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main.go
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main.go
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// SPDX-FileCopyrightText: (c) Mauve Mailorder Software GmbH & Co. KG, 2020. Licensed under [Apache 2.0](LICENSE) license.
//
// SPDX-License-Identifier: MIT
package main
import (
"flag"
"fmt"
"net/http"
"os"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promhttp"
"github.com/sirupsen/logrus"
)
const version string = "0.1.0"
var (
showVersion = flag.Bool("version", false, "Print version information.")
listenAddress = flag.String("web.listen-address", ":9730", "Address on which to expose metrics and web interface.")
metricsPath = flag.String("web.telemetry-path", "/metrics", "Path under which to expose metrics.")
configFile = flag.String("config.path", "config.yml", "Path to config file")
tlsEnabled = flag.Bool("tls.enabled", false, "Enables TLS")
tlsCertChainPath = flag.String("tls.cert-file", "", "Path to TLS cert file")
tlsKeyPath = flag.String("tls.key-file", "", "Path to TLS key file")
cfg *Config
)
func main() {
flag.Parse()
if *showVersion {
printVersion()
os.Exit(0)
}
startServer()
}
func printVersion() {
fmt.Println("lynis_exporter")
fmt.Printf("Version: %s\n", version)
fmt.Println("Author(s): Daniel Czerwonk")
fmt.Println("Copyright: 2020, Mauve Mailorder Software GmbH & Co. KG, Licensed under Apache 2.0")
fmt.Println("Metric exporter for Lynis audit results")
}
func startServer() {
logrus.Infof("Starting Lynis exporter (Version: %s)", version)
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
w.Write([]byte(`<html>
<head><title>Lynis Exporter (Version ` + version + `)</title></head>
<body>
<h1>Lynis Exporter by Mauve Mailorder Software</h1>
<h2>Metrics</h2>
<p><a href="/metrics">here</a></p>
<h2>More information</h2>
<p><a href="https://github.com/MauveSoftware/lynis_exporter">github.com/MauveSoftware/lynis_exporter</a></p>
</body>
</html>`))
})
var err error
cfg, err = loadConfigFromFile(*configFile)
if err != nil {
logrus.Fatal(err)
}
http.HandleFunc(*metricsPath, errorHandler(handleMetricsRequest))
logrus.Infof("Listening for %s on %s (TLS: %v)", *metricsPath, *listenAddress, *tlsEnabled)
if *tlsEnabled {
logrus.Fatal(http.ListenAndServeTLS(*listenAddress, *tlsCertChainPath, *tlsKeyPath, nil))
return
}
logrus.Fatal(http.ListenAndServe(*listenAddress, nil))
}
func errorHandler(f func(http.ResponseWriter, *http.Request) error) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
err := f(w, r)
if err != nil {
logrus.Errorln(err)
http.Error(w, err.Error(), http.StatusInternalServerError)
}
}
}
func handleMetricsRequest(w http.ResponseWriter, r *http.Request) error {
reg := prometheus.NewRegistry()
c := newCollector(cfg)
err := c.collect()
if err != nil {
return err
}
reg.MustRegister(c)
l := logrus.New()
l.Level = logrus.ErrorLevel
promhttp.HandlerFor(reg, promhttp.HandlerOpts{
ErrorLog: l,
ErrorHandling: promhttp.ContinueOnError}).ServeHTTP(w, r)
return nil
}