262 lines
7.7 KiB
C
262 lines
7.7 KiB
C
/*
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* Copyright (C) 2007-2016 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 <errno.h>
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#include <fcntl.h>
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#include <inttypes.h>
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#include <poll.h>
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#include <stdarg.h>
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#include <stdatomic.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <time.h>
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#include <unistd.h>
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#include <cutils/sockets.h>
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#include <log/logd.h>
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#include <log/logger.h>
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#include <log/log_read.h>
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#include <private/android_filesystem_config.h>
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#include <private/android_logger.h>
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#include "config_write.h"
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#include "log_portability.h"
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#include "logger.h"
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/* branchless on many architectures. */
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#define min(x,y) ((y) ^ (((x) ^ (y)) & -((x) < (y))))
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static int logdAvailable(log_id_t LogId);
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static int logdOpen();
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static void logdClose();
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static int logdWrite(log_id_t logId, struct timespec *ts,
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struct iovec *vec, size_t nr);
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LIBLOG_HIDDEN struct android_log_transport_write logdLoggerWrite = {
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.node = { &logdLoggerWrite.node, &logdLoggerWrite.node },
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.context.sock = -1,
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.name = "logd",
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.available = logdAvailable,
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.open = logdOpen,
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.close = logdClose,
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.write = logdWrite,
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};
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/* log_init_lock assumed */
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static int logdOpen()
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{
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int i, ret = 0;
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if (logdLoggerWrite.context.sock < 0) {
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i = TEMP_FAILURE_RETRY(socket(PF_UNIX, SOCK_DGRAM | SOCK_CLOEXEC, 0));
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if (i < 0) {
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ret = -errno;
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} else if (TEMP_FAILURE_RETRY(fcntl(i, F_SETFL, O_NONBLOCK)) < 0) {
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ret = -errno;
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close(i);
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} else {
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struct sockaddr_un un;
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memset(&un, 0, sizeof(struct sockaddr_un));
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un.sun_family = AF_UNIX;
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strcpy(un.sun_path, "/dev/socket/logdw");
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if (TEMP_FAILURE_RETRY(connect(i, (struct sockaddr *)&un,
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sizeof(struct sockaddr_un))) < 0) {
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ret = -errno;
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close(i);
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} else {
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logdLoggerWrite.context.sock = i;
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}
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}
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}
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return ret;
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}
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static void logdClose()
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{
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if (logdLoggerWrite.context.sock >= 0) {
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close(logdLoggerWrite.context.sock);
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logdLoggerWrite.context.sock = -1;
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}
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}
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static int logdAvailable(log_id_t logId)
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{
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if (logId > LOG_ID_SECURITY) {
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return -EINVAL;
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}
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if (logdLoggerWrite.context.sock < 0) {
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if (access("/dev/socket/logdw", W_OK) == 0) {
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return 0;
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}
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return -EBADF;
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}
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return 1;
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}
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static int logdWrite(log_id_t logId, struct timespec *ts,
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struct iovec *vec, size_t nr)
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{
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ssize_t ret;
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static const unsigned headerLength = 1;
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struct iovec newVec[nr + headerLength];
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android_log_header_t header;
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size_t i, payloadSize;
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static atomic_int_fast32_t dropped;
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static atomic_int_fast32_t droppedSecurity;
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if (logdLoggerWrite.context.sock < 0) {
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return -EBADF;
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}
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/* logd, after initialization and priv drop */
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if (__android_log_uid() == AID_LOGD) {
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/*
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* ignore log messages we send to ourself (logd).
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* Such log messages are often generated by libraries we depend on
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* which use standard Android logging.
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*/
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return 0;
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}
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/*
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* struct {
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* // what we provide to socket
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* android_log_header_t header;
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* // caller provides
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* union {
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* struct {
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* char prio;
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* char payload[];
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* } string;
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* struct {
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* uint32_t tag
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* char payload[];
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* } binary;
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* };
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* };
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*/
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header.tid = gettid();
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header.realtime.tv_sec = ts->tv_sec;
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header.realtime.tv_nsec = ts->tv_nsec;
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newVec[0].iov_base = (unsigned char *)&header;
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newVec[0].iov_len = sizeof(header);
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if (logdLoggerWrite.context.sock > 0) {
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int32_t snapshot = atomic_exchange_explicit(&droppedSecurity, 0,
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memory_order_relaxed);
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if (snapshot) {
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android_log_event_int_t buffer;
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header.id = LOG_ID_SECURITY;
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buffer.header.tag = htole32(LIBLOG_LOG_TAG);
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buffer.payload.type = EVENT_TYPE_INT;
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buffer.payload.data = htole32(snapshot);
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newVec[headerLength].iov_base = &buffer;
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newVec[headerLength].iov_len = sizeof(buffer);
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ret = TEMP_FAILURE_RETRY(writev(logdLoggerWrite.context.sock, newVec, 2));
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if (ret != (ssize_t)(sizeof(header) + sizeof(buffer))) {
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atomic_fetch_add_explicit(&droppedSecurity, snapshot,
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memory_order_relaxed);
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}
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}
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snapshot = atomic_exchange_explicit(&dropped, 0, memory_order_relaxed);
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if (snapshot && __android_log_is_loggable(ANDROID_LOG_INFO,
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"liblog",
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ANDROID_LOG_VERBOSE)) {
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android_log_event_int_t buffer;
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header.id = LOG_ID_EVENTS;
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buffer.header.tag = htole32(LIBLOG_LOG_TAG);
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buffer.payload.type = EVENT_TYPE_INT;
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buffer.payload.data = htole32(snapshot);
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newVec[headerLength].iov_base = &buffer;
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newVec[headerLength].iov_len = sizeof(buffer);
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ret = TEMP_FAILURE_RETRY(writev(logdLoggerWrite.context.sock, newVec, 2));
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if (ret != (ssize_t)(sizeof(header) + sizeof(buffer))) {
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atomic_fetch_add_explicit(&dropped, snapshot,
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memory_order_relaxed);
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}
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}
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}
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header.id = logId;
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for (payloadSize = 0, i = headerLength; i < nr + headerLength; i++) {
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newVec[i].iov_base = vec[i - headerLength].iov_base;
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payloadSize += newVec[i].iov_len = vec[i - headerLength].iov_len;
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if (payloadSize > LOGGER_ENTRY_MAX_PAYLOAD) {
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newVec[i].iov_len -= payloadSize - LOGGER_ENTRY_MAX_PAYLOAD;
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if (newVec[i].iov_len) {
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++i;
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}
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break;
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}
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}
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/*
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* The write below could be lost, but will never block.
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*
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* ENOTCONN occurs if logd dies.
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* EAGAIN occurs if logd is overloaded.
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*/
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ret = TEMP_FAILURE_RETRY(writev(logdLoggerWrite.context.sock, newVec, i));
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if (ret < 0) {
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ret = -errno;
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if (ret == -ENOTCONN) {
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__android_log_lock();
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logdClose();
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ret = logdOpen();
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__android_log_unlock();
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if (ret < 0) {
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return ret;
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}
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ret = TEMP_FAILURE_RETRY(writev(logdLoggerWrite.context.sock, newVec, i));
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if (ret < 0) {
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ret = -errno;
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}
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}
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}
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if (ret > (ssize_t)sizeof(header)) {
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ret -= sizeof(header);
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} else if (ret == -EAGAIN) {
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atomic_fetch_add_explicit(&dropped, 1, memory_order_relaxed);
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if (logId == LOG_ID_SECURITY) {
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atomic_fetch_add_explicit(&droppedSecurity, 1,
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memory_order_relaxed);
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}
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}
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return ret;
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}
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