package main import ( "bytes" "encoding/hex" "encoding/json" "flag" "fmt" "io/ioutil" "log" "math/rand" "os" "os/signal" "regexp" "syscall" "time" "golang.org/x/text/encoding/unicode" "github.com/kardianos/minwinsvc" "github.com/mitchellh/mapstructure" "github.com/neilalexander/hjson-go" "yggdrasil" "yggdrasil/config" "yggdrasil/defaults" ) type nodeConfig = config.NodeConfig type Core = yggdrasil.Core type node struct { core Core } // Generates default configuration. This is used when outputting the -genconf // parameter and also when using -autoconf. The isAutoconf flag is used to // determine whether the operating system should select a free port by itself // (which guarantees that there will not be a conflict with any other services) // or whether to generate a random port number. The only side effect of setting // isAutoconf is that the TCP and UDP ports will likely end up with different // port numbers. func generateConfig(isAutoconf bool) *nodeConfig { // Create a new core. core := Core{} // Generate encryption keys. bpub, bpriv := core.NewEncryptionKeys() spub, spriv := core.NewSigningKeys() // Create a node configuration and populate it. cfg := nodeConfig{} if isAutoconf { cfg.Listen = "[::]:0" } else { r1 := rand.New(rand.NewSource(time.Now().UnixNano())) cfg.Listen = fmt.Sprintf("[::]:%d", r1.Intn(65534-32768)+32768) } cfg.AdminListen = defaults.GetDefaults().DefaultAdminListen cfg.EncryptionPublicKey = hex.EncodeToString(bpub[:]) cfg.EncryptionPrivateKey = hex.EncodeToString(bpriv[:]) cfg.SigningPublicKey = hex.EncodeToString(spub[:]) cfg.SigningPrivateKey = hex.EncodeToString(spriv[:]) cfg.Peers = []string{} cfg.InterfacePeers = map[string][]string{} cfg.AllowedEncryptionPublicKeys = []string{} cfg.MulticastInterfaces = []string{".*"} cfg.IfName = defaults.GetDefaults().DefaultIfName cfg.IfMTU = defaults.GetDefaults().DefaultIfMTU cfg.IfTAPMode = defaults.GetDefaults().DefaultIfTAPMode cfg.SessionFirewall.Enable = false cfg.SessionFirewall.AllowFromDirect = true cfg.SessionFirewall.AllowFromRemote = true cfg.SwitchOptions.MaxTotalQueueSize = yggdrasil.SwitchQueueTotalMinSize return &cfg } // Generates a new configuration and returns it in HJSON format. This is used // with -genconf. func doGenconf() string { cfg := generateConfig(false) bs, err := hjson.Marshal(cfg) if err != nil { panic(err) } return string(bs) } // The main function is responsible for configuring and starting Yggdrasil. func main() { // Configure the command line parameters. genconf := flag.Bool("genconf", false, "print a new config to stdout") useconf := flag.Bool("useconf", false, "read config from stdin") useconffile := flag.String("useconffile", "", "read config from specified file path") normaliseconf := flag.Bool("normaliseconf", false, "use in combination with either -useconf or -useconffile, outputs your configuration normalised") autoconf := flag.Bool("autoconf", false, "automatic mode (dynamic IP, peer with IPv6 neighbors)") flag.Parse() var cfg *nodeConfig switch { case *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 = generateConfig(true) case *useconffile != "" || *useconf: // Use a configuration file. If -useconf, the configuration will be read // from stdin. If -useconffile, the configuration will be read from the // filesystem. var config []byte var err error if *useconffile != "" { // Read the file from the filesystem config, err = ioutil.ReadFile(*useconffile) } else { // Read the file from stdin. config, err = ioutil.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.Compare(config[0:2], []byte{0xFF, 0xFE}) == 0 || bytes.Compare(config[0:2], []byte{0xFE, 0xFF}) == 0 { utf := unicode.UTF16(unicode.BigEndian, unicode.UseBOM) decoder := utf.NewDecoder() config, err = decoder.Bytes(config) 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 = generateConfig(false) var dat map[string]interface{} if err := hjson.Unmarshal(config, &dat); err != nil { panic(err) } confJson, err := json.Marshal(dat) if err != nil { panic(err) } json.Unmarshal(confJson, &cfg) // For now we will do a little bit to help the user adjust their // configuration to match the new configuration format, as some of the key // names have changed recently. changes := map[string]string{ "Multicast": "", "LinkLocal": "MulticastInterfaces", "BoxPub": "EncryptionPublicKey", "BoxPriv": "EncryptionPrivateKey", "SigPub": "SigningPublicKey", "SigPriv": "SigningPrivateKey", "AllowedBoxPubs": "AllowedEncryptionPublicKeys", } // Loop over the mappings aove and see if we have anything to fix. for from, to := range changes { if _, ok := dat[from]; ok { if to == "" { if !*normaliseconf { log.Println("Warning: Deprecated config option", from, "- please remove") } } else { if !*normaliseconf { log.Println("Warning: Deprecated config option", from, "- please rename to", to) } // If the configuration file doesn't already contain a line with the // new name then set it to the old value. This makes sure that we // don't overwrite something that was put there intentionally. if _, ok := dat[to]; !ok { dat[to] = dat[from] } } } } // Overlay our newly mapped configuration onto the autoconf node config that // we generated above. if err = mapstructure.Decode(dat, &cfg); err != nil { panic(err) } // 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 *normaliseconf { bs, err := hjson.Marshal(cfg) if err != nil { panic(err) } fmt.Println(string(bs)) return } case *genconf: // Generate a new configuration and print it to stdout. fmt.Println(doGenconf()) 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 } // Create a new logger that logs output to stdout. logger := log.New(os.Stdout, "", log.Flags()) // Setup the Yggdrasil node itself. The node{} type includes a Core, so we // don't need to create this manually. n := node{} // Check to see if any multicast interface expressions were provided in the // config. If they were then set them now. for _, ll := range cfg.MulticastInterfaces { ifceExpr, err := regexp.Compile(ll) if err != nil { panic(err) } n.core.AddMulticastInterfaceExpr(ifceExpr) } // Now that we have a working configuration, we can now actually start // Yggdrasil. This will start the router, switch, DHT node, TCP and UDP // sockets, TUN/TAP adapter and multicast discovery port. if err := n.core.Start(cfg, logger); err != nil { logger.Println("An error occurred during startup") panic(err) } // Check to see if any allowed encryption keys were provided in the config. // If they were then set them now. for _, pBoxStr := range cfg.AllowedEncryptionPublicKeys { n.core.AddAllowedEncryptionPublicKey(pBoxStr) } // If any static peers were provided in the configuration above then we should // configure them. The loop ensures that disconnected peers will eventually // be reconnected with. go func() { if len(cfg.Peers) == 0 && len(cfg.InterfacePeers) == 0 { return } for { for _, peer := range cfg.Peers { n.core.AddPeer(peer, "") time.Sleep(time.Second) } for intf, intfpeers := range cfg.InterfacePeers { for _, peer := range intfpeers { n.core.AddPeer(peer, intf) time.Sleep(time.Second) } } time.Sleep(time.Minute) } }() // The Stop function ensures that the TUN/TAP adapter is correctly shut down // before the program exits. defer func() { n.core.Stop() }() // 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.GetAddress() subnet := n.core.GetSubnet() logger.Printf("Your IPv6 address is %s", address.String()) logger.Printf("Your IPv6 subnet is %s", subnet.String()) // Catch interrupts from the operating system to exit gracefully. c := make(chan os.Signal, 1) signal.Notify(c, os.Interrupt, syscall.SIGTERM) // Create a function to capture the service being stopped on Windows. winTerminate := func() { c <- os.Interrupt } minwinsvc.SetOnExit(winTerminate) // Wait for the terminate/interrupt signal. Once a signal is received, the // deferred Stop function above will run which will shut down TUN/TAP. <-c }