source3/rpc_parse/parse_prs.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Samba memory buffer functions
   4    Copyright (C) Andrew Tridgell              1992-1997
   5    Copyright (C) Luke Kenneth Casson Leighton 1996-1997
   6    Copyright (C) Jeremy Allison               1999
   7    Copyright (C) Andrew Bartlett              2003.
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21 */
  22
  23 #include "includes.h"
  24
  25 #undef DBGC_CLASS
  26 #define DBGC_CLASS DBGC_RPC_PARSE
  27
  28 /**
  29  * Dump a prs to a file: from the current location through to the end.
  30  **/
  31 void prs_dump(const char *name, int v, prs_struct *ps)
  32 {
  33         prs_dump_region(name, v, ps, ps->data_offset, ps->buffer_size);
  34 }
  35
  36 /**
  37  * Dump from the start of the prs to the current location.
  38  **/
  39 void prs_dump_before(const char *name, int v, prs_struct *ps)
  40 {
  41         prs_dump_region(name, v, ps, 0, ps->data_offset);
  42 }
  43
  44 /**
  45  * Dump everything from the start of the prs up to the current location.
  46  **/
  47 void prs_dump_region(const char *name, int v, prs_struct *ps,
  48                      int from_off, int to_off)
  49 {
  50         int fd, i;
  51         char *fname = NULL;
  52         ssize_t sz;
  53         if (DEBUGLEVEL < 50) return;
  54         for (i=1;i<100;i++) {
  55                 if (v != -1) {
  56                         if (asprintf(&fname,"/tmp/%s_%d.%d.prs", name, v, i) < 0) {
  57                                 return;
  58                         }
  59                 } else {
  60                         if (asprintf(&fname,"/tmp/%s.%d.prs", name, i) < 0) {
  61                                 return;
  62                         }
  63                 }
  64                 fd = open(fname, O_WRONLY|O_CREAT|O_EXCL, 0644);
  65                 if (fd != -1 || errno != EEXIST) break;
  66         }
  67         if (fd != -1) {
  68                 sz = write(fd, ps->data_p + from_off, to_off - from_off);
  69                 i = close(fd);
  70                 if ( (sz != to_off-from_off) || (i != 0) ) {
  71                         DEBUG(0,("Error writing/closing %s: %ld!=%ld %d\n", fname, (unsigned long)sz, (unsigned long)to_off-from_off, i ));
  72                 } else {
  73                         DEBUG(0,("created %s\n", fname));
  74                 }
  75         }
  76         SAFE_FREE(fname);
  77 }
  78
  79 /*******************************************************************
  80  Debug output for parsing info
  81
  82  XXXX side-effect of this function is to increase the debug depth XXXX.
  83
  84 ********************************************************************/
  85
  86 void prs_debug(prs_struct *ps, int depth, const char *desc, const char *fn_name)
  87 {
  88         DEBUG(5+depth, ("%s%06x %s %s\n", tab_depth(5+depth,depth), ps->data_offset, fn_name, desc));
  89 }
  90
  91 /**
  92  * Initialise an expandable parse structure.
  93  *
  94  * @param size Initial buffer size.  If >0, a new buffer will be
  95  * created with malloc().
  96  *
  97  * @return False if allocation fails, otherwise True.
  98  **/
  99
 100 bool prs_init(prs_struct *ps, uint32 size, TALLOC_CTX *ctx, bool io)
 101 {
 102         ZERO_STRUCTP(ps);
 103         ps->io = io;
 104         ps->bigendian_data = RPC_LITTLE_ENDIAN;
 105         ps->align = RPC_PARSE_ALIGN;
 106         ps->is_dynamic = False;
 107         ps->data_offset = 0;
 108         ps->buffer_size = 0;
 109         ps->data_p = NULL;
 110         ps->mem_ctx = ctx;
 111
 112         if (size != 0) {
 113                 ps->buffer_size = size;
 114                 if((ps->data_p = (char *)SMB_MALLOC((size_t)size)) == NULL) {
 115                         DEBUG(0,("prs_init: malloc fail for %u bytes.\n", (unsigned int)size));
 116                         return False;
 117                 }
 118                 memset(ps->data_p, '\0', (size_t)size);
 119                 ps->is_dynamic = True; /* We own this memory. */
 120         } else if (MARSHALLING(ps)) {
 121                 /* If size is zero and we're marshalling we should allocate memory on demand. */
 122                 ps->is_dynamic = True;
 123         }
 124
 125         return True;
 126 }
 127
 128 /*******************************************************************
 129  Delete the memory in a parse structure - if we own it.
 130
 131  NOTE: Contrary to the somewhat confusing naming, this function is not
 132        intended for freeing memory allocated by prs_alloc_mem().  That memory
 133        is attached to the talloc context given by ps->mem_ctx.
 134  ********************************************************************/
 135
 136 void prs_mem_free(prs_struct *ps)
 137 {
 138         if(ps->is_dynamic)
 139                 SAFE_FREE(ps->data_p);
 140         ps->is_dynamic = False;
 141         ps->buffer_size = 0;
 142         ps->data_offset = 0;
 143 }
 144
 145 /*******************************************************************
 146  Clear the memory in a parse structure.
 147  ********************************************************************/
 148
 149 void prs_mem_clear(prs_struct *ps)
 150 {
 151         if (ps->buffer_size)
 152                 memset(ps->data_p, '\0', (size_t)ps->buffer_size);
 153 }
 154
 155 /*******************************************************************
 156  Allocate memory when unmarshalling... Always zero clears.
 157  ********************************************************************/
 158
 159 #if defined(PARANOID_MALLOC_CHECKER)
 160 char *prs_alloc_mem_(prs_struct *ps, size_t size, unsigned int count)
 161 #else
 162 char *prs_alloc_mem(prs_struct *ps, size_t size, unsigned int count)
 163 #endif
 164 {
 165         char *ret = NULL;
 166
 167         if (size && count) {
 168                 /* We can't call the type-safe version here. */
 169                 ret = (char *)_talloc_zero_array(ps->mem_ctx, size, count,
 170                                                  "parse_prs");
 171         }
 172         return ret;
 173 }
 174
 175 /*******************************************************************
 176  Return the current talloc context we're using.
 177  ********************************************************************/
 178
 179 TALLOC_CTX *prs_get_mem_context(prs_struct *ps)
 180 {
 181         return ps->mem_ctx;
 182 }
 183
 184 /*******************************************************************
 185  Hand some already allocated memory to a prs_struct.
 186  ********************************************************************/
 187
 188 void prs_give_memory(prs_struct *ps, char *buf, uint32 size, bool is_dynamic)
 189 {
 190         ps->is_dynamic = is_dynamic;
 191         ps->data_p = buf;
 192         ps->buffer_size = size;
 193 }
 194
 195 /*******************************************************************
 196  Take some memory back from a prs_struct.
 197  ********************************************************************/
 198
 199 char *prs_take_memory(prs_struct *ps, uint32 *psize)
 200 {
 201         char *ret = ps->data_p;
 202         if(psize)
 203                 *psize = ps->buffer_size;
 204         ps->is_dynamic = False;
 205         prs_mem_free(ps);
 206         return ret;
 207 }
 208
 209 /*******************************************************************
 210  Set a prs_struct to exactly a given size. Will grow or tuncate if neccessary.
 211  ********************************************************************/
 212
 213 bool prs_set_buffer_size(prs_struct *ps, uint32 newsize)
 214 {
 215         if (newsize > ps->buffer_size)
 216                 return prs_force_grow(ps, newsize - ps->buffer_size);
 217
 218         if (newsize < ps->buffer_size) {
 219                 ps->buffer_size = newsize;
 220
 221                 /* newsize == 0 acts as a free and set pointer to NULL */
 222                 if (newsize == 0) {
 223                         SAFE_FREE(ps->data_p);
 224                 } else {
 225                         ps->data_p = (char *)SMB_REALLOC(ps->data_p, newsize);
 226
 227                         if (ps->data_p == NULL) {
 228                                 DEBUG(0,("prs_set_buffer_size: Realloc failure for size %u.\n",
 229                                         (unsigned int)newsize));
 230                                 DEBUG(0,("prs_set_buffer_size: Reason %s\n",strerror(errno)));
 231                                 return False;
 232                         }
 233                 }
 234         }
 235
 236         return True;
 237 }
 238
 239 /*******************************************************************
 240  Attempt, if needed, to grow a data buffer.
 241  Also depends on the data stream mode (io).
 242  ********************************************************************/
 243
 244 bool prs_grow(prs_struct *ps, uint32 extra_space)
 245 {
 246         uint32 new_size;
 247
 248         ps->grow_size = MAX(ps->grow_size, ps->data_offset + extra_space);
 249
 250         if(ps->data_offset + extra_space <= ps->buffer_size)
 251                 return True;
 252
 253         /*
 254          * We cannot grow the buffer if we're not reading
 255          * into the prs_struct, or if we don't own the memory.
 256          */
 257
 258         if(UNMARSHALLING(ps) || !ps->is_dynamic) {
 259                 DEBUG(0,("prs_grow: Buffer overflow - unable to expand buffer by %u bytes.\n",
 260                                 (unsigned int)extra_space));
 261                 return False;
 262         }
 263
 264         /*
 265          * Decide how much extra space we really need.
 266          */
 267
 268         extra_space -= (ps->buffer_size - ps->data_offset);
 269         if(ps->buffer_size == 0) {
 270                 /*
 271                  * Ensure we have at least a PDU's length, or extra_space, whichever
 272                  * is greater.
 273                  */
 274
 275                 new_size = MAX(RPC_MAX_PDU_FRAG_LEN,extra_space);
 276
 277                 if((ps->data_p = (char *)SMB_MALLOC(new_size)) == NULL) {
 278                         DEBUG(0,("prs_grow: Malloc failure for size %u.\n", (unsigned int)new_size));
 279                         return False;
 280                 }
 281                 memset(ps->data_p, '\0', (size_t)new_size );
 282         } else {
 283                 /*
 284                  * If the current buffer size is bigger than the space needed, just
 285                  * double it, else add extra_space.
 286                  */
 287                 new_size = MAX(ps->buffer_size*2, ps->buffer_size + extra_space);
 288
 289                 if ((ps->data_p = (char *)SMB_REALLOC(ps->data_p, new_size)) == NULL) {
 290                         DEBUG(0,("prs_grow: Realloc failure for size %u.\n",
 291                                 (unsigned int)new_size));
 292                         return False;
 293                 }
 294
 295                 memset(&ps->data_p[ps->buffer_size], '\0', (size_t)(new_size - ps->buffer_size));
 296         }
 297         ps->buffer_size = new_size;
 298
 299         return True;
 300 }
 301
 302 /*******************************************************************
 303  Attempt to force a data buffer to grow by len bytes.
 304  This is only used when appending more data onto a prs_struct
 305  when reading an rpc reply, before unmarshalling it.
 306  ********************************************************************/
 307
 308 bool prs_force_grow(prs_struct *ps, uint32 extra_space)
 309 {
 310         uint32 new_size = ps->buffer_size + extra_space;
 311
 312         if(!UNMARSHALLING(ps) || !ps->is_dynamic) {
 313                 DEBUG(0,("prs_force_grow: Buffer overflow - unable to expand buffer by %u bytes.\n",
 314                                 (unsigned int)extra_space));
 315                 return False;
 316         }
 317
 318         if((ps->data_p = (char *)SMB_REALLOC(ps->data_p, new_size)) == NULL) {
 319                 DEBUG(0,("prs_force_grow: Realloc failure for size %u.\n",
 320                         (unsigned int)new_size));
 321                 return False;
 322         }
 323
 324         memset(&ps->data_p[ps->buffer_size], '\0', (size_t)(new_size - ps->buffer_size));
 325
 326         ps->buffer_size = new_size;
 327
 328         return True;
 329 }
 330
 331 /*******************************************************************
 332  Get the data pointer (external interface).
 333 ********************************************************************/
 334
 335 char *prs_data_p(prs_struct *ps)
 336 {
 337         return ps->data_p;
 338 }
 339
 340 /*******************************************************************
 341  Get the current data size (external interface).
 342  ********************************************************************/
 343
 344 uint32 prs_data_size(prs_struct *ps)
 345 {
 346         return ps->buffer_size;
 347 }
 348
 349 /*******************************************************************
 350  Fetch the current offset (external interface).
 351  ********************************************************************/
 352
 353 uint32 prs_offset(prs_struct *ps)
 354 {
 355         return ps->data_offset;
 356 }
 357
 358 /*******************************************************************
 359  Set the current offset (external interface).
 360  ********************************************************************/
 361
 362 bool prs_set_offset(prs_struct *ps, uint32 offset)
 363 {
 364         if(offset <= ps->data_offset) {
 365                 ps->data_offset = offset;
 366                 return True;
 367         }
 368
 369         if(!prs_grow(ps, offset - ps->data_offset))
 370                 return False;
 371
 372         ps->data_offset = offset;
 373         return True;
 374 }
 375
 376 /*******************************************************************
 377  Append the data from one parse_struct into another.
 378  ********************************************************************/
 379
 380 bool prs_append_prs_data(prs_struct *dst, prs_struct *src)
 381 {
 382         if (prs_offset(src) == 0)
 383                 return True;
 384
 385         if(!prs_grow(dst, prs_offset(src)))
 386                 return False;
 387
 388         memcpy(&dst->data_p[dst->data_offset], src->data_p, (size_t)prs_offset(src));
 389         dst->data_offset += prs_offset(src);
 390
 391         return True;
 392 }
 393
 394 /*******************************************************************
 395  Append some data from one parse_struct into another.
 396  ********************************************************************/
 397
 398 bool prs_append_some_prs_data(prs_struct *dst, prs_struct *src, int32 start, uint32 len)
 399 {
 400         if (len == 0)
 401                 return True;
 402
 403         if(!prs_grow(dst, len))
 404                 return False;
 405
 406         memcpy(&dst->data_p[dst->data_offset], src->data_p + start, (size_t)len);
 407         dst->data_offset += len;
 408
 409         return True;
 410 }
 411
 412 /*******************************************************************
 413  Append the data from a buffer into a parse_struct.
 414  ********************************************************************/
 415
 416 bool prs_copy_data_in(prs_struct *dst, const char *src, uint32 len)
 417 {
 418         if (len == 0)
 419                 return True;
 420
 421         if(!prs_grow(dst, len))
 422                 return False;
 423
 424         memcpy(&dst->data_p[dst->data_offset], src, (size_t)len);
 425         dst->data_offset += len;
 426
 427         return True;
 428 }
 429
 430 /*******************************************************************
 431  Copy some data from a parse_struct into a buffer.
 432  ********************************************************************/
 433
 434 bool prs_copy_data_out(char *dst, prs_struct *src, uint32 len)
 435 {
 436         if (len == 0)
 437                 return True;
 438
 439         if(!prs_mem_get(src, len))
 440                 return False;
 441
 442         memcpy(dst, &src->data_p[src->data_offset], (size_t)len);
 443         src->data_offset += len;
 444
 445         return True;
 446 }
 447
 448 /*******************************************************************
 449  Copy all the data from a parse_struct into a buffer.
 450  ********************************************************************/
 451
 452 bool prs_copy_all_data_out(char *dst, prs_struct *src)
 453 {
 454         uint32 len = prs_offset(src);
 455
 456         if (!len)
 457                 return True;
 458
 459         prs_set_offset(src, 0);
 460         return prs_copy_data_out(dst, src, len);
 461 }
 462
 463 /*******************************************************************
 464  Set the data as X-endian (external interface).
 465  ********************************************************************/
 466
 467 void prs_set_endian_data(prs_struct *ps, bool endian)
 468 {
 469         ps->bigendian_data = endian;
 470 }
 471
 472 /*******************************************************************
 473  Align a the data_len to a multiple of align bytes - filling with
 474  zeros.
 475  ********************************************************************/
 476
 477 bool prs_align(prs_struct *ps)
 478 {
 479         uint32 mod = ps->data_offset & (ps->align-1);
 480
 481         if (ps->align != 0 && mod != 0) {
 482                 uint32 extra_space = (ps->align - mod);
 483                 if(!prs_grow(ps, extra_space))
 484                         return False;
 485                 memset(&ps->data_p[ps->data_offset], '\0', (size_t)extra_space);
 486                 ps->data_offset += extra_space;
 487         }
 488
 489         return True;
 490 }
 491
 492 /******************************************************************
 493  Align on a 2 byte boundary
 494  *****************************************************************/
 495
 496 bool prs_align_uint16(prs_struct *ps)
 497 {
 498         bool ret;
 499         uint8 old_align = ps->align;
 500
 501         ps->align = 2;
 502         ret = prs_align(ps);
 503         ps->align = old_align;
 504
 505         return ret;
 506 }
 507
 508 /******************************************************************
 509  Align on a 8 byte boundary
 510  *****************************************************************/
 511
 512 bool prs_align_uint64(prs_struct *ps)
 513 {
 514         bool ret;
 515         uint8 old_align = ps->align;
 516
 517         ps->align = 8;
 518         ret = prs_align(ps);
 519         ps->align = old_align;
 520
 521         return ret;
 522 }
 523
 524 /******************************************************************
 525  Align on a specific byte boundary
 526  *****************************************************************/
 527
 528 bool prs_align_custom(prs_struct *ps, uint8 boundary)
 529 {
 530         bool ret;
 531         uint8 old_align = ps->align;
 532
 533         ps->align = boundary;
 534         ret = prs_align(ps);
 535         ps->align = old_align;
 536
 537         return ret;
 538 }
 539
 540
 541
 542 /*******************************************************************
 543  Align only if required (for the unistr2 string mainly)
 544  ********************************************************************/
 545
 546 bool prs_align_needed(prs_struct *ps, uint32 needed)
 547 {
 548         if (needed==0)
 549                 return True;
 550         else
 551                 return prs_align(ps);
 552 }
 553
 554 /*******************************************************************
 555  Ensure we can read/write to a given offset.
 556  ********************************************************************/
 557
 558 char *prs_mem_get(prs_struct *ps, uint32 extra_size)
 559 {
 560         if(UNMARSHALLING(ps)) {
 561                 /*
 562                  * If reading, ensure that we can read the requested size item.
 563                  */
 564                 if (ps->data_offset + extra_size > ps->buffer_size) {
 565                         DEBUG(0,("prs_mem_get: reading data of size %u would overrun "
 566                                 "buffer by %u bytes.\n",
 567                                 (unsigned int)extra_size,
 568                                 (unsigned int)(ps->data_offset + extra_size - ps->buffer_size) ));
 569                         return NULL;
 570                 }
 571         } else {
 572                 /*
 573                  * Writing - grow the buffer if needed.
 574                  */
 575                 if(!prs_grow(ps, extra_size))
 576                         return NULL;
 577         }
 578         return &ps->data_p[ps->data_offset];
 579 }
 580
 581 /*******************************************************************
 582  Change the struct type.
 583  ********************************************************************/
 584
 585 void prs_switch_type(prs_struct *ps, bool io)
 586 {
 587         if ((ps->io ^ io) == True)
 588                 ps->io=io;
 589 }
 590
 591 /*******************************************************************
 592  Force a prs_struct to be dynamic even when it's size is 0.
 593  ********************************************************************/
 594
 595 void prs_force_dynamic(prs_struct *ps)
 596 {
 597         ps->is_dynamic=True;
 598 }
 599
 600 /*******************************************************************
 601  Associate a session key with a parse struct.
 602  ********************************************************************/
 603
 604 void prs_set_session_key(prs_struct *ps, const char sess_key[16])
 605 {
 606         ps->sess_key = sess_key;
 607 }
 608
 609 /*******************************************************************
 610  Stream a uint8.
 611  ********************************************************************/
 612
 613 bool prs_uint8(const char *name, prs_struct *ps, int depth, uint8 *data8)
 614 {
 615         char *q = prs_mem_get(ps, 1);
 616         if (q == NULL)
 617                 return False;
 618
 619         if (UNMARSHALLING(ps))
 620                 *data8 = CVAL(q,0);
 621         else
 622                 SCVAL(q,0,*data8);
 623
 624         DEBUG(5,("%s%04x %s: %02x\n", tab_depth(5,depth), ps->data_offset, name, *data8));
 625
 626         ps->data_offset += 1;
 627
 628         return True;
 629 }
 630
 631 /*******************************************************************
 632  Stream a uint16* (allocate memory if unmarshalling)
 633  ********************************************************************/
 634
 635 bool prs_pointer( const char *name, prs_struct *ps, int depth,
 636                  void *dta, size_t data_size,
 637                  bool (*prs_fn)(const char*, prs_struct*, int, void*) )
 638 {
 639         void ** data = (void **)dta;
 640         uint32 data_p;
 641
 642         /* output f000baaa to stream if the pointer is non-zero. */
 643
 644         data_p = *data ? 0xf000baaa : 0;
 645
 646         if ( !prs_uint32("ptr", ps, depth, &data_p ))
 647                 return False;
 648
 649         /* we're done if there is no data */
 650
 651         if ( !data_p )
 652                 return True;
 653
 654         if (UNMARSHALLING(ps)) {
 655                 if (data_size) {
 656                         if ( !(*data = PRS_ALLOC_MEM(ps, char, data_size)) )
 657                                 return False;
 658                 } else {
 659                         *data = NULL;
 660                 }
 661         }
 662
 663         return prs_fn(name, ps, depth, *data);
 664 }
 665
 666
 667 /*******************************************************************
 668  Stream a uint16.
 669  ********************************************************************/
 670
 671 bool prs_uint16(const char *name, prs_struct *ps, int depth, uint16 *data16)
 672 {
 673         char *q = prs_mem_get(ps, sizeof(uint16));
 674         if (q == NULL)
 675                 return False;
 676
 677         if (UNMARSHALLING(ps)) {
 678                 if (ps->bigendian_data)
 679                         *data16 = RSVAL(q,0);
 680                 else
 681                         *data16 = SVAL(q,0);
 682         } else {
 683                 if (ps->bigendian_data)
 684                         RSSVAL(q,0,*data16);
 685                 else
 686                         SSVAL(q,0,*data16);
 687         }
 688
 689         DEBUG(5,("%s%04x %s: %04x\n", tab_depth(5,depth), ps->data_offset, name, *data16));
 690
 691         ps->data_offset += sizeof(uint16);
 692
 693         return True;
 694 }
 695
 696 /*******************************************************************
 697  Stream a uint32.
 698  ********************************************************************/
 699
 700 bool prs_uint32(const char *name, prs_struct *ps, int depth, uint32 *data32)
 701 {
 702         char *q = prs_mem_get(ps, sizeof(uint32));
 703         if (q == NULL)
 704                 return False;
 705
 706         if (UNMARSHALLING(ps)) {
 707                 if (ps->bigendian_data)
 708                         *data32 = RIVAL(q,0);
 709                 else
 710                         *data32 = IVAL(q,0);
 711         } else {
 712                 if (ps->bigendian_data)
 713                         RSIVAL(q,0,*data32);
 714                 else
 715                         SIVAL(q,0,*data32);
 716         }
 717
 718         DEBUG(5,("%s%04x %s: %08x\n", tab_depth(5,depth), ps->data_offset, name, *data32));
 719
 720         ps->data_offset += sizeof(uint32);
 721
 722         return True;
 723 }
 724
 725 /*******************************************************************
 726  Stream an int32.
 727  ********************************************************************/
 728
 729 bool prs_int32(const char *name, prs_struct *ps, int depth, int32 *data32)
 730 {
 731         char *q = prs_mem_get(ps, sizeof(int32));
 732         if (q == NULL)
 733                 return False;
 734
 735         if (UNMARSHALLING(ps)) {
 736                 if (ps->bigendian_data)
 737                         *data32 = RIVALS(q,0);
 738                 else
 739                         *data32 = IVALS(q,0);
 740         } else {
 741                 if (ps->bigendian_data)
 742                         RSIVALS(q,0,*data32);
 743                 else
 744                         SIVALS(q,0,*data32);
 745         }
 746
 747         DEBUG(5,("%s%04x %s: %08x\n", tab_depth(5,depth), ps->data_offset, name, *data32));
 748
 749         ps->data_offset += sizeof(int32);
 750
 751         return True;
 752 }
 753
 754 /*******************************************************************
 755  Stream a NTSTATUS
 756  ********************************************************************/
 757
 758 bool prs_ntstatus(const char *name, prs_struct *ps, int depth, NTSTATUS *status)
 759 {
 760         char *q = prs_mem_get(ps, sizeof(uint32));
 761         if (q == NULL)
 762                 return False;
 763
 764         if (UNMARSHALLING(ps)) {
 765                 if (ps->bigendian_data)
 766                         *status = NT_STATUS(RIVAL(q,0));
 767                 else
 768                         *status = NT_STATUS(IVAL(q,0));
 769         } else {
 770                 if (ps->bigendian_data)
 771                         RSIVAL(q,0,NT_STATUS_V(*status));
 772                 else
 773                         SIVAL(q,0,NT_STATUS_V(*status));
 774         }
 775
 776         DEBUG(5,("%s%04x %s: %s\n", tab_depth(5,depth), ps->data_offset, name,
 777                  nt_errstr(*status)));
 778
 779         ps->data_offset += sizeof(uint32);
 780
 781         return True;
 782 }
 783
 784 /*******************************************************************
 785  Stream a DCE error code
 786  ********************************************************************/
 787
 788 bool prs_dcerpc_status(const char *name, prs_struct *ps, int depth, NTSTATUS *status)
 789 {
 790         char *q = prs_mem_get(ps, sizeof(uint32));
 791         if (q == NULL)
 792                 return False;
 793
 794         if (UNMARSHALLING(ps)) {
 795                 if (ps->bigendian_data)
 796                         *status = NT_STATUS(RIVAL(q,0));
 797                 else
 798                         *status = NT_STATUS(IVAL(q,0));
 799         } else {
 800                 if (ps->bigendian_data)
 801                         RSIVAL(q,0,NT_STATUS_V(*status));
 802                 else
 803                         SIVAL(q,0,NT_STATUS_V(*status));
 804         }
 805
 806         DEBUG(5,("%s%04x %s: %s\n", tab_depth(5,depth), ps->data_offset, name,
 807                  dcerpc_errstr(NT_STATUS_V(*status))));
 808
 809         ps->data_offset += sizeof(uint32);
 810
 811         return True;
 812 }
 813
 814
 815 /*******************************************************************
 816  Stream a WERROR
 817  ********************************************************************/
 818
 819 bool prs_werror(const char *name, prs_struct *ps, int depth, WERROR *status)
 820 {
 821         char *q = prs_mem_get(ps, sizeof(uint32));
 822         if (q == NULL)
 823                 return False;
 824
 825         if (UNMARSHALLING(ps)) {
 826                 if (ps->bigendian_data)
 827                         *status = W_ERROR(RIVAL(q,0));
 828                 else
 829                         *status = W_ERROR(IVAL(q,0));
 830         } else {
 831                 if (ps->bigendian_data)
 832                         RSIVAL(q,0,W_ERROR_V(*status));
 833                 else
 834                         SIVAL(q,0,W_ERROR_V(*status));
 835         }
 836
 837         DEBUG(5,("%s%04x %s: %s\n", tab_depth(5,depth), ps->data_offset, name,
 838                  dos_errstr(*status)));
 839
 840         ps->data_offset += sizeof(uint32);
 841
 842         return True;
 843 }
 844
 845
 846 /******************************************************************
 847  Stream an array of uint8s. Length is number of uint8s.
 848  ********************************************************************/
 849
 850 bool prs_uint8s(bool charmode, const char *name, prs_struct *ps, int depth, uint8 *data8s, int len)
 851 {
 852         int i;
 853         char *q = prs_mem_get(ps, len);
 854         if (q == NULL)
 855                 return False;
 856
 857         if (UNMARSHALLING(ps)) {
 858                 for (i = 0; i < len; i++)
 859                         data8s[i] = CVAL(q,i);
 860         } else {
 861                 for (i = 0; i < len; i++)
 862                         SCVAL(q, i, data8s[i]);
 863         }
 864
 865         DEBUG(5,("%s%04x %s: ", tab_depth(5,depth), ps->data_offset ,name));
 866         if (charmode)
 867                 print_asc(5, (unsigned char*)data8s, len);
 868         else {
 869                 for (i = 0; i < len; i++)
 870                         DEBUG(5,("%02x ", data8s[i]));
 871         }
 872         DEBUG(5,("\n"));
 873
 874         ps->data_offset += len;
 875
 876         return True;
 877 }
 878
 879 /******************************************************************
 880  Stream an array of uint16s. Length is number of uint16s.
 881  ********************************************************************/
 882
 883 bool prs_uint16s(bool charmode, const char *name, prs_struct *ps, int depth, uint16 *data16s, int len)
 884 {
 885         int i;
 886         char *q = prs_mem_get(ps, len * sizeof(uint16));
 887         if (q == NULL)
 888                 return False;
 889
 890         if (UNMARSHALLING(ps)) {
 891                 if (ps->bigendian_data) {
 892                         for (i = 0; i < len; i++)
 893                                 data16s[i] = RSVAL(q, 2*i);
 894                 } else {
 895                         for (i = 0; i < len; i++)
 896                                 data16s[i] = SVAL(q, 2*i);
 897                 }
 898         } else {
 899                 if (ps->bigendian_data) {
 900                         for (i = 0; i < len; i++)
 901                                 RSSVAL(q, 2*i, data16s[i]);
 902                 } else {
 903                         for (i = 0; i < len; i++)
 904                                 SSVAL(q, 2*i, data16s[i]);
 905                 }
 906         }
 907
 908         DEBUG(5,("%s%04x %s: ", tab_depth(5,depth), ps->data_offset, name));
 909         if (charmode)
 910                 print_asc(5, (unsigned char*)data16s, 2*len);
 911         else {
 912                 for (i = 0; i < len; i++)
 913                         DEBUG(5,("%04x ", data16s[i]));
 914         }
 915         DEBUG(5,("\n"));
 916
 917         ps->data_offset += (len * sizeof(uint16));
 918
 919         return True;
 920 }
 921
 922 /******************************************************************
 923  Start using a function for streaming unicode chars. If unmarshalling,
 924  output must be little-endian, if marshalling, input must be little-endian.
 925  ********************************************************************/
 926
 927 static void dbg_rw_punival(bool charmode, const char *name, int depth, prs_struct *ps,
 928                                                         char *in_buf, char *out_buf, int len)
 929 {
 930         int i;
 931
 932         if (UNMARSHALLING(ps)) {
 933                 if (ps->bigendian_data) {
 934                         for (i = 0; i < len; i++)
 935                                 SSVAL(out_buf,2*i,RSVAL(in_buf, 2*i));
 936                 } else {
 937                         for (i = 0; i < len; i++)
 938                                 SSVAL(out_buf, 2*i, SVAL(in_buf, 2*i));
 939                 }
 940         } else {
 941                 if (ps->bigendian_data) {
 942                         for (i = 0; i < len; i++)
 943                                 RSSVAL(in_buf, 2*i, SVAL(out_buf,2*i));
 944                 } else {
 945                         for (i = 0; i < len; i++)
 946                                 SSVAL(in_buf, 2*i, SVAL(out_buf,2*i));
 947                 }
 948         }
 949
 950         DEBUG(5,("%s%04x %s: ", tab_depth(5,depth), ps->data_offset, name));
 951         if (charmode)
 952                 print_asc(5, (unsigned char*)out_buf, 2*len);
 953         else {
 954                 for (i = 0; i < len; i++)
 955                         DEBUG(5,("%04x ", out_buf[i]));
 956         }
 957         DEBUG(5,("\n"));
 958 }
 959
 960 /******************************************************************
 961  Stream a unistr. Always little endian.
 962  ********************************************************************/
 963
 964 bool prs_uint16uni(bool charmode, const char *name, prs_struct *ps, int depth, uint16 *data16s, int len)
 965 {
 966         char *q = prs_mem_get(ps, len * sizeof(uint16));
 967         if (q == NULL)
 968                 return False;
 969
 970         dbg_rw_punival(charmode, name, depth, ps, q, (char *)data16s, len);
 971         ps->data_offset += (len * sizeof(uint16));
 972
 973         return True;
 974 }
 975
 976 /******************************************************************
 977  Stream an array of uint32s. Length is number of uint32s.
 978  ********************************************************************/
 979
 980 bool prs_uint32s(bool charmode, const char *name, prs_struct *ps, int depth, uint32 *data32s, int len)
 981 {
 982         int i;
 983         char *q = prs_mem_get(ps, len * sizeof(uint32));
 984         if (q == NULL)
 985                 return False;
 986
 987         if (UNMARSHALLING(ps)) {
 988                 if (ps->bigendian_data) {
 989                         for (i = 0; i < len; i++)
 990                                 data32s[i] = RIVAL(q, 4*i);
 991                 } else {
 992                         for (i = 0; i < len; i++)
 993                                 data32s[i] = IVAL(q, 4*i);
 994                 }
 995         } else {
 996                 if (ps->bigendian_data) {
 997                         for (i = 0; i < len; i++)
 998                                 RSIVAL(q, 4*i, data32s[i]);
 999                 } else {
1000                         for (i = 0; i < len; i++)
1001                                 SIVAL(q, 4*i, data32s[i]);
1002                 }
1003         }
1004
1005         DEBUG(5,("%s%04x %s: ", tab_depth(5,depth), ps->data_offset, name));
1006         if (charmode)
1007                 print_asc(5, (unsigned char*)data32s, 4*len);
1008         else {
1009                 for (i = 0; i < len; i++)
1010                         DEBUG(5,("%08x ", data32s[i]));
1011         }
1012         DEBUG(5,("\n"));
1013
1014         ps->data_offset += (len * sizeof(uint32));
1015
1016         return True;
1017 }
1018
1019 /******************************************************************
1020  Stream an array of unicode string, length/buffer specified separately,
1021  in uint16 chars. The unicode string is already in little-endian format.
1022  ********************************************************************/
1023
1024 bool prs_buffer5(bool charmode, const char *name, prs_struct *ps, int depth, BUFFER5 *str)
1025 {
1026         char *p;
1027         char *q = prs_mem_get(ps, str->buf_len * sizeof(uint16));
1028         if (q == NULL)
1029                 return False;
1030
1031         /* If the string is empty, we don't have anything to stream */
1032         if (str->buf_len==0)
1033                 return True;
1034
1035         if (UNMARSHALLING(ps)) {
1036                 str->buffer = PRS_ALLOC_MEM(ps,uint16,str->buf_len);
1037                 if (str->buffer == NULL)
1038                         return False;
1039         }
1040
1041         p = (char *)str->buffer;
1042
1043         dbg_rw_punival(charmode, name, depth, ps, q, p, str->buf_len);
1044
1045         ps->data_offset += (str->buf_len * sizeof(uint16));
1046
1047         return True;
1048 }
1049
1050 /******************************************************************
1051  Stream a "not" unicode string, length/buffer specified separately,
1052  in byte chars. String is in little-endian format.
1053  ********************************************************************/
1054
1055 bool prs_regval_buffer(bool charmode, const char *name, prs_struct *ps, int depth, REGVAL_BUFFER *buf)
1056 {
1057         char *p;
1058         char *q = prs_mem_get(ps, buf->buf_len);
1059         if (q == NULL)
1060                 return False;
1061
1062         if (UNMARSHALLING(ps)) {
1063                 if (buf->buf_len > buf->buf_max_len) {
1064                         return False;
1065                 }
1066                 if ( buf->buf_max_len ) {
1067                         buf->buffer = PRS_ALLOC_MEM(ps, uint16, buf->buf_max_len);
1068                         if ( buf->buffer == NULL )
1069                                 return False;
1070                 } else {
1071                         buf->buffer = NULL;
1072                 }
1073         }
1074
1075         p = (char *)buf->buffer;
1076
1077         dbg_rw_punival(charmode, name, depth, ps, q, p, buf->buf_len/2);
1078         ps->data_offset += buf->buf_len;
1079
1080         return True;
1081 }
1082
1083 /******************************************************************
1084  Stream a string, length/buffer specified separately,
1085  in uint8 chars.
1086  ********************************************************************/
1087
1088 bool prs_string2(bool charmode, const char *name, prs_struct *ps, int depth, STRING2 *str)
1089 {
1090         unsigned int i;
1091         char *q = prs_mem_get(ps, str->str_str_len);
1092         if (q == NULL)
1093                 return False;
1094
1095         if (UNMARSHALLING(ps)) {
1096                 if (str->str_str_len > str->str_max_len) {
1097                         return False;
1098                 }
1099                 if (str->str_max_len) {
1100                         str->buffer = PRS_ALLOC_MEM(ps,unsigned char, str->str_max_len);
1101                         if (str->buffer == NULL)
1102                                 return False;
1103                 } else {
1104                         str->buffer = NULL;
1105                         /* Return early to ensure Coverity isn't confused. */
1106                         DEBUG(5,("%s%04x %s: \n", tab_depth(5,depth), ps->data_offset, name));
1107                         return True;
1108                 }
1109         }
1110
1111         if (UNMARSHALLING(ps)) {
1112                 for (i = 0; i < str->str_str_len; i++)
1113                         str->buffer[i] = CVAL(q,i);
1114         } else {
1115                 for (i = 0; i < str->str_str_len; i++)
1116                         SCVAL(q, i, str->buffer[i]);
1117         }
1118
1119         DEBUG(5,("%s%04x %s: ", tab_depth(5,depth), ps->data_offset, name));
1120         if (charmode)
1121                 print_asc(5, (unsigned char*)str->buffer, str->str_str_len);
1122         else {
1123                 for (i = 0; i < str->str_str_len; i++)
1124                         DEBUG(5,("%02x ", str->buffer[i]));
1125         }
1126         DEBUG(5,("\n"));
1127
1128         ps->data_offset += str->str_str_len;
1129
1130         return True;
1131 }
1132
1133 /******************************************************************
1134  Stream a unicode string, length/buffer specified separately,
1135  in uint16 chars. The unicode string is already in little-endian format.
1136  ********************************************************************/
1137
1138 bool prs_unistr2(bool charmode, const char *name, prs_struct *ps, int depth, UNISTR2 *str)
1139 {
1140         char *p;
1141         char *q = prs_mem_get(ps, str->uni_str_len * sizeof(uint16));
1142         if (q == NULL)
1143                 return False;
1144
1145         /* If the string is empty, we don't have anything to stream */
1146         if (str->uni_str_len==0)
1147                 return True;
1148
1149         if (UNMARSHALLING(ps)) {
1150                 if (str->uni_str_len > str->uni_max_len) {
1151                         return False;
1152                 }
1153                 if (str->uni_max_len) {
1154                         str->buffer = PRS_ALLOC_MEM(ps,uint16,str->uni_max_len);
1155                         if (str->buffer == NULL)
1156                                 return False;
1157                 } else {
1158                         str->buffer = NULL;
1159                 }
1160         }
1161
1162         p = (char *)str->buffer;
1163
1164         dbg_rw_punival(charmode, name, depth, ps, q, p, str->uni_str_len);
1165
1166         ps->data_offset += (str->uni_str_len * sizeof(uint16));
1167
1168         return True;
1169 }
1170
1171 /******************************************************************
1172  Stream a unicode string, length/buffer specified separately,
1173  in uint16 chars. The unicode string is already in little-endian format.
1174  ********************************************************************/
1175
1176 bool prs_unistr3(bool charmode, const char *name, UNISTR3 *str, prs_struct *ps, int depth)
1177 {
1178         char *p;
1179         char *q = prs_mem_get(ps, str->uni_str_len * sizeof(uint16));
1180         if (q == NULL)
1181                 return False;
1182
1183         if (UNMARSHALLING(ps)) {
1184                 if (str->uni_str_len) {
1185                         str->str.buffer = PRS_ALLOC_MEM(ps,uint16,str->uni_str_len);
1186                         if (str->str.buffer == NULL)
1187                                 return False;
1188                 } else {
1189                         str->str.buffer = NULL;
1190                 }
1191         }
1192
1193         p = (char *)str->str.buffer;
1194
1195         dbg_rw_punival(charmode, name, depth, ps, q, p, str->uni_str_len);
1196         ps->data_offset += (str->uni_str_len * sizeof(uint16));
1197
1198         return True;
1199 }
1200
1201 /*******************************************************************
1202  Stream a unicode  null-terminated string. As the string is already
1203  in little-endian format then do it as a stream of bytes.
1204  ********************************************************************/
1205
1206 bool prs_unistr(const char *name, prs_struct *ps, int depth, UNISTR *str)
1207 {
1208         unsigned int len = 0;
1209         unsigned char *p = (unsigned char *)str->buffer;
1210         uint8 *start;
1211         char *q;
1212         uint32 max_len;
1213         uint16* ptr;
1214
1215         if (MARSHALLING(ps)) {
1216
1217                 for(len = 0; str->buffer[len] != 0; len++)
1218                         ;
1219
1220                 q = prs_mem_get(ps, (len+1)*2);
1221                 if (q == NULL)
1222                         return False;
1223
1224                 start = (uint8*)q;
1225
1226                 for(len = 0; str->buffer[len] != 0; len++) {
1227                         if(ps->bigendian_data) {
1228                                 /* swap bytes - p is little endian, q is big endian. */
1229                                 q[0] = (char)p[1];
1230                                 q[1] = (char)p[0];
1231                                 p += 2;
1232                                 q += 2;
1233                         }
1234                         else
1235                         {
1236                                 q[0] = (char)p[0];
1237                                 q[1] = (char)p[1];
1238                                 p += 2;
1239                                 q += 2;
1240                         }
1241                 }
1242
1243                 /*
1244                  * even if the string is 'empty' (only an \0 char)
1245                  * at this point the leading \0 hasn't been parsed.
1246                  * so parse it now
1247                  */
1248
1249                 q[0] = 0;
1250                 q[1] = 0;
1251                 q += 2;
1252
1253                 len++;
1254
1255                 DEBUG(5,("%s%04x %s: ", tab_depth(5,depth), ps->data_offset, name));
1256                 print_asc(5, (unsigned char*)start, 2*len);
1257                 DEBUG(5, ("\n"));
1258         }
1259         else { /* unmarshalling */
1260
1261                 uint32 alloc_len = 0;
1262                 q = ps->data_p + prs_offset(ps);
1263
1264                 /*
1265                  * Work out how much space we need and talloc it.
1266                  */
1267                 max_len = (ps->buffer_size - ps->data_offset)/sizeof(uint16);
1268
1269                 /* the test of the value of *ptr helps to catch the circumstance
1270                    where we have an emtpty (non-existent) string in the buffer */
1271                 for ( ptr = (uint16 *)q; *ptr++ && (alloc_len <= max_len); alloc_len++)
1272                         /* do nothing */
1273                         ;
1274
1275                 if (alloc_len < max_len)
1276                         alloc_len += 1;
1277
1278                 /* should we allocate anything at all? */
1279                 str->buffer = PRS_ALLOC_MEM(ps,uint16,alloc_len);
1280                 if ((str->buffer == NULL) && (alloc_len > 0))
1281                         return False;
1282
1283                 p = (unsigned char *)str->buffer;
1284
1285                 len = 0;
1286                 /* the (len < alloc_len) test is to prevent us from overwriting
1287                    memory that is not ours...if we get that far, we have a non-null
1288                    terminated string in the buffer and have messed up somewhere */
1289                 while ((len < alloc_len) && (*(uint16 *)q != 0)) {
1290                         if(ps->bigendian_data)
1291                         {
1292                                 /* swap bytes - q is big endian, p is little endian. */
1293                                 p[0] = (unsigned char)q[1];
1294                                 p[1] = (unsigned char)q[0];
1295                                 p += 2;
1296                                 q += 2;
1297                         } else {
1298
1299                                 p[0] = (unsigned char)q[0];
1300                                 p[1] = (unsigned char)q[1];
1301                                 p += 2;
1302                                 q += 2;
1303                         }
1304
1305                         len++;
1306                 }
1307                 if (len < alloc_len) {
1308                         /* NULL terminate the UNISTR */
1309                         str->buffer[len++] = '\0';
1310                 }
1311
1312                 DEBUG(5,("%s%04x %s: ", tab_depth(5,depth), ps->data_offset, name));
1313                 print_asc(5, (unsigned char*)str->buffer, 2*len);
1314                 DEBUG(5, ("\n"));
1315         }
1316
1317         /* set the offset in the prs_struct; 'len' points to the
1318            terminiating NULL in the UNISTR so we need to go one more
1319            uint16 */
1320         ps->data_offset += (len)*2;
1321
1322         return True;
1323 }
1324
1325
1326 /*******************************************************************
1327  Stream a null-terminated string.  len is strlen, and therefore does
1328  not include the null-termination character.
1329  ********************************************************************/
1330
1331 bool prs_string(const char *name, prs_struct *ps, int depth, char *str, int max_buf_size)
1332 {
1333         char *q;
1334         int i;
1335         int len;
1336
1337         if (UNMARSHALLING(ps))
1338                 len = strlen(&ps->data_p[ps->data_offset]);
1339         else
1340                 len = strlen(str);
1341
1342         len = MIN(len, (max_buf_size-1));
1343
1344         q = prs_mem_get(ps, len+1);
1345         if (q == NULL)
1346                 return False;
1347
1348         for(i = 0; i < len; i++) {
1349                 if (UNMARSHALLING(ps))
1350                         str[i] = q[i];
1351                 else
1352                         q[i] = str[i];
1353         }
1354
1355         /* The terminating null. */
1356         str[i] = '\0';
1357
1358         if (MARSHALLING(ps)) {
1359                 q[i] = '\0';
1360         }
1361
1362         ps->data_offset += len+1;
1363
1364         dump_data(5+depth, (uint8 *)q, len);
1365
1366         return True;
1367 }
1368
1369 bool prs_string_alloc(const char *name, prs_struct *ps, int depth, const char **str)
1370 {
1371         size_t len;
1372         char *tmp_str;
1373
1374         if (UNMARSHALLING(ps)) {
1375                 len = strlen(&ps->data_p[ps->data_offset]);
1376         } else {
1377                 len = strlen(*str);
1378         }
1379
1380         tmp_str = PRS_ALLOC_MEM(ps, char, len+1);
1381
1382         if (tmp_str == NULL) {
1383                 return False;
1384         }
1385
1386         if (MARSHALLING(ps)) {
1387                 strncpy(tmp_str, *str, len);
1388         }
1389
1390         if (!prs_string(name, ps, depth, tmp_str, len+1)) {
1391                 return False;
1392         }
1393
1394         *str = tmp_str;
1395         return True;
1396 }
1397
1398 /*******************************************************************
1399  prs_uint16 wrapper. Call this and it sets up a pointer to where the
1400  uint16 should be stored, or gets the size if reading.
1401  ********************************************************************/
1402
1403 bool prs_uint16_pre(const char *name, prs_struct *ps, int depth, uint16 *data16, uint32 *offset)
1404 {
1405         *offset = ps->data_offset;
1406         if (UNMARSHALLING(ps)) {
1407                 /* reading. */
1408                 return prs_uint16(name, ps, depth, data16);
1409         } else {
1410                 char *q = prs_mem_get(ps, sizeof(uint16));
1411                 if(q ==NULL)
1412                         return False;
1413                 ps->data_offset += sizeof(uint16);
1414         }
1415         return True;
1416 }
1417
1418 /*******************************************************************
1419  prs_uint16 wrapper.  call this and it retrospectively stores the size.
1420  does nothing on reading, as that is already handled by ...._pre()
1421  ********************************************************************/
1422
1423 bool prs_uint16_post(const char *name, prs_struct *ps, int depth, uint16 *data16,
1424                                 uint32 ptr_uint16, uint32 start_offset)
1425 {
1426         if (MARSHALLING(ps)) {
1427                 /*
1428                  * Writing - temporarily move the offset pointer.
1429                  */
1430                 uint16 data_size = ps->data_offset - start_offset;
1431                 uint32 old_offset = ps->data_offset;
1432
1433                 ps->data_offset = ptr_uint16;
1434                 if(!prs_uint16(name, ps, depth, &data_size)) {
1435                         ps->data_offset = old_offset;
1436                         return False;
1437                 }
1438                 ps->data_offset = old_offset;
1439         } else {
1440                 ps->data_offset = start_offset + (uint32)(*data16);
1441         }
1442         return True;
1443 }
1444
1445 /*******************************************************************
1446  prs_uint32 wrapper. Call this and it sets up a pointer to where the
1447  uint32 should be stored, or gets the size if reading.
1448  ********************************************************************/
1449
1450 bool prs_uint32_pre(const char *name, prs_struct *ps, int depth, uint32 *data32, uint32 *offset)
1451 {
1452         *offset = ps->data_offset;
1453         if (UNMARSHALLING(ps) && (data32 != NULL)) {
1454                 /* reading. */
1455                 return prs_uint32(name, ps, depth, data32);
1456         } else {
1457                 ps->data_offset += sizeof(uint32);
1458         }
1459         return True;
1460 }
1461
1462 /*******************************************************************
1463  prs_uint32 wrapper.  call this and it retrospectively stores the size.
1464  does nothing on reading, as that is already handled by ...._pre()
1465  ********************************************************************/
1466
1467 bool prs_uint32_post(const char *name, prs_struct *ps, int depth, uint32 *data32,
1468                                 uint32 ptr_uint32, uint32 data_size)
1469 {
1470         if (MARSHALLING(ps)) {
1471                 /*
1472                  * Writing - temporarily move the offset pointer.
1473                  */
1474                 uint32 old_offset = ps->data_offset;
1475                 ps->data_offset = ptr_uint32;
1476                 if(!prs_uint32(name, ps, depth, &data_size)) {
1477                         ps->data_offset = old_offset;
1478                         return False;
1479                 }
1480                 ps->data_offset = old_offset;
1481         }
1482         return True;
1483 }
1484
1485 /* useful function to store a structure in rpc wire format */
1486 int tdb_prs_store(TDB_CONTEXT *tdb, TDB_DATA kbuf, prs_struct *ps)
1487 {
1488         TDB_DATA dbuf;
1489         dbuf.dptr = (uint8 *)ps->data_p;
1490         dbuf.dsize = prs_offset(ps);
1491         return tdb_trans_store(tdb, kbuf, dbuf, TDB_REPLACE);
1492 }
1493
1494 /* useful function to fetch a structure into rpc wire format */
1495 int tdb_prs_fetch(TDB_CONTEXT *tdb, TDB_DATA kbuf, prs_struct *ps, TALLOC_CTX *mem_ctx)
1496 {
1497         TDB_DATA dbuf;
1498
1499         prs_init(ps, 0, mem_ctx, UNMARSHALL);
1500
1501         dbuf = tdb_fetch(tdb, kbuf);
1502         if (!dbuf.dptr)
1503                 return -1;
1504
1505         prs_give_memory(ps, (char *)dbuf.dptr, dbuf.dsize, True);
1506
1507         return 0;
1508 }
1509
1510 /*******************************************************************
1511  hash a stream.
1512  ********************************************************************/
1513
1514 bool prs_hash1(prs_struct *ps, uint32 offset, int len)
1515 {
1516         char *q;
1517
1518         q = ps->data_p;
1519         q = &q[offset];
1520
1521 #ifdef DEBUG_PASSWORD
1522         DEBUG(100, ("prs_hash1\n"));
1523         dump_data(100, (uint8 *)ps->sess_key, 16);
1524         dump_data(100, (uint8 *)q, len);
1525 #endif
1526         SamOEMhash((uchar *) q, (const unsigned char *)ps->sess_key, len);
1527
1528 #ifdef DEBUG_PASSWORD
1529         dump_data(100, (uint8 *)q, len);
1530 #endif
1531
1532         return True;
1533 }
1534
1535 /*******************************************************************
1536  Create a digest over the entire packet (including the data), and
1537  MD5 it with the session key.
1538  ********************************************************************/
1539
1540 static void schannel_digest(struct schannel_auth_struct *a,
1541                           enum pipe_auth_level auth_level,
1542                           RPC_AUTH_SCHANNEL_CHK * verf,
1543                           char *data, size_t data_len,
1544                           uchar digest_final[16])
1545 {
1546         uchar whole_packet_digest[16];
1547         uchar zeros[4];
1548         struct MD5Context ctx3;
1549
1550         ZERO_STRUCT(zeros);
1551
1552         /* verfiy the signature on the packet by MD5 over various bits */
1553         MD5Init(&ctx3);
1554         /* use our sequence number, which ensures the packet is not
1555            out of order */
1556         MD5Update(&ctx3, zeros, sizeof(zeros));
1557         MD5Update(&ctx3, verf->sig, sizeof(verf->sig));
1558         if (auth_level == PIPE_AUTH_LEVEL_PRIVACY) {
1559                 MD5Update(&ctx3, verf->confounder, sizeof(verf->confounder));
1560         }
1561         MD5Update(&ctx3, (const unsigned char *)data, data_len);
1562         MD5Final(whole_packet_digest, &ctx3);
1563         dump_data_pw("whole_packet_digest:\n", whole_packet_digest, sizeof(whole_packet_digest));
1564
1565         /* MD5 this result and the session key, to prove that
1566            only a valid client could had produced this */
1567         hmac_md5(a->sess_key, whole_packet_digest, sizeof(whole_packet_digest), digest_final);
1568 }
1569
1570 /*******************************************************************
1571  Calculate the key with which to encode the data payload
1572  ********************************************************************/
1573
1574 static void schannel_get_sealing_key(struct schannel_auth_struct *a,
1575                                    RPC_AUTH_SCHANNEL_CHK *verf,
1576                                    uchar sealing_key[16])
1577 {
1578         uchar zeros[4];
1579         uchar digest2[16];
1580         uchar sess_kf0[16];
1581         int i;
1582
1583         ZERO_STRUCT(zeros);
1584
1585         for (i = 0; i < sizeof(sess_kf0); i++) {
1586                 sess_kf0[i] = a->sess_key[i] ^ 0xf0;
1587         }
1588
1589         dump_data_pw("sess_kf0:\n", sess_kf0, sizeof(sess_kf0));
1590
1591         /* MD5 of sess_kf0 and 4 zero bytes */
1592         hmac_md5(sess_kf0, zeros, 0x4, digest2);
1593         dump_data_pw("digest2:\n", digest2, sizeof(digest2));
1594
1595         /* MD5 of the above result, plus 8 bytes of sequence number */
1596         hmac_md5(digest2, verf->seq_num, sizeof(verf->seq_num), sealing_key);
1597         dump_data_pw("sealing_key:\n", sealing_key, 16);
1598 }
1599
1600 /*******************************************************************
1601  Encode or Decode the sequence number (which is symmetric)
1602  ********************************************************************/
1603
1604 static void schannel_deal_with_seq_num(struct schannel_auth_struct *a,
1605                                      RPC_AUTH_SCHANNEL_CHK *verf)
1606 {
1607         uchar zeros[4];
1608         uchar sequence_key[16];
1609         uchar digest1[16];
1610
1611         ZERO_STRUCT(zeros);
1612
1613         hmac_md5(a->sess_key, zeros, sizeof(zeros), digest1);
1614         dump_data_pw("(sequence key) digest1:\n", digest1, sizeof(digest1));
1615
1616         hmac_md5(digest1, verf->packet_digest, 8, sequence_key);
1617
1618         dump_data_pw("sequence_key:\n", sequence_key, sizeof(sequence_key));
1619
1620         dump_data_pw("seq_num (before):\n", verf->seq_num, sizeof(verf->seq_num));
1621         SamOEMhash(verf->seq_num, sequence_key, 8);
1622         dump_data_pw("seq_num (after):\n", verf->seq_num, sizeof(verf->seq_num));
1623 }
1624
1625 /*******************************************************************
1626 creates an RPC_AUTH_SCHANNEL_CHK structure.
1627 ********************************************************************/
1628
1629 static bool init_rpc_auth_schannel_chk(RPC_AUTH_SCHANNEL_CHK * chk,
1630                               const uchar sig[8],
1631                               const uchar packet_digest[8],
1632                               const uchar seq_num[8], const uchar confounder[8])
1633 {
1634         if (chk == NULL)
1635                 return False;
1636
1637         memcpy(chk->sig, sig, sizeof(chk->sig));
1638         memcpy(chk->packet_digest, packet_digest, sizeof(chk->packet_digest));
1639         memcpy(chk->seq_num, seq_num, sizeof(chk->seq_num));
1640         memcpy(chk->confounder, confounder, sizeof(chk->confounder));
1641
1642         return True;
1643 }
1644
1645 /*******************************************************************
1646  Encode a blob of data using the schannel alogrithm, also produceing
1647  a checksum over the original data.  We currently only support
1648  signing and sealing togeather - the signing-only code is close, but not
1649  quite compatible with what MS does.
1650  ********************************************************************/
1651
1652 void schannel_encode(struct schannel_auth_struct *a, enum pipe_auth_level auth_level,
1653                    enum schannel_direction direction,
1654                    RPC_AUTH_SCHANNEL_CHK * verf,
1655                    char *data, size_t data_len)
1656 {
1657         uchar digest_final[16];
1658         uchar confounder[8];
1659         uchar seq_num[8];
1660         static const uchar nullbytes[8] = { 0, };
1661
1662         static const uchar schannel_seal_sig[8] = SCHANNEL_SEAL_SIGNATURE;
1663         static const uchar schannel_sign_sig[8] = SCHANNEL_SIGN_SIGNATURE;
1664         const uchar *schannel_sig = NULL;
1665
1666         DEBUG(10,("SCHANNEL: schannel_encode seq_num=%d data_len=%lu\n", a->seq_num, (unsigned long)data_len));
1667
1668         if (auth_level == PIPE_AUTH_LEVEL_PRIVACY) {
1669                 schannel_sig = schannel_seal_sig;
1670         } else {
1671                 schannel_sig = schannel_sign_sig;
1672         }
1673
1674         /* fill the 'confounder' with random data */
1675         generate_random_buffer(confounder, sizeof(confounder));
1676
1677         dump_data_pw("a->sess_key:\n", a->sess_key, sizeof(a->sess_key));
1678
1679         RSIVAL(seq_num, 0, a->seq_num);
1680
1681         switch (direction) {
1682         case SENDER_IS_INITIATOR:
1683                 SIVAL(seq_num, 4, 0x80);
1684                 break;
1685         case SENDER_IS_ACCEPTOR:
1686                 SIVAL(seq_num, 4, 0x0);
1687                 break;
1688         }
1689
1690         dump_data_pw("verf->seq_num:\n", seq_num, sizeof(verf->seq_num));
1691
1692         init_rpc_auth_schannel_chk(verf, schannel_sig, nullbytes,
1693                                  seq_num, confounder);
1694
1695         /* produce a digest of the packet to prove it's legit (before we seal it) */
1696         schannel_digest(a, auth_level, verf, data, data_len, digest_final);
1697         memcpy(verf->packet_digest, digest_final, sizeof(verf->packet_digest));
1698
1699         if (auth_level == PIPE_AUTH_LEVEL_PRIVACY) {
1700                 uchar sealing_key[16];
1701
1702                 /* get the key to encode the data with */
1703                 schannel_get_sealing_key(a, verf, sealing_key);
1704
1705                 /* encode the verification data */
1706                 dump_data_pw("verf->confounder:\n", verf->confounder, sizeof(verf->confounder));
1707                 SamOEMhash(verf->confounder, sealing_key, 8);
1708
1709                 dump_data_pw("verf->confounder_enc:\n", verf->confounder, sizeof(verf->confounder));
1710
1711                 /* encode the packet payload */
1712                 dump_data_pw("data:\n", (const unsigned char *)data, data_len);
1713                 SamOEMhash((unsigned char *)data, sealing_key, data_len);
1714                 dump_data_pw("data_enc:\n", (const unsigned char *)data, data_len);
1715         }
1716
1717         /* encode the sequence number (key based on packet digest) */
1718         /* needs to be done after the sealing, as the original version
1719            is used in the sealing stuff... */
1720         schannel_deal_with_seq_num(a, verf);
1721
1722         return;
1723 }
1724
1725 /*******************************************************************
1726  Decode a blob of data using the schannel alogrithm, also verifiying
1727  a checksum over the original data.  We currently can verify signed messages,
1728  as well as decode sealed messages
1729  ********************************************************************/
1730
1731 bool schannel_decode(struct schannel_auth_struct *a, enum pipe_auth_level auth_level,
1732                    enum schannel_direction direction,
1733                    RPC_AUTH_SCHANNEL_CHK * verf, char *data, size_t data_len)
1734 {
1735         uchar digest_final[16];
1736
1737         static const uchar schannel_seal_sig[8] = SCHANNEL_SEAL_SIGNATURE;
1738         static const uchar schannel_sign_sig[8] = SCHANNEL_SIGN_SIGNATURE;
1739         const uchar *schannel_sig = NULL;
1740
1741         uchar seq_num[8];
1742
1743         DEBUG(10,("SCHANNEL: schannel_decode seq_num=%d data_len=%lu\n", a->seq_num, (unsigned long)data_len));
1744
1745         if (auth_level == PIPE_AUTH_LEVEL_PRIVACY) {
1746                 schannel_sig = schannel_seal_sig;
1747         } else {
1748                 schannel_sig = schannel_sign_sig;
1749         }
1750
1751         /* Create the expected sequence number for comparison */
1752         RSIVAL(seq_num, 0, a->seq_num);
1753
1754         switch (direction) {
1755         case SENDER_IS_INITIATOR:
1756                 SIVAL(seq_num, 4, 0x80);
1757                 break;
1758         case SENDER_IS_ACCEPTOR:
1759                 SIVAL(seq_num, 4, 0x0);
1760                 break;
1761         }
1762
1763         DEBUG(10,("SCHANNEL: schannel_decode seq_num=%d data_len=%lu\n", a->seq_num, (unsigned long)data_len));
1764         dump_data_pw("a->sess_key:\n", a->sess_key, sizeof(a->sess_key));
1765
1766         dump_data_pw("seq_num:\n", seq_num, sizeof(seq_num));
1767
1768         /* extract the sequence number (key based on supplied packet digest) */
1769         /* needs to be done before the sealing, as the original version
1770            is used in the sealing stuff... */
1771         schannel_deal_with_seq_num(a, verf);
1772
1773         if (memcmp(verf->seq_num, seq_num, sizeof(seq_num))) {
1774                 /* don't even bother with the below if the sequence number is out */
1775                 /* The sequence number is MD5'ed with a key based on the whole-packet
1776                    digest, as supplied by the client.  We check that it's a valid
1777                    checksum after the decode, below
1778                 */
1779                 DEBUG(2, ("schannel_decode: FAILED: packet sequence number:\n"));
1780                 dump_data(2, verf->seq_num, sizeof(verf->seq_num));
1781                 DEBUG(2, ("should be:\n"));
1782                 dump_data(2, seq_num, sizeof(seq_num));
1783
1784                 return False;
1785         }
1786
1787         if (memcmp(verf->sig, schannel_sig, sizeof(verf->sig))) {
1788                 /* Validate that the other end sent the expected header */
1789                 DEBUG(2, ("schannel_decode: FAILED: packet header:\n"));
1790                 dump_data(2, verf->sig, sizeof(verf->sig));
1791                 DEBUG(2, ("should be:\n"));
1792                 dump_data(2, schannel_sig, sizeof(schannel_sig));
1793                 return False;
1794         }
1795
1796         if (auth_level == PIPE_AUTH_LEVEL_PRIVACY) {
1797                 uchar sealing_key[16];
1798
1799                 /* get the key to extract the data with */
1800                 schannel_get_sealing_key(a, verf, sealing_key);
1801
1802                 /* extract the verification data */
1803                 dump_data_pw("verf->confounder:\n", verf->confounder,
1804                              sizeof(verf->confounder));
1805                 SamOEMhash(verf->confounder, sealing_key, 8);
1806
1807                 dump_data_pw("verf->confounder_dec:\n", verf->confounder,
1808                              sizeof(verf->confounder));
1809
1810                 /* extract the packet payload */
1811                 dump_data_pw("data   :\n", (const unsigned char *)data, data_len);
1812                 SamOEMhash((unsigned char *)data, sealing_key, data_len);
1813                 dump_data_pw("datadec:\n", (const unsigned char *)data, data_len);
1814         }
1815
1816         /* digest includes 'data' after unsealing */
1817         schannel_digest(a, auth_level, verf, data, data_len, digest_final);
1818
1819         dump_data_pw("Calculated digest:\n", digest_final,
1820                      sizeof(digest_final));
1821         dump_data_pw("verf->packet_digest:\n", verf->packet_digest,
1822                      sizeof(verf->packet_digest));
1823
1824         /* compare - if the client got the same result as us, then
1825            it must know the session key */
1826         return (memcmp(digest_final, verf->packet_digest,
1827                        sizeof(verf->packet_digest)) == 0);
1828 }
1829
1830 /*******************************************************************
1831 creates a new prs_struct containing a DATA_BLOB
1832 ********************************************************************/
1833 bool prs_init_data_blob(prs_struct *prs, DATA_BLOB *blob, TALLOC_CTX *mem_ctx)
1834 {
1835         if (!prs_init( prs, RPC_MAX_PDU_FRAG_LEN, mem_ctx, MARSHALL ))
1836                 return False;
1837
1838
1839         if (!prs_copy_data_in(prs, (char *)blob->data, blob->length))
1840                 return False;
1841
1842         return True;
1843 }
1844
1845 /*******************************************************************
1846 return the contents of a prs_struct in a DATA_BLOB
1847 ********************************************************************/
1848 bool prs_data_blob(prs_struct *prs, DATA_BLOB *blob, TALLOC_CTX *mem_ctx)
1849 {
1850         blob->length = prs_data_size(prs);
1851         blob->data = (uint8 *)TALLOC_ZERO_SIZE(mem_ctx, blob->length);
1852
1853         /* set the pointer at the end of the buffer */
1854         prs_set_offset( prs, prs_data_size(prs) );
1855
1856         if (!prs_copy_all_data_out((char *)blob->data, prs))
1857                 return False;
1858
1859         return True;
1860 }