plugins/admin: persist policy settings

This adds code to store the ServiceAllowlist to file
/var/lib/bluetooth/{MAC_ADDR}/admin_policy
The stored settings will be loaded upon admin_policy initialized.

Reviewed-by: Miao-chen Chou <mcchou@chromium.org>
Signed-off-by: Ayush Garg <ayush.garg@samsung.com>

diff --git a/plugins/admin.c b/plugins/admin.c
index e0279f8..428a552 100644 (file)
--- a/plugins/admin.c
+++ b/plugins/admin.c
@@ -14,6 +14,9 @@
 
 #include <dbus/dbus.h>
 #include <gdbus/gdbus.h>
+#include <sys/file.h>
+#include <sys/stat.h>
+#include <errno.h>
 
 #include "lib/bluetooth.h"
 #include "lib/uuid.h"
@@ -24,11 +27,13 @@
 #include "src/error.h"
 #include "src/log.h"
 #include "src/plugin.h"
+#include "src/textfile.h"
 
 #include "src/shared/queue.h"
 
 #define ADMIN_POLICY_SET_INTERFACE     "org.bluez.AdminPolicySet1"
 #define ADMIN_POLICY_STATUS_INTERFACE  "org.bluez.AdminPolicyStatus1"
+#define ADMIN_POLICY_STORAGE           STORAGEDIR "/admin_policy_settings"
 
 #define DBUS_BLUEZ_SERVICE             "org.bluez"
 #define BTD_DEVICE_INTERFACE           "org.bluez.Device1"
@@ -161,6 +166,161 @@ static void update_device_affected(void *data, void *user_data)
                        ADMIN_POLICY_STATUS_INTERFACE, "AffectedByPolicy");
 }
 
+static void free_uuid_strings(char **uuid_strs, gsize num)
+{
+       gsize i;
+
+       for (i = 0; i < num; i++)
+               g_free(uuid_strs[i]);
+       g_free(uuid_strs);
+}
+
+static char **new_uuid_strings(struct queue *allowlist, gsize *num)
+{
+       const struct queue_entry *entry = NULL;
+       bt_uuid_t *uuid = NULL;
+       char **uuid_strs = NULL;
+       gsize i = 0, allowlist_num;
+
+       /* Set num to a non-zero number so that whoever call this could know if
+        * this function success or not
+        */
+       *num = 1;
+
+       allowlist_num = queue_length(allowlist);
+       uuid_strs = g_try_malloc_n(allowlist_num, sizeof(char *));
+       if (!uuid_strs)
+               return NULL;
+
+       for (entry = queue_get_entries(allowlist); entry != NULL;
+                                                       entry = entry->next) {
+               uuid = entry->data;
+               uuid_strs[i] = g_try_malloc0(MAX_LEN_UUID_STR * sizeof(char));
+
+               if (!uuid_strs[i])
+                       goto failed;
+
+               bt_uuid_to_string(uuid, uuid_strs[i], MAX_LEN_UUID_STR);
+               i++;
+       }
+
+       *num = allowlist_num;
+       return uuid_strs;
+
+failed:
+       free_uuid_strings(uuid_strs, i);
+
+       return NULL;
+}
+
+static void store_policy_settings(struct btd_admin_policy *admin_policy)
+{
+       GKeyFile *key_file = NULL;
+       char *filename = ADMIN_POLICY_STORAGE;
+       char *key_file_data = NULL;
+       char **uuid_strs = NULL;
+       gsize length, num_uuids;
+
+       key_file = g_key_file_new();
+
+       uuid_strs = new_uuid_strings(admin_policy->service_allowlist,
+                                                               &num_uuids);
+
+       if (!uuid_strs && num_uuids) {
+               btd_error(admin_policy->adapter_id,
+                                       "Failed to allocate uuid strings");
+               goto failed;
+       }
+
+       g_key_file_set_string_list(key_file, "General", "ServiceAllowlist",
+                                       (const gchar * const *)uuid_strs,
+                                       num_uuids);
+
+       if (create_file(ADMIN_POLICY_STORAGE, 0600) < 0) {
+               btd_error(admin_policy->adapter_id, "create %s failed, %s",
+                                               filename, strerror(errno));
+               goto failed;
+       }
+
+       key_file_data = g_key_file_to_data(key_file, &length, NULL);
+       g_file_set_contents(ADMIN_POLICY_STORAGE, key_file_data, length, NULL);
+
+       g_free(key_file_data);
+       free_uuid_strings(uuid_strs, num_uuids);
+
+failed:
+       g_key_file_free(key_file);
+}
+
+static void key_file_load_service_allowlist(GKeyFile *key_file,
+                                       struct btd_admin_policy *admin_policy)
+{
+       GError *gerr = NULL;
+       struct queue *uuid_list = NULL;
+       gchar **uuids = NULL;
+       gsize num, i;
+
+       uuids = g_key_file_get_string_list(key_file, "General",
+                                       "ServiceAllowlist", &num, &gerr);
+
+       if (gerr) {
+               btd_error(admin_policy->adapter_id,
+                                       "Failed to load ServiceAllowlist");
+               g_error_free(gerr);
+               return;
+       }
+
+       uuid_list = queue_new();
+       for (i = 0; i < num; i++) {
+               bt_uuid_t *uuid = g_try_malloc(sizeof(*uuid));
+
+               if (!uuid)
+                       goto failed;
+
+               if (bt_string_to_uuid(uuid, *uuids)) {
+
+                       btd_error(admin_policy->adapter_id,
+                                       "Failed to convert '%s' to uuid struct",
+                                       *uuids);
+
+                       g_free(uuid);
+                       goto failed;
+               }
+
+               queue_push_tail(uuid_list, uuid);
+               uuids++;
+       }
+
+       if (!service_allowlist_set(admin_policy, uuid_list))
+               goto failed;
+
+       return;
+failed:
+       free_service_allowlist(uuid_list);
+}
+
+static void load_policy_settings(struct btd_admin_policy *admin_policy)
+{
+       GKeyFile *key_file;
+       char *filename = ADMIN_POLICY_STORAGE;
+       struct stat st;
+
+       if (stat(filename, &st) < 0) {
+               btd_error(admin_policy->adapter_id,
+                               "Failed to get file %s information",
+                               filename);
+               return;
+       }
+
+       key_file = g_key_file_new();
+
+       g_key_file_load_from_file(key_file, filename, 0, NULL);
+
+       key_file_load_service_allowlist(key_file, admin_policy);
+
+       g_key_file_free(key_file);
+}
+
 static DBusMessage *set_service_allowlist(DBusConnection *conn,
                                        DBusMessage *msg, void *user_data)
 {
@@ -179,7 +339,9 @@ static DBusMessage *set_service_allowlist(DBusConnection *conn,
                return btd_error_invalid_args(msg);
        }
 
-       if (!service_allowlist_set(admin_policy, uuid_list)) {
+       if (service_allowlist_set(admin_policy, uuid_list)) {
+               store_policy_settings(admin_policy);
+       } else {
                free_service_allowlist(uuid_list);
                return btd_error_failed(msg, "service_allowlist_set failed");
        }
@@ -305,6 +467,7 @@ static int admin_policy_adapter_probe(struct btd_adapter *adapter)
        if (!policy_data)
                return -ENOMEM;
 
+       load_policy_settings(policy_data);
        adapter_path = adapter_get_path(adapter);
 
        if (!g_dbus_register_interface(dbus_conn, adapter_path,