#!/bin/sh

# usage: $0 [-f] [-n]
# -f = force. no network checks
# -n = not really. do everything but actual suspend

# presumption: eth0 is always the pcmcia. 
# my config: builtin ethernet isn't insmod'ed by default, so the system
# just doesn't know it's there.
if ifconfig eth0 >/dev/null 2>&1 ; then

	# check if there is any pending network activity
	if [ " $1" = ' -f' ] ; then
		# -f is specified, skip the network checks
		echo 'Skipping network checks'
		shift 1
	else # no -f found; normal code path

		# check mailq
		MAILQ=`mailq -Ac`
		# rh6.2: while [ "$MAILQ" != 'Mail queue is empty' ] ; do
		# rh7.0: while [ "$MAILQ" != '/var/spool/mqueue is empty' ] ; do
		# rh8.0: while [ "$MAILQ" != '/var/spool/mqueue is empty
#		Total requests: 0' ] ; do
		# rh8.0 client mqueue: (yes, multiline. WHITESPACE IMPORTANT)
		while [ "$MAILQ" != '/var/spool/clientmqueue is empty
		Total requests: 0' ] ; do
			echo 'mail pending. press enter to retry, or -f to override'
			echo "$MAILQ"
			read LINE
			if [ "$LINE" = '-f' ] ; then break ; fi
			MAILQ=`mailq -Ac`
			done
		service sendmail stop

		# check for active tcp connections
		# ignore :25 connections, as the mailq test has that covered
		# ignore web, other 'pending close' states
		# ignore X11 connections. only thing I ever use is x2x
		NETSTAT="`netstat -n --inet 2>&1 | egrep -v '(:25 |TIME_WAIT|FIN_WAIT|CLOS|LAST_ACK|127.0.0.1:|:80 |:443 |:6000 )' `"
		while [ `echo "$NETSTAT" | wc -l` != 2 ] ; do
			echo 'network connections still active. press enter to retry, or -f to override'
			# by default, only print out the filtered netstat
			echo "$NETSTAT"
			read LINE
			if [ "$LINE" = '-f' ] ; then break ; fi
			NETSTAT="`netstat -n --inet 2>&1 | egrep -v '(:25 |TIME_WAIT|FIN_WAIT|CLOS|LAST_ACK|127.0.0.1:|:80 |:443 |:6000 )' `"
			done
		fi # endif cmd line -f

	# shut down networking
	killall dhcpcd
	ifconfig eth0 down
	# sometimes the wired ethernet is there, but since it's not my
	# normal connection, it must've been temporary
	ifconfig eth1 >/dev/null 2>&1 && ifconfig eth1 down
	rmmod 3c59x
else
	echo 'No network; skipping checks'
	fi

# since I can't suspend with 2.4 acpi, additionally disable certain
# daemons because they eat cpu, and thus power
# lpd reads from disk every minute
service lpd stop
# fetchmail is how I get my mail. obviously useless if the network is down.
# PAUSE it only
killall -STOP fetchmail

# if I can suspend
if false ; then
	# eject card if possible
	#cardctl eject

	# report on battery condition
	apm

	# suspend
	if [ " $1" != ' -n' ] ; then
		sleep 2
		# -n not found; normal code path
		apm --suspend
	else # -n is specified, skip the actual suspend process
		echo 'Not really suspending...'
		fi

	# TODO: wait for eth0 to be up! else all below will fail

	fi

# if I can acpi low-power
if true ; then
	# enter low power state
	echo 4 >/proc/acpi/sleep

	echo "Press enter to revive"
	read

	echo "Getting new dhcp lease"

	# Work network is doubled, because sometimes the dhcp server
	# isn't responsive.
	# NOTE: you can press ctrl-c to skip over various networks
	# without interrupting this script
	for TRY in any Work Work any Work Work any Work Work
		do
		echo "Looking for $TRY network"
		/usr/local/etc/iwkey $TRY
		if dhcpcd -t 10 eth0 ; then break ; fi
		done

	fi

# communicate to the user that eth0 is up now
ifconfig eth0

# resume fetchmail
killall -CONT fetchmail

# kjw hack - I can't send mail directly from my laptop any more because
# of 1- dynamic addresses being blocked and 2- firewall at work, so
# sm-client starts the sendmail client, and an ssh-tunnel to my colo box,
# listening on 127.0.0.1:25.  This way I can locally queue messages for
# later delivery, yet still deliver through the colo, which is a trusted
# mail server.
#service sendmail start
service sm-client start

service lpd start

# immediately switch back into X
chvt 7

exit 0