nss/nsswitch.c

   1 /* Copyright (C) 1996-1999,2001-2007,2009,2010,2011
   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 #include <sysdep.h>
  45
  46 /* Prototypes for the local functions.  */
  47 static name_database *nss_parse_file (const char *fname) internal_function;
  48 static name_database_entry *nss_getline (char *line) internal_function;
  49 static service_user *nss_parse_service_list (const char *line)
  50      internal_function;
  51 static service_library *nss_new_service (name_database *database,
  52                                          const char *name) internal_function;
  53
  54
  55 /* Declare external database variables.  */
  56 #define DEFINE_DATABASE(name)                                                 \
  57   extern service_user *__nss_##name##_database attribute_hidden;              \
  58   weak_extern (__nss_##name##_database)
  59 #include "databases.def"
  60 #undef DEFINE_DATABASE
  61
  62 /* Structure to map database name to variable.  */
  63 static const struct
  64 {
  65   const char name[10];
  66   service_user **dbp;
  67 } databases[] =
  68 {
  69 #define DEFINE_DATABASE(name)                                                 \
  70   { #name, &__nss_##name##_database },
  71 #include "databases.def"
  72 #undef DEFINE_DATABASE
  73 };
  74 #define ndatabases (sizeof (databases) / sizeof (databases[0]))
  75
  76 /* Flags whether custom rules for database is set.  */
  77 bool __nss_database_custom[NSS_DBSIDX_max];
  78
  79
  80 __libc_lock_define_initialized (static, lock)
  81
  82 #if !defined DO_STATIC_NSS || defined SHARED
  83 /* String with revision number of the shared object files.  */
  84 static const char *const __nss_shlib_revision = LIBNSS_FILES_SO + 15;
  85 #endif
  86
  87 /* The root of the whole data base.  */
  88 static name_database *service_table;
  89
  90
  91 /* Nonzero if this is the nscd process.  */
  92 static bool is_nscd;
  93 /* The callback passed to the init functions when nscd is used.  */
  94 static void (*nscd_init_cb) (size_t, struct traced_file *);
  95
  96
  97 /* -1 == database not found
  98     0 == database entry pointer stored */
  99 int
 100 __nss_database_lookup (const char *database, const char *alternate_name,
 101                        const char *defconfig, service_user **ni)
 102 {
 103   /* Prevent multiple threads to change the service table.  */
 104   __libc_lock_lock (lock);
 105
 106   /* Reconsider database variable in case some other thread called
 107      `__nss_configure_lookup' while we waited for the lock.  */
 108   if (*ni != NULL)
 109     {
 110       __libc_lock_unlock (lock);
 111       return 0;
 112     }
 113
 114   /* Are we initialized yet?  */
 115   if (service_table == NULL)
 116     /* Read config file.  */
 117     service_table = nss_parse_file (_PATH_NSSWITCH_CONF);
 118
 119   /* Test whether configuration data is available.  */
 120   if (service_table != NULL)
 121     {
 122       /* Return first `service_user' entry for DATABASE.  */
 123       name_database_entry *entry;
 124
 125       /* XXX Could use some faster mechanism here.  But each database is
 126          only requested once and so this might not be critical.  */
 127       for (entry = service_table->entry; entry != NULL; entry = entry->next)
 128         if (strcmp (database, entry->name) == 0)
 129           *ni = entry->service;
 130
 131       if (*ni == NULL && alternate_name != NULL)
 132         /* We haven't found an entry so far.  Try to find it with the
 133            alternative name.  */
 134         for (entry = service_table->entry; entry != NULL; entry = entry->next)
 135           if (strcmp (alternate_name, entry->name) == 0)
 136             *ni = entry->service;
 137     }
 138
 139   /* No configuration data is available, either because nsswitch.conf
 140      doesn't exist or because it doesn't have a line for this database.
 141
 142      DEFCONFIG specifies the default service list for this database,
 143      or null to use the most common default.  */
 144   if (*ni == NULL)
 145     *ni = nss_parse_service_list (defconfig
 146                                   ?: "nis [NOTFOUND=return] files");
 147
 148   __libc_lock_unlock (lock);
 149
 150   return *ni != NULL ? 0 : -1;
 151 }
 152 libc_hidden_def (__nss_database_lookup)
 153
 154
 155 /* -1 == not found
 156     0 == function found
 157     1 == finished */
 158 int
 159 __nss_lookup (service_user **ni, const char *fct_name, const char *fct2_name,
 160               void **fctp)
 161 {
 162   *fctp = __nss_lookup_function (*ni, fct_name);
 163   if (*fctp == NULL && fct2_name != NULL)
 164     *fctp = __nss_lookup_function (*ni, fct2_name);
 165
 166   while (*fctp == NULL
 167          && nss_next_action (*ni, NSS_STATUS_UNAVAIL) == NSS_ACTION_CONTINUE
 168          && (*ni)->next != NULL)
 169     {
 170       *ni = (*ni)->next;
 171
 172       *fctp = __nss_lookup_function (*ni, fct_name);
 173       if (*fctp == NULL && fct2_name != NULL)
 174         *fctp = __nss_lookup_function (*ni, fct2_name);
 175     }
 176
 177   return *fctp != NULL ? 0 : (*ni)->next == NULL ? 1 : -1;
 178 }
 179 libc_hidden_def (__nss_lookup)
 180
 181
 182 /* -1 == not found
 183     0 == adjusted for next function
 184     1 == finished */
 185 int
 186 __nss_next2 (service_user **ni, const char *fct_name, const char *fct2_name,
 187              void **fctp, int status, int all_values)
 188 {
 189   if (all_values)
 190     {
 191       if (nss_next_action (*ni, NSS_STATUS_TRYAGAIN) == NSS_ACTION_RETURN
 192           && nss_next_action (*ni, NSS_STATUS_UNAVAIL) == NSS_ACTION_RETURN
 193           && nss_next_action (*ni, NSS_STATUS_NOTFOUND) == NSS_ACTION_RETURN
 194           && nss_next_action (*ni, NSS_STATUS_SUCCESS) == NSS_ACTION_RETURN)
 195         return 1;
 196     }
 197   else
 198     {
 199       /* This is really only for debugging.  */
 200       if (__builtin_expect (NSS_STATUS_TRYAGAIN > status
 201                             || status > NSS_STATUS_RETURN, 0))
 202          __libc_fatal ("illegal status in __nss_next");
 203
 204        if (nss_next_action (*ni, status) == NSS_ACTION_RETURN)
 205          return 1;
 206     }
 207
 208   if ((*ni)->next == NULL)
 209     return -1;
 210
 211   do
 212     {
 213       *ni = (*ni)->next;
 214
 215       *fctp = __nss_lookup_function (*ni, fct_name);
 216       if (*fctp == NULL && fct2_name != NULL)
 217         *fctp = __nss_lookup_function (*ni, fct2_name);
 218     }
 219   while (*fctp == NULL
 220          && nss_next_action (*ni, NSS_STATUS_UNAVAIL) == NSS_ACTION_CONTINUE
 221          && (*ni)->next != NULL);
 222
 223   return *fctp != NULL ? 0 : -1;
 224 }
 225 libc_hidden_def (__nss_next2)
 226
 227
 228 int
 229 attribute_compat_text_section
 230 __nss_next (service_user **ni, const char *fct_name, void **fctp, int status,
 231             int all_values)
 232 {
 233   return __nss_next2 (ni, fct_name, NULL, fctp, status, all_values);
 234 }
 235
 236
 237 int
 238 __nss_configure_lookup (const char *dbname, const char *service_line)
 239 {
 240   service_user *new_db;
 241   size_t cnt;
 242
 243   for (cnt = 0; cnt < ndatabases; ++cnt)
 244     {
 245       int cmp = strcmp (dbname, databases[cnt].name);
 246       if (cmp == 0)
 247         break;
 248       if (cmp < 0)
 249         {
 250           __set_errno (EINVAL);
 251           return -1;
 252         }
 253     }
 254
 255   if (cnt == ndatabases)
 256     {
 257       __set_errno (EINVAL);
 258       return -1;
 259     }
 260
 261   /* Test whether it is really used.  */
 262   if (databases[cnt].dbp == NULL)
 263     /* Nothing to do, but we could do.  */
 264     return 0;
 265
 266   /* Try to generate new data.  */
 267   new_db = nss_parse_service_list (service_line);
 268   if (new_db == NULL)
 269     {
 270       /* Illegal service specification.  */
 271       __set_errno (EINVAL);
 272       return -1;
 273     }
 274
 275   /* Prevent multiple threads to change the service table.  */
 276   __libc_lock_lock (lock);
 277
 278   /* Install new rules.  */
 279   *databases[cnt].dbp = new_db;
 280   __nss_database_custom[cnt] = true;
 281
 282   __libc_lock_unlock (lock);
 283
 284   return 0;
 285 }
 286
 287
 288 /* Comparison function for searching NI->known tree.  */
 289 static int
 290 known_compare (const void *p1, const void *p2)
 291 {
 292   return p1 == p2 ? 0 : strcmp (*(const char *const *) p1,
 293                                 *(const char *const *) p2);
 294 }
 295
 296
 297 #if !defined DO_STATIC_NSS || defined SHARED
 298 /* Load library.  */
 299 static int
 300 nss_load_library (service_user *ni)
 301 {
 302   if (ni->library == NULL)
 303     {
 304       /* This service has not yet been used.  Fetch the service
 305          library for it, creating a new one if need be.  If there
 306          is no service table from the file, this static variable
 307          holds the head of the service_library list made from the
 308          default configuration.  */
 309       static name_database default_table;
 310       ni->library = nss_new_service (service_table ?: &default_table,
 311                                      ni->name);
 312       if (ni->library == NULL)
 313         return -1;
 314     }
 315
 316   if (ni->library->lib_handle == NULL)
 317     {
 318       /* Load the shared library.  */
 319       size_t shlen = (7 + strlen (ni->library->name) + 3
 320                       + strlen (__nss_shlib_revision) + 1);
 321       int saved_errno = errno;
 322       char shlib_name[shlen];
 323
 324       /* Construct shared object name.  */
 325       __stpcpy (__stpcpy (__stpcpy (__stpcpy (shlib_name,
 326                                               "libnss_"),
 327                                     ni->library->name),
 328                           ".so"),
 329                 __nss_shlib_revision);
 330
 331       ni->library->lib_handle = __libc_dlopen (shlib_name);
 332       if (ni->library->lib_handle == NULL)
 333         {
 334           /* Failed to load the library.  */
 335           ni->library->lib_handle = (void *) -1l;
 336           __set_errno (saved_errno);
 337         }
 338       else if (is_nscd)
 339         {
 340           /* Call the init function when nscd is used.  */
 341           size_t initlen = (5 + strlen (ni->library->name)
 342                             + strlen ("_init") + 1);
 343           char init_name[initlen];
 344
 345           /* Construct the init function name.  */
 346           __stpcpy (__stpcpy (__stpcpy (init_name,
 347                                         "_nss_"),
 348                               ni->library->name),
 349                     "_init");
 350
 351           /* Find the optional init function.  */
 352           void (*ifct) (void (*) (size_t, struct traced_file *))
 353             = __libc_dlsym (ni->library->lib_handle, init_name);
 354           if (ifct != NULL)
 355             {
 356               void (*cb) (size_t, struct traced_file *) = nscd_init_cb;
 357 # ifdef PTR_DEMANGLE
 358               PTR_DEMANGLE (cb);
 359 # endif
 360               ifct (cb);
 361             }
 362         }
 363     }
 364
 365   return 0;
 366 }
 367 #endif
 368
 369
 370 void *
 371 __nss_lookup_function (service_user *ni, const char *fct_name)
 372 {
 373   void **found, *result;
 374
 375   /* We now modify global data.  Protect it.  */
 376   __libc_lock_lock (lock);
 377
 378   /* Search the tree of functions previously requested.  Data in the
 379      tree are `known_function' structures, whose first member is a
 380      `const char *', the lookup key.  The search returns a pointer to
 381      the tree node structure; the first member of the is a pointer to
 382      our structure (i.e. what will be a `known_function'); since the
 383      first member of that is the lookup key string, &FCT_NAME is close
 384      enough to a pointer to our structure to use as a lookup key that
 385      will be passed to `known_compare' (above).  */
 386
 387   found = __tsearch (&fct_name, &ni->known, &known_compare);
 388   if (found == NULL)
 389     /* This means out-of-memory.  */
 390     result = NULL;
 391   else if (*found != &fct_name)
 392     {
 393       /* The search found an existing structure in the tree.  */
 394       result = ((known_function *) *found)->fct_ptr;
 395       PTR_DEMANGLE (result);
 396     }
 397   else
 398     {
 399       /* This name was not known before.  Now we have a node in the tree
 400          (in the proper sorted position for FCT_NAME) that points to
 401          &FCT_NAME instead of any real `known_function' structure.
 402          Allocate a new structure and fill it in.  */
 403
 404       known_function *known = malloc (sizeof *known);
 405       if (! known)
 406         {
 407         remove_from_tree:
 408           /* Oops.  We can't instantiate this node properly.
 409              Remove it from the tree.  */
 410           __tdelete (&fct_name, &ni->known, &known_compare);
 411           free (known);
 412           result = NULL;
 413         }
 414       else
 415         {
 416           /* Point the tree node at this new structure.  */
 417           *found = known;
 418           known->fct_name = fct_name;
 419
 420 #if !defined DO_STATIC_NSS || defined SHARED
 421           /* Load the appropriate library.  */
 422           if (nss_load_library (ni) != 0)
 423             /* This only happens when out of memory.  */
 424             goto remove_from_tree;
 425
 426           if (ni->library->lib_handle == (void *) -1l)
 427             /* Library not found => function not found.  */
 428             result = NULL;
 429           else
 430             {
 431               /* Get the desired function.  */
 432               size_t namlen = (5 + strlen (ni->library->name) + 1
 433                                + strlen (fct_name) + 1);
 434               char name[namlen];
 435
 436               /* Construct the function name.  */
 437               __stpcpy (__stpcpy (__stpcpy (__stpcpy (name, "_nss_"),
 438                                             ni->library->name),
 439                                   "_"),
 440                         fct_name);
 441
 442               /* Look up the symbol.  */
 443               result = __libc_dlsym (ni->library->lib_handle, name);
 444             }
 445 #else
 446           /* We can't get function address dynamically in static linking. */
 447           {
 448 # define DEFINE_ENT(h,nm)                                                     \
 449             { #h"_get"#nm"ent_r", _nss_##h##_get##nm##ent_r },                \
 450             { #h"_end"#nm"ent", _nss_##h##_end##nm##ent },                    \
 451             { #h"_set"#nm"ent", _nss_##h##_set##nm##ent },
 452 # define DEFINE_GET(h,nm)                                                     \
 453             { #h"_get"#nm"_r", _nss_##h##_get##nm##_r },
 454 # define DEFINE_GETBY(h,nm,ky)                                                \
 455             { #h"_get"#nm"by"#ky"_r", _nss_##h##_get##nm##by##ky##_r },
 456             static struct fct_tbl { const char *fname; void *fp; } *tp, tbl[] =
 457               {
 458 # include "function.def"
 459                 { NULL, NULL }
 460               };
 461             size_t namlen = (5 + strlen (ni->library->name) + 1
 462                              + strlen (fct_name) + 1);
 463             char name[namlen];
 464
 465             /* Construct the function name.  */
 466             __stpcpy (__stpcpy (__stpcpy (name, ni->library->name),
 467                                 "_"),
 468                       fct_name);
 469
 470             result = NULL;
 471             for (tp = &tbl[0]; tp->fname; tp++)
 472               if (strcmp (tp->fname, name) == 0)
 473                 {
 474                   result = tp->fp;
 475                   break;
 476                 }
 477           }
 478 #endif
 479
 480           /* Remember function pointer for later calls.  Even if null, we
 481              record it so a second try needn't search the library again.  */
 482           known->fct_ptr = result;
 483           PTR_MANGLE (known->fct_ptr);
 484         }
 485     }
 486
 487   /* Remove the lock.  */
 488   __libc_lock_unlock (lock);
 489
 490   return result;
 491 }
 492 libc_hidden_def (__nss_lookup_function)
 493
 494
 495 static name_database *
 496 internal_function
 497 nss_parse_file (const char *fname)
 498 {
 499   FILE *fp;
 500   name_database *result;
 501   name_database_entry *last;
 502   char *line;
 503   size_t len;
 504
 505   /* Open the configuration file.  */
 506   fp = fopen (fname, "rce");
 507   if (fp == NULL)
 508     return NULL;
 509
 510   /* No threads use this stream.  */
 511   __fsetlocking (fp, FSETLOCKING_BYCALLER);
 512
 513   result = (name_database *) malloc (sizeof (name_database));
 514   if (result == NULL)
 515     {
 516       fclose (fp);
 517       return NULL;
 518     }
 519
 520   result->entry = NULL;
 521   result->library = NULL;
 522   last = NULL;
 523   line = NULL;
 524   len = 0;
 525   do
 526     {
 527       name_database_entry *this;
 528       ssize_t n;
 529
 530       n = __getline (&line, &len, fp);
 531       if (n < 0)
 532         break;
 533       if (line[n - 1] == '\n')
 534         line[n - 1] = '\0';
 535
 536       /* Because the file format does not know any form of quoting we
 537          can search forward for the next '#' character and if found
 538          make it terminating the line.  */
 539       *__strchrnul (line, '#') = '\0';
 540
 541       /* If the line is blank it is ignored.  */
 542       if (line[0] == '\0')
 543         continue;
 544
 545       /* Each line completely specifies the actions for a database.  */
 546       this = nss_getline (line);
 547       if (this != NULL)
 548         {
 549           if (last != NULL)
 550             last->next = this;
 551           else
 552             result->entry = this;
 553
 554           last = this;
 555         }
 556     }
 557   while (!feof_unlocked (fp));
 558
 559   /* Free the buffer.  */
 560   free (line);
 561   /* Close configuration file.  */
 562   fclose (fp);
 563
 564   return result;
 565 }
 566
 567
 568 /* Read the source names:
 569         `( <source> ( "[" "!"? (<status> "=" <action> )+ "]" )? )*'
 570    */
 571 static service_user *
 572 internal_function
 573 nss_parse_service_list (const char *line)
 574 {
 575   service_user *result = NULL, **nextp = &result;
 576
 577   while (1)
 578     {
 579       service_user *new_service;
 580       const char *name;
 581
 582       while (isspace (line[0]))
 583         ++line;
 584       if (line[0] == '\0')
 585         /* No source specified.  */
 586         return result;
 587
 588       /* Read <source> identifier.  */
 589       name = line;
 590       while (line[0] != '\0' && !isspace (line[0]) && line[0] != '[')
 591         ++line;
 592       if (name == line)
 593         return result;
 594
 595
 596       new_service = (service_user *) malloc (sizeof (service_user)
 597                                              + (line - name + 1));
 598       if (new_service == NULL)
 599         return result;
 600
 601       *((char *) __mempcpy (new_service->name, name, line - name)) = '\0';
 602
 603       /* Set default actions.  */
 604       new_service->actions[2 + NSS_STATUS_TRYAGAIN] = NSS_ACTION_CONTINUE;
 605       new_service->actions[2 + NSS_STATUS_UNAVAIL] = NSS_ACTION_CONTINUE;
 606       new_service->actions[2 + NSS_STATUS_NOTFOUND] = NSS_ACTION_CONTINUE;
 607       new_service->actions[2 + NSS_STATUS_SUCCESS] = NSS_ACTION_RETURN;
 608       new_service->actions[2 + NSS_STATUS_RETURN] = NSS_ACTION_RETURN;
 609       new_service->library = NULL;
 610       new_service->known = NULL;
 611       new_service->next = NULL;
 612
 613       while (isspace (line[0]))
 614         ++line;
 615
 616       if (line[0] == '[')
 617         {
 618           /* Read criterions.  */
 619           do
 620             ++line;
 621           while (line[0] != '\0' && isspace (line[0]));
 622
 623           do
 624             {
 625               int not;
 626               enum nss_status status;
 627               lookup_actions action;
 628
 629               /* Grok ! before name to mean all statii but that one.  */
 630               not = line[0] == '!';
 631               if (not)
 632                 ++line;
 633
 634               /* Read status name.  */
 635               name = line;
 636               while (line[0] != '\0' && !isspace (line[0]) && line[0] != '='
 637                      && line[0] != ']')
 638                 ++line;
 639
 640               /* Compare with known statii.  */
 641               if (line - name == 7)
 642                 {
 643                   if (__strncasecmp (name, "SUCCESS", 7) == 0)
 644                     status = NSS_STATUS_SUCCESS;
 645                   else if (__strncasecmp (name, "UNAVAIL", 7) == 0)
 646                     status = NSS_STATUS_UNAVAIL;
 647                   else
 648                     return result;
 649                 }
 650               else if (line - name == 8)
 651                 {
 652                   if (__strncasecmp (name, "NOTFOUND", 8) == 0)
 653                     status = NSS_STATUS_NOTFOUND;
 654                   else if (__strncasecmp (name, "TRYAGAIN", 8) == 0)
 655                     status = NSS_STATUS_TRYAGAIN;
 656                   else
 657                     return result;
 658                 }
 659               else
 660                 return result;
 661
 662               while (isspace (line[0]))
 663                 ++line;
 664               if (line[0] != '=')
 665                 return result;
 666               do
 667                 ++line;
 668               while (isspace (line[0]));
 669
 670               name = line;
 671               while (line[0] != '\0' && !isspace (line[0]) && line[0] != '='
 672                      && line[0] != ']')
 673                 ++line;
 674
 675               if (line - name == 6 && __strncasecmp (name, "RETURN", 6) == 0)
 676                 action = NSS_ACTION_RETURN;
 677               else if (line - name == 8
 678                        && __strncasecmp (name, "CONTINUE", 8) == 0)
 679                 action = NSS_ACTION_CONTINUE;
 680               else
 681                 return result;
 682
 683               if (not)
 684                 {
 685                   /* Save the current action setting for this status,
 686                      set them all to the given action, and reset this one.  */
 687                   const lookup_actions save = new_service->actions[2 + status];
 688                   new_service->actions[2 + NSS_STATUS_TRYAGAIN] = action;
 689                   new_service->actions[2 + NSS_STATUS_UNAVAIL] = action;
 690                   new_service->actions[2 + NSS_STATUS_NOTFOUND] = action;
 691                   new_service->actions[2 + NSS_STATUS_SUCCESS] = action;
 692                   new_service->actions[2 + status] = save;
 693                 }
 694               else
 695                 new_service->actions[2 + status] = action;
 696
 697               /* Skip white spaces.  */
 698               while (isspace (line[0]))
 699                 ++line;
 700             }
 701           while (line[0] != ']');
 702
 703           /* Skip the ']'.  */
 704           ++line;
 705         }
 706
 707       *nextp = new_service;
 708       nextp = &new_service->next;
 709     }
 710 }
 711
 712 static name_database_entry *
 713 internal_function
 714 nss_getline (char *line)
 715 {
 716   const char *name;
 717   name_database_entry *result;
 718   size_t len;
 719
 720   /* Ignore leading white spaces.  ATTENTION: this is different from
 721      what is implemented in Solaris.  The Solaris man page says a line
 722      beginning with a white space character is ignored.  We regard
 723      this as just another misfeature in Solaris.  */
 724   while (isspace (line[0]))
 725     ++line;
 726
 727   /* Recognize `<database> ":"'.  */
 728   name = line;
 729   while (line[0] != '\0' && !isspace (line[0]) && line[0] != ':')
 730     ++line;
 731   if (line[0] == '\0' || name == line)
 732     /* Syntax error.  */
 733     return NULL;
 734   *line++ = '\0';
 735
 736   len = strlen (name) + 1;
 737
 738   result = (name_database_entry *) malloc (sizeof (name_database_entry) + len);
 739   if (result == NULL)
 740     return NULL;
 741
 742   /* Save the database name.  */
 743   memcpy (result->name, name, len);
 744
 745   /* Parse the list of services.  */
 746   result->service = nss_parse_service_list (line);
 747
 748   result->next = NULL;
 749   return result;
 750 }
 751
 752
 753 static service_library *
 754 internal_function
 755 nss_new_service (name_database *database, const char *name)
 756 {
 757   service_library **currentp = &database->library;
 758
 759   while (*currentp != NULL)
 760     {
 761       if (strcmp ((*currentp)->name, name) == 0)
 762         return *currentp;
 763       currentp = &(*currentp)->next;
 764     }
 765
 766   /* We have to add the new service.  */
 767   *currentp = (service_library *) malloc (sizeof (service_library));
 768   if (*currentp == NULL)
 769     return NULL;
 770
 771   (*currentp)->name = name;
 772   (*currentp)->lib_handle = NULL;
 773   (*currentp)->next = NULL;
 774
 775   return *currentp;
 776 }
 777
 778
 779 #ifdef SHARED
 780 /* Load all libraries for the service.  */
 781 static void
 782 nss_load_all_libraries (const char *service, const char *def)
 783 {
 784   service_user *ni = NULL;
 785
 786   if (__nss_database_lookup (service, NULL, def, &ni) == 0)
 787     while (ni != NULL)
 788       {
 789         nss_load_library (ni);
 790         ni = ni->next;
 791       }
 792 }
 793
 794
 795 /* Called by nscd and nscd alone.  */
 796 void
 797 __nss_disable_nscd (void (*cb) (size_t, struct traced_file *))
 798 {
 799 # ifdef PTR_MANGLE
 800   PTR_MANGLE (cb);
 801 # endif
 802   nscd_init_cb = cb;
 803   is_nscd = true;
 804
 805   /* Find all the relevant modules so that the init functions are called.  */
 806   nss_load_all_libraries ("passwd", "compat [NOTFOUND=return] files");
 807   nss_load_all_libraries ("group", "compat [NOTFOUND=return] files");
 808   nss_load_all_libraries ("hosts", "dns [!UNAVAIL=return] files");
 809   nss_load_all_libraries ("services", NULL);
 810
 811   /* Disable all uses of NSCD.  */
 812   __nss_not_use_nscd_passwd = -1;
 813   __nss_not_use_nscd_group = -1;
 814   __nss_not_use_nscd_hosts = -1;
 815   __nss_not_use_nscd_services = -1;
 816   __nss_not_use_nscd_netgroup = -1;
 817 }
 818 #endif
 819
 820
 821 /* Free all resources if necessary.  */
 822 libc_freeres_fn (free_mem)
 823 {
 824   name_database *top = service_table;
 825   name_database_entry *entry;
 826   service_library *library;
 827
 828   if (top == NULL)
 829     /* Maybe we have not read the nsswitch.conf file.  */
 830     return;
 831
 832   /* Don't disturb ongoing other threads (if there are any).  */
 833   service_table = NULL;
 834
 835   entry = top->entry;
 836   while (entry != NULL)
 837     {
 838       name_database_entry *olde = entry;
 839       service_user *service = entry->service;
 840
 841       while (service != NULL)
 842         {
 843           service_user *olds = service;
 844
 845           if (service->known != NULL)
 846             __tdestroy (service->known, free);
 847
 848           service = service->next;
 849           free (olds);
 850         }
 851
 852       entry = entry->next;
 853       free (olde);
 854     }
 855
 856   library = top->library;
 857   while (library != NULL)
 858     {
 859       service_library *oldl = library;
 860
 861       if (library->lib_handle && library->lib_handle != (void *) -1l)
 862         __libc_dlclose (library->lib_handle);
 863
 864       library = library->next;
 865       free (oldl);
 866     }
 867
 868   free (top);
 869 }