2017-10-30 13:17:49 +00:00
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// Copyright 2016 Google Inc. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// Binary dnsmasq_exporter is a Prometheus exporter for dnsmasq statistics.
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package main
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import (
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"flag"
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2021-10-06 15:31:00 +01:00
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"log"
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2017-10-30 13:17:49 +00:00
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"net/http"
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2023-06-20 11:00:26 +01:00
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"github.com/google/dnsmasq_exporter/collector"
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2017-10-30 13:17:49 +00:00
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"github.com/miekg/dns"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/client_golang/prometheus/promhttp"
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2020-10-11 22:42:22 +01:00
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"github.com/prometheus/common/version"
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2017-10-30 13:17:49 +00:00
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)
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var (
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listen = flag.String("listen",
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"localhost:9153",
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"listen address")
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2023-04-07 17:09:17 +01:00
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exposeLeases = flag.Bool("expose_leases",
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false,
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"expose dnsmasq leases as metrics (high cardinality)")
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2017-10-30 13:17:49 +00:00
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leasesPath = flag.String("leases_path",
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"/var/lib/misc/dnsmasq.leases",
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"path to the dnsmasq leases file")
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2018-05-05 13:58:07 +01:00
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dnsmasqAddr = flag.String("dnsmasq",
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"localhost:53",
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"dnsmasq host:port address")
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2018-05-06 14:12:19 +01:00
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metricsPath = flag.String("metrics_path",
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"/metrics",
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"path under which metrics are served")
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2017-10-30 13:17:49 +00:00
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)
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func init() {
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2020-10-11 22:42:22 +01:00
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prometheus.MustRegister(version.NewCollector("dnsmasq_exporter"))
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2017-10-30 13:17:49 +00:00
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}
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2023-06-20 11:00:26 +01:00
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func main() {
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flag.Parse()
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2017-10-30 13:17:49 +00:00
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2023-06-20 11:00:26 +01:00
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var (
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dnsClient = &dns.Client{
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SingleInflight: true,
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2018-05-05 14:00:19 +01:00
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}
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cfg = collector.Config{
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DnsClient: dnsClient,
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DnsmasqAddr: *dnsmasqAddr,
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LeasesPath: *leasesPath,
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ExposeLeases: *exposeLeases,
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2018-05-05 14:00:19 +01:00
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}
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2023-06-20 11:00:26 +01:00
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collector = collector.New(cfg)
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reg = prometheus.NewRegistry()
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)
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2023-04-07 17:09:17 +01:00
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2023-06-20 11:00:26 +01:00
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reg.MustRegister(collector)
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2018-05-05 14:00:19 +01:00
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2023-06-20 11:00:26 +01:00
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http.Handle(*metricsPath, promhttp.HandlerFor(
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prometheus.Gatherers{prometheus.DefaultGatherer, reg},
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promhttp.HandlerOpts{},
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))
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2018-05-06 14:12:19 +01:00
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http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
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w.Write([]byte(`<html>
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2021-10-06 15:31:00 +01:00
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<head><title>Dnsmasq Exporter</title></head>
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<body>
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<h1>Dnsmasq Exporter</h1>
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<p><a href="` + *metricsPath + `">Metrics</a></p>
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</body></html>`))
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2018-05-06 14:12:19 +01:00
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})
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2021-10-06 15:31:00 +01:00
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log.Println("Listening on", *listen)
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log.Println("Service metrics under", *metricsPath)
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2017-10-30 13:17:49 +00:00
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log.Fatal(http.ListenAndServe(*listen, nil))
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}
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