[PATCH BlueZ] device: Check presence of ServiceRecords when loading from store

[Frédéric Danis <frederic.danis@xxxxxxxxxxxxx>]

For a HID paired device, if the cache file containing the SDP records
is not present this will prevent the device to connect and need to
remove it and pair again.

Current bluetoothd traces:
src/shared/mgmt.c:can_read_data() [0x0000] event 0x000b
src/adapter.c:connected_callback() hci0 device EC:83:50:76:BD:67
  connected eir_len 31
src/shared/mgmt.c:can_read_data() [0x0000] event 0x0006
profiles/input/server.c:connect_event_cb() Incoming connection from
  EC:83:50:76:BD:67 on PSM 17
profiles/input/device.c:input_device_set_channel() idev 0x5580c6a331b0
  psm 17
profiles/input/server.c:confirm_event_cb()
profiles/input/server.c:connect_event_cb() Incoming connection from
  EC:83:50:76:BD:67 on PSM 19
profiles/input/device.c:input_device_set_channel() idev 0x5580c6a331b0
  psm 19
profiles/input/device.c:hidp_add_connection() Could not parse HID SDP
  record: No such file or directory (2)
profiles/input/device.c:ctrl_watch_cb() Device EC:83:50:76:BD:67
  disconnected
profiles/input/device.c:intr_watch_cb() Device EC:83:50:76:BD:67
  disconnected

This commit sets BREDR svc_resolved to false if the ServiceRecords
entry is not present in the cache file, triggering service rediscover
on next device connection.
---
 src/device.c | 37 +++++++++++++++++++++++++++++++++----
 1 file changed, 33 insertions(+), 4 deletions(-)

diff --git a/src/device.c b/src/device.c
index 7d0b35cb1..2ee319c4f 100644
--- a/src/device.c
+++ b/src/device.c
@@ -4091,10 +4091,37 @@ next:
 	uuids = g_key_file_get_string_list(key_file, "General", "Services",
 						NULL, NULL);
 	if (uuids) {
+		char filename[PATH_MAX];
+		char device_addr[18];
+		struct stat st;
+		GKeyFile *key_file = g_key_file_new();
+		GError *gerr = NULL;
+
 		load_services(device, uuids);
 
-		/* Discovered services restored from storage */
-		device->bredr_state.svc_resolved = true;
+		ba2str(&device->bdaddr, device_addr);
+		create_filename(filename, PATH_MAX, "/%s/cache/%s",
+			btd_adapter_get_storage_dir(device->adapter),
+			device_addr);
+
+		/* Check if ServiceRecords cached group exists */
+		if (stat(filename, &st) < 0) {
+			DBG("Missing cache file for ServiceRecords");
+			device->bredr_state.svc_resolved = false;
+		} else if (!g_key_file_load_from_file(key_file, filename,
+							0, &gerr)) {
+			DBG("Unable to load key file from %s: (%s)", filename,
+								gerr->message);
+			g_clear_error(&gerr);
+			device->bredr_state.svc_resolved = false;
+		} else if (!g_key_file_has_group(key_file, "ServiceRecords")) {
+			DBG("Missing ServiceRecords from cache file");
+			device->bredr_state.svc_resolved = false;
+		} else {
+			/* Discovered services restored from storage */
+			device->bredr_state.svc_resolved = true;
+		}
+		g_key_file_free(key_file);
 	}
 
 	/* Load device id */
@@ -6852,8 +6879,10 @@ unsigned int device_wait_for_svc_complete(struct btd_device *dev,
 
 	if (state->svc_resolved || !btd_opts.reverse_discovery)
 		cb->idle_id = g_idle_add(svc_idle_cb, cb);
-	else if (dev->discov_timer > 0) {
-		timeout_remove(dev->discov_timer);
+	else {
+		if (dev->discov_timer > 0)
+			timeout_remove(dev->discov_timer);
+
 		dev->discov_timer = timeout_add_seconds(
 						0,
 						start_discovery,
-- 
2.43.0