714 lines
20 KiB
C
714 lines
20 KiB
C
/*
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* Copyright (C) 2007-2014 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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#if (FAKE_LOG_DEVICE == 0)
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#include <endian.h>
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#endif
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#include <errno.h>
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#include <fcntl.h>
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#if !defined(_WIN32)
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#include <pthread.h>
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#endif
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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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#if (FAKE_LOG_DEVICE == 0)
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#include <sys/socket.h>
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#include <sys/un.h>
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#endif
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#include <time.h>
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#include <unistd.h>
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#ifdef __BIONIC__
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#include <android/set_abort_message.h>
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#endif
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#include <log/event_tag_map.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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#define LOG_BUF_SIZE 1024
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#if FAKE_LOG_DEVICE
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/* This will be defined when building for the host. */
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#include "fake_log_device.h"
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#endif
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static int __write_to_log_init(log_id_t, struct iovec *vec, size_t nr);
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static int (*write_to_log)(log_id_t, struct iovec *vec, size_t nr) = __write_to_log_init;
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#ifndef __unused
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#define __unused __attribute__((__unused__))
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#endif
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#if !defined(_WIN32)
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static pthread_mutex_t log_init_lock = PTHREAD_MUTEX_INITIALIZER;
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static void lock()
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{
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/*
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* If we trigger a signal handler in the middle of locked activity and the
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* signal handler logs a message, we could get into a deadlock state.
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*/
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pthread_mutex_lock(&log_init_lock);
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}
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static int trylock()
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{
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return pthread_mutex_trylock(&log_init_lock);
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}
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static void unlock()
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{
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pthread_mutex_unlock(&log_init_lock);
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}
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#else /* !defined(_WIN32) */
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#define lock() ((void)0)
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#define trylock() (0) /* success */
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#define unlock() ((void)0)
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#endif /* !defined(_WIN32) */
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#if FAKE_LOG_DEVICE
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static int log_fds[(int)LOG_ID_MAX] = { -1, -1, -1, -1, -1, -1 };
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#else
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static int logd_fd = -1;
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static int pstore_fd = -1;
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#endif
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/*
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* This is used by the C++ code to decide if it should write logs through
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* the C code. Basically, if /dev/socket/logd is available, we're running in
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* the simulator rather than a desktop tool and want to use the device.
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*/
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static enum {
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kLogUninitialized, kLogNotAvailable, kLogAvailable
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} g_log_status = kLogUninitialized;
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int __android_log_dev_available(void)
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{
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if (g_log_status == kLogUninitialized) {
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if (access("/dev/socket/logdw", W_OK) == 0)
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g_log_status = kLogAvailable;
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else
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g_log_status = kLogNotAvailable;
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}
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return (g_log_status == kLogAvailable);
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}
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/* log_init_lock assumed */
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static int __write_to_log_initialize()
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{
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int i, ret = 0;
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#if FAKE_LOG_DEVICE
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for (i = 0; i < LOG_ID_MAX; i++) {
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char buf[sizeof("/dev/log_system")];
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snprintf(buf, sizeof(buf), "/dev/log_%s", android_log_id_to_name(i));
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log_fds[i] = fakeLogOpen(buf, O_WRONLY);
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}
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#else
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if (pstore_fd < 0) {
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pstore_fd = TEMP_FAILURE_RETRY(open("/dev/pmsg0", O_WRONLY));
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}
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if (logd_fd < 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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logd_fd = i;
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}
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}
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}
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#endif
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return ret;
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}
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static int __write_to_log_daemon(log_id_t log_id, struct iovec *vec, size_t nr)
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{
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ssize_t ret;
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#if FAKE_LOG_DEVICE
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int log_fd;
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if (/*(int)log_id >= 0 &&*/ (int)log_id < (int)LOG_ID_MAX) {
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log_fd = log_fds[(int)log_id];
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} else {
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return -EBADF;
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}
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do {
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ret = fakeLogWritev(log_fd, vec, nr);
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if (ret < 0) {
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ret = -errno;
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}
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} while (ret == -EINTR);
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#else
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static const unsigned header_length = 2;
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struct iovec newVec[nr + header_length];
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android_log_header_t header;
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android_pmsg_log_header_t pmsg_header;
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struct timespec ts;
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size_t i, payload_size;
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static uid_t last_uid = AID_ROOT; /* logd *always* starts up as AID_ROOT */
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static pid_t last_pid = (pid_t) -1;
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static atomic_int_fast32_t dropped;
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static atomic_int_fast32_t dropped_security;
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if (!nr) {
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return -EINVAL;
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}
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if (last_uid == AID_ROOT) { /* have we called to get the UID yet? */
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last_uid = getuid();
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}
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if (last_pid == (pid_t) -1) {
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last_pid = getpid();
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}
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if (log_id == LOG_ID_SECURITY) {
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if (vec[0].iov_len < 4) {
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return -EINVAL;
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}
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/* Matches clientHasLogCredentials() in logd */
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if ((last_uid != AID_SYSTEM) && (last_uid != AID_ROOT) && (last_uid != AID_LOG)) {
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uid_t uid = geteuid();
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if ((uid != AID_SYSTEM) && (uid != AID_ROOT) && (uid != AID_LOG)) {
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gid_t gid = getgid();
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if ((gid != AID_SYSTEM) && (gid != AID_ROOT) && (gid != AID_LOG)) {
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gid = getegid();
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if ((gid != AID_SYSTEM) && (gid != AID_ROOT) && (gid != AID_LOG)) {
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int num_groups;
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gid_t *groups;
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num_groups = getgroups(0, NULL);
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if (num_groups <= 0) {
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return -EPERM;
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}
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groups = calloc(num_groups, sizeof(gid_t));
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if (!groups) {
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return -ENOMEM;
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}
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num_groups = getgroups(num_groups, groups);
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while (num_groups > 0) {
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if (groups[num_groups - 1] == AID_LOG) {
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break;
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}
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--num_groups;
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}
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free(groups);
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if (num_groups <= 0) {
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return -EPERM;
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}
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}
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}
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}
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}
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if (!__android_log_security()) {
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atomic_store(&dropped_security, 0);
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return -EPERM;
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}
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} else if (log_id == LOG_ID_EVENTS) {
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static atomic_uintptr_t map;
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int ret;
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const char *tag;
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EventTagMap *m, *f;
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if (vec[0].iov_len < 4) {
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return -EINVAL;
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}
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tag = NULL;
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f = NULL;
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m = (EventTagMap *)atomic_load(&map);
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if (!m) {
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ret = trylock();
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m = (EventTagMap *)atomic_load(&map); /* trylock flush cache */
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if (!m) {
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m = android_openEventTagMap(EVENT_TAG_MAP_FILE);
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if (ret) { /* trylock failed, use local copy, mark for close */
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f = m;
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} else {
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if (!m) { /* One chance to open map file */
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m = (EventTagMap *)(uintptr_t)-1LL;
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}
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atomic_store(&map, (uintptr_t)m);
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}
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}
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if (!ret) { /* trylock succeeded, unlock */
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unlock();
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}
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}
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if (m && (m != (EventTagMap *)(uintptr_t)-1LL)) {
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tag = android_lookupEventTag(
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m,
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htole32(((uint32_t *)vec[0].iov_base)[0]));
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}
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ret = __android_log_is_loggable(ANDROID_LOG_INFO,
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tag,
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ANDROID_LOG_VERBOSE);
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if (f) { /* local copy marked for close */
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android_closeEventTagMap(f);
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}
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if (!ret) {
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return -EPERM;
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}
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} else {
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/* Validate the incoming tag, tag content can not split across iovec */
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char prio = ANDROID_LOG_VERBOSE;
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const char *tag = vec[0].iov_base;
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size_t len = vec[0].iov_len;
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if (!tag) {
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len = 0;
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}
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if (len > 0) {
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prio = *tag;
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if (len > 1) {
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--len;
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++tag;
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} else {
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len = vec[1].iov_len;
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tag = ((const char *)vec[1].iov_base);
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if (!tag) {
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len = 0;
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}
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}
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}
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/* tag must be nul terminated */
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if (strnlen(tag, len) >= len) {
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tag = NULL;
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}
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if (!__android_log_is_loggable(prio, tag, ANDROID_LOG_VERBOSE)) {
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return -EPERM;
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}
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}
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/*
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* struct {
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* // what we provide to pstore
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* android_pmsg_log_header_t pmsg_header;
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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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clock_gettime(android_log_clockid(), &ts);
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pmsg_header.magic = LOGGER_MAGIC;
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pmsg_header.len = sizeof(pmsg_header) + sizeof(header);
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pmsg_header.uid = last_uid;
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pmsg_header.pid = last_pid;
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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 *) &pmsg_header;
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newVec[0].iov_len = sizeof(pmsg_header);
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newVec[1].iov_base = (unsigned char *) &header;
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newVec[1].iov_len = sizeof(header);
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if (logd_fd > 0) {
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int32_t snapshot = atomic_exchange_explicit(&dropped_security, 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[2].iov_base = &buffer;
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newVec[2].iov_len = sizeof(buffer);
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ret = TEMP_FAILURE_RETRY(writev(logd_fd, newVec + 1, 2));
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if (ret != (ssize_t)(sizeof(header) + sizeof(buffer))) {
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atomic_fetch_add_explicit(&dropped_security, 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[2].iov_base = &buffer;
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newVec[2].iov_len = sizeof(buffer);
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ret = TEMP_FAILURE_RETRY(writev(logd_fd, newVec + 1, 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 = log_id;
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for (payload_size = 0, i = header_length; i < nr + header_length; i++) {
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newVec[i].iov_base = vec[i - header_length].iov_base;
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payload_size += newVec[i].iov_len = vec[i - header_length].iov_len;
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if (payload_size > LOGGER_ENTRY_MAX_PAYLOAD) {
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newVec[i].iov_len -= payload_size - 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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payload_size = LOGGER_ENTRY_MAX_PAYLOAD;
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break;
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}
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}
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pmsg_header.len += payload_size;
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if (pstore_fd >= 0) {
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TEMP_FAILURE_RETRY(writev(pstore_fd, newVec, i));
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}
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if (last_uid == AID_LOGD) { /* logd, after initialization and priv drop */
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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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if (logd_fd < 0) {
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return -EBADF;
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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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* To logd, we drop the pmsg_header
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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(logd_fd, newVec + 1, i - 1));
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if (ret < 0) {
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ret = -errno;
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if (ret == -ENOTCONN) {
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lock();
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close(logd_fd);
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logd_fd = -1;
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ret = __write_to_log_initialize();
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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(logd_fd, newVec + 1, i - 1));
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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 (log_id == LOG_ID_SECURITY) {
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atomic_fetch_add_explicit(&dropped_security, 1,
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memory_order_relaxed);
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}
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}
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#endif
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return ret;
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}
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#if FAKE_LOG_DEVICE
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static const char *LOG_NAME[LOG_ID_MAX] = {
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[LOG_ID_MAIN] = "main",
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[LOG_ID_RADIO] = "radio",
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[LOG_ID_EVENTS] = "events",
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[LOG_ID_SYSTEM] = "system",
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[LOG_ID_CRASH] = "crash",
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[LOG_ID_SECURITY] = "security",
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[LOG_ID_KERNEL] = "kernel",
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};
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const char *android_log_id_to_name(log_id_t log_id)
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{
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if (log_id >= LOG_ID_MAX) {
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log_id = LOG_ID_MAIN;
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}
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return LOG_NAME[log_id];
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}
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#endif
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static int __write_to_log_init(log_id_t log_id, struct iovec *vec, size_t nr)
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{
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lock();
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if (write_to_log == __write_to_log_init) {
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int ret;
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ret = __write_to_log_initialize();
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if (ret < 0) {
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unlock();
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#if (FAKE_LOG_DEVICE == 0)
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if (pstore_fd >= 0) {
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__write_to_log_daemon(log_id, vec, nr);
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}
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#endif
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return ret;
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}
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write_to_log = __write_to_log_daemon;
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}
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unlock();
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return write_to_log(log_id, vec, nr);
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}
|
|
|
|
int __android_log_write(int prio, const char *tag, const char *msg)
|
|
{
|
|
return __android_log_buf_write(LOG_ID_MAIN, prio, tag, msg);
|
|
}
|
|
|
|
int __android_log_buf_write(int bufID, int prio, const char *tag, const char *msg)
|
|
{
|
|
struct iovec vec[3];
|
|
char tmp_tag[32];
|
|
|
|
if (!tag)
|
|
tag = "";
|
|
|
|
/* XXX: This needs to go! */
|
|
if ((bufID != LOG_ID_RADIO) &&
|
|
(!strcmp(tag, "HTC_RIL") ||
|
|
!strncmp(tag, "RIL", 3) || /* Any log tag with "RIL" as the prefix */
|
|
!strncmp(tag, "IMS", 3) || /* Any log tag with "IMS" as the prefix */
|
|
!strcmp(tag, "AT") ||
|
|
!strcmp(tag, "GSM") ||
|
|
!strcmp(tag, "STK") ||
|
|
!strcmp(tag, "CDMA") ||
|
|
!strcmp(tag, "PHONE") ||
|
|
!strcmp(tag, "SMS"))) {
|
|
bufID = LOG_ID_RADIO;
|
|
/* Inform third party apps/ril/radio.. to use Rlog or RLOG */
|
|
snprintf(tmp_tag, sizeof(tmp_tag), "use-Rlog/RLOG-%s", tag);
|
|
tag = tmp_tag;
|
|
}
|
|
|
|
#if __BIONIC__
|
|
if (prio == ANDROID_LOG_FATAL) {
|
|
android_set_abort_message(msg);
|
|
}
|
|
#endif
|
|
|
|
vec[0].iov_base = (unsigned char *) &prio;
|
|
vec[0].iov_len = 1;
|
|
vec[1].iov_base = (void *) tag;
|
|
vec[1].iov_len = strlen(tag) + 1;
|
|
vec[2].iov_base = (void *) msg;
|
|
vec[2].iov_len = strlen(msg) + 1;
|
|
|
|
return write_to_log(bufID, vec, 3);
|
|
}
|
|
|
|
int __android_log_vprint(int prio, const char *tag, const char *fmt, va_list ap)
|
|
{
|
|
char buf[LOG_BUF_SIZE];
|
|
|
|
vsnprintf(buf, LOG_BUF_SIZE, fmt, ap);
|
|
|
|
return __android_log_write(prio, tag, buf);
|
|
}
|
|
|
|
int __android_log_print(int prio, const char *tag, const char *fmt, ...)
|
|
{
|
|
va_list ap;
|
|
char buf[LOG_BUF_SIZE];
|
|
|
|
va_start(ap, fmt);
|
|
vsnprintf(buf, LOG_BUF_SIZE, fmt, ap);
|
|
va_end(ap);
|
|
|
|
return __android_log_write(prio, tag, buf);
|
|
}
|
|
|
|
int __android_log_buf_print(int bufID, int prio, const char *tag, const char *fmt, ...)
|
|
{
|
|
va_list ap;
|
|
char buf[LOG_BUF_SIZE];
|
|
|
|
va_start(ap, fmt);
|
|
vsnprintf(buf, LOG_BUF_SIZE, fmt, ap);
|
|
va_end(ap);
|
|
|
|
return __android_log_buf_write(bufID, prio, tag, buf);
|
|
}
|
|
|
|
void __android_log_assert(const char *cond, const char *tag,
|
|
const char *fmt, ...)
|
|
{
|
|
char buf[LOG_BUF_SIZE];
|
|
|
|
if (fmt) {
|
|
va_list ap;
|
|
va_start(ap, fmt);
|
|
vsnprintf(buf, LOG_BUF_SIZE, fmt, ap);
|
|
va_end(ap);
|
|
} else {
|
|
/* Msg not provided, log condition. N.B. Do not use cond directly as
|
|
* format string as it could contain spurious '%' syntax (e.g.
|
|
* "%d" in "blocks%devs == 0").
|
|
*/
|
|
if (cond)
|
|
snprintf(buf, LOG_BUF_SIZE, "Assertion failed: %s", cond);
|
|
else
|
|
strcpy(buf, "Unspecified assertion failed");
|
|
}
|
|
|
|
__android_log_write(ANDROID_LOG_FATAL, tag, buf);
|
|
abort(); /* abort so we have a chance to debug the situation */
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
int __android_log_bwrite(int32_t tag, const void *payload, size_t len)
|
|
{
|
|
struct iovec vec[2];
|
|
|
|
vec[0].iov_base = &tag;
|
|
vec[0].iov_len = sizeof(tag);
|
|
vec[1].iov_base = (void*)payload;
|
|
vec[1].iov_len = len;
|
|
|
|
return write_to_log(LOG_ID_EVENTS, vec, 2);
|
|
}
|
|
|
|
int __android_log_security_bwrite(int32_t tag, const void *payload, size_t len)
|
|
{
|
|
struct iovec vec[2];
|
|
|
|
vec[0].iov_base = &tag;
|
|
vec[0].iov_len = sizeof(tag);
|
|
vec[1].iov_base = (void*)payload;
|
|
vec[1].iov_len = len;
|
|
|
|
return write_to_log(LOG_ID_SECURITY, vec, 2);
|
|
}
|
|
|
|
/*
|
|
* Like __android_log_bwrite, but takes the type as well. Doesn't work
|
|
* for the general case where we're generating lists of stuff, but very
|
|
* handy if we just want to dump an integer into the log.
|
|
*/
|
|
int __android_log_btwrite(int32_t tag, char type, const void *payload,
|
|
size_t len)
|
|
{
|
|
struct iovec vec[3];
|
|
|
|
vec[0].iov_base = &tag;
|
|
vec[0].iov_len = sizeof(tag);
|
|
vec[1].iov_base = &type;
|
|
vec[1].iov_len = sizeof(type);
|
|
vec[2].iov_base = (void*)payload;
|
|
vec[2].iov_len = len;
|
|
|
|
return write_to_log(LOG_ID_EVENTS, vec, 3);
|
|
}
|
|
|
|
/*
|
|
* Like __android_log_bwrite, but used for writing strings to the
|
|
* event log.
|
|
*/
|
|
int __android_log_bswrite(int32_t tag, const char *payload)
|
|
{
|
|
struct iovec vec[4];
|
|
char type = EVENT_TYPE_STRING;
|
|
uint32_t len = strlen(payload);
|
|
|
|
vec[0].iov_base = &tag;
|
|
vec[0].iov_len = sizeof(tag);
|
|
vec[1].iov_base = &type;
|
|
vec[1].iov_len = sizeof(type);
|
|
vec[2].iov_base = &len;
|
|
vec[2].iov_len = sizeof(len);
|
|
vec[3].iov_base = (void*)payload;
|
|
vec[3].iov_len = len;
|
|
|
|
return write_to_log(LOG_ID_EVENTS, vec, 4);
|
|
}
|
|
|
|
/*
|
|
* Like __android_log_security_bwrite, but used for writing strings to the
|
|
* security log.
|
|
*/
|
|
int __android_log_security_bswrite(int32_t tag, const char *payload)
|
|
{
|
|
struct iovec vec[4];
|
|
char type = EVENT_TYPE_STRING;
|
|
uint32_t len = strlen(payload);
|
|
|
|
vec[0].iov_base = &tag;
|
|
vec[0].iov_len = sizeof(tag);
|
|
vec[1].iov_base = &type;
|
|
vec[1].iov_len = sizeof(type);
|
|
vec[2].iov_base = &len;
|
|
vec[2].iov_len = sizeof(len);
|
|
vec[3].iov_base = (void*)payload;
|
|
vec[3].iov_len = len;
|
|
|
|
return write_to_log(LOG_ID_SECURITY, vec, 4);
|
|
}
|