167 lines
4.4 KiB
Go
167 lines
4.4 KiB
Go
package main
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import (
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"context"
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"crypto/tls"
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"errors"
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"flag"
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"fmt"
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"log"
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"os"
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"os/signal"
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"path/filepath"
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"syscall"
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"time"
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"github.com/n0x1m/gmifs/fileserver"
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"github.com/n0x1m/gmifs/gemini"
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"github.com/n0x1m/gmifs/middleware"
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)
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const (
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defaultAddress = ":1965"
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defaultMaxConns = 256
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defaultTimeout = 10
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defaultRootPath = "/var/www/htdocs/gemini"
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defaultHost = ""
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defaultCertPath = ""
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defaultKeyPath = ""
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autoCertDaysValid = 7
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shutdownTimeout = 10 * time.Second
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)
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func main() {
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var addr, root, crt, key, host, logs string
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var maxconns, timeout int
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var debug, autoindex bool
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flag.StringVar(&addr, "addr", defaultAddress, "address to listen on. E.g. 127.0.0.1:1965")
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flag.IntVar(&maxconns, "max-conns", defaultMaxConns, "maximum number of concurrently open connections")
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flag.IntVar(&timeout, "timeout", defaultTimeout, "connection timeout in seconds")
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flag.StringVar(&root, "root", defaultRootPath, "server root directory to serve from")
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flag.StringVar(&host, "host", defaultHost, "hostname / x509 Common Name when using temporary self-signed certs")
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flag.StringVar(&crt, "cert", defaultCertPath, "TLS chain of one or more certificates")
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flag.StringVar(&key, "key", defaultKeyPath, "TLS private key")
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flag.StringVar(&logs, "logs", "", "directory for file based logging")
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flag.BoolVar(&debug, "debug", false, "enable verbose logging of the gemini server")
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flag.BoolVar(&autoindex, "autoindex", false, "enables or disables the directory listing output")
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flag.Parse()
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var err error
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var flogger, dlogger *log.Logger
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flogger, err = setupLogger(logs, "access.log")
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if err != nil {
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log.Fatal(err)
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}
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if debug {
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dlogger, err = setupLogger(logs, "debug.log")
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if err != nil {
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log.Fatal(err)
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}
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}
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if host == "" {
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fmt.Fprintf(os.Stderr, "a keypair with cert and key or at least a common name (hostname) is required for sni\n")
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fmt.Fprintf(os.Stderr, "Usage of %s:\n", os.Args[0])
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flag.PrintDefaults()
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os.Exit(1)
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}
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mux := gemini.NewMux()
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mux.Use(middleware.Logger(flogger))
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mux.Handle(gemini.HandlerFunc(fileserver.Serve(root, autoindex)))
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server := &gemini.Server{
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Addr: addr,
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Hostname: host,
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TLSConfigLoader: setupCertificate(crt, key, host),
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Handler: mux,
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MaxOpenConns: maxconns,
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ReadTimeout: time.Duration(timeout) * time.Second,
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Logger: dlogger,
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}
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confirm := make(chan struct{}, 1)
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go func() {
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if err := server.ListenAndServe(); err != nil && !errors.Is(err, gemini.ErrServerClosed) {
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log.Fatalf("ListenAndServe terminated unexpectedly: %v", err)
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}
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close(confirm)
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}()
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stop := make(chan os.Signal, 1)
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signal.Notify(stop, os.Interrupt)
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<-stop
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ctx, cancel := context.WithTimeout(context.Background(), shutdownTimeout)
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if err := server.Shutdown(ctx); err != nil {
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cancel()
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log.Fatalf("ListenAndServe shutdown with error: %v", err)
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}
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<-confirm
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cancel()
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}
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func setupCertificate(crt, key, host string) func() (*tls.Config, error) {
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return func() (*tls.Config, error) {
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if crt != "" && key != "" {
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cert, err := tls.LoadX509KeyPair(crt, key)
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if err != nil {
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return nil, fmt.Errorf("load x509 keypair: %w", err)
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}
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return gemini.TLSConfig(host, cert), nil
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}
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log.Println("generating self-signed temporary certificate")
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cert, err := gemini.GenX509KeyPair(host, autoCertDaysValid)
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if err != nil {
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return nil, fmt.Errorf("generate x509 keypair: %w", err)
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}
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return gemini.TLSConfig(host, cert), nil
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}
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}
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func setupLogger(dir, filename string) (*log.Logger, error) {
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logger := log.New(os.Stdout, "", log.LUTC|log.Ldate|log.Ltime)
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if dir != "" {
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// non 12factor stuff
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logpath := filepath.Join(dir, filename)
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_, err := setupFileLogging(logger, logpath)
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if err != nil {
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return logger, fmt.Errorf("setup logger: %w", err)
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}
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go func(logger *log.Logger, logpath string) {
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hup := make(chan os.Signal, 1)
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signal.Notify(hup, syscall.SIGHUP)
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for {
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<-hup
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logger.Println("rotating log file after SIGHUP")
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_, err := setupFileLogging(logger, logpath)
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if err != nil {
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log.Fatalf("failed to rotate log file: %v", err)
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}
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}
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}(logger, logpath)
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}
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return logger, nil
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}
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func setupFileLogging(logger *log.Logger, logpath string) (*os.File, error) {
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logfile, err := os.OpenFile(logpath, os.O_WRONLY|os.O_CREATE|os.O_APPEND, 0644)
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if err != nil {
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return logfile, fmt.Errorf("log file open: %w", err)
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}
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logger.SetOutput(logfile)
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return logfile, nil
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}
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