sd-bus: suppress installing local bus matches server side

Matches that can only match against messages from the
org.freedesktop.DBus.Local service (or the local interfaces or path)
should never be installed server side, suppress them hence.

Similar, on kdbus matches that can only match driver messages shouldn't
be passed to the kernel.

1 files changed, 16 insertions, 0 deletions

diff --git a/src/libsystemd/sd-bus/test-bus-match.c b/src/libsystemd/sd-bus/test-bus-match.c
index 40c67046d..a1687b1c7 100644
--- a/src/libsystemd/sd-bus/test-bus-match.c
+++ b/src/libsystemd/sd-bus/test-bus-match.c
@@ -77,6 +77,15 @@ static int match_add(sd_bus_slot *slots, struct bus_match_node *root, const char
         return r;
 }
 
+static void test_match_scope(const char *match, enum bus_match_scope scope) {
+        struct bus_match_component *components = NULL;
+        unsigned n_components = 0;
+
+        assert_se(bus_match_parse(match, &components, &n_components) >= 0);
+        assert_se(bus_match_get_scope(components, n_components) == scope);
+        bus_match_parse_free(components, n_components);
+}
+
 int main(int argc, char *argv[]) {
         struct bus_match_node root = {
                 .type = BUS_MATCH_ROOT,
@@ -142,5 +151,12 @@ int main(int argc, char *argv[]) {
 
         bus_match_free(&root);
 
+        test_match_scope("interface='foobar'", BUS_MATCH_GENERIC);
+        test_match_scope("", BUS_MATCH_GENERIC);
+        test_match_scope("interface='org.freedesktop.DBus.Local'", BUS_MATCH_LOCAL);
+        test_match_scope("sender='org.freedesktop.DBus.Local'", BUS_MATCH_LOCAL);
+        test_match_scope("member='gurke',path='/org/freedesktop/DBus/Local'", BUS_MATCH_LOCAL);
+        test_match_scope("arg2='piep',sender='org.freedesktop.DBus',member='waldo'", BUS_MATCH_DRIVER);
+
         return 0;
 }