src/gatt-client: always check properties in WriteValue

This modifies the GATT client characteristic WriteValue D-Bus method to always check that the characteristic supports the requested type of write by checking for the corresponding property before attempting to write.

Before this change, if the "type" option was used and it was set to "reliable" or "request", then BlueZ would attempt the write even if the characteristic does not support that write type. On the other hand, if "type" was set to "command" or was not specified, the method would return a org.bluez.Error.NotSupported error without attempting to write.

After this change, the WriteValue method will consistently return org.bluez.Error.NotSupported if the corresponding property flag is not set for all types of writes.

---
 src/gatt-client.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

index a9bfc2802..0bfcfa692 100644
@@ -1016,8 +1016,8 @@ static DBusMessage *characteristic_write_value(DBusConnection *conn,
 	 *     - If value is larger than MTU - 3: long-write
 	 *   * "write-without-response" property set -> write command.
 	 */
-	if ((!type && (chrc->ext_props & BT_GATT_CHRC_EXT_PROP_RELIABLE_WRITE))
-			|| (type && !strcasecmp(type, "reliable"))) {
+	if ((!type || (type && !strcasecmp(type, "reliable"))) &&
+			chrc->ext_props & BT_GATT_CHRC_EXT_PROP_RELIABLE_WRITE) {
 		supported = true;
 		chrc->write_op = start_long_write(msg, chrc->value_handle, gatt,
 						true, value, value_len, offset,

@@ -1026,8 +1026,8 @@ static DBusMessage *characteristic_write_value(DBusConnection *conn,
 			return NULL;
 	}
 
-	if ((!type && chrc->props & BT_GATT_CHRC_PROP_WRITE) ||
-			(type && !strcasecmp(type, "request"))) {
+	if ((!type || (type && !strcasecmp(type, "request"))) &&
+			chrc->props & BT_GATT_CHRC_PROP_WRITE) {
 		uint16_t mtu;
 
 		supported = true;

2.17.1

This is automated email and please do not replay to this email!

Dear submitter,

Thank you for submitting the patches to the linux bluetooth mailing list. While we are preparing for reviewing the patches, we found the following issue/warning.

Test Result:
Checkpatch Failed

Patch Title:
[BlueZ] src/gatt-client: always check properties in WriteValue

Output:
WARNING:LONG_LINE: line over 80 characters
#32: FILE: src/gatt-client.c:1020:
+ chrc->ext_props & BT_GATT_CHRC_EXT_PROP_RELIABLE_WRITE) {

- total: 0 errors, 1 warnings, 20 lines checked

NOTE: For some of the reported defects, checkpatch may be able to
mechanically convert to the typical style using --fix or --fix-inplace.

Your patch has style problems, please review.

NOTE: Ignored message types: COMMIT_MESSAGE COMPLEX_MACRO CONST_STRUCT FILE_PATH_CHANGES MISSING_SIGN_OFF PREFER_PACKED SPLIT_STRING

NOTE: If any of the errors are false positives, please report
them to the maintainer, see CHECKPATCH in MAINTAINERS.

For more details about BlueZ coding style guide, please find it in doc/coding-style.txt

---
Regards,
Linux Bluetooth