| /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
| |
| /*** |
| This file is part of systemd. |
| |
| Copyright 2013 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 <sys/mman.h> |
| |
| #include "special.h" |
| #include "formats-util.h" |
| #include "signal-util.h" |
| #include "bus-kernel.h" |
| #include "bus-internal.h" |
| #include "bus-util.h" |
| #include "kdbus.h" |
| #include "bus-policy.h" |
| #include "service.h" |
| #include "dbus-busname.h" |
| #include "busname.h" |
| |
| static const UnitActiveState state_translation_table[_BUSNAME_STATE_MAX] = { |
| [BUSNAME_DEAD] = UNIT_INACTIVE, |
| [BUSNAME_MAKING] = UNIT_ACTIVATING, |
| [BUSNAME_REGISTERED] = UNIT_ACTIVE, |
| [BUSNAME_LISTENING] = UNIT_ACTIVE, |
| [BUSNAME_RUNNING] = UNIT_ACTIVE, |
| [BUSNAME_SIGTERM] = UNIT_DEACTIVATING, |
| [BUSNAME_SIGKILL] = UNIT_DEACTIVATING, |
| [BUSNAME_FAILED] = UNIT_FAILED |
| }; |
| |
| static int busname_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata); |
| static int busname_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata); |
| |
| static void busname_init(Unit *u) { |
| BusName *n = BUSNAME(u); |
| |
| assert(u); |
| assert(u->load_state == UNIT_STUB); |
| |
| n->starter_fd = -1; |
| n->accept_fd = true; |
| n->activating = true; |
| |
| n->timeout_usec = u->manager->default_timeout_start_usec; |
| } |
| |
| static void busname_unwatch_control_pid(BusName *n) { |
| assert(n); |
| |
| if (n->control_pid <= 0) |
| return; |
| |
| unit_unwatch_pid(UNIT(n), n->control_pid); |
| n->control_pid = 0; |
| } |
| |
| static void busname_free_policy(BusName *n) { |
| BusNamePolicy *p; |
| |
| assert(n); |
| |
| while ((p = n->policy)) { |
| LIST_REMOVE(policy, n->policy, p); |
| |
| free(p->name); |
| free(p); |
| } |
| } |
| |
| static void busname_close_fd(BusName *n) { |
| assert(n); |
| |
| n->starter_event_source = sd_event_source_unref(n->starter_event_source); |
| n->starter_fd = safe_close(n->starter_fd); |
| } |
| |
| static void busname_done(Unit *u) { |
| BusName *n = BUSNAME(u); |
| |
| assert(n); |
| |
| free(n->name); |
| n->name = NULL; |
| |
| busname_free_policy(n); |
| busname_unwatch_control_pid(n); |
| busname_close_fd(n); |
| |
| unit_ref_unset(&n->service); |
| |
| n->timer_event_source = sd_event_source_unref(n->timer_event_source); |
| } |
| |
| static int busname_arm_timer(BusName *n) { |
| int r; |
| |
| assert(n); |
| |
| if (n->timeout_usec <= 0) { |
| n->timer_event_source = sd_event_source_unref(n->timer_event_source); |
| return 0; |
| } |
| |
| if (n->timer_event_source) { |
| r = sd_event_source_set_time(n->timer_event_source, now(CLOCK_MONOTONIC) + n->timeout_usec); |
| if (r < 0) |
| return r; |
| |
| return sd_event_source_set_enabled(n->timer_event_source, SD_EVENT_ONESHOT); |
| } |
| |
| r = sd_event_add_time( |
| UNIT(n)->manager->event, |
| &n->timer_event_source, |
| CLOCK_MONOTONIC, |
| now(CLOCK_MONOTONIC) + n->timeout_usec, 0, |
| busname_dispatch_timer, n); |
| if (r < 0) |
| return r; |
| |
| (void) sd_event_source_set_description(n->timer_event_source, "busname-timer"); |
| |
| return 0; |
| } |
| |
| static int busname_add_default_default_dependencies(BusName *n) { |
| int r; |
| |
| assert(n); |
| |
| r = unit_add_dependency_by_name(UNIT(n), UNIT_BEFORE, SPECIAL_BUSNAMES_TARGET, NULL, true); |
| if (r < 0) |
| return r; |
| |
| if (UNIT(n)->manager->running_as == MANAGER_SYSTEM) { |
| r = unit_add_two_dependencies_by_name(UNIT(n), UNIT_AFTER, UNIT_REQUIRES, SPECIAL_SYSINIT_TARGET, NULL, true); |
| if (r < 0) |
| return r; |
| } |
| |
| return unit_add_two_dependencies_by_name(UNIT(n), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_SHUTDOWN_TARGET, NULL, true); |
| } |
| |
| static int busname_add_extras(BusName *n) { |
| Unit *u = UNIT(n); |
| int r; |
| |
| assert(n); |
| |
| if (!n->name) { |
| r = unit_name_to_prefix(u->id, &n->name); |
| if (r < 0) |
| return r; |
| } |
| |
| if (!u->description) { |
| r = unit_set_description(u, n->name); |
| if (r < 0) |
| return r; |
| } |
| |
| if (n->activating) { |
| if (!UNIT_DEREF(n->service)) { |
| Unit *x; |
| |
| r = unit_load_related_unit(u, ".service", &x); |
| if (r < 0) |
| return r; |
| |
| unit_ref_set(&n->service, x); |
| } |
| |
| r = unit_add_two_dependencies(u, UNIT_BEFORE, UNIT_TRIGGERS, UNIT_DEREF(n->service), true); |
| if (r < 0) |
| return r; |
| } |
| |
| if (u->default_dependencies) { |
| r = busname_add_default_default_dependencies(n); |
| if (r < 0) |
| return r; |
| } |
| |
| return 0; |
| } |
| |
| static int busname_verify(BusName *n) { |
| char *e; |
| |
| assert(n); |
| |
| if (UNIT(n)->load_state != UNIT_LOADED) |
| return 0; |
| |
| if (!service_name_is_valid(n->name)) { |
| log_unit_error(UNIT(n), "Name= setting is not a valid service name Refusing."); |
| return -EINVAL; |
| } |
| |
| e = strjoina(n->name, ".busname"); |
| if (!unit_has_name(UNIT(n), e)) { |
| log_unit_error(UNIT(n), "Name= setting doesn't match unit name. Refusing."); |
| return -EINVAL; |
| } |
| |
| return 0; |
| } |
| |
| static int busname_load(Unit *u) { |
| BusName *n = BUSNAME(u); |
| int r; |
| |
| assert(u); |
| assert(u->load_state == UNIT_STUB); |
| |
| r = unit_load_fragment_and_dropin(u); |
| if (r < 0) |
| return r; |
| |
| if (u->load_state == UNIT_LOADED) { |
| /* This is a new unit? Then let's add in some extras */ |
| r = busname_add_extras(n); |
| if (r < 0) |
| return r; |
| } |
| |
| return busname_verify(n); |
| } |
| |
| static void busname_dump(Unit *u, FILE *f, const char *prefix) { |
| BusName *n = BUSNAME(u); |
| |
| assert(n); |
| assert(f); |
| |
| fprintf(f, |
| "%sBus Name State: %s\n" |
| "%sResult: %s\n" |
| "%sName: %s\n" |
| "%sActivating: %s\n" |
| "%sAccept FD: %s\n", |
| prefix, busname_state_to_string(n->state), |
| prefix, busname_result_to_string(n->result), |
| prefix, n->name, |
| prefix, yes_no(n->activating), |
| prefix, yes_no(n->accept_fd)); |
| |
| if (n->control_pid > 0) |
| fprintf(f, |
| "%sControl PID: "PID_FMT"\n", |
| prefix, n->control_pid); |
| } |
| |
| static void busname_unwatch_fd(BusName *n) { |
| int r; |
| |
| assert(n); |
| |
| if (!n->starter_event_source) |
| return; |
| |
| r = sd_event_source_set_enabled(n->starter_event_source, SD_EVENT_OFF); |
| if (r < 0) |
| log_unit_debug_errno(UNIT(n), r, "Failed to disable event source: %m"); |
| } |
| |
| static int busname_watch_fd(BusName *n) { |
| int r; |
| |
| assert(n); |
| |
| if (n->starter_fd < 0) |
| return 0; |
| |
| if (n->starter_event_source) { |
| r = sd_event_source_set_enabled(n->starter_event_source, SD_EVENT_ON); |
| if (r < 0) |
| goto fail; |
| } else { |
| r = sd_event_add_io(UNIT(n)->manager->event, &n->starter_event_source, n->starter_fd, EPOLLIN, busname_dispatch_io, n); |
| if (r < 0) |
| goto fail; |
| |
| (void) sd_event_source_set_description(n->starter_event_source, "busname-starter"); |
| } |
| |
| return 0; |
| |
| fail: |
| log_unit_warning_errno(UNIT(n), r, "Failed to watch starter fd: %m"); |
| busname_unwatch_fd(n); |
| return r; |
| } |
| |
| static int busname_open_fd(BusName *n) { |
| _cleanup_free_ char *path = NULL; |
| const char *mode; |
| |
| assert(n); |
| |
| if (n->starter_fd >= 0) |
| return 0; |
| |
| mode = UNIT(n)->manager->running_as == MANAGER_SYSTEM ? "system" : "user"; |
| n->starter_fd = bus_kernel_open_bus_fd(mode, &path); |
| if (n->starter_fd < 0) |
| return log_unit_warning_errno(UNIT(n), n->starter_fd, "Failed to open %s: %m", path ?: "kdbus"); |
| |
| return 0; |
| } |
| |
| static void busname_set_state(BusName *n, BusNameState state) { |
| BusNameState old_state; |
| assert(n); |
| |
| old_state = n->state; |
| n->state = state; |
| |
| if (!IN_SET(state, BUSNAME_MAKING, BUSNAME_SIGTERM, BUSNAME_SIGKILL)) { |
| n->timer_event_source = sd_event_source_unref(n->timer_event_source); |
| busname_unwatch_control_pid(n); |
| } |
| |
| if (state != BUSNAME_LISTENING) |
| busname_unwatch_fd(n); |
| |
| if (!IN_SET(state, BUSNAME_LISTENING, BUSNAME_MAKING, BUSNAME_REGISTERED, BUSNAME_RUNNING)) |
| busname_close_fd(n); |
| |
| if (state != old_state) |
| log_unit_debug(UNIT(n), "Changed %s -> %s", busname_state_to_string(old_state), busname_state_to_string(state)); |
| |
| unit_notify(UNIT(n), state_translation_table[old_state], state_translation_table[state], true); |
| } |
| |
| static int busname_coldplug(Unit *u) { |
| BusName *n = BUSNAME(u); |
| int r; |
| |
| assert(n); |
| assert(n->state == BUSNAME_DEAD); |
| |
| if (n->deserialized_state == n->state) |
| return 0; |
| |
| if (IN_SET(n->deserialized_state, BUSNAME_MAKING, BUSNAME_SIGTERM, BUSNAME_SIGKILL)) { |
| |
| if (n->control_pid <= 0) |
| return -EBADMSG; |
| |
| r = unit_watch_pid(UNIT(n), n->control_pid); |
| if (r < 0) |
| return r; |
| |
| r = busname_arm_timer(n); |
| if (r < 0) |
| return r; |
| } |
| |
| if (IN_SET(n->deserialized_state, BUSNAME_MAKING, BUSNAME_LISTENING, BUSNAME_REGISTERED, BUSNAME_RUNNING)) { |
| r = busname_open_fd(n); |
| if (r < 0) |
| return r; |
| } |
| |
| if (n->deserialized_state == BUSNAME_LISTENING) { |
| r = busname_watch_fd(n); |
| if (r < 0) |
| return r; |
| } |
| |
| busname_set_state(n, n->deserialized_state); |
| return 0; |
| } |
| |
| static int busname_make_starter(BusName *n, pid_t *_pid) { |
| pid_t pid; |
| int r; |
| |
| r = busname_arm_timer(n); |
| if (r < 0) |
| goto fail; |
| |
| /* We have to resolve the user/group names out-of-process, |
| * hence let's fork here. It's messy, but well, what can we |
| * do? */ |
| |
| pid = fork(); |
| if (pid < 0) |
| return -errno; |
| |
| if (pid == 0) { |
| int ret; |
| |
| (void) default_signals(SIGNALS_CRASH_HANDLER, SIGNALS_IGNORE, -1); |
| (void) ignore_signals(SIGPIPE, -1); |
| log_forget_fds(); |
| |
| r = bus_kernel_make_starter(n->starter_fd, n->name, n->activating, n->accept_fd, n->policy, n->policy_world); |
| if (r < 0) { |
| ret = EXIT_MAKE_STARTER; |
| goto fail_child; |
| } |
| |
| _exit(0); |
| |
| fail_child: |
| log_open(); |
| log_error_errno(r, "Failed to create starter connection at step %s: %m", exit_status_to_string(ret, EXIT_STATUS_SYSTEMD)); |
| |
| _exit(ret); |
| } |
| |
| r = unit_watch_pid(UNIT(n), pid); |
| if (r < 0) |
| goto fail; |
| |
| *_pid = pid; |
| return 0; |
| |
| fail: |
| n->timer_event_source = sd_event_source_unref(n->timer_event_source); |
| return r; |
| } |
| |
| static void busname_enter_dead(BusName *n, BusNameResult f) { |
| assert(n); |
| |
| if (f != BUSNAME_SUCCESS) |
| n->result = f; |
| |
| busname_set_state(n, n->result != BUSNAME_SUCCESS ? BUSNAME_FAILED : BUSNAME_DEAD); |
| } |
| |
| static void busname_enter_signal(BusName *n, BusNameState state, BusNameResult f) { |
| KillContext kill_context = {}; |
| int r; |
| |
| assert(n); |
| |
| if (f != BUSNAME_SUCCESS) |
| n->result = f; |
| |
| kill_context_init(&kill_context); |
| |
| r = unit_kill_context(UNIT(n), |
| &kill_context, |
| state != BUSNAME_SIGTERM ? KILL_KILL : KILL_TERMINATE, |
| -1, |
| n->control_pid, |
| false); |
| if (r < 0) { |
| log_unit_warning_errno(UNIT(n), r, "Failed to kill control process: %m"); |
| goto fail; |
| } |
| |
| if (r > 0) { |
| r = busname_arm_timer(n); |
| if (r < 0) { |
| log_unit_warning_errno(UNIT(n), r, "Failed to arm timer: %m"); |
| goto fail; |
| } |
| |
| busname_set_state(n, state); |
| } else if (state == BUSNAME_SIGTERM) |
| busname_enter_signal(n, BUSNAME_SIGKILL, BUSNAME_SUCCESS); |
| else |
| busname_enter_dead(n, BUSNAME_SUCCESS); |
| |
| return; |
| |
| fail: |
| busname_enter_dead(n, BUSNAME_FAILURE_RESOURCES); |
| } |
| |
| static void busname_enter_listening(BusName *n) { |
| int r; |
| |
| assert(n); |
| |
| if (n->activating) { |
| r = busname_watch_fd(n); |
| if (r < 0) { |
| log_unit_warning_errno(UNIT(n), r, "Failed to watch names: %m"); |
| goto fail; |
| } |
| |
| busname_set_state(n, BUSNAME_LISTENING); |
| } else |
| busname_set_state(n, BUSNAME_REGISTERED); |
| |
| return; |
| |
| fail: |
| busname_enter_signal(n, BUSNAME_SIGTERM, BUSNAME_FAILURE_RESOURCES); |
| } |
| |
| static void busname_enter_making(BusName *n) { |
| int r; |
| |
| assert(n); |
| |
| r = busname_open_fd(n); |
| if (r < 0) |
| goto fail; |
| |
| if (n->policy) { |
| /* If there is a policy, we need to resolve user/group |
| * names, which we can't do from PID1, hence let's |
| * fork. */ |
| busname_unwatch_control_pid(n); |
| |
| r = busname_make_starter(n, &n->control_pid); |
| if (r < 0) { |
| log_unit_warning_errno(UNIT(n), r, "Failed to fork 'making' task: %m"); |
| goto fail; |
| } |
| |
| busname_set_state(n, BUSNAME_MAKING); |
| } else { |
| /* If there is no policy, we can do everything |
| * directly from PID 1, hence do so. */ |
| |
| r = bus_kernel_make_starter(n->starter_fd, n->name, n->activating, n->accept_fd, NULL, n->policy_world); |
| if (r < 0) { |
| log_unit_warning_errno(UNIT(n), r, "Failed to make starter: %m"); |
| goto fail; |
| } |
| |
| busname_enter_listening(n); |
| } |
| |
| return; |
| |
| fail: |
| busname_enter_dead(n, BUSNAME_FAILURE_RESOURCES); |
| } |
| |
| static void busname_enter_running(BusName *n) { |
| _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; |
| bool pending = false; |
| Unit *other; |
| Iterator i; |
| int r; |
| |
| assert(n); |
| |
| if (!n->activating) |
| return; |
| |
| /* We don't take connections anymore if we are supposed to |
| * shut down anyway */ |
| |
| if (unit_stop_pending(UNIT(n))) { |
| log_unit_debug(UNIT(n), "Suppressing activation request since unit stop is scheduled."); |
| |
| /* Flush all queued activation reqeuest by closing and reopening the connection */ |
| bus_kernel_drop_one(n->starter_fd); |
| |
| busname_enter_listening(n); |
| return; |
| } |
| |
| /* If there's already a start pending don't bother to do |
| * anything */ |
| SET_FOREACH(other, UNIT(n)->dependencies[UNIT_TRIGGERS], i) |
| if (unit_active_or_pending(other)) { |
| pending = true; |
| break; |
| } |
| |
| if (!pending) { |
| r = manager_add_job(UNIT(n)->manager, JOB_START, UNIT_DEREF(n->service), JOB_REPLACE, true, &error, NULL); |
| if (r < 0) |
| goto fail; |
| } |
| |
| busname_set_state(n, BUSNAME_RUNNING); |
| return; |
| |
| fail: |
| log_unit_warning(UNIT(n), "Failed to queue service startup job: %s", bus_error_message(&error, r)); |
| busname_enter_dead(n, BUSNAME_FAILURE_RESOURCES); |
| } |
| |
| static int busname_start(Unit *u) { |
| BusName *n = BUSNAME(u); |
| |
| assert(n); |
| |
| /* We cannot fulfill this request right now, try again later |
| * please! */ |
| if (IN_SET(n->state, BUSNAME_SIGTERM, BUSNAME_SIGKILL)) |
| return -EAGAIN; |
| |
| /* Already on it! */ |
| if (n->state == BUSNAME_MAKING) |
| return 0; |
| |
| if (n->activating && UNIT_ISSET(n->service)) { |
| Service *service; |
| |
| service = SERVICE(UNIT_DEREF(n->service)); |
| |
| if (UNIT(service)->load_state != UNIT_LOADED) { |
| log_unit_error(u, "Bus service %s not loaded, refusing.", UNIT(service)->id); |
| return -ENOENT; |
| } |
| } |
| |
| assert(IN_SET(n->state, BUSNAME_DEAD, BUSNAME_FAILED)); |
| |
| n->result = BUSNAME_SUCCESS; |
| busname_enter_making(n); |
| |
| return 1; |
| } |
| |
| static int busname_stop(Unit *u) { |
| BusName *n = BUSNAME(u); |
| |
| assert(n); |
| |
| /* Already on it */ |
| if (IN_SET(n->state, BUSNAME_SIGTERM, BUSNAME_SIGKILL)) |
| return 0; |
| |
| /* If there's already something running, we go directly into |
| * kill mode. */ |
| |
| if (n->state == BUSNAME_MAKING) { |
| busname_enter_signal(n, BUSNAME_SIGTERM, BUSNAME_SUCCESS); |
| return -EAGAIN; |
| } |
| |
| assert(IN_SET(n->state, BUSNAME_REGISTERED, BUSNAME_LISTENING, BUSNAME_RUNNING)); |
| |
| busname_enter_dead(n, BUSNAME_SUCCESS); |
| return 1; |
| } |
| |
| static int busname_serialize(Unit *u, FILE *f, FDSet *fds) { |
| BusName *n = BUSNAME(u); |
| |
| assert(n); |
| assert(f); |
| assert(fds); |
| |
| unit_serialize_item(u, f, "state", busname_state_to_string(n->state)); |
| unit_serialize_item(u, f, "result", busname_result_to_string(n->result)); |
| |
| if (n->control_pid > 0) |
| unit_serialize_item_format(u, f, "control-pid", PID_FMT, n->control_pid); |
| |
| if (n->starter_fd >= 0) { |
| int copy; |
| |
| copy = fdset_put_dup(fds, n->starter_fd); |
| if (copy < 0) |
| return copy; |
| |
| unit_serialize_item_format(u, f, "starter-fd", "%i", copy); |
| } |
| |
| return 0; |
| } |
| |
| static int busname_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) { |
| BusName *n = BUSNAME(u); |
| |
| assert(n); |
| assert(key); |
| assert(value); |
| |
| if (streq(key, "state")) { |
| BusNameState state; |
| |
| state = busname_state_from_string(value); |
| if (state < 0) |
| log_unit_debug(u, "Failed to parse state value: %s", value); |
| else |
| n->deserialized_state = state; |
| |
| } else if (streq(key, "result")) { |
| BusNameResult f; |
| |
| f = busname_result_from_string(value); |
| if (f < 0) |
| log_unit_debug(u, "Failed to parse result value: %s", value); |
| else if (f != BUSNAME_SUCCESS) |
| n->result = f; |
| |
| } else if (streq(key, "control-pid")) { |
| pid_t pid; |
| |
| if (parse_pid(value, &pid) < 0) |
| log_unit_debug(u, "Failed to parse control-pid value: %s", value); |
| else |
| n->control_pid = pid; |
| } else if (streq(key, "starter-fd")) { |
| int fd; |
| |
| if (safe_atoi(value, &fd) < 0 || fd < 0 || !fdset_contains(fds, fd)) |
| log_unit_debug(u, "Failed to parse starter fd value: %s", value); |
| else { |
| safe_close(n->starter_fd); |
| n->starter_fd = fdset_remove(fds, fd); |
| } |
| } else |
| log_unit_debug(u, "Unknown serialization key: %s", key); |
| |
| return 0; |
| } |
| |
| _pure_ static UnitActiveState busname_active_state(Unit *u) { |
| assert(u); |
| |
| return state_translation_table[BUSNAME(u)->state]; |
| } |
| |
| _pure_ static const char *busname_sub_state_to_string(Unit *u) { |
| assert(u); |
| |
| return busname_state_to_string(BUSNAME(u)->state); |
| } |
| |
| static int busname_peek_message(BusName *n) { |
| struct kdbus_cmd_recv cmd_recv = { |
| .size = sizeof(cmd_recv), |
| .flags = KDBUS_RECV_PEEK, |
| }; |
| struct kdbus_cmd_free cmd_free = { |
| .size = sizeof(cmd_free), |
| }; |
| const char *comm = NULL; |
| struct kdbus_item *d; |
| struct kdbus_msg *k; |
| size_t start, ps, sz, delta; |
| void *p = NULL; |
| pid_t pid = 0; |
| int r; |
| |
| /* Generate a friendly debug log message about which process |
| * caused triggering of this bus name. This simply peeks the |
| * metadata of the first queued message and logs it. */ |
| |
| assert(n); |
| |
| /* Let's shortcut things a bit, if debug logging is turned off |
| * anyway. */ |
| |
| if (log_get_max_level() < LOG_DEBUG) |
| return 0; |
| |
| r = ioctl(n->starter_fd, KDBUS_CMD_RECV, &cmd_recv); |
| if (r < 0) { |
| if (errno == EINTR || errno == EAGAIN) |
| return 0; |
| |
| return log_unit_error_errno(UNIT(n), errno, "Failed to query activation message: %m"); |
| } |
| |
| /* We map as late as possible, and unmap imemdiately after |
| * use. On 32bit address space is scarce and we want to be |
| * able to handle a lot of activator connections at the same |
| * time, and hence shouldn't keep the mmap()s around for |
| * longer than necessary. */ |
| |
| ps = page_size(); |
| start = (cmd_recv.msg.offset / ps) * ps; |
| delta = cmd_recv.msg.offset - start; |
| sz = PAGE_ALIGN(delta + cmd_recv.msg.msg_size); |
| |
| p = mmap(NULL, sz, PROT_READ, MAP_SHARED, n->starter_fd, start); |
| if (p == MAP_FAILED) { |
| r = log_unit_error_errno(UNIT(n), errno, "Failed to map activation message: %m"); |
| goto finish; |
| } |
| |
| k = (struct kdbus_msg *) ((uint8_t *) p + delta); |
| KDBUS_ITEM_FOREACH(d, k, items) { |
| switch (d->type) { |
| |
| case KDBUS_ITEM_PIDS: |
| pid = d->pids.pid; |
| break; |
| |
| case KDBUS_ITEM_PID_COMM: |
| comm = d->str; |
| break; |
| } |
| } |
| |
| if (pid > 0) |
| log_unit_debug(UNIT(n), "Activation triggered by process " PID_FMT " (%s)", pid, strna(comm)); |
| |
| r = 0; |
| |
| finish: |
| if (p) |
| (void) munmap(p, sz); |
| |
| cmd_free.offset = cmd_recv.msg.offset; |
| if (ioctl(n->starter_fd, KDBUS_CMD_FREE, &cmd_free) < 0) |
| log_unit_warning(UNIT(n), "Failed to free peeked message, ignoring: %m"); |
| |
| return r; |
| } |
| |
| static int busname_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) { |
| BusName *n = userdata; |
| |
| assert(n); |
| assert(fd >= 0); |
| |
| if (n->state != BUSNAME_LISTENING) |
| return 0; |
| |
| log_unit_debug(UNIT(n), "Activation request"); |
| |
| if (revents != EPOLLIN) { |
| log_unit_error(UNIT(n), "Got unexpected poll event (0x%x) on starter fd.", revents); |
| goto fail; |
| } |
| |
| busname_peek_message(n); |
| busname_enter_running(n); |
| return 0; |
| fail: |
| |
| busname_enter_dead(n, BUSNAME_FAILURE_RESOURCES); |
| return 0; |
| } |
| |
| static void busname_sigchld_event(Unit *u, pid_t pid, int code, int status) { |
| BusName *n = BUSNAME(u); |
| BusNameResult f; |
| |
| assert(n); |
| assert(pid >= 0); |
| |
| if (pid != n->control_pid) |
| return; |
| |
| n->control_pid = 0; |
| |
| if (is_clean_exit(code, status, NULL)) |
| f = BUSNAME_SUCCESS; |
| else if (code == CLD_EXITED) |
| f = BUSNAME_FAILURE_EXIT_CODE; |
| else if (code == CLD_KILLED) |
| f = BUSNAME_FAILURE_SIGNAL; |
| else if (code == CLD_DUMPED) |
| f = BUSNAME_FAILURE_CORE_DUMP; |
| else |
| assert_not_reached("Unknown sigchld code"); |
| |
| log_unit_full(u, f == BUSNAME_SUCCESS ? LOG_DEBUG : LOG_NOTICE, 0, |
| "Control process exited, code=%s status=%i", sigchld_code_to_string(code), status); |
| |
| if (f != BUSNAME_SUCCESS) |
| n->result = f; |
| |
| switch (n->state) { |
| |
| case BUSNAME_MAKING: |
| if (f == BUSNAME_SUCCESS) |
| busname_enter_listening(n); |
| else |
| busname_enter_signal(n, BUSNAME_SIGTERM, f); |
| break; |
| |
| case BUSNAME_SIGTERM: |
| case BUSNAME_SIGKILL: |
| busname_enter_dead(n, f); |
| break; |
| |
| default: |
| assert_not_reached("Uh, control process died at wrong time."); |
| } |
| |
| /* Notify clients about changed exit status */ |
| unit_add_to_dbus_queue(u); |
| } |
| |
| static int busname_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) { |
| BusName *n = BUSNAME(userdata); |
| |
| assert(n); |
| assert(n->timer_event_source == source); |
| |
| switch (n->state) { |
| |
| case BUSNAME_MAKING: |
| log_unit_warning(UNIT(n), "Making timed out. Terminating."); |
| busname_enter_signal(n, BUSNAME_SIGTERM, BUSNAME_FAILURE_TIMEOUT); |
| break; |
| |
| case BUSNAME_SIGTERM: |
| log_unit_warning(UNIT(n), "Stopping timed out. Killing."); |
| busname_enter_signal(n, BUSNAME_SIGKILL, BUSNAME_FAILURE_TIMEOUT); |
| break; |
| |
| case BUSNAME_SIGKILL: |
| log_unit_warning(UNIT(n), "Processes still around after SIGKILL. Ignoring."); |
| busname_enter_dead(n, BUSNAME_FAILURE_TIMEOUT); |
| break; |
| |
| default: |
| assert_not_reached("Timeout at wrong time."); |
| } |
| |
| return 0; |
| } |
| |
| static void busname_reset_failed(Unit *u) { |
| BusName *n = BUSNAME(u); |
| |
| assert(n); |
| |
| if (n->state == BUSNAME_FAILED) |
| busname_set_state(n, BUSNAME_DEAD); |
| |
| n->result = BUSNAME_SUCCESS; |
| } |
| |
| static void busname_trigger_notify(Unit *u, Unit *other) { |
| BusName *n = BUSNAME(u); |
| Service *s; |
| |
| assert(n); |
| assert(other); |
| |
| if (!IN_SET(n->state, BUSNAME_RUNNING, BUSNAME_LISTENING)) |
| return; |
| |
| if (other->load_state != UNIT_LOADED || other->type != UNIT_SERVICE) |
| return; |
| |
| s = SERVICE(other); |
| |
| if (s->state == SERVICE_FAILED && s->result == SERVICE_FAILURE_START_LIMIT) |
| busname_enter_dead(n, BUSNAME_FAILURE_SERVICE_FAILED_PERMANENT); |
| else if (IN_SET(s->state, |
| SERVICE_DEAD, SERVICE_FAILED, |
| SERVICE_STOP, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL, |
| SERVICE_STOP_POST, SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL, |
| SERVICE_AUTO_RESTART)) |
| busname_enter_listening(n); |
| } |
| |
| static int busname_kill(Unit *u, KillWho who, int signo, sd_bus_error *error) { |
| return unit_kill_common(u, who, signo, -1, BUSNAME(u)->control_pid, error); |
| } |
| |
| static int busname_get_timeout(Unit *u, uint64_t *timeout) { |
| BusName *n = BUSNAME(u); |
| int r; |
| |
| if (!n->timer_event_source) |
| return 0; |
| |
| r = sd_event_source_get_time(n->timer_event_source, timeout); |
| if (r < 0) |
| return r; |
| |
| return 1; |
| } |
| |
| static bool busname_supported(void) { |
| static int supported = -1; |
| |
| if (supported < 0) |
| supported = is_kdbus_available(); |
| |
| return supported; |
| } |
| |
| static const char* const busname_state_table[_BUSNAME_STATE_MAX] = { |
| [BUSNAME_DEAD] = "dead", |
| [BUSNAME_MAKING] = "making", |
| [BUSNAME_REGISTERED] = "registered", |
| [BUSNAME_LISTENING] = "listening", |
| [BUSNAME_RUNNING] = "running", |
| [BUSNAME_SIGTERM] = "sigterm", |
| [BUSNAME_SIGKILL] = "sigkill", |
| [BUSNAME_FAILED] = "failed", |
| }; |
| |
| DEFINE_STRING_TABLE_LOOKUP(busname_state, BusNameState); |
| |
| static const char* const busname_result_table[_BUSNAME_RESULT_MAX] = { |
| [BUSNAME_SUCCESS] = "success", |
| [BUSNAME_FAILURE_RESOURCES] = "resources", |
| [BUSNAME_FAILURE_TIMEOUT] = "timeout", |
| [BUSNAME_FAILURE_EXIT_CODE] = "exit-code", |
| [BUSNAME_FAILURE_SIGNAL] = "signal", |
| [BUSNAME_FAILURE_CORE_DUMP] = "core-dump", |
| [BUSNAME_FAILURE_SERVICE_FAILED_PERMANENT] = "service-failed-permanent", |
| }; |
| |
| DEFINE_STRING_TABLE_LOOKUP(busname_result, BusNameResult); |
| |
| const UnitVTable busname_vtable = { |
| .object_size = sizeof(BusName), |
| |
| .sections = |
| "Unit\0" |
| "BusName\0" |
| "Install\0", |
| .private_section = "BusName", |
| |
| .no_alias = true, |
| .no_instances = true, |
| |
| .init = busname_init, |
| .done = busname_done, |
| .load = busname_load, |
| |
| .coldplug = busname_coldplug, |
| |
| .dump = busname_dump, |
| |
| .start = busname_start, |
| .stop = busname_stop, |
| |
| .kill = busname_kill, |
| |
| .get_timeout = busname_get_timeout, |
| |
| .serialize = busname_serialize, |
| .deserialize_item = busname_deserialize_item, |
| |
| .active_state = busname_active_state, |
| .sub_state_to_string = busname_sub_state_to_string, |
| |
| .sigchld_event = busname_sigchld_event, |
| |
| .trigger_notify = busname_trigger_notify, |
| |
| .reset_failed = busname_reset_failed, |
| |
| .supported = busname_supported, |
| |
| .bus_vtable = bus_busname_vtable, |
| |
| .status_message_formats = { |
| .finished_start_job = { |
| [JOB_DONE] = "Listening on %s.", |
| [JOB_FAILED] = "Failed to listen on %s.", |
| }, |
| .finished_stop_job = { |
| [JOB_DONE] = "Closed %s.", |
| [JOB_FAILED] = "Failed stopping %s.", |
| }, |
| }, |
| }; |