bus: don't fail if GetAll() is used to get properties of the built-in interfaces

[elogind.git] / src / libsystemd-bus / bus-objects.c

diff --git a/src/libsystemd-bus/bus-objects.c b/src/libsystemd-bus/bus-objects.c
index 4091490c5e7d62feb816285cb25e58584943f094..aa0be37a9de8061d918e9bbb258c651cd0d252f2 100644 (file)
--- a/src/libsystemd-bus/bus-objects.c
+++ b/src/libsystemd-bus/bus-objects.c
@@ -27,6 +27,7 @@
 #include "bus-signature.h"
 #include "bus-introspect.h"
 #include "bus-objects.h"
+#include "bus-util.h"
 
 static int node_vtable_get_userdata(
                 sd_bus *bus,
@@ -275,13 +276,13 @@ static int method_callbacks_run(
         if (r < 0)
                 return r;
 
-        r = sd_bus_message_get_signature(m, true, &signature);
-        if (r < 0)
-                return r;
+        signature = sd_bus_message_get_signature(m, true);
+        if (!signature)
+                return -EINVAL;
 
         if (!streq(strempty(c->vtable->x.method.signature), signature)) {
                 r = sd_bus_reply_method_errorf(bus, m,
-                                               "org.freedesktop.DBus.Error.InvalidArgs",
+                                               SD_BUS_ERROR_INVALID_ARGS,
                                                "Invalid arguments '%s' to call %s:%s, expecting '%s'.",
                                                signature, c->interface, c->member, strempty(c->vtable->x.method.signature));
                 if (r < 0)
@@ -312,7 +313,7 @@ static int invoke_property_get(
                 void *userdata) {
 
         int r;
-        void *p;
+        const void *p;
 
         assert(bus);
         assert(v);
@@ -332,9 +333,13 @@ static int invoke_property_get(
         switch (v->x.property.signature[0]) {
 
         case SD_BUS_TYPE_STRING:
-        case SD_BUS_TYPE_OBJECT_PATH:
         case SD_BUS_TYPE_SIGNATURE:
+                p = strempty(*(char**) userdata);
+                break;
+
+        case SD_BUS_TYPE_OBJECT_PATH:
                 p = *(char**) userdata;
+                assert(p);
                 break;
 
         default:
@@ -475,7 +480,7 @@ static int property_get_set_callbacks_run(
 
         } else {
                 if (c->vtable->type != _SD_BUS_VTABLE_WRITABLE_PROPERTY)
-                        sd_bus_error_setf(&error, "org.freedesktop.DBus.Error.PropertyReadOnly", "Property '%s' is not writable.", c->member);
+                        sd_bus_error_setf(&error, SD_BUS_ERROR_PROPERTY_READ_ONLY, "Property '%s' is not writable.", c->member);
                 else  {
                         /* Avoid that we call the set routine more
                          * than once if the processing of this message
@@ -580,7 +585,7 @@ static int property_get_all_callbacks_run(
 
         _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
         struct node_vtable *c;
-        bool found_interface = false;
+        bool found_interface;
         int r;
 
         assert(bus);
@@ -595,6 +600,11 @@ static int property_get_all_callbacks_run(
         if (r < 0)
                 return r;
 
+        found_interface =
+                streq(iface, "org.freedesktop.DBus.Properties") ||
+                streq(iface, "org.freedesktop.DBus.Peer") ||
+                streq(iface, "org.freedesktop.DBus.Introspectable");
+
         LIST_FOREACH(vtables, c, first) {
                 _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
                 void *u;
@@ -634,7 +644,7 @@ static int property_get_all_callbacks_run(
         if (!found_interface) {
                 r = sd_bus_reply_method_errorf(
                                 bus, m,
-                                "org.freedesktop.DBus.Error.UnknownInterface",
+                                SD_BUS_ERROR_UNKNOWN_INTERFACE,
                                 "Unknown interface '%s'.", iface);
                 if (r < 0)
                         return r;
@@ -1164,7 +1174,7 @@ int bus_process_object(sd_bus *bus, sd_bus_message *m) {
         assert(bus);
         assert(m);
 
-        if (m->header->type != SD_BUS_MESSAGE_TYPE_METHOD_CALL)
+        if (m->header->type != SD_BUS_MESSAGE_METHOD_CALL)
                 return 0;
 
         if (!m->path)
@@ -1203,12 +1213,12 @@ int bus_process_object(sd_bus *bus, sd_bus_message *m) {
             sd_bus_message_is_method_call(m, "org.freedesktop.DBus.Properties", "Set"))
                 r = sd_bus_reply_method_errorf(
                                 bus, m,
-                                "org.freedesktop.DBus.Error.UnknownProperty",
+                                SD_BUS_ERROR_UNKNOWN_PROPERTY,
                                 "Unknown property or interface.");
         else
                 r = sd_bus_reply_method_errorf(
                                 bus, m,
-                                "org.freedesktop.DBus.Error.UnknownMethod",
+                                SD_BUS_ERROR_UNKNOWN_METHOD,
                                 "Unknown method '%s' or interface '%s'.", m->member, m->interface);
 
         if (r < 0)
@@ -1875,8 +1885,6 @@ static int emit_properties_changed_on_interface(
                 r = invoke_property_get(bus, v->vtable, m->path, interface, *property, m, &error, vtable_property_convert_userdata(v->vtable, u));
                 if (r < 0)
                         return r;
-                if (sd_bus_error_is_set(&error))
-                        return bus_error_to_errno(&error);
                 if (bus->nodes_modified)
                         return 0;
 
@@ -1973,8 +1981,7 @@ int sd_bus_emit_properties_changed(
                 const char *interface,
                 const char *name, ...)  {
 
-        _cleanup_strv_free_ char **names = NULL;
-        va_list ap;
+        char **names;
 
         assert_return(bus, -EINVAL);
         assert_return(object_path_is_valid(path), -EINVAL);
@@ -1985,12 +1992,7 @@ int sd_bus_emit_properties_changed(
         if (!name)
                 return 0;
 
-        va_start(ap, name);
-        names = strv_new_ap(name, ap);
-        va_end(ap);
-
-        if (!names)
-                return -ENOMEM;
+        names = strv_from_stdarg_alloca(name);
 
         return sd_bus_emit_properties_changed_strv(bus, path, interface, names);
 }
@@ -2047,8 +2049,6 @@ static int interfaces_added_append_one_prefix(
         r = vtable_append_all_properties(bus, m,path, c, u, &error);
         if (r < 0)
                 return r;
-        if (sd_bus_error_is_set(&error))
-                return bus_error_to_errno(&error);
         if (bus->nodes_modified)
                 return 0;
 
@@ -2156,20 +2156,14 @@ int sd_bus_emit_interfaces_added_strv(sd_bus *bus, const char *path, char **inte
 }
 
 int sd_bus_emit_interfaces_added(sd_bus *bus, const char *path, const char *interface, ...) {
-        _cleanup_strv_free_ char **interfaces = NULL;
-        va_list ap;
+        char **interfaces;
 
         assert_return(bus, -EINVAL);
         assert_return(object_path_is_valid(path), -EINVAL);
         assert_return(BUS_IS_OPEN(bus->state), -ENOTCONN);
         assert_return(!bus_pid_changed(bus), -ECHILD);
 
-        va_start(ap, interface);
-        interfaces = strv_new_ap(interface, ap);
-        va_end(ap);
-
-        if (!interfaces)
-                return -ENOMEM;
+        interfaces = strv_from_stdarg_alloca(interface);
 
         return sd_bus_emit_interfaces_added_strv(bus, path, interfaces);
 }
@@ -2202,20 +2196,14 @@ int sd_bus_emit_interfaces_removed_strv(sd_bus *bus, const char *path, char **in
 }
 
 int sd_bus_emit_interfaces_removed(sd_bus *bus, const char *path, const char *interface, ...) {
-        _cleanup_strv_free_ char **interfaces = NULL;
-        va_list ap;
+        char **interfaces;
 
         assert_return(bus, -EINVAL);
         assert_return(object_path_is_valid(path), -EINVAL);
         assert_return(BUS_IS_OPEN(bus->state), -ENOTCONN);
         assert_return(!bus_pid_changed(bus), -ECHILD);
 
-        va_start(ap, interface);
-        interfaces = strv_new_ap(interface, ap);
-        va_end(ap);
-
-        if (!interfaces)
-                return -ENOMEM;
+        interfaces = strv_from_stdarg_alloca(interface);
 
         return sd_bus_emit_interfaces_removed_strv(bus, path, interfaces);
 }