Preeti Nagar | 473a35c | 2018-04-03 16:34:25 +0530 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (c) 2015, The Linux Foundation. All rights reserved. |
| 3 | * Not a Contribution. |
| 4 | * |
| 5 | * Copyright (C) 2007-2014 The Android Open Source Project |
| 6 | * |
| 7 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 8 | * you may not use this file except in compliance with the License. |
| 9 | * You may obtain a copy of the License at |
| 10 | * |
| 11 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 12 | * |
| 13 | * Unless required by applicable law or agreed to in writing, software |
| 14 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 15 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 16 | * See the License for the specific language governing permissions and |
| 17 | * limitations under the License. |
| 18 | */ |
| 19 | |
| 20 | #include <errno.h> |
| 21 | #include <fcntl.h> |
| 22 | #include <stdarg.h> |
| 23 | #include <stdio.h> |
| 24 | #include <stdlib.h> |
| 25 | #include <string.h> |
| 26 | #include <sys/stat.h> |
| 27 | #include <sys/types.h> |
| 28 | #include <sys/socket.h> |
| 29 | #include <sys/un.h> |
| 30 | #include <unistd.h> |
| 31 | #include <assert.h> |
| 32 | #include <cutils/properties.h> |
| 33 | #include <utils/String8.h> |
| 34 | #include <android_runtime/Log.h> |
| 35 | #include <utils/Log.h> |
| 36 | #ifdef __BIONIC__ |
| 37 | #include <android/set_abort_message.h> |
| 38 | #endif |
| 39 | #include <utils/Log.h> |
| 40 | |
| 41 | |
| 42 | #include "jni.h" |
| 43 | #include <nativehelper/JNIHelp.h> |
| 44 | #include "utils/misc.h" |
| 45 | #include "android_runtime/AndroidRuntime.h" |
| 46 | |
| 47 | #define LOG_BUF_SIZE 1024 |
| 48 | #define SEEMP_SOCK_NAME "/dev/socket/seempdw" |
| 49 | #define ZYGOTE_PARENT_PID 1 |
| 50 | #ifndef __unused |
| 51 | #define __unused __attribute__((__unused__)) |
| 52 | #endif |
| 53 | |
| 54 | static int __write_to_log_init(struct iovec *vec, size_t nr); |
| 55 | static int (*write_to_log)(struct iovec *vec, size_t nr) = __write_to_log_init; |
| 56 | static int logd_fd = -1; |
| 57 | |
| 58 | /* give up, resources too limited */ |
| 59 | static int __write_to_log_null(struct iovec *vec __unused, |
| 60 | size_t nr __unused) |
| 61 | { |
| 62 | return -1; |
| 63 | } |
| 64 | |
| 65 | /* log_init_lock assumed */ |
| 66 | static int __write_to_log_initialize() |
| 67 | { |
| 68 | int i, ret = 0; |
| 69 | if (logd_fd >= 0) { |
| 70 | i = logd_fd; |
| 71 | logd_fd = -1; |
| 72 | close(i); |
| 73 | } |
| 74 | |
| 75 | i = socket(PF_UNIX, SOCK_DGRAM | SOCK_CLOEXEC, 0); |
| 76 | if (i < 0) { |
| 77 | ret = -errno; |
| 78 | write_to_log = __write_to_log_null; |
| 79 | } else if (fcntl(i, F_SETFL, O_NONBLOCK) < 0) { |
| 80 | ret = -errno; |
| 81 | close(i); |
| 82 | i = -1; |
| 83 | write_to_log = __write_to_log_null; |
| 84 | } else { |
| 85 | struct sockaddr_un un; |
| 86 | memset(&un, 0, sizeof(struct sockaddr_un)); |
| 87 | un.sun_family = AF_UNIX; |
| 88 | strlcpy(un.sun_path, SEEMP_SOCK_NAME, sizeof(un.sun_path)); |
| 89 | if (connect(i, (struct sockaddr *)&un, sizeof(struct sockaddr_un)) < 0) { |
| 90 | ret = -errno; |
| 91 | close(i); |
| 92 | i = -1; |
| 93 | } |
| 94 | } |
| 95 | logd_fd = i; |
| 96 | return ret; |
| 97 | } |
| 98 | |
| 99 | static int __write_to_log_socket(struct iovec *vec, size_t nr) |
| 100 | { |
| 101 | ssize_t ret; |
| 102 | if (logd_fd < 0) { |
| 103 | return -EBADF; |
| 104 | } |
| 105 | |
| 106 | /* |
| 107 | * The write below could be lost, but will never block. |
| 108 | * |
| 109 | * ENOTCONN occurs if logd dies. |
| 110 | * EAGAIN occurs if logd is overloaded. |
| 111 | */ |
| 112 | ret = writev(logd_fd, vec, nr); |
| 113 | if (ret < 0) { |
| 114 | ret = -errno; |
| 115 | if (ret == -ENOTCONN) { |
| 116 | ret = __write_to_log_initialize(); |
| 117 | if (ret < 0) { |
| 118 | return ret; |
| 119 | } |
| 120 | |
| 121 | ret = writev(logd_fd, vec, nr); |
| 122 | if (ret < 0) { |
| 123 | ret = -errno; |
| 124 | } |
| 125 | } |
| 126 | } |
| 127 | |
| 128 | return ret; |
| 129 | } |
| 130 | |
| 131 | static int __write_to_log_init(struct iovec *vec, size_t nr) |
| 132 | { |
| 133 | if (write_to_log == __write_to_log_init) { |
| 134 | |
| 135 | if (getppid() == ZYGOTE_PARENT_PID) { |
| 136 | return 0; |
| 137 | } |
| 138 | |
| 139 | int ret; |
| 140 | |
| 141 | ret = __write_to_log_initialize(); |
| 142 | if (ret < 0) { |
| 143 | return ret; |
| 144 | } |
| 145 | |
| 146 | write_to_log = __write_to_log_socket; |
| 147 | } |
| 148 | return write_to_log(vec, nr); |
| 149 | } |
| 150 | |
| 151 | int __android_seemp_socket_write(int len, const char *msg) |
| 152 | { |
| 153 | struct iovec vec; |
| 154 | vec.iov_base = (void *) msg; |
| 155 | vec.iov_len = len; |
| 156 | |
| 157 | return write_to_log(&vec, 1); |
| 158 | } |
| 159 | |
| 160 | namespace android { |
| 161 | |
| 162 | /* |
| 163 | * In class android.util.Log: |
| 164 | * public static native int println_native(int buffer, int priority, String tag, String msg) |
| 165 | */ |
| 166 | static jint android_util_SeempLog_println_native(JNIEnv* env, jobject clazz, |
| 167 | jint api, jstring msgObj) |
| 168 | { |
| 169 | if (msgObj == NULL) { |
| 170 | jniThrowNullPointerException(env, "seemp_println needs a message"); |
| 171 | return -1; |
| 172 | } |
| 173 | |
| 174 | int apiId = (int)api; |
| 175 | int apiIdLen = sizeof(apiId); |
| 176 | int utf8MsgLen = env->GetStringUTFLength(msgObj); |
| 177 | int len = apiIdLen + 1 + utf8MsgLen + 1; |
| 178 | char *msg = (char*)malloc(len); |
| 179 | if ( NULL == msg ) |
| 180 | { |
| 181 | return -1; |
| 182 | } |
| 183 | char *params = msg + apiIdLen + 1; // api_id + encoding byte + params |
| 184 | |
| 185 | *((int*)msg) = apiId; // copy api id |
| 186 | // // skip encoding byte |
| 187 | env->GetStringUTFRegion(msgObj, 0, env->GetStringLength(msgObj), params); // copy message |
| 188 | msg[len - 1] = 0; // copy terminating zero |
| 189 | |
| 190 | int res = __android_seemp_socket_write(len, msg); // send message |
| 191 | |
| 192 | free(msg); |
| 193 | |
| 194 | return res; |
| 195 | } |
| 196 | |
| 197 | /* |
| 198 | * JNI registration. |
| 199 | */ |
| 200 | static JNINativeMethod gMethods[] = { |
| 201 | /* name, signature, funcPtr */ |
| 202 | { "seemp_println_native", "(ILjava/lang/String;)I", |
| 203 | (void*) android_util_SeempLog_println_native }, |
| 204 | }; |
| 205 | |
| 206 | int register_android_util_SeempLog(JNIEnv* env) |
| 207 | { |
| 208 | jclass clazz = env->FindClass("android/util/SeempLog"); |
| 209 | if (clazz == NULL) { |
| 210 | return -1; |
| 211 | } |
| 212 | |
| 213 | return AndroidRuntime::registerNativeMethods(env, "android/util/SeempLog", gMethods, |
| 214 | NELEM(gMethods)); |
| 215 | } |
| 216 | |
| 217 | }; // namespace android |