src/libsystemd-bus/bus-message.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2013 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU Lesser General Public License as published by
  10   the Free Software Foundation; either version 2.1 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   Lesser General Public License for more details.
  17
  18   You should have received a copy of the GNU Lesser General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <errno.h>
  23 #include <fcntl.h>
  24 #include <sys/mman.h>
  25
  26 #include "util.h"
  27 #include "utf8.h"
  28 #include "strv.h"
  29 #include "time-util.h"
  30 #include "cgroup-util.h"
  31
  32 #include "sd-bus.h"
  33 #include "bus-message.h"
  34 #include "bus-internal.h"
  35 #include "bus-type.h"
  36 #include "bus-signature.h"
  37
  38 static int message_append_basic(sd_bus_message *m, char type, const void *p, const void **stored);
  39
  40 static void *adjust_pointer(const void *p, void *old_base, size_t sz, void *new_base) {
  41
  42         if (p == NULL)
  43                 return NULL;
  44
  45         if (old_base == new_base)
  46                 return (void*) p;
  47
  48         if ((uint8_t*) p < (uint8_t*) old_base)
  49                 return (void*) p;
  50
  51         if ((uint8_t*) p >= (uint8_t*) old_base + sz)
  52                 return (void*) p;
  53
  54         return (uint8_t*) new_base + ((uint8_t*) p - (uint8_t*) old_base);
  55 }
  56
  57 static void message_free_part(sd_bus_message *m, struct bus_body_part *part) {
  58         assert(m);
  59         assert(part);
  60
  61         if (part->memfd >= 0) {
  62                 /* If we can reuse the memfd, try that. For that it
  63                  * can't be sealed yet. */
  64
  65                 if (!part->sealed)
  66                         bus_kernel_push_memfd(m->bus, part->memfd, part->data, part->mapped);
  67                 else {
  68                         if (part->mapped > 0)
  69                                 assert_se(munmap(part->data, part->mapped) == 0);
  70
  71                         close_nointr_nofail(part->memfd);
  72                 }
  73
  74         } else if (part->munmap_this)
  75                 munmap(part->data, part->mapped);
  76         else if (part->free_this)
  77                 free(part->data);
  78
  79         if (part != &m->body)
  80                 free(part);
  81 }
  82
  83 static void message_reset_parts(sd_bus_message *m) {
  84         struct bus_body_part *part;
  85
  86         assert(m);
  87
  88         part = &m->body;
  89         while (m->n_body_parts > 0) {
  90                 struct bus_body_part *next = part->next;
  91                 message_free_part(m, part);
  92                 part = next;
  93                 m->n_body_parts--;
  94         }
  95
  96         m->body_end = NULL;
  97
  98         m->cached_rindex_part = NULL;
  99         m->cached_rindex_part_begin = 0;
 100 }
 101
 102 static void message_reset_containers(sd_bus_message *m) {
 103         unsigned i;
 104
 105         assert(m);
 106
 107         for (i = 0; i < m->n_containers; i++)
 108                 free(m->containers[i].signature);
 109
 110         free(m->containers);
 111         m->containers = NULL;
 112
 113         m->n_containers = 0;
 114         m->root_container.index = 0;
 115 }
 116
 117 static void message_free(sd_bus_message *m) {
 118         assert(m);
 119
 120         if (m->free_header)
 121                 free(m->header);
 122
 123         message_reset_parts(m);
 124
 125         if (m->free_kdbus)
 126                 free(m->kdbus);
 127
 128         if (m->release_kdbus) {
 129                 uint64_t off;
 130
 131                 off = (uint8_t *)m->kdbus - (uint8_t *)m->bus->kdbus_buffer;
 132                 ioctl(m->bus->input_fd, KDBUS_CMD_MSG_RELEASE, &off);
 133         }
 134
 135         if (m->bus)
 136                 sd_bus_unref(m->bus);
 137
 138         if (m->free_fds) {
 139                 close_many(m->fds, m->n_fds);
 140                 free(m->fds);
 141         }
 142
 143         if (m->iovec != m->iovec_fixed)
 144                 free(m->iovec);
 145
 146         free(m->cmdline_array);
 147
 148         message_reset_containers(m);
 149         free(m->root_container.signature);
 150
 151         free(m->peeked_signature);
 152
 153         free(m->unit);
 154         free(m->user_unit);
 155         free(m->session);
 156         free(m);
 157 }
 158
 159 static void *message_extend_fields(sd_bus_message *m, size_t align, size_t sz) {
 160         void *op, *np;
 161         size_t old_size, new_size, start;
 162
 163         assert(m);
 164
 165         if (m->poisoned)
 166                 return NULL;
 167
 168         old_size = sizeof(struct bus_header) + m->header->fields_size;
 169         start = ALIGN_TO(old_size, align);
 170         new_size = start + sz;
 171
 172         if (old_size == new_size)
 173                 return (uint8_t*) m->header + old_size;
 174
 175         if (new_size > (size_t) ((uint32_t) -1))
 176                 goto poison;
 177
 178         if (m->free_header) {
 179                 np = realloc(m->header, ALIGN8(new_size));
 180                 if (!np)
 181                         goto poison;
 182         } else {
 183                 /* Initially, the header is allocated as part of of
 184                  * the sd_bus_message itself, let's replace it by
 185                  * dynamic data */
 186
 187                 np = malloc(ALIGN8(new_size));
 188                 if (!np)
 189                         goto poison;
 190
 191                 memcpy(np, m->header, sizeof(struct bus_header));
 192         }
 193
 194         /* Zero out padding */
 195         if (start > old_size)
 196                 memset((uint8_t*) np + old_size, 0, start - old_size);
 197
 198         op = m->header;
 199         m->header = np;
 200         m->header->fields_size = new_size - sizeof(struct bus_header);
 201
 202         /* Adjust quick access pointers */
 203         m->path = adjust_pointer(m->path, op, old_size, m->header);
 204         m->interface = adjust_pointer(m->interface, op, old_size, m->header);
 205         m->member = adjust_pointer(m->member, op, old_size, m->header);
 206         m->destination = adjust_pointer(m->destination, op, old_size, m->header);
 207         m->sender = adjust_pointer(m->sender, op, old_size, m->header);
 208         m->error.name = adjust_pointer(m->error.name, op, old_size, m->header);
 209
 210         m->free_header = true;
 211
 212         return (uint8_t*) np + start;
 213
 214 poison:
 215         m->poisoned = true;
 216         return NULL;
 217 }
 218
 219 static int message_append_field_string(
 220                 sd_bus_message *m,
 221                 uint8_t h,
 222                 char type,
 223                 const char *s,
 224                 const char **ret) {
 225
 226         size_t l;
 227         uint8_t *p;
 228
 229         assert(m);
 230
 231         l = strlen(s);
 232         if (l > (size_t) (uint32_t) -1)
 233                 return -EINVAL;
 234
 235         /* field id byte + signature length + signature 's' + NUL + string length + string + NUL */
 236         p = message_extend_fields(m, 8, 4 + 4 + l + 1);
 237         if (!p)
 238                 return -ENOMEM;
 239
 240         p[0] = h;
 241         p[1] = 1;
 242         p[2] = type;
 243         p[3] = 0;
 244
 245         ((uint32_t*) p)[1] = l;
 246         memcpy(p + 8, s, l + 1);
 247
 248         if (ret)
 249                 *ret = (char*) p + 8;
 250
 251         return 0;
 252 }
 253
 254 static int message_append_field_signature(
 255                 sd_bus_message *m,
 256                 uint8_t h,
 257                 const char *s,
 258                 const char **ret) {
 259
 260         size_t l;
 261         uint8_t *p;
 262
 263         assert(m);
 264
 265         l = strlen(s);
 266         if (l > 255)
 267                 return -EINVAL;
 268
 269         /* field id byte + signature length + signature 'g' + NUL + string length + string + NUL */
 270         p = message_extend_fields(m, 8, 4 + 1 + l + 1);
 271         if (!p)
 272                 return -ENOMEM;
 273
 274         p[0] = h;
 275         p[1] = 1;
 276         p[2] = SD_BUS_TYPE_SIGNATURE;
 277         p[3] = 0;
 278         p[4] = l;
 279         memcpy(p + 5, s, l + 1);
 280
 281         if (ret)
 282                 *ret = (const char*) p + 5;
 283
 284         return 0;
 285 }
 286
 287 static int message_append_field_uint32(sd_bus_message *m, uint8_t h, uint32_t x) {
 288         uint8_t *p;
 289
 290         assert(m);
 291
 292         /* field id byte + signature length + signature 'u' + NUL + value */
 293         p = message_extend_fields(m, 8, 4 + 4);
 294         if (!p)
 295                 return -ENOMEM;
 296
 297         p[0] = h;
 298         p[1] = 1;
 299         p[2] = SD_BUS_TYPE_UINT32;
 300         p[3] = 0;
 301
 302         ((uint32_t*) p)[1] = x;
 303
 304         return 0;
 305 }
 306
 307 int bus_message_from_header(
 308                 void *buffer,
 309                 size_t length,
 310                 int *fds,
 311                 unsigned n_fds,
 312                 const struct ucred *ucred,
 313                 const char *label,
 314                 size_t extra,
 315                 sd_bus_message **ret) {
 316
 317         sd_bus_message *m;
 318         struct bus_header *h;
 319         size_t a, label_sz;
 320
 321         assert(buffer || length <= 0);
 322         assert(fds || n_fds <= 0);
 323         assert(ret);
 324
 325         if (length < sizeof(struct bus_header))
 326                 return -EBADMSG;
 327
 328         h = buffer;
 329         if (h->version != 1)
 330                 return -EBADMSG;
 331
 332         if (h->serial == 0)
 333                 return -EBADMSG;
 334
 335         if (h->type == _SD_BUS_MESSAGE_TYPE_INVALID)
 336                 return -EBADMSG;
 337
 338         if (h->endian != SD_BUS_LITTLE_ENDIAN &&
 339             h->endian != SD_BUS_BIG_ENDIAN)
 340                 return -EBADMSG;
 341
 342         a = ALIGN(sizeof(sd_bus_message)) + ALIGN(extra);
 343
 344         if (label) {
 345                 label_sz = strlen(label);
 346                 a += label_sz + 1;
 347         }
 348
 349         m = malloc0(a);
 350         if (!m)
 351                 return -ENOMEM;
 352
 353         m->n_ref = 1;
 354         m->sealed = true;
 355         m->header = h;
 356         m->fds = fds;
 357         m->n_fds = n_fds;
 358
 359         if (ucred) {
 360                 m->uid = ucred->uid;
 361                 m->pid = ucred->pid;
 362                 m->gid = ucred->gid;
 363                 m->uid_valid = m->gid_valid = true;
 364         }
 365
 366         if (label) {
 367                 m->label = (char*) m + ALIGN(sizeof(sd_bus_message)) + ALIGN(extra);
 368                 memcpy(m->label, label, label_sz + 1);
 369         }
 370
 371         *ret = m;
 372         return 0;
 373 }
 374
 375 int bus_message_from_malloc(
 376                 void *buffer,
 377                 size_t length,
 378                 int *fds,
 379                 unsigned n_fds,
 380                 const struct ucred *ucred,
 381                 const char *label,
 382                 sd_bus_message **ret) {
 383
 384         sd_bus_message *m;
 385         int r;
 386
 387         r = bus_message_from_header(buffer, length, fds, n_fds, ucred, label, 0, &m);
 388         if (r < 0)
 389                 return r;
 390
 391         if (length != BUS_MESSAGE_SIZE(m)) {
 392                 r = -EBADMSG;
 393                 goto fail;
 394         }
 395
 396         m->n_body_parts = 1;
 397         m->body.data = (uint8_t*) buffer + sizeof(struct bus_header) + ALIGN8(BUS_MESSAGE_FIELDS_SIZE(m));
 398         m->body.size = length - sizeof(struct bus_header) - ALIGN8(BUS_MESSAGE_FIELDS_SIZE(m));
 399         m->body.sealed = true;
 400         m->body.memfd = -1;
 401
 402         m->n_iovec = 1;
 403         m->iovec = m->iovec_fixed;
 404         m->iovec[0].iov_base = buffer;
 405         m->iovec[0].iov_len = length;
 406
 407         r = bus_message_parse_fields(m);
 408         if (r < 0)
 409                 goto fail;
 410
 411         /* We take possession of the memory and fds now */
 412         m->free_header = true;
 413         m->free_fds = true;
 414
 415         *ret = m;
 416         return 0;
 417
 418 fail:
 419         message_free(m);
 420         return r;
 421 }
 422
 423 static sd_bus_message *message_new(sd_bus *bus, uint8_t type) {
 424         sd_bus_message *m;
 425
 426         m = malloc0(ALIGN(sizeof(sd_bus_message)) + sizeof(struct bus_header));
 427         if (!m)
 428                 return NULL;
 429
 430         m->n_ref = 1;
 431         m->header = (struct bus_header*) ((uint8_t*) m + ALIGN(sizeof(struct sd_bus_message)));
 432         m->header->endian = SD_BUS_NATIVE_ENDIAN;
 433         m->header->type = type;
 434         m->header->version = bus ? bus->message_version : 1;
 435         m->allow_fds = !bus || bus->can_fds || (bus->state != BUS_HELLO && bus->state != BUS_RUNNING);
 436
 437         if (bus)
 438                 m->bus = sd_bus_ref(bus);
 439
 440         return m;
 441 }
 442
 443 int sd_bus_message_new_signal(
 444                 sd_bus *bus,
 445                 const char *path,
 446                 const char *interface,
 447                 const char *member,
 448                 sd_bus_message **m) {
 449
 450         sd_bus_message *t;
 451         int r;
 452
 453         if (!path)
 454                 return -EINVAL;
 455         if (!interface)
 456                 return -EINVAL;
 457         if (!member)
 458                 return -EINVAL;
 459         if (!m)
 460                 return -EINVAL;
 461         if (bus && bus->state == BUS_UNSET)
 462                 return -ENOTCONN;
 463
 464         t = message_new(bus, SD_BUS_MESSAGE_SIGNAL);
 465         if (!t)
 466                 return -ENOMEM;
 467
 468         t->header->flags |= SD_BUS_MESSAGE_NO_REPLY_EXPECTED;
 469
 470         r = message_append_field_string(t, SD_BUS_MESSAGE_HEADER_PATH, SD_BUS_TYPE_OBJECT_PATH, path, &t->path);
 471         if (r < 0)
 472                 goto fail;
 473         r = message_append_field_string(t, SD_BUS_MESSAGE_HEADER_INTERFACE, SD_BUS_TYPE_STRING, interface, &t->interface);
 474         if (r < 0)
 475                 goto fail;
 476         r = message_append_field_string(t, SD_BUS_MESSAGE_HEADER_MEMBER, SD_BUS_TYPE_STRING, member, &t->member);
 477         if (r < 0)
 478                 goto fail;
 479
 480         *m = t;
 481         return 0;
 482
 483 fail:
 484         sd_bus_message_unref(t);
 485         return r;
 486 }
 487
 488 int sd_bus_message_new_method_call(
 489                 sd_bus *bus,
 490                 const char *destination,
 491                 const char *path,
 492                 const char *interface,
 493                 const char *member,
 494                 sd_bus_message **m) {
 495
 496         sd_bus_message *t;
 497         int r;
 498
 499         if (destination && !service_name_is_valid(destination))
 500                 return -EINVAL;
 501         if (!object_path_is_valid(path))
 502                 return -EINVAL;
 503         if (interface && !interface_name_is_valid(interface))
 504                 return -EINVAL;
 505         if (!member_name_is_valid(member))
 506                 return -EINVAL;
 507         if (!m)
 508                 return -EINVAL;
 509         if (bus && bus->state == BUS_UNSET)
 510                 return -ENOTCONN;
 511
 512         t = message_new(bus, SD_BUS_MESSAGE_METHOD_CALL);
 513         if (!t)
 514                 return -ENOMEM;
 515
 516         r = message_append_field_string(t, SD_BUS_MESSAGE_HEADER_PATH, SD_BUS_TYPE_OBJECT_PATH, path, &t->path);
 517         if (r < 0)
 518                 goto fail;
 519         r = message_append_field_string(t, SD_BUS_MESSAGE_HEADER_MEMBER, SD_BUS_TYPE_STRING, member, &t->member);
 520         if (r < 0)
 521                 goto fail;
 522
 523         if (interface) {
 524                 r = message_append_field_string(t, SD_BUS_MESSAGE_HEADER_INTERFACE, SD_BUS_TYPE_STRING, interface, &t->interface);
 525                 if (r < 0)
 526                         goto fail;
 527         }
 528
 529         if (destination) {
 530                 r = message_append_field_string(t, SD_BUS_MESSAGE_HEADER_DESTINATION, SD_BUS_TYPE_STRING, destination, &t->destination);
 531                 if (r < 0)
 532                         goto fail;
 533         }
 534
 535         *m = t;
 536         return 0;
 537
 538 fail:
 539         message_free(t);
 540         return r;
 541 }
 542
 543 static int message_new_reply(
 544                 sd_bus *bus,
 545                 sd_bus_message *call,
 546                 uint8_t type,
 547                 sd_bus_message **m) {
 548
 549         sd_bus_message *t;
 550         int r;
 551
 552         if (!call)
 553                 return -EINVAL;
 554         if (!call->sealed)
 555                 return -EPERM;
 556         if (call->header->type != SD_BUS_MESSAGE_METHOD_CALL)
 557                 return -EINVAL;
 558         if (!m)
 559                 return -EINVAL;
 560         if (bus && bus->state == BUS_UNSET)
 561                 return -ENOTCONN;
 562
 563         t = message_new(bus, type);
 564         if (!t)
 565                 return -ENOMEM;
 566
 567         t->header->flags |= SD_BUS_MESSAGE_NO_REPLY_EXPECTED;
 568         t->reply_serial = BUS_MESSAGE_SERIAL(call);
 569
 570         r = message_append_field_uint32(t, SD_BUS_MESSAGE_HEADER_REPLY_SERIAL, t->reply_serial);
 571         if (r < 0)
 572                 goto fail;
 573
 574         if (call->sender) {
 575                 r = message_append_field_string(t, SD_BUS_MESSAGE_HEADER_DESTINATION, SD_BUS_TYPE_STRING, call->sender, &t->destination);
 576                 if (r < 0)
 577                         goto fail;
 578         }
 579
 580         t->dont_send = !!(call->header->flags & SD_BUS_MESSAGE_NO_REPLY_EXPECTED);
 581
 582         *m = t;
 583         return 0;
 584
 585 fail:
 586         message_free(t);
 587         return r;
 588 }
 589
 590 int sd_bus_message_new_method_return(
 591                 sd_bus *bus,
 592                 sd_bus_message *call,
 593                 sd_bus_message **m) {
 594
 595         return message_new_reply(bus, call, SD_BUS_MESSAGE_METHOD_RETURN, m);
 596 }
 597
 598 int sd_bus_message_new_method_error(
 599                 sd_bus *bus,
 600                 sd_bus_message *call,
 601                 const sd_bus_error *e,
 602                 sd_bus_message **m) {
 603
 604         sd_bus_message *t;
 605         int r;
 606
 607         if (!sd_bus_error_is_set(e))
 608                 return -EINVAL;
 609         if (!m)
 610                 return -EINVAL;
 611
 612         r = message_new_reply(bus, call, SD_BUS_MESSAGE_METHOD_ERROR, &t);
 613         if (r < 0)
 614                 return r;
 615
 616         r = message_append_field_string(t, SD_BUS_MESSAGE_HEADER_ERROR_NAME, SD_BUS_TYPE_STRING, e->name, &t->error.name);
 617         if (r < 0)
 618                 goto fail;
 619
 620         if (e->message) {
 621                 r = message_append_basic(t, SD_BUS_TYPE_STRING, e->message, (const void**) &t->error.message);
 622                 if (r < 0)
 623                         goto fail;
 624         }
 625
 626         *m = t;
 627         return 0;
 628
 629 fail:
 630         message_free(t);
 631         return r;
 632 }
 633
 634 int sd_bus_message_new_method_errorf(
 635                 sd_bus *bus,
 636                 sd_bus_message *call,
 637                 sd_bus_message **m,
 638                 const char *name,
 639                 const char *format,
 640                 ...) {
 641
 642         _cleanup_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
 643         va_list ap;
 644         int r;
 645
 646         assert_return(name, -EINVAL);
 647         assert_return(m, -EINVAL);
 648
 649         va_start(ap, format);
 650         r = bus_error_setfv(&error, name, format, ap);
 651         va_end(ap);
 652
 653         if (r < 0)
 654                 return r;
 655
 656         return sd_bus_message_new_method_error(bus, call, &error, m);
 657 }
 658
 659 int sd_bus_message_new_method_errno(
 660                 sd_bus *bus,
 661                 sd_bus_message *call,
 662                 int error,
 663                 const sd_bus_error *p,
 664                 sd_bus_message **m) {
 665
 666         _cleanup_free_ sd_bus_error berror = SD_BUS_ERROR_NULL;
 667
 668         if (sd_bus_error_is_set(p))
 669                 return sd_bus_message_new_method_error(bus, call, p, m);
 670
 671         sd_bus_error_set_errno(&berror, error);
 672
 673         return sd_bus_message_new_method_error(bus, call, &berror, m);
 674 }
 675
 676 int sd_bus_message_new_method_errnof(
 677                 sd_bus *bus,
 678                 sd_bus_message *call,
 679                 sd_bus_message **m,
 680                 int error,
 681                 const char *format,
 682                 ...) {
 683
 684         _cleanup_free_ sd_bus_error berror = SD_BUS_ERROR_NULL;
 685         va_list ap;
 686         int r;
 687
 688         va_start(ap, format);
 689         r = bus_error_set_errnofv(&berror, error, format, ap);
 690         va_end(ap);
 691
 692         if (r < 0)
 693                 return r;
 694
 695         return sd_bus_message_new_method_error(bus, call, &berror, m);
 696 }
 697
 698 int bus_message_new_synthetic_error(
 699                 sd_bus *bus,
 700                 uint64_t serial,
 701                 const sd_bus_error *e,
 702                 sd_bus_message **m) {
 703
 704         sd_bus_message *t;
 705         int r;
 706
 707         assert(sd_bus_error_is_set(e));
 708         assert(m);
 709
 710         t = message_new(bus, SD_BUS_MESSAGE_METHOD_ERROR);
 711         if (!t)
 712                 return -ENOMEM;
 713
 714         t->header->flags |= SD_BUS_MESSAGE_NO_REPLY_EXPECTED;
 715         t->reply_serial = serial;
 716
 717         r = message_append_field_uint32(t, SD_BUS_MESSAGE_HEADER_REPLY_SERIAL, t->reply_serial);
 718         if (r < 0)
 719                 goto fail;
 720
 721         if (bus && bus->unique_name) {
 722                 r = message_append_field_string(t, SD_BUS_MESSAGE_HEADER_DESTINATION, SD_BUS_TYPE_STRING, bus->unique_name, &t->destination);
 723                 if (r < 0)
 724                         goto fail;
 725         }
 726
 727         r = message_append_field_string(t, SD_BUS_MESSAGE_HEADER_ERROR_NAME, SD_BUS_TYPE_STRING, e->name, &t->error.name);
 728         if (r < 0)
 729                 goto fail;
 730
 731         if (e->message) {
 732                 r = message_append_basic(t, SD_BUS_TYPE_STRING, e->message, (const void**) &t->error.message);
 733                 if (r < 0)
 734                         goto fail;
 735         }
 736
 737         *m = t;
 738         return 0;
 739
 740 fail:
 741         message_free(t);
 742         return r;
 743 }
 744
 745 sd_bus_message* sd_bus_message_ref(sd_bus_message *m) {
 746         if (!m)
 747                 return NULL;
 748
 749         assert(m->n_ref > 0);
 750         m->n_ref++;
 751
 752         return m;
 753 }
 754
 755 sd_bus_message* sd_bus_message_unref(sd_bus_message *m) {
 756         if (!m)
 757                 return NULL;
 758
 759         assert(m->n_ref > 0);
 760         m->n_ref--;
 761
 762         if (m->n_ref <= 0)
 763                 message_free(m);
 764
 765         return NULL;
 766 }
 767
 768 int sd_bus_message_get_type(sd_bus_message *m, uint8_t *type) {
 769         if (!m)
 770                 return -EINVAL;
 771         if (!type)
 772                 return -EINVAL;
 773
 774         *type = m->header->type;
 775         return 0;
 776 }
 777
 778 int sd_bus_message_get_serial(sd_bus_message *m, uint64_t *serial) {
 779         if (!m)
 780                 return -EINVAL;
 781         if (!serial)
 782                 return -EINVAL;
 783         if (m->header->serial == 0)
 784                 return -ENOENT;
 785
 786         *serial = BUS_MESSAGE_SERIAL(m);
 787         return 0;
 788 }
 789
 790 int sd_bus_message_get_reply_serial(sd_bus_message *m, uint64_t *serial) {
 791         if (!m)
 792                 return -EINVAL;
 793         if (!serial)
 794                 return -EINVAL;
 795         if (m->reply_serial == 0)
 796                 return -ENOENT;
 797
 798         *serial = m->reply_serial;
 799         return 0;
 800 }
 801
 802 int sd_bus_message_get_no_reply(sd_bus_message *m) {
 803         if (!m)
 804                 return -EINVAL;
 805
 806         return m->header->type == SD_BUS_MESSAGE_METHOD_CALL ? !!(m->header->flags & SD_BUS_MESSAGE_NO_REPLY_EXPECTED) : 0;
 807 }
 808
 809 const char *sd_bus_message_get_path(sd_bus_message *m) {
 810         if (!m)
 811                 return NULL;
 812
 813         return m->path;
 814 }
 815
 816 const char *sd_bus_message_get_interface(sd_bus_message *m) {
 817         if (!m)
 818                 return NULL;
 819
 820         return m->interface;
 821 }
 822
 823 const char *sd_bus_message_get_member(sd_bus_message *m) {
 824         if (!m)
 825                 return NULL;
 826
 827         return m->member;
 828 }
 829 const char *sd_bus_message_get_destination(sd_bus_message *m) {
 830         if (!m)
 831                 return NULL;
 832
 833         return m->destination;
 834 }
 835
 836 const char *sd_bus_message_get_sender(sd_bus_message *m) {
 837         if (!m)
 838                 return NULL;
 839
 840         return m->sender;
 841 }
 842
 843 const sd_bus_error *sd_bus_message_get_error(sd_bus_message *m) {
 844         if (!m)
 845                 return NULL;
 846
 847         if (!sd_bus_error_is_set(&m->error))
 848                 return NULL;
 849
 850         return &m->error;
 851 }
 852
 853 int sd_bus_message_get_uid(sd_bus_message *m, uid_t *uid) {
 854         if (!m)
 855                 return -EINVAL;
 856         if (!uid)
 857                 return -EINVAL;
 858         if (!m->uid_valid)
 859                 return -ESRCH;
 860
 861         *uid = m->uid;
 862         return 0;
 863 }
 864
 865 int sd_bus_message_get_gid(sd_bus_message *m, gid_t *gid) {
 866         if (!m)
 867                 return -EINVAL;
 868         if (!gid)
 869                 return -EINVAL;
 870         if (!m->gid_valid)
 871                 return -ESRCH;
 872
 873         *gid = m->gid;
 874         return 0;
 875 }
 876
 877 int sd_bus_message_get_pid(sd_bus_message *m, pid_t *pid) {
 878         if (!m)
 879                 return -EINVAL;
 880         if (!pid)
 881                 return -EINVAL;
 882         if (m->pid <= 0)
 883                 return -ESRCH;
 884
 885         *pid = m->pid;
 886         return 0;
 887 }
 888
 889 int sd_bus_message_get_tid(sd_bus_message *m, pid_t *tid) {
 890         if (!m)
 891                 return -EINVAL;
 892         if (!tid)
 893                 return -EINVAL;
 894         if (m->tid <= 0)
 895                 return -ESRCH;
 896
 897         *tid = m->tid;
 898         return 0;
 899 }
 900
 901 int sd_bus_message_get_pid_starttime(sd_bus_message *m, uint64_t *usec) {
 902         if (!m)
 903                 return -EINVAL;
 904         if (!usec)
 905                 return -EINVAL;
 906         if (m->pid_starttime <= 0)
 907                 return -ESRCH;
 908
 909         *usec = m->pid_starttime;
 910         return 0;
 911 }
 912
 913 int sd_bus_message_get_selinux_context(sd_bus_message *m, const char **ret) {
 914         if (!m)
 915                 return -EINVAL;
 916         if (!m->label)
 917                 return -ESRCH;
 918
 919         *ret = m->label;
 920         return 0;
 921 }
 922
 923 int sd_bus_message_get_monotonic_timestamp(sd_bus_message *m, uint64_t *usec) {
 924         if (!m)
 925                 return -EINVAL;
 926         if (!usec)
 927                 return -EINVAL;
 928         if (m->monotonic <= 0)
 929                 return -ESRCH;
 930
 931         *usec = m->monotonic;
 932         return 0;
 933 }
 934
 935 int sd_bus_message_get_realtime_timestamp(sd_bus_message *m, uint64_t *usec) {
 936         if (!m)
 937                 return -EINVAL;
 938         if (!usec)
 939                 return -EINVAL;
 940         if (m->realtime <= 0)
 941                 return -ESRCH;
 942
 943         *usec = m->realtime;
 944         return 0;
 945 }
 946
 947 int sd_bus_message_get_comm(sd_bus_message *m, const char **ret) {
 948         if (!m)
 949                 return -EINVAL;
 950         if (!ret)
 951                 return -EINVAL;
 952         if (!m->comm)
 953                 return -ESRCH;
 954
 955         *ret = m->comm;
 956         return 0;
 957 }
 958
 959 int sd_bus_message_get_tid_comm(sd_bus_message *m, const char **ret) {
 960         if (!m)
 961                 return -EINVAL;
 962         if (!ret)
 963                 return -EINVAL;
 964         if (!m->tid_comm)
 965                 return -ESRCH;
 966
 967         *ret = m->tid_comm;
 968         return 0;
 969 }
 970
 971 int sd_bus_message_get_exe(sd_bus_message *m, const char **ret) {
 972         if (!m)
 973                 return -EINVAL;
 974         if (!ret)
 975                 return -EINVAL;
 976         if (!m->exe)
 977                 return -ESRCH;
 978
 979         *ret = m->exe;
 980         return 0;
 981 }
 982
 983 int sd_bus_message_get_cgroup(sd_bus_message *m, const char **ret) {
 984         if (!m)
 985                 return -EINVAL;
 986         if (!ret)
 987                 return -EINVAL;
 988         if (!m->cgroup)
 989                 return -ESRCH;
 990
 991         *ret = m->cgroup;
 992         return 0;
 993 }
 994
 995 int sd_bus_message_get_unit(sd_bus_message *m, const char **ret) {
 996         int r;
 997
 998         if (!m)
 999                 return -EINVAL;
1000         if (!ret)
1001                 return -EINVAL;
1002         if (!m->cgroup)
1003                 return -ESRCH;
1004
1005         if (!m->unit) {
1006                 r = cg_path_get_unit(m->cgroup, &m->unit);
1007                 if (r < 0)
1008                         return r;
1009         }
1010
1011         *ret = m->unit;
1012         return 0;
1013 }
1014
1015 int sd_bus_message_get_user_unit(sd_bus_message *m, const char **ret) {
1016         int r;
1017
1018         if (!m)
1019                 return -EINVAL;
1020         if (!ret)
1021                 return -EINVAL;
1022         if (!m->cgroup)
1023                 return -ESRCH;
1024
1025         if (!m->user_unit) {
1026                 r = cg_path_get_user_unit(m->cgroup, &m->user_unit);
1027                 if (r < 0)
1028                         return r;
1029         }
1030
1031         *ret = m->user_unit;
1032         return 0;
1033 }
1034
1035 int sd_bus_message_get_session(sd_bus_message *m, const char **ret) {
1036         int r;
1037
1038         if (!m)
1039                 return -EINVAL;
1040         if (!ret)
1041                 return -EINVAL;
1042         if (!m->cgroup)
1043                 return -ESRCH;
1044
1045         if (!m->session) {
1046                 r = cg_path_get_session(m->cgroup, &m->session);
1047                 if (r < 0)
1048                         return r;
1049         }
1050
1051         *ret = m->session;
1052         return 0;
1053 }
1054
1055 int sd_bus_message_get_owner_uid(sd_bus_message *m, uid_t *uid) {
1056         if (!m)
1057                 return -EINVAL;
1058         if (!uid)
1059                 return -EINVAL;
1060         if (!m->cgroup)
1061                 return -ESRCH;
1062
1063         return cg_path_get_owner_uid(m->cgroup, uid);
1064 }
1065
1066 int sd_bus_message_get_cmdline(sd_bus_message *m, char ***cmdline) {
1067         size_t n, i;
1068         const char *p;
1069         bool first;
1070
1071         if (!m)
1072                 return -EINVAL;
1073
1074         if (!m->cmdline)
1075                 return -ENOENT;
1076
1077         for (p = m->cmdline, n = 0; p < m->cmdline + m->cmdline_length; p++)
1078                 if (*p == 0)
1079                         n++;
1080
1081         m->cmdline_array = new(char*, n + 1);
1082         if (!m->cmdline_array)
1083                 return -ENOMEM;
1084
1085         for (p = m->cmdline, i = 0, first = true; p < m->cmdline + m->cmdline_length; p++) {
1086                 if (first)
1087                         m->cmdline_array[i++] = (char*) p;
1088
1089                 first = *p == 0;
1090         }
1091
1092         m->cmdline_array[i] = NULL;
1093         *cmdline = m->cmdline_array;
1094
1095         return 0;
1096 }
1097
1098 int sd_bus_message_get_audit_sessionid(sd_bus_message *m, uint32_t *sessionid) {
1099         if (!m)
1100                 return -EINVAL;
1101         if (!sessionid)
1102                 return -EINVAL;
1103         if (!m->audit)
1104                 return -ESRCH;
1105
1106         *sessionid = m->audit->sessionid;
1107         return 0;
1108 }
1109
1110 int sd_bus_message_get_audit_loginuid(sd_bus_message *m, uid_t *uid) {
1111         if (!m)
1112                 return -EINVAL;
1113         if (!uid)
1114                 return -EINVAL;
1115         if (!m->audit)
1116                 return -ESRCH;
1117
1118         *uid = m->audit->loginuid;
1119         return 0;
1120 }
1121
1122 int sd_bus_message_has_effective_cap(sd_bus_message *m, int capability) {
1123         unsigned sz;
1124
1125         if (!m)
1126                 return -EINVAL;
1127         if (capability < 0)
1128                 return -EINVAL;
1129         if (!m->capability)
1130                 return -ESRCH;
1131
1132         sz = m->capability_size / 4;
1133         if ((unsigned) capability >= sz*8)
1134                 return 0;
1135
1136         return !!(m->capability[2 * sz + (capability / 8)] & (1 << (capability % 8)));
1137 }
1138
1139 int sd_bus_message_is_signal(sd_bus_message *m, const char *interface, const char *member) {
1140         if (!m)
1141                 return -EINVAL;
1142
1143         if (m->header->type != SD_BUS_MESSAGE_SIGNAL)
1144                 return 0;
1145
1146         if (interface && (!m->interface || !streq(m->interface, interface)))
1147                 return 0;
1148
1149         if (member &&  (!m->member || !streq(m->member, member)))
1150                 return 0;
1151
1152         return 1;
1153 }
1154
1155 int sd_bus_message_is_method_call(sd_bus_message *m, const char *interface, const char *member) {
1156         if (!m)
1157                 return -EINVAL;
1158
1159         if (m->header->type != SD_BUS_MESSAGE_METHOD_CALL)
1160                 return 0;
1161
1162         if (interface && (!m->interface || !streq(m->interface, interface)))
1163                 return 0;
1164
1165         if (member &&  (!m->member || !streq(m->member, member)))
1166                 return 0;
1167
1168         return 1;
1169 }
1170
1171 int sd_bus_message_is_method_error(sd_bus_message *m, const char *name) {
1172         if (!m)
1173                 return -EINVAL;
1174
1175         if (m->header->type != SD_BUS_MESSAGE_METHOD_ERROR)
1176                 return 0;
1177
1178         if (name && (!m->error.name || !streq(m->error.name, name)))
1179                 return 0;
1180
1181         return 1;
1182 }
1183
1184 int sd_bus_message_set_no_reply(sd_bus_message *m, int b) {
1185         if (!m)
1186                 return -EINVAL;
1187         if (m->sealed)
1188                 return -EPERM;
1189         if (m->header->type != SD_BUS_MESSAGE_METHOD_CALL)
1190                 return -EPERM;
1191
1192         if (b)
1193                 m->header->flags |= SD_BUS_MESSAGE_NO_REPLY_EXPECTED;
1194         else
1195                 m->header->flags &= ~SD_BUS_MESSAGE_NO_REPLY_EXPECTED;
1196
1197         return 0;
1198 }
1199
1200 static struct bus_container *message_get_container(sd_bus_message *m) {
1201         assert(m);
1202
1203         if (m->n_containers == 0)
1204                 return &m->root_container;
1205
1206         assert(m->containers);
1207         return m->containers + m->n_containers - 1;
1208 }
1209
1210 struct bus_body_part *message_append_part(sd_bus_message *m) {
1211         struct bus_body_part *part;
1212
1213         assert(m);
1214
1215         if (m->poisoned)
1216                 return NULL;
1217
1218         if (m->n_body_parts <= 0) {
1219                 part = &m->body;
1220                 zero(*part);
1221         } else {
1222                 assert(m->body_end);
1223
1224                 part = new0(struct bus_body_part, 1);
1225                 if (!part) {
1226                         m->poisoned = true;
1227                         return NULL;
1228                 }
1229
1230                 m->body_end->next = part;
1231         }
1232
1233         part->memfd = -1;
1234         m->body_end = part;
1235         m->n_body_parts ++;
1236
1237         return part;
1238 }
1239
1240 static void part_zero(struct bus_body_part *part, size_t sz) {
1241         assert(part);
1242         assert(sz > 0);
1243         assert(sz < 8);
1244
1245         /* All other fields can be left in their defaults */
1246         assert(!part->data);
1247         assert(part->memfd < 0);
1248
1249         part->size = sz;
1250         part->is_zero = true;
1251         part->sealed = true;
1252 }
1253
1254 static int part_make_space(
1255                 struct sd_bus_message *m,
1256                 struct bus_body_part *part,
1257                 size_t sz,
1258                 void **q) {
1259
1260         void *n;
1261         int r;
1262
1263         assert(m);
1264         assert(part);
1265         assert(!part->sealed);
1266
1267         if (m->poisoned)
1268                 return -ENOMEM;
1269
1270         if (!part->data && part->memfd < 0)
1271                 part->memfd = bus_kernel_pop_memfd(m->bus, &part->data, &part->mapped);
1272
1273         if (part->memfd >= 0) {
1274                 uint64_t u = sz;
1275
1276                 r = ioctl(part->memfd, KDBUS_CMD_MEMFD_SIZE_SET, &u);
1277                 if (r < 0) {
1278                         m->poisoned = true;
1279                         return -errno;
1280                 }
1281
1282                 if (!part->data || sz > part->mapped) {
1283                         size_t psz = PAGE_ALIGN(sz > 0 ? sz : 1);
1284
1285                         if (part->mapped <= 0)
1286                                 n = mmap(NULL, psz, PROT_READ|PROT_WRITE, MAP_SHARED, part->memfd, 0);
1287                         else
1288                                 n = mremap(part->data, part->mapped, psz, MREMAP_MAYMOVE);
1289
1290                         if (n == MAP_FAILED) {
1291                                 m->poisoned = true;
1292                                 return -errno;
1293                         }
1294
1295                         part->mapped = psz;
1296                         part->data = n;
1297                 }
1298
1299                 part->munmap_this = true;
1300         } else {
1301                 n = realloc(part->data, MAX(sz, 1u));
1302                 if (!n) {
1303                         m->poisoned = true;
1304                         return -ENOMEM;
1305                 }
1306
1307                 part->data = n;
1308                 part->free_this = true;
1309         }
1310
1311         if (q)
1312                 *q = part->data ? (uint8_t*) part->data + part->size : NULL;
1313
1314         part->size = sz;
1315         return 0;
1316 }
1317
1318 static void message_extend_containers(sd_bus_message *m, size_t expand) {
1319         struct bus_container *c;
1320
1321         assert(m);
1322
1323         if (expand <= 0)
1324                 return;
1325
1326         /* Update counters */
1327         for (c = m->containers; c < m->containers + m->n_containers; c++)
1328                 if (c->array_size)
1329                         *c->array_size += expand;
1330 }
1331
1332 static void *message_extend_body(sd_bus_message *m, size_t align, size_t sz) {
1333         struct bus_body_part *part = NULL;
1334         size_t start_body, end_body, padding, start_part, end_part, added;
1335         bool add_new_part;
1336         void *p;
1337         int r;
1338
1339         assert(m);
1340         assert(align > 0);
1341         assert(!m->sealed);
1342
1343         if (m->poisoned)
1344                 return NULL;
1345
1346         start_body = ALIGN_TO((size_t) m->header->body_size, align);
1347         end_body = start_body + sz;
1348
1349         padding = start_body - m->header->body_size;
1350         added = padding + sz;
1351
1352         /* Check for 32bit overflows */
1353         if (end_body > (size_t) ((uint32_t) -1)) {
1354                 m->poisoned = true;
1355                 return NULL;
1356         }
1357
1358         add_new_part =
1359                 m->n_body_parts <= 0 ||
1360                 m->body_end->sealed ||
1361                 padding != ALIGN_TO(m->body_end->size, align) - m->body_end->size;
1362
1363         if (add_new_part) {
1364                 if (padding > 0) {
1365                         part = message_append_part(m);
1366                         if (!part)
1367                                 return NULL;
1368
1369                         part_zero(part, padding);
1370                 }
1371
1372                 part = message_append_part(m);
1373                 if (!part)
1374                         return NULL;
1375
1376                 r = part_make_space(m, part, sz, &p);
1377                 if (r < 0)
1378                         return NULL;
1379         } else {
1380                 struct bus_container *c;
1381                 void *op;
1382                 size_t os;
1383
1384                 part = m->body_end;
1385                 op = part->data;
1386                 os = part->size;
1387
1388                 start_part = ALIGN_TO(part->size, align);
1389                 end_part = start_part + sz;
1390
1391                 r = part_make_space(m, part, end_part, &p);
1392                 if (r < 0)
1393                         return NULL;
1394
1395                 if (padding > 0) {
1396                         memset(p, 0, padding);
1397                         p = (uint8_t*) p + padding;
1398                 }
1399
1400                 /* Readjust pointers */
1401                 for (c = m->containers; c < m->containers + m->n_containers; c++)
1402                         c->array_size = adjust_pointer(c->array_size, op, os, part->data);
1403
1404                 m->error.message = (const char*) adjust_pointer(m->error.message, op, os, part->data);
1405         }
1406
1407         m->header->body_size = end_body;
1408         message_extend_containers(m, added);
1409
1410         return p;
1411 }
1412
1413 int message_append_basic(sd_bus_message *m, char type, const void *p, const void **stored) {
1414         struct bus_container *c;
1415         ssize_t align, sz;
1416         uint32_t k;
1417         void *a;
1418         int fd = -1;
1419         uint32_t fdi = 0;
1420         int r;
1421
1422         if (!m)
1423                 return -EINVAL;
1424         if (!p)
1425                 return -EINVAL;
1426         if (m->sealed)
1427                 return -EPERM;
1428         if (!bus_type_is_basic(type))
1429                 return -EINVAL;
1430         if (m->poisoned)
1431                 return -ESTALE;
1432
1433         c = message_get_container(m);
1434
1435         if (c->signature && c->signature[c->index]) {
1436                 /* Container signature is already set */
1437
1438                 if (c->signature[c->index] != type)
1439                         return -ENXIO;
1440         } else {
1441                 char *e;
1442
1443                 /* Maybe we can append to the signature? But only if this is the top-level container*/
1444                 if (c->enclosing != 0)
1445                         return -ENXIO;
1446
1447                 e = strextend(&c->signature, CHAR_TO_STR(type), NULL);
1448                 if (!e) {
1449                         m->poisoned = true;
1450                         return -ENOMEM;
1451                 }
1452         }
1453
1454         switch (type) {
1455
1456         case SD_BUS_TYPE_STRING:
1457         case SD_BUS_TYPE_OBJECT_PATH:
1458
1459                 align = 4;
1460                 sz = 4 + strlen(p) + 1;
1461                 break;
1462
1463         case SD_BUS_TYPE_SIGNATURE:
1464
1465                 align = 1;
1466                 sz = 1 + strlen(p) + 1;
1467                 break;
1468
1469         case SD_BUS_TYPE_BOOLEAN:
1470                 align = sz = 4;
1471
1472                 assert_cc(sizeof(int) == sizeof(uint32_t));
1473                 memcpy(&k, p, 4);
1474                 k = !!k;
1475                 p = &k;
1476                 break;
1477
1478         case SD_BUS_TYPE_UNIX_FD: {
1479                 int z, *f;
1480
1481                 if (!m->allow_fds) {
1482                         r = -ENOTSUP;
1483                         goto fail;
1484                 }
1485
1486                 align = sz = 4;
1487
1488                 z = *(int*) p;
1489                 if (z < 0) {
1490                         r = -EINVAL;
1491                         goto fail;
1492                 }
1493
1494                 fd = fcntl(z, F_DUPFD_CLOEXEC, 3);
1495                 if (fd < 0) {
1496                         r = -errno;
1497                         goto fail;
1498                 }
1499
1500                 f = realloc(m->fds, sizeof(int) * (m->n_fds + 1));
1501                 if (!f) {
1502                         m->poisoned = true;
1503                         r = -ENOMEM;
1504                         goto fail;
1505                 }
1506
1507                 fdi = m->n_fds;
1508                 f[fdi] = fd;
1509                 m->fds = f;
1510                 m->free_fds = true;
1511                 break;
1512         }
1513
1514         default:
1515                 align = bus_type_get_alignment(type);
1516                 sz = bus_type_get_size(type);
1517                 break;
1518         }
1519
1520         assert(align > 0);
1521         assert(sz > 0);
1522
1523         a = message_extend_body(m, align, sz);
1524         if (!a) {
1525                 r = -ENOMEM;
1526                 goto fail;
1527         }
1528
1529         if (type == SD_BUS_TYPE_STRING || type == SD_BUS_TYPE_OBJECT_PATH) {
1530                 *(uint32_t*) a = sz - 5;
1531                 memcpy((uint8_t*) a + 4, p, sz - 4);
1532
1533                 if (stored)
1534                         *stored = (const uint8_t*) a + 4;
1535
1536         } else if (type == SD_BUS_TYPE_SIGNATURE) {
1537                 *(uint8_t*) a = sz - 1;
1538                 memcpy((uint8_t*) a + 1, p, sz - 1);
1539
1540                 if (stored)
1541                         *stored = (const uint8_t*) a + 1;
1542         } else if (type == SD_BUS_TYPE_UNIX_FD) {
1543                 *(uint32_t*) a = fdi;
1544
1545                 if (stored)
1546                         *stored = a;
1547
1548                 m->n_fds ++;
1549
1550         } else {
1551                 memcpy(a, p, sz);
1552
1553                 if (stored)
1554                         *stored = a;
1555         }
1556
1557         if (c->enclosing != SD_BUS_TYPE_ARRAY)
1558                 c->index++;
1559
1560         return 0;
1561
1562 fail:
1563         if (fd >= 0)
1564                 close_nointr_nofail(fd);
1565
1566         return r;
1567 }
1568
1569 int sd_bus_message_append_basic(sd_bus_message *m, char type, const void *p) {
1570         return message_append_basic(m, type, p, NULL);
1571 }
1572
1573 int sd_bus_message_append_string_space(sd_bus_message *m, size_t size, char **s) {
1574         struct bus_container *c;
1575         void *a;
1576
1577         if (!m)
1578                 return -EINVAL;
1579         if (!s)
1580                 return -EINVAL;
1581         if (m->sealed)
1582                 return -EPERM;
1583         if (m->poisoned)
1584                 return -ESTALE;
1585
1586         c = message_get_container(m);
1587
1588         if (c->signature && c->signature[c->index]) {
1589                 /* Container signature is already set */
1590
1591                 if (c->signature[c->index] != SD_BUS_TYPE_STRING)
1592                         return -ENXIO;
1593         } else {
1594                 char *e;
1595
1596                 /* Maybe we can append to the signature? But only if this is the top-level container*/
1597                 if (c->enclosing != 0)
1598                         return -ENXIO;
1599
1600                 e = strextend(&c->signature, CHAR_TO_STR(SD_BUS_TYPE_STRING), NULL);
1601                 if (!e) {
1602                         m->poisoned = true;
1603                         return -ENOMEM;
1604                 }
1605         }
1606
1607         a = message_extend_body(m, 4, 4 + size + 1);
1608         if (!a)
1609                 return -ENOMEM;
1610
1611         *(uint32_t*) a = size;
1612         *s = (char*) a + 4;
1613
1614         (*s)[size] = 0;
1615
1616         if (c->enclosing != SD_BUS_TYPE_ARRAY)
1617                 c->index++;
1618
1619         return 0;
1620 }
1621
1622 static int bus_message_open_array(
1623                 sd_bus_message *m,
1624                 struct bus_container *c,
1625                 const char *contents,
1626                 uint32_t **array_size) {
1627
1628         unsigned nindex;
1629         void *a, *op;
1630         int alignment;
1631         size_t os;
1632         struct bus_body_part *o;
1633
1634         assert(m);
1635         assert(c);
1636         assert(contents);
1637         assert(array_size);
1638
1639         if (!signature_is_single(contents, true))
1640                 return -EINVAL;
1641
1642         alignment = bus_type_get_alignment(contents[0]);
1643         if (alignment < 0)
1644                 return alignment;
1645
1646         if (c->signature && c->signature[c->index]) {
1647
1648                 /* Verify the existing signature */
1649
1650                 if (c->signature[c->index] != SD_BUS_TYPE_ARRAY)
1651                         return -ENXIO;
1652
1653                 if (!startswith(c->signature + c->index + 1, contents))
1654                         return -ENXIO;
1655
1656                 nindex = c->index + 1 + strlen(contents);
1657         } else {
1658                 char *e;
1659
1660                 if (c->enclosing != 0)
1661                         return -ENXIO;
1662
1663                 /* Extend the existing signature */
1664
1665                 e = strextend(&c->signature, CHAR_TO_STR(SD_BUS_TYPE_ARRAY), contents, NULL);
1666                 if (!e) {
1667                         m->poisoned = true;
1668                         return -ENOMEM;
1669                 }
1670
1671                 nindex = e - c->signature;
1672         }
1673
1674         a = message_extend_body(m, 4, 4);
1675         if (!a)
1676                 return -ENOMEM;
1677
1678         o = m->body_end;
1679         op = m->body_end->data;
1680         os = m->body_end->size;
1681
1682         /* Add alignment between size and first element */
1683         if (!message_extend_body(m, alignment, 0))
1684                 return -ENOMEM;
1685
1686         if (c->enclosing != SD_BUS_TYPE_ARRAY)
1687                 c->index = nindex;
1688
1689         /* location of array size might have changed so let's readjust a */
1690         if (o == m->body_end)
1691                 a = adjust_pointer(a, op, os, m->body_end->data);
1692
1693         *(uint32_t*) a = 0;
1694         *array_size = a;
1695         return 0;
1696 }
1697
1698 static int bus_message_open_variant(
1699                 sd_bus_message *m,
1700                 struct bus_container *c,
1701                 const char *contents) {
1702
1703         size_t l;
1704         void *a;
1705
1706         assert(m);
1707         assert(c);
1708         assert(contents);
1709
1710         if (!signature_is_single(contents, false))
1711                 return -EINVAL;
1712
1713         if (*contents == SD_BUS_TYPE_DICT_ENTRY_BEGIN)
1714                 return -EINVAL;
1715
1716         if (c->signature && c->signature[c->index]) {
1717
1718                 if (c->signature[c->index] != SD_BUS_TYPE_VARIANT)
1719                         return -ENXIO;
1720
1721         } else {
1722                 char *e;
1723
1724                 if (c->enclosing != 0)
1725                         return -ENXIO;
1726
1727                 e = strextend(&c->signature, CHAR_TO_STR(SD_BUS_TYPE_VARIANT), NULL);
1728                 if (!e) {
1729                         m->poisoned = true;
1730                         return -ENOMEM;
1731                 }
1732         }
1733
1734         l = strlen(contents);
1735         a = message_extend_body(m, 1, 1 + l + 1);
1736         if (!a)
1737                 return -ENOMEM;
1738
1739         *(uint8_t*) a = l;
1740         memcpy((uint8_t*) a + 1, contents, l + 1);
1741
1742         if (c->enclosing != SD_BUS_TYPE_ARRAY)
1743                 c->index++;
1744
1745         return 0;
1746 }
1747
1748 static int bus_message_open_struct(
1749                 sd_bus_message *m,
1750                 struct bus_container *c,
1751                 const char *contents) {
1752
1753         size_t nindex;
1754
1755         assert(m);
1756         assert(c);
1757         assert(contents);
1758
1759         if (!signature_is_valid(contents, false))
1760                 return -EINVAL;
1761
1762         if (c->signature && c->signature[c->index]) {
1763                 size_t l;
1764
1765                 l = strlen(contents);
1766
1767                 if (c->signature[c->index] != SD_BUS_TYPE_STRUCT_BEGIN ||
1768                     !startswith(c->signature + c->index + 1, contents) ||
1769                     c->signature[c->index + 1 + l] != SD_BUS_TYPE_STRUCT_END)
1770                         return -ENXIO;
1771
1772                 nindex = c->index + 1 + l + 1;
1773         } else {
1774                 char *e;
1775
1776                 if (c->enclosing != 0)
1777                         return -ENXIO;
1778
1779                 e = strextend(&c->signature, CHAR_TO_STR(SD_BUS_TYPE_STRUCT_BEGIN), contents, CHAR_TO_STR(SD_BUS_TYPE_STRUCT_END), NULL);
1780                 if (!e) {
1781                         m->poisoned = true;
1782                         return -ENOMEM;
1783                 }
1784
1785                 nindex = e - c->signature;
1786         }
1787
1788         /* Align contents to 8 byte boundary */
1789         if (!message_extend_body(m, 8, 0))
1790                 return -ENOMEM;
1791
1792         if (c->enclosing != SD_BUS_TYPE_ARRAY)
1793                 c->index = nindex;
1794
1795         return 0;
1796 }
1797
1798 static int bus_message_open_dict_entry(
1799                 sd_bus_message *m,
1800                 struct bus_container *c,
1801                 const char *contents) {
1802
1803         size_t nindex;
1804
1805         assert(m);
1806         assert(c);
1807         assert(contents);
1808
1809         if (!signature_is_pair(contents))
1810                 return -EINVAL;
1811
1812         if (c->enclosing != SD_BUS_TYPE_ARRAY)
1813                 return -ENXIO;
1814
1815         if (c->signature && c->signature[c->index]) {
1816                 size_t l;
1817
1818                 l = strlen(contents);
1819
1820                 if (c->signature[c->index] != SD_BUS_TYPE_DICT_ENTRY_BEGIN ||
1821                     !startswith(c->signature + c->index + 1, contents) ||
1822                     c->signature[c->index + 1 + l] != SD_BUS_TYPE_DICT_ENTRY_END)
1823                         return -ENXIO;
1824
1825                 nindex = c->index + 1 + l + 1;
1826         } else
1827                 return -ENXIO;
1828
1829         /* Align contents to 8 byte boundary */
1830         if (!message_extend_body(m, 8, 0))
1831                 return -ENOMEM;
1832
1833         if (c->enclosing != SD_BUS_TYPE_ARRAY)
1834                 c->index = nindex;
1835
1836         return 0;
1837 }
1838
1839 int sd_bus_message_open_container(
1840                 sd_bus_message *m,
1841                 char type,
1842                 const char *contents) {
1843
1844         struct bus_container *c, *w;
1845         uint32_t *array_size = NULL;
1846         char *signature;
1847         size_t before;
1848         int r;
1849
1850         if (!m)
1851                 return -EINVAL;
1852         if (m->sealed)
1853                 return -EPERM;
1854         if (!contents)
1855                 return -EINVAL;
1856         if (m->poisoned)
1857                 return -ESTALE;
1858
1859         /* Make sure we have space for one more container */
1860         w = realloc(m->containers, sizeof(struct bus_container) * (m->n_containers + 1));
1861         if (!w) {
1862                 m->poisoned = true;
1863                 return -ENOMEM;
1864         }
1865
1866         m->containers = w;
1867
1868         c = message_get_container(m);
1869
1870         signature = strdup(contents);
1871         if (!signature) {
1872                 m->poisoned = true;
1873                 return -ENOMEM;
1874         }
1875
1876         /* Save old index in the parent container, in case we have to
1877          * abort this container */
1878         c->saved_index = c->index;
1879         before = m->header->body_size;
1880
1881         if (type == SD_BUS_TYPE_ARRAY)
1882                 r = bus_message_open_array(m, c, contents, &array_size);
1883         else if (type == SD_BUS_TYPE_VARIANT)
1884                 r = bus_message_open_variant(m, c, contents);
1885         else if (type == SD_BUS_TYPE_STRUCT)
1886                 r = bus_message_open_struct(m, c, contents);
1887         else if (type == SD_BUS_TYPE_DICT_ENTRY)
1888                 r = bus_message_open_dict_entry(m, c, contents);
1889         else
1890                 r = -EINVAL;
1891
1892         if (r < 0) {
1893                 free(signature);
1894                 return r;
1895         }
1896
1897         /* OK, let's fill it in */
1898         w += m->n_containers++;
1899         w->enclosing = type;
1900         w->signature = signature;
1901         w->index = 0;
1902         w->array_size = array_size;
1903         w->before = before;
1904         w->begin = m->rindex;
1905
1906         return 0;
1907 }
1908
1909 int sd_bus_message_close_container(sd_bus_message *m) {
1910         struct bus_container *c;
1911
1912         if (!m)
1913                 return -EINVAL;
1914         if (m->sealed)
1915                 return -EPERM;
1916         if (m->n_containers <= 0)
1917                 return -EINVAL;
1918         if (m->poisoned)
1919                 return -ESTALE;
1920
1921         c = message_get_container(m);
1922         if (c->enclosing != SD_BUS_TYPE_ARRAY)
1923                 if (c->signature && c->signature[c->index] != 0)
1924                         return -EINVAL;
1925
1926         free(c->signature);
1927         m->n_containers--;
1928
1929         return 0;
1930 }
1931
1932 typedef struct {
1933         const char *types;
1934         unsigned n_struct;
1935         unsigned n_array;
1936 } TypeStack;
1937
1938 static int type_stack_push(TypeStack *stack, unsigned max, unsigned *i, const char *types, unsigned n_struct, unsigned n_array) {
1939         assert(stack);
1940         assert(max > 0);
1941
1942         if (*i >= max)
1943                 return -EINVAL;
1944
1945         stack[*i].types = types;
1946         stack[*i].n_struct = n_struct;
1947         stack[*i].n_array = n_array;
1948         (*i)++;
1949
1950         return 0;
1951 }
1952
1953 static int type_stack_pop(TypeStack *stack, unsigned max, unsigned *i, const char **types, unsigned *n_struct, unsigned *n_array) {
1954         assert(stack);
1955         assert(max > 0);
1956         assert(types);
1957         assert(n_struct);
1958         assert(n_array);
1959
1960         if (*i <= 0)
1961                 return 0;
1962
1963         (*i)--;
1964         *types = stack[*i].types;
1965         *n_struct = stack[*i].n_struct;
1966         *n_array = stack[*i].n_array;
1967
1968         return 1;
1969 }
1970
1971 int bus_message_append_ap(
1972                 sd_bus_message *m,
1973                 const char *types,
1974                 va_list ap) {
1975
1976         unsigned n_array, n_struct;
1977         TypeStack stack[BUS_CONTAINER_DEPTH];
1978         unsigned stack_ptr = 0;
1979         int r;
1980
1981         assert(m);
1982
1983         if (!types)
1984                 return 0;
1985
1986         n_array = (unsigned) -1;
1987         n_struct = strlen(types);
1988
1989         for (;;) {
1990                 const char *t;
1991
1992                 if (n_array == 0 || (n_array == (unsigned) -1 && n_struct == 0)) {
1993                         r = type_stack_pop(stack, ELEMENTSOF(stack), &stack_ptr, &types, &n_struct, &n_array);
1994                         if (r < 0)
1995                                 return r;
1996                         if (r == 0)
1997                                 break;
1998
1999                         r = sd_bus_message_close_container(m);
2000                         if (r < 0)
2001                                 return r;
2002
2003                         continue;
2004                 }
2005
2006                 t = types;
2007                 if (n_array != (unsigned) -1)
2008                         n_array --;
2009                 else {
2010                         types ++;
2011                         n_struct--;
2012                 }
2013
2014                 switch (*t) {
2015
2016                 case SD_BUS_TYPE_BYTE: {
2017                         uint8_t x;
2018
2019                         x = (uint8_t) va_arg(ap, int);
2020                         r = sd_bus_message_append_basic(m, *t, &x);
2021                         break;
2022                 }
2023
2024                 case SD_BUS_TYPE_BOOLEAN:
2025                 case SD_BUS_TYPE_INT32:
2026                 case SD_BUS_TYPE_UINT32:
2027                 case SD_BUS_TYPE_UNIX_FD: {
2028                         uint32_t x;
2029
2030                         /* We assume a boolean is the same as int32_t */
2031                         assert_cc(sizeof(int32_t) == sizeof(int));
2032
2033                         x = va_arg(ap, uint32_t);
2034                         r = sd_bus_message_append_basic(m, *t, &x);
2035                         break;
2036                 }
2037
2038                 case SD_BUS_TYPE_INT16:
2039                 case SD_BUS_TYPE_UINT16: {
2040                         uint16_t x;
2041
2042                         x = (uint16_t) va_arg(ap, int);
2043                         r = sd_bus_message_append_basic(m, *t, &x);
2044                         break;
2045                 }
2046
2047                 case SD_BUS_TYPE_INT64:
2048                 case SD_BUS_TYPE_UINT64:
2049                 case SD_BUS_TYPE_DOUBLE: {
2050                         uint64_t x;
2051
2052                         x = va_arg(ap, uint64_t);
2053                         r = sd_bus_message_append_basic(m, *t, &x);
2054                         break;
2055                 }
2056
2057                 case SD_BUS_TYPE_STRING:
2058                 case SD_BUS_TYPE_OBJECT_PATH:
2059                 case SD_BUS_TYPE_SIGNATURE: {
2060                         const char *x;
2061
2062                         x = va_arg(ap, const char*);
2063                         r = sd_bus_message_append_basic(m, *t, x);
2064                         break;
2065                 }
2066
2067                 case SD_BUS_TYPE_ARRAY: {
2068                         size_t k;
2069
2070                         r = signature_element_length(t + 1, &k);
2071                         if (r < 0)
2072                                 return r;
2073
2074                         {
2075                                 char s[k + 1];
2076                                 memcpy(s, t + 1, k);
2077                                 s[k] = 0;
2078
2079                                 r = sd_bus_message_open_container(m, SD_BUS_TYPE_ARRAY, s);
2080                                 if (r < 0)
2081                                         return r;
2082                         }
2083
2084                         if (n_array == (unsigned) -1) {
2085                                 types += k;
2086                                 n_struct -= k;
2087                         }
2088
2089                         r = type_stack_push(stack, ELEMENTSOF(stack), &stack_ptr, types, n_struct, n_array);
2090                         if (r < 0)
2091                                 return r;
2092
2093                         types = t + 1;
2094                         n_struct = k;
2095                         n_array = va_arg(ap, unsigned);
2096
2097                         break;
2098                 }
2099
2100                 case SD_BUS_TYPE_VARIANT: {
2101                         const char *s;
2102
2103                         s = va_arg(ap, const char*);
2104                         if (!s)
2105                                 return -EINVAL;
2106
2107                         r = sd_bus_message_open_container(m, SD_BUS_TYPE_VARIANT, s);
2108                         if (r < 0)
2109                                 return r;
2110
2111                         r = type_stack_push(stack, ELEMENTSOF(stack), &stack_ptr, types, n_struct, n_array);
2112                         if (r < 0)
2113                                 return r;
2114
2115                         types = s;
2116                         n_struct = strlen(s);
2117                         n_array = (unsigned) -1;
2118
2119                         break;
2120                 }
2121
2122                 case SD_BUS_TYPE_STRUCT_BEGIN:
2123                 case SD_BUS_TYPE_DICT_ENTRY_BEGIN: {
2124                         size_t k;
2125
2126                         r = signature_element_length(t, &k);
2127                         if (r < 0)
2128                                 return r;
2129
2130                         {
2131                                 char s[k - 1];
2132
2133                                 memcpy(s, t + 1, k - 2);
2134                                 s[k - 2] = 0;
2135
2136                                 r = sd_bus_message_open_container(m, *t == SD_BUS_TYPE_STRUCT_BEGIN ? SD_BUS_TYPE_STRUCT : SD_BUS_TYPE_DICT_ENTRY, s);
2137                                 if (r < 0)
2138                                         return r;
2139                         }
2140
2141                         if (n_array == (unsigned) -1) {
2142                                 types += k - 1;
2143                                 n_struct -= k - 1;
2144                         }
2145
2146                         r = type_stack_push(stack, ELEMENTSOF(stack), &stack_ptr, types, n_struct, n_array);
2147                         if (r < 0)
2148                                 return r;
2149
2150                         types = t + 1;
2151                         n_struct = k - 2;
2152                         n_array = (unsigned) -1;
2153
2154                         break;
2155                 }
2156
2157                 default:
2158                         r = -EINVAL;
2159                 }
2160
2161                 if (r < 0)
2162                         return r;
2163         }
2164
2165         return 0;
2166 }
2167
2168 int sd_bus_message_append(sd_bus_message *m, const char *types, ...) {
2169         va_list ap;
2170         int r;
2171
2172         if (!m)
2173                 return -EINVAL;
2174         if (m->sealed)
2175                 return -EPERM;
2176         if (m->poisoned)
2177                 return -ESTALE;
2178         if (!types)
2179                 return 0;
2180
2181         va_start(ap, types);
2182         r = bus_message_append_ap(m, types, ap);
2183         va_end(ap);
2184
2185         return r;
2186 }
2187
2188 int sd_bus_message_append_array_space(sd_bus_message *m, char type, size_t size, void **ptr) {
2189         ssize_t align, sz;
2190         void *a;
2191         int r;
2192
2193         if (!m)
2194                 return -EINVAL;
2195         if (m->sealed)
2196                 return -EPERM;
2197         if (!bus_type_is_trivial(type))
2198                 return -EINVAL;
2199         if (!ptr && size > 0)
2200                 return -EINVAL;
2201         if (m->poisoned)
2202                 return -ESTALE;
2203
2204         align = bus_type_get_alignment(type);
2205         sz = bus_type_get_size(type);
2206
2207         assert_se(align > 0);
2208         assert_se(sz > 0);
2209
2210         if (size % sz != 0)
2211                 return -EINVAL;
2212
2213         r = sd_bus_message_open_container(m, SD_BUS_TYPE_ARRAY, CHAR_TO_STR(type));
2214         if (r < 0)
2215                 return r;
2216
2217         a = message_extend_body(m, align, size);
2218         if (!a)
2219                 return -ENOMEM;
2220
2221         r = sd_bus_message_close_container(m);
2222         if (r < 0)
2223                 return r;
2224
2225         *ptr = a;
2226         return 0;
2227 }
2228
2229 int sd_bus_message_append_array(sd_bus_message *m, char type, const void *ptr, size_t size) {
2230         int r;
2231         void *p;
2232
2233         if (!ptr && size > 0)
2234                 return -EINVAL;
2235
2236         r = sd_bus_message_append_array_space(m, type, size, &p);
2237         if (r < 0)
2238                 return r;
2239
2240         if (size > 0)
2241                 memcpy(p, ptr, size);
2242
2243         return 0;
2244 }
2245
2246 int sd_bus_message_append_array_memfd(sd_bus_message *m, char type, sd_memfd *memfd) {
2247         _cleanup_close_ int copy_fd = -1;
2248         struct bus_body_part *part;
2249         ssize_t align, sz;
2250         uint64_t size;
2251         void *a;
2252         int r;
2253
2254         if (!m)
2255                 return -EINVAL;
2256         if (!memfd)
2257                 return -EINVAL;
2258         if (m->sealed)
2259                 return -EPERM;
2260         if (!bus_type_is_trivial(type))
2261                 return -EINVAL;
2262         if (m->poisoned)
2263                 return -ESTALE;
2264
2265         r = sd_memfd_set_sealed(memfd, true);
2266         if (r < 0)
2267                 return r;
2268
2269         copy_fd = sd_memfd_dup_fd(memfd);
2270         if (copy_fd < 0)
2271                 return copy_fd;
2272
2273         r = sd_memfd_get_size(memfd, &size);
2274         if (r < 0)
2275                 return r;
2276
2277         align = bus_type_get_alignment(type);
2278         sz = bus_type_get_size(type);
2279
2280         assert_se(align > 0);
2281         assert_se(sz > 0);
2282
2283         if (size % sz != 0)
2284                 return -EINVAL;
2285
2286         if (size > (uint64_t) (uint32_t) -1)
2287                 return -EINVAL;
2288
2289         r = sd_bus_message_open_container(m, SD_BUS_TYPE_ARRAY, CHAR_TO_STR(type));
2290         if (r < 0)
2291                 return r;
2292
2293         a = message_extend_body(m, align, 0);
2294         if (!a)
2295                 return -ENOMEM;
2296
2297         part = message_append_part(m);
2298         if (!part)
2299                 return -ENOMEM;
2300
2301         part->memfd = copy_fd;
2302         part->sealed = true;
2303         part->size = size;
2304         copy_fd = -1;
2305
2306         message_extend_containers(m, size);
2307         m->header->body_size += size;
2308
2309         return sd_bus_message_close_container(m);
2310 }
2311
2312 int sd_bus_message_append_string_memfd(sd_bus_message *m, sd_memfd *memfd) {
2313         _cleanup_close_ int copy_fd = -1;
2314         struct bus_body_part *part;
2315         struct bus_container *c;
2316         uint64_t size;
2317         void *a;
2318         int r;
2319
2320         assert_return(m, -EINVAL);
2321         assert_return(memfd, -EINVAL);
2322         assert_return(!m->sealed, -EPERM);
2323         assert_return(!m->poisoned, -ESTALE);
2324
2325         r = sd_memfd_set_sealed(memfd, true);
2326         if (r < 0)
2327                 return r;
2328
2329         copy_fd = sd_memfd_dup_fd(memfd);
2330         if (copy_fd < 0)
2331                 return copy_fd;
2332
2333         r = sd_memfd_get_size(memfd, &size);
2334         if (r < 0)
2335                 return r;
2336
2337         /* We require this to be NUL terminated */
2338         if (size == 0)
2339                 return -EINVAL;
2340
2341         if (size > (uint64_t) (uint32_t) -1)
2342                 return -EINVAL;
2343
2344         c = message_get_container(m);
2345         if (c->signature && c->signature[c->index]) {
2346                 /* Container signature is already set */
2347
2348                 if (c->signature[c->index] != SD_BUS_TYPE_STRING)
2349                         return -ENXIO;
2350         } else {
2351                 char *e;
2352
2353                 /* Maybe we can append to the signature? But only if this is the top-level container*/
2354                 if (c->enclosing != 0)
2355                         return -ENXIO;
2356
2357                 e = strextend(&c->signature, CHAR_TO_STR(SD_BUS_TYPE_STRING), NULL);
2358                 if (!e) {
2359                         m->poisoned = true;
2360                         return -ENOMEM;
2361                 }
2362         }
2363
2364         a = message_extend_body(m, 4, 4);
2365         if (!a)
2366                 return -ENOMEM;
2367
2368         *(uint32_t*) a = size - 1;
2369
2370         part = message_append_part(m);
2371         if (!part)
2372                 return -ENOMEM;
2373
2374         part->memfd = copy_fd;
2375         part->sealed = true;
2376         part->size = size;
2377         copy_fd = -1;
2378
2379         message_extend_containers(m, size);
2380         m->header->body_size += size;
2381
2382         if (c->enclosing != SD_BUS_TYPE_ARRAY)
2383                 c->index++;
2384
2385         return 0;
2386 }
2387
2388 int sd_bus_message_append_strv(sd_bus_message *m, char **l) {
2389         char **i;
2390         int r;
2391
2392         assert_return(m, -EINVAL);
2393         assert_return(!m->sealed, -EPERM);
2394         assert_return(!m->poisoned, -ESTALE);
2395
2396         r = sd_bus_message_open_container(m, 'a', "s");
2397         if (r < 0)
2398                 return r;
2399
2400         STRV_FOREACH(i, l) {
2401                 r = sd_bus_message_append_basic(m, 's', *i);
2402                 if (r < 0)
2403                         return r;
2404         }
2405
2406         return sd_bus_message_close_container(m);
2407 }
2408
2409 int bus_body_part_map(struct bus_body_part *part) {
2410         void *p;
2411         size_t psz;
2412
2413         assert_se(part);
2414
2415         if (part->data)
2416                 return 0;
2417
2418         if (part->size <= 0)
2419                 return 0;
2420
2421         /* For smaller zero parts (as used for padding) we don't need to map anything... */
2422         if (part->memfd < 0 && part->is_zero && part->size < 8) {
2423                 static const uint8_t zeroes[7] = { };
2424                 part->data = (void*) zeroes;
2425                 return 0;
2426         }
2427
2428         psz = PAGE_ALIGN(part->size);
2429
2430         if (part->memfd >= 0)
2431                 p = mmap(NULL, psz, PROT_READ, MAP_SHARED, part->memfd, 0);
2432         else if (part->is_zero)
2433                 p = mmap(NULL, psz, PROT_READ, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
2434         else
2435                 return -EINVAL;
2436
2437         if (p == MAP_FAILED)
2438                 return -errno;
2439
2440         part->mapped = psz;
2441         part->data = p;
2442         part->munmap_this = true;
2443
2444         return 0;
2445 }
2446
2447 void bus_body_part_unmap(struct bus_body_part *part) {
2448
2449         assert_se(part);
2450
2451         if (part->memfd < 0)
2452                 return;
2453
2454         if (!part->data)
2455                 return;
2456
2457         if (!part->munmap_this)
2458                 return;
2459
2460         assert_se(munmap(part->data, part->mapped) == 0);
2461
2462         part->data = NULL;
2463         part->mapped = 0;
2464         part->munmap_this = false;
2465
2466         return;
2467 }
2468
2469 static int buffer_peek(const void *p, uint32_t sz, size_t *rindex, size_t align, size_t nbytes, void **r) {
2470         size_t k, start, end;
2471
2472         assert(rindex);
2473         assert(align > 0);
2474
2475         start = ALIGN_TO((size_t) *rindex, align);
2476         end = start + nbytes;
2477
2478         if (end > sz)
2479                 return -EBADMSG;
2480
2481         /* Verify that padding is 0 */
2482         for (k = *rindex; k < start; k++)
2483                 if (((const uint8_t*) p)[k] != 0)
2484                         return -EBADMSG;
2485
2486         if (r)
2487                 *r = (uint8_t*) p + start;
2488
2489         *rindex = end;
2490
2491         return 1;
2492 }
2493
2494 static bool message_end_of_array(sd_bus_message *m, size_t index) {
2495         struct bus_container *c;
2496
2497         assert(m);
2498
2499         c = message_get_container(m);
2500         if (!c->array_size)
2501                 return false;
2502
2503         return index >= c->begin + BUS_MESSAGE_BSWAP32(m, *c->array_size);
2504 }
2505
2506 static struct bus_body_part* find_part(sd_bus_message *m, size_t index, size_t sz, void **p) {
2507         struct bus_body_part *part;
2508         size_t begin;
2509         int r;
2510
2511         assert(m);
2512
2513         if (m->cached_rindex_part && index >= m->cached_rindex_part_begin) {
2514                 part = m->cached_rindex_part;
2515                 begin = m->cached_rindex_part_begin;
2516         } else {
2517                 part = &m->body;
2518                 begin = 0;
2519         }
2520
2521         while (part) {
2522                 if (index < begin)
2523                         return NULL;
2524
2525                 if (index + sz <= begin + part->size) {
2526
2527                         r = bus_body_part_map(part);
2528                         if (r < 0)
2529                                 return NULL;
2530
2531                         if (p)
2532                                 *p = (uint8_t*) part->data + index - begin;
2533
2534                         m->cached_rindex_part = part;
2535                         m->cached_rindex_part_begin = begin;
2536
2537                         return part;
2538                 }
2539
2540                 begin += part->size;
2541                 part = part->next;
2542         }
2543
2544         return NULL;
2545 }
2546
2547 static int message_peek_body(
2548                 sd_bus_message *m,
2549                 size_t *rindex,
2550                 size_t align,
2551                 size_t nbytes,
2552                 void **ret) {
2553
2554         size_t k, start, end, padding;
2555         struct bus_body_part *part;
2556         uint8_t *q;
2557
2558         assert(m);
2559         assert(rindex);
2560         assert(align > 0);
2561
2562         if (message_end_of_array(m, *rindex))
2563                 return 0;
2564
2565         start = ALIGN_TO((size_t) *rindex, align);
2566         padding = start - *rindex;
2567         end = start + nbytes;
2568
2569         if (end > BUS_MESSAGE_BODY_SIZE(m))
2570                 return -EBADMSG;
2571
2572         part = find_part(m, *rindex, padding, (void**) &q);
2573         if (!part)
2574                 return -EBADMSG;
2575
2576         if (q) {
2577                 /* Verify padding */
2578                 for (k = 0; k < padding; k++)
2579                         if (q[k] != 0)
2580                                 return -EBADMSG;
2581         }
2582
2583         part = find_part(m, start, nbytes, (void**) &q);
2584         if (!part || !q)
2585                 return -EBADMSG;
2586
2587         *rindex = end;
2588
2589         if (ret)
2590                 *ret = q;
2591
2592         return 1;
2593 }
2594
2595 static bool validate_nul(const char *s, size_t l) {
2596
2597         /* Check for NUL chars in the string */
2598         if (memchr(s, 0, l))
2599                 return false;
2600
2601         /* Check for NUL termination */
2602         if (s[l] != 0)
2603                 return false;
2604
2605         return true;
2606 }
2607
2608 static bool validate_string(const char *s, size_t l) {
2609
2610         if (!validate_nul(s, l))
2611                 return false;
2612
2613         /* Check if valid UTF8 */
2614         if (!utf8_is_valid(s))
2615                 return false;
2616
2617         return true;
2618 }
2619
2620 static bool validate_signature(const char *s, size_t l) {
2621
2622         if (!validate_nul(s, l))
2623                 return false;
2624
2625         /* Check if valid signature */
2626         if (!signature_is_valid(s, true))
2627                 return false;
2628
2629         return true;
2630 }
2631
2632 static bool validate_object_path(const char *s, size_t l) {
2633
2634         if (!validate_nul(s, l))
2635                 return false;
2636
2637         if (!object_path_is_valid(s))
2638                 return false;
2639
2640         return true;
2641 }
2642
2643 int sd_bus_message_read_basic(sd_bus_message *m, char type, void *p) {
2644         struct bus_container *c;
2645         int r;
2646         void *q;
2647
2648         if (!m)
2649                 return -EINVAL;
2650         if (!m->sealed)
2651                 return -EPERM;
2652         if (!bus_type_is_basic(type))
2653                 return -EINVAL;
2654         if (!p)
2655                 return -EINVAL;
2656
2657         c = message_get_container(m);
2658
2659         if (!c->signature || c->signature[c->index] == 0)
2660                 return 0;
2661
2662         if (c->signature[c->index] != type)
2663                 return -ENXIO;
2664
2665         switch (type) {
2666
2667         case SD_BUS_TYPE_STRING:
2668         case SD_BUS_TYPE_OBJECT_PATH: {
2669                 uint32_t l;
2670                 size_t rindex;
2671
2672                 rindex = m->rindex;
2673                 r = message_peek_body(m, &rindex, 4, 4, &q);
2674                 if (r <= 0)
2675                         return r;
2676
2677                 l = BUS_MESSAGE_BSWAP32(m, *(uint32_t*) q);
2678                 r = message_peek_body(m, &rindex, 1, l+1, &q);
2679                 if (r < 0)
2680                         return r;
2681                 if (r == 0)
2682                         return -EBADMSG;
2683
2684                 if (type == SD_BUS_TYPE_OBJECT_PATH) {
2685                         if (!validate_object_path(q, l))
2686                                 return -EBADMSG;
2687                 } else {
2688                         if (!validate_string(q, l))
2689                                 return -EBADMSG;
2690                 }
2691
2692                 m->rindex = rindex;
2693                 *(const char**) p = q;
2694                 break;
2695         }
2696
2697         case SD_BUS_TYPE_SIGNATURE: {
2698                 uint8_t l;
2699                 size_t rindex;
2700
2701                 rindex = m->rindex;
2702                 r = message_peek_body(m, &rindex, 1, 1, &q);
2703                 if (r <= 0)
2704                         return r;
2705
2706                 l = *(uint8_t*) q;
2707                 r = message_peek_body(m, &rindex, 1, l+1, &q);
2708                 if (r < 0)
2709                         return r;
2710                 if (r == 0)
2711                         return -EBADMSG;
2712
2713                 if (!validate_signature(q, l))
2714                         return -EBADMSG;
2715
2716                 m->rindex = rindex;
2717                 *(const char**) p = q;
2718                 break;
2719         }
2720
2721         default: {
2722                 ssize_t sz, align;
2723                 size_t rindex;
2724
2725                 align = bus_type_get_alignment(type);
2726                 sz = bus_type_get_size(type);
2727                 assert(align > 0 && sz > 0);
2728
2729                 rindex = m->rindex;
2730                 r = message_peek_body(m, &rindex, align, sz, &q);
2731                 if (r <= 0)
2732                         return r;
2733
2734                 switch (type) {
2735
2736                 case SD_BUS_TYPE_BYTE:
2737                         *(uint8_t*) p = *(uint8_t*) q;
2738                         break;
2739
2740                 case SD_BUS_TYPE_BOOLEAN:
2741                         *(int*) p = !!*(uint32_t*) q;
2742                         break;
2743
2744                 case SD_BUS_TYPE_INT16:
2745                 case SD_BUS_TYPE_UINT16:
2746                         *(uint16_t*) p = BUS_MESSAGE_BSWAP16(m, *(uint16_t*) q);
2747                         break;
2748
2749                 case SD_BUS_TYPE_INT32:
2750                 case SD_BUS_TYPE_UINT32:
2751                         *(uint32_t*) p = BUS_MESSAGE_BSWAP32(m, *(uint32_t*) q);
2752                         break;
2753
2754                 case SD_BUS_TYPE_INT64:
2755                 case SD_BUS_TYPE_UINT64:
2756                 case SD_BUS_TYPE_DOUBLE:
2757                         *(uint64_t*) p = BUS_MESSAGE_BSWAP64(m, *(uint64_t*) q);
2758                         break;
2759
2760                 case SD_BUS_TYPE_UNIX_FD: {
2761                         uint32_t j;
2762
2763                         j = BUS_MESSAGE_BSWAP32(m, *(uint32_t*) q);
2764                         if (j >= m->n_fds)
2765                                 return -EBADMSG;
2766
2767                         *(int*) p = m->fds[j];
2768                         break;
2769                 }
2770
2771                 default:
2772                         assert_not_reached("Unknown basic type...");
2773                 }
2774
2775                 m->rindex = rindex;
2776
2777                 break;
2778         }
2779         }
2780
2781         if (c->enclosing != SD_BUS_TYPE_ARRAY)
2782                 c->index++;
2783
2784         return 1;
2785 }
2786
2787 static int bus_message_enter_array(
2788                 sd_bus_message *m,
2789                 struct bus_container *c,
2790                 const char *contents,
2791                 uint32_t **array_size) {
2792
2793         size_t rindex;
2794         void *q;
2795         int r, alignment;
2796
2797         assert(m);
2798         assert(c);
2799         assert(contents);
2800         assert(array_size);
2801
2802         if (!signature_is_single(contents, true))
2803                 return -EINVAL;
2804
2805         alignment = bus_type_get_alignment(contents[0]);
2806         if (alignment < 0)
2807                 return alignment;
2808
2809         if (!c->signature || c->signature[c->index] == 0)
2810                 return 0;
2811
2812         if (c->signature[c->index] != SD_BUS_TYPE_ARRAY)
2813                 return -ENXIO;
2814
2815         if (!startswith(c->signature + c->index + 1, contents))
2816                 return -ENXIO;
2817
2818         rindex = m->rindex;
2819         r = message_peek_body(m, &rindex, 4, 4, &q);
2820         if (r <= 0)
2821                 return r;
2822
2823         if (BUS_MESSAGE_BSWAP32(m, *(uint32_t*) q) > BUS_ARRAY_MAX_SIZE)
2824                 return -EBADMSG;
2825
2826         r = message_peek_body(m, &rindex, alignment, 0, NULL);
2827         if (r < 0)
2828                 return r;
2829         if (r == 0)
2830                 return -EBADMSG;
2831
2832         if (c->enclosing != SD_BUS_TYPE_ARRAY)
2833                 c->index += 1 + strlen(contents);
2834
2835         m->rindex = rindex;
2836
2837         *array_size = (uint32_t*) q;
2838
2839         return 1;
2840 }
2841
2842 static int bus_message_enter_variant(
2843                 sd_bus_message *m,
2844                 struct bus_container *c,
2845                 const char *contents) {
2846
2847         size_t rindex;
2848         uint8_t l;
2849         void *q;
2850         int r;
2851
2852         assert(m);
2853         assert(c);
2854         assert(contents);
2855
2856         if (!signature_is_single(contents, false))
2857                 return -EINVAL;
2858
2859         if (*contents == SD_BUS_TYPE_DICT_ENTRY_BEGIN)
2860                 return -EINVAL;
2861
2862         if (!c->signature || c->signature[c->index] == 0)
2863                 return 0;
2864
2865         if (c->signature[c->index] != SD_BUS_TYPE_VARIANT)
2866                 return -ENXIO;
2867
2868         rindex = m->rindex;
2869         r = message_peek_body(m, &rindex, 1, 1, &q);
2870         if (r <= 0)
2871                 return r;
2872
2873         l = *(uint8_t*) q;
2874         r = message_peek_body(m, &rindex, 1, l+1, &q);
2875         if (r < 0)
2876                 return r;
2877         if (r == 0)
2878                 return -EBADMSG;
2879
2880         if (!validate_signature(q, l))
2881                 return -EBADMSG;
2882
2883         if (!streq(q, contents))
2884                 return -ENXIO;
2885
2886         if (c->enclosing != SD_BUS_TYPE_ARRAY)
2887                 c->index++;
2888
2889         m->rindex = rindex;
2890
2891         return 1;
2892 }
2893
2894 static int bus_message_enter_struct(
2895                 sd_bus_message *m,
2896                 struct bus_container *c,
2897                 const char *contents) {
2898
2899         size_t l;
2900         int r;
2901
2902         assert(m);
2903         assert(c);
2904         assert(contents);
2905
2906         if (!signature_is_valid(contents, false))
2907                 return -EINVAL;
2908
2909         if (!c->signature || c->signature[c->index] == 0)
2910                 return 0;
2911
2912         l = strlen(contents);
2913
2914         if (c->signature[c->index] != SD_BUS_TYPE_STRUCT_BEGIN ||
2915             !startswith(c->signature + c->index + 1, contents) ||
2916             c->signature[c->index + 1 + l] != SD_BUS_TYPE_STRUCT_END)
2917                 return -ENXIO;
2918
2919         r = message_peek_body(m, &m->rindex, 8, 0, NULL);
2920         if (r <= 0)
2921                 return r;
2922
2923         if (c->enclosing != SD_BUS_TYPE_ARRAY)
2924                 c->index += 1 + l + 1;
2925
2926         return 1;
2927 }
2928
2929 static int bus_message_enter_dict_entry(
2930                 sd_bus_message *m,
2931                 struct bus_container *c,
2932                 const char *contents) {
2933
2934         size_t l;
2935         int r;
2936
2937         assert(m);
2938         assert(c);
2939         assert(contents);
2940
2941         if (!signature_is_pair(contents))
2942                 return -EINVAL;
2943
2944         if (c->enclosing != SD_BUS_TYPE_ARRAY)
2945                 return -ENXIO;
2946
2947         if (!c->signature || c->signature[c->index] == 0)
2948                 return 0;
2949
2950         l = strlen(contents);
2951
2952         if (c->signature[c->index] != SD_BUS_TYPE_DICT_ENTRY_BEGIN ||
2953             !startswith(c->signature + c->index + 1, contents) ||
2954             c->signature[c->index + 1 + l] != SD_BUS_TYPE_DICT_ENTRY_END)
2955                 return -ENXIO;
2956
2957         r = message_peek_body(m, &m->rindex, 8, 0, NULL);
2958         if (r <= 0)
2959                 return r;
2960
2961         if (c->enclosing != SD_BUS_TYPE_ARRAY)
2962                 c->index += 1 + l + 1;
2963
2964         return 1;
2965 }
2966
2967 int sd_bus_message_enter_container(sd_bus_message *m, char type, const char *contents) {
2968         struct bus_container *c, *w;
2969         uint32_t *array_size = NULL;
2970         char *signature;
2971         size_t before;
2972         int r;
2973
2974         if (!m)
2975                 return -EINVAL;
2976         if (!m->sealed)
2977                 return -EPERM;
2978         if (!contents)
2979                 return -EINVAL;
2980
2981         /*
2982          * We enforce a global limit on container depth, that is much
2983          * higher than the 32 structs and 32 arrays the specification
2984          * mandates. This is simpler to implement for us, and we need
2985          * this only to ensure our container array doesn't grow
2986          * without bounds. We are happy to return any data from a
2987          * message as long as the data itself is valid, even if the
2988          * overall message might be not.
2989          *
2990          * Note that the message signature is validated when
2991          * parsing the headers, and that validation does check the
2992          * 32/32 limit.
2993          *
2994          * Note that the specification defines no limits on the depth
2995          * of stacked variants, but we do.
2996          */
2997         if (m->n_containers >= BUS_CONTAINER_DEPTH)
2998                 return -EBADMSG;
2999
3000         w = realloc(m->containers, sizeof(struct bus_container) * (m->n_containers + 1));
3001         if (!w)
3002                 return -ENOMEM;
3003         m->containers = w;
3004
3005         c = message_get_container(m);
3006
3007         if (!c->signature || c->signature[c->index] == 0)
3008                 return 0;
3009
3010         signature = strdup(contents);
3011         if (!signature)
3012                 return -ENOMEM;
3013
3014         c->saved_index = c->index;
3015         before = m->rindex;
3016
3017         if (type == SD_BUS_TYPE_ARRAY)
3018                 r = bus_message_enter_array(m, c, contents, &array_size);
3019         else if (type == SD_BUS_TYPE_VARIANT)
3020                 r = bus_message_enter_variant(m, c, contents);
3021         else if (type == SD_BUS_TYPE_STRUCT)
3022                 r = bus_message_enter_struct(m, c, contents);
3023         else if (type == SD_BUS_TYPE_DICT_ENTRY)
3024                 r = bus_message_enter_dict_entry(m, c, contents);
3025         else
3026                 r = -EINVAL;
3027
3028         if (r <= 0) {
3029                 free(signature);
3030                 return r;
3031         }
3032
3033         /* OK, let's fill it in */
3034         w += m->n_containers++;
3035         w->enclosing = type;
3036         w->signature = signature;
3037         w->index = 0;
3038         w->array_size = array_size;
3039         w->before = before;
3040         w->begin = m->rindex;
3041
3042         return 1;
3043 }
3044
3045 int sd_bus_message_exit_container(sd_bus_message *m) {
3046         struct bus_container *c;
3047
3048         if (!m)
3049                 return -EINVAL;
3050         if (!m->sealed)
3051                 return -EPERM;
3052         if (m->n_containers <= 0)
3053                 return -EINVAL;
3054
3055         c = message_get_container(m);
3056         if (c->enclosing == SD_BUS_TYPE_ARRAY) {
3057                 uint32_t l;
3058
3059                 l = BUS_MESSAGE_BSWAP32(m, *c->array_size);
3060                 if (c->begin + l != m->rindex)
3061                         return -EBUSY;
3062
3063         } else {
3064                 if (c->signature && c->signature[c->index] != 0)
3065                         return -EINVAL;
3066         }
3067
3068         free(c->signature);
3069         m->n_containers--;
3070
3071         return 1;
3072 }
3073
3074 static void message_quit_container(sd_bus_message *m) {
3075         struct bus_container *c;
3076
3077         assert(m);
3078         assert(m->sealed);
3079         assert(m->n_containers > 0);
3080
3081         c = message_get_container(m);
3082
3083         /* Undo seeks */
3084         assert(m->rindex >= c->before);
3085         m->rindex = c->before;
3086
3087         /* Free container */
3088         free(c->signature);
3089         m->n_containers--;
3090
3091         /* Correct index of new top-level container */
3092         c = message_get_container(m);
3093         c->index = c->saved_index;
3094 }
3095
3096 int sd_bus_message_peek_type(sd_bus_message *m, char *type, const char **contents) {
3097         struct bus_container *c;
3098         int r;
3099
3100         if (!m)
3101                 return -EINVAL;
3102         if (!m->sealed)
3103                 return -EPERM;
3104
3105         c = message_get_container(m);
3106
3107         if (!c->signature || c->signature[c->index] == 0)
3108                 goto eof;
3109
3110         if (message_end_of_array(m, m->rindex))
3111                 goto eof;
3112
3113         if (bus_type_is_basic(c->signature[c->index])) {
3114                 if (contents)
3115                         *contents = NULL;
3116                 if (type)
3117                         *type = c->signature[c->index];
3118                 return 1;
3119         }
3120
3121         if (c->signature[c->index] == SD_BUS_TYPE_ARRAY) {
3122
3123                 if (contents) {
3124                         size_t l;
3125                         char *sig;
3126
3127                         r = signature_element_length(c->signature+c->index+1, &l);
3128                         if (r < 0)
3129                                 return r;
3130
3131                         assert(l >= 1);
3132
3133                         sig = strndup(c->signature + c->index + 1, l);
3134                         if (!sig)
3135                                 return -ENOMEM;
3136
3137                         free(m->peeked_signature);
3138                         m->peeked_signature = sig;
3139
3140                         *contents = sig;
3141                 }
3142
3143                 if (type)
3144                         *type = SD_BUS_TYPE_ARRAY;
3145
3146                 return 1;
3147         }
3148
3149         if (c->signature[c->index] == SD_BUS_TYPE_STRUCT_BEGIN ||
3150             c->signature[c->index] == SD_BUS_TYPE_DICT_ENTRY_BEGIN) {
3151
3152                 if (contents) {
3153                         size_t l;
3154                         char *sig;
3155
3156                         r = signature_element_length(c->signature+c->index, &l);
3157                         if (r < 0)
3158                                 return r;
3159
3160                         assert(l >= 2);
3161                         sig = strndup(c->signature + c->index + 1, l - 2);
3162                         if (!sig)
3163                                 return -ENOMEM;
3164
3165                         free(m->peeked_signature);
3166                         m->peeked_signature = sig;
3167
3168                         *contents = sig;
3169                 }
3170
3171                 if (type)
3172                         *type = c->signature[c->index] == SD_BUS_TYPE_STRUCT_BEGIN ? SD_BUS_TYPE_STRUCT : SD_BUS_TYPE_DICT_ENTRY;
3173
3174                 return 1;
3175         }
3176
3177         if (c->signature[c->index] == SD_BUS_TYPE_VARIANT) {
3178                 if (contents) {
3179                         size_t rindex, l;
3180                         void *q;
3181
3182                         rindex = m->rindex;
3183                         r = message_peek_body(m, &rindex, 1, 1, &q);
3184                         if (r < 0)
3185                                 return r;
3186                         if (r == 0)
3187                                 goto eof;
3188
3189                         l = *(uint8_t*) q;
3190                         r = message_peek_body(m, &rindex, 1, l+1, &q);
3191                         if (r < 0)
3192                                 return r;
3193                         if (r == 0)
3194                                 return -EBADMSG;
3195
3196                         if (!validate_signature(q, l))
3197                                 return -EBADMSG;
3198
3199                         *contents = q;
3200                 }
3201
3202                 if (type)
3203                         *type = SD_BUS_TYPE_VARIANT;
3204
3205                 return 1;
3206         }
3207
3208         return -EINVAL;
3209
3210 eof:
3211         if (type)
3212                 *type = c->enclosing;
3213         if (contents)
3214                 *contents = NULL;
3215         return 0;
3216 }
3217
3218 int sd_bus_message_rewind(sd_bus_message *m, int complete) {
3219         struct bus_container *c;
3220
3221         if (!m)
3222                 return -EINVAL;
3223         if (!m->sealed)
3224                 return -EPERM;
3225
3226         if (complete) {
3227                 message_reset_containers(m);
3228                 m->rindex = 0;
3229                 m->root_container.index = 0;
3230
3231                 c = message_get_container(m);
3232         } else {
3233                 c = message_get_container(m);
3234
3235                 c->index = 0;
3236                 m->rindex = c->begin;
3237         }
3238
3239         return !isempty(c->signature);
3240 }
3241 static int message_read_ap(
3242                 sd_bus_message *m,
3243                 const char *types,
3244                 va_list ap) {
3245
3246         unsigned n_array, n_struct;
3247         TypeStack stack[BUS_CONTAINER_DEPTH];
3248         unsigned stack_ptr = 0;
3249         int r;
3250
3251         assert(m);
3252
3253         if (!types)
3254                 return 0;
3255
3256         /* Ideally, we'd just call ourselves recursively on every
3257          * complex type. However, the state of a va_list that is
3258          * passed to a function is undefined after that function
3259          * returns. This means we need to docode the va_list linearly
3260          * in a single stackframe. We hence implement our own
3261          * home-grown stack in an array. */
3262
3263         n_array = (unsigned) -1;
3264         n_struct = strlen(types);
3265
3266         for (;;) {
3267                 const char *t;
3268
3269                 if (n_array == 0 || (n_array == (unsigned) -1 && n_struct == 0)) {
3270                         r = type_stack_pop(stack, ELEMENTSOF(stack), &stack_ptr, &types, &n_struct, &n_array);
3271                         if (r < 0)
3272                                 return r;
3273                         if (r == 0)
3274                                 break;
3275
3276                         r = sd_bus_message_exit_container(m);
3277                         if (r < 0)
3278                                 return r;
3279
3280                         continue;
3281                 }
3282
3283                 t = types;
3284                 if (n_array != (unsigned) -1)
3285                         n_array --;
3286                 else {
3287                         types ++;
3288                         n_struct--;
3289                 }
3290
3291                 switch (*t) {
3292
3293                 case SD_BUS_TYPE_BYTE:
3294                 case SD_BUS_TYPE_BOOLEAN:
3295                 case SD_BUS_TYPE_INT16:
3296                 case SD_BUS_TYPE_UINT16:
3297                 case SD_BUS_TYPE_INT32:
3298                 case SD_BUS_TYPE_UINT32:
3299                 case SD_BUS_TYPE_INT64:
3300                 case SD_BUS_TYPE_UINT64:
3301                 case SD_BUS_TYPE_DOUBLE:
3302                 case SD_BUS_TYPE_STRING:
3303                 case SD_BUS_TYPE_OBJECT_PATH:
3304                 case SD_BUS_TYPE_SIGNATURE:
3305                 case SD_BUS_TYPE_UNIX_FD: {
3306                         void *p;
3307
3308                         p = va_arg(ap, void*);
3309                         r = sd_bus_message_read_basic(m, *t, p);
3310                         if (r < 0)
3311                                 return r;
3312                         if (r == 0)
3313                                 return -ENXIO;
3314
3315                         break;
3316                 }
3317
3318                 case SD_BUS_TYPE_ARRAY: {
3319                         size_t k;
3320
3321                         r = signature_element_length(t + 1, &k);
3322                         if (r < 0)
3323                                 return r;
3324
3325                         {
3326                                 char s[k + 1];
3327                                 memcpy(s, t + 1, k);
3328                                 s[k] = 0;
3329
3330                                 r = sd_bus_message_enter_container(m, SD_BUS_TYPE_ARRAY, s);
3331                                 if (r < 0)
3332                                         return r;
3333                                 if (r == 0)
3334                                         return -ENXIO;
3335                         }
3336
3337                         if (n_array == (unsigned) -1) {
3338                                 types += k;
3339                                 n_struct -= k;
3340                         }
3341
3342                         r = type_stack_push(stack, ELEMENTSOF(stack), &stack_ptr, types, n_struct, n_array);
3343                         if (r < 0)
3344                                 return r;
3345
3346                         types = t + 1;
3347                         n_struct = k;
3348                         n_array = va_arg(ap, unsigned);
3349
3350                         break;
3351                 }
3352
3353                 case SD_BUS_TYPE_VARIANT: {
3354                         const char *s;
3355
3356                         s = va_arg(ap, const char *);
3357                         if (!s)
3358                                 return -EINVAL;
3359
3360                         r = sd_bus_message_enter_container(m, SD_BUS_TYPE_VARIANT, s);
3361                         if (r < 0)
3362                                 return r;
3363                         if (r == 0)
3364                                 return -ENXIO;
3365
3366                         r = type_stack_push(stack, ELEMENTSOF(stack), &stack_ptr, types, n_struct, n_array);
3367                         if (r < 0)
3368                                 return r;
3369
3370                         types = s;
3371                         n_struct = strlen(s);
3372                         n_array = (unsigned) -1;
3373
3374                         break;
3375                 }
3376
3377                 case SD_BUS_TYPE_STRUCT_BEGIN:
3378                 case SD_BUS_TYPE_DICT_ENTRY_BEGIN: {
3379                         size_t k;
3380
3381                         r = signature_element_length(t, &k);
3382                         if (r < 0)
3383                                 return r;
3384
3385                         {
3386                                 char s[k - 1];
3387                                 memcpy(s, t + 1, k - 2);
3388                                 s[k - 2] = 0;
3389
3390                                 r = sd_bus_message_enter_container(m, *t == SD_BUS_TYPE_STRUCT_BEGIN ? SD_BUS_TYPE_STRUCT : SD_BUS_TYPE_DICT_ENTRY, s);
3391                                 if (r < 0)
3392                                         return r;
3393                                 if (r == 0)
3394                                         return -ENXIO;
3395                         }
3396
3397                         if (n_array == (unsigned) -1) {
3398                                 types += k - 1;
3399                                 n_struct -= k - 1;
3400                         }
3401
3402                         r = type_stack_push(stack, ELEMENTSOF(stack), &stack_ptr, types, n_struct, n_array);
3403                         if (r < 0)
3404                                 return r;
3405
3406                         types = t + 1;
3407                         n_struct = k - 2;
3408                         n_array = (unsigned) -1;
3409
3410                         break;
3411                 }
3412
3413                 default:
3414                         return -EINVAL;
3415                 }
3416         }
3417
3418         return 1;
3419 }
3420
3421 int sd_bus_message_read(sd_bus_message *m, const char *types, ...) {
3422         va_list ap;
3423         int r;
3424
3425         if (!m)
3426                 return -EINVAL;
3427         if (!m->sealed)
3428                 return -EPERM;
3429         if (!types)
3430                 return -EINVAL;
3431
3432         va_start(ap, types);
3433         r = message_read_ap(m, types, ap);
3434         va_end(ap);
3435
3436         return r;
3437 }
3438
3439 int sd_bus_message_read_array(sd_bus_message *m, char type, const void **ptr, size_t *size) {
3440         struct bus_container *c;
3441         void *p;
3442         size_t sz;
3443         ssize_t align;
3444         int r;
3445
3446         if (!m)
3447                 return -EINVAL;
3448         if (!m->sealed)
3449                 return -EPERM;
3450         if (!bus_type_is_trivial(type))
3451                 return -EINVAL;
3452         if (!ptr)
3453                 return -EINVAL;
3454         if (!size)
3455                 return -EINVAL;
3456         if (BUS_MESSAGE_NEED_BSWAP(m))
3457                 return -ENOTSUP;
3458
3459         align = bus_type_get_alignment(type);
3460         if (align < 0)
3461                 return align;
3462
3463         r = sd_bus_message_enter_container(m, SD_BUS_TYPE_ARRAY, CHAR_TO_STR(type));
3464         if (r <= 0)
3465                 return r;
3466
3467         c = message_get_container(m);
3468         sz = BUS_MESSAGE_BSWAP32(m, *c->array_size);
3469
3470         r = message_peek_body(m, &m->rindex, align, sz, &p);
3471         if (r < 0)
3472                 goto fail;
3473         if (r == 0) {
3474                 r = -EBADMSG;
3475                 goto fail;
3476         }
3477
3478         r = sd_bus_message_exit_container(m);
3479         if (r < 0)
3480                 goto fail;
3481
3482         *ptr = (const void*) p;
3483         *size = sz;
3484
3485         return 1;
3486
3487 fail:
3488         message_quit_container(m);
3489         return r;
3490 }
3491
3492 static int message_peek_fields(
3493                 sd_bus_message *m,
3494                 size_t *rindex,
3495                 size_t align,
3496                 size_t nbytes,
3497                 void **ret) {
3498
3499         assert(m);
3500         assert(rindex);
3501         assert(align > 0);
3502
3503         return buffer_peek(BUS_MESSAGE_FIELDS(m), BUS_MESSAGE_FIELDS_SIZE(m), rindex, align, nbytes, ret);
3504 }
3505
3506 static int message_peek_field_uint32(
3507                 sd_bus_message *m,
3508                 size_t *ri,
3509                 uint32_t *ret) {
3510
3511         int r;
3512         void *q;
3513
3514         assert(m);
3515         assert(ri);
3516
3517         r = message_peek_fields(m, ri, 4, 4, &q);
3518         if (r < 0)
3519                 return r;
3520
3521         if (ret)
3522                 *ret = BUS_MESSAGE_BSWAP32(m, *(uint32_t*) q);
3523
3524         return 0;
3525 }
3526
3527 static int message_peek_field_string(
3528                 sd_bus_message *m,
3529                 bool (*validate)(const char *p),
3530                 size_t *ri,
3531                 const char **ret) {
3532
3533         uint32_t l;
3534         int r;
3535         void *q;
3536
3537         assert(m);
3538         assert(ri);
3539
3540         r = message_peek_field_uint32(m, ri, &l);
3541         if (r < 0)
3542                 return r;
3543
3544         r = message_peek_fields(m, ri, 1, l+1, &q);
3545         if (r < 0)
3546                 return r;
3547
3548         if (validate) {
3549                 if (!validate_nul(q, l))
3550                         return -EBADMSG;
3551
3552                 if (!validate(q))
3553                         return -EBADMSG;
3554         } else {
3555                 if (!validate_string(q, l))
3556                         return -EBADMSG;
3557         }
3558
3559         if (ret)
3560                 *ret = q;
3561
3562         return 0;
3563 }
3564
3565 static int message_peek_field_signature(
3566                 sd_bus_message *m,
3567                 size_t *ri,
3568                 const char **ret) {
3569
3570         size_t l;
3571         int r;
3572         void *q;
3573
3574         assert(m);
3575         assert(ri);
3576
3577         r = message_peek_fields(m, ri, 1, 1, &q);
3578         if (r < 0)
3579                 return r;
3580
3581         l = *(uint8_t*) q;
3582         r = message_peek_fields(m, ri, 1, l+1, &q);
3583         if (r < 0)
3584                 return r;
3585
3586         if (!validate_signature(q, l))
3587                 return -EBADMSG;
3588
3589         if (ret)
3590                 *ret = q;
3591
3592         return 0;
3593 }
3594
3595 static int message_skip_fields(
3596                 sd_bus_message *m,
3597                 size_t *ri,
3598                 uint32_t array_size,
3599                 const char **signature) {
3600
3601         size_t original_index;
3602         int r;
3603
3604         assert(m);
3605         assert(ri);
3606         assert(signature);
3607
3608         original_index = *ri;
3609
3610         for (;;) {
3611                 char t;
3612                 size_t l;
3613
3614                 if (array_size != (uint32_t) -1 &&
3615                     array_size <= *ri - original_index)
3616                         return 0;
3617
3618                 t = **signature;
3619                 if (!t)
3620                         return 0;
3621
3622                 if (t == SD_BUS_TYPE_STRING) {
3623
3624                         r = message_peek_field_string(m, NULL, ri, NULL);
3625                         if (r < 0)
3626                                 return r;
3627
3628                         (*signature)++;
3629
3630                 } else if (t == SD_BUS_TYPE_OBJECT_PATH) {
3631
3632                         r = message_peek_field_string(m, object_path_is_valid, ri, NULL);
3633                         if (r < 0)
3634                                 return r;
3635
3636                         (*signature)++;
3637
3638                 } else if (t == SD_BUS_TYPE_SIGNATURE) {
3639
3640                         r = message_peek_field_signature(m, ri, NULL);
3641                         if (r < 0)
3642                                 return r;
3643
3644                         (*signature)++;
3645
3646                 } else if (bus_type_is_basic(t)) {
3647                         ssize_t align, k;
3648
3649                         align = bus_type_get_alignment(t);
3650                         k = bus_type_get_size(t);
3651                         assert(align > 0 && k > 0);
3652
3653                         r = message_peek_fields(m, ri, align, k, NULL);
3654                         if (r < 0)
3655                                 return r;
3656
3657                         (*signature)++;
3658
3659                 } else if (t == SD_BUS_TYPE_ARRAY) {
3660
3661                         r = signature_element_length(*signature+1, &l);
3662                         if (r < 0)
3663                                 return r;
3664
3665                         assert(l >= 1);
3666                         {
3667                                 char sig[l-1], *s;
3668                                 uint32_t nas;
3669                                 int alignment;
3670
3671                                 strncpy(sig, *signature + 1, l-1);
3672                                 s = sig;
3673
3674                                 alignment = bus_type_get_alignment(sig[0]);
3675                                 if (alignment < 0)
3676                                         return alignment;
3677
3678                                 r = message_peek_field_uint32(m, ri, &nas);
3679                                 if (r < 0)
3680                                         return r;
3681                                 if (nas > BUS_ARRAY_MAX_SIZE)
3682                                         return -EBADMSG;
3683
3684                                 r = message_peek_fields(m, ri, alignment, 0, NULL);
3685                                 if (r < 0)
3686                                         return r;
3687
3688                                 r = message_skip_fields(m, ri, nas, (const char**) &s);
3689                                 if (r < 0)
3690                                         return r;
3691                         }
3692
3693                         (*signature) += 1 + l;
3694
3695                 } else if (t == SD_BUS_TYPE_VARIANT) {
3696                         const char *s;
3697
3698                         r = message_peek_field_signature(m, ri, &s);
3699                         if (r < 0)
3700                                 return r;
3701
3702                         r = message_skip_fields(m, ri, (uint32_t) -1, (const char**) &s);
3703                         if (r < 0)
3704                                 return r;
3705
3706                         (*signature)++;
3707
3708                 } else if (t == SD_BUS_TYPE_STRUCT ||
3709                            t == SD_BUS_TYPE_DICT_ENTRY) {
3710
3711                         r = signature_element_length(*signature, &l);
3712                         if (r < 0)
3713                                 return r;
3714
3715                         assert(l >= 2);
3716                         {
3717                                 char sig[l-1], *s;
3718                                 strncpy(sig, *signature + 1, l-1);
3719                                 s = sig;
3720
3721                                 r = message_skip_fields(m, ri, (uint32_t) -1, (const char**) &s);
3722                                 if (r < 0)
3723                                         return r;
3724                         }
3725
3726                         *signature += l;
3727                 } else
3728                         return -EINVAL;
3729         }
3730 }
3731
3732 int bus_message_parse_fields(sd_bus_message *m) {
3733         size_t ri;
3734         int r;
3735         uint32_t unix_fds = 0;
3736
3737         assert(m);
3738
3739         for (ri = 0; ri < BUS_MESSAGE_FIELDS_SIZE(m); ) {
3740                 const char *signature;
3741                 uint8_t *header;
3742
3743                 r = message_peek_fields(m, &ri, 8, 1, (void**) &header);
3744                 if (r < 0)
3745                         return r;
3746
3747                 r = message_peek_field_signature(m, &ri, &signature);
3748                 if (r < 0)
3749                         return r;
3750
3751                 switch (*header) {
3752                 case _SD_BUS_MESSAGE_HEADER_INVALID:
3753                         return -EBADMSG;
3754
3755                 case SD_BUS_MESSAGE_HEADER_PATH:
3756
3757                         if (m->path)
3758                                 return -EBADMSG;
3759
3760                         if (!streq(signature, "o"))
3761                                 return -EBADMSG;
3762
3763                         r = message_peek_field_string(m, object_path_is_valid, &ri, &m->path);
3764                         break;
3765
3766                 case SD_BUS_MESSAGE_HEADER_INTERFACE:
3767
3768                         if (m->interface)
3769                                 return -EBADMSG;
3770
3771                         if (!streq(signature, "s"))
3772                                 return -EBADMSG;
3773
3774                         r = message_peek_field_string(m, interface_name_is_valid, &ri, &m->interface);
3775                         break;
3776
3777                 case SD_BUS_MESSAGE_HEADER_MEMBER:
3778
3779                         if (m->member)
3780                                 return -EBADMSG;
3781
3782                         if (!streq(signature, "s"))
3783                                 return -EBADMSG;
3784
3785                         r = message_peek_field_string(m, member_name_is_valid, &ri, &m->member);
3786                         break;
3787
3788                 case SD_BUS_MESSAGE_HEADER_ERROR_NAME:
3789
3790                         if (m->error.name)
3791                                 return -EBADMSG;
3792
3793                         if (!streq(signature, "s"))
3794                                 return -EBADMSG;
3795
3796                         r = message_peek_field_string(m, error_name_is_valid, &ri, &m->error.name);
3797                         break;
3798
3799                 case SD_BUS_MESSAGE_HEADER_DESTINATION:
3800
3801                         if (m->destination)
3802                                 return -EBADMSG;
3803
3804                         if (!streq(signature, "s"))
3805                                 return -EBADMSG;
3806
3807                         r = message_peek_field_string(m, service_name_is_valid, &ri, &m->destination);
3808                         break;
3809
3810                 case SD_BUS_MESSAGE_HEADER_SENDER:
3811
3812                         if (m->sender)
3813                                 return -EBADMSG;
3814
3815                         if (!streq(signature, "s"))
3816                                 return -EBADMSG;
3817
3818                         r = message_peek_field_string(m, service_name_is_valid, &ri, &m->sender);
3819                         break;
3820
3821
3822                 case SD_BUS_MESSAGE_HEADER_SIGNATURE: {
3823                         const char *s;
3824                         char *c;
3825
3826                         if (m->root_container.signature)
3827                                 return -EBADMSG;
3828
3829                         if (!streq(signature, "g"))
3830                                 return -EBADMSG;
3831
3832                         r = message_peek_field_signature(m, &ri, &s);
3833                         if (r < 0)
3834                                 return r;
3835
3836                         c = strdup(s);
3837                         if (!c)
3838                                 return -ENOMEM;
3839
3840                         free(m->root_container.signature);
3841                         m->root_container.signature = c;
3842                         break;
3843                 }
3844
3845                 case SD_BUS_MESSAGE_HEADER_REPLY_SERIAL:
3846                         if (m->reply_serial != 0)
3847                                 return -EBADMSG;
3848
3849                         if (!streq(signature, "u"))
3850                                 return -EBADMSG;
3851
3852                         r = message_peek_field_uint32(m, &ri, &m->reply_serial);
3853                         if (r < 0)
3854                                 return r;
3855
3856                         if (m->reply_serial == 0)
3857                                 return -EBADMSG;
3858
3859                         break;
3860
3861                 case SD_BUS_MESSAGE_HEADER_UNIX_FDS:
3862                         if (unix_fds != 0)
3863                                 return -EBADMSG;
3864
3865                         if (!streq(signature, "u"))
3866                                 return -EBADMSG;
3867
3868                         r = message_peek_field_uint32(m, &ri, &unix_fds);
3869                         if (r < 0)
3870                                 return -EBADMSG;
3871
3872                         if (unix_fds == 0)
3873                                 return -EBADMSG;
3874
3875                         break;
3876
3877                 default:
3878                         r = message_skip_fields(m, &ri, (uint32_t) -1, (const char **) &signature);
3879                 }
3880
3881                 if (r < 0)
3882                         return r;
3883         }
3884
3885         if (m->n_fds != unix_fds)
3886                 return -EBADMSG;
3887
3888         if (isempty(m->root_container.signature) != (BUS_MESSAGE_BODY_SIZE(m) == 0))
3889                 return -EBADMSG;
3890
3891         switch (m->header->type) {
3892
3893         case SD_BUS_MESSAGE_SIGNAL:
3894                 if (!m->path || !m->interface || !m->member)
3895                         return -EBADMSG;
3896                 break;
3897
3898         case SD_BUS_MESSAGE_METHOD_CALL:
3899
3900                 if (!m->path || !m->member)
3901                         return -EBADMSG;
3902
3903                 break;
3904
3905         case SD_BUS_MESSAGE_METHOD_RETURN:
3906
3907                 if (m->reply_serial == 0)
3908                         return -EBADMSG;
3909                 break;
3910
3911         case SD_BUS_MESSAGE_METHOD_ERROR:
3912
3913                 if (m->reply_serial == 0 || !m->error.name)
3914                         return -EBADMSG;
3915                 break;
3916         }
3917
3918         /* Try to read the error message, but if we can't it's a non-issue */
3919         if (m->header->type == SD_BUS_MESSAGE_METHOD_ERROR)
3920                 sd_bus_message_read(m, "s", &m->error.message);
3921
3922         return 0;
3923 }
3924
3925 int bus_message_seal(sd_bus_message *m, uint64_t serial) {
3926         struct bus_body_part *part;
3927         size_t l, a;
3928         unsigned i;
3929         int r;
3930
3931         assert(m);
3932
3933         if (m->sealed)
3934                 return -EPERM;
3935
3936         if (m->n_containers > 0)
3937                 return -EBADMSG;
3938
3939         if (m->poisoned)
3940                 return -ESTALE;
3941
3942         /* If there's a non-trivial signature set, then add it in here */
3943         if (!isempty(m->root_container.signature)) {
3944                 r = message_append_field_signature(m, SD_BUS_MESSAGE_HEADER_SIGNATURE, m->root_container.signature, NULL);
3945                 if (r < 0)
3946                         return r;
3947         }
3948
3949         if (m->n_fds > 0) {
3950                 r = message_append_field_uint32(m, SD_BUS_MESSAGE_HEADER_UNIX_FDS, m->n_fds);
3951                 if (r < 0)
3952                         return r;
3953         }
3954
3955         /* Add padding at the end of the fields part, since we know
3956          * the body needs to start at an 8 byte alignment. We made
3957          * sure we allocated enough space for this, so all we need to
3958          * do here is to zero it out. */
3959         l = BUS_MESSAGE_FIELDS_SIZE(m);
3960         a = ALIGN8(l) - l;
3961         if (a > 0)
3962                 memset((uint8_t*) BUS_MESSAGE_FIELDS(m) + l, 0, a);
3963
3964         /* If this is something we can send as memfd, then let's seal
3965         the memfd now. Note that we can send memfds as payload only
3966         for directed messages, and not for broadcasts. */
3967         if (m->destination && m->bus && m->bus->use_memfd) {
3968                 MESSAGE_FOREACH_PART(part, i, m)
3969                         if (part->memfd >= 0 && !part->sealed && (part->size > MEMFD_MIN_SIZE || m->bus->use_memfd < 0)) {
3970                                 bus_body_part_unmap(part);
3971
3972                                 if (ioctl(part->memfd, KDBUS_CMD_MEMFD_SEAL_SET, 1) >= 0)
3973                                         part->sealed = true;
3974                         }
3975         }
3976
3977         m->header->serial = serial;
3978         m->sealed = true;
3979
3980         return 0;
3981 }
3982
3983 int sd_bus_message_set_destination(sd_bus_message *m, const char *destination) {
3984         if (!m)
3985                 return -EINVAL;
3986         if (!destination)
3987                 return -EINVAL;
3988         if (m->sealed)
3989                 return -EPERM;
3990         if (m->destination)
3991                 return -EEXIST;
3992
3993         return message_append_field_string(m, SD_BUS_MESSAGE_HEADER_DESTINATION, SD_BUS_TYPE_STRING, destination, &m->destination);
3994 }
3995
3996 int bus_message_dump(sd_bus_message *m) {
3997         const char *u = NULL, *uu = NULL, *s = NULL;
3998         char **cmdline = NULL;
3999         unsigned level = 1;
4000         int r;
4001         uid_t owner, audit_loginuid;
4002         uint32_t audit_sessionid;
4003
4004         assert(m);
4005
4006         printf("Message %p\n"
4007                "\tn_ref=%u\n"
4008                "\tendian=%c\n"
4009                "\ttype=%i\n"
4010                "\tflags=%u\n"
4011                "\tversion=%u\n"
4012                "\tserial=%u\n"
4013                "\tfields_size=%u\n"
4014                "\tbody_size=%u\n"
4015                "\tpath=%s\n"
4016                "\tinterface=%s\n"
4017                "\tmember=%s\n"
4018                "\tdestination=%s\n"
4019                "\tsender=%s\n"
4020                "\tsignature=%s\n"
4021                "\treply_serial=%u\n"
4022                "\terror.name=%s\n"
4023                "\terror.message=%s\n"
4024                "\tsealed=%s\n"
4025                "\tn_body_parts=%u\n",
4026                m,
4027                m->n_ref,
4028                m->header->endian,
4029                m->header->type,
4030                m->header->flags,
4031                m->header->version,
4032                BUS_MESSAGE_SERIAL(m),
4033                BUS_MESSAGE_FIELDS_SIZE(m),
4034                BUS_MESSAGE_BODY_SIZE(m),
4035                strna(m->path),
4036                strna(m->interface),
4037                strna(m->member),
4038                strna(m->destination),
4039                strna(m->sender),
4040                strna(m->root_container.signature),
4041                m->reply_serial,
4042                strna(m->error.name),
4043                strna(m->error.message),
4044                yes_no(m->sealed),
4045                m->n_body_parts);
4046
4047         if (m->pid != 0)
4048                 printf("\tpid=%lu\n", (unsigned long) m->pid);
4049         if (m->tid != 0)
4050                 printf("\ttid=%lu\n", (unsigned long) m->tid);
4051         if (m->uid_valid)
4052                 printf("\tuid=%lu\n", (unsigned long) m->uid);
4053         if (m->gid_valid)
4054                 printf("\tgid=%lu\n", (unsigned long) m->gid);
4055         if (m->pid_starttime != 0)
4056                 printf("\tpid_starttime=%llu\n", (unsigned long long) m->pid_starttime);
4057         if (m->monotonic != 0)
4058                 printf("\tmonotonic=%llu\n", (unsigned long long) m->monotonic);
4059         if (m->realtime != 0)
4060                 printf("\trealtime=%llu\n", (unsigned long long) m->realtime);
4061         if (m->exe)
4062                 printf("\texe=[%s]\n", m->exe);
4063         if (m->comm)
4064                 printf("\tcomm=[%s]\n", m->comm);
4065         if (m->tid_comm)
4066                 printf("\ttid_comm=[%s]\n", m->tid_comm);
4067         if (m->label)
4068                 printf("\tlabel=[%s]\n", m->label);
4069         if (m->cgroup)
4070                 printf("\tcgroup=[%s]\n", m->cgroup);
4071
4072         sd_bus_message_get_unit(m, &u);
4073         if (u)
4074                 printf("\tunit=[%s]\n", u);
4075         sd_bus_message_get_user_unit(m, &uu);
4076         if (uu)
4077                 printf("\tuser_unit=[%s]\n", uu);
4078         sd_bus_message_get_session(m, &s);
4079         if (s)
4080                 printf("\tsession=[%s]\n", s);
4081         if (sd_bus_message_get_owner_uid(m, &owner) >= 0)
4082                 printf("\towner_uid=%lu\n", (unsigned long) owner);
4083         if (sd_bus_message_get_audit_loginuid(m, &audit_loginuid) >= 0)
4084                 printf("\taudit_loginuid=%lu\n", (unsigned long) audit_loginuid);
4085         if (sd_bus_message_get_audit_sessionid(m, &audit_sessionid) >= 0)
4086                 printf("\taudit_sessionid=%lu\n", (unsigned long) audit_sessionid);
4087
4088         printf("\tCAP_KILL=%i\n", sd_bus_message_has_effective_cap(m, 5));
4089
4090         if (sd_bus_message_get_cmdline(m, &cmdline) >= 0) {
4091                 char **c;
4092
4093                 fputs("\tcmdline=[", stdout);
4094                 STRV_FOREACH(c, cmdline) {
4095                         if (c != cmdline)
4096                                 putchar(' ');
4097
4098                         fputs(*c, stdout);
4099                 }
4100
4101                 fputs("]\n", stdout);
4102         }
4103
4104         r = sd_bus_message_rewind(m, true);
4105         if (r < 0) {
4106                 log_error("Failed to rewind: %s", strerror(-r));
4107                 return r;
4108         }
4109
4110         printf("BEGIN_MESSAGE \"%s\" {\n", strempty(m->root_container.signature));
4111
4112         for(;;) {
4113                 _cleanup_free_ char *prefix = NULL;
4114                 const char *contents = NULL;
4115                 char type;
4116                 union {
4117                         uint8_t u8;
4118                         uint16_t u16;
4119                         int16_t s16;
4120                         uint32_t u32;
4121                         int32_t s32;
4122                         uint64_t u64;
4123                         int64_t s64;
4124                         double d64;
4125                         const char *string;
4126                         int i;
4127                 } basic;
4128
4129                 r = sd_bus_message_peek_type(m, &type, &contents);
4130                 if (r < 0) {
4131                         log_error("Failed to peek type: %s", strerror(-r));
4132                         return r;
4133                 }
4134                 if (r == 0) {
4135                         if (level <= 1)
4136                                 break;
4137
4138                         r = sd_bus_message_exit_container(m);
4139                         if (r < 0) {
4140                                 log_error("Failed to exit container: %s", strerror(-r));
4141                                 return r;
4142                         }
4143
4144                         level--;
4145
4146                         prefix = strrep("\t", level);
4147                         if (!prefix)
4148                                 return log_oom();
4149
4150                         if (type == SD_BUS_TYPE_ARRAY)
4151                                 printf("%s} END_ARRAY \n", prefix);
4152                         else if (type == SD_BUS_TYPE_VARIANT)
4153                                 printf("%s} END_VARIANT\n", prefix);
4154                         else if (type == SD_BUS_TYPE_STRUCT)
4155                                 printf("%s} END_STRUCT\n", prefix);
4156                         else if (type == SD_BUS_TYPE_DICT_ENTRY)
4157                                 printf("%s} END_DICT_ENTRY\n", prefix);
4158
4159                         continue;
4160                 }
4161
4162                 prefix = strrep("\t", level);
4163                 if (!prefix)
4164                         return log_oom();
4165
4166                 if (bus_type_is_container(type) > 0) {
4167                         r = sd_bus_message_enter_container(m, type, contents);
4168                         if (r < 0) {
4169                                 log_error("Failed to enter container: %s", strerror(-r));
4170                                 return r;
4171                         }
4172
4173                         if (type == SD_BUS_TYPE_ARRAY)
4174                                 printf("%sBEGIN_ARRAY \"%s\" {\n", prefix, contents);
4175                         else if (type == SD_BUS_TYPE_VARIANT)
4176                                 printf("%sBEGIN_VARIANT \"%s\" {\n", prefix, contents);
4177                         else if (type == SD_BUS_TYPE_STRUCT)
4178                                 printf("%sBEGIN_STRUCT \"%s\" {\n", prefix, contents);
4179                         else if (type == SD_BUS_TYPE_DICT_ENTRY)
4180                                 printf("%sBEGIN_DICT_ENTRY \"%s\" {\n", prefix, contents);
4181
4182                         level ++;
4183
4184                         continue;
4185                 }
4186
4187                 r = sd_bus_message_read_basic(m, type, &basic);
4188                 if (r < 0) {
4189                         log_error("Failed to get basic: %s", strerror(-r));
4190                         return r;
4191                 }
4192
4193                 switch (type) {
4194
4195                 case SD_BUS_TYPE_BYTE:
4196                         printf("%sBYTE: %u\n", prefix, basic.u8);
4197                         break;
4198
4199                 case SD_BUS_TYPE_BOOLEAN:
4200                         printf("%sBOOLEAN: %s\n", prefix, yes_no(basic.i));
4201                         break;
4202
4203                 case SD_BUS_TYPE_INT16:
4204                         printf("%sINT16: %i\n", prefix, basic.s16);
4205                         break;
4206
4207                 case SD_BUS_TYPE_UINT16:
4208                         printf("%sUINT16: %u\n", prefix, basic.u16);
4209                         break;
4210
4211                 case SD_BUS_TYPE_INT32:
4212                         printf("%sINT32: %i\n", prefix, basic.s32);
4213                         break;
4214
4215                 case SD_BUS_TYPE_UINT32:
4216                         printf("%sUINT32: %u\n", prefix, basic.u32);
4217                         break;
4218
4219                 case SD_BUS_TYPE_INT64:
4220                         printf("%sINT64: %lli\n", prefix, (long long) basic.s64);
4221                         break;
4222
4223                 case SD_BUS_TYPE_UINT64:
4224                         printf("%sUINT64: %llu\n", prefix, (unsigned long long) basic.u64);
4225                         break;
4226
4227                 case SD_BUS_TYPE_DOUBLE:
4228                         printf("%sDOUBLE: %g\n", prefix, basic.d64);
4229                         break;
4230
4231                 case SD_BUS_TYPE_STRING:
4232                         printf("%sSTRING: \"%s\"\n", prefix, basic.string);
4233                         break;
4234
4235                 case SD_BUS_TYPE_OBJECT_PATH:
4236                         printf("%sOBJECT_PATH: \"%s\"\n", prefix, basic.string);
4237                         break;
4238
4239                 case SD_BUS_TYPE_SIGNATURE:
4240                         printf("%sSIGNATURE: \"%s\"\n", prefix, basic.string);
4241                         break;
4242
4243                 case SD_BUS_TYPE_UNIX_FD:
4244                         printf("%sUNIX_FD: %i\n", prefix, basic.i);
4245                         break;
4246
4247                 default:
4248                         assert_not_reached("Unknown basic type.");
4249                 }
4250         }
4251
4252         printf("} END_MESSAGE\n");
4253         return 0;
4254 }
4255
4256 int bus_message_get_blob(sd_bus_message *m, void **buffer, size_t *sz) {
4257         size_t total;
4258         void *p, *e;
4259         unsigned i;
4260         struct bus_body_part *part;
4261
4262         assert(m);
4263         assert(buffer);
4264         assert(sz);
4265
4266         total = BUS_MESSAGE_SIZE(m);
4267
4268         p = malloc(total);
4269         if (!p)
4270                 return -ENOMEM;
4271
4272         e = mempcpy(p, m->header, BUS_MESSAGE_BODY_BEGIN(m));
4273         MESSAGE_FOREACH_PART(part, i, m)
4274                 e = mempcpy(e, part->data, part->size);
4275
4276         assert(total == (size_t) ((uint8_t*) e - (uint8_t*) p));
4277
4278         *buffer = p;
4279         *sz = total;
4280
4281         return 0;
4282 }
4283
4284 int bus_message_read_strv_extend(sd_bus_message *m, char ***l) {
4285         int r;
4286
4287         assert(m);
4288         assert(l);
4289
4290         r = sd_bus_message_enter_container(m, 'a', "s");
4291         if (r < 0)
4292                 return r;
4293
4294         for (;;) {
4295                 const char *s;
4296
4297                 r = sd_bus_message_read_basic(m, 's', &s);
4298                 if (r < 0)
4299                         return r;
4300                 if (r == 0)
4301                         break;
4302
4303                 r = strv_extend(l, s);
4304                 if (r < 0)
4305                         return r;
4306         }
4307
4308         r = sd_bus_message_exit_container(m);
4309         if (r < 0)
4310                 return r;
4311
4312         return 0;
4313 }
4314
4315 const char* bus_message_get_arg(sd_bus_message *m, unsigned i) {
4316         int r;
4317         const char *t = NULL;
4318         unsigned j;
4319
4320         assert(m);
4321
4322         r = sd_bus_message_rewind(m, true);
4323         if (r < 0)
4324                 return NULL;
4325
4326         for (j = 0; j <= i; j++) {
4327                 char type;
4328
4329                 r = sd_bus_message_peek_type(m, &type, NULL);
4330                 if (r < 0)
4331                         return NULL;
4332
4333                 if (type != SD_BUS_TYPE_STRING &&
4334                     type != SD_BUS_TYPE_OBJECT_PATH &&
4335                     type != SD_BUS_TYPE_SIGNATURE)
4336                         return NULL;
4337
4338                 r = sd_bus_message_read_basic(m, type, &t);
4339                 if (r < 0)
4340                         return NULL;
4341         }
4342
4343         return t;
4344 }
4345
4346 bool bus_header_is_complete(struct bus_header *h, size_t size) {
4347         size_t full;
4348
4349         assert(h);
4350         assert(size);
4351
4352         if (size < sizeof(struct bus_header))
4353                 return false;
4354
4355         full = sizeof(struct bus_header) +
4356                 (h->endian == SD_BUS_NATIVE_ENDIAN ? h->fields_size : bswap_32(h->fields_size));
4357
4358         return size >= full;
4359 }
4360
4361 int bus_header_message_size(struct bus_header *h, size_t *sum) {
4362         size_t fs, bs;
4363
4364         assert(h);
4365         assert(sum);
4366
4367         if (h->endian == SD_BUS_NATIVE_ENDIAN) {
4368                 fs = h->fields_size;
4369                 bs = h->body_size;
4370         } else if (h->endian == SD_BUS_REVERSE_ENDIAN) {
4371                 fs = bswap_32(h->fields_size);
4372                 bs = bswap_32(h->body_size);
4373         } else
4374                 return -EBADMSG;
4375
4376         *sum = sizeof(struct bus_header) + ALIGN8(fs) + bs;
4377         return 0;
4378 }
4379
4380 int sd_bus_message_get_errno(sd_bus_message *m) {
4381         assert_return(m, -EINVAL);
4382
4383         if (m->header->type != SD_BUS_MESSAGE_METHOD_ERROR)
4384                 return 0;
4385
4386         return sd_bus_error_get_errno(&m->error);
4387 }
4388
4389 const char* sd_bus_message_get_signature(sd_bus_message *m, int complete) {
4390         struct bus_container *c;
4391
4392         if (!m)
4393                 return NULL;
4394
4395         c = complete ? &m->root_container : message_get_container(m);
4396         return c->signature ?: "";
4397 }