nis/nis_subr.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 <errno.h>
  21 #include <string.h>
  22 #include <rpcsvc/nis.h>
  23 #include <rpcsvc/nislib.h>
  24
  25 nis_name
  26 nis_leaf_of (const_nis_name name)
  27 {
  28   static char result[NIS_MAXNAMELEN + 1];
  29
  30   return nis_leaf_of_r (name, result, NIS_MAXNAMELEN);
  31 }
  32
  33 nis_name
  34 nis_leaf_of_r (const_nis_name name, char *buffer, size_t buflen)
  35 {
  36   size_t i = 0;
  37
  38   buffer[0] = '\0';
  39
  40   while (name[i] != '.' && name[i] != '\0')
  41     i++;
  42
  43   if (i > buflen - 1)
  44     {
  45       errno = ERANGE;
  46       return NULL;
  47     }
  48
  49   if (i > 0)
  50     {
  51       if ((size_t)i >= buflen)
  52         {
  53           errno = ERANGE;
  54           return NULL;
  55         }
  56       strncpy (buffer, name, i);
  57       buffer[i] = 0;
  58     }
  59
  60   return buffer;
  61 }
  62
  63 nis_name
  64 nis_name_of (const_nis_name name)
  65 {
  66   static char result[NIS_MAXNAMELEN + 1];
  67
  68   return nis_name_of_r (name, result, NIS_MAXNAMELEN);
  69 }
  70
  71 nis_name
  72 nis_name_of_r (const_nis_name name, char *buffer, size_t buflen)
  73 {
  74   char *local_domain;
  75   int diff;
  76
  77   local_domain = nis_local_directory ();
  78
  79   diff = strlen (name) - strlen (local_domain);
  80   if (diff <= 0)
  81     return NULL;
  82
  83   if (strcmp (&name[diff], local_domain) != 0)
  84     return NULL;
  85
  86   if ((size_t) diff >= buflen)
  87     {
  88       errno = ERANGE;
  89       return NULL;
  90     }
  91   memcpy (buffer, name, diff - 1);
  92   buffer[diff - 1] = '\0';
  93
  94   if (diff - 1 == 0)
  95     return NULL;
  96
  97   return buffer;
  98 }
  99
 100 static int
 101 count_dots (const_nis_name str)
 102 {
 103   int count = 0;
 104   size_t i;
 105
 106   for (i = 0; i < strlen (str); ++i)
 107     if (str[i] == '.')
 108       ++count;
 109
 110   return count;
 111 }
 112
 113 nis_name *
 114 nis_getnames (const_nis_name name)
 115 {
 116   nis_name *getnames = NULL;
 117   char local_domain[NIS_MAXNAMELEN + 1];
 118   char *path, *cp;
 119   int count, pos;
 120
 121
 122   strncpy (local_domain, nis_local_directory (), NIS_MAXNAMELEN);
 123   local_domain[NIS_MAXNAMELEN] = '\0';
 124
 125   count = 1;
 126   if ((getnames = malloc ((count + 1) * sizeof (char *))) == NULL)
 127       return NULL;
 128
 129   /* Do we have a fully qualified NIS+ name ? If yes, give it back */
 130   if (name[strlen (name) - 1] == '.')
 131     {
 132       if ((getnames[0] = strdup (name)) == NULL)
 133         {
 134           free (getnames);
 135           return NULL;
 136         }
 137       getnames[1] = NULL;
 138
 139       return getnames;
 140     }
 141
 142   /* Get the search path, where we have to search "name" */
 143   path = getenv ("NIS_PATH");
 144   if (path == NULL)
 145     path = strdupa ("$");
 146   else
 147     path = strdupa (path);
 148
 149   pos = 0;
 150
 151   cp = strtok (path, ":");
 152   while (cp)
 153     {
 154       if (strcmp (cp, "$") == 0)
 155         {
 156           char *cptr = local_domain;
 157           char *tmp;
 158
 159           while (count_dots (cptr) >= 2)
 160             {
 161               if (pos >= count)
 162                 {
 163                   count += 5;
 164                   getnames = realloc (getnames, (count + 1) * sizeof (char *));
 165                 }
 166               tmp = malloc (strlen (cptr) + strlen (local_domain) +
 167                             strlen (name) + 2);
 168               if (tmp == NULL)
 169                 return NULL;
 170
 171               getnames[pos] = tmp;
 172               tmp = stpcpy (tmp, name);
 173               *tmp++ = '.';
 174               stpcpy (tmp, cptr);
 175
 176               ++pos;
 177
 178               while (*cptr != '.')
 179                 ++cptr;
 180               ++cptr;
 181             }
 182         }
 183       else
 184         {
 185           char *tmp;
 186
 187           if (cp[strlen (cp) - 1] == '$')
 188             {
 189               tmp = malloc (strlen (cp) + strlen (local_domain) +
 190                             strlen (name) + 2);
 191               if (tmp == NULL)
 192                 return NULL;
 193
 194               tmp = stpcpy (tmp, name);
 195               *tmp++ = '.';
 196               tmp = stpcpy (tmp, cp);
 197               --tmp;
 198               if (tmp[-1] != '.')
 199                 *tmp++ = '.';
 200               stpcpy (tmp, local_domain);
 201             }
 202           else
 203             {
 204               tmp = malloc (strlen (cp) + strlen (name) + 2);
 205               if (tmp == NULL)
 206                 return NULL;
 207
 208               tmp = stpcpy (tmp, name);
 209               *tmp++ = '.';
 210               stpcpy (tmp, cp);
 211             }
 212
 213           if (pos > count)
 214             {
 215               count += 5;
 216               getnames = realloc (getnames, (count + 1) * sizeof (char *));
 217               if (getnames == NULL)
 218                 return NULL;
 219             }
 220           getnames[pos] = tmp;
 221           ++pos;
 222         }
 223       cp = strtok (NULL, ":");
 224     }
 225
 226   getnames[pos] = NULL;
 227
 228   return getnames;
 229 }
 230
 231 void
 232 nis_freenames (nis_name *names)
 233 {
 234   int i = 0;
 235
 236   while (names[i] != NULL)
 237     {
 238       free (names[i]);
 239       ++i;
 240     }
 241
 242   free (names);
 243 }
 244
 245 name_pos
 246 nis_dir_cmp (const_nis_name n1, const_nis_name n2)
 247 {
 248   int len1, len2;
 249
 250   len1 = strlen (n1);
 251   len2 = strlen (n2);
 252
 253   if (len1 == len2)
 254     {
 255       if (strcmp (n1, n2) == 0)
 256         return SAME_NAME;
 257       else
 258         return NOT_SEQUENTIAL;
 259     }
 260
 261   if (len1 < len2)
 262     {
 263       if (n2[len2 - len1 - 1] != '.')
 264         return NOT_SEQUENTIAL;
 265       else if (strcmp (&n2[len2 - len1], n1) == 0)
 266         return HIGHER_NAME;
 267       else
 268         return NOT_SEQUENTIAL;
 269     }
 270   else
 271     {
 272       if (n1[len1 - len2 - 1] != '.')
 273         return NOT_SEQUENTIAL;
 274       else if (strcmp (&n1[len1 - len2], n2) == 0)
 275         return LOWER_NAME;
 276       else
 277         return NOT_SEQUENTIAL;
 278
 279     }
 280 }
 281
 282 void
 283 nis_destroy_object (nis_object *obj)
 284 {
 285   nis_free_object (obj);
 286 }