dhcp status apps
Alex Moen
alexm at ndtel.com
Mon Jan 7 17:17:39 UTC 2008
Edward Mann wrote:
>>> > > Subject: Re: dhcp status apps
>>> > > From: chris_cox at stercomm.com
>>> > > To: dhcp-users at isc.org
>>> > > Date: Fri, 4 Jan 2008 13:16:21 -0600
>>> > >
>>> > > On Fri, 2008-01-04 at 11:25 -0500, J E wrote:
>>> >> > > Recently a recommendation was given on the list for dhcpstatus (
>>> http://dhcpstatus.sourceforge.net/
>>> >> > > )by Glenn S. as a way to take a nicer look at leases, etc. And
>>> while
>>> >> > > it does seem to offer a nice view of some things, the project
>>> hasn't
>>> >> > > been touched in about 6 years. So v.3 support is minimal, and
>>> not
>>> >> > > complete - and of course there is no mention of v.4.
>>> > >
>>> > > I'm curious. What is it missing? You say it's "not complete".
>>> > >
>>> > > Just curious. We use it it here. We also wrote some stuff to web
>>> > > display our DNS.
>>> > >
>>> >> > >
>>> >> > > Can anyone give some recommendations for other products that may
>>> have
>>> >> > > similar, or even better features than dhcpstatus? I've checked
>>> the
>>> >> > > list archive, and done some googling but not seeing much that
>>> isn't
>>> >> > > part of some much larger project, tied into DDNS capabilities,
>>> etc.
>>> >> > > Free is best, but pay solutions may be OK too :)
>>> >> > >
>>> >> > > Thanks!
>>> >> > >
>>> >> > > jeff
>>>
>>> One thing that DHCPStatus is missing (very important, imho) is the
>>> ability
>>> to process "include" statements. We are running more than 250 subnets,
>>> and
>>> are using include statements in our dhcpd.conf that allow us to split up
>>> the conf into manageable files. DHCPStatus does not include the
>>> included
>>> configs, so it is kind of useless in this sense. I am looking at the
>>> code
>>> to see if it is easy to modify, but I am not a perlmonger by any means
>>> so
>>> I
>>> don't hold much hope! :)
>>>
>>> Alex
>>>
>>>
>> Okay i did this one quick, and was not sure if i should even touch the
>> thing. That is because of some of the messages i was reading. But here is
>> the file.
>> Note: There is a bug with the original if you have
>> key DHCP-UPDATE-KEY {
>> ...
>> ...
>> }
>>
>> it will not process the file. So once again i can see there are problems
>> with this app. But i did not find that until i got the includes to work.
>> Because my key is in an include file.
>>
>> Note2: I have not tested this code allot, and an "perlmonger" may banish
>> me from ever writing perl code again for the public consumption.
>>
>> Take the following code and replace your get_symbols function with it.
>>
>> <code>
>> #--------------------------------------------------------------------------
>> # Read all the lines in a file, and also run the includes if there are
>> # any.
>> #
>> sub get_symbols {
>> my $file;
>> if ( $#_ < 0 ) {
>> $file = "/etc/dhcpd.conf";
>> }
>> else {
>> $file = shift;
>> }
>>
>> my @sym;
>> our @includes;
>> open( FILE, $file ) || die("Can't open $file\n");
>> while ( defined(FILE) && ( my $line = <FILE> ) ) {
>> push(@sym, process_sym($line));
>>
>> }
>> close(FILE);
>> if ( @includes > 0 ) {
>> foreach $inc (@includes) {
>> open( INC, $file ) || die("Can't open $file\n");
>> while ( defined(INC) && ( my $line = <INC> ) ) {
>> push(@sym, process_sym($line));
>> }
>> close(INC)
>> }
>> }
>>
>> return (@sym);
>> }
>>
>> #--------------------------------------------------------------------------
>> # Read the line, throw away comment line (ones starting with
>> # "#", and get a list of "symbols".
>> #
>> sub process_sym {
>> $line = shift;
>> my $comment_index = index( $line, "#" ); # does this line contain a
>> if ( $comment_index >= 0 ) { # comment ?
>> if ( substr( $line, 0, 2 ) eq '#$' ) { # is it a subnet comment ?
>> $line = &get_comment($line);
>> }
>> else { # ignore everything after the
>> $line = substr( $line, 0, $comment_index ) . "\n"; # "#" sign.
>> }
>> }
>> $line =~ s/^\s+//;
>> if ( $line =~ m/^include/ ) {
>> @line = split( /\s/, $line );
>> $line[1] =~ s/"//g;
>> $line[1] =~ s/;//;
>> push( @includes, $line[1] );
>> }
>> else {
>> $line =~ s/\n/ /g;
>> $line =~ s/{/ { /g;
>> $line =~ s/\t/ /g;
>> $line =~ s/;/ ; /g;
>> $line =~ s/,/ , /g;
>> $line =~ s/"/ /g;
>> return $line;
>> }
>> }
>> </code>
>>
>> If this code is not satisfactory let me know. I only tested it with two
>> includes. YMMV.
>>
>> Thanks.
>>
>>
>>
> I should have said this is in the common.pm file. Sorry that did not make
> it in the original reply.
>
> Thanks.
>
>
Thanks for all the work, Edward... It is appreciated.
OK, I have implemented this... I can't get it to work. The server is a Sun V240 with a single UltraSPARC-IIIi and 2 gigs of memory. It's running ISC
named and dhcpd, but really not doing anything else. Load avg is at 0.04. Originally I had 194 includes (persistent host configs, known-host configs,
classes, and subnets). The script ran for half an hour, and then reported "Out of memory!". So, I cut it down to 43 subnet-only configs, same problem.
So I cut out all of the includes, and just have the initial subnet that the system sits on. I get a HUGE list of
"Use of uninitialized value in string ne at /usr/local/dhcpstatus/dhcpstatus/dhcpstatus.pm line 49"
If I copy the original common.pm file back, the output looks normal again. It looks like the changes cause a problem while scanning the leases file.
Is there anything that I can add or send that will help troubleshoot this? It would be great to get this script to work.
Thanks!
Alex
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