Set the SSID / password on C4000BG DSL modems

c4000-ssid.sh

#!/bin/bash

# Set the SSID / password on C4000BG DSL modems
#
# WARNING: This script does no sanity checking! It does not check
# that the SSID is available, or that it is even well-formed (i.e.
# 32 octets or less in length). Be careful!

set -e

COOKIE_FILE=cookies.txt
trap "rm \"${COOKIE_FILE}\"" EXIT

CURL_OPTS="--insecure --fail-with-body --connect-timeout 5 --cookie-jar \"${COOKIE_FILE}\" --cookie \"${COOKIE_FILE}\""

function urlencode {
    python -c "import urllib.parse; print(urllib.parse.quote_plus('$*'))"
}

function prompt {
    echo -n "${1}"
    read ${2}
}

function login {
    prompt "LOGIN Username: " LOGIN_USERNAME
    prompt "LOGIN Password: " LOGIN_PASSWORD

    ESC_LOGIN_USERNAME=$(urlencode "${LOGIN_USERNAME}")
    ESC_LOGIN_PASSWORD=$(urlencode "${LOGIN_PASSWORD}")
    POST_DATA="username=${ESC_LOGIN_USERNAME}&password=${ESC_LOGIN_PASSWORD}"

    echo "Logging in..."
    curl ${CURL_OPTS} \
         --data "${POST_DATA}" \
         "https://${ADDRESS}/cgi/cgi_action"
}

function set_wifi_params {
    prompt "Wifi SSID: " WIFI_SSID
    prompt "Wifi Password: " WIFI_PASSWORD

    ESC_WIFI_SSID=$(urlencode "${WIFI_SSID}")
    ESC_WIFI_PASSWORD=$(urlencode "${WIFI_PASSWORD}")
    POST_DATA="Object=Device.WiFi.SSID.1&Operation=Modify&SSID=${ESC_WIFI_SSID}&Object=Device.WiFi.AccessPoint.1.Security&Operation=Modify&ModeEnabled=WPA2-Personal&KeyPassphrase=${ESC_WIFI_PASSWORD}&Object=Device.WiFi.AccessPoint.1&Operation=Modify&SSIDAdvertisementEnabled=true&Object=Device.WiFi.SSID.2&Operation=Modify&SSID=${ESC_WIFI_SSID}&Object=Device.WiFi.AccessPoint.2.Security&Operation=Modify&ModeEnabled=WPA2-Personal&KeyPassphrase=${ESC_WIFI_PASSWORD}&Object=Device.WiFi.AccessPoint.2&Operation=Modify&SSIDAdvertisementEnabled=true"

    echo "Setting Wifi parameters..."
    curl ${CURL_OPTS} \
         --header "X-Requested-With: XMLHttpRequest" \
         --data "${POST_DATA}" \
         "https://${ADDRESS}/cgi/cgi_set"
}

prompt "Router address: " ADDRESS
login
set_wifi_params