Re: [naviserver-devel] Hostname/IP resolving?

[Vlad S. <vl...@cr...>]

On the other hand, on my servers i often use 0.0.0.0 as address, so nsd 
listens on all registered interfaces. For me it sound more logical then 
trying to determine what IP address i am resolving to, if no specific 
then listen on all.


Zoran Vasiljevic wrote:
> 
> On 19.04.2006, at 16:31, Vlad Seryakov wrote:
> 
>> So, it is logically that reverse DNS is used to get the name.
> 
> 
> OK. This makes sense only if there is no hostname assigned
> to the nsssock. Because if it is, the reverse-lookup has
> absolutely no meaning, and is shooting ourselves in the
> foot.
> 
> Therefore I'd do that reverse lookup only if no hostname
> is defined to nssock, like this below.
> Is this OK for everybody?
> 
> ------------------ driver.c:Ns_DriverInit()
> 
>     host = Ns_ConfigGetValue(path, "hostname");
>     bindaddr = address = Ns_ConfigGetValue(path, "address");
>     defserver = Ns_ConfigGetValue(path, "defaultserver");
> 
>     /*
>      * If the listen address was not specified, attempt to determine it
>      * through a DNS lookup of the specified hostname or the server's
>      * primary hostname.
>      */
> 
>     if (address == NULL) {
>         he = gethostbyname(host ? host : Ns_InfoHostname());
> 
>         /*
>          * If the lookup suceeded but the resulting hostname does not
>          * appear to be fully qualified, attempt a reverse lookup on the
>          * address which often returns the fully qualified name.
>          *
>          * NB: This is a common but sloppy configuration for a Unix
>          * network.
>          */
> 
> /*-------- ^^^^^^^^^^^^^^^^  -------*/
> 
>         if (host == NULL && he != NULL && he->h_name != NULL &&
>             strchr(he->h_name, '.') == NULL) {
>             he = 
> gethostbyaddr(he->h_addr_list[0],he->h_length,he->h_addrtype);
>         }
> 
>         /*
>          * If the lookup suceeded, use the first address in host entry 
> list.
>          */
> 
>         if (he == NULL || he->h_name == NULL) {
>             Ns_Log(Error, "%s: could not resolve %s: %s", module,
>                    host ? host : Ns_InfoHostname(), strerror(errno));
>             return NS_ERROR;
>         }
>         if (*(he->h_addr_list) == NULL) {
>             Ns_Log(Error, "%s: no addresses for %s", module,
>                    he->h_name);
>             return NS_ERROR;
>         }
> 
>         memcpy(&ia.s_addr, he->h_addr_list[0], sizeof(ia.s_addr));
>         address = ns_inet_ntoa(ia);
> 
>         /*
>          * Finally, if no hostname was specified, set it to the hostname
>          * derived from the lookup(s) above.
>          */
> 
>         if (host == NULL) {
>             host = he->h_name;
>         }
>     }
> 
> 
> 
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-- 
Vlad Seryakov
571 262-8608 office
vl...@cr...
http://www.crystalballinc.com/vlad/