1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright 2010 Lennart Poettering
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
27 #include <sys/socket.h>
34 #define SYSLOG_TIMEOUT_USEC (5*USEC_PER_SEC)
36 static LogTarget log_target = LOG_TARGET_CONSOLE;
37 static int log_max_level = LOG_INFO;
39 static int console_fd = STDERR_FILENO;
40 static int syslog_fd = -1;
41 static int kmsg_fd = -1;
43 static bool show_color = false;
44 static bool show_location = false;
46 /* Akin to glibc's __abort_msg; which is private and we hance cannot
48 static char *log_abort_msg = NULL;
50 void log_close_console(void) {
57 close_nointr_nofail(console_fd);
63 static int log_open_console(void) {
70 if ((console_fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC)) < 0) {
71 log_error("Failed to open /dev/console for logging: %s", strerror(-console_fd));
75 log_debug("Succesfully opened /dev/console for logging.");
77 console_fd = STDERR_FILENO;
82 void log_close_kmsg(void) {
87 close_nointr_nofail(kmsg_fd);
91 static int log_open_kmsg(void) {
96 if ((kmsg_fd = open("/dev/kmsg", O_WRONLY|O_NOCTTY|O_CLOEXEC)) < 0) {
97 log_info("Failed to open /dev/kmsg for logging: %s", strerror(errno));
101 log_debug("Succesfully opened /dev/kmsg for logging.");
106 void log_close_syslog(void) {
111 close_nointr_nofail(syslog_fd);
115 static int log_open_syslog(void) {
118 struct sockaddr_un un;
126 if ((syslog_fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0)) < 0) {
131 /* Make sure we don't block for more than 5s when talking to
133 timeval_store(&tv, SYSLOG_TIMEOUT_USEC);
134 if (setsockopt(syslog_fd, SOL_SOCKET, SO_SNDTIMEO, &tv, sizeof(tv)) < 0) {
140 sa.un.sun_family = AF_UNIX;
141 strncpy(sa.un.sun_path, "/dev/log", sizeof(sa.un.sun_path));
143 if (connect(syslog_fd, &sa.sa, sizeof(sa)) < 0) {
148 log_debug("Succesfully opened syslog for logging.");
154 log_info("Failed to open syslog for logging: %s", strerror(-r));
161 /* If we don't use the console we close it here, to not get
162 * killed by SAK. If we don't use syslog we close it here so
163 * that we are not confused by somebody deleting the socket in
164 * the fs. If we don't use /dev/kmsg we still keep it open,
165 * because there is no reason to close it. */
167 if (log_target == LOG_TARGET_NULL) {
173 if (log_target == LOG_TARGET_SYSLOG_OR_KMSG ||
174 log_target == LOG_TARGET_SYSLOG)
175 if ((r = log_open_syslog()) >= 0) {
180 if (log_target == LOG_TARGET_SYSLOG_OR_KMSG ||
181 log_target == LOG_TARGET_KMSG)
182 if ((r = log_open_kmsg()) >= 0) {
189 return log_open_console();
192 void log_set_target(LogTarget target) {
194 assert(target < _LOG_TARGET_MAX);
199 void log_set_max_level(int level) {
200 assert((level & LOG_PRIMASK) == level);
202 log_max_level = level;
205 static int write_to_console(
210 const char *buffer) {
213 struct iovec iovec[5];
220 snprintf(location, sizeof(location), "(%s:%u) ", file, line);
221 char_array_0(location);
223 highlight = LOG_PRI(level) <= LOG_ERR && show_color;
227 IOVEC_SET_STRING(iovec[n++], location);
229 IOVEC_SET_STRING(iovec[n++], ANSI_HIGHLIGHT_ON);
230 IOVEC_SET_STRING(iovec[n++], buffer);
232 IOVEC_SET_STRING(iovec[n++], ANSI_HIGHLIGHT_OFF);
233 IOVEC_SET_STRING(iovec[n++], "\n");
235 if (writev(console_fd, iovec, n) < 0)
241 static int write_to_syslog(
246 const char *buffer) {
248 char header_priority[16], header_time[64], header_pid[16];
249 struct iovec iovec[5];
250 struct msghdr msghdr;
252 struct cmsghdr cmsghdr;
253 uint8_t buf[CMSG_SPACE(sizeof(struct ucred))];
262 snprintf(header_priority, sizeof(header_priority), "<%i>", LOG_MAKEPRI(LOG_DAEMON, LOG_PRI(level)));
263 char_array_0(header_priority);
265 t = (time_t) (now(CLOCK_REALTIME) / USEC_PER_SEC);
266 if (!(tm = localtime(&t)))
269 if (strftime(header_time, sizeof(header_time), "%h %e %T ", tm) <= 0)
272 snprintf(header_pid, sizeof(header_pid), "[%lu]: ", (unsigned long) getpid());
273 char_array_0(header_pid);
276 IOVEC_SET_STRING(iovec[0], header_priority);
277 IOVEC_SET_STRING(iovec[1], header_time);
278 IOVEC_SET_STRING(iovec[2], program_invocation_short_name);
279 IOVEC_SET_STRING(iovec[3], header_pid);
280 IOVEC_SET_STRING(iovec[4], buffer);
283 control.cmsghdr.cmsg_level = SOL_SOCKET;
284 control.cmsghdr.cmsg_type = SCM_CREDENTIALS;
285 control.cmsghdr.cmsg_len = CMSG_LEN(sizeof(struct ucred));
287 ucred = (struct ucred*) CMSG_DATA(&control.cmsghdr);
288 ucred->pid = getpid();
289 ucred->uid = getuid();
290 ucred->gid = getgid();
293 msghdr.msg_iov = iovec;
294 msghdr.msg_iovlen = ELEMENTSOF(iovec);
295 msghdr.msg_control = &control;
296 msghdr.msg_controllen = control.cmsghdr.cmsg_len;
298 if (sendmsg(syslog_fd, &msghdr, MSG_NOSIGNAL) < 0)
304 static int write_to_kmsg(
309 const char *buffer) {
311 char header_priority[16], header_pid[16];
312 struct iovec iovec[5];
317 snprintf(header_priority, sizeof(header_priority), "<%i>", LOG_PRI(level));
318 char_array_0(header_priority);
320 snprintf(header_pid, sizeof(header_pid), "[%lu]: ", (unsigned long) getpid());
321 char_array_0(header_pid);
324 IOVEC_SET_STRING(iovec[0], header_priority);
325 IOVEC_SET_STRING(iovec[1], program_invocation_short_name);
326 IOVEC_SET_STRING(iovec[2], header_pid);
327 IOVEC_SET_STRING(iovec[3], buffer);
328 IOVEC_SET_STRING(iovec[4], "\n");
330 if (writev(kmsg_fd, iovec, ELEMENTSOF(iovec)) < 0)
336 static int log_dispatch(
345 if (log_target == LOG_TARGET_NULL)
352 buffer += strspn(buffer, NEWLINE);
357 if ((e = strpbrk(buffer, NEWLINE)))
360 if (log_target == LOG_TARGET_SYSLOG_OR_KMSG ||
361 log_target == LOG_TARGET_SYSLOG) {
363 if ((k = write_to_syslog(level, file, line, func, buffer)) < 0) {
371 (log_target == LOG_TARGET_SYSLOG_OR_KMSG ||
372 log_target == LOG_TARGET_KMSG)) {
374 if ((k = write_to_kmsg(level, file, line, func, buffer)) < 0) {
382 (k = write_to_console(level, file, line, func, buffer)) < 0)
391 int log_dump_internal(
400 /* This modifies the buffer... */
402 if (_likely_(LOG_PRI(level) > log_max_level))
406 r = log_dispatch(level, file, line, func, buffer);
417 const char *format, ...) {
419 char buffer[LINE_MAX];
423 if (_likely_(LOG_PRI(level) > log_max_level))
428 va_start(ap, format);
429 vsnprintf(buffer, sizeof(buffer), format, ap);
432 char_array_0(buffer);
434 r = log_dispatch(level, file, line, func, buffer);
444 const char *format, ...) {
446 static char buffer[LINE_MAX];
447 int saved_errno = errno;
450 va_start(ap, format);
451 vsnprintf(buffer, sizeof(buffer), format, ap);
454 char_array_0(buffer);
455 log_abort_msg = buffer;
457 log_dispatch(LOG_CRIT, file, line, func, buffer);
460 /* If the user chose to ignore this SIGABRT, we are happy to go on, as if nothing happened. */
464 int log_set_target_from_string(const char *e) {
467 if ((t = log_target_from_string(e)) < 0)
474 int log_set_max_level_from_string(const char *e) {
477 if ((t = log_level_from_string(e)) < 0)
480 log_set_max_level(t);
484 void log_parse_environment(void) {
487 if ((e = getenv("SYSTEMD_LOG_TARGET")))
488 if (log_set_target_from_string(e) < 0)
489 log_warning("Failed to parse log target %s. Ignoring.", e);
491 if ((e = getenv("SYSTEMD_LOG_LEVEL")))
492 if (log_set_max_level_from_string(e) < 0)
493 log_warning("Failed to parse log level %s. Ignoring.", e);
495 if ((e = getenv("SYSTEMD_LOG_COLOR")))
496 if (log_show_color_from_string(e) < 0)
497 log_warning("Failed to parse bool %s. Ignoring.", e);
499 if ((e = getenv("SYSTEMD_LOG_LOCATION"))) {
500 if (log_show_location_from_string(e) < 0)
501 log_warning("Failed to parse bool %s. Ignoring.", e);
505 LogTarget log_get_target(void) {
509 int log_get_max_level(void) {
510 return log_max_level;
513 void log_show_color(bool b) {
517 void log_show_location(bool b) {
521 int log_show_color_from_string(const char *e) {
524 if ((t = parse_boolean(e)) < 0)
531 int log_show_location_from_string(const char *e) {
534 if ((t = parse_boolean(e)) < 0)
537 log_show_location(t);
541 static const char *const log_target_table[] = {
542 [LOG_TARGET_CONSOLE] = "console",
543 [LOG_TARGET_SYSLOG] = "syslog",
544 [LOG_TARGET_KMSG] = "kmsg",
545 [LOG_TARGET_SYSLOG_OR_KMSG] = "syslog-or-kmsg",
546 [LOG_TARGET_NULL] = "null"
549 DEFINE_STRING_TABLE_LOOKUP(log_target, LogTarget);