static void print_datalinks(const char *dev) {
int *linktypes;
int err, i, nlinktypes;
char errbuf[PCAP_ERRBUF_SIZE];
pcap_t *handle;
handle = pcap_create(dev, errbuf);
if(!handle)
return;
err = pcap_activate(handle);
if(err)
return;
nlinktypes = pcap_list_datalinks(handle, &linktypes);
if(nlinktypes > 0)
printf(" Linktypes:%s", options.verbose > 1 ? "\n" : " ");
if(options.verbose > 1)
for(i = 0; i < nlinktypes; ++i)
printf(" %-20s %s\n"
, pcap_datalink_val_to_name(linktypes[i])
, pcap_datalink_val_to_description(linktypes[i]));
else
for(i = 0; i < nlinktypes; ++i)
printf("%s%s", pcap_datalink_val_to_name(linktypes[i])
, i + 1 > nlinktypes ? ", " : "\n");
pcap_free_datalinks(linktypes);
pcap_close(handle);
}
static void
show_dlts_and_exit(pcap_t *pd)
{
int n_dlts;
int *dlts = 0;
const char *dlt_name;
n_dlts = pcap_list_datalinks(pd, &dlts);
if (n_dlts < 0)
error("%s", pcap_geterr(pd));
else if (n_dlts == 0 || !dlts)
error("No data link types.");
(void) fprintf(stderr, "Data link types (use option -y to set):\n");
while (--n_dlts >= 0) {
dlt_name = pcap_datalink_val_to_name(dlts[n_dlts]);
if (dlt_name != NULL) {
(void) fprintf(stderr, " %s (%s)", dlt_name,
pcap_datalink_val_to_description(dlts[n_dlts]));
/*
* OK, does tcpdump handle that type?
*/
if (lookup_printer(dlts[n_dlts]) == NULL)
(void) fprintf(stderr, " (not supported)");
putchar('\n');
} else {
(void) fprintf(stderr, " DLT %d (not supported)\n",
dlts[n_dlts]);
}
}
free(dlts);
exit(0);
}
static void
show_dlts_and_exit(const char *device, pcap_t *pd)
{
int n_dlts;
int *dlts = 0;
const char *dlt_name;
n_dlts = pcap_list_datalinks(pd, &dlts);
if (n_dlts < 0)
error("%s", pcap_geterr(pd));
else if (n_dlts == 0 || !dlts)
error("No data link types.");
/*
* If the interface is known to support monitor mode, indicate
* whether these are the data link types available when not in
* monitor mode, if -I wasn't specified, or when in monitor mode,
* when -I was specified (the link-layer types available in
* monitor mode might be different from the ones available when
* not in monitor mode).
*/
if (supports_monitor_mode)
(void) fprintf(stderr, "Data link types for %s %s (use option -y to set):\n",
device,
Iflag ? "when in monitor mode" : "when not in monitor mode");
else
(void) fprintf(stderr, "Data link types for %s (use option -y to set):\n",
device);
while (--n_dlts >= 0) {
dlt_name = pcap_datalink_val_to_name(dlts[n_dlts]);
if (dlt_name != NULL) {
(void) fprintf(stderr, " %s (%s)", dlt_name,
pcap_datalink_val_to_description(dlts[n_dlts]));
/*
* OK, does tcpdump handle that type?
*/
if (lookup_printer(dlts[n_dlts]) == NULL
&& lookup_ndo_printer(dlts[n_dlts]) == NULL)
(void) fprintf(stderr, " (printing not supported)");
putchar('\n');
} else {
(void) fprintf(stderr, " DLT %d (printing not supported)\n",
dlts[n_dlts]);
}
}
free(dlts);
exit(0);
}
