Keep hosts Mac address

[Prunk Dump]

2013/12/4 David Forrest <drf at maplepark.com>:
> On Wed, 4 Dec 2013, Prunk Dump wrote:
>
>> Hello,
>>
>> I'm looking for a way to keep my hosts mac address in a database so I
>> can power on them using their WOL capability. The DHCP server seems a
>> good starting point to do this because it give or query the host-names
>> and manages the leases with the mac addresses.
>
> ...
>
>> Can anyone give me an idea ?
>
>
> I use dhcp logging.  From my current dhcpd.conf:
>
> ##### new lease issued logging
> on commit { if (static) {
>               log (info, concat (
>                 "DHCPNETMON ",
>                 binary-to-ascii (10,32,"",encode-int (lease-time,32))," ",
>                 substring (binary-to-ascii (16,8,":",hardware), 2,17)," ",
>                 binary-to-ascii (10,8,".",leased-address)," ",
>                 pick-first-value(host-decl-name, "(none)"),
>                 " static"));
>             } else {
>               log (info, concat (
>                 "DHCPNETMON ",
>                 binary-to-ascii (10,32,"",encode-int (lease-time,32))," ",
>                 substring (binary-to-ascii (16,8,":",hardware), 2,17)," ",
>                 binary-to-ascii (10,8,".",leased-address), " ",
> pick-first-value(ddns-fwd-name,host-decl-name,host-name,"(none)"),
>                 " dynamic"));
>             }
>
> and looking at the log file, it appears this might then work for you:
> $ sudo grep DHCPNETMON /var/log/messages |cut -d \  -f 9,10|sort|uniq
> 0:c0:a8:da:94:35 192.168.102.126
> 28:ef:1:48:89:64 192.168.102.129
> 52:54:0:ae:45:1d 192.168.102.118
> ec:9a:74:94:68:64 192.168.102.127
> $
>
>
> Dave
> --
> David Forrest        e-mail    drf at maplepark.com
> Maple Park Development     http://www.maplepark.com
> St. Louis, Missouri
> _______________________________________________
> dhcp-users mailing list
> dhcp-users at lists.isc.org
> https://lists.isc.org/mailman/listinfo/dhcp-users


Thanks !

This is exactly what I want ! But I need to keep the built-in version
of the DNS update. In the documentation It is say to copy the script
of the top of the server/dhcpd.c file in the commit event. But I can
read this in the source code :



/* This stuff is always executed to figure the default values for certain
   ddns variables. */

char std_nsupdate [] = "                            \n\
option server.ddns-hostname =                            \n\
  pick (option fqdn.hostname, option host-name);                \n\
option server.ddns-domainname =    config-option domain-name;            \n\
option server.ddns-rev-domainname = \"in-addr.arpa.\";";


/* This is the old-style name service updater that is executed
   whenever a lease is committed.  It does not follow the DHCP-DNS
   draft at all. */

char old_nsupdate [] = "                            \n\
on commit {
...
....
....}
"


The comments say that is the old style DNS updater. This means that it
will not be executed ?  I need to copy this old_nsupdate code ? Will
this change the built-in DDNS behavior ?


Where can I find a example configuration file ?

Thanks !

PELLEGRIN Baptiste.