From owner-freebsd-questions Sun Dec 9 9:14:47 2001 Delivered-To: freebsd-questions@freebsd.org Received: from sage-american.com (sage-american.com [216.122.141.44]) by hub.freebsd.org (Postfix) with ESMTP id 71E6937B405 for ; Sun, 9 Dec 2001 09:14:39 -0800 (PST) Received: from SAGEONE (adsl-64-219-20-12.dsl.crchtx.swbell.net [64.219.20.12]) by sage-american.com (8.9.3/8.9.3) with SMTP id LAA12481; Sun, 9 Dec 2001 11:14:32 -0600 (CST) Message-Id: <3.0.5.32.20011209111434.0101cb38@mail.sage-american.com> X-Sender: jacks@mail.sage-american.com X-Mailer: QUALCOMM Windows Eudora Pro Version 3.0.5 (32) Date: Sun, 09 Dec 2001 11:14:34 -0600 To: "Oliver, Michael W." From: jacks@sage-american.com Subject: RE: Scripting help Cc: "'freebsd-questions@freebsd.org'" In-Reply-To: <1DA741CA6767A144BAA4F10012536C27A923@LKLDDC01.GARGANTUAN.C OM> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG Thanks for more testing.... getting closer now! At 11:57 AM 12.9.2001 -0500, Oliver, Michael W. wrote: >Jack, > >I just tried this on my server, and had to make a couple of tweaks.... This >might be better.... > > > >#!/bin/sh > >while [ 1 ] >do > > LAST_KNOWN_IP=`cat last_known_ip_file`; > CURRENT_IP=`ifconfig sis0 | grep inet | grep -v inet6 | awk ' { print >$2; } '`; > > if [ -z "$LAST_KNOWN_IP" ] > then > # run your dns ping program here using $CURRENT_IP > echo $CURRENT_IP >last_known_ip_file; > continue > fi > > if [ "$LAST_KNOWN_IP" = "$CURRENT_IP" ] > then > sleep 30; > continue > else > # run your dns ping program here using $CURRENT_IP > echo $CURRENT_IP >last_known_ip_file; > fi > >done > >EOF > > > > > >Of course, you would have to change the 'sis0' interface name to the one you >are looking to monitor. HTH.... > >=========== >Michael Oliver > >> -----Original Message----- >> From: jacks@sage-american.com [mailto:jacks@sage-american.com] >> Sent: Sunday, December 09, 2001 11:51 AM >> To: Oliver, Michael W.; freebsd-questions@freebsd.org >> Cc: Oliver, Michael W. >> Subject: RE: Scripting help >> >> >> Thanks Michael, will work on it.... >> >> At 11:32 AM 12.9.2001 -0500, Oliver, Michael W. wrote: >> >Jack, >> > >> >Well, this will be my first script written from scratch, so >> please be kind >> >if I dork it up! Try this: >> > >> > >> > >> > >> > >> > >> >#!/bin/sh >> > >> >while [ 1 ] >> >do >> > >> > LAST_KNOWN_IP=`cat last_known_ip_file` >> > CURRENT_IP=`ifconfig tun0 | grep inet | awk ' { print $2; } '` >> > >> > if [ -z "$LAST_KNOWN_IP"] >> > then >> > # run your dns ping program here using $CURRENT_IP >> > echo $CURRENT_IP >last_known_ip_file >> > continue >> > fi >> > >> > if [ "$LAST_KNOWN_IP" = "$CURRENT_IP" ] >> > then >> > sleep 30 >> > continue >> > else >> > # run your dns ping program here using $CURRENT_IP >> > echo $CURRENT_IP >last_known_ip_file >> > fi >> > >> >done >> > >> >EOF >> > >> > >> > >> > >> > >> > >> > >> > >> >Please let me know how it turns out ;-) >> > >> >=========== >> >Michael Oliver >> > >> > >> > >> > >> > >> > >> > >> > >> > >> > >> > >> >> -----Original Message----- >> >> From: jacks@sage-american.com [mailto:jacks@sage-american.com] >> >> Sent: Sunday, December 09, 2001 11:02 AM >> >> To: freebsd-questions@freebsd.org >> >> Subject: Scripting help >> >> >> >> >> >> I have just set up an experimental FBSD 4.4-STABLE server >> >> using DSL with >> >> dynamic ip. Using ZoneEdit DNS services, the DNS can be >> >> updated with a cron >> >> script to still point to the proper name. I'm doing that now >> >> using cron to >> >> run the update script every 8 hours (the connection usually >> >> runs for weeks >> >> at a time without disconnect). >> >> >> >> However, I had rather have a script that runs every so often >> >> (xminutes) and >> >> doesn't bother the DNS server unless and ONLY if a changed in >> >> the dynamic >> >> IP has occured as a result of disconnect/reconnect. Here are >> >> the functions >> >> I see needed, but scripting language is not yet a decent >> >> skill of mine. I >> >> suspect others using dynamic IPs have this same need: Any guidence >> >> appreciated once again. (I've looked at the ipcheck that uses >> >> Python, but >> >> rather not go that route if possible to do the simple >> >> approach below). >> >> >> >> BEGIN (my crude) SCRIPT: >> >> #!/bin/sh >> >> PATH=/usr/local/bin:/usr/bin:/bin >> >> ## This script would be run by cron every x_minutes >> >> ## (files needed: "last_known_ip" and "my_current_ip") >> >> ## Contents of last_known_ip (placed there manually at for >> >> first output >> >> ## by running ifconfig tun0 > last_known_ip >> >> >> >> tun0: flags=8051 mtu 1492 >> >> inet 64.xxx.xx.20 --> 64.xxx.xx.254 netmask 0xffffffff >> >> Opened by PID 149 >> >> >> >> ## Run update to my_current_ip file >> >> # function: ifconfig tun0 > my_current_ip >> >> >> >> ##.... so the "my_current_ip" file would contain output of: >> >> tun0: flags=8051 mtu 1492 >> >> inet 64.xxx.xx.20 --> 64.xxx.xx.254 netmask 0xffffffff >> >> Opened by PID 149 >> >> >> >> ## Now make comparison to see if dynamic ip has changed and >> >> update DNS if >> >> changed. >> >> # function: look in my_current_ip and find the current ip >> >> (64.xxx.xx.20) >> >> # function: look in last_known_ip file and find ip (64.xxx.xx.66) >> >> # function: if not same, then run DNS_ping_program to update >> >> (ping command >> >> here) >> >> ## If change detected, update comparison file >> >> # function: ifconfig tun0 > last_known_ip >> >> # function: if same ip, then do nothing >> >> END OF SCRIPT >> >> >> >> The above may be a crude approach, but best way I can define >> >> the job for >> >> now.... >> >> >> >> Best regards, >> >> Jack L. Stone, >> >> Server Admin >> >> >> >> Sage-American >> >> http://www.sage-american.com >> >> jacks@sage-american.com >> >> >> >> To Unsubscribe: send mail to majordomo@FreeBSD.org >> >> with "unsubscribe freebsd-questions" in the body of the message >> >> >> > >> > >> >> Best regards, >> Jack L. Stone, >> Server Admin >> >> Sage-American >> http://www.sage-american.com >> jacks@sage-american.com >> > >To Unsubscribe: send mail to majordomo@FreeBSD.org >with "unsubscribe freebsd-questions" in the body of the message > > Best regards, Jack L. Stone, Server Admin Sage-American http://www.sage-american.com jacks@sage-american.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message