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Diffstat (limited to 'runtime/nsdsel_ptcp.c')
| -rw-r--r-- | runtime/nsdsel_ptcp.c | 216 |
1 files changed, 216 insertions, 0 deletions
diff --git a/runtime/nsdsel_ptcp.c b/runtime/nsdsel_ptcp.c new file mode 100644 index 00000000..67f3c62a --- /dev/null +++ b/runtime/nsdsel_ptcp.c @@ -0,0 +1,216 @@ +/* nsdsel_ptcp.c + * + * An implementation of the nsd select() interface for plain tcp sockets. + * + * Copyright 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 "rsyslog.h" +#include <stdio.h> +#include <stdarg.h> +#include <stdlib.h> +#include <assert.h> +#include <errno.h> +#include <string.h> +#include <signal.h> +#include <ctype.h> +#include <netdb.h> +#include <fnmatch.h> +#include <fcntl.h> +#include <unistd.h> +#include <sys/select.h> + +#include "rsyslog.h" +#include "module-template.h" +#include "obj.h" +#include "errmsg.h" +#include "nsd_ptcp.h" +#include "nsdsel_ptcp.h" + +MODULE_TYPE_LIB + +/* static data */ +DEFobjStaticHelpers +DEFobjCurrIf(errmsg) +DEFobjCurrIf(glbl) + + +/* Standard-Constructor + */ +BEGINobjConstruct(nsdsel_ptcp) /* be sure to specify the object type also in END macro! */ + pThis->maxfds = 0; + FD_ZERO(&pThis->readfds); + FD_ZERO(&pThis->writefds); +ENDobjConstruct(nsdsel_ptcp) + + +/* destructor for the nsdsel_ptcp object */ +BEGINobjDestruct(nsdsel_ptcp) /* be sure to specify the object type also in END and CODESTART macros! */ +CODESTARTobjDestruct(nsdsel_ptcp) +ENDobjDestruct(nsdsel_ptcp) + + +/* Add a socket to the select set */ +static rsRetVal +Add(nsdsel_t *pNsdsel, nsd_t *pNsd, nsdsel_waitOp_t waitOp) +{ + DEFiRet; + nsdsel_ptcp_t *pThis = (nsdsel_ptcp_t*) pNsdsel; + nsd_ptcp_t *pSock = (nsd_ptcp_t*) pNsd; + + ISOBJ_TYPE_assert(pSock, nsd_ptcp); + ISOBJ_TYPE_assert(pThis, nsdsel_ptcp); + + switch(waitOp) { + case NSDSEL_RD: + FD_SET(pSock->sock, &pThis->readfds); + break; + case NSDSEL_WR: + FD_SET(pSock->sock, &pThis->writefds); + break; + case NSDSEL_RDWR: + FD_SET(pSock->sock, &pThis->readfds); + FD_SET(pSock->sock, &pThis->writefds); + break; + } + + if(pSock->sock > pThis->maxfds) + pThis->maxfds = pSock->sock; + + 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; + int i; + nsdsel_ptcp_t *pThis = (nsdsel_ptcp_t*) pNsdsel; + + ISOBJ_TYPE_assert(pThis, nsdsel_ptcp); + assert(piNumReady != NULL); + + if(Debug) { // TODO: debug setting! + // TODO: name in dbgprintf! + dbgprintf("--------<NSDSEL_PTCP> calling select, active fds (max %d): ", pThis->maxfds); + for(i = 0; i <= pThis->maxfds; ++i) + if(FD_ISSET(i, &pThis->readfds) || FD_ISSET(i, &pThis->writefds)) + dbgprintf("%d ", i); + dbgprintf("\n"); + } + + /* now do the select */ + *piNumReady = select(pThis->maxfds+1, &pThis->readfds, &pThis->writefds, NULL, NULL); + + RETiRet; +} + + +/* check if a socket is ready for IO */ +static rsRetVal +IsReady(nsdsel_t *pNsdsel, nsd_t *pNsd, nsdsel_waitOp_t waitOp) +{ + DEFiRet; + nsdsel_ptcp_t *pThis = (nsdsel_ptcp_t*) pNsdsel; + nsd_ptcp_t *pSock = (nsd_ptcp_t*) pNsd; + + ISOBJ_TYPE_assert(pThis, nsdsel_ptcp); + ISOBJ_TYPE_assert(pSock, nsd_ptcp); + RETiRet; +} + + +/* ------------------------------ end support for the select() interface ------------------------------ */ + + +/* queryInterface function */ +BEGINobjQueryInterface(nsdsel_ptcp) +CODESTARTobjQueryInterface(nsdsel_ptcp) + 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_ptcpConstruct; + pIf->Destruct = (rsRetVal(*)(nsdsel_t**)) nsdsel_ptcpDestruct; + pIf->Add = Add; + pIf->Select = Select; + pIf->IsReady = IsReady; +finalize_it: +ENDobjQueryInterface(nsdsel_ptcp) + + +/* exit our class + */ +BEGINObjClassExit(nsdsel_ptcp, OBJ_IS_LOADABLE_MODULE) /* CHANGE class also in END MACRO! */ +CODESTARTObjClassExit(nsdsel_ptcp) + /* release objects we no longer need */ + objRelease(glbl, CORE_COMPONENT); + objRelease(errmsg, CORE_COMPONENT); +ENDObjClassExit(nsdsel_ptcp) + + +/* Initialize the nsdsel_ptcp class. Must be called as the very first method + * before anything else is called inside this class. + * rgerhards, 2008-02-19 + */ +BEGINObjClassInit(nsdsel_ptcp, 1, OBJ_IS_LOADABLE_MODULE) /* class, version */ + /* request objects we use */ + CHKiRet(objUse(errmsg, CORE_COMPONENT)); + CHKiRet(objUse(glbl, CORE_COMPONENT)); + + /* set our own handlers */ +ENDObjClassInit(nsdsel_ptcp) + + +/* --------------- here now comes the plumbing that makes as a library module --------------- */ + + +BEGINmodExit +CODESTARTmodExit + nsdsel_ptcpClassExit(); +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(nsdsel_ptcpClassInit(pModInfo)); /* must be done after tcps_sess, as we use it */ +ENDmodInit +/* vi:set ai: + */ |