Some services like HID over LE can reference another service using
included services.
See Vol 3, Part G, section 2.6.3 of Core specification for more
details.
---
attrib/gatt.c | 192 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
attrib/gatt.h | 9 +++
2 files changed, 201 insertions(+)
diff --git a/attrib/gatt.c b/attrib/gatt.c
index 882f3c1..d55e7fe 100644
--- a/attrib/gatt.c
+++ b/attrib/gatt.c
@@ -45,6 +45,22 @@ struct discover_primary {
void *user_data;
};
+/* Used for the Included Services Discovery (ISD) procedure */
+struct included_discovery {
+ GAttrib *attrib;
+ int refs;
+ int err;
+ uint16_t end_handle;
+ GSList *includes;
+ gatt_cb_t cb;
+ void *user_data;
+};
+
+struct included_uuid_query {
+ struct included_discovery *isd;
+ struct gatt_included *included;
+};
+
struct discover_char {
GAttrib *attrib;
bt_uuid_t *uuid;
@@ -61,6 +77,25 @@ static void discover_primary_free(struct discover_primary *dp)
g_free(dp);
}
+static struct included_discovery *isd_ref(struct included_discovery *isd)
+{
+ g_atomic_int_inc(&isd->refs);
+
+ return isd;
+}
+
+static void isd_unref(struct included_discovery *isd)
+{
+ if (g_atomic_int_dec_and_test(&isd->refs) == FALSE)
+ return;
+
+ isd->cb(isd->includes, isd->err, isd->user_data);
+
+ g_slist_free_full(isd->includes, g_free);
+ g_attrib_unref(isd->attrib);
+ g_free(isd);
+}
+
static void discover_char_free(struct discover_char *dc)
{
g_slist_free_full(dc->characteristics, g_free);
@@ -248,6 +283,163 @@ guint gatt_discover_primary(GAttrib *attrib, bt_uuid_t *uuid, gatt_cb_t func,
return g_attrib_send(attrib, 0, buf[0], buf, plen, cb, dp, NULL);
}
+static void resolve_included_uuid_cb(uint8_t status, const uint8_t *pdu,
+ uint16_t len, gpointer user_data)
+{
+ struct included_uuid_query *query = user_data;
+ struct included_discovery *isd = query->isd;
+ struct gatt_included *incl = query->included;
+ unsigned int err = status;
+ bt_uuid_t uuid;
+ size_t buflen;
+ uint8_t *buf;
+
+ if (err)
+ goto done;
+
+ buf = g_attrib_get_buffer(isd->attrib, &buflen);
+ if (dec_read_resp(pdu, len, buf, buflen) != 16) {
+ err = ATT_ECODE_IO;
+ goto done;
+ }
+
+ uuid = att_get_uuid128(buf);
+ bt_uuid_to_string(&uuid, incl->uuid, sizeof(incl->uuid));
+ isd->includes = g_slist_append(isd->includes, incl);
+
+done:
+ if (err)
+ g_free(incl);
+
+ if (isd->err == 0)
+ isd->err = err;
+
+ isd_unref(isd);
+
+ g_free(query);
+}
+
+static guint resolve_included_uuid(struct included_discovery *isd,
+ struct gatt_included *incl)
+{
+ struct included_uuid_query *query;
+ size_t buflen;
+ uint8_t *buf = g_attrib_get_buffer(isd->attrib, &buflen);
+ guint16 oplen = enc_read_req(incl->range.start, buf, buflen);
+
+ query = g_new0(struct included_uuid_query, 1);
+ query->isd = isd_ref(isd);
+ query->included = incl;
+
+ return g_attrib_send(isd->attrib, 0, buf[0], buf, oplen,
+ resolve_included_uuid_cb, query, NULL);
+}
+
+static struct gatt_included *included_from_buf(const uint8_t *buf, gsize len)
+{
+ struct gatt_included *incl = g_new0(struct gatt_included, 1);
+
+ incl->handle = att_get_u16(&buf[0]);
+ incl->range.start = att_get_u16(&buf[2]);
+ incl->range.end = att_get_u16(&buf[4]);
+
+ if (len == 8) {
+ bt_uuid_t uuid128;
+ bt_uuid_t uuid16 = att_get_uuid16(&buf[6]);
+
+ bt_uuid_to_uuid128(&uuid16, &uuid128);
+ bt_uuid_to_string(&uuid128, incl->uuid, sizeof(incl->uuid));
+ }
+
+ return incl;
+}
+
+static void find_included_cb(uint8_t status, const uint8_t *pdu, uint16_t len,
+ gpointer user_data);
+
+static guint find_included(struct included_discovery *isd, uint16_t start)
+{
+ bt_uuid_t uuid;
+ size_t buflen;
+ uint8_t *buf = g_attrib_get_buffer(isd->attrib, &buflen);
+ guint16 oplen;
+
+ bt_uuid16_create(&uuid, GATT_INCLUDE_UUID);
+ oplen = enc_read_by_type_req(start, isd->end_handle, &uuid,
+ buf, buflen);
+
+ return g_attrib_send(isd->attrib, 0, buf[0], buf, oplen,
+ find_included_cb, isd_ref(isd), NULL);
+}
+
+static void find_included_cb(uint8_t status, const uint8_t *pdu, uint16_t len,
+ gpointer user_data)
+{
+ struct included_discovery *isd = user_data;
+ uint16_t last_handle = isd->end_handle;
+ unsigned int err = status;
+ struct att_data_list *list;
+ int i;
+
+ if (err == ATT_ECODE_ATTR_NOT_FOUND)
+ err = 0;
+
+ if (status)
+ goto done;
+
+ list = dec_read_by_type_resp(pdu, len);
+ if (list == NULL) {
+ err = ATT_ECODE_IO;
+ goto done;
+ }
+
+ if (list->len != 6 && list->len != 8) {
+ err = ATT_ECODE_IO;
+ att_data_list_free(list);
+ goto done;
+ }
+
+ for (i = 0; i < list->num; i++) {
+ struct gatt_included *incl;
+
+ incl = included_from_buf(list->data[i], list->len);
+ last_handle = incl->handle;
+
+ /* 128 bit UUID, needs resolving */
+ if (list->len == 6) {
+ resolve_included_uuid(isd, incl);
+ continue;
+ }
+
+ isd->includes = g_slist_append(isd->includes, incl);
+ }
+
+ att_data_list_free(list);
+
+ if (last_handle < isd->end_handle)
+ find_included(isd, last_handle + 1);
+
+done:
+ if (isd->err == 0)
+ isd->err = err;
+
+ isd_unref(isd);
+}
+
+unsigned int gatt_find_included(GAttrib *attrib, uint16_t start, uint16_t end,
+ gatt_cb_t func, gpointer user_data)
+{
+ struct included_discovery *isd;
+
+ isd = g_new0(struct included_discovery, 1);
+ isd->attrib = g_attrib_ref(attrib);
+ isd->end_handle = end;
+ isd->cb = func;
+ isd->user_data = user_data;
+
+ return find_included(isd, start);
+}
+
static void char_discovered_cb(guint8 status, const guint8 *ipdu, guint16 iplen,
gpointer user_data)
{
diff --git a/attrib/gatt.h b/attrib/gatt.h
index 3862011..305b4c6 100644
--- a/attrib/gatt.h
+++ b/attrib/gatt.h
@@ -61,6 +61,12 @@ struct gatt_primary {
struct att_range range;
};
+struct gatt_included {
+ char uuid[MAX_LEN_UUID_STR + 1];
+ uint16_t handle;
+ struct att_range range;
+};
+
struct gatt_char {
char uuid[MAX_LEN_UUID_STR + 1];
uint16_t handle;
@@ -71,6 +77,9 @@ struct gatt_char {
guint gatt_discover_primary(GAttrib *attrib, bt_uuid_t *uuid, gatt_cb_t func,
gpointer user_data);
+unsigned int gatt_find_included(GAttrib *attrib, uint16_t start, uint16_t end,
+ gatt_cb_t func, gpointer user_data);
+
guint gatt_discover_char(GAttrib *attrib, uint16_t start, uint16_t end,
bt_uuid_t *uuid, gatt_cb_t func,
gpointer user_data);
--
1.7.12.2
--
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