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      1 /*
      2  * Copyright (C) 2012-2014 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 #ifndef _LOGD_LOG_BUFFER_ELEMENT_H__
     18 #define _LOGD_LOG_BUFFER_ELEMENT_H__
     19 
     20 #include <stdatomic.h>
     21 #include <stdlib.h>
     22 #include <sys/types.h>
     23 
     24 #include <log/log.h>
     25 #include <sysutils/SocketClient.h>
     26 
     27 class LogBuffer;
     28 
     29 #define EXPIRE_HOUR_THRESHOLD 24  // Only expire chatty UID logs to preserve
     30                                   // non-chatty UIDs less than this age in hours
     31 #define EXPIRE_THRESHOLD 10       // A smaller expire count is considered too
     32                                   // chatty for the temporal expire messages
     33 #define EXPIRE_RATELIMIT 10  // maximum rate in seconds to report expiration
     34 
     35 class __attribute__((packed)) LogBufferElement {
     36     friend LogBuffer;
     37 
     38     // sized to match reality of incoming log packets
     39     const uint32_t mUid;
     40     const uint32_t mPid;
     41     const uint32_t mTid;
     42     log_time mRealTime;
     43     char* mMsg;
     44     union {
     45         const uint16_t mMsgLen;  // mDropped == false
     46         uint16_t mDroppedCount;  // mDropped == true
     47     };
     48     const uint8_t mLogId;
     49     bool mDropped;
     50 
     51     static atomic_int_fast64_t sequence;
     52 
     53     // assumption: mDropped == true
     54     size_t populateDroppedMessage(char*& buffer, LogBuffer* parent,
     55                                   bool lastSame);
     56 
     57    public:
     58     LogBufferElement(log_id_t log_id, log_time realtime, uid_t uid, pid_t pid,
     59                      pid_t tid, const char* msg, unsigned short len);
     60     LogBufferElement(const LogBufferElement& elem);
     61     ~LogBufferElement();
     62 
     63     bool isBinary(void) const {
     64         return (mLogId == LOG_ID_EVENTS) || (mLogId == LOG_ID_SECURITY);
     65     }
     66 
     67     log_id_t getLogId() const {
     68         return static_cast<log_id_t>(mLogId);
     69     }
     70     uid_t getUid(void) const {
     71         return mUid;
     72     }
     73     pid_t getPid(void) const {
     74         return mPid;
     75     }
     76     pid_t getTid(void) const {
     77         return mTid;
     78     }
     79     uint32_t getTag() const;
     80     unsigned short getDropped(void) const {
     81         return mDropped ? mDroppedCount : 0;
     82     }
     83     unsigned short setDropped(unsigned short value);
     84     unsigned short getMsgLen() const {
     85         return mDropped ? 0 : mMsgLen;
     86     }
     87     const char* getMsg() const {
     88         return mDropped ? nullptr : mMsg;
     89     }
     90     log_time getRealTime(void) const {
     91         return mRealTime;
     92     }
     93 
     94     static const log_time FLUSH_ERROR;
     95     log_time flushTo(SocketClient* writer, LogBuffer* parent, bool privileged,
     96                      bool lastSame);
     97 };
     98 
     99 #endif
    100