nis/nis_subr.c

   1 /* Copyright (c) 1997-2013 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 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, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <errno.h>
  20 #include <string.h>
  21 #include <rpcsvc/nis.h>
  22
  23 nis_name
  24 nis_leaf_of (const_nis_name name)
  25 {
  26   static char result[NIS_MAXNAMELEN + 1];
  27
  28   return nis_leaf_of_r (name, result, NIS_MAXNAMELEN);
  29 }
  30
  31 nis_name
  32 nis_leaf_of_r (const_nis_name name, char *buffer, size_t buflen)
  33 {
  34   size_t i = 0;
  35
  36   buffer[0] = '\0';
  37
  38   while (name[i] != '.' && name[i] != '\0')
  39     i++;
  40
  41   if (__builtin_expect (i >= buflen, 0))
  42     {
  43       __set_errno (ERANGE);
  44       return NULL;
  45     }
  46
  47   *((char *) __mempcpy (buffer, name, i)) = '\0';
  48
  49   return buffer;
  50 }
  51 libnsl_hidden_def (nis_leaf_of_r)
  52
  53 nis_name
  54 nis_name_of (const_nis_name name)
  55 {
  56   static char result[NIS_MAXNAMELEN + 1];
  57
  58   return nis_name_of_r (name, result, NIS_MAXNAMELEN);
  59 }
  60
  61 nis_name
  62 nis_name_of_r (const_nis_name name, char *buffer, size_t buflen)
  63 {
  64   char *local_domain;
  65   int diff;
  66
  67   local_domain = nis_local_directory ();
  68
  69   diff = strlen (name) - strlen (local_domain);
  70   if (diff <= 0)
  71     return NULL;
  72
  73   if (strcmp (&name[diff], local_domain) != 0)
  74     return NULL;
  75
  76   if ((size_t) diff >= buflen)
  77     {
  78       __set_errno (ERANGE);
  79       return NULL;
  80     }
  81
  82   *((char *) __mempcpy (buffer, name, diff - 1)) = '\0';
  83
  84   if (diff - 1 == 0)
  85     return NULL;
  86
  87   return buffer;
  88 }
  89 libnsl_hidden_def (nis_name_of_r)
  90
  91 static int __always_inline
  92 count_dots (const_nis_name str)
  93 {
  94   int count = 0;
  95
  96   for (size_t i = 0; str[i] != '\0'; ++i)
  97     if (str[i] == '.')
  98       ++count;
  99
 100   return count;
 101 }
 102
 103 /* If we run out of memory, we don't give already allocated memory
 104    free. The overhead for bringing getnames back in a safe state to
 105    free it is to big. */
 106 nis_name *
 107 nis_getnames (const_nis_name name)
 108 {
 109   const char *local_domain = nis_local_directory ();
 110   size_t local_domain_len = strlen (local_domain);
 111   size_t name_len = strlen (name);
 112   char *path;
 113   int pos = 0;
 114   char *saveptr = NULL;
 115   int have_point;
 116   const char *cp;
 117   const char *cp2;
 118
 119   int count = 2;
 120   nis_name *getnames = malloc ((count + 1) * sizeof (char *));
 121   if (__builtin_expect (getnames == NULL, 0))
 122       return NULL;
 123
 124   /* Do we have a fully qualified NIS+ name ? If yes, give it back */
 125   if (name[name_len - 1] == '.')
 126     {
 127       if ((getnames[0] = strdup (name)) == NULL)
 128         {
 129         free_null:
 130           while (pos-- > 0)
 131             free (getnames[pos]);
 132           free (getnames);
 133           return NULL;
 134         }
 135
 136       getnames[1] = NULL;
 137
 138       return getnames;
 139     }
 140
 141   /* If the passed NAME is shared a suffix (the latter of course with
 142      a final dot) with each other we pass back NAME with a final
 143      dot.  */
 144   if (local_domain_len > 2)
 145     {
 146       have_point = 0;
 147       cp = &local_domain[local_domain_len - 2];
 148       cp2 = &name[name_len - 1];
 149
 150       while (*cp == *cp2)
 151         {
 152           if (*cp == '.')
 153             have_point = 1;
 154           --cp;
 155           --cp2;
 156           if (cp < local_domain)
 157             {
 158               have_point = cp2 < name || *cp2 == '.';
 159               break;
 160             }
 161           if (cp2 < name)
 162             {
 163               have_point = *cp == '.';
 164               break;
 165             }
 166         }
 167
 168       if (have_point)
 169         {
 170           getnames[0] = malloc (name_len + 2);
 171           if (getnames[0] == NULL)
 172             goto free_null;
 173
 174           strcpy (stpcpy (getnames[0], name), ".");
 175           ++pos;
 176         }
 177     }
 178
 179   /* Get the search path, where we have to search "name" */
 180   path = getenv ("NIS_PATH");
 181   if (path == NULL)
 182     path = strdupa ("$");
 183   else
 184     path = strdupa (path);
 185
 186   have_point = strchr (name, '.') != NULL;
 187
 188   cp = __strtok_r (path, ":", &saveptr);
 189   while (cp)
 190     {
 191       if (strcmp (cp, "$") == 0)
 192         {
 193           const char *cptr = local_domain;
 194           char *tmp;
 195
 196           while (*cptr != '\0' && count_dots (cptr) >= 2)
 197             {
 198               if (pos >= count)
 199                 {
 200                   count += 5;
 201                   nis_name *newp = realloc (getnames,
 202                                             (count + 1) * sizeof (char *));
 203                   if (__builtin_expect (newp == NULL, 0))
 204                     goto free_null;
 205                   getnames = newp;
 206                 }
 207               tmp = malloc (strlen (cptr) + local_domain_len + name_len + 2);
 208               if (__builtin_expect (tmp == NULL, 0))
 209                 goto free_null;
 210
 211               getnames[pos] = tmp;
 212               tmp = stpcpy (tmp, name);
 213               *tmp++ = '.';
 214               if (cptr[1] != '\0')
 215                 stpcpy (tmp, cptr);
 216               else
 217                 ++cptr;
 218
 219               ++pos;
 220
 221               while (*cptr != '.' && *cptr != '\0')
 222                 ++cptr;
 223               if (cptr[0] != '\0' && cptr[1] != '\0')
 224                 /* If we have only ".", don't remove the "." */
 225                 ++cptr;
 226             }
 227         }
 228       else
 229         {
 230           char *tmp;
 231           size_t cplen = strlen (cp);
 232
 233           if (cp[cplen - 1] == '$')
 234             {
 235               char *p;
 236
 237               tmp = malloc (cplen + local_domain_len + name_len + 2);
 238               if (__builtin_expect (tmp == NULL, 0))
 239                 goto free_null;
 240
 241               p = __stpcpy (tmp, name);
 242               *p++ = '.';
 243               p = __mempcpy (p, cp, cplen);
 244               --p;
 245               if (p[-1] != '.')
 246                 *p++ = '.';
 247               __stpcpy (p, local_domain);
 248             }
 249           else
 250             {
 251               char *p;
 252
 253               tmp = malloc (cplen + name_len + 3);
 254               if (__builtin_expect (tmp == NULL, 0))
 255                 goto free_null;
 256
 257               p = __mempcpy (tmp, name, name_len);
 258               *p++ = '.';
 259               p = __mempcpy (p, cp, cplen);
 260               if (p[-1] != '.')
 261                 *p++ = '.';
 262               *p = '\0';
 263             }
 264
 265           if (pos >= count)
 266             {
 267               count += 5;
 268               nis_name *newp = realloc (getnames,
 269                                         (count + 1) * sizeof (char *));
 270               if (__builtin_expect (newp == NULL, 0))
 271                 goto free_null;
 272               getnames = newp;
 273             }
 274           getnames[pos] = tmp;
 275           ++pos;
 276         }
 277       cp = __strtok_r (NULL, ":", &saveptr);
 278     }
 279
 280   if (pos == 0
 281       && __asprintf (&getnames[pos++], "%s%s%s%s",
 282                      name, name[name_len - 1] == '.' ? "" : ".",
 283                      local_domain,
 284                      local_domain[local_domain_len - 1] == '.' ? "" : ".") < 0)
 285     goto free_null;
 286
 287   getnames[pos] = NULL;
 288
 289   return getnames;
 290 }
 291 libnsl_hidden_def (nis_getnames)
 292
 293 void
 294 nis_freenames (nis_name *names)
 295 {
 296   int i = 0;
 297
 298   while (names[i] != NULL)
 299     {
 300       free (names[i]);
 301       ++i;
 302     }
 303
 304   free (names);
 305 }
 306 libnsl_hidden_def  (nis_freenames)
 307
 308 name_pos
 309 nis_dir_cmp (const_nis_name n1, const_nis_name n2)
 310 {
 311   int len1, len2;
 312
 313   len1 = strlen (n1);
 314   len2 = strlen (n2);
 315
 316   if (len1 == len2)
 317     {
 318       if (strcmp (n1, n2) == 0)
 319         return SAME_NAME;
 320       else
 321         return NOT_SEQUENTIAL;
 322     }
 323
 324   if (len1 < len2)
 325     {
 326       if (n2[len2 - len1 - 1] != '.')
 327         return NOT_SEQUENTIAL;
 328       else if (strcmp (&n2[len2 - len1], n1) == 0)
 329         return HIGHER_NAME;
 330       else
 331         return NOT_SEQUENTIAL;
 332     }
 333   else
 334     {
 335       if (n1[len1 - len2 - 1] != '.')
 336         return NOT_SEQUENTIAL;
 337       else if (strcmp (&n1[len1 - len2], n2) == 0)
 338         return LOWER_NAME;
 339       else
 340         return NOT_SEQUENTIAL;
 341
 342     }
 343 }
 344 libnsl_hidden_def (nis_dir_cmp)
 345
 346 void
 347 nis_destroy_object (nis_object *obj)
 348 {
 349   nis_free_object (obj);
 350 }
 351 libnsl_hidden_def (nis_destroy_object)