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使用SSH.NET SftpClient设置扩展文件属性

分类: 技术问答 • 2022-04-15 19:38:10
问题描述：

在我使用Renci SSH.NET SFTP库将文件从Windows上传到远程计算机(Ubuntu 16.04 LTS)后，我尝试使用扩展文件属性来存储一些信息.但是属性没有得到保留吗?

I am trying to use the extended file attribute to store some information after I uploaded a file into remote machine (Ubuntu 16.04 LTS) from Windows using Renci SSH.NET SFTP library. But the attributes are not getting preserved?

这就是我尝试设置扩展属性的方式

This how I am trying to set the extended attributes

SftpFileAttributes fileAttrs = sftpClient.GetAttributes(remoteFilePath);
IDictionary<string, string> additionalAttrs = new Dictionary<string, string>();
additionalAttrs.Add(new KeyValuePair<string, string>("user.from", "abc"));
additionalAttrs.Add(new KeyValuePair<string, string>("user.to", "xyz"));
fileAttrs =
    new SftpFileAttributes(
        fileAttrs.LastAccessTime, fileAttrs.LastWriteTime, fileAttrs.Size,
        fileAttrs.UserId, fileAttrs.GroupId, 222, additionalAttrs);
sftpClient.SetAttributes(remoteFilePath, fileAttrs);

那么，您能帮我解决这个问题吗?请注意:出于安全原因，远程计算机配置为仅允许SFTP连接.

So, can you help me how to approach this problem? Note that: The remote machine is configured to allow only SFTP connection for security reason.

答

您不能添加随机扩展属性，例如 user.from .您只能添加服务器明确支持的属性.

You cannot add random extended attributes like user.from. You can add only attributes that your server explicitly supports.

您没有指定正在使用的SFTP服务器.但是，当您连接到Ubuntu服务器时，可以假设它是最广泛的* nix SFTP服务器OpenSSH.而且OpenSSH 不支持任何扩展属性.它静默地忽略所有这些内容.

You didn't specify what SFTP server are you using. But as you are connecting to Ubuntu server, one can assume, that it's the the most widespread *nix SFTP server, OpenSSH. And OpenSSH does not support any extended attribute. It silently ignores all of them.

另请参阅以下讨论:

  • Implementation of xattr in sftp-server for sshfs (OpenSSH)
  • Support extended attribute SFTP requests (ProFTPD)

以及SFTP规范的相关部分:

And the relevant section of SFTP specification:

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