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add org.freedesktop.DBus.Properies.Set method 

The patch adds framework for processing Set requests on properties
and as first consumers allows setting of LogTarget and LogLevel on
interface org.freedesktop.systemd1.Manager of org.freedesktop.systemd1.

The code should be generic enough to allow processing of any
property on other objects and interfaces as well.

No systemctl visible interface is added so far. The LogTarget and
LogLevel are meant for debugging in the first place; user interface
can be added if other usage emerge.

Set on systemwide systemd is restricted to root; I am not sure
how session level access is controlled.
This commit is contained in:
Andrey Borzenkov 2011-03-06 19:17:02 +03:00 committed by Lennart Poettering
parent b4353094e5
commit c826cda421
3 changed files with 87 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

32
src/dbus-manager.c
View File

@ -156,8 +156,8 @@
" <property name=\"InitRDTimestamp\" type=\"t\" access=\"read\"/>\n" \
" <property name=\"StartupTimestamp\" type=\"t\" access=\"read\"/>\n" \
" <property name=\"FinishTimestamp\" type=\"t\" access=\"read\"/>\n" \
" <property name=\"LogLevel\" type=\"s\" access=\"read\"/>\n" \
" <property name=\"LogTarget\" type=\"s\" access=\"read\"/>\n" \
" <property name=\"LogLevel\" type=\"s\" access=\"readwrite\"/>\n" \
" <property name=\"LogTarget\" type=\"s\" access=\"readwrite\"/>\n" \
" <property name=\"NNames\" type=\"u\" access=\"read\"/>\n" \
" <property name=\"NJobs\" type=\"u\" access=\"read\"/>\n" \
" <property name=\"NInstalledJobs\" type=\"u\" access=\"read\"/>\n" \
@ -252,6 +252,18 @@ static int bus_manager_append_log_target(Manager *m, DBusMessageIter *i, const c
return 0;
}
static int bus_manager_set_log_target(Manager *m, DBusMessageIter *i, const char *property) {
const char *t;
assert(m);
assert(i);
assert(property);
dbus_message_iter_get_basic(i, &t);
return log_set_target_from_string(t);
}
static int bus_manager_append_log_level(Manager *m, DBusMessageIter *i, const char *property, void *data) {
const char *t;
@ -267,6 +279,18 @@ static int bus_manager_append_log_level(Manager *m, DBusMessageIter *i, const ch
return 0;
}
static int bus_manager_set_log_level(Manager *m, DBusMessageIter *i, const char *property) {
const char *t;
assert(m);
assert(i);
assert(property);
dbus_message_iter_get_basic(i, &t);
return log_set_max_level_from_string(t);
}
static int bus_manager_append_n_names(Manager *m, DBusMessageIter *i, const char *property, void *data) {
uint32_t u;
@ -341,8 +365,8 @@ static DBusHandlerResult bus_manager_message_handler(DBusConnection *connection,
{ "org.freedesktop.systemd1.Manager", "InitRDTimestamp", bus_property_append_uint64, "t", &m->initrd_timestamp.realtime },
{ "org.freedesktop.systemd1.Manager", "StartupTimestamp", bus_property_append_uint64, "t", &m->startup_timestamp.realtime },
{ "org.freedesktop.systemd1.Manager", "FinishTimestamp", bus_property_append_uint64, "t", &m->finish_timestamp.realtime },
{ "org.freedesktop.systemd1.Manager", "LogLevel", bus_manager_append_log_level, "s", NULL },
{ "org.freedesktop.systemd1.Manager", "LogTarget", bus_manager_append_log_target, "s", NULL },
{ "org.freedesktop.systemd1.Manager", "LogLevel", bus_manager_append_log_level, "s", NULL, bus_manager_set_log_level},
{ "org.freedesktop.systemd1.Manager", "LogTarget", bus_manager_append_log_target, "s", NULL, bus_manager_set_log_target},
{ "org.freedesktop.systemd1.Manager", "NNames", bus_manager_append_n_names, "u", NULL },
{ "org.freedesktop.systemd1.Manager", "NJobs", bus_manager_append_n_jobs, "u", NULL },
{ "org.freedesktop.systemd1.Manager", "NInstalledJobs",bus_property_append_uint32, "u", &m->n_installed_jobs },

52
src/dbus.c
View File

@ -1316,6 +1316,58 @@ DBusHandlerResult bus_default_message_handler(Manager *m, DBusConnection *c, DBu
if (!dbus_message_iter_close_container(&iter, &sub))
goto oom;
} else if (dbus_message_is_method_call(message, "org.freedesktop.DBus.Properties", "Set") && properties) {
const char *interface, *property;
DBusMessageIter iter;
const BusProperty *p;
if (!dbus_message_iter_init(message, &iter) ||
dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_STRING)
return bus_send_error_reply(m, c, message, NULL, -EINVAL);
dbus_message_iter_get_basic(&iter, &interface);
if (!dbus_message_iter_next(&iter) ||
dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_STRING)
return bus_send_error_reply(m, c, message, NULL, -EINVAL);
dbus_message_iter_get_basic(&iter, &property);
if (!dbus_message_iter_next(&iter) ||
dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_VARIANT ||
dbus_message_iter_has_next(&iter))
return bus_send_error_reply(m, c, message, NULL, -EINVAL);
for (p = properties; p->property; p++)
if (streq(p->interface, interface) && streq(p->property, property))
break;
if (p->set) {
DBusMessageIter sub;
char *sig;
dbus_message_iter_recurse(&iter, &sub);
if (!(sig = dbus_message_iter_get_signature(&sub)))
goto oom;
if (!streq(sig, p->signature)) {
dbus_free(sig);
return bus_send_error_reply(m, c, message, NULL, -EINVAL);
}
dbus_free(sig);
if ((r = p->set(m, &sub, property)) < 0) {
if (r == -ENOMEM)
goto oom;
return bus_send_error_reply(m, c, message, NULL, r);
}
if (!(reply = dbus_message_new_method_return(message)))
goto oom;
} else
return bus_send_error_reply(m, c, message, NULL, -EINVAL);
}
if (reply) {

7
src/dbus.h
View File

@ -27,6 +27,7 @@
#include "manager.h"
typedef int (*BusPropertyCallback)(Manager *m, DBusMessageIter *iter, const char *property, void *data);
typedef int (*BusPropertySetCallback)(Manager *m, DBusMessageIter *iter, const char *property);
typedef struct BusProperty {
const char *interface; /* interface of the property */
@ -34,6 +35,7 @@ typedef struct BusProperty {
BusPropertyCallback append; /* Function that is called to serialize this property */
const char *signature;
const void *data; /* The data of this property */
BusPropertySetCallback set; /* Function that is called to set this property */
} BusProperty;
#define BUS_PROPERTIES_INTERFACE \
@ -47,6 +49,11 @@ typedef struct BusProperty {
" <arg name=\"interface\" direction=\"in\" type=\"s\"/>\n" \
" <arg name=\"properties\" direction=\"out\" type=\"a{sv}\"/>\n" \
" </method>\n" \
" <method name=\"Set\">\n" \
" <arg name=\"interface\" direction=\"in\" type=\"s\"/>\n" \
" <arg name=\"property\" direction=\"in\" type=\"s\"/>\n" \
" <arg name=\"value\" direction=\"in\" type=\"v\"/>\n" \
" </method>\n" \
" <signal name=\"PropertiesChanged\">\n" \
" <arg type=\"s\" name=\"interface\"/>\n" \
" <arg type=\"a{sv}\" name=\"changed_properties\"/>\n" \