Re: pcap_findalldevs() failing on FreeBSD 7.2

[Aaron Turner <synfinatic () gmail com>]

On Tue, Oct 27, 2009 at 11:55 AM, Jung-uk Kim <jkim () freebsd org> wrote:
> On Friday 25 September 2009 01:18 am, Aaron Turner wrote:
> > I've got a user of tcpreplay having issues where his interfaces are
> > not being returned via pcap_findalldevs() under FreeBSD 7.2 using
> > libpcap 0.9.7.  I don't have much more information unfortunately,
> > but I do know he has an "nVIDIA nForce 10/100/1000 Ethernet" NIC as
> > well as the obvious loopback.
> >
> > I've confirmed he is running as root and the interface is up:
> >
> > nfe0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0
> > mtu 1500
> > options=19b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,TSO4>
> > ether 00:1e:8c:b1:de:91
> >         inet 192.168.1.111 netmask 0xffffff00 broadcast
> > 192.168.1.255 media: Ethernet autoselect (100baseTX
> > <full-duplex,flag0,flag1>) status: active
> >
> > Actually, none of his interfaces are being returned (nfe0, nfe1 and
> > lo0).  I looked in the change log and don't see any mention of any
> > improvements/fixes in pcap_finalldevs() since 0.9.7 so I figured
> > I'd mention it.
>
> It's working fine for me:
>
> %uname -mrs
> FreeBSD 9.0-CURRENT amd64
> %tcpdump -D
> 1.re0
> 2.lo0
> %tcpdump -c 10 -w /dev/null
> tcpdump: listening on re0, link-type EN10MB (Ethernet), capture size
> 96 bytes
> 10 packets captured
> 18 packets received by filter
> 0 packets dropped by kernel
>
> Note "tcpdump -D" is using pcap_findalldevs() as well:
>
> tcpdump.c:
> --------------------------------------------------
> #ifdef HAVE_PCAP_FINDALLDEVS
>    case 'D':
>        if (pcap_findalldevs(&devpointer, ebuf) < 0)
>            error("%s", ebuf);
>        else {
>            for (i = 0; devpointer != 0; i++) {
>                printf("%d.%s", i+1, devpointer->name);
>                if (devpointer->description != NULL)
>                    printf(" (%s)", devpointer->description);
>                printf("\n");
>                devpointer = devpointer->next;
>            }
>        }
>        return 0;
> --------------------------------------------------
>
> Jung-uk Kim

I notice you're using FreeBSD 9.0... what version of libpcap?  I
wonder if this is a libpcap bug or something in FreeBSD?

-- 
Aaron Turner
http://synfin.net/
http://tcpreplay.synfin.net/ - Pcap editing and replay tools for Unix & Windows
Those who would give up essential Liberty, to purchase a little temporary
Safety, deserve neither Liberty nor Safety.
    -- Benjamin Franklin
"carpe diem quam minimum credula postero"
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