source/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 2 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, write to the Free Software
  22    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  23 */
  24
  25 /*
  26  *  Name: ldb
  27  *
  28  *  Component: ldb utf8 handling
  29  *
  30  *  Description: case folding and case comparison for UTF8 strings
  31  *
  32  *  Author: Andrew Tridgell
  33  */
  34
  35 #include "includes.h"
  36 #include "ldb/include/includes.h"
  37 #include "system/locale.h"
  38
  39
  40 /*
  41   this allow the user to pass in a caseless comparison
  42   function to handle utf8 caseless comparisons
  43  */
  44 void ldb_set_utf8_fns(struct ldb_context *ldb,
  45                         void *context,
  46                         char *(*casefold)(void *, void *, const char *))
  47 {
  48         if (context)
  49                 ldb->utf8_fns.context = context;
  50         if (casefold)
  51                 ldb->utf8_fns.casefold = casefold;
  52 }
  53
  54 /*
  55   a simple case folding function
  56   NOTE: does not handle UTF8
  57 */
  58 char *ldb_casefold_default(void *context, void *mem_ctx, const char *s)
  59 {
  60         int i;
  61         char *ret = talloc_strdup(mem_ctx, s);
  62         if (!s) {
  63                 errno = ENOMEM;
  64                 return NULL;
  65         }
  66         for (i=0;ret[i];i++) {
  67                 ret[i] = toupper((unsigned char)ret[i]);
  68         }
  69         return ret;
  70 }
  71
  72 void ldb_set_utf8_default(struct ldb_context *ldb)
  73 {
  74         ldb_set_utf8_fns(ldb, NULL, ldb_casefold_default);
  75 }
  76
  77 char *ldb_casefold(struct ldb_context *ldb, void *mem_ctx, const char *s)
  78 {
  79         return ldb->utf8_fns.casefold(ldb->utf8_fns.context, mem_ctx, s);
  80 }
  81
  82 /*
  83   check the attribute name is valid according to rfc2251
  84   returns 1 if the name is ok
  85  */
  86
  87 int ldb_valid_attr_name(const char *s)
  88 {
  89         int i;
  90
  91         if (!s || !s[0])
  92                 return 0;
  93
  94         /* handle special ldb_tdb wildcard */
  95         if (strcmp(s, "*") == 0) return 1;
  96
  97         for (i = 0; s[i]; i++) {
  98                 if (! isascii(s[i])) {
  99                         return 0;
 100                 }
 101                 if (i == 0) { /* first char must be an alpha (or our special '@' identifier) */
 102                         if (! (isalpha(s[i]) || (s[i] == '@'))) {
 103                                 return 0;
 104                         }
 105                 } else {
 106                         if (! (isalnum(s[i]) || (s[i] == '-'))) {
 107                                 return 0;
 108                         }
 109                 }
 110         }
 111         return 1;
 112 }
 113
 114 /*
 115   compare two attribute names
 116   attribute names are restricted by rfc2251 so using
 117   strcasecmp and toupper here is ok.
 118   return 0 for match
 119 */
 120 int ldb_attr_cmp(const char *attr1, const char *attr2)
 121 {
 122         return strcasecmp(attr1, attr2);
 123 }
 124
 125 char *ldb_attr_casefold(void *mem_ctx, const char *s)
 126 {
 127         int i;
 128         char *ret = talloc_strdup(mem_ctx, s);
 129         if (!ret) {
 130                 errno = ENOMEM;
 131                 return NULL;
 132         }
 133         for (i = 0; ret[i]; i++) {
 134                 ret[i] = toupper((unsigned char)ret[i]);
 135         }
 136         return ret;
 137 }
 138
 139 /*
 140   we accept either 'dn' or 'distinguishedName' for a distinguishedName
 141 */
 142 int ldb_attr_dn(const char *attr)
 143 {
 144         if (ldb_attr_cmp(attr, "dn") == 0 ||
 145             ldb_attr_cmp(attr, "distinguishedName") == 0) {
 146                 return 0;
 147         }
 148         return -1;
 149 }