29378720657

Committed 14 Jul 2026 11:44PM UTC coverage: 72.936% (-0.004%) from 72.94%

Build # 29378720657

Build Type

push

github

Committed by

yuwata

Commit Message

sd-dhcp-relay: fix off-by-one when discarding BOOTREQUEST messages by hops count

According to RFC specifications
```
RFC 1542 section 4.1.1 states:
The relay agent MUST silently discard BOOTREQUEST messages whose 'hops'
   field exceeds the value 16."
```

"Exceeds the value 16" means hops > 16, i.e. a message that arrives with
hops == 16 is still valid and must be relayed (after which its hops field
becomes 17). The code used ">= 16", which silently dropped a valid message
that had legitimately traversed exactly 16 relay agents, one hop too early.

This matches the wording of the adjacent comment, which already says
"exceeds the value 16".

Coverage Stats

2 of 2 new or added lines in 2 files covered. (100.0%)

4253 existing lines in 80 files now uncovered.

345834 of 474164 relevant lines covered (72.94%)

1318659.74 hits per line

Source File
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84.8

/src/basic/log.c

/* SPDX-License-Identifier: LGPL-2.1-or-later */

#include <fcntl.h>
#include <sys/signalfd.h>
#include <sys/stat.h>
#include <sys/uio.h>
#include <threads.h>
#include <unistd.h>

#include "sd-messages.h"

#include "alloc-util.h"
#include "ansi-color.h"
#include "argv-util.h"
#include "env-util.h"
#include "errno-util.h"
#include "extract-word.h"
#include "fd-util.h"
#include "format-util.h"
#include "iovec-util.h"
#include "list.h"
#include "log.h"
#include "log-context.h"
#include "parse-util.h"
#include "proc-cmdline.h"
#include "process-util.h"
#include "ratelimit.h"
#include "signal-util.h"
#include "socket-util.h"
#include "stdio-util.h"
#include "string-table.h"
#include "string-util.h"
#include "strv.h"
#include "syslog-util.h"
#include "terminal-util.h"
#include "time-util.h"
#include "utf8.h"

#define SNDBUF_SIZE (8*1024*1024)
#define IOVEC_MAX 256U

static log_syntax_callback_t log_syntax_callback = NULL;
static void *log_syntax_callback_userdata = NULL;

static LogTarget log_target = LOG_TARGET_CONSOLE;
static int log_max_level = LOG_INFO;
static int log_target_max_level[_LOG_TARGET_SINGLE_MAX] = {
        [LOG_TARGET_CONSOLE] = INT_MAX,
        [LOG_TARGET_KMSG]    = INT_MAX,
        [LOG_TARGET_SYSLOG]  = INT_MAX,
        [LOG_TARGET_JOURNAL] = INT_MAX,
};
static int log_facility = LOG_DAEMON;
static bool ratelimit_kmsg = true;

static int console_fd = STDERR_FILENO;
static int console_fd_is_tty = -1; /* tri-state: -1 means don't know */
static int syslog_fd = -EBADF;
static int kmsg_fd = -EBADF;
static int journal_fd = -EBADF;

static bool syslog_is_stream = false;

static int show_color = -1; /* tristate */
static bool show_location = false;
static bool show_time = false;
static bool show_tid = false;

static bool upgrade_syslog_to_journal = false;
static bool always_reopen_console = false;
static bool open_when_needed = false;
static bool prohibit_ipc = false;

static thread_local const char *log_prefix = NULL;

#if LOG_MESSAGE_VERIFICATION || defined(__COVERITY__)
bool _log_message_dummy = false; /* Always false */
#endif

/* An assert to use in logging functions that does not call recursively
 * into our logging functions (since that might lead to a loop). */
#define assert_raw(expr)                                                \
        do {                                                            \
                if (_unlikely_(!(expr))) {                              \
                        fputs(#expr "\n", stderr);                      \
                        abort();                                        \
                }                                                       \
        } while (false)

void log_prefix_swap(const char **prefix) {
        assert(prefix);

        SWAP_TWO(log_prefix, *prefix);
}

static void log_close_console(void) {
        /* See comment in log_close_journal() */
        (void) safe_close_above_stdio(TAKE_FD(console_fd));
        console_fd_is_tty = -1;
}

static int log_open_console(void) {

        if (!always_reopen_console) {
                console_fd = STDERR_FILENO;
                console_fd_is_tty = -1;
                return 0;
        }

        if (console_fd < 3) {
                int fd;

                fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC);
                if (fd < 0)
                        return fd;

                console_fd = fd_move_above_stdio(fd);
                console_fd_is_tty = true;
        }

        return 0;
}

static void log_close_kmsg(void) {
        /* See comment in log_close_journal() */
        (void) safe_close(TAKE_FD(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;

        kmsg_fd = fd_move_above_stdio(kmsg_fd);
        return 0;
}

static void log_close_syslog(void) {
        /* See comment in log_close_journal() */
        (void) safe_close(TAKE_FD(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;

        fd = fd_move_above_stdio(fd);
        (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_cached() == 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) {
        int r;

        if (syslog_fd >= 0)
                return 0;

        syslog_fd = create_log_socket(SOCK_DGRAM);
        if (syslog_fd < 0) {
                r = syslog_fd;
                goto fail;
        }

        r = connect_unix_path(syslog_fd, AT_FDCWD, "/dev/log");
        if (r < 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;
                }

                r = connect_unix_path(syslog_fd, AT_FDCWD, "/dev/log");
                if (r < 0)
                        goto fail;

                syslog_is_stream = true;
        } else
                syslog_is_stream = false;

        return 0;

fail:
        log_close_syslog();
        return r;
}

static void log_close_journal(void) {
        /* If the journal FD is bad, safe_close will fail, and will try to log, which will fail, so we'll
         * try to close the journal FD, which is bad, so safe_close will fail... Whether we can close it
         * or not, invalidate it immediately so that we don't get in a recursive loop until we run out of
         * stack. */
        (void) safe_close(TAKE_FD(journal_fd));
}

static int log_open_journal(void) {
        int r;

        if (journal_fd >= 0)
                return 0;

        journal_fd = create_log_socket(SOCK_DGRAM);
        if (journal_fd < 0) {
                r = journal_fd;
                goto fail;
        }

        r = connect_unix_path(journal_fd, AT_FDCWD, "/run/systemd/journal/socket");
        if (r < 0)
                goto fail;

        return 0;

fail:
        log_close_journal();
        return r;
}

bool stderr_is_journal(void) {
        _cleanup_free_ char *w = NULL;
        const char *e;
        uint64_t dev, ino;
        struct stat st;

        e = getenv("JOURNAL_STREAM");
        if (!e)
                return false;

        if (extract_first_word(&e, &w, ":", EXTRACT_DONT_COALESCE_SEPARATORS) <= 0)
                return false;
        if (!e)
                return false;

        if (safe_atou64(w, &dev) < 0)
                return false;
        if (safe_atou64(e, &ino) < 0)
                return false;

        if (fstat(STDERR_FILENO, &st) < 0)
                return false;

        return st.st_dev == dev && st.st_ino == ino;
}

int log_open(void) {
        int r;

        /* Do not call from library code. */

        /* This function is often called in preparation for logging. Let's make sure we don't clobber errno,
         * so that a call to a logging function immediately following a log_open() call can still easily
         * reference an error that happened immediately before the log_open() call. */
        PROTECT_ERRNO;

        /* 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 too, so that we are not confused by somebody deleting the socket in the fs, and to
         * make sure we don't use it if prohibit_ipc is set. 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 (getpid_cached() == 1 ||
            stderr_is_journal() ||
            IN_SET(log_target,
                   LOG_TARGET_KMSG,
                   LOG_TARGET_JOURNAL,
                   LOG_TARGET_JOURNAL_OR_KMSG,
                   LOG_TARGET_SYSLOG,
                   LOG_TARGET_SYSLOG_OR_KMSG)) {

                if (!prohibit_ipc) {
                        if (IN_SET(log_target,
                                   LOG_TARGET_AUTO,
                                   LOG_TARGET_JOURNAL_OR_KMSG,
                                   LOG_TARGET_JOURNAL)) {

                                r = log_open_journal();
                                if (r >= 0) {
                                        log_close_syslog();
                                        log_close_console();
                                        return r;
                                }
                        }

                        if (IN_SET(log_target,
                                   LOG_TARGET_SYSLOG_OR_KMSG,
                                   LOG_TARGET_SYSLOG)) {

                                r = log_open_syslog();
                                if (r >= 0) {
                                        log_close_journal();
                                        log_close_console();
                                        return r;
                                }
                        }
                }

                if (IN_SET(log_target, LOG_TARGET_AUTO,
                                       LOG_TARGET_JOURNAL_OR_KMSG,
                                       LOG_TARGET_SYSLOG_OR_KMSG,
                                       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_set_target_and_open(LogTarget target) {
        log_set_target(target);
        log_open();
}

void log_close(void) {
        /* Do not call from library code. */

        log_close_journal();
        log_close_syslog();
        log_close_kmsg();
        log_close_console();
}

void log_forget_fds(void) {
        /* Do not call from library code. */

        console_fd = kmsg_fd = syslog_fd = journal_fd = -EBADF;
        console_fd_is_tty = -1;
}

int log_set_max_level(int level) {
        assert(level == LOG_NULL || log_level_is_valid(level));

        int old = log_max_level;
        log_max_level = level;

        /* Also propagate max log level to libc's syslog(), just in case some other component loaded into our
         * process logs directly via syslog(). You might wonder why we maintain our own log level variable if
         * libc has the same functionality. This has multiple reasons, first and foremost that we want to
         * apply this to all our log targets, not just syslog and console. Moreover, we cannot query the
         * current log mask from glibc without changing it, but that's useful for testing the current log
         * level before even entering the log functions like we do in our macros. */
        setlogmask(LOG_UPTO(level));

        /* Ensure that our own LOG_NULL define maps sanely to the log mask */
        assert_cc(LOG_UPTO(LOG_NULL) == 0);

        return old;
}

void log_set_facility(int facility) {
        log_facility = facility;
}

static bool check_console_fd_is_tty(void) {
        if (console_fd < 0)
                return false;

        if (console_fd_is_tty < 0)
                console_fd_is_tty = isatty_safe(console_fd);

        return console_fd_is_tty;
}

static int write_to_console(
                int level,
                int error,
                const char *file,
                int line,
                const char *func,
                const char *buffer) {

        static int dumb = -1;

        char location[256],
             header_time[FORMAT_TIMESTAMP_MAX],
             prefix[1 + DECIMAL_STR_MAX(int) + 2],
             tid_string[3 + DECIMAL_STR_MAX(pid_t) + 1];
        struct iovec iovec[11];
        const char *on = NULL, *off = NULL;
        size_t n = 0;

        if (console_fd < 0)
                return 0;

        if (dumb < 0)
                dumb = getenv_terminal_is_dumb();

        if (LOG_PRI(level) > log_target_max_level[LOG_TARGET_CONSOLE])
                return 0;

        if (log_target == LOG_TARGET_CONSOLE_PREFIXED) {
                xsprintf(prefix, "<%i>", level);
                iovec[n++] = IOVEC_MAKE_STRING(prefix);
        }

        if (show_time &&
            format_timestamp(header_time, sizeof(header_time), now(CLOCK_REALTIME))) {
                iovec[n++] = IOVEC_MAKE_STRING(header_time);
                iovec[n++] = IOVEC_MAKE_STRING(" ");
        }

        if (show_tid) {
                xsprintf(tid_string, "(" PID_FMT ") ", gettid());
                iovec[n++] = IOVEC_MAKE_STRING(tid_string);
        }

        if (log_get_show_color())
                get_log_colors(LOG_PRI(level), &on, &off, NULL);

        if (show_location) {
                const char *lon = "", *loff = "";
                if (log_get_show_color()) {
                        lon = ansi_highlight_yellow4();
                        loff = ansi_normal();
                }

                (void) snprintf(location, sizeof location, "%s%s:%i%s: ", lon, file, line, loff);
                iovec[n++] = IOVEC_MAKE_STRING(location);
        }

        if (on)
                iovec[n++] = IOVEC_MAKE_STRING(on);
        if (log_prefix) {
                iovec[n++] = IOVEC_MAKE_STRING(log_prefix);
                iovec[n++] = IOVEC_MAKE_STRING(": ");
        }
        iovec[n++] = IOVEC_MAKE_STRING(buffer);
        if (off)
                iovec[n++] = IOVEC_MAKE_STRING(off);

        /* When writing to a TTY we output an extra '\r' (i.e. CR) first, to generate CRNL rather than just
         * NL. This is a robustness thing in case the TTY is currently in raw mode (specifically: has the
         * ONLCR flag off). We want that subsequent output definitely starts at the beginning of the line
         * again, after all. If the TTY is not in raw mode the extra CR should not hurt. If we're writing to
         * a dumb terminal, only write NL as CRNL might be interpreted as a double newline. */
        iovec[n++] = IOVEC_MAKE_STRING(check_console_fd_is_tty() && !dumb ? "\r\n" : "\n");

        if (writev(console_fd, iovec, n) < 0) {

                if (errno == EIO && getpid_cached() == 1) {

                        /* If somebody tried to kick us from our console tty (via vhangup() or suchlike), try
                         * to reconnect. */

                        log_close_console();
                        (void) 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 tm tm;
        int r;

        if (syslog_fd < 0)
                return 0;

        if (LOG_PRI(level) > log_target_max_level[LOG_TARGET_SYSLOG])
                return 0;

        xsprintf(header_priority, "<%i>", level);

        r = localtime_or_gmtime_usec(now(CLOCK_REALTIME), /* utc= */ false, &tm);
        if (r < 0)
                return r;

        if (strftime(header_time, sizeof(header_time), "%h %e %T ", &tm) <= 0)
                return -EINVAL;

        xsprintf(header_pid, "["PID_FMT"]: ", getpid_cached());

        struct iovec iovec[] = {
                IOVEC_MAKE_STRING(header_priority),
                IOVEC_MAKE_STRING(header_time),
                IOVEC_MAKE_STRING(program_invocation_short_name),
                IOVEC_MAKE_STRING(header_pid),
                IOVEC_MAKE_STRING(strempty(log_prefix)),
                IOVEC_MAKE_STRING(log_prefix ? ": " : ""),
                IOVEC_MAKE_STRING(buffer),
        };
        const struct msghdr msghdr = {
                .msg_iov = iovec,
                .msg_iovlen = ELEMENTSOF(iovec),
        };

        /* When using syslog via SOCK_STREAM separate the messages by NUL chars */
        if (syslog_is_stream)
                iovec[ELEMENTSOF(iovec) - 1].iov_len++;

        for (;;) {
                ssize_t n;

                n = sendmsg(syslog_fd, &msghdr, MSG_NOSIGNAL);
                if (n < 0)
                        return -errno;

                if (!syslog_is_stream)
                        break;

                if (iovec_inc_many(iovec, ELEMENTSOF(iovec), n))
                        break;
        }

        return 1;
}

static int write_to_kmsg(
                int level,
                int error,
                const char *file,
                int line,
                const char *func,
                const char *buffer) {

        /* Set a ratelimit on the amount of messages logged to /dev/kmsg. This is mostly supposed to be a
         * safety catch for the case where start indiscriminately logging in a loop. It will not catch cases
         * where we log excessively, but not in a tight loop.
         *
         * Note that this ratelimit is per-emitter, so we might still overwhelm /dev/kmsg with multiple
         * loggers.
         */
        static thread_local RateLimit ratelimit = { 5 * USEC_PER_SEC, 200 };

        char header_priority[2 + DECIMAL_STR_MAX(int) + 1],
             header_pid[4 + DECIMAL_STR_MAX(pid_t) + 1];

        if (kmsg_fd < 0)
                return 0;

        if (LOG_PRI(level) > log_target_max_level[LOG_TARGET_KMSG])
                return 0;

        if (ratelimit_kmsg && !ratelimit_below(&ratelimit)) {
                if (ratelimit_num_dropped(&ratelimit) > 1)
                        return 0;

                buffer = "Too many messages being logged to kmsg, ignoring";
        }

        xsprintf(header_priority, "<%i>", level);
        xsprintf(header_pid, "["PID_FMT"]: ", getpid_cached());

        const struct iovec iovec[] = {
                IOVEC_MAKE_STRING(header_priority),
                IOVEC_MAKE_STRING(program_invocation_short_name),
                IOVEC_MAKE_STRING(header_pid),
                IOVEC_MAKE_STRING(strempty(log_prefix)),
                IOVEC_MAKE_STRING(log_prefix ? ": " : ""),
                IOVEC_MAKE_STRING(buffer),
                IOVEC_MAKE_STRING("\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) {
        int r;

        error = IS_SYNTHETIC_ERRNO(error) ? 0 : ERRNO_VALUE(error);

        r = snprintf(header, size,
                     "PRIORITY=%i\n"
                     "SYSLOG_FACILITY=%i\n"
                     "TID=" PID_FMT "\n"
                     "%s%.256s%s"        /* CODE_FILE */
                     "%s%.*i%s"          /* CODE_LINE */
                     "%s%.256s%s"        /* CODE_FUNC */
                     "%s%.*i%s"          /* ERRNO */
                     "%s%.256s%s"        /* object */
                     "%s%.256s%s"        /* extra */
                     "SYSLOG_IDENTIFIER=%.256s\n",
                     LOG_PRI(level),
                     LOG_FAC(level),
                     gettid(),
                     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_FUNC=",
                     isempty(func) ? "" : func,
                     isempty(func) ? "" : "\n",
                     error ? "ERRNO=" : "",
                     error ? 1 : 0, error,
                     error ? "\n" : "",
                     isempty(object) ? "" : ASSERT_PTR(object_field),
                     isempty(object) ? "" : object,
                     isempty(object) ? "" : "\n",
                     isempty(extra) ? "" : ASSERT_PTR(extra_field),
                     isempty(extra) ? "" : extra,
                     isempty(extra) ? "" : "\n",
                     program_invocation_short_name);
        assert_raw((size_t) r < size);

        return 0;
}

static void log_do_context(struct iovec *iovec, size_t iovec_len, size_t *n) {
        assert(iovec);
        assert(n);

        LIST_FOREACH(ll, c, log_context_head()) {
                STRV_FOREACH(s, c->fields) {
                        if (*n + 2 >= iovec_len)
                                return;

                        iovec[(*n)++] = IOVEC_MAKE_STRING(*s);
                        iovec[(*n)++] = IOVEC_MAKE_STRING("\n");
                }

                for (size_t i = 0; i < c->n_input_iovec; i++) {
                        if (*n + 2 >= iovec_len)
                                return;

                        iovec[(*n)++] = c->input_iovec[i];
                        iovec[(*n)++] = IOVEC_MAKE_STRING("\n");
                }

                if (c->key && c->value) {
                        if (*n + 3 >= iovec_len)
                                return;

                        iovec[(*n)++] = IOVEC_MAKE_STRING(c->key);
                        iovec[(*n)++] = IOVEC_MAKE_STRING(c->value);
                        iovec[(*n)++] = IOVEC_MAKE_STRING("\n");
                }
        }
}

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];
        size_t n = 0, iovec_len;
        struct iovec *iovec;

        if (journal_fd < 0)
                return 0;

        if (LOG_PRI(level) > log_target_max_level[LOG_TARGET_JOURNAL])
                return 0;

        if (!MUL_SAFE(&iovec_len, log_context_num_fields(), 3) ||
            !ADD_SAFE(&iovec_len, iovec_len, 6))
                iovec_len = IOVEC_MAX;
        else
                iovec_len = MIN(iovec_len, IOVEC_MAX);
        iovec = newa(struct iovec, iovec_len);

        log_do_header(header, sizeof(header), level, error, file, line, func, object_field, object, extra_field, extra);

        iovec[n++] = IOVEC_MAKE_STRING(header);
        iovec[n++] = IOVEC_MAKE_STRING("MESSAGE=");
        if (log_prefix) {
                iovec[n++] = IOVEC_MAKE_STRING(log_prefix);
                iovec[n++] = IOVEC_MAKE_STRING(": ");
        }
        iovec[n++] = IOVEC_MAKE_STRING(buffer);
        iovec[n++] = IOVEC_MAKE_STRING("\n");

        log_do_context(iovec, iovec_len, &n);

        const struct msghdr msghdr = {
                .msg_iov = iovec,
                .msg_iovlen = n,
        };

        if (sendmsg(journal_fd, &msghdr, MSG_NOSIGNAL) < 0)
                return -errno;

        return 1;
}

int log_dispatch_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,
                char *buffer) {

        assert_raw(buffer);

        if (log_target == LOG_TARGET_NULL)
                return -ERRNO_VALUE(error);

        /* Patch in LOG_DAEMON facility if necessary */
        if (LOG_FAC(level) == 0)
                level |= log_facility;

        if (open_when_needed)
                (void) log_open();

        do {
                char *e;
                int k = 0;

                buffer += strspn(buffer, NEWLINE);

                if (buffer[0] == 0)
                        break;

                if ((e = strpbrk(buffer, NEWLINE)))
                        *(e++) = 0;

                if (IN_SET(log_target, LOG_TARGET_AUTO,
                                       LOG_TARGET_JOURNAL_OR_KMSG,
                                       LOG_TARGET_JOURNAL)) {

                        k = write_to_journal(level, error, file, line, func, object_field, object, extra_field, extra, buffer);
                        if (k < 0 && k != -EAGAIN)
                                log_close_journal();
                }

                if (IN_SET(log_target, LOG_TARGET_SYSLOG_OR_KMSG,
                                       LOG_TARGET_SYSLOG)) {

                        k = write_to_syslog(level, error, file, line, func, buffer);
                        if (k < 0 && k != -EAGAIN)
                                log_close_syslog();
                }

                if (k <= 0 &&
                    IN_SET(log_target, LOG_TARGET_AUTO,
                                       LOG_TARGET_SYSLOG_OR_KMSG,
                                       LOG_TARGET_JOURNAL_OR_KMSG,
                                       LOG_TARGET_KMSG)) {

                        if (k < 0)
                                log_open_kmsg();

                        k = write_to_kmsg(level, error, file, line, func, buffer);
                        if (k < 0) {
                                log_close_kmsg();
                                (void) log_open_console();
                        }
                }

                if (k <= 0)
                        (void) write_to_console(level, error, file, line, func, buffer);

                buffer = e;
        } while (buffer);

        if (open_when_needed)
                log_close();

        return -ERRNO_VALUE(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 (_likely_(LOG_PRI(level) > log_max_level))
                return -ERRNO_VALUE(error);

        return log_dispatch_internal(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) {

        if (_likely_(LOG_PRI(level) > log_max_level))
                return -ERRNO_VALUE(error);

        /* Make sure that %m maps to the specified error (or "Success"). */
        char buffer[LINE_MAX];
        LOCAL_ERRNO(ERRNO_VALUE(error));

        (void) vsnprintf(buffer, sizeof buffer, format, ap);

        return log_dispatch_internal(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) {

        char *buffer, *b;

        if (_likely_(LOG_PRI(level) > log_max_level))
                return -ERRNO_VALUE(error);

        /* Make sure that %m maps to the specified error (or "Success"). */
        LOCAL_ERRNO(ERRNO_VALUE(error));

        LOG_SET_PREFIX(object);

        b = buffer = newa(char, LINE_MAX);
        (void) vsnprintf(b, LINE_MAX, format, ap);

        return log_dispatch_internal(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;
}

int log_oom_internal(int level, const char *file, int line, const char *func) {
        return log_internal(level, ENOMEM, file, line, func, "Out of memory.");
}

int log_format_iovec(
                struct iovec *iovec,
                size_t iovec_len,
                size_t *n,
                bool newline_separator,
                int error,
                const char *format,
                va_list ap) {

        assert(iovec);
        assert(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 */

                errno = ERRNO_VALUE(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[(*n)++] = IOVEC_MAKE_STRING(m);
                if (newline_separator)
                        iovec[(*n)++] = IOVEC_MAKE_STRING("\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 (_likely_(LOG_PRI(level) > log_max_level) ||
            log_target == LOG_TARGET_NULL)
                return -ERRNO_VALUE(error);

        if (LOG_FAC(level) == 0)
                level |= log_facility;

        if (IN_SET(log_target,
                   LOG_TARGET_AUTO,
                   LOG_TARGET_JOURNAL_OR_KMSG,
                   LOG_TARGET_JOURNAL)) {

                if (open_when_needed)
                        log_open_journal();

                if (journal_fd >= 0) {
                        char header[LINE_MAX];
                        struct iovec *iovec;
                        size_t n = 0, m, iovec_len;
                        int r;
                        bool fallback = false;

                        if (!MUL_SAFE(&iovec_len, log_context_num_fields(), 3) ||
                            !ADD_SAFE(&iovec_len, iovec_len, 17))
                                iovec_len = IOVEC_MAX;
                        else
                                iovec_len = MIN(iovec_len, IOVEC_MAX);
                        iovec = newa(struct iovec, iovec_len);

                        /* If the journal is available do structured logging.
                         * Do not report the errno if it is synthetic. */
                        log_do_header(header, sizeof(header), level, error, file, line, func, NULL, NULL, NULL, NULL);
                        iovec[n++] = IOVEC_MAKE_STRING(header);

                        va_start(ap, format);
                        DISABLE_WARNING_FORMAT_NONLITERAL;
                        r = log_format_iovec(iovec, iovec_len, &n, true, error, format, ap);
                        REENABLE_WARNING;
                        m = n;
                        if (r < 0)
                                fallback = true;
                        else {
                                log_do_context(iovec, iovec_len, &n);

                                const struct msghdr msghdr = {
                                        .msg_iov = iovec,
                                        .msg_iovlen = n,
                                };

                                (void) sendmsg(journal_fd, &msghdr, MSG_NOSIGNAL);
                        }

                        va_end(ap);
                        for (size_t i = 1; i < m; i += 2)
                                free(iovec[i].iov_base);

                        if (!fallback) {
                                if (open_when_needed)
                                        log_close();

                                return -ERRNO_VALUE(error);
                        }
                }
        }

        /* Fallback if journal logging is not available or didn't work. */

        va_start(ap, format);
        while (format) {
                va_list aq;

                errno = ERRNO_VALUE(error);

                va_copy(aq, ap);
                DISABLE_WARNING_FORMAT_NONLITERAL;
                (void) vsnprintf(buf, sizeof buf, format, aq);
                REENABLE_WARNING;
                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) {
                if (open_when_needed)
                        log_close();

                return -ERRNO_VALUE(error);
        }

        return log_dispatch_internal(level, error, file, line, func, NULL, NULL, NULL, NULL, buf + 8);
}

int log_struct_iovec_internal(
                int level,
                int error,
                const char *file,
                int line,
                const char *func,
                const struct iovec input_iovec[],
                size_t n_input_iovec) {

        PROTECT_ERRNO;

        if (_likely_(LOG_PRI(level) > log_max_level) ||
            log_target == LOG_TARGET_NULL)
                return -ERRNO_VALUE(error);

        if (LOG_FAC(level) == 0)
                level |= log_facility;

        if (IN_SET(log_target, LOG_TARGET_AUTO,
                               LOG_TARGET_JOURNAL_OR_KMSG,
                               LOG_TARGET_JOURNAL) &&
            journal_fd >= 0) {

                char header[LINE_MAX];
                struct iovec *iovec;
                size_t n = 0, iovec_len, n_context_iovec, n_input_iovec_expanded;

                if (!MUL_SAFE(&n_input_iovec_expanded, n_input_iovec, 2) ||
                    !MUL_SAFE(&n_context_iovec, log_context_num_fields(), 3) ||
                    !ADD_SAFE(&iovec_len, 1, n_input_iovec_expanded) ||
                    !ADD_SAFE(&iovec_len, iovec_len, n_context_iovec))
                        iovec_len = IOVEC_MAX;
                else
                        iovec_len = MIN(iovec_len, IOVEC_MAX);
                iovec = newa(struct iovec, iovec_len);

                log_do_header(header, sizeof(header), level, error, file, line, func, NULL, NULL, NULL, NULL);

                iovec[n++] = IOVEC_MAKE_STRING(header);
                for (size_t i = 0; i < n_input_iovec && n + 2 <= iovec_len; i++) {
                        iovec[n++] = input_iovec[i];
                        iovec[n++] = IOVEC_MAKE_STRING("\n");
                }

                log_do_context(iovec, iovec_len, &n);

                const struct msghdr msghdr = {
                        .msg_iov = iovec,
                        .msg_iovlen = n,
                };

                if (sendmsg(journal_fd, &msghdr, MSG_NOSIGNAL) >= 0)
                        return -ERRNO_VALUE(error);
        }

        for (size_t i = 0; i < n_input_iovec; i++)
                if (memory_startswith(input_iovec[i].iov_base, input_iovec[i].iov_len, "MESSAGE=")) {
                        char *m;

                        m = strndupa_safe((char*) input_iovec[i].iov_base + STRLEN("MESSAGE="),
                                          input_iovec[i].iov_len - STRLEN("MESSAGE="));

                        return log_dispatch_internal(level, error, file, line, func, NULL, NULL, NULL, NULL, m);
                }

        /* Couldn't find MESSAGE=. */
        return -ERRNO_VALUE(error);
}

int log_set_target_from_string(const char *e) {
        LogTarget t;

        t = log_target_from_string(e);
        if (t < 0)
                return t;

        log_set_target(t);
        return 0;
}

int log_set_max_level_from_string(const char *e) {
        int r;

        for (;;) {
                _cleanup_free_ char *word = NULL, *prefix = NULL;
                LogTarget target;
                const char *colon;

                r = extract_first_word(&e, &word, ",", 0);
                if (r < 0)
                        return r;
                if (r == 0)
                        break;

                colon = strchr(word, ':');
                if (!colon) {
                        r = log_level_from_string(word);
                        if (r < 0)
                                return r;

                        log_set_max_level(r);
                        continue;
                }

                prefix = strndup(word, colon - word);
                if (!prefix)
                        return -ENOMEM;

                target = log_target_from_string(prefix);
                if (target < 0)
                        return target;

                if (target >= _LOG_TARGET_SINGLE_MAX)
                        return -EINVAL;

                r = log_level_from_string(colon + 1);
                if (r < 0)
                        return r;

                log_target_max_level[target] = r;
        }

        return 0;
}

int log_max_levels_to_string(int level, char **ret) {
        _cleanup_free_ char *s = NULL;
        int r;

        assert(ret);

        r = log_level_to_string_alloc(level, &s);
        if (r < 0)
                return r;

        for (LogTarget target = 0; target < _LOG_TARGET_SINGLE_MAX; target++) {
                _cleanup_free_ char *l = NULL;

                if (log_target_max_level[target] == INT_MAX)
                        continue;

                r = log_level_to_string_alloc(log_target_max_level[target], &l);
                if (r < 0)
                        return r;

                r = strextendf_with_separator(&s, ",", "%s:%s", log_target_to_string(target), l);
                if (r < 0)
                        return r;
        }

        *ret = TAKE_PTR(s);
        return 0;
}

static int log_set_ratelimit_kmsg_from_string(const char *e) {
        int r;

        r = parse_boolean(e);
        if (r < 0)
                return r;

        ratelimit_kmsg = r;
        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 (proc_cmdline_key_streq(key, "systemd.log_target")) {

                if (proc_cmdline_value_missing(key, value))
                        return 0;

                if (log_set_target_from_string(value) < 0)
                        log_warning("Failed to parse log target '%s', ignoring.", value);

        } else if (proc_cmdline_key_streq(key, "systemd.log_level")) {

                if (proc_cmdline_value_missing(key, value))
                        return 0;

                if (log_set_max_level_from_string(value) < 0)
                        log_warning("Failed to parse log level setting '%s', ignoring.", value);

        } else if (proc_cmdline_key_streq(key, "systemd.log_color")) {

                if (log_show_color_from_string(value ?: "1") < 0)
                        log_warning("Failed to parse log color setting '%s', ignoring.", value);

        } else if (proc_cmdline_key_streq(key, "systemd.log_location")) {

                if (log_show_location_from_string(value ?: "1") < 0)
                        log_warning("Failed to parse log location setting '%s', ignoring.", value);

        } else if (proc_cmdline_key_streq(key, "systemd.log_tid")) {

                if (log_show_tid_from_string(value ?: "1") < 0)
                        log_warning("Failed to parse log tid setting '%s', ignoring.", value);

        } else if (proc_cmdline_key_streq(key, "systemd.log_time")) {

                if (log_show_time_from_string(value ?: "1") < 0)
                        log_warning("Failed to parse log time setting '%s', ignoring.", value);

        } else if (proc_cmdline_key_streq(key, "systemd.log_ratelimit_kmsg")) {

                if (log_set_ratelimit_kmsg_from_string(value ?: "1") < 0)
                        log_warning("Failed to parse log ratelimit kmsg boolean '%s', ignoring.", value);
        }

        return 0;
}

static bool should_parse_proc_cmdline(void) {
        /* PID1 always reads the kernel command line. */
        if (getpid_cached() == 1)
                return true;

        /* Otherwise, parse the command line if invoked directly by systemd. */
        return invoked_by_systemd();
}

void log_parse_environment_variables(void) {
        const char *e;
        int r;

        e = getenv("SYSTEMD_LOG_TARGET");
        if (e && log_set_target_from_string(e) < 0)
                log_warning("Failed to parse log target '%s', ignoring.", e);

        e = getenv("SYSTEMD_LOG_LEVEL");
        if (e) {
                r = log_set_max_level_from_string(e);
                if (r < 0)
                        log_warning_errno(r, "Failed to parse log level '%s', ignoring: %m", e);
        } else {
                /* If no explicit log level is specified then let's see if this is a debug invocation, and if
                 * so raise the log level to debug too. Note that this is not symmetric: just because
                 * DEBUG_INVOCATION is explicitly set to 0 we won't lower the log level below debug. This
                 * follows the logic that debug logging is an opt-in thing anyway, and if there's any reason
                 * to enable it we should not disable it here automatically. */
                r = getenv_bool("DEBUG_INVOCATION");
                if (r < 0 && r != -ENXIO)
                        log_warning_errno(r, "Failed to parse $DEBUG_INVOCATION value, ignoring: %m");
                else if (r > 0)
                        log_set_max_level(LOG_DEBUG);
        }

        e = getenv("SYSTEMD_LOG_COLOR");
        if (e && log_show_color_from_string(e) < 0)
                log_warning("Failed to parse log color '%s', ignoring.", e);

        e = getenv("SYSTEMD_LOG_LOCATION");
        if (e && log_show_location_from_string(e) < 0)
                log_warning("Failed to parse log location '%s', ignoring.", e);

        e = getenv("SYSTEMD_LOG_TIME");
        if (e && log_show_time_from_string(e) < 0)
                log_warning("Failed to parse log time '%s', ignoring.", e);

        e = getenv("SYSTEMD_LOG_TID");
        if (e && log_show_tid_from_string(e) < 0)
                log_warning("Failed to parse log tid '%s', ignoring.", e);

        e = getenv("SYSTEMD_LOG_RATELIMIT_KMSG");
        if (e && log_set_ratelimit_kmsg_from_string(e) < 0)
                log_warning("Failed to parse log ratelimit kmsg boolean '%s', ignoring.", e);
}

void log_parse_environment(void) {
        /* Do not call from library code. */

        if (should_parse_proc_cmdline())
                (void) proc_cmdline_parse(parse_proc_cmdline_item, NULL, PROC_CMDLINE_STRIP_RD_PREFIX);

        log_parse_environment_variables();
}

LogTarget log_get_target(void) {
        return log_target;
}

void log_settle_target(void) {

        /* If we're using LOG_TARGET_AUTO and opening the log again on every single log call, we'll check if
         * stderr is attached to the journal every single log call. However, if we then close all file
         * descriptors later, that will stop working because stderr will be closed as well. To avoid that
         * problem, this function is used to permanently change the log target depending on whether stderr is
         * connected to the journal or not. */

        LogTarget t = log_get_target();

        if (t != LOG_TARGET_AUTO)
                return;

        t = getpid_cached() == 1 || stderr_is_journal() ? (prohibit_ipc ? LOG_TARGET_KMSG : LOG_TARGET_JOURNAL_OR_KMSG)
                                                        : LOG_TARGET_CONSOLE;
        log_set_target(t);
}

int log_get_max_level(void) {
        return log_max_level;
}

int log_get_target_max_level(LogTarget target) {
        assert(target >= 0);
        assert(target < _LOG_TARGET_SINGLE_MAX);
        return log_target_max_level[target];
}

void log_show_color(bool b) {
        show_color = b;
}

bool log_get_show_color(void) {
        return show_color > 0; /* Defaults to false. */
}

void log_show_location(bool b) {
        show_location = b;
}

bool log_get_show_location(void) {
        return show_location;
}

void log_show_time(bool b) {
        show_time = b;
}

bool log_get_show_time(void) {
        return show_time;
}

void log_show_tid(bool b) {
        show_tid = b;
}

bool log_get_show_tid(void) {
        return show_tid;
}

int log_show_color_from_string(const char *e) {
        int r;

        r = parse_boolean(e);
        if (r < 0)
                return r;

        log_show_color(r);
        return 0;
}

int log_show_location_from_string(const char *e) {
        int r;

        r = parse_boolean(e);
        if (r < 0)
                return r;

        log_show_location(r);
        return 0;
}

int log_show_time_from_string(const char *e) {
        int r;

        r = parse_boolean(e);
        if (r < 0)
                return r;

        log_show_time(r);
        return 0;
}

int log_show_tid_from_string(const char *e) {
        int r;

        r = parse_boolean(e);
        if (r < 0)
                return r;

        log_show_tid(r);
        return 0;
}

bool log_on_console(void) {
        if (IN_SET(log_target, LOG_TARGET_CONSOLE,
                               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_NULL]             = "null",
};

DEFINE_STRING_TABLE_LOOKUP(log_target, LogTarget);

void log_received_signal(int level, const struct signalfd_siginfo *si) {
        assert(si);

        if (si_code_from_process(si->ssi_code) && pid_is_valid(si->ssi_pid)) {
                _cleanup_free_ char *p = NULL;

                (void) pid_get_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 set_log_syntax_callback(log_syntax_callback_t cb, void *userdata) {
        assert(!log_syntax_callback || !cb);
        assert(!log_syntax_callback_userdata || !userdata);

        log_syntax_callback = cb;
        log_syntax_callback_userdata = userdata;
}

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;

        if (log_syntax_callback)
                log_syntax_callback(unit, level, log_syntax_callback_userdata);

        if (_likely_(LOG_PRI(level) > log_max_level) ||
            log_target == LOG_TARGET_NULL)
                return -ERRNO_VALUE(error);

        char buffer[LINE_MAX];
        va_list ap;
        const char *unit_fmt = NULL;

        errno = ERRNO_VALUE(error);

        va_start(ap, format);
        (void) vsnprintf(buffer, sizeof buffer, format, ap);
        va_end(ap);

        if (unit)
                unit_fmt = getpid_cached() == 1 ? "UNIT=%s" : "USER_UNIT=%s";

        if (config_file) {
                if (config_line > 0)
                        return log_struct_internal(
                                        level,
                                        error,
                                        file, line, func,
                                        LOG_MESSAGE_ID(SD_MESSAGE_INVALID_CONFIGURATION_STR),
                                        LOG_ITEM("CONFIG_FILE=%s", config_file),
                                        LOG_ITEM("CONFIG_LINE=%u", config_line),
                                        LOG_MESSAGE("%s:%u: %s", config_file, config_line, buffer),
                                        unit_fmt, unit,
                                        NULL);
                else
                        return log_struct_internal(
                                        level,
                                        error,
                                        file, line, func,
                                        LOG_MESSAGE_ID(SD_MESSAGE_INVALID_CONFIGURATION_STR),
                                        LOG_ITEM("CONFIG_FILE=%s", config_file),
                                        LOG_MESSAGE("%s: %s", config_file, buffer),
                                        unit_fmt, unit,
                                        NULL);
        } else if (unit)
                return log_struct_internal(
                                level,
                                error,
                                file, line, func,
                                LOG_MESSAGE_ID(SD_MESSAGE_INVALID_CONFIGURATION_STR),
                                LOG_MESSAGE("%s: %s", unit, buffer),
                                unit_fmt, unit,
                                NULL);
        else
                return log_struct_internal(
                                level,
                                error,
                                file, line, func,
                                LOG_MESSAGE_ID(SD_MESSAGE_INVALID_CONFIGURATION_STR),
                                LOG_MESSAGE("%s", buffer),
                                NULL);
}

int log_syntax_invalid_utf8_internal(
                const char *unit,
                int level,
                const char *config_file,
                unsigned config_line,
                const char *file,
                int line,
                const char *func,
                const char *rvalue) {

        PROTECT_ERRNO;
        _cleanup_free_ char *p = NULL;

        if (rvalue)
                p = utf8_escape_invalid(rvalue);

        return log_syntax_internal(unit, level, config_file, config_line,
                                   SYNTHETIC_ERRNO(EINVAL), file, line, func,
                                   "String is not UTF-8 clean, ignoring assignment: %s", strna(p));
}

int log_syntax_parse_error_internal(
                const char *unit,
                const char *config_file,
                unsigned config_line,
                int error,
                bool critical,
                const char *file,
                int line,
                const char *func,
                const char *lvalue,
                const char *rvalue) {

        PROTECT_ERRNO;
        _cleanup_free_ char *escaped = NULL;

        /* OOM is always handled as critical. */
        if (ERRNO_VALUE(error) == ENOMEM)
                return log_oom_internal(LOG_ERR, file, line, func);

        if (rvalue && !utf8_is_valid(rvalue)) {
                escaped = utf8_escape_invalid(rvalue);
                if (!escaped)
                        rvalue = "(oom)";
                else
                        rvalue = " (escaped)";
        }

        log_syntax_internal(unit, critical ? LOG_ERR : LOG_WARNING, config_file, config_line, error,
                            file, line, func,
                            "Failed to parse %s=%s%s%s%s%s",
                            strna(lvalue), strempty(escaped), strempty(rvalue),
                            critical ? "" : ", ignoring",
                            error == 0 ? "." : ": ",
                            error == 0 ? "" : STRERROR(error));

        return critical ? -ERRNO_VALUE(error) : 0;
}

void log_set_upgrade_syslog_to_journal(bool b) {
        upgrade_syslog_to_journal = b;

        /* Make the change effective immediately */
        if (b) {
                if (log_target == LOG_TARGET_SYSLOG)
                        log_target = LOG_TARGET_JOURNAL;
                else if (log_target == LOG_TARGET_SYSLOG_OR_KMSG)
                        log_target = LOG_TARGET_JOURNAL_OR_KMSG;
        }
}

void log_set_always_reopen_console(bool b) {
        always_reopen_console = b;
}

void log_set_open_when_needed(bool b) {
        open_when_needed = b;
}

void log_set_prohibit_ipc(bool b) {
        prohibit_ipc = b;
}

int log_emergency_level(void) {
        /* Returns the log level to use for log_emergency() logging. We use LOG_EMERG only when we are PID 1, as only
         * then the system of the whole system is obviously affected. */

        return getpid_cached() == 1 ? LOG_EMERG : LOG_ERR;
}

int log_dup_console(void) {
        int copy;

        /* Duplicate the fd we use for fd logging if it's < 3 and use the copy from now on. This call is useful
         * whenever we want to continue logging through the original fd, but want to rearrange stderr. */

        if (console_fd < 0 || console_fd >= 3)
                return 0;

        copy = fcntl(console_fd, F_DUPFD_CLOEXEC, 3);
        if (copy < 0)
                return -errno;

        console_fd = copy;
        return 0;
}

void log_setup(void) {
        log_set_target(LOG_TARGET_AUTO);
        log_parse_environment();
        (void) log_open();
        if (log_on_console() && show_color < 0)
                log_show_color(true);
}

const char* _log_set_prefix(const char *prefix, bool force) {
        const char *old = log_prefix;

        if (prefix || force)
                log_prefix = prefix;

        return old;
}

systemd / systemd / 29378720657

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