| /* |
| * Copyright (C) 2007-2016 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 <stdlib.h> |
| #include <string.h> |
| #include <sys/time.h> |
| |
| #ifdef __BIONIC__ |
| #include <android/set_abort_message.h> |
| #endif |
| |
| #include <private/android_filesystem_config.h> |
| #include <private/android_logger.h> |
| |
| #include "log_portability.h" |
| #include "logger.h" |
| #include "uio.h" |
| |
| #if (FAKE_LOG_DEVICE == 0) |
| #include "logd_writer.h" |
| #include "pmsg_writer.h" |
| #else |
| #include "fake_log_device.h" |
| #endif |
| |
| #define LOG_BUF_SIZE 1024 |
| |
| #if defined(__ANDROID__) |
| static int check_log_uid_permissions() { |
| uid_t uid = getuid(); |
| |
| /* Matches clientHasLogCredentials() in logd */ |
| if ((uid != AID_SYSTEM) && (uid != AID_ROOT) && (uid != AID_LOG)) { |
| 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 = static_cast<gid_t*>(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; |
| } |
| } |
| } |
| } |
| } |
| return 0; |
| } |
| #endif |
| |
| /* |
| * Release any logger resources. A new log write will immediately re-acquire. |
| */ |
| void __android_log_close() { |
| #if (FAKE_LOG_DEVICE == 0) |
| LogdClose(); |
| PmsgClose(); |
| #else |
| FakeClose(); |
| #endif |
| } |
| |
| static int write_to_log(log_id_t log_id, struct iovec* vec, size_t nr) { |
| int ret, save_errno; |
| struct timespec ts; |
| |
| save_errno = errno; |
| |
| if (log_id == LOG_ID_KERNEL) { |
| return -EINVAL; |
| } |
| |
| #if defined(__ANDROID__) |
| clock_gettime(android_log_clockid(), &ts); |
| |
| if (log_id == LOG_ID_SECURITY) { |
| if (vec[0].iov_len < 4) { |
| errno = save_errno; |
| return -EINVAL; |
| } |
| |
| ret = check_log_uid_permissions(); |
| if (ret < 0) { |
| errno = save_errno; |
| return ret; |
| } |
| if (!__android_log_security()) { |
| /* If only we could reset downstream logd counter */ |
| errno = save_errno; |
| return -EPERM; |
| } |
| } else if (log_id == LOG_ID_EVENTS || log_id == LOG_ID_STATS) { |
| if (vec[0].iov_len < 4) { |
| errno = save_errno; |
| return -EINVAL; |
| } |
| } else { |
| int prio = *static_cast<int*>(vec[0].iov_base); |
| const char* tag = static_cast<const char*>(vec[1].iov_base); |
| size_t len = vec[1].iov_len; |
| |
| if (!__android_log_is_loggable_len(prio, tag, len - 1, ANDROID_LOG_VERBOSE)) { |
| errno = save_errno; |
| return -EPERM; |
| } |
| } |
| #else |
| /* simulate clock_gettime(CLOCK_REALTIME, &ts); */ |
| { |
| struct timeval tv; |
| gettimeofday(&tv, NULL); |
| ts.tv_sec = tv.tv_sec; |
| ts.tv_nsec = tv.tv_usec * 1000; |
| } |
| #endif |
| |
| ret = 0; |
| |
| #if (FAKE_LOG_DEVICE == 0) |
| ret = LogdWrite(log_id, &ts, vec, nr); |
| PmsgWrite(log_id, &ts, vec, nr); |
| #else |
| ret = FakeWrite(log_id, &ts, vec, nr); |
| #endif |
| |
| errno = save_errno; |
| return ret; |
| } |
| |
| 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) { |
| if (!tag) tag = ""; |
| |
| #if __BIONIC__ |
| if (prio == ANDROID_LOG_FATAL) { |
| android_set_abort_message(msg); |
| } |
| #endif |
| |
| struct iovec vec[3]; |
| 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(static_cast<log_id_t>(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"); |
| } |
| |
| // Log assertion failures to stderr for the benefit of "adb shell" users |
| // and gtests (http://b/23675822). |
| TEMP_FAILURE_RETRY(write(2, buf, strlen(buf))); |
| TEMP_FAILURE_RETRY(write(2, "\n", 1)); |
| |
| __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_stats_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_STATS, 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); |
| } |