libsystemd/sd-bus/bus-control.c

	bus-control.c revision f8c2425287c8362ae3a3c9acfb9e23a16862b38a
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering/***
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering  This file is part of systemd.
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering  Copyright 2013 Lennart Poettering
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering  systemd is free software; you can redistribute it and/or modify it
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering  under the terms of the GNU Lesser General Public License as published by
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering  the Free Software Foundation; either version 2.1 of the License, or
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering  (at your option) any later version.
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering  systemd is distributed in the hope that it will be useful, but
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering  WITHOUT ANY WARRANTY; without even the implied warranty of
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering  Lesser General Public License for more details.
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering  You should have received a copy of the GNU Lesser General Public License
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering  along with systemd; If not, see <http://www.gnu.org/licenses/>.
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering***/
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering#ifdef HAVE_VALGRIND_MEMCHECK_H
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering#include <valgrind/memcheck.h>
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering#endif
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering#include <stddef.h>
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering#include <errno.h>
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering#include "strv.h"
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering#include "sd-bus.h"
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering#include "bus-internal.h"
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering#include "bus-message.h"
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering#include "bus-control.h"
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering#include "bus-bloom.h"
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering#include "bus-util.h"
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering#include "cgroup-util.h"
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering_public_ int sd_bus_get_unique_name(sd_bus *bus, const char **unique) {
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        int r;
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        assert_return(bus, -EINVAL);
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        assert_return(unique, -EINVAL);
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        assert_return(!bus_pid_changed(bus), -ECHILD);
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        r = bus_ensure_running(bus);
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        if (r < 0)
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering                return r;
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        *unique = bus->unique_name;
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        return 0;
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering}
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poetteringstatic int bus_request_name_kernel(sd_bus *bus, const char *name, uint64_t flags) {
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        struct kdbus_cmd_name *n;
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        size_t size, l;
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        int r;
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        assert(bus);
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        assert(name);
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        l = strlen(name);
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        size = offsetof(struct kdbus_cmd_name, items) + KDBUS_ITEM_SIZE(l + 1);
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        n = alloca0_align(size, 8);
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        n->size = size;
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        kdbus_translate_request_name_flags(flags, (uint64_t *) &n->flags);
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        n->items[0].size = KDBUS_ITEM_HEADER_SIZE + l + 1;
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        n->items[0].type = KDBUS_ITEM_NAME;
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        memcpy(n->items[0].str, name, l+1);
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering#ifdef HAVE_VALGRIND_MEMCHECK_H
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        VALGRIND_MAKE_MEM_DEFINED(n, n->size);
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering#endif
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        r = ioctl(bus->input_fd, KDBUS_CMD_NAME_ACQUIRE, n);
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        if (r < 0)
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering                return -errno;
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        if (n->flags & KDBUS_NAME_IN_QUEUE)
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering                return 0;
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        return 1;
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering}
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poetteringstatic int bus_request_name_dbus1(sd_bus *bus, const char *name, uint64_t flags) {
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        uint32_t ret, param = 0;
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        int r;
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        assert(bus);
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        assert(name);
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        if (flags & SD_BUS_NAME_ALLOW_REPLACEMENT)
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering                param |= BUS_NAME_ALLOW_REPLACEMENT;
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        if (flags & SD_BUS_NAME_REPLACE_EXISTING)
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering                param |= BUS_NAME_REPLACE_EXISTING;
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        if (!(flags & SD_BUS_NAME_QUEUE))
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering                param |= BUS_NAME_DO_NOT_QUEUE;
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        r = sd_bus_call_method(
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering                        bus,
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering                        "org.freedesktop.DBus",
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering                        "/org/freedesktop/DBus",
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering                        "org.freedesktop.DBus",
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering                        "RequestName",
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering                        NULL,
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering                        &reply,
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering                        "su",
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering                        name,
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering                        param);
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        if (r < 0)
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering                return r;
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        r = sd_bus_message_read(reply, "u", &ret);
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        if (r < 0)
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering                return r;
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        if (ret == BUS_NAME_ALREADY_OWNER)
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering                return -EALREADY;
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        else if (ret == BUS_NAME_EXISTS)
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering                return -EEXIST;
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        else if (ret == BUS_NAME_IN_QUEUE)
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering                return 0;
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        else if (ret == BUS_NAME_PRIMARY_OWNER)
c90feab4ff8bc23d88d4f9c67d9652ba189cb51bMichal Schmidt                return 1;
c90feab4ff8bc23d88d4f9c67d9652ba189cb51bMichal Schmidt
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        return -EIO;
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering}
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering_public_ int sd_bus_request_name(sd_bus *bus, const char *name, uint64_t flags) {
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        assert_return(bus, -EINVAL);
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        assert_return(name, -EINVAL);
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        assert_return(bus->bus_client, -EINVAL);
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        assert_return(!bus_pid_changed(bus), -ECHILD);
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        assert_return(!(flags & ~(SD_BUS_NAME_ALLOW_REPLACEMENT|SD_BUS_NAME_REPLACE_EXISTING|SD_BUS_NAME_QUEUE)), -EINVAL);
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        assert_return(service_name_is_valid(name), -EINVAL);
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        assert_return(name[0] != ':', -EINVAL);
c90feab4ff8bc23d88d4f9c67d9652ba189cb51bMichal Schmidt
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        if (!BUS_IS_OPEN(bus->state))
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering                return -ENOTCONN;
c90feab4ff8bc23d88d4f9c67d9652ba189cb51bMichal Schmidt
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        if (bus->is_kernel)
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering                return bus_request_name_kernel(bus, name, flags);
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        else
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering                return bus_request_name_dbus1(bus, name, flags);
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering}
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poetteringstatic int bus_release_name_kernel(sd_bus *bus, const char *name) {
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        struct kdbus_cmd_name *n;
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        size_t size, l;
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        int r;
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        assert(bus);
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        assert(name);
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        l = strlen(name);
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        size = offsetof(struct kdbus_cmd_name, items) + KDBUS_ITEM_SIZE(l + 1);
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        n = alloca0_align(size, 8);
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        n->size = size;
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        n->items[0].size = KDBUS_ITEM_HEADER_SIZE + l + 1;
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        n->items[0].type = KDBUS_ITEM_NAME;
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        memcpy(n->items[0].str, name, l+1);
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering#ifdef HAVE_VALGRIND_MEMCHECK_H
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        VALGRIND_MAKE_MEM_DEFINED(n, n->size);
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering#endif
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        r = ioctl(bus->input_fd, KDBUS_CMD_NAME_RELEASE, n);
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        if (r < 0)
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering                return -errno;
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        return n->flags;
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering}
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poetteringstatic int bus_release_name_dbus1(sd_bus *bus, const char *name) {
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        uint32_t ret;
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        int r;
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        assert(bus);
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        assert(name);
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        r = sd_bus_call_method(
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering                        bus,
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering                        "org.freedesktop.DBus",
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering                        "/org/freedesktop/DBus",
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering                        "org.freedesktop.DBus",
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering                        "ReleaseName",
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering                        NULL,
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering                        &reply,
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering                        "s",
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering                        name);
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        if (r < 0)
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering                return r;
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        r = sd_bus_message_read(reply, "u", &ret);
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        if (r < 0)
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering                return r;
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        if (ret == BUS_NAME_NON_EXISTENT)
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering                return -ESRCH;
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        if (ret == BUS_NAME_NOT_OWNER)
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering                return -EADDRINUSE;
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        if (ret == BUS_NAME_RELEASED)
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering                return 0;
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        return -EINVAL;
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering}
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering_public_ int sd_bus_release_name(sd_bus *bus, const char *name) {
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        assert_return(bus, -EINVAL);
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        assert_return(name, -EINVAL);
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        assert_return(bus->bus_client, -EINVAL);
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        assert_return(!bus_pid_changed(bus), -ECHILD);
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        assert_return(service_name_is_valid(name), -EINVAL);
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        assert_return(name[0] != ':', -EINVAL);
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        if (!BUS_IS_OPEN(bus->state))
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering                return -ENOTCONN;
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        if (bus->is_kernel)
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering                return bus_release_name_kernel(bus, name);
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        else
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering                return bus_release_name_dbus1(bus, name);
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering}
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poetteringstatic int kernel_get_list(sd_bus *bus, uint64_t flags, char ***x) {
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        struct kdbus_cmd_name_list cmd = {};
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        struct kdbus_name_list *name_list;
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        struct kdbus_cmd_name *name;
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        uint64_t previous_id = 0;
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        int r;
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        /* Caller will free half-constructed list on failure... */
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        cmd.flags = flags;
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        r = ioctl(bus->input_fd, KDBUS_CMD_NAME_LIST, &cmd);
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        if (r < 0)
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering                return -errno;
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        name_list = (struct kdbus_name_list *) ((uint8_t *) bus->kdbus_buffer + cmd.offset);
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering        KDBUS_ITEM_FOREACH(name, name_list, names) {
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering                struct kdbus_item *item;
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering                const char *entry_name = NULL;
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering                if ((flags & KDBUS_NAME_LIST_UNIQUE) && name->owner_id != previous_id) {
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering                        char *n;
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering                        if (asprintf(&n, ":1.%llu", (unsigned long long) name->owner_id) < 0)
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering                                return -ENOMEM;
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering                        r = strv_consume(x, n);
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering                        if (r < 0)
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering                                return r;
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering
71dc3ed1d95dfe246004018c2ca85156fc73c146Lennart Poettering                        previous_id = name->owner_id;
                }

                KDBUS_ITEM_FOREACH(item, name, items)
                        if (item->type == KDBUS_ITEM_NAME)
                                entry_name = item->str;

                if (entry_name && service_name_is_valid(entry_name)) {
                        r = strv_extend(x, entry_name);
                        if (r < 0)
                                return -ENOMEM;
                }
        }

        r = ioctl(bus->input_fd, KDBUS_CMD_FREE, &cmd.offset);
        if (r < 0)
                return -errno;

        return 0;
}

static int bus_list_names_kernel(sd_bus *bus, char ***acquired, char ***activatable) {
        _cleanup_strv_free_ char **x = NULL, **y = NULL;
        int r;

        if (acquired) {
                r = kernel_get_list(bus, KDBUS_NAME_LIST_UNIQUE | KDBUS_NAME_LIST_NAMES, &x);
                if (r < 0)
                        return r;
        }

        if (activatable) {
                r = kernel_get_list(bus, KDBUS_NAME_LIST_ACTIVATORS, &y);
                if (r < 0)
                        return r;

                *activatable = y;
                y = NULL;
        }

        if (acquired) {
                *acquired = x;
                x = NULL;
        }

        return 0;
}

static int bus_list_names_dbus1(sd_bus *bus, char ***acquired, char ***activatable) {
        _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
        _cleanup_strv_free_ char **x = NULL, **y = NULL;
        int r;

        if (acquired) {
                r = sd_bus_call_method(
                                bus,
                                "org.freedesktop.DBus",
                                "/org/freedesktop/DBus",
                                "org.freedesktop.DBus",
                                "ListNames",
                                NULL,
                                &reply,
                                NULL);
                if (r < 0)
                        return r;

                r = sd_bus_message_read_strv(reply, &x);
                if (r < 0)
                        return r;

                reply = sd_bus_message_unref(reply);
        }

        if (activatable) {
                r = sd_bus_call_method(
                                bus,
                                "org.freedesktop.DBus",
                                "/org/freedesktop/DBus",
                                "org.freedesktop.DBus",
                                "ListActivatableNames",
                                NULL,
                                &reply,
                                NULL);
                if (r < 0)
                        return r;

                r = sd_bus_message_read_strv(reply, &y);
                if (r < 0)
                        return r;

                *activatable = y;
                y = NULL;
        }

        if (acquired) {
                *acquired = x;
                x = NULL;
        }

        return 0;
}

_public_ int sd_bus_list_names(sd_bus *bus, char ***acquired, char ***activatable) {
        assert_return(bus, -EINVAL);
        assert_return(acquired || activatable, -EINVAL);
        assert_return(!bus_pid_changed(bus), -ECHILD);

        if (!BUS_IS_OPEN(bus->state))
                return -ENOTCONN;

        if (bus->is_kernel)
                return bus_list_names_kernel(bus, acquired, activatable);
        else
                return bus_list_names_dbus1(bus, acquired, activatable);
}

static int bus_get_owner_kdbus(
                sd_bus *bus,
                const char *name,
                uint64_t mask,
                sd_bus_creds **creds) {

        _cleanup_bus_creds_unref_ sd_bus_creds *c = NULL;
        struct kdbus_cmd_conn_info *cmd;
        struct kdbus_conn_info *conn_info;
        struct kdbus_item *item;
        size_t size;
        uint64_t m, id;
        int r;

        r = bus_kernel_parse_unique_name(name, &id);
        if (r < 0)
                return r;
        if (r > 0) {
                size = offsetof(struct kdbus_cmd_conn_info, name);
                cmd = alloca0_align(size, 8);
                cmd->id = id;
        } else {
                size = offsetof(struct kdbus_cmd_conn_info, name) + strlen(name) + 1;
                cmd = alloca0_align(size, 8);
                strcpy(cmd->name, name);
        }

        cmd->size = size;
        kdbus_translate_attach_flags(mask, (uint64_t*) &cmd->flags);

        r = ioctl(bus->input_fd, KDBUS_CMD_CONN_INFO, cmd);
        if (r < 0)
                return -errno;

        conn_info = (struct kdbus_conn_info *) ((uint8_t *) bus->kdbus_buffer + cmd->offset);

        /* Non-activated names are considered not available */
        if (conn_info->flags & KDBUS_HELLO_ACTIVATOR)
                return name[0] == ':' ? -ENXIO : -ESRCH;

        c = bus_creds_new();
        if (!c)
                return -ENOMEM;

        if (mask & SD_BUS_CREDS_UNIQUE_NAME) {
                if (asprintf(&c->unique_name, ":1.%llu", (unsigned long long) conn_info->id) < 0)
                        return -ENOMEM;

                c->mask |= SD_BUS_CREDS_UNIQUE_NAME;
        }

        KDBUS_ITEM_FOREACH(item, conn_info, items) {

                switch (item->type) {

                case KDBUS_ITEM_CREDS:
                        m = (SD_BUS_CREDS_UID | SD_BUS_CREDS_GID | SD_BUS_CREDS_PID) & mask;

                        if (m) {
                                c->uid = (uid_t) item->creds.uid;
                                c->pid = (pid_t) item->creds.pid;
                                c->gid = (gid_t) item->creds.gid;
                                c->mask |= m;
                        }

                        if (mask & SD_BUS_CREDS_TID && item->creds.tid > 0) {
                                c->tid = (pid_t) item->creds.tid;
                                c->mask |= SD_BUS_CREDS_TID;
                        }

                        if (mask & SD_BUS_CREDS_PID_STARTTIME && item->creds.starttime > 0) {
                                c->pid_starttime = item->creds.starttime;
                                c->mask |= SD_BUS_CREDS_PID_STARTTIME;
                        }

                        break;

                case KDBUS_ITEM_PID_COMM:
                        if (mask & SD_BUS_CREDS_COMM) {
                                c->comm = strdup(item->str);
                                if (!c->comm) {
                                        r = -ENOMEM;
                                        goto fail;
                                }

                                c->mask |= SD_BUS_CREDS_COMM;
                        }
                        break;

                case KDBUS_ITEM_TID_COMM:
                        if (mask & SD_BUS_CREDS_TID_COMM) {
                                c->tid_comm = strdup(item->str);
                                if (!c->tid_comm) {
                                        r = -ENOMEM;
                                        goto fail;
                                }

                                c->mask |= SD_BUS_CREDS_TID_COMM;
                        }
                        break;

                case KDBUS_ITEM_EXE:
                        if (mask & SD_BUS_CREDS_EXE) {
                                c->exe = strdup(item->str);
                                if (!c->exe) {
                                        r = -ENOMEM;
                                        goto fail;
                                }

                                c->mask |= SD_BUS_CREDS_EXE;
                        }
                        break;

                case KDBUS_ITEM_CMDLINE:
                        if (mask & SD_BUS_CREDS_CMDLINE) {
                                c->cmdline_size = item->size - KDBUS_ITEM_HEADER_SIZE;
                                c->cmdline = memdup(item->data, c->cmdline_size);
                                if (!c->cmdline) {
                                        r = -ENOMEM;
                                        goto fail;
                                }

                                c->mask |= SD_BUS_CREDS_CMDLINE;
                        }
                        break;

                case KDBUS_ITEM_CGROUP:
                        m = (SD_BUS_CREDS_CGROUP | SD_BUS_CREDS_UNIT |
                             SD_BUS_CREDS_USER_UNIT | SD_BUS_CREDS_SLICE |
                             SD_BUS_CREDS_SESSION | SD_BUS_CREDS_OWNER_UID) & mask;

                        if (m) {
                                c->cgroup = strdup(item->str);
                                if (!c->cgroup) {
                                        r = -ENOMEM;
                                        goto fail;
                                }

                                r = bus_get_root_path(bus);
                                if (r < 0)
                                        goto fail;

                                c->cgroup_root = strdup(bus->cgroup_root);
                                if (!c->cgroup_root) {
                                        r = -ENOMEM;
                                        goto fail;
                                }

                                c->mask |= m;
                        }
                        break;

                case KDBUS_ITEM_CAPS:
                        m = (SD_BUS_CREDS_EFFECTIVE_CAPS | SD_BUS_CREDS_PERMITTED_CAPS |
                             SD_BUS_CREDS_INHERITABLE_CAPS | SD_BUS_CREDS_BOUNDING_CAPS) & mask;

                        if (m) {
                                c->capability_size = item->size - KDBUS_ITEM_HEADER_SIZE;
                                c->capability = memdup(item->data, c->capability_size);
                                if (!c->capability) {
                                        r = -ENOMEM;
                                        goto fail;
                                }

                                c->mask |= m;
                        }
                        break;

                case KDBUS_ITEM_SECLABEL:
                        if (mask & SD_BUS_CREDS_SELINUX_CONTEXT) {
                                c->label = strdup(item->str);
                                if (!c->label) {
                                        r = -ENOMEM;
                                        goto fail;
                                }

                                c->mask |= SD_BUS_CREDS_SELINUX_CONTEXT;
                        }
                        break;

                case KDBUS_ITEM_AUDIT:
                        m = (SD_BUS_CREDS_AUDIT_SESSION_ID | SD_BUS_CREDS_AUDIT_LOGIN_UID) & mask;

                        if (m) {
                                c->audit_session_id = item->audit.sessionid;
                                c->audit_login_uid = item->audit.loginuid;
                                c->mask |= m;
                        }
                        break;

                case KDBUS_ITEM_NAME:
                        if ((mask & SD_BUS_CREDS_WELL_KNOWN_NAMES) && service_name_is_valid(item->name.name)) {
                                r = strv_extend(&c->well_known_names, item->name.name);
                                if (r < 0)
                                        goto fail;

                                c->mask |= SD_BUS_CREDS_WELL_KNOWN_NAMES;
                        }
                        break;

                case KDBUS_ITEM_CONN_NAME:
                        if ((mask & SD_BUS_CREDS_CONNECTION_NAME)) {
                                c->conn_name = strdup(item->str);
                                if (!c->conn_name) {
                                        r = -ENOMEM;
                                        goto fail;
                                }

                                c->mask |= SD_BUS_CREDS_CONNECTION_NAME;
                        }
                        break;
                }
        }

        if (creds) {
                *creds = c;
                c = NULL;
        }

        r = 0;

fail:
        ioctl(bus->input_fd, KDBUS_CMD_FREE, &cmd->offset);
        return r;
}

static int bus_get_owner_dbus1(
                sd_bus *bus,
                const char *name,
                uint64_t mask,
                sd_bus_creds **creds) {

        _cleanup_bus_message_unref_ sd_bus_message *reply_unique = NULL, *reply = NULL;
        _cleanup_bus_creds_unref_ sd_bus_creds *c = NULL;
        const char *unique = NULL;
        pid_t pid = 0;
        int r;

        /* Only query the owner if the caller wants to know it or if
         * the caller just wants to check whether a name exists */
        if ((mask & SD_BUS_CREDS_UNIQUE_NAME) || mask == 0) {
                r = sd_bus_call_method(
                                bus,
                                "org.freedesktop.DBus",
                                "/org/freedesktop/DBus",
                                "org.freedesktop.DBus",
                                "GetNameOwner",
                                NULL,
                                &reply_unique,
                                "s",
                                name);
                if (r < 0)
                        return r;

                r = sd_bus_message_read(reply_unique, "s", &unique);
                if (r < 0)
                        return r;
        }

        if (mask != 0) {
                c = bus_creds_new();
                if (!c)
                        return -ENOMEM;

                if ((mask & SD_BUS_CREDS_UNIQUE_NAME) && unique) {
                        c->unique_name = strdup(unique);
                        if (!c->unique_name)
                                return -ENOMEM;

                        c->mask |= SD_BUS_CREDS_UNIQUE_NAME;
                }

                if (mask & (SD_BUS_CREDS_PID|SD_BUS_CREDS_PID_STARTTIME|SD_BUS_CREDS_GID|
                            SD_BUS_CREDS_COMM|SD_BUS_CREDS_EXE|SD_BUS_CREDS_CMDLINE|
                            SD_BUS_CREDS_CGROUP|SD_BUS_CREDS_UNIT|SD_BUS_CREDS_USER_UNIT|SD_BUS_CREDS_SLICE|SD_BUS_CREDS_SESSION|SD_BUS_CREDS_OWNER_UID|
                            SD_BUS_CREDS_EFFECTIVE_CAPS|SD_BUS_CREDS_PERMITTED_CAPS|SD_BUS_CREDS_INHERITABLE_CAPS|SD_BUS_CREDS_BOUNDING_CAPS|
                            SD_BUS_CREDS_AUDIT_SESSION_ID|SD_BUS_CREDS_AUDIT_LOGIN_UID)) {
                        uint32_t u;

                        r = sd_bus_call_method(
                                        bus,
                                        "org.freedesktop.DBus",
                                        "/org/freedesktop/DBus",
                                        "org.freedesktop.DBus",
                                        "GetConnectionUnixProcessID",
                                        NULL,
                                        &reply,
                                        "s",
                                        unique ? unique : name);
                        if (r < 0)
                                return r;

                        r = sd_bus_message_read(reply, "u", &u);
                        if (r < 0)
                                return r;

                        pid = u;
                        if (mask & SD_BUS_CREDS_PID) {
                                c->pid = u;
                                c->mask |= SD_BUS_CREDS_PID;
                        }

                        reply = sd_bus_message_unref(reply);
                }

                if (mask & SD_BUS_CREDS_UID) {
                        uint32_t u;

                        r = sd_bus_call_method(
                                        bus,
                                        "org.freedesktop.DBus",
                                        "/org/freedesktop/DBus",
                                        "org.freedesktop.DBus",
                                        "GetConnectionUnixUser",
                                        NULL,
                                        &reply,
                                        "s",
                                        unique ? unique : name);
                        if (r < 0)
                                return r;

                        r = sd_bus_message_read(reply, "u", &u);
                        if (r < 0)
                                return r;

                        c->uid = u;
                        c->mask |= SD_BUS_CREDS_UID;

                        reply = sd_bus_message_unref(reply);
                }

                if (mask & SD_BUS_CREDS_SELINUX_CONTEXT) {
                        const void *p = NULL;
                        size_t sz = 0;

                        r = sd_bus_call_method(
                                        bus,
                                        "org.freedesktop.DBus",
                                        "/org/freedesktop/DBus",
                                        "org.freedesktop.DBus",
                                        "GetConnectionSELinuxSecurityContext",
                                        NULL,
                                        &reply,
                                        "s",
                                        unique ? unique : name);
                        if (r < 0)
                                return r;

                        r = sd_bus_message_read_array(reply, 'y', &p, &sz);
                        if (r < 0)
                                return r;

                        c->label = strndup(p, sz);
                        if (!c->label)
                                return -ENOMEM;

                        c->mask |= SD_BUS_CREDS_SELINUX_CONTEXT;
                }

                r = bus_creds_add_more(c, mask, pid, 0);
                if (r < 0)
                        return r;
        }

        if (creds) {
                *creds = c;
                c = NULL;
        }

        return 0;
}

_public_ int sd_bus_get_owner(
                sd_bus *bus,
                const char *name,
                uint64_t mask,
                sd_bus_creds **creds) {

        assert_return(bus, -EINVAL);
        assert_return(name, -EINVAL);
        assert_return(mask <= _SD_BUS_CREDS_ALL, -ENOTSUP);
        assert_return(mask == 0 || creds, -EINVAL);
        assert_return(!bus_pid_changed(bus), -ECHILD);
        assert_return(service_name_is_valid(name), -EINVAL);
        assert_return(bus->bus_client, -ENODATA);

        if (!BUS_IS_OPEN(bus->state))
                return -ENOTCONN;

        if (bus->is_kernel)
                return bus_get_owner_kdbus(bus, name, mask, creds);
        else
                return bus_get_owner_dbus1(bus, name, mask, creds);
}

static int add_name_change_match(sd_bus *bus,
                                 uint64_t cookie,
                                 const char *name,
                                 const char *old_owner,
                                 const char *new_owner) {

        uint64_t name_id = KDBUS_MATCH_ID_ANY, old_owner_id = 0, new_owner_id = 0;
        int is_name_id = -1, r;
        struct kdbus_item *item;

        assert(bus);

        /* If we encounter a match that could match against
         * NameOwnerChanged messages, then we need to create
         * KDBUS_ITEM_NAME_{ADD,REMOVE,CHANGE} and
         * KDBUS_ITEM_ID_{ADD,REMOVE} matches for it, possibly
         * multiple if the match is underspecified.
         *
         * The NameOwnerChanged signals take three parameters with
         * unique or well-known names, but only some forms actually
         * exist:
         *
         * WELLKNOWN, "", UNIQUE       → KDBUS_ITEM_NAME_ADD
         * WELLKNOWN, UNIQUE, ""       → KDBUS_ITEM_NAME_REMOVE
         * WELLKNOWN, UNIQUE, UNIQUE   → KDBUS_ITEM_NAME_CHANGE
         * UNIQUE, "", UNIQUE          → KDBUS_ITEM_ID_ADD
         * UNIQUE, UNIQUE, ""          → KDBUS_ITEM_ID_REMOVE
         *
         * For the latter two the two unique names must be identical.
         *
         * */

        if (name) {
                is_name_id = bus_kernel_parse_unique_name(name, &name_id);
                if (is_name_id < 0)
                        return 0;
        }

        if (!isempty(old_owner)) {
                r = bus_kernel_parse_unique_name(old_owner, &old_owner_id);
                if (r < 0)
                        return 0;
                if (r == 0)
                        return 0;
                if (is_name_id > 0 && old_owner_id != name_id)
                        return 0;
        } else
                old_owner_id = KDBUS_MATCH_ID_ANY;

        if (!isempty(new_owner)) {
                r = bus_kernel_parse_unique_name(new_owner, &new_owner_id);
                if (r < 0)
                        return r;
                if (r == 0)
                        return 0;
                if (is_name_id > 0 && new_owner_id != name_id)
                        return 0;
        } else
                new_owner_id = KDBUS_MATCH_ID_ANY;

        if (is_name_id <= 0) {
                struct kdbus_cmd_match *m;
                size_t sz, l;

                /* If the name argument is missing or is a well-known
                 * name, then add KDBUS_ITEM_NAME_{ADD,REMOVE,CHANGE}
                 * matches for it */

                l = name ? strlen(name) + 1 : 0;

                sz = ALIGN8(offsetof(struct kdbus_cmd_match, items) +
                            offsetof(struct kdbus_item, name_change) +
                            offsetof(struct kdbus_notify_name_change, name) +
                            l);

                m = alloca0_align(sz, 8);
                m->size = sz;
                m->cookie = cookie;

                item = m->items;
                item->size =
                        offsetof(struct kdbus_item, name_change) +
                        offsetof(struct kdbus_notify_name_change, name) +
                        l;

                item->name_change.old.id = old_owner_id;
                item->name_change.new.id = new_owner_id;

                if (name)
                        memcpy(item->name_change.name, name, l);

                /* If the old name is unset or empty, then
                 * this can match against added names */
                if (!old_owner || old_owner[0] == 0) {
                        item->type = KDBUS_ITEM_NAME_ADD;

                        r = ioctl(bus->input_fd, KDBUS_CMD_MATCH_ADD, m);
                        if (r < 0)
                                return -errno;
                }

                /* If the new name is unset or empty, then
                 * this can match against removed names */
                if (!new_owner || new_owner[0] == 0) {
                        item->type = KDBUS_ITEM_NAME_REMOVE;

                        r = ioctl(bus->input_fd, KDBUS_CMD_MATCH_ADD, m);
                        if (r < 0)
                                return -errno;
                }

                /* The CHANGE match we need in either case, because
                 * what is reported as a name change by the kernel
                 * might just be an owner change between starter and
                 * normal clients. For userspace such a change should
                 * be considered a removal/addition, hence let's
                 * subscribe to this unconditionally. */
                item->type = KDBUS_ITEM_NAME_CHANGE;
                r = ioctl(bus->input_fd, KDBUS_CMD_MATCH_ADD, m);
                if (r < 0)
                        return -errno;
        }

        if (is_name_id != 0) {
                struct kdbus_cmd_match *m;
                uint64_t sz;

                /* If the name argument is missing or is a unique
                 * name, then add KDBUS_ITEM_ID_{ADD,REMOVE} matches
                 * for it */

                sz = ALIGN8(offsetof(struct kdbus_cmd_match, items) +
                            offsetof(struct kdbus_item, id_change) +
                            sizeof(struct kdbus_notify_id_change));

                m = alloca0_align(sz, 8);
                m->size = sz;
                m->cookie = cookie;

                item = m->items;
                item->size =
                        offsetof(struct kdbus_item, id_change) +
                        sizeof(struct kdbus_notify_id_change);
                item->id_change.id = name_id;

                /* If the old name is unset or empty, then this can
                 * match against added ids */
                if (!old_owner || old_owner[0] == 0) {
                        item->type = KDBUS_ITEM_ID_ADD;

                        r = ioctl(bus->input_fd, KDBUS_CMD_MATCH_ADD, m);
                        if (r < 0)
                                return -errno;
                }

                /* If thew new name is unset or empty, then this can
                 * match against removed ids */
                if (!new_owner || new_owner[0] == 0) {
                        item->type = KDBUS_ITEM_ID_REMOVE;

                        r = ioctl(bus->input_fd, KDBUS_CMD_MATCH_ADD, m);
                        if (r < 0)
                                return -errno;
                }
        }

        return 0;
}

int bus_add_match_internal_kernel(
                sd_bus *bus,
                struct bus_match_component *components,
                unsigned n_components,
                uint64_t cookie) {

        struct kdbus_cmd_match *m;
        struct kdbus_item *item;
        uint64_t *bloom;
        size_t sz;
        const char *sender = NULL;
        size_t sender_length = 0;
        uint64_t src_id = KDBUS_MATCH_ID_ANY;
        bool using_bloom = false;
        unsigned i;
        bool matches_name_change = true;
        const char *name_change_arg[3] = {};
        int r;

        assert(bus);

        bloom = alloca0(bus->bloom_size);

        sz = ALIGN8(offsetof(struct kdbus_cmd_match, items));

        for (i = 0; i < n_components; i++) {
                struct bus_match_component *c = &components[i];

                switch (c->type) {

                case BUS_MATCH_SENDER:
                        if (!streq(c->value_str, "org.freedesktop.DBus"))
                                matches_name_change = false;

                        r = bus_kernel_parse_unique_name(c->value_str, &src_id);
                        if (r < 0)
                                return r;
                        else if (r > 0)
                                sz += ALIGN8(offsetof(struct kdbus_item, id) + sizeof(uint64_t));
                        else  {
                                sender = c->value_str;
                                sender_length = strlen(sender);
                                sz += ALIGN8(offsetof(struct kdbus_item, str) + sender_length + 1);
                        }

                        break;

                case BUS_MATCH_MESSAGE_TYPE:
                        if (c->value_u8 != SD_BUS_MESSAGE_SIGNAL)
                                matches_name_change = false;

                        bloom_add_pair(bloom, bus->bloom_size, bus->bloom_n_hash, "message-type", bus_message_type_to_string(c->value_u8));
                        using_bloom = true;
                        break;

                case BUS_MATCH_INTERFACE:
                        if (!streq(c->value_str, "org.freedesktop.DBus"))
                                matches_name_change = false;

                        bloom_add_pair(bloom, bus->bloom_size, bus->bloom_n_hash, "interface", c->value_str);
                        using_bloom = true;
                        break;

                case BUS_MATCH_MEMBER:
                        if (!streq(c->value_str, "NameOwnerChanged"))
                                matches_name_change = false;

                        bloom_add_pair(bloom, bus->bloom_size, bus->bloom_n_hash, "member", c->value_str);
                        using_bloom = true;
                        break;

                case BUS_MATCH_PATH:
                        if (!streq(c->value_str, "/org/freedesktop/DBus"))
                                matches_name_change = false;

                        bloom_add_pair(bloom, bus->bloom_size, bus->bloom_n_hash, "path", c->value_str);
                        using_bloom = true;
                        break;

                case BUS_MATCH_PATH_NAMESPACE:
                        if (!streq(c->value_str, "/")) {
                                bloom_add_pair(bloom, bus->bloom_size, bus->bloom_n_hash, "path-slash-prefix", c->value_str);
                                using_bloom = true;
                        }
                        break;

                case BUS_MATCH_ARG...BUS_MATCH_ARG_LAST: {
                        char buf[sizeof("arg")-1 + 2 + 1];

                        if (c->type - BUS_MATCH_ARG < 3)
                                name_change_arg[c->type - BUS_MATCH_ARG] = c->value_str;

                        snprintf(buf, sizeof(buf), "arg%u", c->type - BUS_MATCH_ARG);
                        bloom_add_pair(bloom, bus->bloom_size, bus->bloom_n_hash, buf, c->value_str);
                        using_bloom = true;
                        break;
                }

                case BUS_MATCH_ARG_PATH...BUS_MATCH_ARG_PATH_LAST: {
                        char buf[sizeof("arg")-1 + 2 + sizeof("-slash-prefix")];

                        snprintf(buf, sizeof(buf), "arg%u-slash-prefix", c->type - BUS_MATCH_ARG_PATH);
                        bloom_add_pair(bloom, bus->bloom_size, bus->bloom_n_hash, buf, c->value_str);
                        using_bloom = true;
                        break;
                }

                case BUS_MATCH_ARG_NAMESPACE...BUS_MATCH_ARG_NAMESPACE_LAST: {
                        char buf[sizeof("arg")-1 + 2 + sizeof("-dot-prefix")];

                        snprintf(buf, sizeof(buf), "arg%u-dot-prefix", c->type - BUS_MATCH_ARG_NAMESPACE);
                        bloom_add_pair(bloom, bus->bloom_size, bus->bloom_n_hash, buf, c->value_str);
                        using_bloom = true;
                        break;
                }

                case BUS_MATCH_DESTINATION:
                        /* The bloom filter does not include
                           the destination, since it is only
                           available for broadcast messages
                           which do not carry a destination
                           since they are undirected. */
                        break;

                case BUS_MATCH_ROOT:
                case BUS_MATCH_VALUE:
                case BUS_MATCH_LEAF:
                case _BUS_MATCH_NODE_TYPE_MAX:
                case _BUS_MATCH_NODE_TYPE_INVALID:
                        assert_not_reached("Invalid match type?");
                }
        }

        if (using_bloom)
                sz += ALIGN8(offsetof(struct kdbus_item, data64) + bus->bloom_size);

        m = alloca0_align(sz, 8);
        m->size = sz;
        m->cookie = cookie;

        item = m->items;

        if (src_id != KDBUS_MATCH_ID_ANY) {
                item->size = offsetof(struct kdbus_item, id) + sizeof(uint64_t);
                item->type = KDBUS_ITEM_ID;
                item->id = src_id;
                item = KDBUS_ITEM_NEXT(item);
        }

        if (using_bloom) {
                item->size = offsetof(struct kdbus_item, data64) + bus->bloom_size;
                item->type = KDBUS_ITEM_BLOOM_MASK;
                memcpy(item->data64, bloom, bus->bloom_size);
                item = KDBUS_ITEM_NEXT(item);
        }

        if (sender) {
                item->size = offsetof(struct kdbus_item, str) + sender_length + 1;
                item->type = KDBUS_ITEM_NAME;
                memcpy(item->str, sender, sender_length + 1);
        }

        r = ioctl(bus->input_fd, KDBUS_CMD_MATCH_ADD, m);
        if (r < 0)
                return -errno;

        if (matches_name_change) {

                /* If this match could theoretically match
                 * NameOwnerChanged messages, we need to
                 * install a second non-bloom filter explitly
                 * for it */

                r = add_name_change_match(bus, cookie, name_change_arg[0], name_change_arg[1], name_change_arg[2]);
                if (r < 0)
                        return r;
        }

        return 0;
}

#define internal_match(bus, m)                                          \
        ((bus)->hello_flags & KDBUS_HELLO_MONITOR                       \
         ? (isempty(m) ? "eavesdrop='true'" : strappenda((m), ",eavesdrop='true'")) \
         : (m))

static int bus_add_match_internal_dbus1(
                sd_bus *bus,
                const char *match) {

        const char *e;

        assert(bus);
        assert(match);

        e = internal_match(bus, match);

        return sd_bus_call_method(
                        bus,
                        "org.freedesktop.DBus",
                        "/org/freedesktop/DBus",
                        "org.freedesktop.DBus",
                        "AddMatch",
                        NULL,
                        NULL,
                        "s",
                        e);
}

int bus_add_match_internal(
                sd_bus *bus,
                const char *match,
                struct bus_match_component *components,
                unsigned n_components,
                uint64_t cookie) {

        assert(bus);

        if (bus->is_kernel)
                return bus_add_match_internal_kernel(bus, components, n_components, cookie);
        else
                return bus_add_match_internal_dbus1(bus, match);
}

int bus_remove_match_internal_kernel(
                sd_bus *bus,
                uint64_t cookie) {

        struct kdbus_cmd_match m;
        int r;

        assert(bus);

        zero(m);
        m.size = offsetof(struct kdbus_cmd_match, items);
        m.cookie = cookie;

        r = ioctl(bus->input_fd, KDBUS_CMD_MATCH_REMOVE, &m);
        if (r < 0)
                return -errno;

        return 0;
}

static int bus_remove_match_internal_dbus1(
                sd_bus *bus,
                const char *match) {

        const char *e;

        assert(bus);
        assert(match);

        e = internal_match(bus, match);

        return sd_bus_call_method(
                        bus,
                        "org.freedesktop.DBus",
                        "/org/freedesktop/DBus",
                        "org.freedesktop.DBus",
                        "RemoveMatch",
                        NULL,
                        NULL,
                        "s",
                        e);
}

int bus_remove_match_internal(
                sd_bus *bus,
                const char *match,
                uint64_t cookie) {

        assert(bus);

        if (bus->is_kernel)
                return bus_remove_match_internal_kernel(bus, cookie);
        else
                return bus_remove_match_internal_dbus1(bus, match);
}

_public_ int sd_bus_get_owner_machine_id(sd_bus *bus, const char *name, sd_id128_t *machine) {
        _cleanup_bus_message_unref_ sd_bus_message *reply = NULL, *m = NULL;
        const char *mid;
        int r;

        assert_return(bus, -EINVAL);
        assert_return(name, -EINVAL);
        assert_return(machine, -EINVAL);
        assert_return(!bus_pid_changed(bus), -ECHILD);
        assert_return(service_name_is_valid(name), -EINVAL);

        if (!BUS_IS_OPEN(bus->state))
                return -ENOTCONN;

        if (streq_ptr(name, bus->unique_name))
                return sd_id128_get_machine(machine);

        r = sd_bus_message_new_method_call(
                        bus,
                        &m,
                        name,
                        "/",
                        "org.freedesktop.DBus.Peer",
                        "GetMachineId");
        if (r < 0)
                return r;

        r = sd_bus_message_set_auto_start(m, false);
        if (r < 0)
                return r;

        r = sd_bus_call(bus, m, 0, NULL, &reply);
        if (r < 0)
                return r;

        r = sd_bus_message_read(reply, "s", &mid);
        if (r < 0)
                return r;

        return sd_id128_from_string(mid, machine);
}