[CentOS] [CentOS 5] tftp-server, unable to create new files (even with "-c" option)

[Grant McChesney]

On 9/13/07, Davide Grandis <davide.grandis at fastwebnet.it> wrote:
>
> Hi all,
>
> I'm trying to setup a TFTP server to serve as repository for the
> config of all my Cisco network devices.
>
> As per the the tftpd man, I've added the "-c" option into the /etc/
> xinetd.d/tftp (as follows) but I still cannot get write access
> (unless the file is already present).
>
> [root at chl1 ~]# cd /etc/xinetd.d
> [root at chl1 xinetd.d]# cat tftp
> # default: off
> # description: The tftp server serves files using the trivial file
> transfer \
> #       protocol.  The tftp protocol is often used to boot diskless \
> #       workstations, download configuration files to network-aware
> printers, \
> #       and to start the installation process for some operating
> systems.
> service tftp
> {
>          disable = no
>          socket_type             = dgram
>          protocol                = udp
>          wait                    = no
>          user                    = root
>          server                  = /usr/sbin/in.tftpd
>          server_args             = -s -c /tftpboot
>          per_source              = 11
>          cps                     = 100 2
>          flags                   = IPv4
> }
>
> And here is it concerning the home path owner & permissions:
>
> [root at chl1 /]# ls -la
> ...
> drwxrwxrwx   2 root root  4096 Sep 13 10:18 tftpboot
> ...
> [root at chl1 /]# ls -la tftpboot/
> drwxrwxrwx  2 root   root      4096 Sep 13 10:18 .
> drwxr-xr-x 25 root   root      4096 Sep 13 17:48 ..
> -rwxrwxrwx  1 nobody nobody 1811552 Sep 12 10:28 c3500xl-c3h2s-mz.
> 120-5.WC17.bin
> -rwxrwxrwx  1 nobody nobody    1181 Sep 13 17:51 pippo.config
>
> (pippo.config = fake file)
>
> This is what I get at the TFTP client side:
>
> LabTI-Infra-3524XL-01#copy running-config tftp:
> Address or name of remote host []? 10.58.2.204
> Destination filename [labti-infra-3524xl-01-confg]?
> TFTP: error code 1 received - File not found
>
> %Error opening tftp://10.58.2.204/labti-infra-3524xl-01-confg
> (Undefined error)
>
> LabTI-Infra-3524XL-01#
> LabTI-Infra-3524XL-01#copy running-config tftp:
> Address or name of remote host []? 10.58.2.204
> Destination filename [labti-infra-3524xl-01-confg]? pippo.config
> !!
> 2327 bytes copied in 0.831 secs
>
> So, it means that the TFTP client can only *re-write* an existing
> file but not creating new ones, and this is the expected behavior if
> the "-c" parameter is omitted!
>
> What am I missing?
>
> Any suggestion really appreciated!
>
> TIA,
> Davide
>
>

I had this same problem when trying to back up my switch configs.  After
some googling, I found a workaround for RH-based systems.  The workaround is
disable tftp in xinetd, and run in.tftpd manually.  I never figured out why
it would not work with xinetd.
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