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 3 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, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 /*
  23   this provides the core routines for NDR parsing functions
  24
  25   see http://www.opengroup.org/onlinepubs/9629399/chap14.htm for details
  26   of NDR encoding rules
  27 */
  28
  29 #include "includes.h"
  30 #include "librpc/ndr/libndr.h"
  31 #include "../lib/util/dlinklist.h"
  32 #if _SAMBA_BUILD_ == 4
  33 #include "param/param.h"
  34 #endif
  35
  36 #define NDR_BASE_MARSHALL_SIZE 1024
  37
  38 /* this guid indicates NDR encoding in a protocol tower */
  39 const struct ndr_syntax_id ndr_transfer_syntax = {
  40   { 0x8a885d04, 0x1ceb, 0x11c9, {0x9f, 0xe8}, {0x08,0x00,0x2b,0x10,0x48,0x60} },
  41   2
  42 };
  43
  44 const struct ndr_syntax_id ndr64_transfer_syntax = {
  45   { 0x71710533, 0xbeba, 0x4937, {0x83, 0x19}, {0xb5,0xdb,0xef,0x9c,0xcc,0x36} },
  46   1
  47 };
  48
  49 const struct ndr_syntax_id null_ndr_syntax_id = {
  50   { 0, 0, 0, { 0, 0 }, { 0, 0, 0, 0, 0, 0 } },
  51   0
  52 };
  53
  54 /*
  55   work out the number of bytes needed to align on a n byte boundary
  56 */
  57 _PUBLIC_ size_t ndr_align_size(uint32_t offset, size_t n)
  58 {
  59         if ((offset & (n-1)) == 0) return 0;
  60         return n - (offset & (n-1));
  61 }
  62
  63 /*
  64   initialise a ndr parse structure from a data blob
  65 */
  66 _PUBLIC_ struct ndr_pull *ndr_pull_init_blob(const DATA_BLOB *blob, TALLOC_CTX *mem_ctx)
  67 {
  68         struct ndr_pull *ndr;
  69
  70         ndr = talloc_zero(mem_ctx, struct ndr_pull);
  71         if (!ndr) return NULL;
  72         ndr->current_mem_ctx = mem_ctx;
  73
  74         ndr->data = blob->data;
  75         ndr->data_size = blob->length;
  76
  77         return ndr;
  78 }
  79
  80 /*
  81   advance by 'size' bytes
  82 */
  83 _PUBLIC_ enum ndr_err_code ndr_pull_advance(struct ndr_pull *ndr, uint32_t size)
  84 {
  85         ndr->offset += size;
  86         if (ndr->offset > ndr->data_size) {
  87                 return ndr_pull_error(ndr, NDR_ERR_BUFSIZE,
  88                                       "ndr_pull_advance by %u failed",
  89                                       size);
  90         }
  91         return NDR_ERR_SUCCESS;
  92 }
  93
  94 /*
  95   set the parse offset to 'ofs'
  96 */
  97 static enum ndr_err_code ndr_pull_set_offset(struct ndr_pull *ndr, uint32_t ofs)
  98 {
  99         ndr->offset = ofs;
 100         if (ndr->offset > ndr->data_size) {
 101                 return ndr_pull_error(ndr, NDR_ERR_BUFSIZE,
 102                                       "ndr_pull_set_offset %u failed",
 103                                       ofs);
 104         }
 105         return NDR_ERR_SUCCESS;
 106 }
 107
 108 /* create a ndr_push structure, ready for some marshalling */
 109 _PUBLIC_ struct ndr_push *ndr_push_init_ctx(TALLOC_CTX *mem_ctx)
 110 {
 111         struct ndr_push *ndr;
 112
 113         ndr = talloc_zero(mem_ctx, struct ndr_push);
 114         if (!ndr) {
 115                 return NULL;
 116         }
 117
 118         ndr->flags = 0;
 119         ndr->alloc_size = NDR_BASE_MARSHALL_SIZE;
 120         ndr->data = talloc_array(ndr, uint8_t, ndr->alloc_size);
 121         if (!ndr->data) {
 122                 return NULL;
 123         }
 124
 125         return ndr;
 126 }
 127
 128 /* return a DATA_BLOB structure for the current ndr_push marshalled data */
 129 _PUBLIC_ DATA_BLOB ndr_push_blob(struct ndr_push *ndr)
 130 {
 131         DATA_BLOB blob;
 132         blob = data_blob_const(ndr->data, ndr->offset);
 133         if (ndr->alloc_size > ndr->offset) {
 134                 ndr->data[ndr->offset] = 0;
 135         }
 136         return blob;
 137 }
 138
 139
 140 /*
 141   expand the available space in the buffer to ndr->offset + extra_size
 142 */
 143 _PUBLIC_ enum ndr_err_code ndr_push_expand(struct ndr_push *ndr, uint32_t extra_size)
 144 {
 145         uint32_t size = extra_size + ndr->offset;
 146
 147         if (size < ndr->offset) {
 148                 /* extra_size overflowed the offset */
 149                 return ndr_push_error(ndr, NDR_ERR_BUFSIZE, "Overflow in push_expand to %u",
 150                                       size);
 151         }
 152
 153         if (ndr->alloc_size > size) {
 154                 return NDR_ERR_SUCCESS;
 155         }
 156
 157         ndr->alloc_size += NDR_BASE_MARSHALL_SIZE;
 158         if (size+1 > ndr->alloc_size) {
 159                 ndr->alloc_size = size+1;
 160         }
 161         ndr->data = talloc_realloc(ndr, ndr->data, uint8_t, ndr->alloc_size);
 162         if (!ndr->data) {
 163                 return ndr_push_error(ndr, NDR_ERR_ALLOC, "Failed to push_expand to %u",
 164                                       ndr->alloc_size);
 165         }
 166
 167         return NDR_ERR_SUCCESS;
 168 }
 169
 170 _PUBLIC_ void ndr_print_debug_helper(struct ndr_print *ndr, const char *format, ...)
 171 {
 172         va_list ap;
 173         char *s = NULL;
 174         uint32_t i;
 175         int ret;
 176
 177         va_start(ap, format);
 178         ret = vasprintf(&s, format, ap);
 179         va_end(ap);
 180
 181         if (ret == -1) {
 182                 return;
 183         }
 184
 185         if (ndr->no_newline) {
 186                 DEBUGADD(1,("%s", s));
 187                 free(s);
 188                 return;
 189         }
 190
 191         for (i=0;i<ndr->depth;i++) {
 192                 DEBUGADD(1,("    "));
 193         }
 194
 195         DEBUGADD(1,("%s\n", s));
 196         free(s);
 197 }
 198
 199 _PUBLIC_ void ndr_print_printf_helper(struct ndr_print *ndr, const char *format, ...)
 200 {
 201         va_list ap;
 202         uint32_t i;
 203
 204         if (!ndr->no_newline) {
 205                 for (i=0;i<ndr->depth;i++) {
 206                         printf("    ");
 207                 }
 208         }
 209
 210         va_start(ap, format);
 211         vprintf(format, ap);
 212         va_end(ap);
 213         if (!ndr->no_newline) {
 214                 printf("\n");
 215         }
 216 }
 217
 218 _PUBLIC_ void ndr_print_string_helper(struct ndr_print *ndr, const char *format, ...)
 219 {
 220         va_list ap;
 221         uint32_t i;
 222
 223         if (!ndr->no_newline) {
 224                 for (i=0;i<ndr->depth;i++) {
 225                         ndr->private_data = talloc_asprintf_append_buffer(
 226                                 (char *)ndr->private_data, "    ");
 227                 }
 228         }
 229
 230         va_start(ap, format);
 231         ndr->private_data = talloc_vasprintf_append_buffer((char *)ndr->private_data,
 232                                                     format, ap);
 233         va_end(ap);
 234         if (!ndr->no_newline) {
 235                 ndr->private_data = talloc_asprintf_append_buffer((char *)ndr->private_data,
 236                                                                   "\n");
 237         }
 238 }
 239
 240 /*
 241   a useful helper function for printing idl structures via DEBUG()
 242 */
 243 _PUBLIC_ void ndr_print_debug(ndr_print_fn_t fn, const char *name, void *ptr)
 244 {
 245         struct ndr_print *ndr;
 246
 247         DEBUG(1,(" "));
 248
 249         ndr = talloc_zero(NULL, struct ndr_print);
 250         if (!ndr) return;
 251         ndr->print = ndr_print_debug_helper;
 252         ndr->depth = 1;
 253         ndr->flags = 0;
 254         fn(ndr, name, ptr);
 255         talloc_free(ndr);
 256 }
 257
 258 /*
 259   a useful helper function for printing idl unions via DEBUG()
 260 */
 261 _PUBLIC_ void ndr_print_union_debug(ndr_print_fn_t fn, const char *name, uint32_t level, void *ptr)
 262 {
 263         struct ndr_print *ndr;
 264
 265         DEBUG(1,(" "));
 266
 267         ndr = talloc_zero(NULL, struct ndr_print);
 268         if (!ndr) return;
 269         ndr->print = ndr_print_debug_helper;
 270         ndr->depth = 1;
 271         ndr->flags = 0;
 272         ndr_print_set_switch_value(ndr, ptr, level);
 273         fn(ndr, name, ptr);
 274         talloc_free(ndr);
 275 }
 276
 277 /*
 278   a useful helper function for printing idl function calls via DEBUG()
 279 */
 280 _PUBLIC_ void ndr_print_function_debug(ndr_print_function_t fn, const char *name, int flags, void *ptr)
 281 {
 282         struct ndr_print *ndr;
 283
 284         DEBUG(1,(" "));
 285
 286         ndr = talloc_zero(NULL, struct ndr_print);
 287         if (!ndr) return;
 288         ndr->print = ndr_print_debug_helper;
 289         ndr->depth = 1;
 290         ndr->flags = 0;
 291
 292         fn(ndr, name, flags, ptr);
 293         talloc_free(ndr);
 294 }
 295
 296 /*
 297   a useful helper function for printing idl structures to a string
 298 */
 299 _PUBLIC_ char *ndr_print_struct_string(TALLOC_CTX *mem_ctx, ndr_print_fn_t fn, const char *name, void *ptr)
 300 {
 301         struct ndr_print *ndr;
 302         char *ret = NULL;
 303
 304         ndr = talloc_zero(mem_ctx, struct ndr_print);
 305         if (!ndr) return NULL;
 306         ndr->private_data = talloc_strdup(ndr, "");
 307         if (!ndr->private_data) {
 308                 goto failed;
 309         }
 310         ndr->print = ndr_print_string_helper;
 311         ndr->depth = 1;
 312         ndr->flags = 0;
 313
 314         fn(ndr, name, ptr);
 315         ret = talloc_steal(mem_ctx, (char *)ndr->private_data);
 316 failed:
 317         talloc_free(ndr);
 318         return ret;
 319 }
 320
 321 /*
 322   a useful helper function for printing idl unions to a string
 323 */
 324 _PUBLIC_ char *ndr_print_union_string(TALLOC_CTX *mem_ctx, ndr_print_fn_t fn, const char *name, uint32_t level, void *ptr)
 325 {
 326         struct ndr_print *ndr;
 327         char *ret = NULL;
 328
 329         ndr = talloc_zero(mem_ctx, struct ndr_print);
 330         if (!ndr) return NULL;
 331         ndr->private_data = talloc_strdup(ndr, "");
 332         if (!ndr->private_data) {
 333                 goto failed;
 334         }
 335         ndr->print = ndr_print_string_helper;
 336         ndr->depth = 1;
 337         ndr->flags = 0;
 338         ndr_print_set_switch_value(ndr, ptr, level);
 339         fn(ndr, name, ptr);
 340         ret = talloc_steal(mem_ctx, (char *)ndr->private_data);
 341 failed:
 342         talloc_free(ndr);
 343         return ret;
 344 }
 345
 346 /*
 347   a useful helper function for printing idl function calls to a string
 348 */
 349 _PUBLIC_ char *ndr_print_function_string(TALLOC_CTX *mem_ctx,
 350                                 ndr_print_function_t fn, const char *name,
 351                                 int flags, void *ptr)
 352 {
 353         struct ndr_print *ndr;
 354         char *ret = NULL;
 355
 356         ndr = talloc_zero(mem_ctx, struct ndr_print);
 357         if (!ndr) return NULL;
 358         ndr->private_data = talloc_strdup(ndr, "");
 359         if (!ndr->private_data) {
 360                 goto failed;
 361         }
 362         ndr->print = ndr_print_string_helper;
 363         ndr->depth = 1;
 364         ndr->flags = 0;
 365         fn(ndr, name, flags, ptr);
 366         ret = talloc_steal(mem_ctx, (char *)ndr->private_data);
 367 failed:
 368         talloc_free(ndr);
 369         return ret;
 370 }
 371
 372 _PUBLIC_ void ndr_set_flags(uint32_t *pflags, uint32_t new_flags)
 373 {
 374         /* the big/little endian flags are inter-dependent */
 375         if (new_flags & LIBNDR_FLAG_LITTLE_ENDIAN) {
 376                 (*pflags) &= ~LIBNDR_FLAG_BIGENDIAN;
 377                 (*pflags) &= ~LIBNDR_FLAG_NDR64;
 378         }
 379         if (new_flags & LIBNDR_FLAG_BIGENDIAN) {
 380                 (*pflags) &= ~LIBNDR_FLAG_LITTLE_ENDIAN;
 381                 (*pflags) &= ~LIBNDR_FLAG_NDR64;
 382         }
 383         if (new_flags & LIBNDR_FLAG_REMAINING) {
 384                 (*pflags) &= ~LIBNDR_ALIGN_FLAGS;
 385         }
 386         if (new_flags & LIBNDR_ALIGN_FLAGS) {
 387                 (*pflags) &= ~LIBNDR_FLAG_REMAINING;
 388         }
 389         if (new_flags & LIBNDR_FLAG_NO_RELATIVE_REVERSE) {
 390                 (*pflags) &= ~LIBNDR_FLAG_RELATIVE_REVERSE;
 391         }
 392         (*pflags) |= new_flags;
 393 }
 394
 395 /*
 396   return and possibly log an NDR error
 397 */
 398 _PUBLIC_ enum ndr_err_code ndr_pull_error(struct ndr_pull *ndr,
 399                                  enum ndr_err_code ndr_err,
 400                                  const char *format, ...)
 401 {
 402         char *s=NULL;
 403         va_list ap;
 404         int ret;
 405
 406         va_start(ap, format);
 407         ret = vasprintf(&s, format, ap);
 408         va_end(ap);
 409
 410         if (ret == -1) {
 411                 return NDR_ERR_ALLOC;
 412         }
 413
 414         DEBUG(1,("ndr_pull_error(%u): %s\n", ndr_err, s));
 415
 416         free(s);
 417
 418         return ndr_err;
 419 }
 420
 421 /*
 422   return and possibly log an NDR error
 423 */
 424 _PUBLIC_ enum ndr_err_code ndr_push_error(struct ndr_push *ndr,
 425                                  enum ndr_err_code ndr_err,
 426                                  const char *format, ...)
 427 {
 428         char *s=NULL;
 429         va_list ap;
 430         int ret;
 431
 432         va_start(ap, format);
 433         ret = vasprintf(&s, format, ap);
 434         va_end(ap);
 435
 436         if (ret == -1) {
 437                 return NDR_ERR_ALLOC;
 438         }
 439
 440         DEBUG(1,("ndr_push_error(%u): %s\n", ndr_err, s));
 441
 442         free(s);
 443
 444         return ndr_err;
 445 }
 446
 447 /*
 448   handle subcontext buffers, which in midl land are user-marshalled, but
 449   we use magic in pidl to make them easier to cope with
 450 */
 451 _PUBLIC_ enum ndr_err_code ndr_pull_subcontext_start(struct ndr_pull *ndr,
 452                                    struct ndr_pull **_subndr,
 453                                    size_t header_size,
 454                                    ssize_t size_is)
 455 {
 456         struct ndr_pull *subndr;
 457         uint32_t r_content_size;
 458         bool force_le = false;
 459         bool force_be = false;
 460
 461         switch (header_size) {
 462         case 0: {
 463                 uint32_t content_size = ndr->data_size - ndr->offset;
 464                 if (size_is >= 0) {
 465                         content_size = size_is;
 466                 }
 467                 r_content_size = content_size;
 468                 break;
 469         }
 470
 471         case 2: {
 472                 uint16_t content_size;
 473                 NDR_CHECK(ndr_pull_uint16(ndr, NDR_SCALARS, &content_size));
 474                 if (size_is >= 0 && size_is != content_size) {
 475                         return ndr_pull_error(ndr, NDR_ERR_SUBCONTEXT, "Bad subcontext (PULL) size_is(%d) mismatch content_size %d",
 476                                                 (int)size_is, (int)content_size);
 477                 }
 478                 r_content_size = content_size;
 479                 break;
 480         }
 481
 482         case 4: {
 483                 uint32_t content_size;
 484                 NDR_CHECK(ndr_pull_uint3264(ndr, NDR_SCALARS, &content_size));
 485                 if (size_is >= 0 && size_is != content_size) {
 486                         return ndr_pull_error(ndr, NDR_ERR_SUBCONTEXT, "Bad subcontext (PULL) size_is(%d) mismatch content_size %d",
 487                                                 (int)size_is, (int)content_size);
 488                 }
 489                 r_content_size = content_size;
 490                 break;
 491         }
 492         case 0xFFFFFC01: {
 493                 /*
 494                  * Common Type Header for the Serialization Stream
 495                  * See [MS-RPCE] 2.2.6 Type Serialization Version 1
 496                  */
 497                 uint8_t version;
 498                 uint8_t drep;
 499                 uint16_t hdrlen;
 500                 uint32_t filler;
 501                 uint32_t content_size;
 502                 uint32_t reserved;
 503
 504                 /* version */
 505                 NDR_CHECK(ndr_pull_uint8(ndr, NDR_SCALARS, &version));
 506
 507                 if (version != 1) {
 508                         return ndr_pull_error(ndr, NDR_ERR_SUBCONTEXT,
 509                                               "Bad subcontext (PULL) Common Type Header version %d != 1",
 510                                               (int)version);
 511                 }
 512
 513                 /*
 514                  * 0x10 little endian
 515                  * 0x00 big endian
 516                  */
 517                 NDR_CHECK(ndr_pull_uint8(ndr, NDR_SCALARS, &drep));
 518                 if (drep == 0x10) {
 519                         force_le = true;
 520                 } else if (drep == 0x00) {
 521                         force_be = true;
 522                 } else {
 523                         return ndr_pull_error(ndr, NDR_ERR_SUBCONTEXT,
 524                                               "Bad subcontext (PULL) Common Type Header invalid drep 0x%02X",
 525                                               (unsigned int)drep);
 526                 }
 527
 528                 /* length of the "Private Header for Constructed Type" */
 529                 NDR_CHECK(ndr_pull_uint16(ndr, NDR_SCALARS, &hdrlen));
 530                 if (hdrlen != 8) {
 531                         return ndr_pull_error(ndr, NDR_ERR_SUBCONTEXT,
 532                                               "Bad subcontext (PULL) Common Type Header length %d != 8",
 533                                               (int)hdrlen);
 534                 }
 535
 536                 /* filler should be ignored */
 537                 NDR_CHECK(ndr_pull_uint32(ndr, NDR_SCALARS, &filler));
 538
 539                 /*
 540                  * Private Header for Constructed Type
 541                  */
 542                 /* length - will be updated latter */
 543                 NDR_CHECK(ndr_pull_uint32(ndr, NDR_SCALARS, &content_size));
 544                 if (size_is >= 0 && size_is != content_size) {
 545                         return ndr_pull_error(ndr, NDR_ERR_SUBCONTEXT, "Bad subcontext (PULL) size_is(%d) mismatch content_size %d",
 546                                               (int)size_is, (int)content_size);
 547                 }
 548                 /* the content size must be a multiple of 8 */
 549                 if ((content_size % 8) != 0) {
 550                         return ndr_pull_error(ndr, NDR_ERR_SUBCONTEXT,
 551                                               "Bad subcontext (PULL) size_is(%d) not padded to 8 content_size %d",
 552                                               (int)size_is, (int)content_size);
 553                 }
 554                 r_content_size = content_size;
 555
 556                 /* reserved */
 557                 NDR_CHECK(ndr_pull_uint32(ndr, NDR_SCALARS, &reserved));
 558                 break;
 559         }
 560         default:
 561                 return ndr_pull_error(ndr, NDR_ERR_SUBCONTEXT, "Bad subcontext (PULL) header_size %d",
 562                                       (int)header_size);
 563         }
 564
 565         NDR_PULL_NEED_BYTES(ndr, r_content_size);
 566
 567         subndr = talloc_zero(ndr, struct ndr_pull);
 568         NDR_ERR_HAVE_NO_MEMORY(subndr);
 569         subndr->flags           = ndr->flags & ~LIBNDR_FLAG_NDR64;
 570         subndr->current_mem_ctx = ndr->current_mem_ctx;
 571
 572         subndr->data = ndr->data + ndr->offset;
 573         subndr->offset = 0;
 574         subndr->data_size = r_content_size;
 575
 576         if (force_le) {
 577                 ndr_set_flags(&ndr->flags, LIBNDR_FLAG_LITTLE_ENDIAN);
 578         } else if (force_be) {
 579                 ndr_set_flags(&ndr->flags, LIBNDR_FLAG_BIGENDIAN);
 580         }
 581
 582         *_subndr = subndr;
 583         return NDR_ERR_SUCCESS;
 584 }
 585
 586 _PUBLIC_ enum ndr_err_code ndr_pull_subcontext_end(struct ndr_pull *ndr,
 587                                  struct ndr_pull *subndr,
 588                                  size_t header_size,
 589                                  ssize_t size_is)
 590 {
 591         uint32_t advance;
 592         if (size_is >= 0) {
 593                 advance = size_is;
 594         } else if (header_size > 0) {
 595                 advance = subndr->data_size;
 596         } else {
 597                 advance = subndr->offset;
 598         }
 599         NDR_CHECK(ndr_pull_advance(ndr, advance));
 600         return NDR_ERR_SUCCESS;
 601 }
 602
 603 _PUBLIC_ enum ndr_err_code ndr_push_subcontext_start(struct ndr_push *ndr,
 604                                    struct ndr_push **_subndr,
 605                                    size_t header_size,
 606                                    ssize_t size_is)
 607 {
 608         struct ndr_push *subndr;
 609
 610         subndr = ndr_push_init_ctx(ndr);
 611         NDR_ERR_HAVE_NO_MEMORY(subndr);
 612         subndr->flags   = ndr->flags & ~LIBNDR_FLAG_NDR64;
 613
 614         if (size_is > 0) {
 615                 NDR_CHECK(ndr_push_zero(subndr, size_is));
 616                 subndr->offset = 0;
 617                 subndr->relative_end_offset = size_is;
 618         }
 619
 620         *_subndr = subndr;
 621         return NDR_ERR_SUCCESS;
 622 }
 623
 624 /*
 625   push a subcontext header
 626 */
 627 _PUBLIC_ enum ndr_err_code ndr_push_subcontext_end(struct ndr_push *ndr,
 628                                  struct ndr_push *subndr,
 629                                  size_t header_size,
 630                                  ssize_t size_is)
 631 {
 632         ssize_t padding_len;
 633
 634         if (size_is >= 0) {
 635                 padding_len = size_is - subndr->offset;
 636                 if (padding_len < 0) {
 637                         return ndr_push_error(ndr, NDR_ERR_SUBCONTEXT, "Bad subcontext (PUSH) content_size %d is larger than size_is(%d)",
 638                                               (int)subndr->offset, (int)size_is);
 639                 }
 640                 subndr->offset = size_is;
 641         }
 642
 643         switch (header_size) {
 644         case 0:
 645                 break;
 646
 647         case 2:
 648                 NDR_CHECK(ndr_push_uint16(ndr, NDR_SCALARS, subndr->offset));
 649                 break;
 650
 651         case 4:
 652                 NDR_CHECK(ndr_push_uint3264(ndr, NDR_SCALARS, subndr->offset));
 653                 break;
 654
 655         case 0xFFFFFC01:
 656                 /*
 657                  * Common Type Header for the Serialization Stream
 658                  * See [MS-RPCE] 2.2.6 Type Serialization Version 1
 659                  */
 660                 padding_len = NDR_ROUND(subndr->offset, 8) - subndr->offset;
 661                 if (padding_len > 0) {
 662                         NDR_CHECK(ndr_push_zero(subndr, padding_len));
 663                 }
 664
 665                 /* version */
 666                 NDR_CHECK(ndr_push_uint8(ndr, NDR_SCALARS, 1));
 667
 668                 /*
 669                  * 0x10 little endian
 670                  * 0x00 big endian
 671                  */
 672                 NDR_CHECK(ndr_push_uint8(ndr, NDR_SCALARS, NDR_BE(ndr)?0x00:0x10));
 673
 674                 /* length of the "Private Header for Constructed Type" */
 675                 NDR_CHECK(ndr_push_uint16(ndr, NDR_SCALARS, 8));
 676
 677                 /* filler */
 678                 NDR_CHECK(ndr_push_uint32(ndr, NDR_SCALARS, 0xCCCCCCCC));
 679
 680                 /*
 681                  * Private Header for Constructed Type
 682                  */
 683                 /* length - will be updated latter */
 684                 NDR_CHECK(ndr_push_uint32(ndr, NDR_SCALARS, subndr->offset));
 685
 686                 /* reserved */
 687                 NDR_CHECK(ndr_push_uint32(ndr, NDR_SCALARS, 0));
 688                 break;
 689
 690         default:
 691                 return ndr_push_error(ndr, NDR_ERR_SUBCONTEXT, "Bad subcontext header size %d",
 692                                       (int)header_size);
 693         }
 694
 695         NDR_CHECK(ndr_push_bytes(ndr, subndr->data, subndr->offset));
 696         return NDR_ERR_SUCCESS;
 697 }
 698
 699 /*
 700   store a token in the ndr context, for later retrieval
 701 */
 702 _PUBLIC_ enum ndr_err_code ndr_token_store(TALLOC_CTX *mem_ctx,
 703                          struct ndr_token_list **list,
 704                          const void *key,
 705                          uint32_t value)
 706 {
 707         struct ndr_token_list *tok;
 708         tok = talloc(mem_ctx, struct ndr_token_list);
 709         NDR_ERR_HAVE_NO_MEMORY(tok);
 710         tok->key = key;
 711         tok->value = value;
 712         DLIST_ADD((*list), tok);
 713         return NDR_ERR_SUCCESS;
 714 }
 715
 716 /*
 717   retrieve a token from a ndr context, using cmp_fn to match the tokens
 718 */
 719 _PUBLIC_ enum ndr_err_code ndr_token_retrieve_cmp_fn(struct ndr_token_list **list, const void *key, uint32_t *v,
 720                                    comparison_fn_t _cmp_fn, bool _remove_tok)
 721 {
 722         struct ndr_token_list *tok;
 723         for (tok=*list;tok;tok=tok->next) {
 724                 if (_cmp_fn && _cmp_fn(tok->key,key)==0) goto found;
 725                 else if (!_cmp_fn && tok->key == key) goto found;
 726         }
 727         return NDR_ERR_TOKEN;
 728 found:
 729         *v = tok->value;
 730         if (_remove_tok) {
 731                 DLIST_REMOVE((*list), tok);
 732                 talloc_free(tok);
 733         }
 734         return NDR_ERR_SUCCESS;
 735 }
 736
 737 /*
 738   retrieve a token from a ndr context
 739 */
 740 _PUBLIC_ enum ndr_err_code ndr_token_retrieve(struct ndr_token_list **list, const void *key, uint32_t *v)
 741 {
 742         return ndr_token_retrieve_cmp_fn(list, key, v, NULL, true);
 743 }
 744
 745 /*
 746   peek at but don't removed a token from a ndr context
 747 */
 748 _PUBLIC_ uint32_t ndr_token_peek(struct ndr_token_list **list, const void *key)
 749 {
 750         enum ndr_err_code status;
 751         uint32_t v;
 752
 753         status = ndr_token_retrieve_cmp_fn(list, key, &v, NULL, false);
 754         if (!NDR_ERR_CODE_IS_SUCCESS(status)) {
 755                 return 0;
 756         }
 757
 758         return v;
 759 }
 760
 761 /*
 762   pull an array size field and add it to the array_size_list token list
 763 */
 764 _PUBLIC_ enum ndr_err_code ndr_pull_array_size(struct ndr_pull *ndr, const void *p)
 765 {
 766         uint32_t size;
 767         NDR_CHECK(ndr_pull_uint3264(ndr, NDR_SCALARS, &size));
 768         return ndr_token_store(ndr, &ndr->array_size_list, p, size);
 769 }
 770
 771 /*
 772   get the stored array size field
 773 */
 774 _PUBLIC_ uint32_t ndr_get_array_size(struct ndr_pull *ndr, const void *p)
 775 {
 776         return ndr_token_peek(&ndr->array_size_list, p);
 777 }
 778
 779 /*
 780   check the stored array size field
 781 */
 782 _PUBLIC_ enum ndr_err_code ndr_check_array_size(struct ndr_pull *ndr, void *p, uint32_t size)
 783 {
 784         uint32_t stored;
 785         stored = ndr_token_peek(&ndr->array_size_list, p);
 786         if (stored != size) {
 787                 return ndr_pull_error(ndr, NDR_ERR_ARRAY_SIZE,
 788                                       "Bad array size - got %u expected %u\n",
 789                                       stored, size);
 790         }
 791         return NDR_ERR_SUCCESS;
 792 }
 793
 794 /*
 795   pull an array length field and add it to the array_length_list token list
 796 */
 797 _PUBLIC_ enum ndr_err_code ndr_pull_array_length(struct ndr_pull *ndr, const void *p)
 798 {
 799         uint32_t length, offset;
 800         NDR_CHECK(ndr_pull_uint3264(ndr, NDR_SCALARS, &offset));
 801         if (offset != 0) {
 802                 return ndr_pull_error(ndr, NDR_ERR_ARRAY_SIZE,
 803                                       "non-zero array offset %u\n", offset);
 804         }
 805         NDR_CHECK(ndr_pull_uint3264(ndr, NDR_SCALARS, &length));
 806         return ndr_token_store(ndr, &ndr->array_length_list, p, length);
 807 }
 808
 809 /*
 810   get the stored array length field
 811 */
 812 _PUBLIC_ uint32_t ndr_get_array_length(struct ndr_pull *ndr, const void *p)
 813 {
 814         return ndr_token_peek(&ndr->array_length_list, p);
 815 }
 816
 817 /*
 818   check the stored array length field
 819 */
 820 _PUBLIC_ enum ndr_err_code ndr_check_array_length(struct ndr_pull *ndr, void *p, uint32_t length)
 821 {
 822         uint32_t stored;
 823         stored = ndr_token_peek(&ndr->array_length_list, p);
 824         if (stored != length) {
 825                 return ndr_pull_error(ndr, NDR_ERR_ARRAY_SIZE,
 826                                       "Bad array length - got %u expected %u\n",
 827                                       stored, length);
 828         }
 829         return NDR_ERR_SUCCESS;
 830 }
 831
 832 /*
 833   store a switch value
 834  */
 835 _PUBLIC_ enum ndr_err_code ndr_push_set_switch_value(struct ndr_push *ndr, const void *p, uint32_t val)
 836 {
 837         return ndr_token_store(ndr, &ndr->switch_list, p, val);
 838 }
 839
 840 _PUBLIC_ enum ndr_err_code ndr_pull_set_switch_value(struct ndr_pull *ndr, const void *p, uint32_t val)
 841 {
 842         return ndr_token_store(ndr, &ndr->switch_list, p, val);
 843 }
 844
 845 _PUBLIC_ enum ndr_err_code ndr_print_set_switch_value(struct ndr_print *ndr, const void *p, uint32_t val)
 846 {
 847         return ndr_token_store(ndr, &ndr->switch_list, p, val);
 848 }
 849
 850 /*
 851   retrieve a switch value
 852  */
 853 _PUBLIC_ uint32_t ndr_push_get_switch_value(struct ndr_push *ndr, const void *p)
 854 {
 855         return ndr_token_peek(&ndr->switch_list, p);
 856 }
 857
 858 _PUBLIC_ uint32_t ndr_pull_get_switch_value(struct ndr_pull *ndr, const void *p)
 859 {
 860         return ndr_token_peek(&ndr->switch_list, p);
 861 }
 862
 863 _PUBLIC_ uint32_t ndr_print_get_switch_value(struct ndr_print *ndr, const void *p)
 864 {
 865         return ndr_token_peek(&ndr->switch_list, p);
 866 }
 867
 868 /*
 869   pull a struct from a blob using NDR
 870 */
 871 _PUBLIC_ enum ndr_err_code ndr_pull_struct_blob(const DATA_BLOB *blob, TALLOC_CTX *mem_ctx, void *p,
 872                               ndr_pull_flags_fn_t fn)
 873 {
 874         struct ndr_pull *ndr;
 875         ndr = ndr_pull_init_blob(blob, mem_ctx);
 876         NDR_ERR_HAVE_NO_MEMORY(ndr);
 877         NDR_CHECK_FREE(fn(ndr, NDR_SCALARS|NDR_BUFFERS, p));
 878         talloc_free(ndr);
 879         return NDR_ERR_SUCCESS;
 880 }
 881
 882 /*
 883   pull a struct from a blob using NDR - failing if all bytes are not consumed
 884 */
 885 _PUBLIC_ enum ndr_err_code ndr_pull_struct_blob_all(const DATA_BLOB *blob, TALLOC_CTX *mem_ctx,
 886                                                     void *p, ndr_pull_flags_fn_t fn)
 887 {
 888         struct ndr_pull *ndr;
 889         uint32_t highest_ofs;
 890         ndr = ndr_pull_init_blob(blob, mem_ctx);
 891         NDR_ERR_HAVE_NO_MEMORY(ndr);
 892         NDR_CHECK_FREE(fn(ndr, NDR_SCALARS|NDR_BUFFERS, p));
 893         if (ndr->offset > ndr->relative_highest_offset) {
 894                 highest_ofs = ndr->offset;
 895         } else {
 896                 highest_ofs = ndr->relative_highest_offset;
 897         }
 898         if (highest_ofs < ndr->data_size) {
 899                 enum ndr_err_code ret;
 900                 ret = ndr_pull_error(ndr, NDR_ERR_UNREAD_BYTES,
 901                                      "not all bytes consumed ofs[%u] size[%u]",
 902                                      highest_ofs, ndr->data_size);
 903                 talloc_free(ndr);
 904                 return ret;
 905         }
 906         talloc_free(ndr);
 907         return NDR_ERR_SUCCESS;
 908 }
 909
 910 /*
 911   pull a union from a blob using NDR, given the union discriminator
 912 */
 913 _PUBLIC_ enum ndr_err_code ndr_pull_union_blob(const DATA_BLOB *blob, TALLOC_CTX *mem_ctx,
 914                                                void *p,
 915                              uint32_t level, ndr_pull_flags_fn_t fn)
 916 {
 917         struct ndr_pull *ndr;
 918         ndr = ndr_pull_init_blob(blob, mem_ctx);
 919         NDR_ERR_HAVE_NO_MEMORY(ndr);
 920         NDR_CHECK_FREE(ndr_pull_set_switch_value(ndr, p, level));
 921         NDR_CHECK_FREE(fn(ndr, NDR_SCALARS|NDR_BUFFERS, p));
 922         talloc_free(ndr);
 923         return NDR_ERR_SUCCESS;
 924 }
 925
 926 /*
 927   pull a union from a blob using NDR, given the union discriminator,
 928   failing if all bytes are not consumed
 929 */
 930 _PUBLIC_ enum ndr_err_code ndr_pull_union_blob_all(const DATA_BLOB *blob, TALLOC_CTX *mem_ctx,
 931                                                    void *p,
 932                              uint32_t level, ndr_pull_flags_fn_t fn)
 933 {
 934         struct ndr_pull *ndr;
 935         uint32_t highest_ofs;
 936         ndr = ndr_pull_init_blob(blob, mem_ctx);
 937         NDR_ERR_HAVE_NO_MEMORY(ndr);
 938         NDR_CHECK_FREE(ndr_pull_set_switch_value(ndr, p, level));
 939         NDR_CHECK_FREE(fn(ndr, NDR_SCALARS|NDR_BUFFERS, p));
 940         if (ndr->offset > ndr->relative_highest_offset) {
 941                 highest_ofs = ndr->offset;
 942         } else {
 943                 highest_ofs = ndr->relative_highest_offset;
 944         }
 945         if (highest_ofs < ndr->data_size) {
 946                 enum ndr_err_code ret;
 947                 ret = ndr_pull_error(ndr, NDR_ERR_UNREAD_BYTES,
 948                                      "not all bytes consumed ofs[%u] size[%u]",
 949                                      highest_ofs, ndr->data_size);
 950                 talloc_free(ndr);
 951                 return ret;
 952         }
 953         talloc_free(ndr);
 954         return NDR_ERR_SUCCESS;
 955 }
 956
 957 /*
 958   push a struct to a blob using NDR
 959 */
 960 _PUBLIC_ enum ndr_err_code ndr_push_struct_blob(DATA_BLOB *blob, TALLOC_CTX *mem_ctx, const void *p, ndr_push_flags_fn_t fn)
 961 {
 962         struct ndr_push *ndr;
 963         ndr = ndr_push_init_ctx(mem_ctx);
 964         NDR_ERR_HAVE_NO_MEMORY(ndr);
 965
 966         NDR_CHECK(fn(ndr, NDR_SCALARS|NDR_BUFFERS, p));
 967
 968         *blob = ndr_push_blob(ndr);
 969         talloc_steal(mem_ctx, blob->data);
 970         talloc_free(ndr);
 971
 972         return NDR_ERR_SUCCESS;
 973 }
 974
 975 /*
 976   push a union to a blob using NDR
 977 */
 978 _PUBLIC_ enum ndr_err_code ndr_push_union_blob(DATA_BLOB *blob, TALLOC_CTX *mem_ctx, void *p,
 979                              uint32_t level, ndr_push_flags_fn_t fn)
 980 {
 981         struct ndr_push *ndr;
 982         ndr = ndr_push_init_ctx(mem_ctx);
 983         NDR_ERR_HAVE_NO_MEMORY(ndr);
 984
 985         NDR_CHECK(ndr_push_set_switch_value(ndr, p, level));
 986         NDR_CHECK(fn(ndr, NDR_SCALARS|NDR_BUFFERS, p));
 987
 988         *blob = ndr_push_blob(ndr);
 989         talloc_steal(mem_ctx, blob->data);
 990         talloc_free(ndr);
 991
 992         return NDR_ERR_SUCCESS;
 993 }
 994
 995 /*
 996   generic ndr_size_*() handler for structures
 997 */
 998 _PUBLIC_ size_t ndr_size_struct(const void *p, int flags, ndr_push_flags_fn_t push)
 999 {
1000         struct ndr_push *ndr;
1001         enum ndr_err_code status;
1002         size_t ret;
1003
1004         /* avoid recursion */
1005         if (flags & LIBNDR_FLAG_NO_NDR_SIZE) return 0;
1006
1007         ndr = ndr_push_init_ctx(NULL);
1008         if (!ndr) return 0;
1009         ndr->flags |= flags | LIBNDR_FLAG_NO_NDR_SIZE;
1010         status = push(ndr, NDR_SCALARS|NDR_BUFFERS, discard_const(p));
1011         if (!NDR_ERR_CODE_IS_SUCCESS(status)) {
1012                 talloc_free(ndr);
1013                 return 0;
1014         }
1015         ret = ndr->offset;
1016         talloc_free(ndr);
1017         return ret;
1018 }
1019
1020 /*
1021   generic ndr_size_*() handler for unions
1022 */
1023 _PUBLIC_ size_t ndr_size_union(const void *p, int flags, uint32_t level, ndr_push_flags_fn_t push)
1024 {
1025         struct ndr_push *ndr;
1026         enum ndr_err_code status;
1027         size_t ret;
1028
1029         /* avoid recursion */
1030         if (flags & LIBNDR_FLAG_NO_NDR_SIZE) return 0;
1031
1032         ndr = ndr_push_init_ctx(NULL);
1033         if (!ndr) return 0;
1034         ndr->flags |= flags | LIBNDR_FLAG_NO_NDR_SIZE;
1035
1036         status = ndr_push_set_switch_value(ndr, p, level);
1037         if (!NDR_ERR_CODE_IS_SUCCESS(status)) {
1038                 talloc_free(ndr);
1039                 return 0;
1040         }
1041         status = push(ndr, NDR_SCALARS|NDR_BUFFERS, p);
1042         if (!NDR_ERR_CODE_IS_SUCCESS(status)) {
1043                 talloc_free(ndr);
1044                 return 0;
1045         }
1046         ret = ndr->offset;
1047         talloc_free(ndr);
1048         return ret;
1049 }
1050
1051 /*
1052   get the current base for relative pointers for the push
1053 */
1054 _PUBLIC_ uint32_t ndr_push_get_relative_base_offset(struct ndr_push *ndr)
1055 {
1056         return ndr->relative_base_offset;
1057 }
1058
1059 /*
1060   restore the old base for relative pointers for the push
1061 */
1062 _PUBLIC_ void ndr_push_restore_relative_base_offset(struct ndr_push *ndr, uint32_t offset)
1063 {
1064         ndr->relative_base_offset = offset;
1065 }
1066
1067 /*
1068   setup the current base for relative pointers for the push
1069   called in the NDR_SCALAR stage
1070 */
1071 _PUBLIC_ enum ndr_err_code ndr_push_setup_relative_base_offset1(struct ndr_push *ndr, const void *p, uint32_t offset)
1072 {
1073         ndr->relative_base_offset = offset;
1074         return ndr_token_store(ndr, &ndr->relative_base_list, p, offset);
1075 }
1076
1077 /*
1078   setup the current base for relative pointers for the push
1079   called in the NDR_BUFFERS stage
1080 */
1081 _PUBLIC_ enum ndr_err_code ndr_push_setup_relative_base_offset2(struct ndr_push *ndr, const void *p)
1082 {
1083         return ndr_token_retrieve(&ndr->relative_base_list, p, &ndr->relative_base_offset);
1084 }
1085
1086 /*
1087   push a relative object - stage1
1088   this is called during SCALARS processing
1089 */
1090 _PUBLIC_ enum ndr_err_code ndr_push_relative_ptr1(struct ndr_push *ndr, const void *p)
1091 {
1092         if (p == NULL) {
1093                 NDR_CHECK(ndr_push_uint32(ndr, NDR_SCALARS, 0));
1094                 return NDR_ERR_SUCCESS;
1095         }
1096         NDR_CHECK(ndr_push_align(ndr, 4));
1097         NDR_CHECK(ndr_token_store(ndr, &ndr->relative_list, p, ndr->offset));
1098         return ndr_push_uint32(ndr, NDR_SCALARS, 0xFFFFFFFF);
1099 }
1100
1101 /*
1102   push a short relative object - stage1
1103   this is called during SCALARS processing
1104 */
1105 _PUBLIC_ enum ndr_err_code ndr_push_short_relative_ptr1(struct ndr_push *ndr, const void *p)
1106 {
1107         if (p == NULL) {
1108                 NDR_CHECK(ndr_push_uint16(ndr, NDR_SCALARS, 0));
1109                 return NDR_ERR_SUCCESS;
1110         }
1111         NDR_CHECK(ndr_push_align(ndr, 2));
1112         NDR_CHECK(ndr_token_store(ndr, &ndr->relative_list, p, ndr->offset));
1113         return ndr_push_uint16(ndr, NDR_SCALARS, 0xFFFF);
1114 }
1115 /*
1116   push a relative object - stage2
1117   this is called during buffers processing
1118 */
1119 static enum ndr_err_code ndr_push_relative_ptr2(struct ndr_push *ndr, const void *p)
1120 {
1121         uint32_t save_offset;
1122         uint32_t ptr_offset = 0xFFFFFFFF;
1123         if (p == NULL) {
1124                 return NDR_ERR_SUCCESS;
1125         }
1126         save_offset = ndr->offset;
1127         NDR_CHECK(ndr_token_retrieve(&ndr->relative_list, p, &ptr_offset));
1128         if (ptr_offset > ndr->offset) {
1129                 return ndr_push_error(ndr, NDR_ERR_BUFSIZE,
1130                                       "ndr_push_relative_ptr2 ptr_offset(%u) > ndr->offset(%u)",
1131                                       ptr_offset, ndr->offset);
1132         }
1133         ndr->offset = ptr_offset;
1134         if (save_offset < ndr->relative_base_offset) {
1135                 return ndr_push_error(ndr, NDR_ERR_BUFSIZE,
1136                                       "ndr_push_relative_ptr2 save_offset(%u) < ndr->relative_base_offset(%u)",
1137                                       save_offset, ndr->relative_base_offset);
1138         }
1139         NDR_CHECK(ndr_push_uint32(ndr, NDR_SCALARS, save_offset - ndr->relative_base_offset));
1140         ndr->offset = save_offset;
1141         return NDR_ERR_SUCCESS;
1142 }
1143 /*
1144   push a short relative object - stage2
1145   this is called during buffers processing
1146 */
1147 _PUBLIC_ enum ndr_err_code ndr_push_short_relative_ptr2(struct ndr_push *ndr, const void *p)
1148 {
1149         uint32_t save_offset;
1150         uint32_t ptr_offset = 0xFFFF;
1151         if (p == NULL) {
1152                 return NDR_ERR_SUCCESS;
1153         }
1154         save_offset = ndr->offset;
1155         NDR_CHECK(ndr_token_retrieve(&ndr->relative_list, p, &ptr_offset));
1156         if (ptr_offset > ndr->offset) {
1157                 return ndr_push_error(ndr, NDR_ERR_BUFSIZE,
1158                                       "ndr_push_short_relative_ptr2 ptr_offset(%u) > ndr->offset(%u)",
1159                                       ptr_offset, ndr->offset);
1160         }
1161         ndr->offset = ptr_offset;
1162         if (save_offset < ndr->relative_base_offset) {
1163                 return ndr_push_error(ndr, NDR_ERR_BUFSIZE,
1164                                       "ndr_push_relative_ptr2 save_offset(%u) < ndr->relative_base_offset(%u)",
1165                                       save_offset, ndr->relative_base_offset);
1166         }
1167         NDR_CHECK(ndr_push_uint16(ndr, NDR_SCALARS, save_offset - ndr->relative_base_offset));
1168         ndr->offset = save_offset;
1169         return NDR_ERR_SUCCESS;
1170 }
1171
1172 /*
1173   push a relative object - stage2 start
1174   this is called during buffers processing
1175 */
1176 _PUBLIC_ enum ndr_err_code ndr_push_relative_ptr2_start(struct ndr_push *ndr, const void *p)
1177 {
1178         if (p == NULL) {
1179                 return NDR_ERR_SUCCESS;
1180         }
1181         if (!(ndr->flags & LIBNDR_FLAG_RELATIVE_REVERSE)) {
1182                 return ndr_push_relative_ptr2(ndr, p);
1183         }
1184         if (ndr->relative_end_offset == -1) {
1185                 return ndr_push_error(ndr, NDR_ERR_RELATIVE,
1186                               "ndr_push_relative_ptr2_start RELATIVE_REVERSE flag set and relative_end_offset %d",
1187                               ndr->relative_end_offset);
1188         }
1189         NDR_CHECK(ndr_token_store(ndr, &ndr->relative_begin_list, p, ndr->offset));
1190         return NDR_ERR_SUCCESS;
1191 }
1192
1193 /*
1194   push a relative object - stage2 end
1195   this is called during buffers processing
1196 */
1197 _PUBLIC_ enum ndr_err_code ndr_push_relative_ptr2_end(struct ndr_push *ndr, const void *p)
1198 {
1199         uint32_t begin_offset = 0xFFFFFFFF;
1200         ssize_t len;
1201         uint32_t correct_offset = 0;
1202         uint32_t align = 1;
1203         uint32_t pad = 0;
1204
1205         if (p == NULL) {
1206                 return NDR_ERR_SUCCESS;
1207         }
1208
1209         if (!(ndr->flags & LIBNDR_FLAG_RELATIVE_REVERSE)) {
1210                 return NDR_ERR_SUCCESS;
1211         }
1212
1213         if (ndr->flags & LIBNDR_FLAG_NO_NDR_SIZE) {
1214                 /* better say more than calculation a too small buffer */
1215                 NDR_PUSH_ALIGN(ndr, 8);
1216                 return NDR_ERR_SUCCESS;
1217         }
1218
1219         if (ndr->relative_end_offset < ndr->offset) {
1220                 return ndr_push_error(ndr, NDR_ERR_RELATIVE,
1221                                       "ndr_push_relative_ptr2_end:"
1222                                       "relative_end_offset %u < offset %u",
1223                                       ndr->relative_end_offset, ndr->offset);
1224         }
1225
1226         NDR_CHECK(ndr_token_retrieve(&ndr->relative_begin_list, p, &begin_offset));
1227
1228         /* we have marshalled a buffer, see how long it was */
1229         len = ndr->offset - begin_offset;
1230
1231         if (len < 0) {
1232                 return ndr_push_error(ndr, NDR_ERR_RELATIVE,
1233                                       "ndr_push_relative_ptr2_end:"
1234                                       "offset %u - begin_offset %u < 0",
1235                                       ndr->offset, begin_offset);
1236         }
1237
1238         if (ndr->relative_end_offset < len) {
1239                 return ndr_push_error(ndr, NDR_ERR_RELATIVE,
1240                                       "ndr_push_relative_ptr2_end:"
1241                                       "relative_end_offset %u < len %lld",
1242                                       ndr->offset, (long long)len);
1243         }
1244
1245         /* the reversed offset is at the end of the main buffer */
1246         correct_offset = ndr->relative_end_offset - len;
1247
1248         /* TODO: remove this hack and let the idl use FLAG_ALIGN2 explicit */
1249         align = 2;
1250
1251         if (ndr->flags & LIBNDR_FLAG_ALIGN2) {
1252                 align = 2;
1253         } else if (ndr->flags & LIBNDR_FLAG_ALIGN4) {
1254                 align = 4;
1255         } else if (ndr->flags & LIBNDR_FLAG_ALIGN8) {
1256                 align = 8;
1257         }
1258
1259         pad = ndr_align_size(correct_offset, align);
1260         if (pad) {
1261                 correct_offset += pad;
1262                 correct_offset -= align;
1263         }
1264
1265         if (correct_offset < begin_offset) {
1266                 return ndr_push_error(ndr, NDR_ERR_RELATIVE,
1267                                       "ndr_push_relative_ptr2_end: "
1268                                       "correct_offset %u < begin_offset %u",
1269                                       correct_offset, begin_offset);
1270         }
1271
1272         if (len > 0) {
1273                 uint32_t clear_size = correct_offset - begin_offset;
1274
1275                 clear_size = MIN(clear_size, len);
1276
1277                 /* now move the marshalled buffer to the end of the main buffer */
1278                 memmove(ndr->data + correct_offset, ndr->data + begin_offset, len);
1279
1280                 if (clear_size) {
1281                         /* and wipe out old buffer within the main buffer */
1282                         memset(ndr->data + begin_offset, '\0', clear_size);
1283                 }
1284         }
1285
1286         /* and set the end offset for the next buffer */
1287         ndr->relative_end_offset = correct_offset;
1288
1289         /* finally write the offset to the main buffer */
1290         ndr->offset = correct_offset;
1291         NDR_CHECK(ndr_push_relative_ptr2(ndr, p));
1292
1293         /* restore to where we were in the main buffer */
1294         ndr->offset = begin_offset;
1295
1296         return NDR_ERR_SUCCESS;
1297 }
1298
1299 /*
1300   get the current base for relative pointers for the pull
1301 */
1302 _PUBLIC_ uint32_t ndr_pull_get_relative_base_offset(struct ndr_pull *ndr)
1303 {
1304         return ndr->relative_base_offset;
1305 }
1306
1307 /*
1308   restore the old base for relative pointers for the pull
1309 */
1310 _PUBLIC_ void ndr_pull_restore_relative_base_offset(struct ndr_pull *ndr, uint32_t offset)
1311 {
1312         ndr->relative_base_offset = offset;
1313 }
1314
1315 /*
1316   setup the current base for relative pointers for the pull
1317   called in the NDR_SCALAR stage
1318 */
1319 _PUBLIC_ enum ndr_err_code ndr_pull_setup_relative_base_offset1(struct ndr_pull *ndr, const void *p, uint32_t offset)
1320 {
1321         ndr->relative_base_offset = offset;
1322         return ndr_token_store(ndr, &ndr->relative_base_list, p, offset);
1323 }
1324
1325 /*
1326   setup the current base for relative pointers for the pull
1327   called in the NDR_BUFFERS stage
1328 */
1329 _PUBLIC_ enum ndr_err_code ndr_pull_setup_relative_base_offset2(struct ndr_pull *ndr, const void *p)
1330 {
1331         return ndr_token_retrieve(&ndr->relative_base_list, p, &ndr->relative_base_offset);
1332 }
1333
1334 /*
1335   pull a relative object - stage1
1336   called during SCALARS processing
1337 */
1338 _PUBLIC_ enum ndr_err_code ndr_pull_relative_ptr1(struct ndr_pull *ndr, const void *p, uint32_t rel_offset)
1339 {
1340         rel_offset += ndr->relative_base_offset;
1341         if (rel_offset > ndr->data_size) {
1342                 return ndr_pull_error(ndr, NDR_ERR_BUFSIZE,
1343                                       "ndr_pull_relative_ptr1 rel_offset(%u) > ndr->data_size(%u)",
1344                                       rel_offset, ndr->data_size);
1345         }
1346         return ndr_token_store(ndr, &ndr->relative_list, p, rel_offset);
1347 }
1348
1349 /*
1350   pull a relative object - stage2
1351   called during BUFFERS processing
1352 */
1353 _PUBLIC_ enum ndr_err_code ndr_pull_relative_ptr2(struct ndr_pull *ndr, const void *p)
1354 {
1355         uint32_t rel_offset;
1356         NDR_CHECK(ndr_token_retrieve(&ndr->relative_list, p, &rel_offset));
1357         return ndr_pull_set_offset(ndr, rel_offset);
1358 }
1359
1360 const static struct {
1361         enum ndr_err_code err;
1362         const char *string;
1363 } ndr_err_code_strings[] = {
1364         { NDR_ERR_SUCCESS, "Success" },
1365         { NDR_ERR_ARRAY_SIZE, "Bad Array Size" },
1366         { NDR_ERR_BAD_SWITCH, "Bad Switch" },
1367         { NDR_ERR_OFFSET, "Offset Error" },
1368         { NDR_ERR_RELATIVE, "Relative Pointer Error" },
1369         { NDR_ERR_CHARCNV, "Character Conversion Error" },
1370         { NDR_ERR_LENGTH, "Length Error" },
1371         { NDR_ERR_SUBCONTEXT, "Subcontext Error" },
1372         { NDR_ERR_COMPRESSION, "Compression Error" },
1373         { NDR_ERR_STRING, "String Error" },
1374         { NDR_ERR_VALIDATE, "Validate Error" },
1375         { NDR_ERR_BUFSIZE, "Buffer Size Error" },
1376         { NDR_ERR_ALLOC, "Allocation Error" },
1377         { NDR_ERR_RANGE, "Range Error" },
1378         { NDR_ERR_TOKEN, "Token Error" },
1379         { NDR_ERR_IPV4ADDRESS, "IPv4 Address Error" },
1380         { NDR_ERR_INVALID_POINTER, "Invalid Pointer" },
1381         { NDR_ERR_UNREAD_BYTES, "Unread Bytes" },
1382         { NDR_ERR_NDR64, "NDR64 assertion error" },
1383         { 0, NULL }
1384 };
1385
1386 _PUBLIC_ const char *ndr_map_error2string(enum ndr_err_code ndr_err)
1387 {
1388         int i;
1389         for (i = 0; ndr_err_code_strings[i].string != NULL; i++) {
1390                 if (ndr_err_code_strings[i].err == ndr_err)
1391                         return ndr_err_code_strings[i].string;
1392         }
1393         return "Unknown error";
1394 }