#!/bin/sh
#
# Usage: ./dsl-start        - try to fix routing and DNS resolving
#        ./dsl-start start  - hard-core reset
#
# This script is configured for usage with T-Com (Slovak DSL provider)
#
# Skript na rozbehnutie DSL pripojenia od T-Comu, ak spojenie nefunguje
# (zvacsa routovacia tabulka a aj zoznam DNS serverov)
#
# Developed by Lubomir Host 'rajo' <rajo AT platon.sk>
# Copyright (c) 2006 Platon Group, http://platon.sk/
# Licensed under terms of GNU General Public License.
# All rights reserved.
#
# Changelog:
# 2006-10-07 - created
#

# $Platon$

export PATH="/usr/local/bin:/usr/bin:/bin:/usr/local/sbin:/usr/sbin:/sbin"

RST=""
RED=""
GREEN=""
MAGENTA=""

OK="[  ${GREEN}OK${RST}  ]"
FAILED="[${RED}FAILED${RST}]"

BR2684CTL="br2684ctl -b -c 0 -a 0.1.32"
PPPD="pppd call dsl-provider"
ROUTE="route -n"

# kontrola procesov
PID_BR=`pgrep br2684ctl`
PID_PPPD=`pgrep -f  'pppd call dsl-provider'`
PID_ALL_PPPD=`pgrep -f pppd`

echo -e "----- `date '+%Y-%m-%d %X' ` $*"

print_ok()
{
	echo "	$OK $*"
}

failed()
{ # {{{
	echo "	$FAILED $*"
	FAILED_MSG="$*"
} # }}}

routing_table()
{ # {{{
	echo ROUTE_DEST="'$1'"
	echo ROUTE_GATEWAY="'$2'"
	echo ROUTE_MASK="'$3'"
	echo ROUTE_IFACE="'$8'"
} # }}}

do_dns_hack()
{ # {{{
	cat > /etc/resolv.conf <<EOF
nameserver 195.146.132.59
nameserver 195.146.128.60
nameserver 194.154.230.66
nameserver 194.154.230.74
EOF

} # }}}

echo "${MAGENTA}Procesy${RST}"
# {{{
if [ ! -z "$PID_BR" ]; then
	print_ok "$BR2684CTL";
else
	failed "$BR2684CTL"
fi

if [ ! -z "$PID_PPPD" ]; then
	print_ok "$PPPD";
else
	failed "$PPPD"
fi
# }}}

# kontrola rozhrani
eval `/etc/firewall/ifconfig-parse.sh`
echo "${MAGENTA}Sietove rozhrania${RST}"
# {{{
for iface in eth0 ppp0 tun0; do
	ip="IP_$iface"
	ip_addr=${!ip}
	if [ ! -z "$ip_addr" ]; then
		print_ok "$iface $ip_addr";
	else
		failed "$iface";
	fi
done
for iface in nas0; do
	ip="HWaddr_$iface"
	ip_addr=${!ip}
	if [ ! -z "$ip_addr" ]; then
		print_ok "$iface $ip_addr";
	else
		failed "$iface";
	fi
done
# }}}

#
# kontrola routovacej tabulky
# {{{
UNDERSTAND_ROUTING="routing_table `$ROUTE | tail -n 1`"
eval `$UNDERSTAND_ROUTING`
REQUIRED_IFACE="${ROUTE_IFACE%0}"
REQUIRED_IFACE="${REQUIRED_IFACE%1}"

echo "${MAGENTA}Routovacia tabulka${RST}"
if [ "x$ROUTE_DEST" = "x0.0.0.0" ]; then
	print_ok "mame default route"
else
	failed "nemame default route - $ROUTE_DEST routujeme cez $ROUTE_IFACE"
	ROUTE_ERR="yes"
fi
if [ "x$ROUTE_MASK" = "x0.0.0.0" ]; then
	print_ok "routujeme vsetok traffic"
else
	failed "neroutujeme vsetok traffic - iba $ROUTE_DEST/$ROUTE_MASK"
	ROUTE_ERR="yes"
fi
if [ "x$REQUIRED_IFACE" = "xppp" ]; then
	print_ok "routujeme ho cez $ROUTE_IFACE"
else
	failed "neroutujeme cez ppp rozhranie ale cez $ROUTE_IFACE"
	ROUTE_ERR="yes"
fi

if [ "x$ROUTE_ERR" = "xyes" ]; then
	echo "PRIDAVAM DEFAULT ROUTE"
	echo route add default gw $Bcast_ppp0
	echo route add default gw $Bcast_ppp1
	route add default gw $Bcast_ppp0
	route add default gw $Bcast_ppp1
fi
# }}}

echo "${MAGENTA}Parametre siete${RST}"
# {{{
echo "	${MAGENTA}PING${RST}"
ping -c 3 195.168.3.8
echo "	${MAGENTA}DNS${RST}"
host www.zoznam.sk
if [ $? -ne 0 ]; then
	failed "nefunguje DNS"
	echo "${RED}Skusam opravit zoznam DNS serverov${RST}"
	do_dns_hack
else
	print_ok "DNS je v poriadku"
fi
# }}}

#
# Restart pripojenia, ak je problem
# {{{
if [ ! -z "$FAILED_MSG" ] && [ "x$1" = "xstart" ]; then
	echo "ZHADZUJEM ROZHRANIA"
	for iface in dsl-provider ppp0 ppp1 nas0 ; do
		ifdown $iface
		ifconfig $iface down
	done

	# zabi zvysne procesy
	echo ZABIJAM kill -9 $PID_BR $PID_ALL_PPPD
	kill -9 $PID_BR $PID_ALL_PPPD

	sleep 10

	echo "OK, SPUSTAM"
	ifup dsl-provider

fi
# }}}


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