452 lines
11 KiB
C
452 lines
11 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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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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***/
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#include <string.h>
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#include <unistd.h>
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#include <errno.h>
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#include "logind-user.h"
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#include "util.h"
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#include "cgroup-util.h"
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#include "hashmap.h"
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#include "strv.h"
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User* user_new(Manager *m, uid_t uid, gid_t gid, const char *name) {
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User *u;
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assert(m);
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assert(name);
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u = new0(User, 1);
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if (!u)
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return NULL;
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u->name = strdup(name);
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if (!u->name) {
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free(u);
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return NULL;
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}
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if (asprintf(&u->state_file, "/run/systemd/user/%lu", (unsigned long) uid) < 0) {
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free(u->name);
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free(u);
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return NULL;
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}
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if (hashmap_put(m->users, ULONG_TO_PTR((unsigned long) uid), u) < 0) {
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free(u->state_file);
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free(u->name);
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free(u);
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return NULL;
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}
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u->manager = m;
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u->uid = uid;
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u->gid = gid;
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return u;
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}
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void user_free(User *u) {
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assert(u);
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if (u->in_gc_queue)
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LIST_REMOVE(User, gc_queue, u->manager->user_gc_queue, u);
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while (u->sessions)
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session_free(u->sessions);
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free(u->cgroup_path);
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free(u->service);
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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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free(u->name);
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free(u->state_file);
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free(u);
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}
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int user_save(User *u) {
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FILE *f;
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int r;
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char *temp_path;
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assert(u);
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assert(u->state_file);
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r = safe_mkdir("/run/systemd/user", 0755, 0, 0);
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if (r < 0)
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goto finish;
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r = fopen_temporary(u->state_file, &f, &temp_path);
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if (r < 0)
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goto finish;
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fchmod(fileno(f), 0644);
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fprintf(f,
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"# This is private data. Do not parse.\n"
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"NAME=%s\n"
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"STATE=%s\n",
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u->name,
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user_state_to_string(user_get_state(u)));
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if (u->cgroup_path)
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fprintf(f,
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"CGROUP=%s\n",
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u->cgroup_path);
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if (u->runtime_path)
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fprintf(f,
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"RUNTIME=%s\n",
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u->runtime_path);
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if (u->service)
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fprintf(f,
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"SERVICE=%s\n",
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u->service);
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if (u->display)
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fprintf(f,
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"DISPLAY=%s\n",
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u->display->id);
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fflush(f);
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if (ferror(f) || rename(temp_path, u->state_file) < 0) {
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r = -errno;
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unlink(u->state_file);
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unlink(temp_path);
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}
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fclose(f);
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free(temp_path);
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finish:
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if (r < 0)
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log_error("Failed to save user data for %s: %s", u->name, strerror(-r));
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return r;
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}
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int user_load(User *u) {
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int r;
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char *display = NULL;
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Session *s;
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assert(u);
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r = parse_env_file(u->state_file, "r",
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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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"DISPLAY", &display,
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NULL);
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if (r < 0) {
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free(display);
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if (r == -ENOENT)
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return 0;
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log_error("Failed to read %s: %s", u->state_file, strerror(-r));
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return r;
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}
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s = hashmap_get(u->manager->sessions, display);
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free(display);
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if (s && s->display && x11_display_is_local(s->display))
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u->display = s;
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return r;
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}
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static int user_mkdir_runtime_path(User *u) {
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char *p;
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int r;
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assert(u);
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r = safe_mkdir("/run/user", 0755, 0, 0);
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if (r < 0) {
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log_error("Failed to create /run/user: %s", strerror(-r));
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return r;
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}
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if (!u->runtime_path) {
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p = strappend("/run/user/", u->name);
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if (!p) {
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log_error("Out of memory");
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return -ENOMEM;
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}
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} else
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p = u->runtime_path;
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r = safe_mkdir(p, 0700, u->uid, u->gid);
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if (r < 0) {
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log_error("Failed to create runtime directory %s: %s", p, strerror(-r));
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free(p);
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u->runtime_path = NULL;
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return r;
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}
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u->runtime_path = p;
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return 0;
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}
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static int user_create_cgroup(User *u) {
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char **k;
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char *p;
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int r;
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assert(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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return -ENOMEM;
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}
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} else
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p = u->cgroup_path;
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r = cg_create(SYSTEMD_CGROUP_CONTROLLER, p);
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if (r < 0) {
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free(p);
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u->cgroup_path = NULL;
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log_error("Failed to create cgroup "SYSTEMD_CGROUP_CONTROLLER":%s: %s", p, strerror(-r));
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return r;
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}
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u->cgroup_path = p;
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STRV_FOREACH(k, u->manager->controllers) {
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r = cg_create(*k, p);
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if (r < 0)
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log_warning("Failed to create cgroup %s:%s: %s", *k, p, strerror(-r));
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}
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return 0;
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}
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static int user_start_service(User *u) {
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assert(u);
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return 0;
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}
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int user_start(User *u) {
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int r;
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assert(u);
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/* Make XDG_RUNTIME_DIR */
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r = user_mkdir_runtime_path(u);
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if (r < 0)
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return r;
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/* Create cgroup */
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r = user_create_cgroup(u);
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if (r < 0)
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return r;
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/* Spawn user systemd */
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r = user_start_service(u);
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if (r < 0)
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return r;
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/* Save new user data */
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user_save(u);
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dual_timestamp_get(&u->timestamp);
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return 0;
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}
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static int user_stop_service(User *u) {
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assert(u);
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if (!u->service)
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return 0;
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return 0;
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}
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static int user_shall_kill(User *u) {
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assert(u);
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return u->manager->kill_user_processes;
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}
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static int user_kill_cgroup(User *u) {
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int r;
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char **k;
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assert(u);
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if (!u->cgroup_path)
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return 0;
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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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if (r < 0)
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log_error("Failed to kill user cgroup: %s", strerror(-r));
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} else {
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r = cg_is_empty_recursive(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, true);
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if (r < 0)
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log_error("Failed to check user cgroup: %s", strerror(-r));
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else if (r > 0) {
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r = cg_delete(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path);
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if (r < 0)
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log_error("Failed to delete user cgroup: %s", strerror(-r));
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} else
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r = -EBUSY;
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}
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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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return r;
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}
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static int user_remove_runtime_path(User *u) {
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int r;
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assert(u);
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if (!u->runtime_path)
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return 0;
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r = rm_rf(u->runtime_path, false, true);
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if (r < 0)
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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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return r;
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}
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int user_stop(User *u) {
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Session *s;
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int r = 0, k;
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assert(u);
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LIST_FOREACH(sessions_by_user, s, u->sessions) {
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k = session_stop(s);
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if (k < 0)
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r = k;
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}
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/* Kill systemd */
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k = user_stop_service(u);
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if (k < 0)
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r = k;
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/* Kill cgroup */
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k = user_kill_cgroup(u);
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if (k < 0)
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r = k;
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/* Kill XDG_RUNTIME_DIR */
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k = user_remove_runtime_path(u);
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if (k < 0)
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r = k;
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unlink(u->state_file);
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user_add_to_gc_queue(u);
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return r;
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}
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int user_check_gc(User *u) {
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int r;
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char *p;
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assert(u);
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if (u->sessions)
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return 1;
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if (asprintf(&p, "/var/lib/systemd/linger/%s", u->name) < 0)
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return -ENOMEM;
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r = access(p, F_OK) >= 0;
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free(p);
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if (r > 0)
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return 1;
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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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if (r < 0)
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return r;
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if (r <= 0)
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return 1;
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}
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return 0;
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}
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void user_add_to_gc_queue(User *u) {
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assert(u);
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if (u->in_gc_queue)
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return;
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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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}
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UserState user_get_state(User *u) {
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Session *i;
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assert(u);
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if (!u->sessions)
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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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return USER_ACTIVE;
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return USER_ONLINE;
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}
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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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};
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DEFINE_STRING_TABLE_LOOKUP(user_state, UserState);
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