def dailysummary(start_date=None, end_date=None, return_format=None):
    """Returns daily summary totals of targets, attacks and sources. Limit to
    30 days at a time. (Query 2002-01-01 to present)

    In the return data:

    Sources: Distinct source IP addresses the packets originate from.
    Targets: Distinct target IP addresses the packets were sent to.
    Reports: Number of packets reported.

    :param start_date: string or datetime.date(), default is today
    :param end_date: string or datetime.date(), default is today
    """
    uri = 'dailysummary'

    if not start_date:
        # default today
        start_date = datetime.datetime.now()

    try:
        uri = '/'.join([uri, start_date.strftime("%Y-%m-%d")])
    except AttributeError:
        uri = '/'.join([uri, start_date])
    if end_date:
        try:
            uri = '/'.join([uri, end_date.strftime("%Y-%m-%d")])
        except AttributeError:
            uri = '/'.join([uri, end_date])
    return _get(uri, return_format)