First stab at Go bridge
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
This commit is contained in:
Jason A. Donenfeld
parent
f7cbe841b7
commit
831640312c
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[submodule "wireguard-go"]
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path = wireguard-go
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url = https://git.zx2c4.com/wireguard-go
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Subproject commit 0ba551807fcd0d33c6ad80842b71c8de42c2da55
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# SPDX-License-Identifier: GPL-2.0
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#
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# Copyright (C) 2018 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
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FILES := $(filter-out %/main.go,$(wildcard ../wireguard-go/*/*.go) $(wildcard ../wireguard-go/*.go))
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# CLANG_FLAGS := --target=$(ANDROID_LLVM_TRIPLE) --gcc-toolchain=$(ANDROID_TOOLCHAIN_ROOT) --sysroot=$(ANDROID_SYSROOT)
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# export CGO_CFLAGS := $(CLANG_FLAGS) $(CFLAGS)
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# export CGO_LDFLAGS := $(CLANG_FLAGS) $(LDFLAGS)
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# export CC := $(ANDROID_C_COMPILER)
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# export GOARCH := $(NDK_GO_ARCH_MAP_$(ANDROID_ARCH_NAME))
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export GOOS := darwin
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export CGO_ENABLED := 1
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default: example
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libwg-go.so: $(FILES) src/git.zx2c4.com/wireguard-go/api-ios.go src/git.zx2c4.com/wireguard-go/tun/tun_ios.go
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find . -name '*.go' -type l -delete
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find . -type d -empty -delete
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mkdir -p $(subst ../wireguard-go/,./src/git.zx2c4.com/wireguard-go/,$(dir $(FILES)))
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$(foreach FILE,$(FILES),ln -sf $(abspath $(FILE)) $(subst ../wireguard-go/,./src/git.zx2c4.com/wireguard-go/,$(dir $(FILE)))$(file $(FILE));)
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GOPATH=$(PWD) go get -v -d git.zx2c4.com/wireguard-go
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GOPATH=$(PWD) go build -tags ios -v -o libwg-go.so -buildmode c-shared git.zx2c4.com/wireguard-go
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@rm -f libwg-go.h
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example: example.c libwg-go.so
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$(CC) -L. -lwg-go -o example example.c
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clean:
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rm -f libwg-go.so test
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.PHONY: clean default
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/* SPDX-License-Identifier: GPL-2.0
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*
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* Copyright (C) 2018 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
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*/
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#include "wireguard.h"
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#include <stdio.h>
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#include <stdbool.h>
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#include <unistd.h>
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static struct {
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int something;
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} ctx;
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static bool is_closed = false;
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ssize_t do_read(const void *ctx, const unsigned char *buf, size_t len)
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{
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printf("Reading from instance with ctx %p into buffer %p of length %zu\n", ctx, buf, len);
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sleep(1);
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return is_closed ? -1 : 0;
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}
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ssize_t do_write(const void *ctx, const unsigned char *buf, size_t len)
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{
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printf("Writing from instance with ctx %p into buffer %p of length %zu\n", ctx, buf, len);
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return len;
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}
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void do_log(int level, const char *tag, const char *msg)
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{
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printf("Log level %d for %s: %s", level, tag, msg);
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}
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int main(int argc, char *argv[])
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{
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int handle;
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printf("WireGuard Go Version %s\n", wgVersion());
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wgSetLogger(do_log);
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handle = wgTurnOn((gostring_t){ .p = "test", .n = 4 }, (gostring_t){ .p = "", .n = 0 }, do_read, do_write, &ctx);
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sleep(5);
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is_closed = true;
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wgTurnOff(handle);
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return 0;
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}
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/* SPDX-License-Identifier: GPL-2.0
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*
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* Copyright (C) 2018 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
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*/
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package main
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// #include <sys/types.h>
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// static void callLogger(void *func, int level, const char *tag, const char *msg)
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// {
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// ((void(*)(int, const char *, const char *))func)(level, tag, msg);
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// }
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import "C"
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import (
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"bufio"
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"git.zx2c4.com/wireguard-go/tun"
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"golang.org/x/sys/unix"
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"io/ioutil"
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"log"
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"math"
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"os"
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"os/signal"
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"runtime"
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"strings"
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"unsafe"
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"errors"
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)
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var loggerFunc unsafe.Pointer
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type CLogger struct {
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level C.int
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interfaceName string
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}
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func (l *CLogger) Write(p []byte) (int, error) {
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if uintptr(loggerFunc) == 0 {
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return 0, errors.New("No logger initialized")
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}
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C.callLogger(loggerFunc, l.level, C.CString("WireGuard/GoBackend/"+l.interfaceName), C.CString(string(p)))
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return len(p), nil
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}
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var tunnelHandles map[int32]*Device
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func init() {
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roamingDisabled = true
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tunnelHandles = make(map[int32]*Device)
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signals := make(chan os.Signal)
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signal.Notify(signals, unix.SIGUSR2)
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go func() {
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buf := make([]byte, os.Getpagesize())
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for {
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select {
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case <-signals:
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n := runtime.Stack(buf, true)
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buf[n] = 0
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if uintptr(loggerFunc) != 0 {
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C.callLogger(loggerFunc, 0, C.CString("WireGuard/GoBackend/Stacktrace"), (*_Ctype_char)(unsafe.Pointer(&buf[0])))
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}
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}
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}
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}()
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}
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//export wgSetLogger
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func wgSetLogger(loggerFn uintptr) {
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loggerFunc = unsafe.Pointer(loggerFn)
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}
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//export wgTurnOn
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func wgTurnOn(ifnameRef string, settings string, readFn uintptr, writeFn uintptr, ctx uintptr) int32 {
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interfaceName := string([]byte(ifnameRef))
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logger := &Logger{
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Debug: log.New(&CLogger{level: 0, interfaceName: interfaceName}, "", 0),
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Info: log.New(&CLogger{level: 1, interfaceName: interfaceName}, "", 0),
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Error: log.New(&CLogger{level: 2, interfaceName: interfaceName}, "", 0),
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}
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logger.Debug.Println("Debug log enabled")
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tun := tun.CreateTUN(1280, unsafe.Pointer(readFn), unsafe.Pointer(writeFn), unsafe.Pointer(ctx))
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logger.Info.Println("Attaching to interface")
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device := NewDevice(tun, logger)
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logger.Debug.Println("Interface has MTU", device.tun.mtu)
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bufferedSettings := bufio.NewReadWriter(bufio.NewReader(strings.NewReader(settings)), bufio.NewWriter(ioutil.Discard))
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setError := ipcSetOperation(device, bufferedSettings)
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if setError != nil {
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logger.Error.Println(setError)
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return -1
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}
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device.Up()
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logger.Info.Println("Device started")
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var i int32
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for i = 0; i < math.MaxInt32; i++ {
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if _, exists := tunnelHandles[i]; !exists {
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break
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}
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}
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if i == math.MaxInt32 {
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return -1
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}
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tunnelHandles[i] = device
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return i
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}
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//export wgTurnOff
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func wgTurnOff(tunnelHandle int32) {
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device, ok := tunnelHandles[tunnelHandle]
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if !ok {
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return
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}
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delete(tunnelHandles, tunnelHandle)
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device.Close()
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}
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//export wgVersion
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func wgVersion() *C.char {
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return C.CString(WireGuardGoVersion)
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}
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func main() {}
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/* SPDX-License-Identifier: GPL-2.0
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*
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* Copyright (C) 2018 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
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*/
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package tun
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// #include <sys/types.h>
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// static ssize_t callFnWithCtx(const void *func, const void *ctx, const void *buffer, size_t len)
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// {
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// return ((ssize_t(*)(const void *, const unsigned char *, size_t))func)(ctx, buffer, len);
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// }
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import "C"
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import (
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"os"
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"syscall"
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"unsafe"
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)
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type nativeTun struct {
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events chan TUNEvent
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mtu int
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readFn unsafe.Pointer
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writeFn unsafe.Pointer
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ctx unsafe.Pointer
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}
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func CreateTUN(mtu int, readFn unsafe.Pointer, writeFn unsafe.Pointer, ctx unsafe.Pointer) TUNDevice {
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tun := &nativeTun{
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events: make(chan TUNEvent, 10),
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mtu: mtu,
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readFn: readFn,
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writeFn: writeFn,
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ctx: ctx,
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}
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tun.events <- TUNEventUp
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return tun
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}
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func (tun *nativeTun) Name() (string, error) {
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return "tun", nil
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}
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func (tun *nativeTun) File() *os.File {
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return nil
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}
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func (tun *nativeTun) Events() chan TUNEvent {
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return tun.events
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}
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func (tun *nativeTun) Read(buff []byte, offset int) (int, error) {
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buff = buff[offset:]
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ret := C.callFnWithCtx(tun.readFn, tun.ctx, unsafe.Pointer(&buff[0]), C.size_t(len(buff)))
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if ret < 0 {
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return 0, syscall.Errno(-ret)
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}
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return int(ret), nil
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}
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func (tun *nativeTun) Write(buff []byte, offset int) (int, error) {
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buff = buff[offset:]
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ret := C.callFnWithCtx(tun.writeFn, tun.ctx, unsafe.Pointer(&buff[0]), C.size_t(len(buff)))
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if ret < 0 {
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return 0, syscall.Errno(-ret)
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}
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return int(ret), nil
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}
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func (tun *nativeTun) Close() error {
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if tun.events != nil {
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close(tun.events)
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}
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return nil
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}
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func (tun *nativeTun) setMTU(n int) error {
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tun.mtu = n
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return nil
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}
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func (tun *nativeTun) MTU() (int, error) {
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return tun.mtu, nil
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}
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/* SPDX-License-Identifier: GPL-2.0
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*
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* Copyright (C) 2018 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
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*/
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#ifndef WIREGUARD_H
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#define WIREGUARD_H
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#include <sys/types.h>
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typedef struct { const char *p; size_t n; } gostring_t;
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typedef ssize_t(*read_write_fn_t)(const void *ctx, const unsigned char *buf, size_t len);
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typedef void(*logger_fn_t)(int level, const char *tag, const char *msg);
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extern void wgSetLogger(logger_fn_t logger_fn);
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extern int wgTurnOn(gostring_t ifname, gostring_t settings, read_write_fn_t read_fn, read_write_fn_t write_fn, void *ctx);
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extern void wgTurnOff(int handle);
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extern char *wgVersion();
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#endif
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