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rdn_name.c

/* 
   ldb database library

   Copyright (C) Andrew Bartlet 2005
   Copyright (C) Simo Sorce     2006

     ** 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: rdb_name
 *
 *  Component: ldb rdn name module
 *
 *  Description: keep a consistent name attribute on objects manpulations
 *
 *  Author: Andrew Bartlet
 *
 *  Modifications:
 *    - made the module async
 *      Simo Sorce Mar 2006
 */

#include "ldb_includes.h"

static struct ldb_message_element *rdn_name_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;
}

static int rdn_name_add(struct ldb_module *module, struct ldb_request *req)
{
      struct ldb_request *down_req;
      struct ldb_message *msg;
      struct ldb_message_element *attribute;
      const char *rdn_name;
      struct ldb_val rdn_val;
      int i, ret;

      ldb_debug(module->ldb, LDB_DEBUG_TRACE, "rdn_name_add_record\n");

      /* do not manipulate our control entries */
      if (ldb_dn_is_special(req->op.add.message->dn)) {
            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;

      down_req->op.add.message = msg = ldb_msg_copy_shallow(down_req, req->op.add.message);
      if (msg == NULL) {
            return LDB_ERR_OPERATIONS_ERROR;
      }

      rdn_name = ldb_dn_get_rdn_name(msg->dn);
      if (rdn_name == NULL) {
            talloc_free(down_req);
            return LDB_ERR_OPERATIONS_ERROR;
      }
      
      rdn_val = ldb_val_dup(msg, ldb_dn_get_rdn_val(msg->dn));
      
      /* Perhaps someone above us tried to set this? */
      if ((attribute = rdn_name_find_attribute(msg, "name")) != NULL ) {
            attribute->num_values = 0;
      }

      if (ldb_msg_add_value(msg, "name", &rdn_val, NULL) != 0) {
            talloc_free(down_req);
            return LDB_ERR_OPERATIONS_ERROR;
      }

      attribute = rdn_name_find_attribute(msg, rdn_name);

      if (!attribute) {
            if (ldb_msg_add_value(msg, rdn_name, &rdn_val, NULL) != 0) {
                  talloc_free(down_req);
                  return LDB_ERR_OPERATIONS_ERROR;
            }
      } else {
            const struct ldb_schema_attribute *a = ldb_schema_attribute_by_name(module->ldb, rdn_name);

            for (i = 0; i < attribute->num_values; i++) {
                  if (a->syntax->comparison_fn(module->ldb, msg, &rdn_val, &attribute->values[i]) == 0) {
                        /* overwrite so it matches in case */
                        attribute->values[i] = rdn_val;
                        break;
                  }
            }
            if (i == attribute->num_values) {
                  ldb_debug_set(module->ldb, LDB_DEBUG_FATAL, 
                              "RDN mismatch on %s: %s (%s)", 
                              ldb_dn_get_linearized(msg->dn), rdn_name, rdn_val.data);
                  talloc_free(down_req);
                  return LDB_ERR_OPERATIONS_ERROR;
            }
      }

      /* 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;
}

struct rename_context {

      enum {RENAME_RENAME, RENAME_MODIFY} step;
      struct ldb_request *orig_req;
      struct ldb_request *down_req;
      struct ldb_request *mod_req;
};

static int rdn_name_rename(struct ldb_module *module, struct ldb_request *req)
{
      struct ldb_handle *h;
      struct rename_context *ac;

      ldb_debug(module->ldb, LDB_DEBUG_TRACE, "rdn_name_rename\n");

      /* do not manipulate our control entries */
      if (ldb_dn_is_special(req->op.rename.newdn)) {
            return ldb_next_request(module, req);
      }

      h = talloc_zero(req, struct ldb_handle);
      if (h == NULL) {
            return LDB_ERR_OPERATIONS_ERROR;
      }

      h->module = module;

      ac = talloc_zero(h, struct rename_context);
      if (ac == NULL) {
            return LDB_ERR_OPERATIONS_ERROR;
      }

      h->private_data = (void *)ac;

      h->state = LDB_ASYNC_INIT;
      h->status = LDB_SUCCESS;

      ac->orig_req = req;
      ac->down_req = talloc(req, struct ldb_request);
      if (ac->down_req == NULL) {
            return LDB_ERR_OPERATIONS_ERROR;
      }

      *(ac->down_req) = *req;

      ac->step = RENAME_RENAME;

      req->handle = h;

      /* rename first, modify "name" if rename is ok */
      return ldb_next_request(module, ac->down_req);
}

static int rdn_name_rename_do_mod(struct ldb_handle *h) {

      struct rename_context *ac;
      const char *rdn_name;
      struct ldb_val rdn_val;
      struct ldb_message *msg;

      ac = talloc_get_type(h->private_data, struct rename_context);

      ac->mod_req = talloc_zero(ac, struct ldb_request);

      ac->mod_req->operation = LDB_MODIFY;
      ac->mod_req->op.mod.message = msg = ldb_msg_new(ac->mod_req);
      if (msg == NULL) {
            return LDB_ERR_OPERATIONS_ERROR;
      }

      msg->dn = ldb_dn_copy(msg, ac->orig_req->op.rename.newdn);
      if (msg->dn == NULL) {
            return LDB_ERR_OPERATIONS_ERROR;
      }

      rdn_name = ldb_dn_get_rdn_name(ac->orig_req->op.rename.newdn);
      if (rdn_name == NULL) {
            return LDB_ERR_OPERATIONS_ERROR;
      }
      
      rdn_val = ldb_val_dup(msg, ldb_dn_get_rdn_val(ac->orig_req->op.rename.newdn));
      
      if (ldb_msg_add_empty(msg, rdn_name, LDB_FLAG_MOD_REPLACE, NULL) != 0) {
            return LDB_ERR_OPERATIONS_ERROR;
      }
      if (ldb_msg_add_value(msg, rdn_name, &rdn_val, NULL) != 0) {
            return LDB_ERR_OPERATIONS_ERROR;
      }
      if (ldb_msg_add_empty(msg, "name", LDB_FLAG_MOD_REPLACE, NULL) != 0) {
            return LDB_ERR_OPERATIONS_ERROR;
      }
      if (ldb_msg_add_value(msg, "name", &rdn_val, NULL) != 0) {
            return LDB_ERR_OPERATIONS_ERROR;
      }

      ldb_set_timeout_from_prev_req(h->module->ldb, ac->orig_req, ac->mod_req);

      ac->step = RENAME_MODIFY;

      /* do the mod call */
      return ldb_request(h->module->ldb, ac->mod_req);
}

static int rename_wait(struct ldb_handle *handle)
{
      struct rename_context *ac;
      int ret;
    
      if (!handle || !handle->private_data) {
            return LDB_ERR_OPERATIONS_ERROR;
      }

      if (handle->state == LDB_ASYNC_DONE) {
            return handle->status;
      }

      handle->state = LDB_ASYNC_PENDING;
      handle->status = LDB_SUCCESS;

      ac = talloc_get_type(handle->private_data, struct rename_context);

      switch(ac->step) {
      case RENAME_RENAME:
            ret = ldb_wait(ac->down_req->handle, LDB_WAIT_NONE);
            if (ret != LDB_SUCCESS) {
                  handle->status = ret;
                  goto done;
            }
            if (ac->down_req->handle->status != LDB_SUCCESS) {
                  handle->status = ac->down_req->handle->status;
                  goto done;
            }

            if (ac->down_req->handle->state != LDB_ASYNC_DONE) {
                  return LDB_SUCCESS;
            }

            /* rename operation done */
            return rdn_name_rename_do_mod(handle);

      case RENAME_MODIFY:
            ret = ldb_wait(ac->mod_req->handle, LDB_WAIT_NONE);
            if (ret != LDB_SUCCESS) {
                  handle->status = ret;
                  goto done;
            }
            if (ac->mod_req->handle->status != LDB_SUCCESS) {
                  handle->status = ac->mod_req->handle->status;
                  goto done;
            }

            if (ac->mod_req->handle->state != LDB_ASYNC_DONE) {
                  return LDB_SUCCESS;
            }

            break;

      default:
            ret = LDB_ERR_OPERATIONS_ERROR;
            goto done;
      }

      ret = LDB_SUCCESS;

done:
      handle->state = LDB_ASYNC_DONE;
      return ret;
}

static int rename_wait_all(struct ldb_handle *handle) {

      int ret;

      while (handle->state != LDB_ASYNC_DONE) {
            ret = rename_wait(handle);
            if (ret != LDB_SUCCESS) {
                  return ret;
            }
      }

      return handle->status;
}

static int rdn_name_wait(struct ldb_handle *handle, enum ldb_wait_type type)
{
      if (type == LDB_WAIT_ALL) {
            return rename_wait_all(handle);
      } else {
            return rename_wait(handle);
      }
}

static const struct ldb_module_ops rdn_name_ops = {
      .name              = "rdn_name",
      .add               = rdn_name_add,
      .rename            = rdn_name_rename,
      .wait              = rdn_name_wait
};


int ldb_rdn_name_init(void)
{
      return ldb_register_module(&rdn_name_ops);
}

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