src/utils_dns.c: Implemented a handler for `DLT_LINUX_SLL'.

This is the ``Linux cooked capture encapsulation'', which is at least returned
when capturing the `any' device under Linux. This patch will strip off the
header and pass the packet to the IPv4 or IPv6 handler, whichever one is
ppropriate.

diff --git a/src/utils_dns.c b/src/utils_dns.c
index 221bac4..e9aec38 100644 (file)
--- a/src/utils_dns.c
+++ b/src/utils_dns.c
@@ -599,6 +599,40 @@ handle_ether(const u_char * pkt, int len)
        return handle_ip((struct ip *) buf, len);
 }
 
+#ifdef DLT_LINUX_SLL
+static int
+handle_linux_sll (const u_char *pkt, int len)
+{
+    struct sll_header
+    {
+       uint16_t pkt_type;
+       uint16_t dev_type;
+       uint16_t addr_len;
+       uint8_t  addr[8];
+       uint16_t proto_type;
+    } *hdr;
+    uint16_t etype;
+
+    if (len < sizeof (struct sll_header))
+       return (0);
+
+    hdr  = (struct sll_header *) pkt;
+    pkt  = (u_char *) (hdr + 1);
+    len -= sizeof (struct sll_header);
+
+    etype = ntohs (hdr->proto_type);
+
+    if ((ETHERTYPE_IP != etype)
+           && (ETHERTYPE_IPV6 != etype))
+       return 0;
+
+    if (ETHERTYPE_IPV6 == etype)
+       return (handle_ipv6 ((struct ip6_hdr *) pkt, len));
+    else
+       return handle_ip((struct ip *) pkt, len);
+}
+#endif /* DLT_LINUX_SLL */
+
 /* public function */
 void handle_pcap(u_char *udata, const struct pcap_pkthdr *hdr, const u_char *pkt)
 {
@@ -631,6 +665,11 @@ void handle_pcap(u_char *udata, const struct pcap_pkthdr *hdr, const u_char *pkt
            status = handle_raw (pkt, hdr->caplen);
            break;
 #endif
+#ifdef DLT_LINUX_SLL
+       case DLT_LINUX_SLL:
+           status = handle_linux_sll (pkt, hdr->caplen);
+           break;
+#endif
        case DLT_NULL:
            status = handle_null (pkt, hdr->caplen);
            break;