[gentoo-user] ifconfig and ppp0 address

[gentoo-user] ifconfig and ppp0 address

[Bill Kenworthy]

For years I have been using ifconfig and some simple shell magic to
extract the ip address from the adsl ppp session when it changes.  The
latest update has changed the output format of ifconfig breaking things
so if ifconfig cant be relied on, what's normally used to extract an
interfaces IP address?  I can easily rewrite the shell magic, but its
worth asking if there is some command better suited.

BillK

Re: [gentoo-user] ifconfig and ppp0 address

[Alan McKinnon]

On Tue, 11 Dec 2012 19:33:15 +0800
Bill Kenworthy <billk@iinet.net.au> wrote:

> For years I have been using ifconfig and some simple shell magic to
> extract the ip address from the adsl ppp session when it changes.  The
> latest update has changed the output format of ifconfig breaking
> things so if ifconfig cant be relied on, what's normally used to
> extract an interfaces IP address?  I can easily rewrite the shell
> magic, but its worth asking if there is some command better suited.
> 
> BillK
> 
> 
> 

ip tends to be a little more consistent and a little more
script-friendly than ifconfig:

ip -o addr show

-o prints output on one line, making your subsequent grep, sed and
awking easier

-- 
Alan McKinnon
alan.mckinnon@gmail.com

Re: [gentoo-user] ifconfig and ppp0 address

[Helmut Jarausch]

On 12/11/2012 12:33:15 PM, Bill Kenworthy wrote:
> For years I have been using ifconfig and some simple shell magic to
> extract the ip address from the adsl ppp session when it changes.  The
> latest update has changed the output format of ifconfig breaking  
> things
> so if ifconfig cant be relied on, what's normally used to extract an
> interfaces IP address?  I can easily rewrite the shell magic, but its
> worth asking if there is some command better suited.
> 

If you're a Python fan there is a nice tool to replace 'awk' and  
similar tools:
svn checkout http://pyp.googlecode.com/svn/trunk/ pyp

I've patched this to include a 'balanced' (parenthesis, brackets,..)

With the original version I use

ifconfig wlan0 | /usr/local/bin/pyp  
"pp.after('wlan0',2)|p[1]|p.re(r'(?<=inet )\d+\.\d+\.\d+\.\d+')"

If someone is interested in my patch I'm happy to share it,
Helmut.

Re: [gentoo-user] ifconfig and ppp0 address

[David W Noon]

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On Tue, 11 Dec 2012 19:33:15 +0800, Bill Kenworthy wrote about
"[gentoo-user] ifconfig and ppp0 address":

>For years I have been using ifconfig and some simple shell magic to
>extract the ip address from the adsl ppp session when it changes.  The
>latest update has changed the output format of ifconfig breaking things
>so if ifconfig cant be relied on, what's normally used to extract an
>interfaces IP address?  I can easily rewrite the shell magic, but its
>worth asking if there is some command better suited.

I wrote a command in C++ that interrogates the TCP/IP stack directly to
obtain the IP address of any given interface.  I wrote it some years
ago, so it's only IPv4 at the moment; it will take a day or two to add
IPv6 support.

I can send you the source code if you want. Likewise to any other
interested reader -- or I can post it here as a mail attachment, since
it is quite tiny.
-- 
Regards,

Dave  [RLU #314465]
======================================================================
dwnoon@ntlworld.com (David W Noon)
======================================================================

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Re: [gentoo-user] ifconfig and ppp0 address

[Kevin Chadwick]

> I can send you the source code if you want. Likewise to any other
> interested reader 

Send to me please, Thanks

-- 
_______________________________________________________________________

'Write programs that do one thing and do it well. Write programs to work
together. Write programs to handle text streams, because that is a
universal interface'

(Doug McIlroy)
_______________________________________________________________________

Re: [gentoo-user] ifconfig and ppp0 address

[Trevor D. Manning]

I'm interested also, thanks good sir

* Kevin Chadwick (ma1l1ists@yahoo.co.uk) wrote:
> > I can send you the source code if you want. Likewise to any other
> > interested reader 
> 
> Send to me please, Thanks
> 
-- 
Trevor D. Manning

BOFH Excuse #98:

The vendor put the bug there.

Re: [gentoo-user] ifconfig and ppp0 address

[David W Noon]

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On Fri, 14 Dec 2012 02:33:56 +1100, Trevor D. Manning wrote about Re:
[gentoo-user] ifconfig and ppp0 address:

> I'm interested also, thanks good sir
> 
> * Kevin Chadwick (ma1l1ists@yahoo.co.uk) wrote:
> > > I can send you the source code if you want. Likewise to any other
> > > interested reader 
> > 
> > Send to me please, Thanks
> > 

Hi Trevor,

Attached is a tarball of the source code.  Note that you need to check
the Makefile, particularly to ensure the CHOST variable is appropriate
to your system.
-- 
Regards,

Dave  [RLU #314465]
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dwnoon@ntlworld.com (David W Noon)
*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*

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