[lug] Bletcherous pipe, FIXME!

[Jeffrey Haemer]

Sigh.  Gmail wrapped the comments.  Okay, try two.

{
  printf "ALL: localhost"
  route -n | egrep -v '^(0|169|[A-Z])' |    # grab the local
                                            #   hosts/masks
  while read dest gateway genmask etc; do   # turn into
                                            #   comma-separated list
    printf ", $dest/$gateway"
  done
  echo                                      # newline on the end
} >> /etc/hosts.allow                       # tack onto the
                                            #   hosts.allow file


On Thu, Apr 2, 2009 at 2:43 PM, Jeffrey Haemer <jeffrey.haemer at gmail.com>
wrote:
> Andrew
>
> I'd find something like this is at least easier to maintain.  YMMV.
>
> {
>   printf "ALL: localhost"
>   route -n | egrep -v '^(0|169|[A-Z])' |               # grab the
> local hosts/masks
>   while read dest gateway genmask etc; do
>     printf ", $dest/$gateway"                             # turn into
> comma-separated list
>   done
>   echo                                                             #
> newline on the end
> } >> /etc/hosts.allow                                       # tack
> onto the hosts.allow file
>
>
> On Thu, Apr 2, 2009 at 12:55 PM, Andrew Gilmore <agilmore at skybeam.com>
wrote:
>>
>> I discovered this nastiness in something I recommended in a benchmark,
and before I got it published, thought I'd see if anyone cared to try to fix
it...
>>
>> The goal is to generate a sane default hosts.allow tcp wrappers only
allowing hosts on the local networks.
>>
>> printf "ALL: localhost" >> /etc/hosts.allow
>> for I in `route -n |tail -n +3 |sed -e 's/ */ /g'| cut -f1,3 -d ' '
>>   --output-delimiter=/ | grep -vE "^(0|169)" |sort -n`; do
>>   printf ", $I" >> /etc/hosts.allow;
>> done
>> echo >> /etc/hosts.allow
>>
>> Ouch, I know.
>>
>> Anyone for a game of bash golf? :-)
>>
>> Andrew
>> _______________________________________________
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>
>
>
> --
> Jeffrey Haemer <jeffrey.haemer at gmail.com>
> 720-837-8908 [cell]
> 303-997-1219 [Google Voice]
> http://seejeffrun.blogspot.com
>



-- 
Jeffrey Haemer <jeffrey.haemer at gmail.com>
720-837-8908 [cell]
303-997-1219 [Google Voice]
http://seejeffrun.blogspot.com
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