FTP open host process

最新推荐文章于 2024-04-14 09:45:58 发布
最新推荐文章于 2024-04-14 09:45:58 发布
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分类专栏： Network Programming and Protocols 文章标签： dst internet cisco file c tcp
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本文链接：https://blog.youkuaiyun.com/RichardYSteven/article/details/6179372
本文通过Wireshark抓包详细记录并解析了FTP登录过程中的网络交互细节，包括三次握手、服务器标识、匿名登录认证及后续命令交互等步骤。

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下面是一个用wireshark抓的 ， ftp open时候的过程。

 

 客户端和服务器端的端口都没有变化，服务器用的是21端口 。

 

1. 三次握手

No.     Time        Source                Destination           Protocol Info
      1 0.000000    10.74.52.92           10.77.21.166          TCP      34756 > ftp [SYN] Seq=0 Win=5840 Len=0 MSS=1460 SACK_PERM=1 TSV=555948430 TSER=0 WS=7

Frame 1: 74 bytes on wire (592 bits), 74 bytes captured (592 bits)
Ethernet II, Src: Tp-LinkT_2c:b6:ef (00:19:e0:2c:b6:ef), Dst: Cisco_52:62:08 (00:19:55:52:62:08)
Internet Protocol, Src: 10.74.52.92 (10.74.52.92), Dst: 10.77.21.166 (10.77.21.166)
Transmission Control Protocol, Src Port: 34756 (34756), Dst Port: ftp (21), Seq: 0, Len: 0

No.     Time        Source                Destination           Protocol Info
      2 0.105200    10.77.21.166          10.74.52.92           TCP      ftp > 34756 [SYN, ACK] Seq=0 Ack=1 Win=64512 Len=0 MSS=1330 WS=0 TSV=0 TSER=0 SACK_PERM=1

Frame 2: 78 bytes on wire (624 bits), 78 bytes captured (624 bits)
Ethernet II, Src: Cisco_2c:6a:80 (00:18:74:2c:6a:80), Dst: Tp-LinkT_2c:b6:ef (00:19:e0:2c:b6:ef)
Internet Protocol, Src: 10.77.21.166 (10.77.21.166), Dst: 10.74.52.92 (10.74.52.92)
Transmission Control Protocol, Src Port: ftp (21), Dst Port: 34756 (34756), Seq: 0, Ack: 1, Len: 0

No.     Time        Source                Destination           Protocol Info
      3 0.105244    10.74.52.92           10.77.21.166          TCP      34756 > ftp [ACK] Seq=1 Ack=1 Win=5888 Len=0 TSV=555948456 TSER=0

Frame 3: 66 bytes on wire (528 bits), 66 bytes captured (528 bits)
Ethernet II, Src: Tp-LinkT_2c:b6:ef (00:19:e0:2c:b6:ef), Dst: Cisco_52:62:08 (00:19:55:52:62:08)
Internet Protocol, Src: 10.74.52.92 (10.74.52.92), Dst: 10.77.21.166 (10.77.21.166)
Transmission Control Protocol, Src Port: 34756 (34756), Dst Port: ftp (21), Seq: 1, Ack: 1, Len: 0

 

2. 服务器发来自己的标识

No.     Time        Source                Destination           Protocol Info
      4 0.208322    10.77.21.166          10.74.52.92           FTP      Response: 220 Microsoft FTP Service

Frame 4: 93 bytes on wire (744 bits), 93 bytes captured (744 bits)
Ethernet II, Src: Cisco_2c:6a:80 (00:18:74:2c:6a:80), Dst: Tp-LinkT_2c:b6:ef (00:19:e0:2c:b6:ef)
Internet Protocol, Src: 10.77.21.166 (10.77.21.166), Dst: 10.74.52.92 (10.74.52.92)
Transmission Control Protocol, Src Port: ftp (21), Dst Port: 34756 (34756), Seq: 1, Ack: 1, Len: 27
File Transfer Protocol (FTP)

No.     Time        Source                Destination           Protocol Info
      5 0.208365    10.74.52.92           10.77.21.166          TCP      34756 > ftp [ACK] Seq=1 Ack=28 Win=5888 Len=0 TSV=555948482 TSER=14500999

Frame 5: 66 bytes on wire (528 bits), 66 bytes captured (528 bits)
Ethernet II, Src: Tp-LinkT_2c:b6:ef (00:19:e0:2c:b6:ef), Dst: Cisco_52:62:08 (00:19:55:52:62:08)
Internet Protocol, Src: 10.74.52.92 (10.74.52.92), Dst: 10.77.21.166 (10.77.21.166)
Transmission Control Protocol, Src Port: 34756 (34756), Dst Port: ftp (21), Seq: 1, Ack: 28, Len: 0

 

3. 客户端发送登录的用户名，这次用的是匿名登录

No.     Time        Source                Destination           Protocol Info
      6 17125.849301 10.74.52.92           10.77.21.166          FTP      Request: USER anonymous

Frame 6: 82 bytes on wire (656 bits), 82 bytes captured (656 bits)
Ethernet II, Src: Tp-LinkT_2c:b6:ef (00:19:e0:2c:b6:ef), Dst: Cisco_52:62:08 (00:19:55:52:62:08)
Internet Protocol, Src: 10.74.52.92 (10.74.52.92), Dst: 10.77.21.166 (10.77.21.166)
Transmission Control Protocol, Src Port: 34756 (34756), Dst Port: ftp (21), Seq: 1, Ack: 28, Len: 16
File Transfer Protocol (FTP)

No.     Time        Source                Destination           Protocol Info
      7 17125.952716 10.77.21.166          10.74.52.92           FTP      Response: 331 Anonymous access allowed, send identity (e-mail name) as password.

Frame 7: 138 bytes on wire (1104 bits), 138 bytes captured (1104 bits)
Ethernet II, Src: Cisco_2c:6a:80 (00:18:74:2c:6a:80), Dst: Tp-LinkT_2c:b6:ef (00:19:e0:2c:b6:ef)
Internet Protocol, Src: 10.77.21.166 (10.77.21.166), Dst: 10.74.52.92 (10.74.52.92)
Transmission Control Protocol, Src Port: ftp (21), Dst Port: 34756 (34756), Seq: 28, Ack: 17, Len: 72
File Transfer Protocol (FTP)

No.     Time        Source                Destination           Protocol Info
      8 17125.952760 10.74.52.92           10.77.21.166          TCP      34756 > ftp [ACK] Seq=17 Ack=100 Win=5888 Len=0 TSV=560206650 TSER=14672252

Frame 8: 66 bytes on wire (528 bits), 66 bytes captured (528 bits)
Ethernet II, Src: Tp-LinkT_2c:b6:ef (00:19:e0:2c:b6:ef), Dst: Cisco_52:62:08 (00:19:55:52:62:08)
Internet Protocol, Src: 10.74.52.92 (10.74.52.92), Dst: 10.77.21.166 (10.77.21.166)
Transmission Control Protocol, Src Port: 34756 (34756), Dst Port: ftp (21), Seq: 17, Ack: 100, Len: 0

 

4. 发送匿名用户的密码， 貌似是明文？

No.     Time        Source                Destination           Protocol Info
      9 17560.816985 10.74.52.92           10.77.21.166          FTP      Request: PASS NcFTP@

Frame 9: 79 bytes on wire (632 bits), 79 bytes captured (632 bits)
Ethernet II, Src: Tp-LinkT_2c:b6:ef (00:19:e0:2c:b6:ef), Dst: Cisco_52:62:08 (00:19:55:52:62:08)
Internet Protocol, Src: 10.74.52.92 (10.74.52.92), Dst: 10.77.21.166 (10.77.21.166)
Transmission Control Protocol, Src Port: 34756 (34756), Dst Port: ftp (21), Seq: 17, Ack: 100, Len: 13
File Transfer Protocol (FTP)

No.     Time        Source                Destination           Protocol Info
     10 17560.928850 10.77.21.166          10.74.52.92           FTP      Response: 230 Anonymous user logged in.

Frame 10: 97 bytes on wire (776 bits), 97 bytes captured (776 bits)
Ethernet II, Src: Cisco_2c:6a:80 (00:18:74:2c:6a:80), Dst: Tp-LinkT_2c:b6:ef (00:19:e0:2c:b6:ef)
Internet Protocol, Src: 10.77.21.166 (10.77.21.166), Dst: 10.74.52.92 (10.74.52.92)
Transmission Control Protocol, Src Port: ftp (21), Dst Port: 34756 (34756), Seq: 100, Ack: 30, Len: 31
File Transfer Protocol (FTP)

No.     Time        Source                Destination           Protocol Info
     11 17560.928894 10.74.52.92           10.77.21.166          TCP      34756 > ftp [ACK] Seq=30 Ack=131 Win=5888 Len=0 TSV=560314781 TSER=14676602

Frame 11: 66 bytes on wire (528 bits), 66 bytes captured (528 bits)
Ethernet II, Src: Tp-LinkT_2c:b6:ef (00:19:e0:2c:b6:ef), Dst: Cisco_52:62:08 (00:19:55:52:62:08)
Internet Protocol, Src: 10.74.52.92 (10.74.52.92), Dst: 10.77.21.166 (10.77.21.166)
Transmission Control Protocol, Src Port: 34756 (34756), Dst Port: ftp (21), Seq: 30, Ack: 131, Len: 0

 

5.请求当前的路径

No.     Time        Source                Destination           Protocol Info
     12 17810.419089 10.74.52.92           10.77.21.166          FTP      Request: PWD

Frame 12: 71 bytes on wire (568 bits), 71 bytes captured (568 bits)
Ethernet II, Src: Tp-LinkT_2c:b6:ef (00:19:e0:2c:b6:ef), Dst: Cisco_52:62:08 (00:19:55:52:62:08)
Internet Protocol, Src: 10.74.52.92 (10.74.52.92), Dst: 10.77.21.166 (10.77.21.166)
Transmission Control Protocol, Src Port: 34756 (34756), Dst Port: ftp (21), Seq: 30, Ack: 131, Len: 5
File Transfer Protocol (FTP)

No.     Time        Source                Destination           Protocol Info
     13 17810.521822 10.77.21.166          10.74.52.92           FTP      Response: 257 "/" is current directory.

Frame 13: 97 bytes on wire (776 bits), 97 bytes captured (776 bits)
Ethernet II, Src: Cisco_2c:6a:80 (00:18:74:2c:6a:80), Dst: Tp-LinkT_2c:b6:ef (00:19:e0:2c:b6:ef)
Internet Protocol, Src: 10.77.21.166 (10.77.21.166), Dst: 10.74.52.92 (10.74.52.92)
Transmission Control Protocol, Src Port: ftp (21), Dst Port: 34756 (34756), Seq: 131, Ack: 35, Len: 31
File Transfer Protocol (FTP)

No.     Time        Source                Destination           Protocol Info
     14 17810.521862 10.74.52.92           10.77.21.166          TCP      34756 > ftp [ACK] Seq=35 Ack=162 Win=5888 Len=0 TSV=560376825 TSER=14679098

Frame 14: 66 bytes on wire (528 bits), 66 bytes captured (528 bits)
Ethernet II, Src: Tp-LinkT_2c:b6:ef (00:19:e0:2c:b6:ef), Dst: Cisco_52:62:08 (00:19:55:52:62:08)
Internet Protocol, Src: 10.74.52.92 (10.74.52.92), Dst: 10.77.21.166 (10.77.21.166)
Transmission Control Protocol, Src Port: 34756 (34756), Dst Port: ftp (21), Seq: 35, Ack: 162, Len: 0

 

6. 请求feature，貌似服务器不支持

No.     Time        Source                Destination           Protocol Info
     15 18651.095674 10.74.52.92           10.77.21.166          FTP      Request: FEAT

Frame 15: 72 bytes on wire (576 bits), 72 bytes captured (576 bits)
Ethernet II, Src: Tp-LinkT_2c:b6:ef (00:19:e0:2c:b6:ef), Dst: Cisco_52:62:08 (00:19:55:52:62:08)
Internet Protocol, Src: 10.74.52.92 (10.74.52.92), Dst: 10.77.21.166 (10.77.21.166)
Transmission Control Protocol, Src Port: 34756 (34756), Dst Port: ftp (21), Seq: 35, Ack: 162, Len: 6
File Transfer Protocol (FTP)

No.     Time        Source                Destination           Protocol Info
     16 18651.198840 10.77.21.166          10.74.52.92           FTP      Response: 500 'FEAT': command not understood

Frame 16: 102 bytes on wire (816 bits), 102 bytes captured (816 bits)
Ethernet II, Src: Cisco_2c:6a:80 (00:18:74:2c:6a:80), Dst: Tp-LinkT_2c:b6:ef (00:19:e0:2c:b6:ef)
Internet Protocol, Src: 10.77.21.166 (10.77.21.166), Dst: 10.74.52.92 (10.74.52.92)
Transmission Control Protocol, Src Port: ftp (21), Dst Port: 34756 (34756), Seq: 162, Ack: 41, Len: 36
File Transfer Protocol (FTP)

No.     Time        Source                Destination           Protocol Info
     17 18651.198891 10.74.52.92           10.77.21.166          TCP      34756 > ftp [ACK] Seq=41 Ack=198 Win=5888 Len=0 TSV=560585832 TSER=14687505

Frame 17: 66 bytes on wire (528 bits), 66 bytes captured (528 bits)
Ethernet II, Src: Tp-LinkT_2c:b6:ef (00:19:e0:2c:b6:ef), Dst: Cisco_52:62:08 (00:19:55:52:62:08)
Internet Protocol, Src: 10.74.52.92 (10.74.52.92), Dst: 10.77.21.166 (10.77.21.166)
Transmission Control Protocol, Src Port: 34756 (34756), Dst Port: ftp (21), Seq: 41, Ack: 198, Len: 0

 

7. 不知道这是啥命令

No.     Time        Source                Destination           Protocol Info
     18 18888.285635 10.74.52.92           10.77.21.166          FTP      Request: HELP SITE

Frame 18: 77 bytes on wire (616 bits), 77 bytes captured (616 bits)
Ethernet II, Src: Tp-LinkT_2c:b6:ef (00:19:e0:2c:b6:ef), Dst: Cisco_52:62:08 (00:19:55:52:62:08)
Internet Protocol, Src: 10.74.52.92 (10.74.52.92), Dst: 10.77.21.166 (10.77.21.166)
Transmission Control Protocol, Src Port: 34756 (34756), Dst Port: ftp (21), Seq: 41, Ack: 198, Len: 11
File Transfer Protocol (FTP)

No.     Time        Source                Destination           Protocol Info
     19 18888.392638 10.77.21.166          10.74.52.92           FTP      Response: 214 Syntax: SITE (site-specific commands)

Frame 19: 109 bytes on wire (872 bits), 109 bytes captured (872 bits)
Ethernet II, Src: Cisco_2c:6a:80 (00:18:74:2c:6a:80), Dst: Tp-LinkT_2c:b6:ef (00:19:e0:2c:b6:ef)
Internet Protocol, Src: 10.77.21.166 (10.77.21.166), Dst: 10.74.52.92 (10.74.52.92)
Transmission Control Protocol, Src Port: ftp (21), Dst Port: 34756 (34756), Seq: 198, Ack: 52, Len: 43
File Transfer Protocol (FTP)

No.     Time        Source                Destination           Protocol Info
     20 18888.392677 10.74.52.92           10.77.21.166          TCP      34756 > ftp [ACK] Seq=52 Ack=241 Win=5888 Len=0 TSV=560644797 TSER=14689876

Frame 20: 66 bytes on wire (528 bits), 66 bytes captured (528 bits)
Ethernet II, Src: Tp-LinkT_2c:b6:ef (00:19:e0:2c:b6:ef), Dst: Cisco_52:62:08 (00:19:55:52:62:08)
Internet Protocol, Src: 10.74.52.92 (10.74.52.92), Dst: 10.77.21.166 (10.77.21.166)
Transmission Control Protocol, Src Port: 34756 (34756), Dst Port: ftp (21), Seq: 52, Ack: 241, Len: 0

 

8. 同样不知道这是啥命令

No.     Time        Source                Destination           Protocol Info
     21 19426.362670 10.74.52.92           10.77.21.166          FTP      Request: CLNT NcFTP 3.2.4 linux-x86-glibc2.6

Frame 21: 103 bytes on wire (824 bits), 103 bytes captured (824 bits)
Ethernet II, Src: Tp-LinkT_2c:b6:ef (00:19:e0:2c:b6:ef), Dst: Cisco_52:62:08 (00:19:55:52:62:08)
Internet Protocol, Src: 10.74.52.92 (10.74.52.92), Dst: 10.77.21.166 (10.77.21.166)
Transmission Control Protocol, Src Port: 34756 (34756), Dst Port: ftp (21), Seq: 52, Ack: 241, Len: 37
File Transfer Protocol (FTP)

No.     Time        Source                Destination           Protocol Info
     22 19426.465881 10.77.21.166          10.74.52.92           FTP      Response: 500 'CLNT NcFTP 3.2.4 linux-x86-glibc2.6': command not understood

Frame 22: 133 bytes on wire (1064 bits), 133 bytes captured (1064 bits)
Ethernet II, Src: Cisco_2c:6a:80 (00:18:74:2c:6a:80), Dst: Tp-LinkT_2c:b6:ef (00:19:e0:2c:b6:ef)
Internet Protocol, Src: 10.77.21.166 (10.77.21.166), Dst: 10.74.52.92 (10.74.52.92)
Transmission Control Protocol, Src Port: ftp (21), Dst Port: 34756 (34756), Seq: 241, Ack: 89, Len: 67
File Transfer Protocol (FTP)

No.     Time        Source                Destination           Protocol Info
     23 19426.465939 10.74.52.92           10.77.21.166          TCP      34756 > ftp [ACK] Seq=89 Ack=308 Win=5888 Len=0 TSV=560778555 TSER=14695257

Frame 23: 66 bytes on wire (528 bits), 66 bytes captured (528 bits)
Ethernet II, Src: Tp-LinkT_2c:b6:ef (00:19:e0:2c:b6:ef), Dst: Cisco_52:62:08 (00:19:55:52:62:08)
Internet Protocol, Src: 10.74.52.92 (10.74.52.92), Dst: 10.77.21.166 (10.77.21.166)
Transmission Control Protocol, Src Port: 34756 (34756), Dst Port: ftp (21), Seq: 89, Ack: 308, Len: 0

 

ok，整个过程结束，算是登录成功了。

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安全的FTP传输 Imports Org.Mentalis.Security.Ssl Imports Org.Mentalis.Security.Certificates Imports Org.Mentalis.Security.Cryptography Imports System Imports System.IO Imports System.Exception 'Imports Tamir.SharpSsh.java 'Imports Tamir.SharpSsh Imports SharpSSH_EXD Public Class SFTPHelper Private Sub New() End Sub Private m_sshCp As SshTransferProtocolBase Public ReadOnly Property Connected() As Boolean Get Return m_sshCp.Connected End Get End Property Public Sub New(ByVal connectionInfo As SshConnectionInfo) m_sshCp = New Sftp(connectionInfo.Host, connectionInfo.User) If (Not connectionInfo.Pass Is Nothing) Then m_sshCp.Password = connectionInfo.Pass End If If Not connectionInfo.IdentityFile Is Nothing Then m_sshCp.AddIdentityFile(connectionInfo.IdentityFile) End If End Sub Public Sub Connect() If (m_sshCp.Connected = False) Then Try m_sshCp.Connect(10022) ' m_sshCp.Connect() ' Dim i As Integer = m_sshCp.Port Catch ex As System.Exception ' Dim str As String = ex.ToString ' Dim a As Integer = 0 m_sshCp.Close() End Try End If End Sub Public Sub Close() If (m_sshCp.Connected) Then m_sshCp.Close() End If End Sub Public Function Upload(ByVal localPath As String, ByVal remotePath As String) As String Try If (m_sshCp.Connected = False) Then m_sshCp.Connect(10022) End If Try m_sshCp.Put_resume(localPath, remotePath) 'm_sshCp.RemoveFile(remotePath) ' Return "Remote File has already exists. delete file" Catch ex As Tamir.SharpSsh.jsch.SftpException m_sshCp.RemoveFile(remotePath) Return "Remote File has already exists. delete file" End Try Return "" Catch ex As Exception Return ex.Message End Try End Function Public Function Download(ByVal remotePath As String, ByVal localPath As String) As Boolean Try If (m_sshCp.Connected = False) Then m_sshCp.Connect(10022) End If m_sshCp.Get(remotePath, localPath) Return True Catch Return False End Try End Function Public Function CheckFileLength(ByVal filePath As String) As Long Try 'Dim stream As New Tamir.SharpSsh.SshStream(filePath.Replace(".TMP", ".TXT"), m_sshCp.Username, m_sshCp.Password) 'Return stream.Length If (m_sshCp.Connected = False) Then m_sshCp.Connect(10022) End If Return m_sshCp.GetFileLength(filePath) Catch ex As Exception Dim str As String = ex.ToString End Try Return 0 End Function Public Sub SetFileLength(ByVal filePath As String) 'set 0 Try 'Dim stream As New Tamir.SharpSsh.SshStream(filePath.Replace(".TMP", ".TXT"), m_sshCp.Username, m_sshCp.Password) 'Return stream.Length If (m_sshCp.Connected = False) Then m_sshCp.Connect(10022) End If m_sshCp.SetFileLength(filePath) Catch ex As Exception Dim str As String = ex.ToString End Try End Sub Public Function RenameFile(ByVal oldPath As String, ByVal newPath As String) As Boolean Dim blnResult As Boolean = False Try If (m_sshCp.Connected = False) Then m_sshCp.Connect(10022) End If m_sshCp.RenameFile(oldPath, newPath) blnResult = True Catch ex As Exception blnResult = False End Try Return blnResult End Function End Class Public Class SshConnectionInfo Private _user As String Private _pass As String Private _host As String Private _identityFile As String Public Property User() As String Get Return _user End Get Set(ByVal value As String) _user = value End Set End Property Public Property Pass() As String Get Return _pass End Get Set(ByVal value As String) _pass = value End Set End Property Public Property Host() As String Get Return _host End Get Set(ByVal value As String) _host = value End Set End Property Public Property IdentityFile() As String Get Return _identityFile End Get Set(ByVal value As String) _identityFile = value End Set End Property End Class
OpenFTPClient Final Edition
03-21
这个是OpenFTP客户端的1.1的最终版本。使用Java编写。IDE：eclipse OS：Windows7 这个版本修改了beta版本的延迟现象。
OpenFTPServer服务器程序源代码
03-15
这个是服务器的源代码。有完整的界面，可以更换皮肤。支持PORT和PASV模式。完全公开的代码。。。
OpenFTPClient1.1发布
JINXINXIN_BEAR_OS的专栏
03-05 676
本FTP客户端版本1.1发布。     2010-3-5本FTP客户端版本1.0为命令行，被集成到1.1版本中。欢迎联系我：获取源码和应用程序。 Email：xinxinli1234@sina.com 
lftp
被水煮的魚
06-15 9884
一直想找一个在linux里能与FlashFXP比肩的ftp客户端，试过了若干种GUI的ftp client，有free的也有non-free的，但实际用过得同志应该清楚，说它们是lj，恐怕伤了作者的心，但又实在找不出其他形容。转了一圈又回到lftp，没有GUI，对于初学者来说，虽然有一点点痛苦，但只要想想，lftp能在众多client中屹立不倒这么多年，而且至今仍然是linux 里最首推崇的利器，
ftp的open命令打不开 未知主机_好用的parallel命令
weixin_29531897的博客
12-27 1601
原创：打码日记(微信公众号ID：codelogs)，欢迎分享，转载请保留出处。简介有时，我们需要处理一批数据，使用while循环是个不错的想法，但while循环中的命令是一个一个执行的，如果要批量处理的数据很多，执行时间就会很长，而parallel可以让命令并行执行，从而缩短命令执行时间。下面，我们先用ncat来模拟一个处理数据的接口。模拟接口ncat-lk8088-c'slee...
window ftp open命令打不开_Centos7上搭建ftp
weixin_39628256的博客
01-20 572
第一步：使用xshell连上远程服务器，安装vsftpyum install -y vsftpd第二步：设置开机启动systemctl enable vsftpd第三步：启动ftp服务systemctl start vsftpd.service第四步：打开防火墙firewall-cmd --zone=public --add-port=21/tcp --permanentfirewall-cmd ...
OpenEluer搭建FTP服务器
weixin_59842401的博客
02-16 1662
FTP（File Transfer Protocol）是一种用于在计算机之间传输文件的标准网络协议。FTP协议在TCP/IP协议族中属于应用层协议，通过它可以将文件从一台计算机传输到另一台计算机。FTP协议提供了两种工作模式：标准模式和被动模式。在标准模式下，客户端通过控制连接建立与服务器的连接，并通过数据连接进行数据传输。在被动模式下，客户端发出PASV命令，服务器返回一个端口号，客户端通过端口号与服务器建立数据连接，进行数据传输。FTP协议通常用于网站维护、文件共享和软件下载等方面。
too many files open ftp（并发下载坑） 记录一次宕机
m0_58326167的博客
01-17 3144
1、问题排查（如果没有什么相关工具可用，就比如我不知道用什么插件来排查，这就需要对业务了解） 查看某个进程下打开文件数量，虽可以设置文件打开数量，但不治本。 是因为并发太多的原因吗，修改核心线程数减少一半10改为3 发现并没有解决，再次宕机 继续排查发现这个进程打开的文件数达到3000后宕机（已经确定和ftp下载有关） 打开代码 测试下载方法 发现下载速度超快（万兆网）300张图片300M时间 2021-12-19 00:07:06.155 [schedule-pool-3] I
C#程序中调用WinSCP实现FTP文件管理与SFTP连接
psi.Arguments = "/command \"open ftp://username:password@ftpserver/ -hostkey=""ssh-rsa <key>"" \"ls\" \"exit\""; psi.UseShellExecute = false; psi.RedirectStandardOutput = true; psi....
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