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/* mmjsonparse.c
* This is a message modification module. If give, it extracts JSON data
* and populates the EE event structure with it.
*
* NOTE: read comments in module-template.h for details on the calling interface!
*
* File begun on 2012-02-20 by RGerhards
*
* Copyright 2012 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 <stdio.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <signal.h>
#include <errno.h>
#include <unistd.h>
#include <ctype.h>
#include <libestr.h>
#include <libee/libee.h>
#include "conf.h"
#include "syslogd-types.h"
#include "template.h"
#include "module-template.h"
#include "errmsg.h"
#include "cfsysline.h"
#include "dirty.h"
MODULE_TYPE_OUTPUT
MODULE_TYPE_NOKEEP
MODULE_CNFNAME("mmjsonparse")
static rsRetVal resetConfigVariables(uchar __attribute__((unused)) *pp, void __attribute__((unused)) *pVal);
/* static data */
DEFobjCurrIf(errmsg);
/* internal structures
*/
DEF_OMOD_STATIC_DATA
typedef struct _instanceData {
ee_ctx ctxee; /**< context to be used for libee */
} instanceData;
typedef struct configSettings_s {
int dummy; /* remove when the first real parameter is needed */
} configSettings_t;
static configSettings_t cs;
BEGINinitConfVars /* (re)set config variables to default values */
CODESTARTinitConfVars
resetConfigVariables(NULL, NULL);
ENDinitConfVars
BEGINcreateInstance
CODESTARTcreateInstance
ENDcreateInstance
BEGINisCompatibleWithFeature
CODESTARTisCompatibleWithFeature
ENDisCompatibleWithFeature
BEGINfreeInstance
CODESTARTfreeInstance
ee_exitCtx(pData->ctxee);
ENDfreeInstance
BEGINdbgPrintInstInfo
CODESTARTdbgPrintInstInfo
dbgprintf("mmjsonparse\n");
ENDdbgPrintInstInfo
BEGINtryResume
CODESTARTtryResume
ENDtryResume
#define COOKIE "@JSON: "
#define LEN_COOKIE (sizeof(COOKIE)-1)
BEGINdoAction
msg_t *pMsg;
uchar *buf;
struct ee_event *event;
CODESTARTdoAction
pMsg = (msg_t*) ppString[0];
/* note that we can performance-optimize the interface, but this also
* requires changes to the libraries. For now, we accept message
* duplication. -- rgerhards, 2010-12-01
*/
buf = getMSG(pMsg);
dbgprintf("mmjsonparse: msg is '%s'\n", buf);
while(*buf && isspace(*buf)) {
++buf;
}
if(*buf == '\0' || strncmp((char*)buf, COOKIE, LEN_COOKIE)) {
DBGPRINTF("mmjsonparse: no JSON cookie: '%s'\n", buf);
FINALIZE;
}
buf += LEN_COOKIE;
dbgprintf("mmjsonparse: cookie found, rest of message: '%s'\n", buf);
event = ee_newEventFromJSON(pData->ctxee, (char*)buf);
if(event == NULL) {
DBGPRINTF("mmjsonparse: JSON parse error, assuming no "
"JSON-enhanced message: '%s'\n", buf);
FINALIZE;
}
/* TODO: in the long term, we need to think about merging & different
name spaces (probably best to add the newly-obtained event as a child to
the existing event...)
*/
if(pMsg->event != NULL) {
ee_deleteEvent(pMsg->event);
}
pMsg->event = event;
#if 1
/***DEBUG***/ // TODO: remove after initial testing - 2010-12-01
{
char *cstr;
es_str_t *str;
ee_fmtEventToJSON(pMsg->event, &str);
cstr = es_str2cstr(str, NULL);
dbgprintf("mmjsonparse generated: %s\n", cstr);
free(cstr);
es_deleteStr(str);
}
/***END DEBUG***/
#endif
finalize_it:
ENDdoAction
BEGINparseSelectorAct
CODESTARTparseSelectorAct
CODE_STD_STRING_REQUESTparseSelectorAct(1)
/* first check if this config line is actually for us */
if(strncmp((char*) p, ":mmjsonparse:", sizeof(":mmjsonparse:") - 1)) {
ABORT_FINALIZE(RS_RET_CONFLINE_UNPROCESSED);
}
/* ok, if we reach this point, we have something for us */
p += sizeof(":mmjsonparse:") - 1; /* eat indicator sequence (-1 because of '\0'!) */
CHKiRet(createInstance(&pData));
/* check if a non-standard template is to be applied */
if(*(p-1) == ';')
--p;
/* we call the function below because we need to call it via our interface definition. However,
* the format specified (if any) is always ignored.
*/
CHKiRet(cflineParseTemplateName(&p, *ppOMSR, 0, OMSR_TPL_AS_MSG, (uchar*) "RSYSLOG_FileFormat"));
/* finally build the instance */
if((pData->ctxee = ee_initCtx()) == NULL) {
errmsg.LogError(0, RS_RET_NO_RULESET, "error: could not initialize libee ctx, cannot "
"activate action");
ABORT_FINALIZE(RS_RET_ERR_LIBEE_INIT);
}
CODE_STD_FINALIZERparseSelectorAct
ENDparseSelectorAct
BEGINmodExit
CODESTARTmodExit
objRelease(errmsg, CORE_COMPONENT);
ENDmodExit
BEGINqueryEtryPt
CODESTARTqueryEtryPt
CODEqueryEtryPt_STD_OMOD_QUERIES
ENDqueryEtryPt
/* Reset config variables for this module to default values.
*/
static rsRetVal resetConfigVariables(uchar __attribute__((unused)) *pp, void __attribute__((unused)) *pVal)
{
DEFiRet;
RETiRet;
}
BEGINmodInit()
rsRetVal localRet;
rsRetVal (*pomsrGetSupportedTplOpts)(unsigned long *pOpts);
unsigned long opts;
int bMsgPassingSupported;
CODESTARTmodInit
INITLegCnfVars
*ipIFVersProvided = CURR_MOD_IF_VERSION;
/* we only support the current interface specification */
CODEmodInit_QueryRegCFSLineHdlr
/* check if the rsyslog core supports parameter passing code */
bMsgPassingSupported = 0;
localRet = pHostQueryEtryPt((uchar*)"OMSRgetSupportedTplOpts",
&pomsrGetSupportedTplOpts);
if(localRet == RS_RET_OK) {
/* found entry point, so let's see if core supports msg passing */
CHKiRet((*pomsrGetSupportedTplOpts)(&opts));
if(opts & OMSR_TPL_AS_MSG)
bMsgPassingSupported = 1;
} else if(localRet != RS_RET_ENTRY_POINT_NOT_FOUND) {
ABORT_FINALIZE(localRet); /* Something else went wrong, not acceptable */
}
if(!bMsgPassingSupported) {
DBGPRINTF("mmjsonparse: msg-passing is not supported by rsyslog core, "
"can not continue.\n");
ABORT_FINALIZE(RS_RET_NO_MSG_PASSING);
}
CHKiRet(objUse(errmsg, CORE_COMPONENT));
CHKiRet(omsdRegCFSLineHdlr((uchar *)"resetconfigvariables", 1, eCmdHdlrCustomHandler,
resetConfigVariables, NULL, STD_LOADABLE_MODULE_ID));
ENDmodInit
/* vi:set ai:
*/
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