| /* |
| * Copyright (C) 2007-2014 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. |
| */ |
| #if (FAKE_LOG_DEVICE == 0) |
| #include <endian.h> |
| #endif |
| #include <errno.h> |
| #include <fcntl.h> |
| #if !defined(_WIN32) |
| #include <pthread.h> |
| #endif |
| #include <stdarg.h> |
| #include <stdatomic.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <sys/stat.h> |
| #include <sys/types.h> |
| #if (FAKE_LOG_DEVICE == 0) |
| #include <sys/socket.h> |
| #include <sys/un.h> |
| #endif |
| #include <time.h> |
| #include <unistd.h> |
| |
| #ifdef __BIONIC__ |
| #include <android/set_abort_message.h> |
| #endif |
| |
| #include <log/event_tag_map.h> |
| #include <log/logd.h> |
| #include <log/logger.h> |
| #include <log/log_read.h> |
| #include <private/android_filesystem_config.h> |
| #include <private/android_logger.h> |
| |
| #define LOG_BUF_SIZE 1024 |
| |
| #if FAKE_LOG_DEVICE |
| /* This will be defined when building for the host. */ |
| #include "fake_log_device.h" |
| #endif |
| |
| static int __write_to_log_init(log_id_t, struct iovec *vec, size_t nr); |
| static int (*write_to_log)(log_id_t, struct iovec *vec, size_t nr) = __write_to_log_init; |
| |
| #ifndef __unused |
| #define __unused __attribute__((__unused__)) |
| #endif |
| |
| #if !defined(_WIN32) |
| static pthread_mutex_t log_init_lock = PTHREAD_MUTEX_INITIALIZER; |
| |
| static void lock() |
| { |
| /* |
| * If we trigger a signal handler in the middle of locked activity and the |
| * signal handler logs a message, we could get into a deadlock state. |
| */ |
| pthread_mutex_lock(&log_init_lock); |
| } |
| |
| static int trylock() |
| { |
| return pthread_mutex_trylock(&log_init_lock); |
| } |
| |
| static void unlock() |
| { |
| pthread_mutex_unlock(&log_init_lock); |
| } |
| |
| #else /* !defined(_WIN32) */ |
| |
| #define lock() ((void)0) |
| #define trylock() (0) /* success */ |
| #define unlock() ((void)0) |
| |
| #endif /* !defined(_WIN32) */ |
| |
| #if FAKE_LOG_DEVICE |
| static int log_fds[(int)LOG_ID_MAX] = { -1, -1, -1, -1, -1, -1 }; |
| #else |
| static int logd_fd = -1; |
| static int pstore_fd = -1; |
| #endif |
| |
| /* |
| * This is used by the C++ code to decide if it should write logs through |
| * the C code. Basically, if /dev/socket/logd is available, we're running in |
| * the simulator rather than a desktop tool and want to use the device. |
| */ |
| static enum { |
| kLogUninitialized, kLogNotAvailable, kLogAvailable |
| } g_log_status = kLogUninitialized; |
| |
| int __android_log_dev_available(void) |
| { |
| if (g_log_status == kLogUninitialized) { |
| if (access("/dev/socket/logdw", W_OK) == 0) |
| g_log_status = kLogAvailable; |
| else |
| g_log_status = kLogNotAvailable; |
| } |
| |
| return (g_log_status == kLogAvailable); |
| } |
| |
| /* log_init_lock assumed */ |
| static int __write_to_log_initialize() |
| { |
| int i, ret = 0; |
| |
| #if FAKE_LOG_DEVICE |
| for (i = 0; i < LOG_ID_MAX; i++) { |
| char buf[sizeof("/dev/log_security")]; |
| snprintf(buf, sizeof(buf), "/dev/log_%s", android_log_id_to_name(i)); |
| log_fds[i] = fakeLogOpen(buf, O_WRONLY); |
| } |
| #else |
| if (pstore_fd < 0) { |
| pstore_fd = TEMP_FAILURE_RETRY(open("/dev/pmsg0", O_WRONLY)); |
| } |
| |
| if (logd_fd < 0) { |
| i = TEMP_FAILURE_RETRY(socket(PF_UNIX, SOCK_DGRAM | SOCK_CLOEXEC, 0)); |
| if (i < 0) { |
| ret = -errno; |
| } else if (TEMP_FAILURE_RETRY(fcntl(i, F_SETFL, O_NONBLOCK)) < 0) { |
| ret = -errno; |
| close(i); |
| } else { |
| struct sockaddr_un un; |
| memset(&un, 0, sizeof(struct sockaddr_un)); |
| un.sun_family = AF_UNIX; |
| strcpy(un.sun_path, "/dev/socket/logdw"); |
| |
| if (TEMP_FAILURE_RETRY(connect(i, (struct sockaddr *)&un, |
| sizeof(struct sockaddr_un))) < 0) { |
| ret = -errno; |
| close(i); |
| } else { |
| logd_fd = i; |
| } |
| } |
| } |
| #endif |
| |
| return ret; |
| } |
| |
| static int __write_to_log_daemon(log_id_t log_id, struct iovec *vec, size_t nr) |
| { |
| ssize_t ret; |
| #if FAKE_LOG_DEVICE |
| int log_fd; |
| |
| if (/*(int)log_id >= 0 &&*/ (int)log_id < (int)LOG_ID_MAX) { |
| log_fd = log_fds[(int)log_id]; |
| } else { |
| return -EBADF; |
| } |
| do { |
| ret = fakeLogWritev(log_fd, vec, nr); |
| if (ret < 0) { |
| ret = -errno; |
| } |
| } while (ret == -EINTR); |
| #else |
| static const unsigned header_length = 2; |
| struct iovec newVec[nr + header_length]; |
| android_log_header_t header; |
| android_pmsg_log_header_t pmsg_header; |
| struct timespec ts; |
| size_t i, payload_size; |
| static uid_t last_uid = AID_ROOT; /* logd *always* starts up as AID_ROOT */ |
| static pid_t last_pid = (pid_t) -1; |
| static atomic_int_fast32_t dropped; |
| static atomic_int_fast32_t dropped_security; |
| |
| if (!nr) { |
| return -EINVAL; |
| } |
| |
| if (last_uid == AID_ROOT) { /* have we called to get the UID yet? */ |
| last_uid = getuid(); |
| } |
| if (last_pid == (pid_t) -1) { |
| last_pid = getpid(); |
| } |
| if (log_id == LOG_ID_SECURITY) { |
| if (vec[0].iov_len < 4) { |
| return -EINVAL; |
| } |
| /* Matches clientHasLogCredentials() in logd */ |
| if ((last_uid != AID_SYSTEM) && (last_uid != AID_ROOT) && (last_uid != AID_LOG)) { |
| uid_t uid = geteuid(); |
| if ((uid != AID_SYSTEM) && (uid != AID_ROOT) && (uid != AID_LOG)) { |
| gid_t gid = getgid(); |
| if ((gid != AID_SYSTEM) && (gid != AID_ROOT) && (gid != AID_LOG)) { |
| gid = getegid(); |
| if ((gid != AID_SYSTEM) && (gid != AID_ROOT) && (gid != AID_LOG)) { |
| int num_groups; |
| gid_t *groups; |
| |
| num_groups = getgroups(0, NULL); |
| if (num_groups <= 0) { |
| return -EPERM; |
| } |
| groups = calloc(num_groups, sizeof(gid_t)); |
| if (!groups) { |
| return -ENOMEM; |
| } |
| num_groups = getgroups(num_groups, groups); |
| while (num_groups > 0) { |
| if (groups[num_groups - 1] == AID_LOG) { |
| break; |
| } |
| --num_groups; |
| } |
| free(groups); |
| if (num_groups <= 0) { |
| return -EPERM; |
| } |
| } |
| } |
| } |
| } |
| if (!__android_log_security()) { |
| atomic_store(&dropped_security, 0); |
| return -EPERM; |
| } |
| } else if (log_id == LOG_ID_EVENTS) { |
| static atomic_uintptr_t map; |
| int ret; |
| const char *tag; |
| EventTagMap *m, *f; |
| |
| if (vec[0].iov_len < 4) { |
| return -EINVAL; |
| } |
| |
| tag = NULL; |
| f = NULL; |
| m = (EventTagMap *)atomic_load(&map); |
| |
| if (!m) { |
| ret = trylock(); |
| m = (EventTagMap *)atomic_load(&map); /* trylock flush cache */ |
| if (!m) { |
| m = android_openEventTagMap(EVENT_TAG_MAP_FILE); |
| if (ret) { /* trylock failed, use local copy, mark for close */ |
| f = m; |
| } else { |
| if (!m) { /* One chance to open map file */ |
| m = (EventTagMap *)(uintptr_t)-1LL; |
| } |
| atomic_store(&map, (uintptr_t)m); |
| } |
| } |
| if (!ret) { /* trylock succeeded, unlock */ |
| unlock(); |
| } |
| } |
| if (m && (m != (EventTagMap *)(uintptr_t)-1LL)) { |
| tag = android_lookupEventTag( |
| m, |
| htole32(((uint32_t *)vec[0].iov_base)[0])); |
| } |
| ret = __android_log_is_loggable(ANDROID_LOG_INFO, |
| tag, |
| ANDROID_LOG_VERBOSE); |
| if (f) { /* local copy marked for close */ |
| android_closeEventTagMap(f); |
| } |
| if (!ret) { |
| return -EPERM; |
| } |
| } else { |
| /* Validate the incoming tag, tag content can not split across iovec */ |
| char prio = ANDROID_LOG_VERBOSE; |
| const char *tag = vec[0].iov_base; |
| size_t len = vec[0].iov_len; |
| if (!tag) { |
| len = 0; |
| } |
| if (len > 0) { |
| prio = *tag; |
| if (len > 1) { |
| --len; |
| ++tag; |
| } else { |
| len = vec[1].iov_len; |
| tag = ((const char *)vec[1].iov_base); |
| if (!tag) { |
| len = 0; |
| } |
| } |
| } |
| /* tag must be nul terminated */ |
| if (strnlen(tag, len) >= len) { |
| tag = NULL; |
| } |
| |
| if (!__android_log_is_loggable(prio, tag, ANDROID_LOG_VERBOSE)) { |
| return -EPERM; |
| } |
| } |
| |
| /* |
| * struct { |
| * // what we provide to pstore |
| * android_pmsg_log_header_t pmsg_header; |
| * // what we provide to socket |
| * android_log_header_t header; |
| * // caller provides |
| * union { |
| * struct { |
| * char prio; |
| * char payload[]; |
| * } string; |
| * struct { |
| * uint32_t tag |
| * char payload[]; |
| * } binary; |
| * }; |
| * }; |
| */ |
| |
| clock_gettime(android_log_clockid(), &ts); |
| |
| pmsg_header.magic = LOGGER_MAGIC; |
| pmsg_header.len = sizeof(pmsg_header) + sizeof(header); |
| pmsg_header.uid = last_uid; |
| pmsg_header.pid = last_pid; |
| |
| header.tid = gettid(); |
| header.realtime.tv_sec = ts.tv_sec; |
| header.realtime.tv_nsec = ts.tv_nsec; |
| |
| newVec[0].iov_base = (unsigned char *) &pmsg_header; |
| newVec[0].iov_len = sizeof(pmsg_header); |
| newVec[1].iov_base = (unsigned char *) &header; |
| newVec[1].iov_len = sizeof(header); |
| |
| if (logd_fd > 0) { |
| int32_t snapshot = atomic_exchange_explicit(&dropped_security, 0, |
| memory_order_relaxed); |
| if (snapshot) { |
| android_log_event_int_t buffer; |
| |
| header.id = LOG_ID_SECURITY; |
| buffer.header.tag = htole32(LIBLOG_LOG_TAG); |
| buffer.payload.type = EVENT_TYPE_INT; |
| buffer.payload.data = htole32(snapshot); |
| |
| newVec[2].iov_base = &buffer; |
| newVec[2].iov_len = sizeof(buffer); |
| |
| ret = TEMP_FAILURE_RETRY(writev(logd_fd, newVec + 1, 2)); |
| if (ret != (ssize_t)(sizeof(header) + sizeof(buffer))) { |
| atomic_fetch_add_explicit(&dropped_security, snapshot, |
| memory_order_relaxed); |
| } |
| } |
| snapshot = atomic_exchange_explicit(&dropped, 0, memory_order_relaxed); |
| if (snapshot && __android_log_is_loggable(ANDROID_LOG_INFO, |
| "liblog", |
| ANDROID_LOG_VERBOSE)) { |
| android_log_event_int_t buffer; |
| |
| header.id = LOG_ID_EVENTS; |
| buffer.header.tag = htole32(LIBLOG_LOG_TAG); |
| buffer.payload.type = EVENT_TYPE_INT; |
| buffer.payload.data = htole32(snapshot); |
| |
| newVec[2].iov_base = &buffer; |
| newVec[2].iov_len = sizeof(buffer); |
| |
| ret = TEMP_FAILURE_RETRY(writev(logd_fd, newVec + 1, 2)); |
| if (ret != (ssize_t)(sizeof(header) + sizeof(buffer))) { |
| atomic_fetch_add_explicit(&dropped, snapshot, |
| memory_order_relaxed); |
| } |
| } |
| } |
| |
| header.id = log_id; |
| |
| for (payload_size = 0, i = header_length; i < nr + header_length; i++) { |
| newVec[i].iov_base = vec[i - header_length].iov_base; |
| payload_size += newVec[i].iov_len = vec[i - header_length].iov_len; |
| |
| if (payload_size > LOGGER_ENTRY_MAX_PAYLOAD) { |
| newVec[i].iov_len -= payload_size - LOGGER_ENTRY_MAX_PAYLOAD; |
| if (newVec[i].iov_len) { |
| ++i; |
| } |
| payload_size = LOGGER_ENTRY_MAX_PAYLOAD; |
| break; |
| } |
| } |
| pmsg_header.len += payload_size; |
| |
| if (pstore_fd >= 0) { |
| TEMP_FAILURE_RETRY(writev(pstore_fd, newVec, i)); |
| } |
| |
| if (last_uid == AID_LOGD) { /* logd, after initialization and priv drop */ |
| /* |
| * ignore log messages we send to ourself (logd). |
| * Such log messages are often generated by libraries we depend on |
| * which use standard Android logging. |
| */ |
| return 0; |
| } |
| |
| if (logd_fd < 0) { |
| return -EBADF; |
| } |
| |
| /* |
| * The write below could be lost, but will never block. |
| * |
| * To logd, we drop the pmsg_header |
| * |
| * ENOTCONN occurs if logd dies. |
| * EAGAIN occurs if logd is overloaded. |
| */ |
| ret = TEMP_FAILURE_RETRY(writev(logd_fd, newVec + 1, i - 1)); |
| if (ret < 0) { |
| ret = -errno; |
| if (ret == -ENOTCONN) { |
| lock(); |
| close(logd_fd); |
| logd_fd = -1; |
| ret = __write_to_log_initialize(); |
| unlock(); |
| |
| if (ret < 0) { |
| return ret; |
| } |
| |
| ret = TEMP_FAILURE_RETRY(writev(logd_fd, newVec + 1, i - 1)); |
| if (ret < 0) { |
| ret = -errno; |
| } |
| } |
| } |
| |
| if (ret > (ssize_t)sizeof(header)) { |
| ret -= sizeof(header); |
| } else if (ret == -EAGAIN) { |
| atomic_fetch_add_explicit(&dropped, 1, memory_order_relaxed); |
| if (log_id == LOG_ID_SECURITY) { |
| atomic_fetch_add_explicit(&dropped_security, 1, |
| memory_order_relaxed); |
| } |
| } |
| #endif |
| |
| return ret; |
| } |
| |
| #if FAKE_LOG_DEVICE |
| 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_SECURITY] = "security", |
| [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]; |
| } |
| #endif |
| |
| static int __write_to_log_init(log_id_t log_id, struct iovec *vec, size_t nr) |
| { |
| lock(); |
| |
| if (write_to_log == __write_to_log_init) { |
| int ret; |
| |
| ret = __write_to_log_initialize(); |
| if (ret < 0) { |
| unlock(); |
| #if (FAKE_LOG_DEVICE == 0) |
| if (pstore_fd >= 0) { |
| __write_to_log_daemon(log_id, vec, nr); |
| } |
| #endif |
| return ret; |
| } |
| |
| write_to_log = __write_to_log_daemon; |
| } |
| |
| unlock(); |
| |
| return write_to_log(log_id, vec, nr); |
| } |
| |
| 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); |
| } |