1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright 2010 Lennart Poettering
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU Lesser General Public License as published by
10 the Free Software Foundation; either version 2.1 of the License, or
11 (at your option) any later version.
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 Lesser General Public License for more details.
18 You should have received a copy of the GNU Lesser General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
22 #include <sys/epoll.h>
23 #include <sys/timerfd.h>
32 #include "dbus-unit.h"
34 #include "dbus-manager.h"
35 #include "dbus-execute.h"
36 #include "dbus-kill.h"
37 #include "dbus-cgroup.h"
41 #include "bus-error.h"
42 #include "bus-errors.h"
44 #include "dbus-client-track.h"
45 #include "bus-internal.h"
46 #include "selinux-access.h"
48 #define CONNECTIONS_MAX 512
50 static void destroy_bus(Manager *m, sd_bus **bus);
52 int bus_send_queued_message(Manager *m) {
57 if (!m->queued_message)
60 assert(m->queued_message_bus);
62 /* If we cannot get rid of this message we won't dispatch any
63 * D-Bus messages, so that we won't end up wanting to queue
66 r = sd_bus_send(m->queued_message_bus, m->queued_message, NULL);
68 log_warning("Failed to send queued message: %s", strerror(-r));
70 m->queued_message = sd_bus_message_unref(m->queued_message);
71 m->queued_message_bus = sd_bus_unref(m->queued_message_bus);
76 static int signal_agent_released(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
77 Manager *m = userdata;
85 r = sd_bus_message_read(message, "s", &cgroup);
87 bus_log_parse_error(r);
91 manager_notify_cgroup_empty(m, cgroup);
93 if (m->running_as == SYSTEMD_SYSTEM && m->system_bus) {
94 /* If we are running as system manager, forward the
95 * message to the system bus */
97 r = sd_bus_send(m->system_bus, message, NULL);
99 log_warning("Failed to forward Released message: %s", strerror(-r));
105 static int signal_disconnected(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
106 Manager *m = userdata;
112 if (bus == m->api_bus)
113 destroy_bus(m, &m->api_bus);
114 if (bus == m->system_bus)
115 destroy_bus(m, &m->system_bus);
116 if (set_remove(m->private_buses, bus)) {
117 log_debug("Got disconnect on private connection.");
118 destroy_bus(m, &bus);
124 static int signal_name_owner_changed(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
125 const char *name, *old_owner, *new_owner;
126 Manager *m = userdata;
133 r = sd_bus_message_read(message, "sss", &name, &old_owner, &new_owner);
135 bus_log_parse_error(r);
139 manager_dispatch_bus_name_owner_changed(
141 isempty(old_owner) ? NULL : old_owner,
142 isempty(new_owner) ? NULL : new_owner);
147 static int signal_activation_request(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *ret_error) {
148 _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
149 _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
150 Manager *m = userdata;
159 r = sd_bus_message_read(message, "s", &name);
161 bus_log_parse_error(r);
165 if (manager_unit_inactive_or_pending(m, SPECIAL_DBUS_SERVICE) ||
166 manager_unit_inactive_or_pending(m, SPECIAL_DBUS_SOCKET)) {
167 r = sd_bus_error_setf(&error, BUS_ERROR_SHUTTING_DOWN, "Refusing activation, D-Bus is shutting down.");
171 r = manager_load_unit(m, name, NULL, &error, &u);
175 if (u->refuse_manual_start) {
176 r = sd_bus_error_setf(&error, BUS_ERROR_ONLY_BY_DEPENDENCY, "Operation refused, %s may be requested by dependency only.", u->id);
180 r = manager_add_job(m, JOB_START, u, JOB_REPLACE, true, &error, NULL);
184 /* Successfully queued, that's it for us */
188 if (!sd_bus_error_is_set(&error))
189 sd_bus_error_set_errno(&error, r);
191 log_debug("D-Bus activation failed for %s: %s", name, bus_error_message(&error, r));
193 r = sd_bus_message_new_signal(bus, "/org/freedesktop/systemd1", "org.freedesktop.systemd1.Activator", "ActivationFailure", &reply);
195 bus_log_create_error(r);
199 r = sd_bus_message_append(reply, "sss", name, error.name, error.message);
201 bus_log_create_error(r);
205 r = sd_bus_send_to(bus, reply, "org.freedesktop.DBus", NULL);
207 log_error("Failed to respond with to bus activation request: %s", strerror(-r));
215 static int selinux_filter(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
216 Manager *m = userdata;
217 const char *verb, *path;
225 /* Our own method calls are all protected individually with
226 * selinux checks, but the built-in interfaces need to be
229 if (sd_bus_message_is_method_call(message, "org.freedesktop.DBus.Properties", "Set"))
231 else if (sd_bus_message_is_method_call(message, "org.freedesktop.DBus.Introspectable", NULL) ||
232 sd_bus_message_is_method_call(message, "org.freedesktop.DBus.Properties", NULL) ||
233 sd_bus_message_is_method_call(message, "org.freedesktop.DBus.ObjectManager", NULL) ||
234 sd_bus_message_is_method_call(message, "org.freedesktop.DBus.Peer", NULL))
239 path = sd_bus_message_get_path(message);
241 if (object_path_startswith("/org/freedesktop/systemd1", path)) {
243 r = selinux_access_check(bus, message, verb, error);
250 if (streq_ptr(path, "/org/freedesktop/systemd1/unit/self")) {
251 _cleanup_bus_creds_unref_ sd_bus_creds *creds = NULL;
254 r = sd_bus_query_sender_creds(message, SD_BUS_CREDS_PID, &creds);
258 r = sd_bus_creds_get_pid(creds, &pid);
262 u = manager_get_unit_by_pid(m, pid);
264 r = manager_get_job_from_dbus_path(m, path, &j);
268 manager_load_unit_from_dbus_path(m, path, NULL, &u);
274 r = selinux_unit_access_check(u, bus, message, verb, error);
282 static int bus_job_find(sd_bus *bus, const char *path, const char *interface, void *userdata, void **found, sd_bus_error *error) {
283 Manager *m = userdata;
293 r = manager_get_job_from_dbus_path(m, path, &j);
301 static int find_unit(Manager *m, sd_bus *bus, const char *path, Unit **unit, sd_bus_error *error) {
309 if (streq_ptr(path, "/org/freedesktop/systemd1/unit/self")) {
310 _cleanup_bus_creds_unref_ sd_bus_creds *creds = NULL;
311 sd_bus_message *message;
314 message = sd_bus_get_current(bus);
318 r = sd_bus_query_sender_creds(message, SD_BUS_CREDS_PID, &creds);
322 r = sd_bus_creds_get_pid(creds, &pid);
326 u = manager_get_unit_by_pid(m, pid);
328 r = manager_load_unit_from_dbus_path(m, path, error, &u);
340 static int bus_unit_find(sd_bus *bus, const char *path, const char *interface, void *userdata, void **found, sd_bus_error *error) {
341 Manager *m = userdata;
349 return find_unit(m, bus, path, (Unit**) found, error);
352 static int bus_unit_interface_find(sd_bus *bus, const char *path, const char *interface, void *userdata, void **found, sd_bus_error *error) {
353 Manager *m = userdata;
363 r = find_unit(m, bus, path, &u, error);
367 if (!streq_ptr(interface, UNIT_VTABLE(u)->bus_interface))
374 static int bus_unit_cgroup_find(sd_bus *bus, const char *path, const char *interface, void *userdata, void **found, sd_bus_error *error) {
375 Manager *m = userdata;
385 r = find_unit(m, bus, path, &u, error);
389 if (!streq_ptr(interface, UNIT_VTABLE(u)->bus_interface))
392 if (!unit_get_cgroup_context(u))
399 static int bus_cgroup_context_find(sd_bus *bus, const char *path, const char *interface, void *userdata, void **found, sd_bus_error *error) {
400 Manager *m = userdata;
411 r = find_unit(m, bus, path, &u, error);
415 if (!streq_ptr(interface, UNIT_VTABLE(u)->bus_interface))
418 c = unit_get_cgroup_context(u);
426 static int bus_exec_context_find(sd_bus *bus, const char *path, const char *interface, void *userdata, void **found, sd_bus_error *error) {
427 Manager *m = userdata;
438 r = find_unit(m, bus, path, &u, error);
442 if (!streq_ptr(interface, UNIT_VTABLE(u)->bus_interface))
445 c = unit_get_exec_context(u);
453 static int bus_kill_context_find(sd_bus *bus, const char *path, const char *interface, void *userdata, void **found, sd_bus_error *error) {
454 Manager *m = userdata;
465 r = find_unit(m, bus, path, &u, error);
469 if (!streq_ptr(interface, UNIT_VTABLE(u)->bus_interface))
472 c = unit_get_kill_context(u);
480 static int bus_job_enumerate(sd_bus *bus, const char *path, void *userdata, char ***nodes, sd_bus_error *error) {
481 _cleanup_free_ char **l = NULL;
482 Manager *m = userdata;
487 l = new0(char*, hashmap_size(m->jobs)+1);
491 HASHMAP_FOREACH(j, m->jobs, i) {
492 l[k] = job_dbus_path(j);
499 assert(hashmap_size(m->jobs) == k);
507 static int bus_unit_enumerate(sd_bus *bus, const char *path, void *userdata, char ***nodes, sd_bus_error *error) {
508 _cleanup_free_ char **l = NULL;
509 Manager *m = userdata;
514 l = new0(char*, hashmap_size(m->units)+1);
518 HASHMAP_FOREACH(u, m->units, i) {
519 l[k] = unit_dbus_path(u);
532 static int bus_setup_api_vtables(Manager *m, sd_bus *bus) {
540 r = sd_bus_add_filter(bus, selinux_filter, m);
542 log_error("Failed to add SELinux access filter: %s", strerror(-r));
547 r = sd_bus_add_object_vtable(bus, "/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager", bus_manager_vtable, m);
549 log_error("Failed to register Manager vtable: %s", strerror(-r));
553 r = sd_bus_add_fallback_vtable(bus, "/org/freedesktop/systemd1/job", "org.freedesktop.systemd1.Job", bus_job_vtable, bus_job_find, m);
555 log_error("Failed to register Job vtable: %s", strerror(-r));
559 r = sd_bus_add_node_enumerator(bus, "/org/freedesktop/systemd1/job", bus_job_enumerate, m);
561 log_error("Failed to add job enumerator: %s", strerror(-r));
565 r = sd_bus_add_fallback_vtable(bus, "/org/freedesktop/systemd1/unit", "org.freedesktop.systemd1.Unit", bus_unit_vtable, bus_unit_find, m);
567 log_error("Failed to register Unit vtable: %s", strerror(-r));
571 r = sd_bus_add_node_enumerator(bus, "/org/freedesktop/systemd1/unit", bus_unit_enumerate, m);
573 log_error("Failed to add job enumerator: %s", strerror(-r));
577 for (t = 0; t < _UNIT_TYPE_MAX; t++) {
578 r = sd_bus_add_fallback_vtable(bus, "/org/freedesktop/systemd1/unit", unit_vtable[t]->bus_interface, unit_vtable[t]->bus_vtable, bus_unit_interface_find, m);
580 log_error("Failed to register type specific vtable for %s: %s", unit_vtable[t]->bus_interface, strerror(-r));
584 if (unit_vtable[t]->cgroup_context_offset > 0) {
585 r = sd_bus_add_fallback_vtable(bus, "/org/freedesktop/systemd1/unit", unit_vtable[t]->bus_interface, bus_unit_cgroup_vtable, bus_unit_cgroup_find, m);
587 log_error("Failed to register control group unit vtable for %s: %s", unit_vtable[t]->bus_interface, strerror(-r));
591 r = sd_bus_add_fallback_vtable(bus, "/org/freedesktop/systemd1/unit", unit_vtable[t]->bus_interface, bus_cgroup_vtable, bus_cgroup_context_find, m);
593 log_error("Failed to register control group vtable for %s: %s", unit_vtable[t]->bus_interface, strerror(-r));
598 if (unit_vtable[t]->exec_context_offset > 0) {
599 r = sd_bus_add_fallback_vtable(bus, "/org/freedesktop/systemd1/unit", unit_vtable[t]->bus_interface, bus_exec_vtable, bus_exec_context_find, m);
601 log_error("Failed to register execute vtable for %s: %s", unit_vtable[t]->bus_interface, strerror(-r));
606 if (unit_vtable[t]->kill_context_offset > 0) {
607 r = sd_bus_add_fallback_vtable(bus, "/org/freedesktop/systemd1/unit", unit_vtable[t]->bus_interface, bus_kill_vtable, bus_kill_context_find, m);
609 log_error("Failed to register kill vtable for %s: %s", unit_vtable[t]->bus_interface, strerror(-r));
618 static int bus_setup_disconnected_match(Manager *m, sd_bus *bus) {
624 r = sd_bus_add_match(
626 "sender='org.freedesktop.DBus.Local',"
628 "path='/org/freedesktop/DBus/Local',"
629 "interface='org.freedesktop.DBus.Local',"
630 "member='Disconnected'",
631 signal_disconnected, m);
634 log_error("Failed to register match for Disconnected message: %s", strerror(-r));
641 static int bus_on_connection(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
642 _cleanup_bus_unref_ sd_bus *bus = NULL;
643 _cleanup_close_ int nfd = -1;
644 Manager *m = userdata;
651 nfd = accept4(fd, NULL, NULL, SOCK_NONBLOCK|SOCK_CLOEXEC);
653 log_warning("Failed to accept private connection, ignoring: %m");
657 if (set_size(m->private_buses) >= CONNECTIONS_MAX) {
658 log_warning("Too many concurrent connections, refusing");
662 r = set_ensure_allocated(&m->private_buses, trivial_hash_func, trivial_compare_func);
668 r = sd_bus_new(&bus);
670 log_warning("Failed to allocate new private connection bus: %s", strerror(-r));
674 r = sd_bus_set_fd(bus, nfd, nfd);
676 log_warning("Failed to set fd on new connection bus: %s", strerror(-r));
682 r = bus_check_peercred(bus);
684 log_warning("Incoming private connection from unprivileged client, refusing: %s", strerror(-r));
688 assert_se(sd_id128_randomize(&id) >= 0);
690 r = sd_bus_set_server(bus, 1, id);
692 log_warning("Failed to enable server support for new connection bus: %s", strerror(-r));
696 r = sd_bus_start(bus);
698 log_warning("Failed to start new connection bus: %s", strerror(-r));
702 r = sd_bus_attach_event(bus, m->event, SD_EVENT_PRIORITY_NORMAL);
704 log_warning("Failed to attach new connection bus to event loop: %s", strerror(-r));
708 if (m->running_as == SYSTEMD_SYSTEM) {
709 /* When we run as system instance we get the Released
710 * signal via a direct connection */
712 r = sd_bus_add_match(
715 "interface='org.freedesktop.systemd1.Agent',"
717 "path='/org/freedesktop/systemd1/agent'",
718 signal_agent_released, m);
721 log_warning("Failed to register Released match on new connection bus: %s", strerror(-r));
726 r = bus_setup_disconnected_match(m, bus);
730 r = bus_setup_api_vtables(m, bus);
732 log_warning("Failed to set up API vtables on new connection bus: %s", strerror(-r));
736 r = set_put(m->private_buses, bus);
738 log_warning("Failed to add new conenction bus to set: %s", strerror(-r));
744 log_debug("Accepted new private connection.");
749 static int bus_list_names(Manager *m, sd_bus *bus) {
750 _cleanup_strv_free_ char **names = NULL;
757 r = sd_bus_list_names(bus, &names, NULL);
759 log_error("Failed to get initial list of names: %s", strerror(-r));
763 /* This is a bit hacky, we say the owner of the name is the
764 * name itself, because we don't want the extra traffic to
765 * figure out the real owner. */
766 STRV_FOREACH(i, names)
767 manager_dispatch_bus_name_owner_changed(m, *i, NULL, *i);
772 static int bus_setup_api(Manager *m, sd_bus *bus) {
778 r = bus_setup_api_vtables(m, bus);
782 r = sd_bus_add_match(
785 "sender='org.freedesktop.DBus',"
786 "path='/org/freedesktop/DBus',"
787 "interface='org.freedesktop.DBus',"
788 "member='NameOwnerChanged'",
789 signal_name_owner_changed, m);
791 log_warning("Failed to subscribe to NameOwnerChanged signal: %s", strerror(-r));
793 r = sd_bus_add_match(
796 "sender='org.freedesktop.DBus',"
797 "path='/org/freedesktop/DBus',"
798 "interface='org.freedesktop.systemd1.Activator',"
799 "member='ActivationRequest'",
800 signal_activation_request, m);
802 log_warning("Failed to subscribe to activation signal: %s", strerror(-r));
804 /* Allow replacing of our name, to ease implementation of
805 * reexecution, where we keep the old connection open until
806 * after the new connection is set up and the name installed
807 * to allow clients to synchronously wait for reexecution to
809 r = sd_bus_request_name(bus,"org.freedesktop.systemd1", SD_BUS_NAME_REPLACE_EXISTING|SD_BUS_NAME_ALLOW_REPLACEMENT);
811 log_error("Failed to register name: %s", strerror(-r));
815 bus_list_names(m, bus);
817 log_debug("Successfully connected to API bus.");
821 static int bus_init_api(Manager *m) {
822 _cleanup_bus_unref_ sd_bus *bus = NULL;
828 /* The API and system bus is the same if we are running in system mode */
829 if (m->running_as == SYSTEMD_SYSTEM && m->system_bus)
830 bus = sd_bus_ref(m->system_bus);
832 if (m->running_as == SYSTEMD_SYSTEM)
833 r = sd_bus_open_system(&bus);
835 r = sd_bus_open_user(&bus);
838 log_debug("Failed to connect to API bus, retrying later...");
842 r = sd_bus_attach_event(bus, m->event, SD_EVENT_PRIORITY_NORMAL);
844 log_error("Failed to attach API bus to event loop: %s", strerror(-r));
848 r = bus_setup_disconnected_match(m, bus);
853 r = bus_setup_api(m, bus);
855 log_error("Failed to set up API bus: %s", strerror(-r));
865 static int bus_setup_system(Manager *m, sd_bus *bus) {
871 if (m->running_as == SYSTEMD_SYSTEM)
874 /* If we are a user instance we get the Released message via
876 r = sd_bus_add_match(
879 "interface='org.freedesktop.systemd1.Agent',"
881 "path='/org/freedesktop/systemd1/agent'",
882 signal_agent_released, m);
885 log_warning("Failed to register Released match on system bus: %s", strerror(-r));
887 log_debug("Successfully connected to system bus.");
891 static int bus_init_system(Manager *m) {
892 _cleanup_bus_unref_ sd_bus *bus = NULL;
898 /* The API and system bus is the same if we are running in system mode */
899 if (m->running_as == SYSTEMD_SYSTEM && m->api_bus) {
900 m->system_bus = sd_bus_ref(m->api_bus);
904 r = sd_bus_open_system(&bus);
906 log_debug("Failed to connect to system bus, retrying later...");
910 r = bus_setup_disconnected_match(m, bus);
914 r = sd_bus_attach_event(bus, m->event, SD_EVENT_PRIORITY_NORMAL);
916 log_error("Failed to attach system bus to event loop: %s", strerror(-r));
920 r = bus_setup_system(m, bus);
922 log_error("Fauiled to set up system bus: %s", strerror(-r));
932 static int bus_init_private(Manager *m) {
933 _cleanup_close_ int fd = -1;
934 union sockaddr_union sa = {
935 .un.sun_family = AF_UNIX
943 if (m->private_listen_fd >= 0)
946 /* We don't need the private socket if we have kdbus */
947 if (m->kdbus_fd >= 0)
950 if (m->running_as == SYSTEMD_SYSTEM) {
952 /* We want the private bus only when running as init */
956 strcpy(sa.un.sun_path, "/run/systemd/private");
957 salen = offsetof(union sockaddr_union, un.sun_path) + sizeof("/run/systemd/private") - 1;
959 size_t left = sizeof(sa.un.sun_path);
960 char *p = sa.un.sun_path;
963 e = secure_getenv("XDG_RUNTIME_DIR");
965 log_error("Failed to determine XDG_RUNTIME_DIR");
969 left = strpcpy(&p, left, e);
970 left = strpcpy(&p, left, "/systemd/private");
972 salen = sizeof(sa.un) - left;
974 mkdir_parents_label(sa.un.sun_path, 0755);
977 unlink(sa.un.sun_path);
979 fd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
981 log_error("Failed to allocate private socket: %m");
985 r = bind(fd, &sa.sa, salen);
987 log_error("Failed to bind private socket: %m");
991 r = listen(fd, SOMAXCONN);
993 log_error("Failed to make private socket listening: %m");
997 r = sd_event_add_io(m->event, fd, EPOLLIN, bus_on_connection, m, &s);
999 log_error("Failed to allocate event source: %s", strerror(-r));
1003 m->private_listen_fd = fd;
1004 m->private_listen_event_source = s;
1007 log_debug("Successfully created private D-Bus server.");
1012 int bus_init(Manager *m, bool try_bus_connect) {
1015 if (try_bus_connect) {
1016 r = bus_init_system(m);
1020 r = bus_init_api(m);
1025 r = bus_init_private(m);
1032 static void destroy_bus(Manager *m, sd_bus **bus) {
1042 /* Get rid of tracked clients on this bus */
1043 bus_client_untrack_bus(m->subscribed, *bus);
1044 HASHMAP_FOREACH(j, m->jobs, i)
1045 bus_client_untrack_bus(j->subscribed, *bus);
1047 /* Get rid of queued message on this bus */
1048 if (m->queued_message_bus == *bus) {
1049 m->queued_message_bus = sd_bus_unref(m->queued_message_bus);
1051 if (m->queued_message)
1052 m->queued_message = sd_bus_message_unref(m->queued_message);
1055 /* Possibly flush unwritten data, but only if we are
1056 * unprivileged, since we don't want to sync here */
1057 if (m->running_as != SYSTEMD_SYSTEM)
1060 /* And destroy the object */
1062 *bus = sd_bus_unref(*bus);
1065 void bus_done(Manager *m) {
1071 destroy_bus(m, &m->api_bus);
1073 destroy_bus(m, &m->system_bus);
1074 while ((b = set_steal_first(m->private_buses)))
1077 set_free(m->private_buses);
1078 set_free(m->subscribed);
1080 if (m->private_listen_event_source)
1081 m->private_listen_event_source = sd_event_source_unref(m->private_listen_event_source);
1083 if (m->private_listen_fd >= 0) {
1084 close_nointr_nofail(m->private_listen_fd);
1085 m->private_listen_fd = -1;
1089 int bus_fdset_add_all(Manager *m, FDSet *fds) {
1097 /* When we are about to reexecute we add all D-Bus fds to the
1098 * set to pass over to the newly executed systemd. They won't
1099 * be used there however, except thatt they are closed at the
1100 * very end of deserialization, those making it possible for
1101 * clients to synchronously wait for systemd to reexec by
1102 * simply waiting for disconnection */
1105 fd = sd_bus_get_fd(m->api_bus);
1107 fd = fdset_put_dup(fds, fd);
1113 SET_FOREACH(b, m->private_buses, i) {
1114 fd = sd_bus_get_fd(b);
1116 fd = fdset_put_dup(fds, fd);
1122 /* We don't offer any APIs on the system bus (well, unless it
1123 * is the same as the API bus) hence we don't bother with it
1129 void bus_serialize(Manager *m, FILE *f) {
1133 bus_client_track_serialize(m, f, m->subscribed);
1136 int bus_deserialize_item(Manager *m, const char *line) {
1140 return bus_client_track_deserialize_item(m, &m->subscribed, line);