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systemd/src/core/dbus.c
Ronan Pigott 11ee1bab60 dbus: log disconnect on api and system busses 
This is an interesting event. Let's log about it.
2024-12-11 12:12:14 -07:00

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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#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-label.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 "umask-util.h"
#include "user-util.h"
#define CONNECTIONS_MAX 4096
static void destroy_bus(Manager *m, sd_bus **bus);
void bus_send_pending_reload_message(Manager *m) {
int r;
assert(m);
if (!m->pending_reload_message)
return;
/* 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->pending_reload_message, NULL);
if (r < 0)
log_warning_errno(r, "Failed to send queued reload message, ignoring: %m");
m->pending_reload_message = sd_bus_message_unref(m->pending_reload_message);
return;
}
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_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 = ASSERT_PTR(userdata);
const char *cgroup;
uid_t sender_uid;
int r;
assert(message);
/* 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 = ASSERT_PTR(userdata);
sd_bus *bus;
assert(message);
assert_se(bus = sd_bus_message_get_bus(message));
if (bus == m->api_bus) {
log_notice("Got disconnect on API bus.");
bus_done_api(m);
}
if (bus == m->system_bus) {
/* If we are the system manager, this is already logged by the API bus. */
if (!MANAGER_IS_SYSTEM(m))
log_notice("Got disconnect on 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 = ASSERT_PTR(userdata);
const char *name;
Unit *u;
int r;
assert(message);
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_SOCKET) ||
manager_unit_inactive_or_pending(m, SPECIAL_DBUS_SERVICE)) {
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, &error, /* ret = */ 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
* 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 (!path)
return 0;
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(path, "/org/freedesktop/systemd1/unit/self")) {
_cleanup_(pidref_done) PidRef pidref = PIDREF_NULL;
r = bus_query_sender_pidref(message, &pidref);
if (r < 0)
return 0;
u = manager_get_unit_by_pidref(m, &pidref);
} else {
r = manager_get_job_from_dbus_path(m, path, &j);
if (r >= 0)
u = j->unit;
else
(void) 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 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(path, "/org/freedesktop/systemd1/unit/self")) {
_cleanup_(pidref_done) PidRef pidref = PIDREF_NULL;
sd_bus_message *message;
message = sd_bus_get_current_message(bus);
if (!message)
return 0;
r = bus_query_sender_pidref(message, &pidref);
if (r < 0)
return r;
u = manager_get_unit_by_pidref(m, &pidref);
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 = ASSERT_PTR(userdata);
assert(bus);
assert(path);
assert(interface);
assert(found);
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 = ASSERT_PTR(userdata);
Unit *u;
int r;
assert(bus);
assert(path);
assert(interface);
assert(found);
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 = ASSERT_PTR(userdata);
Unit *u;
int r;
assert(bus);
assert(path);
assert(interface);
assert(found);
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 = ASSERT_PTR(userdata);
CGroupContext *c;
Unit *u;
int r;
assert(bus);
assert(path);
assert(interface);
assert(found);
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 = ASSERT_PTR(userdata);
ExecContext *c;
Unit *u;
int r;
assert(bus);
assert(path);
assert(interface);
assert(found);
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 = ASSERT_PTR(userdata);
KillContext *c;
Unit *u;
int r;
assert(bus);
assert(path);
assert(interface);
assert(found);
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");
#endif
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 = -EBADF;
Manager *m = ASSERT_PTR(userdata);
sd_id128_t id;
int r;
assert(s);
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;
}
TAKE_FD(nfd);
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|
SD_BUS_CREDS_COMM|SD_BUS_CREDS_DESCRIPTION);
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;
}
if (DEBUG_LOGGING) {
_cleanup_(sd_bus_creds_unrefp) sd_bus_creds *c = NULL;
const char *comm = NULL, *description = NULL;
pid_t pid = 0;
r = sd_bus_get_owner_creds(bus, SD_BUS_CREDS_PID|SD_BUS_CREDS_COMM|SD_BUS_CREDS_DESCRIPTION, &c);
if (r < 0)
log_warning_errno(r, "Failed to get peer creds, ignoring: %m");
else {
(void) sd_bus_creds_get_pid(c, &pid);
(void) sd_bus_creds_get_comm(c, &comm);
(void) sd_bus_creds_get_description(c, &description);
}
log_debug("Accepting direct incoming connection from " PID_FMT " (%s) [%s]", pid, strna(comm), strna(description));
}
r = sd_bus_attach_event(bus, m->event, EVENT_PRIORITY_IPC);
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 = bus_register_malloc_status(bus, "org.freedesktop.systemd1");
if (r < 0)
log_warning_errno(r, "Failed to register MemoryAllocation1, ignoring: %m");
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
* 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_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");
r = bus_register_malloc_status(bus, "org.freedesktop.systemd1");
if (r < 0)
log_warning_errno(r, "Failed to register MemoryAllocation1, ignoring: %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;
assert(m);
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, EVENT_PRIORITY_IPC);
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 void 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;
}
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, EVENT_PRIORITY_IPC);
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;
}
bus_setup_system(m, bus);
m->system_bus = TAKE_PTR(bus);
return 0;
}
int bus_init_private(Manager *m) {
_cleanup_close_ int fd = -EBADF;
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 {
_cleanup_free_ char *p = NULL;
p = path_join(m->prefix[EXEC_DIRECTORY_RUNTIME], "systemd/private");
if (!p)
return log_oom();
r = sockaddr_un_set_path(&sa.un, p);
}
if (r < 0)
return log_error_errno(r, "Failed set socket path for private bus: %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");
WITH_UMASK(0077)
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_DELUXE);
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) {
if (u->bus_track && sd_bus_track_get_bus(u->bus_track) == *bus)
u->bus_track = sd_bus_track_unref(u->bus_track);
/* Get rid of pending freezer messages on this bus */
if (u->pending_freezer_invocation && sd_bus_message_get_bus(u->pending_freezer_invocation) == *bus)
u->pending_freezer_invocation = sd_bus_message_unref(u->pending_freezer_invocation);
}
/* Get rid of queued message on this bus */
if (m->pending_reload_message && sd_bus_message_get_bus(m->pending_reload_message) == *bus)
m->pending_reload_message = sd_bus_message_unref(m->pending_reload_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 */
*bus = sd_bus_close_unref(*bus);
}
void bus_done_api(Manager *m) {
destroy_bus(m, &m->api_bus);
}
void bus_done_system(Manager *m) {
destroy_bus(m, &m->system_bus);
}
void bus_done_private(Manager *m) {
sd_bus *b;
assert(m);
while ((b = set_steal_first(m->private_buses)))
destroy_bus(m, &b);
m->private_buses = set_free(m->private_buses);
m->private_listen_event_source = sd_event_source_disable_unref(m->private_listen_event_source);
m->private_listen_fd = safe_close(m->private_listen_fd);
}
void bus_done(Manager *m) {
assert(m);
bus_done_api(m);
bus_done_system(m);
bus_done_private(m);
assert(!m->subscribed);
m->deserialized_subscribed = strv_free(m->deserialized_subscribed);
m->polkit_registry = hashmap_free(m->polkit_registry);
}
int bus_fdset_add_all(Manager *m, FDSet *fds) {
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) {
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) {
int r = 0;
assert(m);
assert(send_message);
/* Send to all direct buses, unconditionally */
sd_bus *b;
SET_FOREACH(b, m->private_buses) {
/* Don't bother with enqueuing these messages to clients that haven't started yet */
if (sd_bus_is_ready(b) <= 0)
continue;
RET_GATHER(r, send_message(b, userdata));
}
/* Send to API bus, but only if somebody is subscribed */
if (m->api_bus &&
(sd_bus_track_count(m->subscribed) > 0 ||
sd_bus_track_count(subscribed2) > 0))
RET_GATHER(r, send_message(m->api_bus, userdata));
return r;
}
void bus_track_serialize(sd_bus_track *t, FILE *f, const char *prefix) {
const char *n;
assert(f);
assert(prefix);
for (n = sd_bus_track_first(t); n; n = sd_bus_track_next(t)) {
int c, j;
c = sd_bus_track_count_name(t, n);
for (j = 0; j < c; j++)
(void) serialize_item(f, prefix, n);
}
}
int bus_track_coldplug(Manager *m, sd_bus_track **t, bool recursive, char **l) {
int r;
assert(m);
assert(t);
if (strv_isempty(l))
return 0;
if (!m->api_bus)
return 0;
if (!*t) {
r = sd_bus_track_new(m->api_bus, t, NULL, NULL);
if (r < 0)
return r;
}
r = sd_bus_track_set_recursive(*t, recursive);
if (r < 0)
return r;
return bus_track_add_name_many(*t, l);
}
uint64_t manager_bus_n_queued_write(Manager *m) {
uint64_t c = 0;
sd_bus *b;
int r;
/* Returns the total number of messages queued for writing on all our direct and API buses. */
SET_FOREACH(b, m->private_buses) {
uint64_t k;
r = sd_bus_get_n_queued_write(b, &k);
if (r < 0)
log_debug_errno(r, "Failed to query queued messages for private bus: %m");
else
c += k;
}
if (m->api_bus) {
uint64_t k;
r = sd_bus_get_n_queued_write(m->api_bus, &k);
if (r < 0)
log_debug_errno(r, "Failed to query queued messages for API bus: %m");
else
c += k;
}
return c;
}
static void vtable_dump_bus_properties(FILE *f, const sd_bus_vtable *table) {
const sd_bus_vtable *i;
for (i = table; i->type != _SD_BUS_VTABLE_END; i++) {
if (!IN_SET(i->type, _SD_BUS_VTABLE_PROPERTY, _SD_BUS_VTABLE_WRITABLE_PROPERTY) ||
(i->flags & (SD_BUS_VTABLE_DEPRECATED | SD_BUS_VTABLE_HIDDEN)) != 0)
continue;
fprintf(f, "%s\n", i->x.property.member);
}
}
void dump_bus_properties(FILE *f) {
assert(f);
vtable_dump_bus_properties(f, bus_automount_vtable);
vtable_dump_bus_properties(f, bus_cgroup_vtable);
vtable_dump_bus_properties(f, bus_device_vtable);
vtable_dump_bus_properties(f, bus_exec_vtable);
vtable_dump_bus_properties(f, bus_job_vtable);
vtable_dump_bus_properties(f, bus_kill_vtable);
vtable_dump_bus_properties(f, bus_manager_vtable);
vtable_dump_bus_properties(f, bus_mount_vtable);
vtable_dump_bus_properties(f, bus_path_vtable);
vtable_dump_bus_properties(f, bus_scope_vtable);
vtable_dump_bus_properties(f, bus_service_vtable);
vtable_dump_bus_properties(f, bus_slice_vtable);
vtable_dump_bus_properties(f, bus_socket_vtable);
vtable_dump_bus_properties(f, bus_swap_vtable);
vtable_dump_bus_properties(f, bus_target_vtable);
vtable_dump_bus_properties(f, bus_timer_vtable);
vtable_dump_bus_properties(f, bus_unit_vtable);
vtable_dump_bus_properties(f, bus_unit_cgroup_vtable);
}
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