source/librpc/ndr/ndr.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    libndr interface
   5
   6    Copyright (C) Andrew Tridgell 2003
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 2 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21 */
  22
  23 /*
  24   this provides the core routines for NDR parsing functions
  25
  26   see http://www.opengroup.org/onlinepubs/9629399/chap14.htm for details
  27   of NDR encoding rules
  28 */
  29
  30 #include "includes.h"
  31
  32 #define NDR_BASE_MARSHALL_SIZE 1024
  33
  34 /* this guid indicates NDR encoding in a protocol tower */
  35 const struct dcerpc_syntax_id ndr_transfer_syntax = {
  36   { 0x8a885d04, 0x1ceb, 0x11c9, {0x9f, 0xe8}, {0x08,0x00,0x2b,0x10,0x48,0x60} },
  37   2
  38 };
  39
  40 const struct dcerpc_syntax_id ndr64_transfer_syntax = {
  41   { 0x71710533, 0xbeba, 0x4937, {0x83, 0x19}, {0xb5,0xdb,0xef,0x9c,0xcc,0x36} },
  42   1
  43 };
  44
  45 /*
  46   work out the number of bytes needed to align on a n byte boundary
  47 */
  48 size_t ndr_align_size(uint32_t offset, size_t n)
  49 {
  50         if ((offset & (n-1)) == 0) return 0;
  51         return n - (offset & (n-1));
  52 }
  53
  54 /*
  55   initialise a ndr parse structure from a data blob
  56 */
  57 struct ndr_pull *ndr_pull_init_blob(const DATA_BLOB *blob, TALLOC_CTX *mem_ctx)
  58 {
  59         struct ndr_pull *ndr;
  60
  61         ndr = talloc_zero(mem_ctx, struct ndr_pull);
  62         if (!ndr) return NULL;
  63         ndr->current_mem_ctx = mem_ctx;
  64
  65         ndr->data = blob->data;
  66         ndr->data_size = blob->length;
  67
  68         return ndr;
  69 }
  70
  71 /*
  72   advance by 'size' bytes
  73 */
  74 NTSTATUS ndr_pull_advance(struct ndr_pull *ndr, uint32_t size)
  75 {
  76         ndr->offset += size;
  77         if (ndr->offset > ndr->data_size) {
  78                 return ndr_pull_error(ndr, NDR_ERR_BUFSIZE,
  79                                       "ndr_pull_advance by %u failed",
  80                                       size);
  81         }
  82         return NT_STATUS_OK;
  83 }
  84
  85 /*
  86   set the parse offset to 'ofs'
  87 */
  88 static NTSTATUS ndr_pull_set_offset(struct ndr_pull *ndr, uint32_t ofs)
  89 {
  90         ndr->offset = ofs;
  91         if (ndr->offset > ndr->data_size) {
  92                 return ndr_pull_error(ndr, NDR_ERR_BUFSIZE,
  93                                       "ndr_pull_set_offset %u failed",
  94                                       ofs);
  95         }
  96         return NT_STATUS_OK;
  97 }
  98
  99 /* save the offset/size of the current ndr state */
 100 void ndr_pull_save(struct ndr_pull *ndr, struct ndr_pull_save *save)
 101 {
 102         save->offset = ndr->offset;
 103         save->data_size = ndr->data_size;
 104 }
 105
 106 /* restore the size/offset of a ndr structure */
 107 void ndr_pull_restore(struct ndr_pull *ndr, struct ndr_pull_save *save)
 108 {
 109         ndr->offset = save->offset;
 110         ndr->data_size = save->data_size;
 111 }
 112
 113
 114 /* create a ndr_push structure, ready for some marshalling */
 115 struct ndr_push *ndr_push_init_ctx(TALLOC_CTX *mem_ctx)
 116 {
 117         struct ndr_push *ndr;
 118
 119         ndr = talloc_zero(mem_ctx, struct ndr_push);
 120         if (!ndr) {
 121                 return NULL;
 122         }
 123
 124         ndr->flags = 0;
 125         ndr->alloc_size = NDR_BASE_MARSHALL_SIZE;
 126         ndr->data = talloc_array(ndr, uint8_t, ndr->alloc_size);
 127         if (!ndr->data) {
 128                 return NULL;
 129         }
 130
 131         return ndr;
 132 }
 133
 134
 135 /* create a ndr_push structure, ready for some marshalling */
 136 struct ndr_push *ndr_push_init(void)
 137 {
 138         return ndr_push_init_ctx(NULL);
 139 }
 140
 141 /* free a ndr_push structure */
 142 void ndr_push_free(struct ndr_push *ndr)
 143 {
 144         talloc_free(ndr);
 145 }
 146
 147
 148 /* return a DATA_BLOB structure for the current ndr_push marshalled data */
 149 DATA_BLOB ndr_push_blob(struct ndr_push *ndr)
 150 {
 151         DATA_BLOB blob;
 152         blob.data = ndr->data;
 153         blob.length = ndr->offset;
 154         blob.free = NULL;
 155         if (ndr->alloc_size > ndr->offset) {
 156                 ndr->data[ndr->offset] = 0;
 157         }
 158         return blob;
 159 }
 160
 161
 162 /*
 163   expand the available space in the buffer to ndr->offset + extra_size
 164 */
 165 NTSTATUS ndr_push_expand(struct ndr_push *ndr, uint32_t extra_size)
 166 {
 167         uint32_t size = extra_size + ndr->offset;
 168
 169         if (size < ndr->offset) {
 170                 /* extra_size overflowed the offset */
 171                 return ndr_push_error(ndr, NDR_ERR_BUFSIZE, "Overflow in push_expand to %u",
 172                                         size);
 173         }
 174
 175         if (ndr->alloc_size > size) {
 176                 return NT_STATUS_OK;
 177         }
 178
 179         ndr->alloc_size += NDR_BASE_MARSHALL_SIZE;
 180         if (size+1 > ndr->alloc_size) {
 181                 ndr->alloc_size = size+1;
 182         }
 183         ndr->data = talloc_realloc(ndr, ndr->data, uint8_t, ndr->alloc_size);
 184         if (!ndr->data) {
 185                 return ndr_push_error(ndr, NDR_ERR_ALLOC, "Failed to push_expand to %u",
 186                                       ndr->alloc_size);
 187         }
 188
 189         return NT_STATUS_OK;
 190 }
 191
 192 void ndr_print_debug_helper(struct ndr_print *ndr, const char *format, ...) _PRINTF_ATTRIBUTE(2,3)
 193 {
 194         va_list ap;
 195         char *s = NULL;
 196         int i;
 197
 198         va_start(ap, format);
 199         vasprintf(&s, format, ap);
 200         va_end(ap);
 201
 202         for (i=0;i<ndr->depth;i++) {
 203                 DEBUG(0,("    "));
 204         }
 205
 206         DEBUG(0,("%s\n", s));
 207         free(s);
 208 }
 209
 210 static void ndr_print_string_helper(struct ndr_print *ndr, const char *format, ...) _PRINTF_ATTRIBUTE(2,3)
 211 {
 212         va_list ap;
 213         int i;
 214
 215         for (i=0;i<ndr->depth;i++) {
 216                 ndr->private_data = talloc_asprintf_append(
 217                         (char *)ndr->private_data, "    ");
 218         }
 219
 220         va_start(ap, format);
 221         ndr->private_data = talloc_vasprintf_append(
 222                 (char *)ndr->private_data, format, ap);
 223         va_end(ap);
 224         ndr->private_data = talloc_asprintf_append(
 225                 (char *)ndr->private_data, "\n");
 226 }
 227
 228 /*
 229   a useful helper function for printing idl structures via DEBUG()
 230 */
 231 void ndr_print_debug(ndr_print_fn_t fn, const char *name, void *ptr)
 232 {
 233         struct ndr_print *ndr;
 234
 235         ndr = talloc_zero(NULL, struct ndr_print);
 236         if (!ndr) return;
 237         ndr->print = ndr_print_debug_helper;
 238         ndr->depth = 1;
 239         ndr->flags = 0;
 240         fn(ndr, name, ptr);
 241         talloc_free(ndr);
 242 }
 243
 244 /*
 245   a useful helper function for printing idl unions via DEBUG()
 246 */
 247 void ndr_print_union_debug(ndr_print_fn_t fn, const char *name, uint32_t level, void *ptr)
 248 {
 249         struct ndr_print *ndr;
 250
 251         ndr = talloc_zero(NULL, struct ndr_print);
 252         if (!ndr) return;
 253         ndr->print = ndr_print_debug_helper;
 254         ndr->depth = 1;
 255         ndr->flags = 0;
 256         ndr_print_set_switch_value(ndr, ptr, level);
 257         fn(ndr, name, ptr);
 258         talloc_free(ndr);
 259 }
 260
 261 /*
 262   a useful helper function for printing idl function calls via DEBUG()
 263 */
 264 void ndr_print_function_debug(ndr_print_function_t fn, const char *name, int flags, void *ptr)
 265 {
 266         struct ndr_print *ndr;
 267
 268         ndr = talloc_zero(NULL, struct ndr_print);
 269         if (!ndr) return;
 270         ndr->print = ndr_print_debug_helper;
 271         ndr->depth = 1;
 272         ndr->flags = 0;
 273         fn(ndr, name, flags, ptr);
 274         talloc_free(ndr);
 275 }
 276
 277
 278 /*
 279   a useful helper function for printing idl function calls to a string
 280 */
 281 char *ndr_print_function_string(TALLOC_CTX *mem_ctx,
 282                                 ndr_print_function_t fn, const char *name,
 283                                 int flags, void *ptr)
 284 {
 285         struct ndr_print *ndr;
 286         char *ret = NULL;
 287
 288         ndr = talloc_zero(mem_ctx, struct ndr_print);
 289         if (!ndr) return NULL;
 290         if (!(ndr->private_data = talloc_strdup(mem_ctx, ""))) {
 291                 TALLOC_FREE(ndr);
 292                 return NULL;
 293         }
 294         ndr->print = ndr_print_string_helper;
 295         ndr->depth = 1;
 296         ndr->flags = 0;
 297         fn(ndr, name, flags, ptr);
 298         ret = (char *)ndr->private_data;
 299         talloc_free(ndr);
 300         return ret;
 301 }
 302
 303 void ndr_set_flags(uint32_t *pflags, uint32_t new_flags)
 304 {
 305         /* the big/little endian flags are inter-dependent */
 306         if (new_flags & LIBNDR_FLAG_LITTLE_ENDIAN) {
 307                 (*pflags) &= ~LIBNDR_FLAG_BIGENDIAN;
 308         }
 309         if (new_flags & LIBNDR_FLAG_BIGENDIAN) {
 310                 (*pflags) &= ~LIBNDR_FLAG_LITTLE_ENDIAN;
 311         }
 312         if (new_flags & LIBNDR_FLAG_REMAINING) {
 313                 (*pflags) &= ~LIBNDR_ALIGN_FLAGS;
 314         }
 315         if (new_flags & LIBNDR_ALIGN_FLAGS) {
 316                 (*pflags) &= ~LIBNDR_FLAG_REMAINING;
 317         }
 318         (*pflags) |= new_flags;
 319 }
 320
 321 static NTSTATUS ndr_map_error(enum ndr_err_code ndr_err)
 322 {
 323         switch (ndr_err) {
 324         case NDR_ERR_BUFSIZE:
 325                 return NT_STATUS_BUFFER_TOO_SMALL;
 326         case NDR_ERR_TOKEN:
 327                 return NT_STATUS_INTERNAL_ERROR;
 328         case NDR_ERR_ALLOC:
 329                 return NT_STATUS_NO_MEMORY;
 330         case NDR_ERR_ARRAY_SIZE:
 331                 return NT_STATUS_ARRAY_BOUNDS_EXCEEDED;
 332         default:
 333                 break;
 334         }
 335
 336         /* we should map all error codes to different status codes */
 337         return NT_STATUS_INVALID_PARAMETER;
 338 }
 339
 340 /*
 341   return and possibly log an NDR error
 342 */
 343 NTSTATUS ndr_pull_error(struct ndr_pull *ndr,
 344                                  enum ndr_err_code ndr_err,
 345                                  const char *format, ...) _PRINTF_ATTRIBUTE(3,4)
 346 {
 347         char *s=NULL;
 348         va_list ap;
 349
 350         va_start(ap, format);
 351         vasprintf(&s, format, ap);
 352         va_end(ap);
 353
 354         DEBUG(3,("ndr_pull_error(%u): %s\n", ndr_err, s));
 355
 356         free(s);
 357
 358         return ndr_map_error(ndr_err);
 359 }
 360
 361 /*
 362   return and possibly log an NDR error
 363 */
 364 NTSTATUS ndr_push_error(struct ndr_push *ndr,
 365                                  enum ndr_err_code ndr_err,
 366                                  const char *format, ...)  _PRINTF_ATTRIBUTE(3,4)
 367 {
 368         char *s=NULL;
 369         va_list ap;
 370
 371         va_start(ap, format);
 372         vasprintf(&s, format, ap);
 373         va_end(ap);
 374
 375         DEBUG(3,("ndr_push_error(%u): %s\n", ndr_err, s));
 376
 377         free(s);
 378
 379         return ndr_map_error(ndr_err);
 380 }
 381
 382 /*
 383   handle subcontext buffers, which in midl land are user-marshalled, but
 384   we use magic in pidl to make them easier to cope with
 385 */
 386 NTSTATUS ndr_pull_subcontext_start(struct ndr_pull *ndr,
 387                                    struct ndr_pull **_subndr,
 388                                    size_t header_size,
 389                                    ssize_t size_is)
 390 {
 391         struct ndr_pull *subndr;
 392         uint32_t r_content_size;
 393
 394         switch (header_size) {
 395         case 0: {
 396                 uint32_t content_size = ndr->data_size - ndr->offset;
 397                 if (size_is >= 0) {
 398                         content_size = size_is;
 399                 }
 400                 r_content_size = content_size;
 401                 break;
 402         }
 403
 404         case 2: {
 405                 uint16_t content_size;
 406                 NDR_CHECK(ndr_pull_uint16(ndr, NDR_SCALARS, &content_size));
 407                 if (size_is >= 0 && size_is != content_size) {
 408                         return ndr_pull_error(ndr, NDR_ERR_SUBCONTEXT, "Bad subcontext (PULL) size_is(%d) mismatch content_size %d",
 409                                                 (int)size_is, (int)content_size);
 410                 }
 411                 r_content_size = content_size;
 412                 break;
 413         }
 414
 415         case 4: {
 416                 uint32_t content_size;
 417                 NDR_CHECK(ndr_pull_uint32(ndr, NDR_SCALARS, &content_size));
 418                 if (size_is >= 0 && size_is != content_size) {
 419                         return ndr_pull_error(ndr, NDR_ERR_SUBCONTEXT, "Bad subcontext (PULL) size_is(%d) mismatch content_size %d",
 420                                                 (int)size_is, (int)content_size);
 421                 }
 422                 r_content_size = content_size;
 423                 break;
 424         }
 425         default:
 426                 return ndr_pull_error(ndr, NDR_ERR_SUBCONTEXT, "Bad subcontext (PULL) header_size %d",
 427                                       (int)header_size);
 428         }
 429
 430         NDR_PULL_NEED_BYTES(ndr, r_content_size);
 431
 432         subndr = talloc_zero(ndr, struct ndr_pull);
 433         NT_STATUS_HAVE_NO_MEMORY(subndr);
 434         subndr->flags           = ndr->flags;
 435         subndr->current_mem_ctx = ndr->current_mem_ctx;
 436
 437         subndr->data = ndr->data + ndr->offset;
 438         subndr->offset = 0;
 439         subndr->data_size = r_content_size;
 440
 441         *_subndr = subndr;
 442         return NT_STATUS_OK;
 443 }
 444
 445 NTSTATUS ndr_pull_subcontext_end(struct ndr_pull *ndr,
 446                                  struct ndr_pull *subndr,
 447                                  size_t header_size,
 448                                  ssize_t size_is)
 449 {
 450         uint32_t advance;
 451         if (size_is >= 0) {
 452                 advance = size_is;
 453         } else if (header_size > 0) {
 454                 advance = subndr->data_size;
 455         } else {
 456                 advance = subndr->offset;
 457         }
 458         NDR_CHECK(ndr_pull_advance(ndr, advance));
 459         return NT_STATUS_OK;
 460 }
 461
 462 NTSTATUS ndr_push_subcontext_start(struct ndr_push *ndr,
 463                                    struct ndr_push **_subndr,
 464                                    size_t header_size,
 465                                    ssize_t size_is)
 466 {
 467         struct ndr_push *subndr;
 468
 469         subndr = ndr_push_init_ctx(ndr);
 470         NT_STATUS_HAVE_NO_MEMORY(subndr);
 471         subndr->flags   = ndr->flags;
 472
 473         *_subndr = subndr;
 474         return NT_STATUS_OK;
 475 }
 476
 477 /*
 478   push a subcontext header
 479 */
 480 NTSTATUS ndr_push_subcontext_end(struct ndr_push *ndr,
 481                                  struct ndr_push *subndr,
 482                                  size_t header_size,
 483                                  ssize_t size_is)
 484 {
 485         if (size_is >= 0) {
 486                 ssize_t padding_len = size_is - subndr->offset;
 487                 if (padding_len > 0) {
 488                         NDR_CHECK(ndr_push_zero(subndr, padding_len));
 489                 } else if (padding_len < 0) {
 490                         return ndr_push_error(ndr, NDR_ERR_SUBCONTEXT, "Bad subcontext (PUSH) content_size %d is larger than size_is(%d)",
 491                                               (int)subndr->offset, (int)size_is);
 492                 }
 493         }
 494
 495         switch (header_size) {
 496         case 0:
 497                 break;
 498
 499         case 2:
 500                 NDR_CHECK(ndr_push_uint16(ndr, NDR_SCALARS, subndr->offset));
 501                 break;
 502
 503         case 4:
 504                 NDR_CHECK(ndr_push_uint32(ndr, NDR_SCALARS, subndr->offset));
 505                 break;
 506
 507         default:
 508                 return ndr_push_error(ndr, NDR_ERR_SUBCONTEXT, "Bad subcontext header size %d",
 509                                       (int)header_size);
 510         }
 511
 512         NDR_CHECK(ndr_push_bytes(ndr, subndr->data, subndr->offset));
 513         return NT_STATUS_OK;
 514 }
 515
 516 /*
 517   store a token in the ndr context, for later retrieval
 518 */
 519 NTSTATUS ndr_token_store(TALLOC_CTX *mem_ctx,
 520                          struct ndr_token_list **list,
 521                          const void *key,
 522                          uint32_t value)
 523 {
 524         struct ndr_token_list *tok;
 525         tok = talloc(mem_ctx, struct ndr_token_list);
 526         if (tok == NULL) {
 527                 return NT_STATUS_NO_MEMORY;
 528         }
 529         tok->key = key;
 530         tok->value = value;
 531         DLIST_ADD((*list), tok);
 532         return NT_STATUS_OK;
 533 }
 534
 535 /*
 536   retrieve a token from a ndr context, using cmp_fn to match the tokens
 537 */
 538 NTSTATUS ndr_token_retrieve_cmp_fn(struct ndr_token_list **list, const void *key, uint32_t *v,
 539                                    comparison_fn_t _cmp_fn, BOOL _remove_tok)
 540 {
 541         struct ndr_token_list *tok;
 542         for (tok=*list;tok;tok=tok->next) {
 543                 if (_cmp_fn && _cmp_fn(tok->key,key)==0) goto found;
 544                 else if (!_cmp_fn && tok->key == key) goto found;
 545         }
 546         return ndr_map_error(NDR_ERR_TOKEN);
 547 found:
 548         *v = tok->value;
 549         if (_remove_tok) {
 550                 DLIST_REMOVE((*list), tok);
 551                 talloc_free(tok);
 552         }
 553         return NT_STATUS_OK;
 554 }
 555
 556 /*
 557   retrieve a token from a ndr context
 558 */
 559 NTSTATUS ndr_token_retrieve(struct ndr_token_list **list, const void *key, uint32_t *v)
 560 {
 561         return ndr_token_retrieve_cmp_fn(list, key, v, NULL, True);
 562 }
 563
 564 /*
 565   peek at but don't removed a token from a ndr context
 566 */
 567 uint32_t ndr_token_peek(struct ndr_token_list **list, const void *key)
 568 {
 569         NTSTATUS status;
 570         uint32_t v;
 571         status = ndr_token_retrieve_cmp_fn(list, key, &v, NULL, False);
 572         if (NT_STATUS_IS_OK(status)) return v;
 573         return 0;
 574 }
 575
 576 /*
 577   pull an array size field and add it to the array_size_list token list
 578 */
 579 NTSTATUS ndr_pull_array_size(struct ndr_pull *ndr, const void *p)
 580 {
 581         uint32_t size;
 582         NDR_CHECK(ndr_pull_uint32(ndr, NDR_SCALARS, &size));
 583         return ndr_token_store(ndr, &ndr->array_size_list, p, size);
 584 }
 585
 586 /*
 587   get the stored array size field
 588 */
 589 uint32_t ndr_get_array_size(struct ndr_pull *ndr, const void *p)
 590 {
 591         return ndr_token_peek(&ndr->array_size_list, p);
 592 }
 593
 594 /*
 595   check the stored array size field
 596 */
 597 NTSTATUS ndr_check_array_size(struct ndr_pull *ndr, void *p, uint32_t size)
 598 {
 599         uint32_t stored;
 600         stored = ndr_token_peek(&ndr->array_size_list, p);
 601         if (stored != size) {
 602                 return ndr_pull_error(ndr, NDR_ERR_ARRAY_SIZE,
 603                                       "Bad array size - got %u expected %u\n",
 604                                       stored, size);
 605         }
 606         return NT_STATUS_OK;
 607 }
 608
 609 /*
 610   pull an array length field and add it to the array_length_list token list
 611 */
 612 NTSTATUS ndr_pull_array_length(struct ndr_pull *ndr, const void *p)
 613 {
 614         uint32_t length, offset;
 615         NDR_CHECK(ndr_pull_uint32(ndr, NDR_SCALARS, &offset));
 616         if (offset != 0) {
 617                 return ndr_pull_error(ndr, NDR_ERR_ARRAY_SIZE,
 618                                       "non-zero array offset %u\n", offset);
 619         }
 620         NDR_CHECK(ndr_pull_uint32(ndr, NDR_SCALARS, &length));
 621         return ndr_token_store(ndr, &ndr->array_length_list, p, length);
 622 }
 623
 624 /*
 625   get the stored array length field
 626 */
 627 uint32_t ndr_get_array_length(struct ndr_pull *ndr, const void *p)
 628 {
 629         return ndr_token_peek(&ndr->array_length_list, p);
 630 }
 631
 632 /*
 633   check the stored array length field
 634 */
 635 NTSTATUS ndr_check_array_length(struct ndr_pull *ndr, void *p, uint32_t length)
 636 {
 637         uint32_t stored;
 638         stored = ndr_token_peek(&ndr->array_length_list, p);
 639         if (stored != length) {
 640                 return ndr_pull_error(ndr, NDR_ERR_ARRAY_SIZE,
 641                                       "Bad array length - got %u expected %u\n",
 642                                       stored, length);
 643         }
 644         return NT_STATUS_OK;
 645 }
 646
 647 /*
 648   store a switch value
 649  */
 650 NTSTATUS ndr_push_set_switch_value(struct ndr_push *ndr, const void *p, uint32_t val)
 651 {
 652         return ndr_token_store(ndr, &ndr->switch_list, p, val);
 653 }
 654
 655 NTSTATUS ndr_pull_set_switch_value(struct ndr_pull *ndr, const void *p, uint32_t val)
 656 {
 657         return ndr_token_store(ndr, &ndr->switch_list, p, val);
 658 }
 659
 660 NTSTATUS ndr_print_set_switch_value(struct ndr_print *ndr, const void *p, uint32_t val)
 661 {
 662         return ndr_token_store(ndr, &ndr->switch_list, p, val);
 663 }
 664
 665 /*
 666   retrieve a switch value
 667  */
 668 uint32_t ndr_push_get_switch_value(struct ndr_push *ndr, const void *p)
 669 {
 670         return ndr_token_peek(&ndr->switch_list, p);
 671 }
 672
 673 uint32_t ndr_pull_get_switch_value(struct ndr_pull *ndr, const void *p)
 674 {
 675         return ndr_token_peek(&ndr->switch_list, p);
 676 }
 677
 678 uint32_t ndr_print_get_switch_value(struct ndr_print *ndr, const void *p)
 679 {
 680         return ndr_token_peek(&ndr->switch_list, p);
 681 }
 682
 683 /*
 684   pull a struct from a blob using NDR
 685 */
 686 NTSTATUS ndr_pull_struct_blob(const DATA_BLOB *blob, TALLOC_CTX *mem_ctx, void *p,
 687                               ndr_pull_flags_fn_t fn)
 688 {
 689         struct ndr_pull *ndr;
 690         ndr = ndr_pull_init_blob(blob, mem_ctx);
 691         if (!ndr) {
 692                 return NT_STATUS_NO_MEMORY;
 693         }
 694         return fn(ndr, NDR_SCALARS|NDR_BUFFERS, p);
 695 }
 696
 697 /*
 698   pull a struct from a blob using NDR - failing if all bytes are not consumed
 699 */
 700 NTSTATUS ndr_pull_struct_blob_all(const DATA_BLOB *blob, TALLOC_CTX *mem_ctx, void *p,
 701                                   ndr_pull_flags_fn_t fn)
 702 {
 703         struct ndr_pull *ndr;
 704         NTSTATUS status;
 705
 706         ndr = ndr_pull_init_blob(blob, mem_ctx);
 707         if (!ndr) {
 708                 return NT_STATUS_NO_MEMORY;
 709         }
 710         status = fn(ndr, NDR_SCALARS|NDR_BUFFERS, p);
 711         if (!NT_STATUS_IS_OK(status)) return status;
 712         if (ndr->offset != ndr->data_size) {
 713                 return NT_STATUS_BUFFER_TOO_SMALL;
 714         }
 715         return status;
 716 }
 717
 718 /*
 719   pull a union from a blob using NDR, given the union discriminator
 720 */
 721 NTSTATUS ndr_pull_union_blob(const DATA_BLOB *blob, TALLOC_CTX *mem_ctx, void *p,
 722                              uint32_t level, ndr_pull_flags_fn_t fn)
 723 {
 724         struct ndr_pull *ndr;
 725         NTSTATUS status;
 726
 727         ndr = ndr_pull_init_blob(blob, mem_ctx);
 728         if (!ndr) {
 729                 return NT_STATUS_NO_MEMORY;
 730         }
 731         ndr_pull_set_switch_value(ndr, p, level);
 732         status = fn(ndr, NDR_SCALARS|NDR_BUFFERS, p);
 733         if (!NT_STATUS_IS_OK(status)) return status;
 734         if (ndr->offset != ndr->data_size) {
 735                 return NT_STATUS_BUFFER_TOO_SMALL;
 736         }
 737         return status;
 738 }
 739
 740 /*
 741   push a struct to a blob using NDR
 742 */
 743 NTSTATUS ndr_push_struct_blob(DATA_BLOB *blob, TALLOC_CTX *mem_ctx, const void *p,
 744                               ndr_push_flags_fn_t fn)
 745 {
 746         NTSTATUS status;
 747         struct ndr_push *ndr;
 748         ndr = ndr_push_init_ctx(mem_ctx);
 749         if (!ndr) {
 750                 return NT_STATUS_NO_MEMORY;
 751         }
 752         status = fn(ndr, NDR_SCALARS|NDR_BUFFERS, p);
 753         if (!NT_STATUS_IS_OK(status)) {
 754                 return status;
 755         }
 756
 757         *blob = ndr_push_blob(ndr);
 758
 759         return NT_STATUS_OK;
 760 }
 761
 762 /*
 763   push a union to a blob using NDR
 764 */
 765 NTSTATUS ndr_push_union_blob(DATA_BLOB *blob, TALLOC_CTX *mem_ctx, void *p,
 766                              uint32_t level, ndr_push_flags_fn_t fn)
 767 {
 768         NTSTATUS status;
 769         struct ndr_push *ndr;
 770         ndr = ndr_push_init_ctx(mem_ctx);
 771         if (!ndr) {
 772                 return NT_STATUS_NO_MEMORY;
 773         }
 774         ndr_push_set_switch_value(ndr, p, level);
 775         status = fn(ndr, NDR_SCALARS|NDR_BUFFERS, p);
 776         if (!NT_STATUS_IS_OK(status)) {
 777                 return status;
 778         }
 779
 780         *blob = ndr_push_blob(ndr);
 781
 782         return NT_STATUS_OK;
 783 }
 784
 785 /*
 786   generic ndr_size_*() handler for structures
 787 */
 788 size_t ndr_size_struct(const void *p, int flags, ndr_push_flags_fn_t push)
 789 {
 790         struct ndr_push *ndr;
 791         NTSTATUS status;
 792         size_t ret;
 793
 794         /* avoid recursion */
 795         if (flags & LIBNDR_FLAG_NO_NDR_SIZE) return 0;
 796
 797         ndr = ndr_push_init_ctx(NULL);
 798         if (!ndr) return 0;
 799         ndr->flags |= flags | LIBNDR_FLAG_NO_NDR_SIZE;
 800         status = push(ndr, NDR_SCALARS|NDR_BUFFERS, p);
 801         if (!NT_STATUS_IS_OK(status)) {
 802                 return 0;
 803         }
 804         ret = ndr->offset;
 805         talloc_free(ndr);
 806         return ret;
 807 }
 808
 809 /*
 810   generic ndr_size_*() handler for unions
 811 */
 812 size_t ndr_size_union(const void *p, int flags, uint32_t level, ndr_push_flags_fn_t push)
 813 {
 814         struct ndr_push *ndr;
 815         NTSTATUS status;
 816         size_t ret;
 817
 818         /* avoid recursion */
 819         if (flags & LIBNDR_FLAG_NO_NDR_SIZE) return 0;
 820
 821         ndr = ndr_push_init_ctx(NULL);
 822         if (!ndr) return 0;
 823         ndr->flags |= flags | LIBNDR_FLAG_NO_NDR_SIZE;
 824         ndr_push_set_switch_value(ndr, p, level);
 825         status = push(ndr, NDR_SCALARS|NDR_BUFFERS, p);
 826         if (!NT_STATUS_IS_OK(status)) {
 827                 return 0;
 828         }
 829         ret = ndr->offset;
 830         talloc_free(ndr);
 831         return ret;
 832 }
 833
 834 /*
 835   get the current base for relative pointers for the push
 836 */
 837 uint32_t ndr_push_get_relative_base_offset(struct ndr_push *ndr)
 838 {
 839         return ndr->relative_base_offset;
 840 }
 841
 842 /*
 843   restore the old base for relative pointers for the push
 844 */
 845 void ndr_push_restore_relative_base_offset(struct ndr_push *ndr, uint32_t offset)
 846 {
 847         ndr->relative_base_offset = offset;
 848 }
 849
 850 /*
 851   setup the current base for relative pointers for the push
 852   called in the NDR_SCALAR stage
 853 */
 854 NTSTATUS ndr_push_setup_relative_base_offset1(struct ndr_push *ndr, const void *p, uint32_t offset)
 855 {
 856         ndr->relative_base_offset = offset;
 857         return ndr_token_store(ndr, &ndr->relative_base_list, p, offset);
 858 }
 859
 860 /*
 861   setup the current base for relative pointers for the push
 862   called in the NDR_BUFFERS stage
 863 */
 864 NTSTATUS ndr_push_setup_relative_base_offset2(struct ndr_push *ndr, const void *p)
 865 {
 866         return ndr_token_retrieve(&ndr->relative_base_list, p, &ndr->relative_base_offset);
 867 }
 868
 869 /*
 870   push a relative object - stage1
 871   this is called during SCALARS processing
 872 */
 873 NTSTATUS ndr_push_relative_ptr1(struct ndr_push *ndr, const void *p)
 874 {
 875         if (p == NULL) {
 876                 NDR_CHECK(ndr_push_uint32(ndr, NDR_SCALARS, 0));
 877                 return NT_STATUS_OK;
 878         }
 879         NDR_CHECK(ndr_push_align(ndr, 4));
 880         NDR_CHECK(ndr_token_store(ndr, &ndr->relative_list, p, ndr->offset));
 881         return ndr_push_uint32(ndr, NDR_SCALARS, 0xFFFFFFFF);
 882 }
 883
 884 /*
 885   push a relative object - stage2
 886   this is called during buffers processing
 887 */
 888 NTSTATUS ndr_push_relative_ptr2(struct ndr_push *ndr, const void *p)
 889 {
 890         struct ndr_push_save save;
 891         uint32_t ptr_offset = 0xFFFFFFFF;
 892         if (p == NULL) {
 893                 return NT_STATUS_OK;
 894         }
 895         ndr_push_save(ndr, &save);
 896         NDR_CHECK(ndr_token_retrieve(&ndr->relative_list, p, &ptr_offset));
 897         if (ptr_offset > ndr->offset) {
 898                 return ndr_push_error(ndr, NDR_ERR_BUFSIZE,
 899                                       "ndr_push_relative_ptr2 ptr_offset(%u) > ndr->offset(%u)",
 900                                       ptr_offset, ndr->offset);
 901         }
 902         ndr->offset = ptr_offset;
 903         if (save.offset < ndr->relative_base_offset) {
 904                 return ndr_push_error(ndr, NDR_ERR_BUFSIZE,
 905                                       "ndr_push_relative_ptr2 save.offset(%u) < ndr->relative_base_offset(%u)",
 906                                       save.offset, ndr->relative_base_offset);
 907         }
 908         NDR_CHECK(ndr_push_uint32(ndr, NDR_SCALARS, save.offset - ndr->relative_base_offset));
 909         ndr_push_restore(ndr, &save);
 910         return NT_STATUS_OK;
 911 }
 912
 913 /*
 914   get the current base for relative pointers for the pull
 915 */
 916 uint32_t ndr_pull_get_relative_base_offset(struct ndr_pull *ndr)
 917 {
 918         return ndr->relative_base_offset;
 919 }
 920
 921 /*
 922   restore the old base for relative pointers for the pull
 923 */
 924 void ndr_pull_restore_relative_base_offset(struct ndr_pull *ndr, uint32_t offset)
 925 {
 926         ndr->relative_base_offset = offset;
 927 }
 928
 929 /*
 930   setup the current base for relative pointers for the pull
 931   called in the NDR_SCALAR stage
 932 */
 933 NTSTATUS ndr_pull_setup_relative_base_offset1(struct ndr_pull *ndr, const void *p, uint32_t offset)
 934 {
 935         ndr->relative_base_offset = offset;
 936         return ndr_token_store(ndr, &ndr->relative_base_list, p, offset);
 937 }
 938
 939 /*
 940   setup the current base for relative pointers for the pull
 941   called in the NDR_BUFFERS stage
 942 */
 943 NTSTATUS ndr_pull_setup_relative_base_offset2(struct ndr_pull *ndr, const void *p)
 944 {
 945         return ndr_token_retrieve(&ndr->relative_base_list, p, &ndr->relative_base_offset);
 946 }
 947
 948 /*
 949   pull a relative object - stage1
 950   called during SCALARS processing
 951 */
 952 NTSTATUS ndr_pull_relative_ptr1(struct ndr_pull *ndr, const void *p, uint32_t rel_offset)
 953 {
 954         rel_offset += ndr->relative_base_offset;
 955         if (rel_offset > ndr->data_size) {
 956                 return ndr_pull_error(ndr, NDR_ERR_BUFSIZE,
 957                                       "ndr_pull_relative_ptr1 rel_offset(%u) > ndr->data_size(%u)",
 958                                       rel_offset, ndr->data_size);
 959         }
 960         return ndr_token_store(ndr, &ndr->relative_list, p, rel_offset);
 961 }
 962
 963 /*
 964   pull a relative object - stage2
 965   called during BUFFERS processing
 966 */
 967 NTSTATUS ndr_pull_relative_ptr2(struct ndr_pull *ndr, const void *p)
 968 {
 969         uint32_t rel_offset;
 970         NDR_CHECK(ndr_token_retrieve(&ndr->relative_list, p, &rel_offset));
 971         return ndr_pull_set_offset(ndr, rel_offset);
 972 }