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Headers.py
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Headers.py
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import socket
import struct
import textwrap
import time
import binascii
'''
Ethernet frame
DA [Destination MAC Address] : 6 bytes
SA [Source MAC Address] : 6 bytes
Type [0x8870 (Ethertype)] : 2 bytes
'''
class Ethernet:
def __init__(self, r_data):
dest, src, proto = struct.unpack('!6s6sH', r_data[:14])
self.dest_mac = get_mac_addr(dest)
self.src_mac = get_mac_addr(src)
self.proto = proto
self.data = r_data[14:]
class ARP:
def __init__(self, r_data):
tmp = []
tmp = struct.unpack("! H H B B H 6s L 6s L", r_data[:28])
self.hardware_type = tmp[0]
self.protocol_type = tmp[1]
self.hardware_addr_len = tmp[2]
self.protocol_addr_len = tmp[3]
self.opcode = tmp[4]
self.sender_hardware_address = get_mac_addr(tmp[5])
self.sender_protocol_addr = socket.inet_ntoa(struct.pack(">I", tmp[6]))
self.target_hardware_address = get_mac_addr(tmp[7])
self.target_protocol_addr = socket.inet_ntoa(struct.pack(">I", tmp[8]))
self.data = r_data[28:]
class ICMP:
#identifier & sequence number
def __init__(self, r_data):
self.icmp_type, self.code, self.checksum, self.id, self.sequence = struct.unpack('! B B H H H', r_data[:8])
self.data = r_data[8:]
class IPv4:
def __init__(self, r_data):
tmp = []
tmp = struct.unpack("! B B H H H B B H L L", r_data[:20])
version_header_length = tmp[0]
self.version = version_header_length >> 4
self.header_length = (version_header_length & 15) * 4
self.tos = tmp[1] # type of service
self.total_length = tmp[2]
self.ID = tmp[3]
ff = tmp[4]
self.Rb = (ff & 0x8000) >> 15
self.MF = (ff & 0x3FFF) >> 13
self.DF = (ff & 0x7FFF) >> 14
self.fragment_Offset = (ff & 0x1FFF)
self.ttl = tmp[5]
self.protocol = tmp[6]
self.header_checksum = tmp[7]
self.source_address = socket.inet_ntoa(struct.pack(">I", tmp[8]))
self.destination_address = socket.inet_ntoa(struct.pack(">I", tmp[9]))
self.options = []
if self.header_length > 20:
self.options = r_data[20:self.header_length]
self.data = r_data[self.header_length:]
class IPv6:
def __init__(self, r_data):
tmp = []
tmp = struct.unpack("! L 2s s s", r_data[:8])
version_traffic_flow = tmp[0]
self.flow_label = version_traffic_flow & 0xFFFFF
version_traffic = version_traffic_flow >> 20
self.version = version_traffic >> 8
self.traffic_class = version_traffic & 0xFF
self.payload_length = tmp[1]
self.next_header = tmp[2]
self.hop_limit = tmp[3]
self.source_address = socket.inet_ntop(socket.AF_INET6,r_data[8:24])
self.destination_address = socket.inet_ntop(socket.AF_INET6,r_data[24:40])
self.data = r_data[40:]
class TCP:
def __init__(self, r_data):
tmp = []
tmp = struct.unpack('! H H L L H H H H', r_data[:20])
self.src_port = tmp[0]
self.dest_port = tmp[1]
self.sequence = tmp[2]
self.acknowledgment = tmp[3]
offset_reserved_flag = tmp[4]
self.window = tmp[5]
self.checksum = tmp[6]
self.urgent = tmp[7]
self.offset = (offset_reserved_flag >> 12) * 4 # offset is header_length = row count * 32 / 8
self.Reserved = (offset_reserved_flag & 0xE00) >> 9
self.NS = (offset_reserved_flag & 256) >> 8
self.CWR = (offset_reserved_flag & 128) >> 7
self.ECE = (offset_reserved_flag & 64) >> 6
self.URG = (offset_reserved_flag & 32) >> 5
self.ACK = (offset_reserved_flag & 16) >> 4
self.PSH = (offset_reserved_flag & 8) >> 3
self.RST = (offset_reserved_flag & 4) >> 2
self.SYN = (offset_reserved_flag & 2) >> 1
self.FIN = (offset_reserved_flag & 1)
self.options = []
if self.offset > 20:
self.options = r_data[20:self.offset]
self.data = r_data[self.offset:]
class UDP:
def __init__(self, r_data):
self.src_port, self.dest_port, self.length, self.checksum = struct.unpack('! H H H H', r_data[:8])
self.data = r_data[8:]
class HTTP:
def __init__(self, r_data):
try:
self.data = r_data.decode('utf-8')
except:
self.data = r_data
class DNS:
def __init__(self, r_data):
self.id, flags_codes, self.question_count, self.answer_count, self.name_server_count, self.additional_record_count = struct.unpack(
"! 6H", r_data[:12])
self.Rcode = flags_codes & 15
flags_codes = flags_codes >> 4
self.CD = (flags_codes & 1)
self.AD = (flags_codes & 2) >> 1
self.Z = (flags_codes & 4) >> 2
self.RA = (flags_codes & 8) >> 3
self.RD = (flags_codes & 16) >> 4
self.TC = (flags_codes & 32) >> 5
self.AA = (flags_codes & 64) >> 6
flags_codes = flags_codes >> 7
self.opcode = flags_codes & 15
self.QR = flags_codes >> 4
self.data = r_data[12:]
#DNS details
def dns_details(self):
data = self.data
self.Queries = []
try:
if self.question_count > 0:
for i in range(self.question_count):
st = ""
while True:
n = struct.unpack('!B', data[:1])
data = data[1:]
if n[0] == 0:
break
p = struct.unpack('!' + str(n[0]) + 's', data[:n[0]])
tmp = struct.unpack('!' + str(n[0]) + 'B', p[0])
st += ''.join([chr(i) for i in tmp]) + '.'
data = data[n[0]:]
name = st[:-1]
type, clas = struct.unpack('!HH', data[:4])
data = data[4:]
dic = {}
dic['Name'] = name
dic['Type'] = type
dic['Class'] = clas
self.Queries.append(dic)
except:
self.Queries = data[4:]
self.Answers = []
try:
if self.answer_count > 0:
for i in range(self.answer_count):
name = data[:2]
type, clas, ttl, datalength = struct.unpack('! H H L H', data[2:12])
data = data[12:]
Cname = data[:datalength]
data = data[datalength:]
dic = {}
dic['Name'] = name
dic['Type'] = type
dic['Class'] = clas
dic['TTL'] = ttl
dic['Data length'] = datalength
if type == 1: # IPv4
dic['Type'] = 'A (Host Address) (1)'
dic['Address'] = socket.inet_ntoa(Cname)
elif type == 28: # IPv6
dic['Type'] = 'AAAA (IPv6 Address) (28)'
dic['Address'] = socket.inet_ntop(socket.AF_INET6,Cname)
elif type == 5: # CNAME
dic['Type'] = 'CNAME (5)'
cn = ""
while True:
n = struct.unpack('!B', Cname[:1])
Cname = Cname[1:]
if n[0] > len(Cname):
break
if n[0] == 0:
break
p = struct.unpack('!' + str(n[0]) + 's', Cname[:n[0]])
tmp = struct.unpack('!' + str(n[0]) + 'B', p[0])
cn += ''.join([chr(i) for i in tmp]) + '.'
Cname = Cname[n[0]:]
dic['CNAME'] = cn[:-1]
else: # Other types
dic['Type'] = type
cn = ""
while True:
n = struct.unpack('!B', Cname[:1])
Cname = Cname[1:]
if n[0] > len(Cname):
break
if n[0] == 0:
break
p = struct.unpack('!' + str(n[0]) + 's', Cname[:n[0]])
tmp = struct.unpack('!' + str(n[0]) + 'B', p[0])
cn += ''.join([chr(i) for i in tmp]) + '.'
Cname = Cname[n[0]:]
dic['CNAME'] = cn[:-1]
self.Answers.append(dic)
except:
self.Answers = data
self.Authoritative = []
try:
if self.name_server_count > 0:
for i in range(self.name_server_count):
name = data[:2]
type, clas, ttl, datalength = struct.unpack('! H H L H', data[2:12])
data = data[12:]
info = data[: datalength]
data = data[datalength:]
primary_responsible = info[:-20]
info2 = info[-20:]
primary = ""
while True:
n = struct.unpack('!B', primary_responsible[:1])
primary_responsible = primary_responsible[1:]
if n[0] > len(primary_responsible):
break
if n[0] == 0:
break
p = struct.unpack('!' + str(n[0]) + 's', primary_responsible[:n[0]])
tmp = struct.unpack('!' + str(n[0]) + 'B', p[0])
primary += ''.join([chr(i) for i in tmp]) + '.'
primary_responsible = primary_responsible[n[0]:]
responsible = ""
while len(primary_responsible) > 0:
n = struct.unpack('!B', primary_responsible[:1])
primary_responsible = primary_responsible[1:]
if n[0] > len(primary_responsible):
break
p = struct.unpack('!' + str(n[0]) + 's', primary_responsible[:n[0]])
tmp = struct.unpack('!' + str(n[0]) + 'B', p[0])
responsible += ''.join([chr(i) for i in tmp]) + '.'
primary_responsible = primary_responsible[n[0]:]
Serialnumber, Refreshinterval, Retryinterval, Expirelimit, MinimumTTL = struct.unpack('!5L', info2[:20])
dic = {}
dic['Name'] = name
dic['Type'] = type
dic['Class'] = clas
dic['TTL'] = ttl
dic['Data length'] = datalength
dic['Primary name server'] = ''
dic['Responsible authoritys mailbox'] = ''
dic['Serial number'] = Serialnumber
dic['Refresh interval'] = Refreshinterval
dic['Retry interval'] = Retryinterval
dic['Expire limit'] = Expirelimit
dic['Minimum TTL'] = MinimumTTL
self.Authoritative.append(dic)
except:
self.Authoritative = data
self.Additinal = []
try:
if self.additional_record_count > 0:
for i in range(self.additional_record_count):
name, type, payload, higher, version, Z, datalength = struct.unpack('!B H H B B H H', data)
dic = {}
dic['Name'] = name
dic['Type'] = type
dic['UDP payload size'] = payload
dic['Higher bits in extended RCODE'] = higher
dic['Version'] = version
dic['Z'] = Z
dic['Data length'] = datalength
data = data[11:]
self.Additinal.append(dic)
#end of DNS details
except:
self.additional_record_count = data[11:]
# print DNS details
def print_details(self):
print()
try:
if self.question_count > 0:
print("\t\t - Queries:")
for i in range(self.question_count):
print('\t\t\t - ' + 'Name: {}, Type: {}, Class: {}'.format(self.Queries[i]['Name'], self.Queries[i]['Type'],
self.Queries[i]['Class']))
except:
print(self.Queries)
try:
if self.answer_count > 0:
print("\t\t - Answers:")
for i in range(self.answer_count):
if self.Answers[i]['Type'] == 'A (Host Address) (1)' or self.Answers[i]['Type'] == 'AAAA (IPv6 Address) (28)':
print(
'\t\t\t - ' + 'Name: {}, Type: {}, Class: {}, Time tp live: {}, Data length: {}, Address: {}'.format(
self.Answers[i]['Name'], self.Answers[i]['Type'],
self.Answers[i]['Class'], self.Answers[i]['TTL'], self.Answers[i]['Data length'],
self.Answers[i]['Address']))
elif self.Answers[i]['Type'] == 'CNAME (5)':
print(
'\t\t\t - ' + 'Name: {}, Type: {}, Class: {}, Time tp live: {}, Data length: {}, CNAME: {}'.format(
self.Answers[i]['Name'], self.Answers[i]['Type'],
self.Answers[i]['Class'], self.Answers[i]['TTL'], self.Answers[i]['Data length'],
self.Answers[i]['CNAME']))
else:
print(
'\t\t\t - ' + 'Name: {}, Type: {}, Class: {}, Time tp live: {}, Data length: {}, CNAME: {}'.format(
self.Answers['Name'], self.Answers[i]['Type'],
self.Answers['Class'], self.Answers[i]['TTL'], self.Answers[i]['Data length'],
self.Answers['CNAME']))
except:
print(self.Answers)
try:
if self.name_server_count > 0:
print("\t\t - Authoritative nameservers:")
auth = self.Authoritative
for i in range(self.name_server_count):
print('\t\t\t - ' + 'Name: {}, Type: {}, Class: {}'.format(auth[i]['Name'], auth[i]['Type'],
auth[i]['Class']))
print('\t\t\t - ' + 'Time to live: {}, Data length: {}'.format(auth[i]['TTL'],
auth[i]['Data length']))
print('\t\t\t - ' + 'Primary name server: {}'.format(auth[i]['Primary name server']))
print('\t\t\t - ' + 'Responsible authoritys mailbox: {}'.format(
auth[i]['Responsible authoritys mailbox']))
print('\t\t\t - ' + 'Serial number: {}'.format(auth[i]['Serial number']))
print('\t\t\t - ' + 'Refresh interval: {}'.format(auth[i]['Refresh interval']))
print('\t\t\t - ' + 'Retry interval: {}'.format(auth[i]['Retry interval']))
print('\t\t\t - ' + 'Expire limit: {}'.format(auth[i]['Expire limit']))
print('\t\t\t - ' + 'Minimum TTL: {}'.format(auth[i]['Minimum TTL']))
except:
print(self.Authoritative)
try:
if self.additional_record_count > 0:
print("\t\t - Additional records:")
for i in range(self.additional_record_count):
print('\t\t\t - ' + 'Name: {}, Type: {}, UDP payload size: {}'.format(self.Additinal[i]['Name'],
self.Additinal[i]['Type'],
self.Additinal[i]['UDP payload size']))
print('\t\t\t - ' + 'Higher bits in extended RCODE: {}, Version: {}'.format(
self.Additinal[i]['Higher bits in extended RCODE'], self.Additinal[i]['Version']))
print('\t\t\t - ' + 'Z: {}, Data length: {}'.format(self.Additinal[i]['Z'], self.Additinal[i]['Data length']))
except:
print(self.Additinal)
def get_mac_addr(bytes_addr):
bytes_str = map('{:02x}'.format, bytes_addr)
mac_addr = ':'.join(bytes_str)
return mac_addr
def print_data(tab, string):
size = 80 - len(tab)
string = ''.join(r'\x{:02x}'.format(byte) for byte in string)
return '\n'.join([tab + line for line in textwrap.wrap(string, size)])
# Pcap_header_format = '@ I H H i I I I '
# Global Header Values
PCAP_MAGICAL_NUMBER = 0xa1b2c3d4
PCAP_MJ_VERN_NUMBER = 2
PCAP_MI_VERN_NUMBER = 4
PCAP_LOCAL_CORECTIN = 0
PCAP_ACCUR_TIMSTAMP = 0
PCAP_MAX_LENGTH_CAP = 65535
PCAP_DATA_LINK_TYPE = 1
class Pcap:
def __init__(self, filename, link_type=PCAP_DATA_LINK_TYPE):
self.pcap_file = open(filename, 'wb')
self.pcap_file.write(struct.pack('@ I H H i I I I ', PCAP_MAGICAL_NUMBER, PCAP_MJ_VERN_NUMBER, PCAP_MI_VERN_NUMBER,
PCAP_LOCAL_CORECTIN, PCAP_ACCUR_TIMSTAMP, PCAP_MAX_LENGTH_CAP, link_type))
def write(self, data):
ts_sec, ts_usec = map(int, str(time.time()).split('.'))
length = len(data)
self.pcap_file.write(struct.pack('@ I I I I', ts_sec, ts_usec, length, length))
self.pcap_file.write(data)
def close(self):
self.pcap_file.close()