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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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This file is part of systemd.
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Copyright 2011 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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#include "logind-user.h"
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#include "cgroup-util.h"
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User* user_new(Manager *m, uid_t uid, gid_t gid, const char *name) {
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u->name = strdup(name);
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if (asprintf(&u->state_file, "/run/systemd/users/%lu", (unsigned long) uid) < 0) {
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if (hashmap_put(m->users, ULONG_TO_PTR((unsigned long) uid), u) < 0) {
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void user_free(User *u) {
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LIST_REMOVE(User, gc_queue, u->manager->user_gc_queue, u);
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session_free(u->sessions);
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free(u->runtime_path);
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hashmap_remove(u->manager->users, ULONG_TO_PTR((unsigned long) u->uid));
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int user_save(User *u) {
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assert(u->state_file);
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r = safe_mkdir("/run/systemd/users", 0755, 0, 0);
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r = fopen_temporary(u->state_file, &f, &temp_path);
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fchmod(fileno(f), 0644);
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"# This is private data. Do not parse.\n"
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user_state_to_string(user_get_state(u)));
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fputs("SESSIONS=", f);
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LIST_FOREACH(sessions_by_user, i, u->sessions) {
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i->sessions_by_user_next ? ' ' : '\n');
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LIST_FOREACH(sessions_by_user, i, u->sessions) {
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i->sessions_by_user_next ? ' ' : '\n');
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fputs("ACTIVE_SESSIONS=", f);
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LIST_FOREACH(sessions_by_user, i, u->sessions)
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if (session_is_active(i))
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(unsigned long) i->user->uid,
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i->sessions_by_user_next ? ' ' : '\n');
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fputs("ACTIVE_SEATS=", f);
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LIST_FOREACH(sessions_by_user, i, u->sessions) {
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if (session_is_active(i) && i->seat)
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i->sessions_by_user_next ? ' ' : '\n');
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if (ferror(f) || rename(temp_path, u->state_file) < 0) {
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unlink(u->state_file);
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log_error("Failed to save user data for %s: %s", u->name, strerror(-r));
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int user_load(User *u) {
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char *display = NULL;
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r = parse_env_file(u->state_file, NEWLINE,
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"CGROUP", &u->cgroup_path,
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"RUNTIME", &u->runtime_path,
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"SERVICE", &u->service,
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log_error("Failed to read %s: %s", u->state_file, strerror(-r));
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s = hashmap_get(u->manager->sessions, display);
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if (s && s->display && display_is_local(s->display))
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static int user_mkdir_runtime_path(User *u) {
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r = safe_mkdir("/run/user", 0755, 0, 0);
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log_error("Failed to create /run/user: %s", strerror(-r));
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if (!u->runtime_path) {
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p = strappend("/run/user/", u->name);
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log_error("Out of memory");
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r = safe_mkdir(p, 0700, u->uid, u->gid);
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log_error("Failed to create runtime directory %s: %s", p, strerror(-r));
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u->runtime_path = NULL;
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static int user_create_cgroup(User *u) {
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if (!u->cgroup_path) {
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if (asprintf(&p, "%s/%s", u->manager->cgroup_path, u->name) < 0) {
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log_error("Out of memory");
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r = cg_create(SYSTEMD_CGROUP_CONTROLLER, p);
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log_error("Failed to create cgroup "SYSTEMD_CGROUP_CONTROLLER":%s: %s", p, strerror(-r));
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u->cgroup_path = NULL;
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STRV_FOREACH(k, u->manager->controllers) {
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if (strv_contains(u->manager->reset_controllers, *k))
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r = cg_create(*k, p);
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log_warning("Failed to create cgroup %s:%s: %s", *k, p, strerror(-r));
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static int user_start_service(User *u) {
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int user_start(User *u) {
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log_info("New user %s logged in.", u->name);
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/* Make XDG_RUNTIME_DIR */
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r = user_mkdir_runtime_path(u);
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r = user_create_cgroup(u);
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/* Spawn user systemd */
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r = user_start_service(u);
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dual_timestamp_get(&u->timestamp);
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/* Save new user data */
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user_send_signal(u, true);
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static int user_stop_service(User *u) {
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static int user_shall_kill(User *u) {
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if (!u->manager->kill_user_processes)
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if (strv_contains(u->manager->kill_exclude_users, u->name))
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if (strv_isempty(u->manager->kill_only_users))
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return strv_contains(u->manager->kill_only_users, u->name);
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static int user_terminate_cgroup(User *u) {
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cg_trim(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, false);
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if (user_shall_kill(u)) {
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r = cg_kill_recursive_and_wait(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, true);
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log_error("Failed to kill user cgroup: %s", strerror(-r));
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r = cg_is_empty_recursive(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, true);
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log_error("Failed to check user cgroup: %s", strerror(-r));
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r = cg_delete(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path);
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log_error("Failed to delete user cgroup: %s", strerror(-r));
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STRV_FOREACH(k, u->manager->controllers)
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cg_trim(*k, u->cgroup_path, true);
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free(u->cgroup_path);
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u->cgroup_path = NULL;
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static int user_remove_runtime_path(User *u) {
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if (!u->runtime_path)
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r = rm_rf(u->runtime_path, false, true, false);
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log_error("Failed to remove runtime directory %s: %s", u->runtime_path, strerror(-r));
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free(u->runtime_path);
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u->runtime_path = NULL;
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int user_stop(User *u) {
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log_info("User %s logged out.", u->name);
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LIST_FOREACH(sessions_by_user, s, u->sessions) {
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k = user_stop_service(u);
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k = user_terminate_cgroup(u);
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/* Kill XDG_RUNTIME_DIR */
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k = user_remove_runtime_path(u);
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unlink(u->state_file);
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user_add_to_gc_queue(u);
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user_send_signal(u, false);
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int user_get_idle_hint(User *u, dual_timestamp *t) {
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bool idle_hint = true;
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dual_timestamp ts = { 0, 0 };
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LIST_FOREACH(sessions_by_user, s, u->sessions) {
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ih = session_get_idle_hint(s, &k);
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if (k.monotonic < ts.monotonic)
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} else if (idle_hint) {
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if (k.monotonic > ts.monotonic)
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int user_check_gc(User *u, bool drop_not_started) {
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if (drop_not_started && !u->started)
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if (asprintf(&p, "/var/lib/systemd/linger/%s", u->name) < 0)
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r = access(p, F_OK) >= 0;
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if (u->cgroup_path) {
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r = cg_is_empty_recursive(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, false);
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void user_add_to_gc_queue(User *u) {
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LIST_PREPEND(User, gc_queue, u->manager->user_gc_queue, u);
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u->in_gc_queue = true;
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UserState user_get_state(User *u) {
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return USER_LINGERING;
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LIST_FOREACH(sessions_by_user, i, u->sessions)
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if (session_is_active(i))
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int user_kill(User *u, int signo) {
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pid_set = set_new(trivial_hash_func, trivial_compare_func);
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q = cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, signo, false, true, false, pid_set);
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if (q != -EAGAIN && q != -ESRCH && q != -ENOENT)
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static const char* const user_state_table[_USER_STATE_MAX] = {
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[USER_OFFLINE] = "offline",
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[USER_LINGERING] = "lingering",
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[USER_ONLINE] = "online",
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[USER_ACTIVE] = "active"
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DEFINE_STRING_TABLE_LOOKUP(user_state, UserState);