310 lines
10 KiB
Arduino
310 lines
10 KiB
Arduino
#include <WiFi.h>
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#include <WiFiUdp.h>
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#include "esp_efuse.h"
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#include "esp_mac.h"
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#include "config.h"
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#if PROBE_SNIFF
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#include "esp_wifi.h"
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#include "freertos/queue.h"
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#endif
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WiFiUDP udp;
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String nodeId;
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unsigned long lastScan = 0;
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unsigned long lastHeartbeat = 0;
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// ─── Probe sniffing globals ───────────────────────────────────────────────────
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#if PROBE_SNIFF
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struct ProbeEvent {
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uint8_t src_mac[6];
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char ssid[33];
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int8_t rssi;
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};
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static QueueHandle_t probeQueue;
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// Dedup cache — suppress repeated MAC+SSID pairs within PROBE_DEDUP_SECS
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struct DedupEntry { uint8_t mac[6]; char ssid[33]; uint32_t last_ms; };
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static DedupEntry dedupCache[32];
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static int dedupNext = 0;
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static bool isDuplicate(const uint8_t* mac, const char* ssid) {
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uint32_t now = millis();
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for (int i = 0; i < 32; i++) {
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if (dedupCache[i].last_ms == 0) continue;
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if (memcmp(dedupCache[i].mac, mac, 6) == 0 &&
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strcmp(dedupCache[i].ssid, ssid) == 0) {
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if ((now - dedupCache[i].last_ms) < (uint32_t)(PROBE_DEDUP_SECS * 1000))
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return true;
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dedupCache[i].last_ms = now;
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return false;
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}
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}
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// Not found — write to next slot (ring)
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memcpy(dedupCache[dedupNext].mac, mac, 6);
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strncpy(dedupCache[dedupNext].ssid, ssid, 32);
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dedupCache[dedupNext].ssid[32] = '\0';
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dedupCache[dedupNext].last_ms = now;
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dedupNext = (dedupNext + 1) % 32;
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return false;
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}
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// Promiscuous callback — runs in WiFi task context, not safe to call UDP here.
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// Parse probe request frames and push to queue for the main loop to send.
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static void promiscuous_rx_cb(void* buf, wifi_promiscuous_pkt_type_t type) {
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if (type != WIFI_PKT_MGMT) return;
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const wifi_promiscuous_pkt_t* pkt = (const wifi_promiscuous_pkt_t*)buf;
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const uint8_t* d = pkt->payload;
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uint16_t len = pkt->rx_ctrl.sig_len;
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if (len < 28) return;
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if (d[0] != 0x40) return; // byte 0 = 0x40 → management, probe request subtype
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const uint8_t* src = d + 10; // source address at bytes 10–15
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// Parse SSID tag (tag 0) from frame body starting at byte 24
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char ssid[33] = "";
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if (d[24] == 0x00) {
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uint8_t slen = d[25];
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if (slen > 0 && slen <= 32 && (26 + slen) <= len) {
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bool printable = true;
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for (uint8_t i = 0; i < slen; i++) {
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if (d[26 + i] < 32 || d[26 + i] > 126) { printable = false; break; }
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}
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if (printable) { memcpy(ssid, d + 26, slen); ssid[slen] = '\0'; }
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}
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}
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if (isDuplicate(src, ssid)) return;
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ProbeEvent ev;
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memcpy(ev.src_mac, src, 6);
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memcpy(ev.ssid, ssid, 33);
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ev.rssi = (int8_t)pkt->rx_ctrl.rssi;
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xQueueSend(probeQueue, &ev, 0); // 0 timeout: drop if queue full
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}
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#endif // PROBE_SNIFF
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// ─── Setup ───────────────────────────────────────────────────────────────────
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void setup() {
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Serial.begin(115200);
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delay(500);
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// Derive node ID from MAC (last 4 bytes, no colons)
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uint8_t mac[6];
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esp_efuse_mac_get_default(mac);
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char macBuf[9];
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snprintf(macBuf, sizeof(macBuf), "%02X%02X%02X%02X", mac[2], mac[3], mac[4], mac[5]);
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nodeId = String(macBuf);
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Serial.printf("\n[NODE] ID: %s\n", nodeId.c_str());
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connectWiFi();
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#if PROBE_SNIFF
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memset(dedupCache, 0, sizeof(dedupCache));
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probeQueue = xQueueCreate(PROBE_QUEUE_SIZE, sizeof(ProbeEvent));
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esp_wifi_set_promiscuous_rx_cb(promiscuous_rx_cb);
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esp_wifi_set_promiscuous(true);
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Serial.println("[PROBE] Promiscuous mode enabled");
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#endif
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}
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// ─── Loop ────────────────────────────────────────────────────────────────────
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void loop() {
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if (WiFi.status() != WL_CONNECTED) {
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Serial.println("[WIFI] Lost connection, reconnecting...");
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connectWiFi();
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return;
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}
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unsigned long now = millis();
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if (now - lastHeartbeat >= HEARTBEAT_INTERVAL_MS) {
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lastHeartbeat = now;
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sendHeartbeat();
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}
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if (now - lastScan >= SCAN_INTERVAL_MS) {
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lastScan = now;
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scanAndSend();
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}
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delay(100);
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}
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// ─── WiFi ────────────────────────────────────────────────────────────────────
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void connectWiFi() {
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Serial.printf("[WIFI] Connecting to %s\n", WIFI_SSID);
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WiFi.mode(WIFI_STA);
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WiFi.begin(WIFI_SSID, WIFI_PASSWORD);
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int attempts = 0;
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while (WiFi.status() != WL_CONNECTED && attempts < 20) {
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delay(500);
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Serial.print(".");
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attempts++;
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}
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if (WiFi.status() == WL_CONNECTED) {
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Serial.printf("\n[WIFI] Connected — IP: %s\n", WiFi.localIP().toString().c_str());
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} else {
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Serial.println("\n[WIFI] Failed to connect, will retry in loop");
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}
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}
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// ─── Scan ────────────────────────────────────────────────────────────────────
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void scanAndSend() {
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Serial.println("[SCAN] Starting...");
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int n = WiFi.scanNetworks(false, true); // async=false, show_hidden=true
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if (n == WIFI_SCAN_FAILED) {
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Serial.println("[SCAN] Failed");
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return;
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}
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Serial.printf("[SCAN] Found %d networks\n", n);
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for (int i = 0; i < n; i++) {
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sendBeaconEvent(i);
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}
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WiFi.scanDelete();
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#if PROBE_SNIFF
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// Scan may have disabled promiscuous mode internally — re-enable it.
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esp_wifi_set_promiscuous(true);
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flushProbeQueue();
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#endif
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}
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// ─── Event helpers ───────────────────────────────────────────────────────────
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const char* encStr(wifi_auth_mode_t enc) {
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switch (enc) {
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case WIFI_AUTH_OPEN: return "OPEN";
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case WIFI_AUTH_WEP: return "WEP";
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case WIFI_AUTH_WPA_PSK: return "WPA";
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case WIFI_AUTH_WPA2_PSK: return "WPA2";
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case WIFI_AUTH_WPA_WPA2_PSK: return "WPA/WPA2";
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case WIFI_AUTH_WPA3_PSK: return "WPA3";
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case WIFI_AUTH_WPA2_WPA3_PSK: return "WPA2/WPA3";
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default: return "UNKNOWN";
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}
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}
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const char* importance(int rssi) {
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if (rssi >= -50) return "high";
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if (rssi <= -80) return "low";
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return "normal";
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}
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// ─── Send ────────────────────────────────────────────────────────────────────
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void sendBeaconEvent(int idx) {
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String ssid = WiFi.SSID(idx);
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ssid.replace("\"", "\\\""); // escape quotes for JSON
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String bssid = WiFi.BSSIDstr(idx);
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int rssi = WiFi.RSSI(idx);
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int ch = WiFi.channel(idx);
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const char* enc = encStr(WiFi.encryptionType(idx));
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const char* imp = importance(rssi);
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unsigned long ts = millis();
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char buf[512];
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snprintf(buf, sizeof(buf),
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"{\"node_id\":\"%s\",\"ts\":%lu,\"type\":\"beacon\","
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"\"conf\":\"high\",\"imp\":\"%s\","
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"\"ssid\":\"%s\",\"bssid\":\"%s\","
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"\"rssi\":%d,\"ch\":%d,\"enc\":\"%s\"}",
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nodeId.c_str(), ts, imp,
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ssid.c_str(), bssid.c_str(),
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rssi, ch, enc
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);
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udp.beginPacket(COORDINATOR_IP, COORDINATOR_PORT);
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udp.print(buf);
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udp.endPacket();
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Serial.printf(" → %-32s %s ch%-3d %4ddBm %s\n",
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ssid.c_str(), bssid.c_str(), ch, rssi, enc);
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}
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// ─── Heartbeat ───────────────────────────────────────────────────────────────
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void sendHeartbeat() {
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char buf[256];
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snprintf(buf, sizeof(buf),
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"{\"node_id\":\"%s\",\"ts\":%lu,\"type\":\"heartbeat\","
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"\"uptime_ms\":%lu,\"free_heap\":%lu,\"wifi_rssi\":%d}",
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nodeId.c_str(), millis(),
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millis(),
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(unsigned long)ESP.getFreeHeap(),
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WiFi.RSSI()
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);
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udp.beginPacket(COORDINATOR_IP, COORDINATOR_PORT);
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udp.print(buf);
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udp.endPacket();
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Serial.printf("[HB] uptime=%lus heap=%luK ap=%ddBm\n",
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millis() / 1000,
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(unsigned long)ESP.getFreeHeap() / 1024,
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WiFi.RSSI()
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);
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}
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// ─── Probe send / flush ───────────────────────────────────────────────────────
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#if PROBE_SNIFF
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void sendProbeEvent(const ProbeEvent& ev) {
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char mac_str[18];
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snprintf(mac_str, sizeof(mac_str), "%02X:%02X:%02X:%02X:%02X:%02X",
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ev.src_mac[0], ev.src_mac[1], ev.src_mac[2],
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ev.src_mac[3], ev.src_mac[4], ev.src_mac[5]);
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// Escape any quotes in SSID
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char ssidEsc[66];
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int j = 0;
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for (int i = 0; ev.ssid[i] && j < 64; i++) {
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if (ev.ssid[i] == '"' || ev.ssid[i] == '\\') ssidEsc[j++] = '\\';
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ssidEsc[j++] = ev.ssid[i];
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}
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ssidEsc[j] = '\0';
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char buf[256];
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snprintf(buf, sizeof(buf),
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"{\"node_id\":\"%s\",\"ts\":%lu,\"type\":\"probe\","
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"\"conf\":\"high\",\"imp\":\"%s\","
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"\"src_mac\":\"%s\",\"ssid\":\"%s\",\"rssi\":%d}",
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nodeId.c_str(), millis(), importance(ev.rssi),
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mac_str, ssidEsc, (int)ev.rssi
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);
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udp.beginPacket(COORDINATOR_IP, COORDINATOR_PORT);
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udp.print(buf);
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udp.endPacket();
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Serial.printf(" [PROBE] %s → \"%s\" %ddBm\n",
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mac_str, ev.ssid[0] ? ev.ssid : "<wildcard>", (int)ev.rssi);
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}
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void flushProbeQueue() {
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if (WiFi.status() != WL_CONNECTED) return;
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ProbeEvent ev;
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while (xQueueReceive(probeQueue, &ev, 0) == pdTRUE) {
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sendProbeEvent(ev);
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}
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}
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#endif // PROBE_SNIFF
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