src/shared/bus-util.c

   1 /***
   2   This file is part of systemd.
   3
   4   Copyright 2013 Lennart Poettering
   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 <errno.h>
  21 #include <fcntl.h>
  22 #include <inttypes.h>
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26 #include <sys/ioctl.h>
  27 #include <sys/resource.h>
  28 #include <sys/socket.h>
  29 #include <unistd.h>
  30
  31 #include "sd-bus-protocol.h"
  32 #include "sd-bus.h"
  33 #include "sd-daemon.h"
  34 #include "sd-event.h"
  35 #include "sd-id128.h"
  36
  37 #include "alloc-util.h"
  38 #include "bus-internal.h"
  39 #include "bus-label.h"
  40 #include "bus-message.h"
  41 #include "bus-util.h"
  42 #include "cap-list.h"
  43 #include "cgroup-util.h"
  44 #include "def.h"
  45 #include "escape.h"
  46 #include "fd-util.h"
  47 #include "missing.h"
  48 #include "mount-util.h"
  49 #include "nsflags.h"
  50 #include "parse-util.h"
  51 #include "proc-cmdline.h"
  52 #include "rlimit-util.h"
  53 #include "stdio-util.h"
  54 #include "strv.h"
  55 #include "user-util.h"
  56
  57 static int name_owner_change_callback(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
  58         sd_event *e = userdata;
  59
  60         assert(m);
  61         assert(e);
  62
  63         sd_bus_close(sd_bus_message_get_bus(m));
  64         sd_event_exit(e, 0);
  65
  66         return 1;
  67 }
  68
  69 int bus_async_unregister_and_exit(sd_event *e, sd_bus *bus, const char *name) {
  70         _cleanup_free_ char *match = NULL;
  71         const char *unique;
  72         int r;
  73
  74         assert(e);
  75         assert(bus);
  76         assert(name);
  77
  78         /* We unregister the name here and then wait for the
  79          * NameOwnerChanged signal for this event to arrive before we
  80          * quit. We do this in order to make sure that any queued
  81          * requests are still processed before we really exit. */
  82
  83         r = sd_bus_get_unique_name(bus, &unique);
  84         if (r < 0)
  85                 return r;
  86
  87         r = asprintf(&match,
  88                      "sender='org.freedesktop.DBus',"
  89                      "type='signal',"
  90                      "interface='org.freedesktop.DBus',"
  91                      "member='NameOwnerChanged',"
  92                      "path='/org/freedesktop/DBus',"
  93                      "arg0='%s',"
  94                      "arg1='%s',"
  95                      "arg2=''", name, unique);
  96         if (r < 0)
  97                 return -ENOMEM;
  98
  99         r = sd_bus_add_match(bus, NULL, match, name_owner_change_callback, e);
 100         if (r < 0)
 101                 return r;
 102
 103         r = sd_bus_release_name(bus, name);
 104         if (r < 0)
 105                 return r;
 106
 107         return 0;
 108 }
 109
 110 int bus_event_loop_with_idle(
 111                 sd_event *e,
 112                 sd_bus *bus,
 113                 const char *name,
 114                 usec_t timeout,
 115                 check_idle_t check_idle,
 116                 void *userdata) {
 117         bool exiting = false;
 118         int r, code;
 119
 120         assert(e);
 121         assert(bus);
 122         assert(name);
 123
 124         for (;;) {
 125                 bool idle;
 126
 127                 r = sd_event_get_state(e);
 128                 if (r < 0)
 129                         return r;
 130                 if (r == SD_EVENT_FINISHED)
 131                         break;
 132
 133                 if (check_idle)
 134                         idle = check_idle(userdata);
 135                 else
 136                         idle = true;
 137
 138                 r = sd_event_run(e, exiting || !idle ? (uint64_t) -1 : timeout);
 139                 if (r < 0)
 140                         return r;
 141
 142                 if (r == 0 && !exiting && idle) {
 143
 144                         r = sd_bus_try_close(bus);
 145                         if (r == -EBUSY)
 146                                 continue;
 147
 148                         /* Fallback for dbus1 connections: we
 149                          * unregister the name and wait for the
 150                          * response to come through for it */
 151                         if (r == -EOPNOTSUPP) {
 152
 153                                 /* Inform the service manager that we
 154                                  * are going down, so that it will
 155                                  * queue all further start requests,
 156                                  * instead of assuming we are already
 157                                  * running. */
 158                                 sd_notify(false, "STOPPING=1");
 159
 160                                 r = bus_async_unregister_and_exit(e, bus, name);
 161                                 if (r < 0)
 162                                         return r;
 163
 164                                 exiting = true;
 165                                 continue;
 166                         }
 167
 168                         if (r < 0)
 169                                 return r;
 170
 171                         sd_event_exit(e, 0);
 172                         break;
 173                 }
 174         }
 175
 176         r = sd_event_get_exit_code(e, &code);
 177         if (r < 0)
 178                 return r;
 179
 180         return code;
 181 }
 182
 183 int bus_name_has_owner(sd_bus *c, const char *name, sd_bus_error *error) {
 184         _cleanup_(sd_bus_message_unrefp) sd_bus_message *rep = NULL;
 185         int r, has_owner = 0;
 186
 187         assert(c);
 188         assert(name);
 189
 190         r = sd_bus_call_method(c,
 191                                "org.freedesktop.DBus",
 192                                "/org/freedesktop/dbus",
 193                                "org.freedesktop.DBus",
 194                                "NameHasOwner",
 195                                error,
 196                                &rep,
 197                                "s",
 198                                name);
 199         if (r < 0)
 200                 return r;
 201
 202         r = sd_bus_message_read_basic(rep, 'b', &has_owner);
 203         if (r < 0)
 204                 return sd_bus_error_set_errno(error, r);
 205
 206         return has_owner;
 207 }
 208
 209 static int check_good_user(sd_bus_message *m, uid_t good_user) {
 210         _cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL;
 211         uid_t sender_uid;
 212         int r;
 213
 214         assert(m);
 215
 216         if (good_user == UID_INVALID)
 217                 return 0;
 218
 219         r = sd_bus_query_sender_creds(m, SD_BUS_CREDS_EUID, &creds);
 220         if (r < 0)
 221                 return r;
 222
 223         /* Don't trust augmented credentials for authorization */
 224         assert_return((sd_bus_creds_get_augmented_mask(creds) & SD_BUS_CREDS_EUID) == 0, -EPERM);
 225
 226         r = sd_bus_creds_get_euid(creds, &sender_uid);
 227         if (r < 0)
 228                 return r;
 229
 230         return sender_uid == good_user;
 231 }
 232
 233 int bus_test_polkit(
 234                 sd_bus_message *call,
 235                 int capability,
 236                 const char *action,
 237                 const char **details,
 238                 uid_t good_user,
 239                 bool *_challenge,
 240                 sd_bus_error *e) {
 241
 242         int r;
 243
 244         assert(call);
 245         assert(action);
 246
 247         /* Tests non-interactively! */
 248
 249         r = check_good_user(call, good_user);
 250         if (r != 0)
 251                 return r;
 252
 253         r = sd_bus_query_sender_privilege(call, capability);
 254         if (r < 0)
 255                 return r;
 256         else if (r > 0)
 257                 return 1;
 258 #if ENABLE_POLKIT
 259         else {
 260                 _cleanup_(sd_bus_message_unrefp) sd_bus_message *request = NULL;
 261                 _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
 262                 int authorized = false, challenge = false;
 263                 const char *sender, **k, **v;
 264
 265                 sender = sd_bus_message_get_sender(call);
 266                 if (!sender)
 267                         return -EBADMSG;
 268
 269                 r = sd_bus_message_new_method_call(
 270                                 call->bus,
 271                                 &request,
 272                                 "org.freedesktop.PolicyKit1",
 273                                 "/org/freedesktop/PolicyKit1/Authority",
 274                                 "org.freedesktop.PolicyKit1.Authority",
 275                                 "CheckAuthorization");
 276                 if (r < 0)
 277                         return r;
 278
 279                 r = sd_bus_message_append(
 280                                 request,
 281                                 "(sa{sv})s",
 282                                 "system-bus-name", 1, "name", "s", sender,
 283                                 action);
 284                 if (r < 0)
 285                         return r;
 286
 287                 r = sd_bus_message_open_container(request, 'a', "{ss}");
 288                 if (r < 0)
 289                         return r;
 290
 291                 STRV_FOREACH_PAIR(k, v, details) {
 292                         r = sd_bus_message_append(request, "{ss}", *k, *v);
 293                         if (r < 0)
 294                                 return r;
 295                 }
 296
 297                 r = sd_bus_message_close_container(request);
 298                 if (r < 0)
 299                         return r;
 300
 301                 r = sd_bus_message_append(request, "us", 0, NULL);
 302                 if (r < 0)
 303                         return r;
 304
 305                 r = sd_bus_call(call->bus, request, 0, e, &reply);
 306                 if (r < 0) {
 307                         /* Treat no PK available as access denied */
 308                         if (sd_bus_error_has_name(e, SD_BUS_ERROR_SERVICE_UNKNOWN)) {
 309                                 sd_bus_error_free(e);
 310                                 return -EACCES;
 311                         }
 312
 313                         return r;
 314                 }
 315
 316                 r = sd_bus_message_enter_container(reply, 'r', "bba{ss}");
 317                 if (r < 0)
 318                         return r;
 319
 320                 r = sd_bus_message_read(reply, "bb", &authorized, &challenge);
 321                 if (r < 0)
 322                         return r;
 323
 324                 if (authorized)
 325                         return 1;
 326
 327                 if (_challenge) {
 328                         *_challenge = challenge;
 329                         return 0;
 330                 }
 331         }
 332 #endif
 333
 334         return -EACCES;
 335 }
 336
 337 #if ENABLE_POLKIT
 338
 339 typedef struct AsyncPolkitQuery {
 340         sd_bus_message *request, *reply;
 341         sd_bus_message_handler_t callback;
 342         void *userdata;
 343         sd_bus_slot *slot;
 344         Hashmap *registry;
 345 } AsyncPolkitQuery;
 346
 347 static void async_polkit_query_free(AsyncPolkitQuery *q) {
 348
 349         if (!q)
 350                 return;
 351
 352         sd_bus_slot_unref(q->slot);
 353
 354         if (q->registry && q->request)
 355                 hashmap_remove(q->registry, q->request);
 356
 357         sd_bus_message_unref(q->request);
 358         sd_bus_message_unref(q->reply);
 359
 360         free(q);
 361 }
 362
 363 static int async_polkit_callback(sd_bus_message *reply, void *userdata, sd_bus_error *error) {
 364         _cleanup_(sd_bus_error_free) sd_bus_error error_buffer = SD_BUS_ERROR_NULL;
 365         AsyncPolkitQuery *q = userdata;
 366         int r;
 367
 368         assert(reply);
 369         assert(q);
 370
 371         q->slot = sd_bus_slot_unref(q->slot);
 372         q->reply = sd_bus_message_ref(reply);
 373
 374         r = sd_bus_message_rewind(q->request, true);
 375         if (r < 0) {
 376                 r = sd_bus_reply_method_errno(q->request, r, NULL);
 377                 goto finish;
 378         }
 379
 380         r = q->callback(q->request, q->userdata, &error_buffer);
 381         r = bus_maybe_reply_error(q->request, r, &error_buffer);
 382
 383 finish:
 384         async_polkit_query_free(q);
 385
 386         return r;
 387 }
 388
 389 #endif
 390
 391 int bus_verify_polkit_async(
 392                 sd_bus_message *call,
 393                 int capability,
 394                 const char *action,
 395                 const char **details,
 396                 bool interactive,
 397                 uid_t good_user,
 398                 Hashmap **registry,
 399                 sd_bus_error *error) {
 400
 401 #if ENABLE_POLKIT
 402         _cleanup_(sd_bus_message_unrefp) sd_bus_message *pk = NULL;
 403         AsyncPolkitQuery *q;
 404         const char *sender, **k, **v;
 405         sd_bus_message_handler_t callback;
 406         void *userdata;
 407         int c;
 408 #endif
 409         int r;
 410
 411         assert(call);
 412         assert(action);
 413         assert(registry);
 414
 415         r = check_good_user(call, good_user);
 416         if (r != 0)
 417                 return r;
 418
 419 #if ENABLE_POLKIT
 420         q = hashmap_get(*registry, call);
 421         if (q) {
 422                 int authorized, challenge;
 423
 424                 /* This is the second invocation of this function, and
 425                  * there's already a response from polkit, let's
 426                  * process it */
 427                 assert(q->reply);
 428
 429                 if (sd_bus_message_is_method_error(q->reply, NULL)) {
 430                         const sd_bus_error *e;
 431
 432                         /* Copy error from polkit reply */
 433                         e = sd_bus_message_get_error(q->reply);
 434                         sd_bus_error_copy(error, e);
 435
 436                         /* Treat no PK available as access denied */
 437                         if (sd_bus_error_has_name(e, SD_BUS_ERROR_SERVICE_UNKNOWN))
 438                                 return -EACCES;
 439
 440                         return -sd_bus_error_get_errno(e);
 441                 }
 442
 443                 r = sd_bus_message_enter_container(q->reply, 'r', "bba{ss}");
 444                 if (r >= 0)
 445                         r = sd_bus_message_read(q->reply, "bb", &authorized, &challenge);
 446
 447                 if (r < 0)
 448                         return r;
 449
 450                 if (authorized)
 451                         return 1;
 452
 453                 if (challenge)
 454                         return sd_bus_error_set(error, SD_BUS_ERROR_INTERACTIVE_AUTHORIZATION_REQUIRED, "Interactive authentication required.");
 455
 456                 return -EACCES;
 457         }
 458 #endif
 459
 460         r = sd_bus_query_sender_privilege(call, capability);
 461         if (r < 0)
 462                 return r;
 463         else if (r > 0)
 464                 return 1;
 465
 466 #if ENABLE_POLKIT
 467         if (sd_bus_get_current_message(call->bus) != call)
 468                 return -EINVAL;
 469
 470         callback = sd_bus_get_current_handler(call->bus);
 471         if (!callback)
 472                 return -EINVAL;
 473
 474         userdata = sd_bus_get_current_userdata(call->bus);
 475
 476         sender = sd_bus_message_get_sender(call);
 477         if (!sender)
 478                 return -EBADMSG;
 479
 480         c = sd_bus_message_get_allow_interactive_authorization(call);
 481         if (c < 0)
 482                 return c;
 483         if (c > 0)
 484                 interactive = true;
 485
 486         r = hashmap_ensure_allocated(registry, NULL);
 487         if (r < 0)
 488                 return r;
 489
 490         r = sd_bus_message_new_method_call(
 491                         call->bus,
 492                         &pk,
 493                         "org.freedesktop.PolicyKit1",
 494                         "/org/freedesktop/PolicyKit1/Authority",
 495                         "org.freedesktop.PolicyKit1.Authority",
 496                         "CheckAuthorization");
 497         if (r < 0)
 498                 return r;
 499
 500         r = sd_bus_message_append(
 501                         pk,
 502                         "(sa{sv})s",
 503                         "system-bus-name", 1, "name", "s", sender,
 504                         action);
 505         if (r < 0)
 506                 return r;
 507
 508         r = sd_bus_message_open_container(pk, 'a', "{ss}");
 509         if (r < 0)
 510                 return r;
 511
 512         STRV_FOREACH_PAIR(k, v, details) {
 513                 r = sd_bus_message_append(pk, "{ss}", *k, *v);
 514                 if (r < 0)
 515                         return r;
 516         }
 517
 518         r = sd_bus_message_close_container(pk);
 519         if (r < 0)
 520                 return r;
 521
 522         r = sd_bus_message_append(pk, "us", !!interactive, NULL);
 523         if (r < 0)
 524                 return r;
 525
 526         q = new0(AsyncPolkitQuery, 1);
 527         if (!q)
 528                 return -ENOMEM;
 529
 530         q->request = sd_bus_message_ref(call);
 531         q->callback = callback;
 532         q->userdata = userdata;
 533
 534         r = hashmap_put(*registry, call, q);
 535         if (r < 0) {
 536                 async_polkit_query_free(q);
 537                 return r;
 538         }
 539
 540         q->registry = *registry;
 541
 542         r = sd_bus_call_async(call->bus, &q->slot, pk, async_polkit_callback, q, 0);
 543         if (r < 0) {
 544                 async_polkit_query_free(q);
 545                 return r;
 546         }
 547
 548         return 0;
 549 #endif
 550
 551         return -EACCES;
 552 }
 553
 554 void bus_verify_polkit_async_registry_free(Hashmap *registry) {
 555 #if ENABLE_POLKIT
 556         AsyncPolkitQuery *q;
 557
 558         while ((q = hashmap_steal_first(registry)))
 559                 async_polkit_query_free(q);
 560
 561         hashmap_free(registry);
 562 #endif
 563 }
 564
 565 int bus_check_peercred(sd_bus *c) {
 566         struct ucred ucred;
 567         socklen_t l;
 568         int fd;
 569
 570         assert(c);
 571
 572         fd = sd_bus_get_fd(c);
 573         if (fd < 0)
 574                 return fd;
 575
 576         l = sizeof(struct ucred);
 577         if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &ucred, &l) < 0)
 578                 return -errno;
 579
 580         if (l != sizeof(struct ucred))
 581                 return -E2BIG;
 582
 583         if (ucred.uid != 0 && ucred.uid != geteuid())
 584                 return -EPERM;
 585
 586         return 1;
 587 }
 588
 589 int bus_connect_system_systemd(sd_bus **_bus) {
 590         _cleanup_(sd_bus_unrefp) sd_bus *bus = NULL;
 591         int r;
 592
 593         assert(_bus);
 594
 595         if (geteuid() != 0)
 596                 return sd_bus_default_system(_bus);
 597
 598         /* If we are root then let's talk directly to the system
 599          * instance, instead of going via the bus */
 600
 601         r = sd_bus_new(&bus);
 602         if (r < 0)
 603                 return r;
 604
 605         r = sd_bus_set_address(bus, "unix:path=/run/systemd/private");
 606         if (r < 0)
 607                 return r;
 608
 609         r = sd_bus_start(bus);
 610         if (r < 0)
 611                 return sd_bus_default_system(_bus);
 612
 613         r = bus_check_peercred(bus);
 614         if (r < 0)
 615                 return r;
 616
 617         *_bus = bus;
 618         bus = NULL;
 619
 620         return 0;
 621 }
 622
 623 int bus_connect_user_systemd(sd_bus **_bus) {
 624         _cleanup_(sd_bus_unrefp) sd_bus *bus = NULL;
 625         _cleanup_free_ char *ee = NULL;
 626         const char *e;
 627         int r;
 628
 629         assert(_bus);
 630
 631         e = secure_getenv("XDG_RUNTIME_DIR");
 632         if (!e)
 633                 return sd_bus_default_user(_bus);
 634
 635         ee = bus_address_escape(e);
 636         if (!ee)
 637                 return -ENOMEM;
 638
 639         r = sd_bus_new(&bus);
 640         if (r < 0)
 641                 return r;
 642
 643         bus->address = strjoin("unix:path=", ee, "/systemd/private");
 644         if (!bus->address)
 645                 return -ENOMEM;
 646
 647         r = sd_bus_start(bus);
 648         if (r < 0)
 649                 return sd_bus_default_user(_bus);
 650
 651         r = bus_check_peercred(bus);
 652         if (r < 0)
 653                 return r;
 654
 655         *_bus = bus;
 656         bus = NULL;
 657
 658         return 0;
 659 }
 660
 661 #define print_property(name, fmt, ...)                                  \
 662         do {                                                            \
 663                 if (value)                                              \
 664                         printf(fmt "\n", __VA_ARGS__);                  \
 665                 else                                                    \
 666                         printf("%s=" fmt "\n", name, __VA_ARGS__);      \
 667         } while(0)
 668
 669 int bus_print_property(const char *name, sd_bus_message *property, bool value, bool all) {
 670         char type;
 671         const char *contents;
 672         int r;
 673
 674         assert(name);
 675         assert(property);
 676
 677         r = sd_bus_message_peek_type(property, &type, &contents);
 678         if (r < 0)
 679                 return r;
 680
 681         switch (type) {
 682
 683         case SD_BUS_TYPE_STRING: {
 684                 const char *s;
 685
 686                 r = sd_bus_message_read_basic(property, type, &s);
 687                 if (r < 0)
 688                         return r;
 689
 690                 if (all || !isempty(s)) {
 691                         bool good;
 692
 693                         /* This property has a single value, so we need to take
 694                          * care not to print a new line, everything else is OK. */
 695                         good = !strchr(s, '\n');
 696                         print_property(name, "%s", good ? s : "[unprintable]");
 697                 }
 698
 699                 return 1;
 700         }
 701
 702         case SD_BUS_TYPE_BOOLEAN: {
 703                 int b;
 704
 705                 r = sd_bus_message_read_basic(property, type, &b);
 706                 if (r < 0)
 707                         return r;
 708
 709                 print_property(name, "%s", yes_no(b));
 710
 711                 return 1;
 712         }
 713
 714         case SD_BUS_TYPE_UINT64: {
 715                 uint64_t u;
 716
 717                 r = sd_bus_message_read_basic(property, type, &u);
 718                 if (r < 0)
 719                         return r;
 720
 721                 /* Yes, heuristics! But we can change this check
 722                  * should it turn out to not be sufficient */
 723
 724                 if (endswith(name, "Timestamp")) {
 725                         char timestamp[FORMAT_TIMESTAMP_MAX], *t;
 726
 727                         t = format_timestamp(timestamp, sizeof(timestamp), u);
 728                         if (t || all)
 729                                 print_property(name, "%s", strempty(t));
 730
 731                 } else if (strstr(name, "USec")) {
 732                         char timespan[FORMAT_TIMESPAN_MAX];
 733
 734                         print_property(name, "%s", format_timespan(timespan, sizeof(timespan), u, 0));
 735                 } else if (streq(name, "RestrictNamespaces")) {
 736                         _cleanup_free_ char *s = NULL;
 737                         const char *result;
 738
 739                         if ((u & NAMESPACE_FLAGS_ALL) == 0)
 740                                 result = "yes";
 741                         else if ((u & NAMESPACE_FLAGS_ALL) == NAMESPACE_FLAGS_ALL)
 742                                 result = "no";
 743                         else {
 744                                 r = namespace_flag_to_string_many(u, &s);
 745                                 if (r < 0)
 746                                         return r;
 747
 748                                 result = s;
 749                         }
 750
 751                         print_property(name, "%s", result);
 752
 753                 } else if (streq(name, "MountFlags")) {
 754                         const char *result;
 755
 756                         result = mount_propagation_flags_to_string(u);
 757                         if (!result)
 758                                 return -EINVAL;
 759
 760                         print_property(name, "%s", result);
 761
 762                 } else if (STR_IN_SET(name, "CapabilityBoundingSet", "AmbientCapabilities")) {
 763                         _cleanup_free_ char *s = NULL;
 764
 765                         r = capability_set_to_string_alloc(u, &s);
 766                         if (r < 0)
 767                                 return r;
 768
 769                         print_property(name, "%s", s);
 770
 771                 } else if ((STR_IN_SET(name, "CPUWeight", "StartupCPUWeight", "IOWeight", "StartupIOWeight") && u == CGROUP_WEIGHT_INVALID) ||
 772                            (STR_IN_SET(name, "CPUShares", "StartupCPUShares") && u == CGROUP_CPU_SHARES_INVALID) ||
 773                            (STR_IN_SET(name, "BlockIOWeight", "StartupBlockIOWeight") && u == CGROUP_BLKIO_WEIGHT_INVALID) ||
 774                            (STR_IN_SET(name, "MemoryCurrent", "TasksCurrent") && u == (uint64_t) -1) ||
 775                            (endswith(name, "NSec") && u == (uint64_t) -1))
 776
 777                         print_property(name, "%s", "[not set]");
 778
 779                 else if ((STR_IN_SET(name, "MemoryLow", "MemoryHigh", "MemoryMax", "MemorySwapMax", "MemoryLimit") && u == CGROUP_LIMIT_MAX) ||
 780                          (STR_IN_SET(name, "TasksMax", "DefaultTasksMax") && u == (uint64_t) -1) ||
 781                          (startswith(name, "Limit") && u == (uint64_t) -1) ||
 782                          (startswith(name, "DefaultLimit") && u == (uint64_t) -1))
 783
 784                         print_property(name, "%s", "infinity");
 785                 else
 786                         print_property(name, "%"PRIu64, u);
 787
 788                 return 1;
 789         }
 790
 791         case SD_BUS_TYPE_INT64: {
 792                 int64_t i;
 793
 794                 r = sd_bus_message_read_basic(property, type, &i);
 795                 if (r < 0)
 796                         return r;
 797
 798                 print_property(name, "%"PRIi64, i);
 799
 800                 return 1;
 801         }
 802
 803         case SD_BUS_TYPE_UINT32: {
 804                 uint32_t u;
 805
 806                 r = sd_bus_message_read_basic(property, type, &u);
 807                 if (r < 0)
 808                         return r;
 809
 810                 if (strstr(name, "UMask") || strstr(name, "Mode"))
 811                         print_property(name, "%04o", u);
 812                 else if (streq(name, "UID")) {
 813                         if (u == UID_INVALID)
 814                                 print_property(name, "%s", "[not set]");
 815                         else
 816                                 print_property(name, "%"PRIu32, u);
 817                 } else if (streq(name, "GID")) {
 818                         if (u == GID_INVALID)
 819                                 print_property(name, "%s", "[not set]");
 820                         else
 821                                 print_property(name, "%"PRIu32, u);
 822                 } else
 823                         print_property(name, "%"PRIu32, u);
 824
 825                 return 1;
 826         }
 827
 828         case SD_BUS_TYPE_INT32: {
 829                 int32_t i;
 830
 831                 r = sd_bus_message_read_basic(property, type, &i);
 832                 if (r < 0)
 833                         return r;
 834
 835                 print_property(name, "%"PRIi32, i);
 836                 return 1;
 837         }
 838
 839         case SD_BUS_TYPE_DOUBLE: {
 840                 double d;
 841
 842                 r = sd_bus_message_read_basic(property, type, &d);
 843                 if (r < 0)
 844                         return r;
 845
 846                 print_property(name, "%g", d);
 847                 return 1;
 848         }
 849
 850         case SD_BUS_TYPE_ARRAY:
 851                 if (streq(contents, "s")) {
 852                         bool first = true;
 853                         const char *str;
 854
 855                         r = sd_bus_message_enter_container(property, SD_BUS_TYPE_ARRAY, contents);
 856                         if (r < 0)
 857                                 return r;
 858
 859                         while ((r = sd_bus_message_read_basic(property, SD_BUS_TYPE_STRING, &str)) > 0) {
 860                                 bool good;
 861
 862                                 if (first && !value)
 863                                         printf("%s=", name);
 864
 865                                 /* This property has multiple space-separated values, so
 866                                  * neither spaces not newlines can be allowed in a value. */
 867                                 good = str[strcspn(str, " \n")] == '\0';
 868
 869                                 printf("%s%s", first ? "" : " ", good ? str : "[unprintable]");
 870
 871                                 first = false;
 872                         }
 873                         if (r < 0)
 874                                 return r;
 875
 876                         if (first && all && !value)
 877                                 printf("%s=", name);
 878                         if (!first || all)
 879                                 puts("");
 880
 881                         r = sd_bus_message_exit_container(property);
 882                         if (r < 0)
 883                                 return r;
 884
 885                         return 1;
 886
 887                 } else if (streq(contents, "y")) {
 888                         const uint8_t *u;
 889                         size_t n;
 890
 891                         r = sd_bus_message_read_array(property, SD_BUS_TYPE_BYTE, (const void**) &u, &n);
 892                         if (r < 0)
 893                                 return r;
 894
 895                         if (all || n > 0) {
 896                                 unsigned int i;
 897
 898                                 if (!value)
 899                                         printf("%s=", name);
 900
 901                                 for (i = 0; i < n; i++)
 902                                         printf("%02x", u[i]);
 903
 904                                 puts("");
 905                         }
 906
 907                         return 1;
 908
 909                 } else if (streq(contents, "u")) {
 910                         uint32_t *u;
 911                         size_t n;
 912
 913                         r = sd_bus_message_read_array(property, SD_BUS_TYPE_UINT32, (const void**) &u, &n);
 914                         if (r < 0)
 915                                 return r;
 916
 917                         if (all || n > 0) {
 918                                 unsigned int i;
 919
 920                                 if (!value)
 921                                         printf("%s=", name);
 922
 923                                 for (i = 0; i < n; i++)
 924                                         printf("%08x", u[i]);
 925
 926                                 puts("");
 927                         }
 928
 929                         return 1;
 930                 }
 931
 932                 break;
 933         }
 934
 935         return 0;
 936 }
 937
 938 int bus_print_all_properties(sd_bus *bus, const char *dest, const char *path, char **filter, bool value, bool all) {
 939         _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
 940         _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
 941         int r;
 942
 943         assert(bus);
 944         assert(path);
 945
 946         r = sd_bus_call_method(bus,
 947                         dest,
 948                         path,
 949                         "org.freedesktop.DBus.Properties",
 950                         "GetAll",
 951                         &error,
 952                         &reply,
 953                         "s", "");
 954         if (r < 0)
 955                 return r;
 956
 957         r = sd_bus_message_enter_container(reply, SD_BUS_TYPE_ARRAY, "{sv}");
 958         if (r < 0)
 959                 return r;
 960
 961         while ((r = sd_bus_message_enter_container(reply, SD_BUS_TYPE_DICT_ENTRY, "sv")) > 0) {
 962                 const char *name;
 963                 const char *contents;
 964
 965                 r = sd_bus_message_read_basic(reply, SD_BUS_TYPE_STRING, &name);
 966                 if (r < 0)
 967                         return r;
 968
 969                 if (!filter || strv_find(filter, name)) {
 970                         r = sd_bus_message_peek_type(reply, NULL, &contents);
 971                         if (r < 0)
 972                                 return r;
 973
 974                         r = sd_bus_message_enter_container(reply, SD_BUS_TYPE_VARIANT, contents);
 975                         if (r < 0)
 976                                 return r;
 977
 978                         r = bus_print_property(name, reply, value, all);
 979                         if (r < 0)
 980                                 return r;
 981                         if (r == 0) {
 982                                 if (all)
 983                                         printf("%s=[unprintable]\n", name);
 984                                 /* skip what we didn't read */
 985                                 r = sd_bus_message_skip(reply, contents);
 986                                 if (r < 0)
 987                                         return r;
 988                         }
 989
 990                         r = sd_bus_message_exit_container(reply);
 991                         if (r < 0)
 992                                 return r;
 993                 } else {
 994                         r = sd_bus_message_skip(reply, "v");
 995                         if (r < 0)
 996                                 return r;
 997                 }
 998
 999                 r = sd_bus_message_exit_container(reply);
1000                 if (r < 0)
1001                         return r;
1002         }
1003         if (r < 0)
1004                 return r;
1005
1006         r = sd_bus_message_exit_container(reply);
1007         if (r < 0)
1008                 return r;
1009
1010         return 0;
1011 }
1012
1013 int bus_map_id128(sd_bus *bus, const char *member, sd_bus_message *m, sd_bus_error *error, void *userdata) {
1014         sd_id128_t *p = userdata;
1015         const void *v;
1016         size_t n;
1017         int r;
1018
1019         r = sd_bus_message_read_array(m, SD_BUS_TYPE_BYTE, &v, &n);
1020         if (r < 0)
1021                 return r;
1022
1023         if (n == 0)
1024                 *p = SD_ID128_NULL;
1025         else if (n == 16)
1026                 memcpy((*p).bytes, v, n);
1027         else
1028                 return -EINVAL;
1029
1030         return 0;
1031 }
1032
1033 static int map_basic(sd_bus *bus, const char *member, sd_bus_message *m, sd_bus_error *error, void *userdata) {
1034         char type;
1035         int r;
1036
1037         r = sd_bus_message_peek_type(m, &type, NULL);
1038         if (r < 0)
1039                 return r;
1040
1041         switch (type) {
1042
1043         case SD_BUS_TYPE_STRING: {
1044                 char **p = userdata;
1045                 const char *s;
1046
1047                 r = sd_bus_message_read_basic(m, type, &s);
1048                 if (r < 0)
1049                         return r;
1050
1051                 if (isempty(s))
1052                         s = NULL;
1053
1054                 return free_and_strdup(p, s);
1055         }
1056
1057         case SD_BUS_TYPE_ARRAY: {
1058                 _cleanup_strv_free_ char **l = NULL;
1059                 char ***p = userdata;
1060
1061                 r = bus_message_read_strv_extend(m, &l);
1062                 if (r < 0)
1063                         return r;
1064
1065                 strv_free(*p);
1066                 *p = l;
1067                 l = NULL;
1068                 return 0;
1069         }
1070
1071         case SD_BUS_TYPE_BOOLEAN: {
1072                 unsigned b;
1073                 int *p = userdata;
1074
1075                 r = sd_bus_message_read_basic(m, type, &b);
1076                 if (r < 0)
1077                         return r;
1078
1079                 *p = b;
1080                 return 0;
1081         }
1082
1083         case SD_BUS_TYPE_INT32:
1084         case SD_BUS_TYPE_UINT32: {
1085                 uint32_t u, *p = userdata;
1086
1087                 r = sd_bus_message_read_basic(m, type, &u);
1088                 if (r < 0)
1089                         return r;
1090
1091                 *p = u;
1092                 return 0;
1093         }
1094
1095         case SD_BUS_TYPE_INT64:
1096         case SD_BUS_TYPE_UINT64: {
1097                 uint64_t t, *p = userdata;
1098
1099                 r = sd_bus_message_read_basic(m, type, &t);
1100                 if (r < 0)
1101                         return r;
1102
1103                 *p = t;
1104                 return 0;
1105         }
1106
1107         case SD_BUS_TYPE_DOUBLE: {
1108                 double d, *p = userdata;
1109
1110                 r = sd_bus_message_read_basic(m, type, &d);
1111                 if (r < 0)
1112                         return r;
1113
1114                 *p = d;
1115                 return 0;
1116         }}
1117
1118         return -EOPNOTSUPP;
1119 }
1120
1121 int bus_message_map_all_properties(
1122                 sd_bus_message *m,
1123                 const struct bus_properties_map *map,
1124                 sd_bus_error *error,
1125                 void *userdata) {
1126
1127         int r;
1128
1129         assert(m);
1130         assert(map);
1131
1132         r = sd_bus_message_enter_container(m, SD_BUS_TYPE_ARRAY, "{sv}");
1133         if (r < 0)
1134                 return r;
1135
1136         while ((r = sd_bus_message_enter_container(m, SD_BUS_TYPE_DICT_ENTRY, "sv")) > 0) {
1137                 const struct bus_properties_map *prop;
1138                 const char *member;
1139                 const char *contents;
1140                 void *v;
1141                 unsigned i;
1142
1143                 r = sd_bus_message_read_basic(m, SD_BUS_TYPE_STRING, &member);
1144                 if (r < 0)
1145                         return r;
1146
1147                 for (i = 0, prop = NULL; map[i].member; i++)
1148                         if (streq(map[i].member, member)) {
1149                                 prop = &map[i];
1150                                 break;
1151                         }
1152
1153                 if (prop) {
1154                         r = sd_bus_message_peek_type(m, NULL, &contents);
1155                         if (r < 0)
1156                                 return r;
1157
1158                         r = sd_bus_message_enter_container(m, SD_BUS_TYPE_VARIANT, contents);
1159                         if (r < 0)
1160                                 return r;
1161
1162                         v = (uint8_t *)userdata + prop->offset;
1163                         if (map[i].set)
1164                                 r = prop->set(sd_bus_message_get_bus(m), member, m, error, v);
1165                         else
1166                                 r = map_basic(sd_bus_message_get_bus(m), member, m, error, v);
1167                         if (r < 0)
1168                                 return r;
1169
1170                         r = sd_bus_message_exit_container(m);
1171                         if (r < 0)
1172                                 return r;
1173                 } else {
1174                         r = sd_bus_message_skip(m, "v");
1175                         if (r < 0)
1176                                 return r;
1177                 }
1178
1179                 r = sd_bus_message_exit_container(m);
1180                 if (r < 0)
1181                         return r;
1182         }
1183         if (r < 0)
1184                 return r;
1185
1186         return sd_bus_message_exit_container(m);
1187 }
1188
1189 int bus_message_map_properties_changed(
1190                 sd_bus_message *m,
1191                 const struct bus_properties_map *map,
1192                 sd_bus_error *error,
1193                 void *userdata) {
1194
1195         const char *member;
1196         int r, invalidated, i;
1197
1198         assert(m);
1199         assert(map);
1200
1201         r = bus_message_map_all_properties(m, map, error, userdata);
1202         if (r < 0)
1203                 return r;
1204
1205         r = sd_bus_message_enter_container(m, SD_BUS_TYPE_ARRAY, "s");
1206         if (r < 0)
1207                 return r;
1208
1209         invalidated = 0;
1210         while ((r = sd_bus_message_read_basic(m, SD_BUS_TYPE_STRING, &member)) > 0)
1211                 for (i = 0; map[i].member; i++)
1212                         if (streq(map[i].member, member)) {
1213                                 ++invalidated;
1214                                 break;
1215                         }
1216         if (r < 0)
1217                 return r;
1218
1219         r = sd_bus_message_exit_container(m);
1220         if (r < 0)
1221                 return r;
1222
1223         return invalidated;
1224 }
1225
1226 int bus_map_all_properties(
1227                 sd_bus *bus,
1228                 const char *destination,
1229                 const char *path,
1230                 const struct bus_properties_map *map,
1231                 sd_bus_error *error,
1232                 void *userdata) {
1233
1234         _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
1235         int r;
1236
1237         assert(bus);
1238         assert(destination);
1239         assert(path);
1240         assert(map);
1241
1242         r = sd_bus_call_method(
1243                         bus,
1244                         destination,
1245                         path,
1246                         "org.freedesktop.DBus.Properties",
1247                         "GetAll",
1248                         error,
1249                         &m,
1250                         "s", "");
1251         if (r < 0)
1252                 return r;
1253
1254         return bus_message_map_all_properties(m, map, error, userdata);
1255 }
1256
1257 int bus_connect_transport(BusTransport transport, const char *host, bool user, sd_bus **ret) {
1258         _cleanup_(sd_bus_unrefp) sd_bus *bus = NULL;
1259         int r;
1260
1261         assert(transport >= 0);
1262         assert(transport < _BUS_TRANSPORT_MAX);
1263         assert(ret);
1264
1265         assert_return((transport == BUS_TRANSPORT_LOCAL) == !host, -EINVAL);
1266         assert_return(transport == BUS_TRANSPORT_LOCAL || !user, -EOPNOTSUPP);
1267
1268         switch (transport) {
1269
1270         case BUS_TRANSPORT_LOCAL:
1271                 if (user)
1272                         r = sd_bus_default_user(&bus);
1273                 else
1274                         r = sd_bus_default_system(&bus);
1275
1276                 break;
1277
1278         case BUS_TRANSPORT_REMOTE:
1279                 r = sd_bus_open_system_remote(&bus, host);
1280                 break;
1281
1282         case BUS_TRANSPORT_MACHINE:
1283                 r = sd_bus_open_system_machine(&bus, host);
1284                 break;
1285
1286         default:
1287                 assert_not_reached("Hmm, unknown transport type.");
1288         }
1289         if (r < 0)
1290                 return r;
1291
1292         r = sd_bus_set_exit_on_disconnect(bus, true);
1293         if (r < 0)
1294                 return r;
1295
1296         *ret = bus;
1297         bus = NULL;
1298
1299         return 0;
1300 }
1301
1302 int bus_connect_transport_systemd(BusTransport transport, const char *host, bool user, sd_bus **bus) {
1303         int r;
1304
1305         assert(transport >= 0);
1306         assert(transport < _BUS_TRANSPORT_MAX);
1307         assert(bus);
1308
1309         assert_return((transport == BUS_TRANSPORT_LOCAL) == !host, -EINVAL);
1310         assert_return(transport == BUS_TRANSPORT_LOCAL || !user, -EOPNOTSUPP);
1311
1312         switch (transport) {
1313
1314         case BUS_TRANSPORT_LOCAL:
1315                 if (user)
1316                         r = bus_connect_user_systemd(bus);
1317                 else
1318                         r = bus_connect_system_systemd(bus);
1319
1320                 break;
1321
1322         case BUS_TRANSPORT_REMOTE:
1323                 r = sd_bus_open_system_remote(bus, host);
1324                 break;
1325
1326         case BUS_TRANSPORT_MACHINE:
1327                 r = sd_bus_open_system_machine(bus, host);
1328                 break;
1329
1330         default:
1331                 assert_not_reached("Hmm, unknown transport type.");
1332         }
1333
1334         return r;
1335 }
1336
1337 int bus_property_get_bool(
1338                 sd_bus *bus,
1339                 const char *path,
1340                 const char *interface,
1341                 const char *property,
1342                 sd_bus_message *reply,
1343                 void *userdata,
1344                 sd_bus_error *error) {
1345
1346         int b = *(bool*) userdata;
1347
1348         return sd_bus_message_append_basic(reply, 'b', &b);
1349 }
1350
1351 int bus_property_get_id128(
1352                 sd_bus *bus,
1353                 const char *path,
1354                 const char *interface,
1355                 const char *property,
1356                 sd_bus_message *reply,
1357                 void *userdata,
1358                 sd_bus_error *error) {
1359
1360         sd_id128_t *id = userdata;
1361
1362         if (sd_id128_is_null(*id)) /* Add an empty array if the ID is zero */
1363                 return sd_bus_message_append(reply, "ay", 0);
1364         else
1365                 return sd_bus_message_append_array(reply, 'y', id->bytes, 16);
1366 }
1367
1368 #if __SIZEOF_SIZE_T__ != 8
1369 int bus_property_get_size(
1370                 sd_bus *bus,
1371                 const char *path,
1372                 const char *interface,
1373                 const char *property,
1374                 sd_bus_message *reply,
1375                 void *userdata,
1376                 sd_bus_error *error) {
1377
1378         uint64_t sz = *(size_t*) userdata;
1379
1380         return sd_bus_message_append_basic(reply, 't', &sz);
1381 }
1382 #endif
1383
1384 #if __SIZEOF_LONG__ != 8
1385 int bus_property_get_long(
1386                 sd_bus *bus,
1387                 const char *path,
1388                 const char *interface,
1389                 const char *property,
1390                 sd_bus_message *reply,
1391                 void *userdata,
1392                 sd_bus_error *error) {
1393
1394         int64_t l = *(long*) userdata;
1395
1396         return sd_bus_message_append_basic(reply, 'x', &l);
1397 }
1398
1399 int bus_property_get_ulong(
1400                 sd_bus *bus,
1401                 const char *path,
1402                 const char *interface,
1403                 const char *property,
1404                 sd_bus_message *reply,
1405                 void *userdata,
1406                 sd_bus_error *error) {
1407
1408         uint64_t ul = *(unsigned long*) userdata;
1409
1410         return sd_bus_message_append_basic(reply, 't', &ul);
1411 }
1412 #endif
1413
1414 int bus_log_parse_error(int r) {
1415         return log_error_errno(r, "Failed to parse bus message: %m");
1416 }
1417
1418 int bus_log_create_error(int r) {
1419         return log_error_errno(r, "Failed to create bus message: %m");
1420 }
1421
1422 /**
1423  * bus_path_encode_unique() - encode unique object path
1424  * @b: bus connection or NULL
1425  * @prefix: object path prefix
1426  * @sender_id: unique-name of client, or NULL
1427  * @external_id: external ID to be chosen by client, or NULL
1428  * @ret_path: storage for encoded object path pointer
1429  *
1430  * Whenever we provide a bus API that allows clients to create and manage
1431  * server-side objects, we need to provide a unique name for these objects. If
1432  * we let the server choose the name, we suffer from a race condition: If a
1433  * client creates an object asynchronously, it cannot destroy that object until
1434  * it received the method reply. It cannot know the name of the new object,
1435  * thus, it cannot destroy it. Furthermore, it enforces a round-trip.
1436  *
1437  * Therefore, many APIs allow the client to choose the unique name for newly
1438  * created objects. There're two problems to solve, though:
1439  *    1) Object names are usually defined via dbus object paths, which are
1440  *       usually globally namespaced. Therefore, multiple clients must be able
1441  *       to choose unique object names without interference.
1442  *    2) If multiple libraries share the same bus connection, they must be
1443  *       able to choose unique object names without interference.
1444  * The first problem is solved easily by prefixing a name with the
1445  * unique-bus-name of a connection. The server side must enforce this and
1446  * reject any other name. The second problem is solved by providing unique
1447  * suffixes from within sd-bus.
1448  *
1449  * This helper allows clients to create unique object-paths. It uses the
1450  * template '/prefix/sender_id/external_id' and returns the new path in
1451  * @ret_path (must be freed by the caller).
1452  * If @sender_id is NULL, the unique-name of @b is used. If @external_id is
1453  * NULL, this function allocates a unique suffix via @b (by requesting a new
1454  * cookie). If both @sender_id and @external_id are given, @b can be passed as
1455  * NULL.
1456  *
1457  * Returns: 0 on success, negative error code on failure.
1458  */
1459 int bus_path_encode_unique(sd_bus *b, const char *prefix, const char *sender_id, const char *external_id, char **ret_path) {
1460         _cleanup_free_ char *sender_label = NULL, *external_label = NULL;
1461         char external_buf[DECIMAL_STR_MAX(uint64_t)], *p;
1462         int r;
1463
1464         assert_return(b || (sender_id && external_id), -EINVAL);
1465         assert_return(object_path_is_valid(prefix), -EINVAL);
1466         assert_return(ret_path, -EINVAL);
1467
1468         if (!sender_id) {
1469                 r = sd_bus_get_unique_name(b, &sender_id);
1470                 if (r < 0)
1471                         return r;
1472         }
1473
1474         if (!external_id) {
1475                 xsprintf(external_buf, "%"PRIu64, ++b->cookie);
1476                 external_id = external_buf;
1477         }
1478
1479         sender_label = bus_label_escape(sender_id);
1480         if (!sender_label)
1481                 return -ENOMEM;
1482
1483         external_label = bus_label_escape(external_id);
1484         if (!external_label)
1485                 return -ENOMEM;
1486
1487         p = strjoin(prefix, "/", sender_label, "/", external_label);
1488         if (!p)
1489                 return -ENOMEM;
1490
1491         *ret_path = p;
1492         return 0;
1493 }
1494
1495 /**
1496  * bus_path_decode_unique() - decode unique object path
1497  * @path: object path to decode
1498  * @prefix: object path prefix
1499  * @ret_sender: output parameter for sender-id label
1500  * @ret_external: output parameter for external-id label
1501  *
1502  * This does the reverse of bus_path_encode_unique() (see its description for
1503  * details). Both trailing labels, sender-id and external-id, are unescaped and
1504  * returned in the given output parameters (the caller must free them).
1505  *
1506  * Note that this function returns 0 if the path does not match the template
1507  * (see bus_path_encode_unique()), 1 if it matched.
1508  *
1509  * Returns: Negative error code on failure, 0 if the given object path does not
1510  *          match the template (return parameters are set to NULL), 1 if it was
1511  *          parsed successfully (return parameters contain allocated labels).
1512  */
1513 int bus_path_decode_unique(const char *path, const char *prefix, char **ret_sender, char **ret_external) {
1514         const char *p, *q;
1515         char *sender, *external;
1516
1517         assert(object_path_is_valid(path));
1518         assert(object_path_is_valid(prefix));
1519         assert(ret_sender);
1520         assert(ret_external);
1521
1522         p = object_path_startswith(path, prefix);
1523         if (!p) {
1524                 *ret_sender = NULL;
1525                 *ret_external = NULL;
1526                 return 0;
1527         }
1528
1529         q = strchr(p, '/');
1530         if (!q) {
1531                 *ret_sender = NULL;
1532                 *ret_external = NULL;
1533                 return 0;
1534         }
1535
1536         sender = bus_label_unescape_n(p, q - p);
1537         external = bus_label_unescape(q + 1);
1538         if (!sender || !external) {
1539                 free(sender);
1540                 free(external);
1541                 return -ENOMEM;
1542         }
1543
1544         *ret_sender = sender;
1545         *ret_external = external;
1546         return 1;
1547 }
1548
1549 int bus_property_get_rlimit(
1550                 sd_bus *bus,
1551                 const char *path,
1552                 const char *interface,
1553                 const char *property,
1554                 sd_bus_message *reply,
1555                 void *userdata,
1556                 sd_bus_error *error) {
1557
1558         struct rlimit *rl;
1559         uint64_t u;
1560         rlim_t x;
1561         const char *is_soft;
1562
1563         assert(bus);
1564         assert(reply);
1565         assert(userdata);
1566
1567         is_soft = endswith(property, "Soft");
1568         rl = *(struct rlimit**) userdata;
1569         if (rl)
1570                 x = is_soft ? rl->rlim_cur : rl->rlim_max;
1571         else {
1572                 struct rlimit buf = {};
1573                 int z;
1574                 const char *s;
1575
1576                 s = is_soft ? strndupa(property, is_soft - property) : property;
1577
1578                 z = rlimit_from_string(strstr(s, "Limit"));
1579                 assert(z >= 0);
1580
1581                 getrlimit(z, &buf);
1582                 x = is_soft ? buf.rlim_cur : buf.rlim_max;
1583         }
1584
1585         /* rlim_t might have different sizes, let's map
1586          * RLIMIT_INFINITY to (uint64_t) -1, so that it is the same on
1587          * all archs */
1588         u = x == RLIM_INFINITY ? (uint64_t) -1 : (uint64_t) x;
1589
1590         return sd_bus_message_append(reply, "t", u);
1591 }
1592
1593 int bus_track_add_name_many(sd_bus_track *t, char **l) {
1594         int r = 0;
1595         char **i;
1596
1597         assert(t);
1598
1599         /* Continues adding after failure, and returns the first failure. */
1600
1601         STRV_FOREACH(i, l) {
1602                 int k;
1603
1604                 k = sd_bus_track_add_name(t, *i);
1605                 if (k < 0 && r >= 0)
1606                         r = k;
1607         }
1608
1609         return r;
1610 }