libwg-go: use gopath

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

app/tools/libwg-go/.gitignore

@@ -1,7 +1,2 @@
-go/
-*.go
-libwg-go.h
-jni.o
-gopath/
-goroot/
+src/
 .gobuildversion

app/tools/libwg-go/Makefile

@@ -11,7 +11,6 @@ NDK_GO_ARCH_MAP_arm64 := arm64
 NDK_GO_ARCH_MAP_mips := mipsx
 NDK_GO_ARCH_MAP_mips64 := mips64x
 
-export GOPATH := $(CURDIR)/gopath
 CLANG_FLAGS := --target=$(ANDROID_LLVM_TRIPLE) --gcc-toolchain=$(ANDROID_TOOLCHAIN_ROOT) --sysroot=$(ANDROID_SYSROOT)
 export CGO_CFLAGS := $(CLANG_FLAGS) $(CFLAGS)
 export CGO_LDFLAGS := $(CLANG_FLAGS) $(LDFLAGS)
@@ -48,12 +47,12 @@ endif
 
 $(shell test "$$(cat .gobuildversion 2>/dev/null)" = "$(GOBUILDVERSION_CURRENT)" || rm -f "$(DESTDIR)/libwg-go.so")
 
-$(DESTDIR)/libwg-go.so: $(FILES) api-android.go jni.c
+$(DESTDIR)/libwg-go.so: $(FILES) src/git.zx2c4.com/wireguard-go/api-android.go src/git.zx2c4.com/wireguard-go/tun/api-android.go src/git.zx2c4.com/wireguard-go/jni.c
 	find . -name '*.go' -type l -delete
 	find . -type d -empty -delete
-	mkdir -p $(subst ../wireguard-go/,./,$(dir $(FILES)))
-	$(foreach FILE,$(FILES),ln -sfrt $(subst ../wireguard-go/,./,$(dir $(FILE))) $(FILE);)
+	mkdir -p $(subst ../wireguard-go/,./src/git.zx2c4.com/wireguard-go/,$(dir $(FILES)))
+	$(foreach FILE,$(FILES),ln -sfrt $(subst ../wireguard-go/,./src/git.zx2c4.com/wireguard-go/,$(dir $(FILE))) $(FILE);)
 	patch -p1 -f -R -s --dry-run -d"$$(go env GOROOT)" < goruntime-boottime-over-monotonic.diff
-	go get -v -d
-	go build -v -o $(DESTDIR)/libwg-go.so -buildmode c-shared
+	GOPATH=$(PWD) go get -v -d git.zx2c4.com/wireguard-go
+	GOPATH=$(PWD) go build -v -o $(DESTDIR)/libwg-go.so -buildmode c-shared git.zx2c4.com/wireguard-go
 	go version > .gobuildversion

app/tools/libwg-go/src/git.zx2c4.com/wireguard-go/api-android.go

@@ -10,8 +10,8 @@ package main
 import "C"
 
 import (
-	"./rwcancel"
 	"bufio"
+	"git.zx2c4.com/wireguard-go/tun"
 	"golang.org/x/sys/unix"
 	"io/ioutil"
 	"log"
@@ -64,28 +64,16 @@ func wgTurnOn(ifnameRef string, tun_fd int32, settings string) int32 {
 
 	logger.Debug.Println("Debug log enabled")
 
-	tun := &NativeTun{
-		fd:     os.NewFile(uintptr(tun_fd), "/dev/tun"),
-		events: make(chan TUNEvent, 5),
-		errors: make(chan error, 5),
-		nopi:   true,
+	tun, name, err := tun.CreateTUNFromFD(int(tun_fd))
+	if err != nil {
+		unix.Close(int(tun_fd))
+		logger.Error.Println(err)
+		return -1
 	}
-	var err error
 
-	tun.fdCancel, err = rwcancel.NewRWCancel(int(tun_fd))
-	if err != nil {
-		unix.Close(int(tun_fd))
-		logger.Error.Println(err)
-		return -1
-	}
-	name, err := tun.Name()
-	if err != nil {
-		unix.Close(int(tun_fd))
-		logger.Error.Println(err)
-		return -1
-	}
 	logger.Info.Println("Attaching to interface", name)
 	device := NewDevice(tun, logger)
+
 	logger.Debug.Println("Interface has MTU", device.tun.mtu)
 
 	bufferedSettings := bufio.NewReadWriter(bufio.NewReader(strings.NewReader(settings)), bufio.NewWriter(ioutil.Discard))

app/tools/libwg-go/src/git.zx2c4.com/wireguard-go/tun/api-android.go

@@ -0,0 +1,31 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later
+ *
+ * Copyright (C) 2017-2018 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
+ */
+
+package tun
+
+import (
+	"git.zx2c4.com/wireguard-go/rwcancel"
+	"os"
+)
+
+func CreateTUNFromFD(tun_fd int) (TUNDevice, string, error) {
+	tun := &nativeTun{
+		fd:     os.NewFile(uintptr(tun_fd), "/dev/tun"),
+		events: make(chan TUNEvent, 5),
+		errors: make(chan error, 5),
+		nopi:   true,
+	}
+	var err error
+	tun.fdCancel, err = rwcancel.NewRWCancel(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

@@ -1 +1 @@
-Subproject commit d67d89c7f9d83d22d750452236b0e16510ab1368
+Subproject commit 6977826c2c9840f79dc2ac6b4206a5f393e9dfb4

app/tools/wireguard-go

@@ -1 +1 @@
-Subproject commit 65a74f3175855dc41b49332103ada6bb27733291
+Subproject commit 0b647d1ca7e079f3bb2fe95c3ca7c05898315a6e