#!/bin/sh
#
# Configure a machine without exim installed as a mail server receiving
# email using SMTP via Tor.

if dpkg -l exim4-config > /dev/null ; then
    echo "******************************************************************"
    echo "* Unable to set up SMTP over Tor, exim4-config already installed *"
    echo "* Purge the package and try again, or                            *"
    echo "* run "dpkg-reconfigure exim4-config" to configure manually.     *"
    echo "******************************************************************"
    exit 1
fi

DEBIAN_FRONTEND=noninteractive apt-get install -y tor
torhsdir=$(awk '/^HiddenServiceDir (.*) *$/ { print $2 }' /etc/tor/torrc)
if [ -e "$torhsdir/hostname" ] ; then
   torhsname=$(cat "$torhsdir/hostname")
else
    echo "*******************************************************************"
    echo "* Unable to set up SMTP over TOR.  There is no Tor hidden service *"
    echo "* name in $torhsdir           *"
    echo "*******************************************************************"
    echo "Please add lines like this to /etc/tor/torrc:"
    echo
    echo "HiddenServiceDir /var/lib/tor/hidden_service/"
    echo "HiddenServicePort 25 127.0.0.1:25"
    mkdir /var/lib/tor/hidden_service
    chown debian-tor:debian-tor /var/lib/tor/hidden_service
    exit 1
fi

cat <<EOF | debconf-set-selections
exim4-config	exim4/dc_eximconfig_configtype	select	internet site; mail is sent and received directly using SMTP
exim4-config	exim4/dc_local_interfaces	string	127.0.0.1 ; ::1
exim4-config	exim4/dc_other_hostnames	string	$torhsname
exim4-config	exim4/use_split_config	boolean	true
EOF

DEBIAN_FRONTEND=noninteractive apt-get install -y exim4