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functions.ino
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functions.ino
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//parse out details of client frame
struct clientinfo parse_data(uint8_t *frame, uint16_t framelen, signed rssi, unsigned channel)
{
// takes 36 byte frame control frame
struct clientinfo ci;
ci.channel = channel;
ci.err = 0;
ci.rssi = rssi;
ci.header = frame[0];
ci.last_heard = millis() / 1000;
ci.reported = 0;
//int pos = 36;
uint8_t *bssid;
uint8_t *station;
uint8_t *ap;
uint8_t ds;
ds = frame[1] & 3; //Set first 6 bits to 0
switch (ds) {
// p[1] - xxxx xx00 => NoDS p[4]-DST p[10]-SRC p[16]-BSS
case 0:
bssid = frame + 16;
station = frame + 10;
ap = frame + 4;
break;
// p[1] - xxxx xx01 => ToDS p[4]-BSS p[10]-SRC p[16]-DST
case 1:
bssid = frame + 4;
station = frame + 10;
ap = frame + 16;
break;
// p[1] - xxxx xx10 => FromDS p[4]-DST p[10]-BSS p[16]-SRC
case 2:
bssid = frame + 10;
// hack - don't know why it works like this...
if (memcmp(frame + 4, broadcast1, 3) || memcmp(frame + 4, broadcast2, 3) || memcmp(frame + 4, broadcast3, 3)) {
station = frame + 16;
ap = frame + 4;
} else {
station = frame + 4;
ap = frame + 16;
}
break;
// p[1] - xxxx xx11 => WDS p[4]-RCV p[10]-TRM p[16]-DST p[26]-SRC
case 3:
bssid = frame + 10;
station = frame + 4;
ap = frame + 4;
break;
}
memcpy(ci.station, station, ETH_MAC_LEN);
memcpy(ci.bssid, bssid, ETH_MAC_LEN);
memcpy(ci.ap, ap, ETH_MAC_LEN);
ci.seq_n = frame[23] * 0xFF + (frame[22] & 0xF0);
return ci;
}
struct beaconinfo parse_beacon(uint8_t *frame, uint16_t framelen, signed rssi)
{
// takes 112 byte beacon frame
struct beaconinfo bi;
bi.ssid_len = 0;
bi.channel = 0;
bi.err = 0;
bi.rssi = rssi;
bi.last_heard = millis() / 1000;
bi.reported = 0;
bi.header = frame[0];
int pos = 36;
uint8_t frame_type = (frame[0] & 0x0C) >> 2;
uint8_t frame_subtype = (frame[0] & 0xF0) >> 4;
if (frame[pos] == 0x00) {
while (pos < framelen) {
switch (frame[pos]) {
case 0x00: //SSID
bi.ssid_len = (int) frame[pos + 1];
if (bi.ssid_len == 0) {
memset(bi.ssid, '\x00', 33);
break;
}
if (bi.ssid_len < 0) {
bi.err = -1;
break;
}
if (bi.ssid_len > 32) {
bi.err = -2;
break;
}
memset(bi.ssid, '\x00', 33);
memcpy(bi.ssid, frame + pos + 2, bi.ssid_len);
bi.err = 0; // before was error??
break;
case 0x03: //Channel
bi.channel = (int) frame[pos + 2];
pos = -1;
break;
default:
break;
}
if (pos < 0) break;
pos += (int) frame[pos + 1] + 2;
}
} else {
bi.err = -3;
}
bi.capa[0] = frame[34];
bi.capa[1] = frame[35];
memcpy(bi.bssid, frame + 10, ETH_MAC_LEN);
return bi;
};
struct probeinfo parse_probe(uint8_t *frame, uint16_t framelen, signed rssi)
{
// takes 112 byte probe request frame
struct probeinfo pi;
pi.ssid_len = 0;
pi.channel = 0;
pi.err = 0;
pi.rssi = rssi;
pi.last_heard = millis() / 1000;
pi.reported = 0;
pi.header = frame[0];
int pos = 24;
uint8_t frame_type = (frame[0] & 0x0C) >> 2;
uint8_t frame_subtype = (frame[0] & 0xF0) >> 4;
if (frame[pos] == 0x00) {
pi.ssid_len = (int) frame[pos + 1];
if (pi.ssid_len == 0) {
memset(pi.ssid, '\x00', 33);
}
if (pi.ssid_len < 0) {
pi.err = -1;
}
if (pi.ssid_len > 32) {
pi.err = -2;
}
memset(pi.ssid, '\x00', 33);
memcpy(pi.ssid, frame + pos + 2, pi.ssid_len);
pi.err = 0; // before was error??
} else {
pi.err = -3;
}
if (pi.err != 0) {
Serial.printf("Error parsing PROBE %d", (int)pi.err);
}
memcpy(pi.ap, frame + 4, ETH_MAC_LEN);
memcpy(pi.station, frame + 10, ETH_MAC_LEN);
memcpy(pi.bssid, frame + 16, ETH_MAC_LEN);
return pi;
}
int register_beacon(beaconinfo beacon)
{
// add beacon to list if not already included
int known = 0; // Clear known flag
for (int u = 0; u < aps_known_count; u++)
{
if (! memcmp(aps_known[u].bssid, beacon.bssid, ETH_MAC_LEN)) {
known = 1;
aps_known[u].last_heard = beacon.last_heard;
break;
} // AP known => Set known flag
}
if (! known) // AP is NEW, copy MAC to array and return it
{
memcpy(&aps_known[aps_known_count], &beacon, sizeof(beacon));
aps_known_count++;
if ((unsigned int) aps_known_count >=
sizeof (aps_known) / sizeof (aps_known[0]) ) {
Serial.printf("exceeded max aps_known\n");
aps_known_count = 0;
}
}
return known;
}
int register_client(clientinfo ci)
{
// add client to list if not already included
int known = 0; // Clear known flag
for (int u = 0; u < clients_known_count; u++)
{
if (! memcmp(clients_known[u].station, ci.station, ETH_MAC_LEN)) {
known = 1;
clients_known[u].last_heard = ci.last_heard;
break;
}
}
if (! known)
{
memcpy(&clients_known[clients_known_count], &ci, sizeof(ci));
clients_known_count++;
if ((unsigned int) clients_known_count >=
sizeof (clients_known) / sizeof (clients_known[0]) ) {
Serial.printf("exceeded max clients_known\n");
clients_known_count = 0;
}
}
return known;
}
int register_probe(probeinfo pi)
{
//add probe to list if not already included.
int known = 0; // Clear known flag
for (int u = 0; u < probes_known_count; u++)
{
if ((memcmp(probes_known[u].station, pi.station, ETH_MAC_LEN) == 0)
&& (memcmp(probes_known[u].bssid, pi.bssid, ETH_MAC_LEN) == 0 )
&& (strncmp((char*)probes_known[u].ssid, (char*)pi.ssid, sizeof(pi.ssid)) == 0 )) {
known = 1;
probes_known[u].last_heard = pi.last_heard;
break;
}
}
if (! known)
{
memcpy(&probes_known[probes_known_count], &pi, sizeof(pi));
probes_known_count++;
if ((unsigned int) probes_known_count >=
sizeof (probes_known) / sizeof (probes_known[0]) ) {
Serial.printf("exceeded max probes_known\n");
probes_known_count = 0;
}
}
return known;
}
void print_client(clientinfo ci)
{
int u = 0;
int known = 0; // Clear known flag
uint64_t now = millis() / 1000;
if (ci.err != 0) {
Serial.printf("ci.err %02d", ci.err);
Serial.printf("\r\n");
} else {
Serial.printf("DEVICE: ");
for (int i = 0; i < 6; i++) Serial.printf("%02x", ci.station[i]);
Serial.printf(" ==> ");
for (u = 0; u < aps_known_count; u++)
{
if (! memcmp(aps_known[u].bssid, ci.bssid, ETH_MAC_LEN)) {
Serial.printf("[%32s] ", aps_known[u].ssid);
known = 1; // AP known => Set known flag
break;
}
}
if (! known) {
Serial.printf("[%32s] ", "??");
};
for (int i = 0; i < 6; i++) Serial.printf("%02x", ci.bssid[i]);
Serial.printf(" %3d", ci.channel);
Serial.printf(" %d", (now - ci.last_heard));
Serial.printf(" %d", (ci.reported));
Serial.printf(" %4d\r\n", ci.rssi);
}
}
void promisc_cb(uint8_t *buf, uint16_t len)
{
if (len == 12) {
struct RxControl *sniffer = (struct RxControl*) buf;
} else if (len == 128) {
uint8_t frame_control_pkt = buf[12]; // just after the RxControl Structure
uint8_t frame_type = (frame_control_pkt & 0x0C) >> 2;
uint8_t frame_subtype = (frame_control_pkt & 0xF0) >> 4;
struct sniffer_buf2 *sniffer = (struct sniffer_buf2*) buf;
if (frame_type == 0 && (frame_subtype == 8 || frame_subtype == 5))
{
struct beaconinfo beacon = parse_beacon(sniffer->buf, 112, sniffer->rx_ctrl.rssi);
if (register_beacon(beacon) == 0)
{
nothing_new = 0;
};
} else if (frame_type == 0 && frame_subtype == 4) {
struct probeinfo probe = parse_probe(sniffer->buf, 112, sniffer->rx_ctrl.rssi);
if (register_probe(probe) == 0)
{
nothing_new = 0;
};
} else {
// Unknown packet
};
} else {
struct sniffer_buf *sniffer = (struct sniffer_buf*) buf;
struct clientinfo ci = parse_data(sniffer->buf, 36, sniffer->rx_ctrl.rssi, sniffer->rx_ctrl.channel);
if (register_client(ci) == 0) {
print_client(ci);
nothing_new = 0;
}
}
}