#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-util.h"

#include "bus-slot.h"

#include "bus-objects.h"

static int node_vtable_get_userdata(

sd_bus *bus,

const char *path,

struct node_vtable *c,

void **userdata,

sd_bus_error *error) {

sd_bus_slot *s;

void *u;

int r;

assert(bus);

assert(path);

assert(c);

s = container_of(c, sd_bus_slot, node_vtable);

u = s->userdata;

if (c->find) {

bus->current_slot = sd_bus_slot_ref(s);

bus->current_userdata = u;

r = c->find(bus, path, c->interface, u, &u, error);

bus->current_userdata = NULL;

bus->current_slot = sd_bus_slot_unref(s);

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;

sd_bus_slot *slot;

if (bus->nodes_modified)

return 0;

slot = container_of(c, sd_bus_slot, node_enumerator);

bus->current_slot = sd_bus_slot_ref(slot);

bus->current_userdata = slot->userdata;

r = c->callback(bus, prefix, slot->userdata, &children, error);

bus->current_userdata = NULL;

bus->current_slot = sd_bus_slot_unref(slot);

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_ops);

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;

sd_bus_slot *slot;

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;

slot = container_of(c, sd_bus_slot, node_callback);

bus->current_slot = sd_bus_slot_ref(slot);

bus->current_handler = c->callback;

bus->current_userdata = slot->userdata;

r = c->callback(bus, m, slot->userdata, &error_buffer);

bus->current_userdata = NULL;

bus->current_handler = NULL;

bus->current_slot = sd_bus_slot_unref(slot);

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) {

uint64_t cap;

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;

/* Check have the caller has the requested 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_query_sender_privilege(m, cap);

if (r < 0)

return r;

if (r > 0)

return 0;

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

m->enforced_reply_signature = strempty(c->vtable->x.method.result);

if (c->vtable->x.method.handler) {

sd_bus_slot *slot;

slot = container_of(c->parent, sd_bus_slot, node_vtable);

bus->current_slot = sd_bus_slot_ref(slot);

bus->current_handler = c->vtable->x.method.handler;

bus->current_userdata = u;

r = c->vtable->x.method.handler(bus, m, u, &error);

bus->current_userdata = NULL;

bus->current_handler = NULL;

bus->current_slot = sd_bus_slot_unref(slot);

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,

sd_bus_slot *slot,

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(slot);

assert(v);

assert(path);

assert(interface);

assert(property);

assert(reply);

if (v->x.property.get) {

bus->current_slot = sd_bus_slot_ref(slot);

bus->current_userdata = userdata;

r = v->x.property.get(bus, path, interface, property, reply, userdata, error);

bus->current_userdata = NULL;

bus->current_slot = sd_bus_slot_unref(slot);

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,

sd_bus_slot *slot,

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(slot);

assert(v);

assert(path);

assert(interface);

assert(property);

assert(value);

if (v->x.property.set) {

bus->current_slot = sd_bus_slot_ref(slot);

bus->current_userdata = userdata;

r = v->x.property.set(bus, path, interface, property, value, userdata, error);

bus->current_userdata = NULL;

bus->current_slot = sd_bus_slot_unref(slot);

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;

sd_bus_slot *slot;

void *u = NULL;

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;

slot = container_of(c->parent, sd_bus_slot, node_vtable);

*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

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

r = invoke_property_get(bus, slot, 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 (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, slot, 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) {

sd_bus_slot *slot;

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;

slot = container_of(c, sd_bus_slot, node_vtable);

r = invoke_property_get(bus, slot, 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 int bus_node_exists(

sd_bus *bus,

struct node *n,

const char *path,

bool require_fallback) {

struct node_vtable *c;

struct node_callback *k;

int r;

assert(bus);

assert(n);

assert(path);

/* Tests if there's anything attached directly to this node

if (!require_fallback && (n->enumerators || n->object_managers))

return true;

LIST_FOREACH(callbacks, k, n->callbacks) {

if (require_fallback && !k->is_fallback)

continue;

return 1;

}

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;

r = node_vtable_get_userdata(bus, path, c, NULL, &error);

if (r != 0)

return r;

if (bus->nodes_modified)

return 0;

}

return 0;

}

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, !require_fallback && n->object_managers);

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

r = bus_node_exists(bus, n, m->path, require_fallback);

if (r <= 0)

goto finish;

if (bus->nodes_modified) {

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;

Iterator i;

char *path;

int r;

assert(bus);

assert(m);

assert(n);

assert(found_object);

/* Spec says, GetManagedObjects() is only implemented on the root of a

if (require_fallback || !n->object_managers)

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;

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 (bus->nodes_modified)

return 0;

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 (bus->hello_flags & KDBUS_HELLO_MONITOR)

return 0;

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_ops);

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;

}

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_managers)

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,

sd_bus_slot **slot,

bool fallback,

const char *path,

sd_bus_message_handler_t callback,

void *userdata) {

sd_bus_slot *s;

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;

s = bus_slot_allocate(bus, !slot, BUS_NODE_CALLBACK, sizeof(struct node_callback), userdata);

if (!s) {

r = -ENOMEM;

goto fail;

}

s->node_callback.callback = callback;

s->node_callback.is_fallback = fallback;

s->node_callback.node = n;

LIST_PREPEND(callbacks, n->callbacks, &s->node_callback);

bus->nodes_modified = true;

if (slot)

*slot = s;

return 0;

fail:

sd_bus_slot_unref(s);

bus_node_gc(bus, n);

return r;

}

_public_ int sd_bus_add_object(

sd_bus *bus,

sd_bus_slot **slot,

const char *path,

sd_bus_message_handler_t callback,

void *userdata) {

return bus_add_object(bus, slot, false, path, callback, userdata);

}

_public_ int sd_bus_add_fallback(

sd_bus *bus,

sd_bus_slot **slot,

const char *prefix,

sd_bus_message_handler_t callback,

void *userdata) {

return bus_add_object(bus, slot, true, prefix, callback, userdata);

}

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 const struct hash_ops vtable_member_hash_ops = {

.hash = vtable_member_hash_func,

.compare = vtable_member_compare_func

};

static int add_object_vtable_internal(

sd_bus *bus,

sd_bus_slot **slot,

const char *path,

const char *interface,

const sd_bus_vtable *vtable,

bool fallback,

sd_bus_object_find_t find,

void *userdata) {

sd_bus_slot *s = NULL;

struct node_vtable *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_ops);

if (r < 0)

return r;

r = hashmap_ensure_allocated(&bus->vtable_properties, &vtable_member_hash_ops);

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;

}

}

s = bus_slot_allocate(bus, !slot, BUS_NODE_VTABLE, sizeof(struct node_vtable), userdata);

if (!s) {

r = -ENOMEM;

goto fail;

}

s->node_vtable.is_fallback = fallback;

s->node_vtable.vtable = vtable;

s->node_vtable.find = find;

s->node_vtable.interface = strdup(interface);

if (!s->node_vtable.interface) {

r = -ENOMEM;

goto fail;

}

for (v = s->node_vtable.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 = &s->node_vtable;

m->path = n->path;

m->interface = s->node_vtable.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 = &s->node_vtable;

m->path = n->path;

m->interface = s->node_vtable.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;

}

}

s->node_vtable.node = n;

LIST_INSERT_AFTER(vtables, n->vtables, existing, &s->node_vtable);

bus->nodes_modified = true;

if (slot)

*slot = s;

return 0;

fail:

sd_bus_slot_unref(s);

bus_node_gc(bus, n);

return r;

}

_public_ int sd_bus_add_object_vtable(

sd_bus *bus,

sd_bus_slot **slot,

const char *path,

const char *interface,

const sd_bus_vtable *vtable,

void *userdata) {

return add_object_vtable_internal(bus, slot, path, interface, vtable, false, NULL, userdata);

}

_public_ int sd_bus_add_fallback_vtable(

sd_bus *bus,

sd_bus_slot **slot,

const char *prefix,

const char *interface,

const sd_bus_vtable *vtable,

sd_bus_object_find_t find,

void *userdata) {

return add_object_vtable_internal(bus, slot, prefix, interface, vtable, true, find, userdata);

}

_public_ int sd_bus_add_node_enumerator(

sd_bus *bus,

sd_bus_slot **slot,

const char *path,

sd_bus_node_enumerator_t callback,

void *userdata) {

sd_bus_slot *s;

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;

s = bus_slot_allocate(bus, !slot, BUS_NODE_ENUMERATOR, sizeof(struct node_enumerator), userdata);

if (!s) {

r = -ENOMEM;

goto fail;

}

s->node_enumerator.callback = callback;

s->node_enumerator.node = n;

LIST_PREPEND(enumerators, n->enumerators, &s->node_enumerator);

bus->nodes_modified = true;

if (slot)

*slot = s;

return 0;

fail:

sd_bus_slot_unref(s);

bus_node_gc(bus, n);

return r;

}

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, &m, path, "org.freedesktop.DBus.Properties", "PropertiesChanged");

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

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

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

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_pid_changed(bus), -ECHILD);

if (!BUS_IS_OPEN(bus->state))

return -ENOTCONN;

/* A non-NULL but empty names list means nothing needs to be

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_pid_changed(bus), -ECHILD);

if (!BUS_IS_OPEN(bus->state))

return -ENOTCONN;

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_pid_changed(bus), -ECHILD);

if (!BUS_IS_OPEN(bus->state))

return -ENOTCONN;

if (strv_isempty(interfaces))

return 0;

do {

bus->nodes_modified = false;

m = sd_bus_message_unref(m);

r = sd_bus_message_new_signal(bus, &m, path, "org.freedesktop.DBus.ObjectManager", "InterfacesAdded");

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_pid_changed(bus), -ECHILD);

if (!BUS_IS_OPEN(bus->state))

return -ENOTCONN;

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_pid_changed(bus), -ECHILD);

if (!BUS_IS_OPEN(bus->state))

return -ENOTCONN;

if (strv_isempty(interfaces))

return 0;

r = sd_bus_message_new_signal(bus, &m, path, "org.freedesktop.DBus.ObjectManager", "InterfacesRemoved");

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_pid_changed(bus), -ECHILD);

if (!BUS_IS_OPEN(bus->state))

return -ENOTCONN;

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, sd_bus_slot **slot, const char *path) {

sd_bus_slot *s;

struct node *n;

int r;

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;

s = bus_slot_allocate(bus, !slot, BUS_NODE_OBJECT_MANAGER, sizeof(struct node_object_manager), NULL);

if (!s) {

r = -ENOMEM;

goto fail;

}

s->node_object_manager.node = n;

LIST_PREPEND(object_managers, n->object_managers, &s->node_object_manager);

bus->nodes_modified = true;

if (slot)

*slot = s;

return 0;

fail:

sd_bus_slot_unref(s);

bus_node_gc(bus, n);

return r;

}