librpc/ndr/ndr_string.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    routines for marshalling/unmarshalling string types
   5
   6    Copyright (C) Andrew Tridgell 2003
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include "includes.h"
  23 #include "librpc/ndr/libndr.h"
  24
  25 /**
  26   pull a general string from the wire
  27 */
  28 _PUBLIC_ enum ndr_err_code ndr_pull_string(struct ndr_pull *ndr, int ndr_flags, const char **s)
  29 {
  30         char *as=NULL;
  31         uint32_t len1, ofs, len2;
  32         uint16_t len3;
  33         size_t conv_src_len = 0, converted_size;
  34         int do_convert = 1, chset = CH_UTF16;
  35         unsigned byte_mul = 2;
  36         unsigned flags = ndr->flags;
  37         unsigned c_len_term = 0;
  38
  39         if (!(ndr_flags & NDR_SCALARS)) {
  40                 return NDR_ERR_SUCCESS;
  41         }
  42
  43         if (NDR_BE(ndr)) {
  44                 chset = CH_UTF16BE;
  45         }
  46
  47         if (flags & LIBNDR_FLAG_STR_ASCII) {
  48                 chset = CH_DOS;
  49                 byte_mul = 1;
  50                 flags &= ~LIBNDR_FLAG_STR_ASCII;
  51         }
  52
  53         if (flags & LIBNDR_FLAG_STR_UTF8) {
  54                 chset = CH_UTF8;
  55                 byte_mul = 1;
  56                 flags &= ~LIBNDR_FLAG_STR_UTF8;
  57         }
  58
  59         if (flags & LIBNDR_FLAG_STR_RAW8) {
  60                 do_convert = 0;
  61                 byte_mul = 1;
  62                 flags &= ~LIBNDR_FLAG_STR_RAW8;
  63         }
  64
  65         flags &= ~LIBNDR_FLAG_STR_CONFORMANT;
  66         if (flags & LIBNDR_FLAG_STR_CHARLEN) {
  67                 c_len_term = 1;
  68                 flags &= ~LIBNDR_FLAG_STR_CHARLEN;
  69         }
  70
  71         switch (flags & LIBNDR_STRING_FLAGS) {
  72         case LIBNDR_FLAG_STR_LEN4|LIBNDR_FLAG_STR_SIZE4:
  73         case LIBNDR_FLAG_STR_LEN4|LIBNDR_FLAG_STR_SIZE4|LIBNDR_FLAG_STR_NOTERM:
  74                 NDR_CHECK(ndr_pull_uint32(ndr, NDR_SCALARS, &len1));
  75                 NDR_CHECK(ndr_pull_uint32(ndr, NDR_SCALARS, &ofs));
  76                 if (ofs != 0) {
  77                         return ndr_pull_error(ndr, NDR_ERR_STRING, "non-zero array offset with string flags 0x%x\n",
  78                                               ndr->flags & LIBNDR_STRING_FLAGS);
  79                 }
  80                 NDR_CHECK(ndr_pull_uint32(ndr, NDR_SCALARS, &len2));
  81                 if (len2 > len1) {
  82                         return ndr_pull_error(ndr, NDR_ERR_STRING,
  83                                               "Bad string lengths len1=%u ofs=%u len2=%u\n",
  84                                               len1, ofs, len2);
  85                 } else if (len1 != len2) {
  86                         DEBUG(6,("len1[%u] != len2[%u] '%s'\n", len1, len2, as));
  87                 }
  88                 conv_src_len = len2 + c_len_term;
  89                 break;
  90
  91         case LIBNDR_FLAG_STR_SIZE4:
  92         case LIBNDR_FLAG_STR_SIZE4|LIBNDR_FLAG_STR_NOTERM:
  93                 NDR_CHECK(ndr_pull_uint32(ndr, NDR_SCALARS, &len1));
  94                 conv_src_len = len1 + c_len_term;
  95                 break;
  96
  97         case LIBNDR_FLAG_STR_LEN4:
  98         case LIBNDR_FLAG_STR_LEN4|LIBNDR_FLAG_STR_NOTERM:
  99                 NDR_CHECK(ndr_pull_uint32(ndr, NDR_SCALARS, &ofs));
 100                 if (ofs != 0) {
 101                         return ndr_pull_error(ndr, NDR_ERR_STRING, "non-zero array offset with string flags 0x%x\n",
 102                                               ndr->flags & LIBNDR_STRING_FLAGS);
 103                 }
 104                 NDR_CHECK(ndr_pull_uint32(ndr, NDR_SCALARS, &len1));
 105                 conv_src_len = len1 + c_len_term;
 106                 break;
 107
 108         case LIBNDR_FLAG_STR_SIZE2:
 109         case LIBNDR_FLAG_STR_SIZE2|LIBNDR_FLAG_STR_NOTERM:
 110                 NDR_CHECK(ndr_pull_uint16(ndr, NDR_SCALARS, &len3));
 111                 conv_src_len = len3 + c_len_term;
 112                 break;
 113
 114         case LIBNDR_FLAG_STR_SIZE2|LIBNDR_FLAG_STR_NOTERM|LIBNDR_FLAG_STR_BYTESIZE:
 115                 NDR_CHECK(ndr_pull_uint16(ndr, NDR_SCALARS, &len3));
 116                 conv_src_len = len3;
 117                 byte_mul = 1; /* the length is now absolute */
 118                 break;
 119
 120         case LIBNDR_FLAG_STR_NULLTERM:
 121                 if (byte_mul == 1) {
 122                         conv_src_len = ascii_len_n((const char *)(ndr->data+ndr->offset), ndr->data_size - ndr->offset);
 123                 } else {
 124                         conv_src_len = utf16_len_n(ndr->data+ndr->offset, ndr->data_size - ndr->offset);
 125                 }
 126                 byte_mul = 1; /* the length is now absolute */
 127                 break;
 128
 129         case LIBNDR_FLAG_STR_NOTERM:
 130                 if (!(ndr->flags & LIBNDR_FLAG_REMAINING)) {
 131                         return ndr_pull_error(ndr, NDR_ERR_STRING, "Bad string flags 0x%x (missing NDR_REMAINING)\n",
 132                                               ndr->flags & LIBNDR_STRING_FLAGS);
 133                 }
 134                 conv_src_len = ndr->data_size - ndr->offset;
 135                 byte_mul = 1; /* the length is now absolute */
 136                 break;
 137
 138         default:
 139                 return ndr_pull_error(ndr, NDR_ERR_STRING, "Bad string flags 0x%x\n",
 140                                       ndr->flags & LIBNDR_STRING_FLAGS);
 141         }
 142
 143         NDR_PULL_NEED_BYTES(ndr, conv_src_len * byte_mul);
 144         if (conv_src_len == 0) {
 145                 as = talloc_strdup(ndr->current_mem_ctx, "");
 146                 converted_size = 0;
 147         } else {
 148                 if (!do_convert) {
 149                         as = talloc_strndup(ndr->current_mem_ctx,
 150                                             (char *)ndr->data + ndr->offset,
 151                                             conv_src_len);
 152                         if (!as) {
 153                                 return ndr_pull_error(ndr, NDR_ERR_ALLOC,
 154                                                       "Failed to talloc_strndup() in RAW8 ndr_string_pull()");
 155                         }
 156                         converted_size = MIN(strlen(as)+1, conv_src_len);
 157                 } else if (!convert_string_talloc(ndr->current_mem_ctx, chset,
 158                                            CH_UNIX, ndr->data + ndr->offset,
 159                                            conv_src_len * byte_mul,
 160                                            (void **)(void *)&as,
 161                                            &converted_size)) {
 162                         return ndr_pull_error(ndr, NDR_ERR_CHARCNV,
 163                                               "Bad character conversion with flags 0x%x", flags);
 164                 }
 165         }
 166
 167         /* this is a way of detecting if a string is sent with the wrong
 168            termination */
 169         if (ndr->flags & LIBNDR_FLAG_STR_NOTERM) {
 170                 if (as && converted_size > 0 && as[converted_size-1] == '\0') {
 171                         DEBUG(6,("short string '%s', sent with NULL termination despite NOTERM flag in IDL\n", as));
 172                 }
 173         } else {
 174                 if (as && converted_size > 0 && as[converted_size-1] != '\0') {
 175                         DEBUG(6,("long string '%s', send without NULL termination (which was expected)\n", as));
 176                 }
 177         }
 178
 179         NDR_CHECK(ndr_pull_advance(ndr, conv_src_len * byte_mul));
 180         *s = as;
 181
 182         return NDR_ERR_SUCCESS;
 183 }
 184
 185
 186 /**
 187   push a general string onto the wire
 188 */
 189 _PUBLIC_ enum ndr_err_code ndr_push_string(struct ndr_push *ndr, int ndr_flags, const char *s)
 190 {
 191         ssize_t s_len, c_len;
 192         size_t d_len;
 193         int do_convert = 1, chset = CH_UTF16;
 194         unsigned flags = ndr->flags;
 195         unsigned byte_mul = 2;
 196         uint8_t *dest = NULL;
 197
 198         if (!(ndr_flags & NDR_SCALARS)) {
 199                 return NDR_ERR_SUCCESS;
 200         }
 201
 202         if (NDR_BE(ndr)) {
 203                 chset = CH_UTF16BE;
 204         }
 205
 206         s_len = s?strlen(s):0;
 207
 208         if (flags & LIBNDR_FLAG_STR_ASCII) {
 209                 chset = CH_DOS;
 210                 byte_mul = 1;
 211                 flags &= ~LIBNDR_FLAG_STR_ASCII;
 212         }
 213
 214         if (flags & LIBNDR_FLAG_STR_UTF8) {
 215                 chset = CH_UTF8;
 216                 byte_mul = 1;
 217                 flags &= ~LIBNDR_FLAG_STR_UTF8;
 218         }
 219
 220         if (flags & LIBNDR_FLAG_STR_RAW8) {
 221                 do_convert = 0;
 222                 byte_mul = 1;
 223                 flags &= ~LIBNDR_FLAG_STR_RAW8;
 224         }
 225
 226         flags &= ~LIBNDR_FLAG_STR_CONFORMANT;
 227
 228         if (!(flags & LIBNDR_FLAG_STR_NOTERM)) {
 229                 s_len++;
 230         }
 231
 232         if (!do_convert) {
 233                 d_len = s_len;
 234                 dest = (uint8_t *)talloc_strndup(ndr, s, s_len);
 235         } else if (!convert_string_talloc(ndr, CH_UNIX, chset, s, s_len,
 236                                    (void **)(void *)&dest, &d_len))
 237         {
 238                 return ndr_push_error(ndr, NDR_ERR_CHARCNV,
 239                                       "Bad character push conversion with flags 0x%x", flags);
 240         }
 241
 242         if (flags & LIBNDR_FLAG_STR_BYTESIZE) {
 243                 c_len = d_len;
 244                 flags &= ~LIBNDR_FLAG_STR_BYTESIZE;
 245         } else if (flags & LIBNDR_FLAG_STR_CHARLEN) {
 246                 c_len = (d_len / byte_mul)-1;
 247                 flags &= ~LIBNDR_FLAG_STR_CHARLEN;
 248         } else {
 249                 c_len = d_len / byte_mul;
 250         }
 251
 252         switch ((flags & LIBNDR_STRING_FLAGS) & ~LIBNDR_FLAG_STR_NOTERM) {
 253         case LIBNDR_FLAG_STR_LEN4|LIBNDR_FLAG_STR_SIZE4:
 254                 NDR_CHECK(ndr_push_uint32(ndr, NDR_SCALARS, c_len));
 255                 NDR_CHECK(ndr_push_uint32(ndr, NDR_SCALARS, 0));
 256                 NDR_CHECK(ndr_push_uint32(ndr, NDR_SCALARS, c_len));
 257                 NDR_CHECK(ndr_push_bytes(ndr, dest, d_len));
 258                 break;
 259
 260         case LIBNDR_FLAG_STR_LEN4:
 261                 NDR_CHECK(ndr_push_uint32(ndr, NDR_SCALARS, 0));
 262                 NDR_CHECK(ndr_push_uint32(ndr, NDR_SCALARS, c_len));
 263                 NDR_CHECK(ndr_push_bytes(ndr, dest, d_len));
 264                 break;
 265
 266         case LIBNDR_FLAG_STR_SIZE4:
 267                 NDR_CHECK(ndr_push_uint32(ndr, NDR_SCALARS, c_len));
 268                 NDR_CHECK(ndr_push_bytes(ndr, dest, d_len));
 269                 break;
 270
 271         case LIBNDR_FLAG_STR_SIZE2:
 272                 NDR_CHECK(ndr_push_uint16(ndr, NDR_SCALARS, c_len));
 273                 NDR_CHECK(ndr_push_bytes(ndr, dest, d_len));
 274                 break;
 275
 276         case LIBNDR_FLAG_STR_NULLTERM:
 277                 NDR_CHECK(ndr_push_bytes(ndr, dest, d_len));
 278                 break;
 279
 280         default:
 281                 if (ndr->flags & LIBNDR_FLAG_REMAINING) {
 282                         NDR_CHECK(ndr_push_bytes(ndr, dest, d_len));
 283                         break;
 284                 }
 285
 286                 return ndr_push_error(ndr, NDR_ERR_STRING, "Bad string flags 0x%x\n",
 287                                       ndr->flags & LIBNDR_STRING_FLAGS);
 288         }
 289
 290         talloc_free(dest);
 291
 292         return NDR_ERR_SUCCESS;
 293 }
 294
 295 /**
 296   push a general string onto the wire
 297 */
 298 _PUBLIC_ size_t ndr_string_array_size(struct ndr_push *ndr, const char *s)
 299 {
 300         size_t c_len;
 301         unsigned flags = ndr->flags;
 302         unsigned byte_mul = 2;
 303         unsigned c_len_term = 1;
 304
 305         if (flags & LIBNDR_FLAG_STR_RAW8) {
 306                 c_len = s?strlen(s):0;
 307         } else {
 308                 c_len = s?strlen_m(s):0;
 309         }
 310
 311         if (flags & (LIBNDR_FLAG_STR_ASCII|LIBNDR_FLAG_STR_RAW8|LIBNDR_FLAG_STR_UTF8)) {
 312                 byte_mul = 1;
 313         }
 314
 315         if (flags & LIBNDR_FLAG_STR_NOTERM) {
 316                 c_len_term = 0;
 317         }
 318
 319         c_len = c_len + c_len_term;
 320
 321         if (flags & LIBNDR_FLAG_STR_BYTESIZE) {
 322                 c_len = c_len * byte_mul;
 323         }
 324
 325         return c_len;
 326 }
 327
 328 _PUBLIC_ void ndr_print_string(struct ndr_print *ndr, const char *name, const char *s)
 329 {
 330         if (s) {
 331                 ndr->print(ndr, "%-25s: '%s'", name, s);
 332         } else {
 333                 ndr->print(ndr, "%-25s: NULL", name);
 334         }
 335 }
 336
 337 _PUBLIC_ uint32_t ndr_size_string(int ret, const char * const* string, int flags)
 338 {
 339         /* FIXME: Is this correct for all strings ? */
 340         if(!(*string)) return ret;
 341         return ret+strlen(*string)+1;
 342 }
 343
 344 /**
 345   pull a general string array from the wire
 346 */
 347 _PUBLIC_ enum ndr_err_code ndr_pull_string_array(struct ndr_pull *ndr, int ndr_flags, const char ***_a)
 348 {
 349         const char **a = NULL;
 350         uint32_t count;
 351         unsigned flags = ndr->flags;
 352         unsigned saved_flags = ndr->flags;
 353
 354         if (!(ndr_flags & NDR_SCALARS)) {
 355                 return NDR_ERR_SUCCESS;
 356         }
 357
 358         switch (flags & (LIBNDR_FLAG_STR_NULLTERM|LIBNDR_FLAG_STR_NOTERM)) {
 359         case LIBNDR_FLAG_STR_NULLTERM:
 360                 /*
 361                  * here the strings are null terminated
 362                  * but also the array is null terminated if LIBNDR_FLAG_REMAINING
 363                  * is specified
 364                  */
 365                 for (count = 0;; count++) {
 366                         TALLOC_CTX *tmp_ctx;
 367                         const char *s = NULL;
 368                         a = talloc_realloc(ndr->current_mem_ctx, a, const char *, count + 2);
 369                         NDR_ERR_HAVE_NO_MEMORY(a);
 370                         a[count]   = NULL;
 371                         a[count+1]   = NULL;
 372
 373                         tmp_ctx = ndr->current_mem_ctx;
 374                         ndr->current_mem_ctx = a;
 375                         NDR_CHECK(ndr_pull_string(ndr, ndr_flags, &s));
 376                         if ((ndr->data_size - ndr->offset) == 0 && ndr->flags & LIBNDR_FLAG_REMAINING)
 377                         {
 378                                 a[count] = s;
 379                                 break;
 380                         }
 381                         ndr->current_mem_ctx = tmp_ctx;
 382                         if (strcmp("", s)==0) {
 383                                 a[count] = NULL;
 384                                 break;
 385                         } else {
 386                                 a[count] = s;
 387                         }
 388                 }
 389
 390                 *_a =a;
 391                 break;
 392
 393         case LIBNDR_FLAG_STR_NOTERM:
 394                 if (!(ndr->flags & LIBNDR_FLAG_REMAINING)) {
 395                         return ndr_pull_error(ndr, NDR_ERR_STRING, "Bad string flags 0x%x (missing NDR_REMAINING)\n",
 396                                               ndr->flags & LIBNDR_STRING_FLAGS);
 397                 }
 398                 /*
 399                  * here the strings are not null terminated
 400                  * but serarated by a null terminator
 401                  *
 402                  * which means the same as:
 403                  * Every string is null terminated exept the last
 404                  * string is terminated by the end of the buffer
 405                  *
 406                  * as LIBNDR_FLAG_STR_NULLTERM also end at the end
 407                  * of the buffer, we can pull each string with this flag
 408                  *
 409                  * The big difference with the case LIBNDR_FLAG_STR_NOTERM +
 410                  * LIBNDR_FLAG_REMAINING is that the last string will not be null terminated
 411                  */
 412                 ndr->flags &= ~(LIBNDR_FLAG_STR_NOTERM|LIBNDR_FLAG_REMAINING);
 413                 ndr->flags |= LIBNDR_FLAG_STR_NULLTERM;
 414
 415                 for (count = 0; ((ndr->data_size - ndr->offset) > 0); count++) {
 416                         TALLOC_CTX *tmp_ctx;
 417                         const char *s = NULL;
 418                         a = talloc_realloc(ndr->current_mem_ctx, a, const char *, count + 2);
 419                         NDR_ERR_HAVE_NO_MEMORY(a);
 420                         a[count]   = NULL;
 421                         a[count+1]   = NULL;
 422
 423                         tmp_ctx = ndr->current_mem_ctx;
 424                         ndr->current_mem_ctx = a;
 425                         NDR_CHECK(ndr_pull_string(ndr, ndr_flags, &s));
 426                         ndr->current_mem_ctx = tmp_ctx;
 427                         a[count] = s;
 428                 }
 429
 430                 *_a =a;
 431                 break;
 432
 433         default:
 434                 return ndr_pull_error(ndr, NDR_ERR_STRING, "Bad string flags 0x%x\n",
 435                                       ndr->flags & LIBNDR_STRING_FLAGS);
 436         }
 437
 438         ndr->flags = saved_flags;
 439         return NDR_ERR_SUCCESS;
 440 }
 441
 442 /**
 443   push a general string array onto the wire
 444 */
 445 _PUBLIC_ enum ndr_err_code ndr_push_string_array(struct ndr_push *ndr, int ndr_flags, const char **a)
 446 {
 447         uint32_t count;
 448         unsigned flags = ndr->flags;
 449         unsigned saved_flags = ndr->flags;
 450
 451         if (!(ndr_flags & NDR_SCALARS)) {
 452                 return NDR_ERR_SUCCESS;
 453         }
 454
 455         switch (flags & LIBNDR_STRING_FLAGS) {
 456         case LIBNDR_FLAG_STR_NULLTERM:
 457                 for (count = 0; a && a[count]; count++) {
 458                         NDR_CHECK(ndr_push_string(ndr, ndr_flags, a[count]));
 459                 }
 460                 /* If LIBNDR_FLAG_REMAINING then we do not add a null terminator to the array */
 461                 if (!(flags & LIBNDR_FLAG_REMAINING))
 462                 {
 463                         NDR_CHECK(ndr_push_string(ndr, ndr_flags, ""));
 464                 }
 465                 break;
 466
 467         case LIBNDR_FLAG_STR_NOTERM:
 468                 if (!(ndr->flags & LIBNDR_FLAG_REMAINING)) {
 469                         return ndr_push_error(ndr, NDR_ERR_STRING, "Bad string flags 0x%x (missing NDR_REMAINING)\n",
 470                                               ndr->flags & LIBNDR_STRING_FLAGS);
 471                 }
 472
 473                 for (count = 0; a && a[count]; count++) {
 474                         if (count > 0) {
 475                                 ndr->flags &= ~(LIBNDR_FLAG_STR_NOTERM|LIBNDR_FLAG_REMAINING);
 476                                 ndr->flags |= LIBNDR_FLAG_STR_NULLTERM;
 477                                 NDR_CHECK(ndr_push_string(ndr, ndr_flags, ""));
 478                                 ndr->flags = saved_flags;
 479                         }
 480                         NDR_CHECK(ndr_push_string(ndr, ndr_flags, a[count]));
 481                 }
 482
 483                 break;
 484
 485         default:
 486                 return ndr_push_error(ndr, NDR_ERR_STRING, "Bad string flags 0x%x\n",
 487                                       ndr->flags & LIBNDR_STRING_FLAGS);
 488         }
 489
 490         ndr->flags = saved_flags;
 491         return NDR_ERR_SUCCESS;
 492 }
 493
 494 _PUBLIC_ void ndr_print_string_array(struct ndr_print *ndr, const char *name, const char **a)
 495 {
 496         uint32_t count;
 497         uint32_t i;
 498
 499         for (count = 0; a && a[count]; count++) {}
 500
 501         ndr->print(ndr, "%s: ARRAY(%d)", name, count);
 502         ndr->depth++;
 503         for (i=0;i<count;i++) {
 504                 char *idx=NULL;
 505                 if (asprintf(&idx, "[%d]", i) != -1) {
 506                         ndr_print_string(ndr, idx, a[i]);
 507                         free(idx);
 508                 }
 509         }
 510         ndr->depth--;
 511 }
 512
 513 _PUBLIC_ size_t ndr_size_string_array(const char **a, uint32_t count, int flags)
 514 {
 515         uint32_t i;
 516         size_t size = 0;
 517         int rawbytes = 0;
 518
 519         if (flags & LIBNDR_FLAG_STR_RAW8) {
 520                 rawbytes = 1;
 521                 flags &= ~LIBNDR_FLAG_STR_RAW8;
 522         }
 523
 524         switch (flags & LIBNDR_STRING_FLAGS) {
 525         case LIBNDR_FLAG_STR_NULLTERM:
 526                 for (i = 0; i < count; i++) {
 527                         size += rawbytes?strlen(a[i]) + 1:strlen_m_term(a[i]);
 528                 }
 529                 break;
 530         case LIBNDR_FLAG_STR_NOTERM:
 531                 for (i = 0; i < count; i++) {
 532                         size += rawbytes?strlen(a[i]):strlen_m(a[i]);
 533                 }
 534                 break;
 535         default:
 536                 return 0;
 537         }
 538
 539         return size;
 540 }
 541
 542 /**
 543  * Return number of elements in a string including the last (zeroed) element
 544  */
 545 _PUBLIC_ uint32_t ndr_string_length(const void *_var, uint32_t element_size)
 546 {
 547         uint32_t i;
 548         uint8_t zero[4] = {0,0,0,0};
 549         const char *var = (const char *)_var;
 550
 551         for (i = 0; memcmp(var+i*element_size,zero,element_size) != 0; i++);
 552
 553         return i+1;
 554 }
 555
 556 _PUBLIC_ enum ndr_err_code ndr_check_string_terminator(struct ndr_pull *ndr, uint32_t count, uint32_t element_size)
 557 {
 558         uint32_t i;
 559         uint32_t save_offset;
 560
 561         save_offset = ndr->offset;
 562         ndr_pull_advance(ndr, (count - 1) * element_size);
 563         NDR_PULL_NEED_BYTES(ndr, element_size);
 564
 565         for (i = 0; i < element_size; i++) {
 566                  if (ndr->data[ndr->offset+i] != 0) {
 567                         ndr->offset = save_offset;
 568
 569                         return ndr_pull_error(ndr, NDR_ERR_ARRAY_SIZE, "String terminator not present or outside string boundaries");
 570                  }
 571         }
 572
 573         ndr->offset = save_offset;
 574
 575         return NDR_ERR_SUCCESS;
 576 }
 577
 578 _PUBLIC_ enum ndr_err_code ndr_pull_charset(struct ndr_pull *ndr, int ndr_flags, const char **var, uint32_t length, uint8_t byte_mul, charset_t chset)
 579 {
 580         size_t converted_size;
 581
 582         if (length == 0) {
 583                 *var = talloc_strdup(ndr->current_mem_ctx, "");
 584                 return NDR_ERR_SUCCESS;
 585         }
 586
 587         if (NDR_BE(ndr) && chset == CH_UTF16) {
 588                 chset = CH_UTF16BE;
 589         }
 590
 591         NDR_PULL_NEED_BYTES(ndr, length*byte_mul);
 592
 593         if (!convert_string_talloc(ndr->current_mem_ctx, chset, CH_UNIX,
 594                                    ndr->data+ndr->offset, length*byte_mul,
 595                                    discard_const_p(void *, var),
 596                                    &converted_size))
 597         {
 598                 return ndr_pull_error(ndr, NDR_ERR_CHARCNV,
 599                                       "Bad character conversion");
 600         }
 601         NDR_CHECK(ndr_pull_advance(ndr, length*byte_mul));
 602
 603         return NDR_ERR_SUCCESS;
 604 }
 605
 606 _PUBLIC_ enum ndr_err_code ndr_push_charset(struct ndr_push *ndr, int ndr_flags, const char *var, uint32_t length, uint8_t byte_mul, charset_t chset)
 607 {
 608         ssize_t required;
 609
 610         if (NDR_BE(ndr) && chset == CH_UTF16) {
 611                 chset = CH_UTF16BE;
 612         }
 613
 614         required = byte_mul * length;
 615
 616         NDR_PUSH_NEED_BYTES(ndr, required);
 617
 618         if (required) {
 619                 size_t size = 0;
 620                 if (!convert_string(CH_UNIX, chset,
 621                              var, strlen(var),
 622                              ndr->data+ndr->offset, required, &size)) {
 623                         return ndr_push_error(ndr, NDR_ERR_CHARCNV,
 624                                       "Bad character conversion");
 625                 }
 626
 627                 /* Make sure the remaining part of the string is filled with zeroes */
 628                 if (size < required) {
 629                         memset(ndr->data+ndr->offset+size, 0, required-size);
 630                 }
 631         }
 632
 633         ndr->offset += required;
 634
 635         return NDR_ERR_SUCCESS;
 636 }
 637
 638 /* Return number of elements in a string in the specified charset */
 639 _PUBLIC_ uint32_t ndr_charset_length(const void *var, charset_t chset)
 640 {
 641         switch (chset) {
 642         /* case CH_UTF16: this has the same value as CH_UTF16LE */
 643         case CH_UTF16LE:
 644         case CH_UTF16BE:
 645         case CH_UTF16MUNGED:
 646         case CH_UTF8:
 647                 return strlen_m_ext_term((const char *)var, CH_UNIX, chset);
 648         case CH_DOS:
 649         case CH_UNIX:
 650                 return strlen((const char *)var)+1;
 651         }
 652
 653         /* Fallback, this should never happen */
 654         return strlen((const char *)var)+1;
 655 }