raw socket提供了一種方法來繞過整個網路堆疊遍歷,並直接將乙太網幀輸送到乙個應用程式的方法。
(跳過網路層和傳輸層的過濾解析,因而可以直接處理新的或是自定義的資料報格式)
常用建立raw socket格式的方法:af_packet和pf_socket。af_packet用於win和mac系統。本篇介紹基於linux的pf_packet建立方法。
使用socket模組讀取收到的包
對進行解釋和分析
>>> import socket
>>> import struct
>>> import binascii
>>>
>>> rawsocket = socket.socket(socket.pf_packet,socket.sock_raw,socket.htons(0x0800))
>>> pkt = rawsocket.recvfrom(2048)
>>> ethernetheader = pkt[0][0:14]
>>> ethernetheader
'\x90\xb1\x1cz\xa8\x89p\xf9myf\x9d\x08\x00'
>>> binascii.hexlify(eth_hdr[0])
'90b11c5aa889'
>>> binascii.hexlify(eth_hdr[1])
'70f96d59469d'
>>> binascii.hexlify(eth_hdr[2])
'0800'
>>> ipheader = pkt[0][14:34]
>>> ip_hdr = struct.unpack("!12s4s4s",ipheader)
>>> ip_hdr
('e\x00\x00(u\xe4@\x00~\x06\x91\xbe', '\xc0\xa8d\x9a', '\xc0\xa8/b')
>>> socket.inet_ntoa(ip_hdr[1])
'192.168.100.154'
>>> socket.inet_ntoa(ip_hdr[2])
'192.168.47.66'
>>> tcpheader = pkt[0][34:54]
由此進行資料報解析
由pf_packet進行自定義二層發包和收包(要求二層直連,兩台測試機沒有直連害我搞了一下午= =),簡易**
傳送端
import struct
import socket
s= socket.socket(socket.pf_packet, socket.sock_raw, socket.htons(0x0901))
s.bind(("eth1", 0))
#dst_addr = "\x90\xb1\x1c\x5a\xa8\x89"
dst_addr = "\x00\x0c\x29\x89\xaf\x38"
src_addr = "\x00\x0c\x29\xb6\xe5\xb7"
ethtype = "\x09\x01"
packet = struct.pack("!6s6sh", dst_addr, src_addr, 0x0901)
s.send(packet + "hello!")
接收端
import socket
import struct
import binascii
socket1 = socket.socket(socket.pf_packet, socket.sock_raw, socket.htons(0x0901))
while true:
pkt = socket1.recvfrom(2048)
eth_header = pkt[0][0:14]
eth_hdr = struct.unpack("!6s6sh",eth_header)
print repr(eth_hdr[0])
type = eth_hdr[2]
if( type == 0x0901):
print("get 0x0901")
print("end")
--------------------分割線------------------------
傳送端完整版
import socket
import struct
import binascii
def set_mac(hexstring):
mac_addr=
for i in xrange(0, len(hexstring)/2):
int_c = int(hexstring[i*2:i*2+2],16)
return mac_addr
def packed(dmac, smac, ethtype):
packed = b""
i =0
for value in dmac:
packed += struct.pack("!b", value)
for value in smac:
packed += struct.pack("!b", value)
packed += struct.pack("!h", ethtype)
return packed
socket2 = socket.socket(socket.af_packet, socket.sock_raw)
socket2.bind(('eth1', 0))
data = b""
d_mac = "000c2989af38"
s_mac = "000c29b6e5b7"
dmac = set_mac(d_mac)
smac = set_mac(s_mac)
ethtype = 0x0901
pack_res = packed(dmac, smac, ethtype)
data += pack_res
try:
socket2.send(data)
print('ok')
except:
raise exception("send failed")
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