#!/bin/bash
#
# Intercom - Script to control access to Asterisk Intercom, by K0KN 8/2015
#
# Ext numbers in list below will be allowed to use intercom
# 
# Extension numbers in text file should be one per line, no whitespaces or blank lines
# Filename example, intercom.900 would be used to control access to intercom on ext 900
#
# Asterisk extension.conf sample dialplan:
#exten=> *75900,1,System(rm -f /dev/shm/intercom.${EXTEN:3})
#exten=> *75900,n,System(/home/kyle/intercom ${EXTEN:3} ${CALLERID(num)})
#exten=> *75900,n,Set(intercomok=${STAT(e,/dev/shm/intercom.${EXTEN:3})})
#exten=> *75900,n,NoOp(${intercomok})
#exten=> *75900,n,GotoIf($["${intercomok}" = "1"]?dialit:denied)
#exten=> *75900,n(dialit),System(/home/kyle/logit Intercom ${CALLERID(num)} ${EXTEN:3} )
#exten=> *75900,n(dialit),SIPAddHeader(Alert-Info: info=alert-autoanswer)
#exten=> *75900,n(dialit),Dial(SIP/${EXTEN})
#exten=> *75900,n(denied),System(/home/kyle/logit Intercom-ATTEMPT-FAILED ${CALLERID(num)} ${EXTEN:3} )
#exten=> *75900,n(denied),Playback(feature-not-avail-line)
#exten=> *75900,n,Hangup

INTERCOMLIST=/home/kyle/intercom.$1
INTERCOM=/dev/shm/intercom.$1

if [ "$1" == "" -o "$2" == "" ] ; then
echo "Usage = intercom [called#] [calling#]" ; exit
fi

if [ -e "$INTERCOM" ] ; then
rm -f "$INTERCOM"
fi

INTERCOMRESULTS=$(grep -i $2 $INTERCOMLIST)
echo "Allowed: $INTERCOMRESULTS"
if [ -n "$INTERCOMRESULTS" ] ; then
touch "$INTERCOM"
fi

exit 0