#!/bin/bash
###############################################################################
# Establish a PPP connection using a Siemens phone, IrDA and GPRS.
#
# Originaly developed by: Per Weijnitz <perweij@stp.ling.uu.se>
# Modified to use any network by: Maciej Kosiedowski <lusnia@gmail.com>
###############################################################################
if [[ $1 != "" && $2 != "" && $3 != "" ]]; then

	USER="$1"
	PASS="$2"
	APN="$3"
	IRCOMMDEV=/dev/ircomm0
	if [[ $4 == "" ]]; then
		NUMBER="*99***1#"
	else
		NUMBER="$4"
	fi
# See whether there is irda0 interface
	if ! /sbin/ifconfig irda0 >/dev/null 2>/dev/null
	then
		echo "Cannot find network interface irda0!" >&2
		exit 1
	fi

# Write connection script
	echo "Starting pppd..."
	cat << SCRIPTEOF > /tmp/chat_irda_gprs
	ABORT NOCARRIER
	ABORT BUSY
	ABORT ERROR
	'' ATZ
	OK 'AT+CGDCONT=1,"IP","$APN"'
	OK ATDT$NUMBER
SCRIPTEOF

# Connect
	if
	    ! pppd crtscts lock asyncmap 0 modem usepeerdns nodetach defaultroute user $USER password $PASS $IRCOMMDEV 115200 connect '/usr/sbin/chat -t 60 -f /tmp/chat_irda_gprs' &
	then
	    echo "pppd could not setup modem!" >&2
	    exit 1
	fi
	PPPPID=$!

	echo "Give it some time to boot..."
	sleep 10

# Set up routes
	echo "Setting up routes..."
	route del default
	route add -net 10.10.10.0 netmask 255.255.255.0 dev ppp0
	route add default gw 10.10.10.10
	cp /etc/ppp/resolv.conf /etc/resolv.conf
	echo -n "Press ENTER to shutdown... "
	read TMP
	kill $PPPPID

else
	echo "usage: $0 username password APN [number]"
fi