git.sur5r.net Git - openldap/blob - servers/slapd/overlays/pcache.c

   1 /* $OpenLDAP$ */
   2 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
   3  *
   4  * Copyright 2003-2006 The OpenLDAP Foundation.
   5  * Portions Copyright 2003 IBM Corporation.
   6  * Portions Copyright 2003 Symas Corporation.
   7  * All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted only as authorized by the OpenLDAP
  11  * Public License.
  12  *
  13  * A copy of this license is available in the file LICENSE in the
  14  * top-level directory of the distribution or, alternatively, at
  15  * <http://www.OpenLDAP.org/license.html>.
  16  */
  17 /* ACKNOWLEDGEMENTS:
  18  * This work was initially developed by Apurva Kumar for inclusion
  19  * in OpenLDAP Software and subsequently rewritten by Howard Chu.
  20  */
  21
  22 #include "portable.h"
  23
  24 #ifdef SLAPD_OVER_PROXYCACHE
  25
  26 #include <stdio.h>
  27
  28 #include <ac/string.h>
  29 #include <ac/time.h>
  30
  31 #include "slap.h"
  32 #include "lutil.h"
  33 #include "ldap_rq.h"
  34
  35 #include "config.h"
  36
  37 /* query cache structs */
  38 /* query */
  39
  40 typedef struct Query_s {
  41         Filter*         filter;         /* Search Filter */
  42         AttributeName*  attrs;          /* Projected attributes */
  43         AttributeName*  save_attrs;     /* original attributes, saved for response */
  44         struct berval   base;           /* Search Base */
  45         int             scope;          /* Search scope */
  46 } Query;
  47
  48 /* struct representing a cached query */
  49 typedef struct cached_query_s {
  50         Query                           query;          /* LDAP query */
  51         struct berval                   q_uuid;         /* query identifier */
  52         int                             template_id;    /* template of the query */
  53         time_t                          expiry_time;    /* time till the query is considered valid */
  54         struct cached_query_s           *next;          /* next query in the template */
  55         struct cached_query_s           *prev;          /* previous query in the template */
  56         struct cached_query_s           *lru_up;        /* previous query in the LRU list */
  57         struct cached_query_s           *lru_down;      /* next query in the LRU list */
  58 } CachedQuery;
  59
  60 /* struct representing a query template
  61  * e.g. template string = &(cn=)(mail=)
  62  */
  63 typedef struct query_template_s {
  64         struct berval   querystr;       /* Filter string corresponding to the QT */
  65         int             attr_set_index; /* determines the projected attributes */
  66
  67         CachedQuery*    query;          /* most recent query cached for the template */
  68         CachedQuery*    query_last;     /* oldest query cached for the template */
  69
  70         int             no_of_queries;  /* Total number of queries in the template */
  71         time_t          ttl;            /* TTL for the queries of this template */
  72         ldap_pvt_thread_rdwr_t t_rwlock; /* Rd/wr lock for accessing queries in the template */
  73 } QueryTemplate;
  74
  75 /*
  76  * Represents a set of projected attributes.
  77  */
  78
  79 struct attr_set {
  80         unsigned        flags;
  81 #define PC_CONFIGURED   (0x1)
  82 #define PC_REFERENCED   (0x2)
  83 #define PC_GOT_OC               (0x4)
  84         AttributeName*  attrs;          /* specifies the set */
  85         int             count;          /* number of attributes */
  86 };
  87
  88 struct query_manager_s;
  89
  90 /* prototypes for functions for 1) query containment
  91  * 2) query addition, 3) cache replacement
  92  */
  93 typedef int     (QCfunc)(Operation *op, struct query_manager_s*, Query*, int );
  94 typedef void    (AddQueryfunc)(struct query_manager_s*, Query*, int, struct berval*);
  95 typedef void    (CRfunc)(struct query_manager_s*, struct berval * );
  96
  97 /* LDAP query cache */
  98 typedef struct query_manager_s {
  99         struct attr_set*        attr_sets;              /* possible sets of projected attributes */
 100         QueryTemplate*          templates;              /* cacheable templates */
 101
 102         CachedQuery*            lru_top;                /* top and bottom of LRU list */
 103         CachedQuery*            lru_bottom;
 104
 105         ldap_pvt_thread_mutex_t         lru_mutex;      /* mutex for accessing LRU list */
 106
 107         /* Query cache methods */
 108         QCfunc                  *qcfunc;                        /* Query containment*/
 109         CRfunc                  *crfunc;                        /* cache replacement */
 110         AddQueryfunc    *addfunc;                       /* add query */
 111 } query_manager;
 112
 113 /* LDAP query cache manager */
 114 typedef struct cache_manager_s {
 115         BackendDB       db;     /* underlying database */
 116         unsigned long   num_cached_queries;             /* total number of cached queries */
 117         unsigned long   max_queries;                    /* upper bound on # of cached queries */
 118         int     numattrsets;                    /* number of attribute sets */
 119         int     numtemplates;                   /* number of cacheable templates */
 120         int     cur_entries;                    /* current number of entries cached */
 121         int     max_entries;                    /* max number of entries cached */
 122         int     num_entries_limit;              /* max # of entries in a cacheable query */
 123
 124         char    response_cb;                    /* install the response callback
 125                                                  * at the tail of the callback list */
 126 #define PCACHE_RESPONSE_CB_HEAD 0
 127 #define PCACHE_RESPONSE_CB_TAIL 1
 128
 129         time_t  cc_period;              /* interval between successive consistency checks (sec) */
 130         int     cc_paused;
 131         void    *cc_arg;
 132
 133         ldap_pvt_thread_mutex_t         cache_mutex;
 134         ldap_pvt_thread_mutex_t         remove_mutex;
 135
 136         query_manager*   qm;    /* query cache managed by the cache manager */
 137 } cache_manager;
 138
 139 static AttributeDescription *ad_queryid;
 140 static char *queryid_schema = "( 1.3.6.1.4.1.4203.666.1.12 NAME 'queryid' "
 141                         "DESC 'list of queries the entry belongs to' "
 142                         "EQUALITY octetStringMatch "
 143                         "SYNTAX 1.3.6.1.4.1.1466.115.121.1.40{64} "
 144                         "NO-USER-MODIFICATION USAGE directoryOperation )";
 145
 146 /* Return 1 for an added entry, else 0 */
 147 static int
 148 merge_entry(
 149         Operation               *op,
 150         Entry                   *e,
 151         struct berval*          query_uuid )
 152 {
 153         int             rc;
 154         Modifications* modlist = NULL;
 155         const char*     text = NULL;
 156         Attribute               *attr;
 157         char                    textbuf[SLAP_TEXT_BUFLEN];
 158         size_t                  textlen = sizeof(textbuf);
 159
 160         SlapReply sreply = {REP_RESULT};
 161
 162         slap_callback cb = { NULL, slap_null_cb, NULL, NULL };
 163
 164         attr = e->e_attrs;
 165         e->e_attrs = NULL;
 166
 167         /* add queryid attribute */
 168         attr_merge_one( e, ad_queryid, query_uuid, NULL );
 169
 170         /* append the attribute list from the fetched entry */
 171         e->e_attrs->a_next = attr;
 172
 173         op->o_tag = LDAP_REQ_ADD;
 174         op->o_protocol = LDAP_VERSION3;
 175         op->o_callback = &cb;
 176         op->o_time = slap_get_time();
 177         op->o_do_not_cache = 1;
 178
 179         op->ora_e = e;
 180         op->o_req_dn = e->e_name;
 181         op->o_req_ndn = e->e_nname;
 182         rc = op->o_bd->be_add( op, &sreply );
 183
 184         if ( rc != LDAP_SUCCESS ) {
 185                 if ( rc == LDAP_ALREADY_EXISTS ) {
 186                         slap_entry2mods( e, &modlist, &text, textbuf, textlen );
 187                         modlist->sml_op = LDAP_MOD_ADD;
 188                         op->o_tag = LDAP_REQ_MODIFY;
 189                         op->orm_modlist = modlist;
 190                         op->o_bd->be_modify( op, &sreply );
 191                         slap_mods_free( modlist, 1 );
 192                 } else if ( rc == LDAP_REFERRAL ||
 193                                         rc == LDAP_NO_SUCH_OBJECT ) {
 194                         syncrepl_add_glue( op, e );
 195                         e = NULL;
 196                         rc = 1;
 197                 }
 198                 if ( e ) {
 199                         entry_free( e );
 200                         rc = 0;
 201                 }
 202         } else {
 203                 be_entry_release_w( op, e );
 204                 rc = 1;
 205         }
 206
 207         return rc;
 208 }
 209
 210 /* compare base and scope of incoming and cached queries */
 211 static int base_scope_compare(
 212         struct berval* ndn_stored,
 213         struct berval* ndn_incoming,
 214         int scope_stored,
 215         int scope_incoming      )
 216 {
 217         struct berval pdn_incoming = BER_BVNULL;
 218
 219         if (scope_stored < scope_incoming)
 220                 return 0;
 221
 222         if ( !dnIsSuffix(ndn_incoming, ndn_stored))
 223                 return 0;
 224
 225         switch(scope_stored) {
 226         case LDAP_SCOPE_BASE:
 227                 return (ndn_incoming->bv_len == ndn_stored->bv_len);
 228
 229         case LDAP_SCOPE_ONELEVEL:
 230                 switch(scope_incoming){
 231                 case LDAP_SCOPE_BASE:
 232                         dnParent(ndn_incoming, &pdn_incoming);
 233                         return (pdn_incoming.bv_len == ndn_stored->bv_len);
 234
 235                 case LDAP_SCOPE_ONELEVEL:
 236                         return (ndn_incoming->bv_len == ndn_stored->bv_len);
 237
 238                 default:
 239                         return 0;
 240                 }
 241         case LDAP_SCOPE_SUBTREE:
 242                 return 1;
 243                 break;
 244         default:
 245                 return 0;
 246                 break;
 247     }
 248 }
 249
 250 /* add query on top of LRU list */
 251 static void
 252 add_query_on_top (query_manager* qm, CachedQuery* qc)
 253 {
 254         CachedQuery* top = qm->lru_top;
 255         Query* q = (Query*)qc;
 256
 257         qm->lru_top = qc;
 258
 259         if (top)
 260                 top->lru_up = qc;
 261         else
 262                 qm->lru_bottom = qc;
 263
 264         qc->lru_down = top;
 265         qc->lru_up = NULL;
 266         Debug( LDAP_DEBUG_TRACE, "Base of added query = %s\n",
 267                         q->base.bv_val, 0, 0 );
 268 }
 269
 270 /* remove_query from LRU list */
 271
 272 static void
 273 remove_query (query_manager* qm, CachedQuery* qc)
 274 {
 275         CachedQuery* up;
 276         CachedQuery* down;
 277
 278         if (!qc)
 279                 return;
 280
 281         up = qc->lru_up;
 282         down = qc->lru_down;
 283
 284         if (!up)
 285                 qm->lru_top = down;
 286
 287         if (!down)
 288                 qm->lru_bottom = up;
 289
 290         if (down)
 291                 down->lru_up = up;
 292
 293         if (up)
 294                 up->lru_down = down;
 295
 296         qc->lru_up = qc->lru_down = NULL;
 297 }
 298
 299 /* find and remove string2 from string1
 300  * from start if position = 1,
 301  * from end if position = 3,
 302  * from anywhere if position = 2
 303  * string1 is overwritten if position = 2.
 304  */
 305
 306 static int
 307 find_and_remove(struct berval* ber1, struct berval* ber2, int position)
 308 {
 309         int ret=0;
 310
 311         if ( !ber2->bv_val )
 312                 return 1;
 313         if ( !ber1->bv_val )
 314                 return 0;
 315
 316         switch( position ) {
 317         case 1:
 318                 if ( ber1->bv_len >= ber2->bv_len && !memcmp( ber1->bv_val,
 319                         ber2->bv_val, ber2->bv_len )) {
 320                         ret = 1;
 321                         ber1->bv_val += ber2->bv_len;
 322                         ber1->bv_len -= ber2->bv_len;
 323                 }
 324                 break;
 325         case 2: {
 326                 char *temp;
 327                 ber1->bv_val[ber1->bv_len] = '\0';
 328                 temp = strstr( ber1->bv_val, ber2->bv_val );
 329                 if ( temp ) {
 330                         strcpy( temp, temp+ber2->bv_len );
 331                         ber1->bv_len -= ber2->bv_len;
 332                         ret = 1;
 333                 }
 334                 break;
 335                 }
 336         case 3:
 337                 if ( ber1->bv_len >= ber2->bv_len &&
 338                         !memcmp( ber1->bv_val+ber1->bv_len-ber2->bv_len, ber2->bv_val,
 339                                 ber2->bv_len )) {
 340                         ret = 1;
 341                         ber1->bv_len -= ber2->bv_len;
 342                 }
 343                 break;
 344         }
 345         return ret;
 346 }
 347
 348
 349 static struct berval*
 350 merge_init_final(Operation *op, struct berval* init, struct berval* any,
 351         struct berval* final)
 352 {
 353         struct berval* merged, *temp;
 354         int i, any_count, count;
 355
 356         for (any_count=0; any && any[any_count].bv_val; any_count++)
 357                 ;
 358
 359         count = any_count;
 360
 361         if (init->bv_val)
 362                 count++;
 363         if (final->bv_val)
 364                 count++;
 365
 366         merged = (struct berval*)op->o_tmpalloc( (count+1)*sizeof(struct berval),
 367                 op->o_tmpmemctx );
 368         temp = merged;
 369
 370         if (init->bv_val) {
 371                 ber_dupbv_x( temp, init, op->o_tmpmemctx );
 372                 temp++;
 373         }
 374
 375         for (i=0; i<any_count; i++) {
 376                 ber_dupbv_x( temp, any, op->o_tmpmemctx );
 377                 temp++; any++;
 378         }
 379
 380         if (final->bv_val){
 381                 ber_dupbv_x( temp, final, op->o_tmpmemctx );
 382                 temp++;
 383         }
 384         BER_BVZERO( temp );
 385         return merged;
 386 }
 387
 388 /* Each element in stored must be found in incoming. Incoming is overwritten.
 389  */
 390 static int
 391 strings_containment(struct berval* stored, struct berval* incoming)
 392 {
 393         struct berval* element;
 394         int k=0;
 395         int j, rc = 0;
 396
 397         for ( element=stored; element->bv_val != NULL; element++ ) {
 398                 for (j = k; incoming[j].bv_val != NULL; j++) {
 399                         if (find_and_remove(&(incoming[j]), element, 2)) {
 400                                 k = j;
 401                                 rc = 1;
 402                                 break;
 403                         }
 404                         rc = 0;
 405                 }
 406                 if ( rc ) {
 407                         continue;
 408                 } else {
 409                         return 0;
 410                 }
 411         }
 412         return 1;
 413 }
 414
 415 static int
 416 substr_containment_substr(Operation *op, Filter* stored, Filter* incoming)
 417 {
 418         int i;
 419         int rc = 0;
 420
 421         struct berval init_incoming;
 422         struct berval final_incoming;
 423         struct berval *remaining_incoming = NULL;
 424
 425         if ((!(incoming->f_sub_initial.bv_val) && (stored->f_sub_initial.bv_val))
 426            || (!(incoming->f_sub_final.bv_val) && (stored->f_sub_final.bv_val)))
 427                 return 0;
 428
 429         init_incoming = incoming->f_sub_initial;
 430         final_incoming =  incoming->f_sub_final;
 431
 432         if (find_and_remove(&init_incoming,
 433                         &(stored->f_sub_initial), 1) && find_and_remove(&final_incoming,
 434                         &(stored->f_sub_final), 3))
 435         {
 436                 if (stored->f_sub_any == NULL) {
 437                         rc = 1;
 438                         goto final;
 439                 }
 440                 remaining_incoming = merge_init_final(op, &init_incoming,
 441                                                 incoming->f_sub_any, &final_incoming);
 442                 rc = strings_containment(stored->f_sub_any, remaining_incoming);
 443                 ber_bvarray_free_x( remaining_incoming, op->o_tmpmemctx );
 444         }
 445 final:
 446         return rc;
 447 }
 448
 449 static int
 450 substr_containment_equality(Operation *op, Filter* stored, Filter* incoming)
 451 {
 452         struct berval incoming_val[2];
 453         int rc = 0;
 454
 455         incoming_val[1] = incoming->f_av_value;
 456
 457         if (find_and_remove(incoming_val+1,
 458                         &(stored->f_sub_initial), 1) && find_and_remove(incoming_val+1,
 459                         &(stored->f_sub_final), 3)) {
 460                 if (stored->f_sub_any == NULL){
 461                         rc = 1;
 462                         goto final;
 463                 }
 464                 ber_dupbv_x( incoming_val, incoming_val+1, op->o_tmpmemctx );
 465                 BER_BVZERO( incoming_val+1 );
 466                 rc = strings_containment(stored->f_sub_any, incoming_val);
 467                 op->o_tmpfree( incoming_val[0].bv_val, op->o_tmpmemctx );
 468         }
 469 final:
 470         return rc;
 471 }
 472
 473 /* check whether query is contained in any of
 474  * the cached queries in template template_index
 475  */
 476 static int
 477 query_containment(Operation *op, query_manager *qm,
 478                   Query *query,
 479                   int template_index)
 480 {
 481         QueryTemplate* templa= qm->templates;
 482         CachedQuery* qc;
 483         Query* q;
 484         Filter* inputf = query->filter;
 485         struct berval* base = &(query->base);
 486         int scope = query->scope;
 487         int res=0;
 488         Filter* fs;
 489         Filter* fi;
 490         int ret, rc;
 491         const char* text;
 492
 493         MatchingRule* mrule = NULL;
 494         if (inputf != NULL) {
 495                 Debug( LDAP_DEBUG_TRACE, "Lock QC index = %d\n",
 496                                 template_index, 0, 0 );
 497                 ldap_pvt_thread_rdwr_rlock(&(templa[template_index].t_rwlock));
 498                 for(qc=templa[template_index].query; qc != NULL; qc= qc->next) {
 499                         q = (Query*)qc;
 500                         if(base_scope_compare(&(q->base), base, q->scope, scope)) {
 501                                 fi = inputf;
 502                                 fs = q->filter;
 503                                 do {
 504                                         res=0;
 505                                         switch (fs->f_choice) {
 506                                         case LDAP_FILTER_EQUALITY:
 507                                                 if (fi->f_choice == LDAP_FILTER_EQUALITY)
 508                                                         mrule = fs->f_ava->aa_desc->ad_type->sat_equality;
 509                                                 else
 510                                                         ret = 1;
 511                                                 break;
 512                                         case LDAP_FILTER_GE:
 513                                         case LDAP_FILTER_LE:
 514                                                 mrule = fs->f_ava->aa_desc->ad_type->sat_ordering;
 515                                                 break;
 516                                         default:
 517                                                 mrule = NULL;
 518                                         }
 519                                         if (mrule) {
 520                                                 rc = value_match(&ret, fs->f_ava->aa_desc, mrule,
 521                                                         SLAP_MR_VALUE_OF_ASSERTION_SYNTAX,
 522                                                         &(fi->f_ava->aa_value),
 523                                                         &(fs->f_ava->aa_value), &text);
 524                                                 if (rc != LDAP_SUCCESS) {
 525                                                         ldap_pvt_thread_rdwr_runlock(&(templa[template_index].t_rwlock));
 526                                                         Debug( LDAP_DEBUG_TRACE,
 527                                                         "Unlock: Exiting QC index=%d\n",
 528                                                         template_index, 0, 0 );
 529                                                         return 0;
 530                                                 }
 531                                         }
 532                                         switch (fs->f_choice) {
 533                                         case LDAP_FILTER_OR:
 534                                         case LDAP_FILTER_AND:
 535                                                 fs = fs->f_and;
 536                                                 fi = fi->f_and;
 537                                                 res=1;
 538                                                 break;
 539                                         case LDAP_FILTER_SUBSTRINGS:
 540                                                 /* check if the equality query can be
 541                                                 * answered with cached substring query */
 542                                                 if ((fi->f_choice == LDAP_FILTER_EQUALITY)
 543                                                         && substr_containment_equality( op,
 544                                                         fs, fi))
 545                                                         res=1;
 546                                                 /* check if the substring query can be
 547                                                 * answered with cached substring query */
 548                                                 if ((fi->f_choice ==LDAP_FILTER_SUBSTRINGS
 549                                                         ) && substr_containment_substr( op,
 550                                                         fs, fi))
 551                                                         res= 1;
 552                                                 fs=fs->f_next;
 553                                                 fi=fi->f_next;
 554                                                 break;
 555                                         case LDAP_FILTER_PRESENT:
 556                                                 res=1;
 557                                                 fs=fs->f_next;
 558                                                 fi=fi->f_next;
 559                                                 break;
 560                                         case LDAP_FILTER_EQUALITY:
 561                                                 if (ret == 0)
 562                                                         res = 1;
 563                                                 fs=fs->f_next;
 564                                                 fi=fi->f_next;
 565                                                 break;
 566                                         case LDAP_FILTER_GE:
 567                                                 if (ret >= 0)
 568                                                         res = 1;
 569                                                 fs=fs->f_next;
 570                                                 fi=fi->f_next;
 571                                                 break;
 572                                         case LDAP_FILTER_LE:
 573                                                 if (ret <= 0)
 574                                                         res = 1;
 575                                                 fs=fs->f_next;
 576                                                 fi=fi->f_next;
 577                                                 break;
 578                                         case LDAP_FILTER_NOT:
 579                                                 res=0;
 580                                                 break;
 581                                         default:
 582                                                 break;
 583                                         }
 584                                 } while((res) && (fi != NULL) && (fs != NULL));
 585
 586                                 if(res) {
 587                                         ldap_pvt_thread_mutex_lock(&qm->lru_mutex);
 588                                         if (qm->lru_top != qc) {
 589                                                 remove_query(qm, qc);
 590                                                 add_query_on_top(qm, qc);
 591                                         }
 592                                         ldap_pvt_thread_mutex_unlock(&qm->lru_mutex);
 593                                         return 1;
 594                                 }
 595                         }
 596                 }
 597                 Debug( LDAP_DEBUG_TRACE,
 598                         "Not answerable: Unlock QC index=%d\n",
 599                         template_index, 0, 0 );
 600                 ldap_pvt_thread_rdwr_runlock(&(templa[template_index].t_rwlock));
 601         }
 602         return 0;
 603 }
 604
 605 static void
 606 free_query (CachedQuery* qc)
 607 {
 608         Query* q = (Query*)qc;
 609         int i;
 610
 611         free(qc->q_uuid.bv_val);
 612         filter_free(q->filter);
 613         free (q->base.bv_val);
 614         free(q->attrs);
 615         free(qc);
 616 }
 617
 618
 619 /* Add query to query cache */
 620 static void add_query(
 621         query_manager* qm,
 622         Query* query,
 623         int template_index,
 624         struct berval* uuid)
 625 {
 626         CachedQuery* new_cached_query = (CachedQuery*) ch_malloc(sizeof(CachedQuery));
 627         QueryTemplate* templ = (qm->templates)+template_index;
 628         Query* new_query;
 629         new_cached_query->template_id = template_index;
 630         new_cached_query->q_uuid = *uuid;
 631         new_cached_query->lru_up = NULL;
 632         new_cached_query->lru_down = NULL;
 633         new_cached_query->expiry_time = slap_get_time() + templ->ttl;
 634         Debug( LDAP_DEBUG_TRACE, "Added query expires at %ld\n",
 635                         (long) new_cached_query->expiry_time, 0, 0 );
 636         new_query = (Query*)new_cached_query;
 637
 638         ber_dupbv(&new_query->base, &query->base);
 639         new_query->scope = query->scope;
 640         new_query->filter = query->filter;
 641         new_query->attrs = query->attrs;
 642
 643         /* Adding a query    */
 644         Debug( LDAP_DEBUG_TRACE, "Lock AQ index = %d\n",
 645                         template_index, 0, 0 );
 646         ldap_pvt_thread_rdwr_wlock(&templ->t_rwlock);
 647         if (templ->query == NULL)
 648                 templ->query_last = new_cached_query;
 649         else
 650                 templ->query->prev = new_cached_query;
 651         new_cached_query->next = templ->query;
 652         new_cached_query->prev = NULL;
 653         templ->query = new_cached_query;
 654         templ->no_of_queries++;
 655         Debug( LDAP_DEBUG_TRACE, "TEMPLATE %d QUERIES++ %d\n",
 656                         template_index, templ->no_of_queries, 0 );
 657
 658         Debug( LDAP_DEBUG_TRACE, "Unlock AQ index = %d \n",
 659                         template_index, 0, 0 );
 660         ldap_pvt_thread_rdwr_wunlock(&templ->t_rwlock);
 661
 662         /* Adding on top of LRU list  */
 663         ldap_pvt_thread_mutex_lock(&qm->lru_mutex);
 664         add_query_on_top(qm, new_cached_query);
 665         ldap_pvt_thread_mutex_unlock(&qm->lru_mutex);
 666 }
 667
 668 static void
 669 remove_from_template (CachedQuery* qc, QueryTemplate* template)
 670 {
 671         if (!qc->prev && !qc->next) {
 672                 template->query_last = template->query = NULL;
 673         } else if (qc->prev == NULL) {
 674                 qc->next->prev = NULL;
 675                 template->query = qc->next;
 676         } else if (qc->next == NULL) {
 677                 qc->prev->next = NULL;
 678                 template->query_last = qc->prev;
 679         } else {
 680                 qc->next->prev = qc->prev;
 681                 qc->prev->next = qc->next;
 682         }
 683
 684         template->no_of_queries--;
 685 }
 686
 687 /* remove bottom query of LRU list from the query cache */
 688 static void cache_replacement(query_manager* qm, struct berval *result)
 689 {
 690         CachedQuery* bottom;
 691         int temp_id;
 692
 693         ldap_pvt_thread_mutex_lock(&qm->lru_mutex);
 694         bottom = qm->lru_bottom;
 695
 696         result->bv_val = NULL;
 697         result->bv_len = 0;
 698
 699         if (!bottom) {
 700                 Debug ( LDAP_DEBUG_TRACE,
 701                         "Cache replacement invoked without "
 702                         "any query in LRU list\n", 0, 0, 0 );
 703                 ldap_pvt_thread_mutex_unlock(&qm->lru_mutex);
 704                 return;
 705         }
 706
 707         temp_id = bottom->template_id;
 708         remove_query(qm, bottom);
 709         ldap_pvt_thread_mutex_unlock(&qm->lru_mutex);
 710
 711         *result = bottom->q_uuid;
 712         bottom->q_uuid.bv_val = NULL;
 713
 714         Debug( LDAP_DEBUG_TRACE, "Lock CR index = %d\n", temp_id, 0, 0 );
 715         ldap_pvt_thread_rdwr_wlock(&(qm->templates[temp_id].t_rwlock));
 716         remove_from_template(bottom, (qm->templates+temp_id));
 717         Debug( LDAP_DEBUG_TRACE, "TEMPLATE %d QUERIES-- %d\n",
 718                 temp_id, qm->templates[temp_id].no_of_queries, 0 );
 719         Debug( LDAP_DEBUG_TRACE, "Unlock CR index = %d\n", temp_id, 0, 0 );
 720         ldap_pvt_thread_rdwr_wunlock(&(qm->templates[temp_id].t_rwlock));
 721         free_query(bottom);
 722 }
 723
 724 struct query_info {
 725         struct query_info *next;
 726         struct berval xdn;
 727         int del;
 728 };
 729
 730 static int
 731 remove_func (
 732         Operation       *op,
 733         SlapReply       *rs
 734 )
 735 {
 736         Attribute *attr;
 737         struct query_info *qi;
 738         int count = 0;
 739
 740         if ( rs->sr_type != REP_SEARCH ) return 0;
 741
 742         for (attr = rs->sr_entry->e_attrs; attr!= NULL; attr = attr->a_next) {
 743                 if (attr->a_desc == ad_queryid) {
 744                         for (count=0; attr->a_vals[count].bv_val; count++)
 745                                 ;
 746                         break;
 747                 }
 748         }
 749         if ( count == 0 ) return 0;
 750         qi = op->o_tmpalloc( sizeof( struct query_info ), op->o_tmpmemctx );
 751         qi->next = op->o_callback->sc_private;
 752         op->o_callback->sc_private = qi;
 753         ber_dupbv_x( &qi->xdn, &rs->sr_entry->e_nname, op->o_tmpmemctx );
 754         qi->del = ( count == 1 );
 755
 756         return 0;
 757 }
 758
 759 static int
 760 remove_query_data (
 761         Operation       *op,
 762         SlapReply       *rs,
 763         struct berval* query_uuid)
 764 {
 765         struct query_info       *qi, *qnext;
 766         char                    filter_str[64];
 767 #ifdef LDAP_COMP_MATCH
 768         AttributeAssertion      ava = { NULL, BER_BVNULL, NULL };
 769 #else
 770         AttributeAssertion      ava = { NULL, BER_BVNULL };
 771 #endif
 772         Filter                  filter = {LDAP_FILTER_EQUALITY};
 773         SlapReply               sreply = {REP_RESULT};
 774         slap_callback cb = { NULL, remove_func, NULL, NULL };
 775         int deleted = 0;
 776
 777         sreply.sr_entry = NULL;
 778         sreply.sr_nentries = 0;
 779         op->ors_filterstr.bv_len = snprintf(filter_str, sizeof(filter_str),
 780                 "(%s=%s)", ad_queryid->ad_cname.bv_val, query_uuid->bv_val);
 781         filter.f_ava = &ava;
 782         filter.f_av_desc = ad_queryid;
 783         filter.f_av_value = *query_uuid;
 784
 785         op->o_tag = LDAP_REQ_SEARCH;
 786         op->o_protocol = LDAP_VERSION3;
 787         op->o_callback = &cb;
 788         op->o_time = slap_get_time();
 789         op->o_do_not_cache = 1;
 790
 791         op->o_req_dn = op->o_bd->be_suffix[0];
 792         op->o_req_ndn = op->o_bd->be_nsuffix[0];
 793         op->ors_scope = LDAP_SCOPE_SUBTREE;
 794         op->ors_deref = LDAP_DEREF_NEVER;
 795         op->ors_slimit = SLAP_NO_LIMIT;
 796         op->ors_tlimit = SLAP_NO_LIMIT;
 797         op->ors_filter = &filter;
 798         op->ors_filterstr.bv_val = filter_str;
 799         op->ors_filterstr.bv_len = strlen(filter_str);
 800         op->ors_attrs = NULL;
 801         op->ors_attrsonly = 0;
 802
 803         op->o_bd->be_search( op, &sreply );
 804
 805         for ( qi=cb.sc_private; qi; qi=qnext ) {
 806                 qnext = qi->next;
 807
 808                 op->o_req_dn = qi->xdn;
 809                 op->o_req_ndn = qi->xdn;
 810
 811                 if ( qi->del) {
 812                         Debug( LDAP_DEBUG_TRACE, "DELETING ENTRY TEMPLATE=%s\n",
 813                                 query_uuid->bv_val, 0, 0 );
 814
 815                         op->o_tag = LDAP_REQ_DELETE;
 816
 817                         if (op->o_bd->be_delete(op, &sreply) == LDAP_SUCCESS) {
 818                                 deleted++;
 819                         }
 820                 } else {
 821                         Modifications mod;
 822                         struct berval vals[2];
 823
 824                         vals[0] = *query_uuid;
 825                         vals[1].bv_val = NULL;
 826                         vals[1].bv_len = 0;
 827                         mod.sml_op = LDAP_MOD_DELETE;
 828                         mod.sml_flags = 0;
 829                         mod.sml_desc = ad_queryid;
 830                         mod.sml_type = ad_queryid->ad_cname;
 831                         mod.sml_values = vals;
 832                         mod.sml_nvalues = NULL;
 833                         mod.sml_next = NULL;
 834                         Debug( LDAP_DEBUG_TRACE,
 835                                 "REMOVING TEMP ATTR : TEMPLATE=%s\n",
 836                                 query_uuid->bv_val, 0, 0 );
 837
 838                         op->orm_modlist = &mod;
 839
 840                         op->o_bd->be_modify( op, &sreply );
 841                 }
 842                 op->o_tmpfree( qi->xdn.bv_val, op->o_tmpmemctx );
 843                 op->o_tmpfree( qi, op->o_tmpmemctx );
 844         }
 845         return deleted;
 846 }
 847
 848 static int
 849 get_attr_set(
 850         AttributeName* attrs,
 851         query_manager* qm,
 852         int num
 853 );
 854
 855 static int
 856 filter2template(
 857         Operation               *op,
 858         Filter                  *f,
 859         struct                  berval *fstr,
 860         AttributeName**         filter_attrs,
 861         int*                    filter_cnt,
 862         int*                    filter_got_oc )
 863 {
 864         AttributeDescription *ad;
 865
 866         switch ( f->f_choice ) {
 867         case LDAP_FILTER_EQUALITY:
 868                 ad = f->f_av_desc;
 869                 sprintf( fstr->bv_val+fstr->bv_len, "(%s=)", ad->ad_cname.bv_val );
 870                 fstr->bv_len += ad->ad_cname.bv_len + ( sizeof("(=)") - 1 );
 871                 break;
 872
 873         case LDAP_FILTER_GE:
 874                 ad = f->f_av_desc;
 875                 sprintf( fstr->bv_val+fstr->bv_len, "(%s>=)", ad->ad_cname.bv_val);
 876                 fstr->bv_len += ad->ad_cname.bv_len + ( sizeof("(>=)") - 1 );
 877                 break;
 878
 879         case LDAP_FILTER_LE:
 880                 ad = f->f_av_desc;
 881                 sprintf( fstr->bv_val+fstr->bv_len, "(%s<=)", ad->ad_cname.bv_val);
 882                 fstr->bv_len += ad->ad_cname.bv_len + ( sizeof("(<=)") - 1 );
 883                 break;
 884
 885         case LDAP_FILTER_APPROX:
 886                 ad = f->f_av_desc;
 887                 sprintf( fstr->bv_val+fstr->bv_len, "(%s~=)", ad->ad_cname.bv_val);
 888                 fstr->bv_len += ad->ad_cname.bv_len + ( sizeof("(~=)") - 1 );
 889                 break;
 890
 891         case LDAP_FILTER_SUBSTRINGS:
 892                 ad = f->f_sub_desc;
 893                 sprintf( fstr->bv_val+fstr->bv_len, "(%s=)", ad->ad_cname.bv_val );
 894                 fstr->bv_len += ad->ad_cname.bv_len + ( sizeof("(=)") - 1 );
 895                 break;
 896
 897         case LDAP_FILTER_PRESENT:
 898                 ad = f->f_desc;
 899                 sprintf( fstr->bv_val+fstr->bv_len, "(%s=*)", ad->ad_cname.bv_val );
 900                 fstr->bv_len += ad->ad_cname.bv_len + ( sizeof("(=*)") - 1 );
 901                 break;
 902
 903         case LDAP_FILTER_AND:
 904         case LDAP_FILTER_OR:
 905         case LDAP_FILTER_NOT: {
 906                 int rc = 0;
 907                 sprintf( fstr->bv_val+fstr->bv_len, "(%c",
 908                         f->f_choice == LDAP_FILTER_AND ? '&' :
 909                         f->f_choice == LDAP_FILTER_OR ? '|' : '!' );
 910                 fstr->bv_len += sizeof("(%") - 1;
 911
 912                 for ( f = f->f_list; f != NULL; f = f->f_next ) {
 913                         rc = filter2template( op, f, fstr, filter_attrs, filter_cnt,
 914                                 filter_got_oc );
 915                         if ( rc ) break;
 916                 }
 917                 sprintf( fstr->bv_val+fstr->bv_len, ")" );
 918                 fstr->bv_len += sizeof(")") - 1;
 919
 920                 return rc;
 921                 }
 922
 923         default:
 924                 strcpy( fstr->bv_val, "(?=?)" );
 925                 fstr->bv_len += sizeof("(?=?)")-1;
 926                 return -1;
 927         }
 928
 929         *filter_attrs = (AttributeName *)op->o_tmprealloc(*filter_attrs,
 930                                 (*filter_cnt + 2)*sizeof(AttributeName), op->o_tmpmemctx);
 931
 932         (*filter_attrs)[*filter_cnt].an_desc = ad;
 933         (*filter_attrs)[*filter_cnt].an_name = ad->ad_cname;
 934         (*filter_attrs)[*filter_cnt].an_oc = NULL;
 935         (*filter_attrs)[*filter_cnt].an_oc_exclude = 0;
 936         BER_BVZERO( &(*filter_attrs)[*filter_cnt+1].an_name );
 937         (*filter_cnt)++;
 938         if ( ad == slap_schema.si_ad_objectClass )
 939                 *filter_got_oc = 1;
 940         return 0;
 941 }
 942
 943 struct search_info {
 944         slap_overinst *on;
 945         Query query;
 946         int template_id;
 947         int max;
 948         int over;
 949         int count;
 950         Entry *head, *tail;
 951 };
 952
 953 static int
 954 cache_entries(
 955         Operation       *op,
 956         SlapReply       *rs,
 957         struct berval *query_uuid)
 958 {
 959         struct search_info *si = op->o_callback->sc_private;
 960         slap_overinst *on = si->on;
 961         cache_manager *cm = on->on_bi.bi_private;
 962         query_manager*          qm = cm->qm;
 963         int             return_val = 0;
 964         Entry           *e;
 965         struct berval   crp_uuid;
 966         char            uuidbuf[ LDAP_LUTIL_UUIDSTR_BUFSIZE ];
 967         Operation op_tmp = *op;
 968
 969         query_uuid->bv_len = lutil_uuidstr(uuidbuf, sizeof(uuidbuf));
 970         ber_str2bv(uuidbuf, query_uuid->bv_len, 1, query_uuid);
 971
 972         op_tmp.o_bd = &cm->db;
 973         op_tmp.o_dn = cm->db.be_rootdn;
 974         op_tmp.o_ndn = cm->db.be_rootndn;
 975
 976         Debug( LDAP_DEBUG_TRACE, "UUID for query being added = %s\n",
 977                         uuidbuf, 0, 0 );
 978
 979         for ( e=si->head; e; e=si->head ) {
 980                 si->head = e->e_private;
 981                 e->e_private = NULL;
 982                 Debug( LDAP_DEBUG_NONE, "LOCKING REMOVE MUTEX\n", 0, 0, 0 );
 983                 ldap_pvt_thread_mutex_lock(&cm->remove_mutex);
 984                 Debug( LDAP_DEBUG_NONE, "LOCKED REMOVE MUTEX\n", 0, 0, 0);
 985                 while ( cm->cur_entries > (cm->max_entries) ) {
 986                                 qm->crfunc(qm, &crp_uuid);
 987                                 if (crp_uuid.bv_val) {
 988                                         Debug( LDAP_DEBUG_TRACE,
 989                                                 "Removing query UUID %s\n",
 990                                                 crp_uuid.bv_val, 0, 0 );
 991                                         return_val = remove_query_data(&op_tmp, rs, &crp_uuid);
 992                                         Debug( LDAP_DEBUG_TRACE,
 993                                                 "QUERY REMOVED, SIZE=%d\n",
 994                                                 return_val, 0, 0);
 995                                         ldap_pvt_thread_mutex_lock(
 996                                                         &cm->cache_mutex );
 997                                         cm->cur_entries -= return_val;
 998                                         cm->num_cached_queries--;
 999                                         Debug( LDAP_DEBUG_TRACE,
1000                                                 "STORED QUERIES = %lu\n",
1001                                                 cm->num_cached_queries, 0, 0 );
1002                                         ldap_pvt_thread_mutex_unlock(
1003                                                         &cm->cache_mutex );
1004                                         Debug( LDAP_DEBUG_TRACE,
1005                                                 "QUERY REMOVED, CACHE ="
1006                                                 "%d entries\n",
1007                                                 cm->cur_entries, 0, 0 );
1008                                 }
1009                 }
1010
1011                 return_val = merge_entry(&op_tmp, e, query_uuid);
1012                 ldap_pvt_thread_mutex_unlock(&cm->remove_mutex);
1013                 ldap_pvt_thread_mutex_lock(&cm->cache_mutex);
1014                 cm->cur_entries += return_val;
1015                 Debug( LDAP_DEBUG_TRACE,
1016                         "ENTRY ADDED/MERGED, CACHED ENTRIES=%d\n",
1017                         cm->cur_entries, 0, 0 );
1018                 return_val = 0;
1019                 ldap_pvt_thread_mutex_unlock(&cm->cache_mutex);
1020         }
1021         ldap_pvt_thread_mutex_lock(&cm->cache_mutex);
1022         cm->num_cached_queries++;
1023         Debug( LDAP_DEBUG_TRACE, "STORED QUERIES = %lu\n",
1024                         cm->num_cached_queries, 0, 0 );
1025         ldap_pvt_thread_mutex_unlock(&cm->cache_mutex);
1026
1027         return return_val;
1028 }
1029
1030 static int
1031 pcache_response(
1032         Operation       *op,
1033         SlapReply       *rs )
1034 {
1035         struct search_info *si = op->o_callback->sc_private;
1036         slap_overinst *on = si->on;
1037         cache_manager *cm = on->on_bi.bi_private;
1038         query_manager*          qm = cm->qm;
1039         struct berval uuid;
1040
1041         if ( rs->sr_type == REP_SEARCH ) {
1042                 Entry *e;
1043                 /* If we haven't exceeded the limit for this query,
1044                  * build a chain of answers to store. If we hit the
1045                  * limit, empty the chain and ignore the rest.
1046                  */
1047                 if ( !si->over ) {
1048                         if ( si->count < si->max ) {
1049                                 si->count++;
1050                                 e = entry_dup( rs->sr_entry );
1051                                 if ( !si->head ) si->head = e;
1052                                 if ( si->tail ) si->tail->e_private = e;
1053                                 si->tail = e;
1054                         } else {
1055                                 si->over = 1;
1056                                 si->count = 0;
1057                                 for (;si->head; si->head=e) {
1058                                         e = si->head->e_private;
1059                                         si->head->e_private = NULL;
1060                                         entry_free(si->head);
1061                                 }
1062                                 si->tail = NULL;
1063                         }
1064                 }
1065                 if ( si->query.save_attrs != NULL ) {
1066                         rs->sr_attrs = si->query.save_attrs;
1067                         op->ors_attrs = si->query.save_attrs;
1068                         si->query.save_attrs = NULL;
1069                 }
1070
1071         } else if ( rs->sr_type == REP_RESULT ) {
1072                 if ( si->count && cache_entries( op, rs, &uuid ) == 0 ) {
1073                         qm->addfunc(qm, &si->query, si->template_id, &uuid);
1074                         /* If the consistency checker suspended itself,
1075                          * wake it back up
1076                          */
1077                         if ( cm->cc_paused ) {
1078                                 ldap_pvt_thread_mutex_lock( &slapd_rq.rq_mutex );
1079                                 if ( cm->cc_paused ) {
1080                                         cm->cc_paused = 0;
1081                                         ldap_pvt_runqueue_resched( &slapd_rq, cm->cc_arg, 0 );
1082                                 }
1083                                 ldap_pvt_thread_mutex_unlock( &slapd_rq.rq_mutex );
1084                         }
1085                 } else {
1086                         free( si->query.attrs );
1087                         filter_free( si->query.filter );
1088                 }
1089
1090                 /* free self */
1091                 op->o_callback->sc_cleanup = slap_freeself_cb;
1092         }
1093         return SLAP_CB_CONTINUE;
1094 }
1095
1096 static void
1097 add_filter_attrs(
1098         Operation *op,
1099         AttributeName** new_attrs,
1100         struct attr_set *attrs,
1101         AttributeName* filter_attrs,
1102         int fattr_cnt,
1103         int fattr_got_oc)
1104 {
1105         int alluser = 0;
1106         int allop = 0;
1107         int i, j;
1108         int count;
1109         int addoc = 0;
1110
1111         /* duplicate attrs */
1112         count = attrs->count + fattr_cnt;
1113         if ( !fattr_got_oc && !(attrs->flags & PC_GOT_OC)) {
1114                 addoc = 1;
1115                 count++;
1116         }
1117
1118         *new_attrs = (AttributeName*)ch_malloc((count+1)*
1119                 sizeof(AttributeName));
1120         for (i=0; i<attrs->count; i++) {
1121                 (*new_attrs)[i].an_name = attrs->attrs[i].an_name;
1122                 (*new_attrs)[i].an_desc = attrs->attrs[i].an_desc;
1123         }
1124         BER_BVZERO( &(*new_attrs)[i].an_name );
1125         alluser = an_find(*new_attrs, &AllUser);
1126         allop = an_find(*new_attrs, &AllOper);
1127
1128         j = i;
1129         for ( i=0; i<fattr_cnt; i++ ) {
1130                 if ( an_find(*new_attrs, &filter_attrs[i].an_name ))
1131                         continue;
1132                 if ( is_at_operational(filter_attrs[i].an_desc->ad_type) ) {
1133                         if (allop)
1134                                 continue;
1135                 } else if (alluser)
1136                         continue;
1137                 (*new_attrs)[j].an_name = filter_attrs[i].an_name;
1138                 (*new_attrs)[j].an_desc = filter_attrs[i].an_desc;
1139                 (*new_attrs)[j].an_oc = NULL;
1140                 (*new_attrs)[j].an_oc_exclude = 0;
1141                 j++;
1142         }
1143         if ( addoc ) {
1144                 (*new_attrs)[j].an_name = slap_schema.si_ad_objectClass->ad_cname;
1145                 (*new_attrs)[j].an_desc = slap_schema.si_ad_objectClass;
1146                 (*new_attrs)[j].an_oc = NULL;
1147                 (*new_attrs)[j].an_oc_exclude = 0;
1148                 j++;
1149         }
1150         BER_BVZERO( &(*new_attrs)[j].an_name );
1151 }
1152
1153 /* NOTE: this is a quick workaround to let pcache minimally interact
1154  * with pagedResults.  A more articulated solutions would be to
1155  * perform the remote query without control and cache all results,
1156  * performing the pagedResults search only within the client
1157  * and the proxy.  This requires pcache to understand pagedResults. */
1158 static int
1159 pcache_chk_controls(
1160         Operation       *op,
1161         SlapReply       *rs )
1162 {
1163         const char      *non = "";
1164         const char      *stripped = "";
1165
1166         switch( op->o_pagedresults ) {
1167         case SLAP_CONTROL_NONCRITICAL:
1168                 non = "non-";
1169                 stripped = "; stripped";
1170                 /* fallthru */
1171
1172         case SLAP_CONTROL_CRITICAL:
1173                 Debug( LDAP_DEBUG_TRACE, "%s: "
1174                         "%scritical pagedResults control "
1175                         "disabled with proxy cache%s.\n",
1176                         op->o_log_prefix, non, stripped );
1177
1178                 slap_remove_control( op, rs, slap_cids.sc_pagedResults, NULL );
1179                 break;
1180
1181         default:
1182                 rs->sr_err = SLAP_CB_CONTINUE;
1183                 break;
1184         }
1185
1186         return rs->sr_err;
1187 }
1188
1189 static int
1190 pcache_op_search(
1191         Operation       *op,
1192         SlapReply       *rs )
1193 {
1194         slap_overinst *on = (slap_overinst *)op->o_bd->bd_info;
1195         cache_manager *cm = on->on_bi.bi_private;
1196         query_manager*          qm = cm->qm;
1197
1198         int count;
1199
1200         int i = -1;
1201
1202         AttributeName   *filter_attrs = NULL;
1203
1204         Query           query;
1205
1206         int             attr_set = -1;
1207         int             template_id = -1;
1208         int             answerable = 0;
1209         int             cacheable = 0;
1210         int             fattr_cnt=0;
1211         int             fattr_got_oc = 0;
1212         int             oc_attr_absent = 1;
1213
1214         struct berval tempstr;
1215
1216         tempstr.bv_val = op->o_tmpalloc( op->ors_filterstr.bv_len+1, op->o_tmpmemctx );
1217         tempstr.bv_len = 0;
1218         if ( filter2template( op, op->ors_filter, &tempstr, &filter_attrs,
1219                 &fattr_cnt, &fattr_got_oc )) {
1220                 op->o_tmpfree( tempstr.bv_val, op->o_tmpmemctx );
1221                 return SLAP_CB_CONTINUE;
1222         }
1223
1224         Debug( LDAP_DEBUG_TRACE, "query template of incoming query = %s\n",
1225                                         tempstr.bv_val, 0, 0 );
1226
1227         /* FIXME: cannot cache/answer requests with pagedResults control */
1228
1229
1230         /* find attr set */
1231         attr_set = get_attr_set(op->ors_attrs, qm, cm->numattrsets);
1232
1233         query.filter = op->ors_filter;
1234         query.attrs = op->ors_attrs;
1235         query.save_attrs = NULL;
1236         query.base = op->o_req_ndn;
1237         query.scope = op->ors_scope;
1238
1239         /* check for query containment */
1240         if (attr_set > -1) {
1241                 QueryTemplate *qt = qm->templates;
1242                 for (i=0; i<cm->numtemplates; i++, qt++) {
1243                         /* find if template i can potentially answer tempstr */
1244                         if ( qt->attr_set_index != attr_set ||
1245                                 qt->querystr.bv_len != tempstr.bv_len ||
1246                                 strcasecmp( qt->querystr.bv_val, tempstr.bv_val ))
1247                                 continue;
1248                         cacheable = 1;
1249                         template_id = i;
1250                         Debug( LDAP_DEBUG_NONE, "Entering QC, querystr = %s\n",
1251                                         op->ors_filterstr.bv_val, 0, 0 );
1252                         answerable = (*(qm->qcfunc))(op, qm, &query, i);
1253
1254                         if (answerable)
1255                                 break;
1256                 }
1257         }
1258         op->o_tmpfree( tempstr.bv_val, op->o_tmpmemctx );
1259
1260         query.save_attrs = op->ors_attrs;
1261         query.attrs = NULL;
1262
1263         if (answerable) {
1264                 /* Need to clear the callbacks of the original operation,
1265                  * in case there are other overlays */
1266                 BackendDB       *save_bd = op->o_bd;
1267                 slap_callback   *save_cb = op->o_callback;
1268
1269                 Debug( LDAP_DEBUG_TRACE, "QUERY ANSWERABLE\n", 0, 0, 0 );
1270                 op->o_tmpfree( filter_attrs, op->o_tmpmemctx );
1271                 ldap_pvt_thread_rdwr_runlock(&qm->templates[i].t_rwlock);
1272                 op->o_bd = &cm->db;
1273                 op->o_callback = NULL;
1274                 i = cm->db.bd_info->bi_op_search( op, rs );
1275                 op->o_bd = save_bd;
1276                 op->o_callback = save_cb;
1277                 return i;
1278         }
1279
1280         Debug( LDAP_DEBUG_TRACE, "QUERY NOT ANSWERABLE\n", 0, 0, 0 );
1281
1282         ldap_pvt_thread_mutex_lock(&cm->cache_mutex);
1283         if (cm->num_cached_queries >= cm->max_queries) {
1284                 cacheable = 0;
1285         }
1286         ldap_pvt_thread_mutex_unlock(&cm->cache_mutex);
1287
1288         if (cacheable) {
1289                 slap_callback           *cb;
1290                 struct search_info      *si;
1291
1292                 Debug( LDAP_DEBUG_TRACE, "QUERY CACHEABLE\n", 0, 0, 0 );
1293                 query.filter = str2filter(op->ors_filterstr.bv_val);
1294                 add_filter_attrs(op, &query.attrs, &qm->attr_sets[attr_set],
1295                         filter_attrs, fattr_cnt, fattr_got_oc);
1296
1297                 op->ors_attrs = query.attrs;
1298
1299                 cb = op->o_tmpalloc( sizeof(*cb) + sizeof(*si), op->o_tmpmemctx);
1300                 cb->sc_response = pcache_response;
1301                 cb->sc_cleanup = NULL;
1302                 cb->sc_private = (cb+1);
1303                 si = cb->sc_private;
1304                 si->on = on;
1305                 si->query = query;
1306                 si->template_id = template_id;
1307                 si->max = cm->num_entries_limit ;
1308                 si->over = 0;
1309                 si->count = 0;
1310                 si->head = NULL;
1311                 si->tail = NULL;
1312
1313                 if ( cm->response_cb == PCACHE_RESPONSE_CB_HEAD ) {
1314                         cb->sc_next = op->o_callback;
1315                         op->o_callback = cb;
1316
1317                 } else {
1318                         slap_callback           **pcb;
1319
1320                         /* need to move the callback at the end, in case other
1321                          * overlays are present, so that the final entry is
1322                          * actually cached */
1323                         cb->sc_next = NULL;
1324                         for ( pcb = &op->o_callback; *pcb; pcb = &(*pcb)->sc_next );
1325                         *pcb = cb;
1326                 }
1327
1328         } else {
1329                 Debug( LDAP_DEBUG_TRACE, "QUERY NOT CACHEABLE\n",
1330                                         0, 0, 0);
1331         }
1332
1333         op->o_tmpfree( filter_attrs, op->o_tmpmemctx );
1334
1335         return SLAP_CB_CONTINUE;
1336 }
1337
1338 static int
1339 get_attr_set(
1340         AttributeName* attrs,
1341         query_manager* qm,
1342         int num )
1343 {
1344         int i;
1345         int count = 0;
1346
1347         if ( attrs ) {
1348                 for ( ; attrs[count].an_name.bv_val; count++ );
1349         }
1350
1351         for (i=0; i<num; i++) {
1352                 AttributeName *a2;
1353                 int found = 1;
1354
1355                 if ( count > qm->attr_sets[i].count )
1356                         continue;
1357                 if ( !count ) {
1358                         if ( !qm->attr_sets[i].count )
1359                                 break;
1360                         continue;
1361                 }
1362                 for ( a2 = attrs; a2->an_name.bv_val; a2++ ) {
1363                         if ( !an_find( qm->attr_sets[i].attrs, &a2->an_name )) {
1364                                 found = 0;
1365                                 break;
1366                         }
1367                 }
1368                 if ( found )
1369                         break;
1370         }
1371         if ( i == num )
1372                 i = -1;
1373         return i;
1374 }
1375
1376 static void*
1377 consistency_check(
1378         void *ctx,
1379         void *arg )
1380 {
1381         struct re_s *rtask = arg;
1382         slap_overinst *on = rtask->arg;
1383         cache_manager *cm = on->on_bi.bi_private;
1384         query_manager *qm = cm->qm;
1385         Connection conn = {0};
1386         OperationBuffer opbuf;
1387         Operation *op;
1388
1389         SlapReply rs = {REP_RESULT};
1390         CachedQuery* query, *query_prev;
1391         int i, return_val, pause = 1;
1392         QueryTemplate* templ;
1393
1394         op = (Operation *) &opbuf;
1395         connection_fake_init( &conn, op, ctx );
1396
1397         op->o_bd = &cm->db;
1398         op->o_dn = cm->db.be_rootdn;
1399         op->o_ndn = cm->db.be_rootndn;
1400
1401         cm->cc_arg = arg;
1402
1403         for (i=0; qm->templates[i].querystr.bv_val; i++) {
1404                 templ = qm->templates + i;
1405                 query = templ->query_last;
1406                 if ( query ) pause = 0;
1407                 op->o_time = slap_get_time();
1408                 ldap_pvt_thread_mutex_lock(&cm->remove_mutex);
1409                 while (query && (query->expiry_time < op->o_time)) {
1410                         ldap_pvt_thread_mutex_lock(&qm->lru_mutex);
1411                         remove_query(qm, query);
1412                         ldap_pvt_thread_mutex_unlock(&qm->lru_mutex);
1413                         Debug( LDAP_DEBUG_TRACE, "Lock CR index = %d\n",
1414                                         i, 0, 0 );
1415                         ldap_pvt_thread_rdwr_wlock(&templ->t_rwlock);
1416                         remove_from_template(query, templ);
1417                         Debug( LDAP_DEBUG_TRACE, "TEMPLATE %d QUERIES-- %d\n",
1418                                         i, templ->no_of_queries, 0 );
1419                         Debug( LDAP_DEBUG_TRACE, "Unlock CR index = %d\n",
1420                                         i, 0, 0 );
1421                         ldap_pvt_thread_rdwr_wunlock(&templ->t_rwlock);
1422                         return_val = remove_query_data(op, &rs, &query->q_uuid);
1423                         Debug( LDAP_DEBUG_TRACE, "STALE QUERY REMOVED, SIZE=%d\n",
1424                                                 return_val, 0, 0 );
1425                         ldap_pvt_thread_mutex_lock(&cm->cache_mutex);
1426                         cm->cur_entries -= return_val;
1427                         cm->num_cached_queries--;
1428                         Debug( LDAP_DEBUG_TRACE, "STORED QUERIES = %lu\n",
1429                                         cm->num_cached_queries, 0, 0 );
1430                         ldap_pvt_thread_mutex_unlock(&cm->cache_mutex);
1431                         Debug( LDAP_DEBUG_TRACE,
1432                                 "STALE QUERY REMOVED, CACHE ="
1433                                 "%d entries\n",
1434                                 cm->cur_entries, 0, 0 );
1435                         query_prev = query;
1436                         query = query->prev;
1437                         free_query(query_prev);
1438                 }
1439                 ldap_pvt_thread_mutex_unlock(&cm->remove_mutex);
1440         }
1441         ldap_pvt_thread_mutex_lock( &slapd_rq.rq_mutex );
1442         if ( ldap_pvt_runqueue_isrunning( &slapd_rq, rtask )) {
1443                 ldap_pvt_runqueue_stoptask( &slapd_rq, rtask );
1444         }
1445         /* If there were no queries, defer processing for a while */
1446         cm->cc_paused = pause;
1447         ldap_pvt_runqueue_resched( &slapd_rq, rtask, pause );
1448
1449         ldap_pvt_thread_mutex_unlock( &slapd_rq.rq_mutex );
1450         return NULL;
1451 }
1452
1453
1454 #define MAX_ATTR_SETS 500
1455
1456 enum {
1457         PC_MAIN = 1,
1458         PC_ATTR,
1459         PC_TEMP,
1460         PC_RESP
1461 };
1462
1463 static ConfigDriver pc_cf_gen;
1464 static ConfigLDAPadd pc_ldadd;
1465 static ConfigCfAdd pc_cfadd;
1466
1467 static ConfigTable pccfg[] = {
1468         { "proxycache", "backend> <max_entries> <numattrsets> <entry limit> "
1469                                 "<cycle_time",
1470                 6, 6, 0, ARG_MAGIC|ARG_NO_DELETE|PC_MAIN, pc_cf_gen,
1471                 "( OLcfgOvAt:2.1 NAME 'olcProxyCache' "
1472                         "DESC 'ProxyCache basic parameters' "
1473                         "SYNTAX OMsDirectoryString SINGLE-VALUE )", NULL, NULL },
1474         { "proxyattrset", "index> <attributes...",
1475                 2, 0, 0, ARG_MAGIC|PC_ATTR, pc_cf_gen,
1476                 "( OLcfgOvAt:2.2 NAME 'olcProxyAttrset' "
1477                         "DESC 'A set of attributes to cache' "
1478                         "SYNTAX OMsDirectoryString )", NULL, NULL },
1479         { "proxytemplate", "filter> <attrset-index> <TTL",
1480                 4, 4, 0, ARG_MAGIC|PC_TEMP, pc_cf_gen,
1481                 "( OLcfgOvAt:2.3 NAME 'olcProxyTemplate' "
1482                         "DESC 'Filter template, attrset, and cache TTL' "
1483                         "SYNTAX OMsDirectoryString )", NULL, NULL },
1484         { "response-callback", "head|tail(default)",
1485                 2, 2, 0, ARG_MAGIC|PC_RESP, pc_cf_gen,
1486                 "( OLcfgOvAt:2.4 NAME 'olcProxyResponseCB' "
1487                         "DESC 'Response callback position in overlay stack' "
1488                         "SYNTAX OMsDirectoryString )", NULL, NULL },
1489         { NULL, NULL, 0, 0, 0, ARG_IGNORED }
1490 };
1491
1492 static ConfigOCs pcocs[] = {
1493         { "( OLcfgOvOc:2.1 "
1494                 "NAME 'olcPcacheConfig' "
1495                 "DESC 'ProxyCache configuration' "
1496                 "SUP olcOverlayConfig "
1497                 "MUST ( olcProxyCache $ olcProxyAttrset $ olcProxyTemplate ) "
1498                 "MAY olcProxyResponseCB )", Cft_Overlay, pccfg, NULL, pc_cfadd },
1499         { "( OLcfgOvOc:2.2 "
1500                 "NAME 'olcPcacheDatabase' "
1501                 "DESC 'Cache database configuration' "
1502                 "AUXILIARY )", Cft_Misc, pccfg, pc_ldadd },
1503         { NULL, 0, NULL }
1504 };
1505
1506 static int
1507 pc_ldadd( CfEntryInfo *p, Entry *e, ConfigArgs *ca )
1508 {
1509         slap_overinst *on;
1510         cache_manager *cm;
1511
1512         if ( p->ce_type != Cft_Overlay || !p->ce_bi ||
1513                 p->ce_bi->bi_cf_ocs != pcocs )
1514                 return LDAP_CONSTRAINT_VIOLATION;
1515
1516         on = (slap_overinst *)p->ce_bi;
1517         cm = on->on_bi.bi_private;
1518         ca->be = &cm->db;
1519         return LDAP_SUCCESS;
1520 }
1521
1522 static int
1523 pc_cfadd( Operation *op, SlapReply *rs, Entry *p, ConfigArgs *ca )
1524 {
1525         CfEntryInfo *pe = p->e_private;
1526         slap_overinst *on = (slap_overinst *)pe->ce_bi;
1527         cache_manager *cm = on->on_bi.bi_private;
1528         struct berval bv;
1529
1530         /* FIXME: should not hardcode "olcDatabase" here */
1531         bv.bv_len = sprintf( ca->msg, "olcDatabase=%s", cm->db.bd_info->bi_type );
1532         bv.bv_val = ca->msg;
1533         ca->be = &cm->db;
1534
1535         /* We can only create this entry if the database is table-driven
1536          */
1537         if ( cm->db.bd_info->bi_cf_ocs )
1538                 config_build_entry( op, rs, pe, ca, &bv, cm->db.bd_info->bi_cf_ocs,
1539                         &pcocs[1] );
1540
1541         return 0;
1542 }
1543
1544 static int
1545 pc_cf_gen( ConfigArgs *c )
1546 {
1547         slap_overinst   *on = (slap_overinst *)c->bi;
1548         cache_manager*  cm = on->on_bi.bi_private;
1549         query_manager*  qm = cm->qm;
1550         QueryTemplate*  temp;
1551         AttributeName*  attr_name;
1552         AttributeName*  attrarray;
1553         const char*     text=NULL;
1554         int             i, num, rc = 0;
1555         char            *ptr;
1556         unsigned long   t;
1557
1558         if ( c->op == SLAP_CONFIG_EMIT ) {
1559                 struct berval bv;
1560                 switch( c->type ) {
1561                 case PC_MAIN:
1562                         bv.bv_len = snprintf( c->msg, sizeof( c->msg ), "%s %d %d %d %ld",
1563                                 cm->db.bd_info->bi_type, cm->max_entries, cm->numattrsets,
1564                                 cm->num_entries_limit, cm->cc_period );
1565                         bv.bv_val = c->msg;
1566                         value_add_one( &c->rvalue_vals, &bv );
1567                         break;
1568                 case PC_ATTR:
1569                         for (i=0; i<cm->numattrsets; i++) {
1570                                 if ( !qm->attr_sets[i].count ) continue;
1571
1572                                 bv.bv_len = snprintf( c->msg, sizeof( c->msg ), "%d", i );
1573
1574                                 /* count the attr length */
1575                                 for ( attr_name = qm->attr_sets[i].attrs;
1576                                         attr_name->an_name.bv_val; attr_name++ )
1577                                         bv.bv_len += attr_name->an_name.bv_len + 1;
1578
1579                                 bv.bv_val = ch_malloc( bv.bv_len+1 );
1580                                 ptr = lutil_strcopy( bv.bv_val, c->msg );
1581                                 for ( attr_name = qm->attr_sets[i].attrs;
1582                                         attr_name->an_name.bv_val; attr_name++ ) {
1583                                         *ptr++ = ' ';
1584                                         ptr = lutil_strcopy( ptr, attr_name->an_name.bv_val );
1585                                 }
1586                                 ber_bvarray_add( &c->rvalue_vals, &bv );
1587                         }
1588                         if ( !c->rvalue_vals )
1589                                 rc = 1;
1590                         break;
1591                 case PC_TEMP:
1592                         for (i=0; i<cm->numtemplates; i++) {
1593                                 bv.bv_len = snprintf( c->msg, sizeof( c->msg ), " %d %ld",
1594                                         qm->templates[i].attr_set_index,
1595                                         qm->templates[i].ttl );
1596                                 bv.bv_len += qm->templates[i].querystr.bv_len + 2;
1597                                 bv.bv_val = ch_malloc( bv.bv_len+1 );
1598                                 ptr = bv.bv_val;
1599                                 *ptr++ = '"';
1600                                 ptr = lutil_strcopy( ptr, qm->templates[i].querystr.bv_val );
1601                                 *ptr++ = '"';
1602                                 strcpy( ptr, c->msg );
1603                                 ber_bvarray_add( &c->rvalue_vals, &bv );
1604                         }
1605                         if ( !c->rvalue_vals )
1606                                 rc = 1;
1607                         break;
1608                 case PC_RESP:
1609                         if ( cm->response_cb == PCACHE_RESPONSE_CB_HEAD ) {
1610                                 BER_BVSTR( &bv, "head" );
1611                         } else {
1612                                 BER_BVSTR( &bv, "tail" );
1613                         }
1614                         value_add_one( &c->rvalue_vals, &bv );
1615                         break;
1616                 }
1617                 return rc;
1618         } else if ( c->op == LDAP_MOD_DELETE ) {
1619                 return 1;       /* FIXME */
1620 #if 0
1621                 switch( c->type ) {
1622                 case PC_ATTR:
1623                 case PC_TEMP:
1624                 }
1625                 return rc;
1626 #endif
1627         }
1628
1629         switch( c->type ) {
1630         case PC_MAIN:
1631                 if ( cm->numattrsets > 0 ) {
1632                         snprintf( c->msg, sizeof( c->msg ), "\"proxycache\" directive already provided" );
1633                         Debug( LDAP_DEBUG_CONFIG, "%s: %s.\n", c->log, c->msg, 0 );
1634                         return( 1 );
1635                 }
1636
1637                 if ( lutil_atoi( &cm->numattrsets, c->argv[3] ) != 0 ) {
1638                         snprintf( c->msg, sizeof( c->msg ), "unable to parse num attrsets=\"%s\" (arg #3)",
1639                                 c->argv[3] );
1640                         Debug( LDAP_DEBUG_CONFIG, "%s: %s.\n", c->log, c->msg, 0 );
1641                         return( 1 );
1642                 }
1643                 if ( cm->numattrsets <= 0 ) {
1644                         snprintf( c->msg, sizeof( c->msg ), "numattrsets (arg #3) must be positive" );
1645                         Debug( LDAP_DEBUG_CONFIG, "%s: %s.\n", c->log, c->msg, 0 );
1646                         return( 1 );
1647                 }
1648                 if ( cm->numattrsets > MAX_ATTR_SETS ) {
1649                         snprintf( c->msg, sizeof( c->msg ), "numattrsets (arg #3) must be <= %d", MAX_ATTR_SETS );
1650                         Debug( LDAP_DEBUG_CONFIG, "%s: %s.\n", c->log, c->msg, 0 );
1651                         return( 1 );
1652                 }
1653
1654                 if ( !backend_db_init( c->argv[1], &cm->db )) {
1655                         snprintf( c->msg, sizeof( c->msg ), "unknown backend type (arg #1)" );
1656                         Debug( LDAP_DEBUG_CONFIG, "%s: %s.\n", c->log, c->msg, 0 );
1657                         return( 1 );
1658                 }
1659
1660                 if ( lutil_atoi( &cm->max_entries, c->argv[2] ) != 0 ) {
1661                         snprintf( c->msg, sizeof( c->msg ), "unable to parse max entries=\"%s\" (arg #2)",
1662                                 c->argv[2] );
1663                         Debug( LDAP_DEBUG_CONFIG, "%s: %s.\n", c->log, c->msg, 0 );
1664                         return( 1 );
1665                 }
1666                 if ( cm->max_entries <= 0 ) {
1667                         snprintf( c->msg, sizeof( c->msg ), "max entries (arg #2) must be positive.\n" );
1668                         Debug( LDAP_DEBUG_CONFIG, "%s: %s\n", c->log, c->msg, 0 );
1669                         return( 1 );
1670                 }
1671
1672                 if ( lutil_atoi( &cm->num_entries_limit, c->argv[4] ) != 0 ) {
1673                         snprintf( c->msg, sizeof( c->msg ), "unable to parse entry limit=\"%s\" (arg #4)",
1674                                 c->argv[4] );
1675                         Debug( LDAP_DEBUG_CONFIG, "%s: %s.\n", c->log, c->msg, 0 );
1676                         return( 1 );
1677                 }
1678                 if ( cm->num_entries_limit <= 0 ) {
1679                         snprintf( c->msg, sizeof( c->msg ), "entry limit (arg #4) must be positive" );
1680                         Debug( LDAP_DEBUG_CONFIG, "%s: %s.\n", c->log, c->msg, 0 );
1681                         return( 1 );
1682                 }
1683                 if ( cm->num_entries_limit > cm->max_entries ) {
1684                         snprintf( c->msg, sizeof( c->msg ), "entry limit (arg #4) must be less than max entries %d (arg #2)", cm->max_entries );
1685                         Debug( LDAP_DEBUG_CONFIG, "%s: %s.\n", c->log, c->msg, 0 );
1686                         return( 1 );
1687                 }
1688
1689                 if ( lutil_parse_time( c->argv[5], &t ) != 0 ) {
1690                         snprintf( c->msg, sizeof( c->msg ), "unable to parse period=\"%s\" (arg #5)",
1691                                 c->argv[5] );
1692                         Debug( LDAP_DEBUG_CONFIG, "%s: %s.\n", c->log, c->msg, 0 );
1693                         return( 1 );
1694                 }
1695                 cm->cc_period = (time_t)t;
1696                 Debug( LDAP_DEBUG_TRACE,
1697                                 "Total # of attribute sets to be cached = %d.\n",
1698                                 cm->numattrsets, 0, 0 );
1699                 qm->attr_sets = ( struct attr_set * )ch_calloc( cm->numattrsets,
1700                                                 sizeof( struct attr_set ) );
1701                 break;
1702         case PC_ATTR:
1703                 if ( cm->numattrsets == 0 ) {
1704                         snprintf( c->msg, sizeof( c->msg ), "\"proxycache\" directive not provided yet" );
1705                         Debug( LDAP_DEBUG_CONFIG, "%s: %s.\n", c->log, c->msg, 0 );
1706                         return( 1 );
1707                 }
1708                 if ( lutil_atoi( &num, c->argv[1] ) != 0 ) {
1709                         snprintf( c->msg, sizeof( c->msg ), "unable to parse attrset #=\"%s\"",
1710                                 c->argv[1] );
1711                         Debug( LDAP_DEBUG_CONFIG, "%s: %s.\n", c->log, c->msg, 0 );
1712                         return( 1 );
1713                 }
1714
1715                 if ( num < 0 || num >= cm->numattrsets ) {
1716                         snprintf( c->msg, sizeof( c->msg ), "attrset index %d out of bounds (must be %s%d)",
1717                                 num, cm->numattrsets > 1 ? "0->" : "", cm->numattrsets - 1 );
1718                         Debug( LDAP_DEBUG_CONFIG, "%s: %s.\n", c->log, c->msg, 0 );
1719                         return 1;
1720                 }
1721                 qm->attr_sets[num].flags |= PC_CONFIGURED;
1722                 if ( c->argc > 2 && strcmp( c->argv[2], "*" ) ) {
1723                         qm->attr_sets[num].count = c->argc - 2;
1724                         qm->attr_sets[num].attrs = (AttributeName*)ch_malloc(
1725                                                 (c->argc-1) * sizeof( AttributeName ));
1726                         attr_name = qm->attr_sets[num].attrs;
1727                         for ( i = 2; i < c->argc; i++ ) {
1728                                 attr_name->an_desc = NULL;
1729                                 if ( slap_str2ad( c->argv[i],
1730                                                 &attr_name->an_desc, &text ) )
1731                                 {
1732                                         strcpy( c->msg, text );
1733                                         Debug( LDAP_DEBUG_CONFIG, "%s: %s.\n", c->log, c->msg, 0 );
1734                                         ch_free( qm->attr_sets[num].attrs );
1735                                         qm->attr_sets[num].attrs = NULL;
1736                                         qm->attr_sets[num].count = 0;
1737                                         return 1;
1738                                 }
1739                                 attr_name->an_name = attr_name->an_desc->ad_cname;
1740                                 attr_name->an_oc = NULL;
1741                                 attr_name->an_oc_exclude = 0;
1742                                 if ( attr_name->an_desc == slap_schema.si_ad_objectClass )
1743                                         qm->attr_sets[num].flags |= PC_GOT_OC;
1744                                 attr_name++;
1745                                 BER_BVZERO( &attr_name->an_name );
1746                         }
1747                 }
1748                 break;
1749         case PC_TEMP:
1750                 if ( cm->numattrsets == 0 ) {
1751                         snprintf( c->msg, sizeof( c->msg ), "\"proxycache\" directive not provided yet" );
1752                         Debug( LDAP_DEBUG_CONFIG, "%s: %s.\n", c->log, c->msg, 0 );
1753                         return( 1 );
1754                 }
1755                 if ( lutil_atoi( &i, c->argv[2] ) != 0 ) {
1756                         snprintf( c->msg, sizeof( c->msg ), "unable to parse template #=\"%s\"",
1757                                 c->argv[2] );
1758                         Debug( LDAP_DEBUG_CONFIG, "%s: %s.\n", c->log, c->msg, 0 );
1759                         return( 1 );
1760                 }
1761
1762                 if ( i < 0 || i >= cm->numattrsets ) {
1763                         snprintf( c->msg, sizeof( c->msg ), "template index %d invalid (%s%d)",
1764                                 i, cm->numattrsets > 1 ? "0->" : "", cm->numattrsets - 1 );
1765                         Debug( LDAP_DEBUG_CONFIG, "%s: %s.\n", c->log, c->msg, 0 );
1766                         return 1;
1767                 }
1768                 num = cm->numtemplates;
1769                 qm->templates = ( QueryTemplate* )ch_realloc( qm->templates,
1770                                 ( num + 2 ) * sizeof( QueryTemplate ));
1771                 temp = qm->templates + num;
1772                 ldap_pvt_thread_rdwr_init( &temp->t_rwlock );
1773                 temp->query = temp->query_last = NULL;
1774                 if ( lutil_parse_time( c->argv[3], &t ) != 0 ) {
1775                         snprintf( c->msg, sizeof( c->msg ), "unable to parse template ttl=\"%s\"",
1776                                 c->argv[3] );
1777                         Debug( LDAP_DEBUG_CONFIG, "%s: %s.\n", c->log, c->msg, 0 );
1778                         return( 1 );
1779                 }
1780                 temp->ttl = (time_t)t;
1781
1782                 temp->no_of_queries = 0;
1783
1784                 ber_str2bv( c->argv[1], 0, 1, &temp->querystr );
1785                 Debug( LDAP_DEBUG_TRACE, "Template:\n", 0, 0, 0 );
1786                 Debug( LDAP_DEBUG_TRACE, "  query template: %s\n",
1787                                 temp->querystr.bv_val, 0, 0 );
1788                 temp->attr_set_index = i;
1789                 qm->attr_sets[i].flags |= PC_REFERENCED;
1790                 Debug( LDAP_DEBUG_TRACE, "  attributes: \n", 0, 0, 0 );
1791                 if ( ( attrarray = qm->attr_sets[i].attrs ) != NULL ) {
1792                         for ( i=0; attrarray[i].an_name.bv_val; i++ )
1793                                 Debug( LDAP_DEBUG_TRACE, "\t%s\n",
1794                                         attrarray[i].an_name.bv_val, 0, 0 );
1795                 }
1796                 temp++;
1797                 temp->querystr.bv_val = NULL;
1798                 cm->numtemplates++;
1799                 break;
1800         case PC_RESP:
1801                 if ( strcasecmp( c->argv[1], "head" ) == 0 ) {
1802                         cm->response_cb = PCACHE_RESPONSE_CB_HEAD;
1803
1804                 } else if ( strcasecmp( c->argv[1], "tail" ) == 0 ) {
1805                         cm->response_cb = PCACHE_RESPONSE_CB_TAIL;
1806
1807                 } else {
1808                         snprintf( c->msg, sizeof( c->msg ), "unknown specifier" );
1809                         Debug( LDAP_DEBUG_CONFIG, "%s: %s.\n", c->log, c->msg, 0 );
1810                         return 1;
1811                 }
1812                 break;
1813         }
1814         return rc;
1815 }
1816
1817 static int
1818 pcache_db_config(
1819         BackendDB       *be,
1820         const char      *fname,
1821         int             lineno,
1822         int             argc,
1823         char            **argv
1824 )
1825 {
1826         slap_overinst   *on = (slap_overinst *)be->bd_info;
1827         cache_manager*  cm = on->on_bi.bi_private;
1828
1829         /* Something for the cache database? */
1830         if ( cm->db.bd_info && cm->db.bd_info->bi_db_config )
1831                 return cm->db.bd_info->bi_db_config( &cm->db, fname, lineno,
1832                         argc, argv );
1833         return SLAP_CONF_UNKNOWN;
1834 }
1835
1836 static int
1837 pcache_db_init(
1838         BackendDB *be
1839 )
1840 {
1841         slap_overinst *on = (slap_overinst *)be->bd_info;
1842         cache_manager *cm;
1843         query_manager *qm;
1844
1845         cm = (cache_manager *)ch_malloc(sizeof(cache_manager));
1846         on->on_bi.bi_private = cm;
1847
1848         qm = (query_manager*)ch_malloc(sizeof(query_manager));
1849
1850         cm->db = *be;
1851         SLAP_DBFLAGS(&cm->db) |= SLAP_DBFLAG_NO_SCHEMA_CHECK;
1852         cm->db.be_private = NULL;
1853         cm->db.be_pcl_mutexp = &cm->db.be_pcl_mutex;
1854         cm->qm = qm;
1855         cm->numattrsets = 0;
1856         cm->numtemplates = 0;
1857         cm->num_entries_limit = 5;
1858         cm->num_cached_queries = 0;
1859         cm->max_entries = 0;
1860         cm->cur_entries = 0;
1861         cm->max_queries = 10000;
1862         cm->response_cb = PCACHE_RESPONSE_CB_TAIL;
1863         cm->cc_period = 1000;
1864         cm->cc_paused = 0;
1865
1866         qm->attr_sets = NULL;
1867         qm->templates = NULL;
1868         qm->lru_top = NULL;
1869         qm->lru_bottom = NULL;
1870
1871         qm->qcfunc = query_containment;
1872         qm->crfunc = cache_replacement;
1873         qm->addfunc = add_query;
1874         ldap_pvt_thread_mutex_init(&qm->lru_mutex);
1875
1876         ldap_pvt_thread_mutex_init(&cm->cache_mutex);
1877         ldap_pvt_thread_mutex_init(&cm->remove_mutex);
1878         return 0;
1879 }
1880
1881 static int
1882 pcache_db_open(
1883         BackendDB *be
1884 )
1885 {
1886         slap_overinst   *on = (slap_overinst *)be->bd_info;
1887         cache_manager   *cm = on->on_bi.bi_private;
1888         query_manager*  qm = cm->qm;
1889         int             i, ncf = 0, rf = 0, nrf = 0, rc = 0;
1890
1891         /* check attr sets */
1892         for ( i = 0; i < cm->numattrsets; i++) {
1893                 if ( !( qm->attr_sets[i].flags & PC_CONFIGURED ) ) {
1894                         if ( qm->attr_sets[i].flags & PC_REFERENCED ) {
1895                                 Debug( LDAP_DEBUG_CONFIG, "pcache: attr set #%d not configured but referenced.\n", i, 0, 0 );
1896                                 rf++;
1897
1898                         } else {
1899                                 Debug( LDAP_DEBUG_CONFIG, "pcache: warning, attr set #%d not configured.\n", i, 0, 0 );
1900                         }
1901                         ncf++;
1902
1903                 } else if ( !( qm->attr_sets[i].flags & PC_REFERENCED ) ) {
1904                         Debug( LDAP_DEBUG_CONFIG, "pcache: attr set #%d configured but not referenced.\n", i, 0, 0 );
1905                         nrf++;
1906                 }
1907         }
1908
1909         if ( ncf || rf || nrf ) {
1910                 Debug( LDAP_DEBUG_CONFIG, "pcache: warning, %d attr sets configured but not referenced.\n", nrf, 0, 0 );
1911                 Debug( LDAP_DEBUG_CONFIG, "pcache: warning, %d attr sets not configured.\n", ncf, 0, 0 );
1912                 Debug( LDAP_DEBUG_CONFIG, "pcache: %d attr sets not configured but referenced.\n", rf, 0, 0 );
1913
1914                 if ( rf > 0 ) {
1915                         return 1;
1916                 }
1917         }
1918
1919         /* need to inherit something from the original database... */
1920         cm->db.be_def_limit = be->be_def_limit;
1921         cm->db.be_limits = be->be_limits;
1922         cm->db.be_acl = be->be_acl;
1923         cm->db.be_dfltaccess = be->be_dfltaccess;
1924
1925         rc = backend_startup_one( &cm->db );
1926
1927         /* There is no runqueue in TOOL mode */
1928         if ( slapMode & SLAP_SERVER_MODE ) {
1929                 ldap_pvt_thread_mutex_lock( &slapd_rq.rq_mutex );
1930                 ldap_pvt_runqueue_insert( &slapd_rq, cm->cc_period,
1931                         consistency_check, on,
1932                         "pcache_consistency", be->be_suffix[0].bv_val );
1933                 ldap_pvt_thread_mutex_unlock( &slapd_rq.rq_mutex );
1934
1935                 /* Cached database must have the rootdn */
1936                 if ( BER_BVISNULL( &cm->db.be_rootndn )
1937                                 || BER_BVISEMPTY( &cm->db.be_rootndn ) )
1938                 {
1939                         Debug( LDAP_DEBUG_ANY, "pcache_db_open(): "
1940                                 "underlying database of type \"%s\"\n"
1941                                 "    serving naming context \"%s\"\n"
1942                                 "    has no \"rootdn\", required by \"proxycache\".\n",
1943                                 on->on_info->oi_orig->bi_type,
1944                                 cm->db.be_suffix[0].bv_val, 0 );
1945                         return 1;
1946                 }
1947         }
1948
1949         return rc;
1950 }
1951
1952 static int
1953 pcache_db_close(
1954         BackendDB *be
1955 )
1956 {
1957         slap_overinst *on = (slap_overinst *)be->bd_info;
1958         cache_manager *cm = on->on_bi.bi_private;
1959         query_manager *qm = cm->qm;
1960         int i, j, rc = 0;
1961
1962         /* cleanup stuff inherited from the original database... */
1963         cm->db.be_limits = NULL;
1964         cm->db.be_acl = NULL;
1965
1966         if ( cm->db.bd_info->bi_db_close ) {
1967                 rc = cm->db.bd_info->bi_db_close( &cm->db );
1968         }
1969         for ( i=0; i<cm->numtemplates; i++ ) {
1970                 CachedQuery *qc, *qn;
1971                 for ( qc = qm->templates[i].query; qc; qc = qn ) {
1972                         qn = qc->next;
1973                         free_query( qc );
1974                 }
1975                 free( qm->templates[i].querystr.bv_val );
1976                 ldap_pvt_thread_rdwr_destroy( &qm->templates[i].t_rwlock );
1977         }
1978         free( qm->templates );
1979         qm->templates = NULL;
1980
1981         for ( i=0; i<cm->numattrsets; i++ ) {
1982                 free( qm->attr_sets[i].attrs );
1983         }
1984         free( qm->attr_sets );
1985         qm->attr_sets = NULL;
1986
1987         return rc;
1988 }
1989
1990 static int
1991 pcache_db_destroy(
1992         BackendDB *be
1993 )
1994 {
1995         slap_overinst *on = (slap_overinst *)be->bd_info;
1996         cache_manager *cm = on->on_bi.bi_private;
1997         query_manager *qm = cm->qm;
1998
1999         /* cleanup stuff inherited from the original database... */
2000         cm->db.be_suffix = NULL;
2001         cm->db.be_nsuffix = NULL;
2002         BER_BVZERO( &cm->db.be_rootdn );
2003         BER_BVZERO( &cm->db.be_rootndn );
2004         BER_BVZERO( &cm->db.be_rootpw );
2005         /* FIXME: there might be more... */
2006
2007         if ( cm->db.be_private != NULL ) {
2008                 backend_destroy_one( &cm->db, 0 );
2009         }
2010
2011         ldap_pvt_thread_mutex_destroy( &qm->lru_mutex );
2012         ldap_pvt_thread_mutex_destroy( &cm->cache_mutex );
2013         ldap_pvt_thread_mutex_destroy( &cm->remove_mutex );
2014         free( qm );
2015         free( cm );
2016
2017         return 0;
2018 }
2019
2020 static slap_overinst pcache;
2021
2022 int pcache_initialize()
2023 {
2024         LDAPAttributeType *at;
2025         int code;
2026         const char *err;
2027
2028         at = ldap_str2attributetype( queryid_schema, &code, &err,
2029                 LDAP_SCHEMA_ALLOW_ALL );
2030         if ( !at ) {
2031                 Debug( LDAP_DEBUG_ANY,
2032                         "pcache_initialize: ldap_str2attributetype failed %s %s\n",
2033                         ldap_scherr2str(code), err, 0 );
2034                 return code;
2035         }
2036         code = at_add( at, 0, NULL, &err );
2037         if ( !code ) {
2038                 slap_str2ad( at->at_names[0], &ad_queryid, &err );
2039         }
2040         ldap_memfree( at );
2041         if ( code ) {
2042                 Debug( LDAP_DEBUG_ANY,
2043                         "pcache_initialize: at_add failed %s %s\n",
2044                         scherr2str(code), err, 0 );
2045                 return code;
2046         }
2047
2048         pcache.on_bi.bi_type = "pcache";
2049         pcache.on_bi.bi_db_init = pcache_db_init;
2050         pcache.on_bi.bi_db_config = pcache_db_config;
2051         pcache.on_bi.bi_db_open = pcache_db_open;
2052         pcache.on_bi.bi_db_close = pcache_db_close;
2053         pcache.on_bi.bi_db_destroy = pcache_db_destroy;
2054
2055         pcache.on_bi.bi_op_search = pcache_op_search;
2056
2057         pcache.on_bi.bi_chk_controls = pcache_chk_controls;
2058
2059         pcache.on_bi.bi_cf_ocs = pcocs;
2060
2061         code = config_register_schema( pccfg, pcocs );
2062         if ( code ) return code;
2063
2064         return overlay_register( &pcache );
2065 }
2066
2067 #if SLAPD_OVER_PROXYCACHE == SLAPD_MOD_DYNAMIC
2068 int init_module(int argc, char *argv[]) {
2069         return pcache_initialize();
2070 }
2071 #endif
2072
2073 #endif  /* defined(SLAPD_OVER_PROXYCACHE) */