#!/usr/bin/python

import os
import httplib
import sys

KEY_FILE = os.path.expanduser('~/.freedns.key')
KEY = open(KEY_FILE).read().strip()

UPDATE_HOST = 'freedns.afraid.org'
UPDATE_PATH = '/dynamic/update.php?' + KEY


def update_response():
    conn = httplib.HTTPSConnection(UPDATE_HOST)
    conn.request('GET', UPDATE_PATH)
    return conn.getresponse()


if __name__ == '__main__':
    if '-?' in sys.argv or '-h' in sys.argv or '--help' in sys.argv:
        print 'USAGE: %s [-d] [-v]' % os.path.basename(__file__)
        print '  -d: additional debug output'
        print '  -q: quiet mode (do not print results)'
        sys.exit(0)

    r = update_response()
    if r.status != 200:
        print 'ERROR:', r.status, r.reason
        sys.exit(1)
    content = r.read().strip()

    debug = '-d' in sys.argv
    quiet = '-q' in sys.argv

    if debug:
        print 'DEBUG:', r.status, r.reason
        print 'DEBUG:', content

    if content.startswith('Updated'):
        # Response is known. IP was updated.
        if not quiet:
            ### need to extract the IP
            print 'IP updated; now:', content
        sys.exit(0)

    if content.startswith('ERROR: Address ') \
        and content.endswith(' has not changed.'):
        # Response is known. IP was not updated.
        if not quiet:
            print 'IP unchanged; still:', content[15:-17]
        sys.exit(0)

    # Unknown response.
    print 'WARNING: unknown response:   (IP may have been updated)'
    print '----'
    print content
    print '----'
    sys.exit(1)