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platform_system_core/liblog/log_read.c

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/*
** Copyright 2013-2014, The Android Open Source Project
**
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
**
** http://www.apache.org/licenses/LICENSE-2.0
**
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
*/
#include <errno.h>
#include <fcntl.h>
#include <inttypes.h>
#include <poll.h>
#include <signal.h>
#include <stdbool.h>
#include <stddef.h>
#define NOMINMAX /* for windows to suppress definition of min in stdlib.h */
#include <stdlib.h>
#include <string.h>
#include <sys/cdefs.h>
#include <unistd.h>
#include <cutils/list.h>
#include <cutils/sockets.h>
#include <log/log.h>
#include <log/logger.h>
#include <private/android_filesystem_config.h>
#include <private/android_logger.h>
/* branchless on many architectures. */
#define min(x,y) ((y) ^ (((x) ^ (y)) & -((x) < (y))))
#if defined(_WIN32)
#define WEAK static
#else
#define WEAK __attribute__((weak))
#endif
#ifndef __unused
#define __unused __attribute__((unused))
#endif
/* Private copy of ../libcutils/socket_local_client.c prevent library loops */
#if defined(_WIN32)
int WEAK socket_local_client(const char *name, int namespaceId, int type)
{
errno = ENOSYS;
return -ENOSYS;
}
#else /* !_WIN32 */
#include <sys/socket.h>
#include <sys/un.h>
#include <sys/select.h>
#include <sys/types.h>
/* Private copy of ../libcutils/socket_local.h prevent library loops */
#define FILESYSTEM_SOCKET_PREFIX "/tmp/"
#define ANDROID_RESERVED_SOCKET_PREFIX "/dev/socket/"
/* End of ../libcutils/socket_local.h */
#define LISTEN_BACKLOG 4
/* Documented in header file. */
int WEAK socket_make_sockaddr_un(const char *name, int namespaceId,
struct sockaddr_un *p_addr, socklen_t *alen)
{
memset (p_addr, 0, sizeof (*p_addr));
size_t namelen;
switch (namespaceId) {
case ANDROID_SOCKET_NAMESPACE_ABSTRACT:
#if defined(__linux__)
namelen = strlen(name);
/* Test with length +1 for the *initial* '\0'. */
if ((namelen + 1) > sizeof(p_addr->sun_path)) {
goto error;
}
/*
* Note: The path in this case is *not* supposed to be
* '\0'-terminated. ("man 7 unix" for the gory details.)
*/
p_addr->sun_path[0] = 0;
memcpy(p_addr->sun_path + 1, name, namelen);
#else
/* this OS doesn't have the Linux abstract namespace */
namelen = strlen(name) + strlen(FILESYSTEM_SOCKET_PREFIX);
/* unix_path_max appears to be missing on linux */
if (namelen > sizeof(*p_addr)
- offsetof(struct sockaddr_un, sun_path) - 1) {
goto error;
}
strcpy(p_addr->sun_path, FILESYSTEM_SOCKET_PREFIX);
strcat(p_addr->sun_path, name);
#endif
break;
case ANDROID_SOCKET_NAMESPACE_RESERVED:
namelen = strlen(name) + strlen(ANDROID_RESERVED_SOCKET_PREFIX);
/* unix_path_max appears to be missing on linux */
if (namelen > sizeof(*p_addr)
- offsetof(struct sockaddr_un, sun_path) - 1) {
goto error;
}
strcpy(p_addr->sun_path, ANDROID_RESERVED_SOCKET_PREFIX);
strcat(p_addr->sun_path, name);
break;
case ANDROID_SOCKET_NAMESPACE_FILESYSTEM:
namelen = strlen(name);
/* unix_path_max appears to be missing on linux */
if (namelen > sizeof(*p_addr)
- offsetof(struct sockaddr_un, sun_path) - 1) {
goto error;
}
strcpy(p_addr->sun_path, name);
break;
default:
/* invalid namespace id */
return -1;
}
p_addr->sun_family = AF_LOCAL;
*alen = namelen + offsetof(struct sockaddr_un, sun_path) + 1;
return 0;
error:
return -1;
}
/**
* connect to peer named "name" on fd
* returns same fd or -1 on error.
* fd is not closed on error. that's your job.
*
* Used by AndroidSocketImpl
*/
int WEAK socket_local_client_connect(int fd, const char *name, int namespaceId,
int type __unused)
{
struct sockaddr_un addr;
socklen_t alen;
int err;
err = socket_make_sockaddr_un(name, namespaceId, &addr, &alen);
if (err < 0) {
goto error;
}
if(connect(fd, (struct sockaddr *) &addr, alen) < 0) {
goto error;
}
return fd;
error:
return -1;
}
/**
* connect to peer named "name"
* returns fd or -1 on error
*/
int WEAK socket_local_client(const char *name, int namespaceId, int type)
{
int s;
s = socket(AF_LOCAL, type, 0);
if(s < 0) return -1;
if ( 0 > socket_local_client_connect(s, name, namespaceId, type)) {
close(s);
return -1;
}
return s;
}
#endif /* !_WIN32 */
/* End of ../libcutils/socket_local_client.c */
#define logger_for_each(logger, logger_list) \
for (logger = node_to_item((logger_list)->node.next, struct logger, node); \
logger != node_to_item(&(logger_list)->node, struct logger, node); \
logger = node_to_item((logger)->node.next, struct logger, node))
/* In the future, we would like to make this list extensible */
static const char *LOG_NAME[LOG_ID_MAX] = {
[LOG_ID_MAIN] = "main",
[LOG_ID_RADIO] = "radio",
[LOG_ID_EVENTS] = "events",
[LOG_ID_SYSTEM] = "system",
[LOG_ID_CRASH] = "crash",
[LOG_ID_KERNEL] = "kernel",
};
const char *android_log_id_to_name(log_id_t log_id)
{
if (log_id >= LOG_ID_MAX) {
log_id = LOG_ID_MAIN;
}
return LOG_NAME[log_id];
}
log_id_t android_name_to_log_id(const char *logName)
{
const char *b;
int ret;
if (!logName) {
return -1; /* NB: log_id_t is unsigned */
}
b = strrchr(logName, '/');
if (!b) {
b = logName;
} else {
++b;
}
for(ret = LOG_ID_MIN; ret < LOG_ID_MAX; ++ret) {
const char *l = LOG_NAME[ret];
if (l && !strcmp(b, l)) {
return ret;
}
}
return -1; /* should never happen */
}
struct logger_list {
struct listnode node;
int mode;
unsigned int tail;
log_time start;
pid_t pid;
int sock;
};
struct logger {
struct listnode node;
struct logger_list *top;
log_id_t id;
};
/* android_logger_alloc unimplemented, no use case */
/* android_logger_free not exported */
static void android_logger_free(struct logger *logger)
{
if (!logger) {
return;
}
list_remove(&logger->node);
free(logger);
}
/* android_logger_alloc unimplemented, no use case */
/* method for getting the associated sublog id */
log_id_t android_logger_get_id(struct logger *logger)
{
return logger->id;
}
/* worker for sending the command to the logger */
static ssize_t send_log_msg(struct logger *logger,
const char *msg, char *buf, size_t buf_size)
{
ssize_t ret;
size_t len;
char *cp;
int errno_save = 0;
int sock = socket_local_client("logd", ANDROID_SOCKET_NAMESPACE_RESERVED,
SOCK_STREAM);
if (sock < 0) {
return sock;
}
if (msg) {
snprintf(buf, buf_size, msg, logger ? logger->id : (unsigned) -1);
}
len = strlen(buf) + 1;
ret = TEMP_FAILURE_RETRY(write(sock, buf, len));
if (ret <= 0) {
goto done;
}
len = buf_size;
cp = buf;
while ((ret = TEMP_FAILURE_RETRY(read(sock, cp, len))) > 0) {
struct pollfd p;
if (((size_t)ret == len) || (buf_size < PAGE_SIZE)) {
break;
}
len -= ret;
cp += ret;
memset(&p, 0, sizeof(p));
p.fd = sock;
p.events = POLLIN;
/* Give other side 20ms to refill pipe */
ret = TEMP_FAILURE_RETRY(poll(&p, 1, 20));
if (ret <= 0) {
break;
}
if (!(p.revents & POLLIN)) {
ret = 0;
break;
}
}
if (ret >= 0) {
ret += buf_size - len;
}
done:
if ((ret == -1) && errno) {
errno_save = errno;
}
close(sock);
if (errno_save) {
errno = errno_save;
}
return ret;
}
static int check_log_success(char *buf, ssize_t ret)
{
if (ret < 0) {
return ret;
}
if (strncmp(buf, "success", 7)) {
errno = EINVAL;
return -1;
}
return 0;
}
/* Determine the credentials of the caller */
static bool uid_has_log_permission(uid_t uid)
{
return (uid == AID_SYSTEM) || (uid == AID_LOG) || (uid == AID_ROOT);
}
static uid_t get_best_effective_uid()
{
uid_t euid;
uid_t uid;
gid_t gid;
ssize_t i;
static uid_t last_uid = (uid_t) -1;
if (last_uid != (uid_t) -1) {
return last_uid;
}
uid = getuid();
if (uid_has_log_permission(uid)) {
return last_uid = uid;
}
euid = geteuid();
if (uid_has_log_permission(euid)) {
return last_uid = euid;
}
gid = getgid();
if (uid_has_log_permission(gid)) {
return last_uid = gid;
}
gid = getegid();
if (uid_has_log_permission(gid)) {
return last_uid = gid;
}
i = getgroups((size_t) 0, NULL);
if (i > 0) {
gid_t list[i];
getgroups(i, list);
while (--i >= 0) {
if (uid_has_log_permission(list[i])) {
return last_uid = list[i];
}
}
}
return last_uid = uid;
}
int android_logger_clear(struct logger *logger)
{
char buf[512];
if (logger->top->mode & ANDROID_LOG_PSTORE) {
if (uid_has_log_permission(get_best_effective_uid())) {
return unlink("/sys/fs/pstore/pmsg-ramoops-0");
}
errno = EPERM;
return -1;
}
return check_log_success(buf,
send_log_msg(logger, "clear %d", buf, sizeof(buf)));
}
/* returns the total size of the log's ring buffer */
long android_logger_get_log_size(struct logger *logger)
{
char buf[512];
ssize_t ret = send_log_msg(logger, "getLogSize %d", buf, sizeof(buf));
if (ret < 0) {
return ret;
}
if ((buf[0] < '0') || ('9' < buf[0])) {
return -1;
}
return atol(buf);
}
int android_logger_set_log_size(struct logger *logger, unsigned long size)
{
char buf[512];
snprintf(buf, sizeof(buf), "setLogSize %d %lu",
logger ? logger->id : (unsigned) -1, size);
return check_log_success(buf, send_log_msg(NULL, NULL, buf, sizeof(buf)));
}
/*
* returns the readable size of the log's ring buffer (that is, amount of the
* log consumed)
*/
long android_logger_get_log_readable_size(struct logger *logger)
{
char buf[512];
ssize_t ret = send_log_msg(logger, "getLogSizeUsed %d", buf, sizeof(buf));
if (ret < 0) {
return ret;
}
if ((buf[0] < '0') || ('9' < buf[0])) {
return -1;
}
return atol(buf);
}
/*
* returns the logger version
*/
int android_logger_get_log_version(struct logger *logger __unused)
{
return 3;
}
/*
* returns statistics
*/
ssize_t android_logger_get_statistics(struct logger_list *logger_list,
char *buf, size_t len)
{
struct logger *logger;
char *cp = buf;
size_t remaining = len;
size_t n;
n = snprintf(cp, remaining, "getStatistics");
n = min(n, remaining);
remaining -= n;
cp += n;
logger_for_each(logger, logger_list) {
n = snprintf(cp, remaining, " %d", logger->id);
n = min(n, remaining);
remaining -= n;
cp += n;
}
return send_log_msg(NULL, NULL, buf, len);
}
ssize_t android_logger_get_prune_list(struct logger_list *logger_list __unused,
char *buf, size_t len)
{
return send_log_msg(NULL, "getPruneList", buf, len);
}
int android_logger_set_prune_list(struct logger_list *logger_list __unused,
char *buf, size_t len)
{
const char cmd[] = "setPruneList ";
const size_t cmdlen = sizeof(cmd) - 1;
if (strlen(buf) > (len - cmdlen)) {
return -ENOMEM; /* KISS */
}
memmove(buf + cmdlen, buf, len - cmdlen);
buf[len - 1] = '\0';
memcpy(buf, cmd, cmdlen);
return check_log_success(buf, send_log_msg(NULL, NULL, buf, len));
}
struct logger_list *android_logger_list_alloc(int mode,
unsigned int tail,
pid_t pid)
{
struct logger_list *logger_list;
logger_list = calloc(1, sizeof(*logger_list));
if (!logger_list) {
return NULL;
}
list_init(&logger_list->node);
logger_list->mode = mode;
logger_list->start.tv_sec = 0;
logger_list->start.tv_nsec = 0;
logger_list->tail = tail;
logger_list->pid = pid;
logger_list->sock = -1;
return logger_list;
}
struct logger_list *android_logger_list_alloc_time(int mode,
log_time start,
pid_t pid)
{
struct logger_list *logger_list;
logger_list = calloc(1, sizeof(*logger_list));
if (!logger_list) {
return NULL;
}
list_init(&logger_list->node);
logger_list->mode = mode;
logger_list->start = start;
logger_list->tail = 0;
logger_list->pid = pid;
logger_list->sock = -1;
return logger_list;
}
/* android_logger_list_register unimplemented, no use case */
/* android_logger_list_unregister unimplemented, no use case */
/* Open the named log and add it to the logger list */
struct logger *android_logger_open(struct logger_list *logger_list,
log_id_t id)
{
struct logger *logger;
if (!logger_list || (id >= LOG_ID_MAX)) {
goto err;
}
logger_for_each(logger, logger_list) {
if (logger->id == id) {
goto ok;
}
}
logger = calloc(1, sizeof(*logger));
if (!logger) {
goto err;
}
logger->id = id;
list_add_tail(&logger_list->node, &logger->node);
logger->top = logger_list;
goto ok;
err:
logger = NULL;
ok:
return logger;
}
/* Open the single named log and make it part of a new logger list */
struct logger_list *android_logger_list_open(log_id_t id,
int mode,
unsigned int tail,
pid_t pid)
{
struct logger_list *logger_list = android_logger_list_alloc(mode, tail, pid);
if (!logger_list) {
return NULL;
}
if (!android_logger_open(logger_list, id)) {
android_logger_list_free(logger_list);
return NULL;
}
return logger_list;
}
static int android_logger_list_read_pstore(struct logger_list *logger_list,
struct log_msg *log_msg)
{
ssize_t ret;
off_t current, next;
uid_t uid;
struct logger *logger;
struct __attribute__((__packed__)) {
android_pmsg_log_header_t p;
android_log_header_t l;
} buf;
static uint8_t preread_count;
memset(log_msg, 0, sizeof(*log_msg));
if (logger_list->sock < 0) {
int fd = open("/sys/fs/pstore/pmsg-ramoops-0", O_RDONLY);
if (fd < 0) {
return -errno;
}
logger_list->sock = fd;
preread_count = 0;
}
ret = 0;
while(1) {
if (preread_count < sizeof(buf)) {
ret = TEMP_FAILURE_RETRY(read(logger_list->sock,
&buf.p.magic + preread_count,
sizeof(buf) - preread_count));
if (ret < 0) {
return -errno;
}
preread_count += ret;
}
if (preread_count != sizeof(buf)) {
return preread_count ? -EIO : -EAGAIN;
}
if ((buf.p.magic != LOGGER_MAGIC)
|| (buf.p.len <= sizeof(buf))
|| (buf.p.len > (sizeof(buf) + LOGGER_ENTRY_MAX_PAYLOAD))
|| (buf.l.id >= LOG_ID_MAX)
|| (buf.l.realtime.tv_nsec >= NS_PER_SEC)) {
do {
memmove(&buf.p.magic, &buf.p.magic + 1, --preread_count);
} while (preread_count && (buf.p.magic != LOGGER_MAGIC));
continue;
}
preread_count = 0;
logger_for_each(logger, logger_list) {
if (buf.l.id != logger->id) {
continue;
}
if ((logger_list->start.tv_sec || logger_list->start.tv_nsec)
&& ((logger_list->start.tv_sec > buf.l.realtime.tv_sec)
|| ((logger_list->start.tv_sec == buf.l.realtime.tv_sec)
&& (logger_list->start.tv_nsec > buf.l.realtime.tv_nsec)))) {
break;
}
if (logger_list->pid && (logger_list->pid != buf.p.pid)) {
break;
}
uid = get_best_effective_uid();
if (!uid_has_log_permission(uid) && (uid != buf.p.uid)) {
break;
}
ret = TEMP_FAILURE_RETRY(read(logger_list->sock,
log_msg->entry_v3.msg,
buf.p.len - sizeof(buf)));
if (ret < 0) {
return -errno;
}
if (ret != (ssize_t)(buf.p.len - sizeof(buf))) {
return -EIO;
}
log_msg->entry_v3.len = buf.p.len - sizeof(buf);
log_msg->entry_v3.hdr_size = sizeof(log_msg->entry_v3);
log_msg->entry_v3.pid = buf.p.pid;
log_msg->entry_v3.tid = buf.l.tid;
log_msg->entry_v3.sec = buf.l.realtime.tv_sec;
log_msg->entry_v3.nsec = buf.l.realtime.tv_nsec;
log_msg->entry_v3.lid = buf.l.id;
return ret;
}
current = TEMP_FAILURE_RETRY(lseek(logger_list->sock,
(off_t)0, SEEK_CUR));
if (current < 0) {
return -errno;
}
next = TEMP_FAILURE_RETRY(lseek(logger_list->sock,
(off_t)(buf.p.len - sizeof(buf)),
SEEK_CUR));
if (next < 0) {
return -errno;
}
if ((next - current) != (ssize_t)(buf.p.len - sizeof(buf))) {
return -EIO;
}
}
}
static void caught_signal(int signum __unused)
{
}
/* Read from the selected logs */
int android_logger_list_read(struct logger_list *logger_list,
struct log_msg *log_msg)
{
int ret, e;
struct logger *logger;
struct sigaction ignore;
struct sigaction old_sigaction;
unsigned int old_alarm = 0;
if (!logger_list) {
return -EINVAL;
}
if (logger_list->mode & ANDROID_LOG_PSTORE) {
return android_logger_list_read_pstore(logger_list, log_msg);
}
if (logger_list->mode & ANDROID_LOG_NONBLOCK) {
memset(&ignore, 0, sizeof(ignore));
ignore.sa_handler = caught_signal;
sigemptyset(&ignore.sa_mask);
}
if (logger_list->sock < 0) {
char buffer[256], *cp, c;
int sock = socket_local_client("logdr",
ANDROID_SOCKET_NAMESPACE_RESERVED,
SOCK_SEQPACKET);
if (sock < 0) {
if ((sock == -1) && errno) {
return -errno;
}
return sock;
}
strcpy(buffer,
(logger_list->mode & ANDROID_LOG_NONBLOCK) ? "dumpAndClose" : "stream");
cp = buffer + strlen(buffer);
strcpy(cp, " lids");
cp += 5;
c = '=';
int remaining = sizeof(buffer) - (cp - buffer);
logger_for_each(logger, logger_list) {
ret = snprintf(cp, remaining, "%c%u", c, logger->id);
ret = min(ret, remaining);
remaining -= ret;
cp += ret;
c = ',';
}
if (logger_list->tail) {
ret = snprintf(cp, remaining, " tail=%u", logger_list->tail);
ret = min(ret, remaining);
remaining -= ret;
cp += ret;
}
if (logger_list->start.tv_sec || logger_list->start.tv_nsec) {
ret = snprintf(cp, remaining, " start=%" PRIu32 ".%09" PRIu32,
logger_list->start.tv_sec,
logger_list->start.tv_nsec);
ret = min(ret, remaining);
remaining -= ret;
cp += ret;
}
if (logger_list->pid) {
ret = snprintf(cp, remaining, " pid=%u", logger_list->pid);
ret = min(ret, remaining);
remaining -= ret;
cp += ret;
}
if (logger_list->mode & ANDROID_LOG_NONBLOCK) {
/* Deal with an unresponsive logd */
sigaction(SIGALRM, &ignore, &old_sigaction);
old_alarm = alarm(30);
}
ret = write(sock, buffer, cp - buffer);
e = errno;
if (logger_list->mode & ANDROID_LOG_NONBLOCK) {
if (e == EINTR) {
e = ETIMEDOUT;
}
alarm(old_alarm);
sigaction(SIGALRM, &old_sigaction, NULL);
}
if (ret <= 0) {
close(sock);
if ((ret == -1) && e) {
return -e;
}
if (ret == 0) {
return -EIO;
}
return ret;
}
logger_list->sock = sock;
}
ret = 0;
while(1) {
memset(log_msg, 0, sizeof(*log_msg));
if (logger_list->mode & ANDROID_LOG_NONBLOCK) {
/* particularily useful if tombstone is reporting for logd */
sigaction(SIGALRM, &ignore, &old_sigaction);
old_alarm = alarm(30);
}
/* NOTE: SOCK_SEQPACKET guarantees we read exactly one full entry */
ret = recv(logger_list->sock, log_msg, LOGGER_ENTRY_MAX_LEN, 0);
e = errno;
if (logger_list->mode & ANDROID_LOG_NONBLOCK) {
if ((ret == 0) || (e == EINTR)) {
e = EAGAIN;
ret = -1;
}
alarm(old_alarm);
sigaction(SIGALRM, &old_sigaction, NULL);
}
if (ret <= 0) {
if ((ret == -1) && e) {
return -e;
}
return ret;
}
logger_for_each(logger, logger_list) {
if (log_msg->entry.lid == logger->id) {
return ret;
}
}
}
/* NOTREACH */
return ret;
}
/* Close all the logs */
void android_logger_list_free(struct logger_list *logger_list)
{
if (logger_list == NULL) {
return;
}
while (!list_empty(&logger_list->node)) {
struct listnode *node = list_head(&logger_list->node);
struct logger *logger = node_to_item(node, struct logger, node);
android_logger_free(logger);
}
if (logger_list->sock >= 0) {
close (logger_list->sock);
}
free(logger_list);
}
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