1. Build a local FTP server
1. Create a "kiss_ftp" folder on the D drive, and save gg.jpg to this folder.
2. Open the FTP server software, set the user name as "kiss" and the password as "123", select the folder created in step 1, and set the permission to allow uploading and downloading. After the setting is completed, it is in the "User Account Management" menu of the software.
3. Open the FTP server.
2. Data capture for FTP protocol
1. Open the wireshark network packet capture software, select the correct network port to start monitoring (local, need NPcap software support)
2. Open the command prompt, connect to the ftp server and log in. After successful login, all files under the server will be listed.
Ls查看文件
Put上传文件
Get下载文件
dir 查看ftp服务器中的文件
cd 上传到服务器中的位置（ftp服务器下切换目录）
!dir 查看本地文件夹中的文件及目录
lcd 本地当前目录 设置本机要上传文件的位置（lcd c:\）cmd
ftp ip connect to ftp server (ftp>open ip)
user password
ls View the contents of the ftp root directory
get filename (download the file to the ftp server)
3. In the packet capture software, filter out all FTP packets whose destination address is the FTP server.
It is found that the user name and password for login can be seen: kiss: 123 and the gg.jpg picture sent.
3. Grab the get download picture data package in ftp
1. In the filtered results, find the request packet sent to the FTP server to download gg.jpg.
2. After finding the above packet, clear the filter and look for the packet containing the binary header of the jpg file.
Enter TCP Ctrl+F in the search box to find a group (or click the small magnifying glass)
Select packet JFIF of packet byte stream, character string, jpg binary header, press enter.
3. Select the data packet, right-click - "Tracking Flow" - "TCP Tracking Flow", change the file type to raw data, and save it as "gg123.jpg" to the desktop.
Raw data
4. Go back to the desktop and open gg123.jpg.
4. Grab the uploaded put picture data package in ftp
Upload file put xm.png
lcd C:\Users\cheng Switch to the cheng directory under the Users of the C drive
lcd View the current local directory
!dir View local current directory files
Enter ftp in the search box to view the uploaded basic information xm.png
The same method, tcp, packet byte stream, string, png binary header png.
The original data is guaranteed to be viewed on the desktop.
So far, the get download and put upload pictures in ftp have all been demonstrated.