《Python黑帽子：黑客与渗透测试编程之道》 网络：原始套接字和流量嗅探

Windows和Linux上的包嗅探：

#!/usr/bin/python
import socket
import os

#监听的主机
host = "10.10.10.160"

#创建原始套接字，然后绑定在公开接口上
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))

#设置在捕获的数据包中包含IP头
sniffer.setsockopt(socket.IPPROTO_IP,socket.IP_HDRINCL,1)

#在Windows平台上，我们需要设置IOCTL以启动混杂模式
if os.name == "nt":
    sniffer.ioctl(socket.SIO_RCVALL,socket.RCVALL_ON)

#读取单个数据包
print sniffer.recvfrom(65565)

#在Windows平台上关闭混杂模式
if os.name == "nt":
    sniffer.ioctl(socket.SIO_RCVALL,socket.RCVALL_OFF)

运行结果：

 

解码IP层：

#!/usr/bin/python
#coding=utf-8
import socket
import os
import struct
from ctypes import *

#监听的主机
host = "10.10.10.160"

#IP头定义
class IP(Structure):
    """docstring for IP"""
    _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)

    def __init__(self, socket_buffer=None):
        #协议字段与协议名称对应
        self.protocol_map = {1:"ICMP",6:"TCP",17:"UDP"}

        #可读性更强的IP地址
        self.src_address = socket.inet_ntoa(struct.pack("<L",self.src))
        self.dst_address = socket.inet_ntoa(struct.pack("<L",self.dst))

        #协议类型
        try:
            self.protocol = self.protocol_map[self.protocol_num]
        except:
            self.protocol = str(self.protocol_num)
        
#下面的代码类似于之前的例子
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:
        
        #读取数据包
        raw_buffer = sniffer.recvfrom(65565)[0]

        #将缓冲区的前20个字节按IP头进行解析
        ip_header = IP(raw_buffer[0:20])

        #输出协议和通信双方IP地址
        print "Protocol : %s %s -> %s"%(ip_header.protocol,ip_header.src_address,ip_header.dst_address)
#处理CTRL-C
except KeyboardInterrupt:
    
    #如果运行在Windows上，关闭混杂模式
    if os.name == "nt":
        sniffer.ioctl(socket.SIO_RCVALL,socket.RCVALL_OFF)

运行结果：

Win10上用户有管理员权限执行cmd所以会报错：

Kali下运行会出错，主要是因为32位与64位之间的一些问题：

解决方案：http://stackoverflow.com/questions/29306747/python-sniffing-from-black-hat-python-book

改进的可在Kali中运行的代码：

#!/usr/bin/python
import socket
import os
import struct
from ctypes import *

#监听的主机
host = "10.10.10.160"

#IP头定义
class IP(Structure):
    """docstring for IP"""
    _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_uint32),
        ("dst",            c_uint32)
    ]

    def __new__(self,socket_buffer=None):
        return self.from_buffer_copy(socket_buffer)

    def __init__(self, socket_buffer=None):
        #协议字段与协议名称对应
        self.protocol_map = {1:"ICMP",6:"TCP",17:"UDP"}

        #可读性更强的IP地址
        self.src_address = socket.inet_ntoa(struct.pack("@I",self.src))
        self.dst_address = socket.inet_ntoa(struct.pack("@I",self.dst))

        #协议类型
        try:
            self.protocol = self.protocol_map[self.protocol_num]
        except:
            self.protocol = str(self.protocol_num)
        
#下面的代码类似于之前的例子
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:
        
        #读取数据包
        raw_buffer = sniffer.recvfrom(65565)[0]

        #将缓冲区的前20个字节按IP头进行解析
        ip_header = IP(raw_buffer[0:20])

        #输出协议和通信双方IP地址
        print "Protocol : %s %s -> %s"%(ip_header.protocol,ip_header.src_address,ip_header.dst_address)
#处理CTRL-C
except KeyboardInterrupt:
    
    #如果运行在Windows上，关闭混杂模式
    if os.name == "nt":
        sniffer.ioctl(socket.SIO_RCVALL,socket.RCVALL_OFF)

 运行结果：

解码ICMP：

#!/usr/bin/python
#coding=utf-8
import socket
import os
import struct
from ctypes import *

host = "10.10.10.160"

class IP(Structure):
    """docstring for IP"""
    _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)

    def __init__(self, socket_buffer=None):
        self.protocol_map = {1:"ICMP",6:"TCP",17:"UDP"}

        self.src_address = socket.inet_ntoa(struct.pack("<L",self.src))
        self.dst_address = socket.inet_ntoa(struct.pack("<L",self.dst))

        try:
            self.protocol = self.protocol_map[self.protocol_num]
        except:
            self.protocol = str(self.protocol_num)
        
class ICMP(Structure):
    """docstring for ICMP"""
    _fields_ = [
        ("type",            c_ubyte),
        ("code",            c_ubyte),
        ("checksum",        c_ushort),
        ("unused",        c_ushort),
        ("next_hop_mtu",    c_ushort)
    ]
        
    def __new__(self,socket_buffer):
        return self.from_buffer_copy(socket_buffer)

    def __new__(self,socket_buffer):
        pass

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:
        
        raw_buffer = sniffer.recvfrom(65565)[0]

        ip_header = IP(raw_buffer[0:20])

        print "Protocol : %s %s -> %s"%(ip_header.protocol,ip_header.src_address,ip_header.dst_address)

        #如果为ICMP，进行处理
        if ip_header.protocol == "ICMP":

            #计算ICMP包的起始位置
            offset = ip_header.ihl*4
            buf = raw_buffer[offset:offset + sizeof(ICMP)]

            #解析ICMP数据
            icmp_header = ICMP(buf)

            print "ICMP -> Type : %d  Code : %d"%(icmp_header.type,icmp_header.code)

except KeyboardInterrupt:
    
    if os.name == "nt":
        sniffer.ioctl(socket.SIO_RCVALL,socket.RCVALL_OFF)

但是结果并不能正常解析ICMP，排查的结果是代码中变量buf为None：

完犊子....