100 lines
3.2 KiB
C
100 lines
3.2 KiB
C
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#include "nfc_debug_pcap.h"
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#include <furi_hal_rtc.h>
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#define TAG "NfcDebugPcap"
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#define PCAP_MAGIC 0xa1b2c3d4
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#define PCAP_MAJOR 2
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#define PCAP_MINOR 4
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#define DLT_ISO_14443 264
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#define DATA_PICC_TO_PCD 0xFF
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#define DATA_PCD_TO_PICC 0xFE
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#define DATA_PICC_TO_PCD_CRC_DROPPED 0xFB
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#define DATA_PCD_TO_PICC_CRC_DROPPED 0xFA
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File* nfc_debug_pcap_open(Storage* storage) {
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File* file = storage_file_alloc(storage);
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if(!storage_file_open(file, "/ext/nfc/debug.pcap", FSAM_WRITE, FSOM_OPEN_APPEND)) {
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storage_file_free(file);
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return NULL;
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}
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if(!storage_file_tell(file)) {
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struct {
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uint32_t magic;
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uint16_t major, minor;
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uint32_t reserved[2];
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uint32_t snaplen;
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uint32_t link_type;
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} __attribute__((__packed__)) pcap_hdr = {
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.magic = PCAP_MAGIC,
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.major = PCAP_MAJOR,
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.minor = PCAP_MINOR,
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.snaplen = FURI_HAL_NFC_DATA_BUFF_SIZE,
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.link_type = DLT_ISO_14443,
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};
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if(storage_file_write(file, &pcap_hdr, sizeof(pcap_hdr)) != sizeof(pcap_hdr)) {
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FURI_LOG_E(TAG, "Failed to write pcap header");
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}
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}
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return file;
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}
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void nfc_debug_pcap_write(Storage* storage, uint8_t event, uint8_t* data, uint16_t len) {
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File* file = nfc_debug_pcap_open(storage);
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if(!file) return;
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FuriHalRtcDateTime datetime;
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furi_hal_rtc_get_datetime(&datetime);
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struct {
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// https://wiki.wireshark.org/Development/LibpcapFileFormat#record-packet-header
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uint32_t ts_sec;
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uint32_t ts_usec;
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uint32_t incl_len;
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uint32_t orig_len;
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// https://www.kaiser.cx/posts/pcap-iso14443/#_packet_data
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uint8_t version;
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uint8_t event;
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uint16_t len;
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} __attribute__((__packed__)) pkt_hdr = {
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.ts_sec = furi_hal_rtc_datetime_to_timestamp(&datetime),
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.ts_usec = 0,
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.incl_len = len + 4,
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.orig_len = len + 4,
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.version = 0,
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.event = event,
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.len = len << 8 | len >> 8,
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};
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if(storage_file_write(file, &pkt_hdr, sizeof(pkt_hdr)) != sizeof(pkt_hdr)) {
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FURI_LOG_E(TAG, "Failed to write pcap packet header");
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} else if(storage_file_write(file, data, len) != len) {
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FURI_LOG_E(TAG, "Failed to write pcap packet data");
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}
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storage_file_free(file);
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}
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void nfc_debug_pcap_write_tx(uint8_t* data, uint16_t bits, bool crc_dropped, void* context) {
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uint8_t event = crc_dropped ? DATA_PCD_TO_PICC_CRC_DROPPED : DATA_PCD_TO_PICC;
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nfc_debug_pcap_write(context, event, data, bits / 8);
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}
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void nfc_debug_pcap_write_rx(uint8_t* data, uint16_t bits, bool crc_dropped, void* context) {
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uint8_t event = crc_dropped ? DATA_PICC_TO_PCD_CRC_DROPPED : DATA_PICC_TO_PCD;
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nfc_debug_pcap_write(context, event, data, bits / 8);
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}
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void nfc_debug_pcap_prepare_tx_rx(FuriHalNfcTxRxContext* tx_rx, Storage* storage, bool is_picc) {
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if(furi_hal_rtc_is_flag_set(FuriHalRtcFlagDebug)) {
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if(is_picc) {
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tx_rx->sniff_tx = nfc_debug_pcap_write_rx;
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tx_rx->sniff_rx = nfc_debug_pcap_write_tx;
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} else {
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tx_rx->sniff_tx = nfc_debug_pcap_write_tx;
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tx_rx->sniff_rx = nfc_debug_pcap_write_rx;
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}
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tx_rx->sniff_context = storage;
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}
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}
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