Michal Karpinski | 6235a94 | 2016-03-15 12:07:23 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2016 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 | #include <fcntl.h> |
| 18 | |
| 19 | #include "JNIHelp.h" |
| 20 | #include "core_jni_helpers.h" |
| 21 | #include "jni.h" |
Mark Salyzyn | 834763b | 2016-10-04 09:01:37 -0700 | [diff] [blame] | 22 | #include <private/android_logger.h> |
Michal Karpinski | 6235a94 | 2016-03-15 12:07:23 +0000 | [diff] [blame] | 23 | |
| 24 | // The size of the tag number comes out of the payload size. |
| 25 | #define MAX_EVENT_PAYLOAD (LOGGER_ENTRY_MAX_PAYLOAD - sizeof(int32_t)) |
| 26 | |
| 27 | namespace android { |
| 28 | |
| 29 | static jclass gCollectionClass; |
| 30 | static jmethodID gCollectionAddID; |
| 31 | |
| 32 | static jclass gEventClass; |
| 33 | static jmethodID gEventInitID; |
| 34 | |
| 35 | static jclass gIntegerClass; |
| 36 | static jfieldID gIntegerValueID; |
| 37 | |
| 38 | static jclass gLongClass; |
| 39 | static jfieldID gLongValueID; |
| 40 | |
| 41 | static jclass gFloatClass; |
| 42 | static jfieldID gFloatValueID; |
| 43 | |
| 44 | static jclass gStringClass; |
| 45 | |
| 46 | |
| 47 | static jboolean android_app_admin_SecurityLog_isLoggingEnabled(JNIEnv* env, |
| 48 | jobject /* clazz */) { |
| 49 | return (bool)__android_log_security(); |
| 50 | } |
| 51 | |
| 52 | static jint android_app_admin_SecurityLog_writeEvent_String(JNIEnv* env, |
| 53 | jobject /* clazz */, |
| 54 | jint tag, jstring value) { |
| 55 | uint8_t buf[MAX_EVENT_PAYLOAD]; |
| 56 | |
| 57 | // Don't throw NPE -- I feel like it's sort of mean for a logging function |
| 58 | // to be all crashy if you pass in NULL -- but make the NULL value explicit. |
| 59 | const char *str = value != NULL ? env->GetStringUTFChars(value, NULL) : "NULL"; |
| 60 | uint32_t len = strlen(str); |
| 61 | size_t max = sizeof(buf) - sizeof(len) - 2; // Type byte, final newline |
| 62 | if (len > max) len = max; |
| 63 | |
| 64 | buf[0] = EVENT_TYPE_STRING; |
| 65 | memcpy(&buf[1], &len, sizeof(len)); |
| 66 | memcpy(&buf[1 + sizeof(len)], str, len); |
| 67 | buf[1 + sizeof(len) + len] = '\n'; |
| 68 | |
| 69 | if (value != NULL) env->ReleaseStringUTFChars(value, str); |
| 70 | return __android_log_security_bwrite(tag, buf, 2 + sizeof(len) + len); |
| 71 | } |
| 72 | |
| 73 | static jint android_app_admin_SecurityLog_writeEvent_Array(JNIEnv* env, jobject clazz, |
| 74 | jint tag, jobjectArray value) { |
| 75 | if (value == NULL) { |
| 76 | return android_app_admin_SecurityLog_writeEvent_String(env, clazz, tag, NULL); |
| 77 | } |
| 78 | |
| 79 | uint8_t buf[MAX_EVENT_PAYLOAD]; |
| 80 | const size_t max = sizeof(buf) - 1; // leave room for final newline |
| 81 | size_t pos = 2; // Save room for type tag & array count |
| 82 | |
| 83 | jsize copied = 0, num = env->GetArrayLength(value); |
| 84 | for (; copied < num && copied < 255; ++copied) { |
| 85 | jobject item = env->GetObjectArrayElement(value, copied); |
| 86 | if (item == NULL || env->IsInstanceOf(item, gStringClass)) { |
| 87 | if (pos + 1 + sizeof(jint) > max) break; |
| 88 | const char *str = item != NULL ? env->GetStringUTFChars((jstring) item, NULL) : "NULL"; |
| 89 | jint len = strlen(str); |
| 90 | if (pos + 1 + sizeof(len) + len > max) len = max - pos - 1 - sizeof(len); |
| 91 | buf[pos++] = EVENT_TYPE_STRING; |
| 92 | memcpy(&buf[pos], &len, sizeof(len)); |
| 93 | memcpy(&buf[pos + sizeof(len)], str, len); |
| 94 | pos += sizeof(len) + len; |
| 95 | if (item != NULL) env->ReleaseStringUTFChars((jstring) item, str); |
| 96 | } else if (env->IsInstanceOf(item, gIntegerClass)) { |
| 97 | jint intVal = env->GetIntField(item, gIntegerValueID); |
| 98 | if (pos + 1 + sizeof(intVal) > max) break; |
| 99 | buf[pos++] = EVENT_TYPE_INT; |
| 100 | memcpy(&buf[pos], &intVal, sizeof(intVal)); |
| 101 | pos += sizeof(intVal); |
| 102 | } else if (env->IsInstanceOf(item, gLongClass)) { |
| 103 | jlong longVal = env->GetLongField(item, gLongValueID); |
| 104 | if (pos + 1 + sizeof(longVal) > max) break; |
| 105 | buf[pos++] = EVENT_TYPE_LONG; |
| 106 | memcpy(&buf[pos], &longVal, sizeof(longVal)); |
| 107 | pos += sizeof(longVal); |
| 108 | } else if (env->IsInstanceOf(item, gFloatClass)) { |
| 109 | jfloat floatVal = env->GetFloatField(item, gFloatValueID); |
| 110 | if (pos + 1 + sizeof(floatVal) > max) break; |
| 111 | buf[pos++] = EVENT_TYPE_FLOAT; |
| 112 | memcpy(&buf[pos], &floatVal, sizeof(floatVal)); |
| 113 | pos += sizeof(floatVal); |
| 114 | } else { |
| 115 | jniThrowException(env, |
| 116 | "java/lang/IllegalArgumentException", |
| 117 | "Invalid payload item type"); |
| 118 | return -1; |
| 119 | } |
| 120 | env->DeleteLocalRef(item); |
| 121 | } |
| 122 | |
| 123 | buf[0] = EVENT_TYPE_LIST; |
| 124 | buf[1] = copied; |
| 125 | buf[pos++] = '\n'; |
| 126 | return __android_log_security_bwrite(tag, buf, pos); |
| 127 | } |
| 128 | |
| 129 | static void readEvents(JNIEnv* env, int loggerMode, jlong startTime, jobject out) { |
| 130 | struct logger_list *logger_list; |
| 131 | if (startTime) { |
| 132 | logger_list = android_logger_list_alloc_time(loggerMode, |
| 133 | log_time(startTime / NS_PER_SEC, startTime % NS_PER_SEC), 0); |
| 134 | } else { |
| 135 | logger_list = android_logger_list_alloc(loggerMode, 0, 0); |
| 136 | } |
| 137 | if (!logger_list) { |
| 138 | jniThrowIOException(env, errno); |
| 139 | return; |
| 140 | } |
| 141 | |
| 142 | if (!android_logger_open(logger_list, LOG_ID_SECURITY)) { |
| 143 | jniThrowIOException(env, errno); |
| 144 | android_logger_list_free(logger_list); |
| 145 | return; |
| 146 | } |
| 147 | |
| 148 | while (1) { |
| 149 | log_msg log_msg; |
| 150 | int ret = android_logger_list_read(logger_list, &log_msg); |
| 151 | |
| 152 | if (ret == 0) { |
| 153 | break; |
| 154 | } |
| 155 | if (ret < 0) { |
| 156 | if (ret == -EINTR) { |
| 157 | continue; |
| 158 | } |
| 159 | if (ret == -EINVAL) { |
| 160 | jniThrowException(env, "java/io/IOException", "Event too short"); |
| 161 | } else if (ret != -EAGAIN) { |
| 162 | jniThrowIOException(env, -ret); // Will throw on return |
| 163 | } |
| 164 | break; |
| 165 | } |
| 166 | |
| 167 | if (log_msg.id() != LOG_ID_SECURITY) { |
| 168 | continue; |
| 169 | } |
| 170 | |
| 171 | jsize len = ret; |
| 172 | jbyteArray array = env->NewByteArray(len); |
| 173 | if (array == NULL) { |
| 174 | break; |
| 175 | } |
| 176 | |
| 177 | jbyte *bytes = env->GetByteArrayElements(array, NULL); |
| 178 | memcpy(bytes, log_msg.buf, len); |
| 179 | env->ReleaseByteArrayElements(array, bytes, 0); |
| 180 | |
| 181 | jobject event = env->NewObject(gEventClass, gEventInitID, array); |
| 182 | if (event == NULL) { |
| 183 | break; |
| 184 | } |
| 185 | |
| 186 | env->CallBooleanMethod(out, gCollectionAddID, event); |
| 187 | env->DeleteLocalRef(event); |
| 188 | env->DeleteLocalRef(array); |
| 189 | } |
| 190 | |
| 191 | android_logger_list_close(logger_list); |
| 192 | } |
| 193 | |
| 194 | static void android_app_admin_SecurityLog_readEvents(JNIEnv* env, jobject /* clazz */, |
| 195 | jobject out) { |
| 196 | |
| 197 | if (out == NULL) { |
| 198 | jniThrowNullPointerException(env, NULL); |
| 199 | return; |
| 200 | } |
| 201 | readEvents(env, ANDROID_LOG_RDONLY | ANDROID_LOG_NONBLOCK, 0, out); |
| 202 | } |
| 203 | |
| 204 | static void android_app_admin_SecurityLog_readEventsSince(JNIEnv* env, jobject /* clazz */, |
| 205 | jlong timestamp, |
| 206 | jobject out) { |
| 207 | |
| 208 | if (out == NULL) { |
| 209 | jniThrowNullPointerException(env, NULL); |
| 210 | return; |
| 211 | } |
| 212 | readEvents(env, ANDROID_LOG_RDONLY | ANDROID_LOG_NONBLOCK, timestamp, out); |
| 213 | } |
| 214 | |
| 215 | static void android_app_admin_SecurityLog_readPreviousEvents(JNIEnv* env, jobject /* clazz */, |
| 216 | jobject out) { |
| 217 | |
| 218 | if (out == NULL) { |
| 219 | jniThrowNullPointerException(env, NULL); |
| 220 | return; |
| 221 | } |
| 222 | readEvents(env, ANDROID_LOG_RDONLY | ANDROID_LOG_NONBLOCK | ANDROID_LOG_PSTORE, 0, out); |
| 223 | } |
| 224 | |
| 225 | static void android_app_admin_SecurityLog_readEventsOnWrapping(JNIEnv* env, jobject /* clazz */, |
| 226 | jlong timestamp, |
| 227 | jobject out) { |
| 228 | if (out == NULL) { |
| 229 | jniThrowNullPointerException(env, NULL); |
| 230 | return; |
| 231 | } |
| 232 | readEvents(env, ANDROID_LOG_RDONLY | ANDROID_LOG_NONBLOCK | ANDROID_LOG_WRAP, timestamp, out); |
| 233 | } |
| 234 | |
| 235 | /* |
| 236 | * JNI registration. |
| 237 | */ |
| 238 | static const JNINativeMethod gRegisterMethods[] = { |
| 239 | /* name, signature, funcPtr */ |
| 240 | { "isLoggingEnabled", |
| 241 | "()Z", |
| 242 | (void*) android_app_admin_SecurityLog_isLoggingEnabled |
| 243 | }, |
| 244 | { "writeEvent", |
| 245 | "(ILjava/lang/String;)I", |
| 246 | (void*) android_app_admin_SecurityLog_writeEvent_String |
| 247 | }, |
| 248 | { "writeEvent", |
| 249 | "(I[Ljava/lang/Object;)I", |
| 250 | (void*) android_app_admin_SecurityLog_writeEvent_Array |
| 251 | }, |
| 252 | { "readEvents", |
| 253 | "(Ljava/util/Collection;)V", |
| 254 | (void*) android_app_admin_SecurityLog_readEvents |
| 255 | }, |
| 256 | { "readEventsSince", |
| 257 | "(JLjava/util/Collection;)V", |
| 258 | (void*) android_app_admin_SecurityLog_readEventsSince |
| 259 | }, |
| 260 | { "readPreviousEvents", |
| 261 | "(Ljava/util/Collection;)V", |
| 262 | (void*) android_app_admin_SecurityLog_readPreviousEvents |
| 263 | }, |
| 264 | { "readEventsOnWrapping", |
| 265 | "(JLjava/util/Collection;)V", |
| 266 | (void*) android_app_admin_SecurityLog_readEventsOnWrapping |
| 267 | }, |
| 268 | }; |
| 269 | |
| 270 | static struct { const char *name; jclass *clazz; } gClasses[] = { |
| 271 | { "android/app/admin/SecurityLog$SecurityEvent", &gEventClass }, |
| 272 | { "java/lang/Integer", &gIntegerClass }, |
| 273 | { "java/lang/Long", &gLongClass }, |
| 274 | { "java/lang/Float", &gFloatClass }, |
| 275 | { "java/lang/String", &gStringClass }, |
| 276 | { "java/util/Collection", &gCollectionClass }, |
| 277 | }; |
| 278 | |
| 279 | static struct { jclass *c; const char *name, *ft; jfieldID *id; } gFields[] = { |
| 280 | { &gIntegerClass, "value", "I", &gIntegerValueID }, |
| 281 | { &gLongClass, "value", "J", &gLongValueID }, |
| 282 | { &gFloatClass, "value", "F", &gFloatValueID }, |
| 283 | }; |
| 284 | |
| 285 | static struct { jclass *c; const char *name, *mt; jmethodID *id; } gMethods[] = { |
| 286 | { &gEventClass, "<init>", "([B)V", &gEventInitID }, |
| 287 | { &gCollectionClass, "add", "(Ljava/lang/Object;)Z", &gCollectionAddID }, |
| 288 | }; |
| 289 | |
| 290 | int register_android_app_admin_SecurityLog(JNIEnv* env) { |
| 291 | for (int i = 0; i < NELEM(gClasses); ++i) { |
| 292 | jclass clazz = FindClassOrDie(env, gClasses[i].name); |
| 293 | *gClasses[i].clazz = MakeGlobalRefOrDie(env, clazz); |
| 294 | } |
| 295 | |
| 296 | for (int i = 0; i < NELEM(gFields); ++i) { |
| 297 | *gFields[i].id = GetFieldIDOrDie(env, |
| 298 | *gFields[i].c, gFields[i].name, gFields[i].ft); |
| 299 | } |
| 300 | |
| 301 | for (int i = 0; i < NELEM(gMethods); ++i) { |
| 302 | *gMethods[i].id = GetMethodIDOrDie(env, |
| 303 | *gMethods[i].c, gMethods[i].name, gMethods[i].mt); |
| 304 | } |
| 305 | |
| 306 | return RegisterMethodsOrDie( |
| 307 | env, |
| 308 | "android/app/admin/SecurityLog", |
| 309 | gRegisterMethods, NELEM(gRegisterMethods)); |
| 310 | } |
| 311 | |
| 312 | }; // namespace android |