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
|
/* pmcisconames.c
*
* this detects logs sent by Cisco devices that mangle their syslog output when you tell them to log by name
* by adding ' :' between the name and the %XXX-X-XXXXXXX: tag
*
* instead of actually parsing the message, this modifies the message and then falls through to allow a later
* parser to handle the now modified message
*
* created 2010-12-13 by David Lang based on pmlastmsg
*
* This file is part of rsyslog.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
* -or-
* see COPYING.ASL20 in the source distribution
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "config.h"
#include "rsyslog.h"
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <ctype.h>
#include "conf.h"
#include "syslogd-types.h"
#include "template.h"
#include "msg.h"
#include "module-template.h"
#include "glbl.h"
#include "errmsg.h"
#include "parser.h"
#include "datetime.h"
#include "unicode-helper.h"
#include "rsconf.h"
MODULE_TYPE_PARSER
MODULE_TYPE_NOKEEP
PARSER_NAME("rsyslog.cisconames")
/* internal structures
*/
DEF_PMOD_STATIC_DATA
DEFobjCurrIf(glbl)
DEFobjCurrIf(parser)
DEFobjCurrIf(datetime)
/* static data */
static int bParseHOSTNAMEandTAG; /* cache for the equally-named global param - performance enhancement */
BEGINisCompatibleWithFeature
CODESTARTisCompatibleWithFeature
if(eFeat == sFEATUREAutomaticSanitazion)
iRet = RS_RET_OK;
if(eFeat == sFEATUREAutomaticPRIParsing)
iRet = RS_RET_OK;
ENDisCompatibleWithFeature
BEGINparse
uchar *p2parse;
int lenMsg;
#define OpeningText ": %"
CODESTARTparse
dbgprintf("Message will now be parsed by fix Cisco Names parser.\n");
assert(pMsg != NULL);
assert(pMsg->pszRawMsg != NULL);
lenMsg = pMsg->iLenRawMsg - pMsg->offAfterPRI;
/* note: offAfterPRI is already the number of PRI chars (do not add one!) */
p2parse = pMsg->pszRawMsg + pMsg->offAfterPRI; /* point to start of text, after PRI */
/* check if this message is of the type we handle in this (very limited) parser */
/* first, we permit SP */
while(lenMsg && *p2parse == ' ') {
--lenMsg;
++p2parse;
}
if((unsigned) lenMsg < 34) {
/* too short, can not be "our" message */
/* minimum message, 16 character timestamp, 1 character name, ' : %ASA-1-000000: '*/
ABORT_FINALIZE(RS_RET_COULD_NOT_PARSE);
}
/* check if the timestamp is a 16 character or 21 character timestamp
'Mmm DD HH:MM:SS ' spaces at 3,6,15 : at 9,12
'Mmm DD YYYY HH:MM:SS ' spaces at 3,6,11,20 : at 14,17
check for the : first as that will differentiate the two conditions the fastest
this allows the compiler to short circuit the rst of the tests if it is the wrong timestamp
but still check the rest to see if it looks correct
*/
if ( *(p2parse + 9) == ':' && *(p2parse + 12) == ':' && *(p2parse + 3) == ' ' && *(p2parse + 6) == ' '
&& *(p2parse + 15) == ' ') {
/* skip over timestamp */
dbgprintf("short timestamp found\n");
lenMsg -=16;
p2parse +=16;
} else {
if ( *(p2parse + 14) == ':' && *(p2parse + 17) == ':' && *(p2parse + 3) == ' '
&& *(p2parse + 6) == ' ' && *(p2parse + 11) == ' ' && *(p2parse + 20) == ' ') {
/* skip over timestamp */
dbgprintf("long timestamp found\n");
lenMsg -=21;
p2parse +=21;
} else {
dbgprintf("timestamp is not one of the valid formats\n");
ABORT_FINALIZE(RS_RET_COULD_NOT_PARSE);
}
}
/* now look for the next space to walk past the hostname */
while(lenMsg && *p2parse != ' ') {
--lenMsg;
++p2parse;
}
/* Note: we deliberately count the 0-byte below because we need to go chars+1! */
if(lenMsg < (int) sizeof(OpeningText)) {
dbgprintf("pmcisconames: too short for being cisco messages\n");
ABORT_FINALIZE(RS_RET_COULD_NOT_PARSE);
}
/* skip the space after the hostname */
lenMsg -=1;
p2parse +=1;
/* if the syslog tag is : and the next thing starts with a % assume that this is a mangled cisco
log and fix it */
if(strncasecmp((char*) p2parse, OpeningText, sizeof(OpeningText)-1) != 0) {
/* wrong opening text */
DBGPRINTF("not a cisco name mangled log!\n");
ABORT_FINALIZE(RS_RET_COULD_NOT_PARSE);
}
/* bump the message portion up by two characters to overwrite the extra : */
lenMsg -=2;
memmove(p2parse, p2parse + 2, lenMsg);
*(p2parse + lenMsg) = '\n';
*(p2parse + lenMsg + 1) = '\0';
pMsg->iLenRawMsg -=2;
pMsg->iLenMSG -=2;
/* now, claim to abort so that something else can parse the now modified message */
DBGPRINTF("pmcisconames: new message: [%d]'%s'\n", lenMsg, p2parse);
ABORT_FINALIZE(RS_RET_COULD_NOT_PARSE);
finalize_it:
ENDparse
BEGINmodExit
CODESTARTmodExit
/* release what we no longer need */
objRelease(glbl, CORE_COMPONENT);
objRelease(parser, CORE_COMPONENT);
objRelease(datetime, CORE_COMPONENT);
ENDmodExit
BEGINqueryEtryPt
CODESTARTqueryEtryPt
CODEqueryEtryPt_STD_PMOD_QUERIES
CODEqueryEtryPt_IsCompatibleWithFeature_IF_OMOD_QUERIES
ENDqueryEtryPt
BEGINmodInit()
CODESTARTmodInit
*ipIFVersProvided = CURR_MOD_IF_VERSION; /* we only support the current interface specification */
CODEmodInit_QueryRegCFSLineHdlr
CHKiRet(objUse(glbl, CORE_COMPONENT));
CHKiRet(objUse(parser, CORE_COMPONENT));
CHKiRet(objUse(datetime, CORE_COMPONENT));
DBGPRINTF("cisconames parser init called, compiled with version %s\n", VERSION);
bParseHOSTNAMEandTAG = glbl.GetParseHOSTNAMEandTAG(loadConf);
/* cache value, is set only during rsyslogd option processing */
ENDmodInit
/* vim:set ai:
*/
|
