WiIvrea_login.sh

##### WiIvrea Authentication for OpenWRT ####

is_authenticated(){
    local res=$(wget -q -O - http://172.172.172.1/login | grep "You are logged in" | wc -l)
    if [ $res = "1" ]
    then
        return 0 # true
    else
        return 1 # false
    fi
}

# authenticate user pass
authenticate(){
    local username=$1
    local password=$2

    echo "Authenticating $username $password" >&1

    # get chap_id and chap_challenge
    local login_data=$(wget -q -O - http://172.172.172.1/login)
    local id=$(echo "$login_data" | grep chap_id | cut -d '"' -f 6)
    local challenge=$(echo "$login_data" | grep challenge | cut -d '"' -f 6)
    
    # calculate chap_password
    local md5pass=$(echo -e -n "$id$password$challenge" | md5sum | cut -d ' ' -f 1)

    # send login request
    local post="username=$username&password=$md5pass&dst=http%3A%2F%2Fwww.google.it%2F&popup=1"
    local len=$(echo ${#post})
    local login_result=$(echo -e -n "POST /login HTTP/1.1\r\nContent-Length: $len\r\n\r\n$post" | nc 172.172.172.1 80 | grep "You are logged in" | wc -l)
    
    if [ $login_result = "1" ]
    then
        return 0 # success
    else
        return 1 # failure
    fi
}

#### main ####
if ! is_authenticated
then
    if authenticate $1 $2
    then
        echo "Logged in!" >&1
    else
        echo "Error logging in!" >&1
    fi
fi