ifc=$1

# Run a DHCP server on the LAN on a fixed subnet for now.
# TODO(apenwarr): make this less hardcoded.
if [ -e /sys/class/net/wan0 ] && ! brctl show $ifc | grep -q wan0; then
  ip addr add 192.168.42.1/24 dev $ifc
  ip link set dev $ifc up
  killpid /var/run/dnsmasq.$ifc.pid
  babysit 60 startpid /var/run/dnsmasq.$ifc.pid \
      dnsmasq -k --log-facility=- \
          -i $ifc \
          --dhcp-range=$ifc,192.168.42.5,192.168.42.250 \
          --dhcp-leasefile=/config/dhcp.leases \
          -O option:dns-server,8.8.8.8 \
          2>&1 | logos dnsmasq-$ifc &
  exit 0
fi

if [ -z "$(ip -o -4 addr show $ifc)" ]; then
  run-dhclient $ifc
else
  # dhclient would do this if we had run it
  upload-logs-now
fi