nis/nss_nis/nis-network.c

   1 /* Copyright (C) 1996-2003, 2006 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Thorsten Kukuk <kukuk@vt.uni-paderborn.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 <nss.h>
  21 /* The following is an ugly trick to avoid a prototype declaration for
  22    _nss_nis_endgrent.  */
  23 #define _nss_nis_endnetent _nss_nis_endnetent_XXX
  24 #include <netdb.h>
  25 #undef _nss_nis_endnetent
  26 #include <ctype.h>
  27 #include <errno.h>
  28 #include <stdint.h>
  29 #include <string.h>
  30 #include <netinet/in.h>
  31 #include <arpa/inet.h>
  32 #include <bits/libc-lock.h>
  33 #include <rpcsvc/yp.h>
  34 #include <rpcsvc/ypclnt.h>
  35
  36 #include "nss-nis.h"
  37
  38 /* Get the declaration of the parser function.  */
  39 #define ENTNAME netent
  40 #define EXTERN_PARSER
  41 #include <nss/nss_files/files-parse.c>
  42
  43 __libc_lock_define_initialized (static, lock)
  44
  45 static bool_t new_start = 1;
  46 static char *oldkey;
  47 static int oldkeylen;
  48
  49 enum nss_status
  50 _nss_nis_setnetent (int stayopen)
  51 {
  52   __libc_lock_lock (lock);
  53
  54   new_start = 1;
  55   if (oldkey != NULL)
  56     {
  57       free (oldkey);
  58       oldkey = NULL;
  59       oldkeylen = 0;
  60     }
  61
  62   __libc_lock_unlock (lock);
  63
  64   return NSS_STATUS_SUCCESS;
  65 }
  66 /* Make _nss_nis_endnetent an alias of _nss_nis_setnetent.  We do this
  67    even though the prototypes don't match.  The argument of setnetent
  68    is not used so this makes no difference.  */
  69 strong_alias (_nss_nis_setnetent, _nss_nis_endnetent)
  70
  71 static enum nss_status
  72 internal_nis_getnetent_r (struct netent *net, char *buffer, size_t buflen,
  73                           int *errnop, int *herrnop)
  74 {
  75   struct parser_data *data = (void *) buffer;
  76
  77   char *domain;
  78   if (__builtin_expect (yp_get_default_domain (&domain), 0))
  79     return NSS_STATUS_UNAVAIL;
  80
  81   /* Get the next entry until we found a correct one. */
  82   int parse_res;
  83   do
  84     {
  85       char *result;
  86       char *outkey;
  87       int len;
  88       int keylen;
  89       int yperr;
  90
  91       if (new_start)
  92         yperr = yp_first (domain, "networks.byname", &outkey, &keylen, &result,
  93                           &len);
  94       else
  95         yperr = yp_next (domain, "networks.byname", oldkey, oldkeylen, &outkey,
  96                          &keylen, &result, &len);
  97
  98       if (__builtin_expect (yperr != YPERR_SUCCESS, 0))
  99         {
 100           enum nss_status retval = yperr2nss (yperr);
 101
 102           if (retval == NSS_STATUS_TRYAGAIN)
 103             {
 104               *herrnop = NETDB_INTERNAL;
 105               *errnop = errno;
 106             }
 107           return retval;
 108         }
 109
 110       if (__builtin_expect ((size_t) (len + 1) > buflen, 0))
 111         {
 112           free (result);
 113           *errnop = ERANGE;
 114           *herrnop = NETDB_INTERNAL;
 115           return NSS_STATUS_TRYAGAIN;
 116         }
 117
 118       char *p = strncpy (buffer, result, len);
 119       buffer[len] = '\0';
 120       while (isspace (*p))
 121         ++p;
 122       free (result);
 123
 124       parse_res = _nss_files_parse_netent (p, net, data, buflen, errnop);
 125       if (__builtin_expect (parse_res == -1, 0))
 126         {
 127           free (outkey);
 128           *herrnop = NETDB_INTERNAL;
 129           *errnop = ERANGE;
 130           return NSS_STATUS_TRYAGAIN;
 131         }
 132
 133       free (oldkey);
 134       oldkey = outkey;
 135       oldkeylen = keylen;
 136       new_start = 0;
 137     }
 138   while (!parse_res);
 139
 140   return NSS_STATUS_SUCCESS;
 141 }
 142
 143 enum nss_status
 144 _nss_nis_getnetent_r (struct netent *net, char *buffer, size_t buflen,
 145                       int *errnop, int *herrnop)
 146 {
 147   enum nss_status status;
 148
 149   __libc_lock_lock (lock);
 150
 151   status = internal_nis_getnetent_r (net, buffer, buflen, errnop, herrnop);
 152
 153   __libc_lock_unlock (lock);
 154
 155   return status;
 156 }
 157
 158 enum nss_status
 159 _nss_nis_getnetbyname_r (const char *name, struct netent *net, char *buffer,
 160                          size_t buflen, int *errnop, int *herrnop)
 161 {
 162   if (name == NULL)
 163     {
 164       *errnop = EINVAL;
 165       *herrnop = NETDB_INTERNAL;
 166       return NSS_STATUS_UNAVAIL;
 167     }
 168
 169   char *domain;
 170   if (__builtin_expect (yp_get_default_domain (&domain), 0))
 171     return NSS_STATUS_UNAVAIL;
 172
 173   struct parser_data *data = (void *) buffer;
 174   if (buflen < sizeof *data + 1)
 175     {
 176       *herrnop = NETDB_INTERNAL;
 177       *errnop = ERANGE;
 178       return NSS_STATUS_TRYAGAIN;
 179     }
 180
 181   /* Convert name to lowercase.  */
 182   size_t namlen = strlen (name);
 183   char name2[namlen + 1];
 184   size_t i;
 185
 186   for (i = 0; i < namlen; ++i)
 187     name2[i] = _tolower (name[i]);
 188   name2[i] = '\0';
 189
 190   char *result;
 191   int len;
 192   int yperr = yp_match (domain, "networks.byname", name2, namlen, &result,
 193                         &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         {
 201           *errnop = errno;
 202           *herrnop = NETDB_INTERNAL;
 203         }
 204       return retval;
 205     }
 206
 207   if (__builtin_expect ((size_t) (len + 1) > buflen, 0))
 208     {
 209       free (result);
 210       *errnop = ERANGE;
 211       *herrnop = NETDB_INTERNAL;
 212       return NSS_STATUS_TRYAGAIN;
 213     }
 214
 215   char *p = strncpy (buffer, result, len);
 216   buffer[len] = '\0';
 217   while (isspace (*p))
 218     ++p;
 219   free (result);
 220
 221   int parse_res = _nss_files_parse_netent (p, net, data, buflen, errnop);
 222
 223   if (__builtin_expect (parse_res < 1, 0))
 224     {
 225       *herrnop = NETDB_INTERNAL;
 226       if (parse_res == -1)
 227         return NSS_STATUS_TRYAGAIN;
 228       else
 229         return NSS_STATUS_NOTFOUND;
 230     }
 231   else
 232     return NSS_STATUS_SUCCESS;
 233 }
 234
 235 enum nss_status
 236 _nss_nis_getnetbyaddr_r (uint32_t addr, int type, struct netent *net,
 237                          char *buffer, size_t buflen, int *errnop,
 238                          int *herrnop)
 239 {
 240   char *domain;
 241   if (__builtin_expect (yp_get_default_domain (&domain), 0))
 242     return NSS_STATUS_UNAVAIL;
 243
 244   struct in_addr in = inet_makeaddr (addr, 0);
 245   char *buf = inet_ntoa (in);
 246   size_t blen = strlen (buf);
 247
 248   while (1)
 249     {
 250       char *result;
 251       int len;
 252
 253       int yperr = yp_match (domain, "networks.byaddr", buf, blen, &result,
 254                             &len);
 255
 256       if (__builtin_expect (yperr != YPERR_SUCCESS, 0))
 257           {
 258             enum nss_status retval = yperr2nss (yperr);
 259
 260             if (retval == NSS_STATUS_NOTFOUND)
 261               {
 262                 if (buf[blen - 2] == '.' && buf[blen - 1] == '0')
 263                   {
 264                     /* Try again, but with trailing dot(s)
 265                        removed (one by one) */
 266                     buf[blen - 2] = '\0';
 267                     blen -= 2;
 268                     continue;
 269                   }
 270                 else
 271                   return NSS_STATUS_NOTFOUND;
 272               }
 273             else
 274               {
 275                 if (retval == NSS_STATUS_TRYAGAIN)
 276                   *errnop = errno;
 277                 return retval;
 278               }
 279           }
 280
 281       if (__builtin_expect ((size_t) (len + 1) > buflen, 0))
 282         {
 283           free (result);
 284           *errnop = ERANGE;
 285           *herrnop = NETDB_INTERNAL;
 286           return NSS_STATUS_TRYAGAIN;
 287         }
 288
 289         char *p = strncpy (buffer, result, len);
 290         buffer[len] = '\0';
 291         while (isspace (*p))
 292           ++p;
 293         free (result);
 294
 295         int parse_res = _nss_files_parse_netent (p, net, (void *) buffer,
 296                                                  buflen, errnop);
 297
 298         if (__builtin_expect (parse_res < 1, 0))
 299           {
 300             *herrnop = NETDB_INTERNAL;
 301             if (parse_res == -1)
 302               return NSS_STATUS_TRYAGAIN;
 303             else
 304               return NSS_STATUS_NOTFOUND;
 305           }
 306         else
 307           return NSS_STATUS_SUCCESS;
 308     }
 309 }