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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.18.0/] [newlib/] [libc/] [sys/] [linux/] [net/] [nsswitch.c] - Blame information for rev 207

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/* Copyright (C) 1996, 1997, 1998, 1999, 2001, 2002, 2003, 2004
   Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
 
   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.
 
   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.
 
   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */
 
#include <ctype.h>
#include <dlfcn.h>
#include <errno.h>
#include <netdb.h>
#include <bits/libc-lock.h>
#include <search.h>
#include <stdio.h>
#include <stdio_ext.h>
#include <stdlib.h>
#include <string.h>
 
#include <aliases.h>
#include <grp.h>
#include <netinet/ether.h>
#include <pwd.h>
#include <shadow.h>
 
#include "local.h"
 
#if !defined DO_STATIC_NSS || defined SHARED
# include <gnu/lib-names.h>
#endif
 
#include "nsswitch.h"
#include "nscd/nscd_proto.h"
 
/* Prototypes for the local functions.  */
static name_database *nss_parse_file (const char *fname) internal_function;
static name_database_entry *nss_getline (char *line) internal_function;
static service_user *nss_parse_service_list (const char *line)
     internal_function;
static service_library *nss_new_service (name_database *database,
                                         const char *name) internal_function;
 
 
/* Declare external database variables.  */
#define DEFINE_DATABASE(name)                                                 \
  extern service_user *__nss_##name##_database attribute_hidden;              \
  weak_extern (__nss_##name##_database)
#include "databases.def"
#undef DEFINE_DATABASE
 
/* Structure to map database name to variable.  */
static struct
{
  const char *name;
  service_user **dbp;
} databases[] =
{
#define DEFINE_DATABASE(name)                                                 \
  { #name, &__nss_##name##_database },
#include "databases.def"
#undef DEFINE_DATABASE
};
 
 
__libc_lock_define_initialized (static, lock)
 
#if !defined DO_STATIC_NSS || defined SHARED
/* String with revision number of the shared object files.  */
static const char *const __nss_shlib_revision = LIBNSS_FILES_SO + 15;
#endif
 
/* The root of the whole data base.  */
static name_database *service_table;
 
 
/* -1 == database not found
 
int
__nss_database_lookup (const char *database, const char *alternate_name,
                       const char *defconfig, service_user **ni)
{
  /* Prevent multiple threads to change the service table.  */
  __libc_lock_lock (lock);
 
  /* Reconsider database variable in case some other thread called
     `__nss_configure_lookup' while we waited for the lock.  */
  if (*ni != NULL)
    {
      __libc_lock_unlock (lock);
      return 0;
    }
 
  /* Are we initialized yet?  */
  if (service_table == NULL)
    /* Read config file.  */
    service_table = nss_parse_file (_PATH_NSSWITCH_CONF);
 
  /* Test whether configuration data is available.  */
  if (service_table != NULL)
    {
      /* Return first `service_user' entry for DATABASE.  */
      name_database_entry *entry;
 
      /* XXX Could use some faster mechanism here.  But each database is
         only requested once and so this might not be critical.  */
      for (entry = service_table->entry; entry != NULL; entry = entry->next)
        if (strcmp (database, entry->name) == 0)
          *ni = entry->service;
 
      if (*ni == NULL && alternate_name != NULL)
        /* We haven't found an entry so far.  Try to find it with the
           alternative name.  */
        for (entry = service_table->entry; entry != NULL; entry = entry->next)
          if (strcmp (alternate_name, entry->name) == 0)
            *ni = entry->service;
    }
 
  /* No configuration data is available, either because nsswitch.conf
     doesn't exist or because it doesn't has a line for this database.
 
     DEFCONFIG specifies the default service list for this database,
     or null to use the most common default.  */
  if (*ni == NULL)
    *ni = nss_parse_service_list (defconfig
                                  ?: "nis [NOTFOUND=return] files");
 
  __libc_lock_unlock (lock);
 
  return 0;
}
libc_hidden_def (__nss_database_lookup)
 
 
/* -1 == not found
 
    1 == finished */
int
__nss_lookup (service_user **ni, const char *fct_name, void **fctp)
{
  *fctp = __nss_lookup_function (*ni, fct_name);
 
  while (*fctp == NULL
         && nss_next_action (*ni, NSS_STATUS_UNAVAIL) == NSS_ACTION_CONTINUE
         && (*ni)->next != NULL)
    {
      *ni = (*ni)->next;
 
      *fctp = __nss_lookup_function (*ni, fct_name);
    }
 
  return *fctp != NULL ? 0 : (*ni)->next == NULL ? 1 : -1;
}
 
 
/* -1 == not found
 
    1 == finished */
int
__nss_next (service_user **ni, const char *fct_name, void **fctp, int status,
            int all_values)
{
  if (all_values)
    {
      if (nss_next_action (*ni, NSS_STATUS_TRYAGAIN) == NSS_ACTION_RETURN
          && nss_next_action (*ni, NSS_STATUS_UNAVAIL) == NSS_ACTION_RETURN
          && nss_next_action (*ni, NSS_STATUS_NOTFOUND) == NSS_ACTION_RETURN
          && nss_next_action (*ni, NSS_STATUS_SUCCESS) == NSS_ACTION_RETURN)
        return 1;
    }
  else
    {
      /* This is really only for debugging.  */
       if (NSS_STATUS_TRYAGAIN > status || status > NSS_STATUS_RETURN)
         {
            fprintf (stderr, "illegal status in __nss_next");
            abort();
         }
 
       if (nss_next_action (*ni, status) == NSS_ACTION_RETURN)
         return 1;
    }
 
  if ((*ni)->next == NULL)
    return -1;
 
  do
    {
      *ni = (*ni)->next;
 
      *fctp = __nss_lookup_function (*ni, fct_name);
    }
  while (*fctp == NULL
         && nss_next_action (*ni, NSS_STATUS_UNAVAIL) == NSS_ACTION_CONTINUE
         && (*ni)->next != NULL);
 
  return *fctp != NULL ? 0 : -1;
}
libc_hidden_def (__nss_next)
 
 
int
__nss_configure_lookup (const char *dbname, const char *service_line)
{
  service_user *new_db;
  size_t cnt;
 
  for (cnt = 0; cnt < sizeof databases; ++cnt)
    {
      int cmp = strcmp (dbname, databases[cnt].name);
      if (cmp == 0)
        break;
      if (cmp < 0)
        {
          __set_errno (EINVAL);
          return -1;
        }
    }
 
  if (cnt == sizeof databases)
    {
      __set_errno (EINVAL);
      return -1;
    }
 
  /* Test whether it is really used.  */
  if (databases[cnt].dbp == NULL)
    /* Nothing to do, but we could do.  */
    return 0;
 
  /* Try to generate new data.  */
  new_db = nss_parse_service_list (service_line);
  if (new_db == NULL)
    {
      /* Illegal service specification.  */
      __set_errno (EINVAL);
      return -1;
    }
 
  /* Prevent multiple threads to change the service table.  */
  __libc_lock_lock (lock);
 
  /* Install new rules.  */
  *databases[cnt].dbp = new_db;
 
  __libc_lock_unlock (lock);
 
  return 0;
}
 
 
/* Comparison function for searching NI->known tree.  */
static int
known_compare (const void *p1, const void *p2)
{
  return p1 == p2 ? 0 : strcmp (*(const char *const *) p1,
                                *(const char *const *) p2);
}
 
 
void *
__nss_lookup_function (service_user *ni, const char *fct_name)
{
  void **found, *result;
 
  /* We now modify global data.  Protect it.  */
  __libc_lock_lock (lock);
 
  /* Search the tree of functions previously requested.  Data in the
     tree are `known_function' structures, whose first member is a
     `const char *', the lookup key.  The search returns a pointer to
     the tree node structure; the first member of the is a pointer to
     our structure (i.e. what will be a `known_function'); since the
     first member of that is the lookup key string, &FCT_NAME is close
     enough to a pointer to our structure to use as a lookup key that
     will be passed to `known_compare' (above).  */
 
  found = tsearch (&fct_name, (void **) &ni->known, &known_compare);
  if (*found != &fct_name)
    /* The search found an existing structure in the tree.  */
    result = ((known_function *) *found)->fct_ptr;
  else
    {
      /* This name was not known before.  Now we have a node in the tree
         (in the proper sorted position for FCT_NAME) that points to
         &FCT_NAME instead of any real `known_function' structure.
         Allocate a new structure and fill it in.  */
 
      known_function *known = malloc (sizeof *known);
      if (! known)
        {
        remove_from_tree:
          /* Oops.  We can't instantiate this node properly.
             Remove it from the tree.  */
          tdelete (&fct_name, (void **) &ni->known, &known_compare);
          result = NULL;
        }
      else
        {
          /* Point the tree node at this new structure.  */
          *found = known;
          known->fct_name = fct_name;
 
          if (ni->library == NULL)
            {
              /* This service has not yet been used.  Fetch the service
                 library for it, creating a new one if need be.  If there
                 is no service table from the file, this static variable
                 holds the head of the service_library list made from the
                 default configuration.  */
              static name_database default_table;
              ni->library = nss_new_service (service_table ?: &default_table,
                                             ni->name);
              if (ni->library == NULL)
                {
                  /* This only happens when out of memory.  */
                  free (known);
                  goto remove_from_tree;
                }
            }
 
#if !defined DO_STATIC_NSS || defined SHARED
          if (ni->library->lib_handle == NULL)
            {
              /* Load the shared library.  */
              size_t shlen = (7 + strlen (ni->library->name) + 3
                              + strlen (__nss_shlib_revision) + 1);
              int saved_errno = errno;
              char shlib_name[shlen];
 
              /* Construct shared object name.  */
              stpcpy (stpcpy (stpcpy (stpcpy (shlib_name,
                                                      "libnss_"),
                                            ni->library->name),
                                  ".so"),
                        __nss_shlib_revision);
 
              ni->library->lib_handle = __libc_dlopen (shlib_name);
              if (ni->library->lib_handle == NULL)
                {
                  /* Failed to load the library.  */
                  ni->library->lib_handle = (void *) -1l;
                  __set_errno (saved_errno);
                }
            }
 
          if (ni->library->lib_handle == (void *) -1l)
            /* Library not found => function not found.  */
            result = NULL;
          else
            {
              /* Get the desired function.  */
              size_t namlen = (5 + strlen (ni->library->name) + 1
                               + strlen (fct_name) + 1);
              char name[namlen];
 
              /* Construct the function name.  */
              stpcpy (stpcpy (stpcpy (stpcpy (name, "_nss_"),
                                            ni->library->name),
                                  "_"),
                        fct_name);
 
              /* Look up the symbol.  */
              result = __libc_dlsym (ni->library->lib_handle, name);
            }
#else
          /* We can't get function address dynamically in static linking. */
          {
# define DEFINE_ENT(h,nm)                                                     \
            { #h"_get"#nm"ent_r", _nss_##h##_get##nm##ent_r },                \
            { #h"_end"#nm"ent", _nss_##h##_end##nm##ent },                    \
            { #h"_set"#nm"ent", _nss_##h##_set##nm##ent },
# define DEFINE_GET(h,nm)                                                     \
            { #h"_get"#nm"_r", _nss_##h##_get##nm##_r },
# define DEFINE_GETBY(h,nm,ky)                                                \
            { #h"_get"#nm"by"#ky"_r", _nss_##h##_get##nm##by##ky##_r },
            static struct fct_tbl { const char *fname; void *fp; } *tp, tbl[] =
              {
# include "function.def"
                { NULL, NULL }
              };
            size_t namlen = (5 + strlen (ni->library->name) + 1
                             + strlen (fct_name) + 1);
            char name[namlen];
 
            /* Construct the function name.  */
            stpcpy (stpcpy (stpcpy (name, ni->library->name),
                                "_"),
                      fct_name);
 
            result = NULL;
            for (tp = &tbl[0]; tp->fname; tp++)
              if (strcmp (tp->fname, name) == 0)
                {
                  result = tp->fp;
                  break;
                }
          }
#endif
 
          /* Remember function pointer for later calls.  Even if null, we
             record it so a second try needn't search the library again.  */
          known->fct_ptr = result;
        }
    }
 
  /* Remove the lock.  */
  __libc_lock_unlock (lock);
 
  return result;
}
libc_hidden_def (__nss_lookup_function)
 
 
static name_database *
internal_function
nss_parse_file (const char *fname)
{
  FILE *fp;
  name_database *result;
  name_database_entry *last;
  char *line;
  size_t len;
 
  /* Open the configuration file.  */
  fp = fopen (fname, "rc");
  if (fp == NULL)
    return NULL;
 
  /* No threads use this stream.  */
  __fsetlocking (fp, FSETLOCKING_BYCALLER);
 
  result = (name_database *) malloc (sizeof (name_database));
  if (result == NULL)
    return NULL;
 
  result->entry = NULL;
  result->library = NULL;
  last = NULL;
  line = NULL;
  len = 0;
  do
    {
      name_database_entry *this;
      ssize_t n;
      char *tmp;
 
      n = __getline (&line, &len, fp);
      if (n < 0)
        break;
      if (line[n - 1] == '\n')
        line[n - 1] = '\0';
 
      /* Because the file format does not know any form of quoting we
         can search forward for the next '#' character and if found
         make it terminating the line.  */
      tmp = strchr (line, '#');
      if (tmp == NULL)
        tmp = line + strlen (line);
      *tmp = '\0';
 
      /* If the line is blank it is ignored.  */
      if (line[0] == '\0')
        continue;
 
      /* Each line completely specifies the actions for a database.  */
      this = nss_getline (line);
      if (this != NULL)
        {
          if (last != NULL)
            last->next = this;
          else
            result->entry = this;
 
          last = this;
        }
    }
  while (!feof (fp));
 
  /* Free the buffer.  */
  free (line);
  /* Close configuration file.  */
  fclose (fp);
 
  return result;
}
 
 
/* Read the source names:
        `( <source> ( "[" "!"? (<status> "=" <action> )+ "]" )? )*'
   */
static service_user *
internal_function
nss_parse_service_list (const char *line)
{
  service_user *result = NULL, **nextp = &result;
 
  while (1)
    {
      service_user *new_service;
      const char *name;
 
      while (isspace (line[0]))
        ++line;
      if (line[0] == '\0')
        /* No source specified.  */
        return result;
 
      /* Read <source> identifier.  */
      name = line;
      while (line[0] != '\0' && !isspace (line[0]) && line[0] != '[')
        ++line;
      if (name == line)
        return result;
 
 
      new_service = (service_user *) malloc (sizeof (service_user)
                                             + (line - name + 1));
      if (new_service == NULL)
        return result;
 
      *((char *) mempcpy (new_service->name, name, line - name)) = '\0';
 
      /* Set default actions.  */
      new_service->actions[2 + NSS_STATUS_TRYAGAIN] = NSS_ACTION_CONTINUE;
      new_service->actions[2 + NSS_STATUS_UNAVAIL] = NSS_ACTION_CONTINUE;
      new_service->actions[2 + NSS_STATUS_NOTFOUND] = NSS_ACTION_CONTINUE;
      new_service->actions[2 + NSS_STATUS_SUCCESS] = NSS_ACTION_RETURN;
      new_service->actions[2 + NSS_STATUS_RETURN] = NSS_ACTION_RETURN;
      new_service->library = NULL;
      new_service->known = NULL;
      new_service->next = NULL;
 
      while (isspace (line[0]))
        ++line;
 
      if (line[0] == '[')
        {
          /* Read criterions.  */
          do
            ++line;
          while (line[0] != '\0' && isspace (line[0]));
 
          do
            {
              int not;
              enum nss_status status;
              lookup_actions action;
 
              /* Grok ! before name to mean all statii but that one.  */
              not = line[0] == '!';
              if (not)
                ++line;
 
              /* Read status name.  */
              name = line;
              while (line[0] != '\0' && !isspace (line[0]) && line[0] != '='
                     && line[0] != ']')
                ++line;
 
              /* Compare with known statii.  */
              if (line - name == 7)
                {
                  if (strncasecmp (name, "SUCCESS", 7) == 0)
                    status = NSS_STATUS_SUCCESS;
                  else if (strncasecmp (name, "UNAVAIL", 7) == 0)
                    status = NSS_STATUS_UNAVAIL;
                  else
                    return result;
                }
              else if (line - name == 8)
                {
                  if (strncasecmp (name, "NOTFOUND", 8) == 0)
                    status = NSS_STATUS_NOTFOUND;
                  else if (strncasecmp (name, "TRYAGAIN", 8) == 0)
                    status = NSS_STATUS_TRYAGAIN;
                  else
                    return result;
                }
              else
                return result;
 
              while (isspace (line[0]))
                ++line;
              if (line[0] != '=')
                return result;
              do
                ++line;
              while (isspace (line[0]));
 
              name = line;
              while (line[0] != '\0' && !isspace (line[0]) && line[0] != '='
                     && line[0] != ']')
                ++line;
 
              if (line - name == 6 && strncasecmp (name, "RETURN", 6) == 0)
                action = NSS_ACTION_RETURN;
              else if (line - name == 8
                       && strncasecmp (name, "CONTINUE", 8) == 0)
                action = NSS_ACTION_CONTINUE;
              else
                return result;
 
              if (not)
                {
                  /* Save the current action setting for this status,
                     set them all to the given action, and reset this one.  */
                  const lookup_actions save = new_service->actions[2 + status];
                  new_service->actions[2 + NSS_STATUS_TRYAGAIN] = action;
                  new_service->actions[2 + NSS_STATUS_UNAVAIL] = action;
                  new_service->actions[2 + NSS_STATUS_NOTFOUND] = action;
                  new_service->actions[2 + NSS_STATUS_SUCCESS] = action;
                  new_service->actions[2 + status] = save;
                }
              else
                new_service->actions[2 + status] = action;
 
              /* Skip white spaces.  */
              while (isspace (line[0]))
                ++line;
            }
          while (line[0] != ']');
 
          /* Skip the ']'.  */
          ++line;
        }
 
      *nextp = new_service;
      nextp = &new_service->next;
    }
}
 
static name_database_entry *
internal_function
nss_getline (char *line)
{
  const char *name;
  name_database_entry *result;
  size_t len;
 
  /* Ignore leading white spaces.  ATTENTION: this is different from
     what is implemented in Solaris.  The Solaris man page says a line
     beginning with a white space character is ignored.  We regard
     this as just another misfeature in Solaris.  */
  while (isspace (line[0]))
    ++line;
 
  /* Recognize `<database> ":"'.  */
  name = line;
  while (line[0] != '\0' && !isspace (line[0]) && line[0] != ':')
    ++line;
  if (line[0] == '\0' || name == line)
    /* Syntax error.  */
    return NULL;
  *line++ = '\0';
 
  len = strlen (name) + 1;
 
  result = (name_database_entry *) malloc (sizeof (name_database_entry) + len);
  if (result == NULL)
    return NULL;
 
  /* Save the database name.  */
  memcpy (result->name, name, len);
 
  /* Parse the list of services.  */
  result->service = nss_parse_service_list (line);
 
  result->next = NULL;
  return result;
}
 
 
static service_library *
internal_function
nss_new_service (name_database *database, const char *name)
{
  service_library **currentp = &database->library;
 
  while (*currentp != NULL)
    {
      if (strcmp ((*currentp)->name, name) == 0)
        return *currentp;
      currentp = &(*currentp)->next;
    }
 
  /* We have to add the new service.  */
  *currentp = (service_library *) malloc (sizeof (service_library));
  if (*currentp == NULL)
    return NULL;
 
  (*currentp)->name = name;
  (*currentp)->lib_handle = NULL;
  (*currentp)->next = NULL;
 
  return *currentp;
}
 
 
#ifdef USE_NSCD
/* Called by nscd and nscd alone.  */
void
__nss_disable_nscd (void)
{
  /* Disable all uses of NSCD.  */
  __nss_not_use_nscd_passwd = -1;
  __nss_not_use_nscd_group = -1;
  __nss_not_use_nscd_hosts = -1;
}
#endif
 
 
/* Free all resources if necessary.  */
libc_freeres_fn (free_mem)
{
  name_database *top = service_table;
  name_database_entry *entry;
  service_library *library;
 
  if (top == NULL)
    /* Maybe we have not read the nsswitch.conf file.  */
    return;
 
  /* Don't disturb ongoing other threads (if there are any).  */
  service_table = NULL;
 
  entry = top->entry;
  while (entry != NULL)
    {
      name_database_entry *olde = entry;
      service_user *service = entry->service;
 
      while (service != NULL)
        {
          service_user *olds = service;
 
          if (service->known != NULL)
            tdestroy (service->known, free);
 
          service = service->next;
          free (olds);
        }
 
      entry = entry->next;
      free (olde);
    }
 
  library = top->library;
  while (library != NULL)
    {
      service_library *oldl = library;
 
      if (library->lib_handle && library->lib_handle != (void *) -1l)
        __libc_dlclose (library->lib_handle);
 
      library = library->next;
      free (oldl);
    }
 
  free (top);
}
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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.18.0/] [newlib/] [libc/] [sys/] [linux/] [net/] [nsswitch.c] - Blame information for rev 207

Line No.	Rev	Author	Line
1	207	jeremybenn	`/* Copyright (C) 1996, 1997, 1998, 1999, 2001, 2002, 2003, 2004`
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			`#include "local.h"`
39
40			`#if !defined DO_STATIC_NSS \|\| defined SHARED`