src/logind-user.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2011 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU General Public License as published by
  10   the Free Software Foundation; either version 2 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   General Public License for more details.
  17
  18   You should have received a copy of the GNU General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <string.h>
  23 #include <unistd.h>
  24 #include <errno.h>
  25
  26 #include "logind-user.h"
  27 #include "util.h"
  28 #include "cgroup-util.h"
  29 #include "hashmap.h"
  30 #include "strv.h"
  31
  32 User* user_new(Manager *m, uid_t uid, gid_t gid, const char *name) {
  33         User *u;
  34
  35         assert(m);
  36         assert(name);
  37
  38         u = new0(User, 1);
  39         if (!u)
  40                 return NULL;
  41
  42         u->name = strdup(name);
  43         if (!u->name) {
  44                 free(u);
  45                 return NULL;
  46         }
  47
  48         if (asprintf(&u->state_file, "/run/systemd/user/%lu", (unsigned long) uid) < 0) {
  49                 free(u->name);
  50                 free(u);
  51                 return NULL;
  52         }
  53
  54         if (hashmap_put(m->users, ULONG_TO_PTR((unsigned long) uid), u) < 0) {
  55                 free(u->state_file);
  56                 free(u->name);
  57                 free(u);
  58                 return NULL;
  59         }
  60
  61         u->manager = m;
  62         u->uid = uid;
  63         u->gid = gid;
  64
  65         return u;
  66 }
  67
  68 void user_free(User *u) {
  69         assert(u);
  70
  71         if (u->in_gc_queue)
  72                 LIST_REMOVE(User, gc_queue, u->manager->user_gc_queue, u);
  73
  74         while (u->sessions)
  75                 session_free(u->sessions);
  76
  77         free(u->cgroup_path);
  78
  79         free(u->service);
  80         free(u->runtime_path);
  81
  82         hashmap_remove(u->manager->users, ULONG_TO_PTR((unsigned long) u->uid));
  83
  84         free(u->name);
  85
  86         if (u->state_file) {
  87                 unlink(u->state_file);
  88                 free(u->state_file);
  89         }
  90
  91         free(u);
  92 }
  93
  94 int user_save(User *u) {
  95         FILE *f;
  96         int r;
  97         char *temp_path;
  98
  99         assert(u);
 100         assert(u->state_file);
 101
 102         r = safe_mkdir("/run/systemd/user", 0755, 0, 0);
 103         if (r < 0)
 104                 goto finish;
 105
 106         r = fopen_temporary(u->state_file, &f, &temp_path);
 107         if (r < 0)
 108                 goto finish;
 109
 110         fchmod(fileno(f), 0644);
 111
 112         fprintf(f,
 113                 "# This is private data. Do not parse.\n"
 114                 "NAME=%s\n"
 115                 "STATE=%s\n",
 116                 u->name,
 117                 user_state_to_string(user_get_state(u)));
 118
 119         if (u->cgroup_path)
 120                 fprintf(f,
 121                         "CGROUP=%s\n",
 122                         u->cgroup_path);
 123
 124         if (u->runtime_path)
 125                 fprintf(f,
 126                         "RUNTIME=%s\n",
 127                         u->runtime_path);
 128
 129         if (u->service)
 130                 fprintf(f,
 131                         "SERVICE=%s\n",
 132                         u->service);
 133
 134         if (u->display)
 135                 fprintf(f,
 136                         "DISPLAY=%s\n",
 137                         u->display->id);
 138
 139         fflush(f);
 140
 141         if (ferror(f) || rename(temp_path, u->state_file) < 0) {
 142                 r = -errno;
 143                 unlink(u->state_file);
 144                 unlink(temp_path);
 145         }
 146
 147         fclose(f);
 148         free(temp_path);
 149
 150 finish:
 151         if (r < 0)
 152                 log_error("Failed to save user data for %s: %s", u->name, strerror(-r));
 153
 154         return r;
 155 }
 156
 157 int user_load(User *u) {
 158         int r;
 159         char *display = NULL;
 160         Session *s;
 161
 162         assert(u);
 163
 164         r = parse_env_file(u->state_file, "r",
 165                            "CGROUP", &u->cgroup_path,
 166                            "RUNTIME", &u->runtime_path,
 167                            "SERVICE", &u->service,
 168                            "DISPLAY", &display,
 169                            NULL);
 170         if (r < 0) {
 171                 free(display);
 172
 173                 if (r == -ENOENT)
 174                         return 0;
 175
 176                 log_error("Failed to read %s: %s", u->state_file, strerror(-r));
 177                 return r;
 178         }
 179
 180         s = hashmap_get(u->manager->sessions, display);
 181         free(display);
 182
 183         if (s && s->display && x11_display_is_local(s->display))
 184                 u->display = s;
 185
 186         return r;
 187 }
 188
 189 static int user_mkdir_runtime_path(User *u) {
 190         char *p;
 191         int r;
 192
 193         assert(u);
 194
 195         r = safe_mkdir("/run/user", 0755, 0, 0);
 196         if (r < 0) {
 197                 log_error("Failed to create /run/user: %s", strerror(-r));
 198                 return r;
 199         }
 200
 201         if (!u->runtime_path) {
 202                 p = strappend("/run/user/", u->name);
 203
 204                 if (!p) {
 205                         log_error("Out of memory");
 206                         return -ENOMEM;
 207                 }
 208         } else
 209                 p = u->runtime_path;
 210
 211         r = safe_mkdir(p, 0700, u->uid, u->gid);
 212         if (r < 0) {
 213                 log_error("Failed to create runtime directory %s: %s", p, strerror(-r));
 214                 free(p);
 215                 u->runtime_path = NULL;
 216                 return r;
 217         }
 218
 219         u->runtime_path = p;
 220         return 0;
 221 }
 222
 223 static int user_create_cgroup(User *u) {
 224         char **k;
 225         char *p;
 226         int r;
 227
 228         assert(u);
 229
 230         if (!u->cgroup_path) {
 231                 if (asprintf(&p, "%s/%s", u->manager->cgroup_path, u->name) < 0) {
 232                         log_error("Out of memory");
 233                         return -ENOMEM;
 234                 }
 235         } else
 236                 p = u->cgroup_path;
 237
 238         r = cg_create(SYSTEMD_CGROUP_CONTROLLER, p);
 239         if (r < 0) {
 240                 free(p);
 241                 u->cgroup_path = NULL;
 242                 log_error("Failed to create cgroup "SYSTEMD_CGROUP_CONTROLLER":%s: %s", p, strerror(-r));
 243                 return r;
 244         }
 245
 246         u->cgroup_path = p;
 247
 248         STRV_FOREACH(k, u->manager->controllers) {
 249                 r = cg_create(*k, p);
 250                 if (r < 0)
 251                         log_warning("Failed to create cgroup %s:%s: %s", *k, p, strerror(-r));
 252         }
 253
 254         return 0;
 255 }
 256
 257 static int user_start_service(User *u) {
 258         assert(u);
 259
 260         return 0;
 261 }
 262
 263 int user_start(User *u) {
 264         int r;
 265
 266         assert(u);
 267
 268         /* Make XDG_RUNTIME_DIR */
 269         r = user_mkdir_runtime_path(u);
 270         if (r < 0)
 271                 return r;
 272
 273         /* Create cgroup */
 274         r = user_create_cgroup(u);
 275         if (r < 0)
 276                 return r;
 277
 278         /* Spawn user systemd */
 279         r = user_start_service(u);
 280         if (r < 0)
 281                 return r;
 282
 283         /* Save new user data */
 284         user_save(u);
 285
 286         dual_timestamp_get(&u->timestamp);
 287
 288         return 0;
 289 }
 290
 291 static int user_stop_service(User *u) {
 292         assert(u);
 293
 294         if (!u->service)
 295                 return 0;
 296
 297         return 0;
 298 }
 299
 300 static int user_shall_kill(User *u) {
 301         assert(u);
 302
 303         return u->manager->kill_user_processes;
 304 }
 305
 306 static int user_kill_cgroup(User *u) {
 307         int r;
 308         char **k;
 309
 310         assert(u);
 311
 312         if (!u->cgroup_path)
 313                 return 0;
 314
 315         cg_trim(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, false);
 316
 317         if (user_shall_kill(u)) {
 318
 319                 r = cg_kill_recursive_and_wait(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, true);
 320                 if (r < 0)
 321                         log_error("Failed to kill user cgroup: %s", strerror(-r));
 322         } else {
 323
 324                 r = cg_is_empty_recursive(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, true);
 325                 if (r < 0)
 326                         log_error("Failed to check user cgroup: %s", strerror(-r));
 327                 else if (r > 0) {
 328                         r = cg_delete(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path);
 329                         if (r < 0)
 330                                 log_error("Failed to delete user cgroup: %s", strerror(-r));
 331                 } else
 332                         r = -EBUSY;
 333         }
 334
 335         STRV_FOREACH(k, u->manager->controllers)
 336                 cg_trim(*k, u->cgroup_path, true);
 337
 338         free(u->cgroup_path);
 339         u->cgroup_path = NULL;
 340
 341         return r;
 342 }
 343
 344 static int user_remove_runtime_path(User *u) {
 345         int r;
 346
 347         assert(u);
 348
 349         if (!u->runtime_path)
 350                 return 0;
 351
 352         r = rm_rf(u->runtime_path, false, true);
 353         if (r < 0)
 354                 log_error("Failed to remove runtime directory %s: %s", u->runtime_path, strerror(-r));
 355
 356         free(u->runtime_path);
 357         u->runtime_path = NULL;
 358
 359         return r;
 360 }
 361
 362 int user_stop(User *u) {
 363         Session *s;
 364         int r = 0, k;
 365         assert(u);
 366
 367         LIST_FOREACH(sessions_by_user, s, u->sessions) {
 368                 k = session_stop(s);
 369                 if (k < 0)
 370                         r = k;
 371         }
 372
 373         /* Kill systemd */
 374         k = user_stop_service(u);
 375         if (k < 0)
 376                 r = k;
 377
 378         /* Kill cgroup */
 379         k = user_kill_cgroup(u);
 380         if (k < 0)
 381                 r = k;
 382
 383         /* Kill XDG_RUNTIME_DIR */
 384         k = user_remove_runtime_path(u);
 385         if (k < 0)
 386                 r = k;
 387
 388         return r;
 389 }
 390
 391 int user_check_gc(User *u) {
 392         int r;
 393         char *p;
 394
 395         assert(u);
 396
 397         if (u->sessions)
 398                 return 1;
 399
 400         if (asprintf(&p, "/var/lib/systemd/linger/%s", u->name) < 0)
 401                 return -ENOMEM;
 402
 403         r = access(p, F_OK) >= 0;
 404         free(p);
 405
 406         if (r > 0)
 407                 return 1;
 408
 409         if (u->cgroup_path) {
 410                 r = cg_is_empty_recursive(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, false);
 411                 if (r < 0)
 412                         return r;
 413
 414                 if (r <= 0)
 415                         return 1;
 416         }
 417
 418         return 0;
 419 }
 420
 421 void user_add_to_gc_queue(User *u) {
 422         assert(u);
 423
 424         if (u->in_gc_queue)
 425                 return;
 426
 427         LIST_PREPEND(User, gc_queue, u->manager->user_gc_queue, u);
 428         u->in_gc_queue = true;
 429 }
 430
 431 UserState user_get_state(User *u) {
 432         Session *i;
 433
 434         assert(u);
 435
 436         if (!u->sessions)
 437                 return USER_LINGERING;
 438
 439         LIST_FOREACH(sessions_by_user, i, u->sessions)
 440                 if (session_is_active(i))
 441                         return USER_ACTIVE;
 442
 443         return USER_ONLINE;
 444 }
 445
 446 static const char* const user_state_table[_USER_STATE_MAX] = {
 447         [USER_OFFLINE] = "offline",
 448         [USER_LINGERING] = "lingering",
 449         [USER_ONLINE] = "online",
 450         [USER_ACTIVE] = "active"
 451 };
 452
 453 DEFINE_STRING_TABLE_LOOKUP(user_state, UserState);