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/* pmaixforwardedfrom.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.
*
* 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
PARSER_NAME("rsyslog.aixforwardedfrom")
/* 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
BEGINparse
uchar *p2parse;
uchar *opening;
int lenMsg;
#define OpeningText "Message forwarded from "
CODESTARTparse
dbgprintf("Message will now be parsed by fix AIX Forwarded From 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("pmaixforwardedfrom: msg to look at: [%d]'%s'\n", lenMsg, p2parse);
if((unsigned) lenMsg < 42) {
/* too short, can not be "our" message */
/* minimum message, 16 character timestamp, 'Message forwarded from ", 1 character name, ': '*/
dbgprintf("msg too short!\n");
ABORT_FINALIZE(RS_RET_COULD_NOT_PARSE);
}
/* skip over timestamp */
lenMsg -=16;
p2parse +=16;
/* if there is the string "Message forwarded from " were the hostname should be */
if(strncasecmp((char*) p2parse, OpeningText, sizeof(OpeningText)-1) != 0) {
/* wrong opening text */
dbgprintf("not a AIX message forwarded from mangled log!\n");
ABORT_FINALIZE(RS_RET_COULD_NOT_PARSE);
}
/* bump the message portion up by 23 characters to overwrite the "Message forwarded from " with the hostname */
lenMsg -=23;
memmove(p2parse, p2parse + 23, lenMsg);
*(p2parse + lenMsg) = '\n';
*(p2parse + lenMsg + 1) = '\0';
pMsg->iLenRawMsg -=23;
pMsg->iLenMSG -=23;
/* now look for the : after the hostname to walk past the hostname, also watch for a space in case this isn't really an AIX log, but has a similar preamble */
while(lenMsg && *p2parse != ' ' && *p2parse != ':') {
--lenMsg;
++p2parse;
}
if (lenMsg && *p2parse != ':') {
dbgprintf("not a AIX message forwarded from mangled log but similar enough that the preamble has been removed\n");
ABORT_FINALIZE(RS_RET_COULD_NOT_PARSE);
}
/* bump the message portion up by one character to overwrite the extra : */
lenMsg -=1;
memmove(p2parse, p2parse + 1, lenMsg);
*(p2parse + lenMsg) = '\n';
*(p2parse + lenMsg + 1) = '\0';
pMsg->iLenRawMsg -=1;
pMsg->iLenMSG -=1;
/* now, claim to abort so that something else can parse the now modified message */
DBGPRINTF("pmaixforwardedfrom: new mesage: [%d]'%s'\n", lenMsg, pMsg->pszRawMsg + pMsg->offAfterPRI);
ABORT_FINALIZE(RS_RET_COULD_NOT_PARSE);
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("aixforwardedfrom 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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