/* omshell.c
 * This is the implementation of the build-in shell output module.
 *
 * shell support was initially written by bkalkbrenner 2005-09-20
 *
 * File begun on 2007-07-20 by RGerhards (extracted from syslogd.c)
 * This file is under development and has not yet arrived at being fully
 * self-contained and a real object. So far, it is mostly an excerpt
 * of the "old" message code without any modifications. However, it
 * helps to have things at the right place one we go to the meat of it.
 *
 * 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 <stdio.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include "rsyslog.h"
#include "syslogd.h"
#include "syslogd-types.h"
#include "srUtils.h"
#include "omshell.h"


/* query feature compatibility
 */
static rsRetVal isCompatibleWithFeature(syslogFeature eFeat)
{
	if(eFeat == sFEATURERepeatedMsgReduction)
		return RS_RET_OK;

	return RS_RET_INCOMPATIBLE;
}


/* call the shell action
 */
static rsRetVal doActionShell(selector_t *f)
{
	uchar *psz;

	assert(f != NULL);
	/* TODO: using f->f_un.f_file.f_name is not clean from the point of
	 * modularization. We'll change that as we go ahead with modularization.
	 * rgerhards, 2007-07-20
	 */
	dprintf("\n");
	iovCreate(f);
	psz = (uchar*) iovAsString(f);
	if(execProg((uchar*) f->f_un.f_file.f_fname, 1, (uchar*) psz) == 0)
		logerrorSz("Executing program '%s' failed", f->f_un.f_file.f_fname);

	return RS_RET_OK;
}


/* try to process a selector action line. Checks if the action
 * applies to this module and, if so, processed it. If not, it
 * is left untouched. The driver will then call another module
 */
static rsRetVal parseSelectorAct(uchar **pp, selector_t *f)
{
	uchar *p;
	rsRetVal iRet = RS_RET_CONFLINE_PROCESSED;

	assert(pp != NULL);
	assert(f != NULL);

	p = *pp;

	switch (*p)
	{
	case '^': /* bkalkbrenner 2005-09-20: execute shell command */
		dprintf("exec\n");
		++p;
		if((iRet = cflineParseFileName(f, p)) == RS_RET_OK)
			if (f->f_type == F_FILE) {
				f->f_type = F_SHELL;
			}
		break;
	default:
		iRet = RS_RET_CONFLINE_UNPROCESSED;
		break;
	}

	if(iRet == RS_RET_OK)
		iRet = RS_RET_CONFLINE_PROCESSED;

	if(iRet == RS_RET_CONFLINE_PROCESSED)
		*pp = p;
	return iRet;
}


/* free an instance
 */
static rsRetVal freeInstance(selector_t *f)
{
	assert(f != NULL);
	return RS_RET_OK;
}

/* query an entry point
 */
static rsRetVal queryEtryPt(uchar *name, rsRetVal (**pEtryPoint)())
{
	if((name == NULL) || (pEtryPoint == NULL))
		return RS_RET_PARAM_ERROR;

	*pEtryPoint = NULL;
	if(!strcmp((char*) name, "doAction")) {
		*pEtryPoint = doActionShell;
	} else if(!strcmp((char*) name, "parseSelectorAct")) {
		*pEtryPoint = parseSelectorAct;
	} else if(!strcmp((char*) name, "isCompatibleWithFeature")) {
		*pEtryPoint = isCompatibleWithFeature;
	} else if(!strcmp((char*) name, "freeInstance")) {
		*pEtryPoint = freeInstance; 
	}

	return(*pEtryPoint == NULL) ? RS_RET_NOT_FOUND : RS_RET_OK;
}

/* initialize the module
 *
 * Later, much more must be done. So far, we only return a pointer
 * to the queryEtryPt() function
 * TODO: do interface version checking & handshaking
 * iIfVersRequeted is the version of the interface specification that the
 * caller would like to see being used. ipIFVersProvided is what we
 * decide to provide.
 */
rsRetVal modInitShell(int iIFVersRequested __attribute__((unused)), int *ipIFVersProvided, rsRetVal (**pQueryEtryPt)())
{
	if((pQueryEtryPt == NULL) || (ipIFVersProvided == NULL))
		return RS_RET_PARAM_ERROR;

	*ipIFVersProvided = 1; /* so far, we only support the initial definition */

	*pQueryEtryPt = queryEtryPt;
	return RS_RET_OK;
}
/*
 * vi:set ai:
 */