Querying IP Address of a NIC

[Joe Van Dyk]

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

 

[Detlef Reichl]

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

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

Cheers
detlef

 

[Gábor SEBESTYÉN]

--Apple-Mail-1-943152680
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format=flowed

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).

Try this:

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

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

G=C3=A1bor

"=C3=A9rtelmez=C5=91 k=C3=A9zisz=C3=B3t=C3=A1r: rekurzi=C3=B3 --> l=C3=A1s=
d: rekurzi=C3=B3"



--Apple-Mail-1-943152680--

 

[Yohanes Santoso]

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.

 

[Dick Davies]

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).

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

 

[Guillaume Marcais]

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

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

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.