lib/util/util.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Samba utility functions
   4    Copyright (C) Andrew Tridgell 1992-1998
   5    Copyright (C) Jeremy Allison 2001-2002
   6    Copyright (C) Simo Sorce 2001
   7    Copyright (C) Jim McDonough (jmcd@us.ibm.com)  2003.
   8    Copyright (C) James J Myers 2003
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 3 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  22 */
  23
  24 #include "includes.h"
  25 #include "system/network.h"
  26 #include "system/filesys.h"
  27 #include "system/locale.h"
  28 #undef malloc
  29 #undef strcasecmp
  30 #undef strncasecmp
  31 #undef strdup
  32 #undef realloc
  33
  34 /**
  35  * @file
  36  * @brief Misc utility functions
  37  */
  38
  39 /**
  40  Find a suitable temporary directory. The result should be copied immediately
  41  as it may be overwritten by a subsequent call.
  42 **/
  43 _PUBLIC_ const char *tmpdir(void)
  44 {
  45         char *p;
  46         if ((p = getenv("TMPDIR")))
  47                 return p;
  48         return "/tmp";
  49 }
  50
  51
  52 /**
  53  Check if a file exists - call vfs_file_exist for samba files.
  54 **/
  55 _PUBLIC_ bool file_exist(const char *fname)
  56 {
  57         struct stat st;
  58
  59         if (stat(fname, &st) != 0) {
  60                 return false;
  61         }
  62
  63         return ((S_ISREG(st.st_mode)) || (S_ISFIFO(st.st_mode)));
  64 }
  65
  66 /**
  67  Check a files mod time.
  68 **/
  69
  70 _PUBLIC_ time_t file_modtime(const char *fname)
  71 {
  72         struct stat st;
  73
  74         if (stat(fname,&st) != 0)
  75                 return(0);
  76
  77         return(st.st_mtime);
  78 }
  79
  80 /**
  81  Check if a directory exists.
  82 **/
  83
  84 _PUBLIC_ bool directory_exist(const char *dname)
  85 {
  86         struct stat st;
  87         bool ret;
  88
  89         if (stat(dname,&st) != 0) {
  90                 return false;
  91         }
  92
  93         ret = S_ISDIR(st.st_mode);
  94         if(!ret)
  95                 errno = ENOTDIR;
  96         return ret;
  97 }
  98
  99 /**
 100  * Try to create the specified directory if it didn't exist.
 101  *
 102  * @retval true if the directory already existed and has the right permissions
 103  * or was successfully created.
 104  */
 105 _PUBLIC_ bool directory_create_or_exist(const char *dname, uid_t uid,
 106                                mode_t dir_perms)
 107 {
 108         mode_t old_umask;
 109         struct stat st;
 110
 111         old_umask = umask(0);
 112         if (lstat(dname, &st) == -1) {
 113                 if (errno == ENOENT) {
 114                         /* Create directory */
 115                         if (mkdir(dname, dir_perms) == -1) {
 116                                 DEBUG(0, ("error creating directory "
 117                                           "%s: %s\n", dname,
 118                                           strerror(errno)));
 119                                 umask(old_umask);
 120                                 return false;
 121                         }
 122                 } else {
 123                         DEBUG(0, ("lstat failed on directory %s: %s\n",
 124                                   dname, strerror(errno)));
 125                         umask(old_umask);
 126                         return false;
 127                 }
 128         } else {
 129                 /* Check ownership and permission on existing directory */
 130                 if (!S_ISDIR(st.st_mode)) {
 131                         DEBUG(0, ("directory %s isn't a directory\n",
 132                                 dname));
 133                         umask(old_umask);
 134                         return false;
 135                 }
 136                 if ((st.st_uid != uid) ||
 137                     ((st.st_mode & 0777) != dir_perms)) {
 138                         DEBUG(0, ("invalid permissions on directory "
 139                                   "%s\n", dname));
 140                         umask(old_umask);
 141                         return false;
 142                 }
 143         }
 144         return true;
 145 }
 146
 147
 148 /**
 149  Set a fd into blocking/nonblocking mode. Uses POSIX O_NONBLOCK if available,
 150  else
 151   if SYSV use O_NDELAY
 152   if BSD use FNDELAY
 153 **/
 154
 155 _PUBLIC_ int set_blocking(int fd, bool set)
 156 {
 157         int val;
 158 #ifdef O_NONBLOCK
 159 #define FLAG_TO_SET O_NONBLOCK
 160 #else
 161 #ifdef SYSV
 162 #define FLAG_TO_SET O_NDELAY
 163 #else /* BSD */
 164 #define FLAG_TO_SET FNDELAY
 165 #endif
 166 #endif
 167
 168         if((val = fcntl(fd, F_GETFL, 0)) == -1)
 169                 return -1;
 170         if(set) /* Turn blocking on - ie. clear nonblock flag */
 171                 val &= ~FLAG_TO_SET;
 172         else
 173                 val |= FLAG_TO_SET;
 174         return fcntl( fd, F_SETFL, val);
 175 #undef FLAG_TO_SET
 176 }
 177
 178
 179 /**
 180  Sleep for a specified number of milliseconds.
 181 **/
 182
 183 _PUBLIC_ void msleep(unsigned int t)
 184 {
 185         struct timeval tval;
 186
 187         tval.tv_sec = t/1000;
 188         tval.tv_usec = 1000*(t%1000);
 189         /* this should be the real select - do NOT replace
 190            with sys_select() */
 191         select(0,NULL,NULL,NULL,&tval);
 192 }
 193
 194 /**
 195  Get my own name, return in talloc'ed storage.
 196 **/
 197
 198 _PUBLIC_ char *get_myname(TALLOC_CTX *ctx)
 199 {
 200         char *p;
 201         char hostname[HOST_NAME_MAX];
 202
 203         /* get my host name */
 204         if (gethostname(hostname, sizeof(hostname)) == -1) {
 205                 DEBUG(0,("gethostname failed\n"));
 206                 return NULL;
 207         }
 208
 209         /* Ensure null termination. */
 210         hostname[sizeof(hostname)-1] = '\0';
 211
 212         /* split off any parts after an initial . */
 213         p = strchr_m(hostname, '.');
 214         if (p) {
 215                 *p = 0;
 216         }
 217
 218         return talloc_strdup(ctx, hostname);
 219 }
 220
 221 /**
 222  Check if a process exists. Does this work on all unixes?
 223 **/
 224
 225 _PUBLIC_ bool process_exists_by_pid(pid_t pid)
 226 {
 227         /* Doing kill with a non-positive pid causes messages to be
 228          * sent to places we don't want. */
 229         SMB_ASSERT(pid > 0);
 230         return(kill(pid,0) == 0 || errno != ESRCH);
 231 }
 232
 233 /**
 234  Simple routine to do POSIX file locking. Cruft in NFS and 64->32 bit mapping
 235  is dealt with in posix.c
 236 **/
 237
 238 _PUBLIC_ bool fcntl_lock(int fd, int op, off_t offset, off_t count, int type)
 239 {
 240         struct flock lock;
 241         int ret;
 242
 243         DEBUG(8,("fcntl_lock %d %d %.0f %.0f %d\n",fd,op,(double)offset,(double)count,type));
 244
 245         lock.l_type = type;
 246         lock.l_whence = SEEK_SET;
 247         lock.l_start = offset;
 248         lock.l_len = count;
 249         lock.l_pid = 0;
 250
 251         ret = fcntl(fd,op,&lock);
 252
 253         if (ret == -1 && errno != 0)
 254                 DEBUG(3,("fcntl_lock: fcntl lock gave errno %d (%s)\n",errno,strerror(errno)));
 255
 256         /* a lock query */
 257         if (op == F_GETLK) {
 258                 if ((ret != -1) &&
 259                                 (lock.l_type != F_UNLCK) &&
 260                                 (lock.l_pid != 0) &&
 261                                 (lock.l_pid != getpid())) {
 262                         DEBUG(3,("fcntl_lock: fd %d is locked by pid %d\n",fd,(int)lock.l_pid));
 263                         return true;
 264                 }
 265
 266                 /* it must be not locked or locked by me */
 267                 return false;
 268         }
 269
 270         /* a lock set or unset */
 271         if (ret == -1) {
 272                 DEBUG(3,("fcntl_lock: lock failed at offset %.0f count %.0f op %d type %d (%s)\n",
 273                         (double)offset,(double)count,op,type,strerror(errno)));
 274                 return false;
 275         }
 276
 277         /* everything went OK */
 278         DEBUG(8,("fcntl_lock: Lock call successful\n"));
 279
 280         return true;
 281 }
 282
 283 void print_asc(int level, const uint8_t *buf,int len)
 284 {
 285         int i;
 286         for (i=0;i<len;i++)
 287                 DEBUGADD(level,("%c", isprint(buf[i])?buf[i]:'.'));
 288 }
 289
 290 /**
 291  * Write dump of binary data to the log file.
 292  *
 293  * The data is only written if the log level is at least level.
 294  */
 295 static void _dump_data(int level, const uint8_t *buf, int len,
 296                        bool omit_zero_bytes)
 297 {
 298         int i=0;
 299         const uint8_t empty[16];
 300         bool skipped = false;
 301
 302         if (len<=0) return;
 303
 304         if (!DEBUGLVL(level)) return;
 305
 306         memset(&empty, '\0', 16);
 307
 308         for (i=0;i<len;) {
 309
 310                 if (i%16 == 0) {
 311                         if ((omit_zero_bytes == true) &&
 312                             (i > 0) &&
 313                             (len > i+16) &&
 314                             (memcmp(&buf[i], &empty, 16) == 0))
 315                         {
 316                                 i +=16;
 317                                 continue;
 318                         }
 319
 320                         if (i<len)  {
 321                                 DEBUGADD(level,("[%04X] ",i));
 322                         }
 323                 }
 324
 325                 DEBUGADD(level,("%02X ",(int)buf[i]));
 326                 i++;
 327                 if (i%8 == 0) DEBUGADD(level,("  "));
 328                 if (i%16 == 0) {
 329
 330                         print_asc(level,&buf[i-16],8); DEBUGADD(level,(" "));
 331                         print_asc(level,&buf[i-8],8); DEBUGADD(level,("\n"));
 332
 333                         if ((omit_zero_bytes == true) &&
 334                             (len > i+16) &&
 335                             (memcmp(&buf[i], &empty, 16) == 0)) {
 336                                 if (!skipped) {
 337                                         DEBUGADD(level,("skipping zero buffer bytes\n"));
 338                                         skipped = true;
 339                                 }
 340                         }
 341                 }
 342         }
 343
 344         if (i%16) {
 345                 int n;
 346                 n = 16 - (i%16);
 347                 DEBUGADD(level,(" "));
 348                 if (n>8) DEBUGADD(level,(" "));
 349                 while (n--) DEBUGADD(level,("   "));
 350                 n = MIN(8,i%16);
 351                 print_asc(level,&buf[i-(i%16)],n); DEBUGADD(level,( " " ));
 352                 n = (i%16) - n;
 353                 if (n>0) print_asc(level,&buf[i-n],n);
 354                 DEBUGADD(level,("\n"));
 355         }
 356
 357 }
 358
 359 /**
 360  * Write dump of binary data to the log file.
 361  *
 362  * The data is only written if the log level is at least level.
 363  */
 364 _PUBLIC_ void dump_data(int level, const uint8_t *buf, int len)
 365 {
 366         _dump_data(level, buf, len, false);
 367 }
 368
 369 /**
 370  * Write dump of binary data to the log file.
 371  *
 372  * The data is only written if the log level is at least level.
 373  * 16 zero bytes in a row are ommited
 374  */
 375 _PUBLIC_ void dump_data_skip_zeros(int level, const uint8_t *buf, int len)
 376 {
 377         _dump_data(level, buf, len, true);
 378 }
 379
 380
 381 /**
 382  malloc that aborts with smb_panic on fail or zero size.
 383 **/
 384
 385 _PUBLIC_ void *smb_xmalloc(size_t size)
 386 {
 387         void *p;
 388         if (size == 0)
 389                 smb_panic("smb_xmalloc: called with zero size.\n");
 390         if ((p = malloc(size)) == NULL)
 391                 smb_panic("smb_xmalloc: malloc fail.\n");
 392         return p;
 393 }
 394
 395 /**
 396  Memdup with smb_panic on fail.
 397 **/
 398
 399 _PUBLIC_ void *smb_xmemdup(const void *p, size_t size)
 400 {
 401         void *p2;
 402         p2 = smb_xmalloc(size);
 403         memcpy(p2, p, size);
 404         return p2;
 405 }
 406
 407 /**
 408  strdup that aborts on malloc fail.
 409 **/
 410
 411 char *smb_xstrdup(const char *s)
 412 {
 413 #if defined(PARANOID_MALLOC_CHECKER)
 414 #ifdef strdup
 415 #undef strdup
 416 #endif
 417 #endif
 418
 419 #ifndef HAVE_STRDUP
 420 #define strdup rep_strdup
 421 #endif
 422
 423         char *s1 = strdup(s);
 424 #if defined(PARANOID_MALLOC_CHECKER)
 425 #ifdef strdup
 426 #undef strdup
 427 #endif
 428 #define strdup(s) __ERROR_DONT_USE_STRDUP_DIRECTLY
 429 #endif
 430         if (!s1) {
 431                 smb_panic("smb_xstrdup: malloc failed");
 432         }
 433         return s1;
 434
 435 }
 436
 437 /**
 438  strndup that aborts on malloc fail.
 439 **/
 440
 441 char *smb_xstrndup(const char *s, size_t n)
 442 {
 443 #if defined(PARANOID_MALLOC_CHECKER)
 444 #ifdef strndup
 445 #undef strndup
 446 #endif
 447 #endif
 448
 449 #if (defined(BROKEN_STRNDUP) || !defined(HAVE_STRNDUP))
 450 #undef HAVE_STRNDUP
 451 #define strndup rep_strndup
 452 #endif
 453
 454         char *s1 = strndup(s, n);
 455 #if defined(PARANOID_MALLOC_CHECKER)
 456 #ifdef strndup
 457 #undef strndup
 458 #endif
 459 #define strndup(s,n) __ERROR_DONT_USE_STRNDUP_DIRECTLY
 460 #endif
 461         if (!s1) {
 462                 smb_panic("smb_xstrndup: malloc failed");
 463         }
 464         return s1;
 465 }
 466
 467
 468
 469 /**
 470  Like strdup but for memory.
 471 **/
 472
 473 _PUBLIC_ void *memdup(const void *p, size_t size)
 474 {
 475         void *p2;
 476         if (size == 0)
 477                 return NULL;
 478         p2 = malloc(size);
 479         if (!p2)
 480                 return NULL;
 481         memcpy(p2, p, size);
 482         return p2;
 483 }
 484
 485 /**
 486  * Write a password to the log file.
 487  *
 488  * @note Only actually does something if DEBUG_PASSWORD was defined during
 489  * compile-time.
 490  */
 491 _PUBLIC_ void dump_data_pw(const char *msg, const uint8_t * data, size_t len)
 492 {
 493 #ifdef DEBUG_PASSWORD
 494         DEBUG(11, ("%s", msg));
 495         if (data != NULL && len > 0)
 496         {
 497                 dump_data(11, data, len);
 498         }
 499 #endif
 500 }
 501
 502
 503 /**
 504  * see if a range of memory is all zero. A NULL pointer is considered
 505  * to be all zero
 506  */
 507 _PUBLIC_ bool all_zero(const uint8_t *ptr, size_t size)
 508 {
 509         int i;
 510         if (!ptr) return true;
 511         for (i=0;i<size;i++) {
 512                 if (ptr[i]) return false;
 513         }
 514         return true;
 515 }
 516
 517 /**
 518   realloc an array, checking for integer overflow in the array size
 519 */
 520 _PUBLIC_ void *realloc_array(void *ptr, size_t el_size, unsigned count, bool free_on_fail)
 521 {
 522 #define MAX_MALLOC_SIZE 0x7fffffff
 523         if (count == 0 ||
 524             count >= MAX_MALLOC_SIZE/el_size) {
 525                 if (free_on_fail)
 526                         SAFE_FREE(ptr);
 527                 return NULL;
 528         }
 529         if (!ptr) {
 530                 return malloc(el_size * count);
 531         }
 532         return realloc(ptr, el_size * count);
 533 }
 534
 535 /****************************************************************************
 536  Type-safe malloc.
 537 ****************************************************************************/
 538
 539 void *malloc_array(size_t el_size, unsigned int count)
 540 {
 541         return realloc_array(NULL, el_size, count, false);
 542 }
 543
 544 /**
 545  Trim the specified elements off the front and back of a string.
 546 **/
 547 _PUBLIC_ bool trim_string(char *s, const char *front, const char *back)
 548 {
 549         bool ret = false;
 550         size_t front_len;
 551         size_t back_len;
 552         size_t len;
 553
 554         /* Ignore null or empty strings. */
 555         if (!s || (s[0] == '\0'))
 556                 return false;
 557
 558         front_len       = front? strlen(front) : 0;
 559         back_len        = back? strlen(back) : 0;
 560
 561         len = strlen(s);
 562
 563         if (front_len) {
 564                 while (len && strncmp(s, front, front_len)==0) {
 565                         /* Must use memmove here as src & dest can
 566                          * easily overlap. Found by valgrind. JRA. */
 567                         memmove(s, s+front_len, (len-front_len)+1);
 568                         len -= front_len;
 569                         ret=true;
 570                 }
 571         }
 572
 573         if (back_len) {
 574                 while ((len >= back_len) && strncmp(s+len-back_len,back,back_len)==0) {
 575                         s[len-back_len]='\0';
 576                         len -= back_len;
 577                         ret=true;
 578                 }
 579         }
 580         return ret;
 581 }
 582
 583 /**
 584  Find the number of 'c' chars in a string
 585 **/
 586 _PUBLIC_ _PURE_ size_t count_chars(const char *s, char c)
 587 {
 588         size_t count = 0;
 589
 590         while (*s) {
 591                 if (*s == c) count++;
 592                 s ++;
 593         }
 594
 595         return count;
 596 }
 597
 598 /**
 599  Routine to get hex characters and turn them into a 16 byte array.
 600  the array can be variable length, and any non-hex-numeric
 601  characters are skipped.  "0xnn" or "0Xnn" is specially catered
 602  for.
 603
 604  valid examples: "0A5D15"; "0x15, 0x49, 0xa2"; "59\ta9\te3\n"
 605
 606
 607 **/
 608 _PUBLIC_ size_t strhex_to_str(char *p, size_t p_len, const char *strhex, size_t strhex_len)
 609 {
 610         size_t i;
 611         size_t num_chars = 0;
 612         uint8_t   lonybble, hinybble;
 613         const char     *hexchars = "0123456789ABCDEF";
 614         char           *p1 = NULL, *p2 = NULL;
 615
 616         for (i = 0; i < strhex_len && strhex[i] != 0; i++) {
 617                 if (strncasecmp(hexchars, "0x", 2) == 0) {
 618                         i++; /* skip two chars */
 619                         continue;
 620                 }
 621
 622                 if (!(p1 = strchr(hexchars, toupper((unsigned char)strhex[i]))))
 623                         break;
 624
 625                 i++; /* next hex digit */
 626
 627                 if (!(p2 = strchr(hexchars, toupper((unsigned char)strhex[i]))))
 628                         break;
 629
 630                 /* get the two nybbles */
 631                 hinybble = PTR_DIFF(p1, hexchars);
 632                 lonybble = PTR_DIFF(p2, hexchars);
 633
 634                 if (num_chars >= p_len) {
 635                         break;
 636                 }
 637
 638                 p[num_chars] = (hinybble << 4) | lonybble;
 639                 num_chars++;
 640
 641                 p1 = NULL;
 642                 p2 = NULL;
 643         }
 644         return num_chars;
 645 }
 646
 647 /**
 648  * Parse a hex string and return a data blob.
 649  */
 650 _PUBLIC_ _PURE_ DATA_BLOB strhex_to_data_blob(TALLOC_CTX *mem_ctx, const char *strhex)
 651 {
 652         DATA_BLOB ret_blob = data_blob_talloc(mem_ctx, NULL, strlen(strhex)/2+1);
 653
 654         ret_blob.length = strhex_to_str((char *)ret_blob.data, ret_blob.length,
 655                                         strhex,
 656                                         strlen(strhex));
 657
 658         return ret_blob;
 659 }
 660
 661
 662 /**
 663  * Routine to print a buffer as HEX digits, into an allocated string.
 664  */
 665 _PUBLIC_ void hex_encode(const unsigned char *buff_in, size_t len, char **out_hex_buffer)
 666 {
 667         int i;
 668         char *hex_buffer;
 669
 670         *out_hex_buffer = malloc_array_p(char, (len*2)+1);
 671         hex_buffer = *out_hex_buffer;
 672
 673         for (i = 0; i < len; i++)
 674                 slprintf(&hex_buffer[i*2], 3, "%02X", buff_in[i]);
 675 }
 676
 677 /**
 678  * talloc version of hex_encode()
 679  */
 680 _PUBLIC_ char *hex_encode_talloc(TALLOC_CTX *mem_ctx, const unsigned char *buff_in, size_t len)
 681 {
 682         int i;
 683         char *hex_buffer;
 684
 685         hex_buffer = talloc_array(mem_ctx, char, (len*2)+1);
 686         if (!hex_buffer) {
 687                 return NULL;
 688         }
 689
 690         for (i = 0; i < len; i++)
 691                 slprintf(&hex_buffer[i*2], 3, "%02X", buff_in[i]);
 692
 693         talloc_set_name_const(hex_buffer, hex_buffer);
 694         return hex_buffer;
 695 }
 696
 697 /**
 698  Unescape a URL encoded string, in place.
 699 **/
 700
 701 _PUBLIC_ void rfc1738_unescape(char *buf)
 702 {
 703         char *p=buf;
 704
 705         while ((p=strchr(p,'+')))
 706                 *p = ' ';
 707
 708         p = buf;
 709
 710         while (p && *p && (p=strchr(p,'%'))) {
 711                 int c1 = p[1];
 712                 int c2 = p[2];
 713
 714                 if (c1 >= '0' && c1 <= '9')
 715                         c1 = c1 - '0';
 716                 else if (c1 >= 'A' && c1 <= 'F')
 717                         c1 = 10 + c1 - 'A';
 718                 else if (c1 >= 'a' && c1 <= 'f')
 719                         c1 = 10 + c1 - 'a';
 720                 else {p++; continue;}
 721
 722                 if (c2 >= '0' && c2 <= '9')
 723                         c2 = c2 - '0';
 724                 else if (c2 >= 'A' && c2 <= 'F')
 725                         c2 = 10 + c2 - 'A';
 726                 else if (c2 >= 'a' && c2 <= 'f')
 727                         c2 = 10 + c2 - 'a';
 728                 else {p++; continue;}
 729
 730                 *p = (c1<<4) | c2;
 731
 732                 memmove(p+1, p+3, strlen(p+3)+1);
 733                 p++;
 734         }
 735 }
 736
 737 /**
 738   varient of strcmp() that handles NULL ptrs
 739 **/
 740 _PUBLIC_ int strcmp_safe(const char *s1, const char *s2)
 741 {
 742         if (s1 == s2) {
 743                 return 0;
 744         }
 745         if (s1 == NULL || s2 == NULL) {
 746                 return s1?-1:1;
 747         }
 748         return strcmp(s1, s2);
 749 }
 750
 751
 752 /**
 753 return the number of bytes occupied by a buffer in ASCII format
 754 the result includes the null termination
 755 limited by 'n' bytes
 756 **/
 757 _PUBLIC_ size_t ascii_len_n(const char *src, size_t n)
 758 {
 759         size_t len;
 760
 761         len = strnlen(src, n);
 762         if (len+1 <= n) {
 763                 len += 1;
 764         }
 765
 766         return len;
 767 }
 768
 769 /**
 770  Set a boolean variable from the text value stored in the passed string.
 771  Returns true in success, false if the passed string does not correctly
 772  represent a boolean.
 773 **/
 774
 775 _PUBLIC_ bool set_boolean(const char *boolean_string, bool *boolean)
 776 {
 777         if (strwicmp(boolean_string, "yes") == 0 ||
 778             strwicmp(boolean_string, "true") == 0 ||
 779             strwicmp(boolean_string, "on") == 0 ||
 780             strwicmp(boolean_string, "1") == 0) {
 781                 *boolean = true;
 782                 return true;
 783         } else if (strwicmp(boolean_string, "no") == 0 ||
 784                    strwicmp(boolean_string, "false") == 0 ||
 785                    strwicmp(boolean_string, "off") == 0 ||
 786                    strwicmp(boolean_string, "0") == 0) {
 787                 *boolean = false;
 788                 return true;
 789         }
 790         return false;
 791 }
 792
 793 /**
 794 return the number of bytes occupied by a buffer in CH_UTF16 format
 795 the result includes the null termination
 796 **/
 797 _PUBLIC_ size_t utf16_len(const void *buf)
 798 {
 799         size_t len;
 800
 801         for (len = 0; SVAL(buf,len); len += 2) ;
 802
 803         return len + 2;
 804 }
 805
 806 /**
 807 return the number of bytes occupied by a buffer in CH_UTF16 format
 808 the result includes the null termination
 809 limited by 'n' bytes
 810 **/
 811 _PUBLIC_ size_t utf16_len_n(const void *src, size_t n)
 812 {
 813         size_t len;
 814
 815         for (len = 0; (len+2 < n) && SVAL(src, len); len += 2) ;
 816
 817         if (len+2 <= n) {
 818                 len += 2;
 819         }
 820
 821         return len;
 822 }
 823
 824 /**
 825  * @file
 826  * @brief String utilities.
 827  **/
 828
 829 static bool next_token_internal_talloc(TALLOC_CTX *ctx,
 830                                 const char **ptr,
 831                                 char **pp_buff,
 832                                 const char *sep,
 833                                 bool ltrim)
 834 {
 835         char *s;
 836         char *saved_s;
 837         char *pbuf;
 838         bool quoted;
 839         size_t len=1;
 840
 841         *pp_buff = NULL;
 842         if (!ptr) {
 843                 return(false);
 844         }
 845
 846         s = (char *)*ptr;
 847
 848         /* default to simple separators */
 849         if (!sep) {
 850                 sep = " \t\n\r";
 851         }
 852
 853         /* find the first non sep char, if left-trimming is requested */
 854         if (ltrim) {
 855                 while (*s && strchr_m(sep,*s)) {
 856                         s++;
 857                 }
 858         }
 859
 860         /* nothing left? */
 861         if (!*s) {
 862                 return false;
 863         }
 864
 865         /* When restarting we need to go from here. */
 866         saved_s = s;
 867
 868         /* Work out the length needed. */
 869         for (quoted = false; *s &&
 870                         (quoted || !strchr_m(sep,*s)); s++) {
 871                 if (*s == '\"') {
 872                         quoted = !quoted;
 873                 } else {
 874                         len++;
 875                 }
 876         }
 877
 878         /* We started with len = 1 so we have space for the nul. */
 879         *pp_buff = talloc_array(ctx, char, len);
 880         if (!*pp_buff) {
 881                 return false;
 882         }
 883
 884         /* copy over the token */
 885         pbuf = *pp_buff;
 886         s = saved_s;
 887         for (quoted = false; *s &&
 888                         (quoted || !strchr_m(sep,*s)); s++) {
 889                 if ( *s == '\"' ) {
 890                         quoted = !quoted;
 891                 } else {
 892                         *pbuf++ = *s;
 893                 }
 894         }
 895
 896         *ptr = (*s) ? s+1 : s;
 897         *pbuf = 0;
 898
 899         return true;
 900 }
 901
 902 bool next_token_talloc(TALLOC_CTX *ctx,
 903                         const char **ptr,
 904                         char **pp_buff,
 905                         const char *sep)
 906 {
 907         return next_token_internal_talloc(ctx, ptr, pp_buff, sep, true);
 908 }
 909
 910 /*
 911  * Get the next token from a string, return false if none found.  Handles
 912  * double-quotes.  This version does not trim leading separator characters
 913  * before looking for a token.
 914  */
 915
 916 bool next_token_no_ltrim_talloc(TALLOC_CTX *ctx,
 917                         const char **ptr,
 918                         char **pp_buff,
 919                         const char *sep)
 920 {
 921         return next_token_internal_talloc(ctx, ptr, pp_buff, sep, false);
 922 }
 923
 924