device: Store Database Hash on storage

This stores the hash on the storage so it can be reloaded when the
daemon/system restarts.

Change-Id: Ie8d397ab41ceb60b143998a0a516b392088d5e62
Signed-off-by: himanshu <h.himanshu@samsung.com>

diff --git a/src/device.c b/src/device.c
index c01821f..a518d9e 100644 (file)
--- a/src/device.c
+++ b/src/device.c
@@ -2797,6 +2797,18 @@ struct gatt_saver {
        GKeyFile *key_file;
 };
 
+static void db_hash_read_value_cb(struct gatt_db_attribute *attrib,
+                                               int err, const uint8_t *value,
+                                               size_t length, void *user_data)
+{
+       const uint8_t **hash = user_data;
+
+       if (err || (length != 16))
+               return;
+
+       *hash = value;
+}
+
 static void store_desc(struct gatt_db_attribute *attr, void *user_data)
 {
        struct gatt_saver *saver = user_data;
@@ -2828,7 +2840,7 @@ static void store_chrc(struct gatt_db_attribute *attr, void *user_data)
        char handle[6], value[100], uuid_str[MAX_LEN_UUID_STR];
        uint16_t handle_num, value_handle;
        uint8_t properties;
-       bt_uuid_t uuid;
+       bt_uuid_t uuid, hash_uuid;
 
        if (!gatt_db_attribute_get_char_data(attr, &handle_num, &value_handle,
                                                &properties, &saver->ext_props,
@@ -2839,8 +2851,34 @@ static void store_chrc(struct gatt_db_attribute *attr, void *user_data)
 
        sprintf(handle, "%04hx", handle_num);
        bt_uuid_to_string(&uuid, uuid_str, sizeof(uuid_str));
-       sprintf(value, GATT_CHARAC_UUID_STR ":%04hx:%02hhx:%s", value_handle,
-                                                       properties, uuid_str);
+
+       /* Store Database Hash  value if available */
+       bt_uuid16_create(&hash_uuid, GATT_CHARAC_DB_HASH);
+       if (!bt_uuid_cmp(&uuid, &hash_uuid)) {
+               const uint8_t *hash = NULL;
+
+               attr = gatt_db_get_attribute(saver->device->db, value_handle);
+
+               gatt_db_attribute_read(attr, 0, BT_ATT_OP_READ_REQ, NULL,
+                                       db_hash_read_value_cb, &hash);
+               if (hash)
+                       sprintf(value, GATT_CHARAC_UUID_STR ":%04hx:%02hhx:"
+                               "%02hhx%02hhx%02hhx%02hhx%02hhx%02hhx%02hhx"
+                               "%02hhx%02hhx%02hhx%02hhx%02hhx%02hhx%02hhx"
+                               "%02hhx%02hhx:%s", value_handle, properties,
+                               hash[0], hash[1], hash[2], hash[3],
+                               hash[4], hash[5], hash[6], hash[7],
+                               hash[8], hash[9], hash[10], hash[11],
+                               hash[12], hash[13], hash[14], hash[15],
+                               uuid_str);
+               else
+                       sprintf(value, GATT_CHARAC_UUID_STR ":%04hx:%02hhx:%s",
+                               value_handle, properties, uuid_str);
+
+       } else
+               sprintf(value, GATT_CHARAC_UUID_STR ":%04hx:%02hhx:%s",
+                               value_handle, properties, uuid_str);
+
        g_key_file_set_string(key_file, "Attributes", handle, value);
 
        gatt_db_service_foreach_desc(attr, store_desc, saver);
@@ -5083,6 +5121,20 @@ static void load_desc_value(struct gatt_db_attribute *attrib,
                warn("loading descriptor value to db failed");
 }
 
+static ssize_t str2val(const char *str, uint8_t *val, size_t len)
+{
+       const char *pos = str;
+       size_t i;
+
+       for (i = 0; i < len; i++) {
+               if (sscanf(pos, "%2hhx", &val[i]) != 1)
+                       break;
+               pos += 2;
+       }
+
+       return i;
+}
+
 static int load_desc(char *handle, char *value,
                                        struct gatt_db_attribute *service)
 {
@@ -5102,7 +5154,7 @@ static int load_desc(char *handle, char *value,
                val = 0;
        }
 
-       DBG("loading descriptor handle: 0x%04x, value: 0x%04x, uuid: %s",
+       DBG("loading descriptor handle: 0x%04x, value: 0x%04x, value uuid: %s",
                                handle_int, val, uuid_str);
 
        bt_string_to_uuid(&uuid, uuid_str);
@@ -5137,21 +5189,31 @@ static int load_chrc(char *handle, char *value,
        uint16_t properties, value_handle, handle_int;
        char uuid_str[MAX_LEN_UUID_STR];
        struct gatt_db_attribute *att;
+       char val_str[32];
+       uint8_t val[16];
+       size_t val_len;
        bt_uuid_t uuid;
 
        if (sscanf(handle, "%04hx", &handle_int) != 1)
                return -EIO;
 
-       if (sscanf(value, GATT_CHARAC_UUID_STR ":%04hx:%02hx:%s", &value_handle,
-                                               &properties, uuid_str) != 3)
-               return -EIO;
+       /* Check if there is any value stored */
+       if (sscanf(value, GATT_CHARAC_UUID_STR ":%04hx:%02hx:%32s:%s",
+                       &value_handle, &properties, val_str, uuid_str) != 4) {
+               if (sscanf(value, GATT_CHARAC_UUID_STR ":%04hx:%02hx:%s",
+                               &value_handle, &properties, uuid_str) != 3)
+                       return -EIO;
+               val_len = 0;
+       } else
+               val_len = str2val(val_str, val, sizeof(val));
 
        bt_string_to_uuid(&uuid, uuid_str);
 
        /* Log debug message. */
        DBG("loading characteristic handle: 0x%04x, value handle: 0x%04x,"
-                               " properties 0x%04x uuid: %s", handle_int,
-                               value_handle, properties, uuid_str);
+                               " properties 0x%04x value: %s uuid: %s",
+                               handle_int, value_handle, properties,
+                               val_len ? val_str : "", uuid_str);
 
        att = gatt_db_service_insert_characteristic(service, value_handle,
                                                        &uuid, 0, properties,
@@ -5161,6 +5223,12 @@ static int load_chrc(char *handle, char *value,
                return -EIO;
        }
 
+       if (val_len) {
+               if (!gatt_db_attribute_write(att, 0, val, val_len, 0, NULL,
+                                               load_desc_value, NULL))
+                       return -EIO;
+       }
+
        return 0;
 }