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/* 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 2010 Rainer Gerhards and Adiscon GmbH.
*
* 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.
*/
#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"
MODULE_TYPE_PARSER
MODULE_TYPE_NOKEEP
MODULE_CNFNAME("pmlastmsg")
PARSER_NAME("rsyslog.lastline")
/* internal structures
*/
DEF_PMOD_STATIC_DATA
DEFobjCurrIf(errmsg)
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;
}
dbgprintf("pmlastmsg: msg to look at: [%d]'%s'\n", lenMsg, p2parse);
if((unsigned) lenMsg < sizeof(OpeningText)-1 + sizeof(ClosingText)-1 + 1) {
/* too short, can not be "our" message */
dbgprintf("msg too short!\n");
ABORT_FINALIZE(RS_RET_COULD_NOT_PARSE);
}
if(strncasecmp((char*) p2parse, OpeningText, sizeof(OpeningText)-1) != 0) {
/* wrong opening text */
dbgprintf("wrong opening text!\n");
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 */
dbgprintf("strcasecmp: %d\n", strncasecmp((char*) p2parse, ClosingText, lenMsg));
dbgprintf("pmlastmsg: closing msg to look at: [%d]'%s', (%s)\n", lenMsg, p2parse, ClosingText);
dbgprintf("wrong closing text!\n");
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, 0);
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(errmsg, CORE_COMPONENT);
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(errmsg, 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(); /* cache value, is set only during rsyslogd option processing */
ENDmodInit
/* vim:set ai:
*/
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