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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 "ldb_includes.h"
struct rr_context {
struct ldb_request *orig_req;
struct ldb_request *down_req;
};
static int rr_search_callback(struct ldb_context *ldb, void *context, struct ldb_reply *ares)
{
struct rr_context *rr_context = talloc_get_type(context, struct rr_context);
struct ldb_request *orig_req = rr_context->orig_req;
int i, j, ret;
if (ares->type != LDB_REPLY_ENTRY) {
return rr_context->orig_req->callback(ldb, rr_context->orig_req->context, ares);
}
/* Find those that are range requests from the attribute list */
for (i = 0; orig_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(orig_req->op.search.attrs[i], ';');
if (!p) {
continue;
}
if (strncasecmp(p, ";range=", strlen(";range=")) != 0) {
continue;
}
if (sscanf(p, ";range=%u-*", &start) == 1) {
end = (unsigned int)-1;
} else if (sscanf(p, ";range=%u-%u", &start, &end) != 2) {
continue;
}
new_attr = talloc_strndup(orig_req,
orig_req->op.search.attrs[i],
(unsigned int)(p-orig_req->op.search.attrs[i]));
if (!new_attr) {
ldb_oom(ldb);
return LDB_ERR_OPERATIONS_ERROR;
}
el = ldb_msg_find_element(ares->message, new_attr);
talloc_free(new_attr);
if (!el) {
continue;
}
if (start > end) {
ldb_asprintf_errstring(ldb, "range request error: start must not be greater than end");
return LDB_ERR_UNWILLING_TO_PERFORM;
}
if (end >= el->num_values) {
/* Need to leave the requested attribute in
* there (so add an empty one to match) */
end_str = "*";
end = el->num_values;
ret = ldb_msg_add_empty(ares->message, orig_req->op.search.attrs[i],
0, NULL);
if (ret != LDB_SUCCESS) {
return ret;
}
} else {
end_str = talloc_asprintf(el, "%u", end);
}
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_ERR_UNWILLING_TO_PERFORM;
}
el->values = talloc_array(el, struct ldb_val, end - start);
el->num_values = 0;
if (!el->values) {
ldb_oom(ldb);
return 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(el, "%s;Range=%u-%s", el->name, start, end_str);
if (!el->name) {
ldb_oom(ldb);
return LDB_ERR_OPERATIONS_ERROR;
}
}
return rr_context->orig_req->callback(ldb, rr_context->orig_req->context, ares);
}
/* search */
static int rr_search(struct ldb_module *module, struct ldb_request *req)
{
int i;
unsigned int start, end;
const char **new_attrs = NULL;
struct rr_context *context;
bool found_rr = false;
/* 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(req->op.search.attrs[i], ';');
if (!p) {
continue;
}
if (strncasecmp(p, ";range=", strlen(";range=")) != 0) {
continue;
}
if (sscanf(p, ";range=%u-*", &start) == 1) {
} else if (sscanf(p, ";range=%u-%u", &start, &end) != 2) {
ldb_asprintf_errstring(module->ldb, "range request error: range requst malformed");
return LDB_ERR_UNWILLING_TO_PERFORM;
}
if (start > end) {
ldb_asprintf_errstring(module->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,
req->op.search.attrs[i],
(unsigned int)(p-req->op.search.attrs[i]));
if (!new_attrs[i]) {
ldb_oom(module->ldb);
return LDB_ERR_OPERATIONS_ERROR;
}
}
if (found_rr) {
int ret;
context = talloc(req, struct rr_context);
context->orig_req = req;
context->down_req = talloc(context, struct ldb_request);
*context->down_req = *req;
context->down_req->op.search.attrs = new_attrs;
context->down_req->callback = rr_search_callback;
context->down_req->context = context;
ret = ldb_next_request(module, context->down_req);
/* We don't need to implement our own 'wait' function, so pass the handle along */
if (ret == LDB_SUCCESS) {
req->handle = context->down_req->handle;
}
return ret;
}
/* No change, just run the original request as if we were never here */
return ldb_next_request(module, req);
}
static const struct ldb_module_ops rr_ops = {
.name = "ranged_results",
.search = rr_search,
};
int ldb_ranged_results_init(void)
{
return ldb_register_module(&rr_ops);
}
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