nis/nss_nisplus/nisplus-service.c

   1 /* Copyright (C) 1997, 1998, 1999, 2001, 2002 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Thorsten Kukuk <kukuk@suse.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 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 #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;
  33 static nis_name tablename_val;
  34 static u_long tablename_len;
  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, int *errnop)
  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       *errnop = 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 = htons (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++ = '\0';
 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 (int *errnop)
 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         {
 158           *errnop = errno;
 159           return NSS_STATUS_TRYAGAIN;
 160         }
 161       tablename_len = strlen (tablename_val);
 162     }
 163   return NSS_STATUS_SUCCESS;
 164 }
 165
 166
 167 enum nss_status
 168 _nss_nisplus_setservent (int stayopen)
 169 {
 170   enum nss_status status = NSS_STATUS_SUCCESS;
 171   int err;
 172
 173   __libc_lock_lock (lock);
 174
 175   if (result)
 176     nis_freeresult (result);
 177   result = NULL;
 178
 179   if (tablename_val == NULL)
 180     status = _nss_create_tablename (&err);
 181
 182   __libc_lock_unlock (lock);
 183
 184   return status;
 185 }
 186
 187 enum nss_status
 188 _nss_nisplus_endservent (void)
 189 {
 190   __libc_lock_lock (lock);
 191
 192   if (result)
 193     nis_freeresult (result);
 194   result = NULL;
 195
 196   __libc_lock_unlock (lock);
 197
 198   return NSS_STATUS_SUCCESS;
 199 }
 200
 201 static enum nss_status
 202 internal_nisplus_getservent_r (struct servent *serv, char *buffer,
 203                                size_t buflen, int *errnop)
 204 {
 205   int parse_res;
 206
 207   /* Get the next entry until we found a correct one. */
 208   do
 209     {
 210       nis_result *saved_res;
 211
 212       if (result == NULL)
 213         {
 214           saved_res = NULL;
 215           if (tablename_val == NULL)
 216             {
 217               enum nss_status status = _nss_create_tablename (errnop);
 218
 219               if (status != NSS_STATUS_SUCCESS)
 220                 return status;
 221             }
 222
 223           result = nis_first_entry (tablename_val);
 224           if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
 225             return niserr2nss (result->status);
 226         }
 227       else
 228         {
 229           nis_result *res;
 230
 231           saved_res = result;
 232           res = nis_next_entry (tablename_val, &result->cookie);
 233           result = res;
 234           if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
 235             {
 236               nis_freeresult (saved_res);
 237               return niserr2nss (result->status);
 238             }
 239         }
 240
 241       parse_res = _nss_nisplus_parse_servent (result, serv, buffer,
 242                                               buflen, errnop);
 243       if (parse_res == -1)
 244         {
 245           nis_freeresult (result);
 246           result = saved_res;
 247           *errnop = ERANGE;
 248           return NSS_STATUS_TRYAGAIN;
 249         }
 250       else
 251         {
 252           if (saved_res)
 253             nis_freeresult (saved_res);
 254         }
 255     }
 256   while (!parse_res);
 257
 258   return NSS_STATUS_SUCCESS;
 259 }
 260
 261 enum nss_status
 262 _nss_nisplus_getservent_r (struct servent *result, char *buffer,
 263                            size_t buflen, int *errnop)
 264 {
 265   int status;
 266
 267   __libc_lock_lock (lock);
 268
 269   status = internal_nisplus_getservent_r (result, buffer, buflen, errnop);
 270
 271   __libc_lock_unlock (lock);
 272
 273   return status;
 274 }
 275
 276 enum nss_status
 277 _nss_nisplus_getservbyname_r (const char *name, const char *protocol,
 278                               struct servent *serv,
 279                               char *buffer, size_t buflen, int *errnop)
 280 {
 281   int parse_res;
 282
 283   if (tablename_val == NULL)
 284     {
 285       enum nss_status status = _nss_create_tablename (errnop);
 286
 287       if (status != NSS_STATUS_SUCCESS)
 288         return status;
 289     }
 290
 291   if (name == NULL || protocol == NULL)
 292     {
 293       *errnop = EINVAL;
 294       return NSS_STATUS_NOTFOUND;
 295     }
 296   else
 297     {
 298       nis_result *result;
 299       char buf[strlen (name) + 255 + tablename_len];
 300       int olderr = errno;
 301
 302       /* Search at first in the alias list, and use the correct name
 303          for the next search */
 304       sprintf (buf, "[name=%s,proto=%s],%s", name, protocol,
 305                tablename_val);
 306       result = nis_list (buf, FOLLOW_PATH | FOLLOW_LINKS, NULL, NULL);
 307
 308       /* If we do not find it, try it as original name. But if the
 309          database is correct, we should find it in the first case, too */
 310       if ((result->status != NIS_SUCCESS && result->status != NIS_S_SUCCESS)
 311           || __type_of (result->objects.objects_val) != NIS_ENTRY_OBJ
 312           || strcmp (result->objects.objects_val->EN_data.en_type,
 313                      "services_tbl") != 0
 314           || result->objects.objects_val->EN_data.en_cols.en_cols_len < 4)
 315         sprintf (buf, "[cname=%s,proto=%s],%s", name, protocol,
 316                  tablename_val);
 317       else
 318         sprintf (buf, "[cname=%s,proto=%s],%s",
 319                  NISENTRYVAL (0, 0, result), protocol, tablename_val);
 320
 321       nis_freeresult (result);
 322       result = nis_list (buf, FOLLOW_PATH | FOLLOW_LINKS, NULL, NULL);
 323
 324       if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
 325         {
 326           enum nss_status status = niserr2nss (result->status);
 327
 328           __set_errno (olderr);
 329
 330           nis_freeresult (result);
 331           return status;
 332         }
 333
 334       parse_res = _nss_nisplus_parse_servent (result, serv, buffer, buflen,
 335                                               errnop);
 336       nis_freeresult (result);
 337
 338       if (parse_res < 1)
 339         {
 340           if (parse_res == -1)
 341             {
 342               *errnop = ERANGE;
 343               return NSS_STATUS_TRYAGAIN;
 344             }
 345           else
 346             {
 347               __set_errno (olderr);
 348               return NSS_STATUS_NOTFOUND;
 349             }
 350         }
 351       return NSS_STATUS_SUCCESS;
 352     }
 353 }
 354
 355 enum nss_status
 356 _nss_nisplus_getservbyport_r (const int number, const char *protocol,
 357                               struct servent *serv,
 358                               char *buffer, size_t buflen, int *errnop)
 359 {
 360   if (tablename_val == NULL)
 361     {
 362       enum nss_status status = _nss_create_tablename (errnop);
 363
 364       if (status != NSS_STATUS_SUCCESS)
 365         return status;
 366     }
 367
 368   if (protocol == NULL)
 369     {
 370       *errnop = EINVAL;
 371       return NSS_STATUS_NOTFOUND;
 372     }
 373   else
 374     {
 375       int parse_res;
 376       nis_result *result;
 377       char buf[60 + strlen (protocol) + tablename_len];
 378       int olderr = errno;
 379
 380       sprintf (buf, "[port=%d,proto=%s],%s",
 381                number, protocol, tablename_val);
 382
 383       result = nis_list (buf, FOLLOW_PATH | FOLLOW_LINKS, NULL, NULL);
 384
 385       if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
 386         {
 387           enum nss_status status = niserr2nss (result->status);
 388
 389           __set_errno (olderr);
 390
 391           nis_freeresult (result);
 392           return status;
 393         }
 394
 395       parse_res = _nss_nisplus_parse_servent (result, serv, buffer, buflen,
 396                                               errnop);
 397       nis_freeresult (result);
 398
 399       if (parse_res < 1)
 400         {
 401           if (parse_res == -1)
 402             {
 403               *errnop = ERANGE;
 404               return NSS_STATUS_TRYAGAIN;
 405             }
 406           else
 407             {
 408               __set_errno (olderr);
 409               return NSS_STATUS_NOTFOUND;
 410             }
 411         }
 412       return NSS_STATUS_SUCCESS;
 413     }
 414 }