add basic (and not very useful) D-Bus support

1 files changed, 133 insertions, 0 deletions

diff --git a/dbus-unit.c b/dbus-unit.c
new file mode 100644
index 0000000000..5988f96102
--- /dev/null
+++ b/dbus-unit.c
@@ -0,0 +1,133 @@
+/*-*- Mode: C; c-basic-offset: 8 -*-*/
+
+#include <errno.h>
+
+#include "dbus.h"
+#include "log.h"
+
+static const char introspection[] =
+        DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE
+        "<node>"
+        " <!-- you suck -->"
+        " <interface name=\"org.freedesktop.systemd1.Unit\">"
+        "  <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\"/>"
+        " </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, &u))
+                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 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 },
+                { NULL, NULL, NULL, NULL, NULL }
+        };
+
+        return bus_default_message_handler(u->meta.manager, message, introspection, properties);
+}
+
+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
+};