nis/nss_compat/compat-spwd.c

   1 /* Copyright (C) 1996-1999, 2001-2006, 2007 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Thorsten Kukuk <kukuk@vt.uni-paderborn.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 <ctype.h>
  21 #include <errno.h>
  22 #include <fcntl.h>
  23 #include <netdb.h>
  24 #include <nss.h>
  25 #include <nsswitch.h>
  26 #include <shadow.h>
  27 #include <stdio_ext.h>
  28 #include <string.h>
  29 #include <rpc/types.h>
  30 #include <rpcsvc/ypclnt.h>
  31 #include <bits/libc-lock.h>
  32 #include <kernel-features.h>
  33
  34 #include "netgroup.h"
  35
  36 static service_user *ni;
  37 static enum nss_status (*nss_setspent) (int stayopen);
  38 static enum nss_status (*nss_getspnam_r) (const char *name, struct spwd * sp,
  39                                           char *buffer, size_t buflen,
  40                                           int *errnop);
  41 static enum nss_status (*nss_getspent_r) (struct spwd * sp, char *buffer,
  42                                           size_t buflen, int *errnop);
  43 static enum nss_status (*nss_endspent) (void);
  44
  45 /* Get the declaration of the parser function.  */
  46 #define ENTNAME spent
  47 #define STRUCTURE spwd
  48 #define EXTERN_PARSER
  49 #include <nss/nss_files/files-parse.c>
  50
  51 /* Structure for remembering -@netgroup and -user members ... */
  52 #define BLACKLIST_INITIAL_SIZE 512
  53 #define BLACKLIST_INCREMENT 256
  54 struct blacklist_t
  55 {
  56   char *data;
  57   int current;
  58   int size;
  59 };
  60
  61 struct ent_t
  62 {
  63   bool netgroup;
  64   bool files;
  65   bool first;
  66   enum nss_status setent_status;
  67   FILE *stream;
  68   struct blacklist_t blacklist;
  69   struct spwd pwd;
  70   struct __netgrent netgrdata;
  71 };
  72 typedef struct ent_t ent_t;
  73
  74 static ent_t ext_ent = { false, true, false, NSS_STATUS_SUCCESS, NULL,
  75                          { NULL, 0, 0},
  76                          { NULL, NULL, 0, 0, 0, 0, 0, 0, 0}};
  77
  78 /* Protect global state against multiple changers.  */
  79 __libc_lock_define_initialized (static, lock)
  80
  81 /* Positive if O_CLOEXEC is supported, negative if it is not supported,
  82    zero if it is still undecided.  This variable is shared with the
  83    other compat functions.  */
  84 #ifdef __ASSUME_O_CLOEXEC
  85 # define __compat_have_cloexec 1
  86 #else
  87 # ifdef O_CLOEXEC
  88 extern int __compat_have_cloexec;
  89 # else
  90 #  define __compat_have_cloexec -1
  91 # endif
  92 #endif
  93
  94 /* Prototypes for local functions.  */
  95 static void blacklist_store_name (const char *, ent_t *);
  96 static int in_blacklist (const char *, int, ent_t *);
  97
  98 /* Initialize the NSS interface/functions. The calling function must
  99    hold the lock.  */
 100 static void
 101 init_nss_interface (void)
 102 {
 103   if (__nss_database_lookup ("shadow_compat", "passwd_compat",
 104                              "nis", &ni) >= 0)
 105     {
 106       nss_setspent = __nss_lookup_function (ni, "setspent");
 107       nss_getspnam_r = __nss_lookup_function (ni, "getspnam_r");
 108       nss_getspent_r = __nss_lookup_function (ni, "getspent_r");
 109       nss_endspent = __nss_lookup_function (ni, "endspent");
 110     }
 111 }
 112
 113 static void
 114 give_spwd_free (struct spwd *pwd)
 115 {
 116   free (pwd->sp_namp);
 117   free (pwd->sp_pwdp);
 118
 119   memset (pwd, '\0', sizeof (struct spwd));
 120   pwd->sp_warn = -1;
 121   pwd->sp_inact = -1;
 122   pwd->sp_expire = -1;
 123   pwd->sp_flag = ~0ul;
 124 }
 125
 126 static int
 127 spwd_need_buflen (struct spwd *pwd)
 128 {
 129   int len = 0;
 130
 131   if (pwd->sp_pwdp != NULL)
 132     len += strlen (pwd->sp_pwdp) + 1;
 133
 134   return len;
 135 }
 136
 137 static void
 138 copy_spwd_changes (struct spwd *dest, struct spwd *src,
 139                    char *buffer, size_t buflen)
 140 {
 141   if (src->sp_pwdp != NULL && strlen (src->sp_pwdp))
 142     {
 143       if (buffer == NULL)
 144         dest->sp_pwdp = strdup (src->sp_pwdp);
 145       else if (dest->sp_pwdp &&
 146                strlen (dest->sp_pwdp) >= strlen (src->sp_pwdp))
 147         strcpy (dest->sp_pwdp, src->sp_pwdp);
 148       else
 149         {
 150           dest->sp_pwdp = buffer;
 151           strcpy (dest->sp_pwdp, src->sp_pwdp);
 152           buffer += strlen (dest->sp_pwdp) + 1;
 153           buflen = buflen - (strlen (dest->sp_pwdp) + 1);
 154         }
 155     }
 156   if (src->sp_lstchg != 0)
 157     dest->sp_lstchg = src->sp_lstchg;
 158   if (src->sp_min != 0)
 159     dest->sp_min = src->sp_min;
 160   if (src->sp_max != 0)
 161     dest->sp_max = src->sp_max;
 162   if (src->sp_warn != -1)
 163     dest->sp_warn = src->sp_warn;
 164   if (src->sp_inact != -1)
 165     dest->sp_inact = src->sp_inact;
 166   if (src->sp_expire != -1)
 167     dest->sp_expire = src->sp_expire;
 168   if (src->sp_flag != ~0ul)
 169     dest->sp_flag = src->sp_flag;
 170 }
 171
 172 static enum nss_status
 173 internal_setspent (ent_t *ent, int stayopen)
 174 {
 175   enum nss_status status = NSS_STATUS_SUCCESS;
 176
 177   ent->first = ent->netgroup = 0;
 178   ent->files = true;
 179
 180   /* If something was left over free it.  */
 181   if (ent->netgroup)
 182     __internal_endnetgrent (&ent->netgrdata);
 183
 184   if (ent->blacklist.data != NULL)
 185     {
 186       ent->blacklist.current = 1;
 187       ent->blacklist.data[0] = '|';
 188       ent->blacklist.data[1] = '\0';
 189     }
 190   else
 191     ent->blacklist.current = 0;
 192
 193   if (ent->stream == NULL)
 194     {
 195       ent->stream = fopen ("/etc/shadow", "rme");
 196
 197       if (ent->stream == NULL)
 198         status = errno == EAGAIN ? NSS_STATUS_TRYAGAIN : NSS_STATUS_UNAVAIL;
 199       else
 200         {
 201           /* We have to make sure the file is  `closed on exec'.  */
 202           int result = 0;
 203
 204           if (__compat_have_cloexec <= 0)
 205             {
 206               int flags;
 207               result = flags = fcntl (fileno_unlocked (ent->stream), F_GETFD,
 208                                       0);
 209               if (result >= 0)
 210                 {
 211 #if defined O_CLOEXEC && !defined __ASSUME_O_CLOEXEC
 212                   if (__compat_have_cloexec == 0)
 213                     __compat_have_cloexec = (flags & FD_CLOEXEC) ? 1 : -1;
 214
 215                   if (__compat_have_cloexec < 0)
 216 #endif
 217                     {
 218                       flags |= FD_CLOEXEC;
 219                       result = fcntl (fileno_unlocked (ent->stream), F_SETFD,
 220                                       flags);
 221                     }
 222                 }
 223             }
 224
 225           if (result < 0)
 226             {
 227               /* Something went wrong.  Close the stream and return a
 228                  failure.  */
 229               fclose (ent->stream);
 230               ent->stream = NULL;
 231               status = NSS_STATUS_UNAVAIL;
 232             }
 233           else
 234             /* We take care of locking ourself.  */
 235             __fsetlocking (ent->stream, FSETLOCKING_BYCALLER);
 236         }
 237     }
 238   else
 239     rewind (ent->stream);
 240
 241   give_spwd_free (&ent->pwd);
 242
 243   if (status == NSS_STATUS_SUCCESS && nss_setspent)
 244     ent->setent_status = nss_setspent (stayopen);
 245
 246   return status;
 247 }
 248
 249
 250 enum nss_status
 251 _nss_compat_setspent (int stayopen)
 252 {
 253   enum nss_status result;
 254
 255   __libc_lock_lock (lock);
 256
 257   if (ni == NULL)
 258     init_nss_interface ();
 259
 260   result = internal_setspent (&ext_ent, stayopen);
 261
 262   __libc_lock_unlock (lock);
 263
 264   return result;
 265 }
 266
 267
 268 static enum nss_status
 269 internal_endspent (ent_t *ent)
 270 {
 271   if (nss_endspent)
 272     nss_endspent ();
 273
 274   if (ent->stream != NULL)
 275     {
 276       fclose (ent->stream);
 277       ent->stream = NULL;
 278     }
 279
 280   if (ent->netgroup)
 281     __internal_endnetgrent (&ent->netgrdata);
 282
 283   ent->first = ent->netgroup = false;
 284   ent->files = true;
 285
 286   if (ent->blacklist.data != NULL)
 287     {
 288       ent->blacklist.current = 1;
 289       ent->blacklist.data[0] = '|';
 290       ent->blacklist.data[1] = '\0';
 291     }
 292   else
 293     ent->blacklist.current = 0;
 294
 295   give_spwd_free (&ent->pwd);
 296
 297   return NSS_STATUS_SUCCESS;
 298 }
 299
 300 enum nss_status
 301 _nss_compat_endspent (void)
 302 {
 303   enum nss_status result;
 304
 305   __libc_lock_lock (lock);
 306
 307   result = internal_endspent (&ext_ent);
 308
 309   __libc_lock_unlock (lock);
 310
 311   return result;
 312 }
 313
 314
 315 static enum nss_status
 316 getspent_next_nss_netgr (const char *name, struct spwd *result, ent_t *ent,
 317                          char *group, char *buffer, size_t buflen,
 318                          int *errnop)
 319 {
 320   char *curdomain, *host, *user, *domain, *p2;
 321   size_t p2len;
 322
 323   if (!nss_getspnam_r)
 324     return NSS_STATUS_UNAVAIL;
 325
 326   /* If the setpwent call failed, say so.  */
 327   if (ent->setent_status != NSS_STATUS_SUCCESS)
 328     return ent->setent_status;
 329
 330   if (yp_get_default_domain (&curdomain) != YPERR_SUCCESS)
 331     {
 332       ent->netgroup = false;
 333       ent->first = false;
 334       give_spwd_free (&ent->pwd);
 335       return NSS_STATUS_UNAVAIL;
 336     }
 337
 338   if (ent->first == true)
 339     {
 340       memset (&ent->netgrdata, 0, sizeof (struct __netgrent));
 341       __internal_setnetgrent (group, &ent->netgrdata);
 342       ent->first = false;
 343     }
 344
 345   while (1)
 346     {
 347       char *saved_cursor;
 348       enum nss_status status;
 349
 350       saved_cursor = ent->netgrdata.cursor;
 351       status = __internal_getnetgrent_r (&host, &user, &domain,
 352                                          &ent->netgrdata, buffer, buflen,
 353                                          errnop);
 354       if (status != 1)
 355         {
 356           __internal_endnetgrent (&ent->netgrdata);
 357           ent->netgroup = false;
 358           give_spwd_free (&ent->pwd);
 359           return NSS_STATUS_RETURN;
 360         }
 361
 362       if (user == NULL || user[0] == '-')
 363         continue;
 364
 365       if (domain != NULL && strcmp (curdomain, domain) != 0)
 366         continue;
 367
 368       /* If name != NULL, we are called from getpwnam */
 369       if (name != NULL)
 370         if (strcmp (user, name) != 0)
 371           continue;
 372
 373       p2len = spwd_need_buflen (&ent->pwd);
 374       if (p2len > buflen)
 375         {
 376           *errnop = ERANGE;
 377           return NSS_STATUS_TRYAGAIN;
 378         }
 379       p2 = buffer + (buflen - p2len);
 380       buflen -= p2len;
 381
 382       if (nss_getspnam_r (user, result, buffer, buflen, errnop) !=
 383           NSS_STATUS_SUCCESS)
 384         continue;
 385
 386       if (!in_blacklist (result->sp_namp, strlen (result->sp_namp), ent))
 387         {
 388           /* Store the User in the blacklist for possible the "+" at the
 389              end of /etc/passwd */
 390           blacklist_store_name (result->sp_namp, ent);
 391           copy_spwd_changes (result, &ent->pwd, p2, p2len);
 392           break;
 393         }
 394     }
 395
 396   return NSS_STATUS_SUCCESS;
 397 }
 398
 399
 400 static enum nss_status
 401 getspent_next_nss (struct spwd *result, ent_t *ent,
 402                    char *buffer, size_t buflen, int *errnop)
 403 {
 404   enum nss_status status;
 405   char *p2;
 406   size_t p2len;
 407
 408   if (!nss_getspent_r)
 409     return NSS_STATUS_UNAVAIL;
 410
 411   p2len = spwd_need_buflen (&ent->pwd);
 412   if (p2len > buflen)
 413     {
 414       *errnop = ERANGE;
 415       return NSS_STATUS_TRYAGAIN;
 416     }
 417   p2 = buffer + (buflen - p2len);
 418   buflen -= p2len;
 419   do
 420     {
 421       if ((status = nss_getspent_r (result, buffer, buflen, errnop)) !=
 422           NSS_STATUS_SUCCESS)
 423         return status;
 424     }
 425   while (in_blacklist (result->sp_namp, strlen (result->sp_namp), ent));
 426
 427   copy_spwd_changes (result, &ent->pwd, p2, p2len);
 428
 429   return NSS_STATUS_SUCCESS;
 430 }
 431
 432
 433 /* This function handle the +user entrys in /etc/shadow */
 434 static enum nss_status
 435 getspnam_plususer (const char *name, struct spwd *result, ent_t *ent,
 436                    char *buffer, size_t buflen, int *errnop)
 437 {
 438   if (!nss_getspnam_r)
 439     return NSS_STATUS_UNAVAIL;
 440
 441   struct spwd pwd;
 442   memset (&pwd, '\0', sizeof (struct spwd));
 443   pwd.sp_warn = -1;
 444   pwd.sp_inact = -1;
 445   pwd.sp_expire = -1;
 446   pwd.sp_flag = ~0ul;
 447
 448   copy_spwd_changes (&pwd, result, NULL, 0);
 449
 450   size_t plen = spwd_need_buflen (&pwd);
 451   if (plen > buflen)
 452     {
 453       *errnop = ERANGE;
 454       return NSS_STATUS_TRYAGAIN;
 455     }
 456   char *p = buffer + (buflen - plen);
 457   buflen -= plen;
 458
 459   enum nss_status status = nss_getspnam_r (name, result, buffer, buflen,
 460                                            errnop);
 461   if (status != NSS_STATUS_SUCCESS)
 462     return status;
 463
 464   if (in_blacklist (result->sp_namp, strlen (result->sp_namp), ent))
 465     return NSS_STATUS_NOTFOUND;
 466
 467   copy_spwd_changes (result, &pwd, p, plen);
 468   give_spwd_free (&pwd);
 469   /* We found the entry.  */
 470   return NSS_STATUS_SUCCESS;
 471 }
 472
 473
 474 static enum nss_status
 475 getspent_next_file (struct spwd *result, ent_t *ent,
 476                     char *buffer, size_t buflen, int *errnop)
 477 {
 478   struct parser_data *data = (void *) buffer;
 479   while (1)
 480     {
 481       fpos_t pos;
 482       int parse_res = 0;
 483       char *p;
 484
 485       do
 486         {
 487           /* We need at least 3 characters for one line.  */
 488           if (__builtin_expect (buflen < 3, 0))
 489             {
 490             erange:
 491               *errnop = ERANGE;
 492               return NSS_STATUS_TRYAGAIN;
 493             }
 494
 495           fgetpos (ent->stream, &pos);
 496           buffer[buflen - 1] = '\xff';
 497           p = fgets_unlocked (buffer, buflen, ent->stream);
 498           if (p == NULL && feof_unlocked (ent->stream))
 499             return NSS_STATUS_NOTFOUND;
 500
 501           if (p == NULL || __builtin_expect (buffer[buflen - 1] != '\xff', 0))
 502             {
 503             erange_reset:
 504               fsetpos (ent->stream, &pos);
 505               goto erange;
 506             }
 507
 508           /* Skip leading blanks.  */
 509           while (isspace (*p))
 510             ++p;
 511         }
 512       while (*p == '\0' || *p == '#'    /* Ignore empty and comment lines.  */
 513              /* Parse the line.  If it is invalid, loop to
 514                 get the next line of the file to parse.  */
 515              || !(parse_res = _nss_files_parse_spent (p, result, data,
 516                                                       buflen, errnop)));
 517
 518       if (__builtin_expect (parse_res == -1, 0))
 519         /* The parser ran out of space.  */
 520         goto erange_reset;
 521
 522       if (result->sp_namp[0] != '+' && result->sp_namp[0] != '-')
 523         /* This is a real entry.  */
 524         break;
 525
 526       /* -@netgroup */
 527       if (result->sp_namp[0] == '-' && result->sp_namp[1] == '@'
 528           && result->sp_namp[2] != '\0')
 529         {
 530           /* XXX Do not use fixed length buffers.  */
 531           char buf2[1024];
 532           char *user, *host, *domain;
 533           struct __netgrent netgrdata;
 534
 535           bzero (&netgrdata, sizeof (struct __netgrent));
 536           __internal_setnetgrent (&result->sp_namp[2], &netgrdata);
 537           while (__internal_getnetgrent_r (&host, &user, &domain,
 538                                            &netgrdata, buf2, sizeof (buf2),
 539                                            errnop))
 540             {
 541               if (user != NULL && user[0] != '-')
 542                 blacklist_store_name (user, ent);
 543             }
 544           __internal_endnetgrent (&netgrdata);
 545           continue;
 546         }
 547
 548       /* +@netgroup */
 549       if (result->sp_namp[0] == '+' && result->sp_namp[1] == '@'
 550           && result->sp_namp[2] != '\0')
 551         {
 552           int status;
 553
 554           ent->netgroup = true;
 555           ent->first = true;
 556           copy_spwd_changes (&ent->pwd, result, NULL, 0);
 557
 558           status = getspent_next_nss_netgr (NULL, result, ent,
 559                                             &result->sp_namp[2],
 560                                             buffer, buflen, errnop);
 561           if (status == NSS_STATUS_RETURN)
 562             continue;
 563           else
 564             return status;
 565         }
 566
 567       /* -user */
 568       if (result->sp_namp[0] == '-' && result->sp_namp[1] != '\0'
 569           && result->sp_namp[1] != '@')
 570         {
 571           blacklist_store_name (&result->sp_namp[1], ent);
 572           continue;
 573         }
 574
 575       /* +user */
 576       if (result->sp_namp[0] == '+' && result->sp_namp[1] != '\0'
 577           && result->sp_namp[1] != '@')
 578         {
 579           size_t len = strlen (result->sp_namp);
 580           char buf[len];
 581           enum nss_status status;
 582
 583           /* Store the User in the blacklist for the "+" at the end of
 584              /etc/passwd */
 585           memcpy (buf, &result->sp_namp[1], len);
 586           status = getspnam_plususer (&result->sp_namp[1], result, ent,
 587                                       buffer, buflen, errnop);
 588           blacklist_store_name (buf, ent);
 589
 590           if (status == NSS_STATUS_SUCCESS)     /* We found the entry. */
 591             break;
 592           /* We couldn't parse the entry */
 593           else if (status == NSS_STATUS_RETURN
 594                    /* entry doesn't exist */
 595                    || status == NSS_STATUS_NOTFOUND)
 596             continue;
 597           else
 598             {
 599               if (status == NSS_STATUS_TRYAGAIN)
 600                 {
 601                   fsetpos (ent->stream, &pos);
 602                   *errnop = ERANGE;
 603                 }
 604               return status;
 605             }
 606         }
 607
 608       /* +:... */
 609       if (result->sp_namp[0] == '+' && result->sp_namp[1] == '\0')
 610         {
 611           ent->files = false;
 612           ent->first = true;
 613           copy_spwd_changes (&ent->pwd, result, NULL, 0);
 614
 615           return getspent_next_nss (result, ent, buffer, buflen, errnop);
 616         }
 617     }
 618
 619   return NSS_STATUS_SUCCESS;
 620 }
 621
 622
 623 static enum nss_status
 624 internal_getspent_r (struct spwd *pw, ent_t *ent,
 625                      char *buffer, size_t buflen, int *errnop)
 626 {
 627   if (ent->netgroup)
 628     {
 629       enum nss_status status;
 630
 631       /* We are searching members in a netgroup */
 632       /* Since this is not the first call, we don't need the group name */
 633       status = getspent_next_nss_netgr (NULL, pw, ent, NULL, buffer,
 634                                         buflen, errnop);
 635
 636       if (status == NSS_STATUS_RETURN)
 637         return getspent_next_file (pw, ent, buffer, buflen, errnop);
 638       else
 639         return status;
 640     }
 641   else if (ent->files)
 642     return getspent_next_file (pw, ent, buffer, buflen, errnop);
 643   else
 644     return getspent_next_nss (pw, ent, buffer, buflen, errnop);
 645 }
 646
 647
 648 enum nss_status
 649 _nss_compat_getspent_r (struct spwd *pwd, char *buffer, size_t buflen,
 650                         int *errnop)
 651 {
 652   enum nss_status result = NSS_STATUS_SUCCESS;
 653
 654   __libc_lock_lock (lock);
 655
 656   /* Be prepared that the setpwent function was not called before.  */
 657   if (ni == NULL)
 658     init_nss_interface ();
 659
 660   if (ext_ent.stream == NULL)
 661     result = internal_setspent (&ext_ent, 1);
 662
 663   if (result == NSS_STATUS_SUCCESS)
 664     result = internal_getspent_r (pwd, &ext_ent, buffer, buflen, errnop);
 665
 666   __libc_lock_unlock (lock);
 667
 668   return result;
 669 }
 670
 671
 672 /* Searches in /etc/passwd and the NIS/NIS+ map for a special user */
 673 static enum nss_status
 674 internal_getspnam_r (const char *name, struct spwd *result, ent_t *ent,
 675                      char *buffer, size_t buflen, int *errnop)
 676 {
 677   struct parser_data *data = (void *) buffer;
 678
 679   while (1)
 680     {
 681       fpos_t pos;
 682       char *p;
 683       int parse_res;
 684
 685       do
 686         {
 687           /* We need at least 3 characters for one line.  */
 688           if (__builtin_expect (buflen < 3, 0))
 689             {
 690             erange:
 691               *errnop = ERANGE;
 692               return NSS_STATUS_TRYAGAIN;
 693             }
 694
 695           fgetpos (ent->stream, &pos);
 696           buffer[buflen - 1] = '\xff';
 697           p = fgets_unlocked (buffer, buflen, ent->stream);
 698           if (p == NULL && feof_unlocked (ent->stream))
 699             return NSS_STATUS_NOTFOUND;
 700
 701           if (p == NULL || buffer[buflen - 1] != '\xff')
 702             {
 703             erange_reset:
 704               fsetpos (ent->stream, &pos);
 705               goto erange;
 706             }
 707
 708           /* Terminate the line for any case.  */
 709           buffer[buflen - 1] = '\0';
 710
 711           /* Skip leading blanks.  */
 712           while (isspace (*p))
 713             ++p;
 714         }
 715       while (*p == '\0' || *p == '#' || /* Ignore empty and comment lines.  */
 716              /* Parse the line.  If it is invalid, loop to
 717                 get the next line of the file to parse.  */
 718              !(parse_res = _nss_files_parse_spent (p, result, data, buflen,
 719                                                    errnop)));
 720
 721       if (__builtin_expect (parse_res == -1, 0))
 722         /* The parser ran out of space.  */
 723         goto erange_reset;
 724
 725       /* This is a real entry.  */
 726       if (result->sp_namp[0] != '+' && result->sp_namp[0] != '-')
 727         {
 728           if (strcmp (result->sp_namp, name) == 0)
 729             return NSS_STATUS_SUCCESS;
 730           else
 731             continue;
 732         }
 733
 734       /* -@netgroup */
 735       /* If the loaded NSS module does not support this service, add
 736          all users from a +@netgroup entry to the blacklist, too.  */
 737       if (result->sp_namp[0] == '-' && result->sp_namp[1] == '@'
 738           && result->sp_namp[2] != '\0')
 739         {
 740           if (innetgr (&result->sp_namp[2], NULL, name, NULL))
 741             return NSS_STATUS_NOTFOUND;
 742           continue;
 743         }
 744
 745       /* +@netgroup */
 746       if (result->sp_namp[0] == '+' && result->sp_namp[1] == '@'
 747           && result->sp_namp[2] != '\0')
 748         {
 749           enum nss_status status;
 750
 751           if (innetgr (&result->sp_namp[2], NULL, name, NULL))
 752             {
 753               status = getspnam_plususer (name, result, ent, buffer,
 754                                           buflen, errnop);
 755
 756               if (status == NSS_STATUS_RETURN)
 757                 continue;
 758
 759               return status;
 760             }
 761           continue;
 762         }
 763
 764       /* -user */
 765       if (result->sp_namp[0] == '-' && result->sp_namp[1] != '\0'
 766           && result->sp_namp[1] != '@')
 767         {
 768           if (strcmp (&result->sp_namp[1], name) == 0)
 769             return NSS_STATUS_NOTFOUND;
 770           else
 771             continue;
 772         }
 773
 774       /* +user */
 775       if (result->sp_namp[0] == '+' && result->sp_namp[1] != '\0'
 776           && result->sp_namp[1] != '@')
 777         {
 778           if (strcmp (name, &result->sp_namp[1]) == 0)
 779             {
 780               enum nss_status status;
 781
 782               status = getspnam_plususer (name, result, ent,
 783                                           buffer, buflen, errnop);
 784
 785               if (status == NSS_STATUS_RETURN)
 786                 /* We couldn't parse the entry */
 787                 return NSS_STATUS_NOTFOUND;
 788               else
 789                 return status;
 790             }
 791         }
 792
 793       /* +:... */
 794       if (result->sp_namp[0] == '+' && result->sp_namp[1] == '\0')
 795         {
 796           enum nss_status status;
 797
 798           status = getspnam_plususer (name, result, ent,
 799                                       buffer, buflen, errnop);
 800
 801           if (status == NSS_STATUS_SUCCESS)
 802             /* We found the entry. */
 803             break;
 804           else if (status == NSS_STATUS_RETURN)
 805             /* We couldn't parse the entry */
 806             return NSS_STATUS_NOTFOUND;
 807           else
 808             return status;
 809         }
 810     }
 811   return NSS_STATUS_SUCCESS;
 812 }
 813
 814
 815 enum nss_status
 816 _nss_compat_getspnam_r (const char *name, struct spwd *pwd,
 817                         char *buffer, size_t buflen, int *errnop)
 818 {
 819   enum nss_status result;
 820   ent_t ent = { false, true, false, NSS_STATUS_SUCCESS, NULL, { NULL, 0, 0},
 821                 { NULL, NULL, 0, 0, 0, 0, 0, 0, 0}};
 822
 823   if (name[0] == '-' || name[0] == '+')
 824     return NSS_STATUS_NOTFOUND;
 825
 826   __libc_lock_lock (lock);
 827
 828   if (ni == NULL)
 829     init_nss_interface ();
 830
 831   __libc_lock_unlock (lock);
 832
 833   result = internal_setspent (&ent, 0);
 834
 835   if (result == NSS_STATUS_SUCCESS)
 836     result = internal_getspnam_r (name, pwd, &ent, buffer, buflen, errnop);
 837
 838   internal_endspent (&ent);
 839
 840   return result;
 841 }
 842
 843
 844 /* Support routines for remembering -@netgroup and -user entries.
 845    The names are stored in a single string with `|' as separator. */
 846 static void
 847 blacklist_store_name (const char *name, ent_t *ent)
 848 {
 849   int namelen = strlen (name);
 850   char *tmp;
 851
 852   /* first call, setup cache */
 853   if (ent->blacklist.size == 0)
 854     {
 855       ent->blacklist.size = MAX (BLACKLIST_INITIAL_SIZE, 2 * namelen);
 856       ent->blacklist.data = malloc (ent->blacklist.size);
 857       if (ent->blacklist.data == NULL)
 858         return;
 859       ent->blacklist.data[0] = '|';
 860       ent->blacklist.data[1] = '\0';
 861       ent->blacklist.current = 1;
 862     }
 863   else
 864     {
 865       if (in_blacklist (name, namelen, ent))
 866         return;                 /* no duplicates */
 867
 868       if (ent->blacklist.current + namelen + 1 >= ent->blacklist.size)
 869         {
 870           ent->blacklist.size += MAX (BLACKLIST_INCREMENT, 2 * namelen);
 871           tmp = realloc (ent->blacklist.data, ent->blacklist.size);
 872           if (tmp == NULL)
 873             {
 874               free (ent->blacklist.data);
 875               ent->blacklist.size = 0;
 876               return;
 877             }
 878           ent->blacklist.data = tmp;
 879         }
 880     }
 881
 882   tmp = stpcpy (ent->blacklist.data + ent->blacklist.current, name);
 883   *tmp++ = '|';
 884   *tmp = '\0';
 885   ent->blacklist.current += namelen + 1;
 886
 887   return;
 888 }
 889
 890
 891 /* Returns TRUE if ent->blacklist contains name, else FALSE.  */
 892 static bool_t
 893 in_blacklist (const char *name, int namelen, ent_t *ent)
 894 {
 895   char buf[namelen + 3];
 896   char *cp;
 897
 898   if (ent->blacklist.data == NULL)
 899     return false;
 900
 901   buf[0] = '|';
 902   cp = stpcpy (&buf[1], name);
 903   *cp++ = '|';
 904   *cp = '\0';
 905   return strstr (ent->blacklist.data, buf) != NULL;
 906 }