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MASSFLASH.md

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Massflash

Overview

Leverages openwrt/scripts/massflash and kea to provide a way to flash openwrt APs with new images prior to the scale conference

Prereqs

Build the massflash livecd:

~$ nix build ".#nixosConfigurations.x86_64-linux.massflash.config.system.build.isoImage"

Connect the flashing interface to the bridge:

~$ sudo addtobr enp0s26u1u2

Setup wifi:

~$ sudo systemctl start wpa_supplicant

Add wireless config directly to /var/run/wpa_supplicant/wpa_supplicant.conf

network={
  ssid="<name>"
  psk="<password>"
}

Trigger a reloading of config:

~$ wpa_cli reconfigure

Create the dir layout expected for flashing:

~$ mkdir -p /persist/massflash

Under /persist/massflash:

flash_sha # commit hash used to build latest openwrt images
id_priv # private key used to log into the APs
wndr3700-v2/flash.bin # dir for this model of ap and its sysupgrade.bin
wndr3800/flash.bin
wndr3800ch/flash.bin

Known issues

  • DHCP client requests are duplicated on AP startup. Its not uncommon to see this in the logs but there is no issue with this happening. In the future it might be a good idea to investigate to see why the interfaces are yoyo'ing at boot and sending multiple requests.
  • massflash assumes its being called by kea script plugin. The following arg is passed to the massflash script and environment variables are assumed to be present:
arg: lease4_renew
env: QUERY4_TYPE, LEASE4_ADDRESS, LEASE4_HWADDR

Running oneoff

One off to run the massflash:

export QUERY4_TYPE=DHCPREQUEST
export LEASE4_ADDRESS=<IP>
massflash lease4_renew