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/* klog for BSD, based on the FreeBSD syslogd implementation.
*
* This contains OS-specific functionality to read the BSD
* kernel log. For a general overview, see head comment in
* imklog.c.
*
* Copyright (C) 2008 by Rainer Gerhards for the modifications of
* the original FreeBSD sources.
*
* I would like to express my gratitude to those folks which
* layed an important foundation for rsyslog to build on.
*
* This file is part of rsyslog.
*
* Rsyslog 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 3 of the License, or
* (at your option) any later version.
*
* Rsyslog 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 Rsyslog. If not, see <http://www.gnu.org/licenses/>.
*
* A copy of the GPL can be found in the file "COPYING" in this distribution.
*
* This file is based on earlier work included in the FreeBSD sources. We
* integrated it into the rsyslog project. The copyright below applies, and
* I also reproduce the original license under which we aquired the code:
*
* Copyright (c) 1983, 1988, 1993, 1994
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* If you would like to use the code under the BSD license, you should
* aquire your own copy of BSD's syslogd, from which we have taken it. The
* code in this file is modified and may only be used under the terms of
* the GPLv3+ as specified above.
*/
/* open the kernel log -- rger */
static void openKLog(void)
{
if ((fklog = open(_PATH_KLOG, O_RDONLY, 0)) >= 0)
if (fcntl(fklog, F_SETFL, O_NONBLOCK) < 0)
fklog = -1;
if (fklog < 0)
dprintf("can't open %s (%d)\n", _PATH_KLOG, errno);
}
static int fklog = -1; /* /dev/klog */
/*
* Read /dev/klog while data are available, split into lines.
*/
static void
readklog(void)
{
char *p, *q, line[MAXLINE + 1];
int len, i;
len = 0;
for (;;) {
i = read(fklog, line + len, MAXLINE - 1 - len);
if (i > 0) {
line[i + len] = '\0';
} else {
if (i < 0 && errno != EINTR && errno != EAGAIN) {
logerror("klog");
fklog = -1;
}
break;
}
for (p = line; (q = strchr(p, '\n')) != NULL; p = q + 1) {
*q = '\0';
printsys(p);
}
len = strlen(p);
if (len >= MAXLINE - 1) {
printsys(p);
len = 0;
}
if (len > 0)
memmove(line, p, len + 1);
}
if (len > 0)
printsys(line);
}
/*
* Take a raw input line from /dev/klog, format similar to syslog().
*/
static void
printsys(char *msg)
{
char *p, *q;
long n;
int flags, isprintf, pri;
flags = ISKERNEL | SYNC_FILE | ADDDATE; /* fsync after write */
p = msg;
pri = DEFSPRI;
isprintf = 1;
if (*p == '<') {
errno = 0;
n = strtol(p + 1, &q, 10);
if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) {
p = q + 1;
pri = n;
isprintf = 0;
}
}
/*
* Kernel printf's and LOG_CONSOLE messages have been displayed
* on the console already.
*/
if (isprintf || (pri & LOG_FACMASK) == LOG_CONSOLE)
flags |= IGN_CONS;
if (pri &~ (LOG_FACMASK|LOG_PRIMASK))
pri = DEFSPRI;
logmsg(pri, p, LocalHostName, flags);
}
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