#!/bin/sh

# This is an amateur script to send mixmaster messages with
# OpenPGP PGP/inline encrypted bodies with Sylpheed-Claws
# from Kai Raven <kairaven@arcor.de> / OpenPGP: D6E995A0.
# Maybe somebody with skills in scripting or graphical GUI design can
# make a better one and/or a nice client.
# License: GPL
#
# You need:
#
# Sylpheed-Claws
# http://claws.sylpheed.org/
#
# a mail server to send Mixmaster messages. You can use Mixmaster's own mail
# sending capabilities, but than you loose additional encryption and encrypted transport
# of your mail server password, because Mixmaster offers only plaintext LOGIN and AUTH. 
# 
# Mixmaster
# http://mixmaster.sourceforge.net/
# and in Mixmaster's configuration file ~/.mixmaster/mix.cfg
# PGPPUBRING	   /path/to/.gnupg/pubring.gpg
# PGPSECRING    /path/to/.gnupg/secring.gpg
# CHAIN *...,fromremailer   # exit remailer, which does allow from: headers
#
# Xdialog
# http://xdialog.dyns.net/
#
# GnuPG
# http://www.gnupg.org/
#
# a temp dir with tmpfs like this one (from fstab) or use simply /tmp
# none                    /tmp/remail          tmpfs   defaults,size=1m       0 0
#
# Usage:
# 1. Save the script as "syl-mixmaster-pgpinline" in your path
# 2. Make an action in Sylpheed-Claws: Configuration -> Actions:
#    Menu name: Mixmaster/Mixmaster-PGPinline
#    Command line: |syl-mixminion-pgpinline
# 3. Write a new message and choose Tools -> Actions -> Mixmaster ->Mixmaster-PGPinline

MIXTMP="/tmp/remail"
SYLTMP="$MIXTMP/syltmp"
MIXP="$HOME/.mixmaster/mixmaster"

# ask for message headers, Sylpheed can't supply
HEADER=`Xdialog	--stdout --separator "|" \
		--title "Mixmaster - PGPinline Ciphertext" --buttons-style text \
		--left --ok-label Send --cancel-label Abort \
		--3inputsbox "Fill in your pseudonym, recipient's e-mail address and subject" 0 0 \
                 "Pseudonym (nick's firstname surname):" "" \
		 "Recipient's e-mail address:" "" \
		 "Subject:" "" \
		--no-close --no-cancel --no-buttons --infobox "Done" 0 0 1`

ret=$?

case $ret in
	0)
		FROM=`echo $HEADER | awk --source 'BEGIN { FS="|" }' --source '{ print $1 }'` && echo From: $FROM > $SYLTMP
		TO=`echo $HEADER | awk --source 'BEGIN { FS="|" }' --source '{ print $2 }'` && echo To: $TO >> $SYLTMP
    		SUBJ=`echo $HEADER | awk --source 'BEGIN { FS="|" }' --source '{ print $3 }'` && echo Subject: $SUBJ >> $SYLTMP
		;;
	1)
		shred -uz $MIXTMP/*
    		exit 1
		;;
	255)
		echo "Box closed."
		;;
esac

# content headers for special characters.
# comment, if you don't need them.
echo "Content-Type: text/plain; charset=UTF-8" >> $SYLTMP
echo "Content-Transfer-Encoding: 8bit" >> $SYLTMP

# get message body from Sylpheed and encrypt it with GnuPG
echo "" >> $SYLTMP
cat - | gpg -r $TO --encrypt >> $SYLTMP
echo "" >> $SYLTMP

# send n dummy messages before the real messages
# set NUMCOPIES n in mix.cfg
$MIXP -d

# send the OpenPGP encrypted Mixmaster message with (NUMCOPIES n) redundant copies. 
$MIXP $SYLTMP

# eliminate any evidence
shred -uz $SYLTMP

exit 0