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 /*
  50   work out the number of bytes needed to align on a n byte boundary
  51 */
  52 _PUBLIC_ size_t ndr_align_size(uint32_t offset, size_t n)
  53 {
  54         if ((offset & (n-1)) == 0) return 0;
  55         return n - (offset & (n-1));
  56 }
  57
  58 /*
  59   initialise a ndr parse structure from a data blob
  60 */
  61 _PUBLIC_ struct ndr_pull *ndr_pull_init_blob(const DATA_BLOB *blob, TALLOC_CTX *mem_ctx, struct smb_iconv_convenience *iconv_convenience)
  62 {
  63         struct ndr_pull *ndr;
  64
  65         ndr = talloc_zero(mem_ctx, struct ndr_pull);
  66         if (!ndr) return NULL;
  67         ndr->current_mem_ctx = mem_ctx;
  68
  69         ndr->data = blob->data;
  70         ndr->data_size = blob->length;
  71         ndr->iconv_convenience = talloc_reference(ndr, iconv_convenience);
  72
  73         return ndr;
  74 }
  75
  76 /*
  77   advance by 'size' bytes
  78 */
  79 _PUBLIC_ enum ndr_err_code ndr_pull_advance(struct ndr_pull *ndr, uint32_t size)
  80 {
  81         ndr->offset += size;
  82         if (ndr->offset > ndr->data_size) {
  83                 return ndr_pull_error(ndr, NDR_ERR_BUFSIZE,
  84                                       "ndr_pull_advance by %u failed",
  85                                       size);
  86         }
  87         return NDR_ERR_SUCCESS;
  88 }
  89
  90 /*
  91   set the parse offset to 'ofs'
  92 */
  93 static enum ndr_err_code ndr_pull_set_offset(struct ndr_pull *ndr, uint32_t ofs)
  94 {
  95         ndr->offset = ofs;
  96         if (ndr->offset > ndr->data_size) {
  97                 return ndr_pull_error(ndr, NDR_ERR_BUFSIZE,
  98                                       "ndr_pull_set_offset %u failed",
  99                                       ofs);
 100         }
 101         return NDR_ERR_SUCCESS;
 102 }
 103
 104 /* create a ndr_push structure, ready for some marshalling */
 105 _PUBLIC_ struct ndr_push *ndr_push_init_ctx(TALLOC_CTX *mem_ctx, struct smb_iconv_convenience *iconv_convenience)
 106 {
 107         struct ndr_push *ndr;
 108
 109         ndr = talloc_zero(mem_ctx, struct ndr_push);
 110         if (!ndr) {
 111                 return NULL;
 112         }
 113
 114         ndr->flags = 0;
 115         ndr->alloc_size = NDR_BASE_MARSHALL_SIZE;
 116         ndr->data = talloc_array(ndr, uint8_t, ndr->alloc_size);
 117         if (!ndr->data) {
 118                 return NULL;
 119         }
 120         ndr->iconv_convenience = talloc_reference(ndr, iconv_convenience);
 121
 122         return ndr;
 123 }
 124
 125 /* return a DATA_BLOB structure for the current ndr_push marshalled data */
 126 _PUBLIC_ DATA_BLOB ndr_push_blob(struct ndr_push *ndr)
 127 {
 128         DATA_BLOB blob;
 129         blob = data_blob_const(ndr->data, ndr->offset);
 130         if (ndr->alloc_size > ndr->offset) {
 131                 ndr->data[ndr->offset] = 0;
 132         }
 133         return blob;
 134 }
 135
 136
 137 /*
 138   expand the available space in the buffer to ndr->offset + extra_size
 139 */
 140 _PUBLIC_ enum ndr_err_code ndr_push_expand(struct ndr_push *ndr, uint32_t extra_size)
 141 {
 142         uint32_t size = extra_size + ndr->offset;
 143
 144         if (size < ndr->offset) {
 145                 /* extra_size overflowed the offset */
 146                 return ndr_push_error(ndr, NDR_ERR_BUFSIZE, "Overflow in push_expand to %u",
 147                                       size);
 148         }
 149
 150         if (ndr->alloc_size > size) {
 151                 return NDR_ERR_SUCCESS;
 152         }
 153
 154         ndr->alloc_size += NDR_BASE_MARSHALL_SIZE;
 155         if (size+1 > ndr->alloc_size) {
 156                 ndr->alloc_size = size+1;
 157         }
 158         ndr->data = talloc_realloc(ndr, ndr->data, uint8_t, ndr->alloc_size);
 159         if (!ndr->data) {
 160                 return ndr_push_error(ndr, NDR_ERR_ALLOC, "Failed to push_expand to %u",
 161                                       ndr->alloc_size);
 162         }
 163
 164         return NDR_ERR_SUCCESS;
 165 }
 166
 167 _PUBLIC_ void ndr_print_debug_helper(struct ndr_print *ndr, const char *format, ...)
 168 {
 169         va_list ap;
 170         char *s = NULL;
 171         int i, ret;
 172
 173         va_start(ap, format);
 174         ret = vasprintf(&s, format, ap);
 175         va_end(ap);
 176
 177         if (ret == -1) {
 178                 return;
 179         }
 180
 181         for (i=0;i<ndr->depth;i++) {
 182                 DEBUGADD(1,("    "));
 183         }
 184
 185         DEBUGADD(1,("%s\n", s));
 186         free(s);
 187 }
 188
 189 _PUBLIC_ void ndr_print_string_helper(struct ndr_print *ndr, const char *format, ...)
 190 {
 191         va_list ap;
 192         int i;
 193
 194         for (i=0;i<ndr->depth;i++) {
 195                 ndr->private_data = talloc_asprintf_append_buffer(
 196                                         (char *)ndr->private_data, "    ");
 197         }
 198
 199         va_start(ap, format);
 200         ndr->private_data = talloc_vasprintf_append_buffer((char *)ndr->private_data,
 201                                                     format, ap);
 202         va_end(ap);
 203         ndr->private_data = talloc_asprintf_append_buffer((char *)ndr->private_data,
 204                                                    "\n");
 205 }
 206
 207 /*
 208   a useful helper function for printing idl structures via DEBUG()
 209 */
 210 _PUBLIC_ void ndr_print_debug(ndr_print_fn_t fn, const char *name, void *ptr)
 211 {
 212         struct ndr_print *ndr;
 213
 214         DEBUG(1,(" "));
 215
 216         ndr = talloc_zero(NULL, struct ndr_print);
 217         if (!ndr) return;
 218         ndr->print = ndr_print_debug_helper;
 219         ndr->depth = 1;
 220         ndr->flags = 0;
 221         fn(ndr, name, ptr);
 222         talloc_free(ndr);
 223 }
 224
 225 /*
 226   a useful helper function for printing idl unions via DEBUG()
 227 */
 228 _PUBLIC_ void ndr_print_union_debug(ndr_print_fn_t fn, const char *name, uint32_t level, void *ptr)
 229 {
 230         struct ndr_print *ndr;
 231
 232         DEBUG(1,(" "));
 233
 234         ndr = talloc_zero(NULL, struct ndr_print);
 235         if (!ndr) return;
 236         ndr->print = ndr_print_debug_helper;
 237         ndr->depth = 1;
 238         ndr->flags = 0;
 239         ndr_print_set_switch_value(ndr, ptr, level);
 240         fn(ndr, name, ptr);
 241         talloc_free(ndr);
 242 }
 243
 244 /*
 245   a useful helper function for printing idl function calls via DEBUG()
 246 */
 247 _PUBLIC_ void ndr_print_function_debug(ndr_print_function_t fn, const char *name, int flags, void *ptr)
 248 {
 249         struct ndr_print *ndr;
 250
 251         DEBUG(1,(" "));
 252
 253         ndr = talloc_zero(NULL, struct ndr_print);
 254         if (!ndr) return;
 255         ndr->print = ndr_print_debug_helper;
 256         ndr->depth = 1;
 257         ndr->flags = 0;
 258
 259         /* this is a s4 hack until we build up the courage to pass
 260          * this all the way down
 261          */
 262 #if _SAMBA_BUILD_ == 4
 263         ndr->iconv_convenience = smb_iconv_convenience_init(talloc_autofree_context(), "ASCII", "UTF-8", true);
 264 #endif
 265
 266         fn(ndr, name, flags, ptr);
 267         talloc_free(ndr);
 268 }
 269
 270 /*
 271   a useful helper function for printing idl structures to a string
 272 */
 273 _PUBLIC_ char *ndr_print_struct_string(TALLOC_CTX *mem_ctx, ndr_print_fn_t fn, const char *name, void *ptr)
 274 {
 275         struct ndr_print *ndr;
 276         char *ret = NULL;
 277
 278         ndr = talloc_zero(mem_ctx, struct ndr_print);
 279         if (!ndr) return NULL;
 280         ndr->private_data = talloc_strdup(ndr, "");
 281         if (!ndr->private_data) {
 282                 goto failed;
 283         }
 284         ndr->print = ndr_print_string_helper;
 285         ndr->depth = 1;
 286         ndr->flags = 0;
 287
 288         /* this is a s4 hack until we build up the courage to pass
 289          * this all the way down
 290          */
 291 #if _SAMBA_BUILD_ == 4
 292         ndr->iconv_convenience = smb_iconv_convenience_init(talloc_autofree_context(), "ASCII", "UTF-8", true);
 293 #endif
 294
 295         fn(ndr, name, ptr);
 296         ret = talloc_steal(mem_ctx, (char *)ndr->private_data);
 297 failed:
 298         talloc_free(ndr);
 299         return ret;
 300 }
 301
 302 /*
 303   a useful helper function for printing idl unions to a string
 304 */
 305 _PUBLIC_ char *ndr_print_union_string(TALLOC_CTX *mem_ctx, ndr_print_fn_t fn, const char *name, uint32_t level, void *ptr)
 306 {
 307         struct ndr_print *ndr;
 308         char *ret = NULL;
 309
 310         ndr = talloc_zero(mem_ctx, struct ndr_print);
 311         if (!ndr) return NULL;
 312         ndr->private_data = talloc_strdup(ndr, "");
 313         if (!ndr->private_data) {
 314                 goto failed;
 315         }
 316         ndr->print = ndr_print_string_helper;
 317         ndr->depth = 1;
 318         ndr->flags = 0;
 319         ndr_print_set_switch_value(ndr, ptr, level);
 320         fn(ndr, name, ptr);
 321         ret = talloc_steal(mem_ctx, (char *)ndr->private_data);
 322 failed:
 323         talloc_free(ndr);
 324         return ret;
 325 }
 326
 327 /*
 328   a useful helper function for printing idl function calls to a string
 329 */
 330 _PUBLIC_ char *ndr_print_function_string(TALLOC_CTX *mem_ctx,
 331                                 ndr_print_function_t fn, const char *name,
 332                                 int flags, void *ptr)
 333 {
 334         struct ndr_print *ndr;
 335         char *ret = NULL;
 336
 337         ndr = talloc_zero(mem_ctx, struct ndr_print);
 338         if (!ndr) return NULL;
 339         ndr->private_data = talloc_strdup(ndr, "");
 340         if (!ndr->private_data) {
 341                 goto failed;
 342         }
 343         ndr->print = ndr_print_string_helper;
 344         ndr->depth = 1;
 345         ndr->flags = 0;
 346         fn(ndr, name, flags, ptr);
 347         ret = talloc_steal(mem_ctx, (char *)ndr->private_data);
 348 failed:
 349         talloc_free(ndr);
 350         return ret;
 351 }
 352
 353 _PUBLIC_ void ndr_set_flags(uint32_t *pflags, uint32_t new_flags)
 354 {
 355         /* the big/little endian flags are inter-dependent */
 356         if (new_flags & LIBNDR_FLAG_LITTLE_ENDIAN) {
 357                 (*pflags) &= ~LIBNDR_FLAG_BIGENDIAN;
 358                 (*pflags) &= ~LIBNDR_FLAG_NDR64;
 359         }
 360         if (new_flags & LIBNDR_FLAG_BIGENDIAN) {
 361                 (*pflags) &= ~LIBNDR_FLAG_LITTLE_ENDIAN;
 362                 (*pflags) &= ~LIBNDR_FLAG_NDR64;
 363         }
 364         if (new_flags & LIBNDR_FLAG_REMAINING) {
 365                 (*pflags) &= ~LIBNDR_ALIGN_FLAGS;
 366         }
 367         if (new_flags & LIBNDR_ALIGN_FLAGS) {
 368                 (*pflags) &= ~LIBNDR_FLAG_REMAINING;
 369         }
 370         if (new_flags & LIBNDR_FLAG_NO_RELATIVE_REVERSE) {
 371                 (*pflags) &= ~LIBNDR_FLAG_RELATIVE_REVERSE;
 372         }
 373         (*pflags) |= new_flags;
 374 }
 375
 376 /*
 377   return and possibly log an NDR error
 378 */
 379 _PUBLIC_ enum ndr_err_code ndr_pull_error(struct ndr_pull *ndr,
 380                                  enum ndr_err_code ndr_err,
 381                                  const char *format, ...)
 382 {
 383         char *s=NULL;
 384         va_list ap;
 385         int ret;
 386
 387         va_start(ap, format);
 388         ret = vasprintf(&s, format, ap);
 389         va_end(ap);
 390
 391         if (ret == -1) {
 392                 return NDR_ERR_ALLOC;
 393         }
 394
 395         DEBUG(1,("ndr_pull_error(%u): %s\n", ndr_err, s));
 396
 397         free(s);
 398
 399         return ndr_err;
 400 }
 401
 402 /*
 403   return and possibly log an NDR error
 404 */
 405 _PUBLIC_ enum ndr_err_code ndr_push_error(struct ndr_push *ndr,
 406                                  enum ndr_err_code ndr_err,
 407                                  const char *format, ...)
 408 {
 409         char *s=NULL;
 410         va_list ap;
 411         int ret;
 412
 413         va_start(ap, format);
 414         ret = vasprintf(&s, format, ap);
 415         va_end(ap);
 416
 417         if (ret == -1) {
 418                 return NDR_ERR_ALLOC;
 419         }
 420
 421         DEBUG(1,("ndr_push_error(%u): %s\n", ndr_err, s));
 422
 423         free(s);
 424
 425         return ndr_err;
 426 }
 427
 428 /*
 429   handle subcontext buffers, which in midl land are user-marshalled, but
 430   we use magic in pidl to make them easier to cope with
 431 */
 432 _PUBLIC_ enum ndr_err_code ndr_pull_subcontext_start(struct ndr_pull *ndr,
 433                                    struct ndr_pull **_subndr,
 434                                    size_t header_size,
 435                                    ssize_t size_is)
 436 {
 437         struct ndr_pull *subndr;
 438         uint32_t r_content_size;
 439         bool force_le = false;
 440         bool force_be = false;
 441
 442         switch (header_size) {
 443         case 0: {
 444                 uint32_t content_size = ndr->data_size - ndr->offset;
 445                 if (size_is >= 0) {
 446                         content_size = size_is;
 447                 }
 448                 r_content_size = content_size;
 449                 break;
 450         }
 451
 452         case 2: {
 453                 uint16_t content_size;
 454                 NDR_CHECK(ndr_pull_uint16(ndr, NDR_SCALARS, &content_size));
 455                 if (size_is >= 0 && size_is != content_size) {
 456                         return ndr_pull_error(ndr, NDR_ERR_SUBCONTEXT, "Bad subcontext (PULL) size_is(%d) mismatch content_size %d",
 457                                                 (int)size_is, (int)content_size);
 458                 }
 459                 r_content_size = content_size;
 460                 break;
 461         }
 462
 463         case 4: {
 464                 uint32_t content_size;
 465                 NDR_CHECK(ndr_pull_uint3264(ndr, NDR_SCALARS, &content_size));
 466                 if (size_is >= 0 && size_is != content_size) {
 467                         return ndr_pull_error(ndr, NDR_ERR_SUBCONTEXT, "Bad subcontext (PULL) size_is(%d) mismatch content_size %d",
 468                                                 (int)size_is, (int)content_size);
 469                 }
 470                 r_content_size = content_size;
 471                 break;
 472         }
 473         case 0xFFFFFC01: {
 474                 /*
 475                  * Common Type Header for the Serialization Stream
 476                  * See [MS-RPCE] 2.2.6 Type Serialization Version 1
 477                  */
 478                 uint8_t version;
 479                 uint8_t drep;
 480                 uint16_t hdrlen;
 481                 uint32_t filler;
 482                 uint32_t content_size;
 483                 uint32_t reserved;
 484
 485                 /* version */
 486                 NDR_CHECK(ndr_pull_uint8(ndr, NDR_SCALARS, &version));
 487
 488                 if (version != 1) {
 489                         return ndr_pull_error(ndr, NDR_ERR_SUBCONTEXT,
 490                                               "Bad subcontext (PULL) Common Type Header version %d != 1",
 491                                               (int)version);
 492                 }
 493
 494                 /*
 495                  * 0x10 little endian
 496                  * 0x00 big endian
 497                  */
 498                 NDR_CHECK(ndr_pull_uint8(ndr, NDR_SCALARS, &drep));
 499                 if (drep == 0x10) {
 500                         force_le = true;
 501                 } else if (drep == 0x00) {
 502                         force_be = true;
 503                 } else {
 504                         return ndr_pull_error(ndr, NDR_ERR_SUBCONTEXT,
 505                                               "Bad subcontext (PULL) Common Type Header invalid drep 0x%02X",
 506                                               (unsigned int)drep);
 507                 }
 508
 509                 /* length of the "Private Header for Constructed Type" */
 510                 NDR_CHECK(ndr_pull_uint16(ndr, NDR_SCALARS, &hdrlen));
 511                 if (hdrlen != 8) {
 512                         return ndr_pull_error(ndr, NDR_ERR_SUBCONTEXT,
 513                                               "Bad subcontext (PULL) Common Type Header length %d != 8",
 514                                               (int)hdrlen);
 515                 }
 516
 517                 /* filler should be ignored */
 518                 NDR_CHECK(ndr_pull_uint32(ndr, NDR_SCALARS, &filler));
 519
 520                 /*
 521                  * Private Header for Constructed Type
 522                  */
 523                 /* length - will be updated latter */
 524                 NDR_CHECK(ndr_pull_uint32(ndr, NDR_SCALARS, &content_size));
 525                 if (size_is >= 0 && size_is != content_size) {
 526                         return ndr_pull_error(ndr, NDR_ERR_SUBCONTEXT, "Bad subcontext (PULL) size_is(%d) mismatch content_size %d",
 527                                               (int)size_is, (int)content_size);
 528                 }
 529                 /* the content size must be a multiple of 8 */
 530                 if ((content_size % 8) != 0) {
 531                         return ndr_pull_error(ndr, NDR_ERR_SUBCONTEXT,
 532                                               "Bad subcontext (PULL) size_is(%d) not padded to 8 content_size %d",
 533                                               (int)size_is, (int)content_size);
 534                 }
 535                 r_content_size = content_size;
 536
 537                 /* reserved */
 538                 NDR_CHECK(ndr_pull_uint32(ndr, NDR_SCALARS, &reserved));
 539                 break;
 540         }
 541         default:
 542                 return ndr_pull_error(ndr, NDR_ERR_SUBCONTEXT, "Bad subcontext (PULL) header_size %d",
 543                                       (int)header_size);
 544         }
 545
 546         NDR_PULL_NEED_BYTES(ndr, r_content_size);
 547
 548         subndr = talloc_zero(ndr, struct ndr_pull);
 549         NDR_ERR_HAVE_NO_MEMORY(subndr);
 550         subndr->flags           = ndr->flags & ~LIBNDR_FLAG_NDR64;
 551         subndr->current_mem_ctx = ndr->current_mem_ctx;
 552
 553         subndr->data = ndr->data + ndr->offset;
 554         subndr->offset = 0;
 555         subndr->data_size = r_content_size;
 556         subndr->iconv_convenience = talloc_reference(subndr, ndr->iconv_convenience);
 557
 558         if (force_le) {
 559                 ndr_set_flags(&ndr->flags, LIBNDR_FLAG_LITTLE_ENDIAN);
 560         } else if (force_be) {
 561                 ndr_set_flags(&ndr->flags, LIBNDR_FLAG_BIGENDIAN);
 562         }
 563
 564         *_subndr = subndr;
 565         return NDR_ERR_SUCCESS;
 566 }
 567
 568 _PUBLIC_ enum ndr_err_code ndr_pull_subcontext_end(struct ndr_pull *ndr,
 569                                  struct ndr_pull *subndr,
 570                                  size_t header_size,
 571                                  ssize_t size_is)
 572 {
 573         uint32_t advance;
 574         if (size_is >= 0) {
 575                 advance = size_is;
 576         } else if (header_size > 0) {
 577                 advance = subndr->data_size;
 578         } else {
 579                 advance = subndr->offset;
 580         }
 581         NDR_CHECK(ndr_pull_advance(ndr, advance));
 582         return NDR_ERR_SUCCESS;
 583 }
 584
 585 _PUBLIC_ enum ndr_err_code ndr_push_subcontext_start(struct ndr_push *ndr,
 586                                    struct ndr_push **_subndr,
 587                                    size_t header_size,
 588                                    ssize_t size_is)
 589 {
 590         struct ndr_push *subndr;
 591
 592         subndr = ndr_push_init_ctx(ndr, ndr->iconv_convenience);
 593         NDR_ERR_HAVE_NO_MEMORY(subndr);
 594         subndr->flags   = ndr->flags & ~LIBNDR_FLAG_NDR64;
 595
 596         if (size_is > 0) {
 597                 NDR_CHECK(ndr_push_zero(subndr, size_is));
 598                 subndr->offset = 0;
 599                 subndr->relative_end_offset = size_is;
 600         }
 601
 602         *_subndr = subndr;
 603         return NDR_ERR_SUCCESS;
 604 }
 605
 606 /*
 607   push a subcontext header
 608 */
 609 _PUBLIC_ enum ndr_err_code ndr_push_subcontext_end(struct ndr_push *ndr,
 610                                  struct ndr_push *subndr,
 611                                  size_t header_size,
 612                                  ssize_t size_is)
 613 {
 614         ssize_t padding_len;
 615
 616         if (size_is >= 0) {
 617                 padding_len = size_is - subndr->offset;
 618                 if (padding_len < 0) {
 619                         return ndr_push_error(ndr, NDR_ERR_SUBCONTEXT, "Bad subcontext (PUSH) content_size %d is larger than size_is(%d)",
 620                                               (int)subndr->offset, (int)size_is);
 621                 }
 622                 subndr->offset = size_is;
 623         }
 624
 625         switch (header_size) {
 626         case 0:
 627                 break;
 628
 629         case 2:
 630                 NDR_CHECK(ndr_push_uint16(ndr, NDR_SCALARS, subndr->offset));
 631                 break;
 632
 633         case 4:
 634                 NDR_CHECK(ndr_push_uint3264(ndr, NDR_SCALARS, subndr->offset));
 635                 break;
 636
 637         case 0xFFFFFC01:
 638                 /*
 639                  * Common Type Header for the Serialization Stream
 640                  * See [MS-RPCE] 2.2.6 Type Serialization Version 1
 641                  */
 642                 padding_len = NDR_ROUND(subndr->offset, 8) - subndr->offset;
 643                 if (padding_len > 0) {
 644                         NDR_CHECK(ndr_push_zero(subndr, padding_len));
 645                 }
 646
 647                 /* version */
 648                 NDR_CHECK(ndr_push_uint8(ndr, NDR_SCALARS, 1));
 649
 650                 /*
 651                  * 0x10 little endian
 652                  * 0x00 big endian
 653                  */
 654                 NDR_CHECK(ndr_push_uint8(ndr, NDR_SCALARS, NDR_BE(ndr)?0x00:0x10));
 655
 656                 /* length of the "Private Header for Constructed Type" */
 657                 NDR_CHECK(ndr_push_uint16(ndr, NDR_SCALARS, 8));
 658
 659                 /* filler */
 660                 NDR_CHECK(ndr_push_uint32(ndr, NDR_SCALARS, 0xCCCCCCCC));
 661
 662                 /*
 663                  * Private Header for Constructed Type
 664                  */
 665                 /* length - will be updated latter */
 666                 NDR_CHECK(ndr_push_uint32(ndr, NDR_SCALARS, subndr->offset));
 667
 668                 /* reserved */
 669                 NDR_CHECK(ndr_push_uint32(ndr, NDR_SCALARS, 0));
 670                 break;
 671
 672         default:
 673                 return ndr_push_error(ndr, NDR_ERR_SUBCONTEXT, "Bad subcontext header size %d",
 674                                       (int)header_size);
 675         }
 676
 677         NDR_CHECK(ndr_push_bytes(ndr, subndr->data, subndr->offset));
 678         return NDR_ERR_SUCCESS;
 679 }
 680
 681 /*
 682   store a token in the ndr context, for later retrieval
 683 */
 684 _PUBLIC_ enum ndr_err_code ndr_token_store(TALLOC_CTX *mem_ctx,
 685                          struct ndr_token_list **list,
 686                          const void *key,
 687                          uint32_t value)
 688 {
 689         struct ndr_token_list *tok;
 690         tok = talloc(mem_ctx, struct ndr_token_list);
 691         NDR_ERR_HAVE_NO_MEMORY(tok);
 692         tok->key = key;
 693         tok->value = value;
 694         DLIST_ADD((*list), tok);
 695         return NDR_ERR_SUCCESS;
 696 }
 697
 698 /*
 699   retrieve a token from a ndr context, using cmp_fn to match the tokens
 700 */
 701 _PUBLIC_ enum ndr_err_code ndr_token_retrieve_cmp_fn(struct ndr_token_list **list, const void *key, uint32_t *v,
 702                                    comparison_fn_t _cmp_fn, bool _remove_tok)
 703 {
 704         struct ndr_token_list *tok;
 705         for (tok=*list;tok;tok=tok->next) {
 706                 if (_cmp_fn && _cmp_fn(tok->key,key)==0) goto found;
 707                 else if (!_cmp_fn && tok->key == key) goto found;
 708         }
 709         return NDR_ERR_TOKEN;
 710 found:
 711         *v = tok->value;
 712         if (_remove_tok) {
 713                 DLIST_REMOVE((*list), tok);
 714                 talloc_free(tok);
 715         }
 716         return NDR_ERR_SUCCESS;
 717 }
 718
 719 /*
 720   retrieve a token from a ndr context
 721 */
 722 _PUBLIC_ enum ndr_err_code ndr_token_retrieve(struct ndr_token_list **list, const void *key, uint32_t *v)
 723 {
 724         return ndr_token_retrieve_cmp_fn(list, key, v, NULL, true);
 725 }
 726
 727 /*
 728   peek at but don't removed a token from a ndr context
 729 */
 730 _PUBLIC_ uint32_t ndr_token_peek(struct ndr_token_list **list, const void *key)
 731 {
 732         enum ndr_err_code status;
 733         uint32_t v;
 734
 735         status = ndr_token_retrieve_cmp_fn(list, key, &v, NULL, false);
 736         if (!NDR_ERR_CODE_IS_SUCCESS(status)) {
 737                 return 0;
 738         }
 739
 740         return v;
 741 }
 742
 743 /*
 744   pull an array size field and add it to the array_size_list token list
 745 */
 746 _PUBLIC_ enum ndr_err_code ndr_pull_array_size(struct ndr_pull *ndr, const void *p)
 747 {
 748         uint32_t size;
 749         NDR_CHECK(ndr_pull_uint3264(ndr, NDR_SCALARS, &size));
 750         return ndr_token_store(ndr, &ndr->array_size_list, p, size);
 751 }
 752
 753 /*
 754   get the stored array size field
 755 */
 756 _PUBLIC_ uint32_t ndr_get_array_size(struct ndr_pull *ndr, const void *p)
 757 {
 758         return ndr_token_peek(&ndr->array_size_list, p);
 759 }
 760
 761 /*
 762   check the stored array size field
 763 */
 764 _PUBLIC_ enum ndr_err_code ndr_check_array_size(struct ndr_pull *ndr, void *p, uint32_t size)
 765 {
 766         uint32_t stored;
 767         stored = ndr_token_peek(&ndr->array_size_list, p);
 768         if (stored != size) {
 769                 return ndr_pull_error(ndr, NDR_ERR_ARRAY_SIZE,
 770                                       "Bad array size - got %u expected %u\n",
 771                                       stored, size);
 772         }
 773         return NDR_ERR_SUCCESS;
 774 }
 775
 776 /*
 777   pull an array length field and add it to the array_length_list token list
 778 */
 779 _PUBLIC_ enum ndr_err_code ndr_pull_array_length(struct ndr_pull *ndr, const void *p)
 780 {
 781         uint32_t length, offset;
 782         NDR_CHECK(ndr_pull_uint3264(ndr, NDR_SCALARS, &offset));
 783         if (offset != 0) {
 784                 return ndr_pull_error(ndr, NDR_ERR_ARRAY_SIZE,
 785                                       "non-zero array offset %u\n", offset);
 786         }
 787         NDR_CHECK(ndr_pull_uint3264(ndr, NDR_SCALARS, &length));
 788         return ndr_token_store(ndr, &ndr->array_length_list, p, length);
 789 }
 790
 791 /*
 792   get the stored array length field
 793 */
 794 _PUBLIC_ uint32_t ndr_get_array_length(struct ndr_pull *ndr, const void *p)
 795 {
 796         return ndr_token_peek(&ndr->array_length_list, p);
 797 }
 798
 799 /*
 800   check the stored array length field
 801 */
 802 _PUBLIC_ enum ndr_err_code ndr_check_array_length(struct ndr_pull *ndr, void *p, uint32_t length)
 803 {
 804         uint32_t stored;
 805         stored = ndr_token_peek(&ndr->array_length_list, p);
 806         if (stored != length) {
 807                 return ndr_pull_error(ndr, NDR_ERR_ARRAY_SIZE,
 808                                       "Bad array length - got %u expected %u\n",
 809                                       stored, length);
 810         }
 811         return NDR_ERR_SUCCESS;
 812 }
 813
 814 /*
 815   store a switch value
 816  */
 817 _PUBLIC_ enum ndr_err_code ndr_push_set_switch_value(struct ndr_push *ndr, const void *p, uint32_t val)
 818 {
 819         return ndr_token_store(ndr, &ndr->switch_list, p, val);
 820 }
 821
 822 _PUBLIC_ enum ndr_err_code ndr_pull_set_switch_value(struct ndr_pull *ndr, const void *p, uint32_t val)
 823 {
 824         return ndr_token_store(ndr, &ndr->switch_list, p, val);
 825 }
 826
 827 _PUBLIC_ enum ndr_err_code ndr_print_set_switch_value(struct ndr_print *ndr, const void *p, uint32_t val)
 828 {
 829         return ndr_token_store(ndr, &ndr->switch_list, p, val);
 830 }
 831
 832 /*
 833   retrieve a switch value
 834  */
 835 _PUBLIC_ uint32_t ndr_push_get_switch_value(struct ndr_push *ndr, const void *p)
 836 {
 837         return ndr_token_peek(&ndr->switch_list, p);
 838 }
 839
 840 _PUBLIC_ uint32_t ndr_pull_get_switch_value(struct ndr_pull *ndr, const void *p)
 841 {
 842         return ndr_token_peek(&ndr->switch_list, p);
 843 }
 844
 845 _PUBLIC_ uint32_t ndr_print_get_switch_value(struct ndr_print *ndr, const void *p)
 846 {
 847         return ndr_token_peek(&ndr->switch_list, p);
 848 }
 849
 850 /*
 851   pull a struct from a blob using NDR
 852 */
 853 _PUBLIC_ enum ndr_err_code ndr_pull_struct_blob(const DATA_BLOB *blob, TALLOC_CTX *mem_ctx, struct smb_iconv_convenience *iconv_convenience, void *p,
 854                               ndr_pull_flags_fn_t fn)
 855 {
 856         struct ndr_pull *ndr;
 857         ndr = ndr_pull_init_blob(blob, mem_ctx, iconv_convenience);
 858         NDR_ERR_HAVE_NO_MEMORY(ndr);
 859         NDR_CHECK_FREE(fn(ndr, NDR_SCALARS|NDR_BUFFERS, p));
 860         talloc_free(ndr);
 861         return NDR_ERR_SUCCESS;
 862 }
 863
 864 /*
 865   pull a struct from a blob using NDR - failing if all bytes are not consumed
 866 */
 867 _PUBLIC_ enum ndr_err_code ndr_pull_struct_blob_all(const DATA_BLOB *blob, TALLOC_CTX *mem_ctx,
 868                                                     struct smb_iconv_convenience *iconv_convenience,
 869                                                     void *p, ndr_pull_flags_fn_t fn)
 870 {
 871         struct ndr_pull *ndr;
 872         uint32_t highest_ofs;
 873         ndr = ndr_pull_init_blob(blob, mem_ctx, iconv_convenience);
 874         NDR_ERR_HAVE_NO_MEMORY(ndr);
 875         NDR_CHECK_FREE(fn(ndr, NDR_SCALARS|NDR_BUFFERS, p));
 876         if (ndr->offset > ndr->relative_highest_offset) {
 877                 highest_ofs = ndr->offset;
 878         } else {
 879                 highest_ofs = ndr->relative_highest_offset;
 880         }
 881         if (highest_ofs < ndr->data_size) {
 882                 enum ndr_err_code ret;
 883                 ret = ndr_pull_error(ndr, NDR_ERR_UNREAD_BYTES,
 884                                      "not all bytes consumed ofs[%u] size[%u]",
 885                                      highest_ofs, ndr->data_size);
 886                 talloc_free(ndr);
 887                 return ret;
 888         }
 889         talloc_free(ndr);
 890         return NDR_ERR_SUCCESS;
 891 }
 892
 893 /*
 894   pull a union from a blob using NDR, given the union discriminator
 895 */
 896 _PUBLIC_ enum ndr_err_code ndr_pull_union_blob(const DATA_BLOB *blob, TALLOC_CTX *mem_ctx,
 897                                                struct smb_iconv_convenience *iconv_convenience, void *p,
 898                              uint32_t level, ndr_pull_flags_fn_t fn)
 899 {
 900         struct ndr_pull *ndr;
 901         ndr = ndr_pull_init_blob(blob, mem_ctx, iconv_convenience);
 902         NDR_ERR_HAVE_NO_MEMORY(ndr);
 903         NDR_CHECK_FREE(ndr_pull_set_switch_value(ndr, p, level));
 904         NDR_CHECK_FREE(fn(ndr, NDR_SCALARS|NDR_BUFFERS, p));
 905         talloc_free(ndr);
 906         return NDR_ERR_SUCCESS;
 907 }
 908
 909 /*
 910   pull a union from a blob using NDR, given the union discriminator,
 911   failing if all bytes are not consumed
 912 */
 913 _PUBLIC_ enum ndr_err_code ndr_pull_union_blob_all(const DATA_BLOB *blob, TALLOC_CTX *mem_ctx,
 914                                                    struct smb_iconv_convenience *iconv_convenience, void *p,
 915                              uint32_t level, ndr_pull_flags_fn_t fn)
 916 {
 917         struct ndr_pull *ndr;
 918         uint32_t highest_ofs;
 919         ndr = ndr_pull_init_blob(blob, mem_ctx, iconv_convenience);
 920         NDR_ERR_HAVE_NO_MEMORY(ndr);
 921         NDR_CHECK_FREE(ndr_pull_set_switch_value(ndr, p, level));
 922         NDR_CHECK_FREE(fn(ndr, NDR_SCALARS|NDR_BUFFERS, p));
 923         if (ndr->offset > ndr->relative_highest_offset) {
 924                 highest_ofs = ndr->offset;
 925         } else {
 926                 highest_ofs = ndr->relative_highest_offset;
 927         }
 928         if (highest_ofs < ndr->data_size) {
 929                 enum ndr_err_code ret;
 930                 ret = ndr_pull_error(ndr, NDR_ERR_UNREAD_BYTES,
 931                                      "not all bytes consumed ofs[%u] size[%u]",
 932                                      highest_ofs, ndr->data_size);
 933                 talloc_free(ndr);
 934                 return ret;
 935         }
 936         talloc_free(ndr);
 937         return NDR_ERR_SUCCESS;
 938 }
 939
 940 /*
 941   push a struct to a blob using NDR
 942 */
 943 _PUBLIC_ enum ndr_err_code ndr_push_struct_blob(DATA_BLOB *blob, TALLOC_CTX *mem_ctx, struct smb_iconv_convenience *iconv_convenience, const void *p, ndr_push_flags_fn_t fn)
 944 {
 945         struct ndr_push *ndr;
 946         ndr = ndr_push_init_ctx(mem_ctx, iconv_convenience);
 947         NDR_ERR_HAVE_NO_MEMORY(ndr);
 948
 949         NDR_CHECK(fn(ndr, NDR_SCALARS|NDR_BUFFERS, p));
 950
 951         *blob = ndr_push_blob(ndr);
 952         talloc_steal(mem_ctx, blob->data);
 953         talloc_free(ndr);
 954
 955         return NDR_ERR_SUCCESS;
 956 }
 957
 958 /*
 959   push a union to a blob using NDR
 960 */
 961 _PUBLIC_ enum ndr_err_code ndr_push_union_blob(DATA_BLOB *blob, TALLOC_CTX *mem_ctx, struct smb_iconv_convenience *iconv_convenience, void *p,
 962                              uint32_t level, ndr_push_flags_fn_t fn)
 963 {
 964         struct ndr_push *ndr;
 965         ndr = ndr_push_init_ctx(mem_ctx, iconv_convenience);
 966         NDR_ERR_HAVE_NO_MEMORY(ndr);
 967
 968         NDR_CHECK(ndr_push_set_switch_value(ndr, p, level));
 969         NDR_CHECK(fn(ndr, NDR_SCALARS|NDR_BUFFERS, p));
 970
 971         *blob = ndr_push_blob(ndr);
 972         talloc_steal(mem_ctx, blob->data);
 973         talloc_free(ndr);
 974
 975         return NDR_ERR_SUCCESS;
 976 }
 977
 978 /*
 979   generic ndr_size_*() handler for structures
 980 */
 981 _PUBLIC_ size_t ndr_size_struct(const void *p, int flags, ndr_push_flags_fn_t push, struct smb_iconv_convenience *iconv_convenience)
 982 {
 983         struct ndr_push *ndr;
 984         enum ndr_err_code status;
 985         size_t ret;
 986
 987         /* avoid recursion */
 988         if (flags & LIBNDR_FLAG_NO_NDR_SIZE) return 0;
 989
 990         ndr = ndr_push_init_ctx(NULL, iconv_convenience);
 991         if (!ndr) return 0;
 992         ndr->flags |= flags | LIBNDR_FLAG_NO_NDR_SIZE;
 993         status = push(ndr, NDR_SCALARS|NDR_BUFFERS, discard_const(p));
 994         if (!NDR_ERR_CODE_IS_SUCCESS(status)) {
 995                 talloc_free(ndr);
 996                 return 0;
 997         }
 998         ret = ndr->offset;
 999         talloc_free(ndr);
1000         return ret;
1001 }
1002
1003 /*
1004   generic ndr_size_*() handler for unions
1005 */
1006 _PUBLIC_ size_t ndr_size_union(const void *p, int flags, uint32_t level, ndr_push_flags_fn_t push, struct smb_iconv_convenience *iconv_convenience)
1007 {
1008         struct ndr_push *ndr;
1009         enum ndr_err_code status;
1010         size_t ret;
1011
1012         /* avoid recursion */
1013         if (flags & LIBNDR_FLAG_NO_NDR_SIZE) return 0;
1014
1015         ndr = ndr_push_init_ctx(NULL, iconv_convenience);
1016         if (!ndr) return 0;
1017         ndr->flags |= flags | LIBNDR_FLAG_NO_NDR_SIZE;
1018
1019         status = ndr_push_set_switch_value(ndr, p, level);
1020         if (!NDR_ERR_CODE_IS_SUCCESS(status)) {
1021                 talloc_free(ndr);
1022                 return 0;
1023         }
1024         status = push(ndr, NDR_SCALARS|NDR_BUFFERS, p);
1025         if (!NDR_ERR_CODE_IS_SUCCESS(status)) {
1026                 talloc_free(ndr);
1027                 return 0;
1028         }
1029         ret = ndr->offset;
1030         talloc_free(ndr);
1031         return ret;
1032 }
1033
1034 /*
1035   get the current base for relative pointers for the push
1036 */
1037 _PUBLIC_ uint32_t ndr_push_get_relative_base_offset(struct ndr_push *ndr)
1038 {
1039         return ndr->relative_base_offset;
1040 }
1041
1042 /*
1043   restore the old base for relative pointers for the push
1044 */
1045 _PUBLIC_ void ndr_push_restore_relative_base_offset(struct ndr_push *ndr, uint32_t offset)
1046 {
1047         ndr->relative_base_offset = offset;
1048 }
1049
1050 /*
1051   setup the current base for relative pointers for the push
1052   called in the NDR_SCALAR stage
1053 */
1054 _PUBLIC_ enum ndr_err_code ndr_push_setup_relative_base_offset1(struct ndr_push *ndr, const void *p, uint32_t offset)
1055 {
1056         ndr->relative_base_offset = offset;
1057         return ndr_token_store(ndr, &ndr->relative_base_list, p, offset);
1058 }
1059
1060 /*
1061   setup the current base for relative pointers for the push
1062   called in the NDR_BUFFERS stage
1063 */
1064 _PUBLIC_ enum ndr_err_code ndr_push_setup_relative_base_offset2(struct ndr_push *ndr, const void *p)
1065 {
1066         return ndr_token_retrieve(&ndr->relative_base_list, p, &ndr->relative_base_offset);
1067 }
1068
1069 /*
1070   push a relative object - stage1
1071   this is called during SCALARS processing
1072 */
1073 _PUBLIC_ enum ndr_err_code ndr_push_relative_ptr1(struct ndr_push *ndr, const void *p)
1074 {
1075         if (p == NULL) {
1076                 NDR_CHECK(ndr_push_uint32(ndr, NDR_SCALARS, 0));
1077                 return NDR_ERR_SUCCESS;
1078         }
1079         NDR_CHECK(ndr_push_align(ndr, 4));
1080         NDR_CHECK(ndr_token_store(ndr, &ndr->relative_list, p, ndr->offset));
1081         return ndr_push_uint32(ndr, NDR_SCALARS, 0xFFFFFFFF);
1082 }
1083
1084 /*
1085   push a short relative object - stage1
1086   this is called during SCALARS processing
1087 */
1088 _PUBLIC_ enum ndr_err_code ndr_push_short_relative_ptr1(struct ndr_push *ndr, const void *p)
1089 {
1090         if (p == NULL) {
1091                 NDR_CHECK(ndr_push_uint16(ndr, NDR_SCALARS, 0));
1092                 return NDR_ERR_SUCCESS;
1093         }
1094         NDR_CHECK(ndr_push_align(ndr, 2));
1095         NDR_CHECK(ndr_token_store(ndr, &ndr->relative_list, p, ndr->offset));
1096         return ndr_push_uint16(ndr, NDR_SCALARS, 0xFFFF);
1097 }
1098 /*
1099   push a relative object - stage2
1100   this is called during buffers processing
1101 */
1102 static enum ndr_err_code ndr_push_relative_ptr2(struct ndr_push *ndr, const void *p)
1103 {
1104         uint32_t save_offset;
1105         uint32_t ptr_offset = 0xFFFFFFFF;
1106         if (p == NULL) {
1107                 return NDR_ERR_SUCCESS;
1108         }
1109         save_offset = ndr->offset;
1110         NDR_CHECK(ndr_token_retrieve(&ndr->relative_list, p, &ptr_offset));
1111         if (ptr_offset > ndr->offset) {
1112                 return ndr_push_error(ndr, NDR_ERR_BUFSIZE,
1113                                       "ndr_push_relative_ptr2 ptr_offset(%u) > ndr->offset(%u)",
1114                                       ptr_offset, ndr->offset);
1115         }
1116         ndr->offset = ptr_offset;
1117         if (save_offset < ndr->relative_base_offset) {
1118                 return ndr_push_error(ndr, NDR_ERR_BUFSIZE,
1119                                       "ndr_push_relative_ptr2 save_offset(%u) < ndr->relative_base_offset(%u)",
1120                                       save_offset, ndr->relative_base_offset);
1121         }
1122         NDR_CHECK(ndr_push_uint32(ndr, NDR_SCALARS, save_offset - ndr->relative_base_offset));
1123         ndr->offset = save_offset;
1124         return NDR_ERR_SUCCESS;
1125 }
1126 /*
1127   push a short relative object - stage2
1128   this is called during buffers processing
1129 */
1130 _PUBLIC_ enum ndr_err_code ndr_push_short_relative_ptr2(struct ndr_push *ndr, const void *p)
1131 {
1132         uint32_t save_offset;
1133         uint32_t ptr_offset = 0xFFFF;
1134         if (p == NULL) {
1135                 return NDR_ERR_SUCCESS;
1136         }
1137         save_offset = ndr->offset;
1138         NDR_CHECK(ndr_token_retrieve(&ndr->relative_list, p, &ptr_offset));
1139         if (ptr_offset > ndr->offset) {
1140                 return ndr_push_error(ndr, NDR_ERR_BUFSIZE,
1141                                       "ndr_push_short_relative_ptr2 ptr_offset(%u) > ndr->offset(%u)",
1142                                       ptr_offset, ndr->offset);
1143         }
1144         ndr->offset = ptr_offset;
1145         if (save_offset < ndr->relative_base_offset) {
1146                 return ndr_push_error(ndr, NDR_ERR_BUFSIZE,
1147                                       "ndr_push_relative_ptr2 save_offset(%u) < ndr->relative_base_offset(%u)",
1148                                       save_offset, ndr->relative_base_offset);
1149         }
1150         NDR_CHECK(ndr_push_uint16(ndr, NDR_SCALARS, save_offset - ndr->relative_base_offset));
1151         ndr->offset = save_offset;
1152         return NDR_ERR_SUCCESS;
1153 }
1154
1155 /*
1156   push a relative object - stage2 start
1157   this is called during buffers processing
1158 */
1159 _PUBLIC_ enum ndr_err_code ndr_push_relative_ptr2_start(struct ndr_push *ndr, const void *p)
1160 {
1161         if (p == NULL) {
1162                 return NDR_ERR_SUCCESS;
1163         }
1164         if (!(ndr->flags & LIBNDR_FLAG_RELATIVE_REVERSE)) {
1165                 return ndr_push_relative_ptr2(ndr, p);
1166         }
1167         if (ndr->relative_end_offset == -1) {
1168                 return ndr_push_error(ndr, NDR_ERR_RELATIVE,
1169                               "ndr_push_relative_ptr2_start RELATIVE_REVERSE flag set and relative_end_offset %d",
1170                               ndr->relative_end_offset);
1171         }
1172         NDR_CHECK(ndr_token_store(ndr, &ndr->relative_begin_list, p, ndr->offset));
1173         return NDR_ERR_SUCCESS;
1174 }
1175
1176 /*
1177   push a relative object - stage2 end
1178   this is called during buffers processing
1179 */
1180 _PUBLIC_ enum ndr_err_code ndr_push_relative_ptr2_end(struct ndr_push *ndr, const void *p)
1181 {
1182         uint32_t begin_offset = 0xFFFFFFFF;
1183         ssize_t len;
1184         uint32_t correct_offset = 0;
1185         uint32_t align = 1;
1186         uint32_t pad = 0;
1187
1188         if (p == NULL) {
1189                 return NDR_ERR_SUCCESS;
1190         }
1191
1192         if (!(ndr->flags & LIBNDR_FLAG_RELATIVE_REVERSE)) {
1193                 return NDR_ERR_SUCCESS;
1194         }
1195
1196         if (ndr->flags & LIBNDR_FLAG_NO_NDR_SIZE) {
1197                 /* better say more than calculation a too small buffer */
1198                 NDR_PUSH_ALIGN(ndr, 8);
1199                 return NDR_ERR_SUCCESS;
1200         }
1201
1202         if (ndr->relative_end_offset < ndr->offset) {
1203                 return ndr_push_error(ndr, NDR_ERR_RELATIVE,
1204                                       "ndr_push_relative_ptr2_end:"
1205                                       "relative_end_offset %u < offset %u",
1206                                       ndr->relative_end_offset, ndr->offset);
1207         }
1208
1209         NDR_CHECK(ndr_token_retrieve(&ndr->relative_begin_list, p, &begin_offset));
1210
1211         /* we have marshalled a buffer, see how long it was */
1212         len = ndr->offset - begin_offset;
1213
1214         if (len < 0) {
1215                 return ndr_push_error(ndr, NDR_ERR_RELATIVE,
1216                                       "ndr_push_relative_ptr2_end:"
1217                                       "offset %u - begin_offset %u < 0",
1218                                       ndr->offset, begin_offset);
1219         }
1220
1221         if (ndr->relative_end_offset < len) {
1222                 return ndr_push_error(ndr, NDR_ERR_RELATIVE,
1223                                       "ndr_push_relative_ptr2_end:"
1224                                       "relative_end_offset %u < len %lld",
1225                                       ndr->offset, (long long)len);
1226         }
1227
1228         /* the reversed offset is at the end of the main buffer */
1229         correct_offset = ndr->relative_end_offset - len;
1230
1231         /* TODO: remove this hack and let the idl use FLAG_ALIGN2 explicit */
1232         align = 2;
1233
1234         if (ndr->flags & LIBNDR_FLAG_ALIGN2) {
1235                 align = 2;
1236         } else if (ndr->flags & LIBNDR_FLAG_ALIGN4) {
1237                 align = 4;
1238         } else if (ndr->flags & LIBNDR_FLAG_ALIGN8) {
1239                 align = 8;
1240         }
1241
1242         pad = ndr_align_size(correct_offset, align);
1243         if (pad) {
1244                 correct_offset += pad;
1245                 correct_offset -= align;
1246         }
1247
1248         if (correct_offset < begin_offset) {
1249                 return ndr_push_error(ndr, NDR_ERR_RELATIVE,
1250                                       "ndr_push_relative_ptr2_end: "
1251                                       "correct_offset %u < begin_offset %u",
1252                                       correct_offset, begin_offset);
1253         }
1254
1255         if (len > 0) {
1256                 uint32_t clear_size = correct_offset - begin_offset;
1257
1258                 clear_size = MIN(clear_size, len);
1259
1260                 /* now move the marshalled buffer to the end of the main buffer */
1261                 memmove(ndr->data + correct_offset, ndr->data + begin_offset, len);
1262
1263                 if (clear_size) {
1264                         /* and wipe out old buffer within the main buffer */
1265                         memset(ndr->data + begin_offset, '\0', clear_size);
1266                 }
1267         }
1268
1269         /* and set the end offset for the next buffer */
1270         ndr->relative_end_offset = correct_offset;
1271
1272         /* finally write the offset to the main buffer */
1273         ndr->offset = correct_offset;
1274         NDR_CHECK(ndr_push_relative_ptr2(ndr, p));
1275
1276         /* restore to where we were in the main buffer */
1277         ndr->offset = begin_offset;
1278
1279         return NDR_ERR_SUCCESS;
1280 }
1281
1282 /*
1283   get the current base for relative pointers for the pull
1284 */
1285 _PUBLIC_ uint32_t ndr_pull_get_relative_base_offset(struct ndr_pull *ndr)
1286 {
1287         return ndr->relative_base_offset;
1288 }
1289
1290 /*
1291   restore the old base for relative pointers for the pull
1292 */
1293 _PUBLIC_ void ndr_pull_restore_relative_base_offset(struct ndr_pull *ndr, uint32_t offset)
1294 {
1295         ndr->relative_base_offset = offset;
1296 }
1297
1298 /*
1299   setup the current base for relative pointers for the pull
1300   called in the NDR_SCALAR stage
1301 */
1302 _PUBLIC_ enum ndr_err_code ndr_pull_setup_relative_base_offset1(struct ndr_pull *ndr, const void *p, uint32_t offset)
1303 {
1304         ndr->relative_base_offset = offset;
1305         return ndr_token_store(ndr, &ndr->relative_base_list, p, offset);
1306 }
1307
1308 /*
1309   setup the current base for relative pointers for the pull
1310   called in the NDR_BUFFERS stage
1311 */
1312 _PUBLIC_ enum ndr_err_code ndr_pull_setup_relative_base_offset2(struct ndr_pull *ndr, const void *p)
1313 {
1314         return ndr_token_retrieve(&ndr->relative_base_list, p, &ndr->relative_base_offset);
1315 }
1316
1317 /*
1318   pull a relative object - stage1
1319   called during SCALARS processing
1320 */
1321 _PUBLIC_ enum ndr_err_code ndr_pull_relative_ptr1(struct ndr_pull *ndr, const void *p, uint32_t rel_offset)
1322 {
1323         rel_offset += ndr->relative_base_offset;
1324         if (rel_offset > ndr->data_size) {
1325                 return ndr_pull_error(ndr, NDR_ERR_BUFSIZE,
1326                                       "ndr_pull_relative_ptr1 rel_offset(%u) > ndr->data_size(%u)",
1327                                       rel_offset, ndr->data_size);
1328         }
1329         return ndr_token_store(ndr, &ndr->relative_list, p, rel_offset);
1330 }
1331
1332 /*
1333   pull a relative object - stage2
1334   called during BUFFERS processing
1335 */
1336 _PUBLIC_ enum ndr_err_code ndr_pull_relative_ptr2(struct ndr_pull *ndr, const void *p)
1337 {
1338         uint32_t rel_offset;
1339         NDR_CHECK(ndr_token_retrieve(&ndr->relative_list, p, &rel_offset));
1340         return ndr_pull_set_offset(ndr, rel_offset);
1341 }
1342
1343 const static struct {
1344         enum ndr_err_code err;
1345         const char *string;
1346 } ndr_err_code_strings[] = {
1347         { NDR_ERR_SUCCESS, "Success" },
1348         { NDR_ERR_ARRAY_SIZE, "Bad Array Size" },
1349         { NDR_ERR_BAD_SWITCH, "Bad Switch" },
1350         { NDR_ERR_OFFSET, "Offset Error" },
1351         { NDR_ERR_RELATIVE, "Relative Pointer Error" },
1352         { NDR_ERR_CHARCNV, "Character Conversion Error" },
1353         { NDR_ERR_LENGTH, "Length Error" },
1354         { NDR_ERR_SUBCONTEXT, "Subcontext Error" },
1355         { NDR_ERR_COMPRESSION, "Compression Error" },
1356         { NDR_ERR_STRING, "String Error" },
1357         { NDR_ERR_VALIDATE, "Validate Error" },
1358         { NDR_ERR_BUFSIZE, "Buffer Size Error" },
1359         { NDR_ERR_ALLOC, "Allocation Error" },
1360         { NDR_ERR_RANGE, "Range Error" },
1361         { NDR_ERR_TOKEN, "Token Error" },
1362         { NDR_ERR_IPV4ADDRESS, "IPv4 Address Error" },
1363         { NDR_ERR_INVALID_POINTER, "Invalid Pointer" },
1364         { NDR_ERR_UNREAD_BYTES, "Unread Bytes" },
1365         { NDR_ERR_NDR64, "NDR64 assertion error" },
1366         { 0, NULL }
1367 };
1368
1369 _PUBLIC_ const char *ndr_map_error2string(enum ndr_err_code ndr_err)
1370 {
1371         int i;
1372         for (i = 0; ndr_err_code_strings[i].string != NULL; i++) {
1373                 if (ndr_err_code_strings[i].err == ndr_err)
1374                         return ndr_err_code_strings[i].string;
1375         }
1376         return "Unknown error";
1377 }