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-rw-r--r--src/login/logind-user.c589
1 files changed, 589 insertions, 0 deletions
diff --git a/src/login/logind-user.c b/src/login/logind-user.c
new file mode 100644
index 000000000..717f0e20a
--- /dev/null
+++ b/src/login/logind-user.c
@@ -0,0 +1,589 @@
+/*-*- 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 General Public License as published by
+ the Free Software Foundation; either version 2 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
+ General Public License for more details.
+
+ You should have received a copy of the GNU 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 "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);
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-24 07:02:57 +0000