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Increased capture length and adjusted 802.11 header length for radiotap

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This commit is contained in:
pdw
2011-10-04 18:30:59 +00:00
parent ac177644c3
commit 093c15f72f
2 changed files with 6 additions and 5 deletions
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2
ether.h
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@@ -28,6 +28,6 @@ struct radiotap_header {
u_int8_t it_pad;
u_int16_t it_len; /* entire length */
u_int32_t it_present; /* fields present */
};
} __attribute__((packed));
#endif

9
iftop.c
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@@ -86,9 +86,10 @@ static void finish(int sig) {
* bytes of tcp/udp header */
/* Increase with a further 20 to account for IPv6 header length. */
/* IEEE 802.11 radiotap throws in a variable length header plus 8 (radiotap
* header header) plus 30 (802.11 MAC) plus 40 (IPv6) = 78, plus whatever's in
* header header) plus 34 (802.11 MAC) plus 40 (IPv6) = 78, plus whatever's in
* the radiotap payload */
#define CAPTURE_LENGTH 92
/*#define CAPTURE_LENGTH 92 */
#define CAPTURE_LENGTH 256
void init_history() {
history = addr_hash_create();
@@ -612,9 +613,9 @@ static void handle_eth_packet(unsigned char* args, const struct pcap_pkthdr* pkt
*/
static void handle_radiotap_packet(unsigned char* args, const struct pcap_pkthdr* pkthdr, const unsigned char* packet)
{
/* 802.11 MAC header is = 30 bytes */
/* 802.11 MAC header is = 34 bytes (not sure if that's universally true) */
/* We could try harder to figure out hardware direction from the MAC header */
handle_ip_packet((struct ip*)(packet + ((struct radiotap_header *)packet)->it_len + 30),-1);
handle_ip_packet((struct ip*)(packet + ((struct radiotap_header *)packet)->it_len + 34),-1);
}