Re: pcap_findalldevs() failing on FreeBSD 7.2

[Jung-uk Kim <jkim () FreeBSD org>]

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
-
This is the tcpdump-workers list.
Visit https://cod.sandelman.ca/ to unsubscribe.