for _, v := range []struct {
urlField string
ct criterionType
}{{
urlField: "search",
ct: ctTerm,
}, {
urlField: "response_status",
ct: ctFilteringStatus,
}} {
var ok bool
var c searchCriterion
ok, c, err = l.parseSearchCriterion(q, v.urlField, v.ct)
if err != nil {
return nil, err
}
if ok {
p.searchCriteria = append(p.searchCriteria, c)
}
}
return p, nil
}