nss/nsswitch.c

   1 /* Copyright (C) 1996, 1997, 1998, 1999, 2001, 2002, 2003, 2004, 2005, 2006
   2    Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, write to the Free
  18    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19    02111-1307 USA.  */
  20
  21 #include <ctype.h>
  22 #include <dlfcn.h>
  23 #include <errno.h>
  24 #include <netdb.h>
  25 #include <bits/libc-lock.h>
  26 #include <search.h>
  27 #include <stdio.h>
  28 #include <stdio_ext.h>
  29 #include <stdlib.h>
  30 #include <string.h>
  31
  32 #include <aliases.h>
  33 #include <grp.h>
  34 #include <netinet/ether.h>
  35 #include <pwd.h>
  36 #include <shadow.h>
  37
  38 #if !defined DO_STATIC_NSS || defined SHARED
  39 # include <gnu/lib-names.h>
  40 #endif
  41
  42 #include "nsswitch.h"
  43 #include "../nscd/nscd_proto.h"
  44
  45 /* Prototypes for the local functions.  */
  46 static name_database *nss_parse_file (const char *fname) internal_function;
  47 static name_database_entry *nss_getline (char *line) internal_function;
  48 static service_user *nss_parse_service_list (const char *line)
  49      internal_function;
  50 static service_library *nss_new_service (name_database *database,
  51                                          const char *name) internal_function;
  52
  53
  54 /* Declare external database variables.  */
  55 #define DEFINE_DATABASE(name)                                                 \
  56   extern service_user *__nss_##name##_database attribute_hidden;              \
  57   weak_extern (__nss_##name##_database)
  58 #include "databases.def"
  59 #undef DEFINE_DATABASE
  60
  61 /* Structure to map database name to variable.  */
  62 static const struct
  63 {
  64   const char name[10];
  65   service_user **dbp;
  66 } databases[] =
  67 {
  68 #define DEFINE_DATABASE(name)                                                 \
  69   { #name, &__nss_##name##_database },
  70 #include "databases.def"
  71 #undef DEFINE_DATABASE
  72 };
  73 #define ndatabases (sizeof (databases) / sizeof (databases[0]))
  74
  75
  76 __libc_lock_define_initialized (static, lock)
  77
  78 #if !defined DO_STATIC_NSS || defined SHARED
  79 /* String with revision number of the shared object files.  */
  80 static const char *const __nss_shlib_revision = LIBNSS_FILES_SO + 15;
  81 #endif
  82
  83 /* The root of the whole data base.  */
  84 static name_database *service_table;
  85
  86
  87 /* -1 == database not found
  88     0 == database entry pointer stored */
  89 int
  90 __nss_database_lookup (const char *database, const char *alternate_name,
  91                        const char *defconfig, service_user **ni)
  92 {
  93   /* Prevent multiple threads to change the service table.  */
  94   __libc_lock_lock (lock);
  95
  96   /* Reconsider database variable in case some other thread called
  97      `__nss_configure_lookup' while we waited for the lock.  */
  98   if (*ni != NULL)
  99     {
 100       __libc_lock_unlock (lock);
 101       return 0;
 102     }
 103
 104   /* Are we initialized yet?  */
 105   if (service_table == NULL)
 106     /* Read config file.  */
 107     service_table = nss_parse_file (_PATH_NSSWITCH_CONF);
 108
 109   /* Test whether configuration data is available.  */
 110   if (service_table != NULL)
 111     {
 112       /* Return first `service_user' entry for DATABASE.  */
 113       name_database_entry *entry;
 114
 115       /* XXX Could use some faster mechanism here.  But each database is
 116          only requested once and so this might not be critical.  */
 117       for (entry = service_table->entry; entry != NULL; entry = entry->next)
 118         if (strcmp (database, entry->name) == 0)
 119           *ni = entry->service;
 120
 121       if (*ni == NULL && alternate_name != NULL)
 122         /* We haven't found an entry so far.  Try to find it with the
 123            alternative name.  */
 124         for (entry = service_table->entry; entry != NULL; entry = entry->next)
 125           if (strcmp (alternate_name, entry->name) == 0)
 126             *ni = entry->service;
 127     }
 128
 129   /* No configuration data is available, either because nsswitch.conf
 130      doesn't exist or because it doesn't has a line for this database.
 131
 132      DEFCONFIG specifies the default service list for this database,
 133      or null to use the most common default.  */
 134   if (*ni == NULL)
 135     *ni = nss_parse_service_list (defconfig
 136                                   ?: "nis [NOTFOUND=return] files");
 137
 138   __libc_lock_unlock (lock);
 139
 140   return 0;
 141 }
 142 libc_hidden_def (__nss_database_lookup)
 143
 144
 145 /* -1 == not found
 146     0 == function found
 147     1 == finished */
 148 int
 149 __nss_lookup (service_user **ni, const char *fct_name, void **fctp)
 150 {
 151   *fctp = __nss_lookup_function (*ni, fct_name);
 152
 153   while (*fctp == NULL
 154          && nss_next_action (*ni, NSS_STATUS_UNAVAIL) == NSS_ACTION_CONTINUE
 155          && (*ni)->next != NULL)
 156     {
 157       *ni = (*ni)->next;
 158
 159       *fctp = __nss_lookup_function (*ni, fct_name);
 160     }
 161
 162   return *fctp != NULL ? 0 : (*ni)->next == NULL ? 1 : -1;
 163 }
 164
 165
 166 /* -1 == not found
 167     0 == adjusted for next function
 168     1 == finished */
 169 int
 170 __nss_next (service_user **ni, const char *fct_name, void **fctp, int status,
 171             int all_values)
 172 {
 173   if (all_values)
 174     {
 175       if (nss_next_action (*ni, NSS_STATUS_TRYAGAIN) == NSS_ACTION_RETURN
 176           && nss_next_action (*ni, NSS_STATUS_UNAVAIL) == NSS_ACTION_RETURN
 177           && nss_next_action (*ni, NSS_STATUS_NOTFOUND) == NSS_ACTION_RETURN
 178           && nss_next_action (*ni, NSS_STATUS_SUCCESS) == NSS_ACTION_RETURN)
 179         return 1;
 180     }
 181   else
 182     {
 183       /* This is really only for debugging.  */
 184        if (NSS_STATUS_TRYAGAIN > status || status > NSS_STATUS_RETURN)
 185          __libc_fatal ("illegal status in __nss_next");
 186
 187        if (nss_next_action (*ni, status) == NSS_ACTION_RETURN)
 188          return 1;
 189     }
 190
 191   if ((*ni)->next == NULL)
 192     return -1;
 193
 194   do
 195     {
 196       *ni = (*ni)->next;
 197
 198       *fctp = __nss_lookup_function (*ni, fct_name);
 199     }
 200   while (*fctp == NULL
 201          && nss_next_action (*ni, NSS_STATUS_UNAVAIL) == NSS_ACTION_CONTINUE
 202          && (*ni)->next != NULL);
 203
 204   return *fctp != NULL ? 0 : -1;
 205 }
 206 libc_hidden_def (__nss_next)
 207
 208
 209 int
 210 __nss_configure_lookup (const char *dbname, const char *service_line)
 211 {
 212   service_user *new_db;
 213   size_t cnt;
 214
 215   for (cnt = 0; cnt < ndatabases; ++cnt)
 216     {
 217       int cmp = strcmp (dbname, databases[cnt].name);
 218       if (cmp == 0)
 219         break;
 220       if (cmp < 0)
 221         {
 222           __set_errno (EINVAL);
 223           return -1;
 224         }
 225     }
 226
 227   if (cnt == ndatabases)
 228     {
 229       __set_errno (EINVAL);
 230       return -1;
 231     }
 232
 233   /* Test whether it is really used.  */
 234   if (databases[cnt].dbp == NULL)
 235     /* Nothing to do, but we could do.  */
 236     return 0;
 237
 238   /* Try to generate new data.  */
 239   new_db = nss_parse_service_list (service_line);
 240   if (new_db == NULL)
 241     {
 242       /* Illegal service specification.  */
 243       __set_errno (EINVAL);
 244       return -1;
 245     }
 246
 247   /* Prevent multiple threads to change the service table.  */
 248   __libc_lock_lock (lock);
 249
 250   /* Install new rules.  */
 251   *databases[cnt].dbp = new_db;
 252
 253   __libc_lock_unlock (lock);
 254
 255   return 0;
 256 }
 257
 258
 259 /* Comparison function for searching NI->known tree.  */
 260 static int
 261 known_compare (const void *p1, const void *p2)
 262 {
 263   return p1 == p2 ? 0 : strcmp (*(const char *const *) p1,
 264                                 *(const char *const *) p2);
 265 }
 266
 267
 268 void *
 269 __nss_lookup_function (service_user *ni, const char *fct_name)
 270 {
 271   void **found, *result;
 272
 273   /* We now modify global data.  Protect it.  */
 274   __libc_lock_lock (lock);
 275
 276   /* Search the tree of functions previously requested.  Data in the
 277      tree are `known_function' structures, whose first member is a
 278      `const char *', the lookup key.  The search returns a pointer to
 279      the tree node structure; the first member of the is a pointer to
 280      our structure (i.e. what will be a `known_function'); since the
 281      first member of that is the lookup key string, &FCT_NAME is close
 282      enough to a pointer to our structure to use as a lookup key that
 283      will be passed to `known_compare' (above).  */
 284
 285   found = __tsearch (&fct_name, (void **) &ni->known, &known_compare);
 286   if (*found != &fct_name)
 287     /* The search found an existing structure in the tree.  */
 288     result = ((known_function *) *found)->fct_ptr;
 289   else
 290     {
 291       /* This name was not known before.  Now we have a node in the tree
 292          (in the proper sorted position for FCT_NAME) that points to
 293          &FCT_NAME instead of any real `known_function' structure.
 294          Allocate a new structure and fill it in.  */
 295
 296       known_function *known = malloc (sizeof *known);
 297       if (! known)
 298         {
 299         remove_from_tree:
 300           /* Oops.  We can't instantiate this node properly.
 301              Remove it from the tree.  */
 302           __tdelete (&fct_name, (void **) &ni->known, &known_compare);
 303           result = NULL;
 304         }
 305       else
 306         {
 307           /* Point the tree node at this new structure.  */
 308           *found = known;
 309           known->fct_name = fct_name;
 310
 311           if (ni->library == NULL)
 312             {
 313               /* This service has not yet been used.  Fetch the service
 314                  library for it, creating a new one if need be.  If there
 315                  is no service table from the file, this static variable
 316                  holds the head of the service_library list made from the
 317                  default configuration.  */
 318               static name_database default_table;
 319               ni->library = nss_new_service (service_table ?: &default_table,
 320                                              ni->name);
 321               if (ni->library == NULL)
 322                 {
 323                   /* This only happens when out of memory.  */
 324                   free (known);
 325                   goto remove_from_tree;
 326                 }
 327             }
 328
 329 #if !defined DO_STATIC_NSS || defined SHARED
 330           if (ni->library->lib_handle == NULL)
 331             {
 332               /* Load the shared library.  */
 333               size_t shlen = (7 + strlen (ni->library->name) + 3
 334                               + strlen (__nss_shlib_revision) + 1);
 335               int saved_errno = errno;
 336               char shlib_name[shlen];
 337
 338               /* Construct shared object name.  */
 339               __stpcpy (__stpcpy (__stpcpy (__stpcpy (shlib_name,
 340                                                       "libnss_"),
 341                                             ni->library->name),
 342                                   ".so"),
 343                         __nss_shlib_revision);
 344
 345               ni->library->lib_handle = __libc_dlopen (shlib_name);
 346               if (ni->library->lib_handle == NULL)
 347                 {
 348                   /* Failed to load the library.  */
 349                   ni->library->lib_handle = (void *) -1l;
 350                   __set_errno (saved_errno);
 351                 }
 352             }
 353
 354           if (ni->library->lib_handle == (void *) -1l)
 355             /* Library not found => function not found.  */
 356             result = NULL;
 357           else
 358             {
 359               /* Get the desired function.  */
 360               size_t namlen = (5 + strlen (ni->library->name) + 1
 361                                + strlen (fct_name) + 1);
 362               char name[namlen];
 363
 364               /* Construct the function name.  */
 365               __stpcpy (__stpcpy (__stpcpy (__stpcpy (name, "_nss_"),
 366                                             ni->library->name),
 367                                   "_"),
 368                         fct_name);
 369
 370               /* Look up the symbol.  */
 371               result = __libc_dlsym (ni->library->lib_handle, name);
 372             }
 373 #else
 374           /* We can't get function address dynamically in static linking. */
 375           {
 376 # define DEFINE_ENT(h,nm)                                                     \
 377             { #h"_get"#nm"ent_r", _nss_##h##_get##nm##ent_r },                \
 378             { #h"_end"#nm"ent", _nss_##h##_end##nm##ent },                    \
 379             { #h"_set"#nm"ent", _nss_##h##_set##nm##ent },
 380 # define DEFINE_GET(h,nm)                                                     \
 381             { #h"_get"#nm"_r", _nss_##h##_get##nm##_r },
 382 # define DEFINE_GETBY(h,nm,ky)                                                \
 383             { #h"_get"#nm"by"#ky"_r", _nss_##h##_get##nm##by##ky##_r },
 384             static struct fct_tbl { const char *fname; void *fp; } *tp, tbl[] =
 385               {
 386 # include "function.def"
 387                 { NULL, NULL }
 388               };
 389             size_t namlen = (5 + strlen (ni->library->name) + 1
 390                              + strlen (fct_name) + 1);
 391             char name[namlen];
 392
 393             /* Construct the function name.  */
 394             __stpcpy (__stpcpy (__stpcpy (name, ni->library->name),
 395                                 "_"),
 396                       fct_name);
 397
 398             result = NULL;
 399             for (tp = &tbl[0]; tp->fname; tp++)
 400               if (strcmp (tp->fname, name) == 0)
 401                 {
 402                   result = tp->fp;
 403                   break;
 404                 }
 405           }
 406 #endif
 407
 408           /* Remember function pointer for later calls.  Even if null, we
 409              record it so a second try needn't search the library again.  */
 410           known->fct_ptr = result;
 411         }
 412     }
 413
 414   /* Remove the lock.  */
 415   __libc_lock_unlock (lock);
 416
 417   return result;
 418 }
 419 libc_hidden_def (__nss_lookup_function)
 420
 421
 422 static name_database *
 423 internal_function
 424 nss_parse_file (const char *fname)
 425 {
 426   FILE *fp;
 427   name_database *result;
 428   name_database_entry *last;
 429   char *line;
 430   size_t len;
 431
 432   /* Open the configuration file.  */
 433   fp = fopen (fname, "rc");
 434   if (fp == NULL)
 435     return NULL;
 436
 437   /* No threads use this stream.  */
 438   __fsetlocking (fp, FSETLOCKING_BYCALLER);
 439
 440   result = (name_database *) malloc (sizeof (name_database));
 441   if (result == NULL)
 442     return NULL;
 443
 444   result->entry = NULL;
 445   result->library = NULL;
 446   last = NULL;
 447   line = NULL;
 448   len = 0;
 449   do
 450     {
 451       name_database_entry *this;
 452       ssize_t n;
 453
 454       n = __getline (&line, &len, fp);
 455       if (n < 0)
 456         break;
 457       if (line[n - 1] == '\n')
 458         line[n - 1] = '\0';
 459
 460       /* Because the file format does not know any form of quoting we
 461          can search forward for the next '#' character and if found
 462          make it terminating the line.  */
 463       *__strchrnul (line, '#') = '\0';
 464
 465       /* If the line is blank it is ignored.  */
 466       if (line[0] == '\0')
 467         continue;
 468
 469       /* Each line completely specifies the actions for a database.  */
 470       this = nss_getline (line);
 471       if (this != NULL)
 472         {
 473           if (last != NULL)
 474             last->next = this;
 475           else
 476             result->entry = this;
 477
 478           last = this;
 479         }
 480     }
 481   while (!feof_unlocked (fp));
 482
 483   /* Free the buffer.  */
 484   free (line);
 485   /* Close configuration file.  */
 486   fclose (fp);
 487
 488   return result;
 489 }
 490
 491
 492 /* Read the source names:
 493         `( <source> ( "[" "!"? (<status> "=" <action> )+ "]" )? )*'
 494    */
 495 static service_user *
 496 internal_function
 497 nss_parse_service_list (const char *line)
 498 {
 499   service_user *result = NULL, **nextp = &result;
 500
 501   while (1)
 502     {
 503       service_user *new_service;
 504       const char *name;
 505
 506       while (isspace (line[0]))
 507         ++line;
 508       if (line[0] == '\0')
 509         /* No source specified.  */
 510         return result;
 511
 512       /* Read <source> identifier.  */
 513       name = line;
 514       while (line[0] != '\0' && !isspace (line[0]) && line[0] != '[')
 515         ++line;
 516       if (name == line)
 517         return result;
 518
 519
 520       new_service = (service_user *) malloc (sizeof (service_user)
 521                                              + (line - name + 1));
 522       if (new_service == NULL)
 523         return result;
 524
 525       *((char *) __mempcpy (new_service->name, name, line - name)) = '\0';
 526
 527       /* Set default actions.  */
 528       new_service->actions[2 + NSS_STATUS_TRYAGAIN] = NSS_ACTION_CONTINUE;
 529       new_service->actions[2 + NSS_STATUS_UNAVAIL] = NSS_ACTION_CONTINUE;
 530       new_service->actions[2 + NSS_STATUS_NOTFOUND] = NSS_ACTION_CONTINUE;
 531       new_service->actions[2 + NSS_STATUS_SUCCESS] = NSS_ACTION_RETURN;
 532       new_service->actions[2 + NSS_STATUS_RETURN] = NSS_ACTION_RETURN;
 533       new_service->library = NULL;
 534       new_service->known = NULL;
 535       new_service->next = NULL;
 536
 537       while (isspace (line[0]))
 538         ++line;
 539
 540       if (line[0] == '[')
 541         {
 542           /* Read criterions.  */
 543           do
 544             ++line;
 545           while (line[0] != '\0' && isspace (line[0]));
 546
 547           do
 548             {
 549               int not;
 550               enum nss_status status;
 551               lookup_actions action;
 552
 553               /* Grok ! before name to mean all statii but that one.  */
 554               not = line[0] == '!';
 555               if (not)
 556                 ++line;
 557
 558               /* Read status name.  */
 559               name = line;
 560               while (line[0] != '\0' && !isspace (line[0]) && line[0] != '='
 561                      && line[0] != ']')
 562                 ++line;
 563
 564               /* Compare with known statii.  */
 565               if (line - name == 7)
 566                 {
 567                   if (__strncasecmp (name, "SUCCESS", 7) == 0)
 568                     status = NSS_STATUS_SUCCESS;
 569                   else if (__strncasecmp (name, "UNAVAIL", 7) == 0)
 570                     status = NSS_STATUS_UNAVAIL;
 571                   else
 572                     return result;
 573                 }
 574               else if (line - name == 8)
 575                 {
 576                   if (__strncasecmp (name, "NOTFOUND", 8) == 0)
 577                     status = NSS_STATUS_NOTFOUND;
 578                   else if (__strncasecmp (name, "TRYAGAIN", 8) == 0)
 579                     status = NSS_STATUS_TRYAGAIN;
 580                   else
 581                     return result;
 582                 }
 583               else
 584                 return result;
 585
 586               while (isspace (line[0]))
 587                 ++line;
 588               if (line[0] != '=')
 589                 return result;
 590               do
 591                 ++line;
 592               while (isspace (line[0]));
 593
 594               name = line;
 595               while (line[0] != '\0' && !isspace (line[0]) && line[0] != '='
 596                      && line[0] != ']')
 597                 ++line;
 598
 599               if (line - name == 6 && __strncasecmp (name, "RETURN", 6) == 0)
 600                 action = NSS_ACTION_RETURN;
 601               else if (line - name == 8
 602                        && __strncasecmp (name, "CONTINUE", 8) == 0)
 603                 action = NSS_ACTION_CONTINUE;
 604               else
 605                 return result;
 606
 607               if (not)
 608                 {
 609                   /* Save the current action setting for this status,
 610                      set them all to the given action, and reset this one.  */
 611                   const lookup_actions save = new_service->actions[2 + status];
 612                   new_service->actions[2 + NSS_STATUS_TRYAGAIN] = action;
 613                   new_service->actions[2 + NSS_STATUS_UNAVAIL] = action;
 614                   new_service->actions[2 + NSS_STATUS_NOTFOUND] = action;
 615                   new_service->actions[2 + NSS_STATUS_SUCCESS] = action;
 616                   new_service->actions[2 + status] = save;
 617                 }
 618               else
 619                 new_service->actions[2 + status] = action;
 620
 621               /* Skip white spaces.  */
 622               while (isspace (line[0]))
 623                 ++line;
 624             }
 625           while (line[0] != ']');
 626
 627           /* Skip the ']'.  */
 628           ++line;
 629         }
 630
 631       *nextp = new_service;
 632       nextp = &new_service->next;
 633     }
 634 }
 635
 636 static name_database_entry *
 637 internal_function
 638 nss_getline (char *line)
 639 {
 640   const char *name;
 641   name_database_entry *result;
 642   size_t len;
 643
 644   /* Ignore leading white spaces.  ATTENTION: this is different from
 645      what is implemented in Solaris.  The Solaris man page says a line
 646      beginning with a white space character is ignored.  We regard
 647      this as just another misfeature in Solaris.  */
 648   while (isspace (line[0]))
 649     ++line;
 650
 651   /* Recognize `<database> ":"'.  */
 652   name = line;
 653   while (line[0] != '\0' && !isspace (line[0]) && line[0] != ':')
 654     ++line;
 655   if (line[0] == '\0' || name == line)
 656     /* Syntax error.  */
 657     return NULL;
 658   *line++ = '\0';
 659
 660   len = strlen (name) + 1;
 661
 662   result = (name_database_entry *) malloc (sizeof (name_database_entry) + len);
 663   if (result == NULL)
 664     return NULL;
 665
 666   /* Save the database name.  */
 667   memcpy (result->name, name, len);
 668
 669   /* Parse the list of services.  */
 670   result->service = nss_parse_service_list (line);
 671
 672   result->next = NULL;
 673   return result;
 674 }
 675
 676
 677 static service_library *
 678 internal_function
 679 nss_new_service (name_database *database, const char *name)
 680 {
 681   service_library **currentp = &database->library;
 682
 683   while (*currentp != NULL)
 684     {
 685       if (strcmp ((*currentp)->name, name) == 0)
 686         return *currentp;
 687       currentp = &(*currentp)->next;
 688     }
 689
 690   /* We have to add the new service.  */
 691   *currentp = (service_library *) malloc (sizeof (service_library));
 692   if (*currentp == NULL)
 693     return NULL;
 694
 695   (*currentp)->name = name;
 696   (*currentp)->lib_handle = NULL;
 697   (*currentp)->next = NULL;
 698
 699   return *currentp;
 700 }
 701
 702
 703 /* Called by nscd and nscd alone.  */
 704 void
 705 __nss_disable_nscd (void)
 706 {
 707   /* Disable all uses of NSCD.  */
 708   __nss_not_use_nscd_passwd = -1;
 709   __nss_not_use_nscd_group = -1;
 710   __nss_not_use_nscd_hosts = -1;
 711 }
 712
 713
 714 /* Free all resources if necessary.  */
 715 libc_freeres_fn (free_mem)
 716 {
 717   name_database *top = service_table;
 718   name_database_entry *entry;
 719   service_library *library;
 720
 721   if (top == NULL)
 722     /* Maybe we have not read the nsswitch.conf file.  */
 723     return;
 724
 725   /* Don't disturb ongoing other threads (if there are any).  */
 726   service_table = NULL;
 727
 728   entry = top->entry;
 729   while (entry != NULL)
 730     {
 731       name_database_entry *olde = entry;
 732       service_user *service = entry->service;
 733
 734       while (service != NULL)
 735         {
 736           service_user *olds = service;
 737
 738           if (service->known != NULL)
 739             __tdestroy (service->known, free);
 740
 741           service = service->next;
 742           free (olds);
 743         }
 744
 745       entry = entry->next;
 746       free (olde);
 747     }
 748
 749   library = top->library;
 750   while (library != NULL)
 751     {
 752       service_library *oldl = library;
 753
 754       if (library->lib_handle && library->lib_handle != (void *) -1l)
 755         __libc_dlclose (library->lib_handle);
 756
 757       library = library->next;
 758       free (oldl);
 759     }
 760
 761   free (top);
 762 }