int
btbb_pcap_append_packet(btbb_pcap_handle * h, const uint64_t ns,
const int8_t sigdbm, const int8_t noisedbm,
const uint32_t reflap, const uint8_t refuap,
const btbb_packet *pkt)
{
if (h && h->dumper) {
uint16_t flags = BREDR_DEWHITENED | BREDR_SIGPOWER_VALID |
((noisedbm < sigdbm) ? BREDR_NOISEPOWER_VALID : 0) |
((reflap != LAP_ANY) ? BREDR_REFLAP_VALID : 0) |
((refuap != UAP_ANY) ? BREDR_REFUAP_VALID : 0);
uint32_t caplen = (uint32_t) btbb_packet_get_payload_length(pkt);
uint8_t payload_bytes[caplen];
btbb_get_payload_packed( pkt, (char *) &payload_bytes[0] );
caplen = MIN(BREDR_MAX_PAYLOAD, caplen);
pcap_bredr_packet pcap_pkt;
assemble_pcapng_bredr_packet( &pcap_pkt,
0,
ns,
caplen,
btbb_packet_get_channel(pkt),
sigdbm,
noisedbm,
btbb_packet_get_ac_errors(pkt),
btbb_packet_get_transport(pkt),
btbb_packet_get_modulation(pkt),
0, /* TODO: corrected header bits */
0, /* TODO: corrected payload bits */
btbb_packet_get_lap(pkt),
reflap,
refuap,
btbb_packet_get_header_packed(pkt),
flags,
payload_bytes );
pcap_dump((u_char *)h->dumper, &pcap_pkt.pcap_header, (u_char *)&pcap_pkt.bredr_bb_header);
return 0;
}
return -PCAP_INVALID_HANDLE;
}
/* Sniff for LAPs. If a piconet is provided, use the given LAP to
* search for UAP.
*/
static void cb_br_rx(void* args, usb_pkt_rx *rx, int bank)
{
btbb_packet *pkt = NULL;
btbb_piconet *pn = (btbb_piconet *)args;
char syms[BANK_LEN * NUM_BANKS];
int i;
int8_t signal_level;
int8_t noise_level;
int8_t snr;
int offset;
uint32_t clkn;
uint32_t lap = LAP_ANY;
uint8_t uap = UAP_ANY;
/* Sanity check */
if (rx->channel > (NUM_BREDR_CHANNELS-1))
goto out;
/* Copy packet (for dump) */
memcpy(&usb_packets[bank], rx, sizeof(usb_pkt_rx));
unpack_symbols(rx->data, br_symbols[bank]);
/* Do analysis based on oldest packet */
rx = &usb_packets[ (bank+1) % NUM_BANKS ];
uint64_t nowns = now_ns_from_clk100ns( rx );
determine_signal_and_noise( rx, &signal_level, &noise_level );
snr = signal_level - noise_level;
/* WC4: use vm circbuf if target allows. This gets rid of this
* wrapped copy step. */
/* Copy 2 oldest banks of symbols for analysis. Packet may
* cross a bank boundary. */
for (i = 0; i < 2; i++)
memcpy(syms + i * BANK_LEN,
br_symbols[(i + 1 + bank) % NUM_BANKS],
BANK_LEN);
/* Look for packets with specified LAP, if given. Otherwise
* search for any packet. Also determine if UAP is known. */
if (pn) {
lap = btbb_piconet_get_flag(pn, BTBB_LAP_VALID) ? btbb_piconet_get_lap(pn) : LAP_ANY;
uap = btbb_piconet_get_flag(pn, BTBB_UAP_VALID) ? btbb_piconet_get_uap(pn) : UAP_ANY;
}
/* Pass packet-pointer-pointer so that
* packet can be created in libbtbb. */
offset = btbb_find_ac(syms, BANK_LEN, lap, max_ac_errors, &pkt);
if (offset < 0)
goto out;
/* Copy out remaining banks of symbols for full analysis. */
for (i = 1; i < NUM_BANKS; i++)
memcpy(syms + i * BANK_LEN,
br_symbols[(i + 1 + bank) % NUM_BANKS],
BANK_LEN);
/* Once offset is known for a valid packet, copy in symbols
* and other rx data. CLKN here is the 312.5us CLK27-0. The
* btbb library can shift it be CLK1 if needed. */
clkn = (rx->clkn_high << 20) + (le32toh(rx->clk100ns) + offset + 1562) / 3125;
btbb_packet_set_data(pkt, syms + offset, NUM_BANKS * BANK_LEN - offset,
rx->channel, clkn);
/* Dump to PCAP/PCAPNG if specified */
#if defined(USE_PCAP)
if (h_pcap_bredr) {
btbb_pcap_append_packet(h_pcap_bredr, nowns,
signal_level, noise_level,
lap, uap, pkt);
}
#endif
if (h_pcapng_bredr) {
btbb_pcapng_append_packet(h_pcapng_bredr, nowns,
signal_level, noise_level,
lap, uap, pkt);
}
/* When reading from file, caller will read
* systime before calling this routine, so do
* not overwrite. Otherwise, get current time. */
if (infile == NULL)
systime = time(NULL);
/* If dumpfile is specified, write out all banks to the
* file. There could be duplicate data in the dump if more
* than one LAP is found within the span of NUM_BANKS. */
if (dumpfile) {
for(i = 0; i < NUM_BANKS; i++) {
uint32_t systime_be = htobe32(systime);
if (fwrite(&systime_be,
sizeof(systime_be), 1,
dumpfile)
!= 1) {;}
if (fwrite(&usb_packets[(i + 1 + bank) % NUM_BANKS],
sizeof(usb_pkt_rx), 1, dumpfile)
!= 1) {;}
}
}
printf("systime=%u ch=%2d LAP=%06x err=%u clk100ns=%u clk1=%u s=%d n=%d snr=%d\n",
(int)systime,
btbb_packet_get_channel(pkt),
btbb_packet_get_lap(pkt),
btbb_packet_get_ac_errors(pkt),
rx->clk100ns,
btbb_packet_get_clkn(pkt),
signal_level,
noise_level,
snr);
i = btbb_process_packet(pkt, pn);
if(i < 0) {
follow_pn = pn;
stop_ubertooth = 1;
}
out:
if (pkt)
btbb_packet_unref(pkt);
}
