X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=src%2Flibsystemd-bus%2Fsd-bus.c;h=cebb07319af1916875c5ff6a76c03421cc572661;hp=7ae32036bdec85a8dc9d7593547f6462923eed9c;hb=9db76355212de5eb7985829d352183d3bdfb56d5;hpb=c78196699d3d805b2237896a1d2b8efeec6068d0 diff --git a/src/libsystemd-bus/sd-bus.c b/src/libsystemd-bus/sd-bus.c index 7ae32036b..cebb07319 100644 --- a/src/libsystemd-bus/sd-bus.c +++ b/src/libsystemd-bus/sd-bus.c @@ -42,6 +42,8 @@ #include "bus-socket.h" #include "bus-kernel.h" #include "bus-control.h" +#include "bus-introspect.h" +#include "bus-signature.h" static int bus_poll(sd_bus *bus, bool need_more, uint64_t timeout_usec); @@ -57,9 +59,46 @@ static void bus_close_fds(sd_bus *b) { b->input_fd = b->output_fd = -1; } +static void bus_node_destroy(sd_bus *b, struct node *n) { + struct node_callback *c; + struct node_vtable *v; + struct node_enumerator *e; + + assert(b); + + if (!n) + return; + + while (n->child) + bus_node_destroy(b, n->child); + + while ((c = n->callbacks)) { + LIST_REMOVE(struct node_callback, callbacks, n->callbacks, c); + free(c); + } + + while ((v = n->vtables)) { + LIST_REMOVE(struct node_vtable, vtables, n->vtables, v); + free(v->interface); + free(v); + } + + while ((e = n->enumerators)) { + LIST_REMOVE(struct node_enumerator, enumerators, n->enumerators, e); + free(e); + } + + if (n->parent) + LIST_REMOVE(struct node, siblings, n->parent->child, n); + + assert_se(hashmap_remove(b->nodes, n->path) == n); + free(n->path); + free(n); +} + static void bus_free(sd_bus *b) { struct filter_callback *f; - struct object_callback *c; + struct node *n; unsigned i; assert(b); @@ -97,14 +136,16 @@ static void bus_free(sd_bus *b) { free(f); } - while ((c = hashmap_steal_first(b->object_callbacks))) { - free(c->path); - free(c); - } - - hashmap_free(b->object_callbacks); bus_match_free(&b->match_callbacks); + hashmap_free_free(b->vtable_methods); + hashmap_free_free(b->vtable_properties); + + while ((n = hashmap_first(b->nodes))) + bus_node_destroy(b, n); + + hashmap_free(b->nodes); + bus_kernel_flush_memfd(b); assert_se(pthread_mutex_destroy(&b->memfd_cache_mutex) == 0); @@ -1215,11 +1256,11 @@ static int dispatch_rqueue(sd_bus *bus, sd_bus_message **m) { if (r == 0) return ret; - r = 1; + ret = 1; } while (!z); *m = z; - return 1; + return ret; } int sd_bus_send(sd_bus *bus, sd_bus_message *m, uint64_t *serial) { @@ -1818,13 +1859,10 @@ static int process_builtin(sd_bus *bus, sd_bus_message *m) { r = sd_bus_message_append(reply, "s", sd_id128_to_string(id, sid)); } else { - _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; - - sd_bus_error_set(&error, - "org.freedesktop.DBus.Error.UnknownMethod", + r = sd_bus_message_new_method_errorf( + bus, m, &reply, + "org.freedesktop.DBus.Error.UnknownMethod", "Unknown method '%s' on interface '%s'.", m->member, m->interface); - - r = sd_bus_message_new_method_error(bus, m, &error, &reply); } if (r < 0) @@ -1837,669 +1875,2406 @@ static int process_builtin(sd_bus *bus, sd_bus_message *m) { return 1; } -static int process_object(sd_bus *bus, sd_bus_message *m) { - _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; - _cleanup_bus_message_unref_ sd_bus_message *reply = NULL; - struct object_callback *c; +static int node_vtable_get_userdata( + sd_bus *bus, + const char *path, + struct node_vtable *c, + void **userdata) { + + void *u; int r; - bool found = false; - size_t pl; assert(bus); - assert(m); - - if (m->header->type != SD_BUS_MESSAGE_TYPE_METHOD_CALL) - return 0; - - if (hashmap_isempty(bus->object_callbacks)) - return 0; + assert(path); + assert(c); - pl = strlen(m->path); - - do { - char p[pl+1]; + u = c->userdata; + if (c->find) { + r = c->find(bus, path, c->interface, &u, u); + if (r <= 0) + return r; + } - bus->object_callbacks_modified = false; + if (userdata) + *userdata = u; - c = hashmap_get(bus->object_callbacks, m->path); - if (c && c->last_iteration != bus->iteration_counter) { + return 1; +} - c->last_iteration = bus->iteration_counter; +static void *vtable_property_convert_userdata(const sd_bus_vtable *p, void *u) { + assert(p); - r = sd_bus_message_rewind(m, true); - if (r < 0) - return r; + return (uint8_t*) u + p->property.offset; +} - r = c->callback(bus, m, c->userdata); - if (r != 0) - return r; +static int vtable_property_get_userdata( + sd_bus *bus, + const char *path, + struct vtable_member *p, + void **userdata) { - found = true; - } + void *u; + int r; - /* Look for fallback prefixes */ - strcpy(p, m->path); - for (;;) { - char *e; + assert(bus); + assert(path); + assert(p); + assert(userdata); - if (bus->object_callbacks_modified) - break; + r = node_vtable_get_userdata(bus, path, p->parent, &u); + if (r <= 0) + return r; - e = strrchr(p, '/'); - if (e == p || !e) - break; + *userdata = vtable_property_convert_userdata(p->vtable, u); + return 1; +} - *e = 0; +static int add_enumerated_to_set(sd_bus *bus, const char *prefix, struct node_enumerator *first, Set *s) { + struct node_enumerator *c; + int r; - c = hashmap_get(bus->object_callbacks, p); - if (c && c->last_iteration != bus->iteration_counter && c->is_fallback) { + assert(bus); + assert(prefix); + assert(s); - c->last_iteration = bus->iteration_counter; + LIST_FOREACH(enumerators, c, first) { + char **children = NULL, **k; - r = sd_bus_message_rewind(m, true); - if (r < 0) - return r; + r = c->callback(bus, prefix, &children, c->userdata); + if (r < 0) + return r; - r = c->callback(bus, m, c->userdata); - if (r != 0) - return r; + STRV_FOREACH(k, children) { + if (r < 0) { + free(*k); + continue; + } - found = true; + if (!object_path_is_valid(*k) && object_path_startswith(*k, prefix)) { + free(*k); + r = -EINVAL; + continue; } + + r = set_consume(s, *k); } - } while (bus->object_callbacks_modified); + free(children); + if (r < 0) + return r; + } - /* We found some handlers but none wanted to take this, then - * return this -- with one exception, we can handle - * introspection minimally ourselves */ - if (!found || sd_bus_message_is_method_call(m, "org.freedesktop.DBus.Introspectable", "Introspect")) - return 0; + return 0; +} - sd_bus_error_set(&error, - "org.freedesktop.DBus.Error.UnknownMethod", - "Unknown method '%s' or interface '%s'.", m->member, m->interface); +static int add_subtree_to_set(sd_bus *bus, const char *prefix, struct node *n, Set *s) { + struct node *i; + int r; - r = sd_bus_message_new_method_error(bus, m, &error, &reply); - if (r < 0) - return r; + assert(bus); + assert(prefix); + assert(n); + assert(s); - r = sd_bus_send(bus, reply, NULL); + r = add_enumerated_to_set(bus, prefix, n->enumerators, s); if (r < 0) return r; - return 1; + LIST_FOREACH(siblings, i, n->child) { + char *t; + + t = strdup(i->path); + if (!t) + return -ENOMEM; + + r = set_consume(s, t); + if (r < 0 && r != -EEXIST) + return r; + + r = add_subtree_to_set(bus, prefix, i, s); + if (r < 0) + return r; + } + + return 0; } -static int process_introspect(sd_bus *bus, sd_bus_message *m) { - _cleanup_bus_message_unref_ sd_bus_message *reply = NULL; - _cleanup_free_ char *introspection = NULL; - _cleanup_set_free_free_ Set *s = NULL; - _cleanup_fclose_ FILE *f = NULL; - struct object_callback *c; - Iterator i; - size_t size = 0; - char *node; +static int get_child_nodes(sd_bus *bus, const char *prefix, struct node *n, Set **_s) { + Set *s = NULL; int r; assert(bus); - assert(m); - - if (!sd_bus_message_is_method_call(m, "org.freedesktop.DBus.Introspectable", "Introspect")) - return 0; - - if (!m->path) - return 0; + assert(n); + assert(_s); s = set_new(string_hash_func, string_compare_func); if (!s) return -ENOMEM; - HASHMAP_FOREACH(c, bus->object_callbacks, i) { - const char *e; - char *a, *p; + r = add_subtree_to_set(bus, prefix, n, s); + if (r < 0) { + set_free_free(s); + return r; + } + + *_s = s; + return 0; +} + +static int node_callbacks_run( + sd_bus *bus, + sd_bus_message *m, + struct node_callback *first, + bool require_fallback, + bool *found_object) { + + struct node_callback *c; + int r; + + assert(bus); + assert(m); + assert(found_object); - if (streq(c->path, "/")) + LIST_FOREACH(callbacks, c, first) { + if (require_fallback && !c->is_fallback) continue; - if (streq(m->path, "/")) - e = c->path; - else { - e = startswith(c->path, m->path); - if (!e || *e != '/') - continue; - } + *found_object = true; - a = strdup(e+1); - if (!a) - return -ENOMEM; + if (c->last_iteration == bus->iteration_counter) + continue; - p = strchr(a, '/'); - if (p) - *p = 0; + r = sd_bus_message_rewind(m, true); + if (r < 0) + return r; - r = set_consume(s, a); - if (r < 0 && r != -EEXIST) + r = c->callback(bus, m, c->userdata); + if (r != 0) return r; } - f = open_memstream(&introspection, &size); - if (!f) - return -ENOMEM; + return 0; +} - fputs(SD_BUS_INTROSPECT_DOCTYPE, f); - fputs("\n", f); - fputs(SD_BUS_INTROSPECT_INTERFACE_PEER, f); - fputs(SD_BUS_INTROSPECT_INTERFACE_INTROSPECTABLE, f); +static int method_callbacks_run( + sd_bus *bus, + sd_bus_message *m, + struct vtable_member *c, + bool require_fallback, + bool *found_object) { - while ((node = set_steal_first(s))) { - fprintf(f, " \n", node); - free(node); - } + const char *signature; + void *u; + int r; + + assert(bus); + assert(m); + assert(c); + assert(found_object); - fputs("\n", f); + if (require_fallback && !c->parent->is_fallback) + return 0; - fflush(f); + r = node_vtable_get_userdata(bus, m->path, c->parent, &u); + if (r <= 0) + return r; - if (ferror(f)) - return -ENOMEM; + *found_object = true; - r = sd_bus_message_new_method_return(bus, m, &reply); + r = sd_bus_message_rewind(m, true); if (r < 0) return r; - r = sd_bus_message_append(reply, "s", introspection); + r = sd_bus_message_get_signature(m, true, &signature); if (r < 0) return r; - r = sd_bus_send(bus, reply, NULL); + if (!streq(strempty(c->vtable->method.signature), signature)) { + r = sd_bus_reply_method_errorf(bus, m, + "org.freedesktop.DBus.Error.InvalidArgs", + "Invalid arguments '%s' to call %s:%s, expecting '%s'.", + signature, c->interface, c->member, strempty(c->vtable->method.signature)); + if (r < 0) + return r; + + return 1; + } + + if (c->vtable->method.handler) + return c->vtable->method.handler(bus, m, u); + + /* If the method callback is NULL, make this a successful NOP */ + r = sd_bus_reply_method_return(bus, m, NULL); if (r < 0) return r; return 1; } -static int process_message(sd_bus *bus, sd_bus_message *m) { +static int invoke_property_get( + sd_bus *bus, + const sd_bus_vtable *v, + const char *path, + const char *interface, + const char *property, + sd_bus_message *m, + sd_bus_error *error, + void *userdata) { + int r; + void *p; assert(bus); - assert(m); + assert(v); - bus->iteration_counter++; + if (v->property.get) + return v->property.get(bus, path, interface, property, m, error, userdata); - r = process_hello(bus, m); - if (r != 0) - return r; + /* Automatic handling if no callback is defined. */ - r = process_reply(bus, m); - if (r != 0) - return r; + assert(bus_type_is_basic(v->property.signature[0])); - r = process_filter(bus, m); - if (r != 0) - return r; + switch (v->property.signature[0]) { - r = process_match(bus, m); - if (r != 0) - return r; + case SD_BUS_TYPE_STRING: + case SD_BUS_TYPE_OBJECT_PATH: + case SD_BUS_TYPE_SIGNATURE: + p = *(char**) userdata; + break; - r = process_builtin(bus, m); - if (r != 0) - return r; + default: + p = userdata; + break; + } - r = process_object(bus, m); - if (r != 0) + r = sd_bus_message_append_basic(m, v->property.signature[0], p); + if (r < 0) return r; - return process_introspect(bus, m); + return 1; } -static int process_running(sd_bus *bus, sd_bus_message **ret) { - _cleanup_bus_message_unref_ sd_bus_message *m = NULL; +static int invoke_property_set( + sd_bus *bus, + const sd_bus_vtable *v, + const char *path, + const char *interface, + const char *property, + sd_bus_message *value, + sd_bus_error *error, + void *userdata) { + int r; assert(bus); - assert(bus->state == BUS_RUNNING || bus->state == BUS_HELLO); + assert(v); - r = process_timeout(bus); - if (r != 0) - goto null_message; + if (v->property.set) + return v->property.set(bus, path, interface, property, value, error, userdata); - r = dispatch_wqueue(bus); - if (r != 0) - goto null_message; + /* Automatic handling if no callback is defined. */ - r = dispatch_rqueue(bus, &m); - if (r < 0) - return r; - if (!m) - goto null_message; + assert(signature_is_single(v->property.signature, false)); + assert(bus_type_is_basic(v->property.signature[0])); - r = process_message(bus, m); - if (r != 0) - goto null_message; + switch (v->property.signature[0]) { - if (ret) { - r = sd_bus_message_rewind(m, true); + case SD_BUS_TYPE_STRING: + case SD_BUS_TYPE_OBJECT_PATH: + case SD_BUS_TYPE_SIGNATURE: { + const char *p; + char *n; + + r = sd_bus_message_read_basic(value, v->property.signature[0], &p); if (r < 0) return r; - *ret = m; - m = NULL; - return 1; - } + n = strdup(p); + if (!n) + return -ENOMEM; - if (m->header->type == SD_BUS_MESSAGE_TYPE_METHOD_CALL) { - _cleanup_bus_message_unref_ sd_bus_message *reply = NULL; - _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; + free(*(char**) userdata); + *(char**) userdata = n; - sd_bus_error_set(&error, "org.freedesktop.DBus.Error.UnknownObject", "Unknown object '%s'.", m->path); + break; + } - r = sd_bus_message_new_method_error(bus, m, &error, &reply); + default: + r = sd_bus_message_read_basic(value, v->property.signature[0], userdata); if (r < 0) return r; - r = sd_bus_send(bus, reply, NULL); - if (r < 0) - return r; + break; } return 1; - -null_message: - if (r >= 0 && ret) - *ret = NULL; - - return r; } -int sd_bus_process(sd_bus *bus, sd_bus_message **ret) { +static int property_get_set_callbacks_run( + sd_bus *bus, + sd_bus_message *m, + struct vtable_member *c, + bool require_fallback, + bool is_get, + bool *found_object) { + + _cleanup_bus_message_unref_ sd_bus_message *reply = NULL; + _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; + void *u; int r; - /* Returns 0 when we didn't do anything. This should cause the - * caller to invoke sd_bus_wait() before returning the next - * time. Returns > 0 when we did something, which possibly - * means *ret is filled in with an unprocessed message. */ + assert(bus); + assert(m); + assert(found_object); - if (!bus) - return -EINVAL; - if (bus_pid_changed(bus)) - return -ECHILD; + if (require_fallback && !c->parent->is_fallback) + return 0; - /* We don't allow recursively invoking sd_bus_process(). */ - if (bus->processing) - return -EBUSY; + r = vtable_property_get_userdata(bus, m->path, c, &u); + if (r <= 0) + return r; + + *found_object = true; + + r = sd_bus_message_new_method_return(bus, m, &reply); + if (r < 0) + return r; + + c->last_iteration = bus->iteration_counter; + + if (is_get) { + r = sd_bus_message_open_container(reply, 'v', c->vtable->property.signature); + if (r < 0) + return r; + + r = invoke_property_get(bus, c->vtable, m->path, c->interface, c->member, reply, &error, u); + if (r < 0) + return r; + + if (sd_bus_error_is_set(&error)) { + r = sd_bus_reply_method_error(bus, m, &error); + if (r < 0) + return r; + + return 1; + } + + r = sd_bus_message_close_container(reply); + if (r < 0) + return r; + + } 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); + else { + r = sd_bus_message_enter_container(m, 'v', c->vtable->property.signature); + if (r < 0) + return r; + + r = invoke_property_set(bus, c->vtable, m->path, c->interface, c->member, m, &error, u); + if (r < 0) + return r; + } + + if (sd_bus_error_is_set(&error)) { + r = sd_bus_reply_method_error(bus, m, &error); + if (r < 0) + return r; + + return 1; + } + + r = sd_bus_message_exit_container(m); + if (r < 0) + return r; + } + + r = sd_bus_send(bus, reply, NULL); + if (r < 0) + return r; + + return 1; +} + +static int vtable_append_all_properties( + sd_bus *bus, + sd_bus_message *reply, + const char *path, + struct node_vtable *c, + void *userdata, + sd_bus_error *error) { + + const sd_bus_vtable *v; + int r; + + assert(bus); + assert(reply); + assert(c); + + for (v = c->vtable+1; v->type != _SD_BUS_VTABLE_END; v++) { + if (v->type != _SD_BUS_VTABLE_PROPERTY && v->type != _SD_BUS_VTABLE_WRITABLE_PROPERTY) + continue; + + r = sd_bus_message_open_container(reply, 'e', "sv"); + if (r < 0) + return r; + + r = sd_bus_message_append(reply, "s", c->interface); + if (r < 0) + return r; + + r = sd_bus_message_open_container(reply, 'v', v->property.signature); + if (r < 0) + return r; + + r = invoke_property_get(bus, v, path, c->interface, v->property.member, reply, error, vtable_property_convert_userdata(v, userdata)); + if (r < 0) + return r; + + if (sd_bus_error_is_set(error)) + return 0; + + r = sd_bus_message_close_container(reply); + if (r < 0) + return r; + + r = sd_bus_message_close_container(reply); + if (r < 0) + return r; + } + + return 1; +} + +static int property_get_all_callbacks_run( + sd_bus *bus, + sd_bus_message *m, + struct node_vtable *first, + bool require_fallback, + const char *iface, + bool *found_object) { + + _cleanup_bus_message_unref_ sd_bus_message *reply = NULL; + struct node_vtable *c; + bool found_interface = false; + int r; + + assert(bus); + assert(m); + assert(found_object); + + r = sd_bus_message_new_method_return(bus, m, &reply); + if (r < 0) + return r; + + r = sd_bus_message_open_container(reply, 'a', "{sv}"); + if (r < 0) + return r; + + LIST_FOREACH(vtables, c, first) { + _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; + void *u; + + if (require_fallback && !c->is_fallback) + continue; + + r = node_vtable_get_userdata(bus, m->path, c, &u); + if (r < 0) + return r; + if (r == 0) + continue; + + *found_object = true; + + if (iface && !streq(c->interface, iface)) + continue; + found_interface = true; + + c->last_iteration = bus->iteration_counter; + + r = vtable_append_all_properties(bus, reply, m->path, c, u, &error); + if (r < 0) + return r; + + if (sd_bus_error_is_set(&error)) { + r = sd_bus_reply_method_error(bus, m, &error); + if (r < 0) + return r; + + return 1; + } + } + + if (!found_interface) { + r = sd_bus_reply_method_errorf( + bus, m, + "org.freedesktop.DBus.Error.UnknownInterface", + "Unknown interface '%s'.", iface); + if (r < 0) + return r; + + return 1; + } + + r = sd_bus_message_close_container(reply); + if (r < 0) + return r; + + r = sd_bus_send(bus, reply, NULL); + if (r < 0) + return r; + + return 1; +} + +static bool bus_node_with_object_manager(sd_bus *bus, struct node *n) { + assert(bus); + + if (n->object_manager) + return true; + + if (n->parent) + return bus_node_with_object_manager(bus, n->parent); + + return false; +} + +static bool bus_node_exists(sd_bus *bus, struct node *n, const char *path, bool require_fallback) { + struct node_vtable *c; + struct node_callback *k; + + assert(bus); + assert(n); + + /* Tests if there's anything attached directly to this node + * for the specified path */ + + LIST_FOREACH(callbacks, k, n->callbacks) { + if (require_fallback && !k->is_fallback) + continue; + + return true; + } + + LIST_FOREACH(vtables, c, n->vtables) { + + if (require_fallback && !c->is_fallback) + continue; + + if (node_vtable_get_userdata(bus, path, c, NULL) > 0) + return true; + } + + return !require_fallback && (n->enumerators || n->object_manager); +} + +static int process_introspect( + sd_bus *bus, + sd_bus_message *m, + struct node *n, + bool require_fallback, + bool *found_object) { + + _cleanup_bus_message_unref_ sd_bus_message *reply = NULL; + _cleanup_set_free_free_ Set *s = NULL; + struct introspect intro; + struct node_vtable *c; + bool empty; + int r; + + assert(bus); + assert(m); + assert(n); + assert(found_object); + + r = get_child_nodes(bus, m->path, n, &s); + if (r < 0) + return r; + + r = introspect_begin(&intro); + if (r < 0) + return r; + + r = introspect_write_default_interfaces(&intro, bus_node_with_object_manager(bus, n)); + if (r < 0) + return r; + + empty = set_isempty(s); + + LIST_FOREACH(vtables, c, n->vtables) { + if (require_fallback && !c->is_fallback) + continue; + + r = node_vtable_get_userdata(bus, m->path, c, NULL); + if (r < 0) + return r; + if (r == 0) + continue; + + empty = false; + + r = introspect_write_interface(&intro, c->interface, c->vtable); + if (r < 0) + goto finish; + } + + if (empty) { + /* Nothing?, let's see if we exist at all, and if not + * refuse to do anything */ + r = bus_node_exists(bus, n, m->path, require_fallback); + if (r < 0) + return r; + + if (r == 0) + goto finish; + } + + *found_object = true; + + r = introspect_write_child_nodes(&intro, s, m->path); + if (r < 0) + goto finish; + + r = introspect_finish(&intro, bus, m, &reply); + if (r < 0) + goto finish; + + r = sd_bus_send(bus, reply, NULL); + if (r < 0) + goto finish; + + r = 1; + +finish: + introspect_free(&intro); + return r; +} + +static int object_manager_serialize_vtable( + sd_bus *bus, + sd_bus_message *reply, + const char *path, + struct node_vtable *c, + sd_bus_error *error) { + + void *u; + int r; + + assert(bus); + assert(reply); + assert(path); + assert(c); + assert(error); + + r = node_vtable_get_userdata(bus, path, c, &u); + if (r <= 0) + return r; + + r = sd_bus_message_open_container(reply, 'e', "sa{sv}"); + if (r < 0) + return r; + + r = sd_bus_message_append(reply, "s", c->interface); + if (r < 0) + return r; + + r = sd_bus_message_open_container(reply, 'a', "{sv}"); + if (r < 0) + return r; + + r = vtable_append_all_properties(bus, reply, path, c, u, error); + if (r < 0) + return r; + + r = sd_bus_message_close_container(reply); + if (r < 0) + return r; + + r = sd_bus_message_close_container(reply); + if (r < 0) + return r; + + return 0; +} + +static int object_manager_serialize_path( + sd_bus *bus, + sd_bus_message *reply, + const char *prefix, + const char *path, + bool require_fallback, + sd_bus_error *error) { + + struct node_vtable *i; + struct node *n; + int r; + + assert(bus); + assert(reply); + assert(prefix); + assert(path); + assert(error); + + n = hashmap_get(bus->nodes, prefix); + if (!n) + return 0; + + r = sd_bus_message_open_container(reply, 'e', "oa{sa{sv}}"); + if (r < 0) + return r; + + r = sd_bus_message_append(reply, "o", path); + if (r < 0) + return r; + + r = sd_bus_message_open_container(reply, 'a', "{sa{sv}}"); + if (r < 0) + return r; + + LIST_FOREACH(vtables, i, n->vtables) { + + if (require_fallback && !i->is_fallback) + continue; + + r = object_manager_serialize_vtable(bus, reply, path, i, error); + if (r < 0) + return r; + if (sd_bus_error_is_set(error)) + return 0; + } + + r = sd_bus_message_close_container(reply); + if (r < 0) + return r; + + r = sd_bus_message_close_container(reply); + if (r < 0) + return r; + + return 1; +} + +static int object_manager_serialize_path_and_fallbacks( + sd_bus *bus, + sd_bus_message *reply, + const char *path, + sd_bus_error *error) { + + size_t pl; + int r; + + assert(bus); + assert(reply); + assert(path); + assert(error); + + /* First, add all vtables registered for this path */ + r = object_manager_serialize_path(bus, reply, path, path, false, error); + if (r < 0) + return r; + if (sd_bus_error_is_set(error)) + return 0; + + /* Second, add fallback vtables registered for any of the prefixes */ + pl = strlen(path); + if (pl > 1) { + char p[pl + 1]; + strcpy(p, path); + + for (;;) { + char *e; + + e = strrchr(p, '/'); + if (e == p || !e) + break; + + *e = 0; + + r = object_manager_serialize_path(bus, reply, p, path, true, error); + if (r < 0) + return r; + + if (sd_bus_error_is_set(error)) + return 0; + } + } + + return 0; +} + +static int process_get_managed_objects( + sd_bus *bus, + sd_bus_message *m, + struct node *n, + bool require_fallback, + bool *found_object) { + + _cleanup_bus_message_unref_ sd_bus_message *reply = NULL; + _cleanup_set_free_free_ Set *s = NULL; + bool empty; + int r; + + assert(bus); + assert(m); + assert(n); + assert(found_object); + + if (!bus_node_with_object_manager(bus, n)) + return 0; + + r = get_child_nodes(bus, m->path, n, &s); + if (r < 0) + return r; + + r = sd_bus_message_new_method_return(bus, m, &reply); + if (r < 0) + return r; + + r = sd_bus_message_open_container(reply, 'a', "{oa{sa{sv}}}"); + if (r < 0) + return r; + + empty = set_isempty(s); + if (empty) { + struct node_vtable *c; + + /* Hmm, so we have no children? Then let's check + * whether we exist at all, i.e. whether at least one + * vtable exists. */ + + LIST_FOREACH(vtables, c, n->vtables) { + + if (require_fallback && !c->is_fallback) + continue; + + if (r < 0) + return r; + if (r == 0) + continue; + + empty = false; + break; + } + + if (empty) + return 0; + } else { + Iterator i; + char *path; + + SET_FOREACH(path, s, i) { + _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; + + r = object_manager_serialize_path_and_fallbacks(bus, reply, path, &error); + if (r < 0) + return -ENOMEM; + + if (sd_bus_error_is_set(&error)) { + r = sd_bus_reply_method_error(bus, m, &error); + if (r < 0) + return r; + + return 1; + } + } + } + + r = sd_bus_message_close_container(reply); + if (r < 0) + return r; + + r = sd_bus_send(bus, reply, NULL); + if (r < 0) + return r; + + return 1; +} + +static int object_find_and_run( + sd_bus *bus, + sd_bus_message *m, + const char *p, + bool require_fallback, + bool *found_object) { + + struct node *n; + struct vtable_member vtable_key, *v; + int r; + + assert(bus); + assert(m); + assert(p); + assert(found_object); + + n = hashmap_get(bus->nodes, p); + if (!n) + return 0; + + /* First, try object callbacks */ + r = node_callbacks_run(bus, m, n->callbacks, require_fallback, found_object); + if (r != 0) + return r; + + if (!m->interface || !m->member) + return 0; + + /* Then, look for a known method */ + vtable_key.path = (char*) p; + vtable_key.interface = m->interface; + vtable_key.member = m->member; + + v = hashmap_get(bus->vtable_methods, &vtable_key); + if (v) { + r = method_callbacks_run(bus, m, v, require_fallback, found_object); + if (r != 0) + return r; + } + + /* Then, look for a known property */ + if (streq(m->interface, "org.freedesktop.DBus.Properties")) { + bool get = false; + + get = streq(m->member, "Get"); + + if (get || streq(m->member, "Set")) { + + r = sd_bus_message_rewind(m, true); + if (r < 0) + return r; + + vtable_key.path = (char*) p; + + r = sd_bus_message_read(m, "ss", &vtable_key.interface, &vtable_key.member); + if (r < 0) + return r; + + v = hashmap_get(bus->vtable_properties, &vtable_key); + if (v) { + r = property_get_set_callbacks_run(bus, m, v, require_fallback, get, found_object); + if (r != 0) + return r; + } + + } else if (streq(m->member, "GetAll")) { + const char *iface; + + r = sd_bus_message_rewind(m, true); + if (r < 0) + return r; + + r = sd_bus_message_read(m, "s", &iface); + if (r < 0) + return r; + + if (iface[0] == 0) + iface = NULL; + + r = property_get_all_callbacks_run(bus, m, n->vtables, require_fallback, iface, found_object); + if (r != 0) + return r; + } + + } else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus.Introspectable", "Introspect")) { + + r = process_introspect(bus, m, n, require_fallback, found_object); + if (r != 0) + return r; + + } else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus.ObjectManager", "GetManagedObjects")) { + + r = process_get_managed_objects(bus, m, n, require_fallback, found_object); + if (r != 0) + return r; + } + + if (!*found_object) { + r = bus_node_exists(bus, n, m->path, require_fallback); + if (r < 0) + return r; + + if (r > 0) + *found_object = true; + } + + return 0; +} + +static int process_object(sd_bus *bus, sd_bus_message *m) { + int r; + size_t pl; + bool found_object = false; + + assert(bus); + assert(m); + + if (m->header->type != SD_BUS_MESSAGE_TYPE_METHOD_CALL) + return 0; + + if (!m->path) + return 0; + + if (hashmap_isempty(bus->nodes)) + return 0; + + pl = strlen(m->path); + do { + char p[pl+1]; + + bus->nodes_modified = false; + + r = object_find_and_run(bus, m, m->path, false, &found_object); + if (r != 0) + return r; + + /* Look for fallback prefixes */ + strcpy(p, m->path); + for (;;) { + char *e; + + if (streq(p, "/")) + break; + + if (bus->nodes_modified) + break; + + e = strrchr(p, '/'); + assert(e); + if (e == p) + *(e+1) = 0; + else + *e = 0; + + r = object_find_and_run(bus, m, p, true, &found_object); + if (r != 0) + return r; + } + + } while (bus->nodes_modified); + + if (!found_object) + return 0; + + if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus.Properties", "Get") || + 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", + "Unknown property or interface."); + else + r = sd_bus_reply_method_errorf( + bus, m, + "org.freedesktop.DBus.Error.UnknownMethod", + "Unknown method '%s' or interface '%s'.", m->member, m->interface); + + if (r < 0) + return r; + + return 1; +} + +static int process_message(sd_bus *bus, sd_bus_message *m) { + int r; + + assert(bus); + assert(m); + + bus->iteration_counter++; + + r = process_hello(bus, m); + if (r != 0) + return r; + + r = process_reply(bus, m); + if (r != 0) + return r; + + r = process_filter(bus, m); + if (r != 0) + return r; + + r = process_match(bus, m); + if (r != 0) + return r; + + r = process_builtin(bus, m); + if (r != 0) + return r; + + return process_object(bus, m); +} + +static int process_running(sd_bus *bus, sd_bus_message **ret) { + _cleanup_bus_message_unref_ sd_bus_message *m = NULL; + int r; + + assert(bus); + assert(bus->state == BUS_RUNNING || bus->state == BUS_HELLO); + + r = process_timeout(bus); + if (r != 0) + goto null_message; + + r = dispatch_wqueue(bus); + if (r != 0) + goto null_message; + + r = dispatch_rqueue(bus, &m); + if (r < 0) + return r; + if (!m) + goto null_message; + + r = process_message(bus, m); + if (r != 0) + goto null_message; + + if (ret) { + r = sd_bus_message_rewind(m, true); + if (r < 0) + return r; + + *ret = m; + m = NULL; + return 1; + } + + if (m->header->type == SD_BUS_MESSAGE_TYPE_METHOD_CALL) { + + r = sd_bus_reply_method_errorf( + bus, m, + "org.freedesktop.DBus.Error.UnknownObject", + "Unknown object '%s'.", m->path); + if (r < 0) + return r; + } + + return 1; + +null_message: + if (r >= 0 && ret) + *ret = NULL; + + return r; +} + +int sd_bus_process(sd_bus *bus, sd_bus_message **ret) { + int r; + + /* Returns 0 when we didn't do anything. This should cause the + * caller to invoke sd_bus_wait() before returning the next + * time. Returns > 0 when we did something, which possibly + * means *ret is filled in with an unprocessed message. */ + + if (!bus) + return -EINVAL; + if (bus_pid_changed(bus)) + return -ECHILD; + + /* We don't allow recursively invoking sd_bus_process(). */ + if (bus->processing) + return -EBUSY; + + switch (bus->state) { + + case BUS_UNSET: + case BUS_CLOSED: + return -ENOTCONN; + + case BUS_OPENING: + r = bus_socket_process_opening(bus); + if (r < 0) + return r; + if (ret) + *ret = NULL; + return r; + + case BUS_AUTHENTICATING: + + r = bus_socket_process_authenticating(bus); + if (r < 0) + return r; + if (ret) + *ret = NULL; + return r; + + case BUS_RUNNING: + case BUS_HELLO: + + bus->processing = true; + r = process_running(bus, ret); + bus->processing = false; + + return r; + } + + assert_not_reached("Unknown state"); +} + +static int bus_poll(sd_bus *bus, bool need_more, uint64_t timeout_usec) { + struct pollfd p[2] = {}; + int r, e, n; + struct timespec ts; + usec_t until, m; + + assert(bus); + + if (!BUS_IS_OPEN(bus->state)) + return -ENOTCONN; + + e = sd_bus_get_events(bus); + if (e < 0) + return e; + + if (need_more) + e |= POLLIN; + + r = sd_bus_get_timeout(bus, &until); + if (r < 0) + return r; + if (r == 0) + m = (uint64_t) -1; + else { + usec_t nw; + nw = now(CLOCK_MONOTONIC); + m = until > nw ? until - nw : 0; + } + + if (timeout_usec != (uint64_t) -1 && (m == (uint64_t) -1 || timeout_usec < m)) + m = timeout_usec; + + p[0].fd = bus->input_fd; + if (bus->output_fd == bus->input_fd) { + p[0].events = e; + n = 1; + } else { + p[0].events = e & POLLIN; + p[1].fd = bus->output_fd; + p[1].events = e & POLLOUT; + n = 2; + } + + r = ppoll(p, n, m == (uint64_t) -1 ? NULL : timespec_store(&ts, m), NULL); + if (r < 0) + return -errno; + + return r > 0 ? 1 : 0; +} + +int sd_bus_wait(sd_bus *bus, uint64_t timeout_usec) { + + if (!bus) + return -EINVAL; + if (!BUS_IS_OPEN(bus->state)) + return -ENOTCONN; + if (bus_pid_changed(bus)) + return -ECHILD; + + if (bus->rqueue_size > 0) + return 0; + + return bus_poll(bus, false, timeout_usec); +} + +int sd_bus_flush(sd_bus *bus) { + int r; + + if (!bus) + return -EINVAL; + if (!BUS_IS_OPEN(bus->state)) + return -ENOTCONN; + if (bus_pid_changed(bus)) + return -ECHILD; + + r = bus_ensure_running(bus); + if (r < 0) + return r; + + if (bus->wqueue_size <= 0) + return 0; + + for (;;) { + r = dispatch_wqueue(bus); + if (r < 0) + return r; + + if (bus->wqueue_size <= 0) + return 0; + + r = bus_poll(bus, false, (uint64_t) -1); + if (r < 0) + return r; + } +} + +int sd_bus_add_filter(sd_bus *bus, sd_bus_message_handler_t callback, void *userdata) { + struct filter_callback *f; + + if (!bus) + return -EINVAL; + if (!callback) + return -EINVAL; + if (bus_pid_changed(bus)) + return -ECHILD; + + f = new0(struct filter_callback, 1); + if (!f) + return -ENOMEM; + f->callback = callback; + f->userdata = userdata; + + bus->filter_callbacks_modified = true; + LIST_PREPEND(struct filter_callback, callbacks, bus->filter_callbacks, f); + return 0; +} + +int sd_bus_remove_filter(sd_bus *bus, sd_bus_message_handler_t callback, void *userdata) { + struct filter_callback *f; + + if (!bus) + return -EINVAL; + if (!callback) + return -EINVAL; + if (bus_pid_changed(bus)) + return -ECHILD; + + LIST_FOREACH(callbacks, f, bus->filter_callbacks) { + if (f->callback == callback && f->userdata == userdata) { + bus->filter_callbacks_modified = true; + LIST_REMOVE(struct filter_callback, callbacks, bus->filter_callbacks, f); + free(f); + return 1; + } + } + + return 0; +} + +static struct node *bus_node_allocate(sd_bus *bus, const char *path) { + struct node *n, *parent; + const char *e; + char *s, *p; + int r; + + assert(bus); + assert(path); + assert(path[0] == '/'); + + n = hashmap_get(bus->nodes, path); + if (n) + return n; + + r = hashmap_ensure_allocated(&bus->nodes, string_hash_func, string_compare_func); + if (r < 0) + return NULL; + + s = strdup(path); + if (!s) + return NULL; + + if (streq(path, "/")) + parent = NULL; + else { + e = strrchr(path, '/'); + assert(e); + + p = strndupa(path, MAX(1, path - e)); + + parent = bus_node_allocate(bus, p); + if (!parent) { + free(s); + return NULL; + } + } + + n = new0(struct node, 1); + if (!n) + return NULL; + + n->parent = parent; + n->path = s; + + r = hashmap_put(bus->nodes, s, n); + if (r < 0) { + free(s); + free(n); + return NULL; + } + + if (parent) + LIST_PREPEND(struct node, siblings, parent->child, n); + + return n; +} + +static void bus_node_gc(sd_bus *b, struct node *n) { + assert(b); + + if (!n) + return; + + if (n->child || + n->callbacks || + n->vtables || + n->enumerators || + n->object_manager) + return; + + assert(hashmap_remove(b->nodes, n->path) == n); + + if (n->parent) + LIST_REMOVE(struct node, siblings, n->parent->child, n); + + free(n->path); + bus_node_gc(b, n->parent); + free(n); +} + +static int bus_add_object( + sd_bus *b, + bool fallback, + const char *path, + sd_bus_message_handler_t callback, + void *userdata) { + + struct node_callback *c; + struct node *n; + int r; + + if (!b) + return -EINVAL; + if (!object_path_is_valid(path)) + return -EINVAL; + if (!callback) + return -EINVAL; + if (bus_pid_changed(b)) + return -ECHILD; + + n = bus_node_allocate(b, path); + if (!n) + return -ENOMEM; + + c = new0(struct node_callback, 1); + if (!c) { + r = -ENOMEM; + goto fail; + } + + c->node = n; + c->callback = callback; + c->userdata = userdata; + c->is_fallback = fallback; + + LIST_PREPEND(struct node_callback, callbacks, n->callbacks, c); + return 0; + +fail: + free(c); + bus_node_gc(b, n); + return r; +} - switch (bus->state) { +static int bus_remove_object( + sd_bus *bus, + bool fallback, + const char *path, + sd_bus_message_handler_t callback, + void *userdata) { - case BUS_UNSET: - case BUS_CLOSED: + struct node_callback *c; + struct node *n; + + if (!bus) + return -EINVAL; + if (!object_path_is_valid(path)) + return -EINVAL; + if (!callback) + return -EINVAL; + if (bus_pid_changed(bus)) + return -ECHILD; + + n = hashmap_get(bus->nodes, path); + if (!n) + return 0; + + LIST_FOREACH(callbacks, c, n->callbacks) + if (c->callback == callback && c->userdata == userdata && c->is_fallback == fallback) + break; + if (!c) + return 0; + + LIST_REMOVE(struct node_callback, callbacks, n->callbacks, c); + free(c); + + bus_node_gc(bus, n); + + return 1; +} + +int sd_bus_add_object(sd_bus *bus, const char *path, sd_bus_message_handler_t callback, void *userdata) { + return bus_add_object(bus, false, path, callback, userdata); +} + +int sd_bus_remove_object(sd_bus *bus, const char *path, sd_bus_message_handler_t callback, void *userdata) { + return bus_remove_object(bus, false, path, callback, userdata); +} + +int sd_bus_add_fallback(sd_bus *bus, const char *prefix, sd_bus_message_handler_t callback, void *userdata) { + return bus_add_object(bus, true, prefix, callback, userdata); +} + +int sd_bus_remove_fallback(sd_bus *bus, const char *prefix, sd_bus_message_handler_t callback, void *userdata) { + return bus_remove_object(bus, true, prefix, callback, userdata); +} + +int sd_bus_add_match(sd_bus *bus, const char *match, sd_bus_message_handler_t callback, void *userdata) { + struct bus_match_component *components = NULL; + unsigned n_components = 0; + uint64_t cookie = 0; + int r = 0; + + if (!bus) + return -EINVAL; + if (!match) + return -EINVAL; + if (bus_pid_changed(bus)) + return -ECHILD; + + r = bus_match_parse(match, &components, &n_components); + if (r < 0) + goto finish; + + if (bus->bus_client) { + cookie = ++bus->match_cookie; + + r = bus_add_match_internal(bus, match, components, n_components, cookie); + if (r < 0) + goto finish; + } + + bus->match_callbacks_modified = true; + r = bus_match_add(&bus->match_callbacks, components, n_components, callback, userdata, cookie, NULL); + if (r < 0) { + if (bus->bus_client) + bus_remove_match_internal(bus, match, cookie); + } + +finish: + bus_match_parse_free(components, n_components); + return r; +} + +int sd_bus_remove_match(sd_bus *bus, const char *match, sd_bus_message_handler_t callback, void *userdata) { + struct bus_match_component *components = NULL; + unsigned n_components = 0; + int r = 0, q = 0; + uint64_t cookie = 0; + + if (!bus) + return -EINVAL; + if (!match) + return -EINVAL; + if (bus_pid_changed(bus)) + return -ECHILD; + + r = bus_match_parse(match, &components, &n_components); + if (r < 0) + return r; + + bus->match_callbacks_modified = true; + r = bus_match_remove(&bus->match_callbacks, components, n_components, callback, userdata, &cookie); + + if (bus->bus_client) + q = bus_remove_match_internal(bus, match, cookie); + + bus_match_parse_free(components, n_components); + + return r < 0 ? r : q; +} + +int sd_bus_emit_signal( + sd_bus *bus, + const char *path, + const char *interface, + const char *member, + const char *types, ...) { + + _cleanup_bus_message_unref_ sd_bus_message *m = NULL; + int r; + + if (!bus) + return -EINVAL; + if (!BUS_IS_OPEN(bus->state)) return -ENOTCONN; + if (bus_pid_changed(bus)) + return -ECHILD; - case BUS_OPENING: - r = bus_socket_process_opening(bus); + r = sd_bus_message_new_signal(bus, path, interface, member, &m); + if (r < 0) + return r; + + if (!isempty(types)) { + va_list ap; + + va_start(ap, types); + r = bus_message_append_ap(m, types, ap); + va_end(ap); if (r < 0) return r; - if (ret) - *ret = NULL; + } + + return sd_bus_send(bus, m, NULL); +} + +int sd_bus_call_method( + sd_bus *bus, + const char *destination, + const char *path, + const char *interface, + const char *member, + sd_bus_error *error, + sd_bus_message **reply, + const char *types, ...) { + + _cleanup_bus_message_unref_ sd_bus_message *m = NULL; + int r; + + if (!bus) + + return -EINVAL; + if (!BUS_IS_OPEN(bus->state)) + return -ENOTCONN; + if (bus_pid_changed(bus)) + return -ECHILD; + + r = sd_bus_message_new_method_call(bus, destination, path, interface, member, &m); + if (r < 0) return r; - case BUS_AUTHENTICATING: + if (!isempty(types)) { + va_list ap; - r = bus_socket_process_authenticating(bus); + va_start(ap, types); + r = bus_message_append_ap(m, types, ap); + va_end(ap); if (r < 0) return r; - if (ret) - *ret = NULL; + } + + return sd_bus_send_with_reply_and_block(bus, m, 0, error, reply); +} + +int sd_bus_reply_method_return( + sd_bus *bus, + sd_bus_message *call, + const char *types, ...) { + + _cleanup_bus_message_unref_ sd_bus_message *m = NULL; + int r; + + if (!bus) + return -EINVAL; + if (!call) + return -EINVAL; + if (!call->sealed) + return -EPERM; + if (call->header->type != SD_BUS_MESSAGE_TYPE_METHOD_CALL) + return -EINVAL; + if (!BUS_IS_OPEN(bus->state)) + return -ENOTCONN; + if (bus_pid_changed(bus)) + return -ECHILD; + + if (call->header->flags & SD_BUS_MESSAGE_NO_REPLY_EXPECTED) + return 0; + + r = sd_bus_message_new_method_return(bus, call, &m); + if (r < 0) return r; - case BUS_RUNNING: - case BUS_HELLO: + if (!isempty(types)) { + va_list ap; - bus->processing = true; - r = process_running(bus, ret); - bus->processing = false; + va_start(ap, types); + r = bus_message_append_ap(m, types, ap); + va_end(ap); + if (r < 0) + return r; + } + + return sd_bus_send(bus, m, NULL); +} + +int sd_bus_reply_method_error( + sd_bus *bus, + sd_bus_message *call, + const sd_bus_error *e) { + + _cleanup_bus_message_unref_ sd_bus_message *m = NULL; + int r; + + if (!bus) + return -EINVAL; + if (!call) + return -EINVAL; + if (!call->sealed) + return -EPERM; + if (call->header->type != SD_BUS_MESSAGE_TYPE_METHOD_CALL) + return -EINVAL; + if (!sd_bus_error_is_set(e)) + return -EINVAL; + if (!BUS_IS_OPEN(bus->state)) + return -ENOTCONN; + if (bus_pid_changed(bus)) + return -ECHILD; + + if (call->header->flags & SD_BUS_MESSAGE_NO_REPLY_EXPECTED) + return 0; + r = sd_bus_message_new_method_error(bus, call, e, &m); + if (r < 0) return r; + + return sd_bus_send(bus, m, NULL); +} + +int sd_bus_reply_method_errorf( + sd_bus *bus, + sd_bus_message *call, + const char *name, + const char *format, + ...) { + + _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; + char *n, *m; + va_list ap; + int r; + + n = strdup(name); + if (!n) + return -ENOMEM; + + if (format) { + va_start(ap, format); + r = vasprintf(&m, format, ap); + va_end(ap); + + if (r < 0) { + free(n); + return -ENOMEM; + } } - assert_not_reached("Unknown state"); + error.name = n; + error.message = m; + error.need_free = true; + + return sd_bus_reply_method_error(bus, call, &error); } -static int bus_poll(sd_bus *bus, bool need_more, uint64_t timeout_usec) { - struct pollfd p[2] = {}; - int r, e, n; - struct timespec ts; - usec_t until, m; +bool bus_pid_changed(sd_bus *bus) { + assert(bus); + + /* We don't support people creating a bus connection and + * keeping it around over a fork(). Let's complain. */ + return bus->original_pid != getpid(); +} + +static void free_node_vtable(sd_bus *bus, struct node_vtable *w) { assert(bus); - if (!BUS_IS_OPEN(bus->state)) - return -ENOTCONN; + if (!w) + return; - e = sd_bus_get_events(bus); - if (e < 0) - return e; + if (w->interface && w->node && w->vtable) { + const sd_bus_vtable *v; - if (need_more) - e |= POLLIN; + for (v = w->vtable; v->type != _SD_BUS_VTABLE_END; v++) { + struct vtable_member *x = NULL; - r = sd_bus_get_timeout(bus, &until); - if (r < 0) - return r; - if (r == 0) - m = (uint64_t) -1; - else { - usec_t nw; - nw = now(CLOCK_MONOTONIC); - m = until > nw ? until - nw : 0; - } + switch (v->type) { - if (timeout_usec != (uint64_t) -1 && (m == (uint64_t) -1 || timeout_usec < m)) - m = timeout_usec; + case _SD_BUS_VTABLE_METHOD: { + struct vtable_member key; - p[0].fd = bus->input_fd; - if (bus->output_fd == bus->input_fd) { - p[0].events = e; - n = 1; - } else { - p[0].events = e & POLLIN; - p[1].fd = bus->output_fd; - p[1].events = e & POLLOUT; - n = 2; + key.path = w->node->path; + key.interface = w->interface; + key.member = v->method.member; + + x = hashmap_remove(bus->vtable_methods, &key); + break; + } + + case _SD_BUS_VTABLE_PROPERTY: + case _SD_BUS_VTABLE_WRITABLE_PROPERTY: { + struct vtable_member key; + + key.path = w->node->path; + key.interface = w->interface; + key.member = v->property.member; + x = hashmap_remove(bus->vtable_properties, &key); + break; + }} + + free(x); + } } - r = ppoll(p, n, m == (uint64_t) -1 ? NULL : timespec_store(&ts, m), NULL); - if (r < 0) - return -errno; + free(w->interface); + free(w); +} - return r > 0 ? 1 : 0; +static unsigned vtable_member_hash_func(const void *a) { + const struct vtable_member *m = a; + + return + string_hash_func(m->path) ^ + string_hash_func(m->interface) ^ + string_hash_func(m->member); } -int sd_bus_wait(sd_bus *bus, uint64_t timeout_usec) { +static int vtable_member_compare_func(const void *a, const void *b) { + const struct vtable_member *x = a, *y = b; + int r; - if (!bus) - return -EINVAL; - if (!BUS_IS_OPEN(bus->state)) - return -ENOTCONN; - if (bus_pid_changed(bus)) - return -ECHILD; + r = strcmp(x->path, y->path); + if (r != 0) + return r; - if (bus->rqueue_size > 0) - return 0; + r = strcmp(x->interface, y->interface); + if (r != 0) + return r; - return bus_poll(bus, false, timeout_usec); + return strcmp(x->member, y->member); } -int sd_bus_flush(sd_bus *bus) { +static int add_object_vtable_internal( + sd_bus *bus, + const char *path, + const char *interface, + const sd_bus_vtable *vtable, + bool fallback, + sd_bus_object_find_t find, + void *userdata) { + + struct node_vtable *c = NULL, *i; + const sd_bus_vtable *v; + struct node *n; int r; if (!bus) return -EINVAL; - if (!BUS_IS_OPEN(bus->state)) - return -ENOTCONN; + if (!object_path_is_valid(path)) + return -EINVAL; + if (!interface_name_is_valid(interface)) + return -EINVAL; + if (!vtable || vtable[0].type != _SD_BUS_VTABLE_START || vtable[0].start.element_size != sizeof(struct sd_bus_vtable)) + return -EINVAL; if (bus_pid_changed(bus)) return -ECHILD; - r = bus_ensure_running(bus); + r = hashmap_ensure_allocated(&bus->vtable_methods, vtable_member_hash_func, vtable_member_compare_func); if (r < 0) return r; - if (bus->wqueue_size <= 0) - return 0; + r = hashmap_ensure_allocated(&bus->vtable_properties, vtable_member_hash_func, vtable_member_compare_func); + if (r < 0) + return r; - for (;;) { - r = dispatch_wqueue(bus); - if (r < 0) - return r; + n = bus_node_allocate(bus, path); + if (!n) + return -ENOMEM; - if (bus->wqueue_size <= 0) - return 0; + LIST_FOREACH(vtables, i, n->vtables) { + if (streq(i->interface, interface)) { + r = -EEXIST; + goto fail; + } - r = bus_poll(bus, false, (uint64_t) -1); - if (r < 0) - return r; + if (i->is_fallback != fallback) { + r = -EPROTOTYPE; + goto fail; + } } -} -int sd_bus_add_filter(sd_bus *bus, sd_bus_message_handler_t callback, void *userdata) { - struct filter_callback *f; + c = new0(struct node_vtable, 1); + if (!c) { + r = -ENOMEM; + goto fail; + } - if (!bus) - return -EINVAL; - if (!callback) - return -EINVAL; - if (bus_pid_changed(bus)) - return -ECHILD; + c->node = n; + c->is_fallback = fallback; + c->vtable = vtable; + c->userdata = userdata; + c->find = find; - f = new0(struct filter_callback, 1); - if (!f) - return -ENOMEM; - f->callback = callback; - f->userdata = userdata; + c->interface = strdup(interface); + if (!c->interface) { + r = -ENOMEM; + goto fail; + } - bus->filter_callbacks_modified = true; - LIST_PREPEND(struct filter_callback, callbacks, bus->filter_callbacks, f); + for (v = c->vtable+1; v->type != _SD_BUS_VTABLE_END; v++) { + + switch (v->type) { + + case _SD_BUS_VTABLE_METHOD: { + struct vtable_member *m; + + if (!member_name_is_valid(v->method.member) || + !signature_is_valid(strempty(v->method.signature), false) || + !signature_is_valid(strempty(v->method.result), false) || + !(v->method.handler || (isempty(v->method.signature) && isempty(v->method.result))) || + v->flags & (SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE|SD_BUS_VTABLE_PROPERTY_INVALIDATE_ONLY)) { + r = -EINVAL; + goto fail; + } + + m = new0(struct vtable_member, 1); + if (!m) { + r = -ENOMEM; + goto fail; + } + + m->parent = c; + m->path = n->path; + m->interface = c->interface; + m->member = v->method.member; + m->vtable = v; + + r = hashmap_put(bus->vtable_methods, m, m); + if (r < 0) { + free(m); + goto fail; + } + + break; + } + + case _SD_BUS_VTABLE_WRITABLE_PROPERTY: + + if (!(v->property.set || bus_type_is_basic(v->property.signature[0]))) { + r = -EINVAL; + goto fail; + } + + /* Fall through */ + + case _SD_BUS_VTABLE_PROPERTY: { + struct vtable_member *m; + + if (!member_name_is_valid(v->property.member) || + !signature_is_single(v->property.signature, false) || + !(v->property.get || bus_type_is_basic(v->property.signature[0])) || + v->flags & SD_BUS_VTABLE_METHOD_NO_REPLY || + (v->flags & SD_BUS_VTABLE_PROPERTY_INVALIDATE_ONLY && !(v->flags & SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE))) { + r = -EINVAL; + goto fail; + } + + + m = new0(struct vtable_member, 1); + if (!m) { + r = -ENOMEM; + goto fail; + } + + m->parent = c; + m->path = n->path; + m->interface = c->interface; + m->member = v->property.member; + m->vtable = v; + + r = hashmap_put(bus->vtable_properties, m, m); + if (r < 0) { + free(m); + goto fail; + } + + break; + } + + case _SD_BUS_VTABLE_SIGNAL: + + if (!member_name_is_valid(v->signal.member) || + !signature_is_single(strempty(v->signal.signature), false)) { + r = -EINVAL; + goto fail; + } + + break; + + default: + r = -EINVAL; + goto fail; + } + } + + LIST_PREPEND(struct node_vtable, vtables, n->vtables, c); return 0; + +fail: + if (c) + free_node_vtable(bus, c); + + bus_node_gc(bus, n); + return r; } -int sd_bus_remove_filter(sd_bus *bus, sd_bus_message_handler_t callback, void *userdata) { - struct filter_callback *f; +static int remove_object_vtable_internal( + sd_bus *bus, + const char *path, + const char *interface, + bool fallback) { + + struct node_vtable *c; + struct node *n; if (!bus) return -EINVAL; - if (!callback) + if (!object_path_is_valid(path)) + return -EINVAL; + if (!interface_name_is_valid(interface)) return -EINVAL; if (bus_pid_changed(bus)) return -ECHILD; - LIST_FOREACH(callbacks, f, bus->filter_callbacks) { - if (f->callback == callback && f->userdata == userdata) { - bus->filter_callbacks_modified = true; - LIST_REMOVE(struct filter_callback, callbacks, bus->filter_callbacks, f); - free(f); - return 1; - } - } + n = hashmap_get(bus->nodes, path); + if (!n) + return 0; - return 0; + LIST_FOREACH(vtables, c, n->vtables) + if (streq(c->interface, interface) && c->is_fallback == fallback) + break; + + if (!c) + return 0; + + LIST_REMOVE(struct node_vtable, vtables, n->vtables, c); + + free_node_vtable(bus, c); + return 1; } -static int bus_add_object( +int sd_bus_add_object_vtable( sd_bus *bus, - bool fallback, const char *path, - sd_bus_message_handler_t callback, + const char *interface, + const sd_bus_vtable *vtable, + void *userdata) { + + return add_object_vtable_internal(bus, path, interface, vtable, false, NULL, userdata); +} + +int sd_bus_remove_object_vtable( + sd_bus *bus, + const char *path, + const char *interface) { + + return remove_object_vtable_internal(bus, path, interface, false); +} + +int sd_bus_add_fallback_vtable( + sd_bus *bus, + const char *path, + const char *interface, + const sd_bus_vtable *vtable, + sd_bus_object_find_t find, + void *userdata) { + + return add_object_vtable_internal(bus, path, interface, vtable, true, find, userdata); +} + +int sd_bus_remove_fallback_vtable( + sd_bus *bus, + const char *path, + const char *interface) { + + return remove_object_vtable_internal(bus, path, interface, true); +} + +int sd_bus_add_node_enumerator( + sd_bus *bus, + const char *path, + sd_bus_node_enumerator_t callback, void *userdata) { - struct object_callback *c; + struct node_enumerator *c; + struct node *n; int r; if (!bus) return -EINVAL; - if (!path) + if (!object_path_is_valid(path)) return -EINVAL; if (!callback) return -EINVAL; if (bus_pid_changed(bus)) return -ECHILD; - r = hashmap_ensure_allocated(&bus->object_callbacks, string_hash_func, string_compare_func); - if (r < 0) - return r; - - c = new0(struct object_callback, 1); - if (!c) + n = bus_node_allocate(bus, path); + if (!n) return -ENOMEM; - c->path = strdup(path); - if (!c->path) { - free(c); - return -ENOMEM; + c = new0(struct node_enumerator, 1); + if (!c) { + r = -ENOMEM; + goto fail; } + c->node = n; c->callback = callback; c->userdata = userdata; - c->is_fallback = fallback; - - bus->object_callbacks_modified = true; - r = hashmap_put(bus->object_callbacks, c->path, c); - if (r < 0) { - free(c->path); - free(c); - return r; - } + LIST_PREPEND(struct node_enumerator, enumerators, n->enumerators, c); return 0; + +fail: + free(c); + bus_node_gc(bus, n); + return r; } -static int bus_remove_object( +int sd_bus_remove_node_enumerator( sd_bus *bus, - bool fallback, const char *path, - sd_bus_message_handler_t callback, + sd_bus_node_enumerator_t callback, void *userdata) { - struct object_callback *c; + struct node_enumerator *c; + struct node *n; if (!bus) return -EINVAL; - if (!path) + if (!object_path_is_valid(path)) return -EINVAL; if (!callback) return -EINVAL; if (bus_pid_changed(bus)) return -ECHILD; - c = hashmap_get(bus->object_callbacks, path); - if (!c) + n = hashmap_get(bus->nodes, path); + if (!n) return 0; - if (c->callback != callback || c->userdata != userdata || c->is_fallback != fallback) - return 0; + LIST_FOREACH(enumerators, c, n->enumerators) + if (c->callback == callback && c->userdata == userdata) + break; - bus->object_callbacks_modified = true; - assert_se(c == hashmap_remove(bus->object_callbacks, c->path)); + if (!c) + return 0; - free(c->path); + LIST_REMOVE(struct node_enumerator, enumerators, n->enumerators, c); free(c); + bus_node_gc(bus, n); + return 1; } -int sd_bus_add_object(sd_bus *bus, const char *path, sd_bus_message_handler_t callback, void *userdata) { - return bus_add_object(bus, false, path, callback, userdata); -} +static int emit_properties_changed_on_interface( + sd_bus *bus, + const char *prefix, + const char *path, + const char *interface, + bool require_fallback, + char **names) { -int sd_bus_remove_object(sd_bus *bus, const char *path, sd_bus_message_handler_t callback, void *userdata) { - return bus_remove_object(bus, false, path, callback, userdata); -} + _cleanup_bus_message_unref_ sd_bus_message *m = NULL; + bool has_invalidating = false; + struct vtable_member key; + struct node_vtable *c; + struct node *n; + char **property; + void *u = NULL; + int r; -int sd_bus_add_fallback(sd_bus *bus, const char *prefix, sd_bus_message_handler_t callback, void *userdata) { - return bus_add_object(bus, true, prefix, callback, userdata); -} + assert(bus); + assert(path); + assert(interface); -int sd_bus_remove_fallback(sd_bus *bus, const char *prefix, sd_bus_message_handler_t callback, void *userdata) { - return bus_remove_object(bus, true, prefix, callback, userdata); -} + n = hashmap_get(bus->nodes, prefix); + if (!n) + return 0; -int sd_bus_add_match(sd_bus *bus, const char *match, sd_bus_message_handler_t callback, void *userdata) { - struct bus_match_component *components = NULL; - unsigned n_components = 0; - uint64_t cookie = 0; - int r = 0; + LIST_FOREACH(vtables, c, n->vtables) { + if (require_fallback && !c->is_fallback) + continue; - if (!bus) - return -EINVAL; - if (!match) - return -EINVAL; - if (bus_pid_changed(bus)) - return -ECHILD; + if (streq(c->interface, interface)) + break; + } - r = bus_match_parse(match, &components, &n_components); + if (!c) + return 0; + + r = node_vtable_get_userdata(bus, path, c, &u); + if (r <= 0) + return r; + + r = sd_bus_message_new_signal(bus, path, "org.freedesktop.DBus.Properties", "PropertiesChanged", &m); if (r < 0) - goto finish; + return r; - if (bus->bus_client) { - cookie = ++bus->match_cookie; + r = sd_bus_message_append(m, "s", interface); + if (r < 0) + return r; - r = bus_add_match_internal(bus, match, components, n_components, cookie); + r = sd_bus_message_open_container(m, 'a', "{sv}"); + if (r < 0) + return r; + + key.path = prefix; + key.interface = interface; + + STRV_FOREACH(property, names) { + _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; + struct vtable_member *v; + + key.member = *property; + v = hashmap_get(bus->vtable_properties, &key); + if (!v) + return -ENOENT; + + assert(c == v->parent); + + if (!(v->vtable->flags & SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE)) + return -EDOM; + if (v->vtable->flags & SD_BUS_VTABLE_PROPERTY_INVALIDATE_ONLY) { + has_invalidating = true; + continue; + } + + r = sd_bus_message_open_container(m, 'e', "sv"); if (r < 0) - goto finish; + return r; + + r = sd_bus_message_append(m, "s", *property); + if (r < 0) + return r; + + r = sd_bus_message_open_container(m, 'v', v->vtable->property.signature); + if (r < 0) + return r; + + 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); + + r = sd_bus_message_close_container(m); + if (r < 0) + return r; + + r = sd_bus_message_close_container(m); + if (r < 0) + return r; } - bus->match_callbacks_modified = true; - r = bus_match_add(&bus->match_callbacks, components, n_components, callback, userdata, cookie, NULL); - if (r < 0) { - if (bus->bus_client) - bus_remove_match_internal(bus, match, cookie); + r = sd_bus_message_close_container(m); + if (r < 0) + return r; + + r = sd_bus_message_open_container(m, 'a', "s"); + if (r < 0) + return r; + + if (has_invalidating) { + STRV_FOREACH(property, names) { + struct vtable_member *v; + + key.member = *property; + assert_se(v = hashmap_get(bus->vtable_properties, &key)); + assert(c == v->parent); + + if (!(v->vtable->flags & SD_BUS_VTABLE_PROPERTY_INVALIDATE_ONLY)) + continue; + + r = sd_bus_message_append(m, "s", *property); + if (r < 0) + return r; + } } -finish: - bus_match_parse_free(components, n_components); - return r; + r = sd_bus_message_close_container(m); + if (r < 0) + return r; + + r = sd_bus_send(bus, m, NULL); + if (r < 0) + return r; + + return 1; } -int sd_bus_remove_match(sd_bus *bus, const char *match, sd_bus_message_handler_t callback, void *userdata) { - struct bus_match_component *components = NULL; - unsigned n_components = 0; - int r = 0, q = 0; - uint64_t cookie = 0; +int sd_bus_emit_properties_changed_strv(sd_bus *bus, const char *path, const char *interface, char **names) { + size_t pl; + int r; if (!bus) return -EINVAL; - if (!match) + if (!object_path_is_valid(path)) + return -EINVAL; + if (!interface_name_is_valid(interface)) return -EINVAL; - if (bus_pid_changed(bus)) - return -ECHILD; - r = bus_match_parse(match, &components, &n_components); - if (r < 0) + r = emit_properties_changed_on_interface(bus, path, path, interface, false, names); + if (r != 0) return r; - bus->match_callbacks_modified = true; - r = bus_match_remove(&bus->match_callbacks, components, n_components, callback, userdata, &cookie); + pl = strlen(path); + if (pl > 1 ) { + char p[pl+1]; - if (bus->bus_client) - q = bus_remove_match_internal(bus, match, cookie); + strcpy(p, path); + for (;;) { + char *e; - bus_match_parse_free(components, n_components); + if (streq(p, "/")) + break; - return r < 0 ? r : q; -} + e = strrchr(p, '/'); + assert(e); + if (e == p) + *(e+1) = 0; + else + *e = 0; -int sd_bus_emit_signal( - sd_bus *bus, - const char *path, - const char *interface, - const char *member, - const char *types, ...) { + r = emit_properties_changed_on_interface(bus, p, path, interface, true, names); + if (r != 0) + return r; + } + } - _cleanup_bus_message_unref_ sd_bus_message *m = NULL; + return -ENOENT; +} + +int sd_bus_emit_properties_changed(sd_bus *bus, const char *path, const char *interface, const char *name, ...) { + _cleanup_strv_free_ char **names = NULL; va_list ap; - int r; - if (!bus) - return -EINVAL; - if (!BUS_IS_OPEN(bus->state)) - return -ENOTCONN; - if (bus_pid_changed(bus)) - return -ECHILD; + va_start(ap, name); + names = strv_new_ap(name, ap); + va_end(ap); - r = sd_bus_message_new_signal(bus, path, interface, member, &m); - if (r < 0) - return r; + if (!names) + return -ENOMEM; - va_start(ap, types); - r = bus_message_append_ap(m, types, ap); - va_end(ap); - if (r < 0) - return r; + return sd_bus_emit_properties_changed_strv(bus, path, interface, names); +} - return sd_bus_send(bus, m, NULL); +int sd_bus_emit_interfaces_added(sd_bus *bus, const char *path, const char *interfaces, ...) { + return -ENOSYS; } -int sd_bus_call_method( +int sd_bus_emit_interfaces_removed(sd_bus *bus, const char *path, const char *interfaces, ...) { + return -ENOSYS; +} + +int sd_bus_get_property( sd_bus *bus, const char *destination, const char *path, @@ -2507,108 +4282,115 @@ int sd_bus_call_method( const char *member, sd_bus_error *error, sd_bus_message **reply, - const char *types, ...) { + const char *type) { - _cleanup_bus_message_unref_ sd_bus_message *m = NULL; - va_list ap; + sd_bus_message *rep = NULL; int r; - if (!bus) + if (interface && !interface_name_is_valid(interface)) + return -EINVAL; + if (!member_name_is_valid(member)) + return -EINVAL; + if (!signature_is_single(type, false)) + return -EINVAL; + if (!reply) return -EINVAL; - if (!BUS_IS_OPEN(bus->state)) - return -ENOTCONN; - if (bus_pid_changed(bus)) - return -ECHILD; - r = sd_bus_message_new_method_call(bus, destination, path, interface, member, &m); + r = sd_bus_call_method(bus, destination, path, "org.freedesktop.DBus.Properties", "Get", error, &rep, "ss", strempty(interface), member); if (r < 0) return r; - va_start(ap, types); - r = bus_message_append_ap(m, types, ap); - va_end(ap); - if (r < 0) + r = sd_bus_message_enter_container(rep, 'v', type); + if (r < 0) { + sd_bus_message_unref(rep); return r; + } - return sd_bus_send_with_reply_and_block(bus, m, 0, error, reply); + *reply = rep; + return 0; } -int sd_bus_reply_method_return( +int sd_bus_set_property( sd_bus *bus, - sd_bus_message *call, - const char *types, ...) { + const char *destination, + const char *path, + const char *interface, + const char *member, + sd_bus_error *error, + const char *type, ...) { _cleanup_bus_message_unref_ sd_bus_message *m = NULL; va_list ap; int r; - if (!bus) + if (interface && !interface_name_is_valid(interface)) return -EINVAL; - if (!call) + if (!member_name_is_valid(member)) return -EINVAL; - if (!call->sealed) - return -EPERM; - if (call->header->type != SD_BUS_MESSAGE_TYPE_METHOD_CALL) + if (!signature_is_single(type, false)) return -EINVAL; - if (!BUS_IS_OPEN(bus->state)) - return -ENOTCONN; - if (bus_pid_changed(bus)) - return -ECHILD; - if (call->header->flags & SD_BUS_MESSAGE_NO_REPLY_EXPECTED) - return 0; + r = sd_bus_message_new_method_call(bus, destination, path, "org.freedesktop.DBus.Properties", "Set", &m); + if (r < 0) + return r; - r = sd_bus_message_new_method_return(bus, call, &m); + r = sd_bus_message_append(m, "ss", strempty(interface), member); + if (r < 0) + return r; + + r = sd_bus_message_open_container(m, 'v', type); if (r < 0) return r; - va_start(ap, types); - r = bus_message_append_ap(m, types, ap); + va_start(ap, type); + r = bus_message_append_ap(m, type, ap); va_end(ap); if (r < 0) return r; - return sd_bus_send(bus, m, NULL); -} + r = sd_bus_message_close_container(m); + if (r < 0) + return r; -int sd_bus_reply_method_error( - sd_bus *bus, - sd_bus_message *call, - const sd_bus_error *e) { + return sd_bus_send_with_reply_and_block(bus, m, 0, error, NULL); +} - _cleanup_bus_message_unref_ sd_bus_message *m = NULL; - int r; +int sd_bus_add_object_manager(sd_bus *bus, const char *path) { + struct node *n; if (!bus) return -EINVAL; - if (!call) - return -EINVAL; - if (!call->sealed) - return -EPERM; - if (call->header->type != SD_BUS_MESSAGE_TYPE_METHOD_CALL) - return -EINVAL; - if (!sd_bus_error_is_set(e)) + if (!object_path_is_valid(path)) return -EINVAL; - if (!BUS_IS_OPEN(bus->state)) - return -ENOTCONN; if (bus_pid_changed(bus)) return -ECHILD; - if (call->header->flags & SD_BUS_MESSAGE_NO_REPLY_EXPECTED) - return 0; - - r = sd_bus_message_new_method_error(bus, call, e, &m); - if (r < 0) - return r; + n = bus_node_allocate(bus, path); + if (!n) + return -ENOMEM; - return sd_bus_send(bus, m, NULL); + n->object_manager = true; + return 0; } -bool bus_pid_changed(sd_bus *bus) { - assert(bus); +int sd_bus_remove_object_manager(sd_bus *bus, const char *path) { + struct node *n; - /* We don't support people creating a bus connection and - * keeping it around over a fork(). Let's complain. */ + if (!bus) + return -EINVAL; + if (!object_path_is_valid(path)) + return -EINVAL; + if (bus_pid_changed(bus)) + return -ECHILD; - return bus->original_pid != getpid(); + n = hashmap_get(bus->nodes, path); + if (!n) + return 0; + + if (!n->object_manager) + return 0; + + n->object_manager = false; + bus_node_gc(bus, n); + return 1; }