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community.general/lib/ansible/plugins/lookup/dig.py
Brian Coca 43cbcbcc75 removed typo from dig docs
2017-09-29 11:23:58 -04:00

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# (c) 2015, Jan-Piet Mens <jpmens(at)gmail.com>
# (c) 2017 Ansible Project
# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
from __future__ import (absolute_import, division, print_function)
__metaclass__ = type
DOCUMENTATION = """
lookup: dig
author: Jan-Piet Mens (@jpmens) <jpmens(at)gmail.com>
version_added: "1.9"
short_description: query DNS using the dnspython library
requirements:
- dnspython (python library, http://www.dnspython.org/)
description:
- The dig lookup runs queries against DNS servers to retrieve DNS records for a specific name (FQDN - fully qualified domain name).
It is possible to lookup any DNS record in this manner.
- There is a couple of different syntaxes that can be used to specify what record should be retrieved, and for which name.
It is also possible to explicitly specify the DNS server(s) to use for lookups.
- In its simplest form, the dig lookup plugin can be used to retrieve an IPv4 address (DNS A record) associated with FQDN
- In addition to (default) A record, it is also possible to specify a different record type that should be queried.
This can be done by either passing-in additional parameter of format qtype=TYPE to the dig lookup, or by appending /TYPE to the FQDN being queried.
- If multiple values are associated with the requested record, the results will be returned as a comma-separated list.
In such cases you may want to pass option wantlist=True to the plugin, which will result in the record values being returned as a list
over which you can iterate later on.
- By default, the lookup will rely on system-wide configured DNS servers for performing the query.
It is also possible to explicitly specify DNS servers to query using the @DNS_SERVER_1,DNS_SERVER_2,...,DNS_SERVER_N notation.
This needs to be passed-in as an additional parameter to the lookup
options:
_terms:
description: domain(s) to query
qtype:
description: record type to query
default: 'A'
choices: [A, ALL, AAAA, CNAME, DNAME, DLV, DNSKEY, DS, HINFO, LOC, MX, NAPTR, NS, NSEC3PARAM, PTR, RP, RRSIG, SOA, SPF, SRV, SSHFP, TLSA, TXT]
flat:
description: If 0 each record is returned as a dictionary, otherwise a string
default: 1
notes:
- ALL is not a record per-se, merely the listed fields are available for any record results you retrieve in the form of a dictionary.
- While the 'dig' lookup plugin supports anything which dnspython supports out of the box, only a subset can be converted into a dictionary.
- If you need to obtain the AAAA record (IPv6 address), you must specify the record type explicitly.
Syntax for specifying the record type is shown in the examples below.
- The trailing dot in most of the examples listed is purely optional, but is specified for completeness/correctness sake.
"""
EXAMPLES = """
- name: Simple A record (IPV4 address) lookup for example.com
debug: msg="{{ lookup('dig', 'example.com.')}}"
- name: "The TXT record for example.org."
debug: msg="{{ lookup('dig', 'example.org.', 'qtype=TXT') }}"
- name: "The TXT record for example.org, alternative syntax."
debug: msg="{{ lookup('dig', 'example.org./TXT') }}"
- name: use in a loop
debug: msg="MX record for gmail.com {{ item }}"
with_items: "{{ lookup('dig', 'gmail.com./MX', wantlist=True) }}"
- debug: msg="Reverse DNS for 192.0.2.5 is {{ lookup('dig', '192.0.2.5/PTR') }}"
- debug: msg="Reverse DNS for 192.0.2.5 is {{ lookup('dig', '5.2.0.192.in-addr.arpa./PTR') }}"
- debug: msg="Reverse DNS for 192.0.2.5 is {{ lookup('dig', '5.2.0.192.in-addr.arpa.', 'qtype=PTR') }}"
- debug: msg="Querying 198.51.100.23 for IPv4 address for example.com. produces {{ lookup('dig', 'example.com', '@198.51.100.23') }}"
- debug: msg="XMPP service for gmail.com. is available at {{ item.target }} on port {{ item.port }}"
with_items: "{{ lookup('dig', '_xmpp-server._tcp.gmail.com./SRV', 'flat=0', wantlist=True) }}"
"""
RETURN = """
_list:
description:
- list of composed strings or dictonaries with key and value
If a dictionary, fields shows the keys returned depending on query type
fields:
ALL: owner, ttl, type
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
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
"""
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("The dig lookup requires the python 'dnspython' library and it 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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