dhcpcd-discuss

Hi

On 14/06/2013 0:13, Jyothsna Rajan wrote:
> i am using version 5.2.12 of dhcpcd and run into this error every
> time dhcpcd is restarted. Here is dump of the first few error 
> messages
> right after start:
>
> Apr 12 22:13:16 hgfedcba dhcpcd[3526]: version 5.2.12 starting
> Apr 12 22:13:16 hgfedcba dhcpcd[3526]: "": interface not found or 
> invalid
>
> The command being executed ( from ps aux | grep dhcpcd) is:
> /sbin/dhcpcd -q --reboot 0 --hostname "" -t 16 eth0

That's a bug which looks fixed in the latest release.

> I use the hostname option so that I can send a hostname along with
> the DHCP request. I did a wireshark capture and found that the
> hostname is being sent in the DHCP request , but it is not an empty
> string as I would expect, but a default hostname that I have 
> specified
> in /etc/rc.conf.
>
> If I remove the empty string after the hostname, i.e. execute
> /sbin/dhcpcd -q --reboot 0 --hostname -t 16 eth0
>
> the error message goes away. I do not observe any noticeable change
> in system behaviour.
>
> If I add a hostname string, i.e. execute
> /sbin/dhcpcd -q --reboot 0 --hostname "AAAABC" -t 16 eth0
>
> I get the error message
>
> Apr 12 00:41:58 TesiraServer91101311 dhcpcd[25095]: AAAABC: interface
> not found or invalid
>
>  If I completely remove the hostname option, then DHCP request does
> not include a hostname.
>
> From the error message text, it appears as if the string specified
> after hostname is being interpreted as the interface name. Per the
> spec, hostname can be an empty string. What am I doing wrong here?

The actual spec in question from RFC2132

3.14. Host Name Option

   This option specifies the name of the client.  The name may or may
   not be qualified with the local domain name (see section 3.17 for 
the
   preferred way to retrieve the domain name).  See RFC 1035 for
   character set restrictions.

   The code for this option is 12, and its minimum length is 1.

Minimum lengh of 1 means the hostname cannot be empty.
When the hostname is invalid dhcpcd sends the current hostname, unless 
that is
also invalid (or localhost for example) and then dhcpcd wont sent a 
hostname at all.

Thanks

Roy