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
|
/* pmlastmsg.c
* This is a parser module specifically for those horrible
* "<PRI>last message repeated n times" messages notoriously generated
* by some syslog implementations. Note that this parser should be placed
* on top of the parser stack -- it takes out only these messages and
* leaves all others for processing by the other parsers.
*
* NOTE: read comments in module-template.h to understand how this file
* works!
*
* File begun on 2010-07-13 by RGerhards
*
* Copyright 2014-2016 Rainer Gerhards and Adiscon GmbH.
*
* 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.lastline")
/* 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
/* parse a legay-formatted syslog message.
*/
BEGINparse
uchar *p2parse;
int lenMsg;
#define OpeningText "last message repeated "
#define ClosingText " times"
CODESTARTparse
dbgprintf("Message will now be parsed by \"last message repated n times\" 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 < sizeof(OpeningText)-1 + sizeof(ClosingText)-1 + 1) {
/* too short, can not be "our" message */
ABORT_FINALIZE(RS_RET_COULD_NOT_PARSE);
}
if(strncasecmp((char*) p2parse, OpeningText, sizeof(OpeningText)-1) != 0) {
/* wrong opening text */
ABORT_FINALIZE(RS_RET_COULD_NOT_PARSE);
}
lenMsg -= sizeof(OpeningText) - 1;
p2parse += sizeof(OpeningText) - 1;
/* now we need an integer --> digits */
while(lenMsg && isdigit(*p2parse)) {
--lenMsg;
++p2parse;
}
if(lenMsg != sizeof(ClosingText)-1) {
/* size must fit, else it is not "our" message... */
ABORT_FINALIZE(RS_RET_COULD_NOT_PARSE);
}
if(strncasecmp((char*) p2parse, ClosingText, lenMsg) != 0) {
/* wrong closing text */
ABORT_FINALIZE(RS_RET_COULD_NOT_PARSE);
}
/* OK, now we know we need to process this message, so we do that
* (and it is fairly simple in our case...)
*/
DBGPRINTF("pmlastmsg detected a \"last message repeated n times\" message\n");
setProtocolVersion(pMsg, MSG_LEGACY_PROTOCOL);
memcpy(&pMsg->tTIMESTAMP, &pMsg->tRcvdAt, sizeof(struct syslogTime));
MsgSetMSGoffs(pMsg, pMsg->offAfterPRI); /* we don't have a header! */
MsgSetTAG(pMsg, (uchar*)"", 0);
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("lastmsg 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:
*/
|
