mirror of
https://github.com/cwinfo/yggdrasil-go.git
synced 2024-11-14 04:30:32 +00:00
282 lines
9.3 KiB
Go
282 lines
9.3 KiB
Go
package main
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import (
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"bytes"
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"encoding/json"
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"flag"
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"fmt"
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"io/ioutil"
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"log"
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"os"
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"os/signal"
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"regexp"
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"strings"
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"syscall"
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"time"
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"golang.org/x/text/encoding/unicode"
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"github.com/hjson/hjson-go"
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"github.com/kardianos/minwinsvc"
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"github.com/mitchellh/mapstructure"
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"github.com/yggdrasil-network/yggdrasil-go/src/config"
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"github.com/yggdrasil-network/yggdrasil-go/src/yggdrasil"
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)
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type nodeConfig = config.NodeConfig
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type Core = yggdrasil.Core
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type node struct {
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core Core
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}
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// Generates a new configuration and returns it in HJSON format. This is used
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// with -genconf.
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func doGenconf(isjson bool) string {
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cfg := config.GenerateConfig(false)
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var bs []byte
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var err error
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if isjson {
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bs, err = json.MarshalIndent(cfg, "", " ")
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} else {
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bs, err = hjson.Marshal(cfg)
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}
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if err != nil {
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panic(err)
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}
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return string(bs)
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}
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// The main function is responsible for configuring and starting Yggdrasil.
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func main() {
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// Configure the command line parameters.
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genconf := flag.Bool("genconf", false, "print a new config to stdout")
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useconf := flag.Bool("useconf", false, "read HJSON/JSON config from stdin")
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useconffile := flag.String("useconffile", "", "read HJSON/JSON config from specified file path")
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normaliseconf := flag.Bool("normaliseconf", false, "use in combination with either -useconf or -useconffile, outputs your configuration normalised")
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confjson := flag.Bool("json", false, "print configuration from -genconf or -normaliseconf as JSON instead of HJSON")
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autoconf := flag.Bool("autoconf", false, "automatic mode (dynamic IP, peer with IPv6 neighbors)")
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version := flag.Bool("version", false, "prints the version of this build")
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flag.Parse()
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var cfg *nodeConfig
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switch {
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case *version:
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fmt.Println("Build name:", yggdrasil.GetBuildName())
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fmt.Println("Build version:", yggdrasil.GetBuildVersion())
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os.Exit(0)
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case *autoconf:
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// Use an autoconf-generated config, this will give us random keys and
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// port numbers, and will use an automatically selected TUN/TAP interface.
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cfg = config.GenerateConfig(true)
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case *useconffile != "" || *useconf:
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// Use a configuration file. If -useconf, the configuration will be read
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// from stdin. If -useconffile, the configuration will be read from the
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// filesystem.
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var configjson []byte
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var err error
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if *useconffile != "" {
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// Read the file from the filesystem
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configjson, err = ioutil.ReadFile(*useconffile)
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} else {
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// Read the file from stdin.
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configjson, err = ioutil.ReadAll(os.Stdin)
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}
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if err != nil {
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panic(err)
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}
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// If there's a byte order mark - which Windows 10 is now incredibly fond of
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// throwing everywhere when it's converting things into UTF-16 for the hell
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// of it - remove it and decode back down into UTF-8. This is necessary
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// because hjson doesn't know what to do with UTF-16 and will panic
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if bytes.Compare(configjson[0:2], []byte{0xFF, 0xFE}) == 0 ||
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bytes.Compare(configjson[0:2], []byte{0xFE, 0xFF}) == 0 {
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utf := unicode.UTF16(unicode.BigEndian, unicode.UseBOM)
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decoder := utf.NewDecoder()
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configjson, err = decoder.Bytes(configjson)
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if err != nil {
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panic(err)
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}
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}
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// Generate a new configuration - this gives us a set of sane defaults -
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// then parse the configuration we loaded above on top of it. The effect
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// of this is that any configuration item that is missing from the provided
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// configuration will use a sane default.
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cfg = config.GenerateConfig(false)
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var dat map[string]interface{}
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if err := hjson.Unmarshal(configjson, &dat); err != nil {
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panic(err)
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}
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confJson, err := json.Marshal(dat)
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if err != nil {
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panic(err)
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}
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json.Unmarshal(confJson, &cfg)
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// For now we will do a little bit to help the user adjust their
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// configuration to match the new configuration format, as some of the key
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// names have changed recently.
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changes := map[string]string{
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"Multicast": "",
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"LinkLocal": "MulticastInterfaces",
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"BoxPub": "EncryptionPublicKey",
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"BoxPriv": "EncryptionPrivateKey",
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"SigPub": "SigningPublicKey",
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"SigPriv": "SigningPrivateKey",
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"AllowedBoxPubs": "AllowedEncryptionPublicKeys",
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}
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// Loop over the mappings aove and see if we have anything to fix.
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for from, to := range changes {
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if _, ok := dat[from]; ok {
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if to == "" {
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if !*normaliseconf {
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log.Println("Warning: Deprecated config option", from, "- please remove")
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}
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} else {
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if !*normaliseconf {
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log.Println("Warning: Deprecated config option", from, "- please rename to", to)
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}
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// If the configuration file doesn't already contain a line with the
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// new name then set it to the old value. This makes sure that we
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// don't overwrite something that was put there intentionally.
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if _, ok := dat[to]; !ok {
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dat[to] = dat[from]
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}
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}
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}
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}
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// Check to see if the peers are in a parsable format, if not then default
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// them to the TCP scheme
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if peers, ok := dat["Peers"].([]interface{}); ok {
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for index, peer := range peers {
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uri := peer.(string)
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if strings.HasPrefix(uri, "tcp://") || strings.HasPrefix(uri, "socks://") {
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continue
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}
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if strings.HasPrefix(uri, "tcp:") {
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uri = uri[4:]
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}
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(dat["Peers"].([]interface{}))[index] = "tcp://" + uri
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}
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}
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// Now do the same with the interface peers
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if interfacepeers, ok := dat["InterfacePeers"].(map[string]interface{}); ok {
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for intf, peers := range interfacepeers {
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for index, peer := range peers.([]interface{}) {
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uri := peer.(string)
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if strings.HasPrefix(uri, "tcp://") || strings.HasPrefix(uri, "socks://") {
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continue
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}
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if strings.HasPrefix(uri, "tcp:") {
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uri = uri[4:]
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}
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((dat["InterfacePeers"].(map[string]interface{}))[intf]).([]interface{})[index] = "tcp://" + uri
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}
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}
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}
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// Overlay our newly mapped configuration onto the autoconf node config that
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// we generated above.
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if err = mapstructure.Decode(dat, &cfg); err != nil {
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panic(err)
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}
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// If the -normaliseconf option was specified then remarshal the above
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// configuration and print it back to stdout. This lets the user update
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// their configuration file with newly mapped names (like above) or to
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// convert from plain JSON to commented HJSON.
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if *normaliseconf {
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var bs []byte
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if *confjson {
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bs, err = json.MarshalIndent(cfg, "", " ")
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} else {
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bs, err = hjson.Marshal(cfg)
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}
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if err != nil {
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panic(err)
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}
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fmt.Println(string(bs))
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return
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}
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case *genconf:
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// Generate a new configuration and print it to stdout.
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fmt.Println(doGenconf(*confjson))
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default:
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// No flags were provided, therefore print the list of flags to stdout.
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flag.PrintDefaults()
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}
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// Have we got a working configuration? If we don't then it probably means
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// that neither -autoconf, -useconf or -useconffile were set above. Stop
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// if we don't.
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if cfg == nil {
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return
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}
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// Create a new logger that logs output to stdout.
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logger := log.New(os.Stdout, "", log.Flags())
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// Setup the Yggdrasil node itself. The node{} type includes a Core, so we
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// don't need to create this manually.
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n := node{}
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// Check to see if any multicast interface expressions were provided in the
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// config. If they were then set them now.
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for _, ll := range cfg.MulticastInterfaces {
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ifceExpr, err := regexp.Compile(ll)
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if err != nil {
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panic(err)
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}
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n.core.AddMulticastInterfaceExpr(ifceExpr)
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}
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// Now that we have a working configuration, we can now actually start
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// Yggdrasil. This will start the router, switch, DHT node, TCP and UDP
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// sockets, TUN/TAP adapter and multicast discovery port.
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if err := n.core.Start(cfg, logger); err != nil {
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logger.Println("An error occurred during startup")
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panic(err)
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}
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// Check to see if any allowed encryption keys were provided in the config.
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// If they were then set them now.
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for _, pBoxStr := range cfg.AllowedEncryptionPublicKeys {
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n.core.AddAllowedEncryptionPublicKey(pBoxStr)
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}
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// If any static peers were provided in the configuration above then we should
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// configure them. The loop ensures that disconnected peers will eventually
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// be reconnected with.
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go func() {
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if len(cfg.Peers) == 0 && len(cfg.InterfacePeers) == 0 {
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return
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}
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for {
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for _, peer := range cfg.Peers {
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n.core.AddPeer(peer, "")
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time.Sleep(time.Second)
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}
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for intf, intfpeers := range cfg.InterfacePeers {
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for _, peer := range intfpeers {
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n.core.AddPeer(peer, intf)
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time.Sleep(time.Second)
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}
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}
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time.Sleep(time.Minute)
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}
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}()
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// The Stop function ensures that the TUN/TAP adapter is correctly shut down
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// before the program exits.
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defer func() {
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n.core.Stop()
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}()
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// Make some nice output that tells us what our IPv6 address and subnet are.
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// This is just logged to stdout for the user.
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address := n.core.GetAddress()
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subnet := n.core.GetSubnet()
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logger.Printf("Your IPv6 address is %s", address.String())
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logger.Printf("Your IPv6 subnet is %s", subnet.String())
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// Catch interrupts from the operating system to exit gracefully.
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c := make(chan os.Signal, 1)
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signal.Notify(c, os.Interrupt, syscall.SIGTERM)
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// Create a function to capture the service being stopped on Windows.
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winTerminate := func() {
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c <- os.Interrupt
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}
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minwinsvc.SetOnExit(winTerminate)
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// Wait for the terminate/interrupt signal. Once a signal is received, the
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// deferred Stop function above will run which will shut down TUN/TAP.
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<-c
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}
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