136 lines
3.7 KiB
C++
136 lines
3.7 KiB
C++
/*
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* Copyright (C) 2012-2014 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <endian.h>
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#include <stdio.h>
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#include <string.h>
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#include <time.h>
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#include <unistd.h>
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#include <log/logger.h>
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#include <private/android_logger.h>
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#include "LogBufferElement.h"
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#include "LogCommand.h"
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#include "LogReader.h"
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const uint64_t LogBufferElement::FLUSH_ERROR(0);
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atomic_int_fast64_t LogBufferElement::sequence;
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LogBufferElement::LogBufferElement(log_id_t log_id, log_time realtime,
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uid_t uid, pid_t pid, pid_t tid,
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const char *msg, unsigned short len)
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: mLogId(log_id)
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, mUid(uid)
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, mPid(pid)
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, mTid(tid)
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, mMsgLen(len)
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, mSequence(sequence.fetch_add(1, memory_order_relaxed))
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, mRealTime(realtime) {
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mMsg = new char[len];
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memcpy(mMsg, msg, len);
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}
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LogBufferElement::~LogBufferElement() {
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delete [] mMsg;
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}
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// assumption: mMsg == NULL
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size_t LogBufferElement::populateDroppedMessage(char *&buffer, bool privileged) {
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static const char format_uid[] = "uid=%u dropped=%u";
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static const size_t unprivileged_offset = 7;
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static const char tag[] = "logd";
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size_t len;
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if (privileged) {
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len = snprintf(NULL, 0, format_uid, mUid, mDropped);
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} else {
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len = snprintf(NULL, 0, format_uid + unprivileged_offset, mDropped);
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}
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size_t hdrLen;
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if (mLogId == LOG_ID_EVENTS) {
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hdrLen = sizeof(android_log_event_string_t);
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} else {
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hdrLen = 1 + sizeof(tag);
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}
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buffer = static_cast<char *>(calloc(1, hdrLen + len + 1));
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if (!buffer) {
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return 0;
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}
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size_t retval = hdrLen + len;
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if (mLogId == LOG_ID_EVENTS) {
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android_log_event_string_t *e = reinterpret_cast<android_log_event_string_t *>(buffer);
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e->header.tag = htole32(LOGD_LOG_TAG);
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e->type = EVENT_TYPE_STRING;
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e->length = htole32(len);
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} else {
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++retval;
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buffer[0] = ANDROID_LOG_INFO;
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strcpy(buffer + 1, tag);
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}
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if (privileged) {
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snprintf(buffer + hdrLen, len + 1, format_uid, mUid, mDropped);
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} else {
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snprintf(buffer + hdrLen, len + 1, format_uid + unprivileged_offset, mDropped);
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}
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return retval;
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}
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uint64_t LogBufferElement::flushTo(SocketClient *reader) {
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struct logger_entry_v3 entry;
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memset(&entry, 0, sizeof(struct logger_entry_v3));
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entry.hdr_size = sizeof(struct logger_entry_v3);
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entry.lid = mLogId;
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entry.pid = mPid;
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entry.tid = mTid;
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entry.sec = mRealTime.tv_sec;
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entry.nsec = mRealTime.tv_nsec;
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struct iovec iovec[2];
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iovec[0].iov_base = &entry;
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iovec[0].iov_len = sizeof(struct logger_entry_v3);
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char *buffer = NULL;
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if (!mMsg) {
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entry.len = populateDroppedMessage(buffer, clientHasLogCredentials(reader));
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if (!entry.len) {
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return mSequence;
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}
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iovec[1].iov_base = buffer;
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} else {
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entry.len = mMsgLen;
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iovec[1].iov_base = mMsg;
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}
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iovec[1].iov_len = entry.len;
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uint64_t retval = reader->sendDatav(iovec, 2) ? FLUSH_ERROR : mSequence;
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if (buffer) {
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free(buffer);
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}
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return retval;
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}
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