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