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 | 194 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ attrib/gatt.h | 9 +++ 2 files changed, 203 insertions(+) diff --git a/attrib/gatt.c b/attrib/gatt.c index 6880e2d..902ac23 100644 --- a/attrib/gatt.c +++ b/attrib/gatt.c @@ -45,6 +45,21 @@ struct discover_primary { void *user_data; }; +struct find_included { + GAttrib *attrib; + int refs; + int err; + uint16_t end_handle; + GSList *includes; + gatt_cb_t cb; + void *user_data; +}; + +struct included_uuid_resolve { + struct find_included *fi; + struct gatt_included *included; +}; + struct discover_char { GAttrib *attrib; bt_uuid_t *uuid; @@ -61,6 +76,26 @@ static void discover_primary_free(struct discover_primary *dp) g_free(dp); } +static struct find_included *find_included_ref(struct find_included *fi) +{ + g_atomic_int_inc(&fi->refs); + + return fi; +} + +static void find_included_unref(struct find_included *fi) +{ + if (g_atomic_int_dec_and_test(&fi->refs) == FALSE) + return; + + fi->cb(fi->includes, fi->err, fi->user_data); + + g_slist_free_full(fi->includes, g_free); + g_attrib_unref(fi->attrib); + g_free(fi); +} + + static void discover_char_free(struct discover_char *dc) { g_slist_free_full(dc->characteristics, g_free); @@ -248,6 +283,165 @@ 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_resolve *resolve = user_data; + struct find_included *fi = resolve->fi; + struct gatt_included *incl = resolve->included; + bt_uuid_t uuid; + unsigned int err = status; + size_t buflen; + uint8_t *buf; + + if (err) + goto done; + + buf = g_attrib_get_buffer(fi->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)); + fi->includes = g_slist_append(fi->includes, incl); + +done: + if (err) + g_free(incl); + + if (fi->err == 0) + fi->err = err; + + find_included_unref(fi); + + g_free(resolve); +} + +static guint resolve_included_uuid(struct find_included *fi, + struct gatt_included *incl) +{ + size_t buflen; + uint8_t *buf = g_attrib_get_buffer(fi->attrib, &buflen); + guint16 oplen = enc_read_req(incl->range.start, buf, buflen); + struct included_uuid_resolve *resolve; + + resolve = g_new0(struct included_uuid_resolve, 1); + resolve->fi = find_included_ref(fi); + resolve->included = incl; + + return g_attrib_send(fi->attrib, 0, buf[0], buf, oplen, + resolve_included_uuid_cb, resolve, NULL); +} + +static struct gatt_included *included_from_buf(const uint8_t *buf, gsize buflen) +{ + 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 (buflen == 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 find_included *fi, uint16_t start) +{ + bt_uuid_t uuid; + size_t buflen; + uint8_t *buf = g_attrib_get_buffer(fi->attrib, &buflen); + guint16 oplen; + + bt_uuid16_create(&uuid, GATT_INCLUDE_UUID); + oplen = enc_read_by_type_req(start, fi->end_handle, &uuid, + buf, buflen); + + find_included_ref(fi); + + return g_attrib_send(fi->attrib, 0, buf[0], buf, oplen, + find_included_cb, fi, NULL); +} + +static void find_included_cb(uint8_t status, const uint8_t *pdu, uint16_t len, + gpointer user_data) +{ + struct find_included *fi = user_data; + uint16_t last_handle = fi->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(fi, incl); + continue; + } + + fi->includes = g_slist_append(fi->includes, incl); + } + + att_data_list_free(list); + + if (last_handle < fi->end_handle) + find_included(fi, last_handle + 1); + +done: + if (fi->err == 0) + fi->err = err; + + find_included_unref(fi); +} + +unsigned int gatt_find_included(GAttrib *attrib, uint16_t start, uint16_t end, + gatt_cb_t func, gpointer user_data) +{ + struct find_included *fi; + + fi = g_new0(struct find_included, 1); + fi->attrib = g_attrib_ref(attrib); + fi->end_handle = end; + fi->cb = func; + fi->user_data = user_data; + + return find_included(fi, 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 6bb6f0f..2897482 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 -- To unsubscribe from this list: send the line "unsubscribe linux-bluetooth" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html