1 /*
2 * Copyright (C) 2019 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #define LOG_TAG "AdbDebuggingManager-JNI"
18
19 #define LOG_NDEBUG 0
20
21 #include <algorithm>
22 #include <condition_variable>
23 #include <mutex>
24 #include <optional>
25 #include <random>
26 #include <string>
27 #include <vector>
28
29 #include <adb/pairing/pairing_server.h>
30 #include <android-base/properties.h>
31 #include <utils/Log.h>
32
33 #include <nativehelper/JNIHelp.h>
34 #include "jni.h"
35
36 namespace android {
37
38 // ----------------------------------------------------------------------------
39 namespace {
40
41 template <class T, class N>
42 class JSmartWrapper {
43 public:
JSmartWrapper(JNIEnv * env,T * jData)44 JSmartWrapper(JNIEnv* env, T* jData) : mEnv(env), mJData(jData) {}
45
46 virtual ~JSmartWrapper() = default;
47
data() const48 const N* data() const { return mRawData; }
49
size() const50 jsize size() const { return mSize; }
51
52 protected:
53 N* mRawData = nullptr;
54 JNIEnv* mEnv = nullptr;
55 T* mJData = nullptr;
56 jsize mSize = 0;
57 }; // JSmartWrapper
58
59 class JStringUTFWrapper : public JSmartWrapper<jstring, const char> {
60 public:
JStringUTFWrapper(JNIEnv * env,jstring * str)61 explicit JStringUTFWrapper(JNIEnv* env, jstring* str) : JSmartWrapper(env, str) {
62 mRawData = env->GetStringUTFChars(*str, NULL);
63 mSize = env->GetStringUTFLength(*str);
64 }
65
~JStringUTFWrapper()66 virtual ~JStringUTFWrapper() {
67 if (data()) {
68 mEnv->ReleaseStringUTFChars(*mJData, mRawData);
69 }
70 }
71 }; // JStringUTFWrapper
72
73 struct ServerDeleter {
operator ()android::__anon6847251b0110::ServerDeleter74 void operator()(PairingServerCtx* p) { pairing_server_destroy(p); }
75 };
76 using PairingServerPtr = std::unique_ptr<PairingServerCtx, ServerDeleter>;
77 struct PairingResultWaiter {
78 std::mutex mutex_;
79 std::condition_variable cv_;
80 std::optional<bool> is_valid_;
81 PeerInfo peer_info_;
82
ResultCallbackandroid::__anon6847251b0110::PairingResultWaiter83 static void ResultCallback(const PeerInfo* peer_info, void* opaque) {
84 auto* p = reinterpret_cast<PairingResultWaiter*>(opaque);
85 {
86 std::unique_lock<std::mutex> lock(p->mutex_);
87 if (peer_info) {
88 memcpy(&(p->peer_info_), peer_info, sizeof(PeerInfo));
89 }
90 p->is_valid_ = (peer_info != nullptr);
91 }
92 p->cv_.notify_one();
93 }
94 };
95
96 PairingServerPtr sServer;
97 std::unique_ptr<PairingResultWaiter> sWaiter;
98 } // namespace
99
native_pairing_start(JNIEnv * env,jobject thiz,jstring guid,jstring password)100 static jint native_pairing_start(JNIEnv* env, jobject thiz, jstring guid, jstring password) {
101 // Server-side only sends its GUID on success.
102 PeerInfo system_info = {};
103 system_info.type = ADB_DEVICE_GUID;
104 JStringUTFWrapper guidWrapper(env, &guid);
105 memcpy(system_info.data, guidWrapper.data(), guidWrapper.size());
106
107 JStringUTFWrapper passwordWrapper(env, &password);
108
109 // Create the pairing server
110 sServer = PairingServerPtr(
111 pairing_server_new_no_cert(reinterpret_cast<const uint8_t*>(passwordWrapper.data()),
112 passwordWrapper.size(), &system_info, 0));
113
114 sWaiter.reset(new PairingResultWaiter);
115 uint16_t port = pairing_server_start(sServer.get(), sWaiter->ResultCallback, sWaiter.get());
116 if (port == 0) {
117 ALOGE("Failed to start pairing server");
118 return -1;
119 }
120
121 return port;
122 }
123
native_pairing_cancel(JNIEnv *,jclass)124 static void native_pairing_cancel(JNIEnv* /* env */, jclass /* clazz */) {
125 if (sServer != nullptr) {
126 sServer.reset();
127 }
128 }
129
native_pairing_wait(JNIEnv * env,jobject thiz)130 static jboolean native_pairing_wait(JNIEnv* env, jobject thiz) {
131 ALOGI("Waiting for pairing server to complete");
132 std::unique_lock<std::mutex> lock(sWaiter->mutex_);
133 if (!sWaiter->is_valid_.has_value()) {
134 sWaiter->cv_.wait(lock, [&]() { return sWaiter->is_valid_.has_value(); });
135 }
136 if (!*(sWaiter->is_valid_)) {
137 return JNI_FALSE;
138 }
139
140 std::string peer_public_key = reinterpret_cast<char*>(sWaiter->peer_info_.data);
141 // Write to PairingThread's member variables
142 jclass clazz = env->GetObjectClass(thiz);
143 jfieldID mPublicKey = env->GetFieldID(clazz, "mPublicKey", "Ljava/lang/String;");
144 jstring jpublickey = env->NewStringUTF(peer_public_key.c_str());
145 env->SetObjectField(thiz, mPublicKey, jpublickey);
146 return JNI_TRUE;
147 }
148
149 // ----------------------------------------------------------------------------
150
151 static const JNINativeMethod gPairingThreadMethods[] = {
152 /* name, signature, funcPtr */
153 {"native_pairing_start", "(Ljava/lang/String;Ljava/lang/String;)I",
154 (void*)native_pairing_start},
155 {"native_pairing_cancel", "()V", (void*)native_pairing_cancel},
156 {"native_pairing_wait", "()Z", (void*)native_pairing_wait},
157 };
158
register_android_server_AdbDebuggingManager(JNIEnv * env)159 int register_android_server_AdbDebuggingManager(JNIEnv* env) {
160 int res = jniRegisterNativeMethods(env,
161 "com/android/server/adb/AdbDebuggingManager$PairingThread",
162 gPairingThreadMethods, NELEM(gPairingThreadMethods));
163 (void)res; // Faked use when LOG_NDEBUG.
164 LOG_FATAL_IF(res < 0, "Unable to register native methods.");
165 return 0;
166 }
167
168 } /* namespace android */
169