更好地理解网络概念并提高我的python技能我正在尝试用python实现数据包嗅探器。我刚开始学习python,所以代码当然可以优化;)
我已经实现了一个数据包嗅探器,它解压缩了以太网帧和arp头。我想用原始套接字来实现它,因为我想要了解这些头文件中的每个字节,所以请不要使用scapy帮助:)
问题是,我不会得到任何arp回复数据包。它始终是操作码1和我
这是我的源代码:
import socket
import struct
import binascii
rawSocket = socket.socket(socket.PF_PACKET, socket.SOCK_RAW, socket.htons(0x0806))
while True:
packet = rawSocket.recvfrom(2048)
ethernet_header = packet[0][0:14]
ethernet_detailed = struct.unpack("!6s6s2s", ethernet_header)
arp_header = packet[0][14:42]
arp_detailed = struct.unpack("2s2s1s1s2s6s4s6s4s", arp_header)
print "****************_ETHERNET_FRAME_****************"
print "Dest MAC: ", binascii.hexlify(ethernet_detailed[0])
print "Source MAC: ", binascii.hexlify(ethernet_detailed[1])
print "Type: ", binascii.hexlify(ethernet_detailed[2])
print "************************************************"
print "******************_ARP_HEADER_******************"
print "Hardware type: ", binascii.hexlify(arp_detailed[0])
print "Protocol type: ", binascii.hexlify(arp_detailed[1])
print "Hardware size: ", binascii.hexlify(arp_detailed[2])
print "Protocol size: ", binascii.hexlify(arp_detailed[3])
print "Opcode: ", binascii.hexlify(arp_detailed[4])
print "Source MAC: ", binascii.hexlify(arp_detailed[5])
print "Source IP: ", socket.inet_ntoa(arp_detailed[6])
print "Dest MAC: ", binascii.hexlify(arp_detailed[7])
print "Dest IP: ", socket.inet_ntoa(arp_detailed[8])
print "*************************************************\n"
有人可以解释一下我为什么没有得到这些响应包?
输出:
****************_ETHERNET_FRAME_****************
Dest MAC: ffffffffffff
Source MAC: 0012bfc87243
Type: 0806
************************************************
******************_ARP_HEADER_******************
Hardware type: 0001
Protocol type: 0800
Hardware size: 06
Protocol size: 04
Opcode: 0001
Source MAC: 0012bfc87243
Source IP: 192.168.2.1
Dest MAC: 000000000000
Dest IP: 192.168.2.226
*************************************************
到目前为止感谢! :)
答案 0 :(得分:14)
我认为您需要指定套接字协议号0x0003
来嗅探所有内容,然后在事后过滤掉非ARP数据包。这对我有用:
import socket
import struct
import binascii
rawSocket = socket.socket(socket.AF_PACKET, socket.SOCK_RAW, socket.htons(0x0003))
while True:
packet = rawSocket.recvfrom(2048)
ethernet_header = packet[0][0:14]
ethernet_detailed = struct.unpack("!6s6s2s", ethernet_header)
arp_header = packet[0][14:42]
arp_detailed = struct.unpack("2s2s1s1s2s6s4s6s4s", arp_header)
# skip non-ARP packets
ethertype = ethernet_detailed[2]
if ethertype != '\x08\x06':
continue
print "****************_ETHERNET_FRAME_****************"
print "Dest MAC: ", binascii.hexlify(ethernet_detailed[0])
print "Source MAC: ", binascii.hexlify(ethernet_detailed[1])
print "Type: ", binascii.hexlify(ethertype)
print "************************************************"
print "******************_ARP_HEADER_******************"
print "Hardware type: ", binascii.hexlify(arp_detailed[0])
print "Protocol type: ", binascii.hexlify(arp_detailed[1])
print "Hardware size: ", binascii.hexlify(arp_detailed[2])
print "Protocol size: ", binascii.hexlify(arp_detailed[3])
print "Opcode: ", binascii.hexlify(arp_detailed[4])
print "Source MAC: ", binascii.hexlify(arp_detailed[5])
print "Source IP: ", socket.inet_ntoa(arp_detailed[6])
print "Dest MAC: ", binascii.hexlify(arp_detailed[7])
print "Dest IP: ", socket.inet_ntoa(arp_detailed[8])
print "*************************************************\n"
使用来自同一主机的arpping
广播及其回复的示例输出:
****************_ETHERNET_FRAME_****************
Dest MAC: ffffffffffff
Source MAC: 000c29eb37bf
Type: 0806
************************************************
******************_ARP_HEADER_******************
Hardware type: 0001
Protocol type: 0800
Hardware size: 06
Protocol size: 04
Opcode: 0001
Source MAC: 000c29eb37bf
Source IP: 192.168.16.133
Dest MAC: ffffffffffff
Dest IP: 192.168.16.2
*************************************************
****************_ETHERNET_FRAME_****************
Dest MAC: 000c29eb37bf
Source MAC: 005056f37861
Type: 0806
************************************************
******************_ARP_HEADER_******************
Hardware type: 0001
Protocol type: 0800
Hardware size: 06
Protocol size: 04
Opcode: 0002
Source MAC: 005056f37861
Source IP: 192.168.16.2
Dest MAC: 000c29eb37bf
Dest IP: 192.168.16.133
*************************************************