/* modules.c
 * This is the implementation of syslogd modules object.
 * This object handles plug-ins and build-in modules of all kind.
 *
 * Modules are reference-counted. Anyone who access a module must call
 * Use() before any function is accessed and Release() when he is done.
 * When the reference count reaches 0, rsyslog unloads the module (that
 * may be changed in the future to cache modules). Rsyslog does NOT
 * unload modules with a reference count > 0, even if the unload
 * method is called!
 *
 * File begun on 2007-07-22 by RGerhards
 *
 * Copyright 2007-2026 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 <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <assert.h>
#include <errno.h>
#include <pthread.h>
#ifdef OS_BSD
    #include "libgen.h"
#endif

#include <dlfcn.h> /* TODO: replace this with the libtools equivalent! */

#include <unistd.h>
#include <sys/file.h>

#include "rsyslog.h"
#include "rainerscript.h"
#include "cfsysline.h"
#include "rsconf.h"
#include "modules.h"
#include "errmsg.h"
#include "parser.h"
#include "strgen.h"

/* static data */
DEFobjStaticHelpers;
DEFobjCurrIf(strgen)

    static modInfo_t *pLoadedModules = NULL; /* list of currently-loaded modules */
static modInfo_t *pLoadedModulesLast = NULL; /* tail-pointer */

/* already dlopen()-ed libs */
static struct dlhandle_s *pHandles = NULL;

static uchar *pModDir; /* directory where loadable modules are found */

/* tables for interfacing with the v6 config system */
/* action (instance) parameters */
static struct cnfparamdescr actpdescr[] = {{"load", eCmdHdlrGetWord, 1}};
static struct cnfparamblk pblk = {CNFPARAMBLK_VERSION, sizeof(actpdescr) / sizeof(struct cnfparamdescr), actpdescr};


typedef rsRetVal (*pModInit_t)(int, int *, rsRetVal (**)(), rsRetVal (*)(), modInfo_t *);

/* we provide a set of dummy functions for modules that do not support the
 * some interfaces.
 * On the commit feature: As the modules do not support it, they commit each message they
 * receive, and as such the dummies can always return RS_RET_OK without causing
 * harm. This simplifies things as in action processing we do not need to check
 * if the transactional entry points exist.
 */
static rsRetVal dummyBeginTransaction(__attribute__((unused)) void *dummy) {
    return RS_RET_OK;
}
static rsRetVal dummyEndTransaction(__attribute__((unused)) void *dummy) {
    return RS_RET_OK;
}
static rsRetVal dummyIsCompatibleWithFeature(__attribute__((unused)) syslogFeature eFeat) {
    return RS_RET_INCOMPATIBLE;
}
static rsRetVal dummynewActInst(uchar *modName,
                                struct nvlst __attribute__((unused)) * dummy1,
                                void __attribute__((unused)) * *dummy2,
                                omodStringRequest_t __attribute__((unused)) * *dummy3) {
    LogError(0, RS_RET_CONFOBJ_UNSUPPORTED,
             "config objects are not "
             "supported by module '%s' -- legacy config options "
             "MUST be used instead",
             modName);
    return RS_RET_CONFOBJ_UNSUPPORTED;
}

#ifdef DEBUG
/* we add some home-grown support to track our users (and detect who does not free us). In
 * the long term, this should probably be migrated into debug.c (TODO). -- rgerhards, 2008-03-11
 */

/* add a user to the current list of users (always at the root) */
static void modUsrAdd(modInfo_t *pThis, const char *pszUsr) {
    modUsr_t *pUsr;

    if ((pUsr = calloc(1, sizeof(modUsr_t))) == NULL) goto finalize_it;

    if ((pUsr->pszFile = strdup(pszUsr)) == NULL) {
        free(pUsr);
        goto finalize_it;
    }

    if (pThis->pModUsrRoot != NULL) {
        pUsr->pNext = pThis->pModUsrRoot;
    }
    pThis->pModUsrRoot = pUsr;

finalize_it:
    return;
}


/* remove a user from the current user list
 * rgerhards, 2008-03-11
 */
static void modUsrDel(modInfo_t *pThis, const char *pszUsr) {
    modUsr_t *pUsr;
    modUsr_t *pPrev = NULL;

    for (pUsr = pThis->pModUsrRoot; pUsr != NULL; pUsr = pUsr->pNext) {
        if (!strcmp(pUsr->pszFile, pszUsr))
            break;
        else
            pPrev = pUsr;
    }

    if (pUsr == NULL) {
        dbgprintf("oops - tried to delete user %s from module %s and it wasn't registered as one...\n", pszUsr,
                  pThis->pszName);
    } else {
        if (pPrev == NULL) {
            /* This was at the root! */
            pThis->pModUsrRoot = pUsr->pNext;
        } else {
            pPrev->pNext = pUsr->pNext;
        }
        /* free resources */
        free(pUsr->pszFile);
        free(pUsr);
        pUsr = NULL; /* just to make sure... */
    }
}


/* print a short list all all source files using the module in question
 * rgerhards, 2008-03-11
 */
static void modUsrPrint(modInfo_t *pThis) {
    modUsr_t *pUsr;

    for (pUsr = pThis->pModUsrRoot; pUsr != NULL; pUsr = pUsr->pNext) {
        dbgprintf("\tmodule %s is currently in use by file %s\n", pThis->pszName, pUsr->pszFile);
    }
}


/* print all loaded modules and who is accessing them. This is primarily intended
 * to be called at end of run to detect "module leaks" and who is causing them.
 * rgerhards, 2008-03-11
 */
static void modUsrPrintAll(void) {
    modInfo_t *pMod;

    for (pMod = pLoadedModules; pMod != NULL; pMod = pMod->pNext) {
        dbgprintf("printing users of loadable module %s, refcount %u, ptr %p, type %d\n", pMod->pszName, pMod->uRefCnt,
                  pMod, pMod->eType);
        modUsrPrint(pMod);
    }
}

#endif /* #ifdef DEBUG */


/* Construct a new module object
 */
static rsRetVal moduleConstruct(modInfo_t **pThis) {
    modInfo_t *pNew;

    if ((pNew = calloc(1, sizeof(modInfo_t))) == NULL) return RS_RET_OUT_OF_MEMORY;

    /* OK, we got the element, now initialize members that should
     * not be zero-filled.
     */

    *pThis = pNew;
    return RS_RET_OK;
}


/* Destructs a module object. The object must not be linked to the
 * linked list of modules. Please note that all other dependencies on this
 * modules must have been removed before (e.g. CfSysLineHandlers!)
 */
static void moduleDestruct(modInfo_t *pThis) {
    assert(pThis != NULL);
    free(pThis->pszName);
    free(pThis->cnfName);
    if (pThis->pModHdlr != NULL) {
#ifdef VALGRIND
        DBGPRINTF(
            "moduleDestruct: compiled with valgrind, do "
            "not unload module\n");
#else
        if (glblUnloadModules) {
            if (pThis->eKeepType == eMOD_NOKEEP) {
                dlclose(pThis->pModHdlr);
            }
        } else {
            DBGPRINTF(
                "moduleDestruct: not unloading module "
                "due to user configuration\n");
        }
#endif
    }

    free(pThis);
}


/* This enables a module to query the core for specific features.
 * rgerhards, 2009-04-22
 */
static rsRetVal queryCoreFeatureSupport(int *pBool, unsigned uFeat) {
    DEFiRet;

    if (pBool == NULL) ABORT_FINALIZE(RS_RET_PARAM_ERROR);

    *pBool = (uFeat & CORE_FEATURE_BATCHING) ? 1 : 0;

finalize_it:
    RETiRet;
}


/* The following function is the queryEntryPoint for host-based entry points.
 * Modules may call it to get access to core interface functions. Please note
 * that utility functions can be accessed via shared libraries - at least this
 * is my current shool of thinking.
 * Please note that the implementation as a query interface allows one to take
 * care of plug-in interface version differences. -- rgerhards, 2007-07-31
 * ... but often it better not to use a new interface. So we now add core
 * functions here that a plugin may request. -- rgerhards, 2009-04-22
 */
static rsRetVal queryHostEtryPt(uchar *name, rsRetVal (**pEtryPoint)()) {
    DEFiRet;

    if ((name == NULL) || (pEtryPoint == NULL)) ABORT_FINALIZE(RS_RET_PARAM_ERROR);

    if (!strcmp((char *)name, "regCfSysLineHdlr")) {
        *pEtryPoint = regCfSysLineHdlr;
    } else if (!strcmp((char *)name, "objGetObjInterface")) {
        *pEtryPoint = objGetObjInterface;
    } else if (!strcmp((char *)name, "OMSRgetSupportedTplOpts")) {
        *pEtryPoint = OMSRgetSupportedTplOpts;
    } else if (!strcmp((char *)name, "queryCoreFeatureSupport")) {
        *pEtryPoint = queryCoreFeatureSupport;
    } else {
        *pEtryPoint = NULL; /* to  be on the safe side */
        ABORT_FINALIZE(RS_RET_ENTRY_POINT_NOT_FOUND);
    }

finalize_it:
    RETiRet;
}


/* get the name of a module
 */
uchar *modGetName(modInfo_t *pThis) {
    return ((pThis->pszName == NULL) ? (uchar *)"" : pThis->pszName);
}


/* get the state-name of a module. The state name is its name
 * together with a short description of the module state (which
 * is pulled from the module itself.
 * rgerhards, 2007-07-24
 * TODO: the actual state name is not yet pulled
 */
static uchar *modGetStateName(modInfo_t *pThis) {
    return (modGetName(pThis));
}


/* Add a module to the loaded module linked list
 */
static void ATTR_NONNULL() addModToGlblList(modInfo_t *const pThis) {
    assert(pThis != NULL);

    if (pLoadedModules == NULL) {
        pLoadedModules = pLoadedModulesLast = pThis;
    } else {
        /* there already exist entries */
        pThis->pPrev = pLoadedModulesLast;
        pLoadedModulesLast->pNext = pThis;
        pLoadedModulesLast = pThis;
    }
}


/* ready module for config processing. this includes checking if the module
 * is already in the config, so this function may return errors. Returns a
 * pointer to the last module inthe current config. That pointer needs to
 * be passed to addModToCnfLst() when it is called later in the process.
 */
rsRetVal readyModForCnf(modInfo_t *pThis, cfgmodules_etry_t **ppNew, cfgmodules_etry_t **ppLast) {
    cfgmodules_etry_t *pNew = NULL;
    cfgmodules_etry_t *pLast;
    DEFiRet;
    assert(pThis != NULL);

    if (loadConf == NULL) {
        FINALIZE; /* we are in an early init state */
    }

    /* check for duplicates and, as a side-activity, identify last node */
    pLast = loadConf->modules.root;
    if (pLast != NULL) {
        while (1) { /* loop broken inside */
            if (pLast->pMod == pThis) {
                DBGPRINTF("module '%s' already in this config\n", modGetName(pThis));
                if (strncmp((char *)modGetName(pThis), "builtin:", sizeof("builtin:") - 1)) {
                    LogError(0, RS_RET_MODULE_ALREADY_IN_CONF, "module '%s' already in this config, cannot be added\n",
                             modGetName(pThis));
                    ABORT_FINALIZE(RS_RET_MODULE_ALREADY_IN_CONF);
                }
                FINALIZE;
            }
            if (pLast->next == NULL) break;
            pLast = pLast->next;
        }
    }

    /* if we reach this point, pLast is the tail pointer and this module is new
     * inside the currently loaded config. So, iff it is an input module, let's
     * pass it a pointer which it can populate with a pointer to its module conf.
     */

    CHKmalloc(pNew = malloc(sizeof(cfgmodules_etry_t)));
    pNew->canActivate = 1;
    pNew->next = NULL;
    pNew->pMod = pThis;

    if (pThis->beginCnfLoad != NULL) {
        CHKiRet(pThis->beginCnfLoad(&pNew->modCnf, loadConf));
    }

    *ppLast = pLast;
    *ppNew = pNew;
finalize_it:
    if (iRet != RS_RET_OK) {
        if (pNew != NULL) free(pNew);
    }
    RETiRet;
}


/* abort the creation of a module entry without adding it to the
 * module list. Needed to prevent mem leaks.
 */
static inline void abortCnfUse(cfgmodules_etry_t **pNew) {
    if (pNew != NULL) {
        free(*pNew);
        *pNew = NULL;
    }
}


/* Add a module to the config module list for current loadConf.
 * Requires last pointer obtained by readyModForCnf().
 * The module pointer is handed over to this function. It is no
 * longer available to caller one we are called.
 */
rsRetVal ATTR_NONNULL(1) addModToCnfList(cfgmodules_etry_t **const pNew, cfgmodules_etry_t *const pLast) {
    DEFiRet;
    assert(*pNew != NULL);

    if (loadConf == NULL) {
        abortCnfUse(pNew);
        FINALIZE; /* we are in an early init state */
    }

    if (pLast == NULL) {
        loadConf->modules.root = *pNew;
    } else {
        /* there already exist entries */
        pLast->next = *pNew;
    }

finalize_it:
    *pNew = NULL;
    RETiRet;
}


/* Get the next module pointer - this is used to traverse the list.
 * The function returns the next pointer or NULL, if there is no next one.
 * The last object must be provided to the function. If NULL is provided,
 * it starts at the root of the list. Even in this case, NULL may be
 * returned - then, the list is empty.
 * rgerhards, 2007-07-23
 */
static modInfo_t *GetNxt(modInfo_t *pThis) {
    modInfo_t *pNew;

    if (pThis == NULL)
        pNew = pLoadedModules;
    else
        pNew = pThis->pNext;

    return (pNew);
}


/* this function is like GetNxt(), but it returns pointers to
 * the configmodules entry, which than can be used to obtain the
 * actual module pointer. Note that it returns those for
 * modules of specific type only. Only modules from the provided
 * config are returned. Note that processing speed could be improved,
 * but this is really not relevant, as config file loading is not really
 * something we are concerned about in regard to runtime.
 */
static cfgmodules_etry_t *GetNxtCnfType(rsconf_t *cnf, cfgmodules_etry_t *node, eModType_t rqtdType) {
    if (node == NULL) { /* start at beginning of module list */
        node = cnf->modules.root;
    } else {
        node = node->next;
    }

    if (rqtdType != eMOD_ANY) { /* if any, we already have the right one! */
        while (node != NULL && node->pMod->eType != rqtdType) {
            node = node->next;
        }
    }

    return node;
}


/* Find a module with the given conf name and type. Returns NULL if none
 * can be found, otherwise module found.
 */
static modInfo_t *FindWithCnfName(rsconf_t *cnf, uchar *name, eModType_t rqtdType) {
    cfgmodules_etry_t *node;

    ;
    for (node = cnf->modules.root; node != NULL; node = node->next) {
        if (node->pMod->eType != rqtdType || node->pMod->cnfName == NULL) continue;
        if (!strcasecmp((char *)node->pMod->cnfName, (char *)name)) break;
    }

    return node == NULL ? NULL : node->pMod;
}


/* Prepare a module for unloading.
 * This is currently a dummy, to be filled when we have a plug-in
 * interface - rgerhards, 2007-08-09
 * rgerhards, 2007-11-21:
 * When this function is called, all instance-data must already have
 * been destroyed. In the case of output modules, this happens when the
 * rule set is being destroyed. When we implement other module types, we
 * need to think how we handle it there (and if we have any instance data).
 * rgerhards, 2008-03-10: reject unload request if the module has a reference
 * count > 0.
 */
static rsRetVal modPrepareUnload(modInfo_t *pThis) {
    DEFiRet;
    void *pModCookie;

    assert(pThis != NULL);

    if (pThis->uRefCnt > 0) {
        dbgprintf("rejecting unload of module '%s' because it has a refcount of %d\n", pThis->pszName, pThis->uRefCnt);
        ABORT_FINALIZE(RS_RET_MODULE_STILL_REFERENCED);
    }

    CHKiRet(pThis->modGetID(&pModCookie));
    pThis->modExit(); /* tell the module to get ready for unload */
    CHKiRet(unregCfSysLineHdlrs4Owner(pModCookie));

finalize_it:
    RETiRet;
}


/* Add an already-loaded module to the module linked list. This function does
 * everything needed to fully initialize the module.
 */
static rsRetVal doModInit(pModInit_t modInit, uchar *name, void *pModHdlr, modInfo_t **pNewModule) {
    rsRetVal localRet;
    modInfo_t *pNew = NULL;
    uchar *pName;
    strgen_t *pStrgen; /* used for strgen modules */
    rsRetVal (*GetName)(uchar **);
    rsRetVal (*modGetType)(eModType_t *pType);
    rsRetVal (*modGetKeepType)(eModKeepType_t *pKeepType);
    struct dlhandle_s *pHandle = NULL;
    rsRetVal (*getModCnfName)(uchar **cnfName);
    uchar *cnfName;
    DEFiRet;

    assert(modInit != NULL);

    if ((iRet = moduleConstruct(&pNew)) != RS_RET_OK) {
        pNew = NULL;
        FINALIZE;
    }

    CHKiRet((*modInit)(CURR_MOD_IF_VERSION, &pNew->iIFVers, &pNew->modQueryEtryPt, queryHostEtryPt, pNew));

    if (pNew->iIFVers != CURR_MOD_IF_VERSION) {
        ABORT_FINALIZE(RS_RET_MISSING_INTERFACE);
    }

    /* We now poll the module to see what type it is. We do this only once as this
     * can never change in the lifetime of an module. -- rgerhards, 2007-12-14
     */
    CHKiRet((*pNew->modQueryEtryPt)((uchar *)"getType", &modGetType));
    CHKiRet((*modGetType)(&pNew->eType));
    CHKiRet((*pNew->modQueryEtryPt)((uchar *)"getKeepType", &modGetKeepType));
    CHKiRet((*modGetKeepType)(&pNew->eKeepType));
    dbgprintf("module %s of type %d being loaded (keepType=%d).\n", name, pNew->eType, pNew->eKeepType);

    /* OK, we know we can successfully work with the module. So we now fill the
     * rest of the data elements. First we load the interfaces common to all
     * module types.
     */
    CHKiRet((*pNew->modQueryEtryPt)((uchar *)"modGetID", &pNew->modGetID));
    CHKiRet((*pNew->modQueryEtryPt)((uchar *)"modExit", &pNew->modExit));
    localRet = (*pNew->modQueryEtryPt)((uchar *)"isCompatibleWithFeature", &pNew->isCompatibleWithFeature);
    if (localRet == RS_RET_MODULE_ENTRY_POINT_NOT_FOUND)
        pNew->isCompatibleWithFeature = dummyIsCompatibleWithFeature;
    else if (localRet != RS_RET_OK)
        ABORT_FINALIZE(localRet);
    localRet = (*pNew->modQueryEtryPt)((uchar *)"setModCnf", &pNew->setModCnf);
    if (localRet == RS_RET_MODULE_ENTRY_POINT_NOT_FOUND)
        pNew->setModCnf = NULL;
    else if (localRet != RS_RET_OK)
        ABORT_FINALIZE(localRet);

    /* optional calls for new config system */
    localRet = (*pNew->modQueryEtryPt)((uchar *)"getModCnfName", &getModCnfName);
    if (localRet == RS_RET_OK) {
        if (getModCnfName(&cnfName) == RS_RET_OK) pNew->cnfName = (uchar *)strdup((char *)cnfName);
        /**< we do not care if strdup() fails, we can accept that */
        else
            pNew->cnfName = NULL;
        dbgprintf("module config name is '%s'\n", cnfName);
    }
    localRet = (*pNew->modQueryEtryPt)((uchar *)"beginCnfLoad", &pNew->beginCnfLoad);
    if (localRet == RS_RET_OK) {
        dbgprintf("module %s supports rsyslog v6 config interface\n", name);
        CHKiRet((*pNew->modQueryEtryPt)((uchar *)"endCnfLoad", &pNew->endCnfLoad));
        CHKiRet((*pNew->modQueryEtryPt)((uchar *)"freeCnf", &pNew->freeCnf));
        CHKiRet((*pNew->modQueryEtryPt)((uchar *)"checkCnf", &pNew->checkCnf));
        CHKiRet((*pNew->modQueryEtryPt)((uchar *)"activateCnf", &pNew->activateCnf));
        localRet = (*pNew->modQueryEtryPt)((uchar *)"activateCnfPrePrivDrop", &pNew->activateCnfPrePrivDrop);
        if (localRet == RS_RET_MODULE_ENTRY_POINT_NOT_FOUND) {
            pNew->activateCnfPrePrivDrop = NULL;
        } else {
            CHKiRet(localRet);
        }
    } else if (localRet == RS_RET_MODULE_ENTRY_POINT_NOT_FOUND) {
        pNew->beginCnfLoad = NULL; /* flag as non-present */
    } else {
        ABORT_FINALIZE(localRet);
    }
    /* ... and now the module-specific interfaces */
    switch (pNew->eType) {
        case eMOD_IN:
            CHKiRet((*pNew->modQueryEtryPt)((uchar *)"runInput", &pNew->mod.im.runInput));
            CHKiRet((*pNew->modQueryEtryPt)((uchar *)"willRun", &pNew->mod.im.willRun));
            CHKiRet((*pNew->modQueryEtryPt)((uchar *)"afterRun", &pNew->mod.im.afterRun));
            pNew->mod.im.bCanRun = 0;
            localRet = (*pNew->modQueryEtryPt)((uchar *)"newInpInst", &pNew->mod.im.newInpInst);
            if (localRet == RS_RET_MODULE_ENTRY_POINT_NOT_FOUND) {
                pNew->mod.im.newInpInst = NULL;
            } else if (localRet != RS_RET_OK) {
                ABORT_FINALIZE(localRet);
            }
            localRet = (*pNew->modQueryEtryPt)((uchar *)"doHUP", &pNew->doHUP);
            if (localRet != RS_RET_OK && localRet != RS_RET_MODULE_ENTRY_POINT_NOT_FOUND) ABORT_FINALIZE(localRet);

            break;
        case eMOD_OUT:
            CHKiRet((*pNew->modQueryEtryPt)((uchar *)"freeInstance", &pNew->freeInstance));
            CHKiRet((*pNew->modQueryEtryPt)((uchar *)"dbgPrintInstInfo", &pNew->dbgPrintInstInfo));
            CHKiRet((*pNew->modQueryEtryPt)((uchar *)"parseSelectorAct", &pNew->mod.om.parseSelectorAct));
            CHKiRet((*pNew->modQueryEtryPt)((uchar *)"tryResume", &pNew->tryResume));
            CHKiRet((*pNew->modQueryEtryPt)((uchar *)"createWrkrInstance", &pNew->mod.om.createWrkrInstance));
            CHKiRet((*pNew->modQueryEtryPt)((uchar *)"freeWrkrInstance", &pNew->mod.om.freeWrkrInstance));

            /* try load optional interfaces */
            localRet = (*pNew->modQueryEtryPt)((uchar *)"doHUP", &pNew->doHUP);
            if (localRet != RS_RET_OK && localRet != RS_RET_MODULE_ENTRY_POINT_NOT_FOUND) ABORT_FINALIZE(localRet);

            localRet = (*pNew->modQueryEtryPt)((uchar *)"doHUPWrkr", &pNew->doHUPWrkr);
            if (localRet != RS_RET_OK && localRet != RS_RET_MODULE_ENTRY_POINT_NOT_FOUND) ABORT_FINALIZE(localRet);

            localRet = (*pNew->modQueryEtryPt)((uchar *)"SetShutdownImmdtPtr", &pNew->mod.om.SetShutdownImmdtPtr);
            if (localRet != RS_RET_OK && localRet != RS_RET_MODULE_ENTRY_POINT_NOT_FOUND) ABORT_FINALIZE(localRet);

            localRet = (*pNew->modQueryEtryPt)((uchar *)"setActionInfo", &pNew->mod.om.setActionInfo);
            if (localRet == RS_RET_MODULE_ENTRY_POINT_NOT_FOUND) {
                pNew->mod.om.setActionInfo = NULL;
            } else if (localRet != RS_RET_OK) {
                ABORT_FINALIZE(localRet);
            }

            pNew->mod.om.supportsTX = 1;
            localRet = (*pNew->modQueryEtryPt)((uchar *)"beginTransaction", &pNew->mod.om.beginTransaction);
            if (localRet == RS_RET_MODULE_ENTRY_POINT_NOT_FOUND) {
                pNew->mod.om.beginTransaction = dummyBeginTransaction;
                pNew->mod.om.supportsTX = 0;
            } else if (localRet != RS_RET_OK) {
                ABORT_FINALIZE(localRet);
            }

            localRet = (*pNew->modQueryEtryPt)((uchar *)"doAction", &pNew->mod.om.doAction);
            if (localRet == RS_RET_MODULE_ENTRY_POINT_NOT_FOUND) {
                pNew->mod.om.doAction = NULL;
            } else if (localRet != RS_RET_OK) {
                ABORT_FINALIZE(localRet);
            }

            localRet = (*pNew->modQueryEtryPt)((uchar *)"commitTransaction", &pNew->mod.om.commitTransaction);
            if (localRet == RS_RET_MODULE_ENTRY_POINT_NOT_FOUND) {
                pNew->mod.om.commitTransaction = NULL;
            } else if (localRet != RS_RET_OK) {
                ABORT_FINALIZE(localRet);
            }

            if (pNew->mod.om.doAction == NULL && pNew->mod.om.commitTransaction == NULL) {
                LogError(0, RS_RET_INVLD_OMOD,
                         "module %s does neither provide doAction() "
                         "nor commitTransaction() interface - cannot "
                         "load",
                         name);
                ABORT_FINALIZE(RS_RET_INVLD_OMOD);
            }

            if (pNew->mod.om.commitTransaction != NULL) {
                if (pNew->mod.om.doAction != NULL) {
                    LogError(0, RS_RET_INVLD_OMOD,
                             "module %s provides both doAction() "
                             "and commitTransaction() interface, using "
                             "commitTransaction()",
                             name);
                    pNew->mod.om.doAction = NULL;
                }
                if (pNew->mod.om.beginTransaction == NULL) {
                    LogError(0, RS_RET_INVLD_OMOD,
                             "module %s provides both commitTransaction() "
                             "but does not provide beginTransaction() - "
                             "cannot load",
                             name);
                    ABORT_FINALIZE(RS_RET_INVLD_OMOD);
                }
            }


            localRet = (*pNew->modQueryEtryPt)((uchar *)"endTransaction", &pNew->mod.om.endTransaction);
            if (localRet == RS_RET_MODULE_ENTRY_POINT_NOT_FOUND) {
                pNew->mod.om.endTransaction = dummyEndTransaction;
            } else if (localRet != RS_RET_OK) {
                ABORT_FINALIZE(localRet);
            }

            localRet = (*pNew->modQueryEtryPt)((uchar *)"newActInst", &pNew->mod.om.newActInst);
            if (localRet == RS_RET_MODULE_ENTRY_POINT_NOT_FOUND) {
                pNew->mod.om.newActInst = dummynewActInst;
            } else if (localRet != RS_RET_OK) {
                ABORT_FINALIZE(localRet);
            }
            break;
        case eMOD_LIB:
            break;
        case eMOD_PARSER:
            localRet = (*pNew->modQueryEtryPt)((uchar *)"parse2", &pNew->mod.pm.parse2);
            if (localRet == RS_RET_OK) {
                pNew->mod.pm.parse = NULL;
                CHKiRet((*pNew->modQueryEtryPt)((uchar *)"newParserInst", &pNew->mod.pm.newParserInst));
                localRet = (*pNew->modQueryEtryPt)((uchar *)"checkParserInst", &pNew->mod.pm.checkParserInst);
                if (localRet == RS_RET_MODULE_ENTRY_POINT_NOT_FOUND) {
                    pNew->mod.pm.checkParserInst = NULL;
                } else {
                    CHKiRet(localRet);
                }
                CHKiRet((*pNew->modQueryEtryPt)((uchar *)"freeParserInst", &pNew->mod.pm.freeParserInst));
            } else if (localRet == RS_RET_MODULE_ENTRY_POINT_NOT_FOUND) {
                pNew->mod.pm.parse2 = NULL;
                pNew->mod.pm.newParserInst = NULL;
                pNew->mod.pm.checkParserInst = NULL;
                pNew->mod.pm.freeParserInst = NULL;
                CHKiRet((*pNew->modQueryEtryPt)((uchar *)"parse", &pNew->mod.pm.parse));
            } else {
                ABORT_FINALIZE(localRet);
            }
            CHKiRet((*pNew->modQueryEtryPt)((uchar *)"GetParserName", &GetName));
            CHKiRet(GetName(&pName));
            CHKiRet(parserConstructViaModAndName(pNew, pName, NULL));
            break;
        case eMOD_STRGEN:
            /* first, we need to obtain the strgen object. We could not do that during
             * init as that would have caused class bootstrap issues which are not
             * absolutely necessary. Note that we can call objUse() multiple times, it
             * handles that.
             */
            CHKiRet(objUse(strgen, CORE_COMPONENT));
            CHKiRet((*pNew->modQueryEtryPt)((uchar *)"strgen", &pNew->mod.sm.strgen));
            CHKiRet((*pNew->modQueryEtryPt)((uchar *)"GetName", &GetName));
            CHKiRet(GetName(&pName));
            CHKiRet(strgen.Construct(&pStrgen));
            CHKiRet(strgen.SetName(pStrgen, pName));
            CHKiRet(strgen.SetModPtr(pStrgen, pNew));
            CHKiRet(strgen.ConstructFinalize(pStrgen));
            break;
        case eMOD_FUNCTION:
            CHKiRet((*pNew->modQueryEtryPt)((uchar *)"getFunctArray", &pNew->mod.fm.getFunctArray));
            int version;
            struct scriptFunct *functArray;
            pNew->mod.fm.getFunctArray(&version, &functArray);
            dbgprintf("LLL: %s\n", functArray[0].fname);
            addMod2List(version, functArray);
            break;
        case eMOD_ANY: /* this is mostly to keep the compiler happy! */
            DBGPRINTF("PROGRAM ERROR: eMOD_ANY set as module type\n");
            assert(0);
            break;
        default:
            // No action needed for other cases
            break;
    }

    pNew->pszName = (uchar *)strdup((char *)name); /* we do not care if strdup() fails, we can accept that */
    pNew->pModHdlr = pModHdlr;
    if (pModHdlr == NULL) {
        pNew->eLinkType = eMOD_LINK_STATIC;
    } else {
        pNew->eLinkType = eMOD_LINK_DYNAMIC_LOADED;

        /* if we need to keep the linked module, save it */
        if (pNew->eKeepType == eMOD_KEEP) {
            /* see if we have this one already */
            for (pHandle = pHandles; pHandle; pHandle = pHandle->next) {
                if (!strcmp((char *)name, (char *)pHandle->pszName)) break;
            }

            /* not found, create it */
            if (!pHandle) {
                if ((pHandle = malloc(sizeof(*pHandle))) == NULL) {
                    ABORT_FINALIZE(RS_RET_OUT_OF_MEMORY);
                }
                if ((pHandle->pszName = (uchar *)strdup((char *)name)) == NULL) {
                    free(pHandle);
                    ABORT_FINALIZE(RS_RET_OUT_OF_MEMORY);
                }
                pHandle->pModHdlr = pModHdlr;
                pHandle->next = pHandles;

                pHandles = pHandle;
            }
        }
    }

    /* we initialized the structure, now let's add it to the linked list of modules */
    addModToGlblList(pNew);
    *pNewModule = pNew;

finalize_it:
    if (iRet != RS_RET_OK) {
        if (pNew != NULL) moduleDestruct(pNew);
        *pNewModule = NULL;
    }

    RETiRet;
}

/* Print loaded modules. This is more or less a
 * debug or test aid, but anyhow I think it's worth it...
 * This only works if the dbgprintf() subsystem is initialized.
 * TODO: update for new input modules!
 */
static void modPrintList(void) {
    modInfo_t *pMod;

    pMod = GetNxt(NULL);
    while (pMod != NULL) {
        dbgprintf("Loaded Module: Name='%s', IFVersion=%d, ", (char *)modGetName(pMod), pMod->iIFVers);
        dbgprintf("type=");
        switch (pMod->eType) {
            case eMOD_OUT:
                dbgprintf("output");
                break;
            case eMOD_IN:
                dbgprintf("input");
                break;
            case eMOD_LIB:
                dbgprintf("library");
                break;
            case eMOD_PARSER:
                dbgprintf("parser");
                break;
            case eMOD_STRGEN:
                dbgprintf("strgen");
                break;
            case eMOD_FUNCTION:
                dbgprintf("function");
                break;
            case eMOD_ANY: /* this is mostly to keep the compiler happy! */
                DBGPRINTF("PROGRAM ERROR: eMOD_ANY set as module type\n");
                assert(0);
                break;
            default:
                // No action needed for other cases
                break;
        }
        dbgprintf(" module.\n");
        dbgprintf("Entry points:\n");
        dbgprintf("\tqueryEtryPt:        0x%lx\n", (unsigned long)pMod->modQueryEtryPt);
        dbgprintf("\tdbgPrintInstInfo:   0x%lx\n", (unsigned long)pMod->dbgPrintInstInfo);
        dbgprintf("\tfreeInstance:       0x%lx\n", (unsigned long)pMod->freeInstance);
        dbgprintf("\tbeginCnfLoad:       0x%lx\n", (unsigned long)pMod->beginCnfLoad);
        dbgprintf("\tSetModCnf:          0x%lx\n", (unsigned long)pMod->setModCnf);
        dbgprintf("\tcheckCnf:           0x%lx\n", (unsigned long)pMod->checkCnf);
        dbgprintf("\tactivateCnfPrePrivDrop: 0x%lx\n", (unsigned long)pMod->activateCnfPrePrivDrop);
        dbgprintf("\tactivateCnf:        0x%lx\n", (unsigned long)pMod->activateCnf);
        dbgprintf("\tfreeCnf:            0x%lx\n", (unsigned long)pMod->freeCnf);
        switch (pMod->eType) {
            case eMOD_OUT:
                dbgprintf("Output Module Entry Points:\n");
                dbgprintf("\tdoAction:           %p\n", pMod->mod.om.doAction);
                dbgprintf("\tparseSelectorAct:   %p\n", pMod->mod.om.parseSelectorAct);
                dbgprintf("\tnewActInst:         %p\n",
                          (pMod->mod.om.newActInst == dummynewActInst) ? NULL : pMod->mod.om.newActInst);
                dbgprintf("\ttryResume:          %p\n", pMod->tryResume);
                dbgprintf("\tdoHUP:              %p\n", pMod->doHUP);
                dbgprintf(
                    "\tBeginTransaction:   %p\n",
                    ((pMod->mod.om.beginTransaction == dummyBeginTransaction) ? NULL : pMod->mod.om.beginTransaction));
                dbgprintf("\tEndTransaction:     %p\n",
                          ((pMod->mod.om.endTransaction == dummyEndTransaction) ? NULL : pMod->mod.om.endTransaction));
                break;
            case eMOD_IN:
                dbgprintf("Input Module Entry Points\n");
                dbgprintf("\trunInput:           0x%lx\n", (unsigned long)pMod->mod.im.runInput);
                dbgprintf("\twillRun:            0x%lx\n", (unsigned long)pMod->mod.im.willRun);
                dbgprintf("\tafterRun:           0x%lx\n", (unsigned long)pMod->mod.im.afterRun);
                break;
            case eMOD_LIB:
                break;
            case eMOD_PARSER:
                dbgprintf("Parser Module Entry Points\n");
                dbgprintf("\tparse:              0x%lx\n", (unsigned long)pMod->mod.pm.parse);
                dbgprintf("\tparse2:             %p\n", pMod->mod.pm.parse2);
                dbgprintf("\tnewParserInst:      %p\n", pMod->mod.pm.newParserInst);
                dbgprintf("\tcheckParserInst:    %p\n", pMod->mod.pm.checkParserInst);
                dbgprintf("\tfreeParserInst:     %p\n", pMod->mod.pm.freeParserInst);
                break;
            case eMOD_STRGEN:
                dbgprintf("Strgen Module Entry Points\n");
                dbgprintf("\tstrgen:            0x%lx\n", (unsigned long)pMod->mod.sm.strgen);
                break;
            case eMOD_FUNCTION:
                dbgprintf("Function Module Entry Points\n");
                dbgprintf("\tgetFunctArray:     0x%lx\n", (unsigned long)pMod->mod.fm.getFunctArray);
                break;
            case eMOD_ANY: /* this is mostly to keep the compiler happy! */
                break;
            default:
                // No action needed for other cases
                break;
        }
        dbgprintf("\n");
        pMod = GetNxt(pMod); /* done, go next */
    }
}


/* HUP all modules that support it - except for actions, which
 * need (and have) specialised HUP handling.
 */
void modDoHUP(void) {
    modInfo_t *pMod;

    pthread_mutex_lock(&mutObjGlobalOp);
    pMod = GetNxt(NULL);
    while (pMod != NULL) {
        if (pMod->eType != eMOD_OUT && pMod->doHUP != NULL) {
            DBGPRINTF("HUPing module %s\n", (char *)modGetName(pMod));
            pMod->doHUP(NULL);
        }
        pMod = GetNxt(pMod); /* done, go next */
    }
    pthread_mutex_unlock(&mutObjGlobalOp);
}


/* unlink and destroy a module. The caller must provide a pointer to the module
 * itself as well as one to its immediate predecessor.
 * rgerhards, 2008-02-26
 */
static rsRetVal modUnlinkAndDestroy(modInfo_t **ppThis) {
    DEFiRet;
    modInfo_t *pThis;

    assert(ppThis != NULL);
    pThis = *ppThis;
    assert(pThis != NULL);

    pthread_mutex_lock(&mutObjGlobalOp);

    /* first check if we are permitted to unload */
    if (pThis->eType == eMOD_LIB) {
        if (pThis->uRefCnt > 0) {
            dbgprintf("module %s NOT unloaded because it still has a refcount of %u\n", pThis->pszName, pThis->uRefCnt);
            ABORT_FINALIZE(RS_RET_MODULE_STILL_REFERENCED);
        }
    }

    /* we need to unlink the module before we can destruct it -- rgerhards, 2008-02-26 */
    if (pThis->pPrev == NULL) {
        /* module is root, so we need to set a new root */
        pLoadedModules = pThis->pNext;
    } else {
        pThis->pPrev->pNext = pThis->pNext;
    }

    if (pThis->pNext == NULL) {
        pLoadedModulesLast = pThis->pPrev;
    } else {
        pThis->pNext->pPrev = pThis->pPrev;
    }

    /* finally, we are ready for the module to go away... */
    dbgprintf("Unloading module %s\n", modGetName(pThis));
    CHKiRet(modPrepareUnload(pThis));
    *ppThis = pThis->pNext;

    moduleDestruct(pThis);

finalize_it:
    pthread_mutex_unlock(&mutObjGlobalOp);
    RETiRet;
}


/* unload all loaded modules of a specific type (use eMOD_ALL if you want to
 * unload all module types). The unload happens only if the module is no longer
 * referenced. So some modules may survive this call.
 * rgerhards, 2008-03-11
 */
static rsRetVal modUnloadAndDestructAll(eModLinkType_t modLinkTypesToUnload) {
    DEFiRet;
    modInfo_t *pModCurr; /* module currently being processed */

    pModCurr = GetNxt(NULL);
    while (pModCurr != NULL) {
        if (modLinkTypesToUnload == eMOD_LINK_ALL || pModCurr->eLinkType == modLinkTypesToUnload) {
            if (modUnlinkAndDestroy(&pModCurr) == RS_RET_MODULE_STILL_REFERENCED) {
                pModCurr = GetNxt(pModCurr);
            } else {
                /* Note: if the module was successfully unloaded, it has updated the
                 * pModCurr pointer to the next module. However, the unload process may
                 * still have indirectly referenced the pointer list in a way that the
                 * unloaded module is not aware of. So we restart the unload process
                 * to make sure we do not fall into a trap (what we did ;)). The
                 * performance toll is minimal. -- rgerhards, 2008-04-28
                 */
                pModCurr = GetNxt(NULL);
            }
        } else {
            pModCurr = GetNxt(pModCurr);
        }
    }

    RETiRet;
}

/* find module with given name in global list */
static rsRetVal findModule(uchar *pModName, int iModNameLen, modInfo_t **pMod) {
    modInfo_t *pModInfo;
    uchar *pModNameCmp;
    DEFiRet;

    pModInfo = GetNxt(NULL);
    while (pModInfo != NULL) {
        if (!strncmp((char *)pModName, (char *)(pModNameCmp = modGetName(pModInfo)), iModNameLen) &&
            (!*(pModNameCmp + iModNameLen) || !strcmp((char *)pModNameCmp + iModNameLen, ".so"))) {
            dbgprintf("Module '%s' found\n", pModName);
            break;
        }
        pModInfo = GetNxt(pModInfo);
    }
    *pMod = pModInfo;
    RETiRet;
}


/* load a module and initialize it, based on doModLoad() from conf.c
 * rgerhards, 2008-03-05
 * varmojfekoj added support for dynamically loadable modules on 2007-08-13
 * rgerhards, 2007-09-25: please note that the non-threadsafe function dlerror() is
 * called below. This is ok because modules are currently only loaded during
 * configuration file processing, which is executed on a single thread. Should we
 * change that design at any stage (what is unlikely), we need to find a
 * replacement.
 * rgerhards, 2011-04-27:
 * Parameter "bConfLoad" tells us if the load was triggered by a config handler, in
 * which case we need to tie the loaded module to the current config. If bConfLoad == 0,
 * the system loads a module for internal reasons, this is not directly tied to a
 * configuration. We could also think if it would be useful to add only certain types
 * of modules, but the current implementation at least looks simpler.
 * Note: pvals = NULL means legacy config system
 */
static rsRetVal ATTR_NONNULL(1) Load(uchar *const pModName, const sbool bConfLoad, struct nvlst *const lst) {
    size_t iPathLen, iModNameLen;
    int bHasExtension;
    void *pModHdlr;
    pModInit_t pModInit;
    modInfo_t *pModInfo;
    cfgmodules_etry_t *pNew = NULL;
    cfgmodules_etry_t *pLast = NULL;
    uchar *pModDirCurr, *pModDirNext;
    struct dlhandle_s *pHandle = NULL;
    uchar pathBuf[PATH_MAX + 1];
    uchar *pPathBuf = pathBuf;
    size_t lenPathBuf = sizeof(pathBuf);
    rsRetVal localRet;
    cstr_t *load_err_msg = NULL;
    DEFiRet;

    assert(pModName != NULL);
    DBGPRINTF("Requested to load module '%s'\n", pModName);

    iModNameLen = strlen((char *)pModName);
    /* overhead for a full path is potentially 1 byte for a slash,
     * three bytes for ".so" and one byte for '\0'.
     */
#define PATHBUF_OVERHEAD 1 + iModNameLen + 3 + 1

    pthread_mutex_lock(&mutObjGlobalOp);

    if (iModNameLen > 3 && !strcmp((char *)pModName + iModNameLen - 3, ".so")) {
        iModNameLen -= 3;
        bHasExtension = RSTRUE;
    } else
        bHasExtension = RSFALSE;

    CHKiRet(findModule(pModName, iModNameLen, &pModInfo));
    if (pModInfo != NULL) {
        DBGPRINTF("Module '%s' already loaded\n", pModName);
        if (bConfLoad) {
            localRet = readyModForCnf(pModInfo, &pNew, &pLast);
            if (pModInfo->setModCnf != NULL && localRet == RS_RET_OK) {
                if (!strncmp((char *)pModName, "builtin:", sizeof("builtin:") - 1)) {
                    if (pModInfo->bSetModCnfCalled) {
                        LogError(0, RS_RET_DUP_PARAM, "parameters for built-in module %s already set - ignored\n",
                                 pModName);
                        ABORT_FINALIZE(RS_RET_DUP_PARAM);
                    } else {
                        /* for built-in moules, we need to call setModConf,
                         * because there is no way to set parameters at load
                         * time for obvious reasons...
                         */
                        if (lst != NULL) pModInfo->setModCnf(lst);
                        pModInfo->bSetModCnfCalled = 1;
                    }
                } else {
                    /* regular modules need to be added to conf list (for
                     * builtins, this happend during initial load).
                     */
                    addModToCnfList(&pNew, pLast);
                }
            }
        }
        FINALIZE;
    }

    pModDirCurr = (uchar *)((pModDir == NULL) ? _PATH_MODDIR : (char *)pModDir);
    pModDirNext = NULL;
    pModHdlr = NULL;
    do { /* now build our load module name */
        if (*pModName == '/' || *pModName == '.') {
            if (lenPathBuf < PATHBUF_OVERHEAD) {
                if (pPathBuf != pathBuf) /* already malloc()ed memory? */
                    free(pPathBuf);
                /* we always alloc enough memory for everything we potentiall need to add */
                lenPathBuf = PATHBUF_OVERHEAD;
                CHKmalloc(pPathBuf = malloc(lenPathBuf));
            }
            *pPathBuf = '\0'; /* we do not need to append the path - its already in the module name */
            iPathLen = 0;
        } else {
            *pPathBuf = '\0';

            iPathLen = strlen((char *)pModDirCurr);
            pModDirNext = (uchar *)strchr((char *)pModDirCurr, ':');
            if (pModDirNext) iPathLen = (size_t)(pModDirNext - pModDirCurr);

            if (iPathLen == 0) {
                if (pModDirNext) {
                    pModDirCurr = pModDirNext + 1;
                    continue;
                }
                break;
            } else if (iPathLen > lenPathBuf - PATHBUF_OVERHEAD) {
                if (pPathBuf != pathBuf) /* already malloc()ed memory? */
                    free(pPathBuf);
                /* we always alloc enough memory for everything we potentiall need to add */
                lenPathBuf = iPathLen + PATHBUF_OVERHEAD;
                CHKmalloc(pPathBuf = malloc(lenPathBuf));
            }

            memcpy((char *)pPathBuf, (char *)pModDirCurr, iPathLen);
            if ((pPathBuf[iPathLen - 1] != '/')) {
                /* we have space, made sure in previous check */
                pPathBuf[iPathLen++] = '/';
            }
            pPathBuf[iPathLen] = '\0';

            if (pModDirNext) pModDirCurr = pModDirNext + 1;
        }

        /* ... add actual name ... */
        strncat((char *)pPathBuf, (char *)pModName, lenPathBuf - iPathLen - 1);

        /* now see if we have an extension and, if not, append ".so" */
        if (!bHasExtension) {
            /* we do not have an extension and so need to add ".so"
             * TODO: I guess this is highly importable, so we should change the
             * algo over time... -- rgerhards, 2008-03-05
             */
            strncat((char *)pPathBuf, ".so", lenPathBuf - strlen((char *)pPathBuf) - 1);
        }

        /* complete load path constructed, so ... GO! */
        dbgprintf("loading module '%s'\n", pPathBuf);

        /* see if we have this one already */
        for (pHandle = pHandles; pHandle; pHandle = pHandle->next) {
            if (!strcmp((char *)pModName, (char *)pHandle->pszName)) {
                pModHdlr = pHandle->pModHdlr;
                break;
            }
        }

        /* not found, try to dynamically link it */
        if (!pModHdlr) {
            pModHdlr = dlopen((char *)pPathBuf, RTLD_NOW);
        }

        if (pModHdlr == NULL) {
            char errmsg[4096];
            snprintf(errmsg, sizeof(errmsg), "%strying to load module %s: %s",
                     (load_err_msg == NULL) ? "" : "  ////////  ", pPathBuf, dlerror());
            if (load_err_msg == NULL) {
                rsCStrConstructFromszStr(&load_err_msg, (uchar *)errmsg);
            } else {
                rsCStrAppendStr(load_err_msg, (uchar *)errmsg);
            }
        }

    } while (pModHdlr == NULL && *pModName != '/' && pModDirNext);

    if (load_err_msg != NULL) {
        cstrFinalize(load_err_msg);
    }

    if (!pModHdlr) {
        LogError(0, RS_RET_MODULE_LOAD_ERR_DLOPEN, "could not load module '%s', errors: %s", pModName,
                 (load_err_msg == NULL) ? "NONE SEEN???" : (const char *)cstrGetSzStrNoNULL(load_err_msg));
        ABORT_FINALIZE(RS_RET_MODULE_LOAD_ERR_DLOPEN);
    }
    if (!(pModInit = (pModInit_t)dlsym(pModHdlr, "modInit"))) {
        LogError(0, RS_RET_MODULE_LOAD_ERR_NO_INIT, "could not load module '%s', dlsym: %s\n", pPathBuf, dlerror());
        dlclose(pModHdlr);
        ABORT_FINALIZE(RS_RET_MODULE_LOAD_ERR_NO_INIT);
    }
    if ((iRet = doModInit(pModInit, (uchar *)pModName, pModHdlr, &pModInfo)) != RS_RET_OK) {
        LogError(0, RS_RET_MODULE_LOAD_ERR_INIT_FAILED, "could not load module '%s', rsyslog error %d\n", pPathBuf,
                 iRet);
        dlclose(pModHdlr);
        ABORT_FINALIZE(RS_RET_MODULE_LOAD_ERR_INIT_FAILED);
    }

    if (bConfLoad) {
        readyModForCnf(pModInfo, &pNew, &pLast);
        if (pModInfo->setModCnf != NULL) {
            if (lst != NULL) {
                localRet = pModInfo->setModCnf(lst);
                if (localRet != RS_RET_OK) {
                    LogError(0, localRet, "module '%s', failed processing config parameters", pPathBuf);
                    ABORT_FINALIZE(localRet);
                }
            }
            pModInfo->bSetModCnfCalled = 1;
        }
        addModToCnfList(&pNew, pLast);
    }

finalize_it:
    if (load_err_msg != NULL) {
        cstrDestruct(&load_err_msg);
    }
    if (pPathBuf != pathBuf) /* used malloc()ed memory? */
        free(pPathBuf);
    if (iRet != RS_RET_OK) abortCnfUse(&pNew);
    free(pNew); /* is NULL again if properly consumed, else clean up */
    pthread_mutex_unlock(&mutObjGlobalOp);
    RETiRet;
}


/* the v6+ way of loading modules: process a "module(...)" directive.
 * rgerhards, 2012-06-20
 */
rsRetVal modulesProcessCnf(struct cnfobj *o) {
    struct cnfparamvals *pvals;
    uchar *cnfModName = NULL;
    int typeIdx;
    DEFiRet;

    pvals = nvlstGetParams(o->nvlst, &pblk, NULL);
    if (pvals == NULL) {
        ABORT_FINALIZE(RS_RET_ERR);
    }
    DBGPRINTF("modulesProcessCnf params:\n");
    cnfparamsPrint(&pblk, pvals);
    typeIdx = cnfparamGetIdx(&pblk, "load");
    if (pvals[typeIdx].bUsed == 0) {
        LogError(0, RS_RET_CONF_RQRD_PARAM_MISSING, "module type missing");
        ABORT_FINALIZE(RS_RET_CONF_RQRD_PARAM_MISSING);
    }

    cnfModName = (uchar *)es_str2cstr(pvals[typeIdx].val.d.estr, NULL);
    iRet = Load(cnfModName, 1, o->nvlst);

finalize_it:
    free(cnfModName);
    cnfparamvalsDestruct(pvals, &pblk);
    RETiRet;
}


/* set the default module load directory. A NULL value may be provided, in
 * which case any previous value is deleted but no new one set. The caller-provided
 * string is duplicated. If it needs to be freed, that's the caller's duty.
 * rgerhards, 2008-03-07
 */
static rsRetVal SetModDir(uchar *pszModDir) {
    DEFiRet;

    dbgprintf("setting default module load directory '%s'\n", pszModDir);
    if (pModDir != NULL) {
        free(pModDir);
    }

    pModDir = (uchar *)strdup((char *)pszModDir);

    RETiRet;
}


/* Reference-Counting object access: add 1 to the current reference count. Must be
 * called by anyone interested in using a module. -- rgerhards, 20080-03-10
 */
static rsRetVal Use(const char *srcFile, modInfo_t *pThis) {
    DEFiRet;

    assert(pThis != NULL);
    pThis->uRefCnt++;
    dbgprintf("source file %s requested reference for module '%s', reference count now %u\n", srcFile, pThis->pszName,
              pThis->uRefCnt);

#ifdef DEBUG
    modUsrAdd(pThis, srcFile);
#endif

    RETiRet;
}


/* Reference-Counting object access: subract one from the current refcount. Must
 * by called by anyone who no longer needs a module. If count reaches 0, the
 * module is unloaded. -- rgerhards, 20080-03-10
 */
static rsRetVal Release(const char *srcFile, modInfo_t **ppThis) {
    DEFiRet;
    modInfo_t *pThis;

    assert(ppThis != NULL);
    pThis = *ppThis;
    assert(pThis != NULL);
    if (pThis->uRefCnt == 0) {
        /* oops, we are already at 0? */
        dbgprintf("internal error: module '%s' already has a refcount of 0 (released by %s)!\n", pThis->pszName,
                  srcFile);
    } else {
        --pThis->uRefCnt;
        dbgprintf("file %s released module '%s', reference count now %u\n", srcFile, pThis->pszName, pThis->uRefCnt);
#ifdef DEBUG
        modUsrDel(pThis, srcFile);
        modUsrPrint(pThis);
#endif
    }

    if (pThis->uRefCnt == 0) {
        /* we have a zero refcount, so we must unload the module */
        dbgprintf("module '%s' has zero reference count, unloading...\n", pThis->pszName);
        modUnlinkAndDestroy(&pThis);
        /* we must NOT do a *ppThis = NULL, because ppThis now points into freed memory!
         * If in doubt, see obj.c::ReleaseObj() for how we are called.
         */
    }

    RETiRet;
}


/* exit our class
 * rgerhards, 2008-03-11
 */
BEGINObjClassExit(module, OBJ_IS_LOADABLE_MODULE) /* CHANGE class also in END MACRO! */
    CODESTARTObjClassExit(module);
    /* release objects we no longer need */
    free(pModDir);
#ifdef DEBUG
    modUsrPrintAll(); /* debug aid - TODO: integrate with debug.c, at least the settings! */
#endif
ENDObjClassExit(module)


/* queryInterface function
 * rgerhards, 2008-03-05
 */
BEGINobjQueryInterface(module)
    CODESTARTobjQueryInterface(module);
    if (pIf->ifVersion != moduleCURR_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->GetNxt = GetNxt;
    pIf->GetNxtCnfType = GetNxtCnfType;
    pIf->GetName = modGetName;
    pIf->GetStateName = modGetStateName;
    pIf->PrintList = modPrintList;
    pIf->FindWithCnfName = FindWithCnfName;
    pIf->UnloadAndDestructAll = modUnloadAndDestructAll;
    pIf->doModInit = doModInit;
    pIf->SetModDir = SetModDir;
    pIf->Load = Load;
    pIf->Use = Use;
    pIf->Release = Release;
finalize_it:
ENDobjQueryInterface(module)


/* Initialize our class. Must be called as the very first method
 * before anything else is called inside this class.
 * rgerhards, 2008-03-05
 */
BEGINAbstractObjClassInit(module, 1, OBJ_IS_CORE_MODULE) /* class, version - CHANGE class also in END MACRO! */
    uchar *pModPath;

    /* use any module load path specified in the environment */
    if ((pModPath = (uchar *)getenv("RSYSLOG_MODDIR")) != NULL) {
        SetModDir(pModPath);
    }

    /* now check if another module path was set via the command line (-M)
     * if so, that overrides the environment. Please note that we must use
     * a global setting here because the command line parser can NOT call
     * into the module object, because it is not initialized at that point. So
     * instead a global setting is changed and we pick it up as soon as we
     * initialize -- rgerhards, 2008-04-04
     */
    if (glblModPath != NULL) {
        SetModDir(glblModPath);
    }

    /* request objects we use */
ENDObjClassInit(module)

/* vi:set ai:
 */
