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/*
SSSD
SystemBus Helpers
Copyright (C) Stephen Gallagher <sgallagh@redhat.com> 2009
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 3 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, see <http://www.gnu.org/licenses/>.
*/
#include "talloc.h"
#include "tevent.h"
#include "util/util.h"
#include "dbus/dbus.h"
#include "sbus/sssd_dbus.h"
#include "sysbus.h"
#include "infopipe/infopipe.h"
struct sysbus_ctx {
struct sbus_conn_ctx *sconn;
struct sbus_method_ctx *service_methods;
void *pvt_data;
};
static int sysbus_destructor(TALLOC_CTX *ctx) {
struct sysbus_ctx *system_bus = talloc_get_type(ctx, struct sysbus_ctx);
dbus_connection_unref(sbus_get_connection(system_bus->sconn));
return EOK;
}
static int sysbus_init_methods(TALLOC_CTX *mem_ctx,
struct sysbus_ctx *sysbus,
const char *interface,
const char *path,
struct sbus_method *methods,
sbus_msg_handler_fn introspect_method,
struct sbus_method_ctx **sm_ctx)
{
int ret;
TALLOC_CTX *tmp_ctx;
struct sbus_method_ctx *method_ctx;
tmp_ctx = talloc_new(mem_ctx);
if(!tmp_ctx) {
return ENOMEM;
}
method_ctx = talloc_zero(tmp_ctx, struct sbus_method_ctx);
if (!method_ctx) {
ret = ENOMEM;
goto done;
}
method_ctx->interface = talloc_strdup(method_ctx, interface);
if (method_ctx->interface == NULL) {
ret = ENOMEM;
goto done;
}
method_ctx->path = talloc_strdup(method_ctx, path);
if (method_ctx->path == NULL) {
ret = ENOMEM;
goto done;
}
method_ctx->methods = methods;
method_ctx->introspect_fn = introspect_method;
method_ctx->message_handler = sbus_message_handler;
*sm_ctx = method_ctx;
talloc_steal(mem_ctx, method_ctx);
ret = EOK;
done:
talloc_free(tmp_ctx);
return ret;
}
int sysbus_init(TALLOC_CTX *mem_ctx, struct sysbus_ctx **sysbus,
struct tevent_context *ev, const char *dbus_name,
const char *interface, const char *path,
struct sbus_method *methods,
sbus_msg_handler_fn introspect_method)
{
DBusError dbus_error;
DBusConnection *conn;
struct sysbus_ctx *system_bus;
int ret;
system_bus = talloc_zero(mem_ctx, struct sysbus_ctx);
if (system_bus == NULL) {
return ENOMEM;
}
dbus_error_init(&dbus_error);
/* Connect to the well-known system bus */
conn = dbus_bus_get(DBUS_BUS_SYSTEM, &dbus_error);
if (conn == NULL) {
DEBUG(0, ("Failed to connect to D-BUS system bus.\n"));
talloc_free(system_bus);
return EIO;
}
dbus_connection_set_exit_on_disconnect(conn, FALSE);
talloc_set_destructor((TALLOC_CTX *)system_bus,
sysbus_destructor);
ret = dbus_bus_request_name(conn,
dbus_name,
/* We want exclusive access */
DBUS_NAME_FLAG_DO_NOT_QUEUE,
&dbus_error
);
if (ret != DBUS_REQUEST_NAME_REPLY_PRIMARY_OWNER) {
/* We were unable to register on the system bus */
DEBUG(0, ("Unable to request name on the system bus. Error: %s\n", dbus_error.message));
if (dbus_error_is_set(&dbus_error)) dbus_error_free(&dbus_error);
talloc_free(system_bus);
return EIO;
}
DEBUG(1, ("Listening on %s\n", dbus_name));
/* Integrate with TEvent loop */
ret = sbus_add_connection(system_bus, ev, conn, &system_bus->sconn, SBUS_CONN_TYPE_SHARED);
if (ret != EOK) {
DEBUG(0, ("Could not integrate D-BUS into mainloop.\n"));
talloc_free(system_bus);
return ret;
}
/* Set up methods */
ret = sysbus_init_methods(system_bus, system_bus, interface, path,
methods, introspect_method,
&system_bus->service_methods);
if (ret != EOK) {
DEBUG(0, ("Could not set up service methods.\n"));
talloc_free(system_bus);
return ret;
}
ret = sbus_conn_add_method_ctx(system_bus->sconn, system_bus->service_methods);
if (ret != EOK) {
DEBUG(0, ("Could not add service methods to the connection.\n"));
talloc_free(system_bus);
return ret;
}
*sysbus = system_bus;
return EOK;
}
struct sbus_conn_ctx *sysbus_get_sbus_conn(struct sysbus_ctx *sysbus)
{
return sysbus->sconn;
}
char *sysbus_get_caller(TALLOC_CTX *mem_ctx, DBusMessage *message, struct sbus_conn_ctx *sconn)
{
char *caller;
const char *conn_name;
DBusError error;
uid_t uid;
/* Get the connection UID */
conn_name = dbus_message_get_sender(message);
if (conn_name == NULL) {
DEBUG(0, ("Critical error: D-BUS client has no unique name\n"));
return NULL;
}
dbus_error_init(&error);
uid = dbus_bus_get_unix_user(sbus_get_connection(sconn), conn_name, &error);
if (uid == -1) {
DEBUG(0, ("Could not identify unix user. Error message was '%s:%s'\n", error.name, error.message));
dbus_error_free(&error);
return NULL;
}
caller = get_username_from_uid(mem_ctx, uid);
if (caller == NULL) {
DEBUG(0, ("No username matched the connected UID\n"));
return NULL;
}
return caller;
}
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