NSClient++ DNS name instead of IP address

[Andreas Ericsson]

narendran.neelamegam at wipro.com wrote:
> Hi,
> Is it possible to provide hostname instead of the IP address of the
> Nagios server in allowed hosts and use DNS to resolve?
>  
> allowed_hosts=FQDN
>  
> How can we achieve this?
>  

I'm guessing you're doing this either for NRPE or NSCA, correct?

If so, the sad answer is that you can't. Both those programs store the 
"allowed_hosts" variable as a string in memory and converts the incoming 
IP-address to its string notation equivalence. They then match the 
stringified IP-address with whatever you put on allowed_hosts. Since 
system calls never return the FQDN of a connecting host, you're screwed.

-- 
Andreas Ericsson                   andreas.ericsson at op5.se
OP5 AB                             www.op5.se
Tel: +46 8-230225                  Fax: +46 8-230231

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