On Fri, 25 Aug 2000, Jim Treadway wrote:
>> reading methods, I have plenty of those allready. I'm wanting
>> this so I can learn kernel interface functions, and doing it via
>> other methods does not teach what I'm wanting to learn.
>
>I believe that I saw a code example for this in one of "the Stevens"
>books, but I can't remember which one. "TCP/IP Illustrated, Vol. 2"
>(Wright/Stevens) however describes the basic mechanism in Chapter 3.
>
>Basically, I think there's an ioctl to read a "struct ifreq", and the
>particular field you want is "ifr_ifru.ifr_flags" where the "IFF_UP" flag
>is set.
>
>I think all of this is defined in "/usr/src/linux/include/linux/if.h" and
>"/usr/src/linux/net/core/dev.c".
>
>Not exactly a code sample, and not exactly portable across UN*X machines,
>sorry. :)
>
>If you can't figure it out I'll try to dig up the exact book I saw this
>in...
Thanks, I'm ok now. I found out it was much simpler by
ifnameindex()... I wrote a simple function called isifup() that
wraps the call nicely. If you're interested, let me know and
I'll send you a copy of the test program I wrote.
TTYL
--
Mike A. Harris | Computer Consultant | Capslock Consulting
Linux Advocate | Open Source Advocate | Red Hat Linux Fanatic
"A Firewall is really much like a sophisticated traffic cop; it detects and
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security is more than a Firewall; it's a process. You can't just put in a
Firewall and think you're secure."
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