static bool disconnect_cb(struct io *io, void *user_data)
{
struct bt_att *att = user_data;
int err;
socklen_t len;
len = sizeof(err);
if (getsockopt(att->fd, SOL_SOCKET, SO_ERROR, &err, &len) < 0) {
util_debug(att->debug_callback, att->debug_data,
"Failed to obtain disconnect error: %s",
strerror(errno));
err = 0;
}
util_debug(att->debug_callback, att->debug_data,
"Physical link disconnected: %s",
strerror(err));
io_destroy(att->io);
att->io = NULL;
bt_att_cancel_all(att);
bt_att_ref(att);
queue_foreach(att->disconn_list, disconn_handler, INT_TO_PTR(err));
bt_att_unregister_all(att);
bt_att_unref(att);
return false;
}
struct bt_gatt_server *bt_gatt_server_new(struct gatt_db *db,
struct bt_att *att, uint16_t mtu)
{
struct bt_gatt_server *server;
if (!att || !db)
return NULL;
server = new0(struct bt_gatt_server, 1);
if (!server)
return NULL;
server->db = gatt_db_ref(db);
server->att = bt_att_ref(att);
server->mtu = MAX(mtu, BT_ATT_DEFAULT_LE_MTU);
server->max_prep_queue_len = DEFAULT_MAX_PREP_QUEUE_LEN;
server->prep_queue = queue_new();
if (!server->prep_queue) {
bt_gatt_server_free(server);
return NULL;
}
if (!gatt_server_register_att_handlers(server)) {
bt_gatt_server_free(server);
return NULL;
}
return bt_gatt_server_ref(server);
}
static void handle_notify(struct bt_att *att, uint8_t opcode, uint8_t *pdu,
ssize_t pdu_len)
{
struct notify_data data;
bt_att_ref(att);
att->in_notify = true;
memset(&data, 0, sizeof(data));
data.opcode = opcode;
if (pdu_len > 0) {
data.pdu = pdu;
data.pdu_len = pdu_len;
}
queue_foreach(att->notify_list, notify_handler, &data);
att->in_notify = false;
if (att->need_notify_cleanup) {
queue_remove_all(att->notify_list, match_notify_removed, NULL,
destroy_att_notify);
att->need_notify_cleanup = false;
}
bt_att_unref(att);
}
struct bt_att *bt_att_new(int fd)
{
struct bt_att *att;
if (fd < 0)
return NULL;
att = new0(struct bt_att, 1);
if (!att)
return NULL;
att->fd = fd;
att->mtu = ATT_DEFAULT_LE_MTU;
att->buf = malloc(att->mtu);
if (!att->buf)
goto fail;
att->io = io_new(fd);
if (!att->io)
goto fail;
att->req_queue = queue_new();
if (!att->req_queue)
goto fail;
att->ind_queue = queue_new();
if (!att->ind_queue)
goto fail;
att->write_queue = queue_new();
if (!att->write_queue)
goto fail;
att->notify_list = queue_new();
if (!att->notify_list)
goto fail;
if (!io_set_read_handler(att->io, can_read_data, att, NULL))
goto fail;
return bt_att_ref(att);
fail:
queue_destroy(att->req_queue, NULL);
queue_destroy(att->ind_queue, NULL);
queue_destroy(att->write_queue, NULL);
io_destroy(att->io);
free(att->buf);
free(att);
return NULL;
}
static void handle_notify(struct bt_att *att, uint8_t opcode, uint8_t *pdu,
ssize_t pdu_len)
{
const struct queue_entry *entry;
bool found;
if ((opcode & ATT_OP_SIGNED_MASK) && !att->crypto) {
if (!handle_signed(att, opcode, pdu, pdu_len))
return;
pdu_len -= BT_ATT_SIGNATURE_LEN;
}
bt_att_ref(att);
found = false;
entry = queue_get_entries(att->notify_list);
while (entry) {
struct att_notify *notify = entry->data;
entry = entry->next;
if (!opcode_match(notify->opcode, opcode))
continue;
found = true;
if (notify->callback)
notify->callback(opcode, pdu, pdu_len,
notify->user_data);
/* callback could remove all entries from notify list */
if (queue_isempty(att->notify_list))
break;
}
/*
* If this was a request and no handler was registered for it, respond
* with "Not Supported"
*/
if (!found && get_op_type(opcode) == ATT_OP_TYPE_REQ)
respond_not_supported(att, opcode);
bt_att_unref(att);
}
struct bt_att *bt_att_new(int fd, bool ext_signed)
{
struct bt_att *att;
if (fd < 0)
return NULL;
att = new0(struct bt_att, 1);
if (!att)
return NULL;
att->fd = fd;
att->mtu = BT_ATT_DEFAULT_LE_MTU;
att->buf = malloc(att->mtu);
if (!att->buf)
goto fail;
att->io = io_new(fd);
if (!att->io)
goto fail;
/* crypto is optional, if not available leave it NULL */
if (!ext_signed)
att->crypto = bt_crypto_new();
att->req_queue = queue_new();
if (!att->req_queue)
goto fail;
att->ind_queue = queue_new();
if (!att->ind_queue)
goto fail;
att->write_queue = queue_new();
if (!att->write_queue)
goto fail;
att->notify_list = queue_new();
if (!att->notify_list)
goto fail;
att->disconn_list = queue_new();
if (!att->disconn_list)
goto fail;
if (!io_set_read_handler(att->io, can_read_data, att, NULL))
goto fail;
if (!io_set_disconnect_handler(att->io, disconnect_cb, att, NULL))
goto fail;
att->io_on_l2cap = is_io_l2cap_based(att->fd);
if (!att->io_on_l2cap)
att->io_sec_level = BT_SECURITY_LOW;
return bt_att_ref(att);
fail:
bt_att_free(att);
return NULL;
}
static bool can_read_data(struct io *io, void *user_data)
{
struct bt_att *att = user_data;
uint8_t opcode;
uint8_t *pdu;
ssize_t bytes_read;
bytes_read = read(att->fd, att->buf, att->mtu);
if (bytes_read < 0)
return false;
util_hexdump('>', att->buf, bytes_read,
att->debug_callback, att->debug_data);
if (bytes_read < ATT_MIN_PDU_LEN)
return true;
pdu = att->buf;
opcode = pdu[0];
bt_att_ref(att);
/* Act on the received PDU based on the opcode type */
switch (get_op_type(opcode)) {
case ATT_OP_TYPE_RSP:
util_debug(att->debug_callback, att->debug_data,
"ATT response received: 0x%02x", opcode);
handle_rsp(att, opcode, pdu + 1, bytes_read - 1);
break;
case ATT_OP_TYPE_CONF:
util_debug(att->debug_callback, att->debug_data,
"ATT confirmation received: 0x%02x", opcode);
handle_conf(att, pdu + 1, bytes_read - 1);
break;
case ATT_OP_TYPE_REQ:
/*
* If a request is currently pending, then the sequential
* protocol was violated. Disconnect the bearer, which will
* promptly notify the upper layer via disconnect handlers.
*/
if (att->in_req) {
util_debug(att->debug_callback, att->debug_data,
"Received request while another is "
"pending: 0x%02x", opcode);
io_shutdown(att->io);
bt_att_unref(att);
return false;
}
att->in_req = true;
/* Fall through to the next case */
case ATT_OP_TYPE_CMD:
case ATT_OP_TYPE_NOT:
case ATT_OP_TYPE_UNKNOWN:
case ATT_OP_TYPE_IND:
default:
/* For all other opcodes notify the upper layer of the PDU and
* let them act on it.
*/
util_debug(att->debug_callback, att->debug_data,
"ATT PDU received: 0x%02x", opcode);
handle_notify(att, opcode, pdu + 1, bytes_read - 1);
break;
}
bt_att_unref(att);
return true;
}
