nis/nss_nis/nis-rpc.c

   1 /* Copyright (C) 1996, 1997, 1998, 2000, 2002 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Thorsten Kukuk <kukuk@suse.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 #include <netdb.h>
  22 #include <ctype.h>
  23 #include <errno.h>
  24 #include <string.h>
  25 #include <bits/libc-lock.h>
  26 #include <rpcsvc/yp.h>
  27 #include <rpcsvc/ypclnt.h>
  28
  29 #include "nss-nis.h"
  30
  31 /* Get the declaration of the parser function.  */
  32 #define ENTNAME rpcent
  33 #define EXTERN_PARSER
  34 #include <nss/nss_files/files-parse.c>
  35
  36 __libc_lock_define_initialized (static, lock)
  37
  38 struct response_t
  39 {
  40   char *val;
  41   struct response_t *next;
  42 };
  43
  44 struct intern_t
  45 {
  46   struct response_t *start;
  47   struct response_t *next;
  48 };
  49 typedef struct intern_t intern_t;
  50
  51 static intern_t intern = {NULL, NULL};
  52
  53 static int
  54 saveit (int instatus, char *inkey, int inkeylen, char *inval,
  55         int invallen, char *indata)
  56 {
  57   intern_t *intern = (intern_t *)indata;
  58
  59   if (instatus != YP_TRUE)
  60     return instatus;
  61
  62   if (inkey && inkeylen > 0 && inval && invallen > 0)
  63     {
  64       if (intern->start == NULL)
  65         {
  66           intern->start = malloc (sizeof (struct response_t));
  67           if (intern->start == NULL)
  68             return YP_FALSE;
  69           intern->next = intern->start;
  70         }
  71       else
  72         {
  73           intern->next->next = malloc (sizeof (struct response_t));
  74           if (intern->next->next == NULL)
  75             return YP_FALSE;
  76           intern->next = intern->next->next;
  77         }
  78       intern->next->next = NULL;
  79       intern->next->val = malloc (invallen + 1);
  80       if (intern->next->val == NULL)
  81         return YP_FALSE;
  82       strncpy (intern->next->val, inval, invallen);
  83       intern->next->val[invallen] = '\0';
  84     }
  85
  86   return 0;
  87 }
  88
  89 static enum nss_status
  90 internal_nis_setrpcent (intern_t *intern)
  91 {
  92   char *domainname;
  93   struct ypall_callback ypcb;
  94   enum nss_status status;
  95
  96   if (yp_get_default_domain (&domainname))
  97     return NSS_STATUS_UNAVAIL;
  98
  99   while (intern->start != NULL)
 100     {
 101       if (intern->start->val != NULL)
 102         free (intern->start->val);
 103       intern->next = intern->start;
 104       intern->start = intern->start->next;
 105       free (intern->next);
 106     }
 107   intern->start = NULL;
 108
 109   ypcb.foreach = saveit;
 110   ypcb.data = (char *)intern;
 111   status = yperr2nss (yp_all(domainname, "rpc.bynumber", &ypcb));
 112   intern->next = intern->start;
 113
 114   return status;
 115 }
 116
 117 enum nss_status
 118 _nss_nis_setrpcent (int stayopen)
 119 {
 120   enum nss_status status;
 121
 122   __libc_lock_lock (lock);
 123
 124   status = internal_nis_setrpcent (&intern);
 125
 126   __libc_lock_unlock (lock);
 127
 128   return status;
 129 }
 130
 131 static enum nss_status
 132 internal_nis_endrpcent (intern_t *intern)
 133 {
 134   while (intern->start != NULL)
 135     {
 136       if (intern->start->val != NULL)
 137         free (intern->start->val);
 138       intern->next = intern->start;
 139       intern->start = intern->start->next;
 140       free (intern->next);
 141     }
 142   intern->start = NULL;
 143
 144   return NSS_STATUS_SUCCESS;
 145 }
 146
 147 enum nss_status
 148 _nss_nis_endrpcent (void)
 149 {
 150   enum nss_status status;
 151
 152   __libc_lock_lock (lock);
 153
 154   status = internal_nis_endrpcent (&intern);
 155
 156   __libc_lock_unlock (lock);
 157
 158   return status;
 159 }
 160
 161 static enum nss_status
 162 internal_nis_getrpcent_r (struct rpcent *rpc, char *buffer, size_t buflen,
 163                           int *errnop, intern_t *data)
 164 {
 165   struct parser_data *pdata = (void *) buffer;
 166   int parse_res;
 167   char *p;
 168
 169   if (data->start == NULL)
 170     internal_nis_setrpcent (data);
 171
 172   /* Get the next entry until we found a correct one. */
 173   do
 174     {
 175       if (data->next == NULL)
 176         return NSS_STATUS_NOTFOUND;
 177
 178       p = strncpy (buffer, data->next->val, buflen);
 179       while (isspace (*p))
 180         ++p;
 181
 182       parse_res = _nss_files_parse_rpcent (p, rpc, pdata, buflen, errnop);
 183       if (parse_res == -1)
 184         return NSS_STATUS_TRYAGAIN;
 185       data->next = data->next->next;
 186     }
 187   while (!parse_res);
 188
 189   return NSS_STATUS_SUCCESS;
 190 }
 191
 192 enum nss_status
 193 _nss_nis_getrpcent_r (struct rpcent *rpc, char *buffer, size_t buflen,
 194                       int *errnop)
 195 {
 196   enum nss_status status;
 197
 198   __libc_lock_lock (lock);
 199
 200   status = internal_nis_getrpcent_r (rpc, buffer, buflen, errnop, &intern);
 201
 202   __libc_lock_unlock (lock);
 203
 204   return status;
 205 }
 206
 207 enum nss_status
 208 _nss_nis_getrpcbyname_r (const char *name, struct rpcent *rpc,
 209                          char *buffer, size_t buflen, int *errnop)
 210 {
 211   intern_t data = {NULL, NULL};
 212   enum nss_status status;
 213   int found;
 214
 215   if (name == NULL)
 216     {
 217       *errnop = EINVAL;
 218       return NSS_STATUS_UNAVAIL;
 219     }
 220
 221   status = internal_nis_setrpcent (&data);
 222   if (status != NSS_STATUS_SUCCESS)
 223     return status;
 224
 225   found = 0;
 226   while (!found &&
 227          ((status = internal_nis_getrpcent_r (rpc, buffer, buflen, errnop,
 228                                               &data)) == NSS_STATUS_SUCCESS))
 229     {
 230       if (strcmp (rpc->r_name, name) == 0)
 231         found = 1;
 232       else
 233         {
 234           int i = 0;
 235
 236           while (rpc->r_aliases[i] != NULL)
 237             {
 238               if (strcmp (rpc->r_aliases[i], name) == 0)
 239                 {
 240                   found = 1;
 241                   break;
 242                 }
 243               else
 244                 ++i;
 245             }
 246         }
 247     }
 248
 249   internal_nis_endrpcent (&data);
 250
 251   if (!found && status == NSS_STATUS_SUCCESS)
 252     return NSS_STATUS_NOTFOUND;
 253   else
 254     return status;
 255 }
 256
 257 enum nss_status
 258 _nss_nis_getrpcbynumber_r (int number, struct rpcent *rpc,
 259                            char *buffer, size_t buflen, int *errnop)
 260 {
 261   struct parser_data *data = (void *) buffer;
 262   enum nss_status retval;
 263   char *domain, *result, *p;
 264   int len, nlen, parse_res;
 265   char buf[32];
 266
 267   if (yp_get_default_domain (&domain))
 268     return NSS_STATUS_UNAVAIL;
 269
 270   nlen = sprintf (buf, "%d", number);
 271
 272   retval = yperr2nss (yp_match (domain, "rpc.bynumber", buf,
 273                                  nlen, &result, &len));
 274
 275   if (retval != NSS_STATUS_SUCCESS)
 276     {
 277       if (retval == NSS_STATUS_TRYAGAIN)
 278         *errnop = errno;
 279       return retval;
 280     }
 281
 282   if ((size_t) (len + 1) > buflen)
 283     {
 284       free (result);
 285       *errnop = ERANGE;
 286       return NSS_STATUS_TRYAGAIN;
 287     }
 288
 289   p = strncpy (buffer, result, len);
 290   buffer[len] = '\0';
 291   while (isspace (*p))
 292     ++p;
 293   free (result);
 294
 295   parse_res = _nss_files_parse_rpcent (p, rpc, data, buflen, errnop);
 296
 297   if (parse_res < 1)
 298     {
 299       if (parse_res == -1)
 300         return NSS_STATUS_TRYAGAIN;
 301       else
 302         return NSS_STATUS_NOTFOUND;
 303     }
 304   else
 305     return NSS_STATUS_SUCCESS;
 306 }