summaryrefslogtreecommitdiff
path: root/bus/services.c
diff options
context:
space:
mode:
Diffstat (limited to 'bus/services.c')
-rw-r--r--bus/services.c1306
1 files changed, 1306 insertions, 0 deletions
diff --git a/bus/services.c b/bus/services.c
new file mode 100644
index 00000000..b260c633
--- /dev/null
+++ b/bus/services.c
@@ -0,0 +1,1306 @@
+/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
+/* services.c Service management
+ *
+ * Copyright (C) 2003 Red Hat, Inc.
+ * Copyright (C) 2003 CodeFactory AB
+ *
+ * Licensed under the Academic Free License version 2.1
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ */
+#include <dbus/dbus-hash.h>
+#include <dbus/dbus-list.h>
+#include <dbus/dbus-mempool.h>
+#include <dbus/dbus-marshal-validate.h>
+
+#include "driver.h"
+#include "services.h"
+#include "connection.h"
+#include "utils.h"
+#include "activation.h"
+#include "policy.h"
+#include "bus.h"
+#include "selinux.h"
+
+struct BusService
+{
+ int refcount;
+
+ BusRegistry *registry;
+ char *name;
+ DBusList *owners;
+};
+
+struct BusOwner
+{
+ int refcount;
+
+ BusService *service;
+ DBusConnection *conn;
+
+ unsigned int allow_replacement : 1;
+ unsigned int do_not_queue : 1;
+};
+
+struct BusRegistry
+{
+ int refcount;
+
+ BusContext *context;
+
+ DBusHashTable *service_hash;
+ DBusMemPool *service_pool;
+ DBusMemPool *owner_pool;
+
+ DBusHashTable *service_sid_table;
+};
+
+BusRegistry*
+bus_registry_new (BusContext *context)
+{
+ BusRegistry *registry;
+
+ registry = dbus_new0 (BusRegistry, 1);
+ if (registry == NULL)
+ return NULL;
+
+ registry->refcount = 1;
+ registry->context = context;
+
+ registry->service_hash = _dbus_hash_table_new (DBUS_HASH_STRING,
+ NULL, NULL);
+ if (registry->service_hash == NULL)
+ goto failed;
+
+ registry->service_pool = _dbus_mem_pool_new (sizeof (BusService),
+ TRUE);
+
+ if (registry->service_pool == NULL)
+ goto failed;
+
+ registry->owner_pool = _dbus_mem_pool_new (sizeof (BusOwner),
+ TRUE);
+
+ if (registry->owner_pool == NULL)
+ goto failed;
+
+ registry->service_sid_table = NULL;
+
+ return registry;
+
+ failed:
+ bus_registry_unref (registry);
+ return NULL;
+}
+
+BusRegistry *
+bus_registry_ref (BusRegistry *registry)
+{
+ _dbus_assert (registry->refcount > 0);
+ registry->refcount += 1;
+
+ return registry;
+}
+
+void
+bus_registry_unref (BusRegistry *registry)
+{
+ _dbus_assert (registry->refcount > 0);
+ registry->refcount -= 1;
+
+ if (registry->refcount == 0)
+ {
+ if (registry->service_hash)
+ _dbus_hash_table_unref (registry->service_hash);
+ if (registry->service_pool)
+ _dbus_mem_pool_free (registry->service_pool);
+ if (registry->owner_pool)
+ _dbus_mem_pool_free (registry->owner_pool);
+ if (registry->service_sid_table)
+ _dbus_hash_table_unref (registry->service_sid_table);
+
+ dbus_free (registry);
+ }
+}
+
+BusService*
+bus_registry_lookup (BusRegistry *registry,
+ const DBusString *service_name)
+{
+ BusService *service;
+
+ service = _dbus_hash_table_lookup_string (registry->service_hash,
+ _dbus_string_get_const_data (service_name));
+
+ return service;
+}
+
+static DBusList *
+_bus_service_find_owner_link (BusService *service,
+ DBusConnection *connection)
+{
+ DBusList *link;
+
+ link = _dbus_list_get_first_link (&service->owners);
+
+ while (link != NULL)
+ {
+ BusOwner *bus_owner;
+
+ bus_owner = (BusOwner *) link->data;
+ if (bus_owner->conn == connection)
+ break;
+
+ link = _dbus_list_get_next_link (&service->owners, link);
+ }
+
+ return link;
+}
+
+static void
+bus_owner_set_flags (BusOwner *owner,
+ dbus_uint32_t flags)
+{
+ owner->allow_replacement =
+ (flags & DBUS_NAME_FLAG_ALLOW_REPLACEMENT) != FALSE;
+
+ owner->do_not_queue =
+ (flags & DBUS_NAME_FLAG_DO_NOT_QUEUE) != FALSE;
+}
+
+static BusOwner *
+bus_owner_new (BusService *service,
+ DBusConnection *conn,
+ dbus_uint32_t flags)
+{
+ BusOwner *result;
+
+ result = _dbus_mem_pool_alloc (service->registry->owner_pool);
+ if (result != NULL)
+ {
+ result->refcount = 1;
+ /* don't ref the connection because we don't want
+ to block the connection from going away.
+ transactions take care of reffing the connection
+ but we need to use refcounting on the owner
+ so that the owner does not get freed before
+ we can deref the connection in the transaction
+ */
+ result->conn = conn;
+ result->service = service;
+
+ if (!bus_connection_add_owned_service (conn, service))
+ {
+ _dbus_mem_pool_dealloc (service->registry->owner_pool, result);
+ return NULL;
+ }
+
+ bus_owner_set_flags (result, flags);
+ }
+ return result;
+}
+
+static BusOwner *
+bus_owner_ref (BusOwner *owner)
+{
+ _dbus_assert (owner->refcount > 0);
+ owner->refcount += 1;
+
+ return owner;
+}
+
+static void
+bus_owner_unref (BusOwner *owner)
+{
+ _dbus_assert (owner->refcount > 0);
+ owner->refcount -= 1;
+
+ if (owner->refcount == 0)
+ {
+ bus_connection_remove_owned_service (owner->conn, owner->service);
+ _dbus_mem_pool_dealloc (owner->service->registry->owner_pool, owner);
+ }
+}
+
+BusService*
+bus_registry_ensure (BusRegistry *registry,
+ const DBusString *service_name,
+ DBusConnection *owner_connection_if_created,
+ dbus_uint32_t flags,
+ BusTransaction *transaction,
+ DBusError *error)
+{
+ BusService *service;
+
+ _DBUS_ASSERT_ERROR_IS_CLEAR (error);
+
+ _dbus_assert (owner_connection_if_created != NULL);
+ _dbus_assert (transaction != NULL);
+
+ service = _dbus_hash_table_lookup_string (registry->service_hash,
+ _dbus_string_get_const_data (service_name));
+ if (service != NULL)
+ return service;
+
+ service = _dbus_mem_pool_alloc (registry->service_pool);
+ if (service == NULL)
+ {
+ BUS_SET_OOM (error);
+ return NULL;
+ }
+
+ service->registry = registry;
+ service->refcount = 1;
+
+ _dbus_verbose ("copying string %p '%s' to service->name\n",
+ service_name, _dbus_string_get_const_data (service_name));
+ if (!_dbus_string_copy_data (service_name, &service->name))
+ {
+ _dbus_mem_pool_dealloc (registry->service_pool, service);
+ BUS_SET_OOM (error);
+ return NULL;
+ }
+ _dbus_verbose ("copied string %p '%s' to '%s'\n",
+ service_name, _dbus_string_get_const_data (service_name),
+ service->name);
+
+ if (!bus_driver_send_service_owner_changed (service->name,
+ NULL,
+ bus_connection_get_name (owner_connection_if_created),
+ transaction, error))
+ {
+ bus_service_unref (service);
+ return NULL;
+ }
+
+ if (!bus_activation_service_created (bus_context_get_activation (registry->context),
+ service->name, transaction, error))
+ {
+ bus_service_unref (service);
+ return NULL;
+ }
+
+ if (!bus_service_add_owner (service, owner_connection_if_created, flags,
+ transaction, error))
+ {
+ bus_service_unref (service);
+ return NULL;
+ }
+
+ if (!_dbus_hash_table_insert_string (registry->service_hash,
+ service->name,
+ service))
+ {
+ /* The add_owner gets reverted on transaction cancel */
+ BUS_SET_OOM (error);
+ return NULL;
+ }
+
+ return service;
+}
+
+void
+bus_registry_foreach (BusRegistry *registry,
+ BusServiceForeachFunction function,
+ void *data)
+{
+ DBusHashIter iter;
+
+ _dbus_hash_iter_init (registry->service_hash, &iter);
+ while (_dbus_hash_iter_next (&iter))
+ {
+ BusService *service = _dbus_hash_iter_get_value (&iter);
+
+ (* function) (service, data);
+ }
+}
+
+dbus_bool_t
+bus_registry_list_services (BusRegistry *registry,
+ char ***listp,
+ int *array_len)
+{
+ int i, j, len;
+ char **retval;
+ DBusHashIter iter;
+
+ len = _dbus_hash_table_get_n_entries (registry->service_hash);
+ retval = dbus_new (char *, len + 1);
+
+ if (retval == NULL)
+ return FALSE;
+
+ _dbus_hash_iter_init (registry->service_hash, &iter);
+ i = 0;
+ while (_dbus_hash_iter_next (&iter))
+ {
+ BusService *service = _dbus_hash_iter_get_value (&iter);
+
+ retval[i] = _dbus_strdup (service->name);
+ if (retval[i] == NULL)
+ goto error;
+
+ i++;
+ }
+
+ retval[i] = NULL;
+
+ if (array_len)
+ *array_len = len;
+
+ *listp = retval;
+ return TRUE;
+
+ error:
+ for (j = 0; j < i; j++)
+ dbus_free (retval[i]);
+ dbus_free (retval);
+
+ return FALSE;
+}
+
+dbus_bool_t
+bus_registry_acquire_service (BusRegistry *registry,
+ DBusConnection *connection,
+ const DBusString *service_name,
+ dbus_uint32_t flags,
+ dbus_uint32_t *result,
+ BusTransaction *transaction,
+ DBusError *error)
+{
+ dbus_bool_t retval;
+ DBusConnection *old_owner_conn;
+ DBusConnection *current_owner_conn;
+ BusClientPolicy *policy;
+ BusService *service;
+ BusActivation *activation;
+ BusSELinuxID *sid;
+ BusOwner *primary_owner;
+
+ retval = FALSE;
+
+ if (!_dbus_validate_bus_name (service_name, 0,
+ _dbus_string_get_length (service_name)))
+ {
+ dbus_set_error (error, DBUS_ERROR_INVALID_ARGS,
+ "Requested bus name \"%s\" is not valid",
+ _dbus_string_get_const_data (service_name));
+
+ _dbus_verbose ("Attempt to acquire invalid service name\n");
+
+ goto out;
+ }
+
+ if (_dbus_string_get_byte (service_name, 0) == ':')
+ {
+ /* Not allowed; only base services can start with ':' */
+ dbus_set_error (error, DBUS_ERROR_INVALID_ARGS,
+ "Cannot acquire a service starting with ':' such as \"%s\"",
+ _dbus_string_get_const_data (service_name));
+
+ _dbus_verbose ("Attempt to acquire invalid base service name \"%s\"",
+ _dbus_string_get_const_data (service_name));
+
+ goto out;
+ }
+
+ if (_dbus_string_equal_c_str (service_name, DBUS_SERVICE_DBUS))
+ {
+ dbus_set_error (error, DBUS_ERROR_INVALID_ARGS,
+ "Connection \"%s\" is not allowed to own the service \"%s\"because "
+ "it is reserved for D-Bus' use only",
+ bus_connection_is_active (connection) ?
+ bus_connection_get_name (connection) :
+ "(inactive)",
+ DBUS_SERVICE_DBUS);
+ goto out;
+ }
+
+ policy = bus_connection_get_policy (connection);
+ _dbus_assert (policy != NULL);
+
+ /* Note that if sid is #NULL then the bus's own context gets used
+ * in bus_connection_selinux_allows_acquire_service()
+ */
+ sid = bus_selinux_id_table_lookup (registry->service_sid_table,
+ service_name);
+
+ if (!bus_selinux_allows_acquire_service (connection, sid,
+ _dbus_string_get_const_data (service_name), error))
+ {
+
+ if (dbus_error_is_set (error) &&
+ dbus_error_has_name (error, DBUS_ERROR_NO_MEMORY))
+ {
+ goto out;
+ }
+
+ dbus_set_error (error, DBUS_ERROR_ACCESS_DENIED,
+ "Connection \"%s\" is not allowed to own the service \"%s\" due "
+ "to SELinux policy",
+ bus_connection_is_active (connection) ?
+ bus_connection_get_name (connection) :
+ "(inactive)",
+ _dbus_string_get_const_data (service_name));
+ goto out;
+ }
+
+ if (!bus_client_policy_check_can_own (policy, connection,
+ service_name))
+ {
+ dbus_set_error (error, DBUS_ERROR_ACCESS_DENIED,
+ "Connection \"%s\" is not allowed to own the service \"%s\" due "
+ "to security policies in the configuration file",
+ bus_connection_is_active (connection) ?
+ bus_connection_get_name (connection) :
+ "(inactive)",
+ _dbus_string_get_const_data (service_name));
+ goto out;
+ }
+
+ if (bus_connection_get_n_services_owned (connection) >=
+ bus_context_get_max_services_per_connection (registry->context))
+ {
+ dbus_set_error (error, DBUS_ERROR_LIMITS_EXCEEDED,
+ "Connection \"%s\" is not allowed to own more services "
+ "(increase limits in configuration file if required)",
+ bus_connection_is_active (connection) ?
+ bus_connection_get_name (connection) :
+ "(inactive)");
+ goto out;
+ }
+
+ service = bus_registry_lookup (registry, service_name);
+
+ if (service != NULL)
+ {
+ primary_owner = bus_service_get_primary_owner (service);
+ if (primary_owner != NULL)
+ old_owner_conn = primary_owner->conn;
+ else
+ old_owner_conn = NULL;
+ }
+ else
+ old_owner_conn = NULL;
+
+ if (service == NULL)
+ {
+ service = bus_registry_ensure (registry,
+ service_name, connection, flags,
+ transaction, error);
+ if (service == NULL)
+ goto out;
+ }
+
+ primary_owner = bus_service_get_primary_owner (service);
+ if (primary_owner == NULL)
+ goto out;
+
+ current_owner_conn = primary_owner->conn;
+
+ if (old_owner_conn == NULL)
+ {
+ _dbus_assert (current_owner_conn == connection);
+
+ *result = DBUS_REQUEST_NAME_REPLY_PRIMARY_OWNER;
+ }
+ else if (old_owner_conn == connection)
+ {
+ bus_owner_set_flags (primary_owner, flags);
+ *result = DBUS_REQUEST_NAME_REPLY_ALREADY_OWNER;
+ }
+ else if (((flags & DBUS_NAME_FLAG_DO_NOT_QUEUE) &&
+ !(bus_service_get_allow_replacement (service))) ||
+ ((flags & DBUS_NAME_FLAG_DO_NOT_QUEUE) &&
+ !(flags & DBUS_NAME_FLAG_REPLACE_EXISTING)))
+ {
+ DBusList *link;
+ BusOwner *temp_owner;
+ /* Since we can't be queued if we are already in the queue
+ remove us */
+
+ link = _bus_service_find_owner_link (service, connection);
+ if (link != NULL)
+ {
+ _dbus_list_unlink (&service->owners, link);
+ temp_owner = (BusOwner *)link->data;
+ bus_owner_unref (temp_owner);
+ _dbus_list_free_link (link);
+ }
+
+ *result = DBUS_REQUEST_NAME_REPLY_EXISTS;
+ }
+ else if (!(flags & DBUS_NAME_FLAG_DO_NOT_QUEUE) &&
+ (!(flags & DBUS_NAME_FLAG_REPLACE_EXISTING) ||
+ !(bus_service_get_allow_replacement (service))))
+ {
+ /* Queue the connection */
+ if (!bus_service_add_owner (service, connection,
+ flags,
+ transaction, error))
+ goto out;
+
+ *result = DBUS_REQUEST_NAME_REPLY_IN_QUEUE;
+ }
+ else
+ {
+ /* Replace the current owner */
+
+ /* We enqueue the new owner and remove the first one because
+ * that will cause NameAcquired and NameLost messages to
+ * be sent.
+ */
+
+ if (!bus_service_add_owner (service, connection,
+ flags,
+ transaction, error))
+ goto out;
+
+ if (primary_owner->do_not_queue)
+ {
+ if (!bus_service_remove_owner (service, old_owner_conn,
+ transaction, error))
+ goto out;
+ }
+ else
+ {
+ if (!bus_service_swap_owner (service, old_owner_conn,
+ transaction, error))
+ goto out;
+ }
+
+
+ _dbus_assert (connection == bus_service_get_primary_owner (service)->conn);
+ *result = DBUS_REQUEST_NAME_REPLY_PRIMARY_OWNER;
+ }
+
+ activation = bus_context_get_activation (registry->context);
+ retval = bus_activation_send_pending_auto_activation_messages (activation,
+ service,
+ transaction,
+ error);
+
+ out:
+ return retval;
+}
+
+dbus_bool_t
+bus_registry_release_service (BusRegistry *registry,
+ DBusConnection *connection,
+ const DBusString *service_name,
+ dbus_uint32_t *result,
+ BusTransaction *transaction,
+ DBusError *error)
+{
+ dbus_bool_t retval;
+ BusService *service;
+
+ retval = FALSE;
+
+ if (!_dbus_validate_bus_name (service_name, 0,
+ _dbus_string_get_length (service_name)))
+ {
+ dbus_set_error (error, DBUS_ERROR_INVALID_ARGS,
+ "Given bus name \"%s\" is not valid",
+ _dbus_string_get_const_data (service_name));
+
+ _dbus_verbose ("Attempt to release invalid service name\n");
+
+ goto out;
+ }
+
+ if (_dbus_string_get_byte (service_name, 0) == ':')
+ {
+ /* Not allowed; the base service name cannot be created or released */
+ dbus_set_error (error, DBUS_ERROR_INVALID_ARGS,
+ "Cannot release a service starting with ':' such as \"%s\"",
+ _dbus_string_get_const_data (service_name));
+
+ _dbus_verbose ("Attempt to release invalid base service name \"%s\"",
+ _dbus_string_get_const_data (service_name));
+
+ goto out;
+ }
+
+ if (_dbus_string_equal_c_str (service_name, DBUS_SERVICE_DBUS))
+ {
+ /* Not allowed; the base service name cannot be created or released */
+ dbus_set_error (error, DBUS_ERROR_INVALID_ARGS,
+ "Cannot release the %s service because it is owned by the bus",
+ DBUS_SERVICE_DBUS);
+
+ _dbus_verbose ("Attempt to release service name \"%s\"",
+ DBUS_SERVICE_DBUS);
+
+ goto out;
+ }
+
+ service = bus_registry_lookup (registry, service_name);
+
+ if (service == NULL)
+ {
+ *result = DBUS_RELEASE_NAME_REPLY_NON_EXISTENT;
+ }
+ else if (!bus_service_has_owner (service, connection))
+ {
+ *result = DBUS_RELEASE_NAME_REPLY_NOT_OWNER;
+ }
+ else
+ {
+ if (!bus_service_remove_owner (service, connection,
+ transaction, error))
+ goto out;
+
+ _dbus_assert (!bus_service_has_owner (service, connection));
+ *result = DBUS_RELEASE_NAME_REPLY_RELEASED;
+ }
+
+ retval = TRUE;
+
+ out:
+ return retval;
+}
+
+dbus_bool_t
+bus_registry_set_service_context_table (BusRegistry *registry,
+ DBusHashTable *table)
+{
+ DBusHashTable *new_table;
+ DBusHashIter iter;
+
+ new_table = bus_selinux_id_table_new ();
+ if (!new_table)
+ return FALSE;
+
+ _dbus_hash_iter_init (table, &iter);
+ while (_dbus_hash_iter_next (&iter))
+ {
+ const char *service = _dbus_hash_iter_get_string_key (&iter);
+ const char *context = _dbus_hash_iter_get_value (&iter);
+
+ if (!bus_selinux_id_table_insert (new_table,
+ service,
+ context))
+ return FALSE;
+ }
+
+ if (registry->service_sid_table)
+ _dbus_hash_table_unref (registry->service_sid_table);
+ registry->service_sid_table = new_table;
+ return TRUE;
+}
+
+static void
+bus_service_unlink_owner (BusService *service,
+ BusOwner *owner)
+{
+ _dbus_list_remove_last (&service->owners, owner);
+ bus_owner_unref (owner);
+}
+
+static void
+bus_service_unlink (BusService *service)
+{
+ _dbus_assert (service->owners == NULL);
+
+ /* the service may not be in the hash, if
+ * the failure causing transaction cancel
+ * was in the right place, but that's OK
+ */
+ _dbus_hash_table_remove_string (service->registry->service_hash,
+ service->name);
+
+ bus_service_unref (service);
+}
+
+static void
+bus_service_relink (BusService *service,
+ DBusPreallocatedHash *preallocated)
+{
+ _dbus_assert (service->owners == NULL);
+ _dbus_assert (preallocated != NULL);
+
+ _dbus_hash_table_insert_string_preallocated (service->registry->service_hash,
+ preallocated,
+ service->name,
+ service);
+
+ bus_service_ref (service);
+}
+
+/**
+ * Data used to represent an ownership cancellation in
+ * a bus transaction.
+ */
+typedef struct
+{
+ BusOwner *owner; /**< the owner */
+ BusService *service; /**< service to cancel ownership of */
+} OwnershipCancelData;
+
+static void
+cancel_ownership (void *data)
+{
+ OwnershipCancelData *d = data;
+
+ /* We don't need to send messages notifying of these
+ * changes, since we're reverting something that was
+ * cancelled (effectively never really happened)
+ */
+ bus_service_unlink_owner (d->service, d->owner);
+
+ if (d->service->owners == NULL)
+ bus_service_unlink (d->service);
+}
+
+static void
+free_ownership_cancel_data (void *data)
+{
+ OwnershipCancelData *d = data;
+
+ dbus_connection_unref (d->owner->conn);
+ bus_owner_unref (d->owner);
+ bus_service_unref (d->service);
+
+ dbus_free (d);
+}
+
+static dbus_bool_t
+add_cancel_ownership_to_transaction (BusTransaction *transaction,
+ BusService *service,
+ BusOwner *owner)
+{
+ OwnershipCancelData *d;
+
+ d = dbus_new (OwnershipCancelData, 1);
+ if (d == NULL)
+ return FALSE;
+
+ d->service = service;
+ d->owner = owner;
+
+ if (!bus_transaction_add_cancel_hook (transaction, cancel_ownership, d,
+ free_ownership_cancel_data))
+ {
+ dbus_free (d);
+ return FALSE;
+ }
+
+ bus_service_ref (d->service);
+ bus_owner_ref (owner);
+ dbus_connection_ref (d->owner->conn);
+
+ return TRUE;
+}
+
+/* this function is self-cancelling if you cancel the transaction */
+dbus_bool_t
+bus_service_add_owner (BusService *service,
+ DBusConnection *connection,
+ dbus_uint32_t flags,
+ BusTransaction *transaction,
+ DBusError *error)
+{
+ BusOwner *bus_owner;
+ DBusList *bus_owner_link;
+
+ _DBUS_ASSERT_ERROR_IS_CLEAR (error);
+
+ /* Send service acquired message first, OOM will result
+ * in cancelling the transaction
+ */
+ if (service->owners == NULL)
+ {
+ if (!bus_driver_send_service_acquired (connection, service->name, transaction, error))
+ return FALSE;
+ }
+
+ bus_owner_link = _bus_service_find_owner_link (service, connection);
+
+ if (bus_owner_link == NULL)
+ {
+ bus_owner = bus_owner_new (service, connection, flags);
+ if (bus_owner == NULL)
+ {
+ BUS_SET_OOM (error);
+ return FALSE;
+ }
+
+ bus_owner_set_flags (bus_owner, flags);
+ if (!(flags & DBUS_NAME_FLAG_REPLACE_EXISTING) || service->owners == NULL)
+ {
+ if (!_dbus_list_append (&service->owners,
+ bus_owner))
+ {
+ bus_owner_unref (bus_owner);
+ BUS_SET_OOM (error);
+ return FALSE;
+ }
+ }
+ else
+ {
+ if (!_dbus_list_insert_after (&service->owners,
+ _dbus_list_get_first_link (&service->owners),
+ bus_owner))
+ {
+ bus_owner_unref (bus_owner);
+ BUS_SET_OOM (error);
+ return FALSE;
+ }
+ }
+ }
+ else
+ {
+ /* Update the link since we are already in the queue
+ * No need for operations that can produce OOM
+ */
+
+ bus_owner = (BusOwner *) bus_owner_link->data;
+ if (flags & DBUS_NAME_FLAG_REPLACE_EXISTING)
+ {
+ DBusList *link;
+ _dbus_list_unlink (&service->owners, bus_owner_link);
+ link = _dbus_list_get_first_link (&service->owners);
+ _dbus_assert (link != NULL);
+
+ _dbus_list_insert_after_link (&service->owners, link, bus_owner_link);
+ }
+
+ bus_owner_set_flags (bus_owner, flags);
+ return TRUE;
+ }
+
+ if (!add_cancel_ownership_to_transaction (transaction,
+ service,
+ bus_owner))
+ {
+ bus_service_unlink_owner (service, bus_owner);
+ BUS_SET_OOM (error);
+ return FALSE;
+ }
+
+ return TRUE;
+}
+
+typedef struct
+{
+ BusOwner *owner;
+ BusService *service;
+ BusOwner *before_owner; /* restore to position before this connection in owners list */
+ DBusList *owner_link;
+ DBusList *service_link;
+ DBusPreallocatedHash *hash_entry;
+} OwnershipRestoreData;
+
+static void
+restore_ownership (void *data)
+{
+ OwnershipRestoreData *d = data;
+ DBusList *link;
+
+ _dbus_assert (d->service_link != NULL);
+ _dbus_assert (d->owner_link != NULL);
+
+ if (d->service->owners == NULL)
+ {
+ _dbus_assert (d->hash_entry != NULL);
+ bus_service_relink (d->service, d->hash_entry);
+ }
+ else
+ {
+ _dbus_assert (d->hash_entry == NULL);
+ }
+
+ /* We don't need to send messages notifying of these
+ * changes, since we're reverting something that was
+ * cancelled (effectively never really happened)
+ */
+ link = _dbus_list_get_first_link (&d->service->owners);
+ while (link != NULL)
+ {
+ if (link->data == d->before_owner)
+ break;
+
+ link = _dbus_list_get_next_link (&d->service->owners, link);
+ }
+
+ _dbus_list_insert_before_link (&d->service->owners, link, d->owner_link);
+
+ /* Note that removing then restoring this changes the order in which
+ * ServiceDeleted messages are sent on destruction of the
+ * connection. This should be OK as the only guarantee there is
+ * that the base service is destroyed last, and we never even
+ * tentatively remove the base service.
+ */
+ bus_connection_add_owned_service_link (d->owner->conn, d->service_link);
+
+ d->hash_entry = NULL;
+ d->service_link = NULL;
+ d->owner_link = NULL;
+}
+
+static void
+free_ownership_restore_data (void *data)
+{
+ OwnershipRestoreData *d = data;
+
+ if (d->service_link)
+ _dbus_list_free_link (d->service_link);
+ if (d->owner_link)
+ _dbus_list_free_link (d->owner_link);
+ if (d->hash_entry)
+ _dbus_hash_table_free_preallocated_entry (d->service->registry->service_hash,
+ d->hash_entry);
+
+ dbus_connection_unref (d->owner->conn);
+ bus_owner_unref (d->owner);
+ bus_service_unref (d->service);
+
+ dbus_free (d);
+}
+
+static dbus_bool_t
+add_restore_ownership_to_transaction (BusTransaction *transaction,
+ BusService *service,
+ BusOwner *owner)
+{
+ OwnershipRestoreData *d;
+ DBusList *link;
+
+ d = dbus_new (OwnershipRestoreData, 1);
+ if (d == NULL)
+ return FALSE;
+
+ d->service = service;
+ d->owner = owner;
+ d->service_link = _dbus_list_alloc_link (service);
+ d->owner_link = _dbus_list_alloc_link (owner);
+ d->hash_entry = _dbus_hash_table_preallocate_entry (service->registry->service_hash);
+
+ bus_service_ref (d->service);
+ bus_owner_ref (d->owner);
+ dbus_connection_ref (d->owner->conn);
+
+ d->before_owner = NULL;
+ link = _dbus_list_get_first_link (&service->owners);
+ while (link != NULL)
+ {
+ if (link->data == owner)
+ {
+ link = _dbus_list_get_next_link (&service->owners, link);
+
+ if (link)
+ d->before_owner = link->data;
+
+ break;
+ }
+
+ link = _dbus_list_get_next_link (&service->owners, link);
+ }
+
+ if (d->service_link == NULL ||
+ d->owner_link == NULL ||
+ d->hash_entry == NULL ||
+ !bus_transaction_add_cancel_hook (transaction, restore_ownership, d,
+ free_ownership_restore_data))
+ {
+ free_ownership_restore_data (d);
+ return FALSE;
+ }
+
+ return TRUE;
+}
+
+dbus_bool_t
+bus_service_swap_owner (BusService *service,
+ DBusConnection *connection,
+ BusTransaction *transaction,
+ DBusError *error)
+{
+ DBusList *swap_link;
+ BusOwner *primary_owner;
+
+ _DBUS_ASSERT_ERROR_IS_CLEAR (error);
+
+ /* We send out notifications before we do any work we
+ * might have to undo if the notification-sending failed
+ */
+
+ /* Send service lost message */
+ primary_owner = bus_service_get_primary_owner (service);
+ if (primary_owner == NULL || primary_owner->conn != connection)
+ _dbus_assert_not_reached ("Tried to swap a non primary owner");
+
+
+ if (!bus_driver_send_service_lost (connection, service->name,
+ transaction, error))
+ return FALSE;
+
+ if (service->owners == NULL)
+ {
+ _dbus_assert_not_reached ("Tried to swap owner of a service that has no owners");
+ }
+ else if (_dbus_list_length_is_one (&service->owners))
+ {
+ _dbus_assert_not_reached ("Tried to swap owner of a service that has no other owners in the queue");
+ }
+ else
+ {
+ DBusList *link;
+ BusOwner *new_owner;
+ DBusConnection *new_owner_conn;
+ link = _dbus_list_get_first_link (&service->owners);
+ _dbus_assert (link != NULL);
+ link = _dbus_list_get_next_link (&service->owners, link);
+ _dbus_assert (link != NULL);
+
+ new_owner = (BusOwner *)link->data;
+ new_owner_conn = new_owner->conn;
+
+ if (!bus_driver_send_service_owner_changed (service->name,
+ bus_connection_get_name (connection),
+ bus_connection_get_name (new_owner_conn),
+ transaction, error))
+ return FALSE;
+
+ /* This will be our new owner */
+ if (!bus_driver_send_service_acquired (new_owner_conn,
+ service->name,
+ transaction,
+ error))
+ return FALSE;
+ }
+
+ if (!add_restore_ownership_to_transaction (transaction, service, primary_owner))
+ {
+ BUS_SET_OOM (error);
+ return FALSE;
+ }
+
+ /* unlink the primary and make it the second link */
+ swap_link = _dbus_list_get_first_link (&service->owners);
+ _dbus_list_unlink (&service->owners, swap_link);
+
+ _dbus_list_insert_after_link (&service->owners,
+ _dbus_list_get_first_link (&service->owners),
+ swap_link);
+
+ return TRUE;
+}
+
+/* this function is self-cancelling if you cancel the transaction */
+dbus_bool_t
+bus_service_remove_owner (BusService *service,
+ DBusConnection *connection,
+ BusTransaction *transaction,
+ DBusError *error)
+{
+ BusOwner *primary_owner;
+
+ _DBUS_ASSERT_ERROR_IS_CLEAR (error);
+
+ /* We send out notifications before we do any work we
+ * might have to undo if the notification-sending failed
+ */
+
+ /* Send service lost message */
+ primary_owner = bus_service_get_primary_owner (service);
+ if (primary_owner != NULL && primary_owner->conn == connection)
+ {
+ if (!bus_driver_send_service_lost (connection, service->name,
+ transaction, error))
+ return FALSE;
+ }
+ else
+ {
+ /* if we are not the primary owner then just remove us from the queue */
+ DBusList *link;
+ BusOwner *temp_owner;
+
+ link = _bus_service_find_owner_link (service, connection);
+ _dbus_list_unlink (&service->owners, link);
+ temp_owner = (BusOwner *)link->data;
+ bus_owner_unref (temp_owner);
+ _dbus_list_free_link (link);
+
+ return TRUE;
+ }
+
+ if (service->owners == NULL)
+ {
+ _dbus_assert_not_reached ("Tried to remove owner of a service that has no owners");
+ }
+ else if (_dbus_list_length_is_one (&service->owners))
+ {
+ if (!bus_driver_send_service_owner_changed (service->name,
+ bus_connection_get_name (connection),
+ NULL,
+ transaction, error))
+ return FALSE;
+ }
+ else
+ {
+ DBusList *link;
+ BusOwner *new_owner;
+ DBusConnection *new_owner_conn;
+ link = _dbus_list_get_first_link (&service->owners);
+ _dbus_assert (link != NULL);
+ link = _dbus_list_get_next_link (&service->owners, link);
+ _dbus_assert (link != NULL);
+
+ new_owner = (BusOwner *)link->data;
+ new_owner_conn = new_owner->conn;
+
+ if (!bus_driver_send_service_owner_changed (service->name,
+ bus_connection_get_name (connection),
+ bus_connection_get_name (new_owner_conn),
+ transaction, error))
+ return FALSE;
+
+ /* This will be our new owner */
+ if (!bus_driver_send_service_acquired (new_owner_conn,
+ service->name,
+ transaction,
+ error))
+ return FALSE;
+ }
+
+ if (!add_restore_ownership_to_transaction (transaction, service, primary_owner))
+ {
+ BUS_SET_OOM (error);
+ return FALSE;
+ }
+
+ bus_service_unlink_owner (service, primary_owner);
+
+ if (service->owners == NULL)
+ bus_service_unlink (service);
+
+ return TRUE;
+}
+
+BusService *
+bus_service_ref (BusService *service)
+{
+ _dbus_assert (service->refcount > 0);
+
+ service->refcount += 1;
+
+ return service;
+}
+
+void
+bus_service_unref (BusService *service)
+{
+ _dbus_assert (service->refcount > 0);
+
+ service->refcount -= 1;
+
+ if (service->refcount == 0)
+ {
+ _dbus_assert (service->owners == NULL);
+
+ dbus_free (service->name);
+ _dbus_mem_pool_dealloc (service->registry->service_pool, service);
+ }
+}
+
+DBusConnection *
+bus_service_get_primary_owners_connection (BusService *service)
+{
+ BusOwner *owner;
+
+ owner = bus_service_get_primary_owner (service);
+
+ if (owner != NULL)
+ return owner->conn;
+ else
+ return NULL;
+}
+
+BusOwner*
+bus_service_get_primary_owner (BusService *service)
+{
+ return _dbus_list_get_first (&service->owners);
+}
+
+const char*
+bus_service_get_name (BusService *service)
+{
+ return service->name;
+}
+
+dbus_bool_t
+bus_service_get_allow_replacement (BusService *service)
+{
+ BusOwner *owner;
+ DBusList *link;
+
+ _dbus_assert (service->owners != NULL);
+
+ link = _dbus_list_get_first_link (&service->owners);
+ owner = (BusOwner *) link->data;
+
+ return owner->allow_replacement;
+}
+
+dbus_bool_t
+bus_service_has_owner (BusService *service,
+ DBusConnection *connection)
+{
+ DBusList *link;
+
+ link = _bus_service_find_owner_link (service, connection);
+
+ if (link == NULL)
+ return FALSE;
+ else
+ return TRUE;
+}
+
+dbus_bool_t
+bus_service_list_queued_owners (BusService *service,
+ DBusList **return_list,
+ DBusError *error)
+{
+ DBusList *link;
+
+ _dbus_assert (*return_list == NULL);
+
+ link = _dbus_list_get_first_link (&service->owners);
+ _dbus_assert (link != NULL);
+
+ while (link != NULL)
+ {
+ BusOwner *owner;
+ const char *uname;
+
+ owner = (BusOwner *) link->data;
+ uname = bus_connection_get_name (owner->conn);
+
+ if (!_dbus_list_append (return_list, (char *)uname))
+ goto oom;
+
+ link = _dbus_list_get_next_link (&service->owners, link);
+ }
+
+ return TRUE;
+
+ oom:
+ _dbus_list_clear (return_list);
+ BUS_SET_OOM (error);
+ return FALSE;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-24 18:57:32 +0000