X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=src%2Flogin%2Flogind-session.c;h=a72b13ee0363c3826836706c36c4f4dd64439c00;hp=b981e147c9d88e0002309dbaa92cd226f9b66962;hb=c506027af881a9e4210845a7a8a6ec5910aa0f3b;hpb=0762eaa3272b8c6d900737d610c9314c8610ef75 diff --git a/src/login/logind-session.c b/src/login/logind-session.c index b981e147c..a72b13ee0 100644 --- a/src/login/logind-session.c +++ b/src/login/logind-session.c @@ -20,25 +20,47 @@ ***/ #include +#include +#include +#include +#include #include +#include #include -#include -#include -#include "systemd/sd-id128.h" -#include "systemd/sd-messages.h" +#include "sd-id128.h" +#include "sd-messages.h" #include "strv.h" #include "util.h" #include "mkdir.h" #include "path-util.h" -#include "cgroup-util.h" +#include "fileio.h" +#include "audit.h" +#include "bus-util.h" +#include "bus-error.h" #include "logind-session.h" -Session* session_new(Manager *m, User *u, const char *id) { +static unsigned devt_hash_func(const void *p) { + uint64_t u = *(const dev_t*)p; + + return uint64_hash_func(&u); +} + +static int devt_compare_func(const void *_a, const void *_b) { + dev_t a, b; + + a = *(const dev_t*) _a; + b = *(const dev_t*) _b; + + return a < b ? -1 : (a > b ? 1 : 0); +} + +Session* session_new(Manager *m, const char *id) { Session *s; assert(m); assert(id); + assert(session_id_valid(id)); s = new0(Session, 1); if (!s) @@ -50,9 +72,17 @@ Session* session_new(Manager *m, User *u, const char *id) { return NULL; } + s->devices = hashmap_new(devt_hash_func, devt_compare_func); + if (!s->devices) { + free(s->state_file); + free(s); + return NULL; + } + s->id = path_get_file_name(s->state_file); if (hashmap_put(m->sessions, s->id, s) < 0) { + hashmap_free(s->devices); free(s->state_file); free(s); return NULL; @@ -60,21 +90,30 @@ Session* session_new(Manager *m, User *u, const char *id) { s->manager = m; s->fifo_fd = -1; - s->user = u; - - LIST_PREPEND(Session, sessions_by_user, u->sessions, s); + s->vtfd = -1; return s; } void session_free(Session *s) { + SessionDevice *sd; + assert(s); if (s->in_gc_queue) - LIST_REMOVE(Session, gc_queue, s->manager->session_gc_queue, s); + LIST_REMOVE(gc_queue, s->manager->session_gc_queue, s); + + session_remove_fifo(s); + + session_drop_controller(s); + + while ((sd = hashmap_first(s->devices))) + session_device_free(sd); + + hashmap_free(s->devices); if (s->user) { - LIST_REMOVE(Session, sessions_by_user, s->user->sessions, s); + LIST_REMOVE(sessions_by_user, s->user->sessions, s); if (s->user->display == s) s->user->display = NULL; @@ -83,15 +122,20 @@ void session_free(Session *s) { if (s->seat) { if (s->seat->active == s) s->seat->active = NULL; + if (s->seat->pending_switch == s) + s->seat->pending_switch = NULL; + + LIST_REMOVE(sessions_by_seat, s->seat->sessions, s); + } - LIST_REMOVE(Session, sessions_by_seat, s->seat->sessions, s); + if (s->scope) { + hashmap_remove(s->manager->session_units, s->scope); + free(s->scope); } - if (s->cgroup_path) - hashmap_remove(s->manager->session_cgroups, s->cgroup_path); + free(s->scope_job); - free(s->cgroup_path); - strv_free(s->controllers); + sd_bus_message_unref(s->create_message); free(s->tty); free(s->display); @@ -100,19 +144,29 @@ void session_free(Session *s) { free(s->service); hashmap_remove(s->manager->sessions, s->id); - session_remove_fifo(s); free(s->state_file); free(s); } +void session_set_user(Session *s, User *u) { + assert(s); + assert(!s->user); + + s->user = u; + LIST_PREPEND(sessions_by_user, u->sessions, s); +} + int session_save(Session *s) { - FILE *f; + _cleanup_free_ char *temp_path = NULL; + _cleanup_fclose_ FILE *f = NULL; int r = 0; - char *temp_path; assert(s); + if (!s->user) + return -ESTALE; + if (!s->started) return 0; @@ -134,79 +188,64 @@ int session_save(Session *s) { "USER=%s\n" "ACTIVE=%i\n" "STATE=%s\n" - "REMOTE=%i\n" - "KILL_PROCESSES=%i\n", + "REMOTE=%i\n", (unsigned long) s->user->uid, s->user->name, session_is_active(s), session_state_to_string(session_get_state(s)), - s->remote, - s->kill_processes); + s->remote); if (s->type >= 0) - fprintf(f, - "TYPE=%s\n", - session_type_to_string(s->type)); + fprintf(f, "TYPE=%s\n", session_type_to_string(s->type)); if (s->class >= 0) - fprintf(f, - "CLASS=%s\n", - session_class_to_string(s->class)); + fprintf(f, "CLASS=%s\n", session_class_to_string(s->class)); - if (s->cgroup_path) - fprintf(f, - "CGROUP=%s\n", - s->cgroup_path); + if (s->scope) + fprintf(f, "SCOPE=%s\n", s->scope); + + if (s->scope_job) + fprintf(f, "SCOPE_JOB=%s\n", s->scope_job); if (s->fifo_path) - fprintf(f, - "FIFO=%s\n", - s->fifo_path); + fprintf(f, "FIFO=%s\n", s->fifo_path); if (s->seat) - fprintf(f, - "SEAT=%s\n", - s->seat->id); + fprintf(f, "SEAT=%s\n", s->seat->id); if (s->tty) - fprintf(f, - "TTY=%s\n", - s->tty); + fprintf(f, "TTY=%s\n", s->tty); if (s->display) - fprintf(f, - "DISPLAY=%s\n", - s->display); + fprintf(f, "DISPLAY=%s\n", s->display); if (s->remote_host) - fprintf(f, - "REMOTE_HOST=%s\n", - s->remote_host); + fprintf(f, "REMOTE_HOST=%s\n", s->remote_host); if (s->remote_user) - fprintf(f, - "REMOTE_USER=%s\n", - s->remote_user); + fprintf(f, "REMOTE_USER=%s\n", s->remote_user); if (s->service) - fprintf(f, - "SERVICE=%s\n", - s->service); + fprintf(f, "SERVICE=%s\n", s->service); - if (s->seat && seat_can_multi_session(s->seat)) - fprintf(f, - "VTNR=%i\n", - s->vtnr); + if (s->seat && seat_has_vts(s->seat)) + fprintf(f, "VTNR=%u\n", s->vtnr); if (s->leader > 0) - fprintf(f, - "LEADER=%lu\n", - (unsigned long) s->leader); + fprintf(f, "LEADER=%lu\n", (unsigned long) s->leader); if (s->audit_id > 0) + fprintf(f, "AUDIT=%"PRIu32"\n", s->audit_id); + + if (dual_timestamp_is_set(&s->timestamp)) fprintf(f, - "AUDIT=%llu\n", - (unsigned long long) s->audit_id); + "REALTIME=%llu\n" + "MONOTONIC=%llu\n", + (unsigned long long) s->timestamp.realtime, + (unsigned long long) s->timestamp.monotonic); + + if (s->controller) + fprintf(f, "CONTROLLER=%s\n", s->controller); fflush(f); @@ -216,9 +255,6 @@ int session_save(Session *s) { unlink(temp_path); } - fclose(f); - free(temp_path); - finish: if (r < 0) log_error("Failed to save session data for %s: %s", s->id, strerror(-r)); @@ -227,14 +263,16 @@ finish: } int session_load(Session *s) { - char *remote = NULL, - *kill_processes = NULL, + _cleanup_free_ char *remote = NULL, *seat = NULL, *vtnr = NULL, *leader = NULL, - *audit_id = NULL, *type = NULL, - *class = NULL; + *class = NULL, + *uid = NULL, + *realtime = NULL, + *monotonic = NULL, + *controller = NULL; int k, r; @@ -242,8 +280,8 @@ int session_load(Session *s) { r = parse_env_file(s->state_file, NEWLINE, "REMOTE", &remote, - "KILL_PROCESSES", &kill_processes, - "CGROUP", &s->cgroup_path, + "SCOPE", &s->scope, + "SCOPE_JOB", &s->scope_job, "FIFO", &s->fifo_path, "SEAT", &seat, "TTY", &s->tty, @@ -255,10 +293,40 @@ int session_load(Session *s) { "LEADER", &leader, "TYPE", &type, "CLASS", &class, + "UID", &uid, + "REALTIME", &realtime, + "MONOTONIC", &monotonic, + "CONTROLLER", &controller, NULL); - if (r < 0) - goto finish; + if (r < 0) { + log_error("Failed to read %s: %s", s->state_file, strerror(-r)); + return r; + } + + if (!s->user) { + uid_t u; + User *user; + + if (!uid) { + log_error("UID not specified for session %s", s->id); + return -ENOENT; + } + + r = parse_uid(uid, &u); + if (r < 0) { + log_error("Failed to parse UID value %s for session %s.", uid, s->id); + return r; + } + + user = hashmap_get(s->manager->users, ULONG_TO_PTR((unsigned long) u)); + if (!user) { + log_error("User of session %s not known.", s->id); + return -ENOENT; + } + + session_set_user(s, user); + } if (remote) { k = parse_boolean(remote); @@ -266,27 +334,21 @@ int session_load(Session *s) { s->remote = k; } - if (kill_processes) { - k = parse_boolean(kill_processes); - if (k >= 0) - s->kill_processes = k; - } + if (vtnr) + safe_atou(vtnr, &s->vtnr); if (seat && !s->seat) { Seat *o; o = hashmap_get(s->manager->seats, seat); if (o) - seat_attach_session(o, s); + r = seat_attach_session(o, s); + if (!o || r < 0) + log_error("Cannot attach session %s to seat %s", s->id, seat); } - if (vtnr && s->seat && seat_can_multi_session(s->seat)) { - int v; - - k = safe_atoi(vtnr, &v); - if (k >= 0 && v >= 1) - s->vtnr = v; - } + if (!s->seat || !seat_has_vts(s->seat)) + s->vtnr = 0; if (leader) { k = parse_pid(leader, &s->leader); @@ -323,25 +385,33 @@ int session_load(Session *s) { close_nointr_nofail(fd); } -finish: - free(remote); - free(kill_processes); - free(seat); - free(vtnr); - free(leader); - free(audit_id); - free(class); + if (realtime) { + unsigned long long l; + if (sscanf(realtime, "%llu", &l) > 0) + s->timestamp.realtime = l; + } + + if (monotonic) { + unsigned long long l; + if (sscanf(monotonic, "%llu", &l) > 0) + s->timestamp.monotonic = l; + } + + if (controller) { + if (bus_name_has_owner(s->manager->bus, controller, NULL) > 0) + session_set_controller(s, controller, false); + else + session_restore_vt(s); + } return r; } int session_activate(Session *s) { - int r; + unsigned int num_pending; assert(s); - - if (s->vtnr < 0) - return -ENOTSUP; + assert(s->user); if (!s->seat) return -ENOTSUP; @@ -349,17 +419,34 @@ int session_activate(Session *s) { if (s->seat->active == s) return 0; - assert(seat_is_vtconsole(s->seat)); + /* on seats with VTs, we let VTs manage session-switching */ + if (seat_has_vts(s->seat)) { + if (!s->vtnr) + return -ENOTSUP; - r = chvt(s->vtnr); - if (r < 0) - return r; + return chvt(s->vtnr); + } + + /* On seats without VTs, we implement session-switching in logind. We + * try to pause all session-devices and wait until the session + * controller acknowledged them. Once all devices are asleep, we simply + * switch the active session and be done. + * We save the session we want to switch to in seat->pending_switch and + * seat_complete_switch() will perform the final switch. */ + + s->seat->pending_switch = s; - return seat_set_active(s->seat, s); + /* if no devices are running, immediately perform the session switch */ + num_pending = session_device_try_pause_all(s); + if (!num_pending) + seat_complete_switch(s->seat); + + return 0; } static int session_link_x11_socket(Session *s) { - char *t, *f, *c; + _cleanup_free_ char *t = NULL, *f = NULL; + char *c; size_t k; assert(s); @@ -383,7 +470,6 @@ static int session_link_x11_socket(Session *s) { if (access(f, F_OK) < 0) { log_warning("Session %s has display %s with non-existing socket %s.", s->id, s->display, f); - free(f); return -ENOENT; } @@ -392,10 +478,8 @@ static int session_link_x11_socket(Session *s) { * path is owned by the user */ t = strappend(s->user->runtime_path, "/X11-display"); - if (!t) { - free(f); + if (!t) return log_oom(); - } if (link(f, t) < 0) { if (errno == EEXIST) { @@ -415,118 +499,56 @@ static int session_link_x11_socket(Session *s) { } log_error("Failed to link %s to %s: %m", f, t); - free(f); - free(t); return -errno; } } done: log_info("Linked %s to %s.", f, t); - free(f); - free(t); - s->user->display = s; return 0; } -static int session_create_one_group(Session *s, const char *controller, const char *path) { - int r; - - assert(s); - assert(controller); - assert(path); - - if (s->leader > 0) { - r = cg_create_and_attach(controller, path, s->leader); - if (r < 0) - r = cg_create(controller, path); - } else - r = cg_create(controller, path); - - if (r < 0) - return r; - - r = cg_set_task_access(controller, path, 0644, s->user->uid, s->user->gid, -1); - if (r >= 0) - r = cg_set_group_access(controller, path, 0755, s->user->uid, s->user->gid); - - return r; -} - -static int session_create_cgroup(Session *s) { - char **k; - char *p; +static int session_start_scope(Session *s) { int r; assert(s); assert(s->user); - assert(s->user->cgroup_path); - - if (!s->cgroup_path) { - if (asprintf(&p, "%s/%s", s->user->cgroup_path, s->id) < 0) - return log_oom(); - } else - p = s->cgroup_path; - - r = session_create_one_group(s, SYSTEMD_CGROUP_CONTROLLER, p); - if (r < 0) { - log_error("Failed to create "SYSTEMD_CGROUP_CONTROLLER":%s: %s", p, strerror(-r)); - free(p); - s->cgroup_path = NULL; - return r; - } - - s->cgroup_path = p; - - STRV_FOREACH(k, s->controllers) { + assert(s->user->slice); - if (strv_contains(s->reset_controllers, *k)) - continue; + if (!s->scope) { + _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; + _cleanup_free_ char *description = NULL; + const char *kill_mode; + char *scope, *job; - r = session_create_one_group(s, *k, p); - if (r < 0) - log_warning("Failed to create %s:%s: %s", *k, p, strerror(-r)); - } - - STRV_FOREACH(k, s->manager->controllers) { - - if (strv_contains(s->reset_controllers, *k) || - strv_contains(s->manager->reset_controllers, *k) || - strv_contains(s->controllers, *k)) - continue; - - r = session_create_one_group(s, *k, p); - if (r < 0) - log_warning("Failed to create %s:%s: %s", *k, p, strerror(-r)); - } - - if (s->leader > 0) { - - STRV_FOREACH(k, s->reset_controllers) { - r = cg_attach(*k, "/", s->leader); - if (r < 0) - log_warning("Failed to reset controller %s: %s", *k, strerror(-r)); - - } + description = strjoin("Session ", s->id, " of user ", s->user->name, NULL); + if (!description) + return log_oom(); - STRV_FOREACH(k, s->manager->reset_controllers) { + scope = strjoin("session-", s->id, ".scope", NULL); + if (!scope) + return log_oom(); - if (strv_contains(s->reset_controllers, *k) || - strv_contains(s->controllers, *k)) - continue; + kill_mode = manager_shall_kill(s->manager, s->user->name) ? "control-group" : "none"; - r = cg_attach(*k, "/", s->leader); - if (r < 0) - log_warning("Failed to reset controller %s: %s", *k, strerror(-r)); + r = manager_start_scope(s->manager, scope, s->leader, s->user->slice, description, "systemd-user-sessions.service", kill_mode, &error, &job); + if (r < 0) { + log_error("Failed to start session scope %s: %s %s", + scope, bus_error_message(&error, r), error.name); + free(scope); + return r; + } else { + s->scope = scope; + free(s->scope_job); + s->scope_job = job; } } - r = hashmap_put(s->manager->session_cgroups, s->cgroup_path, s); - if (r < 0) - log_warning("Failed to create mapping between cgroup and session"); + if (s->scope) + hashmap_put(s->manager->session_units, s->scope, s); return 0; } @@ -535,7 +557,9 @@ int session_start(Session *s) { int r; assert(s); - assert(s->user); + + if (!s->user) + return -ESTALE; if (s->started) return 0; @@ -544,6 +568,11 @@ int session_start(Session *s) { if (r < 0) return r; + /* Create cgroup */ + r = session_start_scope(s); + if (r < 0) + return r; + log_struct(s->type == SESSION_TTY || s->type == SESSION_X11 ? LOG_INFO : LOG_DEBUG, MESSAGE_ID(SD_MESSAGE_SESSION_START), "SESSION_ID=%s", s->id, @@ -552,15 +581,11 @@ int session_start(Session *s) { "MESSAGE=New session %s of user %s.", s->id, s->user->name, NULL); - /* Create cgroup */ - r = session_create_cgroup(s); - if (r < 0) - return r; - /* Create X11 symlink */ session_link_x11_socket(s); - dual_timestamp_get(&s->timestamp); + if (!dual_timestamp_is_set(&s->timestamp)) + dual_timestamp_get(&s->timestamp); if (s->seat) seat_read_active_vt(s->seat); @@ -577,89 +602,40 @@ int session_start(Session *s) { seat_save(s->seat); if (s->seat->active == s) - seat_send_changed(s->seat, "Sessions\0ActiveSession\0"); + seat_send_changed(s->seat, "Sessions", "ActiveSession", NULL); else - seat_send_changed(s->seat, "Sessions\0"); + seat_send_changed(s->seat, "Sessions", NULL); } - user_send_changed(s->user, "Sessions\0"); + user_send_changed(s->user, "Sessions", NULL); return 0; } -static bool session_shall_kill(Session *s) { - assert(s); - - if (!s->kill_processes) - return false; - - if (strv_contains(s->manager->kill_exclude_users, s->user->name)) - return false; - - if (strv_isempty(s->manager->kill_only_users)) - return true; - - return strv_contains(s->manager->kill_only_users, s->user->name); -} - -static int session_terminate_cgroup(Session *s) { +static int session_stop_scope(Session *s) { + _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; + char *job; int r; - char **k; assert(s); - if (!s->cgroup_path) + if (!s->scope) return 0; - cg_trim(SYSTEMD_CGROUP_CONTROLLER, s->cgroup_path, false); - - if (session_shall_kill(s)) { - - r = cg_kill_recursive_and_wait(SYSTEMD_CGROUP_CONTROLLER, s->cgroup_path, true); - if (r < 0) - log_error("Failed to kill session cgroup: %s", strerror(-r)); - - } else { - if (s->leader > 0) { - Session *t; - - /* We still send a HUP to the leader process, - * even if we are not supposed to kill the - * whole cgroup. But let's first check the - * leader still exists and belongs to our - * session... */ - - r = manager_get_session_by_pid(s->manager, s->leader, &t); - if (r > 0 && t == s) { - kill(s->leader, SIGTERM); /* for normal processes */ - kill(s->leader, SIGHUP); /* for shells */ - kill(s->leader, SIGCONT); /* in case they are stopped */ - } - } - - r = cg_is_empty_recursive(SYSTEMD_CGROUP_CONTROLLER, s->cgroup_path, true); - if (r < 0) - log_error("Failed to check session cgroup: %s", strerror(-r)); - else if (r > 0) { - r = cg_delete(SYSTEMD_CGROUP_CONTROLLER, s->cgroup_path); - if (r < 0) - log_error("Failed to delete session cgroup: %s", strerror(-r)); - } + r = manager_stop_unit(s->manager, s->scope, &error, &job); + if (r < 0) { + log_error("Failed to stop session scope: %s", bus_error_message(&error, r)); + return r; } - STRV_FOREACH(k, s->user->manager->controllers) - cg_trim(*k, s->cgroup_path, true); - - hashmap_remove(s->manager->session_cgroups, s->cgroup_path); - - free(s->cgroup_path); - s->cgroup_path = NULL; + free(s->scope_job); + s->scope_job = job; return 0; } static int session_unlink_x11_socket(Session *s) { - char *t; + _cleanup_free_ char *t = NULL; int r; assert(s); @@ -675,16 +651,35 @@ static int session_unlink_x11_socket(Session *s) { return log_oom(); r = unlink(t); - free(t); - return r < 0 ? -errno : 0; } int session_stop(Session *s) { - int r = 0, k; + int r; + + assert(s); + + if (!s->user) + return -ESTALE; + + /* Kill cgroup */ + r = session_stop_scope(s); + + session_save(s); + user_save(s->user); + + return r; +} + +int session_finalize(Session *s) { + int r = 0; + SessionDevice *sd; assert(s); + if (!s->user) + return -ESTALE; + if (s->started) log_struct(s->type == SESSION_TTY || s->type == SESSION_X11 ? LOG_INFO : LOG_DEBUG, MESSAGE_ID(SD_MESSAGE_SESSION_STOP), @@ -694,10 +689,9 @@ int session_stop(Session *s) { "MESSAGE=Removed session %s.", s->id, NULL); - /* Kill cgroup */ - k = session_terminate_cgroup(s); - if (k < 0) - r = k; + /* Kill session devices */ + while ((sd = hashmap_first(s->devices))) + session_device_free(sd); /* Remove X11 symlink */ session_unlink_x11_socket(s); @@ -706,22 +700,22 @@ int session_stop(Session *s) { session_add_to_gc_queue(s); user_add_to_gc_queue(s->user); - if (s->started) + if (s->started) { session_send_signal(s, false); + s->started = false; + } if (s->seat) { if (s->seat->active == s) seat_set_active(s->seat, NULL); - seat_send_changed(s->seat, "Sessions\0"); + seat_send_changed(s->seat, "Sessions", NULL); seat_save(s->seat); } - user_send_changed(s->user, "Sessions\0"); + user_send_changed(s->user, "Sessions", NULL); user_save(s->user); - s->started = false; - return r; } @@ -806,28 +800,6 @@ int session_get_idle_hint(Session *s, dual_timestamp *t) { goto found_atime; } - /* For other TTY sessions, let's find the most recent atime of - * the ttys of any of the processes of the session */ - if (s->cgroup_path) { - _cleanup_fclose_ FILE *f = NULL; - - if (cg_enumerate_processes(SYSTEMD_CGROUP_CONTROLLER, s->cgroup_path, &f) >= 0) { - pid_t pid; - - atime = 0; - while (cg_read_pid(f, &pid) > 0) { - usec_t a; - - if (get_process_ctty_atime(pid, &a) >= 0) - if (atime == 0 || atime < a) - atime = a; - } - - if (atime != 0) - goto found_atime; - } - } - dont_know: if (t) *t = s->idle_hint_timestamp; @@ -855,26 +827,27 @@ void session_set_idle_hint(Session *s, bool b) { s->idle_hint = b; dual_timestamp_get(&s->idle_hint_timestamp); - session_send_changed(s, - "IdleHint\0" - "IdleSinceHint\0" - "IdleSinceHintMonotonic\0"); + session_send_changed(s, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL); if (s->seat) - seat_send_changed(s->seat, - "IdleHint\0" - "IdleSinceHint\0" - "IdleSinceHintMonotonic\0"); - - user_send_changed(s->user, - "IdleHint\0" - "IdleSinceHint\0" - "IdleSinceHintMonotonic\0"); - - manager_send_changed(s->manager, - "IdleHint\0" - "IdleSinceHint\0" - "IdleSinceHintMonotonic\0"); + seat_send_changed(s->seat, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL); + + user_send_changed(s->user, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL); + manager_send_changed(s->manager, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL); +} + +static int session_dispatch_fifo(sd_event_source *es, int fd, uint32_t revents, void *userdata) { + Session *s = userdata; + + assert(s); + assert(s->fifo_fd == fd); + + /* EOF on the FIFO means the session died abnormally. */ + + session_remove_fifo(s); + session_stop(s); + + return 1; } int session_create_fifo(Session *s) { @@ -897,22 +870,20 @@ int session_create_fifo(Session *s) { /* Open reading side */ if (s->fifo_fd < 0) { - struct epoll_event ev; - s->fifo_fd = open(s->fifo_path, O_RDONLY|O_CLOEXEC|O_NDELAY); if (s->fifo_fd < 0) return -errno; - r = hashmap_put(s->manager->session_fds, INT_TO_PTR(s->fifo_fd + 1), s); + } + + if (!s->fifo_event_source) { + r = sd_event_add_io(s->manager->event, s->fifo_fd, 0, session_dispatch_fifo, s, &s->fifo_event_source); if (r < 0) return r; - zero(ev); - ev.events = 0; - ev.data.u32 = FD_OTHER_BASE + s->fifo_fd; - - if (epoll_ctl(s->manager->epoll_fd, EPOLL_CTL_ADD, s->fifo_fd, &ev) < 0) - return -errno; + r = sd_event_source_set_priority(s->fifo_event_source, SD_EVENT_PRIORITY_IDLE); + if (r < 0) + return r; } /* Open writing side */ @@ -926,14 +897,12 @@ int session_create_fifo(Session *s) { void session_remove_fifo(Session *s) { assert(s); + if (s->fifo_event_source) + s->fifo_event_source = sd_event_source_unref(s->fifo_event_source); + if (s->fifo_fd >= 0) { - assert_se(hashmap_remove(s->manager->session_fds, INT_TO_PTR(s->fifo_fd + 1)) == s); - assert_se(epoll_ctl(s->manager->epoll_fd, EPOLL_CTL_DEL, s->fifo_fd, NULL) == 0); close_nointr_nofail(s->fifo_fd); s->fifo_fd = -1; - - session_save(s); - user_save(s->user); } if (s->fifo_path) { @@ -943,35 +912,33 @@ void session_remove_fifo(Session *s) { } } -int session_check_gc(Session *s, bool drop_not_started) { +bool session_check_gc(Session *s, bool drop_not_started) { int r; assert(s); if (drop_not_started && !s->started) - return 0; + return false; - if (s->fifo_fd >= 0) { + if (!s->user) + return false; + if (s->fifo_fd >= 0) { r = pipe_eof(s->fifo_fd); if (r < 0) - return r; + return true; if (r == 0) - return 1; + return true; } - if (s->cgroup_path) { - - r = cg_is_empty_recursive(SYSTEMD_CGROUP_CONTROLLER, s->cgroup_path, false); - if (r < 0) - return r; + if (s->scope_job && manager_job_is_active(s->manager, s->scope_job)) + return true; - if (r <= 0) - return 1; - } + if (s->scope && manager_unit_is_active(s->manager, s->scope)) + return true; - return 0; + return false; } void session_add_to_gc_queue(Session *s) { @@ -980,13 +947,19 @@ void session_add_to_gc_queue(Session *s) { if (s->in_gc_queue) return; - LIST_PREPEND(Session, gc_queue, s->manager->session_gc_queue, s); + LIST_PREPEND(gc_queue, s->manager->session_gc_queue, s); s->in_gc_queue = true; } SessionState session_get_state(Session *s) { assert(s); + if (s->closing) + return SESSION_CLOSING; + + if (s->scope_job) + return SESSION_OPENING; + if (s->fifo_fd < 0) return SESSION_CLOSING; @@ -997,47 +970,185 @@ SessionState session_get_state(Session *s) { } int session_kill(Session *s, KillWho who, int signo) { - int r = 0; - Set *pid_set = NULL; - assert(s); - if (!s->cgroup_path) + if (!s->scope) return -ESRCH; - if (s->leader <= 0 && who == KILL_LEADER) - return -ESRCH; + return manager_kill_unit(s->manager, s->scope, who, signo, NULL); +} - if (s->leader > 0) - if (kill(s->leader, signo) < 0) - r = -errno; +static int session_open_vt(Session *s) { + char path[128]; - if (who == KILL_ALL) { - int q; + if (!s->vtnr) + return -1; - pid_set = set_new(trivial_hash_func, trivial_compare_func); - if (!pid_set) - return -ENOMEM; + if (s->vtfd >= 0) + return s->vtfd; - if (s->leader > 0) { - q = set_put(pid_set, LONG_TO_PTR(s->leader)); - if (q < 0) - r = q; - } + sprintf(path, "/dev/tty%u", s->vtnr); + s->vtfd = open(path, O_RDWR | O_CLOEXEC | O_NONBLOCK | O_NOCTTY); + if (s->vtfd < 0) { + log_error("cannot open VT %s of session %s: %m", path, s->id); + return -1; + } + + return s->vtfd; +} + +static int session_vt_fn(sd_event_source *source, const struct signalfd_siginfo *si, void *data) { + Session *s = data; + + if (s->vtfd >= 0) + ioctl(s->vtfd, VT_RELDISP, 1); + + return 0; +} + +void session_mute_vt(Session *s) { + int vt, r; + struct vt_mode mode = { 0 }; + sigset_t mask; + + vt = session_open_vt(s); + if (vt < 0) + return; + + r = ioctl(vt, KDSKBMODE, K_OFF); + if (r < 0) + goto error; + + r = ioctl(vt, KDSETMODE, KD_GRAPHICS); + if (r < 0) + goto error; + + sigemptyset(&mask); + sigaddset(&mask, SIGUSR1); + sigprocmask(SIG_BLOCK, &mask, NULL); + + r = sd_event_add_signal(s->manager->event, SIGUSR1, session_vt_fn, s, &s->vt_source); + if (r < 0) + goto error; + + /* Oh, thanks to the VT layer, VT_AUTO does not work with KD_GRAPHICS. + * So we need a dummy handler here which just acknowledges *all* VT + * switch requests. */ + mode.mode = VT_PROCESS; + mode.relsig = SIGUSR1; + mode.acqsig = SIGUSR1; + r = ioctl(vt, VT_SETMODE, &mode); + if (r < 0) + goto error; + + return; + +error: + log_error("cannot mute VT %u for session %s (%d/%d)", s->vtnr, s->id, r, errno); + session_restore_vt(s); +} + +void session_restore_vt(Session *s) { + _cleanup_free_ char *utf8; + int vt, kb = K_XLATE; + struct vt_mode mode = { 0 }; + + vt = session_open_vt(s); + if (vt < 0) + return; + + sd_event_source_unref(s->vt_source); + s->vt_source = NULL; - q = cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER, s->cgroup_path, signo, false, true, false, pid_set); - if (q < 0) - if (q != -EAGAIN && q != -ESRCH && q != -ENOENT) - r = q; + ioctl(vt, KDSETMODE, KD_TEXT); + + if (read_one_line_file("/sys/module/vt/parameters/default_utf8", &utf8) >= 0 && *utf8 == '1') + kb = K_UNICODE; + ioctl(vt, KDSKBMODE, kb); + + mode.mode = VT_AUTO; + ioctl(vt, VT_SETMODE, &mode); + + close_nointr_nofail(vt); + s->vtfd = -1; +} + +bool session_is_controller(Session *s, const char *sender) { + assert(s); + + return streq_ptr(s->controller, sender); +} + +static void session_swap_controller(Session *s, char *name) { + SessionDevice *sd; + + if (s->controller) { + manager_drop_busname(s->manager, s->controller); + free(s->controller); + s->controller = NULL; + + /* Drop all devices as they're now unused. Do that after the + * controller is released to avoid sending out useles + * dbus signals. */ + while ((sd = hashmap_first(s->devices))) + session_device_free(sd); + + if (!name) + session_restore_vt(s); } - if (pid_set) - set_free(pid_set); + s->controller = name; + session_save(s); +} - return r; +int session_set_controller(Session *s, const char *sender, bool force) { + char *t; + int r; + + assert(s); + assert(sender); + + if (session_is_controller(s, sender)) + return 0; + if (s->controller && !force) + return -EBUSY; + + t = strdup(sender); + if (!t) + return -ENOMEM; + + r = manager_watch_busname(s->manager, sender); + if (r) { + free(t); + return r; + } + + session_swap_controller(s, t); + + /* When setting a session controller, we forcibly mute the VT and set + * it into graphics-mode. Applications can override that by changing + * VT state after calling TakeControl(). However, this serves as a good + * default and well-behaving controllers can now ignore VTs entirely. + * Note that we reset the VT on ReleaseControl() and if the controller + * exits. + * If logind crashes/restarts, we restore the controller during restart + * or reset the VT in case it crashed/exited, too. */ + session_mute_vt(s); + + return 0; +} + +void session_drop_controller(Session *s) { + assert(s); + + if (!s->controller) + return; + + session_swap_controller(s, NULL); } -static const char* const session_state_table[_SESSION_TYPE_MAX] = { +static const char* const session_state_table[_SESSION_STATE_MAX] = { + [SESSION_OPENING] = "opening", [SESSION_ONLINE] = "online", [SESSION_ACTIVE] = "active", [SESSION_CLOSING] = "closing" @@ -1056,7 +1167,8 @@ DEFINE_STRING_TABLE_LOOKUP(session_type, SessionType); static const char* const session_class_table[_SESSION_CLASS_MAX] = { [SESSION_USER] = "user", [SESSION_GREETER] = "greeter", - [SESSION_LOCK_SCREEN] = "lock-screen" + [SESSION_LOCK_SCREEN] = "lock-screen", + [SESSION_BACKGROUND] = "background" }; DEFINE_STRING_TABLE_LOOKUP(session_class, SessionClass);