Client: cross-platform app (tested on OSX and Android)
diff --git a/core/client/jni/jni_android.go b/core/client/jni/jni_android.go
new file mode 100644
index 0000000..24f8ed4
--- /dev/null
+++ b/core/client/jni/jni_android.go
@@ -0,0 +1,489 @@
+// 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 implements various helper functions for communicating with the Android JVM
+// though JNI.
+package jni
+
+import (
+ "errors"
+ "fmt"
+ "reflect"
+ "runtime"
+ "sync"
+ "unicode/utf16"
+ "unsafe"
+)
+
+/*
+#cgo CFLAGS: -Wall
+
+#include <jni.h>
+#include <stdlib.h>
+
+static jint jni_AttachCurrentThread(JavaVM *vm, JNIEnv **p_env, void *thr_args) {
+ return (*vm)->AttachCurrentThread(vm, p_env, thr_args);
+}
+
+static jint jni_DetachCurrentThread(JavaVM *vm) {
+ return (*vm)->DetachCurrentThread(vm);
+}
+
+static jint jni_GetEnv(JavaVM *vm, JNIEnv **env, jint version) {
+ return (*vm)->GetEnv(vm, (void **)env, version);
+}
+
+static jclass jni_FindClass(JNIEnv *env, const char *name) {
+ return (*env)->FindClass(env, name);
+}
+
+static jthrowable jni_ExceptionOccurred(JNIEnv *env) {
+ return (*env)->ExceptionOccurred(env);
+}
+
+static void jni_ExceptionClear(JNIEnv *env) {
+ (*env)->ExceptionClear(env);
+}
+
+static jclass jni_GetObjectClass(JNIEnv *env, jobject obj) {
+ return (*env)->GetObjectClass(env, obj);
+}
+
+static jmethodID jni_GetMethodID(JNIEnv *env, jclass clazz, const char *name, const char *sig) {
+ return (*env)->GetMethodID(env, clazz, name, sig);
+}
+
+static jmethodID jni_GetStaticMethodID(JNIEnv *env, jclass clazz, const char *name, const char *sig) {
+ return (*env)->GetStaticMethodID(env, clazz, name, sig);
+}
+
+static jsize jni_GetStringLength(JNIEnv *env, jstring str) {
+ return (*env)->GetStringLength(env, str);
+}
+
+static const jchar *jni_GetStringChars(JNIEnv *env, jstring str) {
+ return (*env)->GetStringChars(env, str, NULL);
+}
+
+static jstring jni_NewString(JNIEnv *env, const jchar *unicodeChars, jsize len) {
+ return (*env)->NewString(env, unicodeChars, len);
+}
+
+static jboolean jni_IsSameObject(JNIEnv *env, jobject ref1, jobject ref2) {
+ return (*env)->IsSameObject(env, ref1, ref2);
+}
+
+static jobject jni_NewGlobalRef(JNIEnv *env, jobject obj) {
+ return (*env)->NewGlobalRef(env, obj);
+}
+
+static void jni_DeleteGlobalRef(JNIEnv *env, jobject obj) {
+ (*env)->DeleteGlobalRef(env, obj);
+}
+
+static void jni_CallStaticVoidMethodA(JNIEnv *env, jclass cls, jmethodID method, jvalue *args) {
+ (*env)->CallStaticVoidMethodA(env, cls, method, args);
+}
+
+static jint jni_CallStaticIntMethodA(JNIEnv *env, jclass cls, jmethodID method, jvalue *args) {
+ return (*env)->CallStaticIntMethodA(env, cls, method, args);
+}
+
+static jobject jni_CallStaticObjectMethodA(JNIEnv *env, jclass cls, jmethodID method, jvalue *args) {
+ return (*env)->CallStaticObjectMethodA(env, cls, method, args);
+}
+
+static jobject jni_CallObjectMethodA(JNIEnv *env, jobject obj, jmethodID method, jvalue *args) {
+ return (*env)->CallObjectMethodA(env, obj, method, args);
+}
+
+static jboolean jni_CallBooleanMethodA(JNIEnv *env, jobject obj, jmethodID method, jvalue *args) {
+ return (*env)->CallBooleanMethodA(env, obj, method, args);
+}
+
+static jint jni_CallIntMethodA(JNIEnv *env, jobject obj, jmethodID method, jvalue *args) {
+ return (*env)->CallIntMethodA(env, obj, method, args);
+}
+
+static void jni_CallVoidMethodA(JNIEnv *env, jobject obj, jmethodID method, jvalue *args) {
+ (*env)->CallVoidMethodA(env, obj, method, args);
+}
+
+static jbyteArray jni_NewByteArray(JNIEnv *env, jsize length) {
+ return (*env)->NewByteArray(env, length);
+}
+
+static jboolean *jni_GetBooleanArrayElements(JNIEnv *env, jbooleanArray arr) {
+ return (*env)->GetBooleanArrayElements(env, arr, NULL);
+}
+
+static void jni_ReleaseBooleanArrayElements(JNIEnv *env, jbooleanArray arr, jboolean *elems, jint mode) {
+ (*env)->ReleaseBooleanArrayElements(env, arr, elems, mode);
+}
+
+static jbyte *jni_GetByteArrayElements(JNIEnv *env, jbyteArray arr) {
+ return (*env)->GetByteArrayElements(env, arr, NULL);
+}
+
+static jint *jni_GetIntArrayElements(JNIEnv *env, jintArray arr) {
+ return (*env)->GetIntArrayElements(env, arr, NULL);
+}
+
+static void jni_ReleaseIntArrayElements(JNIEnv *env, jintArray arr, jint *elems, jint mode) {
+ (*env)->ReleaseIntArrayElements(env, arr, elems, mode);
+}
+
+static jlong *jni_GetLongArrayElements(JNIEnv *env, jlongArray arr) {
+ return (*env)->GetLongArrayElements(env, arr, NULL);
+}
+
+static void jni_ReleaseLongArrayElements(JNIEnv *env, jlongArray arr, jlong *elems, jint mode) {
+ (*env)->ReleaseLongArrayElements(env, arr, elems, mode);
+}
+
+static void jni_ReleaseByteArrayElements(JNIEnv *env, jbyteArray arr, jbyte *elems, jint mode) {
+ (*env)->ReleaseByteArrayElements(env, arr, elems, mode);
+}
+
+static jsize jni_GetArrayLength(JNIEnv *env, jarray arr) {
+ return (*env)->GetArrayLength(env, arr);
+}
+
+static void jni_DeleteLocalRef(JNIEnv *env, jobject localRef) {
+ return (*env)->DeleteLocalRef(env, localRef);
+}
+
+static jobject jni_GetObjectArrayElement(JNIEnv *env, jobjectArray array, jsize index) {
+ return (*env)->GetObjectArrayElement(env, array, index);
+}
+
+static jboolean jni_IsInstanceOf(JNIEnv *env, jobject obj, jclass clazz) {
+ return (*env)->IsInstanceOf(env, obj, clazz);
+}
+*/
+import "C"
+
+type JVM C.JavaVM
+
+type Env C.JNIEnv
+
+type (
+ Class C.jclass
+ Object C.jobject
+ MethodID C.jmethodID
+ String C.jstring
+ ByteArray C.jbyteArray
+ ObjectArray C.jobjectArray
+ BooleanArray C.jbooleanArray
+ LongArray C.jlongArray
+ IntArray C.jintArray
+ Boolean C.jboolean
+ Value uint64 // All JNI types fit into 64-bits.
+)
+
+// Cached class handles.
+var classes struct {
+ once sync.Once
+ stringClass, integerClass Class
+
+ integerIntValue MethodID
+}
+
+func env(e *Env) *C.JNIEnv {
+ return (*C.JNIEnv)(unsafe.Pointer(e))
+}
+
+func javavm(vm *JVM) *C.JavaVM {
+ return (*C.JavaVM)(unsafe.Pointer(vm))
+}
+
+// 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(javavm(vm), &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(javavm(vm), &env, nil) != C.JNI_OK {
+ panic(errors.New("runInJVM: AttachCurrentThread failed"))
+ }
+ defer C.jni_DetachCurrentThread(javavm(vm))
+ }
+
+ return f((*Env)(unsafe.Pointer(env)))
+}
+
+func Bool(b bool) Boolean {
+ if b {
+ return C.JNI_TRUE
+ }
+ return C.JNI_FALSE
+}
+
+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(env(e), 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(env(e), 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(env(e), 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(env(e), 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(env(e), 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(env(e), C.jobject(obj), C.jmethodID(method), varArgs(args))
+ return Object(res), exception(e)
+}
+
+func CallBooleanMethod(e *Env, obj Object, method MethodID, args ...Value) (bool, error) {
+ res := C.jni_CallBooleanMethodA(env(e), C.jobject(obj), C.jmethodID(method), varArgs(args))
+ return res == C.JNI_TRUE, exception(e)
+}
+
+func CallIntMethod(e *Env, obj Object, method MethodID, args ...Value) (int32, error) {
+ res := C.jni_CallIntMethodA(env(e), C.jobject(obj), C.jmethodID(method), varArgs(args))
+ return int32(res), exception(e)
+}
+
+// GetByteArrayElements returns the contents of the byte array.
+func GetByteArrayElements(e *Env, jarr ByteArray) []byte {
+ if jarr == 0 {
+ return nil
+ }
+ size := C.jni_GetArrayLength(env(e), C.jarray(jarr))
+ elems := C.jni_GetByteArrayElements(env(e), C.jbyteArray(jarr))
+ defer C.jni_ReleaseByteArrayElements(env(e), C.jbyteArray(jarr), elems, 0)
+ backing := (*(*[1 << 30]byte)(unsafe.Pointer(elems)))[:size:size]
+ s := make([]byte, len(backing))
+ copy(s, backing)
+ return s
+}
+
+// GetBooleanArrayElements returns the contents of the boolean array.
+func GetBooleanArrayElements(e *Env, jarr BooleanArray) []bool {
+ if jarr == 0 {
+ return nil
+ }
+ size := C.jni_GetArrayLength(env(e), C.jarray(jarr))
+ elems := C.jni_GetBooleanArrayElements(env(e), C.jbooleanArray(jarr))
+ defer C.jni_ReleaseBooleanArrayElements(env(e), C.jbooleanArray(jarr), elems, 0)
+ backing := (*(*[1 << 30]C.jboolean)(unsafe.Pointer(elems)))[:size:size]
+ r := make([]bool, len(backing))
+ for i, b := range backing {
+ r[i] = b == C.JNI_TRUE
+ }
+ return r
+}
+
+// GetStringArrayElements returns the contents of the String array.
+func GetStringArrayElements(e *Env, jarr ObjectArray) []string {
+ var strings []string
+ iterateObjectArray(e, jarr, func(e *Env, idx int, item Object) {
+ s := GoString(e, String(item))
+ strings = append(strings, s)
+ })
+ return strings
+}
+
+// GetIntArrayElements returns the contents of the int array.
+func GetIntArrayElements(e *Env, jarr IntArray) []int {
+ if jarr == 0 {
+ return nil
+ }
+ size := C.jni_GetArrayLength(env(e), C.jarray(jarr))
+ elems := C.jni_GetIntArrayElements(env(e), C.jintArray(jarr))
+ defer C.jni_ReleaseIntArrayElements(env(e), C.jintArray(jarr), elems, 0)
+ backing := (*(*[1 << 27]C.jint)(unsafe.Pointer(elems)))[:size:size]
+ r := make([]int, len(backing))
+ for i, l := range backing {
+ r[i] = int(l)
+ }
+ return r
+}
+
+// GetLongArrayElements returns the contents of the long array.
+func GetLongArrayElements(e *Env, jarr LongArray) []int64 {
+ if jarr == 0 {
+ return nil
+ }
+ size := C.jni_GetArrayLength(env(e), C.jarray(jarr))
+ elems := C.jni_GetLongArrayElements(env(e), C.jlongArray(jarr))
+ defer C.jni_ReleaseLongArrayElements(env(e), C.jlongArray(jarr), elems, 0)
+ backing := (*(*[1 << 27]C.jlong)(unsafe.Pointer(elems)))[:size:size]
+ r := make([]int64, len(backing))
+ for i, l := range backing {
+ r[i] = int64(l)
+ }
+ return r
+}
+
+func iterateObjectArray(e *Env, jarr ObjectArray, f func(e *Env, idx int, item Object)) {
+ if jarr == 0 {
+ return
+ }
+ size := C.jni_GetArrayLength(env(e), C.jarray(jarr))
+ for i := 0; i < int(size); i++ {
+ item := C.jni_GetObjectArrayElement(env(e), C.jobjectArray(jarr), C.jint(i))
+ f(e, i, Object(item))
+ C.jni_DeleteLocalRef(env(e), item)
+ }
+}
+
+// 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(env(e), C.jsize(len(content)))
+ if jarr == 0 {
+ panic(fmt.Errorf("jni: NewByteArray(%d) failed", len(content)))
+ }
+ elems := C.jni_GetByteArrayElements(env(e), jarr)
+ defer C.jni_ReleaseByteArrayElements(env(e), 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(env(e))
+ if thr == 0 {
+ return nil
+ }
+ C.jni_ExceptionClear(env(e))
+ 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(env(e), 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(env(e), 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(env(e), 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(env(e), C.jobject(obj)))
+}
+
+func DeleteGlobalRef(e *Env, obj Object) {
+ C.jni_DeleteGlobalRef(env(e), 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(env(e), (*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(env(e), C.jstring(str))
+ chars := C.jni_GetStringChars(env(e), 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)
+}