Date: Mon, 21 Jul 2008 21:30:39 +0000 From: Jens Rehsack <rehsack@web.de> To: Brooks Davis <brooks@freebsd.org> Cc: FreeBSD Net <freebsd-net@freebsd.org> Subject: Re: lo0 not in ioctl( SIOCGIFCONF ) Message-ID: <4884FFFF.9090908@web.de> In-Reply-To: <20080721204820.GE1699@lor.one-eyed-alien.net> References: <4884F401.4050103@web.de> <20080721204820.GE1699@lor.one-eyed-alien.net>
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Brooks Davis wrote:
>> Hi,
>>
>> maybe this question is better asked in this list ...
>>
>> I was searching why ports/net/p5-Net-Interface was not working as
>> expected and found some reasons. Most of them I can answer by implementing
>> some test code as attached, but now I'm wondering why em0 is shown twice
>> and lo0 is not included.
>> The same situation on another machine ..
>
> The attachment didn't make it through.
>
> -- Brooks
Copy&Paste starts here ...
#include <stdio.h>
#include <stdlib.h>
#include <sys/socket.h>
#include <net/if.h>
#include <errno.h>
#include <strings.h>
#include <sys/ioctl.h>
#include <ifaddrs.h>
#ifndef _SIZEOF_ADDR_IFREQ
#define _SIZEOF_ADDR_IFREQ(ifr) \
((ifr).ifr_addr.sa_len > sizeof(struct sockaddr) ? \
(sizeof(struct ifreq) - sizeof(struct sockaddr) + \
(ifr).ifr_addr.sa_len) : sizeof(struct ifreq))
#endif
int
main()
{
struct ifconf ifc;
struct ifreq *ifr, *lifr;
int fd;
unsigned int n;
fd = socket( AF_INET, SOCK_STREAM, 0 );
bzero(&ifc, sizeof(ifc));
n = 3;
ifr = calloc( ifc.ifc_len, sizeof(*ifr) );
do
{
n *= 2;
ifr = realloc( ifr, sizeof(*ifr) * n );
bzero( ifr, sizeof(*ifr) * n );
ifc.ifc_req = ifr;
ifc.ifc_len = n * sizeof(*ifr);
} while( ( ioctl( fd, SIOCGIFCONF, &ifc ) == -1 ) || ( ifc.ifc_len
== n * sizeof(*ifr)) );
lifr = (struct ifreq *)&ifc.ifc_buf[ifc.ifc_len];
while (ifr < lifr)
{
printf( "%s\n", ifr->ifr_name );
ifr = (struct ifreq *)(((char *)ifr) + _SIZEOF_ADDR_IFREQ(*ifr));
}
return 0;
}
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