Querying IP Address of a NIC

ruby-talk
1

Hi,

Other than parsing the output of `sudo /sbin/ifconfig`, anyone know of
a way to get the current IP address of a NIC? (say, eth0).

Thanks!
Joe

2

Hi,

Other than parsing the output of `sudo /sbin/ifconfig`, anyone know of
a way to get the current IP address of a NIC? (say, eth0).

on linux systems its in /sys/class/net/eth0/address

If some day someone provides bindings to the hardware abstraction layer
(libhal) you could query it from there :slight_smile:

Cheers
detlef

···

Am Dienstag, den 18.10.2005, 03:01 +0900 schrieb Joe Van Dyk:

Thanks!
Joe

3

Try this:

     ifconfig en0 inet | grep inet | awk '{print $2}'

Where "en0" is the subject of query.
Cheers,

     Gábor

"értelmező kéziszótár: rekurzió --> lásd: rekurzió"

···

On 2005.10.17., at 20:01, Joe Van Dyk wrote:

Other than parsing the output of `sudo /sbin/ifconfig`, anyone know of
a way to get the current IP address of a NIC? (say, eth0).

4

Joe Van Dyk <joevandyk@gmail.com> writes:

Hi,

Other than parsing the output of `sudo /sbin/ifconfig`, anyone know of
a way to get the current IP address of a NIC? (say, eth0).

Thanks!
Joe

Parsing ifconfig is the only method that works on the largest number
of OSes.

Other than that, you'd have to use OS-dependent feature like what
Detlef Reichl has shown.

YS.

5

Well, you don't need to run it under sudo..... :slight_smile:

···

On 17/10/05, Joe Van Dyk <joevandyk@gmail.com> wrote:

Hi,

Other than parsing the output of `sudo /sbin/ifconfig`, anyone know of
a way to get the current IP address of a NIC? (say, eth0).

--
Rasputin :: Jack of All Trades - Master of Nuns
http://number9.hellooperator.net/

6

> Hi,
>
> Other than parsing the output of `sudo /sbin/ifconfig`, anyone know of
> a way to get the current IP address of a NIC? (say, eth0).
>

on linux systems its in /sys/class/net/eth0/address

That looks like the Mac address, not the IP address.

If some day someone provides bindings to the hardware abstraction layer
(libhal) you could query it from there :slight_smile:

I actually have some code wrapping rtnetlink socket, which can get you
lots of routing information (man 7 rtnetlink). Although I use this code
to query the bandwidth manager on live machines, the code has a memory
leak, is alpha quality and fairly incomplete. I think rtnetlink is
pretty much Linux specific too.

If there is enough interest to pump up my motivation, I'll try to finish
it.

Guillaume.

···

On Tue, 2005-10-18 at 03:24 +0900, Detlef Reichl wrote:

Am Dienstag, den 18.10.2005, 03:01 +0900 schrieb Joe Van Dyk:

Cheers
detlef

> Thanks!
> Joe
>