Re: pcap_findalldevs() failing on FreeBSD 7.2

["Gianluca Varenni" <gianluca.varenni () cacetech com>]

----- Original Message ----- 
From: "Abdelrazak Younes" <younes.abdel () gmail com>
To: "Aaron Turner" <synfinatic () gmail com>
Cc: <tcpdump-workers () lists tcpdump org>
Sent: Tuesday, October 27, 2009 6:04 AM
Subject: Re: [tcpdump-workers] pcap_findalldevs() failing on FreeBSD 7.2


> Hello Aaron,
>
> 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.
> >
> > User has since switched to Linux which works fine, so more of a FYI
> > then anything.
>
> FWIW I noticed some problems with pcap_finalldevs() under Windows XP and 
> Vista with Winpcap-4.1beta5.

Does the same happen with WinPcap 4.1.1?

> Essentially pcap_findalldevs() can only be used once in an application. 
> The second time, pcap_findalldevs() will find nothing.
> Another problem that we noticed is that, sometimes, if you don't put some 
> delay between the calls to pcap_compile() within pcap_finalldevs() it will 
> crash...

Windows or Linux/freeBSD?

> Abdel.
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