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 <bits/libc-lock.h>
  26 #include <rpcsvc/nis.h>
  27
  28 #include "nss-nisplus.h"
  29
  30 __libc_lock_define_initialized (static, lock);
  31
  32 static nis_result *result = NULL;
  33 static nis_name tablename_val = NULL;
  34 static u_long tablename_len = 0;
  35
  36 #define NISENTRYVAL(idx,col,res) \
  37   ((res)->objects.objects_val[(idx)].EN_data.en_cols.en_cols_val[(col)].ec_value.ec_value_val)
  38
  39 #define NISENTRYLEN(idx,col,res) \
  40     ((res)->objects.objects_val[(idx)].EN_data.en_cols.en_cols_val[(col)].ec_value.ec_value_len)
  41
  42 static int
  43 _nss_nisplus_parse_servent (nis_result *result, struct servent *serv,
  44                             char *buffer, size_t buflen)
  45 {
  46   char *first_unused = buffer;
  47   size_t room_left = buflen;
  48   unsigned int i;
  49   char *p, *line;
  50
  51   if (result == NULL)
  52     return 0;
  53
  54   if ((result->status != NIS_SUCCESS && result->status != NIS_S_SUCCESS) ||
  55       __type_of (result->objects.objects_val) != NIS_ENTRY_OBJ ||
  56       strcmp (result->objects.objects_val->EN_data.en_type,
  57               "services_tbl") != 0 ||
  58       result->objects.objects_val->EN_data.en_cols.en_cols_len < 4)
  59     return 0;
  60
  61   if (NISENTRYLEN (0, 0, result) >= room_left)
  62     {
  63     no_more_room:
  64       __set_errno (ERANGE);
  65       return -1;
  66     }
  67   strncpy (first_unused, NISENTRYVAL (0, 0, result),
  68            NISENTRYLEN (0, 0, result));
  69   first_unused[NISENTRYLEN (0, 0, result)] = '\0';
  70   serv->s_name = first_unused;
  71   room_left -= (strlen (first_unused) +1);
  72   first_unused += strlen (first_unused) +1;
  73
  74   if (NISENTRYLEN (0, 2, result) >= room_left)
  75     goto no_more_room;
  76   strncpy (first_unused, NISENTRYVAL (0, 2, result),
  77            NISENTRYLEN (0, 2, result));
  78   first_unused[NISENTRYLEN (0, 2, result)] = '\0';
  79   serv->s_proto = first_unused;
  80   room_left -= (strlen (first_unused) +1);
  81   first_unused += strlen (first_unused) +1;
  82
  83   serv->s_port = atoi (NISENTRYVAL (0, 3, result));
  84   p = first_unused;
  85
  86   line = p;
  87   for (i = 0; i < result->objects.objects_len; i++)
  88     {
  89       if (strcmp (NISENTRYVAL (i, 1, result), serv->s_name) != 0)
  90         {
  91           if (NISENTRYLEN (i, 1, result) + 2 > room_left)
  92             goto no_more_room;
  93           *p++ = ' ';
  94           p = __stpncpy (p, NISENTRYVAL (i, 1, result),
  95                          NISENTRYLEN (i, 1, result));
  96           *p = '\0';
  97           room_left -= (NISENTRYLEN (i, 1, result) + 1);
  98         }
  99     }
 100   ++p;
 101   first_unused = p;
 102
 103   /* Adjust the pointer so it is aligned for
 104      storing pointers.  */
 105   first_unused += __alignof__ (char *) - 1;
 106   first_unused -= ((first_unused - (char *) 0) % __alignof__ (char *));
 107   serv->s_aliases = (char **) first_unused;
 108   if (room_left < sizeof (char *))
 109     goto no_more_room;
 110   room_left -= (sizeof (char *));
 111   serv->s_aliases[0] = NULL;
 112
 113   i = 0;
 114   while (*line != '\0')
 115     {
 116       /* Skip leading blanks.  */
 117       while (isspace (*line))
 118         line++;
 119
 120       if (*line == '\0')
 121         break;
 122
 123       if (room_left < sizeof (char *))
 124         goto no_more_room;
 125
 126       room_left -= sizeof (char *);
 127       serv->s_aliases[i] = line;
 128
 129       while (*line != '\0' && *line != ' ')
 130         ++line;
 131
 132       if (*line == ' ')
 133         {
 134           *line = '\0';
 135           ++line;
 136           ++i;
 137         }
 138       else
 139         serv->s_aliases[i+1] = NULL;
 140     }
 141
 142   return 1;
 143 }
 144
 145 static enum nss_status
 146 _nss_create_tablename (void)
 147 {
 148   if (tablename_val == NULL)
 149     {
 150       char buf [40 + strlen (nis_local_directory ())];
 151       char *p;
 152
 153       p = __stpcpy (buf, "services.org_dir.");
 154       p = __stpcpy (p, nis_local_directory ());
 155       tablename_val = __strdup (buf);
 156       if (tablename_val == NULL)
 157         return NSS_STATUS_TRYAGAIN;
 158       tablename_len = strlen (tablename_val);
 159     }
 160   return NSS_STATUS_SUCCESS;
 161 }
 162
 163
 164 enum nss_status
 165 _nss_nisplus_setservent (void)
 166 {
 167   enum nss_status status = NSS_STATUS_SUCCESS;
 168
 169   __libc_lock_lock (lock);
 170
 171   if (result)
 172     nis_freeresult (result);
 173   result = NULL;
 174
 175   if (tablename_val == NULL)
 176     status = _nss_create_tablename ();
 177
 178   __libc_lock_unlock (lock);
 179
 180   return status;
 181 }
 182
 183 enum nss_status
 184 _nss_nisplus_endservent (void)
 185 {
 186   __libc_lock_lock (lock);
 187
 188   if (result)
 189     nis_freeresult (result);
 190   result = NULL;
 191
 192   __libc_lock_unlock (lock);
 193
 194   return NSS_STATUS_SUCCESS;
 195 }
 196
 197 static enum nss_status
 198 internal_nisplus_getservent_r (struct servent *serv, char *buffer,
 199                                size_t buflen)
 200 {
 201   int parse_res;
 202
 203   /* Get the next entry until we found a correct one. */
 204   do
 205     {
 206       nis_result *saved_res;
 207
 208       if (result == NULL)
 209         {
 210           saved_res = NULL;
 211           if (tablename_val == NULL)
 212             if (_nss_create_tablename () != NSS_STATUS_SUCCESS)
 213               return NSS_STATUS_UNAVAIL;
 214
 215           result = nis_first_entry (tablename_val);
 216           if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
 217             return niserr2nss (result->status);
 218         }
 219       else
 220         {
 221           nis_result *res;
 222
 223           saved_res = result;
 224           res = nis_next_entry (tablename_val, &result->cookie);
 225           result = res;
 226           if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
 227             {
 228               nis_freeresult (saved_res);
 229               return niserr2nss (result->status);
 230             }
 231         }
 232
 233       if ((parse_res = _nss_nisplus_parse_servent (result, serv, buffer,
 234                                                    buflen)) == -1)
 235         {
 236           nis_freeresult (result);
 237           result = saved_res;
 238           return NSS_STATUS_TRYAGAIN;
 239         }
 240       else
 241         {
 242           if (saved_res)
 243             nis_freeresult (saved_res);
 244         }
 245     }
 246   while (!parse_res);
 247
 248   return NSS_STATUS_SUCCESS;
 249 }
 250
 251 enum nss_status
 252 _nss_nisplus_getservent_r (struct servent *result, char *buffer,
 253                            size_t buflen)
 254 {
 255   int status;
 256
 257   __libc_lock_lock (lock);
 258
 259   status = internal_nisplus_getservent_r (result, buffer, buflen);
 260
 261   __libc_lock_unlock (lock);
 262
 263   return status;
 264 }
 265
 266 enum nss_status
 267 _nss_nisplus_getservbyname_r (const char *name, const char *protocol,
 268                               struct servent *serv,
 269                               char *buffer, size_t buflen)
 270 {
 271   int parse_res;
 272
 273   if (tablename_val == NULL)
 274     if (_nss_create_tablename () != NSS_STATUS_SUCCESS)
 275       return NSS_STATUS_UNAVAIL;
 276
 277   if (name == NULL || protocol == NULL)
 278     {
 279       __set_errno (EINVAL);
 280       return NSS_STATUS_NOTFOUND;
 281     }
 282   else
 283     {
 284       nis_result *result;
 285       char buf[strlen (name) + 255 + tablename_len];
 286
 287       /* Search at first in the alias list, and use the correct name
 288          for the next search */
 289       sprintf (buf, "[name=%s,proto=%s],%s", name, protocol,
 290                tablename_val);
 291       result = nis_list (buf, FOLLOW_PATH | FOLLOW_LINKS, NULL, NULL);
 292
 293       /* If we do not find it, try it as original name. But if the
 294          database is correct, we should find it in the first case, too */
 295       if ((result->status != NIS_SUCCESS &&
 296            result->status != NIS_S_SUCCESS) ||
 297           __type_of (result->objects.objects_val) != NIS_ENTRY_OBJ ||
 298           strcmp (result->objects.objects_val->EN_data.en_type,
 299                   "services_tbl") != 0 ||
 300           result->objects.objects_val->EN_data.en_cols.en_cols_len < 4)
 301         sprintf (buf, "[cname=%s,proto=%s],%s", name, protocol,
 302                  tablename_val);
 303       else
 304         sprintf (buf, "[cname=%s,proto=%s],%s",
 305                  NISENTRYVAL (0, 0, result), protocol, tablename_val);
 306
 307       nis_freeresult (result);
 308       result = nis_list (buf, FOLLOW_PATH | FOLLOW_LINKS, NULL, NULL);
 309
 310       if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
 311         {
 312           enum nss_status status = niserr2nss (result->status);
 313
 314           nis_freeresult (result);
 315           return status;
 316         }
 317
 318       parse_res = _nss_nisplus_parse_servent (result, serv, buffer, buflen);
 319       nis_freeresult (result);
 320
 321       if (parse_res == -1)
 322         return NSS_STATUS_TRYAGAIN;
 323
 324       if (parse_res)
 325         return NSS_STATUS_SUCCESS;
 326
 327       return NSS_STATUS_NOTFOUND;
 328     }
 329 }
 330
 331 enum nss_status
 332 _nss_nisplus_getservbynumber_r (const int number, const char *protocol,
 333                                 struct servent *serv,
 334                                 char *buffer, size_t buflen)
 335 {
 336   if (tablename_val == NULL)
 337     if (_nss_create_tablename () != NSS_STATUS_SUCCESS)
 338       return NSS_STATUS_UNAVAIL;
 339
 340   if (protocol == NULL)
 341     {
 342       __set_errno (EINVAL);
 343       return NSS_STATUS_NOTFOUND;
 344     }
 345   else
 346     {
 347       int parse_res;
 348       nis_result *result;
 349       char buf[60 + strlen (protocol) + tablename_len];
 350
 351       sprintf (buf, "[number=%d,proto=%s],%s",
 352                number, protocol, tablename_val);
 353
 354       result = nis_list (buf, FOLLOW_PATH | FOLLOW_LINKS, NULL, NULL);
 355
 356       if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
 357         {
 358           enum nss_status status = niserr2nss (result->status);
 359
 360           nis_freeresult (result);
 361           return status;
 362         }
 363
 364       parse_res = _nss_nisplus_parse_servent (result, serv, buffer, buflen);
 365       nis_freeresult (result);
 366
 367       if (parse_res == -1)
 368         return NSS_STATUS_TRYAGAIN;
 369
 370       if (parse_res)
 371         return NSS_STATUS_SUCCESS;
 372
 373       return NSS_STATUS_NOTFOUND;
 374     }
 375 }