/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ /*** This file is part of systemd. Copyright 2010 Lennart Poettering systemd 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. systemd 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 systemd; If not, see <http://www.gnu.org/licenses/>. ***/ #include <errno.h> #include "dbus.h" #include "log.h" #include "dbus-job.h" #include "dbus-common.h" #include "selinux-access.h" #define BUS_JOB_INTERFACE \ " <interface name=\"org.freedesktop.systemd1.Job\">\n" \ " <method name=\"Cancel\"/>\n" \ " <property name=\"Id\" type=\"u\" access=\"read\"/>\n" \ " <property name=\"Unit\" type=\"(so)\" access=\"read\"/>\n" \ " <property name=\"JobType\" type=\"s\" access=\"read\"/>\n" \ " <property name=\"State\" type=\"s\" access=\"read\"/>\n" \ " </interface>\n" #define INTROSPECTION \ DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE \ "<node>\n" \ BUS_JOB_INTERFACE \ BUS_PROPERTIES_INTERFACE \ BUS_PEER_INTERFACE \ BUS_INTROSPECTABLE_INTERFACE \ "</node>\n" const char bus_job_interface[] _introspect_("Job") = BUS_JOB_INTERFACE; #define INTERFACES_LIST \ BUS_GENERIC_INTERFACES_LIST \ "org.freedesktop.systemd1.Job\0" #define INVALIDATING_PROPERTIES \ "State\0" static DEFINE_BUS_PROPERTY_APPEND_ENUM(bus_job_append_state, job_state, JobState); static DEFINE_BUS_PROPERTY_APPEND_ENUM(bus_job_append_type, job_type, JobType); static int bus_job_append_unit(DBusMessageIter *i, const char *property, void *data) { Job *j = data; DBusMessageIter sub; _cleanup_free_ char *p = NULL; assert(i); assert(property); assert(j); if (!dbus_message_iter_open_container(i, DBUS_TYPE_STRUCT, NULL, &sub)) return -ENOMEM; p = unit_dbus_path(j->unit); if (!p) return -ENOMEM; if (!dbus_message_iter_append_basic(&sub, DBUS_TYPE_STRING, &j->unit->id) || !dbus_message_iter_append_basic(&sub, DBUS_TYPE_OBJECT_PATH, &p)) { return -ENOMEM; } if (!dbus_message_iter_close_container(i, &sub)) return -ENOMEM; return 0; } static const BusProperty bus_job_properties[] = { { "Id", bus_property_append_uint32, "u", offsetof(Job, id) }, { "State", bus_job_append_state, "s", offsetof(Job, state) }, { "JobType", bus_job_append_type, "s", offsetof(Job, type) }, { "Unit", bus_job_append_unit, "(so)", 0 }, { NULL, } }; static DBusHandlerResult bus_job_message_dispatch(Job *j, DBusConnection *connection, DBusMessage *message) { _cleanup_dbus_message_unref_ DBusMessage *reply = NULL; if (dbus_message_is_method_call(message, "org.freedesktop.systemd1.Job", "Cancel")) { SELINUX_UNIT_ACCESS_CHECK(j->unit, connection, message, "stop"); job_finish_and_invalidate(j, JOB_CANCELED, true); reply = dbus_message_new_method_return(message); if (!reply) return DBUS_HANDLER_RESULT_NEED_MEMORY; } else { const BusBoundProperties bps[] = { { "org.freedesktop.systemd1.Job", bus_job_properties, j }, { NULL, } }; SELINUX_UNIT_ACCESS_CHECK(j->unit, connection, message, "status"); return bus_default_message_handler(connection, message, INTROSPECTION, INTERFACES_LIST, bps); } if (!bus_maybe_send_reply(connection, message, reply)) return DBUS_HANDLER_RESULT_NEED_MEMORY; return DBUS_HANDLER_RESULT_HANDLED; } static DBusHandlerResult bus_job_message_handler(DBusConnection *connection, DBusMessage *message, void *data) { Manager *m = data; Job *j; int r; _cleanup_dbus_message_unref_ DBusMessage *reply = NULL; assert(connection); assert(message); assert(m); if (streq(dbus_message_get_path(message), "/org/freedesktop/systemd1/job")) { /* Be nice to gdbus and return introspection data for our mid-level paths */ if (dbus_message_is_method_call(message, "org.freedesktop.DBus.Introspectable", "Introspect")) { _cleanup_free_ char *introspection = NULL; FILE *f; Iterator i; size_t size; SELINUX_ACCESS_CHECK(connection, message, "status"); reply = dbus_message_new_method_return(message); if (!reply) goto oom; /* We roll our own introspection code here, instead of * relying on bus_default_message_handler() because we * need to generate our introspection string * dynamically. */ f = open_memstream(&introspection, &size); if (!f) goto oom; fputs(DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE "<node>\n", f); fputs(BUS_INTROSPECTABLE_INTERFACE, f); fputs(BUS_PEER_INTERFACE, f); HASHMAP_FOREACH(j, m->jobs, i) fprintf(f, "<node name=\"job/%lu\"/>", (unsigned long) j->id); fputs("</node>\n", f); if (ferror(f)) { fclose(f); goto oom; } fclose(f); if (!introspection) goto oom; if (!dbus_message_append_args(reply, DBUS_TYPE_STRING, &introspection, DBUS_TYPE_INVALID)) { goto oom; } if (!bus_maybe_send_reply(connection, message, reply)) goto oom; return DBUS_HANDLER_RESULT_HANDLED; } return DBUS_HANDLER_RESULT_NOT_YET_HANDLED; } r = manager_get_job_from_dbus_path(m, dbus_message_get_path(message), &j); if (r == -ENOMEM) goto oom; if (r == -ENOENT) { DBusError e; dbus_error_init(&e); dbus_set_error_const(&e, DBUS_ERROR_UNKNOWN_OBJECT, "Unknown job"); return bus_send_error_reply(connection, message, &e, r); } if (r < 0) return bus_send_error_reply(connection, message, NULL, r); return bus_job_message_dispatch(j, connection, message); oom: return DBUS_HANDLER_RESULT_NEED_MEMORY; } const DBusObjectPathVTable bus_job_vtable = { .message_function = bus_job_message_handler }; static int job_send_message(Job *j, DBusMessage* (*new_message)(Job *j)) { _cleanup_dbus_message_unref_ DBusMessage *m = NULL; int r; assert(j); assert(new_message); if (bus_has_subscriber(j->manager) || j->forgot_bus_clients) { m = new_message(j); if (!m) return -ENOMEM; r = bus_broadcast(j->manager, m); if (r < 0) return r; } else { /* If nobody is subscribed, we just send the message * to the client(s) which created the job */ JobBusClient *cl; assert(j->bus_client_list); LIST_FOREACH(client, cl, j->bus_client_list) { assert(cl->bus); m = new_message(j); if (!m) return -ENOMEM; if (!dbus_message_set_destination(m, cl->name)) return -ENOMEM; if (!dbus_connection_send(cl->bus, m, NULL)) return -ENOMEM; dbus_message_unref(m); m = NULL; } } return 0; } static DBusMessage* new_change_signal_message(Job *j) { _cleanup_free_ char *p = NULL; DBusMessage *m; p = job_dbus_path(j); if (!p) return NULL; if (j->sent_dbus_new_signal) { /* Send a properties changed signal */ m = bus_properties_changed_new(p, "org.freedesktop.systemd1.Job", INVALIDATING_PROPERTIES); if (!m) return NULL; } else { /* Send a new signal */ m = dbus_message_new_signal("/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager", "JobNew"); if (!m) return NULL; if (!dbus_message_append_args(m, DBUS_TYPE_UINT32, &j->id, DBUS_TYPE_OBJECT_PATH, &p, DBUS_TYPE_STRING, &j->unit->id, DBUS_TYPE_INVALID)) { dbus_message_unref(m); return NULL; } } return m; } static DBusMessage* new_removed_signal_message(Job *j) { _cleanup_free_ char *p = NULL; DBusMessage *m; const char *r; p = job_dbus_path(j); if (!p) return NULL; m = dbus_message_new_signal("/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager", "JobRemoved"); if (!m) return NULL; r = job_result_to_string(j->result); if (!dbus_message_append_args(m, DBUS_TYPE_UINT32, &j->id, DBUS_TYPE_OBJECT_PATH, &p, DBUS_TYPE_STRING, &j->unit->id, DBUS_TYPE_STRING, &r, DBUS_TYPE_INVALID)) { dbus_message_unref(m); return NULL; } return m; } void bus_job_send_change_signal(Job *j) { assert(j); if (j->in_dbus_queue) { LIST_REMOVE(Job, dbus_queue, j->manager->dbus_job_queue, j); j->in_dbus_queue = false; } if (!bus_has_subscriber(j->manager) && !j->bus_client_list && !j->forgot_bus_clients) { j->sent_dbus_new_signal = true; return; } if (job_send_message(j, new_change_signal_message) < 0) goto oom; j->sent_dbus_new_signal = true; return; oom: log_error("Failed to allocate job change signal."); } void bus_job_send_removed_signal(Job *j) { assert(j); if (!bus_has_subscriber(j->manager) && !j->bus_client_list && !j->forgot_bus_clients) return; if (!j->sent_dbus_new_signal) bus_job_send_change_signal(j); if (job_send_message(j, new_removed_signal_message) < 0) goto oom; return; oom: log_error("Failed to allocate job remove signal."); }