asterisk users - Jul 2008 - OT - How to test tftp for phones provisioning

Hi,

I don't understand why a SIP hardphone can't provision itself using
tftp.
I'm very suspicious about my tftp daemon but I lack basic knowledge of Linux
CLI to pinpoint what's going wrong and separate what belongs to SIP phone
configuration from what comes from tftp server.

What I would like to do is to add a given file in current /srv/tftp
directory and test by hand that tftpd would serve this file when asked.

Googling and reading man pages, I could find command that starts tftp server
but I couldn't find any command asking for a given file (please, note I
don't imply such commands don't exist but maybe, some more general
network
tools (netcat, ...) are the one to use for basic tftp testing).

So let's say, you've got :
a perfectly running tftp server somewhere on your LAN,
it holds foo.txt file in its /srv/tftp directory.


Which command could you type in for a LAN workstation to receive this
foo.txt ?

Regards

PS1: I'm using Debian etch
PS2: With nestat -a, I've got this :

Proto Recv-Q Send-Q Local address          Remote address        Status
udp        0      0 *:tftp                  *:*

So, I think my tftp daemon is not listening but that's another topic.
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Olivier wrote:
> Hi,
>
> I don't understand why a SIP hardphone can't provision itself using
tftp.
> I'm very suspicious about my tftp daemon but I lack basic knowledge of 
> Linux CLI to pinpoint what's going wrong and separate what belongs to 
> SIP phone configuration from what comes from tftp server.
>
> What I would like to do is to add a given file in current /srv/tftp 
> directory and test by hand that tftpd would serve this file when asked.
>
> Googling and reading man pages, I could find command that starts tftp 
> server but I couldn't find any command asking for a given file 
> (please, note I don't imply such commands don't exist but maybe,
some
> more general network tools (netcat, ...) are the one to use for basic 
> tftp testing).
>
> So let's say, you've got :
> a perfectly running tftp server somewhere on your LAN,
> it holds foo.txt file in its /srv/tftp directory.
>
>
> Which command could you type in for a LAN workstation to receive this 
> foo.txt ?
>
> Regards
>
> PS1: I'm using Debian etch
> PS2: With nestat -a, I've got this :
>
> Proto Recv-Q Send-Q Local address          Remote address        Status
> udp        0      0 *:tftp                  *:*
>
> So, I think my tftp daemon is not listening but that's another topic.
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you'll want to turn on logging for tftpd so you can monitor the messages:
tail -f /var/log/messages

to test tftp if the daemon is running on the local server:
tftp localhost
get foo.txt


good luck.

>
> So let's say, you've got :
> a perfectly running tftp server somewhere on your LAN,
> it holds foo.txt file in its /srv/tftp directory.
>
> Which command could you type in for a LAN workstation to receive this
> foo.txt ?
>
  tftp is the client, do you have it installed ?... example:

  # tftp hostname
  tftp> get /srv/tftp/foo.txt
  tftp> ^D
  # cat foo.txt
  ...

  Things to check: is /srv/tftp the "tftp" directory or is it the os
filesystem
  directory where the tftp root resides ?

  Also, the tftp daemon in CentOS is started by xinetd and can be
  invoked with extra -v flags so as to increase logging verbosity.
  Check your dist. This may help...

  Cheers,
--
  exvito

On Sun, Jul 27, 2008 at 11:00:51AM +0200, Olivier wrote:
> Hi,
> 
> I don't understand why a SIP hardphone can't provision itself using
tftp.
> I'm very suspicious about my tftp daemon but I lack basic knowledge of
Linux
> CLI to pinpoint what's going wrong and separate what belongs to SIP
phone
> configuration from what comes from tftp server.
> 
> What I would like to do is to add a given file in current /srv/tftp
> directory and test by hand that tftpd would serve this file when asked.
> 
> Googling and reading man pages, I could find command that starts tftp
server
> but I couldn't find any command asking for a given file (please, note I
> don't imply such commands don't exist but maybe, some more general
network
> tools (netcat, ...) are the one to use for basic tftp testing).
First and foremost, 

  netstat -lup | grep tftp

or (probably faster):

  netstat -lnup | grep 69

This will show you the name of the process that listens on the standard
TFTP (UDP) port, if any.

Debian includes 3 (or maybe 4) tftp servers:

tftpd - Old and probably less maintained version
tftpd-hpa - A newer version. Slightly larger but this is probably the
            one to use.
atftpd - Yet another tftpd. Likewise, better than tftpd .

Both atftpd and tftpd-hpa can run either as stand-alone daemons or from
inetd. Check /etc/default/<package-name> and the docs directory for the
details. IIRC the scripts of the package already run update-inetd for
you.

Another option is to use dnsmasq. If you already happen to use it as a
DNS and/or DHCP server, then you might have noticed the extra TFTP
serving it has added in its latest versions. It only supports read-only
access. But you don't really want to support that insecure tftp upload,
right?

Logs from all the above go to /var/log/daemon.log .

-- 
               Tzafrir Cohen
icq#16849755              jabber:tzafrir.cohen at xorcom.com
+972-50-7952406           mailto:tzafrir.cohen at xorcom.com
http://www.xorcom.com  iax:guest at local.xorcom.com/tzafrir