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systemd/src/core/dbus.c
Lennart Poettering fc2fffe770 tree-wide: introduce new SOCKADDR_UN_LEN() macro, and use it everywhere 
The macro determines the right length of a AF_UNIX "struct sockaddr_un" to pass to
connect() or bind(). It automatically figures out if the socket refers to an
abstract namespace socket, or a socket in the file system, and properly handles
the full length of the path field.

This macro is not only safer, but also simpler to use, than the usual
offsetof() + strlen() logic.
2016-05-05 22:24:36 +02:00

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/***
This file is part of systemd.
Copyright 2010 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <errno.h>
#include <sys/epoll.h>
#include <unistd.h>
#include "sd-bus.h"
#include "alloc-util.h"
#include "bus-common-errors.h"
#include "bus-error.h"
#include "bus-internal.h"
#include "bus-util.h"
#include "dbus-cgroup.h"
#include "dbus-execute.h"
#include "dbus-job.h"
#include "dbus-kill.h"
#include "dbus-manager.h"
#include "dbus-unit.h"
#include "dbus.h"
#include "fd-util.h"
#include "log.h"
#include "missing.h"
#include "mkdir.h"
#include "selinux-access.h"
#include "special.h"
#include "string-util.h"
#include "strv.h"
#include "strxcpyx.h"
#include "user-util.h"
#define CONNECTIONS_MAX 4096
static void destroy_bus(Manager *m, sd_bus **bus);
int bus_send_queued_message(Manager *m) {
int r;
assert(m);
if (!m->queued_message)
return 0;
/* If we cannot get rid of this message we won't dispatch any
* D-Bus messages, so that we won't end up wanting to queue
* another message. */
r = sd_bus_send(NULL, m->queued_message, NULL);
if (r < 0)
log_warning_errno(r, "Failed to send queued message: %m");
m->queued_message = sd_bus_message_unref(m->queued_message);
return 0;
}
int bus_forward_agent_released(Manager *m, const char *path) {
int r;
assert(m);
assert(path);
if (!MANAGER_IS_SYSTEM(m))
return 0;
if (!m->system_bus)
return 0;
/* If we are running a system instance we forward the agent message on the system bus, so that the user
* instances get notified about this, too */
r = sd_bus_emit_signal(m->system_bus,
"/org/freedesktop/systemd1/agent",
"org.freedesktop.systemd1.Agent",
"Released",
"s", path);
if (r < 0)
return log_warning_errno(r, "Failed to propagate agent release message: %m");
return 1;
}
static int signal_agent_released(sd_bus_message *message, void *userdata, sd_bus_error *error) {
_cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL;
Manager *m = userdata;
const char *cgroup;
uid_t sender_uid;
int r;
assert(message);
assert(m);
/* only accept org.freedesktop.systemd1.Agent from UID=0 */
r = sd_bus_query_sender_creds(message, SD_BUS_CREDS_EUID, &creds);
if (r < 0)
return r;
r = sd_bus_creds_get_euid(creds, &sender_uid);
if (r < 0 || sender_uid != 0)
return 0;
/* parse 'cgroup-empty' notification */
r = sd_bus_message_read(message, "s", &cgroup);
if (r < 0) {
bus_log_parse_error(r);
return 0;
}
manager_notify_cgroup_empty(m, cgroup);
return 0;
}
static int signal_disconnected(sd_bus_message *message, void *userdata, sd_bus_error *error) {
Manager *m = userdata;
sd_bus *bus;
assert(message);
assert(m);
assert_se(bus = sd_bus_message_get_bus(message));
if (bus == m->api_bus)
destroy_bus(m, &m->api_bus);
if (bus == m->system_bus)
destroy_bus(m, &m->system_bus);
if (set_remove(m->private_buses, bus)) {
log_debug("Got disconnect on private connection.");
destroy_bus(m, &bus);
}
return 0;
}
static int signal_activation_request(sd_bus_message *message, void *userdata, sd_bus_error *ret_error) {
_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
_cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
Manager *m = userdata;
const char *name;
Unit *u;
int r;
assert(message);
assert(m);
r = sd_bus_message_read(message, "s", &name);
if (r < 0) {
bus_log_parse_error(r);
return 0;
}
if (manager_unit_inactive_or_pending(m, SPECIAL_DBUS_SERVICE) ||
manager_unit_inactive_or_pending(m, SPECIAL_DBUS_SOCKET)) {
r = sd_bus_error_setf(&error, BUS_ERROR_SHUTTING_DOWN, "Refusing activation, D-Bus is shutting down.");
goto failed;
}
r = manager_load_unit(m, name, NULL, &error, &u);
if (r < 0)
goto failed;
if (u->refuse_manual_start) {
r = sd_bus_error_setf(&error, BUS_ERROR_ONLY_BY_DEPENDENCY, "Operation refused, %s may be requested by dependency only.", u->id);
goto failed;
}
r = manager_add_job(m, JOB_START, u, JOB_REPLACE, &error, NULL);
if (r < 0)
goto failed;
/* Successfully queued, that's it for us */
return 0;
failed:
if (!sd_bus_error_is_set(&error))
sd_bus_error_set_errno(&error, r);
log_debug("D-Bus activation failed for %s: %s", name, bus_error_message(&error, r));
r = sd_bus_message_new_signal(sd_bus_message_get_bus(message), &reply, "/org/freedesktop/systemd1", "org.freedesktop.systemd1.Activator", "ActivationFailure");
if (r < 0) {
bus_log_create_error(r);
return 0;
}
r = sd_bus_message_append(reply, "sss", name, error.name, error.message);
if (r < 0) {
bus_log_create_error(r);
return 0;
}
r = sd_bus_send_to(NULL, reply, "org.freedesktop.DBus", NULL);
if (r < 0)
return log_error_errno(r, "Failed to respond with to bus activation request: %m");
return 0;
}
#ifdef HAVE_SELINUX
static int mac_selinux_filter(sd_bus_message *message, void *userdata, sd_bus_error *error) {
Manager *m = userdata;
const char *verb, *path;
Unit *u = NULL;
Job *j;
int r;
assert(message);
/* Our own method calls are all protected individually with
* selinux checks, but the built-in interfaces need to be
* protected too. */
if (sd_bus_message_is_method_call(message, "org.freedesktop.DBus.Properties", "Set"))
verb = "reload";
else if (sd_bus_message_is_method_call(message, "org.freedesktop.DBus.Introspectable", NULL) ||
sd_bus_message_is_method_call(message, "org.freedesktop.DBus.Properties", NULL) ||
sd_bus_message_is_method_call(message, "org.freedesktop.DBus.ObjectManager", NULL) ||
sd_bus_message_is_method_call(message, "org.freedesktop.DBus.Peer", NULL))
verb = "status";
else
return 0;
path = sd_bus_message_get_path(message);
if (object_path_startswith("/org/freedesktop/systemd1", path)) {
r = mac_selinux_access_check(message, verb, error);
if (r < 0)
return r;
return 0;
}
if (streq_ptr(path, "/org/freedesktop/systemd1/unit/self")) {
_cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL;
pid_t pid;
r = sd_bus_query_sender_creds(message, SD_BUS_CREDS_PID, &creds);
if (r < 0)
return 0;
r = sd_bus_creds_get_pid(creds, &pid);
if (r < 0)
return 0;
u = manager_get_unit_by_pid(m, pid);
} else {
r = manager_get_job_from_dbus_path(m, path, &j);
if (r >= 0)
u = j->unit;
else
manager_load_unit_from_dbus_path(m, path, NULL, &u);
}
if (!u)
return 0;
r = mac_selinux_unit_access_check(u, message, verb, error);
if (r < 0)
return r;
return 0;
}
#endif
static int bus_job_find(sd_bus *bus, const char *path, const char *interface, void *userdata, void **found, sd_bus_error *error) {
Manager *m = userdata;
Job *j;
int r;
assert(bus);
assert(path);
assert(interface);
assert(found);
assert(m);
r = manager_get_job_from_dbus_path(m, path, &j);
if (r < 0)
return 0;
*found = j;
return 1;
}
static int find_unit(Manager *m, sd_bus *bus, const char *path, Unit **unit, sd_bus_error *error) {
Unit *u;
int r;
assert(m);
assert(bus);
assert(path);
if (streq_ptr(path, "/org/freedesktop/systemd1/unit/self")) {
_cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL;
sd_bus_message *message;
pid_t pid;
message = sd_bus_get_current_message(bus);
if (!message)
return 0;
r = sd_bus_query_sender_creds(message, SD_BUS_CREDS_PID, &creds);
if (r < 0)
return r;
r = sd_bus_creds_get_pid(creds, &pid);
if (r < 0)
return r;
u = manager_get_unit_by_pid(m, pid);
} else {
r = manager_load_unit_from_dbus_path(m, path, error, &u);
if (r < 0)
return 0;
}
if (!u)
return 0;
*unit = u;
return 1;
}
static int bus_unit_find(sd_bus *bus, const char *path, const char *interface, void *userdata, void **found, sd_bus_error *error) {
Manager *m = userdata;
assert(bus);
assert(path);
assert(interface);
assert(found);
assert(m);
return find_unit(m, bus, path, (Unit**) found, error);
}
static int bus_unit_interface_find(sd_bus *bus, const char *path, const char *interface, void *userdata, void **found, sd_bus_error *error) {
Manager *m = userdata;
Unit *u;
int r;
assert(bus);
assert(path);
assert(interface);
assert(found);
assert(m);
r = find_unit(m, bus, path, &u, error);
if (r <= 0)
return r;
if (!streq_ptr(interface, unit_dbus_interface_from_type(u->type)))
return 0;
*found = u;
return 1;
}
static int bus_unit_cgroup_find(sd_bus *bus, const char *path, const char *interface, void *userdata, void **found, sd_bus_error *error) {
Manager *m = userdata;
Unit *u;
int r;
assert(bus);
assert(path);
assert(interface);
assert(found);
assert(m);
r = find_unit(m, bus, path, &u, error);
if (r <= 0)
return r;
if (!streq_ptr(interface, unit_dbus_interface_from_type(u->type)))
return 0;
if (!UNIT_HAS_CGROUP_CONTEXT(u))
return 0;
*found = u;
return 1;
}
static int bus_cgroup_context_find(sd_bus *bus, const char *path, const char *interface, void *userdata, void **found, sd_bus_error *error) {
Manager *m = userdata;
CGroupContext *c;
Unit *u;
int r;
assert(bus);
assert(path);
assert(interface);
assert(found);
assert(m);
r = find_unit(m, bus, path, &u, error);
if (r <= 0)
return r;
if (!streq_ptr(interface, unit_dbus_interface_from_type(u->type)))
return 0;
c = unit_get_cgroup_context(u);
if (!c)
return 0;
*found = c;
return 1;
}
static int bus_exec_context_find(sd_bus *bus, const char *path, const char *interface, void *userdata, void **found, sd_bus_error *error) {
Manager *m = userdata;
ExecContext *c;
Unit *u;
int r;
assert(bus);
assert(path);
assert(interface);
assert(found);
assert(m);
r = find_unit(m, bus, path, &u, error);
if (r <= 0)
return r;
if (!streq_ptr(interface, unit_dbus_interface_from_type(u->type)))
return 0;
c = unit_get_exec_context(u);
if (!c)
return 0;
*found = c;
return 1;
}
static int bus_kill_context_find(sd_bus *bus, const char *path, const char *interface, void *userdata, void **found, sd_bus_error *error) {
Manager *m = userdata;
KillContext *c;
Unit *u;
int r;
assert(bus);
assert(path);
assert(interface);
assert(found);
assert(m);
r = find_unit(m, bus, path, &u, error);
if (r <= 0)
return r;
if (!streq_ptr(interface, unit_dbus_interface_from_type(u->type)))
return 0;
c = unit_get_kill_context(u);
if (!c)
return 0;
*found = c;
return 1;
}
static int bus_job_enumerate(sd_bus *bus, const char *path, void *userdata, char ***nodes, sd_bus_error *error) {
_cleanup_free_ char **l = NULL;
Manager *m = userdata;
unsigned k = 0;
Iterator i;
Job *j;
l = new0(char*, hashmap_size(m->jobs)+1);
if (!l)
return -ENOMEM;
HASHMAP_FOREACH(j, m->jobs, i) {
l[k] = job_dbus_path(j);
if (!l[k])
return -ENOMEM;
k++;
}
assert(hashmap_size(m->jobs) == k);
*nodes = l;
l = NULL;
return k;
}
static int bus_unit_enumerate(sd_bus *bus, const char *path, void *userdata, char ***nodes, sd_bus_error *error) {
_cleanup_free_ char **l = NULL;
Manager *m = userdata;
unsigned k = 0;
Iterator i;
Unit *u;
l = new0(char*, hashmap_size(m->units)+1);
if (!l)
return -ENOMEM;
HASHMAP_FOREACH(u, m->units, i) {
l[k] = unit_dbus_path(u);
if (!l[k])
return -ENOMEM;
k++;
}
*nodes = l;
l = NULL;
return k;
}
static int bus_setup_api_vtables(Manager *m, sd_bus *bus) {
UnitType t;
int r;
assert(m);
assert(bus);
#ifdef HAVE_SELINUX
r = sd_bus_add_filter(bus, NULL, mac_selinux_filter, m);
if (r < 0)
return log_error_errno(r, "Failed to add SELinux access filter: %m");
#endif
r = sd_bus_add_object_vtable(bus, NULL, "/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager", bus_manager_vtable, m);
if (r < 0)
return log_error_errno(r, "Failed to register Manager vtable: %m");
r = sd_bus_add_fallback_vtable(bus, NULL, "/org/freedesktop/systemd1/job", "org.freedesktop.systemd1.Job", bus_job_vtable, bus_job_find, m);
if (r < 0)
return log_error_errno(r, "Failed to register Job vtable: %m");
r = sd_bus_add_node_enumerator(bus, NULL, "/org/freedesktop/systemd1/job", bus_job_enumerate, m);
if (r < 0)
return log_error_errno(r, "Failed to add job enumerator: %m");
r = sd_bus_add_fallback_vtable(bus, NULL, "/org/freedesktop/systemd1/unit", "org.freedesktop.systemd1.Unit", bus_unit_vtable, bus_unit_find, m);
if (r < 0)
return log_error_errno(r, "Failed to register Unit vtable: %m");
r = sd_bus_add_node_enumerator(bus, NULL, "/org/freedesktop/systemd1/unit", bus_unit_enumerate, m);
if (r < 0)
return log_error_errno(r, "Failed to add job enumerator: %m");
for (t = 0; t < _UNIT_TYPE_MAX; t++) {
const char *interface;
assert_se(interface = unit_dbus_interface_from_type(t));
r = sd_bus_add_fallback_vtable(bus, NULL, "/org/freedesktop/systemd1/unit", interface, unit_vtable[t]->bus_vtable, bus_unit_interface_find, m);
if (r < 0)
return log_error_errno(r, "Failed to register type specific vtable for %s: %m", interface);
if (unit_vtable[t]->cgroup_context_offset > 0) {
r = sd_bus_add_fallback_vtable(bus, NULL, "/org/freedesktop/systemd1/unit", interface, bus_unit_cgroup_vtable, bus_unit_cgroup_find, m);
if (r < 0)
return log_error_errno(r, "Failed to register control group unit vtable for %s: %m", interface);
r = sd_bus_add_fallback_vtable(bus, NULL, "/org/freedesktop/systemd1/unit", interface, bus_cgroup_vtable, bus_cgroup_context_find, m);
if (r < 0)
return log_error_errno(r, "Failed to register control group vtable for %s: %m", interface);
}
if (unit_vtable[t]->exec_context_offset > 0) {
r = sd_bus_add_fallback_vtable(bus, NULL, "/org/freedesktop/systemd1/unit", interface, bus_exec_vtable, bus_exec_context_find, m);
if (r < 0)
return log_error_errno(r, "Failed to register execute vtable for %s: %m", interface);
}
if (unit_vtable[t]->kill_context_offset > 0) {
r = sd_bus_add_fallback_vtable(bus, NULL, "/org/freedesktop/systemd1/unit", interface, bus_kill_vtable, bus_kill_context_find, m);
if (r < 0)
return log_error_errno(r, "Failed to register kill vtable for %s: %m", interface);
}
}
return 0;
}
static int bus_setup_disconnected_match(Manager *m, sd_bus *bus) {
int r;
assert(m);
assert(bus);
r = sd_bus_add_match(
bus,
NULL,
"sender='org.freedesktop.DBus.Local',"
"type='signal',"
"path='/org/freedesktop/DBus/Local',"
"interface='org.freedesktop.DBus.Local',"
"member='Disconnected'",
signal_disconnected, m);
if (r < 0)
return log_error_errno(r, "Failed to register match for Disconnected message: %m");
return 0;
}
static int bus_on_connection(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
_cleanup_(sd_bus_unrefp) sd_bus *bus = NULL;
_cleanup_close_ int nfd = -1;
Manager *m = userdata;
sd_id128_t id;
int r;
assert(s);
assert(m);
nfd = accept4(fd, NULL, NULL, SOCK_NONBLOCK|SOCK_CLOEXEC);
if (nfd < 0) {
log_warning_errno(errno, "Failed to accept private connection, ignoring: %m");
return 0;
}
if (set_size(m->private_buses) >= CONNECTIONS_MAX) {
log_warning("Too many concurrent connections, refusing");
return 0;
}
r = set_ensure_allocated(&m->private_buses, NULL);
if (r < 0) {
log_oom();
return 0;
}
r = sd_bus_new(&bus);
if (r < 0) {
log_warning_errno(r, "Failed to allocate new private connection bus: %m");
return 0;
}
r = sd_bus_set_fd(bus, nfd, nfd);
if (r < 0) {
log_warning_errno(r, "Failed to set fd on new connection bus: %m");
return 0;
}
nfd = -1;
r = bus_check_peercred(bus);
if (r < 0) {
log_warning_errno(r, "Incoming private connection from unprivileged client, refusing: %m");
return 0;
}
assert_se(sd_id128_randomize(&id) >= 0);
r = sd_bus_set_server(bus, 1, id);
if (r < 0) {
log_warning_errno(r, "Failed to enable server support for new connection bus: %m");
return 0;
}
r = sd_bus_negotiate_creds(bus, 1,
SD_BUS_CREDS_PID|SD_BUS_CREDS_UID|
SD_BUS_CREDS_EUID|SD_BUS_CREDS_EFFECTIVE_CAPS|
SD_BUS_CREDS_SELINUX_CONTEXT);
if (r < 0) {
log_warning_errno(r, "Failed to enable credentials for new connection: %m");
return 0;
}
r = sd_bus_start(bus);
if (r < 0) {
log_warning_errno(r, "Failed to start new connection bus: %m");
return 0;
}
r = sd_bus_attach_event(bus, m->event, SD_EVENT_PRIORITY_NORMAL);
if (r < 0) {
log_warning_errno(r, "Failed to attach new connection bus to event loop: %m");
return 0;
}
r = bus_setup_disconnected_match(m, bus);
if (r < 0)
return 0;
r = bus_setup_api_vtables(m, bus);
if (r < 0) {
log_warning_errno(r, "Failed to set up API vtables on new connection bus: %m");
return 0;
}
r = set_put(m->private_buses, bus);
if (r < 0) {
log_warning_errno(r, "Failed to add new connection bus to set: %m");
return 0;
}
bus = NULL;
log_debug("Accepted new private connection.");
return 0;
}
int manager_sync_bus_names(Manager *m, sd_bus *bus) {
_cleanup_strv_free_ char **names = NULL;
const char *name;
Iterator i;
Unit *u;
int r;
assert(m);
assert(bus);
r = sd_bus_list_names(bus, &names, NULL);
if (r < 0)
return log_error_errno(r, "Failed to get initial list of names: %m");
/* We have to synchronize the current bus names with the
* list of active services. To do this, walk the list of
* all units with bus names. */
HASHMAP_FOREACH_KEY(u, name, m->watch_bus, i) {
Service *s = SERVICE(u);
assert(s);
if (!streq_ptr(s->bus_name, name)) {
log_unit_warning(u, "Bus name has changed from %s → %s, ignoring.", s->bus_name, name);
continue;
}
/* Check if a service's bus name is in the list of currently
* active names */
if (strv_contains(names, name)) {
_cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL;
const char *unique;
/* If it is, determine its current owner */
r = sd_bus_get_name_creds(bus, name, SD_BUS_CREDS_UNIQUE_NAME, &creds);
if (r < 0) {
log_error_errno(r, "Failed to get bus name owner %s: %m", name);
continue;
}
r = sd_bus_creds_get_unique_name(creds, &unique);
if (r < 0) {
log_error_errno(r, "Failed to get unique name for %s: %m", name);
continue;
}
/* Now, let's compare that to the previous bus owner, and
* if it's still the same, all is fine, so just don't
* bother the service. Otherwise, the name has apparently
* changed, so synthesize a name owner changed signal. */
if (!streq_ptr(unique, s->bus_name_owner))
UNIT_VTABLE(u)->bus_name_owner_change(u, name, s->bus_name_owner, unique);
} else {
/* So, the name we're watching is not on the bus.
* This either means it simply hasn't appeared yet,
* or it was lost during the daemon reload.
* Check if the service has a stored name owner,
* and synthesize a name loss signal in this case. */
if (s->bus_name_owner)
UNIT_VTABLE(u)->bus_name_owner_change(u, name, s->bus_name_owner, NULL);
}
}
return 0;
}
static int bus_setup_api(Manager *m, sd_bus *bus) {
Iterator i;
char *name;
Unit *u;
int r;
assert(m);
assert(bus);
/* Let's make sure we have enough credential bits so that we can make security and selinux decisions */
r = sd_bus_negotiate_creds(bus, 1,
SD_BUS_CREDS_PID|SD_BUS_CREDS_UID|
SD_BUS_CREDS_EUID|SD_BUS_CREDS_EFFECTIVE_CAPS|
SD_BUS_CREDS_SELINUX_CONTEXT);
if (r < 0)
log_warning_errno(r, "Failed to enable credential passing, ignoring: %m");
r = bus_setup_api_vtables(m, bus);
if (r < 0)
return r;
HASHMAP_FOREACH_KEY(u, name, m->watch_bus, i) {
r = unit_install_bus_match(u, bus, name);
if (r < 0)
log_error_errno(r, "Failed to subscribe to NameOwnerChanged signal for '%s': %m", name);
}
r = sd_bus_add_match(
bus,
NULL,
"type='signal',"
"sender='org.freedesktop.DBus',"
"path='/org/freedesktop/DBus',"
"interface='org.freedesktop.systemd1.Activator',"
"member='ActivationRequest'",
signal_activation_request, m);
if (r < 0)
log_warning_errno(r, "Failed to subscribe to activation signal: %m");
/* Allow replacing of our name, to ease implementation of
* reexecution, where we keep the old connection open until
* after the new connection is set up and the name installed
* to allow clients to synchronously wait for reexecution to
* finish */
r = sd_bus_request_name(bus,"org.freedesktop.systemd1", SD_BUS_NAME_REPLACE_EXISTING|SD_BUS_NAME_ALLOW_REPLACEMENT);
if (r < 0)
return log_error_errno(r, "Failed to register name: %m");
r = manager_sync_bus_names(m, bus);
if (r < 0)
return r;
log_debug("Successfully connected to API bus.");
return 0;
}
static int bus_init_api(Manager *m) {
_cleanup_(sd_bus_unrefp) sd_bus *bus = NULL;
int r;
if (m->api_bus)
return 0;
/* The API and system bus is the same if we are running in system mode */
if (MANAGER_IS_SYSTEM(m) && m->system_bus)
bus = sd_bus_ref(m->system_bus);
else {
if (MANAGER_IS_SYSTEM(m))
r = sd_bus_open_system(&bus);
else
r = sd_bus_open_user(&bus);
if (r < 0) {
log_debug("Failed to connect to API bus, retrying later...");
return 0;
}
r = sd_bus_attach_event(bus, m->event, SD_EVENT_PRIORITY_NORMAL);
if (r < 0) {
log_error_errno(r, "Failed to attach API bus to event loop: %m");
return 0;
}
r = bus_setup_disconnected_match(m, bus);
if (r < 0)
return 0;
}
r = bus_setup_api(m, bus);
if (r < 0) {
log_error_errno(r, "Failed to set up API bus: %m");
return 0;
}
m->api_bus = bus;
bus = NULL;
return 0;
}
static int bus_setup_system(Manager *m, sd_bus *bus) {
int r;
assert(m);
assert(bus);
/* if we are a user instance we get the Released message via the system bus */
if (MANAGER_IS_USER(m)) {
r = sd_bus_add_match(
bus,
NULL,
"type='signal',"
"interface='org.freedesktop.systemd1.Agent',"
"member='Released',"
"path='/org/freedesktop/systemd1/agent'",
signal_agent_released, m);
if (r < 0)
log_warning_errno(r, "Failed to register Released match on system bus: %m");
}
log_debug("Successfully connected to system bus.");
return 0;
}
static int bus_init_system(Manager *m) {
_cleanup_(sd_bus_unrefp) sd_bus *bus = NULL;
int r;
if (m->system_bus)
return 0;
/* The API and system bus is the same if we are running in system mode */
if (MANAGER_IS_SYSTEM(m) && m->api_bus) {
m->system_bus = sd_bus_ref(m->api_bus);
return 0;
}
r = sd_bus_open_system(&bus);
if (r < 0) {
log_debug("Failed to connect to system bus, retrying later...");
return 0;
}
r = bus_setup_disconnected_match(m, bus);
if (r < 0)
return 0;
r = sd_bus_attach_event(bus, m->event, SD_EVENT_PRIORITY_NORMAL);
if (r < 0) {
log_error_errno(r, "Failed to attach system bus to event loop: %m");
return 0;
}
r = bus_setup_system(m, bus);
if (r < 0) {
log_error_errno(r, "Failed to set up system bus: %m");
return 0;
}
m->system_bus = bus;
bus = NULL;
return 0;
}
static int bus_init_private(Manager *m) {
_cleanup_close_ int fd = -1;
union sockaddr_union sa = {
.un.sun_family = AF_UNIX
};
sd_event_source *s;
socklen_t salen;
int r;
assert(m);
if (m->private_listen_fd >= 0)
return 0;
/* We don't need the private socket if we have kdbus */
if (m->kdbus_fd >= 0)
return 0;
if (MANAGER_IS_SYSTEM(m)) {
/* We want the private bus only when running as init */
if (getpid() != 1)
return 0;
strcpy(sa.un.sun_path, "/run/systemd/private");
salen = SOCKADDR_UN_LEN(sa.un);
} else {
size_t left = sizeof(sa.un.sun_path);
char *p = sa.un.sun_path;
const char *e;
e = secure_getenv("XDG_RUNTIME_DIR");
if (!e) {
log_error("Failed to determine XDG_RUNTIME_DIR");
return -EHOSTDOWN;
}
left = strpcpy(&p, left, e);
left = strpcpy(&p, left, "/systemd/private");
salen = sizeof(sa.un) - left;
}
(void) mkdir_parents_label(sa.un.sun_path, 0755);
(void) unlink(sa.un.sun_path);
fd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
if (fd < 0)
return log_error_errno(errno, "Failed to allocate private socket: %m");
r = bind(fd, &sa.sa, salen);
if (r < 0)
return log_error_errno(errno, "Failed to bind private socket: %m");
r = listen(fd, SOMAXCONN);
if (r < 0)
return log_error_errno(errno, "Failed to make private socket listening: %m");
r = sd_event_add_io(m->event, &s, fd, EPOLLIN, bus_on_connection, m);
if (r < 0)
return log_error_errno(r, "Failed to allocate event source: %m");
(void) sd_event_source_set_description(s, "bus-connection");
m->private_listen_fd = fd;
m->private_listen_event_source = s;
fd = -1;
log_debug("Successfully created private D-Bus server.");
return 0;
}
int bus_init(Manager *m, bool try_bus_connect) {
int r;
if (try_bus_connect) {
r = bus_init_system(m);
if (r < 0)
return r;
r = bus_init_api(m);
if (r < 0)
return r;
}
r = bus_init_private(m);
if (r < 0)
return r;
return 0;
}
static void destroy_bus(Manager *m, sd_bus **bus) {
Iterator i;
Job *j;
assert(m);
assert(bus);
if (!*bus)
return;
/* Get rid of tracked clients on this bus */
if (m->subscribed && sd_bus_track_get_bus(m->subscribed) == *bus)
m->subscribed = sd_bus_track_unref(m->subscribed);
HASHMAP_FOREACH(j, m->jobs, i)
if (j->clients && sd_bus_track_get_bus(j->clients) == *bus)
j->clients = sd_bus_track_unref(j->clients);
/* Get rid of queued message on this bus */
if (m->queued_message && sd_bus_message_get_bus(m->queued_message) == *bus)
m->queued_message = sd_bus_message_unref(m->queued_message);
/* Possibly flush unwritten data, but only if we are
* unprivileged, since we don't want to sync here */
if (!MANAGER_IS_SYSTEM(m))
sd_bus_flush(*bus);
/* And destroy the object */
sd_bus_close(*bus);
*bus = sd_bus_unref(*bus);
}
void bus_done(Manager *m) {
sd_bus *b;
assert(m);
if (m->api_bus)
destroy_bus(m, &m->api_bus);
if (m->system_bus)
destroy_bus(m, &m->system_bus);
while ((b = set_steal_first(m->private_buses)))
destroy_bus(m, &b);
m->private_buses = set_free(m->private_buses);
m->subscribed = sd_bus_track_unref(m->subscribed);
m->deserialized_subscribed = strv_free(m->deserialized_subscribed);
if (m->private_listen_event_source)
m->private_listen_event_source = sd_event_source_unref(m->private_listen_event_source);
m->private_listen_fd = safe_close(m->private_listen_fd);
bus_verify_polkit_async_registry_free(m->polkit_registry);
}
int bus_fdset_add_all(Manager *m, FDSet *fds) {
Iterator i;
sd_bus *b;
int fd;
assert(m);
assert(fds);
/* When we are about to reexecute we add all D-Bus fds to the
* set to pass over to the newly executed systemd. They won't
* be used there however, except thatt they are closed at the
* very end of deserialization, those making it possible for
* clients to synchronously wait for systemd to reexec by
* simply waiting for disconnection */
if (m->api_bus) {
fd = sd_bus_get_fd(m->api_bus);
if (fd >= 0) {
fd = fdset_put_dup(fds, fd);
if (fd < 0)
return fd;
}
}
SET_FOREACH(b, m->private_buses, i) {
fd = sd_bus_get_fd(b);
if (fd >= 0) {
fd = fdset_put_dup(fds, fd);
if (fd < 0)
return fd;
}
}
/* We don't offer any APIs on the system bus (well, unless it
* is the same as the API bus) hence we don't bother with it
* here */
return 0;
}
int bus_foreach_bus(
Manager *m,
sd_bus_track *subscribed2,
int (*send_message)(sd_bus *bus, void *userdata),
void *userdata) {
Iterator i;
sd_bus *b;
int r, ret = 0;
/* Send to all direct buses, unconditionally */
SET_FOREACH(b, m->private_buses, i) {
r = send_message(b, userdata);
if (r < 0)
ret = r;
}
/* Send to API bus, but only if somebody is subscribed */
if (sd_bus_track_count(m->subscribed) > 0 ||
sd_bus_track_count(subscribed2) > 0) {
r = send_message(m->api_bus, userdata);
if (r < 0)
ret = r;
}
return ret;
}
void bus_track_serialize(sd_bus_track *t, FILE *f) {
const char *n;
assert(f);
for (n = sd_bus_track_first(t); n; n = sd_bus_track_next(t))
fprintf(f, "subscribed=%s\n", n);
}
int bus_track_deserialize_item(char ***l, const char *line) {
const char *e;
int r;
assert(l);
assert(line);
e = startswith(line, "subscribed=");
if (!e)
return 0;
r = strv_extend(l, e);
if (r < 0)
return r;
return 1;
}
int bus_track_coldplug(Manager *m, sd_bus_track **t, char ***l) {
int r = 0;
assert(m);
assert(t);
assert(l);
if (!strv_isempty(*l) && m->api_bus) {
char **i;
if (!*t) {
r = sd_bus_track_new(m->api_bus, t, NULL, NULL);
if (r < 0)
return r;
}
r = 0;
STRV_FOREACH(i, *l) {
int k;
k = sd_bus_track_add_name(*t, *i);
if (k < 0)
r = k;
}
}
*l = strv_free(*l);
return r;
}
int bus_verify_manage_units_async(Manager *m, sd_bus_message *call, sd_bus_error *error) {
return bus_verify_polkit_async(call, CAP_SYS_ADMIN, "org.freedesktop.systemd1.manage-units", NULL, false, UID_INVALID, &m->polkit_registry, error);
}
int bus_verify_manage_unit_files_async(Manager *m, sd_bus_message *call, sd_bus_error *error) {
return bus_verify_polkit_async(call, CAP_SYS_ADMIN, "org.freedesktop.systemd1.manage-unit-files", NULL, false, UID_INVALID, &m->polkit_registry, error);
}
int bus_verify_reload_daemon_async(Manager *m, sd_bus_message *call, sd_bus_error *error) {
return bus_verify_polkit_async(call, CAP_SYS_ADMIN, "org.freedesktop.systemd1.reload-daemon", NULL, false, UID_INVALID, &m->polkit_registry, error);
}
int bus_verify_set_environment_async(Manager *m, sd_bus_message *call, sd_bus_error *error) {
return bus_verify_polkit_async(call, CAP_SYS_ADMIN, "org.freedesktop.systemd1.set-environment", NULL, false, UID_INVALID, &m->polkit_registry, error);
}
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