source/rpc_parse/parse_prs.c

   1 /*
   2    Unix SMB/Netbios implementation.
   3    Version 1.9.
   4    Samba memory buffer functions
   5    Copyright (C) Andrew Tridgell              1992-1997
   6    Copyright (C) Luke Kenneth Casson Leighton 1996-1997
   7    Copyright (C) Jeremy Allison 1999.
   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 2 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, write to the Free Software
  21    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22 */
  23
  24 #include "includes.h"
  25
  26 /*******************************************************************
  27 dump a prs to a file
  28  ********************************************************************/
  29 void prs_dump(char *name, int v, prs_struct *ps)
  30 {
  31         int fd, i;
  32         pstring fname;
  33         if (DEBUGLEVEL < 50) return;
  34         for (i=1;i<100;i++) {
  35                 if (v != -1) {
  36                         slprintf(fname,sizeof(fname)-1, "/tmp/%s_%d.%d.prs", name, v, i);
  37                 } else {
  38                         slprintf(fname,sizeof(fname)-1, "/tmp/%s.%d.prs", name, i);
  39                 }
  40                 fd = open(fname, O_WRONLY|O_CREAT|O_EXCL, 0644);
  41                 if (fd != -1 || errno != EEXIST) break;
  42         }
  43         if (fd != -1) {
  44                 write(fd, ps->data_p + ps->data_offset, ps->buffer_size - ps->data_offset);
  45                 close(fd);
  46                 DEBUG(0,("created %s\n", fname));
  47         }
  48 }
  49
  50
  51
  52 /*******************************************************************
  53  debug output for parsing info.
  54
  55  XXXX side-effect of this function is to increase the debug depth XXXX
  56
  57  ********************************************************************/
  58 void prs_debug(prs_struct *ps, int depth, char *desc, char *fn_name)
  59 {
  60         DEBUG(5+depth, ("%s%06x %s %s\n", tab_depth(depth), ps->data_offset, fn_name, desc));
  61 }
  62
  63
  64 /**
  65  * Initialise an expandable parse structure.
  66  *
  67  * @param size Initial buffer size.  If >0, a new buffer will be
  68  * created with malloc().
  69  *
  70  * @return False if allocation fails, otherwise True.
  71  **/
  72 BOOL prs_init(prs_struct *ps, uint32 size, TALLOC_CTX *ctx, BOOL io)
  73 {
  74         ZERO_STRUCTP(ps);
  75         ps->io = io;
  76         ps->bigendian_data = RPC_LITTLE_ENDIAN;
  77         ps->align = RPC_PARSE_ALIGN;
  78         ps->is_dynamic = False;
  79         ps->data_offset = 0;
  80         ps->buffer_size = 0;
  81         ps->data_p = NULL;
  82         ps->mem_ctx = ctx;
  83
  84         if (size != 0) {
  85                 ps->buffer_size = size;
  86                 if((ps->data_p = (char *)malloc((size_t)size)) == NULL) {
  87                         DEBUG(0,("prs_init: malloc fail for %u bytes.\n", (unsigned int)size));
  88                         return False;
  89                 }
  90                 memset(ps->data_p, '\0', (size_t)size);
  91                 ps->is_dynamic = True; /* We own this memory. */
  92         }
  93
  94         return True;
  95 }
  96
  97 /*******************************************************************
  98  read from a socket into memory.
  99  ********************************************************************/
 100 BOOL prs_read(prs_struct *ps, int fd, size_t len, int timeout)
 101 {
 102         BOOL ok;
 103         size_t prev_size = ps->buffer_size;
 104         if (!prs_grow(ps, len))
 105                 return False;
 106
 107         if (timeout > 0) {
 108                 ok = (read_with_timeout(fd, &ps->data_p[prev_size],
 109                                             len, len,timeout) == len);
 110         } else {
 111                 ok = (read_data(fd, &ps->data_p[prev_size], len) == len);
 112         }
 113         return ok;
 114 }
 115
 116 /*******************************************************************
 117  Delete the memory in a parse structure - if we own it.
 118  ********************************************************************/
 119
 120 void prs_mem_free(prs_struct *ps)
 121 {
 122         if(ps->is_dynamic)
 123                 SAFE_FREE(ps->data_p);
 124         ps->is_dynamic = False;
 125         ps->buffer_size = 0;
 126         ps->data_offset = 0;
 127 }
 128
 129 /*******************************************************************
 130  Clear the memory in a parse structure.
 131  ********************************************************************/
 132
 133 void prs_mem_clear(prs_struct *ps)
 134 {
 135         memset(ps->data_p, '\0', (size_t)ps->buffer_size);
 136 }
 137
 138 /*******************************************************************
 139  Allocate memory when unmarshalling... Always zero clears.
 140  ********************************************************************/
 141
 142 char *prs_alloc_mem(prs_struct *ps, size_t size)
 143 {
 144         char *ret = talloc(ps->mem_ctx, size);
 145
 146         if (ret)
 147                 memset(ret, '\0', size);
 148
 149         return ret;
 150 }
 151
 152 /*******************************************************************
 153  Return the current talloc context we're using.
 154  ********************************************************************/
 155
 156 TALLOC_CTX *prs_get_mem_context(prs_struct *ps)
 157 {
 158         return ps->mem_ctx;
 159 }
 160
 161 /*******************************************************************
 162  Hand some already allocated memory to a prs_struct.
 163  ********************************************************************/
 164
 165 void prs_give_memory(prs_struct *ps, char *buf, uint32 size, BOOL is_dynamic)
 166 {
 167         ps->is_dynamic = is_dynamic;
 168         ps->data_p = buf;
 169         ps->buffer_size = size;
 170 }
 171
 172 /*******************************************************************
 173  Take some memory back from a prs_struct.
 174  ********************************************************************/
 175
 176 char *prs_take_memory(prs_struct *ps, uint32 *psize)
 177 {
 178         char *ret = ps->data_p;
 179         if(psize)
 180                 *psize = ps->buffer_size;
 181         ps->is_dynamic = False;
 182         prs_mem_free(ps);
 183         return ret;
 184 }
 185
 186 /*******************************************************************
 187  Set a prs_struct to exactly a given size. Will grow or tuncate if neccessary.
 188  ********************************************************************/
 189
 190 BOOL prs_set_buffer_size(prs_struct *ps, uint32 newsize)
 191 {
 192         if (newsize > ps->buffer_size)
 193                 return prs_force_grow(ps, newsize - ps->buffer_size);
 194
 195         if (newsize < ps->buffer_size) {
 196                 char *new_data_p = Realloc(ps->data_p, newsize);
 197                 /* if newsize is zero, Realloc acts like free() & returns NULL*/
 198                 if (new_data_p == NULL && newsize != 0) {
 199                         DEBUG(0,("prs_set_buffer_size: Realloc failure for size %u.\n",
 200                                 (unsigned int)newsize));
 201                         DEBUG(0,("prs_set_buffer_size: Reason %s\n",strerror(errno)));
 202                         return False;
 203                 }
 204                 ps->data_p = new_data_p;
 205                 ps->buffer_size = newsize;
 206         }
 207
 208         return True;
 209 }
 210
 211 /*******************************************************************
 212  Attempt, if needed, to grow a data buffer.
 213  Also depends on the data stream mode (io).
 214  ********************************************************************/
 215
 216 BOOL prs_grow(prs_struct *ps, uint32 extra_space)
 217 {
 218         uint32 new_size;
 219         char *new_data;
 220
 221         ps->grow_size = MAX(ps->grow_size, ps->data_offset + extra_space);
 222
 223         if(ps->data_offset + extra_space <= ps->buffer_size)
 224                 return True;
 225
 226         /*
 227          * We cannot grow the buffer if we're not reading
 228          * into the prs_struct, or if we don't own the memory.
 229          */
 230
 231         if(UNMARSHALLING(ps) || !ps->is_dynamic) {
 232                 DEBUG(0,("prs_grow: Buffer overflow - unable to expand buffer by %u bytes.\n",
 233                                 (unsigned int)extra_space));
 234                 return False;
 235         }
 236
 237         /*
 238          * Decide how much extra space we really need.
 239          */
 240
 241         extra_space -= (ps->buffer_size - ps->data_offset);
 242         if(ps->buffer_size == 0) {
 243                 /*
 244                  * Ensure we have at least a PDU's length, or extra_space, whichever
 245                  * is greater.
 246                  */
 247
 248                 new_size = MAX(MAX_PDU_FRAG_LEN,extra_space);
 249
 250                 if((new_data = malloc(new_size)) == NULL) {
 251                         DEBUG(0,("prs_grow: Malloc failure for size %u.\n", (unsigned int)new_size));
 252                         return False;
 253                 }
 254                 memset(new_data, '\0', (size_t)new_size );
 255         } else {
 256                 /*
 257                  * If the current buffer size is bigger than the space needed, just
 258                  * double it, else add extra_space.
 259                  */
 260                 new_size = MAX(ps->buffer_size*2, ps->buffer_size + extra_space);
 261
 262                 if ((new_data = Realloc(ps->data_p, new_size)) == NULL) {
 263                         DEBUG(0,("prs_grow: Realloc failure for size %u.\n",
 264                                 (unsigned int)new_size));
 265                         return False;
 266                 }
 267
 268                 memset(&new_data[ps->buffer_size], '\0', (size_t)(new_size - ps->buffer_size));
 269         }
 270         ps->buffer_size = new_size;
 271         ps->data_p = new_data;
 272
 273         return True;
 274 }
 275
 276 /*******************************************************************
 277  Attempt to force a data buffer to grow by len bytes.
 278  This is only used when appending more data onto a prs_struct
 279  when reading an rpc reply, before unmarshalling it.
 280  ********************************************************************/
 281
 282 BOOL prs_force_grow(prs_struct *ps, uint32 extra_space)
 283 {
 284         uint32 new_size = ps->buffer_size + extra_space;
 285         char *new_data;
 286
 287         if(!UNMARSHALLING(ps) || !ps->is_dynamic) {
 288                 DEBUG(0,("prs_force_grow: Buffer overflow - unable to expand buffer by %u bytes.\n",
 289                                 (unsigned int)extra_space));
 290                 return False;
 291         }
 292
 293         if((new_data = Realloc(ps->data_p, new_size)) == NULL) {
 294                 DEBUG(0,("prs_force_grow: Realloc failure for size %u.\n",
 295                         (unsigned int)new_size));
 296                 return False;
 297         }
 298
 299         memset(&new_data[ps->buffer_size], '\0', (size_t)(new_size - ps->buffer_size));
 300
 301         ps->buffer_size = new_size;
 302         ps->data_p = new_data;
 303
 304         return True;
 305 }
 306
 307 /*******************************************************************
 308  Get the data pointer (external interface).
 309  ********************************************************************/
 310
 311 char *prs_data_p(prs_struct *ps)
 312 {
 313         return ps->data_p;
 314 }
 315
 316 /*******************************************************************
 317  Get the current data size (external interface).
 318  ********************************************************************/
 319
 320 uint32 prs_data_size(prs_struct *ps)
 321 {
 322         return ps->buffer_size;
 323 }
 324
 325 /*******************************************************************
 326  Fetch the current offset (external interface).
 327  ********************************************************************/
 328
 329 uint32 prs_offset(prs_struct *ps)
 330 {
 331         return ps->data_offset;
 332 }
 333
 334 /*******************************************************************
 335  Set the current offset (external interface).
 336  ********************************************************************/
 337
 338 BOOL prs_set_offset(prs_struct *ps, uint32 offset)
 339 {
 340         if(offset <= ps->data_offset) {
 341                 ps->data_offset = offset;
 342                 return True;
 343         }
 344
 345         if(!prs_grow(ps, offset - ps->data_offset))
 346                 return False;
 347
 348         ps->data_offset = offset;
 349         return True;
 350 }
 351
 352 /*******************************************************************
 353  Append the data from one parse_struct into another.
 354  ********************************************************************/
 355
 356 BOOL prs_append_prs_data(prs_struct *dst, prs_struct *src)
 357 {
 358         if(!prs_grow(dst, prs_offset(src)))
 359                 return False;
 360
 361         memcpy(&dst->data_p[dst->data_offset], prs_data_p(src), (size_t)prs_offset(src));
 362         dst->data_offset += prs_offset(src);
 363
 364         return True;
 365 }
 366
 367 /*******************************************************************
 368  Append some data from one parse_struct into another.
 369  ********************************************************************/
 370
 371 BOOL prs_append_some_prs_data(prs_struct *dst, prs_struct *src, int32 start, uint32 len)
 372 {
 373         if (len == 0)
 374                 return True;
 375
 376         if(!prs_grow(dst, len))
 377                 return False;
 378
 379         memcpy(&dst->data_p[dst->data_offset], prs_data_p(src)+start, (size_t)len);
 380         dst->data_offset += len;
 381
 382         return True;
 383 }
 384
 385 /*******************************************************************
 386  Append the data from a buffer into a parse_struct.
 387  ********************************************************************/
 388
 389 BOOL prs_append_data(prs_struct *dst, char *src, uint32 len)
 390 {
 391         if(!prs_grow(dst, len))
 392                 return False;
 393
 394         memcpy(&dst->data_p[dst->data_offset], src, (size_t)len);
 395         dst->data_offset += len;
 396
 397         return True;
 398 }
 399
 400 /*******************************************************************
 401  Set the data as X-endian (external interface).
 402  ********************************************************************/
 403
 404 void prs_set_endian_data(prs_struct *ps, BOOL endian)
 405 {
 406         ps->bigendian_data = endian;
 407 }
 408
 409 /*******************************************************************
 410  Align a the data_len to a multiple of align bytes - filling with
 411  zeros.
 412  ********************************************************************/
 413
 414 BOOL prs_align(prs_struct *ps)
 415 {
 416         uint32 mod = ps->data_offset & (ps->align-1);
 417
 418         if (ps->align != 0 && mod != 0) {
 419                 uint32 extra_space = (ps->align - mod);
 420                 if(!prs_grow(ps, extra_space))
 421                         return False;
 422                 memset(&ps->data_p[ps->data_offset], '\0', (size_t)extra_space);
 423                 ps->data_offset += extra_space;
 424         }
 425
 426         return True;
 427 }
 428
 429 BOOL prs_align_uint16(prs_struct *ps)
 430 {
 431         BOOL ret;
 432         uint8 old_align = ps->align;
 433
 434         ps->align = 2;
 435         ret = prs_align(ps);
 436         ps->align = old_align;
 437         return ret;
 438 }
 439
 440 /*******************************************************************
 441  Align only if required (for the unistr2 string mainly)
 442  ********************************************************************/
 443
 444 BOOL prs_align_needed(prs_struct *ps, uint32 needed)
 445 {
 446         if (needed==0)
 447                 return True;
 448         else
 449                 return prs_align(ps);
 450 }
 451
 452 /*******************************************************************
 453  Ensure we can read/write to a given offset.
 454  ********************************************************************/
 455
 456 char *prs_mem_get(prs_struct *ps, uint32 extra_size)
 457 {
 458         if(UNMARSHALLING(ps)) {
 459                 /*
 460                  * If reading, ensure that we can read the requested size item.
 461                  */
 462                 if (ps->data_offset + extra_size > ps->buffer_size) {
 463                         DEBUG(0,("prs_mem_get: reading data of size %u would overrun buffer.\n",
 464                                         (unsigned int)extra_size ));
 465                         return NULL;
 466                 }
 467         } else {
 468                 /*
 469                  * Writing - grow the buffer if needed.
 470                  */
 471                 if(!prs_grow(ps, extra_size))
 472                         return NULL;
 473         }
 474         return &ps->data_p[ps->data_offset];
 475 }
 476
 477 /*******************************************************************
 478  Change the struct type.
 479  ********************************************************************/
 480
 481 void prs_switch_type(prs_struct *ps, BOOL io)
 482 {
 483         if ((ps->io ^ io) == True)
 484                 ps->io=io;
 485 }
 486
 487 /*******************************************************************
 488  Force a prs_struct to be dynamic even when it's size is 0.
 489  ********************************************************************/
 490
 491 void prs_force_dynamic(prs_struct *ps)
 492 {
 493         ps->is_dynamic=True;
 494 }
 495
 496 /*******************************************************************
 497  Stream a uint8.
 498  ********************************************************************/
 499
 500 BOOL prs_uint8(char *name, prs_struct *ps, int depth, uint8 *data8)
 501 {
 502         char *q = prs_mem_get(ps, 1);
 503         if (q == NULL)
 504                 return False;
 505
 506     if (UNMARSHALLING(ps))
 507                 *data8 = CVAL(q,0);
 508         else
 509                 SCVAL(q,0,*data8);
 510
 511     DEBUG(5,("%s%04x %s: %02x\n", tab_depth(depth), ps->data_offset, name, *data8));
 512
 513         ps->data_offset += 1;
 514
 515         return True;
 516 }
 517
 518 /*******************************************************************
 519  Stream a uint16.
 520  ********************************************************************/
 521
 522 BOOL prs_uint16(char *name, prs_struct *ps, int depth, uint16 *data16)
 523 {
 524         char *q = prs_mem_get(ps, sizeof(uint16));
 525         if (q == NULL)
 526                 return False;
 527
 528     if (UNMARSHALLING(ps)) {
 529                 if (ps->bigendian_data)
 530                         *data16 = RSVAL(q,0);
 531                 else
 532                         *data16 = SVAL(q,0);
 533     } else {
 534                 if (ps->bigendian_data)
 535                         RSSVAL(q,0,*data16);
 536                 else
 537                         SSVAL(q,0,*data16);
 538         }
 539
 540         DEBUG(5,("%s%04x %s: %04x\n", tab_depth(depth), ps->data_offset, name, *data16));
 541
 542         ps->data_offset += sizeof(uint16);
 543
 544         return True;
 545 }
 546
 547 /*******************************************************************
 548  Stream a uint32.
 549  ********************************************************************/
 550
 551 BOOL prs_uint32(char *name, prs_struct *ps, int depth, uint32 *data32)
 552 {
 553         char *q = prs_mem_get(ps, sizeof(uint32));
 554         if (q == NULL)
 555                 return False;
 556
 557         if (UNMARSHALLING(ps)) {
 558                 if (ps->bigendian_data)
 559                         *data32 = RIVAL(q,0);
 560                 else
 561                         *data32 = IVAL(q,0);
 562         } else {
 563                 if (ps->bigendian_data)
 564                         RSIVAL(q,0,*data32);
 565                 else
 566                         SIVAL(q,0,*data32);
 567         }
 568
 569         DEBUG(5,("%s%04x %s: %08x\n", tab_depth(depth), ps->data_offset, name, *data32));
 570
 571         ps->data_offset += sizeof(uint32);
 572
 573         return True;
 574 }
 575
 576 /*******************************************************************
 577  Stream a NTSTATUS
 578  ********************************************************************/
 579
 580 BOOL prs_ntstatus(char *name, prs_struct *ps, int depth, NTSTATUS *status)
 581 {
 582         char *q = prs_mem_get(ps, sizeof(uint32));
 583         if (q == NULL)
 584                 return False;
 585
 586         if (UNMARSHALLING(ps)) {
 587                 if (ps->bigendian_data)
 588                         *status = NT_STATUS(RIVAL(q,0));
 589                 else
 590                         *status = NT_STATUS(IVAL(q,0));
 591         } else {
 592                 if (ps->bigendian_data)
 593                         RSIVAL(q,0,NT_STATUS_V(*status));
 594                 else
 595                         SIVAL(q,0,NT_STATUS_V(*status));
 596         }
 597
 598         DEBUG(5,("%s%04x %s: %s\n", tab_depth(depth), ps->data_offset, name,
 599                  get_nt_error_msg(*status)));
 600
 601         ps->data_offset += sizeof(uint32);
 602
 603         return True;
 604 }
 605
 606 /*******************************************************************
 607  Stream a WERROR
 608  ********************************************************************/
 609
 610 BOOL prs_werror(char *name, prs_struct *ps, int depth, WERROR *status)
 611 {
 612         char *q = prs_mem_get(ps, sizeof(uint32));
 613         if (q == NULL)
 614                 return False;
 615
 616         if (UNMARSHALLING(ps)) {
 617                 if (ps->bigendian_data)
 618                         *status = W_ERROR(RIVAL(q,0));
 619                 else
 620                         *status = W_ERROR(IVAL(q,0));
 621         } else {
 622                 if (ps->bigendian_data)
 623                         RSIVAL(q,0,W_ERROR_V(*status));
 624                 else
 625                         SIVAL(q,0,W_ERROR_V(*status));
 626         }
 627
 628         DEBUG(5,("%s%04x %s: %s\n", tab_depth(depth), ps->data_offset, name,
 629                  dos_errstr(*status)));
 630
 631         ps->data_offset += sizeof(uint32);
 632
 633         return True;
 634 }
 635
 636
 637 /******************************************************************
 638  Stream an array of uint8s. Length is number of uint8s.
 639  ********************************************************************/
 640
 641 BOOL prs_uint8s(BOOL charmode, char *name, prs_struct *ps, int depth, uint8 *data8s, int len)
 642 {
 643         int i;
 644         char *q = prs_mem_get(ps, len);
 645         if (q == NULL)
 646                 return False;
 647
 648         if (UNMARSHALLING(ps)) {
 649                 for (i = 0; i < len; i++)
 650                         data8s[i] = CVAL(q,i);
 651         } else {
 652                 for (i = 0; i < len; i++)
 653                         SCVAL(q, i, data8s[i]);
 654         }
 655
 656     DEBUG(5,("%s%04x %s: ", tab_depth(depth), ps->data_offset ,name));
 657     if (charmode)
 658                 print_asc(5, (unsigned char*)data8s, len);
 659         else {
 660         for (i = 0; i < len; i++)
 661                         DEBUG(5,("%02x ", data8s[i]));
 662         }
 663     DEBUG(5,("\n"));
 664
 665         ps->data_offset += len;
 666
 667         return True;
 668 }
 669
 670 /******************************************************************
 671  Stream an array of uint16s. Length is number of uint16s.
 672  ********************************************************************/
 673
 674 BOOL prs_uint16s(BOOL charmode, char *name, prs_struct *ps, int depth, uint16 *data16s, int len)
 675 {
 676         int i;
 677         char *q = prs_mem_get(ps, len * sizeof(uint16));
 678         if (q == NULL)
 679                 return False;
 680
 681         if (UNMARSHALLING(ps)) {
 682                 if (ps->bigendian_data) {
 683                         for (i = 0; i < len; i++)
 684                                 data16s[i] = RSVAL(q, 2*i);
 685                 } else {
 686                         for (i = 0; i < len; i++)
 687                                 data16s[i] = SVAL(q, 2*i);
 688                 }
 689         } else {
 690                 if (ps->bigendian_data) {
 691                         for (i = 0; i < len; i++)
 692                                 RSSVAL(q, 2*i, data16s[i]);
 693                 } else {
 694                         for (i = 0; i < len; i++)
 695                                 SSVAL(q, 2*i, data16s[i]);
 696                 }
 697         }
 698
 699         DEBUG(5,("%s%04x %s: ", tab_depth(depth), ps->data_offset, name));
 700         if (charmode)
 701                 print_asc(5, (unsigned char*)data16s, 2*len);
 702         else {
 703                 for (i = 0; i < len; i++)
 704                         DEBUG(5,("%04x ", data16s[i]));
 705         }
 706     DEBUG(5,("\n"));
 707
 708         ps->data_offset += (len * sizeof(uint16));
 709
 710         return True;
 711 }
 712
 713 /******************************************************************
 714  Start using a function for streaming unicode chars. If unmarshalling,
 715  output must be little-endian, if marshalling, input must be little-endian.
 716  ********************************************************************/
 717
 718 static void dbg_rw_punival(BOOL charmode, char *name, int depth, prs_struct *ps,
 719                                                         char *in_buf, char *out_buf, int len)
 720 {
 721         int i;
 722
 723         if (UNMARSHALLING(ps)) {
 724                 if (ps->bigendian_data) {
 725                         for (i = 0; i < len; i++)
 726                                 SSVAL(out_buf,2*i,RSVAL(in_buf, 2*i));
 727                 } else {
 728                         for (i = 0; i < len; i++)
 729                                 SSVAL(out_buf, 2*i, SVAL(in_buf, 2*i));
 730                 }
 731         } else {
 732                 if (ps->bigendian_data) {
 733                         for (i = 0; i < len; i++)
 734                                 RSSVAL(in_buf, 2*i, SVAL(out_buf,2*i));
 735                 } else {
 736                         for (i = 0; i < len; i++)
 737                                 SSVAL(in_buf, 2*i, SVAL(out_buf,2*i));
 738                 }
 739         }
 740
 741         DEBUG(5,("%s%04x %s: ", tab_depth(depth), ps->data_offset, name));
 742         if (charmode)
 743                 print_asc(5, (unsigned char*)out_buf, 2*len);
 744         else {
 745                 for (i = 0; i < len; i++)
 746                         DEBUG(5,("%04x ", out_buf[i]));
 747         }
 748     DEBUG(5,("\n"));
 749 }
 750
 751 /******************************************************************
 752  Stream a unistr. Always little endian.
 753  ********************************************************************/
 754
 755 BOOL prs_uint16uni(BOOL charmode, char *name, prs_struct *ps, int depth, uint16 *data16s, int len)
 756 {
 757         char *q = prs_mem_get(ps, len * sizeof(uint16));
 758         if (q == NULL)
 759                 return False;
 760
 761         dbg_rw_punival(charmode, name, depth, ps, q, (char *)data16s, len);
 762         ps->data_offset += (len * sizeof(uint16));
 763
 764         return True;
 765 }
 766
 767 /******************************************************************
 768  Stream an array of uint32s. Length is number of uint32s.
 769  ********************************************************************/
 770
 771 BOOL prs_uint32s(BOOL charmode, char *name, prs_struct *ps, int depth, uint32 *data32s, int len)
 772 {
 773         int i;
 774         char *q = prs_mem_get(ps, len * sizeof(uint32));
 775         if (q == NULL)
 776                 return False;
 777
 778         if (UNMARSHALLING(ps)) {
 779                 if (ps->bigendian_data) {
 780                         for (i = 0; i < len; i++)
 781                                 data32s[i] = RIVAL(q, 4*i);
 782                 } else {
 783                         for (i = 0; i < len; i++)
 784                                 data32s[i] = IVAL(q, 4*i);
 785                 }
 786         } else {
 787                 if (ps->bigendian_data) {
 788                         for (i = 0; i < len; i++)
 789                                 RSIVAL(q, 4*i, data32s[i]);
 790                 } else {
 791                         for (i = 0; i < len; i++)
 792                                 SIVAL(q, 4*i, data32s[i]);
 793                 }
 794         }
 795
 796         DEBUG(5,("%s%04x %s: ", tab_depth(depth), ps->data_offset, name));
 797         if (charmode)
 798                 print_asc(5, (unsigned char*)data32s, 4*len);
 799         else {
 800                 for (i = 0; i < len; i++)
 801                         DEBUG(5,("%08x ", data32s[i]));
 802         }
 803     DEBUG(5,("\n"));
 804
 805         ps->data_offset += (len * sizeof(uint32));
 806
 807         return True;
 808 }
 809
 810 /******************************************************************
 811  Stream an array of unicode string, length/buffer specified separately,
 812  in uint16 chars. The unicode string is already in little-endian format.
 813  ********************************************************************/
 814
 815 BOOL prs_buffer5(BOOL charmode, char *name, prs_struct *ps, int depth, BUFFER5 *str)
 816 {
 817         char *p;
 818         char *q = prs_mem_get(ps, str->buf_len * sizeof(uint16));
 819         if (q == NULL)
 820                 return False;
 821
 822         if (UNMARSHALLING(ps)) {
 823                 str->buffer = (uint16 *)prs_alloc_mem(ps,str->buf_len * sizeof(uint16));
 824                 if (str->buffer == NULL)
 825                         return False;
 826         }
 827
 828         /* If the string is empty, we don't have anything to stream */
 829         if (str->buf_len==0)
 830                 return True;
 831
 832         p = (char *)str->buffer;
 833
 834         dbg_rw_punival(charmode, name, depth, ps, q, p, str->buf_len);
 835
 836         ps->data_offset += (str->buf_len * sizeof(uint16));
 837
 838         return True;
 839 }
 840
 841 /******************************************************************
 842  Stream a "not" unicode string, length/buffer specified separately,
 843  in byte chars. String is in little-endian format.
 844  ********************************************************************/
 845
 846 BOOL prs_buffer2(BOOL charmode, char *name, prs_struct *ps, int depth, BUFFER2 *str)
 847 {
 848         char *p;
 849         char *q = prs_mem_get(ps, str->buf_len);
 850         if (q == NULL)
 851                 return False;
 852
 853         if (UNMARSHALLING(ps)) {
 854                 str->buffer = (uint16 *)prs_alloc_mem(ps,str->buf_len);
 855                 if (str->buffer == NULL)
 856                         return False;
 857         }
 858
 859         p = (char *)str->buffer;
 860
 861         dbg_rw_punival(charmode, name, depth, ps, q, p, str->buf_len/2);
 862         ps->data_offset += str->buf_len;
 863
 864         return True;
 865 }
 866
 867 /******************************************************************
 868  Stream a string, length/buffer specified separately,
 869  in uint8 chars.
 870  ********************************************************************/
 871
 872 BOOL prs_string2(BOOL charmode, char *name, prs_struct *ps, int depth, STRING2 *str)
 873 {
 874         int i;
 875         char *q = prs_mem_get(ps, str->str_max_len);
 876         if (q == NULL)
 877                 return False;
 878
 879         if (UNMARSHALLING(ps)) {
 880                 str->buffer = (unsigned char *)prs_alloc_mem(ps,str->str_max_len);
 881                 if (str->buffer == NULL)
 882                         return False;
 883         }
 884
 885         if (UNMARSHALLING(ps)) {
 886                 for (i = 0; i < str->str_str_len; i++)
 887                         str->buffer[i] = CVAL(q,i);
 888         } else {
 889                 for (i = 0; i < str->str_str_len; i++)
 890                         SCVAL(q, i, str->buffer[i]);
 891         }
 892
 893     DEBUG(5,("%s%04x %s: ", tab_depth(depth), ps->data_offset, name));
 894     if (charmode)
 895                 print_asc(5, (unsigned char*)str->buffer, str->str_str_len);
 896         else {
 897         for (i = 0; i < str->str_str_len; i++)
 898                         DEBUG(5,("%02x ", str->buffer[i]));
 899         }
 900     DEBUG(5,("\n"));
 901
 902         ps->data_offset += str->str_str_len;
 903
 904         return True;
 905 }
 906
 907 /******************************************************************
 908  Stream a unicode string, length/buffer specified separately,
 909  in uint16 chars. The unicode string is already in little-endian format.
 910  ********************************************************************/
 911
 912 BOOL prs_unistr2(BOOL charmode, char *name, prs_struct *ps, int depth, UNISTR2 *str)
 913 {
 914         char *p;
 915         char *q = prs_mem_get(ps, str->uni_str_len * sizeof(uint16));
 916         if (q == NULL)
 917                 return False;
 918
 919         /* If the string is empty, we don't have anything to stream */
 920         if (str->uni_str_len==0)
 921                 return True;
 922
 923         if (UNMARSHALLING(ps)) {
 924                 str->buffer = (uint16 *)prs_alloc_mem(ps,str->uni_max_len * sizeof(uint16));
 925                 if (str->buffer == NULL)
 926                         return False;
 927         }
 928
 929         p = (char *)str->buffer;
 930
 931         dbg_rw_punival(charmode, name, depth, ps, q, p, str->uni_str_len);
 932
 933         ps->data_offset += (str->uni_str_len * sizeof(uint16));
 934
 935         return True;
 936 }
 937
 938 /******************************************************************
 939  Stream a unicode string, length/buffer specified separately,
 940  in uint16 chars. The unicode string is already in little-endian format.
 941  ********************************************************************/
 942
 943 BOOL prs_unistr3(BOOL charmode, char *name, UNISTR3 *str, prs_struct *ps, int depth)
 944 {
 945         char *p;
 946         char *q = prs_mem_get(ps, str->uni_str_len * sizeof(uint16));
 947         if (q == NULL)
 948                 return False;
 949
 950         if (UNMARSHALLING(ps)) {
 951                 str->str.buffer = (uint16 *)prs_alloc_mem(ps,str->uni_str_len * sizeof(uint16));
 952                 if (str->str.buffer == NULL)
 953                         return False;
 954         }
 955
 956         p = (char *)str->str.buffer;
 957
 958         dbg_rw_punival(charmode, name, depth, ps, q, p, str->uni_str_len);
 959         ps->data_offset += (str->uni_str_len * sizeof(uint16));
 960
 961         return True;
 962 }
 963
 964 /*******************************************************************
 965  Stream a unicode  null-terminated string. As the string is already
 966  in little-endian format then do it as a stream of bytes.
 967  ********************************************************************/
 968
 969 BOOL prs_unistr(char *name, prs_struct *ps, int depth, UNISTR *str)
 970 {
 971         int len = 0;
 972         unsigned char *p = (unsigned char *)str->buffer;
 973         uint8 *start;
 974         char *q;
 975         uint32 max_len;
 976         uint16* ptr;
 977
 978         if (MARSHALLING(ps)) {
 979
 980                 for(len = 0; str->buffer[len] != 0; len++)
 981                         ;
 982
 983                 q = prs_mem_get(ps, (len+1)*2);
 984                 if (q == NULL)
 985                         return False;
 986
 987                 start = (uint8*)q;
 988
 989                 for(len = 0; str->buffer[len] != 0; len++)
 990                 {
 991                         if(ps->bigendian_data)
 992                         {
 993                                 /* swap bytes - p is little endian, q is big endian. */
 994                                 q[0] = (char)p[1];
 995                                 q[1] = (char)p[0];
 996                                 p += 2;
 997                                 q += 2;
 998                         }
 999                         else
1000                         {
1001                                 q[0] = (char)p[0];
1002                                 q[1] = (char)p[1];
1003                                 p += 2;
1004                                 q += 2;
1005                         }
1006                 }
1007
1008                 /*
1009                  * even if the string is 'empty' (only an \0 char)
1010                  * at this point the leading \0 hasn't been parsed.
1011                  * so parse it now
1012                  */
1013
1014                 q[0] = 0;
1015                 q[1] = 0;
1016                 q += 2;
1017
1018                 len++;
1019
1020                 dump_data(5+depth, (char *)start, len * 2);
1021         }
1022         else { /* unmarshalling */
1023
1024                 uint32 alloc_len = 0;
1025                 q = prs_data_p(ps) + prs_offset(ps);
1026
1027                 /*
1028                  * Work out how much space we need and talloc it.
1029                  */
1030                 max_len = (ps->buffer_size - ps->data_offset)/sizeof(uint16);
1031
1032                 /* the test of the value of *ptr helps to catch the circumstance
1033                    where we have an emtpty (non-existent) string in the buffer */
1034                 for ( ptr = (uint16 *)q; *ptr && (alloc_len <= max_len); alloc_len++)
1035                         /* do nothing */
1036                         ;
1037
1038                 /* should we allocate anything at all? */
1039                 str->buffer = (uint16 *)prs_alloc_mem(ps,alloc_len * sizeof(uint16));
1040                 if ((str->buffer == NULL) && (alloc_len > 0))
1041                         return False;
1042
1043                 p = (unsigned char *)str->buffer;
1044
1045                 len = 0;
1046                 /* the (len < alloc_len) test is to prevent us from overwriting
1047                    memory that is not ours...if we get that far, we have a non-null
1048                    terminated string in the buffer and have messed up somewhere */
1049                 while ((len < alloc_len) && (*(uint16 *)q != 0))
1050                 {
1051                         if(ps->bigendian_data)
1052                         {
1053                                 /* swap bytes - q is big endian, p is little endian. */
1054                                 p[0] = (unsigned char)q[1];
1055                                 p[1] = (unsigned char)q[0];
1056                                 p += 2;
1057                                 q += 2;
1058                         } else {
1059
1060                                 p[0] = (unsigned char)q[0];
1061                                 p[1] = (unsigned char)q[1];
1062                                 p += 2;
1063                                 q += 2;
1064                         }
1065
1066                         len++;
1067                 }
1068                 if (len < alloc_len)
1069                 {
1070                         /* NULL terminate the UNISTR */
1071                         str->buffer[len++] = '\0';
1072                 }
1073         }
1074
1075         /* set the offset in the prs_struct; 'len' points to the
1076            terminiating NULL in the UNISTR so we need to go one more
1077            uint16 */
1078         ps->data_offset += (len)*2;
1079
1080         return True;
1081 }
1082
1083
1084 /*******************************************************************
1085  Stream a null-terminated string.  len is strlen, and therefore does
1086  not include the null-termination character.
1087  ********************************************************************/
1088
1089 BOOL prs_string(char *name, prs_struct *ps, int depth, char *str, int len, int max_buf_size)
1090 {
1091         char *q;
1092         int i;
1093
1094         len = MIN(len, (max_buf_size-1));
1095
1096         q = prs_mem_get(ps, len+1);
1097         if (q == NULL)
1098                 return False;
1099
1100         for(i = 0; i < len; i++) {
1101                 if (UNMARSHALLING(ps))
1102                         str[i] = q[i];
1103                 else
1104                         q[i] = str[i];
1105         }
1106
1107         /* The terminating null. */
1108         str[i] = '\0';
1109
1110         if (MARSHALLING(ps)) {
1111                 q[i] = '\0';
1112         }
1113
1114         ps->data_offset += len+1;
1115
1116         dump_data(5+depth, q, len);
1117
1118         return True;
1119 }
1120
1121 /*******************************************************************
1122  prs_uint16 wrapper. Call this and it sets up a pointer to where the
1123  uint16 should be stored, or gets the size if reading.
1124  ********************************************************************/
1125
1126 BOOL prs_uint16_pre(char *name, prs_struct *ps, int depth, uint16 *data16, uint32 *offset)
1127 {
1128         *offset = ps->data_offset;
1129         if (UNMARSHALLING(ps)) {
1130                 /* reading. */
1131                 return prs_uint16(name, ps, depth, data16);
1132         } else {
1133                 char *q = prs_mem_get(ps, sizeof(uint16));
1134                 if(q ==NULL)
1135                         return False;
1136                 ps->data_offset += sizeof(uint16);
1137         }
1138         return True;
1139 }
1140
1141 /*******************************************************************
1142  prs_uint16 wrapper.  call this and it retrospectively stores the size.
1143  does nothing on reading, as that is already handled by ...._pre()
1144  ********************************************************************/
1145
1146 BOOL prs_uint16_post(char *name, prs_struct *ps, int depth, uint16 *data16,
1147                                 uint32 ptr_uint16, uint32 start_offset)
1148 {
1149         if (MARSHALLING(ps)) {
1150                 /*
1151                  * Writing - temporarily move the offset pointer.
1152                  */
1153                 uint16 data_size = ps->data_offset - start_offset;
1154                 uint32 old_offset = ps->data_offset;
1155
1156                 ps->data_offset = ptr_uint16;
1157                 if(!prs_uint16(name, ps, depth, &data_size)) {
1158                         ps->data_offset = old_offset;
1159                         return False;
1160                 }
1161                 ps->data_offset = old_offset;
1162         } else {
1163                 ps->data_offset = start_offset + (uint32)(*data16);
1164         }
1165         return True;
1166 }
1167
1168 /*******************************************************************
1169  prs_uint32 wrapper. Call this and it sets up a pointer to where the
1170  uint32 should be stored, or gets the size if reading.
1171  ********************************************************************/
1172
1173 BOOL prs_uint32_pre(char *name, prs_struct *ps, int depth, uint32 *data32, uint32 *offset)
1174 {
1175         *offset = ps->data_offset;
1176         if (UNMARSHALLING(ps) && (data32 != NULL)) {
1177                 /* reading. */
1178                 return prs_uint32(name, ps, depth, data32);
1179         } else {
1180                 ps->data_offset += sizeof(uint32);
1181         }
1182         return True;
1183 }
1184
1185 /*******************************************************************
1186  prs_uint32 wrapper.  call this and it retrospectively stores the size.
1187  does nothing on reading, as that is already handled by ...._pre()
1188  ********************************************************************/
1189
1190 BOOL prs_uint32_post(char *name, prs_struct *ps, int depth, uint32 *data32,
1191                                 uint32 ptr_uint32, uint32 data_size)
1192 {
1193         if (MARSHALLING(ps)) {
1194                 /*
1195                  * Writing - temporarily move the offset pointer.
1196                  */
1197                 uint32 old_offset = ps->data_offset;
1198                 ps->data_offset = ptr_uint32;
1199                 if(!prs_uint32(name, ps, depth, &data_size)) {
1200                         ps->data_offset = old_offset;
1201                         return False;
1202                 }
1203                 ps->data_offset = old_offset;
1204         }
1205         return True;
1206 }
1207
1208 /* useful function to store a structure in rpc wire format */
1209 int tdb_prs_store(TDB_CONTEXT *tdb, char *keystr, prs_struct *ps)
1210 {
1211     TDB_DATA kbuf, dbuf;
1212     kbuf.dptr = keystr;
1213     kbuf.dsize = strlen(keystr)+1;
1214     dbuf.dptr = prs_data_p(ps);
1215     dbuf.dsize = prs_offset(ps);
1216     return tdb_store(tdb, kbuf, dbuf, TDB_REPLACE);
1217 }
1218
1219 /* useful function to fetch a structure into rpc wire format */
1220 int tdb_prs_fetch(TDB_CONTEXT *tdb, char *keystr, prs_struct *ps, TALLOC_CTX *mem_ctx)
1221 {
1222     TDB_DATA kbuf, dbuf;
1223     kbuf.dptr = keystr;
1224     kbuf.dsize = strlen(keystr)+1;
1225
1226     dbuf = tdb_fetch(tdb, kbuf);
1227     if (!dbuf.dptr) return -1;
1228
1229     ZERO_STRUCTP(ps);
1230     prs_init(ps, 0, mem_ctx, UNMARSHALL);
1231     prs_give_memory(ps, dbuf.dptr, dbuf.dsize, True);
1232
1233     return 0;
1234 }
1235
1236 /*******************************************************************
1237  hash a stream.
1238  ********************************************************************/
1239 BOOL prs_hash1(prs_struct *ps, uint32 offset, uint8 sess_key[16])
1240 {
1241         char *q;
1242
1243         q = prs_data_p(ps);
1244         q = &q[offset];
1245
1246 #ifdef DEBUG_PASSWORD
1247         DEBUG(100, ("prs_hash1\n"));
1248         dump_data(100, sess_key, 16);
1249         dump_data(100, q, 68);
1250 #endif
1251         SamOEMhash((uchar *) q, sess_key, 68);
1252
1253 #ifdef DEBUG_PASSWORD
1254         dump_data(100, q, 68);
1255 #endif
1256
1257         return True;
1258 }