| /*-*- 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-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); |
| r = c->find(bus, path, c->interface, u, &u, error); |
| 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); |
| r = c->callback(bus, prefix, slot->userdata, &children, error); |
| 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_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; |
| 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); |
| r = c->callback(bus, m, slot->userdata, &error_buffer); |
| 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) { |
| _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) { |
| sd_bus_slot *slot; |
| |
| slot = container_of(c->parent, sd_bus_slot, node_vtable); |
| |
| bus->current_slot = sd_bus_slot_ref(slot); |
| r = c->vtable->x.method.handler(bus, m, u, &error); |
| 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); |
| r = v->x.property.get(bus, path, interface, property, reply, userdata, error); |
| 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); |
| r = v->x.property.set(bus, path, interface, property, value, userdata, error); |
| 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 |
| * 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, 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 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, 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 bool bus_node_with_object_manager(sd_bus *bus, struct node *n) { |
| assert(bus); |
| assert(n); |
| |
| if (n->object_managers) |
| 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_managers); |
| } |
| |
| 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 (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_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; |
| } |
| |
| 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 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_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; |
| } |
| } |
| |
| 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 |
| * 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_pid_changed(bus), -ECHILD); |
| |
| if (!BUS_IS_OPEN(bus->state)) |
| return -ENOTCONN; |
| |
| /* 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_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; |
| } |