85 lines
3.1 KiB
Go
85 lines
3.1 KiB
Go
package cfg
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import (
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"fmt"
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"log"
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"os"
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"git.cryptic.systems/volker.raschek/prometheus-fail2ban-exporter/auth"
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"github.com/alecthomas/kong"
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)
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var cliStruct struct {
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VersionMode bool `name:"version" short:"v" help:"Show version info and exit"`
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DryRunMode bool `name:"dry-run" help:"Attempt to connect to the fail2ban socket then exit before starting the server"`
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ServerAddress string `name:"web.listen-address" env:"F2B_WEB_LISTEN_ADDRESS" help:"Address to use for the metrics server" default:"${default_address}"`
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F2bSocketPath string `name:"collector.f2b.socket" env:"F2B_COLLECTOR_SOCKET" help:"Path to the fail2ban server socket" default:"${default_socket}"`
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ExitOnSocketError bool `name:"collector.f2b.exit-on-socket-connection-error" env:"F2B_EXIT_ON_SOCKET_CONN_ERROR" help:"When set to true the exporter will immediately exit on a fail2ban socket connection error"`
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TextFileExporterPath string `name:"collector.textfile.directory" env:"F2B_COLLECTOR_TEXT_PATH" help:"Directory to read text files with metrics from"`
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BasicAuthUser string `name:"web.basic-auth.username" env:"F2B_WEB_BASICAUTH_USER" help:"Username to use to protect endpoints with basic auth"`
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BasicAuthPass string `name:"web.basic-auth.password" env:"F2B_WEB_BASICAUTH_PASS" help:"Password to use to protect endpoints with basic auth"`
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}
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func Parse() *AppSettings {
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ctx := kong.Parse(
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&cliStruct,
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kong.Vars{
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"default_socket": "/var/run/fail2ban/fail2ban.sock",
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"default_address": ":9191",
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},
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kong.Name("fail2ban_exporter"),
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kong.Description("🚀 Export prometheus metrics from a running Fail2Ban instance"),
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kong.UsageOnError(),
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)
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validateFlags(ctx)
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settings := &AppSettings{
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VersionMode: cliStruct.VersionMode,
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DryRunMode: cliStruct.DryRunMode,
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MetricsAddress: cliStruct.ServerAddress,
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Fail2BanSocketPath: cliStruct.F2bSocketPath,
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FileCollectorPath: cliStruct.TextFileExporterPath,
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ExitOnSocketConnError: cliStruct.ExitOnSocketError,
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AuthProvider: createAuthProvider(),
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}
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return settings
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}
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func createAuthProvider() auth.AuthProvider {
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username := cliStruct.BasicAuthUser
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password := cliStruct.BasicAuthPass
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if len(username) == 0 && len(password) == 0 {
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return auth.NewEmptyAuthProvider()
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}
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log.Print("basic auth enabled")
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return auth.NewBasicAuthProvider(username, password)
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}
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func validateFlags(cliCtx *kong.Context) {
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var flagsValid = true
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var messages = []string{}
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if !cliStruct.VersionMode {
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if cliStruct.F2bSocketPath == "" {
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messages = append(messages, "error: fail2ban socket path must not be blank")
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flagsValid = false
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}
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if cliStruct.ServerAddress == "" {
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messages = append(messages, "error: invalid server address, must not be blank")
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flagsValid = false
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}
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if (len(cliStruct.BasicAuthUser) > 0) != (len(cliStruct.BasicAuthPass) > 0) {
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messages = append(messages, "error: to enable basic auth both the username and the password must be provided")
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flagsValid = false
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}
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}
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if !flagsValid {
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cliCtx.PrintUsage(false)
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fmt.Println()
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for i := 0; i < len(messages); i++ {
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fmt.Println(messages[i])
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}
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os.Exit(1)
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}
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}
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