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 HAVE_SYS_SYSCALL_H
  37 #include <sys/syscall.h>
  38 #endif
  39
  40 #ifdef _WIN32
  41 #define mkdir(d,m) _mkdir(d)
  42 #endif
  43
  44 void replace_dummy(void);
  45 void replace_dummy(void) {}
  46
  47 #ifndef HAVE_FTRUNCATE
  48  /*******************************************************************
  49 ftruncate for operating systems that don't have it
  50 ********************************************************************/
  51 int rep_ftruncate(int f, off_t l)
  52 {
  53 #ifdef HAVE_CHSIZE
  54       return chsize(f,l);
  55 #elif defined(F_FREESP)
  56       struct  flock   fl;
  57
  58       fl.l_whence = 0;
  59       fl.l_len = 0;
  60       fl.l_start = l;
  61       fl.l_type = F_WRLCK;
  62       return fcntl(f, F_FREESP, &fl);
  63 #else
  64 #error "you must have a ftruncate function"
  65 #endif
  66 }
  67 #endif /* HAVE_FTRUNCATE */
  68
  69
  70 #ifndef HAVE_STRLCPY
  71 /*
  72  * Like strncpy but does not 0 fill the buffer and always null
  73  * terminates. bufsize is the size of the destination buffer.
  74  * Returns the length of s.
  75  */
  76 size_t rep_strlcpy(char *d, const char *s, size_t bufsize)
  77 {
  78         size_t len = strlen(s);
  79         size_t ret = len;
  80
  81         if (bufsize <= 0) {
  82                 return 0;
  83         }
  84         if (len >= bufsize) {
  85                 len = bufsize - 1;
  86         }
  87         memcpy(d, s, len);
  88         d[len] = 0;
  89         return ret;
  90 }
  91 #endif
  92
  93 #ifndef HAVE_STRLCAT
  94 /* like strncat but does not 0 fill the buffer and always null
  95    terminates. bufsize is the length of the buffer, which should
  96    be one more than the maximum resulting string length */
  97 size_t rep_strlcat(char *d, const char *s, size_t bufsize)
  98 {
  99         size_t len1 = strnlen(d, bufsize);
 100         size_t len2 = strlen(s);
 101         size_t ret = len1 + len2;
 102
 103         if (len1+len2 >= bufsize) {
 104                 if (bufsize < (len1+1)) {
 105                         return ret;
 106                 }
 107                 len2 = bufsize - (len1+1);
 108         }
 109         if (len2 > 0) {
 110                 memcpy(d+len1, s, len2);
 111                 d[len1+len2] = 0;
 112         }
 113         return ret;
 114 }
 115 #endif
 116
 117 #ifndef HAVE_MKTIME
 118 /*******************************************************************
 119 a mktime() replacement for those who don't have it - contributed by
 120 C.A. Lademann <cal@zls.com>
 121 Corrections by richard.kettlewell@kewill.com
 122 ********************************************************************/
 123
 124 #define  MINUTE  60
 125 #define  HOUR    60*MINUTE
 126 #define  DAY             24*HOUR
 127 #define  YEAR    365*DAY
 128 time_t rep_mktime(struct tm *t)
 129 {
 130   struct tm       *u;
 131   time_t  epoch = 0;
 132   int n;
 133   int             mon [] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 },
 134   y, m, i;
 135
 136   if(t->tm_year < 70)
 137     return((time_t)-1);
 138
 139   n = t->tm_year + 1900 - 1;
 140   epoch = (t->tm_year - 70) * YEAR +
 141     ((n / 4 - n / 100 + n / 400) - (1969 / 4 - 1969 / 100 + 1969 / 400)) * DAY;
 142
 143   y = t->tm_year + 1900;
 144   m = 0;
 145
 146   for(i = 0; i < t->tm_mon; i++) {
 147     epoch += mon [m] * DAY;
 148     if(m == 1 && y % 4 == 0 && (y % 100 != 0 || y % 400 == 0))
 149       epoch += DAY;
 150
 151     if(++m > 11) {
 152       m = 0;
 153       y++;
 154     }
 155   }
 156
 157   epoch += (t->tm_mday - 1) * DAY;
 158   epoch += t->tm_hour * HOUR + t->tm_min * MINUTE + t->tm_sec;
 159
 160   if((u = localtime(&epoch)) != NULL) {
 161     t->tm_sec = u->tm_sec;
 162     t->tm_min = u->tm_min;
 163     t->tm_hour = u->tm_hour;
 164     t->tm_mday = u->tm_mday;
 165     t->tm_mon = u->tm_mon;
 166     t->tm_year = u->tm_year;
 167     t->tm_wday = u->tm_wday;
 168     t->tm_yday = u->tm_yday;
 169     t->tm_isdst = u->tm_isdst;
 170   }
 171
 172   return(epoch);
 173 }
 174 #endif /* !HAVE_MKTIME */
 175
 176
 177 #ifndef HAVE_INITGROUPS
 178 /****************************************************************************
 179  some systems don't have an initgroups call
 180 ****************************************************************************/
 181 int rep_initgroups(char *name, gid_t id)
 182 {
 183 #ifndef HAVE_SETGROUPS
 184         /* yikes! no SETGROUPS or INITGROUPS? how can this work? */
 185         errno = ENOSYS;
 186         return -1;
 187 #else /* HAVE_SETGROUPS */
 188
 189 #include <grp.h>
 190
 191         gid_t *grouplst = NULL;
 192         int max_gr = NGROUPS_MAX;
 193         int ret;
 194         int    i,j;
 195         struct group *g;
 196         char   *gr;
 197
 198         if((grouplst = malloc(sizeof(gid_t) * max_gr)) == NULL) {
 199                 errno = ENOMEM;
 200                 return -1;
 201         }
 202
 203         grouplst[0] = id;
 204         i = 1;
 205         while (i < max_gr && ((g = (struct group *)getgrent()) != (struct group *)NULL)) {
 206                 if (g->gr_gid == id)
 207                         continue;
 208                 j = 0;
 209                 gr = g->gr_mem[0];
 210                 while (gr && (*gr != (char)NULL)) {
 211                         if (strcmp(name,gr) == 0) {
 212                                 grouplst[i] = g->gr_gid;
 213                                 i++;
 214                                 gr = (char *)NULL;
 215                                 break;
 216                         }
 217                         gr = g->gr_mem[++j];
 218                 }
 219         }
 220         endgrent();
 221         ret = setgroups(i, grouplst);
 222         free(grouplst);
 223         return ret;
 224 #endif /* HAVE_SETGROUPS */
 225 }
 226 #endif /* HAVE_INITGROUPS */
 227
 228
 229 #ifndef HAVE_MEMMOVE
 230 /*******************************************************************
 231 safely copies memory, ensuring no overlap problems.
 232 this is only used if the machine does not have its own memmove().
 233 this is not the fastest algorithm in town, but it will do for our
 234 needs.
 235 ********************************************************************/
 236 void *rep_memmove(void *dest,const void *src,int size)
 237 {
 238         unsigned long d,s;
 239         int i;
 240         if (dest==src || !size) return(dest);
 241
 242         d = (unsigned long)dest;
 243         s = (unsigned long)src;
 244
 245         if ((d >= (s+size)) || (s >= (d+size))) {
 246                 /* no overlap */
 247                 memcpy(dest,src,size);
 248                 return(dest);
 249         }
 250
 251         if (d < s) {
 252                 /* we can forward copy */
 253                 if (s-d >= sizeof(int) &&
 254                     !(s%sizeof(int)) &&
 255                     !(d%sizeof(int)) &&
 256                     !(size%sizeof(int))) {
 257                         /* do it all as words */
 258                         int *idest = (int *)dest;
 259                         int *isrc = (int *)src;
 260                         size /= sizeof(int);
 261                         for (i=0;i<size;i++) idest[i] = isrc[i];
 262                 } else {
 263                         /* simplest */
 264                         char *cdest = (char *)dest;
 265                         char *csrc = (char *)src;
 266                         for (i=0;i<size;i++) cdest[i] = csrc[i];
 267                 }
 268         } else {
 269                 /* must backward copy */
 270                 if (d-s >= sizeof(int) &&
 271                     !(s%sizeof(int)) &&
 272                     !(d%sizeof(int)) &&
 273                     !(size%sizeof(int))) {
 274                         /* do it all as words */
 275                         int *idest = (int *)dest;
 276                         int *isrc = (int *)src;
 277                         size /= sizeof(int);
 278                         for (i=size-1;i>=0;i--) idest[i] = isrc[i];
 279                 } else {
 280                         /* simplest */
 281                         char *cdest = (char *)dest;
 282                         char *csrc = (char *)src;
 283                         for (i=size-1;i>=0;i--) cdest[i] = csrc[i];
 284                 }
 285         }
 286         return(dest);
 287 }
 288 #endif /* HAVE_MEMMOVE */
 289
 290 #ifndef HAVE_STRDUP
 291 /****************************************************************************
 292 duplicate a string
 293 ****************************************************************************/
 294 char *rep_strdup(const char *s)
 295 {
 296         size_t len;
 297         char *ret;
 298
 299         if (!s) return(NULL);
 300
 301         len = strlen(s)+1;
 302         ret = (char *)malloc(len);
 303         if (!ret) return(NULL);
 304         memcpy(ret,s,len);
 305         return(ret);
 306 }
 307 #endif /* HAVE_STRDUP */
 308
 309 #ifndef HAVE_SETLINEBUF
 310 void rep_setlinebuf(FILE *stream)
 311 {
 312         setvbuf(stream, (char *)NULL, _IOLBF, 0);
 313 }
 314 #endif /* HAVE_SETLINEBUF */
 315
 316 #ifndef HAVE_VSYSLOG
 317 #ifdef HAVE_SYSLOG
 318 void rep_vsyslog (int facility_priority, const char *format, va_list arglist)
 319 {
 320         char *msg = NULL;
 321         vasprintf(&msg, format, arglist);
 322         if (!msg)
 323                 return;
 324         syslog(facility_priority, "%s", msg);
 325         free(msg);
 326 }
 327 #endif /* HAVE_SYSLOG */
 328 #endif /* HAVE_VSYSLOG */
 329
 330 #ifndef HAVE_STRNLEN
 331 /**
 332  Some platforms don't have strnlen
 333 **/
 334  size_t rep_strnlen(const char *s, size_t max)
 335 {
 336         size_t len;
 337
 338         for (len = 0; len < max; len++) {
 339                 if (s[len] == '\0') {
 340                         break;
 341                 }
 342         }
 343         return len;
 344 }
 345 #endif
 346
 347 #ifndef HAVE_STRNDUP
 348 /**
 349  Some platforms don't have strndup.
 350 **/
 351 char *rep_strndup(const char *s, size_t n)
 352 {
 353         char *ret;
 354
 355         n = strnlen(s, n);
 356         ret = malloc(n+1);
 357         if (!ret)
 358                 return NULL;
 359         memcpy(ret, s, n);
 360         ret[n] = 0;
 361
 362         return ret;
 363 }
 364 #endif
 365
 366 #if !defined(HAVE_WAITPID) && defined(HAVE_WAIT4)
 367 int rep_waitpid(pid_t pid,int *status,int options)
 368 {
 369   return wait4(pid, status, options, NULL);
 370 }
 371 #endif
 372
 373 #ifndef HAVE_SETEUID
 374 int rep_seteuid(uid_t euid)
 375 {
 376 #ifdef HAVE_SETRESUID
 377         return setresuid(-1, euid, -1);
 378 #else
 379         errno = ENOSYS;
 380         return -1;
 381 #endif
 382 }
 383 #endif
 384
 385 #ifndef HAVE_SETEGID
 386 int rep_setegid(gid_t egid)
 387 {
 388 #ifdef HAVE_SETRESGID
 389         return setresgid(-1, egid, -1);
 390 #else
 391         errno = ENOSYS;
 392         return -1;
 393 #endif
 394 }
 395 #endif
 396
 397 /*******************************************************************
 398 os/2 also doesn't have chroot
 399 ********************************************************************/
 400 #ifndef HAVE_CHROOT
 401 int rep_chroot(const char *dname)
 402 {
 403         errno = ENOSYS;
 404         return -1;
 405 }
 406 #endif
 407
 408 /*****************************************************************
 409  Possibly replace mkstemp if it is broken.
 410 *****************************************************************/
 411
 412 #ifndef HAVE_SECURE_MKSTEMP
 413 int rep_mkstemp(char *template)
 414 {
 415         /* have a reasonable go at emulating it. Hope that
 416            the system mktemp() isn't completely hopeless */
 417         mktemp(template);
 418         if (template[0] == 0)
 419                 return -1;
 420         return open(template, O_CREAT|O_EXCL|O_RDWR, 0600);
 421 }
 422 #endif
 423
 424 #ifndef HAVE_MKDTEMP
 425 char *rep_mkdtemp(char *template)
 426 {
 427         char *dname;
 428
 429         if ((dname = mktemp(template))) {
 430                 if (mkdir(dname, 0700) >= 0) {
 431                         return dname;
 432                 }
 433         }
 434
 435         return NULL;
 436 }
 437 #endif
 438
 439 /*****************************************************************
 440  Watch out: this is not thread safe.
 441 *****************************************************************/
 442
 443 #ifndef HAVE_PREAD
 444 ssize_t rep_pread(int __fd, void *__buf, size_t __nbytes, off_t __offset)
 445 {
 446         if (lseek(__fd, __offset, SEEK_SET) != __offset) {
 447                 return -1;
 448         }
 449         return read(__fd, __buf, __nbytes);
 450 }
 451 #endif
 452
 453 /*****************************************************************
 454  Watch out: this is not thread safe.
 455 *****************************************************************/
 456
 457 #ifndef HAVE_PWRITE
 458 ssize_t rep_pwrite(int __fd, const void *__buf, size_t __nbytes, off_t __offset)
 459 {
 460         if (lseek(__fd, __offset, SEEK_SET) != __offset) {
 461                 return -1;
 462         }
 463         return write(__fd, __buf, __nbytes);
 464 }
 465 #endif
 466
 467 #ifndef HAVE_STRCASESTR
 468 char *rep_strcasestr(const char *haystack, const char *needle)
 469 {
 470         const char *s;
 471         size_t nlen = strlen(needle);
 472         for (s=haystack;*s;s++) {
 473                 if (toupper(*needle) == toupper(*s) &&
 474                     strncasecmp(s, needle, nlen) == 0) {
 475                         return (char *)((uintptr_t)s);
 476                 }
 477         }
 478         return NULL;
 479 }
 480 #endif
 481
 482 #ifndef HAVE_STRSEP
 483 char *rep_strsep(char **pps, const char *delim)
 484 {
 485         char *ret = *pps;
 486         char *p = *pps;
 487
 488         if (p == NULL) {
 489                 return NULL;
 490         }
 491         p += strcspn(p, delim);
 492         if (*p == '\0') {
 493                 *pps = NULL;
 494         } else {
 495                 *p = '\0';
 496                 *pps = p + 1;
 497         }
 498         return ret;
 499 }
 500 #endif
 501
 502 #ifndef HAVE_STRTOK_R
 503 /* based on GLIBC version, copyright Free Software Foundation */
 504 char *rep_strtok_r(char *s, const char *delim, char **save_ptr)
 505 {
 506         char *token;
 507
 508         if (s == NULL) s = *save_ptr;
 509
 510         s += strspn(s, delim);
 511         if (*s == '\0') {
 512                 *save_ptr = s;
 513                 return NULL;
 514         }
 515
 516         token = s;
 517         s = strpbrk(token, delim);
 518         if (s == NULL) {
 519                 *save_ptr = token + strlen(token);
 520         } else {
 521                 *s = '\0';
 522                 *save_ptr = s + 1;
 523         }
 524
 525         return token;
 526 }
 527 #endif
 528
 529
 530 #ifndef HAVE_STRTOLL
 531 long long int rep_strtoll(const char *str, char **endptr, int base)
 532 {
 533 #ifdef HAVE_STRTOQ
 534         return strtoq(str, endptr, base);
 535 #elif defined(HAVE___STRTOLL)
 536         return __strtoll(str, endptr, base);
 537 #elif SIZEOF_LONG == SIZEOF_LONG_LONG
 538         return (long long int) strtol(str, endptr, base);
 539 #else
 540 # error "You need a strtoll function"
 541 #endif
 542 }
 543 #else
 544 #ifdef HAVE_BSD_STRTOLL
 545 #undef strtoll
 546 long long int rep_strtoll(const char *str, char **endptr, int base)
 547 {
 548         int saved_errno = errno;
 549         long long int nb = strtoll(str, endptr, base);
 550         /* With glibc EINVAL is only returned if base is not ok */
 551         if (errno == EINVAL) {
 552                 if (base == 0 || (base >1 && base <37)) {
 553                         /* Base was ok so it's because we were not
 554                          * able to make the conversion.
 555                          * Let's reset errno.
 556                          */
 557                         errno = saved_errno;
 558                 }
 559         }
 560         return nb;
 561 }
 562 #endif /* HAVE_BSD_STRTOLL */
 563 #endif /* HAVE_STRTOLL */
 564
 565
 566 #ifndef HAVE_STRTOULL
 567 unsigned long long int rep_strtoull(const char *str, char **endptr, int base)
 568 {
 569 #ifdef HAVE_STRTOUQ
 570         return strtouq(str, endptr, base);
 571 #elif defined(HAVE___STRTOULL)
 572         return __strtoull(str, endptr, base);
 573 #elif SIZEOF_LONG == SIZEOF_LONG_LONG
 574         return (unsigned long long int) strtoul(str, endptr, base);
 575 #else
 576 # error "You need a strtoull function"
 577 #endif
 578 }
 579 #else
 580 #ifdef HAVE_BSD_STRTOLL
 581 #undef strtoull
 582 unsigned long long int rep_strtoull(const char *str, char **endptr, int base)
 583 {
 584         int saved_errno = errno;
 585         unsigned long long int nb = strtoull(str, endptr, base);
 586         /* With glibc EINVAL is only returned if base is not ok */
 587         if (errno == EINVAL) {
 588                 if (base == 0 || (base >1 && base <37)) {
 589                         /* Base was ok so it's because we were not
 590                          * able to make the conversion.
 591                          * Let's reset errno.
 592                          */
 593                         errno = saved_errno;
 594                 }
 595         }
 596         return nb;
 597 }
 598 #endif /* HAVE_BSD_STRTOLL */
 599 #endif /* HAVE_STRTOULL */
 600
 601 #ifndef HAVE_SETENV
 602 int rep_setenv(const char *name, const char *value, int overwrite)
 603 {
 604         char *p;
 605         size_t l1, l2;
 606         int ret;
 607
 608         if (!overwrite && getenv(name)) {
 609                 return 0;
 610         }
 611
 612         l1 = strlen(name);
 613         l2 = strlen(value);
 614
 615         p = malloc(l1+l2+2);
 616         if (p == NULL) {
 617                 return -1;
 618         }
 619         memcpy(p, name, l1);
 620         p[l1] = '=';
 621         memcpy(p+l1+1, value, l2);
 622         p[l1+l2+1] = 0;
 623
 624         ret = putenv(p);
 625         if (ret != 0) {
 626                 free(p);
 627         }
 628
 629         return ret;
 630 }
 631 #endif
 632
 633 #ifndef HAVE_UNSETENV
 634 int rep_unsetenv(const char *name)
 635 {
 636         extern char **environ;
 637         size_t len = strlen(name);
 638         size_t i, count;
 639
 640         if (environ == NULL || getenv(name) == NULL) {
 641                 return 0;
 642         }
 643
 644         for (i=0;environ[i];i++) /* noop */ ;
 645
 646         count=i;
 647
 648         for (i=0;i<count;) {
 649                 if (strncmp(environ[i], name, len) == 0 && environ[i][len] == '=') {
 650                         /* note: we do _not_ free the old variable here. It is unsafe to
 651                            do so, as the pointer may not have come from malloc */
 652                         memmove(&environ[i], &environ[i+1], (count-i)*sizeof(char *));
 653                         count--;
 654                 } else {
 655                         i++;
 656                 }
 657         }
 658
 659         return 0;
 660 }
 661 #endif
 662
 663 #ifndef HAVE_UTIME
 664 int rep_utime(const char *filename, const struct utimbuf *buf)
 665 {
 666         errno = ENOSYS;
 667         return -1;
 668 }
 669 #endif
 670
 671 #ifndef HAVE_UTIMES
 672 int rep_utimes(const char *filename, const struct timeval tv[2])
 673 {
 674         struct utimbuf u;
 675
 676         u.actime = tv[0].tv_sec;
 677         if (tv[0].tv_usec > 500000) {
 678                 u.actime += 1;
 679         }
 680
 681         u.modtime = tv[1].tv_sec;
 682         if (tv[1].tv_usec > 500000) {
 683                 u.modtime += 1;
 684         }
 685
 686         return utime(filename, &u);
 687 }
 688 #endif
 689
 690 #ifndef HAVE_DUP2
 691 int rep_dup2(int oldfd, int newfd)
 692 {
 693         errno = ENOSYS;
 694         return -1;
 695 }
 696 #endif
 697
 698 #ifndef HAVE_CHOWN
 699 /**
 700 chown isn't used much but OS/2 doesn't have it
 701 **/
 702 int rep_chown(const char *fname, uid_t uid, gid_t gid)
 703 {
 704         errno = ENOSYS;
 705         return -1;
 706 }
 707 #endif
 708
 709 #ifndef HAVE_LINK
 710 int rep_link(const char *oldpath, const char *newpath)
 711 {
 712         errno = ENOSYS;
 713         return -1;
 714 }
 715 #endif
 716
 717 #ifndef HAVE_READLINK
 718 int rep_readlink(const char *path, char *buf, size_t bufsiz)
 719 {
 720         errno = ENOSYS;
 721         return -1;
 722 }
 723 #endif
 724
 725 #ifndef HAVE_SYMLINK
 726 int rep_symlink(const char *oldpath, const char *newpath)
 727 {
 728         errno = ENOSYS;
 729         return -1;
 730 }
 731 #endif
 732
 733 #ifndef HAVE_LCHOWN
 734 int rep_lchown(const char *fname,uid_t uid,gid_t gid)
 735 {
 736         errno = ENOSYS;
 737         return -1;
 738 }
 739 #endif
 740
 741 #ifndef HAVE_REALPATH
 742 char *rep_realpath(const char *path, char *resolved_path)
 743 {
 744         /* As realpath is not a system call we can't return ENOSYS. */
 745         errno = EINVAL;
 746         return NULL;
 747 }
 748 #endif
 749
 750
 751 #ifndef HAVE_MEMMEM
 752 void *rep_memmem(const void *haystack, size_t haystacklen,
 753                  const void *needle, size_t needlelen)
 754 {
 755         if (needlelen == 0) {
 756                 return discard_const(haystack);
 757         }
 758         while (haystacklen >= needlelen) {
 759                 char *p = (char *)memchr(haystack, *(const char *)needle,
 760                                          haystacklen-(needlelen-1));
 761                 if (!p) return NULL;
 762                 if (memcmp(p, needle, needlelen) == 0) {
 763                         return p;
 764                 }
 765                 haystack = p+1;
 766                 haystacklen -= (p - (const char *)haystack) + 1;
 767         }
 768         return NULL;
 769 }
 770 #endif
 771
 772 #if !defined(HAVE_VDPRINTF) || !defined(HAVE_C99_VSNPRINTF)
 773 int rep_vdprintf(int fd, const char *format, va_list ap)
 774 {
 775         char *s = NULL;
 776         int ret;
 777
 778         vasprintf(&s, format, ap);
 779         if (s == NULL) {
 780                 errno = ENOMEM;
 781                 return -1;
 782         }
 783         ret = write(fd, s, strlen(s));
 784         free(s);
 785         return ret;
 786 }
 787 #endif
 788
 789 #if !defined(HAVE_DPRINTF) || !defined(HAVE_C99_VSNPRINTF)
 790 int rep_dprintf(int fd, const char *format, ...)
 791 {
 792         int ret;
 793         va_list ap;
 794
 795         va_start(ap, format);
 796         ret = vdprintf(fd, format, ap);
 797         va_end(ap);
 798
 799         return ret;
 800 }
 801 #endif
 802
 803 #ifndef HAVE_GET_CURRENT_DIR_NAME
 804 char *rep_get_current_dir_name(void)
 805 {
 806         char buf[PATH_MAX+1];
 807         char *p;
 808         p = getcwd(buf, sizeof(buf));
 809         if (p == NULL) {
 810                 return NULL;
 811         }
 812         return strdup(p);
 813 }
 814 #endif
 815
 816 #ifndef HAVE_STRERROR_R
 817 int rep_strerror_r(int errnum, char *buf, size_t buflen)
 818 {
 819         char *s = strerror(errnum);
 820         if (strlen(s)+1 > buflen) {
 821                 errno = ERANGE;
 822                 return -1;
 823         }
 824         strncpy(buf, s, buflen);
 825         return 0;
 826 }
 827 #elif (!defined(STRERROR_R_XSI_NOT_GNU))
 828 #undef strerror_r
 829 int rep_strerror_r(int errnum, char *buf, size_t buflen)
 830 {
 831         char *s = strerror_r(errnum, buf, buflen);
 832         if (s == NULL) {
 833                 /* Shouldn't happen, should always get a string */
 834                 return EINVAL;
 835         }
 836         if (s != buf) {
 837                 strlcpy(buf, s, buflen);
 838                 if (strlen(s) > buflen - 1) {
 839                         return ERANGE;
 840                 }
 841         }
 842         return 0;
 843
 844 }
 845 #endif
 846
 847 #ifndef HAVE_CLOCK_GETTIME
 848 int rep_clock_gettime(clockid_t clk_id, struct timespec *tp)
 849 {
 850         struct timeval tval;
 851         switch (clk_id) {
 852                 case 0: /* CLOCK_REALTIME :*/
 853 #if defined(HAVE_GETTIMEOFDAY_TZ) || defined(HAVE_GETTIMEOFDAY_TZ_VOID)
 854                         gettimeofday(&tval,NULL);
 855 #else
 856                         gettimeofday(&tval);
 857 #endif
 858                         tp->tv_sec = tval.tv_sec;
 859                         tp->tv_nsec = tval.tv_usec * 1000;
 860                         break;
 861                 default:
 862                         errno = EINVAL;
 863                         return -1;
 864         }
 865         return 0;
 866 }
 867 #endif
 868
 869 #ifndef HAVE_MEMALIGN
 870 void *rep_memalign( size_t align, size_t size )
 871 {
 872 #if defined(HAVE_POSIX_MEMALIGN)
 873         void *p = NULL;
 874         int ret = posix_memalign( &p, align, size );
 875         if ( ret == 0 )
 876                 return p;
 877
 878         return NULL;
 879 #else
 880         /* On *BSD systems memaligns doesn't exist, but memory will
 881          * be aligned on allocations of > pagesize. */
 882 #if defined(SYSCONF_SC_PAGESIZE)
 883         size_t pagesize = (size_t)sysconf(_SC_PAGESIZE);
 884 #elif defined(HAVE_GETPAGESIZE)
 885         size_t pagesize = (size_t)getpagesize();
 886 #else
 887         size_t pagesize = (size_t)-1;
 888 #endif
 889         if (pagesize == (size_t)-1) {
 890                 errno = ENOSYS;
 891                 return NULL;
 892         }
 893         if (size < pagesize) {
 894                 size = pagesize;
 895         }
 896         return malloc(size);
 897 #endif
 898 }
 899 #endif
 900
 901 #ifndef HAVE_GETPEEREID
 902 int rep_getpeereid(int s, uid_t *uid, gid_t *gid)
 903 {
 904 #if defined(HAVE_PEERCRED)
 905         struct ucred cred;
 906         socklen_t cred_len = sizeof(struct ucred);
 907         int ret;
 908
 909 #undef getsockopt
 910         ret = getsockopt(s, SOL_SOCKET, SO_PEERCRED, (void *)&cred, &cred_len);
 911         if (ret != 0) {
 912                 return -1;
 913         }
 914
 915         if (cred_len != sizeof(struct ucred)) {
 916                 errno = EINVAL;
 917                 return -1;
 918         }
 919
 920         *uid = cred.uid;
 921         *gid = cred.gid;
 922         return 0;
 923 #else
 924         errno = ENOSYS;
 925         return -1;
 926 #endif
 927 }
 928 #endif
 929
 930 #ifndef HAVE_USLEEP
 931 int rep_usleep(useconds_t sec)
 932 {
 933         struct timeval tval;
 934         /*
 935          * Fake it with select...
 936          */
 937         tval.tv_sec = 0;
 938         tval.tv_usec = usecs/1000;
 939         select(0,NULL,NULL,NULL,&tval);
 940         return 0;
 941 }
 942 #endif /* HAVE_USLEEP */
 943
 944 #ifndef HAVE_SETPROCTITLE
 945 void rep_setproctitle(const char *fmt, ...)
 946 {
 947 }
 948 #endif
 949 #ifndef HAVE_SETPROCTITLE_INIT
 950 void rep_setproctitle_init(int argc, char *argv[], char *envp[])
 951 {
 952 }
 953 #endif
 954
 955 #ifndef HAVE_MEMSET_S
 956 # ifndef RSIZE_MAX
 957 #  define RSIZE_MAX (SIZE_MAX >> 1)
 958 # endif
 959
 960 int rep_memset_s(void *dest, size_t destsz, int ch, size_t count)
 961 {
 962         if (dest == NULL) {
 963                 return EINVAL;
 964         }
 965
 966         if (destsz > RSIZE_MAX ||
 967             count > RSIZE_MAX ||
 968             count > destsz) {
 969                 return ERANGE;
 970         }
 971
 972 #if defined(HAVE_MEMSET_EXPLICIT)
 973         memset_explicit(dest, destsz, ch, count);
 974 #else /* HAVE_MEMSET_EXPLICIT */
 975         memset(dest, ch, count);
 976 # if defined(HAVE_GCC_VOLATILE_MEMORY_PROTECTION)
 977         /* See http://llvm.org/bugs/show_bug.cgi?id=15495 */
 978         __asm__ volatile("" : : "g"(dest) : "memory");
 979 # endif /* HAVE_GCC_VOLATILE_MEMORY_PROTECTION */
 980 #endif /* HAVE_MEMSET_EXPLICIT */
 981
 982         return 0;
 983 }
 984 #endif /* HAVE_MEMSET_S */
 985
 986 #ifndef HAVE_GETPROGNAME
 987 # ifndef HAVE_PROGRAM_INVOCATION_SHORT_NAME
 988 # define PROGNAME_SIZE 32
 989 static char rep_progname[PROGNAME_SIZE];
 990 # endif /* HAVE_PROGRAM_INVOCATION_SHORT_NAME */
 991
 992 const char *rep_getprogname(void)
 993 {
 994 #ifdef HAVE_PROGRAM_INVOCATION_SHORT_NAME
 995         return program_invocation_short_name;
 996 #else /* HAVE_PROGRAM_INVOCATION_SHORT_NAME */
 997         FILE *fp = NULL;
 998         char cmdline[4096] = {0};
 999         char *p = NULL;
1000         pid_t pid;
1001         size_t nread;
1002         int len;
1003         int rc;
1004
1005         if (rep_progname[0] != '\0') {
1006                 return rep_progname;
1007         }
1008
1009         len = snprintf(rep_progname, sizeof(rep_progname), "%s", "<unknown>");
1010         if (len <= 0) {
1011                 return NULL;
1012         }
1013
1014         pid = getpid();
1015         if (pid <= 1 || pid == (pid_t)-1) {
1016                 return NULL;
1017         }
1018
1019         len = snprintf(cmdline,
1020                        sizeof(cmdline),
1021                        "/proc/%u/cmdline",
1022                        (unsigned int)pid);
1023         if (len <= 0 || len == sizeof(cmdline)) {
1024                 return NULL;
1025         }
1026
1027         fp = fopen(cmdline, "r");
1028         if (fp == NULL) {
1029                 return NULL;
1030         }
1031
1032         nread = fread(cmdline, 1, sizeof(cmdline) - 1, fp);
1033
1034         rc = fclose(fp);
1035         if (rc != 0) {
1036                 return NULL;
1037         }
1038
1039         if (nread == 0) {
1040                 return NULL;
1041         }
1042
1043         cmdline[nread] = '\0';
1044
1045         p = strrchr(cmdline, '/');
1046         if (p != NULL) {
1047                 p++;
1048         } else {
1049                 p = cmdline;
1050         }
1051
1052         len = strlen(p);
1053         if (len > PROGNAME_SIZE) {
1054                 p[PROGNAME_SIZE - 1] = '\0';
1055         }
1056
1057         (void)snprintf(rep_progname, sizeof(rep_progname), "%s", p);
1058
1059         return rep_progname;
1060 #endif /* HAVE_PROGRAM_INVOCATION_SHORT_NAME */
1061 }
1062 #endif /* HAVE_GETPROGNAME */
1063
1064 #ifndef HAVE_COPY_FILE_RANGE
1065 ssize_t rep_copy_file_range(int fd_in,
1066                             loff_t *off_in,
1067                             int fd_out,
1068                             loff_t *off_out,
1069                             size_t len,
1070                             unsigned int flags)
1071 {
1072 # ifdef HAVE_SYSCALL_COPY_FILE_RANGE
1073         return syscall(__NR_copy_file_range,
1074                        fd_in,
1075                        off_in,
1076                        fd_out,
1077                        off_out,
1078                        len,
1079                        flags);
1080 # endif /* HAVE_SYSCALL_COPY_FILE_RANGE */
1081         errno = ENOSYS;
1082         return -1;
1083 }
1084 #endif /* HAVE_COPY_FILE_RANGE */
1085
1086 #ifndef HAVE_OPENAT2
1087
1088 /* fallback known wellknown __NR_openat2 values */
1089 #ifndef __NR_openat2
1090 # if defined(LINUX) && defined(HAVE_SYS_SYSCALL_H)
1091 #  if defined(__i386__)
1092 #   define __NR_openat2 437
1093 #  elif defined(__x86_64__) && defined(__LP64__)
1094 #   define __NR_openat2 437 /* 437 0x1B5 */
1095 #  elif defined(__x86_64__) && defined(__ILP32__)
1096 #   define __NR_openat2 1073742261 /* 1073742261 0x400001B5 */
1097 #  elif defined(__aarch64__)
1098 #   define __NR_openat2 437
1099 #  elif defined(__arm__)
1100 #   define __NR_openat2 437
1101 #  elif defined(__sparc__)
1102 #   define __NR_openat2 437
1103 #  endif
1104 # endif /* defined(LINUX) && defined(HAVE_SYS_SYSCALL_H) */
1105 #endif /* !__NR_openat2 */
1106
1107 #ifdef DISABLE_OPATH
1108 /*
1109  * systems without O_PATH also don't have openat2,
1110  * so make sure we at a realistic combination.
1111  */
1112 #undef __NR_openat2
1113 #endif /* DISABLE_OPATH */
1114
1115 long rep_openat2(int dirfd, const char *pathname,
1116                  struct open_how *how, size_t size)
1117 {
1118 #ifdef __NR_openat2
1119         return syscall(__NR_openat2,
1120                        dirfd,
1121                        pathname,
1122                        how,
1123                        size);
1124 #else
1125         errno = ENOSYS;
1126         return -1;
1127 #endif
1128 }
1129 #endif /* !HAVE_OPENAT2 */