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<TITLE>The Answer Guy 35: Using A Dynamically Assigned Address from PPP Startup Script</TITLE>
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<H4>"The Linux Gazette...<I>making Linux just a little more fun!</I>"</H4>
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<H1><A NAME="answer">
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<H4>By James T. Dennis,
<a href="mailto:answerguy@ssc.com">answerguy@ssc.com</a><BR>
Starshine Technical Services,
<A HREF="http://www.starshine.org/">http://www.starshine.org/</A>
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<H3 align="left"><img src="../../gx/dennis/qbubble.gif" height="50" width="60"
alt="(?) " border="0">Using A Dynamically Assigned Address from PPP Startup Script</H3>
<p><strong>From D. Kim Croft on Tue, 17 Nov 1998
</strong></p>
<!-- begin 19 -->
<P><STRONG>
I am trying to set up a script that, when I connect to the
internet will write a little html file with a link to my ipaddress
to upload to my web account on my isp. However my ip address is
dynammically assigned so I never know exactly what it is. In
windows I can netstat -rn to find it but,in linux when I netstat
-rn i only get my ?router?. Anyways If you know of any way that I
can find my ipaddress when I connect. it would be greatly
apprecciated.
</STRONG></P>
<BLOCKQUOTE><IMG SRC="../../gx/dennis/bbub.gif" alt="(!)"
HEIGHT="28" WIDTH="50" BORDER="0"
>
Let's assume that you are using the Linux pppd package
to establish this connection. In that case the most
obvious method would be to call your script from the
'<TT>/etc/ppp/ip-up</TT>' script. Reading the '<tt>pppd</tt>' man page
we find a couple of references to this file, which is
automagically called when the PPP session is established.
('<TT>/etc/ppp/ip-down</TT>' is called when the session is
terminated).
</BLOCKQUOTE>
<BLOCKQUOTE>
It's called with five parameters including:
</BLOCKQUOTE>
<BLOCKQUOTE><BLOCKQUOTE>
interface device speed your-IP their-IP
</BLOCKQUOTE></BLOCKQUOTE>
<BLOCKQUOTE>
.. and there's an option to provide an additional,
admin specified parameter which can be set from your
options file.
</BLOCKQUOTE>
<BLOCKQUOTE>
So you can write your script to just take the
parameters you need (just the local IP address in
this case) can call it with an entry in your ip-up
script with a command like:
</BLOCKQUOTE>
<blockquote><pre> /usr/local/bin/update-my-web-page $4
</pre></blockquote><BLOCKQUOTE>
... where 'update-my-web-page' is a shell, perl, awk,
Python, TCL, or other script or program that opens
a connection to your website's host and writes your
page to it. (I'll assume that you have '<tt>rcp/rsh</tt>',
ksh (Kerberos '<tt>rsh</tt>') '<tt>ssh</TT>/<tt>scp</tt>'
or C-kermit or '<tt>expect</tt>/ftp'
connect and tranfer script that can automate the file
propagation process.
</BLOCKQUOTE>
<P><STRONG><IMG SRC="../../gx/dennis/qbub.gif" ALT="(?)"
HEIGHT="28" WIDTH="50" BORDER="0"
>
thankyou
</STRONG></P>
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<H5 align="center"><a href="http://www.linuxgazette.com/ssc.copying.html"
>Copyright ©</a> 1998, James T. Dennis
<BR>Published in <I>The Linux Gazette</I> Issue 35 December 1998</H5>
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