This patch implements bt_gatt_discover_primary_services for the case when no
UUID is provided.
---
src/shared/gatt-helpers.c | 253 +++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 251 insertions(+), 2 deletions(-)
diff --git a/src/shared/gatt-helpers.c b/src/shared/gatt-helpers.c
index 96137bf..d427eaf 100644
--- a/src/shared/gatt-helpers.c
+++ b/src/shared/gatt-helpers.c
@@ -36,6 +36,70 @@
#define MIN(a, b) ((a) < (b) ? (a) : (b))
#endif
+struct bt_gatt_list {
+ struct bt_gatt_list *next;
+ void *data;
+};
+
+struct list_ptrs {
+ struct bt_gatt_list *head;
+ struct bt_gatt_list *tail;
+};
+
+struct bt_gatt_list *bt_gatt_list_get_next(struct bt_gatt_list *list)
+{
+ return list->next;
+}
+
+void *bt_gatt_list_get_data(struct bt_gatt_list *list)
+{
+ return list->data;
+}
+
+static inline bool list_isempty(struct list_ptrs *list)
+{
+ return !list->head && !list->tail;
+}
+
+static bool list_add(struct list_ptrs *list, void *data)
+{
+ struct bt_gatt_list *item = new0(struct bt_gatt_list, 1);
+ if (!item)
+ return false;
+
+ item->data = data;
+
+ if (list_isempty(list)) {
+ list->head = list->tail = item;
+ return true;
+ }
+
+ list->tail->next = item;
+ list->tail = item;
+
+ return true;
+}
+
+static void list_free(struct list_ptrs *list, bt_gatt_destroy_func_t destroy)
+{
+ struct bt_gatt_list *l, *tmp;
+ l = list->head;
+
+ while (l) {
+ if (destroy)
+ destroy(l->data);
+
+ tmp = l->next;
+ free(l);
+ l = tmp;
+ }
+}
+
+static const uint8_t bt_base_uuid[16] = {
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x00,
+ 0x80, 0x00, 0x00, 0x80, 0x5F, 0x9B, 0x34, 0xFB
+};
+
struct mtu_op {
struct bt_att *att;
uint16_t client_rx_mtu;
@@ -122,14 +186,199 @@ bool bt_gatt_exchange_mtu(struct bt_att *att, uint16_t client_rx_mtu,
return true;
}
+struct discovery_op {
+ struct bt_att *att;
+ int ref_count;
+ bt_uuid_t uuid;
+ struct list_ptrs results;
+ bt_gatt_discovery_callback_t callback;
+ void *user_data;
+ bt_gatt_destroy_func_t destroy;
+};
+
+static struct discovery_op* discovery_op_ref(struct discovery_op *op)
+{
+ __sync_fetch_and_add(&op->ref_count, 1);
+
+ return op;
+}
+
+static void discovery_op_unref(void *data)
+{
+ struct discovery_op *op = data;
+
+ if (__sync_sub_and_fetch(&op->ref_count, 1))
+ return;
+
+ if (op->destroy)
+ op->destroy(op->user_data);
+
+ list_free(&op->results, free);
+
+ free(op);
+}
+
+static void put_uuid_le(const bt_uuid_t *src, void *dst)
+{
+ if (src->type == BT_UUID16)
+ put_le16(src->value.u16, dst);
+ else
+ bswap_128(&src->value.u128, dst);
+}
+
+static bool convert_uuid_le(const uint8_t *src, size_t len, uint8_t dst[16])
+{
+ if (len == 16) {
+ bswap_128(src, dst);
+ return true;
+ }
+
+ if (len != 2)
+ return false;
+
+ memcpy(dst, bt_base_uuid, sizeof(bt_base_uuid));
+ dst[2] = src[1];
+ dst[3] = src[0];
+
+ return true;
+}
+
+static void read_by_grp_type_cb(uint8_t opcode, const void *pdu,
+ uint16_t length, void *user_data)
+{
+ struct discovery_op *op = user_data;
+ bool success;
+ uint8_t att_ecode = 0;
+ struct bt_gatt_list *results = NULL;
+ size_t data_length;
+ size_t list_length;
+ uint16_t last_end;
+ int i;
+
+ if (opcode == BT_ATT_OP_ERROR_RSP) {
+ success = false;
+ att_ecode = process_error(pdu, length);
+
+ if (att_ecode == BT_ATT_ERROR_ATTRIBUTE_NOT_FOUND &&
+ !list_isempty(&op->results))
+ goto success;
+
+ goto done;
+ }
+
+ /* PDU must contain at least the following (sans opcode):
+ * - Attr Data Length (1 octet)
+ * - Attr Data List (at least 6 octets):
+ * -- 2 octets: Attribute handle
+ * -- 2 octets: End group handle
+ * -- 2 or 16 octets: service UUID
+ */
+ if (opcode != BT_ATT_OP_READ_BY_GRP_TYPE_RSP || !pdu || length < 7) {
+ success = false;
+ goto done;
+ }
+
+ data_length = ((uint8_t *) pdu)[0];
+ list_length = length - 1;
+
+ if ((list_length % data_length) ||
+ (data_length != 6 && data_length != 20)) {
+ success = false;
+ goto done;
+ }
+
+ for (i = 1; i < length; i += data_length) {
+ struct bt_gatt_service *service;
+
+ service = new0(struct bt_gatt_service, 1);
+ if (!service) {
+ success = false;
+ goto done;
+ }
+
+ service->start = get_le16(pdu + i);
+ last_end = get_le16(pdu + i + 2);
+ service->end = last_end;
+ convert_uuid_le(pdu + i + 4, data_length - 4, service->uuid);
+
+ if (!list_add(&op->results, service)) {
+ success = false;
+ goto done;
+ }
+ }
+
+ if (last_end != 0xffff) {
+ uint8_t pdu[6];
+
+ put_le16(last_end + 1, pdu);
+ put_le16(0xffff, pdu + 2);
+ put_le16(GATT_PRIM_SVC_UUID, pdu + 4);
+
+ if (bt_att_send(op->att, BT_ATT_OP_READ_BY_GRP_TYPE_REQ,
+ pdu, sizeof(pdu),
+ read_by_grp_type_cb,
+ discovery_op_ref(op),
+ discovery_op_unref))
+ return;
+
+ discovery_op_unref(op);
+ success = false;
+ goto done;
+ }
+
+success:
+ /* End of procedure */
+ results = op->results.head;
+ success = true;
+
+done:
+ if (op->callback)
+ op->callback(success, att_ecode, results, op->user_data);
+}
+
bool bt_gatt_discover_primary_services(struct bt_att *att,
bt_uuid_t *uuid,
bt_gatt_discovery_callback_t callback,
void *user_data,
bt_gatt_destroy_func_t destroy)
{
- /* TODO */
- return false;
+ struct discovery_op *op;
+ bool result;
+
+ if (!att)
+ return false;
+
+ op = new0(struct discovery_op, 1);
+ if (!op)
+ return false;
+
+ op->att = att;
+ op->callback = callback;
+ op->user_data = user_data;
+ op->destroy = destroy;
+
+ /* If UUID is NULL, then discover all primary services */
+ if (!uuid) {
+ uint8_t pdu[6];
+
+ put_le16(0x0001, pdu);
+ put_le16(0xffff, pdu + 2);
+ put_le16(GATT_PRIM_SVC_UUID, pdu + 4);
+
+ result = bt_att_send(att, BT_ATT_OP_READ_BY_GRP_TYPE_REQ,
+ pdu, sizeof(pdu),
+ read_by_grp_type_cb,
+ discovery_op_ref(op),
+ discovery_op_unref);
+ } else {
+ free(op);
+ return false;
+ }
+
+ if (!result)
+ free(op);
+
+ return result;
}
bool bt_gatt_discover_included_services(struct bt_att *att,
--
2.0.0.526.g5318336
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