/* pmaixforwardedfrom.c * * this cleans up messages forwarded from AIX * * 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 MODULE_TYPE_NOKEEP MODULE_CNFNAME("pmaixforwardedfrom") 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: */