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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 (C) 2008 by Rainer Gerhards and Adiscon GmbH. * * This file is part of the rsyslog runtime library. * * The rsyslog runtime library is free software: you can redistribute it and/or modify * it under the terms of the GNU Lesser General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * The rsyslog runtime library 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 Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public License * along with the rsyslog runtime library. If not, see <http://www.gnu.org/licenses/>. * * A copy of the GPL can be found in the file "COPYING" in this distribution. * A copy of the LGPL can be found in the file "COPYING.LESSER" 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) DEFobjCurrIf(glbl) /* 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, NULL); 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 if(!rsCStrSzStrCmp(pstrVarName, (uchar*)"myhostname", sizeof("myhostname") - 1)) { CHKiRet(rsCStrConstructFromszStr(&pstrProp, glbl.GetLocalHostName())); } 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). */ 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 */


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