path: root/tcpsrv.c

/* tcpsrv.c
 *
 * Common code for plain TCP based servers. This is currently being
 * utilized by imtcp and imgssapi. I suspect that when we implement
 * SSL/TLS, that module could also use tcpsrv.
 *
 * There are actually two classes within the tcpserver code: one is
 * the tcpsrv itself, the other one is its sessions. This is a helper
 * class to tcpsrv.
 *
 * The common code here calls upon specific functionality by using
 * callbacks. The specialised input modules need to set the proper
 * callbacks before the code is run. The tcpsrv then calls back
 * into the specific input modules at the appropriate time.
 *
 * NOTE: read comments in module-template.h to understand how this file
 *       works!
 *
 * File begun on 2007-12-21 by RGerhards (extracted from syslogd.c)
 *
 * Copyright 2007, 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 <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 "dirty.h"
#include "cfsysline.h"
#include "module-template.h"
#include "net.h"
#include "srUtils.h"
#include "conf.h"
#include "tcpsrv.h"
#include "obj.h"
#include "glbl.h"
#include "netstrms.h"
#include "netstrm.h"
#include "nssel.h"
#include "errmsg.h"

MODULE_TYPE_LIB

/* defines */
#define TCPSESS_MAX_DEFAULT 200 /* default for nbr of tcp sessions if no number is given */
#define TCPLSTN_MAX_DEFAULT 20 /* default for nbr of listeners */

/* static data */
DEFobjStaticHelpers
DEFobjCurrIf(conf)
DEFobjCurrIf(glbl)
DEFobjCurrIf(tcps_sess)
DEFobjCurrIf(errmsg)
DEFobjCurrIf(net)
DEFobjCurrIf(netstrms)
DEFobjCurrIf(netstrm)
DEFobjCurrIf(nssel)


/* configure TCP listener settings. This is called during command
 * line parsing. The argument following -t is supplied as an argument.
 * The format of this argument is
 * "<port-to-use>, <nbr-of-sessions>"
 * Typically, there is no whitespace between port and session number.
 * (but it may be...).
 * NOTE: you can not use dbgprintf() in here - the dbgprintf() system is
 * not yet initilized when this function is called.
 * rgerhards, 2007-06-21
 * The port in cOptarg is handed over to us - the caller MUST NOT free it!
 * rgerhards, 2008-03-20
 */
static void
configureTCPListen(tcpsrv_t *pThis, char *cOptarg)
{
	register int i;
	register char *pArg = cOptarg;

	assert(cOptarg != NULL);
	ISOBJ_TYPE_assert(pThis, tcpsrv);

	/* extract port */
	i = 0;
	while(isdigit((int) *pArg)) {
		i = i * 10 + *pArg++ - '0';
	}

	if(pThis->TCPLstnPort != NULL) {
		free(pThis->TCPLstnPort);
		pThis->TCPLstnPort = NULL;
	}
		
	if( i >= 0 && i <= 65535) {
		pThis->TCPLstnPort = cOptarg;
	} else {
		errmsg.LogError(NO_ERRCODE, "Invalid TCP listen port %s - changed to 514.\n", cOptarg);
	}
}


/* Initialize the session table
 * returns 0 if OK, somewhat else otherwise
 */
static rsRetVal
TCPSessTblInit(tcpsrv_t *pThis)
{
	DEFiRet;

	ISOBJ_TYPE_assert(pThis, tcpsrv);
	assert(pThis->pSessions == NULL);

	dbgprintf("Allocating buffer for %d TCP sessions.\n", pThis->iSessMax);
	if((pThis->pSessions = (tcps_sess_t **) calloc(pThis->iSessMax, sizeof(tcps_sess_t *))) == NULL) {
		dbgprintf("Error: TCPSessInit() could not alloc memory for TCP session table.\n");
		ABORT_FINALIZE(RS_RET_OUT_OF_MEMORY);
	}

finalize_it:
	RETiRet;
}


/* find a free spot in the session table. If the table
 * is full, -1 is returned, else the index of the free
 * entry (0 or higher).
 */
static int
TCPSessTblFindFreeSpot(tcpsrv_t *pThis)
{
	register int i;

	ISOBJ_TYPE_assert(pThis, tcpsrv);

	for(i = 0 ; i < pThis->iSessMax ; ++i) {
		if(pThis->pSessions[i] == NULL)
			break;
	}

	return((i < pThis->iSessMax) ? i : -1);
}


/* Get the next session index. Free session tables entries are
 * skipped. This function is provided the index of the last
 * session entry, or -1 if no previous entry was obtained. It
 * returns the index of the next session or -1, if there is no
 * further entry in the table. Please note that the initial call
 * might as well return -1, if there is no session at all in the
 * session table.
 */
static int
TCPSessGetNxtSess(tcpsrv_t *pThis, int iCurr)
{
	register int i;

	BEGINfunc
	ISOBJ_TYPE_assert(pThis, tcpsrv);
	assert(pThis->pSessions != NULL);
	for(i = iCurr + 1 ; i < pThis->iSessMax ; ++i) {
		if(pThis->pSessions[i] != NULL)
			break;
	}

	ENDfunc
	return((i < pThis->iSessMax) ? i : -1);
}


/* De-Initialize TCP listner sockets.
 * This function deinitializes everything, including freeing the
 * session table. No TCP listen receive operations are permitted
 * unless the subsystem is reinitialized.
 * rgerhards, 2007-06-21
 */
static void deinit_tcp_listener(tcpsrv_t *pThis)
{
	int i;

	ISOBJ_TYPE_assert(pThis, tcpsrv);

	if(pThis->pSessions != NULL) {
		/* close all TCP connections! */
		i = TCPSessGetNxtSess(pThis, -1);
		while(i != -1) {
			tcps_sess.Destruct(&pThis->pSessions[i]);
			/* now get next... */
			i = TCPSessGetNxtSess(pThis, i);
		}
		
		/* we are done with the session table - so get rid of it...  */
		free(pThis->pSessions);
		pThis->pSessions = NULL; /* just to make sure... */
	}

	if(pThis->TCPLstnPort != NULL)
		free(pThis->TCPLstnPort);

	/* finally close our listen streams */
	for(i = 0 ; i < pThis->iLstnMax ; ++i) {
		netstrm.Destruct(pThis->ppLstn + i);
	}
}


/* add a listen socket to our listen socket array. This is a callback
 * invoked from the netstrm class. -- rgerhards, 2008-04-23
 */
static rsRetVal
addTcpLstn(void *pUsr, netstrm_t *pLstn)
{
	tcpsrv_t *pThis = (tcpsrv_t*) pUsr;
	DEFiRet;

	ISOBJ_TYPE_assert(pThis, tcpsrv);
	ISOBJ_TYPE_assert(pLstn, netstrm);

	if(pThis->iLstnMax >= TCPLSTN_MAX_DEFAULT)
		ABORT_FINALIZE(RS_RET_MAX_LSTN_REACHED);

	pThis->ppLstn[pThis->iLstnMax] = pLstn;
	++pThis->iLstnMax;

finalize_it:
	RETiRet;
}


/* Initialize TCP sockets (for listener) and listens on them */
static rsRetVal
create_tcp_socket(tcpsrv_t *pThis)
{
	DEFiRet;
	uchar *TCPLstnPort;

	ISOBJ_TYPE_assert(pThis, tcpsrv);

	if(!strcmp((char*)pThis->TCPLstnPort, "0"))
		TCPLstnPort = (uchar*)"514";
		// TODO: we need to enable the caller to set a port (based on who is
		// using this, 514 may be totally unsuitable... --- rgerhards, 2008-04-22
		/* use default - we can not do service db update, because there is
		 * no IANA-assignment for syslog/tcp. In the long term, we might
		 * re-use RFC 3195 port of 601, but that would probably break to
		 * many existing configurations.
		 * rgerhards, 2007-06-28
		 */
	else
		TCPLstnPort = (uchar*)pThis->TCPLstnPort;

	/* TODO: add capability to specify local listen address! */
	CHKiRet(netstrm.LstnInit(pThis->pNS, (void*)pThis, addTcpLstn, TCPLstnPort, NULL, pThis->iSessMax));

	/* OK, we had success. Now it is also time to
	 * initialize our connections
	 */
	if(TCPSessTblInit(pThis) != 0) {
		/* OK, we are in some trouble - we could not initialize the
		 * session table, so we can not continue. We need to free all
		 * we have assigned so far, because we can not really use it...
		 */
		errmsg.LogError(NO_ERRCODE, "Could not initialize TCP session table, suspending TCP message reception.");
		ABORT_FINALIZE(RS_RET_ERR);
	}

finalize_it:
	RETiRet;
}


/* Accept new TCP connection; make entry in session table. If there
 * is no more space left in the connection table, the new TCP
 * connection is immediately dropped.
 * ppSess has a pointer to the newly created session, if it succeds.
 * If it does not succeed, no session is created and ppSess is
 * undefined. If the user has provided an OnSessAccept Callback,
 * this one is executed immediately after creation of the 
 * session object, so that it can do its own initialization.
 * rgerhards, 2008-03-02
 */
static rsRetVal
SessAccept(tcpsrv_t *pThis, tcps_sess_t **ppSess, netstrm_t *pStrm)
{
	DEFiRet;
	tcps_sess_t *pSess;
	netstrm_t *pNewStrm = NULL;
	int iSess = -1;
	struct sockaddr_storage addr;
	uchar *fromHostFQDN = NULL;
	uchar *fromHostIP = NULL;

	ISOBJ_TYPE_assert(pThis, tcpsrv);

	CHKiRet(netstrm.AcceptConnReq(pStrm, &pNewStrm));

	/* Add to session list */
	iSess = TCPSessTblFindFreeSpot(pThis);
	if(iSess == -1) {
		errno = 0;
		errmsg.LogError(NO_ERRCODE, "too many tcp sessions - dropping incoming request");
		ABORT_FINALIZE(RS_RET_MAX_SESS_REACHED);
	} else {
		/* we found a free spot and can construct our session object */
		CHKiRet(tcps_sess.Construct(&pSess));
		CHKiRet(tcps_sess.SetTcpsrv(pSess, pThis));
	}

	/* OK, we have a "good" index... */
	/* get the host name */
	CHKiRet(netstrm.GetRemoteHName(pNewStrm, &fromHostFQDN));
	CHKiRet(netstrm.GetRemoteIP(pNewStrm, &fromHostIP));
	/* TODO: check if we need to strip the domain name here -- rgerhards, 2008-04-24 */

	/* Here we check if a host is permitted to send us messages. If it isn't, we do not further
	 * process the message but log a warning (if we are configured to do this).
	 * rgerhards, 2005-09-26
	 */
	if(!pThis->pIsPermittedHost((struct sockaddr*) &addr, (char*) fromHostFQDN, pThis->pUsr, pSess->pUsr)) {
		dbgprintf("%s is not an allowed sender\n", fromHostFQDN);
		if(glbl.GetOption_DisallowWarning()) {
			errno = 0;
			errmsg.LogError(NO_ERRCODE, "TCP message from disallowed sender %s discarded", fromHostFQDN);
		}
		ABORT_FINALIZE(RS_RET_HOST_NOT_PERMITTED);
	}

	/* OK, we have an allowed sender, so let's continue, what
	 * means we can finally fill in the session object.
	 */
	CHKiRet(tcps_sess.SetHost(pSess, fromHostFQDN));
	CHKiRet(tcps_sess.SetHostIP(pSess, fromHostIP));
	CHKiRet(tcps_sess.SetStrm(pSess, pNewStrm));
	pNewStrm = NULL; /* prevent it from being freed in error handler, now done in tcps_sess! */
	CHKiRet(tcps_sess.SetMsgIdx(pSess, 0));
	CHKiRet(tcps_sess.ConstructFinalize(pSess));

	/* check if we need to call our callback */
	if(pThis->pOnSessAccept != NULL) {
		CHKiRet(pThis->pOnSessAccept(pThis, pSess));
	}

	*ppSess = pSess;
	pThis->pSessions[iSess] = pSess;

finalize_it:
	if(iRet != RS_RET_OK) {
		if(iSess != -1) {
			if(pThis->pSessions[iSess] != NULL)
				tcps_sess.Destruct(&pThis->pSessions[iSess]);
		}
		iSess = -1; // TODO: change this to be fully iRet compliant ;)
		if(pNewStrm != NULL)
			netstrm.Destruct(&pNewStrm);
	}

	RETiRet;
}


static void
RunCancelCleanup(void *arg)
{
	nssel_t **ppSel = (nssel_t**) arg;

	if(*ppSel != NULL)
		nssel.Destruct(ppSel);
}
/* This function is called to gather input. */
static rsRetVal
Run(tcpsrv_t *pThis)
{
	DEFiRet;
	int nfds;
	int i;
	int iTCPSess;
	int bIsReady;
	tcps_sess_t *pNewSess;
	nssel_t *pSel;
	int state;

	ISOBJ_TYPE_assert(pThis, tcpsrv);

	/* this is an endless loop - it is terminated by the framework canelling
	 * this thread. Thus, we also need to instantiate a cancel cleanup handler
	 * to prevent us from leaking anything. -- rgerharsd, 20080-04-24
	 */
	pthread_cleanup_push(RunCancelCleanup, (void*) &pSel);
	while(1) {
		CHKiRet(nssel.Construct(&pSel));
		// TODO: set driver
		CHKiRet(nssel.ConstructFinalize(pSel));

		/* Add the TCP listen sockets to the list of read descriptors. */
		for(i = 0 ; i < pThis->iLstnMax ; ++i) {
			CHKiRet(nssel.Add(pSel, pThis->ppLstn[i], NSDSEL_RD));
		}

		/* do the sessions */
		iTCPSess = TCPSessGetNxtSess(pThis, -1);
		while(iTCPSess != -1) {
			/* TODO: access to pNsd is NOT really CLEAN, use method... */
			CHKiRet(nssel.Add(pSel, pThis->pSessions[iTCPSess]->pStrm, NSDSEL_RD));
			/* now get next... */
			iTCPSess = TCPSessGetNxtSess(pThis, iTCPSess);
		}

		/* wait for io to become ready */
		CHKiRet(nssel.Wait(pSel, &nfds));

		for(i = 0 ; i < pThis->iLstnMax ; ++i) {
			CHKiRet(nssel.IsReady(pSel, pThis->ppLstn[i], NSDSEL_RD, &bIsReady, &nfds));
			if(bIsReady) {
				dbgprintf("New connect on NSD %p.\n", pThis->ppLstn[i]);
				SessAccept(pThis, &pNewSess, pThis->ppLstn[i]);
				--nfds; /* indicate we have processed one */
			}
		}

		/* now check the sessions */
		iTCPSess = TCPSessGetNxtSess(pThis, -1);
		while(nfds && iTCPSess != -1) {
			CHKiRet(nssel.IsReady(pSel, pThis->pSessions[iTCPSess]->pStrm, NSDSEL_RD, &bIsReady, &nfds));
			if(bIsReady) {
				char buf[MAXLINE];
				dbgprintf("netstream %p with new data\n", pThis->pSessions[iTCPSess]->pStrm);

				/* Receive message */
				state = pThis->pRcvData(pThis->pSessions[iTCPSess], buf, sizeof(buf));
				if(state == 0) {
					pThis->pOnRegularClose(pThis->pSessions[iTCPSess]);
					tcps_sess.Destruct(&pThis->pSessions[iTCPSess]);
				} else if(state == -1) {
					errno = 0;
					errmsg.LogError(NO_ERRCODE, "netstream session %p will be closed due to error\n",
							pThis->pSessions[iTCPSess]->pStrm);
					pThis->pOnErrClose(pThis->pSessions[iTCPSess]);
					tcps_sess.Destruct(&pThis->pSessions[iTCPSess]);
				} else {
					/* valid data received, process it! */
					if(tcps_sess.DataRcvd(pThis->pSessions[iTCPSess], buf, state) != RS_RET_OK) {
						/* in this case, something went awfully wrong.
						 * We are instructed to terminate the session.
						 */
						errmsg.LogError(NO_ERRCODE, "Tearing down TCP Session %d - see "
							    "previous messages for reason(s)\n", iTCPSess);
						pThis->pOnErrClose(pThis->pSessions[iTCPSess]);
						tcps_sess.Destruct(&pThis->pSessions[iTCPSess]);
					}
				}
				--nfds; /* indicate we have processed one */
			}
			iTCPSess = TCPSessGetNxtSess(pThis, iTCPSess);
		}
		CHKiRet(nssel.Destruct(&pSel));
finalize_it: /* this is a very special case - this time only we do not exit the function,
	      * because that would not help us either. So we simply retry it. Let's see
	      * if that actually is a better idea. Exiting the loop wasn't we always
	      * crashed, which made sense (the rest of the engine was not prepared for
	      * that) -- rgerhards, 2008-05-19
	      */
		/*EMPTY*/;
	}

	/* note that this point is usually not reached */
	pthread_cleanup_pop(0); /* remove cleanup handler */

	RETiRet;
}


/* Standard-Constructor */
BEGINobjConstruct(tcpsrv) /* be sure to specify the object type also in END macro! */
	pThis->iSessMax = TCPSESS_MAX_DEFAULT; /* TODO: useful default ;) */
ENDobjConstruct(tcpsrv)


/* ConstructionFinalizer */
static rsRetVal
tcpsrvConstructFinalize(tcpsrv_t *pThis)
{
	DEFiRet;
	ISOBJ_TYPE_assert(pThis, tcpsrv);

	/* prepare network stream subsystem */
	CHKiRet(netstrms.Construct(&pThis->pNS));
	CHKiRet(netstrms.SetDrvrMode(pThis->pNS, pThis->iDrvrMode));
	if(pThis->pszDrvrAuthMode != NULL)
		CHKiRet(netstrms.SetDrvrAuthMode(pThis->pNS, pThis->pszDrvrAuthMode));
	if(pThis->pPermPeers != NULL)
		CHKiRet(netstrms.SetDrvrPermPeers(pThis->pNS, pThis->pPermPeers));
	// TODO: set driver!
	CHKiRet(netstrms.ConstructFinalize(pThis->pNS));

	/* set up listeners */
	CHKmalloc(pThis->ppLstn = calloc(TCPLSTN_MAX_DEFAULT, sizeof(netstrm_t*)));
	iRet = pThis->OpenLstnSocks(pThis);

finalize_it:
	if(iRet != RS_RET_OK) {
		if(pThis->pNS != NULL)
			netstrms.Destruct(&pThis->pNS);
	}
	RETiRet;
}


/* destructor for the tcpsrv object */
BEGINobjDestruct(tcpsrv) /* be sure to specify the object type also in END and CODESTART macros! */
CODESTARTobjDestruct(tcpsrv)
	if(pThis->OnDestruct != NULL)
		pThis->OnDestruct(pThis->pUsr);

	deinit_tcp_listener(pThis);

	if(pThis->pNS != NULL)
		netstrms.Destruct(&pThis->pNS);
	if(pThis->pszDrvrAuthMode != NULL)
		free(pThis->pszDrvrAuthMode);
	if(pThis->ppLstn != NULL)
		free(pThis->ppLstn);
ENDobjDestruct(tcpsrv)


/* debugprint for the tcpsrv object */
BEGINobjDebugPrint(tcpsrv) /* be sure to specify the object type also in END and CODESTART macros! */
CODESTARTobjDebugPrint(tcpsrv)
ENDobjDebugPrint(tcpsrv)

/* set functions */
static rsRetVal
SetCBIsPermittedHost(tcpsrv_t *pThis, int (*pCB)(struct sockaddr *addr, char *fromHostFQDN, void*, void*))
{
	DEFiRet;
	pThis->pIsPermittedHost = pCB;
	RETiRet;
}

static rsRetVal
SetCBRcvData(tcpsrv_t *pThis, int (*pRcvData)(tcps_sess_t*, char*, size_t))
{
	DEFiRet;
	pThis->pRcvData = pRcvData;
	RETiRet;
}

static rsRetVal
SetCBOnListenDeinit(tcpsrv_t *pThis, int (*pCB)(void*))
{
	DEFiRet;
	pThis->pOnListenDeinit = pCB;
	RETiRet;
}

static rsRetVal
SetCBOnSessAccept(tcpsrv_t *pThis, rsRetVal (*pCB)(tcpsrv_t*, tcps_sess_t*))
{
	DEFiRet;
	pThis->pOnSessAccept = pCB;
	RETiRet;
}

static rsRetVal
SetCBOnDestruct(tcpsrv_t *pThis, rsRetVal (*pCB)(void*))
{
	DEFiRet;
	pThis->OnDestruct = pCB;
	RETiRet;
}

static rsRetVal
SetCBOnSessConstructFinalize(tcpsrv_t *pThis, rsRetVal (*pCB)(void*))
{
	DEFiRet;
	pThis->OnSessConstructFinalize = pCB;
	RETiRet;
}

static rsRetVal
SetCBOnSessDestruct(tcpsrv_t *pThis, rsRetVal (*pCB)(void*))
{
	DEFiRet;
	pThis->pOnSessDestruct = pCB;
	RETiRet;
}

static rsRetVal
SetCBOnRegularClose(tcpsrv_t *pThis, rsRetVal (*pCB)(tcps_sess_t*))
{
	DEFiRet;
	pThis->pOnRegularClose = pCB;
	RETiRet;
}

static rsRetVal
SetCBOnErrClose(tcpsrv_t *pThis, rsRetVal (*pCB)(tcps_sess_t*))
{
	DEFiRet;
	pThis->pOnErrClose = pCB;
	RETiRet;
}

static rsRetVal
SetCBOpenLstnSocks(tcpsrv_t *pThis, rsRetVal (*pCB)(tcpsrv_t*))
{
	DEFiRet;
	pThis->OpenLstnSocks = pCB;
	RETiRet;
}

static rsRetVal
SetUsrP(tcpsrv_t *pThis, void *pUsr)
{
	DEFiRet;
	pThis->pUsr = pUsr;
	RETiRet;
}


/* here follows a number of methods that shuffle authentication settings down
 * to the drivers. Drivers not supporting these settings may return an error
 * state.
 * -------------------------------------------------------------------------- */   

/* set the driver mode -- rgerhards, 2008-04-30 */
static rsRetVal
SetDrvrMode(tcpsrv_t *pThis, int iMode)
{
	DEFiRet;
	ISOBJ_TYPE_assert(pThis, tcpsrv);
	pThis->iDrvrMode = iMode;
	RETiRet;
}


/* set the driver authentication mode -- rgerhards, 2008-05-19 */
static rsRetVal
SetDrvrAuthMode(tcpsrv_t *pThis, uchar *mode)
{
	DEFiRet;
	ISOBJ_TYPE_assert(pThis, tcpsrv);
	CHKmalloc(pThis->pszDrvrAuthMode = (uchar*)strdup((char*)mode));
finalize_it:
	RETiRet;
}


/* set the driver's permitted peers -- rgerhards, 2008-05-19 */
static rsRetVal
SetDrvrPermPeers(tcpsrv_t *pThis, permittedPeers_t *pPermPeers)
{
	DEFiRet;
	ISOBJ_TYPE_assert(pThis, tcpsrv);
	pThis->pPermPeers = pPermPeers;
	RETiRet;
}


/* End of methods to shuffle autentication settings to the driver.;

 * -------------------------------------------------------------------------- */


/* queryInterface function
 * rgerhards, 2008-02-29
 */
BEGINobjQueryInterface(tcpsrv)
CODESTARTobjQueryInterface(tcpsrv)
	if(pIf->ifVersion != tcpsrvCURR_IF_VERSION) { /* check for current version, increment on each change */
		ABORT_FINALIZE(RS_RET_INTERFACE_NOT_SUPPORTED);
	}

	/* ok, we have the right interface, so let's fill it
	 * Please note that we may also do some backwards-compatibility
	 * work here (if we can support an older interface version - that,
	 * of course, also affects the "if" above).
	 */
	pIf->DebugPrint = tcpsrvDebugPrint;
	pIf->Construct = tcpsrvConstruct;
	pIf->ConstructFinalize = tcpsrvConstructFinalize;
	pIf->Destruct = tcpsrvDestruct;

	pIf->SessAccept = SessAccept;
	pIf->configureTCPListen = configureTCPListen;
	pIf->create_tcp_socket = create_tcp_socket;
	pIf->Run = Run;

	pIf->SetUsrP = SetUsrP;
	pIf->SetDrvrMode = SetDrvrMode;
	pIf->SetDrvrAuthMode = SetDrvrAuthMode;
	pIf->SetDrvrPermPeers = SetDrvrPermPeers;
	pIf->SetCBIsPermittedHost = SetCBIsPermittedHost;
	pIf->SetCBOpenLstnSocks = SetCBOpenLstnSocks;
	pIf->SetCBRcvData = SetCBRcvData;
	pIf->SetCBOnListenDeinit = SetCBOnListenDeinit;
	pIf->SetCBOnSessAccept = SetCBOnSessAccept;
	pIf->SetCBOnSessConstructFinalize = SetCBOnSessConstructFinalize;
	pIf->SetCBOnSessDestruct = SetCBOnSessDestruct;
	pIf->SetCBOnDestruct = SetCBOnDestruct;
	pIf->SetCBOnRegularClose = SetCBOnRegularClose;
	pIf->SetCBOnErrClose = SetCBOnErrClose;

finalize_it:
ENDobjQueryInterface(tcpsrv)


/* exit our class
 * rgerhards, 2008-03-10
 */
BEGINObjClassExit(tcpsrv, OBJ_IS_LOADABLE_MODULE) /* CHANGE class also in END MACRO! */
CODESTARTObjClassExit(tcpsrv)
	/* release objects we no longer need */
	objRelease(tcps_sess, DONT_LOAD_LIB);
	objRelease(conf, CORE_COMPONENT);
	objRelease(glbl, CORE_COMPONENT);
	objRelease(errmsg, CORE_COMPONENT);
	objRelease(netstrms, DONT_LOAD_LIB);
	objRelease(nssel, DONT_LOAD_LIB);
	objRelease(netstrm, LM_NETSTRMS_FILENAME);
	objRelease(net, LM_NET_FILENAME);
ENDObjClassExit(tcpsrv)


/* Initialize our class. Must be called as the very first method
 * before anything else is called inside this class.
 * rgerhards, 2008-02-29
 */
BEGINObjClassInit(tcpsrv, 1, OBJ_IS_LOADABLE_MODULE) /* class, version - CHANGE class also in END MACRO! */
	/* request objects we use */
	CHKiRet(objUse(errmsg, CORE_COMPONENT));
	CHKiRet(objUse(net, LM_NET_FILENAME));
	CHKiRet(objUse(netstrms, LM_NETSTRMS_FILENAME));
	CHKiRet(objUse(netstrm, DONT_LOAD_LIB));
	CHKiRet(objUse(nssel, DONT_LOAD_LIB));
	CHKiRet(objUse(tcps_sess, DONT_LOAD_LIB));
	CHKiRet(objUse(conf, CORE_COMPONENT));
	CHKiRet(objUse(glbl, CORE_COMPONENT));

	/* set our own handlers */
	OBJSetMethodHandler(objMethod_DEBUGPRINT, tcpsrvDebugPrint);
	OBJSetMethodHandler(objMethod_CONSTRUCTION_FINALIZER, tcpsrvConstructFinalize);
ENDObjClassInit(tcpsrv)


/* --------------- here now comes the plumbing that makes as a library module --------------- */


BEGINmodExit
CODESTARTmodExit
	/* de-init in reverse order! */
	tcpsrvClassExit();
	tcps_sessClassExit();
ENDmodExit


BEGINqueryEtryPt
CODESTARTqueryEtryPt
CODEqueryEtryPt_STD_LIB_QUERIES
ENDqueryEtryPt


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

	/* Initialize all classes that are in our module - this includes ourselfs */
	CHKiRet(tcps_sessClassInit(pModInfo));
	CHKiRet(tcpsrvClassInit(pModInfo)); /* must be done after tcps_sess, as we use it */
ENDmodInit

/* vim:set ai:
 */