如果可能,在C#中使用FtpWebRequest实现没有第三方dll的FTP / SFTP

时间:2012-05-18 17:46:36

标签: c# .net winforms

我试图通过C#中的FtpWebRequest类来实现ftp / sftp,但直到现在还没有成功。

我不想使用任何第三方免费或付费的dll。

凭证就像

  1. hostname = sftp.xyz.com
  2. userid = abc
  3. 密码= 123
  4. 我能够使用IP地址实现ftp,但无法使用凭据获取上述主机名的sftp。

    对于sftp,我已将FtpWebRequest类的EnableSsl属性设置为true,但是错误无法连接到远程服务器。

    我可以使用相同的凭据和主机名连接Filezilla,但不能通过代码连接。

    我观察了filezilla,它将主机名从sftp.xyz.com更改为sftp://sftp.xyz.com 在文本框和命令行中,它将用户标识更改为abc@sftp.xyz.com

    我在代码中做了同样的事情,但sftp没有成功。

    请急需帮助。提前谢谢。

    到目前为止,我的代码如下:

    private static void ProcessSFTPFile()
    {
        try
        {
            string[] fileList = null;
            StringBuilder result = new StringBuilder();
    
            string uri = "ftp://sftp.xyz.com";
    
            FtpWebRequest ftpRequest = (FtpWebRequest)WebRequest.Create(new Uri(uri));
            ftpRequest.Method = WebRequestMethods.Ftp.ListDirectoryDetails;
            ftpRequest.EnableSsl = true;
            ftpRequest.Credentials = new NetworkCredential("abc@sftp.xyz.com", "123");
            ftpRequest.UsePassive = true;
            ftpRequest.Timeout = System.Threading.Timeout.Infinite;
    
            //ftpRequest.AuthenticationLevel = Security.AuthenticationLevel.MutualAuthRequested;
            //ftpRequest.Proxy = null;
            ftpRequest.KeepAlive = true;
            ftpRequest.UseBinary = true;
    
            //Hook a callback to verify the remote certificate 
            ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback(ValidateServerCertificate);
            //ServicePointManager.ServerCertificateValidationCallback = ((sender, certificate, chain, sslPolicyErrors) => true);
    
            FtpWebResponse response = (FtpWebResponse)ftpRequest.GetResponse();
            StreamReader reader = new StreamReader(response.GetResponseStream());
            string line = reader.ReadLine();
            while (line != null)
            {
                result.Append("ftp://sftp.xyz.com" + line);
                result.Append("\n");
                line = reader.ReadLine();
            }
    
            if (result.Length != 0)
            {
                // to remove the trailing '\n'
                result.Remove(result.ToString().LastIndexOf('\n'), 1);
    
                // extracting the array of all ftp file paths
                fileList = result.ToString().Split('\n');
            }
    
        }
        catch (Exception ex)
        {
            Console.WriteLine(ex.Message.ToString());
            Console.ReadLine();
        }
    }
    
    public static bool ValidateServerCertificate(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors sslPolicyErrors)
    {
        if (certificate.Subject.Contains("CN=sftp.xyz.com"))
        {
            return true;
        }
        else
        {
            return false;
        }
    }
    

3 个答案:

答案 0 :(得分:12)

UPDATE:

如果使用BizTalk, you can work with the SFTP Adapter,请使用ESB Toolkit。它自2010年以来一直得到支持。有人想知道为什么它没有进入.Net Framework

  1. BizTalk Server 2013: Creating Custom Adapter Provider in ESB Toolkit SFTP As an Example
  2. BizTalk Server 2013: How to use SFTP Adapter
  3. MSDN Docs
  4. -

    不幸的是,目前只需要与框架有很多工作要做。放置sftp协议前缀不足以make-it-work今天仍然没有内置的.Net Framework支持,可能在将来。

    <强> -------------------------------------------- -------------

    1)要试用的好图书馆是SSHNet

    <强> -------------------------------------------- -------------

    它有:

    1. 更多功能,包括内置流媒体支持。
    2. API文档
    3. 一个更简单的API代码
    4. 文档中的示例代码:

      列出目录

      /// <summary>
      /// This sample will list the contents of the current directory.
      /// </summary>
      public void ListDirectory()
      {
          string host            = "";
          string username        = "";
          string password        = "";
          string remoteDirectory = "."; // . always refers to the current directory.
      
          using (var sftp = new SftpClient(host, username, password))
          {
              sftp.Connect();
      
              var files = sftp.ListDirectory(remoteDirectory);
              foreach (var file in files)
              {
                  Console.WriteLine(file.FullName);
              }
          }
      }
      

      上传文件

      /// <summary>
      /// This sample will upload a file on your local machine to the remote system.
      /// </summary>
      public void UploadFile()
      {
          string host           = "";
          string username       = "";
          string password       = "";
          string localFileName  = "";
          string remoteFileName = System.IO.Path.GetFileName(localFile);
      
          using (var sftp = new SftpClient(host, username, password))
          {
              sftp.Connect();
      
              using (var file = File.OpenRead(localFileName))
              {
                  sftp.UploadFile(remoteFileName, file);
              }
      
              sftp.Disconnect();
          }
      }
      

      下载文件

      /// <summary>
      /// This sample will download a file on the remote system to your local machine.
      /// </summary>
      public void DownloadFile()
      {
          string host           = "";
          string username       = "";
          string password       = "";
          string localFileName  = System.IO.Path.GetFileName(localFile);
          string remoteFileName = "";
      
          using (var sftp = new SftpClient(host, username, password))
          {
              sftp.Connect();
      
              using (var file = File.OpenWrite(localFileName))
              {
                  sftp.DownloadFile(remoteFileName, file);
              }
      
              sftp.Disconnect();
          }
      }
      

      <强> -------------------------------------------- -------------

      2)另一个替代库是WinSCP

      <强> -------------------------------------------- -------------

      以下为例:

      using System;
      using WinSCP;
      
      class Example
      {
          public static int Main()
          {
              try
              {
                  // Setup session options
                  SessionOptions sessionOptions = new SessionOptions
                  {
                      Protocol = Protocol.Sftp,
                      HostName = "example.com",
                      UserName = "user",
                      Password = "mypassword",
                      SshHostKeyFingerprint = "ssh-rsa 2048 xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx"
                  };
      
                  using (Session session = new Session())
                  {
                      // Connect
                      session.Open(sessionOptions);
      
                      // Upload files
                      TransferOptions transferOptions = new TransferOptions();
                      transferOptions.TransferMode = TransferMode.Binary;
      
                      TransferOperationResult transferResult;
                      transferResult = session.PutFiles(@"d:\toupload\*", "/home/user/", false, transferOptions);
      
                      // Throw on any error
                      transferResult.Check();
      
                      // Print results
                      foreach (TransferEventArgs transfer in transferResult.Transfers)
                      {
                          Console.WriteLine("Upload of {0} succeeded", transfer.FileName);
                      }
                  }
      
                  return 0;
              }
              catch (Exception e)
              {
                  Console.WriteLine("Error: {0}", e);
                  return 1;
              }
          }
      }
      

      Found heremore here

答案 1 :(得分:6)

FTP可以单独使用.NET完成。但是SFTP没有内置类。我建议你看一下WinSCP

答案 2 :(得分:4)

同意Tejs。只是为了澄清:

带有EnableSsl = true的FtpWebRequest意味着它是ftps,显式模式或Filezilla措辞:“FTPES - FTP over Explicit TLS / SSL,默认端口21”。您可以使用内置的.net内容来完成此操作。

对于隐式ftps(在Filezilla措辞“FTPS - 基于隐式TLS / SSL的FTP,默认端口990”),您必须使用第三方(例如ftps.codeplex.com)。

对于sftp(在Filezilla中写“SSH文件传输协议,默认端口22”),您还必须使用第三方(例如sshnet.codeplex.com)。

正如Joachim Isaksson所说,如果你不能使用第三方,你必须自己实施。