886 lines
24 KiB
C
886 lines
24 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <stdarg.h>
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#include <stdio.h>
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#include <errno.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <stddef.h>
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#include <printf.h>
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#include "log.h"
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#include "util.h"
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#include "missing.h"
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#include "macro.h"
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#include "socket-util.h"
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#define SNDBUF_SIZE (8*1024*1024)
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static LogTarget log_target = LOG_TARGET_CONSOLE;
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static int log_max_level = LOG_INFO;
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static int log_facility = LOG_DAEMON;
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static int console_fd = STDERR_FILENO;
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static int syslog_fd = -1;
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static int kmsg_fd = -1;
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static int journal_fd = -1;
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static bool syslog_is_stream = false;
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static bool show_color = false;
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static bool show_location = false;
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/* Akin to glibc's __abort_msg; which is private and we hence cannot
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* use here. */
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static char *log_abort_msg = NULL;
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void log_close_console(void) {
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if (console_fd < 0)
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return;
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if (getpid() == 1) {
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if (console_fd >= 3)
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close_nointr_nofail(console_fd);
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console_fd = -1;
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}
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}
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static int log_open_console(void) {
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if (console_fd >= 0)
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return 0;
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if (getpid() == 1) {
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console_fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC);
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if (console_fd < 0)
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return console_fd;
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} else
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console_fd = STDERR_FILENO;
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return 0;
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}
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void log_close_kmsg(void) {
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if (kmsg_fd < 0)
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return;
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close_nointr_nofail(kmsg_fd);
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kmsg_fd = -1;
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}
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static int log_open_kmsg(void) {
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if (kmsg_fd >= 0)
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return 0;
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kmsg_fd = open("/dev/kmsg", O_WRONLY|O_NOCTTY|O_CLOEXEC);
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if (kmsg_fd < 0)
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return -errno;
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return 0;
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}
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void log_close_syslog(void) {
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if (syslog_fd < 0)
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return;
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close_nointr_nofail(syslog_fd);
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syslog_fd = -1;
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}
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static int create_log_socket(int type) {
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int fd;
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/* All output to the syslog/journal fds we do asynchronously,
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* and if the buffers are full we just drop the messages */
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fd = socket(AF_UNIX, type|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
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if (fd < 0)
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return -errno;
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fd_inc_sndbuf(fd, SNDBUF_SIZE);
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return fd;
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}
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static int log_open_syslog(void) {
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union sockaddr_union sa;
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int r;
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if (syslog_fd >= 0)
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return 0;
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zero(sa);
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sa.un.sun_family = AF_UNIX;
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strncpy(sa.un.sun_path, "/dev/log", sizeof(sa.un.sun_path));
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syslog_fd = create_log_socket(SOCK_DGRAM);
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if (syslog_fd < 0) {
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r = syslog_fd;
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goto fail;
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}
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if (connect(syslog_fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + strlen(sa.un.sun_path)) < 0) {
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close_nointr_nofail(syslog_fd);
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/* Some legacy syslog systems still use stream
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* sockets. They really shouldn't. But what can we
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* do... */
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syslog_fd = create_log_socket(SOCK_STREAM);
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if (syslog_fd < 0) {
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r = syslog_fd;
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goto fail;
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}
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if (connect(syslog_fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + strlen(sa.un.sun_path)) < 0) {
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r = -errno;
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goto fail;
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}
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syslog_is_stream = true;
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} else
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syslog_is_stream = false;
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return 0;
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fail:
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log_close_syslog();
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return r;
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}
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void log_close_journal(void) {
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if (journal_fd < 0)
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return;
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close_nointr_nofail(journal_fd);
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journal_fd = -1;
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}
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static int log_open_journal(void) {
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union sockaddr_union sa;
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int r;
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if (journal_fd >= 0)
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return 0;
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journal_fd = create_log_socket(SOCK_DGRAM);
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if (journal_fd < 0) {
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r = journal_fd;
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goto fail;
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}
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zero(sa);
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sa.un.sun_family = AF_UNIX;
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strncpy(sa.un.sun_path, "/run/systemd/journal/socket", sizeof(sa.un.sun_path));
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if (connect(journal_fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + strlen(sa.un.sun_path)) < 0) {
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r = -errno;
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goto fail;
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}
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return 0;
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fail:
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log_close_journal();
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return r;
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}
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int log_open(void) {
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int r;
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/* If we don't use the console we close it here, to not get
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* killed by SAK. If we don't use syslog we close it here so
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* that we are not confused by somebody deleting the socket in
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* the fs. If we don't use /dev/kmsg we still keep it open,
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* because there is no reason to close it. */
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if (log_target == LOG_TARGET_NULL) {
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log_close_journal();
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log_close_syslog();
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log_close_console();
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return 0;
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}
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if ((log_target != LOG_TARGET_AUTO && log_target != LOG_TARGET_SAFE) ||
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getpid() == 1 ||
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isatty(STDERR_FILENO) <= 0) {
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if (log_target == LOG_TARGET_AUTO ||
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log_target == LOG_TARGET_JOURNAL_OR_KMSG ||
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log_target == LOG_TARGET_JOURNAL) {
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r = log_open_journal();
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if (r >= 0) {
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log_close_syslog();
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log_close_console();
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return r;
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}
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}
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if (log_target == LOG_TARGET_SYSLOG_OR_KMSG ||
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log_target == LOG_TARGET_SYSLOG) {
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r = log_open_syslog();
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if (r >= 0) {
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log_close_journal();
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log_close_console();
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return r;
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}
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}
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if (log_target == LOG_TARGET_AUTO ||
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log_target == LOG_TARGET_SAFE ||
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log_target == LOG_TARGET_JOURNAL_OR_KMSG ||
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log_target == LOG_TARGET_SYSLOG_OR_KMSG ||
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log_target == LOG_TARGET_KMSG) {
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r = log_open_kmsg();
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if (r >= 0) {
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log_close_journal();
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log_close_syslog();
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log_close_console();
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return r;
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}
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}
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}
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log_close_journal();
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log_close_syslog();
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/* Get the real /dev/console if we are PID=1, hence reopen */
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log_close_console();
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return log_open_console();
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}
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void log_set_target(LogTarget target) {
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assert(target >= 0);
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assert(target < _LOG_TARGET_MAX);
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log_target = target;
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}
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void log_close(void) {
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log_close_journal();
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log_close_syslog();
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log_close_kmsg();
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log_close_console();
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}
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void log_forget_fds(void) {
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console_fd = kmsg_fd = syslog_fd = journal_fd = -1;
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}
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void log_set_max_level(int level) {
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assert((level & LOG_PRIMASK) == level);
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log_max_level = level;
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}
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void log_set_facility(int facility) {
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log_facility = facility;
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}
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static int write_to_console(
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int level,
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const char*file,
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int line,
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const char *func,
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const char *buffer) {
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char location[64];
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struct iovec iovec[5];
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unsigned n = 0;
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bool highlight;
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if (console_fd < 0)
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return 0;
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highlight = LOG_PRI(level) <= LOG_ERR && show_color;
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zero(iovec);
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if (show_location) {
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snprintf(location, sizeof(location), "(%s:%u) ", file, line);
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char_array_0(location);
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IOVEC_SET_STRING(iovec[n++], location);
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}
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if (highlight)
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IOVEC_SET_STRING(iovec[n++], ANSI_HIGHLIGHT_RED_ON);
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IOVEC_SET_STRING(iovec[n++], buffer);
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if (highlight)
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IOVEC_SET_STRING(iovec[n++], ANSI_HIGHLIGHT_OFF);
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IOVEC_SET_STRING(iovec[n++], "\n");
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if (writev(console_fd, iovec, n) < 0)
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return -errno;
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return 1;
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}
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static int write_to_syslog(
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int level,
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const char*file,
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int line,
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const char *func,
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const char *buffer) {
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char header_priority[16], header_time[64], header_pid[16];
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struct iovec iovec[5];
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struct msghdr msghdr;
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time_t t;
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struct tm *tm;
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if (syslog_fd < 0)
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return 0;
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snprintf(header_priority, sizeof(header_priority), "<%i>", level);
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char_array_0(header_priority);
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t = (time_t) (now(CLOCK_REALTIME) / USEC_PER_SEC);
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if (!(tm = localtime(&t)))
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return -EINVAL;
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if (strftime(header_time, sizeof(header_time), "%h %e %T ", tm) <= 0)
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return -EINVAL;
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snprintf(header_pid, sizeof(header_pid), "[%lu]: ", (unsigned long) getpid());
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char_array_0(header_pid);
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zero(iovec);
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IOVEC_SET_STRING(iovec[0], header_priority);
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IOVEC_SET_STRING(iovec[1], header_time);
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IOVEC_SET_STRING(iovec[2], program_invocation_short_name);
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IOVEC_SET_STRING(iovec[3], header_pid);
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IOVEC_SET_STRING(iovec[4], buffer);
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/* When using syslog via SOCK_STREAM separate the messages by NUL chars */
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if (syslog_is_stream)
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iovec[4].iov_len++;
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zero(msghdr);
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msghdr.msg_iov = iovec;
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msghdr.msg_iovlen = ELEMENTSOF(iovec);
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for (;;) {
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ssize_t n;
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n = sendmsg(syslog_fd, &msghdr, MSG_NOSIGNAL);
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if (n < 0)
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return -errno;
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if (!syslog_is_stream ||
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(size_t) n >= IOVEC_TOTAL_SIZE(iovec, ELEMENTSOF(iovec)))
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break;
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IOVEC_INCREMENT(iovec, ELEMENTSOF(iovec), n);
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}
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return 1;
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}
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static int write_to_kmsg(
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int level,
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const char*file,
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int line,
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const char *func,
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const char *buffer) {
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char header_priority[16], header_pid[16];
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struct iovec iovec[5];
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if (kmsg_fd < 0)
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return 0;
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snprintf(header_priority, sizeof(header_priority), "<%i>", level);
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char_array_0(header_priority);
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snprintf(header_pid, sizeof(header_pid), "[%lu]: ", (unsigned long) getpid());
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char_array_0(header_pid);
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zero(iovec);
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IOVEC_SET_STRING(iovec[0], header_priority);
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IOVEC_SET_STRING(iovec[1], program_invocation_short_name);
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IOVEC_SET_STRING(iovec[2], header_pid);
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IOVEC_SET_STRING(iovec[3], buffer);
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IOVEC_SET_STRING(iovec[4], "\n");
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if (writev(kmsg_fd, iovec, ELEMENTSOF(iovec)) < 0)
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return -errno;
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return 1;
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}
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static int write_to_journal(
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int level,
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const char*file,
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int line,
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const char *func,
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const char *buffer) {
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char header[LINE_MAX];
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struct iovec iovec[3];
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struct msghdr mh;
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if (journal_fd < 0)
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return 0;
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snprintf(header, sizeof(header),
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"PRIORITY=%i\n"
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"SYSLOG_FACILITY=%i\n"
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"CODE_FILE=%s\n"
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"CODE_LINE=%i\n"
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"CODE_FUNCTION=%s\n"
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"SYSLOG_IDENTIFIER=%s\n"
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"MESSAGE=",
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LOG_PRI(level),
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LOG_FAC(level),
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file,
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line,
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func,
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program_invocation_short_name);
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char_array_0(header);
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zero(iovec);
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IOVEC_SET_STRING(iovec[0], header);
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IOVEC_SET_STRING(iovec[1], buffer);
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IOVEC_SET_STRING(iovec[2], "\n");
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zero(mh);
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mh.msg_iov = iovec;
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mh.msg_iovlen = ELEMENTSOF(iovec);
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if (sendmsg(journal_fd, &mh, MSG_NOSIGNAL) < 0)
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return -errno;
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return 1;
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}
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static int log_dispatch(
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int level,
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const char*file,
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int line,
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const char *func,
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char *buffer) {
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int r = 0;
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if (log_target == LOG_TARGET_NULL)
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return 0;
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/* Patch in LOG_DAEMON facility if necessary */
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if ((level & LOG_FACMASK) == 0)
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level = log_facility | LOG_PRI(level);
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do {
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char *e;
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int k = 0;
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buffer += strspn(buffer, NEWLINE);
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if (buffer[0] == 0)
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break;
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if ((e = strpbrk(buffer, NEWLINE)))
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*(e++) = 0;
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if (log_target == LOG_TARGET_AUTO ||
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log_target == LOG_TARGET_JOURNAL_OR_KMSG ||
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log_target == LOG_TARGET_JOURNAL) {
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k = write_to_journal(level, file, line, func, buffer);
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if (k < 0) {
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if (k != -EAGAIN)
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log_close_journal();
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log_open_kmsg();
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} else if (k > 0)
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r++;
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}
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if (log_target == LOG_TARGET_SYSLOG_OR_KMSG ||
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log_target == LOG_TARGET_SYSLOG) {
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k = write_to_syslog(level, file, line, func, buffer);
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if (k < 0) {
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if (k != -EAGAIN)
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log_close_syslog();
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log_open_kmsg();
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} else if (k > 0)
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r++;
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}
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if (k <= 0 &&
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(log_target == LOG_TARGET_AUTO ||
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log_target == LOG_TARGET_SAFE ||
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log_target == LOG_TARGET_SYSLOG_OR_KMSG ||
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log_target == LOG_TARGET_JOURNAL_OR_KMSG ||
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log_target == LOG_TARGET_KMSG)) {
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k = write_to_kmsg(level, file, line, func, buffer);
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if (k < 0) {
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log_close_kmsg();
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log_open_console();
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} else if (k > 0)
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r++;
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}
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if (k <= 0) {
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k = write_to_console(level, file, line, func, buffer);
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if (k < 0)
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return k;
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}
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buffer = e;
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} while (buffer);
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return r;
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}
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int log_dump_internal(
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int level,
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const char*file,
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int line,
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const char *func,
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char *buffer) {
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|
|
|
int saved_errno, r;
|
|
|
|
/* This modifies the buffer... */
|
|
|
|
if (_likely_(LOG_PRI(level) > log_max_level))
|
|
return 0;
|
|
|
|
saved_errno = errno;
|
|
r = log_dispatch(level, file, line, func, buffer);
|
|
errno = saved_errno;
|
|
|
|
return r;
|
|
}
|
|
|
|
int log_metav(
|
|
int level,
|
|
const char*file,
|
|
int line,
|
|
const char *func,
|
|
const char *format,
|
|
va_list ap) {
|
|
|
|
char buffer[LINE_MAX];
|
|
int saved_errno, r;
|
|
|
|
if (_likely_(LOG_PRI(level) > log_max_level))
|
|
return 0;
|
|
|
|
saved_errno = errno;
|
|
vsnprintf(buffer, sizeof(buffer), format, ap);
|
|
char_array_0(buffer);
|
|
|
|
r = log_dispatch(level, file, line, func, buffer);
|
|
errno = saved_errno;
|
|
|
|
return r;
|
|
}
|
|
|
|
int log_meta(
|
|
int level,
|
|
const char*file,
|
|
int line,
|
|
const char *func,
|
|
const char *format, ...) {
|
|
|
|
int r;
|
|
va_list ap;
|
|
|
|
va_start(ap, format);
|
|
r = log_metav(level, file, line, func, format, ap);
|
|
va_end(ap);
|
|
|
|
return r;
|
|
}
|
|
|
|
#pragma GCC diagnostic push
|
|
#pragma GCC diagnostic ignored "-Wformat-nonliteral"
|
|
_noreturn_ static void log_assert(const char *text, const char *file, int line, const char *func, const char *format) {
|
|
static char buffer[LINE_MAX];
|
|
|
|
snprintf(buffer, sizeof(buffer), format, text, file, line, func);
|
|
|
|
char_array_0(buffer);
|
|
log_abort_msg = buffer;
|
|
|
|
log_dispatch(LOG_CRIT, file, line, func, buffer);
|
|
abort();
|
|
}
|
|
#pragma GCC diagnostic pop
|
|
|
|
_noreturn_ void log_assert_failed(const char *text, const char *file, int line, const char *func) {
|
|
log_assert(text, file, line, func, "Assertion '%s' failed at %s:%u, function %s(). Aborting.");
|
|
}
|
|
|
|
_noreturn_ void log_assert_failed_unreachable(const char *text, const char *file, int line, const char *func) {
|
|
log_assert(text, file, line, func, "Code should not be reached '%s' at %s:%u, function %s(). Aborting.");
|
|
}
|
|
|
|
int log_oom_internal(const char *file, int line, const char *func) {
|
|
log_meta(LOG_ERR, file, line, func, "Out of memory.");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
int log_struct_internal(
|
|
int level,
|
|
const char *file,
|
|
int line,
|
|
const char *func,
|
|
const char *format, ...) {
|
|
|
|
int saved_errno;
|
|
va_list ap;
|
|
int r;
|
|
|
|
if (_likely_(LOG_PRI(level) > log_max_level))
|
|
return 0;
|
|
|
|
if (log_target == LOG_TARGET_NULL)
|
|
return 0;
|
|
|
|
if ((level & LOG_FACMASK) == 0)
|
|
level = log_facility | LOG_PRI(level);
|
|
|
|
saved_errno = errno;
|
|
|
|
if ((log_target == LOG_TARGET_AUTO ||
|
|
log_target == LOG_TARGET_JOURNAL_OR_KMSG ||
|
|
log_target == LOG_TARGET_JOURNAL) &&
|
|
journal_fd >= 0) {
|
|
|
|
char header[LINE_MAX];
|
|
struct iovec iovec[17];
|
|
unsigned n = 0, i;
|
|
struct msghdr mh;
|
|
const char nl = '\n';
|
|
|
|
/* If the journal is available do structured logging */
|
|
|
|
snprintf(header, sizeof(header),
|
|
"PRIORITY=%i\n"
|
|
"SYSLOG_FACILITY=%i\n"
|
|
"CODE_FILE=%s\n"
|
|
"CODE_LINE=%i\n"
|
|
"CODE_FUNCTION=%s\n"
|
|
"SYSLOG_IDENTIFIER=%s\n",
|
|
LOG_PRI(level),
|
|
LOG_FAC(level),
|
|
file,
|
|
line,
|
|
func,
|
|
program_invocation_short_name);
|
|
char_array_0(header);
|
|
|
|
zero(iovec);
|
|
IOVEC_SET_STRING(iovec[n++], header);
|
|
|
|
va_start(ap, format);
|
|
while (format && n + 1 < ELEMENTSOF(iovec)) {
|
|
char *buf;
|
|
va_list aq;
|
|
|
|
/* We need to copy the va_list structure,
|
|
* since vasprintf() leaves it afterwards at
|
|
* an undefined location */
|
|
|
|
va_copy(aq, ap);
|
|
if (vasprintf(&buf, format, aq) < 0) {
|
|
va_end(aq);
|
|
r = -ENOMEM;
|
|
goto finish;
|
|
}
|
|
va_end(aq);
|
|
|
|
/* Now, jump enough ahead, so that we point to
|
|
* the next format string */
|
|
VA_FORMAT_ADVANCE(format, ap);
|
|
|
|
IOVEC_SET_STRING(iovec[n++], buf);
|
|
|
|
iovec[n].iov_base = (char*) &nl;
|
|
iovec[n].iov_len = 1;
|
|
n++;
|
|
|
|
format = va_arg(ap, char *);
|
|
}
|
|
|
|
zero(mh);
|
|
mh.msg_iov = iovec;
|
|
mh.msg_iovlen = n;
|
|
|
|
if (sendmsg(journal_fd, &mh, MSG_NOSIGNAL) < 0)
|
|
r = -errno;
|
|
else
|
|
r = 1;
|
|
|
|
finish:
|
|
va_end(ap);
|
|
for (i = 1; i < n; i += 2)
|
|
free(iovec[i].iov_base);
|
|
|
|
} else {
|
|
char buf[LINE_MAX];
|
|
bool found = false;
|
|
|
|
/* Fallback if journal logging is not available */
|
|
|
|
va_start(ap, format);
|
|
while (format) {
|
|
va_list aq;
|
|
|
|
va_copy(aq, ap);
|
|
vsnprintf(buf, sizeof(buf), format, aq);
|
|
va_end(aq);
|
|
char_array_0(buf);
|
|
|
|
if (startswith(buf, "MESSAGE=")) {
|
|
found = true;
|
|
break;
|
|
}
|
|
|
|
VA_FORMAT_ADVANCE(format, ap);
|
|
|
|
format = va_arg(ap, char *);
|
|
}
|
|
va_end(ap);
|
|
|
|
if (found)
|
|
r = log_dispatch(level, file, line, func, buf + 8);
|
|
else
|
|
r = -EINVAL;
|
|
}
|
|
|
|
errno = saved_errno;
|
|
return r;
|
|
}
|
|
|
|
int log_set_target_from_string(const char *e) {
|
|
LogTarget t;
|
|
|
|
t = log_target_from_string(e);
|
|
if (t < 0)
|
|
return -EINVAL;
|
|
|
|
log_set_target(t);
|
|
return 0;
|
|
}
|
|
|
|
int log_set_max_level_from_string(const char *e) {
|
|
int t;
|
|
|
|
t = log_level_from_string(e);
|
|
if (t < 0)
|
|
return t;
|
|
|
|
log_set_max_level(t);
|
|
return 0;
|
|
}
|
|
|
|
void log_parse_environment(void) {
|
|
const char *e;
|
|
|
|
e = secure_getenv("SYSTEMD_LOG_TARGET");
|
|
if (e && log_set_target_from_string(e) < 0)
|
|
log_warning("Failed to parse log target %s. Ignoring.", e);
|
|
|
|
e = secure_getenv("SYSTEMD_LOG_LEVEL");
|
|
if (e && log_set_max_level_from_string(e) < 0)
|
|
log_warning("Failed to parse log level %s. Ignoring.", e);
|
|
|
|
e = secure_getenv("SYSTEMD_LOG_COLOR");
|
|
if (e && log_show_color_from_string(e) < 0)
|
|
log_warning("Failed to parse bool %s. Ignoring.", e);
|
|
|
|
e = secure_getenv("SYSTEMD_LOG_LOCATION");
|
|
if (e && log_show_location_from_string(e) < 0)
|
|
log_warning("Failed to parse bool %s. Ignoring.", e);
|
|
}
|
|
|
|
LogTarget log_get_target(void) {
|
|
return log_target;
|
|
}
|
|
|
|
int log_get_max_level(void) {
|
|
return log_max_level;
|
|
}
|
|
|
|
void log_show_color(bool b) {
|
|
show_color = b;
|
|
}
|
|
|
|
void log_show_location(bool b) {
|
|
show_location = b;
|
|
}
|
|
|
|
int log_show_color_from_string(const char *e) {
|
|
int t;
|
|
|
|
t = parse_boolean(e);
|
|
if (t < 0)
|
|
return t;
|
|
|
|
log_show_color(t);
|
|
return 0;
|
|
}
|
|
|
|
int log_show_location_from_string(const char *e) {
|
|
int t;
|
|
|
|
t = parse_boolean(e);
|
|
if (t < 0)
|
|
return t;
|
|
|
|
log_show_location(t);
|
|
return 0;
|
|
}
|
|
|
|
bool log_on_console(void) {
|
|
if (log_target == LOG_TARGET_CONSOLE)
|
|
return true;
|
|
|
|
return syslog_fd < 0 && kmsg_fd < 0 && journal_fd < 0;
|
|
}
|
|
|
|
static const char *const log_target_table[] = {
|
|
[LOG_TARGET_CONSOLE] = "console",
|
|
[LOG_TARGET_KMSG] = "kmsg",
|
|
[LOG_TARGET_JOURNAL] = "journal",
|
|
[LOG_TARGET_JOURNAL_OR_KMSG] = "journal-or-kmsg",
|
|
[LOG_TARGET_SYSLOG] = "syslog",
|
|
[LOG_TARGET_SYSLOG_OR_KMSG] = "syslog-or-kmsg",
|
|
[LOG_TARGET_AUTO] = "auto",
|
|
[LOG_TARGET_SAFE] = "safe",
|
|
[LOG_TARGET_NULL] = "null"
|
|
};
|
|
|
|
DEFINE_STRING_TABLE_LOOKUP(log_target, LogTarget);
|