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# (c) 2015, Jan-Piet Mens <jpmens(at)gmail.com>
#
# This file is part of Ansible
#
# Ansible is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Ansible is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Ansible. If not, see <http://www.gnu.org/licenses/>.
from __future__ import (absolute_import, division, print_function)
__metaclass__ = type
from ansible.errors import AnsibleError
from ansible.plugins.lookup import LookupBase
from ansible.module_utils._text import to_native
import socket
try:
import dns.exception
import dns.name
import dns.resolver
import dns.reversename
import dns.rdataclass
from dns.rdatatype import (A, AAAA, CNAME, DLV, DNAME, DNSKEY, DS, HINFO, LOC,
MX, NAPTR, NS, NSEC3PARAM, PTR, RP, SOA, SPF, SRV, SSHFP, TLSA, TXT)
HAVE_DNS = True
except ImportError:
HAVE_DNS = False
def make_rdata_dict(rdata):
''' While the 'dig' lookup plugin supports anything which dnspython supports
out of the box, the following supported_types list describes which
DNS query types we can convert to a dict.
Note: adding support for RRSIG is hard work. :)
'''
supported_types = {
A : ['address'],
AAAA : ['address'],
CNAME : ['target'],
DNAME : ['target'],
DLV : ['algorithm', 'digest_type', 'key_tag', 'digest'],
DNSKEY : ['flags', 'algorithm', 'protocol', 'key'],
DS : ['algorithm', 'digest_type', 'key_tag', 'digest'],
HINFO : ['cpu', 'os'],
LOC : ['latitude', 'longitude', 'altitude', 'size', 'horizontal_precision', 'vertical_precision'],
MX : ['preference', 'exchange'],
NAPTR : ['order', 'preference', 'flags', 'service', 'regexp', 'replacement'],
NS : ['target'],
NSEC3PARAM : ['algorithm', 'flags', 'iterations', 'salt'],
PTR : ['target'],
RP : ['mbox', 'txt'],
# RRSIG : ['algorithm', 'labels', 'original_ttl', 'expiration', 'inception', 'signature'],
SOA : ['mname', 'rname', 'serial', 'refresh', 'retry', 'expire', 'minimum'],
SPF : ['strings'],
SRV : ['priority', 'weight', 'port', 'target'],
SSHFP : ['algorithm', 'fp_type', 'fingerprint'],
TLSA : ['usage', 'selector', 'mtype', 'cert'],
TXT : ['strings'],
}
rd = {}
if rdata.rdtype in supported_types:
fields = supported_types[rdata.rdtype]
for f in fields:
val = rdata.__getattribute__(f)
if isinstance(val, dns.name.Name):
val = dns.name.Name.to_text(val)
if rdata.rdtype == DLV and f == 'digest':
val = dns.rdata._hexify(rdata.digest).replace(' ', '')
if rdata.rdtype == DS and f == 'digest':
val = dns.rdata._hexify(rdata.digest).replace(' ', '')
if rdata.rdtype == DNSKEY and f == 'key':
val = dns.rdata._base64ify(rdata.key).replace(' ', '')
if rdata.rdtype == NSEC3PARAM and f == 'salt':
val = dns.rdata._hexify(rdata.salt).replace(' ', '')
if rdata.rdtype == SSHFP and f == 'fingerprint':
val = dns.rdata._hexify(rdata.fingerprint).replace(' ', '')
if rdata.rdtype == TLSA and f == 'cert':
val = dns.rdata._hexify(rdata.cert).replace(' ', '')
rd[f] = val
return rd
# ==============================================================
# dig: Lookup DNS records
#
# --------------------------------------------------------------
class LookupModule(LookupBase):
def run(self, terms, variables=None, **kwargs):
'''
terms contains a string with things to `dig' for. We support the
following formats:
example.com # A record
example.com qtype=A # same
example.com/TXT # specific qtype
example.com qtype=txt # same
192.0.2.23/PTR # reverse PTR
^^ shortcut for 23.2.0.192.in-addr.arpa/PTR
example.net/AAAA @nameserver # query specified server
^^^ can be comma-sep list of names/addresses
... flat=0 # returns a dict; default is 1 == string
'''
if HAVE_DNS is False:
raise AnsibleError("Can't LOOKUP(dig): module dns.resolver is not installed")
# Create Resolver object so that we can set NS if necessary
myres = dns.resolver.Resolver(configure=True)
edns_size = 4096
myres.use_edns(0, ednsflags=dns.flags.DO, payload=edns_size)
domain = None
qtype = 'A'
flat = True
rdclass = dns.rdataclass.from_text('IN')
for t in terms:
if t.startswith('@'): # e.g. "@10.0.1.2,192.0.2.1" is ok.
nsset = t[1:].split(',')
for ns in nsset:
nameservers = []
# Check if we have a valid IP address. If so, use that, otherwise
# try to resolve name to address using system's resolver. If that
# fails we bail out.
try:
socket.inet_aton(ns)
nameservers.append(ns)
except:
try:
nsaddr = dns.resolver.query(ns)[0].address
nameservers.append(nsaddr)
except Exception as e:
raise AnsibleError("dns lookup NS: %s" % to_native(e))
myres.nameservers = nameservers
continue
if '=' in t:
try:
opt, arg = t.split('=')
except:
pass
if opt == 'qtype':
qtype = arg.upper()
elif opt == 'flat':
flat = int(arg)
elif opt == 'class':
try:
rdclass = dns.rdataclass.from_text(arg)
except Exception as e:
raise AnsibleError("dns lookup illegal CLASS: %s" % to_native(e))
continue
if '/' in t:
try:
domain, qtype = t.split('/')
except:
domain = t
else:
domain = t
# print "--- domain = {0} qtype={1} rdclass={2}".format(domain, qtype, rdclass)
ret = []
if qtype.upper() == 'PTR':
try:
n = dns.reversename.from_address(domain)
domain = n.to_text()
except dns.exception.SyntaxError:
pass
except Exception as e:
raise AnsibleError("dns.reversename unhandled exception %s" % to_native(e))
try:
answers = myres.query(domain, qtype, rdclass=rdclass)
for rdata in answers:
s = rdata.to_text()
if qtype.upper() == 'TXT':
s = s[1:-1] # Strip outside quotes on TXT rdata
if flat:
ret.append(s)
else:
try:
rd = make_rdata_dict(rdata)
rd['owner'] = answers.canonical_name.to_text()
rd['type'] = dns.rdatatype.to_text(rdata.rdtype)
rd['ttl'] = answers.rrset.ttl
rd['class'] = dns.rdataclass.to_text(rdata.rdclass)
ret.append(rd)
except Exception as e:
ret.append(str(e))
except dns.resolver.NXDOMAIN:
ret.append('NXDOMAIN')
except dns.resolver.NoAnswer:
ret.append("")
except dns.resolver.Timeout:
ret.append('')
except dns.exception.DNSException as e:
raise AnsibleError("dns.resolver unhandled exception %s" % to_native(e))
return ret
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