plugins/pmnull/pmnull.c - main - githubmirror/rsyslog

plugins/pmnull/pmnull.c
175 строк5 KB
Rainer Gerhards
hardning: harden config parameter ownership and OOM cleanup
09 май 2026, 12:50
09 май 2026, 12:50e1e3d1b
/* pmnull.c
 * This is a parser module for CISCO IOS "syslog" format.
 *
 * File begun on 2014-07-07 by RGerhards
 *
 * Copyright 2014-2015 Rainer Gerhards and 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 <stdlib.h>
#include <string.h>
#include <assert.h>
#include <errno.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;
PARSER_NAME("rsyslog.pmnull")
MODULE_CNFNAME("pmnull")

/* internal structures */
DEF_PMOD_STATIC_DATA;
DEFobjCurrIf(glbl) DEFobjCurrIf(parser) DEFobjCurrIf(datetime)


    /* parser instance parameters */
    static struct cnfparamdescr parserpdescr[] = {
        {"tag", eCmdHdlrString, 0}, {"syslogfacility", eCmdHdlrFacility, 0}, {"syslogseverity", eCmdHdlrSeverity, 0}};
static struct cnfparamblk parserpblk = {CNFPARAMBLK_VERSION, sizeof(parserpdescr) / sizeof(struct cnfparamdescr),
                                        parserpdescr};

struct instanceConf_s {
    const char *tag;
    size_t lenTag;
    int pri;
};

BEGINisCompatibleWithFeature
    CODESTARTisCompatibleWithFeature;
    if (eFeat == sFEATUREAutomaticSanitazion) iRet = RS_RET_OK;
    if (eFeat == sFEATUREAutomaticPRIParsing) iRet = RS_RET_OK;
ENDisCompatibleWithFeature


/* create input instance, set default parameters, and
 * add it to the list of instances.
 */
static rsRetVal createInstance(instanceConf_t **pinst) {
    instanceConf_t *inst;
    DEFiRet;
    CHKmalloc(inst = malloc(sizeof(instanceConf_t)));
    inst->tag = NULL;
    *pinst = inst;
finalize_it:
    RETiRet;
}


BEGINfreeParserInst
    CODESTARTfreeParserInst;
    dbgprintf("pmnull: free parser instance %p\n", pInst);
ENDfreeParserInst

BEGINcheckParserInst
    CODESTARTcheckParserInst;
ENDcheckParserInst


BEGINnewParserInst
    struct cnfparamvals *pvals = NULL;
    int i;
    int syslogfacility = 1; /* default as of rfc3164 */
    int syslogseverity = 5; /* default as of rfc3164 */
    CODESTARTnewParserInst;
    DBGPRINTF("newParserInst (pmnull)\n");

    inst = NULL;
    CHKiRet(createInstance(&inst));

    if (lst == NULL) FINALIZE; /* just set defaults, no param block! */

    if ((pvals = nvlstGetParams(lst, &parserpblk, NULL)) == NULL) {
        ABORT_FINALIZE(RS_RET_MISSING_CNFPARAMS);
    }

    if (Debug) {
        dbgprintf("parser param blk in pmnull:\n");
        cnfparamsPrint(&parserpblk, pvals);
    }

    for (i = 0; i < parserpblk.nParams; ++i) {
        if (!pvals[i].bUsed) continue;
        if (!strcmp(parserpblk.descr[i].name, "tag")) {
            CHKmalloc(inst->tag = (const char *)es_str2cstr(pvals[i].val.d.estr, NULL));
            inst->lenTag = strlen(inst->tag);
        } else if (!strcmp(parserpblk.descr[i].name, "syslogfacility")) {
            syslogfacility = pvals[i].val.d.n;
        } else if (!strcmp(parserpblk.descr[i].name, "syslogseverity")) {
            syslogseverity = pvals[i].val.d.n;
        } else {
            dbgprintf(
                "pmnull: program error, non-handled "
                "param '%s'\n",
                parserpblk.descr[i].name);
        }
    }
    inst->pri = syslogfacility * 8 + syslogseverity;
finalize_it:
    CODE_STD_FINALIZERnewParserInst if (lst != NULL) cnfparamvalsDestruct(pvals, &parserpblk);
    if (iRet != RS_RET_OK) freeParserInst(inst);
ENDnewParserInst


BEGINparse2
    CODESTARTparse2;
    DBGPRINTF("Message will now be parsed by pmnull\n");
    if (pInst->tag != NULL) {
        MsgSetTAG(pMsg, (uchar *)pInst->tag, pInst->lenTag);
    }
    msgSetPRI(pMsg, pInst->pri);
    MsgSetMSGoffs(pMsg, 0);
ENDparse2


BEGINmodExit
    CODESTARTmodExit;
    /* release what we no longer need */
    objRelease(glbl, CORE_COMPONENT);
    objRelease(parser, CORE_COMPONENT);
    objRelease(datetime, CORE_COMPONENT);
ENDmodExit


BEGINqueryEtryPt
    CODESTARTqueryEtryPt;
    CODEqueryEtryPt_STD_PMOD2_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(parser, CORE_COMPONENT));
    CHKiRet(objUse(datetime, CORE_COMPONENT));

    DBGPRINTF("pmnull parser init called\n");
ENDmodInit