/* smfwd.c
 * This is a strgen module for the traditional (network) forwarding format.
 *
 * Format generated:
 * "<%PRI%>%TIMESTAMP:::date-rfc3339% %HOSTNAME% %syslogtag:1:32%%msg:::sp-if-no-1st-sp%%msg%"
 *
 * NOTE: read comments in module-template.h to understand how this file
 *       works!
 *
 * File begun on 2010-06-01 by RGerhards
 *
 * Copyright 2010-2016 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 "syslogd.h"
#include "conf.h"
#include "syslogd-types.h"
#include "template.h"
#include "msg.h"
#include "module-template.h"
#include "unicode-helper.h"

MODULE_TYPE_STRGEN
MODULE_TYPE_NOKEEP;
STRGEN_NAME("RSYSLOG_ForwardFormat")

/* internal structures
 */
DEF_SMOD_STATIC_DATA;


/* config data */


/* This strgen tries to minimize the amount of reallocs be first obtaining pointers to all strings
 * needed (including their length) and then calculating the actual space required. So when we
 * finally copy, we know exactly what we need. So we do at most one alloc.
 */
BEGINstrgen
    register int iBuf;
    const char *pPRI;
    size_t lenPRI;
    uchar *pTimeStamp;
    size_t lenTimeStamp;
    uchar *pHOSTNAME;
    size_t lenHOSTNAME;
    uchar *pTAG;
    int lenTAG;
    uchar *pMSG;
    size_t lenMSG;
    size_t lenTotal;
    CODESTARTstrgen;
    /* first obtain all strings and their length (if not fixed) */
    pPRI = getPRI(pMsg);
    lenPRI = strlen(pPRI);
    pTimeStamp = (uchar *)getTimeReported(pMsg, tplFmtRFC3339Date);
    lenTimeStamp = ustrlen(pTimeStamp);
    pHOSTNAME = (uchar *)getHOSTNAME(pMsg);
    lenHOSTNAME = getHOSTNAMELen(pMsg);
    getTAG(pMsg, &pTAG, &lenTAG, LOCK_MUTEX);
    if (lenTAG > 32) lenTAG = 32; /* for forwarding, a max of 32 chars is permitted (RFC!) */
    pMSG = getMSG(pMsg);
    lenMSG = getMSGLen(pMsg);

    /* calculate len, constants for spaces and similar fixed strings */
    lenTotal = 1 + lenPRI + 1 + lenTimeStamp + 1 + lenHOSTNAME + 1 + lenTAG + lenMSG + 1;
    if (pMSG[0] != ' ') ++lenTotal; /* then we need to introduce one additional space */

    /* now make sure buffer is large enough */
    if (lenTotal >= iparam->lenBuf) CHKiRet(ExtendBuf(iparam, lenTotal));

    /* and concatenate the resulting string */
    iparam->param[0] = '<';
    memcpy(iparam->param + 1, pPRI, lenPRI);
    iBuf = lenPRI + 1;
    iparam->param[iBuf++] = '>';

    memcpy(iparam->param + iBuf, pTimeStamp, lenTimeStamp);
    iBuf += lenTimeStamp;
    iparam->param[iBuf++] = ' ';

    memcpy(iparam->param + iBuf, pHOSTNAME, lenHOSTNAME);
    iBuf += lenHOSTNAME;
    iparam->param[iBuf++] = ' ';

    memcpy(iparam->param + iBuf, pTAG, lenTAG);
    iBuf += lenTAG;

    if (pMSG[0] != ' ') iparam->param[iBuf++] = ' ';
    memcpy(iparam->param + iBuf, pMSG, lenMSG);
    iBuf += lenMSG;

    /* string terminator */
    iparam->param[iBuf] = '\0';

    iparam->lenStr = lenTotal - 1; /* do not count \0! */

finalize_it:
ENDstrgen


BEGINmodExit
    CODESTARTmodExit;
ENDmodExit


BEGINqueryEtryPt
    CODESTARTqueryEtryPt;
    CODEqueryEtryPt_STD_SMOD_QUERIES;
ENDqueryEtryPt


BEGINmodInit(smfwd)
    CODESTARTmodInit;
    *ipIFVersProvided = CURR_MOD_IF_VERSION; /* we only support the current interface specification */
    CODEmodInit_QueryRegCFSLineHdlr

        dbgprintf(
            "rsyslog standard (network) forward format strgen init called, compiled with version"
            " %s\n",
            VERSION);
ENDmodInit
