代碼: 選擇全部
#Packet sniffer in python
#For Linux - Sniffs all incoming and outgoing packets :)
import socket
from struct import *
#Convert a string of 6 characters of ethernet address into a dash separated hex string
def eth_addr (a) :
b = "%.2x-%.2x-%.2x-%.2x-%.2x-%.2x" % (ord(a[0]) , ord(a[1]) , ord(a[2]), ord(a[3]), ord(a[4]) , ord(a[5]))
return b
#create an PACKET , RAW SOCKET
#define ETH_P_ALL 0x0003 /* Every packet (be careful!!!) */
s = socket.socket( socket.AF_PACKET , socket.SOCK_RAW , socket.ntohs(0x0003))
# receive a packet
while True:
packet = s.recvfrom(65565)
#packet string from tuple
packet = packet[0]
#parse ethernet header
eth_length = 14
eth_header = packet[:eth_length]
eth = unpack('!6s6sH' , eth_header)
eth_protocol = socket.ntohs(eth[2])
print 'Destination MAC : ' + eth_addr(packet[0:6]) + ' Source MAC : ' + eth_addr(packet[6:12]) + ' Protocol : ' + str(eth_protocol)
#Parse IP packets
if eth_protocol == 8 :
#Parse IP header
#take first 20 characters for the ip header
ip_header = packet[eth_length:20+eth_length]
#now unpack them :)
iph = unpack('!BBHHHBBH4s4s' , ip_header)
version_ihl = iph[0]
version = version_ihl >> 4
ihl = version_ihl & 0xF
iph_length = ihl * 4
ttl = iph[5]
protocol = iph[6]
s_addr = socket.inet_ntoa(iph[8]);
d_addr = socket.inet_ntoa(iph[9]);
print 'Version : ' + str(version) + ' IP Header Length : ' + str(ihl) + ' TTL : ' + str(ttl) + ' Protocol : ' + str(protocol) + ' Source Address : ' + str(s_addr) + ' Destination Address : ' + str(d_addr)
#TCP protocol
if protocol == 6 :
t = iph_length + eth_length
tcp_header = packet[t:t+20]
#now unpack them :)
tcph = unpack('!HHLLBBHHH' , tcp_header)
source_port = tcph[0]
dest_port = tcph[1]
sequence = tcph[2]
acknowledgement = tcph[3]
doff_reserved = tcph[4]
tcph_length = doff_reserved >> 4
print 'Source Port : ' + str(source_port) + ' Dest Port : ' + str(dest_port) + ' Sequence Number : ' + str(sequence) + ' Acknowledgement : ' + str(acknowledgement) + ' TCP header length : ' + str(tcph_length)
h_size = eth_length + iph_length + tcph_length * 4
data_size = len(packet) - h_size
#get data from the packet
data = packet[data_size:]
print 'Data : ' + data
#ICMP Packets
elif protocol == 1 :
u = iph_length + eth_length
icmph_length = 4
icmp_header = packet[u:u+4]
#now unpack them :)
icmph = unpack('!BBH' , icmp_header)
icmp_type = icmph[0]
code = icmph[1]
checksum = icmph[2]
print 'Type : ' + str(icmp_type) + ' Code : ' + str(code) + ' Checksum : ' + str(checksum)
h_size = eth_length + iph_length + icmph_length
data_size = len(packet) - h_size
#get data from the packet
data = packet[data_size:]
print 'Data : ' + data
#UDP packets
elif protocol == 17 :
u = iph_length + eth_length
udph_length = 8
udp_header = packet[u:u+8]
#now unpack them :)
udph = unpack('!HHHH' , udp_header)
source_port = udph[0]
dest_port = udph[1]
length = udph[2]
checksum = udph[3]
print 'Source Port : ' + str(source_port) + ' Dest Port : ' + str(dest_port) + ' Length : ' + str(length) + ' Checksum : ' + str(checksum)
h_size = eth_length + iph_length + udph_length
data_size = len(packet) - h_size
#get data from the packet
data = packet[data_size:]
print 'Data : ' + data
#some other IP packet like IGMP
else :
print 'Protocol other than TCP/UDP/ICMP'
print