1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
|
/* 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.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>
#include "rsyslog.h"
#include "imklog.h"
#include "debug.h"
/* globals */
static int fklog = -1; /* /dev/klog */
#ifndef _PATH_KLOG
# define _PATH_KLOG "/dev/klog"
#endif
static uchar *GetPath(void)
{
return pszPath ? pszPath : (uchar*) _PATH_KLOG;
}
/* open the kernel log - will be called inside the willRun() imklog
* entry point. -- rgerhards, 2008-04-09
*/
rsRetVal
klogWillRun(void)
{
DEFiRet;
fklog = open((char*)GetPath(), O_RDONLY, 0);
if (fklog < 0) {
dbgprintf("can't open %s (%d)\n", GetPath(), errno);
iRet = RS_RET_ERR; // TODO: better error code
}
RETiRet;
}
/* Read /dev/klog while data are available, split into lines.
* Contrary to standard BSD syslogd, we do a blocking read. We can
* afford this as imklog is running on its own threads. So if we have
* a single file, it really doesn't matter if we wait inside a 1-file
* select or the read() directly.
*/
static void
readklog(void)
{
char *p, *q;
int len, i;
int iMaxLine;
uchar bufRcv[4096+1];
uchar *pRcv = NULL; /* receive buffer */
iMaxLine = klog_getMaxLine();
/* we optimize performance: if iMaxLine is below 4K (which it is in almost all
* cases, we use a fixed buffer on the stack. Only if it is higher, heap memory
* is used. We could use alloca() to achive a similar aspect, but there are so
* many issues with alloca() that I do not want to take that route.
* rgerhards, 2008-09-02
*/
if((size_t) iMaxLine < sizeof(bufRcv) - 1) {
pRcv = bufRcv;
} else {
if((pRcv = (uchar*) MALLOC(sizeof(uchar) * (iMaxLine + 1))) == NULL)
iMaxLine = sizeof(bufRcv) - 1; /* better this than noting */
}
len = 0;
for (;;) {
dbgprintf("----------imklog(BSD) waiting for kernel log line\n");
i = read(fklog, pRcv + len, iMaxLine - len);
if (i > 0) {
pRcv[i + len] = '\0';
} else {
if (i < 0 && errno != EINTR && errno != EAGAIN) {
imklogLogIntMsg(LOG_ERR,
"imklog error %d reading kernel log - shutting down imklog",
errno);
fklog = -1;
}
break;
}
for (p = (char*)pRcv; (q = strchr(p, '\n')) != NULL; p = q + 1) {
*q = '\0';
Syslog(LOG_INFO, (uchar*) p);
}
len = strlen(p);
if (len >= iMaxLine - 1) {
Syslog(LOG_INFO, (uchar*)p);
len = 0;
}
if (len > 0)
memmove(pRcv, p, len + 1);
}
if (len > 0)
Syslog(LOG_INFO, pRcv);
if(pRcv != NULL && (size_t) iMaxLine >= sizeof(bufRcv) - 1)
free(pRcv);
}
/* to be called in the module's AfterRun entry point
* rgerhards, 2008-04-09
*/
rsRetVal klogAfterRun(void)
{
DEFiRet;
if(fklog != -1)
close(fklog);
RETiRet;
}
/* to be called in the module's WillRun entry point, this is the main
* "message pull" mechanism.
* rgerhards, 2008-04-09
*/
rsRetVal klogLogKMsg(void)
{
DEFiRet;
readklog();
RETiRet;
}
/* provide the (system-specific) default facility for internal messages
* rgerhards, 2008-04-14
*/
int
klogFacilIntMsg(void)
{
return LOG_SYSLOG;
}
|
