86 lines
3.3 KiB
C++
86 lines
3.3 KiB
C++
// Basic Config
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#include "globals.h"
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#include "wifiscan.h"
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#include <esp_coexist.h>
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#include "coexist_internal.h"
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// Local logging tag
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static const char TAG[] = "wifi";
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TimerHandle_t WifiChanTimer;
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static wifi_country_t wifi_country = {WIFI_MY_COUNTRY, WIFI_CHANNEL_MIN,
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WIFI_CHANNEL_MAX, 100,
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WIFI_COUNTRY_POLICY_MANUAL};
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typedef struct {
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unsigned frame_ctrl : 16;
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unsigned duration_id : 16;
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uint8_t addr1[6]; // receiver address
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uint8_t addr2[6]; // sender address
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uint8_t addr3[6]; // filtering address
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unsigned sequence_ctrl : 16;
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uint8_t addr4[6]; // optional
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} wifi_ieee80211_mac_hdr_t;
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typedef struct {
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wifi_ieee80211_mac_hdr_t hdr;
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uint8_t payload[0]; // network data ended with 4 bytes csum (CRC32)
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} wifi_ieee80211_packet_t;
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// using IRAM_:ATTR here to speed up callback function
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IRAM_ATTR void wifi_sniffer_packet_handler(void *buff,
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wifi_promiscuous_pkt_type_t type) {
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const wifi_promiscuous_pkt_t *ppkt = (wifi_promiscuous_pkt_t *)buff;
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const wifi_ieee80211_packet_t *ipkt =
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(wifi_ieee80211_packet_t *)ppkt->payload;
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const wifi_ieee80211_mac_hdr_t *hdr = &ipkt->hdr;
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if ((cfg.rssilimit) &&
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(ppkt->rx_ctrl.rssi < cfg.rssilimit)) // rssi is negative value
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ESP_LOGD(TAG, "WiFi RSSI %d -> ignoring (limit: %d)", ppkt->rx_ctrl.rssi,
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cfg.rssilimit);
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else // count seen MAC
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mac_add((uint8_t *)hdr->addr2, ppkt->rx_ctrl.rssi, MAC_SNIFF_WIFI);
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}
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// Software-timer driven Wifi channel rotation callback function
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void switchWifiChannel(TimerHandle_t xTimer) {
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channel =
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(channel % WIFI_CHANNEL_MAX) + 1; // rotate channel 1..WIFI_CHANNEL_MAX
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esp_wifi_set_channel(channel, WIFI_SECOND_CHAN_NONE);
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}
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void wifi_sniffer_init(void) {
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wifi_init_config_t wificfg = WIFI_INIT_CONFIG_DEFAULT();
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wificfg.nvs_enable = 0; // we don't need any wifi settings from NVRAM
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wificfg.wifi_task_core_id = 0; // we want wifi task running on core 0
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// wifi_promiscuous_filter_t filter = {
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// .filter_mask = WIFI_PROMIS_FILTER_MASK_MGMT}; // only MGMT frames
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// .filter_mask = WIFI_PROMIS_FILTER_MASK_ALL}; // we use all frames
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wifi_promiscuous_filter_t filter = {.filter_mask =
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WIFI_PROMIS_FILTER_MASK_MGMT |
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WIFI_PROMIS_FILTER_MASK_DATA};
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ESP_ERROR_CHECK(esp_wifi_init(&wificfg)); // configure Wifi with cfg
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ESP_ERROR_CHECK(
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esp_wifi_set_country(&wifi_country)); // set locales for RF and channels
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ESP_ERROR_CHECK(
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esp_wifi_set_storage(WIFI_STORAGE_RAM)); // we don't need NVRAM
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ESP_ERROR_CHECK(esp_wifi_set_mode(WIFI_MODE_NULL));
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ESP_ERROR_CHECK(esp_wifi_set_ps(WIFI_PS_NONE)); // no modem power saving
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ESP_ERROR_CHECK(esp_wifi_start()); // channel switch throws error without
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ESP_ERROR_CHECK(esp_wifi_set_promiscuous_filter(&filter)); // set frame filter
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ESP_ERROR_CHECK(esp_wifi_set_promiscuous_rx_cb(&wifi_sniffer_packet_handler));
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ESP_ERROR_CHECK(esp_wifi_set_promiscuous(true)); // now switch on monitor mode
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// setup wifi channel rotation timer
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WifiChanTimer =
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xTimerCreate("WifiChannelTimer", pdMS_TO_TICKS(cfg.wifichancycle * 10),
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pdTRUE, (void *)0, switchWifiChannel);
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assert(WifiChanTimer);
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xTimerStart(WifiChanTimer, 0);
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} |