src/bus-driverd/bus-driverd.c

   1 /***
   2   This file is part of systemd.
   3
   4   Copyright 2013 Daniel Mack
   5
   6   systemd is free software; you can redistribute it and/or modify it
   7   under the terms of the GNU Lesser General Public License as published by
   8   the Free Software Foundation; either version 2.1 of the License, or
   9   (at your option) any later version.
  10
  11   systemd is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   Lesser General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  18 ***/
  19
  20 #include <stdlib.h>
  21 #include <stdbool.h>
  22 #include <unistd.h>
  23 #include <getopt.h>
  24 #include <locale.h>
  25 #include <string.h>
  26 #include <poll.h>
  27 #include <netdb.h>
  28 #include <sys/socket.h>
  29 #include <sys/un.h>
  30 #include <sys/timex.h>
  31 #include <sys/utsname.h>
  32 #include <unistd.h>
  33
  34 #include "kdbus.h"
  35 #include "sd-bus.h"
  36 #include "bus-internal.h"
  37 #include "sd-daemon.h"
  38 #include "sd-event.h"
  39 #include "event-util.h"
  40 #include "bus-util.h"
  41 #include "bus-error.h"
  42 #include "bus-message.h"
  43 #include "bus-kernel.h"
  44 #include "socket-util.h"
  45 #include "util.h"
  46 #include "build.h"
  47 #include "strv.h"
  48 #include "sd-id128.h"
  49 #include "async.h"
  50 #include "hashmap.h"
  51 #include "def.h"
  52 #include "unit-name.h"
  53 #include "bus-control.h"
  54
  55 #define CLIENTS_MAX 1024
  56 #define MATCHES_MAX 1024
  57
  58 typedef struct Match Match;
  59 typedef struct Client Client;
  60 typedef struct Context Context;
  61
  62 struct Match {
  63         Client *client;
  64         char *match;
  65         uint64_t cookie;
  66         LIST_FIELDS(Match, matches);
  67 };
  68
  69 struct Client {
  70         Context *context;
  71         uint64_t id;
  72         uint64_t next_cookie;
  73         Hashmap *matches;
  74         unsigned n_matches;
  75         char *watch;
  76 };
  77
  78 struct Context {
  79         sd_bus *bus;
  80         sd_event *event;
  81         Hashmap *clients;
  82 };
  83
  84 static void match_free(Match *m) {
  85
  86         if (!m)
  87                 return;
  88
  89         if (m->client) {
  90                 Match *first;
  91
  92                 first = hashmap_get(m->client->matches, m->match);
  93                 LIST_REMOVE(matches, first, m);
  94                 if (first)
  95                         assert_se(hashmap_replace(m->client->matches, m->match, first) >= 0);
  96                 else
  97                         hashmap_remove(m->client->matches, m->match);
  98
  99                 m->client->n_matches--;
 100         }
 101
 102         free(m->match);
 103         free(m);
 104 }
 105
 106 static int match_new(Client *c, struct bus_match_component *components, unsigned n_components, Match **_m) {
 107         Match *m, *first;
 108         int r;
 109
 110         assert(c);
 111         assert(_m);
 112
 113         r = hashmap_ensure_allocated(&c->matches, string_hash_func, string_compare_func);
 114         if (r < 0)
 115                 return r;
 116
 117         m = new0(Match, 1);
 118         if (!m)
 119                 return -ENOMEM;
 120
 121         m->match = bus_match_to_string(components, n_components);
 122         if (!m->match) {
 123                 r = -ENOMEM;
 124                 goto fail;
 125         }
 126
 127         m->cookie = ++c->next_cookie;
 128
 129         first = hashmap_get(c->matches, m->match);
 130         LIST_PREPEND(matches, first, m);
 131         r = hashmap_replace(c->matches, m->match, first);
 132         if (r < 0) {
 133                 LIST_REMOVE(matches, first, m);
 134                 goto fail;
 135         }
 136
 137         m->client = c;
 138         c->n_matches++;
 139
 140         *_m = m;
 141         m = NULL;
 142
 143         return 0;
 144
 145 fail:
 146         match_free(m);
 147         return r;
 148 }
 149
 150 static int on_name_owner_changed(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *error);
 151
 152 static void client_free(Client *c) {
 153         Match *m;
 154
 155         if (!c)
 156                 return;
 157
 158         if (c->context) {
 159                 if (c->watch)
 160                         sd_bus_remove_match(c->context->bus, c->watch, on_name_owner_changed, c);
 161
 162                 assert_se(hashmap_remove(c->context->clients, &c->id) == c);
 163         }
 164
 165         while ((m = hashmap_first(c->matches)))
 166                 match_free(m);
 167
 168         hashmap_free(c->matches);
 169         free(c->watch);
 170
 171         free(c);
 172 }
 173
 174 static int on_name_owner_changed(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *error) {
 175         Client *c = userdata;
 176
 177         assert(bus);
 178         assert(m);
 179
 180         client_free(c);
 181         return 0;
 182 }
 183
 184 static int client_acquire(Context *context, uint64_t id, Client **_c) {
 185         char *watch = NULL;
 186         Client *c;
 187         int r;
 188
 189         assert(context);
 190         assert(_c);
 191
 192         c = hashmap_get(context->clients, &id);
 193         if (c) {
 194                 *_c = c;
 195                 return 0;
 196         }
 197
 198         if (hashmap_size(context->clients) >= CLIENTS_MAX)
 199                 return -ENOBUFS;
 200
 201         r = hashmap_ensure_allocated(&context->clients, uint64_hash_func, uint64_compare_func);
 202         if (r < 0)
 203                 return r;
 204
 205         c = new0(Client, 1);
 206         if (!c)
 207                 return -ENOMEM;
 208
 209         c->id = id;
 210
 211         r = hashmap_put(context->clients, &c->id, c);
 212         if (r < 0)
 213                 goto fail;
 214
 215         c->context = context;
 216
 217         if (asprintf(&watch,
 218                      "type='signal',"
 219                      "sender='org.freedesktop.DBus',"
 220                      "path='/org/freedesktop/DBus',"
 221                      "interface='org.freedesktop.DBus',"
 222                      "member='NameOwnerChanged',"
 223                      "arg0=':1.%llu'", (unsigned long long) id) < 0) {
 224                 r = -ENOMEM;
 225                 goto fail;
 226         }
 227
 228         r = sd_bus_add_match(context->bus, watch, on_name_owner_changed, c);
 229         if (r < 0) {
 230                 free(watch);
 231                 goto fail;
 232         }
 233
 234         c->watch = watch;
 235
 236         *_c = c;
 237         return 0;
 238
 239 fail:
 240         client_free(c);
 241         return r;
 242 }
 243
 244 static int driver_add_match(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
 245
 246         struct bus_match_component *components = NULL;
 247         Context *context = userdata;
 248         unsigned n_components = 0;
 249         Match *m = NULL;
 250         Client *c = NULL;
 251         char *arg0;
 252         uint64_t id;
 253         int r;
 254
 255         assert(bus);
 256         assert(message);
 257         assert(context);
 258
 259         r = sd_bus_message_read(message, "s", &arg0);
 260         if (r < 0)
 261                 return r;
 262
 263         r = bus_kernel_parse_unique_name(message->sender, &id);
 264         if (r < 0)
 265                 return r;
 266
 267         r = client_acquire(context, id, &c);
 268         if (r == -ENOBUFS)
 269                 return sd_bus_error_setf(error, SD_BUS_ERROR_LIMITS_EXCEEDED, "Reached limit of %u clients", CLIENTS_MAX);
 270         if (r < 0)
 271                 return r;
 272
 273         if (c->n_matches >= MATCHES_MAX) {
 274                 r = sd_bus_error_setf(error, SD_BUS_ERROR_LIMITS_EXCEEDED, "Reached limit of %u matches per client", MATCHES_MAX);
 275                 goto fail;
 276         }
 277
 278         r = bus_match_parse(arg0, &components, &n_components);
 279         if (r < 0) {
 280                 r = sd_bus_error_setf(error, SD_BUS_ERROR_MATCH_RULE_INVALID, "Match rule \"%s\" is not valid", arg0);
 281                 goto fail;
 282         }
 283
 284         r = match_new(c, components, n_components, &m);
 285         if (r < 0)
 286                 goto fail;
 287
 288         r = bus_add_match_internal_kernel(bus, id, components, n_components, m->cookie);
 289         if (r < 0)
 290                 goto fail;
 291
 292         bus_match_parse_free(components, n_components);
 293
 294         return sd_bus_reply_method_return(message, NULL);
 295
 296 fail:
 297         bus_match_parse_free(components, n_components);
 298
 299         match_free(m);
 300
 301         if (c->n_matches <= 0)
 302                 client_free(c);
 303
 304         return r;
 305 }
 306
 307 static int driver_remove_match(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
 308
 309         struct bus_match_component *components = NULL;
 310         _cleanup_free_ char *normalized = NULL;
 311         Context *context = userdata;
 312         unsigned n_components = 0;
 313         Client *c = NULL;
 314         Match *m = NULL;
 315         char *arg0;
 316         uint64_t id;
 317         int r;
 318
 319         assert(bus);
 320         assert(message);
 321         assert(context);
 322
 323         r = sd_bus_message_read(message, "s", &arg0);
 324         if (r < 0)
 325                 return r;
 326
 327         r = bus_kernel_parse_unique_name(message->sender, &id);
 328         if (r < 0)
 329                 return r;
 330
 331         c = hashmap_get(context->clients, &id);
 332         if (!c)
 333                 return sd_bus_error_setf(error, SD_BUS_ERROR_MATCH_RULE_NOT_FOUND, "You have not registered any matches.");
 334
 335         r = bus_match_parse(arg0, &components, &n_components);
 336         if (r < 0) {
 337                 r = sd_bus_error_setf(error, SD_BUS_ERROR_MATCH_RULE_INVALID, "Match rule \"%s\" is not valid", arg0);
 338                 goto finish;
 339         }
 340
 341         normalized = bus_match_to_string(components, n_components);
 342         if (!normalized) {
 343                 r = -ENOMEM;
 344                 goto finish;
 345         }
 346
 347         m = hashmap_get(c->matches, normalized);
 348         if (!m) {
 349                 r = sd_bus_error_setf(error, SD_BUS_ERROR_MATCH_RULE_NOT_FOUND, "Match rule \"%s\" not found.");
 350                 goto finish;
 351         }
 352
 353         bus_remove_match_internal_kernel(bus, id, m->cookie);
 354         match_free(m);
 355
 356         r = sd_bus_reply_method_return(message, NULL);
 357
 358 finish:
 359         bus_match_parse_free(components, n_components);
 360
 361         if (c->n_matches <= 0)
 362                 client_free(c);
 363
 364         return r;
 365 }
 366
 367 static int driver_get_security_ctx(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *error) {
 368         _cleanup_bus_creds_unref_ sd_bus_creds *creds = NULL;
 369         _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
 370         char *arg0;
 371         int r;
 372
 373         r = sd_bus_message_read(m, "s", &arg0);
 374         if (r < 0)
 375                 return r;
 376
 377         assert_return(service_name_is_valid(arg0), -EINVAL);
 378
 379         r = sd_bus_get_owner(bus, arg0, SD_BUS_CREDS_SELINUX_CONTEXT, &creds);
 380         if (r == -ENOENT)
 381                 return sd_bus_error_setf(error, SD_BUS_ERROR_NAME_HAS_NO_OWNER, "Name %s is currently not owned by anyone.", arg0);
 382         if (r < 0)
 383                 return r;
 384
 385         r = sd_bus_message_new_method_return(m, &reply);
 386         if (r < 0)
 387                 return r;
 388
 389         r = sd_bus_message_append_array(reply, 'y', creds->label, strlen(creds->label));
 390         if (r < 0)
 391                 return r;
 392
 393         return sd_bus_send(bus, reply, NULL);
 394 }
 395
 396 static int driver_get_pid(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *error) {
 397         _cleanup_bus_creds_unref_ sd_bus_creds *creds = NULL;
 398         char *arg0;
 399         int r;
 400
 401         r = sd_bus_message_read(m, "s", &arg0);
 402         if (r < 0)
 403                 return r;
 404
 405         assert_return(service_name_is_valid(arg0), -EINVAL);
 406
 407         r = sd_bus_get_owner(bus, arg0, SD_BUS_CREDS_PID, &creds);
 408         if (r == -ENOENT)
 409                 return sd_bus_error_setf(error, SD_BUS_ERROR_NAME_HAS_NO_OWNER, "Name %s is currently not owned by anyone.", arg0);
 410         if (r < 0)
 411                 return r;
 412
 413         return sd_bus_reply_method_return(m, "u", creds->pid);
 414 }
 415
 416 static int driver_get_user(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *error) {
 417         _cleanup_bus_creds_unref_ sd_bus_creds *creds = NULL;
 418         char *arg0;
 419         int r;
 420
 421         r = sd_bus_message_read(m, "s", &arg0);
 422         if (r < 0)
 423                 return r;
 424
 425         assert_return(service_name_is_valid(arg0), -EINVAL);
 426
 427         r = sd_bus_get_owner(bus, arg0, SD_BUS_CREDS_UID, &creds);
 428         if (r == -ENOENT)
 429                 return sd_bus_error_setf(error, SD_BUS_ERROR_NAME_HAS_NO_OWNER, "Name %s is currently not owned by anyone.", arg0);
 430         if (r < 0)
 431                 return r;
 432
 433         return sd_bus_reply_method_return(m, "u", creds->uid);
 434 }
 435
 436 static int driver_get_id(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *error) {
 437         sd_id128_t server_id;
 438         char buf[SD_ID128_STRING_MAX];
 439         int r;
 440
 441         r = sd_bus_get_server_id(bus, &server_id);
 442         if (r < 0)
 443                 return r;
 444
 445         return sd_bus_reply_method_return(m, "s", sd_id128_to_string(server_id, buf));
 446 }
 447
 448 static int driver_get_name_owner(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *error) {
 449         _cleanup_bus_creds_unref_ sd_bus_creds *creds = NULL;
 450         char *arg0;
 451         int r;
 452
 453         r = sd_bus_message_read(m, "s", &arg0);
 454         if (r < 0)
 455                 return r;
 456
 457         assert_return(service_name_is_valid(arg0), -EINVAL);
 458
 459         r = sd_bus_get_owner(bus, arg0, SD_BUS_CREDS_UNIQUE_NAME, &creds);
 460         if (r == -ENOENT)
 461                 return sd_bus_error_setf(error, SD_BUS_ERROR_NAME_HAS_NO_OWNER, "Name %s is currently not owned by anyone.", arg0);
 462         if (r < 0)
 463                 return r;
 464
 465         return sd_bus_reply_method_return(m, "s", creds->unique_name);
 466 }
 467
 468 static int driver_hello(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *error) {
 469         return sd_bus_reply_method_return(m, "s", m->sender);
 470 }
 471
 472 static int return_strv(sd_bus *bus, sd_bus_message *m, char **l) {
 473         _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
 474         int r;
 475
 476         r = sd_bus_message_new_method_return(m, &reply);
 477         if (r < 0)
 478                 return r;
 479
 480         r = sd_bus_message_append_strv(reply, l);
 481         if (r < 0)
 482                 return r;
 483
 484         return sd_bus_send(bus, reply, NULL);
 485 }
 486
 487 static int driver_list_names(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *error) {
 488         _cleanup_strv_free_ char **names = NULL;
 489         int r;
 490
 491         r = sd_bus_list_names(bus, &names, NULL);
 492         if (r < 0)
 493                 return r;
 494
 495         /* Let's sort the names list to make it stable */
 496         strv_sort(names);
 497
 498         return return_strv(bus, m, names);
 499 }
 500
 501 static int driver_list_activatable_names(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *error) {
 502         _cleanup_strv_free_ char **names = NULL;
 503         int r;
 504
 505         r = sd_bus_list_names(bus, NULL, &names);
 506         if (r < 0)
 507                 return r;
 508
 509         /* Let's sort the names list to make it stable */
 510         strv_sort(names);
 511
 512         return return_strv(bus, m, names);
 513 }
 514
 515 static int driver_list_queued_owners(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *error) {
 516         struct kdbus_cmd_name_list cmd = {};
 517         struct kdbus_name_list *name_list;
 518         struct kdbus_cmd_name *name;
 519         _cleanup_strv_free_ char **owners = NULL;
 520         char *arg0;
 521         int r;
 522
 523         r = sd_bus_message_read(m, "s", &arg0);
 524         if (r < 0)
 525                 return r;
 526
 527         assert_return(service_name_is_valid(arg0), -EINVAL);
 528
 529         cmd.flags = KDBUS_NAME_LIST_QUEUED;
 530
 531         r = ioctl(bus->input_fd, KDBUS_CMD_NAME_LIST, &cmd);
 532         if (r < 0)
 533                 return -errno;
 534
 535         name_list = (struct kdbus_name_list *) ((uint8_t *) bus->kdbus_buffer + cmd.offset);
 536
 537         KDBUS_ITEM_FOREACH(name, name_list, names) {
 538                 char *n;
 539
 540                 if (name->size <= sizeof(*name))
 541                         continue;
 542
 543                 if (!streq(name->name, arg0))
 544                         continue;
 545
 546                 if (asprintf(&n, ":1.%llu", (unsigned long long) name->id) < 0)
 547                         return -ENOMEM;
 548
 549                 r = strv_push(&owners, n);
 550                 if (r < 0) {
 551                         free(n);
 552                         return -ENOMEM;
 553                 }
 554         }
 555
 556         r = ioctl(bus->input_fd, KDBUS_CMD_FREE, &cmd.offset);
 557         if (r < 0)
 558                 return -errno;
 559
 560         return return_strv(bus, m, owners);
 561 }
 562
 563 static int driver_name_has_owner(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *error) {
 564         char *arg0;
 565         int r;
 566
 567         r = sd_bus_message_read(m, "s", &arg0);
 568         if (r < 0)
 569                 return r;
 570
 571         assert_return(service_name_is_valid(arg0), -EINVAL);
 572
 573         r = sd_bus_get_owner(bus, arg0, 0, NULL);
 574         if (r < 0 && r != -ENOENT)
 575                 return r;
 576
 577         return sd_bus_reply_method_return(m, "b", r >= 0);
 578 }
 579
 580 static int driver_request_name(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *error) {
 581         struct kdbus_cmd_name *n;
 582         uint32_t flags;
 583         size_t size, l;
 584         uint64_t id;
 585         const char *name;
 586         int r;
 587
 588         r = sd_bus_message_read(m, "su", &name, &flags);
 589         if (r < 0)
 590                 return r;
 591
 592         assert_return(service_name_is_valid(name), -EINVAL);
 593         assert_return((flags & ~(BUS_NAME_ALLOW_REPLACEMENT|BUS_NAME_REPLACE_EXISTING|BUS_NAME_DO_NOT_QUEUE)) == 0, -EINVAL);
 594
 595         l = strlen(name);
 596         size = offsetof(struct kdbus_cmd_name, name) + l + 1;
 597         n = alloca0(size);
 598         n->size = size;
 599         memcpy(n->name, name, l+1);
 600         kdbus_translate_request_name_flags(flags, (uint64_t *) &n->flags);
 601
 602         /* This function is open-coded because we request the name 'on behalf'
 603          * of the requesting connection */
 604         r = bus_kernel_parse_unique_name(m->sender, &id);
 605         if (r < 0)
 606                 return r;
 607
 608         n->id = id;
 609
 610         r = ioctl(bus->input_fd, KDBUS_CMD_NAME_ACQUIRE, n);
 611         if (r < 0) {
 612                 if (errno == EEXIST)
 613                         return sd_bus_reply_method_return(m, "u", BUS_NAME_EXISTS);
 614                 if (errno == EALREADY)
 615                         return sd_bus_reply_method_return(m, "u", BUS_NAME_ALREADY_OWNER);
 616
 617                 return -errno;
 618         }
 619
 620         if (n->flags & KDBUS_NAME_IN_QUEUE)
 621                 return sd_bus_reply_method_return(m, "u", BUS_NAME_IN_QUEUE);
 622
 623         return sd_bus_reply_method_return(m, "u", BUS_NAME_PRIMARY_OWNER);
 624 }
 625
 626 static int driver_release_name(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *error) {
 627         struct kdbus_cmd_name *n;
 628         const char *name;
 629         size_t l, size;
 630         uint64_t id;
 631         int r;
 632
 633         r = sd_bus_message_read(m, "s", &name);
 634         if (r < 0)
 635                 return r;
 636
 637         assert_return(service_name_is_valid(name), -EINVAL);
 638
 639         l = strlen(name);
 640         size = offsetof(struct kdbus_cmd_name, name) + l + 1;
 641         n = alloca0(size);
 642         n->size = size;
 643         memcpy(n->name, name, l+1);
 644
 645         /* This function is open-coded because we request the name 'on behalf'
 646          * of the requesting connection */
 647         r = bus_kernel_parse_unique_name(m->sender, &id);
 648         if (r < 0)
 649                 return r;
 650
 651         n->id = id;
 652
 653         r = ioctl(bus->input_fd, KDBUS_CMD_NAME_RELEASE, n);
 654         if (r < 0) {
 655                 if (errno == ESRCH)
 656                         return sd_bus_reply_method_return(m, "u", BUS_NAME_NON_EXISTENT);
 657                 if (errno == EADDRINUSE)
 658                         return sd_bus_reply_method_return(m, "u", BUS_NAME_NOT_OWNER);
 659                 return -errno;
 660         }
 661
 662         return sd_bus_reply_method_return(m, "u", BUS_NAME_RELEASED);
 663 }
 664
 665 static int driver_start_service_by_name(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *error) {
 666         _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
 667         _cleanup_strv_free_ char **t = NULL;
 668         _cleanup_free_ char *path = NULL;
 669         uint32_t flags;
 670         char *name, *u;
 671         int r;
 672
 673         r = sd_bus_message_read(m, "su", &name, &flags);
 674         if (r < 0)
 675                 return r;
 676
 677         assert_return(service_name_is_valid(name), -EINVAL);
 678         assert_return(flags == 0, -ENOTSUP);
 679
 680         r = sd_bus_get_owner(bus, name, 0, NULL);
 681         if (r >= 0)
 682                 return sd_bus_reply_method_return(m, "u", BUS_START_REPLY_ALREADY_RUNNING);
 683         if (r != -ENOENT)
 684                 return r;
 685
 686         u = strappenda(name, ".busname");
 687
 688         path = unit_dbus_path_from_name(u);
 689         if (!path)
 690                 return -ENOMEM;
 691
 692         r = sd_bus_get_property_strv(
 693                         bus,
 694                         "org.freedesktop.systemd1",
 695                         path,
 696                         "org.freedesktop.systemd1.Unit",
 697                         "Triggers",
 698                         error,
 699                         &t);
 700         if (r < 0)
 701                 return r;
 702
 703         if (!t[0] || t[1])
 704                 return -EIO;
 705
 706         r = sd_bus_call_method(
 707                         bus,
 708                         "org.freedesktop.systemd1",
 709                         "/org/freedesktop/systemd1",
 710                         "org.freedesktop.systemd1.Manager",
 711                         "StartUnit",
 712                         error,
 713                         &reply,
 714                         "ss",
 715                         t[0],
 716                         "replace");
 717         if (r < 0)
 718                 return r;
 719
 720         return sd_bus_reply_method_return(m, "u", BUS_START_REPLY_SUCCESS);
 721 }
 722
 723 static int driver_unsupported(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *error) {
 724         return sd_bus_error_setf(error, SD_BUS_ERROR_NOT_SUPPORTED, "%s() is not supported", sd_bus_message_get_member(m));
 725 }
 726
 727 static const sd_bus_vtable driver_vtable[] = {
 728         SD_BUS_VTABLE_START(0),
 729         SD_BUS_METHOD("AddMatch", "s", NULL, driver_add_match, SD_BUS_VTABLE_UNPRIVILEGED),
 730         SD_BUS_METHOD("GetConnectionSELinuxSecurityContext", "s", "ay", driver_get_security_ctx, SD_BUS_VTABLE_UNPRIVILEGED),
 731         SD_BUS_METHOD("GetConnectionUnixProcessID", "s", "u", driver_get_pid, SD_BUS_VTABLE_UNPRIVILEGED),
 732         SD_BUS_METHOD("GetConnectionUnixUser", "s", "u", driver_get_user, SD_BUS_VTABLE_UNPRIVILEGED),
 733         SD_BUS_METHOD("GetId", NULL, "s", driver_get_id, SD_BUS_VTABLE_UNPRIVILEGED),
 734         SD_BUS_METHOD("GetNameOwner", "s", "s", driver_get_name_owner, SD_BUS_VTABLE_UNPRIVILEGED),
 735         SD_BUS_METHOD("Hello", NULL, "s", driver_hello, SD_BUS_VTABLE_UNPRIVILEGED),
 736         SD_BUS_METHOD("ListActivatableNames", NULL, "as", driver_list_activatable_names, SD_BUS_VTABLE_UNPRIVILEGED),
 737         SD_BUS_METHOD("ListNames", NULL, "as", driver_list_names, SD_BUS_VTABLE_UNPRIVILEGED),
 738         SD_BUS_METHOD("ListQueuedOwners", "s", "as", driver_list_queued_owners, SD_BUS_VTABLE_UNPRIVILEGED),
 739         SD_BUS_METHOD("NameHasOwner", "s", "b", driver_name_has_owner, SD_BUS_VTABLE_UNPRIVILEGED),
 740         SD_BUS_METHOD("ReleaseName", "s", "u", driver_release_name, SD_BUS_VTABLE_UNPRIVILEGED),
 741         SD_BUS_METHOD("ReloadConfig", NULL, NULL, driver_unsupported, SD_BUS_VTABLE_DEPRECATED),
 742         SD_BUS_METHOD("RemoveMatch", "s", NULL, driver_remove_match, SD_BUS_VTABLE_UNPRIVILEGED),
 743         SD_BUS_METHOD("RequestName", "su", "u", driver_request_name, SD_BUS_VTABLE_UNPRIVILEGED),
 744         SD_BUS_METHOD("StartServiceByName", "su", "u", driver_start_service_by_name, SD_BUS_VTABLE_UNPRIVILEGED),
 745         SD_BUS_METHOD("UpdateActivationEnvironment", "a{ss}", NULL, driver_unsupported, SD_BUS_VTABLE_DEPRECATED),
 746         SD_BUS_SIGNAL("NameAcquired", "s", SD_BUS_VTABLE_DEPRECATED),
 747         SD_BUS_SIGNAL("NameLost", "s", SD_BUS_VTABLE_DEPRECATED),
 748         SD_BUS_SIGNAL("NameOwnerChanged", "sss", 0),
 749         SD_BUS_VTABLE_END
 750 };
 751
 752 static int connect_bus(Context *c) {
 753         int r;
 754
 755         assert(c);
 756
 757         r = sd_bus_default_system(&c->bus);
 758         if (r < 0) {
 759                 log_error("Failed to create bus: %s", strerror(-r));
 760                 return r;
 761         }
 762
 763         if (!c->bus->is_kernel) {
 764                 log_error("Not running on kdbus");
 765                 return -EPERM;
 766         }
 767
 768         r = sd_bus_add_object_vtable(c->bus, "/org/freedesktop/DBus", "org.freedesktop.DBus", driver_vtable, c);
 769         if (r < 0) {
 770                 log_error("Failed to add manager object vtable: %s", strerror(-r));
 771                 return r;
 772         }
 773
 774         r = sd_bus_request_name(c->bus, "org.freedesktop.DBus", 0);
 775         if (r < 0) {
 776                 log_error("Unable to request name: %s\n", strerror(-r));
 777                 return r;
 778         }
 779
 780         r = sd_bus_attach_event(c->bus, c->event, 0);
 781         if (r < 0) {
 782                 log_error("Error while adding bus to event loop: %s", strerror(-r));
 783                 return r;
 784         }
 785
 786         return 0;
 787 }
 788
 789 static bool check_idle(void *userdata) {
 790         Context *c = userdata;
 791         assert(c);
 792
 793         return hashmap_isempty(c->clients);
 794 }
 795
 796 int main(int argc, char *argv[]) {
 797         Context context = {};
 798         Client *c;
 799         int r;
 800
 801         log_set_target(LOG_TARGET_AUTO);
 802         log_parse_environment();
 803         log_open();
 804
 805         if (argc != 1) {
 806                 log_error("This program takes no arguments.");
 807                 r = -EINVAL;
 808                 goto finish;
 809         }
 810
 811         r = sd_event_default(&context.event);
 812         if (r < 0) {
 813                 log_error("Failed to allocate event loop: %s", strerror(-r));
 814                 goto finish;
 815         }
 816
 817         sd_event_set_watchdog(context.event, true);
 818
 819         r = connect_bus(&context);
 820         if (r < 0)
 821                 goto finish;
 822
 823         r = bus_event_loop_with_idle(context.event, context.bus, "org.freedesktop.DBus", DEFAULT_EXIT_USEC, check_idle, &context);
 824         if (r < 0) {
 825                 log_error("Failed to run event loop: %s", strerror(-r));
 826                 goto finish;
 827         }
 828
 829 finish:
 830         while ((c = hashmap_first(context.clients)))
 831                 client_free(c);
 832
 833         sd_bus_unref(context.bus);
 834         sd_event_unref(context.event);
 835
 836         return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
 837
 838 }