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 2001-2011
   7    Copyright (C) Jim McDonough (jmcd@us.ibm.com)  2003.
   8    Copyright (C) James J Myers 2003
   9    Copyright (C) Volker Lendecke 2010
  10
  11    This program is free software; you can redistribute it and/or modify
  12    it under the terms of the GNU General Public License as published by
  13    the Free Software Foundation; either version 3 of the License, or
  14    (at your option) any later version.
  15
  16    This program is distributed in the hope that it will be useful,
  17    but WITHOUT ANY WARRANTY; without even the implied warranty of
  18    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19    GNU General Public License for more details.
  20
  21    You should have received a copy of the GNU General Public License
  22    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  23 */
  24
  25 #include "includes.h"
  26 #include "system/network.h"
  27 #include "system/filesys.h"
  28 #include "system/locale.h"
  29 #include "system/shmem.h"
  30 #include "system/passwd.h"
  31
  32 #undef malloc
  33 #undef strcasecmp
  34 #undef strncasecmp
  35 #undef strdup
  36 #undef realloc
  37
  38 /**
  39  * @file
  40  * @brief Misc utility functions
  41  */
  42
  43 /**
  44  Find a suitable temporary directory. The result should be copied immediately
  45  as it may be overwritten by a subsequent call.
  46 **/
  47 _PUBLIC_ const char *tmpdir(void)
  48 {
  49         char *p;
  50         if ((p = getenv("TMPDIR")))
  51                 return p;
  52         return "/tmp";
  53 }
  54
  55
  56 /**
  57  Create a tmp file, open it and immediately unlink it.
  58  If dir is NULL uses tmpdir()
  59  Returns the file descriptor or -1 on error.
  60 **/
  61 int create_unlink_tmp(const char *dir)
  62 {
  63         char *fname;
  64         int fd;
  65
  66         if (!dir) {
  67                 dir = tmpdir();
  68         }
  69
  70         fname = talloc_asprintf(talloc_tos(), "%s/listenerlock_XXXXXX", dir);
  71         if (fname == NULL) {
  72                 errno = ENOMEM;
  73                 return -1;
  74         }
  75         fd = mkstemp(fname);
  76         if (fd == -1) {
  77                 TALLOC_FREE(fname);
  78                 return -1;
  79         }
  80         if (unlink(fname) == -1) {
  81                 int sys_errno = errno;
  82                 close(fd);
  83                 TALLOC_FREE(fname);
  84                 errno = sys_errno;
  85                 return -1;
  86         }
  87         TALLOC_FREE(fname);
  88         return fd;
  89 }
  90
  91
  92 /**
  93  Check if a file exists - call vfs_file_exist for samba files.
  94 **/
  95 _PUBLIC_ bool file_exist(const char *fname)
  96 {
  97         struct stat st;
  98
  99         if (stat(fname, &st) != 0) {
 100                 return false;
 101         }
 102
 103         return ((S_ISREG(st.st_mode)) || (S_ISFIFO(st.st_mode)));
 104 }
 105
 106 /**
 107  Check a files mod time.
 108 **/
 109
 110 _PUBLIC_ time_t file_modtime(const char *fname)
 111 {
 112         struct stat st;
 113
 114         if (stat(fname,&st) != 0)
 115                 return(0);
 116
 117         return(st.st_mtime);
 118 }
 119
 120 /**
 121  Check if a directory exists.
 122 **/
 123
 124 _PUBLIC_ bool directory_exist(const char *dname)
 125 {
 126         struct stat st;
 127         bool ret;
 128
 129         if (stat(dname,&st) != 0) {
 130                 return false;
 131         }
 132
 133         ret = S_ISDIR(st.st_mode);
 134         if(!ret)
 135                 errno = ENOTDIR;
 136         return ret;
 137 }
 138
 139 /**
 140  * Try to create the specified directory if it didn't exist.
 141  *
 142  * @retval true if the directory already existed and has the right permissions
 143  * or was successfully created.
 144  */
 145 _PUBLIC_ bool directory_create_or_exist(const char *dname, uid_t uid,
 146                                mode_t dir_perms)
 147 {
 148         int ret;
 149         struct stat st;
 150
 151         ret = lstat(dname, &st);
 152         if (ret == -1) {
 153                 mode_t old_umask;
 154
 155                 if (errno != ENOENT) {
 156                         DEBUG(0, ("lstat failed on directory %s: %s\n",
 157                                   dname, strerror(errno)));
 158                         return false;
 159                 }
 160
 161                 /* Create directory */
 162                 old_umask = umask(0);
 163                 ret = mkdir(dname, dir_perms);
 164                 if (ret == -1 && errno != EEXIST) {
 165                         DEBUG(0, ("mkdir failed on directory "
 166                                   "%s: %s\n", dname,
 167                                   strerror(errno)));
 168                         umask(old_umask);
 169                         return false;
 170                 }
 171                 umask(old_umask);
 172
 173                 ret = lstat(dname, &st);
 174                 if (ret == -1) {
 175                         DEBUG(0, ("lstat failed on created directory %s: %s\n",
 176                                   dname, strerror(errno)));
 177                         return false;
 178                 }
 179         }
 180
 181         /* Check ownership and permission on existing directory */
 182         if (!S_ISDIR(st.st_mode)) {
 183                 DEBUG(0, ("directory %s isn't a directory\n",
 184                         dname));
 185                 return false;
 186         }
 187         if (st.st_uid != uid && !uwrap_enabled()) {
 188                 DEBUG(0, ("invalid ownership on directory "
 189                           "%s\n", dname));
 190                 return false;
 191         }
 192         if ((st.st_mode & 0777) != dir_perms) {
 193                 DEBUG(0, ("invalid permissions on directory "
 194                           "'%s': has 0%o should be 0%o\n", dname,
 195                           (st.st_mode & 0777), dir_perms));
 196                 return false;
 197         }
 198
 199         return true;
 200 }
 201
 202
 203 /**
 204  Sleep for a specified number of milliseconds.
 205 **/
 206
 207 _PUBLIC_ void smb_msleep(unsigned int t)
 208 {
 209 #if defined(HAVE_NANOSLEEP)
 210         struct timespec ts;
 211         int ret;
 212
 213         ts.tv_sec = t/1000;
 214         ts.tv_nsec = 1000000*(t%1000);
 215
 216         do {
 217                 errno = 0;
 218                 ret = nanosleep(&ts, &ts);
 219         } while (ret < 0 && errno == EINTR && (ts.tv_sec > 0 || ts.tv_nsec > 0));
 220 #else
 221         unsigned int tdiff=0;
 222         struct timeval tval,t1,t2;
 223         fd_set fds;
 224
 225         GetTimeOfDay(&t1);
 226         t2 = t1;
 227
 228         while (tdiff < t) {
 229                 tval.tv_sec = (t-tdiff)/1000;
 230                 tval.tv_usec = 1000*((t-tdiff)%1000);
 231
 232                 /* Never wait for more than 1 sec. */
 233                 if (tval.tv_sec > 1) {
 234                         tval.tv_sec = 1;
 235                         tval.tv_usec = 0;
 236                 }
 237
 238                 FD_ZERO(&fds);
 239                 errno = 0;
 240                 select(0,&fds,NULL,NULL,&tval);
 241
 242                 GetTimeOfDay(&t2);
 243                 if (t2.tv_sec < t1.tv_sec) {
 244                         /* Someone adjusted time... */
 245                         t1 = t2;
 246                 }
 247
 248                 tdiff = usec_time_diff(&t2,&t1)/1000;
 249         }
 250 #endif
 251 }
 252
 253 /**
 254  Get my own name, return in talloc'ed storage.
 255 **/
 256
 257 _PUBLIC_ char *get_myname(TALLOC_CTX *ctx)
 258 {
 259         char *p;
 260         char hostname[HOST_NAME_MAX];
 261
 262         /* get my host name */
 263         if (gethostname(hostname, sizeof(hostname)) == -1) {
 264                 DEBUG(0,("gethostname failed\n"));
 265                 return NULL;
 266         }
 267
 268         /* Ensure null termination. */
 269         hostname[sizeof(hostname)-1] = '\0';
 270
 271         /* split off any parts after an initial . */
 272         p = strchr_m(hostname, '.');
 273         if (p) {
 274                 *p = 0;
 275         }
 276
 277         return talloc_strdup(ctx, hostname);
 278 }
 279
 280 /**
 281  Check if a process exists. Does this work on all unixes?
 282 **/
 283
 284 _PUBLIC_ bool process_exists_by_pid(pid_t pid)
 285 {
 286         /* Doing kill with a non-positive pid causes messages to be
 287          * sent to places we don't want. */
 288         SMB_ASSERT(pid > 0);
 289         return(kill(pid,0) == 0 || errno != ESRCH);
 290 }
 291
 292 /**
 293  Simple routine to do POSIX file locking. Cruft in NFS and 64->32 bit mapping
 294  is dealt with in posix.c
 295 **/
 296
 297 _PUBLIC_ bool fcntl_lock(int fd, int op, off_t offset, off_t count, int type)
 298 {
 299         struct flock lock;
 300         int ret;
 301
 302         DEBUG(8,("fcntl_lock %d %d %.0f %.0f %d\n",fd,op,(double)offset,(double)count,type));
 303
 304         lock.l_type = type;
 305         lock.l_whence = SEEK_SET;
 306         lock.l_start = offset;
 307         lock.l_len = count;
 308         lock.l_pid = 0;
 309
 310         ret = fcntl(fd,op,&lock);
 311
 312         if (ret == -1 && errno != 0)
 313                 DEBUG(3,("fcntl_lock: fcntl lock gave errno %d (%s)\n",errno,strerror(errno)));
 314
 315         /* a lock query */
 316         if (op == F_GETLK) {
 317                 if ((ret != -1) &&
 318                                 (lock.l_type != F_UNLCK) &&
 319                                 (lock.l_pid != 0) &&
 320                                 (lock.l_pid != getpid())) {
 321                         DEBUG(3,("fcntl_lock: fd %d is locked by pid %d\n",fd,(int)lock.l_pid));
 322                         return true;
 323                 }
 324
 325                 /* it must be not locked or locked by me */
 326                 return false;
 327         }
 328
 329         /* a lock set or unset */
 330         if (ret == -1) {
 331                 DEBUG(3,("fcntl_lock: lock failed at offset %.0f count %.0f op %d type %d (%s)\n",
 332                         (double)offset,(double)count,op,type,strerror(errno)));
 333                 return false;
 334         }
 335
 336         /* everything went OK */
 337         DEBUG(8,("fcntl_lock: Lock call successful\n"));
 338
 339         return true;
 340 }
 341
 342 static void debugadd_cb(const char *buf, void *private_data)
 343 {
 344         int *plevel = (int *)private_data;
 345         DEBUGADD(*plevel, ("%s", buf));
 346 }
 347
 348 void print_asc_cb(const uint8_t *buf, int len,
 349                   void (*cb)(const char *buf, void *private_data),
 350                   void *private_data)
 351 {
 352         int i;
 353         char s[2];
 354         s[1] = 0;
 355
 356         for (i=0; i<len; i++) {
 357                 s[0] = isprint(buf[i]) ? buf[i] : '.';
 358                 cb(s, private_data);
 359         }
 360 }
 361
 362 void print_asc(int level, const uint8_t *buf,int len)
 363 {
 364         print_asc_cb(buf, len, debugadd_cb, &level);
 365 }
 366
 367 /**
 368  * Write dump of binary data to a callback
 369  */
 370 void dump_data_cb(const uint8_t *buf, int len,
 371                   bool omit_zero_bytes,
 372                   void (*cb)(const char *buf, void *private_data),
 373                   void *private_data)
 374 {
 375         int i=0;
 376         static const uint8_t empty[16] = { 0, };
 377         bool skipped = false;
 378         char tmp[16];
 379
 380         if (len<=0) return;
 381
 382         for (i=0;i<len;) {
 383
 384                 if (i%16 == 0) {
 385                         if ((omit_zero_bytes == true) &&
 386                             (i > 0) &&
 387                             (len > i+16) &&
 388                             (memcmp(&buf[i], &empty, 16) == 0))
 389                         {
 390                                 i +=16;
 391                                 continue;
 392                         }
 393
 394                         if (i<len)  {
 395                                 snprintf(tmp, sizeof(tmp), "[%04X] ", i);
 396                                 cb(tmp, private_data);
 397                         }
 398                 }
 399
 400                 snprintf(tmp, sizeof(tmp), "%02X ", (int)buf[i]);
 401                 cb(tmp, private_data);
 402                 i++;
 403                 if (i%8 == 0) {
 404                         cb("  ", private_data);
 405                 }
 406                 if (i%16 == 0) {
 407
 408                         print_asc_cb(&buf[i-16], 8, cb, private_data);
 409                         cb(" ", private_data);
 410                         print_asc_cb(&buf[i-8], 8, cb, private_data);
 411                         cb("\n", private_data);
 412
 413                         if ((omit_zero_bytes == true) &&
 414                             (len > i+16) &&
 415                             (memcmp(&buf[i], &empty, 16) == 0)) {
 416                                 if (!skipped) {
 417                                         cb("skipping zero buffer bytes\n",
 418                                            private_data);
 419                                         skipped = true;
 420                                 }
 421                         }
 422                 }
 423         }
 424
 425         if (i%16) {
 426                 int n;
 427                 n = 16 - (i%16);
 428                 cb(" ", private_data);
 429                 if (n>8) {
 430                         cb(" ", private_data);
 431                 }
 432                 while (n--) {
 433                         cb("   ", private_data);
 434                 }
 435                 n = MIN(8,i%16);
 436                 print_asc_cb(&buf[i-(i%16)], n, cb, private_data);
 437                 cb(" ", private_data);
 438                 n = (i%16) - n;
 439                 if (n>0) {
 440                         print_asc_cb(&buf[i-n], n, cb, private_data);
 441                 }
 442                 cb("\n", private_data);
 443         }
 444
 445 }
 446
 447 /**
 448  * Write dump of binary data to the log file.
 449  *
 450  * The data is only written if the log level is at least level.
 451  */
 452 _PUBLIC_ void dump_data(int level, const uint8_t *buf, int len)
 453 {
 454         if (!DEBUGLVL(level)) {
 455                 return;
 456         }
 457         dump_data_cb(buf, len, false, debugadd_cb, &level);
 458 }
 459
 460 /**
 461  * Write dump of binary data to the log file.
 462  *
 463  * The data is only written if the log level is at least level.
 464  * 16 zero bytes in a row are omitted
 465  */
 466 _PUBLIC_ void dump_data_skip_zeros(int level, const uint8_t *buf, int len)
 467 {
 468         if (!DEBUGLVL(level)) {
 469                 return;
 470         }
 471         dump_data_cb(buf, len, true, debugadd_cb, &level);
 472 }
 473
 474 static void fprintf_cb(const char *buf, void *private_data)
 475 {
 476         FILE *f = (FILE *)private_data;
 477         fprintf(f, "%s", buf);
 478 }
 479
 480 void dump_data_file(const uint8_t *buf, int len, bool omit_zero_bytes,
 481                     FILE *f)
 482 {
 483         dump_data_cb(buf, len, omit_zero_bytes, fprintf_cb, f);
 484 }
 485
 486 /**
 487  malloc that aborts with smb_panic on fail or zero size.
 488 **/
 489
 490 _PUBLIC_ void *smb_xmalloc(size_t size)
 491 {
 492         void *p;
 493         if (size == 0)
 494                 smb_panic("smb_xmalloc: called with zero size.\n");
 495         if ((p = malloc(size)) == NULL)
 496                 smb_panic("smb_xmalloc: malloc fail.\n");
 497         return p;
 498 }
 499
 500 /**
 501  Memdup with smb_panic on fail.
 502 **/
 503
 504 _PUBLIC_ void *smb_xmemdup(const void *p, size_t size)
 505 {
 506         void *p2;
 507         p2 = smb_xmalloc(size);
 508         memcpy(p2, p, size);
 509         return p2;
 510 }
 511
 512 /**
 513  strdup that aborts on malloc fail.
 514 **/
 515
 516 char *smb_xstrdup(const char *s)
 517 {
 518 #if defined(PARANOID_MALLOC_CHECKER)
 519 #ifdef strdup
 520 #undef strdup
 521 #endif
 522 #endif
 523
 524 #ifndef HAVE_STRDUP
 525 #define strdup rep_strdup
 526 #endif
 527
 528         char *s1 = strdup(s);
 529 #if defined(PARANOID_MALLOC_CHECKER)
 530 #ifdef strdup
 531 #undef strdup
 532 #endif
 533 #define strdup(s) __ERROR_DONT_USE_STRDUP_DIRECTLY
 534 #endif
 535         if (!s1) {
 536                 smb_panic("smb_xstrdup: malloc failed");
 537         }
 538         return s1;
 539
 540 }
 541
 542 /**
 543  strndup that aborts on malloc fail.
 544 **/
 545
 546 char *smb_xstrndup(const char *s, size_t n)
 547 {
 548 #if defined(PARANOID_MALLOC_CHECKER)
 549 #ifdef strndup
 550 #undef strndup
 551 #endif
 552 #endif
 553
 554 #if (defined(BROKEN_STRNDUP) || !defined(HAVE_STRNDUP))
 555 #undef HAVE_STRNDUP
 556 #define strndup rep_strndup
 557 #endif
 558
 559         char *s1 = strndup(s, n);
 560 #if defined(PARANOID_MALLOC_CHECKER)
 561 #ifdef strndup
 562 #undef strndup
 563 #endif
 564 #define strndup(s,n) __ERROR_DONT_USE_STRNDUP_DIRECTLY
 565 #endif
 566         if (!s1) {
 567                 smb_panic("smb_xstrndup: malloc failed");
 568         }
 569         return s1;
 570 }
 571
 572
 573
 574 /**
 575  Like strdup but for memory.
 576 **/
 577
 578 _PUBLIC_ void *memdup(const void *p, size_t size)
 579 {
 580         void *p2;
 581         if (size == 0)
 582                 return NULL;
 583         p2 = malloc(size);
 584         if (!p2)
 585                 return NULL;
 586         memcpy(p2, p, size);
 587         return p2;
 588 }
 589
 590 /**
 591  * Write a password to the log file.
 592  *
 593  * @note Only actually does something if DEBUG_PASSWORD was defined during
 594  * compile-time.
 595  */
 596 _PUBLIC_ void dump_data_pw(const char *msg, const uint8_t * data, size_t len)
 597 {
 598 #ifdef DEBUG_PASSWORD
 599         DEBUG(11, ("%s", msg));
 600         if (data != NULL && len > 0)
 601         {
 602                 dump_data(11, data, len);
 603         }
 604 #endif
 605 }
 606
 607
 608 /**
 609  * see if a range of memory is all zero. A NULL pointer is considered
 610  * to be all zero
 611  */
 612 _PUBLIC_ bool all_zero(const uint8_t *ptr, size_t size)
 613 {
 614         int i;
 615         if (!ptr) return true;
 616         for (i=0;i<size;i++) {
 617                 if (ptr[i]) return false;
 618         }
 619         return true;
 620 }
 621
 622 /**
 623   realloc an array, checking for integer overflow in the array size
 624 */
 625 _PUBLIC_ void *realloc_array(void *ptr, size_t el_size, unsigned count, bool free_on_fail)
 626 {
 627 #define MAX_MALLOC_SIZE 0x7fffffff
 628         if (count == 0 ||
 629             count >= MAX_MALLOC_SIZE/el_size) {
 630                 if (free_on_fail)
 631                         SAFE_FREE(ptr);
 632                 return NULL;
 633         }
 634         if (!ptr) {
 635                 return malloc(el_size * count);
 636         }
 637         return realloc(ptr, el_size * count);
 638 }
 639
 640 /****************************************************************************
 641  Type-safe malloc.
 642 ****************************************************************************/
 643
 644 void *malloc_array(size_t el_size, unsigned int count)
 645 {
 646         return realloc_array(NULL, el_size, count, false);
 647 }
 648
 649 /**
 650  Trim the specified elements off the front and back of a string.
 651 **/
 652 _PUBLIC_ bool trim_string(char *s, const char *front, const char *back)
 653 {
 654         bool ret = false;
 655         size_t front_len;
 656         size_t back_len;
 657         size_t len;
 658
 659         /* Ignore null or empty strings. */
 660         if (!s || (s[0] == '\0'))
 661                 return false;
 662
 663         front_len       = front? strlen(front) : 0;
 664         back_len        = back? strlen(back) : 0;
 665
 666         len = strlen(s);
 667
 668         if (front_len) {
 669                 while (len && strncmp(s, front, front_len)==0) {
 670                         /* Must use memmove here as src & dest can
 671                          * easily overlap. Found by valgrind. JRA. */
 672                         memmove(s, s+front_len, (len-front_len)+1);
 673                         len -= front_len;
 674                         ret=true;
 675                 }
 676         }
 677
 678         if (back_len) {
 679                 while ((len >= back_len) && strncmp(s+len-back_len,back,back_len)==0) {
 680                         s[len-back_len]='\0';
 681                         len -= back_len;
 682                         ret=true;
 683                 }
 684         }
 685         return ret;
 686 }
 687
 688 /**
 689  Find the number of 'c' chars in a string
 690 **/
 691 _PUBLIC_ _PURE_ size_t count_chars(const char *s, char c)
 692 {
 693         size_t count = 0;
 694
 695         while (*s) {
 696                 if (*s == c) count++;
 697                 s ++;
 698         }
 699
 700         return count;
 701 }
 702
 703 /**
 704  * Routine to get hex characters and turn them into a byte array.
 705  * the array can be variable length.
 706  * -  "0xnn" or "0Xnn" is specially catered for.
 707  * - The first non-hex-digit character (apart from possibly leading "0x"
 708  *   finishes the conversion and skips the rest of the input.
 709  * - A single hex-digit character at the end of the string is skipped.
 710  *
 711  * valid examples: "0A5D15"; "0x123456"
 712  */
 713 _PUBLIC_ size_t strhex_to_str(char *p, size_t p_len, const char *strhex, size_t strhex_len)
 714 {
 715         size_t i = 0;
 716         size_t num_chars = 0;
 717         uint8_t   lonybble, hinybble;
 718         const char     *hexchars = "0123456789ABCDEF";
 719         char           *p1 = NULL, *p2 = NULL;
 720
 721         /* skip leading 0x prefix */
 722         if (strncasecmp(strhex, "0x", 2) == 0) {
 723                 i += 2; /* skip two chars */
 724         }
 725
 726         for (; i+1 < strhex_len && strhex[i] != 0 && strhex[i+1] != 0; i++) {
 727                 p1 = strchr(hexchars, toupper((unsigned char)strhex[i]));
 728                 if (p1 == NULL) {
 729                         break;
 730                 }
 731
 732                 i++; /* next hex digit */
 733
 734                 p2 = strchr(hexchars, toupper((unsigned char)strhex[i]));
 735                 if (p2 == NULL) {
 736                         break;
 737                 }
 738
 739                 /* get the two nybbles */
 740                 hinybble = PTR_DIFF(p1, hexchars);
 741                 lonybble = PTR_DIFF(p2, hexchars);
 742
 743                 if (num_chars >= p_len) {
 744                         break;
 745                 }
 746
 747                 p[num_chars] = (hinybble << 4) | lonybble;
 748                 num_chars++;
 749
 750                 p1 = NULL;
 751                 p2 = NULL;
 752         }
 753         return num_chars;
 754 }
 755
 756 /**
 757  * Parse a hex string and return a data blob.
 758  */
 759 _PUBLIC_ _PURE_ DATA_BLOB strhex_to_data_blob(TALLOC_CTX *mem_ctx, const char *strhex)
 760 {
 761         DATA_BLOB ret_blob = data_blob_talloc(mem_ctx, NULL, strlen(strhex)/2+1);
 762
 763         ret_blob.length = strhex_to_str((char *)ret_blob.data, ret_blob.length,
 764                                         strhex,
 765                                         strlen(strhex));
 766
 767         return ret_blob;
 768 }
 769
 770 /**
 771  * Print a buf in hex. Assumes dst is at least (srclen*2)+1 large.
 772  */
 773 _PUBLIC_ void hex_encode_buf(char *dst, const uint8_t *src, size_t srclen)
 774 {
 775         size_t i;
 776         for (i=0; i<srclen; i++) {
 777                 snprintf(dst + i*2, 3, "%02X", src[i]);
 778         }
 779         /*
 780          * Ensure 0-termination for 0-length buffers
 781          */
 782         dst[srclen*2] = '\0';
 783 }
 784
 785 /**
 786  * Routine to print a buffer as HEX digits, into an allocated string.
 787  */
 788 _PUBLIC_ void hex_encode(const unsigned char *buff_in, size_t len, char **out_hex_buffer)
 789 {
 790         char *hex_buffer;
 791
 792         *out_hex_buffer = malloc_array_p(char, (len*2)+1);
 793         hex_buffer = *out_hex_buffer;
 794         hex_encode_buf(hex_buffer, buff_in, len);
 795 }
 796
 797 /**
 798  * talloc version of hex_encode()
 799  */
 800 _PUBLIC_ char *hex_encode_talloc(TALLOC_CTX *mem_ctx, const unsigned char *buff_in, size_t len)
 801 {
 802         char *hex_buffer;
 803
 804         hex_buffer = talloc_array(mem_ctx, char, (len*2)+1);
 805         if (!hex_buffer) {
 806                 return NULL;
 807         }
 808         hex_encode_buf(hex_buffer, buff_in, len);
 809         talloc_set_name_const(hex_buffer, hex_buffer);
 810         return hex_buffer;
 811 }
 812
 813 /**
 814   varient of strcmp() that handles NULL ptrs
 815 **/
 816 _PUBLIC_ int strcmp_safe(const char *s1, const char *s2)
 817 {
 818         if (s1 == s2) {
 819                 return 0;
 820         }
 821         if (s1 == NULL || s2 == NULL) {
 822                 return s1?-1:1;
 823         }
 824         return strcmp(s1, s2);
 825 }
 826
 827
 828 /**
 829 return the number of bytes occupied by a buffer in ASCII format
 830 the result includes the null termination
 831 limited by 'n' bytes
 832 **/
 833 _PUBLIC_ size_t ascii_len_n(const char *src, size_t n)
 834 {
 835         size_t len;
 836
 837         len = strnlen(src, n);
 838         if (len+1 <= n) {
 839                 len += 1;
 840         }
 841
 842         return len;
 843 }
 844
 845 /**
 846  Set a boolean variable from the text value stored in the passed string.
 847  Returns true in success, false if the passed string does not correctly
 848  represent a boolean.
 849 **/
 850
 851 _PUBLIC_ bool set_boolean(const char *boolean_string, bool *boolean)
 852 {
 853         if (strwicmp(boolean_string, "yes") == 0 ||
 854             strwicmp(boolean_string, "true") == 0 ||
 855             strwicmp(boolean_string, "on") == 0 ||
 856             strwicmp(boolean_string, "1") == 0) {
 857                 *boolean = true;
 858                 return true;
 859         } else if (strwicmp(boolean_string, "no") == 0 ||
 860                    strwicmp(boolean_string, "false") == 0 ||
 861                    strwicmp(boolean_string, "off") == 0 ||
 862                    strwicmp(boolean_string, "0") == 0) {
 863                 *boolean = false;
 864                 return true;
 865         }
 866         return false;
 867 }
 868
 869 /**
 870 return the number of bytes occupied by a buffer in CH_UTF16 format
 871 the result includes the null termination
 872 **/
 873 _PUBLIC_ size_t utf16_len(const void *buf)
 874 {
 875         size_t len;
 876
 877         for (len = 0; SVAL(buf,len); len += 2) ;
 878
 879         return len + 2;
 880 }
 881
 882 /**
 883 return the number of bytes occupied by a buffer in CH_UTF16 format
 884 the result includes the null termination
 885 limited by 'n' bytes
 886 **/
 887 _PUBLIC_ size_t utf16_len_n(const void *src, size_t n)
 888 {
 889         size_t len;
 890
 891         for (len = 0; (len+2 < n) && SVAL(src, len); len += 2) ;
 892
 893         if (len+2 <= n) {
 894                 len += 2;
 895         }
 896
 897         return len;
 898 }
 899
 900 /**
 901  * @file
 902  * @brief String utilities.
 903  **/
 904
 905 static bool next_token_internal_talloc(TALLOC_CTX *ctx,
 906                                 const char **ptr,
 907                                 char **pp_buff,
 908                                 const char *sep,
 909                                 bool ltrim)
 910 {
 911         const char *s;
 912         const char *saved_s;
 913         char *pbuf;
 914         bool quoted;
 915         size_t len=1;
 916
 917         *pp_buff = NULL;
 918         if (!ptr) {
 919                 return(false);
 920         }
 921
 922         s = *ptr;
 923
 924         /* default to simple separators */
 925         if (!sep) {
 926                 sep = " \t\n\r";
 927         }
 928
 929         /* find the first non sep char, if left-trimming is requested */
 930         if (ltrim) {
 931                 while (*s && strchr_m(sep,*s)) {
 932                         s++;
 933                 }
 934         }
 935
 936         /* nothing left? */
 937         if (!*s) {
 938                 return false;
 939         }
 940
 941         /* When restarting we need to go from here. */
 942         saved_s = s;
 943
 944         /* Work out the length needed. */
 945         for (quoted = false; *s &&
 946                         (quoted || !strchr_m(sep,*s)); s++) {
 947                 if (*s == '\"') {
 948                         quoted = !quoted;
 949                 } else {
 950                         len++;
 951                 }
 952         }
 953
 954         /* We started with len = 1 so we have space for the nul. */
 955         *pp_buff = talloc_array(ctx, char, len);
 956         if (!*pp_buff) {
 957                 return false;
 958         }
 959
 960         /* copy over the token */
 961         pbuf = *pp_buff;
 962         s = saved_s;
 963         for (quoted = false; *s &&
 964                         (quoted || !strchr_m(sep,*s)); s++) {
 965                 if ( *s == '\"' ) {
 966                         quoted = !quoted;
 967                 } else {
 968                         *pbuf++ = *s;
 969                 }
 970         }
 971
 972         *ptr = (*s) ? s+1 : s;
 973         *pbuf = 0;
 974
 975         return true;
 976 }
 977
 978 bool next_token_talloc(TALLOC_CTX *ctx,
 979                         const char **ptr,
 980                         char **pp_buff,
 981                         const char *sep)
 982 {
 983         return next_token_internal_talloc(ctx, ptr, pp_buff, sep, true);
 984 }
 985
 986 /*
 987  * Get the next token from a string, return false if none found.  Handles
 988  * double-quotes.  This version does not trim leading separator characters
 989  * before looking for a token.
 990  */
 991
 992 bool next_token_no_ltrim_talloc(TALLOC_CTX *ctx,
 993                         const char **ptr,
 994                         char **pp_buff,
 995                         const char *sep)
 996 {
 997         return next_token_internal_talloc(ctx, ptr, pp_buff, sep, false);
 998 }
 999
1000 /**
1001  * Get the next token from a string, return False if none found.
1002  * Handles double-quotes.
1003  *
1004  * Based on a routine by GJC@VILLAGE.COM.
1005  * Extensively modified by Andrew.Tridgell@anu.edu.au
1006  **/
1007 _PUBLIC_ bool next_token(const char **ptr,char *buff, const char *sep, size_t bufsize)
1008 {
1009         const char *s;
1010         bool quoted;
1011         size_t len=1;
1012
1013         if (!ptr)
1014                 return false;
1015
1016         s = *ptr;
1017
1018         /* default to simple separators */
1019         if (!sep)
1020                 sep = " \t\n\r";
1021
1022         /* find the first non sep char */
1023         while (*s && strchr_m(sep,*s))
1024                 s++;
1025
1026         /* nothing left? */
1027         if (!*s)
1028                 return false;
1029
1030         /* copy over the token */
1031         for (quoted = false; len < bufsize && *s && (quoted || !strchr_m(sep,*s)); s++) {
1032                 if (*s == '\"') {
1033                         quoted = !quoted;
1034                 } else {
1035                         len++;
1036                         *buff++ = *s;
1037                 }
1038         }
1039
1040         *ptr = (*s) ? s+1 : s;
1041         *buff = 0;
1042
1043         return true;
1044 }
1045
1046 struct anonymous_shared_header {
1047         union {
1048                 size_t length;
1049                 uint8_t pad[16];
1050         } u;
1051 };
1052
1053 /* Map a shared memory buffer of at least nelem counters. */
1054 void *anonymous_shared_allocate(size_t orig_bufsz)
1055 {
1056         void *ptr;
1057         void *buf;
1058         size_t pagesz = getpagesize();
1059         size_t pagecnt;
1060         size_t bufsz = orig_bufsz;
1061         struct anonymous_shared_header *hdr;
1062
1063         bufsz += sizeof(*hdr);
1064
1065         /* round up to full pages */
1066         pagecnt = bufsz / pagesz;
1067         if (bufsz % pagesz) {
1068                 pagecnt += 1;
1069         }
1070         bufsz = pagesz * pagecnt;
1071
1072         if (orig_bufsz >= bufsz) {
1073                 /* integer wrap */
1074                 errno = ENOMEM;
1075                 return NULL;
1076         }
1077
1078 #ifdef MAP_ANON
1079         /* BSD */
1080         buf = mmap(NULL, bufsz, PROT_READ|PROT_WRITE, MAP_ANON|MAP_SHARED,
1081                         -1 /* fd */, 0 /* offset */);
1082 #else
1083         buf = mmap(NULL, bufsz, PROT_READ|PROT_WRITE, MAP_FILE|MAP_SHARED,
1084                         open("/dev/zero", O_RDWR), 0 /* offset */);
1085 #endif
1086
1087         if (buf == MAP_FAILED) {
1088                 return NULL;
1089         }
1090
1091         hdr = (struct anonymous_shared_header *)buf;
1092         hdr->u.length = bufsz;
1093
1094         ptr = (void *)(&hdr[1]);
1095
1096         return ptr;
1097 }
1098
1099 void *anonymous_shared_resize(void *ptr, size_t new_size, bool maymove)
1100 {
1101 #ifdef HAVE_MREMAP
1102         void *buf;
1103         size_t pagesz = getpagesize();
1104         size_t pagecnt;
1105         size_t bufsz;
1106         struct anonymous_shared_header *hdr;
1107         int flags = 0;
1108
1109         if (ptr == NULL) {
1110                 errno = EINVAL;
1111                 return NULL;
1112         }
1113
1114         hdr = (struct anonymous_shared_header *)ptr;
1115         hdr--;
1116         if (hdr->u.length > (new_size + sizeof(*hdr))) {
1117                 errno = EINVAL;
1118                 return NULL;
1119         }
1120
1121         bufsz = new_size + sizeof(*hdr);
1122
1123         /* round up to full pages */
1124         pagecnt = bufsz / pagesz;
1125         if (bufsz % pagesz) {
1126                 pagecnt += 1;
1127         }
1128         bufsz = pagesz * pagecnt;
1129
1130         if (new_size >= bufsz) {
1131                 /* integer wrap */
1132                 errno = ENOSPC;
1133                 return NULL;
1134         }
1135
1136         if (bufsz <= hdr->u.length) {
1137                 return ptr;
1138         }
1139
1140         if (maymove) {
1141                 flags = MREMAP_MAYMOVE;
1142         }
1143
1144         buf = mremap(hdr, hdr->u.length, bufsz, flags);
1145
1146         if (buf == MAP_FAILED) {
1147                 errno = ENOSPC;
1148                 return NULL;
1149         }
1150
1151         hdr = (struct anonymous_shared_header *)buf;
1152         hdr->u.length = bufsz;
1153
1154         ptr = (void *)(&hdr[1]);
1155
1156         return ptr;
1157 #else
1158         errno = ENOSPC;
1159         return NULL;
1160 #endif
1161 }
1162
1163 void anonymous_shared_free(void *ptr)
1164 {
1165         struct anonymous_shared_header *hdr;
1166
1167         if (ptr == NULL) {
1168                 return;
1169         }
1170
1171         hdr = (struct anonymous_shared_header *)ptr;
1172
1173         hdr--;
1174
1175         munmap(hdr, hdr->u.length);
1176 }
1177
1178 #ifdef DEVELOPER
1179 /* used when you want a debugger started at a particular point in the
1180    code. Mostly useful in code that runs as a child process, where
1181    normal gdb attach is harder to organise.
1182 */
1183 void samba_start_debugger(void)
1184 {
1185         char *cmd = NULL;
1186         if (asprintf(&cmd, "xterm -e \"gdb --pid %u\"&", getpid()) == -1) {
1187                 return;
1188         }
1189         if (system(cmd) == -1) {
1190                 free(cmd);
1191                 return;
1192         }
1193         free(cmd);
1194         sleep(2);
1195 }
1196 #endif