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main.go
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main.go
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package main
import (
"context"
"crypto/ed25519"
"encoding/hex"
"encoding/json"
"flag"
"fmt"
"net"
"os"
"os/signal"
"regexp"
"strings"
"syscall"
"github.com/gologme/log"
gsyslog "github.com/hashicorp/go-syslog"
"github.com/hjson/hjson-go/v4"
"github.com/kardianos/minwinsvc"
"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/ipv6rwc"
"github.com/yggdrasil-network/yggdrasil-go/src/core"
"github.com/yggdrasil-network/yggdrasil-go/src/multicast"
"github.com/yggdrasil-network/yggdrasil-go/src/tun"
"github.com/yggdrasil-network/yggdrasil-go/src/version"
)
type node struct {
core *core.Core
tun *tun.TunAdapter
multicast *multicast.Multicast
admin *admin.AdminSocket
}
// The main function is responsible for configuring and starting Yggdrasil.
func main() {
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")
exportkey := flag.Bool("exportkey", false, "use in combination with either -useconf or -useconffile, outputs your private key in PEM format")
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, "use in combination with either -useconf or -useconffile, outputs your IPv6 address")
getsnet := flag.Bool("subnet", false, "use in combination with either -useconf or -useconffile, outputs your IPv6 subnet")
getpkey := flag.Bool("publickey", false, "use in combination with either -useconf or -useconffile, outputs your public key")
loglevel := flag.String("loglevel", "info", "loglevel to enable")
flag.Parse()
// Catch interrupts from the operating system to exit gracefully.
ctx, cancel := signal.NotifyContext(context.Background(), os.Interrupt, syscall.SIGTERM)
// Capture the service being stopped on Windows.
minwinsvc.SetOnExit(cancel)
// Create a new logger that logs output to stdout.
var logger *log.Logger
switch *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()&^(log.Ldate|log.Ltime))
}
default:
if logfd, err := os.OpenFile(*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 *normaliseconf {
setLogLevel("error", logger)
} else {
setLogLevel(*loglevel, logger)
}
cfg := config.GenerateConfig()
var err error
switch {
case *ver:
fmt.Println("Build name:", version.BuildName())
fmt.Println("Build version:", version.BuildVersion())
return
case *autoconf:
// Use an autoconf-generated config, this will give us random keys and
// port numbers, and will use an automatically selected TUN interface.
case *useconf:
if _, err := cfg.ReadFrom(os.Stdin); err != nil {
panic(err)
}
case *useconffile != "":
f, err := os.Open(*useconffile)
if err != nil {
panic(err)
}
if _, err := cfg.ReadFrom(f); err != nil {
panic(err)
}
_ = f.Close()
case *genconf:
cfg.AdminListen = ""
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
default:
fmt.Println("Usage:")
flag.PrintDefaults()
if *getaddr || *getsnet {
fmt.Println("\nError: You need to specify some config data using -useconf or -useconffile.")
}
return
}
privateKey := ed25519.PrivateKey(cfg.PrivateKey)
publicKey := privateKey.Public().(ed25519.PublicKey)
switch {
case *getaddr:
addr := address.AddrForKey(publicKey)
ip := net.IP(addr[:])
fmt.Println(ip.String())
return
case *getsnet:
snet := address.SubnetForKey(publicKey)
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
case *getpkey:
fmt.Println(hex.EncodeToString(publicKey))
return
case *normaliseconf:
cfg.AdminListen = ""
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 *exportkey:
pem, err := cfg.MarshalPEMPrivateKey()
if err != nil {
panic(err)
}
fmt.Println(string(pem))
return
}
n := &node{}
// Setup the Yggdrasil node itself.
{
options := []core.SetupOption{
core.NodeInfo(cfg.NodeInfo),
core.NodeInfoPrivacy(cfg.NodeInfoPrivacy),
}
for _, addr := range cfg.Listen {
options = append(options, core.ListenAddress(addr))
}
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(cfg.Certificate, logger, options...); err != nil {
panic(err)
}
address, subnet := n.core.Address(), n.core.Subnet()
logger.Infof("Your public key is %s", hex.EncodeToString(n.core.PublicKey()))
logger.Infof("Your IPv6 address is %s", address.String())
logger.Infof("Your IPv6 subnet is %s", subnet.String())
}
// Setup the admin socket.
{
options := []admin.SetupOption{
admin.ListenAddress(cfg.AdminListen),
}
if cfg.LogLookups {
options = append(options, admin.LogLookups{})
}
if n.admin, err = admin.New(n.core, logger, options...); err != nil {
panic(err)
}
if n.admin != nil {
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,
Priority: uint8(intf.Priority),
Password: intf.Password,
})
}
if n.multicast, err = multicast.New(n.core, logger, options...); err != nil {
panic(err)
}
if n.admin != nil && n.multicast != nil {
n.multicast.SetupAdminHandlers(n.admin)
}
}
// Setup the TUN module.
{
options := []tun.SetupOption{
tun.InterfaceName(cfg.IfName),
tun.InterfaceMTU(cfg.IfMTU),
}
if n.tun, err = tun.New(ipv6rwc.NewReadWriteCloser(n.core), logger, options...); err != nil {
panic(err)
}
if n.admin != nil && n.tun != nil {
n.tun.SetupAdminHandlers(n.admin)
}
}
// Block until we are told to shut down.
<-ctx.Done()
// Shut down the node.
_ = n.admin.Stop()
_ = n.multicast.Stop()
_ = n.tun.Stop()
n.core.Stop()
}
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
}
}
}