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