#!/usr/bin/bash

if [ $(/usr/bin/id -u) != 0 ]; then echo "only root can do that"; exit 2; fi

#***************************************************************************
# This file is part of the CRYPTO BONE
# File     : sendmessage 
# Version  : 1.5 (external cryptobone)
# License  : BSD
# Date     : Wednesday, 1 March 2023
# Contact  : Please send enquiries and bug-reports to innovation@senderek.ie
#
#
# Copyright (c) 2015-2023
#	Ralf Senderek, Ireland.  All rights reserved. (https://senderek.ie)
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
# 3. All advertising materials mentioning features or use of this software
#    must display the following acknowledgement:
#	   This product includes software developed by Ralf Senderek.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND  ANY EXPRESS OR 
# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE  IMPLIED WARRANTIES 
# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  
# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 
# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 
# OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 
# WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
# POSSIBILITY OF SUCH DAMAGE.
#
#****************************************************************************

# sends a message out, if it is encrypted
# $1 from  $2 to

SOCK=/usr/lib/cryptobone/ext/secrets.sock

function looks_like_email {

      if [[ $1 = @([0-9A-Za-z])+([0-9A-Za-z\.-])\@@([0-9A-Za-z])+([0-9A-Za-z\.-])\.@([ 0-9A-Za-z])+([0-9A-Za-z]) ]] 
      then
           return 0
      fi
      return 0
}

if [ $# -gt 1 ]
then
     SENDER="none"
     RECIPIENT="none"
     RES=$(echo check /usr/lib/cryptobone/ext/cryptobone/encryptedmessage.asc | socat -t15 - UNIX-connect:$SOCK 2> /dev/null)
     if [[ "x$RES" = "xAES encrypted data" ]]
     then
          if looks_like_email $1
	  then
               SENDER=$1
	       if looks_like_email $2
	       then
                    RECIPIENT=$2
                    RES=$(echo get-element smtpserver | socat -t15 - UNIX-connect:$SOCK 2> /dev/null)
                    if [ ${RES}x != "nonex" ]
                    then
                          echo "using msmtp"
                          echo -e 'Subject: cryptobone message\n\n' > /usr/lib/cryptobone/ext/cryptobone/message
                          /usr/bin/cat /usr/lib/cryptobone/ext/cryptobone/encryptedmessage.asc >> /usr/lib/cryptobone/ext/cryptobone/message
                          chmod 600 /usr/lib/cryptobone/ext/cryptobone/message
                          /usr/bin/cat /usr/lib/cryptobone/ext/cryptobone/message | /usr/bin/msmtp -C/usr/lib/cryptobone/ext/.exmsmtprc -d -- "$RECIPIENT" > /dev/shm/EXRAM/msmtpout 2> /dev/shm/EXRAM/msmtperr
                    else
                          echo "using sendmail"
                          /usr/sbin/sendmail  -f "$SENDER" "$RECIPIENT" < /usr/lib/cryptobone/ext/cryptobone/encryptedmessage.asc
                    fi
                    echo "MAIL SENT"
                    exit 0
	       fi	
	  fi
	  exit 2
     fi
     exit 3
else
     exit 1
fi