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/* omrelp.c
 *
 * This is the implementation of the RELP output module.
 *
 * NOTE: read comments in module-template.h to understand how this file
 *       works!
 *
 * File begun on 2008-03-13 by RGerhards
 *
 * Copyright 2008 Rainer Gerhards and Adiscon GmbH.
 *
 * This file is part of rsyslog.
 *
 * Rsyslog 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 3 of the License, or
 * (at your option) any later version.
 *
 * Rsyslog 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 Rsyslog.  If not, see <http://www.gnu.org/licenses/>.
 *
 * 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 <assert.h>
#include <errno.h>
#include <ctype.h>
#include <librelp.h>
#include "syslogd.h"
#include "syslogd-types.h"
#include "srUtils.h"
#include "cfsysline.h"
#include "module-template.h"
#include "errmsg.h"

MODULE_TYPE_OUTPUT

/* internal structures
 */
DEF_OMOD_STATIC_DATA
DEFobjCurrIf(errmsg)

static relpEngine_t *pRelpEngine;	/* our relp engine */

typedef struct _instanceData {
	char *f_hname;
	int compressionLevel; /* 0 - no compression, else level for zlib */
	char *port;
	int bInitialConnect; /* is this the initial connection request of our module? (0-no, 1-yes) */
	int bIsConnected; /* currently connected to server? 0 - no, 1 - yes */
	relpClt_t *pRelpClt;		/* relp client for this instance */
} instanceData;

/* get the syslog forward port from selector_t. The passed in
 * struct must be one that is setup for forwarding.
 * rgerhards, 2007-06-28
 * We may change the implementation to try to lookup the port
 * if it is unspecified. So far, we use the IANA default auf 514.
 */
static char *getRelpPt(instanceData *pData)
{
	assert(pData != NULL);
	if(pData->port == NULL)
		return("514");
	else
		return(pData->port);
}

BEGINcreateInstance
CODESTARTcreateInstance
	pData->bInitialConnect = 1;
ENDcreateInstance


BEGINisCompatibleWithFeature
CODESTARTisCompatibleWithFeature
	if(eFeat == sFEATURERepeatedMsgReduction)
		iRet = RS_RET_OK;
ENDisCompatibleWithFeature


BEGINfreeInstance
CODESTARTfreeInstance
	if(pData->port != NULL)
		free(pData->port);

	/* final cleanup */
	if(pData->pRelpClt != NULL)
		relpEngineCltDestruct(pRelpEngine, &pData->pRelpClt);

	if(pData->f_hname != NULL)
		free(pData->f_hname);

ENDfreeInstance


BEGINdbgPrintInstInfo
CODESTARTdbgPrintInstInfo
	printf("RELP/%s", pData->f_hname);
ENDdbgPrintInstInfo


/* try to connect to server
 * rgerhards, 2008-03-21
 */
static rsRetVal doConnect(instanceData *pData)
{
	DEFiRet;

	if(pData->bInitialConnect) {
		iRet = relpCltConnect(pData->pRelpClt, family, (uchar*) pData->port, (uchar*) pData->f_hname);
		if(iRet == RELP_RET_OK)
			pData->bInitialConnect = 0;
	} else {
		iRet = relpCltReconnect(pData->pRelpClt);
	}

	if(iRet == RELP_RET_OK) {
		pData->bIsConnected = 1;
	} else {
		pData->bIsConnected = 0;
		iRet = RS_RET_SUSPENDED;
	}

	RETiRet;
}


BEGINtryResume
CODESTARTtryResume
	iRet = doConnect(pData);
ENDtryResume


BEGINdoAction
	uchar *pMsg; /* temporary buffering */
	size_t lenMsg;
	relpRetVal ret;
CODESTARTdoAction
	dbgprintf(" %s:%s/RELP\n", pData->f_hname, getRelpPt(pData));

	if(!pData->bIsConnected) {
		CHKiRet(doConnect(pData));
	}

	pMsg = ppString[0];
	lenMsg = strlen((char*) pMsg); /* TODO: don't we get this? */

	/* TODO: think about handling oversize messages! */
	if(lenMsg > MAXLINE)
		lenMsg = MAXLINE;

	/* forward */
	ret = relpCltSendSyslog(pData->pRelpClt, (uchar*) pMsg, lenMsg);
RUNLOG_VAR("%d", ret);
	if(ret != RELP_RET_OK) {
		/* error! */
		dbgprintf("error forwarding via relp, suspending\n");
		iRet = RS_RET_SUSPENDED;
	}

finalize_it:
ENDdoAction


BEGINparseSelectorAct
	uchar *q;
	int i;
	int bErr;
CODESTARTparseSelectorAct
CODE_STD_STRING_REQUESTparseSelectorAct(1)