diff options
Diffstat (limited to 'src/core/dbus-job.c')
| -rw-r--r-- | src/core/dbus-job.c | 373 |
1 files changed, 373 insertions, 0 deletions
diff --git a/src/core/dbus-job.c b/src/core/dbus-job.c new file mode 100644 index 0000000000..98ccfa62ec --- /dev/null +++ b/src/core/dbus-job.c @@ -0,0 +1,373 @@ +/*-*- 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; + char *p; + + 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)) { + free(p); + return -ENOMEM; + } + + free(p); + + 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")) { + 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); + free(introspection); + goto oom; + } + + fclose(f); + + if (!introspection) + goto oom; + + if (!dbus_message_append_args(reply, DBUS_TYPE_STRING, &introspection, DBUS_TYPE_INVALID)) { + free(introspection); + goto oom; + } + + free(introspection); + + 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) { + DBusMessage *m = NULL; + char *p = NULL; + + p = job_dbus_path(j); + if (!p) + goto oom; + + 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) + goto oom; + + } else { + /* Send a new signal */ + + m = dbus_message_new_signal("/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager", "JobNew"); + if (!m) + goto oom; + + 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)) + goto oom; + } + + return m; + +oom: + if (m) + dbus_message_unref(m); + free(p); + return NULL; +} + +static DBusMessage* new_removed_signal_message(Job *j) { + DBusMessage *m = NULL; + char *p = NULL; + const char *r; + + p = job_dbus_path(j); + if (!p) + goto oom; + + m = dbus_message_new_signal("/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager", "JobRemoved"); + if (!m) + goto oom; + + 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)) + goto oom; + + return m; + +oom: + if (m) + dbus_message_unref(m); + free(p); + return NULL; +} + +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."); +} |