def main(self, min_len=(1, ), max_len=(3, )):
"""
Main function
"""
try:
min_len = int(min_len[0])
max_len = int(max_len[0])
except TypeError:
self._write_result("Min and max length should be integer values.")
return
if min_len > max_len or min_len <= 0:
self._write_result(
"Min length should be greater than 0 and less or equal to max length."
)
return
if not self.host:
return
if self.host.startswith("www."):
self.host = self.host[4:]
# collect nameservers
r = Resolver()
r.lifetime = self.DNS_TIMEOUT
name_servers = r.query(self.host, "NS")
name_servers = map(lambda x: str(x), name_servers)
ns_list = []
for name_server in name_servers:
if name_server[-1] == ".":
name_server = name_server[:-1]
ns_list.append(gethostbyname(name_server))
r = Resolver()
r.lifetime = self.DNS_TIMEOUT
r.nameservers = ns_list
results = set()
for sub in self.generate_subdomains(min_len, max_len):
domain = "%s.%s" % (sub, self.host)
for record in ("A", "CNAME"):
try:
records = r.query(domain, record)
if records:
if sub not in results:
results.add(sub)
self._write_result(domain)
break
except Exception:
pass
def reverse_dns_lookup(input, timeout=3, server=""):
"""Perform a simple reverse DNS lookup, return results in a dictionary"""
assert _REVERSE_DNS_REGEX.search(
input), "Invalid address format: '{0}'".format(input)
resolver = Resolver()
resolver.timeout = float(timeout)
resolver.lifetime = float(timeout)
if server:
resolver.nameservers = [server]
try:
tmp = input.strip().split(".")
tmp.reverse()
inaddr = ".".join(tmp) + ".in-addr.arpa"
records = resolver.query(inaddr, "PTR")
return {
"name": records[0].to_text(),
"lookup": inaddr,
"error": "",
"addr": input,
}
except DNSException as e:
return {
"addrs": [],
"lookup": inaddr,
"error": repr(e),
"name": input,
}
def check_dns(check):
# Setup the resolver
resolver = Resolver()
resolver.nameservers = [check.config['HOST']]
resolver.timeout = dns_config['timeout']
resolver.lifetime = dns_config['lifetime']
# Query resolver
check.add_output('Querying {HOST} for "{LOOKUP}"...', **check.config)
lookup = resolver.query(check.config['LOOKUP'], check.config['TYPE'])
found = False
for ans in lookup:
if str(ans) == check.config['EXPECTED']:
found = True
else:
check.addOutput('NOTICE: DNS Server returned {}', ans)
if not found:
check.addOutput(
'ERROR: DNS Server did not respond with the correct IP')
return False
# We're good!
return True
def takeOver(domain):
A = []
CNAME = []
results = []
resolver = Resolver()
resolver.timeout = 1
resolver.lifetime = 1
types = ["A", "CNAME"]
for type in types:
try:
answers = resolver.query(domain, type)
for answer in answers:
if type == "A":
A.append(answer.address)
if type == "CNAME":
CNAME.append(answer.target)
except (NXDOMAIN, NoAnswer, EmptyLabel, NoNameservers, Timeout,
DNSException):
pass
except Exception:
return None
results = identify(domain, A, CNAME)
return results
def smugmug(domain, ARecords, CNAME):
outcome = []
try:
if get("http://" + domain, headers=headers).status_code == 404:
outcome = ["Smugmug", domain, CNAME]
return outcome
except Exception:
pass
try:
if get("https://" + domain, headers=headers,
verify=False).status_code == 404:
outcome = ["Smugmug", domain, CNAME]
return outcome
except Exception:
pass
resolver = Resolver()
resolver.timeout = 1
resolver.lifetime = 1
try:
resolver.query(CNAME)
except NXDOMAIN:
outcome = ["Smugmug", domain, CNAME]
return outcome
def cname(self, dom: Domain, timeout: int) -> List[int]:
"""Collect CNAME records on domain."""
# List of domains to check
dom_list = [dom.url, "www." + dom.url]
# Our codes to return
return_code = []
# Seutp resolver and timeouts
resolver = Resolver()
resolver.timeout = timeout
resolver.lifetime = LIFETIME
cname_query = resolver.query
# Iterate through all domains in list
for domain in dom_list:
try:
response = cname_query(domain, "cname")
dom.cnames = [record.to_text() for record in response]
except NoAnswer:
return_code.append(1)
except NoNameservers:
return_code.append(2)
except NXDOMAIN:
return_code.append(3)
except Timeout:
return_code.append(4)
return return_code
def dns(self, name, qtype):
"""DNS query.
If the result is in cache, return that. Otherwise pull the
result from DNS, and cache ALL answers, so additional info
is available for further queries later.
CNAMEs are followed.
If there is no data, [] is returned.
pre: qtype in ['A', 'AAAA', 'MX', 'PTR', 'TXT', 'SPF']
post: isinstance(__return__, types.ListType)
"""
result = self.cache.get( (name, qtype) )
cname = None
if not result:
req = Resolver()
req.lifetime = self.timeout
resp = req.query(name, qtype)
for a in resp:
# key k: ('wayforward.net', 'A'), value v
k, v = (name, qtype), a
if k == (name, 'CNAME'):
cname = v
self.cache.setdefault(k, []).append(v)
result = self.cache.get( (name, qtype), [])
if not result and cname:
result = self.dns(cname, qtype)
return result
def reverse_dns_lookup(input, timeout=3, server=''):
"""Perform a simple reverse DNS lookup, return results in a dictionary"""
assert _REVERSE_DNS_REGEX.search(
input), "Invalid address format: '{0}'".format(input)
resolver = Resolver()
resolver.timeout = float(timeout)
resolver.lifetime = float(timeout)
if server:
resolver.nameservers = [server]
try:
tmp = input.strip().split('.')
tmp.reverse()
inaddr = '.'.join(tmp) + ".in-addr.arpa"
records = resolver.query(inaddr, 'PTR')
return {
'name': records[0].to_text(),
'lookup': inaddr,
'error': '',
'addr': input,
}
except DNSException as e:
return {
'addrs': [],
'lookup': inaddr,
'error': repr(e),
'name': input,
}
def reverse_dns_lookup(input, timeout=3, server=''):
"""Perform a simple reverse DNS lookup, return results in a dictionary"""
assert _REVERSE_DNS_REGEX.search(
input), "Invalid address format: '{0}'".format(input)
resolver = Resolver()
resolver.timeout = float(timeout)
resolver.lifetime = float(timeout)
if server:
resolver.nameservers = [server]
try:
tmp = input.strip().split('.')
tmp.reverse()
inaddr = '.'.join(tmp) + ".in-addr.arpa"
records = resolver.query(inaddr, 'PTR')
return {
'name': records[0].to_text(),
'lookup': inaddr,
'error': '',
'addr': input,
}
except DNSException as e:
return {
'addrs': [],
'lookup': inaddr,
'error': repr(e),
'name': input,
}
def dns_resolver():
"""
dns解析器
"""
resolver = Resolver()
resolver.nameservers = config.resolver_nameservers
resolver.timeout = config.resolver_timeout
resolver.lifetime = config.resolver_lifetime
return resolver
def dns_resolver():
"""
dns解析器
"""
resolver = Resolver()
resolver.nameservers = Oneforall.resolver_nameservers
resolver.timeout = Oneforall.resolver_timeout
resolver.lifetime = Oneforall.resolver_lifetime
return resolver
def dns_resolver():
"""
dns解析器
"""
resolver = Resolver()
resolver.nameservers = settings.resolver_nameservers
resolver.timeout = settings.resolver_timeout
resolver.lifetime = settings.resolver_lifetime
return resolver
def query_dns_server(record, type):
resolver = Resolver(configure=False)
resolver.nameservers = [socket.gethostbyname(auth_ns)]
resolver.timeout = 5
resolver.lifetime = 5
try:
dns_query = resolver.query(record, type)
return dns_query
except NXDOMAIN:
return False
def checkWildcard(timestamp, domain):
resolver = Resolver()
resolver.timeout = 1
resolver.lifetime = 1
try:
return (domain, gethostbyname_ex(".".join([str(timestamp),
domain]))[2])
except Exception:
return (domain, None)
def fqdn_ip(fqdn):
"""
Returns the list of IPs for a fqdn
"""
resolvers = dict()
resolvers['local'] = dict()
resolvers['private'] = dict()
local_resolver = Resolver()
local_resolver.timeout = 2
local_resolver.lifetime = 2
resolvers['local']['resolver'] = local_resolver
private_resolver = Resolver()
private_resolver.timeout = 2
private_resolver.lifetime = 2
private_resolver.nameservers = settings.PRIVATE_DNS_RESOLVERS
resolvers['private']['resolver'] = private_resolver
for resolver_name in resolvers:
resolvers[resolver_name]['result'] = resolve_fqdn_ip(
fqdn, resolvers[resolver_name]['resolver'], resolver_name)
result_quorum = dict()
result_quorum['No IP'] = 0
result_ip = 'No IP'
for resolver_name in resolvers:
if resolvers[resolver_name]['result'] == 'No IP':
return 'No IP'
_ip = resolvers[resolver_name]['result']
if _ip not in result_quorum:
result_quorum[_ip] = 1
else:
result_quorum[_ip] += 1
if _ip != result_ip and result_quorum[_ip] > result_quorum[result_ip]:
result_ip = _ip
return result_ip
def lookup(servers, domain):
dns_resolver = Resolver()
dns_resolver.nameservers = servers
dns_resolver.lifetime = 3
try:
# python 3.9 query deprecation
if sys.version_info.minor < 9:
answer = dns_resolver.query(domain)
else:
answer = dns_resolver.resolve(domain)
return [x.to_text() for x in answer]
except (DNSException, ValueError) as e:
pass
return []
def parse_dnsname(host_input):
output = []
try:
res = Resolver()
res.timeout = 3
res.lifetime = 3
dns_query = res.query(host_input, "A")
dns_query.nameservers = ['8.8.8.8', '8.8.4.4']
for ip in dns_query:
if REGEX['single'].match(str(ip)):
output.append(str(ip))
except:
raise Exception('Could not Resolve \'{}\'\n'.format(host_input))
return output
def parse_dnsname(host_input, ns=[]):
output = []
try:
res = Resolver()
res.timeout = 3
res.lifetime = 3
if ns:
res.nameservers = ns
for ip in res.query(host_input, "A"):
if REGEX['single'].match(str(ip)):
output.append(str(ip))
except:
raise Exception('Could not Resolve \'{}\'\n'.format(host_input))
return output
def findNX(domainToTry):
resolver = Resolver()
resolver.timeout = 1
resolver.lifetime = 1
try:
resolver.query(domainToTry)
except NXDOMAIN:
return True
except Exception:
pass
return False
def resolve_host(host, dns_server):
# Reuses ldap_srv value to resolve dns names (Assumes this is a DC)
try:
res = Resolver()
res.timeout = 3
res.lifetime = 3
res.nameservers = [dns_server]
dns_query = res.query(host, "A")
for ip in dns_query:
return ip
except KeyboardInterrupt:
exit(0)
except:
pass
return ''
def perform_lookup(server, domain, timeout=3, tries=1):
# create DNS resolver
dns_resolver = Resolver()
dns_resolver.nameservers = [server]
dns_resolver.lifetime = timeout
# try (tries) times
for _ in range(0, tries):
try:
answer = dns_resolver.query(domain)
return [r.to_text() for r in answer]
except (DNSException, ValueError) as e:
pass
return None
def dns_resolver():
"""
dns解析器
"""
resolver = Resolver()
resolver.nameservers = [
'223.5.5.5', # AliDNS
'119.29.29.29', # DNSPod
'114.114.114.114', # 114DNS
'8.8.8.8', # Google DNS
'1.1.1.1' # CloudFlare DNS
]
resolver.timeout = 5.0
resolver.lifetime = 10.0
return resolver
def dns6_lookup(input, timeout=3, server=''):
"""Perform a simple DNS lookup, return results in a dictionary"""
resolver = Resolver()
resolver.timeout = float(timeout)
resolver.lifetime = float(timeout)
if server:
resolver.nameservers = [server]
try:
records = resolver.query(input, 'AAAA')
return {'addrs': [ii.address for ii in records],
'error': '',
'name': input,
}
except DNSException as e:
return {'addrs': [],
'error': repr(e),
'name': input,
}
def dns6_lookup(input, timeout=3, server=''):
"""Perform a simple DNS lookup, return results in a dictionary"""
resolver = Resolver()
resolver.timeout = float(timeout)
resolver.lifetime = float(timeout)
if server:
resolver.nameservers = [server]
try:
records = resolver.query(input, 'AAAA')
return {'addrs': [ii.address for ii in records],
'error': '',
'name': input,
}
except DNSException as e:
return {'addrs': [],
'error': repr(e),
'name': input,
}
def query(domain, query_type, timeout=5.0):
answers = []
res_list = []
resl = Resolver()
resl.timeout = timeout
resl.lifetime = 2.0
try:
answers = resl.query(domain, query_type)
except Exception as e:
pass
for dns_domain in answers:
try:
res_list.append(str(dns_domain).rstrip('.'))
except socket.gaierror as e: # skip non resolvable name server
pass
return res_list
def retrieveDNSRecords(db, domain):
resolver = Resolver()
resolver.timeout = 1
resolver.lifetime = 1
types = ["A", "MX", "NS", "AAAA", "SOA", "TXT"]
timestamp = int(time())
print(colored("[*]-Retrieving DNS Records...", "yellow"))
for type in types:
try:
answers = resolver.query(domain, type)
for answer in answers:
if type == "A":
db.add(Record(domain=domain, type=type, value=answer.address, timestamp=timestamp))
if type == "MX":
db.add(Record(domain=domain, type=type, value=answer.exchange.to_text()[:-1], timestamp=timestamp))
if type == "NS":
db.add(Record(domain=domain, type=type, value=answer.target.to_text()[:-1], timestamp=timestamp))
if type == "AAAA":
db.add(Record(domain=domain, type=type, value=answer.address, timestamp=timestamp))
if type == "SOA":
db.add(Record(domain=domain, type=type, value=answer.mname.to_text()[:-1], timestamp=timestamp))
if type == "TXT":
db.add(Record(domain=domain, type=type, value=str(answer), timestamp=timestamp))
try:
db.commit()
except (IntegrityError, FlushError):
db.rollback()
except Exception as e:
pass
for row in db.query(Record).filter(Record.domain == domain).order_by(Record.type):
print(" \__ {0}: {1}".format(colored(row.type, "cyan"), colored(row.value, "yellow")))
def process(self, headers, content):
request = Services.get("request_factory")
hostname = urlparse(request.url).hostname
try:
resolver = Resolver(configure=False)
resolver.nameservers = [settings.dns_resolver]
resolver.timeout = 2
resolver.lifetime = 2
dns_query = resolver.query(hostname + ".cdn.cloudflare.net", "A")
if len(dns_query) > 0:
return "Cloudflare CDN"
except NXDOMAIN:
pass
except NoAnswer:
pass
except Timeout:
pass
def emitter(self):
try:
if self.PROPERTIES['resolvers']['Value']:
nameservers = [
x.strip()
for x in self.PROPERTIES['resolvers']['Value'].split(',')
]
nameservers = self.PROPERTIES['resolvers']['Value'].split(',')
else:
nameservers = get_default_resolver().nameservers
for payload in self.encoder(self.payload):
try:
if self.PROPERTIES['subdomain']['Value']:
dnsname = '%s.%s.%s.' % (
self.dnsb64escape(payload),
self.PROPERTIES['subdomain']['Value'],
self.PROPERTIES['domain']['Value'])
else:
dnsname = '%s.%s.' % (self.dnsb64escape(
payload), self.PROPERTIES['domain']['Value'])
print nameservers
for ns in nameservers:
r = Resolver()
r.lifetime = 1
print ns, dnsname
r.nameservers = [ns]
try:
r.query(dnsname, 'A', raise_on_no_answer=False)
except Timeout:
pass # Timed out, that's fine
except Exception as e:
self.logger.error('Exception in %s: %s' %
(self.__class__.__name__, e))
pass
except Exception as e:
raise
return True
def dns6_lookup(input, timeout=3, server=""):
"""Perform a simple DNS lookup, return results in a dictionary"""
resolver = Resolver()
resolver.timeout = float(timeout)
resolver.lifetime = float(timeout)
if server:
resolver.nameservers = [server]
try:
records = resolver.query(input, "AAAA")
return {
"addrs": [ii.address for ii in records],
"error": "",
"name": input,
}
except DNSException as e:
return {
"addrs": [],
"error": repr(e),
"name": input,
}
def process(self, headers, content):
request = Services.get('request_factory')
hostname = urlparse(request.url).hostname
try:
resolver = Resolver(configure=False)
resolver.nameservers = [settings.dns_resolver]
resolver.timeout = 2
resolver.lifetime = 2
dns_query = resolver.query(hostname + ".edgekey.net", 'A')
if len(dns_query) > 0:
return "Akamai CDN"
except NXDOMAIN:
pass
except NoAnswer:
pass
except Timeout:
pass
def get_ip_from_nameserver(self, hostname, dns_ip):
a_records = []
resolver = Resolver()
resolver.nameservers = [dns_ip]
resolver.timeout = 1
resolver.lifetime = 1
try:
for rdata in resolver.query(hostname, 'A'):
a_records.append(str(rdata))
except NoAnswer:
return None
except NXDOMAIN:
return None
except NoNameservers:
return None
except Timeout:
return None
return (a_records[0])
def resolve(self, name, rrtype):
domain = dns.name.from_text(name)
dnsResolver = Resolver()
dnsResolver.lifetime = 5
# just an example
result = ''
try:
answers = dnsResolver.query(domain, rrtype)
for answer in answers:
if rrtype == 'MX':
result = answer.exchange
logging.debug('%s is %s' % (rrtype, result))
else:
raise Exception("unsupported type!")
except DNSException as ex:
logging.error("resolve() DNSException: %s" % ex.__class__)
raise Exception(ex.__class__)
except Exception as ex:
logging.error("resolve() exception: %s" % ex)
raise ex
return result
def resolve(self, name, rrtype):
domain = dns.name.from_text(name)
dnsResolver = Resolver()
dnsResolver.lifetime = 5
# just an example
result = ''
try:
answers = dnsResolver.query(domain, rrtype)
for answer in answers:
if rrtype == 'MX':
result = answer.exchange
logging.debug('%s is %s' % (rrtype, result))
else:
raise Exception("unsupported type!")
except DNSException as ex:
logging.error("resolve() DNSException: %s" % ex.__class__)
raise Exception(ex.__class__)
except Exception as ex:
logging.error("resolve() exception: %s" % ex)
raise ex
return result
def check_dns(check, data):
check.addOutput("ScoreEngine: {} Check\n".format(check.getServiceName()))
check.addOutput("EXPECTED: Sucessful and correct query against the DNS server")
check.addOutput("OUTPUT:\n")
# Setup the resolver
resolv = Resolver()
resolv.nameservers = [data["HOST"]]
resolv.timeout = dns_config["timeout"]
resolv.lifetime = dns_config["lifetime"]
check.addOutput("Starting check...")
try:
# Query resolver
check.addOutput("Querying {HOST} for '{LOOKUP}'...".format(**data))
lookup = resolv.query(data["LOOKUP"], data["TYPE"])
found = False
for ans in lookup:
if str(ans) == data["EXPECTED"]:
found = True
else:
check.addOutput("NOTICE: DNS Server returned {}".format(ans))
if not found:
check.addOutput("ERROR: DNS Server did not respond with the correct IP")
return
# We're good!
check.setPassed()
check.addOutput("Check successful!")
except Exception as e:
check.addOutput("ERROR: {}: {}".format(type(e).__name__, e))
return
def main():
# parse and check command line args
(options, args) = parse_args()
if (len(options.ensure_value('resolvers', [])) != 2
or len(args) != 1):
usage()
sys.exit()
if options.run_tests:
test()
sys.exit()
#copy arg values from parser output
resolver_ips = options.resolvers
verbose = options.verbose
question_file = args[0]
ttl_tolerance = int(options.ttl_tolerance)
side_by_side = options.side_by_side
#create dns resolvers (no dnssec for now)
#source_ips is a list parallel to resolvers that contains the IPv4 address
#to bind the query source address to -so you can control which interface the
#query comes from - useful for testing on a machine with multiple nics.
resolvers = []
source_ips = []
for resolver_ip in resolver_ips:
resolver = Resolver()
if resolver_ip.find('/') > 0:
parts = resolver_ip.split('/')
resolver.nameservers = [parts[0]]
source_ips.append(parts[1])
else:
resolver.nameservers = [resolver_ip]
source_ips.append(None)
resolver.retry_servfail = True
#resolver.use_edns(0, DO, 1200)
resolver.lifetime = 5
resolvers.append(resolver)
#only compare 2 resolvers for now
if len(resolvers) > 2:
print("only 2 resolvers allowed for now..., picking first 2")
resolvers = resolvers[:2]
#loop over the question input and compare the results from the resolvers
lineno = 0
for line in file(question_file):
#allow blank lines or lines that start with #
if len(line.strip()) == 0 or line.lstrip().startswith("#"):
continue
#assume anything else is a question: <name> <rdtype> [<rdclass>]
parts = line.strip().split(' ')
name = parts[0].strip()
rdtype = parts[1].strip()
rdclass = parts[2].strip() if len(parts) > 2 else 'IN'
lineno += 1
results = []
rtt_time = []
for resolver, source_ip in zip(resolvers, source_ips):
try:
start_time = time.time()
result = resolver.query(name, rdtype, rdclass, source=source_ip, raise_on_no_answer=False)
end_time = time.time()
results.append(result)
rtt_time.append(end_time - start_time)
except NXDOMAIN, nxd:
results.append(nxd)
rtt_time.append(-1)
except YXDOMAIN, yxd:
results.append(yxd)
rtt_time.append(-1)
except NoAnswer, noa:
results.append(noa)
rtt_time.append(-1)
def dns_query(input="", query_type="", server="", timeout=2.0):
"""A unified IPv4 & IPv6 DNS lookup interface; this is essentially just a wrapper around dnspython's API. When you query a PTR record, you can use an IPv4 or IPv6 address (which will automatically be converted into an in-addr.arpa name. This wrapper only supports a subset of DNS records: 'A', 'AAAA', 'CNAME', 'MX', 'NS', 'PTR', and 'TXT'
Kwargs:
- input (str): A string containing the DNS record to lookup
- query_type (str): A string containing the DNS record type (SOA not supported)
- server (str): A string containing the fqdn or IP address of the dns server
- timeout (float): DNS lookup timeout duration (default: 2.0 seconds)
Returns:
A set() of :class:`~ccp_util.DNSResponse` instances
>>> from ciscoconfparse.ccp_util import dns_query
>>> dns_query('www.pennington.net', "A", "4.2.2.2")
set([<DNSResponse "A" result_str="65.19.187.2">])
>>> answer = dns_query('www.pennington.net', 'A', '4.2.2.2')
>>> str(answer.pop())
'65.19.187.2'
>>>
"""
valid_records = set(['A', 'AAAA', 'AXFR', 'CNAME', 'MX', 'NS', 'PTR',
'TXT'])
query_type = query_type.upper()
assert query_type in valid_records
assert server!=""
assert float(timeout)>0
assert input != ""
intput = input.strip()
retval = set([])
resolver = Resolver()
resolver.server = [socket.gethostbyname(server)]
resolver.timeout = float(timeout)
resolver.lifetime = float(timeout)
start = time.time()
if (query_type=="A") or (query_type=="AAAA"):
try:
answer = resolver.query(input, query_type)
duration = time.time() - start
for result in answer:
response = DNSResponse(query_type=query_type,
duration=duration,
input=input, result_str = str(result.address))
retval.add(response)
except DNSException as e:
duration = time.time() - start
response = DNSResponse(input=input,
duration=duration, query_type=query_type)
response.has_error = True
response.error_str = e
retval.add(response)
elif query_type=="AXFR":
"""This is a hack: return text of zone transfer, instead of axfr objs"""
_zone = zone.from_xfr(query.xfr(server, input, lifetime=timeout))
return [_zone[node].to_text(node) for node in _zone.nodes.keys()]
elif query_type=="CNAME":
try:
answer = resolver.query(input, query_type)
duration = time.time() - start
for result in answer:
response = DNSResponse(query_type=query_type,
duration=duration,
input=input, result_str = str(result.target))
retval.add(response)
except DNSException as e:
duration = time.time() - start
response = DNSResponse(input=input, duration=duration,
query_type=query_type)
response.has_error = True
response.error_str = e
retval.add(response)
elif query_type=="MX":
try:
answer = resolver.query(input, query_type)
duration = time.time() - start
for result in answer:
response = DNSResponse(query_type=query_type,
input=input, result_str = str(result.target))
response.preference = int(result.preference)
retval.add(response)
except DNSException as e:
duration = time.time() - start
response = DNSResponse(input=input, duration=duration,
query_type=query_type)
response.has_error = True
response.error_str = e
retval.add(response)
elif query_type=="NS":
try:
answer = resolver.query(input, query_type)
duration = time.time() - start
for result in answer:
response = DNSResponse(query_type=query_type,
duration=duration,
input=input, result_str = str(result.target))
retval.add(response)
except DNSException as e:
duration = time.time() - start
response = DNSResponse(input=input,
duration=duration, query_type=query_type)
response.has_error = True
response.error_str = e
retval.add(response)
elif query_type=="PTR":
if is_valid_ipv4_addr(input) or is_valid_ipv6_addr(input):
inaddr = reversename.from_address(input)
elif 'in-addr.arpa' in input.lower():
inaddr = input
else:
raise ValueError('Cannot query PTR record for "{0}"'.format(input))
try:
answer = resolver.query(inaddr, query_type)
duration = time.time() - start
for result in answer:
response = DNSResponse(query_type=query_type,
duration=duration,
input=inaddr, result_str = str(result.target))
retval.add(response)
except DNSException as e:
duration = time.time() - start
response = DNSResponse(input=input,
duration=duration,
query_type=query_type)
response.has_error = True
response.error_str = e
retval.add(response)
elif query_type=="TXT":
try:
answer = resolver.query(input, query_type)
duration = time.time() - start
for result in answer:
response = DNSResponse(query_type=query_type,
duration=duration,
input=inaddr, result_str = str(result.strings))
retval.add(response)
except DNSException as e:
duration = time.time() - start
response = DNSResponse(input=input,
duration=duration, query_type=query_type)
response.has_error = True
response.error_str = e
retval.add(response)
return retval