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/*
ldb database library
Copyright (C) Simo Sorce 2005
** 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 2 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, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
* Name: ldb
*
* Component: ldb dn explode and utility functions
*
* Description: - explode a dn into it's own basic elements
* and put them in a structure
* - manipulate ldb_dn structures
*
* Author: Simo Sorce
*/
#include "includes.h"
#include "ldb/include/ldb.h"
#include "ldb/include/ldb_private.h"
#include "ldb/include/ldb_dn.h"
#define LDB_DN_NULL_FAILED(x) if (!(x)) goto failed
static char *escape_string(void *mem_ctx, const char *src)
{
const char *p, *s;
char *d, *dst=NULL;
LDB_DN_NULL_FAILED(src);
/* allocate destination string, it will be at most 3 times the source */
dst = d = talloc_array(mem_ctx, char, strlen(src) * 3 + 1);
LDB_DN_NULL_FAILED(dst);
p = s = src;
while (*p) {
p += strcspn(p, ",=\n+<>#;\\\"");
if (*p == '\0') /* no special s found, all ok */
break;
if (*p) { /* copy part of the string and escape */
memcpy(d, s, p - s);
d += (p - s);
*d++ = '\\';
*d++ = *p++;
s = p;
}
}
/* copy the last part (with zero) and return */
memcpy(d, s, &src[strlen(src)] - s + 1);
return dst;
failed:
talloc_free(dst);
return NULL;
}
static char *unescape_string(void *mem_ctx, const char *src)
{
unsigned x;
char *p, *dst=NULL, *end;
LDB_DN_NULL_FAILED(src);
dst = p = talloc_strdup(mem_ctx, src);
LDB_DN_NULL_FAILED(dst);
end = &dst[strlen(dst)];
while (*p) {
p += strcspn(p, ",=\n+<>#;\\\"");
if (*p == '\0') /* no escapes or specials found, all ok */
return dst;
if (*p == '\\') {
if (strchr(",=\n+<>#;\\\"", p[1])) {
memmove(p, p + 1, end - (p + 1) + 1);
end--;
p++;
continue;
}
if (sscanf(p + 1, "%02x", &x) == 1) {
*p = (unsigned char)x;
memmove(p + 1, p + 3, end - (p + 3) + 1);
end -= 2;
p++;
continue;
}
}
/* a string with not escaped specials is invalid */
return NULL;
}
return dst;
failed:
talloc_free(dst);
return NULL;
}
static char *seek_to_separator(char *string, const char *separator)
{
char *p;
p = strchr(string, '=');
LDB_DN_NULL_FAILED(p);
p++;
/* check if there are quotes surrounding the value */
p += strspn(p, " \n"); /* skip white spaces after '=' */
if (*p == '\"') {
p++;
while (*p != '\"') {
p = strchr(p, '\"');
LDB_DN_NULL_FAILED(p);
if (*(p - 1) == '\\')
p++;
}
}
p += strcspn(p, separator);
return p;
failed:
return NULL;
}
static char *ldb_dn_trim_string(char *string, const char *edge)
{
char *s, *p;
/* seek out edge from start of string */
s = string + strspn(string, edge);
/* backwards skip from end of string */
p = &s[strlen(s) - 1];
while (p > s && strchr(edge, *p)) {
*p = '\0';
p--;
}
return s;
}
static struct ldb_dn_attribute *ldb_dn_explode_attribute(void *mem_ctx, char *raw_attribute)
{
struct ldb_dn_attribute *at;
char *p;
at = talloc(mem_ctx, struct ldb_dn_attribute);
LDB_DN_NULL_FAILED(at);
p = strchr(raw_attribute, '=');
LDB_DN_NULL_FAILED(p);
*p = '\0';
at->name = talloc_strdup(at, ldb_dn_trim_string(raw_attribute, " \n"));
LDB_DN_NULL_FAILED(at->name);
p++;
p = ldb_dn_trim_string(p, " \n");
if (*p == '\"') { /* quotes at start means there must be quotes at the end */
if (p[strlen(p) - 1] != '\"') /* malformed value */
return NULL;
p++;
p[strlen(p) - 1] = '\0';
at->value = talloc_strdup(at, p);
return at;
}
/* no quotes means we must unescape the string */
at->value = unescape_string(at, p);
LDB_DN_NULL_FAILED(at->value);
return at;
failed:
talloc_free(at);
return NULL;
}
static struct ldb_dn_component *explode_component(void *mem_ctx, char *raw_component)
{
struct ldb_dn_component *dc;
char *p;
dc = talloc(mem_ctx, struct ldb_dn_component);
LDB_DN_NULL_FAILED(dc);
dc->attr_num = 0;
dc->attributes = NULL;
p = raw_component;
/* get the components */
do {
char *t;
/* terminate the current attribute and return pointer to the next one */
t = seek_to_separator(p, "+");
LDB_DN_NULL_FAILED(t);
if (*t) { /* here there is a separator */
*t = '\0'; /*terminate */
t++; /* a separtor means there's another attribute that follows */
}
/* allocate attributes pointer */
dc->attributes = talloc_realloc(dc, dc->attributes,
struct ldb_dn_attribute *,
dc->attr_num + 1);
LDB_DN_NULL_FAILED(dc->attributes);
/* store the exploded attirbute in the main structure */
dc->attributes[dc->attr_num] = ldb_dn_explode_attribute(dc->attributes, p);
LDB_DN_NULL_FAILED(dc->attributes[dc->attr_num]);
dc->attr_num++;
/* jump to the next attribute if any */
p = t;
} while(*p);
return dc;
failed:
talloc_free(dc);
return NULL;
}
/* FIXME: currently consider a dn composed of only case insensitive attributes
this is not correct and need to be fixed soon */
static void ldb_dn_sort_attributes(struct ldb_dn *edn)
{
struct ldb_dn_attribute *at0, *at1;
int i, j, k, l;
for (i = 0; i < edn->comp_num; i++) {
if (edn->components[i]->attr_num > 1) {
/* it is very unlikely that there is a multivalued RDN. In that
unlikely case it is very unlikely you will find more than 2
values. So the use of bubble sort here seem to be acceptable */
for (j = 0; (j + 1) < edn->components[i]->attr_num; j++) {
for (k = j; k >= 0; k--) {
at0 = edn->components[i]->attributes[k];
at1 = edn->components[i]->attributes[k + 1];
l = ldb_caseless_cmp(at0->name, at1->name);
if (l > 0) {
/* already sorted, so no bubbles to move exit inner loop */
break;
}
if (l == 0) {
if (ldb_caseless_cmp(at0->value, at1->value) >= 0) {
/* already sorted, so no bubbles to move exit inner loop */
break;
}
}
edn->components[i]->attributes[k] = at1;
edn->components[i]->attributes[k + 1] = at0;
}
}
}
}
}
struct ldb_dn *ldb_dn_explode(void *mem_ctx, const char *dn)
{
struct ldb_dn *edn; /* the exploded dn */
char *pdn, *p;
/* Allocate a structure to hold the exploded DN */
edn = talloc(mem_ctx, struct ldb_dn);
LDB_DN_NULL_FAILED(edn);
/* Initially there are no components */
edn->comp_num = 0;
edn->components = NULL;
pdn = p = talloc_strdup(edn, dn);
if (!pdn)
goto failed;
/* get the components */
do {
char *t;
/* terminate the current component and return pointer to the next one */
t = seek_to_separator(p, ",;");
if (t == NULL)
goto failed;
if (*t) { /* here there is a separator */
*t = '\0'; /*terminate */
t++; /* a separtor means there's another component that follows */
}
/* allocate space to hold the dn component */
edn->components = talloc_realloc(edn, edn->components,
struct ldb_dn_component *,
edn->comp_num + 1);
if (edn->components == NULL)
goto failed;
/* store the exploded component in the main structure */
edn->components[edn->comp_num] = explode_component(edn->components, p);
if (edn->components[edn->comp_num] == NULL)
goto failed;
edn->comp_num++;
/* jump to the next component if any */
p = t;
} while(*p);
/* sort attributes if there's any multivalued component */
ldb_dn_sort_attributes(edn);
talloc_free(pdn);
return edn;
failed:
talloc_free(edn);
return NULL;
}
char *ldb_dn_linearize(void *mem_ctx, struct ldb_dn *edn)
{
char *dn, *ename, *evalue;
const char *format;
int i, j;
dn = talloc_strdup(mem_ctx, "");
LDB_DN_NULL_FAILED(dn);
for (i = 0; i < edn->comp_num; i++) {
if (i != 0) {
dn = talloc_append_string(mem_ctx, dn, ",");
}
for (j = 0; j < edn->components[i]->attr_num; j++) {
if (j == 0) {
format = "%s=%s";
} else {
format = "+%s=%s";
}
ename = escape_string(dn, edn->components[i]->attributes[j]->name);
LDB_DN_NULL_FAILED(ename);
evalue = escape_string(dn, edn->components[i]->attributes[j]->value);
LDB_DN_NULL_FAILED(evalue);
dn = talloc_asprintf_append(dn, format, ename, evalue);
LDB_DN_NULL_FAILED(dn);
talloc_free(ename);
talloc_free(evalue);
}
}
return dn;
failed:
talloc_free(dn);
return NULL;
}
/* FIXME: currently consider a dn composed of only case insensitive attributes
this is not correct and need to be fixed soon */
int ldb_dn_compare(struct ldb_dn *edn0, struct ldb_dn *edn1)
{
struct ldb_dn_attribute *at0, *at1;
int i, j, k;
/* if the number of components doesn't match they differ */
if (edn0->comp_num != edn1->comp_num)
return (edn1->comp_num - edn0->comp_num);
for (i = 0; i < edn0->comp_num; i++) {
/* if the number of attributes per component doesn't match they differ */
if (edn0->components[i]->attr_num != edn1->components[i]->attr_num)
return (edn1->components[i]->attr_num - edn0->components[i]->attr_num);
for (j = 0; j < edn0->components[i]->attr_num; j++) {
at0 = edn0->components[i]->attributes[j];
at1 = edn1->components[i]->attributes[j];
/* compare names */
k = ldb_caseless_cmp(at0->name, at1->name);
if (k)
return k;
/* names match, compare values */
k = ldb_caseless_cmp(at0->value, at1->value);
if (k)
return k;
}
}
return 0;
}
/*
casefold a dn. We need to uppercase the attribute names, and the
attribute values of case insensitive attributes. We also need to remove
extraneous spaces between elements
*/
struct ldb_dn *ldb_dn_casefold(struct ldb_context *ldb, struct ldb_dn *edn)
{
struct ldb_dn *cedn;
int i, j;
cedn = talloc(ldb, struct ldb_dn);
LDB_DN_NULL_FAILED(cedn);
cedn->comp_num = edn->comp_num;
cedn->components = talloc_array(cedn, struct ldb_dn_component *, edn->comp_num);
LDB_DN_NULL_FAILED(cedn->components);
for (i = 0; i < edn->comp_num; i++) {
struct ldb_dn_component *dc;
dc = talloc(cedn->components, struct ldb_dn_component);
LDB_DN_NULL_FAILED(dc);
dc->attr_num = edn->components[i]->attr_num;
dc->attributes = edn->components[i]->attributes;
LDB_DN_NULL_FAILED(dc->attributes);
for (j = 0; j < edn->components[i]->attr_num; j++) {
struct ldb_dn_attribute *at;
struct ldb_val v0, v;
const struct ldb_attrib_handler *h;
at = talloc(dc->attributes, struct ldb_dn_attribute);
LDB_DN_NULL_FAILED(at);
at->name = ldb_casefold(at, edn->components[i]->attributes[j]->name);
LDB_DN_NULL_FAILED(at->name);
h = ldb_attrib_handler(ldb, at->name);
/* at->value should be a ldb_val, work around
this for now .... */
v0.data = edn->components[i]->attributes[j]->value;
v0.length = strlen(v0.data);
if (h->canonicalise_fn(ldb, &v0, &v) != 0) {
return NULL;
}
talloc_steal(at, v.data);
at->value = v.data;
dc->attributes[j] = at;
}
cedn->components[i] = dc;
}
return cedn;
failed:
talloc_free(cedn);
return NULL;
}
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