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/* omstdout.c
* send all output to stdout - this is primarily a test driver (but may
* be used for weired use cases). Not tested for robustness!
*
* NOTE: read comments in module-template.h for more specifics!
*
* File begun on 2009-03-19 by RGerhards
*
* Copyright 2009-2012 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 "conf.h"
#include "syslogd-types.h"
#include "srUtils.h"
#include "template.h"
#include "module-template.h"
#include "errmsg.h"
#include "cfsysline.h"
MODULE_TYPE_OUTPUT
MODULE_TYPE_NOKEEP
MODULE_CNFNAME("omstdout")
static rsRetVal resetConfigVariables(uchar __attribute__((unused)) *pp, void __attribute__((unused)) *pVal);
/* internal structures
*/
DEF_OMOD_STATIC_DATA
/* config variables */
typedef struct _instanceData {
int bUseArrayInterface; /* uses action use array instead of string template interface? */
int bEnsureLFEnding; /* ensure that a linefeed is written at the end of EACH record (test aid for nettester) */
} instanceData;
typedef struct configSettings_s {
int bUseArrayInterface; /* shall action use array instead of string template interface? */
int bEnsureLFEnding; /* shall action use array instead of string template interface? */
} configSettings_t;
static configSettings_t cs;
BEGINinitConfVars /* (re)set config variables to default values */
CODESTARTinitConfVars
resetConfigVariables(NULL, NULL);
ENDinitConfVars
BEGINcreateInstance
CODESTARTcreateInstance
ENDcreateInstance
BEGINisCompatibleWithFeature
CODESTARTisCompatibleWithFeature
if(eFeat == sFEATURERepeatedMsgReduction)
iRet = RS_RET_OK;
ENDisCompatibleWithFeature
BEGINfreeInstance
CODESTARTfreeInstance
ENDfreeInstance
BEGINdbgPrintInstInfo
CODESTARTdbgPrintInstInfo
ENDdbgPrintInstInfo
BEGINtryResume
CODESTARTtryResume
ENDtryResume
BEGINdoAction
char **szParams;
char *toWrite;
int iParamVal;
int iParam;
int iBuf;
char szBuf[65564];
size_t len;
int r;
CODESTARTdoAction
if(pData->bUseArrayInterface) {
/* if we use array passing, we need to put together a string
* ourselves. At this point, please keep in mind that omstdout is
* primarily a testing aid. Other modules may do different processing
* if they would like to support downlevel versions which do not support
* array-passing, but also use that interface on cores who do...
* So this code here is also more or less an example of how to do that.
* rgerhards, 2009-04-03
*/
szParams = (char**)(void*) (ppString[0]);
/* In array-passing mode, ppString[] contains a NULL-terminated array
* of char *pointers.
*/
iParam = 0;
iBuf = 0;
while(szParams[iParam] != NULL) {
if(iParam > 0)
szBuf[iBuf++] = ','; /* all but first need a delimiter */
iParamVal = 0;
while(szParams[iParam][iParamVal] != '\0' && iBuf < (int) sizeof(szBuf)) {
szBuf[iBuf++] = szParams[iParam][iParamVal++];
}
++iParam;
}
szBuf[iBuf] = '\0';
toWrite = szBuf;
} else {
toWrite = (char*) ppString[0];
}
len = strlen(toWrite);
/* the following if's are just to silence compiler warnings. If someone
* actually intends to use this module in production (why???), this code
* needs to be more solid. -- rgerhards, 2012-11-28
*/
if((r = write(1, toWrite, len)) != (int) len) { /* 1 is stdout! */
DBGPRINTF("omstdout: error %d writing to stdout[%d]: %s\n",
r, len, toWrite);
}
if(pData->bEnsureLFEnding && toWrite[len-1] != '\n') {
if((r = write(1, "\n", 1)) != 1) { /* write missing LF */
DBGPRINTF("omstdout: error %d writing \\n to stdout\n",
r);
}
}
ENDdoAction
BEGINparseSelectorAct
int iTplOpts;
CODESTARTparseSelectorAct
CODE_STD_STRING_REQUESTparseSelectorAct(1)
/* first check if this config line is actually for us */
if(strncmp((char*) p, ":omstdout:", sizeof(":omstdout:") - 1)) {
ABORT_FINALIZE(RS_RET_CONFLINE_UNPROCESSED);
}
/* ok, if we reach this point, we have something for us */
p += sizeof(":omstdout:") - 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;
iTplOpts = (cs.bUseArrayInterface == 0) ? 0 : OMSR_TPL_AS_ARRAY;
CHKiRet(cflineParseTemplateName(&p, *ppOMSR, 0, iTplOpts, (uchar*) "RSYSLOG_FileFormat"));
pData->bUseArrayInterface = cs.bUseArrayInterface;
pData->bEnsureLFEnding = cs.bEnsureLFEnding;
CODE_STD_FINALIZERparseSelectorAct
ENDparseSelectorAct
BEGINmodExit
CODESTARTmodExit
ENDmodExit
BEGINqueryEtryPt
CODESTARTqueryEtryPt
CODEqueryEtryPt_STD_OMOD_QUERIES
CODEqueryEtryPt_STD_CONF2_CNFNAME_QUERIES
ENDqueryEtryPt
/* Reset config variables for this module to default values.
*/
static rsRetVal resetConfigVariables(uchar __attribute__((unused)) *pp, void __attribute__((unused)) *pVal)
{
DEFiRet;
cs.bUseArrayInterface = 0;
cs.bEnsureLFEnding = 1;
RETiRet;
}
BEGINmodInit()
rsRetVal localRet;
rsRetVal (*pomsrGetSupportedTplOpts)(unsigned long *pOpts);
unsigned long opts;
int bArrayPassingSupported; /* does core support template passing as an array? */
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 */
bArrayPassingSupported = 0;
localRet = pHostQueryEtryPt((uchar*)"OMSRgetSupportedTplOpts", &pomsrGetSupportedTplOpts);
if(localRet == RS_RET_OK) {
/* found entry point, so let's see if core supports array passing */
CHKiRet((*pomsrGetSupportedTplOpts)(&opts));
if(opts & OMSR_TPL_AS_ARRAY)
bArrayPassingSupported = 1;
} else if(localRet != RS_RET_ENTRY_POINT_NOT_FOUND) {
ABORT_FINALIZE(localRet); /* Something else went wrong, what is not acceptable */
}
DBGPRINTF("omstdout: array-passing is %ssupported by rsyslog core.\n", bArrayPassingSupported ? "" : "not ");
if(bArrayPassingSupported) {
/* enable config comand only if core supports it */
CHKiRet(omsdRegCFSLineHdlr((uchar *)"actionomstdoutarrayinterface", 0, eCmdHdlrBinary, NULL,
&cs.bUseArrayInterface, STD_LOADABLE_MODULE_ID));
}
CHKiRet(omsdRegCFSLineHdlr((uchar *)"actionomstdoutensurelfending", 0, eCmdHdlrBinary, NULL,
&cs.bEnsureLFEnding, STD_LOADABLE_MODULE_ID));
CHKiRet(omsdRegCFSLineHdlr((uchar *)"resetconfigvariables", 1, eCmdHdlrCustomHandler,
resetConfigVariables, NULL, STD_LOADABLE_MODULE_ID));
ENDmodInit
/* vi:set ai:
*/
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