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Merge pull request #10311 from jpmens/lookup-module-dig1
New lookup-plugin: `dig' for performing DNS lookups
This commit is contained in:
Brian Coca
commit
49fce3587b
1 changed files with 212 additions and 0 deletions
212
lib/ansible/runner/lookup_plugins/dig.py
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lib/ansible/runner/lookup_plugins/dig.py
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# (c) 2015, Jan-Piet Mens <jpmens(at)gmail.com>
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#
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# This file is part of Ansible
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#
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# Ansible is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# Ansible is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with Ansible. If not, see <http://www.gnu.org/licenses/>.
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from ansible import utils, errors
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import socket
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HAVE_DNS=False
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try:
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import dns.resolver
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import dns.reversename
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from dns.rdatatype import *
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from dns.exception import DNSException
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HAVE_DNS=True
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except ImportError:
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pass
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def make_rdata_dict(rdata):
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''' While the 'dig' lookup plugin supports anything which dnspython supports
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out of the box, the following supported_types list describes which
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DNS query types we can convert to a dict.
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Note: adding support for RRSIG is hard work. :)
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'''
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supported_types = {
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A : ['address'],
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AAAA : ['address'],
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CNAME : ['target'],
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DNAME : ['target'],
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DLV : ['algorithm', 'digest_type', 'key_tag', 'digest'],
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DNSKEY : ['flags', 'algorithm', 'protocol', 'key'],
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DS : ['algorithm', 'digest_type', 'key_tag', 'digest'],
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HINFO : ['cpu', 'os'],
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LOC : ['latitude', 'longitude', 'altitude', 'size', 'horizontal_precision', 'vertical_precision'],
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MX : ['preference', 'exchange'],
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NAPTR : ['order', 'preference', 'flags', 'service', 'regexp', 'replacement'],
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NS : ['target'],
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NSEC3PARAM : ['algorithm', 'flags', 'iterations', 'salt'],
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PTR : ['target'],
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RP : ['mbox', 'txt'],
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# RRSIG : ['algorithm', 'labels', 'original_ttl', 'expiration', 'inception', 'signature'],
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SOA : ['mname', 'rname', 'serial', 'refresh', 'retry', 'expire', 'minimum'],
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SPF : ['strings'],
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SRV : ['priority', 'weight', 'port', 'target'],
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SSHFP : ['algorithm', 'fp_type', 'fingerprint'],
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TLSA : ['usage', 'selector', 'mtype', 'cert'],
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TXT : ['strings'],
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}
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rd = {}
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if rdata.rdtype in supported_types:
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fields = supported_types[rdata.rdtype]
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for f in fields:
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val = rdata.__getattribute__(f)
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if type(val) == dns.name.Name:
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val = dns.name.Name.to_text(val)
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if rdata.rdtype == DLV and f == 'digest':
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val = dns.rdata._hexify(rdata.digest).replace(' ', '')
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if rdata.rdtype == DS and f == 'digest':
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val = dns.rdata._hexify(rdata.digest).replace(' ', '')
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if rdata.rdtype == DNSKEY and f == 'key':
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val = dns.rdata._base64ify(rdata.key).replace(' ', '')
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if rdata.rdtype == NSEC3PARAM and f == 'salt':
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val = dns.rdata._hexify(rdata.salt).replace(' ', '')
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if rdata.rdtype == SSHFP and f == 'fingerprint':
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val = dns.rdata._hexify(rdata.fingerprint).replace(' ', '')
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if rdata.rdtype == TLSA and f == 'cert':
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val = dns.rdata._hexify(rdata.cert).replace(' ', '')
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rd[f] = val
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return rd
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# ==============================================================
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# dig: Lookup DNS records
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#
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# --------------------------------------------------------------
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class LookupModule(object):
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def __init__(self, basedir=None, **kwargs):
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self.basedir = basedir
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if HAVE_DNS == False:
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raise errors.AnsibleError("Can't LOOKUP(dig): module dns.resolver is not installed")
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def run(self, terms, inject=None, **kwargs):
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'''
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terms contains a string with things to `dig' for. We support the
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following formats:
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example.com # A record
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example.com qtype=A # same
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example.com/TXT # specific qtype
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example.com qtype=txt # same
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192.168.1.2/PTR # reverse PTR
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^^ shortcut for 2.1.168.192.in-addr.arpa/PTR
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example.net/AAAA @nameserver # query specified server
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^^^ can be comma-sep list of names/addresses
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... flat=0 # returns a dict; default is 1 == string
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'''
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terms = terms.split()
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# Create Resolver object so that we can set NS if necessary
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myres = dns.resolver.Resolver()
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edns_size = 4096
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myres.use_edns(0, ednsflags=dns.flags.DO, payload=edns_size)
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domain = None
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qtype = 'A'
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flat = True
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for t in terms:
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if t.startswith('@'): # e.g. "@10.0.1.2,192.168.1.1" is ok.
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nsset = t[1:].split(',')
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nameservers = []
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for ns in nsset:
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# Check if we have a valid IP address. If so, use that, otherwise
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# try to resolve name to address using system's resolver. If that
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# fails we bail out.
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try:
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socket.inet_aton(ns)
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nameservers.append(ns)
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except:
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try:
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nsaddr = dns.resolver.query(ns)[0].address
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nameservers.append(nsaddr)
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except Exception, e:
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raise errors.AnsibleError("dns lookup NS: ", str(e))
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myres.nameservers = nameservers
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continue
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if '=' in t:
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try:
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opt, arg = t.split('=')
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except:
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pass
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if opt == 'qtype':
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qtype = arg.upper()
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elif opt == 'flat':
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flat = int(arg)
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continue
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if '/' in t:
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try:
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domain, qtype = t.split('/')
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except:
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domain = t
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else:
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domain = t
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# print "--- domain = {0} qtype={1}".format(domain, qtype)
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ret = []
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if qtype.upper() == 'PTR':
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try:
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n = dns.reversename.from_address(domain)
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domain = n.to_text()
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except dns.exception.SyntaxError:
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pass
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except Exception, e:
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raise errors.AnsibleError("dns.reversename unhandled exception", str(e))
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try:
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answers = myres.query(domain, qtype)
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for rdata in answers:
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s = rdata.to_text()
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if qtype.upper() == 'TXT':
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s = s[1:-1] # Strip outside quotes on TXT rdata
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if flat:
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ret.append(s)
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else:
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try:
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rd = make_rdata_dict(rdata)
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rd['owner'] = answers.canonical_name.to_text()
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rd['type'] = dns.rdatatype.to_text(rdata.rdtype)
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rd['ttl'] = answers.rrset.ttl
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ret.append(rd)
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except Exception, e:
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ret.append(str(e))
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except dns.resolver.NXDOMAIN:
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ret.append('NXDOMAIN')
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except dns.resolver.NoAnswer:
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ret.append("")
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except dns.resolver.Timeout:
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ret.append('')
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except dns.exception.DNSException, e:
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raise errors.AnsibleError("dns.resolver unhandled exception", e)
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return ret
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