Re: pcap_findalldevs() failing on FreeBSD 7.2

[Wesley Shields <wxs () FreeBSD org>]

On Tue, Oct 27, 2009 at 12:00:04PM -0700, Aaron Turner wrote:
> 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?

I have two machines with identical hardware. They both have an nfe and
bge interface. I don't use the nfe one at all.

wxs@syn wxs % uname -sr
FreeBSD 7.1-RELEASE-p5
wxs@syn wxs % ifconfig -l
bge0 fwe0 fwip0 nfe0 lo0 pflog0
wxs@syn wxs % ifconfig nfe0
nfe0: flags=8802<BROADCAST,SIMPLEX,MULTICAST> metric 0 mtu 1500
        options=10b<RXCSUM,TXCSUM,VLAN_MTU,TSO4>
        ether 00:e0:81:5b:6b:4f
        media: Ethernet autoselect (none)
        status: no carrier
wxs@syn wxs % sudo tcpdump -D
1.bge0
2.lo0
wxs@syn wxs % sudo ifconfig nfe0 192.168.3.100/24
wxs@syn wxs % sudo tcpdump -D                    
1.bge0
2.nfe0
3.lo0
wxs@syn wxs % tcpdump -V
tcpdump version 3.9.8
libpcap version 0.9.8

I get the same results on a 9-CURRENT machine.

That is with tcpdump version 4.0.0 and libpcap version 1.0.0.

-- WXS
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