lib/ldb/common/ldb_utf8.c

   1 /*
   2    ldb database library
   3
   4    Copyright (C) Andrew Tridgell  2004
   5
   6      ** NOTE! The following LGPL license applies to the ldb
   7      ** library. This does NOT imply that all of Samba is released
   8      ** under the LGPL
   9
  10    This library is free software; you can redistribute it and/or
  11    modify it under the terms of the GNU Lesser General Public
  12    License as published by the Free Software Foundation; either
  13    version 3 of the License, or (at your option) any later version.
  14
  15    This library is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18    Lesser General Public License for more details.
  19
  20    You should have received a copy of the GNU Lesser General Public
  21    License along with this library; if not, see <http://www.gnu.org/licenses/>.
  22 */
  23
  24 /*
  25  *  Name: ldb
  26  *
  27  *  Component: ldb utf8 handling
  28  *
  29  *  Description: case folding and case comparison for UTF8 strings
  30  *
  31  *  Author: Andrew Tridgell
  32  */
  33
  34 #include "ldb_private.h"
  35 #include "system/locale.h"
  36
  37
  38 /*
  39   this allow the user to pass in a caseless comparison
  40   function to handle utf8 caseless comparisons
  41  */
  42 void ldb_set_utf8_fns(struct ldb_context *ldb,
  43                       void *context,
  44                       char *(*casefold)(void *, void *, const char *, size_t))
  45 {
  46         if (context)
  47                 ldb->utf8_fns.context = context;
  48         if (casefold)
  49                 ldb->utf8_fns.casefold = casefold;
  50 }
  51
  52 /*
  53   a simple case folding function
  54   NOTE: does not handle UTF8
  55 */
  56 char *ldb_casefold_default(void *context, TALLOC_CTX *mem_ctx, const char *s, size_t n)
  57 {
  58         size_t i;
  59         char *ret = talloc_strndup(mem_ctx, s, n);
  60         if (!s) {
  61                 errno = ENOMEM;
  62                 return NULL;
  63         }
  64         for (i=0;ret[i];i++) {
  65                 ret[i] = toupper((unsigned char)ret[i]);
  66         }
  67         return ret;
  68 }
  69
  70 void ldb_set_utf8_default(struct ldb_context *ldb)
  71 {
  72         ldb_set_utf8_fns(ldb, NULL, ldb_casefold_default);
  73 }
  74
  75 char *ldb_casefold(struct ldb_context *ldb, TALLOC_CTX *mem_ctx, const char *s, size_t n)
  76 {
  77         return ldb->utf8_fns.casefold(ldb->utf8_fns.context, mem_ctx, s, n);
  78 }
  79
  80 /*
  81   check the attribute name is valid according to rfc2251
  82   returns 1 if the name is ok
  83  */
  84
  85 int ldb_valid_attr_name(const char *s)
  86 {
  87         size_t i;
  88
  89         if (!s || !s[0])
  90                 return 0;
  91
  92         /* handle special ldb_tdb wildcard */
  93         if (strcmp(s, "*") == 0) return 1;
  94
  95         for (i = 0; s[i]; i++) {
  96                 if (! isascii(s[i])) {
  97                         return 0;
  98                 }
  99                 if (i == 0) { /* first char must be an alpha (or our special '@' identifier) */
 100                         if (! (isalpha(s[i]) || (s[i] == '@'))) {
 101                                 return 0;
 102                         }
 103                 } else {
 104                         if (! (isalnum(s[i]) || (s[i] == '-'))) {
 105                                 return 0;
 106                         }
 107                 }
 108         }
 109         return 1;
 110 }
 111
 112 char *ldb_attr_casefold(TALLOC_CTX *mem_ctx, const char *s)
 113 {
 114         size_t i;
 115         char *ret = talloc_strdup(mem_ctx, s);
 116         if (!ret) {
 117                 errno = ENOMEM;
 118                 return NULL;
 119         }
 120         for (i = 0; ret[i]; i++) {
 121                 ret[i] = toupper((unsigned char)ret[i]);
 122         }
 123         return ret;
 124 }
 125
 126 /*
 127   we accept either 'dn' or 'distinguishedName' for a distinguishedName
 128 */
 129 int ldb_attr_dn(const char *attr)
 130 {
 131         if (ldb_attr_cmp(attr, "dn") == 0 ||
 132             ldb_attr_cmp(attr, "distinguishedName") == 0) {
 133                 return 0;
 134         }
 135         return -1;
 136 }