#!/bin/bash

PIP='xxx.xxx.xxx.xxx'           # Palm's IP address
DEV=/dev/ttyUSB1              	# ttyUSB Port for comms
PPPD=/usr/sbin/pppd		# where is pppd?
BAUD=57600			# BPS Rate for connection
PSTR="Product=Palm Handheld"    # String present when palm is attached

# Detect the IP interface and DNS
# This does not use NAT, but I am sure the NATterers will know what to do
#
IF=`/sbin/ifconfig eth0 | grep 'inet addr'`
IP=`echo "$IF" | sed "s/^.*addr://" | cut -f1 -d' '`
MASK=`echo "$IF" | sed "s/^.*Mask://" | cut -f1 -d' '`
DNS=`cat /etc/resolv.conf  | grep nameserver | head -1 | sed "s/nameserver //"`
OPT="$BAUD crtscts $IP:$PIP ms-dns $DNS"
OPT="$OPT nopersist noauth passive asyncmap 0"

echo "Listening for palm connection..."
while true; do
  PDEV=`cat /proc/bus/usb/devices`
  if echo "$PDEV" | grep "$PSTR" > /dev/null; then	# Palm wakeup
    sleep 2						# wait a bit
    CHR=""
    FUSR=`/usr/bin/fuser $DEV`
    if [ -z "$FUSR" ]; then      	# Anyone else out there?
      CHR=`head -c1 $DEV`		# read a character from the device
    fi
    if [ "$CHR" = "~" ]; then		# Initial character for PPP is a tilde
      echo "Palm wants to PPP"
      PDEVT=`echo "$PDEV" | grep -B4 "$PSTR"`
      PDEV_T=`echo "$PDEVT" | grep "^T:"`
      echo "$PDEV_T"			# some verbosity
      sleep 2

      echo executing cmd: $PPPD $DEV $OPT

      $PPPD $DEV $OPT 			# exec pppd
    else
      echo "Palm is HotSynching"
    fi
    while echo "$PDEV" | grep "$PSTR" > /dev/null; do
      PDEV=`cat /proc/bus/usb/devices`
      sleep 1				# Just wait for device to go away
    done
    if [ "$CHR" = "~" ]; then
      echo "Done. Killing pppd..."	# Kill off our pppd
      killall pppd
    fi
    echo "Listening for palm connection..."
  fi
  sleep 1
done