package main import ( "bytes" "encoding/json" "flag" "fmt" "io/ioutil" "log" "os" "os/signal" "strings" "syscall" "golang.org/x/text/encoding/unicode" "github.com/hjson/hjson-go" "github.com/kardianos/minwinsvc" "github.com/mitchellh/mapstructure" "github.com/yggdrasil-network/yggdrasil-go/src/config" "github.com/yggdrasil-network/yggdrasil-go/src/yggdrasil" ) type nodeConfig = config.NodeConfig type Core = yggdrasil.Core type node struct { core Core } func readConfig(useconf *bool, useconffile *string, normaliseconf *bool) *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 = ioutil.ReadFile(*useconffile) } else { // Read the file from stdin. conf, 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(conf[0:2], []byte{0xFF, 0xFE}) == 0 || bytes.Compare(conf[0:2], []byte{0xFE, 0xFF}) == 0 { 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 := config.GenerateConfig(false) var dat map[string]interface{} if err := hjson.Unmarshal(conf, &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] } } } } // Check to see if the peers are in a parsable format, if not then default // them to the TCP scheme if peers, ok := dat["Peers"].([]interface{}); ok { for index, peer := range peers { uri := peer.(string) if strings.HasPrefix(uri, "tcp://") || strings.HasPrefix(uri, "socks://") { continue } if strings.HasPrefix(uri, "tcp:") { uri = uri[4:] } (dat["Peers"].([]interface{}))[index] = "tcp://" + uri } } // Now do the same with the interface peers if interfacepeers, ok := dat["InterfacePeers"].(map[string]interface{}); ok { for intf, peers := range interfacepeers { for index, peer := range peers.([]interface{}) { uri := peer.(string) if strings.HasPrefix(uri, "tcp://") || strings.HasPrefix(uri, "socks://") { continue } if strings.HasPrefix(uri, "tcp:") { uri = uri[4:] } ((dat["InterfacePeers"].(map[string]interface{}))[intf]).([]interface{})[index] = "tcp://" + uri } } } // 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 := config.GenerateConfig(false) 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) } // 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 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)") version := flag.Bool("version", false, "prints the version of this build") flag.Parse() var cfg *nodeConfig var err error switch { case *version: fmt.Println("Build name:", yggdrasil.GetBuildName()) fmt.Println("Build version:", yggdrasil.GetBuildVersion()) os.Exit(0) 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 = config.GenerateConfig(true) case *useconffile != "" || *useconf: // Read the configuration from either stdin or from the filesystem cfg = readConfig(useconf, useconffile, 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 *normaliseconf { var bs []byte if *confjson { bs, err = json.MarshalIndent(cfg, "", " ") } else { 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(*confjson)) 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{} // 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) } // 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) r := make(chan os.Signal, 1) signal.Notify(c, os.Interrupt, syscall.SIGTERM) signal.Notify(r, os.Interrupt, syscall.SIGHUP) // 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. for { select { case _ = <-r: if *useconffile != "" { cfg = readConfig(useconf, useconffile, normaliseconf) n.core.UpdateConfig(cfg) } else { logger.Println("Reloading config at runtime is only possible with -useconffile") } case _ = <-c: goto exit } } exit: }