Re: Enumerate interfaces?

Glynn Clements (glynn@sensei.co.uk)
Tue, 8 Sep 1998 11:28:03 +0100 (BST)

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Mark H. Wood wrote:

> Would someone point me to documentation on how to walk the list of
> defined network interfaces? Thanks!

The attached example was derived from the appropriate sections of the
source code for `ifconfig'.

-- 
Glynn Clements <glynn@sensei.co.uk>




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#include <sys/socket.h>
#include <sys/ioctl.h>
#include <net/if.h>
#include <stdio.h>


int main(void)
{
	char buff[1024];
	struct ifconf ifc;
	struct ifreq *ifr;
	int skfd;
	int i;


	skfd = socket(AF_INET, SOCK_DGRAM, 0);
	if (skfd < 0)
	{
		perror("socket");
		return 1;
	}


	ifc.ifc_len = sizeof(buff);
	ifc.ifc_buf = buff;
	if (ioctl(skfd, SIOCGIFCONF, &ifc) < 0)
	{
		perror("ioctl(SIOCGIFCONF)");
		return 1;
	}


	ifr = ifc.ifc_req;


	for (i = 0; i < ifc.ifc_len / sizeof(struct ifreq); i++)
		printf("%s\n", ifr[i].ifr_name);


	return 0;
}




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