573 lines
18 KiB
C
573 lines
18 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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int sd_bus_get_unique_name(sd_bus *bus, const char **unique) {
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int r;
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if (!bus)
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return -EINVAL;
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if (!unique)
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return -EINVAL;
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if (bus_pid_changed(bus))
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return -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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int sd_bus_request_name(sd_bus *bus, const char *name, int flags) {
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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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if (!bus)
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return -EINVAL;
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if (!name)
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return -EINVAL;
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if (!bus->bus_client)
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return -EINVAL;
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if (!BUS_IS_OPEN(bus->state))
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return -ENOTCONN;
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if (bus_pid_changed(bus))
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return -ECHILD;
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if (bus->is_kernel) {
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struct kdbus_cmd_name *n;
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size_t l;
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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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n->name_flags = 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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return n->name_flags;
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} else {
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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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"/",
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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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flags);
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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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return ret;
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}
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}
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int sd_bus_release_name(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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if (!bus)
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return -EINVAL;
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if (!name)
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return -EINVAL;
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if (!bus->bus_client)
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return -EINVAL;
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if (!BUS_IS_OPEN(bus->state))
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return -ENOTCONN;
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if (bus_pid_changed(bus))
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return -ECHILD;
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if (bus->is_kernel) {
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struct kdbus_cmd_name *n;
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size_t l;
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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->name_flags;
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} else {
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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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"/",
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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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}
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return ret;
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}
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int sd_bus_list_names(sd_bus *bus, char ***l) {
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_cleanup_bus_message_unref_ sd_bus_message *reply1 = NULL, *reply2 = NULL;
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char **x = NULL;
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int r;
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if (!bus)
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return -EINVAL;
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if (!l)
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return -EINVAL;
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if (!BUS_IS_OPEN(bus->state))
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return -ENOTCONN;
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if (bus_pid_changed(bus))
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return -ECHILD;
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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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"/",
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"org.freedesktop.DBus",
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"ListNames",
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NULL,
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&reply1,
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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_call_method(
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bus,
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"org.freedesktop.DBus",
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"/",
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"org.freedesktop.DBus",
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"ListActivatableNames",
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NULL,
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&reply2,
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NULL);
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if (r < 0)
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return r;
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r = bus_message_read_strv_extend(reply1, &x);
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if (r < 0) {
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strv_free(x);
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return r;
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}
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r = bus_message_read_strv_extend(reply2, &x);
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if (r < 0) {
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strv_free(x);
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return r;
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}
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*l = strv_uniq(x);
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return 0;
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}
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int sd_bus_get_owner(sd_bus *bus, const char *name, char **owner) {
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_cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
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const char *found;
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int r;
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if (!bus)
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return -EINVAL;
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if (!name)
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return -EINVAL;
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if (!BUS_IS_OPEN(bus->state))
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return -ENOTCONN;
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if (bus_pid_changed(bus))
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return -ECHILD;
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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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"/",
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"org.freedesktop.DBus",
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"GetNameOwner",
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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, "s", &found);
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if (r < 0)
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return r;
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if (owner) {
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char *t;
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t = strdup(found);
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if (!t)
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return -ENOMEM;
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*owner = t;
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}
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return 0;
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}
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int sd_bus_get_owner_uid(sd_bus *bus, const char *name, uid_t *uid) {
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_cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
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uint32_t u;
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int r;
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if (!bus)
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return -EINVAL;
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if (!name)
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return -EINVAL;
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if (!uid)
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return -EINVAL;
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if (!BUS_IS_OPEN(bus->state))
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return -ENOTCONN;
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if (bus_pid_changed(bus))
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return -ECHILD;
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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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"/",
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"org.freedesktop.DBus",
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"GetConnectionUnixUser",
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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", &u);
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if (r < 0)
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return r;
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*uid = (uid_t) u;
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return 0;
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}
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int sd_bus_get_owner_pid(sd_bus *bus, const char *name, pid_t *pid) {
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_cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
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uint32_t u;
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int r;
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if (!bus)
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return -EINVAL;
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if (!name)
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return -EINVAL;
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if (!pid)
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return -EINVAL;
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if (!BUS_IS_OPEN(bus->state))
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return -ENOTCONN;
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if (bus_pid_changed(bus))
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return -ECHILD;
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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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"/",
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"org.freedesktop.DBus",
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"GetConnectionUnixProcessID",
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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", &u);
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if (r < 0)
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return r;
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if (u == 0)
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return -EIO;
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*pid = (uid_t) u;
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return 0;
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}
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int bus_add_match_internal(
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sd_bus *bus,
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const char *match,
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struct bus_match_component *components,
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unsigned n_components,
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uint64_t cookie) {
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int r;
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assert(bus);
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assert(match);
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if (bus->is_kernel) {
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struct kdbus_cmd_match *m;
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struct kdbus_item *item;
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uint64_t bloom[BLOOM_SIZE/8];
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size_t sz;
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const char *sender = NULL;
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size_t sender_length = 0;
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uint64_t src_id = KDBUS_MATCH_SRC_ID_ANY;
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bool using_bloom = false;
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unsigned i;
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zero(bloom);
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sz = offsetof(struct kdbus_cmd_match, items);
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for (i = 0; i < n_components; i++) {
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struct bus_match_component *c = &components[i];
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switch (c->type) {
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case BUS_MATCH_SENDER:
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r = bus_kernel_parse_unique_name(c->value_str, &src_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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sender = c->value_str;
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sender_length = strlen(sender);
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sz += ALIGN8(offsetof(struct kdbus_item, str) + sender_length + 1);
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}
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break;
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case BUS_MATCH_MESSAGE_TYPE:
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bloom_add_pair(bloom, "message-type", bus_message_type_to_string(c->value_u8));
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using_bloom = true;
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break;
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case BUS_MATCH_INTERFACE:
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bloom_add_pair(bloom, "interface", c->value_str);
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using_bloom = true;
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break;
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case BUS_MATCH_MEMBER:
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bloom_add_pair(bloom, "member", c->value_str);
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using_bloom = true;
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break;
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case BUS_MATCH_PATH:
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bloom_add_pair(bloom, "path", c->value_str);
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using_bloom = true;
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break;
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case BUS_MATCH_PATH_NAMESPACE:
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bloom_add_pair(bloom, "path-slash-prefix", c->value_str);
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using_bloom = true;
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break;
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case BUS_MATCH_ARG...BUS_MATCH_ARG_LAST: {
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char buf[sizeof("arg")-1 + 2 + 1];
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snprintf(buf, sizeof(buf), "arg%u", c->type - BUS_MATCH_ARG);
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bloom_add_pair(bloom, buf, c->value_str);
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using_bloom = true;
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break;
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}
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case BUS_MATCH_ARG_PATH...BUS_MATCH_ARG_PATH_LAST: {
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char buf[sizeof("arg")-1 + 2 + sizeof("-slash-prefix")];
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snprintf(buf, sizeof(buf), "arg%u-slash-prefix", c->type - BUS_MATCH_ARG_PATH);
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bloom_add_pair(bloom, buf, c->value_str);
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using_bloom = true;
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break;
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}
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case BUS_MATCH_ARG_NAMESPACE...BUS_MATCH_ARG_NAMESPACE_LAST: {
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char buf[sizeof("arg")-1 + 2 + sizeof("-dot-prefix")];
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snprintf(buf, sizeof(buf), "arg%u-dot-prefix", c->type - BUS_MATCH_ARG_NAMESPACE);
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bloom_add_pair(bloom, buf, c->value_str);
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using_bloom = true;
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break;
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}
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case BUS_MATCH_DESTINATION:
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/* The bloom filter does not include
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the destination, since it is only
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available for broadcast messages
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which do not carry a destination
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since they are undirected. */
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break;
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case BUS_MATCH_ROOT:
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case BUS_MATCH_VALUE:
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case BUS_MATCH_LEAF:
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case _BUS_MATCH_NODE_TYPE_MAX:
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case _BUS_MATCH_NODE_TYPE_INVALID:
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assert_not_reached("Invalid match type?");
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}
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}
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if (using_bloom)
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sz += ALIGN8(offsetof(struct kdbus_item, data64) + BLOOM_SIZE);
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m = alloca0(sz);
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m->size = sz;
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m->cookie = cookie;
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m->src_id = src_id;
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item = m->items;
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if (using_bloom) {
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item->size = offsetof(struct kdbus_item, data64) + BLOOM_SIZE;
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item->type = KDBUS_MATCH_BLOOM;
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memcpy(item->data64, bloom, BLOOM_SIZE);
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item = KDBUS_ITEM_NEXT(item);
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}
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if (sender) {
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item->size = offsetof(struct kdbus_item, str) + sender_length + 1;
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item->type = KDBUS_MATCH_SRC_NAME;
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memcpy(item->str, sender, sender_length + 1);
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}
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r = ioctl(bus->input_fd, KDBUS_CMD_MATCH_ADD, m);
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if (r < 0)
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return -errno;
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} else {
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return sd_bus_call_method(
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bus,
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"org.freedesktop.DBus",
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"/",
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"org.freedesktop.DBus",
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"AddMatch",
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NULL,
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NULL,
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"s",
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match);
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}
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return 0;
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}
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int bus_remove_match_internal(
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sd_bus *bus,
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const char *match,
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uint64_t cookie) {
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int r;
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assert(bus);
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assert(match);
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if (bus->is_kernel) {
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struct kdbus_cmd_match m;
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zero(m);
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m.size = offsetof(struct kdbus_cmd_match, items);
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m.cookie = cookie;
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r = ioctl(bus->input_fd, KDBUS_CMD_MATCH_REMOVE, &m);
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if (r < 0)
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return -errno;
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} else {
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return sd_bus_call_method(
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bus,
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"org.freedesktop.DBus",
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"/",
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"org.freedesktop.DBus",
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"RemoveMatch",
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NULL,
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NULL,
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"s",
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match);
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}
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return 0;
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}
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int sd_bus_get_owner_machine_id(sd_bus *bus, const char *name, sd_id128_t *machine) {
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_cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
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const char *mid;
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int r;
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if (!bus)
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return -EINVAL;
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if (!name)
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return -EINVAL;
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if (!BUS_IS_OPEN(bus->state))
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return -ENOTCONN;
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if (bus_pid_changed(bus))
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return -ECHILD;
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if (streq_ptr(name, bus->unique_name))
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return sd_id128_get_machine(machine);
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r = sd_bus_call_method(bus,
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name,
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"/",
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"org.freedesktop.DBus.Peer",
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"GetMachineId",
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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(reply, "s", &mid);
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if (r < 0)
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return r;
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return sd_id128_from_string(mid, machine);
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}
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