#!/bin/bash
#  _____               _           _
# |   __|___ ___ ___ _| |___ _____| |_ ___ ___ ___
# |   __|  _| -_| -_| . | . |     | . | . |   | -_|
# |__|  |_| |___|___|___|___|_|_|_|___|___|_|_|___|
#
#                              Freedom in the Cloud
#
# IRC server application
#
# License
# =======
#
# Copyright (C) 2014-2018 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/>.

VARIANTS='full full-vim chat'

IN_DEFAULT_INSTALL=0
SHOW_ON_ABOUT=1

IRC_BOUNCER_PORT=6697
IRC_ONION_PORT=8098
IRC_PORT=6698

# An optional password to log into IRC. This applies to all users
IRC_PASSWORD=

# Number of entries for the bouncer to buffer
IRC_BUFFER_LENGTH=300

IRC_SHORT_DESCRIPTION=$'Classic chat system'
IRC_DESCRIPTION=$'Classic chat system'
IRC_MOBILE_APP_URL='https://f-droid.org/packages/org.yaaic'

irc_variables=(MY_USERNAME
               MY_NAME
               IRC_PORT
               IRC_BOUNCER_PORT
               IRC_ONION_HOSTNAME
               IRC_OPERATOR_PASSWORD
               DEFAULT_DOMAIN_NAME
               INSTALLED_WITHIN_DOCKER
               IRC_BUFFER_LENGTH
               ONION_ONLY)

function logging_on_irc {
    echo -n ''
}

function logging_off_irc {
    echo -n ''
}

function irc_get_global_password {
    grep "Password =" /etc/ngircd/ngircd.conf | head -n 1 | awk -F '=' '{print $2}'
}

function start_irc_bouncer {
    update_default_domain
    if [ ! -f /home/znc/.znc/znc.pem ]; then
        # no certificate exists
        su -c 'znc -p' - znc
    else
        # an existing certificate is being used
        su -c 'znc' - znc
    fi
}

function stop_irc_bouncer {
    pkill znc
}

function create_irssi_config {
    new_username="$1"

    read_config_param IRC_BOUNCER_PORT
    read_config_param IRC_ONION_PORT
    IRC_PASSWORD=$(irc_get_global_password)

    new_name="$2"
    if [ ${#new_name} -eq 0 ]; then
        new_name="$new_username"
    fi

    { echo 'servers = (';
      echo '  {';
      echo '    address = "chat.freenode.net";';
      echo '    chatnet = "Freenode";';
      echo '    port = "6667";';
      echo '    autoconnect = "no";';
      echo '  },';
      echo '  {';
      echo '    address = "irc.oftc.net";';
      echo '    chatnet = "OFTC";';
      echo '    port = "6667";';
      echo '    autoconnect = "no";';
      echo '  },';
      echo '  {';
      echo "    address = \"127.0.0.1\";";
      echo '    ssl_verify = "no";'; } > "/home/${new_username}/.irssi/config"
    if [[ ${ONION_ONLY} == 'no' ]]; then
        echo '    use_ssl = "yes";' >> "/home/${new_username}/.irssi/config"
        echo "    port = \"${IRC_BOUNCER_PORT}\";" >> "/home/${new_username}/.irssi/config"
    else
        echo '    use_ssl = "no";' >> "/home/${new_username}/.irssi/config"
        IRC_ONION_HOSTNAME=$(grep "irc onion domain" "${COMPLETION_FILE}" | head -n 1 | awk -F ':' '{print $2}')
        echo "    port = \"${IRC_ONION_PORT}\";" >> "/home/${new_username}/.irssi/config"
    fi
    echo '    chatnet = "Freedombone";' >> "/home/${new_username}/.irssi/config"
    echo '    autoconnect = "yes";' >> "/home/${new_username}/.irssi/config"
    if [ "${IRC_PASSWORD}" ]; then
        echo "    password = \"${IRC_PASSWORD}\";" >> "/home/${new_username}/.irssi/config"
    fi
    { echo '  }';
      echo ');';
      echo '';
      echo 'chatnets = {';
      echo '  Freedombone = {';
      echo '    type = "IRC";';
      echo '    max_kicks = "1";';
      echo '    max_msgs = "4";';
      echo '    max_whois = "1";';
      echo '  };';
      echo '  Freenode = {';
      echo '    type = "IRC";';
      echo '    max_kicks = "1";';
      echo '    max_msgs = "4";';
      echo '    max_whois = "1";';
      echo '  };';
      echo '  OFTC = {';
      echo '    type = "IRC";';
      echo '    max_kicks = "1";';
      echo '    max_msgs = "1";';
      echo '    max_whois = "1";';
      echo '  };';
      echo '};';
      echo '';
      echo 'channels = (';
      echo '  { name = "#freedombone"; chatnet = "Freedombone"; autojoin = "Yes"; },';
      echo ');';
      echo '';
      echo 'settings = {';
      echo "  core = { real_name = \"$new_name\"; user_name = \"$new_username\"; nick = \"$new_username\"; };";
      echo '  "fe-text" = { actlist_sort = "refnum"; };';
      echo '};';
      echo 'ignores = ( { level = "CTCPS"; } );'; } >> "/home/${new_username}/.irssi/config"

    chown -R "${new_username}":"${new_username}" "/home/${new_username}/.irssi"
}

function remove_user_irc_bouncer {
    remove_username="$1"

    if [ -f /home/znc/.znc/configs/znc.conf ]; then
        stop_irc_bouncer
        sed -i "/<User ${remove_username}>/,/</User>/d" /home/znc/.znc/configs/znc.conf
        start_irc_bouncer
    fi
}

function remove_user_irc {
    remove_username="$1"

    "${PROJECT_NAME}-pass" -u "$remove_username" --rmapp irc

    remove_user_irc_bouncer "${remove_username}"
    if [ -d "/home/${remove_username}/.irssi" ]; then
        rm -rf "/home/${remove_username}/.irssi"
    fi
    if [ -d "/home/${remove_username}/irclogs" ]; then
        rm -rf "/home/${remove_username}/irclogs"
    fi
}

function irc_set_global_password_base {
    NEW_IRC_PASSWORD="$1"
    EXISTING_IRC_PASSWORD=$(irc_get_global_password)
    sed -i "0,/RE/s/Password =.*/Password =$NEW_IRC_PASSWORD/" /etc/ngircd/ngircd.conf

    # replace the password for all users
    for d in /home/*/ ; do
        IRC_USERNAME=$(echo "$d" | awk -F '/' '{print $3}')
        if [[ $(is_valid_user "$IRC_USERNAME") == "1" ]]; then
            if [ -f "/home/${IRC_USERNAME}/.irssi/config" ]; then
                sed -i "s|$EXISTING_IRC_PASSWORD|$NEW_IRC_PASSWORD|g" "/home/${IRC_USERNAME}/.irssi/config"
                chown -R "${IRC_USERNAME}":"${IRC_USERNAME}" "/home/${IRC_USERNAME}/.irssi"
            fi
        fi
    done

    read_config_param DEFAULT_DOMAIN_NAME
    read_config_param IRC_PORT
    read_config_param MY_USERNAME

    stop_irc_bouncer
    sleep 2

    # change the hashes. There are multiple users, but since we're using a global
    # password this doesn't matter
    ZNC_SALT="$(dd if=/dev/urandom bs=16c count=1 | md5sum | awk -F ' ' '{print $1}' | cut -c1-20)"
    new_user_hash=$(echo -n "${NEW_IRC_PASSWORD}${ZNC_SALT}" | sha256sum | awk -F ' ' '{print $1}')
    sed -i "s|Hash = .*|Hash = ${new_user_hash}|g" /home/znc/.znc/configs/znc.conf
    sed -i "s|Salt = .*|Salt = ${ZNC_SALT}|g" /home/znc/.znc/configs/znc.conf

    # change the server password
    sed -i "s|Server     = 127.0.0.1.*|Server     = 127.0.0.1 ${IRC_PORT} ${NEW_IRC_PASSWORD}|g" /home/znc/.znc/configs/znc.conf

    # Update the password
    "${PROJECT_NAME}-pass" -u "$MY_USERNAME" -a irc -p "$NEW_IRC_PASSWORD"

    # matrix bridge to irc
    if [ -f "$INSTALL_DIR/matrix_irc_bridge/config.yaml" ]; then
        sed -i "s|password: .*|password: \"$NEW_IRC_PASSWORD\"|g" "$INSTALL_DIR/matrix_irc_bridge/config.yaml"
        systemctl restart matrix_irc_bridge
    fi

    write_config_param "IRC_PASSWORD" "$NEW_IRC_PASSWORD"

    # restart the daemon for the new password to take effect
    systemctl restart ngircd
    start_irc_bouncer
}

function change_password_irc {
    new_global_password="$2"

    set_password_for_all_users irc "$new_global_password"
    irc_set_global_password_base "$new_global_password"
}

function add_user_irc_bouncer {
    new_username="$1"
    new_user_password=$(irc_get_global_password)
    IRC_PASSWORD="$new_user_password"
    is_admin='true'
    if [ ! "$3" ]; then
        is_admin='false'
    fi

    if [[ $(is_valid_user "$new_username") == "0" ]]; then
        return
    fi

    read_config_param IRC_PORT
    read_config_param DEFAULT_DOMAIN_NAME

    "${PROJECT_NAME}-pass" -u "$new_username" -a irc -p "$new_user_password"

    stop_irc_bouncer

    ZNC_SALT="$(dd if=/dev/urandom bs=16c count=1 | md5sum | awk -F ' ' '{print $1}' | cut -c1-20)"
    new_user_hash=$(echo -n "${new_user_password}${ZNC_SALT}" | sha256sum | awk -F ' ' '{print $1}')

    if grep -q "<User ${new_username}>" /home/znc/.znc/configs/znc.conf; then
        # user already exists
        sed -i "s|Hash = .*|Hash = ${new_user_hash}|g" /home/znc/.znc/configs/znc.conf
        sed -i "s|Salt = .*|Salt = ${ZNC_SALT}|g" /home/znc/.znc/configs/znc.conf
        return
    fi

    { echo "<User ${new_username}>";
      echo "    Admin      = ${is_admin}";
      echo "    AltNick = ${new_username}_";
      echo '    AppendTimestamp = false';
      echo '    AutoClearChanBuffer = true';
      echo '    AutoClearQueryBuffer = true';
      echo "    Buffer = ${IRC_BUFFER_LENGTH}";
      echo '    DenyLoadMod = false';
      echo '    DenySetBindHost = false';
      echo "    Ident = ${new_username}";
      echo '    JoinTries = 10';
      echo '    LoadModule = chansaver';
      echo '    LoadModule = controlpanel';
      echo '    MaxJoins = 10';
      echo '    MaxNetworks = 10';
      echo '    MaxQueryBuffers = 50';
      echo '    MultiClients = true';
      echo "    Nick = ${new_username}";
      echo '    PrependTimestamp = true';
      echo '    QuitMsg = Bye';
      echo "    RealName = ${new_username}";
      echo '    StatusPrefix = *';
      echo '    TimestampFormat = [%H:%M:%S]';
      echo '';
      echo "    <Network ${PROJECT_NAME}>";
      echo '        LoadModule = chansaver';
      echo '        LoadModule = simple_away';
      echo '';
      echo "        Server     = 127.0.0.1 ${IRC_PORT} ${IRC_PASSWORD}";
      echo '';
      echo "        <Chan #${PROJECT_NAME}>";
      echo '        </Chan>';
      echo '    </Network>';
      echo '';
      echo '    <Network oftc>';
      echo '        LoadModule = chansaver';
      echo '        LoadModule = simple_away';
      echo '        FloodBurst = 4';
      echo '        FloodRate = 1.00';
      echo '        IRCConnectEnabled = true';
      echo '        Server = irc.oftc.net 6697';
      echo '    </Network>';
      echo '';
      echo '    <Network freenode>';
      echo '        LoadModule = chansaver';
      echo '        LoadModule = simple_away';
      echo '        FloodBurst = 4';
      echo '        FloodRate = 1.00';
      echo '        IRCConnectEnabled = true';
      echo '        Server = irc.freenode.net 6697';
      echo '    </Network>';
      echo '';
      echo '    <Pass password>';
      echo "        Hash = ${new_user_hash}";
      echo '        Method = sha256';
      echo "        Salt = ${ZNC_SALT}";
      echo '    </Pass>';
      echo '</User>'; } >> /home/znc/.znc/configs/znc.conf

    mkdir -p "/home/znc/.znc/users/${new_username}/moddata"
    mkdir -p "/home/znc/.znc/users/${new_username}/networks"
    mkdir "/home/znc/.znc/users/${new_username}/moddata/chanserver"
    mkdir "/home/znc/.znc/users/${new_username}/moddata/controlpanel"
    mkdir "/home/znc/.znc/users/${new_username}/moddata/perform"
    mkdir "/home/znc/.znc/users/${new_username}/moddata/webadmin"
    mkdir -p "/home/znc/.znc/users/${new_username}/networks/${PROJECT_NAME}/moddata/chansaver"
    mkdir -p "/home/znc/.znc/users/${new_username}/networks/${PROJECT_NAME}/moddata/simple_away"

    mkdir -p /home/znc/.znc/moddata/webadmin

    chown -R znc:znc /home/znc/.znc

    start_irc_bouncer
}

function add_user_irc {
    new_username="$1"
    new_user_password="$2"

    IRC_PASSWORD=$(irc_get_global_password)
    if [ ${#IRC_PASSWORD} -lt 2 ]; then
        IRC_PASSWORD=
    fi

    if [ ! -d "/home/${new_username}/.irssi" ]; then
        mkdir "/home/${new_username}/.irssi"
    fi

    create_irssi_config "${new_username}"
    add_user_irc_bouncer "${new_username}" "${IRC_PASSWORD}"
    echo '0'
}

function run_client_irc {
    irssi
}

function irc_show_password {
    IRC_PASSWORD=$(irc_get_global_password)
    dialog --title $"IRC Password" \
           --msgbox "$IRC_PASSWORD" 6 40
}

function irc_set_global_password {
    EXISTING_IRC_PASSWORD=$(irc_get_global_password)
    data=$(mktemp 2>/dev/null)
    dialog --title $"IRC Password" \
           --clear \
           --backtitle $"Freedombone Control Panel" \
           --passwordbox $"Password for all IRC users, or press Enter for no password" 10 60 "$EXISTING_IRC_PASSWORD" 2> "$data"
    sel=$?
    case $sel in
        0)
            NEW_IRC_PASSWORD=$(<"$data")
            irc_set_global_password_base "$NEW_IRC_PASSWORD"
            dialog --title $"IRC Password" \
                   --msgbox $"The IRC password was changed" 6 40
            ;;
    esac
    rm -f "$data"
}

function configure_interactive_irc {
    if [ ! -d /etc/ngircd ]; then
        dialog --title $"IRC Menu" \
               --msgbox $"No IRC server is installed" 6 70
        return
    fi

    W=(1 $"Set a password for all IRC users"
       2 $"Show current IRC login password")

    while true
    do
        # shellcheck disable=SC2068
        selection=$(dialog --backtitle $"Freedombone Administrator Control Panel" --title $"IRC" --menu $"Choose an operation, or ESC to exit:" 10 60 2 "${W[@]}" 3>&2 2>&1 1>&3)

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

        case $selection in
            1) irc_set_global_password;;
            2) irc_show_password;;
        esac
    done
}

function install_interactive_irc {
    echo -n ''
    APP_INSTALLED=1
}

function reconfigure_irc {
    echo -n ''
}

function upgrade_irc {
    echo -n ''
}

function backup_local_irc {
    echo -n ''
}

function restore_local_irc {
    echo -n ''
}

function backup_remote_irc {
    echo -n ''
}

function restore_remote_irc {
    echo -n ''
}

function remove_irc {
    remove_watchdog_daemon ngircd
    systemctl stop ngircd
    apt-get -yq remove --purge ngircd
    apt-get -yq remove --purge irssi
    if [ -d /etc/ngircd ]; then
        rm -rf /etc/ngircd
    fi

    iptables -D INPUT -p tcp --dport 1024:65535 --sport ${IRC_BOUNCER_PORT} -j ACCEPT
    function_check save_firewall_settings
    save_firewall_settings
    firewall_remove ${IRC_BOUNCER_PORT} tcp

    function_check remove_onion_service
    remove_onion_service irc ${IRC_ONION_PORT}
    remove_completion_param install_irc
    remove_completion_param configure_firewall_for_irc
    sed -i '/IRC /d' "${COMPLETION_FILE}"
    sed -i '/znc 2> /d' /etc/crontab
    stop_irc_bouncer
    if [ -d /home/znc ]; then
        userdel -r znc
    fi
    if [ -d /var/run/ircd ]; then
        rm -rf /var/run/ircd
    fi
}

function configure_firewall_for_irc {
    if [ ! -d /etc/ngircd ]; then
        return
    fi
    if [[ $(is_completed "${FUNCNAME[0]}") == "1" ]]; then
        return
    fi
    if [[ ${INSTALLED_WITHIN_DOCKER} == "yes" ]]; then
        # docker does its own firewalling
        return
    fi
    if [[ ${ONION_ONLY} != "no" ]]; then
        return
    fi
    iptables -I INPUT -p tcp --dport 1024:65535 --sport ${IRC_BOUNCER_PORT} -j ACCEPT
    function_check save_firewall_settings
    save_firewall_settings

    firewall_add IRC ${IRC_BOUNCER_PORT} tcp
    echo 'configure_firewall_for_irc' >> "${COMPLETION_FILE}"
}

function install_irc_server {
    if [[ $(app_is_installed irc_server) == "1" ]]; then
        return
    fi
    apt-get -yq install ngircd

    if [ ! -d /etc/ngircd ]; then
        echo $"ERROR: ngircd does not appear to have installed. $CHECK_MESSAGE"
        exit 53
    fi

    # obtain a cert for the default domain
    if [[ "$(cert_exists "${DEFAULT_DOMAIN_NAME}" pem)" == "0" ]]; then
        echo $'Obtaining certificate for the main domain'
        create_site_certificate "${DEFAULT_DOMAIN_NAME}" 'yes'
    fi

    if [[ "$(cert_exists "${DEFAULT_DOMAIN_NAME}")" == "0" ]]; then
        "${PROJECT_NAME}-addcert" -h ngircd --dhkey "${DH_KEYLENGTH}"
        function_check check_certificates
        CHECK_HOSTNAME=ngircd
        check_certificates ngircd
    fi

    DEFAULTDOMAIN=${DEFAULT_DOMAIN_NAME}

    IRC_PASSWORD="$(create_password "${MINIMUM_PASSWORD_LENGTH}")"

    set_password_for_all_users irc "$IRC_PASSWORD"


    { echo '**************************************************';
      echo $'*           F R E E D O M B O N E   I R C        *';
      echo '*                                                *';
      echo $'*               Freedom in the Cloud             *';
      echo '**************************************************'; } > /etc/ngircd/motd
    sed -i 's|MotdFile = /etc/ngircd/ngircd.motd|MotdFile = /etc/ngircd/motd|g' /etc/ngircd/ngircd.conf
    sed -i "s/irc@irc.example.com/$MY_EMAIL_ADDRESS/g" /etc/ngircd/ngircd.conf
    sed -i "s/irc.example.net/$DEFAULTDOMAIN/g" /etc/ngircd/ngircd.conf
    sed -i "s|Yet another IRC Server running on Debian GNU/Linux|IRC Server of $DEFAULTDOMAIN|g" /etc/ngircd/ngircd.conf
    sed -i 's/;Password = wealllikedebian/Password =/g' /etc/ngircd/ngircd.conf
    sed -i "s/;Ports =.*/Ports = ${IRC_PORT}/g" /etc/ngircd/ngircd.conf
    if [[ $ONION_ONLY == 'no' ]]; then
        if [ -f "/etc/ssl/certs/${DEFAULT_DOMAIN_NAME}.pem" ]; then
            sed -i "s|;CertFile = /etc/ssl/certs/server.crt|CertFile = /etc/ssl/certs/${DEFAULT_DOMAIN_NAME}.pem|g" /etc/ngircd/ngircd.conf
        else
            sed -i "s|;CertFile = /etc/ssl/certs/server.crt|CertFile = /etc/ssl/certs/${DEFAULT_DOMAIN_NAME}.crt|g" /etc/ngircd/ngircd.conf
        fi
        sed -i "s|;DHFile = /etc/ngircd/dhparams.pem|DHFile = /etc/ssl/certs/${DEFAULT_DOMAIN_NAME}.dhparam|g" /etc/ngircd/ngircd.conf
        sed -i "s|;KeyFile = /etc/ssl/private/server.key|KeyFile = /etc/ssl/private/${DEFAULT_DOMAIN_NAME}.key|g" /etc/ngircd/ngircd.conf
        sed -i "s/;Ports =.*/Ports = ${IRC_PORT}/2" /etc/ngircd/ngircd.conf
    else
        sed -i 's|;SSLConnect.*|SSLConnect = no|g'
        # comment out the second Ports entry
        if ! grep -q ";Ports =" /etc/ngircd/ngircd.conf; then
            sed -i '0,/Ports =/! s/Ports =/;Ports =/' /etc/ngircd/ngircd.conf
        fi
    fi
    sed -i "s/;Name = #ngircd/Name = #${PROJECT_NAME}/g" /etc/ngircd/ngircd.conf
    sed -i "s/;Topic = Our ngircd testing channel/Topic = ${PROJECT_NAME} chat channel/g" /etc/ngircd/ngircd.conf
    sed -i 's/;MaxUsers = 23/MaxUsers = 23/g' /etc/ngircd/ngircd.conf
    sed -i "s|;KeyFile = /etc/ngircd/#chan.key|KeyFile = /etc/ngircd/${PROJECT_NAME}.key|g" /etc/ngircd/ngircd.conf
    sed -i "s/;CloakHost = cloaked.host/CloakHost = ${PROJECT_NAME}/g" /etc/ngircd/ngircd.conf
    IRC_SALT="$(create_password 30)"
    if [ -f "${IMAGE_PASSWORD_FILE}" ]; then
        IRC_OPERATOR_PASSWORD="$(printf "%s" "$(cat "$IMAGE_PASSWORD_FILE")")"
    else
        IRC_OPERATOR_PASSWORD="$(create_password "${MINIMUM_PASSWORD_LENGTH}")"
    fi
    sed -i "s|;CloakHostSalt = abcdefghijklmnopqrstuvwxyz|CloakHostSalt = $IRC_SALT|g" /etc/ngircd/ngircd.conf
    sed -i 's/;ConnectIPv4 = yes/ConnectIPv4 = yes/g' /etc/ngircd/ngircd.conf
    sed -i 's/;MorePrivacy = no/MorePrivacy = yes/g' /etc/ngircd/ngircd.conf
    sed -i 's/;RequireAuthPing = no/RequireAuthPing = no/g' /etc/ngircd/ngircd.conf
    sed -i "s/;Name = TheOper/Name = $MY_USERNAME/g" /etc/ngircd/ngircd.conf
    sed -i "s/;Password = ThePwd/Password = $IRC_OPERATOR_PASSWORD/g" /etc/ngircd/ngircd.conf
    sed -i 's|;Listen =.*|Listen = 0.0.0.0,0.0.0.0:9050,127.0.0.1,127.0.0.1:9050|g' /etc/ngircd/ngircd.conf
    if [ "${IRC_PASSWORD}" ]; then
        sed -i "0,/RE/s/Password =.*/Password =$IRC_PASSWORD/" /etc/ngircd/ngircd.conf
    fi
    # upgrade a cypher
    sed -i 's|SECURE128|SECURE256|g' /etc/ngircd/ngircd.conf
    mkdir /var/run/ircd
    chown -R irc:irc /var/run/ircd
    mkdir /var/run/ngircd
    touch /var/run/ngircd/ngircd.pid
    chown -R irc:irc /var/run/ngircd

    # shellcheck disable=SC2034
    IRC_ONION_HOSTNAME=$(add_onion_service irc "${IRC_BOUNCER_PORT}" "${IRC_ONION_PORT}")

    if [ ! -d /var/run/ircd ]; then
        mkdir /var/run/ircd
        chown -R irc:irc /var/run/ircd
    fi

    chmod 600 /etc/ngircd/ngircd.conf
    systemctl restart ngircd

    add_watchdog_daemon ngircd

    function_check configure_firewall_for_irc
    configure_firewall_for_irc
    install_completed irc_server
}

function install_irc_client {
    if [[ $(app_is_installed irc_client) == "1" ]]; then
        return
    fi
    apt-get -yq install irssi

    if [ ! -d "/home/${MY_USERNAME}/.irssi" ]; then
        mkdir "/home/${MY_USERNAME}/.irssi"
    fi

    create_irssi_config "${MY_USERNAME}" "$MY_NAME"
    install_completed irc_client
}

function install_irc_bouncer {
    if [[ $(app_is_installed irc_bouncer) == "1" ]]; then
        return
    fi

    apt-get -yq install znc

    adduser --disabled-login --gecos 'znc' znc
    if [ ! -d /home/znc ]; then
        echo $"/home/znc directory not created"
        exit 7354262
    fi

    mkdir -p /home/znc/.znc/configs
    mkdir -p /home/znc/.znc/users

    { echo 'AnonIPLimit = 10';
      echo 'ConnectDelay = 5';
      echo 'HideVersion = false';
      echo 'MaxBufferSize = 500';
      echo 'ProtectWebSessions = true';
      echo 'SSLCertFile = /home/znc/.znc/znc.pem';
      echo 'ServerThrottle = 30';
      echo 'Version = 1.6.2';
      echo '';
      echo '<Listener listener0>';
      echo '  AllowIRC = true';
      echo '  AllowWeb = false';
      echo '  IPv4 = true';
      echo '  IPv6 = true';
      echo '  Port = 6697'; } > /home/znc/.znc/configs/znc.conf
    if [[ "${ONION_ONLY}" == 'no' ]]; then
        echo '  SSL = true' >> /home/znc/.znc/configs/znc.conf
    else
        echo '  SSL = false' >> /home/znc/.znc/configs/znc.conf
    fi
    { echo '  URIPrefix = /';
      echo '</Listener>';
      echo ''; } >> /home/znc/.znc/configs/znc.conf

    if [ $IRC_PORT -ne $IRC_ONION_PORT ]; then
        { echo '<Listener listener1>';
          echo '  AllowIRC = true';
          echo '  AllowWeb = false';
          echo '  IPv4 = true';
          echo '  IPv6 = true';
          echo "  Port = ${IRC_ONION_PORT}";
          echo '  SSL = false';
          echo '  URIPrefix = /';
          echo '</Listener>';
          echo ''; } >> /home/znc/.znc/configs/znc.conf
    fi

    chown -R znc:znc /home/znc/.znc

    add_user_irc_bouncer "${MY_USERNAME}" "${IRC_PASSWORD}" true

    # certificate for use with SSL
    start_irc_bouncer

    function_check cron_add_mins
    cron_add_mins 10 "/usr/bin/znc 2> /dev/null" znc

    install_completed irc_bouncer
}

function install_irc {
    install_irc_server
    install_irc_client
    install_irc_bouncer
    APP_INSTALLED=1
}

# NOTE: deliberately no exit 0