Initial: initial commit

core/src/main/golang/tun.go

@@ -0,0 +1,83 @@
+package main
+
+//#include "bridge.h"
+import "C"
+
+import (
+	"context"
+	"unsafe"
+
+	"cfa/app"
+	"cfa/tun"
+
+	"golang.org/x/sync/semaphore"
+
+	"github.com/Dreamacro/clash/log"
+)
+
+type remoteTun struct {
+	callback unsafe.Pointer
+
+	closed bool
+	limit  *semaphore.Weighted
+}
+
+func (t *remoteTun) markSocket(fd int) {
+	_ = t.limit.Acquire(context.Background(), 1)
+	defer t.limit.Release(1)
+
+	if t.closed {
+		return
+	}
+
+	C.mark_socket(t.callback, C.int(fd))
+}
+
+func (t *remoteTun) querySocketUid(protocol int, source, target string) int {
+	_ = t.limit.Acquire(context.Background(), 1)
+	defer t.limit.Release(1)
+
+	if t.closed {
+		return -1
+	}
+
+	return int(C.query_socket_uid(t.callback, C.int(protocol), C.CString(source), C.CString(target)))
+}
+
+func (t *remoteTun) stop() {
+	_ = t.limit.Acquire(context.Background(), 4)
+	defer t.limit.Release(4)
+
+	t.closed = true
+
+	C.release_object(t.callback)
+
+	log.Infoln("Android tun device destroyed")
+}
+
+//export startTun
+func startTun(fd, mtu C.int, gateway, mirror, dns C.c_string, callback unsafe.Pointer) C.int {
+	f := int(fd)
+	m := int(mtu)
+
+	g := C.GoString(gateway)
+	mr := C.GoString(mirror)
+	d := C.GoString(dns)
+
+	remote := &remoteTun{callback: callback, closed: false, limit: semaphore.NewWeighted(4)}
+
+	if tun.Start(f, m, g, mr, d, remote.stop) != nil {
+		return 1
+	}
+
+	app.ApplyTunContext(remote.markSocket, remote.querySocketUid)
+
+	log.Infoln("Android tun device created")
+
+	return 0
+}
+
+//export stopTun
+func stopTun() {
+	tun.Stop()
+}