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/**
 * \brief This is the main file of the rsyslogd daemon.
 *
 * Please visit the rsyslog project at
 *
 * http://www.rsyslog.com
 *
 * to learn more about it and discuss any questions you may have.
 *
 * rsyslog had initially been forked from the sysklogd project.
 * I would like to express my thanks to the developers of the sysklogd
 * package - without it, I would have had a much harder start...
 *
 * Please note that while rsyslog started from the sysklogd code base,
 * it nowadays has almost nothing left in common with it. Allmost all
 * parts of the code have been rewritten.
 *
 * This Project was intiated and is maintained by
 * Rainer Gerhards <rgerhards@hq.adiscon.com>.
 *
 * For further information, please see http://www.rsyslog.com
 *
 * rsyslog - An Enhanced syslogd Replacement.
 * Copyright 2003-2011 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 "rsyslog.h"

#define DEFUPRI		(LOG_USER|LOG_NOTICE)
#define TIMERINTVL	30		/* interval for checking flush, mark */

#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <stddef.h>
#include <ctype.h>
#include <limits.h>
#define GNU_SOURCE
#include <string.h>
#include <stdarg.h>
#include <time.h>
#include <assert.h>

#ifdef OS_SOLARIS
#	include <errno.h>
#	include <fcntl.h>
#	include <stropts.h>
#	include <sys/termios.h>
#	include <sys/types.h>
#else
#	include <libgen.h>
#	include <sys/errno.h>
#endif

#include <sys/ioctl.h>
#include <sys/wait.h>
#include <sys/file.h>
#include <sys/resource.h>
#include <grp.h>

#if HAVE_SYS_TIMESPEC_H
# include <sys/timespec.h>
#endif

#if HAVE_SYS_STAT_H
#	include <sys/stat.h>
#endif

#include <signal.h>

#if HAVE_PATHS_H
#include <paths.h>
#endif

#ifdef USE_NETZIP
#include <zlib.h>
#endif

#include <netdb.h>

#include "pidfile.h"
#include "srUtils.h"
#include "stringbuf.h"
#include "syslogd-types.h"
#include "template.h"
#include "outchannel.h"
#include "syslogd.h"

#include "msg.h"
#include "modules.h"
#include "action.h"
#include "iminternal.h"
#include "cfsysline.h"
#include "threads.h"
#include "wti.h"
#include "queue.h"
#include "stream.h"
#include "conf.h"
#include "errmsg.h"
#include "datetime.h"
#include "parser.h"
#include "batch.h"
#include "unicode-helper.h"
#include "ruleset.h"
#include "rule.h"
#include "net.h"
#include "vm.h"
#include "prop.h"
#include "rsconf.h"
#include "dnscache.h"
#include "sd-daemon.h"

/* definitions for objects we access */
DEFobjCurrIf(obj)
DEFobjCurrIf(glbl)
DEFobjCurrIf(datetime) /* TODO: make go away! */
DEFobjCurrIf(conf)
DEFobjCurrIf(expr)
DEFobjCurrIf(module)
DEFobjCurrIf(errmsg)
DEFobjCurrIf(rule)
DEFobjCurrIf(ruleset)
DEFobjCurrIf(prop)
DEFobjCurrIf(parser)
DEFobjCurrIf(rsconf)
DEFobjCurrIf(net) /* TODO: make go away! */


/* forward definitions */
static rsRetVal GlobalClassExit(void);


#ifndef _PATH_LOGCONF 
#define _PATH_LOGCONF	"/etc/rsyslog.conf"
#endif

#ifndef _PATH_MODDIR
#       if defined(__FreeBSD__)
#               define _PATH_MODDIR     "/usr/local/lib/rsyslog/"
#       else
#               define _PATH_MODDIR     "/lib/rsyslog/"
#       endif
#endif

#if defined(SYSLOGD_PIDNAME)
#	undef _PATH_LOGPID
#	if defined(FSSTND)
#		ifdef OS_BSD
#			define _PATH_VARRUN "/var/run/"
#		endif
#		if defined(__sun) || defined(__hpux)
#			define _PATH_VARRUN "/var/run/"
#		endif
#		define _PATH_LOGPID _PATH_VARRUN SYSLOGD_PIDNAME
#	else
#		define _PATH_LOGPID "/etc/" SYSLOGD_PIDNAME
#	endif
#else
#	ifndef _PATH_LOGPID
#		if defined(__sun) || defined(__hpux)
#			define _PATH_VARRUN "/var/run/"
#		endif
#		if defined(FSSTND)
#			define _PATH_LOGPID _PATH_VARRUN "rsyslogd.pid"
#		else
#			define _PATH_LOGPID "/etc/rsyslogd.pid"
#		endif
#	endif
#endif

#ifndef _PATH_TTY
#	define _PATH_TTY	"/dev/tty"
#endif

rsconf_t *ourConf;				/* our config object */

static prop_t *pInternalInputName = NULL;	/* there is only one global inputName for all internally-generated messages */
static prop_t *pLocalHostIP = NULL;		/* there is only one global IP for all internally-generated messages */
static uchar	*ConfFile = (uchar*) _PATH_LOGCONF; /* read-only after startup */
static char	*PidFile = _PATH_LOGPID; /* read-only after startup */

static pid_t myPid;	/* our pid for use in self-generated messages, e.g. on startup */
/* mypid is read-only after the initial fork() */
static int bHadHUP = 0; /* did we have a HUP? */

static int bFinished = 0;	/* used by termination signal handler, read-only except there
				 * is either 0 or the number of the signal that requested the
 				 * termination.
				 */
int iConfigVerify = 0;	/* is this just a config verify run? */

/* Intervals at which we flush out "message repeated" messages,
 * in seconds after previous message is logged.  After each flush,
 * we move to the next interval until we reach the largest.
 * TODO: this shall go into action object! -- rgerhards, 2008-01-29
 */
int	repeatinterval[2] = { 30, 60 };	/* # of secs before flush */

#define LIST_DELIMITER	':'		/* delimiter between two hosts */

static pid_t ppid; /* This is a quick and dirty hack used for spliting main/startup thread */

typedef struct legacyOptsLL_s {
	uchar *line;
	struct legacyOptsLL_s *next;
} legacyOptsLL_t;
legacyOptsLL_t *pLegacyOptsLL = NULL;

/* global variables for config file state */
int	iCompatibilityMode = 0;		/* version we should be compatible with; 0 means sysklogd. It is
					   the default, so if no -c<n> option is given, we make ourselvs
					   as compatible to sysklogd as possible. */
/* end global config file state variables */

int	MarkInterval = 20 * 60;	/* interval between marks in seconds - read-only after startup */
int      send_to_all = 0;        /* send message to all IPv4/IPv6 addresses */
static int	NoFork = 0; 	/* don't fork - don't run in daemon mode - read-only after startup */
int	bHaveMainQueue = 0;/* set to 1 if the main queue - in queueing mode - is available
				 * If the main queue is either not yet ready or not running in 
				 * queueing mode (mode DIRECT!), then this is set to 0.
				 */

extern	int errno;

/* main message queue and its configuration parameters */
qqueue_t *pMsgQueue = NULL;				/* the main message queue */


/* up to the next comment, prototypes that should be removed by reordering */
/* Function prototypes. */
static char **crunch_list(char *list);
static void reapchild();
static void debug_switch();
static void sighup_handler();


static int usage(void)
{
	fprintf(stderr, "usage: rsyslogd [-c<version>] [-46AdnqQvwx] [-l<hostlist>] [-s<domainlist>]\n"
			"                [-f<conffile>] [-i<pidfile>] [-N<level>] [-M<module load path>]\n"
			"                [-u<number>]\n"
			"To run rsyslogd in native mode, use \"rsyslogd -c5 <other options>\"\n\n"
			"For further information see http://www.rsyslog.com/doc\n");
	exit(1); /* "good" exit - done to terminate usage() */
}


/* ------------------------------ some support functions for imdiag ------------------------------ *
 * This is a bit dirty, but the only way to do it, at least with reasonable effort.
 * rgerhards, 2009-05-25
 */

/* return back the approximate current number of messages in the main message queue
 * This number includes the messages that reside in an associated DA queue (if
 * it exists) -- rgerhards, 2009-10-14
 */
rsRetVal
diagGetMainMsgQSize(int *piSize)
{
	DEFiRet;
	assert(piSize != NULL);
	*piSize = (pMsgQueue->pqDA != NULL) ? pMsgQueue->pqDA->iQueueSize : 0;
	*piSize += pMsgQueue->iQueueSize;
	RETiRet;
}


/* ------------------------------ end support functions for imdiag  ------------------------------ */


/* rgerhards, 2005-10-24: crunch_list is called only during option processing. So
 * it is never called once rsyslogd is running. This code
 * contains some exits, but they are considered safe because they only happen
 * during startup. Anyhow, when we review the code here, we might want to
 * reconsider the exit()s.
 */
static char **crunch_list(char *list)
{
	int count, i;
	char *p, *q;
	char **result = NULL;

	p = list;

	/* strip off trailing delimiters */
	while (p[strlen(p)-1] == LIST_DELIMITER) {
		count--;
		p[strlen(p)-1] = '\0';
	}
	/* cut off leading delimiters */
	while (p[0] == LIST_DELIMITER) {
		count--;
               p++;
	}

	/* count delimiters to calculate elements */
	for (count=i=0; p[i]; i++)
		if (p[i] == LIST_DELIMITER) count++;

	if ((result = (char **)MALLOC(sizeof(char *) * (count+2))) == NULL) {
		printf ("Sorry, can't get enough memory, exiting.\n");
		exit(0); /* safe exit, because only called during startup */
	}

	/*
	 * We now can assume that the first and last
	 * characters are different from any delimiters,
	 * so we don't have to care about this.
	 */
	count = 0;
	while ((q=strchr(p, LIST_DELIMITER))) {
		result[count] = (char *) MALLOC((q - p + 1) * sizeof(char));
		if (result[count] == NULL) {
			printf ("Sorry, can't get enough memory, exiting.\n");
			exit(0); /* safe exit, because only called during startup */
		}
		strncpy(result[count], p, q - p);
		result[count][q - p] = '\0';
		p = q; p++;
		count++;
	}
	if ((result[count] = \
	     (char *)MALLOC(sizeof(char) * strlen(p) + 1)) == NULL) {
		printf ("Sorry, can't get enough memory, exiting.\n");
		exit(0); /* safe exit, because only called during startup */
	}
	strcpy(result[count],p);
	result[++count] = NULL;

#if 0
	count=0;
	while (result[count])
		DBGPRINTF("#%d: %s\n", count, StripDomains[count++]);
#endif
	return result;
}


void untty(void)
#ifdef HAVE_SETSID
{
	if(!Debug) {
		setsid();
	}
	return;
}
#else
{
	int i;

	if(!Debug) {
		i = open(_PATH_TTY, O_RDWR|O_CLOEXEC);
		if (i >= 0) {
#			if !defined(__hpux)
				(void) ioctl(i, (int) TIOCNOTTY, NULL);
#			else
				/* TODO: we need to implement something for HP UX! -- rgerhards, 2008-03-04 */
				/* actually, HP UX should have setsid, so the code directly above should
				 * trigger. So the actual question is why it doesn't do that...
				 */
#			endif
			close(i);
		}
	}
}
#endif


/* This takes a received message that must be decoded and submits it to
 * the main message queue. This is a legacy function which is being provided
 * to aid older input plugins that do not support message creation via
 * the new interfaces themselves. It is not recommended to use this
 * function for new plugins. -- rgerhards, 2009-10-12
 */
rsRetVal
parseAndSubmitMessage(uchar *hname, uchar *hnameIP, uchar *msg, int len, int flags, flowControl_t flowCtlType,
	prop_t *pInputName, struct syslogTime *stTime, time_t ttGenTime)
{
	prop_t *pProp = NULL;
	msg_t *pMsg;
	DEFiRet;

	/* we now create our own message object and submit it to the queue */
	if(stTime == NULL) {
		CHKiRet(msgConstruct(&pMsg));
	} else {
		CHKiRet(msgConstructWithTime(&pMsg, stTime, ttGenTime));
	}
	if(pInputName != NULL)
		MsgSetInputName(pMsg, pInputName);
	MsgSetRawMsg(pMsg, (char*)msg, len);
	MsgSetFlowControlType(pMsg, flowCtlType);
	pMsg->msgFlags  = flags | NEEDS_PARSING;

	MsgSetRcvFromStr(pMsg, hname, ustrlen(hname), &pProp);
	CHKiRet(prop.Destruct(&pProp));
	CHKiRet(MsgSetRcvFromIPStr(pMsg, hnameIP, ustrlen(hnameIP), &pProp));
	CHKiRet(prop.Destruct(&pProp));
	CHKiRet(submitMsg(pMsg));

finalize_it:
	RETiRet;
}


/* this is a special function used to submit an error message. This
 * function is also passed to the runtime library as the generic error
 * message handler. -- rgerhards, 2008-04-17
 */
rsRetVal
submitErrMsg(int iErr, uchar *msg)
{
	DEFiRet;
	iRet = logmsgInternal(iErr, LOG_SYSLOG|LOG_ERR, msg, 0);
	RETiRet;
}


/* rgerhards 2004-11-09: the following is a function that can be used
 * to log a message orginating from the syslogd itself.
 */
rsRetVal
logmsgInternal(int iErr, int pri, uchar *msg, int flags)
{
	uchar pszTag[33];
	msg_t *pMsg;
	DEFiRet;

	CHKiRet(msgConstruct(&pMsg));
	MsgSetInputName(pMsg, pInternalInputName);
	MsgSetRawMsgWOSize(pMsg, (char*)msg);
	MsgSetHOSTNAME(pMsg, glbl.GetLocalHostName(), ustrlen(glbl.GetLocalHostName()));
	MsgSetRcvFrom(pMsg, glbl.GetLocalHostNameProp());
	MsgSetRcvFromIP(pMsg, pLocalHostIP);
	MsgSetMSGoffs(pMsg, 0);
	/* check if we have an error code associated and, if so,
	 * adjust the tag. -- rgerhards, 2008-06-27
	 */
	if(iErr == NO_ERRCODE) {
		MsgSetTAG(pMsg, UCHAR_CONSTANT("rsyslogd:"), sizeof("rsyslogd:") - 1);
	} else {
		size_t len = snprintf((char*)pszTag, sizeof(pszTag), "rsyslogd%d:", iErr);
		pszTag[32] = '\0'; /* just to make sure... */
		MsgSetTAG(pMsg, pszTag, len);
	}
	pMsg->iFacility = LOG_FAC(pri);
	pMsg->iSeverity = LOG_PRI(pri);
	flags |= INTERNAL_MSG;
	pMsg->msgFlags  = flags;

	/* we now check if we should print internal messages out to stderr. This was
	 * suggested by HKS as a way to help people troubleshoot rsyslog configuration
	 * (by running it interactively. This makes an awful lot of sense, so I add
	 * it here. -- rgerhards, 2008-07-28
	 * Note that error messages can not be disable during a config verify. This
	 * permits us to process unmodified config files which otherwise contain a
	 * supressor statement.
	 */
	if(((Debug == DEBUG_FULL || NoFork) && ourConf->globals.bErrMsgToStderr) || iConfigVerify) {
		if(LOG_PRI(pri) == LOG_ERR)
			fprintf(stderr, "rsyslogd: %s\n", msg);
	}

	if(bHaveMainQueue == 0) { /* not yet in queued mode */
		iminternalAddMsg(pMsg);
	} else {
               /* we have the queue, so we can simply provide the
		 * message to the queue engine.
		 */
		submitMsg(pMsg);
	}
finalize_it:
	RETiRet;
}

/* check message against ACL set
 * rgerhards, 2009-11-16
 */
#if 0
static inline rsRetVal
chkMsgAgainstACL() {
	/* if we reach this point, we had a good receive and can process the packet received */
	/* check if we have a different sender than before, if so, we need to query some new values */
	if(net.CmpHost(&frominet, frominetPrev, socklen) != 0) {
		CHKiRet(net.cvthname(&frominet, fromHost, fromHostFQDN, fromHostIP));
		memcpy(frominetPrev, &frominet, socklen); /* update cache indicator */
		/* Here we check if a host is permitted to send us
		* syslog 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
		*/
		*pbIsPermitted = net.isAllowedSender((uchar*)"UDP",
						    (struct sockaddr *)&frominet, (char*)fromHostFQDN);

		if(!*pbIsPermitted) {
			DBGPRINTF("%s is not an allowed sender\n", (char*)fromHostFQDN);
			if(glbl.GetOption_DisallowWarning) {
				time_t tt;

				datetime.GetTime(&tt);
				if(tt > ttLastDiscard + 60) {
					ttLastDiscard = tt;
					errmsg.LogError(0, NO_ERRCODE,
					"UDP message from disallowed sender %s discarded",
					(char*)fromHost);
				}
			}
		}
	}
}
#endif


/* preprocess a batch of messages, that is ready them for actual processing. This is done
 * as a first stage and totally in parallel to any other worker active in the system. So
 * it helps us keep up the overall concurrency level.
 * rgerhards, 2010-06-09
 */
static inline rsRetVal
preprocessBatch(batch_t *pBatch) {
	uchar fromHost[NI_MAXHOST];
	uchar fromHostIP[NI_MAXHOST];
	uchar fromHostFQDN[NI_MAXHOST];
	prop_t *propFromHost = NULL;
	prop_t *propFromHostIP = NULL;
	int bSingleRuleset;
	ruleset_t *batchRuleset; /* the ruleset used for all message inside the batch, if there is a single one */
	int bIsPermitted;
	msg_t *pMsg;
	int i;
	rsRetVal localRet;
	DEFiRet;

	bSingleRuleset = 1;
	batchRuleset = (pBatch->nElem > 0) ? ((msg_t*) pBatch->pElem[0].pUsrp)->pRuleset : NULL;
	
	for(i = 0 ; i < pBatch->nElem  && !*(pBatch->pbShutdownImmediate) ; i++) {
		pMsg = (msg_t*) pBatch->pElem[i].pUsrp;
		if((pMsg->msgFlags & NEEDS_ACLCHK_U) != 0) {
			DBGPRINTF("msgConsumer: UDP ACL must be checked for message (hostname-based)\n");
			if(net.cvthname(pMsg->rcvFrom.pfrominet, fromHost, fromHostFQDN, fromHostIP) != RS_RET_OK)
				continue;
			bIsPermitted = net.isAllowedSender2((uchar*)"UDP",
			    (struct sockaddr *)pMsg->rcvFrom.pfrominet, (char*)fromHostFQDN, 1);
			if(!bIsPermitted) {
				DBGPRINTF("Message from '%s' discarded, not a permitted sender host\n",
					  fromHostFQDN);
				pBatch->pElem[i].state = BATCH_STATE_DISC;
			} else {
				/* save some of the info we obtained */
				MsgSetRcvFromStr(pMsg, fromHost, ustrlen(fromHost), &propFromHost);
				CHKiRet(MsgSetRcvFromIPStr(pMsg, fromHostIP, ustrlen(fromHostIP), &propFromHostIP));
				pMsg->msgFlags &= ~NEEDS_ACLCHK_U;
			}
		}
		if((pMsg->msgFlags & NEEDS_PARSING) != 0) {
			if((localRet = parser.ParseMsg(pMsg)) != RS_RET_OK)  {
				DBGPRINTF("Message discarded, parsing error %d\n", localRet);
				pBatch->pElem[i].state = BATCH_STATE_DISC;
			}
		}
		if(pMsg->pRuleset != batchRuleset)
			bSingleRuleset = 0;
	}

	batchSetSingleRuleset(pBatch, bSingleRuleset);

finalize_it:
	if(propFromHost != NULL)
		prop.Destruct(&propFromHost);
	if(propFromHostIP != NULL)
		prop.Destruct(&propFromHostIP);
	RETiRet;
}

/* The consumer of dequeued messages. This function is called by the
 * queue engine on dequeueing of a message. It runs on a SEPARATE
 * THREAD. It receives an array of pointers, which it must iterate
 * over. We do not do any further batching, as this is of no benefit
 * for the main queue.
 */
static rsRetVal
msgConsumer(void __attribute__((unused)) *notNeeded, batch_t *pBatch, int *pbShutdownImmediate)
{
	DEFiRet;
	assert(pBatch != NULL);
	pBatch->pbShutdownImmediate = pbShutdownImmediate; /* TODO: move this to batch creation! */
	preprocessBatch(pBatch);
	ruleset.ProcessBatch(pBatch);
//TODO: the BATCH_STATE_COMM must be set somewhere down the road, but we 
//do not have this yet and so we emulate -- 2010-06-10
int i;
	for(i = 0 ; i < pBatch->nElem  && !*pbShutdownImmediate ; i++) {
		pBatch->pElem[i].state = BATCH_STATE_COMM;
	}
	RETiRet;
}


/* submit a message to the main message queue.   This is primarily
 * a hook to prevent the need for callers to know about the main message queue
 * rgerhards, 2008-02-13
 */
rsRetVal
submitMsg(msg_t *pMsg)
{
	qqueue_t *pQueue;
	ruleset_t *pRuleset;
	DEFiRet;

	ISOBJ_TYPE_assert(pMsg, msg);

	pRuleset = MsgGetRuleset(pMsg);

	pQueue = (pRuleset == NULL) ? pMsgQueue : ruleset.GetRulesetQueue(pRuleset);
	MsgPrepareEnqueue(pMsg);
	qqueueEnqObj(pQueue, pMsg->flowCtlType, (void*) pMsg);

	RETiRet;
}


/* submit multiple messages at once, very similar to submitMsg, just
 * for multi_submit_t. All messages need to go into the SAME queue!
 * rgerhards, 2009-06-16
 */
rsRetVal
multiSubmitMsg(multi_submit_t *pMultiSub)
{
	int i;
	qqueue_t *pQueue;
	ruleset_t *pRuleset;
	DEFiRet;
	assert(pMultiSub != NULL);

	if(pMultiSub->nElem == 0)
		FINALIZE;

	for(i = 0 ; i < pMultiSub->nElem ; ++i) {
		MsgPrepareEnqueue(pMultiSub->ppMsgs[i]);
	}

	pRuleset = MsgGetRuleset(pMultiSub->ppMsgs[0]);
	pQueue = (pRuleset == NULL) ? pMsgQueue : ruleset.GetRulesetQueue(pRuleset);
	iRet = pQueue->MultiEnq(pQueue, pMultiSub);
	pMultiSub->nElem = 0;

finalize_it:
	RETiRet;
}




static void
reapchild()
{
	int saved_errno = errno;
	struct sigaction sigAct;

	memset(&sigAct, 0, sizeof (sigAct));
	sigemptyset(&sigAct.sa_mask);
	sigAct.sa_handler = reapchild;
	sigaction(SIGCHLD, &sigAct, NULL);  /* reset signal handler -ASP */

	while(waitpid(-1, NULL, WNOHANG) > 0);
	errno = saved_errno;
}


/* helper to doFlushRptdMsgs() to flush the individual action links via llExecFunc
 * rgerhards, 2007-08-02
 */
DEFFUNC_llExecFunc(flushRptdMsgsActions)
{
	action_t *pAction = (action_t*) pData;
	assert(pAction != NULL);

	BEGINfunc
	LockObj(pAction);
	/* TODO: time() performance: the call below could be moved to
	 * the beginn of the llExec(). This makes it slightly less correct, but
	 * in an acceptable way. -- rgerhards, 2008-09-16
	 */
	if (pAction->f_prevcount && datetime.GetTime(NULL) >= REPEATTIME(pAction)) {
		DBGPRINTF("flush %s: repeated %d times, %d sec.\n",
		    module.GetStateName(pAction->pMod), pAction->f_prevcount,
		    repeatinterval[pAction->f_repeatcount]);
		actionWriteToAction(pAction);
		BACKOFF(pAction);
	}
	UnlockObj(pAction);

	ENDfunc
	return RS_RET_OK; /* we ignore errors, we can not do anything either way */
}


/* This method flushes repeat messages.
 */
static void
doFlushRptdMsgs(void)
{
	ruleset.IterateAllActions(runConf, flushRptdMsgsActions, NULL);
}


static void debug_switch()
{
	time_t tTime;
	struct tm tp;
	struct sigaction sigAct;

	datetime.GetTime(&tTime);
	localtime_r(&tTime, &tp);
	if(debugging_on == 0) {
		debugging_on = 1;
		dbgprintf("\n");
		dbgprintf("\n");
		dbgprintf("********************************************************************************\n");
		dbgprintf("Switching debugging_on to true at %2.2d:%2.2d:%2.2d\n",
			  tp.tm_hour, tp.tm_min, tp.tm_sec);
		dbgprintf("********************************************************************************\n");
	} else {
		dbgprintf("********************************************************************************\n");
		dbgprintf("Switching debugging_on to false at %2.2d:%2.2d:%2.2d\n",
			  tp.tm_hour, tp.tm_min, tp.tm_sec);
		dbgprintf("********************************************************************************\n");
		dbgprintf("\n");
		dbgprintf("\n");
		debugging_on = 0;
	}

	memset(&sigAct, 0, sizeof (sigAct));
	sigemptyset(&sigAct.sa_mask);
	sigAct.sa_handler = debug_switch;
	sigaction(SIGUSR1, &sigAct, NULL);
}


void legacyOptsEnq(uchar *line)
{
	legacyOptsLL_t *pNew;

	pNew = MALLOC(sizeof(legacyOptsLL_t));
	if(line == NULL)
		pNew->line = NULL;
	else
		pNew->line = (uchar *) strdup((char *) line);
	pNew->next = NULL;

	if(pLegacyOptsLL == NULL)
		pLegacyOptsLL = pNew;
	else {
		legacyOptsLL_t *pThis = pLegacyOptsLL;

		while(pThis->next != NULL)
			pThis = pThis->next;
		pThis->next = pNew;
	}
}


void legacyOptsFree(void)
{
	legacyOptsLL_t *pThis = pLegacyOptsLL, *pNext;

	while(pThis != NULL) {
		if(pThis->line != NULL)
			free(pThis->line);
		pNext = pThis->next;
		free(pThis);
		pThis = pNext;
	}
}


void legacyOptsHook(void)
{
	legacyOptsLL_t *pThis = pLegacyOptsLL;

	while(pThis != NULL) {
		if(pThis->line != NULL) {
			errno = 0;
			errmsg.LogError(0, NO_ERRCODE, "Warning: backward compatibility layer added to following "
				        "directive to rsyslog.conf: %s", pThis->line);
			conf.cfsysline(ourConf, pThis->line);
		}
		pThis = pThis->next;
	}
}


void legacyOptsParseTCP(char ch, char *arg)
{
	register int i;
	register char *pArg = arg;
	static char conflict = '\0';

	if((conflict == 'g' && ch == 't') || (conflict == 't' && ch == 'g')) {
		fprintf(stderr, "rsyslogd: If you want to use both -g and -t, use directives instead, -%c ignored.\n", ch);
		return;
	} else
		conflict = ch;

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

	/* number of sessions */
	if(*pArg == '\0' || *pArg == ',') {
		if(ch == 't')
			legacyOptsEnq((uchar *) "ModLoad imtcp");
		else if(ch == 'g')
			legacyOptsEnq((uchar *) "ModLoad imgssapi");

		if(i >= 0 && i <= 65535) {
			uchar line[30];

			if(ch == 't') {
				snprintf((char *) line, sizeof(line), "InputTCPServerRun %d", i);
			} else if(ch == 'g') {
				snprintf((char *) line, sizeof(line), "InputGSSServerRun %d", i);
			}
			legacyOptsEnq(line);
		} else {
			if(ch == 't') {
				fprintf(stderr, "rsyslogd: Invalid TCP listen port %d - changed to 514.\n", i);
				legacyOptsEnq((uchar *) "InputTCPServerRun 514");
			} else if(ch == 'g') {
				fprintf(stderr, "rsyslogd: Invalid GSS listen port %d - changed to 514.\n", i);
				legacyOptsEnq((uchar *) "InputGSSServerRun 514");
			}
		}

		if(*pArg == ',') {
			++pArg;
			while(isspace((int) *pArg))
				++pArg;
			i = 0;
			while(isdigit((int) *pArg)) {
				i = i * 10 + *pArg++ - '0';
			}
			if(i > 0) {
				uchar line[30];

				snprintf((char *) line, sizeof(line), "InputTCPMaxSessions %d", i);
				legacyOptsEnq(line);
			} else {
				if(ch == 't') {
					fprintf(stderr,	"rsyslogd: TCP session max configured "
						"to %d [-t %s] - changing to 1.\n", i, arg);
					legacyOptsEnq((uchar *) "InputTCPMaxSessions 1");
				} else if (ch == 'g') {
					fprintf(stderr,	"rsyslogd: GSS session max configured "
						"to %d [-g %s] - changing to 1.\n", i, arg);
					legacyOptsEnq((uchar *) "InputTCPMaxSessions 1");
				}
			}
		}
	} else
		fprintf(stderr, "rsyslogd: Invalid -t %s command line option.\n", arg);
}


/* doDie() is a signal handler. If called, it sets the bFinished variable
 * to indicate the program should terminate. However, it does not terminate
 * it itself, because that causes issues with multi-threading. The actual
 * termination is then done on the main thread. This solution might introduce
 * a minimal delay, but it is much cleaner than the approach of doing everything
 * inside the signal handler.
 * rgerhards, 2005-10-26
 * Note: we do not call DBGPRINTF() as this may cause us to block in case something
 * with the threading is wrong.
 */
static void doDie(int sig)
{
#	define MSG1 "DoDie called.\n"
#	define MSG2 "DoDie called 5 times - unconditional exit\n"
	static int iRetries = 0; /* debug aid */
	dbgprintf(MSG1);
	if(Debug == DEBUG_FULL)
		write(1, MSG1, sizeof(MSG1) - 1);
	if(iRetries++ == 4) {
		if(Debug == DEBUG_FULL)
			write(1, MSG2, sizeof(MSG2) - 1);
		abort();
	}
	bFinished = sig;
#	undef MSG1
#	undef MSG2
}


/* This function frees all dynamically allocated memory for program termination.
 * It must be called only immediately before exit(). It is primarily an aid
 * for memory debuggers, which prevents cluttered outupt.
 * rgerhards, 2008-03-20
 */
static void
freeAllDynMemForTermination(void)
{
	free(ourConf->globals.pszConfDAGFile);
}


/* Finalize and destruct all actions.
 */
static inline void
destructAllActions(void)
{
	ruleset.DestructAllActions(runConf);
	bHaveMainQueue = 0; // flag that internal messages need to be temporarily stored
}


/* die() is called when the program shall end. This typically only occurs
 * during sigterm or during the initialization.
 * As die() is intended to shutdown rsyslogd, it is
 * safe to call exit() here. Just make sure that die() itself is not called
 * at inapropriate places. As a general rule of thumb, it is a bad idea to add
 * any calls to die() in new code!
 * rgerhards, 2005-10-24
 */
static void
die(int sig)
{
	char buf[256];

	DBGPRINTF("exiting on signal %d\n", sig);

	/* IMPORTANT: we should close the inputs first, and THEN send our termination
	 * message. If we do it the other way around, logmsgInternal() may block on
	 * a full queue and the inputs still fill up that queue. Depending on the
	 * scheduling order, we may end up with logmsgInternal being held for a quite
	 * long time. When the inputs are terminated first, that should not happen
	 * because the queue is drained in parallel. The situation could only become
	 * an issue with extremely long running actions in a queue full environment.
	 * However, such actions are at least considered poorly written, if not
	 * outright wrong. So we do not care about this very remote problem.
	 * rgerhards, 2008-01-11
	 */

	/* close the inputs */
	DBGPRINTF("Terminating input threads...\n");
	glbl.SetGlobalInputTermination();
	thrdTerminateAll();

	/* and THEN send the termination log message (see long comment above) */
	if(sig && runConf->globals.bLogStatusMsgs) {
		(void) snprintf(buf, sizeof(buf) / sizeof(char),
		 " [origin software=\"rsyslogd\" " "swVersion=\"" VERSION \
		 "\" x-pid=\"%d\" x-info=\"http://www.rsyslog.com\"]" " exiting on signal %d.",
		 (int) myPid, sig);
		errno = 0;
		logmsgInternal(NO_ERRCODE, LOG_SYSLOG|LOG_INFO, (uchar*)buf, 0);
	}

	/* drain queue (if configured so) and stop main queue worker thread pool */
	DBGPRINTF("Terminating main queue...\n");
	qqueueDestruct(&pMsgQueue);
	pMsgQueue = NULL;

	/* Free ressources and close connections. This includes flushing any remaining
	 * repeated msgs.
	 */
	DBGPRINTF("Terminating outputs...\n");
	destructAllActions();

	DBGPRINTF("all primary multi-thread sources have been terminated - now doing aux cleanup...\n");
	/* rger 2005-02-22
	 * now clean up the in-memory structures. OK, the OS
	 * would also take care of that, but if we do it
	 * ourselfs, this makes finding memory leaks a lot
	 * easier.
	 */
	tplDeleteAll(runConf);

	/* de-init some modules */
	modExitIminternal();

	/*dbgPrintAllDebugInfo(); / * this is the last spot where this can be done - below output modules are unloaded! */

	/* the following line cleans up CfSysLineHandlers that were not based on loadable
	 * modules. As such, they are not yet cleared.
	 */
	unregCfSysLineHdlrs();

	legacyOptsFree();

	/* destruct our global properties */
	if(pInternalInputName != NULL)
		prop.Destruct(&pInternalInputName);
	if(pLocalHostIP != NULL)
		prop.Destruct(&pLocalHostIP);

	/* terminate the remaining classes */
	GlobalClassExit();

	module.UnloadAndDestructAll(eMOD_LINK_ALL);

	DBGPRINTF("Clean shutdown completed, bye\n");
	/* dbgClassExit MUST be the last one, because it de-inits the debug system */
	dbgClassExit();

	/* free all remaining memory blocks - this is not absolutely necessary, but helps
	 * us keep memory debugger logs clean and this is in aid in developing. It doesn't
	 * cost much time, so we do it always. -- rgerhards, 2008-03-20
	 */
	freeAllDynMemForTermination();
	/* NO CODE HERE - feeelAllDynMemForTermination() must be the last thing before exit()! */

	remove_pid(PidFile);

	exit(0); /* "good" exit, this is the terminator function for rsyslog [die()] */
}

/*
 * Signal handler to terminate the parent process.
 * rgerhards, 2005-10-24: this is only called during forking of the
 * detached syslogd. I consider this method to be safe.
 */
static void doexit()
{
	exit(0); /* "good" exit, only during child-creation */
}

#if 0 /* TODO: re-enable, currently not used */
/* helper to generateConfigDAG, to print out all actions via