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Systemd/src/basic/log.c
Zbigniew Jędrzejewski-Szmek 11a1589223 tree-wide: drop license boilerplate 
Files which are installed as-is (any .service and other unit files, .conf
files, .policy files, etc), are left as is. My assumption is that SPDX
identifiers are not yet that well known, so it's better to retain the
extended header to avoid any doubt.

I also kept any copyright lines. We can probably remove them, but it'd nice to
obtain explicit acks from all involved authors before doing that.
2018-04-06 18:58:55 +02:00

1338 lines
40 KiB
C
Raw Blame History

/* SPDX-License-Identifier: LGPL-2.1+ */
/***
This file is part of systemd.
Copyright 2010 Lennart Poettering
***/
#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 "format-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 "utf8.h"
#include "util.h"
#define SNDBUF_SIZE (8*1024*1024)
static LogTarget log_target = LOG_TARGET_CONSOLE;
static int log_max_level[] = {LOG_INFO, LOG_INFO};
assert_cc(ELEMENTSOF(log_max_level) == _LOG_REALM_MAX);
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;
static bool always_reopen_console = false;
static bool open_when_needed = false;
static bool prohibit_ipc = false;
/* Akin to glibc's __abort_msg; which is private and we hence cannot
* use here. */
static char *log_abort_msg = NULL;
/* 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)
static void log_close_console(void) {
console_fd = safe_close_above_stdio(console_fd);
}
static int log_open_console(void) {
if (!always_reopen_console) {
console_fd = STDERR_FILENO;
return 0;
}
if (console_fd < 3) {
console_fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC);
if (console_fd < 0)
return console_fd;
console_fd = fd_move_above_stdio(console_fd);
}
return 0;
}
static 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;
kmsg_fd = fd_move_above_stdio(kmsg_fd);
return 0;
}
static 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;
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) {
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;
}
static 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;
/* Do not call from library code. */
/* 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, 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 (log_target != LOG_TARGET_AUTO ||
getpid_cached() == 1 ||
isatty(STDERR_FILENO) <= 0) {
if (!prohibit_ipc &&
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 (!prohibit_ipc &&
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_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 = -1;
}
void log_set_max_level_realm(LogRealm realm, int level) {
assert((level & LOG_PRIMASK) == level);
assert(realm < ELEMENTSOF(log_max_level));
log_max_level[realm] = 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[n++] = IOVEC_MAKE_STRING(prefix);
}
highlight = LOG_PRI(level) <= LOG_ERR && show_color;
if (show_location) {
(void) snprintf(location, sizeof location, "(%s:%i) ", file, line);
iovec[n++] = IOVEC_MAKE_STRING(location);
}
if (highlight)
iovec[n++] = IOVEC_MAKE_STRING(ANSI_HIGHLIGHT_RED);
iovec[n++] = IOVEC_MAKE_STRING(buffer);
if (highlight)
iovec[n++] = IOVEC_MAKE_STRING(ANSI_NORMAL);
iovec[n++] = IOVEC_MAKE_STRING("\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();
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_cached());
iovec[0] = IOVEC_MAKE_STRING(header_priority);
iovec[1] = IOVEC_MAKE_STRING(header_time);
iovec[2] = IOVEC_MAKE_STRING(program_invocation_short_name);
iovec[3] = IOVEC_MAKE_STRING(header_pid);
iovec[4] = IOVEC_MAKE_STRING(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_cached());
iovec[0] = IOVEC_MAKE_STRING(header_priority);
iovec[1] = IOVEC_MAKE_STRING(program_invocation_short_name);
iovec[2] = IOVEC_MAKE_STRING(header_pid);
iovec[3] = IOVEC_MAKE_STRING(buffer);
iovec[4] = 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;
r = snprintf(header, size,
"PRIORITY=%i\n"
"SYSLOG_FACILITY=%i\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),
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) ? "" : object_field,
isempty(object) ? "" : object,
isempty(object) ? "" : "\n",
isempty(extra) ? "" : extra_field,
isempty(extra) ? "" : extra,
isempty(extra) ? "" : "\n",
program_invocation_short_name);
assert_raw((size_t) r < size);
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[0] = IOVEC_MAKE_STRING(header);
iovec[1] = IOVEC_MAKE_STRING("MESSAGE=");
iovec[2] = IOVEC_MAKE_STRING(buffer);
iovec[3] = IOVEC_MAKE_STRING("\n");
mh.msg_iov = iovec;
mh.msg_iovlen = ELEMENTSOF(iovec);
if (sendmsg(journal_fd, &mh, 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 (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);
if (open_when_needed)
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();
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 -error;
}
int log_dump_internal(
int level,
int error,
const char *file,
int line,
const char *func,
char *buffer) {
LogRealm realm = LOG_REALM_REMOVE_LEVEL(level);
PROTECT_ERRNO;
/* This modifies the buffer... */
if (error < 0)
error = -error;
if (_likely_(LOG_PRI(level) > log_max_level[realm]))
return -error;
return log_dispatch_internal(level, error, file, line, func, NULL, NULL, NULL, NULL, buffer);
}
int log_internalv_realm(
int level,
int error,
const char *file,
int line,
const char *func,
const char *format,
va_list ap) {
LogRealm realm = LOG_REALM_REMOVE_LEVEL(level);
char buffer[LINE_MAX];
PROTECT_ERRNO;
if (error < 0)
error = -error;
if (_likely_(LOG_PRI(level) > log_max_level[realm]))
return -error;
/* Make sure that %m maps to the specified error */
if (error != 0)
errno = 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_realm(
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_realm(level, error, file, line, func, format, ap);
va_end(ap);
return r;
}
_printf_(10,0)
static 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;
if (error < 0)
error = -error;
if (_likely_(LOG_PRI(level) > log_max_level[LOG_REALM_SYSTEMD]))
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);
buffer = newa(char, n + 2 + LINE_MAX);
b = stpcpy(stpcpy(buffer, object), ": ");
} else
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;
}
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];
LogRealm realm = LOG_REALM_REMOVE_LEVEL(level);
if (_likely_(LOG_PRI(level) > log_max_level[realm]))
return;
DISABLE_WARNING_FORMAT_NONLITERAL;
(void) snprintf(buffer, sizeof buffer, format, text, file, line, func);
REENABLE_WARNING;
log_abort_msg = buffer;
log_dispatch_internal(level, 0, file, line, func, NULL, NULL, NULL, NULL, buffer);
}
_noreturn_ void log_assert_failed_realm(
LogRealm realm,
const char *text,
const char *file,
int line,
const char *func) {
log_open();
log_assert(LOG_REALM_PLUS_LEVEL(realm, LOG_CRIT), text, file, line, func,
"Assertion '%s' failed at %s:%u, function %s(). Aborting.");
abort();
}
_noreturn_ void log_assert_failed_unreachable_realm(
LogRealm realm,
const char *text,
const char *file,
int line,
const char *func) {
log_open();
log_assert(LOG_REALM_PLUS_LEVEL(realm, LOG_CRIT), text, file, line, func,
"Code should not be reached '%s' at %s:%u, function %s(). Aborting.");
abort();
}
void log_assert_failed_return_realm(
LogRealm realm,
const char *text,
const char *file,
int line,
const char *func) {
PROTECT_ERRNO;
log_assert(LOG_REALM_PLUS_LEVEL(realm, LOG_DEBUG), text, file, line, func,
"Assertion '%s' failed at %s:%u, function %s(). Ignoring.");
}
int log_oom_internal(LogRealm realm, const char *file, int line, const char *func) {
return log_internal_realm(LOG_REALM_PLUS_LEVEL(realm, LOG_ERR),
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) {
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[(*n)++] = IOVEC_MAKE_STRING(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, ...) {
LogRealm realm = LOG_REALM_REMOVE_LEVEL(level);
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[realm]))
return -error;
if (log_target == LOG_TARGET_NULL)
return -error;
if ((level & LOG_FACMASK) == 0)
level = log_facility | LOG_PRI(level);
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[17] = {};
size_t 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[n++] = IOVEC_MAKE_STRING(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) {
if (open_when_needed)
log_close();
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);
(void) 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) {
if (open_when_needed)
log_close();
return -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) {
LogRealm realm = LOG_REALM_REMOVE_LEVEL(level);
PROTECT_ERRNO;
size_t i;
char *m;
if (error < 0)
error = -error;
if (_likely_(LOG_PRI(level) > log_max_level[realm]))
return -error;
if (log_target == LOG_TARGET_NULL)
return -error;
if ((level & LOG_FACMASK) == 0)
level = log_facility | LOG_PRI(level);
if (IN_SET(log_target, LOG_TARGET_AUTO,
LOG_TARGET_JOURNAL_OR_KMSG,
LOG_TARGET_JOURNAL) &&
journal_fd >= 0) {
struct iovec iovec[1 + n_input_iovec*2];
char header[LINE_MAX];
struct msghdr mh = {
.msg_iov = iovec,
.msg_iovlen = 1 + n_input_iovec*2,
};
log_do_header(header, sizeof(header), level, error, file, line, func, NULL, NULL, NULL, NULL);
iovec[0] = IOVEC_MAKE_STRING(header);
for (i = 0; i < n_input_iovec; i++) {
iovec[1+i*2] = input_iovec[i];
iovec[1+i*2+1] = IOVEC_MAKE_STRING("\n");
}
if (sendmsg(journal_fd, &mh, MSG_NOSIGNAL) >= 0)
return -error;
}
for (i = 0; i < n_input_iovec; i++) {
if (input_iovec[i].iov_len < STRLEN("MESSAGE="))
continue;
if (memcmp(input_iovec[i].iov_base, "MESSAGE=", STRLEN("MESSAGE=")) == 0)
break;
}
if (_unlikely_(i >= n_input_iovec)) /* Couldn't find MESSAGE=? */
return -error;
m = strndupa(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);
}
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_realm(LogRealm realm, const char *e) {
int t;
t = log_level_from_string(e);
if (t < 0)
return -EINVAL;
log_set_max_level_realm(realm, 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 (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 '%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);
}
return 0;
}
void log_parse_environment_realm(LogRealm realm) {
/* Do not call from library code. */
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) proc_cmdline_parse(parse_proc_cmdline_item, NULL, PROC_CMDLINE_STRIP_RD_PREFIX);
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 && log_set_max_level_from_string_realm(realm, e) < 0)
log_warning("Failed to parse log level '%s'. Ignoring.", e);
e = getenv("SYSTEMD_LOG_COLOR");
if (e && log_show_color_from_string(e) < 0)
log_warning("Failed to parse bool '%s'. Ignoring.", e);
e = 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_realm(LogRealm realm) {
return log_max_level[realm];
}
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 (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 (pid_is_valid(si->ssi_pid)) {
_cleanup_free_ char *p = NULL;
(void) 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));
}
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];
va_list ap;
const char *unit_fmt = NULL;
if (error < 0)
error = -error;
if (_likely_(LOG_PRI(level) > log_max_level[LOG_REALM_SYSTEMD]))
return -error;
if (log_target == LOG_TARGET_NULL)
return -error;
if (error != 0)
errno = 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";
return log_struct_internal(
LOG_REALM_PLUS_LEVEL(LOG_REALM_SYSTEMD, level),
error,
file, line, func,
"MESSAGE_ID=" SD_MESSAGE_INVALID_CONFIGURATION_STR,
"CONFIG_FILE=%s", config_file,
"CONFIG_LINE=%u", config_line,
LOG_MESSAGE("%s:%u: %s", config_file, config_line, buffer),
unit_fmt, unit,
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) {
_cleanup_free_ char *p = NULL;
if (rvalue)
p = utf8_escape_invalid(rvalue);
log_syntax_internal(unit, level, config_file, config_line, 0, file, line, func,
"String is not UTF-8 clean, ignoring assignment: %s", strna(p));
return -EINVAL;
}
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;
}
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