logind-user.c revision 2138e96918c7ed6fbf31f5df509f337a1973dfdd
/*-*- 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);
if (u->cgroup_path)
hashmap_remove(u->manager->user_cgroups, u->cgroup_path);
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 = mkdir_safe_label("/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;
bool first;
fputs("SESSIONS=", f);
first = true;
LIST_FOREACH(sessions_by_user, i, u->sessions) {
if (first)
first = false;
else
fputc(' ', f);
fputs(i->id, f);
}
fputs("\nSEATS=", f);
first = true;
LIST_FOREACH(sessions_by_user, i, u->sessions) {
if (!i->seat)
continue;
if (first)
first = false;
else
fputc(' ', f);
fputs(i->seat->id, f);
}
fputs("\nACTIVE_SESSIONS=", f);
first = true;
LIST_FOREACH(sessions_by_user, i, u->sessions) {
if (!session_is_active(i))
continue;
if (first)
first = false;
else
fputc(' ', f);
fputs(i->id, f);
}
fputs("\nACTIVE_SEATS=", f);
first = true;
LIST_FOREACH(sessions_by_user, i, u->sessions) {
if (!session_is_active(i) || !i->seat)
continue;
if (first)
first = false;
else
fputs(i->seat->id, f);
}
fputc('\n', f);
}
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 = mkdir_safe_label("/run/user", 0755, 0, 0);
if (r < 0) {
log_error("Failed to create /run/user: %s", strerror(-r));
return r;
}
if (!u->runtime_path) {
if (asprintf(&p, "/run/user/%lu", (unsigned long) u->uid) < 0) {
log_error("Out of memory");
return -ENOMEM;
}
} else
p = u->runtime_path;
r = mkdir_safe_label(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));
}
hashmap_put(u->manager->user_cgroups, u->cgroup_path, u);
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);
hashmap_remove(u->manager->user_cgroups, u->cgroup_path);
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;
}
static int user_check_linger_file(User *u) {
char *p;
int r;
if (asprintf(&p, "/var/lib/systemd/linger/%s", u->name) < 0)
return -ENOMEM;
r = access(p, F_OK) >= 0;
free(p);
return r;
}
int user_check_gc(User *u, bool drop_not_started) {
int r;
assert(u);
if (drop_not_started && !u->started)
return 0;
if (u->sessions)
return 1;
if (user_check_linger_file(u) > 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);
LIST_FOREACH(sessions_by_user, i, u->sessions)
if (session_is_active(i))
return USER_ACTIVE;
if (u->sessions)
return USER_ONLINE;
if (user_check_linger_file(u) > 0)
return USER_LINGERING;
return USER_CLOSING;
}
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",
[USER_CLOSING] = "closing"
};
DEFINE_STRING_TABLE_LOOKUP(user_state, UserState);