mirror of
https://github.com/yggdrasil-network/yggdrasil-go.git
synced 2024-12-25 17:27:46 +00:00
337 lines
10 KiB
Go
337 lines
10 KiB
Go
package main
|
|
|
|
import (
|
|
"bytes"
|
|
"encoding/hex"
|
|
"encoding/json"
|
|
"flag"
|
|
"fmt"
|
|
"io/ioutil"
|
|
"os"
|
|
"os/signal"
|
|
"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/admin"
|
|
"github.com/yggdrasil-network/yggdrasil-go/src/config"
|
|
"github.com/yggdrasil-network/yggdrasil-go/src/crypto"
|
|
"github.com/yggdrasil-network/yggdrasil-go/src/multicast"
|
|
"github.com/yggdrasil-network/yggdrasil-go/src/tuntap"
|
|
"github.com/yggdrasil-network/yggdrasil-go/src/yggdrasil"
|
|
)
|
|
|
|
type node struct {
|
|
core yggdrasil.Core
|
|
state *config.NodeState
|
|
tuntap tuntap.TunAdapter
|
|
multicast multicast.Multicast
|
|
admin admin.AdminSocket
|
|
}
|
|
|
|
func readConfig(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 = 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()
|
|
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)
|
|
// 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()
|
|
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")
|
|
logging := flag.String("logging", "info,warn,error", "comma-separated list of logging levels to enable")
|
|
logto := flag.String("logto", "stdout", "file path to log to, \"syslog\" or \"stdout\"")
|
|
flag.Parse()
|
|
|
|
var cfg *config.NodeConfig
|
|
var err error
|
|
switch {
|
|
case *version:
|
|
fmt.Println("Build name:", yggdrasil.BuildName())
|
|
fmt.Println("Build version:", yggdrasil.BuildVersion())
|
|
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()
|
|
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.
|
|
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", yggdrasil.BuildName()); err == nil {
|
|
logger = log.New(syslogger, "", log.Flags())
|
|
}
|
|
default:
|
|
if logfd, err := os.Create(*logto); err == nil {
|
|
logger = log.New(logfd, "", log.Flags())
|
|
}
|
|
}
|
|
if logger == nil {
|
|
logger = log.New(os.Stdout, "", log.Flags())
|
|
logger.Warnln("Logging defaulting to stdout")
|
|
}
|
|
//logger.EnableLevel("error")
|
|
//logger.EnableLevel("warn")
|
|
//logger.EnableLevel("info")
|
|
if levels := strings.Split(*logging, ","); len(levels) > 0 {
|
|
for _, level := range levels {
|
|
l := strings.TrimSpace(level)
|
|
switch l {
|
|
case "error", "warn", "info", "trace", "debug":
|
|
logger.EnableLevel(l)
|
|
default:
|
|
continue
|
|
}
|
|
}
|
|
}
|
|
// Setup the Yggdrasil node itself. The node{} type includes a Core, so we
|
|
// don't need to create this manually.
|
|
n := node{}
|
|
// Now start Yggdrasil - this starts the DHT, router, switch and other core
|
|
// components needed for Yggdrasil to operate
|
|
n.state, err = n.core.Start(cfg, logger)
|
|
if err != nil {
|
|
logger.Errorln("An error occurred during startup")
|
|
panic(err)
|
|
}
|
|
// Register the session firewall gatekeeper function
|
|
n.core.SetSessionGatekeeper(n.sessionFirewall)
|
|
// Start the admin socket
|
|
n.admin.Init(&n.core, n.state, logger, nil)
|
|
if err := n.admin.Start(); err != nil {
|
|
logger.Errorln("An error occurred starting admin socket:", err)
|
|
}
|
|
// Start the multicast interface
|
|
n.multicast.Init(&n.core, n.state, logger, nil)
|
|
if err := n.multicast.Start(); err != nil {
|
|
logger.Errorln("An error occurred starting multicast:", err)
|
|
}
|
|
n.multicast.SetupAdminHandlers(&n.admin)
|
|
// Start the TUN/TAP interface
|
|
if listener, err := n.core.ConnListen(); err == nil {
|
|
if dialer, err := n.core.ConnDialer(); err == nil {
|
|
n.tuntap.Init(n.state, logger, listener, dialer)
|
|
if err := n.tuntap.Start(); err != nil {
|
|
logger.Errorln("An error occurred starting TUN/TAP:", err)
|
|
}
|
|
n.tuntap.SetupAdminHandlers(&n.admin)
|
|
} else {
|
|
logger.Errorln("Unable to get Dialer:", err)
|
|
}
|
|
} else {
|
|
logger.Errorln("Unable to get Listener:", 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.Address()
|
|
subnet := n.core.Subnet()
|
|
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.
|
|
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)
|
|
n.tuntap.UpdateConfig(cfg)
|
|
n.multicast.UpdateConfig(cfg)
|
|
} else {
|
|
logger.Errorln("Reloading config at runtime is only possible with -useconffile")
|
|
}
|
|
case _ = <-c:
|
|
goto exit
|
|
}
|
|
}
|
|
exit:
|
|
}
|
|
|
|
func (n *node) sessionFirewall(pubkey *crypto.BoxPubKey, initiator bool) bool {
|
|
n.state.Mutex.RLock()
|
|
defer n.state.Mutex.RUnlock()
|
|
|
|
// Allow by default if the session firewall is disabled
|
|
if !n.state.Current.SessionFirewall.Enable {
|
|
return true
|
|
}
|
|
|
|
// Prepare for checking whitelist/blacklist
|
|
var box crypto.BoxPubKey
|
|
// Reject blacklisted nodes
|
|
for _, b := range n.state.Current.SessionFirewall.BlacklistEncryptionPublicKeys {
|
|
key, err := hex.DecodeString(b)
|
|
if err == nil {
|
|
copy(box[:crypto.BoxPubKeyLen], key)
|
|
if box == *pubkey {
|
|
return false
|
|
}
|
|
}
|
|
}
|
|
|
|
// Allow whitelisted nodes
|
|
for _, b := range n.state.Current.SessionFirewall.WhitelistEncryptionPublicKeys {
|
|
key, err := hex.DecodeString(b)
|
|
if err == nil {
|
|
copy(box[:crypto.BoxPubKeyLen], key)
|
|
if box == *pubkey {
|
|
return true
|
|
}
|
|
}
|
|
}
|
|
|
|
// Allow outbound sessions if appropriate
|
|
if n.state.Current.SessionFirewall.AlwaysAllowOutbound {
|
|
if initiator {
|
|
return true
|
|
}
|
|
}
|
|
|
|
// Look and see if the pubkey is that of a direct peer
|
|
var isDirectPeer bool
|
|
for _, peer := range n.core.GetPeers() {
|
|
if peer.PublicKey == *pubkey {
|
|
isDirectPeer = true
|
|
break
|
|
}
|
|
}
|
|
|
|
// Allow direct peers if appropriate
|
|
if n.state.Current.SessionFirewall.AllowFromDirect && isDirectPeer {
|
|
return true
|
|
}
|
|
|
|
// Allow remote nodes if appropriate
|
|
if n.state.Current.SessionFirewall.AllowFromRemote && !isDirectPeer {
|
|
return true
|
|
}
|
|
|
|
// Finally, default-deny if not matching any of the above rules
|
|
return false
|
|
}
|