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|
/*
ldb database library
Copyright (C) Simo Sorce 2004-2006
Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005
Copyright (C) Andrew Tridgell 2005
Copyright (C) Stefan Metzmacher 2007
** 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 repl_meta_data module
*
* Description: - add a unique objectGUID onto every new record,
* - handle whenCreated, whenChanged timestamps
* - handle uSNCreated, uSNChanged numbers
* - handle replPropertyMetaData attribute
*
* Author: Simo Sorce
* Author: Stefan Metzmacher
*/
#include "includes.h"
#include "lib/ldb/include/ldb.h"
#include "lib/ldb/include/ldb_errors.h"
#include "lib/ldb/include/ldb_private.h"
#include "dsdb/samdb/samdb.h"
#include "librpc/gen_ndr/ndr_misc.h"
#include "librpc/gen_ndr/ndr_drsblobs.h"
struct replmd_replicated_request {
struct ldb_module *module;
struct ldb_handle *handle;
struct ldb_request *orig_req;
struct dsdb_extended_replicated_objects *objs;
uint32_t index_current;
struct {
TALLOC_CTX *mem_ctx;
struct ldb_request *search_req;
struct ldb_message *search_msg;
int search_ret;
struct ldb_request *change_req;
int change_ret;
} sub;
};
static struct replmd_replicated_request *replmd_replicated_init_handle(struct ldb_module *module,
struct ldb_request *req,
struct dsdb_extended_replicated_objects *objs)
{
struct replmd_replicated_request *ar;
struct ldb_handle *h;
h = talloc_zero(req, struct ldb_handle);
if (h == NULL) {
ldb_set_errstring(module->ldb, "Out of Memory");
return NULL;
}
h->module = module;
h->state = LDB_ASYNC_PENDING;
h->status = LDB_SUCCESS;
ar = talloc_zero(h, struct replmd_replicated_request);
if (ar == NULL) {
ldb_set_errstring(module->ldb, "Out of Memory");
talloc_free(h);
return NULL;
}
h->private_data = ar;
ar->module = module;
ar->handle = h;
ar->orig_req = req;
ar->objs = objs;
req->handle = h;
return ar;
}
static struct ldb_message_element *replmd_find_attribute(const struct ldb_message *msg, const char *name)
{
int i;
for (i = 0; i < msg->num_elements; i++) {
if (ldb_attr_cmp(name, msg->elements[i].name) == 0) {
return &msg->elements[i];
}
}
return NULL;
}
/*
add a time element to a record
*/
static int add_time_element(struct ldb_message *msg, const char *attr, time_t t)
{
struct ldb_message_element *el;
char *s;
if (ldb_msg_find_element(msg, attr) != NULL) {
return 0;
}
s = ldb_timestring(msg, t);
if (s == NULL) {
return -1;
}
if (ldb_msg_add_string(msg, attr, s) != 0) {
return -1;
}
el = ldb_msg_find_element(msg, attr);
/* always set as replace. This works because on add ops, the flag
is ignored */
el->flags = LDB_FLAG_MOD_REPLACE;
return 0;
}
/*
add a uint64_t element to a record
*/
static int add_uint64_element(struct ldb_message *msg, const char *attr, uint64_t v)
{
struct ldb_message_element *el;
if (ldb_msg_find_element(msg, attr) != NULL) {
return 0;
}
if (ldb_msg_add_fmt(msg, attr, "%llu", (unsigned long long)v) != 0) {
return -1;
}
el = ldb_msg_find_element(msg, attr);
/* always set as replace. This works because on add ops, the flag
is ignored */
el->flags = LDB_FLAG_MOD_REPLACE;
return 0;
}
static int replmd_add_replicated(struct ldb_module *module, struct ldb_request *req, struct ldb_control *ctrl)
{
struct ldb_control **saved_ctrls;
int ret;
ldb_debug(module->ldb, LDB_DEBUG_TRACE, "replmd_add_replicated\n");
if (!save_controls(ctrl, req, &saved_ctrls)) {
return LDB_ERR_OPERATIONS_ERROR;
}
ret = ldb_next_request(module, req);
req->controls = saved_ctrls;
return ret;
}
static int replmd_add_originating(struct ldb_module *module, struct ldb_request *req)
{
struct ldb_request *down_req;
struct ldb_message_element *attribute;
struct ldb_message *msg;
struct ldb_val v;
struct GUID guid;
uint64_t seq_num;
NTSTATUS nt_status;
int ret;
time_t t = time(NULL);
ldb_debug(module->ldb, LDB_DEBUG_TRACE, "replmd_add_originating\n");
if ((attribute = replmd_find_attribute(req->op.add.message, "objectGUID")) != NULL ) {
return ldb_next_request(module, req);
}
down_req = talloc(req, struct ldb_request);
if (down_req == NULL) {
return LDB_ERR_OPERATIONS_ERROR;
}
*down_req = *req;
/* we have to copy the message as the caller might have it as a const */
down_req->op.add.message = msg = ldb_msg_copy_shallow(down_req, req->op.add.message);
if (msg == NULL) {
talloc_free(down_req);
return LDB_ERR_OPERATIONS_ERROR;
}
/* a new GUID */
guid = GUID_random();
nt_status = ndr_push_struct_blob(&v, msg, &guid,
(ndr_push_flags_fn_t)ndr_push_GUID);
if (!NT_STATUS_IS_OK(nt_status)) {
talloc_free(down_req);
return LDB_ERR_OPERATIONS_ERROR;
}
ret = ldb_msg_add_value(msg, "objectGUID", &v, NULL);
if (ret) {
talloc_free(down_req);
return ret;
}
if (add_time_element(msg, "whenCreated", t) != 0 ||
add_time_element(msg, "whenChanged", t) != 0) {
talloc_free(down_req);
return LDB_ERR_OPERATIONS_ERROR;
}
/* Get a sequence number from the backend */
ret = ldb_sequence_number(module->ldb, LDB_SEQ_NEXT, &seq_num);
if (ret == LDB_SUCCESS) {
if (add_uint64_element(msg, "uSNCreated", seq_num) != 0 ||
add_uint64_element(msg, "uSNChanged", seq_num) != 0) {
talloc_free(down_req);
return LDB_ERR_OPERATIONS_ERROR;
}
}
ldb_set_timeout_from_prev_req(module->ldb, req, down_req);
/* go on with the call chain */
ret = ldb_next_request(module, down_req);
/* do not free down_req as the call results may be linked to it,
* it will be freed when the upper level request get freed */
if (ret == LDB_SUCCESS) {
req->handle = down_req->handle;
}
return ret;
}
static int replmd_add(struct ldb_module *module, struct ldb_request *req)
{
struct ldb_control *ctrl;
/* do not manipulate our control entries */
if (ldb_dn_is_special(req->op.add.message->dn)) {
return ldb_next_request(module, req);
}
ctrl = get_control_from_list(req->controls, DSDB_CONTROL_REPLICATED_OBJECT_OID);
if (ctrl) {
/* handle replicated objects different */
return replmd_add_replicated(module, req, ctrl);
}
return replmd_add_originating(module, req);
}
static int replmd_modify_replicated(struct ldb_module *module, struct ldb_request *req, struct ldb_control *ctrl)
{
struct ldb_control **saved_ctrls;
int ret;
ldb_debug(module->ldb, LDB_DEBUG_TRACE, "replmd_modify_replicated\n");
if (!save_controls(ctrl, req, &saved_ctrls)) {
return LDB_ERR_OPERATIONS_ERROR;
}
ret = ldb_next_request(module, req);
req->controls = saved_ctrls;
return ret;
}
static int replmd_modify_originating(struct ldb_module *module, struct ldb_request *req)
{
struct ldb_request *down_req;
struct ldb_message *msg;
int ret;
time_t t = time(NULL);
uint64_t seq_num;
ldb_debug(module->ldb, LDB_DEBUG_TRACE, "replmd_modify_originating\n");
down_req = talloc(req, struct ldb_request);
if (down_req == NULL) {
return LDB_ERR_OPERATIONS_ERROR;
}
*down_req = *req;
/* we have to copy the message as the caller might have it as a const */
down_req->op.mod.message = msg = ldb_msg_copy_shallow(down_req, req->op.mod.message);
if (msg == NULL) {
talloc_free(down_req);
return LDB_ERR_OPERATIONS_ERROR;
}
if (add_time_element(msg, "whenChanged", t) != 0) {
talloc_free(down_req);
return LDB_ERR_OPERATIONS_ERROR;
}
/* Get a sequence number from the backend */
ret = ldb_sequence_number(module->ldb, LDB_SEQ_NEXT, &seq_num);
if (ret == LDB_SUCCESS) {
if (add_uint64_element(msg, "uSNChanged", seq_num) != 0) {
talloc_free(down_req);
return LDB_ERR_OPERATIONS_ERROR;
}
}
ldb_set_timeout_from_prev_req(module->ldb, req, down_req);
/* go on with the call chain */
ret = ldb_next_request(module, down_req);
/* do not free down_req as the call results may be linked to it,
* it will be freed when the upper level request get freed */
if (ret == LDB_SUCCESS) {
req->handle = down_req->handle;
}
return ret;
}
static int replmd_modify(struct ldb_module *module, struct ldb_request *req)
{
struct ldb_control *ctrl;
/* do not manipulate our control entries */
if (ldb_dn_is_special(req->op.mod.message->dn)) {
return ldb_next_request(module, req);
}
ctrl = get_control_from_list(req->controls, DSDB_CONTROL_REPLICATED_OBJECT_OID);
if (ctrl) {
/* handle replicated objects different */
return replmd_modify_replicated(module, req, ctrl);
}
return replmd_modify_originating(module, req);
}
static int replmd_replicated_request_reply_helper(struct replmd_replicated_request *ar, int ret)
{
struct ldb_reply *ares = NULL;
ar->handle->status = ret;
ar->handle->state = LDB_ASYNC_DONE;
if (!ar->orig_req->callback) {
return LDB_SUCCESS;
}
/* we're done and need to report the success to the caller */
ares = talloc_zero(ar, struct ldb_reply);
if (!ares) {
ar->handle->status = LDB_ERR_OPERATIONS_ERROR;
ar->handle->state = LDB_ASYNC_DONE;
return LDB_ERR_OPERATIONS_ERROR;
}
ares->type = LDB_REPLY_EXTENDED;
ares->response = NULL;
return ar->orig_req->callback(ar->module->ldb, ar->orig_req->context, ares);
}
static int replmd_replicated_request_done(struct replmd_replicated_request *ar)
{
return replmd_replicated_request_reply_helper(ar, LDB_SUCCESS);
}
static int replmd_replicated_request_error(struct replmd_replicated_request *ar, int ret)
{
return replmd_replicated_request_reply_helper(ar, ret);
}
static int replmd_replicated_request_werror(struct replmd_replicated_request *ar, WERROR status)
{
int ret = LDB_ERR_OTHER;
/* TODO: do some error mapping */
return replmd_replicated_request_reply_helper(ar, ret);
}
static int replmd_replicated_apply_next(struct replmd_replicated_request *ar);
static int replmd_replicated_apply_add_callback(struct ldb_context *ldb,
void *private_data,
struct ldb_reply *ares)
{
#ifdef REPLMD_FULL_ASYNC /* TODO: active this code when ldb support full async code */
struct replmd_replicated_request *ar = talloc_get_type(private_data,
struct replmd_replicated_request);
ar->sub.change_ret = ldb_wait(ar->sub.search_req->handle, LDB_WAIT_ALL);
if (ar->sub.change_ret != LDB_SUCCESS) {
return replmd_replicated_request_error(ar, ar->sub.change_ret);
}
talloc_free(ar->sub.mem_ctx);
ZERO_STRUCT(ar->sub);
ar->index_current++;
return replmd_replicated_apply_next(ar);
#else
return LDB_SUCCESS;
#endif
}
static int replmd_replicated_apply_add(struct replmd_replicated_request *ar)
{
NTSTATUS nt_status;
struct ldb_message *msg;
struct replPropertyMetaDataBlob *md;
struct ldb_val md_value;
uint32_t i;
uint64_t seq_num;
int ret;
msg = ar->objs->objects[ar->index_current].msg;
md = ar->objs->objects[ar->index_current].meta_data;
ret = ldb_sequence_number(ar->module->ldb, LDB_SEQ_NEXT, &seq_num);
if (ret != LDB_SUCCESS) {
return replmd_replicated_request_error(ar, ret);
}
ret = samdb_msg_add_uint64(ar->module->ldb, msg, msg, "uSNCreated", seq_num);
if (ret != LDB_SUCCESS) {
return replmd_replicated_request_error(ar, ret);
}
ret = samdb_msg_add_uint64(ar->module->ldb, msg, msg, "uSNChanged", seq_num);
if (ret != LDB_SUCCESS) {
return replmd_replicated_request_error(ar, ret);
}
md = ar->objs->objects[ar->index_current].meta_data;
for (i=0; i < md->ctr.ctr1.count; i++) {
md->ctr.ctr1.array[i].local_usn = seq_num;
}
nt_status = ndr_push_struct_blob(&md_value, msg, md,
(ndr_push_flags_fn_t)ndr_push_replPropertyMetaDataBlob);
if (!NT_STATUS_IS_OK(nt_status)) {
return replmd_replicated_request_werror(ar, ntstatus_to_werror(nt_status));
}
ret = ldb_msg_add_value(msg, "replPropertyMetaData", &md_value, NULL);
if (ret != LDB_SUCCESS) {
return replmd_replicated_request_error(ar, ret);
}
ret = ldb_build_add_req(&ar->sub.change_req,
ar->module->ldb,
ar->sub.mem_ctx,
msg,
NULL,
ar,
replmd_replicated_apply_add_callback);
if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
#ifdef REPLMD_FULL_ASYNC /* TODO: active this code when ldb support full async code */
return ldb_next_request(ar->module, ar->sub.change_req);
#else
ret = ldb_next_request(ar->module, ar->sub.change_req);
if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
ar->sub.change_ret = ldb_wait(ar->sub.search_req->handle, LDB_WAIT_ALL);
if (ar->sub.change_ret != LDB_SUCCESS) {
return replmd_replicated_request_error(ar, ar->sub.change_ret);
}
talloc_free(ar->sub.mem_ctx);
ZERO_STRUCT(ar->sub);
ar->index_current++;
return LDB_SUCCESS;
#endif
}
static int replmd_replicated_apply_merge(struct replmd_replicated_request *ar)
{
#ifdef REPLMD_FULL_ASYNC /* TODO: active this code when ldb support full async code */
#error sorry replmd_replicated_apply_merge not implemented
#else
ldb_debug(ar->module->ldb, LDB_DEBUG_FATAL,
"replmd_replicated_apply_merge: ignore [%u]\n",
ar->index_current);
talloc_free(ar->sub.mem_ctx);
ZERO_STRUCT(ar->sub);
ar->index_current++;
return LDB_SUCCESS;
#endif
}
static int replmd_replicated_apply_search_callback(struct ldb_context *ldb,
void *private_data,
struct ldb_reply *ares)
{
struct replmd_replicated_request *ar = talloc_get_type(private_data,
struct replmd_replicated_request);
bool is_done = false;
switch (ares->type) {
case LDB_REPLY_ENTRY:
ar->sub.search_msg = talloc_steal(ar->sub.mem_ctx, ares->message);
break;
case LDB_REPLY_REFERRAL:
/* we ignore referrals */
break;
case LDB_REPLY_EXTENDED:
case LDB_REPLY_DONE:
is_done = true;
}
talloc_free(ares);
#ifdef REPLMD_FULL_ASYNC /* TODO: active this code when ldb support full async code */
if (is_done) {
ar->sub.search_ret = ldb_wait(ar->sub.search_req->handle, LDB_WAIT_ALL);
if (ar->sub.search_ret != LDB_SUCCESS) {
return replmd_replicated_request_error(ar, ar->sub.search_ret);
}
if (ar->sub.search_msg) {
return replmd_replicated_apply_merge(ar);
}
return replmd_replicated_apply_add(ar);
}
#endif
return LDB_SUCCESS;
}
static int replmd_replicated_apply_search(struct replmd_replicated_request *ar)
{
int ret;
char *tmp_str;
char *filter;
tmp_str = ldb_binary_encode(ar->sub.mem_ctx, ar->objs->objects[ar->index_current].guid_value);
if (!tmp_str) return replmd_replicated_request_werror(ar, WERR_NOMEM);
filter = talloc_asprintf(ar->sub.mem_ctx, "(objectGUID=%s)", tmp_str);
if (!filter) return replmd_replicated_request_werror(ar, WERR_NOMEM);
talloc_free(tmp_str);
ret = ldb_build_search_req(&ar->sub.search_req,
ar->module->ldb,
ar->sub.mem_ctx,
ar->objs->partition_dn,
LDB_SCOPE_SUBTREE,
filter,
NULL,
NULL,
ar,
replmd_replicated_apply_search_callback);
if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
#ifdef REPLMD_FULL_ASYNC /* TODO: active this code when ldb support full async code */
return ldb_next_request(ar->module, ar->sub.search_req);
#else
ret = ldb_next_request(ar->module, ar->sub.search_req);
if (ret != LDB_SUCCESS) return replmd_replicated_request_error(ar, ret);
ar->sub.search_ret = ldb_wait(ar->sub.search_req->handle, LDB_WAIT_ALL);
if (ar->sub.search_ret != LDB_SUCCESS) {
return replmd_replicated_request_error(ar, ar->sub.search_ret);
}
if (ar->sub.search_msg) {
return replmd_replicated_apply_merge(ar);
}
return replmd_replicated_apply_add(ar);
#endif
}
static int replmd_replicated_apply_next(struct replmd_replicated_request *ar)
{
if (ar->index_current >= ar->objs->num_objects) {
return replmd_replicated_request_done(ar);
}
ar->sub.mem_ctx = talloc_new(ar);
if (!ar->sub.mem_ctx) return replmd_replicated_request_werror(ar, WERR_NOMEM);
return replmd_replicated_apply_search(ar);
}
static int replmd_extended_replicated_objects(struct ldb_module *module, struct ldb_request *req)
{
struct dsdb_extended_replicated_objects *objs;
struct replmd_replicated_request *ar;
ldb_debug(module->ldb, LDB_DEBUG_TRACE, "replmd_extended_replicated_objects\n");
objs = talloc_get_type(req->op.extended.data, struct dsdb_extended_replicated_objects);
if (!objs) {
return LDB_ERR_PROTOCOL_ERROR;
}
ar = replmd_replicated_init_handle(module, req, objs);
if (!ar) {
return LDB_ERR_OPERATIONS_ERROR;
}
#ifdef REPLMD_FULL_ASYNC /* TODO: active this code when ldb support full async code */
return replmd_replicated_apply_next(ar);
#else
while (req->handle->state != LDB_ASYNC_DONE) {
replmd_replicated_apply_next(ar);
}
return LDB_SUCCESS;
#endif
}
static int replmd_extended(struct ldb_module *module, struct ldb_request *req)
{
if (strcmp(req->op.extended.oid, DSDB_EXTENDED_REPLICATED_OBJECTS_OID) == 0) {
return replmd_extended_replicated_objects(module, req);
}
return ldb_next_request(module, req);
}
static int replmd_wait_none(struct ldb_handle *handle) {
struct replmd_replicated_request *ar;
if (!handle || !handle->private_data) {
return LDB_ERR_OPERATIONS_ERROR;
}
ar = talloc_get_type(handle->private_data, struct replmd_replicated_request);
if (!ar) {
return LDB_ERR_OPERATIONS_ERROR;
}
/* we do only sync calls */
if (handle->state != LDB_ASYNC_DONE) {
return LDB_ERR_OPERATIONS_ERROR;
}
return handle->status;
}
static int replmd_wait_all(struct ldb_handle *handle) {
int ret;
while (handle->state != LDB_ASYNC_DONE) {
ret = replmd_wait_none(handle);
if (ret != LDB_SUCCESS) {
return ret;
}
}
return handle->status;
}
static int replmd_wait(struct ldb_handle *handle, enum ldb_wait_type type)
{
if (type == LDB_WAIT_ALL) {
return replmd_wait_all(handle);
} else {
return replmd_wait_none(handle);
}
}
static const struct ldb_module_ops replmd_ops = {
.name = "repl_meta_data",
.add = replmd_add,
.modify = replmd_modify,
.extended = replmd_extended,
.wait = replmd_wait
};
int repl_meta_data_module_init(void)
{
return ldb_register_module(&replmd_ops);
}
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