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Copyright (c) 2020 Tailscale & AUTHORS. All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above
copyright notice, this list of conditions and the following disclaimer
in the documentation and/or other materials provided with the
distribution.
* Neither the name of Tailscale Inc. nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

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# JNI
A JNI library cloned from github.com/tailscale/tailscale-android.

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__attribute__ ((visibility ("hidden"))) jint _jni_GetEnv(JavaVM *vm, JNIEnv **env, jint version);
__attribute__ ((visibility ("hidden"))) jint _jni_AttachCurrentThread(JavaVM *vm, JNIEnv **p_env, void *thr_args);
__attribute__ ((visibility ("hidden"))) jint _jni_DetachCurrentThread(JavaVM *vm);
__attribute__ ((visibility ("hidden"))) jclass _jni_FindClass(JNIEnv *env, const char *name);
__attribute__ ((visibility ("hidden"))) jthrowable _jni_ExceptionOccurred(JNIEnv *env);
__attribute__ ((visibility ("hidden"))) void _jni_ExceptionClear(JNIEnv *env);
__attribute__ ((visibility ("hidden"))) jclass _jni_GetObjectClass(JNIEnv *env, jobject obj);
__attribute__ ((visibility ("hidden"))) jmethodID _jni_GetMethodID(JNIEnv *env, jclass clazz, const char *name, const char *sig);
__attribute__ ((visibility ("hidden"))) jmethodID _jni_GetStaticMethodID(JNIEnv *env, jclass clazz, const char *name, const char *sig);
__attribute__ ((visibility ("hidden"))) jsize _jni_GetStringLength(JNIEnv *env, jstring str);
__attribute__ ((visibility ("hidden"))) const jchar *_jni_GetStringChars(JNIEnv *env, jstring str);
__attribute__ ((visibility ("hidden"))) jstring _jni_NewString(JNIEnv *env, const jchar *unicodeChars, jsize len);
__attribute__ ((visibility ("hidden"))) jboolean _jni_IsSameObject(JNIEnv *env, jobject ref1, jobject ref2);
__attribute__ ((visibility ("hidden"))) jobject _jni_NewGlobalRef(JNIEnv *env, jobject obj);
__attribute__ ((visibility ("hidden"))) void _jni_DeleteGlobalRef(JNIEnv *env, jobject obj);
__attribute__ ((visibility ("hidden"))) jint _jni_CallStaticIntMethodA(JNIEnv *env, jclass cls, jmethodID method, jvalue *args);
__attribute__ ((visibility ("hidden"))) jobject _jni_CallStaticObjectMethodA(JNIEnv *env, jclass cls, jmethodID method, jvalue *args);
__attribute__ ((visibility ("hidden"))) void _jni_CallStaticVoidMethodA(JNIEnv *env, jclass cls, jmethodID method, jvalue *args);
__attribute__ ((visibility ("hidden"))) jobject _jni_CallObjectMethodA(JNIEnv *env, jobject obj, jmethodID method, jvalue *args);
__attribute__ ((visibility ("hidden"))) jint _jni_CallIntMethodA(JNIEnv *env, jobject obj, jmethodID method, jvalue *args);
__attribute__ ((visibility ("hidden"))) void _jni_CallVoidMethodA(JNIEnv *env, jobject obj, jmethodID method, jvalue *args);
__attribute__ ((visibility ("hidden"))) jbyteArray _jni_NewByteArray(JNIEnv *env, jsize length);
__attribute__ ((visibility ("hidden"))) jbyte *_jni_GetByteArrayElements(JNIEnv *env, jbyteArray arr);
__attribute__ ((visibility ("hidden"))) void _jni_ReleaseByteArrayElements(JNIEnv *env, jbyteArray arr, jbyte *elems, jint mode);
__attribute__ ((visibility ("hidden"))) jsize _jni_GetArrayLength(JNIEnv *env, jarray arr);

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#include <jni.h>
jint _jni_AttachCurrentThread(JavaVM *vm, JNIEnv **p_env, void *thr_args) {
return (*vm)->AttachCurrentThread(vm, p_env, thr_args);
}
jint _jni_DetachCurrentThread(JavaVM *vm) {
return (*vm)->DetachCurrentThread(vm);
}
jint _jni_GetEnv(JavaVM *vm, JNIEnv **env, jint version) {
return (*vm)->GetEnv(vm, (void **)env, version);
}
jclass _jni_FindClass(JNIEnv *env, const char *name) {
return (*env)->FindClass(env, name);
}
jthrowable _jni_ExceptionOccurred(JNIEnv *env) {
return (*env)->ExceptionOccurred(env);
}
void _jni_ExceptionClear(JNIEnv *env) {
(*env)->ExceptionClear(env);
}
jclass _jni_GetObjectClass(JNIEnv *env, jobject obj) {
return (*env)->GetObjectClass(env, obj);
}
jmethodID _jni_GetMethodID(JNIEnv *env, jclass clazz, const char *name, const char *sig) {
return (*env)->GetMethodID(env, clazz, name, sig);
}
jmethodID _jni_GetStaticMethodID(JNIEnv *env, jclass clazz, const char *name, const char *sig) {
return (*env)->GetStaticMethodID(env, clazz, name, sig);
}
jsize _jni_GetStringLength(JNIEnv *env, jstring str) {
return (*env)->GetStringLength(env, str);
}
const jchar *_jni_GetStringChars(JNIEnv *env, jstring str) {
return (*env)->GetStringChars(env, str, NULL);
}
jstring _jni_NewString(JNIEnv *env, const jchar *unicodeChars, jsize len) {
return (*env)->NewString(env, unicodeChars, len);
}
jboolean _jni_IsSameObject(JNIEnv *env, jobject ref1, jobject ref2) {
return (*env)->IsSameObject(env, ref1, ref2);
}
jobject _jni_NewGlobalRef(JNIEnv *env, jobject obj) {
return (*env)->NewGlobalRef(env, obj);
}
void _jni_DeleteGlobalRef(JNIEnv *env, jobject obj) {
(*env)->DeleteGlobalRef(env, obj);
}
void _jni_CallStaticVoidMethodA(JNIEnv *env, jclass cls, jmethodID method, jvalue *args) {
(*env)->CallStaticVoidMethodA(env, cls, method, args);
}
jint _jni_CallStaticIntMethodA(JNIEnv *env, jclass cls, jmethodID method, jvalue *args) {
return (*env)->CallStaticIntMethodA(env, cls, method, args);
}
jobject _jni_CallStaticObjectMethodA(JNIEnv *env, jclass cls, jmethodID method, jvalue *args) {
return (*env)->CallStaticObjectMethodA(env, cls, method, args);
}
jobject _jni_CallObjectMethodA(JNIEnv *env, jobject obj, jmethodID method, jvalue *args) {
return (*env)->CallObjectMethodA(env, obj, method, args);
}
jint _jni_CallIntMethodA(JNIEnv *env, jobject obj, jmethodID method, jvalue *args) {
return (*env)->CallIntMethodA(env, obj, method, args);
}
void _jni_CallVoidMethodA(JNIEnv *env, jobject obj, jmethodID method, jvalue *args) {
(*env)->CallVoidMethodA(env, obj, method, args);
}
jbyteArray _jni_NewByteArray(JNIEnv *env, jsize length) {
return (*env)->NewByteArray(env, length);
}
jbyte *_jni_GetByteArrayElements(JNIEnv *env, jbyteArray arr) {
return (*env)->GetByteArrayElements(env, arr, NULL);
}
void _jni_ReleaseByteArrayElements(JNIEnv *env, jbyteArray arr, jbyte *elems, jint mode) {
(*env)->ReleaseByteArrayElements(env, arr, elems, mode);
}
jsize _jni_GetArrayLength(JNIEnv *env, jarray arr) {
return (*env)->GetArrayLength(env, arr);
}

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// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package jni
// Package jni implements various helper functions for communicating with the Android JVM
// though JNI.
import (
"errors"
"fmt"
"reflect"
"runtime"
"unicode/utf16"
"unsafe"
)
/*
#cgo CFLAGS: -Wall
#include <jni.h>
#include <stdlib.h>
#include "gojni.h"
*/
import "C"
type JVM struct {
jvm *C.JavaVM
}
type Env struct {
env *C.JNIEnv
}
type (
Class C.jclass
Object C.jobject
MethodID C.jmethodID
String C.jstring
ByteArray C.jbyteArray
Value uint64 // All JNI types fit into 64-bits.
)
func JVMFor(jvmPtr uintptr) JVM {
return JVM{
jvm: (*C.JavaVM)(unsafe.Pointer(jvmPtr)),
}
}
func EnvFor(envPtr uintptr) Env {
return Env{
env: (*C.JNIEnv)(unsafe.Pointer(envPtr)),
}
}
// Do invokes a function with a temporary JVM environment. The
// environment is not valid after the function returns.
func Do(vm JVM, f func(env Env) error) error {
runtime.LockOSThread()
defer runtime.UnlockOSThread()
var env *C.JNIEnv
if res := C._jni_GetEnv(vm.jvm, &env, C.JNI_VERSION_1_6); res != C.JNI_OK {
if res != C.JNI_EDETACHED {
panic(fmt.Errorf("JNI GetEnv failed with error %d", res))
}
if C._jni_AttachCurrentThread(vm.jvm, &env, nil) != C.JNI_OK {
panic(errors.New("runInJVM: AttachCurrentThread failed"))
}
defer C._jni_DetachCurrentThread(vm.jvm)
}
return f(Env{env})
}
func varArgs(args []Value) *C.jvalue {
if len(args) == 0 {
return nil
}
return (*C.jvalue)(unsafe.Pointer(&args[0]))
}
func IsSameObject(e Env, ref1, ref2 Object) bool {
same := C._jni_IsSameObject(e.env, C.jobject(ref1), C.jobject(ref2))
return same == C.JNI_TRUE
}
func CallStaticIntMethod(e Env, cls Class, method MethodID, args ...Value) (int, error) {
res := C._jni_CallStaticIntMethodA(e.env, C.jclass(cls), C.jmethodID(method), varArgs(args))
return int(res), exception(e)
}
func CallStaticVoidMethod(e Env, cls Class, method MethodID, args ...Value) error {
C._jni_CallStaticVoidMethodA(e.env, C.jclass(cls), C.jmethodID(method), varArgs(args))
return exception(e)
}
func CallVoidMethod(e Env, obj Object, method MethodID, args ...Value) error {
C._jni_CallVoidMethodA(e.env, C.jobject(obj), C.jmethodID(method), varArgs(args))
return exception(e)
}
func CallStaticObjectMethod(e Env, cls Class, method MethodID, args ...Value) (Object, error) {
res := C._jni_CallStaticObjectMethodA(e.env, C.jclass(cls), C.jmethodID(method), varArgs(args))
return Object(res), exception(e)
}
func CallObjectMethod(e Env, obj Object, method MethodID, args ...Value) (Object, error) {
res := C._jni_CallObjectMethodA(e.env, C.jobject(obj), C.jmethodID(method), varArgs(args))
return Object(res), exception(e)
}
func CallIntMethod(e Env, obj Object, method MethodID, args ...Value) (int32, error) {
res := C._jni_CallIntMethodA(e.env, C.jobject(obj), C.jmethodID(method), varArgs(args))
return int32(res), exception(e)
}
// GetByteArrayElements returns the contents of the array.
func GetByteArrayElements(e Env, jarr ByteArray) []byte {
size := C._jni_GetArrayLength(e.env, C.jarray(jarr))
elems := C._jni_GetByteArrayElements(e.env, C.jbyteArray(jarr))
defer C._jni_ReleaseByteArrayElements(e.env, C.jbyteArray(jarr), elems, 0)
backing := (*(*[1 << 30]byte)(unsafe.Pointer(elems)))[:size:size]
s := make([]byte, len(backing))
copy(s, backing)
return s
}
// NewByteArray allocates a Java byte array with the content. It
// panics if the allocation fails.
func NewByteArray(e Env, content []byte) ByteArray {
jarr := C._jni_NewByteArray(e.env, C.jsize(len(content)))
if jarr == 0 {
panic(fmt.Errorf("jni: NewByteArray(%d) failed", len(content)))
}
elems := C._jni_GetByteArrayElements(e.env, jarr)
defer C._jni_ReleaseByteArrayElements(e.env, jarr, elems, 0)
backing := (*(*[1 << 30]byte)(unsafe.Pointer(elems)))[:len(content):len(content)]
copy(backing, content)
return ByteArray(jarr)
}
// ClassLoader returns a reference to the Java ClassLoader associated
// with obj.
func ClassLoaderFor(e Env, obj Object) Object {
cls := GetObjectClass(e, obj)
getClassLoader := GetMethodID(e, cls, "getClassLoader", "()Ljava/lang/ClassLoader;")
clsLoader, err := CallObjectMethod(e, Object(obj), getClassLoader)
if err != nil {
// Class.getClassLoader should never fail.
panic(err)
}
return Object(clsLoader)
}
// LoadClass invokes the underlying ClassLoader's loadClass method and
// returns the class.
func LoadClass(e Env, loader Object, class string) (Class, error) {
cls := GetObjectClass(e, loader)
loadClass := GetMethodID(e, cls, "loadClass", "(Ljava/lang/String;)Ljava/lang/Class;")
name := JavaString(e, class)
loaded, err := CallObjectMethod(e, loader, loadClass, Value(name))
if err != nil {
return 0, err
}
return Class(loaded), exception(e)
}
// exception returns an error corresponding to the pending
// exception, and clears it. exceptionError returns nil if no
// exception is pending.
func exception(e Env) error {
thr := C._jni_ExceptionOccurred(e.env)
if thr == 0 {
return nil
}
C._jni_ExceptionClear(e.env)
cls := GetObjectClass(e, Object(thr))
toString := GetMethodID(e, cls, "toString", "()Ljava/lang/String;")
msg, err := CallObjectMethod(e, Object(thr), toString)
if err != nil {
return err
}
return errors.New(GoString(e, String(msg)))
}
// GetObjectClass returns the Java Class for an Object.
func GetObjectClass(e Env, obj Object) Class {
if obj == 0 {
panic("null object")
}
cls := C._jni_GetObjectClass(e.env, C.jobject(obj))
if err := exception(e); err != nil {
// GetObjectClass should never fail.
panic(err)
}
return Class(cls)
}
// GetStaticMethodID returns the id for a static method. It panics if the method
// wasn't found.
func GetStaticMethodID(e Env, cls Class, name, signature string) MethodID {
mname := C.CString(name)
defer C.free(unsafe.Pointer(mname))
msig := C.CString(signature)
defer C.free(unsafe.Pointer(msig))
m := C._jni_GetStaticMethodID(e.env, C.jclass(cls), mname, msig)
if err := exception(e); err != nil {
panic(err)
}
return MethodID(m)
}
// GetMethodID returns the id for a method. It panics if the method
// wasn't found.
func GetMethodID(e Env, cls Class, name, signature string) MethodID {
mname := C.CString(name)
defer C.free(unsafe.Pointer(mname))
msig := C.CString(signature)
defer C.free(unsafe.Pointer(msig))
m := C._jni_GetMethodID(e.env, C.jclass(cls), mname, msig)
if err := exception(e); err != nil {
panic(err)
}
return MethodID(m)
}
func NewGlobalRef(e Env, obj Object) Object {
return Object(C._jni_NewGlobalRef(e.env, C.jobject(obj)))
}
func DeleteGlobalRef(e Env, obj Object) {
C._jni_DeleteGlobalRef(e.env, C.jobject(obj))
}
// JavaString converts the string to a JVM jstring.
func JavaString(e Env, str string) String {
if str == "" {
return 0
}
utf16Chars := utf16.Encode([]rune(str))
res := C._jni_NewString(e.env, (*C.jchar)(unsafe.Pointer(&utf16Chars[0])), C.int(len(utf16Chars)))
return String(res)
}
// GoString converts the JVM jstring to a Go string.
func GoString(e Env, str String) string {
if str == 0 {
return ""
}
strlen := C._jni_GetStringLength(e.env, C.jstring(str))
chars := C._jni_GetStringChars(e.env, C.jstring(str))
var utf16Chars []uint16
hdr := (*reflect.SliceHeader)(unsafe.Pointer(&utf16Chars))
hdr.Data = uintptr(unsafe.Pointer(chars))
hdr.Cap = int(strlen)
hdr.Len = int(strlen)
utf8 := utf16.Decode(utf16Chars)
return string(utf8)
}