libwg-go: don't use submodule

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

.gitmodules

@@ -4,6 +4,3 @@
 [submodule "app/tools/wireguard"]
 	path = app/tools/wireguard
 	url = https://git.zx2c4.com/WireGuard
-[submodule "app/tools/wireguard-go"]
-	path = app/tools/wireguard-go
-	url = https://git.zx2c4.com/wireguard-go

app/tools/libwg-go/.gitignore

@@ -1,2 +1 @@
-build/
+build/
-.gobuildversion

app/tools/libwg-go/Makefile

@@ -2,9 +2,6 @@
 #
 # Copyright © 2017-2019 WireGuard LLC. All Rights Reserved.
 
-UPSTREAM_FILES := $(filter-out %/main.go %/queueconstants.go,$(wildcard ../wireguard-go/*/*.go) $(wildcard ../wireguard-go/*.go)) ../wireguard-go/go.mod ../wireguard-go/go.sum
-DOWNSTREAM_FILES := $(wildcard src/*.go) $(wildcard src/*.c) $(wildcard src/*/*.go)
-
 BUILDDIR ?= $(CURDIR)/build
 DESTDIR ?= $(CURDIR)/out
 
@@ -43,23 +40,10 @@ $(GOROOT)/bin/go:
 	curl "$(GOBUILDTARBALL)" | tar -C "$(GOROOT)" --strip-components=1 -xzf - || { rm -rf "$(GOROOT)"; exit 1; }
 	patch -p1 -f -N -r- -d "$(GOROOT)" < goruntime-boottime-over-monotonic.diff || { rm -rf "$(GOROOT)"; exit 1; }
 
-$(shell test "$$(cat .gobuildversion 2>/dev/null)" = "$(GOBUILDVERSION_CURRENT)" || rm -f "$(DESTDIR)/libwg-go.so")
+$(shell test "$$(cat $(BUILDDIR)/.gobuildversion 2>/dev/null)" = "$(GOBUILDVERSION_CURRENT)" || rm -f "$(DESTDIR)/libwg-go.so")
 
-define copy-src-to-build
+$(DESTDIR)/libwg-go.so: $(GOROOT)/bin/go
-$(subst $(1),$(BUILDDIR)/,$(2)): $(2)
+	go get -tags linux || { chmod -fR +w "$(GOPATH)/pkg/mod"; rm -rf "$(GOPATH)/pkg/mod"; exit 1; }
-	@mkdir -vp "$$(dir $$@)"
-	@cp -vp "$$<" "$$@"
-$(BUILDDIR)/.prepared: $(subst $(1),$(BUILDDIR)/,$(2))
-endef
-
-$(foreach FILE,$(UPSTREAM_FILES),$(eval $(call copy-src-to-build,../wireguard-go/,$(FILE))))
-$(foreach FILE,$(DOWNSTREAM_FILES),$(eval $(call copy-src-to-build,src/,$(FILE))))
-
-$(BUILDDIR)/.prepared: $(GOROOT)/bin/go
-	cd "$(BUILDDIR)" && go get || { chmod -fR +w "$(GOPATH)/pkg/mod"; rm -rf "$(GOPATH)/pkg/mod"; exit 1; }
 	chmod -fR +w "$(GOPATH)/pkg/mod"
-	touch "$@"
+	go build -tags linux -ldflags="-X main.socketDirectory=/data/data/$(ANDROID_PACKAGE_NAME)/cache/wireguard" -v -o "$@" -buildmode c-shared
-
+	go version > $(BUILDDIR)/.gobuildversion
-$(DESTDIR)/libwg-go.so: $(BUILDDIR)/.prepared
-	cd "$(BUILDDIR)" && go build -ldflags="-X main.socketDirectory=/data/data/$(ANDROID_PACKAGE_NAME)/cache/wireguard" -v -o "$@" -buildmode c-shared
-	go version > .gobuildversion

app/tools/libwg-go/api-android.go

@@ -12,6 +12,8 @@ import "C"
 import (
 	"bufio"
 	"golang.org/x/sys/unix"
+	"golang.zx2c4.com/wireguard/device"
+	"golang.zx2c4.com/wireguard/ipc"
 	"golang.zx2c4.com/wireguard/tun"
 	"log"
 	"math"
@@ -34,14 +36,14 @@ func (l AndroidLogger) Write(p []byte) (int, error) {
 }
 
 type TunnelHandle struct {
-	device *Device
+	device *device.Device
 	uapi   net.Listener
 }
 
 var tunnelHandles map[int32]TunnelHandle
 
 func init() {
-	roamingDisabled = true
+	device.RoamingDisabled = true
 	tunnelHandles = make(map[int32]TunnelHandle)
 	signals := make(chan os.Signal)
 	signal.Notify(signals, unix.SIGUSR2)
@@ -62,7 +64,7 @@ func init() {
 func wgTurnOn(ifnameRef string, tunFd int32, settings string) int32 {
 	interfaceName := string([]byte(ifnameRef))
 
-	logger := &Logger{
+	logger := &device.Logger{
 		Debug: log.New(&AndroidLogger{level: C.ANDROID_LOG_DEBUG, interfaceName: interfaceName}, "", 0),
 		Info:  log.New(&AndroidLogger{level: C.ANDROID_LOG_INFO, interfaceName: interfaceName}, "", 0),
 		Error: log.New(&AndroidLogger{level: C.ANDROID_LOG_ERROR, interfaceName: interfaceName}, "", 0),
@@ -70,7 +72,7 @@ func wgTurnOn(ifnameRef string, tunFd int32, settings string) int32 {
 
 	logger.Debug.Println("Debug log enabled")
 
-	tun, name, err := tun.CreateTUNFromFD(int(tunFd))
+	tun, name, err := tun.CreateUnmonitoredTUNFromFD(int(tunFd))
 	if err != nil {
 		unix.Close(int(tunFd))
 		logger.Error.Println(err)
@@ -78,11 +80,9 @@ func wgTurnOn(ifnameRef string, tunFd int32, settings string) int32 {
 	}
 
 	logger.Info.Println("Attaching to interface", name)
-	device := NewDevice(tun, logger)
+	device := device.NewDevice(tun, logger)
 
-	logger.Debug.Println("Interface has MTU", device.tun.mtu)
+	setError := device.IpcSetOperation(bufio.NewReader(strings.NewReader(settings)))
-
-	setError := ipcSetOperation(device, bufio.NewReader(strings.NewReader(settings)))
 	if setError != nil {
 		unix.Close(int(tunFd))
 		logger.Error.Println(setError)
@@ -91,11 +91,11 @@ func wgTurnOn(ifnameRef string, tunFd int32, settings string) int32 {
 
 	var uapi net.Listener
 
-	uapiFile, err := UAPIOpen(name)
+	uapiFile, err := ipc.UAPIOpen(name)
 	if err != nil {
 		logger.Error.Println(err)
 	} else {
-		uapi, err = UAPIListen(name, uapiFile)
+		uapi, err = ipc.UAPIListen(name, uapiFile)
 		if err != nil {
 			uapiFile.Close()
 			logger.Error.Println(err)
@@ -106,7 +106,7 @@ func wgTurnOn(ifnameRef string, tunFd int32, settings string) int32 {
 					if err != nil {
 						return
 					}
-					go ipcHandle(device, conn)
+					go device.IpcHandle(conn)
 				}
 			}()
 		}
@@ -148,22 +148,11 @@ func wgGetSocketV4(tunnelHandle int32) int32 {
 	if !ok {
 		return -1
 	}
-	native, ok := handle.device.net.bind.(*NativeBind)
+	fd, err := handle.device.PeekLookAtSocketFd4()
-	if !ok {
-		return -1
-	}
-	fd := int32(-1)
-	conn, err := native.ipv4.SyscallConn()
 	if err != nil {
 		return -1
 	}
-	err = conn.Control(func(f uintptr) {
+	return int32(fd)
-		fd = int32(f)
-	})
-	if err != nil {
-		return -1
-	}
-	return fd
 }
 
 //export wgGetSocketV6
@@ -172,27 +161,16 @@ func wgGetSocketV6(tunnelHandle int32) int32 {
 	if !ok {
 		return -1
 	}
-	native, ok := handle.device.net.bind.(*NativeBind)
+	fd, err := handle.device.PeekLookAtSocketFd6()
-	if !ok {
-		return -1
-	}
-	fd := int32(-1)
-	conn, err := native.ipv6.SyscallConn()
 	if err != nil {
 		return -1
 	}
-	err = conn.Control(func(f uintptr) {
+	return int32(fd)
-		fd = int32(f)
-	})
-	if err != nil {
-		return -1
-	}
-	return fd
 }
 
 //export wgVersion
 func wgVersion() *C.char {
-	return C.CString(WireGuardGoVersion)
+	return C.CString(device.WireGuardGoVersion)
 }
 
 func main() {}

app/tools/libwg-go/go.mod

@@ -0,0 +1,8 @@
+module golang.zx2c4.com/wireguard/android
+
+go 1.12
+
+require (
+	golang.org/x/sys v0.0.0-20190302025703-b6889370fb10
+	golang.zx2c4.com/wireguard v0.0.0-20190303043202-244a98e380fa
+)

app/tools/libwg-go/go.sum

@@ -0,0 +1,11 @@
+github.com/Microsoft/go-winio v0.4.11/go.mod h1:VhR8bwka0BXejwEJY73c50VrPtXAaKcyvVC4A4RozmA=
+golang.org/x/crypto v0.0.0-20190228161510-8dd112bcdc25 h1:jsG6UpNLt9iAsb0S2AGW28DveNzzgmbXR+ENoPjUeIU=
+golang.org/x/crypto v0.0.0-20190228161510-8dd112bcdc25/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
+golang.org/x/net v0.0.0-20190301231341-16b79f2e4e95 h1:fY7Dsw114eJN4boqzVSbpVHO6rTdhq6/GnXeu+PKnzU=
+golang.org/x/net v0.0.0-20190301231341-16b79f2e4e95/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
+golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20190302025703-b6889370fb10 h1:xQJI9OEiErEQ++DoXOHqEpzsGMrAv2Q2jyCpi7DmfpQ=
+golang.org/x/sys v0.0.0-20190302025703-b6889370fb10/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.zx2c4.com/wireguard v0.0.0-20190303042013-27104279d88d/go.mod h1:Koyxt99ZAZcr8lJuisBNX9vnaqKVNGcITeWOI1Zkmsw=
+golang.zx2c4.com/wireguard v0.0.0-20190303043202-244a98e380fa h1:t/IV/5G9uPXXDoaOrk+Lx2VsFhbqWGYFE+GEl160Yzc=
+golang.zx2c4.com/wireguard v0.0.0-20190303043202-244a98e380fa/go.mod h1:Koyxt99ZAZcr8lJuisBNX9vnaqKVNGcITeWOI1Zkmsw=

app/tools/libwg-go/src/queueconstants.go

@@ -1,16 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0
- *
- * Copyright (C) 2017-2019 WireGuard LLC. All Rights Reserved.
- */
-
-package main
-
-/* Reduce memory consumption for Android */
-
-const (
-	QueueOutboundSize          = 1024
-	QueueInboundSize           = 1024
-	QueueHandshakeSize         = 1024
-	MaxSegmentSize             = 2200
-	PreallocatedBuffersPerPool = 4096
-)

app/tools/libwg-go/src/tun/api-android.go

@@ -1,33 +0,0 @@
-/* SPDX-License-Identifier: Apache-2.0
- *
- * Copyright (C) 2017-2019 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
- */
-
-package tun
-
-import (
-	"golang.zx2c4.com/wireguard/rwcancel"
-	"os"
-)
-
-func CreateTUNFromFD(tunFd int) (TUNDevice, string, error) {
-	file := os.NewFile(uintptr(tunFd), "/dev/tun")
-	tun := &nativeTun{
-		tunFile: file,
-		fd:      file.Fd(),
-		events:  make(chan TUNEvent, 5),
-		errors:  make(chan error, 5),
-		nopi:    true,
-	}
-	var err error
-	tun.fdCancel, err = rwcancel.NewRWCancel(int(tun.fd))
-	if err != nil {
-		return nil, "", err
-	}
-	name, err := tun.Name()
-	if err != nil {
-		tun.fdCancel.Cancel()
-		return nil, "", err
-	}
-	return tun, name, nil
-}

app/tools/wireguard-go

@@ -1 +0,0 @@
-Subproject commit 88ff67fb6f55456e46877b71aa5d33060468f95e