#!/bin/sh

set -e

if [ "$BANDWIDTHD_PACKAGE_DEBUG" != "" ]; then
	set -x
fi

# Source debconf library.
. /usr/share/debconf/confmodule

db_version 2.0
db_title BandwidthD

# find devices to use as choices for debconf.
# (this should really be picked up from the output of "bandwidthd -l",
#  but since the config script is ran before the package is even unpacked
#  it can not be used.)

IFCONFIG="/sbin/ifconfig"
ROUTE="/sbin/route"
IPROUTE="/bin/ip"

LIST_DEV=""
LIST_SUBNETS=""

if [ -f $IPROUTE ]; then
	LIST_DEV=$($IPROUTE link show | grep "UP" | sed -e "s/.*: \(.*\): <.*/\1/")
	LIST_SUBNETS=$($IPROUTE route show | grep -v ^default | awk '{if (match($1, '/\\\//')) { print $1 } else { print $1 "/32" } }')
elif [ -f $IFCONFIG && -f $ROUTE ]; then
	LIST_DEV=$($IFCONFIG | grep "Link encap:" | cut -d" " -f1)
	LIST_SUBNETS=$($ROUTE -n | grep ^[0-9] | grep -v ^0.0.0.0 | cut -d" " -f1)
#else 
#	echo "WARNING: bandwidthd.config: Could not find eigther ip(route2) nor ifconfig to list interfaces."
fi

# create device list, starting by pseudo-device "any".
DEBCONF_INTERFACES="any"
for DEV in $LIST_DEV; do
		DEBCONF_INTERFACES="${DEBCONF_INTERFACES}, ${DEV}"
done

# (set default interface to eth0 if it exists, otherwise use any as
#  a fallback default since it always exists).

if [ "$(echo $DEBCONF_INTERFACES | grep -c1 ', eth0')" != 0 ]; then
	DEBCONF_INTERFACES_DEFAULT="eth0"
else
	DEBCONF_INTERFACES_DEFAULT="any"
fi

# find subnets to use as default for debconf.

for SUBNET in $LIST_SUBNETS; do
	if [ "$DEBCONF_SUBNET_DEFAULT" = "" ]; then
		DEBCONF_SUBNET_DEFAULT="${SUBNET}"
	else
		DEBCONF_SUBNET_DEFAULT="${DEBCONF_SUBNET_DEFAULT}, ${SUBNET}"
	fi
done

# Use full hostname as default sensor id.
DEBCONF_SENSORID=$(/bin/hostname -f)


if [ "$BANDWIDTHD_PACKAGE_DEBUG" != "" ]; then
	echo "dev: $DEBCONF_INTERFACES"
	echo "dev(default): $DEBCONF_INTERFACES_DEFAULT"
	echo "subnets: $DEBCONF_SUBNET_DEFAULT"
fi

if [ "$BANDWIDTHD_PACKAGE_DEBUG" != "" ]; then
	db_fset bandwidthd/dev seen false
	db_fset bandwidthd/subnet seen false
	db_fset bandwidthd/promisc seen false
	# bwdpgsql-specific:
	db_fset bandwidthd-pgsql/sensorid seen false
fi


# --- Listen on which interface? ---

# FIXME: replace db_subst "interfaces" with db_setchoices when it becomes 
# available in debconf. See Debian bug #174130.
# Set available choices.
db_subst bandwidthd/dev "interfaces" "$DEBCONF_INTERFACES" || true

# Set default choice (unless valid old value exists).
db_get bandwidthd/dev || true
if [ "$RET" = "" ]; then
	db_set bandwidthd/dev "$DEBCONF_INTERFACES_DEFAULT" || true
elif [ "$(echo $DEBCONF_INTERFACES | grep -c1 $RET)" = 0 ]; then
	db_set bandwidthd/dev "$DEBCONF_INTERFACES_DEFAULT" || true
fi

# Ask question.
db_input high bandwidthd/dev || true
db_go || true


# --- Log/Graph which subnets? ---

# Set default subnets (unless value already exists).
db_get bandwidthd/subnet || true 
if [ "$RET" = "" ] ; then
	db_set bandwidthd/subnet "$DEBCONF_SUBNET_DEFAULT" || true
fi

# Ask question.
db_input high bandwidthd/subnet || true
db_go || true

# --- Sensor id? ---

# Set fully qualified hostname as default sensor string
db_get bandwidthd-pgsql/sensorid || true
if [ "$RET" = "" ]; then
	db_set bandwidthd-pgsql/sensorid "$DEBCONF_SENSORID" || true
fi

# ask question.
db_input medium bandwidthd-pgsql/sensorid || true
db_go || true

# --- PROMISC ? ---

db_input low bandwidthd/promisc || true
db_go || true


# -------------------------------------------------------------
# Create bandwidthd.conf based on debconf data, and install it.
# -------------------------------------------------------------



db_get bandwidthd/dev || true
DEV=$RET

db_get bandwidthd/subnet || true
SUBNETS=$RET
# ATTENTION! $SUBNETS needs to be parsed and split.
# Example contents: 192.168.1.0/24, 172.20.0.0 255.255.0.0, 10.0.0.0/8


# FIXME: get pgsql-settings from debconf when it has been implemented.
PGSQL_USER="bwduser"
PGSQL_PASS="bwdpass"
PGSQL_DB="bandwidthd"
PGSQL_HOST="localhost"

db_get bandwidthd-pgsql/sensorid || true
SENSORID=$RET

db_get bandwidthd/promisc || true
PROMISC=$RET


if [ "$BANDWIDTHD_PACKAGE_DEBUG" != "" ]; then
	echo "This is the bandwidthd postinst script reporting debconf settings:"
	echo "dev: $DEV"
	echo "subnets: $SUBNETS"
	echo "promisc: $PROMISC"
fi

# parse a bandwidthd.conf template and insert dev, subnet and
# recover_cdf rules, then use ucf to install config file.

TMPDIR=$(mktemp -d)
TMPFILE=$TMPDIR/bandwidthd.conf

cp /usr/share/doc/bandwidthd-pgsql/bandwidthd-pgsql.conf $TMPFILE
chmod 640 $TMPFILE

RULE='s%^#DEBCONF_DEVS#$%dev "'$DEV'"%'
sed -e "$RULE" < $TMPFILE > $TMPFILE.new
mv $TMPFILE.new $TMPFILE

PARSED_SUBNETS=$(echo $SUBNETS | sed -e 's/, */:/g')
#PARSED_SUBNETS=$(echo $PARSED_SUBNETS | sed -e 's/^/subnet /')
OLDIFS=$IFS
IFS=":"
for subnet in $PARSED_SUBNETS ; do
	RULE='s%^#DEBCONF_SUBNETS#$%subnet '$subnet'\
#DEBCONF_SUBNETS#%'
	sed -e "$RULE" < $TMPFILE > $TMPFILE.new
	mv $TMPFILE.new $TMPFILE
done
RULE='s%^#DEBCONF_SUBNETS#$%%'
sed -e "$RULE" < $TMPFILE > $TMPFILE.new
mv $TMPFILE.new $TMPFILE
IFS=$OLDIFS


RULE='s%^#DEBCONF_PGSQL#$%pgsql_connect_string "user = '$PGSQL_USER' password = '$PGSQL_PASS' dbname = '$PGSQL_DB' host = '$PGSQL_HOST'"%'
sed -e "$RULE" < $TMPFILE > $TMPFILE.new
mv $TMPFILE.new $TMPFILE

RULE='s%^#DEBCONF_SENSORID#$%sensor_id "'$SENSORID'"%'
sed -e "$RULE" < $TMPFILE > $TMPFILE.new
mv $TMPFILE.new $TMPFILE


RULE='s%^#DEBCONF_PROMISC#$%promiscuous '$PROMISC'%'
sed -e "$RULE" < $TMPFILE > $TMPFILE.new
mv $TMPFILE.new $TMPFILE

# Install new configuration...
chmod 640 $TMPFILE
ucf $TMPFILE /etc/bandwidthd/bandwidthd.conf
chmod 640 /etc/bandwidthd/bandwidthd.conf

# clean up
rm -rf $TMPDIR