[英]add option in tcp with scapy
Upon the receive of a TCP ACK (with option experiment) like this收到这样的 TCP ACK(带有选项实验)
I want to generate a TCP SYN+ACK (with option experiment and Fast Open Cookie) as indicated below我想生成一个 TCP SYN+ACK(带有选项实验和快速打开 Cookie),如下所示
I want to generate the TCP SYN+ACK with scapy so I added我想用 scapy 生成 TCP SYN+ACK 所以我添加了
So I added 254 : ("RFC3692-style Experiment","!HHH")
in the / usr/share/pyshared/scapy/layers/inet.py
like this所以我加了254 : ("RFC3692-style Experiment","!HHH")
在/ usr/share/pyshared/scapy/layers/inet.py
这样
TCPOptions = (
{ 0 : ("EOL",None),
1 : ("NOP",None),
2 : ("MSS","!H"),
3 : ("WScale","!B"),
4 : ("SAckOK",None),
5 : ("SAck","!"),
8 : ("Timestamp","!II"),
14 : ("AltChkSum","!BH"),
15 : ("AltChkSumOpt",None),
25 : ("Mood","!p"),
254 : ("Experiment","!HHHH")
},
{ "EOL":0,
"NOP":1,
"MSS":2,
"WScale":3,
"SAckOK":4,
"SAck":5,
"Timestamp":8,
"AltChkSum":14,
"AltChkSumOpt":15,
"Mood":25,
"Experiment":254
} )
And upon the receive of the TCP ACK (with experiment option), I executhe the following scapy function:在收到 TCP ACK(带有实验选项)后,我执行以下 scapy 函数:
TCP_SYNACK=TCP(sport=Ddport, dport=Ssport, flags="SA", seq=SeqNr, ack=AckNr, options=[('Experiment',0xf989,0xcafe,0x0102,0x0002),('NOP',0),('NOP',0)])
ANSWER=sr1(ip/TCP_SYNACK)
But I got a python error.但是我遇到了python错误。 It looks like I made error in the definition of the option field in the TCP packet with scapy.看起来我在scapy的TCP数据包中的选项字段的定义中出错了。 What I m doing wron?我做错了什么?
我认为您需要以tuple
格式指定可选字段的值,如下所示:
TCP_SYNACK = TCP(sport=Ddport, dport=Ssport, flags="SA", seq=SeqNr, ack=AckNr, options=[('Experiment', (0xf989, 0xcafe, 0x0102, 0x0002)), ('NOP', 0), ('NOP', 0)])
but I had the same problem.但我有同样的问题。 You can actually put an integer as the first element of your options tuple.您实际上可以将整数作为选项元组的第一个元素。 I wanted to put in a hash, so I used the following code in scapy:我想放入一个散列,所以我在 scapy 中使用了以下代码:
pkt = TCP(options=[("NOP", None), (19, "\xff\xff\xff\xff\xff\xff")])
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