e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack#include <sys/mman.h>

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack#include "alloc-util.h"

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack#include "bus-internal.h"

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack#include "bus-kernel.h"

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack#include "bus-policy.h"

b1d4f8e154bf61b5de1b27461ef8e9c8c5e838a1Lennart Poettering#include "bus-util.h"

430f0182b72373145c839dbfe99d2382855cb8f8Lennart Poettering#include "busname.h"

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack#include "dbus-busname.h"

b1d4f8e154bf61b5de1b27461ef8e9c8c5e838a1Lennart Poettering#include "fd-util.h"

b1d4f8e154bf61b5de1b27461ef8e9c8c5e838a1Lennart Poettering#include "formats-util.h"

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack#include "kdbus.h"

b1d4f8e154bf61b5de1b27461ef8e9c8c5e838a1Lennart Poettering#include "parse-util.h"

b1d4f8e154bf61b5de1b27461ef8e9c8c5e838a1Lennart Poettering#include "process-util.h"

b1d4f8e154bf61b5de1b27461ef8e9c8c5e838a1Lennart Poettering#include "service.h"

b1d4f8e154bf61b5de1b27461ef8e9c8c5e838a1Lennart Poettering#include "signal-util.h"

b1d4f8e154bf61b5de1b27461ef8e9c8c5e838a1Lennart Poettering#include "special.h"

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack#include "string-table.h"

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack#include "string-util.h"

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mackstatic const UnitActiveState state_translation_table[_BUSNAME_STATE_MAX] = {

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack [BUSNAME_DEAD] = UNIT_INACTIVE,

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack [BUSNAME_MAKING] = UNIT_ACTIVATING,

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack [BUSNAME_REGISTERED] = UNIT_ACTIVE,

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack [BUSNAME_LISTENING] = UNIT_ACTIVE,

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack [BUSNAME_RUNNING] = UNIT_ACTIVE,

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack [BUSNAME_SIGTERM] = UNIT_DEACTIVATING,

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack [BUSNAME_SIGKILL] = UNIT_DEACTIVATING,

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack [BUSNAME_FAILED] = UNIT_FAILED

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack};

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mackstatic int busname_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata);

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mackstatic int busname_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata);

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mackstatic void busname_init(Unit *u) {

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack BusName *n = BUSNAME(u);

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack assert(u);

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack assert(u->load_state == UNIT_STUB);

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack n->starter_fd = -1;

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack n->accept_fd = true;

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack n->activating = true;

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack n->timeout_usec = u->manager->default_timeout_start_usec;

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack}

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mackstatic void busname_unwatch_control_pid(BusName *n) {

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack assert(n);

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack if (n->control_pid <= 0)

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack return;

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack unit_unwatch_pid(UNIT(n), n->control_pid);

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack n->control_pid = 0;

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack}

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mackstatic void busname_free_policy(BusName *n) {

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack BusNamePolicy *p;

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack assert(n);

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack while ((p = n->policy)) {

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack LIST_REMOVE(policy, n->policy, p);

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack free(p->name);

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack free(p);

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack }

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack}

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mackstatic void busname_close_fd(BusName *n) {

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack assert(n);

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack n->starter_event_source = sd_event_source_unref(n->starter_event_source);

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack n->starter_fd = safe_close(n->starter_fd);

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack}

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack

d02608170e599b1ffbc7c9a22062bae2579d6e36Lennart Poetteringstatic void busname_done(Unit *u) {

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack BusName *n = BUSNAME(u);

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack assert(n);

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack n->name = mfree(n->name);

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack busname_free_policy(n);

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack busname_unwatch_control_pid(n);

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack busname_close_fd(n);

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack unit_ref_unset(&n->service);

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack n->timer_event_source = sd_event_source_unref(n->timer_event_source);

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack}

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mackstatic int busname_arm_timer(BusName *n, usec_t usec) {

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack int r;

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack assert(n);

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack if (n->timer_event_source) {

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack r = sd_event_source_set_time(n->timer_event_source, usec);

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack if (r < 0)

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack return r;

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack return sd_event_source_set_enabled(n->timer_event_source, SD_EVENT_ONESHOT);

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack }

c2a23db0b91faca3795099fd4b41587bac170ff7Daniel Mack

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack if (usec == USEC_INFINITY)

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack return 0;

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack

c2a23db0b91faca3795099fd4b41587bac170ff7Daniel Mack r = sd_event_add_time(

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack UNIT(n)->manager->event,

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack &n->timer_event_source,

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack CLOCK_MONOTONIC,

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack usec, 0,

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack busname_dispatch_timer, n);

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack if (r < 0)

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack return r;

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack (void) sd_event_source_set_description(n->timer_event_source, "busname-timer");

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack return 0;

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack}

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mackstatic int busname_add_default_default_dependencies(BusName *n) {

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack int r;

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack assert(n);

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack r = unit_add_dependency_by_name(UNIT(n), UNIT_BEFORE, SPECIAL_BUSNAMES_TARGET, NULL, true);

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack if (r < 0)

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack return r;

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack if (UNIT(n)->manager->running_as == MANAGER_SYSTEM) {

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack r = unit_add_two_dependencies_by_name(UNIT(n), UNIT_AFTER, UNIT_REQUIRES, SPECIAL_SYSINIT_TARGET, NULL, true);

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack if (r < 0)

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack return r;

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack }

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack return unit_add_two_dependencies_by_name(UNIT(n), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_SHUTDOWN_TARGET, NULL, true);

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack}

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mackstatic int busname_add_extras(BusName *n) {

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack Unit *u = UNIT(n);

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack int r;

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack assert(n);

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack if (!n->name) {

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack r = unit_name_to_prefix(u->id, &n->name);

c2a23db0b91faca3795099fd4b41587bac170ff7Daniel Mack if (r < 0)

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack return r;

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack }

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack

c2a23db0b91faca3795099fd4b41587bac170ff7Daniel Mack if (!u->description) {

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack r = unit_set_description(u, n->name);

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack if (r < 0)

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack return r;

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack }

c2a23db0b91faca3795099fd4b41587bac170ff7Daniel Mack

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack if (n->activating) {

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack if (!UNIT_DEREF(n->service)) {

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack Unit *x;

e2fa5721c3ee5ea400b99a6463e8c1c257e20415Daniel Mack

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 (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,

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

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

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

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

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);

assert(n);

/* We cannot fulfill this request right now, try again later

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

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

assert(n);

/* Let's shortcut things a bit, if debug logging is turned off

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

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 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_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",

.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.",

},

},

};