dnsq-1.1.2/0000775000175000017500000000000012306436631013560 5ustar cgrewalcgrewal00000000000000dnsq-1.1.2/setup.cfg0000664000175000017500000000007312306436631015401 0ustar cgrewalcgrewal00000000000000[egg_info] tag_build = tag_date = 0 tag_svn_revision = 0 dnsq-1.1.2/setup.py0000664000175000017500000000066412306436560015301 0ustar cgrewalcgrewal00000000000000from setuptools import setup setup(name='dnsq', version='1.1.2', description='DNS Query Tool', long_description=open("README.rst").read(), author='Rackspace', author_email='admin@mailgunhq.com', license='Apache 2', url='http://www.mailgun.com', py_modules=['dnsq'], zip_safe=True, install_requires=[ 'dnspython==1.11.1', 'expiringdict==1.1', ], ) dnsq-1.1.2/dnsq.py0000664000175000017500000001405412305736752015111 0ustar cgrewalcgrewal00000000000000''' High-level DNS library built on top of dnspython. Only two functions matter here: - query_dns() : runs an arbitrary DNS query - mx_hosts_for() : returns a list of MX hosts for a given domain ''' import socket import time import dns import dns.exception import dns.resolver import dns.reversename import logging from collections import deque from itertools import groupby from random import shuffle from expiringdict import ExpiringDict log = logging.getLogger(__name__) # DNS resolver/cache for querying MX records DNS_CACHE_LIFE_SECONDS=240.0 DNS_TIMEOUT_SECONDS=3.0 # timeout per DNS server DNS_LIFETIME_TIMEOUT_SECONDS=5.2 # total timeout per DNS request PTR_CACHE_LEN=512 # This cache is used to store PTR records for IP addresses ptr_cache = ExpiringDict(max_len=PTR_CACHE_LEN, max_age_seconds=DNS_CACHE_LIFE_SECONDS) def query_dns(hostname, record_type, ns_server=None): """ Runs simple DNS queries, like: >>> query_dns('mailgun.net', 'txt') ['v=spf1 include:_spf.mailgun.org ~all'] """ try: # if nameserver was specified, convert it into IP: if ns_server: ips = query_dns(ns_server, 'A') if ips: ns_server = ips[0] records = exec_query(hostname, record_type, ns_server) if record_type.lower() == 'txt': return [record.to_text().strip("\"").replace('" "', '') for record in records] else: return [record.to_text() for record in records] # no entry? except (dns.resolver.NXDOMAIN, dns.resolver.NoAnswer, dns.resolver.NoNameservers) as e: return [] def mx_hosts_for(hostname): """ Returns a list of MX hostnames for a given domain name, sorted by their priority + randomization Note that if no MX records are found it falls back to default >>> mx_hosts_for('gmail.com') ['alt1.gmail-smtp-in.l.google.com', 'alt2.gmail-smtp-in.l.google.com'] Raises ecxeptions for network errors. """ retval = [] try: answers = sorted(exec_query(hostname, 'MX')) for mx_pref, grouper in groupby(answers, lambda entry: entry.preference): group = [entry.exchange.to_text() for entry in grouper] shuffle(group) retval += group # timeout, raise an exception - let them retry except dns.exception.Timeout: raise Exception("DNS failure for " + str(hostname)) # no MX record: except dns.resolver.NoAnswer as err: retval = [hostname] # invalid domain except dns.resolver.NXDOMAIN as err: retval = [] # empty label (ex: domain..com) except dns.name.EmptyLabel: retval = [] # strip ending . and filter None retval = [h.strip('.') for h in retval] return filter(lambda x: x, retval) def ptr_record_for(ipaddress): ''' Performs reverse DNS lookup on a given IP address. This is a replacement for socket.gethostbyaddr(), but with the following differences: - Returns None instead of throwing exceptions - It is fast: it will not block for 5+ seconds for IPs without PTRs - It is caching: it will be instant nearly all the time >>> ptr_record_for('127.0.0.1') "localhost" >>> ptr_record_for('74.125.224.123') "nuq04s08-in-f27.1e100.net" >>> ptr_record_for('74.125.224.1') None ''' if ipaddress == '127.0.0.1': return 'localhost' MISSING = "unknown" retval = None # see if we have it cached: cached_value = ptr_cache.get(ipaddress) if cached_value: return cached_value if cached_value != MISSING else None try: # get the in_addr.arpa name, like 142.224.125.74.in-addr.arpa. inaddr_arpa_name = dns.reversename.from_address(ipaddress).to_text() # now use ARPA name to query for PTR: hosts = query_dns(inaddr_arpa_name, "PTR") if hosts: retval = hosts[0].strip('.') ptr_cache[ipaddress] = retval # success: found the PTR record: return retval except: pass # no suitable PTR: ptr_cache[ipaddress] = MISSING return None def spf_record_for(hostname, bypass_cache=True): """Retrieves SPF record for a given hostname. According to the standard, domain must not have multiple SPF records, so if it's the case then an empty string is returned. """ try: primary_ns = None if bypass_cache: primary_ns = get_primary_nameserver(hostname) txt_records = query_dns(hostname, 'txt', primary_ns) spf_records = [r for r in txt_records if r.strip().startswith('v=spf')] if len(spf_records) == 1: return spf_records[0] except Exception as e: log.exception(e) return '' def exec_query(hostname, record_type, ns_server=None): """Execute a DNS query against a given name source. ns_server must be an IP address!!! """ try: # if nameserver specified then try it first if ns_server: resolver = get_resolver() resolver.nameservers = [ns_server] try: return resolver.query(hostname, record_type, tcp=True) except dns.exception.Timeout: pass # if it's not specified or timed out then use default nameserver return get_resolver().query(hostname, record_type, tcp=True) # in case of timeouts and socket errors return [] except dns.exception.Timeout: return [] except socket.error: return [] def get_resolver(): """Helper: return default DNS resolver object. """ resolver = dns.resolver.Resolver() resolver.timeout = DNS_TIMEOUT_SECONDS resolver.lifetime = DNS_LIFETIME_TIMEOUT_SECONDS return resolver def get_primary_nameserver(hostname): """Query DNS for the primary nameserver (SOA) for the given hostname. """ dq = deque(hostname.split('.')) while len(dq) > 1: soa = query_dns('.'.join(dq), 'SOA') if soa: return soa[0].split(" ")[0].strip(".") dq.popleft() dnsq-1.1.2/MANIFEST.in0000664000175000017500000000020012306436540015305 0ustar cgrewalcgrewal00000000000000recursive-include *.py include LICENSE/LICENSE_NOMINUM include LICENSE/LICENSE_RACKSPACE include README.rst include MANIFEST.in dnsq-1.1.2/dnsq.egg-info/0000775000175000017500000000000012306436631016217 5ustar cgrewalcgrewal00000000000000dnsq-1.1.2/dnsq.egg-info/SOURCES.txt0000664000175000017500000000037312306436626020112 0ustar cgrewalcgrewal00000000000000MANIFEST.in README.rst dnsq.py setup.py LICENSE/LICENSE_NOMINUM LICENSE/LICENSE_RACKSPACE dnsq.egg-info/PKG-INFO dnsq.egg-info/SOURCES.txt dnsq.egg-info/dependency_links.txt dnsq.egg-info/requires.txt dnsq.egg-info/top_level.txt dnsq.egg-info/zip-safednsq-1.1.2/dnsq.egg-info/requires.txt0000664000175000017500000000004312306436626020620 0ustar cgrewalcgrewal00000000000000dnspython==1.11.1 expiringdict==1.1dnsq-1.1.2/dnsq.egg-info/top_level.txt0000664000175000017500000000000512306436626020750 0ustar cgrewalcgrewal00000000000000dnsq dnsq-1.1.2/dnsq.egg-info/dependency_links.txt0000664000175000017500000000000112306436626022271 0ustar cgrewalcgrewal00000000000000 dnsq-1.1.2/dnsq.egg-info/PKG-INFO0000664000175000017500000000113612306436626017321 0ustar cgrewalcgrewal00000000000000Metadata-Version: 1.0 Name: dnsq Version: 1.1.2 Summary: DNS Query Tool Home-page: http://www.mailgun.com Author: Rackspace Author-email: admin@mailgunhq.com License: Apache 2 Description: dnsq ==== DNS Query Tool Usage ----- .. code-block:: py >>> import dnsq >>> dnsq.query_dns('www.example.com', 'a') ['93.184.216.119'] .. code-block:: py >>> import dnsq >>> dnsq.mx_hosts_for('example.com') ['example.com'] Platform: UNKNOWN dnsq-1.1.2/dnsq.egg-info/zip-safe0000664000175000017500000000000112305736666017661 0ustar cgrewalcgrewal00000000000000 dnsq-1.1.2/README.rst0000664000175000017500000000036612301266351015247 0ustar cgrewalcgrewal00000000000000dnsq ==== DNS Query Tool Usage ----- .. code-block:: py >>> import dnsq >>> dnsq.query_dns('www.example.com', 'a') ['93.184.216.119'] .. code-block:: py >>> import dnsq >>> dnsq.mx_hosts_for('example.com') ['example.com'] dnsq-1.1.2/PKG-INFO0000664000175000017500000000113612306436631014656 0ustar cgrewalcgrewal00000000000000Metadata-Version: 1.0 Name: dnsq Version: 1.1.2 Summary: DNS Query Tool Home-page: http://www.mailgun.com Author: Rackspace Author-email: admin@mailgunhq.com License: Apache 2 Description: dnsq ==== DNS Query Tool Usage ----- .. code-block:: py >>> import dnsq >>> dnsq.query_dns('www.example.com', 'a') ['93.184.216.119'] .. code-block:: py >>> import dnsq >>> dnsq.mx_hosts_for('example.com') ['example.com'] Platform: UNKNOWN dnsq-1.1.2/LICENSE/0000775000175000017500000000000012306436631014642 5ustar cgrewalcgrewal00000000000000dnsq-1.1.2/LICENSE/LICENSE_NOMINUM0000664000175000017500000000135512301266351017050 0ustar cgrewalcgrewal00000000000000Copyright (C) 2001-2003 Nominum, Inc. 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