C++ (Cpp) create_cell_init Examples

Example #1

File: onion.c Project: BwRy/Astoria

/** Parse a CREATE, CREATE_FAST, or CREATE2 cell from <b>cell_in</b> into
 * <b>cell_out</b>. Return 0 on success, -1 on failure. (We reject some
 * syntactically valid CREATE2 cells that we can't generate or react to.) */
int
create_cell_parse(create_cell_t *cell_out, const cell_t *cell_in)
{
  switch (cell_in->command) {
  case CELL_CREATE:
    if (tor_memeq(cell_in->payload, NTOR_CREATE_MAGIC, 16)) {
      create_cell_init(cell_out, CELL_CREATE, ONION_HANDSHAKE_TYPE_NTOR,
                       NTOR_ONIONSKIN_LEN, cell_in->payload+16);
    } else {
      create_cell_init(cell_out, CELL_CREATE, ONION_HANDSHAKE_TYPE_TAP,
                       TAP_ONIONSKIN_CHALLENGE_LEN, cell_in->payload);
    }
    break;
  case CELL_CREATE_FAST:
    create_cell_init(cell_out, CELL_CREATE_FAST, ONION_HANDSHAKE_TYPE_FAST,
                     CREATE_FAST_LEN, cell_in->payload);
    break;
  case CELL_CREATE2:
    if (parse_create2_payload(cell_out, cell_in->payload,
                              CELL_PAYLOAD_SIZE) < 0)
      return -1;
    break;
  default:
    return -1;
  }

  return check_create_cell(cell_out, 0);
}

Example #2

File: test.c Project: ageis/tor

/** Run unit tests for the onion queues. */
static void
test_onion_queues(void *arg)
{
  uint8_t buf1[TAP_ONIONSKIN_CHALLENGE_LEN] = {0};
  uint8_t buf2[NTOR_ONIONSKIN_LEN] = {0};

  or_circuit_t *circ1 = or_circuit_new(0, NULL);
  or_circuit_t *circ2 = or_circuit_new(0, NULL);

  create_cell_t *onionskin = NULL, *create2_ptr;
  create_cell_t *create1 = tor_malloc_zero(sizeof(create_cell_t));
  create_cell_t *create2 = tor_malloc_zero(sizeof(create_cell_t));
  (void)arg;
  create2_ptr = create2; /* remember, but do not free */

  create_cell_init(create1, CELL_CREATE, ONION_HANDSHAKE_TYPE_TAP,
                   TAP_ONIONSKIN_CHALLENGE_LEN, buf1);
  create_cell_init(create2, CELL_CREATE, ONION_HANDSHAKE_TYPE_NTOR,
                   NTOR_ONIONSKIN_LEN, buf2);

  tt_int_op(0,OP_EQ, onion_num_pending(ONION_HANDSHAKE_TYPE_TAP));
  tt_int_op(0,OP_EQ, onion_pending_add(circ1, create1));
  create1 = NULL;
  tt_int_op(1,OP_EQ, onion_num_pending(ONION_HANDSHAKE_TYPE_TAP));

  tt_int_op(0,OP_EQ, onion_num_pending(ONION_HANDSHAKE_TYPE_NTOR));
  tt_int_op(0,OP_EQ, onion_pending_add(circ2, create2));
  create2 = NULL;
  tt_int_op(1,OP_EQ, onion_num_pending(ONION_HANDSHAKE_TYPE_NTOR));

  tt_ptr_op(circ2,OP_EQ, onion_next_task(&onionskin));
  tt_int_op(1,OP_EQ, onion_num_pending(ONION_HANDSHAKE_TYPE_TAP));
  tt_int_op(0,OP_EQ, onion_num_pending(ONION_HANDSHAKE_TYPE_NTOR));
  tt_ptr_op(onionskin, OP_EQ, create2_ptr);

  clear_pending_onions();
  tt_int_op(0,OP_EQ, onion_num_pending(ONION_HANDSHAKE_TYPE_TAP));
  tt_int_op(0,OP_EQ, onion_num_pending(ONION_HANDSHAKE_TYPE_NTOR));

 done:
  circuit_free_(TO_CIRCUIT(circ1));
  circuit_free_(TO_CIRCUIT(circ2));
  tor_free(create1);
  tor_free(create2);
  tor_free(onionskin);
}

Example #3

File: onion.c Project: BwRy/Astoria

/** Helper: parse the CREATE2 payload at <b>p</b>, which could be up to
 * <b>p_len</b> bytes long, and use it to fill the fields of
 * <b>cell_out</b>. Return 0 on success and -1 on failure.
 *
 * Note that part of the body of an EXTEND2 cell is a CREATE2 payload, so
 * this function is also used for parsing those.
 */
static int
parse_create2_payload(create_cell_t *cell_out, const uint8_t *p, size_t p_len)
{
  uint16_t handshake_type, handshake_len;

  if (p_len < 4)
    return -1;

  handshake_type = ntohs(get_uint16(p));
  handshake_len = ntohs(get_uint16(p+2));

  if (handshake_len > CELL_PAYLOAD_SIZE - 4 || handshake_len > p_len - 4)
    return -1;
  if (handshake_type == ONION_HANDSHAKE_TYPE_FAST)
    return -1;

  create_cell_init(cell_out, CELL_CREATE2, handshake_type, handshake_len,
                   p+4);
  return 0;
}