source4/lib/ldb/modules/asq.c

   1 /*
   2    ldb database library
   3
   4    Copyright (C) Simo Sorce  2005
   5
   6      ** NOTE! The following LGPL license applies to the ldb
   7      ** library. This does NOT imply that all of Samba is released
   8      ** under the LGPL
   9
  10    This library is free software; you can redistribute it and/or
  11    modify it under the terms of the GNU Lesser General Public
  12    License as published by the Free Software Foundation; either
  13    version 2 of the License, or (at your option) any later version.
  14
  15    This library is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18    Lesser General Public License for more details.
  19
  20    You should have received a copy of the GNU Lesser General Public
  21    License along with this library; if not, write to the Free Software
  22    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  23 */
  24
  25 /*
  26  *  Name: ldb
  27  *
  28  *  Component: ldb attribute scoped query control module
  29  *
  30  *  Description: this module searches all the the objects pointed
  31  *               by the DNs contained in the references attribute
  32  *
  33  *  Author: Simo Sorce
  34  */
  35
  36 #include "includes.h"
  37 #include "ldb/include/includes.h"
  38
  39 struct asq_context {
  40
  41         enum {ASQ_INIT, ASQ_SEARCH_BASE, ASQ_SEARCH_MULTI} step;
  42
  43         struct ldb_module *module;
  44         struct ldb_request *orig_req;
  45
  46         struct ldb_asq_control *asq_ctrl;
  47
  48         const char * const *req_attrs;
  49         char *req_attribute;
  50         enum {
  51                 ASQ_CTRL_SUCCESS                        = 0,
  52                 ASQ_CTRL_INVALID_ATTRIBUTE_SYNTAX       = 21,
  53                 ASQ_CTRL_UNWILLING_TO_PERFORM           = 53,
  54                 ASQ_CTRL_AFFECTS_MULTIPLE_DSA           = 71
  55         } asq_ret;
  56
  57         struct ldb_request *base_req;
  58         struct ldb_reply *base_res;
  59
  60         struct ldb_request **reqs;
  61         int num_reqs;
  62         int cur_req;
  63
  64         struct ldb_control **controls;
  65 };
  66
  67 static struct ldb_handle *init_handle(struct ldb_request *req, struct ldb_module *module)
  68 {
  69         struct asq_context *ac;
  70         struct ldb_handle *h;
  71
  72         h = talloc_zero(req, struct ldb_handle);
  73         if (h == NULL) {
  74                 ldb_set_errstring(module->ldb, "Out of Memory");
  75                 return NULL;
  76         }
  77
  78         h->module = module;
  79
  80         ac = talloc_zero(h, struct asq_context);
  81         if (ac == NULL) {
  82                 ldb_set_errstring(module->ldb, "Out of Memory");
  83                 talloc_free(h);
  84                 return NULL;
  85         }
  86
  87         h->private_data = (void *)ac;
  88
  89         h->state = LDB_ASYNC_INIT;
  90         h->status = LDB_SUCCESS;
  91
  92         ac->step = ASQ_INIT;
  93         ac->module = module;
  94         ac->orig_req = req;
  95
  96         return h;
  97 }
  98
  99 static int asq_terminate(struct ldb_handle *handle)
 100 {
 101         struct asq_context *ac;
 102         struct ldb_reply *ares;
 103         struct ldb_asq_control *asq;
 104         int i;
 105
 106         ac = talloc_get_type(handle->private_data, struct asq_context);
 107         if (ac == NULL) {
 108                 return LDB_ERR_OPERATIONS_ERROR;
 109         }
 110
 111         handle->status = LDB_SUCCESS;
 112         handle->state = LDB_ASYNC_DONE;
 113
 114         ares = talloc_zero(ac, struct ldb_reply);
 115         if (ares == NULL)
 116                 return LDB_ERR_OPERATIONS_ERROR;
 117
 118         ares->type = LDB_REPLY_DONE;
 119
 120         if (ac->controls) {
 121                 for (i = 0; ac->controls[i]; i++);
 122                 ares->controls = talloc_move(ares, &ac->controls);
 123         } else {
 124                 i = 0;
 125         }
 126
 127         ares->controls = talloc_realloc(ares, ares->controls, struct ldb_control *, i + 2);
 128
 129         if (ares->controls == NULL)
 130                 return LDB_ERR_OPERATIONS_ERROR;
 131
 132         ares->controls[i] = talloc(ares->controls, struct ldb_control);
 133         if (ares->controls[i] == NULL)
 134                 return LDB_ERR_OPERATIONS_ERROR;
 135
 136         ares->controls[i]->oid = LDB_CONTROL_ASQ_OID;
 137         ares->controls[i]->critical = 0;
 138
 139         asq = talloc_zero(ares->controls[i], struct ldb_asq_control);
 140         if (asq == NULL)
 141                 return LDB_ERR_OPERATIONS_ERROR;
 142
 143         asq->result = ac->asq_ret;
 144
 145         ares->controls[i]->data = asq;
 146
 147         ares->controls[i + 1] = NULL;
 148
 149         ac->orig_req->callback(ac->module->ldb, ac->orig_req->context, ares);
 150
 151         return LDB_SUCCESS;
 152 }
 153
 154 static int asq_base_callback(struct ldb_context *ldb, void *context, struct ldb_reply *ares)
 155 {
 156         struct asq_context *ac;
 157
 158         if (!context || !ares) {
 159                 ldb_set_errstring(ldb, "NULL Context or Result in callback");
 160                 goto error;
 161         }
 162
 163         ac = talloc_get_type(context, struct asq_context);
 164         if (ac == NULL) {
 165                 goto error;
 166         }
 167
 168         /* we are interested only in the single reply (base search) we receive here */
 169         if (ares->type == LDB_REPLY_ENTRY) {
 170                 ac->base_res = talloc_move(ac, &ares);
 171         } else {
 172                 talloc_free(ares);
 173         }
 174
 175         return LDB_SUCCESS;
 176 error:
 177         talloc_free(ares);
 178         return LDB_ERR_OPERATIONS_ERROR;
 179 }
 180
 181 static int asq_reqs_callback(struct ldb_context *ldb, void *context, struct ldb_reply *ares)
 182 {
 183         struct asq_context *ac;
 184
 185         if (!context || !ares) {
 186                 ldb_set_errstring(ldb, "NULL Context or Result in callback");
 187                 goto error;
 188         }
 189
 190         ac = talloc_get_type(context, struct asq_context);
 191         if (ac == NULL) {
 192                 goto error;
 193         }
 194
 195         /* we are interested only in the single reply (base search) we receive here */
 196         if (ares->type == LDB_REPLY_ENTRY) {
 197
 198                 /* pass the message up to the original callback as we
 199                  * do not have to elaborate on it any further */
 200                 return ac->orig_req->callback(ac->module->ldb, ac->orig_req->context, ares);
 201
 202         } else { /* ignore any REFERRAL or DONE reply */
 203                 talloc_free(ares);
 204         }
 205
 206         return LDB_SUCCESS;
 207 error:
 208         talloc_free(ares);
 209         return LDB_ERR_OPERATIONS_ERROR;
 210 }
 211
 212 static int asq_build_first_request(struct asq_context *ac)
 213 {
 214         char **base_attrs;
 215
 216         ac->base_req = talloc_zero(ac, struct ldb_request);
 217         if (ac->base_req == NULL) return LDB_ERR_OPERATIONS_ERROR;
 218
 219         ac->base_req->operation = ac->orig_req->operation;
 220         ac->base_req->op.search.base = ac->orig_req->op.search.base;
 221         ac->base_req->op.search.scope = LDB_SCOPE_BASE;
 222         ac->base_req->op.search.tree = ac->orig_req->op.search.tree;
 223         base_attrs = talloc_array(ac->base_req, char *, 2);
 224         if (base_attrs == NULL) return LDB_ERR_OPERATIONS_ERROR;
 225
 226         base_attrs[0] = talloc_strdup(base_attrs, ac->asq_ctrl->source_attribute);
 227         if (base_attrs[0] == NULL) return LDB_ERR_OPERATIONS_ERROR;
 228
 229         base_attrs[1] = NULL;
 230         ac->base_req->op.search.attrs = (const char * const *)base_attrs;
 231
 232         ac->base_req->context = ac;
 233         ac->base_req->callback = asq_base_callback;
 234         ldb_set_timeout_from_prev_req(ac->module->ldb, ac->orig_req, ac->base_req);
 235
 236         return LDB_SUCCESS;
 237 }
 238
 239 static int asq_build_multiple_requests(struct asq_context *ac, struct ldb_handle *handle)
 240 {
 241         struct ldb_message_element *el;
 242         int i;
 243
 244         /* look up the DNs */
 245         if (ac->base_res == NULL) {
 246                 return LDB_ERR_NO_SUCH_OBJECT;
 247         }
 248         el = ldb_msg_find_element(ac->base_res->message, ac->req_attribute);
 249         /* no values found */
 250         if (el == NULL) {
 251                 ac->asq_ret = ASQ_CTRL_SUCCESS;
 252                 return asq_terminate(handle);
 253         }
 254
 255         ac->num_reqs = el->num_values;
 256         ac->cur_req = 0;
 257         ac->reqs = talloc_array(ac, struct ldb_request *, ac->num_reqs);
 258         if (ac->reqs == NULL) {
 259                 return LDB_ERR_OPERATIONS_ERROR;
 260         }
 261
 262         for (i = 0; i < el->num_values; i++) {
 263
 264                 ac->reqs[i] = talloc_zero(ac->reqs, struct ldb_request);
 265                 if (ac->reqs[i] == NULL)
 266                         return LDB_ERR_OPERATIONS_ERROR;
 267                 ac->reqs[i]->operation = LDB_SEARCH;
 268                 ac->reqs[i]->op.search.base = ldb_dn_new(ac->reqs[i], ac->module->ldb, (const char *)el->values[i].data);
 269                 if ( ! ldb_dn_validate(ac->reqs[i]->op.search.base)) {
 270                         ac->asq_ret = ASQ_CTRL_INVALID_ATTRIBUTE_SYNTAX;
 271                         return asq_terminate(handle);
 272                 }
 273                 ac->reqs[i]->op.search.scope = LDB_SCOPE_BASE;
 274                 ac->reqs[i]->op.search.tree = ac->base_req->op.search.tree;
 275                 ac->reqs[i]->op.search.attrs = ac->req_attrs;
 276
 277                 ac->reqs[i]->context = ac;
 278                 ac->reqs[i]->callback = asq_reqs_callback;
 279                 ldb_set_timeout_from_prev_req(ac->module->ldb, ac->base_req, ac->reqs[i]);
 280         }
 281
 282         return LDB_SUCCESS;
 283 }
 284
 285 static int asq_search_continue(struct ldb_handle *handle)
 286 {
 287         struct asq_context *ac;
 288         int ret;
 289
 290         if (!handle || !handle->private_data) {
 291                 return LDB_ERR_OPERATIONS_ERROR;
 292         }
 293
 294         if (handle->state == LDB_ASYNC_DONE) {
 295                 return handle->status;
 296         }
 297
 298         ac = talloc_get_type(handle->private_data, struct asq_context);
 299         if (ac == NULL) {
 300                 return LDB_ERR_OPERATIONS_ERROR;
 301         }
 302
 303         switch (ac->step) {
 304         case ASQ_INIT:
 305                 /* check the search is well formed */
 306                 if (ac->orig_req->op.search.scope != LDB_SCOPE_BASE) {
 307                         ac->asq_ret = ASQ_CTRL_UNWILLING_TO_PERFORM;
 308                         return asq_terminate(handle);
 309                 }
 310
 311                 ac->req_attrs = ac->orig_req->op.search.attrs;
 312                 ac->req_attribute = talloc_strdup(ac, ac->asq_ctrl->source_attribute);
 313                 if (ac->req_attribute == NULL)
 314                         return LDB_ERR_OPERATIONS_ERROR;
 315
 316                 /* get the object to retrieve the DNs to search */
 317                 ret = asq_build_first_request(ac);
 318                 if (ret != LDB_SUCCESS) {
 319                         return ret;
 320                 }
 321
 322                 ac->step = ASQ_SEARCH_BASE;
 323
 324                 handle->state = LDB_ASYNC_PENDING;
 325                 handle->status = LDB_SUCCESS;
 326
 327                 return ldb_request(ac->module->ldb, ac->base_req);
 328
 329         case ASQ_SEARCH_BASE:
 330
 331                 ret = ldb_wait(ac->base_req->handle, LDB_WAIT_NONE);
 332
 333                 if (ret != LDB_SUCCESS) {
 334                         handle->status = ret;
 335                         goto done;
 336                 }
 337
 338                 if (ac->base_req->handle->status != LDB_SUCCESS) {
 339                         handle->status = ac->base_req->handle->status;
 340                         goto done;
 341                 }
 342
 343                 if (ac->base_req->handle->state == LDB_ASYNC_DONE) {
 344
 345                         /* build up the requests call chain */
 346                         ret = asq_build_multiple_requests(ac, handle);
 347                         if (ret != LDB_SUCCESS) {
 348                                 return ret;
 349                         }
 350                         if (handle->state == LDB_ASYNC_DONE) {
 351                                 return LDB_SUCCESS;
 352                         }
 353
 354                         ac->step = ASQ_SEARCH_MULTI;
 355
 356                         return ldb_request(ac->module->ldb, ac->reqs[ac->cur_req]);
 357                 }
 358
 359                 /* request still pending, return to cycle again */
 360                 return LDB_SUCCESS;
 361
 362         case ASQ_SEARCH_MULTI:
 363
 364                 ret = ldb_wait(ac->reqs[ac->cur_req]->handle, LDB_WAIT_NONE);
 365
 366                 if (ret != LDB_SUCCESS) {
 367                         handle->status = ret;
 368                         goto done;
 369                 }
 370                 if (ac->reqs[ac->cur_req]->handle->status != LDB_SUCCESS) {
 371                         handle->status = ac->reqs[ac->cur_req]->handle->status;
 372                 }
 373
 374                 if (ac->reqs[ac->cur_req]->handle->state == LDB_ASYNC_DONE) {
 375                         ac->cur_req++;
 376
 377                         if (ac->cur_req < ac->num_reqs) {
 378                                 return ldb_request(ac->module->ldb, ac->reqs[ac->cur_req]);
 379                         }
 380
 381                         return asq_terminate(handle);
 382                 }
 383
 384                 /* request still pending, return to cycle again */
 385                 return LDB_SUCCESS;
 386
 387         default:
 388                 ret = LDB_ERR_OPERATIONS_ERROR;
 389                 break;
 390         }
 391
 392 done:
 393         handle->state = LDB_ASYNC_DONE;
 394         return ret;
 395 }
 396
 397 static int asq_search(struct ldb_module *module, struct ldb_request *req)
 398 {
 399         struct ldb_control *control;
 400         struct asq_context *ac;
 401         struct ldb_handle *h;
 402
 403         /* check if there's a paged request control */
 404         control = ldb_request_get_control(req, LDB_CONTROL_ASQ_OID);
 405         if (control == NULL) {
 406                 /* not found go on */
 407                 return ldb_next_request(module, req);
 408         }
 409
 410         req->handle = NULL;
 411
 412         if (!req->callback || !req->context) {
 413                 ldb_set_errstring(module->ldb,
 414                                   "Async interface called with NULL callback function or NULL context");
 415                 return LDB_ERR_OPERATIONS_ERROR;
 416         }
 417
 418         h = init_handle(req, module);
 419         if (!h) {
 420                 return LDB_ERR_OPERATIONS_ERROR;
 421         }
 422         ac = talloc_get_type(h->private_data, struct asq_context);
 423
 424         ac->asq_ctrl = talloc_get_type(control->data, struct ldb_asq_control);
 425         if (!ac->asq_ctrl) {
 426                 return LDB_ERR_PROTOCOL_ERROR;
 427         }
 428
 429         req->handle = h;
 430
 431         return asq_search_continue(h);
 432 }
 433
 434 static int asq_wait_all(struct ldb_handle *handle)
 435 {
 436         int ret;
 437
 438         while (handle->state != LDB_ASYNC_DONE) {
 439                 ret = asq_search_continue(handle);
 440                 if (ret != LDB_SUCCESS) {
 441                         return ret;
 442                 }
 443         }
 444
 445         return handle->status;
 446 }
 447
 448 static int asq_wait(struct ldb_handle *handle, enum ldb_wait_type type)
 449 {
 450         if (type == LDB_WAIT_ALL) {
 451                 return asq_wait_all(handle);
 452         } else {
 453                 return asq_search_continue(handle);
 454         }
 455 }
 456
 457 static int asq_init(struct ldb_module *module)
 458 {
 459         struct ldb_request *req;
 460         int ret;
 461
 462         req = talloc_zero(module, struct ldb_request);
 463         if (req == NULL) {
 464                 ldb_debug(module->ldb, LDB_DEBUG_ERROR, "asq: Out of memory!\n");
 465                 return LDB_ERR_OPERATIONS_ERROR;
 466         }
 467
 468         req->operation = LDB_REQ_REGISTER_CONTROL;
 469         req->op.reg_control.oid = LDB_CONTROL_ASQ_OID;
 470
 471         ret = ldb_request(module->ldb, req);
 472         if (ret != LDB_SUCCESS) {
 473                 ldb_debug(module->ldb, LDB_DEBUG_WARNING, "asq: Unable to register control with rootdse!\n");
 474         }
 475
 476         return ldb_next_init(module);
 477 }
 478
 479
 480 static const struct ldb_module_ops asq_ops = {
 481         .name              = "asq",
 482         .search            = asq_search,
 483         .wait              = asq_wait,
 484         .init_context      = asq_init
 485 };
 486
 487 int ldb_asq_init(void)
 488 {
 489         return ldb_register_module(&asq_ops);
 490 }