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/*
ldb database library
Copyright (C) Andrew Bartlett 2007
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/*
* Name: ldb
*
* Component: ldb ranged results module
*
* Description: munge AD-style 'ranged results' requests into
* requests for all values in an attribute, then return the range to
* the client.
*
* Author: Andrew Bartlett
*/
#include "includes.h"
#include "ldb_module.h"
struct rr_context {
struct ldb_module *module;
struct ldb_request *req;
};
static struct rr_context *rr_init_context(struct ldb_module *module,
struct ldb_request *req)
{
struct rr_context *ac;
ac = talloc_zero(req, struct rr_context);
if (ac == NULL) {
ldb_set_errstring(ldb_module_get_ctx(module), "Out of Memory");
return NULL;
}
ac->module = module;
ac->req = req;
return ac;
}
static int rr_search_callback(struct ldb_request *req, struct ldb_reply *ares)
{
struct ldb_context *ldb;
struct rr_context *ac;
unsigned int i, j;
TALLOC_CTX *temp_ctx;
ac = talloc_get_type(req->context, struct rr_context);
ldb = ldb_module_get_ctx(ac->module);
if (!ares) {
return ldb_module_done(ac->req, NULL, NULL,
LDB_ERR_OPERATIONS_ERROR);
}
if (ares->error != LDB_SUCCESS) {
return ldb_module_done(ac->req, ares->controls,
ares->response, ares->error);
}
if (ares->type == LDB_REPLY_REFERRAL) {
return ldb_module_send_referral(ac->req, ares->referral);
}
if (ares->type == LDB_REPLY_DONE) {
return ldb_module_done(ac->req, ares->controls,
ares->response, ares->error);
}
/* LDB_REPLY_ENTRY */
temp_ctx = talloc_new(ac->req);
if (!temp_ctx) {
ldb_module_oom(ac->module);
return ldb_module_done(ac->req, NULL, NULL,
LDB_ERR_OPERATIONS_ERROR);
}
/* Find those that are range requests from the attribute list */
for (i = 0; ac->req->op.search.attrs[i]; i++) {
char *p, *new_attr;
const char *end_str;
unsigned int start, end, orig_num_values;
struct ldb_message_element *el;
struct ldb_val *orig_values;
p = strchr(ac->req->op.search.attrs[i], ';');
if (!p) {
continue;
}
if (strncasecmp(p, ";range=", strlen(";range=")) != 0) {
continue;
}
if (sscanf(p, ";range=%u-%u", &start, &end) != 2) {
if (sscanf(p, ";range=%u-*", &start) == 1) {
end = (unsigned int)-1;
} else {
continue;
}
}
new_attr = talloc_strndup(temp_ctx,
ac->req->op.search.attrs[i],
(size_t)(p - ac->req->op.search.attrs[i]));
if (!new_attr) {
ldb_oom(ldb);
return ldb_module_done(ac->req, NULL, NULL,
LDB_ERR_OPERATIONS_ERROR);
}
el = ldb_msg_find_element(ares->message, new_attr);
talloc_free(new_attr);
if (!el) {
continue;
}
if (end >= (el->num_values - 1)) {
/* Need to leave the requested attribute in
* there (so add an empty one to match) */
end_str = "*";
end = el->num_values - 1;
} else {
end_str = talloc_asprintf(temp_ctx, "%u", end);
if (!end_str) {
ldb_oom(ldb);
return ldb_module_done(ac->req, NULL, NULL,
LDB_ERR_OPERATIONS_ERROR);
}
}
/* If start is greater then where we are find the end to be */
if (start > end) {
el->num_values = 0;
el->values = NULL;
} else {
orig_values = el->values;
orig_num_values = el->num_values;
if ((start + end < start) || (start + end < end)) {
ldb_asprintf_errstring(ldb,
"range request error: start or end would overflow!");
return ldb_module_done(ac->req, NULL, NULL,
LDB_ERR_UNWILLING_TO_PERFORM);
}
el->num_values = 0;
el->values = talloc_array(ares->message->elements,
struct ldb_val,
(end - start) + 1);
if (!el->values) {
ldb_oom(ldb);
return ldb_module_done(ac->req, NULL, NULL,
LDB_ERR_OPERATIONS_ERROR);
}
for (j=start; j <= end; j++) {
el->values[el->num_values] = orig_values[j];
el->num_values++;
}
}
el->name = talloc_asprintf(ares->message->elements,
"%s;range=%u-%s", el->name, start,
end_str);
if (!el->name) {
ldb_oom(ldb);
return ldb_module_done(ac->req, NULL, NULL,
LDB_ERR_OPERATIONS_ERROR);
}
}
talloc_free(temp_ctx);
return ldb_module_send_entry(ac->req, ares->message, ares->controls);
}
/* search */
static int rr_search(struct ldb_module *module, struct ldb_request *req)
{
struct ldb_context *ldb;
unsigned int i;
unsigned int start, end;
const char **new_attrs = NULL;
bool found_rr = false;
struct ldb_request *down_req;
struct rr_context *ac;
int ret;
ldb = ldb_module_get_ctx(module);
/* Strip the range request from the attribute */
for (i = 0; req->op.search.attrs && req->op.search.attrs[i]; i++) {
char *p;
new_attrs = talloc_realloc(req, new_attrs, const char *, i+2);
new_attrs[i] = req->op.search.attrs[i];
new_attrs[i+1] = NULL;
p = strchr(new_attrs[i], ';');
if (!p) {
continue;
}
if (strncasecmp(p, ";range=", strlen(";range=")) != 0) {
continue;
}
end = (unsigned int)-1;
if (sscanf(p, ";range=%u-*", &start) != 1) {
if (sscanf(p, ";range=%u-%u", &start, &end) != 2) {
ldb_asprintf_errstring(ldb,
"range request error: "
"range request malformed");
return LDB_ERR_UNWILLING_TO_PERFORM;
}
}
if (start > end) {
ldb_asprintf_errstring(ldb, "range request error: start must not be greater than end");
return LDB_ERR_UNWILLING_TO_PERFORM;
}
found_rr = true;
new_attrs[i] = talloc_strndup(new_attrs, new_attrs[i],
(size_t)(p - new_attrs[i]));
if (!new_attrs[i]) {
return ldb_oom(ldb);
}
}
if (found_rr) {
ac = rr_init_context(module, req);
if (!ac) {
return ldb_operr(ldb);
}
ret = ldb_build_search_req_ex(&down_req, ldb, ac,
req->op.search.base,
req->op.search.scope,
req->op.search.tree,
new_attrs,
req->controls,
ac, rr_search_callback,
req);
LDB_REQ_SET_LOCATION(down_req);
if (ret != LDB_SUCCESS) {
return ret;
}
return ldb_next_request(module, down_req);
}
/* No change, just run the original request as if we were never here */
talloc_free(new_attrs);
return ldb_next_request(module, req);
}
static const struct ldb_module_ops ldb_ranged_results_module_ops = {
.name = "ranged_results",
.search = rr_search,
};
int ldb_ranged_results_module_init(const char *version)
{
LDB_MODULE_CHECK_VERSION(version);
return ldb_register_module(&ldb_ranged_results_module_ops);
}
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