Merge pull request #4 from vikulin/future

Future merge

.circleci/config.yml

@@ -16,6 +16,11 @@ jobs:
               go get github.com/golangci/golangci-lint/cmd/golangci-lint@v1.31.0
               golangci-lint run
 
+      - run:
+          name: Run Go tests
+          command: |
+              go test ./...
+
   build-linux:
     docker:
       - image: circleci/golang:1.16

cmd/yggdrasil/main.go

@@ -27,7 +27,6 @@ import (
 	"github.com/yggdrasil-network/yggdrasil-go/src/config"
 
 	"github.com/yggdrasil-network/yggdrasil-go/src/core"
-	"github.com/yggdrasil-network/yggdrasil-go/src/module"
 	"github.com/yggdrasil-network/yggdrasil-go/src/multicast"
 	"github.com/yggdrasil-network/yggdrasil-go/src/tuntap"
 	"github.com/yggdrasil-network/yggdrasil-go/src/version"
@@ -36,12 +35,12 @@ import (
 type node struct {
 	core      core.Core
 	config    *config.NodeConfig
-	tuntap    module.Module // tuntap.TunAdapter
+	tuntap    *tuntap.TunAdapter
-	multicast module.Module // multicast.Multicast
+	multicast *multicast.Multicast
-	admin     module.Module // admin.AdminSocket
+	admin     *admin.AdminSocket
 }
 
-func readConfig(useconf *bool, useconffile *string, normaliseconf *bool) *config.NodeConfig {
+func readConfig(log *log.Logger, 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.
@@ -79,27 +78,21 @@ func readConfig(useconf *bool, useconffile *string, normaliseconf *bool) *config
 	if err := hjson.Unmarshal(conf, &dat); err != nil {
 		panic(err)
 	}
-	// Check for fields that have changed type recently, e.g. the Listen config
+	// Check if we have old field names
-	// option is now a []string rather than a string
+	if _, ok := dat["TunnelRouting"]; ok {
-	if listen, ok := dat["Listen"].(string); ok {
+		log.Warnln("WARNING: Tunnel routing is no longer supported")
-		dat["Listen"] = []string{listen}
 	}
-	if tunnelrouting, ok := dat["TunnelRouting"].(map[string]interface{}); ok {
+	if old, ok := dat["SigningPrivateKey"]; ok {
-		if c, ok := tunnelrouting["IPv4Sources"]; ok {
+		log.Warnln("WARNING: The \"SigningPrivateKey\" configuration option has been renamed to \"PrivateKey\"")
-			delete(tunnelrouting, "IPv4Sources")
+		if _, ok := dat["PrivateKey"]; !ok {
-			tunnelrouting["IPv4LocalSubnets"] = c
+			if privstr, err := hex.DecodeString(old.(string)); err == nil {
-		}
+				priv := ed25519.PrivateKey(privstr)
-		if c, ok := tunnelrouting["IPv6Sources"]; ok {
+				pub := priv.Public().(ed25519.PublicKey)
-			delete(tunnelrouting, "IPv6Sources")
+				dat["PrivateKey"] = hex.EncodeToString(priv[:])
-			tunnelrouting["IPv6LocalSubnets"] = c
+				dat["PublicKey"] = hex.EncodeToString(pub[:])
-		}
+			} else {
-		if c, ok := tunnelrouting["IPv4Destinations"]; ok {
+				log.Warnln("WARNING: The \"SigningPrivateKey\" configuration option contains an invalid value and will be ignored")
-			delete(tunnelrouting, "IPv4Destinations")
+			}
-			tunnelrouting["IPv4RemoteSubnets"] = c
-		}
-		if c, ok := tunnelrouting["IPv6Destinations"]; ok {
-			delete(tunnelrouting, "IPv6Destinations")
-			tunnelrouting["IPv6RemoteSubnets"] = c
 		}
 	}
 	// Sanitise the config
@@ -177,6 +170,31 @@ func main() {
 	loglevel := flag.String("loglevel", "info", "loglevel to enable")
 	flag.Parse()
 
+	// 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())
+		}
+	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)
+	}
+
 	var cfg *config.NodeConfig
 	var err error
 	switch {
@@ -190,7 +208,7 @@ func main() {
 		cfg = config.GenerateConfig()
 	case *useconffile != "" || *useconf:
 		// Read the configuration from either stdin or from the filesystem
-		cfg = readConfig(useconf, useconffile, normaliseconf)
+		cfg = readConfig(logger, 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
@@ -223,8 +241,8 @@ func main() {
 	}
 	// Have we been asked for the node address yet? If so, print it and then stop.
 	getNodeKey := func() ed25519.PublicKey {
-		if pubkey, err := hex.DecodeString(cfg.PublicKey); err == nil {
+		if pubkey, err := hex.DecodeString(cfg.PrivateKey); err == nil {
-			return ed25519.PublicKey(pubkey)
+			return ed25519.PrivateKey(pubkey).Public().(ed25519.PublicKey)
 		}
 		return nil
 	}
@@ -248,30 +266,10 @@ func main() {
 		return
 	default:
 	}
-	// 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())
-		}
-	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")
-	}
-
-	setLogLevel(*loglevel, logger)
 
 	// Setup the Yggdrasil node itself. The node{} type includes a Core, so we
 	// don't need to create this manually.
-	n := node{}
+	n := node{config: cfg}
 	// Now start Yggdrasil - this starts the DHT, router, switch and other core
 	// components needed for Yggdrasil to operate
 	if err = n.core.Start(cfg, logger); err != nil {
@@ -283,32 +281,34 @@ func main() {
 	n.admin = &admin.AdminSocket{}
 	n.multicast = &multicast.Multicast{}
 	n.tuntap = &tuntap.TunAdapter{}
-	n.tuntap.(*tuntap.TunAdapter).SetSessionGatekeeper(n.sessionFirewall)
+	n.tuntap.SetSessionGatekeeper(n.sessionFirewall)
 	// Start the admin socket
 	if err := n.admin.Init(&n.core, cfg, logger, nil); err != nil {
-		logger.Errorln("An error occured initialising admin socket:", err)
+		logger.Errorln("An error occurred initialising admin socket:", err)
 	} else if err := n.admin.Start(); err != nil {
 		logger.Errorln("An error occurred starting admin socket:", err)
 	}
-	n.admin.SetupAdminHandlers(n.admin.(*admin.AdminSocket))
+	n.admin.SetupAdminHandlers(n.admin)
 	// Start the multicast interface
 	if err := n.multicast.Init(&n.core, cfg, logger, nil); err != nil {
-		logger.Errorln("An error occured initialising multicast:", err)
+		logger.Errorln("An error occurred initialising multicast:", err)
 	} else if err := n.multicast.Start(); err != nil {
 		logger.Errorln("An error occurred starting multicast:", err)
 	}
-	n.multicast.SetupAdminHandlers(n.admin.(*admin.AdminSocket))
+	n.multicast.SetupAdminHandlers(n.admin)
 	// Start the TUN/TAP interface
 	if err := n.tuntap.Init(&n.core, cfg, logger, nil); err != nil {
 		logger.Errorln("An error occurred initialising TUN/TAP:", err)
 	} else if err := n.tuntap.Start(); err != nil {
 		logger.Errorln("An error occurred starting TUN/TAP:", err)
 	}
-	n.tuntap.SetupAdminHandlers(n.admin.(*admin.AdminSocket))
+	n.tuntap.SetupAdminHandlers(n.admin)
 	// 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()
+	public := n.core.GetSelf().Key
+	logger.Infof("Your public key is %s", hex.EncodeToString(public[:]))
 	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.

cmd/yggdrasilctl/main.go

@@ -47,8 +47,11 @@ func run() int {
 		fmt.Fprintf(flag.CommandLine.Output(), "Usage: %s [options] command [key=value] [key=value] ...\n\n", os.Args[0])
 		fmt.Println("Options:")
 		flag.PrintDefaults()
-		fmt.Println("\nPlease note that options must always specified BEFORE the command\non the command line or they will be ignored.\n") // nolint:govet
+		fmt.Println()
-		fmt.Println("Commands:\n  - Use \"list\" for a list of available commands\n")                                                      // nolint:govet
+		fmt.Println("Please note that options must always specified BEFORE the command\non the command line or they will be ignored.")
+		fmt.Println()
+		fmt.Println("Commands:\n  - Use \"list\" for a list of available commands")
+		fmt.Println()
 		fmt.Println("Examples:")
 		fmt.Println("  - ", os.Args[0], "list")
 		fmt.Println("  - ", os.Args[0], "getPeers")
@@ -288,6 +291,9 @@ func run() int {
 				if subnet, ok := v.(map[string]interface{})["subnet"].(string); ok {
 					fmt.Println("IPv6 subnet:", subnet)
 				}
+				if boxSigKey, ok := v.(map[string]interface{})["key"].(string); ok {
+					fmt.Println("Public key:", boxSigKey)
+				}
 				if coords, ok := v.(map[string]interface{})["coords"].(string); ok {
 					fmt.Println("Coords:", coords)
 				}

contrib/semver/version.sh

@@ -1,46 +1,8 @@
 #!/bin/sh
 
-# Get the last tag
+if [[ $* == *--bare* ]]; then
-TAG=$(git describe --abbrev=0 --tags --match="v[0-9]*\.[0-9]*\.[0-9]*" 2>/dev/null)
+    # Remove the "v" prefix
-
+    git describe --tags --match="v[0-9]*\.[0-9]*\.[0-9]*" | cut -c 2-
-# Did getting the tag succeed?
-if [ $? != 0 ] || [ -z "$TAG" ]; then
-  printf -- "unknown"
-  exit 0
-fi
-
-# Get the current branch
-BRANCH=$(git symbolic-ref -q HEAD --short 2>/dev/null)
-
-# Did getting the branch succeed?
-if [ $? != 0 ] || [ -z "$BRANCH" ]; then
-  BRANCH="master"
-fi
-
-# Split out into major, minor and patch numbers
-MAJOR=$(echo $TAG | cut -c 2- | cut -d "." -f 1)
-MINOR=$(echo $TAG | cut -c 2- | cut -d "." -f 2)
-PATCH=$(echo $TAG | cut -c 2- | cut -d "." -f 3)
-
-# Output in the desired format
-if [ $((PATCH)) -eq 0 ]; then
-  printf '%s%d.%d' "$PREPEND" "$((MAJOR))" "$((MINOR))"
 else
-  printf '%s%d.%d.%d' "$PREPEND" "$((MAJOR))" "$((MINOR))" "$((PATCH))"
+    git describe --tags --match="v[0-9]*\.[0-9]*\.[0-9]*"
-fi
-
-# Add the build tag on non-master branches
-if [ "$BRANCH" != "master" ]; then
-  BUILD=$(git rev-list --count $TAG..HEAD 2>/dev/null)
-
-  # Did getting the count of commits since the tag succeed?
-  if [ $? != 0 ] || [ -z "$BUILD" ]; then
-    printf -- "-unknown"
-    exit 0
-  fi
-
-  # Is the build greater than zero?
-  if [ $((BUILD)) -gt 0 ]; then
-      printf -- "-%04d" "$((BUILD))"
-  fi
 fi

src/config/config.go

@@ -28,7 +28,7 @@ import (
 // options that are necessary for an Yggdrasil node to run. You will need to
 // supply one of these structs to the Yggdrasil core when starting a node.
 type NodeConfig struct {
-	sync.RWMutex
+	sync.RWMutex        `json:"-"`
 	Peers               []string               `comment:"List of connection strings for outbound peer connections in URI format,\ne.g. tcp://a.b.c.d:e or socks://a.b.c.d:e/f.g.h.i:j. These connections\nwill obey the operating system routing table, therefore you should\nuse this section when you may connect via different interfaces."`
 	InterfacePeers      map[string][]string    `comment:"List of connection strings for outbound peer connections in URI format,\narranged by source interface, e.g. { \"eth0\": [ tcp://a.b.c.d:e ] }.\nNote that SOCKS peerings will NOT be affected by this option and should\ngo in the \"Peers\" section instead."`
 	Listen              []string               `comment:"Listen addresses for incoming connections. You will need to add\nlisteners in order to accept incoming peerings from non-local nodes.\nMulticast peer discovery will work regardless of any listeners set\nhere. Each listener should be specified in URI format as above, e.g.\ntcp://0.0.0.0:0 or tcp://[::]:0 to listen on all interfaces."`

src/core/doc.go

@@ -1,176 +0,0 @@
-/*
-Package core implements the core functionality of the Yggdrasil Network.
-
-Introduction
-
-Yggdrasil is a proof-of-concept mesh network which provides end-to-end encrypted
-communication between nodes in a decentralised fashion. The network is arranged
-using a globally-agreed spanning tree which provides each node with a locator
-(coordinates relative to the root) and a distributed hash table (DHT) mechanism
-for finding other nodes.
-
-Each node also implements a router, which is responsible for encryption of
-traffic, searches and connections, and a switch, which is responsible ultimately
-for forwarding traffic across the network.
-
-While many Yggdrasil nodes in existence today are IP nodes - that is, they are
-transporting IPv6 packets, like a kind of mesh VPN - it is also possible to
-integrate Yggdrasil into your own applications and use it as a generic data
-transport, similar to UDP.
-
-This library is what you need to integrate and use Yggdrasil in your own
-application.
-
-Basics
-
-In order to start an Yggdrasil node, you should start by generating node
-configuration, which amongst other things, includes encryption keypairs which
-are used to generate the node's identity, and supply a logger which Yggdrasil's
-output will be written to.
-
-This may look something like this:
-
-  import (
-    "os"
-    "github.com/gologme/log"
-    "github.com/yggdrasil-network/yggdrasil-go/src/config"
-    "github.com/yggdrasil-network/yggdrasil-go/src/core"
-  )
-
-  type node struct {
-    core   core.Core
-    config *config.NodeConfig
-    log    *log.Logger
-  }
-
-You then can supply node configuration and a logger:
-
-  n := node{}
-  n.log = log.New(os.Stdout, "", log.Flags())
-  n.config = config.GenerateConfig()
-
-In the above example, we ask the config package to supply new configuration each
-time, which results in fresh encryption keys and therefore a new identity. It is
-normally preferable in most cases to persist node configuration onto the
-filesystem or into some configuration store so that the node's identity does not
-change each time that the program starts. Note that Yggdrasil will automatically
-fill in any missing configuration items with sane defaults.
-
-Once you have supplied a logger and some node configuration, you can then start
-the node:
-
-  n.core.Start(n.config, n.log)
-
-Add some peers to connect to the network:
-
-  n.core.AddPeer("tcp://some-host.net:54321", "")
-  n.core.AddPeer("tcp://[2001::1:2:3]:54321", "")
-  n.core.AddPeer("tcp://1.2.3.4:54321", "")
-
-You can also ask the API for information about our node:
-
-  n.log.Println("My node ID is", n.core.NodeID())
-  n.log.Println("My public key is", n.core.EncryptionPublicKey())
-  n.log.Println("My coords are", n.core.Coords())
-
-Incoming Connections
-
-Once your node is started, you can then listen for connections from other nodes
-by asking the API for a Listener:
-
-  listener, err := n.core.ConnListen()
-  if err != nil {
-    // ...
-  }
-
-The Listener has a blocking Accept function which will wait for incoming
-connections from remote nodes. It will return a Conn when a connection is
-received. If the node never receives any incoming connections then this function
-can block forever, so be prepared for that, perhaps by listening in a separate
-goroutine.
-
-Assuming that you have defined a myConnectionHandler function to deal with
-incoming connections:
-
-  for {
-    conn, err := listener.Accept()
-    if err != nil {
-      // ...
-    }
-
-    // We've got a new connection
-    go myConnectionHandler(conn)
-  }
-
-Outgoing Connections
-
-If you know the node ID of the remote node that you want to talk to, you can
-dial an outbound connection to it. To do this, you should first ask the API for
-a Dialer:
-
-  dialer, err := n.core.ConnDialer()
-  if err != nil {
-    // ...
-  }
-
-You can then dial using the node's public key in hexadecimal format, for example:
-
-  conn, err := dialer.Dial("curve25519", "55071be281f50d0abbda63aadc59755624280c44b2f1f47684317aa4e0325604")
-  if err != nil {
-    // ...
-  }
-
-Using Connections
-
-Conn objects are implementations of io.ReadWriteCloser, and as such, you can
-Read, Write and Close them as necessary.
-
-Each Read or Write operation can deal with a buffer with a maximum size of 65535
-bytes - any bigger than this and the operation will return an error.
-
-For example, to write to the Conn from the supplied buffer:
-
-  buf := []byte{1, 2, 3, 4, 5}
-  w, err := conn.Write(buf)
-  if err != nil {
-    // ...
-  } else {
-    // written w bytes
-  }
-
-Reading from the Conn into the supplied buffer:
-
-  buf := make([]byte, 65535)
-  r, err := conn.Read(buf)
-  if err != nil {
-    // ...
-  } else {
-    // read r bytes
-  }
-
-When you are happy that a connection is no longer required, you can discard it:
-
-  err := conn.Close()
-  if err != nil {
-    // ...
-  }
-
-Limitations
-
-You should be aware of the following limitations when working with the Yggdrasil
-library:
-
-Individual messages written through Yggdrasil connections can not exceed 65535
-bytes in size. Yggdrasil has no concept of fragmentation, so if you try to send
-a message that exceeds 65535 bytes in size, it will be dropped altogether and
-an error will be returned.
-
-Yggdrasil connections are unreliable by nature. Messages are delivered on a
-best-effort basis, and employs congestion control where appropriate to ensure
-that congestion does not affect message transport, but Yggdrasil will not
-retransmit any messages that have been lost. If reliable delivery is important
-then you should manually implement acknowledgement and retransmission of
-messages.
-
-*/
-package core

src/module/module.go

@@ -1,19 +0,0 @@
-package module
-
-import (
-	"github.com/gologme/log"
-
-	"github.com/yggdrasil-network/yggdrasil-go/src/admin"
-	"github.com/yggdrasil-network/yggdrasil-go/src/config"
-	"github.com/yggdrasil-network/yggdrasil-go/src/core"
-)
-
-// Module is an interface that defines which functions must be supported by a
-// given Yggdrasil module.
-type Module interface {
-	Init(core *core.Core, state *config.NodeConfig, log *log.Logger, options interface{}) error
-	Start() error
-	Stop() error
-	SetupAdminHandlers(a *admin.AdminSocket)
-	IsStarted() bool
-}

src/multicast/multicast.go

@@ -2,6 +2,8 @@ package multicast
 
 import (
 	"context"
+	"crypto/ed25519"
+	"encoding/hex"
 	"fmt"
 	"net"
 	"net/url"
@@ -303,7 +305,8 @@ func (m *Multicast) _announce() {
 			if a, err := net.ResolveTCPAddr("tcp6", lladdr); err == nil {
 				a.Zone = ""
 				destAddr.Zone = iface.Name
-				msg := []byte(a.String())
+				msg := append([]byte(nil), m.core.GetSelf().Key...)
+				msg = append(msg, a.String()...)
 				_, _ = m.sock.WriteTo(msg, nil, destAddr)
 			}
 			if info.interval.Seconds() < 15 {
@@ -342,7 +345,12 @@ func (m *Multicast) listen() {
 				continue
 			}
 		}
-		anAddr := string(bs[:nBytes])
+		if len(bs) < ed25519.PublicKeySize {
+			continue
+		}
+		var key ed25519.PublicKey
+		key = append(key, bs[:ed25519.PublicKeySize]...)
+		anAddr := string(bs[ed25519.PublicKeySize:nBytes])
 		addr, err := net.ResolveTCPAddr("tcp6", anAddr)
 		if err != nil {
 			continue
@@ -357,7 +365,8 @@ func (m *Multicast) listen() {
 		})
 		if _, ok := interfaces[from.Zone]; ok {
 			addr.Zone = ""
-			u, err := url.Parse("tcp://" + addr.String())
+			pin := fmt.Sprintf("/?ed25519=%s", hex.EncodeToString(key))
+			u, err := url.Parse("tcp://" + addr.String() + pin)
 			if err != nil {
 				m.log.Debugln("Call from multicast failed, parse error:", addr.String(), err)
 			}

src/tuntap/iface.go

@@ -48,7 +48,7 @@ func (tun *TunAdapter) read() {
 		copy(srcSubnet[:], bs[8:])
 		copy(dstSubnet[:], bs[24:])
 		if srcAddr != tun.addr && srcSubnet != tun.subnet {
-			continue // Wrong soruce address
+			continue // Wrong source address
 		}
 		bs = buf[begin-1 : end]
 		bs[0] = typeSessionTraffic

src/tuntap/tun_darwin.go

@@ -90,7 +90,7 @@ func (tun *TunAdapter) setupAddress(addr string) error {
 	ar.ifra_prefixmask.sin6_len = uint8(unsafe.Sizeof(ar.ifra_prefixmask))
 	b := make([]byte, 16)
 	binary.LittleEndian.PutUint16(b, uint16(0xFE00))
-	ar.ifra_prefixmask.sin6_addr[0] = uint16(binary.BigEndian.Uint16(b))
+	ar.ifra_prefixmask.sin6_addr[0] = binary.BigEndian.Uint16(b)
 
 	ar.ifra_addr.sin6_len = uint8(unsafe.Sizeof(ar.ifra_addr))
 	ar.ifra_addr.sin6_family = unix.AF_INET6
@@ -99,7 +99,7 @@ func (tun *TunAdapter) setupAddress(addr string) error {
 		addr, _ := strconv.ParseUint(parts[i], 16, 16)
 		b := make([]byte, 16)
 		binary.LittleEndian.PutUint16(b, uint16(addr))
-		ar.ifra_addr.sin6_addr[i] = uint16(binary.BigEndian.Uint16(b))
+		ar.ifra_addr.sin6_addr[i] = binary.BigEndian.Uint16(b)
 	}
 
 	ar.ifra_flags |= darwin_IN6_IFF_NODAD

src/util/util.go

@@ -5,35 +5,9 @@ package util
 // These are misc. utility functions that didn't really fit anywhere else
 
 import (
-	"runtime"
-	"strconv"
-	"strings"
 	"time"
 )
 
-// Yield just executes runtime.Gosched(), and is included so we don't need to explicitly import runtime elsewhere.
-func Yield() {
-	runtime.Gosched()
-}
-
-// LockThread executes runtime.LockOSThread(), and is included so we don't need to explicitly import runtime elsewhere.
-func LockThread() {
-	runtime.LockOSThread()
-}
-
-// UnlockThread executes runtime.UnlockOSThread(), and is included so we don't need to explicitly import runtime elsewhere.
-func UnlockThread() {
-	runtime.UnlockOSThread()
-}
-
-// ResizeBytes returns a slice of the specified length. If the provided slice has sufficient capacity, it will be resized and returned rather than allocating a new slice.
-func ResizeBytes(bs []byte, length int) []byte {
-	if cap(bs) >= length {
-		return bs[:length]
-	}
-	return make([]byte, length)
-}
-
 // TimerStop stops a timer and makes sure the channel is drained, returns true if the timer was stopped before firing.
 func TimerStop(t *time.Timer) bool {
 	stopped := t.Stop()
@@ -61,70 +35,3 @@ func FuncTimeout(timeout time.Duration, f func()) bool {
 		return false
 	}
 }
-
-// Difference loops over two strings and returns the elements of A which do not appear in B.
-// This is somewhat useful when needing to determine which elements of a configuration file have changed.
-func Difference(a, b []string) []string {
-	ab := []string{}
-	mb := map[string]bool{}
-	for _, x := range b {
-		mb[x] = true
-	}
-	for _, x := range a {
-		if !mb[x] {
-			ab = append(ab, x)
-		}
-	}
-	return ab
-}
-
-// DecodeCoordString decodes a string representing coordinates in [1 2 3] format
-// and returns a []uint64.
-func DecodeCoordString(in string) (out []uint64) {
-	s := strings.Trim(in, "[]")
-	t := strings.Split(s, " ")
-	for _, a := range t {
-		if u, err := strconv.ParseUint(a, 0, 64); err == nil {
-			out = append(out, u)
-		}
-	}
-	return out
-}
-
-// GetFlowKey takes an IP packet as an argument and returns some information about the traffic flow.
-// For IPv4 packets, this is derived from the source and destination protocol and port numbers.
-// For IPv6 packets, this is derived from the FlowLabel field of the packet if this was set, otherwise it's handled like IPv4.
-// The FlowKey is then used internally by Yggdrasil for congestion control.
-func GetFlowKey(bs []byte) uint64 {
-	// Work out the flowkey - this is used to determine which switch queue
-	// traffic will be pushed to in the event of congestion
-	var flowkey uint64
-	// Get the IP protocol version from the packet
-	switch bs[0] & 0xf0 {
-	case 0x40: // IPv4 packet
-		ihl := (bs[0] & 0x0f) * 4 // whole IPv4 header length (min 20)
-		// 8 is minimum UDP packet length
-		if ihl >= 20 && len(bs)-int(ihl) >= 8 {
-			switch bs[9] /* protocol */ {
-			case 0x06 /* TCP */, 0x11 /* UDP */, 0x84 /* SCTP */ :
-				flowkey = uint64(bs[9])<<32 /* proto */ |
-					uint64(bs[ihl+0])<<24 | uint64(bs[ihl+1])<<16 /* sport */ |
-					uint64(bs[ihl+2])<<8 | uint64(bs[ihl+3]) /* dport */
-			}
-		}
-	case 0x60: // IPv6 packet
-		// Check if the flowlabel was specified in the packet header
-		flowkey = uint64(bs[1]&0x0f)<<16 | uint64(bs[2])<<8 | uint64(bs[3])
-		// If the flowlabel isn't present, make protokey from proto | sport | dport
-		// if the packet meets minimum UDP packet length
-		if flowkey == 0 && len(bs) >= 48 {
-			switch bs[9] /* protocol */ {
-			case 0x06 /* TCP */, 0x11 /* UDP */, 0x84 /* SCTP */ :
-				flowkey = uint64(bs[6])<<32 /* proto */ |
-					uint64(bs[40])<<24 | uint64(bs[41])<<16 /* sport */ |
-					uint64(bs[42])<<8 | uint64(bs[43]) /* dport */
-			}
-		}
-	}
-	return flowkey
-}

src/util/workerpool.go

@@ -1,29 +0,0 @@
-package util
-
-import "runtime"
-
-var workerPool chan func()
-
-func init() {
-	maxProcs := runtime.GOMAXPROCS(0)
-	if maxProcs < 1 {
-		maxProcs = 1
-	}
-	workerPool = make(chan func(), maxProcs)
-	for idx := 0; idx < maxProcs; idx++ {
-		go func() {
-			for f := range workerPool {
-				f()
-			}
-		}()
-	}
-}
-
-// WorkerGo submits a job to a pool of GOMAXPROCS worker goroutines.
-// This is meant for short non-blocking functions f() where you could just go f(),
-// but you want some kind of backpressure to prevent spawning endless goroutines.
-// WorkerGo returns as soon as the function is queued to run, not when it finishes.
-// In Yggdrasil, these workers are used for certain cryptographic operations.
-func WorkerGo(f func()) {
-	workerPool <- f
-}