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Diffstat (limited to 'source4/lib/ldb/common/ldb_dn.c')
-rw-r--r--source4/lib/ldb/common/ldb_dn.c471
1 files changed, 471 insertions, 0 deletions
diff --git a/source4/lib/ldb/common/ldb_dn.c b/source4/lib/ldb/common/ldb_dn.c
new file mode 100644
index 0000000000..7ae314e46c
--- /dev/null
+++ b/source4/lib/ldb/common/ldb_dn.c
@@ -0,0 +1,471 @@
+/*
+ ldb database library
+
+ Copyright (C) Simo Sorce 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 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_RETURN(x) do { if (!x) return NULL; } while(0)
+
+static char *escape_string(void *mem_ctx, const char *src)
+{
+ const char *p, *s;
+ char *d, *dst;
+
+ LDB_DN_NULL_RETURN(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_RETURN(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;
+}
+
+static char *unescape_string(void *mem_ctx, const char *src)
+{
+ unsigned x;
+ char *p, *dst, *end;
+
+ LDB_DN_NULL_RETURN(src);
+
+ dst = p = talloc_strdup(mem_ctx, src);
+ LDB_DN_NULL_RETURN(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;
+}
+
+static char *seek_to_separator(char *string, const char *separator)
+{
+ char *p;
+
+ p = strchr(string, '=');
+
+ LDB_DN_NULL_RETURN(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_RETURN(p);
+
+ if (*(p - 1) == '\\')
+ p++;
+ }
+ }
+
+ p += strcspn(p, separator);
+
+ return p;
+}
+
+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_RETURN(at);
+
+ p = strchr(raw_attribute, '=');
+
+ LDB_DN_NULL_RETURN(p);
+
+ *p = '\0';
+
+ at->name = talloc_strdup(at, ldb_dn_trim_string(raw_attribute, " \n"));
+ LDB_DN_NULL_RETURN(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_RETURN(at->value);
+
+ return at;
+}
+
+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_RETURN(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_RETURN(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_RETURN(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_RETURN(dc->attributes[dc->attr_num]);
+
+ dc->attr_num++;
+
+ /* jump to the next attribute if any */
+ p = t;
+
+ } while(*p);
+
+ return dc;
+}
+
+/* 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_RETURN(edn);
+
+ /* Initially there are no components */
+ edn->comp_num = 0;
+ edn->components = NULL;
+
+ pdn = p = talloc_strdup(edn, dn);
+ if (!pdn)
+ goto error;
+
+ /* 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 error;
+
+ 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 error;
+
+ /* 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 error;
+
+ 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;
+
+error:
+ talloc_free(edn);
+ return NULL;
+}
+
+char *ldb_dn_linearize(void *mem_ctx, struct ldb_dn *edn)
+{
+ char *dn, *format, *ename, *evalue;
+ int i, j;
+
+ dn = talloc_strdup(mem_ctx, "");
+ LDB_DN_NULL_RETURN(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 (i != 0 && j == 0)
+ format = ",%s=%s";
+ else if (i == 0 && j == 0)
+ format = "%s=%s";
+ else
+ format = "+%s=%s";
+
+ ename = escape_string(mem_ctx, edn->components[i]->attributes[j]->name);
+ LDB_DN_NULL_RETURN(ename);
+
+ evalue = escape_string(mem_ctx, edn->components[i]->attributes[j]->value);
+ LDB_DN_NULL_RETURN(evalue);
+
+ dn = talloc_asprintf_append(dn, format, ename, evalue);
+ LDB_DN_NULL_RETURN(dn);
+
+ talloc_free(ename);
+ talloc_free(evalue);
+ }
+ }
+
+ return dn;
+}
+
+/* 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;
+ }
+ }
+}
+
+/*
+ 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(void *mem_ctx, struct ldb_dn *edn, void *user_data,
+ int (* case_fold_attr_fn)(void * user_data, char * attr))
+{
+ struct ldb_dn *cedn;
+ int i, j;
+
+ cedn = talloc(mem_ctx, struct ldb_dn);
+ LDB_DN_NULL_RETURN(cedn);
+
+ cedn->comp_num = edn->comp_num;
+ cedn->components = talloc_array(cedn, struct ldb_dn_component *, edn->comp_num);
+ LDB_DN_NULL_RETURN(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_RETURN(dc);
+
+ dc->attr_num = edn->components[i]->attr_num;
+ dc->attributes = edn->components[i]->attributes;
+ LDB_DN_NULL_RETURN(dc->attributes);
+
+ for (j = 0; j < edn->components[i]->attr_num; j++) {
+ struct ldb_dn_attribute *at;
+
+ at = talloc(dc->attributes, struct ldb_dn_attribute);
+ LDB_DN_NULL_RETURN(at);
+
+ at->name = ldb_casefold(at, edn->components[i]->attributes[j]->name);
+ LDB_DN_NULL_RETURN(at->name);
+
+ if (case_fold_attr_fn(user_data, at->name)) {
+ at->value = ldb_casefold(at, edn->components[i]->attributes[j]->value);
+ } else {
+ at->value = talloc_strdup(at, edn->components[i]->attributes[j]->value);
+ }
+ LDB_DN_NULL_RETURN(at->value);
+
+ dc->attributes[j] = at;
+ }
+
+ cedn->components[i] = dc;
+ }
+
+ return cedn;
+}
+
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