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/* sysvar.c - imlements rsyslog system variables
*
* At least for now, this class only has static functions and no
* instances.
*
* Module begun 2008-02-25 by Rainer Gerhards
*
* Copyright 2008 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 <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include "rsyslog.h"
#include "obj.h"
#include "stringbuf.h"
#include "sysvar.h"
#include "datetime.h"
/* static data */
DEFobjStaticHelpers
DEFobjCurrIf(var)
DEFobjCurrIf(datetime)
/* Standard-Constructor
*/
BEGINobjConstruct(sysvar) /* be sure to specify the object type also in END macro! */
ENDobjConstruct(sysvar)
/* ConstructionFinalizer
* rgerhards, 2008-01-09
*/
static rsRetVal
sysvarConstructFinalize(sysvar_t __attribute__((unused)) *pThis)
{
DEFiRet;
RETiRet;
}
/* destructor for the sysvar object */
BEGINobjDestruct(sysvar) /* be sure to specify the object type also in END and CODESTART macros! */
CODESTARTobjDestruct(sysvar)
ENDobjDestruct(sysvar)
/* This function returns the current date in different
* variants. It is used to construct the $NOW series of
* system properties. The returned buffer must be freed
* by the caller when no longer needed. If the function
* can not allocate memory, it returns a NULL pointer.
* Added 2007-07-10 rgerhards
* TODO: this was taken from msg.c and we should consolidate it with the code
* there. This is especially important when we increase the number of system
* variables (what we definitely want to do).
*/
typedef enum ENOWType { NOW_NOW, NOW_YEAR, NOW_MONTH, NOW_DAY, NOW_HOUR, NOW_MINUTE } eNOWType;
static rsRetVal
getNOW(eNOWType eNow, cstr_t **ppStr)
{
DEFiRet;
uchar szBuf[16];
struct syslogTime t;
datetime.getCurrTime(&t);
switch(eNow) {
case NOW_NOW:
snprintf((char*) szBuf, sizeof(szBuf)/sizeof(uchar), "%4.4d-%2.2d-%2.2d", t.year, t.month, t.day);
break;
case NOW_YEAR:
snprintf((char*) szBuf, sizeof(szBuf)/sizeof(uchar), "%4.4d", t.year);
break;
case NOW_MONTH:
snprintf((char*) szBuf, sizeof(szBuf)/sizeof(uchar), "%2.2d", t.month);
break;
case NOW_DAY:
snprintf((char*) szBuf, sizeof(szBuf)/sizeof(uchar), "%2.2d", t.day);
break;
case NOW_HOUR:
snprintf((char*) szBuf, sizeof(szBuf)/sizeof(uchar), "%2.2d", t.hour);
break;
case NOW_MINUTE:
snprintf((char*) szBuf, sizeof(szBuf)/sizeof(uchar), "%2.2d", t.minute);
break;
}
/* now create a string object out of it and hand that over to the var */
CHKiRet(rsCStrConstructFromszStr(ppStr, szBuf));
finalize_it:
RETiRet;
}
/* The function returns a system variable suitable for use with RainerScript. Most importantly, this means
* that the value is returned in a var_t object. The var_t is constructed inside this function and
* MUST be freed by the caller.
* rgerhards, 2008-02-25
*/
static rsRetVal
GetVar(cstr_t *pstrVarName, var_t **ppVar)
{
DEFiRet;
var_t *pVar;
cstr_t *pstrProp;
ASSERT(pstrVarName != NULL);
ASSERT(ppVar != NULL);
/* make sure we have a var_t instance */
CHKiRet(var.Construct(&pVar));
CHKiRet(var.ConstructFinalize(pVar));
/* now begin the actual variable evaluation */
if(!rsCStrSzStrCmp(pstrVarName, (uchar*)"now", sizeof("now") - 1)) {
CHKiRet(getNOW(NOW_NOW, &pstrProp));
} else if(!rsCStrSzStrCmp(pstrVarName, (uchar*)"year", sizeof("year") - 1)) {
CHKiRet(getNOW(NOW_YEAR, &pstrProp));
} else if(!rsCStrSzStrCmp(pstrVarName, (uchar*)"month", sizeof("month") - 1)) {
CHKiRet(getNOW(NOW_MONTH, &pstrProp));
} else if(!rsCStrSzStrCmp(pstrVarName, (uchar*)"day", sizeof("day") - 1)) {
CHKiRet(getNOW(NOW_DAY, &pstrProp));
} else if(!rsCStrSzStrCmp(pstrVarName, (uchar*)"hour", sizeof("hour") - 1)) {
CHKiRet(getNOW(NOW_HOUR, &pstrProp));
} else if(!rsCStrSzStrCmp(pstrVarName, (uchar*)"minute", sizeof("minute") - 1)) {
CHKiRet(getNOW(NOW_MINUTE, &pstrProp));
} else {
ABORT_FINALIZE(RS_RET_SYSVAR_NOT_FOUND);
}
/* now hand the string over to the var object */
CHKiRet(var.SetString(pVar, pstrProp));
/* finally store var */
*ppVar = pVar;
finalize_it:
RETiRet;
}
/* queryInterface function
* rgerhards, 2008-02-21
*/
BEGINobjQueryInterface(sysvar)
CODESTARTobjQueryInterface(sysvar)
if(pIf->ifVersion != sysvarCURR_IF_VERSION) { /* check for current version, increment on each change */
ABORT_FINALIZE(RS_RET_INTERFACE_NOT_SUPPORTED);
}
/* ok, we have the right interface, so let's fill it
* Please note that we may also do some backwards-compatibility
* work here (if we can support an older interface version - that,
* of course, also affects the "if" above).
*/
//xxxpIf->oID = "sysvar";//OBJsysvar;
pIf->Construct = sysvarConstruct;
pIf->ConstructFinalize = sysvarConstructFinalize;
pIf->Destruct = sysvarDestruct;
pIf->GetVar = GetVar;
finalize_it:
ENDobjQueryInterface(sysvar)
/* Initialize the sysvar class. Must be called as the very first method
* before anything else is called inside this class.
* rgerhards, 2008-02-19
*/
BEGINObjClassInit(sysvar, 1, OBJ_IS_CORE_MODULE) /* class, version */
/* request objects we use */
CHKiRet(objUse(var, CORE_COMPONENT));
CHKiRet(objUse(datetime, CORE_COMPONENT));
/* set our own handlers */
OBJSetMethodHandler(objMethod_CONSTRUCTION_FINALIZER, sysvarConstructFinalize);
ENDObjClassInit(sysvar)
/* vi:set ai:
*/
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