Merge pull request #301 from neilalexander/ios

Boilerplate for iOS support

build

@@ -6,12 +6,13 @@ PKGVER=${PKGVER:-$(sh contrib/semver/version.sh --bare)}
 
 LDFLAGS="-X $PKGSRC.buildName=$PKGNAME -X $PKGSRC.buildVersion=$PKGVER"
 
-while getopts "udtc:l:" option
+while getopts "udmtc:l:" option
 do
   case "${option}"
   in
   u) UPX=true;;
   d) DEBUG=true;;
+  m) MOBILE=true;;
   t) TABLES=true;;
   c) GCFLAGS="$GCFLAGS $OPTARG";;
   l) LDFLAGS="$LDFLAGS $OPTARG";;
@@ -25,7 +26,9 @@ fi
 for CMD in `ls cmd/` ; do
   echo "Building: $CMD"
 
-  if [ $DEBUG ]; then
+  if [ $MOBILE ]; then
+    go build -ldflags="$LDFLAGS" -gcflags="$GCFLAGS" -tags mobile -v ./cmd/$CMD
+  elif [ $DEBUG ]; then
     go build -ldflags="$LDFLAGS" -gcflags="$GCFLAGS" -tags debug -v ./cmd/$CMD
   else
     go build -ldflags="$LDFLAGS $STRIP" -gcflags="$GCFLAGS" -v ./cmd/$CMD

cmd/yggdrasil/main.go

@@ -2,13 +2,11 @@ package main
 
 import (
 	"bytes"
-	"encoding/hex"
 	"encoding/json"
 	"flag"
 	"fmt"
 	"io/ioutil"
 	"log"
-	"math/rand"
 	"os"
 	"os/signal"
 	"regexp"
@@ -23,7 +21,6 @@ import (
 	"github.com/mitchellh/mapstructure"
 
 	"github.com/yggdrasil-network/yggdrasil-go/src/config"
-	"github.com/yggdrasil-network/yggdrasil-go/src/defaults"
 	"github.com/yggdrasil-network/yggdrasil-go/src/yggdrasil"
 )
 
@@ -34,52 +31,10 @@ type node struct {
 	core Core
 }
 
-// Generates default configuration. This is used when outputting the -genconf
-// parameter and also when using -autoconf. The isAutoconf flag is used to
-// determine whether the operating system should select a free port by itself
-// (which guarantees that there will not be a conflict with any other services)
-// or whether to generate a random port number. The only side effect of setting
-// isAutoconf is that the TCP and UDP ports will likely end up with different
-// port numbers.
-func generateConfig(isAutoconf bool) *nodeConfig {
-	// Create a new core.
-	core := Core{}
-	// Generate encryption keys.
-	bpub, bpriv := core.NewEncryptionKeys()
-	spub, spriv := core.NewSigningKeys()
-	// Create a node configuration and populate it.
-	cfg := nodeConfig{}
-	if isAutoconf {
-		cfg.Listen = "[::]:0"
-	} else {
-		r1 := rand.New(rand.NewSource(time.Now().UnixNano()))
-		cfg.Listen = fmt.Sprintf("[::]:%d", r1.Intn(65534-32768)+32768)
-	}
-	cfg.AdminListen = defaults.GetDefaults().DefaultAdminListen
-	cfg.EncryptionPublicKey = hex.EncodeToString(bpub[:])
-	cfg.EncryptionPrivateKey = hex.EncodeToString(bpriv[:])
-	cfg.SigningPublicKey = hex.EncodeToString(spub[:])
-	cfg.SigningPrivateKey = hex.EncodeToString(spriv[:])
-	cfg.Peers = []string{}
-	cfg.InterfacePeers = map[string][]string{}
-	cfg.AllowedEncryptionPublicKeys = []string{}
-	cfg.MulticastInterfaces = []string{".*"}
-	cfg.IfName = defaults.GetDefaults().DefaultIfName
-	cfg.IfMTU = defaults.GetDefaults().DefaultIfMTU
-	cfg.IfTAPMode = defaults.GetDefaults().DefaultIfTAPMode
-	cfg.SessionFirewall.Enable = false
-	cfg.SessionFirewall.AllowFromDirect = true
-	cfg.SessionFirewall.AllowFromRemote = true
-	cfg.SwitchOptions.MaxTotalQueueSize = yggdrasil.SwitchQueueTotalMinSize
-	cfg.NodeInfoPrivacy = false
-
-	return &cfg
-}
-
 // Generates a new configuration and returns it in HJSON format. This is used
 // with -genconf.
 func doGenconf(isjson bool) string {
-	cfg := generateConfig(false)
+	cfg := config.GenerateConfig(false)
 	var bs []byte
 	var err error
 	if isjson {
@@ -114,19 +69,19 @@ func main() {
 	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 = generateConfig(true)
+		cfg = config.GenerateConfig(true)
 	case *useconffile != "" || *useconf:
 		// Use a configuration file. If -useconf, the configuration will be read
 		// from stdin. If -useconffile, the configuration will be read from the
 		// filesystem.
-		var config []byte
+		var configjson []byte
 		var err error
 		if *useconffile != "" {
 			// Read the file from the filesystem
-			config, err = ioutil.ReadFile(*useconffile)
+			configjson, err = ioutil.ReadFile(*useconffile)
 		} else {
 			// Read the file from stdin.
-			config, err = ioutil.ReadAll(os.Stdin)
+			configjson, err = ioutil.ReadAll(os.Stdin)
 		}
 		if err != nil {
 			panic(err)
@@ -135,11 +90,11 @@ func main() {
 		// 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(config[0:2], []byte{0xFF, 0xFE}) == 0 ||
-			bytes.Compare(config[0:2], []byte{0xFE, 0xFF}) == 0 {
+		if bytes.Compare(configjson[0:2], []byte{0xFF, 0xFE}) == 0 ||
+			bytes.Compare(configjson[0:2], []byte{0xFE, 0xFF}) == 0 {
 			utf := unicode.UTF16(unicode.BigEndian, unicode.UseBOM)
 			decoder := utf.NewDecoder()
-			config, err = decoder.Bytes(config)
+			configjson, err = decoder.Bytes(configjson)
 			if err != nil {
 				panic(err)
 			}
@@ -148,9 +103,9 @@ func main() {
 		// 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 = generateConfig(false)
+		cfg = config.GenerateConfig(false)
 		var dat map[string]interface{}
-		if err := hjson.Unmarshal(config, &dat); err != nil {
+		if err := hjson.Unmarshal(configjson, &dat); err != nil {
 			panic(err)
 		}
 		confJson, err := json.Marshal(dat)

src/config/config.go

@@ -1,5 +1,15 @@
 package config
 
+import (
+	"encoding/hex"
+	"fmt"
+	"math/rand"
+	"time"
+
+	"github.com/yggdrasil-network/yggdrasil-go/src/crypto"
+	"github.com/yggdrasil-network/yggdrasil-go/src/defaults"
+)
+
 // NodeConfig defines all configuration values needed to run a signle yggdrasil node
 type NodeConfig struct {
 	Listen                      string                 `comment:"Listen address for peer connections. Default is to listen for all\nTCP connections over IPv4 and IPv6 with a random port."`
@@ -53,3 +63,45 @@ type TunnelRouting struct {
 type SwitchOptions struct {
 	MaxTotalQueueSize uint64 `comment:"Maximum size of all switch queues combined (in bytes)."`
 }
+
+// Generates default configuration. This is used when outputting the -genconf
+// parameter and also when using -autoconf. The isAutoconf flag is used to
+// determine whether the operating system should select a free port by itself
+// (which guarantees that there will not be a conflict with any other services)
+// or whether to generate a random port number. The only side effect of setting
+// isAutoconf is that the TCP and UDP ports will likely end up with different
+// port numbers.
+func GenerateConfig(isAutoconf bool) *NodeConfig {
+	// Create a new core.
+	//core := Core{}
+	// Generate encryption keys.
+	bpub, bpriv := crypto.NewBoxKeys()
+	spub, spriv := crypto.NewSigKeys()
+	// Create a node configuration and populate it.
+	cfg := NodeConfig{}
+	if isAutoconf {
+		cfg.Listen = "[::]:0"
+	} else {
+		r1 := rand.New(rand.NewSource(time.Now().UnixNano()))
+		cfg.Listen = fmt.Sprintf("[::]:%d", r1.Intn(65534-32768)+32768)
+	}
+	cfg.AdminListen = defaults.GetDefaults().DefaultAdminListen
+	cfg.EncryptionPublicKey = hex.EncodeToString(bpub[:])
+	cfg.EncryptionPrivateKey = hex.EncodeToString(bpriv[:])
+	cfg.SigningPublicKey = hex.EncodeToString(spub[:])
+	cfg.SigningPrivateKey = hex.EncodeToString(spriv[:])
+	cfg.Peers = []string{}
+	cfg.InterfacePeers = map[string][]string{}
+	cfg.AllowedEncryptionPublicKeys = []string{}
+	cfg.MulticastInterfaces = []string{".*"}
+	cfg.IfName = defaults.GetDefaults().DefaultIfName
+	cfg.IfMTU = defaults.GetDefaults().DefaultIfMTU
+	cfg.IfTAPMode = defaults.GetDefaults().DefaultIfTAPMode
+	cfg.SessionFirewall.Enable = false
+	cfg.SessionFirewall.AllowFromDirect = true
+	cfg.SessionFirewall.AllowFromRemote = true
+	cfg.SwitchOptions.MaxTotalQueueSize = 4 * 1024 * 1024
+	cfg.NodeInfoPrivacy = false
+
+	return &cfg
+}

src/yggdrasil/adapter.go

@@ -1,17 +1,8 @@
 package yggdrasil
 
-// Defines the minimum required functions for an adapter type.
-type AdapterInterface interface {
-	init(core *Core, send chan<- []byte, recv <-chan []byte)
-	read() error
-	write() error
-	close() error
-}
-
 // Defines the minimum required struct members for an adapter type (this is
 // now the base type for tunAdapter in tun.go)
 type Adapter struct {
-	AdapterInterface
 	core *Core
 	send chan<- []byte
 	recv <-chan []byte

src/yggdrasil/awdl.go

@@ -0,0 +1,147 @@
+package yggdrasil
+
+import (
+	"errors"
+	"fmt"
+	"sync"
+	"sync/atomic"
+	"time"
+
+	"github.com/yggdrasil-network/yggdrasil-go/src/crypto"
+	"github.com/yggdrasil-network/yggdrasil-go/src/util"
+)
+
+type awdl struct {
+	core       *Core
+	mutex      sync.RWMutex // protects interfaces below
+	interfaces map[string]*awdlInterface
+}
+
+type awdlInterface struct {
+	awdl     *awdl
+	fromAWDL chan []byte
+	toAWDL   chan []byte
+	shutdown chan bool
+	peer     *peer
+}
+
+func (l *awdl) init(c *Core) error {
+	l.core = c
+	l.mutex.Lock()
+	l.interfaces = make(map[string]*awdlInterface)
+	l.mutex.Unlock()
+
+	return nil
+}
+
+func (l *awdl) create(fromAWDL chan []byte, toAWDL chan []byte, boxPubKey *crypto.BoxPubKey, sigPubKey *crypto.SigPubKey, name string) (*awdlInterface, error) {
+	/*
+		myLinkPub, myLinkPriv := crypto.NewBoxKeys()
+		meta := version_getBaseMetadata()
+		meta.box = l.core.boxPub
+		meta.sig = l.core.sigPub
+		meta.link = *myLinkPub
+		metaBytes := meta.encode()
+		l.core.log.Println("toAWDL <- metaBytes")
+		toAWDL <- metaBytes
+		l.core.log.Println("metaBytes = <-fromAWDL")
+		metaBytes = <-fromAWDL
+		l.core.log.Println("version_metadata{}")
+		meta = version_metadata{}
+		if !meta.decode(metaBytes) || !meta.check() {
+			return nil, errors.New("Metadata decode failure")
+		}
+		base := version_getBaseMetadata()
+		if meta.ver > base.ver || meta.ver == base.ver && meta.minorVer > base.minorVer {
+			return nil, errors.New("Failed to connect to node: " + name + " version: " + fmt.Sprintf("%d.%d", meta.ver, meta.minorVer))
+		}
+		shared := crypto.GetSharedKey(myLinkPriv, &meta.link)
+	*/
+	shared := crypto.GetSharedKey(&l.core.boxPriv, boxPubKey)
+	intf := awdlInterface{
+		awdl:     l,
+		fromAWDL: fromAWDL,
+		toAWDL:   toAWDL,
+		shutdown: make(chan bool),
+		peer:     l.core.peers.newPeer(boxPubKey, sigPubKey, shared, name),
+		//peer:     l.core.peers.newPeer(&meta.box, &meta.sig, shared, name),
+	}
+	if intf.peer != nil {
+		l.mutex.Lock()
+		l.interfaces[name] = &intf
+		l.mutex.Unlock()
+		intf.peer.linkOut = make(chan []byte, 1) // protocol traffic
+		intf.peer.out = func(msg []byte) {
+			defer func() { recover() }()
+			intf.toAWDL <- msg
+		} // called by peer.sendPacket()
+		l.core.switchTable.idleIn <- intf.peer.port // notify switch that we're idle
+		intf.peer.close = func() {
+			close(intf.fromAWDL)
+			close(intf.toAWDL)
+		}
+		go intf.handler()
+		go intf.peer.linkLoop()
+		return &intf, nil
+	}
+	return nil, errors.New("l.core.peers.newPeer failed")
+}
+
+func (l *awdl) getInterface(identity string) *awdlInterface {
+	l.mutex.RLock()
+	defer l.mutex.RUnlock()
+	if intf, ok := l.interfaces[identity]; ok {
+		return intf
+	}
+	return nil
+}
+
+func (l *awdl) shutdown(identity string) error {
+	if intf, ok := l.interfaces[identity]; ok {
+		intf.shutdown <- true
+		l.core.peers.removePeer(intf.peer.port)
+		l.mutex.Lock()
+		delete(l.interfaces, identity)
+		l.mutex.Unlock()
+		return nil
+	} else {
+		return errors.New(fmt.Sprintf("Interface '%s' doesn't exist or already shutdown", identity))
+	}
+}
+
+func (ai *awdlInterface) handler() {
+	send := func(msg []byte) {
+		ai.toAWDL <- msg
+		atomic.AddUint64(&ai.peer.bytesSent, uint64(len(msg)))
+		util.PutBytes(msg)
+	}
+	for {
+		timerInterval := tcp_ping_interval
+		timer := time.NewTimer(timerInterval)
+		defer timer.Stop()
+		select {
+		case p := <-ai.peer.linkOut:
+			send(p)
+			continue
+		default:
+		}
+		timer.Stop()
+		select {
+		case <-timer.C:
+		default:
+		}
+		timer.Reset(timerInterval)
+		select {
+		case _ = <-timer.C:
+			send([]byte{})
+		case p := <-ai.peer.linkOut:
+			send(p)
+			continue
+		case r := <-ai.fromAWDL:
+			ai.peer.handlePacket(r)
+			ai.awdl.core.switchTable.idleIn <- ai.peer.port
+		case <-ai.shutdown:
+			return
+		}
+	}
+}

src/yggdrasil/core.go

@@ -35,6 +35,7 @@ type Core struct {
 	multicast   multicast
 	nodeinfo    nodeinfo
 	tcp         tcpInterface
+	awdl        awdl
 	log         *log.Logger
 	ifceExpr    []*regexp.Regexp // the zone of link-local IPv6 peers must match this
 }
@@ -132,6 +133,11 @@ func (c *Core) Start(nc *config.NodeConfig, log *log.Logger) error {
 		return err
 	}
 
+	if err := c.awdl.init(c); err != nil {
+		c.log.Println("Failed to start AWDL interface")
+		return err
+	}
+
 	if nc.SwitchOptions.MaxTotalQueueSize >= SwitchQueueTotalMinSize {
 		c.switchTable.queueTotalMaxSize = nc.SwitchOptions.MaxTotalQueueSize
 	}

src/yggdrasil/mobile.go

@@ -0,0 +1,167 @@
+// +build mobile
+
+package yggdrasil
+
+import (
+	"encoding/hex"
+	"encoding/json"
+	"errors"
+	"log"
+	"os"
+	"regexp"
+
+	hjson "github.com/hjson/hjson-go"
+	"github.com/mitchellh/mapstructure"
+	"github.com/yggdrasil-network/yggdrasil-go/src/config"
+	"github.com/yggdrasil-network/yggdrasil-go/src/crypto"
+	"github.com/yggdrasil-network/yggdrasil-go/src/util"
+)
+
+// This file is meant to "plug the gap" for mobile support, as Gomobile will
+// not create headers for Swift/Obj-C etc if they have complex (non-native)
+// types. Therefore for iOS we will expose some nice simple functions. Note
+// that in the case of iOS we handle reading/writing to/from TUN in Swift
+// therefore we use the "dummy" TUN interface instead.
+
+func (c *Core) StartAutoconfigure() error {
+	mobilelog := MobileLogger{}
+	logger := log.New(mobilelog, "", 0)
+	nc := config.GenerateConfig(true)
+	nc.IfName = "dummy"
+	nc.AdminListen = "tcp://localhost:9001"
+	nc.Peers = []string{}
+	if hostname, err := os.Hostname(); err == nil {
+		nc.NodeInfo = map[string]interface{}{"name": hostname}
+	}
+	ifceExpr, err := regexp.Compile(".*")
+	if err == nil {
+		c.ifceExpr = append(c.ifceExpr, ifceExpr)
+	}
+	if err := c.Start(nc, logger); err != nil {
+		return err
+	}
+	return nil
+}
+
+func (c *Core) StartJSON(configjson []byte) error {
+	mobilelog := MobileLogger{}
+	logger := log.New(mobilelog, "", 0)
+	nc := config.GenerateConfig(false)
+	var dat map[string]interface{}
+	if err := hjson.Unmarshal(configjson, &dat); err != nil {
+		return err
+	}
+	if err := mapstructure.Decode(dat, &nc); err != nil {
+		return err
+	}
+	nc.IfName = "dummy"
+	for _, ll := range nc.MulticastInterfaces {
+		ifceExpr, err := regexp.Compile(ll)
+		if err != nil {
+			panic(err)
+		}
+		c.AddMulticastInterfaceExpr(ifceExpr)
+	}
+	if err := c.Start(nc, logger); err != nil {
+		return err
+	}
+	return nil
+}
+
+func GenerateConfigJSON() []byte {
+	nc := config.GenerateConfig(false)
+	nc.IfName = "dummy"
+	if json, err := json.Marshal(nc); err == nil {
+		return json
+	} else {
+		return nil
+	}
+}
+
+func (c *Core) GetAddressString() string {
+	return c.GetAddress().String()
+}
+
+func (c *Core) GetSubnetString() string {
+	return c.GetSubnet().String()
+}
+
+func (c *Core) RouterRecvPacket() ([]byte, error) {
+	packet := <-c.router.tun.recv
+	return packet, nil
+}
+
+func (c *Core) RouterSendPacket(buf []byte) error {
+	packet := append(util.GetBytes(), buf[:]...)
+	c.router.tun.send <- packet
+	return nil
+}
+
+func (c *Core) AWDLCreateInterface(boxPubKey string, sigPubKey string, name string) error {
+	fromAWDL := make(chan []byte, 32)
+	toAWDL := make(chan []byte, 32)
+
+	var boxPub crypto.BoxPubKey
+	var sigPub crypto.SigPubKey
+	boxPubHex, err := hex.DecodeString(boxPubKey)
+	if err != nil {
+		c.log.Println(err)
+		return err
+	}
+	sigPubHex, err := hex.DecodeString(sigPubKey)
+	if err != nil {
+		c.log.Println(err)
+		return err
+	}
+	copy(boxPub[:], boxPubHex)
+	copy(sigPub[:], sigPubHex)
+
+	if intf, err := c.awdl.create(fromAWDL, toAWDL, &boxPub, &sigPub, name); err == nil {
+		if intf != nil {
+			c.log.Println(err)
+			return err
+		} else {
+			c.log.Println("c.awdl.create didn't return an interface")
+			return errors.New("c.awdl.create didn't return an interface")
+		}
+	} else {
+		c.log.Println(err)
+		return err
+	}
+}
+
+func (c *Core) AWDLCreateInterfaceFromContext(context []byte, name string) error {
+	if len(context) < crypto.BoxPubKeyLen+crypto.SigPubKeyLen {
+		return errors.New("Not enough bytes in context")
+	}
+	boxPubKey := hex.EncodeToString(context[:crypto.BoxPubKeyLen])
+	sigPubKey := hex.EncodeToString(context[crypto.BoxPubKeyLen:])
+	return c.AWDLCreateInterface(boxPubKey, sigPubKey, name)
+}
+
+func (c *Core) AWDLShutdownInterface(name string) error {
+	return c.awdl.shutdown(name)
+}
+
+func (c *Core) AWDLRecvPacket(identity string) ([]byte, error) {
+	if intf := c.awdl.getInterface(identity); intf != nil {
+		return <-intf.toAWDL, nil
+	}
+	return nil, errors.New("AWDLRecvPacket identity not known: " + identity)
+}
+
+func (c *Core) AWDLSendPacket(identity string, buf []byte) error {
+	packet := append(util.GetBytes(), buf[:]...)
+	if intf := c.awdl.getInterface(identity); intf != nil {
+		intf.fromAWDL <- packet
+		return nil
+	}
+	return errors.New("AWDLSendPacket identity not known: " + identity)
+}
+
+func (c *Core) AWDLConnectionContext() []byte {
+	var context []byte
+	context = append(context, c.boxPub[:]...)
+	context = append(context, c.sigPub[:]...)
+	return context
+}

src/yggdrasil/mobile_ios.go

@@ -0,0 +1,25 @@
+// +build mobile,darwin
+
+package yggdrasil
+
+/*
+#cgo CFLAGS: -x objective-c
+#cgo LDFLAGS: -framework Foundation
+#import <Foundation/Foundation.h>
+void Log(const char *text) {
+  NSString *nss = [NSString stringWithUTF8String:text];
+  NSLog(@"%@", nss);
+}
+*/
+import "C"
+import "unsafe"
+
+type MobileLogger struct {
+}
+
+func (nsl MobileLogger) Write(p []byte) (n int, err error) {
+	p = append(p, 0)
+	cstr := (*C.char)(unsafe.Pointer(&p[0]))
+	C.Log(cstr)
+	return len(p), nil
+}

src/yggdrasil/peer.go

@@ -217,6 +217,7 @@ func (p *peer) handlePacket(packet []byte) {
 	default:
 		util.PutBytes(packet)
 	}
+	return
 }
 
 // Called to handle traffic or protocolTraffic packets.

src/yggdrasil/tun.go

@@ -47,11 +47,13 @@ func (tun *tunAdapter) init(core *Core, send chan<- []byte, recv <-chan []byte)
 // Starts the setup process for the TUN/TAP adapter, and if successful, starts
 // the read/write goroutines to handle packets on that interface.
 func (tun *tunAdapter) start(ifname string, iftapmode bool, addr string, mtu int) error {
-	if ifname == "none" {
-		return nil
+	if ifname != "none" {
+		if err := tun.setup(ifname, iftapmode, addr, mtu); err != nil {
+			return err
+		}
 	}
-	if err := tun.setup(ifname, iftapmode, addr, mtu); err != nil {
-		return err
+	if ifname == "none" || ifname == "dummy" {
+		return nil
 	}
 	tun.mutex.Lock()
 	tun.isOpen = true

src/yggdrasil/tun_darwin.go

@@ -1,3 +1,5 @@
+// +build !mobile
+
 package yggdrasil
 
 // The darwin platform specific tun parts

src/yggdrasil/tun_dummy.go

@@ -0,0 +1,19 @@
+// +build mobile
+
+package yggdrasil
+
+// This is to catch unsupported platforms
+// If your platform supports tun devices, you could try configuring it manually
+
+// Creates the TUN/TAP adapter, if supported by the Water library. Note that
+// no guarantees are made at this point on an unsupported platform.
+func (tun *tunAdapter) setup(ifname string, iftapmode bool, addr string, mtu int) error {
+	tun.mtu = getSupportedMTU(mtu)
+	return tun.setupAddress(addr)
+}
+
+// We don't know how to set the IPv6 address on an unknown platform, therefore
+// write about it to stdout and don't try to do anything further.
+func (tun *tunAdapter) setupAddress(addr string) error {
+	return nil
+}

src/yggdrasil/tun_linux.go

@@ -1,3 +1,5 @@
+// +build !mobile
+
 package yggdrasil
 
 // The linux platform specific tun parts

src/yggdrasil/tun_other.go

@@ -1,4 +1,4 @@
-// +build !linux,!darwin,!windows,!openbsd,!freebsd,!netbsd
+// +build !linux,!darwin,!windows,!openbsd,!freebsd,!netbsd,!mobile
 
 package yggdrasil