nis/nss_compat/compat-grp.c

   1 /* Copyright (C) 1996,1997,1998,1999,2001,2002 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Thorsten Kukuk <kukuk@suse.de>, 1996.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <errno.h>
  21 #include <fcntl.h>
  22 #include <nss.h>
  23 #include <grp.h>
  24 #include <ctype.h>
  25 #include <bits/libc-lock.h>
  26 #include <string.h>
  27 #include <rpcsvc/yp.h>
  28 #include <rpcsvc/ypclnt.h>
  29 #include <rpcsvc/nis.h>
  30 #include <nsswitch.h>
  31
  32 #include "nss-nisplus.h"
  33 #include "nisplus-parser.h"
  34
  35 static service_user *ni;
  36 static bool_t use_nisplus; /* default: group_compat: nis */
  37 static nis_name grptable; /* Name of the group table */
  38 static size_t grptablelen;
  39
  40 /* Get the declaration of the parser function.  */
  41 #define ENTNAME grent
  42 #define STRUCTURE group
  43 #define EXTERN_PARSER
  44 #include <nss/nss_files/files-parse.c>
  45
  46 /* Structure for remembering -group members ... */
  47 #define BLACKLIST_INITIAL_SIZE 512
  48 #define BLACKLIST_INCREMENT 256
  49 struct blacklist_t
  50   {
  51     char *data;
  52     int current;
  53     int size;
  54   };
  55
  56 struct ent_t
  57   {
  58     bool_t nis;
  59     bool_t nis_first;
  60     char *oldkey;
  61     int oldkeylen;
  62     nis_result *result;
  63     FILE *stream;
  64     struct blacklist_t blacklist;
  65 };
  66 typedef struct ent_t ent_t;
  67
  68 static ent_t ext_ent = {0, 0, NULL, 0, NULL, NULL, {NULL, 0, 0}};
  69
  70 /* Protect global state against multiple changers.  */
  71 __libc_lock_define_initialized (static, lock)
  72
  73 /* Prototypes for local functions.  */
  74 static void blacklist_store_name (const char *, ent_t *);
  75 static int in_blacklist (const char *, int, ent_t *);
  76
  77 static enum nss_status
  78 _nss_first_init (void)
  79 {
  80   if (ni == NULL)
  81     {
  82       __nss_database_lookup ("group_compat", NULL, "nis", &ni);
  83       use_nisplus = (strcmp (ni->name, "nisplus") == 0);
  84     }
  85
  86   if (grptable == NULL)
  87     {
  88       static const char key[] = "group.org_dir.";
  89       const char *local_dir = nis_local_directory ();
  90       size_t len_local_dir = strlen (local_dir);
  91
  92       grptable = malloc (sizeof (key) + len_local_dir);
  93       if (grptable == NULL)
  94         return NSS_STATUS_TRYAGAIN;
  95
  96       grptablelen = ((char *) mempcpy (mempcpy (grptable,
  97                                                 key, sizeof (key) - 1),
  98                                        local_dir, len_local_dir + 1)
  99                      - grptable) - 1;
 100     }
 101
 102   return NSS_STATUS_SUCCESS;
 103 }
 104
 105 static enum nss_status
 106 internal_setgrent (ent_t *ent)
 107 {
 108   enum nss_status status = NSS_STATUS_SUCCESS;
 109
 110   ent->nis = ent->nis_first = 0;
 111
 112   if (_nss_first_init () != NSS_STATUS_SUCCESS)
 113     return NSS_STATUS_UNAVAIL;
 114
 115   if (ent->oldkey != NULL)
 116     {
 117       free (ent->oldkey);
 118       ent->oldkey = NULL;
 119       ent->oldkeylen = 0;
 120     }
 121
 122   if (ent->result != NULL)
 123     {
 124       nis_freeresult (ent->result);
 125       ent->result = NULL;
 126     }
 127
 128   if (ent->blacklist.data != NULL)
 129     {
 130       ent->blacklist.current = 1;
 131       ent->blacklist.data[0] = '|';
 132       ent->blacklist.data[1] = '\0';
 133     }
 134   else
 135     ent->blacklist.current = 0;
 136
 137   if (ent->stream == NULL)
 138     {
 139       ent->stream = fopen ("/etc/group", "r");
 140
 141       if (ent->stream == NULL)
 142         status = errno == EAGAIN ? NSS_STATUS_TRYAGAIN : NSS_STATUS_UNAVAIL;
 143       else
 144         {
 145           /* We have to make sure the file is  `closed on exec'.  */
 146           int result, flags;
 147
 148           result = flags = fcntl (fileno (ent->stream), F_GETFD, 0);
 149           if (result >= 0)
 150             {
 151               flags |= FD_CLOEXEC;
 152               result = fcntl (fileno (ent->stream), F_SETFD, flags);
 153             }
 154           if (result < 0)
 155             {
 156               /* Something went wrong.  Close the stream and return a
 157                  failure.  */
 158               fclose (ent->stream);
 159               ent->stream = NULL;
 160               status = NSS_STATUS_UNAVAIL;
 161             }
 162         }
 163     }
 164   else
 165     rewind (ent->stream);
 166
 167   return status;
 168 }
 169
 170
 171 enum nss_status
 172 _nss_compat_setgrent (int stayopen)
 173 {
 174   enum nss_status result;
 175
 176   __libc_lock_lock (lock);
 177
 178   result = internal_setgrent (&ext_ent);
 179
 180   __libc_lock_unlock (lock);
 181
 182   return result;
 183 }
 184
 185
 186 static enum nss_status
 187 internal_endgrent (ent_t *ent)
 188 {
 189   if (ent->stream != NULL)
 190     {
 191       fclose (ent->stream);
 192       ent->stream = NULL;
 193     }
 194
 195   ent->nis = ent->nis_first = 0;
 196
 197   if (ent->oldkey != NULL)
 198     {
 199       free (ent->oldkey);
 200       ent->oldkey = NULL;
 201       ent->oldkeylen = 0;
 202     }
 203
 204   if (ent->result != NULL)
 205     {
 206       nis_freeresult (ent->result);
 207       ent->result = NULL;
 208     }
 209
 210   if (ent->blacklist.data != NULL)
 211     {
 212       ent->blacklist.current = 1;
 213       ent->blacklist.data[0] = '|';
 214       ent->blacklist.data[1] = '\0';
 215     }
 216   else
 217     ent->blacklist.current = 0;
 218
 219   return NSS_STATUS_SUCCESS;
 220 }
 221
 222 enum nss_status
 223 _nss_compat_endgrent (void)
 224 {
 225   enum nss_status result;
 226
 227   __libc_lock_lock (lock);
 228
 229   result = internal_endgrent (&ext_ent);
 230
 231   __libc_lock_unlock (lock);
 232
 233   return result;
 234 }
 235
 236 static enum nss_status
 237 getgrent_next_nis (struct group *result, ent_t *ent, char *buffer,
 238                    size_t buflen, int *errnop)
 239 {
 240   struct parser_data *data = (void *) buffer;
 241   char *domain;
 242   char *outkey, *outval;
 243   int outkeylen, outvallen, parse_res;
 244   char *p;
 245
 246   if (yp_get_default_domain (&domain) != YPERR_SUCCESS)
 247     {
 248       ent->nis = 0;
 249       return NSS_STATUS_NOTFOUND;
 250     }
 251
 252   do
 253     {
 254       char *save_oldkey;
 255       int save_oldlen;
 256       bool_t save_nis_first;
 257
 258       if (ent->nis_first)
 259         {
 260           if (yp_first (domain, "group.byname", &outkey, &outkeylen,
 261                         &outval, &outvallen) != YPERR_SUCCESS)
 262             {
 263               ent->nis = 0;
 264               return NSS_STATUS_UNAVAIL;
 265             }
 266
 267           if ( buflen < ((size_t) outvallen + 1))
 268             {
 269               free (outval);
 270               *errnop = ERANGE;
 271               return NSS_STATUS_TRYAGAIN;
 272             }
 273
 274           save_oldkey = ent->oldkey;
 275           save_oldlen = ent->oldkeylen;
 276           save_nis_first = TRUE;
 277           ent->oldkey = outkey;
 278           ent->oldkeylen = outkeylen;
 279           ent->nis_first = FALSE;
 280         }
 281       else
 282         {
 283           if (yp_next (domain, "group.byname", ent->oldkey, ent->oldkeylen,
 284                        &outkey, &outkeylen, &outval, &outvallen)
 285               != YPERR_SUCCESS)
 286             {
 287               ent->nis = 0;
 288               return NSS_STATUS_NOTFOUND;
 289             }
 290
 291           if ( buflen < ((size_t) outvallen + 1))
 292             {
 293               free (outval);
 294               *errnop = ERANGE;
 295               return NSS_STATUS_TRYAGAIN;
 296             }
 297
 298           save_oldkey = ent->oldkey;
 299           save_oldlen = ent->oldkeylen;
 300           save_nis_first = FALSE;
 301           ent->oldkey = outkey;
 302           ent->oldkeylen = outkeylen;
 303         }
 304
 305       /* Copy the found data to our buffer...  */
 306       p = strncpy (buffer, outval, buflen);
 307
 308       /* ...and free the data.  */
 309       free (outval);
 310
 311       while (isspace (*p))
 312         ++p;
 313
 314       parse_res = _nss_files_parse_grent (p, result, data, buflen, errnop);
 315       if (parse_res == -1)
 316         {
 317           free (ent->oldkey);
 318           ent->oldkey = save_oldkey;
 319           ent->oldkeylen = save_oldlen;
 320           ent->nis_first = save_nis_first;
 321           *errnop = ERANGE;
 322           return NSS_STATUS_TRYAGAIN;
 323         }
 324       else
 325         {
 326           if (!save_nis_first)
 327             free (save_oldkey);
 328         }
 329
 330       if (parse_res &&
 331           in_blacklist (result->gr_name, strlen (result->gr_name), ent))
 332         parse_res = 0; /* if result->gr_name in blacklist,search next entry */
 333     }
 334   while (!parse_res);
 335
 336   return NSS_STATUS_SUCCESS;
 337 }
 338
 339 static enum nss_status
 340 getgrent_next_nisplus (struct group *result, ent_t *ent, char *buffer,
 341                        size_t buflen, int *errnop)
 342 {
 343   int parse_res;
 344
 345   do
 346     {
 347       nis_result *save_oldres;
 348       bool_t save_nis_first;
 349
 350       if (ent->nis_first)
 351         {
 352           save_oldres = ent->result;
 353           save_nis_first = TRUE;
 354           ent->result = nis_first_entry(grptable);
 355           if (niserr2nss (ent->result->status) != NSS_STATUS_SUCCESS)
 356             {
 357               ent->nis = 0;
 358               return niserr2nss (ent->result->status);
 359             }
 360           ent->nis_first = FALSE;
 361         }
 362       else
 363         {
 364           nis_result *res;
 365
 366           save_oldres = ent->result;
 367           save_nis_first = FALSE;
 368           res = nis_next_entry(grptable, &ent->result->cookie);
 369           ent->result = res;
 370           if (niserr2nss (ent->result->status) != NSS_STATUS_SUCCESS)
 371             {
 372               ent->nis = 0;
 373               return niserr2nss (ent->result->status);
 374             }
 375         }
 376       parse_res = _nss_nisplus_parse_grent (ent->result, 0, result,
 377                                             buffer, buflen, errnop);
 378       if (parse_res == -1)
 379         {
 380           nis_freeresult (ent->result);
 381           ent->result = save_oldres;
 382           ent->nis_first = save_nis_first;
 383           *errnop = ERANGE;
 384           return NSS_STATUS_TRYAGAIN;
 385         }
 386       else
 387         {
 388           if (!save_nis_first)
 389             nis_freeresult (save_oldres);
 390         }
 391
 392       if (parse_res &&
 393           in_blacklist (result->gr_name, strlen (result->gr_name), ent))
 394         parse_res = 0; /* if result->gr_name in blacklist,search next entry */
 395     }
 396   while (!parse_res);
 397
 398   return NSS_STATUS_SUCCESS;
 399 }
 400
 401 /* This function handle the +group entrys in /etc/group */
 402 static enum nss_status
 403 getgrnam_plusgroup (const char *name, struct group *result, char *buffer,
 404                     size_t buflen, int *errnop)
 405 {
 406   struct parser_data *data = (void *) buffer;
 407   int parse_res;
 408
 409   if (use_nisplus) /* Do the NIS+ query here */
 410     {
 411       nis_result *res;
 412       char buf[strlen (name) + 24 + grptablelen];
 413
 414       sprintf(buf, "[name=%s],%s", name, grptable);
 415       res = nis_list(buf, FOLLOW_PATH | FOLLOW_LINKS, NULL, NULL);
 416       if (niserr2nss (res->status) != NSS_STATUS_SUCCESS)
 417         {
 418           enum nss_status status =  niserr2nss (res->status);
 419
 420           nis_freeresult (res);
 421           return status;
 422         }
 423       parse_res = _nss_nisplus_parse_grent (res, 0, result, buffer, buflen,
 424                                             errnop);
 425       if (parse_res == -1)
 426         {
 427           nis_freeresult (res);
 428           *errnop = ERANGE;
 429           return NSS_STATUS_TRYAGAIN;
 430         }
 431       nis_freeresult (res);
 432     }
 433   else /* Use NIS */
 434     {
 435       char *domain, *outval, *p;
 436       int outvallen;
 437
 438       if (yp_get_default_domain (&domain) != YPERR_SUCCESS)
 439         return NSS_STATUS_NOTFOUND;
 440
 441       if (yp_match (domain, "group.byname", name, strlen (name),
 442                     &outval, &outvallen) != YPERR_SUCCESS)
 443         return NSS_STATUS_NOTFOUND;
 444
 445       if (buflen < ((size_t) outvallen + 1))
 446         {
 447           free (outval);
 448           *errnop = ERANGE;
 449           return NSS_STATUS_TRYAGAIN;
 450         }
 451
 452       /* Copy the found data to our buffer...  */
 453       p = strncpy (buffer, outval, buflen);
 454
 455       /* ... and free the data.  */
 456       free (outval);
 457       while (isspace (*p))
 458         ++p;
 459       parse_res = _nss_files_parse_grent (p, result, data, buflen, errnop);
 460       if (parse_res == -1)
 461         return NSS_STATUS_TRYAGAIN;
 462     }
 463
 464   if (parse_res)
 465     /* We found the entry.  */
 466     return NSS_STATUS_SUCCESS;
 467   else
 468     return NSS_STATUS_RETURN;
 469 }
 470
 471 static enum nss_status
 472 getgrent_next_file (struct group *result, ent_t *ent,
 473                     char *buffer, size_t buflen, int *errnop)
 474 {
 475   struct parser_data *data = (void *) buffer;
 476   while (1)
 477     {
 478       fpos_t pos;
 479       int parse_res = 0;
 480       char *p;
 481
 482       do
 483         {
 484           fgetpos (ent->stream, &pos);
 485           buffer[buflen - 1] = '\xff';
 486           p = fgets (buffer, buflen, ent->stream);
 487           if (p == NULL && feof (ent->stream))
 488             return NSS_STATUS_NOTFOUND;
 489
 490           if (p == NULL || buffer[buflen - 1] != '\xff')
 491             {
 492               fsetpos (ent->stream, &pos);
 493               *errnop = ERANGE;
 494               return NSS_STATUS_TRYAGAIN;
 495             }
 496
 497           /* Terminate the line for any case.  */
 498           buffer[buflen - 1] = '\0';
 499
 500           /* Skip leading blanks.  */
 501           while (isspace (*p))
 502             ++p;
 503         }
 504       while (*p == '\0' || *p == '#' || /* Ignore empty and comment lines. */
 505       /* Parse the line.  If it is invalid, loop to
 506          get the next line of the file to parse.  */
 507              !(parse_res = _nss_files_parse_grent (p, result, data, buflen,
 508                                                    errnop)));
 509
 510       if (parse_res == -1)
 511         {
 512           /* The parser ran out of space.  */
 513           fsetpos (ent->stream, &pos);
 514           *errnop = ERANGE;
 515           return NSS_STATUS_TRYAGAIN;
 516         }
 517
 518       if (result->gr_name[0] != '+' && result->gr_name[0] != '-')
 519         /* This is a real entry.  */
 520         break;
 521
 522       /* -group */
 523       if (result->gr_name[0] == '-' && result->gr_name[1] != '\0'
 524           && result->gr_name[1] != '@')
 525         {
 526           blacklist_store_name (&result->gr_name[1], ent);
 527           continue;
 528         }
 529
 530       /* +group */
 531       if (result->gr_name[0] == '+' && result->gr_name[1] != '\0'
 532           && result->gr_name[1] != '@')
 533         {
 534           enum nss_status status;
 535
 536           /* Store the group in the blacklist for the "+" at the end of
 537              /etc/group */
 538           blacklist_store_name (&result->gr_name[1], ent);
 539           status = getgrnam_plusgroup (&result->gr_name[1], result, buffer,
 540                                        buflen, errnop);
 541           if (status == NSS_STATUS_SUCCESS) /* We found the entry. */
 542             break;
 543           else
 544             if (status == NSS_STATUS_RETURN /* We couldn't parse the entry */
 545                 || status == NSS_STATUS_NOTFOUND) /* No group in NIS */
 546               continue;
 547             else
 548               {
 549                 if (status == NSS_STATUS_TRYAGAIN)
 550                   {
 551                     /* The parser ran out of space.  */
 552                     fsetpos (ent->stream, &pos);
 553                     *errnop = ERANGE;
 554                   }
 555                 return status;
 556               }
 557         }
 558
 559       /* +:... */
 560       if (result->gr_name[0] == '+' && result->gr_name[1] == '\0')
 561         {
 562           ent->nis = TRUE;
 563           ent->nis_first = TRUE;
 564
 565           if (use_nisplus)
 566             return getgrent_next_nisplus (result, ent, buffer, buflen, errnop);
 567           else
 568             return getgrent_next_nis (result, ent, buffer, buflen, errnop);
 569         }
 570     }
 571
 572   return NSS_STATUS_SUCCESS;
 573 }
 574
 575
 576 static enum nss_status
 577 internal_getgrent_r (struct group *gr, ent_t *ent, char *buffer,
 578                      size_t buflen, int *errnop)
 579 {
 580   if (ent->nis)
 581     {
 582       if (use_nisplus)
 583         return getgrent_next_nisplus (gr, ent, buffer, buflen, errnop);
 584       else
 585         return getgrent_next_nis (gr, ent, buffer, buflen, errnop);
 586     }
 587   else
 588     return getgrent_next_file (gr, ent, buffer, buflen, errnop);
 589 }
 590
 591 enum nss_status
 592 _nss_compat_getgrent_r (struct group *grp, char *buffer, size_t buflen,
 593                         int *errnop)
 594 {
 595   enum nss_status status = NSS_STATUS_SUCCESS;
 596
 597   __libc_lock_lock (lock);
 598
 599   /* Be prepared that the setgrent function was not called before.  */
 600   if (ext_ent.stream == NULL)
 601     status = internal_setgrent (&ext_ent);
 602
 603   if (status == NSS_STATUS_SUCCESS)
 604     status = internal_getgrent_r (grp, &ext_ent, buffer, buflen, errnop);
 605
 606   __libc_lock_unlock (lock);
 607
 608   return status;
 609 }
 610
 611 /* Searches in /etc/group and the NIS/NIS+ map for a special group */
 612 static enum nss_status
 613 internal_getgrnam_r (const char *name, struct group *result, ent_t *ent,
 614                      char *buffer, size_t buflen, int *errnop)
 615 {
 616   struct parser_data *data = (void *) buffer;
 617   while (1)
 618     {
 619       fpos_t pos;
 620       int parse_res = 0;
 621       char *p;
 622
 623       do
 624         {
 625           fgetpos (ent->stream, &pos);
 626           buffer[buflen - 1] = '\xff';
 627           p = fgets (buffer, buflen, ent->stream);
 628           if (p == NULL && feof (ent->stream))
 629               return NSS_STATUS_NOTFOUND;
 630
 631           if (p == NULL || buffer[buflen - 1] != '\xff')
 632             {
 633               fsetpos (ent->stream, &pos);
 634               *errnop = ERANGE;
 635               return NSS_STATUS_TRYAGAIN;
 636             }
 637
 638           /* Terminate the line for any case.  */
 639           buffer[buflen - 1] = '\0';
 640
 641           /* Skip leading blanks.  */
 642           while (isspace (*p))
 643             ++p;
 644         }
 645       while (*p == '\0' || *p == '#' || /* Ignore empty and comment lines. */
 646       /* Parse the line.  If it is invalid, loop to
 647          get the next line of the file to parse.  */
 648              !(parse_res = _nss_files_parse_grent (p, result, data, buflen,
 649                                                    errnop)));
 650
 651       if (parse_res == -1)
 652         {
 653           /* The parser ran out of space.  */
 654           fsetpos (ent->stream, &pos);
 655           *errnop = ERANGE;
 656           return NSS_STATUS_TRYAGAIN;
 657         }
 658
 659       /* This is a real entry.  */
 660       if (result->gr_name[0] != '+' && result->gr_name[0] != '-')
 661         {
 662           if (strcmp (result->gr_name, name) == 0)
 663             return NSS_STATUS_SUCCESS;
 664           else
 665             continue;
 666         }
 667
 668       /* -group */
 669       if (result->gr_name[0] == '-' && result->gr_name[1] != '\0')
 670         {
 671           if (strcmp (&result->gr_name[1], name) == 0)
 672             return NSS_STATUS_NOTFOUND;
 673           else
 674             continue;
 675         }
 676
 677       /* +group */
 678       if (result->gr_name[0] == '+' && result->gr_name[1] != '\0')
 679         {
 680           if (strcmp (name, &result->gr_name[1]) == 0)
 681             {
 682               enum nss_status status;
 683
 684               status = getgrnam_plusgroup (name, result, buffer, buflen,
 685                                            errnop);
 686               if (status == NSS_STATUS_RETURN)
 687                 /* We couldn't parse the entry */
 688                 continue;
 689               else
 690                 return status;
 691             }
 692         }
 693       /* +:... */
 694       if (result->gr_name[0] == '+' && result->gr_name[1] == '\0')
 695         {
 696           enum nss_status status;
 697
 698           status = getgrnam_plusgroup (name, result, buffer, buflen, errnop);
 699           if (status == NSS_STATUS_RETURN)
 700             /* We couldn't parse the entry */
 701             continue;
 702           else
 703             return status;
 704         }
 705     }
 706
 707   return NSS_STATUS_SUCCESS;
 708 }
 709
 710 enum nss_status
 711 _nss_compat_getgrnam_r (const char *name, struct group *grp,
 712                         char *buffer, size_t buflen, int *errnop)
 713 {
 714   ent_t ent = {0, 0, NULL, 0, NULL, NULL, {NULL, 0, 0}};
 715   enum nss_status status;
 716
 717   if (name[0] == '-' || name[0] == '+')
 718     return NSS_STATUS_NOTFOUND;
 719
 720   __libc_lock_lock (lock);
 721
 722   status = internal_setgrent (&ent);
 723
 724   __libc_lock_unlock (lock);
 725
 726   if (status != NSS_STATUS_SUCCESS)
 727     return status;
 728
 729   status = internal_getgrnam_r (name, grp, &ent, buffer, buflen, errnop);
 730
 731   internal_endgrent (&ent);
 732
 733   return status;
 734 }
 735
 736 /* This function handle the + entry in /etc/group */
 737 static enum nss_status
 738 getgrgid_plusgroup (gid_t gid, struct group *result, char *buffer,
 739                     size_t buflen, int *errnop)
 740 {
 741   struct parser_data *data = (void *) buffer;
 742   int parse_res;
 743
 744   if (use_nisplus) /* Do the NIS+ query here */
 745     {
 746       nis_result *res;
 747       char buf[24 + grptablelen];
 748
 749       sprintf(buf, "[gid=%lu],%s", (unsigned long int) gid, grptable);
 750       res = nis_list(buf, FOLLOW_PATH | FOLLOW_LINKS, NULL, NULL);
 751       if (niserr2nss (res->status) != NSS_STATUS_SUCCESS)
 752         {
 753           enum nss_status status =  niserr2nss (res->status);
 754
 755           nis_freeresult (res);
 756           return status;
 757         }
 758       if ((parse_res = _nss_nisplus_parse_grent (res, 0, result, buffer,
 759                                                  buflen, errnop)) == -1)
 760         {
 761           nis_freeresult (res);
 762           *errnop = ERANGE;
 763           return NSS_STATUS_TRYAGAIN;
 764         }
 765       nis_freeresult (res);
 766     }
 767   else /* Use NIS */
 768     {
 769       char buf[24];
 770       char *domain, *outval, *p;
 771       int outvallen;
 772
 773       if (yp_get_default_domain (&domain) != YPERR_SUCCESS)
 774         return NSS_STATUS_NOTFOUND;
 775
 776       snprintf (buf, sizeof (buf), "%lu", (unsigned long int) gid);
 777
 778       if (yp_match (domain, "group.bygid", buf, strlen (buf),
 779                     &outval, &outvallen) != YPERR_SUCCESS)
 780         return NSS_STATUS_NOTFOUND;
 781
 782       if (buflen < ((size_t) outvallen + 1))
 783         {
 784           free (outval);
 785           *errnop = ERANGE;
 786           return NSS_STATUS_TRYAGAIN;
 787         }
 788
 789       /* Copy the found data to our buffer...  */
 790       p = strncpy (buffer, outval, buflen);
 791
 792       /* ... and free the data.  */
 793       free (outval);
 794
 795       while (isspace (*p))
 796         p++;
 797       parse_res = _nss_files_parse_grent (p, result, data, buflen, errnop);
 798       if (parse_res == -1)
 799         return NSS_STATUS_TRYAGAIN;
 800     }
 801
 802   if (parse_res)
 803     /* We found the entry.  */
 804     return NSS_STATUS_SUCCESS;
 805   else
 806     return NSS_STATUS_RETURN;
 807 }
 808
 809 /* Searches in /etc/group and the NIS/NIS+ map for a special group id */
 810 static enum nss_status
 811 internal_getgrgid_r (gid_t gid, struct group *result, ent_t *ent,
 812                      char *buffer, size_t buflen, int *errnop)
 813 {
 814   struct parser_data *data = (void *) buffer;
 815   while (1)
 816     {
 817       fpos_t pos;
 818       int parse_res = 0;
 819       char *p;
 820
 821       do
 822         {
 823           fgetpos (ent->stream, &pos);
 824           buffer[buflen - 1] = '\xff';
 825           p = fgets (buffer, buflen, ent->stream);
 826           if (p == NULL && feof (ent->stream))
 827             return NSS_STATUS_NOTFOUND;
 828
 829           if (p == NULL || buffer[buflen - 1] != '\xff')
 830             {
 831               fsetpos (ent->stream, &pos);
 832               *errnop = ERANGE;
 833               return NSS_STATUS_TRYAGAIN;
 834             }
 835
 836           /* Terminate the line for any case.  */
 837           buffer[buflen - 1] = '\0';
 838
 839           /* Skip leading blanks.  */
 840           while (isspace (*p))
 841             ++p;
 842         }
 843       while (*p == '\0' || *p == '#' || /* Ignore empty and comment lines. */
 844       /* Parse the line.  If it is invalid, loop to
 845          get the next line of the file to parse.  */
 846              !(parse_res = _nss_files_parse_grent (p, result, data, buflen,
 847                                                    errnop)));
 848
 849       if (parse_res == -1)
 850         {
 851           /* The parser ran out of space.  */
 852           fsetpos (ent->stream, &pos);
 853           *errnop = ERANGE;
 854           return NSS_STATUS_TRYAGAIN;
 855         }
 856
 857       /* This is a real entry.  */
 858       if (result->gr_name[0] != '+' && result->gr_name[0] != '-')
 859         {
 860           if (result->gr_gid == gid)
 861             return NSS_STATUS_SUCCESS;
 862           else
 863             continue;
 864         }
 865
 866       /* -group */
 867       if (result->gr_name[0] == '-' && result->gr_name[1] != '\0')
 868         {
 869           blacklist_store_name (&result->gr_name[1], ent);
 870           continue;
 871         }
 872
 873       /* +group */
 874       if (result->gr_name[0] == '+' && result->gr_name[1] != '\0')
 875         {
 876           enum nss_status status;
 877
 878           /* Store the group in the blacklist for the "+" at the end of
 879              /etc/group */
 880           blacklist_store_name (&result->gr_name[1], ent);
 881           status = getgrnam_plusgroup (&result->gr_name[1], result, buffer,
 882                                       buflen, errnop);
 883           if (status == NSS_STATUS_SUCCESS && result->gr_gid == gid)
 884             break;
 885           else
 886             continue;
 887         }
 888       /* +:... */
 889       if (result->gr_name[0] == '+' && result->gr_name[1] == '\0')
 890         {
 891           enum nss_status status;
 892
 893           status = getgrgid_plusgroup (gid, result, buffer, buflen, errnop);
 894           if (status == NSS_STATUS_RETURN) /* We couldn't parse the entry */
 895             return NSS_STATUS_NOTFOUND;
 896           else
 897             return status;
 898         }
 899     }
 900
 901   return NSS_STATUS_SUCCESS;
 902 }
 903
 904 enum nss_status
 905 _nss_compat_getgrgid_r (gid_t gid, struct group *grp,
 906                         char *buffer, size_t buflen, int *errnop)
 907 {
 908   ent_t ent = {0, 0, NULL, 0, NULL, NULL, {NULL, 0, 0}};
 909   enum nss_status status;
 910
 911   __libc_lock_lock (lock);
 912
 913   status = internal_setgrent (&ent);
 914
 915   __libc_lock_unlock (lock);
 916
 917   if (status != NSS_STATUS_SUCCESS)
 918     return status;
 919
 920   status = internal_getgrgid_r (gid, grp, &ent, buffer, buflen, errnop);
 921
 922   internal_endgrent (&ent);
 923
 924   return status;
 925 }
 926
 927
 928 /* Support routines for remembering -@netgroup and -user entries.
 929    The names are stored in a single string with `|' as separator. */
 930 static void
 931 blacklist_store_name (const char *name, ent_t *ent)
 932 {
 933   int namelen = strlen (name);
 934   char *tmp;
 935
 936   /* first call, setup cache */
 937   if (ent->blacklist.size == 0)
 938     {
 939       ent->blacklist.size = MAX (BLACKLIST_INITIAL_SIZE, 2 * namelen);
 940       ent->blacklist.data = malloc (ent->blacklist.size);
 941       if (ent->blacklist.data == NULL)
 942         return;
 943       ent->blacklist.data[0] = '|';
 944       ent->blacklist.data[1] = '\0';
 945       ent->blacklist.current = 1;
 946     }
 947   else
 948     {
 949       if (in_blacklist (name, namelen, ent))
 950         return;                 /* no duplicates */
 951
 952       if (ent->blacklist.current + namelen + 1 >= ent->blacklist.size)
 953         {
 954           ent->blacklist.size += MAX (BLACKLIST_INCREMENT, 2 * namelen);
 955           tmp = realloc (ent->blacklist.data, ent->blacklist.size);
 956           if (tmp == NULL)
 957             {
 958               free (ent->blacklist.data);
 959               ent->blacklist.size = 0;
 960               return;
 961             }
 962           ent->blacklist.data = tmp;
 963         }
 964     }
 965
 966   tmp = stpcpy (ent->blacklist.data + ent->blacklist.current, name);
 967   *tmp++ = '|';
 968   *tmp = '\0';
 969   ent->blacklist.current += namelen + 1;
 970
 971   return;
 972 }
 973
 974 /* returns TRUE if ent->blacklist contains name, else FALSE */
 975 static bool_t
 976 in_blacklist (const char *name, int namelen, ent_t *ent)
 977 {
 978   char buf[namelen + 3];
 979   char *cp;
 980
 981   if (ent->blacklist.data == NULL)
 982     return FALSE;
 983
 984   buf[0] = '|';
 985   cp = stpcpy (&buf[1], name);
 986   *cp++= '|';
 987   *cp = '\0';
 988   return strstr (ent->blacklist.data, buf) != NULL;
 989 }