243 lines
7 KiB
C++
243 lines
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 <ctype.h>
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#include <endian.h>
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#include <fcntl.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 "LogBuffer.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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#include "LogUtils.h"
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const uint64_t LogBufferElement::FLUSH_ERROR(0);
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atomic_int_fast64_t LogBufferElement::sequence(1);
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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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uint32_t LogBufferElement::getTag() const {
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if (((mLogId != LOG_ID_EVENTS) && (mLogId != LOG_ID_SECURITY)) ||
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!mMsg || (mMsgLen < sizeof(uint32_t))) {
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return 0;
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}
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return le32toh(reinterpret_cast<android_event_header_t *>(mMsg)->tag);
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}
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// caller must own and free character string
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char *android::tidToName(pid_t tid) {
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char *retval = NULL;
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char buffer[256];
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snprintf(buffer, sizeof(buffer), "/proc/%u/comm", tid);
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int fd = open(buffer, O_RDONLY);
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if (fd >= 0) {
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ssize_t ret = read(fd, buffer, sizeof(buffer));
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if (ret >= (ssize_t)sizeof(buffer)) {
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ret = sizeof(buffer) - 1;
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}
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while ((ret > 0) && isspace(buffer[ret - 1])) {
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--ret;
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}
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if (ret > 0) {
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buffer[ret] = '\0';
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retval = strdup(buffer);
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}
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close(fd);
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}
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// if nothing for comm, check out cmdline
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char *name = android::pidToName(tid);
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if (!retval) {
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retval = name;
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name = NULL;
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}
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// check if comm is truncated, see if cmdline has full representation
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if (name) {
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// impossible for retval to be NULL if name not NULL
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size_t retval_len = strlen(retval);
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size_t name_len = strlen(name);
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// KISS: ToDo: Only checks prefix truncated, not suffix, or both
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if ((retval_len < name_len)
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&& !fast<strcmp>(retval, name + name_len - retval_len)) {
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free(retval);
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retval = name;
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} else {
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free(name);
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}
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}
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return retval;
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}
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// assumption: mMsg == NULL
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size_t LogBufferElement::populateDroppedMessage(char *&buffer,
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LogBuffer *parent) {
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static const char tag[] = "chatty";
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if (!__android_log_is_loggable(ANDROID_LOG_INFO, tag, ANDROID_LOG_VERBOSE)) {
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return 0;
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}
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static const char format_uid[] = "uid=%u%s%s expire %u line%s";
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parent->lock();
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const char *name = parent->uidToName(mUid);
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parent->unlock();
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const char *commName = android::tidToName(mTid);
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if (!commName && (mTid != mPid)) {
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commName = android::tidToName(mPid);
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}
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if (!commName) {
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parent->lock();
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commName = parent->pidToName(mPid);
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parent->unlock();
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}
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if (name && name[0] && commName && (name[0] == commName[0])) {
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size_t len = strlen(name + 1);
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if (!strncmp(name + 1, commName + 1, len)) {
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if (commName[len + 1] == '\0') {
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free(const_cast<char *>(commName));
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commName = NULL;
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} else {
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free(const_cast<char *>(name));
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name = NULL;
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}
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}
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}
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if (name) {
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char *buf = NULL;
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asprintf(&buf, "(%s)", name);
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if (buf) {
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free(const_cast<char *>(name));
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name = buf;
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}
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}
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if (commName) {
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char *buf = NULL;
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asprintf(&buf, " %s", commName);
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if (buf) {
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free(const_cast<char *>(commName));
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commName = buf;
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}
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}
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// identical to below to calculate the buffer size required
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size_t len = snprintf(NULL, 0, format_uid, mUid, name ? name : "",
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commName ? commName : "",
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mDropped, (mDropped > 1) ? "s" : "");
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size_t hdrLen;
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// LOG_ID_SECURITY not strictly needed since spam filter not activated,
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// but required for accuracy.
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if ((mLogId == LOG_ID_EVENTS) || (mLogId == LOG_ID_SECURITY)) {
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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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free(const_cast<char *>(name));
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free(const_cast<char *>(commName));
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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) || (mLogId == LOG_ID_SECURITY)) {
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android_log_event_string_t *event =
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reinterpret_cast<android_log_event_string_t *>(buffer);
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event->header.tag = htole32(CHATTY_LOG_TAG);
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event->type = EVENT_TYPE_STRING;
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event->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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snprintf(buffer + hdrLen, len + 1, format_uid, mUid, name ? name : "",
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commName ? commName : "",
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mDropped, (mDropped > 1) ? "s" : "");
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free(const_cast<char *>(name));
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free(const_cast<char *>(commName));
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return retval;
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}
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uint64_t LogBufferElement::flushTo(SocketClient *reader, LogBuffer *parent,
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bool privileged) {
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struct logger_entry_v4 entry;
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memset(&entry, 0, sizeof(struct logger_entry_v4));
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entry.hdr_size = privileged ?
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sizeof(struct logger_entry_v4) :
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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.uid = mUid;
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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 = entry.hdr_size;
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char *buffer = NULL;
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if (!mMsg) {
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entry.len = populateDroppedMessage(buffer, parent);
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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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