Started migration to sub-packages

cookie.go

@@ -3,6 +3,7 @@ package main
 import (
 	"crypto/hmac"
 	"crypto/rand"
+	"git.zx2c4.com/wireguard-go/internal/xchacha20poly1305"
 	"golang.org/x/crypto/blake2s"
 	"golang.org/x/crypto/chacha20poly1305"
 	"sync"
@@ -154,7 +155,7 @@ func (st *CookieChecker) CreateReply(
 		return nil, err
 	}
 
-	XChaCha20Poly1305Encrypt(
+	xchacha20poly1305.Encrypt(
 		reply.Cookie[:0],
 		&reply.Nonce,
 		cookie[:],
@@ -198,7 +199,7 @@ func (st *CookieGenerator) ConsumeReply(msg *MessageCookieReply) bool {
 
 	var cookie [blake2s.Size128]byte
 
-	_, err := XChaCha20Poly1305Decrypt(
+	_, err := xchacha20poly1305.Decrypt(
 		cookie[:0],
 		&msg.Nonce,
 		msg.Cookie[:],

internal/events/event.go

@@ -0,0 +1,36 @@
+package events
+
+import (
+	"sync"
+)
+
+type Event interface {
+	Contains(int) bool
+	Processed()
+	WaitForProcessed()
+}
+
+type EventStruct struct {
+	code int
+	lock sync.Mutex
+}
+
+func (event EventStruct) Contains(code int) bool {
+	return event.code&code != 0
+}
+
+func (event *EventStruct) WaitForProcessed() {
+	event.lock.Lock()
+}
+
+func (event *EventStruct) Processed() {
+	event.lock.Unlock()
+}
+
+func NewEvent(code int) Event {
+	event := &EventStruct{
+		code: code,
+	}
+	event.lock.Lock()
+	return event
+}

internal/xchacha20poly1305/xchacha20.go

@@ -2,14 +2,14 @@
 // Use of this source code is governed by a license that can be
 // found in the LICENSE file.
 
-package main
+package xchacha20poly1305
 
 import (
 	"encoding/binary"
 	"golang.org/x/crypto/chacha20poly1305"
 )
 
-func HChaCha20(out *[32]byte, nonce []byte, key *[32]byte) {
+func hChaCha20(out *[32]byte, nonce []byte, key *[32]byte) {
 
 	v00 := uint32(0x61707865)
 	v01 := uint32(0x3320646e)
@@ -138,7 +138,7 @@ func HChaCha20(out *[32]byte, nonce []byte, key *[32]byte) {
 	binary.LittleEndian.PutUint32(out[28:], v15)
 }
 
-func XChaCha20Poly1305Encrypt(
+func Encrypt(
 	dst []byte,
 	nonceFull *[24]byte,
 	plaintext []byte,
@@ -147,13 +147,13 @@ func XChaCha20Poly1305Encrypt(
 ) []byte {
 	var nonce [chacha20poly1305.NonceSize]byte
 	var derivedKey [chacha20poly1305.KeySize]byte
-	HChaCha20(&derivedKey, nonceFull[:16], key)
+	hChaCha20(&derivedKey, nonceFull[:16], key)
 	aead, _ := chacha20poly1305.New(derivedKey[:])
 	copy(nonce[4:], nonceFull[16:])
 	return aead.Seal(dst, nonce[:], plaintext, additionalData)
 }
 
-func XChaCha20Poly1305Decrypt(
+func Decrypt(
 	dst []byte,
 	nonceFull *[24]byte,
 	plaintext []byte,
@@ -162,7 +162,7 @@ func XChaCha20Poly1305Decrypt(
 ) ([]byte, error) {
 	var nonce [chacha20poly1305.NonceSize]byte
 	var derivedKey [chacha20poly1305.KeySize]byte
-	HChaCha20(&derivedKey, nonceFull[:16], key)
+	hChaCha20(&derivedKey, nonceFull[:16], key)
 	aead, _ := chacha20poly1305.New(derivedKey[:])
 	copy(nonce[4:], nonceFull[16:])
 	return aead.Open(dst, nonce[:], plaintext, additionalData)

internal/xchacha20poly1305/xchacha20_test.go

@@ -1,4 +1,4 @@
-package main
+package xchacha20poly1305
 
 import (
 	"encoding/hex"
@@ -60,7 +60,7 @@ func TestXChaCha20(t *testing.T) {
 
 			// test encryption
 
-			ct := XChaCha20Poly1305Encrypt(
+			ct := Encrypt(
 				nil,
 				&nonceArray,
 				pt,
@@ -74,7 +74,7 @@ func TestXChaCha20(t *testing.T) {
 
 			// test decryption
 
-			ptp, err := XChaCha20Poly1305Decrypt(
+			ptp, err := Decrypt(
 				nil,
 				&nonceArray,
 				ct,

tun.go

@@ -1,14 +1,13 @@
 package main
 
 import (
+	"git.zx2c4.com/wireguard-go/internal/events"
 	"os"
 	"sync/atomic"
 )
 
 const DefaultMTU = 1420
 
-type TUNEvent int
-
 const (
 	TUNEventUp = 1 << iota
 	TUNEventDown
@@ -21,7 +20,7 @@ type TUNDevice interface {
 	Write([]byte, int) (int, error) // writes a packet to the device (without any additional headers)
 	MTU() (int, error)              // returns the MTU of the device
 	Name() string                   // returns the current name
-	Events() chan TUNEvent          // returns a constant channel of events related to the device
+	Events() chan events.Event      // returns a constant channel of events related to the device
 	Close() error                   // stops the device and closes the event channel
 }
 
@@ -30,7 +29,8 @@ func (device *Device) RoutineTUNEventReader() {
 	logError := device.log.Error
 
 	for event := range device.tun.device.Events() {
-		if event&TUNEventMTUUpdate != 0 {
+
+		if event.Contains(TUNEventMTUUpdate) {
 			mtu, err := device.tun.device.MTU()
 			old := atomic.LoadInt32(&device.tun.mtu)
 			if err != nil {
@@ -45,14 +45,16 @@ func (device *Device) RoutineTUNEventReader() {
 			}
 		}
 
-		if event&TUNEventUp != 0 && !device.isUp.Get() {
+		if event.Contains(TUNEventUp) && !device.isUp.Get() {
 			logInfo.Println("Interface set up")
 			device.Up()
 		}
 
-		if event&TUNEventDown != 0 && device.isUp.Get() {
+		if event.Contains(TUNEventDown) && device.isUp.Get() {
 			logInfo.Println("Interface set down")
 			device.Down()
 		}
+
+		event.Processed()
 	}
 }

tun_linux.go

@@ -7,6 +7,7 @@ import (
 	"encoding/binary"
 	"errors"
 	"fmt"
+	"git.zx2c4.com/wireguard-go/internal/events"
 	"golang.org/x/net/ipv6"
 	"golang.org/x/sys/unix"
 	"net"
@@ -52,10 +53,10 @@ const (
 
 type NativeTun struct {
 	fd     *os.File
-	index  int32         // if index
-	name   string        // name of interface
-	errors chan error    // async error handling
-	events chan TUNEvent // device related events
+	index  int32             // if index
+	name   string            // name of interface
+	errors chan error        // async error handling
+	events chan events.Event // device related events
 }
 
 func (tun *NativeTun) File() *os.File {
@@ -71,9 +72,9 @@ func (tun *NativeTun) RoutineHackListener() {
 		_, err := unix.Write(fd, nil)
 		switch err {
 		case unix.EINVAL:
-			tun.events <- TUNEventUp
+			tun.events <- events.NewEvent(TUNEventUp)
 		case unix.EIO:
-			tun.events <- TUNEventDown
+			tun.events <- events.NewEvent(TUNEventDown)
 		default:
 		}
 		time.Sleep(time.Second / 10)
@@ -118,14 +119,14 @@ func (tun *NativeTun) RoutineNetlinkListener() {
 				}
 
 				if info.Flags&unix.IFF_RUNNING != 0 {
-					tun.events <- TUNEventUp
+					tun.events <- events.NewEvent(TUNEventUp)
 				}
 
 				if info.Flags&unix.IFF_RUNNING == 0 {
-					tun.events <- TUNEventDown
+					tun.events <- events.NewEvent(TUNEventDown)
 				}
 
-				tun.events <- TUNEventMTUUpdate
+				tun.events <- events.NewEvent(TUNEventMTUUpdate)
 
 			default:
 				remain = remain[hdr.Len:]
@@ -288,7 +289,7 @@ func (tun *NativeTun) Read(buff []byte, offset int) (int, error) {
 	}
 }
 
-func (tun *NativeTun) Events() chan TUNEvent {
+func (tun *NativeTun) Events() chan events.Event {
 	return tun.events
 }
 
@@ -300,7 +301,7 @@ func CreateTUNFromFile(name string, fd *os.File) (TUNDevice, error) {
 	device := &NativeTun{
 		fd:     fd,
 		name:   name,
-		events: make(chan TUNEvent, 5),
+		events: make(chan events.Event, 5),
 		errors: make(chan error, 5),
 	}
 
@@ -357,7 +358,7 @@ func CreateTUN(name string) (TUNDevice, error) {
 	device := &NativeTun{
 		fd:     fd,
 		name:   newName,
-		events: make(chan TUNEvent, 5),
+		events: make(chan events.Event, 5),
 		errors: make(chan error, 5),
 	}