src/bus-proxyd/bus-proxyd.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2010 Lennart Poettering
   7   Copyright 2013 Daniel Mack
   8   Copyright 2014 Kay Sievers
   9
  10   systemd is free software; you can redistribute it and/or modify it
  11   under the terms of the GNU Lesser General Public License as published by
  12   the Free Software Foundation; either version 2.1 of the License, or
  13   (at your option) any later version.
  14
  15   systemd is distributed in the hope that it will be useful, but
  16   WITHOUT ANY WARRANTY; without even the implied warranty of
  17   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  18   Lesser General Public License for more details.
  19
  20   You should have received a copy of the GNU Lesser General Public License
  21   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  22 ***/
  23
  24 #include <sys/socket.h>
  25 #include <sys/un.h>
  26 #include <sys/types.h>
  27 #include <fcntl.h>
  28 #include <unistd.h>
  29 #include <string.h>
  30 #include <errno.h>
  31 #include <sys/poll.h>
  32 #include <stddef.h>
  33 #include <getopt.h>
  34
  35 #include "log.h"
  36 #include "util.h"
  37 #include "socket-util.h"
  38 #include "sd-daemon.h"
  39 #include "sd-bus.h"
  40 #include "bus-internal.h"
  41 #include "bus-message.h"
  42 #include "bus-util.h"
  43 #include "build.h"
  44 #include "strv.h"
  45 #include "def.h"
  46 #include "capability.h"
  47 #include "bus-policy.h"
  48
  49 static char *arg_address = NULL;
  50 static char *arg_command_line_buffer = NULL;
  51 static bool arg_drop_privileges = false;
  52 static char **arg_configuration = NULL;
  53
  54 static int help(void) {
  55
  56         printf("%s [OPTIONS...]\n\n"
  57                "Connect STDIO or a socket to a given bus address.\n\n"
  58                "  -h --help               Show this help\n"
  59                "     --version            Show package version\n"
  60                "     --drop-privileges    Drop privileges\n"
  61                "     --configuration=PATH Configuration file or directory\n"
  62                "     --machine=MACHINE    Connect to specified machine\n"
  63                "     --address=ADDRESS    Connect to the bus specified by ADDRESS\n"
  64                "                          (default: " DEFAULT_SYSTEM_BUS_PATH ")\n",
  65                program_invocation_short_name);
  66
  67         return 0;
  68 }
  69
  70 static int parse_argv(int argc, char *argv[]) {
  71
  72         enum {
  73                 ARG_VERSION = 0x100,
  74                 ARG_ADDRESS,
  75                 ARG_DROP_PRIVILEGES,
  76                 ARG_CONFIGURATION,
  77                 ARG_MACHINE,
  78         };
  79
  80         static const struct option options[] = {
  81                 { "help",            no_argument,       NULL, 'h'                 },
  82                 { "version",         no_argument,       NULL, ARG_VERSION         },
  83                 { "address",         required_argument, NULL, ARG_ADDRESS         },
  84                 { "drop-privileges", no_argument,       NULL, ARG_DROP_PRIVILEGES },
  85                 { "configuration",   required_argument, NULL, ARG_CONFIGURATION   },
  86                 { "machine",         required_argument, NULL, ARG_MACHINE         },
  87                 {},
  88         };
  89
  90         int c, r;
  91
  92         assert(argc >= 0);
  93         assert(argv);
  94
  95         while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
  96
  97                 switch (c) {
  98
  99                 case 'h':
 100                         help();
 101                         return 0;
 102
 103                 case ARG_VERSION:
 104                         puts(PACKAGE_STRING);
 105                         puts(SYSTEMD_FEATURES);
 106                         return 0;
 107
 108                 case ARG_ADDRESS: {
 109                         char *a;
 110
 111                         a = strdup(optarg);
 112                         if (!a)
 113                                 return log_oom();
 114
 115                         free(arg_address);
 116                         arg_address = a;
 117                         break;
 118                 }
 119
 120                 case ARG_DROP_PRIVILEGES:
 121                         arg_drop_privileges = true;
 122                         break;
 123
 124                 case ARG_CONFIGURATION:
 125                         r = strv_extend(&arg_configuration, optarg);
 126                         if (r < 0)
 127                                 return log_oom();
 128                         break;
 129
 130                 case ARG_MACHINE: {
 131                         _cleanup_free_ char *e = NULL;
 132                         char *a;
 133
 134                         e = bus_address_escape(optarg);
 135                         if (!e)
 136                                 return log_oom();
 137
 138 #ifdef ENABLE_KDBUS
 139                         a = strjoin("x-container-kernel:machine=", e, ";x-container-unix:machine=", e, NULL);
 140 #else
 141                         a = strjoin("x-container-unix:machine=", e, NULL);
 142 #endif
 143                         if (!a)
 144                                 return log_oom();
 145
 146                         free(arg_address);
 147                         arg_address = a;
 148
 149                         break;
 150                 }
 151
 152                 case '?':
 153                         return -EINVAL;
 154
 155                 default:
 156                         assert_not_reached("Unhandled option");
 157                 }
 158
 159         /* If the first command line argument is only "x" characters
 160          * we'll write who we are talking to into it, so that "ps" is
 161          * explanatory */
 162         arg_command_line_buffer = argv[optind];
 163         if (argc > optind + 1 || (arg_command_line_buffer && !in_charset(arg_command_line_buffer, "x"))) {
 164                 log_error("Too many arguments");
 165                 return -EINVAL;
 166         }
 167
 168         if (!arg_address) {
 169                 arg_address = strdup(DEFAULT_SYSTEM_BUS_PATH);
 170                 if (!arg_address)
 171                         return log_oom();
 172         }
 173
 174         return 1;
 175 }
 176
 177 static int rename_service(sd_bus *a, sd_bus *b) {
 178         _cleanup_bus_creds_unref_ sd_bus_creds *creds = NULL;
 179         _cleanup_free_ char *p = NULL, *name = NULL;
 180         const char *comm;
 181         char **cmdline;
 182         uid_t uid;
 183         pid_t pid;
 184         int r;
 185
 186         assert(a);
 187         assert(b);
 188
 189         r = sd_bus_get_peer_creds(b, SD_BUS_CREDS_UID|SD_BUS_CREDS_PID|SD_BUS_CREDS_CMDLINE|SD_BUS_CREDS_COMM, &creds);
 190         if (r < 0)
 191                 return r;
 192
 193         r = sd_bus_creds_get_uid(creds, &uid);
 194         if (r < 0)
 195                 return r;
 196
 197         r = sd_bus_creds_get_pid(creds, &pid);
 198         if (r < 0)
 199                 return r;
 200
 201         r = sd_bus_creds_get_cmdline(creds, &cmdline);
 202         if (r < 0)
 203                 return r;
 204
 205         r = sd_bus_creds_get_comm(creds, &comm);
 206         if (r < 0)
 207                 return r;
 208
 209         name = uid_to_name(uid);
 210         if (!name)
 211                 return -ENOMEM;
 212
 213         p = strv_join(cmdline, " ");
 214         if (!p)
 215                 return -ENOMEM;
 216
 217         /* The status string gets the full command line ... */
 218         sd_notifyf(false,
 219                    "STATUS=Processing requests from client PID "PID_FMT" (%s); UID "UID_FMT" (%s)",
 220                    pid, p,
 221                    uid, name);
 222
 223         /* ... and the argv line only the short comm */
 224         if (arg_command_line_buffer) {
 225                 size_t m, w;
 226
 227                 m = strlen(arg_command_line_buffer);
 228                 w = snprintf(arg_command_line_buffer, m,
 229                              "[PID "PID_FMT"/%s; UID "UID_FMT"/%s]",
 230                              pid, comm,
 231                              uid, name);
 232
 233                 if (m > w)
 234                         memzero(arg_command_line_buffer + w, m - w);
 235         }
 236
 237         log_debug("Running on behalf of PID "PID_FMT" (%s), UID "UID_FMT" (%s), %s",
 238                   pid, p,
 239                   uid, name,
 240                   a->unique_name);
 241
 242         return 0;
 243 }
 244
 245 static int synthesize_name_acquired(sd_bus *a, sd_bus *b, sd_bus_message *m) {
 246         _cleanup_bus_message_unref_ sd_bus_message *n = NULL;
 247         const char *name, *old_owner, *new_owner;
 248         int r;
 249
 250         assert(a);
 251         assert(b);
 252         assert(m);
 253
 254         /* If we get NameOwnerChanged for our own name, we need to
 255          * synthesize NameLost/NameAcquired, since socket clients need
 256          * that, even though it is obsoleted on kdbus */
 257
 258         if (!a->is_kernel)
 259                 return 0;
 260
 261         if (!sd_bus_message_is_signal(m, "org.freedesktop.DBus", "NameOwnerChanged") ||
 262             !streq_ptr(m->path, "/org/freedesktop/DBus") ||
 263             !streq_ptr(m->sender, "org.freedesktop.DBus"))
 264                 return 0;
 265
 266         r = sd_bus_message_read(m, "sss", &name, &old_owner, &new_owner);
 267         if (r < 0)
 268                 return r;
 269
 270         r = sd_bus_message_rewind(m, true);
 271         if (r < 0)
 272                 return r;
 273
 274         if (streq(old_owner, a->unique_name)) {
 275
 276                 r = sd_bus_message_new_signal(
 277                                 b,
 278                                 &n,
 279                                 "/org/freedesktop/DBus",
 280                                 "org.freedesktop.DBus",
 281                                 "NameLost");
 282
 283         } else if (streq(new_owner, a->unique_name)) {
 284
 285                 r = sd_bus_message_new_signal(
 286                                 b,
 287                                 &n,
 288                                 "/org/freedesktop/DBus",
 289                                 "org.freedesktop.DBus",
 290                                 "NameAcquired");
 291         } else
 292                 return 0;
 293
 294         if (r < 0)
 295                 return r;
 296
 297         r = sd_bus_message_append(n, "s", name);
 298         if (r < 0)
 299                 return r;
 300
 301         r = bus_message_append_sender(n, "org.freedesktop.DBus");
 302         if (r < 0)
 303                 return r;
 304
 305         r = bus_seal_synthetic_message(b, n);
 306         if (r < 0)
 307                 return r;
 308
 309         return sd_bus_send(b, n, NULL);
 310 }
 311
 312 static int process_policy(sd_bus *a, sd_bus *b, sd_bus_message *m) {
 313         _cleanup_bus_message_unref_ sd_bus_message *n = NULL;
 314         int r;
 315
 316         assert(a);
 317         assert(b);
 318         assert(m);
 319
 320         if (!a->is_kernel)
 321                 return 0;
 322
 323         if (!sd_bus_message_is_method_call(m, "org.freedesktop.DBus.Properties", "GetAll"))
 324                 return 0;
 325
 326         if (!streq_ptr(m->path, "/org/gnome/DisplayManager/Slave"))
 327                 return 0;
 328
 329         r = sd_bus_message_new_method_errorf(m, &n, SD_BUS_ERROR_ACCESS_DENIED, "gdm, you are stupid");
 330         if (r < 0)
 331                 return r;
 332
 333         r = bus_message_append_sender(n, "org.freedesktop.DBus");
 334         if (r < 0) {
 335                 log_error("Failed to append sender to gdm reply: %s", strerror(-r));
 336                 return r;
 337         }
 338
 339         r = bus_seal_synthetic_message(b, n);
 340         if (r < 0) {
 341                 log_error("Failed to seal gdm reply: %s", strerror(-r));
 342                 return r;
 343         }
 344
 345         r = sd_bus_send(b, n, NULL);
 346         if (r < 0) {
 347                 log_error("Failed to send gdm reply: %s", strerror(-r));
 348                 return r;
 349         }
 350
 351         return 1;
 352 }
 353
 354 static int synthetic_driver_send(sd_bus *b, sd_bus_message *m) {
 355         int r;
 356
 357         assert(b);
 358         assert(m);
 359
 360         r = bus_message_append_sender(m, "org.freedesktop.DBus");
 361         if (r < 0)
 362                 return r;
 363
 364         r = bus_seal_synthetic_message(b, m);
 365         if (r < 0)
 366                 return r;
 367
 368         return sd_bus_send(b, m, NULL);
 369 }
 370
 371 static int synthetic_reply_method_error(sd_bus_message *call, const sd_bus_error *e) {
 372         _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
 373         int r;
 374
 375         assert(call);
 376
 377         if (call->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED)
 378                 return 0;
 379
 380         r = sd_bus_message_new_method_error(call, &m, e);
 381         if (r < 0)
 382                 return r;
 383
 384         return synthetic_driver_send(call->bus, m);
 385 }
 386
 387 static int synthetic_reply_method_errno(sd_bus_message *call, int error, const sd_bus_error *p) {
 388
 389         _cleanup_bus_error_free_ sd_bus_error berror = SD_BUS_ERROR_NULL;
 390
 391         assert(call);
 392
 393         if (call->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED)
 394                 return 0;
 395
 396         if (sd_bus_error_is_set(p))
 397                 return synthetic_reply_method_error(call, p);
 398
 399         sd_bus_error_set_errno(&berror, error);
 400
 401         return synthetic_reply_method_error(call, &berror);
 402 }
 403
 404 static int synthetic_reply_method_return(sd_bus_message *call, const char *types, ...) {
 405         _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
 406         int r;
 407
 408         assert(call);
 409
 410         if (call->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED)
 411                 return 0;
 412
 413         r = sd_bus_message_new_method_return(call, &m);
 414         if (r < 0)
 415                 return r;
 416
 417         if (!isempty(types)) {
 418                 va_list ap;
 419
 420                 va_start(ap, types);
 421                 r = bus_message_append_ap(m, types, ap);
 422                 va_end(ap);
 423                 if (r < 0)
 424                         return r;
 425         }
 426
 427         return synthetic_driver_send(call->bus, m);
 428 }
 429
 430 static int synthetic_reply_return_strv(sd_bus_message *call, char **l) {
 431         _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
 432         int r;
 433
 434         assert(call);
 435
 436         r = sd_bus_message_new_method_return(call, &m);
 437         if (r < 0)
 438                 return synthetic_reply_method_errno(call, r, NULL);
 439
 440         r = sd_bus_message_append_strv(m, l);
 441         if (r < 0)
 442                 return synthetic_reply_method_errno(call, r, NULL);
 443
 444         return synthetic_driver_send(call->bus, m);
 445 }
 446
 447 static int get_creds_by_name(sd_bus *bus, const char *name, uint64_t mask, sd_bus_creds **_creds, sd_bus_error *error) {
 448         _cleanup_bus_creds_unref_ sd_bus_creds *c = NULL;
 449         int r;
 450
 451         assert(bus);
 452         assert(name);
 453         assert(_creds);
 454
 455         assert_return(service_name_is_valid(name), -EINVAL);
 456
 457         r = sd_bus_get_owner(bus, name, mask, &c);
 458         if (r == -ESRCH || r == -ENXIO)
 459                 return sd_bus_error_setf(error, SD_BUS_ERROR_NAME_HAS_NO_OWNER, "Name %s is currently not owned by anyone.", name);
 460         if (r < 0)
 461                 return r;
 462
 463         if ((c->mask & mask) != mask)
 464                 return -ENOTSUP;
 465
 466         *_creds = c;
 467         c = NULL;
 468
 469         return 0;
 470 }
 471
 472 static int get_creds_by_message(sd_bus *bus, sd_bus_message *m, uint64_t mask, sd_bus_creds **_creds, sd_bus_error *error) {
 473         const char *name;
 474         int r;
 475
 476         assert(bus);
 477         assert(m);
 478         assert(_creds);
 479
 480         r = sd_bus_message_read(m, "s", &name);
 481         if (r < 0)
 482                 return r;
 483
 484         return get_creds_by_name(bus, name, mask, _creds, error);
 485 }
 486
 487 static int peer_is_privileged(sd_bus *bus, sd_bus_message *m) {
 488         _cleanup_bus_creds_unref_ sd_bus_creds *creds = NULL;
 489         uid_t uid;
 490         int r;
 491
 492         r = get_creds_by_message(bus, m, SD_BUS_CREDS_UID, &creds, NULL);
 493         if (r < 0)
 494                 return r;
 495
 496         r = sd_bus_creds_get_uid(creds, &uid);
 497         if (r < 0)
 498                 return r;
 499
 500         r = sd_bus_creds_has_effective_cap(creds, CAP_SYS_ADMIN);
 501         if (r > 0)
 502                 return true;
 503
 504         if (uid == getuid())
 505                 return true;
 506
 507         return false;
 508 }
 509
 510 static int process_driver(sd_bus *a, sd_bus *b, sd_bus_message *m) {
 511         int r;
 512
 513         assert(a);
 514         assert(b);
 515         assert(m);
 516
 517         if (!a->is_kernel)
 518                 return 0;
 519
 520         if (!streq_ptr(sd_bus_message_get_destination(m), "org.freedesktop.DBus"))
 521                 return 0;
 522
 523         if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus.Introspectable", "Introspect")) {
 524                 if (0 && !isempty(sd_bus_message_get_signature(m, true))) {
 525                         _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
 526
 527                         r = sd_bus_error_setf(&error, SD_BUS_ERROR_INVALID_ARGS, "Expected no parameters");
 528
 529                         return synthetic_reply_method_errno(m, r, &error);
 530                 }
 531
 532                 return synthetic_reply_method_return(m, "s",
 533                         "<!DOCTYPE node PUBLIC \"-//freedesktop//DTD D-BUS Object Introspection 1.0//EN\" "
 534                           "\"http://www.freedesktop.org/standards/dbus/1.0/introspect.dtd\">\n"
 535                         "<node>\n"
 536                         " <interface name=\"org.freedesktop.DBus.Introspectable\">\n"
 537                         "  <method name=\"Introspect\">\n"
 538                         "   <arg name=\"data\" type=\"s\" direction=\"out\"/>\n"
 539                         "  </method>\n"
 540                         " </interface>\n"
 541                         " <interface name=\"org.freedesktop.DBus\">\n"
 542                         "  <method name=\"AddMatch\">\n"
 543                         "   <arg type=\"s\" direction=\"in\"/>\n"
 544                         "  </method>\n"
 545                         "  <method name=\"RemoveMatch\">\n"
 546                         "   <arg type=\"s\" direction=\"in\"/>\n"
 547                         "  </method>\n"
 548                         "  <method name=\"GetConnectionSELinuxSecurityContext\">\n"
 549                         "   <arg type=\"s\" direction=\"in\"/>\n"
 550                         "   <arg type=\"ay\" direction=\"out\"/>\n"
 551                         "  </method>\n"
 552                         "  <method name=\"GetConnectionUnixProcessID\">\n"
 553                         "   <arg type=\"s\" direction=\"in\"/>\n"
 554                         "   <arg type=\"u\" direction=\"out\"/>\n"
 555                         "  </method>\n"
 556                         "  <method name=\"GetConnectionUnixUser\">\n"
 557                         "   <arg type=\"s\" direction=\"in\"/>\n"
 558                         "   <arg type=\"u\" direction=\"out\"/>\n"
 559                         "  </method>\n"
 560                         "  <method name=\"GetId\">\n"
 561                         "   <arg type=\"s\" direction=\"out\"/>\n"
 562                         "  </method>\n"
 563                         "  <method name=\"GetNameOwner\">\n"
 564                         "   <arg type=\"s\" direction=\"in\"/>\n"
 565                         "   <arg type=\"s\" direction=\"out\"/>\n"
 566                         "  </method>\n"
 567                         "  <method name=\"Hello\">\n"
 568                         "   <arg type=\"s\" direction=\"out\"/>\n"
 569                         "  </method>\n"
 570                         "  <method name=\"ListActivatableNames\">\n"
 571                         "   <arg type=\"as\" direction=\"out\"/>\n"
 572                         "  </method>\n"
 573                         "  <method name=\"ListNames\">\n"
 574                         "   <arg type=\"as\" direction=\"out\"/>\n"
 575                         "  </method>\n"
 576                         "  <method name=\"ListQueuedOwners\">\n"
 577                         "   <arg type=\"s\" direction=\"in\"/>\n"
 578                         "   <arg type=\"as\" direction=\"out\"/>\n"
 579                         "  </method>\n"
 580                         "  <method name=\"NameHasOwner\">\n"
 581                         "   <arg type=\"s\" direction=\"in\"/>\n"
 582                         "   <arg type=\"b\" direction=\"out\"/>\n"
 583                         "  </method>\n"
 584                         "  <method name=\"ReleaseName\">\n"
 585                         "   <arg type=\"s\" direction=\"in\"/>\n"
 586                         "   <arg type=\"u\" direction=\"out\"/>\n"
 587                         "  </method>\n"
 588                         "  <method name=\"ReloadConfig\">\n"
 589                         "  </method>\n"
 590                         "  <method name=\"RequestName\">\n"
 591                         "   <arg type=\"s\" direction=\"in\"/>\n"
 592                         "   <arg type=\"u\" direction=\"in\"/>\n"
 593                         "   <arg type=\"u\" direction=\"out\"/>\n"
 594                         "  </method>\n"
 595                         "  <method name=\"StartServiceByName\">\n"
 596                         "   <arg type=\"s\" direction=\"in\"/>\n"
 597                         "   <arg type=\"u\" direction=\"in\"/>\n"
 598                         "   <arg type=\"u\" direction=\"out\"/>\n"
 599                         "  </method>\n"
 600                         "  <method name=\"UpdateActivationEnvironment\">\n"
 601                         "   <arg type=\"a{ss}\" direction=\"in\"/>\n"
 602                         "  </method>\n"
 603                         "  <signal name=\"NameAcquired\">\n"
 604                         "   <arg type=\"s\"/>\n"
 605                         "  </signal>\n"
 606                         "  <signal name=\"NameLost\">\n"
 607                         "   <arg type=\"s\"/>\n"
 608                         "  </signal>\n"
 609                         "  <signal name=\"NameOwnerChanged\">\n"
 610                         "   <arg type=\"s\"/>\n"
 611                         "   <arg type=\"s\"/>\n"
 612                         "   <arg type=\"s\"/>\n"
 613                         "  </signal>\n"
 614                         " </interface>\n"
 615                         "</node>\n");
 616
 617         } else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "AddMatch")) {
 618                 const char *match;
 619
 620                 r = sd_bus_message_read(m, "s", &match);
 621                 if (r < 0)
 622                         return synthetic_reply_method_errno(m, r, NULL);
 623
 624                 r = sd_bus_add_match(a, NULL, match, NULL, NULL);
 625                 if (r < 0)
 626                         return synthetic_reply_method_errno(m, r, NULL);
 627
 628                 return synthetic_reply_method_return(m, NULL);
 629
 630         } else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "RemoveMatch")) {
 631                 const char *match;
 632
 633                 r = sd_bus_message_read(m, "s", &match);
 634                 if (r < 0)
 635                         return synthetic_reply_method_errno(m, r, NULL);
 636
 637                 r = bus_remove_match_by_string(a, match, NULL, NULL);
 638                 if (r == 0)
 639                         return synthetic_reply_method_error(m, &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_MATCH_RULE_NOT_FOUND, "Match rule not found"));
 640                 if (r < 0)
 641                         return synthetic_reply_method_errno(m, r, NULL);
 642
 643                 return synthetic_reply_method_return(m, NULL);
 644
 645         } else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "GetConnectionSELinuxSecurityContext")) {
 646                 _cleanup_bus_creds_unref_ sd_bus_creds *creds = NULL;
 647
 648                 r = get_creds_by_message(a, m, SD_BUS_CREDS_SELINUX_CONTEXT, &creds, NULL);
 649                 if (r < 0)
 650                         return synthetic_reply_method_errno(m, r, NULL);
 651
 652                 return synthetic_reply_method_return(m, "y", creds->label, strlen(creds->label));
 653
 654         } else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "GetConnectionUnixProcessID")) {
 655                 _cleanup_bus_creds_unref_ sd_bus_creds *creds = NULL;
 656
 657                 r = get_creds_by_message(a, m, SD_BUS_CREDS_PID, &creds, NULL);
 658                 if (r < 0)
 659                         return synthetic_reply_method_errno(m, r, NULL);
 660
 661                 return synthetic_reply_method_return(m, "u", (uint32_t) creds->pid);
 662
 663         } else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "GetConnectionUnixUser")) {
 664                 _cleanup_bus_creds_unref_ sd_bus_creds *creds = NULL;
 665
 666                 r = get_creds_by_message(a, m, SD_BUS_CREDS_UID, &creds, NULL);
 667                 if (r < 0)
 668                         return synthetic_reply_method_errno(m, r, NULL);
 669
 670                 return synthetic_reply_method_return(m, "u", (uint32_t) creds->uid);
 671
 672         } else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "GetId")) {
 673                 sd_id128_t server_id;
 674                 char buf[SD_ID128_STRING_MAX];
 675
 676                 r = sd_bus_get_server_id(a, &server_id);
 677                 if (r < 0)
 678                         return synthetic_reply_method_errno(m, r, NULL);
 679
 680                 return synthetic_reply_method_return(m, "s", sd_id128_to_string(server_id, buf));
 681
 682         } else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "GetNameOwner")) {
 683                 const char *name;
 684                 _cleanup_bus_creds_unref_ sd_bus_creds *creds = NULL;
 685                 _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
 686
 687                 r = sd_bus_message_read(m, "s", &name);
 688                 if (r < 0)
 689                         return synthetic_reply_method_errno(m, r, NULL);
 690
 691                 if (streq(name, "org.freedesktop.DBus"))
 692                         return synthetic_reply_method_return(m, "s", "org.freedesktop.DBus");
 693
 694                 r = get_creds_by_name(a, name, SD_BUS_CREDS_UNIQUE_NAME, &creds, &error);
 695                 if (r < 0)
 696                         return synthetic_reply_method_errno(m, r, &error);
 697
 698                 return synthetic_reply_method_return(m, "s", creds->unique_name);
 699
 700         /* "Hello" is handled in process_hello() */
 701
 702         } else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "ListActivatableNames")) {
 703                 _cleanup_strv_free_ char **names = NULL;
 704
 705                 r = sd_bus_list_names(a, NULL, &names);
 706                 if (r < 0)
 707                         return synthetic_reply_method_errno(m, r, NULL);
 708
 709                 /* Let's sort the names list to make it stable */
 710                 strv_sort(names);
 711
 712                 return synthetic_reply_return_strv(m, names);
 713
 714         } else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "ListNames")) {
 715                 _cleanup_strv_free_ char **names = NULL;
 716
 717                 r = sd_bus_list_names(a, &names, NULL);
 718                 if (r < 0)
 719                         return synthetic_reply_method_errno(m, r, NULL);
 720
 721                 r = strv_extend(&names, "org.freedesktop.DBus");
 722                 if (r < 0)
 723                         return synthetic_reply_method_errno(m, r, NULL);
 724
 725                 /* Let's sort the names list to make it stable */
 726                 strv_sort(names);
 727
 728                 return synthetic_reply_return_strv(m, names);
 729
 730         } else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "ListQueuedOwners")) {
 731                 struct kdbus_cmd_name_list cmd = {};
 732                 struct kdbus_name_list *name_list;
 733                 struct kdbus_cmd_free cmd_free;
 734                 struct kdbus_cmd_name *name;
 735                 _cleanup_strv_free_ char **owners = NULL;
 736                 _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
 737                 char *arg0;
 738                 int err = 0;
 739
 740                 r = sd_bus_message_read(m, "s", &arg0);
 741                 if (r < 0)
 742                         return synthetic_reply_method_errno(m, r, NULL);
 743
 744                 if (!service_name_is_valid(arg0))
 745                         return synthetic_reply_method_errno(m, -EINVAL, NULL);
 746
 747                 r = sd_bus_get_owner(a, arg0, 0, NULL);
 748                 if (r == -ESRCH || r == -ENXIO) {
 749                         sd_bus_error_setf(&error, SD_BUS_ERROR_NAME_HAS_NO_OWNER, "Could not get owners of name '%s': no such name.", arg0);
 750                         return synthetic_reply_method_errno(m, r, &error);
 751                 }
 752                 if (r < 0)
 753                         return synthetic_reply_method_errno(m, r, NULL);
 754
 755                 cmd.flags = KDBUS_NAME_LIST_QUEUED;
 756                 r = ioctl(a->input_fd, KDBUS_CMD_NAME_LIST, &cmd);
 757                 if (r < 0)
 758                         return synthetic_reply_method_errno(m, -errno, NULL);
 759
 760                 name_list = (struct kdbus_name_list *) ((uint8_t *) a->kdbus_buffer + cmd.offset);
 761
 762                 KDBUS_ITEM_FOREACH(name, name_list, names) {
 763                         const char *entry_name = NULL;
 764                         struct kdbus_item *item;
 765                         char *n;
 766
 767                         KDBUS_ITEM_FOREACH(item, name, items)
 768                                 if (item->type == KDBUS_ITEM_NAME)
 769                                         entry_name = item->str;
 770
 771                         if (!streq_ptr(entry_name, arg0))
 772                                 continue;
 773
 774                         if (asprintf(&n, ":1.%llu", (unsigned long long) name->owner_id) < 0) {
 775                                 err  = -ENOMEM;
 776                                 break;
 777                         }
 778
 779                         r = strv_consume(&owners, n);
 780                         if (r < 0) {
 781                                 err = r;
 782                                 break;
 783                         }
 784                 }
 785
 786                 cmd_free.flags = 0;
 787                 cmd_free.offset = cmd.offset;
 788
 789                 r = ioctl(a->input_fd, KDBUS_CMD_FREE, &cmd_free);
 790                 if (r < 0)
 791                         return synthetic_reply_method_errno(m, r, NULL);
 792
 793                 if (err < 0)
 794                         return synthetic_reply_method_errno(m, err, NULL);
 795
 796                 return synthetic_reply_return_strv(m, owners);
 797
 798         } else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "NameHasOwner")) {
 799                 const char *name;
 800
 801                 r = sd_bus_message_read(m, "s", &name);
 802                 if (r < 0)
 803                         return synthetic_reply_method_errno(m, r, NULL);
 804
 805                 if (!service_name_is_valid(name))
 806                         return synthetic_reply_method_errno(m, -EINVAL, NULL);
 807
 808                 if (streq(name, "org.freedesktop.DBus"))
 809                         return synthetic_reply_method_return(m, "b", true);
 810
 811                 r = sd_bus_get_owner(a, name, 0, NULL);
 812                 if (r < 0 && r != -ESRCH && r != -ENXIO)
 813                         return synthetic_reply_method_errno(m, r, NULL);
 814
 815                 return synthetic_reply_method_return(m, "b", r >= 0);
 816
 817         } else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "ReleaseName")) {
 818                 const char *name;
 819
 820                 r = sd_bus_message_read(m, "s", &name);
 821                 if (r < 0)
 822                         return synthetic_reply_method_errno(m, r, NULL);
 823
 824                 if (!service_name_is_valid(name))
 825                         return synthetic_reply_method_errno(m, -EINVAL, NULL);
 826
 827                 r = sd_bus_release_name(a, name);
 828                 if (r < 0) {
 829                         if (r == -ESRCH)
 830                                 return synthetic_reply_method_return(m, "u", BUS_NAME_NON_EXISTENT);
 831                         if (r == -EADDRINUSE)
 832                                 return synthetic_reply_method_return(m, "u", BUS_NAME_NOT_OWNER);
 833
 834                         return synthetic_reply_method_errno(m, r, NULL);
 835                 }
 836
 837                 return synthetic_reply_method_return(m, "u", BUS_NAME_RELEASED);
 838
 839         } else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "ReloadConfig")) {
 840                 _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
 841
 842                 r = sd_bus_error_setf(&error, SD_BUS_ERROR_NOT_SUPPORTED, "%s() is not supported", sd_bus_message_get_member(m));
 843
 844                 return synthetic_reply_method_errno(m, r, &error);
 845
 846         } else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "RequestName")) {
 847                 const char *name;
 848                 uint32_t flags;
 849
 850                 r = sd_bus_message_read(m, "su", &name, &flags);
 851                 if (r < 0)
 852                         return synthetic_reply_method_errno(m, r, NULL);
 853
 854                 if (!service_name_is_valid(name))
 855                         return synthetic_reply_method_errno(m, -EINVAL, NULL);
 856                 if ((flags & ~(BUS_NAME_ALLOW_REPLACEMENT|BUS_NAME_REPLACE_EXISTING|BUS_NAME_DO_NOT_QUEUE)) != 0)
 857                         return synthetic_reply_method_errno(m, -EINVAL, NULL);
 858
 859                 r = sd_bus_request_name(a, name, flags);
 860                 if (r < 0) {
 861                         if (r == -EEXIST)
 862                                 return synthetic_reply_method_return(m, "u", BUS_NAME_EXISTS);
 863                         if (r == -EALREADY)
 864                                 return synthetic_reply_method_return(m, "u", BUS_NAME_ALREADY_OWNER);
 865                         return synthetic_reply_method_errno(m, r, NULL);
 866                 }
 867
 868                 if (r == 0)
 869                         return synthetic_reply_method_return(m, "u", BUS_NAME_IN_QUEUE);
 870
 871                 return synthetic_reply_method_return(m, "u", BUS_NAME_PRIMARY_OWNER);
 872
 873         } else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "StartServiceByName")) {
 874                 _cleanup_bus_message_unref_ sd_bus_message *msg = NULL;
 875                 const char *name;
 876                 uint32_t flags;
 877
 878                 r = sd_bus_message_read(m, "su", &name, &flags);
 879                 if (r < 0)
 880                         return synthetic_reply_method_errno(m, r, NULL);
 881
 882                 if (!service_name_is_valid(name))
 883                         return synthetic_reply_method_errno(m, -EINVAL, NULL);
 884                 if (flags != 0)
 885                         return synthetic_reply_method_errno(m, -EINVAL, NULL);
 886
 887                 r = sd_bus_get_owner(a, name, 0, NULL);
 888                 if (r >= 0 || streq(name, "org.freedesktop.DBus"))
 889                         return synthetic_reply_method_return(m, "u", BUS_START_REPLY_ALREADY_RUNNING);
 890                 if (r != -ESRCH)
 891                         return synthetic_reply_method_errno(m, r, NULL);
 892
 893                 r = sd_bus_message_new_method_call(
 894                                 a,
 895                                 &msg,
 896                                 name,
 897                                 "/",
 898                                 "org.freedesktop.DBus.Peer",
 899                                 "Ping");
 900                 if (r < 0)
 901                         return synthetic_reply_method_errno(m, r, NULL);
 902
 903                 r = sd_bus_send(a, msg, NULL);
 904                 if (r < 0)
 905                         return synthetic_reply_method_errno(m, r, NULL);
 906
 907                 return synthetic_reply_method_return(m, "u", BUS_START_REPLY_SUCCESS);
 908
 909         } else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "UpdateActivationEnvironment")) {
 910                 _cleanup_bus_message_unref_ sd_bus_message *msg = NULL;
 911                 _cleanup_strv_free_ char **args = NULL;
 912
 913                 if (!peer_is_privileged(a, m))
 914                         return synthetic_reply_method_errno(m, -EPERM, NULL);
 915
 916                 r = sd_bus_message_enter_container(m, SD_BUS_TYPE_ARRAY, "{ss}");
 917                 if (r < 0)
 918                         return synthetic_reply_method_errno(m, r, NULL);
 919
 920                 while ((r = sd_bus_message_enter_container(m, SD_BUS_TYPE_DICT_ENTRY, "ss")) > 0) {
 921                         _cleanup_free_ char *s = NULL;
 922                         const char *key;
 923                         const char *value;
 924
 925                         r = sd_bus_message_read(m, "ss", &key, &value);
 926                         if (r < 0)
 927                                 return synthetic_reply_method_errno(m, r, NULL);
 928
 929                         s = strjoin(key, "=", value, NULL);
 930                         if (!s)
 931                                 return synthetic_reply_method_errno(m, -ENOMEM, NULL);
 932
 933                         r  = strv_extend(&args, s);
 934                         if (r < 0)
 935                                 return synthetic_reply_method_errno(m, r, NULL);
 936
 937                         r = sd_bus_message_exit_container(m);
 938                         if (r < 0)
 939                                 return synthetic_reply_method_errno(m, r, NULL);
 940                 }
 941
 942                 r = sd_bus_message_exit_container(m);
 943                 if (r < 0)
 944                         return synthetic_reply_method_errno(m, r, NULL);
 945
 946                 if (!args)
 947                         return synthetic_reply_method_errno(m, -EINVAL, NULL);
 948
 949                 r = sd_bus_message_new_method_call(
 950                                 a,
 951                                 &msg,
 952                                 "org.freedesktop.systemd1",
 953                                 "/org/freedesktop/systemd1",
 954                                 "org.freedesktop.systemd1.Manager",
 955                                 "SetEnvironment");
 956                 if (r < 0)
 957                         return synthetic_reply_method_errno(m, r, NULL);
 958
 959                 r = sd_bus_message_append_strv(msg, args);
 960                 if (r < 0)
 961                         return synthetic_reply_method_errno(m, r, NULL);
 962
 963                 r = sd_bus_call(a, msg, 0, NULL, NULL);
 964                 if (r < 0)
 965                         return synthetic_reply_method_errno(m, r, NULL);
 966
 967                return synthetic_reply_method_return(m, NULL);
 968
 969         } else {
 970                 _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
 971
 972                 r = sd_bus_error_setf(&error, SD_BUS_ERROR_UNKNOWN_METHOD, "Unknown method '%s'.", m->member);
 973
 974                 return synthetic_reply_method_errno(m, r, &error);
 975         }
 976 }
 977
 978 static int process_hello(sd_bus *a, sd_bus *b, sd_bus_message *m, bool *got_hello) {
 979         _cleanup_bus_message_unref_ sd_bus_message *n = NULL;
 980         bool is_hello;
 981         int r;
 982
 983         assert(a);
 984         assert(b);
 985         assert(m);
 986         assert(got_hello);
 987
 988         /* As reaction to hello we need to respond with two messages:
 989          * the callback reply and the NameAcquired for the unique
 990          * name, since hello is otherwise obsolete on kdbus. */
 991
 992         is_hello =
 993                 sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "Hello") &&
 994                 streq_ptr(m->destination, "org.freedesktop.DBus");
 995
 996         if (!is_hello) {
 997
 998                 if (*got_hello)
 999                         return 0;
1000
1001                 log_error("First packet isn't hello (it's %s.%s), aborting.", m->interface, m->member);
1002                 return -EIO;
1003         }
1004
1005         if (*got_hello) {
1006                 log_error("Got duplicate hello, aborting.");
1007                 return -EIO;
1008         }
1009
1010         *got_hello = true;
1011
1012         if (!a->is_kernel)
1013                 return 0;
1014
1015         r = sd_bus_message_new_method_return(m, &n);
1016         if (r < 0) {
1017                 log_error("Failed to generate HELLO reply: %s", strerror(-r));
1018                 return r;
1019         }
1020
1021         r = sd_bus_message_append(n, "s", a->unique_name);
1022         if (r < 0) {
1023                 log_error("Failed to append unique name to HELLO reply: %s", strerror(-r));
1024                 return r;
1025         }
1026
1027         r = bus_message_append_sender(n, "org.freedesktop.DBus");
1028         if (r < 0) {
1029                 log_error("Failed to append sender to HELLO reply: %s", strerror(-r));
1030                 return r;
1031         }
1032
1033         r = bus_seal_synthetic_message(b, n);
1034         if (r < 0) {
1035                 log_error("Failed to seal HELLO reply: %s", strerror(-r));
1036                 return r;
1037         }
1038
1039         r = sd_bus_send(b, n, NULL);
1040         if (r < 0) {
1041                 log_error("Failed to send HELLO reply: %s", strerror(-r));
1042                 return r;
1043         }
1044
1045         n = sd_bus_message_unref(n);
1046         r = sd_bus_message_new_signal(
1047                         b,
1048                         &n,
1049                         "/org/freedesktop/DBus",
1050                         "org.freedesktop.DBus",
1051                         "NameAcquired");
1052         if (r < 0) {
1053                 log_error("Failed to allocate initial NameAcquired message: %s", strerror(-r));
1054                 return r;
1055         }
1056
1057         r = sd_bus_message_append(n, "s", a->unique_name);
1058         if (r < 0) {
1059                 log_error("Failed to append unique name to NameAcquired message: %s", strerror(-r));
1060                 return r;
1061         }
1062
1063         r = bus_message_append_sender(n, "org.freedesktop.DBus");
1064         if (r < 0) {
1065                 log_error("Failed to append sender to NameAcquired message: %s", strerror(-r));
1066                 return r;
1067         }
1068
1069         r = bus_seal_synthetic_message(b, n);
1070         if (r < 0) {
1071                 log_error("Failed to seal NameAcquired message: %s", strerror(-r));
1072                 return r;
1073         }
1074
1075         r = sd_bus_send(b, n, NULL);
1076         if (r < 0) {
1077                 log_error("Failed to send NameAcquired message: %s", strerror(-r));
1078                 return r;
1079         }
1080
1081         return 1;
1082 }
1083
1084 static int patch_sender(sd_bus *a, sd_bus_message *m) {
1085         char **well_known = NULL;
1086         sd_bus_creds *c;
1087         int r;
1088
1089         assert(a);
1090         assert(m);
1091
1092         if (!a->is_kernel)
1093                 return 0;
1094
1095         /* We will change the sender of messages from the bus driver
1096          * so that they originate from the bus driver. This is a
1097          * speciality originating from dbus1, where the bus driver did
1098          * not have a unique id, but only the well-known name. */
1099
1100         c = sd_bus_message_get_creds(m);
1101         if (!c)
1102                 return 0;
1103
1104         r = sd_bus_creds_get_well_known_names(c, &well_known);
1105         if (r < 0)
1106                 return r;
1107
1108         if (strv_contains(well_known, "org.freedesktop.DBus"))
1109                 m->sender = "org.freedesktop.DBus";
1110
1111         return 0;
1112 }
1113
1114 int main(int argc, char *argv[]) {
1115
1116         _cleanup_bus_close_unref_ sd_bus *a = NULL, *b = NULL;
1117         sd_id128_t server_id;
1118         int r, in_fd, out_fd;
1119         bool got_hello = false;
1120         bool is_unix;
1121         struct ucred ucred = {};
1122         _cleanup_free_ char *peersec = NULL;
1123         Policy policy = {};
1124
1125         log_set_target(LOG_TARGET_JOURNAL_OR_KMSG);
1126         log_parse_environment();
1127         log_open();
1128
1129         r = parse_argv(argc, argv);
1130         if (r <= 0)
1131                 goto finish;
1132
1133         r = policy_load(&policy, arg_configuration);
1134         if (r < 0) {
1135                 log_error("Failed to load policy: %s", strerror(-r));
1136                 goto finish;
1137         }
1138
1139         /* policy_dump(&policy); */
1140
1141         r = sd_listen_fds(0);
1142         if (r == 0) {
1143                 in_fd = STDIN_FILENO;
1144                 out_fd = STDOUT_FILENO;
1145         } else if (r == 1) {
1146                 in_fd = SD_LISTEN_FDS_START;
1147                 out_fd = SD_LISTEN_FDS_START;
1148         } else {
1149                 log_error("Illegal number of file descriptors passed");
1150                 goto finish;
1151         }
1152
1153         is_unix =
1154                 sd_is_socket(in_fd, AF_UNIX, 0, 0) > 0 &&
1155                 sd_is_socket(out_fd, AF_UNIX, 0, 0) > 0;
1156
1157         if (is_unix) {
1158                 r = getpeercred(in_fd, &ucred);
1159                 if (r < 0) {
1160                         log_error("Failed to get peer creds: %s", strerror(-r));
1161                         goto finish;
1162                 }
1163
1164                 (void) getpeersec(in_fd, &peersec);
1165         }
1166
1167         if (arg_drop_privileges) {
1168                 const char *user = "systemd-bus-proxy";
1169                 uid_t uid;
1170                 gid_t gid;
1171
1172                 r = get_user_creds(&user, &uid, &gid, NULL, NULL);
1173                 if (r < 0) {
1174                         log_error("Cannot resolve user name %s: %s", user, strerror(-r));
1175                         goto finish;
1176                 }
1177
1178                 r = drop_privileges(uid, gid, 1ULL << CAP_IPC_OWNER);
1179                 if (r < 0)
1180                         goto finish;
1181         }
1182
1183         r = sd_bus_new(&a);
1184         if (r < 0) {
1185                 log_error("Failed to allocate bus: %s", strerror(-r));
1186                 goto finish;
1187         }
1188
1189         r = sd_bus_set_name(a, "sd-proxy");
1190         if (r < 0) {
1191                 log_error("Failed to set bus name: %s", strerror(-r));
1192                 goto finish;
1193         }
1194
1195         r = sd_bus_set_address(a, arg_address);
1196         if (r < 0) {
1197                 log_error("Failed to set address to connect to: %s", strerror(-r));
1198                 goto finish;
1199         }
1200
1201         r = sd_bus_negotiate_fds(a, is_unix);
1202         if (r < 0) {
1203                 log_error("Failed to set FD negotiation: %s", strerror(-r));
1204                 goto finish;
1205         }
1206
1207         if (ucred.pid > 0) {
1208                 a->fake_creds.pid = ucred.pid;
1209                 a->fake_creds.uid = ucred.uid;
1210                 a->fake_creds.gid = ucred.gid;
1211                 a->fake_creds_valid = true;
1212         }
1213
1214         if (peersec) {
1215                 a->fake_label = peersec;
1216                 peersec = NULL;
1217         }
1218
1219         a->manual_peer_interface = true;
1220
1221         r = sd_bus_start(a);
1222         if (r < 0) {
1223                 log_error("Failed to start bus client: %s", strerror(-r));
1224                 goto finish;
1225         }
1226
1227         r = sd_bus_get_server_id(a, &server_id);
1228         if (r < 0) {
1229                 log_error("Failed to get server ID: %s", strerror(-r));
1230                 goto finish;
1231         }
1232
1233         r = sd_bus_new(&b);
1234         if (r < 0) {
1235                 log_error("Failed to allocate bus: %s", strerror(-r));
1236                 goto finish;
1237         }
1238
1239         r = sd_bus_set_fd(b, in_fd, out_fd);
1240         if (r < 0) {
1241                 log_error("Failed to set fds: %s", strerror(-r));
1242                 goto finish;
1243         }
1244
1245         r = sd_bus_set_server(b, 1, server_id);
1246         if (r < 0) {
1247                 log_error("Failed to set server mode: %s", strerror(-r));
1248                 goto finish;
1249         }
1250
1251         r = sd_bus_negotiate_fds(b, is_unix);
1252         if (r < 0) {
1253                 log_error("Failed to set FD negotiation: %s", strerror(-r));
1254                 goto finish;
1255         }
1256
1257         r = sd_bus_set_anonymous(b, true);
1258         if (r < 0) {
1259                 log_error("Failed to set anonymous authentication: %s", strerror(-r));
1260                 goto finish;
1261         }
1262
1263         b->manual_peer_interface = true;
1264
1265         r = sd_bus_start(b);
1266         if (r < 0) {
1267                 log_error("Failed to start bus client: %s", strerror(-r));
1268                 goto finish;
1269         }
1270
1271         r = rename_service(a, b);
1272         if (r < 0)
1273                 log_debug("Failed to rename process: %s", strerror(-r));
1274
1275         if (a->is_kernel) {
1276                 _cleanup_free_ char *match = NULL;
1277                 const char *unique;
1278
1279                 r = sd_bus_get_unique_name(a, &unique);
1280                 if (r < 0) {
1281                         log_error("Failed to get unique name: %s", strerror(-r));
1282                         goto finish;
1283                 }
1284
1285                 match = strjoin("type='signal',"
1286                                 "sender='org.freedesktop.DBus',"
1287                                 "path='/org/freedesktop/DBus',"
1288                                 "interface='org.freedesktop.DBus',"
1289                                 "member='NameOwnerChanged',"
1290                                 "arg1='",
1291                                 unique,
1292                                 "'",
1293                                 NULL);
1294                 if (!match) {
1295                         log_oom();
1296                         goto finish;
1297                 }
1298
1299                 r = sd_bus_add_match(a, NULL, match, NULL, NULL);
1300                 if (r < 0) {
1301                         log_error("Failed to add match for NameLost: %s", strerror(-r));
1302                         goto finish;
1303                 }
1304
1305                 free(match);
1306                 match = strjoin("type='signal',"
1307                                 "sender='org.freedesktop.DBus',"
1308                                 "path='/org/freedesktop/DBus',"
1309                                 "interface='org.freedesktop.DBus',"
1310                                 "member='NameOwnerChanged',"
1311                                 "arg2='",
1312                                 unique,
1313                                 "'",
1314                                 NULL);
1315                 if (!match) {
1316                         log_oom();
1317                         goto finish;
1318                 }
1319
1320                 r = sd_bus_add_match(a, NULL, match, NULL, NULL);
1321                 if (r < 0) {
1322                         log_error("Failed to add match for NameAcquired: %s", strerror(-r));
1323                         goto finish;
1324                 }
1325         }
1326
1327         for (;;) {
1328                 _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
1329                 int events_a, events_b, fd;
1330                 uint64_t timeout_a, timeout_b, t;
1331                 struct timespec _ts, *ts;
1332                 struct pollfd *pollfd;
1333                 int k;
1334
1335                 if (got_hello) {
1336                         r = sd_bus_process(a, &m);
1337                         if (r < 0) {
1338                                 /* treat 'connection reset by peer' as clean exit condition */
1339                                 if (r == -ECONNRESET)
1340                                         r = 0;
1341                                 else
1342                                         log_error("Failed to process bus a: %s", strerror(-r));
1343
1344                                 goto finish;
1345                         }
1346
1347                         if (m) {
1348                                 /* We officially got EOF, let's quit */
1349                                 if (sd_bus_message_is_signal(m, "org.freedesktop.DBus.Local", "Disconnected")) {
1350                                         r = 0;
1351                                         goto finish;
1352                                 }
1353
1354                                 k = synthesize_name_acquired(a, b, m);
1355                                 if (k < 0) {
1356                                         r = k;
1357                                         log_error("Failed to synthesize message: %s", strerror(-r));
1358                                         goto finish;
1359                                 }
1360
1361                                 patch_sender(a, m);
1362
1363                                 k = sd_bus_send(b, m, NULL);
1364                                 if (k < 0) {
1365                                         if (k == -ECONNRESET)
1366                                                 r = 0;
1367                                         else {
1368                                                 r = k;
1369                                                 log_error("Failed to send message: %s", strerror(-r));
1370                                         }
1371
1372                                         goto finish;
1373                                 }
1374                         }
1375
1376                         if (r > 0)
1377                                 continue;
1378                 }
1379
1380                 r = sd_bus_process(b, &m);
1381                 if (r < 0) {
1382                         /* treat 'connection reset by peer' as clean exit condition */
1383                         if (r == -ECONNRESET)
1384                                 r = 0;
1385                         else
1386                                 log_error("Failed to process bus b: %s", strerror(-r));
1387
1388                         goto finish;
1389                 }
1390
1391                 if (m) {
1392                         /* We officially got EOF, let's quit */
1393                         if (sd_bus_message_is_signal(m, "org.freedesktop.DBus.Local", "Disconnected")) {
1394                                 r = 0;
1395                                 goto finish;
1396                         }
1397
1398                         k = process_hello(a, b, m, &got_hello);
1399                         if (k < 0) {
1400                                 r = k;
1401                                 log_error("Failed to process HELLO: %s", strerror(-r));
1402                                 goto finish;
1403                         }
1404
1405                         if (k > 0)
1406                                 r = k;
1407                         else {
1408                                 k = process_policy(a, b, m);
1409                                 if (k < 0) {
1410                                         r = k;
1411                                         log_error("Failed to process policy: %s", strerror(-r));
1412                                         goto finish;
1413                                 }
1414
1415                                 k = process_driver(a, b, m);
1416                                 if (k < 0) {
1417                                         r = k;
1418                                         log_error("Failed to process driver calls: %s", strerror(-r));
1419                                         goto finish;
1420                                 }
1421
1422                                 if (k > 0)
1423                                         r = k;
1424                                 else {
1425                                         k = sd_bus_send(a, m, NULL);
1426                                         if (k < 0) {
1427                                                 if (k == -ECONNRESET)
1428                                                         r = 0;
1429                                                 else {
1430                                                         r = k;
1431                                                         log_error("Failed to send message: %s", strerror(-r));
1432                                                 }
1433
1434                                                 goto finish;
1435                                         }
1436                                 }
1437                         }
1438                 }
1439
1440                 if (r > 0)
1441                         continue;
1442
1443                 fd = sd_bus_get_fd(a);
1444                 if (fd < 0) {
1445                         log_error("Failed to get fd: %s", strerror(-r));
1446                         goto finish;
1447                 }
1448
1449                 events_a = sd_bus_get_events(a);
1450                 if (events_a < 0) {
1451                         log_error("Failed to get events mask: %s", strerror(-r));
1452                         goto finish;
1453                 }
1454
1455                 r = sd_bus_get_timeout(a, &timeout_a);
1456                 if (r < 0) {
1457                         log_error("Failed to get timeout: %s", strerror(-r));
1458                         goto finish;
1459                 }
1460
1461                 events_b = sd_bus_get_events(b);
1462                 if (events_b < 0) {
1463                         log_error("Failed to get events mask: %s", strerror(-r));
1464                         goto finish;
1465                 }
1466
1467                 r = sd_bus_get_timeout(b, &timeout_b);
1468                 if (r < 0) {
1469                         log_error("Failed to get timeout: %s", strerror(-r));
1470                         goto finish;
1471                 }
1472
1473                 t = timeout_a;
1474                 if (t == (uint64_t) -1 || (timeout_b != (uint64_t) -1 && timeout_b < timeout_a))
1475                         t = timeout_b;
1476
1477                 if (t == (uint64_t) -1)
1478                         ts = NULL;
1479                 else {
1480                         usec_t nw;
1481
1482                         nw = now(CLOCK_MONOTONIC);
1483                         if (t > nw)
1484                                 t -= nw;
1485                         else
1486                                 t = 0;
1487
1488                         ts = timespec_store(&_ts, t);
1489                 }
1490
1491                 pollfd = (struct pollfd[3]) {
1492                         {.fd = fd,     .events = events_a,           },
1493                         {.fd = in_fd,  .events = events_b & POLLIN,  },
1494                         {.fd = out_fd, .events = events_b & POLLOUT, }
1495                 };
1496
1497                 r = ppoll(pollfd, 3, ts, NULL);
1498                 if (r < 0) {
1499                         log_error("ppoll() failed: %m");
1500                         goto finish;
1501                 }
1502         }
1503
1504 finish:
1505         sd_notify(false,
1506                   "STOPPING=1\n"
1507                   "STATUS=Shutting down.");
1508
1509         policy_free(&policy);
1510         strv_free(arg_configuration);
1511         free(arg_address);
1512
1513         return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
1514 }