#!/bin/sh
# This is an example how to use an eventhandler with smsd.
# $1 is the type of the event wich can be SENT, RECEIVED, FAILED or REPORT.
# $2 is the filename of the sms.
# $3 is the message id. Only used for SENT messages with status report.

#The next line changes the file attributes so that everybody can read
#received SM
#if [ "$1" = "RECEIVED" ]; then
#  chmod a+r $2
#fi


#This sends all received SM to an eMail receiver:
#if [ "$1" = "RECEIVED" ]; then
#  /usr/sbin/sendmail username@localhost <$2
#fi

#This sends all received SM to eMail receiver. The recipient address 
#must be the first word of the SM.

#if [ "$1" = "RECEIVED" ]; then
#  receiver=`cat $2 | grep '^.*@.*' | sed -n 1p | cut -f1 -d' '`
#  if [ $receiver ]; then
#    /usr/sbin/sendmail $receiver < $2
#  fi
#fi

#This forwards all received SM to another mobile phone:
#if [ "$1" = "RECEIVED" ]; then
#  FROM=`formail -zx From: <$2`
#  formail -f -I "To: 491721234567" <$2 >$2.forward
#  echo "from $FROM" >> $2.forward
#  mv $2.forward /var/spool/sms/outgoing
#fi

#The following code concatenates multipart text messages
if [ "$1" = "RECEIVED" ]; then
  if grep "UDH-DATA: 05 00 03" $2 >/dev/null; then
    if grep "Alphabet: ISO" $2 >/dev/null || grep "Alphabet: GSM" $2 >/dev/null; then
      # This is a multipart text message
      FROM=`formail -zx From: <$2`
      UDHDATA=`formail -zx UDH-DATA: <$2`
      # Extract information from UDH using awk to convert hex to dec
      MSGID=`echo "$UDHDATA" | awk '{printf "%d",strtonum("0x"$4)}'`
      PARTS=`echo "$UDHDATA" | awk '{printf "%d",strtonum("0x"$5)}'`
      PART=`echo "$UDHDATA" | awk '{printf "%d",strtonum("0x"$6)}'`
      # Rename the file
      mv $2 "$FROM.$MSGID.$PART"
      # Check if all parts have been received
      received=`ls -1 "$FROM.$MSGID."* | wc -l`
      if [ "$PARTS" -eq "$received" ]; then
        # Concatenate all parts
        # copy header from last part into a new file
        formail -X "" <$FROM.$MSGID.$PART >$2.concatenated
        echo "" >>$2.concatenated
        # add the text of each part
        counter=1
        while [ "$counter" -le "$PARTS" ]; do
          sed -e '1,/^$/ d' <$FROM.$MSGID.$counter >>$2.concatenated
          rm $FROM.$MSGID.$counter
          counter=`expr $counter + 1`
        done
      fi
    fi
  fi
fi