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How to retrieve an interface's MAC address
- Date: Mon, 14 Apr 2008 15:17:23 +0200
- From: arnout at mind.be (Arnout Vandecappelle)
- Subject: How to retrieve an interface's MAC address
Chris Johns wrote:
> Arnout Vandecappelle wrote:
>> I need to get the network interface's MAC address from my
>> application. According to the Wiki (Obtaining_Interface_Information),
>> this can be
>> obtained by ioctl'ing for SIOCGIFADDR. However, this gives the IP
>> address (ether_ioctl does return the MAC address, but it never gets
>> there as it is intercepted by in_control). As far as I can see, there
>> is no simple way to retrieve the MAC address from the application. (You
>> can get it from within the networking stack one you have the struct
>> ifnet, like is done in the DHCP client, but this is not supposed to be
>> accessible from the application.)
>> Is there a way to retrieve it that I missed?
> There is the sysctl interface which is used by net-snmp to provide
> details about an interface. Not a nice interface but it does work.
> What about the SIOCGIFCONF ioctl ? See
> cpukit/libnetworking/libc/getifaddrs.c for an example of its use. Look
> for the socket part of the code. Check 'ifconf' in
> Please update the Wiki if you get a solution.
It took me a week to implement this, but here it goes. I updated the
Wiki as well.
Since I'm working with a 4.6.99 version, could someone try this on the
Arnout Vandecappelle arnout at mind be
Senior Embedded Software Architect +32-16-286540
Mind Embedded Development (an Essensium division)
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