def get_name_servers(self, uri):
""" Returns a list of name servers for uri (authority).
If it does not found any NS for uri, it retries with the upper level.
It uses a shared dictionary internally (across all threads) to avoid
redoing the same query multiple times. """
res = None
r = self.myresolver
try:
res = r.query(uri, 'NS')
except dns.resolver.NoAnswer:
# This may be CNAME redirected
red = self.detect_cname_redirected(uri)
if red != []:
res = self.get_name_servers(red[-1][2])
except Exception:
res = [] # give up (NXDOMAIN or Timeout or NoNameservers)
if res is None:
# try to go up
if uri != reg_dom.split_domainname(uri)[2]:
new_uri = uri[uri.find('.') + 1:]
res = self.get_name_servers(new_uri)
else:
# We just tested a TLD and we did not found any NS?
# We may have a problem here :-(
res = []
if type(res) == dns.resolver.Answer:
res = [a.to_text() for a in res]
return res
def get_name_servers(self, uri):
""" Returns a list of name servers for uri (authority).
If it does not found any NS for uri, it retries with the upper level.
It uses a shared dictionary internally (across all threads) to avoid
redoing the same query multiple times. """
res = None
r = self.myresolver
try:
res = r.query(uri, "NS")
except dns.resolver.NoAnswer:
# This may be CNAME redirected
red = self.detect_cname_redirected(uri)
if red != []:
res = self.get_name_servers(red[-1][2])
except Exception:
res = [] # give up (NXDOMAIN or Timeout or NoNameservers)
if res is None:
# try to go up
if uri != reg_dom.split_domainname(uri)[2]:
new_uri = uri[uri.find(".") + 1 :]
res = self.get_name_servers(new_uri)
else:
# We just tested a TLD and we did not found any NS?
# We may have a problem here :-(
res = []
if type(res) == dns.resolver.Answer:
res = [a.to_text() for a in res]
return res
def authority_info(auth):
''' Get the registered domain, the TLD and the AS number of auth. '''
if auth == '':
return '', '', ''
try:
# Sometime, auth can be an IP...
dns.inet.af_for_address(auth)
return '', '', ''
except Exception:
# If it's IPv6, it's written between square brackets
try:
dns.inet.af_for_address(auth[1:-1])
return '', '', ''
except Exception:
pass
(garbage, rd, tld) = reg_dom.split_domainname(auth)
return rd + '.' + tld, tld, get_asn(auth)
def authority_info(auth):
""" Get the registered domain, the TLD and the AS number of auth. """
if auth == "":
return "", "", ""
try:
# Sometime, auth can be an IP...
dns.inet.af_for_address(auth)
return "", "", ""
except Exception:
# If it's IPv6, it's written between square brackets
try:
dns.inet.af_for_address(auth[1:-1])
return "", "", ""
except Exception:
pass
(garbage, rd, tld) = reg_dom.split_domainname(auth)
return rd + "." + tld, tld, get_asn(auth)
