标题: ChatGPT编写的文件上传方案

作者: bluerust
创建: 2023-03-08 13:46
更新:
链接: https://scz.617.cn/network/202303081346.txt

背景大致如下

a) Win10位于堡垒机内侧，正常情况下外侧用户通过网页VNC控制Win10
b  Win10的1024/TCP以上端口外侧可达，但无法主动向外connect
c) 无法在Win10上用PowerShell，但找到.net编译器csc.exe，且cmd可用
d) 外侧Linux是己方完全可控主机，Linux->Win10可单向建立TCP连接
e) 原始需求是从Linux向Win10上传Python安装包

首先去找csc.exe，这玩意不在缺省PATH上，但很多Win10上都有，比如

dir /S C:\csc.exe

C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe
C:\Windows\Microsoft.NET\Framework64\v4.0.30319\csc.exe

然后我让ChatGPT用C#写一个收文件的服务端(server.cs)

--------------------------------------------------------------------------
using System;
using System.IO;
using System.Net;
using System.Net.Sockets;

class Program
{
    static void Main ()
    {
        // Set the IP address and port number to listen on
        // Change this to your desired IP address
        IPAddress   IP          = IPAddress.Parse( "x.x.x.x" );
        // Change this to your desired port number
        int         Port        = 1314;
        // Create the TCP listener and start listening for incoming connections
        TcpListener listener    = new TcpListener( IP, Port );
        listener.Start();
        Console.WriteLine( "Server listening on {0}:{1}", IP, Port );
        while ( true )
        {
            // Wait for a client connection to come in
            TcpClient       client      = listener.AcceptTcpClient();
            Console.WriteLine( "Client connected from {0}", client.Client.RemoteEndPoint );
            // Create a binary reader to read incoming data from the client
            BinaryReader    reader      = new BinaryReader( client.GetStream() );
            // Read the first 4 bytes to get the length of the incoming file
            int             FileSize    = reader.ReadInt32();
            // Read the file data into a buffer
            byte[]          FileData    = reader.ReadBytes( FileSize );
            // Close the client connection
            client.Close();
            // Write the file data to disk
            File.WriteAllBytes( "some.bin", FileData );
            Console.WriteLine( "File received and saved to some.bin" );
        }
    }
}
--------------------------------------------------------------------------

看了一眼它这个实现，前4字节是文件大小，之后是文件内容，没法直接和nc配合，
于是我又让ChatGPT用Python写一个发文件的客户端(client.py)

--------------------------------------------------------------------------
import sys, socket

# Set the server IP address and port number
# Change this to your server's IP address
IP      = 'x.x.x.x'
# Change this to your server's port number
Port    = 1314
# Create a TCP socket and connect to the server
Sock    = socket.socket( socket.AF_INET, socket.SOCK_STREAM )
Sock.connect( ( IP, Port ) )
print( 'Connected to server' )

# Open the binary file to send to the server
with open( sys.argv[1], 'rb' ) as f :
    # Read the file data into a buffer
    data    = f.read()
    # Convert the file size to a 4-byte binary representation
    size    = len( data ).to_bytes( 4, byteorder='big' )
    # Send the file size to the server
    Sock.send( size )
    # Send the file data to the server
    Sock.send( data )

print( 'File sent to server' )

# Close the socket
Sock.close()
--------------------------------------------------------------------------

在Win10上编译并执行服务端

C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe /nologo server.cs
server.exe

在Linux上执行客户端

python3 client.py some.bin

在Linux上取文件哈希

sha256sum some.bin

在Win10上校验文件哈希

certutil -hashfile some.bin sha256

整套方案未必是最优解，但胜在快速达成目的，生产力工具，妥妥的。