text: /* Copyright (C) 1996-2016 Free Software Foundation, Inc.
     This file is part of the GNU C Library.
     Contributed by Thorsten Kukuk <kukuk@suse.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, see
     <http://www.gnu.org/licenses/>.  */
  
  #include <ctype.h>
  #include <errno.h>
  #include <grp.h>
  #include <nss.h>
  #include <string.h>
  #include <libc-lock.h>
  #include <rpcsvc/yp.h>
  #include <rpcsvc/ypclnt.h>
  
  #include "nss-nis.h"
  #include <libnsl.h>
  
  /* Get the declaration of the parser function.  */
  #define ENTNAME grent
  #define STRUCTURE group
  #define EXTERN_PARSER
  #include <nss/nss_files/files-parse.c>
  
  /* Protect global state against multiple changers */
  __libc_lock_define_initialized (static, lock)
  
  static bool_t new_start = 1;
  static char *oldkey;
  static int oldkeylen;
  static intern_t intern;
  
  
  static void
  internal_nis_endgrent (void)
  {
    new_start = 1;
    if (oldkey != NULL)
      {
        free (oldkey);
        oldkey = NULL;
        oldkeylen = 0;
      }
  
    struct response_t *curr = intern.start;
  
    while (curr != NULL)
      {
        struct response_t *last = curr;
        curr = curr->next;
        free (last);
      }
  
    intern.next = intern.start = NULL;
  }
  
  
  enum nss_status
  _nss_nis_endgrent (void)
  {
    __libc_lock_lock (lock);
  
    internal_nis_endgrent ();
  
    __libc_lock_unlock (lock);
  
    return NSS_STATUS_SUCCESS;
  }
  
  
  enum nss_status
  internal_nis_setgrent (void)
  {
    /* We have to read all the data now.  */
    char *domain;
    if (__glibc_unlikely (yp_get_default_domain (&domain)))
      return NSS_STATUS_UNAVAIL;
  
    struct ypall_callback ypcb;
  
    ypcb.foreach = _nis_saveit;
    ypcb.data = (char *) &intern;
    enum nss_status status = yperr2nss (yp_all (domain, "group.byname", &ypcb));
  
  
    /* Mark the last buffer as full.  */
    if (intern.next != NULL)
      intern.next->size = intern.offset;
  
    intern.next = intern.start;
    intern.offset = 0;
  
    return status;
  }
  
  
  enum nss_status
  _nss_nis_setgrent (int stayopen)
  {
    enum nss_status result = NSS_STATUS_SUCCESS;
  
    __libc_lock_lock (lock);
  
    internal_nis_endgrent ();
  
    if (_nsl_default_nss () & NSS_FLAG_SETENT_BATCH_READ)
      result = internal_nis_setgrent ();
  
    __libc_lock_unlock (lock);
  
    return result;
  }
  
  
  static enum nss_status
  internal_nis_getgrent_r (struct group *grp, char *buffer, size_t buflen,
  			 int *errnop)
  {
    /* If we read the entire database at setpwent time we just iterate
       over the data we have in memory.  */
    bool batch_read = intern.start != NULL;
  
    char *domain = NULL;
    if (!batch_read && __builtin_expect (yp_get_default_domain (&domain), 0))
      return NSS_STATUS_UNAVAIL;
  
    /* Get the next entry until we found a correct one. */
    int parse_res;
    do
      {
        char *result;
        char *outkey;
        int len;
        int keylen;
  
        if (batch_read)
  	{
  	  struct response_t *bucket;
  
  	handle_batch_read:
  	  bucket = intern.next;
  
  	  if (__glibc_unlikely (intern.offset >= bucket->size))
  	    {
  	      if (bucket->next == NULL)
  		return NSS_STATUS_NOTFOUND;
  
  	      /* We look at all the content in the current bucket.  Go on
  		 to the next.  */
  	      bucket = intern.next = bucket->next;
  	      intern.offset = 0;
  	    }
  
  	  for (result = &bucket->mem[intern.offset]; isspace (*result);
  	       ++result)
  	    ++intern.offset;
  
  	  len = strlen (result);
  	}
        else
  	{
  	  int yperr;
  
  	  if (new_start)
  	    {
  	      /* Maybe we should read the database in one piece.  */
  	      if ((_nsl_default_nss () & NSS_FLAG_SETENT_BATCH_READ)
  		  && internal_nis_setgrent () == NSS_STATUS_SUCCESS
  		  && intern.start != NULL)
  		{
  		  batch_read = true;
  		  goto handle_batch_read;
  		}
  
  	      yperr = yp_first (domain, "group.byname", &outkey, &keylen,
  				&result, &len);
  	    }
  	  else
  	    yperr = yp_next (domain, "group.byname", oldkey, oldkeylen,
  			     &outkey, &keylen, &result, &len);
  
  	  if (__glibc_unlikely (yperr != YPERR_SUCCESS))
  	    {
  	      enum nss_status retval = yperr2nss (yperr);
  
  	      if (retval == NSS_STATUS_TRYAGAIN)
  		*errnop = errno;
  	      return retval;
  	    }
  	}
  
        if (__glibc_unlikely ((size_t) (len + 1) > buflen))
  	{
  	  if (!batch_read)
  	    free (result);
  	  *errnop = ERANGE;
  	  return NSS_STATUS_TRYAGAIN;
  	}
  
        char *p = strncpy (buffer, result, len);
        buffer[len] = '\0';
        while (isspace (*p))
  	++p;
        if (!batch_read)
  	free (result);
  
        parse_res = _nss_files_parse_grent (p, grp, (void *) buffer, buflen,
  					  errnop);
        if (__glibc_unlikely (parse_res == -1))
  	{
  	  if (!batch_read)
  	    free (outkey);
  	  *errnop = ERANGE;
  	  return NSS_STATUS_TRYAGAIN;
  	}
  
        if (batch_read)
  	intern.offset += len + 1;
        else
  	{
  	  free (oldkey);
  	  oldkey = outkey;
  	  oldkeylen = keylen;
  	  new_start = 0;
  	}
      }
    while (parse_res < 1);
  
    return NSS_STATUS_SUCCESS;
  }
  
  enum nss_status
  _nss_nis_getgrent_r (struct group *result, char *buffer, size_t buflen,
  		     int *errnop)
  {
    int status;
  
    __libc_lock_lock (lock);
  
    status = internal_nis_getgrent_r (result, buffer, buflen, errnop);
  
    __libc_lock_unlock (lock);
  
    return status;
  }
  
  enum nss_status
  _nss_nis_getgrnam_r (const char *name, struct group *grp,
  		     char *buffer, size_t buflen, int *errnop)
  {
    if (name == NULL)
      {
        *errnop = EINVAL;
        return NSS_STATUS_UNAVAIL;
      }
  
    char *domain;
    if (__glibc_unlikely (yp_get_default_domain (&domain)))
      return NSS_STATUS_UNAVAIL;
  
    char *result;
    int len;
    int yperr = yp_match (domain, "group.byname", name, strlen (name), &result,
  			&len);
  
    if (__glibc_unlikely (yperr != YPERR_SUCCESS))
      {
        enum nss_status retval = yperr2nss (yperr);
  
        if (retval == NSS_STATUS_TRYAGAIN)
  	*errnop = errno;
        return retval;
      }
  
    if (__glibc_unlikely ((size_t) (len + 1) > buflen))
      {
        free (result);
        *errnop = ERANGE;
        return NSS_STATUS_TRYAGAIN;
      }
  
    char *p = strncpy (buffer, result, len);
    buffer[len] = '\0';
    while (isspace (*p))
      ++p;
    free (result);
  
    int parse_res = _nss_files_parse_grent (p, grp, (void *) buffer, buflen,
  					  errnop);
    if (__builtin_expect  (parse_res < 1, 0))
      {
        if (parse_res == -1)
  	return NSS_STATUS_TRYAGAIN;
        else
  	return NSS_STATUS_NOTFOUND;
      }
    return NSS_STATUS_SUCCESS;
  }
  
  enum nss_status
  _nss_nis_getgrgid_r (gid_t gid, struct group *grp,
  		     char *buffer, size_t buflen, int *errnop)
  {
    char *domain;
    if (__glibc_unlikely (yp_get_default_domain (&domain)))
      return NSS_STATUS_UNAVAIL;
  
    char buf[32];
    int nlen = sprintf (buf, "%lu", (unsigned long int) gid);
  
    char *result;
    int len;
    int yperr = yp_match (domain, "group.bygid", buf, nlen, &result, &len);
  
    if (__glibc_unlikely (yperr != YPERR_SUCCESS))
      {
        enum nss_status retval = yperr2nss (yperr);
  
        if (retval == NSS_STATUS_TRYAGAIN)
  	*errnop = errno;
        return retval;
      }
  
    if (__glibc_unlikely ((size_t) (len + 1) > buflen))
      {
        free (result);
        *errnop = ERANGE;
        return NSS_STATUS_TRYAGAIN;
      }
  
    char *p = strncpy (buffer, result, len);
    buffer[len] = '\0';
    while (isspace (*p))
      ++p;
    free (result);
  
    int parse_res = _nss_files_parse_grent (p, grp, (void *) buffer, buflen,
  					  errnop);
    if (__glibc_unlikely (parse_res < 1))
      {
        if (parse_res == -1)
  	return NSS_STATUS_TRYAGAIN;
        else
  	return NSS_STATUS_NOTFOUND;
      }
    return NSS_STATUS_SUCCESS;
  }
  