| /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
| |
| /*** |
| This file is part of systemd. |
| |
| Copyright 2011 Lennart Poettering |
| |
| systemd is free software; you can redistribute it and/or modify it |
| under the terms of the GNU Lesser General Public License as published by |
| the Free Software Foundation; either version 2.1 of the License, or |
| (at your option) any later version. |
| |
| systemd is distributed in the hope that it will be useful, but |
| WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public License |
| along with systemd; If not, see <http://www.gnu.org/licenses/>. |
| ***/ |
| |
| #include <string.h> |
| #include <unistd.h> |
| #include <errno.h> |
| |
| #include "logind-user.h" |
| #include "util.h" |
| #include "mkdir.h" |
| #include "cgroup-util.h" |
| #include "hashmap.h" |
| #include "strv.h" |
| |
| User* user_new(Manager *m, uid_t uid, gid_t gid, const char *name) { |
| User *u; |
| |
| assert(m); |
| assert(name); |
| |
| u = new0(User, 1); |
| if (!u) |
| return NULL; |
| |
| u->name = strdup(name); |
| if (!u->name) { |
| free(u); |
| return NULL; |
| } |
| |
| if (asprintf(&u->state_file, "/run/systemd/users/%lu", (unsigned long) uid) < 0) { |
| free(u->name); |
| free(u); |
| return NULL; |
| } |
| |
| if (hashmap_put(m->users, ULONG_TO_PTR((unsigned long) uid), u) < 0) { |
| free(u->state_file); |
| free(u->name); |
| free(u); |
| return NULL; |
| } |
| |
| u->manager = m; |
| u->uid = uid; |
| u->gid = gid; |
| |
| return u; |
| } |
| |
| void user_free(User *u) { |
| assert(u); |
| |
| if (u->in_gc_queue) |
| LIST_REMOVE(User, gc_queue, u->manager->user_gc_queue, u); |
| |
| while (u->sessions) |
| session_free(u->sessions); |
| |
| free(u->cgroup_path); |
| |
| free(u->service); |
| free(u->runtime_path); |
| |
| hashmap_remove(u->manager->users, ULONG_TO_PTR((unsigned long) u->uid)); |
| |
| free(u->name); |
| free(u->state_file); |
| free(u); |
| } |
| |
| int user_save(User *u) { |
| FILE *f; |
| int r; |
| char *temp_path; |
| |
| assert(u); |
| assert(u->state_file); |
| |
| if (!u->started) |
| return 0; |
| |
| r = safe_mkdir("/run/systemd/users", 0755, 0, 0); |
| if (r < 0) |
| goto finish; |
| |
| r = fopen_temporary(u->state_file, &f, &temp_path); |
| if (r < 0) |
| goto finish; |
| |
| fchmod(fileno(f), 0644); |
| |
| fprintf(f, |
| "# This is private data. Do not parse.\n" |
| "NAME=%s\n" |
| "STATE=%s\n", |
| u->name, |
| user_state_to_string(user_get_state(u))); |
| |
| if (u->cgroup_path) |
| fprintf(f, |
| "CGROUP=%s\n", |
| u->cgroup_path); |
| |
| if (u->runtime_path) |
| fprintf(f, |
| "RUNTIME=%s\n", |
| u->runtime_path); |
| |
| if (u->service) |
| fprintf(f, |
| "SERVICE=%s\n", |
| u->service); |
| |
| if (u->display) |
| fprintf(f, |
| "DISPLAY=%s\n", |
| u->display->id); |
| |
| if (u->sessions) { |
| Session *i; |
| |
| fputs("SESSIONS=", f); |
| LIST_FOREACH(sessions_by_user, i, u->sessions) { |
| fprintf(f, |
| "%s%c", |
| i->id, |
| i->sessions_by_user_next ? ' ' : '\n'); |
| } |
| |
| fputs("SEATS=", f); |
| LIST_FOREACH(sessions_by_user, i, u->sessions) { |
| if (i->seat) |
| fprintf(f, |
| "%s%c", |
| i->seat->id, |
| i->sessions_by_user_next ? ' ' : '\n'); |
| } |
| |
| fputs("ACTIVE_SESSIONS=", f); |
| LIST_FOREACH(sessions_by_user, i, u->sessions) |
| if (session_is_active(i)) |
| fprintf(f, |
| "%lu%c", |
| (unsigned long) i->user->uid, |
| i->sessions_by_user_next ? ' ' : '\n'); |
| |
| fputs("ACTIVE_SEATS=", f); |
| LIST_FOREACH(sessions_by_user, i, u->sessions) { |
| if (session_is_active(i) && i->seat) |
| fprintf(f, |
| "%s%c", |
| i->seat->id, |
| i->sessions_by_user_next ? ' ' : '\n'); |
| } |
| } |
| |
| fflush(f); |
| |
| if (ferror(f) || rename(temp_path, u->state_file) < 0) { |
| r = -errno; |
| unlink(u->state_file); |
| unlink(temp_path); |
| } |
| |
| fclose(f); |
| free(temp_path); |
| |
| finish: |
| if (r < 0) |
| log_error("Failed to save user data for %s: %s", u->name, strerror(-r)); |
| |
| return r; |
| } |
| |
| int user_load(User *u) { |
| int r; |
| char *display = NULL; |
| Session *s = NULL; |
| |
| assert(u); |
| |
| r = parse_env_file(u->state_file, NEWLINE, |
| "CGROUP", &u->cgroup_path, |
| "RUNTIME", &u->runtime_path, |
| "SERVICE", &u->service, |
| "DISPLAY", &display, |
| NULL); |
| if (r < 0) { |
| free(display); |
| |
| if (r == -ENOENT) |
| return 0; |
| |
| log_error("Failed to read %s: %s", u->state_file, strerror(-r)); |
| return r; |
| } |
| |
| if (display) { |
| s = hashmap_get(u->manager->sessions, display); |
| free(display); |
| } |
| |
| if (s && s->display && display_is_local(s->display)) |
| u->display = s; |
| |
| return r; |
| } |
| |
| static int user_mkdir_runtime_path(User *u) { |
| char *p; |
| int r; |
| |
| assert(u); |
| |
| r = safe_mkdir("/run/user", 0755, 0, 0); |
| if (r < 0) { |
| log_error("Failed to create /run/user: %s", strerror(-r)); |
| return r; |
| } |
| |
| if (!u->runtime_path) { |
| p = strappend("/run/user/", u->name); |
| |
| if (!p) { |
| log_error("Out of memory"); |
| return -ENOMEM; |
| } |
| } else |
| p = u->runtime_path; |
| |
| r = safe_mkdir(p, 0700, u->uid, u->gid); |
| if (r < 0) { |
| log_error("Failed to create runtime directory %s: %s", p, strerror(-r)); |
| free(p); |
| u->runtime_path = NULL; |
| return r; |
| } |
| |
| u->runtime_path = p; |
| return 0; |
| } |
| |
| static int user_create_cgroup(User *u) { |
| char **k; |
| char *p; |
| int r; |
| |
| assert(u); |
| |
| if (!u->cgroup_path) { |
| if (asprintf(&p, "%s/%s", u->manager->cgroup_path, u->name) < 0) { |
| log_error("Out of memory"); |
| return -ENOMEM; |
| } |
| } else |
| p = u->cgroup_path; |
| |
| r = cg_create(SYSTEMD_CGROUP_CONTROLLER, p); |
| if (r < 0) { |
| log_error("Failed to create cgroup "SYSTEMD_CGROUP_CONTROLLER":%s: %s", p, strerror(-r)); |
| free(p); |
| u->cgroup_path = NULL; |
| return r; |
| } |
| |
| u->cgroup_path = p; |
| |
| STRV_FOREACH(k, u->manager->controllers) { |
| |
| if (strv_contains(u->manager->reset_controllers, *k)) |
| continue; |
| |
| r = cg_create(*k, p); |
| if (r < 0) |
| log_warning("Failed to create cgroup %s:%s: %s", *k, p, strerror(-r)); |
| } |
| |
| return 0; |
| } |
| |
| static int user_start_service(User *u) { |
| assert(u); |
| |
| /* FIXME: Fill me in later ... */ |
| |
| return 0; |
| } |
| |
| int user_start(User *u) { |
| int r; |
| |
| assert(u); |
| |
| if (u->started) |
| return 0; |
| |
| log_debug("New user %s logged in.", u->name); |
| |
| /* Make XDG_RUNTIME_DIR */ |
| r = user_mkdir_runtime_path(u); |
| if (r < 0) |
| return r; |
| |
| /* Create cgroup */ |
| r = user_create_cgroup(u); |
| if (r < 0) |
| return r; |
| |
| /* Spawn user systemd */ |
| r = user_start_service(u); |
| if (r < 0) |
| return r; |
| |
| dual_timestamp_get(&u->timestamp); |
| |
| u->started = true; |
| |
| /* Save new user data */ |
| user_save(u); |
| |
| user_send_signal(u, true); |
| |
| return 0; |
| } |
| |
| static int user_stop_service(User *u) { |
| assert(u); |
| |
| if (!u->service) |
| return 0; |
| |
| return 0; |
| } |
| |
| static int user_shall_kill(User *u) { |
| assert(u); |
| |
| if (!u->manager->kill_user_processes) |
| return false; |
| |
| if (strv_contains(u->manager->kill_exclude_users, u->name)) |
| return false; |
| |
| if (strv_isempty(u->manager->kill_only_users)) |
| return true; |
| |
| return strv_contains(u->manager->kill_only_users, u->name); |
| } |
| |
| static int user_terminate_cgroup(User *u) { |
| int r; |
| char **k; |
| |
| assert(u); |
| |
| if (!u->cgroup_path) |
| return 0; |
| |
| cg_trim(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, false); |
| |
| if (user_shall_kill(u)) { |
| |
| r = cg_kill_recursive_and_wait(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, true); |
| if (r < 0) |
| log_error("Failed to kill user cgroup: %s", strerror(-r)); |
| } else { |
| |
| r = cg_is_empty_recursive(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, true); |
| if (r < 0) |
| log_error("Failed to check user cgroup: %s", strerror(-r)); |
| else if (r > 0) { |
| r = cg_delete(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path); |
| if (r < 0) |
| log_error("Failed to delete user cgroup: %s", strerror(-r)); |
| } else |
| r = -EBUSY; |
| } |
| |
| STRV_FOREACH(k, u->manager->controllers) |
| cg_trim(*k, u->cgroup_path, true); |
| |
| free(u->cgroup_path); |
| u->cgroup_path = NULL; |
| |
| return r; |
| } |
| |
| static int user_remove_runtime_path(User *u) { |
| int r; |
| |
| assert(u); |
| |
| if (!u->runtime_path) |
| return 0; |
| |
| r = rm_rf(u->runtime_path, false, true, false); |
| if (r < 0) |
| log_error("Failed to remove runtime directory %s: %s", u->runtime_path, strerror(-r)); |
| |
| free(u->runtime_path); |
| u->runtime_path = NULL; |
| |
| return r; |
| } |
| |
| int user_stop(User *u) { |
| Session *s; |
| int r = 0, k; |
| assert(u); |
| |
| if (u->started) |
| log_debug("User %s logged out.", u->name); |
| |
| LIST_FOREACH(sessions_by_user, s, u->sessions) { |
| k = session_stop(s); |
| if (k < 0) |
| r = k; |
| } |
| |
| /* Kill systemd */ |
| k = user_stop_service(u); |
| if (k < 0) |
| r = k; |
| |
| /* Kill cgroup */ |
| k = user_terminate_cgroup(u); |
| if (k < 0) |
| r = k; |
| |
| /* Kill XDG_RUNTIME_DIR */ |
| k = user_remove_runtime_path(u); |
| if (k < 0) |
| r = k; |
| |
| unlink(u->state_file); |
| user_add_to_gc_queue(u); |
| |
| if (u->started) |
| user_send_signal(u, false); |
| |
| u->started = false; |
| |
| return r; |
| } |
| |
| int user_get_idle_hint(User *u, dual_timestamp *t) { |
| Session *s; |
| bool idle_hint = true; |
| dual_timestamp ts = { 0, 0 }; |
| |
| assert(u); |
| |
| LIST_FOREACH(sessions_by_user, s, u->sessions) { |
| dual_timestamp k; |
| int ih; |
| |
| ih = session_get_idle_hint(s, &k); |
| if (ih < 0) |
| return ih; |
| |
| if (!ih) { |
| if (!idle_hint) { |
| if (k.monotonic < ts.monotonic) |
| ts = k; |
| } else { |
| idle_hint = false; |
| ts = k; |
| } |
| } else if (idle_hint) { |
| |
| if (k.monotonic > ts.monotonic) |
| ts = k; |
| } |
| } |
| |
| if (t) |
| *t = ts; |
| |
| return idle_hint; |
| } |
| |
| int user_check_gc(User *u, bool drop_not_started) { |
| int r; |
| char *p; |
| |
| assert(u); |
| |
| if (drop_not_started && !u->started) |
| return 0; |
| |
| if (u->sessions) |
| return 1; |
| |
| if (asprintf(&p, "/var/lib/systemd/linger/%s", u->name) < 0) |
| return -ENOMEM; |
| |
| r = access(p, F_OK) >= 0; |
| free(p); |
| |
| if (r > 0) |
| return 1; |
| |
| if (u->cgroup_path) { |
| r = cg_is_empty_recursive(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, false); |
| if (r < 0) |
| return r; |
| |
| if (r <= 0) |
| return 1; |
| } |
| |
| return 0; |
| } |
| |
| void user_add_to_gc_queue(User *u) { |
| assert(u); |
| |
| if (u->in_gc_queue) |
| return; |
| |
| LIST_PREPEND(User, gc_queue, u->manager->user_gc_queue, u); |
| u->in_gc_queue = true; |
| } |
| |
| UserState user_get_state(User *u) { |
| Session *i; |
| |
| assert(u); |
| |
| if (!u->sessions) |
| return USER_LINGERING; |
| |
| LIST_FOREACH(sessions_by_user, i, u->sessions) |
| if (session_is_active(i)) |
| return USER_ACTIVE; |
| |
| return USER_ONLINE; |
| } |
| |
| int user_kill(User *u, int signo) { |
| int r = 0, q; |
| Set *pid_set = NULL; |
| |
| assert(u); |
| |
| if (!u->cgroup_path) |
| return -ESRCH; |
| |
| pid_set = set_new(trivial_hash_func, trivial_compare_func); |
| if (!pid_set) |
| return -ENOMEM; |
| |
| q = cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, signo, false, true, false, pid_set); |
| if (q < 0) |
| if (q != -EAGAIN && q != -ESRCH && q != -ENOENT) |
| r = q; |
| |
| if (pid_set) |
| set_free(pid_set); |
| |
| return r; |
| } |
| |
| static const char* const user_state_table[_USER_STATE_MAX] = { |
| [USER_OFFLINE] = "offline", |
| [USER_LINGERING] = "lingering", |
| [USER_ONLINE] = "online", |
| [USER_ACTIVE] = "active" |
| }; |
| |
| DEFINE_STRING_TABLE_LOOKUP(user_state, UserState); |