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/* modules.c
* This is the implementation of syslogd modules object.
* This object handles plug-ins and buil-in modules of all kind.
*
* File begun on 2007-07-22 by RGerhards
*
* Copyright 2007 Rainer Gerhards and Adiscon GmbH.
*
* This program 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 2
* of the License, or (at your option) any later version.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* A copy of the GPL can be found in the file "COPYING" in this distribution.
*/
#include "config.h"
#include "rsyslog.h"
#include <stdio.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <assert.h>
#include <errno.h>
#include <unistd.h>
#include <sys/file.h>
#include "syslogd.h"
#include "modules.h"
static modInfo_t *pLoadedModules = NULL; /* list of currently-loaded modules */
static modInfo_t *pLoadedModulesLast = NULL; /* tail-pointer */
/* 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 objects. The object must not be linked to the
* linked list of modules.
*/
static void moduleDestruct(modInfo_t *pThis)
{
free(pThis);
}
/* 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
*/
uchar *modGetStateName(modInfo_t *pThis)
{
return(modGetName(pThis));
}
/* get the name of a module
*/
uchar *modGetName(modInfo_t *pThis)
{
return((pThis->pszName == NULL) ? (uchar*) "" : pThis->pszName);
}
/* Add a module to the loaded module linked list
*/
static inline void addModToList(modInfo_t *pThis)
{
assert(pThis != NULL);
if(pLoadedModules == NULL) {
pLoadedModules = pLoadedModulesLast = pThis;
} else {
/* there already exist entries */
pLoadedModulesLast->pNext = pThis;
pLoadedModulesLast = pThis;
}
}
/* 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
*/
modInfo_t *modGetNxt(modInfo_t *pThis)
{
modInfo_t *pNew;
if(pThis == NULL)
pNew = pLoadedModules;
else
pNew = pThis->pNext;
return(pNew);
}
/* this function is like modGetNxt(), but it returns pointers to
* output modules only. As we currently deal just with output modules,
* it is a dummy, to be filled with real code later.
* rgerhards, 2007-07-24
*/
modInfo_t *omodGetNxt(modInfo_t *pThis)
{
return(modGetNxt(pThis));
}
/* Add an already-loaded module to the module linked list. This function does
* anything that is needed to fully initialize the module.
*/
rsRetVal doModInit(rsRetVal (*modInit)(int, int*, rsRetVal(**)()), uchar *name)
{
modInfo_t *pNew;
rsRetVal iRet;
assert(modInit != NULL);
if((iRet = moduleConstruct(&pNew)) != RS_RET_OK)
return iRet;
if((iRet = (*modInit)(1, &pNew->iIFVers, &pNew->modQueryEtryPt)) != RS_RET_OK) {
moduleDestruct(pNew);
return iRet;
}
if(pNew->iIFVers != 1) {
moduleDestruct(pNew);
return RS_RET_MISSING_INTERFACE;
}
/* OK, we know we can successfully work with the module. So we now fill the
* rest of the data elements.
*/
if((iRet = (*pNew->modQueryEtryPt)((uchar*)"doAction", &pNew->mod.om.doAction)) != RS_RET_OK) {
moduleDestruct(pNew);
return iRet;
}
if((iRet = (*pNew->modQueryEtryPt)((uchar*)"parseSelectorAct", &pNew->mod.om.parseSelectorAct)) != RS_RET_OK) {
moduleDestruct(pNew);
return iRet;
}
if((iRet = (*pNew->modQueryEtryPt)((uchar*)"isCompatibleWithFeature",
&pNew->isCompatibleWithFeature)) != RS_RET_OK) {
moduleDestruct(pNew);
return iRet;
}
if((iRet = (*pNew->modQueryEtryPt)((uchar*)"freeInstance", &pNew->freeInstance)) != RS_RET_OK) {
moduleDestruct(pNew);
return iRet;
}
pNew->pszName = (uchar*) strdup((char*)name); /* we do not care if strdup() fails, we can accept that */
pNew->eType = eMOD_OUT; /* TODO: take this from module */
/* we initialized the structure, now let's add it to the linked list of modules */
addModToList(pNew);
return RS_RET_OK;
}
/* 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 dprintf() subsystem is initialized.
*/
void modPrintList(void)
{
modInfo_t *pMod;
pMod = modGetNxt(NULL);
while(pMod != NULL) {
dprintf("Loaded Module: Name='%s', IFVersion=%d, ",
(char*) modGetName(pMod), pMod->iIFVers);
dprintf("type=");
switch(pMod->eType) {
case eMOD_OUT:
dprintf("output");
break;
case eMOD_IN:
dprintf("input");
break;
case eMOD_FILTER:
dprintf("filter");
break;
}
dprintf(" module.\n");
dprintf("Entry points:\n");
dprintf("\tqueryEtryPt: 0x%x\n", (unsigned) pMod->modQueryEtryPt);
dprintf("\tdoAction: 0x%x\n", (unsigned) pMod->mod.om.doAction);
dprintf("\tparseSelectorAct: 0x%x\n", (unsigned) pMod->mod.om.parseSelectorAct);
dprintf("\tfreeInstance: 0x%x\n", (unsigned) pMod->freeInstance);
dprintf("\n");
pMod = modGetNxt(pMod); /* done, go next */
}
}
/*
* vi:set ai:
*/
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