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dig.py
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dig.py
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import re
import subprocess
def run_dig(domain, target_server=None, time=5, tries=1, stats=True, norecurse=False):
"""
Execute a dig command
:param domain: the domain to run a DNS query on
:param target_server: (optional) the recursive server to make the request to
:param time: the +time parameter to dig (timeout). Default: 5
:param tries: the +tries parameter to dig (number of retries after failure). Default: 1
:param stats: whether to display stats (+stats). Default: True
:param norecurse: whether to disable recursion (+norecurse). Default: False
:return: DigResults with parsed results if successful, None otherwise.
"""
args = ["dig"]
# Only include "@" field if target server is provided
if target_server is not None:
args.append("@{}".format(target_server))
args.append(domain)
args.append("+time={}".format(time))
args.append("+tries={}".format(tries))
if stats:
args.append("+stats")
if norecurse:
args.append("+norecurse")
# Run and decode
process = subprocess.Popen(args, stdout=subprocess.PIPE)
stdout, _ = process.communicate(None)
raw = stdout
output = raw.decode('utf-8')
try:
return DigResults.parse(output)
except AttributeError:
raise Exception('AttributeError', output)
class DigResults:
def __init__(self, answer, authority, additional, status, responding_server,
answer_section, authority_section, additional_section, query_time,
msg_size, recursion_not_available):
"""
:param answer: integer: number of answer section responses
:param authority: integer: number of authority section responses
:param additional: integer: number of additional section responses
:param status: the status field of the response. Usually 'NOERROR' or 'NXDOMAIN'
:param responding_server: the responding server's IP address
:param answer_section: an array of DigSectionLine objects corresponding to the number of responses
:param authority_section: an array of DigSectionLine objects corresponding to the number of responses
:param additional_section: an array of DigSectionLine objects corresponding to the number of responses
:param query_time: Query time field
:param msg_size: the MSG SIZE field
:param recursion_not_available: whether the phrase "recursion requested but not available" appeared
"""
self.recursion_not_available = recursion_not_available
self.msg_size = msg_size
self.query_time = query_time
self.ANSWER = answer
self.AUTHORITY = authority
self.ADDITIONAL = additional
self.status = status
self.responding_server = responding_server
self.additional_section = additional_section
self.authority_section = authority_section
self.answer_section = answer_section
@staticmethod
def parse(output):
"""
Parse dig output and return a DigResults object if possible
:param output: dig output
:return: DigResults or None
"""
lines = output.split("\n")
output = output.replace("\n", " ")
successful = ";; connection timed out" not in output
if len(output) == 0 or not successful: # Connection timed out, no point in continuing
return None
status = re.match(r'.*status: ([A-Z]+),.*', output).group(1)
authority_count = int(re.match(r'.*AUTHORITY: (\d+),.*', output).group(1))
answer_count = int(re.match(r'.*ANSWER: (\d+),.*', output).group(1))
additional_count = int(re.match(r'.*ADDITIONAL: (\d+).*', output).group(1))
responding_server = re.match(r'.*;; SERVER: (\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}).*', output).group(1)
query_time = int(re.match(r'.*Query time: (\d+) msec.*', output).group(1))
msg_size = int(re.match(r'.*MSG SIZE +rcvd: (\d+).*', output).group(1))
recursion_not_available = "recursion requested but not available" in output
authority_section = []
additional_section = []
answer_section = []
in_ans = False
in_auth = False
in_add = False
for line in lines:
# Update the section we're in
if "ANSWER SECTION" in line:
in_ans = True
in_auth = False
in_add = False
continue
if "AUTHORITY SECTION" in line:
in_ans = False
in_auth = True
in_add = False
continue
if "ADDITIONAL SECTION" in line:
in_ans = False
in_auth = False
in_add = True
continue
# Only attempt to parse a line if we're in an answer section
if in_ans or in_auth or in_add:
# Attempt to parse the line
line_parsed = DigSectionLine.parse(line)
# If successful, add the line result to the appropriate list
if line_parsed is not None:
if in_ans:
answer_section.append(line_parsed)
if in_auth:
authority_section.append(line_parsed)
if in_add:
additional_section.append(line_parsed)
return DigResults(status=status, answer=answer_count, authority=authority_count, additional=additional_count,
responding_server=responding_server, query_time=query_time, msg_size=msg_size,
authority_section=authority_section, answer_section=answer_section,
additional_section=additional_section, recursion_not_available=recursion_not_available)
def __str__(self):
return "status: {}, query time: {}, message size: {}, responding server: {}, " \
"ANSWER: {}, AUTHORITY: {}, ADDITIONAL: {}" \
"\n\tANSWER section: {}" \
"\n\tAUTHORITY section: {}" \
"\n\tADDITIONAL section: {}".format(self.status, self.query_time, self.msg_size, self.responding_server,
self.ANSWER, self.AUTHORITY, self.ADDITIONAL,
[str(l) for l in self.answer_section],
[str(l) for l in self.authority_section],
[str(l) for l in self.additional_section])
class DigSectionLine:
def __init__(self, name, ttl, response_class, record_type, ip):
self.ip = ip
self.record_type = record_type
self.response_class = response_class
self.ttl = ttl
self.name = name
@staticmethod
def parse(line):
result = re.search(r'^(\S+)\s+(\d+)\s+([A-Z]+)\s+([A-Z]+)\s+(.*)', line)
if result is not None:
return DigSectionLine(result.group(1),
int(result.group(2)),
result.group(3),
result.group(4),
result.group(5))
else:
return None
def __str__(self):
return "[name: {}, ttl: {}, class={}, type={}, ip={}]".format(self.name,
self.ttl,
self.response_class,
self.record_type,
self.ip)