Bash script to reboot a Cisco SPA112 using its web ui.

reboot-spa112.sh

#!/bin/bash
#
# Reboot a Cisco SPA112 using its web ui.
# Tested on firmware v1.4.1 (002).
# 
# Written by Ian Wilson <[email protected]> on 2017-03-07

DEVICE_IP=192.168.1.42
USER=admin
PASSWORD=hunter2

# Port of the en_value() javascript function from Login.asp on the SPA112.
encode_password () {
  # Append the password length (0-padded) to the password.
  local password_hash="$(printf "%s%02d" ${PASSWORD} ${#PASSWORD})"

  # Repeat the string until it is longer than 64 characters.
  while [[ ${#password_hash} -lt 64 ]]; do
    password_hash+="${password_hash}"
  done

  # Return a MD5 hash of the first 64 characters.
  echo -n "${password_hash:0:64}" | md5sum
}

# Submit the login form.
echo -n "Logging in..."
login_response=$(curl \
  --silent \
  --data "submit_button=login&keep_name=0&enc=1&user=${USER}&pwd=$(encode_password)" \
  "http://${DEVICE_IP}/login.cgi")

# Parse the response to see if login was successful.
if [[ ${login_response} =~ "var session_key" ]]; then
  echo "success!"
else
  echo "failed."
  exit 1
fi

# Get session key from the response.
echo -n "Grabbing session key..."
session_key="$(echo "${login_response}" | sed --silent --regexp-extended "s/var session_key='([0-9a-f]{32})';/\1/p")"

# Check if the session key is empty.
if [[ -z "${session_key}" ]]; then
  echo "failed."
  exit 1
else
  echo "success!"
fi

# Submit the reboot form.
echo -n "Sending reboot command..."
reboot_response=$(curl \
  --silent \
  --data "submit_button=Reboot&gui_action=Apply&need_reboot=1&session_key=${session_key}" \
  "http://${DEVICE_IP}/apply.cgi;session_id=${session_key}")

# Parse the response to see if a reboot was started.
if [[ ${reboot_response} =~ "You will be returned to the Login page in a few minutes" ]]; then
  echo "success!"
else
  echo "failed."
  exit 1
fi

# Exit.
exit 0