Move common code from Discover all Characteristics to GATT library
The attribute client (attrib/client.c) and gatttool share similar code
to parse the PDU coming from server. This commit moves this common code
to attrib/gatt.c, and simplifies the callbacks implemented by the
clients. The client callbacks are now called just once and get a GSList
of characteristics, instead of the raw PDU.
diff --git a/attrib/att.h b/attrib/att.h
index 08feeec..a1e0b62 100644
--- a/attrib/att.h
+++ b/attrib/att.h
@@ -143,6 +143,13 @@
uint16_t end;
};
+struct att_char {
+ char uuid[MAX_LEN_UUID_STR + 1];
+ uint16_t handle;
+ uint8_t properties;
+ uint16_t value_handle;
+};
+
/* These functions do byte conversion */
static inline uint8_t att_get_u8(const void *ptr)
{
diff --git a/attrib/client.c b/attrib/client.c
index 7f72348..767d1c1 100644
--- a/attrib/client.c
+++ b/attrib/client.c
@@ -85,7 +85,7 @@
uint16_t handle;
uint16_t end;
uint8_t perm;
- uuid_t type;
+ char type[MAX_LEN_UUID_STR + 1];
char *name;
char *desc;
struct format *format;
@@ -199,7 +199,7 @@
DBUS_TYPE_STRING_AS_STRING DBUS_TYPE_VARIANT_AS_STRING
DBUS_DICT_ENTRY_END_CHAR_AS_STRING, &dict);
- uuid = bt_uuid2string(&chr->type);
+ uuid = g_strdup(chr->type);
dict_append_entry(&dict, "UUID", DBUS_TYPE_STRING, &uuid);
g_free(uuid);
@@ -544,19 +544,12 @@
for (l = chars; l; l = l->next) {
struct characteristic *chr = l->data;
- uuid_t *uuid128;
char chr_str[64];
- char uuidstr[MAX_LEN_UUID_STR];
memset(chr_str, 0, sizeof(chr_str));
- uuid128 = sdp_uuid_to_uuid128(&chr->type);
- sdp_uuid2strn(uuid128, uuidstr, MAX_LEN_UUID_STR);
-
- bt_free(uuid128);
-
snprintf(chr_str, sizeof(chr_str), "%04X#%02X#%04X#%s ",
- chr->handle, chr->perm, chr->end, uuidstr);
+ chr->handle, chr->perm, chr->end, chr->type);
characteristics = g_string_append(characteristics, chr_str);
}
@@ -607,13 +600,12 @@
for (i = 0; chars[i]; i++) {
struct characteristic *chr;
- char uuidstr[MAX_LEN_UUID_STR + 1];
int ret;
chr = g_new0(struct characteristic, 1);
ret = sscanf(chars[i], "%04hX#%02hhX#%04hX#%s", &chr->handle,
- &chr->perm, &chr->end, uuidstr);
+ &chr->perm, &chr->end, chr->type);
if (ret < 4) {
g_free(chr);
continue;
@@ -623,8 +615,6 @@
chr->path = g_strdup_printf("%s/characteristic%04x",
prim->path, chr->handle);
- bt_string2uuid(&chr->type, uuidstr);
-
l = g_slist_append(l, chr);
}
@@ -861,54 +851,37 @@
gatt_read_char(gatt->attrib, chr->handle, update_char_value, qvalue);
}
-static void char_discovered_cb(guint8 status, const guint8 *pdu, guint16 plen,
+static void char_discovered_cb(GSList *characteristics, guint8 status,
gpointer user_data)
{
struct query_data *current = user_data;
struct primary *prim = current->prim;
struct att_primary *att = prim->att;
struct gatt_service *gatt = prim->gatt;
- struct att_data_list *list;
- uint16_t last, *previous_end = NULL;
- int i;
-
- if (status == ATT_ECODE_ATTR_NOT_FOUND)
- goto done;
+ uint16_t *previous_end = NULL;
+ GSList *l;
if (status != 0) {
DBG("Discover all characteristics failed: %s",
att_ecode2str(status));
-
goto fail;
}
- DBG("Read by Type Response received");
-
- list = dec_read_by_type_resp(pdu, plen);
- if (list == NULL)
- goto fail;
-
- for (i = 0, last = 0; i < list->num; i++) {
- uint8_t *decl = list->data[i];
+ for (l = characteristics; l; l = l->next) {
+ struct att_char *current_chr = l->data;
struct characteristic *chr;
chr = g_new0(struct characteristic, 1);
chr->prim = prim;
- chr->perm = decl[2];
- chr->handle = att_get_u16(&decl[3]);
+ chr->perm = current_chr->properties;
+ chr->handle = current_chr->value_handle;
chr->path = g_strdup_printf("%s/characteristic%04x",
prim->path, chr->handle);
- if (list->len == 7) {
- sdp_uuid16_create(&chr->type,
- att_get_u16(&decl[5]));
- } else
- sdp_uuid128_create(&chr->type, &decl[5]);
+ strncpy(chr->type, current_chr->uuid, sizeof(chr->type));
- if (previous_end) {
- *previous_end = att_get_u16(decl);
- }
+ if (previous_end)
+ *previous_end = current_chr->handle;
- last = chr->handle;
previous_end = &chr->end;
prim->chars = g_slist_append(prim->chars, chr);
@@ -917,18 +890,6 @@
if (previous_end)
*previous_end = att->end;
- att_data_list_free(list);
-
- if (last >= att->end)
- goto done;
-
- /* Fetch remaining characteristics for the CURRENT primary service */
- gatt_discover_char(gatt->attrib, last + 1, att->end,
- char_discovered_cb, current);
-
- return;
-
-done:
store_characteristics(gatt, prim);
register_characteristics(prim);
diff --git a/attrib/gatt.c b/attrib/gatt.c
index 79d8b9d..5d7887e 100644
--- a/attrib/gatt.c
+++ b/attrib/gatt.c
@@ -39,6 +39,15 @@
void *user_data;
};
+struct discover_char {
+ GAttrib *attrib;
+ uuid_t uuid;
+ uint16_t end;
+ GSList *characteristics;
+ gatt_cb_t cb;
+ void *user_data;
+};
+
static void discover_primary_free(struct discover_primary *dp)
{
g_slist_free(dp->primaries);
@@ -46,6 +55,14 @@
g_free(dp);
}
+static void discover_char_free(struct discover_char *dc)
+{
+ g_slist_foreach(dc->characteristics, (GFunc) g_free, NULL);
+ g_slist_free(dc->characteristics);
+ g_attrib_unref(dc->attrib);
+ g_free(dc);
+}
+
static guint16 encode_discover_primary(uint16_t start, uint16_t end,
uuid_t *uuid, uint8_t *pdu, size_t len)
{
@@ -222,15 +239,103 @@
return g_attrib_send(attrib, 0, pdu[0], pdu, plen, cb, dp, NULL);
}
-guint gatt_discover_char(GAttrib *attrib, uint16_t start, uint16_t end,
- GAttribResultFunc func, gpointer user_data)
+static void char_discovered_cb(guint8 status, const guint8 *ipdu, guint16 iplen,
+ gpointer user_data)
{
+ struct discover_char *dc = user_data;
+ struct att_data_list *list;
+ unsigned int i, err;
+ uint8_t opdu[ATT_DEFAULT_MTU];
+ guint16 oplen;
+ uuid_t uuid;
+ uint16_t last = 0;
+
+ if (status) {
+ err = status == ATT_ECODE_ATTR_NOT_FOUND ? 0 : status;
+ goto done;
+ }
+
+ list = dec_read_by_type_resp(ipdu, iplen);
+ if (list == NULL) {
+ err = ATT_ECODE_IO;
+ goto done;
+ }
+
+ for (i = 0; i < list->num; i++) {
+ uint8_t *value = list->data[i];
+ struct att_char *chars;
+ uuid_t u128, u16;
+
+ last = att_get_u16(value);
+
+ if (list->len == 7) {
+ sdp_uuid16_create(&u16, att_get_u16(&value[5]));
+ sdp_uuid16_to_uuid128(&u128, &u16);
+ } else
+ sdp_uuid128_create(&u128, &value[5]);
+
+ chars = g_try_new0(struct att_char, 1);
+ if (!chars) {
+ err = ATT_ECODE_INSUFF_RESOURCES;
+ goto done;
+ }
+
+ chars->handle = last;
+ chars->properties = value[2];
+ chars->value_handle = att_get_u16(&value[3]);
+ sdp_uuid2strn(&u128, chars->uuid, sizeof(chars->uuid));
+ dc->characteristics = g_slist_append(dc->characteristics,
+ chars);
+ }
+
+ att_data_list_free(list);
+ err = 0;
+
+ if (last != 0) {
+ sdp_uuid16_create(&uuid, GATT_CHARAC_UUID);
+
+ oplen = enc_read_by_type_req(last + 1, dc->end, &uuid, opdu,
+ sizeof(opdu));
+
+ if (oplen == 0)
+ return;
+
+ g_attrib_send(dc->attrib, 0, opdu[0], opdu, oplen,
+ char_discovered_cb, dc, NULL);
+
+ return;
+ }
+
+done:
+ dc->cb(dc->characteristics, err, dc->user_data);
+ discover_char_free(dc);
+}
+
+guint gatt_discover_char(GAttrib *attrib, uint16_t start, uint16_t end,
+ gatt_cb_t func, gpointer user_data)
+{
+ uint8_t pdu[ATT_DEFAULT_MTU];
+ struct discover_char *dc;
+ guint16 plen;
uuid_t uuid;
sdp_uuid16_create(&uuid, GATT_CHARAC_UUID);
- return gatt_read_char_by_uuid(attrib, start, end, &uuid, func,
- user_data);
+ plen = enc_read_by_type_req(start, end, &uuid, pdu, sizeof(pdu));
+ if (plen == 0)
+ return 0;
+
+ dc = g_try_new0(struct discover_char, 1);
+ if (dc == NULL)
+ return 0;
+
+ dc->attrib = g_attrib_ref(attrib);
+ dc->cb = func;
+ dc->user_data = user_data;
+ dc->end = end;
+
+ return g_attrib_send(attrib, 0, pdu[0], pdu, plen, char_discovered_cb,
+ dc, NULL);
}
guint gatt_read_char_by_uuid(GAttrib *attrib, uint16_t start, uint16_t end,
diff --git a/attrib/gatt.h b/attrib/gatt.h
index 0bdac77..9f69646 100644
--- a/attrib/gatt.h
+++ b/attrib/gatt.h
@@ -30,7 +30,7 @@
gpointer user_data);
guint gatt_discover_char(GAttrib *attrib, uint16_t start, uint16_t end,
- GAttribResultFunc func, gpointer user_data);
+ gatt_cb_t func, gpointer user_data);
guint gatt_read_char(GAttrib *attrib, uint16_t handle, GAttribResultFunc func,
gpointer user_data);
diff --git a/attrib/gatttool.c b/attrib/gatttool.c
index ad0216b..8e8ed8e 100644
--- a/attrib/gatttool.c
+++ b/attrib/gatttool.c
@@ -245,73 +245,34 @@
return FALSE;
}
-static void char_discovered_cb(guint8 status, const guint8 *pdu, guint16 plen,
+static void char_discovered_cb(GSList *characteristics, guint8 status,
gpointer user_data)
{
- struct characteristic_data *char_data = user_data;
- struct att_data_list *list;
- uint16_t last = char_data->start;
- int i;
+ GSList *l;
- if (status == ATT_ECODE_ATTR_NOT_FOUND)
- goto done;
-
- if (status != 0) {
+ if (status) {
g_printerr("Discover all characteristics failed: %s\n",
att_ecode2str(status));
goto done;
}
- list = dec_read_by_type_resp(pdu, plen);
- if (list == NULL)
- return;
+ for (l = characteristics; l; l = l->next) {
+ struct att_char *chars = l->data;
- for (i = 0; i < list->num; i++) {
- uint8_t *value = list->data[i];
- char uuidstr[MAX_LEN_UUID_STR];
- uuid_t uuid;
-
- last = att_get_u16(value);
-
- g_print("handle = 0x%04x, char properties = 0x%02x, "
- "char value handle = 0x%04x, ", last, value[2],
- att_get_u16(&value[3]));
-
- if (list->len == 7)
- sdp_uuid16_create(&uuid, att_get_u16(&value[5]));
- else
- sdp_uuid128_create(&uuid, value + 5);
-
- sdp_uuid2strn(&uuid, uuidstr, MAX_LEN_UUID_STR);
- g_print("uuid = %s\n", uuidstr);
+ g_print("handle = 0x%04x, char properties = 0x%02x, char value "
+ "handle = 0x%04x, uuid = %s\n", chars->handle,
+ chars->properties, chars->value_handle, chars->uuid);
}
- att_data_list_free(list);
-
- /* Fetch remaining characteristics for the CURRENT primary service */
- gatt_discover_char(char_data->attrib, last + 1, char_data->end,
- char_discovered_cb, char_data);
-
- return;
-
done:
- g_free(char_data);
- if (opt_listen == FALSE)
- g_main_loop_quit(event_loop);
+ g_main_loop_quit(event_loop);
}
static gboolean characteristics(gpointer user_data)
{
GAttrib *attrib = user_data;
- struct characteristic_data *char_data;
- char_data = g_new(struct characteristic_data, 1);
- char_data->attrib = attrib;
- char_data->start = opt_start;
- char_data->end = opt_end;
-
- gatt_discover_char(attrib, opt_start, opt_end, char_discovered_cb,
- char_data);
+ gatt_discover_char(attrib, opt_start, opt_end, char_discovered_cb, NULL);
return FALSE;
}
