diff options
Diffstat (limited to 'src/core/service.c')
| -rw-r--r-- | src/core/service.c | 284 |
1 files changed, 181 insertions, 103 deletions
diff --git a/src/core/service.c b/src/core/service.c index afb198507b..a7274a758f 100644 --- a/src/core/service.c +++ b/src/core/service.c @@ -289,7 +289,17 @@ static void service_fd_store_unlink(ServiceFDStore *fs) { free(fs); } -static void service_release_resources(Unit *u) { +static void service_release_fd_store(Service *s) { + assert(s); + + log_unit_debug(UNIT(s), "Releasing all stored fds"); + while (s->fd_store) + service_fd_store_unlink(s->fd_store); + + assert(s->n_fd_store == 0); +} + +static void service_release_resources(Unit *u, bool inactive) { Service *s = SERVICE(u); assert(s); @@ -297,16 +307,14 @@ static void service_release_resources(Unit *u) { if (!s->fd_store && s->stdin_fd < 0 && s->stdout_fd < 0 && s->stderr_fd < 0) return; - log_unit_debug(u, "Releasing all resources."); + log_unit_debug(u, "Releasing resources."); s->stdin_fd = safe_close(s->stdin_fd); s->stdout_fd = safe_close(s->stdout_fd); s->stderr_fd = safe_close(s->stderr_fd); - while (s->fd_store) - service_fd_store_unlink(s->fd_store); - - assert(s->n_fd_store == 0); + if (inactive) + service_release_fd_store(s); } static void service_done(Unit *u) { @@ -322,6 +330,8 @@ static void service_done(Unit *u) { s->control_command = NULL; s->main_command = NULL; + dynamic_creds_unref(&s->dynamic_creds); + exit_status_set_free(&s->restart_prevent_status); exit_status_set_free(&s->restart_force_status); exit_status_set_free(&s->success_status); @@ -340,6 +350,7 @@ static void service_done(Unit *u) { s->bus_name_owner = mfree(s->bus_name_owner); service_close_socket_fd(s); + s->peer = socket_peer_unref(s->peer); unit_ref_unset(&s->accept_socket); @@ -347,7 +358,7 @@ static void service_done(Unit *u) { s->timer_event_source = sd_event_source_unref(s->timer_event_source); - service_release_resources(u); + service_release_resources(u, true); } static int on_fd_store_io(sd_event_source *e, int fd, uint32_t revents, void *userdata) { @@ -357,6 +368,10 @@ static int on_fd_store_io(sd_event_source *e, int fd, uint32_t revents, void *us assert(fs); /* If we get either EPOLLHUP or EPOLLERR, it's time to remove this entry from the fd store */ + log_unit_debug(UNIT(fs->service), + "Received %s on stored fd %d (%s), closing.", + revents & EPOLLERR ? "EPOLLERR" : "EPOLLHUP", + fs->fd, strna(fs->fdname)); service_fd_store_unlink(fs); return 0; } @@ -365,20 +380,23 @@ static int service_add_fd_store(Service *s, int fd, const char *name) { ServiceFDStore *fs; int r; + /* fd is always consumed if we return >= 0 */ + assert(s); assert(fd >= 0); if (s->n_fd_store >= s->n_fd_store_max) - return 0; + return -EXFULL; /* Our store is full. + * Use this errno rather than E[NM]FILE to distinguish from + * the case where systemd itself hits the file limit. */ LIST_FOREACH(fd_store, fs, s->fd_store) { r = same_fd(fs->fd, fd); if (r < 0) return r; if (r > 0) { - /* Already included */ safe_close(fd); - return 1; + return 0; /* fd already included */ } } @@ -406,7 +424,7 @@ static int service_add_fd_store(Service *s, int fd, const char *name) { LIST_PREPEND(fd_store, s->fd_store, fs); s->n_fd_store++; - return 1; + return 1; /* fd newly stored */ } static int service_add_fd_store_set(Service *s, FDSet *fds, const char *name) { @@ -414,10 +432,7 @@ static int service_add_fd_store_set(Service *s, FDSet *fds, const char *name) { assert(s); - if (fdset_size(fds) <= 0) - return 0; - - while (s->n_fd_store < s->n_fd_store_max) { + while (fdset_size(fds) > 0) { _cleanup_close_ int fd = -1; fd = fdset_steal_first(fds); @@ -425,17 +440,17 @@ static int service_add_fd_store_set(Service *s, FDSet *fds, const char *name) { break; r = service_add_fd_store(s, fd, name); + if (r == -EXFULL) + return log_unit_warning_errno(UNIT(s), r, + "Cannot store more fds than FileDescriptorStoreMax=%u, closing remaining.", + s->n_fd_store_max); if (r < 0) - return log_unit_error_errno(UNIT(s), r, "Couldn't add fd to fd store: %m"); - if (r > 0) { - log_unit_debug(UNIT(s), "Added fd to fd store."); - fd = -1; - } + return log_unit_error_errno(UNIT(s), r, "Failed to add fd to store: %m"); + if (r > 0) + log_unit_debug(UNIT(s), "Added fd %u (%s) to fd store.", fd, strna(name)); + fd = -1; } - if (fdset_size(fds) > 0) - log_unit_warning(UNIT(s), "Tried to store more fds than FileDescriptorStoreMax=%u allows, closing remaining.", s->n_fd_store_max); - return 0; } @@ -758,6 +773,11 @@ static void service_dump(Unit *u, FILE *f, const char *prefix) { prefix, s->bus_name, prefix, yes_no(s->bus_name_good)); + if (UNIT_ISSET(s->accept_socket)) + fprintf(f, + "%sAccept Socket: %s\n", + prefix, UNIT_DEREF(s->accept_socket)->id); + kill_context_dump(&s->kill_context, f, prefix); exec_context_dump(&s->exec_context, f, prefix); @@ -1030,6 +1050,23 @@ static int service_coldplug(Unit *u) { if (IN_SET(s->deserialized_state, SERVICE_START_POST, SERVICE_RUNNING, SERVICE_RELOAD)) service_start_watchdog(s); + if (!IN_SET(s->deserialized_state, SERVICE_DEAD, SERVICE_FAILED, SERVICE_AUTO_RESTART)) + (void) unit_setup_dynamic_creds(u); + + if (UNIT_ISSET(s->accept_socket)) { + Socket* socket = SOCKET(UNIT_DEREF(s->accept_socket)); + + if (socket->max_connections_per_source > 0) { + SocketPeer *peer; + + /* Make a best-effort attempt at bumping the connection count */ + if (socket_acquire_peer(socket, s->socket_fd, &peer) > 0) { + socket_peer_unref(s->peer); + s->peer = peer; + } + } + } + service_set_state(s, s->deserialized_state); return 0; } @@ -1146,11 +1183,7 @@ static int service_spawn( Service *s, ExecCommand *c, usec_t timeout, - bool pass_fds, - bool apply_permissions, - bool apply_chroot, - bool apply_tty_stdin, - bool is_control, + ExecFlags flags, pid_t *_pid) { _cleanup_strv_free_ char **argv = NULL, **final_env = NULL, **our_env = NULL, **fd_names = NULL; @@ -1160,12 +1193,10 @@ static int service_spawn( pid_t pid; ExecParameters exec_params = { - .apply_permissions = apply_permissions, - .apply_chroot = apply_chroot, - .apply_tty_stdin = apply_tty_stdin, - .stdin_fd = -1, - .stdout_fd = -1, - .stderr_fd = -1, + .flags = flags, + .stdin_fd = -1, + .stdout_fd = -1, + .stderr_fd = -1, }; int r; @@ -1174,6 +1205,14 @@ static int service_spawn( assert(c); assert(_pid); + if (flags & EXEC_IS_CONTROL) { + /* If this is a control process, mask the permissions/chroot application if this is requested. */ + if (s->permissions_start_only) + exec_params.flags &= ~EXEC_APPLY_PERMISSIONS; + if (s->root_directory_start_only) + exec_params.flags &= ~EXEC_APPLY_CHROOT; + } + (void) unit_realize_cgroup(UNIT(s)); if (s->reset_cpu_usage) { (void) unit_reset_cpu_usage(UNIT(s)); @@ -1184,7 +1223,11 @@ static int service_spawn( if (r < 0) return r; - if (pass_fds || + r = unit_setup_dynamic_creds(UNIT(s)); + if (r < 0) + return r; + + if ((flags & EXEC_PASS_FDS) || s->exec_context.std_input == EXEC_INPUT_SOCKET || s->exec_context.std_output == EXEC_OUTPUT_SOCKET || s->exec_context.std_error == EXEC_OUTPUT_SOCKET) { @@ -1194,6 +1237,7 @@ static int service_spawn( return r; n_fds = r; + log_unit_debug(UNIT(s), "Passing %i fds to service", n_fds); } r = service_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), timeout)); @@ -1204,11 +1248,11 @@ static int service_spawn( if (r < 0) return r; - our_env = new0(char*, 6); + our_env = new0(char*, 9); if (!our_env) return -ENOMEM; - if (is_control ? s->notify_access == NOTIFY_ALL : s->notify_access != NOTIFY_NONE) + if ((flags & EXEC_IS_CONTROL) ? s->notify_access == NOTIFY_ALL : s->notify_access != NOTIFY_NONE) if (asprintf(our_env + n_env++, "NOTIFY_SOCKET=%s", UNIT(s)->manager->notify_socket) < 0) return -ENOMEM; @@ -1216,7 +1260,7 @@ static int service_spawn( if (asprintf(our_env + n_env++, "MAINPID="PID_FMT, s->main_pid) < 0) return -ENOMEM; - if (!MANAGER_IS_SYSTEM(UNIT(s)->manager)) + if (MANAGER_IS_USER(UNIT(s)->manager)) if (asprintf(our_env + n_env++, "MANAGERPID="PID_FMT, getpid()) < 0) return -ENOMEM; @@ -1225,10 +1269,16 @@ static int service_spawn( socklen_t salen = sizeof(sa); r = getpeername(s->socket_fd, &sa.sa, &salen); - if (r < 0) - return -errno; + if (r < 0) { + r = -errno; - if (IN_SET(sa.sa.sa_family, AF_INET, AF_INET6)) { + /* ENOTCONN is legitimate if the endpoint disappeared on shutdown. + * This connection is over, but the socket unit lives on. */ + if (r != -ENOTCONN || !IN_SET(s->control_command_id, SERVICE_EXEC_STOP, SERVICE_EXEC_STOP_POST)) + return r; + } + + if (r == 0 && IN_SET(sa.sa.sa_family, AF_INET, AF_INET6)) { _cleanup_free_ char *addr = NULL; char *t; int port; @@ -1252,22 +1302,40 @@ static int service_spawn( } } + if (flags & EXEC_SETENV_RESULT) { + if (asprintf(our_env + n_env++, "SERVICE_RESULT=%s", service_result_to_string(s->result)) < 0) + return -ENOMEM; + + if (s->main_exec_status.pid > 0 && + dual_timestamp_is_set(&s->main_exec_status.exit_timestamp)) { + if (asprintf(our_env + n_env++, "EXIT_CODE=%s", sigchld_code_to_string(s->main_exec_status.code)) < 0) + return -ENOMEM; + + if (s->main_exec_status.code == CLD_EXITED) + r = asprintf(our_env + n_env++, "EXIT_STATUS=%i", s->main_exec_status.status); + else + r = asprintf(our_env + n_env++, "EXIT_STATUS=%s", signal_to_string(s->main_exec_status.status)); + if (r < 0) + return -ENOMEM; + } + } + final_env = strv_env_merge(2, UNIT(s)->manager->environment, our_env, NULL); if (!final_env) return -ENOMEM; - if (is_control && UNIT(s)->cgroup_path) { + if ((flags & EXEC_IS_CONTROL) && UNIT(s)->cgroup_path) { path = strjoina(UNIT(s)->cgroup_path, "/control"); (void) cg_create(SYSTEMD_CGROUP_CONTROLLER, path); } else path = UNIT(s)->cgroup_path; exec_params.argv = argv; + exec_params.environment = final_env; exec_params.fds = fds; exec_params.fd_names = fd_names; exec_params.n_fds = n_fds; - exec_params.environment = final_env; - exec_params.confirm_spawn = UNIT(s)->manager->confirm_spawn; + exec_params.flags |= UNIT(s)->manager->confirm_spawn ? EXEC_CONFIRM_SPAWN : 0; exec_params.cgroup_supported = UNIT(s)->manager->cgroup_supported; exec_params.cgroup_path = path; exec_params.cgroup_delegate = s->cgroup_context.delegate; @@ -1285,6 +1353,7 @@ static int service_spawn( &s->exec_context, &exec_params, s->exec_runtime, + &s->dynamic_creds, &pid); if (r < 0) return r; @@ -1392,14 +1461,14 @@ static void service_enter_dead(Service *s, ServiceResult f, bool allow_restart) int r; assert(s); - if (f != SERVICE_SUCCESS) + if (s->result == SERVICE_SUCCESS) s->result = f; service_set_state(s, s->result != SERVICE_SUCCESS ? SERVICE_FAILED : SERVICE_DEAD); if (s->result != SERVICE_SUCCESS) { log_unit_warning(UNIT(s), "Failed with result '%s'.", service_result_to_string(s->result)); - failure_action(UNIT(s)->manager, s->failure_action, UNIT(s)->reboot_arg); + emergency_action(UNIT(s)->manager, s->emergency_action, UNIT(s)->reboot_arg, "service failed"); } if (allow_restart && service_shall_restart(s)) { @@ -1418,9 +1487,15 @@ static void service_enter_dead(Service *s, ServiceResult f, bool allow_restart) exec_runtime_destroy(s->exec_runtime); s->exec_runtime = exec_runtime_unref(s->exec_runtime); - /* Also, remove the runtime directory in */ + /* Also, remove the runtime directory */ exec_context_destroy_runtime_directory(&s->exec_context, manager_get_runtime_prefix(UNIT(s)->manager)); + /* Get rid of the IPC bits of the user */ + unit_unref_uid_gid(UNIT(s), true); + + /* Release the user, and destroy it if we are the only remaining owner */ + dynamic_creds_destroy(&s->dynamic_creds); + /* Try to delete the pid file. At this point it will be * out-of-date, and some software might be confused by it, so * let's remove it. */ @@ -1438,7 +1513,7 @@ static void service_enter_stop_post(Service *s, ServiceResult f) { int r; assert(s); - if (f != SERVICE_SUCCESS) + if (s->result == SERVICE_SUCCESS) s->result = f; service_unwatch_control_pid(s); @@ -1451,11 +1526,7 @@ static void service_enter_stop_post(Service *s, ServiceResult f) { r = service_spawn(s, s->control_command, s->timeout_stop_usec, - false, - !s->permissions_start_only, - !s->root_directory_start_only, - true, - true, + EXEC_APPLY_PERMISSIONS|EXEC_APPLY_CHROOT|EXEC_APPLY_TTY_STDIN|EXEC_IS_CONTROL|EXEC_SETENV_RESULT, &s->control_pid); if (r < 0) goto fail; @@ -1495,7 +1566,7 @@ static void service_enter_signal(Service *s, ServiceState state, ServiceResult f assert(s); - if (f != SERVICE_SUCCESS) + if (s->result == SERVICE_SUCCESS) s->result = f; unit_watch_all_pids(UNIT(s)); @@ -1553,7 +1624,7 @@ static void service_enter_stop(Service *s, ServiceResult f) { assert(s); - if (f != SERVICE_SUCCESS) + if (s->result == SERVICE_SUCCESS) s->result = f; service_unwatch_control_pid(s); @@ -1566,11 +1637,7 @@ static void service_enter_stop(Service *s, ServiceResult f) { r = service_spawn(s, s->control_command, s->timeout_stop_usec, - false, - !s->permissions_start_only, - !s->root_directory_start_only, - false, - true, + EXEC_APPLY_PERMISSIONS|EXEC_APPLY_CHROOT|EXEC_IS_CONTROL|EXEC_SETENV_RESULT, &s->control_pid); if (r < 0) goto fail; @@ -1609,7 +1676,7 @@ static bool service_good(Service *s) { static void service_enter_running(Service *s, ServiceResult f) { assert(s); - if (f != SERVICE_SUCCESS) + if (s->result == SERVICE_SUCCESS) s->result = f; service_unwatch_control_pid(s); @@ -1647,11 +1714,7 @@ static void service_enter_start_post(Service *s) { r = service_spawn(s, s->control_command, s->timeout_start_usec, - false, - !s->permissions_start_only, - !s->root_directory_start_only, - false, - true, + EXEC_APPLY_PERMISSIONS|EXEC_APPLY_CHROOT|EXEC_IS_CONTROL, &s->control_pid); if (r < 0) goto fail; @@ -1706,7 +1769,15 @@ static void service_enter_start(Service *s) { } if (!c) { - assert(s->type == SERVICE_ONESHOT); + if (s->type != SERVICE_ONESHOT) { + /* There's no command line configured for the main command? Hmm, that is strange. This can only + * happen if the configuration changes at runtime. In this case, let's enter a failure + * state. */ + log_unit_error(UNIT(s), "There's no 'start' task anymore we could start: %m"); + r = -ENXIO; + goto fail; + } + service_enter_start_post(s); return; } @@ -1721,11 +1792,7 @@ static void service_enter_start(Service *s) { r = service_spawn(s, c, timeout, - true, - true, - true, - true, - false, + EXEC_PASS_FDS|EXEC_APPLY_PERMISSIONS|EXEC_APPLY_CHROOT|EXEC_APPLY_TTY_STDIN|EXEC_SET_WATCHDOG, &pid); if (r < 0) goto fail; @@ -1784,11 +1851,7 @@ static void service_enter_start_pre(Service *s) { r = service_spawn(s, s->control_command, s->timeout_start_usec, - false, - !s->permissions_start_only, - !s->root_directory_start_only, - true, - true, + EXEC_APPLY_PERMISSIONS|EXEC_APPLY_CHROOT|EXEC_IS_CONTROL|EXEC_APPLY_TTY_STDIN, &s->control_pid); if (r < 0) goto fail; @@ -1863,11 +1926,7 @@ static void service_enter_reload(Service *s) { r = service_spawn(s, s->control_command, s->timeout_start_usec, - false, - !s->permissions_start_only, - !s->root_directory_start_only, - false, - true, + EXEC_APPLY_PERMISSIONS|EXEC_APPLY_CHROOT|EXEC_IS_CONTROL, &s->control_pid); if (r < 0) goto fail; @@ -1905,12 +1964,9 @@ static void service_run_next_control(Service *s) { r = service_spawn(s, s->control_command, timeout, - false, - !s->permissions_start_only, - !s->root_directory_start_only, - s->control_command_id == SERVICE_EXEC_START_PRE || - s->control_command_id == SERVICE_EXEC_STOP_POST, - true, + EXEC_APPLY_PERMISSIONS|EXEC_APPLY_CHROOT|EXEC_IS_CONTROL| + (IN_SET(s->control_command_id, SERVICE_EXEC_START_PRE, SERVICE_EXEC_STOP_POST) ? EXEC_APPLY_TTY_STDIN : 0)| + (IN_SET(s->control_command_id, SERVICE_EXEC_STOP, SERVICE_EXEC_STOP_POST) ? EXEC_SETENV_RESULT : 0), &s->control_pid); if (r < 0) goto fail; @@ -1948,11 +2004,7 @@ static void service_run_next_main(Service *s) { r = service_spawn(s, s->main_command, s->timeout_start_usec, - true, - true, - true, - true, - false, + EXEC_PASS_FDS|EXEC_APPLY_PERMISSIONS|EXEC_APPLY_CHROOT|EXEC_APPLY_TTY_STDIN|EXEC_SET_WATCHDOG, &pid); if (r < 0) goto fail; @@ -2002,6 +2054,10 @@ static int service_start(Unit *u) { return r; } + r = unit_acquire_invocation_id(u); + if (r < 0) + return r; + s->result = SERVICE_SUCCESS; s->reload_result = SERVICE_SUCCESS; s->main_pid_known = false; @@ -2116,6 +2172,12 @@ static int service_serialize(Unit *u, FILE *f, FDSet *fds) { if (r < 0) return r; + if (UNIT_ISSET(s->accept_socket)) { + r = unit_serialize_item(u, f, "accept-socket", UNIT_DEREF(s->accept_socket)->id); + if (r < 0) + return r; + } + r = unit_serialize_item_fd(u, f, fds, "socket-fd", s->socket_fd); if (r < 0) return r; @@ -2246,6 +2308,17 @@ static int service_deserialize_item(Unit *u, const char *key, const char *value, s->control_command_id = id; s->control_command = s->exec_command[id]; } + } else if (streq(key, "accept-socket")) { + Unit *socket; + + r = manager_load_unit(u->manager, value, NULL, NULL, &socket); + if (r < 0) + log_unit_debug_errno(u, r, "Failed to load accept-socket unit: %s", value); + else { + unit_ref_set(&s->accept_socket, socket); + SOCKET(socket)->n_connections++; + } + } else if (streq(key, "socket-fd")) { int fd; @@ -2276,7 +2349,7 @@ static int service_deserialize_item(Unit *u, const char *key, const char *value, r = service_add_fd_store(s, fd, t); if (r < 0) log_unit_error_errno(u, r, "Failed to add fd to store: %m"); - else if (r > 0) + else fdset_remove(fds, fd); } @@ -2552,8 +2625,7 @@ static void service_sigchld_event(Unit *u, pid_t pid, int code, int status) { assert(s); assert(pid >= 0); - if (UNIT(s)->fragment_path ? is_clean_exit(code, status, &s->success_status) : - is_clean_exit_lsb(code, status, &s->success_status)) + if (is_clean_exit(code, status, s->type == SERVICE_ONESHOT ? EXIT_CLEAN_COMMAND : EXIT_CLEAN_DAEMON, &s->success_status)) f = SERVICE_SUCCESS; else if (code == CLD_EXITED) f = SERVICE_FAILURE_EXIT_CODE; @@ -2595,7 +2667,14 @@ static void service_sigchld_event(Unit *u, pid_t pid, int code, int status) { f = SERVICE_SUCCESS; } - log_struct(f == SERVICE_SUCCESS ? LOG_DEBUG : LOG_NOTICE, + /* When this is a successful exit, let's log about the exit code on DEBUG level. If this is a failure + * and the process exited on its own via exit(), then let's make this a NOTICE, under the assumption + * that the service already logged the reason at a higher log level on its own. However, if the service + * died due to a signal, then it most likely didn't say anything about any reason, hence let's raise + * our log level to WARNING then. */ + + log_struct(f == SERVICE_SUCCESS ? LOG_DEBUG : + (code == CLD_EXITED ? LOG_NOTICE : LOG_WARNING), LOG_UNIT_ID(u), LOG_UNIT_MESSAGE(u, "Main process exited, code=%s, status=%i/%s", sigchld_code_to_string(code), status, @@ -2606,7 +2685,7 @@ static void service_sigchld_event(Unit *u, pid_t pid, int code, int status) { "EXIT_STATUS=%i", status, NULL); - if (f != SERVICE_SUCCESS) + if (s->result == SERVICE_SUCCESS) s->result = f; if (s->main_command && @@ -2687,7 +2766,7 @@ static void service_sigchld_event(Unit *u, pid_t pid, int code, int status) { "Control process exited, code=%s status=%i", sigchld_code_to_string(code), status); - if (f != SERVICE_SUCCESS) + if (s->result == SERVICE_SUCCESS) s->result = f; /* Immediately get rid of the cgroup, so that the @@ -2827,7 +2906,7 @@ static void service_sigchld_event(Unit *u, pid_t pid, int code, int status) { /* If the PID set is empty now, then let's finish this off (On unified we use proper notifications) */ - if (cg_unified() <= 0 && set_isempty(u->pids)) + if (cg_unified(SYSTEMD_CGROUP_CONTROLLER) <= 0 && set_isempty(u->pids)) service_notify_cgroup_empty_event(u); } @@ -3037,9 +3116,7 @@ static void service_notify_message(Unit *u, pid_t pid, char **tags, FDSet *fds) if (!streq_ptr(s->status_text, t)) { - free(s->status_text); - s->status_text = t; - t = NULL; + free_and_replace(s->status_text, t); notify_dbus = true; } @@ -3323,6 +3400,7 @@ const UnitVTable service_vtable = { .cgroup_context_offset = offsetof(Service, cgroup_context), .kill_context_offset = offsetof(Service, kill_context), .exec_runtime_offset = offsetof(Service, exec_runtime), + .dynamic_creds_offset = offsetof(Service, dynamic_creds), .sections = "Unit\0" |