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Full Discussion: Getting the External IP Address of your Computer and Storing it in a File
Operating Systems OS X (Apple) Getting the External IP Address of your Computer and Storing it in a File Post 302214008 by Audacitor on Friday 11th of July 2008 05:15:49 PM
Old 07-11-2008
Getting the External IP Address of your Computer and Storing it in a File
My computer is one of three computer on our LAN. Our router is a Time Capsule. My computer is the only of of three computers that has been assigned a static IP address on the LAN, because it runs an Apache installation. I tinker around with web development from time to time, and I wanted to be able to demo my experiments to my friends without having to throw it on a flash drive.

My home computer doesn't have a domain name, of course. I access it with my IP address, which is dynamic, and changes whenever the cats dislodge the modem.

I'm trying to write a script that checks my external IP (there's only one, we don't have aliases or multiple routers or anything), and compares to the IP in a saved file. If it finds that the IP address it detected is different from the one in the file, it sends me an email and saves the new IP to the file, where it check it later on.

1. The script is called by launchd every 5 minutes.
2. The script checks my external IP.
3. It compares it to the IP in its save file.
4. If the IP is the same as the IP in the save file, the script quits.
5. If the IP is different, the script activates another program that sends me an email.
6. I recieve the email and can refer to IP address by looking at the message's header.

I'm new to UNIX, but not totally clueless. I can move around in my computer, move, copy, and delete files, ping servers, and other basic tasks. I usually learn a new command on my own, but in this case, ifconfig (which I think I need) is just way out of my league. Can anyone help?
 

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LEARN ABOUT SUSE

slapo-dyngroup

SLAPO-DYNGROUP(5)						File Formats Manual						 SLAPO-DYNGROUP(5)

NAME

       slapo-dyngroup - Dynamic Group overlay to slapd

SYNOPSIS

       /etc/openldap/slapd.conf

DESCRIPTION

       The  Dynamic  Group overlay allows clients to use LDAP Compare operations to test the membership of a dynamic group the same way they would
       check against a static group. Compare operations targeting a group's static member attribute will be intercepted  and  tested  against  the
       configured dynamic group's URL attribute.

       Note  that  this  intercept only happens if the actual Compare operation does not return a LDAP_COMPARE_TRUE result. So if a group has both
       static and dynamic members, the static member list will be checked first.

CONFIGURATION

       This slapd.conf option applies to the Dynamic Group overlay.  It should appear after the overlay directive.

       attrpair <memberAttr> <URLattr>
	      Specify the attributes to be compared. A compare operation on the memberAttr will cause the URLattr to be evaluated for the result.

EXAMPLES

	 database bdb
	 ...
	 overlay dyngroup
	 attrpair member memberURL

FILES

       /etc/openldap/slapd.conf
	      default slapd configuration file

SEE ALSO

       slapd.conf(5), slapd-config(5).

AUTHOR

       Howard Chu

OpenLDAP 2.4.21 						    2009/12/20							 SLAPO-DYNGROUP(5)
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