class Runner(FuzzObject):
"""
This is the main runner class of the Fuzzer Framework.
It integrates the kitty/katnip components and the framework components.
See documentation for the usage.
"""
def __init__(self, name='Runner', logger=None):
super(Runner, self).__init__(name, logger)
self.config = ConfigParser()
self.framework_utils = FrameworkUtils()
self.put_archive_to_s3 = PutArchiveToS3()
self.proto_path = self.config.get_generic_proto_path()
self.pb2_path = self.config.get_generic_pb2_path()
self.verbosity = self.config.get_generic_verbosity()
self.module_path = self.config.get_module_path()
self.proto_modules = self.config.get_protobuf_modules()
self.proto_classes = self.config.get_protobuf_classes_to_send()
self.protocol_proto = self.config.get_protocol_protobuf()
self.protocol_http = self.config.get_protocol_http()
self.protocol_dns = self.config.get_protocol_dns()
self.set_verbosity(self.verbosity)
self.use_s3_to_archive = self.config.get_archive_to_s3()
def search_files(self) -> tuple:
"""
Creates lists of raw and compiled proto files paired into tuple;
:return: raw and compiled proto file lists in tuple;
"""
search_raw_proto = SearchFile(file_type='.proto', file_path=self.proto_path)
raw_proto_files = search_raw_proto.search_file
self.logger.debug(f'RAW proto files {raw_proto_files}')
search_api = SearchFile(file_type='_pb2.py', file_path=self.pb2_path)
compiled_proto_files = search_api.search_file
self.logger.debug(f'Compiled proto files {compiled_proto_files}')
return raw_proto_files, compiled_proto_files
def checksum_files(self, raw_proto: list) -> list:
# TODO for further usage, function not in use.
checksum_files = self.framework_utils.md5_checksum_for_proto_files(raw_proto)
self.logger.debug(f'Checksum {checksum_files}')
return checksum_files
@property
def process_pb2(self) -> object:
"""
This function parses the compiled protobuf API and
produces a Dictionary representation of it.
:return: object
"""
compiled_proto_files = self.search_files()[1]
for item in compiled_proto_files:
if len(item.split('_')) > 2:
raise FileNameError # raise if file name contains more then 2 underline.
elif item.split('_')[0] in self.config.get_protobuf_modules():
parse_file = ParseProtoApi(pb2_api_file=item,
module_path=self.module_path)
return parse_file.execute_api_parse()
else:
self.logger.info(f'File {item} was not part of the inspection.')
def tear_down(self):
"""
The common tear down sequence of a fuzzing session
:return: None
"""
self.framework_utils.results_dir()
self.framework_utils.rename_log_file()
self.framework_utils.archive_locally()
self.report()
self.framework_utils.archive_xml()
if self.use_s3_to_archive:
self.put_archive_to_s3.do_upload(self.framework_utils.dir_files_to_archive())
def report(self):
_report = CreateReport()
_report.run_report()
def run(self):
if self.config.get_banner():
file1 = open(os.getcwd() + '/banner', 'r')
Lines = file1.readlines()
for line in Lines:
print(f' {line.strip()}')
for i in range(5, 0, -1):
sys.stdout.write(str(i) + '.....')
sys.stdout.flush()
time.sleep(1)
if self.protocol_proto:
self.logger.info(f"[{time.strftime('%H:%M:%S')}] Starting PROTOBUF Fuzzer session")
try:
api = self.process_pb2
do_proto = ProtobufRunner(pb2_api=api)
do_proto.run_proto()
except SystemError as e:
self.logger.error(f"Interpreter found an internal error: {e}")
except EnvironmentError as e:
self.logger(f"Error occur outside the Python environment: {e}")
finally:
self.logger.info(f"[{time.strftime('%H:%M:%S')}] Flush cache...")
self.logger.info(f"[{time.strftime('%H:%M:%S')}] Rename kitty related log files...")
self.tear_down()
elif self.protocol_dns:
self.logger.info(f"[{time.strftime('%H:%M:%S')}] Starting DNS Fuzzer session")
try:
# query record type
do_dns = DnsRunner()
do_dns.run_dns()
self.logger.info(f"[{time.strftime('%H:%M:%S')}] DNS runner started")
except SystemError as e:
self.logger.error(f"Interpreter finds an internal problem {e}")
except EnvironmentError as e:
self.logger(f"Error occur outside the Python environment: {e}")
finally:
self.logger.info(f"[{time.strftime('%H:%M:%S')}] Rename kitty related log files...")
self.tear_down()
elif self.protocol_http:
self.logger.info(f"[{time.strftime('%H:%M:%S')}] Starting HTTP Fuzzer session")
try:
do_http = HttpRunner()
do_http.run_http()
self.logger.info(f"[{time.strftime('%H:%M:%S')}] HTTP runner started")
except SystemError as e:
self.logger.error(f"Interpreter finds an internal problem {e}")
except EnvironmentError as e:
self.logger(f"Error occur outside the Python environment: {e}")
finally:
self.logger.info(f"[{time.strftime('%H:%M:%S')}] Rename kitty related log files...")
self.tear_down()
class ProtobufTarget(ServerTarget):
"""
ProtobufTarget will create files with the fuzzed payloads
"""
def __init__(self,
name=str,
host=str,
port=int,
max_retries=10,
timeout=None,
logger=None,
pb2_module=None) -> None:
"""
Class creates the protobuf payload with the marriage of Fuzzed data.
:param name: name of the class
:param host: target host
:param port: target port
:param max_retries: maximum retries of connection
:param timeout: timeout
:param logger: kitty logger
"""
super(ProtobufTarget, self).__init__(name, logger)
self.host = host
self.port = port
if (host is None) or (port is None):
raise ValueError('Host and port may not be None')
self.timeout = timeout
self.socket = None
self.max_retries = max_retries
self.pb2_module = pb2_module
self.set_expect_response(False)
self.config = ConfigParser()
self.verbosity = self.config.get_generic_verbosity()
self.logger.setLevel(self.verbosity)
self.module_path = self.config.get_module_path()
self._uuid = GenerateUUID.generate_uuid()
self.frmwrk_utils = FrameworkUtils()
def pre_test(self, test_num=int) -> None:
"""
This is only checks whether the target is available or not.
:param test_num: The number of the test case.
"""
super(ProtobufTarget, self).pre_test(test_num)
retry_count = 0
while self.socket is None and retry_count < self.max_retries:
sock = self._get_socket()
if self.timeout is not None:
sock.settimeout(self.timeout)
try:
retry_count += 1
sock.connect((self.host, self.port))
self.socket = sock
except Exception:
sock.close()
self.logger.error(
f"PBTARGET - TCP Error: {traceback.format_exc()}")
self.logger.error(
f"PBTARGET - TCP Failed to connect to target server, retrying..."
)
time.sleep(1)
if self.socket is None:
raise (KittyException(
'PBTARGET - TCPTarget: (pre_test) cannot connect to server (retries = %d'
% retry_count))
def _get_socket(self) -> socket:
"""
Get a socket object
"""
return socket.socket(socket.AF_INET, socket.SOCK_STREAM)
def post_test(self, test_num=int):
"""
Called after a test is completed, perform cleanup etc.
"""
super(ProtobufTarget, self).post_test(test_num)
if self.socket is not None:
self.socket.close()
self.socket = None
if self.report.get('status') != Report.PASSED:
if not os.path.exists(os.getcwd() + '/results/'):
os.makedirs(os.getcwd() + '/results/')
test_num = self.report.get('test_number')
with open(os.getcwd() +
'/results/{}-result-protobuf-{}.json'.format(
test_num, str(self._uuid)),
'w',
encoding='utf-8') as file:
json.dump(self.report.to_dict(),
file,
ensure_ascii=False,
indent=4)
def _construct_message(self, data, pb2_module):
msg = None
to_dict = json.loads(data.decode())
counter = 0
for key, val in to_dict.items():
if counter == 0:
module_to_put_into = getattr(pb2_module, key)
msg = json_format.ParseDict(val, module_to_put_into())
else:
# TODO Should implement a mechanism to send together
# TODO top level messages.
# TODO Currently sending only one top level for.ie.: Request
# TODO and all its nested messages.
raise NotImplementedError
counter += 1
return msg
def _send_to_target(self, data):
"""
HTTP POST with protobuf binary payload:
POST / HTTP/1.1
Host: localhost:8000
Content-Type: : 'application/octet-stream'
"b'|\x00\x00\x00\n\x05fdbcd\x10{\x1a\x05fdbcd"\t\n\x05fdbcd\x10\x01:_\n\x05fdbcd\x10{\x18\x01""\n\x05fdbcd\x10{\x1a\x05fdbcd"\x10\n\x05fdbcd\x10{\x1a\x05fdbcd*\x10\n\x05fdbcd\x10{\x1a\x05fdbcd2\x10\n\x05fdbcd\x10{\x1a\x05fdbcdB\n\n\x06%u0000\x10{'"
https://stackoverflow.com/questions/28670835/python-socket-client-post-parameters
:param data:
:return:
"""
proto_payload = self._construct_message(data, self.pb2_module)
host = None
port = None
headers = """\
POST / HTTP/1.1\r
\r\n\
Content-Type: {content_type}\r
Content-Length: {content_length}\r
\r\n"""
body_bytes = self.frmwrk_utils.encode_message(proto_payload)
# Evaluation of the message.
#self.frmwrk_utils.decode_message(body_bytes, lookup_pb2, 'Request')
header_bytes = headers.format(content_type="application/octet-stream",
content_length=len(body_bytes),
host=str(host) + ":" +
str(port)).encode('iso-8859-1')
payload = header_bytes + body_bytes
self.socket.send(payload)
def _receive_from_target(self):
return self.socket.recv(10000)
def transmit(self, payload):
"""
This is the original transmit method from ServerTarget overwritten with
special cases such as 40X or 50X according to the aim of the test.
Accordin to https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/500
500 Internal Server Error
501 Not Implemented
502 Bad Gateway
503 Service Unavailable
504 Gateway Timeout
505 HTTP Version Not Supported
506 Variant Also Negotiates
507 Insufficient Storage
508 Loop Detected
510 Not Extended
511 Network Authentication Required
Original method docstring:
Transmit single payload, and receive response, if expected.
The actual implementation of the send/receive should be in
``_send_to_target`` and ``_receive_from_target``.
:type payload: str
:param payload: payload to send
:rtype: str
:return: the response (if received)
"""
SERVER_50x_CODES = [
'500 Internal Server Error', '501 Not Implemented',
'502 Bad Gateway', '503 Service Unavailable',
'504 Gateway Timeout', '505 HTTP Version Not Supported',
'506 Variant Also Negotiates', '507 Insufficient Storage',
'508 Loop Detected', '510 Not Extended',
'511 Network Authentication Required'
]
SERVER_40xCODES = [
'400 Bad Request', '401 Unauthorized', '402 Payment Required',
'403 Forbidden', '404 Not Found', '405 Method Not Allowed',
'406 Not Acceptable', '407 Proxy Authentication Required',
'408 Request Timeout', '409 Conflict', '410 Gone',
'411 Length Required', '412 Precondition Failed',
'413 Payload Too Large', '414 URI Too Long',
'415 Unsupported Media Type', '416 Range Not Satisfiable',
'417 Expectation Failed', '422 Unprocessable Entity',
'425 Too Early', '426 Upgrade Required',
'428 Precondition Required', '429 Too Many Requests',
'431 Request Header Fields Too Large',
'451 Unavailable For Legal Reasons'
]
response = None
trans_report_name = 'transmission_0x%04x' % self.transmission_count
trans_report = Report(trans_report_name)
self.transmission_report = trans_report
self.report.add(trans_report_name, trans_report)
try:
trans_report.add('request (hex)', hexlify(payload).decode())
trans_report.add('request (raw)', '%s' % payload)
trans_report.add('request length', len(payload))
trans_report.add('request time', time.time())
request = hexlify(payload).decode()
request = request if len(request) < 100 else (request[:100] +
' ...')
self.logger.info(f"request({len(payload)}): {request}")
self.logger.debug(f"payload {payload}")
self._send_to_target(payload)
trans_report.success()
if self.expect_response:
try:
response = self._receive_from_target()
trans_report.add('response time', time.time())
trans_report.add('response (hex)',
hexlify(response).decode())
trans_report.add('response (raw)', '%s' % response)
trans_report.add('response length', len(response))
trans_report.add('Session ID', str(self._uuid))
printed_response = hexlify(response).decode()
printed_response = printed_response if len(
printed_response) < 100 else (printed_response[:100] +
' ...')
self.logger.info(
f"response({len(response)}): {printed_response}")
string_response = response.decode('utf-8')
response_code_string = string_response.splitlines()[0]
response_code = response_code_string.replace(
'HTTP/1.1 ', '')
if response_code in SERVER_40xCODES or response_code in SERVER_50x_CODES:
self.logger.info(
f"response failure {response.decode('utf-8')}")
trans_report.failed('Failure in HTTP-PROTO response.')
trans_report.add('Response', response.decode('utf-8'))
self.report.set_status('failed')
self.receive_failure = True
except Exception as ex2:
trans_report.failed('failed to receive response: %s' % ex2)
trans_report.add('traceback', traceback.format_exc())
self.logger.error(
f"target.transmit - failure in receive (exception: {ex2})"
)
self.logger.error(traceback.format_exc())
self.receive_failure = True
else:
response = ''
except Exception as ex1:
#trans_report.failed('failed to send payload: %s' % ex1)
#trans_report.add('traceback', traceback.format_exc())
self.logger.error(
f"target.transmit - failure in send (exception: {ex1})")
self.logger.error(traceback.format_exc())
#self.send_failure = True
self.transmission_count += 1
return response
class DnsTarget(ServerTarget):
"""
DnsTarget is implementation of a DNS target, which is inherited from ServerTarget and
uses socket DGRAM to send DNS query over UDP.
"""
def __init__(self, name, host, port, timeout=None, logger=None):
"""
:param name: name of the target
:param host: host ip (to send data to) currently unused
:param port: port to send to
:param timeout: socket timeout (default: None)
:param logger: logger for the object (default: None)
"""
super(DnsTarget, self).__init__(name, logger)
self.host = host
self.port = port
if (host is None) or (port is None):
raise ValueError('Host and port may not be None!')
self.timeout = timeout
self.socket = None
self.bind_host = None
self.bind_port = None
self.expect_response = False
self.config = ConfigParser()
self.dns_a_record_status = self.config.get_dns_a_record_status()
self.dns_ns_record_status = self.config.get_dns_ns_record_status()
self.dns_txt_record_status = self.config.get_dns_txt_record_status()
self.verbosity = self.config.get_generic_verbosity()
self.logger.setLevel(self.verbosity)
self._uuid = GenerateUUID.generate_uuid()
self.question_length = None
def set_binding(self, host=str, port=int, expect_response=False) -> None:
"""
Enable binding of socket to given ip/address
Katnip original method.
"""
self.bind_host = host
self.bind_port = port
self.expect_response = expect_response
self._do_bind()
def _do_bind(self) -> None:
"""Katnip original method."""
self.socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
self.socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
self.socket.setsockopt(socket.SOL_SOCKET, socket.SO_BROADCAST, 1)
self.socket.bind((self.bind_host, self.bind_port))
def _prepare_socket(self) -> None:
"""Katnip original method."""
if self.bind_host is None:
self.socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
else:
self._do_bind()
def pre_test(self, test_num=str) -> None:
"""Katnip original method."""
super(DnsTarget, self).pre_test(test_num)
if self.socket is None:
self._prepare_socket()
if self.timeout is not None:
self.socket.settimeout(self.timeout)
def post_test(self, test_num=str) -> None:
"""
Katnip original method.
Extended with report export.
"""
super(DnsTarget, self).post_test(test_num)
if self.socket is not None:
self.socket.close()
self.socket = None
if self.report.get('status') != Report.PASSED:
if not os.path.exists(os.getcwd() + '/results/'):
os.makedirs(os.getcwd() + '/results/')
test_num = self.report.get('test_number')
with open(os.getcwd() + '/results/{}-result-dns-{}.json'.format(test_num, str(self._uuid)), 'w',
encoding='utf-8') as file:
json.dump(self.report.to_dict(), file, ensure_ascii=False, indent=4)
file.close()
def _construct_dns_query(self, data=bytes) -> bytes:
"""
According to https://routley.io/posts/hand-writing-dns-messages/ and based on
https://github.com/tigerlyb/DNS-Lookup-Tool-in-Python/blob/master/dnslookup.py
:param data: the fuzzed data, in this case the DNS query foo.baz.bar.TLD
:type data: bytes
:return: the processed DNS query we will have been putting on wire.
:rtype: bytes
"""
global qtype
domain = None
try:
domain = data.decode('utf-8')
except:
"""UnicodeDecodeError: 'utf-8' codec can't decode byte 0xfe in position 1: invalid start byte"""
self.logger.error(f"UnicodeDecodeError: {data.decode('iso-8859-1')}")
domain = data.decode('iso-8859-1')
qname = b''
for label in domain.split('.'):
# QNAME a domain name represented as a sequence of labels which consists
# the length octet followed by the number of octets.
# example.com consists two sections example and com
# to construct the URL encode the section and producing series of bytes using struct in this case.
# Section terminator is zero byte (00)
qname = qname + struct.pack(b'!b' +
str(len(label)).encode('utf-8') +
b's', len(label),
label.encode('utf-8'))
"""
Header:
0 1 2 3 4 5 6 7 8 9 A B C D E F
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
| ID | header_layer_1
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
|QR| Opcode |AA|TC|RD|RA| Z | RCODE | header_layer_2
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
| QDCOUNT | header_layer_3
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
| ANCOUNT | header_layer_4
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
| NSCOUNT | header_layer_5
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
| ARCOUNT | header_layer_6
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
"""
header_layer_1 = b'\x41\x41' # ID AA this is an ID assigned by the program that generates the query
header_layer_2 = b'\x01\x00' # QR Query parameters, QR: 1 bit flag query or response, we set this flag to 0.
# Opcode A 4 bit field
# 0: inverse query,
# 1: standard query,
# 2: server status request
# 3: reserved for further usage
# TC: 1 bit flag to truncat message
# RD: 1 bit flag if recursion is desired
# QDCOUNT: 16 bit integer to specifying the number of entries in the question section.
# 01 00 hexadecimal is 0000 0001 0000 0000 from QR to RCODE represents a standard
# DNS query. Fields are not mentioned sets to 0.
header_layer_3 = b'\x00\x01' # Number of questions, we ask one question per query
header_layer_4 = b'\x00\x00' # Number of answers
header_layer_5 = b'\x00\x00' # Number of authority records
header_layer_6 = b'\x00\x00' # Number of additional records
header = header_layer_1 + header_layer_2 + header_layer_3 + header_layer_4 + header_layer_5 + header_layer_6
# print(header)
# print(type(header))
"""
0 1 2 3 4 5 6 7 8 9 A B C D E F
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
| |
/ QNAME /
/ /
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
| QTYPE |
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
| QCLASS |
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
"""
# QNAME holds by domain_labels variable, explained above.
# QTYPE the DNS record type we looking for
# QTYPE A: 1 NS: 2 TXT: 16
# QCLASS the class we are looking up, we using IN which has a value of 1, internet.
# here again terminate x00\x00 is the zero byte terminator.
terminate = b'\x00\x00'
if self.dns_a_record_status:
qtype = b'\x01\x00' # 1 ask A record
elif self.dns_ns_record_status:
qtype = b'\x02\x00' # 2 ask NS
elif self.dns_txt_record_status:
qtype = b'\x10\x00' # 16 ask TXT record
qclass = b'\x01'
question = qname + terminate + qtype + qclass
message = header + question
self.question_length = len(question)
# USE DNS LIB TO HELP DEBUGGING MALFORMED HEADER
# debug_question_header = DNSBuffer(binascii.unhexlify(header))
# print('Debugg header: ', DNSHeader.parse(debug_question_header))
return message
def _send_to_target(self, data):
message = self._construct_dns_query(data)
self.logger.debug(f"Sending data to host: {self.host}, {self.port}")
try:
self.logger.info(f"Sending data {data.decode('utf-8')}")
except:
self.logger.info(f"Sending data {data.decode('iso-8859-1')}")
self.socket.sendto(message, (self.host, self.port))
def _receive_from_target(self) -> bytes:
"""
This function is in charge to process the DNS reply back on the road.
According to the response:
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
| |
/ /
/ NAME /
| |
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
| TYPE |
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
| CLASS |
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
| TTL |
| |
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
| RDLENGTH |
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
/ RDATA /
/ /
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
:return: the response in bytes
:rtype: bytes
"""
response, addr = self.socket.recvfrom(1024)
return response
def transmit(self, payload):
"""
This is the original transmit method from ServerTarget overwritten with
DNS response code specific reporting
Accordin to:
https://support.umbrella.com/hc/en-us/articles/232254248-Common-DNS-return-codes-for-any-DNS-service-and-Umbrella-
NOERROR RCODE:0 DNS Query completed successfully
FORMERR RCODE:1 DNS Query Format Error
SERVFAIL RCODE:2 Server failed to complete the DNS request
NXDOMAIN RCODE:3 Domain name does not exist.
NOTIMP RCODE:4 Function not implemented
REFUSED RCODE:5 The server refused to answer for the query
YXDOMAIN RCODE:6 Name that should not exist, does exist
XRRSET RCODE:7 RRset that should not exist, does exist
NOTAUTH RCODE:8 Server not authoritative for the zone
NOTZONE RCODE:9 Name not in zone
Original method docstring:
Transmit single payload, and receive response, if expected.
The actual implementation of the send/receive should be in
``_send_to_target`` and ``_receive_from_target``.
:type payload: str
:param payload: payload to send
:rtype: str
:return: the response (if received)
"""
DNS_RETRUN_CODES = [
'NOERROR',
'FORMERR',
'SERVFAIL',
'NXDOMAIN',
'NOTIMP',
'REFUSED',
'YXDOMAIN',
'XRRSET',
'NOTAUTH',
'NOTZONE'
]
DNS_EXCLUDE = [0, 3, 5]
response = None
trans_report_name = 'transmission_0x%04x' % self.transmission_count
trans_report = Report(trans_report_name)
self.transmission_report = trans_report
self.report.add(trans_report_name, trans_report)
try:
trans_report.add('request (hex)', hexlify(payload).decode())
trans_report.add('request (raw)', '%s' % payload)
trans_report.add('request length', len(payload))
trans_report.add('request time', time.time())
request = hexlify(payload).decode()
request = request if len(request) < 100 else (request[:100] + ' ...')
self.logger.info(f"request({len(payload)}): {request}")
self._send_to_target(payload)
trans_report.success()
if self.expect_response:
try:
response = self._receive_from_target()
trans_report.add('response time', time.time())
trans_report.add('response (hex)', hexlify(response).decode())
trans_report.add('response (raw)', '%s' % response)
trans_report.add('response length', len(response))
trans_report.add('Session ID', str(self._uuid))
printed_response = hexlify(response).decode()
printed_response = printed_response if len(printed_response) < 100 else (printed_response[:100]
+ ' ...')
self.logger.info(f"response({len(response)}): {printed_response}")
server_message = response.split(b',', 0)
reply = codecs.encode(server_message[0], 'hex')
# USE DNS LIB TO HELP DEBUGGING MALFORMED HEADER
debug_response_header = DNSBufferExt(unhexlify(reply))
parsed_dns_response_header = DNSHeader.parse(debug_response_header)
dns_response_message = DNSRecordExt.parse(server_message[0])
if int(parsed_dns_response_header.rcode) not in DNS_EXCLUDE:
self.logger.error(f"DNS response code: "
f"{DNS_RETRUN_CODES[int(parsed_dns_response_header.rcode)]}")
self.logger.error(f"Debug header: {str(parsed_dns_response_header)}")
trans_report.failed(f"Failure in response, code: "
f"{DNS_RETRUN_CODES[int(parsed_dns_response_header.rcode)]}")
trans_report.add('Response', str(dns_response_message))
trans_report.add('traceback', traceback.format_exc())
self.receive_failure = True
self.report.set_status('failed')
except Exception as ex2:
trans_report.failed('failed to receive response: %s' % ex2)
trans_report.add('traceback', traceback.format_exc())
self.logger.error(f"target.transmit - failure in receive (exception: {ex2})")
self.logger.error(traceback.format_exc())
self.receive_failure = True
else:
response = ''
except Exception as ex1:
trans_report.failed('failed to send payload: %s' % ex1)
trans_report.add('traceback', traceback.format_exc())
self.logger.error(f"target.transmit - failure in send (exception: {ex1})")
self.logger.error(traceback.format_exc())
self.send_failure = True
self.transmission_count += 1
return response