# ------------------------------------------------------------------------------
# Configure network
# This file is part of the init.sh project
# Copyright (c) 2019-2021 Geoffray Levasseur <fatalerrors@geoffray-levasseur.org>
# ------------------------------------------------------------------------------
# This file is distributed under 3-clause BSD license.
# The complete license agreement can be obtained at:
# https://opensource.org/licenses/BSD-3-Clause
# ------------------------------------------------------------------------------
# Variables:
#  * IPV4_IFACES: list of the interfaces with IPv4 configuration
#  * IPV6_IFACES: list of the interfaces with IPv6 configuration
#  * NET{4,6}_MODE_$iface: mode of configuration for $iface: static, manual or dhcp
#    - In static mode only:
#      * NET{4,6}_IP_$iface: IP address of the interface $iface
#      * NET{4,6}_GW_$iface: Gateway of the interface $iface
#      * NET{4,6}_NS_$iface: Name servers of the interface $iface
#      * NET{4,6}_NS_SEARCH_$iface: Domain name research the interface $iface
#    - In manual mode only
#      * NET{4,6}_MANUAL_FILE_$iface: filename for manual configuration of $iface
# ------------------------------------------------------------------------------

export VER_conf_syslog="0.0.6"

conf_network()
{
    local if_file="/etc/network/interfaces"
    backup_dist $if_file

    # The interfaces header contain loopback interface declaration
    install_file interfaces.head $if_file
    tag_file $if_file

    # First configure IPv4 ifaces
    local iface=
    for iface in $IPV4_IFACES; do
        echo -e "\n# --------------------------------\n"  >> $if_file

        if [[ $(eval echo \$NET4_MODE_$iface) == static ]]; then
            prnt I "Configuring IPv4 network interface $iface in static mode..."
            echo "auto $iface" >> $if_file
            echo "iface $iface inet static" >> $if_file
            echo -e "\taddress $(eval echo \$NET4_IP_$iface)" >> $if_file

            if [[ -n $(eval echo \$NET4_GW_$iface) ]]; then
                echo -e "\tgateway $(eval echo \$NET4_GW_$iface)" >> $if_file
            fi

            if [[ -n $(eval echo \$NET4_NS_$iface) ]]; then
                echo -e "\tdns_nameservers $(eval echo \$NET4_NS_$iface)" >> $if_file
            fi

            if [[ -n $(eval echo \$NET4_NS_SEARCH_$iface) ]]; then
                echo -e "\tdns_search $(eval echo \$NET4_NS_SEARCH_$iface)" >> $if_file
            fi

        elif [[ $(eval echo \$NET4_MODE_$iface) == dhcp ]]; then
            prnt I "Configuring IPv4 network interface $iface in DHCP mode..."
            echo "auto $iface" >> $if_file
            echo "iface $iface inet dhcp" >> $if_file

        elif [[ $(eval echo \$NET4_MODE_$iface) == manual ]]; then
            local fname=$(eval echo \$NET4_MANUAL_FILE_$iface)
            append_file $fname $if_file
            unset fname
        fi
    done

    for iface in $IPV6_IFACES; do
        echo -e "\n# --------------------------------\n"  >> $if_file

        if [[ $(eval echo \$NET6_MODE_$iface) == static ]]; then
            prnt I "Configuring IPv6 network interface $iface in static mode..."
            echo "auto $iface" >> $if_file
            echo "iface $iface inet6 static" >> $if_file
            echo -e "\taddress $(eval echo \$NET6_IP_$iface)" >> $if_file

            if [[ -n $(eval echo \$NET6_GW_$iface) ]]; then
                echo -e "\tgateway $(eval echo \$NET6_GW_$iface)" >> $if_file
            fi

            if [[ -n $(eval echo \$NET6_NS_$iface) ]]; then
                echo -e "\tdns_nameservers $(eval echo \$NET6_NS_$iface)" >> $if_file
            fi

            if [[ -n $(eval echo \$NET6_NS_SEARCH_$iface) ]]; then
                echo -e "\tdns_search $(eval echo \$NET6_NS_SEARCH_$iface)" >> $if_file
            fi

        elif [[ $(eval echo \$NET6_MODE_$iface) == dhcp ]]; then
            prnt I "Configuring IPv6 network interface $iface in DHCP mode..."
            echo "auto $iface" >> $if_file
            echo "iface $iface inet6 dhcp" >> $if_file

        elif [[ $(eval echo \$NET6_MODE_$iface) == manual ]]; then
            local fname=$(eval echo \$NET6_MANUAL_FILE_$iface)
            append_file $fname $if_file
            unset fname
        fi
    done

    unset iface if_file
    set_reboot_needed
}

precheck_conf_network()
{
    file_must_exists interfaces.head
    if [[ -z $IPV4_IFACES ]]; then
        prnt W "No IPv4 interfaces to configure."
    else
        for iface in $IPV4_IFACES; do
            if [[ -z $(eval echo \$NET4_MODE_$iface) ]]; then
                prnt E "Interfaces $iface have no mode set!"
            else
                case $(eval echo \$NET4_MODE_$iface) in
                    "static")
                        if [[ -z $(eval echo \$NET4_IP_$iface) ]]; then
                            prnt E "No IPv4 have been assigned to static interface $iface!"
                        fi
                        prnt I " * Interface $iface will have $(eval echo \$NET4_IP_$iface) static IPv4 address."
                    ;;
                    "dhcp")
                        prnt I " * Interface $iface will use DHCP."
                    ;;
                    "manual")
                        file_must_exists $(eval echo \$NET4_MANUAL_FILE_$iface)
                        prnt I " * Interface $iface will use manual IPv4 configuration in a file."
                    ;;
                    *)
                        prnt E "Interfaces mode \"$(eval echo \$NET4_MODE_$iface)\" unsuported!"
                        die 175
                    ;;
                esac
            fi
        done
    fi
    if [[ -z $IPV6_IFACES ]]; then
        prnt W "No IPv6 interfaces to configure."
    else
        for iface in $IPV6_IFACES; do
            if [[ -z $(eval echo \$NET6_MODE_$iface) ]]; then
                prnt E "Interfaces $iface have no mode set!"
            else
                case $(eval echo \$NET6_MODE_$iface) in
                    "static")
                        if [[ -z $(eval echo \$NET6_IP_$iface) ]]; then
                            prnt E "No IPv6 have been assigned to static interface $iface!"
                        fi
                        prnt I " * Interface $iface will have $(eval echo \$NET6_IP_$iface) static IPv6 address."
                    ;;
                    "dhcp")
                        prnt I " * Interface $iface will use DHCPv6."
                    ;;
                    "manual")
                        file_must_exists $(eval echo \$NET6_MANUAL_FILE_$iface)
                        prnt I " * Interface $iface will use manual IPv6 configuration in a file."
                    ;;
                    *)
                        prnt E "Interfaces mode \"$(eval echo \$NET6_MODE_$iface)\" unsuported!"
                        die 175
                    ;;
                esac
            fi
        done
    fi
}

export -f conf_network
export -f precheck_conf_network

# EOF