Android Question FTP error

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NikB4x

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• Feb 17, 2021

• #2

Hi,
This means that the server you are using supports only crypted (SSL/TLS) connection.
Usually you can set if it have to support plain text. What server are you using?

 

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NikB4x

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• Feb 17, 2021

• #3

If you can't change the plain text setting try this:

B4x:

Dim ftp As FTP
dim ctm As CustomTrustManager
ctm.InitializeAcceptAll
ftp.Initialize("FTP", "IP", 21, USER", "PASSWORD")
ftp.PassiveMode = True
FTP.UseSSL = True
FTP.UseSSLExplicit = True
FTP.SetCustomSSLTrustManager(ctm)
If ftp.IsInitialized=True Then
       Log("OK FTP!") '
End If

ftp.UploadFile (File.DirRootExternal, "Camera.png", False, "/Camera.png")

 

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Erel

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• Feb 18, 2021

• #4

Worth reading: https://www.b4x.com/glossary/ftp/

1. No need to check whether ftp.IsInitialized. It will always be after you called Initialize.

2. UseSSL and UseSSLExplicit are exclusive. Only set UseSSLExplicit to True.

3. It is a mistake to post code with CustomTrustManager without explaining what it does. It has security implications. Start without it. It is only needed if you are connecting to a server with a self signed certificate.

 

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N

NikB4x

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• Feb 18, 2021

• #5

Erel said:

Worth reading: https://www.b4x.com/glossary/ftp/

1. No need to check whether ftp.IsInitialized. It will always be after you called Initialize.

2. UseSSL and UseSSLExplicit are exclusive. Only set UseSSLExplicit to True.

3. It is a mistake to post code with CustomTrustManager without explaining what it does. It has security implications. Start without it. It is only needed if you are connecting to a server with a self signed certificate.

Click to expand...

Hi Erel you are right, as he is sending camera's pictures to the ftp server, I assumed that he was using an internal server with self signed certificate, but it's not sure and in any case someone else can use the same code for other scope.
So, use ctm.InitializeAcceptAll only if the server hasn't a valid certificate and you know that it's a reliable server.

 

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roberto64

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• Feb 18, 2021

• #6

Thanks for your reply, but the error persists "android.system.ErrnoException: open failed: ENOENT (No such file or directory)", I don't understand why it tells me that it doesn't find any files or directories.
thank you

 

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N

NikB4x

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• Feb 18, 2021

• #7

This is another kind of error... check if user home dir is correct. What ftp server are you using? Is it under Windows, Linux or other OS?

 

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roberto64

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• Feb 18, 2021

• #8

the linux ftp server, the program I am using for ftp Filezilla, and the mi directory of which is "/"
thank you

 

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DonManfred

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• Feb 18, 2021

• #9

Nicola Ciaramellano said:

File.DirRootExternal

Click to expand...

maybe related to this path. Are you using RUNTIMEPERMISSIONS? If not; DO IT. It is mandatory to use RTP on higher Androids....

 

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roberto64

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• Feb 18, 2021

• #10

Yes,

FTP:

#If B4A
    Dim rp As RuntimePermissions
    'PERMISSION_ACCESS_FINE_LOCATION -------------------------------------
    rp.CheckAndRequest(rp.PERMISSION_WRITE_EXTERNAL_STORAGE)
    rp.CheckAndRequest(rp.PERMISSION_READ_EXTERNAL_STORAGE)
    Wait For B4XPage_PermissionResult (Permission As String, Result As Boolean)
        If Result = False Then
        MsgboxAsync("Autorizzazione non autorizzzate", "Attenzione...")
        Return
    End If
    #End If

 

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N

NikB4x

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• Feb 18, 2021

• #11

roberto64 said:

the linux ftp server, the program I am using for ftp Filezilla, and the mi directory of which is "/"
thank you

Click to expand...

So, if I understood,are you using Filezilla server on Linux using WineHQ or something similar? Because I think that Filezilla server isn't native under linux.
In any case the error you are experiencing with, is related to a wrong setting of the user's directory server side.
Could you try to use filezilla as client (also locally) with same user and password for checking if the error is the same? In this way you can check if the problem is server side or client side.
Recently I had the similar problem with vsftpd under linux and the reported error was the same, but the home directory was correctly set and I solved it changing the control port with another than 21. Apparently it had nothing to do with it and with netstat I saw that none was using the 21 port, but It worked.

 

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roberto64

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• Feb 18, 2021

• #12

No, I'm using Filezilla under windows as a client to connect to the Linux server, I have a third party host / server, its host or server directory and "/" so I don't understand why it can't find the directory or file to upload and save it on my smartphone. Thank you for your time

 

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N

NikB4x

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• Feb 18, 2021

• #13

Have you tried to remove "/"?

ftp.UploadFile (File.DirRootExternal, "Camera.png", False, "Camera.png")

 

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roberto64

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• Feb 18, 2021

• #14

I'll try later and let you know thanks

 

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roberto64

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• Feb 18, 2021

• #15

nothing, as you told me does not work, do you have any example?
thank you

 

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N

NikB4x

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• Feb 18, 2021

• #16

Try to connect here (my test server):

18.219.204.146

user: userftp
pass: userftp

Let me know if it works.

 

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NikB4x

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• Feb 18, 2021

• #17

This works for me.

 

Attachments

• TestFtp.zip

  21.2 KB · Views: 215

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udg

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• Feb 18, 2021

• #18

Could it be that your hosting provider doesn't like "/" (root) as the folder on your presumably shared server?
Anyway I find your post #12 a bit confusing; are you uploading from device to server or downloading from server to your device?

"..I have a third party host / server, its host or server directory and "/" so I don't understand why it can't find the directory or file to upload and save it on my smartphone. "

 

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roberto64

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• Feb 18, 2021

• #19

I am uploading an image from my server / host and saving it in my smartphone

 

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E

edgar_ortiz

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• Feb 18, 2021

• #20

roberto64 said:

I am uploading an image from my server / host and saving it in my smartphone

Click to expand...

You can "download" from server to smartphone or "upload" from smartphone to server

 

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