nis/nss_nis/nis-grp.c

   1 /* Copyright (C) 1996-2015 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, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <ctype.h>
  20 #include <errno.h>
  21 #include <grp.h>
  22 #include <nss.h>
  23 #include <string.h>
  24 #include <bits/libc-lock.h>
  25 #include <rpcsvc/yp.h>
  26 #include <rpcsvc/ypclnt.h>
  27
  28 #include "nss-nis.h"
  29 #include <libnsl.h>
  30
  31 /* Get the declaration of the parser function.  */
  32 #define ENTNAME grent
  33 #define STRUCTURE group
  34 #define EXTERN_PARSER
  35 #include <nss/nss_files/files-parse.c>
  36
  37 /* Protect global state against multiple changers */
  38 __libc_lock_define_initialized (static, lock)
  39
  40 static bool_t new_start = 1;
  41 static char *oldkey;
  42 static int oldkeylen;
  43 static intern_t intern;
  44
  45
  46 static void
  47 internal_nis_endgrent (void)
  48 {
  49   new_start = 1;
  50   if (oldkey != NULL)
  51     {
  52       free (oldkey);
  53       oldkey = NULL;
  54       oldkeylen = 0;
  55     }
  56
  57   struct response_t *curr = intern.start;
  58
  59   while (curr != NULL)
  60     {
  61       struct response_t *last = curr;
  62       curr = curr->next;
  63       free (last);
  64     }
  65
  66   intern.next = intern.start = NULL;
  67 }
  68
  69
  70 enum nss_status
  71 _nss_nis_endgrent (void)
  72 {
  73   __libc_lock_lock (lock);
  74
  75   internal_nis_endgrent ();
  76
  77   __libc_lock_unlock (lock);
  78
  79   return NSS_STATUS_SUCCESS;
  80 }
  81
  82
  83 enum nss_status
  84 internal_nis_setgrent (void)
  85 {
  86   /* We have to read all the data now.  */
  87   char *domain;
  88   if (__glibc_unlikely (yp_get_default_domain (&domain)))
  89     return NSS_STATUS_UNAVAIL;
  90
  91   struct ypall_callback ypcb;
  92
  93   ypcb.foreach = _nis_saveit;
  94   ypcb.data = (char *) &intern;
  95   enum nss_status status = yperr2nss (yp_all (domain, "group.byname", &ypcb));
  96
  97
  98   /* Mark the last buffer as full.  */
  99   if (intern.next != NULL)
 100     intern.next->size = intern.offset;
 101
 102   intern.next = intern.start;
 103   intern.offset = 0;
 104
 105   return status;
 106 }
 107
 108
 109 enum nss_status
 110 _nss_nis_setgrent (int stayopen)
 111 {
 112   enum nss_status result = NSS_STATUS_SUCCESS;
 113
 114   __libc_lock_lock (lock);
 115
 116   internal_nis_endgrent ();
 117
 118   if (_nsl_default_nss () & NSS_FLAG_SETENT_BATCH_READ)
 119     result = internal_nis_setgrent ();
 120
 121   __libc_lock_unlock (lock);
 122
 123   return result;
 124 }
 125
 126
 127 static enum nss_status
 128 internal_nis_getgrent_r (struct group *grp, char *buffer, size_t buflen,
 129                          int *errnop)
 130 {
 131   /* If we read the entire database at setpwent time we just iterate
 132      over the data we have in memory.  */
 133   bool batch_read = intern.start != NULL;
 134
 135   char *domain = NULL;
 136   if (!batch_read && __builtin_expect (yp_get_default_domain (&domain), 0))
 137     return NSS_STATUS_UNAVAIL;
 138
 139   /* Get the next entry until we found a correct one. */
 140   int parse_res;
 141   do
 142     {
 143       char *result;
 144       char *outkey;
 145       int len;
 146       int keylen;
 147
 148       if (batch_read)
 149         {
 150           struct response_t *bucket;
 151
 152         handle_batch_read:
 153           bucket = intern.next;
 154
 155           if (__glibc_unlikely (intern.offset >= bucket->size))
 156             {
 157               if (bucket->next == NULL)
 158                 return NSS_STATUS_NOTFOUND;
 159
 160               /* We look at all the content in the current bucket.  Go on
 161                  to the next.  */
 162               bucket = intern.next = bucket->next;
 163               intern.offset = 0;
 164             }
 165
 166           for (result = &bucket->mem[intern.offset]; isspace (*result);
 167                ++result)
 168             ++intern.offset;
 169
 170           len = strlen (result);
 171         }
 172       else
 173         {
 174           int yperr;
 175
 176           if (new_start)
 177             {
 178               /* Maybe we should read the database in one piece.  */
 179               if ((_nsl_default_nss () & NSS_FLAG_SETENT_BATCH_READ)
 180                   && internal_nis_setgrent () == NSS_STATUS_SUCCESS
 181                   && intern.start != NULL)
 182                 {
 183                   batch_read = true;
 184                   goto handle_batch_read;
 185                 }
 186
 187               yperr = yp_first (domain, "group.byname", &outkey, &keylen,
 188                                 &result, &len);
 189             }
 190           else
 191             yperr = yp_next (domain, "group.byname", oldkey, oldkeylen,
 192                              &outkey, &keylen, &result, &len);
 193
 194           if (__glibc_unlikely (yperr != YPERR_SUCCESS))
 195             {
 196               enum nss_status retval = yperr2nss (yperr);
 197
 198               if (retval == NSS_STATUS_TRYAGAIN)
 199                 *errnop = errno;
 200               return retval;
 201             }
 202         }
 203
 204       if (__glibc_unlikely ((size_t) (len + 1) > buflen))
 205         {
 206           if (!batch_read)
 207             free (result);
 208           *errnop = ERANGE;
 209           return NSS_STATUS_TRYAGAIN;
 210         }
 211
 212       char *p = strncpy (buffer, result, len);
 213       buffer[len] = '\0';
 214       while (isspace (*p))
 215         ++p;
 216       if (!batch_read)
 217         free (result);
 218
 219       parse_res = _nss_files_parse_grent (p, grp, (void *) buffer, buflen,
 220                                           errnop);
 221       if (__glibc_unlikely (parse_res == -1))
 222         {
 223           if (!batch_read)
 224             free (outkey);
 225           *errnop = ERANGE;
 226           return NSS_STATUS_TRYAGAIN;
 227         }
 228
 229       if (batch_read)
 230         intern.offset += len + 1;
 231       else
 232         {
 233           free (oldkey);
 234           oldkey = outkey;
 235           oldkeylen = keylen;
 236           new_start = 0;
 237         }
 238     }
 239   while (parse_res < 1);
 240
 241   return NSS_STATUS_SUCCESS;
 242 }
 243
 244 enum nss_status
 245 _nss_nis_getgrent_r (struct group *result, char *buffer, size_t buflen,
 246                      int *errnop)
 247 {
 248   int status;
 249
 250   __libc_lock_lock (lock);
 251
 252   status = internal_nis_getgrent_r (result, buffer, buflen, errnop);
 253
 254   __libc_lock_unlock (lock);
 255
 256   return status;
 257 }
 258
 259 enum nss_status
 260 _nss_nis_getgrnam_r (const char *name, struct group *grp,
 261                      char *buffer, size_t buflen, int *errnop)
 262 {
 263   if (name == NULL)
 264     {
 265       *errnop = EINVAL;
 266       return NSS_STATUS_UNAVAIL;
 267     }
 268
 269   char *domain;
 270   if (__glibc_unlikely (yp_get_default_domain (&domain)))
 271     return NSS_STATUS_UNAVAIL;
 272
 273   char *result;
 274   int len;
 275   int yperr = yp_match (domain, "group.byname", name, strlen (name), &result,
 276                         &len);
 277
 278   if (__glibc_unlikely (yperr != YPERR_SUCCESS))
 279     {
 280       enum nss_status retval = yperr2nss (yperr);
 281
 282       if (retval == NSS_STATUS_TRYAGAIN)
 283         *errnop = errno;
 284       return retval;
 285     }
 286
 287   if (__glibc_unlikely ((size_t) (len + 1) > buflen))
 288     {
 289       free (result);
 290       *errnop = ERANGE;
 291       return NSS_STATUS_TRYAGAIN;
 292     }
 293
 294   char *p = strncpy (buffer, result, len);
 295   buffer[len] = '\0';
 296   while (isspace (*p))
 297     ++p;
 298   free (result);
 299
 300   int parse_res = _nss_files_parse_grent (p, grp, (void *) buffer, buflen,
 301                                           errnop);
 302   if (__builtin_expect  (parse_res < 1, 0))
 303     {
 304       if (parse_res == -1)
 305         return NSS_STATUS_TRYAGAIN;
 306       else
 307         return NSS_STATUS_NOTFOUND;
 308     }
 309   return NSS_STATUS_SUCCESS;
 310 }
 311
 312 enum nss_status
 313 _nss_nis_getgrgid_r (gid_t gid, struct group *grp,
 314                      char *buffer, size_t buflen, int *errnop)
 315 {
 316   char *domain;
 317   if (__glibc_unlikely (yp_get_default_domain (&domain)))
 318     return NSS_STATUS_UNAVAIL;
 319
 320   char buf[32];
 321   int nlen = sprintf (buf, "%lu", (unsigned long int) gid);
 322
 323   char *result;
 324   int len;
 325   int yperr = yp_match (domain, "group.bygid", buf, nlen, &result, &len);
 326
 327   if (__glibc_unlikely (yperr != YPERR_SUCCESS))
 328     {
 329       enum nss_status retval = yperr2nss (yperr);
 330
 331       if (retval == NSS_STATUS_TRYAGAIN)
 332         *errnop = errno;
 333       return retval;
 334     }
 335
 336   if (__glibc_unlikely ((size_t) (len + 1) > buflen))
 337     {
 338       free (result);
 339       *errnop = ERANGE;
 340       return NSS_STATUS_TRYAGAIN;
 341     }
 342
 343   char *p = strncpy (buffer, result, len);
 344   buffer[len] = '\0';
 345   while (isspace (*p))
 346     ++p;
 347   free (result);
 348
 349   int parse_res = _nss_files_parse_grent (p, grp, (void *) buffer, buflen,
 350                                           errnop);
 351   if (__glibc_unlikely (parse_res < 1))
 352     {
 353       if (parse_res == -1)
 354         return NSS_STATUS_TRYAGAIN;
 355       else
 356         return NSS_STATUS_NOTFOUND;
 357     }
 358   return NSS_STATUS_SUCCESS;
 359 }