bus-control.c revision c78196699d3d805b2237896a1d2b8efeec6068d0
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright 2013 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#ifdef HAVE_VALGRIND_MEMCHECK_H
#include <valgrind/memcheck.h>
#endif
#include <stddef.h>
#include <errno.h>
#include "strv.h"
#include "sd-bus.h"
#include "bus-internal.h"
#include "bus-message.h"
#include "bus-control.h"
#include "bus-bloom.h"
int sd_bus_get_unique_name(sd_bus *bus, const char **unique) {
int r;
if (!bus)
return -EINVAL;
if (!unique)
return -EINVAL;
if (bus_pid_changed(bus))
return -ECHILD;
r = bus_ensure_running(bus);
if (r < 0)
return r;
*unique = bus->unique_name;
return 0;
}
int sd_bus_request_name(sd_bus *bus, const char *name, int flags) {
_cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
uint32_t ret;
int r;
if (!bus)
return -EINVAL;
if (!name)
return -EINVAL;
if (!bus->bus_client)
return -EINVAL;
if (!BUS_IS_OPEN(bus->state))
return -ENOTCONN;
if (bus_pid_changed(bus))
return -ECHILD;
if (bus->is_kernel) {
struct kdbus_cmd_name *n;
size_t l;
l = strlen(name);
n = alloca0(offsetof(struct kdbus_cmd_name, name) + l + 1);
n->size = offsetof(struct kdbus_cmd_name, name) + l + 1;
n->name_flags = flags;
memcpy(n->name, name, l+1);
#ifdef HAVE_VALGRIND_MEMCHECK_H
VALGRIND_MAKE_MEM_DEFINED(n, n->size);
#endif
r = ioctl(bus->input_fd, KDBUS_CMD_NAME_ACQUIRE, n);
if (r < 0)
return -errno;
return n->name_flags;
} else {
r = sd_bus_call_method(
bus,
"org.freedesktop.DBus",
"/",
"org.freedesktop.DBus",
"RequestName",
NULL,
&reply,
"su",
name,
flags);
if (r < 0)
return r;
r = sd_bus_message_read(reply, "u", &ret);
if (r < 0)
return r;
return ret;
}
}
int sd_bus_release_name(sd_bus *bus, const char *name) {
_cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
uint32_t ret;
int r;
if (!bus)
return -EINVAL;
if (!name)
return -EINVAL;
if (!bus->bus_client)
return -EINVAL;
if (!BUS_IS_OPEN(bus->state))
return -ENOTCONN;
if (bus_pid_changed(bus))
return -ECHILD;
if (bus->is_kernel) {
struct kdbus_cmd_name *n;
size_t l;
l = strlen(name);
n = alloca0(offsetof(struct kdbus_cmd_name, name) + l + 1);
n->size = offsetof(struct kdbus_cmd_name, name) + l + 1;
memcpy(n->name, name, l+1);
#ifdef HAVE_VALGRIND_MEMCHECK_H
VALGRIND_MAKE_MEM_DEFINED(n, n->size);
#endif
r = ioctl(bus->input_fd, KDBUS_CMD_NAME_RELEASE, n);
if (r < 0)
return -errno;
return n->name_flags;
} else {
r = sd_bus_call_method(
bus,
"org.freedesktop.DBus",
"/",
"org.freedesktop.DBus",
"ReleaseName",
NULL,
&reply,
"s",
name);
if (r < 0)
return r;
r = sd_bus_message_read(reply, "u", &ret);
if (r < 0)
return r;
}
return ret;
}
int sd_bus_list_names(sd_bus *bus, char ***l) {
_cleanup_bus_message_unref_ sd_bus_message *reply1 = NULL, *reply2 = NULL;
char **x = NULL;
int r;
if (!bus)
return -EINVAL;
if (!l)
return -EINVAL;
if (!BUS_IS_OPEN(bus->state))
return -ENOTCONN;
if (bus_pid_changed(bus))
return -ECHILD;
r = sd_bus_call_method(
bus,
"org.freedesktop.DBus",
"/",
"org.freedesktop.DBus",
"ListNames",
NULL,
&reply1,
NULL);
if (r < 0)
return r;
r = sd_bus_call_method(
bus,
"org.freedesktop.DBus",
"/",
"org.freedesktop.DBus",
"ListActivatableNames",
NULL,
&reply2,
NULL);
if (r < 0)
return r;
r = bus_message_read_strv_extend(reply1, &x);
if (r < 0) {
strv_free(x);
return r;
}
r = bus_message_read_strv_extend(reply2, &x);
if (r < 0) {
strv_free(x);
return r;
}
*l = strv_uniq(x);
return 0;
}
int sd_bus_get_owner(sd_bus *bus, const char *name, char **owner) {
_cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
const char *found;
int r;
if (!bus)
return -EINVAL;
if (!name)
return -EINVAL;
if (!BUS_IS_OPEN(bus->state))
return -ENOTCONN;
if (bus_pid_changed(bus))
return -ECHILD;
r = sd_bus_call_method(
bus,
"org.freedesktop.DBus",
"/",
"org.freedesktop.DBus",
"GetNameOwner",
NULL,
&reply,
"s",
name);
if (r < 0)
return r;
r = sd_bus_message_read(reply, "s", &found);
if (r < 0)
return r;
if (owner) {
char *t;
t = strdup(found);
if (!t)
return -ENOMEM;
*owner = t;
}
return 0;
}
int sd_bus_get_owner_uid(sd_bus *bus, const char *name, uid_t *uid) {
_cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
uint32_t u;
int r;
if (!bus)
return -EINVAL;
if (!name)
return -EINVAL;
if (!uid)
return -EINVAL;
if (!BUS_IS_OPEN(bus->state))
return -ENOTCONN;
if (bus_pid_changed(bus))
return -ECHILD;
r = sd_bus_call_method(
bus,
"org.freedesktop.DBus",
"/",
"org.freedesktop.DBus",
"GetConnectionUnixUser",
NULL,
&reply,
"s",
name);
if (r < 0)
return r;
r = sd_bus_message_read(reply, "u", &u);
if (r < 0)
return r;
*uid = (uid_t) u;
return 0;
}
int sd_bus_get_owner_pid(sd_bus *bus, const char *name, pid_t *pid) {
_cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
uint32_t u;
int r;
if (!bus)
return -EINVAL;
if (!name)
return -EINVAL;
if (!pid)
return -EINVAL;
if (!BUS_IS_OPEN(bus->state))
return -ENOTCONN;
if (bus_pid_changed(bus))
return -ECHILD;
r = sd_bus_call_method(
bus,
"org.freedesktop.DBus",
"/",
"org.freedesktop.DBus",
"GetConnectionUnixProcessID",
NULL,
&reply,
"s",
name);
if (r < 0)
return r;
r = sd_bus_message_read(reply, "u", &u);
if (r < 0)
return r;
if (u == 0)
return -EIO;
*pid = (uid_t) u;
return 0;
}
int bus_add_match_internal(
sd_bus *bus,
const char *match,
struct bus_match_component *components,
unsigned n_components,
uint64_t cookie) {
int r;
assert(bus);
assert(match);
if (bus->is_kernel) {
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_SRC_ID_ANY;
bool using_bloom = false;
unsigned i;
zero(bloom);
sz = 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:
r = bus_kernel_parse_unique_name(c->value_str, &src_id);
if (r < 0)
return r;
if (r > 0) {
sender = c->value_str;
sender_length = strlen(sender);
sz += ALIGN8(offsetof(struct kdbus_item, str) + sender_length + 1);
}
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_INTERFACE:
bloom_add_pair(bloom, "interface", c->value_str);
using_bloom = true;
break;
case BUS_MATCH_MEMBER:
bloom_add_pair(bloom, "member", c->value_str);
using_bloom = true;
break;
case BUS_MATCH_PATH:
bloom_add_pair(bloom, "path", c->value_str);
using_bloom = true;
break;
case BUS_MATCH_PATH_NAMESPACE:
bloom_add_pair(bloom, "path-slash-prefix", c->value_str);
using_bloom = true;
break;
case BUS_MATCH_ARG...BUS_MATCH_ARG_LAST:
case BUS_MATCH_ARG_PATH...BUS_MATCH_ARG_PATH_LAST:
case BUS_MATCH_ARG_NAMESPACE...BUS_MATCH_ARG_NAMESPACE_LAST:
case BUS_MATCH_MESSAGE_TYPE:
assert_not_reached("FIXME!");
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->src_id = src_id;
item = m->items;
if (using_bloom) {
item->size = offsetof(struct kdbus_item, data64) + BLOOM_SIZE;
item->type = KDBUS_MATCH_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_MATCH_SRC_NAME;
memcpy(item->str, sender, sender_length + 1);
}
r = ioctl(bus->input_fd, KDBUS_CMD_MATCH_ADD, m);
if (r < 0)
return -errno;
} else {
return sd_bus_call_method(
bus,
"org.freedesktop.DBus",
"/",
"org.freedesktop.DBus",
"AddMatch",
NULL,
NULL,
"s",
match);
}
return 0;
}
int bus_remove_match_internal(
sd_bus *bus,
const char *match,
uint64_t cookie) {
int r;
assert(bus);
assert(match);
if (bus->is_kernel) {
struct kdbus_cmd_match m;
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;
} else {
return sd_bus_call_method(
bus,
"org.freedesktop.DBus",
"/",
"org.freedesktop.DBus",
"RemoveMatch",
NULL,
NULL,
"s",
match);
}
return 0;
}
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;
const char *mid;
int r;
if (!bus)
return -EINVAL;
if (!name)
return -EINVAL;
if (!BUS_IS_OPEN(bus->state))
return -ENOTCONN;
if (bus_pid_changed(bus))
return -ECHILD;
if (streq_ptr(name, bus->unique_name))
return sd_id128_get_machine(machine);
r = sd_bus_call_method(bus,
name,
"/",
"org.freedesktop.DBus.Peer",
"GetMachineId",
NULL,
&reply,
NULL);
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);
}