如何在python中发送原始以太网帧? [英] How do I send a raw ethernet frame in python?

问题描述

我需要在几天内完成一个项目，它是基本的客户端和服务器界面.问题是它必须全部是原始套接字.创建它没有问题，我只是停留在发送数据包上.

I need to have a project done in a few days, its a basic client and server interface. The catch is that it needs to be all raw sockets. I have no problem with creating that, I am just stuck on sending the packets.

首先，我尝试将其绑定到接口'en1'，但是它一直给我一个错误nodename not known.当我将其绑定到我的本地IP地址时，它可以正常工作.完成此操作后，我创建了一个原始数据包类，全部为十六进制.然后，我进行了sendto呼叫以在线发送它.

First I tried to bind it to an interface 'en1' but it keeps giving me an error nodename not known. When I bind it to my local ip address it works fine. After completing this I created a raw packet class, its all in hex. I then did a sendto call to send it on the wire.

问题在于，当我使用Wireshark捕获数据包时，它显示为ipv4数据包的有效负载.我不希望它自动生成标头，无论如何这就是我的原始数据包类.您知道我可以取出这些标头的任何方式吗?

The problem is that when I capture the packet by using wireshark it shows up as being the payload of a ipv4 packet. I don't want it to make the headers automatically, that is what my raw packet class was for anyway. Do you know of any way I can take out these headers?

这是我的代码-仅原始函数:

Here is my code - only the raw function:

def raw():
    HOST = gethostbyname('192.168.1.10')

    s = socket(AF_INET, SOCK_RAW, IPPROTO_IP)
    s.bind((HOST, 0))

    s.setsockopt(IPPROTO_IP, IP_HDRINCL, 0) #no headers - it wont work!!

    pckt = packet("\x68\x65\x6c\x6c\x6f")
    netpacket = pckt.getpacket()

    print "Sending.. "
    print ""

    s.sendto(netpacket, ('192.168.1.1', 80))
    data = s.recv(4096)
    print data

这是捕获的数据包，末尾带有 hello :

And here is the captured packet with a hello at the end:

007f 2809 6da2 28cf daee 2156 0800 4500 004d 1bfc 0000 4000 db59 c0a8 010a c0a8 0101* 007f     

2809 6da2 28cf daee 2156 0800 4500 0036 2352 4000 4006 0000 c0a8 010a c0a8 0101 15c0 0050 

0000 0000 0000 0000 8010 813b 0000 68656c6c6f -hello

*此(0101)是有效负载的开始，即使它被认为是数据包的开始.另外，我将不使用任何其他模块，而必须使用套接字.

*This (the 0101) is the start of the payload even though it was supposed to be the start of the packet. Also I am not going to use any other modules, I have to use socket.

推荐答案

由于对此问题的评论，我设法与服务器建立了连接.要做的就是将地址族更改为linux中的af_packet.然后我将其绑定到我的网卡上并发送了.有效.感谢您的帮助！ 这是一些示例代码:

thanks to the comments for this question, i managed to get a connection going with a server. all it took was changing the address family to af_packet in linux. then i binded it to my nic and sent it. it worked. thanks for the help people! here is some example code:

s = socket(AF_PACKET, SOCK_RAW)
s.bind(("en1", 0))
pckt = packet() #my class that initializes the raw hex
data = pckt.getpacket()
s.send(data)
message = s.recv(4096)
print s
print s.decode('hex')

它必须在linux或debian中.据我所知，它在Mac OS X中不起作用.关于Windows的idk.如果您的Mac使用pycap或scapy，它们可以正常工作.

It needs to be in linux or debian. to my knowldege it doesnt work in mac osx. idk about windows. if u have a mac use pycap or scapy, they work fine.

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