Re: code available: netmap support for libpcap

[Guy Harris <guy () alum mit edu>]

On Feb 15, 2014, at 12:17 PM, Luigi Rizzo <rizzo () iet unipi it> wrote:

> +     p->linktype = DLT_EN10MB;

So this either

        1) only works on Ethernet devices and devices that supply Ethernet headers

or

        2) generates Ethernet headers that replace the native link-layer headers for devices that don't supply Ethernet 
headers?

> @@ -307,6 +311,9 @@ struct capture_source_type {
>       int (*findalldevs_op)(pcap_if_t **, char *);
>       pcap_t *(*create_op)(const char *, char *, int *);
> } capture_source_types[] = {
> +#ifdef PCAP_SUPPORT_NETMAP
> +     { NULL, pcap_netmap_create },
> +#endif
> #ifdef HAVE_DAG_API
>       { dag_findalldevs, dag_create },
> #endif

This means that "tcpdump -D/tshark -D" and the Wireshark GUI won't show netmap or vale devices; for command-line tools, 
this means you have to enter those devices manually, but it might make it impossible to capture on those devices in the 
Wireshark GUI.

Can you enumerate the netmap and vale devices?  If so, you should have a findalldevs routine.

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