added support to resolve rdns from adguard (#14)

config/configuration.go

@@ -24,6 +24,7 @@ type Config struct {
 	ServerPort      string        `config:"server_port"`
 	Interval        time.Duration `config:"interval"`
 	LogLimit        string        `config:"log_limit"`
+	RDnsEnabled     bool          `config:"rdns_enabled"`
 }
 
 func getDefaultConfig() *Config {
@@ -36,6 +37,7 @@ func getDefaultConfig() *Config {
 		ServerPort:      "9617",
 		Interval:        10 * time.Second,
 		LogLimit:        "1000",
+		RDnsEnabled:     true,
 	}
 }
 

internal/adguard/client.go

@@ -6,8 +6,10 @@ import (
 	"fmt"
 	"io/ioutil"
 	"log"
+	"net"
 	"net/http"
 	"strconv"
+	"strings"
 	"time"
 
 	"github.com/ebrianne/adguard-exporter/internal/metrics"
@@ -19,6 +21,7 @@ var (
 	statusURLPattern      = "%s://%s:%d/control/status"
 	statsURLPattern       = "%s://%s:%d/control/stats"
 	logstatsURLPattern    = "%s://%s:%d/control/querylog?limit=%s&response_status=\"all\""
+	resolveRDNSURLPattern = "%s://%s:%d/control/clients/find?%s"
 	m                     map[string]int
 )
 
@@ -32,10 +35,11 @@ type Client struct {
 	port        uint16
 	username    string
 	password    string
+	rdnsenabled bool
 }
 
 // NewClient method initializes a new AdGuard  client.
-func NewClient(protocol, hostname, username, password, adport string, interval time.Duration, logLimit string) *Client {
+func NewClient(protocol, hostname, username, password, adport string, interval time.Duration, logLimit string, rdnsenabled bool) *Client {
 
 	temp, err := strconv.Atoi(adport)
 	if err != nil {
@@ -57,6 +61,7 @@ func NewClient(protocol, hostname, username, password, adport string, interval t
 				return http.ErrUseLastResponse
 			},
 		},
+		rdnsenabled: rdnsenabled,
 	}
 }
 
@@ -67,14 +72,14 @@ func (c *Client) Scrape() {
 
 		allstats := c.getStatistics()
 		//Set the metrics
-		c.setMetrics(allstats.status, allstats.stats, allstats.logStats)
+		c.setMetrics(allstats.status, allstats.stats, allstats.logStats, allstats.rdns)
 
 		log.Printf("New tick of statistics: %s", allstats.stats.ToString())
 	}
 }
 
 // Function to set the prometheus metrics
-func (c *Client) setMetrics(status *Status, stats *Stats, logstats *LogStats) {
+func (c *Client) setMetrics(status *Status, stats *Stats, logstats *LogStats, rdns map[string]string) {
 	//Status
 	var isRunning int = 0
 	if status.Running == true {
@@ -110,7 +115,15 @@ func (c *Client) setMetrics(status *Status, stats *Stats, logstats *LogStats) {
 
 	for l := range stats.TopClients {
 		for source, value := range stats.TopClients[l] {
+			if c.rdnsenabled && isValidIp(source) {
+				hostName, exists := rdns[source]
+				if exists {
+					metrics.TopClients.WithLabelValues(c.hostname, hostName).Set(float64(value))
+					continue
+				}
+			}
 			metrics.TopClients.WithLabelValues(c.hostname, source).Set(float64(value))
+
 		}
 	}
 
@@ -181,6 +194,34 @@ func (c *Client) getStatistics() *AllStats {
 	allstats.stats = &stats
 	allstats.logStats = &logstats
 
+	if c.rdnsenabled {
+		var sb strings.Builder
+		for l := range stats.TopClients {
+			for source, _ := range stats.TopClients[l] {
+				sb.WriteString(fmt.Sprintf("ip%d=%s", l, source))
+				if l < len(stats.TopClients)-1 {
+					sb.WriteString("&")
+				}
+			}
+		}
+		rdnsURL := fmt.Sprintf(resolveRDNSURLPattern, c.protocol, c.hostname, c.port, sb.String())
+		body = c.MakeRequest(rdnsURL)
+		var results []map[string]interface{}
+		err = json.Unmarshal(body, &results)
+		if err != nil {
+			log.Println("Unable to unmarshal Reverse DNS", err)
+		}
+
+		rdnsData := make(map[string]string)
+		for _, result := range results {
+			for key := range result {
+				data := result[key].(map[string]interface{})
+				rdnsData[key] = data["name"].(string)
+			}
+		}
+		allstats.rdns = rdnsData
+	}
+
 	return &allstats
 }
 
@@ -227,3 +268,11 @@ func GetTlsConfig() *tls.Config {
 		InsecureSkipVerify: true,
 	}
 }
+
+func isValidIp(ip string) bool {
+	if net.ParseIP(ip) == nil {
+		return false
+	} else {
+		return true
+	}
+}

internal/adguard/model.go

@@ -7,6 +7,7 @@ type AllStats struct {
 	status   *Status
 	stats    *Stats
 	logStats *LogStats
+	rdns     map[string]string
 }
 
 // Status struct is the Adguard statistics JSON API corresponding model.

main.go

@@ -26,14 +26,14 @@ func main() {
 
 	metrics.Init()
 
-	initAdguardClient(conf.AdguardProtocol, conf.AdguardHostname, conf.AdguardUsername, conf.AdguardPassword, conf.AdguardPort, conf.Interval, conf.LogLimit)
+	initAdguardClient(conf.AdguardProtocol, conf.AdguardHostname, conf.AdguardUsername, conf.AdguardPassword, conf.AdguardPort, conf.Interval, conf.LogLimit, conf.RDnsEnabled)
 	initHttpServer(conf.ServerPort)
 
 	handleExitSignal()
 }
 
-func initAdguardClient(protocol, hostname, username, password, port string, interval time.Duration, logLimit string) {
-	client := adguard.NewClient(protocol, hostname, username, password, port, interval, logLimit)
+func initAdguardClient(protocol, hostname, username, password, port string, interval time.Duration, logLimit string, rdnsenabled bool) {
+	client := adguard.NewClient(protocol, hostname, username, password, port, interval, logLimit, rdnsenabled)
 	go client.Scrape()
 }