/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ /*** 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; } static int signal_agent_released(sd_bus_message *message, void *userdata, sd_bus_error *error) { _cleanup_bus_creds_unref_ sd_bus_creds *creds = NULL; const char *cgroup, *me; Manager *m = userdata; uid_t sender_uid; sd_bus *bus; int r; assert(message); assert(m); /* ignore recursive events sent by us on the system/user bus */ bus = sd_bus_message_get_bus(message); if (!sd_bus_is_server(bus)) { r = sd_bus_get_unique_name(bus, &me); if (r < 0) return r; if (streq_ptr(sd_bus_message_get_sender(message), me)) return 0; } /* 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); /* if running as system-instance, forward under our name */ if (m->running_as == MANAGER_SYSTEM && m->system_bus) { r = sd_bus_message_rewind(message, 1); if (r >= 0) r = sd_bus_send(m->system_bus, message, NULL); if (r < 0) log_warning_errno(r, "Failed to forward Released message: %m"); } 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_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; _cleanup_bus_message_unref_ 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_bus_creds_unref_ 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_bus_creds_unref_ 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_bus_unref_ 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; } if (m->running_as == MANAGER_SYSTEM) { /* When we run as system instance we get the Released * signal via a direct connection */ 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 new connection bus: %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; } static int bus_list_names(Manager *m, sd_bus *bus) { _cleanup_strv_free_ char **names = NULL; char **i; 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"); /* This is a bit hacky, we say the owner of the name is the * name itself, because we don't want the extra traffic to * figure out the real owner. */ STRV_FOREACH(i, names) { Unit *u; u = hashmap_get(m->watch_bus, *i); if (u) UNIT_VTABLE(u)->bus_name_owner_change(u, *i, NULL, *i); } 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"); bus_list_names(m, bus); log_debug("Successfully connected to API bus."); return 0; } static int bus_init_api(Manager *m) { _cleanup_bus_unref_ 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 (m->running_as == MANAGER_SYSTEM && m->system_bus) bus = sd_bus_ref(m->system_bus); else { if (m->running_as == MANAGER_SYSTEM) 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); /* On kdbus or if we are a user instance we get the Released message via the system bus */ if (m->running_as == MANAGER_USER || m->kdbus_fd >= 0) { 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_bus_unref_ 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 (m->running_as == MANAGER_SYSTEM && 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 (m->running_as == MANAGER_SYSTEM) { /* We want the private bus only when running as init */ if (getpid() != 1) return 0; strcpy(sa.un.sun_path, "/run/systemd/private"); salen = offsetof(union sockaddr_union, un.sun_path) + strlen("/run/systemd/private"); } 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 (m->running_as != MANAGER_SYSTEM) 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); }