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Systemd/src/core/dbus-job.c

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/*-*- 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"
#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;
if (!(p = unit_dbus_path(j->unit)))
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) {
DBusMessage *reply = NULL;
if (dbus_message_is_method_call(message, "org.freedesktop.systemd1.Job", "Cancel")) {
if (!(reply = dbus_message_new_method_return(message)))
goto oom;
job_finish_and_invalidate(j, JOB_CANCELED);
} else {
const BusBoundProperties bps[] = {
{ "org.freedesktop.systemd1.Job", bus_job_properties, j },
{ NULL, }
};
return bus_default_message_handler(connection, message, INTROSPECTION, INTERFACES_LIST, bps);
}
if (reply) {
if (!dbus_connection_send(connection, reply, NULL))
goto oom;
dbus_message_unref(reply);
}
return DBUS_HANDLER_RESULT_HANDLED;
oom:
if (reply)
dbus_message_unref(reply);
return DBUS_HANDLER_RESULT_NEED_MEMORY;
}
static DBusHandlerResult bus_job_message_handler(DBusConnection *connection, DBusMessage *message, void *data) {
Manager *m = data;
Job *j;
int r;
DBusMessage *reply;
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;
if (!(reply = dbus_message_new_method_return(message)))
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. */
if (!(f = open_memstream(&introspection, &size)))
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 (!dbus_connection_send(connection, reply, NULL))
goto oom;
dbus_message_unref(reply);
return DBUS_HANDLER_RESULT_HANDLED;
}
return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
}
if ((r = manager_get_job_from_dbus_path(m, dbus_message_get_path(message), &j)) < 0) {
if (r == -ENOMEM)
return DBUS_HANDLER_RESULT_NEED_MEMORY;
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);
}
return bus_send_error_reply(connection, message, NULL, r);
}
return bus_job_message_dispatch(j, connection, message);
oom:
if (reply)
dbus_message_unref(reply);
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 *m) {
int r;
assert(j);
assert(m);
if (bus_has_subscriber(j->manager)) {
if ((r = bus_broadcast(j->manager, m)) < 0)
return r;
} else if (j->bus_client) {
/* If nobody is subscribed, we just send the message
* to the client which created the job */
assert(j->bus);
if (!dbus_message_set_destination(m, j->bus_client))
return -ENOMEM;
if (!dbus_connection_send(j->bus, m, NULL))
return -ENOMEM;
}
return 0;
}
void bus_job_send_change_signal(Job *j) {
char *p = NULL;
DBusMessage *m = NULL;
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) {
j->sent_dbus_new_signal = true;
return;
}
if (!(p = job_dbus_path(j)))
goto oom;
if (j->sent_dbus_new_signal) {
/* Send a properties changed signal */
if (!(m = bus_properties_changed_new(p, "org.freedesktop.systemd1.Job", INVALIDATING_PROPERTIES)))
goto oom;
} else {
/* Send a new signal */
if (!(m = dbus_message_new_signal("/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager", "JobNew")))
goto oom;
if (!dbus_message_append_args(m,
DBUS_TYPE_UINT32, &j->id,
DBUS_TYPE_OBJECT_PATH, &p,
DBUS_TYPE_INVALID))
goto oom;
}
if (job_send_message(j, m) < 0)
goto oom;
free(p);
dbus_message_unref(m);
j->sent_dbus_new_signal = true;
return;
oom:
free(p);
if (m)
dbus_message_unref(m);
log_error("Failed to allocate job change signal.");
}
void bus_job_send_removed_signal(Job *j) {
char *p = NULL;
DBusMessage *m = NULL;
const char *r;
assert(j);
if (!bus_has_subscriber(j->manager) && !j->bus_client)
return;
if (!j->sent_dbus_new_signal)
bus_job_send_change_signal(j);
if (!(p = job_dbus_path(j)))
goto oom;
if (!(m = dbus_message_new_signal("/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager", "JobRemoved")))
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, &r,
DBUS_TYPE_INVALID))
goto oom;
if (job_send_message(j, m) < 0)
goto oom;
free(p);
dbus_message_unref(m);
return;
oom:
free(p);
if (m)
dbus_message_unref(m);
log_error("Failed to allocate job remove signal.");
}
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