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// SPDX-License-Identifier: GPL-3.0-or-later
package pihole
import (
"encoding/json"
"fmt"
"io"
"net/http"
"net/url"
"strings"
"sync"
"time"
"github.com/netdata/netdata/go/go.d.plugin/pkg/web"
)
const wantAPIVersion = 3
const (
urlPathAPI = "/admin/api.php"
urlQueryKeyAuth = "auth"
urlQueryKeyAPIVersion = "version"
urlQueryKeySummaryRaw = "summaryRaw"
urlQueryKeyGetQueryTypes = "getQueryTypes" // need auth
urlQueryKeyGetForwardDestinations = "getForwardDestinations" // need auth
)
const (
precision = 1000
)
func (p *Pihole) collect() (map[string]int64, error) {
if p.checkVersion {
ver, err := p.queryAPIVersion()
if err != nil {
return nil, err
}
if ver != wantAPIVersion {
return nil, fmt.Errorf("API version: %d, supported version: %d", ver, wantAPIVersion)
}
p.checkVersion = false
}
pmx := new(piholeMetrics)
p.queryMetrics(pmx, true)
if pmx.hasQueryTypes() {
p.addQueriesTypesOnce.Do(p.addChartDNSQueriesType)
}
if pmx.hasForwarders() {
p.addFwsDestinationsOnce.Do(p.addChartDNSQueriesForwardedDestinations)
}
mx := make(map[string]int64)
p.collectMetrics(mx, pmx)
return mx, nil
}
func (p *Pihole) collectMetrics(mx map[string]int64, pmx *piholeMetrics) {
if pmx.hasSummary() {
mx["ads_blocked_today"] = pmx.summary.AdsBlockedToday
mx["ads_percentage_today"] = int64(pmx.summary.AdsPercentageToday * 100)
mx["domains_being_blocked"] = pmx.summary.DomainsBeingBlocked
// GravityLastUpdated.Absolute is <nil> if the file does not exist (deleted/moved)
if pmx.summary.GravityLastUpdated.Absolute != nil {
mx["blocklist_last_update"] = time.Now().Unix() - *pmx.summary.GravityLastUpdated.Absolute
}
mx["dns_queries_today"] = pmx.summary.DNSQueriesToday
mx["queries_forwarded"] = pmx.summary.QueriesForwarded
mx["queries_cached"] = pmx.summary.QueriesCached
mx["unique_clients"] = pmx.summary.UniqueClients
mx["blocking_status_enabled"] = boolToInt(pmx.summary.Status == "enabled")
mx["blocking_status_disabled"] = boolToInt(pmx.summary.Status != "enabled")
tot := pmx.summary.QueriesCached + pmx.summary.AdsBlockedToday + pmx.summary.QueriesForwarded
mx["queries_cached_perc"] = calcPercentage(pmx.summary.QueriesCached, tot)
mx["ads_blocked_today_perc"] = calcPercentage(pmx.summary.AdsBlockedToday, tot)
mx["queries_forwarded_perc"] = calcPercentage(pmx.summary.QueriesForwarded, tot)
}
if pmx.hasQueryTypes() {
mx["A"] = int64(pmx.queryTypes.Types.A * 100)
mx["AAAA"] = int64(pmx.queryTypes.Types.AAAA * 100)
mx["ANY"] = int64(pmx.queryTypes.Types.ANY * 100)
mx["PTR"] = int64(pmx.queryTypes.Types.PTR * 100)
mx["SOA"] = int64(pmx.queryTypes.Types.SOA * 100)
mx["SRV"] = int64(pmx.queryTypes.Types.SRV * 100)
mx["TXT"] = int64(pmx.queryTypes.Types.TXT * 100)
}
if pmx.hasForwarders() {
for k, v := range pmx.forwarders.Destinations {
name := strings.Split(k, "|")[0]
mx["destination_"+name] = int64(v * 100)
}
}
}
func (p *Pihole) queryMetrics(pmx *piholeMetrics, doConcurrently bool) {
type task func(*piholeMetrics)
var tasks = []task{p.querySummary}
if p.Password != "" {
tasks = []task{
p.querySummary,
p.queryQueryTypes,
p.queryForwardedDestinations,
}
}
wg := &sync.WaitGroup{}
wrap := func(call task) task {
return func(metrics *piholeMetrics) { call(metrics); wg.Done() }
}
for _, task := range tasks {
if doConcurrently {
wg.Add(1)
task = wrap(task)
go task(pmx)
} else {
task(pmx)
}
}
wg.Wait()
}
func (p *Pihole) querySummary(pmx *piholeMetrics) {
req, err := web.NewHTTPRequest(p.Request)
if err != nil {
p.Error(err)
return
}
req.URL.Path = urlPathAPI
req.URL.RawQuery = url.Values{
urlQueryKeyAuth: []string{p.Password},
urlQueryKeySummaryRaw: []string{"true"},
}.Encode()
var v summaryRawMetrics
if err = p.doWithDecode(&v, req); err != nil {
p.Error(err)
return
}
pmx.summary = &v
}
func (p *Pihole) queryQueryTypes(pmx *piholeMetrics) {
req, err := web.NewHTTPRequest(p.Request)
if err != nil {
p.Error(err)
return
}
req.URL.Path = urlPathAPI
req.URL.RawQuery = url.Values{
urlQueryKeyAuth: []string{p.Password},
urlQueryKeyGetQueryTypes: []string{"true"},
}.Encode()
var v queryTypesMetrics
err = p.doWithDecode(&v, req)
if err != nil {
p.Error(err)
return
}
pmx.queryTypes = &v
}
func (p *Pihole) queryForwardedDestinations(pmx *piholeMetrics) {
req, err := web.NewHTTPRequest(p.Request)
if err != nil {
p.Error(err)
return
}
req.URL.Path = urlPathAPI
req.URL.RawQuery = url.Values{
urlQueryKeyAuth: []string{p.Password},
urlQueryKeyGetForwardDestinations: []string{"true"},
}.Encode()
var v forwardDestinations
err = p.doWithDecode(&v, req)
if err != nil {
p.Error(err)
return
}
pmx.forwarders = &v
}
func (p *Pihole) queryAPIVersion() (int, error) {
req, err := web.NewHTTPRequest(p.Request)
if err != nil {
return 0, err
}
req.URL.Path = urlPathAPI
req.URL.RawQuery = url.Values{
urlQueryKeyAuth: []string{p.Password},
urlQueryKeyAPIVersion: []string{"true"},
}.Encode()
var v piholeAPIVersion
err = p.doWithDecode(&v, req)
if err != nil {
return 0, err
}
return v.Version, nil
}
func (p *Pihole) doWithDecode(dst interface{}, req *http.Request) error {
resp, err := p.httpClient.Do(req)
if err != nil {
return err
}
defer closeBody(resp)
if resp.StatusCode != http.StatusOK {
return fmt.Errorf("%s returned %d status code", req.URL, resp.StatusCode)
}
content, err := io.ReadAll(resp.Body)
if err != nil {
return fmt.Errorf("error on reading response from %s : %v", req.URL, err)
}
// empty array if unauthorized query or wrong query
if isEmptyArray(content) {
return fmt.Errorf("unauthorized access to %s", req.URL)
}
if err := json.Unmarshal(content, dst); err != nil {
return fmt.Errorf("error on parsing response from %s : %v", req.URL, err)
}
return nil
}
func isEmptyArray(data []byte) bool {
empty := "[]"
return len(data) == len(empty) && string(data) == empty
}
func closeBody(resp *http.Response) {
if resp != nil && resp.Body != nil {
_, _ = io.Copy(io.Discard, resp.Body)
_ = resp.Body.Close()
}
}
func boolToInt(b bool) int64 {
if !b {
return 0
}
return 1
}
func calcPercentage(value, total int64) (v int64) {
if total == 0 {
return 0
}
return int64(float64(value) * 100 / float64(total) * precision)
}
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