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-rw-r--r--src/shared/bus-object.c177
1 files changed, 177 insertions, 0 deletions
diff --git a/src/shared/bus-object.c b/src/shared/bus-object.c
new file mode 100644
index 0000000..4ed5215
--- /dev/null
+++ b/src/shared/bus-object.c
@@ -0,0 +1,177 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include "bus-introspect.h"
+#include "bus-object.h"
+#include "macro.h"
+#include "string-util.h"
+#include "strv.h"
+
+int bus_add_implementation(sd_bus *bus, const BusObjectImplementation *impl, void *userdata) {
+ int r;
+
+ log_debug("Registering bus object implementation for path=%s iface=%s", impl->path, impl->interface);
+
+ for (const sd_bus_vtable **p = impl->vtables; p && *p; p++) {
+ r = sd_bus_add_object_vtable(bus, NULL,
+ impl->path,
+ impl->interface,
+ *p,
+ userdata);
+ if (r < 0)
+ return log_error_errno(r, "Failed to register bus path %s with interface %s: %m",
+ impl->path,
+ impl->interface);
+ }
+
+ for (const BusObjectVtablePair *p = impl->fallback_vtables; p && p->vtable; p++) {
+ r = sd_bus_add_fallback_vtable(bus, NULL,
+ impl->path,
+ impl->interface,
+ p->vtable,
+ p->object_find,
+ userdata);
+ if (r < 0)
+ return log_error_errno(r, "Failed to register bus path %s with interface %s: %m",
+ impl->path,
+ impl->interface);
+ }
+
+ if (impl->node_enumerator) {
+ r = sd_bus_add_node_enumerator(bus, NULL,
+ impl->path,
+ impl->node_enumerator,
+ userdata);
+ if (r < 0)
+ return log_error_errno(r, "Failed to add node enumerator for %s: %m",
+ impl->path);
+ }
+
+ if (impl->manager) {
+ r = sd_bus_add_object_manager(bus, NULL, impl->path);
+ if (r < 0)
+ return log_error_errno(r, "Failed to add object manager for %s: %m", impl->path);
+ }
+
+ for (size_t i = 0; impl->children && impl->children[i]; i++) {
+ r = bus_add_implementation(bus, impl->children[i], userdata);
+ if (r < 0)
+ return r;
+ }
+
+ return 0;
+}
+
+static const BusObjectImplementation* find_implementation(
+ const char *pattern,
+ const BusObjectImplementation* const* bus_objects) {
+
+ for (size_t i = 0; bus_objects && bus_objects[i]; i++) {
+ const BusObjectImplementation *impl = bus_objects[i];
+
+ if (STR_IN_SET(pattern, impl->path, impl->interface))
+ return impl;
+
+ impl = find_implementation(pattern, impl->children);
+ if (impl)
+ return impl;
+ }
+
+ return NULL;
+}
+
+static int bus_introspect_implementation(
+ struct introspect *intro,
+ const BusObjectImplementation *impl) {
+ int r;
+
+ for (const sd_bus_vtable **p = impl->vtables; p && *p; p++) {
+ r = introspect_write_interface(intro, impl->interface, *p);
+ if (r < 0)
+ return log_error_errno(r, "Failed to write introspection data: %m");
+ }
+
+ for (const BusObjectVtablePair *p = impl->fallback_vtables; p && p->vtable; p++) {
+ r = introspect_write_interface(intro, impl->interface, p->vtable);
+ if (r < 0)
+ return log_error_errno(r, "Failed to write introspection data: %m");
+ }
+
+ return 0;
+}
+
+static void list_paths(
+ FILE *out,
+ const BusObjectImplementation* const* bus_objects) {
+
+ for (size_t i = 0; bus_objects[i]; i++) {
+ fprintf(out, "%s\t%s\n", bus_objects[i]->path, bus_objects[i]->interface);
+ if (bus_objects[i]->children)
+ list_paths(out, bus_objects[i]->children);
+ }
+}
+
+int bus_introspect_implementations(
+ FILE *out,
+ const char *pattern,
+ const BusObjectImplementation* const* bus_objects) {
+
+ const BusObjectImplementation *impl, *main_impl = NULL;
+ _cleanup_free_ char *s = NULL;
+ int r;
+
+ if (streq(pattern, "list")) {
+ list_paths(out, bus_objects);
+ return 0;
+ }
+
+ struct introspect intro = {};
+ bool is_interface = sd_bus_interface_name_is_valid(pattern);
+
+ impl = find_implementation(pattern, bus_objects);
+ if (!impl)
+ return log_error_errno(SYNTHETIC_ERRNO(ENOENT),
+ "%s %s not found",
+ is_interface ? "Interface" : "Object path",
+ pattern);
+
+ /* We use trusted=false here to get all the @org.freedesktop.systemd1.Privileged annotations. */
+ r = introspect_begin(&intro, false);
+ if (r < 0)
+ return log_error_errno(r, "Failed to write introspection data: %m");
+
+ r = introspect_write_default_interfaces(&intro, impl->manager);
+ if (r < 0)
+ return log_error_errno(r, "Failed to write introspection data: %m");
+
+ /* Check if there is a non-fallback path that applies to the given interface, also
+ * print it. This is useful in the case of units: o.fd.systemd1.Service is declared
+ * as a fallback vtable for o/fd/systemd1/unit, and we also want to print
+ * o.fd.systemd1.Unit, which is the non-fallback implementation. */
+ if (impl->fallback_vtables && is_interface)
+ main_impl = find_implementation(impl->path, bus_objects);
+
+ if (main_impl)
+ bus_introspect_implementation(&intro, main_impl);
+
+ if (impl != main_impl)
+ bus_introspect_implementation(&intro, impl);
+
+ _cleanup_ordered_set_free_ OrderedSet *nodes = NULL;
+
+ for (size_t i = 0; impl->children && impl->children[i]; i++) {
+ r = ordered_set_put_strdup(&nodes, impl->children[i]->path);
+ if (r < 0)
+ return log_oom();
+ }
+
+ r = introspect_write_child_nodes(&intro, nodes, impl->path);
+ if (r < 0)
+ return r;
+
+ r = introspect_finish(&intro, &s);
+ if (r < 0)
+ return log_error_errno(r, "Failed to write introspection data: %m");
+
+ fputs(s, out);
+ return 0;
+}