nis/nss_nis/nis-grp.c

   1 /* Copyright (C) 1996-1999,2001-2004,2006,2009 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Thorsten Kukuk <kukuk@suse.de>, 1996.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <ctype.h>
  21 #include <errno.h>
  22 #include <grp.h>
  23 #include <nss.h>
  24 #include <string.h>
  25 #include <bits/libc-lock.h>
  26 #include <rpcsvc/yp.h>
  27 #include <rpcsvc/ypclnt.h>
  28
  29 #include "nss-nis.h"
  30 #include <libnsl.h>
  31
  32 /* Get the declaration of the parser function.  */
  33 #define ENTNAME grent
  34 #define STRUCTURE group
  35 #define EXTERN_PARSER
  36 #include <nss/nss_files/files-parse.c>
  37
  38 /* Protect global state against multiple changers */
  39 __libc_lock_define_initialized (static, lock)
  40
  41 static bool_t new_start = 1;
  42 static char *oldkey;
  43 static int oldkeylen;
  44 static intern_t intern;
  45
  46
  47 static void
  48 internal_nis_endgrent (void)
  49 {
  50   new_start = 1;
  51   if (oldkey != NULL)
  52     {
  53       free (oldkey);
  54       oldkey = NULL;
  55       oldkeylen = 0;
  56     }
  57
  58   struct response_t *curr = intern.start;
  59
  60   while (curr != NULL)
  61     {
  62       struct response_t *last = curr;
  63       curr = curr->next;
  64       free (last);
  65     }
  66
  67   intern.next = intern.start = NULL;
  68 }
  69
  70
  71 enum nss_status
  72 _nss_nis_endgrent (void)
  73 {
  74   __libc_lock_lock (lock);
  75
  76   internal_nis_endgrent ();
  77
  78   __libc_lock_unlock (lock);
  79
  80   return NSS_STATUS_SUCCESS;
  81 }
  82
  83
  84 enum nss_status
  85 internal_nis_setgrent (void)
  86 {
  87   /* We have to read all the data now.  */
  88   char *domain;
  89   if (__builtin_expect (yp_get_default_domain (&domain), 0))
  90     return NSS_STATUS_UNAVAIL;
  91
  92   struct ypall_callback ypcb;
  93
  94   ypcb.foreach = _nis_saveit;
  95   ypcb.data = (char *) &intern;
  96   enum nss_status status = yperr2nss (yp_all (domain, "group.byname", &ypcb));
  97
  98
  99   /* Mark the last buffer as full.  */
 100   if (intern.next != NULL)
 101     intern.next->size = intern.offset;
 102
 103   intern.next = intern.start;
 104   intern.offset = 0;
 105
 106   return status;
 107 }
 108
 109
 110 enum nss_status
 111 _nss_nis_setgrent (int stayopen)
 112 {
 113   enum nss_status result = NSS_STATUS_SUCCESS;
 114
 115   __libc_lock_lock (lock);
 116
 117   internal_nis_endgrent ();
 118
 119   if (_nsl_default_nss () & NSS_FLAG_SETENT_BATCH_READ)
 120     result = internal_nis_setgrent ();
 121
 122   __libc_lock_unlock (lock);
 123
 124   return result;
 125 }
 126
 127
 128 static enum nss_status
 129 internal_nis_getgrent_r (struct group *grp, char *buffer, size_t buflen,
 130                          int *errnop)
 131 {
 132   /* If we read the entire database at setpwent time we just iterate
 133      over the data we have in memory.  */
 134   bool batch_read = intern.start != NULL;
 135
 136   char *domain = NULL;
 137   if (!batch_read && __builtin_expect (yp_get_default_domain (&domain), 0))
 138     return NSS_STATUS_UNAVAIL;
 139
 140   /* Get the next entry until we found a correct one. */
 141   int parse_res;
 142   do
 143     {
 144       char *result;
 145       char *outkey;
 146       int len;
 147       int keylen;
 148
 149       if (batch_read)
 150         {
 151           struct response_t *bucket;
 152
 153         handle_batch_read:
 154           bucket = intern.next;
 155
 156           if (__builtin_expect (intern.offset >= bucket->size, 0))
 157             {
 158               if (bucket->next == NULL)
 159                 return NSS_STATUS_NOTFOUND;
 160
 161               /* We look at all the content in the current bucket.  Go on
 162                  to the next.  */
 163               bucket = intern.next = bucket->next;
 164               intern.offset = 0;
 165             }
 166
 167           for (result = &bucket->mem[intern.offset]; isspace (*result);
 168                ++result)
 169             ++intern.offset;
 170
 171           len = strlen (result);
 172         }
 173       else
 174         {
 175           int yperr;
 176
 177           if (new_start)
 178             {
 179               /* Maybe we should read the database in one piece.  */
 180               if ((_nsl_default_nss () & NSS_FLAG_SETENT_BATCH_READ)
 181                   && internal_nis_setgrent () == NSS_STATUS_SUCCESS
 182                   && intern.start != NULL)
 183                 {
 184                   batch_read = true;
 185                   goto handle_batch_read;
 186                 }
 187
 188               yperr = yp_first (domain, "group.byname", &outkey, &keylen,
 189                                 &result, &len);
 190             }
 191           else
 192             yperr = yp_next (domain, "group.byname", oldkey, oldkeylen,
 193                              &outkey, &keylen, &result, &len);
 194
 195           if (__builtin_expect (yperr != YPERR_SUCCESS, 0))
 196             {
 197               enum nss_status retval = yperr2nss (yperr);
 198
 199               if (retval == NSS_STATUS_TRYAGAIN)
 200                 *errnop = errno;
 201               return retval;
 202             }
 203         }
 204
 205       if (__builtin_expect ((size_t) (len + 1) > buflen, 0))
 206         {
 207           if (!batch_read)
 208             free (result);
 209           *errnop = ERANGE;
 210           return NSS_STATUS_TRYAGAIN;
 211         }
 212
 213       char *p = strncpy (buffer, result, len);
 214       buffer[len] = '\0';
 215       while (isspace (*p))
 216         ++p;
 217       if (!batch_read)
 218         free (result);
 219
 220       parse_res = _nss_files_parse_grent (p, grp, (void *) buffer, buflen,
 221                                           errnop);
 222       if (__builtin_expect (parse_res == -1, 0))
 223         {
 224           if (!batch_read)
 225             free (outkey);
 226           *errnop = ERANGE;
 227           return NSS_STATUS_TRYAGAIN;
 228         }
 229
 230       if (batch_read)
 231         intern.offset += len + 1;
 232       else
 233         {
 234           free (oldkey);
 235           oldkey = outkey;
 236           oldkeylen = keylen;
 237           new_start = 0;
 238         }
 239     }
 240   while (parse_res < 1);
 241
 242   return NSS_STATUS_SUCCESS;
 243 }
 244
 245 enum nss_status
 246 _nss_nis_getgrent_r (struct group *result, char *buffer, size_t buflen,
 247                      int *errnop)
 248 {
 249   int status;
 250
 251   __libc_lock_lock (lock);
 252
 253   status = internal_nis_getgrent_r (result, buffer, buflen, errnop);
 254
 255   __libc_lock_unlock (lock);
 256
 257   return status;
 258 }
 259
 260 enum nss_status
 261 _nss_nis_getgrnam_r (const char *name, struct group *grp,
 262                      char *buffer, size_t buflen, int *errnop)
 263 {
 264   if (name == NULL)
 265     {
 266       *errnop = EINVAL;
 267       return NSS_STATUS_UNAVAIL;
 268     }
 269
 270   char *domain;
 271   if (__builtin_expect (yp_get_default_domain (&domain), 0))
 272     return NSS_STATUS_UNAVAIL;
 273
 274   char *result;
 275   int len;
 276   int yperr = yp_match (domain, "group.byname", name, strlen (name), &result,
 277                         &len);
 278
 279   if (__builtin_expect (yperr != YPERR_SUCCESS, 0))
 280     {
 281       enum nss_status retval = yperr2nss (yperr);
 282
 283       if (retval == NSS_STATUS_TRYAGAIN)
 284         *errnop = errno;
 285       return retval;
 286     }
 287
 288   if (__builtin_expect ((size_t) (len + 1) > buflen, 0))
 289     {
 290       free (result);
 291       *errnop = ERANGE;
 292       return NSS_STATUS_TRYAGAIN;
 293     }
 294
 295   char *p = strncpy (buffer, result, len);
 296   buffer[len] = '\0';
 297   while (isspace (*p))
 298     ++p;
 299   free (result);
 300
 301   int parse_res = _nss_files_parse_grent (p, grp, (void *) buffer, buflen,
 302                                           errnop);
 303   if (__builtin_expect  (parse_res < 1, 0))
 304     {
 305       if (parse_res == -1)
 306         return NSS_STATUS_TRYAGAIN;
 307       else
 308         return NSS_STATUS_NOTFOUND;
 309     }
 310   return NSS_STATUS_SUCCESS;
 311 }
 312
 313 enum nss_status
 314 _nss_nis_getgrgid_r (gid_t gid, struct group *grp,
 315                      char *buffer, size_t buflen, int *errnop)
 316 {
 317   char *domain;
 318   if (__builtin_expect (yp_get_default_domain (&domain), 0))
 319     return NSS_STATUS_UNAVAIL;
 320
 321   char buf[32];
 322   int nlen = sprintf (buf, "%lu", (unsigned long int) gid);
 323
 324   char *result;
 325   int len;
 326   int yperr = yp_match (domain, "group.bygid", buf, nlen, &result, &len);
 327
 328   if (__builtin_expect (yperr != YPERR_SUCCESS, 0))
 329     {
 330       enum nss_status retval = yperr2nss (yperr);
 331
 332       if (retval == NSS_STATUS_TRYAGAIN)
 333         *errnop = errno;
 334       return retval;
 335     }
 336
 337   if (__builtin_expect ((size_t) (len + 1) > buflen, 0))
 338     {
 339       free (result);
 340       *errnop = ERANGE;
 341       return NSS_STATUS_TRYAGAIN;
 342     }
 343
 344   char *p = strncpy (buffer, result, len);
 345   buffer[len] = '\0';
 346   while (isspace (*p))
 347     ++p;
 348   free (result);
 349
 350   int parse_res = _nss_files_parse_grent (p, grp, (void *) buffer, buflen,
 351                                           errnop);
 352   if (__builtin_expect (parse_res < 1, 0))
 353     {
 354       if (parse_res == -1)
 355         return NSS_STATUS_TRYAGAIN;
 356       else
 357         return NSS_STATUS_NOTFOUND;
 358     }
 359   return NSS_STATUS_SUCCESS;
 360 }