[Samba] (/usr/lib64/cups/backend/smb) stopped with status 1

[YuGiOhJCJ Mailing-List]

I tried at work to run "/usr/bin/smbspool" manually:
---
$ /usr/bin/smbspool Xerox-WorkCentre-5325 \'5\' \'yugiohjcj\' \'2.pdf\' \'1\'
DEBUG: Connected with username/password...
---

The behavior at work is different from the one at home because it is not the same computer used and the /etc/samba/smb.conf is available.
However, as you can see above, the smbspool program is never closed!

I tried again to print through CUPS using the following command: lp my-hidden-file.pdf.
This time, in the CUPS error_log file, I do not see that CUPS is trying to use /usr/lib64/cups/backend/smb as backend to print.
That's weird.
It seems to be using the IPP protocol instead of SMB.
Indeed, I can find these lines in the error_log file:
---
$ grep "//" error_log
D [02/Feb/2018:10:35:56 +0100] Create-Job ipp://localhost:631/printers/Xerox-WorkCentre-5325
D [02/Feb/2018:10:35:56 +0100] [Client 16] Returning IPP successful-ok for Create-Job (ipp://localhost:631/printers/Xerox-WorkCentre-5325) from localhost
D [02/Feb/2018:10:35:56 +0100] Send-Document ipp://localhost:631/printers/Xerox-WorkCentre-5325
D [02/Feb/2018:10:35:56 +0100] [Client 17] Returning IPP successful-ok for Send-Document (ipp://localhost:631/printers/Xerox-WorkCentre-5325) from localhost
---

I expected to have something similar to this:
---
$ grep "//" error_log
D [31/Jan/2018:09:35:36 +0100] Create-Job ipp://localhost:631/printers/Xerox-WorkCentre-5325
D [31/Jan/2018:09:35:36 +0100] [Client 61] Returning IPP successful-ok for Create-Job (ipp://localhost:631/printers/Xerox-WorkCentre-5325) from localhost
D [31/Jan/2018:09:35:36 +0100] Send-Document ipp://localhost:631/printers/Xerox-WorkCentre-5325
D [31/Jan/2018:09:35:36 +0100] [Job 5] envp[24]="DEVICE_URI=smb://MyHiddenDomain/MyHiddenPC/MyHiddenShare"
D [31/Jan/2018:09:35:36 +0100] [Client 62] Returning IPP successful-ok for Send-Document (ipp://localhost:631/printers/Xerox-WorkCentre-5325) from localhost
D [31/Jan/2018:09:35:36 +0100] [Job 5] envp[24]=\"DEVICE_URI=smb://yugiohjcj:MyHiddenPassword@MyHiddenDomain/MyHiddenPC/MyHiddenShare\"
---

Why CUPS is not using the SMB protocol anymore to print please?

On Thu, 1 Feb 2018 12:47:18 +0100
YuGiOhJCJ Mailing-List <yugiohjcj-mailinglist at laposte.net> wrote:

> Hello,
> 
> There is a printer at work (a Xerox WorkCentre 5325).
> I am able to print using the following command: smbclient //MyHiddenPC/MyHiddenShare -WMyHiddenDomain -c 'print my-hidden-file.pdf'.
> However, it does not work when I try to print through CUPS using the following command: lp my-hidden-file.pdf.
> In the CUPS error_log file, the only error I can read is: [Job 5] PID 27883 (/usr/lib64/cups/backend/smb) stopped with status 1.
> I am using samba-4.4.4 and cups-2.1.4 on the client side (Slackware64 14.2 operating system).
> 
> Any suggestion please?
> 
> I remarked that "ls -l /usr/lib64/cups/backend/smb" gives "/usr/bin/smbspool" as target.
> When I run "/usr/bin/smbspool" manually with the same options than in the error_log file (/usr/bin/smbspool Xerox-WorkCentre-5325 \'5\' \'yugiohjcj\' \'2.pdf\' \'1\') I get status 1 and this error message: "ERROR: Can't load /etc/samba/smb.conf - run testparm to debug it".
> Indeed, /etc/samba/smb.conf is missing (I thought it was not mandatory for the client part).
> Creating the /etc/samba/smb.conf file seems to be the solution.
> Well, I will try that at work.
> 
> I have three questions:
> 1) Do you know which PPD file is used when I am printing with the smbclient command? (I have not specified any PPD file through this command line so I am wondering how it works)
> 2) It seems that the password stored in /etc/cups/printers.conf is sent through network in the device URI using the smb protocol. So, is it encrypted or anyone can see it?
> 3) When I go to localhost:631 to add the printer I give the full URI: smb://yugiohjcj:MyHiddenPassword@MyHiddenDomain/MyHiddenPC/MyHiddenShare but when I look in the /etc/cups/printers.conf file I only see this: smb://MyHiddenDomain/MyHiddenPC/MyHiddenShare. Why the username and password are not here please?
> 
> Thank you.
> Best regards.