| /* |
| * Copyright (C) 2016 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include <fcntl.h> |
| |
| #include <log/log_event_list.h> |
| #include <log/log_id.h> |
| #include <private/android_logger.h> |
| |
| #include <nativehelper/JNIHelp.h> |
| #include "core_jni_helpers.h" |
| #include "jni.h" |
| |
| namespace android { |
| |
| static jclass gCollectionClass; |
| static jmethodID gCollectionAddID; |
| |
| static jclass gEventClass; |
| static jmethodID gEventInitID; |
| |
| static jclass gIntegerClass; |
| static jfieldID gIntegerValueID; |
| |
| static jclass gLongClass; |
| static jfieldID gLongValueID; |
| |
| static jclass gFloatClass; |
| static jfieldID gFloatValueID; |
| |
| static jclass gStringClass; |
| |
| |
| static jboolean android_app_admin_SecurityLog_isLoggingEnabled(JNIEnv* env, |
| jobject /* clazz */) { |
| return (bool)__android_log_security(); |
| } |
| |
| static jint android_app_admin_SecurityLog_writeEvent_String(JNIEnv* env, |
| jobject /* clazz */, |
| jint tag, jstring value) { |
| android_log_event_list ctx(tag); |
| // Don't throw NPE -- I feel like it's sort of mean for a logging function |
| // to be all crashy if you pass in NULL -- but make the NULL value explicit. |
| if (value != NULL) { |
| const char *str = env->GetStringUTFChars(value, NULL); |
| ctx << str; |
| env->ReleaseStringUTFChars(value, str); |
| } else { |
| ctx << "NULL"; |
| } |
| return ctx.write(log_id_t::LOG_ID_SECURITY); |
| } |
| |
| static jint android_app_admin_SecurityLog_writeEvent_Array(JNIEnv* env, jobject clazz, |
| jint tag, jobjectArray value) { |
| android_log_event_list ctx(tag); |
| |
| if (value == NULL) { |
| ctx << "[NULL]"; |
| return ctx.write(log_id_t::LOG_ID_SECURITY); |
| } |
| |
| jsize copied = 0, num = env->GetArrayLength(value); |
| for (; copied < num && copied < 255; ++copied) { |
| if (ctx.status()) break; |
| jobject item = env->GetObjectArrayElement(value, copied); |
| if (item == NULL) { |
| ctx << "NULL"; |
| } else if (env->IsInstanceOf(item, gStringClass)) { |
| const char *str = env->GetStringUTFChars((jstring) item, NULL); |
| ctx << str; |
| env->ReleaseStringUTFChars((jstring) item, str); |
| } else if (env->IsInstanceOf(item, gIntegerClass)) { |
| ctx << (int32_t)env->GetIntField(item, gIntegerValueID); |
| } else if (env->IsInstanceOf(item, gLongClass)) { |
| ctx << (int64_t)env->GetLongField(item, gLongValueID); |
| } else if (env->IsInstanceOf(item, gFloatClass)) { |
| ctx << (float)env->GetFloatField(item, gFloatValueID); |
| } else { |
| jniThrowException(env, |
| "java/lang/IllegalArgumentException", |
| "Invalid payload item type"); |
| return -1; |
| } |
| env->DeleteLocalRef(item); |
| } |
| return ctx.write(log_id_t::LOG_ID_SECURITY); |
| } |
| |
| static void readEvents(JNIEnv* env, int loggerMode, jlong startTime, jobject out) { |
| struct logger_list *logger_list; |
| if (startTime) { |
| logger_list = android_logger_list_alloc_time(loggerMode, |
| log_time(startTime / NS_PER_SEC, startTime % NS_PER_SEC), 0); |
| } else { |
| logger_list = android_logger_list_alloc(loggerMode, 0, 0); |
| } |
| if (!logger_list) { |
| jniThrowIOException(env, errno); |
| return; |
| } |
| |
| if (!android_logger_open(logger_list, LOG_ID_SECURITY)) { |
| jniThrowIOException(env, errno); |
| android_logger_list_free(logger_list); |
| return; |
| } |
| |
| while (1) { |
| log_msg log_msg; |
| int ret = android_logger_list_read(logger_list, &log_msg); |
| |
| if (ret == 0) { |
| break; |
| } |
| if (ret < 0) { |
| if (ret == -EINTR) { |
| continue; |
| } |
| if (ret == -EINVAL) { |
| jniThrowException(env, "java/io/IOException", "Event too short"); |
| } else if (ret != -EAGAIN) { |
| jniThrowIOException(env, -ret); // Will throw on return |
| } |
| break; |
| } |
| |
| if (log_msg.id() != LOG_ID_SECURITY) { |
| continue; |
| } |
| |
| jsize len = ret; |
| jbyteArray array = env->NewByteArray(len); |
| if (array == NULL) { |
| break; |
| } |
| |
| jbyte *bytes = env->GetByteArrayElements(array, NULL); |
| memcpy(bytes, log_msg.buf, len); |
| env->ReleaseByteArrayElements(array, bytes, 0); |
| |
| jobject event = env->NewObject(gEventClass, gEventInitID, array); |
| if (event == NULL) { |
| break; |
| } |
| |
| env->CallBooleanMethod(out, gCollectionAddID, event); |
| env->DeleteLocalRef(event); |
| env->DeleteLocalRef(array); |
| if (env->ExceptionCheck() == JNI_TRUE) { |
| break; |
| } |
| } |
| |
| android_logger_list_close(logger_list); |
| } |
| |
| static void android_app_admin_SecurityLog_readEvents(JNIEnv* env, jobject /* clazz */, |
| jobject out) { |
| |
| if (out == NULL) { |
| jniThrowNullPointerException(env, NULL); |
| return; |
| } |
| readEvents(env, ANDROID_LOG_RDONLY | ANDROID_LOG_NONBLOCK, 0, out); |
| } |
| |
| static void android_app_admin_SecurityLog_readEventsSince(JNIEnv* env, jobject /* clazz */, |
| jlong timestamp, |
| jobject out) { |
| |
| if (out == NULL) { |
| jniThrowNullPointerException(env, NULL); |
| return; |
| } |
| readEvents(env, ANDROID_LOG_RDONLY | ANDROID_LOG_NONBLOCK, timestamp, out); |
| } |
| |
| static void android_app_admin_SecurityLog_readPreviousEvents(JNIEnv* env, jobject /* clazz */, |
| jobject out) { |
| |
| if (out == NULL) { |
| jniThrowNullPointerException(env, NULL); |
| return; |
| } |
| readEvents(env, ANDROID_LOG_RDONLY | ANDROID_LOG_NONBLOCK | ANDROID_LOG_PSTORE, 0, out); |
| } |
| |
| static void android_app_admin_SecurityLog_readEventsOnWrapping(JNIEnv* env, jobject /* clazz */, |
| jlong timestamp, |
| jobject out) { |
| if (out == NULL) { |
| jniThrowNullPointerException(env, NULL); |
| return; |
| } |
| readEvents(env, ANDROID_LOG_RDONLY | ANDROID_LOG_NONBLOCK | ANDROID_LOG_WRAP, timestamp, out); |
| } |
| |
| /* |
| * JNI registration. |
| */ |
| static const JNINativeMethod gRegisterMethods[] = { |
| /* name, signature, funcPtr */ |
| { "isLoggingEnabled", |
| "()Z", |
| (void*) android_app_admin_SecurityLog_isLoggingEnabled |
| }, |
| { "writeEvent", |
| "(ILjava/lang/String;)I", |
| (void*) android_app_admin_SecurityLog_writeEvent_String |
| }, |
| { "writeEvent", |
| "(I[Ljava/lang/Object;)I", |
| (void*) android_app_admin_SecurityLog_writeEvent_Array |
| }, |
| { "readEvents", |
| "(Ljava/util/Collection;)V", |
| (void*) android_app_admin_SecurityLog_readEvents |
| }, |
| { "readEventsSince", |
| "(JLjava/util/Collection;)V", |
| (void*) android_app_admin_SecurityLog_readEventsSince |
| }, |
| { "readPreviousEvents", |
| "(Ljava/util/Collection;)V", |
| (void*) android_app_admin_SecurityLog_readPreviousEvents |
| }, |
| { "readEventsOnWrapping", |
| "(JLjava/util/Collection;)V", |
| (void*) android_app_admin_SecurityLog_readEventsOnWrapping |
| }, |
| }; |
| |
| static struct { const char *name; jclass *clazz; } gClasses[] = { |
| { "android/app/admin/SecurityLog$SecurityEvent", &gEventClass }, |
| { "java/lang/Integer", &gIntegerClass }, |
| { "java/lang/Long", &gLongClass }, |
| { "java/lang/Float", &gFloatClass }, |
| { "java/lang/String", &gStringClass }, |
| { "java/util/Collection", &gCollectionClass }, |
| }; |
| |
| static struct { jclass *c; const char *name, *ft; jfieldID *id; } gFields[] = { |
| { &gIntegerClass, "value", "I", &gIntegerValueID }, |
| { &gLongClass, "value", "J", &gLongValueID }, |
| { &gFloatClass, "value", "F", &gFloatValueID }, |
| }; |
| |
| static struct { jclass *c; const char *name, *mt; jmethodID *id; } gMethods[] = { |
| { &gEventClass, "<init>", "([B)V", &gEventInitID }, |
| { &gCollectionClass, "add", "(Ljava/lang/Object;)Z", &gCollectionAddID }, |
| }; |
| |
| int register_android_app_admin_SecurityLog(JNIEnv* env) { |
| for (int i = 0; i < NELEM(gClasses); ++i) { |
| jclass clazz = FindClassOrDie(env, gClasses[i].name); |
| *gClasses[i].clazz = MakeGlobalRefOrDie(env, clazz); |
| } |
| |
| for (int i = 0; i < NELEM(gFields); ++i) { |
| *gFields[i].id = GetFieldIDOrDie(env, |
| *gFields[i].c, gFields[i].name, gFields[i].ft); |
| } |
| |
| for (int i = 0; i < NELEM(gMethods); ++i) { |
| *gMethods[i].id = GetMethodIDOrDie(env, |
| *gMethods[i].c, gMethods[i].name, gMethods[i].mt); |
| } |
| |
| return RegisterMethodsOrDie( |
| env, |
| "android/app/admin/SecurityLog", |
| gRegisterMethods, NELEM(gRegisterMethods)); |
| } |
| |
| }; // namespace android |