Fast update scripts for LEDE/OpenWRT

recv_fw.sh

#!/bin/sh

# run this script on ROUTER

ipaddr=$1

# recv checksum
check=$(nc $ipaddr 1235)
echo "Received checksum: $check"

# recv firmware
nc $ipaddr 1234 > /tmp/fw.bin
mycheck=$(md5sum /tmp/fw.bin | cut -d ' ' -f 1)
echo "Computed checksum: $mycheck"

if [ "$check" == "$mycheck" ]
then
	echo "OKAY, I can upgrade"
	sysupgrade /tmp/fw.bin
else
	echo "ERROR, I cannot upgrade"
fi

send_fw.sh

#!/bin/sh

# run this script on PC

firmware=$1

check=$(md5sum "$firmware" 2>/dev/null)
if [ $? != 0 ]
then
	echo "Please pass a valid file"
	exit
fi
check=$(echo "$check" | cut -d ' ' -f 1)

echo "Sending $firmware"
echo "Checksum: $check"

# send checksum
echo "$check" | nc -l -p 1235 -q 0

# send firmware
nc -l -p 1234 -q 0 < "$firmware"

Usage

On PC

$ ./send_fw.sh bin/targets/generic/lede-squashfs-sysupgrade.bin 

Sending lede-squashfs-sysupgrade.bin
Checksum: 2bb877c0516144fde2e3966e7980ec9f

On Router

$ ./recv_fw.sh 192.168.0.2

Received checksum: 2bb877c0516144fde2e3966e7980ec9f
Computed checksum: 2bb877c0516144fde2e3966e7980ec9f
OKAY, I can upgrade
Image metadata not found
Saving config files...
killall: watchdog: no process killed
Commencing upgrade. All shell sessions will be closed now.