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         void *q;
2646         int r;
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
2655         c = message_get_container(m);
2656
2657         if (!c->signature || c->signature[c->index] == 0)
2658                 return -ENXIO;
2659
2660         if (message_end_of_array(m, m->rindex))
2661                 return 0;
2662
2663         if (c->signature[c->index] != type)
2664                 return -ENXIO;
2665
2666         switch (type) {
2667
2668         case SD_BUS_TYPE_STRING:
2669         case SD_BUS_TYPE_OBJECT_PATH: {
2670                 uint32_t l;
2671                 size_t rindex;
2672
2673                 rindex = m->rindex;
2674                 r = message_peek_body(m, &rindex, 4, 4, &q);
2675                 if (r <= 0)
2676                         return r;
2677
2678                 l = BUS_MESSAGE_BSWAP32(m, *(uint32_t*) q);
2679                 r = message_peek_body(m, &rindex, 1, l+1, &q);
2680                 if (r < 0)
2681                         return r;
2682                 if (r == 0)
2683                         return -EBADMSG;
2684
2685                 if (type == SD_BUS_TYPE_OBJECT_PATH) {
2686                         if (!validate_object_path(q, l))
2687                                 return -EBADMSG;
2688                 } else {
2689                         if (!validate_string(q, l))
2690                                 return -EBADMSG;
2691                 }
2692
2693                 m->rindex = rindex;
2694                 if (p)
2695                         *(const char**) p = q;
2696
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
2721                 if (p)
2722                         *(const char**) p = q;
2723                 break;
2724         }
2725
2726         default: {
2727                 ssize_t sz, align;
2728                 size_t rindex;
2729
2730                 align = bus_type_get_alignment(type);
2731                 sz = bus_type_get_size(type);
2732                 assert(align > 0 && sz > 0);
2733
2734                 rindex = m->rindex;
2735                 r = message_peek_body(m, &rindex, align, sz, &q);
2736                 if (r <= 0)
2737                         return r;
2738
2739                 switch (type) {
2740
2741                 case SD_BUS_TYPE_BYTE:
2742                         if (p)
2743                                 *(uint8_t*) p = *(uint8_t*) q;
2744                         break;
2745
2746                 case SD_BUS_TYPE_BOOLEAN:
2747                         if (p)
2748                                 *(unsigned*) p = !!*(uint32_t*) q;
2749                         break;
2750
2751                 case SD_BUS_TYPE_INT16:
2752                 case SD_BUS_TYPE_UINT16:
2753                         if (p)
2754                                 *(uint16_t*) p = BUS_MESSAGE_BSWAP16(m, *(uint16_t*) q);
2755                         break;
2756
2757                 case SD_BUS_TYPE_INT32:
2758                 case SD_BUS_TYPE_UINT32:
2759                         if (p)
2760                                 *(uint32_t*) p = BUS_MESSAGE_BSWAP32(m, *(uint32_t*) q);
2761                         break;
2762
2763                 case SD_BUS_TYPE_INT64:
2764                 case SD_BUS_TYPE_UINT64:
2765                 case SD_BUS_TYPE_DOUBLE:
2766                         if (p)
2767                                 *(uint64_t*) p = BUS_MESSAGE_BSWAP64(m, *(uint64_t*) q);
2768                         break;
2769
2770                 case SD_BUS_TYPE_UNIX_FD: {
2771                         uint32_t j;
2772
2773                         j = BUS_MESSAGE_BSWAP32(m, *(uint32_t*) q);
2774                         if (j >= m->n_fds)
2775                                 return -EBADMSG;
2776
2777                         if (p)
2778                                 *(int*) p = m->fds[j];
2779                         break;
2780                 }
2781
2782                 default:
2783                         assert_not_reached("Unknown basic type...");
2784                 }
2785
2786                 m->rindex = rindex;
2787
2788                 break;
2789         }
2790         }
2791
2792         if (c->enclosing != SD_BUS_TYPE_ARRAY)
2793                 c->index++;
2794
2795         return 1;
2796 }
2797
2798 static int bus_message_enter_array(
2799                 sd_bus_message *m,
2800                 struct bus_container *c,
2801                 const char *contents,
2802                 uint32_t **array_size) {
2803
2804         size_t rindex;
2805         void *q;
2806         int r, alignment;
2807
2808         assert(m);
2809         assert(c);
2810         assert(contents);
2811         assert(array_size);
2812
2813         if (!signature_is_single(contents, true))
2814                 return -EINVAL;
2815
2816         alignment = bus_type_get_alignment(contents[0]);
2817         if (alignment < 0)
2818                 return alignment;
2819
2820         if (!c->signature || c->signature[c->index] == 0)
2821                 return 0;
2822
2823         if (c->signature[c->index] != SD_BUS_TYPE_ARRAY)
2824                 return -ENXIO;
2825
2826         if (!startswith(c->signature + c->index + 1, contents))
2827                 return -ENXIO;
2828
2829         rindex = m->rindex;
2830         r = message_peek_body(m, &rindex, 4, 4, &q);
2831         if (r <= 0)
2832                 return r;
2833
2834         if (BUS_MESSAGE_BSWAP32(m, *(uint32_t*) q) > BUS_ARRAY_MAX_SIZE)
2835                 return -EBADMSG;
2836
2837         r = message_peek_body(m, &rindex, alignment, 0, NULL);
2838         if (r < 0)
2839                 return r;
2840         if (r == 0)
2841                 return -EBADMSG;
2842
2843         if (c->enclosing != SD_BUS_TYPE_ARRAY)
2844                 c->index += 1 + strlen(contents);
2845
2846         m->rindex = rindex;
2847
2848         *array_size = (uint32_t*) q;
2849
2850         return 1;
2851 }
2852
2853 static int bus_message_enter_variant(
2854                 sd_bus_message *m,
2855                 struct bus_container *c,
2856                 const char *contents) {
2857
2858         size_t rindex;
2859         uint8_t l;
2860         void *q;
2861         int r;
2862
2863         assert(m);
2864         assert(c);
2865         assert(contents);
2866
2867         if (!signature_is_single(contents, false))
2868                 return -EINVAL;
2869
2870         if (*contents == SD_BUS_TYPE_DICT_ENTRY_BEGIN)
2871                 return -EINVAL;
2872
2873         if (!c->signature || c->signature[c->index] == 0)
2874                 return 0;
2875
2876         if (c->signature[c->index] != SD_BUS_TYPE_VARIANT)
2877                 return -ENXIO;
2878
2879         rindex = m->rindex;
2880         r = message_peek_body(m, &rindex, 1, 1, &q);
2881         if (r <= 0)
2882                 return r;
2883
2884         l = *(uint8_t*) q;
2885         r = message_peek_body(m, &rindex, 1, l+1, &q);
2886         if (r < 0)
2887                 return r;
2888         if (r == 0)
2889                 return -EBADMSG;
2890
2891         if (!validate_signature(q, l))
2892                 return -EBADMSG;
2893
2894         if (!streq(q, contents))
2895                 return -ENXIO;
2896
2897         if (c->enclosing != SD_BUS_TYPE_ARRAY)
2898                 c->index++;
2899
2900         m->rindex = rindex;
2901
2902         return 1;
2903 }
2904
2905 static int bus_message_enter_struct(
2906                 sd_bus_message *m,
2907                 struct bus_container *c,
2908                 const char *contents) {
2909
2910         size_t l;
2911         int r;
2912
2913         assert(m);
2914         assert(c);
2915         assert(contents);
2916
2917         if (!signature_is_valid(contents, false))
2918                 return -EINVAL;
2919
2920         if (!c->signature || c->signature[c->index] == 0)
2921                 return 0;
2922
2923         l = strlen(contents);
2924
2925         if (c->signature[c->index] != SD_BUS_TYPE_STRUCT_BEGIN ||
2926             !startswith(c->signature + c->index + 1, contents) ||
2927             c->signature[c->index + 1 + l] != SD_BUS_TYPE_STRUCT_END)
2928                 return -ENXIO;
2929
2930         r = message_peek_body(m, &m->rindex, 8, 0, NULL);
2931         if (r <= 0)
2932                 return r;
2933
2934         if (c->enclosing != SD_BUS_TYPE_ARRAY)
2935                 c->index += 1 + l + 1;
2936
2937         return 1;
2938 }
2939
2940 static int bus_message_enter_dict_entry(
2941                 sd_bus_message *m,
2942                 struct bus_container *c,
2943                 const char *contents) {
2944
2945         size_t l;
2946         int r;
2947
2948         assert(m);
2949         assert(c);
2950         assert(contents);
2951
2952         if (!signature_is_pair(contents))
2953                 return -EINVAL;
2954
2955         if (c->enclosing != SD_BUS_TYPE_ARRAY)
2956                 return -ENXIO;
2957
2958         if (!c->signature || c->signature[c->index] == 0)
2959                 return 0;
2960
2961         l = strlen(contents);
2962
2963         if (c->signature[c->index] != SD_BUS_TYPE_DICT_ENTRY_BEGIN ||
2964             !startswith(c->signature + c->index + 1, contents) ||
2965             c->signature[c->index + 1 + l] != SD_BUS_TYPE_DICT_ENTRY_END)
2966                 return -ENXIO;
2967
2968         r = message_peek_body(m, &m->rindex, 8, 0, NULL);
2969         if (r <= 0)
2970                 return r;
2971
2972         if (c->enclosing != SD_BUS_TYPE_ARRAY)
2973                 c->index += 1 + l + 1;
2974
2975         return 1;
2976 }
2977
2978 int sd_bus_message_enter_container(sd_bus_message *m, char type, const char *contents) {
2979         struct bus_container *c, *w;
2980         uint32_t *array_size = NULL;
2981         char *signature;
2982         size_t before;
2983         int r;
2984
2985         if (!m)
2986                 return -EINVAL;
2987         if (!m->sealed)
2988                 return -EPERM;
2989         if (!contents)
2990                 return -EINVAL;
2991
2992         /*
2993          * We enforce a global limit on container depth, that is much
2994          * higher than the 32 structs and 32 arrays the specification
2995          * mandates. This is simpler to implement for us, and we need
2996          * this only to ensure our container array doesn't grow
2997          * without bounds. We are happy to return any data from a
2998          * message as long as the data itself is valid, even if the
2999          * overall message might be not.
3000          *
3001          * Note that the message signature is validated when
3002          * parsing the headers, and that validation does check the
3003          * 32/32 limit.
3004          *
3005          * Note that the specification defines no limits on the depth
3006          * of stacked variants, but we do.
3007          */
3008         if (m->n_containers >= BUS_CONTAINER_DEPTH)
3009                 return -EBADMSG;
3010
3011         w = realloc(m->containers, sizeof(struct bus_container) * (m->n_containers + 1));
3012         if (!w)
3013                 return -ENOMEM;
3014         m->containers = w;
3015
3016         c = message_get_container(m);
3017
3018         if (!c->signature || c->signature[c->index] == 0)
3019                 return -ENXIO;
3020
3021         if (message_end_of_array(m, m->rindex))
3022                 return 0;
3023
3024         signature = strdup(contents);
3025         if (!signature)
3026                 return -ENOMEM;
3027
3028         c->saved_index = c->index;
3029         before = m->rindex;
3030
3031         if (type == SD_BUS_TYPE_ARRAY)
3032                 r = bus_message_enter_array(m, c, contents, &array_size);
3033         else if (type == SD_BUS_TYPE_VARIANT)
3034                 r = bus_message_enter_variant(m, c, contents);
3035         else if (type == SD_BUS_TYPE_STRUCT)
3036                 r = bus_message_enter_struct(m, c, contents);
3037         else if (type == SD_BUS_TYPE_DICT_ENTRY)
3038                 r = bus_message_enter_dict_entry(m, c, contents);
3039         else
3040                 r = -EINVAL;
3041
3042         if (r <= 0) {
3043                 free(signature);
3044                 return r;
3045         }
3046
3047         /* OK, let's fill it in */
3048         w += m->n_containers++;
3049         w->enclosing = type;
3050         w->signature = signature;
3051         w->index = 0;
3052         w->array_size = array_size;
3053         w->before = before;
3054         w->begin = m->rindex;
3055
3056         return 1;
3057 }
3058
3059 int sd_bus_message_exit_container(sd_bus_message *m) {
3060         struct bus_container *c;
3061
3062         if (!m)
3063                 return -EINVAL;
3064         if (!m->sealed)
3065                 return -EPERM;
3066         if (m->n_containers <= 0)
3067                 return -EINVAL;
3068
3069         c = message_get_container(m);
3070         if (c->enclosing == SD_BUS_TYPE_ARRAY) {
3071                 uint32_t l;
3072
3073                 l = BUS_MESSAGE_BSWAP32(m, *c->array_size);
3074                 if (c->begin + l != m->rindex)
3075                         return -EBUSY;
3076
3077         } else {
3078                 if (c->signature && c->signature[c->index] != 0)
3079                         return -EINVAL;
3080         }
3081
3082         free(c->signature);
3083         m->n_containers--;
3084
3085         return 1;
3086 }
3087
3088 static void message_quit_container(sd_bus_message *m) {
3089         struct bus_container *c;
3090
3091         assert(m);
3092         assert(m->sealed);
3093         assert(m->n_containers > 0);
3094
3095         c = message_get_container(m);
3096
3097         /* Undo seeks */
3098         assert(m->rindex >= c->before);
3099         m->rindex = c->before;
3100
3101         /* Free container */
3102         free(c->signature);
3103         m->n_containers--;
3104
3105         /* Correct index of new top-level container */
3106         c = message_get_container(m);
3107         c->index = c->saved_index;
3108 }
3109
3110 int sd_bus_message_peek_type(sd_bus_message *m, char *type, const char **contents) {
3111         struct bus_container *c;
3112         int r;
3113
3114         assert_return(m, -EINVAL);
3115         assert_return(m->sealed, -EPERM);
3116
3117         c = message_get_container(m);
3118
3119         if (!c->signature || c->signature[c->index] == 0)
3120                 goto eof;
3121
3122         if (message_end_of_array(m, m->rindex))
3123                 goto eof;
3124
3125         if (bus_type_is_basic(c->signature[c->index])) {
3126                 if (contents)
3127                         *contents = NULL;
3128                 if (type)
3129                         *type = c->signature[c->index];
3130                 return 1;
3131         }
3132
3133         if (c->signature[c->index] == SD_BUS_TYPE_ARRAY) {
3134
3135                 if (contents) {
3136                         size_t l;
3137                         char *sig;
3138
3139                         r = signature_element_length(c->signature+c->index+1, &l);
3140                         if (r < 0)
3141                                 return r;
3142
3143                         assert(l >= 1);
3144
3145                         sig = strndup(c->signature + c->index + 1, l);
3146                         if (!sig)
3147                                 return -ENOMEM;
3148
3149                         free(m->peeked_signature);
3150                         m->peeked_signature = sig;
3151
3152                         *contents = sig;
3153                 }
3154
3155                 if (type)
3156                         *type = SD_BUS_TYPE_ARRAY;
3157
3158                 return 1;
3159         }
3160
3161         if (c->signature[c->index] == SD_BUS_TYPE_STRUCT_BEGIN ||
3162             c->signature[c->index] == SD_BUS_TYPE_DICT_ENTRY_BEGIN) {
3163
3164                 if (contents) {
3165                         size_t l;
3166                         char *sig;
3167
3168                         r = signature_element_length(c->signature+c->index, &l);
3169                         if (r < 0)
3170                                 return r;
3171
3172                         assert(l >= 2);
3173                         sig = strndup(c->signature + c->index + 1, l - 2);
3174                         if (!sig)
3175                                 return -ENOMEM;
3176
3177                         free(m->peeked_signature);
3178                         m->peeked_signature = sig;
3179
3180                         *contents = sig;
3181                 }
3182
3183                 if (type)
3184                         *type = c->signature[c->index] == SD_BUS_TYPE_STRUCT_BEGIN ? SD_BUS_TYPE_STRUCT : SD_BUS_TYPE_DICT_ENTRY;
3185
3186                 return 1;
3187         }
3188
3189         if (c->signature[c->index] == SD_BUS_TYPE_VARIANT) {
3190                 if (contents) {
3191                         size_t rindex, l;
3192                         void *q;
3193
3194                         rindex = m->rindex;
3195                         r = message_peek_body(m, &rindex, 1, 1, &q);
3196                         if (r < 0)
3197                                 return r;
3198                         if (r == 0)
3199                                 goto eof;
3200
3201                         l = *(uint8_t*) q;
3202                         r = message_peek_body(m, &rindex, 1, l+1, &q);
3203                         if (r < 0)
3204                                 return r;
3205                         if (r == 0)
3206                                 return -EBADMSG;
3207
3208                         if (!validate_signature(q, l))
3209                                 return -EBADMSG;
3210
3211                         *contents = q;
3212                 }
3213
3214                 if (type)
3215                         *type = SD_BUS_TYPE_VARIANT;
3216
3217                 return 1;
3218         }
3219
3220         return -EINVAL;
3221
3222 eof:
3223         if (type)
3224                 *type = c->enclosing;
3225         if (contents)
3226                 *contents = NULL;
3227         return 0;
3228 }
3229
3230 int sd_bus_message_rewind(sd_bus_message *m, int complete) {
3231         struct bus_container *c;
3232
3233         if (!m)
3234                 return -EINVAL;
3235         if (!m->sealed)
3236                 return -EPERM;
3237
3238         if (complete) {
3239                 message_reset_containers(m);
3240                 m->rindex = 0;
3241                 m->root_container.index = 0;
3242
3243                 c = message_get_container(m);
3244         } else {
3245                 c = message_get_container(m);
3246
3247                 c->index = 0;
3248                 m->rindex = c->begin;
3249         }
3250
3251         return !isempty(c->signature);
3252 }
3253 static int message_read_ap(
3254                 sd_bus_message *m,
3255                 const char *types,
3256                 va_list ap) {
3257
3258         unsigned n_array, n_struct;
3259         TypeStack stack[BUS_CONTAINER_DEPTH];
3260         unsigned stack_ptr = 0;
3261         unsigned n_loop = 0;
3262         int r;
3263
3264         assert(m);
3265
3266         if (isempty(types))
3267                 return 0;
3268
3269         /* Ideally, we'd just call ourselves recursively on every
3270          * complex type. However, the state of a va_list that is
3271          * passed to a function is undefined after that function
3272          * returns. This means we need to docode the va_list linearly
3273          * in a single stackframe. We hence implement our own
3274          * home-grown stack in an array. */
3275
3276         n_array = (unsigned) -1; /* lenght of current array entries */
3277         n_struct = strlen(types); /* length of current struct contents signature */
3278
3279         for (;;) {
3280                 const char *t;
3281
3282                 n_loop++;
3283
3284                 if (n_array == 0 || (n_array == (unsigned) -1 && n_struct == 0)) {
3285                         r = type_stack_pop(stack, ELEMENTSOF(stack), &stack_ptr, &types, &n_struct, &n_array);
3286                         if (r < 0)
3287                                 return r;
3288                         if (r == 0)
3289                                 break;
3290
3291                         r = sd_bus_message_exit_container(m);
3292                         if (r < 0)
3293                                 return r;
3294
3295                         continue;
3296                 }
3297
3298                 t = types;
3299                 if (n_array != (unsigned) -1)
3300                         n_array --;
3301                 else {
3302                         types ++;
3303                         n_struct--;
3304                 }
3305
3306                 switch (*t) {
3307
3308                 case SD_BUS_TYPE_BYTE:
3309                 case SD_BUS_TYPE_BOOLEAN:
3310                 case SD_BUS_TYPE_INT16:
3311                 case SD_BUS_TYPE_UINT16:
3312                 case SD_BUS_TYPE_INT32:
3313                 case SD_BUS_TYPE_UINT32:
3314                 case SD_BUS_TYPE_INT64:
3315                 case SD_BUS_TYPE_UINT64:
3316                 case SD_BUS_TYPE_DOUBLE:
3317                 case SD_BUS_TYPE_STRING:
3318                 case SD_BUS_TYPE_OBJECT_PATH:
3319                 case SD_BUS_TYPE_SIGNATURE:
3320                 case SD_BUS_TYPE_UNIX_FD: {
3321                         void *p;
3322
3323                         p = va_arg(ap, void*);
3324                         r = sd_bus_message_read_basic(m, *t, p);
3325                         if (r < 0)
3326                                 return r;
3327                         if (r == 0) {
3328                                 if (n_loop <= 1)
3329                                         return 0;
3330
3331                                 return -ENXIO;
3332                         }
3333
3334                         break;
3335                 }
3336
3337                 case SD_BUS_TYPE_ARRAY: {
3338                         size_t k;
3339
3340                         r = signature_element_length(t + 1, &k);
3341                         if (r < 0)
3342                                 return r;
3343
3344                         {
3345                                 char s[k + 1];
3346                                 memcpy(s, t + 1, k);
3347                                 s[k] = 0;
3348
3349                                 r = sd_bus_message_enter_container(m, SD_BUS_TYPE_ARRAY, s);
3350                                 if (r < 0)
3351                                         return r;
3352                                 if (r == 0) {
3353                                         if (n_loop <= 1)
3354                                                 return 0;
3355
3356                                         return -ENXIO;
3357                                 }
3358                         }
3359
3360                         if (n_array == (unsigned) -1) {
3361                                 types += k;
3362                                 n_struct -= k;
3363                         }
3364
3365                         r = type_stack_push(stack, ELEMENTSOF(stack), &stack_ptr, types, n_struct, n_array);
3366                         if (r < 0)
3367                                 return r;
3368
3369                         types = t + 1;
3370                         n_struct = k;
3371                         n_array = va_arg(ap, unsigned);
3372
3373                         break;
3374                 }
3375
3376                 case SD_BUS_TYPE_VARIANT: {
3377                         const char *s;
3378
3379                         s = va_arg(ap, const char *);
3380                         if (!s)
3381                                 return -EINVAL;
3382
3383                         r = sd_bus_message_enter_container(m, SD_BUS_TYPE_VARIANT, s);
3384                         if (r < 0)
3385                                 return r;
3386                         if (r == 0) {
3387                                 if (n_loop <= 1)
3388                                         return 0;
3389
3390                                 return -ENXIO;
3391                         }
3392
3393                         r = type_stack_push(stack, ELEMENTSOF(stack), &stack_ptr, types, n_struct, n_array);
3394                         if (r < 0)
3395                                 return r;
3396
3397                         types = s;
3398                         n_struct = strlen(s);
3399                         n_array = (unsigned) -1;
3400
3401                         break;
3402                 }
3403
3404                 case SD_BUS_TYPE_STRUCT_BEGIN:
3405                 case SD_BUS_TYPE_DICT_ENTRY_BEGIN: {
3406                         size_t k;
3407
3408                         r = signature_element_length(t, &k);
3409                         if (r < 0)
3410                                 return r;
3411
3412                         {
3413                                 char s[k - 1];
3414                                 memcpy(s, t + 1, k - 2);
3415                                 s[k - 2] = 0;
3416
3417                                 r = sd_bus_message_enter_container(m, *t == SD_BUS_TYPE_STRUCT_BEGIN ? SD_BUS_TYPE_STRUCT : SD_BUS_TYPE_DICT_ENTRY, s);
3418                                 if (r < 0)
3419                                         return r;
3420                                 if (r == 0) {
3421                                         if (n_loop <= 1)
3422                                                 return 0;
3423                                         return -ENXIO;
3424                                 }
3425                         }
3426
3427                         if (n_array == (unsigned) -1) {
3428                                 types += k - 1;
3429                                 n_struct -= k - 1;
3430                         }
3431
3432                         r = type_stack_push(stack, ELEMENTSOF(stack), &stack_ptr, types, n_struct, n_array);
3433                         if (r < 0)
3434                                 return r;
3435
3436                         types = t + 1;
3437                         n_struct = k - 2;
3438                         n_array = (unsigned) -1;
3439
3440                         break;
3441                 }
3442
3443                 default:
3444                         return -EINVAL;
3445                 }
3446         }
3447
3448         return 1;
3449 }
3450
3451 int sd_bus_message_read(sd_bus_message *m, const char *types, ...) {
3452         va_list ap;
3453         int r;
3454
3455         assert_return(m, -EINVAL);
3456         assert_return(m->sealed, -EPERM);
3457         assert_return(types, -EINVAL);
3458
3459         va_start(ap, types);
3460         r = message_read_ap(m, types, ap);
3461         va_end(ap);
3462
3463         return r;
3464 }
3465
3466 int sd_bus_message_skip(sd_bus_message *m, const char *types) {
3467         int r;
3468
3469         assert_return(m, -EINVAL);
3470         assert_return(m->sealed, -EPERM);
3471         assert_return(types, -EINVAL);
3472
3473         if (isempty(types))
3474                 return 0;
3475
3476         switch (*types) {
3477
3478         case SD_BUS_TYPE_BYTE:
3479         case SD_BUS_TYPE_BOOLEAN:
3480         case SD_BUS_TYPE_INT16:
3481         case SD_BUS_TYPE_UINT16:
3482         case SD_BUS_TYPE_INT32:
3483         case SD_BUS_TYPE_UINT32:
3484         case SD_BUS_TYPE_INT64:
3485         case SD_BUS_TYPE_UINT64:
3486         case SD_BUS_TYPE_DOUBLE:
3487         case SD_BUS_TYPE_STRING:
3488         case SD_BUS_TYPE_OBJECT_PATH:
3489         case SD_BUS_TYPE_SIGNATURE:
3490         case SD_BUS_TYPE_UNIX_FD:
3491
3492                 r = sd_bus_message_read_basic(m, *types, NULL);
3493                 if (r <= 0)
3494                         return r;
3495
3496                 r = sd_bus_message_skip(m, types + 1);
3497                 if (r < 0)
3498                         return r;
3499
3500                 return 1;
3501
3502         case SD_BUS_TYPE_ARRAY: {
3503                 size_t k;
3504
3505                 r = signature_element_length(types + 1, &k);
3506                 if (r < 0)
3507                         return r;
3508
3509                 {
3510                         char s[k+1];
3511                         memcpy(s, types+1, k);
3512                         s[k] = 0;
3513
3514                         r = sd_bus_message_enter_container(m, SD_BUS_TYPE_ARRAY, s);
3515                         if (r <= 0)
3516                                 return r;
3517
3518                         for (;;) {
3519                                 r = sd_bus_message_skip(m, s);
3520                                 if (r < 0)
3521                                         return r;
3522                                 if (r == 0)
3523                                         break;
3524                         }
3525
3526                         r = sd_bus_message_exit_container(m);
3527                         if (r < 0)
3528                                 return r;
3529                 }
3530
3531                 r = sd_bus_message_skip(m, types + 1 + k);
3532                 if (r < 0)
3533                         return r;
3534
3535                 return 1;
3536         }
3537
3538         case SD_BUS_TYPE_VARIANT: {
3539                 const char *contents;
3540                 char x;
3541
3542                 r = sd_bus_message_peek_type(m, &x, &contents);
3543                 if (r <= 0)
3544                         return r;
3545
3546                 if (x != SD_BUS_TYPE_VARIANT)
3547                         return -ENXIO;
3548
3549                 r = sd_bus_message_enter_container(m, SD_BUS_TYPE_VARIANT, contents);
3550                 if (r <= 0)
3551                         return r;
3552
3553                 r = sd_bus_message_skip(m, contents);
3554                 if (r < 0)
3555                         return r;
3556                 assert(r != 0);
3557
3558                 r = sd_bus_message_exit_container(m);
3559                 if (r < 0)
3560                         return r;
3561
3562                 r = sd_bus_message_skip(m, types + 1);
3563                 if (r < 0)
3564                         return r;
3565
3566                 return 1;
3567         }
3568
3569         case SD_BUS_TYPE_STRUCT_BEGIN:
3570         case SD_BUS_TYPE_DICT_ENTRY_BEGIN: {
3571                 size_t k;
3572
3573                 r = signature_element_length(types, &k);
3574                 if (r < 0)
3575                         return r;
3576
3577                 {
3578                         char s[k-1];
3579                         memcpy(s, types+1, k-2);
3580                         s[k-2] = 0;
3581
3582                         r = sd_bus_message_enter_container(m, *types == SD_BUS_TYPE_STRUCT_BEGIN ? SD_BUS_TYPE_STRUCT : SD_BUS_TYPE_DICT_ENTRY, s);
3583                         if (r <= 0)
3584                                 return r;
3585
3586                         r = sd_bus_message_skip(m, s);
3587                         if (r < 0)
3588                                 return r;
3589                         assert(r != 0);
3590
3591                         r = sd_bus_message_exit_container(m);
3592                         if (r < 0)
3593                                 return r;
3594                 }
3595
3596                 r = sd_bus_message_skip(m, types + k);
3597                 if (r < 0)
3598                         return r;
3599
3600                 return 1;
3601         }
3602
3603         default:
3604                 return -EINVAL;
3605         }
3606 }
3607
3608 int sd_bus_message_read_array(sd_bus_message *m, char type, const void **ptr, size_t *size) {
3609         struct bus_container *c;
3610         void *p;
3611         size_t sz;
3612         ssize_t align;
3613         int r;
3614
3615         if (!m)
3616                 return -EINVAL;
3617         if (!m->sealed)
3618                 return -EPERM;
3619         if (!bus_type_is_trivial(type))
3620                 return -EINVAL;
3621         if (!ptr)
3622                 return -EINVAL;
3623         if (!size)
3624                 return -EINVAL;
3625         if (BUS_MESSAGE_NEED_BSWAP(m))
3626                 return -ENOTSUP;
3627
3628         align = bus_type_get_alignment(type);
3629         if (align < 0)
3630                 return align;
3631
3632         r = sd_bus_message_enter_container(m, SD_BUS_TYPE_ARRAY, CHAR_TO_STR(type));
3633         if (r <= 0)
3634                 return r;
3635
3636         c = message_get_container(m);
3637         sz = BUS_MESSAGE_BSWAP32(m, *c->array_size);
3638
3639         r = message_peek_body(m, &m->rindex, align, sz, &p);
3640         if (r < 0)
3641                 goto fail;
3642         if (r == 0) {
3643                 r = -EBADMSG;
3644                 goto fail;
3645         }
3646
3647         r = sd_bus_message_exit_container(m);
3648         if (r < 0)
3649                 goto fail;
3650
3651         *ptr = (const void*) p;
3652         *size = sz;
3653
3654         return 1;
3655
3656 fail:
3657         message_quit_container(m);
3658         return r;
3659 }
3660
3661 static int message_peek_fields(
3662                 sd_bus_message *m,
3663                 size_t *rindex,
3664                 size_t align,
3665                 size_t nbytes,
3666                 void **ret) {
3667
3668         assert(m);
3669         assert(rindex);
3670         assert(align > 0);
3671
3672         return buffer_peek(BUS_MESSAGE_FIELDS(m), BUS_MESSAGE_FIELDS_SIZE(m), rindex, align, nbytes, ret);
3673 }
3674
3675 static int message_peek_field_uint32(
3676                 sd_bus_message *m,
3677                 size_t *ri,
3678                 uint32_t *ret) {
3679
3680         int r;
3681         void *q;
3682
3683         assert(m);
3684         assert(ri);
3685
3686         r = message_peek_fields(m, ri, 4, 4, &q);
3687         if (r < 0)
3688                 return r;
3689
3690         if (ret)
3691                 *ret = BUS_MESSAGE_BSWAP32(m, *(uint32_t*) q);
3692
3693         return 0;
3694 }
3695
3696 static int message_peek_field_string(
3697                 sd_bus_message *m,
3698                 bool (*validate)(const char *p),
3699                 size_t *ri,
3700                 const char **ret) {
3701
3702         uint32_t l;
3703         int r;
3704         void *q;
3705
3706         assert(m);
3707         assert(ri);
3708
3709         r = message_peek_field_uint32(m, ri, &l);
3710         if (r < 0)
3711                 return r;
3712
3713         r = message_peek_fields(m, ri, 1, l+1, &q);
3714         if (r < 0)
3715                 return r;
3716
3717         if (validate) {
3718                 if (!validate_nul(q, l))
3719                         return -EBADMSG;
3720
3721                 if (!validate(q))
3722                         return -EBADMSG;
3723         } else {
3724                 if (!validate_string(q, l))
3725                         return -EBADMSG;
3726         }
3727
3728         if (ret)
3729                 *ret = q;
3730
3731         return 0;
3732 }
3733
3734 static int message_peek_field_signature(
3735                 sd_bus_message *m,
3736                 size_t *ri,
3737                 const char **ret) {
3738
3739         size_t l;
3740         int r;
3741         void *q;
3742
3743         assert(m);
3744         assert(ri);
3745
3746         r = message_peek_fields(m, ri, 1, 1, &q);
3747         if (r < 0)
3748                 return r;
3749
3750         l = *(uint8_t*) q;
3751         r = message_peek_fields(m, ri, 1, l+1, &q);
3752         if (r < 0)
3753                 return r;
3754
3755         if (!validate_signature(q, l))
3756                 return -EBADMSG;
3757
3758         if (ret)
3759                 *ret = q;
3760
3761         return 0;
3762 }
3763
3764 static int message_skip_fields(
3765                 sd_bus_message *m,
3766                 size_t *ri,
3767                 uint32_t array_size,
3768                 const char **signature) {
3769
3770         size_t original_index;
3771         int r;
3772
3773         assert(m);
3774         assert(ri);
3775         assert(signature);
3776
3777         original_index = *ri;
3778
3779         for (;;) {
3780                 char t;
3781                 size_t l;
3782
3783                 if (array_size != (uint32_t) -1 &&
3784                     array_size <= *ri - original_index)
3785                         return 0;
3786
3787                 t = **signature;
3788                 if (!t)
3789                         return 0;
3790
3791                 if (t == SD_BUS_TYPE_STRING) {
3792
3793                         r = message_peek_field_string(m, NULL, ri, NULL);
3794                         if (r < 0)
3795                                 return r;
3796
3797                         (*signature)++;
3798
3799                 } else if (t == SD_BUS_TYPE_OBJECT_PATH) {
3800
3801                         r = message_peek_field_string(m, object_path_is_valid, ri, NULL);
3802                         if (r < 0)
3803                                 return r;
3804
3805                         (*signature)++;
3806
3807                 } else if (t == SD_BUS_TYPE_SIGNATURE) {
3808
3809                         r = message_peek_field_signature(m, ri, NULL);
3810                         if (r < 0)
3811                                 return r;
3812
3813                         (*signature)++;
3814
3815                 } else if (bus_type_is_basic(t)) {
3816                         ssize_t align, k;
3817
3818                         align = bus_type_get_alignment(t);
3819                         k = bus_type_get_size(t);
3820                         assert(align > 0 && k > 0);
3821
3822                         r = message_peek_fields(m, ri, align, k, NULL);
3823                         if (r < 0)
3824                                 return r;
3825
3826                         (*signature)++;
3827
3828                 } else if (t == SD_BUS_TYPE_ARRAY) {
3829
3830                         r = signature_element_length(*signature+1, &l);
3831                         if (r < 0)
3832                                 return r;
3833
3834                         assert(l >= 1);
3835                         {
3836                                 char sig[l-1], *s;
3837                                 uint32_t nas;
3838                                 int alignment;
3839
3840                                 strncpy(sig, *signature + 1, l-1);
3841                                 s = sig;
3842
3843                                 alignment = bus_type_get_alignment(sig[0]);
3844                                 if (alignment < 0)
3845                                         return alignment;
3846
3847                                 r = message_peek_field_uint32(m, ri, &nas);
3848                                 if (r < 0)
3849                                         return r;
3850                                 if (nas > BUS_ARRAY_MAX_SIZE)
3851                                         return -EBADMSG;
3852
3853                                 r = message_peek_fields(m, ri, alignment, 0, NULL);
3854                                 if (r < 0)
3855                                         return r;
3856
3857                                 r = message_skip_fields(m, ri, nas, (const char**) &s);
3858                                 if (r < 0)
3859                                         return r;
3860                         }
3861
3862                         (*signature) += 1 + l;
3863
3864                 } else if (t == SD_BUS_TYPE_VARIANT) {
3865                         const char *s;
3866
3867                         r = message_peek_field_signature(m, ri, &s);
3868                         if (r < 0)
3869                                 return r;
3870
3871                         r = message_skip_fields(m, ri, (uint32_t) -1, (const char**) &s);
3872                         if (r < 0)
3873                                 return r;
3874
3875                         (*signature)++;
3876
3877                 } else if (t == SD_BUS_TYPE_STRUCT ||
3878                            t == SD_BUS_TYPE_DICT_ENTRY) {
3879
3880                         r = signature_element_length(*signature, &l);
3881                         if (r < 0)
3882                                 return r;
3883
3884                         assert(l >= 2);
3885                         {
3886                                 char sig[l-1], *s;
3887                                 strncpy(sig, *signature + 1, l-1);
3888                                 s = sig;
3889
3890                                 r = message_skip_fields(m, ri, (uint32_t) -1, (const char**) &s);
3891                                 if (r < 0)
3892                                         return r;
3893                         }
3894
3895                         *signature += l;
3896                 } else
3897                         return -EINVAL;
3898         }
3899 }
3900
3901 int bus_message_parse_fields(sd_bus_message *m) {
3902         size_t ri;
3903         int r;
3904         uint32_t unix_fds = 0;
3905
3906         assert(m);
3907
3908         for (ri = 0; ri < BUS_MESSAGE_FIELDS_SIZE(m); ) {
3909                 const char *signature;
3910                 uint8_t *header;
3911
3912                 r = message_peek_fields(m, &ri, 8, 1, (void**) &header);
3913                 if (r < 0)
3914                         return r;
3915
3916                 r = message_peek_field_signature(m, &ri, &signature);
3917                 if (r < 0)
3918                         return r;
3919
3920                 switch (*header) {
3921                 case _SD_BUS_MESSAGE_HEADER_INVALID:
3922                         return -EBADMSG;
3923
3924                 case SD_BUS_MESSAGE_HEADER_PATH:
3925
3926                         if (m->path)
3927                                 return -EBADMSG;
3928
3929                         if (!streq(signature, "o"))
3930                                 return -EBADMSG;
3931
3932                         r = message_peek_field_string(m, object_path_is_valid, &ri, &m->path);
3933                         break;
3934
3935                 case SD_BUS_MESSAGE_HEADER_INTERFACE:
3936
3937                         if (m->interface)
3938                                 return -EBADMSG;
3939
3940                         if (!streq(signature, "s"))
3941                                 return -EBADMSG;
3942
3943                         r = message_peek_field_string(m, interface_name_is_valid, &ri, &m->interface);
3944                         break;
3945
3946                 case SD_BUS_MESSAGE_HEADER_MEMBER:
3947
3948                         if (m->member)
3949                                 return -EBADMSG;
3950
3951                         if (!streq(signature, "s"))
3952                                 return -EBADMSG;
3953
3954                         r = message_peek_field_string(m, member_name_is_valid, &ri, &m->member);
3955                         break;
3956
3957                 case SD_BUS_MESSAGE_HEADER_ERROR_NAME:
3958
3959                         if (m->error.name)
3960                                 return -EBADMSG;
3961
3962                         if (!streq(signature, "s"))
3963                                 return -EBADMSG;
3964
3965                         r = message_peek_field_string(m, error_name_is_valid, &ri, &m->error.name);
3966                         break;
3967
3968                 case SD_BUS_MESSAGE_HEADER_DESTINATION:
3969
3970                         if (m->destination)
3971                                 return -EBADMSG;
3972
3973                         if (!streq(signature, "s"))
3974                                 return -EBADMSG;
3975
3976                         r = message_peek_field_string(m, service_name_is_valid, &ri, &m->destination);
3977                         break;
3978
3979                 case SD_BUS_MESSAGE_HEADER_SENDER:
3980
3981                         if (m->sender)
3982                                 return -EBADMSG;
3983
3984                         if (!streq(signature, "s"))
3985                                 return -EBADMSG;
3986
3987                         r = message_peek_field_string(m, service_name_is_valid, &ri, &m->sender);
3988                         break;
3989
3990
3991                 case SD_BUS_MESSAGE_HEADER_SIGNATURE: {
3992                         const char *s;
3993                         char *c;
3994
3995                         if (m->root_container.signature)
3996                                 return -EBADMSG;
3997
3998                         if (!streq(signature, "g"))
3999                                 return -EBADMSG;
4000
4001                         r = message_peek_field_signature(m, &ri, &s);
4002                         if (r < 0)
4003                                 return r;
4004
4005                         c = strdup(s);
4006                         if (!c)
4007                                 return -ENOMEM;
4008
4009                         free(m->root_container.signature);
4010                         m->root_container.signature = c;
4011                         break;
4012                 }
4013
4014                 case SD_BUS_MESSAGE_HEADER_REPLY_SERIAL:
4015                         if (m->reply_serial != 0)
4016                                 return -EBADMSG;
4017
4018                         if (!streq(signature, "u"))
4019                                 return -EBADMSG;
4020
4021                         r = message_peek_field_uint32(m, &ri, &m->reply_serial);
4022                         if (r < 0)
4023                                 return r;
4024
4025                         if (m->reply_serial == 0)
4026                                 return -EBADMSG;
4027
4028                         break;
4029
4030                 case SD_BUS_MESSAGE_HEADER_UNIX_FDS:
4031                         if (unix_fds != 0)
4032                                 return -EBADMSG;
4033
4034                         if (!streq(signature, "u"))
4035                                 return -EBADMSG;
4036
4037                         r = message_peek_field_uint32(m, &ri, &unix_fds);
4038                         if (r < 0)
4039                                 return -EBADMSG;
4040
4041                         if (unix_fds == 0)
4042                                 return -EBADMSG;
4043
4044                         break;
4045
4046                 default:
4047                         r = message_skip_fields(m, &ri, (uint32_t) -1, (const char **) &signature);
4048                 }
4049
4050                 if (r < 0)
4051                         return r;
4052         }
4053
4054         if (m->n_fds != unix_fds)
4055                 return -EBADMSG;
4056
4057         if (isempty(m->root_container.signature) != (BUS_MESSAGE_BODY_SIZE(m) == 0))
4058                 return -EBADMSG;
4059
4060         switch (m->header->type) {
4061
4062         case SD_BUS_MESSAGE_SIGNAL:
4063                 if (!m->path || !m->interface || !m->member)
4064                         return -EBADMSG;
4065                 break;
4066
4067         case SD_BUS_MESSAGE_METHOD_CALL:
4068
4069                 if (!m->path || !m->member)
4070                         return -EBADMSG;
4071
4072                 break;
4073
4074         case SD_BUS_MESSAGE_METHOD_RETURN:
4075
4076                 if (m->reply_serial == 0)
4077                         return -EBADMSG;
4078                 break;
4079
4080         case SD_BUS_MESSAGE_METHOD_ERROR:
4081
4082                 if (m->reply_serial == 0 || !m->error.name)
4083                         return -EBADMSG;
4084                 break;
4085         }
4086
4087         /* Try to read the error message, but if we can't it's a non-issue */
4088         if (m->header->type == SD_BUS_MESSAGE_METHOD_ERROR)
4089                 sd_bus_message_read(m, "s", &m->error.message);
4090
4091         return 0;
4092 }
4093
4094 int bus_message_seal(sd_bus_message *m, uint64_t serial) {
4095         struct bus_body_part *part;
4096         size_t l, a;
4097         unsigned i;
4098         int r;
4099
4100         assert(m);
4101
4102         if (m->sealed)
4103                 return -EPERM;
4104
4105         if (m->n_containers > 0)
4106                 return -EBADMSG;
4107
4108         if (m->poisoned)
4109                 return -ESTALE;
4110
4111         /* If there's a non-trivial signature set, then add it in here */
4112         if (!isempty(m->root_container.signature)) {
4113                 r = message_append_field_signature(m, SD_BUS_MESSAGE_HEADER_SIGNATURE, m->root_container.signature, NULL);
4114                 if (r < 0)
4115                         return r;
4116         }
4117
4118         if (m->n_fds > 0) {
4119                 r = message_append_field_uint32(m, SD_BUS_MESSAGE_HEADER_UNIX_FDS, m->n_fds);
4120                 if (r < 0)
4121                         return r;
4122         }
4123
4124         /* Add padding at the end of the fields part, since we know
4125          * the body needs to start at an 8 byte alignment. We made
4126          * sure we allocated enough space for this, so all we need to
4127          * do here is to zero it out. */
4128         l = BUS_MESSAGE_FIELDS_SIZE(m);
4129         a = ALIGN8(l) - l;
4130         if (a > 0)
4131                 memset((uint8_t*) BUS_MESSAGE_FIELDS(m) + l, 0, a);
4132
4133         /* If this is something we can send as memfd, then let's seal
4134         the memfd now. Note that we can send memfds as payload only
4135         for directed messages, and not for broadcasts. */
4136         if (m->destination && m->bus && m->bus->use_memfd) {
4137                 MESSAGE_FOREACH_PART(part, i, m)
4138                         if (part->memfd >= 0 && !part->sealed && (part->size > MEMFD_MIN_SIZE || m->bus->use_memfd < 0)) {
4139                                 bus_body_part_unmap(part);
4140
4141                                 if (ioctl(part->memfd, KDBUS_CMD_MEMFD_SEAL_SET, 1) >= 0)
4142                                         part->sealed = true;
4143                         }
4144         }
4145
4146         m->header->serial = serial;
4147         m->sealed = true;
4148
4149         return 0;
4150 }
4151
4152 int sd_bus_message_set_destination(sd_bus_message *m, const char *destination) {
4153         if (!m)
4154                 return -EINVAL;
4155         if (!destination)
4156                 return -EINVAL;
4157         if (m->sealed)
4158                 return -EPERM;
4159         if (m->destination)
4160                 return -EEXIST;
4161
4162         return message_append_field_string(m, SD_BUS_MESSAGE_HEADER_DESTINATION, SD_BUS_TYPE_STRING, destination, &m->destination);
4163 }
4164
4165 int bus_message_dump(sd_bus_message *m, FILE *f, bool with_header) {
4166         const char *u = NULL, *uu = NULL, *s = NULL;
4167         char **cmdline = NULL;
4168         unsigned level = 1;
4169         int r;
4170         uid_t owner, audit_loginuid;
4171         uint32_t audit_sessionid;
4172
4173         assert(m);
4174
4175         if (!f)
4176                 f = stdout;
4177
4178         if (with_header) {
4179                 fprintf(f,
4180                         "Message %p\n"
4181                         "\tn_ref=%u\n"
4182                         "\tendian=%c\n"
4183                         "\ttype=%i\n"
4184                         "\tflags=%u\n"
4185                         "\tversion=%u\n"
4186                         "\tserial=%u\n"
4187                         "\tfields_size=%u\n"
4188                         "\tbody_size=%u\n"
4189                         "\tpath=%s\n"
4190                         "\tinterface=%s\n"
4191                         "\tmember=%s\n"
4192                         "\tdestination=%s\n"
4193                         "\tsender=%s\n"
4194                         "\tsignature=%s\n"
4195                         "\treply_serial=%u\n"
4196                         "\tsealed=%s\n"
4197                         "\tn_body_parts=%u\n",
4198                         m,
4199                         m->n_ref,
4200                         m->header->endian,
4201                         m->header->type,
4202                         m->header->flags,
4203                         m->header->version,
4204                         BUS_MESSAGE_SERIAL(m),
4205                         BUS_MESSAGE_FIELDS_SIZE(m),
4206                         BUS_MESSAGE_BODY_SIZE(m),
4207                         strna(m->path),
4208                         strna(m->interface),
4209                         strna(m->member),
4210                         strna(m->destination),
4211                         strna(m->sender),
4212                         strna(m->root_container.signature),
4213                         m->reply_serial,
4214                         yes_no(m->sealed),
4215                         m->n_body_parts);
4216
4217                 if (sd_bus_error_is_set(&m->error))
4218                         fprintf(f,
4219                                 "\terror.name=%s\n"
4220                                 "\terror.message=%s\n",
4221                                 strna(m->error.name),
4222                                 strna(m->error.message));
4223
4224                 if (m->pid != 0)
4225                         fprintf(f, "\tpid=%lu\n", (unsigned long) m->pid);
4226                 if (m->tid != 0)
4227                         fprintf(f, "\ttid=%lu\n", (unsigned long) m->tid);
4228                 if (m->uid_valid)
4229                         fprintf(f, "\tuid=%lu\n", (unsigned long) m->uid);
4230                 if (m->gid_valid)
4231                         fprintf(f, "\tgid=%lu\n", (unsigned long) m->gid);
4232                 if (m->pid_starttime != 0)
4233                         fprintf(f, "\tpid_starttime=%llu\n", (unsigned long long) m->pid_starttime);
4234                 if (m->monotonic != 0)
4235                         fprintf(f, "\tmonotonic=%llu\n", (unsigned long long) m->monotonic);
4236                 if (m->realtime != 0)
4237                         fprintf(f, "\trealtime=%llu\n", (unsigned long long) m->realtime);
4238                 if (m->exe)
4239                         fprintf(f, "\texe=[%s]\n", m->exe);
4240                 if (m->comm)
4241                         fprintf(f, "\tcomm=[%s]\n", m->comm);
4242                 if (m->tid_comm)
4243                         fprintf(f, "\ttid_comm=[%s]\n", m->tid_comm);
4244                 if (m->label)
4245                         fprintf(f, "\tlabel=[%s]\n", m->label);
4246                 if (m->cgroup)
4247                         fprintf(f, "\tcgroup=[%s]\n", m->cgroup);
4248
4249                 sd_bus_message_get_unit(m, &u);
4250                 if (u)
4251                         fprintf(f, "\tunit=[%s]\n", u);
4252                 sd_bus_message_get_user_unit(m, &uu);
4253                 if (uu)
4254                         fprintf(f, "\tuser_unit=[%s]\n", uu);
4255                 sd_bus_message_get_session(m, &s);
4256                 if (s)
4257                         fprintf(f, "\tsession=[%s]\n", s);
4258                 if (sd_bus_message_get_owner_uid(m, &owner) >= 0)
4259                         fprintf(f, "\towner_uid=%lu\n", (unsigned long) owner);
4260                 if (sd_bus_message_get_audit_loginuid(m, &audit_loginuid) >= 0)
4261                         fprintf(f, "\taudit_loginuid=%lu\n", (unsigned long) audit_loginuid);
4262                 if (sd_bus_message_get_audit_sessionid(m, &audit_sessionid) >= 0)
4263                         fprintf(f, "\taudit_sessionid=%lu\n", (unsigned long) audit_sessionid);
4264
4265                 r = sd_bus_message_has_effective_cap(m, 5);
4266                 if (r >= 0)
4267                         fprintf(f, "\tCAP_KILL=%s\n", yes_no(r));
4268
4269                 if (sd_bus_message_get_cmdline(m, &cmdline) >= 0) {
4270                         char **c;
4271
4272                         fputs("\tcmdline=[", f);
4273                         STRV_FOREACH(c, cmdline) {
4274                                 if (c != cmdline)
4275                                         fputc(' ', f);
4276
4277                                 fputs(*c, f);
4278                         }
4279
4280                         fputs("]\n", f);
4281                 }
4282         }
4283
4284         r = sd_bus_message_rewind(m, true);
4285         if (r < 0) {
4286                 log_error("Failed to rewind: %s", strerror(-r));
4287                 return r;
4288         }
4289
4290         fprintf(f, "BEGIN_MESSAGE \"%s\" {\n", strempty(m->root_container.signature));
4291
4292         for(;;) {
4293                 _cleanup_free_ char *prefix = NULL;
4294                 const char *contents = NULL;
4295                 char type;
4296                 union {
4297                         uint8_t u8;
4298                         uint16_t u16;
4299                         int16_t s16;
4300                         uint32_t u32;
4301                         int32_t s32;
4302                         uint64_t u64;
4303                         int64_t s64;
4304                         double d64;
4305                         const char *string;
4306                         int i;
4307                 } basic;
4308
4309                 r = sd_bus_message_peek_type(m, &type, &contents);
4310                 if (r < 0) {
4311                         log_error("Failed to peek type: %s", strerror(-r));
4312                         return r;
4313                 }
4314                 if (r == 0) {
4315                         if (level <= 1)
4316                                 break;
4317
4318                         r = sd_bus_message_exit_container(m);
4319                         if (r < 0) {
4320                                 log_error("Failed to exit container: %s", strerror(-r));
4321                                 return r;
4322                         }
4323
4324                         level--;
4325
4326                         prefix = strrep("\t", level);
4327                         if (!prefix)
4328                                 return log_oom();
4329
4330                         if (type == SD_BUS_TYPE_ARRAY)
4331                                 fprintf(f, "%s} END_ARRAY \n", prefix);
4332                         else if (type == SD_BUS_TYPE_VARIANT)
4333                                 fprintf(f, "%s} END_VARIANT\n", prefix);
4334                         else if (type == SD_BUS_TYPE_STRUCT)
4335                                 fprintf(f, "%s} END_STRUCT\n", prefix);
4336                         else if (type == SD_BUS_TYPE_DICT_ENTRY)
4337                                 fprintf(f, "%s} END_DICT_ENTRY\n", prefix);
4338
4339                         continue;
4340                 }
4341
4342                 prefix = strrep("\t", level);
4343                 if (!prefix)
4344                         return log_oom();
4345
4346                 if (bus_type_is_container(type) > 0) {
4347                         r = sd_bus_message_enter_container(m, type, contents);
4348                         if (r < 0) {
4349                                 log_error("Failed to enter container: %s", strerror(-r));
4350                                 return r;
4351                         }
4352
4353                         if (type == SD_BUS_TYPE_ARRAY)
4354                                 fprintf(f, "%sBEGIN_ARRAY \"%s\" {\n", prefix, contents);
4355                         else if (type == SD_BUS_TYPE_VARIANT)
4356                                 fprintf(f, "%sBEGIN_VARIANT \"%s\" {\n", prefix, contents);
4357                         else if (type == SD_BUS_TYPE_STRUCT)
4358                                 fprintf(f, "%sBEGIN_STRUCT \"%s\" {\n", prefix, contents);
4359                         else if (type == SD_BUS_TYPE_DICT_ENTRY)
4360                                 fprintf(f, "%sBEGIN_DICT_ENTRY \"%s\" {\n", prefix, contents);
4361
4362                         level ++;
4363
4364                         continue;
4365                 }
4366
4367                 r = sd_bus_message_read_basic(m, type, &basic);
4368                 if (r < 0) {
4369                         log_error("Failed to get basic: %s", strerror(-r));
4370                         return r;
4371                 }
4372
4373                 assert(r > 0);
4374
4375                 switch (type) {
4376
4377                 case SD_BUS_TYPE_BYTE:
4378                         fprintf(f, "%sBYTE: %u\n", prefix, basic.u8);
4379                         break;
4380
4381                 case SD_BUS_TYPE_BOOLEAN:
4382                         fprintf(f, "%sBOOLEAN: %s\n", prefix, yes_no(basic.i));
4383                         break;
4384
4385                 case SD_BUS_TYPE_INT16:
4386                         fprintf(f, "%sINT16: %i\n", prefix, basic.s16);
4387                         break;
4388
4389                 case SD_BUS_TYPE_UINT16:
4390                         fprintf(f, "%sUINT16: %u\n", prefix, basic.u16);
4391                         break;
4392
4393                 case SD_BUS_TYPE_INT32:
4394                         fprintf(f, "%sINT32: %i\n", prefix, basic.s32);
4395                         break;
4396
4397                 case SD_BUS_TYPE_UINT32:
4398                         fprintf(f, "%sUINT32: %u\n", prefix, basic.u32);
4399                         break;
4400
4401                 case SD_BUS_TYPE_INT64:
4402                         fprintf(f, "%sINT64: %lli\n", prefix, (long long) basic.s64);
4403                         break;
4404
4405                 case SD_BUS_TYPE_UINT64:
4406                         fprintf(f, "%sUINT64: %llu\n", prefix, (unsigned long long) basic.u64);
4407                         break;
4408
4409                 case SD_BUS_TYPE_DOUBLE:
4410                         fprintf(f, "%sDOUBLE: %g\n", prefix, basic.d64);
4411                         break;
4412
4413                 case SD_BUS_TYPE_STRING:
4414                         fprintf(f, "%sSTRING: \"%s\"\n", prefix, basic.string);
4415                         break;
4416
4417                 case SD_BUS_TYPE_OBJECT_PATH:
4418                         fprintf(f, "%sOBJECT_PATH: \"%s\"\n", prefix, basic.string);
4419                         break;
4420
4421                 case SD_BUS_TYPE_SIGNATURE:
4422                         fprintf(f, "%sSIGNATURE: \"%s\"\n", prefix, basic.string);
4423                         break;
4424
4425                 case SD_BUS_TYPE_UNIX_FD:
4426                         fprintf(f, "%sUNIX_FD: %i\n", prefix, basic.i);
4427                         break;
4428
4429                 default:
4430                         assert_not_reached("Unknown basic type.");
4431                 }
4432         }
4433
4434         fprintf(f, "} END_MESSAGE\n");
4435         return 0;
4436 }
4437
4438 int bus_message_get_blob(sd_bus_message *m, void **buffer, size_t *sz) {
4439         size_t total;
4440         void *p, *e;
4441         unsigned i;
4442         struct bus_body_part *part;
4443
4444         assert(m);
4445         assert(buffer);
4446         assert(sz);
4447
4448         total = BUS_MESSAGE_SIZE(m);
4449
4450         p = malloc(total);
4451         if (!p)
4452                 return -ENOMEM;
4453
4454         e = mempcpy(p, m->header, BUS_MESSAGE_BODY_BEGIN(m));
4455         MESSAGE_FOREACH_PART(part, i, m)
4456                 e = mempcpy(e, part->data, part->size);
4457
4458         assert(total == (size_t) ((uint8_t*) e - (uint8_t*) p));
4459
4460         *buffer = p;
4461         *sz = total;
4462
4463         return 0;
4464 }
4465
4466 int bus_message_read_strv_extend(sd_bus_message *m, char ***l) {
4467         int r;
4468
4469         assert(m);
4470         assert(l);
4471
4472         r = sd_bus_message_enter_container(m, 'a', "s");
4473         if (r < 0)
4474                 return r;
4475
4476         for (;;) {
4477                 const char *s;
4478
4479                 r = sd_bus_message_read_basic(m, 's', &s);
4480                 if (r < 0)
4481                         return r;
4482                 if (r == 0)
4483                         break;
4484
4485                 r = strv_extend(l, s);
4486                 if (r < 0)
4487                         return r;
4488         }
4489
4490         r = sd_bus_message_exit_container(m);
4491         if (r < 0)
4492                 return r;
4493
4494         return 0;
4495 }
4496
4497 const char* bus_message_get_arg(sd_bus_message *m, unsigned i) {
4498         int r;
4499         const char *t = NULL;
4500         unsigned j;
4501
4502         assert(m);
4503
4504         r = sd_bus_message_rewind(m, true);
4505         if (r < 0)
4506                 return NULL;
4507
4508         for (j = 0; j <= i; j++) {
4509                 char type;
4510
4511                 r = sd_bus_message_peek_type(m, &type, NULL);
4512                 if (r < 0)
4513                         return NULL;
4514
4515                 if (type != SD_BUS_TYPE_STRING &&
4516                     type != SD_BUS_TYPE_OBJECT_PATH &&
4517                     type != SD_BUS_TYPE_SIGNATURE)
4518                         return NULL;
4519
4520                 r = sd_bus_message_read_basic(m, type, &t);
4521                 if (r < 0)
4522                         return NULL;
4523         }
4524
4525         return t;
4526 }
4527
4528 bool bus_header_is_complete(struct bus_header *h, size_t size) {
4529         size_t full;
4530
4531         assert(h);
4532         assert(size);
4533
4534         if (size < sizeof(struct bus_header))
4535                 return false;
4536
4537         full = sizeof(struct bus_header) +
4538                 (h->endian == SD_BUS_NATIVE_ENDIAN ? h->fields_size : bswap_32(h->fields_size));
4539
4540         return size >= full;
4541 }
4542
4543 int bus_header_message_size(struct bus_header *h, size_t *sum) {
4544         size_t fs, bs;
4545
4546         assert(h);
4547         assert(sum);
4548
4549         if (h->endian == SD_BUS_NATIVE_ENDIAN) {
4550                 fs = h->fields_size;
4551                 bs = h->body_size;
4552         } else if (h->endian == SD_BUS_REVERSE_ENDIAN) {
4553                 fs = bswap_32(h->fields_size);
4554                 bs = bswap_32(h->body_size);
4555         } else
4556                 return -EBADMSG;
4557
4558         *sum = sizeof(struct bus_header) + ALIGN8(fs) + bs;
4559         return 0;
4560 }
4561
4562 int sd_bus_message_get_errno(sd_bus_message *m) {
4563         assert_return(m, -EINVAL);
4564
4565         if (m->header->type != SD_BUS_MESSAGE_METHOD_ERROR)
4566                 return 0;
4567
4568         return sd_bus_error_get_errno(&m->error);
4569 }
4570
4571 const char* sd_bus_message_get_signature(sd_bus_message *m, int complete) {
4572         struct bus_container *c;
4573
4574         if (!m)
4575                 return NULL;
4576
4577         c = complete ? &m->root_container : message_get_container(m);
4578         return c->signature ?: "";
4579 }
4580
4581 int sd_bus_message_copy(sd_bus_message *m, sd_bus_message *source, int all) {
4582         bool done_something = false;
4583         int r;
4584
4585         assert_return(m, -EINVAL);
4586         assert_return(source, -EINVAL);
4587         assert_return(!m->sealed, -EPERM);
4588         assert_return(source->sealed, -EPERM);
4589
4590         do {
4591                 const char *contents;
4592                 char type;
4593                 union {
4594                         uint8_t u8;
4595                         uint16_t u16;
4596                         int16_t s16;
4597                         uint32_t u32;
4598                         int32_t s32;
4599                         uint64_t u64;
4600                         int64_t s64;
4601                         double d64;
4602                         const char *string;
4603                         int i;
4604                 } basic;
4605
4606                 r = sd_bus_message_peek_type(source, &type, &contents);
4607                 if (r < 0)
4608                         return r;
4609                 if (r == 0)
4610                         break;
4611
4612                 done_something = true;
4613
4614                 if (bus_type_is_container(type) > 0) {
4615
4616                         r = sd_bus_message_enter_container(source, type, contents);
4617                         if (r < 0)
4618                                 return r;
4619
4620                         r = sd_bus_message_open_container(m, type, contents);
4621                         if (r < 0)
4622                                 return r;
4623
4624                         r = sd_bus_message_copy(m, source, true);
4625                         if (r < 0)
4626                                 return r;
4627
4628                         r = sd_bus_message_close_container(m);
4629                         if (r < 0)
4630                                 return r;
4631
4632                         r = sd_bus_message_exit_container(source);
4633                         if (r < 0)
4634                                 return r;
4635
4636                         continue;
4637                 }
4638
4639                 r = sd_bus_message_read_basic(source, type, &basic);
4640                 if (r < 0)
4641                         return r;
4642
4643                 assert(r > 0);
4644
4645                 if (type == SD_BUS_TYPE_OBJECT_PATH ||
4646                     type == SD_BUS_TYPE_SIGNATURE ||
4647                     type == SD_BUS_TYPE_STRING)
4648                         r = sd_bus_message_append_basic(m, type, basic.string);
4649                 else
4650                         r = sd_bus_message_append_basic(m, type, &basic);
4651
4652                 if (r < 0)
4653                         return r;
4654
4655         } while (all);
4656
4657         return done_something;
4658 }
4659
4660 int sd_bus_message_verify_type(sd_bus_message *m, char type, const char *contents) {
4661         const char *c;
4662         char t;
4663         int r;
4664
4665         assert_return(m, -EINVAL);
4666         assert_return(m->sealed, -EPERM);
4667         assert_return(!type || bus_type_is_valid(type), -EINVAL);
4668         assert_return(!contents || signature_is_valid(contents, true), -EINVAL);
4669         assert_return(type || contents, -EINVAL);
4670         assert_return(!contents || !type || bus_type_is_container(type), -EINVAL);
4671
4672         r = sd_bus_message_peek_type(m, &t, &c);
4673         if (r <= 0)
4674                 return r;
4675
4676         if (type != 0 && type != t)
4677                 return 0;
4678
4679         if (contents && !streq_ptr(contents, c))
4680                 return 0;
4681
4682         return 1;
4683 }