nss/nsswitch.c

   1 /* Copyright (C) 1996-2017 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Ulrich Drepper <drepper@cygnus.com>, 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, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <ctype.h>
  20 #include <dlfcn.h>
  21 #include <errno.h>
  22 #include <netdb.h>
  23 #include <libc-lock.h>
  24 #include <search.h>
  25 #include <stdio.h>
  26 #include <stdio_ext.h>
  27 #include <stdlib.h>
  28 #include <string.h>
  29
  30 #include <aliases.h>
  31 #include <grp.h>
  32 #include <netinet/ether.h>
  33 #include <pwd.h>
  34 #include <shadow.h>
  35
  36 #if !defined DO_STATIC_NSS || defined SHARED
  37 # include <gnu/lib-names.h>
  38 #endif
  39
  40 #include "nsswitch.h"
  41 #include "../nscd/nscd_proto.h"
  42 #include <sysdep.h>
  43
  44 /* Prototypes for the local functions.  */
  45 static name_database *nss_parse_file (const char *fname);
  46 static name_database_entry *nss_getline (char *line);
  47 static service_user *nss_parse_service_list (const char *line);
  48 #if !defined DO_STATIC_NSS || defined SHARED
  49 static service_library *nss_new_service (name_database *database,
  50                                          const char *name);
  51 #endif
  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 #ifdef USE_NSCD
  76 /* Flags whether custom rules for database is set.  */
  77 bool __nss_database_custom[NSS_DBSIDX_max];
  78 #endif
  79
  80
  81 __libc_lock_define_initialized (static, lock)
  82
  83 #if !defined DO_STATIC_NSS || defined SHARED
  84 /* String with revision number of the shared object files.  */
  85 static const char *const __nss_shlib_revision = LIBNSS_FILES_SO + 15;
  86 #endif
  87
  88 /* The root of the whole data base.  */
  89 static name_database *service_table;
  90
  91 /* List of default service lists that were generated by glibc because
  92    /etc/nsswitch.conf did not provide a value.
  93    The list is only maintained so we can free such service lists in
  94    __libc_freeres.  */
  95 static name_database_entry *defconfig_entries;
  96
  97
  98 #if defined USE_NSCD && (!defined DO_STATIC_NSS || defined SHARED)
  99 /* Nonzero if this is the nscd process.  */
 100 static bool is_nscd;
 101 /* The callback passed to the init functions when nscd is used.  */
 102 static void (*nscd_init_cb) (size_t, struct traced_file *);
 103 #endif
 104
 105
 106 /* -1 == database not found
 107     0 == database entry pointer stored */
 108 int
 109 __nss_database_lookup (const char *database, const char *alternate_name,
 110                        const char *defconfig, service_user **ni)
 111 {
 112   /* Prevent multiple threads to change the service table.  */
 113   __libc_lock_lock (lock);
 114
 115   /* Reconsider database variable in case some other thread called
 116      `__nss_configure_lookup' while we waited for the lock.  */
 117   if (*ni != NULL)
 118     {
 119       __libc_lock_unlock (lock);
 120       return 0;
 121     }
 122
 123   /* Are we initialized yet?  */
 124   if (service_table == NULL)
 125     /* Read config file.  */
 126     service_table = nss_parse_file (_PATH_NSSWITCH_CONF);
 127
 128   /* Test whether configuration data is available.  */
 129   if (service_table != NULL)
 130     {
 131       /* Return first `service_user' entry for DATABASE.  */
 132       name_database_entry *entry;
 133
 134       /* XXX Could use some faster mechanism here.  But each database is
 135          only requested once and so this might not be critical.  */
 136       for (entry = service_table->entry; entry != NULL; entry = entry->next)
 137         if (strcmp (database, entry->name) == 0)
 138           *ni = entry->service;
 139
 140       if (*ni == NULL && alternate_name != NULL)
 141         /* We haven't found an entry so far.  Try to find it with the
 142            alternative name.  */
 143         for (entry = service_table->entry; entry != NULL; entry = entry->next)
 144           if (strcmp (alternate_name, entry->name) == 0)
 145             *ni = entry->service;
 146     }
 147
 148   /* No configuration data is available, either because nsswitch.conf
 149      doesn't exist or because it doesn't have a line for this database.
 150
 151      DEFCONFIG specifies the default service list for this database,
 152      or null to use the most common default.  */
 153   if (*ni == NULL)
 154     {
 155       *ni = nss_parse_service_list (defconfig
 156                                     ?: "nis [NOTFOUND=return] files");
 157       if (*ni != NULL)
 158         {
 159           /* Record the memory we've just allocated in defconfig_entries list,
 160              so we can free it later.  */
 161           name_database_entry *entry;
 162
 163           /* Allocate ENTRY plus size of name (1 here).  */
 164           entry = (name_database_entry *) malloc (sizeof (*entry) + 1);
 165
 166           if (entry != NULL)
 167             {
 168               entry->next = defconfig_entries;
 169               entry->service = *ni;
 170               entry->name[0] = '\0';
 171               defconfig_entries = entry;
 172             }
 173         }
 174     }
 175
 176   __libc_lock_unlock (lock);
 177
 178   return *ni != NULL ? 0 : -1;
 179 }
 180 libc_hidden_def (__nss_database_lookup)
 181
 182
 183 /* -1 == not found
 184     0 == function found
 185     1 == finished */
 186 int
 187 __nss_lookup (service_user **ni, const char *fct_name, const char *fct2_name,
 188               void **fctp)
 189 {
 190   *fctp = __nss_lookup_function (*ni, fct_name);
 191   if (*fctp == NULL && fct2_name != NULL)
 192     *fctp = __nss_lookup_function (*ni, fct2_name);
 193
 194   while (*fctp == NULL
 195          && nss_next_action (*ni, NSS_STATUS_UNAVAIL) == NSS_ACTION_CONTINUE
 196          && (*ni)->next != NULL)
 197     {
 198       *ni = (*ni)->next;
 199
 200       *fctp = __nss_lookup_function (*ni, fct_name);
 201       if (*fctp == NULL && fct2_name != NULL)
 202         *fctp = __nss_lookup_function (*ni, fct2_name);
 203     }
 204
 205   return *fctp != NULL ? 0 : (*ni)->next == NULL ? 1 : -1;
 206 }
 207 libc_hidden_def (__nss_lookup)
 208
 209
 210 /* -1 == not found
 211     0 == adjusted for next function
 212     1 == finished */
 213 int
 214 __nss_next2 (service_user **ni, const char *fct_name, const char *fct2_name,
 215              void **fctp, int status, int all_values)
 216 {
 217   if (all_values)
 218     {
 219       if (nss_next_action (*ni, NSS_STATUS_TRYAGAIN) == NSS_ACTION_RETURN
 220           && nss_next_action (*ni, NSS_STATUS_UNAVAIL) == NSS_ACTION_RETURN
 221           && nss_next_action (*ni, NSS_STATUS_NOTFOUND) == NSS_ACTION_RETURN
 222           && nss_next_action (*ni, NSS_STATUS_SUCCESS) == NSS_ACTION_RETURN)
 223         return 1;
 224     }
 225   else
 226     {
 227       /* This is really only for debugging.  */
 228       if (__builtin_expect (NSS_STATUS_TRYAGAIN > status
 229                             || status > NSS_STATUS_RETURN, 0))
 230          __libc_fatal ("illegal status in __nss_next");
 231
 232        if (nss_next_action (*ni, status) == NSS_ACTION_RETURN)
 233          return 1;
 234     }
 235
 236   if ((*ni)->next == NULL)
 237     return -1;
 238
 239   do
 240     {
 241       *ni = (*ni)->next;
 242
 243       *fctp = __nss_lookup_function (*ni, fct_name);
 244       if (*fctp == NULL && fct2_name != NULL)
 245         *fctp = __nss_lookup_function (*ni, fct2_name);
 246     }
 247   while (*fctp == NULL
 248          && nss_next_action (*ni, NSS_STATUS_UNAVAIL) == NSS_ACTION_CONTINUE
 249          && (*ni)->next != NULL);
 250
 251   return *fctp != NULL ? 0 : -1;
 252 }
 253 libc_hidden_def (__nss_next2)
 254
 255
 256 int
 257 attribute_compat_text_section
 258 __nss_next (service_user **ni, const char *fct_name, void **fctp, int status,
 259             int all_values)
 260 {
 261   return __nss_next2 (ni, fct_name, NULL, fctp, status, all_values);
 262 }
 263
 264
 265 int
 266 __nss_configure_lookup (const char *dbname, const char *service_line)
 267 {
 268   service_user *new_db;
 269   size_t cnt;
 270
 271   for (cnt = 0; cnt < ndatabases; ++cnt)
 272     {
 273       int cmp = strcmp (dbname, databases[cnt].name);
 274       if (cmp == 0)
 275         break;
 276       if (cmp < 0)
 277         {
 278           __set_errno (EINVAL);
 279           return -1;
 280         }
 281     }
 282
 283   if (cnt == ndatabases)
 284     {
 285       __set_errno (EINVAL);
 286       return -1;
 287     }
 288
 289   /* Test whether it is really used.  */
 290   if (databases[cnt].dbp == NULL)
 291     /* Nothing to do, but we could do.  */
 292     return 0;
 293
 294   /* Try to generate new data.  */
 295   new_db = nss_parse_service_list (service_line);
 296   if (new_db == NULL)
 297     {
 298       /* Illegal service specification.  */
 299       __set_errno (EINVAL);
 300       return -1;
 301     }
 302
 303   /* Prevent multiple threads to change the service table.  */
 304   __libc_lock_lock (lock);
 305
 306   /* Install new rules.  */
 307   *databases[cnt].dbp = new_db;
 308 #ifdef USE_NSCD
 309   __nss_database_custom[cnt] = true;
 310 #endif
 311
 312   __libc_lock_unlock (lock);
 313
 314   return 0;
 315 }
 316
 317
 318 /* Comparison function for searching NI->known tree.  */
 319 static int
 320 known_compare (const void *p1, const void *p2)
 321 {
 322   return p1 == p2 ? 0 : strcmp (*(const char *const *) p1,
 323                                 *(const char *const *) p2);
 324 }
 325
 326
 327 #if !defined DO_STATIC_NSS || defined SHARED
 328 /* Load library.  */
 329 static int
 330 nss_load_library (service_user *ni)
 331 {
 332   if (ni->library == NULL)
 333     {
 334       /* This service has not yet been used.  Fetch the service
 335          library for it, creating a new one if need be.  If there
 336          is no service table from the file, this static variable
 337          holds the head of the service_library list made from the
 338          default configuration.  */
 339       static name_database default_table;
 340       ni->library = nss_new_service (service_table ?: &default_table,
 341                                      ni->name);
 342       if (ni->library == NULL)
 343         return -1;
 344     }
 345
 346   if (ni->library->lib_handle == NULL)
 347     {
 348       /* Load the shared library.  */
 349       size_t shlen = (7 + strlen (ni->name) + 3
 350                       + strlen (__nss_shlib_revision) + 1);
 351       int saved_errno = errno;
 352       char shlib_name[shlen];
 353
 354       /* Construct shared object name.  */
 355       __stpcpy (__stpcpy (__stpcpy (__stpcpy (shlib_name,
 356                                               "libnss_"),
 357                                     ni->name),
 358                           ".so"),
 359                 __nss_shlib_revision);
 360
 361       ni->library->lib_handle = __libc_dlopen (shlib_name);
 362       if (ni->library->lib_handle == NULL)
 363         {
 364           /* Failed to load the library.  */
 365           ni->library->lib_handle = (void *) -1l;
 366           __set_errno (saved_errno);
 367         }
 368 # ifdef USE_NSCD
 369       else if (is_nscd)
 370         {
 371           /* Call the init function when nscd is used.  */
 372           size_t initlen = (5 + strlen (ni->name)
 373                             + strlen ("_init") + 1);
 374           char init_name[initlen];
 375
 376           /* Construct the init function name.  */
 377           __stpcpy (__stpcpy (__stpcpy (init_name,
 378                                         "_nss_"),
 379                               ni->name),
 380                     "_init");
 381
 382           /* Find the optional init function.  */
 383           void (*ifct) (void (*) (size_t, struct traced_file *))
 384             = __libc_dlsym (ni->library->lib_handle, init_name);
 385           if (ifct != NULL)
 386             {
 387               void (*cb) (size_t, struct traced_file *) = nscd_init_cb;
 388 #  ifdef PTR_DEMANGLE
 389               PTR_DEMANGLE (cb);
 390 #  endif
 391               ifct (cb);
 392             }
 393         }
 394 # endif
 395     }
 396
 397   return 0;
 398 }
 399 #endif
 400
 401
 402 void *
 403 __nss_lookup_function (service_user *ni, const char *fct_name)
 404 {
 405   void **found, *result;
 406
 407   /* We now modify global data.  Protect it.  */
 408   __libc_lock_lock (lock);
 409
 410   /* Search the tree of functions previously requested.  Data in the
 411      tree are `known_function' structures, whose first member is a
 412      `const char *', the lookup key.  The search returns a pointer to
 413      the tree node structure; the first member of the is a pointer to
 414      our structure (i.e. what will be a `known_function'); since the
 415      first member of that is the lookup key string, &FCT_NAME is close
 416      enough to a pointer to our structure to use as a lookup key that
 417      will be passed to `known_compare' (above).  */
 418
 419   found = __tsearch (&fct_name, &ni->known, &known_compare);
 420   if (found == NULL)
 421     /* This means out-of-memory.  */
 422     result = NULL;
 423   else if (*found != &fct_name)
 424     {
 425       /* The search found an existing structure in the tree.  */
 426       result = ((known_function *) *found)->fct_ptr;
 427 #ifdef PTR_DEMANGLE
 428       PTR_DEMANGLE (result);
 429 #endif
 430     }
 431   else
 432     {
 433       /* This name was not known before.  Now we have a node in the tree
 434          (in the proper sorted position for FCT_NAME) that points to
 435          &FCT_NAME instead of any real `known_function' structure.
 436          Allocate a new structure and fill it in.  */
 437
 438       known_function *known = malloc (sizeof *known);
 439       if (! known)
 440         {
 441 #if !defined DO_STATIC_NSS || defined SHARED
 442         remove_from_tree:
 443 #endif
 444           /* Oops.  We can't instantiate this node properly.
 445              Remove it from the tree.  */
 446           __tdelete (&fct_name, &ni->known, &known_compare);
 447           free (known);
 448           result = NULL;
 449         }
 450       else
 451         {
 452           /* Point the tree node at this new structure.  */
 453           *found = known;
 454           known->fct_name = fct_name;
 455
 456 #if !defined DO_STATIC_NSS || defined SHARED
 457           /* Load the appropriate library.  */
 458           if (nss_load_library (ni) != 0)
 459             /* This only happens when out of memory.  */
 460             goto remove_from_tree;
 461
 462           if (ni->library->lib_handle == (void *) -1l)
 463             /* Library not found => function not found.  */
 464             result = NULL;
 465           else
 466             {
 467               /* Get the desired function.  */
 468               size_t namlen = (5 + strlen (ni->name) + 1
 469                                + strlen (fct_name) + 1);
 470               char name[namlen];
 471
 472               /* Construct the function name.  */
 473               __stpcpy (__stpcpy (__stpcpy (__stpcpy (name, "_nss_"),
 474                                             ni->name),
 475                                   "_"),
 476                         fct_name);
 477
 478               /* Look up the symbol.  */
 479               result = __libc_dlsym (ni->library->lib_handle, name);
 480             }
 481 #else
 482           /* We can't get function address dynamically in static linking. */
 483           {
 484 # define DEFINE_ENT(h,nm)                                                     \
 485             { #h"_get"#nm"ent_r", _nss_##h##_get##nm##ent_r },                \
 486             { #h"_end"#nm"ent", _nss_##h##_end##nm##ent },                    \
 487             { #h"_set"#nm"ent", _nss_##h##_set##nm##ent },
 488 # define DEFINE_GET(h,nm)                                                     \
 489             { #h"_get"#nm"_r", _nss_##h##_get##nm##_r },
 490 # define DEFINE_GETBY(h,nm,ky)                                                \
 491             { #h"_get"#nm"by"#ky"_r", _nss_##h##_get##nm##by##ky##_r },
 492             static struct fct_tbl { const char *fname; void *fp; } *tp, tbl[] =
 493               {
 494 # include "function.def"
 495                 { NULL, NULL }
 496               };
 497             size_t namlen = (5 + strlen (ni->name) + 1
 498                              + strlen (fct_name) + 1);
 499             char name[namlen];
 500
 501             /* Construct the function name.  */
 502             __stpcpy (__stpcpy (__stpcpy (name, ni->name),
 503                                 "_"),
 504                       fct_name);
 505
 506             result = NULL;
 507             for (tp = &tbl[0]; tp->fname; tp++)
 508               if (strcmp (tp->fname, name) == 0)
 509                 {
 510                   result = tp->fp;
 511                   break;
 512                 }
 513           }
 514 #endif
 515
 516           /* Remember function pointer for later calls.  Even if null, we
 517              record it so a second try needn't search the library again.  */
 518           known->fct_ptr = result;
 519 #ifdef PTR_MANGLE
 520           PTR_MANGLE (known->fct_ptr);
 521 #endif
 522         }
 523     }
 524
 525   /* Remove the lock.  */
 526   __libc_lock_unlock (lock);
 527
 528   return result;
 529 }
 530 libc_hidden_def (__nss_lookup_function)
 531
 532
 533 static name_database *
 534 nss_parse_file (const char *fname)
 535 {
 536   FILE *fp;
 537   name_database *result;
 538   name_database_entry *last;
 539   char *line;
 540   size_t len;
 541
 542   /* Open the configuration file.  */
 543   fp = fopen (fname, "rce");
 544   if (fp == NULL)
 545     return NULL;
 546
 547   /* No threads use this stream.  */
 548   __fsetlocking (fp, FSETLOCKING_BYCALLER);
 549
 550   result = (name_database *) malloc (sizeof (name_database));
 551   if (result == NULL)
 552     {
 553       fclose (fp);
 554       return NULL;
 555     }
 556
 557   result->entry = NULL;
 558   result->library = NULL;
 559   last = NULL;
 560   line = NULL;
 561   len = 0;
 562   do
 563     {
 564       name_database_entry *this;
 565       ssize_t n;
 566
 567       n = __getline (&line, &len, fp);
 568       if (n < 0)
 569         break;
 570       if (line[n - 1] == '\n')
 571         line[n - 1] = '\0';
 572
 573       /* Because the file format does not know any form of quoting we
 574          can search forward for the next '#' character and if found
 575          make it terminating the line.  */
 576       *__strchrnul (line, '#') = '\0';
 577
 578       /* If the line is blank it is ignored.  */
 579       if (line[0] == '\0')
 580         continue;
 581
 582       /* Each line completely specifies the actions for a database.  */
 583       this = nss_getline (line);
 584       if (this != NULL)
 585         {
 586           if (last != NULL)
 587             last->next = this;
 588           else
 589             result->entry = this;
 590
 591           last = this;
 592         }
 593     }
 594   while (!feof_unlocked (fp));
 595
 596   /* Free the buffer.  */
 597   free (line);
 598   /* Close configuration file.  */
 599   fclose (fp);
 600
 601   return result;
 602 }
 603
 604
 605 /* Read the source names:
 606         `( <source> ( "[" "!"? (<status> "=" <action> )+ "]" )? )*'
 607    */
 608 static service_user *
 609 nss_parse_service_list (const char *line)
 610 {
 611   service_user *result = NULL, **nextp = &result;
 612
 613   while (1)
 614     {
 615       service_user *new_service;
 616       const char *name;
 617
 618       while (isspace (line[0]))
 619         ++line;
 620       if (line[0] == '\0')
 621         /* No source specified.  */
 622         return result;
 623
 624       /* Read <source> identifier.  */
 625       name = line;
 626       while (line[0] != '\0' && !isspace (line[0]) && line[0] != '[')
 627         ++line;
 628       if (name == line)
 629         return result;
 630
 631
 632       new_service = (service_user *) malloc (sizeof (service_user)
 633                                              + (line - name + 1));
 634       if (new_service == NULL)
 635         return result;
 636
 637       *((char *) __mempcpy (new_service->name, name, line - name)) = '\0';
 638
 639       /* Set default actions.  */
 640       new_service->actions[2 + NSS_STATUS_TRYAGAIN] = NSS_ACTION_CONTINUE;
 641       new_service->actions[2 + NSS_STATUS_UNAVAIL] = NSS_ACTION_CONTINUE;
 642       new_service->actions[2 + NSS_STATUS_NOTFOUND] = NSS_ACTION_CONTINUE;
 643       new_service->actions[2 + NSS_STATUS_SUCCESS] = NSS_ACTION_RETURN;
 644       new_service->actions[2 + NSS_STATUS_RETURN] = NSS_ACTION_RETURN;
 645       new_service->library = NULL;
 646       new_service->known = NULL;
 647       new_service->next = NULL;
 648
 649       while (isspace (line[0]))
 650         ++line;
 651
 652       if (line[0] == '[')
 653         {
 654           /* Read criterions.  */
 655           do
 656             ++line;
 657           while (line[0] != '\0' && isspace (line[0]));
 658
 659           do
 660             {
 661               int not;
 662               enum nss_status status;
 663               lookup_actions action;
 664
 665               /* Grok ! before name to mean all statii but that one.  */
 666               not = line[0] == '!';
 667               if (not)
 668                 ++line;
 669
 670               /* Read status name.  */
 671               name = line;
 672               while (line[0] != '\0' && !isspace (line[0]) && line[0] != '='
 673                      && line[0] != ']')
 674                 ++line;
 675
 676               /* Compare with known statii.  */
 677               if (line - name == 7)
 678                 {
 679                   if (__strncasecmp (name, "SUCCESS", 7) == 0)
 680                     status = NSS_STATUS_SUCCESS;
 681                   else if (__strncasecmp (name, "UNAVAIL", 7) == 0)
 682                     status = NSS_STATUS_UNAVAIL;
 683                   else
 684                     goto finish;
 685                 }
 686               else if (line - name == 8)
 687                 {
 688                   if (__strncasecmp (name, "NOTFOUND", 8) == 0)
 689                     status = NSS_STATUS_NOTFOUND;
 690                   else if (__strncasecmp (name, "TRYAGAIN", 8) == 0)
 691                     status = NSS_STATUS_TRYAGAIN;
 692                   else
 693                     goto finish;
 694                 }
 695               else
 696                 goto finish;
 697
 698               while (isspace (line[0]))
 699                 ++line;
 700               if (line[0] != '=')
 701                 goto finish;
 702               do
 703                 ++line;
 704               while (isspace (line[0]));
 705
 706               name = line;
 707               while (line[0] != '\0' && !isspace (line[0]) && line[0] != '='
 708                      && line[0] != ']')
 709                 ++line;
 710
 711               if (line - name == 6 && __strncasecmp (name, "RETURN", 6) == 0)
 712                 action = NSS_ACTION_RETURN;
 713               else if (line - name == 8
 714                        && __strncasecmp (name, "CONTINUE", 8) == 0)
 715                 action = NSS_ACTION_CONTINUE;
 716               else if (line - name == 5
 717                        && __strncasecmp (name, "MERGE", 5) == 0)
 718                 action = NSS_ACTION_MERGE;
 719               else
 720                 goto finish;
 721
 722               if (not)
 723                 {
 724                   /* Save the current action setting for this status,
 725                      set them all to the given action, and reset this one.  */
 726                   const lookup_actions save = new_service->actions[2 + status];
 727                   new_service->actions[2 + NSS_STATUS_TRYAGAIN] = action;
 728                   new_service->actions[2 + NSS_STATUS_UNAVAIL] = action;
 729                   new_service->actions[2 + NSS_STATUS_NOTFOUND] = action;
 730                   new_service->actions[2 + NSS_STATUS_SUCCESS] = action;
 731                   new_service->actions[2 + status] = save;
 732                 }
 733               else
 734                 new_service->actions[2 + status] = action;
 735
 736               /* Skip white spaces.  */
 737               while (isspace (line[0]))
 738                 ++line;
 739             }
 740           while (line[0] != ']');
 741
 742           /* Skip the ']'.  */
 743           ++line;
 744         }
 745
 746       *nextp = new_service;
 747       nextp = &new_service->next;
 748       continue;
 749
 750     finish:
 751       free (new_service);
 752       return result;
 753     }
 754 }
 755
 756 static name_database_entry *
 757 nss_getline (char *line)
 758 {
 759   const char *name;
 760   name_database_entry *result;
 761   size_t len;
 762
 763   /* Ignore leading white spaces.  ATTENTION: this is different from
 764      what is implemented in Solaris.  The Solaris man page says a line
 765      beginning with a white space character is ignored.  We regard
 766      this as just another misfeature in Solaris.  */
 767   while (isspace (line[0]))
 768     ++line;
 769
 770   /* Recognize `<database> ":"'.  */
 771   name = line;
 772   while (line[0] != '\0' && !isspace (line[0]) && line[0] != ':')
 773     ++line;
 774   if (line[0] == '\0' || name == line)
 775     /* Syntax error.  */
 776     return NULL;
 777   *line++ = '\0';
 778
 779   len = strlen (name) + 1;
 780
 781   result = (name_database_entry *) malloc (sizeof (name_database_entry) + len);
 782   if (result == NULL)
 783     return NULL;
 784
 785   /* Save the database name.  */
 786   memcpy (result->name, name, len);
 787
 788   /* Parse the list of services.  */
 789   result->service = nss_parse_service_list (line);
 790
 791   result->next = NULL;
 792   return result;
 793 }
 794
 795
 796 #if !defined DO_STATIC_NSS || defined SHARED
 797 static service_library *
 798 nss_new_service (name_database *database, const char *name)
 799 {
 800   service_library **currentp = &database->library;
 801
 802   while (*currentp != NULL)
 803     {
 804       if (strcmp ((*currentp)->name, name) == 0)
 805         return *currentp;
 806       currentp = &(*currentp)->next;
 807     }
 808
 809   /* We have to add the new service.  */
 810   *currentp = (service_library *) malloc (sizeof (service_library));
 811   if (*currentp == NULL)
 812     return NULL;
 813
 814   (*currentp)->name = name;
 815   (*currentp)->lib_handle = NULL;
 816   (*currentp)->next = NULL;
 817
 818   return *currentp;
 819 }
 820 #endif
 821
 822
 823 #if defined SHARED && defined USE_NSCD
 824 /* Load all libraries for the service.  */
 825 static void
 826 nss_load_all_libraries (const char *service, const char *def)
 827 {
 828   service_user *ni = NULL;
 829
 830   if (__nss_database_lookup (service, NULL, def, &ni) == 0)
 831     while (ni != NULL)
 832       {
 833         nss_load_library (ni);
 834         ni = ni->next;
 835       }
 836 }
 837
 838
 839 /* Called by nscd and nscd alone.  */
 840 void
 841 __nss_disable_nscd (void (*cb) (size_t, struct traced_file *))
 842 {
 843 # ifdef PTR_MANGLE
 844   PTR_MANGLE (cb);
 845 # endif
 846   nscd_init_cb = cb;
 847   is_nscd = true;
 848
 849   /* Find all the relevant modules so that the init functions are called.  */
 850   nss_load_all_libraries ("passwd", "compat [NOTFOUND=return] files");
 851   nss_load_all_libraries ("group", "compat [NOTFOUND=return] files");
 852   nss_load_all_libraries ("hosts", "dns [!UNAVAIL=return] files");
 853   nss_load_all_libraries ("services", NULL);
 854
 855   /* Disable all uses of NSCD.  */
 856   __nss_not_use_nscd_passwd = -1;
 857   __nss_not_use_nscd_group = -1;
 858   __nss_not_use_nscd_hosts = -1;
 859   __nss_not_use_nscd_services = -1;
 860   __nss_not_use_nscd_netgroup = -1;
 861 }
 862 #endif
 863
 864 static void
 865 free_database_entries (name_database_entry *entry)
 866 {
 867   while (entry != NULL)
 868     {
 869       name_database_entry *olde = entry;
 870       service_user *service = entry->service;
 871
 872       while (service != NULL)
 873         {
 874           service_user *olds = service;
 875
 876           if (service->known != NULL)
 877             __tdestroy (service->known, free);
 878
 879           service = service->next;
 880           free (olds);
 881         }
 882
 883       entry = entry->next;
 884       free (olde);
 885     }
 886 }
 887
 888 /* Free all resources if necessary.  */
 889 libc_freeres_fn (free_defconfig)
 890 {
 891   name_database_entry *entry = defconfig_entries;
 892
 893   if (entry == NULL)
 894     /* defconfig was not used.  */
 895     return;
 896
 897   /* Don't disturb ongoing other threads (if there are any).  */
 898   defconfig_entries = NULL;
 899
 900   free_database_entries (entry);
 901 }
 902
 903 libc_freeres_fn (free_mem)
 904 {
 905   name_database *top = service_table;
 906   service_library *library;
 907
 908   if (top == NULL)
 909     /* Maybe we have not read the nsswitch.conf file.  */
 910     return;
 911
 912   /* Don't disturb ongoing other threads (if there are any).  */
 913   service_table = NULL;
 914
 915   free_database_entries (top->entry);
 916
 917   library = top->library;
 918   while (library != NULL)
 919     {
 920       service_library *oldl = library;
 921
 922       if (library->lib_handle && library->lib_handle != (void *) -1l)
 923         __libc_dlclose (library->lib_handle);
 924
 925       library = library->next;
 926       free (oldl);
 927     }
 928
 929   free (top);
 930 }