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/*
ldb database library
Copyright (C) Andrew Tridgell 2004
** NOTE! The following LGPL license applies to the ldb
** library. This does NOT imply that all of Samba is released
** under the LGPL
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 3 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
/*
* Name: ldb
*
* Component: ldb utf8 handling
*
* Description: case folding and case comparison for UTF8 strings
*
* Author: Andrew Tridgell
*/
#include "ldb_private.h"
#include "system/locale.h"
/*
* Set functions for comparing and case-folding case-insensitive ldb val
* strings.
*/
void ldb_set_utf8_functions(struct ldb_context *ldb,
void *context,
char *(*casefold)(void *, void *, const char *, size_t),
int (*casecmp)(void *ctx,
const struct ldb_val *v1,
const struct ldb_val *v2))
{
if (context) {
ldb->utf8_fns.context = context;
}
if (casefold) {
ldb->utf8_fns.casefold = casefold;
}
if (casecmp) {
ldb->utf8_fns.casecmp = casecmp;
}
}
/*
this allow the user to pass in a caseless comparison
function to handle utf8 caseless comparisons
*/
void ldb_set_utf8_fns(struct ldb_context *ldb,
void *context,
char *(*casefold)(void *, void *, const char *, size_t))
{
ldb_set_utf8_functions(ldb, context, casefold, NULL);
}
/*
a simple case folding function
NOTE: does not handle UTF8
*/
char *ldb_casefold_default(void *context, TALLOC_CTX *mem_ctx, const char *s, size_t n)
{
size_t i;
char *ret = talloc_strndup(mem_ctx, s, n);
if (!s) {
errno = ENOMEM;
return NULL;
}
for (i=0;ret[i];i++) {
ret[i] = ldb_ascii_toupper(ret[i]);
}
return ret;
}
/*
* The default comparison fold function only knows ASCII. Multiple
* spaces (0x20) are collapsed into one, and [a-z] map to [A-Z]. All
* other bytes are compared without casefolding.
*
* Note that as well as not handling UTF-8, this function does not exactly
* implement RFC 4518 (2.6.1. Insignificant Space Handling and Appendix B).
*/
int ldb_comparison_fold_ascii(void *ignored,
const struct ldb_val *v1,
const struct ldb_val *v2)
{
const uint8_t *s1 = v1->data;
const uint8_t *s2 = v2->data;
size_t n1 = v1->length, n2 = v2->length;
while (n1 && *s1 == ' ') { s1++; n1--; };
while (n2 && *s2 == ' ') { s2++; n2--; };
while (n1 && n2 && *s1 && *s2) {
if (ldb_ascii_toupper(*s1) != ldb_ascii_toupper(*s2)) {
break;
}
if (*s1 == ' ') {
while (n1 > 1 && s1[0] == s1[1]) { s1++; n1--; }
while (n2 > 1 && s2[0] == s2[1]) { s2++; n2--; }
}
s1++; s2++;
n1--; n2--;
}
/* check for trailing spaces only if the other pointers has
* reached the end of the strings otherwise we can
* mistakenly match. ex. "domain users" <->
* "domainUpdates"
*/
if (n1 && *s1 == ' ' && (!n2 || !*s2)) {
while (n1 && *s1 == ' ') { s1++; n1--; }
}
if (n2 && *s2 == ' ' && (!n1 || !*s1)) {
while (n2 && *s2 == ' ') { s2++; n2--; }
}
if (n1 == 0 && n2 != 0) {
return *s2 ? -1 : 0;
}
if (n2 == 0 && n1 != 0) {
return *s1 ? 1 : 0;
}
if (n1 == 0 && n2 == 0) {
return 0;
}
return NUMERIC_CMP(*s1, *s2);
}
void ldb_set_utf8_default(struct ldb_context *ldb)
{
ldb_set_utf8_functions(ldb, NULL,
ldb_casefold_default,
ldb_comparison_fold_ascii);
}
char *ldb_casefold(struct ldb_context *ldb, TALLOC_CTX *mem_ctx, const char *s, size_t n)
{
return ldb->utf8_fns.casefold(ldb->utf8_fns.context, mem_ctx, s, n);
}
/*
check the attribute name is valid according to rfc2251
returns 1 if the name is ok
*/
int ldb_valid_attr_name(const char *s)
{
size_t i;
if (!s || !s[0])
return 0;
/* handle special ldb_tdb wildcard */
if (strcmp(s, "*") == 0) return 1;
for (i = 0; s[i]; i++) {
if (! isascii(s[i])) {
return 0;
}
if (i == 0) { /* first char must be an alpha (or our special '@' identifier) */
if (! (isalpha(s[i]) || (s[i] == '@'))) {
return 0;
}
} else {
if (! (isalnum(s[i]) || (s[i] == '-'))) {
return 0;
}
}
}
return 1;
}
char *ldb_attr_casefold(TALLOC_CTX *mem_ctx, const char *s)
{
size_t i;
char *ret = talloc_strdup(mem_ctx, s);
if (!ret) {
errno = ENOMEM;
return NULL;
}
for (i = 0; ret[i]; i++) {
ret[i] = ldb_ascii_toupper(ret[i]);
}
return ret;
}
/*
we accept either 'dn' or 'distinguishedName' for a distinguishedName
*/
int ldb_attr_dn(const char *attr)
{
if (ldb_attr_cmp(attr, "dn") == 0 ||
ldb_attr_cmp(attr, "distinguishedName") == 0) {
return 0;
}
return -1;
}
_PRIVATE_ char ldb_ascii_toupper(char c) {
/*
* We are aiming for a 1970s C-locale toupper(), when all letters
* were 7-bit and behaved with true American spirit.
*
* For example, we don't want the "i" in "<guid=" to be upper-cased to
* "İ" as would happen in some locales, or we won't be able to parse
* that properly. This is unfortunate for cases where we are dealing
* with real text; a search for the name "Ali" would need to be
* written "Alİ" to match.
*/
return ('a' <= c && c <= 'z') ? c ^ 0x20 : c;
}
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