#!/bin/sh

# The point of this script is to restore jail aliases
# if the lan0 interface flaps

if_lan="lan0"
ipv4_out="$(ifconfig lan0 | grep "inet " | grep -v "0xffffffff")"
ipv4_lan="$(echo "${ipv4_out}" | awk '{ print $2 }')"
ipv4_mask="$(echo "${ipv4_out}" | awk '{ print $4 }')"

if ! [ "$ipv4_mask" = "0xffff0000" ]; then
    >&2 echo "Unexpected netmask on lan0: ${ipv4_mask}"
    exit 1
fi

jls ip4.addr | while read ip; do
    case "$ip" in
        "192.168"*) ;;
        *) continue ;;
    esac
    if ifconfig "$if_lan" | grep -q "$ip"; then
        continue
    fi

    echo "Re-adding $ip to $if_lan"
    ifconfig "$if_lan" inet "$ip/32" alias
done