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/* imtcp.c
* This is the implementation of the TCP input module.
*
* File begun on 2007-12-21 by RGerhards (extracted from syslogd.c)
*
* Copyright 2007 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 <stdlib.h>
#include <assert.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <stdarg.h>
#include <ctype.h>
#include <netinet/in.h>
#include <netdb.h>
#include <sys/types.h>
#include <sys/socket.h>
#if HAVE_FCNTL_H
#include <fcntl.h>
#endif
#include "rsyslog.h"
#include "syslogd.h"
#include "cfsysline.h"
#include "module-template.h"
#include "net.h"
#include "tcpsrv.h"
MODULE_TYPE_INPUT
/* static data */
DEF_IMOD_STATIC_DATA
DEFobjCurrIf(tcpsrv)
DEFobjCurrIf(tcps_sess)
DEFobjCurrIf(net)
/* Module static data */
static tcpsrv_t *pOurTcpsrv = NULL; /* our TCP server(listener) TODO: change for multiple instances */
/* config settings */
static int iTCPSessMax = 200; /* max number of sessions */
/* callbacks */
/* this shall go into a specific ACL module! */
static int
isPermittedHost(struct sockaddr *addr, char *fromHostFQDN, void __attribute__((unused)) *pUsrSrv,
void __attribute__((unused)) *pUsrSess)
{
return net.isAllowedSender(net.pAllowedSenders_TCP, addr, fromHostFQDN);
}
static rsRetVal
onSessAccept(tcpsrv_t *pThis, tcps_sess_t **ppSess, int fd)
{
DEFiRet;
iRet = tcpsrv.SessAccept(pThis, ppSess, fd);
RETiRet;
}
static int*
doOpenLstnSocks(tcpsrv_t *pSrv)
{
ISOBJ_TYPE_assert(pSrv, tcpsrv);
return tcpsrv.create_tcp_socket(pSrv);
}
static int
doRcvData(tcps_sess_t *pSess, char *buf, size_t lenBuf)
{
int state;
assert(pSess != NULL);
state = recv(pSess->sock, buf, lenBuf, 0);
return state;
}
static rsRetVal
onRegularClose(tcps_sess_t *pSess)
{
DEFiRet;
assert(pSess != NULL);
/* process any incomplete frames left over */
tcps_sess.PrepareClose(pSess);
/* Session closed */
tcps_sess.Close(pSess);
RETiRet;
}
static rsRetVal
onErrClose(tcps_sess_t *pSess)
{
DEFiRet;
assert(pSess != NULL);
tcps_sess.Close(pSess);
RETiRet;
}
/* ------------------------------ end callbacks ------------------------------ */
static rsRetVal addTCPListener(void __attribute__((unused)) *pVal, uchar *pNewVal)
{
DEFiRet;
if(pOurTcpsrv == NULL) {
CHKiRet(tcpsrv.Construct(&pOurTcpsrv));
/* TODO: fill params! */
CHKiRet(tcpsrv.SetCBIsPermittedHost(pOurTcpsrv, isPermittedHost));
CHKiRet(tcpsrv.SetCBRcvData(pOurTcpsrv, doRcvData));
CHKiRet(tcpsrv.SetCBOpenLstnSocks(pOurTcpsrv, doOpenLstnSocks));
//CHKiRet(tcpsrv.SetCBOnListenDeinit(pOurTcpsrv, ));
CHKiRet(tcpsrv.SetCBOnSessAccept(pOurTcpsrv, onSessAccept));
CHKiRet(tcpsrv.SetCBOnRegularClose(pOurTcpsrv, onRegularClose));
CHKiRet(tcpsrv.SetCBOnErrClose(pOurTcpsrv, onErrClose));
tcpsrv.configureTCPListen(pOurTcpsrv, (char *) pNewVal);
CHKiRet(tcpsrv.ConstructFinalize(pOurTcpsrv));
}
finalize_it:
RETiRet;
}
/* This function is called to gather input.
*/
BEGINrunInput
CODESTARTrunInput
/* TODO: we must be careful to start the listener here. Currently, tcpsrv.c seems to
* do that in ConstructFinalize
*/
iRet = tcpsrv.Run(pOurTcpsrv);
ENDrunInput
/* initialize and return if will run or not */
BEGINwillRun
CODESTARTwillRun
/* first apply some config settings */
net.PrintAllowedSenders(2); /* TCP */
if(pOurTcpsrv == NULL)
ABORT_FINALIZE(RS_RET_NO_RUN);
finalize_it:
ENDwillRun
BEGINafterRun
CODESTARTafterRun
/* do cleanup here */
if(net.pAllowedSenders_TCP != NULL) {
net.clearAllowedSenders(net.pAllowedSenders_TCP);
net.pAllowedSenders_TCP = NULL;
}
ENDafterRun
BEGINmodExit
CODESTARTmodExit
if(pOurTcpsrv != NULL)
iRet = tcpsrv.Destruct(&pOurTcpsrv);
/* release objects we used */
objRelease(net, LM_NET_FILENAME);
objRelease(tcps_sess, LM_TCPSRV_FILENAME);
objRelease(tcpsrv, LM_TCPSRV_FILENAME);
ENDmodExit
static rsRetVal
resetConfigVariables(uchar __attribute__((unused)) *pp, void __attribute__((unused)) *pVal)
{
iTCPSessMax = 200;
return RS_RET_OK;
}
BEGINqueryEtryPt
CODESTARTqueryEtryPt
CODEqueryEtryPt_STD_IMOD_QUERIES
ENDqueryEtryPt
BEGINmodInit()
CODESTARTmodInit
*ipIFVersProvided = CURR_MOD_IF_VERSION; /* we only support the current interface specification */
CODEmodInit_QueryRegCFSLineHdlr
pOurTcpsrv = NULL;
/* request objects we use */
CHKiRet(objUse(net, LM_NET_FILENAME));
CHKiRet(objUse(tcps_sess, LM_TCPSRV_FILENAME));
CHKiRet(objUse(tcpsrv, LM_TCPSRV_FILENAME));
/* register config file handlers */
CHKiRet(omsdRegCFSLineHdlr((uchar *)"inputtcpserverrun", 0, eCmdHdlrGetWord,
addTCPListener, NULL, STD_LOADABLE_MODULE_ID));
CHKiRet(omsdRegCFSLineHdlr((uchar *)"inputtcpmaxsessions", 0, eCmdHdlrInt,
NULL, &iTCPSessMax, STD_LOADABLE_MODULE_ID));
CHKiRet(omsdRegCFSLineHdlr((uchar *)"resetconfigvariables", 1, eCmdHdlrCustomHandler,
resetConfigVariables, NULL, STD_LOADABLE_MODULE_ID));
ENDmodInit
/* vim:set ai:
*/
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