1218 lines
42 KiB
C
1218 lines
42 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2013 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#ifdef HAVE_VALGRIND_MEMCHECK_H
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#include <valgrind/memcheck.h>
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#endif
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#include <stddef.h>
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#include <errno.h>
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#include "strv.h"
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#include "sd-bus.h"
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#include "bus-internal.h"
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#include "bus-message.h"
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#include "bus-control.h"
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#include "bus-bloom.h"
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#include "bus-util.h"
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#include "cgroup-util.h"
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_public_ int sd_bus_get_unique_name(sd_bus *bus, const char **unique) {
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int r;
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assert_return(bus, -EINVAL);
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assert_return(unique, -EINVAL);
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assert_return(!bus_pid_changed(bus), -ECHILD);
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r = bus_ensure_running(bus);
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if (r < 0)
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return r;
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*unique = bus->unique_name;
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return 0;
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}
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static int bus_request_name_kernel(sd_bus *bus, const char *name, uint64_t flags) {
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struct kdbus_cmd_name *n;
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size_t size, l;
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int r;
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assert(bus);
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assert(name);
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l = strlen(name);
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size = offsetof(struct kdbus_cmd_name, name) + l + 1;
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n = alloca0(size);
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n->size = size;
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kdbus_translate_request_name_flags(flags, (uint64_t *) &n->flags);
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memcpy(n->name, name, l+1);
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#ifdef HAVE_VALGRIND_MEMCHECK_H
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VALGRIND_MAKE_MEM_DEFINED(n, n->size);
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#endif
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r = ioctl(bus->input_fd, KDBUS_CMD_NAME_ACQUIRE, n);
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if (r < 0)
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return -errno;
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if (n->flags & KDBUS_NAME_IN_QUEUE)
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return 0;
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return 1;
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}
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static int bus_request_name_dbus1(sd_bus *bus, const char *name, uint64_t flags) {
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_cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
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uint32_t ret, param = 0;
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int r;
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assert(bus);
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assert(name);
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if (flags & SD_BUS_NAME_ALLOW_REPLACEMENT)
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param |= BUS_NAME_ALLOW_REPLACEMENT;
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if (flags & SD_BUS_NAME_REPLACE_EXISTING)
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param |= BUS_NAME_REPLACE_EXISTING;
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if (!(flags & SD_BUS_NAME_QUEUE))
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param |= BUS_NAME_DO_NOT_QUEUE;
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r = sd_bus_call_method(
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bus,
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"org.freedesktop.DBus",
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"/org/freedesktop/DBus",
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"org.freedesktop.DBus",
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"RequestName",
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NULL,
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&reply,
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"su",
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name,
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param);
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if (r < 0)
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return r;
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r = sd_bus_message_read(reply, "u", &ret);
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if (r < 0)
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return r;
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if (ret == BUS_NAME_ALREADY_OWNER)
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return -EALREADY;
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else if (ret == BUS_NAME_EXISTS)
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return -EEXIST;
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else if (ret == BUS_NAME_IN_QUEUE)
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return 0;
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else if (ret == BUS_NAME_PRIMARY_OWNER)
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return 1;
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return -EIO;
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}
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_public_ int sd_bus_request_name(sd_bus *bus, const char *name, uint64_t flags) {
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assert_return(bus, -EINVAL);
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assert_return(name, -EINVAL);
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assert_return(bus->bus_client, -EINVAL);
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assert_return(BUS_IS_OPEN(bus->state), -ENOTCONN);
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assert_return(!bus_pid_changed(bus), -ECHILD);
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assert_return(!(flags & ~(SD_BUS_NAME_ALLOW_REPLACEMENT|SD_BUS_NAME_REPLACE_EXISTING|SD_BUS_NAME_QUEUE)), -EINVAL);
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assert_return(service_name_is_valid(name), -EINVAL);
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assert_return(name[0] != ':', -EINVAL);
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if (bus->is_kernel)
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return bus_request_name_kernel(bus, name, flags);
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else
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return bus_request_name_dbus1(bus, name, flags);
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}
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static int bus_release_name_kernel(sd_bus *bus, const char *name) {
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struct kdbus_cmd_name *n;
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size_t l;
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int r;
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assert(bus);
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assert(name);
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l = strlen(name);
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n = alloca0(offsetof(struct kdbus_cmd_name, name) + l + 1);
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n->size = offsetof(struct kdbus_cmd_name, name) + l + 1;
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memcpy(n->name, name, l+1);
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#ifdef HAVE_VALGRIND_MEMCHECK_H
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VALGRIND_MAKE_MEM_DEFINED(n, n->size);
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#endif
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r = ioctl(bus->input_fd, KDBUS_CMD_NAME_RELEASE, n);
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if (r < 0)
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return -errno;
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return n->flags;
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}
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static int bus_release_name_dbus1(sd_bus *bus, const char *name) {
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_cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
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uint32_t ret;
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int r;
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assert(bus);
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assert(name);
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r = sd_bus_call_method(
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bus,
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"org.freedesktop.DBus",
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"/org/freedesktop/DBus",
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"org.freedesktop.DBus",
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"ReleaseName",
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NULL,
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&reply,
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"s",
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name);
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if (r < 0)
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return r;
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r = sd_bus_message_read(reply, "u", &ret);
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if (r < 0)
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return r;
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if (ret == BUS_NAME_NON_EXISTENT)
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return -ESRCH;
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if (ret == BUS_NAME_NOT_OWNER)
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return -EADDRINUSE;
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if (ret == BUS_NAME_RELEASED)
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return 0;
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return -EINVAL;
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}
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_public_ int sd_bus_release_name(sd_bus *bus, const char *name) {
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assert_return(bus, -EINVAL);
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assert_return(name, -EINVAL);
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assert_return(bus->bus_client, -EINVAL);
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assert_return(BUS_IS_OPEN(bus->state), -ENOTCONN);
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assert_return(!bus_pid_changed(bus), -ECHILD);
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assert_return(service_name_is_valid(name), -EINVAL);
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assert_return(name[0] != ':', -EINVAL);
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if (bus->is_kernel)
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return bus_release_name_kernel(bus, name);
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else
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return bus_release_name_dbus1(bus, name);
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}
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static int kernel_get_list(sd_bus *bus, uint64_t flags, char ***x) {
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struct kdbus_cmd_name_list cmd = {};
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struct kdbus_name_list *name_list;
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struct kdbus_cmd_name *name;
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uint64_t previous_id = 0;
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int r;
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/* Caller will free half-constructed list on failure... */
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cmd.flags = flags;
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r = ioctl(bus->input_fd, KDBUS_CMD_NAME_LIST, &cmd);
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if (r < 0)
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return -errno;
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name_list = (struct kdbus_name_list *) ((uint8_t *) bus->kdbus_buffer + cmd.offset);
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KDBUS_ITEM_FOREACH(name, name_list, names) {
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if ((flags & KDBUS_NAME_LIST_UNIQUE) && name->owner_id != previous_id) {
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char *n;
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if (asprintf(&n, ":1.%llu", (unsigned long long) name->owner_id) < 0)
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return -ENOMEM;
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r = strv_push(x, n);
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if (r < 0) {
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free(n);
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return -ENOMEM;
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}
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previous_id = name->owner_id;
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}
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if (name->size > sizeof(*name) && service_name_is_valid(name->name)) {
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r = strv_extend(x, name->name);
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if (r < 0)
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return -ENOMEM;
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}
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}
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r = ioctl(bus->input_fd, KDBUS_CMD_FREE, &cmd.offset);
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if (r < 0)
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return -errno;
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return 0;
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}
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static int bus_list_names_kernel(sd_bus *bus, char ***acquired, char ***activatable) {
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_cleanup_strv_free_ char **x = NULL, **y = NULL;
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int r;
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if (acquired) {
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r = kernel_get_list(bus, KDBUS_NAME_LIST_UNIQUE | KDBUS_NAME_LIST_NAMES, &x);
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if (r < 0)
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return r;
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}
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if (activatable) {
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r = kernel_get_list(bus, KDBUS_NAME_LIST_ACTIVATORS, &y);
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if (r < 0)
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return r;
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*activatable = y;
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y = NULL;
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}
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if (acquired) {
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*acquired = x;
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x = NULL;
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}
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return 0;
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}
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static int bus_list_names_dbus1(sd_bus *bus, char ***acquired, char ***activatable) {
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_cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
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_cleanup_strv_free_ char **x = NULL, **y = NULL;
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int r;
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if (acquired) {
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r = sd_bus_call_method(
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bus,
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"org.freedesktop.DBus",
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"/org/freedesktop/DBus",
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"org.freedesktop.DBus",
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"ListNames",
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NULL,
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&reply,
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NULL);
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if (r < 0)
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return r;
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r = sd_bus_message_read_strv(reply, &x);
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if (r < 0)
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return r;
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reply = sd_bus_message_unref(reply);
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}
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if (activatable) {
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r = sd_bus_call_method(
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bus,
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"org.freedesktop.DBus",
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"/org/freedesktop/DBus",
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"org.freedesktop.DBus",
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"ListActivatableNames",
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NULL,
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&reply,
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NULL);
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if (r < 0)
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return r;
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r = sd_bus_message_read_strv(reply, &y);
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if (r < 0)
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return r;
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*activatable = y;
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y = NULL;
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}
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if (acquired) {
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*acquired = x;
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x = NULL;
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}
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return 0;
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}
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_public_ int sd_bus_list_names(sd_bus *bus, char ***acquired, char ***activatable) {
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assert_return(bus, -EINVAL);
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assert_return(acquired || activatable, -EINVAL);
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assert_return(BUS_IS_OPEN(bus->state), -ENOTCONN);
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assert_return(!bus_pid_changed(bus), -ECHILD);
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if (bus->is_kernel)
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return bus_list_names_kernel(bus, acquired, activatable);
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else
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return bus_list_names_dbus1(bus, acquired, activatable);
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}
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static int bus_get_owner_kdbus(
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sd_bus *bus,
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const char *name,
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uint64_t mask,
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sd_bus_creds **creds) {
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_cleanup_bus_creds_unref_ sd_bus_creds *c = NULL;
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struct kdbus_cmd_conn_info *cmd;
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struct kdbus_conn_info *conn_info;
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struct kdbus_item *item;
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size_t size;
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uint64_t m, id;
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int r;
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r = bus_kernel_parse_unique_name(name, &id);
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if (r < 0)
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return r;
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if (r > 0) {
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size = offsetof(struct kdbus_cmd_conn_info, name);
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cmd = alloca0(size);
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cmd->id = id;
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} else {
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size = offsetof(struct kdbus_cmd_conn_info, name) + strlen(name) + 1;
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cmd = alloca0(size);
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strcpy(cmd->name, name);
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}
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cmd->flags = KDBUS_ATTACH_NAMES;
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cmd->size = size;
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r = ioctl(bus->input_fd, KDBUS_CMD_CONN_INFO, cmd);
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if (r < 0)
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return -errno;
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|
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conn_info = (struct kdbus_conn_info *) ((uint8_t *) bus->kdbus_buffer + cmd->offset);
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|
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/* Non-activated names are considered not available */
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if (conn_info->flags & KDBUS_HELLO_ACTIVATOR)
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return name[0] == ':' ? -ENXIO : -ENOENT;
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|
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c = bus_creds_new();
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if (!c)
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return -ENOMEM;
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|
|
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if (mask & SD_BUS_CREDS_UNIQUE_NAME) {
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if (asprintf(&c->unique_name, ":1.%llu", (unsigned long long) conn_info->id) < 0)
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return -ENOMEM;
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|
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c->mask |= SD_BUS_CREDS_UNIQUE_NAME;
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}
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KDBUS_ITEM_FOREACH(item, conn_info, items) {
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|
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switch (item->type) {
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case KDBUS_ITEM_CREDS:
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m = (SD_BUS_CREDS_UID | SD_BUS_CREDS_GID | SD_BUS_CREDS_PID) & mask;
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|
|
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if (m) {
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c->uid = (uid_t) item->creds.uid;
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c->pid = (pid_t) item->creds.pid;
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c->gid = (gid_t) item->creds.gid;
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c->mask |= m;
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}
|
|
|
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if (mask & SD_BUS_CREDS_TID && item->creds.tid > 0) {
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c->tid = (pid_t) item->creds.tid;
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c->mask |= SD_BUS_CREDS_TID;
|
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}
|
|
|
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if (mask & SD_BUS_CREDS_PID_STARTTIME && item->creds.starttime > 0) {
|
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c->pid_starttime = item->creds.starttime;
|
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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;
|
|
}
|
|
|
|
if (!bus->cgroup_root) {
|
|
r = cg_get_root_path(&bus->cgroup_root);
|
|
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;
|
|
}
|
|
}
|
|
|
|
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;
|
|
size_t sz;
|
|
|
|
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_IS_OPEN(bus->state), -ENOTCONN);
|
|
assert_return(!bus_pid_changed(bus), -ECHILD);
|
|
assert_return(service_name_is_valid(name), -EINVAL);
|
|
assert_return(bus->bus_client, -ENODATA);
|
|
|
|
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(sz);
|
|
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(sz);
|
|
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,
|
|
uint64_t id,
|
|
struct bus_match_component *components,
|
|
unsigned n_components,
|
|
uint64_t cookie) {
|
|
|
|
struct kdbus_cmd_match *m;
|
|
struct kdbus_item *item;
|
|
uint64_t bloom[BLOOM_SIZE/8];
|
|
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);
|
|
|
|
zero(bloom);
|
|
|
|
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, "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, "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, "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, "path", c->value_str);
|
|
using_bloom = true;
|
|
break;
|
|
|
|
case BUS_MATCH_PATH_NAMESPACE:
|
|
if (!streq(c->value_str, "/")) {
|
|
bloom_add_pair(bloom, "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, 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, 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, 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) + BLOOM_SIZE);
|
|
|
|
m = alloca0(sz);
|
|
m->size = sz;
|
|
m->cookie = cookie;
|
|
m->owner_id = id;
|
|
|
|
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) + BLOOM_SIZE;
|
|
item->type = KDBUS_ITEM_BLOOM;
|
|
memcpy(item->data64, bloom, 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;
|
|
}
|
|
|
|
static int bus_add_match_internal_dbus1(
|
|
sd_bus *bus,
|
|
const char *match) {
|
|
|
|
assert(bus);
|
|
assert(match);
|
|
|
|
return sd_bus_call_method(
|
|
bus,
|
|
"org.freedesktop.DBus",
|
|
"/org/freedesktop/DBus",
|
|
"org.freedesktop.DBus",
|
|
"AddMatch",
|
|
NULL,
|
|
NULL,
|
|
"s",
|
|
match);
|
|
}
|
|
|
|
int bus_add_match_internal(
|
|
sd_bus *bus,
|
|
const char *match,
|
|
struct bus_match_component *components,
|
|
unsigned n_components,
|
|
uint64_t cookie) {
|
|
|
|
assert(bus);
|
|
assert(match);
|
|
|
|
if (bus->is_kernel)
|
|
return bus_add_match_internal_kernel(bus, 0, components, n_components, cookie);
|
|
else
|
|
return bus_add_match_internal_dbus1(bus, match);
|
|
}
|
|
|
|
int bus_remove_match_internal_kernel(
|
|
sd_bus *bus,
|
|
uint64_t id,
|
|
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;
|
|
m.owner_id = id;
|
|
|
|
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) {
|
|
|
|
assert(bus);
|
|
assert(match);
|
|
|
|
return sd_bus_call_method(
|
|
bus,
|
|
"org.freedesktop.DBus",
|
|
"/org/freedesktop/DBus",
|
|
"org.freedesktop.DBus",
|
|
"RemoveMatch",
|
|
NULL,
|
|
NULL,
|
|
"s",
|
|
match);
|
|
}
|
|
|
|
int bus_remove_match_internal(
|
|
sd_bus *bus,
|
|
const char *match,
|
|
uint64_t cookie) {
|
|
|
|
assert(bus);
|
|
assert(match);
|
|
|
|
if (bus->is_kernel)
|
|
return bus_remove_match_internal_kernel(bus, 0, 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_IS_OPEN(bus->state), -ENOTCONN);
|
|
assert_return(!bus_pid_changed(bus), -ECHILD);
|
|
assert_return(service_name_is_valid(name), -EINVAL);
|
|
|
|
if (streq_ptr(name, bus->unique_name))
|
|
return sd_id128_get_machine(machine);
|
|
|
|
r = sd_bus_message_new_method_call(
|
|
bus,
|
|
name,
|
|
"/",
|
|
"org.freedesktop.DBus.Peer",
|
|
"GetMachineId", &m);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = sd_bus_message_set_no_auto_start(m, true);
|
|
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);
|
|
}
|