xref: /aosp_15_r20/system/nfc/src/fuzzers/nci/nci.cc (revision 7eba2f3b06c51ae21384f6a4f14577b668a869b3)

#include "fuzz.h"
#include "gki_int.h"

#define MODULE_NAME "nfc_nci_fuzzer"
const char fuzzer_name[] = MODULE_NAME;

enum {
  SUB_TYPE_DUMMY,

  SUB_TYPE_MAX
};

static void resp_cback(tNFC_RESPONSE_EVT event, tNFC_RESPONSE* p_data) {
  FUZZLOG(MODULE_NAME ": event=0x%02x, p_data=%p", event, p_data);
}

static void nfc_vs_cback(tNFC_VS_EVT event, uint16_t len, uint8_t* data) {
  FUZZLOG(MODULE_NAME ": event=0x%02x, data=%p", event,
          BytesToHex(data, len).c_str());
}

static void nfc_rf_cback(uint8_t conn_id, tNFC_CONN_EVT event,
                         tNFC_CONN* p_data) {
  FUZZLOG(MODULE_NAME ": rf_cback, conn_id=%d, event=0x%02x", conn_id, event);

  if (event == NFC_DATA_CEVT) {
    if (p_data->data.p_data) {
      GKI_freebuf(p_data->data.p_data);
      p_data->data.p_data = nullptr;
    }
  }
}

static void nfc_hci_cback(uint8_t conn_id, tNFC_CONN_EVT event,
                          tNFC_CONN* p_data) {
  FUZZLOG(MODULE_NAME ": hci_cback, conn_id=%d, event=0x%02x", conn_id, event);

  if (event == NFC_DATA_CEVT) {
    if (p_data->data.p_data) {
      GKI_freebuf(p_data->data.p_data);
      p_data->data.p_data = nullptr;
    }
  }
}

extern void hal_inject_event(uint8_t hal_evt, tHAL_NFC_STATUS status);
extern bool hal_inject_data(const uint8_t* p_data, uint16_t data_len);
extern tHAL_NFC_ENTRY* get_hal_func_entries();

extern uint8_t nci_snd_core_reset(uint8_t reset_type);
extern void GKI_shutdown();

extern tGKI_CB gki_cb;
static bool Fuzz_Init(Fuzz_Context& /*ctx*/) {
  GKI_init();
  gki_cb.os.thread_id[NFC_TASK] = pthread_self();

  NFC_Init(get_hal_func_entries());
  NFC_Enable(resp_cback);

  NFC_RegVSCback(true, nfc_vs_cback);
  NFC_SetStaticRfCback(nfc_rf_cback);
  NFC_SetStaticHciCback(nfc_hci_cback);

  nfc_set_state(NFC_STATE_CORE_INIT);
  nci_snd_core_reset(NCI_RESET_TYPE_RESET_CFG);
  return true;
}

static void Fuzz_Deinit(Fuzz_Context& /*ctx*/) {
  nfc_task_shutdown_nfcc();
  GKI_shutdown();
}

static void Fuzz_Run(Fuzz_Context& ctx) {
  for (auto it = ctx.Data.cbegin(); it != ctx.Data.cend(); ++it) {
    hal_inject_data(it->data(), it->size());
  }
}

void Fuzz_FixPackets(std::vector<bytes_t>& Packets, uint /*Seed*/) {
  for (auto it = Packets.begin(); it != Packets.end(); ++it) {
    // NCI packets should have at least 2 bytes.
    if (it->size() < 2) {
      it->resize(2);
    }
  }
}

void Fuzz_RunPackets(const std::vector<bytes_t>& Packets) {
  Fuzz_Context ctx(SUB_TYPE_DUMMY, Packets);
  if (Fuzz_Init(ctx)) {
    Fuzz_Run(ctx);
  }

  Fuzz_Deinit(ctx);
}