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, ndr_flags_type 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         libndr_flags 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         /*
  48          * We will check this flag, but from the unmodified
  49          * ndr->flags, so just remove it from flags
  50          */
  51         flags &= ~LIBNDR_FLAG_STR_NO_EMBEDDED_NUL;
  52
  53         switch (flags & LIBNDR_ENCODING_FLAGS) {
  54         case 0:
  55                 break;
  56
  57         case LIBNDR_FLAG_STR_ASCII:
  58                 chset = CH_DOS;
  59                 byte_mul = 1;
  60                 break;
  61
  62         case LIBNDR_FLAG_STR_UTF8:
  63                 chset = CH_UTF8;
  64                 byte_mul = 1;
  65                 break;
  66
  67         case LIBNDR_FLAG_STR_RAW8:
  68                 do_convert = 0;
  69                 byte_mul = 1;
  70                 break;
  71
  72         default:
  73                 return ndr_pull_error(ndr, NDR_ERR_STRING, "Bad string flags 0x%"PRI_LIBNDR_FLAGS"\n",
  74                                       ndr->flags & LIBNDR_STRING_FLAGS);
  75         }
  76         flags &= ~LIBNDR_ENCODING_FLAGS;
  77
  78         flags &= ~LIBNDR_FLAG_STR_CONFORMANT;
  79         if (flags & LIBNDR_FLAG_STR_CHARLEN) {
  80                 c_len_term = 1;
  81                 flags &= ~LIBNDR_FLAG_STR_CHARLEN;
  82         }
  83
  84         switch (flags & LIBNDR_STRING_FLAGS) {
  85         case LIBNDR_FLAG_STR_LEN4|LIBNDR_FLAG_STR_SIZE4:
  86         case LIBNDR_FLAG_STR_LEN4|LIBNDR_FLAG_STR_SIZE4|LIBNDR_FLAG_STR_NOTERM:
  87                 NDR_CHECK(ndr_pull_uint32(ndr, NDR_SCALARS, &len1));
  88                 NDR_CHECK(ndr_pull_uint32(ndr, NDR_SCALARS, &ofs));
  89                 if (ofs != 0) {
  90                         return ndr_pull_error(ndr, NDR_ERR_STRING, "non-zero array offset with string flags 0x%"PRI_LIBNDR_FLAGS"\n",
  91                                               ndr->flags & LIBNDR_STRING_FLAGS);
  92                 }
  93                 NDR_CHECK(ndr_pull_uint32(ndr, NDR_SCALARS, &len2));
  94                 if (len2 > len1) {
  95                         return ndr_pull_error(ndr, NDR_ERR_STRING,
  96                                               "Bad string lengths len1=%"PRIu32" ofs=%"PRIu32" len2=%"PRIu32"\n",
  97                                               len1, ofs, len2);
  98                 } else if (len1 != len2) {
  99                         DEBUG(6,("len1[%"PRIu32"] != len2[%"PRIu32"]\n", len1, len2));
 100                 }
 101                 conv_src_len = len2 + c_len_term;
 102                 break;
 103
 104         case LIBNDR_FLAG_STR_SIZE4:
 105         case LIBNDR_FLAG_STR_SIZE4|LIBNDR_FLAG_STR_NOTERM:
 106                 NDR_CHECK(ndr_pull_uint32(ndr, NDR_SCALARS, &len1));
 107                 conv_src_len = len1 + c_len_term;
 108                 break;
 109
 110         case LIBNDR_FLAG_STR_SIZE4|LIBNDR_FLAG_STR_NOTERM|LIBNDR_FLAG_STR_BYTESIZE:
 111                 NDR_CHECK(ndr_pull_uint32(ndr, NDR_SCALARS, &len1));
 112                 conv_src_len = len1;
 113                 byte_mul = 1; /* the length is now absolute */
 114                 break;
 115
 116         case LIBNDR_FLAG_STR_LEN4:
 117         case LIBNDR_FLAG_STR_LEN4|LIBNDR_FLAG_STR_NOTERM:
 118                 NDR_CHECK(ndr_pull_uint32(ndr, NDR_SCALARS, &ofs));
 119                 if (ofs != 0) {
 120                         return ndr_pull_error(ndr, NDR_ERR_STRING, "non-zero array offset with string flags 0x%"PRI_LIBNDR_FLAGS"\n",
 121                                               ndr->flags & LIBNDR_STRING_FLAGS);
 122                 }
 123                 NDR_CHECK(ndr_pull_uint32(ndr, NDR_SCALARS, &len1));
 124                 conv_src_len = len1 + c_len_term;
 125                 break;
 126
 127         case LIBNDR_FLAG_STR_SIZE2:
 128         case LIBNDR_FLAG_STR_SIZE2|LIBNDR_FLAG_STR_NOTERM:
 129                 NDR_CHECK(ndr_pull_uint16(ndr, NDR_SCALARS, &len3));
 130                 conv_src_len = len3 + c_len_term;
 131                 break;
 132
 133         case LIBNDR_FLAG_STR_SIZE2|LIBNDR_FLAG_STR_NOTERM|LIBNDR_FLAG_STR_BYTESIZE:
 134                 NDR_CHECK(ndr_pull_uint16(ndr, NDR_SCALARS, &len3));
 135                 conv_src_len = len3;
 136                 byte_mul = 1; /* the length is now absolute */
 137                 break;
 138
 139         case LIBNDR_FLAG_STR_NULLTERM:
 140                 /*
 141                  * We ensure that conv_src_len cannot equal 0 by
 142                  * requiring that there be enough bytes for at least
 143                  * the NULL terminator
 144                  */
 145                 if (byte_mul == 1) {
 146                         NDR_PULL_NEED_BYTES(ndr, 1);
 147                         conv_src_len = ascii_len_n((const char *)(ndr->data+ndr->offset), ndr->data_size - ndr->offset);
 148                 } else {
 149                         NDR_PULL_NEED_BYTES(ndr, 2);
 150                         conv_src_len = utf16_null_terminated_len_n(ndr->data+ndr->offset, ndr->data_size - ndr->offset);
 151                 }
 152                 byte_mul = 1; /* the length is now absolute */
 153                 break;
 154
 155         case LIBNDR_FLAG_STR_NOTERM:
 156                 if (!(ndr->flags & LIBNDR_FLAG_REMAINING)) {
 157                         return ndr_pull_error(ndr, NDR_ERR_STRING, "Bad string flags 0x%"PRI_LIBNDR_FLAGS" (missing NDR_REMAINING)\n",
 158                                               ndr->flags & LIBNDR_STRING_FLAGS);
 159                 }
 160                 conv_src_len = ndr->data_size - ndr->offset;
 161                 byte_mul = 1; /* the length is now absolute */
 162                 break;
 163
 164         default:
 165                 return ndr_pull_error(ndr, NDR_ERR_STRING, "Bad string flags 0x%"PRI_LIBNDR_FLAGS"\n",
 166                                       ndr->flags & LIBNDR_STRING_FLAGS);
 167         }
 168
 169         NDR_PULL_NEED_BYTES(ndr, conv_src_len * byte_mul);
 170         if (conv_src_len == 0) {
 171                 as = talloc_strdup(ndr->current_mem_ctx, "");
 172                 converted_size = 0;
 173                 if (!as) {
 174                         return ndr_pull_error(ndr, NDR_ERR_ALLOC,
 175                                               "Failed to talloc_strndup() in zero-length ndr_pull_string()");
 176                 }
 177         } else {
 178                 if (!do_convert) {
 179                         as = talloc_strndup(ndr->current_mem_ctx,
 180                                             (char *)ndr->data + ndr->offset,
 181                                             conv_src_len);
 182                         if (!as) {
 183                                 return ndr_pull_error(ndr, NDR_ERR_ALLOC,
 184                                                       "Failed to talloc_strndup() in RAW8 ndr_pull_string()");
 185                         }
 186                         converted_size = MIN(strlen(as)+1, conv_src_len);
 187                 } else if (!convert_string_talloc(ndr->current_mem_ctx, chset,
 188                                                   CH_UNIX, ndr->data + ndr->offset,
 189                                                   conv_src_len * byte_mul,
 190                                                   &as,
 191                                                   &converted_size)) {
 192                         return ndr_pull_error(ndr, NDR_ERR_CHARCNV,
 193                                               "Bad character conversion with flags 0x%"PRI_LIBNDR_FLAGS, flags);
 194                 }
 195         }
 196
 197         /* this is a way of detecting if a string is sent with the wrong
 198            termination */
 199         if (ndr->flags & LIBNDR_FLAG_STR_NOTERM) {
 200                 if (converted_size > 0 && as[converted_size-1] == '\0') {
 201                         DEBUG(6,("short string '%s', sent with NULL termination despite NOTERM flag in IDL\n", as));
 202                 }
 203                 /*
 204                  * We check the original ndr->flags as it has already
 205                  * been removed from the local variable flags
 206                  */
 207                 if (ndr->flags & LIBNDR_FLAG_STR_NO_EMBEDDED_NUL) {
 208                         size_t strlen_of_unix_string = strlen(as);
 209                         if (strlen_of_unix_string != converted_size) {
 210                                 return ndr_pull_error(ndr, NDR_ERR_CHARCNV,
 211                                                       "Embedded NUL at position %zu in "
 212                                                       "converted string "
 213                                                       "(and therefore source string) "
 214                                                       "despite "
 215                                                       "LIBNDR_FLAG_STR_NO_EMBEDDED_NUL\n",
 216                                                       strlen_of_unix_string);
 217                         }
 218                 }
 219         } else {
 220                 /*
 221                  * We check the original ndr->flags as it has already
 222                  * been removed from the local variable flags
 223                  */
 224                 if (ndr->flags & LIBNDR_FLAG_STR_NO_EMBEDDED_NUL) {
 225                         size_t strlen_of_unix_string = strlen(as);
 226                         if (converted_size > 0 && strlen_of_unix_string != converted_size - 1) {
 227                                 return ndr_pull_error(ndr, NDR_ERR_CHARCNV,
 228                                                       "Embedded NUL at position %zu in "
 229                                                       "converted string "
 230                                                       "(and therefore source string) "
 231                                                       "despite "
 232                                                       "LIBNDR_FLAG_STR_NO_EMBEDDED_NUL\n",
 233                                                       strlen_of_unix_string);
 234                         }
 235                 }
 236                 if (converted_size > 0 && as[converted_size-1] != '\0') {
 237                         DEBUG(6,("long string '%s', sent without NULL termination (which was expected)\n", as));
 238                 }
 239         }
 240
 241         NDR_CHECK(ndr_pull_advance(ndr, conv_src_len * byte_mul));
 242         *s = as;
 243
 244         return NDR_ERR_SUCCESS;
 245 }
 246
 247
 248 /**
 249   push a general string onto the wire
 250 */
 251 _PUBLIC_ enum ndr_err_code ndr_push_string(struct ndr_push *ndr, ndr_flags_type ndr_flags, const char *s)
 252 {
 253         ssize_t s_len, c_len;
 254         size_t d_len;
 255         int do_convert = 1, chset = CH_UTF16;
 256         libndr_flags flags = ndr->flags;
 257         unsigned byte_mul = 2;
 258         const uint8_t *dest = NULL;
 259         uint8_t *dest_to_free = NULL;
 260         static const uint8_t null_byte[] = {0};
 261         enum ndr_err_code ndr_err = NDR_ERR_SUCCESS;
 262
 263         if (!(ndr_flags & NDR_SCALARS)) {
 264                 return NDR_ERR_SUCCESS;
 265         }
 266
 267         if (NDR_BE(ndr)) {
 268                 chset = CH_UTF16BE;
 269         }
 270
 271         s_len = s?strlen(s):0;
 272
 273         /*
 274          * We will check this flag, but from the unmodified
 275          * ndr->flags, so just remove it from flags
 276          */
 277         flags &= ~LIBNDR_FLAG_STR_NO_EMBEDDED_NUL;
 278
 279         switch (flags & LIBNDR_ENCODING_FLAGS) {
 280         case 0:
 281                 break;
 282
 283         case LIBNDR_FLAG_STR_ASCII:
 284                 chset = CH_DOS;
 285                 byte_mul = 1;
 286                 break;
 287
 288         case LIBNDR_FLAG_STR_UTF8:
 289                 chset = CH_UTF8;
 290                 byte_mul = 1;
 291                 break;
 292
 293         case LIBNDR_FLAG_STR_RAW8:
 294                 do_convert = 0;
 295                 byte_mul = 1;
 296                 break;
 297
 298         default:
 299                 return ndr_push_error(ndr, NDR_ERR_STRING, "Bad string flags 0x%"PRI_LIBNDR_FLAGS"\n",
 300                                       ndr->flags & LIBNDR_STRING_FLAGS);
 301         }
 302         flags &= ~LIBNDR_ENCODING_FLAGS;
 303
 304         flags &= ~LIBNDR_FLAG_STR_CONFORMANT;
 305
 306         if (!(flags & LIBNDR_FLAG_STR_NOTERM)) {
 307                 s_len++;
 308         }
 309
 310         if (s_len == 0) {
 311                 d_len = 0;
 312                 dest = null_byte;
 313         } else if (!do_convert) {
 314                 d_len = s_len;
 315                 dest = (const uint8_t *)s;
 316         } else {
 317                 bool ok;
 318
 319                 ok = convert_string_talloc(ndr, CH_UNIX, chset, s, s_len,
 320                                            &dest_to_free, &d_len);
 321                 if (!ok) {
 322                         return ndr_push_error(ndr, NDR_ERR_CHARCNV,
 323                                               "Bad character push conversion with flags 0x%"PRI_LIBNDR_FLAGS, flags);
 324                 }
 325
 326                 dest = dest_to_free;
 327         }
 328
 329         if (flags & LIBNDR_FLAG_STR_BYTESIZE) {
 330                 c_len = d_len;
 331                 flags &= ~LIBNDR_FLAG_STR_BYTESIZE;
 332         } else if (flags & LIBNDR_FLAG_STR_CHARLEN) {
 333                 c_len = (d_len / byte_mul)-1;
 334                 flags &= ~LIBNDR_FLAG_STR_CHARLEN;
 335         } else {
 336                 c_len = d_len / byte_mul;
 337         }
 338
 339         switch (flags & LIBNDR_STRING_FLAGS) {
 340         case LIBNDR_FLAG_STR_LEN4|LIBNDR_FLAG_STR_SIZE4:
 341         case LIBNDR_FLAG_STR_LEN4|LIBNDR_FLAG_STR_SIZE4|LIBNDR_FLAG_STR_NOTERM:
 342                 ndr_err = ndr_push_uint32(ndr, NDR_SCALARS, c_len);
 343                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 344                         goto out;
 345                 }
 346                 ndr_err = ndr_push_uint32(ndr, NDR_SCALARS, 0);
 347                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 348                         goto out;
 349                 }
 350                 ndr_err = ndr_push_uint32(ndr, NDR_SCALARS, c_len);
 351                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 352                         goto out;
 353                 }
 354                 ndr_err = ndr_push_bytes(ndr, dest, d_len);
 355                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 356                         goto out;
 357                 }
 358                 break;
 359
 360         case LIBNDR_FLAG_STR_LEN4:
 361         case LIBNDR_FLAG_STR_LEN4|LIBNDR_FLAG_STR_NOTERM:
 362                 ndr_err = ndr_push_uint32(ndr, NDR_SCALARS, 0);
 363                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 364                         goto out;
 365                 }
 366                 ndr_err = ndr_push_uint32(ndr, NDR_SCALARS, c_len);
 367                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 368                         goto out;
 369                 }
 370                 ndr_err = ndr_push_bytes(ndr, dest, d_len);
 371                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 372                         goto out;
 373                 }
 374                 break;
 375
 376         case LIBNDR_FLAG_STR_SIZE4:
 377         case LIBNDR_FLAG_STR_SIZE4|LIBNDR_FLAG_STR_NOTERM:
 378                 ndr_err = ndr_push_uint32(ndr, NDR_SCALARS, c_len);
 379                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 380                         goto out;
 381                 }
 382                 ndr_err = ndr_push_bytes(ndr, dest, d_len);
 383                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 384                         goto out;
 385                 }
 386                 break;
 387
 388         case LIBNDR_FLAG_STR_SIZE2:
 389         case LIBNDR_FLAG_STR_SIZE2|LIBNDR_FLAG_STR_NOTERM:
 390                 ndr_err = ndr_push_uint16(ndr, NDR_SCALARS, c_len);
 391                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 392                         goto out;
 393                 }
 394                 ndr_err = ndr_push_bytes(ndr, dest, d_len);
 395                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 396                         goto out;
 397                 }
 398                 break;
 399
 400         case LIBNDR_FLAG_STR_NULLTERM:
 401                 ndr_err = ndr_push_bytes(ndr, dest, d_len);
 402                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 403                         goto out;
 404                 }
 405                 break;
 406
 407         default:
 408                 if (ndr->flags & LIBNDR_FLAG_REMAINING) {
 409                         ndr_err = ndr_push_bytes(ndr, dest, d_len);
 410                         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 411                                 goto out;
 412                         }
 413                         break;
 414                 }
 415
 416                 ndr_err = ndr_push_error(ndr, NDR_ERR_STRING, "Bad string flags 0x%"PRI_LIBNDR_FLAGS"\n",
 417                                          ndr->flags & LIBNDR_STRING_FLAGS);
 418                 goto out;
 419         }
 420
 421 out:
 422         talloc_free(dest_to_free);
 423         return ndr_err;
 424 }
 425
 426 /**
 427   push a general string onto the wire
 428 */
 429 _PUBLIC_ size_t ndr_string_array_size(struct ndr_push *ndr, const char *s)
 430 {
 431         size_t c_len;
 432         libndr_flags flags = ndr->flags;
 433         unsigned byte_mul = 2;
 434         unsigned c_len_term = 1;
 435
 436         if (flags & LIBNDR_FLAG_STR_RAW8) {
 437                 c_len = s?strlen(s):0;
 438         } else {
 439                 c_len = s?strlen_m(s):0;
 440         }
 441
 442         if (flags & (LIBNDR_FLAG_STR_ASCII|LIBNDR_FLAG_STR_RAW8|LIBNDR_FLAG_STR_UTF8)) {
 443                 byte_mul = 1;
 444         }
 445
 446         if (flags & LIBNDR_FLAG_STR_NOTERM) {
 447                 c_len_term = 0;
 448         }
 449
 450         c_len = c_len + c_len_term;
 451
 452         if (flags & LIBNDR_FLAG_STR_BYTESIZE) {
 453                 c_len = c_len * byte_mul;
 454         }
 455
 456         return c_len;
 457 }
 458
 459 _PUBLIC_ void ndr_print_string(struct ndr_print *ndr, const char *name, const char *s)
 460 {
 461         if (NDR_HIDE_SECRET(ndr)) {
 462                 ndr->print(ndr, "%-25s: <REDACTED SECRET VALUE>", name);
 463                 return;
 464         }
 465         if (s) {
 466                 ndr->print(ndr, "%-25s: '%s'", name, s);
 467         } else {
 468                 ndr->print(ndr, "%-25s: NULL", name);
 469         }
 470 }
 471
 472 _PUBLIC_ uint32_t ndr_size_string(int ret, const char * const* string, ndr_flags_type flags)
 473 {
 474         /* FIXME: Is this correct for all strings ? */
 475         if(!(*string)) return ret;
 476         return ret+strlen(*string)+1;
 477 }
 478
 479 /**
 480   pull a UTF‐16 string from the wire
 481 */
 482 _PUBLIC_ enum ndr_err_code ndr_pull_u16string(struct ndr_pull *ndr,
 483                                               ndr_flags_type ndr_flags,
 484                                               const unsigned char **s)
 485 {
 486         unsigned char *as = NULL;
 487         const char *const src_str = (char *)ndr->data + ndr->offset;
 488         size_t src_len = 0;
 489
 490         if (!(ndr_flags & NDR_SCALARS)) {
 491                 return NDR_ERR_SUCCESS;
 492         }
 493
 494         if (NDR_BE(ndr)) {
 495                 /*
 496                  * It isn’t clear how this type should be encoded in a
 497                  * big‐endian context.
 498                  */
 499                 return ndr_pull_error(
 500                         ndr,
 501                         NDR_ERR_STRING,
 502                         "u16string does not support big‐endian encoding\n");
 503         }
 504
 505         if (ndr->flags & LIBNDR_ENCODING_FLAGS) {
 506                 return ndr_pull_error(
 507                         ndr,
 508                         NDR_ERR_STRING,
 509                         "Unsupported string flags 0x%" PRI_LIBNDR_FLAGS
 510                         " passed to ndr_pull_u16string()\n",
 511                         ndr->flags & LIBNDR_STRING_FLAGS);
 512         }
 513
 514         switch (ndr->flags & LIBNDR_STRING_FLAGS) {
 515         case LIBNDR_FLAG_STR_NULLTERM:
 516                 /*
 517                  * We ensure that src_len cannot equal 0 by
 518                  * requiring that there be enough bytes for at least
 519                  * the NULL terminator
 520                  */
 521                 NDR_PULL_NEED_BYTES(ndr, 2);
 522                 src_len = utf16_null_terminated_len_n(src_str,
 523                                                       ndr->data_size -
 524                                                               ndr->offset);
 525                 break;
 526
 527         default:
 528                 return ndr_pull_error(
 529                         ndr,
 530                         NDR_ERR_STRING,
 531                         "Unsupported string flags 0x%" PRI_LIBNDR_FLAGS
 532                         " passed to ndr_pull_u16string()\n",
 533                         ndr->flags & LIBNDR_STRING_FLAGS);
 534         }
 535
 536         NDR_PULL_NEED_BYTES(ndr, src_len);
 537         as = talloc_utf16_strlendup(ndr->current_mem_ctx,
 538                                     src_str,
 539                                     src_len);
 540         if (as == NULL) {
 541                 return ndr_pull_error(ndr,
 542                                       NDR_ERR_ALLOC,
 543                                       "Failed to talloc_utf16_strlendup() in "
 544                                       "ndr_pull_u16string()");
 545         }
 546
 547         NDR_CHECK(ndr_pull_advance(ndr, src_len));
 548         *s = as;
 549
 550         return NDR_ERR_SUCCESS;
 551 }
 552
 553 /**
 554   push a UTF‐16 string onto the wire
 555 */
 556 _PUBLIC_ enum ndr_err_code ndr_push_u16string(struct ndr_push *ndr,
 557                                               ndr_flags_type ndr_flags,
 558                                               const unsigned char *s)
 559 {
 560         size_t s_len;
 561
 562         if (!(ndr_flags & NDR_SCALARS)) {
 563                 return NDR_ERR_SUCCESS;
 564         }
 565
 566         if (NDR_BE(ndr)) {
 567                 /*
 568                  * It isn’t clear how this type should be encoded in a
 569                  * big‐endian context.
 570                  */
 571                 return ndr_push_error(
 572                         ndr,
 573                         NDR_ERR_STRING,
 574                         "u16string does not support big‐endian encoding\n");
 575         }
 576
 577         if (s == NULL) {
 578                 return ndr_push_error(
 579                         ndr,
 580                         NDR_ERR_INVALID_POINTER,
 581                         "NULL pointer passed to ndr_push_u16string()");
 582         }
 583
 584         s_len = utf16_null_terminated_len(s);
 585         if (s_len > UINT32_MAX) {
 586                 return ndr_push_error(
 587                         ndr,
 588                         NDR_ERR_LENGTH,
 589                         "length overflow in ndr_push_u16string()");
 590         }
 591
 592         if (ndr->flags & LIBNDR_ENCODING_FLAGS) {
 593                 return ndr_push_error(
 594                         ndr,
 595                         NDR_ERR_STRING,
 596                         "Unsupported string flags 0x%" PRI_LIBNDR_FLAGS
 597                         " passed to ndr_push_u16string()\n",
 598                         ndr->flags & LIBNDR_STRING_FLAGS);
 599         }
 600
 601         switch (ndr->flags & LIBNDR_STRING_FLAGS) {
 602         case LIBNDR_FLAG_STR_NULLTERM:
 603                 NDR_CHECK(ndr_push_bytes(ndr, s, s_len));
 604                 break;
 605
 606         default:
 607                 if (ndr->flags & LIBNDR_FLAG_REMAINING) {
 608                         NDR_CHECK(ndr_push_bytes(ndr, s, s_len));
 609                         break;
 610                 }
 611
 612                 return ndr_push_error(
 613                         ndr,
 614                         NDR_ERR_STRING,
 615                         "Unsupported string flags 0x%" PRI_LIBNDR_FLAGS
 616                         " passed to ndr_push_u16string()\n",
 617                         ndr->flags & LIBNDR_STRING_FLAGS);
 618         }
 619
 620         return NDR_ERR_SUCCESS;
 621 }
 622
 623 _PUBLIC_ void ndr_print_u16string(struct ndr_print *ndr,
 624                                   const char *name,
 625                                   const unsigned char *s)
 626 {
 627         return ndr_print_array_uint8(ndr,
 628                                      name,
 629                                      s,
 630                                      utf16_len(s));
 631 }
 632
 633 static uint32_t guess_string_array_size(struct ndr_pull *ndr, ndr_flags_type ndr_flags)
 634 {
 635         /*
 636          * Here we could do something clever like count the number of zeros in
 637          * the ndr data, but it is probably sufficient to pick a lowish number
 638          * (compared to the overhead of the talloc header) and let the
 639          * exponential resizing deal with longer arrays.
 640          */
 641         return 5;
 642 }
 643
 644 static enum ndr_err_code extend_string_array(struct ndr_pull *ndr,
 645                                              const char ***_a,
 646                                              uint32_t *count)
 647 {
 648         const char **a = *_a;
 649         uint32_t inc = *count / 4 + 3;
 650         uint32_t alloc_size = *count + inc;
 651
 652         if (alloc_size < *count) {
 653                 /* overflow ! */
 654                 return NDR_ERR_ALLOC;
 655         }
 656         /*
 657          * We allocate and zero two more bytes than we report back, so that
 658          * the string array will always be NULL terminated.
 659          */
 660         a = talloc_realloc(ndr->current_mem_ctx, a,
 661                            const char *,
 662                            alloc_size);
 663         NDR_ERR_HAVE_NO_MEMORY(a);
 664
 665         memset(a + *count, 0, inc * sizeof(a[0]));
 666         *_a = a;
 667         *count = alloc_size - 2;
 668         return NDR_ERR_SUCCESS;
 669 }
 670
 671 /**
 672   pull a general string array from the wire
 673 */
 674 _PUBLIC_ enum ndr_err_code ndr_pull_string_array(struct ndr_pull *ndr, ndr_flags_type ndr_flags, const char ***_a)
 675 {
 676         const char **a = NULL;
 677         uint32_t count;
 678         libndr_flags flags = ndr->flags;
 679         libndr_flags saved_flags = ndr->flags;
 680         uint32_t alloc_size;
 681
 682         if (!(ndr_flags & NDR_SCALARS)) {
 683                 return NDR_ERR_SUCCESS;
 684         }
 685
 686         alloc_size = guess_string_array_size(ndr, ndr_flags);
 687         a = talloc_zero_array(ndr->current_mem_ctx, const char *, alloc_size + 2);
 688         NDR_ERR_HAVE_NO_MEMORY(a);
 689
 690         switch (flags & (LIBNDR_FLAG_STR_NULLTERM|LIBNDR_FLAG_STR_NOTERM)) {
 691         case LIBNDR_FLAG_STR_NULLTERM:
 692                 /*
 693                  * here the strings are null terminated
 694                  * but also the array is null terminated if LIBNDR_FLAG_REMAINING
 695                  * is specified
 696                  */
 697                 for (count = 0;; count++) {
 698                         TALLOC_CTX *tmp_ctx;
 699                         const char *s = NULL;
 700                         if (count == alloc_size) {
 701                                 NDR_CHECK(extend_string_array(ndr,
 702                                                               &a,
 703                                                               &alloc_size));
 704                         }
 705
 706                         tmp_ctx = ndr->current_mem_ctx;
 707                         ndr->current_mem_ctx = a;
 708                         NDR_CHECK(ndr_pull_string(ndr, ndr_flags, &s));
 709                         ndr->current_mem_ctx = tmp_ctx;
 710                         if ((ndr->data_size - ndr->offset) == 0 && ndr->flags & LIBNDR_FLAG_REMAINING)
 711                         {
 712                                 a[count] = s;
 713                                 break;
 714                         }
 715                         if (strcmp("", s)==0) {
 716                                 a[count] = NULL;
 717                                 break;
 718                         } else {
 719                                 a[count] = s;
 720                         }
 721                 }
 722
 723                 *_a =a;
 724                 break;
 725
 726         case LIBNDR_FLAG_STR_NOTERM:
 727                 if (!(ndr->flags & LIBNDR_FLAG_REMAINING)) {
 728                         return ndr_pull_error(ndr, NDR_ERR_STRING, "Bad string flags 0x%"PRI_LIBNDR_FLAGS" (missing NDR_REMAINING)\n",
 729                                               ndr->flags & LIBNDR_STRING_FLAGS);
 730                 }
 731                 /*
 732                  * here the strings are not null terminated
 733                  * but separated by a null terminator
 734                  *
 735                  * which means the same as:
 736                  * Every string is null terminated except the last
 737                  * string is terminated by the end of the buffer
 738                  *
 739                  * as LIBNDR_FLAG_STR_NULLTERM also end at the end
 740                  * of the buffer, we can pull each string with this flag
 741                  *
 742                  * The big difference with the case LIBNDR_FLAG_STR_NOTERM +
 743                  * LIBNDR_FLAG_REMAINING is that the last string will not be null terminated
 744                  */
 745                 ndr->flags &= ~(LIBNDR_FLAG_STR_NOTERM|LIBNDR_FLAG_REMAINING);
 746                 ndr->flags |= LIBNDR_FLAG_STR_NULLTERM;
 747
 748                 for (count = 0; ((ndr->data_size - ndr->offset) > 0); count++) {
 749                         TALLOC_CTX *tmp_ctx;
 750                         const char *s = NULL;
 751                         if (count == alloc_size) {
 752                                 NDR_CHECK(extend_string_array(ndr,
 753                                                               &a,
 754                                                               &alloc_size));
 755                         }
 756
 757                         tmp_ctx = ndr->current_mem_ctx;
 758                         ndr->current_mem_ctx = a;
 759                         NDR_CHECK(ndr_pull_string(ndr, ndr_flags, &s));
 760                         ndr->current_mem_ctx = tmp_ctx;
 761                         a[count] = s;
 762                 }
 763
 764                 a = talloc_realloc(ndr->current_mem_ctx, a, const char *, count + 1);
 765                 NDR_ERR_HAVE_NO_MEMORY(a);
 766                 *_a = a;
 767                 break;
 768
 769         default:
 770                 return ndr_pull_error(ndr, NDR_ERR_STRING, "Bad string flags 0x%"PRI_LIBNDR_FLAGS"\n",
 771                                       ndr->flags & LIBNDR_STRING_FLAGS);
 772         }
 773
 774         ndr->flags = saved_flags;
 775         return NDR_ERR_SUCCESS;
 776 }
 777
 778 /**
 779   push a general string array onto the wire
 780 */
 781 _PUBLIC_ enum ndr_err_code ndr_push_string_array(struct ndr_push *ndr, ndr_flags_type ndr_flags, const char **a)
 782 {
 783         uint32_t count;
 784         libndr_flags flags = ndr->flags;
 785         libndr_flags saved_flags = ndr->flags;
 786
 787         if (!(ndr_flags & NDR_SCALARS)) {
 788                 return NDR_ERR_SUCCESS;
 789         }
 790
 791         switch (flags & LIBNDR_STRING_FLAGS) {
 792         case LIBNDR_FLAG_STR_NULLTERM:
 793                 for (count = 0; a && a[count]; count++) {
 794                         NDR_CHECK(ndr_push_string(ndr, ndr_flags, a[count]));
 795                 }
 796                 /* If LIBNDR_FLAG_REMAINING then we do not add a null terminator to the array */
 797                 if (!(flags & LIBNDR_FLAG_REMAINING))
 798                 {
 799                         NDR_CHECK(ndr_push_string(ndr, ndr_flags, ""));
 800                 }
 801                 break;
 802
 803         case LIBNDR_FLAG_STR_NOTERM:
 804                 if (!(ndr->flags & LIBNDR_FLAG_REMAINING)) {
 805                         return ndr_push_error(ndr, NDR_ERR_STRING, "Bad string flags 0x%"PRI_LIBNDR_FLAGS" (missing NDR_REMAINING)\n",
 806                                               ndr->flags & LIBNDR_STRING_FLAGS);
 807                 }
 808
 809                 for (count = 0; a && a[count]; count++) {
 810                         if (count > 0) {
 811                                 ndr->flags &= ~(LIBNDR_FLAG_STR_NOTERM|LIBNDR_FLAG_REMAINING);
 812                                 ndr->flags |= LIBNDR_FLAG_STR_NULLTERM;
 813                                 NDR_CHECK(ndr_push_string(ndr, ndr_flags, ""));
 814                                 ndr->flags = saved_flags;
 815                         }
 816                         NDR_CHECK(ndr_push_string(ndr, ndr_flags, a[count]));
 817                 }
 818
 819                 break;
 820
 821         default:
 822                 return ndr_push_error(ndr, NDR_ERR_STRING, "Bad string flags 0x%"PRI_LIBNDR_FLAGS"\n",
 823                                       ndr->flags & LIBNDR_STRING_FLAGS);
 824         }
 825
 826         ndr->flags = saved_flags;
 827         return NDR_ERR_SUCCESS;
 828 }
 829
 830 _PUBLIC_ void ndr_print_string_array(struct ndr_print *ndr, const char *name, const char **a)
 831 {
 832         uint32_t count;
 833         uint32_t i;
 834
 835         for (count = 0; a && a[count]; count++) {}
 836
 837         ndr->print(ndr, "%s: ARRAY(%"PRIu32")", name, count);
 838         ndr->depth++;
 839         for (i=0;i<count;i++) {
 840                 char *idx=NULL;
 841                 if (asprintf(&idx, "[%"PRIu32"]", i) != -1) {
 842                         ndr_print_string(ndr, idx, a[i]);
 843                         free(idx);
 844                 }
 845         }
 846         ndr->depth--;
 847 }
 848
 849 _PUBLIC_ size_t ndr_size_string_array(const char **a, uint32_t count, libndr_flags flags)
 850 {
 851         uint32_t i;
 852         size_t size = 0;
 853         int rawbytes = 0;
 854
 855         if (flags & LIBNDR_FLAG_STR_RAW8) {
 856                 rawbytes = 1;
 857                 flags &= ~LIBNDR_FLAG_STR_RAW8;
 858         }
 859
 860         switch (flags & LIBNDR_STRING_FLAGS) {
 861         case LIBNDR_FLAG_STR_NULLTERM:
 862                 for (i = 0; i < count; i++) {
 863                         size += rawbytes?strlen(a[i]) + 1:strlen_m_term(a[i]);
 864                 }
 865                 break;
 866         case LIBNDR_FLAG_STR_NOTERM:
 867                 for (i = 0; i < count; i++) {
 868                         size += rawbytes?strlen(a[i]):strlen_m(a[i]);
 869                 }
 870                 break;
 871         default:
 872                 return 0;
 873         }
 874
 875         return size;
 876 }
 877
 878 /**
 879  * Return number of elements in a string including the last (zeroed) element
 880  */
 881 _PUBLIC_ uint32_t ndr_string_length(const void *_var, uint32_t element_size)
 882 {
 883         uint32_t i;
 884         uint8_t zero[4] = {0,0,0,0};
 885         const char *var = (const char *)_var;
 886
 887         for (i = 0; memcmp(var+i*element_size,zero,element_size) != 0; i++);
 888
 889         return i+1;
 890 }
 891
 892 /**
 893  * @brief Get the string length including the null terminator if available.
 894  *
 895  * This checks the string length based on the elements. The returned number
 896  * includes the terminating null byte(s) if found.
 897  *
 898  * @param[in]  _var    The string to calculate the length for.
 899  *
 900  * @param[in]  length  The length of the buffer passed by _var.
 901  *
 902  * @param[in]  element_size The element_size of a string char in bytes.
 903  *
 904  * @return The length of the strings or 0.
 905  */
 906 static uint32_t ndr_string_n_length(const void *_var,
 907                                     size_t length,
 908                                     uint32_t element_size)
 909 {
 910         size_t i = 0;
 911         uint8_t zero[4] = {0,0,0,0};
 912         const char *var = (const char *)_var;
 913         int cmp;
 914
 915         if (element_size > 4) {
 916                 return 0;
 917         }
 918
 919         for (i = 0; i < length; i++, var += element_size) {
 920                 cmp = memcmp(var, zero, element_size);
 921                 if (cmp == 0) {
 922                         break;
 923                 }
 924         }
 925
 926         if (i == length) {
 927                 return length;
 928         }
 929
 930         return i + 1;
 931 }
 932
 933 _PUBLIC_ enum ndr_err_code ndr_check_string_terminator(struct ndr_pull *ndr, uint32_t count, uint32_t element_size)
 934 {
 935         uint32_t i;
 936         uint32_t save_offset;
 937
 938         if (count == 0) {
 939                 return NDR_ERR_RANGE;
 940         }
 941
 942         if (element_size && count - 1 > UINT32_MAX / element_size) {
 943                 return NDR_ERR_RANGE;
 944         }
 945
 946         save_offset = ndr->offset;
 947         NDR_CHECK(ndr_pull_advance(ndr, (count - 1) * element_size));
 948         NDR_PULL_NEED_BYTES(ndr, element_size);
 949
 950         for (i = 0; i < element_size; i++) {
 951                 if (ndr->data[ndr->offset+i] != 0) {
 952                         ndr->offset = save_offset;
 953
 954                         return ndr_pull_error(ndr, NDR_ERR_ARRAY_SIZE, "String terminator not present or outside string boundaries");
 955                 }
 956         }
 957
 958         ndr->offset = save_offset;
 959
 960         return NDR_ERR_SUCCESS;
 961 }
 962
 963 _PUBLIC_ enum ndr_err_code ndr_pull_charset(struct ndr_pull *ndr, ndr_flags_type ndr_flags, const char **var, uint32_t length, uint8_t byte_mul, charset_t chset)
 964 {
 965         size_t converted_size;
 966
 967         if (length == 0) {
 968                 *var = talloc_strdup(ndr->current_mem_ctx, "");
 969                 if (*var == NULL) {
 970                         return ndr_pull_error(ndr, NDR_ERR_ALLOC,
 971                                               "Failed to talloc_strdup() in ndr_pull_charset()");
 972                 }
 973                 return NDR_ERR_SUCCESS;
 974         }
 975
 976         if (NDR_BE(ndr) && chset == CH_UTF16) {
 977                 chset = CH_UTF16BE;
 978         }
 979
 980         if ((byte_mul != 0) && (length > UINT32_MAX/byte_mul)) {
 981                 return ndr_pull_error(ndr, NDR_ERR_BUFSIZE, "length overflow");
 982         }
 983         NDR_PULL_NEED_BYTES(ndr, length*byte_mul);
 984
 985         if (!convert_string_talloc(ndr->current_mem_ctx, chset, CH_UNIX,
 986                                    ndr->data+ndr->offset, length*byte_mul,
 987                                    var,
 988                                    &converted_size))
 989         {
 990                 return ndr_pull_error(ndr, NDR_ERR_CHARCNV,
 991                                       "Bad character conversion");
 992         }
 993         NDR_CHECK(ndr_pull_advance(ndr, length*byte_mul));
 994
 995         return NDR_ERR_SUCCESS;
 996 }
 997
 998 _PUBLIC_ enum ndr_err_code ndr_pull_charset_to_null(struct ndr_pull *ndr, ndr_flags_type ndr_flags, const char **var, uint32_t length, uint8_t byte_mul, charset_t chset)
 999 {
1000         size_t converted_size;
1001         uint32_t str_len;
1002
1003         if (length == 0) {
1004                 *var = talloc_strdup(ndr->current_mem_ctx, "");
1005                 if (*var == NULL) {
1006                         return ndr_pull_error(ndr, NDR_ERR_ALLOC,
1007                                               "Failed to talloc_strdup() in ndr_pull_charset_to_null()");
1008                 }
1009                 return NDR_ERR_SUCCESS;
1010         }
1011
1012         if (NDR_BE(ndr) && chset == CH_UTF16) {
1013                 chset = CH_UTF16BE;
1014         }
1015
1016         if ((byte_mul != 0) && (length > UINT32_MAX/byte_mul)) {
1017                 return ndr_pull_error(ndr, NDR_ERR_BUFSIZE, "length overflow");
1018         }
1019         NDR_PULL_NEED_BYTES(ndr, length*byte_mul);
1020
1021         str_len = ndr_string_n_length(ndr->data+ndr->offset, length, byte_mul);
1022         if (str_len == 0) {
1023                 return ndr_pull_error(ndr, NDR_ERR_LENGTH,
1024                                       "Invalid length");
1025         }
1026
1027         if (!convert_string_talloc(ndr->current_mem_ctx, chset, CH_UNIX,
1028                                    ndr->data+ndr->offset, str_len*byte_mul,
1029                                    var,
1030                                    &converted_size))
1031         {
1032                 return ndr_pull_error(ndr, NDR_ERR_CHARCNV,
1033                                       "Bad character conversion");
1034         }
1035         NDR_CHECK(ndr_pull_advance(ndr, length*byte_mul));
1036
1037         return NDR_ERR_SUCCESS;
1038 }
1039
1040 _PUBLIC_ enum ndr_err_code ndr_push_charset(struct ndr_push *ndr, ndr_flags_type ndr_flags, const char *var, uint32_t length, uint8_t byte_mul, charset_t chset)
1041 {
1042         size_t required;
1043
1044         if (NDR_BE(ndr) && chset == CH_UTF16) {
1045                 chset = CH_UTF16BE;
1046         }
1047
1048         if ((byte_mul != 0) && (length > SIZE_MAX/byte_mul)) {
1049                 return ndr_push_error(ndr, NDR_ERR_LENGTH, "length overflow");
1050         }
1051         required = byte_mul * length;
1052
1053         NDR_PUSH_NEED_BYTES(ndr, required);
1054
1055         if (required) {
1056                 size_t size = 0;
1057
1058                 if (var == NULL) {
1059                         return ndr_push_error(ndr, NDR_ERR_INVALID_POINTER, "NULL [ref] pointer");
1060                 }
1061
1062                 if (!convert_string(CH_UNIX, chset,
1063                                     var, strlen(var),
1064                                     ndr->data+ndr->offset, required, &size)) {
1065                         return ndr_push_error(ndr, NDR_ERR_CHARCNV,
1066                                               "Bad character conversion");
1067                 }
1068
1069                 /* Make sure the remaining part of the string is filled with zeroes */
1070                 if (size < required) {
1071                         memset(ndr->data+ndr->offset+size, 0, required-size);
1072                 }
1073         }
1074
1075         ndr->offset += required;
1076
1077         return NDR_ERR_SUCCESS;
1078 }
1079
1080 _PUBLIC_ enum ndr_err_code ndr_push_charset_to_null(struct ndr_push *ndr, ndr_flags_type ndr_flags, const char *var, uint32_t length, uint8_t byte_mul, charset_t chset)
1081 {
1082         const char *str = var;
1083
1084         if (str == NULL) {
1085                 str = "\0"; /* i.e. two zero bytes, for UTF16 null word. */
1086                 length = 1;
1087         }
1088
1089         return ndr_push_charset(ndr, ndr_flags, str, length, byte_mul, chset);
1090 }
1091
1092 /* Return number of elements in a string in the specified charset */
1093 _PUBLIC_ uint32_t ndr_charset_length(const void *var, charset_t chset)
1094 {
1095         switch (chset) {
1096         /* case CH_UTF16: this has the same value as CH_UTF16LE */
1097         case CH_UTF16LE:
1098         case CH_UTF16BE:
1099         case CH_UTF16MUNGED:
1100         case CH_UTF8:
1101                 return strlen_m_ext_term((const char *)var, CH_UNIX, chset);
1102         case CH_DOS:
1103         case CH_UNIX:
1104                 return strlen((const char *)var)+1;
1105         default:
1106                 /* Fallback, this should never happen */
1107                 return strlen((const char *)var)+1;
1108         }
1109 }