[Iftop-users] patch for FreeBSD tunnel interface

[Scott Bertilson]

It also adds support for the OpenBSD DLT_LOOP.  Based on handling of
these DLT types from tcpdump.c.


@@ -432,10 +432,15 @@
 static void handle_raw_packet(unsigned char* args, const struct
pcap_pkthdr* pkthdr, const unsigned char* packet)
 {
     handle_ip_packet((struct ip*)packet, -1);
 }

+static void handle_null_packet(unsigned char* args, const struct
pcap_pkthdr* pkthdr, const unsigned char* packet)
+{
+    handle_ip_packet((struct ip*)(packet+4), -1);
+}
+
 #ifdef DLT_PFLOG
 static void handle_pflog_packet(unsigned char* args, const struct
pcap_pkthdr* pkthdr, const unsigned char* packet)
 {
        register u_int length = pkthdr->len;
        u_int hdrlen;
@@ -680,13 +685,21 @@
 #ifdef DLT_PFLOG
     else if (dlt == DLT_PFLOG) {
                packet_handler = handle_pflog_packet;
     }
 #endif
-    else if(dlt == DLT_RAW || dlt == DLT_NULL) {
+    else if(dlt == DLT_RAW) {
         packet_handler = handle_raw_packet;
     }
+    else if(dlt == DLT_NULL) {
+        packet_handler = handle_null_packet;
+    }
+#ifdef DLT_LOOP
+    else if(dlt == DLT_LOOP) {
+        packet_handler = handle_null_packet;
+    }
+#endif
     else if(dlt == DLT_IEEE802) {
         packet_handler = handle_tokenring_packet;
     }
     else if(dlt == DLT_PPP) {
         packet_handler = handle_ppp_packet;