src/login/logind-user-dbus.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 Lesser General Public License as published by
  10   the Free Software Foundation; either version 2.1 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   Lesser General Public License for more details.
  17
  18   You should have received a copy of the GNU Lesser General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <errno.h>
  23 #include <string.h>
  24 #include <sys/capability.h>
  25
  26 #include "strv.h"
  27 #include "bus-util.h"
  28 #include "logind.h"
  29 #include "logind-user.h"
  30
  31 static int property_get_display(
  32                 sd_bus *bus,
  33                 const char *path,
  34                 const char *interface,
  35                 const char *property,
  36                 sd_bus_message *reply,
  37                 void *userdata,
  38                 sd_bus_error *error) {
  39
  40         _cleanup_free_ char *p = NULL;
  41         User *u = userdata;
  42
  43         assert(bus);
  44         assert(reply);
  45         assert(u);
  46
  47         p = u->display ? session_bus_path(u->display) : strdup("/");
  48         if (!p)
  49                 return -ENOMEM;
  50
  51         return sd_bus_message_append(reply, "(so)", u->display ? u->display->id : "", p);
  52 }
  53
  54 static int property_get_state(
  55                 sd_bus *bus,
  56                 const char *path,
  57                 const char *interface,
  58                 const char *property,
  59                 sd_bus_message *reply,
  60                 void *userdata,
  61                 sd_bus_error *error) {
  62
  63         User *u = userdata;
  64
  65         assert(bus);
  66         assert(reply);
  67         assert(u);
  68
  69         return sd_bus_message_append(reply, "s", user_state_to_string(user_get_state(u)));
  70 }
  71
  72 static int property_get_sessions(
  73                 sd_bus *bus,
  74                 const char *path,
  75                 const char *interface,
  76                 const char *property,
  77                 sd_bus_message *reply,
  78                 void *userdata,
  79                 sd_bus_error *error) {
  80
  81         User *u = userdata;
  82         Session *session;
  83         int r;
  84
  85         assert(bus);
  86         assert(reply);
  87         assert(u);
  88
  89         r = sd_bus_message_open_container(reply, 'a', "(so)");
  90         if (r < 0)
  91                 return r;
  92
  93         LIST_FOREACH(sessions_by_user, session, u->sessions) {
  94                 _cleanup_free_ char *p = NULL;
  95
  96                 p = session_bus_path(session);
  97                 if (!p)
  98                         return -ENOMEM;
  99
 100                 r = sd_bus_message_append(reply, "(so)", session->id, p);
 101                 if (r < 0)
 102                         return r;
 103
 104         }
 105
 106         r = sd_bus_message_close_container(reply);
 107         if (r < 0)
 108                 return r;
 109
 110         return 1;
 111 }
 112
 113 static int property_get_idle_hint(
 114                 sd_bus *bus,
 115                 const char *path,
 116                 const char *interface,
 117                 const char *property,
 118                 sd_bus_message *reply,
 119                 void *userdata,
 120                 sd_bus_error *error) {
 121
 122         User *u = userdata;
 123
 124         assert(bus);
 125         assert(reply);
 126         assert(u);
 127
 128         return sd_bus_message_append(reply, "b", user_get_idle_hint(u, NULL) > 0);
 129 }
 130
 131 static int property_get_idle_since_hint(
 132                 sd_bus *bus,
 133                 const char *path,
 134                 const char *interface,
 135                 const char *property,
 136                 sd_bus_message *reply,
 137                 void *userdata,
 138                 sd_bus_error *error) {
 139
 140         User *u = userdata;
 141         dual_timestamp t;
 142         uint64_t k;
 143
 144         assert(bus);
 145         assert(reply);
 146         assert(u);
 147
 148         user_get_idle_hint(u, &t);
 149         k = streq(property, "IdleSinceHint") ? t.realtime : t.monotonic;
 150
 151         return sd_bus_message_append(reply, "t", k);
 152 }
 153
 154 static int property_get_linger(
 155                 sd_bus *bus,
 156                 const char *path,
 157                 const char *interface,
 158                 const char *property,
 159                 sd_bus_message *reply,
 160                 void *userdata,
 161                 sd_bus_error *error) {
 162
 163         User *u = userdata;
 164         int r;
 165
 166         assert(bus);
 167         assert(reply);
 168         assert(u);
 169
 170         r = user_check_linger_file(u);
 171
 172         return sd_bus_message_append(reply, "b", r > 0);
 173 }
 174
 175 static int method_terminate(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
 176         User *u = userdata;
 177         int r;
 178
 179         assert(bus);
 180         assert(message);
 181         assert(u);
 182
 183         r = user_stop(u, true);
 184         if (r < 0)
 185                 return r;
 186
 187         return sd_bus_reply_method_return(message, NULL);
 188 }
 189
 190 static int method_kill(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
 191         User *u = userdata;
 192         int32_t signo;
 193         int r;
 194
 195         assert(bus);
 196         assert(message);
 197         assert(u);
 198
 199         r = sd_bus_message_read(message, "i", &signo);
 200         if (r < 0)
 201                 return r;
 202
 203         if (signo <= 0 || signo >= _NSIG)
 204                 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid signal %i", signo);
 205
 206         r = user_kill(u, signo);
 207         if (r < 0)
 208                 return r;
 209
 210         return sd_bus_reply_method_return(message, NULL);
 211 }
 212
 213 const sd_bus_vtable user_vtable[] = {
 214         SD_BUS_VTABLE_START(0),
 215
 216         SD_BUS_PROPERTY("UID", "u", bus_property_get_uid, offsetof(User, uid), SD_BUS_VTABLE_PROPERTY_CONST),
 217         SD_BUS_PROPERTY("GID", "u", bus_property_get_gid, offsetof(User, gid), SD_BUS_VTABLE_PROPERTY_CONST),
 218         SD_BUS_PROPERTY("Name", "s", NULL, offsetof(User, name), SD_BUS_VTABLE_PROPERTY_CONST),
 219         BUS_PROPERTY_DUAL_TIMESTAMP("Timestamp", offsetof(User, timestamp), SD_BUS_VTABLE_PROPERTY_CONST),
 220         SD_BUS_PROPERTY("RuntimePath", "s", NULL, offsetof(User, runtime_path), SD_BUS_VTABLE_PROPERTY_CONST),
 221         SD_BUS_PROPERTY("Service", "s", NULL, offsetof(User, service), SD_BUS_VTABLE_PROPERTY_CONST),
 222         SD_BUS_PROPERTY("Slice", "s", NULL, offsetof(User, slice), SD_BUS_VTABLE_PROPERTY_CONST),
 223         SD_BUS_PROPERTY("Display", "(so)", property_get_display, 0, SD_BUS_VTABLE_PROPERTY_CONST),
 224         SD_BUS_PROPERTY("State", "s", property_get_state, 0, 0),
 225         SD_BUS_PROPERTY("Sessions", "a(so)", property_get_sessions, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 226         SD_BUS_PROPERTY("IdleHint", "b", property_get_idle_hint, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 227         SD_BUS_PROPERTY("IdleSinceHint", "t", property_get_idle_since_hint, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 228         SD_BUS_PROPERTY("IdleSinceHintMonotonic", "t", property_get_idle_since_hint, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 229         SD_BUS_PROPERTY("Linger", "b", property_get_linger, 0, 0),
 230
 231         SD_BUS_METHOD("Terminate", NULL, NULL, method_terminate, SD_BUS_VTABLE_CAPABILITY(CAP_KILL)),
 232         SD_BUS_METHOD("Kill", "i", NULL, method_kill, SD_BUS_VTABLE_CAPABILITY(CAP_KILL)),
 233
 234         SD_BUS_VTABLE_END
 235 };
 236
 237 int user_object_find(sd_bus *bus, const char *path, const char *interface, void *userdata, void **found, sd_bus_error *error) {
 238         Manager *m = userdata;
 239         User *user;
 240         int r;
 241
 242         assert(bus);
 243         assert(path);
 244         assert(interface);
 245         assert(found);
 246         assert(m);
 247
 248         if (streq(path, "/org/freedesktop/login1/user/self")) {
 249                 _cleanup_bus_creds_unref_ sd_bus_creds *creds = NULL;
 250                 sd_bus_message *message;
 251                 pid_t pid;
 252
 253                 message = sd_bus_get_current(bus);
 254                 if (!message)
 255                         return 0;
 256
 257                 r = sd_bus_query_sender_creds(message, SD_BUS_CREDS_PID, &creds);
 258                 if (r < 0)
 259                         return r;
 260
 261                 r = sd_bus_creds_get_pid(creds, &pid);
 262                 if (r < 0)
 263                         return r;
 264
 265                 r = manager_get_user_by_pid(m, pid, &user);
 266                 if (r <= 0)
 267                         return 0;
 268         } else {
 269                 unsigned long lu;
 270                 const char *p;
 271
 272                 p = startswith(path, "/org/freedesktop/login1/user/_");
 273                 if (!p)
 274                         return 0;
 275
 276                 r = safe_atolu(p, &lu);
 277                 if (r < 0)
 278                         return 0;
 279
 280                 user = hashmap_get(m->users, ULONG_TO_PTR(lu));
 281                 if (!user)
 282                         return 0;
 283         }
 284
 285         *found = user;
 286         return 1;
 287 }
 288
 289 char *user_bus_path(User *u) {
 290         char *s;
 291
 292         assert(u);
 293
 294         if (asprintf(&s, "/org/freedesktop/login1/user/_%llu", (unsigned long long) u->uid) < 0)
 295                 return NULL;
 296
 297         return s;
 298 }
 299
 300 int user_node_enumerator(sd_bus *bus, const char *path, void *userdata, char ***nodes, sd_bus_error *error) {
 301         _cleanup_strv_free_ char **l = NULL;
 302         Manager *m = userdata;
 303         User *user;
 304         Iterator i;
 305         int r;
 306
 307         assert(bus);
 308         assert(path);
 309         assert(nodes);
 310
 311         HASHMAP_FOREACH(user, m->users, i) {
 312                 char *p;
 313
 314                 p = user_bus_path(user);
 315                 if (!p)
 316                         return -ENOMEM;
 317
 318                 r = strv_consume(&l, p);
 319                 if (r < 0)
 320                         return r;
 321         }
 322
 323         *nodes = l;
 324         l = NULL;
 325
 326         return 1;
 327 }
 328
 329 int user_send_signal(User *u, bool new_user) {
 330         _cleanup_free_ char *p = NULL;
 331
 332         assert(u);
 333
 334         p = user_bus_path(u);
 335         if (!p)
 336                 return -ENOMEM;
 337
 338         return sd_bus_emit_signal(
 339                         u->manager->bus,
 340                         "/org/freedesktop/login1",
 341                         "org.freedesktop.login1.Manager",
 342                         new_user ? "UserNew" : "UserRemoved",
 343                         "uo", (uint32_t) u->uid, p);
 344 }
 345
 346 int user_send_changed(User *u, const char *properties, ...) {
 347         _cleanup_free_ char *p = NULL;
 348         char **l;
 349
 350         assert(u);
 351
 352         if (!u->started)
 353                 return 0;
 354
 355         p = user_bus_path(u);
 356         if (!p)
 357                 return -ENOMEM;
 358
 359         l = strv_from_stdarg_alloca(properties);
 360
 361         return sd_bus_emit_properties_changed_strv(u->manager->bus, p, "org.freedesktop.login1.User", l);
 362 }