#!/bin/sh
# This script has been written by Dave Mielke <dave@mielke.cc>. It's a light 
# weight, text mode, Bluetooth PIN helper script. Its dependencies are:
# *  /bin/sh  The standard system command shell.
# *  open     A command which opens a free virtual terminal.
# *  dialog   A command which presents a text-mode dialog.
#
# The file /etc/bluetooth/pins is searched for a line corresponding to the 
# Bluetooth address of the device. Each line of this file should contain the
# address of a device and its PIN, in that order, separated by space. If the
# address is found then the corresponding PIN is automatically supplied. If
# it's not found then the user is prompted via a text-mode dialog in a free 
# virtual terminal. The console automatically returns to the original virtual
# terminal as soon as the PIN is entered.

pinsFile="/etc/bluetooth/pins"
pinLimit=16

[ "${#}" -gt 0 ] && {
   direction="${1}"
   shift

   [ "${#}" -gt 0 ] && {
      address="${1}"
      shift

      if [ "${#}" -gt 0 ]
      then
         name="${1}"
         shift
      else
         name=""
      fi

      [ -f "${pinsFile}" -a -r "${pinsFile}" ] && exec <"${pinsFile}" && {
         while read a p x
         do
            [ "${a}" = "${address}" ] && {
               echo "PIN:${p}"
               exit 0
            }
         done
      }

      if [ "${direction}" = "out" ]
      then
         adjective="outgoing"
         preposition="to"
      else
         adjective="incoming"
         preposition="from"
      fi

      time="$(date '+%Y-%m-%d@%H:%M:%S')"
      pin="$(open 3>&1 -s -w -- dialog --output-fd 3 --clear --cr-wrap --title "Bluetooth PIN Prompt" --max-input "${pinLimit}" --inputbox "${time}\n\nEnter PIN for ${adjective} Bluetooth connection ${preposition} ${name}[${address}]" 0 0 "")"
      [ -n "${pin}" ] && {
         echo "PIN:${pin}"
	 exit 0
      }
   }
}

echo ERR
exit 0