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Forum Topic - ifs with ftp cabapility?:

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enes aykurt

01/12/2013 4:57 AM

post98528

Hi all,

I have got an intel atom processor card and I am booting it by using an SSD. I created an ifs image and booted the card 
with it. However after boot I could not write/modify the etc, usr, bin, lib files on target. I think that is because of 
the image's read only property. But I need some services which will use those files dynamically. 

For example I need ftp service and as far as I know to use ftp a user should have a password. However to change the 
password, passwd utility using/modfiying the files under /etc. How can I manage to make those files writable? Where am I
 doing wrong? If someone help me I ll appretiate.

Thanks and regards

Mario Charest

01/12/2013 1:03 PM

post98531

RE: ifs with ftp cabapility?

Try passing  -osync=optional to devb-*

-----Message d'origine-----
De : enes aykurt [mailto:community-noreply@qnx.com] 
Envoyé : Saturday, January 12, 2013 10:58 PM
À : general-filesystems
Objet : ifs with ftp cabapility?

Hi all,

I have got an intel atom processor card and I am booting it by using an SSD. I created an ifs image and booted the card 
with it. However after boot I could not write/modify the etc, usr, bin, lib files on target. I think that is because of 
the image's read only property. But I need some services which will use those files dynamically. 

For example I need ftp service and as far as I know to use ftp a user should have a password. However to change the 
password, passwd utility using/modfiying the files under /etc. How can I manage to make those files writable? Where am I
 doing wrong? If someone help me I ll appretiate.

Thanks and regards




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enes aykurt

01/13/2013 9:39 AM

post98534

Re: RE: ifs with ftp cabapility?

can you please send me the documentation about that ?

Chris Travis

01/13/2013 10:25 AM

post98535

RE: RE: ifs with ftp cabapility?

That will not help as you are not using a devb driver.  

You need to include all of the files necessary in the ifs including /etc/passwd

Here is a link from the Support Knowledge Base that shows a build image with the necessary files that allows you to 
telnet into it:
http://www.qnx.com/support/knowledgebase.html?id=50130000000SzKu

Chris


-----Original Message-----
From: enes aykurt [mailto:community-noreply@qnx.com] 
Sent: January-13-13 9:40 AM
To: general-filesystems
Subject: Re: RE: ifs with ftp cabapility?

can you please send me the documentation about that ?



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enes aykurt

01/13/2013 4:59 PM

post98536

Re: RE: RE: ifs with ftp cabapility?

Hi Chris,

I have already done the telnet, my problem is about ftp. For ftp as you know I need also the shadow file because ftp 
user must have a password. However I could not figure out how to form and locate an encrypted file in ifs.I tried to 
form a shadow file by using a QNX disk system and used it on my ifs however that didnt work.

Tomorrow I will try the devb driver modification that you have suggested. Can you please explain me the affect of this 
option ?

regards

Chris Travis

01/13/2013 5:56 PM

post98538

Re: RE: RE: ifs with ftp cabapility?

A few options.  Once you telnet into the target you can run ftp "from" the target to get the file to the target(in/dev/
shmem), or if you really need to ftp into the target then you can put writable files into /dev/shmem ; just create a 
link in the build file from /etc/shadow to /dev/shmem/shadow. You could also use devf-ram to create a ram filesystem...
that you could write to.

Devb suggestion wasn't mine.


Sent from my BlackBerry 10 smartphone.

From: enes aykurt
Sent: Sunday, January 13, 2013 4:57 PM
To: general-filesystems
Reply To: general-filesystems@community.qnx.com
Subject: Re: RE: RE: ifs with ftp cabapility?


Hi Chris,

I have already done the telnet, my problem is about ftp. For ftp as you know I need also the shadow file because ftp 
user must have a password. However I could not figure out how to form and locate an encrypted file in ifs.I tried to 
form a shadow file by using a QNX disk system and used it on my ifs however that didnt work.

Tomorrow I will try the devb driver modification that you have suggested. Can you please explain me the affect of this 
option ?

regards




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General
http://community.qnx.com/sf/go/post98536
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Mario Beaulieu(deleted)

01/14/2013 10:16 AM

post98546

Re: RE: RE: ifs with ftp cabapility?

To use FTP, you will need a file:
/etc/ftpusers
If this file is absent, all ftp accesses will be denied.

In order to write in /etc (and in a few other directories), you need to remount the filesystem as writable.
To do that:

mount -uw /base
... now the system is writable
... do your stuff
... and restore it to read-only when you are done
mount -ur /base

Note that you cannot overwrite or modify a file. To do such a thing, you will need to rename or delete the original, 
then create the "modified" version.

Chris Travis

01/14/2013 11:45 AM

post98549

RE: RE: RE: ifs with ftp cabapility?

Good call on the /etc/ftpusers, I had forgotten about that file.  Also, ignore the mount instructions that is for a 
device with a writable filesystem mounted as /base ;-)

-----Original Message-----
From: Mario Beaulieu [mailto:community-noreply@qnx.com] 
Sent: January-14-13 10:17 AM
To: general-filesystems
Subject: Re: RE: RE: ifs with ftp cabapility?

To use FTP, you will need a file:
/etc/ftpusers
If this file is absent, all ftp accesses will be denied.

In order to write in /etc (and in a few other directories), you need to remount the filesystem as writable.
To do that:

mount -uw /base
... now the system is writable
... do your stuff
... and restore it to read-only when you are done mount -ur /base

Note that you cannot overwrite or modify a file. To do such a thing, you will need to rename or delete the original, 
then create the "modified" version.

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enes aykurt

01/14/2013 1:49 PM

post98550

Re: RE: RE: RE: ifs with ftp cabapility?

Thanks guys. I thought that file just only for restriction and ignored it.  I will try it tomorrow and inform you.

Regards.

enes aykurt

01/17/2013 12:08 PM

post98638

Re: RE: RE: RE: ifs with ftp cabapility?

Adding that file solved my problem. Of course I added a shadow file for password which was created in a writable file 
system. Thanks for your help.

Regards

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