Python套接字将数据附加到已发送的字节（TCP）

import socket import time s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.connect(('127.0.0.1', 7046)) s.send('39080080380000000000000400000000000000000007092250121018001'.encode()) print ('connected') data = s.recv(1024) s.close() print ('Received', repr(data))

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1条回答

网友

1楼 · 发布于 2024-06-09 13:17:03

我很怀疑问题只是你的程序。将netcat作为未修改程序所连接的服务器进行快速检查，结果显示：

$ nc -l 7046  | hd
00000000  33 39 30 38 30 30 38 30  33 38 30 30 30 30 30 30  |3908008038000000|
00000010  30 30 30 30 30 30 30 34  30 30 30 30 30 30 30 30  |0000000400000000|
00000020  30 30 30 30 30 30 30 30  30 30 30 37 30 39 32 32  |0000000000070922|

换句话说-它只收到你想要发送的东西

不过，服务器的转储很有趣：

30 38 30 30 38 30 33 38 30 30 30 30 30 30 30 30         0800803800000000

它缺少您在开头发送的39。这让我相信服务器将其解释为您发送的数据的长度，并且根据我在Wireshark: ISO 8583-1中找到的信息，这实际上是使用TCP作为传输协议时的情况

只是，看起来服务器并没有使用ASCII39作为您假定的长度，而是使用二进制表示0x3339，即13113十进制，它很好地匹配您的语句“…但是服务器是超过13K字节的接收器”。然后服务器可能会盲目地认为这是消息的长度，而不检查实际长度-这是非常危险的，从Heartbleed attack中可以看出。就像在Heartbleed中一样，你实际上有一个统一化的缓冲区，从你的问题中可以看出，这个缓冲区目前包含了ELF二进制文件的一部分，但也可能包含一些敏感数据

无论如何，您的代码应该按照服务器的预期以二进制形式发送消息长度。这可能是这样的：

import struct
...
msg = b'080080380000000000000400000000000000000007092250121018001'
s.send(struct.pack('>H',len(msg)) + msg)

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