diff options
Diffstat (limited to 'src/libcore/busname.c')
| -rw-r--r-- | src/libcore/busname.c | 1082 |
1 files changed, 1082 insertions, 0 deletions
diff --git a/src/libcore/busname.c b/src/libcore/busname.c new file mode 100644 index 0000000000..f03a95c24e --- /dev/null +++ b/src/libcore/busname.c @@ -0,0 +1,1082 @@ +/*** + 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 "alloc-util.h" +#include "bus-internal.h" +#include "bus-kernel.h" +#include "bus-policy.h" +#include "bus-util.h" +#include "busname.h" +#include "dbus-busname.h" +#include "fd-util.h" +#include "formats-util.h" +#include "kdbus.h" +#include "parse-util.h" +#include "process-util.h" +#include "service.h" +#include "signal-util.h" +#include "special.h" +#include "string-table.h" +#include "string-util.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); + + n->name = mfree(n->name); + + 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, usec_t usec) { + int r; + + assert(n); + + if (n->timer_event_source) { + r = sd_event_source_set_time(n->timer_event_source, usec); + if (r < 0) + return r; + + return sd_event_source_set_enabled(n->timer_event_source, SD_EVENT_ONESHOT); + } + + if (usec == USEC_INFINITY) + return 0; + + r = sd_event_add_time( + UNIT(n)->manager->event, + &n->timer_event_source, + CLOCK_MONOTONIC, + 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 (MANAGER_IS_SYSTEM(UNIT(n)->manager)) { + 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 = MANAGER_IS_SYSTEM(UNIT(n)->manager) ? "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 (n->control_pid > 0 && + pid_is_unwaited(n->control_pid) && + IN_SET(n->deserialized_state, BUSNAME_MAKING, BUSNAME_SIGTERM, BUSNAME_SIGKILL)) { + + r = unit_watch_pid(UNIT(n), n->control_pid); + if (r < 0) + return r; + + r = busname_arm_timer(n, usec_add(u->state_change_timestamp.monotonic, n->timeout_usec)); + 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, usec_add(now(CLOCK_MONOTONIC), n->timeout_usec)); + 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, usec_add(now(CLOCK_MONOTONIC), n->timeout_usec)); + 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_(sd_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) { + if (!UNIT_ISSET(n->service)) { + log_unit_error(UNIT(n), "Service to activate vanished, refusing activation."); + r = -ENOENT; + goto fail; + } + + r = manager_add_job(UNIT(n)->manager, JOB_START, UNIT_DEREF(n->service), JOB_REPLACE, &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); + int r; + + 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)); + + r = unit_start_limit_test(u); + if (r < 0) { + busname_enter_dead(n, BUSNAME_FAILURE_START_LIMIT_HIT); + return r; + } + + 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); + int r; + + 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); + + r = unit_serialize_item_fd(u, f, fds, "starter-fd", n->starter_fd); + if (r < 0) + return r; + + 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); + + assert(n); + assert(other); + + if (!IN_SET(n->state, BUSNAME_RUNNING, BUSNAME_LISTENING)) + return; + + if (other->start_limit_hit) { + busname_enter_dead(n, BUSNAME_FAILURE_SERVICE_START_LIMIT_HIT); + return; + } + + if (other->load_state != UNIT_LOADED || other->type != UNIT_SERVICE) + return; + + if (IN_SET(SERVICE(other)->state, + SERVICE_DEAD, SERVICE_FAILED, + SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL, + SERVICE_AUTO_RESTART)) + busname_enter_listening(n); + + if (SERVICE(other)->state == SERVICE_RUNNING) + busname_set_state(n, BUSNAME_RUNNING); +} + +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, usec_t *timeout) { + BusName *n = BUSNAME(u); + usec_t t; + int r; + + if (!n->timer_event_source) + return 0; + + r = sd_event_source_get_time(n->timer_event_source, &t); + if (r < 0) + return r; + if (t == USEC_INFINITY) + return 0; + + *timeout = t; + return 1; +} + +static bool busname_supported(void) { + static int supported = -1; + + if (supported < 0) + supported = is_kdbus_available(); + + return supported; +} + +static int busname_control_pid(Unit *u) { + BusName *n = BUSNAME(u); + + assert(n); + + return n->control_pid; +} + +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_START_LIMIT_HIT] = "start-limit-hit", + [BUSNAME_FAILURE_SERVICE_START_LIMIT_HIT] = "service-start-limit-hit", +}; + +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", + + .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, + + .control_pid = busname_control_pid, + + .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.", + }, + }, +}; |