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 -ENXIO;
2661
2662         if (message_end_of_array(m, m->rindex))
2663                 return 0;
2664
2665         if (c->signature[c->index] != type)
2666                 return -ENXIO;
2667
2668         switch (type) {
2669
2670         case SD_BUS_TYPE_STRING:
2671         case SD_BUS_TYPE_OBJECT_PATH: {
2672                 uint32_t l;
2673                 size_t rindex;
2674
2675                 rindex = m->rindex;
2676                 r = message_peek_body(m, &rindex, 4, 4, &q);
2677                 if (r <= 0)
2678                         return r;
2679
2680                 l = BUS_MESSAGE_BSWAP32(m, *(uint32_t*) q);
2681                 r = message_peek_body(m, &rindex, 1, l+1, &q);
2682                 if (r < 0)
2683                         return r;
2684                 if (r == 0)
2685                         return -EBADMSG;
2686
2687                 if (type == SD_BUS_TYPE_OBJECT_PATH) {
2688                         if (!validate_object_path(q, l))
2689                                 return -EBADMSG;
2690                 } else {
2691                         if (!validate_string(q, l))
2692                                 return -EBADMSG;
2693                 }
2694
2695                 m->rindex = rindex;
2696                 *(const char**) p = q;
2697                 break;
2698         }
2699
2700         case SD_BUS_TYPE_SIGNATURE: {
2701                 uint8_t l;
2702                 size_t rindex;
2703
2704                 rindex = m->rindex;
2705                 r = message_peek_body(m, &rindex, 1, 1, &q);
2706                 if (r <= 0)
2707                         return r;
2708
2709                 l = *(uint8_t*) q;
2710                 r = message_peek_body(m, &rindex, 1, l+1, &q);
2711                 if (r < 0)
2712                         return r;
2713                 if (r == 0)
2714                         return -EBADMSG;
2715
2716                 if (!validate_signature(q, l))
2717                         return -EBADMSG;
2718
2719                 m->rindex = rindex;
2720                 *(const char**) p = q;
2721                 break;
2722         }
2723
2724         default: {
2725                 ssize_t sz, align;
2726                 size_t rindex;
2727
2728                 align = bus_type_get_alignment(type);
2729                 sz = bus_type_get_size(type);
2730                 assert(align > 0 && sz > 0);
2731
2732                 rindex = m->rindex;
2733                 r = message_peek_body(m, &rindex, align, sz, &q);
2734                 if (r <= 0)
2735                         return r;
2736
2737                 switch (type) {
2738
2739                 case SD_BUS_TYPE_BYTE:
2740                         *(uint8_t*) p = *(uint8_t*) q;
2741                         break;
2742
2743                 case SD_BUS_TYPE_BOOLEAN:
2744                         *(unsigned*) p = !!*(uint32_t*) q;
2745                         break;
2746
2747                 case SD_BUS_TYPE_INT16:
2748                 case SD_BUS_TYPE_UINT16:
2749                         *(uint16_t*) p = BUS_MESSAGE_BSWAP16(m, *(uint16_t*) q);
2750                         break;
2751
2752                 case SD_BUS_TYPE_INT32:
2753                 case SD_BUS_TYPE_UINT32:
2754                         *(uint32_t*) p = BUS_MESSAGE_BSWAP32(m, *(uint32_t*) q);
2755                         break;
2756
2757                 case SD_BUS_TYPE_INT64:
2758                 case SD_BUS_TYPE_UINT64:
2759                 case SD_BUS_TYPE_DOUBLE:
2760                         *(uint64_t*) p = BUS_MESSAGE_BSWAP64(m, *(uint64_t*) q);
2761                         break;
2762
2763                 case SD_BUS_TYPE_UNIX_FD: {
2764                         uint32_t j;
2765
2766                         j = BUS_MESSAGE_BSWAP32(m, *(uint32_t*) q);
2767                         if (j >= m->n_fds)
2768                                 return -EBADMSG;
2769
2770                         *(int*) p = m->fds[j];
2771                         break;
2772                 }
2773
2774                 default:
2775                         assert_not_reached("Unknown basic type...");
2776                 }
2777
2778                 m->rindex = rindex;
2779
2780                 break;
2781         }
2782         }
2783
2784         if (c->enclosing != SD_BUS_TYPE_ARRAY)
2785                 c->index++;
2786
2787         return 1;
2788 }
2789
2790 static int bus_message_enter_array(
2791                 sd_bus_message *m,
2792                 struct bus_container *c,
2793                 const char *contents,
2794                 uint32_t **array_size) {
2795
2796         size_t rindex;
2797         void *q;
2798         int r, alignment;
2799
2800         assert(m);
2801         assert(c);
2802         assert(contents);
2803         assert(array_size);
2804
2805         if (!signature_is_single(contents, true))
2806                 return -EINVAL;
2807
2808         alignment = bus_type_get_alignment(contents[0]);
2809         if (alignment < 0)
2810                 return alignment;
2811
2812         if (!c->signature || c->signature[c->index] == 0)
2813                 return 0;
2814
2815         if (c->signature[c->index] != SD_BUS_TYPE_ARRAY)
2816                 return -ENXIO;
2817
2818         if (!startswith(c->signature + c->index + 1, contents))
2819                 return -ENXIO;
2820
2821         rindex = m->rindex;
2822         r = message_peek_body(m, &rindex, 4, 4, &q);
2823         if (r <= 0)
2824                 return r;
2825
2826         if (BUS_MESSAGE_BSWAP32(m, *(uint32_t*) q) > BUS_ARRAY_MAX_SIZE)
2827                 return -EBADMSG;
2828
2829         r = message_peek_body(m, &rindex, alignment, 0, NULL);
2830         if (r < 0)
2831                 return r;
2832         if (r == 0)
2833                 return -EBADMSG;
2834
2835         if (c->enclosing != SD_BUS_TYPE_ARRAY)
2836                 c->index += 1 + strlen(contents);
2837
2838         m->rindex = rindex;
2839
2840         *array_size = (uint32_t*) q;
2841
2842         return 1;
2843 }
2844
2845 static int bus_message_enter_variant(
2846                 sd_bus_message *m,
2847                 struct bus_container *c,
2848                 const char *contents) {
2849
2850         size_t rindex;
2851         uint8_t l;
2852         void *q;
2853         int r;
2854
2855         assert(m);
2856         assert(c);
2857         assert(contents);
2858
2859         if (!signature_is_single(contents, false))
2860                 return -EINVAL;
2861
2862         if (*contents == SD_BUS_TYPE_DICT_ENTRY_BEGIN)
2863                 return -EINVAL;
2864
2865         if (!c->signature || c->signature[c->index] == 0)
2866                 return 0;
2867
2868         if (c->signature[c->index] != SD_BUS_TYPE_VARIANT)
2869                 return -ENXIO;
2870
2871         rindex = m->rindex;
2872         r = message_peek_body(m, &rindex, 1, 1, &q);
2873         if (r <= 0)
2874                 return r;
2875
2876         l = *(uint8_t*) q;
2877         r = message_peek_body(m, &rindex, 1, l+1, &q);
2878         if (r < 0)
2879                 return r;
2880         if (r == 0)
2881                 return -EBADMSG;
2882
2883         if (!validate_signature(q, l))
2884                 return -EBADMSG;
2885
2886         if (!streq(q, contents))
2887                 return -ENXIO;
2888
2889         if (c->enclosing != SD_BUS_TYPE_ARRAY)
2890                 c->index++;
2891
2892         m->rindex = rindex;
2893
2894         return 1;
2895 }
2896
2897 static int bus_message_enter_struct(
2898                 sd_bus_message *m,
2899                 struct bus_container *c,
2900                 const char *contents) {
2901
2902         size_t l;
2903         int r;
2904
2905         assert(m);
2906         assert(c);
2907         assert(contents);
2908
2909         if (!signature_is_valid(contents, false))
2910                 return -EINVAL;
2911
2912         if (!c->signature || c->signature[c->index] == 0)
2913                 return 0;
2914
2915         l = strlen(contents);
2916
2917         if (c->signature[c->index] != SD_BUS_TYPE_STRUCT_BEGIN ||
2918             !startswith(c->signature + c->index + 1, contents) ||
2919             c->signature[c->index + 1 + l] != SD_BUS_TYPE_STRUCT_END)
2920                 return -ENXIO;
2921
2922         r = message_peek_body(m, &m->rindex, 8, 0, NULL);
2923         if (r <= 0)
2924                 return r;
2925
2926         if (c->enclosing != SD_BUS_TYPE_ARRAY)
2927                 c->index += 1 + l + 1;
2928
2929         return 1;
2930 }
2931
2932 static int bus_message_enter_dict_entry(
2933                 sd_bus_message *m,
2934                 struct bus_container *c,
2935                 const char *contents) {
2936
2937         size_t l;
2938         int r;
2939
2940         assert(m);
2941         assert(c);
2942         assert(contents);
2943
2944         if (!signature_is_pair(contents))
2945                 return -EINVAL;
2946
2947         if (c->enclosing != SD_BUS_TYPE_ARRAY)
2948                 return -ENXIO;
2949
2950         if (!c->signature || c->signature[c->index] == 0)
2951                 return 0;
2952
2953         l = strlen(contents);
2954
2955         if (c->signature[c->index] != SD_BUS_TYPE_DICT_ENTRY_BEGIN ||
2956             !startswith(c->signature + c->index + 1, contents) ||
2957             c->signature[c->index + 1 + l] != SD_BUS_TYPE_DICT_ENTRY_END)
2958                 return -ENXIO;
2959
2960         r = message_peek_body(m, &m->rindex, 8, 0, NULL);
2961         if (r <= 0)
2962                 return r;
2963
2964         if (c->enclosing != SD_BUS_TYPE_ARRAY)
2965                 c->index += 1 + l + 1;
2966
2967         return 1;
2968 }
2969
2970 int sd_bus_message_enter_container(sd_bus_message *m, char type, const char *contents) {
2971         struct bus_container *c, *w;
2972         uint32_t *array_size = NULL;
2973         char *signature;
2974         size_t before;
2975         int r;
2976
2977         if (!m)
2978                 return -EINVAL;
2979         if (!m->sealed)
2980                 return -EPERM;
2981         if (!contents)
2982                 return -EINVAL;
2983
2984         /*
2985          * We enforce a global limit on container depth, that is much
2986          * higher than the 32 structs and 32 arrays the specification
2987          * mandates. This is simpler to implement for us, and we need
2988          * this only to ensure our container array doesn't grow
2989          * without bounds. We are happy to return any data from a
2990          * message as long as the data itself is valid, even if the
2991          * overall message might be not.
2992          *
2993          * Note that the message signature is validated when
2994          * parsing the headers, and that validation does check the
2995          * 32/32 limit.
2996          *
2997          * Note that the specification defines no limits on the depth
2998          * of stacked variants, but we do.
2999          */
3000         if (m->n_containers >= BUS_CONTAINER_DEPTH)
3001                 return -EBADMSG;
3002
3003         w = realloc(m->containers, sizeof(struct bus_container) * (m->n_containers + 1));
3004         if (!w)
3005                 return -ENOMEM;
3006         m->containers = w;
3007
3008         c = message_get_container(m);
3009
3010         if (!c->signature || c->signature[c->index] == 0)
3011                 return -ENXIO;
3012
3013         if (message_end_of_array(m, m->rindex))
3014                 return 0;
3015
3016         signature = strdup(contents);
3017         if (!signature)
3018                 return -ENOMEM;
3019
3020         c->saved_index = c->index;
3021         before = m->rindex;
3022
3023         if (type == SD_BUS_TYPE_ARRAY)
3024                 r = bus_message_enter_array(m, c, contents, &array_size);
3025         else if (type == SD_BUS_TYPE_VARIANT)
3026                 r = bus_message_enter_variant(m, c, contents);
3027         else if (type == SD_BUS_TYPE_STRUCT)
3028                 r = bus_message_enter_struct(m, c, contents);
3029         else if (type == SD_BUS_TYPE_DICT_ENTRY)
3030                 r = bus_message_enter_dict_entry(m, c, contents);
3031         else
3032                 r = -EINVAL;
3033
3034         if (r <= 0) {
3035                 free(signature);
3036                 return r;
3037         }
3038
3039         /* OK, let's fill it in */
3040         w += m->n_containers++;
3041         w->enclosing = type;
3042         w->signature = signature;
3043         w->index = 0;
3044         w->array_size = array_size;
3045         w->before = before;
3046         w->begin = m->rindex;
3047
3048         return 1;
3049 }
3050
3051 int sd_bus_message_exit_container(sd_bus_message *m) {
3052         struct bus_container *c;
3053
3054         if (!m)
3055                 return -EINVAL;
3056         if (!m->sealed)
3057                 return -EPERM;
3058         if (m->n_containers <= 0)
3059                 return -EINVAL;
3060
3061         c = message_get_container(m);
3062         if (c->enclosing == SD_BUS_TYPE_ARRAY) {
3063                 uint32_t l;
3064
3065                 l = BUS_MESSAGE_BSWAP32(m, *c->array_size);
3066                 if (c->begin + l != m->rindex)
3067                         return -EBUSY;
3068
3069         } else {
3070                 if (c->signature && c->signature[c->index] != 0)
3071                         return -EINVAL;
3072         }
3073
3074         free(c->signature);
3075         m->n_containers--;
3076
3077         return 1;
3078 }
3079
3080 static void message_quit_container(sd_bus_message *m) {
3081         struct bus_container *c;
3082
3083         assert(m);
3084         assert(m->sealed);
3085         assert(m->n_containers > 0);
3086
3087         c = message_get_container(m);
3088
3089         /* Undo seeks */
3090         assert(m->rindex >= c->before);
3091         m->rindex = c->before;
3092
3093         /* Free container */
3094         free(c->signature);
3095         m->n_containers--;
3096
3097         /* Correct index of new top-level container */
3098         c = message_get_container(m);
3099         c->index = c->saved_index;
3100 }
3101
3102 int sd_bus_message_peek_type(sd_bus_message *m, char *type, const char **contents) {
3103         struct bus_container *c;
3104         int r;
3105
3106         assert_return(m, -EINVAL);
3107         assert_return(m->sealed, -EPERM);
3108
3109         c = message_get_container(m);
3110
3111         if (!c->signature || c->signature[c->index] == 0)
3112                 goto eof;
3113
3114         if (message_end_of_array(m, m->rindex))
3115                 goto eof;
3116
3117         if (bus_type_is_basic(c->signature[c->index])) {
3118                 if (contents)
3119                         *contents = NULL;
3120                 if (type)
3121                         *type = c->signature[c->index];
3122                 return 1;
3123         }
3124
3125         if (c->signature[c->index] == SD_BUS_TYPE_ARRAY) {
3126
3127                 if (contents) {
3128                         size_t l;
3129                         char *sig;
3130
3131                         r = signature_element_length(c->signature+c->index+1, &l);
3132                         if (r < 0)
3133                                 return r;
3134
3135                         assert(l >= 1);
3136
3137                         sig = strndup(c->signature + c->index + 1, l);
3138                         if (!sig)
3139                                 return -ENOMEM;
3140
3141                         free(m->peeked_signature);
3142                         m->peeked_signature = sig;
3143
3144                         *contents = sig;
3145                 }
3146
3147                 if (type)
3148                         *type = SD_BUS_TYPE_ARRAY;
3149
3150                 return 1;
3151         }
3152
3153         if (c->signature[c->index] == SD_BUS_TYPE_STRUCT_BEGIN ||
3154             c->signature[c->index] == SD_BUS_TYPE_DICT_ENTRY_BEGIN) {
3155
3156                 if (contents) {
3157                         size_t l;
3158                         char *sig;
3159
3160                         r = signature_element_length(c->signature+c->index, &l);
3161                         if (r < 0)
3162                                 return r;
3163
3164                         assert(l >= 2);
3165                         sig = strndup(c->signature + c->index + 1, l - 2);
3166                         if (!sig)
3167                                 return -ENOMEM;
3168
3169                         free(m->peeked_signature);
3170                         m->peeked_signature = sig;
3171
3172                         *contents = sig;
3173                 }
3174
3175                 if (type)
3176                         *type = c->signature[c->index] == SD_BUS_TYPE_STRUCT_BEGIN ? SD_BUS_TYPE_STRUCT : SD_BUS_TYPE_DICT_ENTRY;
3177
3178                 return 1;
3179         }
3180
3181         if (c->signature[c->index] == SD_BUS_TYPE_VARIANT) {
3182                 if (contents) {
3183                         size_t rindex, l;
3184                         void *q;
3185
3186                         rindex = m->rindex;
3187                         r = message_peek_body(m, &rindex, 1, 1, &q);
3188                         if (r < 0)
3189                                 return r;
3190                         if (r == 0)
3191                                 goto eof;
3192
3193                         l = *(uint8_t*) q;
3194                         r = message_peek_body(m, &rindex, 1, l+1, &q);
3195                         if (r < 0)
3196                                 return r;
3197                         if (r == 0)
3198                                 return -EBADMSG;
3199
3200                         if (!validate_signature(q, l))
3201                                 return -EBADMSG;
3202
3203                         *contents = q;
3204                 }
3205
3206                 if (type)
3207                         *type = SD_BUS_TYPE_VARIANT;
3208
3209                 return 1;
3210         }
3211
3212         return -EINVAL;
3213
3214 eof:
3215         if (type)
3216                 *type = c->enclosing;
3217         if (contents)
3218                 *contents = NULL;
3219         return 0;
3220 }
3221
3222 int sd_bus_message_rewind(sd_bus_message *m, int complete) {
3223         struct bus_container *c;
3224
3225         if (!m)
3226                 return -EINVAL;
3227         if (!m->sealed)
3228                 return -EPERM;
3229
3230         if (complete) {
3231                 message_reset_containers(m);
3232                 m->rindex = 0;
3233                 m->root_container.index = 0;
3234
3235                 c = message_get_container(m);
3236         } else {
3237                 c = message_get_container(m);
3238
3239                 c->index = 0;
3240                 m->rindex = c->begin;
3241         }
3242
3243         return !isempty(c->signature);
3244 }
3245 static int message_read_ap(
3246                 sd_bus_message *m,
3247                 const char *types,
3248                 va_list ap) {
3249
3250         unsigned n_array, n_struct;
3251         TypeStack stack[BUS_CONTAINER_DEPTH];
3252         unsigned stack_ptr = 0;
3253         unsigned n_loop = 0;
3254         int r;
3255
3256         assert(m);
3257
3258         if (isempty(types))
3259                 return 0;
3260
3261         /* Ideally, we'd just call ourselves recursively on every
3262          * complex type. However, the state of a va_list that is
3263          * passed to a function is undefined after that function
3264          * returns. This means we need to docode the va_list linearly
3265          * in a single stackframe. We hence implement our own
3266          * home-grown stack in an array. */
3267
3268         n_array = (unsigned) -1; /* lenght of current array entries */
3269         n_struct = strlen(types); /* length of current struct contents signature */
3270
3271         for (;;) {
3272                 const char *t;
3273
3274                 n_loop++;
3275
3276                 if (n_array == 0 || (n_array == (unsigned) -1 && n_struct == 0)) {
3277                         r = type_stack_pop(stack, ELEMENTSOF(stack), &stack_ptr, &types, &n_struct, &n_array);
3278                         if (r < 0)
3279                                 return r;
3280                         if (r == 0)
3281                                 break;
3282
3283                         r = sd_bus_message_exit_container(m);
3284                         if (r < 0)
3285                                 return r;
3286
3287                         continue;
3288                 }
3289
3290                 t = types;
3291                 if (n_array != (unsigned) -1)
3292                         n_array --;
3293                 else {
3294                         types ++;
3295                         n_struct--;
3296                 }
3297
3298                 switch (*t) {
3299
3300                 case SD_BUS_TYPE_BYTE:
3301                 case SD_BUS_TYPE_BOOLEAN:
3302                 case SD_BUS_TYPE_INT16:
3303                 case SD_BUS_TYPE_UINT16:
3304                 case SD_BUS_TYPE_INT32:
3305                 case SD_BUS_TYPE_UINT32:
3306                 case SD_BUS_TYPE_INT64:
3307                 case SD_BUS_TYPE_UINT64:
3308                 case SD_BUS_TYPE_DOUBLE:
3309                 case SD_BUS_TYPE_STRING:
3310                 case SD_BUS_TYPE_OBJECT_PATH:
3311                 case SD_BUS_TYPE_SIGNATURE:
3312                 case SD_BUS_TYPE_UNIX_FD: {
3313                         void *p;
3314
3315                         p = va_arg(ap, void*);
3316                         r = sd_bus_message_read_basic(m, *t, p);
3317                         if (r < 0)
3318                                 return r;
3319
3320                         if (r == 0) {
3321                                 if (n_loop <= 1)
3322                                         return 0;
3323
3324                                 return -ENXIO;
3325                         }
3326
3327                         break;
3328                 }
3329
3330                 case SD_BUS_TYPE_ARRAY: {
3331                         size_t k;
3332
3333                         r = signature_element_length(t + 1, &k);
3334                         if (r < 0)
3335                                 return r;
3336
3337                         {
3338                                 char s[k + 1];
3339                                 memcpy(s, t + 1, k);
3340                                 s[k] = 0;
3341
3342                                 r = sd_bus_message_enter_container(m, SD_BUS_TYPE_ARRAY, s);
3343                                 if (r < 0)
3344                                         return r;
3345                                 if (r == 0) {
3346                                         if (n_loop <= 1)
3347                                                 return 0;
3348
3349                                         return -ENXIO;
3350                                 }
3351                         }
3352
3353                         if (n_array == (unsigned) -1) {
3354                                 types += k;
3355                                 n_struct -= k;
3356                         }
3357
3358                         r = type_stack_push(stack, ELEMENTSOF(stack), &stack_ptr, types, n_struct, n_array);
3359                         if (r < 0)
3360                                 return r;
3361
3362                         types = t + 1;
3363                         n_struct = k;
3364                         n_array = va_arg(ap, unsigned);
3365
3366                         break;
3367                 }
3368
3369                 case SD_BUS_TYPE_VARIANT: {
3370                         const char *s;
3371
3372                         s = va_arg(ap, const char *);
3373                         if (!s)
3374                                 return -EINVAL;
3375
3376                         r = sd_bus_message_enter_container(m, SD_BUS_TYPE_VARIANT, s);
3377                         if (r < 0)
3378                                 return r;
3379                         if (r == 0) {
3380                                 if (n_loop <= 1)
3381                                         return 0;
3382
3383                                 return -ENXIO;
3384                         }
3385
3386                         r = type_stack_push(stack, ELEMENTSOF(stack), &stack_ptr, types, n_struct, n_array);
3387                         if (r < 0)
3388                                 return r;
3389
3390                         types = s;
3391                         n_struct = strlen(s);
3392                         n_array = (unsigned) -1;
3393
3394                         break;
3395                 }
3396
3397                 case SD_BUS_TYPE_STRUCT_BEGIN:
3398                 case SD_BUS_TYPE_DICT_ENTRY_BEGIN: {
3399                         size_t k;
3400
3401                         r = signature_element_length(t, &k);
3402                         if (r < 0)
3403                                 return r;
3404
3405                         {
3406                                 char s[k - 1];
3407                                 memcpy(s, t + 1, k - 2);
3408                                 s[k - 2] = 0;
3409
3410                                 r = sd_bus_message_enter_container(m, *t == SD_BUS_TYPE_STRUCT_BEGIN ? SD_BUS_TYPE_STRUCT : SD_BUS_TYPE_DICT_ENTRY, s);
3411                                 if (r < 0)
3412                                         return r;
3413                                 if (r == 0) {
3414                                         if (n_loop <= 1)
3415                                                 return 0;
3416                                         return -ENXIO;
3417                                 }
3418                         }
3419
3420                         if (n_array == (unsigned) -1) {
3421                                 types += k - 1;
3422                                 n_struct -= k - 1;
3423                         }
3424
3425                         r = type_stack_push(stack, ELEMENTSOF(stack), &stack_ptr, types, n_struct, n_array);
3426                         if (r < 0)
3427                                 return r;
3428
3429                         types = t + 1;
3430                         n_struct = k - 2;
3431                         n_array = (unsigned) -1;
3432
3433                         break;
3434                 }
3435
3436                 default:
3437                         return -EINVAL;
3438                 }
3439         }
3440
3441         return 1;
3442 }
3443
3444 int sd_bus_message_read(sd_bus_message *m, const char *types, ...) {
3445         va_list ap;
3446         int r;
3447
3448         if (!m)
3449                 return -EINVAL;
3450         if (!m->sealed)
3451                 return -EPERM;
3452         if (!types)
3453                 return -EINVAL;
3454
3455         va_start(ap, types);
3456         r = message_read_ap(m, types, ap);
3457         va_end(ap);
3458
3459         return r;
3460 }
3461
3462 int sd_bus_message_read_array(sd_bus_message *m, char type, const void **ptr, size_t *size) {
3463         struct bus_container *c;
3464         void *p;
3465         size_t sz;
3466         ssize_t align;
3467         int r;
3468
3469         if (!m)
3470                 return -EINVAL;
3471         if (!m->sealed)
3472                 return -EPERM;
3473         if (!bus_type_is_trivial(type))
3474                 return -EINVAL;
3475         if (!ptr)
3476                 return -EINVAL;
3477         if (!size)
3478                 return -EINVAL;
3479         if (BUS_MESSAGE_NEED_BSWAP(m))
3480                 return -ENOTSUP;
3481
3482         align = bus_type_get_alignment(type);
3483         if (align < 0)
3484                 return align;
3485
3486         r = sd_bus_message_enter_container(m, SD_BUS_TYPE_ARRAY, CHAR_TO_STR(type));
3487         if (r <= 0)
3488                 return r;
3489
3490         c = message_get_container(m);
3491         sz = BUS_MESSAGE_BSWAP32(m, *c->array_size);
3492
3493         r = message_peek_body(m, &m->rindex, align, sz, &p);
3494         if (r < 0)
3495                 goto fail;
3496         if (r == 0) {
3497                 r = -EBADMSG;
3498                 goto fail;
3499         }
3500
3501         r = sd_bus_message_exit_container(m);
3502         if (r < 0)
3503                 goto fail;
3504
3505         *ptr = (const void*) p;
3506         *size = sz;
3507
3508         return 1;
3509
3510 fail:
3511         message_quit_container(m);
3512         return r;
3513 }
3514
3515 static int message_peek_fields(
3516                 sd_bus_message *m,
3517                 size_t *rindex,
3518                 size_t align,
3519                 size_t nbytes,
3520                 void **ret) {
3521
3522         assert(m);
3523         assert(rindex);
3524         assert(align > 0);
3525
3526         return buffer_peek(BUS_MESSAGE_FIELDS(m), BUS_MESSAGE_FIELDS_SIZE(m), rindex, align, nbytes, ret);
3527 }
3528
3529 static int message_peek_field_uint32(
3530                 sd_bus_message *m,
3531                 size_t *ri,
3532                 uint32_t *ret) {
3533
3534         int r;
3535         void *q;
3536
3537         assert(m);
3538         assert(ri);
3539
3540         r = message_peek_fields(m, ri, 4, 4, &q);
3541         if (r < 0)
3542                 return r;
3543
3544         if (ret)
3545                 *ret = BUS_MESSAGE_BSWAP32(m, *(uint32_t*) q);
3546
3547         return 0;
3548 }
3549
3550 static int message_peek_field_string(
3551                 sd_bus_message *m,
3552                 bool (*validate)(const char *p),
3553                 size_t *ri,
3554                 const char **ret) {
3555
3556         uint32_t l;
3557         int r;
3558         void *q;
3559
3560         assert(m);
3561         assert(ri);
3562
3563         r = message_peek_field_uint32(m, ri, &l);
3564         if (r < 0)
3565                 return r;
3566
3567         r = message_peek_fields(m, ri, 1, l+1, &q);
3568         if (r < 0)
3569                 return r;
3570
3571         if (validate) {
3572                 if (!validate_nul(q, l))
3573                         return -EBADMSG;
3574
3575                 if (!validate(q))
3576                         return -EBADMSG;
3577         } else {
3578                 if (!validate_string(q, l))
3579                         return -EBADMSG;
3580         }
3581
3582         if (ret)
3583                 *ret = q;
3584
3585         return 0;
3586 }
3587
3588 static int message_peek_field_signature(
3589                 sd_bus_message *m,
3590                 size_t *ri,
3591                 const char **ret) {
3592
3593         size_t l;
3594         int r;
3595         void *q;
3596
3597         assert(m);
3598         assert(ri);
3599
3600         r = message_peek_fields(m, ri, 1, 1, &q);
3601         if (r < 0)
3602                 return r;
3603
3604         l = *(uint8_t*) q;
3605         r = message_peek_fields(m, ri, 1, l+1, &q);
3606         if (r < 0)
3607                 return r;
3608
3609         if (!validate_signature(q, l))
3610                 return -EBADMSG;
3611
3612         if (ret)
3613                 *ret = q;
3614
3615         return 0;
3616 }
3617
3618 static int message_skip_fields(
3619                 sd_bus_message *m,
3620                 size_t *ri,
3621                 uint32_t array_size,
3622                 const char **signature) {
3623
3624         size_t original_index;
3625         int r;
3626
3627         assert(m);
3628         assert(ri);
3629         assert(signature);
3630
3631         original_index = *ri;
3632
3633         for (;;) {
3634                 char t;
3635                 size_t l;
3636
3637                 if (array_size != (uint32_t) -1 &&
3638                     array_size <= *ri - original_index)
3639                         return 0;
3640
3641                 t = **signature;
3642                 if (!t)
3643                         return 0;
3644
3645                 if (t == SD_BUS_TYPE_STRING) {
3646
3647                         r = message_peek_field_string(m, NULL, ri, NULL);
3648                         if (r < 0)
3649                                 return r;
3650
3651                         (*signature)++;
3652
3653                 } else if (t == SD_BUS_TYPE_OBJECT_PATH) {
3654
3655                         r = message_peek_field_string(m, object_path_is_valid, ri, NULL);
3656                         if (r < 0)
3657                                 return r;
3658
3659                         (*signature)++;
3660
3661                 } else if (t == SD_BUS_TYPE_SIGNATURE) {
3662
3663                         r = message_peek_field_signature(m, ri, NULL);
3664                         if (r < 0)
3665                                 return r;
3666
3667                         (*signature)++;
3668
3669                 } else if (bus_type_is_basic(t)) {
3670                         ssize_t align, k;
3671
3672                         align = bus_type_get_alignment(t);
3673                         k = bus_type_get_size(t);
3674                         assert(align > 0 && k > 0);
3675
3676                         r = message_peek_fields(m, ri, align, k, NULL);
3677                         if (r < 0)
3678                                 return r;
3679
3680                         (*signature)++;
3681
3682                 } else if (t == SD_BUS_TYPE_ARRAY) {
3683
3684                         r = signature_element_length(*signature+1, &l);
3685                         if (r < 0)
3686                                 return r;
3687
3688                         assert(l >= 1);
3689                         {
3690                                 char sig[l-1], *s;
3691                                 uint32_t nas;
3692                                 int alignment;
3693
3694                                 strncpy(sig, *signature + 1, l-1);
3695                                 s = sig;
3696
3697                                 alignment = bus_type_get_alignment(sig[0]);
3698                                 if (alignment < 0)
3699                                         return alignment;
3700
3701                                 r = message_peek_field_uint32(m, ri, &nas);
3702                                 if (r < 0)
3703                                         return r;
3704                                 if (nas > BUS_ARRAY_MAX_SIZE)
3705                                         return -EBADMSG;
3706
3707                                 r = message_peek_fields(m, ri, alignment, 0, NULL);
3708                                 if (r < 0)
3709                                         return r;
3710
3711                                 r = message_skip_fields(m, ri, nas, (const char**) &s);
3712                                 if (r < 0)
3713                                         return r;
3714                         }
3715
3716                         (*signature) += 1 + l;
3717
3718                 } else if (t == SD_BUS_TYPE_VARIANT) {
3719                         const char *s;
3720
3721                         r = message_peek_field_signature(m, ri, &s);
3722                         if (r < 0)
3723                                 return r;
3724
3725                         r = message_skip_fields(m, ri, (uint32_t) -1, (const char**) &s);
3726                         if (r < 0)
3727                                 return r;
3728
3729                         (*signature)++;
3730
3731                 } else if (t == SD_BUS_TYPE_STRUCT ||
3732                            t == SD_BUS_TYPE_DICT_ENTRY) {
3733
3734                         r = signature_element_length(*signature, &l);
3735                         if (r < 0)
3736                                 return r;
3737
3738                         assert(l >= 2);
3739                         {
3740                                 char sig[l-1], *s;
3741                                 strncpy(sig, *signature + 1, l-1);
3742                                 s = sig;
3743
3744                                 r = message_skip_fields(m, ri, (uint32_t) -1, (const char**) &s);
3745                                 if (r < 0)
3746                                         return r;
3747                         }
3748
3749                         *signature += l;
3750                 } else
3751                         return -EINVAL;
3752         }
3753 }
3754
3755 int bus_message_parse_fields(sd_bus_message *m) {
3756         size_t ri;
3757         int r;
3758         uint32_t unix_fds = 0;
3759
3760         assert(m);
3761
3762         for (ri = 0; ri < BUS_MESSAGE_FIELDS_SIZE(m); ) {
3763                 const char *signature;
3764                 uint8_t *header;
3765
3766                 r = message_peek_fields(m, &ri, 8, 1, (void**) &header);
3767                 if (r < 0)
3768                         return r;
3769
3770                 r = message_peek_field_signature(m, &ri, &signature);
3771                 if (r < 0)
3772                         return r;
3773
3774                 switch (*header) {
3775                 case _SD_BUS_MESSAGE_HEADER_INVALID:
3776                         return -EBADMSG;
3777
3778                 case SD_BUS_MESSAGE_HEADER_PATH:
3779
3780                         if (m->path)
3781                                 return -EBADMSG;
3782
3783                         if (!streq(signature, "o"))
3784                                 return -EBADMSG;
3785
3786                         r = message_peek_field_string(m, object_path_is_valid, &ri, &m->path);
3787                         break;
3788
3789                 case SD_BUS_MESSAGE_HEADER_INTERFACE:
3790
3791                         if (m->interface)
3792                                 return -EBADMSG;
3793
3794                         if (!streq(signature, "s"))
3795                                 return -EBADMSG;
3796
3797                         r = message_peek_field_string(m, interface_name_is_valid, &ri, &m->interface);
3798                         break;
3799
3800                 case SD_BUS_MESSAGE_HEADER_MEMBER:
3801
3802                         if (m->member)
3803                                 return -EBADMSG;
3804
3805                         if (!streq(signature, "s"))
3806                                 return -EBADMSG;
3807
3808                         r = message_peek_field_string(m, member_name_is_valid, &ri, &m->member);
3809                         break;
3810
3811                 case SD_BUS_MESSAGE_HEADER_ERROR_NAME:
3812
3813                         if (m->error.name)
3814                                 return -EBADMSG;
3815
3816                         if (!streq(signature, "s"))
3817                                 return -EBADMSG;
3818
3819                         r = message_peek_field_string(m, error_name_is_valid, &ri, &m->error.name);
3820                         break;
3821
3822                 case SD_BUS_MESSAGE_HEADER_DESTINATION:
3823
3824                         if (m->destination)
3825                                 return -EBADMSG;
3826
3827                         if (!streq(signature, "s"))
3828                                 return -EBADMSG;
3829
3830                         r = message_peek_field_string(m, service_name_is_valid, &ri, &m->destination);
3831                         break;
3832
3833                 case SD_BUS_MESSAGE_HEADER_SENDER:
3834
3835                         if (m->sender)
3836                                 return -EBADMSG;
3837
3838                         if (!streq(signature, "s"))
3839                                 return -EBADMSG;
3840
3841                         r = message_peek_field_string(m, service_name_is_valid, &ri, &m->sender);
3842                         break;
3843
3844
3845                 case SD_BUS_MESSAGE_HEADER_SIGNATURE: {
3846                         const char *s;
3847                         char *c;
3848
3849                         if (m->root_container.signature)
3850                                 return -EBADMSG;
3851
3852                         if (!streq(signature, "g"))
3853                                 return -EBADMSG;
3854
3855                         r = message_peek_field_signature(m, &ri, &s);
3856                         if (r < 0)
3857                                 return r;
3858
3859                         c = strdup(s);
3860                         if (!c)
3861                                 return -ENOMEM;
3862
3863                         free(m->root_container.signature);
3864                         m->root_container.signature = c;
3865                         break;
3866                 }
3867
3868                 case SD_BUS_MESSAGE_HEADER_REPLY_SERIAL:
3869                         if (m->reply_serial != 0)
3870                                 return -EBADMSG;
3871
3872                         if (!streq(signature, "u"))
3873                                 return -EBADMSG;
3874
3875                         r = message_peek_field_uint32(m, &ri, &m->reply_serial);
3876                         if (r < 0)
3877                                 return r;
3878
3879                         if (m->reply_serial == 0)
3880                                 return -EBADMSG;
3881
3882                         break;
3883
3884                 case SD_BUS_MESSAGE_HEADER_UNIX_FDS:
3885                         if (unix_fds != 0)
3886                                 return -EBADMSG;
3887
3888                         if (!streq(signature, "u"))
3889                                 return -EBADMSG;
3890
3891                         r = message_peek_field_uint32(m, &ri, &unix_fds);
3892                         if (r < 0)
3893                                 return -EBADMSG;
3894
3895                         if (unix_fds == 0)
3896                                 return -EBADMSG;
3897
3898                         break;
3899
3900                 default:
3901                         r = message_skip_fields(m, &ri, (uint32_t) -1, (const char **) &signature);
3902                 }
3903
3904                 if (r < 0)
3905                         return r;
3906         }
3907
3908         if (m->n_fds != unix_fds)
3909                 return -EBADMSG;
3910
3911         if (isempty(m->root_container.signature) != (BUS_MESSAGE_BODY_SIZE(m) == 0))
3912                 return -EBADMSG;
3913
3914         switch (m->header->type) {
3915
3916         case SD_BUS_MESSAGE_SIGNAL:
3917                 if (!m->path || !m->interface || !m->member)
3918                         return -EBADMSG;
3919                 break;
3920
3921         case SD_BUS_MESSAGE_METHOD_CALL:
3922
3923                 if (!m->path || !m->member)
3924                         return -EBADMSG;
3925
3926                 break;
3927
3928         case SD_BUS_MESSAGE_METHOD_RETURN:
3929
3930                 if (m->reply_serial == 0)
3931                         return -EBADMSG;
3932                 break;
3933
3934         case SD_BUS_MESSAGE_METHOD_ERROR:
3935
3936                 if (m->reply_serial == 0 || !m->error.name)
3937                         return -EBADMSG;
3938                 break;
3939         }
3940
3941         /* Try to read the error message, but if we can't it's a non-issue */
3942         if (m->header->type == SD_BUS_MESSAGE_METHOD_ERROR)
3943                 sd_bus_message_read(m, "s", &m->error.message);
3944
3945         return 0;
3946 }
3947
3948 int bus_message_seal(sd_bus_message *m, uint64_t serial) {
3949         struct bus_body_part *part;
3950         size_t l, a;
3951         unsigned i;
3952         int r;
3953
3954         assert(m);
3955
3956         if (m->sealed)
3957                 return -EPERM;
3958
3959         if (m->n_containers > 0)
3960                 return -EBADMSG;
3961
3962         if (m->poisoned)
3963                 return -ESTALE;
3964
3965         /* If there's a non-trivial signature set, then add it in here */
3966         if (!isempty(m->root_container.signature)) {
3967                 r = message_append_field_signature(m, SD_BUS_MESSAGE_HEADER_SIGNATURE, m->root_container.signature, NULL);
3968                 if (r < 0)
3969                         return r;
3970         }
3971
3972         if (m->n_fds > 0) {
3973                 r = message_append_field_uint32(m, SD_BUS_MESSAGE_HEADER_UNIX_FDS, m->n_fds);
3974                 if (r < 0)
3975                         return r;
3976         }
3977
3978         /* Add padding at the end of the fields part, since we know
3979          * the body needs to start at an 8 byte alignment. We made
3980          * sure we allocated enough space for this, so all we need to
3981          * do here is to zero it out. */
3982         l = BUS_MESSAGE_FIELDS_SIZE(m);
3983         a = ALIGN8(l) - l;
3984         if (a > 0)
3985                 memset((uint8_t*) BUS_MESSAGE_FIELDS(m) + l, 0, a);
3986
3987         /* If this is something we can send as memfd, then let's seal
3988         the memfd now. Note that we can send memfds as payload only
3989         for directed messages, and not for broadcasts. */
3990         if (m->destination && m->bus && m->bus->use_memfd) {
3991                 MESSAGE_FOREACH_PART(part, i, m)
3992                         if (part->memfd >= 0 && !part->sealed && (part->size > MEMFD_MIN_SIZE || m->bus->use_memfd < 0)) {
3993                                 bus_body_part_unmap(part);
3994
3995                                 if (ioctl(part->memfd, KDBUS_CMD_MEMFD_SEAL_SET, 1) >= 0)
3996                                         part->sealed = true;
3997                         }
3998         }
3999
4000         m->header->serial = serial;
4001         m->sealed = true;
4002
4003         return 0;
4004 }
4005
4006 int sd_bus_message_set_destination(sd_bus_message *m, const char *destination) {
4007         if (!m)
4008                 return -EINVAL;
4009         if (!destination)
4010                 return -EINVAL;
4011         if (m->sealed)
4012                 return -EPERM;
4013         if (m->destination)
4014                 return -EEXIST;
4015
4016         return message_append_field_string(m, SD_BUS_MESSAGE_HEADER_DESTINATION, SD_BUS_TYPE_STRING, destination, &m->destination);
4017 }
4018
4019 int bus_message_dump(sd_bus_message *m, FILE *f, bool with_header) {
4020         const char *u = NULL, *uu = NULL, *s = NULL;
4021         char **cmdline = NULL;
4022         unsigned level = 1;
4023         int r;
4024         uid_t owner, audit_loginuid;
4025         uint32_t audit_sessionid;
4026
4027         assert(m);
4028
4029         if (!f)
4030                 f = stdout;
4031
4032         if (with_header) {
4033                 fprintf(f,
4034                         "Message %p\n"
4035                         "\tn_ref=%u\n"
4036                         "\tendian=%c\n"
4037                         "\ttype=%i\n"
4038                         "\tflags=%u\n"
4039                         "\tversion=%u\n"
4040                         "\tserial=%u\n"
4041                         "\tfields_size=%u\n"
4042                         "\tbody_size=%u\n"
4043                         "\tpath=%s\n"
4044                         "\tinterface=%s\n"
4045                         "\tmember=%s\n"
4046                         "\tdestination=%s\n"
4047                         "\tsender=%s\n"
4048                         "\tsignature=%s\n"
4049                         "\treply_serial=%u\n"
4050                         "\terror.name=%s\n"
4051                         "\terror.message=%s\n"
4052                         "\tsealed=%s\n"
4053                         "\tn_body_parts=%u\n",
4054                         m,
4055                         m->n_ref,
4056                         m->header->endian,
4057                         m->header->type,
4058                         m->header->flags,
4059                         m->header->version,
4060                         BUS_MESSAGE_SERIAL(m),
4061                         BUS_MESSAGE_FIELDS_SIZE(m),
4062                         BUS_MESSAGE_BODY_SIZE(m),
4063                         strna(m->path),
4064                         strna(m->interface),
4065                         strna(m->member),
4066                         strna(m->destination),
4067                         strna(m->sender),
4068                         strna(m->root_container.signature),
4069                         m->reply_serial,
4070                         strna(m->error.name),
4071                         strna(m->error.message),
4072                         yes_no(m->sealed),
4073                         m->n_body_parts);
4074
4075                 if (m->pid != 0)
4076                         fprintf(f, "\tpid=%lu\n", (unsigned long) m->pid);
4077                 if (m->tid != 0)
4078                         fprintf(f, "\ttid=%lu\n", (unsigned long) m->tid);
4079                 if (m->uid_valid)
4080                         fprintf(f, "\tuid=%lu\n", (unsigned long) m->uid);
4081                 if (m->gid_valid)
4082                         fprintf(f, "\tgid=%lu\n", (unsigned long) m->gid);
4083                 if (m->pid_starttime != 0)
4084                         fprintf(f, "\tpid_starttime=%llu\n", (unsigned long long) m->pid_starttime);
4085                 if (m->monotonic != 0)
4086                         fprintf(f, "\tmonotonic=%llu\n", (unsigned long long) m->monotonic);
4087                 if (m->realtime != 0)
4088                         fprintf(f, "\trealtime=%llu\n", (unsigned long long) m->realtime);
4089                 if (m->exe)
4090                         fprintf(f, "\texe=[%s]\n", m->exe);
4091                 if (m->comm)
4092                         fprintf(f, "\tcomm=[%s]\n", m->comm);
4093                 if (m->tid_comm)
4094                         fprintf(f, "\ttid_comm=[%s]\n", m->tid_comm);
4095                 if (m->label)
4096                         fprintf(f, "\tlabel=[%s]\n", m->label);
4097                 if (m->cgroup)
4098                         fprintf(f, "\tcgroup=[%s]\n", m->cgroup);
4099
4100                 sd_bus_message_get_unit(m, &u);
4101                 if (u)
4102                         fprintf(f, "\tunit=[%s]\n", u);
4103                 sd_bus_message_get_user_unit(m, &uu);
4104                 if (uu)
4105                         fprintf(f, "\tuser_unit=[%s]\n", uu);
4106                 sd_bus_message_get_session(m, &s);
4107                 if (s)
4108                         fprintf(f, "\tsession=[%s]\n", s);
4109                 if (sd_bus_message_get_owner_uid(m, &owner) >= 0)
4110                         fprintf(f, "\towner_uid=%lu\n", (unsigned long) owner);
4111                 if (sd_bus_message_get_audit_loginuid(m, &audit_loginuid) >= 0)
4112                         fprintf(f, "\taudit_loginuid=%lu\n", (unsigned long) audit_loginuid);
4113                 if (sd_bus_message_get_audit_sessionid(m, &audit_sessionid) >= 0)
4114                         fprintf(f, "\taudit_sessionid=%lu\n", (unsigned long) audit_sessionid);
4115
4116                 fprintf(f, "\tCAP_KILL=%i\n", sd_bus_message_has_effective_cap(m, 5));
4117
4118                 if (sd_bus_message_get_cmdline(m, &cmdline) >= 0) {
4119                         char **c;
4120
4121                         fputs("\tcmdline=[", f);
4122                         STRV_FOREACH(c, cmdline) {
4123                                 if (c != cmdline)
4124                                         fputc(' ', f);
4125
4126                                 fputs(*c, f);
4127                         }
4128
4129                         fputs("]\n", f);
4130                 }
4131         }
4132
4133         r = sd_bus_message_rewind(m, true);
4134         if (r < 0) {
4135                 log_error("Failed to rewind: %s", strerror(-r));
4136                 return r;
4137         }
4138
4139         fprintf(f, "BEGIN_MESSAGE \"%s\" {\n", strempty(m->root_container.signature));
4140
4141         for(;;) {
4142                 _cleanup_free_ char *prefix = NULL;
4143                 const char *contents = NULL;
4144                 char type;
4145                 union {
4146                         uint8_t u8;
4147                         uint16_t u16;
4148                         int16_t s16;
4149                         uint32_t u32;
4150                         int32_t s32;
4151                         uint64_t u64;
4152                         int64_t s64;
4153                         double d64;
4154                         const char *string;
4155                         int i;
4156                 } basic;
4157
4158                 r = sd_bus_message_peek_type(m, &type, &contents);
4159                 if (r < 0) {
4160                         log_error("Failed to peek type: %s", strerror(-r));
4161                         return r;
4162                 }
4163                 if (r == 0) {
4164                         if (level <= 1)
4165                                 break;
4166
4167                         r = sd_bus_message_exit_container(m);
4168                         if (r < 0) {
4169                                 log_error("Failed to exit container: %s", strerror(-r));
4170                                 return r;
4171                         }
4172
4173                         level--;
4174
4175                         prefix = strrep("\t", level);
4176                         if (!prefix)
4177                                 return log_oom();
4178
4179                         if (type == SD_BUS_TYPE_ARRAY)
4180                                 fprintf(f, "%s} END_ARRAY \n", prefix);
4181                         else if (type == SD_BUS_TYPE_VARIANT)
4182                                 fprintf(f, "%s} END_VARIANT\n", prefix);
4183                         else if (type == SD_BUS_TYPE_STRUCT)
4184                                 fprintf(f, "%s} END_STRUCT\n", prefix);
4185                         else if (type == SD_BUS_TYPE_DICT_ENTRY)
4186                                 fprintf(f, "%s} END_DICT_ENTRY\n", prefix);
4187
4188                         continue;
4189                 }
4190
4191                 prefix = strrep("\t", level);
4192                 if (!prefix)
4193                         return log_oom();
4194
4195                 if (bus_type_is_container(type) > 0) {
4196                         r = sd_bus_message_enter_container(m, type, contents);
4197                         if (r < 0) {
4198                                 log_error("Failed to enter container: %s", strerror(-r));
4199                                 return r;
4200                         }
4201
4202                         if (type == SD_BUS_TYPE_ARRAY)
4203                                 fprintf(f, "%sBEGIN_ARRAY \"%s\" {\n", prefix, contents);
4204                         else if (type == SD_BUS_TYPE_VARIANT)
4205                                 fprintf(f, "%sBEGIN_VARIANT \"%s\" {\n", prefix, contents);
4206                         else if (type == SD_BUS_TYPE_STRUCT)
4207                                 fprintf(f, "%sBEGIN_STRUCT \"%s\" {\n", prefix, contents);
4208                         else if (type == SD_BUS_TYPE_DICT_ENTRY)
4209                                 fprintf(f, "%sBEGIN_DICT_ENTRY \"%s\" {\n", prefix, contents);
4210
4211                         level ++;
4212
4213                         continue;
4214                 }
4215
4216                 r = sd_bus_message_read_basic(m, type, &basic);
4217                 if (r < 0) {
4218                         log_error("Failed to get basic: %s", strerror(-r));
4219                         return r;
4220                 }
4221
4222                 assert(r > 0);
4223
4224                 switch (type) {
4225
4226                 case SD_BUS_TYPE_BYTE:
4227                         fprintf(f, "%sBYTE: %u\n", prefix, basic.u8);
4228                         break;
4229
4230                 case SD_BUS_TYPE_BOOLEAN:
4231                         fprintf(f, "%sBOOLEAN: %s\n", prefix, yes_no(basic.i));
4232                         break;
4233
4234                 case SD_BUS_TYPE_INT16:
4235                         fprintf(f, "%sINT16: %i\n", prefix, basic.s16);
4236                         break;
4237
4238                 case SD_BUS_TYPE_UINT16:
4239                         fprintf(f, "%sUINT16: %u\n", prefix, basic.u16);
4240                         break;
4241
4242                 case SD_BUS_TYPE_INT32:
4243                         fprintf(f, "%sINT32: %i\n", prefix, basic.s32);
4244                         break;
4245
4246                 case SD_BUS_TYPE_UINT32:
4247                         fprintf(f, "%sUINT32: %u\n", prefix, basic.u32);
4248                         break;
4249
4250                 case SD_BUS_TYPE_INT64:
4251                         fprintf(f, "%sINT64: %lli\n", prefix, (long long) basic.s64);
4252                         break;
4253
4254                 case SD_BUS_TYPE_UINT64:
4255                         fprintf(f, "%sUINT64: %llu\n", prefix, (unsigned long long) basic.u64);
4256                         break;
4257
4258                 case SD_BUS_TYPE_DOUBLE:
4259                         fprintf(f, "%sDOUBLE: %g\n", prefix, basic.d64);
4260                         break;
4261
4262                 case SD_BUS_TYPE_STRING:
4263                         fprintf(f, "%sSTRING: \"%s\"\n", prefix, basic.string);
4264                         break;
4265
4266                 case SD_BUS_TYPE_OBJECT_PATH:
4267                         fprintf(f, "%sOBJECT_PATH: \"%s\"\n", prefix, basic.string);
4268                         break;
4269
4270                 case SD_BUS_TYPE_SIGNATURE:
4271                         fprintf(f, "%sSIGNATURE: \"%s\"\n", prefix, basic.string);
4272                         break;
4273
4274                 case SD_BUS_TYPE_UNIX_FD:
4275                         fprintf(f, "%sUNIX_FD: %i\n", prefix, basic.i);
4276                         break;
4277
4278                 default:
4279                         assert_not_reached("Unknown basic type.");
4280                 }
4281         }
4282
4283         fprintf(f, "} END_MESSAGE\n");
4284         return 0;
4285 }
4286
4287 int bus_message_get_blob(sd_bus_message *m, void **buffer, size_t *sz) {
4288         size_t total;
4289         void *p, *e;
4290         unsigned i;
4291         struct bus_body_part *part;
4292
4293         assert(m);
4294         assert(buffer);
4295         assert(sz);
4296
4297         total = BUS_MESSAGE_SIZE(m);
4298
4299         p = malloc(total);
4300         if (!p)
4301                 return -ENOMEM;
4302
4303         e = mempcpy(p, m->header, BUS_MESSAGE_BODY_BEGIN(m));
4304         MESSAGE_FOREACH_PART(part, i, m)
4305                 e = mempcpy(e, part->data, part->size);
4306
4307         assert(total == (size_t) ((uint8_t*) e - (uint8_t*) p));
4308
4309         *buffer = p;
4310         *sz = total;
4311
4312         return 0;
4313 }
4314
4315 int bus_message_read_strv_extend(sd_bus_message *m, char ***l) {
4316         int r;
4317
4318         assert(m);
4319         assert(l);
4320
4321         r = sd_bus_message_enter_container(m, 'a', "s");
4322         if (r < 0)
4323                 return r;
4324
4325         for (;;) {
4326                 const char *s;
4327
4328                 r = sd_bus_message_read_basic(m, 's', &s);
4329                 if (r < 0)
4330                         return r;
4331                 if (r == 0)
4332                         break;
4333
4334                 r = strv_extend(l, s);
4335                 if (r < 0)
4336                         return r;
4337         }
4338
4339         r = sd_bus_message_exit_container(m);
4340         if (r < 0)
4341                 return r;
4342
4343         return 0;
4344 }
4345
4346 const char* bus_message_get_arg(sd_bus_message *m, unsigned i) {
4347         int r;
4348         const char *t = NULL;
4349         unsigned j;
4350
4351         assert(m);
4352
4353         r = sd_bus_message_rewind(m, true);
4354         if (r < 0)
4355                 return NULL;
4356
4357         for (j = 0; j <= i; j++) {
4358                 char type;
4359
4360                 r = sd_bus_message_peek_type(m, &type, NULL);
4361                 if (r < 0)
4362                         return NULL;
4363
4364                 if (type != SD_BUS_TYPE_STRING &&
4365                     type != SD_BUS_TYPE_OBJECT_PATH &&
4366                     type != SD_BUS_TYPE_SIGNATURE)
4367                         return NULL;
4368
4369                 r = sd_bus_message_read_basic(m, type, &t);
4370                 if (r < 0)
4371                         return NULL;
4372         }
4373
4374         return t;
4375 }
4376
4377 bool bus_header_is_complete(struct bus_header *h, size_t size) {
4378         size_t full;
4379
4380         assert(h);
4381         assert(size);
4382
4383         if (size < sizeof(struct bus_header))
4384                 return false;
4385
4386         full = sizeof(struct bus_header) +
4387                 (h->endian == SD_BUS_NATIVE_ENDIAN ? h->fields_size : bswap_32(h->fields_size));
4388
4389         return size >= full;
4390 }
4391
4392 int bus_header_message_size(struct bus_header *h, size_t *sum) {
4393         size_t fs, bs;
4394
4395         assert(h);
4396         assert(sum);
4397
4398         if (h->endian == SD_BUS_NATIVE_ENDIAN) {
4399                 fs = h->fields_size;
4400                 bs = h->body_size;
4401         } else if (h->endian == SD_BUS_REVERSE_ENDIAN) {
4402                 fs = bswap_32(h->fields_size);
4403                 bs = bswap_32(h->body_size);
4404         } else
4405                 return -EBADMSG;
4406
4407         *sum = sizeof(struct bus_header) + ALIGN8(fs) + bs;
4408         return 0;
4409 }
4410
4411 int sd_bus_message_get_errno(sd_bus_message *m) {
4412         assert_return(m, -EINVAL);
4413
4414         if (m->header->type != SD_BUS_MESSAGE_METHOD_ERROR)
4415                 return 0;
4416
4417         return sd_bus_error_get_errno(&m->error);
4418 }
4419
4420 const char* sd_bus_message_get_signature(sd_bus_message *m, int complete) {
4421         struct bus_container *c;
4422
4423         if (!m)
4424                 return NULL;
4425
4426         c = complete ? &m->root_container : message_get_container(m);
4427         return c->signature ?: "";
4428 }
4429
4430 int sd_bus_message_copy(sd_bus_message *m, sd_bus_message *source, int all) {
4431         bool done_something = false;
4432         int r;
4433
4434         assert_return(m, -EINVAL);
4435         assert_return(source, -EINVAL);
4436         assert_return(!m->sealed, -EPERM);
4437         assert_return(source->sealed, -EPERM);
4438
4439         do {
4440                 const char *contents;
4441                 char type;
4442                 union {
4443                         uint8_t u8;
4444                         uint16_t u16;
4445                         int16_t s16;
4446                         uint32_t u32;
4447                         int32_t s32;
4448                         uint64_t u64;
4449                         int64_t s64;
4450                         double d64;
4451                         const char *string;
4452                         int i;
4453                 } basic;
4454
4455                 r = sd_bus_message_peek_type(source, &type, &contents);
4456                 if (r < 0)
4457                         return r;
4458                 if (r == 0)
4459                         break;
4460
4461                 done_something = true;
4462
4463                 if (bus_type_is_container(type) > 0) {
4464
4465                         r = sd_bus_message_enter_container(source, type, contents);
4466                         if (r < 0)
4467                                 return r;
4468
4469                         r = sd_bus_message_open_container(m, type, contents);
4470                         if (r < 0)
4471                                 return r;
4472
4473                         r = sd_bus_message_copy(m, source, true);
4474                         if (r < 0)
4475                                 return r;
4476
4477                         r = sd_bus_message_close_container(m);
4478                         if (r < 0)
4479                                 return r;
4480
4481                         r = sd_bus_message_exit_container(source);
4482                         if (r < 0)
4483                                 return r;
4484
4485                         continue;
4486                 }
4487
4488                 r = sd_bus_message_read_basic(source, type, &basic);
4489                 if (r < 0)
4490                         return r;
4491
4492                 assert(r > 0);
4493
4494                 if (type == SD_BUS_TYPE_OBJECT_PATH ||
4495                     type == SD_BUS_TYPE_SIGNATURE ||
4496                     type == SD_BUS_TYPE_STRING)
4497                         r = sd_bus_message_append_basic(m, type, basic.string);
4498                 else
4499                         r = sd_bus_message_append_basic(m, type, &basic);
4500
4501                 if (r < 0)
4502                         return r;
4503
4504         } while (all);
4505
4506         return done_something;
4507 }
4508
4509 int sd_bus_message_verify_type(sd_bus_message *m, char type, const char *contents) {
4510         const char *c;
4511         char t;
4512         int r;
4513
4514         assert_return(m, -EINVAL);
4515         assert_return(m->sealed, -EPERM);
4516         assert_return(!type || bus_type_is_valid(type), -EINVAL);
4517         assert_return(!contents || signature_is_valid(contents, true), -EINVAL);
4518         assert_return(type || contents, -EINVAL);
4519         assert_return(!contents || !type || bus_type_is_container(type), -EINVAL);
4520
4521         r = sd_bus_message_peek_type(m, &t, &c);
4522         if (r <= 0)
4523                 return r;
4524
4525         if (type != 0 && type != t)
4526                 return 0;
4527
4528         if (contents && !streq_ptr(contents, c))
4529                 return 0;
4530
4531         return 1;
4532 }