--- /dev/null
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+ This file is part of systemd.
+
+ Copyright 2013 Lennart Poettering
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 of the License, or
+ (at your option) any later version.
+
+ systemd is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <sys/capability.h>
+
+#include "strv.h"
+#include "set.h"
+#include "bus-internal.h"
+#include "bus-message.h"
+#include "bus-type.h"
+#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,
+ const char *path,
+ struct node_vtable *c,
+ void **userdata,
+ sd_bus_error *error) {
+
+ void *u;
+ int r;
+
+ assert(bus);
+ assert(path);
+ assert(c);
+
+ u = c->userdata;
+ if (c->find) {
+ r = c->find(bus, path, c->interface, u, &u, error);
+ if (r < 0)
+ return r;
+ if (sd_bus_error_is_set(error))
+ return -sd_bus_error_get_errno(error);
+ if (r == 0)
+ return r;
+ }
+
+ if (userdata)
+ *userdata = u;
+
+ return 1;
+}
+
+static void *vtable_property_convert_userdata(const sd_bus_vtable *p, void *u) {
+ assert(p);
+
+ return (uint8_t*) u + p->x.property.offset;
+}
+
+static int vtable_property_get_userdata(
+ sd_bus *bus,
+ const char *path,
+ struct vtable_member *p,
+ void **userdata,
+ sd_bus_error *error) {
+
+ void *u;
+ int r;
+
+ assert(bus);
+ assert(path);
+ assert(p);
+ assert(userdata);
+
+ r = node_vtable_get_userdata(bus, path, p->parent, &u, error);
+ if (r <= 0)
+ return r;
+ if (bus->nodes_modified)
+ return 0;
+
+ *userdata = vtable_property_convert_userdata(p->vtable, u);
+ return 1;
+}
+
+static int add_enumerated_to_set(
+ sd_bus *bus,
+ const char *prefix,
+ struct node_enumerator *first,
+ Set *s,
+ sd_bus_error *error) {
+
+ struct node_enumerator *c;
+ int r;
+
+ assert(bus);
+ assert(prefix);
+ assert(s);
+
+ LIST_FOREACH(enumerators, c, first) {
+ char **children = NULL, **k;
+
+ if (bus->nodes_modified)
+ return 0;
+
+ r = c->callback(bus, prefix, c->userdata, &children, error);
+ if (r < 0)
+ return r;
+ if (sd_bus_error_is_set(error))
+ return -sd_bus_error_get_errno(error);
+
+ STRV_FOREACH(k, children) {
+ if (r < 0) {
+ free(*k);
+ continue;
+ }
+
+ if (!object_path_is_valid(*k)){
+ free(*k);
+ r = -EINVAL;
+ continue;
+ }
+
+ if (!object_path_startswith(*k, prefix)) {
+ free(*k);
+ continue;
+ }
+
+ r = set_consume(s, *k);
+ if (r == -EEXIST)
+ r = 0;
+ }
+
+ free(children);
+ if (r < 0)
+ return r;
+ }
+
+ return 0;
+}
+
+static int add_subtree_to_set(
+ sd_bus *bus,
+ const char *prefix,
+ struct node *n,
+ Set *s,
+ sd_bus_error *error) {
+
+ struct node *i;
+ int r;
+
+ assert(bus);
+ assert(prefix);
+ assert(n);
+ assert(s);
+
+ r = add_enumerated_to_set(bus, prefix, n->enumerators, s, error);
+ if (r < 0)
+ return r;
+ if (bus->nodes_modified)
+ return 0;
+
+ LIST_FOREACH(siblings, i, n->child) {
+ char *t;
+
+ if (!object_path_startswith(i->path, prefix))
+ continue;
+
+ 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, error);
+ if (r < 0)
+ return r;
+ if (bus->nodes_modified)
+ return 0;
+ }
+
+ return 0;
+}
+
+static int get_child_nodes(
+ sd_bus *bus,
+ const char *prefix,
+ struct node *n,
+ Set **_s,
+ sd_bus_error *error) {
+
+ Set *s = NULL;
+ int r;
+
+ assert(bus);
+ assert(prefix);
+ assert(n);
+ assert(_s);
+
+ s = set_new(string_hash_func, string_compare_func);
+ if (!s)
+ return -ENOMEM;
+
+ r = add_subtree_to_set(bus, prefix, n, s, error);
+ 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);
+
+ LIST_FOREACH(callbacks, c, first) {
+ _cleanup_bus_error_free_ sd_bus_error error_buffer = SD_BUS_ERROR_NULL;
+
+ if (bus->nodes_modified)
+ return 0;
+
+ if (require_fallback && !c->is_fallback)
+ continue;
+
+ *found_object = true;
+
+ if (c->last_iteration == bus->iteration_counter)
+ continue;
+
+ c->last_iteration = bus->iteration_counter;
+
+ r = sd_bus_message_rewind(m, true);
+ if (r < 0)
+ return r;
+
+ r = c->callback(bus, m, c->userdata, &error_buffer);
+ r = bus_maybe_reply_error(m, r, &error_buffer);
+ if (r != 0)
+ return r;
+ }
+
+ return 0;
+}
+
+#define CAPABILITY_SHIFT(x) (((x) >> __builtin_ctzll(_SD_BUS_VTABLE_CAPABILITY_MASK)) & 0xFFFF)
+
+static int check_access(sd_bus *bus, sd_bus_message *m, struct vtable_member *c, sd_bus_error *error) {
+ _cleanup_bus_creds_unref_ sd_bus_creds *creds = NULL;
+ uint64_t cap;
+ uid_t uid;
+ int r;
+
+ assert(bus);
+ assert(m);
+ assert(c);
+
+ /* If the entire bus is trusted let's grant access */
+ if (bus->trusted)
+ return 0;
+
+ /* If the member is marked UNPRIVILEGED let's grant access */
+ if (c->vtable->flags & SD_BUS_VTABLE_UNPRIVILEGED)
+ return 0;
+
+ /* If we are not connected to kdbus we cannot retrieve the
+ * effective capability set without race. Since we need this
+ * for a security decision we cannot use racy data, hence
+ * don't request it. */
+ if (bus->is_kernel)
+ r = sd_bus_query_sender_creds(m, SD_BUS_CREDS_UID|SD_BUS_CREDS_EFFECTIVE_CAPS, &creds);
+ else
+ r = sd_bus_query_sender_creds(m, SD_BUS_CREDS_UID, &creds);
+ if (r < 0)
+ return r;
+
+ /* Check have the caller has the requested capability
+ * set. Note that the flags value contains the capability
+ * number plus one, which we need to subtract here. We do this
+ * so that we have 0 as special value for "default
+ * capability". */
+ cap = CAPABILITY_SHIFT(c->vtable->flags);
+ if (cap == 0)
+ cap = CAPABILITY_SHIFT(c->parent->vtable[0].flags);
+ if (cap == 0)
+ cap = CAP_SYS_ADMIN;
+ else
+ cap --;
+
+ r = sd_bus_creds_has_effective_cap(creds, cap);
+ if (r > 0)
+ return 1;
+
+ /* Caller has same UID as us, then let's grant access */
+ r = sd_bus_creds_get_uid(creds, &uid);
+ if (r >= 0) {
+ if (uid == getuid())
+ return 1;
+ }
+
+ return sd_bus_error_setf(error, SD_BUS_ERROR_ACCESS_DENIED, "Access to %s.%s() not permitted.", c->interface, c->member);
+}
+
+static int method_callbacks_run(
+ sd_bus *bus,
+ sd_bus_message *m,
+ struct vtable_member *c,
+ bool require_fallback,
+ bool *found_object) {
+
+ _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
+ const char *signature;
+ void *u;
+ int r;
+
+ assert(bus);
+ assert(m);
+ assert(c);
+ assert(found_object);
+
+ if (require_fallback && !c->parent->is_fallback)
+ return 0;
+
+ r = check_access(bus, m, c, &error);
+ if (r < 0)
+ return bus_maybe_reply_error(m, r, &error);
+
+ r = node_vtable_get_userdata(bus, m->path, c->parent, &u, &error);
+ if (r <= 0)
+ return bus_maybe_reply_error(m, r, &error);
+ if (bus->nodes_modified)
+ return 0;
+
+ *found_object = true;
+
+ if (c->last_iteration == bus->iteration_counter)
+ return 0;
+
+ c->last_iteration = bus->iteration_counter;
+
+ r = sd_bus_message_rewind(m, true);
+ 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))
+ return sd_bus_reply_method_errorf(
+ m,
+ 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));
+
+ /* Keep track what the signature of the reply to this message
+ * should be, so that this can be enforced when sealing the
+ * reply. */
+ m->enforced_reply_signature = strempty(c->vtable->x.method.result);
+
+ if (c->vtable->x.method.handler) {
+ r = c->vtable->x.method.handler(bus, m, u, &error);
+ return bus_maybe_reply_error(m, r, &error);
+ }
+
+ /* If the method callback is NULL, make this a successful NOP */
+ r = sd_bus_reply_method_return(m, NULL);
+ if (r < 0)
+ return r;
+
+ return 1;
+}
+
+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 *reply,
+ void *userdata,
+ sd_bus_error *error) {
+
+ const void *p;
+ int r;
+
+ assert(bus);
+ assert(v);
+ assert(path);
+ assert(interface);
+ assert(property);
+ assert(reply);
+
+ if (v->x.property.get) {
+ r = v->x.property.get(bus, path, interface, property, reply, userdata, error);
+ if (r < 0)
+ return r;
+ if (sd_bus_error_is_set(error))
+ return -sd_bus_error_get_errno(error);
+ return r;
+ }
+
+ /* Automatic handling if no callback is defined. */
+
+ if (streq(v->x.property.signature, "as"))
+ return sd_bus_message_append_strv(reply, *(char***) userdata);
+
+ assert(signature_is_single(v->x.property.signature, false));
+ assert(bus_type_is_basic(v->x.property.signature[0]));
+
+ switch (v->x.property.signature[0]) {
+
+ case SD_BUS_TYPE_STRING:
+ case SD_BUS_TYPE_SIGNATURE:
+ p = strempty(*(char**) userdata);
+ break;
+
+ case SD_BUS_TYPE_OBJECT_PATH:
+ p = *(char**) userdata;
+ assert(p);
+ break;
+
+ default:
+ p = userdata;
+ break;
+ }
+
+ return sd_bus_message_append_basic(reply, v->x.property.signature[0], p);
+}
+
+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,
+ void *userdata,
+ sd_bus_error *error) {
+
+ int r;
+
+ assert(bus);
+ assert(v);
+ assert(path);
+ assert(interface);
+ assert(property);
+ assert(value);
+
+ if (v->x.property.set) {
+ r = v->x.property.set(bus, path, interface, property, value, userdata, error);
+ if (r < 0)
+ return r;
+ if (sd_bus_error_is_set(error))
+ return -sd_bus_error_get_errno(error);
+ return r;
+ }
+
+ /* Automatic handling if no callback is defined. */
+
+ assert(signature_is_single(v->x.property.signature, false));
+ assert(bus_type_is_basic(v->x.property.signature[0]));
+
+ switch (v->x.property.signature[0]) {
+
+ 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->x.property.signature[0], &p);
+ if (r < 0)
+ return r;
+
+ n = strdup(p);
+ if (!n)
+ return -ENOMEM;
+
+ free(*(char**) userdata);
+ *(char**) userdata = n;
+
+ break;
+ }
+
+ default:
+ r = sd_bus_message_read_basic(value, v->x.property.signature[0], userdata);
+ if (r < 0)
+ return r;
+
+ break;
+ }
+
+ return 1;
+}
+
+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_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
+ _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
+ void *u;
+ int r;
+
+ assert(bus);
+ assert(m);
+ assert(c);
+ assert(found_object);
+
+ if (require_fallback && !c->parent->is_fallback)
+ return 0;
+
+ r = vtable_property_get_userdata(bus, m->path, c, &u, &error);
+ if (r <= 0)
+ return bus_maybe_reply_error(m, r, &error);
+ if (bus->nodes_modified)
+ return 0;
+
+ *found_object = true;
+
+ r = sd_bus_message_new_method_return(m, &reply);
+ if (r < 0)
+ return r;
+
+ if (is_get) {
+ /* Note that we do not protect against reexecution
+ * here (using the last_iteration check, see below),
+ * should the node tree have changed and we got called
+ * again. We assume that property Get() calls are
+ * ultimately without side-effects or if they aren't
+ * then at least idempotent. */
+
+ r = sd_bus_message_open_container(reply, 'v', c->vtable->x.property.signature);
+ if (r < 0)
+ return r;
+
+ /* Note that we do not do an access check here. Read
+ * access to properties is always unrestricted, since
+ * PropertiesChanged signals broadcast contents
+ * anyway. */
+
+ r = invoke_property_get(bus, c->vtable, m->path, c->interface, c->member, reply, u, &error);
+ if (r < 0)
+ return bus_maybe_reply_error(m, r, &error);
+
+ if (bus->nodes_modified)
+ return 0;
+
+ r = sd_bus_message_close_container(reply);
+ if (r < 0)
+ return r;
+
+ } else {
+ if (c->vtable->type != _SD_BUS_VTABLE_WRITABLE_PROPERTY)
+ return sd_bus_reply_method_errorf(m, SD_BUS_ERROR_PROPERTY_READ_ONLY, "Property '%s' is not writable.", c->member);
+
+ /* Avoid that we call the set routine more than once
+ * if the processing of this message got restarted
+ * because the node tree changed. */
+ if (c->last_iteration == bus->iteration_counter)
+ return 0;
+
+ c->last_iteration = bus->iteration_counter;
+
+ r = sd_bus_message_enter_container(m, 'v', c->vtable->x.property.signature);
+ if (r < 0)
+ return r;
+
+ r = check_access(bus, m, c, &error);
+ if (r < 0)
+ return bus_maybe_reply_error(m, r, &error);
+
+ r = invoke_property_set(bus, c->vtable, m->path, c->interface, c->member, m, u, &error);
+ if (r < 0)
+ return bus_maybe_reply_error(m, r, &error);
+
+ if (bus->nodes_modified)
+ return 0;
+
+ 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_one_property(
+ sd_bus *bus,
+ sd_bus_message *reply,
+ const char *path,
+ struct node_vtable *c,
+ const sd_bus_vtable *v,
+ void *userdata,
+ sd_bus_error *error) {
+
+ int r;
+
+ assert(bus);
+ assert(reply);
+ assert(path);
+ assert(c);
+ assert(v);
+
+ r = sd_bus_message_open_container(reply, 'e', "sv");
+ if (r < 0)
+ return r;
+
+ r = sd_bus_message_append(reply, "s", v->x.property.member);
+ if (r < 0)
+ return r;
+
+ r = sd_bus_message_open_container(reply, 'v', v->x.property.signature);
+ if (r < 0)
+ return r;
+
+ r = invoke_property_get(bus, v, path, c->interface, v->x.property.member, reply, vtable_property_convert_userdata(v, userdata), error);
+ if (r < 0)
+ return r;
+ if (bus->nodes_modified)
+ 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 0;
+}
+
+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(path);
+ assert(c);
+
+ if (c->vtable[0].flags & SD_BUS_VTABLE_HIDDEN)
+ return 1;
+
+ 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;
+
+ if (v->flags & SD_BUS_VTABLE_HIDDEN)
+ continue;
+
+ r = vtable_append_one_property(bus, reply, path, c, v, userdata, error);
+ if (r < 0)
+ return r;
+ if (bus->nodes_modified)
+ return 0;
+ }
+
+ 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;
+ int r;
+
+ assert(bus);
+ assert(m);
+ assert(found_object);
+
+ r = sd_bus_message_new_method_return(m, &reply);
+ if (r < 0)
+ return r;
+
+ r = sd_bus_message_open_container(reply, 'a', "{sv}");
+ if (r < 0)
+ return r;
+
+ found_interface = !iface ||
+ 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;
+
+ if (require_fallback && !c->is_fallback)
+ continue;
+
+ r = node_vtable_get_userdata(bus, m->path, c, &u, &error);
+ if (r < 0)
+ return bus_maybe_reply_error(m, r, &error);
+ if (bus->nodes_modified)
+ return 0;
+ if (r == 0)
+ continue;
+
+ *found_object = true;
+
+ if (iface && !streq(c->interface, iface))
+ continue;
+ found_interface = true;
+
+ r = vtable_append_all_properties(bus, reply, m->path, c, u, &error);
+ if (r < 0)
+ return bus_maybe_reply_error(m, r, &error);
+ if (bus->nodes_modified)
+ return 0;
+ }
+
+ if (!found_interface) {
+ r = sd_bus_reply_method_errorf(
+ m,
+ SD_BUS_ERROR_UNKNOWN_INTERFACE,
+ "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);
+ assert(n);
+
+ 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);
+ assert(path);
+
+ /* 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) {
+ _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
+
+ if (require_fallback && !c->is_fallback)
+ continue;
+
+ if (node_vtable_get_userdata(bus, path, c, NULL, &error) > 0)
+ return true;
+ if (bus->nodes_modified)
+ return false;
+ }
+
+ 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_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
+ _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
+ _cleanup_set_free_free_ Set *s = NULL;
+ const char *previous_interface = 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, &error);
+ if (r < 0)
+ return bus_maybe_reply_error(m, r, &error);
+ if (bus->nodes_modified)
+ return 0;
+
+ r = introspect_begin(&intro, bus->trusted);
+ 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, &error);
+ if (r < 0) {
+ r = bus_maybe_reply_error(m, r, &error);
+ goto finish;
+ }
+ if (bus->nodes_modified) {
+ r = 0;
+ goto finish;
+ }
+ if (r == 0)
+ continue;
+
+ empty = false;
+
+ if (c->vtable[0].flags & SD_BUS_VTABLE_HIDDEN)
+ continue;
+
+ if (!streq_ptr(previous_interface, c->interface)) {
+
+ if (previous_interface)
+ fputs(" </interface>\n", intro.f);
+
+ fprintf(intro.f, " <interface name=\"%s\">\n", c->interface);
+ }
+
+ r = introspect_write_interface(&intro, c->vtable);
+ if (r < 0)
+ goto finish;
+
+ previous_interface = c->interface;
+ }
+
+ if (previous_interface)
+ fputs(" </interface>\n", intro.f);
+
+ 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 (bus->nodes_modified)
+ return 0;
+ 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_path(
+ sd_bus *bus,
+ sd_bus_message *reply,
+ const char *prefix,
+ const char *path,
+ bool require_fallback,
+ sd_bus_error *error) {
+
+ const char *previous_interface = NULL;
+ bool found_something = false;
+ 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;
+
+ LIST_FOREACH(vtables, i, n->vtables) {
+ void *u;
+
+ if (require_fallback && !i->is_fallback)
+ continue;
+
+ r = node_vtable_get_userdata(bus, path, i, &u, error);
+ if (r < 0)
+ return r;
+ if (bus->nodes_modified)
+ return 0;
+ if (r == 0)
+ continue;
+
+ if (!found_something) {
+
+ /* Open the object part */
+
+ 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;
+
+ found_something = true;
+ }
+
+ if (!streq_ptr(previous_interface, i->interface)) {
+
+ /* Maybe close the previous interface part */
+
+ if (previous_interface) {
+ r = sd_bus_message_close_container(reply);
+ if (r < 0)
+ return r;
+
+ r = sd_bus_message_close_container(reply);
+ if (r < 0)
+ return r;
+ }
+
+ /* Open the new interface part */
+
+ r = sd_bus_message_open_container(reply, 'e', "sa{sv}");
+ if (r < 0)
+ return r;
+
+ r = sd_bus_message_append(reply, "s", i->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, i, u, error);
+ if (r < 0)
+ return r;
+ if (bus->nodes_modified)
+ return 0;
+
+ previous_interface = i->interface;
+ }
+
+ if (previous_interface) {
+ r = sd_bus_message_close_container(reply);
+ if (r < 0)
+ return r;
+
+ r = sd_bus_message_close_container(reply);
+ if (r < 0)
+ return r;
+ }
+
+ if (found_something) {
+ 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) {
+
+ char *prefix;
+ 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 (bus->nodes_modified)
+ return 0;
+
+ /* Second, add fallback vtables registered for any of the prefixes */
+ prefix = alloca(strlen(path) + 1);
+ OBJECT_PATH_FOREACH_PREFIX(prefix, path) {
+ r = object_manager_serialize_path(bus, reply, prefix, path, true, error);
+ if (r < 0)
+ return r;
+ if (bus->nodes_modified)
+ 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_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
+ _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, &error);
+ if (r < 0)
+ return r;
+ if (bus->nodes_modified)
+ return 0;
+
+ r = sd_bus_message_new_method_return(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) {
+ r = object_manager_serialize_path_and_fallbacks(bus, reply, path, &error);
+ if (r < 0)
+ return r;
+
+ if (bus->nodes_modified)
+ return 0;
+ }
+ }
+
+ 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 (bus->nodes_modified)
+ return 0;
+
+ 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;
+ if (bus->nodes_modified)
+ return 0;
+ }
+
+ /* 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 sd_bus_reply_method_errorf(m, SD_BUS_ERROR_INVALID_ARGS, "Expected interface and member parameters");
+
+ 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 sd_bus_reply_method_errorf(m, SD_BUS_ERROR_INVALID_ARGS, "Expected interface parameter");
+
+ 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")) {
+
+ if (!isempty(sd_bus_message_get_signature(m, true)))
+ return sd_bus_reply_method_errorf(m, SD_BUS_ERROR_INVALID_ARGS, "Expected no parameters");
+
+ 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")) {
+
+ if (!isempty(sd_bus_message_get_signature(m, true)))
+ return sd_bus_reply_method_errorf(m, SD_BUS_ERROR_INVALID_ARGS, "Expected no parameters");
+
+ r = process_get_managed_objects(bus, m, n, require_fallback, found_object);
+ if (r != 0)
+ return r;
+ }
+
+ if (bus->nodes_modified)
+ return 0;
+
+ 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;
+}
+
+int bus_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_METHOD_CALL)
+ return 0;
+
+ if (hashmap_isempty(bus->nodes))
+ return 0;
+
+ /* Never respond to broadcast messages */
+ if (bus->bus_client && !m->destination)
+ return 0;
+
+ assert(m->path);
+ assert(m->member);
+
+ pl = strlen(m->path);
+ do {
+ char prefix[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 */
+ OBJECT_PATH_FOREACH_PREFIX(prefix, m->path) {
+
+ if (bus->nodes_modified)
+ break;
+
+ r = object_find_and_run(bus, m, prefix, 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(
+ m,
+ SD_BUS_ERROR_UNKNOWN_PROPERTY,
+ "Unknown property or interface.");
+ else
+ r = sd_bus_reply_method_errorf(
+ m,
+ SD_BUS_ERROR_UNKNOWN_METHOD,
+ "Unknown method '%s' or interface '%s'.", m->member, m->interface);
+
+ if (r < 0)
+ return r;
+
+ return 1;
+}
+
+static struct node *bus_node_allocate(sd_bus *bus, const char *path) {
+ struct node *n, *parent;
+ const char *e;
+ _cleanup_free_ char *s = NULL;
+ char *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)
+ return NULL;
+ }
+
+ n = new0(struct node, 1);
+ if (!n)
+ return NULL;
+
+ n->parent = parent;
+ n->path = s;
+ s = NULL; /* do not free */
+
+ r = hashmap_put(bus->nodes, n->path, n);
+ if (r < 0) {
+ free(n->path);
+ free(n);
+ return NULL;
+ }
+
+ if (parent)
+ LIST_PREPEND(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(siblings, n->parent->child, n);
+
+ free(n->path);
+ bus_node_gc(b, n->parent);
+ free(n);
+}
+
+static int bus_add_object(
+ sd_bus *bus,
+ bool fallback,
+ const char *path,
+ sd_bus_message_handler_t callback,
+ void *userdata) {
+
+ struct node_callback *c;
+ struct node *n;
+ int r;
+
+ assert_return(bus, -EINVAL);
+ assert_return(object_path_is_valid(path), -EINVAL);
+ assert_return(callback, -EINVAL);
+ assert_return(!bus_pid_changed(bus), -ECHILD);
+
+ n = bus_node_allocate(bus, 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(callbacks, n->callbacks, c);
+ bus->nodes_modified = true;
+
+ return 0;
+
+fail:
+ free(c);
+ bus_node_gc(bus, n);
+ return r;
+}
+
+static int bus_remove_object(
+ sd_bus *bus,
+ bool fallback,
+ const char *path,
+ sd_bus_message_handler_t callback,
+ void *userdata) {
+
+ struct node_callback *c;
+ struct node *n;
+
+ assert_return(bus, -EINVAL);
+ assert_return(object_path_is_valid(path), -EINVAL);
+ assert_return(callback, -EINVAL);
+ assert_return(!bus_pid_changed(bus), -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(callbacks, n->callbacks, c);
+ free(c);
+
+ bus_node_gc(bus, n);
+ bus->nodes_modified = true;
+
+ return 1;
+}
+
+_public_ 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);
+}
+
+_public_ 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);
+}
+
+_public_ 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);
+}
+
+_public_ 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);
+}
+
+static void free_node_vtable(sd_bus *bus, struct node_vtable *w) {
+ assert(bus);
+
+ if (!w)
+ return;
+
+ if (w->interface && w->node && w->vtable) {
+ const sd_bus_vtable *v;
+
+ for (v = w->vtable; v->type != _SD_BUS_VTABLE_END; v++) {
+ struct vtable_member *x = NULL;
+
+ switch (v->type) {
+
+ case _SD_BUS_VTABLE_METHOD: {
+ struct vtable_member key;
+
+ key.path = w->node->path;
+ key.interface = w->interface;
+ key.member = v->x.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->x.property.member;
+ x = hashmap_remove(bus->vtable_properties, &key);
+ break;
+ }}
+
+ free(x);
+ }
+ }
+
+ free(w->interface);
+ free(w);
+}
+
+static unsigned long vtable_member_hash_func(const void *a, const uint8_t hash_key[HASH_KEY_SIZE]) {
+ const struct vtable_member *m = a;
+ uint8_t hash_key2[HASH_KEY_SIZE];
+ unsigned long ret;
+
+ assert(m);
+
+ ret = string_hash_func(m->path, hash_key);
+
+ /* Use a slightly different hash key for the interface */
+ memcpy(hash_key2, hash_key, HASH_KEY_SIZE);
+ hash_key2[0]++;
+ ret ^= string_hash_func(m->interface, hash_key2);
+
+ /* And an even different one for the member */
+ hash_key2[0]++;
+ ret ^= string_hash_func(m->member, hash_key2);
+
+ return ret;
+}
+
+static int vtable_member_compare_func(const void *a, const void *b) {
+ const struct vtable_member *x = a, *y = b;
+ int r;
+
+ assert(x);
+ assert(y);
+
+ r = strcmp(x->path, y->path);
+ if (r != 0)
+ return r;
+
+ r = strcmp(x->interface, y->interface);
+ if (r != 0)
+ return r;
+
+ return strcmp(x->member, y->member);
+}
+
+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, *existing = NULL;
+ const sd_bus_vtable *v;
+ struct node *n;
+ int r;
+
+ assert_return(bus, -EINVAL);
+ assert_return(object_path_is_valid(path), -EINVAL);
+ assert_return(interface_name_is_valid(interface), -EINVAL);
+ assert_return(vtable, -EINVAL);
+ assert_return(vtable[0].type == _SD_BUS_VTABLE_START, -EINVAL);
+ assert_return(vtable[0].x.start.element_size == sizeof(struct sd_bus_vtable), -EINVAL);
+ assert_return(!bus_pid_changed(bus), -ECHILD);
+ assert_return(!streq(interface, "org.freedesktop.DBus.Properties") &&
+ !streq(interface, "org.freedesktop.DBus.Introspectable") &&
+ !streq(interface, "org.freedesktop.DBus.Peer") &&
+ !streq(interface, "org.freedesktop.DBus.ObjectManager"), -EINVAL);
+
+ r = hashmap_ensure_allocated(&bus->vtable_methods, vtable_member_hash_func, vtable_member_compare_func);
+ if (r < 0)
+ return r;
+
+ r = hashmap_ensure_allocated(&bus->vtable_properties, vtable_member_hash_func, vtable_member_compare_func);
+ if (r < 0)
+ return r;
+
+ n = bus_node_allocate(bus, path);
+ if (!n)
+ return -ENOMEM;
+
+ LIST_FOREACH(vtables, i, n->vtables) {
+ if (i->is_fallback != fallback) {
+ r = -EPROTOTYPE;
+ goto fail;
+ }
+
+ if (streq(i->interface, interface)) {
+
+ if (i->vtable == vtable) {
+ r = -EEXIST;
+ goto fail;
+ }
+
+ existing = i;
+ }
+ }
+
+ c = new0(struct node_vtable, 1);
+ if (!c) {
+ r = -ENOMEM;
+ goto fail;
+ }
+
+ c->node = n;
+ c->is_fallback = fallback;
+ c->vtable = vtable;
+ c->userdata = userdata;
+ c->find = find;
+
+ c->interface = strdup(interface);
+ if (!c->interface) {
+ r = -ENOMEM;
+ goto fail;
+ }
+
+ 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->x.method.member) ||
+ !signature_is_valid(strempty(v->x.method.signature), false) ||
+ !signature_is_valid(strempty(v->x.method.result), false) ||
+ !(v->x.method.handler || (isempty(v->x.method.signature) && isempty(v->x.method.result))) ||
+ v->flags & (SD_BUS_VTABLE_PROPERTY_CONST|SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE|SD_BUS_VTABLE_PROPERTY_EMITS_INVALIDATION)) {
+ 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->x.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->x.property.set || bus_type_is_basic(v->x.property.signature[0]))) {
+ r = -EINVAL;
+ goto fail;
+ }
+
+ /* Fall through */
+
+ case _SD_BUS_VTABLE_PROPERTY: {
+ struct vtable_member *m;
+
+ if (!member_name_is_valid(v->x.property.member) ||
+ !signature_is_single(v->x.property.signature, false) ||
+ !(v->x.property.get || bus_type_is_basic(v->x.property.signature[0]) || streq(v->x.property.signature, "as")) ||
+ v->flags & SD_BUS_VTABLE_METHOD_NO_REPLY ||
+ (!!(v->flags & SD_BUS_VTABLE_PROPERTY_CONST) + !!(v->flags & SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE) + !!(v->flags & SD_BUS_VTABLE_PROPERTY_EMITS_INVALIDATION)) > 1 ||
+ (v->flags & SD_BUS_VTABLE_UNPRIVILEGED && v->type == _SD_BUS_VTABLE_PROPERTY)) {
+ 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->x.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->x.signal.member) ||
+ !signature_is_valid(strempty(v->x.signal.signature), false) ||
+ v->flags & SD_BUS_VTABLE_UNPRIVILEGED) {
+ r = -EINVAL;
+ goto fail;
+ }
+
+ break;
+
+ default:
+ r = -EINVAL;
+ goto fail;
+ }
+ }
+
+ LIST_INSERT_AFTER(vtables, n->vtables, existing, c);
+ bus->nodes_modified = true;
+
+ return 0;
+
+fail:
+ if (c)
+ free_node_vtable(bus, c);
+
+ bus_node_gc(bus, n);
+ return r;
+}
+
+static int remove_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;
+ struct node *n;
+
+ assert_return(bus, -EINVAL);
+ assert_return(object_path_is_valid(path), -EINVAL);
+ assert_return(interface_name_is_valid(interface), -EINVAL);
+ assert_return(!bus_pid_changed(bus), -ECHILD);
+
+ n = hashmap_get(bus->nodes, path);
+ if (!n)
+ return 0;
+
+ LIST_FOREACH(vtables, c, n->vtables)
+ if (streq(c->interface, interface) &&
+ c->is_fallback == fallback &&
+ c->vtable == vtable &&
+ c->find == find &&
+ c->userdata == userdata)
+ break;
+
+ if (!c)
+ return 0;
+
+ LIST_REMOVE(vtables, n->vtables, c);
+
+ free_node_vtable(bus, c);
+ bus_node_gc(bus, n);
+
+ bus->nodes_modified = true;
+
+ return 1;
+}
+
+_public_ int sd_bus_add_object_vtable(
+ sd_bus *bus,
+ const char *path,
+ const char *interface,
+ const sd_bus_vtable *vtable,
+ void *userdata) {
+
+ return add_object_vtable_internal(bus, path, interface, vtable, false, NULL, userdata);
+}
+
+_public_ int sd_bus_remove_object_vtable(
+ sd_bus *bus,
+ const char *path,
+ const char *interface,
+ const sd_bus_vtable *vtable,
+ void *userdata) {
+
+ return remove_object_vtable_internal(bus, path, interface, vtable, false, NULL, userdata);
+}
+
+_public_ 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);
+}
+
+_public_ int sd_bus_remove_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 remove_object_vtable_internal(bus, path, interface, vtable, true, find, userdata);
+}
+
+_public_ int sd_bus_add_node_enumerator(
+ sd_bus *bus,
+ const char *path,
+ sd_bus_node_enumerator_t callback,
+ void *userdata) {
+
+ struct node_enumerator *c;
+ struct node *n;
+ int r;
+
+ assert_return(bus, -EINVAL);
+ assert_return(object_path_is_valid(path), -EINVAL);
+ assert_return(callback, -EINVAL);
+ assert_return(!bus_pid_changed(bus), -ECHILD);
+
+ n = bus_node_allocate(bus, path);
+ if (!n)
+ return -ENOMEM;
+
+ c = new0(struct node_enumerator, 1);
+ if (!c) {
+ r = -ENOMEM;
+ goto fail;
+ }
+
+ c->node = n;
+ c->callback = callback;
+ c->userdata = userdata;
+
+ LIST_PREPEND(enumerators, n->enumerators, c);
+
+ bus->nodes_modified = true;
+
+ return 0;
+
+fail:
+ free(c);
+ bus_node_gc(bus, n);
+ return r;
+}
+
+_public_ int sd_bus_remove_node_enumerator(
+ sd_bus *bus,
+ const char *path,
+ sd_bus_node_enumerator_t callback,
+ void *userdata) {
+
+ struct node_enumerator *c;
+ struct node *n;
+
+ assert_return(bus, -EINVAL);
+ assert_return(object_path_is_valid(path), -EINVAL);
+ assert_return(callback, -EINVAL);
+ assert_return(!bus_pid_changed(bus), -ECHILD);
+
+ n = hashmap_get(bus->nodes, path);
+ if (!n)
+ return 0;
+
+ LIST_FOREACH(enumerators, c, n->enumerators)
+ if (c->callback == callback && c->userdata == userdata)
+ break;
+
+ if (!c)
+ return 0;
+
+ LIST_REMOVE(enumerators, n->enumerators, c);
+ free(c);
+
+ bus_node_gc(bus, n);
+
+ bus->nodes_modified = true;
+
+ return 1;
+}
+
+static int emit_properties_changed_on_interface(
+ sd_bus *bus,
+ const char *prefix,
+ const char *path,
+ const char *interface,
+ bool require_fallback,
+ bool *found_interface,
+ char **names) {
+
+ _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
+ _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
+ bool has_invalidating = false, has_changing = false;
+ struct vtable_member key = {};
+ struct node_vtable *c;
+ struct node *n;
+ char **property;
+ void *u = NULL;
+ int r;
+
+ assert(bus);
+ assert(prefix);
+ assert(path);
+ assert(interface);
+ assert(found_interface);
+
+ n = hashmap_get(bus->nodes, prefix);
+ if (!n)
+ return 0;
+
+ r = sd_bus_message_new_signal(bus, path, "org.freedesktop.DBus.Properties", "PropertiesChanged", &m);
+ if (r < 0)
+ return r;
+
+ r = sd_bus_message_append(m, "s", interface);
+ if (r < 0)
+ return r;
+
+ r = sd_bus_message_open_container(m, 'a', "{sv}");
+ if (r < 0)
+ return r;
+
+ key.path = prefix;
+ key.interface = interface;
+
+ LIST_FOREACH(vtables, c, n->vtables) {
+ if (require_fallback && !c->is_fallback)
+ continue;
+
+ if (!streq(c->interface, interface))
+ continue;
+
+ r = node_vtable_get_userdata(bus, path, c, &u, &error);
+ if (r < 0)
+ return r;
+ if (bus->nodes_modified)
+ return 0;
+ if (r == 0)
+ continue;
+
+ *found_interface = true;
+
+ if (names) {
+ /* If the caller specified a list of
+ * properties we include exactly those in the
+ * PropertiesChanged message */
+
+ STRV_FOREACH(property, names) {
+ struct vtable_member *v;
+
+ assert_return(member_name_is_valid(*property), -EINVAL);
+
+ key.member = *property;
+ v = hashmap_get(bus->vtable_properties, &key);
+ if (!v)
+ return -ENOENT;
+
+ /* If there are two vtables for the same
+ * interface, let's handle this property when
+ * we come to that vtable. */
+ if (c != v->parent)
+ continue;
+
+ assert_return(v->vtable->flags & SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE ||
+ v->vtable->flags & SD_BUS_VTABLE_PROPERTY_EMITS_INVALIDATION, -EDOM);
+
+ assert_return(!(v->vtable->flags & SD_BUS_VTABLE_HIDDEN), -EDOM);
+
+ if (v->vtable->flags & SD_BUS_VTABLE_PROPERTY_EMITS_INVALIDATION) {
+ has_invalidating = true;
+ continue;
+ }
+
+ has_changing = true;
+
+ r = vtable_append_one_property(bus, m, m->path, c, v->vtable, u, &error);
+ if (r < 0)
+ return r;
+ if (bus->nodes_modified)
+ return 0;
+ }
+ } else {
+ const sd_bus_vtable *v;
+
+ /* If the caller specified no properties list
+ * we include all properties that are marked
+ * as changing in the message. */
+
+ 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;
+
+ if (v->flags & SD_BUS_VTABLE_HIDDEN)
+ continue;
+
+ if (v->flags & SD_BUS_VTABLE_PROPERTY_EMITS_INVALIDATION) {
+ has_invalidating = true;
+ continue;
+ }
+
+ if (!(v->flags & SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE))
+ continue;
+
+ has_changing = true;
+
+ r = vtable_append_one_property(bus, m, m->path, c, v, u, &error);
+ if (r < 0)
+ return r;
+ if (bus->nodes_modified)
+ return 0;
+ }
+ }
+ }
+
+ if (!has_invalidating && !has_changing)
+ return 0;
+
+ 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) {
+ LIST_FOREACH(vtables, c, n->vtables) {
+ if (require_fallback && !c->is_fallback)
+ continue;
+
+ if (!streq(c->interface, interface))
+ continue;
+
+ r = node_vtable_get_userdata(bus, path, c, &u, &error);
+ if (r < 0)
+ return r;
+ if (bus->nodes_modified)
+ return 0;
+ if (r == 0)
+ continue;
+
+ if (names) {
+ 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_EMITS_INVALIDATION))
+ continue;
+
+ r = sd_bus_message_append(m, "s", *property);
+ if (r < 0)
+ return r;
+ }
+ } else {
+ const sd_bus_vtable *v;
+
+ 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;
+
+ if (v->flags & SD_BUS_VTABLE_HIDDEN)
+ continue;
+
+ if (!(v->flags & SD_BUS_VTABLE_PROPERTY_EMITS_INVALIDATION))
+ continue;
+
+ r = sd_bus_message_append(m, "s", v->x.property.member);
+ if (r < 0)
+ 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;
+}
+
+_public_ int sd_bus_emit_properties_changed_strv(
+ sd_bus *bus,
+ const char *path,
+ const char *interface,
+ char **names) {
+
+ BUS_DONT_DESTROY(bus);
+ bool found_interface = false;
+ char *prefix;
+ int r;
+
+ assert_return(bus, -EINVAL);
+ assert_return(object_path_is_valid(path), -EINVAL);
+ assert_return(interface_name_is_valid(interface), -EINVAL);
+ assert_return(BUS_IS_OPEN(bus->state), -ENOTCONN);
+ assert_return(!bus_pid_changed(bus), -ECHILD);
+
+
+ /* A non-NULL but empty names list means nothing needs to be
+ generated. A NULL list OTOH indicates that all properties
+ that are set to EMITS_CHANGE or EMITS_INVALIDATION shall be
+ included in the PropertiesChanged message. */
+ if (names && names[0] == NULL)
+ return 0;
+
+ do {
+ bus->nodes_modified = false;
+
+ r = emit_properties_changed_on_interface(bus, path, path, interface, false, &found_interface, names);
+ if (r != 0)
+ return r;
+ if (bus->nodes_modified)
+ continue;
+
+ prefix = alloca(strlen(path) + 1);
+ OBJECT_PATH_FOREACH_PREFIX(prefix, path) {
+ r = emit_properties_changed_on_interface(bus, prefix, path, interface, true, &found_interface, names);
+ if (r != 0)
+ return r;
+ if (bus->nodes_modified)
+ break;
+ }
+
+ } while (bus->nodes_modified);
+
+ return found_interface ? 0 : -ENOENT;
+}
+
+_public_ int sd_bus_emit_properties_changed(
+ sd_bus *bus,
+ const char *path,
+ const char *interface,
+ const char *name, ...) {
+
+ char **names;
+
+ assert_return(bus, -EINVAL);
+ assert_return(object_path_is_valid(path), -EINVAL);
+ assert_return(interface_name_is_valid(interface), -EINVAL);
+ assert_return(BUS_IS_OPEN(bus->state), -ENOTCONN);
+ assert_return(!bus_pid_changed(bus), -ECHILD);
+
+ if (!name)
+ return 0;
+
+ names = strv_from_stdarg_alloca(name);
+
+ return sd_bus_emit_properties_changed_strv(bus, path, interface, names);
+}
+
+static int interfaces_added_append_one_prefix(
+ sd_bus *bus,
+ sd_bus_message *m,
+ const char *prefix,
+ const char *path,
+ const char *interface,
+ bool require_fallback) {
+
+ _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
+ bool found_interface = false;
+ struct node_vtable *c;
+ struct node *n;
+ void *u = NULL;
+ int r;
+
+ assert(bus);
+ assert(m);
+ assert(prefix);
+ assert(path);
+ assert(interface);
+
+ n = hashmap_get(bus->nodes, prefix);
+ if (!n)
+ return 0;
+
+ LIST_FOREACH(vtables, c, n->vtables) {
+ if (require_fallback && !c->is_fallback)
+ continue;
+
+ if (!streq(c->interface, interface))
+ continue;
+
+ r = node_vtable_get_userdata(bus, path, c, &u, &error);
+ if (r < 0)
+ return r;
+ if (bus->nodes_modified)
+ return 0;
+ if (r == 0)
+ continue;
+
+ if (!found_interface) {
+ r = sd_bus_message_append_basic(m, 's', interface);
+ if (r < 0)
+ return r;
+
+ r = sd_bus_message_open_container(m, 'a', "{sv}");
+ if (r < 0)
+ return r;
+
+ found_interface = true;
+ }
+
+ r = vtable_append_all_properties(bus, m, path, c, u, &error);
+ if (r < 0)
+ return r;
+ if (bus->nodes_modified)
+ return 0;
+ }
+
+ if (found_interface) {
+ r = sd_bus_message_close_container(m);
+ if (r < 0)
+ return r;
+ }
+
+ return found_interface;
+}
+
+static int interfaces_added_append_one(
+ sd_bus *bus,
+ sd_bus_message *m,
+ const char *path,
+ const char *interface) {
+
+ char *prefix;
+ int r;
+
+ assert(bus);
+ assert(m);
+ assert(path);
+ assert(interface);
+
+ r = interfaces_added_append_one_prefix(bus, m, path, path, interface, false);
+ if (r != 0)
+ return r;
+ if (bus->nodes_modified)
+ return 0;
+
+ prefix = alloca(strlen(path) + 1);
+ OBJECT_PATH_FOREACH_PREFIX(prefix, path) {
+ r = interfaces_added_append_one_prefix(bus, m, prefix, path, interface, true);
+ if (r != 0)
+ return r;
+ if (bus->nodes_modified)
+ return 0;
+ }
+
+ return -ENOENT;
+}
+
+_public_ int sd_bus_emit_interfaces_added_strv(sd_bus *bus, const char *path, char **interfaces) {
+ BUS_DONT_DESTROY(bus);
+
+ _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
+ char **i;
+ int r;
+
+ 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);
+
+ if (strv_isempty(interfaces))
+ return 0;
+
+ do {
+ bus->nodes_modified = false;
+
+ if (m)
+ m = sd_bus_message_unref(m);
+
+ r = sd_bus_message_new_signal(bus, path, "org.freedesktop.DBus.ObjectManager", "InterfacesAdded", &m);
+ if (r < 0)
+ return r;
+
+ r = sd_bus_message_append_basic(m, 'o', path);
+ if (r < 0)
+ return r;
+
+ r = sd_bus_message_open_container(m, 'a', "{sa{sv}}");
+ if (r < 0)
+ return r;
+
+ STRV_FOREACH(i, interfaces) {
+ assert_return(interface_name_is_valid(*i), -EINVAL);
+
+ r = sd_bus_message_open_container(m, 'e', "sa{sv}");
+ if (r < 0)
+ return r;
+
+ r = interfaces_added_append_one(bus, m, path, *i);
+ if (r < 0)
+ return r;
+
+ if (bus->nodes_modified)
+ break;
+
+ r = sd_bus_message_close_container(m);
+ if (r < 0)
+ return r;
+ }
+
+ if (bus->nodes_modified)
+ continue;
+
+ r = sd_bus_message_close_container(m);
+ if (r < 0)
+ return r;
+
+ } while (bus->nodes_modified);
+
+ return sd_bus_send(bus, m, NULL);
+}
+
+_public_ int sd_bus_emit_interfaces_added(sd_bus *bus, const char *path, const char *interface, ...) {
+ 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);
+
+ interfaces = strv_from_stdarg_alloca(interface);
+
+ return sd_bus_emit_interfaces_added_strv(bus, path, interfaces);
+}
+
+_public_ int sd_bus_emit_interfaces_removed_strv(sd_bus *bus, const char *path, char **interfaces) {
+ _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
+ int r;
+
+ 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);
+
+ if (strv_isempty(interfaces))
+ return 0;
+
+ r = sd_bus_message_new_signal(bus, path, "org.freedesktop.DBus.ObjectManager", "InterfacesRemoved", &m);
+ if (r < 0)
+ return r;
+
+ r = sd_bus_message_append_basic(m, 'o', path);
+ if (r < 0)
+ return r;
+
+ r = sd_bus_message_append_strv(m, interfaces);
+ if (r < 0)
+ return r;
+
+ return sd_bus_send(bus, m, NULL);
+}
+
+_public_ int sd_bus_emit_interfaces_removed(sd_bus *bus, const char *path, const char *interface, ...) {
+ 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);
+
+ interfaces = strv_from_stdarg_alloca(interface);
+
+ return sd_bus_emit_interfaces_removed_strv(bus, path, interfaces);
+}
+
+_public_ int sd_bus_add_object_manager(sd_bus *bus, const char *path) {
+ struct node *n;
+
+ assert_return(bus, -EINVAL);
+ assert_return(object_path_is_valid(path), -EINVAL);
+ assert_return(!bus_pid_changed(bus), -ECHILD);
+
+ n = bus_node_allocate(bus, path);
+ if (!n)
+ return -ENOMEM;
+
+ n->object_manager = true;
+ bus->nodes_modified = true;
+ return 0;
+}
+
+_public_ int sd_bus_remove_object_manager(sd_bus *bus, const char *path) {
+ struct node *n;
+
+ assert_return(bus, -EINVAL);
+ assert_return(object_path_is_valid(path), -EINVAL);
+ assert_return(!bus_pid_changed(bus), -ECHILD);
+
+ n = hashmap_get(bus->nodes, path);
+ if (!n)
+ return 0;
+
+ if (!n->object_manager)
+ return 0;
+
+ n->object_manager = false;
+ bus->nodes_modified = true;
+ bus_node_gc(bus, n);
+
+ return 1;
+}
~ianmdlvl / elogind.git / blobdiff