On Thu, Apr 25, 2002 at 11:20:32PM +0200, Floris 'Tamama' van Gog wrote:
> However i get the following response:
>
> $ ./testapp.exe
> Error opening device. (no suitable device found)
>
> when forcing the device to rl0 (my ethernet card) i get:
>
> $ ./testapp.exe
> Device: rl0
> could not open 'rl0'
>
> Any insight on how to solve this would be appreciated.
Step 1 would be to have the application report the *reason* why it
couldn't open the device:
// dev="rl0";
printf("Device: %s\n", dev);
handle = pcap_open_live(dev, BUFSIZ, 1, 0, errbuf);
if (!handle)
{
printf("could not open '%s': %s\n",dev, errbuf);
return 2;
}
although I suspect the reason is "you're not running it as root, and you
don't have read access to the '/dev/bpf' devices".
UNIXes generally require special privileges to capture packets. Some
UNIXes allow only the super-user to do so. The BSDs allow anybody who
can open the "/dev/bpf" devices, such as "/dev/bpf0", for reading to do
so.
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