passing values to client

[Carl Karsten]

glad I asked - "site local" was just the right phase to google.

I seem to have it all setup, but I am not seeing the values come over.

Now wondering what the best way to debug this is.  I have used wireshark, but 
hoping there is something easier.

Simon Hobson wrote:
> Carl Karsten wrote:
>> Currently the clonezilla CD will bring up sshd and set a password if 
>> you enter 2 boot parameters.
>>
>> I am trying to figure out how to add some code that will get those 2 
>> parameters from the dhcp client.   So what is the normal way for an 
>> app to get parameters that were received by dhcpcd or dhclient?
> 
> I don't know the details as I've never done anything special in the 
> client, but there are three steps involved.
> 
> First, you will need to configure the server to supply the parameters - 
> in this case, you'll probably have to define "site local" options.

# /etc/dhcp3/dhcpd.conf
authoritative;

# log using syslogd
log-facility local7;

option cz-ocs_daemonon code 224 = string;
option cz-usercrypted code 225 = string;

subnet 192.168.1.0  netmask 255.255.255.0 {
         range 192.168.1.10 192.168.1.254 ;
         filename "pxelinux.0" ;
         option cz-ocs_daemonon "ssh";
         option cz-usercrypted "iTBGwkbHzKDfk";
}



> 
> Then you'll need to configure the client to ask for them. This is in the 
> client config file where (IIRC) you can specify a custom option list to 
> be requested.

# /etc/dhcp3/dhclient.conf

option cz-ocs_daemonon code 224 = string;
option cz-usercrypted code 225 = string;

request cz-ocs_daemonon, cz-usercrypted, (existing options: subnet-mask, 
broadcast-address...)

> 
> 
> Lastly, I assume the client will store what it receives somewhere before 
> calling the client script. If you look at the client, there is a script 
> which does all the processing - so you will probably want to modify that 
> to stash the values where they are easily accessible to your application.
> 
> In Debian the files are in /etc/dhcp3, and I see that there are two 
> directories dhclient-[enter|exit]-hooks.d which contain scripts that are 
> run by the client on a state change.
> 
> 


Sun Jan 11 07:54:54 PST 2009: entering dhclient-exit-hooks.d, dumping variables.
reason='REBOOT'
cz-ocs_daemonon=''
cz-usercrypted=''
interface='eth0'
medium=''
alias_ip_address=''
new_ip_address='192.168.1.253'
new_subnet_mask='255.255.255.0'
new_domain_name='personnelware.com'
new_domain_search=''
new_domain_name_servers='192.168.1.7'
new_routers='192.168.1.1'
new_static_routes=''
old_ip_address=''
old_subnet_mask=''
old_domain_name=''
old_domain_search=''
old_domain_name_servers=''
old_routers=''
old_static_routes=''
--------------------------