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glib2.0/gio/gdbusdaemon.c

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/*
* Copyright © 2012 Red Hat, Inc.
*
* SPDX-License-Identifier: LGPL-2.1-or-later
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General
* Public License along with this library; if not, see <http://www.gnu.org/licenses/>.
*
* Authors: Alexander Larsson <alexl@redhat.com>
*/
#include "config.h"
#include <string.h>
#include <stdlib.h>
#include <gstdio.h>
#include <gio/gio.h>
#include <gio/gunixsocketaddress.h>
#include "gdbusdaemon.h"
#include "glibintl.h"
#include "gdbus-daemon-generated.h"
#define DBUS_SERVICE_NAME "org.freedesktop.DBus"
/* Owner flags */
#define DBUS_NAME_FLAG_ALLOW_REPLACEMENT 0x1 /**< Allow another service to become the primary owner if requested */
#define DBUS_NAME_FLAG_REPLACE_EXISTING 0x2 /**< Request to replace the current primary owner */
#define DBUS_NAME_FLAG_DO_NOT_QUEUE 0x4 /**< If we can not become the primary owner do not place us in the queue */
/* Replies to request for a name */
#define DBUS_REQUEST_NAME_REPLY_PRIMARY_OWNER 1 /**< Service has become the primary owner of the requested name */
#define DBUS_REQUEST_NAME_REPLY_IN_QUEUE 2 /**< Service could not become the primary owner and has been placed in the queue */
#define DBUS_REQUEST_NAME_REPLY_EXISTS 3 /**< Service is already in the queue */
#define DBUS_REQUEST_NAME_REPLY_ALREADY_OWNER 4 /**< Service is already the primary owner */
/* Replies to releasing a name */
#define DBUS_RELEASE_NAME_REPLY_RELEASED 1 /**< Service was released from the given name */
#define DBUS_RELEASE_NAME_REPLY_NON_EXISTENT 2 /**< The given name does not exist on the bus */
#define DBUS_RELEASE_NAME_REPLY_NOT_OWNER 3 /**< Service is not an owner of the given name */
/* Replies to service starts */
#define DBUS_START_REPLY_SUCCESS 1 /**< Service was auto started */
#define DBUS_START_REPLY_ALREADY_RUNNING 2 /**< Service was already running */
#define IDLE_TIMEOUT_MSEC 3000
struct _GDBusDaemon
{
_GFreedesktopDBusSkeleton parent_instance;
gchar *address;
guint timeout;
gchar *tmpdir;
GDBusServer *server;
gchar *guid;
GHashTable *clients;
GHashTable *names;
guint32 next_major_id;
guint32 next_minor_id;
};
struct _GDBusDaemonClass
{
_GFreedesktopDBusSkeletonClass parent_class;
};
enum {
PROP_0,
PROP_ADDRESS,
};
enum
{
SIGNAL_IDLE_TIMEOUT,
NR_SIGNALS
};
static guint g_dbus_daemon_signals[NR_SIGNALS];
static void initable_iface_init (GInitableIface *initable_iface);
static void g_dbus_daemon_iface_init (_GFreedesktopDBusIface *iface);
#define g_dbus_daemon_get_type _g_dbus_daemon_get_type
G_DEFINE_TYPE_WITH_CODE (GDBusDaemon, g_dbus_daemon, _G_TYPE_FREEDESKTOP_DBUS_SKELETON,
G_IMPLEMENT_INTERFACE (G_TYPE_INITABLE, initable_iface_init)
G_IMPLEMENT_INTERFACE (_G_TYPE_FREEDESKTOP_DBUS, g_dbus_daemon_iface_init))
typedef struct {
GDBusDaemon *daemon;
char *id;
GDBusConnection *connection;
GList *matches;
} Client;
typedef struct {
Client *client;
guint32 flags;
} NameOwner;
typedef struct {
int refcount;
char *name;
GDBusDaemon *daemon;
NameOwner *owner;
GList *queue;
} Name;
enum {
MATCH_ELEMENT_TYPE,
MATCH_ELEMENT_SENDER,
MATCH_ELEMENT_INTERFACE,
MATCH_ELEMENT_MEMBER,
MATCH_ELEMENT_PATH,
MATCH_ELEMENT_PATH_NAMESPACE,
MATCH_ELEMENT_DESTINATION,
MATCH_ELEMENT_ARG0NAMESPACE,
MATCH_ELEMENT_EAVESDROP,
MATCH_ELEMENT_ARGN,
MATCH_ELEMENT_ARGNPATH,
};
typedef struct {
guint16 type;
guint16 arg;
char *value;
} MatchElement;
typedef struct {
gboolean eavesdrop;
GDBusMessageType type;
int n_elements;
MatchElement *elements;
} Match;
static GDBusMessage *filter_function (GDBusConnection *connection,
GDBusMessage *message,
gboolean incoming,
gpointer user_data);
static void connection_closed (GDBusConnection *connection,
gboolean remote_peer_vanished,
GError *error,
Client *client);
static NameOwner *
name_owner_new (Client *client, guint32 flags)
{
NameOwner *owner;
owner = g_new0 (NameOwner, 1);
owner->client = client;
owner->flags = flags;
return owner;
}
static void
name_owner_free (NameOwner *owner)
{
g_free (owner);
}
static Name *
name_new (GDBusDaemon *daemon, const char *str)
{
Name *name;
name = g_new0 (Name, 1);
name->refcount = 1;
name->daemon = daemon;
name->name = g_strdup (str);
g_hash_table_insert (daemon->names, name->name, name);
return name;
}
static Name *
name_ref (Name *name)
{
g_assert (name->refcount > 0);
name->refcount++;
return name;
}
static void
name_unref (Name *name)
{
g_assert (name->refcount > 0);
if (--name->refcount == 0)
{
g_hash_table_remove (name->daemon->names, name->name);
g_free (name->name);
g_free (name);
}
}
static Name *
name_ensure (GDBusDaemon *daemon, const char *str)
{
Name *name;
name = g_hash_table_lookup (daemon->names, str);
if (name != NULL)
return name_ref (name);
return name_new (daemon, str);
}
static Name *
name_lookup (GDBusDaemon *daemon, const char *str)
{
return g_hash_table_lookup (daemon->names, str);
}
static gboolean
is_key (const char *key_start, const char *key_end, const char *value)
{
gsize len = strlen (value);
g_assert (key_end >= key_start);
if (len != (gsize) (key_end - key_start))
return FALSE;
return strncmp (key_start, value, len) == 0;
}
static gboolean
parse_key (MatchElement *element, const char *key_start, const char *key_end)
{
gboolean res = TRUE;
if (is_key (key_start, key_end, "type"))
{
element->type = MATCH_ELEMENT_TYPE;
}
else if (is_key (key_start, key_end, "sender"))
{
element->type = MATCH_ELEMENT_SENDER;
}
else if (is_key (key_start, key_end, "interface"))
{
element->type = MATCH_ELEMENT_INTERFACE;
}
else if (is_key (key_start, key_end, "member"))
{
element->type = MATCH_ELEMENT_MEMBER;
}
else if (is_key (key_start, key_end, "path"))
{
element->type = MATCH_ELEMENT_PATH;
}
else if (is_key (key_start, key_end, "path_namespace"))
{
element->type = MATCH_ELEMENT_PATH_NAMESPACE;
}
else if (is_key (key_start, key_end, "destination"))
{
element->type = MATCH_ELEMENT_DESTINATION;
}
else if (is_key (key_start, key_end, "arg0namespace"))
{
element->type = MATCH_ELEMENT_ARG0NAMESPACE;
}
else if (is_key (key_start, key_end, "eavesdrop"))
{
element->type = MATCH_ELEMENT_EAVESDROP;
}
else if (key_end - key_start > 3 && is_key (key_start, key_start + 3, "arg"))
{
const char *digits = key_start + 3;
const char *end_digits = digits;
while (end_digits < key_end && g_ascii_isdigit (*end_digits))
end_digits++;
if (end_digits == key_end) /* argN */
{
element->type = MATCH_ELEMENT_ARGN;
element->arg = atoi (digits);
}
else if (is_key (end_digits, key_end, "path")) /* argNpath */
{
element->type = MATCH_ELEMENT_ARGNPATH;
element->arg = atoi (digits);
}
else
res = FALSE;
}
else
res = FALSE;
return res;
}
static const char *
parse_value (MatchElement *element, const char *s)
{
char quote_char;
GString *value;
value = g_string_new ("");
quote_char = 0;
for (;*s; s++)
{
if (quote_char == 0)
{
switch (*s)
{
case '\'':
quote_char = '\'';
break;
case ',':
s++;
goto out;
case '\\':
quote_char = '\\';
break;
default:
g_string_append_c (value, *s);
break;
}
}
else if (quote_char == '\\')
{
/* \ only counts as an escape if escaping a quote mark */
if (*s != '\'')
g_string_append_c (value, '\\');
g_string_append_c (value, *s);
quote_char = 0;
}
else /* quote_char == ' */
{
if (*s == '\'')
quote_char = 0;
else
g_string_append_c (value, *s);
}
}
out:
if (quote_char == '\\')
g_string_append_c (value, '\\');
else if (quote_char == '\'')
{
g_string_free (value, TRUE);
return NULL;
}
element->value = g_string_free (value, FALSE);
return s;
}
static Match *
match_new (const char *str)
{
Match *match;
GArray *elements;
const char *p;
const char *key_start;
const char *key_end;
MatchElement element;
gboolean eavesdrop;
GDBusMessageType type;
gsize i;
eavesdrop = FALSE;
type = G_DBUS_MESSAGE_TYPE_INVALID;
elements = g_array_new (TRUE, TRUE, sizeof (MatchElement));
p = str;
while (*p != 0)
{
memset (&element, 0, sizeof (element));
/* Skip initial whitespace */
while (*p && g_ascii_isspace (*p))
p++;
key_start = p;
/* Read non-whitespace non-equals chars */
while (*p && *p != '=' && !g_ascii_isspace (*p))
p++;
key_end = p;
/* Skip any whitespace after key */
while (*p && g_ascii_isspace (*p))
p++;
if (key_start == key_end)
continue; /* Allow trailing whitespace */
if (*p != '=')
goto error;
++p;
if (!parse_key (&element, key_start, key_end))
goto error;
p = parse_value (&element, p);
if (p == NULL)
goto error;
if (element.type == MATCH_ELEMENT_EAVESDROP)
{
if (strcmp (element.value, "true") == 0)
eavesdrop = TRUE;
else if (strcmp (element.value, "false") == 0)
eavesdrop = FALSE;
else
{
g_free (element.value);
goto error;
}
g_free (element.value);
}
else if (element.type == MATCH_ELEMENT_TYPE)
{
if (strcmp (element.value, "signal") == 0)
type = G_DBUS_MESSAGE_TYPE_SIGNAL;
else if (strcmp (element.value, "method_call") == 0)
type = G_DBUS_MESSAGE_TYPE_METHOD_CALL;
else if (strcmp (element.value, "method_return") == 0)
type = G_DBUS_MESSAGE_TYPE_METHOD_RETURN;
else if (strcmp (element.value, "error") == 0)
type = G_DBUS_MESSAGE_TYPE_ERROR;
else
{
g_free (element.value);
goto error;
}
g_free (element.value);
}
else
g_array_append_val (elements, element);
}
match = g_new0 (Match, 1);
match->n_elements = elements->len;
match->elements = (MatchElement *)g_array_free (elements, FALSE);
match->eavesdrop = eavesdrop;
match->type = type;
return match;
error:
for (i = 0; i < elements->len; i++)
g_free (g_array_index (elements, MatchElement, i).value);
g_array_free (elements, TRUE);
return NULL;
}
static void
match_free (Match *match)
{
int i;
for (i = 0; i < match->n_elements; i++)
g_free (match->elements[i].value);
g_free (match->elements);
g_free (match);
}
static gboolean
match_equal (Match *a, Match *b)
{
int i;
if (a->eavesdrop != b->eavesdrop)
return FALSE;
if (a->type != b->type)
return FALSE;
if (a->n_elements != b->n_elements)
return FALSE;
for (i = 0; i < a->n_elements; i++)
{
if (a->elements[i].type != b->elements[i].type ||
a->elements[i].arg != b->elements[i].arg ||
strcmp (a->elements[i].value, b->elements[i].value) != 0)
return FALSE;
}
return TRUE;
}
static const gchar *
message_get_argN (GDBusMessage *message, int n, gboolean allow_path)
{
const gchar *ret;
GVariant *body;
ret = NULL;
body = g_dbus_message_get_body (message);
if (body != NULL && g_variant_is_of_type (body, G_VARIANT_TYPE_TUPLE))
{
GVariant *item;
item = g_variant_get_child_value (body, n);
if (g_variant_is_of_type (item, G_VARIANT_TYPE_STRING) ||
(allow_path && g_variant_is_of_type (item, G_VARIANT_TYPE_OBJECT_PATH)))
ret = g_variant_get_string (item, NULL);
g_variant_unref (item);
}
return ret;
}
enum {
CHECK_TYPE_STRING,
CHECK_TYPE_NAME,
CHECK_TYPE_PATH_PREFIX,
CHECK_TYPE_PATH_RELATED,
CHECK_TYPE_NAMESPACE_PREFIX
};
static gboolean
match_matches (GDBusDaemon *daemon,
Match *match, GDBusMessage *message,
gboolean has_destination)
{
MatchElement *element;
Name *name;
int i, len, len2;
const char *value;
int check_type;
if (has_destination && !match->eavesdrop)
return FALSE;
if (match->type != G_DBUS_MESSAGE_TYPE_INVALID &&
g_dbus_message_get_message_type (message) != match->type)
return FALSE;
for (i = 0; i < match->n_elements; i++)
{
element = &match->elements[i];
check_type = CHECK_TYPE_STRING;
switch (element->type)
{
case MATCH_ELEMENT_SENDER:
check_type = CHECK_TYPE_NAME;
value = g_dbus_message_get_sender (message);
if (value == NULL)
value = DBUS_SERVICE_NAME;
break;
case MATCH_ELEMENT_DESTINATION:
check_type = CHECK_TYPE_NAME;
value = g_dbus_message_get_destination (message);
break;
case MATCH_ELEMENT_INTERFACE:
value = g_dbus_message_get_interface (message);
break;
case MATCH_ELEMENT_MEMBER:
value = g_dbus_message_get_member (message);
break;
case MATCH_ELEMENT_PATH:
value = g_dbus_message_get_path (message);
break;
case MATCH_ELEMENT_PATH_NAMESPACE:
check_type = CHECK_TYPE_PATH_PREFIX;
value = g_dbus_message_get_path (message);
break;
case MATCH_ELEMENT_ARG0NAMESPACE:
check_type = CHECK_TYPE_NAMESPACE_PREFIX;
value = message_get_argN (message, 0, FALSE);
break;
case MATCH_ELEMENT_ARGN:
value = message_get_argN (message, element->arg, FALSE);
break;
case MATCH_ELEMENT_ARGNPATH:
check_type = CHECK_TYPE_PATH_RELATED;
value = message_get_argN (message, element->arg, TRUE);
break;
default:
case MATCH_ELEMENT_TYPE:
case MATCH_ELEMENT_EAVESDROP:
g_assert_not_reached ();
}
if (value == NULL)
return FALSE;
switch (check_type)
{
case CHECK_TYPE_STRING:
if (strcmp (element->value, value) != 0)
return FALSE;
break;
case CHECK_TYPE_NAME:
name = name_lookup (daemon, element->value);
if (name != NULL && name->owner != NULL)
{
if (strcmp (name->owner->client->id, value) != 0)
return FALSE;
}
else if (strcmp (element->value, value) != 0)
return FALSE;
break;
case CHECK_TYPE_PATH_PREFIX:
len = strlen (element->value);
/* Make sure to handle the case of element->value == '/'. */
if (len == 1)
break;
/* Fail if there's no prefix match, or if the prefix match doesn't
* finish at the end of or at a separator in the @value. */
if (!g_str_has_prefix (value, element->value))
return FALSE;
if (value[len] != 0 && value[len] != '/')
return FALSE;
break;
case CHECK_TYPE_PATH_RELATED:
len = strlen (element->value);
len2 = strlen (value);
if (!(strcmp (value, element->value) == 0 ||
(len2 > 0 && value[len2-1] == '/' && g_str_has_prefix (element->value, value)) ||
(len > 0 && element->value[len-1] == '/' && g_str_has_prefix (value, element->value))))
return FALSE;
break;
case CHECK_TYPE_NAMESPACE_PREFIX:
len = strlen (element->value);
if (!(g_str_has_prefix (value, element->value) &&
(value[len] == 0 || value[len] == '.')))
return FALSE;
break;
default:
g_assert_not_reached ();
}
}
return TRUE;
}
static void
broadcast_message (GDBusDaemon *daemon,
GDBusMessage *message,
gboolean has_destination,
gboolean preserve_serial,
Client *not_to)
{
GList *clients, *l, *ll;
GDBusMessage *copy;
clients = g_hash_table_get_values (daemon->clients);
for (l = clients; l != NULL; l = l->next)
{
Client *client = l->data;
if (client == not_to)
continue;
for (ll = client->matches; ll != NULL; ll = ll->next)
{
Match *match = ll->data;
if (match_matches (daemon, match, message, has_destination))
break;
}
if (ll != NULL)
{
copy = g_dbus_message_copy (message, NULL);
if (copy)
{
g_dbus_connection_send_message (client->connection, copy,
preserve_serial?G_DBUS_SEND_MESSAGE_FLAGS_PRESERVE_SERIAL:0, NULL, NULL);
g_object_unref (copy);
}
}
}
g_list_free (clients);
}
static void
send_name_owner_changed (GDBusDaemon *daemon,
const char *name,
const char *old_owner,
const char *new_owner)
{
GDBusMessage *signal_message;
signal_message = g_dbus_message_new_signal ("/org/freedesktop/DBus",
"org.freedesktop.DBus",
"NameOwnerChanged");
g_dbus_message_set_body (signal_message,
g_variant_new ("(sss)",
name,
old_owner ? old_owner : "",
new_owner ? new_owner : ""));
broadcast_message (daemon, signal_message, FALSE, FALSE, NULL);
g_object_unref (signal_message);
}
static gboolean
name_unqueue_owner (Name *name, Client *client)
{
GList *l;
for (l = name->queue; l != NULL; l = l->next)
{
NameOwner *other = l->data;
if (other->client == client)
{
name->queue = g_list_delete_link (name->queue, l);
name_unref (name);
name_owner_free (other);
return TRUE;
}
}
return FALSE;
}
static void
name_replace_owner (Name *name, NameOwner *owner)
{
GDBusDaemon *daemon = name->daemon;
NameOwner *old_owner;
char *old_name = NULL, *new_name = NULL;
Client *new_client = NULL;
if (owner)
new_client = owner->client;
name_ref (name);
old_owner = name->owner;
if (old_owner)
{
Client *old_client = old_owner->client;
g_assert (old_owner->client != new_client);
g_dbus_connection_emit_signal (old_client->connection,
NULL, "/org/freedesktop/DBus",
"org.freedesktop.DBus", "NameLost",
g_variant_new ("(s)",
name->name), NULL);
old_name = g_strdup (old_client->id);
if (old_owner->flags & DBUS_NAME_FLAG_DO_NOT_QUEUE)
{
name_unref (name);
name_owner_free (old_owner);
}
else
name->queue = g_list_prepend (name->queue, old_owner);
}
name->owner = owner;
if (owner)
{
name_unqueue_owner (name, owner->client);
name_ref (name);
new_name = new_client->id;
g_dbus_connection_emit_signal (new_client->connection,
NULL, "/org/freedesktop/DBus",
"org.freedesktop.DBus", "NameAcquired",
g_variant_new ("(s)",
name->name), NULL);
}
send_name_owner_changed (daemon, name->name, old_name, new_name);
g_free (old_name);
name_unref (name);
}
static void
name_release_owner (Name *name)
{
NameOwner *next_owner = NULL;
name_ref (name);
/* Will someone else take over? */
if (name->queue)
{
next_owner = name->queue->data;
name_unref (name);
name->queue = g_list_delete_link (name->queue, name->queue);
}
name->owner->flags |= DBUS_NAME_FLAG_DO_NOT_QUEUE;
name_replace_owner (name, next_owner);
name_unref (name);
}
static void
name_queue_owner (Name *name, NameOwner *owner)
{
GList *l;
for (l = name->queue; l != NULL; l = l->next)
{
NameOwner *other = l->data;
if (other->client == owner->client)
{
other->flags = owner->flags;
name_owner_free (owner);
return;
}
}
name->queue = g_list_append (name->queue, owner);
name_ref (name);
}
static Client *
client_new (GDBusDaemon *daemon, GDBusConnection *connection)
{
Client *client;
GError *error = NULL;
client = g_new0 (Client, 1);
client->daemon = daemon;
client->id = g_strdup_printf (":%d.%d", daemon->next_major_id, daemon->next_minor_id);
client->connection = g_object_ref (connection);
if (daemon->next_minor_id == G_MAXUINT32)
{
daemon->next_minor_id = 0;
daemon->next_major_id++;
}
else
daemon->next_minor_id++;
g_object_set_data (G_OBJECT (connection), "client", client);
g_hash_table_insert (daemon->clients, client->id, client);
g_dbus_interface_skeleton_export (G_DBUS_INTERFACE_SKELETON (daemon), connection,
"/org/freedesktop/DBus", &error);
g_assert_no_error (error);
g_signal_connect (connection, "closed", G_CALLBACK (connection_closed), client);
g_dbus_connection_add_filter (connection,
filter_function,
client, NULL);
send_name_owner_changed (daemon, client->id, NULL, client->id);
return client;
}
static void
client_free (Client *client)
{
GDBusDaemon *daemon = client->daemon;
GList *l, *names;
g_dbus_interface_skeleton_unexport_from_connection (G_DBUS_INTERFACE_SKELETON (daemon),
client->connection);
g_hash_table_remove (daemon->clients, client->id);
names = g_hash_table_get_values (daemon->names);
for (l = names; l != NULL; l = l->next)
{
Name *name = l->data;
name_ref (name);
if (name->owner && name->owner->client == client)
{
/* Help static analysers with the refcount at this point. */
g_assert (name->refcount >= 2);
name_release_owner (name);
}
name_unqueue_owner (name, client);
name_unref (name);
}
g_list_free (names);
send_name_owner_changed (daemon, client->id, client->id, NULL);
g_object_unref (client->connection);
for (l = client->matches; l != NULL; l = l->next)
match_free (l->data);
g_list_free (client->matches);
g_free (client->id);
g_free (client);
}
static gboolean
idle_timeout_cb (gpointer user_data)
{
GDBusDaemon *daemon = user_data;
daemon->timeout = 0;
g_signal_emit (daemon,
g_dbus_daemon_signals[SIGNAL_IDLE_TIMEOUT],
0);
return G_SOURCE_REMOVE;
}
static void
connection_closed (GDBusConnection *connection,
gboolean remote_peer_vanished,
GError *error,
Client *client)
{
GDBusDaemon *daemon = client->daemon;
client_free (client);
if (g_hash_table_size (daemon->clients) == 0)
daemon->timeout = g_timeout_add (IDLE_TIMEOUT_MSEC,
idle_timeout_cb,
daemon);
}
static gboolean
handle_add_match (_GFreedesktopDBus *object,
GDBusMethodInvocation *invocation,
const gchar *arg_rule)
{
Client *client = g_object_get_data (G_OBJECT (g_dbus_method_invocation_get_connection (invocation)), "client");
Match *match;
match = match_new (arg_rule);
if (match == NULL)
g_dbus_method_invocation_return_error (invocation,
G_DBUS_ERROR, G_DBUS_ERROR_MATCH_RULE_INVALID,
"Invalid rule: %s", arg_rule);
else
{
client->matches = g_list_prepend (client->matches, match);
_g_freedesktop_dbus_complete_add_match (object, invocation);
}
return TRUE;
}
static gboolean
handle_get_connection_selinux_security_context (_GFreedesktopDBus *object,
GDBusMethodInvocation *invocation,
const gchar *arg_name)
{
g_dbus_method_invocation_return_error (invocation,
G_DBUS_ERROR, G_DBUS_ERROR_SELINUX_SECURITY_CONTEXT_UNKNOWN,
"selinux context not supported");
_g_freedesktop_dbus_complete_get_connection_selinux_security_context (object, invocation, "");
return TRUE;
}
static gboolean
handle_get_connection_unix_process_id (_GFreedesktopDBus *object,
GDBusMethodInvocation *invocation,
const gchar *arg_name)
{
g_dbus_method_invocation_return_error (invocation,
G_DBUS_ERROR, G_DBUS_ERROR_UNIX_PROCESS_ID_UNKNOWN,
"connection pid not supported");
return TRUE;
}
static gboolean
handle_get_connection_unix_user (_GFreedesktopDBus *object,
GDBusMethodInvocation *invocation,
const gchar *arg_name)
{
g_dbus_method_invocation_return_error (invocation,
G_DBUS_ERROR, G_DBUS_ERROR_UNIX_PROCESS_ID_UNKNOWN,
"connection user not supported");
return TRUE;
}
static gboolean
handle_get_id (_GFreedesktopDBus *object,
GDBusMethodInvocation *invocation)
{
GDBusDaemon *daemon = G_DBUS_DAEMON (object);
_g_freedesktop_dbus_complete_get_id (object, invocation,
daemon->guid);
return TRUE;
}
static gboolean
handle_get_name_owner (_GFreedesktopDBus *object,
GDBusMethodInvocation *invocation,
const gchar *arg_name)
{
GDBusDaemon *daemon = G_DBUS_DAEMON (object);
Name *name;
if (strcmp (arg_name, DBUS_SERVICE_NAME) == 0)
{
_g_freedesktop_dbus_complete_get_name_owner (object, invocation, DBUS_SERVICE_NAME);
return TRUE;
}
if (arg_name[0] == ':')
{
if (g_hash_table_lookup (daemon->clients, arg_name) == NULL)
g_dbus_method_invocation_return_error (invocation,
G_DBUS_ERROR, G_DBUS_ERROR_NAME_HAS_NO_OWNER,
"Could not get owner of name '%s': no such name", arg_name);
else
_g_freedesktop_dbus_complete_get_name_owner (object, invocation, arg_name);
return TRUE;
}
name = name_lookup (daemon, arg_name);
if (name == NULL || name->owner == NULL)
{
g_dbus_method_invocation_return_error (invocation,
G_DBUS_ERROR, G_DBUS_ERROR_NAME_HAS_NO_OWNER,
"Could not get owner of name '%s': no such name", arg_name);
return TRUE;
}
_g_freedesktop_dbus_complete_get_name_owner (object, invocation, name->owner->client->id);
return TRUE;
}
static gboolean
handle_hello (_GFreedesktopDBus *object,
GDBusMethodInvocation *invocation)
{
Client *client = g_object_get_data (G_OBJECT (g_dbus_method_invocation_get_connection (invocation)), "client");
_g_freedesktop_dbus_complete_hello (object, invocation, client->id);
g_dbus_connection_emit_signal (client->connection,
NULL, "/org/freedesktop/DBus",
"org.freedesktop.DBus", "NameAcquired",
g_variant_new ("(s)",
client->id), NULL);
return TRUE;
}
static gboolean
handle_list_activatable_names (_GFreedesktopDBus *object,
GDBusMethodInvocation *invocation)
{
const char *names[] = { NULL };
_g_freedesktop_dbus_complete_list_activatable_names (object,
invocation,
names);
return TRUE;
}
static gboolean
handle_list_names (_GFreedesktopDBus *object,
GDBusMethodInvocation *invocation)
{
GDBusDaemon *daemon = G_DBUS_DAEMON (object);
GPtrArray *array;
GPtrArray *clients, *names;
clients = g_hash_table_get_values_as_ptr_array (daemon->clients);
array = g_steal_pointer (&clients);
names = g_hash_table_get_values_as_ptr_array (daemon->names);
g_ptr_array_extend_and_steal (array, g_steal_pointer (&names));
g_ptr_array_add (array, NULL);
_g_freedesktop_dbus_complete_list_names (object,
invocation,
(const gchar * const*)array->pdata);
g_ptr_array_free (array, TRUE);
return TRUE;
}
static gboolean
handle_list_queued_owners (_GFreedesktopDBus *object,
GDBusMethodInvocation *invocation,
const gchar *arg_name)
{
GDBusDaemon *daemon = G_DBUS_DAEMON (object);
GPtrArray *array;
Name *name;
GList *l;
array = g_ptr_array_new ();
name = name_lookup (daemon, arg_name);
if (name && name->owner)
{
for (l = name->queue; l != NULL; l = l->next)
{
Client *client = l->data;
g_ptr_array_add (array, client->id);
}
}
g_ptr_array_add (array, NULL);
_g_freedesktop_dbus_complete_list_queued_owners (object,
invocation,
(const gchar * const*)array->pdata);
g_ptr_array_free (array, TRUE);
return TRUE;
}
static gboolean
handle_name_has_owner (_GFreedesktopDBus *object,
GDBusMethodInvocation *invocation,
const gchar *arg_name)
{
GDBusDaemon *daemon = G_DBUS_DAEMON (object);
Name *name;
Client *client;
name = name_lookup (daemon, arg_name);
client = g_hash_table_lookup (daemon->clients, arg_name);
_g_freedesktop_dbus_complete_name_has_owner (object, invocation,
name != NULL || client != NULL);
return TRUE;
}
static gboolean
handle_release_name (_GFreedesktopDBus *object,
GDBusMethodInvocation *invocation,
const gchar *arg_name)
{
Client *client = g_object_get_data (G_OBJECT (g_dbus_method_invocation_get_connection (invocation)), "client");
GDBusDaemon *daemon = G_DBUS_DAEMON (object);
Name *name;
guint32 result;
if (!g_dbus_is_name (arg_name))
{
g_dbus_method_invocation_return_error (invocation,
G_DBUS_ERROR, G_DBUS_ERROR_INVALID_ARGS,
"Given bus name \"%s\" is not valid", arg_name);
return TRUE;
}
if (*arg_name == ':')
{
g_dbus_method_invocation_return_error (invocation,
G_DBUS_ERROR, G_DBUS_ERROR_INVALID_ARGS,
"Cannot release a service starting with ':' such as \"%s\"", arg_name);
return TRUE;
}
if (strcmp (arg_name, DBUS_SERVICE_NAME) == 0)
{
g_dbus_method_invocation_return_error (invocation,
G_DBUS_ERROR, G_DBUS_ERROR_INVALID_ARGS,
"Cannot release a service named " DBUS_SERVICE_NAME ", because that is owned by the bus");
return TRUE;
}
name = name_lookup (daemon, arg_name);
if (name == NULL)
result = DBUS_RELEASE_NAME_REPLY_NON_EXISTENT;
else if (name->owner && name->owner->client == client)
{
name_release_owner (name);
result = DBUS_RELEASE_NAME_REPLY_RELEASED;
}
else if (name_unqueue_owner (name, client))
result = DBUS_RELEASE_NAME_REPLY_RELEASED;
else
result = DBUS_RELEASE_NAME_REPLY_NOT_OWNER;
_g_freedesktop_dbus_complete_release_name (object, invocation, result);
return TRUE;
}
static gboolean
handle_reload_config (_GFreedesktopDBus *object,
GDBusMethodInvocation *invocation)
{
_g_freedesktop_dbus_complete_reload_config (object, invocation);
return TRUE;
}
static gboolean
handle_update_activation_environment (_GFreedesktopDBus *object,
GDBusMethodInvocation *invocation,
GVariant *arg_environment)
{
g_dbus_method_invocation_return_error (invocation,
G_DBUS_ERROR, G_DBUS_ERROR_FAILED,
"UpdateActivationEnvironment not implemented");
return TRUE;
}
static gboolean
handle_remove_match (_GFreedesktopDBus *object,
GDBusMethodInvocation *invocation,
const gchar *arg_rule)
{
Client *client = g_object_get_data (G_OBJECT (g_dbus_method_invocation_get_connection (invocation)), "client");
Match *match, *other_match;
GList *l;
match = match_new (arg_rule);
if (match == NULL)
g_dbus_method_invocation_return_error (invocation,
G_DBUS_ERROR, G_DBUS_ERROR_MATCH_RULE_INVALID,
"Invalid rule: %s", arg_rule);
else
{
for (l = client->matches; l != NULL; l = l->next)
{
other_match = l->data;
if (match_equal (match, other_match))
{
match_free (other_match);
client->matches = g_list_delete_link (client->matches, l);
break;
}
}
if (l == NULL)
g_dbus_method_invocation_return_error (invocation,
G_DBUS_ERROR, G_DBUS_ERROR_MATCH_RULE_NOT_FOUND,
"The given match rule wasn't found and can't be removed");
else
_g_freedesktop_dbus_complete_remove_match (object, invocation);
}
if (match)
match_free (match);
return TRUE;
}
static gboolean
handle_request_name (_GFreedesktopDBus *object,
GDBusMethodInvocation *invocation,
const gchar *arg_name,
guint flags)
{
Client *client = g_object_get_data (G_OBJECT (g_dbus_method_invocation_get_connection (invocation)), "client");
GDBusDaemon *daemon = G_DBUS_DAEMON (object);
Name *name;
NameOwner *owner;
guint32 result;
if (!g_dbus_is_name (arg_name))
{
g_dbus_method_invocation_return_error (invocation,
G_DBUS_ERROR, G_DBUS_ERROR_INVALID_ARGS,
"Requested bus name \"%s\" is not valid", arg_name);
return TRUE;
}
if (*arg_name == ':')
{
g_dbus_method_invocation_return_error (invocation,
G_DBUS_ERROR, G_DBUS_ERROR_INVALID_ARGS,
"Cannot acquire a service starting with ':' such as \"%s\"", arg_name);
return TRUE;
}
if (strcmp (arg_name, DBUS_SERVICE_NAME) == 0)
{
g_dbus_method_invocation_return_error (invocation,
G_DBUS_ERROR, G_DBUS_ERROR_INVALID_ARGS,
"Cannot acquire a service named " DBUS_SERVICE_NAME ", because that is reserved");
return TRUE;
}
name = name_ensure (daemon, arg_name);
if (name->owner == NULL)
{
owner = name_owner_new (client, flags);
name_replace_owner (name, owner);
result = DBUS_REQUEST_NAME_REPLY_PRIMARY_OWNER;
}
else if (name->owner && name->owner->client == client)
{
name->owner->flags = flags;
result = DBUS_REQUEST_NAME_REPLY_ALREADY_OWNER;
}
else if ((flags & DBUS_NAME_FLAG_DO_NOT_QUEUE) &&
(!(flags & DBUS_NAME_FLAG_REPLACE_EXISTING) ||
!(name->owner->flags & DBUS_NAME_FLAG_ALLOW_REPLACEMENT)))
{
/* Unqueue if queued */
name_unqueue_owner (name, client);
result = DBUS_REQUEST_NAME_REPLY_EXISTS;
}
else if (!(flags & DBUS_NAME_FLAG_DO_NOT_QUEUE) &&
(!(flags & DBUS_NAME_FLAG_REPLACE_EXISTING) ||
!(name->owner->flags & DBUS_NAME_FLAG_ALLOW_REPLACEMENT)))
{
/* Queue the connection */
owner = name_owner_new (client, flags);
name_queue_owner (name, owner);
result = DBUS_REQUEST_NAME_REPLY_IN_QUEUE;
}
else
{
/* Replace the current owner */
owner = name_owner_new (client, flags);
name_replace_owner (name, owner);
result = DBUS_REQUEST_NAME_REPLY_PRIMARY_OWNER;
}
name_unref (name);
_g_freedesktop_dbus_complete_request_name (object, invocation, result);
return TRUE;
}
static gboolean
handle_start_service_by_name (_GFreedesktopDBus *object,
GDBusMethodInvocation *invocation,
const gchar *arg_name,
guint arg_flags)
{
GDBusDaemon *daemon = G_DBUS_DAEMON (object);
Name *name;
name = name_lookup (daemon, arg_name);
if (name)
_g_freedesktop_dbus_complete_start_service_by_name (object, invocation,
DBUS_START_REPLY_ALREADY_RUNNING);
else
g_dbus_method_invocation_return_error (invocation,
G_DBUS_ERROR, G_DBUS_ERROR_SERVICE_UNKNOWN,
"No support for activation for name: %s", arg_name);
return TRUE;
}
G_GNUC_PRINTF(5, 6)
static void
return_error (Client *client, GDBusMessage *message,
GQuark domain,
gint code,
const gchar *format,
...)
{
GDBusMessage *reply;
va_list var_args;
char *error_message;
GError *error;
gchar *dbus_error_name;
va_start (var_args, format);
error_message = g_strdup_vprintf (format, var_args);
va_end (var_args);
error = g_error_new_literal (domain, code, "");
dbus_error_name = g_dbus_error_encode_gerror (error);
reply = g_dbus_message_new_method_error_literal (message,
dbus_error_name,
error_message);
g_error_free (error);
g_free (dbus_error_name);
g_free (error_message);
if (!g_dbus_connection_send_message (client->connection, reply, G_DBUS_SEND_MESSAGE_FLAGS_NONE, NULL, NULL))
g_warning ("Error sending reply");
g_object_unref (reply);
}
static GDBusMessage *
route_message (Client *source_client, GDBusMessage *message)
{
const char *dest;
Client *dest_client;
GDBusDaemon *daemon;
daemon = source_client->daemon;
dest_client = NULL;
dest = g_dbus_message_get_destination (message);
if (dest != NULL && strcmp (dest, DBUS_SERVICE_NAME) != 0)
{
dest_client = g_hash_table_lookup (daemon->clients, dest);
if (dest_client == NULL)
{
Name *name;
name = name_lookup (daemon, dest);
if (name && name->owner)
dest_client = name->owner->client;
}
if (dest_client == NULL)
{
if (g_dbus_message_get_message_type (message) == G_DBUS_MESSAGE_TYPE_METHOD_CALL)
return_error (source_client, message,
G_DBUS_ERROR, G_DBUS_ERROR_SERVICE_UNKNOWN,
"The name %s is unknown", dest);
}
else
{
GError *error = NULL;
if (!g_dbus_connection_send_message (dest_client->connection, message, G_DBUS_SEND_MESSAGE_FLAGS_PRESERVE_SERIAL, NULL, &error))
{
g_warning ("Error forwarding message: %s", error->message);
g_error_free (error);
}
}
}
broadcast_message (daemon, message, dest_client != NULL, TRUE, dest_client);
/* Swallow messages not for the bus */
if (dest == NULL || strcmp (dest, DBUS_SERVICE_NAME) != 0)
{
g_object_unref (message);
message = NULL;
}
return message;
}
static GDBusMessage *
copy_if_locked (GDBusMessage *message)
{
if (g_dbus_message_get_locked (message))
{
GDBusMessage *copy = g_dbus_message_copy (message, NULL);
g_object_unref (message);
message = copy;
}
return message;
}
static GDBusMessage *
filter_function (GDBusConnection *connection,
GDBusMessage *message,
gboolean incoming,
gpointer user_data)
{
Client *client = user_data;
if (0)
{
const char *types[] = {"invalid", "method_call", "method_return", "error", "signal" };
g_printerr ("%s%s %s %d(%d) sender: %s destination: %s %s %s.%s\n",
client->id,
incoming? "->" : "<-",
types[g_dbus_message_get_message_type (message)],
g_dbus_message_get_serial (message),
g_dbus_message_get_reply_serial (message),
g_dbus_message_get_sender (message),
g_dbus_message_get_destination (message),
g_dbus_message_get_path (message),
g_dbus_message_get_interface (message),
g_dbus_message_get_member (message));
}
if (incoming)
{
/* Ensure its not locked so we can set the sender */
message = copy_if_locked (message);
if (message == NULL)
{
g_warning ("Failed to copy incoming message");
return NULL;
}
g_dbus_message_set_sender (message, client->id);
return route_message (client, message);
}
else
{
if (g_dbus_message_get_sender (message) == NULL ||
g_dbus_message_get_destination (message) == NULL)
{
message = copy_if_locked (message);
if (message == NULL)
{
g_warning ("Failed to copy outgoing message");
return NULL;
}
}
if (g_dbus_message_get_sender (message) == NULL)
g_dbus_message_set_sender (message, DBUS_SERVICE_NAME);
if (g_dbus_message_get_destination (message) == NULL)
g_dbus_message_set_destination (message, client->id);
}
return message;
}
static gboolean
on_new_connection (GDBusServer *server,
GDBusConnection *connection,
gpointer user_data)
{
GDBusDaemon *daemon = user_data;
g_dbus_connection_set_exit_on_close (connection, FALSE);
if (daemon->timeout)
{
g_source_remove (daemon->timeout);
daemon->timeout = 0;
}
client_new (daemon, connection);
return TRUE;
}
static void
g_dbus_daemon_finalize (GObject *object)
{
GDBusDaemon *daemon = G_DBUS_DAEMON (object);
GList *clients, *l;
if (daemon->timeout)
g_source_remove (daemon->timeout);
clients = g_hash_table_get_values (daemon->clients);
for (l = clients; l != NULL; l = l->next)
client_free (l->data);
g_list_free (clients);
g_assert (g_hash_table_size (daemon->clients) == 0);
g_assert (g_hash_table_size (daemon->names) == 0);
g_hash_table_destroy (daemon->clients);
g_hash_table_destroy (daemon->names);
g_object_unref (daemon->server);
if (daemon->tmpdir)
{
g_rmdir (daemon->tmpdir);
g_free (daemon->tmpdir);
}
g_free (daemon->guid);
g_free (daemon->address);
G_OBJECT_CLASS (g_dbus_daemon_parent_class)->finalize (object);
}
static void
g_dbus_daemon_init (GDBusDaemon *daemon)
{
daemon->next_major_id = 1;
daemon->clients = g_hash_table_new_full (g_str_hash, g_str_equal, NULL, NULL);
daemon->names = g_hash_table_new_full (g_str_hash, g_str_equal, NULL, NULL);
daemon->guid = g_dbus_generate_guid ();
}
static gboolean
initable_init (GInitable *initable,
GCancellable *cancellable,
GError **error)
{
GDBusDaemon *daemon = G_DBUS_DAEMON (initable);
GDBusServerFlags flags;
flags = G_DBUS_SERVER_FLAGS_NONE;
if (daemon->address == NULL)
{
#ifdef G_OS_UNIX
daemon->tmpdir = g_dir_make_tmp ("gdbus-daemon-XXXXXX", NULL);
daemon->address = g_strdup_printf ("unix:tmpdir=%s", daemon->tmpdir);
flags |= G_DBUS_SERVER_FLAGS_AUTHENTICATION_REQUIRE_SAME_USER;
#else
/* Don’t require authentication on Windows as that hasn’t been
* implemented yet. */
daemon->address = g_strdup ("nonce-tcp:");
flags |= G_DBUS_SERVER_FLAGS_AUTHENTICATION_ALLOW_ANONYMOUS;
#endif
}
daemon->server = g_dbus_server_new_sync (daemon->address,
flags,
daemon->guid,
NULL,
cancellable,
error);
if (daemon->server == NULL)
return FALSE;
g_dbus_server_start (daemon->server);
g_signal_connect (daemon->server, "new-connection",
G_CALLBACK (on_new_connection),
daemon);
return TRUE;
}
static void
g_dbus_daemon_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
GDBusDaemon *daemon = G_DBUS_DAEMON (object);
switch (prop_id)
{
case PROP_ADDRESS:
g_free (daemon->address);
daemon->address = g_value_dup_string (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
}
}
static void
g_dbus_daemon_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
GDBusDaemon *daemon = G_DBUS_DAEMON (object);
switch (prop_id)
{
case PROP_ADDRESS:
g_value_set_string (value, daemon->address);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
}
}
static void
g_dbus_daemon_class_init (GDBusDaemonClass *klass)
{
GObjectClass *gobject_class;
gobject_class = G_OBJECT_CLASS (klass);
gobject_class->finalize = g_dbus_daemon_finalize;
gobject_class->set_property = g_dbus_daemon_set_property;
gobject_class->get_property = g_dbus_daemon_get_property;
g_dbus_daemon_signals[SIGNAL_IDLE_TIMEOUT] =
g_signal_new (I_("idle-timeout"),
G_TYPE_DBUS_DAEMON,
G_SIGNAL_RUN_LAST,
0,
NULL, NULL,
NULL,
G_TYPE_NONE, 0);
g_object_class_install_property (gobject_class,
PROP_ADDRESS,
g_param_spec_string ("address", NULL, NULL,
NULL,
G_PARAM_READWRITE |
G_PARAM_CONSTRUCT_ONLY |
G_PARAM_STATIC_STRINGS));
}
static void
g_dbus_daemon_iface_init (_GFreedesktopDBusIface *iface)
{
iface->handle_add_match = handle_add_match;
iface->handle_get_connection_selinux_security_context = handle_get_connection_selinux_security_context;
iface->handle_get_connection_unix_process_id = handle_get_connection_unix_process_id;
iface->handle_get_connection_unix_user = handle_get_connection_unix_user;
iface->handle_get_id = handle_get_id;
iface->handle_get_name_owner = handle_get_name_owner;
iface->handle_hello = handle_hello;
iface->handle_list_activatable_names = handle_list_activatable_names;
iface->handle_list_names = handle_list_names;
iface->handle_list_queued_owners = handle_list_queued_owners;
iface->handle_name_has_owner = handle_name_has_owner;
iface->handle_release_name = handle_release_name;
iface->handle_reload_config = handle_reload_config;
iface->handle_update_activation_environment = handle_update_activation_environment;
iface->handle_remove_match = handle_remove_match;
iface->handle_request_name = handle_request_name;
iface->handle_start_service_by_name = handle_start_service_by_name;
}
static void
initable_iface_init (GInitableIface *initable_iface)
{
initable_iface->init = initable_init;
}
GDBusDaemon *
_g_dbus_daemon_new (const char *address,
GCancellable *cancellable,
GError **error)
{
return g_initable_new (G_TYPE_DBUS_DAEMON,
cancellable,
error,
"address", address,
NULL);
}
const char *
_g_dbus_daemon_get_address (GDBusDaemon *daemon)
{
return g_dbus_server_get_client_address (daemon->server);
}
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