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/* nsdsel_gtls.c
*
* An implementation of the nsd select() interface for GnuTLS.
*
* Copyright (C) 2008 Rainer Gerhards and Adiscon GmbH.
*
* This file is part of the rsyslog runtime library.
*
* The rsyslog runtime library is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* The rsyslog runtime library 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with the rsyslog runtime library. If not, see <http://www.gnu.org/licenses/>.
*
* A copy of the GPL can be found in the file "COPYING" in this distribution.
* A copy of the LGPL can be found in the file "COPYING.LESSER" in this distribution.
*/
#include "config.h"
#include <stdlib.h>
#include <assert.h>
#include <errno.h>
#include <string.h>
#include <sys/select.h>
#include <gnutls/gnutls.h>
#include "rsyslog.h"
#include "module-template.h"
#include "obj.h"
#include "errmsg.h"
#include "nsd.h"
#include "nsd_gtls.h"
#include "nsd_ptcp.h"
#include "nsdsel_ptcp.h"
#include "nsdsel_gtls.h"
/* static data */
DEFobjStaticHelpers
DEFobjCurrIf(errmsg)
DEFobjCurrIf(glbl)
DEFobjCurrIf(nsdsel_ptcp)
/* Standard-Constructor
*/
BEGINobjConstruct(nsdsel_gtls) /* be sure to specify the object type also in END macro! */
iRet = nsdsel_ptcp.Construct(&pThis->pTcp);
ENDobjConstruct(nsdsel_gtls)
/* destructor for the nsdsel_gtls object */
BEGINobjDestruct(nsdsel_gtls) /* be sure to specify the object type also in END and CODESTART macros! */
CODESTARTobjDestruct(nsdsel_gtls)
if(pThis->pTcp != NULL)
nsdsel_ptcp.Destruct(&pThis->pTcp);
ENDobjDestruct(nsdsel_gtls)
/* Add a socket to the select set */
static rsRetVal
Add(nsdsel_t *pNsdsel, nsd_t *pNsd, nsdsel_waitOp_t waitOp)
{
DEFiRet;
nsdsel_gtls_t *pThis = (nsdsel_gtls_t*) pNsdsel;
nsd_gtls_t *pNsdGTLS = (nsd_gtls_t*) pNsd;
ISOBJ_TYPE_assert(pThis, nsdsel_gtls);
ISOBJ_TYPE_assert(pNsdGTLS, nsd_gtls);
if(pNsdGTLS->iMode == 1) {
if(pNsdGTLS->rtryCall != gtlsRtry_None) {
if(gnutls_record_get_direction(pNsdGTLS->sess) == 0) {
CHKiRet(nsdsel_ptcp.Add(pThis->pTcp, pNsdGTLS->pTcp, NSDSEL_RD));
} else {
CHKiRet(nsdsel_ptcp.Add(pThis->pTcp, pNsdGTLS->pTcp, NSDSEL_WR));
}
FINALIZE;
}
}
/* if we reach this point, we need no special handling */
CHKiRet(nsdsel_ptcp.Add(pThis->pTcp, pNsdGTLS->pTcp, waitOp));
finalize_it:
RETiRet;
}
/* perform the select() piNumReady returns how many descriptors are ready for IO
* TODO: add timeout!
*/
static rsRetVal
Select(nsdsel_t *pNsdsel, int *piNumReady)
{
DEFiRet;
nsdsel_gtls_t *pThis = (nsdsel_gtls_t*) pNsdsel;
ISOBJ_TYPE_assert(pThis, nsdsel_gtls);
iRet = nsdsel_ptcp.Select(pThis->pTcp, piNumReady);
RETiRet;
}
/* retry an interrupted GTLS operation
* rgerhards, 2008-04-30
*/
static rsRetVal
doRetry(nsd_gtls_t *pNsd)
{
DEFiRet;
int gnuRet;
dbgprintf("GnuTLS requested retry of %d operation - executing\n", pNsd->rtryCall);
/* We follow a common scheme here: first, we do the systen call and
* then we check the result. So far, the result is checked after the
* switch, because the result check is the same for all calls. Note that
* this may change once we deal with the read and write calls (but
* probably this becomes an issue only when we begin to work on TLS
* for relp). -- rgerhards, 2008-04-30
*/
switch(pNsd->rtryCall) {
case gtlsRtry_handshake:
gnuRet = gnutls_handshake(pNsd->sess);
if(gnuRet == 0) {
pNsd->rtryCall = gtlsRtry_None; /* we are done */
/* we got a handshake, now check authorization */
CHKiRet(gtlsChkPeerAuth(pNsd));
}
break;
default:
assert(0); /* this shall not happen! */
dbgprintf("ERROR: pNsd->rtryCall invalid in nsdsel_gtls.c:%d\n", __LINE__);
gnuRet = 0; /* if it happens, we have at least a defined behaviour... ;) */
break;
}
if(gnuRet == 0) {
pNsd->rtryCall = gtlsRtry_None; /* we are done */
} else if(gnuRet != GNUTLS_E_AGAIN && gnuRet != GNUTLS_E_INTERRUPTED) {
uchar *pErr = gtlsStrerror(gnuRet);
dbgprintf("unexpected GnuTLS error %d in %s:%d: %s\n", gnuRet, __FILE__, __LINE__, pErr);
free(pErr);
pNsd->rtryCall = gtlsRtry_None; /* we are also done... ;) */
ABORT_FINALIZE(RS_RET_GNUTLS_ERR);
}
/* if we are interrupted once again (else case), we do not need to
* change our status because we are already setup for retries.
*/
finalize_it:
if(iRet != RS_RET_OK)
pNsd->bAbortConn = 1; /* request abort */
RETiRet;
}
/* check if a socket is ready for IO */
static rsRetVal
IsReady(nsdsel_t *pNsdsel, nsd_t *pNsd, nsdsel_waitOp_t waitOp, int *pbIsReady)
{
DEFiRet;
nsdsel_gtls_t *pThis = (nsdsel_gtls_t*) pNsdsel;
nsd_gtls_t *pNsdGTLS = (nsd_gtls_t*) pNsd;
ISOBJ_TYPE_assert(pThis, nsdsel_gtls);
ISOBJ_TYPE_assert(pNsdGTLS, nsd_gtls);
if(pNsdGTLS->iMode == 1) {
if(pNsdGTLS->rtryCall != gtlsRtry_None) {
CHKiRet(doRetry(pNsdGTLS));
/* we used this up for our own internal processing, so the socket
* is not ready from the upper layer point of view.
*/
*pbIsReady = 0;
FINALIZE;
}
}
CHKiRet(nsdsel_ptcp.IsReady(pThis->pTcp, pNsdGTLS->pTcp, waitOp, pbIsReady));
finalize_it:
RETiRet;
}
/* ------------------------------ end support for the select() interface ------------------------------ */
/* queryInterface function */
BEGINobjQueryInterface(nsdsel_gtls)
CODESTARTobjQueryInterface(nsdsel_gtls)
if(pIf->ifVersion != nsdCURR_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->Construct = (rsRetVal(*)(nsdsel_t**)) nsdsel_gtlsConstruct;
pIf->Destruct = (rsRetVal(*)(nsdsel_t**)) nsdsel_gtlsDestruct;
pIf->Add = Add;
pIf->Select = Select;
pIf->IsReady = IsReady;
finalize_it:
ENDobjQueryInterface(nsdsel_gtls)
/* exit our class
*/
BEGINObjClassExit(nsdsel_gtls, OBJ_IS_CORE_MODULE) /* CHANGE class also in END MACRO! */
CODESTARTObjClassExit(nsdsel_gtls)
/* release objects we no longer need */
objRelease(glbl, CORE_COMPONENT);
objRelease(errmsg, CORE_COMPONENT);
objRelease(nsdsel_ptcp, LM_NSD_PTCP_FILENAME);
ENDObjClassExit(nsdsel_gtls)
/* Initialize the nsdsel_gtls class. Must be called as the very first method
* before anything else is called inside this class.
* rgerhards, 2008-02-19
*/
BEGINObjClassInit(nsdsel_gtls, 1, OBJ_IS_CORE_MODULE) /* class, version */
/* request objects we use */
CHKiRet(objUse(errmsg, CORE_COMPONENT));
CHKiRet(objUse(glbl, CORE_COMPONENT));
CHKiRet(objUse(nsdsel_ptcp, LM_NSD_PTCP_FILENAME));
/* set our own handlers */
ENDObjClassInit(nsdsel_gtls)
/* vi:set ai:
*/
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