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compat-spwd.c

/* Copyright (C) 1996,1997,1998,1999,2001,2002 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Thorsten Kukuk <kukuk@vt.uni-paderborn.de>, 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 <nss.h>
#include <errno.h>
#include <ctype.h>
#include <fcntl.h>
#include <netdb.h>
#include <shadow.h>
#include <string.h>
#include <bits/libc-lock.h>
#include <rpcsvc/yp.h>
#include <rpcsvc/ypclnt.h>
#include <rpcsvc/nis.h>
#include <nsswitch.h>

#include "netgroup.h"
#include "nss-nisplus.h"
#include "nisplus-parser.h"

static service_user *ni;
static bool_t use_nisplus; /* default: passwd_compat: nis */
static nis_name pwdtable; /* Name of the password table */
static size_t pwdtablelen;

/* Get the declaration of the parser function.  */
#define ENTNAME spent
#define STRUCTURE spwd
#define EXTERN_PARSER
#include <nss/nss_files/files-parse.c>

/* Structure for remembering -@netgroup and -user members ... */
#define BLACKLIST_INITIAL_SIZE 512
#define BLACKLIST_INCREMENT 256
struct blacklist_t
  {
    char *data;
    int current;
    int size;
  };

struct ent_t
  {
    bool_t netgroup;
    bool_t nis;
    bool_t first;
    char *oldkey;
    int oldkeylen;
    nis_result *result;
    FILE *stream;
    struct blacklist_t blacklist;
    struct spwd pwd;
    struct __netgrent netgrdata;
  };
typedef struct ent_t ent_t;

static ent_t ext_ent = {0, 0, 0, NULL, 0, NULL, NULL, {NULL, 0, 0},
                  {NULL, NULL, 0, 0, 0, 0, 0, 0, 0}};

/* Protect global state against multiple changers.  */
__libc_lock_define_initialized (static, lock)

/* Prototypes for local functions.  */
static void blacklist_store_name (const char *, ent_t *);
static int in_blacklist (const char *, int, ent_t *);

static void
give_spwd_free (struct spwd *pwd)
{
  if (pwd->sp_namp != NULL)
    free (pwd->sp_namp);
  if (pwd->sp_pwdp != NULL)
    free (pwd->sp_pwdp);

  memset (pwd, '\0', sizeof (struct spwd));
  pwd->sp_warn = -1;
  pwd->sp_inact = -1;
  pwd->sp_expire = -1;
  pwd->sp_flag = ~0ul;
}

static int
spwd_need_buflen (struct spwd *pwd)
{
  int len = 0;

  if (pwd->sp_pwdp != NULL)
    len += strlen (pwd->sp_pwdp) + 1;

  return len;
}

static void
copy_spwd_changes (struct spwd *dest, struct spwd *src,
               char *buffer, size_t buflen)
{
  if (src->sp_pwdp != NULL && strlen (src->sp_pwdp))
    {
      if (buffer == NULL)
      dest->sp_pwdp = strdup (src->sp_pwdp);
      else if (dest->sp_pwdp &&
             strlen (dest->sp_pwdp) >= strlen (src->sp_pwdp))
      strcpy (dest->sp_pwdp, src->sp_pwdp);
      else
      {
        dest->sp_pwdp = buffer;
        strcpy (dest->sp_pwdp, src->sp_pwdp);
        buffer += strlen (dest->sp_pwdp) + 1;
        buflen = buflen - (strlen (dest->sp_pwdp) + 1);
      }
    }
  if (src->sp_lstchg != 0)
    dest->sp_lstchg = src->sp_lstchg;
  if (src->sp_min != 0)
    dest->sp_min = src->sp_min;
  if (src->sp_max != 0)
    dest->sp_max = src->sp_max;
  if (src->sp_warn != -1)
    dest->sp_warn = src->sp_warn;
  if (src->sp_inact != -1)
    dest->sp_inact = src->sp_inact;
  if (src->sp_expire != -1)
    dest->sp_expire = src->sp_expire;
  if (src->sp_flag != ~0ul)
    dest->sp_flag = src->sp_flag;
}

static enum nss_status
internal_setspent (ent_t *ent)
{
  enum nss_status status = NSS_STATUS_SUCCESS;

  ent->nis = ent->first = ent->netgroup = 0;

  /* If something was left over free it.  */
  if (ent->netgroup)
    __internal_endnetgrent (&ent->netgrdata);

  if (ent->oldkey != NULL)
    {
      free (ent->oldkey);
      ent->oldkey = NULL;
      ent->oldkeylen = 0;
    }

  if (ent->result != NULL)
    {
      nis_freeresult (ent->result);
      ent->result = NULL;
    }

  if (pwdtable == NULL)
    {
      static const char key[] = "passwd.org_dir.";
      const char *local_dir = nis_local_directory ();
      size_t len_local_dir = strlen (local_dir);

      pwdtable = malloc (sizeof (key) + len_local_dir);
      if (pwdtable == NULL)
        return NSS_STATUS_TRYAGAIN;

      pwdtablelen = ((char *) mempcpy (mempcpy (pwdtable,
                                    key, sizeof (key) - 1),
                               local_dir, len_local_dir + 1)
                 - pwdtable) - 1;
    }

  if (ent->blacklist.data != NULL)
    {
      ent->blacklist.current = 1;
      ent->blacklist.data[0] = '|';
      ent->blacklist.data[1] = '\0';
    }
  else
    ent->blacklist.current = 0;

  if (ent->stream == NULL)
    {
      ent->stream = fopen ("/etc/shadow", "r");

      if (ent->stream == NULL)
      status = errno == EAGAIN ? NSS_STATUS_TRYAGAIN : NSS_STATUS_UNAVAIL;
      else
      {
        /* We have to make sure the file is  `closed on exec'.  */
        int result, flags;

        result = flags = fcntl (fileno (ent->stream), F_GETFD, 0);
        if (result >= 0)
          {
            flags |= FD_CLOEXEC;
            result = fcntl (fileno (ent->stream), F_SETFD, flags);
          }
        if (result < 0)
          {
            /* Something went wrong.  Close the stream and return a
             failure.  */
            fclose (ent->stream);
            ent->stream = NULL;
            status = NSS_STATUS_UNAVAIL;
          }
      }
    }
  else
    rewind (ent->stream);

  give_spwd_free (&ent->pwd);

  return status;
}


enum nss_status
_nss_compat_setspent (int stayopen)
{
  enum nss_status result;

  __libc_lock_lock (lock);

  if (ni == NULL)
    {
      __nss_database_lookup ("shadow_compat", "passwd_compat", "nis", &ni);
      use_nisplus = (strcmp (ni->name, "nisplus") == 0);
    }

  result = internal_setspent (&ext_ent);

  __libc_lock_unlock (lock);

  return result;
}


static enum nss_status
internal_endspent (ent_t *ent)
{
  if (ent->stream != NULL)
    {
      fclose (ent->stream);
      ent->stream = NULL;
    }

  if (ent->netgroup)
    __internal_endnetgrent (&ent->netgrdata);

  ent->nis = ent->first = ent->netgroup = 0;

  if (ent->oldkey != NULL)
    {
      free (ent->oldkey);
      ent->oldkey = NULL;
      ent->oldkeylen = 0;
    }

  if (ent->result != NULL)
    {
      nis_freeresult (ent->result);
      ent->result = NULL;
    }

  if (ent->blacklist.data != NULL)
    {
      ent->blacklist.current = 1;
      ent->blacklist.data[0] = '|';
      ent->blacklist.data[1] = '\0';
    }
  else
    ent->blacklist.current = 0;

  give_spwd_free (&ent->pwd);

  return NSS_STATUS_SUCCESS;
}

enum nss_status
_nss_compat_endspent (void)
{
  enum nss_status result;

  __libc_lock_lock (lock);

  result = internal_endspent (&ext_ent);

  __libc_lock_unlock (lock);

  return result;
}


static enum nss_status
getspent_next_nis_netgr (const char *name, struct spwd *result, ent_t *ent,
                   char *group, char *buffer, size_t buflen, int *errnop)
{
  struct parser_data *data = (void *) buffer;
  char *ypdomain, *host, *user, *domain, *outval, *p, *p2;
  int status, outvallen;
  size_t p2len;

  if (yp_get_default_domain (&ypdomain) != YPERR_SUCCESS)
    {
      ent->netgroup = 0;
      ent->first = 0;
      give_spwd_free (&ent->pwd);
      return NSS_STATUS_UNAVAIL;
    }

  if (ent->first == TRUE)
    {
      bzero (&ent->netgrdata, sizeof (struct __netgrent));
      __internal_setnetgrent (group, &ent->netgrdata);
      ent->first = FALSE;
    }

  while (1)
    {
      char *saved_cursor;
      int parse_res;

      saved_cursor = ent->netgrdata.cursor;
      status = __internal_getnetgrent_r (&host, &user, &domain,
                               &ent->netgrdata, buffer, buflen,
                               errnop);
      if (status != 1)
      {
        __internal_endnetgrent (&ent->netgrdata);
        ent->netgroup = 0;
        give_spwd_free (&ent->pwd);
        return NSS_STATUS_RETURN;
      }

      if (user == NULL || user[0] == '-')
      continue;

      if (domain != NULL && strcmp (ypdomain, domain) != 0)
      continue;

      /* If name != NULL, we are called from getpwnam */
      if (name != NULL)
      if (strcmp (user, name) != 0)
        continue;

      if (yp_match (ypdomain, "shadow.byname", user,
                strlen (user), &outval, &outvallen)
        != YPERR_SUCCESS)
      continue;

      p2len = spwd_need_buflen (&ent->pwd);
      if (p2len > buflen)
      {
        free (outval);
        *errnop = ERANGE;
        return NSS_STATUS_TRYAGAIN;
      }
      p2 = buffer + (buflen - p2len);
      buflen -= p2len;
      if (buflen < ((size_t) outval + 1))
      {
        free (outval);
        *errnop = ERANGE;
        return NSS_STATUS_TRYAGAIN;
      }
      p = strncpy (buffer, outval, buflen);
      while (isspace (*p))
      p++;
      free (outval);
      parse_res = _nss_files_parse_spent (p, result, data, buflen, errnop);
      if (parse_res == -1)
      {
        ent->netgrdata.cursor = saved_cursor;
        *errnop = ERANGE;
        return NSS_STATUS_TRYAGAIN;
      }

      if (parse_res)
      {
        /* Store the User in the blacklist for the "+" at the end of
           /etc/passwd */
        blacklist_store_name (result->sp_namp, ent);
        copy_spwd_changes (result, &ent->pwd, p2, p2len);
        break;
      }
    }

  return NSS_STATUS_SUCCESS;
}

static enum nss_status
getspent_next_nisplus_netgr (const char *name, struct spwd *result,
                       ent_t *ent, char *group, char *buffer,
                       size_t buflen, int *errnop)
{
  char *ypdomain, *host, *user, *domain, *p2;
  int status, parse_res;
  size_t p2len;
  nis_result *nisres;

  /* Maybe we should use domainname here ? We need the current
     domainname for the domain field in netgroups */
  if (yp_get_default_domain (&ypdomain) != YPERR_SUCCESS)
    {
      ent->netgroup = 0;
      ent->first = 0;
      give_spwd_free (&ent->pwd);
      return NSS_STATUS_UNAVAIL;
    }

  if (ent->first == TRUE)
    {
      bzero (&ent->netgrdata, sizeof (struct __netgrent));
      __internal_setnetgrent (group, &ent->netgrdata);
      ent->first = FALSE;
    }

  while (1)
    {
      char *saved_cursor;

      saved_cursor = ent->netgrdata.cursor;
      status = __internal_getnetgrent_r (&host, &user, &domain,
                                         &ent->netgrdata, buffer, buflen,
                               errnop);
      if (status != 1)
        {
          __internal_endnetgrent (&ent->netgrdata);
          ent->netgroup = 0;
          give_spwd_free (&ent->pwd);
          return NSS_STATUS_RETURN;
        }

      if (user == NULL || user[0] == '-')
        continue;

      if (domain != NULL && strcmp (ypdomain, domain) != 0)
        continue;

      /* If name != NULL, we are called from getpwnam */
      if (name != NULL)
      if (strcmp (user, name) != 0)
        continue;

      p2len = spwd_need_buflen (&ent->pwd);
      if (p2len > buflen)
        {
          *errnop = ERANGE;
          return NSS_STATUS_TRYAGAIN;
        }
      p2 = buffer + (buflen - p2len);
      buflen -= p2len;
      {
        char buf[strlen (user) + 30 + pwdtablelen];
        sprintf (buf, "[name=%s],%s", user, pwdtable);
        nisres = nis_list (buf, FOLLOW_LINKS | FOLLOW_PATH, NULL, NULL);
      }
      if (niserr2nss (nisres->status) != NSS_STATUS_SUCCESS)
        {
          nis_freeresult (nisres);
          continue;
        }
      parse_res = _nss_nisplus_parse_spent (nisres, result, buffer,
                                  buflen, errnop);
      if (parse_res == -1)
      {
        nis_freeresult (nisres);
        *errnop = ERANGE;
        return NSS_STATUS_TRYAGAIN;
      }
      nis_freeresult (nisres);

      if (parse_res)
        {
        /* Store the User in the blacklist for the "+" at the end of
           /etc/passwd */
        blacklist_store_name (result->sp_namp, ent);
        copy_spwd_changes (result, &ent->pwd, p2, p2len);
          break;
        }
    }

  return NSS_STATUS_SUCCESS;
}

static enum nss_status
getspent_next_nisplus (struct spwd *result, ent_t *ent, char *buffer,
                       size_t buflen, int *errnop)
{
  int parse_res;
  size_t p2len;
  char *p2;

  p2len = spwd_need_buflen (&ent->pwd);
  if (p2len > buflen)
    {
      *errnop = ERANGE;
      return NSS_STATUS_TRYAGAIN;
    }
  p2 = buffer + (buflen - p2len);
  buflen -= p2len;
  do
    {
      bool_t saved_first;
      nis_result *saved_res;

      if (ent->first)
        {
        saved_first = TRUE;
        saved_res = ent->result;

          ent->result = nis_first_entry (pwdtable);
          if (niserr2nss (ent->result->status) != NSS_STATUS_SUCCESS)
            {
              ent->nis = 0;
              give_spwd_free (&ent->pwd);
              return niserr2nss (ent->result->status);
            }
          ent->first = FALSE;
        }
      else
        {
          nis_result *res;

        saved_first = FALSE;
        saved_res = ent->result;

          res = nis_next_entry (pwdtable, &ent->result->cookie);
          ent->result = res;
          if (niserr2nss (ent->result->status) != NSS_STATUS_SUCCESS)
            {
            nis_freeresult (saved_res);
            ent->nis = 0;
            give_spwd_free (&ent->pwd);
            return niserr2nss (ent->result->status);
            }
        }
      parse_res = _nss_nisplus_parse_spent (ent->result, result, buffer,
                                  buflen, errnop);
      if (parse_res == -1)
      {
        ent->first = saved_first;
        nis_freeresult (ent->result);
        ent->result = saved_res;
        *errnop = ERANGE;
        return NSS_STATUS_TRYAGAIN;
      }
      else
      {
        if (!saved_first)
          nis_freeresult (saved_res);
      }
      if (parse_res &&
          in_blacklist (result->sp_namp, strlen (result->sp_namp), ent))
        parse_res = 0; /* if result->pw_name in blacklist,search next entry */
    }
  while (!parse_res);

  copy_spwd_changes (result, &ent->pwd, p2, p2len);

  return NSS_STATUS_SUCCESS;
}


static enum nss_status
getspent_next_nis (struct spwd *result, ent_t *ent,
               char *buffer, size_t buflen, int *errnop)
{
  struct parser_data *data = (void *) buffer;
  char *domain, *outkey, *outval, *p, *p2;
  int outkeylen, outvallen, parse_res;
  size_t p2len;

  if (yp_get_default_domain (&domain) != YPERR_SUCCESS)
    {
      ent->nis = 0;
      give_spwd_free (&ent->pwd);
      return NSS_STATUS_UNAVAIL;
    }

  p2len = spwd_need_buflen (&ent->pwd);
  if (p2len > buflen)
    {
      *errnop = ERANGE;
      return NSS_STATUS_TRYAGAIN;
    }
  p2 = buffer + (buflen - p2len);
  buflen -= p2len;
  do
    {
      bool_t saved_first;
      char *saved_oldkey;
      int saved_oldlen;

      if (ent->first)
      {
        if (yp_first (domain, "shadow.byname", &outkey, &outkeylen,
                  &outval, &outvallen) != YPERR_SUCCESS)
          {
            ent->nis = 0;
            give_spwd_free (&ent->pwd);
            return NSS_STATUS_UNAVAIL;
          }

        if (buflen < ((size_t) outvallen + 1))
          {
            free (outval);
            *errnop = ERANGE;
            return NSS_STATUS_TRYAGAIN;
          }

        saved_first = TRUE;
        saved_oldkey = ent->oldkey;
        saved_oldlen = ent->oldkeylen;
        ent->oldkey = outkey;
        ent->oldkeylen = outkeylen;
        ent->first = FALSE;
      }
      else
      {
        if (yp_next (domain, "shadow.byname", ent->oldkey, ent->oldkeylen,
                   &outkey, &outkeylen, &outval, &outvallen)
            != YPERR_SUCCESS)
          {
            ent->nis = 0;
            give_spwd_free (&ent->pwd);
            return NSS_STATUS_NOTFOUND;
          }

        if (buflen < ((size_t) outvallen + 1))
          {
            free (outval);
            *errnop = ERANGE;
            return NSS_STATUS_TRYAGAIN;
          }

        saved_first = FALSE;
        saved_oldkey = ent->oldkey;
        saved_oldlen = ent->oldkeylen;
        ent->oldkey = outkey;
        ent->oldkeylen = outkeylen;
      }

      /* Copy the found data to our buffer  */
      p = strncpy (buffer, outval, buflen);

      /* ...and free the data.  */
      free (outval);

      while (isspace (*p))
      ++p;
      parse_res = _nss_files_parse_spent (p, result, data, buflen, errnop);
      if (parse_res == -1)
      {
        free (ent->oldkey);
        ent->oldkey = saved_oldkey;
        ent->oldkeylen = saved_oldlen;
        ent->first = saved_first;
        *errnop = ERANGE;
        return NSS_STATUS_TRYAGAIN;
      }
      else
      {
        if (!saved_first)
          free (saved_oldkey);
      }
      if (parse_res &&
          in_blacklist (result->sp_namp, strlen (result->sp_namp), ent))
        parse_res = 0;
    }
  while (!parse_res);

  copy_spwd_changes (result, &ent->pwd, p2, p2len);

  return NSS_STATUS_SUCCESS;
}

/* This function handle the +user entrys in /etc/shadow */
static enum nss_status
getspnam_plususer (const char *name, struct spwd *result, char *buffer,
               size_t buflen, int *errnop)
{
  struct parser_data *data = (void *) buffer;
  struct spwd pwd;
  int parse_res;
  char *p;
  size_t plen;

  memset (&pwd, '\0', sizeof (struct spwd));
  pwd.sp_warn = -1;
  pwd.sp_inact = -1;
  pwd.sp_expire = -1;
  pwd.sp_flag = ~0ul;

  copy_spwd_changes (&pwd, result, NULL, 0);

  plen = spwd_need_buflen (&pwd);
  if (plen > buflen)
    {
      *errnop = ERANGE;
      return NSS_STATUS_TRYAGAIN;
    }
  p = buffer + (buflen - plen);
  buflen -= plen;

  if (use_nisplus) /* Do the NIS+ query here */
    {
      nis_result *res;
      char buf[strlen (name) + 24 + pwdtablelen];

      sprintf(buf, "[name=%s],%s", name, pwdtable);
      res = nis_list(buf, 0, NULL, NULL);
      if (niserr2nss (res->status) != NSS_STATUS_SUCCESS)
        {
          enum nss_status status =  niserr2nss (res->status);

          nis_freeresult (res);
          return status;
        }
      parse_res = _nss_nisplus_parse_spent (res, result, buffer,
                                  buflen, errnop);
      if (parse_res == -1)
      {
        nis_freeresult (res);
        *errnop = ERANGE;
        return NSS_STATUS_TRYAGAIN;
      }
      nis_freeresult (res);
    }
  else /* Use NIS */
    {
      char *domain, *outval, *ptr;
      int outvallen;

      if (yp_get_default_domain (&domain) != YPERR_SUCCESS)
      return NSS_STATUS_NOTFOUND;

      if (yp_match (domain, "shadow.byname", name, strlen (name),
                &outval, &outvallen)  != YPERR_SUCCESS)
      return NSS_STATUS_NOTFOUND;

      if (buflen < ((size_t) outvallen + 1))
      {
        free (outval);
        *errnop = ERANGE;
        return NSS_STATUS_TRYAGAIN;
      }

      ptr = strncpy (buffer, outval, buflen);
      free (outval);
      while (isspace (*ptr))
        ptr++;
      parse_res = _nss_files_parse_spent (ptr, result, data, buflen, errnop);
      if (parse_res == -1)
      return NSS_STATUS_TRYAGAIN;
    }

  if (parse_res)
    {
      copy_spwd_changes (result, &pwd, p, plen);
      give_spwd_free (&pwd);
      /* We found the entry.  */
      return NSS_STATUS_SUCCESS;
    }
  else
    {
      /* Give buffer the old len back */
      buflen += plen;
      give_spwd_free (&pwd);
    }
  return NSS_STATUS_RETURN;
}

static enum nss_status
getspent_next_file (struct spwd *result, ent_t *ent,
                char *buffer, size_t buflen, int *errnop)
{
  struct parser_data *data = (void *) buffer;
  while (1)
    {
      fpos_t pos;
      int parse_res = 0;
      char *p;

      do
      {
        fgetpos (ent->stream, &pos);
        buffer[buflen - 1] = '\xff';
        p = fgets (buffer, buflen, ent->stream);
        if (p == NULL && feof (ent->stream))
          return NSS_STATUS_NOTFOUND;

        if (p == NULL || buffer[buflen - 1] != '\xff')
          {
            fsetpos (ent->stream, &pos);
            *errnop = ERANGE;
            return NSS_STATUS_TRYAGAIN;
          }

        /* Skip leading blanks.  */
        while (isspace (*p))
          ++p;
      }
      while (*p == '\0' || *p == '#'      /* Ignore empty and comment lines.  */
      /* Parse the line.  If it is invalid, loop to
         get the next line of the file to parse.  */
           || !(parse_res = _nss_files_parse_spent (p, result, data,
                                          buflen, errnop)));

      if (parse_res == -1)
        {
          /* The parser ran out of space.  */
          fsetpos (ent->stream, &pos);
          *errnop = ERANGE;
          return NSS_STATUS_TRYAGAIN;
        }

      if (result->sp_namp[0] != '+' && result->sp_namp[0] != '-')
      /* This is a real entry.  */
      break;

      /* -@netgroup */
      if (result->sp_namp[0] == '-' && result->sp_namp[1] == '@'
        && result->sp_namp[2] != '\0')
      {
        /* XXX Do not use fixed length buffers.  */
          char buf2[1024];
        char *user, *host, *domain;
          struct __netgrent netgrdata;

          bzero (&netgrdata, sizeof (struct __netgrent));
          __internal_setnetgrent (&result->sp_namp[2], &netgrdata);
        while (__internal_getnetgrent_r (&host, &user, &domain,
                                 &netgrdata, buf2, sizeof (buf2),
                                 errnop))
          {
            if (user != NULL && user[0] != '-')
            blacklist_store_name (user, ent);
          }
        __internal_endnetgrent (&netgrdata);
        continue;
      }

      /* +@netgroup */
      if (result->sp_namp[0] == '+' && result->sp_namp[1] == '@'
        && result->sp_namp[2] != '\0')
      {
        int status;

        ent->netgroup = TRUE;
        ent->first = TRUE;
        copy_spwd_changes (&ent->pwd, result, NULL, 0);

        if (use_nisplus)
          status = getspent_next_nisplus_netgr (NULL, result, ent,
                                      &result->sp_namp[2],
                                      buffer, buflen, errnop);
        else
          status = getspent_next_nis_netgr (NULL, result, ent,
                                    &result->sp_namp[2],
                                    buffer, buflen, errnop);
        if (status == NSS_STATUS_RETURN)
          continue;
        else
          return status;
      }

      /* -user */
      if (result->sp_namp[0] == '-' && result->sp_namp[1] != '\0'
        && result->sp_namp[1] != '@')
      {
        blacklist_store_name (&result->sp_namp[1], ent);
        continue;
      }

      /* +user */
      if (result->sp_namp[0] == '+' && result->sp_namp[1] != '\0'
        && result->sp_namp[1] != '@')
      {
          enum nss_status status;

        /* Store the User in the blacklist for the "+" at the end of
           /etc/passwd */
        blacklist_store_name (&result->sp_namp[1], ent);
          status = getspnam_plususer (&result->sp_namp[1], result, buffer,
                              buflen, errnop);
          if (status == NSS_STATUS_SUCCESS) /* We found the entry. */
            break;
          else
            if (status == NSS_STATUS_RETURN /* We couldn't parse the entry */
            || status == NSS_STATUS_NOTFOUND) /* entry doesn't exist */
              continue;
            else
            {
            if (status == NSS_STATUS_TRYAGAIN)
              {
                fsetpos (ent->stream, &pos);
                *errnop = ERANGE;
              }
            return status;
            }
      }

      /* +:... */
      if (result->sp_namp[0] == '+' && result->sp_namp[1] == '\0')
      {
        ent->nis = TRUE;
        ent->first = TRUE;
        copy_spwd_changes (&ent->pwd, result, NULL, 0);

        if (use_nisplus)
          return getspent_next_nisplus (result, ent, buffer, buflen, errnop);
        else
          return getspent_next_nis (result, ent, buffer, buflen, errnop);
      }
    }

  return NSS_STATUS_SUCCESS;
}


static enum nss_status
internal_getspent_r (struct spwd *pw, ent_t *ent,
                 char *buffer, size_t buflen, int *errnop)
{
  if (ent->netgroup)
    {
      int status;

      /* We are searching members in a netgroup */
      /* Since this is not the first call, we don't need the group name */
      if (use_nisplus)
      status = getspent_next_nisplus_netgr (NULL, pw, ent, NULL, buffer,
                                    buflen, errnop);
      else
      status = getspent_next_nis_netgr (NULL, pw, ent, NULL, buffer, buflen,
                                errnop);
      if (status == NSS_STATUS_RETURN)
      return getspent_next_file (pw, ent, buffer, buflen, errnop);
      else
      return status;
    }
  else
    if (ent->nis)
      {
      if (use_nisplus)
        return getspent_next_nisplus (pw, ent, buffer, buflen, errnop);
      else
        return getspent_next_nis (pw, ent, buffer, buflen, errnop);
      }
    else
      return getspent_next_file (pw, ent, buffer, buflen, errnop);
}

enum nss_status
_nss_compat_getspent_r (struct spwd *pwd, char *buffer, size_t buflen,
                  int *errnop)
{
  enum nss_status status = NSS_STATUS_SUCCESS;

  __libc_lock_lock (lock);

  if (ni == NULL)
    {
      __nss_database_lookup ("shadow_compat", "passwd_compat", "nis", &ni);
      use_nisplus = (strcmp (ni->name, "nisplus") == 0);
    }

  /* Be prepared that the setspent function was not called before.  */
  if (ext_ent.stream == NULL)
    status = internal_setspent (&ext_ent);

  if (status == NSS_STATUS_SUCCESS)
    status = internal_getspent_r (pwd, &ext_ent, buffer, buflen, errnop);

  __libc_lock_unlock (lock);

  return status;
}

/* Searches in /etc/passwd and the NIS/NIS+ map for a special user */
static enum nss_status
internal_getspnam_r (const char *name, struct spwd *result, ent_t *ent,
                 char *buffer, size_t buflen, int *errnop)
{
  struct parser_data *data = (void *) buffer;

  while (1)
    {
      fpos_t pos;
      char *p;
      int parse_res;

      do
      {
        fgetpos (ent->stream, &pos);
        buffer[buflen - 1] = '\xff';
        p = fgets (buffer, buflen, ent->stream);
        if (p == NULL && feof (ent->stream))
          return NSS_STATUS_NOTFOUND;

        if (p == NULL || buffer[buflen - 1] != '\xff')
          {
            fsetpos (ent->stream, &pos);
            *errnop = ERANGE;
            return NSS_STATUS_TRYAGAIN;
          }

        /* Skip leading blanks.  */
        while (isspace (*p))
          ++p;
      }
      while (*p == '\0' || *p == '#' || /* Ignore empty and comment lines.  */
           /* Parse the line.  If it is invalid, loop to
            get the next line of the file to parse.  */
           !(parse_res = _nss_files_parse_spent (p, result, data, buflen,
                                       errnop)));

      if (parse_res == -1)
      {
        /* The parser ran out of space.  */
        fsetpos (ent->stream, &pos);
        *errnop = ERANGE;
        return NSS_STATUS_TRYAGAIN;
      }

      /* This is a real entry.  */
      if (result->sp_namp[0] != '+' && result->sp_namp[0] != '-')
      {
        if (strcmp (result->sp_namp, name) == 0)
          return NSS_STATUS_SUCCESS;
        else
          continue;
      }

      /* -@netgroup */
      if (result->sp_namp[0] == '-' && result->sp_namp[1] == '@'
        && result->sp_namp[2] != '\0')
      {
        /* XXX Do not use fixed length buffers.  */
        char buf2[1024];
        char *user, *host, *domain;
        struct __netgrent netgrdata;

        bzero (&netgrdata, sizeof (struct __netgrent));
        __internal_setnetgrent (&result->sp_namp[2], &netgrdata);
        while (__internal_getnetgrent_r (&host, &user, &domain, &netgrdata,
                                 buf2, sizeof (buf2), errnop))
          {
            if (user != NULL && user[0] != '-')
            if (strcmp (user, name) == 0)
              return NSS_STATUS_NOTFOUND;
          }
        __internal_endnetgrent (&netgrdata);
        continue;
      }

      /* +@netgroup */
      if (result->sp_namp[0] == '+' && result->sp_namp[1] == '@'
        && result->sp_namp[2] != '\0')
      {
        char *buf = strdupa (&result->sp_namp[2]);
        int status;

        ent->netgroup = TRUE;
        ent->first = TRUE;
        copy_spwd_changes (&ent->pwd, result, NULL, 0);

        do
          {
            if (use_nisplus)
            status = getspent_next_nisplus_netgr (name, result, ent, buf,
                                          buffer, buflen, errnop);
            else
            status = getspent_next_nis_netgr (name, result, ent, buf,
                                      buffer, buflen, errnop);
            if (status == NSS_STATUS_RETURN)
            continue;

            if (status == NSS_STATUS_SUCCESS
              && strcmp (result->sp_namp, name) == 0)
            return NSS_STATUS_SUCCESS;
          } while (status == NSS_STATUS_SUCCESS);
        continue;
      }

      /* -user */
      if (result->sp_namp[0] == '-' && result->sp_namp[1] != '\0'
        && result->sp_namp[1] != '@')
      {
        if (strcmp (&result->sp_namp[1], name) == 0)
          return NSS_STATUS_NOTFOUND;
        else
          continue;
      }

      /* +user */
      if (result->sp_namp[0] == '+' && result->sp_namp[1] != '\0'
        && result->sp_namp[1] != '@')
      {
        if (strcmp (name, &result->sp_namp[1]) == 0)
          {
            enum nss_status status;

            status = getspnam_plususer (name, result, buffer, buflen,
                                errnop);
            if (status == NSS_STATUS_RETURN)
            /* We couldn't parse the entry */
            return NSS_STATUS_NOTFOUND;
            else
            return status;
          }
      }

      /* +:... */
      if (result->sp_namp[0] == '+' && result->sp_namp[1] == '\0')
      {
        enum nss_status status;

        status = getspnam_plususer (name, result, buffer, buflen, errnop);
        if (status == NSS_STATUS_RETURN) /* We couldn't parse the entry */
          return NSS_STATUS_NOTFOUND;
        else
          return status;
      }
    }
  return NSS_STATUS_SUCCESS;
}

enum nss_status
_nss_compat_getspnam_r (const char *name, struct spwd *pwd,
                  char *buffer, size_t buflen, int *errnop)
{
  ent_t ent = {0, 0, 0, NULL, 0, NULL, NULL, {NULL, 0, 0},
             {NULL, NULL, 0, 0, 0, 0, 0, 0, 0}};
  enum nss_status status;

  if (name[0] == '-' || name[0] == '+')
    return NSS_STATUS_NOTFOUND;

  if (ni == NULL)
    {
      __nss_database_lookup ("shadow_compat", "passwd_compat", "nis", &ni);
      use_nisplus = (strcmp (ni->name, "nisplus") == 0);
    }

  status = internal_setspent (&ent);
  if (status != NSS_STATUS_SUCCESS)
    return status;

  status = internal_getspnam_r (name, pwd, &ent, buffer, buflen, errnop);

  internal_endspent (&ent);

  return status;
}

/* Support routines for remembering -@netgroup and -user entries.
   The names are stored in a single string with `|' as separator. */
static void
blacklist_store_name (const char *name, ent_t *ent)
{
  int namelen = strlen (name);
  char *tmp;

  /* first call, setup cache */
  if (ent->blacklist.size == 0)
    {
      ent->blacklist.size = MAX (BLACKLIST_INITIAL_SIZE, 2 * namelen);
      ent->blacklist.data = malloc (ent->blacklist.size);
      if (ent->blacklist.data == NULL)
      return;
      ent->blacklist.data[0] = '|';
      ent->blacklist.data[1] = '\0';
      ent->blacklist.current = 1;
    }
  else
    {
      if (in_blacklist (name, namelen, ent))
      return;                 /* no duplicates */

      if (ent->blacklist.current + namelen + 1 >= ent->blacklist.size)
      {
        ent->blacklist.size += MAX (BLACKLIST_INCREMENT, 2 * namelen);
        tmp = realloc (ent->blacklist.data, ent->blacklist.size);
        if (tmp == NULL)
          {
            free (ent->blacklist.data);
            ent->blacklist.size = 0;
            return;
          }
        ent->blacklist.data = tmp;
      }
    }

  tmp = stpcpy (ent->blacklist.data + ent->blacklist.current, name);
  *tmp++ = '|';
  *tmp = '\0';
  ent->blacklist.current += namelen + 1;

  return;
}

/* Returns TRUE if ent->blacklist contains name, else FALSE.  */
static bool_t
in_blacklist (const char *name, int namelen, ent_t *ent)
{
  char buf[namelen + 3];
  char *cp;

  if (ent->blacklist.data == NULL)
    return FALSE;

  buf[0] = '|';
  cp = stpcpy (&buf[1], name);
  *cp++= '|';
  *cp = '\0';
  return strstr (ent->blacklist.data, buf) != NULL;
}

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