package main import ( "bytes" "context" "crypto/ed25519" "encoding/hex" "encoding/json" "flag" "fmt" "io" "net" "os" "os/signal" "regexp" "strings" "syscall" "golang.org/x/text/encoding/unicode" "github.com/gologme/log" gsyslog "github.com/hashicorp/go-syslog" "github.com/hjson/hjson-go" "github.com/kardianos/minwinsvc" "github.com/mitchellh/mapstructure" "github.com/yggdrasil-network/yggdrasil-go/src/address" "github.com/yggdrasil-network/yggdrasil-go/src/admin" "github.com/yggdrasil-network/yggdrasil-go/src/config" "github.com/yggdrasil-network/yggdrasil-go/src/defaults" "github.com/yggdrasil-network/yggdrasil-go/src/core" "github.com/yggdrasil-network/yggdrasil-go/src/ipv6rwc" "github.com/yggdrasil-network/yggdrasil-go/src/multicast" "github.com/yggdrasil-network/yggdrasil-go/src/tuntap" "github.com/yggdrasil-network/yggdrasil-go/src/version" ) type node struct { core *core.Core tuntap *tuntap.TunAdapter multicast *multicast.Multicast admin *admin.AdminSocket } func readConfig(log *log.Logger, useconf bool, useconffile string, normaliseconf bool) *config.NodeConfig { // Use a configuration file. If -useconf, the configuration will be read // from stdin. If -useconffile, the configuration will be read from the // filesystem. var conf []byte var err error if useconffile != "" { // Read the file from the filesystem conf, err = os.ReadFile(useconffile) } else { // Read the file from stdin. conf, err = io.ReadAll(os.Stdin) } if err != nil { panic(err) } // If there's a byte order mark - which Windows 10 is now incredibly fond of // throwing everywhere when it's converting things into UTF-16 for the hell // of it - remove it and decode back down into UTF-8. This is necessary // because hjson doesn't know what to do with UTF-16 and will panic if bytes.Equal(conf[0:2], []byte{0xFF, 0xFE}) || bytes.Equal(conf[0:2], []byte{0xFE, 0xFF}) { utf := unicode.UTF16(unicode.BigEndian, unicode.UseBOM) decoder := utf.NewDecoder() conf, err = decoder.Bytes(conf) if err != nil { panic(err) } } // Generate a new configuration - this gives us a set of sane defaults - // then parse the configuration we loaded above on top of it. The effect // of this is that any configuration item that is missing from the provided // configuration will use a sane default. cfg := defaults.GenerateConfig() var dat map[string]interface{} if err := hjson.Unmarshal(conf, &dat); err != nil { panic(err) } // Sanitise the config confJson, err := json.Marshal(dat) if err != nil { panic(err) } if err := json.Unmarshal(confJson, &cfg); err != nil { panic(err) } // Overlay our newly mapped configuration onto the autoconf node config that // we generated above. if err = mapstructure.Decode(dat, &cfg); err != nil { panic(err) } return cfg } // Generates a new configuration and returns it in HJSON format. This is used // with -genconf. func doGenconf(isjson bool) string { cfg := defaults.GenerateConfig() var bs []byte var err error if isjson { bs, err = json.MarshalIndent(cfg, "", " ") } else { bs, err = hjson.Marshal(cfg) } if err != nil { panic(err) } return string(bs) } func setLogLevel(loglevel string, logger *log.Logger) { levels := [...]string{"error", "warn", "info", "debug", "trace"} loglevel = strings.ToLower(loglevel) contains := func() bool { for _, l := range levels { if l == loglevel { return true } } return false } if !contains() { // set default log level logger.Infoln("Loglevel parse failed. Set default level(info)") loglevel = "info" } for _, l := range levels { logger.EnableLevel(l) if l == loglevel { break } } } type yggArgs struct { genconf bool useconf bool normaliseconf bool confjson bool autoconf bool ver bool getaddr bool getsnet bool useconffile string logto string loglevel string } func getArgs() yggArgs { genconf := flag.Bool("genconf", false, "print a new config to stdout") useconf := flag.Bool("useconf", false, "read HJSON/JSON config from stdin") useconffile := flag.String("useconffile", "", "read HJSON/JSON config from specified file path") normaliseconf := flag.Bool("normaliseconf", false, "use in combination with either -useconf or -useconffile, outputs your configuration normalised") confjson := flag.Bool("json", false, "print configuration from -genconf or -normaliseconf as JSON instead of HJSON") autoconf := flag.Bool("autoconf", false, "automatic mode (dynamic IP, peer with IPv6 neighbors)") ver := flag.Bool("version", false, "prints the version of this build") logto := flag.String("logto", "stdout", "file path to log to, \"syslog\" or \"stdout\"") getaddr := flag.Bool("address", false, "returns the IPv6 address as derived from the supplied configuration") getsnet := flag.Bool("subnet", false, "returns the IPv6 subnet as derived from the supplied configuration") loglevel := flag.String("loglevel", "info", "loglevel to enable") flag.Parse() return yggArgs{ genconf: *genconf, useconf: *useconf, useconffile: *useconffile, normaliseconf: *normaliseconf, confjson: *confjson, autoconf: *autoconf, ver: *ver, logto: *logto, getaddr: *getaddr, getsnet: *getsnet, loglevel: *loglevel, } } // The main function is responsible for configuring and starting Yggdrasil. func run(args yggArgs, ctx context.Context, done chan struct{}) { defer close(done) // Create a new logger that logs output to stdout. var logger *log.Logger switch args.logto { case "stdout": logger = log.New(os.Stdout, "", log.Flags()) case "syslog": if syslogger, err := gsyslog.NewLogger(gsyslog.LOG_NOTICE, "DAEMON", version.BuildName()); err == nil { logger = log.New(syslogger, "", log.Flags()) } default: if logfd, err := os.OpenFile(args.logto, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644); err == nil { logger = log.New(logfd, "", log.Flags()) } } if logger == nil { logger = log.New(os.Stdout, "", log.Flags()) logger.Warnln("Logging defaulting to stdout") } if args.normaliseconf { setLogLevel("error", logger) } else { setLogLevel(args.loglevel, logger) } var cfg *config.NodeConfig var err error switch { case args.ver: fmt.Println("Build name:", version.BuildName()) fmt.Println("Build version:", version.BuildVersion()) return case args.autoconf: // Use an autoconf-generated config, this will give us random keys and // port numbers, and will use an automatically selected TUN/TAP interface. cfg = defaults.GenerateConfig() case args.useconffile != "" || args.useconf: // Read the configuration from either stdin or from the filesystem cfg = readConfig(logger, args.useconf, args.useconffile, args.normaliseconf) // If the -normaliseconf option was specified then remarshal the above // configuration and print it back to stdout. This lets the user update // their configuration file with newly mapped names (like above) or to // convert from plain JSON to commented HJSON. if args.normaliseconf { var bs []byte if args.confjson { bs, err = json.MarshalIndent(cfg, "", " ") } else { bs, err = hjson.Marshal(cfg) } if err != nil { panic(err) } fmt.Println(string(bs)) return } case args.genconf: // Generate a new configuration and print it to stdout. fmt.Println(doGenconf(args.confjson)) return default: // No flags were provided, therefore print the list of flags to stdout. flag.PrintDefaults() } // Have we got a working configuration? If we don't then it probably means // that neither -autoconf, -useconf or -useconffile were set above. Stop // if we don't. if cfg == nil { return } // Have we been asked for the node address yet? If so, print it and then stop. getNodeKey := func() ed25519.PublicKey { if pubkey, err := hex.DecodeString(cfg.PrivateKey); err == nil { return ed25519.PrivateKey(pubkey).Public().(ed25519.PublicKey) } return nil } switch { case args.getaddr: if key := getNodeKey(); key != nil { addr := address.AddrForKey(key) ip := net.IP(addr[:]) fmt.Println(ip.String()) } return case args.getsnet: if key := getNodeKey(); key != nil { snet := address.SubnetForKey(key) ipnet := net.IPNet{ IP: append(snet[:], 0, 0, 0, 0, 0, 0, 0, 0), Mask: net.CIDRMask(len(snet)*8, 128), } fmt.Println(ipnet.String()) } return } n := &node{} // Setup the Yggdrasil node itself. { sk, err := hex.DecodeString(cfg.PrivateKey) if err != nil { panic(err) } options := []core.SetupOption{ core.IfName(cfg.IfName), core.IfMTU(cfg.IfMTU), } for _, peer := range cfg.Peers { options = append(options, core.Peer{URI: peer}) } for intf, peers := range cfg.InterfacePeers { for _, peer := range peers { options = append(options, core.Peer{URI: peer, SourceInterface: intf}) } } for _, allowed := range cfg.AllowedPublicKeys { k, err := hex.DecodeString(allowed) if err != nil { panic(err) } options = append(options, core.AllowedPublicKey(k[:])) } if n.core, err = core.New(sk[:], logger, options...); err != nil { panic(err) } } // Setup the admin socket. { options := []admin.SetupOption{ admin.ListenAddress(cfg.AdminListen), } if n.admin, err = admin.New(n.core, logger, options...); err != nil { panic(err) } n.admin.SetupAdminHandlers() } // Setup the multicast module. { options := []multicast.SetupOption{} for _, intf := range cfg.MulticastInterfaces { options = append(options, multicast.MulticastInterface{ Regex: regexp.MustCompile(intf.Regex), Beacon: intf.Beacon, Listen: intf.Listen, Port: intf.Port, }) } if n.multicast, err = multicast.New(n.core, logger, options...); err != nil { panic(err) } if n.admin != nil { n.multicast.SetupAdminHandlers(n.admin) } } // Setup the TUN module. { options := []tuntap.SetupOption{ tuntap.InterfaceName(cfg.IfName), tuntap.InterfaceMTU(cfg.IfMTU), } if n.tuntap, err = tuntap.New(ipv6rwc.NewReadWriteCloser(n.core), logger, options...); err != nil { panic(err) } if n.admin != nil { n.tuntap.SetupAdminHandlers(n.admin) } } // Make some nice output that tells us what our IPv6 address and subnet are. // This is just logged to stdout for the user. address := n.core.Address() subnet := n.core.Subnet() public := n.core.GetSelf().Key logger.Infof("Your public key is %s", hex.EncodeToString(public[:])) logger.Infof("Your IPv6 address is %s", address.String()) logger.Infof("Your IPv6 subnet is %s", subnet.String()) // Catch interrupts from the operating system to exit gracefully. <-ctx.Done() // Capture the service being stopped on Windows. minwinsvc.SetOnExit(n.shutdown) n.shutdown() } func (n *node) shutdown() { _ = n.admin.Stop() _ = n.multicast.Stop() _ = n.tuntap.Stop() n.core.Stop() } func main() { args := getArgs() hup := make(chan os.Signal, 1) //signal.Notify(hup, os.Interrupt, syscall.SIGHUP) term := make(chan os.Signal, 1) signal.Notify(term, os.Interrupt, syscall.SIGTERM) for { done := make(chan struct{}) ctx, cancel := context.WithCancel(context.Background()) go run(args, ctx, done) select { case <-hup: cancel() <-done case <-term: cancel() <-done return case <-done: return } } }