/*-*- Mode: C; c-basic-offset: 8 -*-*/ /*** 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 General Public License as published by the Free Software Foundation; either version 2 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 General Public License for more details. You should have received a copy of the GNU General Public License along with systemd; If not, see <http://www.gnu.org/licenses/>. ***/ #include <errno.h> #include "dbus.h" #include "log.h" static const char introspection[] = DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE "<node>" " <interface name=\"org.freedesktop.systemd1.Unit\">" " <method name=\"Start\">" " <arg name=\"mode\" type=\"s\" direction=\"in\"/>" " <arg name=\"job\" type=\"o\" direction=\"out\"/>" " </method>" " <method name=\"Stop\">" " <arg name=\"mode\" type=\"s\" direction=\"in\"/>" " <arg name=\"job\" type=\"o\" direction=\"out\"/>" " </method>" " <method name=\"Restart\">" " <arg name=\"mode\" type=\"s\" direction=\"in\"/>" " <arg name=\"job\" type=\"o\" direction=\"out\"/>" " </method>" " <method name=\"Reload\">" " <arg name=\"mode\" type=\"s\" direction=\"in\"/>" " <arg name=\"job\" type=\"o\" direction=\"out\"/>" " </method>" " <signal name=\"Changed\"/>" " <property name=\"Id\" type=\"s\" access=\"read\"/>" " <property name=\"Description\" type=\"s\" access=\"read\"/>" " <property name=\"LoadState\" type=\"s\" access=\"read\"/>" " <property name=\"ActiveState\" type=\"s\" access=\"read\"/>" " <property name=\"FragmentPath\" type=\"s\" access=\"read\"/>" " <property name=\"ActiveEnterTimestamp\" type=\"t\" access=\"read\"/>" " <property name=\"ActiveExitTimestamp\" type=\"t\" access=\"read\"/>" " <property name=\"CanReload\" type=\"b\" access=\"read\"/>" " <property name=\"CanStart\" type=\"b\" access=\"read\"/>" " <property name=\"Job\" type=\"(uo)\" access=\"read\"/>" " </interface>" BUS_PROPERTIES_INTERFACE BUS_INTROSPECTABLE_INTERFACE "</node>"; static int bus_unit_append_id(Manager *m, DBusMessageIter *i, const char *property, void *data) { Unit *u = data; const char *id; assert(m); assert(i); assert(property); assert(u); id = unit_id(u); if (!dbus_message_iter_append_basic(i, DBUS_TYPE_STRING, &id)) return -ENOMEM; return 0; } static int bus_unit_append_description(Manager *m, DBusMessageIter *i, const char *property, void *data) { Unit *u = data; const char *d; assert(m); assert(i); assert(property); assert(u); d = unit_description(u); if (!dbus_message_iter_append_basic(i, DBUS_TYPE_STRING, &d)) return -ENOMEM; return 0; } static int bus_unit_append_load_state(Manager *m, DBusMessageIter *i, const char *property, void *data) { Unit *u = data; const char *state; assert(m); assert(i); assert(property); assert(u); state = unit_load_state_to_string(u->meta.load_state); if (!dbus_message_iter_append_basic(i, DBUS_TYPE_STRING, &state)) return -ENOMEM; return 0; } static int bus_unit_append_active_state(Manager *m, DBusMessageIter *i, const char *property, void *data) { Unit *u = data; const char *state; assert(m); assert(i); assert(property); assert(u); state = unit_active_state_to_string(unit_active_state(u)); if (!dbus_message_iter_append_basic(i, DBUS_TYPE_STRING, &state)) return -ENOMEM; return 0; } static int bus_unit_append_can_reload(Manager *m, DBusMessageIter *i, const char *property, void *data) { Unit *u = data; dbus_bool_t b; assert(m); assert(i); assert(property); assert(u); b = unit_can_reload(u); if (!dbus_message_iter_append_basic(i, DBUS_TYPE_BOOLEAN, &b)) return -ENOMEM; return 0; } static int bus_unit_append_can_start(Manager *m, DBusMessageIter *i, const char *property, void *data) { Unit *u = data; dbus_bool_t b; assert(m); assert(i); assert(property); assert(u); b = unit_can_start(u); if (!dbus_message_iter_append_basic(i, DBUS_TYPE_BOOLEAN, &b)) return -ENOMEM; return 0; } static int bus_unit_append_job(Manager *m, DBusMessageIter *i, const char *property, void *data) { Unit *u = data; DBusMessageIter sub; char *p; assert(m); assert(i); assert(property); assert(u); if (!dbus_message_iter_open_container(i, DBUS_TYPE_STRUCT, NULL, &sub)) return -ENOMEM; if (u->meta.job) { if (!(p = job_dbus_path(u->meta.job))) return -ENOMEM; if (!dbus_message_iter_append_basic(&sub, DBUS_TYPE_UINT32, &u->meta.job->id) || !dbus_message_iter_append_basic(&sub, DBUS_TYPE_OBJECT_PATH, &p)) { free(p); return -ENOMEM; } } else { uint32_t id = 0; /* No job, so let's fill in some placeholder * data. Since we need to fill in a valid path we * simple point to ourselves. */ if (!(p = unit_dbus_path(u))) return -ENOMEM; if (!dbus_message_iter_append_basic(&sub, DBUS_TYPE_UINT32, &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 DBusHandlerResult bus_unit_message_dispatch(Unit *u, DBusMessage *message) { const BusProperty properties[] = { { "org.freedesktop.systemd1.Unit", "Id", bus_unit_append_id, "s", u }, { "org.freedesktop.systemd1.Unit", "Description", bus_unit_append_description, "s", u }, { "org.freedesktop.systemd1.Unit", "LoadState", bus_unit_append_load_state, "s", u }, { "org.freedesktop.systemd1.Unit", "ActiveState", bus_unit_append_active_state, "s", u }, { "org.freedesktop.systemd1.Unit", "FragmentPath", bus_property_append_string, "s", u->meta.fragment_path }, { "org.freedesktop.systemd1.Unit", "ActiveEnterTimestamp", bus_property_append_uint64, "t", &u->meta.active_enter_timestamp }, { "org.freedesktop.systemd1.Unit", "ActiveExitTimestamp", bus_property_append_uint64, "t", &u->meta.active_exit_timestamp }, { "org.freedesktop.systemd1.Unit", "CanReload", bus_unit_append_can_reload, "b", u }, { "org.freedesktop.systemd1.Unit", "CanStart", bus_unit_append_can_start, "b", u }, { "org.freedesktop.systemd1.Unit", "Job", bus_unit_append_job, "(uo)", u }, { NULL, NULL, NULL, NULL, NULL } }; DBusMessage *reply = NULL; Manager *m = u->meta.manager; DBusError error; JobType job_type = _JOB_TYPE_INVALID; dbus_error_init(&error); if (dbus_message_is_method_call(message, "org.freedesktop.systemd1.Unit", "Start")) job_type = JOB_START; else if (dbus_message_is_method_call(message, "org.freedesktop.systemd1.Unit", "Stop")) job_type = JOB_STOP; else if (dbus_message_is_method_call(message, "org.freedesktop.systemd1.Unit", "Reload")) job_type = JOB_RELOAD; else if (dbus_message_is_method_call(message, "org.freedesktop.systemd1.Unit", "Restart")) job_type = JOB_RESTART; else return bus_default_message_handler(u->meta.manager, message, introspection, properties); if (job_type != _JOB_TYPE_INVALID) { const char *smode; JobMode mode; Job *j; int r; char *path; if (!dbus_message_get_args( message, &error, DBUS_TYPE_STRING, &smode, DBUS_TYPE_INVALID)) return bus_send_error_reply(m, message, &error, -EINVAL); if ((mode = job_mode_from_string(smode)) == _JOB_MODE_INVALID) return bus_send_error_reply(m, message, NULL, -EINVAL); if ((r = manager_add_job(m, job_type, u, mode, true, &j)) < 0) return bus_send_error_reply(m, message, NULL, r); if (!(reply = dbus_message_new_method_return(message))) goto oom; if (!(path = job_dbus_path(j))) goto oom; if (!dbus_message_append_args( reply, DBUS_TYPE_OBJECT_PATH, &path, DBUS_TYPE_INVALID)) goto oom; } if (reply) { if (!dbus_connection_send(m->bus, reply, NULL)) goto oom; dbus_message_unref(reply); } return DBUS_HANDLER_RESULT_HANDLED; oom: if (reply) dbus_message_unref(reply); dbus_error_free(&error); return DBUS_HANDLER_RESULT_NEED_MEMORY; } static DBusHandlerResult bus_unit_message_handler(DBusConnection *connection, DBusMessage *message, void *data) { Manager *m = data; Unit *u; int r; assert(connection); assert(message); assert(m); log_debug("Got D-Bus request: %s.%s() on %s", dbus_message_get_interface(message), dbus_message_get_member(message), dbus_message_get_path(message)); if ((r = manager_get_unit_from_dbus_path(m, dbus_message_get_path(message), &u)) < 0) { if (r == -ENOMEM) return DBUS_HANDLER_RESULT_NEED_MEMORY; if (r == -ENOENT) return DBUS_HANDLER_RESULT_NOT_YET_HANDLED; return bus_send_error_reply(m, message, NULL, r); } return bus_unit_message_dispatch(u, message); } const DBusObjectPathVTable bus_unit_vtable = { .message_function = bus_unit_message_handler }; void bus_unit_send_change_signal(Unit *u) { char *p = NULL; DBusMessage *m = NULL; assert(u); assert(u->meta.in_dbus_queue); LIST_REMOVE(Meta, dbus_queue, u->meta.manager->dbus_unit_queue, &u->meta); u->meta.in_dbus_queue = false; if (set_isempty(u->meta.manager->subscribed)) return; if (!(p = unit_dbus_path(u))) goto oom; if (u->meta.sent_dbus_new_signal) { /* Send a change signal */ if (!(m = dbus_message_new_signal(p, "org.freedesktop.systemd1.Unit", "Changed"))) goto oom; } else { const char *id; /* Send a new signal */ if (!(m = dbus_message_new_signal("/org/freedesktop/systemd1", "org.freedesktop.systemd1", "UnitNew"))) goto oom; id = unit_id(u); if (!dbus_message_append_args(m, DBUS_TYPE_STRING, &id, DBUS_TYPE_OBJECT_PATH, &p, DBUS_TYPE_INVALID)) goto oom; } if (!dbus_connection_send(u->meta.manager->bus, m, NULL)) goto oom; free(p); dbus_message_unref(m); u->meta.sent_dbus_new_signal = true; return; oom: free(p); if (m) dbus_message_unref(m); log_error("Failed to allocate unit change/new signal."); } void bus_unit_send_removed_signal(Unit *u) { char *p = NULL; DBusMessage *m = NULL; const char *id; assert(u); if (set_isempty(u->meta.manager->subscribed) || !u->meta.sent_dbus_new_signal) return; if (!(p = unit_dbus_path(u))) goto oom; if (!(m = dbus_message_new_signal("/org/freedesktop/systemd1", "org.freedesktop.systemd1", "UnitRemoved"))) goto oom; id = unit_id(u); if (!dbus_message_append_args(m, DBUS_TYPE_STRING, &id, DBUS_TYPE_OBJECT_PATH, &p, DBUS_TYPE_INVALID)) goto oom; if (!dbus_connection_send(u->meta.manager->bus, m, NULL)) goto oom; free(p); dbus_message_unref(m); return; oom: free(p); if (m) dbus_message_unref(m); log_error("Failed to allocate unit remove signal."); }