#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-polkit.h"

#include "bus-util.h"

#include "dbus-automount.h"

#include "dbus-cgroup.h"

#include "dbus-device.h"

#include "dbus-execute.h"

#include "dbus-job.h"

#include "dbus-kill.h"

#include "dbus-manager.h"

#include "dbus-mount.h"

#include "dbus-path.h"

#include "dbus-scope.h"

#include "dbus-service.h"

#include "dbus-slice.h"

#include "dbus-socket.h"

#include "dbus-swap.h"

#include "dbus-target.h"

#include "dbus-timer.h"

#include "dbus-unit.h"

#include "dbus.h"

#include "fd-util.h"

#include "fs-util.h"

#include "log.h"

#include "mkdir.h"

#include "process-util.h"

#include "selinux-access.h"

#include "serialize.h"

#include "service.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_pending_reload_message(Manager *m) {

int r;

assert(m);

if (!m->pending_reload_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

r = sd_bus_send(NULL, m->pending_reload_message, NULL);

if (r < 0)

log_warning_errno(r, "Failed to send queued message, ignoring: %m");

m->pending_reload_message = sd_bus_message_unref(m->pending_reload_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

r = sd_bus_emit_signal(m->system_bus,

"/org/freedesktop/systemd1/agent",

"org.freedesktop.systemd1.Agent",

"Released",

"s", path);

if (r < 0)

return log_debug_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)

bus_done_api(m);

if (bus == m->system_bus)

bus_done_system(m);

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_set(&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 (it is configured to refuse manual start/stop).", u->id);

goto failed;

}

r = manager_add_job(m, JOB_START, u, JOB_REPLACE, NULL, &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;

}

#if 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

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;

}

static int find_unit(Manager *m, sd_bus *bus, const char *path, Unit **unit, sd_bus_error *error) {

Unit *u = NULL; /* just to appease gcc, initialization is not really necessary */

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);

if (!u)

return 0;

} else {

r = manager_load_unit_from_dbus_path(m, path, error, &u);

if (r < 0)

return 0;

assert(u);

}

*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_unit_enumerate(sd_bus *bus, const char *path, void *userdata, char ***nodes, sd_bus_error *error) {

_cleanup_strv_free_ char **l = NULL;

Manager *m = userdata;

unsigned k = 0;

Unit *u;

l = new0(char*, hashmap_size(m->units)+1);

if (!l)

return -ENOMEM;

HASHMAP_FOREACH(u, m->units) {

l[k] = unit_dbus_path(u);

if (!l[k])

return -ENOMEM;

k++;

}

*nodes = TAKE_PTR(l);

return k;

}

static const BusObjectImplementation unit_object = {

"/org/freedesktop/systemd1/unit",

"org.freedesktop.systemd1.Unit",

.fallback_vtables = BUS_FALLBACK_VTABLES(

{ bus_unit_vtable, bus_unit_find }),

.node_enumerator = bus_unit_enumerate,

};

static const BusObjectImplementation bus_automount_object = {

"/org/freedesktop/systemd1/unit",

"org.freedesktop.systemd1.Automount",

.fallback_vtables = BUS_FALLBACK_VTABLES(

{ bus_automount_vtable, bus_unit_interface_find }),

};

static const BusObjectImplementation bus_device_object = {

"/org/freedesktop/systemd1/unit",

"org.freedesktop.systemd1.Device",

.fallback_vtables = BUS_FALLBACK_VTABLES(

{ bus_device_vtable, bus_unit_interface_find }),

};

static const BusObjectImplementation bus_mount_object = {

"/org/freedesktop/systemd1/unit",

"org.freedesktop.systemd1.Mount",

.fallback_vtables = BUS_FALLBACK_VTABLES(

{ bus_mount_vtable, bus_unit_interface_find },

{ bus_unit_cgroup_vtable, bus_unit_cgroup_find },

{ bus_cgroup_vtable, bus_cgroup_context_find },

{ bus_exec_vtable, bus_exec_context_find },

{ bus_kill_vtable, bus_kill_context_find }),

};

static const BusObjectImplementation bus_path_object = {

"/org/freedesktop/systemd1/unit",

"org.freedesktop.systemd1.Path",

.fallback_vtables = BUS_FALLBACK_VTABLES(

{ bus_path_vtable, bus_unit_interface_find }),

};

static const BusObjectImplementation bus_scope_object = {

"/org/freedesktop/systemd1/unit",

"org.freedesktop.systemd1.Scope",

.fallback_vtables = BUS_FALLBACK_VTABLES(

{ bus_scope_vtable, bus_unit_interface_find },

{ bus_unit_cgroup_vtable, bus_unit_cgroup_find },

{ bus_cgroup_vtable, bus_cgroup_context_find },

{ bus_kill_vtable, bus_kill_context_find }),

};

static const BusObjectImplementation bus_service_object = {

"/org/freedesktop/systemd1/unit",

"org.freedesktop.systemd1.Service",

.fallback_vtables = BUS_FALLBACK_VTABLES(

{ bus_service_vtable, bus_unit_interface_find },

{ bus_unit_cgroup_vtable, bus_unit_cgroup_find },

{ bus_cgroup_vtable, bus_cgroup_context_find },

{ bus_exec_vtable, bus_exec_context_find },

{ bus_kill_vtable, bus_kill_context_find }),

};

static const BusObjectImplementation bus_slice_object = {

"/org/freedesktop/systemd1/unit",

"org.freedesktop.systemd1.Slice",

.fallback_vtables = BUS_FALLBACK_VTABLES(

{ bus_slice_vtable, bus_unit_interface_find },

{ bus_unit_cgroup_vtable, bus_unit_cgroup_find },

{ bus_cgroup_vtable, bus_cgroup_context_find }),

};

static const BusObjectImplementation bus_socket_object = {

"/org/freedesktop/systemd1/unit",

"org.freedesktop.systemd1.Socket",

.fallback_vtables = BUS_FALLBACK_VTABLES(

{ bus_socket_vtable, bus_unit_interface_find },

{ bus_unit_cgroup_vtable, bus_unit_cgroup_find },

{ bus_cgroup_vtable, bus_cgroup_context_find },

{ bus_exec_vtable, bus_exec_context_find },

{ bus_kill_vtable, bus_kill_context_find }),

};

static const BusObjectImplementation bus_swap_object = {

"/org/freedesktop/systemd1/unit",

"org.freedesktop.systemd1.Swap",

.fallback_vtables = BUS_FALLBACK_VTABLES(

{ bus_swap_vtable, bus_unit_interface_find },

{ bus_unit_cgroup_vtable, bus_unit_cgroup_find },

{ bus_cgroup_vtable, bus_cgroup_context_find },

{ bus_exec_vtable, bus_exec_context_find },

{ bus_kill_vtable, bus_kill_context_find }),

};

static const BusObjectImplementation bus_target_object = {

"/org/freedesktop/systemd1/unit",

"org.freedesktop.systemd1.Target",

.fallback_vtables = BUS_FALLBACK_VTABLES(

{ bus_target_vtable, bus_unit_interface_find }),

};

static const BusObjectImplementation bus_timer_object = {

"/org/freedesktop/systemd1/unit",

"org.freedesktop.systemd1.Timer",

.fallback_vtables = BUS_FALLBACK_VTABLES(

{ bus_timer_vtable, bus_unit_interface_find }),

};

static const BusObjectImplementation bus_manager_object = {

"/org/freedesktop/systemd1",

"org.freedesktop.systemd1.Manager",

.vtables = BUS_VTABLES(bus_manager_vtable),

.children = BUS_IMPLEMENTATIONS(

&job_object,

&unit_object,

&bus_automount_object,

&bus_device_object,

&bus_mount_object,

&bus_path_object,

&bus_scope_object,

&bus_service_object,

&bus_slice_object,

&bus_socket_object,

&bus_swap_object,

&bus_target_object,

&bus_timer_object),

};

static const BusObjectImplementation manager_log_control_object = {

"/org/freedesktop/LogControl1",

"org.freedesktop.LogControl1",

.vtables = BUS_VTABLES(bus_manager_log_control_vtable),

};

int bus_manager_introspect_implementations(FILE *out, const char *pattern) {

return bus_introspect_implementations(

out,

pattern,

BUS_IMPLEMENTATIONS(&bus_manager_object,

&manager_log_control_object));

}

static int bus_setup_api_vtables(Manager *m, sd_bus *bus) {

int r;

assert(m);

assert(bus);

#if 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");

r = bus_add_implementation(bus, &bus_manager_object, m);

if (r < 0)

return r;

return bus_add_implementation(bus, &manager_log_control_object, m);

}

static int bus_setup_disconnected_match(Manager *m, sd_bus *bus) {

int r;

assert(m);

assert(bus);

r = sd_bus_match_signal_async(

bus,

NULL,

"org.freedesktop.DBus.Local",

"/org/freedesktop/DBus/Local",

"org.freedesktop.DBus.Local",

"Disconnected",

signal_disconnected, NULL, m);

if (r < 0)

return log_error_errno(r, "Failed to request 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_close_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) {

if (ERRNO_IS_ACCEPT_AGAIN(errno))

return 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 = sd_bus_new(&bus);

if (r < 0) {

log_warning_errno(r, "Failed to allocate new private connection bus: %m");

return 0;

}

(void) sd_bus_set_description(bus, "private-bus-connection");

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_set_sender(bus, "org.freedesktop.systemd1");

if (r < 0) {

log_warning_errno(r, "Failed to set direct connection sender: %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_ensure_put(&m->private_buses, NULL, bus);

if (r == -ENOMEM) {

log_oom();

return 0;

}

if (r < 0) {

log_warning_errno(r, "Failed to add new connection bus to set: %m");

return 0;

}

TAKE_PTR(bus);

log_debug("Accepted new private connection.");

return 0;

}

static int bus_setup_api(Manager *m, sd_bus *bus) {

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) {

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_match_signal_async(

bus,

NULL,

"org.freedesktop.DBus",

"/org/freedesktop/DBus",

"org.freedesktop.systemd1.Activator",

"ActivationRequest",

signal_activation_request, NULL, 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

r = sd_bus_request_name_async(bus, NULL, "org.freedesktop.systemd1", SD_BUS_NAME_REPLACE_EXISTING|SD_BUS_NAME_ALLOW_REPLACEMENT, NULL, NULL);

if (r < 0)

return log_error_errno(r, "Failed to request name: %m");

log_debug("Successfully connected to API bus.");

return 0;

}

int bus_init_api(Manager *m) {

_cleanup_(sd_bus_close_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_with_description(&bus, "bus-api-system");

else

r = sd_bus_open_user_with_description(&bus, "bus-api-user");

if (r < 0)

return log_error_errno(r, "Failed to connect to API bus: %m");

r = sd_bus_attach_event(bus, m->event, SD_EVENT_PRIORITY_NORMAL);

if (r < 0)

return log_error_errno(r, "Failed to attach API bus to event loop: %m");

r = bus_setup_disconnected_match(m, bus);

if (r < 0)

return r;

}

r = bus_setup_api(m, bus);

if (r < 0)

return log_error_errno(r, "Failed to set up API bus: %m");

m->api_bus = TAKE_PTR(bus);

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_match_signal_async(

bus,

NULL,

NULL,

"/org/freedesktop/systemd1/agent",

"org.freedesktop.systemd1.Agent",

"Released",

signal_agent_released, NULL, m);

if (r < 0)

log_warning_errno(r, "Failed to request Released match on system bus: %m");

}

log_debug("Successfully connected to system bus.");

return 0;

}

int bus_init_system(Manager *m) {

_cleanup_(sd_bus_close_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)

bus = sd_bus_ref(m->api_bus);

else {

r = sd_bus_open_system_with_description(&bus, "bus-system");

if (r < 0)

return log_error_errno(r, "Failed to connect to system bus: %m");

r = sd_bus_attach_event(bus, m->event, SD_EVENT_PRIORITY_NORMAL);

if (r < 0)

return log_error_errno(r, "Failed to attach system bus to event loop: %m");

r = bus_setup_disconnected_match(m, bus);

if (r < 0)

return r;

}

r = bus_setup_system(m, bus);

if (r < 0)

return log_error_errno(r, "Failed to set up system bus: %m");

m->system_bus = TAKE_PTR(bus);

return 0;

}

int bus_init_private(Manager *m) {

_cleanup_close_ int fd = -1;

union sockaddr_union sa;

socklen_t sa_len;

sd_event_source *s;

int r;

assert(m);

if (m->private_listen_fd >= 0)

return 0;

if (MANAGER_IS_SYSTEM(m)) {

/* We want the private bus only when running as init */

if (getpid_cached() != 1)

return 0;

r = sockaddr_un_set_path(&sa.un, "/run/systemd/private");

} else {

const char *e, *joined;

e = secure_getenv("XDG_RUNTIME_DIR");

if (!e)

return log_error_errno(SYNTHETIC_ERRNO(EHOSTDOWN),

"XDG_RUNTIME_DIR is not set, refusing.");

joined = strjoina(e, "/systemd/private");

r = sockaddr_un_set_path(&sa.un, joined);

}

if (r < 0)

return log_error_errno(r, "Can't set path for AF_UNIX socket to bind to: %m");

sa_len = r;

(void) mkdir_parents_label(sa.un.sun_path, 0755);

(void) sockaddr_un_unlink(&sa.un);

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, sa_len);

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");

/* Generate an inotify event in case somebody waits for this socket to appear using inotify() */

(void) touch(sa.un.sun_path);

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 = TAKE_FD(fd);

m->private_listen_event_source = s;

log_debug("Successfully created private D-Bus server.");

return 0;

}

static void destroy_bus(Manager *m, sd_bus **bus) {

Unit *u;

Job *j;

assert(m);

assert(bus);

if (!*bus)

return;

/* Make sure all bus slots watching names are released. */

HASHMAP_FOREACH(u, m->watch_bus) {

if (u->match_bus_slot && sd_bus_slot_get_bus(u->match_bus_slot) == *bus)

u->match_bus_slot = sd_bus_slot_unref(u->match_bus_slot);

if (u->get_name_owner_slot && sd_bus_slot_get_bus(u->get_name_owner_slot) == *bus)

u->get_name_owner_slot = sd_bus_slot_unref(u->get_name_owner_slot);

}

/* 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)

if (j->bus_track && sd_bus_track_get_bus(j->bus_track) == *bus)

j->bus_track = sd_bus_track_unref(j->bus_track);

HASHMAP_FOREACH(u, m->units) {