nis/nss_nisplus/nisplus-service.c

   1 /* Copyright (C) 1997 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Thorsten Kukuk <kukuk@vt.uni-paderborn.de>, 1997.
   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 <errno.h>
  22 #include <ctype.h>
  23 #include <netdb.h>
  24 #include <string.h>
  25 #include <libc-lock.h>
  26 #include <rpcsvc/nis.h>
  27 #include <rpcsvc/nislib.h>
  28
  29 #include "nss-nisplus.h"
  30
  31 __libc_lock_define_initialized (static, lock);
  32
  33 static nis_result *result = NULL;
  34 static nis_name *names = NULL;
  35
  36 #define ENTNAME         servent
  37 #define DATABASE        "services"
  38 #define TRAILING_LIST_MEMBER            s_aliases
  39 #define TRAILING_LIST_SEPARATOR_P       isspace
  40 #include "../../nss/nss_files/files-parse.c"
  41 #define ISSLASH(c) ((c) == '/')
  42 LINE_PARSER
  43 ("#",
  44  STRING_FIELD (result->s_name, isspace, 1);
  45  INT_FIELD (result->s_port, ISSLASH, 10, 0, htons);
  46  STRING_FIELD (result->s_proto, isspace, 1);
  47  )
  48
  49
  50 #define NISENTRYVAL(idx,col,res) \
  51   ((res)->objects.objects_val[(idx)].zo_data.objdata_u.en_data.en_cols.en_cols_val[(col)].ec_value.ec_value_val)
  52
  53 #define NISENTRYLEN(idx,col,res) \
  54     ((res)->objects.objects_val[(idx)].zo_data.objdata_u.en_data.en_cols.en_cols_val[(col)].ec_value.ec_value_len)
  55
  56 static int
  57 _nss_nisplus_parse_servent (nis_result *result, struct servent *serv,
  58                             char *buffer, size_t buflen)
  59 {
  60   char *p = buffer;
  61   size_t room_left = buflen;
  62   unsigned int i;
  63   struct parser_data *data = (void *) buffer;
  64
  65   if (result == NULL)
  66     return 0;
  67
  68   if ((result->status != NIS_SUCCESS && result->status != NIS_S_SUCCESS) ||
  69       result->objects.objects_val[0].zo_data.zo_type != ENTRY_OBJ ||
  70    strcmp (result->objects.objects_val[0].zo_data.objdata_u.en_data.en_type,
  71            "services_tbl") != 0 ||
  72       result->objects.objects_val[0].zo_data.objdata_u.en_data.en_cols.en_cols_len < 4)
  73     return 0;
  74
  75   memset (p, '\0', room_left);
  76
  77   /* Generate the services entry format and use the normal parser */
  78   if (NISENTRYLEN (0, 0, result) + 1 > room_left)
  79     {
  80       __set_errno (ERANGE);
  81       return 0;
  82     }
  83   strncpy (p, NISENTRYVAL (0, 0, result), NISENTRYLEN (0, 0, result));
  84   room_left -= (NISENTRYLEN (0, 0, result) + 1);
  85
  86   if (NISENTRYLEN (0, 3, result) + 1 > room_left)
  87     {
  88       __set_errno (ERANGE);
  89       return 0;
  90     }
  91   strcat (p, "\t");
  92   strncat (p, NISENTRYVAL (0, 3, result), NISENTRYLEN (0, 3, result));
  93   room_left -= (NISENTRYLEN (0, 3, result) + 1);
  94   if (NISENTRYLEN (0, 2, result) + 1 > room_left)
  95     {
  96       __set_errno (ERANGE);
  97       return 0;
  98     }
  99   strcat (p, "/");
 100   strncat (p, NISENTRYVAL (0, 2, result), NISENTRYLEN (0, 2, result));
 101   room_left -= (NISENTRYLEN (0, 2, result) + 1);
 102
 103   for (i = 1; i < result->objects.objects_len; i++)
 104     {
 105       if (NISENTRYLEN (i, 1, result) + 1 > room_left)
 106         {
 107           __set_errno (ERANGE);
 108           return 0;
 109         }
 110       strcat (p, " ");
 111       strcat (p, NISENTRYVAL (i, 1, result));
 112       room_left -= (NISENTRYLEN (i, 1, result) + 1);
 113     }
 114
 115   return _nss_files_parse_servent (p, serv, data, buflen);
 116 }
 117
 118 enum nss_status
 119 _nss_nisplus_setservent (void)
 120 {
 121   __libc_lock_lock (lock);
 122
 123   if (result)
 124     nis_freeresult (result);
 125   result = NULL;
 126   if (names)
 127     {
 128       nis_freenames (names);
 129       names = NULL;
 130     }
 131
 132   __libc_lock_unlock (lock);
 133
 134   return NSS_STATUS_SUCCESS;
 135 }
 136
 137 enum nss_status
 138 _nss_nisplus_endservent (void)
 139 {
 140   __libc_lock_lock (lock);
 141
 142   if (result)
 143     nis_freeresult (result);
 144   result = NULL;
 145   if (names)
 146     {
 147       nis_freenames (names);
 148       names = NULL;
 149     }
 150
 151   __libc_lock_unlock (lock);
 152
 153   return NSS_STATUS_SUCCESS;
 154 }
 155
 156 static enum nss_status
 157 internal_nisplus_getservent_r (struct servent *serv, char *buffer,
 158                                size_t buflen)
 159 {
 160   int parse_res;
 161
 162   /* Get the next entry until we found a correct one. */
 163   do
 164     {
 165       if (result == NULL)
 166         {
 167           names = nis_getnames ("services.org_dir");
 168           if (names == NULL || names[0] == NULL)
 169             return NSS_STATUS_UNAVAIL;
 170
 171           result = nis_first_entry (names[0]);
 172           if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
 173             return niserr2nss (result->status);
 174         }
 175       else
 176         {
 177           nis_result *res;
 178
 179           res = nis_next_entry (names[0], &result->cookie);
 180           nis_freeresult (result);
 181           result = res;
 182           if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
 183             return niserr2nss (result->status);
 184         }
 185
 186       parse_res = _nss_nisplus_parse_servent (result, serv, buffer, buflen);
 187     }
 188   while (!parse_res);
 189
 190   return NSS_STATUS_SUCCESS;
 191 }
 192
 193 enum nss_status
 194 _nss_nisplus_getservent_r (struct servent *result, char *buffer,
 195                            size_t buflen)
 196 {
 197   int status;
 198
 199   __libc_lock_lock (lock);
 200
 201   status = internal_nisplus_getservent_r (result, buffer, buflen);
 202
 203   __libc_lock_unlock (lock);
 204
 205   return status;
 206 }
 207
 208 enum nss_status
 209 _nss_nisplus_getservbyname_r (const char *name, const char *protocol,
 210                               struct servent *serv,
 211                               char *buffer, size_t buflen)
 212 {
 213   int parse_res;
 214
 215   if (name == NULL || protocol == NULL)
 216     {
 217       __set_errno (EINVAL);
 218       return NSS_STATUS_NOTFOUND;
 219     }
 220   else
 221     {
 222       nis_result *result;
 223       char buf[strlen (name) + 255];
 224
 225       /* Search at first in the alias list, and use the correct name
 226          for the next search */
 227       sprintf (buf, "[name=%s,proto=%s],services.org_dir", name,
 228                protocol);
 229       result = nis_list (buf, EXPAND_NAME, NULL, NULL);
 230
 231       /* If we do not find it, try it as original name. But if the
 232          database is correct, we should find it in the first case, too */
 233       if ((result->status != NIS_SUCCESS &&
 234            result->status != NIS_S_SUCCESS) ||
 235           result->objects.objects_val[0].zo_data.zo_type != ENTRY_OBJ ||
 236           strcmp (result->objects.objects_val[0].zo_data.objdata_u.en_data.en_type,
 237                   "services_tbl") != 0 ||
 238           result->objects.objects_val[0].zo_data.objdata_u.en_data.en_cols.en_cols_len < 4)
 239         sprintf (buf, "[cname=%s,proto=%s],services.org_dir", name, protocol);
 240       else
 241         sprintf (buf, "[cname=%s,proto=%s],services.org_dir",
 242                  NISENTRYVAL (0, 0, result), protocol);
 243
 244       nis_freeresult (result);
 245       result = nis_list (buf, EXPAND_NAME, NULL, NULL);
 246
 247       if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
 248         {
 249           enum nss_status status = niserr2nss (result->status);
 250
 251           nis_freeresult (result);
 252           return status;
 253         }
 254
 255       parse_res = _nss_nisplus_parse_servent (result, serv, buffer, buflen);
 256
 257       nis_freeresult (result);
 258
 259       if (parse_res)
 260         return NSS_STATUS_SUCCESS;
 261
 262       if (!parse_res && errno == ERANGE)
 263         return NSS_STATUS_TRYAGAIN;
 264       else
 265         return NSS_STATUS_NOTFOUND;
 266     }
 267 }
 268
 269 enum nss_status
 270 _nss_nisplus_getservbynumber_r (const int number, const char *protocol,
 271                                 struct servent *serv,
 272                                 char *buffer, size_t buflen)
 273 {
 274   int parse_res;
 275   nis_result *result;
 276   char buf[60 + strlen (protocol)];
 277
 278   if (protocol == NULL)
 279     {
 280       __set_errno (EINVAL);
 281       return NSS_STATUS_NOTFOUND;
 282     }
 283
 284   snprintf (buf, sizeof (buf), "[number=%d,proto=%s],services.org_dir",
 285             number, protocol);
 286
 287   result = nis_list (buf, EXPAND_NAME, NULL, NULL);
 288
 289   if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
 290     {
 291       enum nss_status status = niserr2nss (result->status);
 292
 293       nis_freeresult (result);
 294       return status;
 295     }
 296
 297   parse_res = _nss_nisplus_parse_servent (result, serv, buffer, buflen);
 298
 299   nis_freeresult (result);
 300
 301   if (parse_res)
 302     return NSS_STATUS_SUCCESS;
 303
 304   if (!parse_res && errno == ERANGE)
 305     return NSS_STATUS_TRYAGAIN;
 306   else
 307     return NSS_STATUS_NOTFOUND;
 308 }