Yeah this is true,
however you could try a simple loop on the interface, If there are NULL you
must run as root.
/* Retrieve the device list on the local machine */
if (pcap_findalldevs(&alldevs, errbuf) == -1) {
printf("Error in pcap_findalldevs: %s\n", errbuf);
return -1;
}
for(d=alldevs; d; d=d->next)
{
printf("\t%d. %s\n", ++i, d->name);
#ifdef WIN32
if (d->description)
printf(" (%s)\n", d->description);
else
printf(" (No description available)\n");
#endif
}
if (i==0)
{
#ifdef WIN32
fprintf(stderr," \tNo interfaces found! Exiting.\n");
#else
fprintf(stderr," \tThis software must be run as root: No interfaces
found!");
#endif
exit(EXIT_FAILURE);
}
--
Benoit RAT
www.neub.co.nr
On Mon, Feb 2, 2009 at 2:39 PM, Johan Mazel <johan.ma...@gmail.com> wrote:
> Hi
> I'm trying to use pcap_findalldevs in order to scan the device available on
> my host to capture.
>
> My code (in C++) looks like that:
> result = pcap_findalldevs(&found_devices, errbuf);
> if(result < 0)
> {
> FindAllDevsException myFindAllDevsException(errbuf);
> cout << "Scan error" << endl;
> throw(myFindAllDevsException);
> }
>
> My problem is that when I'm not running the program as root, I got the
> "Erreur de bus" in French (or "Bus Error" in english I guess) and my
> program
> suddenly stops.
> And it looks like I cannot catch the error through the value of result.
>
> The pcap manpage say for pcap_findalldevs:
> -1 is returned on failure, in which case errbuf is filled in with an
> appropriate error message; 0 is returned on success.
> Apparently, this case of failure do not include the fact that the program
> might not be runned as root.
>
> My question is the following one, is there anyway to catch this error ?
>
> Thanks in adavnce for the help.
> Johan
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