#!/bin/sh
#
# $Id$
# written by Jan Kratochvil <short@ucw.cz>
#
# Note to users of:
#       Linux running INSIDE VMWare (e.g. on Win32 machine)
#   and internet connection through local ethernet card:
# You MUST enable masquerading (NAT) for your Communicator's IP address!
#   iptables -t nat -F
#   iptables -t nat -A POSTROUTING --source 192.168.90.1 -j MASQUERADE
# (replace 192.168.90.1 by your $NOKIA9K setting below, if you change it)
#  - problem investigation by courtesy of Hussain Akbar <Hussain@systemsltd.com>


# IP address for N9K, "192.168.90.1" if not provided (either here or from
# some ~/.profile etc.)
#NOKIA9K=

# Nameserver for N9K, taken from /etc/resolv.conf if not provided
#NS=

# Serial port with attached N9K, default is /dev/ttyS1 (AKA COM2:)
#PORT=/dev/ttyS1

# Nokia baudrate, usually 19200 or 38400, default is 19200
#NOKIABAUD=19200

# No user-servicable parts below!

pid="/var/run/ppp9k.pid"
if [ -f "$pid" ];then
	if kill -0 `head -n 1 "$pid"` 2>/dev/null;then
		echo "Killing previous ppp9k on PID(s):" `cat "$pid"`
		kill `cat "$pid"`
		rm -f "$pid"
		exit 0
	else
		echo "Removing state lock of PID(s):" `cat "$pid"`
		rm -f "$pid"
	fi
fi

IP="${NOKIA9K:-192.168.90.1}"
NS="`grep '^nameserver' /etc/resolv.conf|head -n 1|cut -f 2 -d ' '`"
NS="${NS:-127.0.0.1}"
if [ "$NS" = localhost -o "${NS#127.}" != "$NS" ];then NS="`hostname -f`";fi
PORT="${PORT:-ttyS1}"
if [ "${PORT#*/}" = "$PORT" ];then PORT="/dev/$PORT";fi
NOKIABAUD="${NOKIABAUD:-19200}"

# Some rules for the chat script:
# 9000i starts with: ATZ, AT&F  (the need for TIMEOUT 2, "-OK^M^J-AT&F")
# 9110  starts with:      AT&F
# user can have global     custom initialization string (need for one "OK^M^J")
# user can have connection custom initialization string (need for one "OK^M^J")

(trap "" HUP
	while [ '!' -f "$pid" ];do sleep 1;done
	me="`cat "$pid"`"
	while :;do
		pppd "$PORT" "$NOKIABAUD" modem lock -crtscts xonxoff :$IP asyncmap 0 ms-dns "$NS" \
			connect 'chat -v                              \
				"TIMEOUT" "86400"                     \
				"AT"      "\c"                        \
				"TIMEOUT" "2"                         \
				"&F-OK^M^J-AT&F" "OK^M^JOK^M^JOK^M^J" \
				"TIMEOUT" "20"                        \
				"ATD"     "CONNECT^M^J"               \
				' \
			-ccp nodefaultroute proxyarp lcp-echo-interval 30 lcp-echo-failure 2 lcp-max-configure 30 -detach \
			-chap noauth "$@" &
		echo -e "$me\n$!" >"$pid"
		wait
		echo "$me" >"$pid"
		sleep 10
	done) </dev/null &>/dev/null &

he="$!"
echo "$he" >"$pid"
echo "Starting up: PID=$he, port=$PORT, baud=$NOKIABAUD, remoteIP=$IP, nameserver=$NS"