Check for Wi-Fi interfaces and don't offer DOCSIS on them.

[libpcap] / pcap-linux.c

diff --git a/pcap-linux.c b/pcap-linux.c
index 32f5be663cd9bd4afb27a06ae43beaf22cea5f00..cae755f5e9ade2bedf336082af58628ce9262b52 100644 (file)
--- a/pcap-linux.c
+++ b/pcap-linux.c
@@ -2631,7 +2631,7 @@ static void map_arphrd_to_dlt(pcap_t *handle, int arptype, const char *device,
                }
        
                /*
-                * This is (presumably) a real Ethernet capture; give it a
+                * Is this a real Ethernet device?  If so, give it a
                 * link-layer-type list with DLT_EN10MB and DLT_DOCSIS, so
                 * that an application can let you choose it, in case you're
                 * capturing DOCSIS traffic that a Cisco Cable Modem
@@ -2645,16 +2645,27 @@ static void map_arphrd_to_dlt(pcap_t *handle, int arptype, const char *device,
                 * a Cisco CMTS won't put traffic onto it or get traffic
                 * bridged onto it?  ISDN is handled in "activate_new()",
                 * as we fall back on cooked mode there; are there any
-                * others?
+                * others, and we handle 802.11 devices by using
+                * pcap_can_set_rfmon_linux(); are there any others??
                 */
-               handle->dlt_list = (u_int *) malloc(sizeof(u_int) * 2);
-               /*
-                * If that fails, just leave the list empty.
-                */
-               if (handle->dlt_list != NULL) {
-                       handle->dlt_list[0] = DLT_EN10MB;
-                       handle->dlt_list[1] = DLT_DOCSIS;
-                       handle->dlt_count = 2;
+#ifdef IW_MODE_MONITOR
+               if (has_wext(handle->fd, device, handle->errbuf) != 1) {
+                       /*
+                        * It supports the wireless extensions, so it's a Wi-Fi
+                        * device; don't offer DOCSIS.
+                        */
+               } else
+#endif
+               {
+                       handle->dlt_list = (u_int *) malloc(sizeof(u_int) * 2);
+                       /*
+                        * If that fails, just leave the list empty.
+                        */
+                       if (handle->dlt_list != NULL) {
+                               handle->dlt_list[0] = DLT_EN10MB;
+                               handle->dlt_list[1] = DLT_DOCSIS;
+                               handle->dlt_count = 2;
+                       }
                }
                /* FALLTHROUGH */