1064 lines
31 KiB
C
1064 lines
31 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2013 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <sys/mman.h>
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#include "bus-internal.h"
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#include "bus-kernel.h"
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#include "bus-policy.h"
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#include "bus-util.h"
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#include "busname.h"
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#include "dbus-busname.h"
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#include "fd-util.h"
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#include "formats-util.h"
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#include "kdbus.h"
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#include "parse-util.h"
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#include "service.h"
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#include "signal-util.h"
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#include "special.h"
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#include "string-util.h"
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static const UnitActiveState state_translation_table[_BUSNAME_STATE_MAX] = {
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[BUSNAME_DEAD] = UNIT_INACTIVE,
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[BUSNAME_MAKING] = UNIT_ACTIVATING,
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[BUSNAME_REGISTERED] = UNIT_ACTIVE,
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[BUSNAME_LISTENING] = UNIT_ACTIVE,
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[BUSNAME_RUNNING] = UNIT_ACTIVE,
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[BUSNAME_SIGTERM] = UNIT_DEACTIVATING,
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[BUSNAME_SIGKILL] = UNIT_DEACTIVATING,
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[BUSNAME_FAILED] = UNIT_FAILED
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};
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static int busname_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata);
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static int busname_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata);
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static void busname_init(Unit *u) {
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BusName *n = BUSNAME(u);
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assert(u);
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assert(u->load_state == UNIT_STUB);
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n->starter_fd = -1;
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n->accept_fd = true;
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n->activating = true;
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n->timeout_usec = u->manager->default_timeout_start_usec;
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}
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static void busname_unwatch_control_pid(BusName *n) {
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assert(n);
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if (n->control_pid <= 0)
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return;
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unit_unwatch_pid(UNIT(n), n->control_pid);
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n->control_pid = 0;
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}
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static void busname_free_policy(BusName *n) {
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BusNamePolicy *p;
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assert(n);
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while ((p = n->policy)) {
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LIST_REMOVE(policy, n->policy, p);
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free(p->name);
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free(p);
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}
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}
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static void busname_close_fd(BusName *n) {
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assert(n);
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n->starter_event_source = sd_event_source_unref(n->starter_event_source);
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n->starter_fd = safe_close(n->starter_fd);
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}
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static void busname_done(Unit *u) {
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BusName *n = BUSNAME(u);
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assert(n);
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n->name = mfree(n->name);
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busname_free_policy(n);
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busname_unwatch_control_pid(n);
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busname_close_fd(n);
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unit_ref_unset(&n->service);
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n->timer_event_source = sd_event_source_unref(n->timer_event_source);
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}
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static int busname_arm_timer(BusName *n) {
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int r;
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assert(n);
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if (n->timeout_usec <= 0) {
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n->timer_event_source = sd_event_source_unref(n->timer_event_source);
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return 0;
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}
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if (n->timer_event_source) {
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r = sd_event_source_set_time(n->timer_event_source, now(CLOCK_MONOTONIC) + n->timeout_usec);
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if (r < 0)
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return r;
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return sd_event_source_set_enabled(n->timer_event_source, SD_EVENT_ONESHOT);
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}
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r = sd_event_add_time(
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UNIT(n)->manager->event,
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&n->timer_event_source,
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CLOCK_MONOTONIC,
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now(CLOCK_MONOTONIC) + n->timeout_usec, 0,
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busname_dispatch_timer, n);
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if (r < 0)
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return r;
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(void) sd_event_source_set_description(n->timer_event_source, "busname-timer");
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return 0;
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}
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static int busname_add_default_default_dependencies(BusName *n) {
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int r;
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assert(n);
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r = unit_add_dependency_by_name(UNIT(n), UNIT_BEFORE, SPECIAL_BUSNAMES_TARGET, NULL, true);
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if (r < 0)
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return r;
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if (UNIT(n)->manager->running_as == MANAGER_SYSTEM) {
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r = unit_add_two_dependencies_by_name(UNIT(n), UNIT_AFTER, UNIT_REQUIRES, SPECIAL_SYSINIT_TARGET, NULL, true);
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if (r < 0)
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return r;
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}
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return unit_add_two_dependencies_by_name(UNIT(n), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_SHUTDOWN_TARGET, NULL, true);
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}
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static int busname_add_extras(BusName *n) {
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Unit *u = UNIT(n);
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int r;
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assert(n);
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if (!n->name) {
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r = unit_name_to_prefix(u->id, &n->name);
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if (r < 0)
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return r;
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}
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if (!u->description) {
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r = unit_set_description(u, n->name);
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if (r < 0)
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return r;
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}
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if (n->activating) {
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if (!UNIT_DEREF(n->service)) {
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Unit *x;
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r = unit_load_related_unit(u, ".service", &x);
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if (r < 0)
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return r;
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unit_ref_set(&n->service, x);
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}
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r = unit_add_two_dependencies(u, UNIT_BEFORE, UNIT_TRIGGERS, UNIT_DEREF(n->service), true);
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if (r < 0)
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return r;
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}
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if (u->default_dependencies) {
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r = busname_add_default_default_dependencies(n);
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if (r < 0)
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return r;
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}
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return 0;
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}
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static int busname_verify(BusName *n) {
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char *e;
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assert(n);
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if (UNIT(n)->load_state != UNIT_LOADED)
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return 0;
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if (!service_name_is_valid(n->name)) {
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log_unit_error(UNIT(n), "Name= setting is not a valid service name Refusing.");
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return -EINVAL;
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}
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e = strjoina(n->name, ".busname");
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if (!unit_has_name(UNIT(n), e)) {
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log_unit_error(UNIT(n), "Name= setting doesn't match unit name. Refusing.");
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return -EINVAL;
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}
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return 0;
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}
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static int busname_load(Unit *u) {
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BusName *n = BUSNAME(u);
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int r;
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assert(u);
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assert(u->load_state == UNIT_STUB);
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r = unit_load_fragment_and_dropin(u);
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if (r < 0)
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return r;
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if (u->load_state == UNIT_LOADED) {
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/* This is a new unit? Then let's add in some extras */
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r = busname_add_extras(n);
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if (r < 0)
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return r;
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}
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return busname_verify(n);
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}
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static void busname_dump(Unit *u, FILE *f, const char *prefix) {
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BusName *n = BUSNAME(u);
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assert(n);
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assert(f);
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fprintf(f,
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"%sBus Name State: %s\n"
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"%sResult: %s\n"
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"%sName: %s\n"
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"%sActivating: %s\n"
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"%sAccept FD: %s\n",
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prefix, busname_state_to_string(n->state),
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prefix, busname_result_to_string(n->result),
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prefix, n->name,
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prefix, yes_no(n->activating),
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prefix, yes_no(n->accept_fd));
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if (n->control_pid > 0)
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fprintf(f,
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"%sControl PID: "PID_FMT"\n",
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prefix, n->control_pid);
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}
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static void busname_unwatch_fd(BusName *n) {
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int r;
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assert(n);
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if (!n->starter_event_source)
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return;
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r = sd_event_source_set_enabled(n->starter_event_source, SD_EVENT_OFF);
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if (r < 0)
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log_unit_debug_errno(UNIT(n), r, "Failed to disable event source: %m");
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}
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static int busname_watch_fd(BusName *n) {
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int r;
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assert(n);
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if (n->starter_fd < 0)
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return 0;
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if (n->starter_event_source) {
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r = sd_event_source_set_enabled(n->starter_event_source, SD_EVENT_ON);
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if (r < 0)
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goto fail;
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} else {
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r = sd_event_add_io(UNIT(n)->manager->event, &n->starter_event_source, n->starter_fd, EPOLLIN, busname_dispatch_io, n);
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if (r < 0)
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goto fail;
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(void) sd_event_source_set_description(n->starter_event_source, "busname-starter");
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}
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return 0;
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fail:
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log_unit_warning_errno(UNIT(n), r, "Failed to watch starter fd: %m");
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busname_unwatch_fd(n);
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return r;
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}
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static int busname_open_fd(BusName *n) {
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_cleanup_free_ char *path = NULL;
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const char *mode;
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assert(n);
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if (n->starter_fd >= 0)
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return 0;
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mode = UNIT(n)->manager->running_as == MANAGER_SYSTEM ? "system" : "user";
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n->starter_fd = bus_kernel_open_bus_fd(mode, &path);
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if (n->starter_fd < 0)
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return log_unit_warning_errno(UNIT(n), n->starter_fd, "Failed to open %s: %m", path ?: "kdbus");
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return 0;
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}
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static void busname_set_state(BusName *n, BusNameState state) {
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BusNameState old_state;
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assert(n);
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old_state = n->state;
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n->state = state;
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if (!IN_SET(state, BUSNAME_MAKING, BUSNAME_SIGTERM, BUSNAME_SIGKILL)) {
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n->timer_event_source = sd_event_source_unref(n->timer_event_source);
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busname_unwatch_control_pid(n);
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}
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if (state != BUSNAME_LISTENING)
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busname_unwatch_fd(n);
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if (!IN_SET(state, BUSNAME_LISTENING, BUSNAME_MAKING, BUSNAME_REGISTERED, BUSNAME_RUNNING))
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busname_close_fd(n);
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if (state != old_state)
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log_unit_debug(UNIT(n), "Changed %s -> %s", busname_state_to_string(old_state), busname_state_to_string(state));
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unit_notify(UNIT(n), state_translation_table[old_state], state_translation_table[state], true);
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}
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static int busname_coldplug(Unit *u) {
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BusName *n = BUSNAME(u);
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int r;
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assert(n);
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assert(n->state == BUSNAME_DEAD);
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if (n->deserialized_state == n->state)
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return 0;
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if (IN_SET(n->deserialized_state, BUSNAME_MAKING, BUSNAME_SIGTERM, BUSNAME_SIGKILL)) {
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if (n->control_pid <= 0)
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return -EBADMSG;
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r = unit_watch_pid(UNIT(n), n->control_pid);
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if (r < 0)
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return r;
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r = busname_arm_timer(n);
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if (r < 0)
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return r;
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}
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if (IN_SET(n->deserialized_state, BUSNAME_MAKING, BUSNAME_LISTENING, BUSNAME_REGISTERED, BUSNAME_RUNNING)) {
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r = busname_open_fd(n);
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if (r < 0)
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return r;
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}
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if (n->deserialized_state == BUSNAME_LISTENING) {
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r = busname_watch_fd(n);
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if (r < 0)
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return r;
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}
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busname_set_state(n, n->deserialized_state);
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return 0;
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}
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static int busname_make_starter(BusName *n, pid_t *_pid) {
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pid_t pid;
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int r;
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r = busname_arm_timer(n);
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if (r < 0)
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goto fail;
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/* We have to resolve the user/group names out-of-process,
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* hence let's fork here. It's messy, but well, what can we
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* do? */
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pid = fork();
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if (pid < 0)
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return -errno;
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if (pid == 0) {
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int ret;
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(void) default_signals(SIGNALS_CRASH_HANDLER, SIGNALS_IGNORE, -1);
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(void) ignore_signals(SIGPIPE, -1);
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log_forget_fds();
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r = bus_kernel_make_starter(n->starter_fd, n->name, n->activating, n->accept_fd, n->policy, n->policy_world);
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if (r < 0) {
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ret = EXIT_MAKE_STARTER;
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goto fail_child;
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}
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_exit(0);
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fail_child:
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log_open();
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log_error_errno(r, "Failed to create starter connection at step %s: %m", exit_status_to_string(ret, EXIT_STATUS_SYSTEMD));
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_exit(ret);
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}
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r = unit_watch_pid(UNIT(n), pid);
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if (r < 0)
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goto fail;
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*_pid = pid;
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return 0;
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|
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fail:
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n->timer_event_source = sd_event_source_unref(n->timer_event_source);
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return r;
|
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}
|
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|
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static void busname_enter_dead(BusName *n, BusNameResult f) {
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assert(n);
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|
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if (f != BUSNAME_SUCCESS)
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n->result = f;
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|
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busname_set_state(n, n->result != BUSNAME_SUCCESS ? BUSNAME_FAILED : BUSNAME_DEAD);
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}
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|
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static void busname_enter_signal(BusName *n, BusNameState state, BusNameResult f) {
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KillContext kill_context = {};
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int r;
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assert(n);
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|
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if (f != BUSNAME_SUCCESS)
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n->result = f;
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|
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kill_context_init(&kill_context);
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|
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r = unit_kill_context(UNIT(n),
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&kill_context,
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state != BUSNAME_SIGTERM ? KILL_KILL : KILL_TERMINATE,
|
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-1,
|
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n->control_pid,
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false);
|
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if (r < 0) {
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log_unit_warning_errno(UNIT(n), r, "Failed to kill control process: %m");
|
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goto fail;
|
|
}
|
|
|
|
if (r > 0) {
|
|
r = busname_arm_timer(n);
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if (r < 0) {
|
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log_unit_warning_errno(UNIT(n), r, "Failed to arm timer: %m");
|
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goto fail;
|
|
}
|
|
|
|
busname_set_state(n, state);
|
|
} else if (state == BUSNAME_SIGTERM)
|
|
busname_enter_signal(n, BUSNAME_SIGKILL, BUSNAME_SUCCESS);
|
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else
|
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busname_enter_dead(n, BUSNAME_SUCCESS);
|
|
|
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return;
|
|
|
|
fail:
|
|
busname_enter_dead(n, BUSNAME_FAILURE_RESOURCES);
|
|
}
|
|
|
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static void busname_enter_listening(BusName *n) {
|
|
int r;
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|
|
|
assert(n);
|
|
|
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if (n->activating) {
|
|
r = busname_watch_fd(n);
|
|
if (r < 0) {
|
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log_unit_warning_errno(UNIT(n), r, "Failed to watch names: %m");
|
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goto fail;
|
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}
|
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|
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busname_set_state(n, BUSNAME_LISTENING);
|
|
} else
|
|
busname_set_state(n, BUSNAME_REGISTERED);
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|
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return;
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|
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fail:
|
|
busname_enter_signal(n, BUSNAME_SIGTERM, BUSNAME_FAILURE_RESOURCES);
|
|
}
|
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|
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static void busname_enter_making(BusName *n) {
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int r;
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|
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assert(n);
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|
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r = busname_open_fd(n);
|
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if (r < 0)
|
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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);
|
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|
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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) {
|
|
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, 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);
|
|
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);
|
|
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_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.",
|
|
},
|
|
},
|
|
};
|