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simplify, shorten, and "subtly and cleverly" rearrange some daemon
startups according to rules that some of us understand.  it may come of
sounding cocky, but any step beyond that would end up with a dependency
graph which will never happen.  this file is now ~60% of the length a
week ago.
ok guenther, robert, aja and people who will not test it until it is in

#	$OpenBSD: rc,v 1.379 2011/07/08 09:48:18 deraadt Exp $

# System startup script run by init on autoboot
# or after single-user.
# Output and error are redirected to console by init,
# and the console is the controlling terminal.

# Subroutines (have to come first).

# Strip comments (and leading/trailing whitespace if IFS is set)
# from a file and spew to stdout
stripcom() {
	local _file="$1"
	local _line

	{
		while read _line ; do
			_line=${_line%%#*}		# strip comments
			test -z "$_line" && continue
			echo $_line
		done
	} < $_file
}

# Update resource limits when sysctl changes
# Usage: update_limit -X loginconf_name
update_limit() {
	local _fl="$1"	# ulimit flag
	local _lc="$2"	# login.conf name
	local _new _suf

	for _suf in "" -cur -max; do
		_new=`getcap -f /etc/login.conf -s ${_lc}${_suf} daemon 2>/dev/null`
		if [ X"$_new" != X"" ]; then
			if [ X"$_new" = X"infinity" ]; then
				_new=unlimited
			fi
			case "$_suf" in
			-cur)
				ulimit -S $_fl $_new
				;;
			-max)
				ulimit -H $_fl $_new
				;;
			*)
				ulimit $_fl $_new
				return
				;;
			esac
		fi
	done
}

sysctl_conf() {
	test -s /etc/sysctl.conf || return

	# delete comments and blank lines
	set -- `stripcom /etc/sysctl.conf`
	while [ $# -ge 1 ] ; do
		sysctl $1
		# update limits if needed
		case $1 in
		kern.maxproc=*)
			update_limit -p maxproc
			;;
		kern.maxfiles=*)
			update_limit -n openfiles
			;;
		esac
		shift
	done
}

mixerctl_conf()
{
	test -s /etc/mixerctl.conf || return

	# delete comments and blank lines
	set -- `stripcom /etc/mixerctl.conf`
	while [ $# -ge 1 ] ; do
		mixerctl -q $1 > /dev/null 2>&1
		shift
	done
}

wsconsctl_conf()
{
	local save_IFS="$IFS"

	test -x /sbin/wsconsctl -a -s /etc/wsconsctl.conf || return
	# delete comments and blank lines
	IFS="
"
	set -- `stripcom /etc/wsconsctl.conf`
	IFS="$save_IFS"
	while [ $# -ge 1 ] ; do
		eval wsconsctl $1
		shift
	done
}

random_seed()
{
	if [ -f /var/db/host.random -a "X$random_seed_done" = "X" ]; then
		dd if=/var/db/host.random of=/dev/arandom bs=65536 count=1 \
		    > /dev/null 2>&1

		# reset seed file, so that if a shutdown-less reboot occurs,
		# the next seed is not a repeat
		dd if=/dev/arandom of=/var/db/host.random bs=65536 count=1 \
		    > /dev/null 2>&1

		random_seed_done=1
	fi
}

fill_baddynamic()
{
	local _service="$1"
	local _sysctl="net.inet.${_service}.baddynamic"
	local _name _port _srv _junk _ban
	local _i=0
	grep "/${_service}" /etc/services | {
		IFS=" 	/"
		while read _name _port _srv _junk; do
			[ "x${_srv}" = "x${_service}" ] || continue;
			if [ "x${_ban}" = "x" ]; then
				_ban="+${_port}"
			else
				_ban="${_ban},+${_port}"
			fi
			# Flush before argv gets too long
			if [ $((++_i)) -gt 128 ]; then
				sysctl ${_sysctl}=${_ban} >/dev/null
				_ban=""
				_i=0
			fi
		done;
		if [ "x${_ban}" != "x" ]; then
			sysctl ${_sysctl}=${_ban} >/dev/null
		fi
	}
}

start_daemon()
{
	local _n
	for _n; do
		eval _do=\${${_n}_flags}
		if [ X"${_do}" != X"NO" ]; then
			/etc/rc.d/${_n} start
		fi
	done
}

make_keys()
{
	if [ X"${named_flags}" != X"NO" ]; then
		if ! cmp -s /etc/rndc.key /var/named/etc/rndc.key ; then
			echo -n "rndc-confgen: generating shared secret... "
			if rndc-confgen -a -t /var/named >/dev/null 2>&1; then
				chmod 0640 /var/named/etc/rndc.key \
				    >/dev/null 2>&1
				echo done.
			else
				echo failed.
			fi
		fi
	fi

	if [ ! -f /etc/isakmpd/private/local.key ]; then
		echo -n "openssl: generating isakmpd/iked RSA key... "
		if openssl genrsa -out /etc/isakmpd/private/local.key 2048 \
		    >/dev/null 2>&1; then
			chmod 600 /etc/isakmpd/private/local.key
			openssl rsa -out /etc/isakmpd/local.pub -in \
			    /etc/isakmpd/private/local.key -pubout \
			    >/dev/null 2>&1
			echo done.
		else
			echo failed.
		fi
	fi

	if [ ! -f /etc/iked/private/local.key ]; then
		# Just copy the generated isakmpd key
		cp /etc/isakmpd/private/local.key /etc/iked/private/local.key
		chmod 600 /etc/iked/private/local.key
		cp /etc/isakmpd/local.pub /etc/iked/local.pub
	fi

	ssh-keygen -A
}

# create Unix sockets directories for X if needed and make sure they have
# correct permissions
setup_X_sockets()
{
	if [ -d /usr/X11R6/lib ]; then
		for d in /tmp/.X11-unix /tmp/.ICE-unix ; do
			if [ -d $d ]; then
				if [ `ls -ld $d | cut -d' ' -f4` \
				    != root ]; then
					chown root $d
				fi
				if [ `ls -ld $d | cut -d' ' -f1` \
				    != drwxrwxrwt ]; then
					chmod 1777 $d
				fi
			elif [ -e $d ]; then
				echo "Error: $d exists and isn't a directory."
			else
				mkdir -m 1777 $d
			fi
		done
	fi
}

# End subroutines

stty status '^T'

# Set shell to ignore SIGINT (2), but not children;
# shell catches SIGQUIT (3) and returns to single user after fsck.
trap : 2
trap : 3	# shouldn't be needed

HOME=/; export HOME
INRC=1; export INRC
PATH=/sbin:/bin:/usr/sbin:/usr/bin
export PATH

# pick up option configuration
. /etc/rc.conf

if [ X"$1" = X"shutdown" ]; then
	dd if=/dev/arandom of=/var/db/host.random bs=65536 count=1 >/dev/null 2>&1
	chmod 600 /var/db/host.random >/dev/null 2>&1
	local _c=$?
	if [ ${_c} -eq 0 -a -n "${rc_scripts}" ]; then
		echo -n 'stopping package daemons:'
		while [ -n "${rc_scripts}" ]; do
			_r=${rc_scripts##* }
			rc_scripts=${rc_scripts%%*( )${_r}}
			[ -x /etc/rc.d/${_r} ] && /etc/rc.d/${_r} stop
		done
		echo '.'
	fi
	if [ ${_c} -eq 0 -a -f /etc/rc.shutdown ]; then
		echo /etc/rc.shutdown in progress...
		. /etc/rc.shutdown
		echo /etc/rc.shutdown complete.

		# bring carp interfaces down gracefully
		ifconfig | while read a b; do
			case $a in
			carp+([0-9]):) ifconfig ${a%:} down ;;
			esac
		done

		if [ X"${powerdown}" = X"YES" ]; then
			exit 2
		fi

	else
		echo single user: not running /etc/rc.shutdown
	fi
	exit 0
fi

# Configure ccd devices.
if [ -f /etc/ccd.conf ]; then
	ccdconfig -C
fi

# Configure raid devices.
for dev in 0 1 2 3; do
	if [ -f /etc/raid$dev.conf ]; then
		raidctl -c /etc/raid$dev.conf raid$dev
	fi
done

# Check parity on raid devices.
raidctl -P all

swapctl -A -t blk

if [ -e /fastboot ]; then
	echo "Fast boot: skipping disk checks."
elif [ X"$1" = X"autoboot" ]; then
	echo "Automatic boot in progress: starting file system checks."
	fsck -p
	case $? in
	0)
		;;
	2)
		exit 1
		;;
	4)
		echo "Rebooting..."
		reboot
		echo "Reboot failed; help!"
		exit 1
		;;
	8)
		echo "Automatic file system check failed; help!"
		exit 1
		;;
	12)
		echo "Boot interrupted."
		exit 1
		;;
	130)
		# interrupt before catcher installed
		exit 1
		;;
	*)
		echo "Unknown error; help!"
		exit 1
		;;
	esac
fi

trap "echo 'Boot interrupted.'; exit 1" 3

umount -a >/dev/null 2>&1
mount -a -t nonfs,vnd
mount -uw /		# root on nfs requires this, others aren't hurt
rm -f /fastboot		# XXX (root now writeable)

random_seed

# set flags on ttys.  (do early, in case they use tty for SLIP in netstart)
echo 'setting tty flags'
ttyflags -a

if [ -f /sbin/kbd -a -f /etc/kbdtype ]; then
	kbd `cat /etc/kbdtype`
fi

wsconsctl_conf

if [ X"${pf}" != X"NO" ]; then
	RULES="block all"
	RULES="$RULES\npass on lo0"
	RULES="$RULES\npass in proto tcp from any to any port 22 keep state"
	RULES="$RULES\npass out proto { tcp, udp } from any to any port 53 keep state"
	RULES="$RULES\npass out inet proto icmp all icmp-type echoreq keep state"
	if ifconfig lo0 inet6 >/dev/null 2>&1; then
		RULES="$RULES\npass out inet6 proto icmp6 all icmp6-type neighbrsol"
		RULES="$RULES\npass in inet6 proto icmp6 all icmp6-type neighbradv"
		RULES="$RULES\npass out inet6 proto icmp6 all icmp6-type routersol"
		RULES="$RULES\npass in inet6 proto icmp6 all icmp6-type routeradv"
	fi
	RULES="$RULES\npass proto carp keep state (no-sync)"
	case `sysctl vfs.mounts.nfs 2>/dev/null` in
	*[1-9]*)
		# don't kill NFS
		RULES="set reassemble yes no-df\n$RULES"
		RULES="$RULES\npass in proto { tcp, udp } from any port { 111, 2049 } to any"
		RULES="$RULES\npass out proto { tcp, udp } from any to any port { 111, 2049 }"
		;;
	esac
	echo $RULES | pfctl -f -
	pfctl -e
fi

# Fill net.inet.(tcp|udp).baddynamic lists from /etc/services
fill_baddynamic udp
fill_baddynamic tcp

sysctl_conf

# set hostname, turn on network
echo 'starting network'
ifconfig -g carp carpdemote 128
if [ -f /etc/resolv.conf.save ]; then
	mv -f /etc/resolv.conf.save /etc/resolv.conf
	touch /etc/resolv.conf
fi
. /etc/netstart
echo rekey > /dev/arandom	# any write triggers an RC4 rekey

if [ X"${pf}" != X"NO" ]; then
	if [ -f ${pf_rules} ]; then
		pfctl -f ${pf_rules}
	fi
	# bring up pfsync after the working ruleset has been loaded
	if [ -f /etc/hostname.pfsync0 ]; then
		. /etc/netstart pfsync0
	fi
fi

mount -s /usr >/dev/null 2>&1
mount -s /var >/dev/null 2>&1

# if there's no /var/db/host.random, use /dev/arandom to create one
if [ ! -f /var/db/host.random ]; then
	dd if=/dev/arandom of=/var/db/host.random bs=65536 count=1 \
		>/dev/null 2>&1
	chmod 600 /var/db/host.random >/dev/null 2>&1
else
	# Try to read seed if it was not initially present (e.g. /var on NFS)
	random_seed
fi

# clean up left-over files
rm -f /etc/nologin /var/spool/lock/LCK.* /var/spool/uucp/STST/*
(cd /var/run && { rm -rf -- *; install -c -m 664 -g utmp /dev/null utmp; })
(cd /var/authpf && rm -rf -- *)

# save a copy of the boot messages
dmesg >/var/run/dmesg.boot

make_keys

echo -n 'starting early daemons:'
start_daemon syslogd ldattach

if [ X"${pf}" != X"NO" ]; then
	ifconfig pflog0 create >/dev/null 2>&1
	if ifconfig pflog0 >/dev/null 2>&1; then
		ifconfig pflog0 up
		start_daemon pflogd
	fi
fi

start_daemon named nsd ntpd isakmpd iked sasyncd
echo '.'

if [ X"${ipsec}" != X"NO" ]; then
	if [ -f ${ipsec_rules} ]; then
		ipsecctl -f ${ipsec_rules}
	fi
fi

echo -n 'starting RPC daemons:'
start_daemon portmap
if [ X"`domainname`" != X"" ]; then
	start_daemon ypserv ypldap ypbind yppasswdd
fi
start_daemon mountd nfsd lockd statd amd
echo '.'

mount -a
swapctl -A -t noblk

# /var/crash should be a directory or a symbolic link
# to the crash directory if core dumps are to be saved.
if [ -d /var/crash ]; then
	savecore ${savecore_flags} /var/crash
fi

if [ X"${check_quotas}" = X"YES" ]; then
	echo -n 'checking quotas:'
	quotacheck -a
	echo ' done.'
	quotaon -a
fi

kvm_mkdb			# build kvm(3) databases
dev_mkdb
chmod 666 /dev/tty[pqrstuvwxyzPQRST]*
chown root:wheel /dev/tty[pqrstuvwxyzPQRST]*

# check the password temp/lock file
if [ -f /etc/ptmp ]; then
	logger -s -p auth.err \
	    'password file may be incorrect -- /etc/ptmp exists'
fi

echo clearing /tmp

# prune quickly with one rm, then use find to clean up /tmp/[lq]*
# (not needed with mfs /tmp, but doesn't hurt there...)
(cd /tmp && rm -rf [a-km-pr-zA-Z]*)
(cd /tmp &&
    find . ! -name . ! -name lost+found ! -name quota.user \
	! -name quota.group -execdir rm -rf -- {} \; -type d -prune)

setup_X_sockets

[ -f /etc/rc.securelevel ] && . /etc/rc.securelevel
if [ X"${securelevel}" != X"" ]; then
	echo -n 'setting kernel security level: '
	sysctl kern.securelevel=${securelevel}
fi

# patch /etc/motd
if [ ! -f /etc/motd ]; then
	install -c -o root -g wheel -m 664 /dev/null /etc/motd
fi
if T=`mktemp /tmp/_motd.XXXXXXXXXX`; then
	sysctl -n kern.version | sed 1q > $T
	echo "" >> $T
	sed '1,/^$/d' < /etc/motd >> $T
	cmp -s $T /etc/motd || cp $T /etc/motd
	rm -f $T
fi

if [ X"${accounting}" = X"YES" ]; then
	if [ ! -f /var/account/acct ]; then
		touch /var/account/acct
	fi
	echo 'turning on accounting';	accton /var/account/acct
fi

if [ -f /sbin/ldconfig ]; then
	echo 'creating runtime link editor directory cache.'
	if [ -d /usr/local/lib ]; then
		shlib_dirs="/usr/local/lib $shlib_dirs"
	fi
	if [ -d /usr/X11R6/lib ]; then
		shlib_dirs="/usr/X11R6/lib $shlib_dirs"
	fi
	ldconfig $shlib_dirs
fi

echo 'preserving editor files.';	/usr/libexec/vi.recover

echo -n 'starting network daemons:'
start_daemon sshd snmpd ldpd ripd bgpd ifstated relayd dhcpd
start_daemon dhcrelay mrouted dvmrpd

if ifconfig lo0 inet6 >/dev/null 2>&1; then
	fw=`sysctl -n net.inet6.ip6.forwarding`
	if [ X"${fw}" = X"0" ]; then
		start_daemon rtsold
	else
		start_daemon route6d rtadvd
	fi
fi

start_daemon hostapd rwhod lpd ldapd sendmail smtpd httpd ftpd
start_daemon ftpproxy identd inetd rarpd bootparamd rbootd mopd
start_daemon spamd spamlogd kdc kadmind kpasswdd
echo '.'

if [ X"${spamd_flags}" != X"NO" ]; then
	/usr/libexec/spamd-setup -D
fi

# If rc.firstime exists, run it just once, and make sure it is deleted
if [ -f /etc/rc.firsttime ]; then
	mv /etc/rc.firsttime /etc/rc.firsttime.run
	. /etc/rc.firsttime.run 2>&1 | mail -s 'rc.firsttime output' \
	    root >/dev/null
fi
rm -f /etc/rc.firsttime.run

# Run rc.d(8) scripts from packages
if [ -n "${rc_scripts}" ]; then
	echo -n 'starting package daemons:'
	for _r in $rc_scripts; do
		[ -x /etc/rc.d/${_r} ] && start_daemon ${_r}
	done
	echo '.'
fi

[ -f /etc/rc.local ] && . /etc/rc.local

ifconfig -g carp -carpdemote 128	# disable carp interlock

mixerctl_conf
echo -n 'starting local daemons:'
start_daemon apmd sensorsd hotplugd watchdogd cron aucat wsmoused xdm
echo '.'

date
exit 0