source/lib/system.c

   1 /*
   2    Unix SMB/Netbios implementation.
   3    Version 1.9.
   4    Samba system utilities
   5    Copyright (C) Andrew Tridgell 1992-1998
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20 */
  21
  22 #include "includes.h"
  23
  24 extern int DEBUGLEVEL;
  25
  26 /*
  27    The idea is that this file will eventually have wrappers around all
  28    important system calls in samba. The aims are:
  29
  30    - to enable easier porting by putting OS dependent stuff in here
  31
  32    - to allow for hooks into other "pseudo-filesystems"
  33
  34    - to allow easier integration of things like the japanese extensions
  35
  36    - to support the philosophy of Samba to expose the features of
  37      the OS within the SMB model. In general whatever file/printer/variable
  38      expansions/etc make sense to the OS should be acceptable to Samba.
  39 */
  40
  41
  42
  43 /*******************************************************************
  44  A wrapper for usleep in case we don't have one.
  45 ********************************************************************/
  46
  47 int sys_usleep(long usecs)
  48 {
  49 #ifndef HAVE_USLEEP
  50   struct timeval tval;
  51 #endif
  52
  53   /*
  54    * We need this braindamage as the glibc usleep
  55    * is not SPEC1170 complient... grumble... JRA.
  56    */
  57
  58   if(usecs < 0 || usecs > 1000000) {
  59     errno = EINVAL;
  60     return -1;
  61   }
  62
  63 #if HAVE_USLEEP
  64   usleep(usecs);
  65   return 0;
  66 #else /* HAVE_USLEEP */
  67   /*
  68    * Fake it with select...
  69    */
  70   tval.tv_sec = 0;
  71   tval.tv_usec = usecs/1000;
  72   select(0,NULL,NULL,NULL,&tval);
  73   return 0;
  74 #endif /* HAVE_USLEEP */
  75 }
  76
  77 /*******************************************************************
  78 A stat() wrapper that will deal with 64 bit filesizes.
  79 ********************************************************************/
  80
  81 int sys_stat(const char *fname,SMB_STRUCT_STAT *sbuf)
  82 {
  83         int ret;
  84 #if defined(HAVE_EXPLICIT_LARGEFILE_SUPPORT) && defined(HAVE_OFF64_T) && defined(HAVE_STAT64)
  85         ret = stat64(fname, sbuf);
  86 #else
  87         ret = stat(fname, sbuf);
  88 #endif
  89         /* we always want directories to appear zero size */
  90         if (ret == 0 && S_ISDIR(sbuf->st_mode)) sbuf->st_size = 0;
  91         return ret;
  92 }
  93
  94 /*******************************************************************
  95  An fstat() wrapper that will deal with 64 bit filesizes.
  96 ********************************************************************/
  97
  98 int sys_fstat(int fd,SMB_STRUCT_STAT *sbuf)
  99 {
 100         int ret;
 101 #if defined(HAVE_EXPLICIT_LARGEFILE_SUPPORT) && defined(HAVE_OFF64_T) && defined(HAVE_FSTAT64)
 102         ret = fstat64(fd, sbuf);
 103 #else
 104         ret = fstat(fd, sbuf);
 105 #endif
 106         /* we always want directories to appear zero size */
 107         if (ret == 0 && S_ISDIR(sbuf->st_mode)) sbuf->st_size = 0;
 108         return ret;
 109 }
 110
 111 /*******************************************************************
 112  An lstat() wrapper that will deal with 64 bit filesizes.
 113 ********************************************************************/
 114
 115 int sys_lstat(const char *fname,SMB_STRUCT_STAT *sbuf)
 116 {
 117         int ret;
 118 #if defined(HAVE_EXPLICIT_LARGEFILE_SUPPORT) && defined(HAVE_OFF64_T) && defined(HAVE_LSTAT64)
 119         ret = lstat64(fname, sbuf);
 120 #else
 121         ret = lstat(fname, sbuf);
 122 #endif
 123         /* we always want directories to appear zero size */
 124         if (ret == 0 && S_ISDIR(sbuf->st_mode)) sbuf->st_size = 0;
 125         return ret;
 126 }
 127
 128 /*******************************************************************
 129  An ftruncate() wrapper that will deal with 64 bit filesizes.
 130 ********************************************************************/
 131
 132 int sys_ftruncate(int fd, SMB_OFF_T offset)
 133 {
 134 #if defined(HAVE_EXPLICIT_LARGEFILE_SUPPORT) && defined(HAVE_OFF64_T) && defined(HAVE_FTRUNCATE64)
 135   return ftruncate64(fd, offset);
 136 #else
 137   return ftruncate(fd, offset);
 138 #endif
 139 }
 140
 141 /*******************************************************************
 142  An lseek() wrapper that will deal with 64 bit filesizes.
 143 ********************************************************************/
 144
 145 SMB_OFF_T sys_lseek(int fd, SMB_OFF_T offset, int whence)
 146 {
 147 #if defined(HAVE_EXPLICIT_LARGEFILE_SUPPORT) && defined(HAVE_OFF64_T) && defined(HAVE_LSEEK64)
 148   return lseek64(fd, offset, whence);
 149 #else
 150   return lseek(fd, offset, whence);
 151 #endif
 152 }
 153
 154 /*******************************************************************
 155  An fseek() wrapper that will deal with 64 bit filesizes.
 156 ********************************************************************/
 157
 158 int sys_fseek(FILE *fp, SMB_OFF_T offset, int whence)
 159 {
 160 #if defined(HAVE_EXPLICIT_LARGEFILE_SUPPORT) && defined(LARGE_SMB_OFF_T) && defined(HAVE_FSEEK64)
 161   return fseek64(fp, offset, whence);
 162 #elif defined(HAVE_EXPLICIT_LARGEFILE_SUPPORT) && defined(LARGE_SMB_OFF_T) && defined(HAVE_FSEEKO64)
 163   return fseeko64(fp, offset, whence);
 164 #else
 165   return fseek(fp, offset, whence);
 166 #endif
 167 }
 168
 169 /*******************************************************************
 170  An ftell() wrapper that will deal with 64 bit filesizes.
 171 ********************************************************************/
 172
 173 SMB_OFF_T sys_ftell(FILE *fp)
 174 {
 175 #if defined(HAVE_EXPLICIT_LARGEFILE_SUPPORT) && defined(LARGE_SMB_OFF_T) && defined(HAVE_FTELL64)
 176   return (SMB_OFF_T)ftell64(fp);
 177 #elif defined(HAVE_EXPLICIT_LARGEFILE_SUPPORT) && defined(LARGE_SMB_OFF_T) && defined(HAVE_FTELLO64)
 178   return (SMB_OFF_T)ftello64(fp);
 179 #else
 180   return (SMB_OFF_T)ftell(fp);
 181 #endif
 182 }
 183
 184 /*******************************************************************
 185  A creat() wrapper that will deal with 64 bit filesizes.
 186 ********************************************************************/
 187
 188 int sys_creat(const char *path, mode_t mode)
 189 {
 190 #if defined(HAVE_EXPLICIT_LARGEFILE_SUPPORT) && defined(HAVE_CREAT64)
 191   return creat64(path, mode);
 192 #else
 193   /*
 194    * If creat64 isn't defined then ensure we call a potential open64.
 195    * JRA.
 196    */
 197   return sys_open(path, O_WRONLY | O_CREAT | O_TRUNC, mode);
 198 #endif
 199 }
 200
 201 /*******************************************************************
 202  An open() wrapper that will deal with 64 bit filesizes.
 203 ********************************************************************/
 204
 205 int sys_open(const char *path, int oflag, mode_t mode)
 206 {
 207 #if defined(HAVE_EXPLICIT_LARGEFILE_SUPPORT) && defined(HAVE_OPEN64)
 208   return open64(path, oflag, mode);
 209 #else
 210   return open(path, oflag, mode);
 211 #endif
 212 }
 213
 214 /*******************************************************************
 215  An fopen() wrapper that will deal with 64 bit filesizes.
 216 ********************************************************************/
 217
 218 FILE *sys_fopen(const char *path, const char *type)
 219 {
 220 #if defined(HAVE_EXPLICIT_LARGEFILE_SUPPORT) && defined(HAVE_FOPEN64)
 221   return fopen64(path, type);
 222 #else
 223   return fopen(path, type);
 224 #endif
 225 }
 226
 227 /*******************************************************************
 228  A readdir wrapper that will deal with 64 bit filesizes.
 229 ********************************************************************/
 230
 231 SMB_STRUCT_DIRENT *sys_readdir(DIR *dirp)
 232 {
 233 #if defined(HAVE_EXPLICIT_LARGEFILE_SUPPORT) && defined(HAVE_READDIR64)
 234   return readdir64(dirp);
 235 #else
 236   return readdir(dirp);
 237 #endif
 238 }
 239
 240 /*******************************************************************
 241 The wait() calls vary between systems
 242 ********************************************************************/
 243
 244 int sys_waitpid(pid_t pid,int *status,int options)
 245 {
 246 #ifdef HAVE_WAITPID
 247   return waitpid(pid,status,options);
 248 #else /* HAVE_WAITPID */
 249   return wait4(pid, status, options, NULL);
 250 #endif /* HAVE_WAITPID */
 251 }
 252
 253 /*******************************************************************
 254 system wrapper for getwd
 255 ********************************************************************/
 256 char *sys_getwd(char *s)
 257 {
 258     char *wd;
 259 #ifdef HAVE_GETCWD
 260     wd = (char *)getcwd(s, sizeof (pstring));
 261 #else
 262     wd = (char *)getwd(s);
 263 #endif
 264     return wd;
 265 }
 266
 267 /*******************************************************************
 268 chown isn't used much but OS/2 doesn't have it
 269 ********************************************************************/
 270
 271 int sys_chown(const char *fname,uid_t uid,gid_t gid)
 272 {
 273 #ifndef HAVE_CHOWN
 274         static int done;
 275         if (!done) {
 276                 DEBUG(1,("WARNING: no chown!\n"));
 277                 done=1;
 278         }
 279 #else
 280         return(chown(fname,uid,gid));
 281 #endif
 282 }
 283
 284 /*******************************************************************
 285 os/2 also doesn't have chroot
 286 ********************************************************************/
 287 int sys_chroot(const char *dname)
 288 {
 289 #ifndef HAVE_CHROOT
 290         static int done;
 291         if (!done) {
 292                 DEBUG(1,("WARNING: no chroot!\n"));
 293                 done=1;
 294         }
 295         errno = ENOSYS;
 296         return -1;
 297 #else
 298         return(chroot(dname));
 299 #endif
 300 }
 301
 302 /**************************************************************************
 303 A wrapper for gethostbyname() that tries avoids looking up hostnames
 304 in the root domain, which can cause dial-on-demand links to come up for no
 305 apparent reason.
 306 ****************************************************************************/
 307 struct hostent *sys_gethostbyname(const char *name)
 308 {
 309 #ifdef REDUCE_ROOT_DNS_LOOKUPS
 310   char query[256], hostname[256];
 311   char *domain;
 312
 313   /* Does this name have any dots in it? If so, make no change */
 314
 315   if (strchr(name, '.'))
 316     return(gethostbyname(name));
 317
 318   /* Get my hostname, which should have domain name
 319      attached. If not, just do the gethostname on the
 320      original string.
 321   */
 322
 323   gethostname(hostname, sizeof(hostname) - 1);
 324   hostname[sizeof(hostname) - 1] = 0;
 325   if ((domain = strchr(hostname, '.')) == NULL)
 326     return(gethostbyname(name));
 327
 328   /* Attach domain name to query and do modified query.
 329      If names too large, just do gethostname on the
 330      original string.
 331   */
 332
 333   if((strlen(name) + strlen(domain)) >= sizeof(query))
 334     return(gethostbyname(name));
 335
 336   slprintf(query, sizeof(query)-1, "%s%s", name, domain);
 337   return(gethostbyname(query));
 338 #else /* REDUCE_ROOT_DNS_LOOKUPS */
 339   return(gethostbyname(name));
 340 #endif /* REDUCE_ROOT_DNS_LOOKUPS */
 341 }
 342
 343
 344 #if defined(HAVE_IRIX_SPECIFIC_CAPABILITIES)
 345 /**************************************************************************
 346  Try and abstract process capabilities (for systems that have them).
 347 ****************************************************************************/
 348 static BOOL set_process_capability( uint32 cap_flag, BOOL enable )
 349 {
 350   if(cap_flag == KERNEL_OPLOCK_CAPABILITY)
 351   {
 352     cap_t cap = cap_get_proc();
 353
 354     if (cap == NULL) {
 355       DEBUG(0,("set_process_capability: cap_get_proc failed. Error was %s\n",
 356             strerror(errno)));
 357       return False;
 358     }
 359
 360     if(enable)
 361       cap->cap_effective |= CAP_NETWORK_MGT;
 362     else
 363       cap->cap_effective &= ~CAP_NETWORK_MGT;
 364
 365     if (cap_set_proc(cap) == -1) {
 366       DEBUG(0,("set_process_capability: cap_set_proc failed. Error was %s\n",
 367             strerror(errno)));
 368       cap_free(cap);
 369       return False;
 370     }
 371
 372     cap_free(cap);
 373
 374     DEBUG(10,("set_process_capability: Set KERNEL_OPLOCK_CAPABILITY.\n"));
 375   }
 376   return True;
 377 }
 378
 379 /**************************************************************************
 380  Try and abstract inherited process capabilities (for systems that have them).
 381 ****************************************************************************/
 382
 383 static BOOL set_inherited_process_capability( uint32 cap_flag, BOOL enable )
 384 {
 385   if(cap_flag == KERNEL_OPLOCK_CAPABILITY)
 386   {
 387     cap_t cap = cap_get_proc();
 388
 389     if (cap == NULL) {
 390       DEBUG(0,("set_inherited_process_capability: cap_get_proc failed. Error was %s\n",
 391             strerror(errno)));
 392       return False;
 393     }
 394
 395     if(enable)
 396       cap->cap_inheritable |= CAP_NETWORK_MGT;
 397     else
 398       cap->cap_inheritable &= ~CAP_NETWORK_MGT;
 399
 400     if (cap_set_proc(cap) == -1) {
 401       DEBUG(0,("set_inherited_process_capability: cap_set_proc failed. Error was %s\n",
 402             strerror(errno)));
 403       cap_free(cap);
 404       return False;
 405     }
 406
 407     cap_free(cap);
 408
 409     DEBUG(10,("set_inherited_process_capability: Set KERNEL_OPLOCK_CAPABILITY.\n"));
 410   }
 411   return True;
 412 }
 413 #endif
 414
 415 /****************************************************************************
 416 gain the oplock capability from the kernel if possible
 417 ****************************************************************************/
 418 void oplock_set_capability(BOOL this_process, BOOL inherit)
 419 {
 420 #if HAVE_KERNEL_OPLOCKS_IRIX
 421         set_process_capability(KERNEL_OPLOCK_CAPABILITY,this_process);
 422         set_inherited_process_capability(KERNEL_OPLOCK_CAPABILITY,inherit);
 423 #endif
 424 }
 425
 426 /**************************************************************************
 427  Wrapper for random().
 428 ****************************************************************************/
 429
 430 long sys_random(void)
 431 {
 432 #if defined(HAVE_RANDOM)
 433   return (long)random();
 434 #elif defined(HAVE_RAND)
 435   return (long)rand();
 436 #else
 437   DEBUG(0,("Error - no random function available !\n"));
 438   exit(1);
 439 #endif
 440 }
 441
 442 /**************************************************************************
 443  Wrapper for srandom().
 444 ****************************************************************************/
 445
 446 void sys_srandom(unsigned int seed)
 447 {
 448 #if defined(HAVE_SRANDOM)
 449   srandom(seed);
 450 #elif defined(HAVE_SRAND)
 451   srand(seed);
 452 #else
 453   DEBUG(0,("Error - no srandom function available !\n"));
 454   exit(1);
 455 #endif
 456 }
 457
 458 /**************************************************************************
 459  Returns equivalent to NGROUPS_MAX - using sysconf if needed.
 460 ****************************************************************************/
 461
 462 int groups_max(void)
 463 {
 464 #if defined(SYSCONF_SC_NGROUPS_MAX)
 465   int ret = sysconf(_SC_NGROUPS_MAX);
 466   return (ret == -1) ? NGROUPS_MAX : ret;
 467 #else
 468   return NGROUPS_MAX;
 469 #endif
 470 }
 471
 472 /**************************************************************************
 473  Wrapper for getgroups. Deals with broken (int) case.
 474 ****************************************************************************/
 475
 476 int sys_getgroups(int setlen, gid_t *gidset)
 477 {
 478 #if !defined(HAVE_BROKEN_GETGROUPS)
 479   return getgroups(setlen, gidset);
 480 #else
 481
 482   GID_T gid;
 483   GID_T *group_list;
 484   int i, ngroups;
 485
 486   if(setlen == 0) {
 487     return getgroups(setlen, &gid);
 488   }
 489
 490   /*
 491    * Broken case. We need to allocate a
 492    * GID_T array of size setlen.
 493    */
 494
 495   if(setlen < 0) {
 496     errno = EINVAL;
 497     return -1;
 498   }
 499
 500   if (setlen == 0)
 501     setlen = groups_max();
 502
 503   if((group_list = (GID_T *)malloc(setlen * sizeof(GID_T))) == NULL) {
 504     DEBUG(0,("sys_getgroups: Malloc fail.\n"));
 505     return -1;
 506   }
 507
 508   if((ngroups = getgroups(setlen, group_list)) < 0) {
 509     int saved_errno = errno;
 510     free((char *)group_list);
 511     errno = saved_errno;
 512     return -1;
 513   }
 514
 515   for(i = 0; i < ngroups; i++)
 516     gidset[i] = (gid_t)group_list[i];
 517
 518   free((char *)group_list);
 519   return ngroups;
 520 #endif /* HAVE_BROKEN_GETGROUPS */
 521 }
 522
 523 #ifdef HAVE_SETGROUPS
 524
 525 /**************************************************************************
 526  Wrapper for setgroups. Deals with broken (int) case. Automatically used
 527  if we have broken getgroups.
 528 ****************************************************************************/
 529
 530 int sys_setgroups(int setlen, gid_t *gidset)
 531 {
 532 #if !defined(HAVE_BROKEN_GETGROUPS)
 533   return setgroups(setlen, gidset);
 534 #else
 535
 536   GID_T *group_list;
 537   int i ;
 538
 539   if (setlen == 0)
 540     return 0 ;
 541
 542   if (setlen < 0 || setlen > groups_max()) {
 543     errno = EINVAL;
 544     return -1;
 545   }
 546
 547   /*
 548    * Broken case. We need to allocate a
 549    * GID_T array of size setlen.
 550    */
 551
 552   if((group_list = (GID_T *)malloc(setlen * sizeof(GID_T))) == NULL) {
 553     DEBUG(0,("sys_setgroups: Malloc fail.\n"));
 554     return -1;
 555   }
 556
 557   for(i = 0; i < setlen; i++)
 558     group_list[i] = (GID_T) gidset[i];
 559
 560   if(setgroups(setlen, group_list) != 0) {
 561     int saved_errno = errno;
 562     free((char *)group_list);
 563     errno = saved_errno;
 564     return -1;
 565   }
 566
 567   free((char *)group_list);
 568   return 0 ;
 569 #endif /* HAVE_BROKEN_GETGROUPS */
 570 }
 571
 572 #endif /* HAVE_SETGROUPS */
 573
 574 /*
 575  * We only wrap pw_name and pw_passwd for now as these
 576  * are the only potentially modified fields.
 577  */
 578
 579 /**************************************************************************
 580  Helper function for getpwnam/getpwuid wrappers.
 581 ****************************************************************************/
 582
 583 struct saved_pw {
 584         fstring         pw_name;
 585         fstring         pw_passwd;
 586         struct passwd pass;
 587 };
 588
 589 static struct saved_pw pw_mod; /* This is the structure returned - can be modified. */
 590 static struct saved_pw pw_cache; /* This is the structure saved - used to check cache. */
 591
 592 static int num_lookups; /* Counter so we don't always use cache. */
 593 #ifndef PW_RET_CACHE_MAX_LOOKUPS
 594 #define PW_RET_CACHE_MAX_LOOKUPS 100
 595 #endif
 596
 597 static struct passwd *setup_pwret(struct passwd *pass)
 598 {
 599         if (pass == NULL) {
 600                 /* Clear the caches. */
 601                 memset(&pw_cache, '\0', sizeof(struct saved_pw));
 602                 memset(&pw_mod, '\0', sizeof(struct saved_pw));
 603                 num_lookups = 0;
 604                 return NULL;
 605         }
 606
 607         /* this gets the uid, gid and null pointers */
 608
 609         memcpy((char *)&pw_mod.pass, pass, sizeof(struct passwd));
 610         fstrcpy(pw_mod.pw_name, pass->pw_name);
 611         pw_mod.pass.pw_name = pw_mod.pw_name;
 612         fstrcpy(pw_mod.pw_passwd, pass->pw_passwd);
 613         pw_mod.pass.pw_passwd = pw_mod.pw_passwd;
 614
 615
 616         if (pass != &pw_cache.pass) {
 617
 618                 /* If it's a cache miss we must also refill the cache. */
 619
 620                 memcpy((char *)&pw_cache.pass, pass, sizeof(struct passwd));
 621                 fstrcpy(pw_cache.pw_name, pass->pw_name);
 622                 pw_cache.pass.pw_name = pw_cache.pw_name;
 623                 fstrcpy(pw_cache.pw_passwd, pass->pw_passwd);
 624                 pw_cache.pass.pw_passwd = pw_cache.pw_passwd;
 625
 626                 num_lookups = 1;
 627
 628         } else {
 629
 630                 /* Cache hit. */
 631
 632                 num_lookups++;
 633                 num_lookups = (num_lookups % PW_RET_CACHE_MAX_LOOKUPS);
 634         }
 635
 636         return &pw_mod.pass;
 637 }
 638
 639 /**************************************************************************
 640  Wrappers for setpwent(), getpwent() and endpwent()
 641 ****************************************************************************/
 642
 643 void sys_setpwent(void)
 644 {
 645         setup_pwret(NULL); /* Clear cache. */
 646         setpwent();
 647 }
 648
 649 struct passwd *sys_getpwent(void)
 650 {
 651         return setup_pwret(getpwent());
 652 }
 653
 654 void sys_endpwent(void)
 655 {
 656         setup_pwret(NULL); /* Clear cache. */
 657         endpwent();
 658 }
 659
 660 /**************************************************************************
 661  Wrapper for getpwnam(). Always returns a static that can be modified.
 662 ****************************************************************************/
 663
 664 struct passwd *sys_getpwnam(const char *name)
 665 {
 666         if (!name || !name[0])
 667                 return NULL;
 668
 669         /* check for a cache hit first */
 670         if (num_lookups && pw_cache.pass.pw_name && !strcmp(name, pw_cache.pass.pw_name)) {
 671                 return setup_pwret(&pw_cache.pass);
 672         }
 673
 674         return setup_pwret(getpwnam(name));
 675 }
 676
 677 /**************************************************************************
 678  Wrapper for getpwuid(). Always returns a static that can be modified.
 679 ****************************************************************************/
 680
 681 struct passwd *sys_getpwuid(uid_t uid)
 682 {
 683         if (num_lookups && pw_cache.pass.pw_name && (uid == pw_cache.pass.pw_uid)) {
 684                 return setup_pwret(&pw_cache.pass);
 685         }
 686
 687         return setup_pwret(getpwuid(uid));
 688 }
 689
 690 /**************************************************************************
 691  The following are the UNICODE versions of *all* system interface functions
 692  called within Samba. Ok, ok, the exceptions are the gethostbyXX calls,
 693  which currently are left as ascii as they are not used other than in name
 694  resolution.
 695 ****************************************************************************/
 696
 697 /**************************************************************************
 698  Wide stat. Just narrow and call sys_xxx.
 699 ****************************************************************************/
 700
 701 int wsys_stat(const smb_ucs2_t *wfname,SMB_STRUCT_STAT *sbuf)
 702 {
 703         pstring fname;
 704         return sys_stat(unicode_to_unix(fname,wfname,sizeof(fname)), sbuf);
 705 }
 706
 707 /**************************************************************************
 708  Wide lstat. Just narrow and call sys_xxx.
 709 ****************************************************************************/
 710
 711 int wsys_lstat(const smb_ucs2_t *wfname,SMB_STRUCT_STAT *sbuf)
 712 {
 713         pstring fname;
 714         return sys_lstat(unicode_to_unix(fname,wfname,sizeof(fname)), sbuf);
 715 }
 716
 717 /**************************************************************************
 718  Wide creat. Just narrow and call sys_xxx.
 719 ****************************************************************************/
 720
 721 int wsys_creat(const smb_ucs2_t *wfname, mode_t mode)
 722 {
 723         pstring fname;
 724         return sys_creat(unicode_to_unix(fname,wfname,sizeof(fname)), mode);
 725 }
 726
 727 /**************************************************************************
 728  Wide open. Just narrow and call sys_xxx.
 729 ****************************************************************************/
 730
 731 int wsys_open(const smb_ucs2_t *wfname, int oflag, mode_t mode)
 732 {
 733         pstring fname;
 734         return sys_open(unicode_to_unix(fname,wfname,sizeof(fname)), oflag, mode);
 735 }
 736
 737 /**************************************************************************
 738  Wide fopen. Just narrow and call sys_xxx.
 739 ****************************************************************************/
 740
 741 FILE *wsys_fopen(const smb_ucs2_t *wfname, const char *type)
 742 {
 743         pstring fname;
 744         return sys_fopen(unicode_to_unix(fname,wfname,sizeof(fname)), type);
 745 }
 746
 747 /**************************************************************************
 748  Wide opendir. Just narrow and call sys_xxx.
 749 ****************************************************************************/
 750
 751 DIR *wsys_opendir(const smb_ucs2_t *wfname)
 752 {
 753         pstring fname;
 754         return opendir(unicode_to_unix(fname,wfname,sizeof(fname)));
 755 }
 756
 757 /**************************************************************************
 758  Wide readdir. Return a structure pointer containing a wide filename.
 759 ****************************************************************************/
 760
 761 SMB_STRUCT_WDIRENT *wsys_readdir(DIR *dirp)
 762 {
 763         static SMB_STRUCT_WDIRENT retval;
 764         SMB_STRUCT_DIRENT *dirval = sys_readdir(dirp);
 765
 766         if(!dirval)
 767                 return NULL;
 768
 769         /*
 770          * The only POSIX defined member of this struct is d_name.
 771          */
 772
 773         unix_to_unicode(retval.d_name,dirval->d_name,sizeof(retval.d_name));
 774
 775         return &retval;
 776 }
 777
 778 /**************************************************************************
 779  Wide getwd. Call sys_xxx and widen. Assumes s points to a wpstring.
 780 ****************************************************************************/
 781
 782 smb_ucs2_t *wsys_getwd(smb_ucs2_t *s)
 783 {
 784         pstring fname;
 785         char *p = sys_getwd(fname);
 786
 787         if(!p)
 788                 return NULL;
 789
 790         return unix_to_unicode(s, p, sizeof(wpstring));
 791 }
 792
 793 /**************************************************************************
 794  Wide chown. Just narrow and call sys_xxx.
 795 ****************************************************************************/
 796
 797 int wsys_chown(const smb_ucs2_t *wfname, uid_t uid, gid_t gid)
 798 {
 799         pstring fname;
 800         return chown(unicode_to_unix(fname,wfname,sizeof(fname)), uid, gid);
 801 }
 802
 803 /**************************************************************************
 804  Wide chroot. Just narrow and call sys_xxx.
 805 ****************************************************************************/
 806
 807 int wsys_chroot(const smb_ucs2_t *wfname)
 808 {
 809         pstring fname;
 810         return chroot(unicode_to_unix(fname,wfname,sizeof(fname)));
 811 }
 812
 813 /**************************************************************************
 814  Wide getpwnam. Return a structure pointer containing wide names.
 815 ****************************************************************************/
 816
 817 SMB_STRUCT_WPASSWD *wsys_getpwnam(const smb_ucs2_t *wname)
 818 {
 819         static SMB_STRUCT_WPASSWD retval;
 820         fstring name;
 821         struct passwd *pwret = sys_getpwnam(unicode_to_unix(name,wname,sizeof(name)));
 822
 823         if(!pwret)
 824                 return NULL;
 825
 826         unix_to_unicode(retval.pw_name, pwret->pw_name, sizeof(retval.pw_name));
 827         retval.pw_passwd = pwret->pw_passwd;
 828         retval.pw_uid = pwret->pw_uid;
 829         retval.pw_gid = pwret->pw_gid;
 830         unix_to_unicode(retval.pw_gecos, pwret->pw_gecos, sizeof(retval.pw_gecos));
 831         unix_to_unicode(retval.pw_dir, pwret->pw_dir, sizeof(retval.pw_dir));
 832         unix_to_unicode(retval.pw_shell, pwret->pw_shell, sizeof(retval.pw_shell));
 833
 834         return &retval;
 835 }
 836
 837 /**************************************************************************
 838  Wide getpwuid. Return a structure pointer containing wide names.
 839 ****************************************************************************/
 840
 841 SMB_STRUCT_WPASSWD *wsys_getpwuid(uid_t uid)
 842 {
 843         static SMB_STRUCT_WPASSWD retval;
 844         struct passwd *pwret = sys_getpwuid(uid);
 845
 846         if(!pwret)
 847                 return NULL;
 848
 849         unix_to_unicode(retval.pw_name, pwret->pw_name, sizeof(retval.pw_name));
 850         retval.pw_passwd = pwret->pw_passwd;
 851         retval.pw_uid = pwret->pw_uid;
 852         retval.pw_gid = pwret->pw_gid;
 853         unix_to_unicode(retval.pw_gecos, pwret->pw_gecos, sizeof(retval.pw_gecos));
 854         unix_to_unicode(retval.pw_dir, pwret->pw_dir, sizeof(retval.pw_dir));
 855         unix_to_unicode(retval.pw_shell, pwret->pw_shell, sizeof(retval.pw_shell));
 856
 857         return &retval;
 858 }
 859
 860 /**************************************************************************
 861  Extract a command into an arg list. Uses a static pstring for storage.
 862  Caller frees returned arg list (which contains pointers into the static pstring).
 863 ****************************************************************************/
 864
 865 static char **extract_args(const char *command)
 866 {
 867         static pstring trunc_cmd;
 868         char *ptr;
 869         int argcl;
 870         char **argl = NULL;
 871         int i;
 872
 873         pstrcpy(trunc_cmd, command);
 874
 875         if(!(ptr = strtok(trunc_cmd, " \t"))) {
 876                 errno = EINVAL;
 877                 return NULL;
 878         }
 879
 880         /*
 881          * Count the args.
 882          */
 883
 884         for( argcl = 1; ptr; ptr = strtok(NULL, " \t"))
 885                 argcl++;
 886
 887         if((argl = (char **)malloc((argcl + 1) * sizeof(char *))) == NULL)
 888                 return NULL;
 889
 890         /*
 891          * Now do the extraction.
 892          */
 893
 894         pstrcpy(trunc_cmd, command);
 895
 896         ptr = strtok(trunc_cmd, " \t");
 897         i = 0;
 898         argl[i++] = ptr;
 899
 900         while((ptr = strtok(NULL, " \t")) != NULL)
 901                 argl[i++] = ptr;
 902
 903         argl[i++] = NULL;
 904         return argl;
 905 }
 906
 907 /**************************************************************************
 908  Wrapper for fork. Ensures that mypid is reset. Used so we can write
 909  a sys_getpid() that only does a system call *once*.
 910 ****************************************************************************/
 911
 912 static pid_t mypid = (pid_t)-1;
 913
 914 pid_t sys_fork(void)
 915 {
 916         pid_t forkret = fork();
 917
 918         if (forkret == (pid_t)0) /* Child - reset mypid so sys_getpid does a system call. */
 919                 mypid = (pid_t) -1;
 920
 921         return forkret;
 922 }
 923
 924 /**************************************************************************
 925  Wrapper for getpid. Ensures we only do a system call *once*.
 926 ****************************************************************************/
 927
 928 pid_t sys_getpid(void)
 929 {
 930         if (mypid == (pid_t)-1)
 931                 mypid = getpid();
 932
 933         return mypid;
 934 }
 935
 936 /**************************************************************************
 937  Wrapper for popen. Safer as it doesn't search a path.
 938  Modified from the glibc sources.
 939  modified by tridge to return a file descriptor. We must kick our FILE* habit
 940 ****************************************************************************/
 941
 942 typedef struct _popen_list
 943 {
 944         int fd;
 945         pid_t child_pid;
 946         struct _popen_list *next;
 947 } popen_list;
 948
 949 static popen_list *popen_chain;
 950
 951 int sys_popen(const char *command)
 952 {
 953         int parent_end, child_end;
 954         int pipe_fds[2];
 955         popen_list *entry = NULL;
 956         char **argl = NULL;
 957
 958         if (pipe(pipe_fds) < 0)
 959                 return -1;
 960
 961         parent_end = pipe_fds[0];
 962         child_end = pipe_fds[1];
 963
 964         if (!*command) {
 965                 errno = EINVAL;
 966                 goto err_exit;
 967         }
 968
 969         if((entry = (popen_list *)malloc(sizeof(popen_list))) == NULL)
 970                 goto err_exit;
 971
 972         ZERO_STRUCTP(entry);
 973
 974         /*
 975          * Extract the command and args into a NULL terminated array.
 976          */
 977
 978         if(!(argl = extract_args(command)))
 979                 goto err_exit;
 980
 981         entry->child_pid = sys_fork();
 982
 983         if (entry->child_pid == -1) {
 984                 goto err_exit;
 985         }
 986
 987         if (entry->child_pid == 0) {
 988
 989                 /*
 990                  * Child !
 991                  */
 992
 993                 int child_std_end = STDOUT_FILENO;
 994                 popen_list *p;
 995
 996                 close(parent_end);
 997                 if (child_end != child_std_end) {
 998                         dup2 (child_end, child_std_end);
 999                         close (child_end);
1000                 }
1001
1002                 /*
1003                  * POSIX.2:  "popen() shall ensure that any streams from previous
1004                  * popen() calls that remain open in the parent process are closed
1005                  * in the new child process."
1006                  */
1007
1008                 for (p = popen_chain; p; p = p->next)
1009                         close(p->fd);
1010
1011                 execv(argl[0], argl);
1012                 _exit (127);
1013         }
1014
1015         /*
1016          * Parent.
1017          */
1018
1019         close (child_end);
1020         free((char *)argl);
1021
1022         /* Link into popen_chain. */
1023         entry->next = popen_chain;
1024         popen_chain = entry;
1025         entry->fd = parent_end;
1026
1027         return entry->fd;
1028
1029 err_exit:
1030
1031         if(entry)
1032                 free((char *)entry);
1033         if(argl)
1034                 free((char *)argl);
1035         close(pipe_fds[0]);
1036         close(pipe_fds[1]);
1037         return -1;
1038 }
1039
1040 /**************************************************************************
1041  Wrapper for pclose. Modified from the glibc sources.
1042 ****************************************************************************/
1043 int sys_pclose(int fd)
1044 {
1045         int wstatus;
1046         popen_list **ptr = &popen_chain;
1047         popen_list *entry = NULL;
1048         pid_t wait_pid;
1049         int status = -1;
1050
1051         /* Unlink from popen_chain. */
1052         for ( ; *ptr != NULL; ptr = &(*ptr)->next) {
1053                 if ((*ptr)->fd == fd) {
1054                         entry = *ptr;
1055                         *ptr = (*ptr)->next;
1056                         status = 0;
1057                         break;
1058                 }
1059         }
1060
1061         if (status < 0 || close(entry->fd) < 0)
1062                 return -1;
1063
1064         /*
1065          * As Samba is catching and eating child process
1066          * exits we don't really care about the child exit
1067          * code, a -1 with errno = ECHILD will do fine for us.
1068          */
1069
1070         do {
1071                 wait_pid = sys_waitpid (entry->child_pid, &wstatus, 0);
1072         } while (wait_pid == -1 && errno == EINTR);
1073
1074         free((char *)entry);
1075
1076         if (wait_pid == -1)
1077                 return -1;
1078         return wstatus;
1079 }
1080
1081 /**************************************************************************
1082  Wrappers for dlopen, dlsym, dlclose.
1083 ****************************************************************************/
1084
1085 void *sys_dlopen(const char *name, int flags)
1086 {
1087 #ifdef HAVE_LIBDL
1088         return dlopen(name, flags);
1089 #else
1090         return NULL;
1091 #endif
1092 }
1093
1094 void *sys_dlsym(void *handle, char *symbol)
1095 {
1096 #ifdef HAVE_LIBDL
1097     return dlsym(handle, symbol);
1098 #else
1099     return NULL;
1100 #endif
1101 }
1102
1103 int sys_dlclose (void *handle)
1104 {
1105 #ifdef HAVE_LIBDL
1106         return dlclose(handle);
1107 #else
1108         return 0;
1109 #endif
1110 }