ESP32 WiFi MAC Scanner/Sniffer (promiscuous).

#include <WiFi.h>
#include <Wire.h>

#include "esp_wifi.h"

#include "SSD1306.h"
#include "SH1106.h"

String maclist[64][3]; 
int listcount = 0;

String KnownMac[10][2] = {  // Put devices you want to be reconized
  {"Will-Phone","EC1F7ffffffD"},
  {"Will-PC","E894Fffffff3"},
  {"NAME","MACADDRESS"},
  {"NAME","MACADDRESS"},
  {"NAME","MACADDRESS"},
  {"NAME","MACADDRESS"},
  {"NAME","MACADDRESS"},
  {"NAME","MACADDRESS"},
  {"NAME","MACADDRESS"}
  
};

String defaultTTL = "60"; // Maximum time (Apx seconds) elapsed before device is consirded offline

const wifi_promiscuous_filter_t filt={ //Idk what this does
    .filter_mask=WIFI_PROMIS_FILTER_MASK_MGMT|WIFI_PROMIS_FILTER_MASK_DATA
};

typedef struct { // or this
  uint8_t mac[6];
} __attribute__((packed)) MacAddr;

typedef struct { // still dont know much about this
  int16_t fctl;
  int16_t duration;
  MacAddr da;
  MacAddr sa;
  MacAddr bssid;
  int16_t seqctl;
  unsigned char payload[];
} __attribute__((packed)) WifiMgmtHdr;


  
#define maxCh 13 //max Channel -> US = 11, EU = 13, Japan = 14


int curChannel = 1;


void sniffer(void* buf, wifi_promiscuous_pkt_type_t type) { //This is where packets end up after they get sniffed
  wifi_promiscuous_pkt_t *p = (wifi_promiscuous_pkt_t*)buf; // Dont know what these 3 lines do
  int len = p->rx_ctrl.sig_len;
  WifiMgmtHdr *wh = (WifiMgmtHdr*)p->payload;
  len -= sizeof(WifiMgmtHdr);
  if (len < 0){
    Serial.println("Receuved 0");
    return;
  }
  String packet;
  String mac;
  int fctl = ntohs(wh->fctl);
  for(int i=8;i<=8+6+1;i++){ // This reads the first couple of bytes of the packet. This is where you can read the whole packet replaceing the "8+6+1" with "p->rx_ctrl.sig_len"
     packet += String(p->payload[i],HEX);
  }
  for(int i=4;i<=15;i++){ // This removes the 'nibble' bits from the stat and end of the data we want. So we only get the mac address.
    mac += packet[i];
  }
  mac.toUpperCase();

  
  int added = 0;
  for(int i=0;i<=63;i++){ // checks if the MAC address has been added before
    if(mac == maclist[i][0]){
      maclist[i][1] = defaultTTL;
      if(maclist[i][2] == "OFFLINE"){
        maclist[i][2] = "0";
      }
      added = 1;
    }
  }
  
  if(added == 0){ // If its new. add it to the array.
    maclist[listcount][0] = mac;
    maclist[listcount][1] = defaultTTL;
    //Serial.println(mac);
    listcount ++;
    if(listcount >= 64){
      Serial.println("Too many addresses");
      listcount = 0;
    }
  }
}



//===== SETUP =====//
void setup() {

  /* start Serial */
  Serial.begin(115200);
  setupOLED();

  /* setup wifi */
  wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT();
  esp_wifi_init(&cfg);
  esp_wifi_set_storage(WIFI_STORAGE_RAM);
  esp_wifi_set_mode(WIFI_MODE_NULL);
  esp_wifi_start();
  esp_wifi_set_promiscuous(true);
  esp_wifi_set_promiscuous_filter(&filt);
  esp_wifi_set_promiscuous_rx_cb(&sniffer);
  esp_wifi_set_channel(curChannel, WIFI_SECOND_CHAN_NONE);
  
  Serial.println("starting!");
}

void purge(){ // This maanges the TTL
  for(int i=0;i<=63;i++){
    if(!(maclist[i][0] == "")){
      int ttl = (maclist[i][1].toInt());
      ttl --;
      if(ttl <= 0){
        //Serial.println("OFFLINE: " + maclist[i][0]);
        maclist[i][2] = "OFFLINE";
        maclist[i][1] = defaultTTL;
      }else{
        maclist[i][1] = String(ttl);
      }
    }
  }
}

void updatetime(){ // This updates the time the device has been online for
  for(int i=0;i<=63;i++){
    if(!(maclist[i][0] == "")){
      if(maclist[i][2] == "")maclist[i][2] = "0";
      if(!(maclist[i][2] == "OFFLINE")){
          int timehere = (maclist[i][2].toInt());
          timehere ++;
          maclist[i][2] = String(timehere);
      }
      
      //Serial.println(maclist[i][0] + " : " + maclist[i][2]);
      
    }
  }
}

void showpeople(){ // This checks if the MAC is in the reckonized list and then displays it on the OLED and/or prints it to serial.
  String forScreen = "";
  for(int i=0;i<=63;i++){
    String tmp1 = maclist[i][0];
    if(!(tmp1 == "")){
      for(int j=0;j<=9;j++){
        String tmp2 = KnownMac[j][1];
        if(tmp1 == tmp2){
          forScreen += (KnownMac[j][0] + " : " + maclist[i][2] + "\n");
          Serial.print(KnownMac[j][0] + " : " + tmp1 + " : " + maclist[i][2] + "\n -- \n");
        }
      }
    }
  }
  update_screen_text(forScreen);
}

//===== LOOP =====//
void loop() {
    //Serial.println("Changed channel:" + String(curChannel));
    if(curChannel > maxCh){ 
      curChannel = 1;
    }
    esp_wifi_set_channel(curChannel, WIFI_SECOND_CHAN_NONE);
    delay(1000);
    updatetime();
    purge();
    showpeople();
    curChannel++;
    
    
}

// Looks like ill have to add the OLED in the same file.
// ----------------------------------- OLED FILE ---------------
// VVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVV
// This will all still work like it is, I just put this part in a differant tab.

#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SH1106.h>
#define OLED_SDA 5
#define OLED_SCL 4

const int available_lines = 8;
String textarray[available_lines];
int char_per_line = 21;

Adafruit_SH1106 display(OLED_SDA, OLED_SCL);

void setupOLED(){
  display.begin(SH1106_SWITCHCAPVCC, 0x3C); 
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.setCursor(0,0);
  display.display();
}


void writemsg(String msg){
  int msg_length = msg.length();;
  if(msg_length <= char_per_line){
    add_meg_to_array(msg);
  }else{
    int count = 0;
    int tmp_count = 0;
    String tmp;
    while(count <= msg_length){
      tmp += msg[count];
      tmp_count ++;
      count++;
      if(tmp_count >= char_per_line){
        add_meg_to_array(tmp);
        tmp_count = 0;
        tmp = "";
      }
    }
    if(tmp.length() >= 1){
      add_meg_to_array(tmp);
    }
  }
  update_screen();
}

void add_meg_to_array(String msg){
  for(int i=1; i <= available_lines ; i++){
    textarray[i-1] = textarray[i];
  }
  textarray[7] = msg;
}

void update_screen(){
  display.clearDisplay();
  display.setCursor(0,0);
  for(int i = 1; i <= 8 ; i++){
    display.println(textarray[i-1]);
  }
  display.display();
}

void update_screen_text(String msg){
  display.clearDisplay();
  display.setCursor(0,0);
  display.println(msg);
  display.display();
}


void clear_screen(){
  for(int i = 0; i <= available_lines - 1 ;i++){
    textarray[i] = "";
  }
  update_screen();
}