src/racoon/session.c - platform/external/ipsec-tools - Git at Google

 /*	$NetBSD: session.c,v 1.32 2011/03/02 15:09:16 vanhu Exp $	*/

 /*	$KAME: session.c,v 1.32 2003/09/24 02:01:17 jinmei Exp $	*/

 /*
  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  * 3. Neither the name of the project nor the names of its contributors
  *    may be used to endorse or promote products derived from this software
  *    without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  */

 #include "config.h"

 #include <sys/types.h>
 #include <sys/param.h>
 #include <sys/time.h>
 #include <sys/socket.h>
 #if HAVE_SYS_WAIT_H
 # include <sys/wait.h>
 #endif
 #ifndef WEXITSTATUS
 # define WEXITSTATUS(s)	((unsigned)(s) >> 8)
 #endif
 #ifndef WIFEXITED
 # define WIFEXITED(s)	(((s) & 255) == 0)
 #endif

 #include PATH_IPSEC_H

 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
 #include <errno.h>
 #ifdef HAVE_UNISTD_H
 #include <unistd.h>
 #endif
 #include <signal.h>
 #include <sys/stat.h>
 #include <paths.h>
 #include <err.h>

 #include <netinet/in.h>
 #include <resolv.h>

 #include "libpfkey.h"

 #include "var.h"
 #include "misc.h"
 #include "vmbuf.h"
 #include "plog.h"
 #include "debug.h"

 #include "schedule.h"
 #include "session.h"
 #include "grabmyaddr.h"
 #include "evt.h"
 #include "cfparse_proto.h"
 #include "isakmp_var.h"
 #include "isakmp.h"
 #include "isakmp_var.h"
 #include "isakmp_xauth.h"
 #include "isakmp_cfg.h"
 #include "admin_var.h"
 #include "admin.h"
 #include "privsep.h"
 #include "oakley.h"
 #include "pfkey.h"
 #include "handler.h"
 #include "localconf.h"
 #include "remoteconf.h"
 #include "backupsa.h"
 #include "remoteconf.h"
 #ifdef ENABLE_NATT
 #include "nattraversal.h"
 #endif

 #include "algorithm.h" /* XXX ??? */

 #include "sainfo.h"

 struct fd_monitor {
 	int (*callback)(void *ctx, int fd);
 	void *ctx;
 	int prio;
 	int fd;
 	TAILQ_ENTRY(fd_monitor) chain;
 };

 #define NUM_PRIORITIES 2

 static void close_session __P((void));
 static void initfds __P((void));
 static void init_signal __P((void));
 static int set_signal __P((int sig, RETSIGTYPE (*func) __P((int))));
 static void check_sigreq __P((void));
 static void check_flushsa __P((void));
 static int close_sockets __P((void));

 static fd_set preset_mask, active_mask;
 static struct fd_monitor fd_monitors[FD_SETSIZE];
 static TAILQ_HEAD(fd_monitor_list, fd_monitor) fd_monitor_tree[NUM_PRIORITIES];
 static int nfds = 0;

 static volatile sig_atomic_t sigreq[NSIG + 1];
 static struct sched scflushsa = SCHED_INITIALIZER();

 void
 monitor_fd(int fd, int (*callback)(void *, int), void *ctx, int priority)
 {
 	if (fd < 0 || fd >= FD_SETSIZE) {
 		plog(LLV_ERROR, LOCATION, NULL, "fd_set overrun");
 		exit(1);
 	}

 	FD_SET(fd, &preset_mask);
 	if (fd > nfds)
 		nfds = fd;
 	if (priority <= 0)
 		priority = 0;
 	if (priority >= NUM_PRIORITIES)
 		priority = NUM_PRIORITIES - 1;

 	fd_monitors[fd].callback = callback;
 	fd_monitors[fd].ctx = ctx;
 	fd_monitors[fd].prio = priority;
 	fd_monitors[fd].fd = fd;
 	TAILQ_INSERT_TAIL(&fd_monitor_tree[priority],
 			  &fd_monitors[fd], chain);
 }

 void
 unmonitor_fd(int fd)
 {
 	if (fd < 0 || fd >= FD_SETSIZE) {
 		plog(LLV_ERROR, LOCATION, NULL, "fd_set overrun");
 		exit(1);
 	}

 	if (fd_monitors[fd].callback == NULL)
 		return;

 	FD_CLR(fd, &preset_mask);
 	FD_CLR(fd, &active_mask);
 	fd_monitors[fd].callback = NULL;
 	fd_monitors[fd].ctx = NULL;
 	TAILQ_REMOVE(&fd_monitor_tree[fd_monitors[fd].prio],
 		     &fd_monitors[fd], chain);
 }

 int
 session(void)
 {
 	struct timeval *timeout;
 	int error;
 	char pid_file[MAXPATHLEN];
 	FILE *fp;
 	pid_t racoon_pid = 0;
 	int i, count;
 	struct fd_monitor *fdm;

 	nfds = 0;
 	FD_ZERO(&preset_mask);

 	for (i = 0; i < NUM_PRIORITIES; i++)
 		TAILQ_INIT(&fd_monitor_tree[i]);

 	/* initialize schedular */
 	sched_init();
 	init_signal();

 	if (pfkey_init() < 0)
 		errx(1, "failed to initialize pfkey socket");

 	if (isakmp_init() < 0)
 		errx(1, "failed to initialize ISAKMP structures");

 #ifdef ENABLE_HYBRID
 	if (isakmp_cfg_init(ISAKMP_CFG_INIT_COLD))
 		errx(1, "could not initialize ISAKMP mode config structures");
 #endif

 #ifdef HAVE_LIBLDAP
 	if (xauth_ldap_init_conf() != 0)
 		errx(1, "could not initialize ldap config");
 #endif

 #ifdef HAVE_LIBRADIUS
 	if (xauth_radius_init_conf(0) != 0)
 		errx(1, "could not initialize radius config");
 #endif

 	myaddr_init_lists();

 	/*
 	 * in order to prefer the parameters by command line,
 	 * saving some parameters before parsing configuration file.
 	 */
 	save_params();
 	if (cfparse() != 0)
 		errx(1, "failed to parse configuration file.");
 	restore_params();

 #ifdef ENABLE_ADMINPORT
 	if (admin_init() < 0)
 		errx(1, "failed to initialize admin port socket");
 #endif


 #ifdef ENABLE_HYBRID
 	if(isakmp_cfg_config.network4 && isakmp_cfg_config.pool_size == 0)
 		if ((error = isakmp_cfg_resize_pool(ISAKMP_CFG_MAX_CNX)) != 0)
 			return error;
 #endif

 	if (dump_config)
 		dumprmconf();

 #ifdef HAVE_LIBRADIUS
 	if (xauth_radius_init() != 0)
 		errx(1, "could not initialize libradius");
 #endif

 	if (myaddr_init() != 0)
 		errx(1, "failed to listen to configured addresses");
 	myaddr_sync();

 #ifdef ENABLE_NATT
 	natt_keepalive_init ();
 #endif

 	/* write .pid file */
 	if (lcconf->pathinfo[LC_PATHTYPE_PIDFILE] == NULL)
 		strlcpy(pid_file, _PATH_VARRUN "racoon.pid", MAXPATHLEN);
 	else if (lcconf->pathinfo[LC_PATHTYPE_PIDFILE][0] == '/')
 		strlcpy(pid_file, lcconf->pathinfo[LC_PATHTYPE_PIDFILE], MAXPATHLEN);
 	else {
 		strlcat(pid_file, _PATH_VARRUN, MAXPATHLEN);
 		strlcat(pid_file, lcconf->pathinfo[LC_PATHTYPE_PIDFILE], MAXPATHLEN);
 	}
 	fp = fopen(pid_file, "w");
 	if (fp) {
 		if (fchmod(fileno(fp),
 			S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH) == -1) {
 			syslog(LOG_ERR, "%s", strerror(errno));
 			fclose(fp);
 			exit(1);
 		}
 	} else {
 		plog(LLV_ERROR, LOCATION, NULL,
 			"cannot open %s", pid_file);
 	}

 	if (privsep_init() != 0)
 		exit(1);

 	/*
 	 * The fork()'ed privileged side will close its copy of fp.  We wait
 	 * until here to get the correct child pid.
 	 */
 	racoon_pid = getpid();
 	fprintf(fp, "%ld\n", (long)racoon_pid);
 	fclose(fp);

 	for (i = 0; i <= NSIG; i++)
 		sigreq[i] = 0;

 	while (1) {
 		/*
 		 * asynchronous requests via signal.
 		 * make sure to reset sigreq to 0.
 		 */
 		check_sigreq();

 		/* scheduling */
 		timeout = schedular();

 		/* schedular can change select() mask, so we reset
 		 * the working copy here */
 		active_mask = preset_mask;

 		error = select(nfds + 1, &active_mask, NULL, NULL, timeout);
 		if (error < 0) {
 			switch (errno) {
 			case EINTR:
 				continue;
 			default:
 				plog(LLV_ERROR, LOCATION, NULL,
 					"failed to select (%s)\n",
 					strerror(errno));
 				return -1;
 			}
 			/*NOTREACHED*/
 		}

 		count = 0;
 		for (i = 0; i < NUM_PRIORITIES; i++) {
 			TAILQ_FOREACH(fdm, &fd_monitor_tree[i], chain) {
 				if (!FD_ISSET(fdm->fd, &active_mask))
 					continue;

 				FD_CLR(fdm->fd, &active_mask);
 				if (fdm->callback != NULL) {
 					fdm->callback(fdm->ctx, fdm->fd);
 					count++;
 				} else
 					plog(LLV_ERROR, LOCATION, NULL,
 					"fd %d set, but no active callback\n", i);
 			}
 			if (count != 0)
 				break;
 		}

 	}
 }

 /* clear all status and exit program. */
 static void
 close_session()
 {
 	evt_generic(EVT_RACOON_QUIT, NULL);
 	pfkey_send_flush(lcconf->sock_pfkey, SADB_SATYPE_UNSPEC);
 	flushph2();
 	flushph1();
 	flushrmconf();
 	flushsainfo();
 	close_sockets();
 	backupsa_clean();

 	plog(LLV_INFO, LOCATION, NULL, "racoon process %d shutdown\n", getpid());

 	exit(0);
 }

 static int signals[] = {
 	SIGHUP,
 	SIGINT,
 	SIGTERM,
 	SIGUSR1,
 	SIGUSR2,
 	SIGCHLD,
 	0
 };

 /*
  * asynchronous requests will actually dispatched in the
  * main loop in session().
  */
 RETSIGTYPE
 signal_handler(sig)
 	int sig;
 {
 	sigreq[sig] = 1;
 }


 /* XXX possible mem leaks and no way to go back for now !!!
  */
 static void reload_conf(){
 	int error;

 #ifdef ENABLE_HYBRID
 	if ((isakmp_cfg_init(ISAKMP_CFG_INIT_WARM)) != 0) {
 		plog(LLV_ERROR, LOCATION, NULL,
 		    "ISAKMP mode config structure reset failed, "
 		    "not reloading\n");
 		return;
 	}
 #endif

 	sainfo_start_reload();

 	/* TODO: save / restore / flush old lcconf (?) / rmtree
 	 */
 	rmconf_start_reload();

 #ifdef HAVE_LIBRADIUS
 	/* free and init radius configuration */
 	xauth_radius_init_conf(1);
 #endif

 	pfkey_reload();

 	save_params();
 	flushlcconf();
 	error = cfparse();
 	if (error != 0){
 		plog(LLV_ERROR, LOCATION, NULL, "config reload failed\n");
 		/* We are probably in an inconsistant state... */
 		return;
 	}
 	restore_params();

 #if 0
 	if (dump_config)
 		dumprmconf ();
 #endif

 	myaddr_sync();

 #ifdef HAVE_LIBRADIUS
 	/* re-initialize radius state */
 	xauth_radius_init();
 #endif

 	/* Revalidate ph1 / ph2tree !!!
 	 * update ctdtree if removing some ph1 !
 	 */
 	revalidate_ph12();
 	/* Update ctdtree ?
 	 */

 	sainfo_finish_reload();
 	rmconf_finish_reload();
 }

 static void
 check_sigreq()
 {
 	int sig, s;

 	for (sig = 0; sig <= NSIG; sig++) {
 		if (sigreq[sig] == 0)
 			continue;
 		sigreq[sig] = 0;

 		switch(sig) {
 		case 0:
 			return;

 		case SIGCHLD:
 			/* Reap all pending children */
 			while (waitpid(-1, &s, WNOHANG) > 0)
 				;
 			break;

 #ifdef DEBUG_RECORD_MALLOCATION
 		/*
 		 * XXX This operation is signal handler unsafe and may lead to
 		 * crashes and security breaches: See Henning Brauer talk at
 		 * EuroBSDCon 2005. Do not run in production with this option
 		 * enabled.
 		 */
 		case SIGUSR2:
 			DRM_dump();
 			break;
 #endif

 		case SIGHUP:
 			/* Save old configuration, load new one...  */
 			reload_conf();
 			break;

 		case SIGINT:
 		case SIGTERM:
 			plog(LLV_INFO, LOCATION, NULL,
 			    "caught signal %d\n", sig);
 			close_session();
 			break;

 		default:
 			plog(LLV_INFO, LOCATION, NULL,
 			    "caught signal %d\n", sig);
 			break;
 		}
 	}
 }

 static void
 init_signal()
 {
 	int i;

 	/*
 	 * Ignore SIGPIPE as we check the return value of system calls
 	 * that write to pipe-like fds.
 	 */
 	signal(SIGPIPE, SIG_IGN);

 	for (i = 0; signals[i] != 0; i++)
 		if (set_signal(signals[i], signal_handler) < 0) {
 			plog(LLV_ERROR, LOCATION, NULL,
 				"failed to set_signal (%s)\n",
 				strerror(errno));
 			exit(1);
 		}
 }

 static int
 set_signal(sig, func)
 	int sig;
 	RETSIGTYPE (*func) __P((int));
 {
 	struct sigaction sa;

 	memset((caddr_t)&sa, 0, sizeof(sa));
 	sa.sa_handler = func;
 	sa.sa_flags = SA_RESTART;

 	if (sigemptyset(&sa.sa_mask) < 0)
 		return -1;

 	if (sigaction(sig, &sa, (struct sigaction *)0) < 0)
 		return(-1);

 	return 0;
 }

 static int
 close_sockets()
 {
 	myaddr_close();
 	pfkey_close(lcconf->sock_pfkey);
 #ifdef ENABLE_ADMINPORT
 	(void)admin_close();
 #endif
 	return 0;
 }
	/* $NetBSD: session.c,v 1.32 2011/03/02 15:09:16 vanhu Exp $ */

	/* $KAME: session.c,v 1.32 2003/09/24 02:01:17 jinmei Exp $ */

	/*
	* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
	* All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions
	* are met:
	* 1. Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	* 2. Redistributions in binary form must reproduce the above copyright
	* notice, this list of conditions and the following disclaimer in the
	* documentation and/or other materials provided with the distribution.
	* 3. Neither the name of the project nor the names of its contributors
	* may be used to endorse or promote products derived from this software
	* without specific prior written permission.
	*
	* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	* SUCH DAMAGE.
	*/

	#include "config.h"

	#include <sys/types.h>
	#include <sys/param.h>
	#include <sys/time.h>
	#include <sys/socket.h>
	#if HAVE_SYS_WAIT_H
	# include <sys/wait.h>
	#endif
	#ifndef WEXITSTATUS
	# define WEXITSTATUS(s) ((unsigned)(s) >> 8)
	#endif
	#ifndef WIFEXITED
	# define WIFEXITED(s) (((s) & 255) == 0)
	#endif

	#include PATH_IPSEC_H

	#include <stdlib.h>
	#include <stdio.h>
	#include <string.h>
	#include <errno.h>
	#ifdef HAVE_UNISTD_H
	#include <unistd.h>
	#endif
	#include <signal.h>
	#include <sys/stat.h>
	#include <paths.h>
	#include <err.h>

	#include <netinet/in.h>
	#include <resolv.h>

	#include "libpfkey.h"

	#include "var.h"
	#include "misc.h"
	#include "vmbuf.h"
	#include "plog.h"
	#include "debug.h"

	#include "schedule.h"
	#include "session.h"
	#include "grabmyaddr.h"
	#include "evt.h"
	#include "cfparse_proto.h"
	#include "isakmp_var.h"
	#include "isakmp.h"
	#include "isakmp_var.h"
	#include "isakmp_xauth.h"
	#include "isakmp_cfg.h"
	#include "admin_var.h"
	#include "admin.h"
	#include "privsep.h"
	#include "oakley.h"
	#include "pfkey.h"
	#include "handler.h"
	#include "localconf.h"
	#include "remoteconf.h"
	#include "backupsa.h"
	#include "remoteconf.h"
	#ifdef ENABLE_NATT
	#include "nattraversal.h"
	#endif

	#include "algorithm.h" /* XXX ??? */

	#include "sainfo.h"

	struct fd_monitor {
	int (callback)(void ctx, int fd);
	void *ctx;
	int prio;
	int fd;
	TAILQ_ENTRY(fd_monitor) chain;
	};

	#define NUM_PRIORITIES 2

	static void close_session __P((void));
	static void initfds __P((void));
	static void init_signal __P((void));
	static int set_signal __P((int sig, RETSIGTYPE (*func) __P((int))));
	static void check_sigreq __P((void));
	static void check_flushsa __P((void));
	static int close_sockets __P((void));

	static fd_set preset_mask, active_mask;
	static struct fd_monitor fd_monitors[FD_SETSIZE];
	static TAILQ_HEAD(fd_monitor_list, fd_monitor) fd_monitor_tree[NUM_PRIORITIES];
	static int nfds = 0;

	static volatile sig_atomic_t sigreq[NSIG + 1];
	static struct sched scflushsa = SCHED_INITIALIZER();

	void
	monitor_fd(int fd, int (callback)(void , int), void *ctx, int priority)
	{
	if (fd < 0 \|\| fd >= FD_SETSIZE) {
	plog(LLV_ERROR, LOCATION, NULL, "fd_set overrun");
	exit(1);
	}

	FD_SET(fd, &preset_mask);
	if (fd > nfds)
	nfds = fd;
	if (priority <= 0)
	priority = 0;
	if (priority >= NUM_PRIORITIES)
	priority = NUM_PRIORITIES - 1;

	fd_monitors[fd].callback = callback;
	fd_monitors[fd].ctx = ctx;
	fd_monitors[fd].prio = priority;
	fd_monitors[fd].fd = fd;
	TAILQ_INSERT_TAIL(&fd_monitor_tree[priority],
	&fd_monitors[fd], chain);
	}

	void
	unmonitor_fd(int fd)
	{
	if (fd < 0 \|\| fd >= FD_SETSIZE) {
	plog(LLV_ERROR, LOCATION, NULL, "fd_set overrun");
	exit(1);
	}

	if (fd_monitors[fd].callback == NULL)
	return;

	FD_CLR(fd, &preset_mask);
	FD_CLR(fd, &active_mask);
	fd_monitors[fd].callback = NULL;
	fd_monitors[fd].ctx = NULL;
	TAILQ_REMOVE(&fd_monitor_tree[fd_monitors[fd].prio],
	&fd_monitors[fd], chain);
	}

	int
	session(void)
	{
	struct timeval *timeout;
	int error;
	char pid_file[MAXPATHLEN];
	FILE *fp;
	pid_t racoon_pid = 0;
	int i, count;
	struct fd_monitor *fdm;

	nfds = 0;
	FD_ZERO(&preset_mask);

	for (i = 0; i < NUM_PRIORITIES; i++)
	TAILQ_INIT(&fd_monitor_tree[i]);

	/* initialize schedular */
	sched_init();
	init_signal();

	if (pfkey_init() < 0)
	errx(1, "failed to initialize pfkey socket");

	if (isakmp_init() < 0)
	errx(1, "failed to initialize ISAKMP structures");

	#ifdef ENABLE_HYBRID
	if (isakmp_cfg_init(ISAKMP_CFG_INIT_COLD))
	errx(1, "could not initialize ISAKMP mode config structures");
	#endif

	#ifdef HAVE_LIBLDAP
	if (xauth_ldap_init_conf() != 0)
	errx(1, "could not initialize ldap config");
	#endif

	#ifdef HAVE_LIBRADIUS
	if (xauth_radius_init_conf(0) != 0)
	errx(1, "could not initialize radius config");
	#endif

	myaddr_init_lists();

	/*
	* in order to prefer the parameters by command line,
	* saving some parameters before parsing configuration file.
	*/
	save_params();
	if (cfparse() != 0)
	errx(1, "failed to parse configuration file.");
	restore_params();

	#ifdef ENABLE_ADMINPORT
	if (admin_init() < 0)
	errx(1, "failed to initialize admin port socket");
	#endif


	#ifdef ENABLE_HYBRID
	if(isakmp_cfg_config.network4 && isakmp_cfg_config.pool_size == 0)
	if ((error = isakmp_cfg_resize_pool(ISAKMP_CFG_MAX_CNX)) != 0)
	return error;
	#endif

	if (dump_config)
	dumprmconf();

	#ifdef HAVE_LIBRADIUS
	if (xauth_radius_init() != 0)
	errx(1, "could not initialize libradius");
	#endif

	if (myaddr_init() != 0)
	errx(1, "failed to listen to configured addresses");
	myaddr_sync();

	#ifdef ENABLE_NATT
	natt_keepalive_init ();
	#endif

	/* write .pid file */
	if (lcconf->pathinfo[LC_PATHTYPE_PIDFILE] == NULL)
	strlcpy(pid_file, _PATH_VARRUN "racoon.pid", MAXPATHLEN);
	else if (lcconf->pathinfo[LC_PATHTYPE_PIDFILE][0] == '/')
	strlcpy(pid_file, lcconf->pathinfo[LC_PATHTYPE_PIDFILE], MAXPATHLEN);
	else {
	strlcat(pid_file, _PATH_VARRUN, MAXPATHLEN);
	strlcat(pid_file, lcconf->pathinfo[LC_PATHTYPE_PIDFILE], MAXPATHLEN);
	}
	fp = fopen(pid_file, "w");
	if (fp) {
	if (fchmod(fileno(fp),
	S_IRUSR \| S_IWUSR \| S_IRGRP \| S_IROTH) == -1) {
	syslog(LOG_ERR, "%s", strerror(errno));
	fclose(fp);
	exit(1);
	}
	} else {
	plog(LLV_ERROR, LOCATION, NULL,
	"cannot open %s", pid_file);
	}

	if (privsep_init() != 0)
	exit(1);

	/*
	* The fork()'ed privileged side will close its copy of fp. We wait
	* until here to get the correct child pid.
	*/
	racoon_pid = getpid();
	fprintf(fp, "%ld\n", (long)racoon_pid);
	fclose(fp);

	for (i = 0; i <= NSIG; i++)
	sigreq[i] = 0;

	while (1) {
	/*
	* asynchronous requests via signal.
	* make sure to reset sigreq to 0.
	*/
	check_sigreq();

	/* scheduling */
	timeout = schedular();

	/* schedular can change select() mask, so we reset
	* the working copy here */
	active_mask = preset_mask;

	error = select(nfds + 1, &active_mask, NULL, NULL, timeout);
	if (error < 0) {
	switch (errno) {
	case EINTR:
	continue;
	default:
	plog(LLV_ERROR, LOCATION, NULL,
	"failed to select (%s)\n",
	strerror(errno));
	return -1;
	}
	/NOTREACHED/
	}

	count = 0;
	for (i = 0; i < NUM_PRIORITIES; i++) {
	TAILQ_FOREACH(fdm, &fd_monitor_tree[i], chain) {
	if (!FD_ISSET(fdm->fd, &active_mask))
	continue;

	FD_CLR(fdm->fd, &active_mask);
	if (fdm->callback != NULL) {
	fdm->callback(fdm->ctx, fdm->fd);
	count++;
	} else
	plog(LLV_ERROR, LOCATION, NULL,
	"fd %d set, but no active callback\n", i);
	}
	if (count != 0)
	break;
	}

	}
	}

	/* clear all status and exit program. */
	static void
	close_session()
	{
	evt_generic(EVT_RACOON_QUIT, NULL);
	pfkey_send_flush(lcconf->sock_pfkey, SADB_SATYPE_UNSPEC);
	flushph2();
	flushph1();
	flushrmconf();
	flushsainfo();
	close_sockets();
	backupsa_clean();

	plog(LLV_INFO, LOCATION, NULL, "racoon process %d shutdown\n", getpid());

	exit(0);
	}

	static int signals[] = {
	SIGHUP,
	SIGINT,
	SIGTERM,
	SIGUSR1,
	SIGUSR2,
	SIGCHLD,
	0
	};

	/*
	* asynchronous requests will actually dispatched in the
	* main loop in session().
	*/
	RETSIGTYPE
	signal_handler(sig)
	int sig;
	{
	sigreq[sig] = 1;
	}


	/* XXX possible mem leaks and no way to go back for now !!!
	*/
	static void reload_conf(){
	int error;

	#ifdef ENABLE_HYBRID
	if ((isakmp_cfg_init(ISAKMP_CFG_INIT_WARM)) != 0) {
	plog(LLV_ERROR, LOCATION, NULL,
	"ISAKMP mode config structure reset failed, "
	"not reloading\n");
	return;
	}
	#endif

	sainfo_start_reload();

	/* TODO: save / restore / flush old lcconf (?) / rmtree
	*/
	rmconf_start_reload();

	#ifdef HAVE_LIBRADIUS
	/* free and init radius configuration */
	xauth_radius_init_conf(1);
	#endif

	pfkey_reload();

	save_params();
	flushlcconf();
	error = cfparse();
	if (error != 0){
	plog(LLV_ERROR, LOCATION, NULL, "config reload failed\n");
	/* We are probably in an inconsistant state... */
	return;
	}
	restore_params();

	#if 0
	if (dump_config)
	dumprmconf ();
	#endif

	myaddr_sync();

	#ifdef HAVE_LIBRADIUS
	/* re-initialize radius state */
	xauth_radius_init();
	#endif

	/* Revalidate ph1 / ph2tree !!!
	* update ctdtree if removing some ph1 !
	*/
	revalidate_ph12();
	/* Update ctdtree ?
	*/

	sainfo_finish_reload();
	rmconf_finish_reload();
	}

	static void
	check_sigreq()
	{
	int sig, s;

	for (sig = 0; sig <= NSIG; sig++) {
	if (sigreq[sig] == 0)
	continue;
	sigreq[sig] = 0;

	switch(sig) {
	case 0:
	return;

	case SIGCHLD:
	/* Reap all pending children */
	while (waitpid(-1, &s, WNOHANG) > 0)
	;
	break;

	#ifdef DEBUG_RECORD_MALLOCATION
	/*
	* XXX This operation is signal handler unsafe and may lead to
	* crashes and security breaches: See Henning Brauer talk at
	* EuroBSDCon 2005. Do not run in production with this option
	* enabled.
	*/
	case SIGUSR2:
	DRM_dump();
	break;
	#endif

	case SIGHUP:
	/* Save old configuration, load new one... */
	reload_conf();
	break;

	case SIGINT:
	case SIGTERM:
	plog(LLV_INFO, LOCATION, NULL,
	"caught signal %d\n", sig);
	close_session();
	break;

	default:
	plog(LLV_INFO, LOCATION, NULL,
	"caught signal %d\n", sig);
	break;
	}
	}
	}

	static void
	init_signal()
	{
	int i;

	/*
	* Ignore SIGPIPE as we check the return value of system calls
	* that write to pipe-like fds.
	*/
	signal(SIGPIPE, SIG_IGN);

	for (i = 0; signals[i] != 0; i++)
	if (set_signal(signals[i], signal_handler) < 0) {
	plog(LLV_ERROR, LOCATION, NULL,
	"failed to set_signal (%s)\n",
	strerror(errno));
	exit(1);
	}
	}

	static int
	set_signal(sig, func)
	int sig;
	RETSIGTYPE (*func) __P((int));
	{
	struct sigaction sa;

	memset((caddr_t)&sa, 0, sizeof(sa));
	sa.sa_handler = func;
	sa.sa_flags = SA_RESTART;

	if (sigemptyset(&sa.sa_mask) < 0)
	return -1;

	if (sigaction(sig, &sa, (struct sigaction *)0) < 0)
	return(-1);

	return 0;
	}

	static int
	close_sockets()
	{
	myaddr_close();
	pfkey_close(lcconf->sock_pfkey);
	#ifdef ENABLE_ADMINPORT
	(void)admin_close();
	#endif
	return 0;
	}