freedombone/src/freedombone-controlpanel

#!/bin/bash
#  _____               _           _
# |   __|___ ___ ___ _| |___ _____| |_ ___ ___ ___
# |   __|  _| -_| -_| . | . |     | . | . |   | -_|
# |__|  |_| |___|___|___|___|_|_|_|___|___|_|_|___|
#
#                              Freedom in the Cloud
#
# Administrator control panel for the Freedombone system
#
# License
# =======
#
# Copyright (C) 2015-2018 Bob Mottram <bob@freedombone.net>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

PROJECT_NAME='freedombone'

export TEXTDOMAIN=${PROJECT_NAME}-controlpanel
export TEXTDOMAINDIR="/usr/share/locale"

if [[ $USER != 'root' ]]; then
    # show the user version of the control panel
    #${PROJECT_NAME}-controlpanel-user
    controluser
    exit 0
fi

function please_wait {
        local str width height length

        width=$(tput cols)
        height=$(tput lines)
        str=$"Please wait"
        length=${#str}
        clear
        tput cup $((height / 2)) $(((width / 2) - (length / 2)))
        echo "$str"
        tput cup $((height * 3 / 5)) $(((width / 2)))
        echo -n ''
}

please_wait

# Start including files

source /usr/local/bin/${PROJECT_NAME}-vars

UTILS_FILES="/usr/share/${PROJECT_NAME}/utils/${PROJECT_NAME}-utils-*"
for f in $UTILS_FILES
do
    source "$f"
done

APP_FILES="/usr/share/${PROJECT_NAME}/apps/${PROJECT_NAME}-app-*"
for f in $APP_FILES
do
    source "$f"
done

# End including files

COMPLETION_FILE="$HOME/${PROJECT_NAME}-completed.txt"
SELECTED_USERNAME=
ADMIN_USER=
UPGRADE_SCRIPT_NAME="${PROJECT_NAME}-upgrade"
UPDATE_DATE_SCRIPT=/usr/bin/updatedate

# Minimum number of characters in a password
MINIMUM_PASSWORD_LENGTH=$(grep 'MINIMUM_PASSWORD_LENGTH=' "/usr/share/${PROJECT_NAME}/utils/${PROJECT_NAME}-utils-passwords" | head -n 1 | awk -F '=' '{print $2}')

# Mumble
MUMBLE_PORT=64738
MUMBLE_ONION_PORT=8095

SSH_PORT=2222

# outgoing SMTP proxy
SMTP_PROXY_ENABLE=$'no'
SMTP_PROXY_PROTOCOL='smtps'
SMTP_PROXY_SERVER='mail.myispdomain'
SMTP_PROXY_PORT=465
SMTP_PROXY_USERNAME=''
SMTP_PROXY_PASSWORD=''

WIFI_INTERFACE=wlan0
WIFI_SSID=
WIFI_TYPE='wpa2-psk'
WIFI_PASSPHRASE=
WIFI_HOTSPOT='no'
WIFI_NETWORKS_FILE="$HOME/${PROJECT_NAME}-wifi.cfg"

USB_DRIVE=sdb
# get default USB from config file
CONFIGURATION_FILE="$HOME/${PROJECT_NAME}.cfg"

read_config_param WIFI_HOTSPOT
read_config_param WIFI_INTERFACE
read_config_param WIFI_TYPE
read_config_param WIFI_SSID
read_config_param WIFI_PASSPHRASE
read_config_param SSH_PORT
read_config_param SMTP_PROXY_ENABLE
read_config_param SMTP_PROXY_PROTOCOL
read_config_param SMTP_PROXY_SERVER
read_config_param SMTP_PROXY_PORT
read_config_param SMTP_PROXY_USERNAME
read_config_param SMTP_PROXY_PASSWORD
read_config_param USB_DRIVE
read_config_param MY_USERNAME
read_config_param ONION_ONLY
if [[ $USB_DRIVE == *"dev"* ]]; then
    USB_DRIVE=$(echo ${USB_DRIVE} | awk -F '/' '{print $3}' | sed 's|1||g' | sed 's|2||g')
fi

function any_key {
    echo ''
    # shellcheck disable=SC2034
    read -n1 -rsp $"Press any key to continue..." key
}

function reset_password_tries {
    passwords_select_user
    if [ ! "$SELECTED_USERNAME" ]; then
        return
    fi
    pam_tally --user "$SELECTED_USERNAME" --reset
    dialog --title $"Reset password tries" \
           --msgbox $"Password tries have been reset for $SELECTED_USERNAME" 6 60
}

function check_for_updates {
    if [ ! -f "/etc/cron.weekly/$UPGRADE_SCRIPT_NAME" ]; then
        dialog --title $"Check for updates" \
               --msgbox $"Upgrade script was not found" 6 40
        return
    fi

    clear
    /etc/cron.weekly/$UPGRADE_SCRIPT_NAME
    any_key
}

function add_user {
    data=$(mktemp 2>/dev/null)
    dialog --backtitle $"Freedombone Control Panel" \
           --title $"Add new user" \
           --form "\\n" 8 60 3 \
           $"Username:" 1 1 "" 1 28 16 15 \
           $"ssh public key (optional):" 2 1 "" 2 28 40 10000 \
           2> "$data"
    sel=$?
    case $sel in
        1) rm -f "$data"
           return;;
        255) rm -f "$data"
             return;;
    esac
    new_user_username=$(sed -n 1p < "$data")
    new_user_ssh_public_key=$(sed -n 2p < "$data")
    rm -f "$data"
    if [ ${#new_user_username} -lt 2 ]; then
        dialog --title $"New username" \
               --msgbox $"No username was given" 6 40
        return
    fi
    if [[ "$new_user_username" == *" "* ]]; then
        dialog --title $"Invalid username" \
               --msgbox $"The username should not contain any spaces" 6 40
        return
    fi
    if [ ${#new_user_ssh_public_key} -lt 20 ]; then
        clear
        "${PROJECT_NAME}-adduser" "$new_user_username"
        any_key
    else
        if [[ "$new_user_ssh_public_key" == "ssh-"* ]]; then
            clear
            "${PROJECT_NAME}-adduser" "$new_user_username" "$new_user_ssh_public_key"
            any_key
        else
            dialog --title $"ssh public key" \
                   --msgbox $"This does not look like an ssh public key" 6 40
        fi
    fi
}

function pad_string {
    echo -n -e "$1" | sed -e :a -e 's/^.\{1,25\}$/& /;ta'
}

function show_tor_bridges {
    if ! grep -q "#BridgeRelay" /etc/tor/torrc; then
        if grep -q "BridgeRelay 1" /etc/tor/torrc; then
            read_config_param 'TOR_BRIDGE_PORT'
            read_config_param 'TOR_BRIDGE_NICKNAME'
            if [ ${#TOR_BRIDGE_NICKNAME} -gt 0 ]; then
                W+=($"Your Tor Bridge" "$(get_ipv4_address):${TOR_BRIDGE_PORT} ${TOR_BRIDGE_NICKNAME}")
            fi
        fi
    fi
    bridges_list=$(grep "Bridge " /etc/tor/torrc | grep -v '##')
    if [ ${#bridges_list} -gt 0 ]; then
        for i in "${bridges_list[@]}"
        do
            bridgestr=$(i//Bridge /)
            W+=($"Tor Bridge" "$bridgestr")
        done
    fi
}

function show_domains {
    read_config_param "DEFAULT_DOMAIN_NAME"

    while true
    do
        W=()

        W+=("IPv4" "$(get_ipv4_address) / $(get_external_ipv4_address)")
        ipv6_address="$(get_ipv6_address)"
        if [ ${#ipv6_address} -gt 0 ]; then
            W+=("IPv6" "${ipv6_address}")
        fi

        if [ -f /etc/ssh/ssh_host_rsa_key.pub ]; then
            W+=("ssh rsa sha256" "$(awk '{print $2}' /etc/ssh/ssh_host_rsa_key.pub | base64 -d | sha256sum -b | awk '{print $1}' | xxd -r -p | base64 | sed 's|=||g')")
        fi
        if [ -f /etc/ssh/ssh_host_ed25519_key.pub ]; then
            W+=("ssh ed25519 sha256" "$(awk '{print $2}' /etc/ssh/ssh_host_ed25519_key.pub | base64 -d | sha256sum -b | awk '{print $1}' | xxd -r -p | base64 | sed 's|=||g')")
        fi

        if grep -q "ssh onion domain" "$COMPLETION_FILE"; then
            domain_onion=$(grep 'ssh onion domain' "${COMPLETION_FILE}" | awk -F ':' '{print $2}')
            W+=("ssh" "${DEFAULT_DOMAIN_NAME} / ${domain_onion}")
        fi
        if grep -q "email onion domain" "$COMPLETION_FILE"; then
            domain_onion=$(grep 'email onion domain' "${COMPLETION_FILE}" | awk -F ':' '{print $2}')
            W+=("Email" "${DEFAULT_DOMAIN_NAME} / ${domain_onion}")
        fi
        if grep -q "sks onion domain" "$COMPLETION_FILE"; then
            read_config_param "KEYSERVER_DOMAIN_NAME"
            domain_onion=$(grep 'sks onion domain' "${COMPLETION_FILE}" | awk -F ':' '{print $2}')
            W+=("SKS" "${KEYSERVER_DOMAIN_NAME} / ${domain_onion}")
        fi

        INTRODUCER_FILENAME=/home/tahoelafs/data/private/introducer.furl
        if [ -f $INTRODUCER_FILENAME ]; then
            W+=("Tahoe-LAFS" "$(cat $INTRODUCER_FILENAME)")
        fi

        show_tor_bridges

        # shellcheck disable=SC2068
        for app_name in ${APPS_INSTALLED_NAMES[@]}
        do
            if ! grep -q "SHOW_ON_ABOUT=1" "/usr/share/${PROJECT_NAME}/apps/${PROJECT_NAME}-app-${app_name}"; then
                continue
            fi

            # handle the foibles of capitalisation
            if ! grep -q "${app_name} domain" "$COMPLETION_FILE"; then
                app_name_upper=$(echo "${app_name}" | awk '{print toupper($0)}')
                if grep -q "${app_name_upper} domain" "$COMPLETION_FILE"; then
                    app_name=${app_name_upper}
                else
                    app_name_first_upper="$(tr '[:lower:]' '[:upper:]' <<< "${app_name:0:1}")${app_name:1}"
                    if grep -q "${app_name_first_upper} domain" "$COMPLETION_FILE"; then
                        app_name=${app_name_first_upper}
                    fi
                fi
            fi

            if [ ${#app_name} -gt 0 ]; then
                icann_address=$(get_app_icann_address "$app_name")
                if grep -q "SHOW_ICANN_ADDRESS_ON_ABOUT=0" "/usr/share/${PROJECT_NAME}/apps/${PROJECT_NAME}-app-${app_name}"; then
                    icann_address='-'
                fi
                if [[ "$ONION_ONLY" != 'no' ]]; then
                    if [[ "${icann_address}" != "${LOCAL_NAME}.local" ]]; then
                        icann_address='-'
                    fi
                fi
                onion_address=$(get_app_onion_address "$app_name")
                if [ ${#onion_address} -eq 0 ]; then
                    onion_address="-"
                fi

                if [[ "${icann_address}" != '-' ]]; then
                    if [[ "${onion_address}" != '-' ]]; then
                        W+=("${app_name}" "${icann_address} / ${onion_address}")
                    else
                        W+=("${app_name}" "${icann_address}")
                    fi
                else
                    W+=("${app_name}" "${onion_address}")
                fi

                if grep -q "mobile${app_name} onion domain" "$COMPLETION_FILE"; then
                    onion_address=$(get_app_onion_address "${app_name}" "mobile")
                    if [[ "${icann_address}" != '-' ]]; then
                        W+=("${app_name} (mobile)" "${icann_address} / ${onion_address}")
                    else
                        W+=("${app_name} (mobile)" "${onion_address}")
                    fi
                fi
            fi
        done

        if grep -q "rss reader domain" "$COMPLETION_FILE"; then
            if [ -d /var/lib/tor/hidden_service_ttrss ]; then
                domain_onion=$(cat /var/lib/tor/hidden_service_ttrss/hostname)
                W+=("RSS Reader" "${domain_onion}")
            fi
            if [ -d /var/lib/tor/hidden_service_mobilerss ]; then
                domain_onion=$(cat /var/lib/tor/hidden_service_mobilerss/hostname)
                W+=("RSS mobile" "${domain_onion}")
            fi
        fi

        width=$(tput cols)
        height=$(tput lines)

        # shellcheck disable=SC2068
        selected=$(dialog --backtitle $"Freedombone Control Panel" --title $"Domains" --menu $"Use Shift+cursors to select and copy onion addresses" $((height-4)) $((width-4)) $((height-4)) "${W[@]}" 3>&2 2>&1 1>&3)
        if [ ! "$selected" ]; then
            break
        fi
        # obtain the addresses from the key by itterating through
        # the array. This is quite crude and maybe there's a better way
        key_found=
        selected_addresses=
        for key in "${W[@]}";
        do
            if [ $key_found ]; then
                selected_addresses="$key"
                break
            fi
            if [[ "$key" == "$selected" ]]; then
                key_found=1
            fi
        done
        # Was the key matched?
        if [ ! "$selected_addresses" ]; then
            break
        fi
        # addresses were found - is this an onion?
        if [[ "$selected_addresses" != *".onion"* ]]; then
            continue
        fi
        # There are two forms of addresses: "x / y.onion" and "x.onion"
        if [[ "$selected_addresses" == *'/'* ]]; then
            onion_addr=$(echo "$selected_addresses" | awk -F '/' '{print $2}' | awk -F ' ' '{print $1}')
        else
            onion_addr="$selected_addresses"
        fi
        # show the onion address as a QR code
        clear
        echo "${selected}: ${onion_addr}"
        echo -n "$onion_addr" | qrencode -t UTF8
        any_key
    done
}

function show_users {
    echo 'Users'
    echo '====='
    echo ''
    echo -n -e "$(pad_string 'Name')"
    echo -n -e "$(pad_string 'Data')"
    echo ''
    echo '----------------------------------'
    for d in /home/*/ ; do
        USRNAME=$(echo "$d" | awk -F '/' '{print $3}')
        if [[ $(is_valid_user "$USRNAME") == "1" ]]; then
            echo -n -e "$(pad_string "${USRNAME}")"

            # size of the home directory
            du -s -h "/home/${USRNAME}" | awk -F ' ' '{print $1}'
        fi
    done
    echo ''
}

function show_tahoelafs {
    if [ ! -f /home/tahoelafs/storage/private/storage.furl ]; then
        return
    fi
    echo 'Tahoe-LAFS Storage Node'
    echo '======================='
    echo ''
    echo "Hostname:   $(get_tahoelafs_storage_hostname)"
    echo "Public key: $(get_tahoelafs_public_key)"
    echo "Nickname:   $(get_tahoelafs_nick)"
    echo "FURL:       $(get_tahoelafs_furl)"
    echo ''
}

function show_about {
    detect_apps
    get_apps_installed_names
    show_domains
}

function select_user {
    SELECTED_USERNAME=

    # shellcheck disable=SC2207
    users_array=($(ls /home))

    delete=(git)
    # shellcheck disable=SC2068
    for del in ${delete[@]}
    do
        # shellcheck disable=SC2206
        users_array=(${users_array[@]/$del})
    done

    i=0
    W=()
    name=()
    # shellcheck disable=SC2068
    for u in ${users_array[@]}
    do
        if [[ $(is_valid_user "$u") == "1" ]]; then
            i=$((i+1))
            W+=("$i" "$u")
            name+=("$u")
        fi
    done

    if [ $i -eq 1 ]; then
        SELECTED_USERNAME="${name[0]}"
    else
        # shellcheck disable=SC2068
        user_index=$(dialog --backtitle $"Freedombone Control Panel" --title $"Select User" --menu $"Select one of the following:" 24 40 17 ${W[@]} 3>&2 2>&1 1>&3)

        # shellcheck disable=SC2181
        if [ $? -eq 0 ]; then
            SELECTED_USERNAME="${name[$((user_index-1))]}"
        fi
    fi
}

function delete_user {
    select_user
    if [ ! "$SELECTED_USERNAME" ]; then
        return
    fi
    if grep -Fxq "Admin user:$SELECTED_USERNAME" "$COMPLETION_FILE"; then
        dialog --title $"Administrator user" \
               --msgbox $"You can't delete the administrator user" 6 40
        return
    fi
    clear
    "${PROJECT_NAME}-rmuser" "$SELECTED_USERNAME"
    any_key
}

function configure_remote_backups {
    if ! grep -Fxq "Admin user:$ADMIN_USER" "$COMPLETION_FILE"; then
        dialog --title $"Administrator user" \
               --msgbox $"No Administrator user found. Check $COMPLETION_FILE" 6 40
        return
    fi
    if [ ${#ADMIN_USER} -lt 2 ]; then
        dialog --title $"Administrator user" \
               --msgbox $"Username not found" 6 40
        return
    fi
    if [ ! -d "/home/$ADMIN_USER" ]; then
        dialog --title $"Administrator user" \
               --msgbox $"Home directory not found" 6 40
        return
    fi
    if ! "${PROJECT_NAME}-remote" -u "$ADMIN_USER"; then
        any_key
    fi
}

function change_password {
    select_user
    if [ ! "$SELECTED_USERNAME" ]; then
        return
    fi

    dialog --title $"Change password" \
           --passwordbox $"New password for user $SELECTED_USERNAME" 8 40 2> "$data"
    newpassword=$(<"$data")
    rm -f "$data"
    if [ "${#newpassword}" -lt "${MINIMUM_PASSWORD_LENGTH}" ]; then
        dialog --title $"Change password" \
               --msgbox $"The password should be ${MINIMUM_PASSWORD_LENGTH} or more characters" 6 40
        return
    fi

    echo "$SELECTED_USERNAME:$newpassword"|chpasswd

    dialog --title $"Change password" \
           --msgbox $"Password for $SELECTED_USERNAME was changed" 6 40
}

function change_ssh_public_key {
    select_user
    if [ ! "$SELECTED_USERNAME" ]; then
        return
    fi

    if grep -Fxq "Admin user:$SELECTED_USERNAME" "$COMPLETION_FILE"; then
        dialog --title $"Change ssh public key" \
               --backtitle $"Freedombone Control Panel" \
               --defaultno \
               --yesno $"\\nThis is the administrator user.\\n\\nAre you sure you want to change the ssh public key for the administrator?" 10 60
        sel=$?
        case $sel in
            1) return;;
            255) return;;
        esac
    fi

    data=$(mktemp 2>/dev/null)
    dialog --title $"Change ssh public key for $SELECTED_USERNAME" \
           --backtitle $"Freedombone Control Panel" \
           --inputbox $"Paste the ssh public key below" 8 60 2>"$data"
    sel=$?
    case $sel in
        0)
            SSH_PUBLIC_KEY=$(<"$data")
            if [ "$SSH_PUBLIC_KEY" ]; then
                if [ ${#SSH_PUBLIC_KEY} -gt 5 ]; then
                    if [ -f "$SSH_PUBLIC_KEY" ]; then
                        if [ ! -d "/home/$SELECTED_USERNAME/.ssh" ]; then
                            mkdir "/home/$SELECTED_USERNAME/.ssh"
                        fi
                        cp "$SSH_PUBLIC_KEY" \
                           "/home/$SELECTED_USERNAME/.ssh/authorized_keys"
                        chown -R "$SELECTED_USERNAME":"$SELECTED_USERNAME" \
                              "/home/$SELECTED_USERNAME/.ssh"
                        dialog --title $"Change ssh public key" \
                               --msgbox $"ssh public key was installed" 6 40
                    else
                        if [[ "$SSH_PUBLIC_KEY" == "ssh-"* ]]; then
                            if [ ! -d "/home/$SELECTED_USERNAME/.ssh" ]; then
                                mkdir "/home/$SELECTED_USERNAME/.ssh"
                            fi
                            echo "$SSH_PUBLIC_KEY" > \
                                 "/home/$SELECTED_USERNAME/.ssh/authorized_keys"
                            chown -R "$SELECTED_USERNAME":"$SELECTED_USERNAME" \
                                  "/home/$SELECTED_USERNAME/.ssh"
                            dialog --title $"Change ssh public key" \
                                   --msgbox $"ssh public key was installed" 6 40
                        fi
                    fi
                fi
            fi
            ;;
    esac
    rm -f "$data"
}

function remove_user_from_mailing_list {
    select_user
    if [ ! "$SELECTED_USERNAME" ]; then
        return
    fi
    USER_MAILING_LISTS=$(grep '\[' "/home/$SELECTED_USERNAME/.procmailrc" | grep '\]' | awk -F '\[' '{print $2}' | awk -F '\\' '{print $1}')

    i=0
    W=()
    list_name=()
    while read -r listname; do
        i=$((i+1))
        W+=("$i" "$listname")
        list_name+=("$listname")
        echo "$listname"
    done <<< "$USER_MAILING_LISTS"

    i=$((i+1))
    W+=("$i" $"Exit back to user mainenance")

    # shellcheck disable=SC2068
    list_selected=$(dialog --default-item "$i" --backtitle $"Freedombone Control Panel" --title $"Remove a mailing list for $SELECTED_USERNAME" --menu $"Select one of the following:" 24 50 17 ${W[@]} 3>&2 2>&1 1>&3)

    # shellcheck disable=SC2181
    if [ $? -eq 0 ]; then # Exit with OK
        if [ "${list_selected}" -ne "${i}" ]; then
            remove_list_name="${list_name[$((list_selected-1))]}"

            # find the line number where the list is defined
            line_number=0
            i=0
            while read -r line
            do
                if [[ "$line" == *"\\[${remove_list_name}\\]"* ]]; then
                    line_number=${i}
                fi
                i=$((i+1))
            done < "/home/$SELECTED_USERNAME/.procmailrc"

            if [ ${line_number} -eq 0 ]; then
                # no match was found
                return
            fi

            # recreate the file
            if [ -f "/home/${SELECTED_USERNAME}/.procmailrc_new" ]; then
                rm "/home/${SELECTED_USERNAME}/.procmailrc_new"
            fi
            i=0
            clip=0
            while read -r line
            do
                i=$((i+1))
                if [ ${i} -gt $((line_number-1)) ]; then
                    if [ ${clip} -eq 0 ]; then
                        clip=1
                    fi
                    if [ ${clip} -eq 1 ]; then
                        if [ ${i} -lt $((line_number+2)) ]; then
                            continue
                        else
                            if [ ${#line} -lt 1 ]; then
                                clip=2
                                continue
                            fi
                            if [[ "$line" == ":"* || "$line" == "#"* ]]; then
                                clip=2
                            else
                                continue
                            fi
                        fi
                    fi
                fi

                echo "$line" >> "/home/${SELECTED_USERNAME}/.procmailrc_new"

                if [[ "$line" == *"\\[${remove_list_name}\\]"* ]]; then
                    line_number=${i}
                fi
            done < "/home/$SELECTED_USERNAME/.procmailrc"
            cp "/home/${SELECTED_USERNAME}/.procmailrc_new" "/home/${SELECTED_USERNAME}/.procmailrc"
            rm "/home/${SELECTED_USERNAME}/.procmailrc_new"
            chown "${SELECTED_USERNAME}":"${SELECTED_USERNAME}" "/home/${SELECTED_USERNAME}/.procmailrc"
            dialog --title $"Remove user from mailing list" \
                   --msgbox $"${SELECTED_USERNAME} has been removed from ${remove_list_name}" 6 50
        fi
    fi
}

function add_to_mailing_list {
    select_user
    if [ ! "$SELECTED_USERNAME" ]; then
        return
    fi
    data=$(mktemp 2>/dev/null)
    dialog --backtitle $"Freedombone Control Panel" \
           --title $"Subscribe $SELECTED_USERNAME to a mailing list" \
           --form $"You can either enter a subject or an email address\\n" 11 68 4 \
           $"List folder name:" 1 1 "" 1 35 26 25 \
           $"Name between [] on subject line:" 2 1 "" 2 35 26 25 \
           $"List email address:" 3 1 "" 3 35 26 25 \
           $"Public:" 4 1 $"yes" 4 35 4 25 \
           2> "$data"
    sel=$?
    case $sel in
        1)  rm -f "$data"
            return;;
        255) rm -f "$data"
             return;;
    esac
    LIST_NAME=$(sed -n 1p < "$data")
    LIST_SUBJECT=$(sed -n 2p < "$data")
    LIST_EMAIL=$(sed -n 3p < "$data")
    LIST_PUBLIC=$(sed -n 4p < "$data")

    if [ ${#LIST_PUBLIC} -lt 1 ]; then
        LIST_PUBLIC='no'
    fi
    if [[ $LIST_PUBLIC == $'y' || $LIST_PUBLIC == $'Y' || $LIST_PUBLIC == $'true' || $LIST_PUBLIC == $'True' || $LIST_PUBLIC == $'yes' || $LIST_PUBLIC == $'Yes' || $LIST_PUBLIC == $'YES' ]]; then
        LIST_PUBLIC='yes'
    else
        LIST_PUBLIC='no'
    fi
    if [ ${#LIST_NAME} -lt 2 ]; then
        dialog --title $"Add mailing list" \
               --msgbox $"No mailing list name was given" 6 40
        rm -f "$data"
        return
    fi
    if [ ${#LIST_SUBJECT} -lt 2 ]; then
        if [ ${#LIST_EMAIL} -lt 2 ]; then
            dialog --title $"Add mailing list" \
                   --msgbox $"No mailing list subject or address was given" 6 40
            rm -f "$data"
            return
        fi
    fi
    if [ ${#LIST_SUBJECT} -gt 1 ]; then
        "${PROJECT_NAME}-addlist" -u "$SELECTED_USERNAME" -l "$LIST_NAME" \
                       -s "$LIST_SUBJECT" --public "$LIST_PUBLIC"
    else
        if [[ "$LIST_EMAIL" != *"@"* || "$LIST_EMAIL" != *"."* ]]; then
            dialog --title $"Add mailing list" \
                   --msgbox $"Unrecognised email address" 6 40
            rm -f "$data"
            return
        else
            "${PROJECT_NAME}-addlist" -u "$SELECTED_USERNAME" -l "$LIST_NAME" \
                           -e "$LIST_EMAIL" --public "$LIST_PUBLIC"
        fi
    fi

    dialog --title $"Add mailing list" \
           --msgbox $"$LIST_NAME list was added" 6 40
    rm -f "$data"
}

function email_rule {
    select_user
    if [ ! "$SELECTED_USERNAME" ]; then
        return
    fi
    data=$(mktemp 2>/dev/null)
    dialog --backtitle $"Freedombone Control Panel" \
           --title $"Email rule for user $SELECTED_USERNAME" \
           --form "\\n" 9 65 4 \
           $"When email arrives from address:" 1 1 "" 1 35 24 28 \
           $"Move to folder:" 2 1 "" 2 35 24 28 \
           $"Public:" 3 1 $"no" 3 35 4 25 \
           2> "$data"
    sel=$?
    case $sel in
        1) rm -f "$data"
           return;;
        255) rm -f "$data"
             return;;
    esac
    RULE_EMAIL=$(sed -n 1p < "$data")
    RULE_FOLDER=$(sed -n 2p < "$data")
    RULE_PUBLIC=$(sed -n 3p < "$data")

    if [ ${#RULE_PUBLIC} -lt 1 ]; then
        RULE_PUBLIC='no'
    fi
    if [[ $RULE_PUBLIC == $'y' || $RULE_PUBLIC == $'Y' || $RULE_PUBLIC == $'true' || $RULE_PUBLIC == $'True' || $RULE_PUBLIC == $'yes' || $RULE_PUBLIC == $'Yes' || $RULE_PUBLIC == $'YES' ]]; then
        RULE_PUBLIC='yes'
    else
        RULE_PUBLIC='no'
    fi
    if [ ${#RULE_EMAIL} -lt 2 ]; then
        dialog --title $"Add email rule" \
               --msgbox $"No email address was given" 6 40
        rm -f "$data"
        return
    fi
    if [ ${#RULE_FOLDER} -lt 2 ]; then
        dialog --title $"Add email rule" \
               --msgbox $"No folder name was given" 6 40
        rm -f "$data"
        return
    fi
    if [[ "$RULE_EMAIL" != *"@"* || "$RULE_EMAIL" != *"."* ]]; then
        dialog --title $"Add email rule" \
               --msgbox $"Unrecognised email address" 6 40
        rm -f "$data"
        return
    fi

    "${PROJECT_NAME}-addemail" -u "$SELECTED_USERNAME" -e "$RULE_EMAIL" \
                   -g "$RULE_FOLDER" --public $RULE_PUBLIC
    dialog --title $"Add email rule" \
           --msgbox $"Email rule for $RULE_EMAIL was added" 6 40
    rm -f "$data"
}

function block_unblock_email {
    select_user
    if [ ! "$SELECTED_USERNAME" ]; then
        return
    fi
    blockstr=$"Block/Unblock email going to"
    data=$(mktemp 2>/dev/null)
    dialog --backtitle $"Freedombone Control Panel" \
           --title "$blockstr $SELECTED_USERNAME" \
           --form "\\n" 8 65 3 \
           $"When email arrives from address:" 1 1 "" 1 35 24 100 \
           $"Block it:" 2 1 "yes" 2 35 4 4 \
           2> "$data"
    sel=$?
    case $sel in
        1) rm -f "$data"
           return;;
        255) rm -f "$data"
             return;;
    esac
    BLOCK_EMAIL=$(sed -n 1p < "$data")
    BLOCK=$(sed -n 2p < "$data")
    rm -f "$data"
    if [ ${#BLOCK_EMAIL} -lt 2 ]; then
        dialog --title $"Block/Unblock an email" \
               --msgbox $"No email address was given" 6 40
        return
    fi
    if [[ "$BLOCK_EMAIL" != *"@"* || "$BLOCK_EMAIL" != *"."* ]]; then
        dialog --title $"Block/Unblock an email" \
               --msgbox $"Unrecognised email address" 6 40
        return
    fi
    if [[ $BLOCK == "y"* || $BLOCK == "Y"* ]]; then
        "${PROJECT_NAME}-ignore" -u "$SELECTED_USERNAME" -e "$BLOCK_EMAIL"
        dialog --title $"Block an email" \
               --msgbox "Email from $BLOCK_EMAIL to $SELECTED_USERNAME blocked" 6 75
    else
        "${PROJECT_NAME}-unignore" -u "$SELECTED_USERNAME" -e "$BLOCK_EMAIL"
        dialog --title $"Unblock an email" \
               --msgbox "Email from $BLOCK_EMAIL to $SELECTED_USERNAME unblocked" 6 75
    fi
}

function block_unblock_subject {
    select_user
    if [ ! "$SELECTED_USERNAME" ]; then
        return
    fi
    blockstr=$"Block/Unblock email going to"
    data=$(mktemp 2>/dev/null)
    dialog --backtitle $"Freedombone Control Panel" \
           --title "$blockstr $SELECTED_USERNAME" \
           --form "\\n" 8 70 3 \
           $"When email arrives with subject text:" 1 1 "" 1 40 24 28 \
           $"Block it:" 2 1 "yes" 2 40 4 4 \
           2> "$data"
    sel=$?
    case $sel in
        1) rm -f "$data"
           return;;
        255) rm -f "$data"
             return;;
    esac
    BLOCK_SUBJECT=$(sed -n 1p < "$data")
    BLOCK=$(sed -n 2p < "$data")
    rm -f "$data"
    if [ ${#BLOCK_SUBJECT} -lt 2 ]; then
        dialog --title $"Block/Unblock an email" \
               --msgbox $"No subject was given" 6 40
        return
    fi
    if [[ $BLOCK == "y"* || $BLOCK == "Y"* ]]; then
        "${PROJECT_NAME}-ignore" -u "$SELECTED_USERNAME" -t "$BLOCK_SUBJECT"
        dialog --title $"Block an email" \
               --msgbox "Email with subject $BLOCK_SUBJECT to $SELECTED_USERNAME blocked" 6 40
    else
        "${PROJECT_NAME}-unignore" -u "$SELECTED_USERNAME" -t "$BLOCK_SUBJECT"
        dialog --title $"Unblock an email" \
               --msgbox "Email with subject $BLOCK_SUBJECT to $SELECTED_USERNAME unblocked" 6 40
    fi
}

function create_keydrive_master {
    select_user
    if [ ! "$SELECTED_USERNAME" ]; then
        return
    fi
    dialog --title $"USB Master Keydrive" \
           --msgbox $"Plug in a LUKS encrypted USB drive" 6 40
    clear
    detect_usb_drive
    "${PROJECT_NAME}-keydrive" -u "$SELECTED_USERNAME" --master 'yes' -d "$USB_DRIVE"
    any_key
}

function create_keydrive_fragment {
    select_user
    if [ ! "$SELECTED_USERNAME" ]; then
        return
    fi
    dialog --title $"USB Fragment Keydrive" \
           --msgbox $"Plug in a LUKS encrypted USB drive" 6 40
    clear
    detect_usb_drive
    "${PROJECT_NAME}-keydrive" -u "$SELECTED_USERNAME" -d "$USB_DRIVE"
    any_key
}

function backup_data {
    dialog --title $"Backup data to USB" \
           --msgbox $"Plug in a LUKS encrypted USB drive" 6 40
    clear
    detect_usb_drive
    echo ''
    echo $"Detected USB drive $USB_DRIVE"
    echo ''
    echo $'Enter the passphrase for your LUKS encrypted backup drive:'
    "${PROJECT_NAME}-backup-local"
    any_key
}

function restore_data_from_storage {
    restore_type="$1"

    AllStr=$"all"
    ExitStr=$"Exit"
    RestoreStr=$"Restore apps"

    if [[ $restore_type != "local" ]]; then
        restore_command="${PROJECT_NAME}-restore-remote $remote_domain_name configuration;;"
    else
        remote_domain_name="$1"
        detect_usb_drive
        restore_command="${PROJECT_NAME}-restore-local $USB_DRIVE"
        RestoreStr=$"Restore apps from USB drive $USB_DRIVE"
    fi

    utils_installed=(configfiles
                     blocklist
                     mariadb
                     postgresql
                     letsencrypt
                     passwords
                     mutt
                     gpg
                     procmail
                     spamassassin
                     readme
                     ssh
                     userconfig
                     userlocal
                     userfin
                     certs
                     personal
                     email)

    detect_apps

    while true
    do

        app_list=()
        n=1
        applist="$n $AllStr off"
        n=$((n+1))
        app_list+=("$AllStr")

        util_index=0
        # shellcheck disable=SC2068
        for a in ${utils_installed[@]}
        do
            applist="$applist $n $a off"
            app_name=${utils_installed[util_index]}
            n=$((n+1))
            util_index=$((util_index+1))
            app_list+=("$app_name")
        done

        app_index=0
        # shellcheck disable=SC2068
        for a in ${APPS_INSTALLED_NAMES[@]}
        do
            applist="$applist $n $a off"
            n=$((n+1))
            app_name=${APPS_INSTALLED_NAMES[app_index]}
            app_index=$((app_index+1))
            app_list+=("$app_name")
        done
        applist="$applist $n $ExitStr on"
        n=$((n+1))
        app_list+=("$ExitStr")

        # shellcheck disable=SC2086
        choice=$(dialog --stdout --backtitle $"Freedombone" \
                        --title "$RestoreStr" \
                        --radiolist $'Choose:' \
                        30 50 20 $applist)

        # shellcheck disable=SC2181
        if [ $? -ne 0 ]; then
            break
        fi
        app_index=$((choice-1))
        app_name=${app_list[app_index]}

        # exit
        if [[ "$app_name" == "$ExitStr" ]]; then
            break
        fi

        clear

        # Restore all
        if [[ "$app_name" == "$AllStr" ]]; then
            $restore_command
            retcode="$?"
            if [[ "$retcode" != "0" ]]; then
                any_key
                if [[ "$1" == "local" ]]; then
                    dialog --title $"Restore all apps from USB" \
                           --msgbox $"Restore failed with code $retcode" 6 60
                else
                    dialog --title $"Restore all apps from $1" \
                           --msgbox $"Restore failed with code $retcode" 6 60
                fi
                break
            fi

            if [[ "$1" == "local" ]]; then
                dialog --title $"Restore all apps from USB" \
                       --msgbox $"Restore complete" 6 40
            else
                dialog --title $"Restore all apps from $1" \
                       --msgbox $"Restore complete" 6 40
            fi
            break
        fi

        # Restore an app
        $restore_command "${app_name}"
        retcode="$?"
        if [[ "$retcode" != "0" ]]; then
            any_key
            dialog --title $"Restore apps from USB" \
                   --msgbox $"Restore of ${app_name} failed with code $retcode" 6 60
            return
        fi

        # finished
        if [[ "$1" == "local" ]]; then
            dialog --title $"Restore apps from USB" \
                   --msgbox $"Restore complete" 6 40
        else
            dialog --title $"Restore apps from $1" \
                   --msgbox $"Restore complete" 6 40
        fi

    done
}

function restore_data {
    dialog --title $"Restore data from USB" \
           --msgbox $"Plug in your backup USB drive" 6 40
    clear
    echo ' '
    echo $'Enter the passphrase for your LUKS encrypted backup drive:'
    restore_data_from_storage local
}

function restore_data_remote {
    if [ ! $ADMIN_USER ]; then
        dialog --title $"Restore data from remote server" \
               --msgbox $"Unknown admin user" 6 40
        return
    fi
    data=$(mktemp 2>/dev/null)
    dialog --title $"Restore from remote server" \
           --backtitle $"Freedombone Control Panel" \
           --inputbox $"Enter the domain name of the server from which you wish to restore" 8 60 2>"$data"
    sel=$?
    case $sel in
        0)
            friend_server_domain_name=$(<"$data")

            if [ ${#friend_server_domain_name} -lt 2 ]; then
                rm -f "$data"
                return
            fi

            if [[ $friend_server_domain_name != *"."* ]]; then
                dialog --title $"Remote server domain name" \
                       --msgbox $"Invalid domain name" 6 40
                rm -f "$data"
                return
            fi

            restore_data_from_storage "$friend_server_domain_name"
            ;;
    esac
    rm -f "$data"
}

function logging_on_off {
    logging="no"
    dialog --title $"Logging" \
           --backtitle $"Freedombone Control Panel" \
           --defaultno \
           --yesno $"\\nDo you want to turn logging on?" 7 60
    sel=$?
    case $sel in
        0) logging="yes";;
        255) return;;
    esac

    clear
    echo ''
    echo $'This may take a few seconds. Please wait...'
    if [[ $logging == "no" ]]; then
        ${PROJECT_NAME}-logging off
    else
        ${PROJECT_NAME}-logging on
    fi
}

function restore_gpg_key {
    select_user
    if [ ! "$SELECTED_USERNAME" ]; then
        return
    fi
    restorestr=$"Restore GPG key for user"
    dialog --title "$restorestr $SELECTED_USERNAME" \
           --msgbox $"Plug in your USB keydrive" 6 40
    clear
    "${PROJECT_NAME}-recoverkey" -u "$SELECTED_USERNAME"
    any_key
}

function security_settings {
    "${PROJECT_NAME}-sec"
}

function format_drive {
    detect_usb_drive
    dialog --title $"Format USB drive $USB_DRIVE" \
           --backtitle $"Freedombone Control Panel" \
           --defaultno \
           --yesno $"\\nPlease confirm that you wish to format drive\\n\\n    ${USB_DRIVE}\\n\\nAll current data on the drive will be lost, and you will be prompted to give a password used to encrypt the drive.\\n\\nDANGER: If you screw up here and format the wrong drive it's your own fault!" 16 60
    sel=$?
    case $sel in
        1) return;;
        255) return;;
    esac

    clear
    echo ''
    echo $"Formatting drive $USB_DRIVE. ALL CONTENTS WILL BE LOST."
    echo ''
    "${PROJECT_NAME}-format" "$USB_DRIVE"
    any_key
}

function remove_backups {
    detect_usb_drive
    # shellcheck disable=SC2154
    dialog --title $"Remove backups from a USB drive $USB_DRIVE" \
           --backtitle $"Freedombone Control Panel" \
           --defaultno \
           --yesno $"\\nPlease confirm that you wish to remove backups from this drive\\n\\n    ${drive}\\n\\nYou will not be able to recover them afterwards." 12 60
    sel=$?
    case $sel in
        1) return;;
        255) return;;
    esac

    clear
    "${PROJECT_NAME}-backup-local" "$USB_DRIVE" remove
    any_key
}

function shut_down_system {
    dialog --title $"Power off the system" \
           --backtitle $"Freedombone Control Panel" \
           --defaultno \
           --yesno $"\\nPlease confirm that you wish to power off the system.\\n\\nWARNING: to power on again you will need to have physical access to the hardware." 10 60
    sel=$?
    case $sel in
        1) return;;
        255) return;;
    esac
    systemctl poweroff
}

function restart_system {
    dialog --title $"Restart the system" \
           --backtitle $"Freedombone Control Panel" \
           --defaultno \
           --yesno $"\\nPlease confirm that you wish to restart the system.\\n\\nWARNING: If you are using full disk encryption then you will need physical access to the hardware to type in the password" 10 60
    sel=$?
    case $sel in
        1) return;;
        255) return;;
    esac
    systemctl reboot -i
}

function change_system_name {
    data=$(mktemp 2>/dev/null)
    dialog --title $"Change the name of this system" \
           --backtitle $"Freedombone Control Panel" \
           --inputbox $'Enter a new name for this system on your local network\\n\\nIt will appear as newname.local' 10 60 2>"$data"
    sel=$?
    case $sel in
        0) NEW_SYSTEM_NAME=$(<"$data")
           if [ "$NEW_SYSTEM_NAME" ]; then
               if [ ${#NEW_SYSTEM_NAME} -gt 1 ]; then
                   sed -i "s|host-name=.*|host-name=$NEW_SYSTEM_NAME|g" /etc/avahi/avahi-daemon.conf
                   systemctl restart avahi-daemon
                   if grep -q "host-name=$NEW_SYSTEM_NAME" /etc/avahi/avahi-daemon.conf; then
                       dialog --title $"New local network name" \
                              --msgbox $"The name of this system on your local network was changed successfully" 6 70
                   fi
               fi
           fi
           ;;
    esac
    rm -f "$data"
}

function set_dynamic_IP {
    revert_to_dynamic=
    dialog --title $"Return to using a dynamic IP address" \
           --backtitle $"Freedombone Control Panel" \
           --yesno $"\\nDo you wish to go back to using a dynamic IP address?" 8 60
    sel=$?
    case $sel in
        0) revert_to_dynamic=1
           ;;
        1) return;;
    esac

    if [ $revert_to_dynamic ]; then
        wifi_original_network_settings
        clear
        echo ''
        echo $'Changing to a dynamic IP address.'
        echo ''
        echo $"System is rebooting. You may need to close this terminal and log in from a new one."
        systemctl reboot -i
    fi
}

function set_static_IP {
    IPv4_address=$(get_ipv4_address)
    IPv4_address_base=$(echo "$IPv4_address" | awk -F '.' '{print $1"."$2"."$3}')
    STATIC_IP="${IPv4_address_base}.60"
    STATIC_GATEWAY="${IPv4_address_base}.1"

    NEW_STATIC_IP=
    NEW_STATIC_GATEWAY=
    if [ -f /etc/network/interfaces.d/static ]; then
        STATIC_IP=$(grep "address " /etc/network/interfaces.d/static | head -n 1 | awk -F ' ' '{print $2}')
        STATIC_GATEWAY=$(grep "gateway " /etc/network/interfaces.d/static | head -n 1 | awk -F ' ' '{print $2}')
    fi

    # get the IP for the box
    data=$(mktemp 2>/dev/null)
    dialog --title $"Set a static local IP address" \
           --backtitle $"Freedombone Control Panel" \
           --inputbox $"In order to forward incoming internet traffic to this system most internet routers need to know a static local IP address to send the data to.\\n\\n
Enter a static local IP address for this system.\\n\\nIt will typically be ${IPv4_address_base}.x\\n\\nIf you leave this field blank then the system will revert to using a dynamic IP address." 18 60 "$STATIC_IP" 2>"$data"
    sel=$?
    case $sel in
        0) NEW_STATIC_IP=$(<"$data")
           if [[ "$NEW_STATIC_IP" != *"."* ]]; then
               set_dynamic_IP
               rm -f "$data"
               return
           fi
           ;;
        1) rm -f "$data"
           return;;
    esac
    rm -f "$data"

    # get the gateway
    data=$(mktemp 2>/dev/null)
    dialog --title $"Set the IP address of your internet router/modem" \
           --backtitle $"Freedombone Control Panel" \
           --inputbox $"Set the local IP address for your internet router or ADSL modem.\\n\\nIt will typically be ${IPv4_address_base}.1, ${IPv4_address_base}.254, or similar" 12 60 "$STATIC_GATEWAY" 2>"$data"
    sel=$?
    case $sel in
        0) NEW_STATIC_GATEWAY=$(<"$data")
           if [[ "$NEW_STATIC_GATEWAY" != *"."* ]]; then
               rm -f "$data"
               return
           fi
           ;;
        1) rm -f "$data"
           return;;
    esac

    if [[ "$NEW_STATIC_GATEWAY" == *"."* && "$NEW_STATIC_IP" == *"."* ]]; then
        ip_addresses_have_changed=1
        if [ -f /etc/network/interfaces.d/static ]; then
            ip_addresses_have_changed=
            if ! grep -q "address ${NEW_STATIC_IP}" /etc/network/interfaces.d/static; then
                ip_addresses_have_changed=1
            fi
            if ! grep -q "gateway ${NEW_STATIC_GATEWAY}" /etc/network/interfaces.d/static; then
                ip_addresses_have_changed=1
            fi
        fi
        if [ $ip_addresses_have_changed ]; then
            write_config_param "NETWORK_IS_STATIC" "1"
            write_config_param "LOCAL_NETWORK_STATIC_IP_ADDRESS" "$NEW_STATIC_IP"
            write_config_param "ROUTER_IP_ADDRESS" "$NEW_STATIC_GATEWAY"

            email_change_relay "$NEW_STATIC_IP"

            static_wifi_address=
            if [[ $(config_param_exists "WIFI_INTERFACE") == "1" ]]; then
                dialog --title $"Static local IP address" \
                       --backtitle $"Freedombone Control Panel" \
                       --yesno $"\\nSet a static address for the wifi adapter?\\n\\nIf you select 'no' then wired ethernet will be used." 10 60
                sel=$?
                case $sel in
                    0) static_wifi_address=1
                       write_config_param "NETWORK_IS_STATIC" "1"
                       ;;
                esac
            fi

            echo '# This file describes the network interfaces available on your system' > /etc/network/interfaces
            echo '# and how to activate them. For more information, see interfaces(5).' >> /etc/network/interfaces
            echo 'source /etc/network/interfaces.d/*' >> /etc/network/interfaces

            if [ ! $static_wifi_address ]; then
                # wired network
                remove_wifi_startup_script

                { echo 'auto eth0';
                  echo 'iface eth0 inet static';
                  echo "    address ${NEW_STATIC_IP}";
                  echo '    netmask 255.255.255.0';
                  echo "    gateway ${NEW_STATIC_GATEWAY}"; } >> /etc/network/interfaces.d/static
            else
                # wifi network
                wifi_settings
            fi

            clear
            echo ''
            echo $'Restarting the network daemon.'
            echo ''
            echo $'If you logged in using the previous IP address then you may need to close this terminal and log in again on the new one.'

            function_check pihole_change_ipv4
            pihole_change_ipv4 "${NEW_STATIC_IP}"

            dialog --title $"Static local IP address" \
                   --backtitle $"Freedombone Control Panel" \
                   --yesno $"\\nFor the change to take effect your system will now need to reboot. Do this now?" 8 60
            sel=$?
            case $sel in
                0) systemctl reboot -i;;
            esac
        fi
    fi
    rm -f "$data"
}

function wifi_settings {
    if [ -f /etc/hostapd/hostapd.conf ]; then
        return
    fi

    TEMP_WIFI_NETWORKS_FILE=~/.temp-${PROJECT_NAME}-wifi.cfg
    ${PROJECT_NAME}-wifi --networksinteractive $TEMP_WIFI_NETWORKS_FILE
    if [ -f $TEMP_WIFI_NETWORKS_FILE ]; then
        cp "$TEMP_WIFI_NETWORKS_FILE" "$WIFI_NETWORKS_FILE"
        rm $TEMP_WIFI_NETWORKS_FILE
        "${PROJECT_NAME}-wifi" --networks "$WIFI_NETWORKS_FILE"
        create_wifi_startup_script
        if [[ $(wifi_is_running) == "1" ]]; then
            dialog --title $"Wifi Settings" \
                   --msgbox $"Wifi settings were changed." 6 60
        else
            dialog --title $"Wifi Settings" \
                   --msgbox $"Wifi settings were changed. You will need to restart the system with ethernet cable removed for the changes to take effect." 7 60
        fi
    else
        remove_wifi_startup_script
    fi
}

function wifi_edit_networks {
    if [ -f /etc/hostapd/hostapd.conf ]; then
        return
    fi
    if [ ! -f "$WIFI_NETWORKS_FILE" ]; then
        { echo $'# Add wifi networks as follows:';
          echo '#';
          echo $'# MySSID';
          echo $'# wpa2-psk';
          echo $'# myWifiPassphrase';
          echo '#';
          echo $'# AnotherSSID';
          echo $'# none';
          echo '#'; } > "$WIFI_NETWORKS_FILE"
    fi
    editor "$WIFI_NETWORKS_FILE"
    "${PROJECT_NAME}-wifi" --networks "$WIFI_NETWORKS_FILE"
}

function hotspot_settings {
    data=$(mktemp 2>/dev/null)
    dialog --backtitle $"Freedombone Control Panel" \
           --title $"Hotspot Settings" \
           --form $"" 10 60 4 \
           $"Enabled (yes/no):" 1 1 "$WIFI_HOTSPOT" 1 24 5 5 \
           $"SSID:" 2 1 "$WIFI_SSID" 2 24 256 256 \
           $"Type (wpa2-psk/none):" 3 1 "$WIFI_TYPE" 3 24 10 10 \
           $"Passphrase:" 4 1 "$WIFI_PASSPHRASE" 4 24 256 256 \
           2> "$data"
    sel=$?
    case $sel in
        1) rm -f "$data"
           return;;
        255) rm -f "$data"
             return;;
    esac
    TEMP_WIFI_HOTSPOT=$(sed -n 1p < "$data")
    TEMP_WIFI_SSID=$(sed -n 2p < "$data")
    TEMP_WIFI_TYPE=$(sed -n 3p < "$data")
    TEMP_WIFI_PASSPHRASE=$(sed -n 4p < "$data")
    rm -f "$data"

    if [ ${#TEMP_WIFI_SSID} -lt 2 ]; then
        return
    fi
    if [ ${#TEMP_WIFI_TYPE} -lt 2 ]; then
        return
    fi

    WIFI_EXTRA=''
    if [[ $TEMP_WIFI_HOTSPOT == $'yes' || $TEMP_WIFI_HOTSPOT == $'y' || $TEMP_WIFI_HOTSPOT == $'on' ]]; then
        TEMP_WIFI_HOTSPOT='yes'
    else
        TEMP_WIFI_HOTSPOT='no'
        if [ -f "$WIFI_NETWORKS_FILE" ]; then
            WIFI_EXTRA="--networks $WIFI_NETWORKS_FILE"
        fi
    fi

    if [[ $TEMP_WIFI_TYPE != $'none' ]]; then
        if [ ! "$TEMP_WIFI_PASSPHRASE" ]; then
            dialog --title $"Wifi Settings" \
                   --msgbox $"No wifi hotspot passphrase was given" 6 40
            return
        fi
        if [ ${#TEMP_WIFI_PASSPHRASE} -lt 2 ]; then
            dialog --title $"Wifi Settings" \
                   --msgbox $"Wifi hotspot passphrase was too short" 6 40
            return
        fi

        WIFI_HOTSPOT=$TEMP_WIFI_HOTSPOT
        WIFI_SSID=$TEMP_WIFI_SSID
        WIFI_TYPE=$TEMP_WIFI_TYPE
        WIFI_PASSPHRASE=$TEMP_WIFI_PASSPHRASE

        if ! "${PROJECT_NAME}-wifi" -i "$WIFI_INTERFACE" -s "$WIFI_SSID" -t "$WIFI_TYPE" -p "$WIFI_PASSPHRASE" --hotspot "$WIFI_HOTSPOT" "$WIFI_EXTRA"; then
            echo $"Can't enable wifi hotspot"
            any_key
        fi
    else
        WIFI_HOTSPOT=$TEMP_WIFI_HOTSPOT
        WIFI_SSID=$TEMP_WIFI_SSID
        WIFI_TYPE=$TEMP_WIFI_TYPE
        WIFI_PASSPHRASE=$TEMP_WIFI_PASSPHRASE

        "${PROJECT_NAME}-wifi" -i "$WIFI_INTERFACE" -s "$WIFI_SSID" -t "$WIFI_TYPE" --hotspot "$WIFI_HOTSPOT" "$WIFI_EXTRA"
    fi

    # store any changes
    write_config_param "WIFI_HOTSPOT" "$WIFI_HOTSPOT"
    write_config_param "WIFI_SSID" "$WIFI_SSID"
    write_config_param "WIFI_TYPE" "$WIFI_TYPE"
    write_config_param "WIFI_PASSPHRASE" "$WIFI_PASSPHRASE"

    dialog --title $"Wifi Settings" \
           --msgbox $"Hotspot settings were changed" 6 40
}

function reinstall_mariadb {
    dialog --title $"Reinstall MariaDB" \
           --backtitle $"Freedombone Control Panel" \
           --defaultno \
           --yesno $"\\nThis should be a LAST RESORT, if the mysql daemon won't start. You will lose ALL databases and will then need to restore them from backup.\\n\\nAre you sure that you wish to continue?" 12 60
    sel=$?
    case $sel in
        1) return;;
        255) return;;
    esac

    clear
    database_reinstall

    dialog --title $"Reinstall MariaDB" \
           --msgbox $"MariaDB has been reinstalled" 6 40
}

function email_extra_domains {
    email_hostnames=$(grep "dc_other_hostnames" /etc/exim4/update-exim4.conf.conf | awk -F "'" '{print $2}')

    data=$(mktemp 2>/dev/null)
    dialog --title $"Email Domains" \
           --backtitle $"Freedombone Control Panel" \
           --inputbox $"Enter the list of email domains to use, separated by semicolons" 8 60 "$email_hostnames" 2>"$data"
    sel=$?
    case $sel in
        0)
            emailhostnames=$(<"$data")
            if [ ${#emailhostnames} -gt 2 ]; then
                if [[ "$email_hostnames" != "$emailhostnames" ]]; then
                    if [[ "$emailhostnames" == *"."* ]]; then
                        if [[ "$emailhostnames" != *" "* ]]; then
                            sed -i "s|dc_other_hostnames=.*|dc_other_hostnames='$emailhostnames'|g" /etc/exim4/update-exim4.conf.conf
                            update-exim4.conf
                            dpkg-reconfigure --frontend noninteractive exim4-config
                            systemctl restart saslauthd
                            dialog --title $"Email Domains" \
                                   --backtitle $"Freedombone Control Panel" \
                                   --msgbox $"Email domains were changed" 6 50
                        else
                            dialog --title $"Email Domains not set" \
                                   --backtitle $"Freedombone Control Panel" \
                                   --msgbox $"There should be no spaces in the list" 6 50
                        fi
                    fi
                fi
            fi
            ;;
    esac
    rm -f "$data"
}

function email_smtp_proxy {
    MUTTRC_FILE=/home/$ADMIN_USER/.muttrc
    if [ ! -f $MUTTRC_FILE ]; then
        return
    fi

    data=$(mktemp 2>/dev/null)
    dialog --backtitle $"Freedombone Control Panel" \
           --title $"SMTP Proxy for $ADMIN_USER" \
           --form $"You may need to proxy outgoing email via your ISP's mail server. If so enter the details below." 14 75 6 \
           $"Enable proxy:" 1 1 "$SMTP_PROXY_ENABLE" 1 24 5 5 \
           $"Protocol (smtp/smtps):" 2 1 "$SMTP_PROXY_PROTOCOL" 2 24 5 5 \
           $"ISP mail server:" 3 1 "$SMTP_PROXY_SERVER" 3 24 40 10000 \
           $"Port:" 4 1 "$SMTP_PROXY_PORT" 4 24 5 5 \
           $"Username:" 5 1 "$SMTP_PROXY_USERNAME" 5 24 40 10000 \
           $"Password:" 6 1 "$SMTP_PROXY_PASSWORD" 6 24 40 10000 \
           2> "$data"
    sel=$?
    case $sel in
        1) rm -f "$data"
           return;;
        255) rm -f "$data"
             return;;
    esac
    SMTP_PROXY_ENABLE=$(sed -n 1p < "$data")
    SMTP_PROXY_PROTOCOL=$(sed -n 2p < "$data")
    SMTP_PROXY_SERVER=$(sed -n 3p < "$data")
    SMTP_PROXY_PORT=$(sed -n 4p < "$data")
    SMTP_PROXY_USERNAME=$(sed -n 5p < "$data")
    SMTP_PROXY_PASSWORD=$(sed -n 6p < "$data")
    rm -f "$data"

    # change muttrc
    if [ "$SMTP_PROXY_ENABLE" != $'no' ]; then
        if ! grep -q "set smtp_url" "$MUTTRC_FILE"; then
            echo "set smtp_url=\"${SMTP_PROXY_PROTOCOL}://${SMTP_PROXY_USERNAME}:${SMTP_PROXY_PASSWORD}@${SMTP_PROXY_SERVER}:${SMTP_PROXY_PORT}/\"" >> "$MUTTRC_FILE"
        else
            sed -i "s|set smtp_url=.*|set smtp_url=\"${SMTP_PROXY_PROTOCOL}://${SMTP_PROXY_USERNAME}:${SMTP_PROXY_PASSWORD}@${SMTP_PROXY_SERVER}:${SMTP_PROXY_PORT}/\"|g" "$MUTTRC_FILE"
        fi
        sed -i 's|#set smtp_url|set smtp_url|g' "$MUTTRC_FILE"
    else
        if grep -q "set smtp_url" "$MUTTRC_FILE"; then
            sed -i 's|set smtp_url|#set smtp_url|g' "$MUTTRC_FILE"
        fi
    fi

    # save settings within the main configuration file
    write_config_param "SMTP_PROXY_ENABLE" "$SMTP_PROXY_ENABLE"
    write_config_param "SMTP_PROXY_PROTOCOL" "$SMTP_PROXY_PROTOCOL"
    write_config_param "SMTP_PROXY_SERVER" "$SMTP_PROXY_SERVER"
    write_config_param "SMTP_PROXY_PORT" "$SMTP_PROXY_PORT"
    write_config_param "SMTP_PROXY_USERNAME" "$SMTP_PROXY_USERNAME"
    write_config_param "SMTP_PROXY_PASSWORD" "$SMTP_PROXY_PASSWORD"
}

function menu_backup_restore {
    while true
    do
        W=(1 $"Backup data to USB drive"
           2 $"Restore GPG key from USB keydrive"
           3 $"Restore data from USB drive"
           4 $"Reinstall mariadb"
           5 $"Configure remote backups"
           6 $"Restore from remote backup"
           7 $"Backup GPG key to USB (master keydrive)"
           8 $"Backup GPG key to USB (fragment keydrive)"
           9 $"Format a USB drive (LUKS encrypted)"
           10 $"Remove backups from a USB drive")

        # shellcheck disable=SC2068
        selection=$(dialog --backtitle $"Freedombone Administrator Control Panel" --title $"Backup and Restore" --menu $"Choose an operation, or ESC for main menu:" 19 70 12 "${W[@]}" 3>&2 2>&1 1>&3)

        if [ ! "$selection" ]; then
           break
        fi

        case $selection in
            1) backup_data;;
            2) restore_gpg_key;;
            3) restore_data;;
            4) reinstall_mariadb;;
            5) configure_remote_backups;;
            6) restore_data_remote;;
            7) create_keydrive_master;;
            8) create_keydrive_fragment;;
            9) format_drive;;
            10) remove_backups;;
        esac
    done
}

function menu_email {
    while true
    do
        W=(1 $"Add a user to a mailing list"
           2 $"Remove a user from a mailing list"
           3 $"Add an email rule"
           4 $"Block/Unblock an email address"
           5 $"Block/Unblock email with subject text"
           6 $"Outgoing Email Proxy"
           7 $"Extra email domains")

        # shellcheck disable=SC2068
        selection=$(dialog --backtitle $"Freedombone Administrator Control Panel" --title $"Email Menu" --menu $"Choose an operation, or ESC for main menu:" 15 70 8 "${W[@]}" 3>&2 2>&1 1>&3)

        if [ ! "$selection" ]; then
           break
        fi

        case $selection in
            1) add_to_mailing_list;;
            2) remove_user_from_mailing_list;;
            3) email_rule;;
            4) block_unblock_email;;
            5) block_unblock_subject;;
            6) email_smtp_proxy;;
            7) email_extra_domains;;
        esac
    done
}

function domain_blocking_add {
    data=$(mktemp 2>/dev/null)
    dialog --title $"Block a domain or user" \
           --backtitle $"Freedombone Control Panel" \
           --inputbox $"Enter the domain name or GNU Social/postActiv/Pleroma nick@domain that you wish to block" 8 60 "" 2>"$data"
    sel=$?
    case $sel in
        0)
            blocked_domain=$(<"$data")
            if [ ${#blocked_domain} -gt 2 ]; then
                if [[ "${blocked_domain}" == *'.'* ]]; then
                    firewall_block_domain "$blocked_domain"
                    if [[ "${blocked_domain}" != *'@'* ]]; then
                        dialog --title $"Block a domain" \
                               --msgbox $"The domain $blocked_domain has been blocked" 6 40
                    else
                        dialog --title $"Block a GNU Social/postActiv/Pleroma nickname" \
                               --msgbox $"$blocked_domain has been blocked" 6 40
                    fi
                fi
            fi
            ;;
    esac
    rm -f "$data"
}

function ip_blocking_add {
    data=$(mktemp 2>/dev/null)
    dialog --title $"Block an IP address" \
           --backtitle $"Freedombone Control Panel" \
           --inputbox $"Enter the IP address that you wish to block" 8 60 "" 2>"$data"
    sel=$?
    case $sel in
        0)
            blocked_ip=$(<"$data")
            if [ ${#blocked_ip} -gt 2 ]; then
                if [[ "${blocked_ip}" == *'.'* ]]; then
                    firewall_block_ip "$blocked_ip"
                    if [[ "${blocked_ip}" != *'@'* ]]; then
                        dialog --title $"Block an IP address" \
                               --msgbox $"The IP address $blocked_ip has been blocked" 6 40
                    fi
                fi
            fi
            ;;
    esac
    rm -f "$data"
}

function domain_blocking_remove {
    data=$(mktemp 2>/dev/null)
    dialog --title $"Unblock a domain or user" \
           --backtitle $"Freedombone Control Panel" \
           --inputbox $"Enter the domain name or GNU Social/postActiv nick@domain that you wish to unblock" 8 60 "" 2>"$data"
    sel=$?
    case $sel in
        0)
            unblocked_domain=$(<"$data")
            if [ ${#unblocked_domain} -gt 2 ]; then
                if [[ "${unblocked_domain}" == *'.'* ]]; then
                    firewall_unblock_domain "$unblocked_domain"
                    if [[ "${unblocked_domain}" != *'@'* ]]; then
                        dialog --title $"Unblock a domain" \
                               --msgbox $"The domain $unblocked_domain has been unblocked" 6 40
                    else
                        dialog --title $"Unblock a GNU Social/postActiv nickname" \
                               --msgbox $"$unblocked_domain has been unblocked" 6 40
                    fi
                fi
            fi
            ;;
    esac
    rm -f "$data"
}

function ip_blocking_remove {
    data=$(mktemp 2>/dev/null)
    dialog --title $"Unblock an IP address" \
           --backtitle $"Freedombone Control Panel" \
           --inputbox $"Enter the IP address that you wish to unblock" 8 60 "" 2>"$data"
    sel=$?
    case $sel in
        0)
            unblocked_ip=$(<"$data")
            if [ ${#unblocked_ip} -gt 2 ]; then
                if [[ "${unblocked_ip}" == *'.'* ]]; then
                    firewall_unblock_ip "$unblocked_ip"
                    if [[ "${unblocked_ip}" != *'@'* ]]; then
                        dialog --title $"Unblock an IP address" \
                               --msgbox $"The IP address $unblocked_ip has been unblocked" 6 40
                    fi
                fi
            fi
            ;;
    esac
    rm -f "$data"
}

function domain_blocking_show {
    if [ -f "$FIREWALL_DOMAINS" ]; then
        clear
        echo ''
        echo $'The following domains or users have been blocked:'
        echo ''
        sort < "$FIREWALL_DOMAINS"
        any_key
    else
        dialog --title $"Show blocked domains or users" \
               --msgbox $"No domains or users are currently blocked" 6 40
    fi
}

function domain_blocking {
    while true
    do
        W=(1 $"Block a domain or user"
           2 $"Unblock a domain or user"
           3 $"Block an IP address"
           4 $"Unblock an IP address"
           5 $"Show blocked domains and users")

        # shellcheck disable=SC2068
        selection=$(dialog --backtitle $"Freedombone Administrator Control Panel" --title $"Domain or User Blocking" --menu $"Choose an operation, or ESC for main menu:" 13 70 6 "${W[@]}" 3>&2 2>&1 1>&3)

        if [ ! "$selection" ]; then
           break
        fi

        case $selection in
            1) domain_blocking_add;;
            2) domain_blocking_remove;;
            3) ip_blocking_add;;
            4) ip_blocking_remove;;
            5) domain_blocking_show;;
        esac
    done
}

function menu_users {
    while true
    do
        W=(1 $"Add a user"
           2 $"Delete a user"
           3 $"Change user password"
           4 $"Change user ssh public key"
           5 $"Reset password tries")

        # shellcheck disable=SC2068
        selection=$(dialog --backtitle $"Freedombone Administrator Control Panel" --title $"Manage Users" --menu $"Choose an operation, or ESC for main menu:" 13 70 6 "${W[@]}" 3>&2 2>&1 1>&3)

        if [ ! "$selection" ]; then
            break
        fi

        case $selection in
            1) add_user;;
            2) delete_user;;
            3) change_password;;
            4) change_ssh_public_key;;
            5) reset_password_tries;;
        esac
    done
}

function wifi_enable {
    disable_wifi='yes'
    dialog --title $"Enable Wifi" \
           --backtitle $"Freedombone Control Panel" \
           --defaultno \
           --yesno $"\\nDo you wish to enable wifi?" 10 50
    sel=$?
    case $sel in
        0) disable_wifi='no';;
        1) disable_wifi='yes';;
        255) return;;
    esac
    "${PROJECT_NAME}-wifi" --disable $disable_wifi
}

function performance_benchmarks {
    clear

    if [ ! -f /sbin/hdparm ]; then
        apt-get -yq install hdparm
    fi

    test_drive=/dev/sda1
    if ! ls $test_drive; then
        if ls /dev/mmcblk0p2; then
            test_drive=/dev/mmcblk0p2
        else
            return
        fi
    fi
    clear
    echo ''
    echo $"Testing read speed of drive $test_drive"
    hdparm -tT $test_drive
    any_key
}

function add_clacks {
    clacks=

    data=$(mktemp 2>/dev/null)
    dialog --title $"Add Clacks Overhead" \
           --backtitle $"Freedombone Control Panel" \
           --inputbox $"" 7 60 2>"$data"
    sel=$?
    case $sel in
        0)
            clacks=$(<"$data")
            if [ ${#clacks} -gt 1 ]; then

                WEB_FILES="/etc/nginx/sites-available/*"
                for f in $WEB_FILES
                do
                    if grep -q "X-Clacks-Overhead" "$f"; then
                        sed -i "s|X-Clacks-Overhead .*|X-Clacks-Overhead \"GNU $clacks\";|g" "$f"
                    else
                        sed -i "/X-Content-Type-Options/a add_header X-Clacks-Overhead \"GNU $clacks\";" "$f"
                    fi
                done

                systemctl restart nginx

                dialog --title $"Add Clacks Overhead" \
                       --msgbox $"\\nAdded for $clacks" 10 60
            fi
            ;;
    esac
    rm -f "$data"
}

function menu_wifi {
    if [[ "$(wifi_exists)" == "0" ]]; then
        dialog --title $"Wifi" \
               --msgbox $"No wifi adaptors were detected" 6 40
        return
    fi

    while true
    do
        status_str=$'Wifi OFF'
        if [ -f /etc/hostapd/hostapd.conf ]; then
            status_str=$'Hotspot ON'
        else
            if [ -f /etc/network/interfaces.d/wifi ]; then
                status_str=$'Wifi ON'
            fi
        fi

        W=(1 $"Enable or disable Wifi"
           2 $"Configure wifi networks"
           3 $"Manually edit wifi networks file"
           4 $"Hotspot settings")

        # shellcheck disable=SC2068
        selection=$(dialog --backtitle $"Freedombone Administrator Control Panel" --title $"Wifi Menu" --menu $"${status_str}\\n\\nChoose an operation, or ESC for main menu:" 14 70 6 "${W[@]}" 3>&2 2>&1 1>&3)

        if [ ! "$selection" ]; then
            break
        fi

        case $selection in
            1) wifi_enable;;
            2) wifi_settings;;
            3) wifi_edit_networks;;
            4) hotspot_settings;;
        esac
    done
}

function menu_app_settings {
    detect_installable_apps

    W=()
    appnames=()
    n=1
    app_index=0
    # shellcheck disable=SC2068
    for a in ${APPS_AVAILABLE[@]}
    do
        if [[ ${APPS_INSTALLED[$app_index]} != "0" ]]; then
            if [[ $(function_exists "configure_interactive_${a}") == "1" ]]; then
                W+=("$n" "$a")
                n=$((n+1))
                appnames+=("$a")
            fi
        fi
        app_index=$((app_index+1))
    done
    if [ $n -le 1 ]; then
        return
    fi

    # shellcheck disable=SC2086
    choice=$(dialog --backtitle $"Freedombone" \
                    --title $"Change settings for an App" \
                    --menu $'Choose:' \
                    26 40 30 "${W[@]}" 3>&2 2>&1 1>&3)

    # shellcheck disable=SC2181
    if [ "$choice" ]; then
        app_index=$((choice-1))
        chosen_app=${appnames[$app_index]}
        "configure_interactive_${chosen_app}"
    fi
}

function menu_top_level {
    while true
    do
        W=(1 $"About this system"
           2 $"Backup and Restore"
           3 $"App Settings"
           4 $"Add/Remove Apps"
           5 $"Logging on/off"
           6 $"Manage Users"
           7 $"Email Menu"
           8 $"Domain or User Blocking"
           9 $"Security Settings"
           10 $"Change the name of this system"
           11 $"Set a static local IP address"
           12 $"Wifi menu"
           13 $"Add Clacks"
           14 $"Check for updates"
           15 $"Performance Benchmarks"
           16 $"Change Dynamic DNS settings"
           17 $"Power off the system"
           18 $"Restart the system")

        # shellcheck disable=SC2068
        selection=$(dialog --backtitle $"Freedombone Administrator Control Panel" --title $"Administrator Control Panel" --menu $"Choose an operation, or ESC to exit:" 25 60 25 "${W[@]}" 3>&2 2>&1 1>&3)

        if [ ! "$selection" ]; then
            break
        fi

        please_wait

        case $selection in
            1) show_about;;
            2) menu_backup_restore;;
            3) menu_app_settings;;
            4) if ! /usr/local/bin/addremove; then
                   any_key
               fi
               ;;
            5) logging_on_off;;
            6) menu_users;;
            7) menu_email;;
            8) domain_blocking;;
            9) security_settings;;
            10) change_system_name;;
            11) set_static_IP;;
            12) menu_wifi;;
            13) add_clacks;;
            14) check_for_updates;;
            15) performance_benchmarks;;
            16) "${PROJECT_NAME}-ddns";;
            17) shut_down_system;;
            18) restart_system;;
        esac
    done
}

if [ ! -f "$COMPLETION_FILE" ]; then
    echo $'This command should only be run on an installed Freedombone system'
    exit 1
fi

ADMIN_USER=$(get_completion_param "Admin user")
menu_top_level
clear
cat /etc/motd
exit 0