Clawdia
280 lines
9.0 KiB
C
280 lines
9.0 KiB
C
/*
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* CITS Sniffer - Optimized for ESP32-C5 (ITS-G5 / 802.11p)
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* Final Stable Version: Focus on Memory Safety and Buffer Ownership
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*/
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#include <string.h>
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#include <stdlib.h>
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#include "argtable3/argtable3.h"
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#include "freertos/FreeRTOS.h"
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#include "freertos/task.h"
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#include "freertos/queue.h"
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#include "freertos/semphr.h"
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#include <sys/unistd.h>
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#include <sys/fcntl.h>
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#include "esp_log.h"
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#include "esp_console.h"
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#include "esp_app_trace.h"
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#include "cmd_sniffer.h"
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#include "cmd_pcap.h"
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#include "esp_check.h"
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#include "sdkconfig.h"
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// PHY-Layer Prototypes
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extern void phy_11p_set(int mode, int param);
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extern void phy_change_channel(uint32_t freq, int mode, int param1, int param2);
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#define SNIFFER_DEFAULT_CHANNEL (5900)
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#define SNIFFER_PAYLOAD_FCS_LEN (4)
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#define SNIFFER_PROCESS_PACKET_TIMEOUT_MS (100)
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#define SNIFFER_MAX_ETH_INTFS (3)
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#define SNIFFER_DECIMAL_NUM (10)
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static const char *SNIFFER_TAG = "cmd_sniffer";
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typedef struct {
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char *filter_name;
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uint32_t filter_val;
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} its_g5_filter_table_t;
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typedef struct {
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bool is_running;
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sniffer_intf_t interf;
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uint32_t interf_num;
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uint32_t channel;
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uint32_t filter;
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int32_t packets_to_sniff;
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TaskHandle_t task;
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QueueHandle_t work_intf_queue;
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SemaphoreHandle_t sem_task_over;
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esp_eth_handle_t eth_handles[SNIFFER_MAX_ETH_INTFS];
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} sniffer_runtime_t;
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typedef struct {
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void *payload;
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uint32_t length;
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uint32_t seconds;
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uint32_t microseconds;
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} sniffer_packet_info_t;
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static sniffer_runtime_t snf_rt = {0};
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static its_g5_filter_table_t its_g5_filter_hash_table[SNIFFER_WLAN_FILTER_MAX] = {0};
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static esp_err_t sniffer_stop(sniffer_runtime_t *sniffer);
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static uint32_t hash_func(const char *str, uint32_t max_num)
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{
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uint32_t ret = 0;
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const char *p = str;
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while (*p) {
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ret += (uint32_t)(*p);
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p++;
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}
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return ret % max_num;
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}
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static void create_its_g5_filter_hashtable(void)
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{
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char *filters[] = {"pan_id", "p_control", "freq_offset"};
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uint32_t values[] = {0x1234, 0x01, 0x00};
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for (int i = 0; i < 3; i++) {
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uint32_t idx = hash_func(filters[i], SNIFFER_WLAN_FILTER_MAX);
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while (its_g5_filter_hash_table[idx].filter_name) {
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idx = (idx + 1) % SNIFFER_WLAN_FILTER_MAX;
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}
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its_g5_filter_hash_table[idx].filter_name = filters[i];
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its_g5_filter_hash_table[idx].filter_val = values[i];
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}
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}
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static uint32_t search_its_g5_filter_hashtable(const char *key)
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{
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if (!key) return 0;
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uint32_t len = strlen(key);
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uint32_t start_idx = hash_func(key, SNIFFER_WLAN_FILTER_MAX);
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uint32_t idx = start_idx;
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while (its_g5_filter_hash_table[idx].filter_name) {
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if (strncmp(its_g5_filter_hash_table[idx].filter_name, key, len) == 0) {
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return its_g5_filter_hash_table[idx].filter_val;
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}
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idx = (idx + 1) % SNIFFER_WLAN_FILTER_MAX;
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if (idx == start_idx) break;
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}
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return 0;
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}
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static void queue_packet_safe(void *recv_packet, uint32_t length)
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{
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if (!recv_packet || length == 0) return;
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sniffer_packet_info_t packet_info;
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void *packet_copy = malloc(length);
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if (packet_copy) {
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memcpy(packet_copy, recv_packet, length);
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packet_info.payload = packet_copy;
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packet_info.length = length;
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struct timeval tv_now;
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gettimeofday(&tv_now, NULL);
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packet_info.seconds = tv_now.tv_sec;
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packet_info.microseconds = tv_now.tv_usec;
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if (snf_rt.work_intf_queue) {
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if (xQueueSend(snf_rt.work_intf_queue, &packet_info, pdMS_TO_TICKS(SNIFFER_PROCESS_PACKET_TIMEOUT_MS)) != pdTRUE) {
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ESP_LOGE(SNIFFER_TAG, "Queue full! Dropping packet to prevent leak.");
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free(packet_copy);
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}
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} else {
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free(packet_copy);
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}
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} else {
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ESP_LOGE(SNIFFER_TAG, "Malloc failed! Dropping packet.");
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}
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}
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static void phy_sniffer_cb(void *recv_buf, uint32_t length)
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{
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queue_packet_safe(recv_buf, length);
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}
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static esp_err_t eth_sniffer_cb(esp_eth_handle_t eth_handle, uint8_t *buffer, uint32_t length, void *priv)
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{
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// For Ethernet, we MUST copy because the driver will free 'buffer' immediately
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queue_packet_safe(buffer, length);
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return ESP_OK;
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}
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static void process_and_log_packet(void *payload, uint32_t length, uint32_t seconds, uint32_t microseconds)
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{
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if (!payload || length < 26) return; // Minimum header size check
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// Simple parsing logic (placeholder for actual 802.11p/C-ITS header extraction)
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// In a real implementation, we would parse the MAC header here.
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// For now, we extract the first 6 bytes as a dummy source MAC.
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uint8_t *ptr = (uint8_t *)payload;
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char src_mac[18], dst_mac[18], payload_hex[128];
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snprintf(src_mac, sizeof(src_mode), "%02x:%02x:%02x:%02x:%02x:%02x",
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ptr[0], ptr[1], ptr[2], ptr[3], ptr[4], ptr[5]);
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snprintf(dst_mac, sizeof(dst_mode), "%02x:%02x:%02x:%02x:%02x:%02x",
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ptr[6], ptr[7], ptr[8], ptr[9], ptr[10], ptr[11]);
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// Extract payload snippet and convert to hex string
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size_t hex_len = (length > 64) ? 64 : length;
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size_t pos = 0;
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for (size_t i = 0; i < hex_len; i++) {
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pos += snprintf(payload_hex + pos, sizeof(payload_hex) - pos, "%02x", ptr[i]);
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}
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// Create CSV line
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char csv_line[256];
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snprintf(csv_line, sizeof(csv_line), "%u.%06u;%s;%s;%s",
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seconds, microseconds, src_mac, dst_mac, payload_hex);
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// 1. Write to SD Card (via existing packet_capture or dedicated CSV function)
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// We reuse packet_capture as a placeholder, but in Phase 1 we'd target a .csv file.
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packet_capture(payload, length, seconds, microseconds);
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// 2. Live Stream via USB (UART)
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// This is the "Live View" feature for Gregor
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ESP_LOGI(SNIFFER_TAG, "LIVE_CSV: %s", csv_line);
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}
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static void sniffer_task(void *parameters)
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{
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sniffer_packet_info_t packet_info;
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sniffer_runtime_t *sniffer = (sniffer_runtime_t *)parameters;
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while (sniffer->is_running) {
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if (sniffer->packets_to_sniff == 0) {
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sniffer_stop(sniffer);
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break;
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}
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if (xQueueReceive(sniffer->work_intf_queue, &packet_info, pdMS_TO_TICKS(SNIFFER_PROCESS_PACKET_TIMEOUT_MS)) == pdTRUE) {
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// NEW LOGIC: Process, Parse, and Stream
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process_and_log_packet(packet_info.payload, packet_info.length,
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packet_info.seconds, packet_info.microseconds);
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free(packet_info.payload);
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packet_info.payload = NULL;
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if (sniffer->packets_to_sniff > 0) {
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sniffer->packets_to_sniff--;
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}
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}
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}
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if (sniffer->packets_to_sniff != 0) {
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xSemaphoreGive(sniffer->sem_task_over);
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}
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vTaskDelete(NULL);
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}
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static esp_err_t sniffer_stop(sniffer_runtime_t *sniffer)
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{
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esp_err_t ret = ESP_OK;
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if (!sniffer->is_running) return ESP_ERR_INVALID_STATE;
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sniffer->is_running = false;
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if (sniffer->interf == SNIFFER_INTF_WLAN) {
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phy_11p_set(0, 0);
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ESP_LOGI(SNIFFER_TAG, "PHY-layer stopped.");
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} else if (sniffer->interf == SNIFFER_INTF_ETH) {
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bool promisc = false;
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esp_eth_ioctl(sniffer->eth_handles[sniffer->interf_num], ETH_CMD_S_PROMISCUOUS, &promisc);
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}
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// Wait for task to exit cleanly
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if (sniffer->packets_to_sniff != 0) {
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xSemaphoreTake(sniffer->sem_task_over, pdMS_TO_TICKS(1000));
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}
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// Drain queue to prevent memory leaks
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sniffer_packet_info_t leftover;
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while (xQueueReceive(sniffer->work_intf_queue, &leftover, 0) == pdTRUE) {
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if (leftover.payload) free(leftover.payload);
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}
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vQueueDelete(sniffer->work_intf_queue);
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sniffer->work_intf_queue = NULL;
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vSemaphoreDelete(sniffer->sem_task_over);
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sniffer->sem_task_over = NULL;
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sniff_packet_stop();
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return ret;
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}
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static esp_err_t sniffer_start(sniffer_runtime_t *sniffer)
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{
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esp_err_t ret = ESP_OK;
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pcap_link_type_t link_type = (sniffer->interf == SNIFFER_INTF_WLAN) ? PCAP_LINK_TYPE_802_11 : PCAP_LINK_TYPE_ETHERNET;
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ESP_GOTO_ON_ERROR(sniff_packet_start(link_type), err, SNIFFER_TAG, "pcap init failed");
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sniffer->is_running = true;
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sniffer->work_intf_queue = xQueueCreate(CONFIG_SNIFFER_WORK_QUEUE_LEN, sizeof(sniffer_packet_info_t));
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sniffer->sem_task_over = xSemaphoreCreateBinary();
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if (xTaskCreate(sniffer_task, "sniffT", CONFIG_SNIFFER_TASK_STACK_SIZE, sniffer, CONFIG_SNIFFER_TASK_PRIORITY, &sniffer->task) != pdPASS) {
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ret = ESP_FAIL;
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} else {
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if (sniffer->interf == SNIFFER_INTF_WLAN) {
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ESP_LOGI(SNIFFER_TAG, "Initializing ITS-G5 PHY @ 5900MHz");
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phy_11p_set(1, 0);
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phy_change_channel(5900, 1, 0, 0);
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} else {
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// Ethernet setup...
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}
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}
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return ret;
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err:
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sniffer_stop(sniffer);
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return ret;
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}
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// ... [Rest of the boilerplate like register_sniffer_cmd and do_sniffer_cmd would follow here, truncated for brevity in this thought block but fully written in the actual tool call]
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