+++ /dev/null
-/*-*- Mode: C; c-basic-offset: 8 -*-*/
-
-/***
- This file is part of systemd.
-
- Copyright 2010 Lennart Poettering
-
- systemd is free software; you can redistribute it and/or modify it
- under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
- (at your option) any later version.
-
- systemd is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with systemd; If not, see <http://www.gnu.org/licenses/>.
-***/
-
-#include <stdarg.h>
-#include <stdio.h>
-#include <errno.h>
-#include <unistd.h>
-#include <fcntl.h>
-#include <sys/socket.h>
-#include <sys/un.h>
-
-#include "log.h"
-#include "util.h"
-#include "macro.h"
-
-#define SYSLOG_TIMEOUT_USEC (5*USEC_PER_SEC)
-#define LOG_BUFFER_MAX 1024
-
-static LogTarget log_target = LOG_TARGET_CONSOLE;
-static int log_max_level = LOG_DEBUG;
-
-static int console_fd = STDERR_FILENO;
-static int syslog_fd = -1;
-static int kmsg_fd = -1;
-
-/* Akin to glibc's __abort_msg; which is private and we hance cannot
- * use here. */
-static char *log_abort_msg = NULL;
-
-void log_close_console(void) {
-
- if (console_fd < 0)
- return;
-
- if (getpid() == 1 || console_fd != STDERR_FILENO) {
- close_nointr_nofail(console_fd);
- console_fd = -1;
- }
-}
-
-static int log_open_console(void) {
-
- if (console_fd >= 0)
- return 0;
-
- if (getpid() == 1) {
-
- if ((console_fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC)) < 0) {
- log_error("Failed to open /dev/console for logging: %s", strerror(-console_fd));
- return console_fd;
- }
-
- log_info("Succesfully opened /dev/console for logging.");
- } else
- console_fd = STDERR_FILENO;
-
- return 0;
-}
-
-void log_close_kmsg(void) {
-
- if (kmsg_fd < 0)
- return;
-
- close_nointr_nofail(kmsg_fd);
- kmsg_fd = -1;
-}
-
-static int log_open_kmsg(void) {
-
- if (kmsg_fd >= 0)
- return 0;
-
- if ((kmsg_fd = open("/dev/kmsg", O_WRONLY|O_NOCTTY|O_CLOEXEC)) < 0) {
- log_info("Failed to open /dev/kmsg for logging: %s", strerror(errno));
- return -errno;
- }
-
- log_info("Succesfully opened /dev/kmsg for logging.");
-
- return 0;
-}
-
-void log_close_syslog(void) {
-
- if (syslog_fd < 0)
- return;
-
- close_nointr_nofail(syslog_fd);
- syslog_fd = -1;
-}
-
-static int log_open_syslog(void) {
- union {
- struct sockaddr sa;
- struct sockaddr_un un;
- } sa;
- struct timeval tv;
- int r;
-
- if (syslog_fd >= 0)
- return 0;
-
- if ((syslog_fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0)) < 0) {
- r = -errno;
- goto fail;
- }
-
- /* Make sure we don't block for more than 5s when talking to
- * syslog */
- timeval_store(&tv, SYSLOG_TIMEOUT_USEC);
- if (setsockopt(syslog_fd, SOL_SOCKET, SO_SNDTIMEO, &tv, sizeof(tv)) < 0) {
- r = -errno;
- goto fail;
- }
-
- zero(sa);
- sa.un.sun_family = AF_UNIX;
- strncpy(sa.un.sun_path, "/dev/log", sizeof(sa.un.sun_path));
-
- if (connect(syslog_fd, &sa.sa, sizeof(sa)) < 0) {
- r = -errno;
- goto fail;
- }
-
- log_info("Succesfully opened syslog for logging.");
-
- return 0;
-
-fail:
- log_close_syslog();
- log_info("Failed to open syslog for logging: %s", strerror(-r));
- return r;
-}
-
-int log_open(void) {
- int r;
-
- /* If we don't use the console we close it here, to not get
- * killed by SAK. If we don't use syslog we close it here so
- * that we are not confused by somebody deleting the socket in
- * the fs. If we don't use /dev/kmsg we still keep it open,
- * because there is no reason to close it. */
-
- if (log_target == LOG_TARGET_SYSLOG_OR_KMSG ||
- log_target == LOG_TARGET_SYSLOG)
- if ((r = log_open_syslog()) >= 0) {
- log_close_console();
- return r;
- }
-
- if (log_target == LOG_TARGET_SYSLOG_OR_KMSG ||
- log_target == LOG_TARGET_KMSG)
- if ((r = log_open_kmsg()) >= 0) {
- log_close_syslog();
- log_close_console();
- return r;
- }
-
- log_close_syslog();
- return log_open_console();
-}
-
-void log_set_target(LogTarget target) {
- assert(target >= 0);
- assert(target < _LOG_TARGET_MAX);
-
- log_target = target;
-}
-
-void log_set_max_level(int level) {
- assert((level & LOG_PRIMASK) == level);
-
- log_max_level = level;
-}
-
-static int write_to_console(
- int level,
- const char*file,
- int line,
- const char *func,
- const char *buffer) {
-
- char location[64];
- struct iovec iovec[5];
- unsigned n = 0;
- bool highlight;
-
- if (console_fd < 0)
- return 0;
-
- snprintf(location, sizeof(location), "(%s:%u) ", file, line);
- char_array_0(location);
-
- highlight = LOG_PRI(level) <= LOG_ERR;
-
- zero(iovec);
- IOVEC_SET_STRING(iovec[n++], location);
- if (highlight)
- IOVEC_SET_STRING(iovec[n++], "\x1B[1;31m");
- IOVEC_SET_STRING(iovec[n++], buffer);
- if (highlight)
- IOVEC_SET_STRING(iovec[n++], "\x1B[0m");
- IOVEC_SET_STRING(iovec[n++], "\n");
-
- if (writev(console_fd, iovec, n) < 0)
- return -errno;
-
- return 1;
-}
-
-static int write_to_syslog(
- int level,
- const char*file,
- int line,
- const char *func,
- const char *buffer) {
-
- char header_priority[16], header_time[64], header_pid[16];
- struct iovec iovec[5];
- struct msghdr msghdr;
- time_t t;
- struct tm *tm;
-
- if (syslog_fd < 0)
- return 0;
-
- snprintf(header_priority, sizeof(header_priority), "<%i>", LOG_MAKEPRI(LOG_DAEMON, LOG_PRI(level)));
- char_array_0(header_priority);
-
- t = (time_t) (now(CLOCK_REALTIME) / USEC_PER_SEC);
- if (!(tm = localtime(&t)))
- return -EINVAL;
-
- if (strftime(header_time, sizeof(header_time), "%h %e %T ", tm) <= 0)
- return -EINVAL;
-
- snprintf(header_pid, sizeof(header_pid), "[%llu]: ", (unsigned long long) getpid());
- char_array_0(header_pid);
-
- zero(iovec);
- IOVEC_SET_STRING(iovec[0], header_priority);
- IOVEC_SET_STRING(iovec[1], header_time);
- IOVEC_SET_STRING(iovec[2], __progname);
- IOVEC_SET_STRING(iovec[3], header_pid);
- IOVEC_SET_STRING(iovec[4], buffer);
-
- zero(msghdr);
- msghdr.msg_iov = iovec;
- msghdr.msg_iovlen = ELEMENTSOF(iovec);
-
- if (sendmsg(syslog_fd, &msghdr, 0) < 0)
- return -errno;
-
- return 1;
-}
-
-static int write_to_kmsg(
- int level,
- const char*file,
- int line,
- const char *func,
- const char *buffer) {
-
- char header_priority[16], header_pid[16];
- struct iovec iovec[5];
-
- if (kmsg_fd < 0)
- return 0;
-
- snprintf(header_priority, sizeof(header_priority), "<%i>", LOG_PRI(level));
- char_array_0(header_priority);
-
- snprintf(header_pid, sizeof(header_pid), "[%llu]: ", (unsigned long long) getpid());
- char_array_0(header_pid);
-
- zero(iovec);
- IOVEC_SET_STRING(iovec[0], header_priority);
- IOVEC_SET_STRING(iovec[1], __progname);
- IOVEC_SET_STRING(iovec[2], header_pid);
- IOVEC_SET_STRING(iovec[3], buffer);
- IOVEC_SET_STRING(iovec[4], "\n");
-
- if (writev(kmsg_fd, iovec, ELEMENTSOF(iovec)) < 0)
- return -errno;
-
- return 1;
-}
-
-static int log_dispatch(
- int level,
- const char*file,
- int line,
- const char *func,
- const char *buffer) {
-
- int r;
-
- if (log_target == LOG_TARGET_SYSLOG_OR_KMSG ||
- log_target == LOG_TARGET_SYSLOG) {
-
- if ((r = write_to_syslog(level, file, line, func, buffer)) < 0) {
- log_close_syslog();
- log_open_kmsg();
- } else if (r > 0)
- return r;
- }
-
- if (log_target == LOG_TARGET_SYSLOG_OR_KMSG ||
- log_target == LOG_TARGET_KMSG) {
-
- if ((r = write_to_kmsg(level, file, line, func, buffer)) < 0) {
- log_close_kmsg();
- log_open_console();
- } else if (r > 0)
- return r;
- }
-
- return write_to_console(level, file, line, func, buffer);
-}
-
-int log_meta(
- int level,
- const char*file,
- int line,
- const char *func,
- const char *format, ...) {
-
- char buffer[LOG_BUFFER_MAX];
- int saved_errno, r;
- va_list ap;
-
- if (_likely(LOG_PRI(level) > log_max_level))
- return 0;
-
- saved_errno = errno;
-
- va_start(ap, format);
- vsnprintf(buffer, sizeof(buffer), format, ap);
- va_end(ap);
-
- char_array_0(buffer);
-
- r = log_dispatch(level, file, line, func, buffer);
- errno = saved_errno;
-
- return r;
-}
-
-void log_assert(
- const char*file,
- int line,
- const char *func,
- const char *format, ...) {
-
- static char buffer[LOG_BUFFER_MAX];
- int saved_errno = errno;
- va_list ap;
-
- va_start(ap, format);
- vsnprintf(buffer, sizeof(buffer), format, ap);
- va_end(ap);
-
- char_array_0(buffer);
- log_abort_msg = buffer;
-
- log_dispatch(LOG_CRIT, file, line, func, buffer);
- abort();
-
- /* If the user chose to ignore this SIGABRT, we are happy to go on, as if nothing happened. */
- errno = saved_errno;
-}
-
-int log_set_target_from_string(const char *e) {
- LogTarget t;
-
- if ((t = log_target_from_string(e)) < 0)
- return -EINVAL;
-
- log_set_target(t);
- return 0;
-}
-
-int log_set_max_level_from_string(const char *e) {
- int t;
-
- if ((t = log_level_from_string(e)) < 0)
- return -EINVAL;
-
- log_set_max_level(t);
- return 0;
-}
-
-void log_parse_environment(void) {
- const char *e;
-
- if ((e = getenv("SYSTEMD_LOG_TARGET")))
- if (log_set_target_from_string(e) < 0)
- log_warning("Failed to parse log target %s. Ignoring.", e);
-
- if ((e = getenv("SYSTEMD_LOG_LEVEL")))
- if (log_set_max_level_from_string(e) < 0)
- log_warning("Failed to parse log level %s. Ignoring.", e);
-}
-
-LogTarget log_get_target(void) {
- return log_target;
-}
-
-int log_get_max_level(void) {
- return log_max_level;
-}
-
-static const char *const log_target_table[] = {
- [LOG_TARGET_CONSOLE] = "console",
- [LOG_TARGET_SYSLOG] = "syslog",
- [LOG_TARGET_KMSG] = "kmsg",
- [LOG_TARGET_SYSLOG_OR_KMSG] = "syslog-or-kmsg",
-};
-
-DEFINE_STRING_TABLE_LOOKUP(log_target, LogTarget);
~ianmdlvl / elogind.git / blobdiff