src/login/logind-seat-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 "util.h"
  27 #include "bus-util.h"
  28 #include "strv.h"
  29 #include "bus-errors.h"
  30 #include "logind.h"
  31 #include "logind-seat.h"
  32
  33 static int property_get_active_session(
  34                 sd_bus *bus,
  35                 const char *path,
  36                 const char *interface,
  37                 const char *property,
  38                 sd_bus_message *reply,
  39                 void *userdata,
  40                 sd_bus_error *error) {
  41
  42         _cleanup_free_ char *p = NULL;
  43         Seat *s = userdata;
  44
  45         assert(bus);
  46         assert(reply);
  47         assert(s);
  48
  49         p = s->active ? session_bus_path(s->active) : strdup("/");
  50         if (!p)
  51                 return -ENOMEM;
  52
  53         return sd_bus_message_append(reply, "(so)", s->active ? s->active->id : "", p);
  54 }
  55
  56 static int property_get_can_multi_session(
  57                 sd_bus *bus,
  58                 const char *path,
  59                 const char *interface,
  60                 const char *property,
  61                 sd_bus_message *reply,
  62                 void *userdata,
  63                 sd_bus_error *error) {
  64
  65         Seat *s = userdata;
  66
  67         assert(bus);
  68         assert(reply);
  69         assert(s);
  70
  71         return sd_bus_message_append(reply, "b", seat_can_multi_session(s));
  72 }
  73
  74 static int property_get_can_tty(
  75                 sd_bus *bus,
  76                 const char *path,
  77                 const char *interface,
  78                 const char *property,
  79                 sd_bus_message *reply,
  80                 void *userdata,
  81                 sd_bus_error *error) {
  82
  83         Seat *s = userdata;
  84
  85         assert(bus);
  86         assert(reply);
  87         assert(s);
  88
  89         return sd_bus_message_append(reply, "b", seat_can_tty(s));
  90 }
  91
  92 static int property_get_can_graphical(
  93                 sd_bus *bus,
  94                 const char *path,
  95                 const char *interface,
  96                 const char *property,
  97                 sd_bus_message *reply,
  98                 void *userdata,
  99                 sd_bus_error *error) {
 100
 101         Seat *s = userdata;
 102
 103         assert(bus);
 104         assert(reply);
 105         assert(s);
 106
 107         return sd_bus_message_append(reply, "b", seat_can_graphical(s));
 108 }
 109
 110 static int property_get_sessions(
 111                 sd_bus *bus,
 112                 const char *path,
 113                 const char *interface,
 114                 const char *property,
 115                 sd_bus_message *reply,
 116                 void *userdata,
 117                 sd_bus_error *error) {
 118
 119         Seat *s = userdata;
 120         Session *session;
 121         int r;
 122
 123         assert(bus);
 124         assert(reply);
 125         assert(s);
 126
 127         r = sd_bus_message_open_container(reply, 'a', "(so)");
 128         if (r < 0)
 129                 return r;
 130
 131         LIST_FOREACH(sessions_by_seat, session, s->sessions) {
 132                 _cleanup_free_ char *p = NULL;
 133
 134                 p = session_bus_path(session);
 135                 if (!p)
 136                         return -ENOMEM;
 137
 138                 r = sd_bus_message_append(reply, "(so)", session->id, p);
 139                 if (r < 0)
 140                         return r;
 141
 142         }
 143
 144         r = sd_bus_message_close_container(reply);
 145         if (r < 0)
 146                 return r;
 147
 148         return 1;
 149 }
 150
 151 static int property_get_idle_hint(
 152                 sd_bus *bus,
 153                 const char *path,
 154                 const char *interface,
 155                 const char *property,
 156                 sd_bus_message *reply,
 157                 void *userdata,
 158                 sd_bus_error *error) {
 159
 160         Seat *s = userdata;
 161
 162         assert(bus);
 163         assert(reply);
 164         assert(s);
 165
 166         return sd_bus_message_append(reply, "b", seat_get_idle_hint(s, NULL) > 0);
 167 }
 168
 169 static int property_get_idle_since_hint(
 170                 sd_bus *bus,
 171                 const char *path,
 172                 const char *interface,
 173                 const char *property,
 174                 sd_bus_message *reply,
 175                 void *userdata,
 176                 sd_bus_error *error) {
 177
 178         Seat *s = userdata;
 179         dual_timestamp t;
 180         uint64_t u;
 181         int r;
 182
 183         assert(bus);
 184         assert(reply);
 185         assert(s);
 186
 187         r = seat_get_idle_hint(s, &t);
 188         if (r < 0)
 189                 return r;
 190
 191         u = streq(property, "IdleSinceHint") ? t.realtime : t.monotonic;
 192
 193         return sd_bus_message_append(reply, "t", u);
 194 }
 195
 196 static int method_terminate(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
 197         Seat *s = userdata;
 198         int r;
 199
 200         assert(bus);
 201         assert(message);
 202         assert(s);
 203
 204         r = seat_stop_sessions(s);
 205         if (r < 0)
 206                 return r;
 207
 208         return sd_bus_reply_method_return(message, NULL);
 209 }
 210
 211 static int method_activate_session(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
 212         Seat *s = userdata;
 213         const char *name;
 214         Session *session;
 215         int r;
 216
 217         assert(bus);
 218         assert(message);
 219         assert(s);
 220
 221         r = sd_bus_message_read(message, "s", &name);
 222         if (r < 0)
 223                 return r;
 224
 225         session = hashmap_get(s->manager->sessions, name);
 226         if (!session)
 227                 return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_SESSION, "No session '%s' known", name);
 228
 229         if (session->seat != s)
 230                 return sd_bus_error_setf(error, BUS_ERROR_SESSION_NOT_ON_SEAT, "Session %s not on seat %s", name, s->id);
 231
 232         r = session_activate(session);
 233         if (r < 0)
 234                 return r;
 235
 236         return sd_bus_reply_method_return(message, NULL);
 237 }
 238
 239 const sd_bus_vtable seat_vtable[] = {
 240         SD_BUS_VTABLE_START(0),
 241
 242         SD_BUS_PROPERTY("Id", "s", NULL, offsetof(Seat, id), 0),
 243         SD_BUS_PROPERTY("ActiveSession", "(so)", property_get_active_session, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 244         SD_BUS_PROPERTY("CanMultiSession", "b", property_get_can_multi_session, 0, 0),
 245         SD_BUS_PROPERTY("CanTTY", "b", property_get_can_tty, 0, 0),
 246         SD_BUS_PROPERTY("CanGraphical", "b", property_get_can_graphical, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 247         SD_BUS_PROPERTY("Sessions", "a(so)", property_get_sessions, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 248         SD_BUS_PROPERTY("IdleHint", "b", property_get_idle_hint, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 249         SD_BUS_PROPERTY("IdleSinceHint", "t", property_get_idle_since_hint, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 250         SD_BUS_PROPERTY("IdleSinceHintMonotonic", "t", property_get_idle_since_hint, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 251
 252         SD_BUS_METHOD("Terminate", NULL, NULL, method_terminate, SD_BUS_VTABLE_CAPABILITY(CAP_KILL)),
 253         SD_BUS_METHOD("ActivateSession", "s", NULL, method_activate_session, SD_BUS_VTABLE_UNPRIVILEGED),
 254
 255         SD_BUS_VTABLE_END
 256 };
 257
 258 int seat_object_find(sd_bus *bus, const char *path, const char *interface, void *userdata, void **found, sd_bus_error *error) {
 259         Manager *m = userdata;
 260         Seat *seat;
 261         int r;
 262
 263         assert(bus);
 264         assert(path);
 265         assert(interface);
 266         assert(found);
 267         assert(m);
 268
 269         if (streq(path, "/org/freedesktop/login1/seat/self")) {
 270                 _cleanup_bus_creds_unref_ sd_bus_creds *creds = NULL;
 271                 sd_bus_message *message;
 272                 Session *session;
 273                 pid_t pid;
 274
 275                 message = sd_bus_get_current(bus);
 276                 if (!message)
 277                         return 0;
 278
 279                 r = sd_bus_query_sender_creds(message, SD_BUS_CREDS_PID, &creds);
 280                 if (r < 0)
 281                         return r;
 282
 283                 r = sd_bus_creds_get_pid(creds, &pid);
 284                 if (r < 0)
 285                         return r;
 286
 287                 r = manager_get_session_by_pid(m, pid, &session);
 288                 if (r <= 0)
 289                         return 0;
 290
 291                 if (!session->seat)
 292                         return 0;
 293
 294                 seat = session->seat;
 295         } else {
 296                 _cleanup_free_ char *e = NULL;
 297                 const char *p;
 298
 299                 p = startswith(path, "/org/freedesktop/login1/seat/");
 300                 if (!p)
 301                         return 0;
 302
 303                 e = sd_bus_label_unescape(p);
 304                 if (!e)
 305                         return -ENOMEM;
 306
 307                 seat = hashmap_get(m->seats, e);
 308                 if (!seat)
 309                         return 0;
 310         }
 311
 312         *found = seat;
 313         return 1;
 314 }
 315
 316 char *seat_bus_path(Seat *s) {
 317         _cleanup_free_ char *t = NULL;
 318
 319         assert(s);
 320
 321         t = sd_bus_label_escape(s->id);
 322         if (!t)
 323                 return NULL;
 324
 325         return strappend("/org/freedesktop/login1/seat/", t);
 326 }
 327
 328 int seat_node_enumerator(sd_bus *bus, const char *path, void *userdata, char ***nodes, sd_bus_error *error) {
 329         _cleanup_strv_free_ char **l = NULL;
 330         Manager *m = userdata;
 331         Seat *seat;
 332         Iterator i;
 333         int r;
 334
 335         assert(bus);
 336         assert(path);
 337         assert(nodes);
 338
 339         HASHMAP_FOREACH(seat, m->seats, i) {
 340                 char *p;
 341
 342                 p = seat_bus_path(seat);
 343                 if (!p)
 344                         return -ENOMEM;
 345
 346                 r = strv_push(&l, p);
 347                 if (r < 0) {
 348                         free(p);
 349                         return r;
 350                 }
 351         }
 352
 353         *nodes = l;
 354         l = NULL;
 355
 356         return 1;
 357 }
 358
 359 int seat_send_signal(Seat *s, bool new_seat) {
 360         _cleanup_free_ char *p = NULL;
 361
 362         assert(s);
 363
 364         p = seat_bus_path(s);
 365         if (!p)
 366                 return -ENOMEM;
 367
 368         return sd_bus_emit_signal(
 369                         s->manager->bus,
 370                         "/org/freedesktop/login1",
 371                         "org.freedesktop.login1.Manager",
 372                         new_seat ? "SeatNew" : "SeatRemoved",
 373                         "so", s->id, p);
 374 }
 375
 376 int seat_send_changed(Seat *s, const char *properties, ...) {
 377         _cleanup_free_ char *p = NULL;
 378         char **l;
 379
 380         assert(s);
 381
 382         if (!s->started)
 383                 return 0;
 384
 385         p = seat_bus_path(s);
 386         if (!p)
 387                 return -ENOMEM;
 388
 389         l = strv_from_stdarg_alloca(properties);
 390
 391         return sd_bus_emit_properties_changed_strv(s->manager->bus, p, "org.freedesktop.login1.Seat", l);
 392 }