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sniffer_ip_header_decode.py
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sniffer_ip_header_decode.py
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import sys
import socket
import os
import struct
from ctypes import *
#要監聽的主機
host ="192.168.0.102"
#我們的IP header
class IP(Structure):
_fields_ = [
("ihl", c_ubyte, 4),
("version", c_ubyte, 4),
("tos", c_ubyte),
("len", c_ushort),
("id", c_ushort),
("offset", c_ushort),
("ttl", c_ubyte),
("protocol_num", c_ubyte),
("sum", c_ushort),
("src", c_ulong),
("dst", c_ulong),
]
def __new__(self,socket_buffer=None):
return self.from_buffer_copy(socket_buffer) #接收一個RAW暫存區,填寫結構
def __init__(self,socket_buffer=None):
#把協定常數對應到名稱
self.protocol_map ={1:"ICMP",6:"TCP",17:"UDP"}
#人類可讀的IP 位址
self.src_address = socket.inet_ntoa(struct.pack("<L",self.src))
self.dst_address = socket.inet_ntoa(struct.pack("<L",self.dst))
#人類可讀的協定
try:
self.protocol = self.protocol_map[self.protocol_num]
except:
self.protocol = str(self.protocol_num)
#看過前一個範例的話應該很眼熟
if os.name == "nt":
socket_protocol = socket.IPPROTO_IP
else:
socket_protocol = socket.IPPROTO_ICMP
sniffer = socket.socket(socket.AF_INET,socket.SOCK_RAW,socket_protocol)
sniffer.bind((host,0))
sniffer.setsockopt(socket.IPPROTO_IP,socket.IP_HDRINCL,1)
if os.name == "nt":
sniffer.ioctl(socket.SIO_RCVALL,socket.RCVALL_ON)
try:
while True:
#讀取一個封包
raw_buffer = sniffer.recvfrom(65565)[0]
#從暫存區開頭20 bytes建立 IP header
ip_header = IP(raw_buffer[0:32])
#顯示偵測到的協定與主機
print("Protocol: %s %s -> %s"%(ip_header.protocol,ip_header.src_address,ip_header.dst_address))
#處理 CTRL-C
except KeyboardInterrupt:
#如果我們用的是windows,就關掉混雜模式
if os.name == "nt":
sniffer.ioctl(socket.SIO_RCVALL,socket.RCVALL_OFF)