| /*** |
| This file is part of systemd. |
| |
| Copyright 2010 Lennart Poettering |
| |
| systemd is free software; you can redistribute it and/or modify it |
| under the terms of the GNU Lesser General Public License as published by |
| the Free Software Foundation; either version 2.1 of the License, or |
| (at your option) any later version. |
| |
| systemd is distributed in the hope that it will be useful, but |
| WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public License |
| along with systemd; If not, see <http://www.gnu.org/licenses/>. |
| ***/ |
| |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <inttypes.h> |
| #include <limits.h> |
| #include <stdarg.h> |
| #include <stddef.h> |
| #include <stdio.h> |
| #include <string.h> |
| #include <sys/signalfd.h> |
| #include <sys/socket.h> |
| #include <sys/time.h> |
| #include <sys/uio.h> |
| #include <sys/un.h> |
| #include <time.h> |
| #include <unistd.h> |
| |
| #include "sd-messages.h" |
| |
| #include "alloc-util.h" |
| #include "fd-util.h" |
| #include "formats-util.h" |
| #include "io-util.h" |
| #include "log.h" |
| #include "macro.h" |
| #include "missing.h" |
| #include "parse-util.h" |
| #include "proc-cmdline.h" |
| #include "process-util.h" |
| #include "signal-util.h" |
| #include "socket-util.h" |
| #include "stdio-util.h" |
| #include "string-table.h" |
| #include "string-util.h" |
| #include "syslog-util.h" |
| #include "terminal-util.h" |
| #include "time-util.h" |
| #include "util.h" |
| |
| #define SNDBUF_SIZE (8*1024*1024) |
| |
| static LogTarget log_target = LOG_TARGET_CONSOLE; |
| static int log_max_level = LOG_INFO; |
| static int log_facility = LOG_DAEMON; |
| |
| static int console_fd = STDERR_FILENO; |
| static int syslog_fd = -1; |
| static int kmsg_fd = -1; |
| static int journal_fd = -1; |
| |
| static bool syslog_is_stream = false; |
| |
| static bool show_color = false; |
| static bool show_location = false; |
| |
| static bool upgrade_syslog_to_journal = false; |
| |
| /* Akin to glibc's __abort_msg; which is private and we hence cannot |
| * use here. */ |
| static char *log_abort_msg = NULL; |
| |
| void log_close_console(void) { |
| |
| if (console_fd < 0) |
| return; |
| |
| if (getpid() == 1) { |
| if (console_fd >= 3) |
| safe_close(console_fd); |
| |
| console_fd = -1; |
| } |
| } |
| |
| static int log_open_console(void) { |
| |
| if (console_fd >= 0) |
| return 0; |
| |
| if (getpid() == 1) { |
| console_fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC); |
| if (console_fd < 0) |
| return console_fd; |
| } else |
| console_fd = STDERR_FILENO; |
| |
| return 0; |
| } |
| |
| void log_close_kmsg(void) { |
| kmsg_fd = safe_close(kmsg_fd); |
| } |
| |
| static int log_open_kmsg(void) { |
| |
| if (kmsg_fd >= 0) |
| return 0; |
| |
| kmsg_fd = open("/dev/kmsg", O_WRONLY|O_NOCTTY|O_CLOEXEC); |
| if (kmsg_fd < 0) |
| return -errno; |
| |
| return 0; |
| } |
| |
| void log_close_syslog(void) { |
| syslog_fd = safe_close(syslog_fd); |
| } |
| |
| static int create_log_socket(int type) { |
| struct timeval tv; |
| int fd; |
| |
| fd = socket(AF_UNIX, type|SOCK_CLOEXEC, 0); |
| if (fd < 0) |
| return -errno; |
| |
| (void) fd_inc_sndbuf(fd, SNDBUF_SIZE); |
| |
| /* We need a blocking fd here since we'd otherwise lose |
| messages way too early. However, let's not hang forever in the |
| unlikely case of a deadlock. */ |
| if (getpid() == 1) |
| timeval_store(&tv, 10 * USEC_PER_MSEC); |
| else |
| timeval_store(&tv, 10 * USEC_PER_SEC); |
| (void) setsockopt(fd, SOL_SOCKET, SO_SNDTIMEO, &tv, sizeof(tv)); |
| |
| return fd; |
| } |
| |
| static int log_open_syslog(void) { |
| |
| static const union sockaddr_union sa = { |
| .un.sun_family = AF_UNIX, |
| .un.sun_path = "/dev/log", |
| }; |
| |
| int r; |
| |
| if (syslog_fd >= 0) |
| return 0; |
| |
| syslog_fd = create_log_socket(SOCK_DGRAM); |
| if (syslog_fd < 0) { |
| r = syslog_fd; |
| goto fail; |
| } |
| |
| if (connect(syslog_fd, &sa.sa, SOCKADDR_UN_LEN(sa.un)) < 0) { |
| safe_close(syslog_fd); |
| |
| /* Some legacy syslog systems still use stream |
| * sockets. They really shouldn't. But what can we |
| * do... */ |
| syslog_fd = create_log_socket(SOCK_STREAM); |
| if (syslog_fd < 0) { |
| r = syslog_fd; |
| goto fail; |
| } |
| |
| if (connect(syslog_fd, &sa.sa, SOCKADDR_UN_LEN(sa.un)) < 0) { |
| r = -errno; |
| goto fail; |
| } |
| |
| syslog_is_stream = true; |
| } else |
| syslog_is_stream = false; |
| |
| return 0; |
| |
| fail: |
| log_close_syslog(); |
| return r; |
| } |
| |
| void log_close_journal(void) { |
| journal_fd = safe_close(journal_fd); |
| } |
| |
| static int log_open_journal(void) { |
| |
| static const union sockaddr_union sa = { |
| .un.sun_family = AF_UNIX, |
| .un.sun_path = "/run/systemd/journal/socket", |
| }; |
| |
| int r; |
| |
| if (journal_fd >= 0) |
| return 0; |
| |
| journal_fd = create_log_socket(SOCK_DGRAM); |
| if (journal_fd < 0) { |
| r = journal_fd; |
| goto fail; |
| } |
| |
| if (connect(journal_fd, &sa.sa, SOCKADDR_UN_LEN(sa.un)) < 0) { |
| r = -errno; |
| goto fail; |
| } |
| |
| return 0; |
| |
| fail: |
| log_close_journal(); |
| return r; |
| } |
| |
| int log_open(void) { |
| int r; |
| |
| /* If we don't use the console we close it here, to not get |
| * killed by SAK. If we don't use syslog we close it here so |
| * that we are not confused by somebody deleting the socket in |
| * the fs. If we don't use /dev/kmsg we still keep it open, |
| * because there is no reason to close it. */ |
| |
| if (log_target == LOG_TARGET_NULL) { |
| log_close_journal(); |
| log_close_syslog(); |
| log_close_console(); |
| return 0; |
| } |
| |
| if ((log_target != LOG_TARGET_AUTO && log_target != LOG_TARGET_SAFE) || |
| getpid() == 1 || |
| isatty(STDERR_FILENO) <= 0) { |
| |
| if (log_target == LOG_TARGET_AUTO || |
| log_target == LOG_TARGET_JOURNAL_OR_KMSG || |
| log_target == LOG_TARGET_JOURNAL) { |
| r = log_open_journal(); |
| if (r >= 0) { |
| log_close_syslog(); |
| log_close_console(); |
| return r; |
| } |
| } |
| |
| if (log_target == LOG_TARGET_SYSLOG_OR_KMSG || |
| log_target == LOG_TARGET_SYSLOG) { |
| r = log_open_syslog(); |
| if (r >= 0) { |
| log_close_journal(); |
| log_close_console(); |
| return r; |
| } |
| } |
| |
| if (log_target == LOG_TARGET_AUTO || |
| log_target == LOG_TARGET_SAFE || |
| log_target == LOG_TARGET_JOURNAL_OR_KMSG || |
| log_target == LOG_TARGET_SYSLOG_OR_KMSG || |
| log_target == LOG_TARGET_KMSG) { |
| r = log_open_kmsg(); |
| if (r >= 0) { |
| log_close_journal(); |
| log_close_syslog(); |
| log_close_console(); |
| return r; |
| } |
| } |
| } |
| |
| log_close_journal(); |
| log_close_syslog(); |
| |
| return log_open_console(); |
| } |
| |
| void log_set_target(LogTarget target) { |
| assert(target >= 0); |
| assert(target < _LOG_TARGET_MAX); |
| |
| if (upgrade_syslog_to_journal) { |
| if (target == LOG_TARGET_SYSLOG) |
| target = LOG_TARGET_JOURNAL; |
| else if (target == LOG_TARGET_SYSLOG_OR_KMSG) |
| target = LOG_TARGET_JOURNAL_OR_KMSG; |
| } |
| |
| log_target = target; |
| } |
| |
| void log_close(void) { |
| log_close_journal(); |
| log_close_syslog(); |
| log_close_kmsg(); |
| log_close_console(); |
| } |
| |
| void log_forget_fds(void) { |
| console_fd = kmsg_fd = syslog_fd = journal_fd = -1; |
| } |
| |
| void log_set_max_level(int level) { |
| assert((level & LOG_PRIMASK) == level); |
| |
| log_max_level = level; |
| } |
| |
| void log_set_facility(int facility) { |
| log_facility = facility; |
| } |
| |
| static int write_to_console( |
| int level, |
| int error, |
| const char *file, |
| int line, |
| const char *func, |
| const char *buffer) { |
| |
| char location[256], prefix[1 + DECIMAL_STR_MAX(int) + 2]; |
| struct iovec iovec[6] = {}; |
| unsigned n = 0; |
| bool highlight; |
| |
| if (console_fd < 0) |
| return 0; |
| |
| if (log_target == LOG_TARGET_CONSOLE_PREFIXED) { |
| xsprintf(prefix, "<%i>", level); |
| IOVEC_SET_STRING(iovec[n++], prefix); |
| } |
| |
| highlight = LOG_PRI(level) <= LOG_ERR && show_color; |
| |
| if (show_location) { |
| snprintf(location, sizeof(location), "(%s:%i) ", file, line); |
| IOVEC_SET_STRING(iovec[n++], location); |
| } |
| |
| if (highlight) |
| IOVEC_SET_STRING(iovec[n++], ANSI_HIGHLIGHT_RED); |
| IOVEC_SET_STRING(iovec[n++], buffer); |
| if (highlight) |
| IOVEC_SET_STRING(iovec[n++], ANSI_NORMAL); |
| IOVEC_SET_STRING(iovec[n++], "\n"); |
| |
| if (writev(console_fd, iovec, n) < 0) { |
| |
| if (errno == EIO && getpid() == 1) { |
| |
| /* If somebody tried to kick us from our |
| * console tty (via vhangup() or suchlike), |
| * try to reconnect */ |
| |
| log_close_console(); |
| log_open_console(); |
| |
| if (console_fd < 0) |
| return 0; |
| |
| if (writev(console_fd, iovec, n) < 0) |
| return -errno; |
| } else |
| return -errno; |
| } |
| |
| return 1; |
| } |
| |
| static int write_to_syslog( |
| int level, |
| int error, |
| const char *file, |
| int line, |
| const char *func, |
| const char *buffer) { |
| |
| char header_priority[2 + DECIMAL_STR_MAX(int) + 1], |
| header_time[64], |
| header_pid[4 + DECIMAL_STR_MAX(pid_t) + 1]; |
| struct iovec iovec[5] = {}; |
| struct msghdr msghdr = { |
| .msg_iov = iovec, |
| .msg_iovlen = ELEMENTSOF(iovec), |
| }; |
| time_t t; |
| struct tm *tm; |
| |
| if (syslog_fd < 0) |
| return 0; |
| |
| xsprintf(header_priority, "<%i>", level); |
| |
| t = (time_t) (now(CLOCK_REALTIME) / USEC_PER_SEC); |
| tm = localtime(&t); |
| if (!tm) |
| return -EINVAL; |
| |
| if (strftime(header_time, sizeof(header_time), "%h %e %T ", tm) <= 0) |
| return -EINVAL; |
| |
| xsprintf(header_pid, "["PID_FMT"]: ", getpid()); |
| |
| IOVEC_SET_STRING(iovec[0], header_priority); |
| IOVEC_SET_STRING(iovec[1], header_time); |
| IOVEC_SET_STRING(iovec[2], program_invocation_short_name); |
| IOVEC_SET_STRING(iovec[3], header_pid); |
| IOVEC_SET_STRING(iovec[4], buffer); |
| |
| /* When using syslog via SOCK_STREAM separate the messages by NUL chars */ |
| if (syslog_is_stream) |
| iovec[4].iov_len++; |
| |
| for (;;) { |
| ssize_t n; |
| |
| n = sendmsg(syslog_fd, &msghdr, MSG_NOSIGNAL); |
| if (n < 0) |
| return -errno; |
| |
| if (!syslog_is_stream || |
| (size_t) n >= IOVEC_TOTAL_SIZE(iovec, ELEMENTSOF(iovec))) |
| break; |
| |
| IOVEC_INCREMENT(iovec, ELEMENTSOF(iovec), n); |
| } |
| |
| return 1; |
| } |
| |
| static int write_to_kmsg( |
| int level, |
| int error, |
| const char *file, |
| int line, |
| const char *func, |
| const char *buffer) { |
| |
| char header_priority[2 + DECIMAL_STR_MAX(int) + 1], |
| header_pid[4 + DECIMAL_STR_MAX(pid_t) + 1]; |
| struct iovec iovec[5] = {}; |
| |
| if (kmsg_fd < 0) |
| return 0; |
| |
| xsprintf(header_priority, "<%i>", level); |
| xsprintf(header_pid, "["PID_FMT"]: ", getpid()); |
| |
| IOVEC_SET_STRING(iovec[0], header_priority); |
| IOVEC_SET_STRING(iovec[1], program_invocation_short_name); |
| IOVEC_SET_STRING(iovec[2], header_pid); |
| IOVEC_SET_STRING(iovec[3], buffer); |
| IOVEC_SET_STRING(iovec[4], "\n"); |
| |
| if (writev(kmsg_fd, iovec, ELEMENTSOF(iovec)) < 0) |
| return -errno; |
| |
| return 1; |
| } |
| |
| static int log_do_header( |
| char *header, |
| size_t size, |
| int level, |
| int error, |
| const char *file, int line, const char *func, |
| const char *object_field, const char *object, |
| const char *extra_field, const char *extra) { |
| |
| snprintf(header, size, |
| "PRIORITY=%i\n" |
| "SYSLOG_FACILITY=%i\n" |
| "%s%s%s" |
| "%s%.*i%s" |
| "%s%s%s" |
| "%s%.*i%s" |
| "%s%s%s" |
| "%s%s%s" |
| "SYSLOG_IDENTIFIER=%s\n", |
| LOG_PRI(level), |
| LOG_FAC(level), |
| isempty(file) ? "" : "CODE_FILE=", |
| isempty(file) ? "" : file, |
| isempty(file) ? "" : "\n", |
| line ? "CODE_LINE=" : "", |
| line ? 1 : 0, line, /* %.0d means no output too, special case for 0 */ |
| line ? "\n" : "", |
| isempty(func) ? "" : "CODE_FUNCTION=", |
| isempty(func) ? "" : func, |
| isempty(func) ? "" : "\n", |
| error ? "ERRNO=" : "", |
| error ? 1 : 0, error, |
| error ? "\n" : "", |
| isempty(object) ? "" : object_field, |
| isempty(object) ? "" : object, |
| isempty(object) ? "" : "\n", |
| isempty(extra) ? "" : extra_field, |
| isempty(extra) ? "" : extra, |
| isempty(extra) ? "" : "\n", |
| program_invocation_short_name); |
| |
| return 0; |
| } |
| |
| static int write_to_journal( |
| int level, |
| int error, |
| const char *file, |
| int line, |
| const char *func, |
| const char *object_field, |
| const char *object, |
| const char *extra_field, |
| const char *extra, |
| const char *buffer) { |
| |
| char header[LINE_MAX]; |
| struct iovec iovec[4] = {}; |
| struct msghdr mh = {}; |
| |
| if (journal_fd < 0) |
| return 0; |
| |
| log_do_header(header, sizeof(header), level, error, file, line, func, object_field, object, extra_field, extra); |
| |
| IOVEC_SET_STRING(iovec[0], header); |
| IOVEC_SET_STRING(iovec[1], "MESSAGE="); |
| IOVEC_SET_STRING(iovec[2], buffer); |
| IOVEC_SET_STRING(iovec[3], "\n"); |
| |
| mh.msg_iov = iovec; |
| mh.msg_iovlen = ELEMENTSOF(iovec); |
| |
| if (sendmsg(journal_fd, &mh, MSG_NOSIGNAL) < 0) |
| return -errno; |
| |
| return 1; |
| } |
| |
| static int log_dispatch( |
| int level, |
| int error, |
| const char *file, |
| int line, |
| const char *func, |
| const char *object_field, |
| const char *object, |
| const char *extra, |
| const char *extra_field, |
| char *buffer) { |
| |
| assert(buffer); |
| |
| if (error < 0) |
| error = -error; |
| |
| if (log_target == LOG_TARGET_NULL) |
| return -error; |
| |
| /* Patch in LOG_DAEMON facility if necessary */ |
| if ((level & LOG_FACMASK) == 0) |
| level = log_facility | LOG_PRI(level); |
| |
| do { |
| char *e; |
| int k = 0; |
| |
| buffer += strspn(buffer, NEWLINE); |
| |
| if (buffer[0] == 0) |
| break; |
| |
| if ((e = strpbrk(buffer, NEWLINE))) |
| *(e++) = 0; |
| |
| if (log_target == LOG_TARGET_AUTO || |
| log_target == LOG_TARGET_JOURNAL_OR_KMSG || |
| log_target == LOG_TARGET_JOURNAL) { |
| |
| k = write_to_journal(level, error, file, line, func, object_field, object, extra_field, extra, buffer); |
| if (k < 0) { |
| if (k != -EAGAIN) |
| log_close_journal(); |
| log_open_kmsg(); |
| } |
| } |
| |
| if (log_target == LOG_TARGET_SYSLOG_OR_KMSG || |
| log_target == LOG_TARGET_SYSLOG) { |
| |
| k = write_to_syslog(level, error, file, line, func, buffer); |
| if (k < 0) { |
| if (k != -EAGAIN) |
| log_close_syslog(); |
| log_open_kmsg(); |
| } |
| } |
| |
| if (k <= 0 && |
| (log_target == LOG_TARGET_AUTO || |
| log_target == LOG_TARGET_SAFE || |
| log_target == LOG_TARGET_SYSLOG_OR_KMSG || |
| log_target == LOG_TARGET_JOURNAL_OR_KMSG || |
| log_target == LOG_TARGET_KMSG)) { |
| |
| k = write_to_kmsg(level, error, file, line, func, buffer); |
| if (k < 0) { |
| log_close_kmsg(); |
| log_open_console(); |
| } |
| } |
| |
| if (k <= 0) |
| (void) write_to_console(level, error, file, line, func, buffer); |
| |
| buffer = e; |
| } while (buffer); |
| |
| return -error; |
| } |
| |
| int log_dump_internal( |
| int level, |
| int error, |
| const char *file, |
| int line, |
| const char *func, |
| char *buffer) { |
| |
| PROTECT_ERRNO; |
| |
| /* This modifies the buffer... */ |
| |
| if (error < 0) |
| error = -error; |
| |
| if (_likely_(LOG_PRI(level) > log_max_level)) |
| return -error; |
| |
| return log_dispatch(level, error, file, line, func, NULL, NULL, NULL, NULL, buffer); |
| } |
| |
| int log_internalv( |
| int level, |
| int error, |
| const char *file, |
| int line, |
| const char *func, |
| const char *format, |
| va_list ap) { |
| |
| PROTECT_ERRNO; |
| char buffer[LINE_MAX]; |
| |
| if (error < 0) |
| error = -error; |
| |
| if (_likely_(LOG_PRI(level) > log_max_level)) |
| return -error; |
| |
| /* Make sure that %m maps to the specified error */ |
| if (error != 0) |
| errno = error; |
| |
| vsnprintf(buffer, sizeof(buffer), format, ap); |
| |
| return log_dispatch(level, error, file, line, func, NULL, NULL, NULL, NULL, buffer); |
| } |
| |
| int log_internal( |
| int level, |
| int error, |
| const char *file, |
| int line, |
| const char *func, |
| const char *format, ...) { |
| |
| va_list ap; |
| int r; |
| |
| va_start(ap, format); |
| r = log_internalv(level, error, file, line, func, format, ap); |
| va_end(ap); |
| |
| return r; |
| } |
| |
| int log_object_internalv( |
| int level, |
| int error, |
| const char *file, |
| int line, |
| const char *func, |
| const char *object_field, |
| const char *object, |
| const char *extra_field, |
| const char *extra, |
| const char *format, |
| va_list ap) { |
| |
| PROTECT_ERRNO; |
| char *buffer, *b; |
| size_t l; |
| |
| if (error < 0) |
| error = -error; |
| |
| if (_likely_(LOG_PRI(level) > log_max_level)) |
| return -error; |
| |
| /* Make sure that %m maps to the specified error */ |
| if (error != 0) |
| errno = error; |
| |
| /* Prepend the object name before the message */ |
| if (object) { |
| size_t n; |
| |
| n = strlen(object); |
| l = n + 2 + LINE_MAX; |
| |
| buffer = newa(char, l); |
| b = stpcpy(stpcpy(buffer, object), ": "); |
| } else { |
| l = LINE_MAX; |
| b = buffer = newa(char, l); |
| } |
| |
| vsnprintf(b, l, format, ap); |
| |
| return log_dispatch(level, error, file, line, func, object_field, object, extra_field, extra, buffer); |
| } |
| |
| int log_object_internal( |
| int level, |
| int error, |
| const char *file, |
| int line, |
| const char *func, |
| const char *object_field, |
| const char *object, |
| const char *extra_field, |
| const char *extra, |
| const char *format, ...) { |
| |
| va_list ap; |
| int r; |
| |
| va_start(ap, format); |
| r = log_object_internalv(level, error, file, line, func, object_field, object, extra_field, extra, format, ap); |
| va_end(ap); |
| |
| return r; |
| } |
| |
| static void log_assert( |
| int level, |
| const char *text, |
| const char *file, |
| int line, |
| const char *func, |
| const char *format) { |
| |
| static char buffer[LINE_MAX]; |
| |
| if (_likely_(LOG_PRI(level) > log_max_level)) |
| return; |
| |
| DISABLE_WARNING_FORMAT_NONLITERAL; |
| snprintf(buffer, sizeof buffer, format, text, file, line, func); |
| REENABLE_WARNING; |
| |
| log_abort_msg = buffer; |
| |
| log_dispatch(level, 0, file, line, func, NULL, NULL, NULL, NULL, buffer); |
| } |
| |
| noreturn void log_assert_failed(const char *text, const char *file, int line, const char *func) { |
| log_assert(LOG_CRIT, text, file, line, func, "Assertion '%s' failed at %s:%u, function %s(). Aborting."); |
| abort(); |
| } |
| |
| noreturn void log_assert_failed_unreachable(const char *text, const char *file, int line, const char *func) { |
| log_assert(LOG_CRIT, text, file, line, func, "Code should not be reached '%s' at %s:%u, function %s(). Aborting."); |
| abort(); |
| } |
| |
| void log_assert_failed_return(const char *text, const char *file, int line, const char *func) { |
| PROTECT_ERRNO; |
| log_assert(LOG_DEBUG, text, file, line, func, "Assertion '%s' failed at %s:%u, function %s(). Ignoring."); |
| } |
| |
| int log_oom_internal(const char *file, int line, const char *func) { |
| log_internal(LOG_ERR, ENOMEM, file, line, func, "Out of memory."); |
| return -ENOMEM; |
| } |
| |
| int log_format_iovec( |
| struct iovec *iovec, |
| unsigned iovec_len, |
| unsigned *n, |
| bool newline_separator, |
| int error, |
| const char *format, |
| va_list ap) { |
| |
| static const char nl = '\n'; |
| |
| while (format && *n + 1 < iovec_len) { |
| va_list aq; |
| char *m; |
| int r; |
| |
| /* We need to copy the va_list structure, |
| * since vasprintf() leaves it afterwards at |
| * an undefined location */ |
| |
| if (error != 0) |
| errno = error; |
| |
| va_copy(aq, ap); |
| r = vasprintf(&m, format, aq); |
| va_end(aq); |
| if (r < 0) |
| return -EINVAL; |
| |
| /* Now, jump enough ahead, so that we point to |
| * the next format string */ |
| VA_FORMAT_ADVANCE(format, ap); |
| |
| IOVEC_SET_STRING(iovec[(*n)++], m); |
| |
| if (newline_separator) { |
| iovec[*n].iov_base = (char*) &nl; |
| iovec[*n].iov_len = 1; |
| (*n)++; |
| } |
| |
| format = va_arg(ap, char *); |
| } |
| return 0; |
| } |
| |
| int log_struct_internal( |
| int level, |
| int error, |
| const char *file, |
| int line, |
| const char *func, |
| const char *format, ...) { |
| |
| char buf[LINE_MAX]; |
| bool found = false; |
| PROTECT_ERRNO; |
| va_list ap; |
| |
| if (error < 0) |
| error = -error; |
| |
| if (_likely_(LOG_PRI(level) > log_max_level)) |
| return -error; |
| |
| if (log_target == LOG_TARGET_NULL) |
| return -error; |
| |
| if ((level & LOG_FACMASK) == 0) |
| level = log_facility | LOG_PRI(level); |
| |
| if ((log_target == LOG_TARGET_AUTO || |
| log_target == LOG_TARGET_JOURNAL_OR_KMSG || |
| log_target == LOG_TARGET_JOURNAL) && |
| journal_fd >= 0) { |
| char header[LINE_MAX]; |
| struct iovec iovec[17] = {}; |
| unsigned n = 0, i; |
| int r; |
| struct msghdr mh = { |
| .msg_iov = iovec, |
| }; |
| bool fallback = false; |
| |
| /* If the journal is available do structured logging */ |
| log_do_header(header, sizeof(header), level, error, file, line, func, NULL, NULL, NULL, NULL); |
| IOVEC_SET_STRING(iovec[n++], header); |
| |
| va_start(ap, format); |
| r = log_format_iovec(iovec, ELEMENTSOF(iovec), &n, true, error, format, ap); |
| if (r < 0) |
| fallback = true; |
| else { |
| mh.msg_iovlen = n; |
| (void) sendmsg(journal_fd, &mh, MSG_NOSIGNAL); |
| } |
| |
| va_end(ap); |
| for (i = 1; i < n; i += 2) |
| free(iovec[i].iov_base); |
| |
| if (!fallback) |
| return -error; |
| } |
| |
| /* Fallback if journal logging is not available or didn't work. */ |
| |
| va_start(ap, format); |
| while (format) { |
| va_list aq; |
| |
| if (error != 0) |
| errno = error; |
| |
| va_copy(aq, ap); |
| vsnprintf(buf, sizeof(buf), format, aq); |
| va_end(aq); |
| |
| if (startswith(buf, "MESSAGE=")) { |
| found = true; |
| break; |
| } |
| |
| VA_FORMAT_ADVANCE(format, ap); |
| |
| format = va_arg(ap, char *); |
| } |
| va_end(ap); |
| |
| if (!found) |
| return -error; |
| |
| return log_dispatch(level, error, file, line, func, NULL, NULL, NULL, NULL, buf + 8); |
| } |
| |
| int log_set_target_from_string(const char *e) { |
| LogTarget t; |
| |
| t = log_target_from_string(e); |
| if (t < 0) |
| return -EINVAL; |
| |
| log_set_target(t); |
| return 0; |
| } |
| |
| int log_set_max_level_from_string(const char *e) { |
| int t; |
| |
| t = log_level_from_string(e); |
| if (t < 0) |
| return -EINVAL; |
| |
| log_set_max_level(t); |
| return 0; |
| } |
| |
| static int parse_proc_cmdline_item(const char *key, const char *value, void *data) { |
| |
| /* |
| * The systemd.log_xyz= settings are parsed by all tools, and |
| * so is "debug". |
| * |
| * However, "quiet" is only parsed by PID 1, and only turns of |
| * status output to /dev/console, but does not alter the log |
| * level. |
| */ |
| |
| if (streq(key, "debug") && !value) |
| log_set_max_level(LOG_DEBUG); |
| |
| else if (streq(key, "systemd.log_target") && value) { |
| |
| if (log_set_target_from_string(value) < 0) |
| log_warning("Failed to parse log target '%s'. Ignoring.", value); |
| |
| } else if (streq(key, "systemd.log_level") && value) { |
| |
| if (log_set_max_level_from_string(value) < 0) |
| log_warning("Failed to parse log level '%s'. Ignoring.", value); |
| |
| } else if (streq(key, "systemd.log_color") && value) { |
| |
| if (log_show_color_from_string(value) < 0) |
| log_warning("Failed to parse log color setting '%s'. Ignoring.", value); |
| |
| } else if (streq(key, "systemd.log_location") && value) { |
| |
| if (log_show_location_from_string(value) < 0) |
| log_warning("Failed to parse log location setting '%s'. Ignoring.", value); |
| } |
| |
| return 0; |
| } |
| |
| void log_parse_environment(void) { |
| const char *e; |
| |
| if (get_ctty_devnr(0, NULL) < 0) |
| /* Only try to read the command line in daemons. |
| We assume that anything that has a controlling |
| tty is user stuff. */ |
| (void) parse_proc_cmdline(parse_proc_cmdline_item, NULL, true); |
| |
| e = secure_getenv("SYSTEMD_LOG_TARGET"); |
| if (e && log_set_target_from_string(e) < 0) |
| log_warning("Failed to parse log target '%s'. Ignoring.", e); |
| |
| e = secure_getenv("SYSTEMD_LOG_LEVEL"); |
| if (e && log_set_max_level_from_string(e) < 0) |
| log_warning("Failed to parse log level '%s'. Ignoring.", e); |
| |
| e = secure_getenv("SYSTEMD_LOG_COLOR"); |
| if (e && log_show_color_from_string(e) < 0) |
| log_warning("Failed to parse bool '%s'. Ignoring.", e); |
| |
| e = secure_getenv("SYSTEMD_LOG_LOCATION"); |
| if (e && log_show_location_from_string(e) < 0) |
| log_warning("Failed to parse bool '%s'. Ignoring.", e); |
| } |
| |
| LogTarget log_get_target(void) { |
| return log_target; |
| } |
| |
| int log_get_max_level(void) { |
| return log_max_level; |
| } |
| |
| void log_show_color(bool b) { |
| show_color = b; |
| } |
| |
| bool log_get_show_color(void) { |
| return show_color; |
| } |
| |
| void log_show_location(bool b) { |
| show_location = b; |
| } |
| |
| bool log_get_show_location(void) { |
| return show_location; |
| } |
| |
| int log_show_color_from_string(const char *e) { |
| int t; |
| |
| t = parse_boolean(e); |
| if (t < 0) |
| return t; |
| |
| log_show_color(t); |
| return 0; |
| } |
| |
| int log_show_location_from_string(const char *e) { |
| int t; |
| |
| t = parse_boolean(e); |
| if (t < 0) |
| return t; |
| |
| log_show_location(t); |
| return 0; |
| } |
| |
| bool log_on_console(void) { |
| if (log_target == LOG_TARGET_CONSOLE || |
| log_target == LOG_TARGET_CONSOLE_PREFIXED) |
| return true; |
| |
| return syslog_fd < 0 && kmsg_fd < 0 && journal_fd < 0; |
| } |
| |
| static const char *const log_target_table[_LOG_TARGET_MAX] = { |
| [LOG_TARGET_CONSOLE] = "console", |
| [LOG_TARGET_CONSOLE_PREFIXED] = "console-prefixed", |
| [LOG_TARGET_KMSG] = "kmsg", |
| [LOG_TARGET_JOURNAL] = "journal", |
| [LOG_TARGET_JOURNAL_OR_KMSG] = "journal-or-kmsg", |
| [LOG_TARGET_SYSLOG] = "syslog", |
| [LOG_TARGET_SYSLOG_OR_KMSG] = "syslog-or-kmsg", |
| [LOG_TARGET_AUTO] = "auto", |
| [LOG_TARGET_SAFE] = "safe", |
| [LOG_TARGET_NULL] = "null" |
| }; |
| |
| DEFINE_STRING_TABLE_LOOKUP(log_target, LogTarget); |
| |
| void log_received_signal(int level, const struct signalfd_siginfo *si) { |
| if (si->ssi_pid > 0) { |
| _cleanup_free_ char *p = NULL; |
| |
| get_process_comm(si->ssi_pid, &p); |
| |
| log_full(level, |
| "Received SIG%s from PID %"PRIu32" (%s).", |
| signal_to_string(si->ssi_signo), |
| si->ssi_pid, strna(p)); |
| } else |
| log_full(level, |
| "Received SIG%s.", |
| signal_to_string(si->ssi_signo)); |
| |
| } |
| |
| void log_set_upgrade_syslog_to_journal(bool b) { |
| upgrade_syslog_to_journal = b; |
| } |
| |
| int log_syntax_internal( |
| const char *unit, |
| int level, |
| const char *config_file, |
| unsigned config_line, |
| int error, |
| const char *file, |
| int line, |
| const char *func, |
| const char *format, ...) { |
| |
| PROTECT_ERRNO; |
| char buffer[LINE_MAX]; |
| int r; |
| va_list ap; |
| |
| if (error < 0) |
| error = -error; |
| |
| if (_likely_(LOG_PRI(level) > log_max_level)) |
| return -error; |
| |
| if (log_target == LOG_TARGET_NULL) |
| return -error; |
| |
| if (error != 0) |
| errno = error; |
| |
| va_start(ap, format); |
| vsnprintf(buffer, sizeof(buffer), format, ap); |
| va_end(ap); |
| |
| if (unit) |
| r = log_struct_internal( |
| level, error, |
| file, line, func, |
| getpid() == 1 ? "UNIT=%s" : "USER_UNIT=%s", unit, |
| LOG_MESSAGE_ID(SD_MESSAGE_INVALID_CONFIGURATION), |
| "CONFIG_FILE=%s", config_file, |
| "CONFIG_LINE=%u", config_line, |
| LOG_MESSAGE("[%s:%u] %s", config_file, config_line, buffer), |
| NULL); |
| else |
| r = log_struct_internal( |
| level, error, |
| file, line, func, |
| LOG_MESSAGE_ID(SD_MESSAGE_INVALID_CONFIGURATION), |
| "CONFIG_FILE=%s", config_file, |
| "CONFIG_LINE=%u", config_line, |
| LOG_MESSAGE("[%s:%u] %s", config_file, config_line, buffer), |
| NULL); |
| |
| return r; |
| } |