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"""
ddupdate plugin to retrieve ipv6 address as seen from internet.
See: ddupdate(8)
"""
import urllib.request
import urllib.error
import re
from ddupdate.ddplugin import AddressPlugin, AddressError, IpAddr
TIMEOUT = 20
class DefaultWeb6Plugin(AddressPlugin):
"""
Get the external ipv6 address as seen from the web.
Relies on now-dns.com, falling back to ipv6.whatismyip.akamai.com
and ifcfg.me.
Options used: none
"""
_name = 'default-web-ip6'
_oneliner = 'Obtain external ipv6 address as seen from the net'
def get_ip(self, log, options):
"""Implement AddressPlugin.get_ip()."""
def check_url(url):
"""Get reply from host and decode."""
log.debug('trying ' + url)
try:
with urllib.request.urlopen(url, None, TIMEOUT) as response:
if response.getcode() != 200:
log.debug("Bad response at %s (ignored)" % url)
return None
html = response.read().decode()
except urllib.error.URLError as err:
log.debug("Got URLError: %s", err)
return None
log.debug("Got response: %s", html)
pat = re.compile(r'[:0-9a-f]{12,}(\s|\Z)')
match = pat.search(html)
if match:
return html[match.start(): match.end()]
log.debug("Cannot parse ipv6 address reply")
return None
urls = [
'https://now-dns.com/ip',
'http://ipv6.whatismyip.akamai.com',
'https://ifcfg.me/'
]
for ix, url in enumerate(urls):
log.info('Trying: %s', url)
ip = check_url(url)
if ip:
return IpAddr(None, ip)
if ix + 1 < len(urls):
log.info("Falling back to %s", urls[ix + 1])
raise AddressError(
"Cannot obtain ip6 address (%s, %s and %s tried)"
% tuple(urls))
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