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ssh_exporter.go
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/
ssh_exporter.go
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// Copyright 2020 Trey Dockendorf
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package main
import (
"fmt"
"net/http"
"os"
"github.com/alecthomas/kingpin/v2"
"github.com/go-kit/log"
"github.com/go-kit/log/level"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promhttp"
"github.com/prometheus/common/promlog"
"github.com/prometheus/common/promlog/flag"
"github.com/prometheus/common/version"
"github.com/treydock/ssh_exporter/collector"
"github.com/treydock/ssh_exporter/config"
)
const (
sshEndpoint = "/ssh"
metricsEndpoint = "/metrics"
)
var (
configFile = kingpin.Flag("config.file", "Path to exporter config file").Default("ssh_exporter.yaml").String()
listenAddress = kingpin.Flag("web.listen-address", "Address to listen on for web interface and telemetry.").Default(":9312").String()
)
func metricsHandler(c *config.Config, logger log.Logger) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
registry := prometheus.NewRegistry()
t := r.URL.Query().Get("target")
if t == "" {
http.Error(w, "'target' parameter must be specified", http.StatusBadRequest)
return
}
m := r.URL.Query().Get("module")
if m == "" {
m = "default"
}
module, ok := c.Modules[m]
if !ok {
http.Error(w, fmt.Sprintf("Unknown module %s", t), http.StatusNotFound)
return
}
level.Debug(logger).Log("msg", "Loaded module", "module", module.ModuleName)
target := &config.Target{
Host: t,
User: module.User,
Password: module.Password,
PrivateKey: module.PrivateKey,
Certificate: module.Certificate,
KnownHosts: module.KnownHosts,
HostKeyAlgorithms: module.HostKeyAlgorithms,
Timeout: module.Timeout,
Command: module.Command,
CommandExpect: module.CommandExpect,
OutputMetric: module.OutputMetric,
OutputTruncate: module.OutputTruncate,
}
sshCollector := collector.NewCollector(target, log.With(logger, "target", target.Host))
registry.MustRegister(sshCollector)
gatherers := prometheus.Gatherers{registry}
// Delegate http serving to Prometheus client library, which will call collector.Collect.
h := promhttp.HandlerFor(gatherers, promhttp.HandlerOpts{})
h.ServeHTTP(w, r)
}
}
func run(logger log.Logger) {
level.Info(logger).Log("msg", "Starting ssh_exporter", "version", version.Info())
level.Info(logger).Log("msg", "Build context", "build_context", version.BuildContext())
level.Info(logger).Log("msg", "Starting Server", "address", *listenAddress)
sc := &config.SafeConfig{}
if err := sc.ReloadConfig(*configFile); err != nil {
level.Error(logger).Log("msg", "Error loading config", "err", err)
os.Exit(1)
}
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
//nolint:errcheck
w.Write([]byte(`<html>
<head><title>SSH Exporter</title></head>
<body>
<h1>SSH Exporter</h1>
<p><a href='` + sshEndpoint + `'>SSH Metrics</a></p>
<p><a href='` + metricsEndpoint + `'>Exporter Metrics</a></p>
</body>
</html>`))
})
http.Handle(sshEndpoint, metricsHandler(sc.C, logger))
http.Handle(metricsEndpoint, promhttp.Handler())
err := http.ListenAndServe(*listenAddress, nil)
if err != nil {
level.Error(logger).Log("err", err)
os.Exit(1)
}
}
func main() {
promlogConfig := &promlog.Config{}
flag.AddFlags(kingpin.CommandLine, promlogConfig)
kingpin.Version(version.Print("ssh_exporter"))
kingpin.HelpFlag.Short('h')
kingpin.Parse()
logger := promlog.New(promlogConfig)
run(logger)
}