/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
/* connection.c Client connections
*
* Copyright (C) 2003 Red Hat, Inc.
*
* 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 <config.h>
#include "connection.h"
#include "dispatch.h"
#include "policy.h"
#include "services.h"
#include "utils.h"
#include "signals.h"
#include "expirelist.h"
#include "selinux.h"
#include <dbus/dbus-list.h>
#include <dbus/dbus-hash.h>
#include <dbus/dbus-timeout.h>
/* Trim executed commands to this length; we want to keep logs readable */
#define MAX_LOG_COMMAND_LEN 50
static void bus_connection_remove_transactions (DBusConnection *connection);
typedef struct
{
BusExpireItem expire_item;
DBusConnection *will_get_reply;
DBusConnection *will_send_reply;
dbus_uint32_t reply_serial;
} BusPendingReply;
struct BusConnections
{
int refcount;
DBusList *completed; /**< List of all completed connections */
int n_completed; /**< Length of completed list */
DBusList *incomplete; /**< List of all not-yet-active connections */
int n_incomplete; /**< Length of incomplete list */
BusContext *context;
DBusHashTable *completed_by_user; /**< Number of completed connections for each UID */
DBusTimeout *expire_timeout; /**< Timeout for expiring incomplete connections. */
int stamp; /**< Incrementing number */
BusExpireList *pending_replies; /**< List of pending replies */
#ifdef DBUS_ENABLE_STATS
int total_match_rules;
int peak_match_rules;
int peak_match_rules_per_conn;
int total_bus_names;
int peak_bus_names;
int peak_bus_names_per_conn;
#endif
};
static dbus_int32_t connection_data_slot = -1;
typedef struct
{
BusConnections *connections;
DBusList *link_in_connection_list;
DBusConnection *connection;
DBusList *services_owned;
int n_services_owned;
DBusList *match_rules;
int n_match_rules;
char *name;
DBusList *transaction_messages; /**< Stuff we need to send as part of a transaction */
DBusMessage *oom_message;
DBusPreallocatedSend *oom_preallocated;
BusClientPolicy *policy;
char *cached_loginfo_string;
BusSELinuxID *selinux_id;
long connection_tv_sec; /**< Time when we connected (seconds component) */
long connection_tv_usec; /**< Time when we connected (microsec component) */
int stamp; /**< connections->stamp last time we were traversed */
#ifdef DBUS_ENABLE_STATS
int peak_match_rules;
int peak_bus_names;
#endif
} BusConnectionData;
static dbus_bool_t bus_pending_reply_expired (BusExpireList *list,
DBusList *link,
void *data);
static void bus_connection_drop_pending_replies (BusConnections *connections,
DBusConnection *connection);
static dbus_bool_t expire_incomplete_timeout (void *data);
#define BUS_CONNECTION_DATA(connection) (dbus_connection_get_data ((connection), connection_data_slot))
static DBusLoop*
connection_get_loop (DBusConnection *connection)
{
BusConnectionData *d;
d = BUS_CONNECTION_DATA (connection);
return bus_context_get_loop (d->connections->context);
}
static int
get_connections_for_uid (BusConnections *connections,
dbus_uid_t uid)
{
void *val;
int current_count;
/* val is NULL is 0 when it isn't in the hash yet */
val = _dbus_hash_table_lookup_uintptr (connections->completed_by_user,
uid);
current_count = _DBUS_POINTER_TO_INT (val);
return current_count;
}
static dbus_bool_t
adjust_connections_for_uid (BusConnections *connections,
dbus_uid_t uid,
int adjustment)
{
int current_count;
current_count = get_connections_for_uid (connections, uid);
_dbus_verbose ("Adjusting connection count for UID " DBUS_UID_FORMAT
": was %d adjustment %d making %d\n",
uid, current_count, adjustment, current_count + adjustment);
_dbus_assert (current_count >= 0);
current_count += adjustment;
_dbus_assert (current_count >= 0);
if (current_count == 0)
{
_dbus_hash_table_remove_uintptr (connections->completed_by_user, uid);
return TRUE;
}
else
{
dbus_bool_t retval;
retval = _dbus_hash_table_insert_uintptr (connections->completed_by_user,
uid, _DBUS_INT_TO_POINTER (current_count));
/* only positive adjustment can fail as otherwise
* a hash entry should already exist
*/
_dbus_assert (adjustment > 0 ||
(adjustment <= 0 && retval));
return retval;
}
}
void
bus_connection_disconnected (DBusConnection *connection)
{
BusConnectionData *d;
BusService *service;
BusMatchmaker *matchmaker;
d = BUS_CONNECTION_DATA (connection);
_dbus_assert (d != NULL);
_dbus_verbose ("%s disconnected, dropping all service ownership and releasing\n",
d->name ? d->name : "(inactive)");
/* Delete our match rules */
if (d->n_match_rules > 0)
{
matchmaker = bus_context_get_matchmaker (d->connections->context);
bus_matchmaker_disconnected (matchmaker, connection);
}
/* Drop any service ownership. Unfortunately, this requires
* memory allocation and there doesn't seem to be a good way to
* handle it other than sleeping; we can't "fail" the operation of
* disconnecting a client, and preallocating a broadcast "service is
* now gone" message for every client-service pair seems kind of
* involved.
*/
while ((service = _dbus_list_get_last (&d->services_owned)))
{
BusTransaction *transaction;
DBusError error;
retry:
dbus_error_init (&error);
while ((transaction = bus_transaction_new (d->connections->context)) == NULL)
_dbus_wait_for_memory ();
if (!bus_service_remove_owner (service, connection,
transaction, &error))
{
_DBUS_ASSERT_ERROR_IS_SET (&error);
if (dbus_error_has_name (&error, DBUS_ERROR_NO_MEMORY))
{
dbus_error_free (&error);
bus_transaction_cancel_and_free (transaction);
_dbus_wait_for_memory ();
goto retry;
}
else
{
_dbus_verbose ("Failed to remove service owner: %s %s\n",
error.name, error.message);
_dbus_assert_not_reached ("Removing service owner failed for non-memory-related reason");
}
}
bus_transaction_execute_and_free (transaction);
}
bus_dispatch_remove_connection (connection);
/* no more watching */
if (!dbus_connection_set_watch_functions (connection,
NULL, NULL, NULL,
connection,
NULL))
_dbus_assert_not_reached ("setting watch functions to NULL failed");
if (!dbus_connection_set_timeout_functions (connection,
NULL, NULL, NULL,
connection,
NULL))
_dbus_assert_not_reached ("setting timeout functions to NULL failed");
dbus_connection_set_unix_user_function (connection,
NULL, NULL, NULL);
dbus_connection_set_windows_user_function (connection,
NULL, NULL, NULL);
dbus_connection_set_dispatch_status_function (connection,
NULL, NULL, NULL);
bus_connection_remove_transactions (connection);
if (d->link_in_connection_list != NULL)
{
if (d->name != NULL)
{
unsigned long uid;
_dbus_list_remove_link (&d->connections->completed, d->link_in_connection_list);
d->link_in_connection_list = NULL;
d->connections->n_completed -= 1;
if (dbus_connection_get_unix_user (connection, &uid))
{
if (!adjust_connections_for_uid (d->connections,
uid, -1))
_dbus_assert_not_reached ("adjusting downward should never fail");
}
}
else
{
_dbus_list_remove_link (&d->connections->incomplete, d->link_in_connection_list);
d->link_in_connection_list = NULL;
d->connections->n_incomplete -= 1;
}
_dbus_assert (d->connections->n_incomplete >= 0);
_dbus_assert (d->connections->n_completed >= 0);
}
bus_connection_drop_pending_replies (d->connections, connection);
/* frees "d" as side effect */
dbus_connection_set_data (connection,
connection_data_slot,
NULL, NULL);
dbus_connection_unref (connection);
}
static dbus_bool_t
add_connection_watch (DBusWatch *watch,
void *data)
{
DBusConnection *connection = data;
return _dbus_loop_add_watch (connection_get_loop (connection), watch);
}
static void
remove_connection_watch (DBusWatch *watch,
void *data)
{
DBusConnection *connection = data;
_dbus_loop_remove_watch (connection_get_loop (connection), watch);
}
static void
toggle_connection_watch (DBusWatch *watch,
void *data)
{
DBusConnection *connection = data;
_dbus_loop_toggle_watch (connection_get_loop (connection), watch);
}
static dbus_bool_t
add_connection_timeout (DBusTimeout *timeout,
void *data)
{
DBusConnection *connection = data;
return _dbus_loop_add_timeout (connection_get_loop (connection), timeout);
}
static void
remove_connection_timeout (DBusTimeout *timeout,
void *data)
{
DBusConnection *connection = data;
_dbus_loop_remove_timeout (connection_get_loop (connection), timeout);
}
static void
dispatch_status_function (DBusConnection *connection,
DBusDispatchStatus new_status,
void *data)
{
DBusLoop *loop = data;
if (new_status != DBUS_DISPATCH_COMPLETE)
{
while (!_dbus_loop_queue_dispatch (loop, connection))
_dbus_wait_for_memory ();
}
}
static dbus_bool_t
allow_unix_user_function (DBusConnection *connection,
unsigned long uid,
void *data)
{
BusConnectionData *d;
d = BUS_CONNECTION_DATA (connection);
_dbus_assert (d != NULL);
return bus_context_allow_unix_user (d->connections->context, uid);
}
static void
free_connection_data (void *data)
{
BusConnectionData *d = data;
/* services_owned should be NULL since we should be disconnected */
_dbus_assert (d->services_owned == NULL);
_dbus_assert (d->n_services_owned == 0);
/* similarly */
_dbus_assert (d->transaction_messages == NULL);
if (d->oom_preallocated)
dbus_connection_free_preallocated_send (d->connection, d->oom_preallocated);
if (d->oom_message)
dbus_message_unref (d->oom_message);
if (d->policy)
bus_client_policy_unref (d->policy);
if (d->selinux_id)
bus_selinux_id_unref (d->selinux_id);
dbus_free (d->cached_loginfo_string);
dbus_free (d->name);
dbus_free (d);
}
BusConnections*
bus_connections_new (BusContext *context)
{
BusConnections *connections;
if (!dbus_connection_allocate_data_slot (&connection_data_slot))
goto failed_0;
connections = dbus_new0 (BusConnections, 1);
if (connections == NULL)
goto failed_1;
connections->completed_by_user = _dbus_hash_table_new (DBUS_HASH_UINTPTR,
NULL, NULL);
if (connections->completed_by_user == NULL)
goto failed_2;
connections->expire_timeout = _dbus_timeout_new (100, /* irrelevant */
expire_incomplete_timeout,
connections, NULL);
if (connections->expire_timeout == NULL)
goto failed_3;
_dbus_timeout_set_enabled (connections->expire_timeout, FALSE);
connections->pending_replies = bus_expire_list_new (bus_context_get_loop (context),
bus_context_get_reply_timeout (context),
bus_pending_reply_expired,
connections);
if (connections->pending_replies == NULL)
goto failed_4;
if (!_dbus_loop_add_timeout (bus_context_get_loop (context),
connections->expire_timeout))
goto failed_5;
connections->refcount = 1;
connections->context = context;
return connections;
failed_5:
bus_expire_list_free (connections->pending_replies);
failed_4:
_dbus_timeout_unref (connections->expire_timeout);
failed_3:
_dbus_hash_table_unref (connections->completed_by_user);
failed_2:
dbus_free (connections);
failed_1:
dbus_connection_free_data_slot (&connection_data_slot);
failed_0:
return NULL;
}
BusConnections *
bus_connections_ref (BusConnections *connections)
{
_dbus_assert (connections->refcount > 0);
connections->refcount += 1;
return connections;
}
void
bus_connections_unref (BusConnections *connections)
{
_dbus_assert (connections->refcount > 0);
connections->refcount -= 1;
if (connections->refcount == 0)
{
/* drop all incomplete */
while (connections->incomplete != NULL)
{
DBusConnection *connection;
connection = connections->incomplete->data;
dbus_connection_ref (connection);
dbus_connection_close (connection);
bus_connection_disconnected (connection);
dbus_connection_unref (connection);
}
_dbus_assert (connections->n_incomplete == 0);
/* drop all real connections */
while (connections->completed != NULL)
{
DBusConnection *connection;
connection = connections->completed->data;
dbus_connection_ref (connection);
dbus_connection_close (connection);
bus_connection_disconnected (connection);
dbus_connection_unref (connection);
}
_dbus_assert (connections->n_completed == 0);
bus_expire_list_free (connections->pending_replies);
_dbus_loop_remove_timeout (bus_context_get_loop (connections->context),
connections->expire_timeout);
_dbus_timeout_unref (connections->expire_timeout);
_dbus_hash_table_unref (connections->completed_by_user);
dbus_free (connections);
dbus_connection_free_data_slot (&connection_data_slot);
}
}
/* Used for logging */
static dbus_bool_t
cache_peer_loginfo_string (BusConnectionData *d,
DBusConnection *connection)
{
DBusString loginfo_buf;
unsigned long uid;
unsigned long pid;
char *windows_sid;
dbus_bool_t prev_added;
if (!_dbus_string_init (&loginfo_buf))
return FALSE;
prev_added = FALSE;
if (dbus_connection_get_unix_user (connection, &uid))
{
if (!_dbus_string_append_printf (&loginfo_buf, "uid=%ld", uid))
goto oom;
else
prev_added = TRUE;
}
if (dbus_connection_get_unix_process_id (connection, &pid))
{
if (prev_added)
{
if (!_dbus_string_append_byte (&loginfo_buf, ' '))
goto oom;
}
if (!_dbus_string_append_printf (&loginfo_buf, "pid=%ld comm=\"", pid))
goto oom;
/* Ignore errors here; we may not have permissions to read the
* proc file. */
_dbus_command_for_pid (pid, &loginfo_buf, MAX_LOG_COMMAND_LEN, NULL);
if (!_dbus_string_append_byte (&loginfo_buf, '"'))
goto oom;
}
if (dbus_connection_get_windows_user (connection, &windows_sid))
{
dbus_bool_t did_append;
did_append = _dbus_string_append_printf (&loginfo_buf,
"sid=\"%s\" ", windows_sid);
dbus_free (windows_sid);
if (!did_append)
goto oom;
}
if (!_dbus_string_steal_data (&loginfo_buf, &(d->cached_loginfo_string)))
goto oom;
_dbus_string_free (&loginfo_buf);
return TRUE;
oom:
_dbus_string_free (&loginfo_buf);
return FALSE;
}
dbus_bool_t
bus_connections_setup_connection (BusConnections *connections,
DBusConnection *connection)
{
BusConnectionData *d;
dbus_bool_t retval;
DBusError error;
d = dbus_new0 (BusConnectionData, 1);
if (d == NULL)
return FALSE;
d->connections = connections;
d->connection = connection;
_dbus_get_monotonic_time (&d->connection_tv_sec,
&d->connection_tv_usec);
_dbus_assert (connection_data_slot >= 0);
if (!dbus_connection_set_data (connection,
connection_data_slot,
d, free_connection_data))
{
dbus_free (d);
return FALSE;
}
dbus_connection_set_route_peer_messages (connection, TRUE);
retval = FALSE;
dbus_error_init (&error);
d->selinux_id = bus_selinux_init_connection_id (connection,
&error);
if (dbus_error_is_set (&error))
{
/* This is a bit bogus because we pretend all errors
* are OOM; this is done because we know that in bus.c
* an OOM error disconnects the connection, which is
* the same thing we want on any other error.
*/
dbus_error_free (&error);
goto out;
}
if (!dbus_connection_set_watch_functions (connection,
add_connection_watch,
remove_connection_watch,
toggle_connection_watch,
connection,
NULL))
goto out;
if (!dbus_connection_set_timeout_functions (connection,
add_connection_timeout,
remove_connection_timeout,
NULL,
connection, NULL))
goto out;
/* For now we don't need to set a Windows user function because
* there are no policies in the config file controlling what
* Windows users can connect. The default 'same user that owns the
* bus can connect' behavior of DBusConnection is fine on Windows.
*/
dbus_connection_set_unix_user_function (connection,
allow_unix_user_function,
NULL, NULL);
dbus_connection_set_dispatch_status_function (connection,
dispatch_status_function,
bus_context_get_loop (connections->context),
NULL);
d->link_in_connection_list = _dbus_list_alloc_link (connection);
if (d->link_in_connection_list == NULL)
goto out;
/* Setup the connection with the dispatcher */
if (!bus_dispatch_add_connection (connection))
goto out;
if (dbus_connection_get_dispatch_status (connection) != DBUS_DISPATCH_COMPLETE)
{
if (!_dbus_loop_queue_dispatch (bus_context_get_loop (connections->context), connection))
{
bus_dispatch_remove_connection (connection);
goto out;
}
}
_dbus_list_append_link (&connections->incomplete, d->link_in_connection_list);
connections->n_incomplete += 1;
dbus_connection_ref (connection);
/* Note that we might disconnect ourselves here, but it only takes
* effect on return to the main loop. We call this to free up
* expired connections if possible, and to queue the timeout for our
* own expiration.
*/
bus_connections_expire_incomplete (connections);
/* And we might also disconnect ourselves here, but again it
* only takes effect on return to main loop.
*/
if (connections->n_incomplete >
bus_context_get_max_incomplete_connections (connections->context))
{
_dbus_verbose ("Number of incomplete connections exceeds max, dropping oldest one\n");
_dbus_assert (connections->incomplete != NULL);
/* Disconnect the oldest unauthenticated connection. FIXME
* would it be more secure to drop a *random* connection? This
* algorithm seems to mean that if someone can create new
* connections quickly enough, they can keep anyone else from
* completing authentication. But random may or may not really
* help with that, a more elaborate solution might be required.
*/
dbus_connection_close (connections->incomplete->data);
}
retval = TRUE;
out:
if (!retval)
{
if (d->selinux_id)
bus_selinux_id_unref (d->selinux_id);
d->selinux_id = NULL;
if (!dbus_connection_set_watch_functions (connection,
NULL, NULL, NULL,
connection,
NULL))
_dbus_assert_not_reached ("setting watch functions to NULL failed");
if (!dbus_connection_set_timeout_functions (connection,
NULL, NULL, NULL,
connection,
NULL))
_dbus_assert_not_reached ("setting timeout functions to NULL failed");
dbus_connection_set_unix_user_function (connection,
NULL, NULL, NULL);
dbus_connection_set_windows_user_function (connection,
NULL, NULL, NULL);
dbus_connection_set_dispatch_status_function (connection,
NULL, NULL, NULL);
if (d->link_in_connection_list != NULL)
{
_dbus_assert (d->link_in_connection_list->next == NULL);
_dbus_assert (d->link_in_connection_list->prev == NULL);
_dbus_list_free_link (d->link_in_connection_list);
d->link_in_connection_list = NULL;
}
if (!dbus_connection_set_data (connection,
connection_data_slot,
NULL, NULL))
_dbus_assert_not_reached ("failed to set connection data to null");
/* "d" has now been freed */
}
return retval;
}
void
bus_connections_expire_incomplete (BusConnections *connections)
{
int next_interval;
next_interval = -1;
if (connections->incomplete != NULL)
{
long tv_sec, tv_usec;
DBusList *link;
int auth_timeout;
_dbus_get_monotonic_time (&tv_sec, &tv_usec);
auth_timeout = bus_context_get_auth_timeout (connections->context);
link = _dbus_list_get_first_link (&connections->incomplete);
while (link != NULL)
{
DBusList *next = _dbus_list_get_next_link (&connections->incomplete, link);
DBusConnection *connection;
BusConnectionData *d;
double elapsed;
connection = link->data;
d = BUS_CONNECTION_DATA (connection);
_dbus_assert (d != NULL);
elapsed = ELAPSED_MILLISECONDS_SINCE (d->connection_tv_sec,
d->connection_tv_usec,
tv_sec, tv_usec);
if (elapsed >= (double) auth_timeout)
{
_dbus_verbose ("Timing out authentication for connection %p\n", connection);
dbus_connection_close (connection);
}
else
{
/* We can end the loop, since the connections are in oldest-first order */
next_interval = ((double)auth_timeout) - elapsed;
_dbus_verbose ("Connection %p authentication expires in %d milliseconds\n",
connection, next_interval);
break;
}
link = next;
}
}
bus_expire_timeout_set_interval (connections->expire_timeout,
next_interval);
}
static dbus_bool_t
expire_incomplete_timeout (void *data)
{
BusConnections *connections = data;
_dbus_verbose ("Running\n");
/* note that this may remove the timeout */
bus_connections_expire_incomplete (connections);
return TRUE;
}
dbus_bool_t
bus_connection_get_unix_groups (DBusConnection *connection,
unsigned long **groups,
int *n_groups,
DBusError *error)
{
unsigned long uid;
*groups = NULL;
*n_groups = 0;
if (dbus_connection_get_unix_user (connection, &uid))
{
if (!_dbus_unix_groups_from_uid (uid, groups, n_groups))
{
_dbus_verbose ("Did not get any groups for UID %lu\n",
uid);
return FALSE;
}
else
{
_dbus_verbose ("Got %d groups for UID %lu\n",
*n_groups, uid);
return TRUE;
}
}
else
return TRUE; /* successfully got 0 groups */
}
dbus_bool_t
bus_connection_is_in_unix_group (DBusConnection *connection,
unsigned long gid)
{
int i;
unsigned long *group_ids;
int n_group_ids;
if (!bus_connection_get_unix_groups (connection, &group_ids, &n_group_ids,
NULL))
return FALSE;
i = 0;
while (i < n_group_ids)
{
if (group_ids[i] == gid)
{
dbus_free (group_ids);
return TRUE;
}
++i;
}
dbus_free (group_ids);
return FALSE;
}
const char *
bus_connection_get_loginfo (DBusConnection *connection)
{
BusConnectionData *d;
d = BUS_CONNECTION_DATA (connection);
if (!bus_connection_is_active (connection))
return "inactive";
return d->cached_loginfo_string;
}
BusClientPolicy*
bus_connection_get_policy (DBusConnection *connection)
{
BusConnectionData *d;
d = BUS_CONNECTION_DATA (connection);
_dbus_assert (d != NULL);
_dbus_assert (d->policy != NULL);
return d->policy;
}
static dbus_bool_t
foreach_active (BusConnections *connections,
BusConnectionForeachFunction function,
void *data)
{
DBusList *link;
link = _dbus_list_get_first_link (&connections->completed);
while (link != NULL)
{
DBusConnection *connection = link->data;
DBusList *next = _dbus_list_get_next_link (&connections->completed, link);
if (!(* function) (connection, data))
return FALSE;
link = next;
}
return TRUE;
}
static dbus_bool_t
foreach_inactive (BusConnections *connections,
BusConnectionForeachFunction function,
void *data)
{
DBusList *link;
link = _dbus_list_get_first_link (&connections->incomplete);
while (link != NULL)
{
DBusConnection *connection = link->data;
DBusList *next = _dbus_list_get_next_link (&connections->incomplete, link);
if (!(* function) (connection, data))
return FALSE;
link = next;
}
return TRUE;
}
/**
* Calls function on each active connection; if the function returns
* #FALSE, stops iterating. Active connections are authenticated
* and have sent a Hello message.
*
* @param connections the connections object
* @param function the function
* @param data data to pass to it as a second arg
*/
void
bus_connections_foreach_active (BusConnections *connections,
BusConnectionForeachFunction function,
void *data)
{
foreach_active (connections, function, data);
}
/**
* Calls function on each connection; if the function returns
* #FALSE, stops iterating.
*
* @param connections the connections object
* @param function the function
* @param data data to pass to it as a second arg
*/
void
bus_connections_foreach (BusConnections *connections,
BusConnectionForeachFunction function,
void *data)
{
if (!foreach_active (connections, function, data))
return;
foreach_inactive (connections, function, data);
}
BusContext*
bus_connections_get_context (BusConnections *connections)
{
return connections->context;
}
/*
* This is used to avoid covering the same connection twice when
* traversing connections. Note that it assumes we will
* bus_connection_mark_stamp() each connection at least once per
* INT_MAX increments of the global stamp, or wraparound would break
* things.
*/
void
bus_connections_increment_stamp (BusConnections *connections)
{
connections->stamp += 1;
}
/* Mark connection with current stamp, return TRUE if it
* didn't already have that stamp
*/
dbus_bool_t
bus_connection_mark_stamp (DBusConnection *connection)
{
BusConnectionData *d;
d = BUS_CONNECTION_DATA (connection);
_dbus_assert (d != NULL);
if (d->stamp == d->connections->stamp)
return FALSE;
else
{
d->stamp = d->connections->stamp;
return TRUE;
}
}
BusContext*
bus_connection_get_context (DBusConnection *connection)
{
BusConnectionData *d;
d = BUS_CONNECTION_DATA (connection);
_dbus_assert (d != NULL);
return d->connections->context;
}
BusConnections*
bus_connection_get_connections (DBusConnection *connection)
{
BusConnectionData *d;
d = BUS_CONNECTION_DATA (connection);
_dbus_assert (d != NULL);
return d->connections;
}
BusRegistry*
bus_connection_get_registry (DBusConnection *connection)
{
BusConnectionData *d;
d = BUS_CONNECTION_DATA (connection);
_dbus_assert (d != NULL);
return bus_context_get_registry (d->connections->context);
}
BusActivation*
bus_connection_get_activation (DBusConnection *connection)
{
BusConnectionData *d;
d = BUS_CONNECTION_DATA (connection);
_dbus_assert (d != NULL);
return bus_context_get_activation (d->connections->context);
}
BusMatchmaker*
bus_connection_get_matchmaker (DBusConnection *connection)
{
BusConnectionData *d;
d = BUS_CONNECTION_DATA (connection);
_dbus_assert (d != NULL);
return bus_context_get_matchmaker (d->connections->context);
}
BusSELinuxID*
bus_connection_get_selinux_id (DBusConnection *connection)
{
BusConnectionData *d;
d = BUS_CONNECTION_DATA (connection);
_dbus_assert (d != NULL);
return d->selinux_id;
}
/**
* Checks whether the connection is registered with the message bus.
*
* @param connection the connection
* @returns #TRUE if we're an active message bus participant
*/
dbus_bool_t
bus_connection_is_active (DBusConnection *connection)
{
BusConnectionData *d;
d = BUS_CONNECTION_DATA (connection);
return d != NULL && d->name != NULL;
}
dbus_bool_t
bus_connection_preallocate_oom_error (DBusConnection *connection)
{
DBusMessage *message;
DBusPreallocatedSend *preallocated;
BusConnectionData *d;
d = BUS_CONNECTION_DATA (connection);
_dbus_assert (d != NULL);
if (d->oom_preallocated != NULL)
return TRUE;
preallocated = dbus_connection_preallocate_send (connection);
if (preallocated == NULL)
return FALSE;
message = dbus_message_new (DBUS_MESSAGE_TYPE_ERROR);
if (message == NULL)
{
dbus_connection_free_preallocated_send (connection, preallocated);
return FALSE;
}
/* d->name may be NULL, but that is OK */
if (!dbus_message_set_error_name (message, DBUS_ERROR_NO_MEMORY) ||
!dbus_message_set_destination (message, d->name) ||
!dbus_message_set_sender (message,
DBUS_SERVICE_DBUS))
{
dbus_connection_free_preallocated_send (connection, preallocated);
dbus_message_unref (message);
return FALSE;
}
/* set reply serial to placeholder value just so space is already allocated
* for it.
*/
if (!dbus_message_set_reply_serial (message, 14))
{
dbus_connection_free_preallocated_send (connection, preallocated);
dbus_message_unref (message);
return FALSE;
}
d->oom_message = message;
d->oom_preallocated = preallocated;
return TRUE;
}
void
bus_connection_send_oom_error (DBusConnection *connection,
DBusMessage *in_reply_to)
{
BusConnectionData *d;
d = BUS_CONNECTION_DATA (connection);
_dbus_assert (d != NULL);
_dbus_assert (d->oom_message != NULL);
/* should always succeed since we set it to a placeholder earlier */
if (!dbus_message_set_reply_serial (d->oom_message,
dbus_message_get_serial (in_reply_to)))
_dbus_assert_not_reached ("Failed to set reply serial for preallocated oom message");
_dbus_assert (dbus_message_get_sender (d->oom_message) != NULL);
dbus_connection_send_preallocated (connection, d->oom_preallocated,
d->oom_message, NULL);
dbus_message_unref (d->oom_message);
d->oom_message = NULL;
d->oom_preallocated = NULL;
}
#ifdef DBUS_ENABLE_STATS
static void
update_peak (int *peak,
int n)
{
if (*peak < n)
*peak = n;
}
#endif
void
bus_connection_add_match_rule_link (DBusConnection *connection,
DBusList *link)
{
BusConnectionData *d;
d = BUS_CONNECTION_DATA (connection);
_dbus_assert (d != NULL);
_dbus_list_append_link (&d->match_rules, link);
d->n_match_rules += 1;
#ifdef DBUS_ENABLE_STATS
update_peak (&d->peak_match_rules, d->n_match_rules);
update_peak (&d->connections->peak_match_rules_per_conn, d->n_match_rules);
d->connections->total_match_rules += 1;
update_peak (&d->connections->peak_match_rules,
d->connections->total_match_rules);
#endif
}
dbus_bool_t
bus_connection_add_match_rule (DBusConnection *connection,
BusMatchRule *rule)
{
DBusList *link;
link = _dbus_list_alloc_link (rule);
if (link == NULL)
return FALSE;
bus_connection_add_match_rule_link (connection, link);
return TRUE;
}
void
bus_connection_remove_match_rule (DBusConnection *connection,
BusMatchRule *rule)
{
BusConnectionData *d;
d = BUS_CONNECTION_DATA (connection);
_dbus_assert (d != NULL);
_dbus_list_remove_last (&d->match_rules, rule);
d->n_match_rules -= 1;
_dbus_assert (d->n_match_rules >= 0);
#ifdef DBUS_ENABLE_STATS
d->connections->total_match_rules -= 1;
#endif
}
int
bus_connection_get_n_match_rules (DBusConnection *connection)
{
BusConnectionData *d;
d = BUS_CONNECTION_DATA (connection);
_dbus_assert (d != NULL);
return d->n_match_rules;
}
void
bus_connection_add_owned_service_link (DBusConnection *connection,
DBusList *link)
{
BusConnectionData *d;
d = BUS_CONNECTION_DATA (connection);
_dbus_assert (d != NULL);
_dbus_list_append_link (&d->services_owned, link);
d->n_services_owned += 1;
#ifdef DBUS_ENABLE_STATS
update_peak (&d->peak_bus_names, d->n_services_owned);
update_peak (&d->connections->peak_bus_names_per_conn,
d->n_services_owned);
d->connections->total_bus_names += 1;
update_peak (&d->connections->peak_bus_names,
d->connections->total_bus_names);
#endif
}
dbus_bool_t
bus_connection_add_owned_service (DBusConnection *connection,
BusService *service)
{
DBusList *link;
link = _dbus_list_alloc_link (service);
if (link == NULL)
return FALSE;
bus_connection_add_owned_service_link (connection, link);
return TRUE;
}
void
bus_connection_remove_owned_service (DBusConnection *connection,
BusService *service)
{
BusConnectionData *d;
d = BUS_CONNECTION_DATA (connection);
_dbus_assert (d != NULL);
_dbus_list_remove_last (&d->services_owned, service);
d->n_services_owned -= 1;
_dbus_assert (d->n_services_owned >= 0);
#ifdef DBUS_ENABLE_STATS
d->connections->total_bus_names -= 1;
#endif
}
int
bus_connection_get_n_services_owned (DBusConnection *connection)
{
BusConnectionData *d;
d = BUS_CONNECTION_DATA (connection);
_dbus_assert (d != NULL);
return d->n_services_owned;
}
dbus_bool_t
bus_connection_complete (DBusConnection *connection,
const DBusString *name,
DBusError *error)
{
BusConnectionData *d;
unsigned long uid;
d = BUS_CONNECTION_DATA (connection);
_dbus_assert (d != NULL);
_dbus_assert (d->name == NULL);
_dbus_assert (d->policy == NULL);
_dbus_assert (!bus_connection_is_active (connection));
if (!_dbus_string_copy_data (name, &d->name))
{
BUS_SET_OOM (error);
return FALSE;
}
_dbus_assert (d->name != NULL);
_dbus_verbose ("Name %s assigned to %p\n", d->name, connection);
d->policy = bus_context_create_client_policy (d->connections->context,
connection,
error);
/* we may have a NULL policy on OOM or error getting list of
* groups for a user. In the latter case we don't handle it so
* well currently, as it will just keep failing over and over.
*/
if (d->policy == NULL)
{
_dbus_verbose ("Failed to create security policy for connection %p\n",
connection);
_DBUS_ASSERT_ERROR_IS_SET (error);
dbus_free (d->name);
d->name = NULL;
return FALSE;
}
if (dbus_connection_get_unix_user (connection, &uid))
{
if (!adjust_connections_for_uid (d->connections,
uid, 1))
goto fail;
}
/* Create and cache a string which holds information about the
* peer process; used for logging purposes.
*/
if (!cache_peer_loginfo_string (d, connection))
goto fail;
/* Now the connection is active, move it between lists */
_dbus_list_unlink (&d->connections->incomplete,
d->link_in_connection_list);
d->connections->n_incomplete -= 1;
_dbus_list_append_link (&d->connections->completed,
d->link_in_connection_list);
d->connections->n_completed += 1;
_dbus_assert (d->connections->n_incomplete >= 0);
_dbus_assert (d->connections->n_completed > 0);
/* See if we can remove the timeout */
bus_connections_expire_incomplete (d->connections);
_dbus_assert (bus_connection_is_active (connection));
return TRUE;
fail:
BUS_SET_OOM (error);
dbus_free (d->name);
d->name = NULL;
if (d->policy)
bus_client_policy_unref (d->policy);
d->policy = NULL;
return FALSE;
}
const char *
bus_connection_get_name (DBusConnection *connection)
{
BusConnectionData *d;
d = BUS_CONNECTION_DATA (connection);
_dbus_assert (d != NULL);
return d->name;
}
/**
* Check whether completing the passed-in connection would
* exceed limits, and if so set error and return #FALSE
*/
dbus_bool_t
bus_connections_check_limits (BusConnections *connections,
DBusConnection *requesting_completion,
DBusError *error)
{
unsigned long uid;
if (connections->n_completed >=
bus_context_get_max_completed_connections (connections->context))
{
dbus_set_error (error, DBUS_ERROR_LIMITS_EXCEEDED,
"The maximum number of active connections has been reached");
return FALSE;
}
if (dbus_connection_get_unix_user (requesting_completion, &uid))
{
if (get_connections_for_uid (connections, uid) >=
bus_context_get_max_connections_per_user (connections->context))
{
dbus_set_error (error, DBUS_ERROR_LIMITS_EXCEEDED,
"The maximum number of active connections for UID %lu has been reached",
uid);
return FALSE;
}
}
return TRUE;
}
static void
bus_pending_reply_free (BusPendingReply *pending)
{
_dbus_verbose ("Freeing pending reply %p, replier %p receiver %p serial %u\n",
pending,
pending->will_send_reply,
pending->will_get_reply,
pending->reply_serial);
dbus_free (pending);
}
static dbus_bool_t
bus_pending_reply_send_no_reply (BusConnections *connections,
BusTransaction *transaction,
BusPendingReply *pending)
{
DBusMessage *message;
DBusMessageIter iter;
dbus_bool_t retval;
const char *errmsg;
retval = FALSE;
message = dbus_message_new (DBUS_MESSAGE_TYPE_ERROR);
if (message == NULL)
return FALSE;
dbus_message_set_no_reply (message, TRUE);
if (!dbus_message_set_reply_serial (message,
pending->reply_serial))
goto out;
if (!dbus_message_set_error_name (message,
DBUS_ERROR_NO_REPLY))
goto out;
errmsg = "Message did not receive a reply (timeout by message bus)";
dbus_message_iter_init_append (message, &iter);
if (!dbus_message_iter_append_basic (&iter, DBUS_TYPE_STRING, &errmsg))
goto out;
if (!bus_transaction_send_from_driver (transaction, pending->will_get_reply,
message))
goto out;
retval = TRUE;
out:
dbus_message_unref (message);
return retval;
}
static dbus_bool_t
bus_pending_reply_expired (BusExpireList *list,
DBusList *link,
void *data)
{
BusPendingReply *pending = link->data;
BusConnections *connections = data;
BusTransaction *transaction;
/* No reply is forthcoming. So nuke it if we can. If not,
* leave it in the list to try expiring again later when we
* get more memory.
*/
_dbus_verbose ("Expiring pending reply %p, replier %p receiver %p serial %u\n",
pending,
pending->will_send_reply,
pending->will_get_reply,
pending->reply_serial);
transaction = bus_transaction_new (connections->context);
if (transaction == NULL)
return FALSE;
if (!bus_pending_reply_send_no_reply (connections,
transaction,
pending))
{
bus_transaction_cancel_and_free (transaction);
return FALSE;
}
bus_expire_list_remove_link (connections->pending_replies, link);
bus_pending_reply_free (pending);
bus_transaction_execute_and_free (transaction);
return TRUE;
}
static void
bus_connection_drop_pending_replies (BusConnections *connections,
DBusConnection *connection)
{
/* The DBusConnection is almost 100% finalized here, so you can't
* do anything with it except check for pointer equality
*/
DBusList *link;
_dbus_verbose ("Dropping pending replies that involve connection %p\n",
connection);
link = bus_expire_list_get_first_link (connections->pending_replies);
while (link != NULL)
{
DBusList *next;
BusPendingReply *pending;
next = bus_expire_list_get_next_link (connections->pending_replies,
link);
pending = link->data;
if (pending->will_get_reply == connection)
{
/* We don't need to track this pending reply anymore */
_dbus_verbose ("Dropping pending reply %p, replier %p receiver %p serial %u\n",
pending,
pending->will_send_reply,
pending->will_get_reply,
pending->reply_serial);
bus_expire_list_remove_link (connections->pending_replies,
link);
bus_pending_reply_free (pending);
}
else if (pending->will_send_reply == connection)
{
/* The reply isn't going to be sent, so set things
* up so it will be expired right away
*/
_dbus_verbose ("Will expire pending reply %p, replier %p receiver %p serial %u\n",
pending,
pending->will_send_reply,
pending->will_get_reply,
pending->reply_serial);
pending->will_send_reply = NULL;
pending->expire_item.added_tv_sec = 0;
pending->expire_item.added_tv_usec = 0;
bus_expire_list_recheck_immediately (connections->pending_replies);
}
link = next;
}
}
typedef struct
{
BusPendingReply *pending;
BusConnections *connections;
} CancelPendingReplyData;
static void
cancel_pending_reply (void *data)
{
CancelPendingReplyData *d = data;
_dbus_verbose ("d = %p\n", d);
if (!bus_expire_list_remove (d->connections->pending_replies,
&d->pending->expire_item))
_dbus_assert_not_reached ("pending reply did not exist to be cancelled");
bus_pending_reply_free (d->pending); /* since it's been cancelled */
}
static void
cancel_pending_reply_data_free (void *data)
{
CancelPendingReplyData *d = data;
_dbus_verbose ("d = %p\n", d);
/* d->pending should be either freed or still
* in the list of pending replies (owned by someone
* else)
*/
dbus_free (d);
}
/*
* Record that a reply is allowed; return TRUE on success.
*/
dbus_bool_t
bus_connections_expect_reply (BusConnections *connections,
BusTransaction *transaction,
DBusConnection *will_get_reply,
DBusConnection *will_send_reply,
DBusMessage *reply_to_this,
DBusError *error)
{
BusPendingReply *pending;
dbus_uint32_t reply_serial;
DBusList *link;
CancelPendingReplyData *cprd;
int count;
_dbus_assert (will_get_reply != NULL);
_dbus_assert (will_send_reply != NULL);
_dbus_assert (reply_to_this != NULL);
if (dbus_message_get_no_reply (reply_to_this))
return TRUE; /* we won't allow a reply, since client doesn't care for one. */
reply_serial = dbus_message_get_serial (reply_to_this);
link = bus_expire_list_get_first_link (connections->pending_replies);
count = 0;
while (link != NULL)
{
pending = link->data;
if (pending->reply_serial == reply_serial &&
pending->will_get_reply == will_get_reply &&
pending->will_send_reply == will_send_reply)
{
dbus_set_error (error, DBUS_ERROR_ACCESS_DENIED,
"Message has the same reply serial as a currently-outstanding existing method call");
return FALSE;
}
link = bus_expire_list_get_next_link (connections->pending_replies,
link);
if (pending->will_get_reply == will_get_reply)
++count;
}
if (count >=
bus_context_get_max_replies_per_connection (connections->context))
{
dbus_set_error (error, DBUS_ERROR_LIMITS_EXCEEDED,
"The maximum number of pending replies per connection has been reached");
return FALSE;
}
pending = dbus_new0 (BusPendingReply, 1);
if (pending == NULL)
{
BUS_SET_OOM (error);
return FALSE;
}
#ifdef DBUS_ENABLE_VERBOSE_MODE
/* so we can see a not-yet-added pending reply */
pending->expire_item.added_tv_sec = 1;
pending->expire_item.added_tv_usec = 1;
#endif
pending->will_get_reply = will_get_reply;
pending->will_send_reply = will_send_reply;
pending->reply_serial = reply_serial;
cprd = dbus_new0 (CancelPendingReplyData, 1);
if (cprd == NULL)
{
BUS_SET_OOM (error);
bus_pending_reply_free (pending);
return FALSE;
}
if (!bus_expire_list_add (connections->pending_replies,
&pending->expire_item))
{
BUS_SET_OOM (error);
dbus_free (cprd);
bus_pending_reply_free (pending);
return FALSE;
}
if (!bus_transaction_add_cancel_hook (transaction,
cancel_pending_reply,
cprd,
cancel_pending_reply_data_free))
{
BUS_SET_OOM (error);
bus_expire_list_remove (connections->pending_replies, &pending->expire_item);
dbus_free (cprd);
bus_pending_reply_free (pending);
return FALSE;
}
cprd->pending = pending;
cprd->connections = connections;
_dbus_get_monotonic_time (&pending->expire_item.added_tv_sec,
&pending->expire_item.added_tv_usec);
_dbus_verbose ("Added pending reply %p, replier %p receiver %p serial %u\n",
pending,
pending->will_send_reply,
pending->will_get_reply,
pending->reply_serial);
return TRUE;
}
typedef struct
{
DBusList *link;
BusConnections *connections;
} CheckPendingReplyData;
static void
cancel_check_pending_reply (void *data)
{
CheckPendingReplyData *d = data;
_dbus_verbose ("d = %p\n",d);
bus_expire_list_add_link (d->connections->pending_replies,
d->link);
d->link = NULL;
}
static void
check_pending_reply_data_free (void *data)
{
CheckPendingReplyData *d = data;
_dbus_verbose ("d = %p\n",d);
if (d->link != NULL)
{
BusPendingReply *pending = d->link->data;
_dbus_assert (!bus_expire_list_contains_item (d->connections->pending_replies,
&pending->expire_item));
bus_pending_reply_free (pending);
_dbus_list_free_link (d->link);
}
dbus_free (d);
}
/*
* Check whether a reply is allowed, remove BusPendingReply
* if so, return TRUE if so.
*/
dbus_bool_t
bus_connections_check_reply (BusConnections *connections,
BusTransaction *transaction,
DBusConnection *sending_reply,
DBusConnection *receiving_reply,
DBusMessage *reply,
DBusError *error)
{
CheckPendingReplyData *cprd;
DBusList *link;
dbus_uint32_t reply_serial;
_dbus_assert (sending_reply != NULL);
_dbus_assert (receiving_reply != NULL);
reply_serial = dbus_message_get_reply_serial (reply);
link = bus_expire_list_get_first_link (connections->pending_replies);
while (link != NULL)
{
BusPendingReply *pending = link->data;
if (pending->reply_serial == reply_serial &&
pending->will_get_reply == receiving_reply &&
pending->will_send_reply == sending_reply)
{
_dbus_verbose ("Found pending reply with serial %u\n", reply_serial);
break;
}
link = bus_expire_list_get_next_link (connections->pending_replies,
link);
}
if (link == NULL)
{
_dbus_verbose ("No pending reply expected\n");
return FALSE;
}
cprd = dbus_new0 (CheckPendingReplyData, 1);
if (cprd == NULL)
{
BUS_SET_OOM (error);
return FALSE;
}
if (!bus_transaction_add_cancel_hook (transaction,
cancel_check_pending_reply,
cprd,
check_pending_reply_data_free))
{
BUS_SET_OOM (error);
dbus_free (cprd);
return FALSE;
}
cprd->link = link;
cprd->connections = connections;
bus_expire_list_unlink (connections->pending_replies,
link);
_dbus_assert (!bus_expire_list_contains_item (connections->pending_replies, link->data));
return TRUE;
}
/*
* Transactions
*
* Note that this is fairly fragile; in particular, don't try to use
* one transaction across any main loop iterations.
*/
typedef struct
{
BusTransaction *transaction;
DBusMessage *message;
DBusPreallocatedSend *preallocated;
} MessageToSend;
typedef struct
{
BusTransactionCancelFunction cancel_function;
DBusFreeFunction free_data_function;
void *data;
} CancelHook;
struct BusTransaction
{
DBusList *connections;
BusContext *context;
DBusList *cancel_hooks;
};
static void
message_to_send_free (DBusConnection *connection,
MessageToSend *to_send)
{
if (to_send->message)
dbus_message_unref (to_send->message);
if (to_send->preallocated)
dbus_connection_free_preallocated_send (connection, to_send->preallocated);
dbus_free (to_send);
}
static void
cancel_hook_cancel (void *element,
void *data)
{
CancelHook *ch = element;
_dbus_verbose ("Running transaction cancel hook\n");
if (ch->cancel_function)
(* ch->cancel_function) (ch->data);
}
static void
cancel_hook_free (void *element,
void *data)
{
CancelHook *ch = element;
if (ch->free_data_function)
(* ch->free_data_function) (ch->data);
dbus_free (ch);
}
static void
free_cancel_hooks (BusTransaction *transaction)
{
_dbus_list_foreach (&transaction->cancel_hooks,
cancel_hook_free, NULL);
_dbus_list_clear (&transaction->cancel_hooks);
}
BusTransaction*
bus_transaction_new (BusContext *context)
{
BusTransaction *transaction;
transaction = dbus_new0 (BusTransaction, 1);
if (transaction == NULL)
return NULL;
transaction->context = context;
return transaction;
}
BusContext*
bus_transaction_get_context (BusTransaction *transaction)
{
return transaction->context;
}
BusConnections*
bus_transaction_get_connections (BusTransaction *transaction)
{
return bus_context_get_connections (transaction->context);
}
dbus_bool_t
bus_transaction_send_from_driver (BusTransaction *transaction,
DBusConnection *connection,
DBusMessage *message)
{
/* We have to set the sender to the driver, and have
* to check security policy since it was not done in
* dispatch.c
*/
_dbus_verbose ("Sending %s %s %s from driver\n",
dbus_message_get_interface (message) ?
dbus_message_get_interface (message) : "(no interface)",
dbus_message_get_member (message) ?
dbus_message_get_member (message) : "(no member)",
dbus_message_get_error_name (message) ?
dbus_message_get_error_name (message) : "(no error name)");
if (!dbus_message_set_sender (message, DBUS_SERVICE_DBUS))
return FALSE;
if (bus_connection_is_active (connection))
{
if (!dbus_message_set_destination (message,
bus_connection_get_name (connection)))
return FALSE;
}
/* bus driver never wants a reply */
dbus_message_set_no_reply (message, TRUE);
/* If security policy doesn't allow the message, we silently
* eat it; the driver doesn't care about getting a reply.
*/
if (!bus_context_check_security_policy (bus_transaction_get_context (transaction),
transaction,
NULL, connection, connection, message, NULL))
return TRUE;
return bus_transaction_send (transaction, connection, message);
}
dbus_bool_t
bus_transaction_send (BusTransaction *transaction,
DBusConnection *connection,
DBusMessage *message)
{
MessageToSend *to_send;
BusConnectionData *d;
DBusList *link;
_dbus_verbose (" trying to add %s interface=%s member=%s error=%s to transaction%s\n",
dbus_message_get_type (message) == DBUS_MESSAGE_TYPE_ERROR ? "error" :
dbus_message_get_reply_serial (message) != 0 ? "reply" :
"message",
dbus_message_get_interface (message) ?
dbus_message_get_interface (message) : "(unset)",
dbus_message_get_member (message) ?
dbus_message_get_member (message) : "(unset)",
dbus_message_get_error_name (message) ?
dbus_message_get_error_name (message) : "(unset)",
dbus_connection_get_is_connected (connection) ?
"" : " (disconnected)");
_dbus_assert (dbus_message_get_sender (message) != NULL);
if (!dbus_connection_get_is_connected (connection))
return TRUE; /* silently ignore disconnected connections */
d = BUS_CONNECTION_DATA (connection);
_dbus_assert (d != NULL);
to_send = dbus_new (MessageToSend, 1);
if (to_send == NULL)
{
return FALSE;
}
to_send->preallocated = dbus_connection_preallocate_send (connection);
if (to_send->preallocated == NULL)
{
dbus_free (to_send);
return FALSE;
}
dbus_message_ref (message);
to_send->message = message;
to_send->transaction = transaction;
_dbus_verbose ("about to prepend message\n");
if (!_dbus_list_prepend (&d->transaction_messages, to_send))
{
message_to_send_free (connection, to_send);
return FALSE;
}
_dbus_verbose ("prepended message\n");
/* See if we already had this connection in the list
* for this transaction. If we have a pending message,
* then we should already be in transaction->connections
*/
link = _dbus_list_get_first_link (&d->transaction_messages);
_dbus_assert (link->data == to_send);
link = _dbus_list_get_next_link (&d->transaction_messages, link);
while (link != NULL)
{
MessageToSend *m = link->data;
DBusList *next = _dbus_list_get_next_link (&d->transaction_messages, link);
if (m->transaction == transaction)
break;
link = next;
}
if (link == NULL)
{
if (!_dbus_list_prepend (&transaction->connections, connection))
{
_dbus_list_remove (&d->transaction_messages, to_send);
message_to_send_free (connection, to_send);
return FALSE;
}
}
return TRUE;
}
static void
connection_cancel_transaction (DBusConnection *connection,
BusTransaction *transaction)
{
DBusList *link;
BusConnectionData *d;
d = BUS_CONNECTION_DATA (connection);
_dbus_assert (d != NULL);
link = _dbus_list_get_first_link (&d->transaction_messages);
while (link != NULL)
{
MessageToSend *m = link->data;
DBusList *next = _dbus_list_get_next_link (&d->transaction_messages, link);
if (m->transaction == transaction)
{
_dbus_list_remove_link (&d->transaction_messages,
link);
message_to_send_free (connection, m);
}
link = next;
}
}
void
bus_transaction_cancel_and_free (BusTransaction *transaction)
{
DBusConnection *connection;
_dbus_verbose ("TRANSACTION: cancelled\n");
while ((connection = _dbus_list_pop_first (&transaction->connections)))
connection_cancel_transaction (connection, transaction);
_dbus_assert (transaction->connections == NULL);
_dbus_list_foreach (&transaction->cancel_hooks,
cancel_hook_cancel, NULL);
free_cancel_hooks (transaction);
dbus_free (transaction);
}
static void
connection_execute_transaction (DBusConnection *connection,
BusTransaction *transaction)
{
DBusList *link;
BusConnectionData *d;
d = BUS_CONNECTION_DATA (connection);
_dbus_assert (d != NULL);
/* Send the queue in order (FIFO) */
link = _dbus_list_get_last_link (&d->transaction_messages);
while (link != NULL)
{
MessageToSend *m = link->data;
DBusList *prev = _dbus_list_get_prev_link (&d->transaction_messages, link);
if (m->transaction == transaction)
{
_dbus_list_remove_link (&d->transaction_messages,
link);
_dbus_assert (dbus_message_get_sender (m->message) != NULL);
dbus_connection_send_preallocated (connection,
m->preallocated,
m->message,
NULL);
m->preallocated = NULL; /* so we don't double-free it */
message_to_send_free (connection, m);
}
link = prev;
}
}
void
bus_transaction_execute_and_free (BusTransaction *transaction)
{
/* For each connection in transaction->connections
* send the messages
*/
DBusConnection *connection;
_dbus_verbose ("TRANSACTION: executing\n");
while ((connection = _dbus_list_pop_first (&transaction->connections)))
connection_execute_transaction (connection, transaction);
_dbus_assert (transaction->connections == NULL);
free_cancel_hooks (transaction);
dbus_free (transaction);
}
static void
bus_connection_remove_transactions (DBusConnection *connection)
{
MessageToSend *to_send;
BusConnectionData *d;
d = BUS_CONNECTION_DATA (connection);
_dbus_assert (d != NULL);
while ((to_send = _dbus_list_get_first (&d->transaction_messages)))
{
/* only has an effect for the first MessageToSend listing this transaction */
_dbus_list_remove (&to_send->transaction->connections,
connection);
_dbus_list_remove (&d->transaction_messages, to_send);
message_to_send_free (connection, to_send);
}
}
/**
* Converts the DBusError to a message reply
*/
dbus_bool_t
bus_transaction_send_error_reply (BusTransaction *transaction,
DBusConnection *connection,
const DBusError *error,
DBusMessage *in_reply_to)
{
DBusMessage *reply;
_dbus_assert (error != NULL);
_DBUS_ASSERT_ERROR_IS_SET (error);
_dbus_verbose ("Sending error reply %s \"%s\"\n",
error->name, error->message);
reply = dbus_message_new_error (in_reply_to,
error->name,
error->message);
if (reply == NULL)
return FALSE;
if (!bus_transaction_send_from_driver (transaction, connection, reply))
{
dbus_message_unref (reply);
return FALSE;
}
dbus_message_unref (reply);
return TRUE;
}
dbus_bool_t
bus_transaction_add_cancel_hook (BusTransaction *transaction,
BusTransactionCancelFunction cancel_function,
void *data,
DBusFreeFunction free_data_function)
{
CancelHook *ch;
ch = dbus_new (CancelHook, 1);
if (ch == NULL)
return FALSE;
_dbus_verbose (" adding cancel hook function = %p data = %p\n",
cancel_function, data);
ch->cancel_function = cancel_function;
ch->data = data;
ch->free_data_function = free_data_function;
/* It's important that the hooks get run in reverse order that they
* were added
*/
if (!_dbus_list_prepend (&transaction->cancel_hooks, ch))
{
dbus_free (ch);
return FALSE;
}
return TRUE;
}
#ifdef DBUS_ENABLE_STATS
int
bus_connections_get_n_active (BusConnections *connections)
{
return connections->n_completed;
}
int
bus_connections_get_n_incomplete (BusConnections *connections)
{
return connections->n_incomplete;
}
int
bus_connections_get_total_match_rules (BusConnections *connections)
{
return connections->total_match_rules;
}
int
bus_connections_get_peak_match_rules (BusConnections *connections)
{
return connections->peak_match_rules;
}
int
bus_connections_get_peak_match_rules_per_conn (BusConnections *connections)
{
return connections->peak_match_rules_per_conn;
}
int
bus_connections_get_total_bus_names (BusConnections *connections)
{
return connections->total_bus_names;
}
int
bus_connections_get_peak_bus_names (BusConnections *connections)
{
return connections->peak_bus_names;
}
int
bus_connections_get_peak_bus_names_per_conn (BusConnections *connections)
{
return connections->peak_bus_names_per_conn;
}
int
bus_connection_get_peak_match_rules (DBusConnection *connection)
{
BusConnectionData *d;
d = BUS_CONNECTION_DATA (connection);
return d->peak_match_rules;
}
int
bus_connection_get_peak_bus_names (DBusConnection *connection)
{
BusConnectionData *d;
d = BUS_CONNECTION_DATA (connection);
return d->peak_bus_names;
}
#endif /* DBUS_ENABLE_STATS */