Forum Moderators: bakedjake
He uses a virtual domain: dude.somehost.net (dude=him)
I ping the domain to get his current IP, then add it to the ignore list so he can use the mail system.
I want to do this with a shell script, but I'm having trouble grabbing the initial ping output, for example:
PING dude.somehost.net (12.23.12.23) from 23.12.23.12 : 56(84) bytes of data.Note that this is not the data ping gathers, but just its identification of what it will do before it does it. I'd be happy to use ping's result set, but his domain is non-responsive unless he's actually doing some mail thing. i.e. I almost always get a 100% packet loss, so there's an empty ping result set.
Therefore, I want to grab the "12.23.12.23" from ping's initial output (as above) and append it to my ignore list if it is not already in there. Bonus points for removing whatever earlier IP address he had used from the ignore list before adding the current IP.
I've been trying to work with variations on the following:
ping -c1 dude.somehost.net ¦ sed -n '/net (/,/) from/p' > ignore_listhowever there is a big issue in that what I want to capture is not part of ping's result set, so whatever I try fails.
I appreciate very much any thoughts and advice. Any type of coding is welcomed (shell, PHP, whatever). This needs to run as a cronjob each hour, because his domain provider is nuts. ;)
host dude.somehost.net ¦ awk '{print $4}'
nslookup dude.somehost.net ¦ grep '^Address' ¦ tail -1 ¦ awk '{print $2}'
#!/bin/bash
TMPHOST=`host dude.somehost.net ¦ awk '{print $4}'`
if ! grep $TMPHOST ignore_list
then
host dude.somehost.net ¦ awk '{print $4}' ¦ cat >> ignore_list
service portsentry restart
fiI realized that removing the old address was absurd ... how would I remember it after it had changed? So I'm living with checking the ignore_list before I go home each day and removing any defunct entries manually.
I appreciate your help, mcavic.
[edited by: StupidScript at 8:50 pm (utc) on Jan. 23, 2009]
