+ from xdg import BaseDirectory
+ return os.path.join(BaseDirectory.xdg_config_home, "dyn-nsupdate")
+ except ImportError:
+ return os.path.expanduser("~/.config/dyn-nsupdate")
+
+def urlopen(url, config):
+ if sys.version_info >= (3, 4, 3):
+ return urllib.request.urlopen(url, context=sslContext(config)).read().decode('utf-8').strip()
+ else:
+ return urllib.request.urlopen(url).read().decode('utf-8').strip()
+
+def getMyIP(family, config, methods = {}, verbose = 0):
+ '''Returns our current IP address (<family> can be "IPv4" or "IPv6"), detected as given by the configuration.
+ Additional detection methods can be supplied via <methods>.'''
+ method = config[family]['method']
+ if method == 'none':
+ return None
+ elif method == 'web':
+ server = config[family].get('server', config['DEFAULT']['server'])
+ url = 'https://'+server+'/checkip'
+ try:
+ ip = urlopen(url, config)
+ except urllib.error.URLError:
+ raise Exception("Error fetching {}, make sure the URL is correct and the internet connection actually works.".format(url))
+ if verbose >= VERBOSE_FULL:
+ print("Server",server,"says my",family,"is",ip)
+ return ip
+ elif method in methods:
+ return methods[method]()
+ else:
+ raise Exception("Unsupported "+family+" detection method: "+method)
+
+def getMyIPv4(config, verbose = 0):
+ '''Returns our current IPv4 address, detected as given by the configuration'''
+ return getMyIP("IPv4", config, verbose=verbose)
+
+def getMyIPv6(config, verbose = 0):
+ '''Returns our current IPv6 address, detected as given by the configuration'''
+ def local():
+ out = subprocess.check_output(["ip", "addr"])
+ for line in out.decode('utf-8').split('\n'):
+ m = re.search('inet6 ([a-fA-F0-9:]+)/64 ([a-zA-Z0-9 ]*)', line)
+ if m is not None:
+ ip = m.group(1)
+ flags = m.group(2).split()
+ if not 'temporary' in flags and not 'deprecated' in flags and not "link" in flags:
+ if verbose >= VERBOSE_FULL:
+ print("Local IPv6 detected to be",ip)
+ return ip
+ raise Exception("Unable to detect correct local IPv6 address")
+ return getMyIP("IPv6", config, methods={'local': local}, verbose=verbose)
+
+def getCurIP(domain, family):
+ '''Return the current IP of the given <domain>. <family> can be socket.AF_INET or socket.AF_INET6.'''
+ try:
+ addr = socket.getaddrinfo(domain, None, family=family)
+ return addr[0][4][0]