使用FtpWebRequest输出日志

Question

我想知道是否可以使用FtpWebRequest为我的FTP客户端提供输出日志。

如下所示：

[R] USER xxx
[R] 331 Please specify the password.
[R] PASS (hidden)
[R] 230 Login successful.
[R] SYST
[R] 215 UNIX Type: L8
[R] FEAT
[R] 211-Features:
[R]  EPRT
[R]  EPSV
[R]  MDTM
[R]  PASV
[R]  REST STREAM
[R]  SIZE
[R]  TVFS
[R] 211 End
[R] PWD
[R] 257 "/"
[R] CWD /
[R] 250 Directory successfully changed.
[R] PWD
[R] 257 "/"
[R] TYPE A
[R] 200 Switching to ASCII mode.
[R] PASV
[R] 227 Entering Passive Mode (10,232,201,81,141,175)
[R] Opening data connection IP: 10.232.201.81 PORT: 36271
[R] LIST -al
[R] 150 Here comes the directory listing.
[R] 226 Directory send OK.

例如，此输出是在连接时...

我当前的代码只执行以下操作：

// Get the object used to communicate with the server.
FtpWebRequest request = (FtpWebRequest)WebRequest.Create(string.Format("ftp://{0}", addrEndPoint));
request.Method = WebRequestMethods.Ftp.ListDirectoryDetails;
request.Credentials = new NetworkCredential(_currentConnection.Username, _currentConnection.Password);

FtpWebResponse response = (FtpWebResponse)request.GetResponse();

Stream responseStream = response.GetResponseStream();
StreamReader readStream = new StreamReader(responseStream, System.Text.Encoding.UTF8);

if (readStream != null)
{
    Console.WriteLine(readStream.ReadToEnd());
}

Answer 1

您可以使用Network Tracing来完成此操作。要set it up，请创建(或修改，如果您已经有一个) App.config文件，使其如下所示(如果您已经有该文件，则需要向其中添加设置)：

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <system.diagnostics>
    <sources>
      <source name="System.Net" tracemode="protocolonly" maxdatasize="1024">
        <listeners>
          <add name="System.Net"/>
        </listeners>
      </source>
    </sources>
    <switches>
      <add name="System.Net" value="Information"/>
    </switches>
    <sharedListeners>
      <add name="System.Net"
        type="System.Diagnostics.TextWriterTraceListener"
        initializeData="network.log"
      />
    </sharedListeners>
    <trace autoflush="true"/>
  </system.diagnostics>
</configuration>

如果这样做，您的应用程序将创建一个network.log文件，该文件可能如下所示：

System.Net Information: 1 : [8892] FtpWebRequest#2383799::.ctor(ftp://test/)
System.Net Information: 0 : [8892] FtpWebRequest#2383799::GetResponse(Method=LIST.)
System.Net Information: 0 : [8892] Current OS installation type is 'Client'.
System.Net Information: 0 : [8892] RAS supported: True
System.Net Information: 0 : [8892] FtpControlStream#33675143 - Created connection from 192.168.1.1:51833 to 192.168.1.2:21.
System.Net Information: 0 : [8892] Associating FtpWebRequest#2383799 with FtpControlStream#33675143
System.Net Information: 0 : [8892] FtpControlStream#33675143 - Received response [220 This is the test FTP server. Authentication required.]
System.Net Information: 0 : [8892] FtpControlStream#33675143 - Sending command [USER svick]
System.Net Information: 0 : [8892] FtpControlStream#33675143 - Received response [331 Password required for svick]
System.Net Information: 0 : [8892] FtpControlStream#33675143 - Sending command [PASS ********]
System.Net Information: 0 : [8892] FtpControlStream#33675143 - Received response [230 Logged on]
System.Net Information: 0 : [8892] FtpControlStream#33675143 - Sending command [OPTS utf8 on]
System.Net Information: 0 : [8892] FtpControlStream#33675143 - Received response [200 UTF8 mode enabled]
System.Net Information: 0 : [8892] FtpControlStream#33675143 - Sending command [PWD]
System.Net Information: 0 : [8892] FtpControlStream#33675143 - Received response [257 "/" is current directory.]
System.Net Information: 0 : [8892] FtpControlStream#33675143 - Sending command [TYPE I]
System.Net Information: 0 : [8892] FtpControlStream#33675143 - Received response [200 Type set to I]
System.Net Information: 0 : [8892] FtpControlStream#33675143 - Sending command [PASV]
System.Net Information: 0 : [8892] FtpControlStream#33675143 - Received response [227 Entering Passive Mode (174,37,88,92,117,98)]
System.Net Information: 0 : [8892] FtpControlStream#33675143 - Sending command [LIST]
System.Net Information: 0 : [8892] FtpControlStream#33675143 - Received response [150 Connection accepted]
System.Net Information: 0 : [8892] FtpControlStream#33675143 - Received response [226 Transfer OK]
System.Net Information: 0 : [8892] FtpWebRequest#2383799::(Releasing FTP connection#33675143.)

它相当冗长，但它确实包含了您需要的信息。如果您想修改日志文件的写入方式，您可以实现自己的TraceListener并在配置文件中使用它，而不是TextWriterTraceListener。

Answer 2

请查看以下链接以供参考。如果你有IIS7，那么就有可能实现你自己的功能。

implementing IFtpLogProvider interface's Log method

using System;
using System.IO;
using Microsoft.Web.FtpServer;
using System.Diagnostics;
using System.Diagnostics.Eventing;

namespace FtpLogging
{
    public class FtpLogDemo : BaseProvider,
        IFtpLogProvider
    {
        void IFtpLogProvider.Log(FtpLogEntry loggingParameters)
        {
         .......

参考：

IIS FTP 7.5 Extensibility (IFtpLogProvider and logging FTP failures to the event log)

Problem writing to a file (C#)