subprojects/ncsid/src/ncsid_udhcpc4.script

#!/bin/bash
source "$(dirname "${BASH_SOURCE[0]}")"/ncsid_lib.sh

function DetermineRouterMac() {
    # Attempt to find the neighbor once, in case our configuration is already
    # valid. Errors are silenced to make the logs more clear. The next call
    # will print any real errors.
    if DetermineNeighbor4 "$interface" "$router" 2>/dev/null; then
        return 0
    fi

    # arping might not have a valid source address, so we need to assign
    # the given address so arping has a source to write into the request
    # packet. We don't want a persistent configuration yet so we modify
    # the kernel directly.
    if ! ip -4 addr flush dev "$interface"; then
        echo "Failed to flush $interface" >&2
        return 1
    fi
    if ! ip addr add "$ip/$mask" dev "$interface"; then
        echo "Failed to assign $ip/$mask to $interface" >&2
        # Don't return, because we need to reset networkd
    fi

    local rc=0
    DetermineNeighbor4 "$interface" "$router" || rc=$?

    # We need to ensure that our old network configuration gets
    # restored, in case our early flushing breaks things.
    systemctl restart systemd-networkd || return $?
    return $rc
}

function HandleDHCP4() {
    local op="$1"

    if [ "$op" = "bound" ]; then
        echo "INTF: $interface" >&2
        echo "IP: $ip/$mask" >&2
        echo "GW: $router" >&2

        local router_mac
        if ! router_mac="$(DetermineRouterMac "$interface" "$router")"; then
            echo "Failed to acquire gateway mac for $router" >&2
            return 1
        fi
        echo "GW_MAC: $router_mac" >&2

        SuppressTerm
        local service='xyz.openbmc_project.Network'
        local rc=0
        SetStatic "$service" "$interface" && \
            UpdateIP "$service" "$interface" "$ip" "$mask" && \
            UpdateGateway "$service" "$interface" "$router" && \
            UpdateNeighbor "$service" "$interface" "$router" "$router_mac" || \
            rc=$?
        UnsuppressTerm
        touch /run/dhcp4.done
        return $rc
    fi
}

function Main() {
    set -o nounset
    set -o errexit
    set -o pipefail

    InitTerm
    HandleDHCP4 "$@"
}

return 0 2>/dev/null
Main "$@"