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https://github.com/systemd/systemd.git
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379 lines
12 KiB
C
379 lines
12 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <errno.h>
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#include "dbus.h"
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#include "log.h"
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#include "dbus-job.h"
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#include "dbus-common.h"
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#include "selinux-access.h"
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#define BUS_JOB_INTERFACE \
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" <interface name=\"org.freedesktop.systemd1.Job\">\n" \
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" <method name=\"Cancel\"/>\n" \
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" <property name=\"Id\" type=\"u\" access=\"read\"/>\n" \
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" <property name=\"Unit\" type=\"(so)\" access=\"read\"/>\n" \
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" <property name=\"JobType\" type=\"s\" access=\"read\"/>\n" \
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" <property name=\"State\" type=\"s\" access=\"read\"/>\n" \
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" </interface>\n"
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#define INTROSPECTION \
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DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE \
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"<node>\n" \
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BUS_JOB_INTERFACE \
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BUS_PROPERTIES_INTERFACE \
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BUS_PEER_INTERFACE \
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BUS_INTROSPECTABLE_INTERFACE \
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"</node>\n"
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const char bus_job_interface[] _introspect_("Job") = BUS_JOB_INTERFACE;
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#define INTERFACES_LIST \
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BUS_GENERIC_INTERFACES_LIST \
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"org.freedesktop.systemd1.Job\0"
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#define INVALIDATING_PROPERTIES \
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"State\0"
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static DEFINE_BUS_PROPERTY_APPEND_ENUM(bus_job_append_state, job_state, JobState);
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static DEFINE_BUS_PROPERTY_APPEND_ENUM(bus_job_append_type, job_type, JobType);
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static int bus_job_append_unit(DBusMessageIter *i, const char *property, void *data) {
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Job *j = data;
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DBusMessageIter sub;
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char *p;
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assert(i);
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assert(property);
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assert(j);
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if (!dbus_message_iter_open_container(i, DBUS_TYPE_STRUCT, NULL, &sub))
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return -ENOMEM;
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p = unit_dbus_path(j->unit);
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if (!p)
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return -ENOMEM;
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if (!dbus_message_iter_append_basic(&sub, DBUS_TYPE_STRING, &j->unit->id) ||
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!dbus_message_iter_append_basic(&sub, DBUS_TYPE_OBJECT_PATH, &p)) {
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free(p);
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return -ENOMEM;
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}
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free(p);
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if (!dbus_message_iter_close_container(i, &sub))
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return -ENOMEM;
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return 0;
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}
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static const BusProperty bus_job_properties[] = {
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{ "Id", bus_property_append_uint32, "u", offsetof(Job, id) },
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{ "State", bus_job_append_state, "s", offsetof(Job, state) },
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{ "JobType", bus_job_append_type, "s", offsetof(Job, type) },
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{ "Unit", bus_job_append_unit, "(so)", 0 },
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{ NULL, }
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};
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static DBusHandlerResult bus_job_message_dispatch(Job *j, DBusConnection *connection, DBusMessage *message) {
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_cleanup_dbus_message_unref_ DBusMessage *reply = NULL;
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if (dbus_message_is_method_call(message, "org.freedesktop.systemd1.Job", "Cancel")) {
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SELINUX_UNIT_ACCESS_CHECK(j->unit, connection, message, "stop");
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reply = dbus_message_new_method_return(message);
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if (!reply)
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return DBUS_HANDLER_RESULT_NEED_MEMORY;
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job_finish_and_invalidate(j, JOB_CANCELED, true);
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} else {
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const BusBoundProperties bps[] = {
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{ "org.freedesktop.systemd1.Job", bus_job_properties, j },
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{ NULL, }
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};
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SELINUX_UNIT_ACCESS_CHECK(j->unit, connection, message, "status");
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return bus_default_message_handler(connection, message, INTROSPECTION, INTERFACES_LIST, bps);
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}
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if (!dbus_connection_send(connection, reply, NULL))
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return DBUS_HANDLER_RESULT_NEED_MEMORY;
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return DBUS_HANDLER_RESULT_HANDLED;
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}
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static DBusHandlerResult bus_job_message_handler(DBusConnection *connection, DBusMessage *message, void *data) {
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Manager *m = data;
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Job *j;
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int r;
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_cleanup_dbus_message_unref_ DBusMessage *reply = NULL;
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assert(connection);
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assert(message);
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assert(m);
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if (streq(dbus_message_get_path(message), "/org/freedesktop/systemd1/job")) {
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/* Be nice to gdbus and return introspection data for our mid-level paths */
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if (dbus_message_is_method_call(message, "org.freedesktop.DBus.Introspectable", "Introspect")) {
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char *introspection = NULL;
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FILE *f;
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Iterator i;
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size_t size;
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SELINUX_ACCESS_CHECK(connection, message, "status");
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reply = dbus_message_new_method_return(message);
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if (!reply)
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goto oom;
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/* We roll our own introspection code here, instead of
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* relying on bus_default_message_handler() because we
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* need to generate our introspection string
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* dynamically. */
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f = open_memstream(&introspection, &size);
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if (!f)
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goto oom;
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fputs(DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE
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"<node>\n", f);
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fputs(BUS_INTROSPECTABLE_INTERFACE, f);
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fputs(BUS_PEER_INTERFACE, f);
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HASHMAP_FOREACH(j, m->jobs, i)
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fprintf(f, "<node name=\"job/%lu\"/>", (unsigned long) j->id);
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fputs("</node>\n", f);
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if (ferror(f)) {
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fclose(f);
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free(introspection);
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goto oom;
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}
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fclose(f);
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if (!introspection)
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goto oom;
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if (!dbus_message_append_args(reply, DBUS_TYPE_STRING, &introspection, DBUS_TYPE_INVALID)) {
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free(introspection);
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goto oom;
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}
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free(introspection);
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if (!dbus_connection_send(connection, reply, NULL))
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goto oom;
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return DBUS_HANDLER_RESULT_HANDLED;
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}
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return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
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}
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r = manager_get_job_from_dbus_path(m, dbus_message_get_path(message), &j);
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if (r == -ENOMEM)
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goto oom;
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if (r == -ENOENT) {
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DBusError e;
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dbus_error_init(&e);
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dbus_set_error_const(&e, DBUS_ERROR_UNKNOWN_OBJECT, "Unknown job");
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return bus_send_error_reply(connection, message, &e, r);
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}
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if (r < 0)
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return bus_send_error_reply(connection, message, NULL, r);
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return bus_job_message_dispatch(j, connection, message);
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oom:
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return DBUS_HANDLER_RESULT_NEED_MEMORY;
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}
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const DBusObjectPathVTable bus_job_vtable = {
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.message_function = bus_job_message_handler
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};
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static int job_send_message(Job *j, DBusMessage* (*new_message)(Job *j)) {
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DBusMessage *m = NULL;
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int r;
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assert(j);
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assert(new_message);
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if (bus_has_subscriber(j->manager) || j->forgot_bus_clients) {
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m = new_message(j);
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if (!m)
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goto oom;
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r = bus_broadcast(j->manager, m);
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dbus_message_unref(m);
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if (r < 0)
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return r;
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} else {
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/* If nobody is subscribed, we just send the message
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* to the client(s) which created the job */
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JobBusClient *cl;
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assert(j->bus_client_list);
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LIST_FOREACH(client, cl, j->bus_client_list) {
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assert(cl->bus);
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m = new_message(j);
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if (!m)
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goto oom;
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if (!dbus_message_set_destination(m, cl->name))
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goto oom;
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if (!dbus_connection_send(cl->bus, m, NULL))
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goto oom;
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dbus_message_unref(m);
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m = NULL;
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}
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}
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return 0;
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oom:
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if (m)
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dbus_message_unref(m);
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return -ENOMEM;
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}
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static DBusMessage* new_change_signal_message(Job *j) {
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DBusMessage *m = NULL;
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char *p = NULL;
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p = job_dbus_path(j);
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if (!p)
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goto oom;
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if (j->sent_dbus_new_signal) {
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/* Send a properties changed signal */
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m = bus_properties_changed_new(p, "org.freedesktop.systemd1.Job", INVALIDATING_PROPERTIES);
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if (!m)
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goto oom;
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} else {
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/* Send a new signal */
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m = dbus_message_new_signal("/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager", "JobNew");
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if (!m)
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goto oom;
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if (!dbus_message_append_args(m,
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DBUS_TYPE_UINT32, &j->id,
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DBUS_TYPE_OBJECT_PATH, &p,
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DBUS_TYPE_STRING, &j->unit->id,
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DBUS_TYPE_INVALID))
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goto oom;
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}
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return m;
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oom:
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if (m)
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dbus_message_unref(m);
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free(p);
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return NULL;
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}
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static DBusMessage* new_removed_signal_message(Job *j) {
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DBusMessage *m = NULL;
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char *p = NULL;
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const char *r;
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p = job_dbus_path(j);
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if (!p)
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goto oom;
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m = dbus_message_new_signal("/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager", "JobRemoved");
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if (!m)
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goto oom;
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r = job_result_to_string(j->result);
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if (!dbus_message_append_args(m,
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DBUS_TYPE_UINT32, &j->id,
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DBUS_TYPE_OBJECT_PATH, &p,
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DBUS_TYPE_STRING, &j->unit->id,
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DBUS_TYPE_STRING, &r,
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DBUS_TYPE_INVALID))
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goto oom;
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return m;
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oom:
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if (m)
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dbus_message_unref(m);
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free(p);
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return NULL;
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}
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void bus_job_send_change_signal(Job *j) {
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assert(j);
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if (j->in_dbus_queue) {
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LIST_REMOVE(Job, dbus_queue, j->manager->dbus_job_queue, j);
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j->in_dbus_queue = false;
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}
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if (!bus_has_subscriber(j->manager) && !j->bus_client_list && !j->forgot_bus_clients) {
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j->sent_dbus_new_signal = true;
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return;
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}
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if (job_send_message(j, new_change_signal_message) < 0)
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goto oom;
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j->sent_dbus_new_signal = true;
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return;
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oom:
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log_error("Failed to allocate job change signal.");
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}
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void bus_job_send_removed_signal(Job *j) {
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assert(j);
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if (!bus_has_subscriber(j->manager) && !j->bus_client_list && !j->forgot_bus_clients)
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return;
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if (!j->sent_dbus_new_signal)
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bus_job_send_change_signal(j);
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if (job_send_message(j, new_removed_signal_message) < 0)
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goto oom;
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return;
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oom:
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log_error("Failed to allocate job remove signal.");
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}
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