nis/nss_nis/nis-ethers.c

   1 /* Copyright (C) 1996 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 Library General Public License as
   7    published by the Free Software Foundation; either version 2 of the
   8    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    Library General Public License for more details.
  14
  15    You should have received a copy of the GNU Library General Public
  16    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  17    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18    Boston, MA 02111-1307, USA.  */
  19
  20 #include <nss.h>
  21 #include <ctype.h>
  22 #include <errno.h>
  23 #include <string.h>
  24 #include <libc-lock.h>
  25 #include <rpcsvc/yp.h>
  26 #include <rpcsvc/ypclnt.h>
  27 #include <netinet/if_ether.h>
  28
  29 #include "nss-nis.h"
  30
  31 /* Protect global state against multiple changers */
  32 __libc_lock_define_initialized (static, lock)
  33
  34 struct ether
  35 {
  36   char *e_name;
  37   struct ether_addr e_addr;
  38 };
  39
  40 static bool_t new_start = 1;
  41 static char *oldkey = NULL;
  42 static int oldkeylen = 0;
  43
  44 enum nss_status
  45 _nss_nis_setetherent (void)
  46 {
  47   __libc_lock_lock (lock);
  48
  49   new_start = 1;
  50   if (oldkey != NULL)
  51     {
  52       free (oldkey);
  53       oldkey = NULL;
  54       oldkeylen = 0;
  55     }
  56
  57   __libc_lock_unlock (lock);
  58
  59   return NSS_STATUS_SUCCESS;
  60 }
  61
  62 enum nss_status
  63 _nss_nis_endetherent (void)
  64 {
  65   __libc_lock_lock (lock);
  66
  67   new_start = 1;
  68   if (oldkey != NULL)
  69     {
  70       free (oldkey);
  71       oldkey = NULL;
  72       oldkeylen = 0;
  73     }
  74
  75   __libc_lock_unlock (lock);
  76
  77   return NSS_STATUS_SUCCESS;
  78 }
  79
  80 static enum nss_status
  81 internal_nis_getetherent_r (struct ether *eth, char *buffer, size_t buflen)
  82 {
  83   char *domain, *result, *outkey;
  84   int len, keylen, parse_res;
  85
  86   if (yp_get_default_domain (&domain))
  87     return NSS_STATUS_UNAVAIL;
  88
  89   /* Get the next entry until we found a correct one. */
  90   do
  91     {
  92       enum nss_status retval;
  93       char *p;
  94
  95       if (new_start)
  96         retval = yperr2nss (yp_first (domain, "ethers.byaddr",
  97                                       &outkey, &keylen, &result, &len));
  98       else
  99         retval = yperr2nss ( yp_next (domain, "ethers.byaddr",
 100                                       oldkey, oldkeylen,
 101                                       &outkey, &keylen, &result, &len));
 102
 103       if (retval != NSS_STATUS_SUCCESS)
 104         {
 105           if (retval == NSS_STATUS_TRYAGAIN)
 106             __set_errno (EAGAIN);
 107           return retval;
 108         }
 109
 110       if ((size_t) (len + 1) > buflen)
 111         {
 112           free (result);
 113           __set_errno (ERANGE);
 114           return NSS_STATUS_TRYAGAIN;
 115         }
 116
 117       p = strncpy (buffer, result, len);
 118       buffer[len] = '\0';
 119       while (isspace (*p))
 120         ++p;
 121       free (result);
 122
 123       parse_res = _nss_files_parse_etherent (p, eth, buffer, buflen);
 124       if (!parse_res && errno == ERANGE)
 125         return NSS_STATUS_TRYAGAIN;
 126
 127       free (oldkey);
 128       oldkey = outkey;
 129       oldkeylen = keylen;
 130       new_start = 0;
 131     }
 132   while (!parse_res);
 133
 134   return NSS_STATUS_SUCCESS;
 135 }
 136
 137 enum nss_status
 138 _nss_nis_getetherent_r (struct ether *result, char *buffer, size_t buflen)
 139 {
 140   int status;
 141
 142   __libc_lock_lock (lock);
 143
 144   status = internal_nis_getetherent_r (result, buffer, buflen);
 145
 146   __libc_lock_unlock (lock);
 147
 148   return status;
 149 }
 150
 151 enum nss_status
 152 _nss_nis_getethernam_r (const char *name, struct ether *eth,
 153                         char *buffer, size_t buflen)
 154 {
 155   enum nss_status retval;
 156   char *domain, *result, *p;
 157   int len, parse_res;
 158
 159   if (name == NULL)
 160     {
 161       __set_errno (EINVAL);
 162       return NSS_STATUS_UNAVAIL;
 163     }
 164
 165   if (yp_get_default_domain (&domain))
 166     return NSS_STATUS_UNAVAIL;
 167
 168   retval = yperr2nss (yp_match (domain, "ethers.byname", name,
 169                                 strlen (name), &result, &len));
 170
 171   if (retval != NSS_STATUS_SUCCESS)
 172     {
 173       if (retval == NSS_STATUS_TRYAGAIN)
 174         __set_errno (EAGAIN);
 175       return retval;
 176     }
 177
 178   if ((size_t) (len + 1) > buflen)
 179     {
 180       free (result);
 181       __set_errno (ERANGE);
 182       return NSS_STATUS_TRYAGAIN;
 183     }
 184
 185   p = strncpy (buffer, result, len);
 186   buffer[len] = '\0';
 187   while (isspace (*p))
 188     ++p;
 189   free (result);
 190
 191   parse_res = _nss_files_parse_etherent (p, eth, buffer, buflen);
 192
 193   if (!parse_res)
 194     {
 195       if (errno == ERANGE)
 196         return NSS_STATUS_TRYAGAIN;
 197       else
 198         return NSS_STATUS_NOTFOUND;
 199     }
 200   else
 201     return NSS_STATUS_SUCCESS;
 202 }
 203
 204 enum nss_status
 205 _nss_nis_getetherbyaddr_r (struct ether_addr *addr, struct ether *eth,
 206                            char *buffer, size_t buflen)
 207 {
 208   enum nss_status retval;
 209   char *domain, *result, *p;
 210   int len, nlen, parse_res;
 211   char buf[33];
 212
 213   if (addr == NULL)
 214     {
 215       __set_errno (EINVAL);
 216       return NSS_STATUS_UNAVAIL;
 217     }
 218
 219   if (yp_get_default_domain (&domain))
 220     return NSS_STATUS_UNAVAIL;
 221
 222   nlen = sprintf (buf, "%x:%x:%x:%x:%x:%x",
 223                   (int) addr->ether_addr_octet[0],
 224                   (int) addr->ether_addr_octet[1],
 225                   (int) addr->ether_addr_octet[2],
 226                   (int) addr->ether_addr_octet[3],
 227                   (int) addr->ether_addr_octet[4],
 228                   (int) addr->ether_addr_octet[5]);
 229
 230   retval = yperr2nss (yp_match (domain, "ethers.byaddr", buf,
 231                                 nlen, &result, &len));
 232
 233   if (retval != NSS_STATUS_SUCCESS)
 234     {
 235       if (retval == NSS_STATUS_TRYAGAIN)
 236         __set_errno (EAGAIN);
 237       return retval;
 238     }
 239
 240   if ((size_t) (len + 1) > buflen)
 241     {
 242       free (result);
 243       __set_errno (ERANGE);
 244       return NSS_STATUS_TRYAGAIN;
 245     }
 246
 247   p = strncpy (buffer, result, len);
 248   buffer[len] = '\0';
 249   while (isspace (*p))
 250     ++p;
 251   free (result);
 252
 253   parse_res = _nss_files_parse_etherent (p, eth, buffer, buflen);
 254
 255   if (!parse_res)
 256     {
 257       if (errno == ERANGE)
 258         return NSS_STATUS_TRYAGAIN;
 259       else
 260         return NSS_STATUS_NOTFOUND;
 261     }
 262   else
 263     return NSS_STATUS_SUCCESS;
 264 }