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/*
RID allocation helper functions
Copyright (C) Andrew Bartlett 2010
Copyright (C) Andrew Tridgell 2010
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: RID allocation logic
*
* Description: manage RID Set and RID Manager objects
*
*/
#include "includes.h"
#include "ldb_module.h"
#include "dsdb/samdb/samdb.h"
#include "dsdb/samdb/ldb_modules/util.h"
/* allocate a RID using our RID Set
If we run out of RIDs then allocate a new pool
either locally or by contacting the RID Manager
*/
int ridalloc_allocate_rid(struct ldb_module *module, uint32_t *rid)
{
struct ldb_context *ldb;
static const char * const attrs[] = { "rIDAllocationPool", "rIDNextRID" , NULL };
int ret;
struct ldb_dn *rid_set_dn;
struct ldb_result *res;
uint64_t alloc_pool;
uint32_t alloc_pool_lo, alloc_pool_hi;
int next_rid;
struct ldb_message *msg;
TALLOC_CTX *tmp_ctx = talloc_new(module);
struct ldb_message_element *el;
struct ldb_val v1, v2;
char *ridstring;
ldb = ldb_module_get_ctx(module);
ret = samdb_rid_set_dn(ldb, tmp_ctx, &rid_set_dn);
if (ret != LDB_SUCCESS) {
ldb_asprintf_errstring(ldb, __location__ ": No RID Set DN");
talloc_free(tmp_ctx);
return ret;
}
ret = dsdb_module_search_dn(module, tmp_ctx, &res, rid_set_dn, attrs, 0);
if (ret != LDB_SUCCESS) {
ldb_asprintf_errstring(ldb, __location__ ": No RID Set %s",
ldb_dn_get_linearized(rid_set_dn));
talloc_free(tmp_ctx);
return ret;
}
alloc_pool = ldb_msg_find_attr_as_uint64(res->msgs[0], "rIDAllocationPool", 0);
next_rid = ldb_msg_find_attr_as_int(res->msgs[0], "rIDNextRID", -1);
if (next_rid == -1 || alloc_pool == 0) {
ldb_asprintf_errstring(ldb, __location__ ": Bad RID Set %s",
ldb_dn_get_linearized(rid_set_dn));
talloc_free(tmp_ctx);
return LDB_ERR_OPERATIONS_ERROR;
}
alloc_pool_lo = alloc_pool & 0xFFFFFFFF;
alloc_pool_hi = alloc_pool >> 32;
if (next_rid > alloc_pool_hi) {
/* TODO: add call to RID Manager */
ldb_asprintf_errstring(ldb, __location__ ": Out of RIDs in RID Set %s",
ldb_dn_get_linearized(rid_set_dn));
talloc_free(tmp_ctx);
return LDB_ERR_OPERATIONS_ERROR;
}
/* despite the name, rIDNextRID is the value of the last user
* added by this DC, not the next available RID */
(*rid) = next_rid + 1;
/* now modify the RID Set to use up this RID using a
* constrained delete/add */
msg = ldb_msg_new(tmp_ctx);
msg->dn = rid_set_dn;
ret = ldb_msg_add_empty(msg, "rIDNextRID", LDB_FLAG_MOD_DELETE, &el);
if (ret != LDB_SUCCESS) {
talloc_free(tmp_ctx);
return ret;
}
el->num_values = 1;
el->values = &v1;
ridstring = talloc_asprintf(msg, "%u", (unsigned)next_rid);
if (!ridstring) {
ldb_module_oom(module);
talloc_free(tmp_ctx);
return LDB_ERR_OPERATIONS_ERROR;
}
v1 = data_blob_string_const(ridstring);
ret = ldb_msg_add_empty(msg, "rIDNextRID", LDB_FLAG_MOD_ADD, &el);
if (ret != LDB_SUCCESS) {
talloc_free(tmp_ctx);
return ret;
}
el->num_values = 1;
el->values = &v2;
ridstring = talloc_asprintf(msg, "%u", (unsigned)next_rid+1);
if (!ridstring) {
ldb_module_oom(module);
talloc_free(tmp_ctx);
return LDB_ERR_OPERATIONS_ERROR;
}
v2 = data_blob_string_const(ridstring);
ret = dsdb_module_modify(module, msg, 0);
if (ret != LDB_SUCCESS) {
talloc_free(tmp_ctx);
return ret;
}
talloc_free(tmp_ctx);
return LDB_SUCCESS;
}
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