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packet-sniffer2.py
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packet-sniffer2.py
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import socket
import struct
import textwrap
import binascii
import struct
import sys,time
TAB_1 = '\t - '
TAB_2 = '\t\t - '
TAB_3 = '\t\t\t - '
TAB_4 = '\t\t\t\t - '
DATA_TAB_1 = '\t '
DATA_TAB_2 = '\t\t '
DATA_TAB_3 = '\t\t\t '
DATA_TAB_4 = '\t\t\t\t '
print(" usage : python packet-sniffer2.py <ICMP/UDP/TCP>")
try:
def main():
conn = socket.socket(socket.PF_PACKET, socket.SOCK_RAW, socket.ntohs(3))
filters = (["ICMP", 1, "ICMPv6"],["UDP", 17, "UDP"], ["TCP", 6, "TCP"])
filter = []
if len(sys.argv) == 2:
print("This is the filter: ", sys.argv[1])
for f in filters:
if sys .argv[1] == f[0]:
filter = f
while True:
raw_data, addr = conn.recvfrom(65536)
dest_mac, src_mac, eth_proto, data = ethernet_frame(raw_data)
if eth_proto == 'IPV6':
newPacket, nextProto = ipv6Header(data, filter)
printPacketsV6(filter, nextProto, newPacket)
elif eth_proto == 'IPV4':
printPacketsV4(filter, data, raw_data)
def printPacketsV4(filter, data, raw_data):
(version, header_length, ttl, proto, src, target, data) = ipv4_Packet(data)
# ICMP
if proto == 1 and (len(filter) == 0 or filter[1] == 1):
icmp_type, code, checksum, data = icmp_packet(data)
print ("*******************ICMP***********************")
print ("\tICMP type: %s" % (icmp_type))
print ("\tICMP code: %s" % (code))
print ("\tICMP checksum: %s" % (checksum))
# TCP
elif proto == 6 and (len(filter) == 0 or filter[1] == 6):
print("*******************TCPv4***********************")
print('Version: {}\nHeader Length: {}\nTTL: {}'.format(version, header_length, ttl))
print('protocol: {}\nSource: {}\nTarget: {}'.format(proto, src, target))
src_port, dest_port, sequence, acknowledgment, flag_urg, flag_ack, flag_psh, flag_rst, flag_syn, flag_fin = struct.unpack(
'! H H L L H H H H H H', raw_data[:24])
print('*****TCP Segment*****')
print('Source Port: {}\nDestination Port: {}'.format(src_port, dest_port))
print('Sequence: {}\nAcknowledgment: {}'.format(sequence, acknowledgment))
print('*****Flags*****')
print('URG: {}\nACK: {}\nPSH: {}'.format(flag_urg, flag_ack, flag_psh))
print('RST: {}\nSYN: {}\nFIN:{}'.format(flag_rst, flag_syn, flag_fin))
if len(data) > 0:
# HTTP
if src_port == 80 or dest_port == 80:
print('*****HTTP Data*****')
try:
http = HTTP(data)
http_info = str(http.data).split('\n')
for line in http_info:
print(str(line))
except:
print(format_output_line("",data))
else:
print('*****TCP Data*****')
print(format_output_line("",data))
# UDP
elif proto == 17 and (len(filter) == 0 or filter[1] == 17):
print("*******************UDPv4***********************")
print('Version: {}\nHeader Length: {}\nTTL: {}'.format(version, header_length, ttl))
print('protocol: {}\nSource: {}\nTarget: {}'.format(proto, src, target))
src_port, dest_port, length, data = udp_seg(data)
print('*****UDP Segment*****')
print('Source Port: {}\nDestination Port: {}\nLength: {}'.format(src_port, dest_port, length))
def printPacketsV6(filter, nextProto, newPacket):
remainingPacket = ""
if (nextProto == 'ICMPv6' and (len(filter) == 0 or filter[2] == "ICMPv6")):
remainingPacket = icmpv6Header(newPacket)
elif (nextProto == 'TCP' and (len(filter) == 0 or filter[2] == "TCP")):
remainingPacket = tcpHeader(newPacket)
elif (nextProto == 'UDP' and (len(filter) == 0 or filter[2] == "UDP")):
remainingPacket = udpHeader(newPacket)
return remainingPacket
def tcpHeader(newPacket):
# 2 unsigned short,2unsigned Int,4 unsigned short. 2byt+2byt+4byt+4byt+2byt+2byt+2byt+2byt==20byts
packet = struct.unpack("!2H2I4H", newPacket[0:20])
srcPort = packet[0]
dstPort = packet[1]
sqncNum = packet[2]
acknNum = packet[3]
dataOffset = packet[4] >> 12
reserved = (packet[4] >> 6) & 0x003F
tcpFlags = packet[4] & 0x003F
urgFlag = tcpFlags & 0x0020
ackFlag = tcpFlags & 0x0010
pushFlag = tcpFlags & 0x0008
resetFlag = tcpFlags & 0x0004
synFlag = tcpFlags & 0x0002
finFlag = tcpFlags & 0x0001
window = packet[5]
checkSum = packet[6]
urgPntr = packet[7]
print ("*******************TCP***********************")
print ("\tSource Port: "+str(srcPort) )
print ("\tDestination Port: "+str(dstPort) )
print ("\tSequence Number: "+str(sqncNum) )
print ("\tAck. Number: "+str(acknNum) )
print ("\tData Offset: "+str(dataOffset) )
print ("\tReserved: "+str(reserved) )
print ("\tTCP Flags: "+str(tcpFlags) )
if(urgFlag == 32):
print ("\tUrgent Flag: Set")
if(ackFlag == 16):
print ("\tAck Flag: Set")
if(pushFlag == 8):
print ("\tPush Flag: Set")
if(resetFlag == 4):
print ("\tReset Flag: Set")
if(synFlag == 2):
print ("\tSyn Flag: Set")
if(finFlag == True):
print ("\tFin Flag: Set")
print ("\tWindow: "+str(window))
print ("\tChecksum: "+str(checkSum))
print ("\tUrgent Pointer: "+str(urgPntr))
print (" ")
packet = packet[20:]
return packet
def udpHeader(newPacket):
packet = struct.unpack("!4H", newPacket[0:8])
srcPort = packet[0]
dstPort = packet[1]
lenght = packet[2]
checkSum = packet[3]
print ("*******************UDP***********************")
print ("\tSource Port: "+str(srcPort))
print ("\tDestination Port: "+str(dstPort))
print ("\tLenght: "+str(lenght))
print ("\tChecksum: "+str(checkSum))
print (" ")
packet = packet[8:]
return packet
def icmpv6Header(data):
ipv6_icmp_type, ipv6_icmp_code, ipv6_icmp_chekcsum = struct.unpack(
">BBH", data[:4])
print ("*******************ICMPv6***********************")
print ("\tICMPv6 type: %s" % (ipv6_icmp_type))
print ("\tICMPv6 code: %s" % (ipv6_icmp_code))
print ("\tICMPv6 checksum: %s" % (ipv6_icmp_chekcsum))
data = data[4:]
return data
def nextHeader(ipv6_next_header):
if (ipv6_next_header == 6):
ipv6_next_header = 'TCP'
elif (ipv6_next_header == 17):
ipv6_next_header = 'UDP'
elif (ipv6_next_header == 43):
ipv6_next_header = 'Routing'
elif (ipv6_next_header == 1):
ipv6_next_header = 'ICMP'
elif (ipv6_next_header == 58):
ipv6_next_header = 'ICMPv6'
elif (ipv6_next_header == 44):
ipv6_next_header = 'Fragment'
elif (ipv6_next_header == 0):
ipv6_next_header = 'HOPOPT'
elif (ipv6_next_header == 60):
ipv6_next_header = 'Destination'
elif (ipv6_next_header == 51):
ipv6_next_header = 'Authentication'
elif (ipv6_next_header == 50):
ipv6_next_header = 'Encapsuling'
return ipv6_next_header
def ipv6Header(data, filter):
ipv6_first_word, ipv6_payload_legth, ipv6_next_header, ipv6_hoplimit = struct.unpack(
">IHBB", data[0:8])
ipv6_src_ip = socket.inet_ntop(socket.AF_INET6, data[8:24])
ipv6_dst_ip = socket.inet_ntop(socket.AF_INET6, data[24:40])
bin(ipv6_first_word)
"{0:b}".format(ipv6_first_word)
version = ipv6_first_word >> 28
traffic_class = ipv6_first_word >> 16
traffic_class = int(traffic_class) & 4095
flow_label = int(ipv6_first_word) & 65535
ipv6_next_header = nextHeader(ipv6_next_header)
data = data[40:]
return data, ipv6_next_header
# Unpack Ethernet Frame
def ethernet_frame(data):
proto = ""
IpHeader = struct.unpack("!6s6sH",data[0:14])
dstMac = binascii.hexlify(IpHeader[0])
srcMac = binascii.hexlify(IpHeader[1])
protoType = IpHeader[2]
nextProto = hex(protoType)
if (nextProto == '0x800'):
proto = 'IPV4'
elif (nextProto == '0x86dd'):
proto = 'IPV6'
data = data[14:]
return dstMac, srcMac, proto, data
# Format MAC Address
def get_mac_addr(bytes_addr):
bytes_str = map('{:02x}'.format, bytes_addr)
mac_addr = ':'.join(bytes_str).upper()
return mac_addr
# Unpack IPv4 Packets Recieved
def ipv4_Packet(data):
version_header_len = data[0]
version = version_header_len >> 4
header_len = (version_header_len & 15) * 4
ttl, proto, src, target = struct.unpack('! 8x B B 2x 4s 4s', data[:20])
return version, header_len, ttl, proto, ipv4(src), ipv4(target), data[header_len:]
# Returns Formatted IP Address
def ipv4(addr):
return '.'.join(map(str, addr))
# Unpacks for any ICMP Packet
def icmp_packet(data):
icmp_type, code, checksum = struct.unpack('! B B H', data[:4])
return icmp_type, code, checksum, data[4:]
# Unpacks for any TCP Packet
def tcp_seg(data):
(src_port, dest_port, sequence, acknowledgement, offset_reserved_flag) = struct.unpack('! H H L L H', data[:14])
offset = (offset_reserved_flag >> 12) * 4
flag_urg = (offset_reserved_flag & 32) >> 5
flag_ack = (offset_reserved_flag & 32) >> 4
flag_psh = (offset_reserved_flag & 32) >> 3
flag_rst = (offset_reserved_flag & 32) >> 2
flag_syn = (offset_reserved_flag & 32) >> 1
flag_fin = (offset_reserved_flag & 32) >> 1
return src_port, dest_port, sequence, acknowledgement, flag_urg, flag_ack, flag_psh, flag_rst, flag_syn, flag_fin, data[offset:]
# Unpacks for any UDP Packet
def udp_seg(data):
src_port, dest_port, size = struct.unpack('! H H 2x H', data[:8])
return src_port, dest_port, size, data[8:]
# Formats the output line
def format_output_line(prefix, string):
size=80
size -= len(prefix)
if isinstance(string, bytes):
string = ''.join(r'\x{:02x}'.format(byte) for byte in string)
if size % 2:
size-= 1
return '\n'.join([prefix + line for line in textwrap.wrap(string, size)])
main()
except KeyboardInterrupt:
print("\n\033[91m [-] Exiting...")
time.sleep(4)