nis/nss_nis/nis-network.c

   1 /* Copyright (C) 1996-2000, 2001, 2002, 2003 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   char *domain, *result, *outkey;
  77   int len, keylen, parse_res;
  78
  79   if (yp_get_default_domain (&domain))
  80     return NSS_STATUS_UNAVAIL;
  81
  82   /* Get the next entry until we found a correct one. */
  83   do
  84     {
  85       enum nss_status retval;
  86       char *p;
  87
  88       if (new_start)
  89         retval = yperr2nss (yp_first (domain, "networks.byname",
  90                                       &outkey, &keylen, &result, &len));
  91       else
  92         retval = yperr2nss ( yp_next (domain, "networks.byname",
  93                                       oldkey, oldkeylen,
  94                                       &outkey, &keylen, &result, &len));
  95
  96       if (retval != NSS_STATUS_SUCCESS)
  97         {
  98           if (retval == NSS_STATUS_TRYAGAIN)
  99             {
 100               *herrnop = NETDB_INTERNAL;
 101               *errnop = errno;
 102             }
 103           return retval;
 104         }
 105
 106       if ((size_t) (len + 1) > buflen)
 107         {
 108           free (result);
 109           *errnop = ERANGE;
 110           *herrnop = NETDB_INTERNAL;
 111           return NSS_STATUS_TRYAGAIN;
 112         }
 113
 114       p = strncpy (buffer, result, len);
 115       buffer[len] = '\0';
 116       while (isspace (*p))
 117         ++p;
 118       free (result);
 119
 120       parse_res = _nss_files_parse_netent (p, net, data, buflen, errnop);
 121       if (parse_res == -1)
 122         {
 123           free (outkey);
 124           *herrnop = NETDB_INTERNAL;
 125           *errnop = ERANGE;
 126           return NSS_STATUS_TRYAGAIN;
 127         }
 128
 129       free (oldkey);
 130       oldkey = outkey;
 131       oldkeylen = keylen;
 132       new_start = 0;
 133     }
 134   while (!parse_res);
 135
 136   return NSS_STATUS_SUCCESS;
 137 }
 138
 139 enum nss_status
 140 _nss_nis_getnetent_r (struct netent *net, char *buffer, size_t buflen,
 141                       int *errnop, int *herrnop)
 142 {
 143   enum nss_status status;
 144
 145   __libc_lock_lock (lock);
 146
 147   status = internal_nis_getnetent_r (net, buffer, buflen, errnop, herrnop);
 148
 149   __libc_lock_unlock (lock);
 150
 151   return status;
 152 }
 153
 154 enum nss_status
 155 _nss_nis_getnetbyname_r (const char *name, struct netent *net, char *buffer,
 156                          size_t buflen, int *errnop, int *herrnop)
 157 {
 158   enum nss_status retval;
 159   struct parser_data *data = (void *) buffer;
 160   char *domain, *result, *p;
 161   int len, parse_res;
 162
 163   if (name == NULL)
 164     {
 165       *errnop = EINVAL;
 166       *herrnop = NETDB_INTERNAL;
 167       return NSS_STATUS_UNAVAIL;
 168     }
 169
 170   if (yp_get_default_domain (&domain))
 171     return NSS_STATUS_UNAVAIL;
 172
 173   if (buflen < sizeof *data + 1)
 174     {
 175       *herrnop = NETDB_INTERNAL;
 176       *errnop = ERANGE;
 177       return NSS_STATUS_TRYAGAIN;
 178     }
 179   else
 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       retval = yperr2nss (yp_match (domain, "networks.byname", name2,
 191                                     namlen, &result, &len));
 192     }
 193
 194
 195   if (retval != NSS_STATUS_SUCCESS)
 196     {
 197       if (retval == NSS_STATUS_TRYAGAIN)
 198         {
 199           *errnop = errno;
 200           *herrnop = NETDB_INTERNAL;
 201         }
 202       return retval;
 203     }
 204
 205   if ((size_t) (len + 1) > buflen)
 206     {
 207       free (result);
 208       *errnop = ERANGE;
 209       *herrnop = NETDB_INTERNAL;
 210       return NSS_STATUS_TRYAGAIN;
 211     }
 212
 213   p = strncpy (buffer, result, len);
 214   buffer[len] = '\0';
 215   while (isspace (*p))
 216     ++p;
 217   free (result);
 218
 219   parse_res = _nss_files_parse_netent (p, net, data, buflen, errnop);
 220
 221   if (parse_res < 1)
 222     {
 223       *herrnop = NETDB_INTERNAL;
 224       if (parse_res == -1)
 225         return NSS_STATUS_TRYAGAIN;
 226       else
 227         return NSS_STATUS_NOTFOUND;
 228     }
 229   else
 230     return NSS_STATUS_SUCCESS;
 231 }
 232
 233 enum nss_status
 234 _nss_nis_getnetbyaddr_r (uint32_t addr, int type, struct netent *net,
 235                          char *buffer, size_t buflen, int *errnop,
 236                          int *herrnop)
 237 {
 238   struct parser_data *data = (void *) buffer;
 239   char *domain;
 240   char *result;
 241   int len;
 242   char buf[256];
 243   int blen;
 244   struct in_addr in;
 245   char *p;
 246
 247   if (yp_get_default_domain (&domain))
 248     return NSS_STATUS_UNAVAIL;
 249
 250   in = inet_makeaddr (addr, 0);
 251   strcpy (buf, inet_ntoa (in));
 252   blen = strlen (buf);
 253
 254   while (1)
 255     {
 256       enum nss_status retval;
 257       int parse_res;
 258
 259       retval = yperr2nss (yp_match (domain, "networks.byaddr", buf,
 260                                     strlen (buf), &result, &len));
 261
 262         if (retval != NSS_STATUS_SUCCESS)
 263           {
 264             if (retval == NSS_STATUS_NOTFOUND)
 265               {
 266                 if (buf[blen - 2] == '.' && buf[blen - 1] == '0')
 267                   {
 268                     /* Try again, but with trailing dot(s)
 269                        removed (one by one) */
 270                     buf[blen - 2] = '\0';
 271                     blen -= 2;
 272                     continue;
 273                   }
 274                 else
 275                   return NSS_STATUS_NOTFOUND;
 276               }
 277             else
 278               {
 279                 if (retval == NSS_STATUS_TRYAGAIN)
 280                   *errnop = errno;
 281                 return retval;
 282               }
 283           }
 284
 285       if ((size_t) (len + 1) > buflen)
 286         {
 287           free (result);
 288           *errnop = ERANGE;
 289           *herrnop = NETDB_INTERNAL;
 290           return NSS_STATUS_TRYAGAIN;
 291         }
 292
 293         p = strncpy (buffer, result, len);
 294         buffer[len] = '\0';
 295         while (isspace (*p))
 296           ++p;
 297         free (result);
 298
 299         parse_res = _nss_files_parse_netent (p, net, data, buflen, errnop);
 300
 301         if (parse_res < 1)
 302           {
 303             *herrnop = NETDB_INTERNAL;
 304             if (parse_res == -1)
 305               return NSS_STATUS_TRYAGAIN;
 306             else
 307               return NSS_STATUS_NOTFOUND;
 308           }
 309         else
 310           return NSS_STATUS_SUCCESS;
 311     }
 312 }