#!/bin/bash

# Company:      PowerCraft Technology
# Author:       Copyright Jelle de Jong <jelledejong@powercraft.nl>
# Note:         Please send me an email if you enhanced the script
# Version:      0.0.2
# Date:         2008-03-31 / 2009-06-04
# System:       Ubuntu/Debian GNU/Linux
# Description:  Monitor a HSDPA connection with the USB Huawei Modems

# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more de/usr/bin/tails.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
# MA 02110-1301, USA.

unset ipaddress
maximum=30
count=0
while [ -z "$ipaddress" ] && [ "$count" -lt "$maximum" ]
do
    count=$(($count+1))

    cd /sys/class/net/
    for interface in *
    do
        if [ "$interface" = "ppp0" ] && [ -z "$ipaddress" ]
        then
            ipaddress=$(/sbin/ifconfig $interface | /bin/grep 'inet addr:' | /usr/bin/cut -d: -f2 | /usr/bin/awk '{ print $1}')
            case "$ipaddress" in
            *.*.*.*)
                /bin/echo "received ipaddress: $ipaddress"
                ;;
            esac
        fi
    done

    if [ -z "$ipaddress" ]
    then
        /bin/sleep 2 && /bin/echo -ne "...get ipaddress trial: $count/$maximum \r"
    fi
done

if [ -n "$ipaddress" ]
then
    # ping -q -c 1 google.com >/dev/null 2>&1
    # if [ ! "$?" -eq 0 ]; then
        # echo "ipaddress: $ipaddress, but no successful dns resolve"
        # exit 1
    # fi
    /bin/echo "starting screen session ppp-monitor in background"
    active=$(ps ax | grep ppp-monitor | grep bwm-ng)
    [ -n "$active" ] && /usr/bin/screen -x ppp-monitor -X quit && echo "closing existing screen session"
    /usr/bin/screen -d -m -S ppp-monitor /usr/bin/bwm-ng --interfaces ppp0 --output curses --unit bytes --type sum --timeout 1000
else
    /bin/echo "connection failed, closing now"
    exit 1
fi

exit