lib/replace/replace.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    replacement routines for broken systems
   4    Copyright (C) Andrew Tridgell 1992-1998
   5    Copyright (C) Jelmer Vernooij 2005-2008
   6    Copyright (C) Matthieu Patou  2010
   7
   8      ** NOTE! The following LGPL license applies to the replace
   9      ** library. This does NOT imply that all of Samba is released
  10      ** under the LGPL
  11
  12    This library is free software; you can redistribute it and/or
  13    modify it under the terms of the GNU Lesser General Public
  14    License as published by the Free Software Foundation; either
  15    version 3 of the License, or (at your option) any later version.
  16
  17    This library is distributed in the hope that it will be useful,
  18    but WITHOUT ANY WARRANTY; without even the implied warranty of
  19    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  20    Lesser General Public License for more details.
  21
  22    You should have received a copy of the GNU Lesser General Public
  23    License along with this library; if not, see <http://www.gnu.org/licenses/>.
  24 */
  25
  26 #include "replace.h"
  27
  28 #include "system/filesys.h"
  29 #include "system/time.h"
  30 #include "system/network.h"
  31 #include "system/passwd.h"
  32 #include "system/syslog.h"
  33 #include "system/locale.h"
  34 #include "system/wait.h"
  35
  36 #ifdef _WIN32
  37 #define mkdir(d,m) _mkdir(d)
  38 #endif
  39
  40 void replace_dummy(void);
  41 void replace_dummy(void) {}
  42
  43 #ifndef HAVE_FTRUNCATE
  44  /*******************************************************************
  45 ftruncate for operating systems that don't have it
  46 ********************************************************************/
  47 int rep_ftruncate(int f, off_t l)
  48 {
  49 #ifdef HAVE_CHSIZE
  50       return chsize(f,l);
  51 #elif defined(F_FREESP)
  52       struct  flock   fl;
  53
  54       fl.l_whence = 0;
  55       fl.l_len = 0;
  56       fl.l_start = l;
  57       fl.l_type = F_WRLCK;
  58       return fcntl(f, F_FREESP, &fl);
  59 #else
  60 #error "you must have a ftruncate function"
  61 #endif
  62 }
  63 #endif /* HAVE_FTRUNCATE */
  64
  65
  66 #ifndef HAVE_STRLCPY
  67 /*
  68  * Like strncpy but does not 0 fill the buffer and always null
  69  * terminates. bufsize is the size of the destination buffer.
  70  * Returns the length of s.
  71  */
  72 size_t rep_strlcpy(char *d, const char *s, size_t bufsize)
  73 {
  74         size_t len = strlen(s);
  75         size_t ret = len;
  76
  77         if (bufsize <= 0) {
  78                 return 0;
  79         }
  80         if (len >= bufsize) {
  81                 len = bufsize - 1;
  82         }
  83         memcpy(d, s, len);
  84         d[len] = 0;
  85         return ret;
  86 }
  87 #endif
  88
  89 #ifndef HAVE_STRLCAT
  90 /* like strncat but does not 0 fill the buffer and always null
  91    terminates. bufsize is the length of the buffer, which should
  92    be one more than the maximum resulting string length */
  93 size_t rep_strlcat(char *d, const char *s, size_t bufsize)
  94 {
  95         size_t len1 = strnlen(d, bufsize);
  96         size_t len2 = strlen(s);
  97         size_t ret = len1 + len2;
  98
  99         if (len1+len2 >= bufsize) {
 100                 if (bufsize < (len1+1)) {
 101                         return ret;
 102                 }
 103                 len2 = bufsize - (len1+1);
 104         }
 105         if (len2 > 0) {
 106                 memcpy(d+len1, s, len2);
 107                 d[len1+len2] = 0;
 108         }
 109         return ret;
 110 }
 111 #endif
 112
 113 #ifndef HAVE_MKTIME
 114 /*******************************************************************
 115 a mktime() replacement for those who don't have it - contributed by
 116 C.A. Lademann <cal@zls.com>
 117 Corrections by richard.kettlewell@kewill.com
 118 ********************************************************************/
 119
 120 #define  MINUTE  60
 121 #define  HOUR    60*MINUTE
 122 #define  DAY             24*HOUR
 123 #define  YEAR    365*DAY
 124 time_t rep_mktime(struct tm *t)
 125 {
 126   struct tm       *u;
 127   time_t  epoch = 0;
 128   int n;
 129   int             mon [] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 },
 130   y, m, i;
 131
 132   if(t->tm_year < 70)
 133     return((time_t)-1);
 134
 135   n = t->tm_year + 1900 - 1;
 136   epoch = (t->tm_year - 70) * YEAR +
 137     ((n / 4 - n / 100 + n / 400) - (1969 / 4 - 1969 / 100 + 1969 / 400)) * DAY;
 138
 139   y = t->tm_year + 1900;
 140   m = 0;
 141
 142   for(i = 0; i < t->tm_mon; i++) {
 143     epoch += mon [m] * DAY;
 144     if(m == 1 && y % 4 == 0 && (y % 100 != 0 || y % 400 == 0))
 145       epoch += DAY;
 146
 147     if(++m > 11) {
 148       m = 0;
 149       y++;
 150     }
 151   }
 152
 153   epoch += (t->tm_mday - 1) * DAY;
 154   epoch += t->tm_hour * HOUR + t->tm_min * MINUTE + t->tm_sec;
 155
 156   if((u = localtime(&epoch)) != NULL) {
 157     t->tm_sec = u->tm_sec;
 158     t->tm_min = u->tm_min;
 159     t->tm_hour = u->tm_hour;
 160     t->tm_mday = u->tm_mday;
 161     t->tm_mon = u->tm_mon;
 162     t->tm_year = u->tm_year;
 163     t->tm_wday = u->tm_wday;
 164     t->tm_yday = u->tm_yday;
 165     t->tm_isdst = u->tm_isdst;
 166   }
 167
 168   return(epoch);
 169 }
 170 #endif /* !HAVE_MKTIME */
 171
 172
 173 #ifndef HAVE_INITGROUPS
 174 /****************************************************************************
 175  some systems don't have an initgroups call
 176 ****************************************************************************/
 177 int rep_initgroups(char *name, gid_t id)
 178 {
 179 #ifndef HAVE_SETGROUPS
 180         /* yikes! no SETGROUPS or INITGROUPS? how can this work? */
 181         errno = ENOSYS;
 182         return -1;
 183 #else /* HAVE_SETGROUPS */
 184
 185 #include <grp.h>
 186
 187         gid_t *grouplst = NULL;
 188         int max_gr = NGROUPS_MAX;
 189         int ret;
 190         int    i,j;
 191         struct group *g;
 192         char   *gr;
 193
 194         if((grouplst = malloc(sizeof(gid_t) * max_gr)) == NULL) {
 195                 errno = ENOMEM;
 196                 return -1;
 197         }
 198
 199         grouplst[0] = id;
 200         i = 1;
 201         while (i < max_gr && ((g = (struct group *)getgrent()) != (struct group *)NULL)) {
 202                 if (g->gr_gid == id)
 203                         continue;
 204                 j = 0;
 205                 gr = g->gr_mem[0];
 206                 while (gr && (*gr != (char)NULL)) {
 207                         if (strcmp(name,gr) == 0) {
 208                                 grouplst[i] = g->gr_gid;
 209                                 i++;
 210                                 gr = (char *)NULL;
 211                                 break;
 212                         }
 213                         gr = g->gr_mem[++j];
 214                 }
 215         }
 216         endgrent();
 217         ret = setgroups(i, grouplst);
 218         free(grouplst);
 219         return ret;
 220 #endif /* HAVE_SETGROUPS */
 221 }
 222 #endif /* HAVE_INITGROUPS */
 223
 224
 225 #ifndef HAVE_MEMMOVE
 226 /*******************************************************************
 227 safely copies memory, ensuring no overlap problems.
 228 this is only used if the machine does not have its own memmove().
 229 this is not the fastest algorithm in town, but it will do for our
 230 needs.
 231 ********************************************************************/
 232 void *rep_memmove(void *dest,const void *src,int size)
 233 {
 234         unsigned long d,s;
 235         int i;
 236         if (dest==src || !size) return(dest);
 237
 238         d = (unsigned long)dest;
 239         s = (unsigned long)src;
 240
 241         if ((d >= (s+size)) || (s >= (d+size))) {
 242                 /* no overlap */
 243                 memcpy(dest,src,size);
 244                 return(dest);
 245         }
 246
 247         if (d < s) {
 248                 /* we can forward copy */
 249                 if (s-d >= sizeof(int) &&
 250                     !(s%sizeof(int)) &&
 251                     !(d%sizeof(int)) &&
 252                     !(size%sizeof(int))) {
 253                         /* do it all as words */
 254                         int *idest = (int *)dest;
 255                         int *isrc = (int *)src;
 256                         size /= sizeof(int);
 257                         for (i=0;i<size;i++) idest[i] = isrc[i];
 258                 } else {
 259                         /* simplest */
 260                         char *cdest = (char *)dest;
 261                         char *csrc = (char *)src;
 262                         for (i=0;i<size;i++) cdest[i] = csrc[i];
 263                 }
 264         } else {
 265                 /* must backward copy */
 266                 if (d-s >= sizeof(int) &&
 267                     !(s%sizeof(int)) &&
 268                     !(d%sizeof(int)) &&
 269                     !(size%sizeof(int))) {
 270                         /* do it all as words */
 271                         int *idest = (int *)dest;
 272                         int *isrc = (int *)src;
 273                         size /= sizeof(int);
 274                         for (i=size-1;i>=0;i--) idest[i] = isrc[i];
 275                 } else {
 276                         /* simplest */
 277                         char *cdest = (char *)dest;
 278                         char *csrc = (char *)src;
 279                         for (i=size-1;i>=0;i--) cdest[i] = csrc[i];
 280                 }
 281         }
 282         return(dest);
 283 }
 284 #endif /* HAVE_MEMMOVE */
 285
 286 #ifndef HAVE_STRDUP
 287 /****************************************************************************
 288 duplicate a string
 289 ****************************************************************************/
 290 char *rep_strdup(const char *s)
 291 {
 292         size_t len;
 293         char *ret;
 294
 295         if (!s) return(NULL);
 296
 297         len = strlen(s)+1;
 298         ret = (char *)malloc(len);
 299         if (!ret) return(NULL);
 300         memcpy(ret,s,len);
 301         return(ret);
 302 }
 303 #endif /* HAVE_STRDUP */
 304
 305 #ifndef HAVE_SETLINEBUF
 306 void rep_setlinebuf(FILE *stream)
 307 {
 308         setvbuf(stream, (char *)NULL, _IOLBF, 0);
 309 }
 310 #endif /* HAVE_SETLINEBUF */
 311
 312 #ifndef HAVE_VSYSLOG
 313 #ifdef HAVE_SYSLOG
 314 void rep_vsyslog (int facility_priority, const char *format, va_list arglist)
 315 {
 316         char *msg = NULL;
 317         vasprintf(&msg, format, arglist);
 318         if (!msg)
 319                 return;
 320         syslog(facility_priority, "%s", msg);
 321         free(msg);
 322 }
 323 #endif /* HAVE_SYSLOG */
 324 #endif /* HAVE_VSYSLOG */
 325
 326 #ifndef HAVE_STRNLEN
 327 /**
 328  Some platforms don't have strnlen
 329 **/
 330  size_t rep_strnlen(const char *s, size_t max)
 331 {
 332         size_t len;
 333
 334         for (len = 0; len < max; len++) {
 335                 if (s[len] == '\0') {
 336                         break;
 337                 }
 338         }
 339         return len;
 340 }
 341 #endif
 342
 343 #ifndef HAVE_STRNDUP
 344 /**
 345  Some platforms don't have strndup.
 346 **/
 347 char *rep_strndup(const char *s, size_t n)
 348 {
 349         char *ret;
 350
 351         n = strnlen(s, n);
 352         ret = malloc(n+1);
 353         if (!ret)
 354                 return NULL;
 355         memcpy(ret, s, n);
 356         ret[n] = 0;
 357
 358         return ret;
 359 }
 360 #endif
 361
 362 #if !defined(HAVE_WAITPID) && defined(HAVE_WAIT4)
 363 int rep_waitpid(pid_t pid,int *status,int options)
 364 {
 365   return wait4(pid, status, options, NULL);
 366 }
 367 #endif
 368
 369 #ifndef HAVE_SETEUID
 370 int rep_seteuid(uid_t euid)
 371 {
 372 #ifdef HAVE_SETRESUID
 373         return setresuid(-1, euid, -1);
 374 #else
 375         errno = ENOSYS;
 376         return -1;
 377 #endif
 378 }
 379 #endif
 380
 381 #ifndef HAVE_SETEGID
 382 int rep_setegid(gid_t egid)
 383 {
 384 #ifdef HAVE_SETRESGID
 385         return setresgid(-1, egid, -1);
 386 #else
 387         errno = ENOSYS;
 388         return -1;
 389 #endif
 390 }
 391 #endif
 392
 393 /*******************************************************************
 394 os/2 also doesn't have chroot
 395 ********************************************************************/
 396 #ifndef HAVE_CHROOT
 397 int rep_chroot(const char *dname)
 398 {
 399         errno = ENOSYS;
 400         return -1;
 401 }
 402 #endif
 403
 404 /*****************************************************************
 405  Possibly replace mkstemp if it is broken.
 406 *****************************************************************/
 407
 408 #ifndef HAVE_SECURE_MKSTEMP
 409 int rep_mkstemp(char *template)
 410 {
 411         /* have a reasonable go at emulating it. Hope that
 412            the system mktemp() isn't completely hopeless */
 413         mktemp(template);
 414         if (template[0] == 0)
 415                 return -1;
 416         return open(template, O_CREAT|O_EXCL|O_RDWR, 0600);
 417 }
 418 #endif
 419
 420 #ifndef HAVE_MKDTEMP
 421 char *rep_mkdtemp(char *template)
 422 {
 423         char *dname;
 424
 425         if ((dname = mktemp(template))) {
 426                 if (mkdir(dname, 0700) >= 0) {
 427                         return dname;
 428                 }
 429         }
 430
 431         return NULL;
 432 }
 433 #endif
 434
 435 /*****************************************************************
 436  Watch out: this is not thread safe.
 437 *****************************************************************/
 438
 439 #ifndef HAVE_PREAD
 440 ssize_t rep_pread(int __fd, void *__buf, size_t __nbytes, off_t __offset)
 441 {
 442         if (lseek(__fd, __offset, SEEK_SET) != __offset) {
 443                 return -1;
 444         }
 445         return read(__fd, __buf, __nbytes);
 446 }
 447 #endif
 448
 449 /*****************************************************************
 450  Watch out: this is not thread safe.
 451 *****************************************************************/
 452
 453 #ifndef HAVE_PWRITE
 454 ssize_t rep_pwrite(int __fd, const void *__buf, size_t __nbytes, off_t __offset)
 455 {
 456         if (lseek(__fd, __offset, SEEK_SET) != __offset) {
 457                 return -1;
 458         }
 459         return write(__fd, __buf, __nbytes);
 460 }
 461 #endif
 462
 463 #ifndef HAVE_STRCASESTR
 464 char *rep_strcasestr(const char *haystack, const char *needle)
 465 {
 466         const char *s;
 467         size_t nlen = strlen(needle);
 468         for (s=haystack;*s;s++) {
 469                 if (toupper(*needle) == toupper(*s) &&
 470                     strncasecmp(s, needle, nlen) == 0) {
 471                         return (char *)((uintptr_t)s);
 472                 }
 473         }
 474         return NULL;
 475 }
 476 #endif
 477
 478 #ifndef HAVE_STRSEP
 479 char *rep_strsep(char **pps, const char *delim)
 480 {
 481         char *ret = *pps;
 482         char *p = *pps;
 483
 484         if (p == NULL) {
 485                 return NULL;
 486         }
 487         p += strcspn(p, delim);
 488         if (*p == '\0') {
 489                 *pps = NULL;
 490         } else {
 491                 *p = '\0';
 492                 *pps = p + 1;
 493         }
 494         return ret;
 495 }
 496 #endif
 497
 498 #ifndef HAVE_STRTOK_R
 499 /* based on GLIBC version, copyright Free Software Foundation */
 500 char *rep_strtok_r(char *s, const char *delim, char **save_ptr)
 501 {
 502         char *token;
 503
 504         if (s == NULL) s = *save_ptr;
 505
 506         s += strspn(s, delim);
 507         if (*s == '\0') {
 508                 *save_ptr = s;
 509                 return NULL;
 510         }
 511
 512         token = s;
 513         s = strpbrk(token, delim);
 514         if (s == NULL) {
 515                 *save_ptr = token + strlen(token);
 516         } else {
 517                 *s = '\0';
 518                 *save_ptr = s + 1;
 519         }
 520
 521         return token;
 522 }
 523 #endif
 524
 525
 526 #ifndef HAVE_STRTOLL
 527 long long int rep_strtoll(const char *str, char **endptr, int base)
 528 {
 529 #ifdef HAVE_STRTOQ
 530         return strtoq(str, endptr, base);
 531 #elif defined(HAVE___STRTOLL)
 532         return __strtoll(str, endptr, base);
 533 #elif SIZEOF_LONG == SIZEOF_LONG_LONG
 534         return (long long int) strtol(str, endptr, base);
 535 #else
 536 # error "You need a strtoll function"
 537 #endif
 538 }
 539 #else
 540 #ifdef HAVE_BSD_STRTOLL
 541 #undef strtoll
 542 long long int rep_strtoll(const char *str, char **endptr, int base)
 543 {
 544         int saved_errno = errno;
 545         long long int nb = strtoll(str, endptr, base);
 546         /* With glibc EINVAL is only returned if base is not ok */
 547         if (errno == EINVAL) {
 548                 if (base == 0 || (base >1 && base <37)) {
 549                         /* Base was ok so it's because we were not
 550                          * able to make the convertion.
 551                          * Let's reset errno.
 552                          */
 553                         errno = saved_errno;
 554                 }
 555         }
 556         return nb;
 557 }
 558 #endif /* HAVE_BSD_STRTOLL */
 559 #endif /* HAVE_STRTOLL */
 560
 561
 562 #ifndef HAVE_STRTOULL
 563 unsigned long long int rep_strtoull(const char *str, char **endptr, int base)
 564 {
 565 #ifdef HAVE_STRTOUQ
 566         return strtouq(str, endptr, base);
 567 #elif defined(HAVE___STRTOULL)
 568         return __strtoull(str, endptr, base);
 569 #elif SIZEOF_LONG == SIZEOF_LONG_LONG
 570         return (unsigned long long int) strtoul(str, endptr, base);
 571 #else
 572 # error "You need a strtoull function"
 573 #endif
 574 }
 575 #else
 576 #ifdef HAVE_BSD_STRTOLL
 577 #undef strtoull
 578 unsigned long long int rep_strtoull(const char *str, char **endptr, int base)
 579 {
 580         int saved_errno = errno;
 581         unsigned long long int nb = strtoull(str, endptr, base);
 582         /* With glibc EINVAL is only returned if base is not ok */
 583         if (errno == EINVAL) {
 584                 if (base == 0 || (base >1 && base <37)) {
 585                         /* Base was ok so it's because we were not
 586                          * able to make the convertion.
 587                          * Let's reset errno.
 588                          */
 589                         errno = saved_errno;
 590                 }
 591         }
 592         return nb;
 593 }
 594 #endif /* HAVE_BSD_STRTOLL */
 595 #endif /* HAVE_STRTOULL */
 596
 597 #ifndef HAVE_SETENV
 598 int rep_setenv(const char *name, const char *value, int overwrite)
 599 {
 600         char *p;
 601         size_t l1, l2;
 602         int ret;
 603
 604         if (!overwrite && getenv(name)) {
 605                 return 0;
 606         }
 607
 608         l1 = strlen(name);
 609         l2 = strlen(value);
 610
 611         p = malloc(l1+l2+2);
 612         if (p == NULL) {
 613                 return -1;
 614         }
 615         memcpy(p, name, l1);
 616         p[l1] = '=';
 617         memcpy(p+l1+1, value, l2);
 618         p[l1+l2+1] = 0;
 619
 620         ret = putenv(p);
 621         if (ret != 0) {
 622                 free(p);
 623         }
 624
 625         return ret;
 626 }
 627 #endif
 628
 629 #ifndef HAVE_UNSETENV
 630 int rep_unsetenv(const char *name)
 631 {
 632         extern char **environ;
 633         size_t len = strlen(name);
 634         size_t i, count;
 635
 636         if (environ == NULL || getenv(name) == NULL) {
 637                 return 0;
 638         }
 639
 640         for (i=0;environ[i];i++) /* noop */ ;
 641
 642         count=i;
 643
 644         for (i=0;i<count;) {
 645                 if (strncmp(environ[i], name, len) == 0 && environ[i][len] == '=') {
 646                         /* note: we do _not_ free the old variable here. It is unsafe to
 647                            do so, as the pointer may not have come from malloc */
 648                         memmove(&environ[i], &environ[i+1], (count-i)*sizeof(char *));
 649                         count--;
 650                 } else {
 651                         i++;
 652                 }
 653         }
 654
 655         return 0;
 656 }
 657 #endif
 658
 659 #ifndef HAVE_UTIME
 660 int rep_utime(const char *filename, const struct utimbuf *buf)
 661 {
 662         errno = ENOSYS;
 663         return -1;
 664 }
 665 #endif
 666
 667 #ifndef HAVE_UTIMES
 668 int rep_utimes(const char *filename, const struct timeval tv[2])
 669 {
 670         struct utimbuf u;
 671
 672         u.actime = tv[0].tv_sec;
 673         if (tv[0].tv_usec > 500000) {
 674                 u.actime += 1;
 675         }
 676
 677         u.modtime = tv[1].tv_sec;
 678         if (tv[1].tv_usec > 500000) {
 679                 u.modtime += 1;
 680         }
 681
 682         return utime(filename, &u);
 683 }
 684 #endif
 685
 686 #ifndef HAVE_DUP2
 687 int rep_dup2(int oldfd, int newfd)
 688 {
 689         errno = ENOSYS;
 690         return -1;
 691 }
 692 #endif
 693
 694 #ifndef HAVE_CHOWN
 695 /**
 696 chown isn't used much but OS/2 doesn't have it
 697 **/
 698 int rep_chown(const char *fname, uid_t uid, gid_t gid)
 699 {
 700         errno = ENOSYS;
 701         return -1;
 702 }
 703 #endif
 704
 705 #ifndef HAVE_LINK
 706 int rep_link(const char *oldpath, const char *newpath)
 707 {
 708         errno = ENOSYS;
 709         return -1;
 710 }
 711 #endif
 712
 713 #ifndef HAVE_READLINK
 714 int rep_readlink(const char *path, char *buf, size_t bufsiz)
 715 {
 716         errno = ENOSYS;
 717         return -1;
 718 }
 719 #endif
 720
 721 #ifndef HAVE_SYMLINK
 722 int rep_symlink(const char *oldpath, const char *newpath)
 723 {
 724         errno = ENOSYS;
 725         return -1;
 726 }
 727 #endif
 728
 729 #ifndef HAVE_LCHOWN
 730 int rep_lchown(const char *fname,uid_t uid,gid_t gid)
 731 {
 732         errno = ENOSYS;
 733         return -1;
 734 }
 735 #endif
 736
 737 #ifndef HAVE_REALPATH
 738 char *rep_realpath(const char *path, char *resolved_path)
 739 {
 740         /* As realpath is not a system call we can't return ENOSYS. */
 741         errno = EINVAL;
 742         return NULL;
 743 }
 744 #endif
 745
 746
 747 #ifndef HAVE_MEMMEM
 748 void *rep_memmem(const void *haystack, size_t haystacklen,
 749                  const void *needle, size_t needlelen)
 750 {
 751         if (needlelen == 0) {
 752                 return discard_const(haystack);
 753         }
 754         while (haystacklen >= needlelen) {
 755                 char *p = (char *)memchr(haystack, *(const char *)needle,
 756                                          haystacklen-(needlelen-1));
 757                 if (!p) return NULL;
 758                 if (memcmp(p, needle, needlelen) == 0) {
 759                         return p;
 760                 }
 761                 haystack = p+1;
 762                 haystacklen -= (p - (const char *)haystack) + 1;
 763         }
 764         return NULL;
 765 }
 766 #endif
 767
 768 #if !defined(HAVE_VDPRINTF) || !defined(HAVE_C99_VSNPRINTF)
 769 int rep_vdprintf(int fd, const char *format, va_list ap)
 770 {
 771         char *s = NULL;
 772         int ret;
 773
 774         vasprintf(&s, format, ap);
 775         if (s == NULL) {
 776                 errno = ENOMEM;
 777                 return -1;
 778         }
 779         ret = write(fd, s, strlen(s));
 780         free(s);
 781         return ret;
 782 }
 783 #endif
 784
 785 #if !defined(HAVE_DPRINTF) || !defined(HAVE_C99_VSNPRINTF)
 786 int rep_dprintf(int fd, const char *format, ...)
 787 {
 788         int ret;
 789         va_list ap;
 790
 791         va_start(ap, format);
 792         ret = vdprintf(fd, format, ap);
 793         va_end(ap);
 794
 795         return ret;
 796 }
 797 #endif
 798
 799 #ifndef HAVE_GET_CURRENT_DIR_NAME
 800 char *rep_get_current_dir_name(void)
 801 {
 802         char buf[PATH_MAX+1];
 803         char *p;
 804         p = getcwd(buf, sizeof(buf));
 805         if (p == NULL) {
 806                 return NULL;
 807         }
 808         return strdup(p);
 809 }
 810 #endif
 811
 812 #ifndef HAVE_STRERROR_R
 813 int rep_strerror_r(int errnum, char *buf, size_t buflen)
 814 {
 815         char *s = strerror(errnum);
 816         if (strlen(s)+1 > buflen) {
 817                 errno = ERANGE;
 818                 return -1;
 819         }
 820         strncpy(buf, s, buflen);
 821         return 0;
 822 }
 823 #elif (!defined(STRERROR_R_XSI_NOT_GNU))
 824 #undef strerror_r
 825 int rep_strerror_r(int errnum, char *buf, size_t buflen)
 826 {
 827         char *s = strerror_r(errnum, buf, buflen);
 828         if (s == NULL) {
 829                 /* Shouldn't happen, should always get a string */
 830                 return EINVAL;
 831         }
 832         if (s != buf) {
 833                 strlcpy(buf, s, buflen);
 834                 if (strlen(s) > buflen - 1) {
 835                         return ERANGE;
 836                 }
 837         }
 838         return 0;
 839
 840 }
 841 #endif
 842
 843 #ifndef HAVE_CLOCK_GETTIME
 844 int rep_clock_gettime(clockid_t clk_id, struct timespec *tp)
 845 {
 846         struct timeval tval;
 847         switch (clk_id) {
 848                 case 0: /* CLOCK_REALTIME :*/
 849 #if defined(HAVE_GETTIMEOFDAY_TZ) || defined(HAVE_GETTIMEOFDAY_TZ_VOID)
 850                         gettimeofday(&tval,NULL);
 851 #else
 852                         gettimeofday(&tval);
 853 #endif
 854                         tp->tv_sec = tval.tv_sec;
 855                         tp->tv_nsec = tval.tv_usec * 1000;
 856                         break;
 857                 default:
 858                         errno = EINVAL;
 859                         return -1;
 860         }
 861         return 0;
 862 }
 863 #endif
 864
 865 #ifndef HAVE_MEMALIGN
 866 void *rep_memalign( size_t align, size_t size )
 867 {
 868 #if defined(HAVE_POSIX_MEMALIGN)
 869         void *p = NULL;
 870         int ret = posix_memalign( &p, align, size );
 871         if ( ret == 0 )
 872                 return p;
 873
 874         return NULL;
 875 #else
 876         /* On *BSD systems memaligns doesn't exist, but memory will
 877          * be aligned on allocations of > pagesize. */
 878 #if defined(SYSCONF_SC_PAGESIZE)
 879         size_t pagesize = (size_t)sysconf(_SC_PAGESIZE);
 880 #elif defined(HAVE_GETPAGESIZE)
 881         size_t pagesize = (size_t)getpagesize();
 882 #else
 883         size_t pagesize = (size_t)-1;
 884 #endif
 885         if (pagesize == (size_t)-1) {
 886                 errno = ENOSYS;
 887                 return NULL;
 888         }
 889         if (size < pagesize) {
 890                 size = pagesize;
 891         }
 892         return malloc(size);
 893 #endif
 894 }
 895 #endif
 896
 897 #ifndef HAVE_GETPEEREID
 898 int rep_getpeereid(int s, uid_t *uid, gid_t *gid)
 899 {
 900 #if defined(HAVE_PEERCRED)
 901         struct ucred cred;
 902         socklen_t cred_len = sizeof(struct ucred);
 903         int ret;
 904
 905 #undef getsockopt
 906         ret = getsockopt(s, SOL_SOCKET, SO_PEERCRED, (void *)&cred, &cred_len);
 907         if (ret != 0) {
 908                 return -1;
 909         }
 910
 911         if (cred_len != sizeof(struct ucred)) {
 912                 errno = EINVAL;
 913                 return -1;
 914         }
 915
 916         *uid = cred.uid;
 917         *gid = cred.gid;
 918         return 0;
 919 #else
 920         errno = ENOSYS;
 921         return -1;
 922 #endif
 923 }
 924 #endif
 925
 926 #ifndef HAVE_USLEEP
 927 int rep_usleep(useconds_t sec)
 928 {
 929         struct timeval tval;
 930         /*
 931          * Fake it with select...
 932          */
 933         tval.tv_sec = 0;
 934         tval.tv_usec = usecs/1000;
 935         select(0,NULL,NULL,NULL,&tval);
 936         return 0;
 937 }
 938 #endif /* HAVE_USLEEP */
 939
 940 #ifndef HAVE_SETPROCTITLE
 941 void rep_setproctitle(const char *fmt, ...)
 942 {
 943 }
 944 #endif
 945 #ifndef HAVE_SETPROCTITLE_INIT
 946 void rep_setproctitle_init(int argc, char *argv[], char *envp[])
 947 {
 948 }
 949 #endif
 950
 951 #ifndef HAVE_MEMSET_S
 952 # ifndef RSIZE_MAX
 953 #  define RSIZE_MAX (SIZE_MAX >> 1)
 954 # endif
 955
 956 int rep_memset_s(void *dest, size_t destsz, int ch, size_t count)
 957 {
 958         if (dest == NULL) {
 959                 return EINVAL;
 960         }
 961
 962         if (destsz > RSIZE_MAX ||
 963             count > RSIZE_MAX ||
 964             count > destsz) {
 965                 return ERANGE;
 966         }
 967
 968 #if defined(HAVE_MEMSET_EXPLICIT)
 969         memset_explicit(dest, destsz, ch, count);
 970 #else /* HAVE_MEMSET_EXPLICIT */
 971         memset(dest, ch, count);
 972 # if defined(HAVE_GCC_VOLATILE_MEMORY_PROTECTION)
 973         /* See http://llvm.org/bugs/show_bug.cgi?id=15495 */
 974         __asm__ volatile("" : : "g"(dest) : "memory");
 975 # endif /* HAVE_GCC_VOLATILE_MEMORY_PROTECTION */
 976 #endif /* HAVE_MEMSET_EXPLICIT */
 977
 978         return 0;
 979 }
 980 #endif /* HAVE_MEMSET_S */
 981
 982 #ifndef HAVE_GETPROGNAME
 983 # ifndef HAVE_PROGRAM_INVOCATION_SHORT_NAME
 984 # define PROGNAME_SIZE 32
 985 static char rep_progname[PROGNAME_SIZE];
 986 # endif /* HAVE_PROGRAM_INVOCATION_SHORT_NAME */
 987
 988 const char *rep_getprogname(void)
 989 {
 990 #ifdef HAVE_PROGRAM_INVOCATION_SHORT_NAME
 991         return program_invocation_short_name;
 992 #else /* HAVE_PROGRAM_INVOCATION_SHORT_NAME */
 993         FILE *fp = NULL;
 994         char cmdline[4096] = {0};
 995         char *p = NULL;
 996         pid_t pid;
 997         size_t nread;
 998         int len;
 999         int rc;
1000
1001         if (rep_progname[0] != '\0') {
1002                 return rep_progname;
1003         }
1004
1005         len = snprintf(rep_progname, sizeof(rep_progname), "%s", "<unknown>");
1006         if (len <= 0) {
1007                 return NULL;
1008         }
1009
1010         pid = getpid();
1011         if (pid <= 1 || pid == (pid_t)-1) {
1012                 return NULL;
1013         }
1014
1015         len = snprintf(cmdline,
1016                        sizeof(cmdline),
1017                        "/proc/%u/cmdline",
1018                        (unsigned int)pid);
1019         if (len <= 0 || len == sizeof(cmdline)) {
1020                 return NULL;
1021         }
1022
1023         fp = fopen(cmdline, "r");
1024         if (fp == NULL) {
1025                 return NULL;
1026         }
1027
1028         nread = fread(cmdline, 1, sizeof(cmdline) - 1, fp);
1029
1030         rc = fclose(fp);
1031         if (rc != 0) {
1032                 return NULL;
1033         }
1034
1035         if (nread == 0) {
1036                 return NULL;
1037         }
1038
1039         cmdline[nread] = '\0';
1040
1041         p = strrchr(cmdline, '/');
1042         if (p != NULL) {
1043                 p++;
1044         } else {
1045                 p = cmdline;
1046         }
1047
1048         len = strlen(p);
1049         if (len > PROGNAME_SIZE) {
1050                 p[PROGNAME_SIZE - 1] = '\0';
1051         }
1052
1053         (void)snprintf(rep_progname, sizeof(rep_progname), "%s", p);
1054
1055         return rep_progname;
1056 #endif /* HAVE_PROGRAM_INVOCATION_SHORT_NAME */
1057 }
1058 #endif /* HAVE_GETPROGNAME */