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esppl_functions.h
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#include <ESP8266WiFi.h>
#include "./esppl_struct.h"
extern "C" {
#include "user_interface.h"
typedef void (*freedom_outside_cb_t)(uint8 status);
int wifi_register_send_pkt_freedom_cb(freedom_outside_cb_t cb);
void wifi_unregister_send_pkt_freedom_cb(void);
int wifi_send_pkt_freedom(uint8 *buf, int len, bool sys_seq);
}
uint8_t esppl_channel = ESPPL_CHANNEL_DEFAULT;
uint8_t esppl_default_mac[ESPPL_MAC_LEN] = {0x00,0x00,0x00,0x00,0x00,0x00};
ESPPL_CB_T user_cb;
int frame_waitlist = 0;
bool esppl_sniffing_enabled = false;
void esppl_buf_to_info(uint8_t *frame, signed rssi, uint16_t len);
/*
* Promiscuous RX callback function
*/
void esppl_rx_cb(uint8_t *buf, uint16_t len) {
if (len == sizeof(struct sniffer_buf2)) {
struct sniffer_buf2 *sniffer = (struct sniffer_buf2*) buf;
esppl_buf_to_info(sniffer->buf, sniffer->rx_ctrl.rssi, len);
} else if (len == sizeof(struct RxControl)) {
struct RxControl *sniffer = (struct RxControl*) buf;
} else {
struct sniffer_buf *sniffer = (struct sniffer_buf*) buf;
esppl_buf_to_info(sniffer->buf, sniffer->rx_ctrl.rssi, len);
}
}
/*
* buf to esppl_frame_info structure converter
*/
void esppl_buf_to_info(uint8_t *frame, signed rssi, uint16_t len) {
struct esppl_frame_info info;
uint8_t dstofrom;
uint8_t pos;
uint8_t parsecount;
if (esppl_sniffing_enabled) {
frame_waitlist++;
// - "Resets" some fields
memcpy(info.receiveraddr, esppl_default_mac, ESPPL_MAC_LEN);
memcpy(info.destinationaddr, esppl_default_mac, ESPPL_MAC_LEN);
memcpy(info.transmitteraddr, esppl_default_mac, ESPPL_MAC_LEN);
memcpy(info.sourceaddr, esppl_default_mac, ESPPL_MAC_LEN);
memcpy(info.bssid, esppl_default_mac, ESPPL_MAC_LEN);
info.ssid_length = 0;
info.isvalid = true;
info.channel = 0;
info.seq_num = 0;
// - Populates the fields
memcpy(info.raw, frame, len - 1);
info.raw_length = len;
info.frametype = (frame[0] & B00001100) >> 2;
info.framesubtype = (frame[0] & B11110000) >> 4;
info.rssi = rssi;
dstofrom = (frame[1] & 3);
switch (info.frametype) {
case ESPPL_CONTROL: // - Control Frames
switch (info.framesubtype) {
case ESPPL_CONTROL_RTS: // - RTS
memcpy(info.receiveraddr, frame + 4, ESPPL_MAC_LEN);
memcpy(info.destinationaddr, frame + 4, ESPPL_MAC_LEN); //?
memcpy(info.transmitteraddr, frame + 4 + ESPPL_MAC_LEN, ESPPL_MAC_LEN);
memcpy(info.sourceaddr, frame + 4 + ESPPL_MAC_LEN, ESPPL_MAC_LEN); //?
break;
case ESPPL_CONTROL_CTS: // - CTS
memcpy(info.receiveraddr, frame + 4, ESPPL_MAC_LEN);
memcpy(info.destinationaddr, frame + 4, ESPPL_MAC_LEN); //?
break;
case ESPPL_CONTROL_ACK: // - ACK
memcpy(info.receiveraddr, frame + 4, ESPPL_MAC_LEN);
memcpy(info.destinationaddr, frame + 4, ESPPL_MAC_LEN); //?
break;
case ESPPL_CONTROL_PS_POLL: // - PS-POLL
memcpy(info.receiveraddr, frame + 4, ESPPL_MAC_LEN);
memcpy(info.destinationaddr, frame + 4, ESPPL_MAC_LEN); //?
memcpy(info.bssid, frame + 4, ESPPL_MAC_LEN);
memcpy(info.transmitteraddr, frame + 4 + ESPPL_MAC_LEN, ESPPL_MAC_LEN);
memcpy(info.sourceaddr, frame + 4 + ESPPL_MAC_LEN, ESPPL_MAC_LEN); //?
break;
case ESPPL_CONTROL_CF_END: // - CF-END
memcpy(info.receiveraddr, frame + 4, ESPPL_MAC_LEN);
memcpy(info.destinationaddr, frame + 4, ESPPL_MAC_LEN);
memcpy(info.transmitteraddr, frame + 4 + ESPPL_MAC_LEN, ESPPL_MAC_LEN);
memcpy(info.sourceaddr, frame + 4 + ESPPL_MAC_LEN, ESPPL_MAC_LEN);
memcpy(info.bssid, frame + 4 + ESPPL_MAC_LEN, ESPPL_MAC_LEN);
break;
case ESPPL_CONTROL_CF_END_CF_ACK: // - CF-END+CF-ACK
memcpy(info.receiveraddr, frame + 4, ESPPL_MAC_LEN);
memcpy(info.destinationaddr, frame + 4, ESPPL_MAC_LEN);
memcpy(info.transmitteraddr, frame + 4 + ESPPL_MAC_LEN, ESPPL_MAC_LEN);
memcpy(info.sourceaddr, frame + 4 + ESPPL_MAC_LEN, ESPPL_MAC_LEN);
memcpy(info.bssid, frame + 4 + ESPPL_MAC_LEN, ESPPL_MAC_LEN);
break;
case ESPPL_CONTROL_BLOCK_ACK_REQUEST: // - BlockAckReq
memcpy(info.receiveraddr, frame + 4, ESPPL_MAC_LEN);
memcpy(info.destinationaddr, frame + 4, ESPPL_MAC_LEN);
memcpy(info.transmitteraddr, frame + 4 + ESPPL_MAC_LEN, ESPPL_MAC_LEN);
memcpy(info.sourceaddr, frame + 4 + ESPPL_MAC_LEN, ESPPL_MAC_LEN);
break;
case ESPPL_CONTROL_BLOCK_ACK: // - BlockAck
memcpy(info.receiveraddr, frame + 4, ESPPL_MAC_LEN);
memcpy(info.destinationaddr, frame + 4, ESPPL_MAC_LEN);
memcpy(info.transmitteraddr, frame + 4 + ESPPL_MAC_LEN, ESPPL_MAC_LEN);
memcpy(info.sourceaddr, frame + 4 + ESPPL_MAC_LEN, ESPPL_MAC_LEN);
break;
case ESPPL_CONTROL_CONTROL_WRAPPER: // - Control Wrapper
//TODO
break;
}
break;
case ESPPL_DATA: // - Data Frames
info.seq_num = frame[23] * 0xFF + (frame[22] & 0xF0);
switch (dstofrom) { // - ToDS FromDS
case ESPPL_DS_NO: // - ToDS=0 FromDS=0
memcpy(info.receiveraddr, frame + 4, ESPPL_MAC_LEN);
memcpy(info.destinationaddr, frame + 4, ESPPL_MAC_LEN);
memcpy(info.transmitteraddr, frame + 4 + ESPPL_MAC_LEN, ESPPL_MAC_LEN);
memcpy(info.sourceaddr, frame + 4 + ESPPL_MAC_LEN, ESPPL_MAC_LEN);
memcpy(info.bssid, frame + 4 + ESPPL_MAC_LEN * 2, ESPPL_MAC_LEN);
break;
case ESPPL_DS_TO: // - ToDS=1 FromDS=0
memcpy(info.receiveraddr, frame + 4, ESPPL_MAC_LEN);
memcpy(info.bssid, frame + 4, ESPPL_MAC_LEN);
memcpy(info.transmitteraddr, frame + 4 + ESPPL_MAC_LEN, ESPPL_MAC_LEN);
memcpy(info.sourceaddr, frame + 4 + ESPPL_MAC_LEN, ESPPL_MAC_LEN);
memcpy(info.destinationaddr, frame + 4 + ESPPL_MAC_LEN * 2, ESPPL_MAC_LEN); //MSDU
break;
case ESPPL_DS_FROM: // - ToDS=0 FromDS=1
memcpy(info.receiveraddr, frame + 4, ESPPL_MAC_LEN);
memcpy(info.destinationaddr, frame + 4, ESPPL_MAC_LEN);
memcpy(info.transmitteraddr, frame + 4 + ESPPL_MAC_LEN, ESPPL_MAC_LEN);
memcpy(info.bssid, frame + 4 + ESPPL_MAC_LEN, ESPPL_MAC_LEN);
memcpy(info.sourceaddr, frame + 4 + ESPPL_MAC_LEN * 2, ESPPL_MAC_LEN);
break;
case ESPPL_DS_TOFROM: // - ToDS=1 FromDS=1
memcpy(info.receiveraddr, frame + 4, ESPPL_MAC_LEN);
memcpy(info.transmitteraddr, frame + 4 + ESPPL_MAC_LEN, ESPPL_MAC_LEN);
memcpy(info.destinationaddr, frame + 4 + ESPPL_MAC_LEN * 2, ESPPL_MAC_LEN);
memcpy(info.sourceaddr, frame + 4 + ESPPL_MAC_LEN * 2 + 2, ESPPL_MAC_LEN);
break;
}
break;
case ESPPL_MANAGEMENT: // - Management Frames
switch (info.framesubtype) {
case ESPPL_MANAGEMENT_PROBE_RESPONSE:
case ESPPL_MANAGEMENT_BEACON:
// - Parses management frame body
info.seq_num = frame[23] * 0xFF + (frame[22] & 0xF0);
pos = ESPPL_MANAGEMENT_MAC_HEADER_SIZE;
parsecount = 0;
while (pos < len && parsecount < 4) {
switch (frame[pos]) {
case 0: // - SSID
info.ssid_length = frame[pos + 1];
if (info.ssid_length > 32 || info.ssid_length < 0) {
info.ssid_length = 0;
}
memcpy(info.ssid, frame + pos + 2, info.ssid_length);
break;
case 3: // - Channel
info.channel = (int) frame[pos + 2];
break;
default:
break;
}
parsecount++; // - Avoid bad parsing or infinite loop
pos += frame[pos + 1] + 2;
}
default:
break;
}
memcpy(info.receiveraddr, frame + 4, ESPPL_MAC_LEN);
memcpy(info.destinationaddr, frame + 4, ESPPL_MAC_LEN);
memcpy(info.transmitteraddr, frame + 4 + ESPPL_MAC_LEN, ESPPL_MAC_LEN);
memcpy(info.sourceaddr, frame + 4 + ESPPL_MAC_LEN, ESPPL_MAC_LEN);
memcpy(info.bssid, frame + 4 + ESPPL_MAC_LEN * 2, ESPPL_MAC_LEN);
break;
default:
info.isvalid = false; //TODO Proper checksum validation
}
// - User callback function
if (info.isvalid) {
user_cb(&info);
}
frame_waitlist--;
}
}
/*
* Change channel
*/
void esppl_set_channel(int channel) {
wifi_set_channel(channel);
esppl_channel = channel;
}
/*
* Allows some time to process the frames
*/
bool esppl_process_frames() {
delay(10);
return frame_waitlist != 0;
}
/*
* Initialization function
*/
void esppl_init(ESPPL_CB_T cb) {
user_cb = cb;
frame_waitlist = 0;
wifi_station_disconnect();
wifi_set_opmode(STATION_MODE);
wifi_set_channel(esppl_channel);
wifi_promiscuous_enable(false);
wifi_set_promiscuous_rx_cb(esppl_rx_cb);
wifi_promiscuous_enable(true);
esppl_sniffing_enabled = false;
}
/*
* Start sniffing
*/
void esppl_sniffing_start() {
esppl_sniffing_enabled = true;
}
/*
* Stop sniffing
*/
void esppl_sniffing_stop() {
esppl_sniffing_enabled = false;
}